core.c 49.2 KB
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/*
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   RFCOMM implementation for Linux Bluetooth stack (BlueZ).
   Copyright (C) 2002 Maxim Krasnyansky <maxk@qualcomm.com>
   Copyright (C) 2002 Marcel Holtmann <marcel@holtmann.org>

   This program is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License version 2 as
   published by the Free Software Foundation;

   THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
   OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
   FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT OF THIRD PARTY RIGHTS.
   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
   WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
   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,
   COPYRIGHTS, TRADEMARKS OR OTHER RIGHTS, RELATING TO USE OF THIS
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   SOFTWARE IS DISCLAIMED.
*/

/*
 * Bluetooth RFCOMM core.
 */

#include <linux/module.h>
#include <linux/errno.h>
#include <linux/kernel.h>
#include <linux/sched.h>
#include <linux/signal.h>
#include <linux/init.h>
#include <linux/wait.h>
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#include <linux/device.h>
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#include <linux/net.h>
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#include <linux/mutex.h>
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#include <linux/kthread.h>
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#include <net/sock.h>
#include <asm/uaccess.h>
#include <asm/unaligned.h>

#include <net/bluetooth/bluetooth.h>
#include <net/bluetooth/hci_core.h>
#include <net/bluetooth/l2cap.h>
#include <net/bluetooth/rfcomm.h>

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#define VERSION "1.11"
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static int disable_cfc = 0;
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static int channel_mtu = -1;
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static unsigned int l2cap_mtu = RFCOMM_MAX_L2CAP_MTU;
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static int l2cap_ertm = 0;
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static struct task_struct *rfcomm_thread;

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static DEFINE_MUTEX(rfcomm_mutex);
#define rfcomm_lock()	mutex_lock(&rfcomm_mutex)
#define rfcomm_unlock()	mutex_unlock(&rfcomm_mutex)
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static unsigned long rfcomm_event;

static LIST_HEAD(session_list);

static int rfcomm_send_frame(struct rfcomm_session *s, u8 *data, int len);
static int rfcomm_send_sabm(struct rfcomm_session *s, u8 dlci);
static int rfcomm_send_disc(struct rfcomm_session *s, u8 dlci);
static int rfcomm_queue_disc(struct rfcomm_dlc *d);
static int rfcomm_send_nsc(struct rfcomm_session *s, int cr, u8 type);
static int rfcomm_send_pn(struct rfcomm_session *s, int cr, struct rfcomm_dlc *d);
static int rfcomm_send_msc(struct rfcomm_session *s, int cr, u8 dlci, u8 v24_sig);
static int rfcomm_send_test(struct rfcomm_session *s, int cr, u8 *pattern, int len);
static int rfcomm_send_credits(struct rfcomm_session *s, u8 addr, u8 credits);
static void rfcomm_make_uih(struct sk_buff *skb, u8 addr);

static void rfcomm_process_connect(struct rfcomm_session *s);

static struct rfcomm_session *rfcomm_session_create(bdaddr_t *src, bdaddr_t *dst, int *err);
static struct rfcomm_session *rfcomm_session_get(bdaddr_t *src, bdaddr_t *dst);
static void rfcomm_session_del(struct rfcomm_session *s);

/* ---- RFCOMM frame parsing macros ---- */
#define __get_dlci(b)     ((b & 0xfc) >> 2)
#define __get_channel(b)  ((b & 0xf8) >> 3)
#define __get_dir(b)      ((b & 0x04) >> 2)
#define __get_type(b)     ((b & 0xef))

#define __test_ea(b)      ((b & 0x01))
#define __test_cr(b)      ((b & 0x02))
#define __test_pf(b)      ((b & 0x10))

#define __addr(cr, dlci)       (((dlci & 0x3f) << 2) | (cr << 1) | 0x01)
#define __ctrl(type, pf)       (((type & 0xef) | (pf << 4)))
#define __dlci(dir, chn)       (((chn & 0x1f) << 1) | dir)
#define __srv_channel(dlci)    (dlci >> 1)
#define __dir(dlci)            (dlci & 0x01)

#define __len8(len)       (((len) << 1) | 1)
#define __len16(len)      ((len) << 1)

/* MCC macros */
#define __mcc_type(cr, type)   (((type << 2) | (cr << 1) | 0x01))
#define __get_mcc_type(b) ((b & 0xfc) >> 2)
#define __get_mcc_len(b)  ((b & 0xfe) >> 1)

/* RPN macros */
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#define __rpn_line_settings(data, stop, parity)  ((data & 0x3) | ((stop & 0x1) << 2) | ((parity & 0x7) << 3))
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#define __get_rpn_data_bits(line) ((line) & 0x3)
#define __get_rpn_stop_bits(line) (((line) >> 2) & 0x1)
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#define __get_rpn_parity(line)    (((line) >> 3) & 0x7)
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static inline void rfcomm_schedule(uint event)
{
	if (!rfcomm_thread)
		return;
	//set_bit(event, &rfcomm_event);
	set_bit(RFCOMM_SCHED_WAKEUP, &rfcomm_event);
	wake_up_process(rfcomm_thread);
}

static inline void rfcomm_session_put(struct rfcomm_session *s)
{
	if (atomic_dec_and_test(&s->refcnt))
		rfcomm_session_del(s);
}

/* ---- RFCOMM FCS computation ---- */

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/* reversed, 8-bit, poly=0x07 */
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static unsigned char rfcomm_crc_table[256] = {
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	0x00, 0x91, 0xe3, 0x72, 0x07, 0x96, 0xe4, 0x75,
	0x0e, 0x9f, 0xed, 0x7c, 0x09, 0x98, 0xea, 0x7b,
	0x1c, 0x8d, 0xff, 0x6e, 0x1b, 0x8a, 0xf8, 0x69,
	0x12, 0x83, 0xf1, 0x60, 0x15, 0x84, 0xf6, 0x67,

	0x38, 0xa9, 0xdb, 0x4a, 0x3f, 0xae, 0xdc, 0x4d,
	0x36, 0xa7, 0xd5, 0x44, 0x31, 0xa0, 0xd2, 0x43,
	0x24, 0xb5, 0xc7, 0x56, 0x23, 0xb2, 0xc0, 0x51,
	0x2a, 0xbb, 0xc9, 0x58, 0x2d, 0xbc, 0xce, 0x5f,

	0x70, 0xe1, 0x93, 0x02, 0x77, 0xe6, 0x94, 0x05,
	0x7e, 0xef, 0x9d, 0x0c, 0x79, 0xe8, 0x9a, 0x0b,
	0x6c, 0xfd, 0x8f, 0x1e, 0x6b, 0xfa, 0x88, 0x19,
	0x62, 0xf3, 0x81, 0x10, 0x65, 0xf4, 0x86, 0x17,

	0x48, 0xd9, 0xab, 0x3a, 0x4f, 0xde, 0xac, 0x3d,
	0x46, 0xd7, 0xa5, 0x34, 0x41, 0xd0, 0xa2, 0x33,
	0x54, 0xc5, 0xb7, 0x26, 0x53, 0xc2, 0xb0, 0x21,
	0x5a, 0xcb, 0xb9, 0x28, 0x5d, 0xcc, 0xbe, 0x2f,

	0xe0, 0x71, 0x03, 0x92, 0xe7, 0x76, 0x04, 0x95,
	0xee, 0x7f, 0x0d, 0x9c, 0xe9, 0x78, 0x0a, 0x9b,
	0xfc, 0x6d, 0x1f, 0x8e, 0xfb, 0x6a, 0x18, 0x89,
	0xf2, 0x63, 0x11, 0x80, 0xf5, 0x64, 0x16, 0x87,

	0xd8, 0x49, 0x3b, 0xaa, 0xdf, 0x4e, 0x3c, 0xad,
	0xd6, 0x47, 0x35, 0xa4, 0xd1, 0x40, 0x32, 0xa3,
	0xc4, 0x55, 0x27, 0xb6, 0xc3, 0x52, 0x20, 0xb1,
	0xca, 0x5b, 0x29, 0xb8, 0xcd, 0x5c, 0x2e, 0xbf,

	0x90, 0x01, 0x73, 0xe2, 0x97, 0x06, 0x74, 0xe5,
	0x9e, 0x0f, 0x7d, 0xec, 0x99, 0x08, 0x7a, 0xeb,
	0x8c, 0x1d, 0x6f, 0xfe, 0x8b, 0x1a, 0x68, 0xf9,
	0x82, 0x13, 0x61, 0xf0, 0x85, 0x14, 0x66, 0xf7,

	0xa8, 0x39, 0x4b, 0xda, 0xaf, 0x3e, 0x4c, 0xdd,
	0xa6, 0x37, 0x45, 0xd4, 0xa1, 0x30, 0x42, 0xd3,
	0xb4, 0x25, 0x57, 0xc6, 0xb3, 0x22, 0x50, 0xc1,
	0xba, 0x2b, 0x59, 0xc8, 0xbd, 0x2c, 0x5e, 0xcf
};

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/* CRC on 2 bytes */
#define __crc(data) (rfcomm_crc_table[rfcomm_crc_table[0xff ^ data[0]] ^ data[1]])

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/* FCS on 2 bytes */
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static inline u8 __fcs(u8 *data)
{
	return (0xff - __crc(data));
}

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/* FCS on 3 bytes */
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static inline u8 __fcs2(u8 *data)
{
	return (0xff - rfcomm_crc_table[__crc(data) ^ data[2]]);
}

/* Check FCS */
static inline int __check_fcs(u8 *data, int type, u8 fcs)
{
	u8 f = __crc(data);

	if (type != RFCOMM_UIH)
		f = rfcomm_crc_table[f ^ data[2]];

	return rfcomm_crc_table[f ^ fcs] != 0xcf;
}

/* ---- L2CAP callbacks ---- */
static void rfcomm_l2state_change(struct sock *sk)
{
	BT_DBG("%p state %d", sk, sk->sk_state);
	rfcomm_schedule(RFCOMM_SCHED_STATE);
}

static void rfcomm_l2data_ready(struct sock *sk, int bytes)
{
	BT_DBG("%p bytes %d", sk, bytes);
	rfcomm_schedule(RFCOMM_SCHED_RX);
}

static int rfcomm_l2sock_create(struct socket **sock)
{
	int err;

	BT_DBG("");

	err = sock_create_kern(PF_BLUETOOTH, SOCK_SEQPACKET, BTPROTO_L2CAP, sock);
	if (!err) {
		struct sock *sk = (*sock)->sk;
		sk->sk_data_ready   = rfcomm_l2data_ready;
		sk->sk_state_change = rfcomm_l2state_change;
	}
	return err;
}

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static inline int rfcomm_check_security(struct rfcomm_dlc *d)
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{
	struct sock *sk = d->session->sock->sk;
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	__u8 auth_type;

	switch (d->sec_level) {
	case BT_SECURITY_HIGH:
		auth_type = HCI_AT_GENERAL_BONDING_MITM;
		break;
	case BT_SECURITY_MEDIUM:
		auth_type = HCI_AT_GENERAL_BONDING;
		break;
	default:
		auth_type = HCI_AT_NO_BONDING;
		break;
	}
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	return hci_conn_security(l2cap_pi(sk)->conn->hcon, d->sec_level,
								auth_type);
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}

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static void rfcomm_session_timeout(unsigned long arg)
{
	struct rfcomm_session *s = (void *) arg;

	BT_DBG("session %p state %ld", s, s->state);

	set_bit(RFCOMM_TIMED_OUT, &s->flags);
	rfcomm_session_put(s);
	rfcomm_schedule(RFCOMM_SCHED_TIMEO);
}

static void rfcomm_session_set_timer(struct rfcomm_session *s, long timeout)
{
	BT_DBG("session %p state %ld timeout %ld", s, s->state, timeout);

	if (!mod_timer(&s->timer, jiffies + timeout))
		rfcomm_session_hold(s);
}

static void rfcomm_session_clear_timer(struct rfcomm_session *s)
{
	BT_DBG("session %p state %ld", s, s->state);

	if (timer_pending(&s->timer) && del_timer(&s->timer))
		rfcomm_session_put(s);
}

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/* ---- RFCOMM DLCs ---- */
static void rfcomm_dlc_timeout(unsigned long arg)
{
	struct rfcomm_dlc *d = (void *) arg;

	BT_DBG("dlc %p state %ld", d, d->state);

	set_bit(RFCOMM_TIMED_OUT, &d->flags);
	rfcomm_dlc_put(d);
	rfcomm_schedule(RFCOMM_SCHED_TIMEO);
}

static void rfcomm_dlc_set_timer(struct rfcomm_dlc *d, long timeout)
{
	BT_DBG("dlc %p state %ld timeout %ld", d, d->state, timeout);

	if (!mod_timer(&d->timer, jiffies + timeout))
		rfcomm_dlc_hold(d);
}

static void rfcomm_dlc_clear_timer(struct rfcomm_dlc *d)
{
	BT_DBG("dlc %p state %ld", d, d->state);

	if (timer_pending(&d->timer) && del_timer(&d->timer))
		rfcomm_dlc_put(d);
}

static void rfcomm_dlc_clear_state(struct rfcomm_dlc *d)
{
	BT_DBG("%p", d);

	d->state      = BT_OPEN;
	d->flags      = 0;
	d->mscex      = 0;
	d->mtu        = RFCOMM_DEFAULT_MTU;
	d->v24_sig    = RFCOMM_V24_RTC | RFCOMM_V24_RTR | RFCOMM_V24_DV;

	d->cfc        = RFCOMM_CFC_DISABLED;
	d->rx_credits = RFCOMM_DEFAULT_CREDITS;
}

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struct rfcomm_dlc *rfcomm_dlc_alloc(gfp_t prio)
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{
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	struct rfcomm_dlc *d = kzalloc(sizeof(*d), prio);

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	if (!d)
		return NULL;

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	setup_timer(&d->timer, rfcomm_dlc_timeout, (unsigned long)d);
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	skb_queue_head_init(&d->tx_queue);
	spin_lock_init(&d->lock);
	atomic_set(&d->refcnt, 1);

	rfcomm_dlc_clear_state(d);
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	BT_DBG("%p", d);
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	return d;
}

void rfcomm_dlc_free(struct rfcomm_dlc *d)
{
	BT_DBG("%p", d);

	skb_queue_purge(&d->tx_queue);
	kfree(d);
}

static void rfcomm_dlc_link(struct rfcomm_session *s, struct rfcomm_dlc *d)
{
	BT_DBG("dlc %p session %p", d, s);

	rfcomm_session_hold(s);

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	rfcomm_session_clear_timer(s);
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	rfcomm_dlc_hold(d);
	list_add(&d->list, &s->dlcs);
	d->session = s;
}

static void rfcomm_dlc_unlink(struct rfcomm_dlc *d)
{
	struct rfcomm_session *s = d->session;

	BT_DBG("dlc %p refcnt %d session %p", d, atomic_read(&d->refcnt), s);

	list_del(&d->list);
	d->session = NULL;
	rfcomm_dlc_put(d);

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	if (list_empty(&s->dlcs))
		rfcomm_session_set_timer(s, RFCOMM_IDLE_TIMEOUT);

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	rfcomm_session_put(s);
}

static struct rfcomm_dlc *rfcomm_dlc_get(struct rfcomm_session *s, u8 dlci)
{
	struct rfcomm_dlc *d;
	struct list_head *p;

	list_for_each(p, &s->dlcs) {
		d = list_entry(p, struct rfcomm_dlc, list);
		if (d->dlci == dlci)
			return d;
	}
	return NULL;
}

static int __rfcomm_dlc_open(struct rfcomm_dlc *d, bdaddr_t *src, bdaddr_t *dst, u8 channel)
{
	struct rfcomm_session *s;
	int err = 0;
	u8 dlci;

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	BT_DBG("dlc %p state %ld %s %s channel %d",
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			d, d->state, batostr(src), batostr(dst), channel);

	if (channel < 1 || channel > 30)
		return -EINVAL;

	if (d->state != BT_OPEN && d->state != BT_CLOSED)
		return 0;

	s = rfcomm_session_get(src, dst);
	if (!s) {
		s = rfcomm_session_create(src, dst, &err);
		if (!s)
			return err;
	}

	dlci = __dlci(!s->initiator, channel);

	/* Check if DLCI already exists */
	if (rfcomm_dlc_get(s, dlci))
		return -EBUSY;

	rfcomm_dlc_clear_state(d);

	d->dlci     = dlci;
	d->addr     = __addr(s->initiator, dlci);
	d->priority = 7;

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	d->state = BT_CONFIG;
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	rfcomm_dlc_link(s, d);

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	d->out = 1;

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	d->mtu = s->mtu;
	d->cfc = (s->cfc == RFCOMM_CFC_UNKNOWN) ? 0 : s->cfc;

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	if (s->state == BT_CONNECTED) {
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		if (rfcomm_check_security(d))
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			rfcomm_send_pn(s, 1, d);
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		else
			set_bit(RFCOMM_AUTH_PENDING, &d->flags);
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	}

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	rfcomm_dlc_set_timer(d, RFCOMM_CONN_TIMEOUT);
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	return 0;
}

int rfcomm_dlc_open(struct rfcomm_dlc *d, bdaddr_t *src, bdaddr_t *dst, u8 channel)
{
	int r;

	rfcomm_lock();

	r = __rfcomm_dlc_open(d, src, dst, channel);

	rfcomm_unlock();
	return r;
}

static int __rfcomm_dlc_close(struct rfcomm_dlc *d, int err)
{
	struct rfcomm_session *s = d->session;
	if (!s)
		return 0;

	BT_DBG("dlc %p state %ld dlci %d err %d session %p",
			d, d->state, d->dlci, err, s);

	switch (d->state) {
	case BT_CONNECT:
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	case BT_CONFIG:
		if (test_and_clear_bit(RFCOMM_DEFER_SETUP, &d->flags)) {
			set_bit(RFCOMM_AUTH_REJECT, &d->flags);
			rfcomm_schedule(RFCOMM_SCHED_AUTH);
			break;
		}
		/* Fall through */

	case BT_CONNECTED:
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		d->state = BT_DISCONN;
		if (skb_queue_empty(&d->tx_queue)) {
			rfcomm_send_disc(s, d->dlci);
			rfcomm_dlc_set_timer(d, RFCOMM_DISC_TIMEOUT);
		} else {
			rfcomm_queue_disc(d);
			rfcomm_dlc_set_timer(d, RFCOMM_DISC_TIMEOUT * 2);
		}
		break;

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	case BT_OPEN:
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	case BT_CONNECT2:
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		if (test_and_clear_bit(RFCOMM_DEFER_SETUP, &d->flags)) {
			set_bit(RFCOMM_AUTH_REJECT, &d->flags);
			rfcomm_schedule(RFCOMM_SCHED_AUTH);
			break;
		}
		/* Fall through */

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	default:
		rfcomm_dlc_clear_timer(d);

		rfcomm_dlc_lock(d);
		d->state = BT_CLOSED;
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		d->state_change(d, err);
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		rfcomm_dlc_unlock(d);
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		skb_queue_purge(&d->tx_queue);
		rfcomm_dlc_unlink(d);
	}

	return 0;
}

int rfcomm_dlc_close(struct rfcomm_dlc *d, int err)
{
	int r;

	rfcomm_lock();

	r = __rfcomm_dlc_close(d, err);

	rfcomm_unlock();
	return r;
}

int rfcomm_dlc_send(struct rfcomm_dlc *d, struct sk_buff *skb)
{
	int len = skb->len;

	if (d->state != BT_CONNECTED)
		return -ENOTCONN;

	BT_DBG("dlc %p mtu %d len %d", d, d->mtu, len);

	if (len > d->mtu)
		return -EINVAL;

	rfcomm_make_uih(skb, d->addr);
	skb_queue_tail(&d->tx_queue, skb);

	if (!test_bit(RFCOMM_TX_THROTTLED, &d->flags))
		rfcomm_schedule(RFCOMM_SCHED_TX);
	return len;
}

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void __rfcomm_dlc_throttle(struct rfcomm_dlc *d)
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{
	BT_DBG("dlc %p state %ld", d, d->state);

	if (!d->cfc) {
		d->v24_sig |= RFCOMM_V24_FC;
		set_bit(RFCOMM_MSC_PENDING, &d->flags);
	}
	rfcomm_schedule(RFCOMM_SCHED_TX);
}

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void __rfcomm_dlc_unthrottle(struct rfcomm_dlc *d)
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{
	BT_DBG("dlc %p state %ld", d, d->state);

	if (!d->cfc) {
		d->v24_sig &= ~RFCOMM_V24_FC;
		set_bit(RFCOMM_MSC_PENDING, &d->flags);
	}
	rfcomm_schedule(RFCOMM_SCHED_TX);
}

560
/*
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   Set/get modem status functions use _local_ status i.e. what we report
   to the other side.
   Remote status is provided by dlc->modem_status() callback.
 */
int rfcomm_dlc_set_modem_status(struct rfcomm_dlc *d, u8 v24_sig)
{
567
	BT_DBG("dlc %p state %ld v24_sig 0x%x",
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			d, d->state, v24_sig);

	if (test_bit(RFCOMM_RX_THROTTLED, &d->flags))
		v24_sig |= RFCOMM_V24_FC;
	else
		v24_sig &= ~RFCOMM_V24_FC;
574

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	d->v24_sig = v24_sig;

	if (!test_and_set_bit(RFCOMM_MSC_PENDING, &d->flags))
		rfcomm_schedule(RFCOMM_SCHED_TX);

	return 0;
}

int rfcomm_dlc_get_modem_status(struct rfcomm_dlc *d, u8 *v24_sig)
{
585
	BT_DBG("dlc %p state %ld v24_sig 0x%x",
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			d, d->state, d->v24_sig);

	*v24_sig = d->v24_sig;
	return 0;
}

/* ---- RFCOMM sessions ---- */
static struct rfcomm_session *rfcomm_session_add(struct socket *sock, int state)
{
595 596
	struct rfcomm_session *s = kzalloc(sizeof(*s), GFP_KERNEL);

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	if (!s)
		return NULL;

	BT_DBG("session %p sock %p", s, sock);

602 603
	setup_timer(&s->timer, rfcomm_session_timeout, (unsigned long) s);

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	INIT_LIST_HEAD(&s->dlcs);
	s->state = state;
	s->sock  = sock;

	s->mtu = RFCOMM_DEFAULT_MTU;
609
	s->cfc = disable_cfc ? RFCOMM_CFC_DISABLED : RFCOMM_CFC_UNKNOWN;
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	/* Do not increment module usage count for listening sessions.
	 * Otherwise we won't be able to unload the module. */
	if (state != BT_LISTEN)
		if (!try_module_get(THIS_MODULE)) {
			kfree(s);
			return NULL;
		}

	list_add(&s->list, &session_list);

	return s;
}

static void rfcomm_session_del(struct rfcomm_session *s)
{
	int state = s->state;

	BT_DBG("session %p state %ld", s, s->state);

	list_del(&s->list);

	if (state == BT_CONNECTED)
		rfcomm_send_disc(s, 0);

635
	rfcomm_session_clear_timer(s);
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	sock_release(s->sock);
	kfree(s);

	if (state != BT_LISTEN)
		module_put(THIS_MODULE);
}

static struct rfcomm_session *rfcomm_session_get(bdaddr_t *src, bdaddr_t *dst)
{
	struct rfcomm_session *s;
	struct list_head *p, *n;
	struct bt_sock *sk;
	list_for_each_safe(p, n, &session_list) {
		s = list_entry(p, struct rfcomm_session, list);
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		sk = bt_sk(s->sock->sk);
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		if ((!bacmp(src, BDADDR_ANY) || !bacmp(&sk->src, src)) &&
				!bacmp(&sk->dst, dst))
			return s;
	}
	return NULL;
}

static void rfcomm_session_close(struct rfcomm_session *s, int err)
{
	struct rfcomm_dlc *d;
	struct list_head *p, *n;

	BT_DBG("session %p state %ld err %d", s, s->state, err);

	rfcomm_session_hold(s);

	s->state = BT_CLOSED;

	/* Close all dlcs */
	list_for_each_safe(p, n, &s->dlcs) {
		d = list_entry(p, struct rfcomm_dlc, list);
		d->state = BT_CLOSED;
		__rfcomm_dlc_close(d, err);
	}

677
	rfcomm_session_clear_timer(s);
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	rfcomm_session_put(s);
}

static struct rfcomm_session *rfcomm_session_create(bdaddr_t *src, bdaddr_t *dst, int *err)
{
	struct rfcomm_session *s = NULL;
	struct sockaddr_l2 addr;
	struct socket *sock;
	struct sock *sk;

	BT_DBG("%s %s", batostr(src), batostr(dst));

	*err = rfcomm_l2sock_create(&sock);
	if (*err < 0)
		return NULL;

	bacpy(&addr.l2_bdaddr, src);
	addr.l2_family = AF_BLUETOOTH;
	addr.l2_psm    = 0;
697
	addr.l2_cid    = 0;
698
	*err = kernel_bind(sock, (struct sockaddr *) &addr, sizeof(addr));
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	if (*err < 0)
		goto failed;

	/* Set L2CAP options */
	sk = sock->sk;
	lock_sock(sk);
705
	l2cap_pi(sk)->imtu = l2cap_mtu;
706 707
	if (l2cap_ertm)
		l2cap_pi(sk)->mode = L2CAP_MODE_ERTM;
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	release_sock(sk);

	s = rfcomm_session_add(sock, BT_BOUND);
	if (!s) {
		*err = -ENOMEM;
		goto failed;
	}

	s->initiator = 1;

	bacpy(&addr.l2_bdaddr, dst);
	addr.l2_family = AF_BLUETOOTH;
720
	addr.l2_psm    = cpu_to_le16(RFCOMM_PSM);
721
	addr.l2_cid    = 0;
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	*err = kernel_connect(sock, (struct sockaddr *) &addr, sizeof(addr), O_NONBLOCK);
723
	if (*err == 0 || *err == -EINPROGRESS)
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		return s;

	rfcomm_session_del(s);
	return NULL;

failed:
	sock_release(sock);
	return NULL;
}

void rfcomm_session_getaddr(struct rfcomm_session *s, bdaddr_t *src, bdaddr_t *dst)
{
	struct sock *sk = s->sock->sk;
	if (src)
		bacpy(src, &bt_sk(sk)->src);
	if (dst)
		bacpy(dst, &bt_sk(sk)->dst);
}

/* ---- RFCOMM frame sending ---- */
static int rfcomm_send_frame(struct rfcomm_session *s, u8 *data, int len)
{
	struct socket *sock = s->sock;
	struct kvec iv = { data, len };
	struct msghdr msg;

	BT_DBG("session %p len %d", s, len);

	memset(&msg, 0, sizeof(msg));

	return kernel_sendmsg(sock, &msg, &iv, 1, len);
}

static int rfcomm_send_sabm(struct rfcomm_session *s, u8 dlci)
{
	struct rfcomm_cmd cmd;

	BT_DBG("%p dlci %d", s, dlci);

	cmd.addr = __addr(s->initiator, dlci);
	cmd.ctrl = __ctrl(RFCOMM_SABM, 1);
	cmd.len  = __len8(0);
	cmd.fcs  = __fcs2((u8 *) &cmd);

	return rfcomm_send_frame(s, (void *) &cmd, sizeof(cmd));
}

static int rfcomm_send_ua(struct rfcomm_session *s, u8 dlci)
{
	struct rfcomm_cmd cmd;

	BT_DBG("%p dlci %d", s, dlci);

	cmd.addr = __addr(!s->initiator, dlci);
	cmd.ctrl = __ctrl(RFCOMM_UA, 1);
	cmd.len  = __len8(0);
	cmd.fcs  = __fcs2((u8 *) &cmd);

	return rfcomm_send_frame(s, (void *) &cmd, sizeof(cmd));
}

static int rfcomm_send_disc(struct rfcomm_session *s, u8 dlci)
{
	struct rfcomm_cmd cmd;

	BT_DBG("%p dlci %d", s, dlci);

	cmd.addr = __addr(s->initiator, dlci);
	cmd.ctrl = __ctrl(RFCOMM_DISC, 1);
	cmd.len  = __len8(0);
	cmd.fcs  = __fcs2((u8 *) &cmd);

	return rfcomm_send_frame(s, (void *) &cmd, sizeof(cmd));
}

static int rfcomm_queue_disc(struct rfcomm_dlc *d)
{
	struct rfcomm_cmd *cmd;
	struct sk_buff *skb;

	BT_DBG("dlc %p dlci %d", d, d->dlci);

	skb = alloc_skb(sizeof(*cmd), GFP_KERNEL);
	if (!skb)
		return -ENOMEM;

	cmd = (void *) __skb_put(skb, sizeof(*cmd));
	cmd->addr = d->addr;
	cmd->ctrl = __ctrl(RFCOMM_DISC, 1);
	cmd->len  = __len8(0);
	cmd->fcs  = __fcs2((u8 *) cmd);

	skb_queue_tail(&d->tx_queue, skb);
	rfcomm_schedule(RFCOMM_SCHED_TX);
	return 0;
}

static int rfcomm_send_dm(struct rfcomm_session *s, u8 dlci)
{
	struct rfcomm_cmd cmd;

	BT_DBG("%p dlci %d", s, dlci);

	cmd.addr = __addr(!s->initiator, dlci);
	cmd.ctrl = __ctrl(RFCOMM_DM, 1);
	cmd.len  = __len8(0);
	cmd.fcs  = __fcs2((u8 *) &cmd);

	return rfcomm_send_frame(s, (void *) &cmd, sizeof(cmd));
}

static int rfcomm_send_nsc(struct rfcomm_session *s, int cr, u8 type)
{
	struct rfcomm_hdr *hdr;
	struct rfcomm_mcc *mcc;
	u8 buf[16], *ptr = buf;

	BT_DBG("%p cr %d type %d", s, cr, type);

	hdr = (void *) ptr; ptr += sizeof(*hdr);
	hdr->addr = __addr(s->initiator, 0);
	hdr->ctrl = __ctrl(RFCOMM_UIH, 0);
	hdr->len  = __len8(sizeof(*mcc) + 1);

	mcc = (void *) ptr; ptr += sizeof(*mcc);
	mcc->type = __mcc_type(cr, RFCOMM_NSC);
	mcc->len  = __len8(1);

	/* Type that we didn't like */
	*ptr = __mcc_type(cr, type); ptr++;

	*ptr = __fcs(buf); ptr++;

	return rfcomm_send_frame(s, buf, ptr - buf);
}

static int rfcomm_send_pn(struct rfcomm_session *s, int cr, struct rfcomm_dlc *d)
{
	struct rfcomm_hdr *hdr;
	struct rfcomm_mcc *mcc;
	struct rfcomm_pn  *pn;
	u8 buf[16], *ptr = buf;

	BT_DBG("%p cr %d dlci %d mtu %d", s, cr, d->dlci, d->mtu);

	hdr = (void *) ptr; ptr += sizeof(*hdr);
	hdr->addr = __addr(s->initiator, 0);
	hdr->ctrl = __ctrl(RFCOMM_UIH, 0);
	hdr->len  = __len8(sizeof(*mcc) + sizeof(*pn));

	mcc = (void *) ptr; ptr += sizeof(*mcc);
	mcc->type = __mcc_type(cr, RFCOMM_PN);
	mcc->len  = __len8(sizeof(*pn));

	pn = (void *) ptr; ptr += sizeof(*pn);
	pn->dlci        = d->dlci;
	pn->priority    = d->priority;
	pn->ack_timer   = 0;
	pn->max_retrans = 0;

	if (s->cfc) {
		pn->flow_ctrl = cr ? 0xf0 : 0xe0;
		pn->credits = RFCOMM_DEFAULT_CREDITS;
	} else {
		pn->flow_ctrl = 0;
		pn->credits   = 0;
	}

892
	if (cr && channel_mtu >= 0)
893
		pn->mtu = cpu_to_le16(channel_mtu);
894
	else
895
		pn->mtu = cpu_to_le16(d->mtu);
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	*ptr = __fcs(buf); ptr++;

	return rfcomm_send_frame(s, buf, ptr - buf);
}

902 903
int rfcomm_send_rpn(struct rfcomm_session *s, int cr, u8 dlci,
			u8 bit_rate, u8 data_bits, u8 stop_bits,
904
			u8 parity, u8 flow_ctrl_settings,
905
			u8 xon_char, u8 xoff_char, u16 param_mask)
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{
	struct rfcomm_hdr *hdr;
	struct rfcomm_mcc *mcc;
	struct rfcomm_rpn *rpn;
	u8 buf[16], *ptr = buf;

	BT_DBG("%p cr %d dlci %d bit_r 0x%x data_b 0x%x stop_b 0x%x parity 0x%x"
913 914
			" flwc_s 0x%x xon_c 0x%x xoff_c 0x%x p_mask 0x%x",
		s, cr, dlci, bit_rate, data_bits, stop_bits, parity,
915
		flow_ctrl_settings, xon_char, xoff_char, param_mask);
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	hdr = (void *) ptr; ptr += sizeof(*hdr);
	hdr->addr = __addr(s->initiator, 0);
	hdr->ctrl = __ctrl(RFCOMM_UIH, 0);
	hdr->len  = __len8(sizeof(*mcc) + sizeof(*rpn));

	mcc = (void *) ptr; ptr += sizeof(*mcc);
	mcc->type = __mcc_type(cr, RFCOMM_RPN);
	mcc->len  = __len8(sizeof(*rpn));

	rpn = (void *) ptr; ptr += sizeof(*rpn);
	rpn->dlci          = __addr(1, dlci);
	rpn->bit_rate      = bit_rate;
	rpn->line_settings = __rpn_line_settings(data_bits, stop_bits, parity);
	rpn->flow_ctrl     = flow_ctrl_settings;
	rpn->xon_char      = xon_char;
	rpn->xoff_char     = xoff_char;
933
	rpn->param_mask    = cpu_to_le16(param_mask);
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	*ptr = __fcs(buf); ptr++;

	return rfcomm_send_frame(s, buf, ptr - buf);
}

static int rfcomm_send_rls(struct rfcomm_session *s, int cr, u8 dlci, u8 status)
{
	struct rfcomm_hdr *hdr;
	struct rfcomm_mcc *mcc;
	struct rfcomm_rls *rls;
	u8 buf[16], *ptr = buf;

	BT_DBG("%p cr %d status 0x%x", s, cr, status);

	hdr = (void *) ptr; ptr += sizeof(*hdr);
	hdr->addr = __addr(s->initiator, 0);
	hdr->ctrl = __ctrl(RFCOMM_UIH, 0);
	hdr->len  = __len8(sizeof(*mcc) + sizeof(*rls));

	mcc = (void *) ptr; ptr += sizeof(*mcc);
	mcc->type = __mcc_type(cr, RFCOMM_RLS);
	mcc->len  = __len8(sizeof(*rls));

	rls = (void *) ptr; ptr += sizeof(*rls);
	rls->dlci   = __addr(1, dlci);
	rls->status = status;

	*ptr = __fcs(buf); ptr++;

	return rfcomm_send_frame(s, buf, ptr - buf);
}

static int rfcomm_send_msc(struct rfcomm_session *s, int cr, u8 dlci, u8 v24_sig)
{
	struct rfcomm_hdr *hdr;
	struct rfcomm_mcc *mcc;
	struct rfcomm_msc *msc;
	u8 buf[16], *ptr = buf;

	BT_DBG("%p cr %d v24 0x%x", s, cr, v24_sig);

	hdr = (void *) ptr; ptr += sizeof(*hdr);
	hdr->addr = __addr(s->initiator, 0);
	hdr->ctrl = __ctrl(RFCOMM_UIH, 0);
	hdr->len  = __len8(sizeof(*mcc) + sizeof(*msc));

	mcc = (void *) ptr; ptr += sizeof(*mcc);
	mcc->type = __mcc_type(cr, RFCOMM_MSC);
	mcc->len  = __len8(sizeof(*msc));

	msc = (void *) ptr; ptr += sizeof(*msc);
	msc->dlci    = __addr(1, dlci);
	msc->v24_sig = v24_sig | 0x01;

	*ptr = __fcs(buf); ptr++;

	return rfcomm_send_frame(s, buf, ptr - buf);
}

static int rfcomm_send_fcoff(struct rfcomm_session *s, int cr)
{
	struct rfcomm_hdr *hdr;
	struct rfcomm_mcc *mcc;
	u8 buf[16], *ptr = buf;

	BT_DBG("%p cr %d", s, cr);

	hdr = (void *) ptr; ptr += sizeof(*hdr);
	hdr->addr = __addr(s->initiator, 0);
	hdr->ctrl = __ctrl(RFCOMM_UIH, 0);
	hdr->len  = __len8(sizeof(*mcc));

	mcc = (void *) ptr; ptr += sizeof(*mcc);
	mcc->type = __mcc_type(cr, RFCOMM_FCOFF);
	mcc->len  = __len8(0);

	*ptr = __fcs(buf); ptr++;

	return rfcomm_send_frame(s, buf, ptr - buf);
}

static int rfcomm_send_fcon(struct rfcomm_session *s, int cr)
{
	struct rfcomm_hdr *hdr;
	struct rfcomm_mcc *mcc;
	u8 buf[16], *ptr = buf;

	BT_DBG("%p cr %d", s, cr);

	hdr = (void *) ptr; ptr += sizeof(*hdr);
	hdr->addr = __addr(s->initiator, 0);
	hdr->ctrl = __ctrl(RFCOMM_UIH, 0);
	hdr->len  = __len8(sizeof(*mcc));

	mcc = (void *) ptr; ptr += sizeof(*mcc);
	mcc->type = __mcc_type(cr, RFCOMM_FCON);
	mcc->len  = __len8(0);

	*ptr = __fcs(buf); ptr++;

	return rfcomm_send_frame(s, buf, ptr - buf);
}

static int rfcomm_send_test(struct rfcomm_session *s, int cr, u8 *pattern, int len)
{
	struct socket *sock = s->sock;
	struct kvec iv[3];
	struct msghdr msg;
	unsigned char hdr[5], crc[1];

	if (len > 125)
		return -EINVAL;

	BT_DBG("%p cr %d", s, cr);

	hdr[0] = __addr(s->initiator, 0);
	hdr[1] = __ctrl(RFCOMM_UIH, 0);
	hdr[2] = 0x01 | ((len + 2) << 1);
	hdr[3] = 0x01 | ((cr & 0x01) << 1) | (RFCOMM_TEST << 2);
	hdr[4] = 0x01 | (len << 1);

	crc[0] = __fcs(hdr);

	iv[0].iov_base = hdr;
	iv[0].iov_len  = 5;
	iv[1].iov_base = pattern;
	iv[1].iov_len  = len;
	iv[2].iov_base = crc;
	iv[2].iov_len  = 1;

	memset(&msg, 0, sizeof(msg));

	return kernel_sendmsg(sock, &msg, iv, 3, 6 + len);
}

static int rfcomm_send_credits(struct rfcomm_session *s, u8 addr, u8 credits)
{
	struct rfcomm_hdr *hdr;
	u8 buf[16], *ptr = buf;

	BT_DBG("%p addr %d credits %d", s, addr, credits);

	hdr = (void *) ptr; ptr += sizeof(*hdr);
	hdr->addr = addr;
	hdr->ctrl = __ctrl(RFCOMM_UIH, 1);
	hdr->len  = __len8(0);

	*ptr = credits; ptr++;

	*ptr = __fcs(buf); ptr++;

	return rfcomm_send_frame(s, buf, ptr - buf);
}

static void rfcomm_make_uih(struct sk_buff *skb, u8 addr)
{
	struct rfcomm_hdr *hdr;
	int len = skb->len;
	u8 *crc;

	if (len > 127) {
		hdr = (void *) skb_push(skb, 4);
1097
		put_unaligned(cpu_to_le16(__len16(len)), (__le16 *) &hdr->len);
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	} else {
		hdr = (void *) skb_push(skb, 3);
		hdr->len = __len8(len);
	}
	hdr->addr = addr;
	hdr->ctrl = __ctrl(RFCOMM_UIH, 0);

	crc = skb_put(skb, 1);
	*crc = __fcs((void *) hdr);
}

/* ---- RFCOMM frame reception ---- */
static int rfcomm_recv_ua(struct rfcomm_session *s, u8 dlci)
{
	BT_DBG("session %p state %ld dlci %d", s, s->state, dlci);

	if (dlci) {
		/* Data channel */
		struct rfcomm_dlc *d = rfcomm_dlc_get(s, dlci);
		if (!d) {
			rfcomm_send_dm(s, dlci);
			return 0;
		}

		switch (d->state) {
		case BT_CONNECT:
			rfcomm_dlc_clear_timer(d);

			rfcomm_dlc_lock(d);
			d->state = BT_CONNECTED;
			d->state_change(d, 0);
			rfcomm_dlc_unlock(d);

			rfcomm_send_msc(s, 1, dlci, d->v24_sig);
			break;

		case BT_DISCONN:
			d->state = BT_CLOSED;
			__rfcomm_dlc_close(d, 0);
1137 1138 1139 1140 1141 1142

			if (list_empty(&s->dlcs)) {
				s->state = BT_DISCONN;
				rfcomm_send_disc(s, 0);
			}

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			break;
		}
	} else {
		/* Control channel */
		switch (s->state) {
		case BT_CONNECT:
			s->state = BT_CONNECTED;
			rfcomm_process_connect(s);
			break;
1152 1153 1154 1155

		case BT_DISCONN:
			rfcomm_session_put(s);
			break;
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		}
	}
	return 0;
}

static int rfcomm_recv_dm(struct rfcomm_session *s, u8 dlci)
{
	int err = 0;

	BT_DBG("session %p state %ld dlci %d", s, s->state, dlci);

	if (dlci) {
		/* Data DLC */
		struct rfcomm_dlc *d = rfcomm_dlc_get(s, dlci);
		if (d) {
			if (d->state == BT_CONNECT || d->state == BT_CONFIG)
				err = ECONNREFUSED;
			else
				err = ECONNRESET;

			d->state = BT_CLOSED;
			__rfcomm_dlc_close(d, err);
		}
	} else {
		if (s->state == BT_CONNECT)
			err = ECONNREFUSED;
		else
			err = ECONNRESET;

		s->state = BT_CLOSED;
		rfcomm_session_close(s, err);
	}
	return 0;
}

static int rfcomm_recv_disc(struct rfcomm_session *s, u8 dlci)
{
	int err = 0;

	BT_DBG("session %p state %ld dlci %d", s, s->state, dlci);

	if (dlci) {
		struct rfcomm_dlc *d = rfcomm_dlc_get(s, dlci);
		if (d) {
			rfcomm_send_ua(s, dlci);

			if (d->state == BT_CONNECT || d->state == BT_CONFIG)
				err = ECONNREFUSED;
			else
				err = ECONNRESET;

			d->state = BT_CLOSED;
			__rfcomm_dlc_close(d, err);
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		} else
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			rfcomm_send_dm(s, dlci);
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	} else {
		rfcomm_send_ua(s, 0);

		if (s->state == BT_CONNECT)
			err = ECONNREFUSED;
		else
			err = ECONNRESET;

		s->state = BT_CLOSED;
		rfcomm_session_close(s, err);
	}

	return 0;
}

1227
void rfcomm_dlc_accept(struct rfcomm_dlc *d)
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{
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	struct sock *sk = d->session->sock->sk;

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	BT_DBG("dlc %p", d);

	rfcomm_send_ua(d->session, d->dlci);

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	rfcomm_dlc_clear_timer(d);

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	rfcomm_dlc_lock(d);
	d->state = BT_CONNECTED;
	d->state_change(d, 0);
	rfcomm_dlc_unlock(d);

1242
	if (d->role_switch)
1243 1244
		hci_conn_switch_role(l2cap_pi(sk)->conn->hcon, 0x00);

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	rfcomm_send_msc(d->session, 1, d->dlci, d->v24_sig);
}

1248 1249
static void rfcomm_check_accept(struct rfcomm_dlc *d)
{
1250
	if (rfcomm_check_security(d)) {
1251 1252 1253
		if (d->defer_setup) {
			set_bit(RFCOMM_DEFER_SETUP, &d->flags);
			rfcomm_dlc_set_timer(d, RFCOMM_AUTH_TIMEOUT);
1254 1255 1256 1257 1258

			rfcomm_dlc_lock(d);
			d->state = BT_CONNECT2;
			d->state_change(d, 0);
			rfcomm_dlc_unlock(d);
1259 1260
		} else
			rfcomm_dlc_accept(d);
1261 1262 1263
	} else {
		set_bit(RFCOMM_AUTH_PENDING, &d->flags);
		rfcomm_dlc_set_timer(d, RFCOMM_AUTH_TIMEOUT);
1264 1265 1266
	}
}

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static int rfcomm_recv_sabm(struct rfcomm_session *s, u8 dlci)
{
	struct rfcomm_dlc *d;
	u8 channel;

	BT_DBG("session %p state %ld dlci %d", s, s->state, dlci);

	if (!dlci) {
		rfcomm_send_ua(s, 0);

		if (s->state == BT_OPEN) {
			s->state = BT_CONNECTED;
			rfcomm_process_connect(s);
		}
		return 0;
	}

	/* Check if DLC exists */
	d = rfcomm_dlc_get(s, dlci);
	if (d) {
		if (d->state == BT_OPEN) {
			/* DLC was previously opened by PN request */
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			rfcomm_check_accept(d);
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		}
		return 0;
	}

	/* Notify socket layer about incoming connection */
	channel = __srv_channel(dlci);
	if (rfcomm_connect_ind(s, channel, &d)) {
		d->dlci = dlci;
		d->addr = __addr(s->initiator, dlci);
		rfcomm_dlc_link(s, d);

1301
		rfcomm_check_accept(d);
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	} else {
		rfcomm_send_dm(s, dlci);
	}

	return 0;
}

static int rfcomm_apply_pn(struct rfcomm_dlc *d, int cr, struct rfcomm_pn *pn)
{
	struct rfcomm_session *s = d->session;

1313
	BT_DBG("dlc %p state %ld dlci %d mtu %d fc 0x%x credits %d",
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			d, d->state, d->dlci, pn->mtu, pn->flow_ctrl, pn->credits);

1316 1317 1318
	if ((pn->flow_ctrl == 0xf0 && s->cfc != RFCOMM_CFC_DISABLED) ||
						pn->flow_ctrl == 0xe0) {
		d->cfc = RFCOMM_CFC_ENABLED;
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		d->tx_credits = pn->credits;
	} else {
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		d->cfc = RFCOMM_CFC_DISABLED;
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		set_bit(RFCOMM_TX_THROTTLED, &d->flags);
	}

1325 1326 1327
	if (s->cfc == RFCOMM_CFC_UNKNOWN)
		s->cfc = d->cfc;

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	d->priority = pn->priority;

1330
	d->mtu = __le16_to_cpu(pn->mtu);
1331 1332 1333

	if (cr && d->mtu > s->mtu)
		d->mtu = s->mtu;
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	return 0;
}

static int rfcomm_recv_pn(struct rfcomm_session *s, int cr, struct sk_buff *skb)
{
	struct rfcomm_pn *pn = (void *) skb->data;
	struct rfcomm_dlc *d;
	u8 dlci = pn->dlci;

	BT_DBG("session %p state %ld dlci %d", s, s->state, dlci);

	if (!dlci)
		return 0;

	d = rfcomm_dlc_get(s, dlci);
	if (d) {
		if (cr) {
			/* PN request */
			rfcomm_apply_pn(d, cr, pn);
			rfcomm_send_pn(s, 0, d);
		} else {
			/* PN response */
			switch (d->state) {
			case BT_CONFIG:
				rfcomm_apply_pn(d, cr, pn);

				d->state = BT_CONNECT;
				rfcomm_send_sabm(s, d->dlci);
				break;
			}
		}
	} else {
		u8 channel = __srv_channel(dlci);

		if (!cr)
			return 0;

		/* PN request for non existing DLC.
		 * Assume incoming connection. */
		if (rfcomm_connect_ind(s, channel, &d)) {
			d->dlci = dlci;
			d->addr = __addr(s->initiator, dlci);
			rfcomm_dlc_link(s, d);

			rfcomm_apply_pn(d, cr, pn);

			d->state = BT_OPEN;
			rfcomm_send_pn(s, 0, d);
		} else {
			rfcomm_send_dm(s, dlci);
		}
	}
	return 0;
}

static int rfcomm_recv_rpn(struct rfcomm_session *s, int cr, int len, struct sk_buff *skb)
{
	struct rfcomm_rpn *rpn = (void *) skb->data;
	u8 dlci = __get_dlci(rpn->dlci);

	u8 bit_rate  = 0;
	u8 data_bits = 0;
	u8 stop_bits = 0;
	u8 parity    = 0;
	u8 flow_ctrl = 0;
	u8 xon_char  = 0;
	u8 xoff_char = 0;
	u16 rpn_mask = RFCOMM_RPN_PM_ALL;
1403 1404 1405 1406 1407 1408

	BT_DBG("dlci %d cr %d len 0x%x bitr 0x%x line 0x%x flow 0x%x xonc 0x%x xoffc 0x%x pm 0x%x",
		dlci, cr, len, rpn->bit_rate, rpn->line_settings, rpn->flow_ctrl,
		rpn->xon_char, rpn->xoff_char, rpn->param_mask);

	if (!cr)
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		return 0;
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	if (len == 1) {
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		/* This is a request, return default settings */
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		bit_rate  = RFCOMM_RPN_BR_115200;
		data_bits = RFCOMM_RPN_DATA_8;
		stop_bits = RFCOMM_RPN_STOP_1;
		parity    = RFCOMM_RPN_PARITY_NONE;
		flow_ctrl = RFCOMM_RPN_FLOW_NONE;
		xon_char  = RFCOMM_RPN_XON_CHAR;
		xoff_char = RFCOMM_RPN_XOFF_CHAR;
		goto rpn_out;
	}
1422 1423 1424 1425

	/* Check for sane values, ignore/accept bit_rate, 8 bits, 1 stop bit,
	 * no parity, no flow control lines, normal XON/XOFF chars */

1426
	if (rpn->param_mask & cpu_to_le16(RFCOMM_RPN_PM_BITRATE)) {
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		bit_rate = rpn->bit_rate;
		if (bit_rate != RFCOMM_RPN_BR_115200) {
			BT_DBG("RPN bit rate mismatch 0x%x", bit_rate);
			bit_rate = RFCOMM_RPN_BR_115200;
			rpn_mask ^= RFCOMM_RPN_PM_BITRATE;
		}
	}
1434

1435
	if (rpn->param_mask & cpu_to_le16(RFCOMM_RPN_PM_DATA)) {
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		data_bits = __get_rpn_data_bits(rpn->line_settings);
		if (data_bits != RFCOMM_RPN_DATA_8) {
			BT_DBG("RPN data bits mismatch 0x%x", data_bits);
			data_bits = RFCOMM_RPN_DATA_8;
			rpn_mask ^= RFCOMM_RPN_PM_DATA;
		}
	}
1443

1444
	if (rpn->param_mask & cpu_to_le16(RFCOMM_RPN_PM_STOP)) {
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		stop_bits = __get_rpn_stop_bits(rpn->line_settings);
		if (stop_bits != RFCOMM_RPN_STOP_1) {
			BT_DBG("RPN stop bits mismatch 0x%x", stop_bits);
			stop_bits = RFCOMM_RPN_STOP_1;
			rpn_mask ^= RFCOMM_RPN_PM_STOP;
		}
	}
1452

1453
	if (rpn->param_mask & cpu_to_le16(RFCOMM_RPN_PM_PARITY)) {
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		parity = __get_rpn_parity(rpn->line_settings);
		if (parity != RFCOMM_RPN_PARITY_NONE) {
			BT_DBG("RPN parity mismatch 0x%x", parity);
			parity = RFCOMM_RPN_PARITY_NONE;
			rpn_mask ^= RFCOMM_RPN_PM_PARITY;
		}
	}
1461

1462
	if (rpn->param_mask & cpu_to_le16(RFCOMM_RPN_PM_FLOW)) {
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		flow_ctrl = rpn->flow_ctrl;
		if (flow_ctrl != RFCOMM_RPN_FLOW_NONE) {
			BT_DBG("RPN flow ctrl mismatch 0x%x", flow_ctrl);
			flow_ctrl = RFCOMM_RPN_FLOW_NONE;
			rpn_mask ^= RFCOMM_RPN_PM_FLOW;
		}
	}
1470

1471
	if (rpn->param_mask & cpu_to_le16(RFCOMM_RPN_PM_XON)) {
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		xon_char = rpn->xon_char;
		if (xon_char != RFCOMM_RPN_XON_CHAR) {
			BT_DBG("RPN XON char mismatch 0x%x", xon_char);
			xon_char = RFCOMM_RPN_XON_CHAR;
			rpn_mask ^= RFCOMM_RPN_PM_XON;
		}
	}
1479

1480
	if (rpn->param_mask & cpu_to_le16(RFCOMM_RPN_PM_XOFF)) {
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		xoff_char = rpn->xoff_char;
		if (xoff_char != RFCOMM_RPN_XOFF_CHAR) {
			BT_DBG("RPN XOFF char mismatch 0x%x", xoff_char);
			xoff_char = RFCOMM_RPN_XOFF_CHAR;
			rpn_mask ^= RFCOMM_RPN_PM_XOFF;
		}
	}

rpn_out:
1490 1491
	rfcomm_send_rpn(s, 0, dlci, bit_rate, data_bits, stop_bits,
			parity, flow_ctrl, xon_char, xoff_char, rpn_mask);
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	return 0;
}

static int rfcomm_recv_rls(struct rfcomm_session *s, int cr, struct sk_buff *skb)
{
	struct rfcomm_rls *rls = (void *) skb->data;
	u8 dlci = __get_dlci(rls->dlci);

	BT_DBG("dlci %d cr %d status 0x%x", dlci, cr, rls->status);
1502

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	if (!cr)
		return 0;

1506 1507 1508
	/* We should probably do something with this information here. But
	 * for now it's sufficient just to reply -- Bluetooth 1.1 says it's
	 * mandatory to recognise and respond to RLS */
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	rfcomm_send_rls(s, 0, dlci, rls->status);

	return 0;
}

static int rfcomm_recv_msc(struct rfcomm_session *s, int cr, struct sk_buff *skb)
{
	struct rfcomm_msc *msc = (void *) skb->data;
	struct rfcomm_dlc *d;
	u8 dlci = __get_dlci(msc->dlci);

	BT_DBG("dlci %d cr %d v24 0x%x", dlci, cr, msc->v24_sig);

	d = rfcomm_dlc_get(s, dlci);
1524
	if (!d)
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		return 0;

	if (cr) {
		if (msc->v24_sig & RFCOMM_V24_FC && !d->cfc)
			set_bit(RFCOMM_TX_THROTTLED, &d->flags);
		else
			clear_bit(RFCOMM_TX_THROTTLED, &d->flags);
1532

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		rfcomm_dlc_lock(d);
1534 1535 1536

		d->remote_v24_sig = msc->v24_sig;

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		if (d->modem_status)
			d->modem_status(d, msc->v24_sig);
1539

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		rfcomm_dlc_unlock(d);
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		rfcomm_send_msc(s, 0, dlci, msc->v24_sig);

		d->mscex |= RFCOMM_MSCEX_RX;
1545
	} else
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		d->mscex |= RFCOMM_MSCEX_TX;

	return 0;
}

static int rfcomm_recv_mcc(struct rfcomm_session *s, struct sk_buff *skb)
{
	struct rfcomm_mcc *mcc = (void *) skb->data;
	u8 type, cr, len;

	cr   = __test_cr(mcc->type);
	type = __get_mcc_type(mcc->type);
	len  = __get_mcc_len(mcc->len);

	BT_DBG("%p type 0x%x cr %d", s, type, cr);

	skb_pull(skb, 2);

	switch (type) {
	case RFCOMM_PN:
		rfcomm_recv_pn(s, cr, skb);
		break;

	case RFCOMM_RPN:
		rfcomm_recv_rpn(s, cr, len, skb);
		break;

	case RFCOMM_RLS:
		rfcomm_recv_rls(s, cr, skb);
		break;

	case RFCOMM_MSC:
		rfcomm_recv_msc(s, cr, skb);
		break;

	case RFCOMM_FCOFF:
		if (cr) {
			set_bit(RFCOMM_TX_THROTTLED, &s->flags);
			rfcomm_send_fcoff(s, 0);
		}
		break;

	case RFCOMM_FCON:
		if (cr) {
			clear_bit(RFCOMM_TX_THROTTLED, &s->flags);
			rfcomm_send_fcon(s, 0);
		}
		break;

	case RFCOMM_TEST:
		if (cr)
			rfcomm_send_test(s, 0, skb->data, skb->len);
		break;

	case RFCOMM_NSC:
		break;

	default:
		BT_ERR("Unknown control type 0x%02x", type);
		rfcomm_send_nsc(s, cr, type);
		break;
	}
	return 0;
}

static int rfcomm_recv_data(struct rfcomm_session *s, u8 dlci, int pf, struct sk_buff *skb)
{
	struct rfcomm_dlc *d;

	BT_DBG("session %p state %ld dlci %d pf %d", s, s->state, dlci, pf);

	d = rfcomm_dlc_get(s, dlci);
	if (!d) {
		rfcomm_send_dm(s, dlci);
		goto drop;
	}

	if (pf && d->cfc) {
		u8 credits = *(u8 *) skb->data; skb_pull(skb, 1);

		d->tx_credits += credits;
		if (d->tx_credits)
			clear_bit(RFCOMM_TX_THROTTLED, &d->flags);
	}

	if (skb->len && d->state == BT_CONNECTED) {
		rfcomm_dlc_lock(d);
		d->rx_credits--;
		d->data_ready(d, skb);
		rfcomm_dlc_unlock(d);
		return 0;
	}

drop:
	kfree_skb(skb);
	return 0;
}

static int rfcomm_recv_frame(struct rfcomm_session *s, struct sk_buff *skb)
{
	struct rfcomm_hdr *hdr = (void *) skb->data;
	u8 type, dlci, fcs;

	dlci = __get_dlci(hdr->addr);
	type = __get_type(hdr->ctrl);

	/* Trim FCS */
	skb->len--; skb->tail--;
1654
	fcs = *(u8 *)skb_tail_pointer(skb);
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	if (__check_fcs(skb->data, type, fcs)) {
		BT_ERR("bad checksum in packet");
		kfree_skb(skb);
		return -EILSEQ;
	}

	if (__test_ea(hdr->len))
		skb_pull(skb, 3);
	else
		skb_pull(skb, 4);

	switch (type) {
	case RFCOMM_SABM:
		if (__test_pf(hdr->ctrl))
			rfcomm_recv_sabm(s, dlci);
		break;

	case RFCOMM_DISC:
		if (__test_pf(hdr->ctrl))
			rfcomm_recv_disc(s, dlci);
		break;

	case RFCOMM_UA:
		if (__test_pf(hdr->ctrl))
			rfcomm_recv_ua(s, dlci);
		break;

	case RFCOMM_DM:
		rfcomm_recv_dm(s, dlci);
		break;

	case RFCOMM_UIH:
		if (dlci)
			return rfcomm_recv_data(s, dlci, __test_pf(hdr->ctrl), skb);

		rfcomm_recv_mcc(s, skb);
		break;

	default:
		BT_ERR("Unknown packet type 0x%02x\n", type);
		break;
	}
	kfree_skb(skb);
	return 0;
}

/* ---- Connection and data processing ---- */

static void rfcomm_process_connect(struct rfcomm_session *s)
{
	struct rfcomm_dlc *d;
	struct list_head *p, *n;

	BT_DBG("session %p state %ld", s, s->state);

	list_for_each_safe(p, n, &s->dlcs) {
		d = list_entry(p, struct rfcomm_dlc, list);
		if (d->state == BT_CONFIG) {
			d->mtu = s->mtu;
1715
			if (rfcomm_check_security(d)) {
1716 1717
				rfcomm_send_pn(s, 1, d);
			} else {
1718 1719
				set_bit(RFCOMM_AUTH_PENDING, &d->flags);
				rfcomm_dlc_set_timer(d, RFCOMM_AUTH_TIMEOUT);
1720
			}
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		}
	}
}

/* Send data queued for the DLC.
 * Return number of frames left in the queue.
 */
static inline int rfcomm_process_tx(struct rfcomm_dlc *d)
{
	struct sk_buff *skb;
	int err;

1733
	BT_DBG("dlc %p state %ld cfc %d rx_credits %d tx_credits %d",
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			d, d->state, d->cfc, d->rx_credits, d->tx_credits);

	/* Send pending MSC */
	if (test_and_clear_bit(RFCOMM_MSC_PENDING, &d->flags))
1738
		rfcomm_send_msc(d->session, 1, d->dlci, d->v24_sig);
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1739 1740

	if (d->cfc) {
1741
		/* CFC enabled.
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		 * Give them some credits */
		if (!test_bit(RFCOMM_RX_THROTTLED, &d->flags) &&
1744
				d->rx_credits <= (d->cfc >> 2)) {
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			rfcomm_send_credits(d->session, d->addr, d->cfc - d->rx_credits);
			d->rx_credits = d->cfc;
		}
	} else {
		/* CFC disabled.
		 * Give ourselves some credits */
		d->tx_credits = 5;
	}

	if (test_bit(RFCOMM_TX_THROTTLED, &d->flags))
		return skb_queue_len(&d->tx_queue);

	while (d->tx_credits && (skb = skb_dequeue(&d->tx_queue))) {
		err = rfcomm_send_frame(d->session, skb->data, skb->len);
		if (err < 0) {
			skb_queue_head(&d->tx_queue, skb);
			break;
		}
		kfree_skb(skb);
		d->tx_credits--;
	}

	if (d->cfc && !d->tx_credits) {
		/* We're out of TX credits.
		 * Set TX_THROTTLED flag to avoid unnesary wakeups by dlc_send. */
		set_bit(RFCOMM_TX_THROTTLED, &d->flags);
	}

	return skb_queue_len(&d->tx_queue);
}

static inline void rfcomm_process_dlcs(struct rfcomm_session *s)
{
	struct rfcomm_dlc *d;
	struct list_head *p, *n;

	BT_DBG("session %p state %ld", s, s->state);

	list_for_each_safe(p, n, &s->dlcs) {
		d = list_entry(p, struct rfcomm_dlc, list);

		if (test_bit(RFCOMM_TIMED_OUT, &d->flags)) {
			__rfcomm_dlc_close(d, ETIMEDOUT);
			continue;
		}

		if (test_and_clear_bit(RFCOMM_AUTH_ACCEPT, &d->flags)) {
			rfcomm_dlc_clear_timer(d);
1793 1794 1795
			if (d->out) {
				rfcomm_send_pn(s, 1, d);
				rfcomm_dlc_set_timer(d, RFCOMM_CONN_TIMEOUT);
1796 1797 1798 1799
			} else {
				if (d->defer_setup) {
					set_bit(RFCOMM_DEFER_SETUP, &d->flags);
					rfcomm_dlc_set_timer(d, RFCOMM_AUTH_TIMEOUT);
1800 1801 1802 1803 1804

					rfcomm_dlc_lock(d);
					d->state = BT_CONNECT2;
					d->state_change(d, 0);
					rfcomm_dlc_unlock(d);
1805 1806 1807
				} else
					rfcomm_dlc_accept(d);
			}
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			continue;
		} else if (test_and_clear_bit(RFCOMM_AUTH_REJECT, &d->flags)) {
			rfcomm_dlc_clear_timer(d);
1811 1812 1813 1814
			if (!d->out)
				rfcomm_send_dm(s, d->dlci);
			else
				d->state = BT_CLOSED;
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			__rfcomm_dlc_close(d, ECONNREFUSED);
			continue;
		}

1819 1820 1821
		if (test_bit(RFCOMM_SEC_PENDING, &d->flags))
			continue;

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		if (test_bit(RFCOMM_TX_THROTTLED, &s->flags))
			continue;

		if ((d->state == BT_CONNECTED || d->state == BT_DISCONN) &&
1826
						d->mscex == RFCOMM_MSCEX_OK)
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			rfcomm_process_tx(d);
	}
}

static inline void rfcomm_process_rx(struct rfcomm_session *s)
{
	struct socket *sock = s->sock;
	struct sock *sk = sock->sk;
	struct sk_buff *skb;

	BT_DBG("session %p state %ld qlen %d", s, s->state, skb_queue_len(&sk->sk_receive_queue));

	/* Get data directly from socket receive queue without copying it. */
	while ((skb = skb_dequeue(&sk->sk_receive_queue))) {
		skb_orphan(skb);
		rfcomm_recv_frame(s, skb);
	}

	if (sk->sk_state == BT_CLOSED) {
		if (!s->initiator)
			rfcomm_session_put(s);

		rfcomm_session_close(s, sk->sk_err);
	}
}

static inline void rfcomm_accept_connection(struct rfcomm_session *s)
{
	struct socket *sock = s->sock, *nsock;
	int err;

	/* Fast check for a new connection.
	 * Avoids unnesesary socket allocations. */
	if (list_empty(&bt_sk(sock->sk)->accept_q))
		return;

	BT_DBG("session %p", s);

1865 1866
	err = kernel_accept(sock, &nsock, O_NONBLOCK);
	if (err < 0)
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		return;

	/* Set our callbacks */
	nsock->sk->sk_data_ready   = rfcomm_l2data_ready;
	nsock->sk->sk_state_change = rfcomm_l2state_change;

	s = rfcomm_session_add(nsock, BT_OPEN);
	if (s) {
		rfcomm_session_hold(s);
1876 1877 1878 1879 1880

		/* We should adjust MTU on incoming sessions.
		 * L2CAP MTU minus UIH header and FCS. */
		s->mtu = min(l2cap_pi(nsock->sk)->omtu, l2cap_pi(nsock->sk)->imtu) - 5;

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		rfcomm_schedule(RFCOMM_SCHED_RX);
	} else
		sock_release(nsock);
}

static inline void rfcomm_check_connection(struct rfcomm_session *s)
{
	struct sock *sk = s->sock->sk;

	BT_DBG("%p state %ld", s, s->state);

	switch(sk->sk_state) {
	case BT_CONNECTED:
		s->state = BT_CONNECT;

		/* We can adjust MTU on outgoing sessions.
		 * L2CAP MTU minus UIH header and FCS. */
		s->mtu = min(l2cap_pi(sk)->omtu, l2cap_pi(sk)->imtu) - 5;

		rfcomm_send_sabm(s, 0);
		break;

	case BT_CLOSED:
		s->state = BT_CLOSED;
		rfcomm_session_close(s, sk->sk_err);
		break;
	}
}

static inline void rfcomm_process_sessions(void)
{
	struct list_head *p, *n;

	rfcomm_lock();

	list_for_each_safe(p, n, &session_list) {
		struct rfcomm_session *s;
		s = list_entry(p, struct rfcomm_session, list);

1920 1921 1922 1923 1924 1925
		if (test_and_clear_bit(RFCOMM_TIMED_OUT, &s->flags)) {
			s->state = BT_DISCONN;
			rfcomm_send_disc(s, 0);
			continue;
		}

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		if (s->state == BT_LISTEN) {
			rfcomm_accept_connection(s);
			continue;
		}

		rfcomm_session_hold(s);

		switch (s->state) {
		case BT_BOUND:
			rfcomm_check_connection(s);
			break;

		default:
			rfcomm_process_rx(s);
			break;
		}

		rfcomm_process_dlcs(s);

		rfcomm_session_put(s);
	}

	rfcomm_unlock();
}

static int rfcomm_add_listener(bdaddr_t *ba)
{
	struct sockaddr_l2 addr;
	struct socket *sock;
	struct sock *sk;
	struct rfcomm_session *s;
	int    err = 0;

	/* Create socket */
	err = rfcomm_l2sock_create(&sock);
1961
	if (err < 0) {
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		BT_ERR("Create socket failed %d", err);
		return err;
	}

	/* Bind socket */
	bacpy(&addr.l2_bdaddr, ba);
	addr.l2_family = AF_BLUETOOTH;
1969
	addr.l2_psm    = cpu_to_le16(RFCOMM_PSM);
1970
	addr.l2_cid    = 0;
1971
	err = kernel_bind(sock, (struct sockaddr *) &addr, sizeof(addr));
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	if (err < 0) {
		BT_ERR("Bind failed %d", err);
		goto failed;
	}

	/* Set L2CAP options */
	sk = sock->sk;
	lock_sock(sk);
1980
	l2cap_pi(sk)->imtu = l2cap_mtu;
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	release_sock(sk);

	/* Start listening on the socket */
1984
	err = kernel_listen(sock, 10);
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1985 1986 1987 1988 1989 1990 1991 1992 1993 1994 1995 1996 1997 1998 1999 2000 2001 2002 2003 2004 2005 2006 2007 2008 2009 2010 2011 2012 2013 2014 2015 2016
	if (err) {
		BT_ERR("Listen failed %d", err);
		goto failed;
	}

	/* Add listening session */
	s = rfcomm_session_add(sock, BT_LISTEN);
	if (!s)
		goto failed;

	rfcomm_session_hold(s);
	return 0;
failed:
	sock_release(sock);
	return err;
}

static void rfcomm_kill_listener(void)
{
	struct rfcomm_session *s;
	struct list_head *p, *n;

	BT_DBG("");

	list_for_each_safe(p, n, &session_list) {
		s = list_entry(p, struct rfcomm_session, list);
		rfcomm_session_del(s);
	}
}

static int rfcomm_run(void *unused)
{
2017
	BT_DBG("");
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	set_user_nice(current, -10);

	rfcomm_add_listener(BDADDR_ANY);

2023 2024 2025 2026 2027 2028 2029 2030 2031 2032 2033 2034 2035
	while (!kthread_should_stop()) {
		set_current_state(TASK_INTERRUPTIBLE);
		if (!test_bit(RFCOMM_SCHED_WAKEUP, &rfcomm_event)) {
			/* No pending events. Let's sleep.
			 * Incoming connections and data will wake us up. */
			schedule();
		}
		set_current_state(TASK_RUNNING);

		/* Process stuff */
		clear_bit(RFCOMM_SCHED_WAKEUP, &rfcomm_event);
		rfcomm_process_sessions();
	}
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2036 2037 2038 2039 2040 2041

	rfcomm_kill_listener();

	return 0;
}

2042
static void rfcomm_security_cfm(struct hci_conn *conn, u8 status, u8 encrypt)
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2043 2044 2045 2046 2047 2048 2049 2050 2051 2052 2053 2054 2055 2056 2057 2058
{
	struct rfcomm_session *s;
	struct rfcomm_dlc *d;
	struct list_head *p, *n;

	BT_DBG("conn %p status 0x%02x encrypt 0x%02x", conn, status, encrypt);

	s = rfcomm_session_get(&conn->hdev->bdaddr, &conn->dst);
	if (!s)
		return;

	rfcomm_session_hold(s);

	list_for_each_safe(p, n, &s->dlcs) {
		d = list_entry(p, struct rfcomm_dlc, list);

2059 2060 2061 2062 2063 2064 2065 2066 2067 2068 2069 2070 2071 2072 2073 2074 2075
		if (test_and_clear_bit(RFCOMM_SEC_PENDING, &d->flags)) {
			rfcomm_dlc_clear_timer(d);
			if (status || encrypt == 0x00) {
				__rfcomm_dlc_close(d, ECONNREFUSED);
				continue;
			}
		}

		if (d->state == BT_CONNECTED && !status && encrypt == 0x00) {
			if (d->sec_level == BT_SECURITY_MEDIUM) {
				set_bit(RFCOMM_SEC_PENDING, &d->flags);
				rfcomm_dlc_set_timer(d, RFCOMM_AUTH_TIMEOUT);
				continue;
			} else if (d->sec_level == BT_SECURITY_HIGH) {
				__rfcomm_dlc_close(d, ECONNREFUSED);
				continue;
			}
2076 2077
		}

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2078 2079 2080
		if (!test_and_clear_bit(RFCOMM_AUTH_PENDING, &d->flags))
			continue;

2081
		if (!status)
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2082 2083 2084 2085 2086 2087 2088 2089 2090 2091 2092 2093
			set_bit(RFCOMM_AUTH_ACCEPT, &d->flags);
		else
			set_bit(RFCOMM_AUTH_REJECT, &d->flags);
	}

	rfcomm_session_put(s);

	rfcomm_schedule(RFCOMM_SCHED_AUTH);
}

static struct hci_cb rfcomm_cb = {
	.name		= "RFCOMM",
2094
	.security_cfm	= rfcomm_security_cfm
L
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2095 2096
};

2097
static ssize_t rfcomm_dlc_sysfs_show(struct class *dev, char *buf)
L
Linus Torvalds 已提交
2098 2099 2100
{
	struct rfcomm_session *s;
	struct list_head *pp, *p;
2101
	char *str = buf;
L
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2102 2103 2104 2105 2106

	rfcomm_lock();

	list_for_each(p, &session_list) {
		s = list_entry(p, struct rfcomm_session, list);
2107 2108 2109
		list_for_each(pp, &s->dlcs) {
			struct sock *sk = s->sock->sk;
			struct rfcomm_dlc *d = list_entry(pp, struct rfcomm_dlc, list);
L
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2110

2111 2112 2113
			str += sprintf(str, "%s %s %ld %d %d %d %d\n",
					batostr(&bt_sk(sk)->src), batostr(&bt_sk(sk)->dst),
					d->state, d->dlci, d->mtu, d->rx_credits, d->tx_credits);
L
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2114 2115 2116 2117 2118
		}
	}

	rfcomm_unlock();

2119
	return (str - buf);
L
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2120 2121
}

2122
static CLASS_ATTR(rfcomm_dlc, S_IRUGO, rfcomm_dlc_sysfs_show, NULL);
L
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2123 2124 2125 2126

/* ---- Initialization ---- */
static int __init rfcomm_init(void)
{
2127
	int err;
D
Dave Young 已提交
2128

L
Linus Torvalds 已提交
2129 2130 2131 2132
	l2cap_load();

	hci_register_cb(&rfcomm_cb);

2133 2134
	rfcomm_thread = kthread_run(rfcomm_run, NULL, "krfcommd");
	if (IS_ERR(rfcomm_thread)) {
2135 2136
		err = PTR_ERR(rfcomm_thread);
		goto unregister;
2137
	}
L
Linus Torvalds 已提交
2138

2139 2140
	if (class_create_file(bt_class, &class_attr_rfcomm_dlc) < 0)
		BT_ERR("Failed to create RFCOMM info file");
L
Linus Torvalds 已提交
2141

2142 2143 2144
	err = rfcomm_init_ttys();
	if (err < 0)
		goto stop;
L
Linus Torvalds 已提交
2145

2146 2147 2148
	err = rfcomm_init_sockets();
	if (err < 0)
		goto cleanup;
L
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2149

2150 2151
	BT_INFO("RFCOMM ver %s", VERSION);

L
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2152
	return 0;
D
Dave Young 已提交
2153

2154
cleanup:
D
Dave Young 已提交
2155
	rfcomm_cleanup_ttys();
2156 2157

stop:
D
Dave Young 已提交
2158
	kthread_stop(rfcomm_thread);
2159 2160

unregister:
D
Dave Young 已提交
2161 2162
	hci_unregister_cb(&rfcomm_cb);

2163
	return err;
L
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2164 2165 2166 2167
}

static void __exit rfcomm_exit(void)
{
2168
	class_remove_file(bt_class, &class_attr_rfcomm_dlc);
2169

L
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2170 2171
	hci_unregister_cb(&rfcomm_cb);

2172
	kthread_stop(rfcomm_thread);
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2173 2174 2175 2176 2177 2178 2179 2180 2181

	rfcomm_cleanup_ttys();

	rfcomm_cleanup_sockets();
}

module_init(rfcomm_init);
module_exit(rfcomm_exit);

2182 2183 2184
module_param(disable_cfc, bool, 0644);
MODULE_PARM_DESC(disable_cfc, "Disable credit based flow control");

2185 2186 2187
module_param(channel_mtu, int, 0644);
MODULE_PARM_DESC(channel_mtu, "Default MTU for the RFCOMM channel");

2188 2189 2190
module_param(l2cap_mtu, uint, 0644);
MODULE_PARM_DESC(l2cap_mtu, "Default MTU for the L2CAP connection");

2191 2192 2193
module_param(l2cap_ertm, bool, 0644);
MODULE_PARM_DESC(l2cap_ertm, "Use L2CAP ERTM mode for connection");

2194
MODULE_AUTHOR("Marcel Holtmann <marcel@holtmann.org>");
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2195 2196 2197 2198
MODULE_DESCRIPTION("Bluetooth RFCOMM ver " VERSION);
MODULE_VERSION(VERSION);
MODULE_LICENSE("GPL");
MODULE_ALIAS("bt-proto-3");