![Tejun Heo](/assets/img/avatar_default.png)
percpu.h is included by sched.h and module.h and thus ends up being included when building most .c files. percpu.h includes slab.h which in turn includes gfp.h making everything defined by the two files universally available and complicating inclusion dependencies. percpu.h -> slab.h dependency is about to be removed. Prepare for this change by updating users of gfp and slab facilities include those headers directly instead of assuming availability. As this conversion needs to touch large number of source files, the following script is used as the basis of conversion. http://userweb.kernel.org/~tj/misc/slabh-sweep.py The script does the followings. * Scan files for gfp and slab usages and update includes such that only the necessary includes are there. ie. if only gfp is used, gfp.h, if slab is used, slab.h. * When the script inserts a new include, it looks at the include blocks and try to put the new include such that its order conforms to its surrounding. It's put in the include block which contains core kernel includes, in the same order that the rest are ordered - alphabetical, Christmas tree, rev-Xmas-tree or at the end if there doesn't seem to be any matching order. * If the script can't find a place to put a new include (mostly because the file doesn't have fitting include block), it prints out an error message indicating which .h file needs to be added to the file. The conversion was done in the following steps. 1. The initial automatic conversion of all .c files updated slightly over 4000 files, deleting around 700 includes and adding ~480 gfp.h and ~3000 slab.h inclusions. The script emitted errors for ~400 files. 2. Each error was manually checked. Some didn't need the inclusion, some needed manual addition while adding it to implementation .h or embedding .c file was more appropriate for others. This step added inclusions to around 150 files. 3. The script was run again and the output was compared to the edits from #2 to make sure no file was left behind. 4. Several build tests were done and a couple of problems were fixed. e.g. lib/decompress_*.c used malloc/free() wrappers around slab APIs requiring slab.h to be added manually. 5. The script was run on all .h files but without automatically editing them as sprinkling gfp.h and slab.h inclusions around .h files could easily lead to inclusion dependency hell. Most gfp.h inclusion directives were ignored as stuff from gfp.h was usually wildly available and often used in preprocessor macros. Each slab.h inclusion directive was examined and added manually as necessary. 6. percpu.h was updated not to include slab.h. 7. Build test were done on the following configurations and failures were fixed. CONFIG_GCOV_KERNEL was turned off for all tests (as my distributed build env didn't work with gcov compiles) and a few more options had to be turned off depending on archs to make things build (like ipr on powerpc/64 which failed due to missing writeq). * x86 and x86_64 UP and SMP allmodconfig and a custom test config. * powerpc and powerpc64 SMP allmodconfig * sparc and sparc64 SMP allmodconfig * ia64 SMP allmodconfig * s390 SMP allmodconfig * alpha SMP allmodconfig * um on x86_64 SMP allmodconfig 8. percpu.h modifications were reverted so that it could be applied as a separate patch and serve as bisection point. Given the fact that I had only a couple of failures from tests on step 6, I'm fairly confident about the coverage of this conversion patch. If there is a breakage, it's likely to be something in one of the arch headers which should be easily discoverable easily on most builds of the specific arch. Signed-off-by: Tejun Heo <tj@kernel.org> Guess-its-ok-by: Christoph Lameter <cl@linux-foundation.org> Cc: Ingo Molnar <mingo@redhat.com> Cc: Lee Schermerhorn <Lee.Schermerhorn@hp.com>
2223 lines
50 KiB
C
2223 lines
50 KiB
C
/*
|
|
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
|
|
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
|
|
OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
|
|
|
|
ALL LIABILITY, INCLUDING LIABILITY FOR INFRINGEMENT OF ANY PATENTS,
|
|
COPYRIGHTS, TRADEMARKS OR OTHER RIGHTS, RELATING TO USE OF THIS
|
|
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>
|
|
#include <linux/device.h>
|
|
#include <linux/debugfs.h>
|
|
#include <linux/seq_file.h>
|
|
#include <linux/net.h>
|
|
#include <linux/mutex.h>
|
|
#include <linux/kthread.h>
|
|
#include <linux/slab.h>
|
|
|
|
#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>
|
|
|
|
#define VERSION "1.11"
|
|
|
|
static int disable_cfc = 0;
|
|
static int channel_mtu = -1;
|
|
static unsigned int l2cap_mtu = RFCOMM_MAX_L2CAP_MTU;
|
|
static int l2cap_ertm = 0;
|
|
|
|
static struct task_struct *rfcomm_thread;
|
|
|
|
static DEFINE_MUTEX(rfcomm_mutex);
|
|
#define rfcomm_lock() mutex_lock(&rfcomm_mutex)
|
|
#define rfcomm_unlock() mutex_unlock(&rfcomm_mutex)
|
|
|
|
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 */
|
|
#define __rpn_line_settings(data, stop, parity) ((data & 0x3) | ((stop & 0x1) << 2) | ((parity & 0x7) << 3))
|
|
#define __get_rpn_data_bits(line) ((line) & 0x3)
|
|
#define __get_rpn_stop_bits(line) (((line) >> 2) & 0x1)
|
|
#define __get_rpn_parity(line) (((line) >> 3) & 0x7)
|
|
|
|
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 ---- */
|
|
|
|
/* reversed, 8-bit, poly=0x07 */
|
|
static unsigned char rfcomm_crc_table[256] = {
|
|
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
|
|
};
|
|
|
|
/* CRC on 2 bytes */
|
|
#define __crc(data) (rfcomm_crc_table[rfcomm_crc_table[0xff ^ data[0]] ^ data[1]])
|
|
|
|
/* FCS on 2 bytes */
|
|
static inline u8 __fcs(u8 *data)
|
|
{
|
|
return (0xff - __crc(data));
|
|
}
|
|
|
|
/* FCS on 3 bytes */
|
|
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;
|
|
}
|
|
|
|
static inline int rfcomm_check_security(struct rfcomm_dlc *d)
|
|
{
|
|
struct sock *sk = d->session->sock->sk;
|
|
__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;
|
|
}
|
|
|
|
return hci_conn_security(l2cap_pi(sk)->conn->hcon, d->sec_level,
|
|
auth_type);
|
|
}
|
|
|
|
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_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);
|
|
}
|
|
|
|
/* ---- 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;
|
|
}
|
|
|
|
struct rfcomm_dlc *rfcomm_dlc_alloc(gfp_t prio)
|
|
{
|
|
struct rfcomm_dlc *d = kzalloc(sizeof(*d), prio);
|
|
|
|
if (!d)
|
|
return NULL;
|
|
|
|
setup_timer(&d->timer, rfcomm_dlc_timeout, (unsigned long)d);
|
|
|
|
skb_queue_head_init(&d->tx_queue);
|
|
spin_lock_init(&d->lock);
|
|
atomic_set(&d->refcnt, 1);
|
|
|
|
rfcomm_dlc_clear_state(d);
|
|
|
|
BT_DBG("%p", d);
|
|
|
|
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);
|
|
|
|
rfcomm_session_clear_timer(s);
|
|
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);
|
|
|
|
if (list_empty(&s->dlcs))
|
|
rfcomm_session_set_timer(s, RFCOMM_IDLE_TIMEOUT);
|
|
|
|
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;
|
|
|
|
BT_DBG("dlc %p state %ld %s %s channel %d",
|
|
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;
|
|
|
|
d->state = BT_CONFIG;
|
|
rfcomm_dlc_link(s, d);
|
|
|
|
d->out = 1;
|
|
|
|
d->mtu = s->mtu;
|
|
d->cfc = (s->cfc == RFCOMM_CFC_UNKNOWN) ? 0 : s->cfc;
|
|
|
|
if (s->state == BT_CONNECTED) {
|
|
if (rfcomm_check_security(d))
|
|
rfcomm_send_pn(s, 1, d);
|
|
else
|
|
set_bit(RFCOMM_AUTH_PENDING, &d->flags);
|
|
}
|
|
|
|
rfcomm_dlc_set_timer(d, RFCOMM_CONN_TIMEOUT);
|
|
|
|
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:
|
|
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:
|
|
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;
|
|
|
|
case BT_OPEN:
|
|
case BT_CONNECT2:
|
|
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 */
|
|
|
|
default:
|
|
rfcomm_dlc_clear_timer(d);
|
|
|
|
rfcomm_dlc_lock(d);
|
|
d->state = BT_CLOSED;
|
|
d->state_change(d, err);
|
|
rfcomm_dlc_unlock(d);
|
|
|
|
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;
|
|
}
|
|
|
|
void __rfcomm_dlc_throttle(struct rfcomm_dlc *d)
|
|
{
|
|
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);
|
|
}
|
|
|
|
void __rfcomm_dlc_unthrottle(struct rfcomm_dlc *d)
|
|
{
|
|
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);
|
|
}
|
|
|
|
/*
|
|
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)
|
|
{
|
|
BT_DBG("dlc %p state %ld v24_sig 0x%x",
|
|
d, d->state, v24_sig);
|
|
|
|
if (test_bit(RFCOMM_RX_THROTTLED, &d->flags))
|
|
v24_sig |= RFCOMM_V24_FC;
|
|
else
|
|
v24_sig &= ~RFCOMM_V24_FC;
|
|
|
|
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)
|
|
{
|
|
BT_DBG("dlc %p state %ld v24_sig 0x%x",
|
|
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)
|
|
{
|
|
struct rfcomm_session *s = kzalloc(sizeof(*s), GFP_KERNEL);
|
|
|
|
if (!s)
|
|
return NULL;
|
|
|
|
BT_DBG("session %p sock %p", s, sock);
|
|
|
|
setup_timer(&s->timer, rfcomm_session_timeout, (unsigned long) s);
|
|
|
|
INIT_LIST_HEAD(&s->dlcs);
|
|
s->state = state;
|
|
s->sock = sock;
|
|
|
|
s->mtu = RFCOMM_DEFAULT_MTU;
|
|
s->cfc = disable_cfc ? RFCOMM_CFC_DISABLED : RFCOMM_CFC_UNKNOWN;
|
|
|
|
/* 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);
|
|
|
|
rfcomm_session_clear_timer(s);
|
|
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);
|
|
sk = bt_sk(s->sock->sk);
|
|
|
|
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);
|
|
}
|
|
|
|
rfcomm_session_clear_timer(s);
|
|
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;
|
|
addr.l2_cid = 0;
|
|
*err = kernel_bind(sock, (struct sockaddr *) &addr, sizeof(addr));
|
|
if (*err < 0)
|
|
goto failed;
|
|
|
|
/* Set L2CAP options */
|
|
sk = sock->sk;
|
|
lock_sock(sk);
|
|
l2cap_pi(sk)->imtu = l2cap_mtu;
|
|
if (l2cap_ertm)
|
|
l2cap_pi(sk)->mode = L2CAP_MODE_ERTM;
|
|
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;
|
|
addr.l2_psm = cpu_to_le16(RFCOMM_PSM);
|
|
addr.l2_cid = 0;
|
|
*err = kernel_connect(sock, (struct sockaddr *) &addr, sizeof(addr), O_NONBLOCK);
|
|
if (*err == 0 || *err == -EINPROGRESS)
|
|
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;
|
|
}
|
|
|
|
if (cr && channel_mtu >= 0)
|
|
pn->mtu = cpu_to_le16(channel_mtu);
|
|
else
|
|
pn->mtu = cpu_to_le16(d->mtu);
|
|
|
|
*ptr = __fcs(buf); ptr++;
|
|
|
|
return rfcomm_send_frame(s, buf, ptr - buf);
|
|
}
|
|
|
|
int rfcomm_send_rpn(struct rfcomm_session *s, int cr, u8 dlci,
|
|
u8 bit_rate, u8 data_bits, u8 stop_bits,
|
|
u8 parity, u8 flow_ctrl_settings,
|
|
u8 xon_char, u8 xoff_char, u16 param_mask)
|
|
{
|
|
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"
|
|
" 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,
|
|
flow_ctrl_settings, xon_char, xoff_char, param_mask);
|
|
|
|
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;
|
|
rpn->param_mask = cpu_to_le16(param_mask);
|
|
|
|
*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);
|
|
put_unaligned(cpu_to_le16(__len16(len)), (__le16 *) &hdr->len);
|
|
} 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);
|
|
|
|
if (list_empty(&s->dlcs)) {
|
|
s->state = BT_DISCONN;
|
|
rfcomm_send_disc(s, 0);
|
|
}
|
|
|
|
break;
|
|
}
|
|
} else {
|
|
/* Control channel */
|
|
switch (s->state) {
|
|
case BT_CONNECT:
|
|
s->state = BT_CONNECTED;
|
|
rfcomm_process_connect(s);
|
|
break;
|
|
|
|
case BT_DISCONN:
|
|
/* When socket is closed and we are not RFCOMM
|
|
* initiator rfcomm_process_rx already calls
|
|
* rfcomm_session_put() */
|
|
if (s->sock->sk->sk_state != BT_CLOSED)
|
|
rfcomm_session_put(s);
|
|
break;
|
|
}
|
|
}
|
|
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);
|
|
} else
|
|
rfcomm_send_dm(s, dlci);
|
|
|
|
} 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;
|
|
}
|
|
|
|
void rfcomm_dlc_accept(struct rfcomm_dlc *d)
|
|
{
|
|
struct sock *sk = d->session->sock->sk;
|
|
|
|
BT_DBG("dlc %p", d);
|
|
|
|
rfcomm_send_ua(d->session, d->dlci);
|
|
|
|
rfcomm_dlc_clear_timer(d);
|
|
|
|
rfcomm_dlc_lock(d);
|
|
d->state = BT_CONNECTED;
|
|
d->state_change(d, 0);
|
|
rfcomm_dlc_unlock(d);
|
|
|
|
if (d->role_switch)
|
|
hci_conn_switch_role(l2cap_pi(sk)->conn->hcon, 0x00);
|
|
|
|
rfcomm_send_msc(d->session, 1, d->dlci, d->v24_sig);
|
|
}
|
|
|
|
static void rfcomm_check_accept(struct rfcomm_dlc *d)
|
|
{
|
|
if (rfcomm_check_security(d)) {
|
|
if (d->defer_setup) {
|
|
set_bit(RFCOMM_DEFER_SETUP, &d->flags);
|
|
rfcomm_dlc_set_timer(d, RFCOMM_AUTH_TIMEOUT);
|
|
|
|
rfcomm_dlc_lock(d);
|
|
d->state = BT_CONNECT2;
|
|
d->state_change(d, 0);
|
|
rfcomm_dlc_unlock(d);
|
|
} else
|
|
rfcomm_dlc_accept(d);
|
|
} else {
|
|
set_bit(RFCOMM_AUTH_PENDING, &d->flags);
|
|
rfcomm_dlc_set_timer(d, RFCOMM_AUTH_TIMEOUT);
|
|
}
|
|
}
|
|
|
|
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 */
|
|
rfcomm_check_accept(d);
|
|
}
|
|
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);
|
|
|
|
rfcomm_check_accept(d);
|
|
} 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;
|
|
|
|
BT_DBG("dlc %p state %ld dlci %d mtu %d fc 0x%x credits %d",
|
|
d, d->state, d->dlci, pn->mtu, pn->flow_ctrl, pn->credits);
|
|
|
|
if ((pn->flow_ctrl == 0xf0 && s->cfc != RFCOMM_CFC_DISABLED) ||
|
|
pn->flow_ctrl == 0xe0) {
|
|
d->cfc = RFCOMM_CFC_ENABLED;
|
|
d->tx_credits = pn->credits;
|
|
} else {
|
|
d->cfc = RFCOMM_CFC_DISABLED;
|
|
set_bit(RFCOMM_TX_THROTTLED, &d->flags);
|
|
}
|
|
|
|
if (s->cfc == RFCOMM_CFC_UNKNOWN)
|
|
s->cfc = d->cfc;
|
|
|
|
d->priority = pn->priority;
|
|
|
|
d->mtu = __le16_to_cpu(pn->mtu);
|
|
|
|
if (cr && d->mtu > s->mtu)
|
|
d->mtu = s->mtu;
|
|
|
|
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;
|
|
|
|
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)
|
|
return 0;
|
|
|
|
if (len == 1) {
|
|
/* This is a request, return default settings */
|
|
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;
|
|
}
|
|
|
|
/* Check for sane values, ignore/accept bit_rate, 8 bits, 1 stop bit,
|
|
* no parity, no flow control lines, normal XON/XOFF chars */
|
|
|
|
if (rpn->param_mask & cpu_to_le16(RFCOMM_RPN_PM_BITRATE)) {
|
|
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;
|
|
}
|
|
}
|
|
|
|
if (rpn->param_mask & cpu_to_le16(RFCOMM_RPN_PM_DATA)) {
|
|
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;
|
|
}
|
|
}
|
|
|
|
if (rpn->param_mask & cpu_to_le16(RFCOMM_RPN_PM_STOP)) {
|
|
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;
|
|
}
|
|
}
|
|
|
|
if (rpn->param_mask & cpu_to_le16(RFCOMM_RPN_PM_PARITY)) {
|
|
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;
|
|
}
|
|
}
|
|
|
|
if (rpn->param_mask & cpu_to_le16(RFCOMM_RPN_PM_FLOW)) {
|
|
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;
|
|
}
|
|
}
|
|
|
|
if (rpn->param_mask & cpu_to_le16(RFCOMM_RPN_PM_XON)) {
|
|
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;
|
|
}
|
|
}
|
|
|
|
if (rpn->param_mask & cpu_to_le16(RFCOMM_RPN_PM_XOFF)) {
|
|
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:
|
|
rfcomm_send_rpn(s, 0, dlci, bit_rate, data_bits, stop_bits,
|
|
parity, flow_ctrl, xon_char, xoff_char, rpn_mask);
|
|
|
|
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);
|
|
|
|
if (!cr)
|
|
return 0;
|
|
|
|
/* 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 */
|
|
|
|
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);
|
|
if (!d)
|
|
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);
|
|
|
|
rfcomm_dlc_lock(d);
|
|
|
|
d->remote_v24_sig = msc->v24_sig;
|
|
|
|
if (d->modem_status)
|
|
d->modem_status(d, msc->v24_sig);
|
|
|
|
rfcomm_dlc_unlock(d);
|
|
|
|
rfcomm_send_msc(s, 0, dlci, msc->v24_sig);
|
|
|
|
d->mscex |= RFCOMM_MSCEX_RX;
|
|
} else
|
|
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--;
|
|
fcs = *(u8 *)skb_tail_pointer(skb);
|
|
|
|
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;
|
|
if (rfcomm_check_security(d)) {
|
|
rfcomm_send_pn(s, 1, d);
|
|
} else {
|
|
set_bit(RFCOMM_AUTH_PENDING, &d->flags);
|
|
rfcomm_dlc_set_timer(d, RFCOMM_AUTH_TIMEOUT);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
/* 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;
|
|
|
|
BT_DBG("dlc %p state %ld cfc %d rx_credits %d tx_credits %d",
|
|
d, d->state, d->cfc, d->rx_credits, d->tx_credits);
|
|
|
|
/* Send pending MSC */
|
|
if (test_and_clear_bit(RFCOMM_MSC_PENDING, &d->flags))
|
|
rfcomm_send_msc(d->session, 1, d->dlci, d->v24_sig);
|
|
|
|
if (d->cfc) {
|
|
/* CFC enabled.
|
|
* Give them some credits */
|
|
if (!test_bit(RFCOMM_RX_THROTTLED, &d->flags) &&
|
|
d->rx_credits <= (d->cfc >> 2)) {
|
|
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);
|
|
if (d->out) {
|
|
rfcomm_send_pn(s, 1, d);
|
|
rfcomm_dlc_set_timer(d, RFCOMM_CONN_TIMEOUT);
|
|
} else {
|
|
if (d->defer_setup) {
|
|
set_bit(RFCOMM_DEFER_SETUP, &d->flags);
|
|
rfcomm_dlc_set_timer(d, RFCOMM_AUTH_TIMEOUT);
|
|
|
|
rfcomm_dlc_lock(d);
|
|
d->state = BT_CONNECT2;
|
|
d->state_change(d, 0);
|
|
rfcomm_dlc_unlock(d);
|
|
} else
|
|
rfcomm_dlc_accept(d);
|
|
}
|
|
continue;
|
|
} else if (test_and_clear_bit(RFCOMM_AUTH_REJECT, &d->flags)) {
|
|
rfcomm_dlc_clear_timer(d);
|
|
if (!d->out)
|
|
rfcomm_send_dm(s, d->dlci);
|
|
else
|
|
d->state = BT_CLOSED;
|
|
__rfcomm_dlc_close(d, ECONNREFUSED);
|
|
continue;
|
|
}
|
|
|
|
if (test_bit(RFCOMM_SEC_PENDING, &d->flags))
|
|
continue;
|
|
|
|
if (test_bit(RFCOMM_TX_THROTTLED, &s->flags))
|
|
continue;
|
|
|
|
if ((d->state == BT_CONNECTED || d->state == BT_DISCONN) &&
|
|
d->mscex == RFCOMM_MSCEX_OK)
|
|
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);
|
|
|
|
err = kernel_accept(sock, &nsock, O_NONBLOCK);
|
|
if (err < 0)
|
|
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);
|
|
|
|
/* 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;
|
|
|
|
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);
|
|
|
|
if (test_and_clear_bit(RFCOMM_TIMED_OUT, &s->flags)) {
|
|
s->state = BT_DISCONN;
|
|
rfcomm_send_disc(s, 0);
|
|
rfcomm_session_put(s);
|
|
continue;
|
|
}
|
|
|
|
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);
|
|
if (err < 0) {
|
|
BT_ERR("Create socket failed %d", err);
|
|
return err;
|
|
}
|
|
|
|
/* Bind socket */
|
|
bacpy(&addr.l2_bdaddr, ba);
|
|
addr.l2_family = AF_BLUETOOTH;
|
|
addr.l2_psm = cpu_to_le16(RFCOMM_PSM);
|
|
addr.l2_cid = 0;
|
|
err = kernel_bind(sock, (struct sockaddr *) &addr, sizeof(addr));
|
|
if (err < 0) {
|
|
BT_ERR("Bind failed %d", err);
|
|
goto failed;
|
|
}
|
|
|
|
/* Set L2CAP options */
|
|
sk = sock->sk;
|
|
lock_sock(sk);
|
|
l2cap_pi(sk)->imtu = l2cap_mtu;
|
|
release_sock(sk);
|
|
|
|
/* Start listening on the socket */
|
|
err = kernel_listen(sock, 10);
|
|
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)
|
|
{
|
|
BT_DBG("");
|
|
|
|
set_user_nice(current, -10);
|
|
|
|
rfcomm_add_listener(BDADDR_ANY);
|
|
|
|
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();
|
|
}
|
|
|
|
rfcomm_kill_listener();
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void rfcomm_security_cfm(struct hci_conn *conn, u8 status, u8 encrypt)
|
|
{
|
|
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);
|
|
|
|
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;
|
|
}
|
|
}
|
|
|
|
if (!test_and_clear_bit(RFCOMM_AUTH_PENDING, &d->flags))
|
|
continue;
|
|
|
|
if (!status)
|
|
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",
|
|
.security_cfm = rfcomm_security_cfm
|
|
};
|
|
|
|
static int rfcomm_dlc_debugfs_show(struct seq_file *f, void *x)
|
|
{
|
|
struct rfcomm_session *s;
|
|
struct list_head *pp, *p;
|
|
|
|
rfcomm_lock();
|
|
|
|
list_for_each(p, &session_list) {
|
|
s = list_entry(p, struct rfcomm_session, list);
|
|
list_for_each(pp, &s->dlcs) {
|
|
struct sock *sk = s->sock->sk;
|
|
struct rfcomm_dlc *d = list_entry(pp, struct rfcomm_dlc, list);
|
|
|
|
seq_printf(f, "%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);
|
|
}
|
|
}
|
|
|
|
rfcomm_unlock();
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int rfcomm_dlc_debugfs_open(struct inode *inode, struct file *file)
|
|
{
|
|
return single_open(file, rfcomm_dlc_debugfs_show, inode->i_private);
|
|
}
|
|
|
|
static const struct file_operations rfcomm_dlc_debugfs_fops = {
|
|
.open = rfcomm_dlc_debugfs_open,
|
|
.read = seq_read,
|
|
.llseek = seq_lseek,
|
|
.release = single_release,
|
|
};
|
|
|
|
static struct dentry *rfcomm_dlc_debugfs;
|
|
|
|
/* ---- Initialization ---- */
|
|
static int __init rfcomm_init(void)
|
|
{
|
|
int err;
|
|
|
|
l2cap_load();
|
|
|
|
hci_register_cb(&rfcomm_cb);
|
|
|
|
rfcomm_thread = kthread_run(rfcomm_run, NULL, "krfcommd");
|
|
if (IS_ERR(rfcomm_thread)) {
|
|
err = PTR_ERR(rfcomm_thread);
|
|
goto unregister;
|
|
}
|
|
|
|
if (bt_debugfs) {
|
|
rfcomm_dlc_debugfs = debugfs_create_file("rfcomm_dlc", 0444,
|
|
bt_debugfs, NULL, &rfcomm_dlc_debugfs_fops);
|
|
if (!rfcomm_dlc_debugfs)
|
|
BT_ERR("Failed to create RFCOMM debug file");
|
|
}
|
|
|
|
err = rfcomm_init_ttys();
|
|
if (err < 0)
|
|
goto stop;
|
|
|
|
err = rfcomm_init_sockets();
|
|
if (err < 0)
|
|
goto cleanup;
|
|
|
|
BT_INFO("RFCOMM ver %s", VERSION);
|
|
|
|
return 0;
|
|
|
|
cleanup:
|
|
rfcomm_cleanup_ttys();
|
|
|
|
stop:
|
|
kthread_stop(rfcomm_thread);
|
|
|
|
unregister:
|
|
hci_unregister_cb(&rfcomm_cb);
|
|
|
|
return err;
|
|
}
|
|
|
|
static void __exit rfcomm_exit(void)
|
|
{
|
|
debugfs_remove(rfcomm_dlc_debugfs);
|
|
|
|
hci_unregister_cb(&rfcomm_cb);
|
|
|
|
kthread_stop(rfcomm_thread);
|
|
|
|
rfcomm_cleanup_ttys();
|
|
|
|
rfcomm_cleanup_sockets();
|
|
}
|
|
|
|
module_init(rfcomm_init);
|
|
module_exit(rfcomm_exit);
|
|
|
|
module_param(disable_cfc, bool, 0644);
|
|
MODULE_PARM_DESC(disable_cfc, "Disable credit based flow control");
|
|
|
|
module_param(channel_mtu, int, 0644);
|
|
MODULE_PARM_DESC(channel_mtu, "Default MTU for the RFCOMM channel");
|
|
|
|
module_param(l2cap_mtu, uint, 0644);
|
|
MODULE_PARM_DESC(l2cap_mtu, "Default MTU for the L2CAP connection");
|
|
|
|
module_param(l2cap_ertm, bool, 0644);
|
|
MODULE_PARM_DESC(l2cap_ertm, "Use L2CAP ERTM mode for connection");
|
|
|
|
MODULE_AUTHOR("Marcel Holtmann <marcel@holtmann.org>");
|
|
MODULE_DESCRIPTION("Bluetooth RFCOMM ver " VERSION);
|
|
MODULE_VERSION(VERSION);
|
|
MODULE_LICENSE("GPL");
|
|
MODULE_ALIAS("bt-proto-3");
|