mirror of https://gitee.com/openkylin/linux.git
2260 lines
50 KiB
C
2260 lines
50 KiB
C
/*
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RFCOMM implementation for Linux Bluetooth stack (BlueZ).
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Copyright (C) 2002 Maxim Krasnyansky <maxk@qualcomm.com>
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Copyright (C) 2002 Marcel Holtmann <marcel@holtmann.org>
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License version 2 as
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published by the Free Software Foundation;
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
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OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT OF THIRD PARTY RIGHTS.
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IN NO EVENT SHALL THE COPYRIGHT HOLDER(S) AND AUTHOR(S) BE LIABLE FOR ANY
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CLAIM, OR ANY SPECIAL INDIRECT OR CONSEQUENTIAL DAMAGES, OR ANY DAMAGES
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WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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ALL LIABILITY, INCLUDING LIABILITY FOR INFRINGEMENT OF ANY PATENTS,
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COPYRIGHTS, TRADEMARKS OR OTHER RIGHTS, RELATING TO USE OF THIS
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SOFTWARE IS DISCLAIMED.
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*/
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/*
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* Bluetooth RFCOMM core.
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*/
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#include <linux/module.h>
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#include <linux/debugfs.h>
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#include <linux/kthread.h>
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#include <asm/unaligned.h>
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#include <net/bluetooth/bluetooth.h>
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#include <net/bluetooth/hci_core.h>
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#include <net/bluetooth/l2cap.h>
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#include <net/bluetooth/rfcomm.h>
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#define VERSION "1.11"
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static bool disable_cfc;
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static bool l2cap_ertm;
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static int channel_mtu = -1;
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static unsigned int l2cap_mtu = RFCOMM_MAX_L2CAP_MTU;
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static struct task_struct *rfcomm_thread;
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static DEFINE_MUTEX(rfcomm_mutex);
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#define rfcomm_lock() mutex_lock(&rfcomm_mutex)
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#define rfcomm_unlock() mutex_unlock(&rfcomm_mutex)
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static LIST_HEAD(session_list);
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static int rfcomm_send_frame(struct rfcomm_session *s, u8 *data, int len);
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static int rfcomm_send_sabm(struct rfcomm_session *s, u8 dlci);
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static int rfcomm_send_disc(struct rfcomm_session *s, u8 dlci);
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static int rfcomm_queue_disc(struct rfcomm_dlc *d);
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static int rfcomm_send_nsc(struct rfcomm_session *s, int cr, u8 type);
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static int rfcomm_send_pn(struct rfcomm_session *s, int cr, struct rfcomm_dlc *d);
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static int rfcomm_send_msc(struct rfcomm_session *s, int cr, u8 dlci, u8 v24_sig);
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static int rfcomm_send_test(struct rfcomm_session *s, int cr, u8 *pattern, int len);
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static int rfcomm_send_credits(struct rfcomm_session *s, u8 addr, u8 credits);
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static void rfcomm_make_uih(struct sk_buff *skb, u8 addr);
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static void rfcomm_process_connect(struct rfcomm_session *s);
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static struct rfcomm_session *rfcomm_session_create(bdaddr_t *src,
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bdaddr_t *dst,
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u8 sec_level,
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int *err);
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static struct rfcomm_session *rfcomm_session_get(bdaddr_t *src, bdaddr_t *dst);
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static struct rfcomm_session *rfcomm_session_del(struct rfcomm_session *s);
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/* ---- RFCOMM frame parsing macros ---- */
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#define __get_dlci(b) ((b & 0xfc) >> 2)
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#define __get_channel(b) ((b & 0xf8) >> 3)
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#define __get_dir(b) ((b & 0x04) >> 2)
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#define __get_type(b) ((b & 0xef))
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#define __test_ea(b) ((b & 0x01))
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#define __test_cr(b) (!!(b & 0x02))
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#define __test_pf(b) (!!(b & 0x10))
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#define __session_dir(s) ((s)->initiator ? 0x00 : 0x01)
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#define __addr(cr, dlci) (((dlci & 0x3f) << 2) | (cr << 1) | 0x01)
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#define __ctrl(type, pf) (((type & 0xef) | (pf << 4)))
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#define __dlci(dir, chn) (((chn & 0x1f) << 1) | dir)
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#define __srv_channel(dlci) (dlci >> 1)
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#define __dir(dlci) (dlci & 0x01)
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#define __len8(len) (((len) << 1) | 1)
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#define __len16(len) ((len) << 1)
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/* MCC macros */
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#define __mcc_type(cr, type) (((type << 2) | (cr << 1) | 0x01))
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#define __get_mcc_type(b) ((b & 0xfc) >> 2)
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#define __get_mcc_len(b) ((b & 0xfe) >> 1)
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/* RPN macros */
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#define __rpn_line_settings(data, stop, parity) ((data & 0x3) | ((stop & 0x1) << 2) | ((parity & 0x7) << 3))
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#define __get_rpn_data_bits(line) ((line) & 0x3)
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#define __get_rpn_stop_bits(line) (((line) >> 2) & 0x1)
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#define __get_rpn_parity(line) (((line) >> 3) & 0x7)
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static DECLARE_WAIT_QUEUE_HEAD(rfcomm_wq);
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static void rfcomm_schedule(void)
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{
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wake_up_all(&rfcomm_wq);
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}
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/* ---- RFCOMM FCS computation ---- */
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/* reversed, 8-bit, poly=0x07 */
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static unsigned char rfcomm_crc_table[256] = {
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0x00, 0x91, 0xe3, 0x72, 0x07, 0x96, 0xe4, 0x75,
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0x0e, 0x9f, 0xed, 0x7c, 0x09, 0x98, 0xea, 0x7b,
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0x1c, 0x8d, 0xff, 0x6e, 0x1b, 0x8a, 0xf8, 0x69,
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0x12, 0x83, 0xf1, 0x60, 0x15, 0x84, 0xf6, 0x67,
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0x38, 0xa9, 0xdb, 0x4a, 0x3f, 0xae, 0xdc, 0x4d,
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0x36, 0xa7, 0xd5, 0x44, 0x31, 0xa0, 0xd2, 0x43,
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0x24, 0xb5, 0xc7, 0x56, 0x23, 0xb2, 0xc0, 0x51,
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0x2a, 0xbb, 0xc9, 0x58, 0x2d, 0xbc, 0xce, 0x5f,
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0x70, 0xe1, 0x93, 0x02, 0x77, 0xe6, 0x94, 0x05,
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0x7e, 0xef, 0x9d, 0x0c, 0x79, 0xe8, 0x9a, 0x0b,
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0x6c, 0xfd, 0x8f, 0x1e, 0x6b, 0xfa, 0x88, 0x19,
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0x62, 0xf3, 0x81, 0x10, 0x65, 0xf4, 0x86, 0x17,
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0x48, 0xd9, 0xab, 0x3a, 0x4f, 0xde, 0xac, 0x3d,
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0x46, 0xd7, 0xa5, 0x34, 0x41, 0xd0, 0xa2, 0x33,
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0x54, 0xc5, 0xb7, 0x26, 0x53, 0xc2, 0xb0, 0x21,
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0x5a, 0xcb, 0xb9, 0x28, 0x5d, 0xcc, 0xbe, 0x2f,
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0xe0, 0x71, 0x03, 0x92, 0xe7, 0x76, 0x04, 0x95,
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0xee, 0x7f, 0x0d, 0x9c, 0xe9, 0x78, 0x0a, 0x9b,
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0xfc, 0x6d, 0x1f, 0x8e, 0xfb, 0x6a, 0x18, 0x89,
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0xf2, 0x63, 0x11, 0x80, 0xf5, 0x64, 0x16, 0x87,
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0xd8, 0x49, 0x3b, 0xaa, 0xdf, 0x4e, 0x3c, 0xad,
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0xd6, 0x47, 0x35, 0xa4, 0xd1, 0x40, 0x32, 0xa3,
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0xc4, 0x55, 0x27, 0xb6, 0xc3, 0x52, 0x20, 0xb1,
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0xca, 0x5b, 0x29, 0xb8, 0xcd, 0x5c, 0x2e, 0xbf,
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0x90, 0x01, 0x73, 0xe2, 0x97, 0x06, 0x74, 0xe5,
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0x9e, 0x0f, 0x7d, 0xec, 0x99, 0x08, 0x7a, 0xeb,
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0x8c, 0x1d, 0x6f, 0xfe, 0x8b, 0x1a, 0x68, 0xf9,
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0x82, 0x13, 0x61, 0xf0, 0x85, 0x14, 0x66, 0xf7,
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0xa8, 0x39, 0x4b, 0xda, 0xaf, 0x3e, 0x4c, 0xdd,
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0xa6, 0x37, 0x45, 0xd4, 0xa1, 0x30, 0x42, 0xd3,
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0xb4, 0x25, 0x57, 0xc6, 0xb3, 0x22, 0x50, 0xc1,
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0xba, 0x2b, 0x59, 0xc8, 0xbd, 0x2c, 0x5e, 0xcf
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};
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/* CRC on 2 bytes */
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#define __crc(data) (rfcomm_crc_table[rfcomm_crc_table[0xff ^ data[0]] ^ data[1]])
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/* FCS on 2 bytes */
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static inline u8 __fcs(u8 *data)
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{
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return 0xff - __crc(data);
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}
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/* FCS on 3 bytes */
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static inline u8 __fcs2(u8 *data)
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{
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return 0xff - rfcomm_crc_table[__crc(data) ^ data[2]];
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}
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/* Check FCS */
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static inline int __check_fcs(u8 *data, int type, u8 fcs)
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{
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u8 f = __crc(data);
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if (type != RFCOMM_UIH)
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f = rfcomm_crc_table[f ^ data[2]];
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return rfcomm_crc_table[f ^ fcs] != 0xcf;
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}
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/* ---- L2CAP callbacks ---- */
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static void rfcomm_l2state_change(struct sock *sk)
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{
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BT_DBG("%p state %d", sk, sk->sk_state);
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rfcomm_schedule();
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}
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static void rfcomm_l2data_ready(struct sock *sk)
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{
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BT_DBG("%p", sk);
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rfcomm_schedule();
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}
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static int rfcomm_l2sock_create(struct socket **sock)
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{
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int err;
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BT_DBG("");
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err = sock_create_kern(&init_net, PF_BLUETOOTH, SOCK_SEQPACKET, BTPROTO_L2CAP, sock);
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if (!err) {
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struct sock *sk = (*sock)->sk;
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sk->sk_data_ready = rfcomm_l2data_ready;
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sk->sk_state_change = rfcomm_l2state_change;
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}
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return err;
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}
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static int rfcomm_check_security(struct rfcomm_dlc *d)
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{
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struct sock *sk = d->session->sock->sk;
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struct l2cap_conn *conn = l2cap_pi(sk)->chan->conn;
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__u8 auth_type;
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switch (d->sec_level) {
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case BT_SECURITY_HIGH:
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case BT_SECURITY_FIPS:
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auth_type = HCI_AT_GENERAL_BONDING_MITM;
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break;
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case BT_SECURITY_MEDIUM:
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auth_type = HCI_AT_GENERAL_BONDING;
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break;
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default:
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auth_type = HCI_AT_NO_BONDING;
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break;
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}
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return hci_conn_security(conn->hcon, d->sec_level, auth_type,
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d->out);
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}
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static void rfcomm_session_timeout(unsigned long arg)
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{
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struct rfcomm_session *s = (void *) arg;
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BT_DBG("session %p state %ld", s, s->state);
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set_bit(RFCOMM_TIMED_OUT, &s->flags);
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rfcomm_schedule();
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}
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static void rfcomm_session_set_timer(struct rfcomm_session *s, long timeout)
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{
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BT_DBG("session %p state %ld timeout %ld", s, s->state, timeout);
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mod_timer(&s->timer, jiffies + timeout);
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}
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static void rfcomm_session_clear_timer(struct rfcomm_session *s)
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{
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BT_DBG("session %p state %ld", s, s->state);
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del_timer_sync(&s->timer);
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}
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/* ---- RFCOMM DLCs ---- */
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static void rfcomm_dlc_timeout(unsigned long arg)
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{
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struct rfcomm_dlc *d = (void *) arg;
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BT_DBG("dlc %p state %ld", d, d->state);
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set_bit(RFCOMM_TIMED_OUT, &d->flags);
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rfcomm_dlc_put(d);
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rfcomm_schedule();
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}
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static void rfcomm_dlc_set_timer(struct rfcomm_dlc *d, long timeout)
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{
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BT_DBG("dlc %p state %ld timeout %ld", d, d->state, timeout);
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if (!mod_timer(&d->timer, jiffies + timeout))
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rfcomm_dlc_hold(d);
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}
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static void rfcomm_dlc_clear_timer(struct rfcomm_dlc *d)
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{
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BT_DBG("dlc %p state %ld", d, d->state);
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if (del_timer(&d->timer))
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rfcomm_dlc_put(d);
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}
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static void rfcomm_dlc_clear_state(struct rfcomm_dlc *d)
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{
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BT_DBG("%p", d);
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d->state = BT_OPEN;
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d->flags = 0;
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d->mscex = 0;
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d->sec_level = BT_SECURITY_LOW;
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d->mtu = RFCOMM_DEFAULT_MTU;
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d->v24_sig = RFCOMM_V24_RTC | RFCOMM_V24_RTR | RFCOMM_V24_DV;
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d->cfc = RFCOMM_CFC_DISABLED;
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d->rx_credits = RFCOMM_DEFAULT_CREDITS;
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}
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struct rfcomm_dlc *rfcomm_dlc_alloc(gfp_t prio)
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{
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struct rfcomm_dlc *d = kzalloc(sizeof(*d), prio);
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if (!d)
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return NULL;
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setup_timer(&d->timer, rfcomm_dlc_timeout, (unsigned long)d);
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skb_queue_head_init(&d->tx_queue);
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mutex_init(&d->lock);
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refcount_set(&d->refcnt, 1);
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rfcomm_dlc_clear_state(d);
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BT_DBG("%p", d);
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return d;
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}
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void rfcomm_dlc_free(struct rfcomm_dlc *d)
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{
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BT_DBG("%p", d);
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skb_queue_purge(&d->tx_queue);
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kfree(d);
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}
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static void rfcomm_dlc_link(struct rfcomm_session *s, struct rfcomm_dlc *d)
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{
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BT_DBG("dlc %p session %p", d, s);
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rfcomm_session_clear_timer(s);
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rfcomm_dlc_hold(d);
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list_add(&d->list, &s->dlcs);
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d->session = s;
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}
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static void rfcomm_dlc_unlink(struct rfcomm_dlc *d)
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{
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struct rfcomm_session *s = d->session;
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BT_DBG("dlc %p refcnt %d session %p", d, refcount_read(&d->refcnt), s);
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list_del(&d->list);
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d->session = NULL;
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rfcomm_dlc_put(d);
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if (list_empty(&s->dlcs))
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rfcomm_session_set_timer(s, RFCOMM_IDLE_TIMEOUT);
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}
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static struct rfcomm_dlc *rfcomm_dlc_get(struct rfcomm_session *s, u8 dlci)
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{
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struct rfcomm_dlc *d;
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list_for_each_entry(d, &s->dlcs, list)
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if (d->dlci == dlci)
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return d;
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return NULL;
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}
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static int rfcomm_check_channel(u8 channel)
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{
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return channel < 1 || channel > 30;
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}
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static int __rfcomm_dlc_open(struct rfcomm_dlc *d, bdaddr_t *src, bdaddr_t *dst, u8 channel)
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{
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struct rfcomm_session *s;
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int err = 0;
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u8 dlci;
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BT_DBG("dlc %p state %ld %pMR -> %pMR channel %d",
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d, d->state, src, dst, channel);
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if (rfcomm_check_channel(channel))
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return -EINVAL;
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if (d->state != BT_OPEN && d->state != BT_CLOSED)
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return 0;
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s = rfcomm_session_get(src, dst);
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if (!s) {
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s = rfcomm_session_create(src, dst, d->sec_level, &err);
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if (!s)
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return err;
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}
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dlci = __dlci(__session_dir(s), channel);
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/* Check if DLCI already exists */
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if (rfcomm_dlc_get(s, dlci))
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return -EBUSY;
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rfcomm_dlc_clear_state(d);
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d->dlci = dlci;
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d->addr = __addr(s->initiator, dlci);
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d->priority = 7;
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d->state = BT_CONFIG;
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rfcomm_dlc_link(s, d);
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d->out = 1;
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d->mtu = s->mtu;
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d->cfc = (s->cfc == RFCOMM_CFC_UNKNOWN) ? 0 : s->cfc;
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if (s->state == BT_CONNECTED) {
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if (rfcomm_check_security(d))
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rfcomm_send_pn(s, 1, d);
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else
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set_bit(RFCOMM_AUTH_PENDING, &d->flags);
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}
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rfcomm_dlc_set_timer(d, RFCOMM_CONN_TIMEOUT);
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return 0;
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}
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int rfcomm_dlc_open(struct rfcomm_dlc *d, bdaddr_t *src, bdaddr_t *dst, u8 channel)
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{
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int r;
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rfcomm_lock();
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r = __rfcomm_dlc_open(d, src, dst, channel);
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rfcomm_unlock();
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return r;
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}
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static void __rfcomm_dlc_disconn(struct rfcomm_dlc *d)
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{
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struct rfcomm_session *s = d->session;
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d->state = BT_DISCONN;
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if (skb_queue_empty(&d->tx_queue)) {
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rfcomm_send_disc(s, d->dlci);
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rfcomm_dlc_set_timer(d, RFCOMM_DISC_TIMEOUT);
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|
} else {
|
|
rfcomm_queue_disc(d);
|
|
rfcomm_dlc_set_timer(d, RFCOMM_DISC_TIMEOUT * 2);
|
|
}
|
|
}
|
|
|
|
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:
|
|
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();
|
|
return 0;
|
|
}
|
|
}
|
|
|
|
switch (d->state) {
|
|
case BT_CONNECT:
|
|
case BT_CONNECTED:
|
|
__rfcomm_dlc_disconn(d);
|
|
break;
|
|
|
|
case BT_CONFIG:
|
|
if (s->state != BT_BOUND) {
|
|
__rfcomm_dlc_disconn(d);
|
|
break;
|
|
}
|
|
/* if closing a dlc in a session that hasn't been started,
|
|
* just close and unlink the dlc
|
|
*/
|
|
|
|
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 = 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;
|
|
}
|
|
|
|
struct rfcomm_dlc *rfcomm_dlc_exists(bdaddr_t *src, bdaddr_t *dst, u8 channel)
|
|
{
|
|
struct rfcomm_session *s;
|
|
struct rfcomm_dlc *dlc = NULL;
|
|
u8 dlci;
|
|
|
|
if (rfcomm_check_channel(channel))
|
|
return ERR_PTR(-EINVAL);
|
|
|
|
rfcomm_lock();
|
|
s = rfcomm_session_get(src, dst);
|
|
if (s) {
|
|
dlci = __dlci(__session_dir(s), channel);
|
|
dlc = rfcomm_dlc_get(s, dlci);
|
|
}
|
|
rfcomm_unlock();
|
|
return dlc;
|
|
}
|
|
|
|
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_send_noerror(struct rfcomm_dlc *d, struct sk_buff *skb)
|
|
{
|
|
int len = skb->len;
|
|
|
|
BT_DBG("dlc %p mtu %d len %d", d, d->mtu, len);
|
|
|
|
rfcomm_make_uih(skb, d->addr);
|
|
skb_queue_tail(&d->tx_queue, skb);
|
|
|
|
if (d->state == BT_CONNECTED &&
|
|
!test_bit(RFCOMM_TX_THROTTLED, &d->flags))
|
|
rfcomm_schedule();
|
|
}
|
|
|
|
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, *n;
|
|
struct l2cap_chan *chan;
|
|
list_for_each_entry_safe(s, n, &session_list, list) {
|
|
chan = l2cap_pi(s->sock->sk)->chan;
|
|
|
|
if ((!bacmp(src, BDADDR_ANY) || !bacmp(&chan->src, src)) &&
|
|
!bacmp(&chan->dst, dst))
|
|
return s;
|
|
}
|
|
return NULL;
|
|
}
|
|
|
|
static struct rfcomm_session *rfcomm_session_close(struct rfcomm_session *s,
|
|
int err)
|
|
{
|
|
struct rfcomm_dlc *d, *n;
|
|
|
|
s->state = BT_CLOSED;
|
|
|
|
BT_DBG("session %p state %ld err %d", s, s->state, err);
|
|
|
|
/* Close all dlcs */
|
|
list_for_each_entry_safe(d, n, &s->dlcs, list) {
|
|
d->state = BT_CLOSED;
|
|
__rfcomm_dlc_close(d, err);
|
|
}
|
|
|
|
rfcomm_session_clear_timer(s);
|
|
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;
|
|
addr.l2_bdaddr_type = BDADDR_BREDR;
|
|
*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 = cpu_to_le16(L2CAP_PSM_RFCOMM);
|
|
addr.l2_cid = 0;
|
|
addr.l2_bdaddr_type = BDADDR_BREDR;
|
|
*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 l2cap_chan *chan = l2cap_pi(s->sock->sk)->chan;
|
|
if (src)
|
|
bacpy(src, &chan->src);
|
|
if (dst)
|
|
bacpy(dst, &chan->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 = __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(0, 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 = skb_push(skb, 4);
|
|
put_unaligned(cpu_to_le16(__len16(len)), (__le16 *) &hdr->len);
|
|
} else {
|
|
hdr = 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);
|
|
} 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, *n;
|
|
|
|
BT_DBG("session %p state %ld", s, s->state);
|
|
|
|
list_for_each_entry_safe(d, n, &s->dlcs, 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 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, *n;
|
|
|
|
BT_DBG("session %p state %ld", s, s->state);
|
|
|
|
list_for_each_entry_safe(d, n, &s->dlcs, list) {
|
|
if (test_bit(RFCOMM_TIMED_OUT, &d->flags)) {
|
|
__rfcomm_dlc_close(d, ETIMEDOUT);
|
|
continue;
|
|
}
|
|
|
|
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);
|
|
if (!s)
|
|
break;
|
|
} else {
|
|
kfree_skb(skb);
|
|
}
|
|
}
|
|
|
|
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 rfcomm_session *s, *n;
|
|
|
|
rfcomm_lock();
|
|
|
|
list_for_each_entry_safe(s, n, &session_list, list) {
|
|
if (test_and_clear_bit(RFCOMM_TIMED_OUT, &s->flags)) {
|
|
s->state = BT_DISCONN;
|
|
rfcomm_send_disc(s, 0);
|
|
continue;
|
|
}
|
|
|
|
switch (s->state) {
|
|
case BT_LISTEN:
|
|
rfcomm_accept_connection(s);
|
|
continue;
|
|
|
|
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 = cpu_to_le16(L2CAP_PSM_RFCOMM);
|
|
addr.l2_cid = 0;
|
|
addr.l2_bdaddr_type = BDADDR_BREDR;
|
|
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, *n;
|
|
|
|
BT_DBG("");
|
|
|
|
list_for_each_entry_safe(s, n, &session_list, list)
|
|
rfcomm_session_del(s);
|
|
}
|
|
|
|
static int rfcomm_run(void *unused)
|
|
{
|
|
DEFINE_WAIT_FUNC(wait, woken_wake_function);
|
|
BT_DBG("");
|
|
|
|
set_user_nice(current, -10);
|
|
|
|
rfcomm_add_listener(BDADDR_ANY);
|
|
|
|
add_wait_queue(&rfcomm_wq, &wait);
|
|
while (!kthread_should_stop()) {
|
|
|
|
/* Process stuff */
|
|
rfcomm_process_sessions();
|
|
|
|
wait_woken(&wait, TASK_INTERRUPTIBLE, MAX_SCHEDULE_TIMEOUT);
|
|
}
|
|
remove_wait_queue(&rfcomm_wq, &wait);
|
|
|
|
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, *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_entry_safe(d, n, &s->dlcs, list) {
|
|
if (test_and_clear_bit(RFCOMM_SEC_PENDING, &d->flags)) {
|
|
rfcomm_dlc_clear_timer(d);
|
|
if (status || encrypt == 0x00) {
|
|
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 ||
|
|
d->sec_level == BT_SECURITY_FIPS) {
|
|
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",
|
|
.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 l2cap_chan *chan = l2cap_pi(s->sock->sk)->chan;
|
|
struct rfcomm_dlc *d;
|
|
list_for_each_entry(d, &s->dlcs, list) {
|
|
seq_printf(f, "%pMR %pMR %ld %d %d %d %d\n",
|
|
&chan->src, &chan->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;
|
|
}
|
|
|
|
err = rfcomm_init_ttys();
|
|
if (err < 0)
|
|
goto stop;
|
|
|
|
err = rfcomm_init_sockets();
|
|
if (err < 0)
|
|
goto cleanup;
|
|
|
|
BT_INFO("RFCOMM ver %s", VERSION);
|
|
|
|
if (IS_ERR_OR_NULL(bt_debugfs))
|
|
return 0;
|
|
|
|
rfcomm_dlc_debugfs = debugfs_create_file("rfcomm_dlc", 0444,
|
|
bt_debugfs, NULL,
|
|
&rfcomm_dlc_debugfs_fops);
|
|
|
|
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");
|