patch-2.4.21 linux-2.4.21/net/bluetooth/rfcomm/core.c
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- Lines: 1861
- Date:
2003-06-13 07:51:39.000000000 -0700
- Orig file:
linux-2.4.20/net/bluetooth/rfcomm/core.c
- Orig date:
1969-12-31 16:00:00.000000000 -0800
diff -urN linux-2.4.20/net/bluetooth/rfcomm/core.c linux-2.4.21/net/bluetooth/rfcomm/core.c
@@ -0,0 +1,1860 @@
+/*
+ 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.
+*/
+
+/*
+ RPN support - Dirk Husemann <hud@zurich.ibm.com>
+*/
+
+/*
+ * RFCOMM core.
+ *
+ * $Id: core.c,v 1.46 2002/10/18 20:12:12 maxk Exp $
+ */
+
+#define __KERNEL_SYSCALLS__
+
+#include <linux/config.h>
+#include <linux/module.h>
+#include <linux/errno.h>
+#include <linux/kernel.h>
+#include <linux/sched.h>
+#include <linux/signal.h>
+#include <linux/init.h>
+#include <linux/wait.h>
+#include <linux/net.h>
+#include <linux/proc_fs.h>
+#include <net/sock.h>
+#include <asm/uaccess.h>
+#include <asm/unaligned.h>
+
+#include <net/bluetooth/bluetooth.h>
+#include <net/bluetooth/l2cap.h>
+#include <net/bluetooth/rfcomm.h>
+
+#define VERSION "1.0"
+
+#ifndef CONFIG_BLUEZ_RFCOMM_DEBUG
+#undef BT_DBG
+#define BT_DBG(D...)
+#endif
+
+struct task_struct *rfcomm_thread;
+DECLARE_MUTEX(rfcomm_sem);
+unsigned long rfcomm_event;
+
+static LIST_HEAD(session_list);
+static atomic_t terminate, running;
+
+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);
+
+/* ---- RFCOMM frame parsing macros ---- */
+#define __get_dlci(b) ((b & 0xfc) >> 2)
+#define __get_channel(b) ((b & 0xf8) >> 3)
+#define __get_dir(b) ((b & 0x04) >> 2)
+#define __get_type(b) ((b & 0xef))
+
+#define __test_ea(b) ((b & 0x01))
+#define __test_cr(b) ((b & 0x02))
+#define __test_pf(b) ((b & 0x10))
+
+#define __addr(cr, dlci) (((dlci & 0x3f) << 2) | (cr << 1) | 0x01)
+#define __ctrl(type, pf) (((type & 0xef) | (pf << 4)))
+#define __dlci(dir, chn) (((chn & 0x1f) << 1) | dir)
+#define __srv_channel(dlci) (dlci >> 1)
+#define __dir(dlci) (dlci & 0x01)
+
+#define __len8(len) (((len) << 1) | 1)
+#define __len16(len) ((len) << 1)
+
+/* MCC macros */
+#define __mcc_type(cr, type) (((type << 2) | (cr << 1) | 0x01))
+#define __get_mcc_type(b) ((b & 0xfc) >> 2)
+#define __get_mcc_len(b) ((b & 0xfe) >> 1)
+
+/* RPN macros */
+#define __rpn_line_settings(data, stop, parity) ((data & 0x3) | ((stop & 0x1) << 2) | ((parity & 0x3) << 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) & 0x3)
+
+/* ---- RFCOMM FCS computation ---- */
+
+/* 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->state);
+ rfcomm_schedule(RFCOMM_SCHED_STATE);
+}
+
+static void rfcomm_l2data_ready(struct sock *sk, int bytes)
+{
+ BT_DBG("%p bytes %d", sk, bytes);
+ rfcomm_schedule(RFCOMM_SCHED_RX);
+}
+
+static int rfcomm_l2sock_create(struct socket **sock)
+{
+ int err;
+
+ BT_DBG("");
+
+ err = sock_create(PF_BLUETOOTH, SOCK_SEQPACKET, BTPROTO_L2CAP, sock);
+ if (!err) {
+ struct sock *sk = (*sock)->sk;
+ sk->data_ready = rfcomm_l2data_ready;
+ sk->state_change = rfcomm_l2state_change;
+ }
+ return err;
+}
+
+/* ---- RFCOMM DLCs ---- */
+static void rfcomm_dlc_timeout(unsigned long arg)
+{
+ struct rfcomm_dlc *d = (void *) arg;
+
+ BT_DBG("dlc %p state %ld", d, d->state);
+
+ set_bit(RFCOMM_TIMED_OUT, &d->flags);
+ rfcomm_dlc_put(d);
+ rfcomm_schedule(RFCOMM_SCHED_TIMEO);
+}
+
+static void rfcomm_dlc_set_timer(struct rfcomm_dlc *d, long timeout)
+{
+ BT_DBG("dlc %p state %ld timeout %ld", d, d->state, timeout);
+
+ if (!mod_timer(&d->timer, jiffies + timeout))
+ rfcomm_dlc_hold(d);
+}
+
+static void rfcomm_dlc_clear_timer(struct rfcomm_dlc *d)
+{
+ BT_DBG("dlc %p state %ld", d, d->state);
+
+ if (timer_pending(&d->timer) && del_timer(&d->timer))
+ rfcomm_dlc_put(d);
+}
+
+static void rfcomm_dlc_clear_state(struct rfcomm_dlc *d)
+{
+ BT_DBG("%p", d);
+
+ d->state = BT_OPEN;
+ d->flags = 0;
+ d->mtu = RFCOMM_DEFAULT_MTU;
+ d->v24_sig = RFCOMM_V24_RTC | RFCOMM_V24_RTR | RFCOMM_V24_DV;
+
+ d->credits = RFCOMM_MAX_CREDITS;
+ d->rx_credits = RFCOMM_DEFAULT_CREDITS;
+}
+
+struct rfcomm_dlc *rfcomm_dlc_alloc(int prio)
+{
+ struct rfcomm_dlc *d = kmalloc(sizeof(*d), prio);
+ if (!d)
+ return NULL;
+ memset(d, 0, sizeof(*d));
+
+ init_timer(&d->timer);
+ d->timer.function = rfcomm_dlc_timeout;
+ d->timer.data = (unsigned long) d;
+
+ skb_queue_head_init(&d->tx_queue);
+ spin_lock_init(&d->lock);
+ atomic_set(&d->refcnt, 1);
+
+ rfcomm_dlc_clear_state(d);
+
+ BT_DBG("%p", d);
+ return d;
+}
+
+void rfcomm_dlc_free(struct rfcomm_dlc *d)
+{
+ BT_DBG("%p", d);
+
+ skb_queue_purge(&d->tx_queue);
+ kfree(d);
+}
+
+static void rfcomm_dlc_link(struct rfcomm_session *s, struct rfcomm_dlc *d)
+{
+ BT_DBG("dlc %p session %p", d, s);
+
+ rfcomm_session_hold(s);
+
+ rfcomm_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);
+
+ rfcomm_session_put(s);
+}
+
+static struct rfcomm_dlc *rfcomm_dlc_get(struct rfcomm_session *s, u8 dlci)
+{
+ struct rfcomm_dlc *d;
+ struct list_head *p;
+
+ list_for_each(p, &s->dlcs) {
+ d = list_entry(p, struct rfcomm_dlc, list);
+ if (d->dlci == dlci)
+ return d;
+ }
+ return NULL;
+}
+
+static int __rfcomm_dlc_open(struct rfcomm_dlc *d, bdaddr_t *src, bdaddr_t *dst, u8 channel)
+{
+ struct rfcomm_session *s;
+ u8 dlci = __dlci(0, channel);
+ int err = 0;
+
+ BT_DBG("dlc %p state %ld %s %s channel %d dlci %d",
+ d, d->state, batostr(src), batostr(dst), channel, dlci);
+
+ if (dlci < 1 || dlci > 62)
+ return -EINVAL;
+
+ if (d->state != BT_OPEN && d->state != BT_CLOSED)
+ return 0;
+
+ s = rfcomm_session_get(src, dst);
+ if (!s) {
+ s = rfcomm_session_create(src, dst, &err);
+ if (!s)
+ return err;
+ }
+
+ /* 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->state = BT_CONFIG;
+ rfcomm_dlc_link(s, d);
+
+ d->mtu = s->mtu;
+ d->credits = s->credits;
+
+ if (s->state == BT_CONNECTED)
+ rfcomm_send_pn(s, 1, d);
+ 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)
+{
+ mm_segment_t fs;
+ int r;
+
+ rfcomm_lock();
+
+ fs = get_fs(); set_fs(KERNEL_DS);
+ r = __rfcomm_dlc_open(d, src, dst, channel);
+ set_fs(fs);
+
+ rfcomm_unlock();
+ return r;
+}
+
+static int __rfcomm_dlc_close(struct rfcomm_dlc *d, int err)
+{
+ struct rfcomm_session *s = d->session;
+ if (!s)
+ return 0;
+
+ BT_DBG("dlc %p state %ld dlci %d err %d session %p",
+ d, d->state, d->dlci, err, s);
+
+ switch (d->state) {
+ case BT_CONNECTED:
+ case BT_CONFIG:
+ case BT_CONNECT:
+ d->state = BT_DISCONN;
+ if (skb_queue_empty(&d->tx_queue)) {
+ rfcomm_send_disc(s, d->dlci);
+ rfcomm_dlc_set_timer(d, RFCOMM_DISC_TIMEOUT);
+ } else {
+ rfcomm_queue_disc(d);
+ rfcomm_dlc_set_timer(d, RFCOMM_DISC_TIMEOUT * 2);
+ }
+ break;
+
+ 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)
+{
+ mm_segment_t fs;
+ int r;
+
+ rfcomm_lock();
+
+ fs = get_fs(); set_fs(KERNEL_DS);
+ r = __rfcomm_dlc_close(d, err);
+ set_fs(fs);
+
+ rfcomm_unlock();
+ return r;
+}
+
+int rfcomm_dlc_send(struct rfcomm_dlc *d, struct sk_buff *skb)
+{
+ int len = skb->len;
+
+ if (d->state != BT_CONNECTED)
+ return -ENOTCONN;
+
+ BT_DBG("dlc %p mtu %d len %d", d, d->mtu, len);
+
+ if (len > d->mtu)
+ return -EINVAL;
+
+ rfcomm_make_uih(skb, d->addr);
+ skb_queue_tail(&d->tx_queue, skb);
+
+ if (!test_bit(RFCOMM_TX_THROTTLED, &d->flags))
+ rfcomm_schedule(RFCOMM_SCHED_TX);
+ return len;
+}
+
+void __rfcomm_dlc_throttle(struct rfcomm_dlc *d)
+{
+ BT_DBG("dlc %p state %ld", d, d->state);
+
+ if (!d->credits) {
+ d->v24_sig |= RFCOMM_V24_FC;
+ set_bit(RFCOMM_MSC_PENDING, &d->flags);
+ }
+ rfcomm_schedule(RFCOMM_SCHED_TX);
+}
+
+void __rfcomm_dlc_unthrottle(struct rfcomm_dlc *d)
+{
+ BT_DBG("dlc %p state %ld", d, d->state);
+
+ if (!d->credits) {
+ d->v24_sig &= ~RFCOMM_V24_FC;
+ set_bit(RFCOMM_MSC_PENDING, &d->flags);
+ }
+ rfcomm_schedule(RFCOMM_SCHED_TX);
+}
+
+/*
+ Set/get modem status functions use _local_ status i.e. what we report
+ to the other side.
+ Remote status is provided by dlc->modem_status() callback.
+ */
+int rfcomm_dlc_set_modem_status(struct rfcomm_dlc *d, u8 v24_sig)
+{
+ BT_DBG("dlc %p state %ld v24_sig 0x%x",
+ d, d->state, v24_sig);
+
+ if (test_bit(RFCOMM_RX_THROTTLED, &d->flags))
+ v24_sig |= RFCOMM_V24_FC;
+ else
+ v24_sig &= ~RFCOMM_V24_FC;
+
+ d->v24_sig = v24_sig;
+
+ if (!test_and_set_bit(RFCOMM_MSC_PENDING, &d->flags))
+ rfcomm_schedule(RFCOMM_SCHED_TX);
+
+ return 0;
+}
+
+int rfcomm_dlc_get_modem_status(struct rfcomm_dlc *d, u8 *v24_sig)
+{
+ BT_DBG("dlc %p state %ld v24_sig 0x%x",
+ d, d->state, d->v24_sig);
+
+ *v24_sig = d->v24_sig;
+ return 0;
+}
+
+/* ---- RFCOMM sessions ---- */
+struct rfcomm_session *rfcomm_session_add(struct socket *sock, int state)
+{
+ struct rfcomm_session *s = kmalloc(sizeof(*s), GFP_KERNEL);
+ if (!s)
+ return NULL;
+ memset(s, 0, sizeof(*s));
+
+ BT_DBG("session %p sock %p", s, sock);
+
+ INIT_LIST_HEAD(&s->dlcs);
+ s->state = state;
+ s->sock = sock;
+
+ s->mtu = RFCOMM_DEFAULT_MTU;
+ s->credits = RFCOMM_MAX_CREDITS;
+
+ list_add(&s->list, &session_list);
+
+ /* Do not increment module usage count for listeting sessions.
+ * Otherwise we won't be able to unload the module. */
+ if (state != BT_LISTEN)
+ MOD_INC_USE_COUNT;
+ return s;
+}
+
+void rfcomm_session_del(struct rfcomm_session *s)
+{
+ int state = s->state;
+
+ BT_DBG("session %p state %ld", s, s->state);
+
+ list_del(&s->list);
+
+ if (state == BT_CONNECTED)
+ rfcomm_send_disc(s, 0);
+
+ sock_release(s->sock);
+ kfree(s);
+
+ if (state != BT_LISTEN)
+ MOD_DEC_USE_COUNT;
+}
+
+struct rfcomm_session *rfcomm_session_get(bdaddr_t *src, bdaddr_t *dst)
+{
+ struct rfcomm_session *s;
+ struct list_head *p, *n;
+ struct bluez_pinfo *pi;
+ list_for_each_safe(p, n, &session_list) {
+ s = list_entry(p, struct rfcomm_session, list);
+ pi = bluez_pi(s->sock->sk);
+
+ if ((!bacmp(src, BDADDR_ANY) || !bacmp(&pi->src, src)) &&
+ !bacmp(&pi->dst, dst))
+ return s;
+ }
+ return NULL;
+}
+
+void rfcomm_session_close(struct rfcomm_session *s, int err)
+{
+ struct rfcomm_dlc *d;
+ struct list_head *p, *n;
+
+ BT_DBG("session %p state %ld err %d", s, s->state, err);
+
+ rfcomm_session_hold(s);
+
+ s->state = BT_CLOSED;
+
+ /* Close all dlcs */
+ list_for_each_safe(p, n, &s->dlcs) {
+ d = list_entry(p, struct rfcomm_dlc, list);
+ d->state = BT_CLOSED;
+ __rfcomm_dlc_close(d, err);
+ }
+
+ rfcomm_session_put(s);
+}
+
+struct rfcomm_session *rfcomm_session_create(bdaddr_t *src, bdaddr_t *dst, int *err)
+{
+ struct rfcomm_session *s = NULL;
+ struct sockaddr_l2 addr;
+ struct l2cap_options opts;
+ struct socket *sock;
+ int size;
+
+ BT_DBG("%s %s", batostr(src), batostr(dst));
+
+ *err = rfcomm_l2sock_create(&sock);
+ if (*err < 0)
+ return NULL;
+
+ bacpy(&addr.l2_bdaddr, src);
+ addr.l2_family = AF_BLUETOOTH;
+ addr.l2_psm = 0;
+ *err = sock->ops->bind(sock, (struct sockaddr *) &addr, sizeof(addr));
+ if (*err < 0)
+ goto failed;
+
+ /* Set L2CAP options */
+ size = sizeof(opts);
+ sock->ops->getsockopt(sock, SOL_L2CAP, L2CAP_OPTIONS, (void *)&opts, &size);
+
+ opts.imtu = RFCOMM_MAX_L2CAP_MTU;
+ sock->ops->setsockopt(sock, SOL_L2CAP, L2CAP_OPTIONS, (void *)&opts, size);
+
+ 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 = htobs(RFCOMM_PSM);
+ *err = sock->ops->connect(sock, (struct sockaddr *) &addr, sizeof(addr), O_NONBLOCK);
+ if (*err == 0 || *err == -EAGAIN)
+ return s;
+
+ rfcomm_session_del(s);
+ return NULL;
+
+failed:
+ sock_release(sock);
+ return NULL;
+}
+
+void rfcomm_session_getaddr(struct rfcomm_session *s, bdaddr_t *src, bdaddr_t *dst)
+{
+ struct sock *sk = s->sock->sk;
+ if (src)
+ bacpy(src, &bluez_pi(sk)->src);
+ if (dst)
+ bacpy(dst, &bluez_pi(sk)->dst);
+}
+
+/* ---- RFCOMM frame sending ---- */
+static int rfcomm_send_frame(struct rfcomm_session *s, u8 *data, int len)
+{
+ struct socket *sock = s->sock;
+ struct iovec iv = { data, len };
+ struct msghdr msg;
+ int err;
+
+ BT_DBG("session %p len %d", s, len);
+
+ memset(&msg, 0, sizeof(msg));
+ msg.msg_iovlen = 1;
+ msg.msg_iov = &iv;
+
+ err = sock->ops->sendmsg(sock, &msg, len, 0);
+ return err;
+}
+
+static int rfcomm_send_sabm(struct rfcomm_session *s, u8 dlci)
+{
+ struct rfcomm_cmd cmd;
+
+ BT_DBG("%p dlci %d", s, dlci);
+
+ cmd.addr = __addr(s->initiator, dlci);
+ cmd.ctrl = __ctrl(RFCOMM_SABM, 1);
+ cmd.len = __len8(0);
+ cmd.fcs = __fcs2((u8 *) &cmd);
+
+ return rfcomm_send_frame(s, (void *) &cmd, sizeof(cmd));
+}
+
+static int rfcomm_send_ua(struct rfcomm_session *s, u8 dlci)
+{
+ struct rfcomm_cmd cmd;
+
+ BT_DBG("%p dlci %d", s, dlci);
+
+ cmd.addr = __addr(!s->initiator, dlci);
+ cmd.ctrl = __ctrl(RFCOMM_UA, 1);
+ cmd.len = __len8(0);
+ cmd.fcs = __fcs2((u8 *) &cmd);
+
+ return rfcomm_send_frame(s, (void *) &cmd, sizeof(cmd));
+}
+
+static int rfcomm_send_disc(struct rfcomm_session *s, u8 dlci)
+{
+ struct rfcomm_cmd cmd;
+
+ BT_DBG("%p dlci %d", s, dlci);
+
+ cmd.addr = __addr(s->initiator, dlci);
+ cmd.ctrl = __ctrl(RFCOMM_DISC, 1);
+ cmd.len = __len8(0);
+ cmd.fcs = __fcs2((u8 *) &cmd);
+
+ return rfcomm_send_frame(s, (void *) &cmd, sizeof(cmd));
+}
+
+static int rfcomm_queue_disc(struct rfcomm_dlc *d)
+{
+ struct rfcomm_cmd *cmd;
+ struct sk_buff *skb;
+
+ BT_DBG("dlc %p dlci %d", d, d->dlci);
+
+ skb = alloc_skb(sizeof(*cmd), GFP_KERNEL);
+ if (!skb)
+ return -ENOMEM;
+
+ cmd = (void *) __skb_put(skb, sizeof(*cmd));
+ cmd->addr = d->addr;
+ cmd->ctrl = __ctrl(RFCOMM_DISC, 1);
+ cmd->len = __len8(0);
+ cmd->fcs = __fcs2((u8 *) cmd);
+
+ skb_queue_tail(&d->tx_queue, skb);
+ rfcomm_schedule(RFCOMM_SCHED_TX);
+ return 0;
+}
+
+static int rfcomm_send_dm(struct rfcomm_session *s, u8 dlci)
+{
+ struct rfcomm_cmd cmd;
+
+ BT_DBG("%p dlci %d", s, dlci);
+
+ cmd.addr = __addr(!s->initiator, dlci);
+ cmd.ctrl = __ctrl(RFCOMM_DM, 1);
+ cmd.len = __len8(0);
+ cmd.fcs = __fcs2((u8 *) &cmd);
+
+ return rfcomm_send_frame(s, (void *) &cmd, sizeof(cmd));
+}
+
+static int rfcomm_send_nsc(struct rfcomm_session *s, int cr, u8 type)
+{
+ struct rfcomm_hdr *hdr;
+ struct rfcomm_mcc *mcc;
+ u8 buf[16], *ptr = buf;
+
+ BT_DBG("%p cr %d type %d", s, cr, type);
+
+ hdr = (void *) ptr; ptr += sizeof(*hdr);
+ hdr->addr = __addr(s->initiator, 0);
+ hdr->ctrl = __ctrl(RFCOMM_UIH, 0);
+ hdr->len = __len8(sizeof(*mcc) + 1);
+
+ mcc = (void *) ptr; ptr += sizeof(*mcc);
+ mcc->type = __mcc_type(s->initiator, 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(s->initiator, RFCOMM_PN);
+ mcc->len = __len8(sizeof(*pn));
+
+ pn = (void *) ptr; ptr += sizeof(*pn);
+ pn->dlci = d->dlci;
+ pn->priority = 0;
+ pn->ack_timer = 0;
+ pn->max_retrans = 0;
+
+ if (d->credits) {
+ pn->flow_ctrl = cr ? 0xf0 : 0xe0;
+ pn->credits = RFCOMM_DEFAULT_CREDITS;
+ } else {
+ pn->flow_ctrl = 0;
+ pn->credits = 0;
+ }
+
+ pn->mtu = htobs(d->mtu);
+
+ *ptr = __fcs(buf); ptr++;
+
+ return rfcomm_send_frame(s, buf, ptr - buf);
+}
+
+static 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 = 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;
+
+ *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 iovec 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));
+ msg.msg_iovlen = 3;
+ msg.msg_iov = iv;
+ return sock->ops->sendmsg(sock, &msg, 6 + len, 0);
+}
+
+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(htobs(__len16(len)), (u16 *) &hdr->len);
+ } else {
+ hdr = (void *) skb_push(skb, 3);
+ hdr->len = __len8(len);
+ }
+ hdr->addr = addr;
+ hdr->ctrl = __ctrl(RFCOMM_UIH, 0);
+
+ crc = skb_put(skb, 1);
+ *crc = __fcs((void *) hdr);
+}
+
+/* ---- RFCOMM frame reception ---- */
+static int rfcomm_recv_ua(struct rfcomm_session *s, u8 dlci)
+{
+ BT_DBG("session %p state %ld dlci %d", s, s->state, dlci);
+
+ if (dlci) {
+ /* Data channel */
+ struct rfcomm_dlc *d = rfcomm_dlc_get(s, dlci);
+ if (!d) {
+ rfcomm_send_dm(s, dlci);
+ return 0;
+ }
+
+ switch (d->state) {
+ case BT_CONNECT:
+ rfcomm_dlc_clear_timer(d);
+
+ rfcomm_dlc_lock(d);
+ d->state = BT_CONNECTED;
+ d->state_change(d, 0);
+ rfcomm_dlc_unlock(d);
+
+ rfcomm_send_msc(s, 1, dlci, d->v24_sig);
+ break;
+
+ case BT_DISCONN:
+ d->state = BT_CLOSED;
+ __rfcomm_dlc_close(d, 0);
+ break;
+ }
+ } else {
+ /* Control channel */
+ switch (s->state) {
+ case BT_CONNECT:
+ s->state = BT_CONNECTED;
+ rfcomm_process_connect(s);
+ break;
+ }
+ }
+ return 0;
+}
+
+static int rfcomm_recv_dm(struct rfcomm_session *s, u8 dlci)
+{
+ int err = 0;
+
+ BT_DBG("session %p state %ld dlci %d", s, s->state, dlci);
+
+ if (dlci) {
+ /* Data DLC */
+ struct rfcomm_dlc *d = rfcomm_dlc_get(s, dlci);
+ if (d) {
+ if (d->state == BT_CONNECT || d->state == BT_CONFIG)
+ err = ECONNREFUSED;
+ else
+ err = ECONNRESET;
+
+ d->state = BT_CLOSED;
+ __rfcomm_dlc_close(d, err);
+ }
+ } else {
+ if (s->state == BT_CONNECT)
+ err = ECONNREFUSED;
+ else
+ err = ECONNRESET;
+
+ s->state = BT_CLOSED;
+ rfcomm_session_close(s, err);
+ }
+ return 0;
+}
+
+static int rfcomm_recv_disc(struct rfcomm_session *s, u8 dlci)
+{
+ int err = 0;
+
+ BT_DBG("session %p state %ld dlci %d", s, s->state, dlci);
+
+ if (dlci) {
+ struct rfcomm_dlc *d = rfcomm_dlc_get(s, dlci);
+ if (d) {
+ rfcomm_send_ua(s, dlci);
+
+ if (d->state == BT_CONNECT || d->state == BT_CONFIG)
+ err = ECONNREFUSED;
+ else
+ err = ECONNRESET;
+
+ d->state = BT_CLOSED;
+ __rfcomm_dlc_close(d, err);
+ } else
+ rfcomm_send_dm(s, dlci);
+
+ } else {
+ rfcomm_send_ua(s, 0);
+
+ if (s->state == BT_CONNECT)
+ err = ECONNREFUSED;
+ else
+ err = ECONNRESET;
+
+ s->state = BT_CLOSED;
+ rfcomm_session_close(s, err);
+ }
+
+ return 0;
+}
+
+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_send_ua(s, dlci);
+
+ 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);
+ }
+ return 0;
+ }
+
+ /* Notify socket layer about incomming 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_send_ua(s, dlci);
+
+ rfcomm_dlc_lock(d);
+ d->state = BT_CONNECTED;
+ d->state_change(d, 0);
+ rfcomm_dlc_unlock(d);
+ } else {
+ rfcomm_send_dm(s, dlci);
+ }
+
+ return 0;
+}
+
+static int rfcomm_apply_pn(struct rfcomm_dlc *d, int cr, struct rfcomm_pn *pn)
+{
+ 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 (cr) {
+ if (pn->flow_ctrl == 0xf0) {
+ d->tx_credits = pn->credits;
+ } else {
+ set_bit(RFCOMM_TX_THROTTLED, &d->flags);
+ d->credits = 0;
+ }
+
+ d->mtu = btohs(pn->mtu);
+ } else {
+ if (pn->flow_ctrl == 0xe0) {
+ d->tx_credits = pn->credits;
+ } else {
+ set_bit(RFCOMM_TX_THROTTLED, &d->flags);
+ d->credits = 0;
+ }
+
+ d->mtu = btohs(pn->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 incomming 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) {
+ /* request: return default setting */
+ bit_rate = RFCOMM_RPN_BR_115200;
+ data_bits = RFCOMM_RPN_DATA_8;
+ stop_bits = RFCOMM_RPN_STOP_1;
+ parity = RFCOMM_RPN_PARITY_NONE;
+ flow_ctrl = RFCOMM_RPN_FLOW_NONE;
+ xon_char = RFCOMM_RPN_XON_CHAR;
+ xoff_char = RFCOMM_RPN_XOFF_CHAR;
+
+ goto rpn_out;
+ }
+ /* check for sane values: ignore/accept bit_rate, 8 bits, 1 stop bit, no parity,
+ no flow control lines, normal XON/XOFF chars */
+ if (rpn->param_mask & 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 & 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 & 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 & RFCOMM_RPN_PM_FLOW) {
+ if (rpn->flow_ctrl != RFCOMM_RPN_FLOW_NONE) {
+ BT_DBG("RPN flow ctrl mismatch 0x%x", rpn->flow_ctrl);
+ rpn->flow_ctrl = RFCOMM_RPN_FLOW_NONE;
+ rpn_mask ^= RFCOMM_RPN_PM_FLOW;
+ }
+ }
+ if (rpn->param_mask & RFCOMM_RPN_PM_XON) {
+ if (rpn->xon_char != RFCOMM_RPN_XON_CHAR) {
+ BT_DBG("RPN XON char mismatch 0x%x", rpn->xon_char);
+ rpn->xon_char = RFCOMM_RPN_XON_CHAR;
+ rpn_mask ^= RFCOMM_RPN_PM_XON;
+ }
+ }
+ if (rpn->param_mask & RFCOMM_RPN_PM_XOFF) {
+ if (rpn->xoff_char != RFCOMM_RPN_XOFF_CHAR) {
+ BT_DBG("RPN XOFF char mismatch 0x%x", rpn->xoff_char);
+ rpn->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;
+
+ /* FIXME: 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);
+
+ if (!cr)
+ return 0;
+
+ d = rfcomm_dlc_get(s, dlci);
+ if (d) {
+ if (msc->v24_sig & RFCOMM_V24_FC && !d->credits)
+ set_bit(RFCOMM_TX_THROTTLED, &d->flags);
+ else
+ clear_bit(RFCOMM_TX_THROTTLED, &d->flags);
+
+ rfcomm_dlc_lock(d);
+ if (d->modem_status)
+ d->modem_status(d, msc->v24_sig);
+ rfcomm_dlc_unlock(d);
+
+ rfcomm_send_msc(s, 0, dlci, msc->v24_sig);
+ }
+ 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_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->credits) {
+ u8 credits = *(u8 *) skb->data; skb_pull(skb, 1);
+
+ d->tx_credits += credits;
+ if (d->tx_credits)
+ clear_bit(RFCOMM_TX_THROTTLED, &d->flags);
+ }
+
+ if (skb->len && d->state == BT_CONNECTED) {
+ rfcomm_dlc_lock(d);
+ d->rx_credits--;
+ d->data_ready(d, skb);
+ rfcomm_dlc_unlock(d);
+ return 0;
+ }
+
+drop:
+ kfree_skb(skb);
+ return 0;
+}
+
+static int rfcomm_recv_frame(struct rfcomm_session *s, struct sk_buff *skb)
+{
+ struct rfcomm_hdr *hdr = (void *) skb->data;
+ u8 type, dlci, fcs;
+
+ dlci = __get_dlci(hdr->addr);
+ type = __get_type(hdr->ctrl);
+
+ /* Trim FCS */
+ skb->len--; skb->tail--;
+ fcs = *(u8 *) skb->tail;
+
+ if (__check_fcs(skb->data, type, fcs)) {
+ BT_ERR("bad checksum in packet");
+ kfree_skb(skb);
+ return -EILSEQ;
+ }
+
+ if (__test_ea(hdr->len))
+ skb_pull(skb, 3);
+ else
+ skb_pull(skb, 4);
+
+ switch (type) {
+ case RFCOMM_SABM:
+ if (__test_pf(hdr->ctrl))
+ rfcomm_recv_sabm(s, dlci);
+ break;
+
+ case RFCOMM_DISC:
+ if (__test_pf(hdr->ctrl))
+ rfcomm_recv_disc(s, dlci);
+ break;
+
+ case RFCOMM_UA:
+ if (__test_pf(hdr->ctrl))
+ rfcomm_recv_ua(s, dlci);
+ break;
+
+ case RFCOMM_DM:
+ rfcomm_recv_dm(s, dlci);
+ break;
+
+ case RFCOMM_UIH:
+ if (dlci)
+ return rfcomm_recv_data(s, dlci, __test_pf(hdr->ctrl), skb);
+
+ rfcomm_recv_mcc(s, skb);
+ break;
+
+ default:
+ BT_ERR("Unknown packet type 0x%02x\n", type);
+ break;
+ }
+ kfree_skb(skb);
+ return 0;
+}
+
+/* ---- Connection and data processing ---- */
+
+static void rfcomm_process_connect(struct rfcomm_session *s)
+{
+ struct rfcomm_dlc *d;
+ struct list_head *p, *n;
+
+ BT_DBG("session %p state %ld", s, s->state);
+
+ list_for_each_safe(p, n, &s->dlcs) {
+ d = list_entry(p, struct rfcomm_dlc, list);
+ if (d->state == BT_CONFIG) {
+ d->mtu = s->mtu;
+ rfcomm_send_pn(s, 1, d);
+ }
+ }
+}
+
+/* Send data queued for the DLC.
+ * Return number of frames left in the queue.
+ */
+static inline int rfcomm_process_tx(struct rfcomm_dlc *d)
+{
+ struct sk_buff *skb;
+ int err;
+
+ BT_DBG("dlc %p state %ld credits %d rx_credits %d tx_credits %d",
+ d, d->state, d->credits, 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->credits) {
+ /* CFC enabled.
+ * Give them some credits */
+ if (!test_bit(RFCOMM_RX_THROTTLED, &d->flags) &&
+ d->rx_credits <= (d->credits >> 2)) {
+ rfcomm_send_credits(d->session, d->addr, d->credits - d->rx_credits);
+ d->rx_credits = d->credits;
+ }
+ } 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->credits && !d->tx_credits) {
+ /* We're out of TX credits.
+ * Set TX_THROTTLED flag to avoid unnesary wakeups by dlc_send. */
+ set_bit(RFCOMM_TX_THROTTLED, &d->flags);
+ }
+
+ return skb_queue_len(&d->tx_queue);
+}
+
+static inline void rfcomm_process_dlcs(struct rfcomm_session *s)
+{
+ struct rfcomm_dlc *d;
+ struct list_head *p, *n;
+
+ BT_DBG("session %p state %ld", s, s->state);
+
+ list_for_each_safe(p, n, &s->dlcs) {
+ d = list_entry(p, struct rfcomm_dlc, list);
+ if (test_bit(RFCOMM_TIMED_OUT, &d->flags)) {
+ __rfcomm_dlc_close(d, ETIMEDOUT);
+ continue;
+ }
+
+ if (d->state == BT_CONNECTED || d->state == BT_DISCONN)
+ rfcomm_process_tx(d);
+ }
+}
+
+static inline void rfcomm_process_rx(struct rfcomm_session *s)
+{
+ struct socket *sock = s->sock;
+ struct sock *sk = sock->sk;
+ struct sk_buff *skb;
+
+ BT_DBG("session %p state %ld qlen %d", s, s->state, skb_queue_len(&sk->receive_queue));
+
+ /* Get data directly from socket receive queue without copying it. */
+ while ((skb = skb_dequeue(&sk->receive_queue))) {
+ skb_orphan(skb);
+ rfcomm_recv_frame(s, skb);
+ }
+
+ if (sk->state == BT_CLOSED) {
+ if (!s->initiator)
+ rfcomm_session_put(s);
+
+ rfcomm_session_close(s, sk->err);
+ }
+}
+
+static inline void rfcomm_accept_connection(struct rfcomm_session *s)
+{
+ struct socket *sock = s->sock, *nsock;
+ int err;
+
+ /* Fast check for a new connection.
+ * Avoids unnesesary socket allocations. */
+ if (list_empty(&bluez_pi(sock->sk)->accept_q))
+ return;
+
+ BT_DBG("session %p", s);
+
+ nsock = sock_alloc();
+ if (!nsock)
+ return;
+
+ nsock->type = sock->type;
+ nsock->ops = sock->ops;
+
+ err = sock->ops->accept(sock, nsock, O_NONBLOCK);
+ if (err < 0) {
+ sock_release(nsock);
+ return;
+ }
+
+ /* Set our callbacks */
+ nsock->sk->data_ready = rfcomm_l2data_ready;
+ nsock->sk->state_change = rfcomm_l2state_change;
+
+ s = rfcomm_session_add(nsock, BT_OPEN);
+ if (s)
+ rfcomm_session_hold(s);
+ else
+ sock_release(nsock);
+}
+
+static inline void rfcomm_check_connection(struct rfcomm_session *s)
+{
+ struct sock *sk = s->sock->sk;
+
+ BT_DBG("%p state %ld", s, s->state);
+
+ switch(sk->state) {
+ case BT_CONNECTED:
+ s->state = BT_CONNECT;
+
+ /* We can adjust MTU on outgoing sessions.
+ * L2CAP MTU minus UIH header and FCS. */
+ s->mtu = min(l2cap_pi(sk)->omtu, l2cap_pi(sk)->imtu) - 5;
+
+ rfcomm_send_sabm(s, 0);
+ break;
+
+ case BT_CLOSED:
+ s->state = BT_CLOSED;
+ rfcomm_session_close(s, sk->err);
+ break;
+ }
+}
+
+static inline void rfcomm_process_sessions(void)
+{
+ struct list_head *p, *n;
+
+ rfcomm_lock();
+
+ list_for_each_safe(p, n, &session_list) {
+ struct rfcomm_session *s;
+ s = list_entry(p, struct rfcomm_session, list);
+
+ if (s->state == BT_LISTEN) {
+ rfcomm_accept_connection(s);
+ continue;
+ }
+
+ rfcomm_session_hold(s);
+
+ switch (s->state) {
+ case BT_BOUND:
+ rfcomm_check_connection(s);
+ break;
+
+ default:
+ rfcomm_process_rx(s);
+ break;
+ }
+
+ rfcomm_process_dlcs(s);
+
+ rfcomm_session_put(s);
+ }
+
+ rfcomm_unlock();
+}
+
+static void rfcomm_worker(void)
+{
+ BT_DBG("");
+
+ daemonize(); reparent_to_init();
+ set_fs(KERNEL_DS);
+
+ while (!atomic_read(&terminate)) {
+ BT_DBG("worker loop event 0x%lx", rfcomm_event);
+
+ if (!test_bit(RFCOMM_SCHED_WAKEUP, &rfcomm_event)) {
+ /* No pending events. Let's sleep.
+ * Incomming connections and data will wake us up. */
+ set_current_state(TASK_INTERRUPTIBLE);
+ schedule();
+ }
+
+ /* Process stuff */
+ clear_bit(RFCOMM_SCHED_WAKEUP, &rfcomm_event);
+ rfcomm_process_sessions();
+ }
+ set_current_state(TASK_RUNNING);
+ return;
+}
+
+static int rfcomm_add_listener(bdaddr_t *ba)
+{
+ struct sockaddr_l2 addr;
+ struct l2cap_options opts;
+ struct socket *sock;
+ struct rfcomm_session *s;
+ int size, 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 = htobs(RFCOMM_PSM);
+ err = sock->ops->bind(sock, (struct sockaddr *) &addr, sizeof(addr));
+ if (err < 0) {
+ BT_ERR("Bind failed %d", err);
+ goto failed;
+ }
+
+ /* Set L2CAP options */
+ size = sizeof(opts);
+ sock->ops->getsockopt(sock, SOL_L2CAP, L2CAP_OPTIONS, (void *)&opts, &size);
+
+ opts.imtu = RFCOMM_MAX_L2CAP_MTU;
+ sock->ops->setsockopt(sock, SOL_L2CAP, L2CAP_OPTIONS, (void *)&opts, size);
+
+ /* Start listening on the socket */
+ err = sock->ops->listen(sock, 10);
+ if (err) {
+ BT_ERR("Listen failed %d", err);
+ goto failed;
+ }
+
+ /* Add listening session */
+ s = rfcomm_session_add(sock, BT_LISTEN);
+ if (!s)
+ goto failed;
+
+ rfcomm_session_hold(s);
+ return 0;
+failed:
+ sock_release(sock);
+ return err;
+}
+
+static void rfcomm_kill_listener(void)
+{
+ struct rfcomm_session *s;
+ struct list_head *p, *n;
+
+ BT_DBG("");
+
+ list_for_each_safe(p, n, &session_list) {
+ s = list_entry(p, struct rfcomm_session, list);
+ rfcomm_session_del(s);
+ }
+}
+
+static int rfcomm_run(void *unused)
+{
+ rfcomm_thread = current;
+
+ atomic_inc(&running);
+
+ daemonize(); reparent_to_init();
+
+ sigfillset(¤t->blocked);
+ set_fs(KERNEL_DS);
+
+ sprintf(current->comm, "krfcommd");
+
+ BT_DBG("");
+
+ rfcomm_add_listener(BDADDR_ANY);
+
+ rfcomm_worker();
+
+ rfcomm_kill_listener();
+
+ atomic_dec(&running);
+ return 0;
+}
+
+/* ---- Proc fs support ---- */
+static int rfcomm_dlc_dump(char *buf)
+{
+ struct rfcomm_session *s;
+ struct sock *sk;
+ struct list_head *p, *pp;
+ char *ptr = buf;
+
+ rfcomm_lock();
+
+ list_for_each(p, &session_list) {
+ s = list_entry(p, struct rfcomm_session, list);
+ sk = s->sock->sk;
+
+ list_for_each(pp, &s->dlcs) {
+ struct rfcomm_dlc *d;
+ d = list_entry(pp, struct rfcomm_dlc, list);
+
+ ptr += sprintf(ptr, "dlc %s %s %ld %d %d %d %d\n",
+ batostr(&bluez_pi(sk)->src), batostr(&bluez_pi(sk)->dst),
+ d->state, d->dlci, d->mtu, d->rx_credits, d->tx_credits);
+ }
+ }
+
+ rfcomm_unlock();
+
+ return ptr - buf;
+}
+
+extern int rfcomm_sock_dump(char *buf);
+
+static int rfcomm_read_proc(char *buf, char **start, off_t offset, int count, int *eof, void *priv)
+{
+ char *ptr = buf;
+ int len;
+
+ BT_DBG("count %d, offset %ld", count, offset);
+
+ ptr += rfcomm_dlc_dump(ptr);
+ ptr += rfcomm_sock_dump(ptr);
+ len = ptr - buf;
+
+ if (len <= count + offset)
+ *eof = 1;
+
+ *start = buf + offset;
+ len -= offset;
+
+ if (len > count)
+ len = count;
+ if (len < 0)
+ len = 0;
+
+ return len;
+}
+
+/* ---- Initialization ---- */
+int __init rfcomm_init(void)
+{
+ kernel_thread(rfcomm_run, NULL, CLONE_FS | CLONE_FILES | CLONE_SIGHAND);
+
+ rfcomm_init_sockets();
+
+#ifdef CONFIG_BLUEZ_RFCOMM_TTY
+ rfcomm_init_ttys();
+#endif
+
+ create_proc_read_entry("bluetooth/rfcomm", 0, 0, rfcomm_read_proc, NULL);
+
+ BT_INFO("BlueZ RFCOMM ver %s", VERSION);
+ BT_INFO("Copyright (C) 2002 Maxim Krasnyansky <maxk@qualcomm.com>");
+ BT_INFO("Copyright (C) 2002 Marcel Holtmann <marcel@holtmann.org>");
+ return 0;
+}
+
+void rfcomm_cleanup(void)
+{
+ /* Terminate working thread.
+ * ie. Set terminate flag and wake it up */
+ atomic_inc(&terminate);
+ rfcomm_schedule(RFCOMM_SCHED_STATE);
+
+ /* Wait until thread is running */
+ while (atomic_read(&running))
+ schedule();
+
+ remove_proc_entry("bluetooth/rfcomm", NULL);
+
+#ifdef CONFIG_BLUEZ_RFCOMM_TTY
+ rfcomm_cleanup_ttys();
+#endif
+
+ rfcomm_cleanup_sockets();
+ return;
+}
+
+module_init(rfcomm_init);
+module_exit(rfcomm_cleanup);
+
+MODULE_AUTHOR("Maxim Krasnyansky <maxk@qualcomm.com>, Marcel Holtmann <marcel@holtmann.org>");
+MODULE_DESCRIPTION("BlueZ RFCOMM ver " VERSION);
+MODULE_LICENSE("GPL");
FUNET's LINUX-ADM group, linux-adm@nic.funet.fi
TCL-scripts by Sam Shen (who was at: slshen@lbl.gov)