WSL2-Linux-Kernel/net/bluetooth/rfcomm/core.c

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C
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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
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/debugfs.h>
#include <linux/kthread.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 bool disable_cfc;
static bool l2cap_ertm;
static int channel_mtu = -1;
static unsigned int l2cap_mtu = RFCOMM_MAX_L2CAP_MTU;
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 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,
u8 sec_level,
int *err);
static struct rfcomm_session *rfcomm_session_get(bdaddr_t *src, bdaddr_t *dst);
static struct rfcomm_session *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 void rfcomm_schedule(void)
{
if (!rfcomm_thread)
return;
wake_up_process(rfcomm_thread);
}
/* ---- 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();
}
static void rfcomm_l2data_ready(struct sock *sk, int bytes)
{
BT_DBG("%p bytes %d", sk, bytes);
rfcomm_schedule();
}
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 int rfcomm_check_security(struct rfcomm_dlc *d)
{
struct sock *sk = d->session->sock->sk;
struct l2cap_conn *conn = l2cap_pi(sk)->chan->conn;
__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(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();
}
static void rfcomm_session_set_timer(struct rfcomm_session *s, long timeout)
{
BT_DBG("session %p state %ld timeout %ld", s, s->state, timeout);
Bluetooth: Remove RFCOMM session refcnt Previous commits have improved the handling of the RFCOMM session timer and the RFCOMM session pointers such that freed RFCOMM session structures should no longer be erroneously accessed. The RFCOMM session refcnt now has no purpose and will be deleted by this commit. Note that the RFCOMM session is now deleted as soon as the RFCOMM control channel link is no longer required. This makes the lifetime of the RFCOMM session deterministic and absolute. Previously with the refcnt, there was uncertainty about when the session structure would be deleted because the relative refcnt prevented the session structure from being deleted at will. It was noted that the refcnt could malfunction under very heavy real-time processor loading in embedded SMP environments. This could cause premature RFCOMM session deletion or double session deletion that could result in kernel crashes. Removal of the refcnt prevents this issue. There are 4 connection / disconnection RFCOMM session scenarios: host initiated control link ---> host disconnected control link host initiated ctrl link ---> remote device disconnected ctrl link remote device initiated ctrl link ---> host disconnected ctrl link remote device initiated ctrl link ---> remote device disc'ed ctrl link The control channel connection procedures are independent of the disconnection procedures. Strangely, the RFCOMM session refcnt was applying special treatment so erroneously combining connection and disconnection events. This commit fixes this issue by removing some session code that used the "initiator" member of the session structure that was intended for use with the data channels. Signed-off-by: Dean Jenkins <Dean_Jenkins@mentor.com> Acked-by: Marcel Holtmann <marcel@holtmann.org> Signed-off-by: Gustavo Padovan <gustavo.padovan@collabora.co.uk>
2013-02-28 18:21:56 +04:00
mod_timer(&s->timer, jiffies + timeout);
}
static void rfcomm_session_clear_timer(struct rfcomm_session *s)
{
BT_DBG("session %p state %ld", s, s->state);
Bluetooth: Remove RFCOMM session refcnt Previous commits have improved the handling of the RFCOMM session timer and the RFCOMM session pointers such that freed RFCOMM session structures should no longer be erroneously accessed. The RFCOMM session refcnt now has no purpose and will be deleted by this commit. Note that the RFCOMM session is now deleted as soon as the RFCOMM control channel link is no longer required. This makes the lifetime of the RFCOMM session deterministic and absolute. Previously with the refcnt, there was uncertainty about when the session structure would be deleted because the relative refcnt prevented the session structure from being deleted at will. It was noted that the refcnt could malfunction under very heavy real-time processor loading in embedded SMP environments. This could cause premature RFCOMM session deletion or double session deletion that could result in kernel crashes. Removal of the refcnt prevents this issue. There are 4 connection / disconnection RFCOMM session scenarios: host initiated control link ---> host disconnected control link host initiated ctrl link ---> remote device disconnected ctrl link remote device initiated ctrl link ---> host disconnected ctrl link remote device initiated ctrl link ---> remote device disc'ed ctrl link The control channel connection procedures are independent of the disconnection procedures. Strangely, the RFCOMM session refcnt was applying special treatment so erroneously combining connection and disconnection events. This commit fixes this issue by removing some session code that used the "initiator" member of the session structure that was intended for use with the data channels. Signed-off-by: Dean Jenkins <Dean_Jenkins@mentor.com> Acked-by: Marcel Holtmann <marcel@holtmann.org> Signed-off-by: Gustavo Padovan <gustavo.padovan@collabora.co.uk>
2013-02-28 18:21:56 +04:00
del_timer_sync(&s->timer);
}
/* ---- 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();
}
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 (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->sec_level = BT_SECURITY_LOW;
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_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);
}
static struct rfcomm_dlc *rfcomm_dlc_get(struct rfcomm_session *s, u8 dlci)
{
struct rfcomm_dlc *d;
list_for_each_entry(d, &s->dlcs, 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 %pMR -> %pMR channel %d",
d, d->state, src, 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, d->sec_level, &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);
Bluetooth: Add enhanced security model for Simple Pairing The current security model is based around the flags AUTH, ENCRYPT and SECURE. Starting with support for the Bluetooth 2.1 specification this is no longer sufficient. The different security levels are now defined as SDP, LOW, MEDIUM and SECURE. Previously it was possible to set each security independently, but this actually doesn't make a lot of sense. For Bluetooth the encryption depends on a previous successful authentication. Also you can only update your existing link key if you successfully created at least one before. And of course the update of link keys without having proper encryption in place is a security issue. The new security levels from the Bluetooth 2.1 specification are now used internally. All old settings are mapped to the new values and this way it ensures that old applications still work. The only limitation is that it is no longer possible to set authentication without also enabling encryption. No application should have done this anyway since this is actually a security issue. Without encryption the integrity of the authentication can't be guaranteed. As default for a new L2CAP or RFCOMM connection, the LOW security level is used. The only exception here are the service discovery sessions on PSM 1 where SDP level is used. To have similar security strength as with a Bluetooth 2.0 and before combination key, the MEDIUM level should be used. This is according to the Bluetooth specification. The MEDIUM level will not require any kind of man-in-the-middle (MITM) protection. Only the HIGH security level will require this. Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
2009-01-15 23:58:04 +03:00
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();
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();
break;
}
/* Fall through */
default:
rfcomm_dlc_clear_timer(d);
rfcomm_dlc_lock(d);
d->state = BT_CLOSED;
bluetooth : __rfcomm_dlc_close lock fix Lockdep warning will be trigged while rfcomm connection closing. The locks taken in rfcomm_dev_add: rfcomm_dev_lock --> d->lock In __rfcomm_dlc_close: d->lock --> rfcomm_dev_lock (in rfcomm_dev_state_change) There's two way to fix it, one is in rfcomm_dev_add we first locking d->lock then the rfcomm_dev_lock The other (in this patch), remove the locking of d->lock for rfcomm_dev_state_change because just locking "d->state = BT_CLOSED;" is enough. [ 295.002046] ======================================================= [ 295.002046] [ INFO: possible circular locking dependency detected ] [ 295.002046] 2.6.25-rc7 #1 [ 295.002046] ------------------------------------------------------- [ 295.002046] krfcommd/2705 is trying to acquire lock: [ 295.002046] (rfcomm_dev_lock){-.--}, at: [<f89a090a>] rfcomm_dev_state_change+0x6a/0xd0 [rfcomm] [ 295.002046] [ 295.002046] but task is already holding lock: [ 295.002046] (&d->lock){--..}, at: [<f899c533>] __rfcomm_dlc_close+0x43/0xd0 [rfcomm] [ 295.002046] [ 295.002046] which lock already depends on the new lock. [ 295.002046] [ 295.002046] [ 295.002046] the existing dependency chain (in reverse order) is: [ 295.002046] [ 295.002046] -> #1 (&d->lock){--..}: [ 295.002046] [<c0149b23>] check_prev_add+0xd3/0x200 [ 295.002046] [<c0149ce5>] check_prevs_add+0x95/0xe0 [ 295.002046] [<c0149f6f>] validate_chain+0x23f/0x320 [ 295.002046] [<c014b7b1>] __lock_acquire+0x1c1/0x760 [ 295.002046] [<c014c349>] lock_acquire+0x79/0xb0 [ 295.002046] [<c03d6b99>] _spin_lock+0x39/0x80 [ 295.002046] [<f89a01c0>] rfcomm_dev_add+0x240/0x360 [rfcomm] [ 295.002046] [<f89a047e>] rfcomm_create_dev+0x6e/0xe0 [rfcomm] [ 295.002046] [<f89a0823>] rfcomm_dev_ioctl+0x33/0x60 [rfcomm] [ 295.002046] [<f899facc>] rfcomm_sock_ioctl+0x2c/0x50 [rfcomm] [ 295.002046] [<c0363d38>] sock_ioctl+0x118/0x240 [ 295.002046] [<c0194196>] vfs_ioctl+0x76/0x90 [ 295.002046] [<c0194446>] do_vfs_ioctl+0x56/0x140 [ 295.002046] [<c0194569>] sys_ioctl+0x39/0x60 [ 295.002046] [<c0104faa>] syscall_call+0x7/0xb [ 295.002046] [<ffffffff>] 0xffffffff [ 295.002046] [ 295.002046] -> #0 (rfcomm_dev_lock){-.--}: [ 295.002046] [<c0149a84>] check_prev_add+0x34/0x200 [ 295.002046] [<c0149ce5>] check_prevs_add+0x95/0xe0 [ 295.002046] [<c0149f6f>] validate_chain+0x23f/0x320 [ 295.002046] [<c014b7b1>] __lock_acquire+0x1c1/0x760 [ 295.002046] [<c014c349>] lock_acquire+0x79/0xb0 [ 295.002046] [<c03d6639>] _read_lock+0x39/0x80 [ 295.002046] [<f89a090a>] rfcomm_dev_state_change+0x6a/0xd0 [rfcomm] [ 295.002046] [<f899c548>] __rfcomm_dlc_close+0x58/0xd0 [rfcomm] [ 295.002046] [<f899d44f>] rfcomm_recv_ua+0x6f/0x120 [rfcomm] [ 295.002046] [<f899e061>] rfcomm_recv_frame+0x171/0x1e0 [rfcomm] [ 295.002046] [<f899e357>] rfcomm_run+0xe7/0x550 [rfcomm] [ 295.002046] [<c013c18c>] kthread+0x5c/0xa0 [ 295.002046] [<c0105c07>] kernel_thread_helper+0x7/0x10 [ 295.002046] [<ffffffff>] 0xffffffff [ 295.002046] [ 295.002046] other info that might help us debug this: [ 295.002046] [ 295.002046] 2 locks held by krfcommd/2705: [ 295.002046] #0: (rfcomm_mutex){--..}, at: [<f899e2eb>] rfcomm_run+0x7b/0x550 [rfcomm] [ 295.002046] #1: (&d->lock){--..}, at: [<f899c533>] __rfcomm_dlc_close+0x43/0xd0 [rfcomm] [ 295.002046] [ 295.002046] stack backtrace: [ 295.002046] Pid: 2705, comm: krfcommd Not tainted 2.6.25-rc7 #1 [ 295.002046] [<c0128a38>] ? printk+0x18/0x20 [ 295.002046] [<c014927f>] print_circular_bug_tail+0x6f/0x80 [ 295.002046] [<c0149a84>] check_prev_add+0x34/0x200 [ 295.002046] [<c0149ce5>] check_prevs_add+0x95/0xe0 [ 295.002046] [<c0149f6f>] validate_chain+0x23f/0x320 [ 295.002046] [<c014b7b1>] __lock_acquire+0x1c1/0x760 [ 295.002046] [<c014c349>] lock_acquire+0x79/0xb0 [ 295.002046] [<f89a090a>] ? rfcomm_dev_state_change+0x6a/0xd0 [rfcomm] [ 295.002046] [<c03d6639>] _read_lock+0x39/0x80 [ 295.002046] [<f89a090a>] ? rfcomm_dev_state_change+0x6a/0xd0 [rfcomm] [ 295.002046] [<f89a090a>] rfcomm_dev_state_change+0x6a/0xd0 [rfcomm] [ 295.002046] [<f899c548>] __rfcomm_dlc_close+0x58/0xd0 [rfcomm] [ 295.002046] [<f899d44f>] rfcomm_recv_ua+0x6f/0x120 [rfcomm] [ 295.002046] [<f899e061>] rfcomm_recv_frame+0x171/0x1e0 [rfcomm] [ 295.002046] [<c014abd9>] ? trace_hardirqs_on+0xb9/0x130 [ 295.002046] [<c03d6e89>] ? _spin_unlock_irqrestore+0x39/0x70 [ 295.002046] [<f899e357>] rfcomm_run+0xe7/0x550 [rfcomm] [ 295.002046] [<c03d4559>] ? __sched_text_start+0x229/0x4c0 [ 295.002046] [<c0120000>] ? cpu_avg_load_per_task+0x20/0x30 [ 295.002046] [<f899e270>] ? rfcomm_run+0x0/0x550 [rfcomm] [ 295.002046] [<c013c18c>] kthread+0x5c/0xa0 [ 295.002046] [<c013c130>] ? kthread+0x0/0xa0 [ 295.002046] [<c0105c07>] kernel_thread_helper+0x7/0x10 [ 295.002046] ======================= Signed-off-by: Dave Young <hidave.darkstar@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2008-04-02 10:59:06 +04:00
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 = 0;
struct rfcomm_dlc *d_list;
struct rfcomm_session *s, *s_list;
BT_DBG("dlc %p state %ld dlci %d err %d", d, d->state, d->dlci, err);
rfcomm_lock();
s = d->session;
if (!s)
goto no_session;
/* after waiting on the mutex check the session still exists
* then check the dlc still exists
*/
list_for_each_entry(s_list, &session_list, list) {
if (s_list == s) {
list_for_each_entry(d_list, &s->dlcs, list) {
if (d_list == d) {
r = __rfcomm_dlc_close(d, err);
break;
}
}
break;
}
}
no_session:
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();
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();
}
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();
}
/*
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();
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 struct rfcomm_session *rfcomm_session_del(struct rfcomm_session *s)
{
int state = s->state;
BT_DBG("session %p state %ld", s, s->state);
list_del(&s->list);
rfcomm_session_clear_timer(s);
sock_release(s->sock);
kfree(s);
if (state != BT_LISTEN)
module_put(THIS_MODULE);
return NULL;
}
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 struct rfcomm_session *rfcomm_session_close(struct rfcomm_session *s,
int err)
{
struct rfcomm_dlc *d;
struct list_head *p, *n;
s->state = BT_CLOSED;
BT_DBG("session %p state %ld err %d", s, s->state, err);
/* 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);
Bluetooth: Remove RFCOMM session refcnt Previous commits have improved the handling of the RFCOMM session timer and the RFCOMM session pointers such that freed RFCOMM session structures should no longer be erroneously accessed. The RFCOMM session refcnt now has no purpose and will be deleted by this commit. Note that the RFCOMM session is now deleted as soon as the RFCOMM control channel link is no longer required. This makes the lifetime of the RFCOMM session deterministic and absolute. Previously with the refcnt, there was uncertainty about when the session structure would be deleted because the relative refcnt prevented the session structure from being deleted at will. It was noted that the refcnt could malfunction under very heavy real-time processor loading in embedded SMP environments. This could cause premature RFCOMM session deletion or double session deletion that could result in kernel crashes. Removal of the refcnt prevents this issue. There are 4 connection / disconnection RFCOMM session scenarios: host initiated control link ---> host disconnected control link host initiated ctrl link ---> remote device disconnected ctrl link remote device initiated ctrl link ---> host disconnected ctrl link remote device initiated ctrl link ---> remote device disc'ed ctrl link The control channel connection procedures are independent of the disconnection procedures. Strangely, the RFCOMM session refcnt was applying special treatment so erroneously combining connection and disconnection events. This commit fixes this issue by removing some session code that used the "initiator" member of the session structure that was intended for use with the data channels. Signed-off-by: Dean Jenkins <Dean_Jenkins@mentor.com> Acked-by: Marcel Holtmann <marcel@holtmann.org> Signed-off-by: Gustavo Padovan <gustavo.padovan@collabora.co.uk>
2013-02-28 18:21:56 +04:00
return rfcomm_session_del(s);
}
static struct rfcomm_session *rfcomm_session_create(bdaddr_t *src,
bdaddr_t *dst,
u8 sec_level,
int *err)
{
struct rfcomm_session *s = NULL;
struct sockaddr_l2 addr;
struct socket *sock;
struct sock *sk;
BT_DBG("%pMR -> %pMR", src, 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)->chan->imtu = l2cap_mtu;
l2cap_pi(sk)->chan->sec_level = sec_level;
if (l2cap_ertm)
l2cap_pi(sk)->chan->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 = __constant_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;
return rfcomm_session_del(s);
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 kvec iv = { data, len };
struct msghdr msg;
BT_DBG("session %p len %d", s, len);
memset(&msg, 0, sizeof(msg));
return kernel_sendmsg(s->sock, &msg, &iv, 1, len);
}
static int rfcomm_send_cmd(struct rfcomm_session *s, struct rfcomm_cmd *cmd)
{
BT_DBG("%p cmd %u", s, cmd->ctrl);
return rfcomm_send_frame(s, (void *) cmd, sizeof(*cmd));
}
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_cmd(s, &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_cmd(s, &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_cmd(s, &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();
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_cmd(s, &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 struct rfcomm_session *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 s;
}
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);
rfcomm_session_clear_timer(s);
}
break;
}
} else {
/* Control channel */
switch (s->state) {
case BT_CONNECT:
s->state = BT_CONNECTED;
rfcomm_process_connect(s);
break;
case BT_DISCONN:
s = rfcomm_session_close(s, ECONNRESET);
break;
}
}
return s;
}
static struct rfcomm_session *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 = rfcomm_session_close(s, err);
}
return s;
}
static struct rfcomm_session *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 = rfcomm_session_close(s, err);
}
return s;
}
void rfcomm_dlc_accept(struct rfcomm_dlc *d)
{
struct sock *sk = d->session->sock->sk;
struct l2cap_conn *conn = l2cap_pi(sk)->chan->conn;
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(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);
Bluetooth: Add enhanced security model for Simple Pairing The current security model is based around the flags AUTH, ENCRYPT and SECURE. Starting with support for the Bluetooth 2.1 specification this is no longer sufficient. The different security levels are now defined as SDP, LOW, MEDIUM and SECURE. Previously it was possible to set each security independently, but this actually doesn't make a lot of sense. For Bluetooth the encryption depends on a previous successful authentication. Also you can only update your existing link key if you successfully created at least one before. And of course the update of link keys without having proper encryption in place is a security issue. The new security levels from the Bluetooth 2.1 specification are now used internally. All old settings are mapped to the new values and this way it ensures that old applications still work. The only limitation is that it is no longer possible to set authentication without also enabling encryption. No application should have done this anyway since this is actually a security issue. Without encryption the integrity of the authentication can't be guaranteed. As default for a new L2CAP or RFCOMM connection, the LOW security level is used. The only exception here are the service discovery sessions on PSM 1 where SDP level is used. To have similar security strength as with a Bluetooth 2.0 and before combination key, the MEDIUM level should be used. This is according to the Bluetooth specification. The MEDIUM level will not require any kind of man-in-the-middle (MITM) protection. Only the HIGH security level will require this. Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
2009-01-15 23:58:04 +03:00
} 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 (according to ETSI TS 07.10) settings */
bit_rate = RFCOMM_RPN_BR_9600;
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_230400) {
BT_DBG("RPN bit rate mismatch 0x%x", bit_rate);
bit_rate = RFCOMM_RPN_BR_9600;
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 struct rfcomm_session *rfcomm_recv_frame(struct rfcomm_session *s,
struct sk_buff *skb)
{
struct rfcomm_hdr *hdr = (void *) skb->data;
u8 type, dlci, fcs;
if (!s) {
/* no session, so free socket data */
kfree_skb(skb);
return s;
}
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 s;
}
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))
s = rfcomm_recv_disc(s, dlci);
break;
case RFCOMM_UA:
if (__test_pf(hdr->ctrl))
s = rfcomm_recv_ua(s, dlci);
break;
case RFCOMM_DM:
s = rfcomm_recv_dm(s, dlci);
break;
case RFCOMM_UIH:
if (dlci) {
rfcomm_recv_data(s, dlci, __test_pf(hdr->ctrl), skb);
return s;
}
rfcomm_recv_mcc(s, skb);
break;
default:
BT_ERR("Unknown packet type 0x%02x", type);
break;
}
kfree_skb(skb);
return s;
}
/* ---- 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)) {
Bluetooth: Add enhanced security model for Simple Pairing The current security model is based around the flags AUTH, ENCRYPT and SECURE. Starting with support for the Bluetooth 2.1 specification this is no longer sufficient. The different security levels are now defined as SDP, LOW, MEDIUM and SECURE. Previously it was possible to set each security independently, but this actually doesn't make a lot of sense. For Bluetooth the encryption depends on a previous successful authentication. Also you can only update your existing link key if you successfully created at least one before. And of course the update of link keys without having proper encryption in place is a security issue. The new security levels from the Bluetooth 2.1 specification are now used internally. All old settings are mapped to the new values and this way it ensures that old applications still work. The only limitation is that it is no longer possible to set authentication without also enabling encryption. No application should have done this anyway since this is actually a security issue. Without encryption the integrity of the authentication can't be guaranteed. As default for a new L2CAP or RFCOMM connection, the LOW security level is used. The only exception here are the service discovery sessions on PSM 1 where SDP level is used. To have similar security strength as with a Bluetooth 2.0 and before combination key, the MEDIUM level should be used. This is according to the Bluetooth specification. The MEDIUM level will not require any kind of man-in-the-middle (MITM) protection. Only the HIGH security level will require this. Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
2009-01-15 23:58:04 +03:00
rfcomm_send_pn(s, 1, d);
} else {
set_bit(RFCOMM_AUTH_PENDING, &d->flags);
rfcomm_dlc_set_timer(d, RFCOMM_AUTH_TIMEOUT);
Bluetooth: Add enhanced security model for Simple Pairing The current security model is based around the flags AUTH, ENCRYPT and SECURE. Starting with support for the Bluetooth 2.1 specification this is no longer sufficient. The different security levels are now defined as SDP, LOW, MEDIUM and SECURE. Previously it was possible to set each security independently, but this actually doesn't make a lot of sense. For Bluetooth the encryption depends on a previous successful authentication. Also you can only update your existing link key if you successfully created at least one before. And of course the update of link keys without having proper encryption in place is a security issue. The new security levels from the Bluetooth 2.1 specification are now used internally. All old settings are mapped to the new values and this way it ensures that old applications still work. The only limitation is that it is no longer possible to set authentication without also enabling encryption. No application should have done this anyway since this is actually a security issue. Without encryption the integrity of the authentication can't be guaranteed. As default for a new L2CAP or RFCOMM connection, the LOW security level is used. The only exception here are the service discovery sessions on PSM 1 where SDP level is used. To have similar security strength as with a Bluetooth 2.0 and before combination key, the MEDIUM level should be used. This is according to the Bluetooth specification. The MEDIUM level will not require any kind of man-in-the-middle (MITM) protection. Only the HIGH security level will require this. Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
2009-01-15 23:58:04 +03:00
}
}
}
}
/* Send data queued for the DLC.
* Return number of frames left in the queue.
*/
static 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 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;
}
Bluetooth: rfcomm: Fix sleep in invalid context in rfcomm_security_cfm This was triggered by turning off encryption on ACL link when rfcomm was using high security. rfcomm_security_cfm (which is called from rx task) was closing DLC and this involves sending disconnect message (and locking socket). Move closing DLC to rfcomm_process_dlcs and only flag DLC for closure in rfcomm_security_cfm. BUG: sleeping function called from invalid context at net/core/sock.c:2032 in_atomic(): 1, irqs_disabled(): 0, pid: 1788, name: kworker/0:3 [<c0068a08>] (unwind_backtrace+0x0/0x108) from [<c05e25dc>] (dump_stack+0x20/0x24) [<c05e25dc>] (dump_stack+0x20/0x24) from [<c0087ba8>] (__might_sleep+0x110/0x12c) [<c0087ba8>] (__might_sleep+0x110/0x12c) from [<c04801d8>] (lock_sock_nested+0x2c/0x64) [<c04801d8>] (lock_sock_nested+0x2c/0x64) from [<c05670c8>] (l2cap_sock_sendmsg+0x58/0xcc) [<c05670c8>] (l2cap_sock_sendmsg+0x58/0xcc) from [<c047cf6c>] (sock_sendmsg+0xb0/0xd0) [<c047cf6c>] (sock_sendmsg+0xb0/0xd0) from [<c047cfc8>] (kernel_sendmsg+0x3c/0x44) [<c047cfc8>] (kernel_sendmsg+0x3c/0x44) from [<c056b0e8>] (rfcomm_send_frame+0x50/0x58) [<c056b0e8>] (rfcomm_send_frame+0x50/0x58) from [<c056b168>] (rfcomm_send_disc+0x78/0x80) [<c056b168>] (rfcomm_send_disc+0x78/0x80) from [<c056b9f4>] (__rfcomm_dlc_close+0x2d0/0x2fc) [<c056b9f4>] (__rfcomm_dlc_close+0x2d0/0x2fc) from [<c056bbac>] (rfcomm_security_cfm+0x140/0x1e0) [<c056bbac>] (rfcomm_security_cfm+0x140/0x1e0) from [<c0555ec0>] (hci_event_packet+0x1ce8/0x4d84) [<c0555ec0>] (hci_event_packet+0x1ce8/0x4d84) from [<c0550380>] (hci_rx_task+0x1d0/0x2d0) [<c0550380>] (hci_rx_task+0x1d0/0x2d0) from [<c009ee04>] (tasklet_action+0x138/0x1e4) [<c009ee04>] (tasklet_action+0x138/0x1e4) from [<c009f21c>] (__do_softirq+0xcc/0x274) [<c009f21c>] (__do_softirq+0xcc/0x274) from [<c009f6c0>] (do_softirq+0x60/0x6c) [<c009f6c0>] (do_softirq+0x60/0x6c) from [<c009f794>] (local_bh_enable_ip+0xc8/0xd4) [<c009f794>] (local_bh_enable_ip+0xc8/0xd4) from [<c05e5804>] (_raw_spin_unlock_bh+0x48/0x4c) [<c05e5804>] (_raw_spin_unlock_bh+0x48/0x4c) from [<c040d470>] (data_from_chip+0xf4/0xaec) [<c040d470>] (data_from_chip+0xf4/0xaec) from [<c04136c0>] (send_skb_to_core+0x40/0x178) [<c04136c0>] (send_skb_to_core+0x40/0x178) from [<c04139f4>] (cg2900_hu_receive+0x15c/0x2d0) [<c04139f4>] (cg2900_hu_receive+0x15c/0x2d0) from [<c0414cb8>] (hci_uart_tty_receive+0x74/0xa0) [<c0414cb8>] (hci_uart_tty_receive+0x74/0xa0) from [<c02cbd9c>] (flush_to_ldisc+0x188/0x198) [<c02cbd9c>] (flush_to_ldisc+0x188/0x198) from [<c00b2774>] (process_one_work+0x144/0x4b8) [<c00b2774>] (process_one_work+0x144/0x4b8) from [<c00b2e8c>] (worker_thread+0x198/0x468) [<c00b2e8c>] (worker_thread+0x198/0x468) from [<c00b9bc8>] (kthread+0x98/0xa0) [<c00b9bc8>] (kthread+0x98/0xa0) from [<c0061744>] (kernel_thread_exit+0x0/0x8) Signed-off-by: Szymon Janc <szymon.janc@tieto.com> Signed-off-by: Gustavo F. Padovan <padovan@profusion.mobi>
2011-09-26 16:19:47 +04:00
if (test_bit(RFCOMM_ENC_DROP, &d->flags)) {
__rfcomm_dlc_close(d, ECONNREFUSED);
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 struct rfcomm_session *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);
if (!skb_linearize(skb))
s = rfcomm_recv_frame(s, skb);
else
kfree_skb(skb);
}
Bluetooth: Remove RFCOMM session refcnt Previous commits have improved the handling of the RFCOMM session timer and the RFCOMM session pointers such that freed RFCOMM session structures should no longer be erroneously accessed. The RFCOMM session refcnt now has no purpose and will be deleted by this commit. Note that the RFCOMM session is now deleted as soon as the RFCOMM control channel link is no longer required. This makes the lifetime of the RFCOMM session deterministic and absolute. Previously with the refcnt, there was uncertainty about when the session structure would be deleted because the relative refcnt prevented the session structure from being deleted at will. It was noted that the refcnt could malfunction under very heavy real-time processor loading in embedded SMP environments. This could cause premature RFCOMM session deletion or double session deletion that could result in kernel crashes. Removal of the refcnt prevents this issue. There are 4 connection / disconnection RFCOMM session scenarios: host initiated control link ---> host disconnected control link host initiated ctrl link ---> remote device disconnected ctrl link remote device initiated ctrl link ---> host disconnected ctrl link remote device initiated ctrl link ---> remote device disc'ed ctrl link The control channel connection procedures are independent of the disconnection procedures. Strangely, the RFCOMM session refcnt was applying special treatment so erroneously combining connection and disconnection events. This commit fixes this issue by removing some session code that used the "initiator" member of the session structure that was intended for use with the data channels. Signed-off-by: Dean Jenkins <Dean_Jenkins@mentor.com> Acked-by: Marcel Holtmann <marcel@holtmann.org> Signed-off-by: Gustavo Padovan <gustavo.padovan@collabora.co.uk>
2013-02-28 18:21:56 +04:00
if (s && (sk->sk_state == BT_CLOSED))
s = rfcomm_session_close(s, sk->sk_err);
return s;
}
static 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) {
/* We should adjust MTU on incoming sessions.
* L2CAP MTU minus UIH header and FCS. */
s->mtu = min(l2cap_pi(nsock->sk)->chan->omtu,
l2cap_pi(nsock->sk)->chan->imtu) - 5;
rfcomm_schedule();
} else
sock_release(nsock);
}
static struct rfcomm_session *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)->chan->omtu, l2cap_pi(sk)->chan->imtu) - 5;
rfcomm_send_sabm(s, 0);
break;
case BT_CLOSED:
s = rfcomm_session_close(s, sk->sk_err);
break;
}
return s;
}
static 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);
continue;
}
if (s->state == BT_LISTEN) {
rfcomm_accept_connection(s);
continue;
}
switch (s->state) {
case BT_BOUND:
s = rfcomm_check_connection(s);
break;
default:
s = rfcomm_process_rx(s);
break;
}
if (s)
rfcomm_process_dlcs(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 = __constant_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)->chan->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) {
err = -ENOMEM;
goto failed;
}
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 (1) {
set_current_state(TASK_INTERRUPTIBLE);
if (kthread_should_stop())
break;
/* Process stuff */
rfcomm_process_sessions();
schedule();
}
__set_current_state(TASK_RUNNING);
rfcomm_kill_listener();
return 0;
}
Bluetooth: Add enhanced security model for Simple Pairing The current security model is based around the flags AUTH, ENCRYPT and SECURE. Starting with support for the Bluetooth 2.1 specification this is no longer sufficient. The different security levels are now defined as SDP, LOW, MEDIUM and SECURE. Previously it was possible to set each security independently, but this actually doesn't make a lot of sense. For Bluetooth the encryption depends on a previous successful authentication. Also you can only update your existing link key if you successfully created at least one before. And of course the update of link keys without having proper encryption in place is a security issue. The new security levels from the Bluetooth 2.1 specification are now used internally. All old settings are mapped to the new values and this way it ensures that old applications still work. The only limitation is that it is no longer possible to set authentication without also enabling encryption. No application should have done this anyway since this is actually a security issue. Without encryption the integrity of the authentication can't be guaranteed. As default for a new L2CAP or RFCOMM connection, the LOW security level is used. The only exception here are the service discovery sessions on PSM 1 where SDP level is used. To have similar security strength as with a Bluetooth 2.0 and before combination key, the MEDIUM level should be used. This is according to the Bluetooth specification. The MEDIUM level will not require any kind of man-in-the-middle (MITM) protection. Only the HIGH security level will require this. Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
2009-01-15 23:58:04 +03:00
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;
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) {
Bluetooth: rfcomm: Fix sleep in invalid context in rfcomm_security_cfm This was triggered by turning off encryption on ACL link when rfcomm was using high security. rfcomm_security_cfm (which is called from rx task) was closing DLC and this involves sending disconnect message (and locking socket). Move closing DLC to rfcomm_process_dlcs and only flag DLC for closure in rfcomm_security_cfm. BUG: sleeping function called from invalid context at net/core/sock.c:2032 in_atomic(): 1, irqs_disabled(): 0, pid: 1788, name: kworker/0:3 [<c0068a08>] (unwind_backtrace+0x0/0x108) from [<c05e25dc>] (dump_stack+0x20/0x24) [<c05e25dc>] (dump_stack+0x20/0x24) from [<c0087ba8>] (__might_sleep+0x110/0x12c) [<c0087ba8>] (__might_sleep+0x110/0x12c) from [<c04801d8>] (lock_sock_nested+0x2c/0x64) [<c04801d8>] (lock_sock_nested+0x2c/0x64) from [<c05670c8>] (l2cap_sock_sendmsg+0x58/0xcc) [<c05670c8>] (l2cap_sock_sendmsg+0x58/0xcc) from [<c047cf6c>] (sock_sendmsg+0xb0/0xd0) [<c047cf6c>] (sock_sendmsg+0xb0/0xd0) from [<c047cfc8>] (kernel_sendmsg+0x3c/0x44) [<c047cfc8>] (kernel_sendmsg+0x3c/0x44) from [<c056b0e8>] (rfcomm_send_frame+0x50/0x58) [<c056b0e8>] (rfcomm_send_frame+0x50/0x58) from [<c056b168>] (rfcomm_send_disc+0x78/0x80) [<c056b168>] (rfcomm_send_disc+0x78/0x80) from [<c056b9f4>] (__rfcomm_dlc_close+0x2d0/0x2fc) [<c056b9f4>] (__rfcomm_dlc_close+0x2d0/0x2fc) from [<c056bbac>] (rfcomm_security_cfm+0x140/0x1e0) [<c056bbac>] (rfcomm_security_cfm+0x140/0x1e0) from [<c0555ec0>] (hci_event_packet+0x1ce8/0x4d84) [<c0555ec0>] (hci_event_packet+0x1ce8/0x4d84) from [<c0550380>] (hci_rx_task+0x1d0/0x2d0) [<c0550380>] (hci_rx_task+0x1d0/0x2d0) from [<c009ee04>] (tasklet_action+0x138/0x1e4) [<c009ee04>] (tasklet_action+0x138/0x1e4) from [<c009f21c>] (__do_softirq+0xcc/0x274) [<c009f21c>] (__do_softirq+0xcc/0x274) from [<c009f6c0>] (do_softirq+0x60/0x6c) [<c009f6c0>] (do_softirq+0x60/0x6c) from [<c009f794>] (local_bh_enable_ip+0xc8/0xd4) [<c009f794>] (local_bh_enable_ip+0xc8/0xd4) from [<c05e5804>] (_raw_spin_unlock_bh+0x48/0x4c) [<c05e5804>] (_raw_spin_unlock_bh+0x48/0x4c) from [<c040d470>] (data_from_chip+0xf4/0xaec) [<c040d470>] (data_from_chip+0xf4/0xaec) from [<c04136c0>] (send_skb_to_core+0x40/0x178) [<c04136c0>] (send_skb_to_core+0x40/0x178) from [<c04139f4>] (cg2900_hu_receive+0x15c/0x2d0) [<c04139f4>] (cg2900_hu_receive+0x15c/0x2d0) from [<c0414cb8>] (hci_uart_tty_receive+0x74/0xa0) [<c0414cb8>] (hci_uart_tty_receive+0x74/0xa0) from [<c02cbd9c>] (flush_to_ldisc+0x188/0x198) [<c02cbd9c>] (flush_to_ldisc+0x188/0x198) from [<c00b2774>] (process_one_work+0x144/0x4b8) [<c00b2774>] (process_one_work+0x144/0x4b8) from [<c00b2e8c>] (worker_thread+0x198/0x468) [<c00b2e8c>] (worker_thread+0x198/0x468) from [<c00b9bc8>] (kthread+0x98/0xa0) [<c00b9bc8>] (kthread+0x98/0xa0) from [<c0061744>] (kernel_thread_exit+0x0/0x8) Signed-off-by: Szymon Janc <szymon.janc@tieto.com> Signed-off-by: Gustavo F. Padovan <padovan@profusion.mobi>
2011-09-26 16:19:47 +04:00
set_bit(RFCOMM_ENC_DROP, &d->flags);
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) {
Bluetooth: rfcomm: Fix sleep in invalid context in rfcomm_security_cfm This was triggered by turning off encryption on ACL link when rfcomm was using high security. rfcomm_security_cfm (which is called from rx task) was closing DLC and this involves sending disconnect message (and locking socket). Move closing DLC to rfcomm_process_dlcs and only flag DLC for closure in rfcomm_security_cfm. BUG: sleeping function called from invalid context at net/core/sock.c:2032 in_atomic(): 1, irqs_disabled(): 0, pid: 1788, name: kworker/0:3 [<c0068a08>] (unwind_backtrace+0x0/0x108) from [<c05e25dc>] (dump_stack+0x20/0x24) [<c05e25dc>] (dump_stack+0x20/0x24) from [<c0087ba8>] (__might_sleep+0x110/0x12c) [<c0087ba8>] (__might_sleep+0x110/0x12c) from [<c04801d8>] (lock_sock_nested+0x2c/0x64) [<c04801d8>] (lock_sock_nested+0x2c/0x64) from [<c05670c8>] (l2cap_sock_sendmsg+0x58/0xcc) [<c05670c8>] (l2cap_sock_sendmsg+0x58/0xcc) from [<c047cf6c>] (sock_sendmsg+0xb0/0xd0) [<c047cf6c>] (sock_sendmsg+0xb0/0xd0) from [<c047cfc8>] (kernel_sendmsg+0x3c/0x44) [<c047cfc8>] (kernel_sendmsg+0x3c/0x44) from [<c056b0e8>] (rfcomm_send_frame+0x50/0x58) [<c056b0e8>] (rfcomm_send_frame+0x50/0x58) from [<c056b168>] (rfcomm_send_disc+0x78/0x80) [<c056b168>] (rfcomm_send_disc+0x78/0x80) from [<c056b9f4>] (__rfcomm_dlc_close+0x2d0/0x2fc) [<c056b9f4>] (__rfcomm_dlc_close+0x2d0/0x2fc) from [<c056bbac>] (rfcomm_security_cfm+0x140/0x1e0) [<c056bbac>] (rfcomm_security_cfm+0x140/0x1e0) from [<c0555ec0>] (hci_event_packet+0x1ce8/0x4d84) [<c0555ec0>] (hci_event_packet+0x1ce8/0x4d84) from [<c0550380>] (hci_rx_task+0x1d0/0x2d0) [<c0550380>] (hci_rx_task+0x1d0/0x2d0) from [<c009ee04>] (tasklet_action+0x138/0x1e4) [<c009ee04>] (tasklet_action+0x138/0x1e4) from [<c009f21c>] (__do_softirq+0xcc/0x274) [<c009f21c>] (__do_softirq+0xcc/0x274) from [<c009f6c0>] (do_softirq+0x60/0x6c) [<c009f6c0>] (do_softirq+0x60/0x6c) from [<c009f794>] (local_bh_enable_ip+0xc8/0xd4) [<c009f794>] (local_bh_enable_ip+0xc8/0xd4) from [<c05e5804>] (_raw_spin_unlock_bh+0x48/0x4c) [<c05e5804>] (_raw_spin_unlock_bh+0x48/0x4c) from [<c040d470>] (data_from_chip+0xf4/0xaec) [<c040d470>] (data_from_chip+0xf4/0xaec) from [<c04136c0>] (send_skb_to_core+0x40/0x178) [<c04136c0>] (send_skb_to_core+0x40/0x178) from [<c04139f4>] (cg2900_hu_receive+0x15c/0x2d0) [<c04139f4>] (cg2900_hu_receive+0x15c/0x2d0) from [<c0414cb8>] (hci_uart_tty_receive+0x74/0xa0) [<c0414cb8>] (hci_uart_tty_receive+0x74/0xa0) from [<c02cbd9c>] (flush_to_ldisc+0x188/0x198) [<c02cbd9c>] (flush_to_ldisc+0x188/0x198) from [<c00b2774>] (process_one_work+0x144/0x4b8) [<c00b2774>] (process_one_work+0x144/0x4b8) from [<c00b2e8c>] (worker_thread+0x198/0x468) [<c00b2e8c>] (worker_thread+0x198/0x468) from [<c00b9bc8>] (kthread+0x98/0xa0) [<c00b9bc8>] (kthread+0x98/0xa0) from [<c0061744>] (kernel_thread_exit+0x0/0x8) Signed-off-by: Szymon Janc <szymon.janc@tieto.com> Signed-off-by: Gustavo F. Padovan <padovan@profusion.mobi>
2011-09-26 16:19:47 +04:00
set_bit(RFCOMM_ENC_DROP, &d->flags);
continue;
}
}
if (!test_and_clear_bit(RFCOMM_AUTH_PENDING, &d->flags))
continue;
if (!status && hci_conn_check_secure(conn, d->sec_level))
set_bit(RFCOMM_AUTH_ACCEPT, &d->flags);
else
set_bit(RFCOMM_AUTH_REJECT, &d->flags);
}
rfcomm_schedule();
}
static struct hci_cb rfcomm_cb = {
.name = "RFCOMM",
Bluetooth: Add enhanced security model for Simple Pairing The current security model is based around the flags AUTH, ENCRYPT and SECURE. Starting with support for the Bluetooth 2.1 specification this is no longer sufficient. The different security levels are now defined as SDP, LOW, MEDIUM and SECURE. Previously it was possible to set each security independently, but this actually doesn't make a lot of sense. For Bluetooth the encryption depends on a previous successful authentication. Also you can only update your existing link key if you successfully created at least one before. And of course the update of link keys without having proper encryption in place is a security issue. The new security levels from the Bluetooth 2.1 specification are now used internally. All old settings are mapped to the new values and this way it ensures that old applications still work. The only limitation is that it is no longer possible to set authentication without also enabling encryption. No application should have done this anyway since this is actually a security issue. Without encryption the integrity of the authentication can't be guaranteed. As default for a new L2CAP or RFCOMM connection, the LOW security level is used. The only exception here are the service discovery sessions on PSM 1 where SDP level is used. To have similar security strength as with a Bluetooth 2.0 and before combination key, the MEDIUM level should be used. This is according to the Bluetooth specification. The MEDIUM level will not require any kind of man-in-the-middle (MITM) protection. Only the HIGH security level will require this. Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
2009-01-15 23:58:04 +03:00
.security_cfm = rfcomm_security_cfm
};
static int rfcomm_dlc_debugfs_show(struct seq_file *f, void *x)
{
struct rfcomm_session *s;
rfcomm_lock();
list_for_each_entry(s, &session_list, list) {
struct rfcomm_dlc *d;
list_for_each_entry(d, &s->dlcs, list) {
struct sock *sk = s->sock->sk;
seq_printf(f, "%pMR %pMR %ld %d %d %d %d\n",
&bt_sk(sk)->src, &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;
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");