| /* |
| 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 __session_dir(s) ((s)->initiator ? 0x00 : 0x01) |
| |
| #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 DECLARE_WAIT_QUEUE_HEAD(rfcomm_wq); |
| |
| static void rfcomm_schedule(void) |
| { |
| wake_up_all(&rfcomm_wq); |
| } |
| |
| /* ---- 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) |
| { |
| BT_DBG("%p", sk); |
| 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: |
| case BT_SECURITY_FIPS: |
| 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, |
| d->out); |
| } |
| |
| 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); |
| |
| 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); |
| |
| 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); |
| mutex_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_check_channel(u8 channel) |
| { |
| return channel < 1 || channel > 30; |
| } |
| |
| 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 (rfcomm_check_channel(channel)) |
| 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(__session_dir(s), channel); |
| |
| /* Check if DLCI already exists */ |
| if (rfcomm_dlc_get(s, dlci)) |
| return -EBUSY; |
| |
| rfcomm_dlc_clear_state(d); |
| |
| d->dlci = dlci; |
| d->addr = __addr(s->initiator, dlci); |
| d->priority = 7; |
| |
| d->state = BT_CONFIG; |
| rfcomm_dlc_link(s, d); |
| |
| d->out = 1; |
| |
| d->mtu = s->mtu; |
| d->cfc = (s->cfc == RFCOMM_CFC_UNKNOWN) ? 0 : s->cfc; |
| |
| if (s->state == BT_CONNECTED) { |
| if (rfcomm_check_security(d)) |
| rfcomm_send_pn(s, 1, d); |
| else |
| set_bit(RFCOMM_AUTH_PENDING, &d->flags); |
| } |
| |
| rfcomm_dlc_set_timer(d, RFCOMM_CONN_TIMEOUT); |
| |
| return 0; |
| } |
| |
| int rfcomm_dlc_open(struct rfcomm_dlc *d, bdaddr_t *src, bdaddr_t *dst, u8 channel) |
| { |
| int r; |
| |
| rfcomm_lock(); |
| |
| r = __rfcomm_dlc_open(d, src, dst, channel); |
| |
| rfcomm_unlock(); |
| return r; |
| } |
| |
| static void __rfcomm_dlc_disconn(struct rfcomm_dlc *d) |
| { |
| struct rfcomm_session *s = d->session; |
| |
| 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); |
| } |
| } |
| |
| 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; |
| struct list_head *p, *n; |
| struct l2cap_chan *chan; |
| list_for_each_safe(p, n, &session_list) { |
| s = list_entry(p, struct rfcomm_session, 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; |
| 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); |
| 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 = (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(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 = (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); |
| } 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)) { |
| 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; |
| struct list_head *p, *n; |
| |
| BT_DBG("session %p state %ld", s, s->state); |
| |
| list_for_each_safe(p, n, &s->dlcs) { |
| d = list_entry(p, struct rfcomm_dlc, list); |
| |
| if (test_bit(RFCOMM_TIMED_OUT, &d->flags)) { |
| __rfcomm_dlc_close(d, ETIMEDOUT); |
| continue; |
| } |
| |
| if (test_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 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; |
| } |
| |
| 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; |
| 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) |
| { |
| 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; |
| 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) { |
| 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"); |