mirror of https://gitee.com/openkylin/linux.git
4309 lines
96 KiB
C
4309 lines
96 KiB
C
/*
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BlueZ - Bluetooth protocol stack for Linux
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Copyright (C) 2000-2001 Qualcomm Incorporated
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Copyright (C) 2009-2010 Gustavo F. Padovan <gustavo@padovan.org>
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Copyright (C) 2010 Google Inc.
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Written 2000,2001 by Maxim Krasnyansky <maxk@qualcomm.com>
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License version 2 as
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published by the Free Software Foundation;
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
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OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT OF THIRD PARTY RIGHTS.
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IN NO EVENT SHALL THE COPYRIGHT HOLDER(S) AND AUTHOR(S) BE LIABLE FOR ANY
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CLAIM, OR ANY SPECIAL INDIRECT OR CONSEQUENTIAL DAMAGES, OR ANY DAMAGES
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WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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ALL LIABILITY, INCLUDING LIABILITY FOR INFRINGEMENT OF ANY PATENTS,
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COPYRIGHTS, TRADEMARKS OR OTHER RIGHTS, RELATING TO USE OF THIS
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SOFTWARE IS DISCLAIMED.
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*/
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/* Bluetooth L2CAP core. */
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#include <linux/module.h>
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#include <linux/types.h>
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#include <linux/capability.h>
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#include <linux/errno.h>
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#include <linux/kernel.h>
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#include <linux/sched.h>
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#include <linux/slab.h>
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#include <linux/poll.h>
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#include <linux/fcntl.h>
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#include <linux/init.h>
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#include <linux/interrupt.h>
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#include <linux/socket.h>
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#include <linux/skbuff.h>
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#include <linux/list.h>
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#include <linux/device.h>
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#include <linux/debugfs.h>
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#include <linux/seq_file.h>
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#include <linux/uaccess.h>
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#include <linux/crc16.h>
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#include <net/sock.h>
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#include <asm/system.h>
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#include <asm/unaligned.h>
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#include <net/bluetooth/bluetooth.h>
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#include <net/bluetooth/hci_core.h>
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#include <net/bluetooth/l2cap.h>
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#include <net/bluetooth/smp.h>
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int disable_ertm;
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static u32 l2cap_feat_mask = L2CAP_FEAT_FIXED_CHAN;
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static u8 l2cap_fixed_chan[8] = { 0x02, };
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static LIST_HEAD(chan_list);
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static DEFINE_RWLOCK(chan_list_lock);
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static struct sk_buff *l2cap_build_cmd(struct l2cap_conn *conn,
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u8 code, u8 ident, u16 dlen, void *data);
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static void l2cap_send_cmd(struct l2cap_conn *conn, u8 ident, u8 code, u16 len,
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void *data);
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static int l2cap_build_conf_req(struct l2cap_chan *chan, void *data);
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static void l2cap_send_disconn_req(struct l2cap_conn *conn,
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struct l2cap_chan *chan, int err);
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static int l2cap_ertm_data_rcv(struct sock *sk, struct sk_buff *skb);
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/* ---- L2CAP channels ---- */
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static inline void chan_hold(struct l2cap_chan *c)
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{
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atomic_inc(&c->refcnt);
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}
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static inline void chan_put(struct l2cap_chan *c)
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{
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if (atomic_dec_and_test(&c->refcnt))
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kfree(c);
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}
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static struct l2cap_chan *__l2cap_get_chan_by_dcid(struct l2cap_conn *conn, u16 cid)
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{
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struct l2cap_chan *c;
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list_for_each_entry(c, &conn->chan_l, list) {
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if (c->dcid == cid)
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return c;
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}
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return NULL;
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}
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static struct l2cap_chan *__l2cap_get_chan_by_scid(struct l2cap_conn *conn, u16 cid)
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{
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struct l2cap_chan *c;
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list_for_each_entry(c, &conn->chan_l, list) {
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if (c->scid == cid)
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return c;
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}
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return NULL;
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}
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/* Find channel with given SCID.
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* Returns locked socket */
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static struct l2cap_chan *l2cap_get_chan_by_scid(struct l2cap_conn *conn, u16 cid)
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{
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struct l2cap_chan *c;
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read_lock(&conn->chan_lock);
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c = __l2cap_get_chan_by_scid(conn, cid);
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if (c)
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bh_lock_sock(c->sk);
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read_unlock(&conn->chan_lock);
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return c;
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}
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static struct l2cap_chan *__l2cap_get_chan_by_ident(struct l2cap_conn *conn, u8 ident)
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{
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struct l2cap_chan *c;
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list_for_each_entry(c, &conn->chan_l, list) {
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if (c->ident == ident)
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return c;
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}
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return NULL;
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}
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static inline struct l2cap_chan *l2cap_get_chan_by_ident(struct l2cap_conn *conn, u8 ident)
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{
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struct l2cap_chan *c;
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read_lock(&conn->chan_lock);
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c = __l2cap_get_chan_by_ident(conn, ident);
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if (c)
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bh_lock_sock(c->sk);
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read_unlock(&conn->chan_lock);
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return c;
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}
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static struct l2cap_chan *__l2cap_global_chan_by_addr(__le16 psm, bdaddr_t *src)
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{
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struct l2cap_chan *c;
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list_for_each_entry(c, &chan_list, global_l) {
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if (c->sport == psm && !bacmp(&bt_sk(c->sk)->src, src))
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goto found;
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}
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c = NULL;
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found:
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return c;
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}
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int l2cap_add_psm(struct l2cap_chan *chan, bdaddr_t *src, __le16 psm)
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{
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int err;
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write_lock_bh(&chan_list_lock);
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if (psm && __l2cap_global_chan_by_addr(psm, src)) {
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err = -EADDRINUSE;
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goto done;
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}
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if (psm) {
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chan->psm = psm;
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chan->sport = psm;
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err = 0;
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} else {
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u16 p;
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err = -EINVAL;
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for (p = 0x1001; p < 0x1100; p += 2)
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if (!__l2cap_global_chan_by_addr(cpu_to_le16(p), src)) {
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chan->psm = cpu_to_le16(p);
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chan->sport = cpu_to_le16(p);
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err = 0;
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break;
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}
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}
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done:
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write_unlock_bh(&chan_list_lock);
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return err;
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}
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int l2cap_add_scid(struct l2cap_chan *chan, __u16 scid)
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{
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write_lock_bh(&chan_list_lock);
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chan->scid = scid;
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write_unlock_bh(&chan_list_lock);
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return 0;
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}
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static u16 l2cap_alloc_cid(struct l2cap_conn *conn)
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{
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u16 cid = L2CAP_CID_DYN_START;
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for (; cid < L2CAP_CID_DYN_END; cid++) {
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if (!__l2cap_get_chan_by_scid(conn, cid))
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return cid;
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}
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return 0;
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}
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static void l2cap_set_timer(struct l2cap_chan *chan, struct timer_list *timer, long timeout)
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{
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BT_DBG("chan %p state %d timeout %ld", chan->sk, chan->state, timeout);
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if (!mod_timer(timer, jiffies + msecs_to_jiffies(timeout)))
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chan_hold(chan);
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}
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static void l2cap_clear_timer(struct l2cap_chan *chan, struct timer_list *timer)
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{
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BT_DBG("chan %p state %d", chan, chan->state);
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if (timer_pending(timer) && del_timer(timer))
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chan_put(chan);
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}
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static void l2cap_state_change(struct l2cap_chan *chan, int state)
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{
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chan->state = state;
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chan->ops->state_change(chan->data, state);
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}
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static void l2cap_chan_timeout(unsigned long arg)
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{
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struct l2cap_chan *chan = (struct l2cap_chan *) arg;
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struct sock *sk = chan->sk;
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int reason;
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BT_DBG("chan %p state %d", chan, chan->state);
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bh_lock_sock(sk);
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if (sock_owned_by_user(sk)) {
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/* sk is owned by user. Try again later */
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__set_chan_timer(chan, HZ / 5);
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bh_unlock_sock(sk);
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chan_put(chan);
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return;
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}
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if (chan->state == BT_CONNECTED || chan->state == BT_CONFIG)
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reason = ECONNREFUSED;
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else if (chan->state == BT_CONNECT &&
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chan->sec_level != BT_SECURITY_SDP)
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reason = ECONNREFUSED;
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else
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reason = ETIMEDOUT;
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l2cap_chan_close(chan, reason);
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bh_unlock_sock(sk);
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chan->ops->close(chan->data);
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chan_put(chan);
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}
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struct l2cap_chan *l2cap_chan_create(struct sock *sk)
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{
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struct l2cap_chan *chan;
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chan = kzalloc(sizeof(*chan), GFP_ATOMIC);
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if (!chan)
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return NULL;
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chan->sk = sk;
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write_lock_bh(&chan_list_lock);
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list_add(&chan->global_l, &chan_list);
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write_unlock_bh(&chan_list_lock);
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setup_timer(&chan->chan_timer, l2cap_chan_timeout, (unsigned long) chan);
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chan->state = BT_OPEN;
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atomic_set(&chan->refcnt, 1);
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return chan;
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}
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void l2cap_chan_destroy(struct l2cap_chan *chan)
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{
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write_lock_bh(&chan_list_lock);
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list_del(&chan->global_l);
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write_unlock_bh(&chan_list_lock);
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chan_put(chan);
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}
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static void __l2cap_chan_add(struct l2cap_conn *conn, struct l2cap_chan *chan)
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{
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BT_DBG("conn %p, psm 0x%2.2x, dcid 0x%4.4x", conn,
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chan->psm, chan->dcid);
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conn->disc_reason = 0x13;
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chan->conn = conn;
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if (chan->chan_type == L2CAP_CHAN_CONN_ORIENTED) {
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if (conn->hcon->type == LE_LINK) {
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/* LE connection */
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chan->omtu = L2CAP_LE_DEFAULT_MTU;
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chan->scid = L2CAP_CID_LE_DATA;
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chan->dcid = L2CAP_CID_LE_DATA;
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} else {
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/* Alloc CID for connection-oriented socket */
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chan->scid = l2cap_alloc_cid(conn);
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chan->omtu = L2CAP_DEFAULT_MTU;
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}
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} else if (chan->chan_type == L2CAP_CHAN_CONN_LESS) {
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/* Connectionless socket */
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chan->scid = L2CAP_CID_CONN_LESS;
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chan->dcid = L2CAP_CID_CONN_LESS;
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chan->omtu = L2CAP_DEFAULT_MTU;
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} else {
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/* Raw socket can send/recv signalling messages only */
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chan->scid = L2CAP_CID_SIGNALING;
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chan->dcid = L2CAP_CID_SIGNALING;
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chan->omtu = L2CAP_DEFAULT_MTU;
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}
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chan_hold(chan);
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list_add(&chan->list, &conn->chan_l);
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}
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/* Delete channel.
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* Must be called on the locked socket. */
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static void l2cap_chan_del(struct l2cap_chan *chan, int err)
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{
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struct sock *sk = chan->sk;
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struct l2cap_conn *conn = chan->conn;
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struct sock *parent = bt_sk(sk)->parent;
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__clear_chan_timer(chan);
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BT_DBG("chan %p, conn %p, err %d", chan, conn, err);
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if (conn) {
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/* Delete from channel list */
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write_lock_bh(&conn->chan_lock);
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list_del(&chan->list);
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write_unlock_bh(&conn->chan_lock);
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chan_put(chan);
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chan->conn = NULL;
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hci_conn_put(conn->hcon);
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}
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l2cap_state_change(chan, BT_CLOSED);
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sock_set_flag(sk, SOCK_ZAPPED);
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if (err)
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sk->sk_err = err;
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if (parent) {
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bt_accept_unlink(sk);
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parent->sk_data_ready(parent, 0);
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} else
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sk->sk_state_change(sk);
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if (!(test_bit(CONF_OUTPUT_DONE, &chan->conf_state) &&
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test_bit(CONF_INPUT_DONE, &chan->conf_state)))
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return;
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skb_queue_purge(&chan->tx_q);
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if (chan->mode == L2CAP_MODE_ERTM) {
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struct srej_list *l, *tmp;
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__clear_retrans_timer(chan);
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__clear_monitor_timer(chan);
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__clear_ack_timer(chan);
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skb_queue_purge(&chan->srej_q);
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list_for_each_entry_safe(l, tmp, &chan->srej_l, list) {
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list_del(&l->list);
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kfree(l);
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}
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}
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}
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static void l2cap_chan_cleanup_listen(struct sock *parent)
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{
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struct sock *sk;
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BT_DBG("parent %p", parent);
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/* Close not yet accepted channels */
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while ((sk = bt_accept_dequeue(parent, NULL))) {
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struct l2cap_chan *chan = l2cap_pi(sk)->chan;
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__clear_chan_timer(chan);
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lock_sock(sk);
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l2cap_chan_close(chan, ECONNRESET);
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release_sock(sk);
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chan->ops->close(chan->data);
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}
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}
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void l2cap_chan_close(struct l2cap_chan *chan, int reason)
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{
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struct l2cap_conn *conn = chan->conn;
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struct sock *sk = chan->sk;
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BT_DBG("chan %p state %d socket %p", chan, chan->state, sk->sk_socket);
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switch (chan->state) {
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case BT_LISTEN:
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l2cap_chan_cleanup_listen(sk);
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l2cap_state_change(chan, BT_CLOSED);
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sock_set_flag(sk, SOCK_ZAPPED);
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break;
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|
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case BT_CONNECTED:
|
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case BT_CONFIG:
|
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if (chan->chan_type == L2CAP_CHAN_CONN_ORIENTED &&
|
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conn->hcon->type == ACL_LINK) {
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__clear_chan_timer(chan);
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__set_chan_timer(chan, sk->sk_sndtimeo);
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l2cap_send_disconn_req(conn, chan, reason);
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} else
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l2cap_chan_del(chan, reason);
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break;
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|
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case BT_CONNECT2:
|
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if (chan->chan_type == L2CAP_CHAN_CONN_ORIENTED &&
|
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conn->hcon->type == ACL_LINK) {
|
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struct l2cap_conn_rsp rsp;
|
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__u16 result;
|
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|
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if (bt_sk(sk)->defer_setup)
|
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result = L2CAP_CR_SEC_BLOCK;
|
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else
|
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result = L2CAP_CR_BAD_PSM;
|
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l2cap_state_change(chan, BT_DISCONN);
|
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|
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rsp.scid = cpu_to_le16(chan->dcid);
|
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rsp.dcid = cpu_to_le16(chan->scid);
|
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rsp.result = cpu_to_le16(result);
|
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rsp.status = cpu_to_le16(L2CAP_CS_NO_INFO);
|
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l2cap_send_cmd(conn, chan->ident, L2CAP_CONN_RSP,
|
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sizeof(rsp), &rsp);
|
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}
|
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|
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l2cap_chan_del(chan, reason);
|
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break;
|
|
|
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case BT_CONNECT:
|
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case BT_DISCONN:
|
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l2cap_chan_del(chan, reason);
|
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break;
|
|
|
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default:
|
|
sock_set_flag(sk, SOCK_ZAPPED);
|
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break;
|
|
}
|
|
}
|
|
|
|
static inline u8 l2cap_get_auth_type(struct l2cap_chan *chan)
|
|
{
|
|
if (chan->chan_type == L2CAP_CHAN_RAW) {
|
|
switch (chan->sec_level) {
|
|
case BT_SECURITY_HIGH:
|
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return HCI_AT_DEDICATED_BONDING_MITM;
|
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case BT_SECURITY_MEDIUM:
|
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return HCI_AT_DEDICATED_BONDING;
|
|
default:
|
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return HCI_AT_NO_BONDING;
|
|
}
|
|
} else if (chan->psm == cpu_to_le16(0x0001)) {
|
|
if (chan->sec_level == BT_SECURITY_LOW)
|
|
chan->sec_level = BT_SECURITY_SDP;
|
|
|
|
if (chan->sec_level == BT_SECURITY_HIGH)
|
|
return HCI_AT_NO_BONDING_MITM;
|
|
else
|
|
return HCI_AT_NO_BONDING;
|
|
} else {
|
|
switch (chan->sec_level) {
|
|
case BT_SECURITY_HIGH:
|
|
return HCI_AT_GENERAL_BONDING_MITM;
|
|
case BT_SECURITY_MEDIUM:
|
|
return HCI_AT_GENERAL_BONDING;
|
|
default:
|
|
return HCI_AT_NO_BONDING;
|
|
}
|
|
}
|
|
}
|
|
|
|
/* Service level security */
|
|
static inline int l2cap_check_security(struct l2cap_chan *chan)
|
|
{
|
|
struct l2cap_conn *conn = chan->conn;
|
|
__u8 auth_type;
|
|
|
|
auth_type = l2cap_get_auth_type(chan);
|
|
|
|
return hci_conn_security(conn->hcon, chan->sec_level, auth_type);
|
|
}
|
|
|
|
static u8 l2cap_get_ident(struct l2cap_conn *conn)
|
|
{
|
|
u8 id;
|
|
|
|
/* Get next available identificator.
|
|
* 1 - 128 are used by kernel.
|
|
* 129 - 199 are reserved.
|
|
* 200 - 254 are used by utilities like l2ping, etc.
|
|
*/
|
|
|
|
spin_lock_bh(&conn->lock);
|
|
|
|
if (++conn->tx_ident > 128)
|
|
conn->tx_ident = 1;
|
|
|
|
id = conn->tx_ident;
|
|
|
|
spin_unlock_bh(&conn->lock);
|
|
|
|
return id;
|
|
}
|
|
|
|
static void l2cap_send_cmd(struct l2cap_conn *conn, u8 ident, u8 code, u16 len, void *data)
|
|
{
|
|
struct sk_buff *skb = l2cap_build_cmd(conn, code, ident, len, data);
|
|
u8 flags;
|
|
|
|
BT_DBG("code 0x%2.2x", code);
|
|
|
|
if (!skb)
|
|
return;
|
|
|
|
if (lmp_no_flush_capable(conn->hcon->hdev))
|
|
flags = ACL_START_NO_FLUSH;
|
|
else
|
|
flags = ACL_START;
|
|
|
|
bt_cb(skb)->force_active = BT_POWER_FORCE_ACTIVE_ON;
|
|
|
|
hci_send_acl(conn->hcon, skb, flags);
|
|
}
|
|
|
|
static inline void l2cap_send_sframe(struct l2cap_chan *chan, u16 control)
|
|
{
|
|
struct sk_buff *skb;
|
|
struct l2cap_hdr *lh;
|
|
struct l2cap_conn *conn = chan->conn;
|
|
int count, hlen = L2CAP_HDR_SIZE + 2;
|
|
u8 flags;
|
|
|
|
if (chan->state != BT_CONNECTED)
|
|
return;
|
|
|
|
if (chan->fcs == L2CAP_FCS_CRC16)
|
|
hlen += 2;
|
|
|
|
BT_DBG("chan %p, control 0x%2.2x", chan, control);
|
|
|
|
count = min_t(unsigned int, conn->mtu, hlen);
|
|
control |= L2CAP_CTRL_FRAME_TYPE;
|
|
|
|
if (test_and_clear_bit(CONN_SEND_FBIT, &chan->conn_state))
|
|
control |= L2CAP_CTRL_FINAL;
|
|
|
|
if (test_and_clear_bit(CONN_SEND_PBIT, &chan->conn_state))
|
|
control |= L2CAP_CTRL_POLL;
|
|
|
|
skb = bt_skb_alloc(count, GFP_ATOMIC);
|
|
if (!skb)
|
|
return;
|
|
|
|
lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE);
|
|
lh->len = cpu_to_le16(hlen - L2CAP_HDR_SIZE);
|
|
lh->cid = cpu_to_le16(chan->dcid);
|
|
put_unaligned_le16(control, skb_put(skb, 2));
|
|
|
|
if (chan->fcs == L2CAP_FCS_CRC16) {
|
|
u16 fcs = crc16(0, (u8 *)lh, count - 2);
|
|
put_unaligned_le16(fcs, skb_put(skb, 2));
|
|
}
|
|
|
|
if (lmp_no_flush_capable(conn->hcon->hdev))
|
|
flags = ACL_START_NO_FLUSH;
|
|
else
|
|
flags = ACL_START;
|
|
|
|
bt_cb(skb)->force_active = chan->force_active;
|
|
|
|
hci_send_acl(chan->conn->hcon, skb, flags);
|
|
}
|
|
|
|
static inline void l2cap_send_rr_or_rnr(struct l2cap_chan *chan, u16 control)
|
|
{
|
|
if (test_bit(CONN_LOCAL_BUSY, &chan->conn_state)) {
|
|
control |= L2CAP_SUPER_RCV_NOT_READY;
|
|
set_bit(CONN_RNR_SENT, &chan->conn_state);
|
|
} else
|
|
control |= L2CAP_SUPER_RCV_READY;
|
|
|
|
control |= chan->buffer_seq << L2CAP_CTRL_REQSEQ_SHIFT;
|
|
|
|
l2cap_send_sframe(chan, control);
|
|
}
|
|
|
|
static inline int __l2cap_no_conn_pending(struct l2cap_chan *chan)
|
|
{
|
|
return !test_bit(CONF_CONNECT_PEND, &chan->conf_state);
|
|
}
|
|
|
|
static void l2cap_do_start(struct l2cap_chan *chan)
|
|
{
|
|
struct l2cap_conn *conn = chan->conn;
|
|
|
|
if (conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_SENT) {
|
|
if (!(conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_DONE))
|
|
return;
|
|
|
|
if (l2cap_check_security(chan) &&
|
|
__l2cap_no_conn_pending(chan)) {
|
|
struct l2cap_conn_req req;
|
|
req.scid = cpu_to_le16(chan->scid);
|
|
req.psm = chan->psm;
|
|
|
|
chan->ident = l2cap_get_ident(conn);
|
|
set_bit(CONF_CONNECT_PEND, &chan->conf_state);
|
|
|
|
l2cap_send_cmd(conn, chan->ident, L2CAP_CONN_REQ,
|
|
sizeof(req), &req);
|
|
}
|
|
} else {
|
|
struct l2cap_info_req req;
|
|
req.type = cpu_to_le16(L2CAP_IT_FEAT_MASK);
|
|
|
|
conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_SENT;
|
|
conn->info_ident = l2cap_get_ident(conn);
|
|
|
|
mod_timer(&conn->info_timer, jiffies +
|
|
msecs_to_jiffies(L2CAP_INFO_TIMEOUT));
|
|
|
|
l2cap_send_cmd(conn, conn->info_ident,
|
|
L2CAP_INFO_REQ, sizeof(req), &req);
|
|
}
|
|
}
|
|
|
|
static inline int l2cap_mode_supported(__u8 mode, __u32 feat_mask)
|
|
{
|
|
u32 local_feat_mask = l2cap_feat_mask;
|
|
if (!disable_ertm)
|
|
local_feat_mask |= L2CAP_FEAT_ERTM | L2CAP_FEAT_STREAMING;
|
|
|
|
switch (mode) {
|
|
case L2CAP_MODE_ERTM:
|
|
return L2CAP_FEAT_ERTM & feat_mask & local_feat_mask;
|
|
case L2CAP_MODE_STREAMING:
|
|
return L2CAP_FEAT_STREAMING & feat_mask & local_feat_mask;
|
|
default:
|
|
return 0x00;
|
|
}
|
|
}
|
|
|
|
static void l2cap_send_disconn_req(struct l2cap_conn *conn, struct l2cap_chan *chan, int err)
|
|
{
|
|
struct sock *sk;
|
|
struct l2cap_disconn_req req;
|
|
|
|
if (!conn)
|
|
return;
|
|
|
|
sk = chan->sk;
|
|
|
|
if (chan->mode == L2CAP_MODE_ERTM) {
|
|
__clear_retrans_timer(chan);
|
|
__clear_monitor_timer(chan);
|
|
__clear_ack_timer(chan);
|
|
}
|
|
|
|
req.dcid = cpu_to_le16(chan->dcid);
|
|
req.scid = cpu_to_le16(chan->scid);
|
|
l2cap_send_cmd(conn, l2cap_get_ident(conn),
|
|
L2CAP_DISCONN_REQ, sizeof(req), &req);
|
|
|
|
l2cap_state_change(chan, BT_DISCONN);
|
|
sk->sk_err = err;
|
|
}
|
|
|
|
/* ---- L2CAP connections ---- */
|
|
static void l2cap_conn_start(struct l2cap_conn *conn)
|
|
{
|
|
struct l2cap_chan *chan, *tmp;
|
|
|
|
BT_DBG("conn %p", conn);
|
|
|
|
read_lock(&conn->chan_lock);
|
|
|
|
list_for_each_entry_safe(chan, tmp, &conn->chan_l, list) {
|
|
struct sock *sk = chan->sk;
|
|
|
|
bh_lock_sock(sk);
|
|
|
|
if (chan->chan_type != L2CAP_CHAN_CONN_ORIENTED) {
|
|
bh_unlock_sock(sk);
|
|
continue;
|
|
}
|
|
|
|
if (chan->state == BT_CONNECT) {
|
|
struct l2cap_conn_req req;
|
|
|
|
if (!l2cap_check_security(chan) ||
|
|
!__l2cap_no_conn_pending(chan)) {
|
|
bh_unlock_sock(sk);
|
|
continue;
|
|
}
|
|
|
|
if (!l2cap_mode_supported(chan->mode, conn->feat_mask)
|
|
&& test_bit(CONF_STATE2_DEVICE,
|
|
&chan->conf_state)) {
|
|
/* l2cap_chan_close() calls list_del(chan)
|
|
* so release the lock */
|
|
read_unlock(&conn->chan_lock);
|
|
l2cap_chan_close(chan, ECONNRESET);
|
|
read_lock(&conn->chan_lock);
|
|
bh_unlock_sock(sk);
|
|
continue;
|
|
}
|
|
|
|
req.scid = cpu_to_le16(chan->scid);
|
|
req.psm = chan->psm;
|
|
|
|
chan->ident = l2cap_get_ident(conn);
|
|
set_bit(CONF_CONNECT_PEND, &chan->conf_state);
|
|
|
|
l2cap_send_cmd(conn, chan->ident, L2CAP_CONN_REQ,
|
|
sizeof(req), &req);
|
|
|
|
} else if (chan->state == BT_CONNECT2) {
|
|
struct l2cap_conn_rsp rsp;
|
|
char buf[128];
|
|
rsp.scid = cpu_to_le16(chan->dcid);
|
|
rsp.dcid = cpu_to_le16(chan->scid);
|
|
|
|
if (l2cap_check_security(chan)) {
|
|
if (bt_sk(sk)->defer_setup) {
|
|
struct sock *parent = bt_sk(sk)->parent;
|
|
rsp.result = cpu_to_le16(L2CAP_CR_PEND);
|
|
rsp.status = cpu_to_le16(L2CAP_CS_AUTHOR_PEND);
|
|
if (parent)
|
|
parent->sk_data_ready(parent, 0);
|
|
|
|
} else {
|
|
l2cap_state_change(chan, BT_CONFIG);
|
|
rsp.result = cpu_to_le16(L2CAP_CR_SUCCESS);
|
|
rsp.status = cpu_to_le16(L2CAP_CS_NO_INFO);
|
|
}
|
|
} else {
|
|
rsp.result = cpu_to_le16(L2CAP_CR_PEND);
|
|
rsp.status = cpu_to_le16(L2CAP_CS_AUTHEN_PEND);
|
|
}
|
|
|
|
l2cap_send_cmd(conn, chan->ident, L2CAP_CONN_RSP,
|
|
sizeof(rsp), &rsp);
|
|
|
|
if (test_bit(CONF_REQ_SENT, &chan->conf_state) ||
|
|
rsp.result != L2CAP_CR_SUCCESS) {
|
|
bh_unlock_sock(sk);
|
|
continue;
|
|
}
|
|
|
|
set_bit(CONF_REQ_SENT, &chan->conf_state);
|
|
l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ,
|
|
l2cap_build_conf_req(chan, buf), buf);
|
|
chan->num_conf_req++;
|
|
}
|
|
|
|
bh_unlock_sock(sk);
|
|
}
|
|
|
|
read_unlock(&conn->chan_lock);
|
|
}
|
|
|
|
/* Find socket with cid and source bdaddr.
|
|
* Returns closest match, locked.
|
|
*/
|
|
static struct l2cap_chan *l2cap_global_chan_by_scid(int state, __le16 cid, bdaddr_t *src)
|
|
{
|
|
struct l2cap_chan *c, *c1 = NULL;
|
|
|
|
read_lock(&chan_list_lock);
|
|
|
|
list_for_each_entry(c, &chan_list, global_l) {
|
|
struct sock *sk = c->sk;
|
|
|
|
if (state && c->state != state)
|
|
continue;
|
|
|
|
if (c->scid == cid) {
|
|
/* Exact match. */
|
|
if (!bacmp(&bt_sk(sk)->src, src)) {
|
|
read_unlock(&chan_list_lock);
|
|
return c;
|
|
}
|
|
|
|
/* Closest match */
|
|
if (!bacmp(&bt_sk(sk)->src, BDADDR_ANY))
|
|
c1 = c;
|
|
}
|
|
}
|
|
|
|
read_unlock(&chan_list_lock);
|
|
|
|
return c1;
|
|
}
|
|
|
|
static void l2cap_le_conn_ready(struct l2cap_conn *conn)
|
|
{
|
|
struct sock *parent, *sk;
|
|
struct l2cap_chan *chan, *pchan;
|
|
|
|
BT_DBG("");
|
|
|
|
/* Check if we have socket listening on cid */
|
|
pchan = l2cap_global_chan_by_scid(BT_LISTEN, L2CAP_CID_LE_DATA,
|
|
conn->src);
|
|
if (!pchan)
|
|
return;
|
|
|
|
parent = pchan->sk;
|
|
|
|
bh_lock_sock(parent);
|
|
|
|
/* Check for backlog size */
|
|
if (sk_acceptq_is_full(parent)) {
|
|
BT_DBG("backlog full %d", parent->sk_ack_backlog);
|
|
goto clean;
|
|
}
|
|
|
|
chan = pchan->ops->new_connection(pchan->data);
|
|
if (!chan)
|
|
goto clean;
|
|
|
|
sk = chan->sk;
|
|
|
|
write_lock_bh(&conn->chan_lock);
|
|
|
|
hci_conn_hold(conn->hcon);
|
|
|
|
bacpy(&bt_sk(sk)->src, conn->src);
|
|
bacpy(&bt_sk(sk)->dst, conn->dst);
|
|
|
|
bt_accept_enqueue(parent, sk);
|
|
|
|
__l2cap_chan_add(conn, chan);
|
|
|
|
__set_chan_timer(chan, sk->sk_sndtimeo);
|
|
|
|
l2cap_state_change(chan, BT_CONNECTED);
|
|
parent->sk_data_ready(parent, 0);
|
|
|
|
write_unlock_bh(&conn->chan_lock);
|
|
|
|
clean:
|
|
bh_unlock_sock(parent);
|
|
}
|
|
|
|
static void l2cap_chan_ready(struct sock *sk)
|
|
{
|
|
struct l2cap_chan *chan = l2cap_pi(sk)->chan;
|
|
struct sock *parent = bt_sk(sk)->parent;
|
|
|
|
BT_DBG("sk %p, parent %p", sk, parent);
|
|
|
|
chan->conf_state = 0;
|
|
__clear_chan_timer(chan);
|
|
|
|
l2cap_state_change(chan, BT_CONNECTED);
|
|
sk->sk_state_change(sk);
|
|
|
|
if (parent)
|
|
parent->sk_data_ready(parent, 0);
|
|
}
|
|
|
|
static void l2cap_conn_ready(struct l2cap_conn *conn)
|
|
{
|
|
struct l2cap_chan *chan;
|
|
|
|
BT_DBG("conn %p", conn);
|
|
|
|
if (!conn->hcon->out && conn->hcon->type == LE_LINK)
|
|
l2cap_le_conn_ready(conn);
|
|
|
|
if (conn->hcon->out && conn->hcon->type == LE_LINK)
|
|
smp_conn_security(conn, conn->hcon->pending_sec_level);
|
|
|
|
read_lock(&conn->chan_lock);
|
|
|
|
list_for_each_entry(chan, &conn->chan_l, list) {
|
|
struct sock *sk = chan->sk;
|
|
|
|
bh_lock_sock(sk);
|
|
|
|
if (conn->hcon->type == LE_LINK) {
|
|
if (smp_conn_security(conn, chan->sec_level))
|
|
l2cap_chan_ready(sk);
|
|
|
|
} else if (chan->chan_type != L2CAP_CHAN_CONN_ORIENTED) {
|
|
__clear_chan_timer(chan);
|
|
l2cap_state_change(chan, BT_CONNECTED);
|
|
sk->sk_state_change(sk);
|
|
|
|
} else if (chan->state == BT_CONNECT)
|
|
l2cap_do_start(chan);
|
|
|
|
bh_unlock_sock(sk);
|
|
}
|
|
|
|
read_unlock(&conn->chan_lock);
|
|
}
|
|
|
|
/* Notify sockets that we cannot guaranty reliability anymore */
|
|
static void l2cap_conn_unreliable(struct l2cap_conn *conn, int err)
|
|
{
|
|
struct l2cap_chan *chan;
|
|
|
|
BT_DBG("conn %p", conn);
|
|
|
|
read_lock(&conn->chan_lock);
|
|
|
|
list_for_each_entry(chan, &conn->chan_l, list) {
|
|
struct sock *sk = chan->sk;
|
|
|
|
if (chan->force_reliable)
|
|
sk->sk_err = err;
|
|
}
|
|
|
|
read_unlock(&conn->chan_lock);
|
|
}
|
|
|
|
static void l2cap_info_timeout(unsigned long arg)
|
|
{
|
|
struct l2cap_conn *conn = (void *) arg;
|
|
|
|
conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE;
|
|
conn->info_ident = 0;
|
|
|
|
l2cap_conn_start(conn);
|
|
}
|
|
|
|
static void l2cap_conn_del(struct hci_conn *hcon, int err)
|
|
{
|
|
struct l2cap_conn *conn = hcon->l2cap_data;
|
|
struct l2cap_chan *chan, *l;
|
|
struct sock *sk;
|
|
|
|
if (!conn)
|
|
return;
|
|
|
|
BT_DBG("hcon %p conn %p, err %d", hcon, conn, err);
|
|
|
|
kfree_skb(conn->rx_skb);
|
|
|
|
/* Kill channels */
|
|
list_for_each_entry_safe(chan, l, &conn->chan_l, list) {
|
|
sk = chan->sk;
|
|
bh_lock_sock(sk);
|
|
l2cap_chan_del(chan, err);
|
|
bh_unlock_sock(sk);
|
|
chan->ops->close(chan->data);
|
|
}
|
|
|
|
if (conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_SENT)
|
|
del_timer_sync(&conn->info_timer);
|
|
|
|
if (test_and_clear_bit(HCI_CONN_LE_SMP_PEND, &hcon->pend)) {
|
|
del_timer(&conn->security_timer);
|
|
smp_chan_destroy(conn);
|
|
}
|
|
|
|
hcon->l2cap_data = NULL;
|
|
kfree(conn);
|
|
}
|
|
|
|
static void security_timeout(unsigned long arg)
|
|
{
|
|
struct l2cap_conn *conn = (void *) arg;
|
|
|
|
l2cap_conn_del(conn->hcon, ETIMEDOUT);
|
|
}
|
|
|
|
static struct l2cap_conn *l2cap_conn_add(struct hci_conn *hcon, u8 status)
|
|
{
|
|
struct l2cap_conn *conn = hcon->l2cap_data;
|
|
|
|
if (conn || status)
|
|
return conn;
|
|
|
|
conn = kzalloc(sizeof(struct l2cap_conn), GFP_ATOMIC);
|
|
if (!conn)
|
|
return NULL;
|
|
|
|
hcon->l2cap_data = conn;
|
|
conn->hcon = hcon;
|
|
|
|
BT_DBG("hcon %p conn %p", hcon, conn);
|
|
|
|
if (hcon->hdev->le_mtu && hcon->type == LE_LINK)
|
|
conn->mtu = hcon->hdev->le_mtu;
|
|
else
|
|
conn->mtu = hcon->hdev->acl_mtu;
|
|
|
|
conn->src = &hcon->hdev->bdaddr;
|
|
conn->dst = &hcon->dst;
|
|
|
|
conn->feat_mask = 0;
|
|
|
|
spin_lock_init(&conn->lock);
|
|
rwlock_init(&conn->chan_lock);
|
|
|
|
INIT_LIST_HEAD(&conn->chan_l);
|
|
|
|
if (hcon->type == LE_LINK)
|
|
setup_timer(&conn->security_timer, security_timeout,
|
|
(unsigned long) conn);
|
|
else
|
|
setup_timer(&conn->info_timer, l2cap_info_timeout,
|
|
(unsigned long) conn);
|
|
|
|
conn->disc_reason = 0x13;
|
|
|
|
return conn;
|
|
}
|
|
|
|
static inline void l2cap_chan_add(struct l2cap_conn *conn, struct l2cap_chan *chan)
|
|
{
|
|
write_lock_bh(&conn->chan_lock);
|
|
__l2cap_chan_add(conn, chan);
|
|
write_unlock_bh(&conn->chan_lock);
|
|
}
|
|
|
|
/* ---- Socket interface ---- */
|
|
|
|
/* Find socket with psm and source bdaddr.
|
|
* Returns closest match.
|
|
*/
|
|
static struct l2cap_chan *l2cap_global_chan_by_psm(int state, __le16 psm, bdaddr_t *src)
|
|
{
|
|
struct l2cap_chan *c, *c1 = NULL;
|
|
|
|
read_lock(&chan_list_lock);
|
|
|
|
list_for_each_entry(c, &chan_list, global_l) {
|
|
struct sock *sk = c->sk;
|
|
|
|
if (state && c->state != state)
|
|
continue;
|
|
|
|
if (c->psm == psm) {
|
|
/* Exact match. */
|
|
if (!bacmp(&bt_sk(sk)->src, src)) {
|
|
read_unlock(&chan_list_lock);
|
|
return c;
|
|
}
|
|
|
|
/* Closest match */
|
|
if (!bacmp(&bt_sk(sk)->src, BDADDR_ANY))
|
|
c1 = c;
|
|
}
|
|
}
|
|
|
|
read_unlock(&chan_list_lock);
|
|
|
|
return c1;
|
|
}
|
|
|
|
int l2cap_chan_connect(struct l2cap_chan *chan)
|
|
{
|
|
struct sock *sk = chan->sk;
|
|
bdaddr_t *src = &bt_sk(sk)->src;
|
|
bdaddr_t *dst = &bt_sk(sk)->dst;
|
|
struct l2cap_conn *conn;
|
|
struct hci_conn *hcon;
|
|
struct hci_dev *hdev;
|
|
__u8 auth_type;
|
|
int err;
|
|
|
|
BT_DBG("%s -> %s psm 0x%2.2x", batostr(src), batostr(dst),
|
|
chan->psm);
|
|
|
|
hdev = hci_get_route(dst, src);
|
|
if (!hdev)
|
|
return -EHOSTUNREACH;
|
|
|
|
hci_dev_lock_bh(hdev);
|
|
|
|
auth_type = l2cap_get_auth_type(chan);
|
|
|
|
if (chan->dcid == L2CAP_CID_LE_DATA)
|
|
hcon = hci_connect(hdev, LE_LINK, dst,
|
|
chan->sec_level, auth_type);
|
|
else
|
|
hcon = hci_connect(hdev, ACL_LINK, dst,
|
|
chan->sec_level, auth_type);
|
|
|
|
if (IS_ERR(hcon)) {
|
|
err = PTR_ERR(hcon);
|
|
goto done;
|
|
}
|
|
|
|
conn = l2cap_conn_add(hcon, 0);
|
|
if (!conn) {
|
|
hci_conn_put(hcon);
|
|
err = -ENOMEM;
|
|
goto done;
|
|
}
|
|
|
|
/* Update source addr of the socket */
|
|
bacpy(src, conn->src);
|
|
|
|
l2cap_chan_add(conn, chan);
|
|
|
|
l2cap_state_change(chan, BT_CONNECT);
|
|
__set_chan_timer(chan, sk->sk_sndtimeo);
|
|
|
|
if (hcon->state == BT_CONNECTED) {
|
|
if (chan->chan_type != L2CAP_CHAN_CONN_ORIENTED) {
|
|
__clear_chan_timer(chan);
|
|
if (l2cap_check_security(chan))
|
|
l2cap_state_change(chan, BT_CONNECTED);
|
|
} else
|
|
l2cap_do_start(chan);
|
|
}
|
|
|
|
err = 0;
|
|
|
|
done:
|
|
hci_dev_unlock_bh(hdev);
|
|
hci_dev_put(hdev);
|
|
return err;
|
|
}
|
|
|
|
int __l2cap_wait_ack(struct sock *sk)
|
|
{
|
|
struct l2cap_chan *chan = l2cap_pi(sk)->chan;
|
|
DECLARE_WAITQUEUE(wait, current);
|
|
int err = 0;
|
|
int timeo = HZ/5;
|
|
|
|
add_wait_queue(sk_sleep(sk), &wait);
|
|
set_current_state(TASK_INTERRUPTIBLE);
|
|
while (chan->unacked_frames > 0 && chan->conn) {
|
|
if (!timeo)
|
|
timeo = HZ/5;
|
|
|
|
if (signal_pending(current)) {
|
|
err = sock_intr_errno(timeo);
|
|
break;
|
|
}
|
|
|
|
release_sock(sk);
|
|
timeo = schedule_timeout(timeo);
|
|
lock_sock(sk);
|
|
set_current_state(TASK_INTERRUPTIBLE);
|
|
|
|
err = sock_error(sk);
|
|
if (err)
|
|
break;
|
|
}
|
|
set_current_state(TASK_RUNNING);
|
|
remove_wait_queue(sk_sleep(sk), &wait);
|
|
return err;
|
|
}
|
|
|
|
static void l2cap_monitor_timeout(unsigned long arg)
|
|
{
|
|
struct l2cap_chan *chan = (void *) arg;
|
|
struct sock *sk = chan->sk;
|
|
|
|
BT_DBG("chan %p", chan);
|
|
|
|
bh_lock_sock(sk);
|
|
if (chan->retry_count >= chan->remote_max_tx) {
|
|
l2cap_send_disconn_req(chan->conn, chan, ECONNABORTED);
|
|
bh_unlock_sock(sk);
|
|
return;
|
|
}
|
|
|
|
chan->retry_count++;
|
|
__set_monitor_timer(chan);
|
|
|
|
l2cap_send_rr_or_rnr(chan, L2CAP_CTRL_POLL);
|
|
bh_unlock_sock(sk);
|
|
}
|
|
|
|
static void l2cap_retrans_timeout(unsigned long arg)
|
|
{
|
|
struct l2cap_chan *chan = (void *) arg;
|
|
struct sock *sk = chan->sk;
|
|
|
|
BT_DBG("chan %p", chan);
|
|
|
|
bh_lock_sock(sk);
|
|
chan->retry_count = 1;
|
|
__set_monitor_timer(chan);
|
|
|
|
set_bit(CONN_WAIT_F, &chan->conn_state);
|
|
|
|
l2cap_send_rr_or_rnr(chan, L2CAP_CTRL_POLL);
|
|
bh_unlock_sock(sk);
|
|
}
|
|
|
|
static void l2cap_drop_acked_frames(struct l2cap_chan *chan)
|
|
{
|
|
struct sk_buff *skb;
|
|
|
|
while ((skb = skb_peek(&chan->tx_q)) &&
|
|
chan->unacked_frames) {
|
|
if (bt_cb(skb)->tx_seq == chan->expected_ack_seq)
|
|
break;
|
|
|
|
skb = skb_dequeue(&chan->tx_q);
|
|
kfree_skb(skb);
|
|
|
|
chan->unacked_frames--;
|
|
}
|
|
|
|
if (!chan->unacked_frames)
|
|
__clear_retrans_timer(chan);
|
|
}
|
|
|
|
static void l2cap_do_send(struct l2cap_chan *chan, struct sk_buff *skb)
|
|
{
|
|
struct hci_conn *hcon = chan->conn->hcon;
|
|
u16 flags;
|
|
|
|
BT_DBG("chan %p, skb %p len %d", chan, skb, skb->len);
|
|
|
|
if (!chan->flushable && lmp_no_flush_capable(hcon->hdev))
|
|
flags = ACL_START_NO_FLUSH;
|
|
else
|
|
flags = ACL_START;
|
|
|
|
bt_cb(skb)->force_active = chan->force_active;
|
|
hci_send_acl(hcon, skb, flags);
|
|
}
|
|
|
|
static void l2cap_streaming_send(struct l2cap_chan *chan)
|
|
{
|
|
struct sk_buff *skb;
|
|
u16 control, fcs;
|
|
|
|
while ((skb = skb_dequeue(&chan->tx_q))) {
|
|
control = get_unaligned_le16(skb->data + L2CAP_HDR_SIZE);
|
|
control |= chan->next_tx_seq << L2CAP_CTRL_TXSEQ_SHIFT;
|
|
put_unaligned_le16(control, skb->data + L2CAP_HDR_SIZE);
|
|
|
|
if (chan->fcs == L2CAP_FCS_CRC16) {
|
|
fcs = crc16(0, (u8 *)skb->data, skb->len - 2);
|
|
put_unaligned_le16(fcs, skb->data + skb->len - 2);
|
|
}
|
|
|
|
l2cap_do_send(chan, skb);
|
|
|
|
chan->next_tx_seq = (chan->next_tx_seq + 1) % 64;
|
|
}
|
|
}
|
|
|
|
static void l2cap_retransmit_one_frame(struct l2cap_chan *chan, u8 tx_seq)
|
|
{
|
|
struct sk_buff *skb, *tx_skb;
|
|
u16 control, fcs;
|
|
|
|
skb = skb_peek(&chan->tx_q);
|
|
if (!skb)
|
|
return;
|
|
|
|
do {
|
|
if (bt_cb(skb)->tx_seq == tx_seq)
|
|
break;
|
|
|
|
if (skb_queue_is_last(&chan->tx_q, skb))
|
|
return;
|
|
|
|
} while ((skb = skb_queue_next(&chan->tx_q, skb)));
|
|
|
|
if (chan->remote_max_tx &&
|
|
bt_cb(skb)->retries == chan->remote_max_tx) {
|
|
l2cap_send_disconn_req(chan->conn, chan, ECONNABORTED);
|
|
return;
|
|
}
|
|
|
|
tx_skb = skb_clone(skb, GFP_ATOMIC);
|
|
bt_cb(skb)->retries++;
|
|
control = get_unaligned_le16(tx_skb->data + L2CAP_HDR_SIZE);
|
|
control &= L2CAP_CTRL_SAR;
|
|
|
|
if (test_and_clear_bit(CONN_SEND_FBIT, &chan->conn_state))
|
|
control |= L2CAP_CTRL_FINAL;
|
|
|
|
control |= (chan->buffer_seq << L2CAP_CTRL_REQSEQ_SHIFT)
|
|
| (tx_seq << L2CAP_CTRL_TXSEQ_SHIFT);
|
|
|
|
put_unaligned_le16(control, tx_skb->data + L2CAP_HDR_SIZE);
|
|
|
|
if (chan->fcs == L2CAP_FCS_CRC16) {
|
|
fcs = crc16(0, (u8 *)tx_skb->data, tx_skb->len - 2);
|
|
put_unaligned_le16(fcs, tx_skb->data + tx_skb->len - 2);
|
|
}
|
|
|
|
l2cap_do_send(chan, tx_skb);
|
|
}
|
|
|
|
static int l2cap_ertm_send(struct l2cap_chan *chan)
|
|
{
|
|
struct sk_buff *skb, *tx_skb;
|
|
u16 control, fcs;
|
|
int nsent = 0;
|
|
|
|
if (chan->state != BT_CONNECTED)
|
|
return -ENOTCONN;
|
|
|
|
while ((skb = chan->tx_send_head) && (!l2cap_tx_window_full(chan))) {
|
|
|
|
if (chan->remote_max_tx &&
|
|
bt_cb(skb)->retries == chan->remote_max_tx) {
|
|
l2cap_send_disconn_req(chan->conn, chan, ECONNABORTED);
|
|
break;
|
|
}
|
|
|
|
tx_skb = skb_clone(skb, GFP_ATOMIC);
|
|
|
|
bt_cb(skb)->retries++;
|
|
|
|
control = get_unaligned_le16(tx_skb->data + L2CAP_HDR_SIZE);
|
|
control &= L2CAP_CTRL_SAR;
|
|
|
|
if (test_and_clear_bit(CONN_SEND_FBIT, &chan->conn_state))
|
|
control |= L2CAP_CTRL_FINAL;
|
|
|
|
control |= (chan->buffer_seq << L2CAP_CTRL_REQSEQ_SHIFT)
|
|
| (chan->next_tx_seq << L2CAP_CTRL_TXSEQ_SHIFT);
|
|
put_unaligned_le16(control, tx_skb->data + L2CAP_HDR_SIZE);
|
|
|
|
|
|
if (chan->fcs == L2CAP_FCS_CRC16) {
|
|
fcs = crc16(0, (u8 *)skb->data, tx_skb->len - 2);
|
|
put_unaligned_le16(fcs, skb->data + tx_skb->len - 2);
|
|
}
|
|
|
|
l2cap_do_send(chan, tx_skb);
|
|
|
|
__set_retrans_timer(chan);
|
|
|
|
bt_cb(skb)->tx_seq = chan->next_tx_seq;
|
|
chan->next_tx_seq = (chan->next_tx_seq + 1) % 64;
|
|
|
|
if (bt_cb(skb)->retries == 1)
|
|
chan->unacked_frames++;
|
|
|
|
chan->frames_sent++;
|
|
|
|
if (skb_queue_is_last(&chan->tx_q, skb))
|
|
chan->tx_send_head = NULL;
|
|
else
|
|
chan->tx_send_head = skb_queue_next(&chan->tx_q, skb);
|
|
|
|
nsent++;
|
|
}
|
|
|
|
return nsent;
|
|
}
|
|
|
|
static int l2cap_retransmit_frames(struct l2cap_chan *chan)
|
|
{
|
|
int ret;
|
|
|
|
if (!skb_queue_empty(&chan->tx_q))
|
|
chan->tx_send_head = chan->tx_q.next;
|
|
|
|
chan->next_tx_seq = chan->expected_ack_seq;
|
|
ret = l2cap_ertm_send(chan);
|
|
return ret;
|
|
}
|
|
|
|
static void l2cap_send_ack(struct l2cap_chan *chan)
|
|
{
|
|
u16 control = 0;
|
|
|
|
control |= chan->buffer_seq << L2CAP_CTRL_REQSEQ_SHIFT;
|
|
|
|
if (test_bit(CONN_LOCAL_BUSY, &chan->conn_state)) {
|
|
control |= L2CAP_SUPER_RCV_NOT_READY;
|
|
set_bit(CONN_RNR_SENT, &chan->conn_state);
|
|
l2cap_send_sframe(chan, control);
|
|
return;
|
|
}
|
|
|
|
if (l2cap_ertm_send(chan) > 0)
|
|
return;
|
|
|
|
control |= L2CAP_SUPER_RCV_READY;
|
|
l2cap_send_sframe(chan, control);
|
|
}
|
|
|
|
static void l2cap_send_srejtail(struct l2cap_chan *chan)
|
|
{
|
|
struct srej_list *tail;
|
|
u16 control;
|
|
|
|
control = L2CAP_SUPER_SELECT_REJECT;
|
|
control |= L2CAP_CTRL_FINAL;
|
|
|
|
tail = list_entry((&chan->srej_l)->prev, struct srej_list, list);
|
|
control |= tail->tx_seq << L2CAP_CTRL_REQSEQ_SHIFT;
|
|
|
|
l2cap_send_sframe(chan, control);
|
|
}
|
|
|
|
static inline int l2cap_skbuff_fromiovec(struct sock *sk, struct msghdr *msg, int len, int count, struct sk_buff *skb)
|
|
{
|
|
struct l2cap_conn *conn = l2cap_pi(sk)->chan->conn;
|
|
struct sk_buff **frag;
|
|
int err, sent = 0;
|
|
|
|
if (memcpy_fromiovec(skb_put(skb, count), msg->msg_iov, count))
|
|
return -EFAULT;
|
|
|
|
sent += count;
|
|
len -= count;
|
|
|
|
/* Continuation fragments (no L2CAP header) */
|
|
frag = &skb_shinfo(skb)->frag_list;
|
|
while (len) {
|
|
count = min_t(unsigned int, conn->mtu, len);
|
|
|
|
*frag = bt_skb_send_alloc(sk, count, msg->msg_flags & MSG_DONTWAIT, &err);
|
|
if (!*frag)
|
|
return err;
|
|
if (memcpy_fromiovec(skb_put(*frag, count), msg->msg_iov, count))
|
|
return -EFAULT;
|
|
|
|
sent += count;
|
|
len -= count;
|
|
|
|
frag = &(*frag)->next;
|
|
}
|
|
|
|
return sent;
|
|
}
|
|
|
|
static struct sk_buff *l2cap_create_connless_pdu(struct l2cap_chan *chan, struct msghdr *msg, size_t len)
|
|
{
|
|
struct sock *sk = chan->sk;
|
|
struct l2cap_conn *conn = chan->conn;
|
|
struct sk_buff *skb;
|
|
int err, count, hlen = L2CAP_HDR_SIZE + 2;
|
|
struct l2cap_hdr *lh;
|
|
|
|
BT_DBG("sk %p len %d", sk, (int)len);
|
|
|
|
count = min_t(unsigned int, (conn->mtu - hlen), len);
|
|
skb = bt_skb_send_alloc(sk, count + hlen,
|
|
msg->msg_flags & MSG_DONTWAIT, &err);
|
|
if (!skb)
|
|
return ERR_PTR(err);
|
|
|
|
/* Create L2CAP header */
|
|
lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE);
|
|
lh->cid = cpu_to_le16(chan->dcid);
|
|
lh->len = cpu_to_le16(len + (hlen - L2CAP_HDR_SIZE));
|
|
put_unaligned_le16(chan->psm, skb_put(skb, 2));
|
|
|
|
err = l2cap_skbuff_fromiovec(sk, msg, len, count, skb);
|
|
if (unlikely(err < 0)) {
|
|
kfree_skb(skb);
|
|
return ERR_PTR(err);
|
|
}
|
|
return skb;
|
|
}
|
|
|
|
static struct sk_buff *l2cap_create_basic_pdu(struct l2cap_chan *chan, struct msghdr *msg, size_t len)
|
|
{
|
|
struct sock *sk = chan->sk;
|
|
struct l2cap_conn *conn = chan->conn;
|
|
struct sk_buff *skb;
|
|
int err, count, hlen = L2CAP_HDR_SIZE;
|
|
struct l2cap_hdr *lh;
|
|
|
|
BT_DBG("sk %p len %d", sk, (int)len);
|
|
|
|
count = min_t(unsigned int, (conn->mtu - hlen), len);
|
|
skb = bt_skb_send_alloc(sk, count + hlen,
|
|
msg->msg_flags & MSG_DONTWAIT, &err);
|
|
if (!skb)
|
|
return ERR_PTR(err);
|
|
|
|
/* Create L2CAP header */
|
|
lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE);
|
|
lh->cid = cpu_to_le16(chan->dcid);
|
|
lh->len = cpu_to_le16(len + (hlen - L2CAP_HDR_SIZE));
|
|
|
|
err = l2cap_skbuff_fromiovec(sk, msg, len, count, skb);
|
|
if (unlikely(err < 0)) {
|
|
kfree_skb(skb);
|
|
return ERR_PTR(err);
|
|
}
|
|
return skb;
|
|
}
|
|
|
|
static struct sk_buff *l2cap_create_iframe_pdu(struct l2cap_chan *chan,
|
|
struct msghdr *msg, size_t len,
|
|
u16 control, u16 sdulen)
|
|
{
|
|
struct sock *sk = chan->sk;
|
|
struct l2cap_conn *conn = chan->conn;
|
|
struct sk_buff *skb;
|
|
int err, count, hlen = L2CAP_HDR_SIZE + 2;
|
|
struct l2cap_hdr *lh;
|
|
|
|
BT_DBG("sk %p len %d", sk, (int)len);
|
|
|
|
if (!conn)
|
|
return ERR_PTR(-ENOTCONN);
|
|
|
|
if (sdulen)
|
|
hlen += 2;
|
|
|
|
if (chan->fcs == L2CAP_FCS_CRC16)
|
|
hlen += 2;
|
|
|
|
count = min_t(unsigned int, (conn->mtu - hlen), len);
|
|
skb = bt_skb_send_alloc(sk, count + hlen,
|
|
msg->msg_flags & MSG_DONTWAIT, &err);
|
|
if (!skb)
|
|
return ERR_PTR(err);
|
|
|
|
/* Create L2CAP header */
|
|
lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE);
|
|
lh->cid = cpu_to_le16(chan->dcid);
|
|
lh->len = cpu_to_le16(len + (hlen - L2CAP_HDR_SIZE));
|
|
put_unaligned_le16(control, skb_put(skb, 2));
|
|
if (sdulen)
|
|
put_unaligned_le16(sdulen, skb_put(skb, 2));
|
|
|
|
err = l2cap_skbuff_fromiovec(sk, msg, len, count, skb);
|
|
if (unlikely(err < 0)) {
|
|
kfree_skb(skb);
|
|
return ERR_PTR(err);
|
|
}
|
|
|
|
if (chan->fcs == L2CAP_FCS_CRC16)
|
|
put_unaligned_le16(0, skb_put(skb, 2));
|
|
|
|
bt_cb(skb)->retries = 0;
|
|
return skb;
|
|
}
|
|
|
|
static int l2cap_sar_segment_sdu(struct l2cap_chan *chan, struct msghdr *msg, size_t len)
|
|
{
|
|
struct sk_buff *skb;
|
|
struct sk_buff_head sar_queue;
|
|
u16 control;
|
|
size_t size = 0;
|
|
|
|
skb_queue_head_init(&sar_queue);
|
|
control = L2CAP_SDU_START;
|
|
skb = l2cap_create_iframe_pdu(chan, msg, chan->remote_mps, control, len);
|
|
if (IS_ERR(skb))
|
|
return PTR_ERR(skb);
|
|
|
|
__skb_queue_tail(&sar_queue, skb);
|
|
len -= chan->remote_mps;
|
|
size += chan->remote_mps;
|
|
|
|
while (len > 0) {
|
|
size_t buflen;
|
|
|
|
if (len > chan->remote_mps) {
|
|
control = L2CAP_SDU_CONTINUE;
|
|
buflen = chan->remote_mps;
|
|
} else {
|
|
control = L2CAP_SDU_END;
|
|
buflen = len;
|
|
}
|
|
|
|
skb = l2cap_create_iframe_pdu(chan, msg, buflen, control, 0);
|
|
if (IS_ERR(skb)) {
|
|
skb_queue_purge(&sar_queue);
|
|
return PTR_ERR(skb);
|
|
}
|
|
|
|
__skb_queue_tail(&sar_queue, skb);
|
|
len -= buflen;
|
|
size += buflen;
|
|
}
|
|
skb_queue_splice_tail(&sar_queue, &chan->tx_q);
|
|
if (chan->tx_send_head == NULL)
|
|
chan->tx_send_head = sar_queue.next;
|
|
|
|
return size;
|
|
}
|
|
|
|
int l2cap_chan_send(struct l2cap_chan *chan, struct msghdr *msg, size_t len)
|
|
{
|
|
struct sk_buff *skb;
|
|
u16 control;
|
|
int err;
|
|
|
|
/* Connectionless channel */
|
|
if (chan->chan_type == L2CAP_CHAN_CONN_LESS) {
|
|
skb = l2cap_create_connless_pdu(chan, msg, len);
|
|
if (IS_ERR(skb))
|
|
return PTR_ERR(skb);
|
|
|
|
l2cap_do_send(chan, skb);
|
|
return len;
|
|
}
|
|
|
|
switch (chan->mode) {
|
|
case L2CAP_MODE_BASIC:
|
|
/* Check outgoing MTU */
|
|
if (len > chan->omtu)
|
|
return -EMSGSIZE;
|
|
|
|
/* Create a basic PDU */
|
|
skb = l2cap_create_basic_pdu(chan, msg, len);
|
|
if (IS_ERR(skb))
|
|
return PTR_ERR(skb);
|
|
|
|
l2cap_do_send(chan, skb);
|
|
err = len;
|
|
break;
|
|
|
|
case L2CAP_MODE_ERTM:
|
|
case L2CAP_MODE_STREAMING:
|
|
/* Entire SDU fits into one PDU */
|
|
if (len <= chan->remote_mps) {
|
|
control = L2CAP_SDU_UNSEGMENTED;
|
|
skb = l2cap_create_iframe_pdu(chan, msg, len, control,
|
|
0);
|
|
if (IS_ERR(skb))
|
|
return PTR_ERR(skb);
|
|
|
|
__skb_queue_tail(&chan->tx_q, skb);
|
|
|
|
if (chan->tx_send_head == NULL)
|
|
chan->tx_send_head = skb;
|
|
|
|
} else {
|
|
/* Segment SDU into multiples PDUs */
|
|
err = l2cap_sar_segment_sdu(chan, msg, len);
|
|
if (err < 0)
|
|
return err;
|
|
}
|
|
|
|
if (chan->mode == L2CAP_MODE_STREAMING) {
|
|
l2cap_streaming_send(chan);
|
|
err = len;
|
|
break;
|
|
}
|
|
|
|
if (test_bit(CONN_REMOTE_BUSY, &chan->conn_state) &&
|
|
test_bit(CONN_WAIT_F, &chan->conn_state)) {
|
|
err = len;
|
|
break;
|
|
}
|
|
|
|
err = l2cap_ertm_send(chan);
|
|
if (err >= 0)
|
|
err = len;
|
|
|
|
break;
|
|
|
|
default:
|
|
BT_DBG("bad state %1.1x", chan->mode);
|
|
err = -EBADFD;
|
|
}
|
|
|
|
return err;
|
|
}
|
|
|
|
/* Copy frame to all raw sockets on that connection */
|
|
static void l2cap_raw_recv(struct l2cap_conn *conn, struct sk_buff *skb)
|
|
{
|
|
struct sk_buff *nskb;
|
|
struct l2cap_chan *chan;
|
|
|
|
BT_DBG("conn %p", conn);
|
|
|
|
read_lock(&conn->chan_lock);
|
|
list_for_each_entry(chan, &conn->chan_l, list) {
|
|
struct sock *sk = chan->sk;
|
|
if (chan->chan_type != L2CAP_CHAN_RAW)
|
|
continue;
|
|
|
|
/* Don't send frame to the socket it came from */
|
|
if (skb->sk == sk)
|
|
continue;
|
|
nskb = skb_clone(skb, GFP_ATOMIC);
|
|
if (!nskb)
|
|
continue;
|
|
|
|
if (chan->ops->recv(chan->data, nskb))
|
|
kfree_skb(nskb);
|
|
}
|
|
read_unlock(&conn->chan_lock);
|
|
}
|
|
|
|
/* ---- L2CAP signalling commands ---- */
|
|
static struct sk_buff *l2cap_build_cmd(struct l2cap_conn *conn,
|
|
u8 code, u8 ident, u16 dlen, void *data)
|
|
{
|
|
struct sk_buff *skb, **frag;
|
|
struct l2cap_cmd_hdr *cmd;
|
|
struct l2cap_hdr *lh;
|
|
int len, count;
|
|
|
|
BT_DBG("conn %p, code 0x%2.2x, ident 0x%2.2x, len %d",
|
|
conn, code, ident, dlen);
|
|
|
|
len = L2CAP_HDR_SIZE + L2CAP_CMD_HDR_SIZE + dlen;
|
|
count = min_t(unsigned int, conn->mtu, len);
|
|
|
|
skb = bt_skb_alloc(count, GFP_ATOMIC);
|
|
if (!skb)
|
|
return NULL;
|
|
|
|
lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE);
|
|
lh->len = cpu_to_le16(L2CAP_CMD_HDR_SIZE + dlen);
|
|
|
|
if (conn->hcon->type == LE_LINK)
|
|
lh->cid = cpu_to_le16(L2CAP_CID_LE_SIGNALING);
|
|
else
|
|
lh->cid = cpu_to_le16(L2CAP_CID_SIGNALING);
|
|
|
|
cmd = (struct l2cap_cmd_hdr *) skb_put(skb, L2CAP_CMD_HDR_SIZE);
|
|
cmd->code = code;
|
|
cmd->ident = ident;
|
|
cmd->len = cpu_to_le16(dlen);
|
|
|
|
if (dlen) {
|
|
count -= L2CAP_HDR_SIZE + L2CAP_CMD_HDR_SIZE;
|
|
memcpy(skb_put(skb, count), data, count);
|
|
data += count;
|
|
}
|
|
|
|
len -= skb->len;
|
|
|
|
/* Continuation fragments (no L2CAP header) */
|
|
frag = &skb_shinfo(skb)->frag_list;
|
|
while (len) {
|
|
count = min_t(unsigned int, conn->mtu, len);
|
|
|
|
*frag = bt_skb_alloc(count, GFP_ATOMIC);
|
|
if (!*frag)
|
|
goto fail;
|
|
|
|
memcpy(skb_put(*frag, count), data, count);
|
|
|
|
len -= count;
|
|
data += count;
|
|
|
|
frag = &(*frag)->next;
|
|
}
|
|
|
|
return skb;
|
|
|
|
fail:
|
|
kfree_skb(skb);
|
|
return NULL;
|
|
}
|
|
|
|
static inline int l2cap_get_conf_opt(void **ptr, int *type, int *olen, unsigned long *val)
|
|
{
|
|
struct l2cap_conf_opt *opt = *ptr;
|
|
int len;
|
|
|
|
len = L2CAP_CONF_OPT_SIZE + opt->len;
|
|
*ptr += len;
|
|
|
|
*type = opt->type;
|
|
*olen = opt->len;
|
|
|
|
switch (opt->len) {
|
|
case 1:
|
|
*val = *((u8 *) opt->val);
|
|
break;
|
|
|
|
case 2:
|
|
*val = get_unaligned_le16(opt->val);
|
|
break;
|
|
|
|
case 4:
|
|
*val = get_unaligned_le32(opt->val);
|
|
break;
|
|
|
|
default:
|
|
*val = (unsigned long) opt->val;
|
|
break;
|
|
}
|
|
|
|
BT_DBG("type 0x%2.2x len %d val 0x%lx", *type, opt->len, *val);
|
|
return len;
|
|
}
|
|
|
|
static void l2cap_add_conf_opt(void **ptr, u8 type, u8 len, unsigned long val)
|
|
{
|
|
struct l2cap_conf_opt *opt = *ptr;
|
|
|
|
BT_DBG("type 0x%2.2x len %d val 0x%lx", type, len, val);
|
|
|
|
opt->type = type;
|
|
opt->len = len;
|
|
|
|
switch (len) {
|
|
case 1:
|
|
*((u8 *) opt->val) = val;
|
|
break;
|
|
|
|
case 2:
|
|
put_unaligned_le16(val, opt->val);
|
|
break;
|
|
|
|
case 4:
|
|
put_unaligned_le32(val, opt->val);
|
|
break;
|
|
|
|
default:
|
|
memcpy(opt->val, (void *) val, len);
|
|
break;
|
|
}
|
|
|
|
*ptr += L2CAP_CONF_OPT_SIZE + len;
|
|
}
|
|
|
|
static void l2cap_ack_timeout(unsigned long arg)
|
|
{
|
|
struct l2cap_chan *chan = (void *) arg;
|
|
|
|
bh_lock_sock(chan->sk);
|
|
l2cap_send_ack(chan);
|
|
bh_unlock_sock(chan->sk);
|
|
}
|
|
|
|
static inline void l2cap_ertm_init(struct l2cap_chan *chan)
|
|
{
|
|
struct sock *sk = chan->sk;
|
|
|
|
chan->expected_ack_seq = 0;
|
|
chan->unacked_frames = 0;
|
|
chan->buffer_seq = 0;
|
|
chan->num_acked = 0;
|
|
chan->frames_sent = 0;
|
|
|
|
setup_timer(&chan->retrans_timer, l2cap_retrans_timeout,
|
|
(unsigned long) chan);
|
|
setup_timer(&chan->monitor_timer, l2cap_monitor_timeout,
|
|
(unsigned long) chan);
|
|
setup_timer(&chan->ack_timer, l2cap_ack_timeout, (unsigned long) chan);
|
|
|
|
skb_queue_head_init(&chan->srej_q);
|
|
|
|
INIT_LIST_HEAD(&chan->srej_l);
|
|
|
|
|
|
sk->sk_backlog_rcv = l2cap_ertm_data_rcv;
|
|
}
|
|
|
|
static inline __u8 l2cap_select_mode(__u8 mode, __u16 remote_feat_mask)
|
|
{
|
|
switch (mode) {
|
|
case L2CAP_MODE_STREAMING:
|
|
case L2CAP_MODE_ERTM:
|
|
if (l2cap_mode_supported(mode, remote_feat_mask))
|
|
return mode;
|
|
/* fall through */
|
|
default:
|
|
return L2CAP_MODE_BASIC;
|
|
}
|
|
}
|
|
|
|
static int l2cap_build_conf_req(struct l2cap_chan *chan, void *data)
|
|
{
|
|
struct l2cap_conf_req *req = data;
|
|
struct l2cap_conf_rfc rfc = { .mode = chan->mode };
|
|
void *ptr = req->data;
|
|
|
|
BT_DBG("chan %p", chan);
|
|
|
|
if (chan->num_conf_req || chan->num_conf_rsp)
|
|
goto done;
|
|
|
|
switch (chan->mode) {
|
|
case L2CAP_MODE_STREAMING:
|
|
case L2CAP_MODE_ERTM:
|
|
if (test_bit(CONF_STATE2_DEVICE, &chan->conf_state))
|
|
break;
|
|
|
|
/* fall through */
|
|
default:
|
|
chan->mode = l2cap_select_mode(rfc.mode, chan->conn->feat_mask);
|
|
break;
|
|
}
|
|
|
|
done:
|
|
if (chan->imtu != L2CAP_DEFAULT_MTU)
|
|
l2cap_add_conf_opt(&ptr, L2CAP_CONF_MTU, 2, chan->imtu);
|
|
|
|
switch (chan->mode) {
|
|
case L2CAP_MODE_BASIC:
|
|
if (!(chan->conn->feat_mask & L2CAP_FEAT_ERTM) &&
|
|
!(chan->conn->feat_mask & L2CAP_FEAT_STREAMING))
|
|
break;
|
|
|
|
rfc.mode = L2CAP_MODE_BASIC;
|
|
rfc.txwin_size = 0;
|
|
rfc.max_transmit = 0;
|
|
rfc.retrans_timeout = 0;
|
|
rfc.monitor_timeout = 0;
|
|
rfc.max_pdu_size = 0;
|
|
|
|
l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, sizeof(rfc),
|
|
(unsigned long) &rfc);
|
|
break;
|
|
|
|
case L2CAP_MODE_ERTM:
|
|
rfc.mode = L2CAP_MODE_ERTM;
|
|
rfc.txwin_size = chan->tx_win;
|
|
rfc.max_transmit = chan->max_tx;
|
|
rfc.retrans_timeout = 0;
|
|
rfc.monitor_timeout = 0;
|
|
rfc.max_pdu_size = cpu_to_le16(L2CAP_DEFAULT_MAX_PDU_SIZE);
|
|
if (L2CAP_DEFAULT_MAX_PDU_SIZE > chan->conn->mtu - 10)
|
|
rfc.max_pdu_size = cpu_to_le16(chan->conn->mtu - 10);
|
|
|
|
l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, sizeof(rfc),
|
|
(unsigned long) &rfc);
|
|
|
|
if (!(chan->conn->feat_mask & L2CAP_FEAT_FCS))
|
|
break;
|
|
|
|
if (chan->fcs == L2CAP_FCS_NONE ||
|
|
test_bit(CONF_NO_FCS_RECV, &chan->conf_state)) {
|
|
chan->fcs = L2CAP_FCS_NONE;
|
|
l2cap_add_conf_opt(&ptr, L2CAP_CONF_FCS, 1, chan->fcs);
|
|
}
|
|
break;
|
|
|
|
case L2CAP_MODE_STREAMING:
|
|
rfc.mode = L2CAP_MODE_STREAMING;
|
|
rfc.txwin_size = 0;
|
|
rfc.max_transmit = 0;
|
|
rfc.retrans_timeout = 0;
|
|
rfc.monitor_timeout = 0;
|
|
rfc.max_pdu_size = cpu_to_le16(L2CAP_DEFAULT_MAX_PDU_SIZE);
|
|
if (L2CAP_DEFAULT_MAX_PDU_SIZE > chan->conn->mtu - 10)
|
|
rfc.max_pdu_size = cpu_to_le16(chan->conn->mtu - 10);
|
|
|
|
l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, sizeof(rfc),
|
|
(unsigned long) &rfc);
|
|
|
|
if (!(chan->conn->feat_mask & L2CAP_FEAT_FCS))
|
|
break;
|
|
|
|
if (chan->fcs == L2CAP_FCS_NONE ||
|
|
test_bit(CONF_NO_FCS_RECV, &chan->conf_state)) {
|
|
chan->fcs = L2CAP_FCS_NONE;
|
|
l2cap_add_conf_opt(&ptr, L2CAP_CONF_FCS, 1, chan->fcs);
|
|
}
|
|
break;
|
|
}
|
|
|
|
req->dcid = cpu_to_le16(chan->dcid);
|
|
req->flags = cpu_to_le16(0);
|
|
|
|
return ptr - data;
|
|
}
|
|
|
|
static int l2cap_parse_conf_req(struct l2cap_chan *chan, void *data)
|
|
{
|
|
struct l2cap_conf_rsp *rsp = data;
|
|
void *ptr = rsp->data;
|
|
void *req = chan->conf_req;
|
|
int len = chan->conf_len;
|
|
int type, hint, olen;
|
|
unsigned long val;
|
|
struct l2cap_conf_rfc rfc = { .mode = L2CAP_MODE_BASIC };
|
|
u16 mtu = L2CAP_DEFAULT_MTU;
|
|
u16 result = L2CAP_CONF_SUCCESS;
|
|
|
|
BT_DBG("chan %p", chan);
|
|
|
|
while (len >= L2CAP_CONF_OPT_SIZE) {
|
|
len -= l2cap_get_conf_opt(&req, &type, &olen, &val);
|
|
|
|
hint = type & L2CAP_CONF_HINT;
|
|
type &= L2CAP_CONF_MASK;
|
|
|
|
switch (type) {
|
|
case L2CAP_CONF_MTU:
|
|
mtu = val;
|
|
break;
|
|
|
|
case L2CAP_CONF_FLUSH_TO:
|
|
chan->flush_to = val;
|
|
break;
|
|
|
|
case L2CAP_CONF_QOS:
|
|
break;
|
|
|
|
case L2CAP_CONF_RFC:
|
|
if (olen == sizeof(rfc))
|
|
memcpy(&rfc, (void *) val, olen);
|
|
break;
|
|
|
|
case L2CAP_CONF_FCS:
|
|
if (val == L2CAP_FCS_NONE)
|
|
set_bit(CONF_NO_FCS_RECV, &chan->conf_state);
|
|
|
|
break;
|
|
|
|
default:
|
|
if (hint)
|
|
break;
|
|
|
|
result = L2CAP_CONF_UNKNOWN;
|
|
*((u8 *) ptr++) = type;
|
|
break;
|
|
}
|
|
}
|
|
|
|
if (chan->num_conf_rsp || chan->num_conf_req > 1)
|
|
goto done;
|
|
|
|
switch (chan->mode) {
|
|
case L2CAP_MODE_STREAMING:
|
|
case L2CAP_MODE_ERTM:
|
|
if (!test_bit(CONF_STATE2_DEVICE, &chan->conf_state)) {
|
|
chan->mode = l2cap_select_mode(rfc.mode,
|
|
chan->conn->feat_mask);
|
|
break;
|
|
}
|
|
|
|
if (chan->mode != rfc.mode)
|
|
return -ECONNREFUSED;
|
|
|
|
break;
|
|
}
|
|
|
|
done:
|
|
if (chan->mode != rfc.mode) {
|
|
result = L2CAP_CONF_UNACCEPT;
|
|
rfc.mode = chan->mode;
|
|
|
|
if (chan->num_conf_rsp == 1)
|
|
return -ECONNREFUSED;
|
|
|
|
l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC,
|
|
sizeof(rfc), (unsigned long) &rfc);
|
|
}
|
|
|
|
|
|
if (result == L2CAP_CONF_SUCCESS) {
|
|
/* Configure output options and let the other side know
|
|
* which ones we don't like. */
|
|
|
|
if (mtu < L2CAP_DEFAULT_MIN_MTU)
|
|
result = L2CAP_CONF_UNACCEPT;
|
|
else {
|
|
chan->omtu = mtu;
|
|
set_bit(CONF_MTU_DONE, &chan->conf_state);
|
|
}
|
|
l2cap_add_conf_opt(&ptr, L2CAP_CONF_MTU, 2, chan->omtu);
|
|
|
|
switch (rfc.mode) {
|
|
case L2CAP_MODE_BASIC:
|
|
chan->fcs = L2CAP_FCS_NONE;
|
|
set_bit(CONF_MODE_DONE, &chan->conf_state);
|
|
break;
|
|
|
|
case L2CAP_MODE_ERTM:
|
|
chan->remote_tx_win = rfc.txwin_size;
|
|
chan->remote_max_tx = rfc.max_transmit;
|
|
|
|
if (le16_to_cpu(rfc.max_pdu_size) > chan->conn->mtu - 10)
|
|
rfc.max_pdu_size = cpu_to_le16(chan->conn->mtu - 10);
|
|
|
|
chan->remote_mps = le16_to_cpu(rfc.max_pdu_size);
|
|
|
|
rfc.retrans_timeout =
|
|
le16_to_cpu(L2CAP_DEFAULT_RETRANS_TO);
|
|
rfc.monitor_timeout =
|
|
le16_to_cpu(L2CAP_DEFAULT_MONITOR_TO);
|
|
|
|
set_bit(CONF_MODE_DONE, &chan->conf_state);
|
|
|
|
l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC,
|
|
sizeof(rfc), (unsigned long) &rfc);
|
|
|
|
break;
|
|
|
|
case L2CAP_MODE_STREAMING:
|
|
if (le16_to_cpu(rfc.max_pdu_size) > chan->conn->mtu - 10)
|
|
rfc.max_pdu_size = cpu_to_le16(chan->conn->mtu - 10);
|
|
|
|
chan->remote_mps = le16_to_cpu(rfc.max_pdu_size);
|
|
|
|
set_bit(CONF_MODE_DONE, &chan->conf_state);
|
|
|
|
l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC,
|
|
sizeof(rfc), (unsigned long) &rfc);
|
|
|
|
break;
|
|
|
|
default:
|
|
result = L2CAP_CONF_UNACCEPT;
|
|
|
|
memset(&rfc, 0, sizeof(rfc));
|
|
rfc.mode = chan->mode;
|
|
}
|
|
|
|
if (result == L2CAP_CONF_SUCCESS)
|
|
set_bit(CONF_OUTPUT_DONE, &chan->conf_state);
|
|
}
|
|
rsp->scid = cpu_to_le16(chan->dcid);
|
|
rsp->result = cpu_to_le16(result);
|
|
rsp->flags = cpu_to_le16(0x0000);
|
|
|
|
return ptr - data;
|
|
}
|
|
|
|
static int l2cap_parse_conf_rsp(struct l2cap_chan *chan, void *rsp, int len, void *data, u16 *result)
|
|
{
|
|
struct l2cap_conf_req *req = data;
|
|
void *ptr = req->data;
|
|
int type, olen;
|
|
unsigned long val;
|
|
struct l2cap_conf_rfc rfc;
|
|
|
|
BT_DBG("chan %p, rsp %p, len %d, req %p", chan, rsp, len, data);
|
|
|
|
while (len >= L2CAP_CONF_OPT_SIZE) {
|
|
len -= l2cap_get_conf_opt(&rsp, &type, &olen, &val);
|
|
|
|
switch (type) {
|
|
case L2CAP_CONF_MTU:
|
|
if (val < L2CAP_DEFAULT_MIN_MTU) {
|
|
*result = L2CAP_CONF_UNACCEPT;
|
|
chan->imtu = L2CAP_DEFAULT_MIN_MTU;
|
|
} else
|
|
chan->imtu = val;
|
|
l2cap_add_conf_opt(&ptr, L2CAP_CONF_MTU, 2, chan->imtu);
|
|
break;
|
|
|
|
case L2CAP_CONF_FLUSH_TO:
|
|
chan->flush_to = val;
|
|
l2cap_add_conf_opt(&ptr, L2CAP_CONF_FLUSH_TO,
|
|
2, chan->flush_to);
|
|
break;
|
|
|
|
case L2CAP_CONF_RFC:
|
|
if (olen == sizeof(rfc))
|
|
memcpy(&rfc, (void *)val, olen);
|
|
|
|
if (test_bit(CONF_STATE2_DEVICE, &chan->conf_state) &&
|
|
rfc.mode != chan->mode)
|
|
return -ECONNREFUSED;
|
|
|
|
chan->fcs = 0;
|
|
|
|
l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC,
|
|
sizeof(rfc), (unsigned long) &rfc);
|
|
break;
|
|
}
|
|
}
|
|
|
|
if (chan->mode == L2CAP_MODE_BASIC && chan->mode != rfc.mode)
|
|
return -ECONNREFUSED;
|
|
|
|
chan->mode = rfc.mode;
|
|
|
|
if (*result == L2CAP_CONF_SUCCESS) {
|
|
switch (rfc.mode) {
|
|
case L2CAP_MODE_ERTM:
|
|
chan->retrans_timeout = le16_to_cpu(rfc.retrans_timeout);
|
|
chan->monitor_timeout = le16_to_cpu(rfc.monitor_timeout);
|
|
chan->mps = le16_to_cpu(rfc.max_pdu_size);
|
|
break;
|
|
case L2CAP_MODE_STREAMING:
|
|
chan->mps = le16_to_cpu(rfc.max_pdu_size);
|
|
}
|
|
}
|
|
|
|
req->dcid = cpu_to_le16(chan->dcid);
|
|
req->flags = cpu_to_le16(0x0000);
|
|
|
|
return ptr - data;
|
|
}
|
|
|
|
static int l2cap_build_conf_rsp(struct l2cap_chan *chan, void *data, u16 result, u16 flags)
|
|
{
|
|
struct l2cap_conf_rsp *rsp = data;
|
|
void *ptr = rsp->data;
|
|
|
|
BT_DBG("chan %p", chan);
|
|
|
|
rsp->scid = cpu_to_le16(chan->dcid);
|
|
rsp->result = cpu_to_le16(result);
|
|
rsp->flags = cpu_to_le16(flags);
|
|
|
|
return ptr - data;
|
|
}
|
|
|
|
void __l2cap_connect_rsp_defer(struct l2cap_chan *chan)
|
|
{
|
|
struct l2cap_conn_rsp rsp;
|
|
struct l2cap_conn *conn = chan->conn;
|
|
u8 buf[128];
|
|
|
|
rsp.scid = cpu_to_le16(chan->dcid);
|
|
rsp.dcid = cpu_to_le16(chan->scid);
|
|
rsp.result = cpu_to_le16(L2CAP_CR_SUCCESS);
|
|
rsp.status = cpu_to_le16(L2CAP_CS_NO_INFO);
|
|
l2cap_send_cmd(conn, chan->ident,
|
|
L2CAP_CONN_RSP, sizeof(rsp), &rsp);
|
|
|
|
if (test_and_set_bit(CONF_REQ_SENT, &chan->conf_state))
|
|
return;
|
|
|
|
l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ,
|
|
l2cap_build_conf_req(chan, buf), buf);
|
|
chan->num_conf_req++;
|
|
}
|
|
|
|
static void l2cap_conf_rfc_get(struct l2cap_chan *chan, void *rsp, int len)
|
|
{
|
|
int type, olen;
|
|
unsigned long val;
|
|
struct l2cap_conf_rfc rfc;
|
|
|
|
BT_DBG("chan %p, rsp %p, len %d", chan, rsp, len);
|
|
|
|
if ((chan->mode != L2CAP_MODE_ERTM) && (chan->mode != L2CAP_MODE_STREAMING))
|
|
return;
|
|
|
|
while (len >= L2CAP_CONF_OPT_SIZE) {
|
|
len -= l2cap_get_conf_opt(&rsp, &type, &olen, &val);
|
|
|
|
switch (type) {
|
|
case L2CAP_CONF_RFC:
|
|
if (olen == sizeof(rfc))
|
|
memcpy(&rfc, (void *)val, olen);
|
|
goto done;
|
|
}
|
|
}
|
|
|
|
done:
|
|
switch (rfc.mode) {
|
|
case L2CAP_MODE_ERTM:
|
|
chan->retrans_timeout = le16_to_cpu(rfc.retrans_timeout);
|
|
chan->monitor_timeout = le16_to_cpu(rfc.monitor_timeout);
|
|
chan->mps = le16_to_cpu(rfc.max_pdu_size);
|
|
break;
|
|
case L2CAP_MODE_STREAMING:
|
|
chan->mps = le16_to_cpu(rfc.max_pdu_size);
|
|
}
|
|
}
|
|
|
|
static inline int l2cap_command_rej(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data)
|
|
{
|
|
struct l2cap_cmd_rej_unk *rej = (struct l2cap_cmd_rej_unk *) data;
|
|
|
|
if (rej->reason != L2CAP_REJ_NOT_UNDERSTOOD)
|
|
return 0;
|
|
|
|
if ((conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_SENT) &&
|
|
cmd->ident == conn->info_ident) {
|
|
del_timer(&conn->info_timer);
|
|
|
|
conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE;
|
|
conn->info_ident = 0;
|
|
|
|
l2cap_conn_start(conn);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static inline int l2cap_connect_req(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data)
|
|
{
|
|
struct l2cap_conn_req *req = (struct l2cap_conn_req *) data;
|
|
struct l2cap_conn_rsp rsp;
|
|
struct l2cap_chan *chan = NULL, *pchan;
|
|
struct sock *parent, *sk = NULL;
|
|
int result, status = L2CAP_CS_NO_INFO;
|
|
|
|
u16 dcid = 0, scid = __le16_to_cpu(req->scid);
|
|
__le16 psm = req->psm;
|
|
|
|
BT_DBG("psm 0x%2.2x scid 0x%4.4x", psm, scid);
|
|
|
|
/* Check if we have socket listening on psm */
|
|
pchan = l2cap_global_chan_by_psm(BT_LISTEN, psm, conn->src);
|
|
if (!pchan) {
|
|
result = L2CAP_CR_BAD_PSM;
|
|
goto sendresp;
|
|
}
|
|
|
|
parent = pchan->sk;
|
|
|
|
bh_lock_sock(parent);
|
|
|
|
/* Check if the ACL is secure enough (if not SDP) */
|
|
if (psm != cpu_to_le16(0x0001) &&
|
|
!hci_conn_check_link_mode(conn->hcon)) {
|
|
conn->disc_reason = 0x05;
|
|
result = L2CAP_CR_SEC_BLOCK;
|
|
goto response;
|
|
}
|
|
|
|
result = L2CAP_CR_NO_MEM;
|
|
|
|
/* Check for backlog size */
|
|
if (sk_acceptq_is_full(parent)) {
|
|
BT_DBG("backlog full %d", parent->sk_ack_backlog);
|
|
goto response;
|
|
}
|
|
|
|
chan = pchan->ops->new_connection(pchan->data);
|
|
if (!chan)
|
|
goto response;
|
|
|
|
sk = chan->sk;
|
|
|
|
write_lock_bh(&conn->chan_lock);
|
|
|
|
/* Check if we already have channel with that dcid */
|
|
if (__l2cap_get_chan_by_dcid(conn, scid)) {
|
|
write_unlock_bh(&conn->chan_lock);
|
|
sock_set_flag(sk, SOCK_ZAPPED);
|
|
chan->ops->close(chan->data);
|
|
goto response;
|
|
}
|
|
|
|
hci_conn_hold(conn->hcon);
|
|
|
|
bacpy(&bt_sk(sk)->src, conn->src);
|
|
bacpy(&bt_sk(sk)->dst, conn->dst);
|
|
chan->psm = psm;
|
|
chan->dcid = scid;
|
|
|
|
bt_accept_enqueue(parent, sk);
|
|
|
|
__l2cap_chan_add(conn, chan);
|
|
|
|
dcid = chan->scid;
|
|
|
|
__set_chan_timer(chan, sk->sk_sndtimeo);
|
|
|
|
chan->ident = cmd->ident;
|
|
|
|
if (conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_DONE) {
|
|
if (l2cap_check_security(chan)) {
|
|
if (bt_sk(sk)->defer_setup) {
|
|
l2cap_state_change(chan, BT_CONNECT2);
|
|
result = L2CAP_CR_PEND;
|
|
status = L2CAP_CS_AUTHOR_PEND;
|
|
parent->sk_data_ready(parent, 0);
|
|
} else {
|
|
l2cap_state_change(chan, BT_CONFIG);
|
|
result = L2CAP_CR_SUCCESS;
|
|
status = L2CAP_CS_NO_INFO;
|
|
}
|
|
} else {
|
|
l2cap_state_change(chan, BT_CONNECT2);
|
|
result = L2CAP_CR_PEND;
|
|
status = L2CAP_CS_AUTHEN_PEND;
|
|
}
|
|
} else {
|
|
l2cap_state_change(chan, BT_CONNECT2);
|
|
result = L2CAP_CR_PEND;
|
|
status = L2CAP_CS_NO_INFO;
|
|
}
|
|
|
|
write_unlock_bh(&conn->chan_lock);
|
|
|
|
response:
|
|
bh_unlock_sock(parent);
|
|
|
|
sendresp:
|
|
rsp.scid = cpu_to_le16(scid);
|
|
rsp.dcid = cpu_to_le16(dcid);
|
|
rsp.result = cpu_to_le16(result);
|
|
rsp.status = cpu_to_le16(status);
|
|
l2cap_send_cmd(conn, cmd->ident, L2CAP_CONN_RSP, sizeof(rsp), &rsp);
|
|
|
|
if (result == L2CAP_CR_PEND && status == L2CAP_CS_NO_INFO) {
|
|
struct l2cap_info_req info;
|
|
info.type = cpu_to_le16(L2CAP_IT_FEAT_MASK);
|
|
|
|
conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_SENT;
|
|
conn->info_ident = l2cap_get_ident(conn);
|
|
|
|
mod_timer(&conn->info_timer, jiffies +
|
|
msecs_to_jiffies(L2CAP_INFO_TIMEOUT));
|
|
|
|
l2cap_send_cmd(conn, conn->info_ident,
|
|
L2CAP_INFO_REQ, sizeof(info), &info);
|
|
}
|
|
|
|
if (chan && !test_bit(CONF_REQ_SENT, &chan->conf_state) &&
|
|
result == L2CAP_CR_SUCCESS) {
|
|
u8 buf[128];
|
|
set_bit(CONF_REQ_SENT, &chan->conf_state);
|
|
l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ,
|
|
l2cap_build_conf_req(chan, buf), buf);
|
|
chan->num_conf_req++;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static inline int l2cap_connect_rsp(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data)
|
|
{
|
|
struct l2cap_conn_rsp *rsp = (struct l2cap_conn_rsp *) data;
|
|
u16 scid, dcid, result, status;
|
|
struct l2cap_chan *chan;
|
|
struct sock *sk;
|
|
u8 req[128];
|
|
|
|
scid = __le16_to_cpu(rsp->scid);
|
|
dcid = __le16_to_cpu(rsp->dcid);
|
|
result = __le16_to_cpu(rsp->result);
|
|
status = __le16_to_cpu(rsp->status);
|
|
|
|
BT_DBG("dcid 0x%4.4x scid 0x%4.4x result 0x%2.2x status 0x%2.2x", dcid, scid, result, status);
|
|
|
|
if (scid) {
|
|
chan = l2cap_get_chan_by_scid(conn, scid);
|
|
if (!chan)
|
|
return -EFAULT;
|
|
} else {
|
|
chan = l2cap_get_chan_by_ident(conn, cmd->ident);
|
|
if (!chan)
|
|
return -EFAULT;
|
|
}
|
|
|
|
sk = chan->sk;
|
|
|
|
switch (result) {
|
|
case L2CAP_CR_SUCCESS:
|
|
l2cap_state_change(chan, BT_CONFIG);
|
|
chan->ident = 0;
|
|
chan->dcid = dcid;
|
|
clear_bit(CONF_CONNECT_PEND, &chan->conf_state);
|
|
|
|
if (test_and_set_bit(CONF_REQ_SENT, &chan->conf_state))
|
|
break;
|
|
|
|
l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ,
|
|
l2cap_build_conf_req(chan, req), req);
|
|
chan->num_conf_req++;
|
|
break;
|
|
|
|
case L2CAP_CR_PEND:
|
|
set_bit(CONF_CONNECT_PEND, &chan->conf_state);
|
|
break;
|
|
|
|
default:
|
|
/* don't delete l2cap channel if sk is owned by user */
|
|
if (sock_owned_by_user(sk)) {
|
|
l2cap_state_change(chan, BT_DISCONN);
|
|
__clear_chan_timer(chan);
|
|
__set_chan_timer(chan, HZ / 5);
|
|
break;
|
|
}
|
|
|
|
l2cap_chan_del(chan, ECONNREFUSED);
|
|
break;
|
|
}
|
|
|
|
bh_unlock_sock(sk);
|
|
return 0;
|
|
}
|
|
|
|
static inline void set_default_fcs(struct l2cap_chan *chan)
|
|
{
|
|
/* FCS is enabled only in ERTM or streaming mode, if one or both
|
|
* sides request it.
|
|
*/
|
|
if (chan->mode != L2CAP_MODE_ERTM && chan->mode != L2CAP_MODE_STREAMING)
|
|
chan->fcs = L2CAP_FCS_NONE;
|
|
else if (!test_bit(CONF_NO_FCS_RECV, &chan->conf_state))
|
|
chan->fcs = L2CAP_FCS_CRC16;
|
|
}
|
|
|
|
static inline int l2cap_config_req(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u16 cmd_len, u8 *data)
|
|
{
|
|
struct l2cap_conf_req *req = (struct l2cap_conf_req *) data;
|
|
u16 dcid, flags;
|
|
u8 rsp[64];
|
|
struct l2cap_chan *chan;
|
|
struct sock *sk;
|
|
int len;
|
|
|
|
dcid = __le16_to_cpu(req->dcid);
|
|
flags = __le16_to_cpu(req->flags);
|
|
|
|
BT_DBG("dcid 0x%4.4x flags 0x%2.2x", dcid, flags);
|
|
|
|
chan = l2cap_get_chan_by_scid(conn, dcid);
|
|
if (!chan)
|
|
return -ENOENT;
|
|
|
|
sk = chan->sk;
|
|
|
|
if (chan->state != BT_CONFIG && chan->state != BT_CONNECT2) {
|
|
struct l2cap_cmd_rej_cid rej;
|
|
|
|
rej.reason = cpu_to_le16(L2CAP_REJ_INVALID_CID);
|
|
rej.scid = cpu_to_le16(chan->scid);
|
|
rej.dcid = cpu_to_le16(chan->dcid);
|
|
|
|
l2cap_send_cmd(conn, cmd->ident, L2CAP_COMMAND_REJ,
|
|
sizeof(rej), &rej);
|
|
goto unlock;
|
|
}
|
|
|
|
/* Reject if config buffer is too small. */
|
|
len = cmd_len - sizeof(*req);
|
|
if (len < 0 || chan->conf_len + len > sizeof(chan->conf_req)) {
|
|
l2cap_send_cmd(conn, cmd->ident, L2CAP_CONF_RSP,
|
|
l2cap_build_conf_rsp(chan, rsp,
|
|
L2CAP_CONF_REJECT, flags), rsp);
|
|
goto unlock;
|
|
}
|
|
|
|
/* Store config. */
|
|
memcpy(chan->conf_req + chan->conf_len, req->data, len);
|
|
chan->conf_len += len;
|
|
|
|
if (flags & 0x0001) {
|
|
/* Incomplete config. Send empty response. */
|
|
l2cap_send_cmd(conn, cmd->ident, L2CAP_CONF_RSP,
|
|
l2cap_build_conf_rsp(chan, rsp,
|
|
L2CAP_CONF_SUCCESS, 0x0001), rsp);
|
|
goto unlock;
|
|
}
|
|
|
|
/* Complete config. */
|
|
len = l2cap_parse_conf_req(chan, rsp);
|
|
if (len < 0) {
|
|
l2cap_send_disconn_req(conn, chan, ECONNRESET);
|
|
goto unlock;
|
|
}
|
|
|
|
l2cap_send_cmd(conn, cmd->ident, L2CAP_CONF_RSP, len, rsp);
|
|
chan->num_conf_rsp++;
|
|
|
|
/* Reset config buffer. */
|
|
chan->conf_len = 0;
|
|
|
|
if (!test_bit(CONF_OUTPUT_DONE, &chan->conf_state))
|
|
goto unlock;
|
|
|
|
if (test_bit(CONF_INPUT_DONE, &chan->conf_state)) {
|
|
set_default_fcs(chan);
|
|
|
|
l2cap_state_change(chan, BT_CONNECTED);
|
|
|
|
chan->next_tx_seq = 0;
|
|
chan->expected_tx_seq = 0;
|
|
skb_queue_head_init(&chan->tx_q);
|
|
if (chan->mode == L2CAP_MODE_ERTM)
|
|
l2cap_ertm_init(chan);
|
|
|
|
l2cap_chan_ready(sk);
|
|
goto unlock;
|
|
}
|
|
|
|
if (!test_and_set_bit(CONF_REQ_SENT, &chan->conf_state)) {
|
|
u8 buf[64];
|
|
l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ,
|
|
l2cap_build_conf_req(chan, buf), buf);
|
|
chan->num_conf_req++;
|
|
}
|
|
|
|
unlock:
|
|
bh_unlock_sock(sk);
|
|
return 0;
|
|
}
|
|
|
|
static inline int l2cap_config_rsp(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data)
|
|
{
|
|
struct l2cap_conf_rsp *rsp = (struct l2cap_conf_rsp *)data;
|
|
u16 scid, flags, result;
|
|
struct l2cap_chan *chan;
|
|
struct sock *sk;
|
|
int len = cmd->len - sizeof(*rsp);
|
|
|
|
scid = __le16_to_cpu(rsp->scid);
|
|
flags = __le16_to_cpu(rsp->flags);
|
|
result = __le16_to_cpu(rsp->result);
|
|
|
|
BT_DBG("scid 0x%4.4x flags 0x%2.2x result 0x%2.2x",
|
|
scid, flags, result);
|
|
|
|
chan = l2cap_get_chan_by_scid(conn, scid);
|
|
if (!chan)
|
|
return 0;
|
|
|
|
sk = chan->sk;
|
|
|
|
switch (result) {
|
|
case L2CAP_CONF_SUCCESS:
|
|
l2cap_conf_rfc_get(chan, rsp->data, len);
|
|
break;
|
|
|
|
case L2CAP_CONF_UNACCEPT:
|
|
if (chan->num_conf_rsp <= L2CAP_CONF_MAX_CONF_RSP) {
|
|
char req[64];
|
|
|
|
if (len > sizeof(req) - sizeof(struct l2cap_conf_req)) {
|
|
l2cap_send_disconn_req(conn, chan, ECONNRESET);
|
|
goto done;
|
|
}
|
|
|
|
/* throw out any old stored conf requests */
|
|
result = L2CAP_CONF_SUCCESS;
|
|
len = l2cap_parse_conf_rsp(chan, rsp->data, len,
|
|
req, &result);
|
|
if (len < 0) {
|
|
l2cap_send_disconn_req(conn, chan, ECONNRESET);
|
|
goto done;
|
|
}
|
|
|
|
l2cap_send_cmd(conn, l2cap_get_ident(conn),
|
|
L2CAP_CONF_REQ, len, req);
|
|
chan->num_conf_req++;
|
|
if (result != L2CAP_CONF_SUCCESS)
|
|
goto done;
|
|
break;
|
|
}
|
|
|
|
default:
|
|
sk->sk_err = ECONNRESET;
|
|
__set_chan_timer(chan, HZ * 5);
|
|
l2cap_send_disconn_req(conn, chan, ECONNRESET);
|
|
goto done;
|
|
}
|
|
|
|
if (flags & 0x01)
|
|
goto done;
|
|
|
|
set_bit(CONF_INPUT_DONE, &chan->conf_state);
|
|
|
|
if (test_bit(CONF_OUTPUT_DONE, &chan->conf_state)) {
|
|
set_default_fcs(chan);
|
|
|
|
l2cap_state_change(chan, BT_CONNECTED);
|
|
chan->next_tx_seq = 0;
|
|
chan->expected_tx_seq = 0;
|
|
skb_queue_head_init(&chan->tx_q);
|
|
if (chan->mode == L2CAP_MODE_ERTM)
|
|
l2cap_ertm_init(chan);
|
|
|
|
l2cap_chan_ready(sk);
|
|
}
|
|
|
|
done:
|
|
bh_unlock_sock(sk);
|
|
return 0;
|
|
}
|
|
|
|
static inline int l2cap_disconnect_req(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data)
|
|
{
|
|
struct l2cap_disconn_req *req = (struct l2cap_disconn_req *) data;
|
|
struct l2cap_disconn_rsp rsp;
|
|
u16 dcid, scid;
|
|
struct l2cap_chan *chan;
|
|
struct sock *sk;
|
|
|
|
scid = __le16_to_cpu(req->scid);
|
|
dcid = __le16_to_cpu(req->dcid);
|
|
|
|
BT_DBG("scid 0x%4.4x dcid 0x%4.4x", scid, dcid);
|
|
|
|
chan = l2cap_get_chan_by_scid(conn, dcid);
|
|
if (!chan)
|
|
return 0;
|
|
|
|
sk = chan->sk;
|
|
|
|
rsp.dcid = cpu_to_le16(chan->scid);
|
|
rsp.scid = cpu_to_le16(chan->dcid);
|
|
l2cap_send_cmd(conn, cmd->ident, L2CAP_DISCONN_RSP, sizeof(rsp), &rsp);
|
|
|
|
sk->sk_shutdown = SHUTDOWN_MASK;
|
|
|
|
/* don't delete l2cap channel if sk is owned by user */
|
|
if (sock_owned_by_user(sk)) {
|
|
l2cap_state_change(chan, BT_DISCONN);
|
|
__clear_chan_timer(chan);
|
|
__set_chan_timer(chan, HZ / 5);
|
|
bh_unlock_sock(sk);
|
|
return 0;
|
|
}
|
|
|
|
l2cap_chan_del(chan, ECONNRESET);
|
|
bh_unlock_sock(sk);
|
|
|
|
chan->ops->close(chan->data);
|
|
return 0;
|
|
}
|
|
|
|
static inline int l2cap_disconnect_rsp(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data)
|
|
{
|
|
struct l2cap_disconn_rsp *rsp = (struct l2cap_disconn_rsp *) data;
|
|
u16 dcid, scid;
|
|
struct l2cap_chan *chan;
|
|
struct sock *sk;
|
|
|
|
scid = __le16_to_cpu(rsp->scid);
|
|
dcid = __le16_to_cpu(rsp->dcid);
|
|
|
|
BT_DBG("dcid 0x%4.4x scid 0x%4.4x", dcid, scid);
|
|
|
|
chan = l2cap_get_chan_by_scid(conn, scid);
|
|
if (!chan)
|
|
return 0;
|
|
|
|
sk = chan->sk;
|
|
|
|
/* don't delete l2cap channel if sk is owned by user */
|
|
if (sock_owned_by_user(sk)) {
|
|
l2cap_state_change(chan,BT_DISCONN);
|
|
__clear_chan_timer(chan);
|
|
__set_chan_timer(chan, HZ / 5);
|
|
bh_unlock_sock(sk);
|
|
return 0;
|
|
}
|
|
|
|
l2cap_chan_del(chan, 0);
|
|
bh_unlock_sock(sk);
|
|
|
|
chan->ops->close(chan->data);
|
|
return 0;
|
|
}
|
|
|
|
static inline int l2cap_information_req(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data)
|
|
{
|
|
struct l2cap_info_req *req = (struct l2cap_info_req *) data;
|
|
u16 type;
|
|
|
|
type = __le16_to_cpu(req->type);
|
|
|
|
BT_DBG("type 0x%4.4x", type);
|
|
|
|
if (type == L2CAP_IT_FEAT_MASK) {
|
|
u8 buf[8];
|
|
u32 feat_mask = l2cap_feat_mask;
|
|
struct l2cap_info_rsp *rsp = (struct l2cap_info_rsp *) buf;
|
|
rsp->type = cpu_to_le16(L2CAP_IT_FEAT_MASK);
|
|
rsp->result = cpu_to_le16(L2CAP_IR_SUCCESS);
|
|
if (!disable_ertm)
|
|
feat_mask |= L2CAP_FEAT_ERTM | L2CAP_FEAT_STREAMING
|
|
| L2CAP_FEAT_FCS;
|
|
put_unaligned_le32(feat_mask, rsp->data);
|
|
l2cap_send_cmd(conn, cmd->ident,
|
|
L2CAP_INFO_RSP, sizeof(buf), buf);
|
|
} else if (type == L2CAP_IT_FIXED_CHAN) {
|
|
u8 buf[12];
|
|
struct l2cap_info_rsp *rsp = (struct l2cap_info_rsp *) buf;
|
|
rsp->type = cpu_to_le16(L2CAP_IT_FIXED_CHAN);
|
|
rsp->result = cpu_to_le16(L2CAP_IR_SUCCESS);
|
|
memcpy(buf + 4, l2cap_fixed_chan, 8);
|
|
l2cap_send_cmd(conn, cmd->ident,
|
|
L2CAP_INFO_RSP, sizeof(buf), buf);
|
|
} else {
|
|
struct l2cap_info_rsp rsp;
|
|
rsp.type = cpu_to_le16(type);
|
|
rsp.result = cpu_to_le16(L2CAP_IR_NOTSUPP);
|
|
l2cap_send_cmd(conn, cmd->ident,
|
|
L2CAP_INFO_RSP, sizeof(rsp), &rsp);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static inline int l2cap_information_rsp(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data)
|
|
{
|
|
struct l2cap_info_rsp *rsp = (struct l2cap_info_rsp *) data;
|
|
u16 type, result;
|
|
|
|
type = __le16_to_cpu(rsp->type);
|
|
result = __le16_to_cpu(rsp->result);
|
|
|
|
BT_DBG("type 0x%4.4x result 0x%2.2x", type, result);
|
|
|
|
/* L2CAP Info req/rsp are unbound to channels, add extra checks */
|
|
if (cmd->ident != conn->info_ident ||
|
|
conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_DONE)
|
|
return 0;
|
|
|
|
del_timer(&conn->info_timer);
|
|
|
|
if (result != L2CAP_IR_SUCCESS) {
|
|
conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE;
|
|
conn->info_ident = 0;
|
|
|
|
l2cap_conn_start(conn);
|
|
|
|
return 0;
|
|
}
|
|
|
|
if (type == L2CAP_IT_FEAT_MASK) {
|
|
conn->feat_mask = get_unaligned_le32(rsp->data);
|
|
|
|
if (conn->feat_mask & L2CAP_FEAT_FIXED_CHAN) {
|
|
struct l2cap_info_req req;
|
|
req.type = cpu_to_le16(L2CAP_IT_FIXED_CHAN);
|
|
|
|
conn->info_ident = l2cap_get_ident(conn);
|
|
|
|
l2cap_send_cmd(conn, conn->info_ident,
|
|
L2CAP_INFO_REQ, sizeof(req), &req);
|
|
} else {
|
|
conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE;
|
|
conn->info_ident = 0;
|
|
|
|
l2cap_conn_start(conn);
|
|
}
|
|
} else if (type == L2CAP_IT_FIXED_CHAN) {
|
|
conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE;
|
|
conn->info_ident = 0;
|
|
|
|
l2cap_conn_start(conn);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static inline int l2cap_check_conn_param(u16 min, u16 max, u16 latency,
|
|
u16 to_multiplier)
|
|
{
|
|
u16 max_latency;
|
|
|
|
if (min > max || min < 6 || max > 3200)
|
|
return -EINVAL;
|
|
|
|
if (to_multiplier < 10 || to_multiplier > 3200)
|
|
return -EINVAL;
|
|
|
|
if (max >= to_multiplier * 8)
|
|
return -EINVAL;
|
|
|
|
max_latency = (to_multiplier * 8 / max) - 1;
|
|
if (latency > 499 || latency > max_latency)
|
|
return -EINVAL;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static inline int l2cap_conn_param_update_req(struct l2cap_conn *conn,
|
|
struct l2cap_cmd_hdr *cmd, u8 *data)
|
|
{
|
|
struct hci_conn *hcon = conn->hcon;
|
|
struct l2cap_conn_param_update_req *req;
|
|
struct l2cap_conn_param_update_rsp rsp;
|
|
u16 min, max, latency, to_multiplier, cmd_len;
|
|
int err;
|
|
|
|
if (!(hcon->link_mode & HCI_LM_MASTER))
|
|
return -EINVAL;
|
|
|
|
cmd_len = __le16_to_cpu(cmd->len);
|
|
if (cmd_len != sizeof(struct l2cap_conn_param_update_req))
|
|
return -EPROTO;
|
|
|
|
req = (struct l2cap_conn_param_update_req *) data;
|
|
min = __le16_to_cpu(req->min);
|
|
max = __le16_to_cpu(req->max);
|
|
latency = __le16_to_cpu(req->latency);
|
|
to_multiplier = __le16_to_cpu(req->to_multiplier);
|
|
|
|
BT_DBG("min 0x%4.4x max 0x%4.4x latency: 0x%4.4x Timeout: 0x%4.4x",
|
|
min, max, latency, to_multiplier);
|
|
|
|
memset(&rsp, 0, sizeof(rsp));
|
|
|
|
err = l2cap_check_conn_param(min, max, latency, to_multiplier);
|
|
if (err)
|
|
rsp.result = cpu_to_le16(L2CAP_CONN_PARAM_REJECTED);
|
|
else
|
|
rsp.result = cpu_to_le16(L2CAP_CONN_PARAM_ACCEPTED);
|
|
|
|
l2cap_send_cmd(conn, cmd->ident, L2CAP_CONN_PARAM_UPDATE_RSP,
|
|
sizeof(rsp), &rsp);
|
|
|
|
if (!err)
|
|
hci_le_conn_update(hcon, min, max, latency, to_multiplier);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static inline int l2cap_bredr_sig_cmd(struct l2cap_conn *conn,
|
|
struct l2cap_cmd_hdr *cmd, u16 cmd_len, u8 *data)
|
|
{
|
|
int err = 0;
|
|
|
|
switch (cmd->code) {
|
|
case L2CAP_COMMAND_REJ:
|
|
l2cap_command_rej(conn, cmd, data);
|
|
break;
|
|
|
|
case L2CAP_CONN_REQ:
|
|
err = l2cap_connect_req(conn, cmd, data);
|
|
break;
|
|
|
|
case L2CAP_CONN_RSP:
|
|
err = l2cap_connect_rsp(conn, cmd, data);
|
|
break;
|
|
|
|
case L2CAP_CONF_REQ:
|
|
err = l2cap_config_req(conn, cmd, cmd_len, data);
|
|
break;
|
|
|
|
case L2CAP_CONF_RSP:
|
|
err = l2cap_config_rsp(conn, cmd, data);
|
|
break;
|
|
|
|
case L2CAP_DISCONN_REQ:
|
|
err = l2cap_disconnect_req(conn, cmd, data);
|
|
break;
|
|
|
|
case L2CAP_DISCONN_RSP:
|
|
err = l2cap_disconnect_rsp(conn, cmd, data);
|
|
break;
|
|
|
|
case L2CAP_ECHO_REQ:
|
|
l2cap_send_cmd(conn, cmd->ident, L2CAP_ECHO_RSP, cmd_len, data);
|
|
break;
|
|
|
|
case L2CAP_ECHO_RSP:
|
|
break;
|
|
|
|
case L2CAP_INFO_REQ:
|
|
err = l2cap_information_req(conn, cmd, data);
|
|
break;
|
|
|
|
case L2CAP_INFO_RSP:
|
|
err = l2cap_information_rsp(conn, cmd, data);
|
|
break;
|
|
|
|
default:
|
|
BT_ERR("Unknown BR/EDR signaling command 0x%2.2x", cmd->code);
|
|
err = -EINVAL;
|
|
break;
|
|
}
|
|
|
|
return err;
|
|
}
|
|
|
|
static inline int l2cap_le_sig_cmd(struct l2cap_conn *conn,
|
|
struct l2cap_cmd_hdr *cmd, u8 *data)
|
|
{
|
|
switch (cmd->code) {
|
|
case L2CAP_COMMAND_REJ:
|
|
return 0;
|
|
|
|
case L2CAP_CONN_PARAM_UPDATE_REQ:
|
|
return l2cap_conn_param_update_req(conn, cmd, data);
|
|
|
|
case L2CAP_CONN_PARAM_UPDATE_RSP:
|
|
return 0;
|
|
|
|
default:
|
|
BT_ERR("Unknown LE signaling command 0x%2.2x", cmd->code);
|
|
return -EINVAL;
|
|
}
|
|
}
|
|
|
|
static inline void l2cap_sig_channel(struct l2cap_conn *conn,
|
|
struct sk_buff *skb)
|
|
{
|
|
u8 *data = skb->data;
|
|
int len = skb->len;
|
|
struct l2cap_cmd_hdr cmd;
|
|
int err;
|
|
|
|
l2cap_raw_recv(conn, skb);
|
|
|
|
while (len >= L2CAP_CMD_HDR_SIZE) {
|
|
u16 cmd_len;
|
|
memcpy(&cmd, data, L2CAP_CMD_HDR_SIZE);
|
|
data += L2CAP_CMD_HDR_SIZE;
|
|
len -= L2CAP_CMD_HDR_SIZE;
|
|
|
|
cmd_len = le16_to_cpu(cmd.len);
|
|
|
|
BT_DBG("code 0x%2.2x len %d id 0x%2.2x", cmd.code, cmd_len, cmd.ident);
|
|
|
|
if (cmd_len > len || !cmd.ident) {
|
|
BT_DBG("corrupted command");
|
|
break;
|
|
}
|
|
|
|
if (conn->hcon->type == LE_LINK)
|
|
err = l2cap_le_sig_cmd(conn, &cmd, data);
|
|
else
|
|
err = l2cap_bredr_sig_cmd(conn, &cmd, cmd_len, data);
|
|
|
|
if (err) {
|
|
struct l2cap_cmd_rej_unk rej;
|
|
|
|
BT_ERR("Wrong link type (%d)", err);
|
|
|
|
/* FIXME: Map err to a valid reason */
|
|
rej.reason = cpu_to_le16(L2CAP_REJ_NOT_UNDERSTOOD);
|
|
l2cap_send_cmd(conn, cmd.ident, L2CAP_COMMAND_REJ, sizeof(rej), &rej);
|
|
}
|
|
|
|
data += cmd_len;
|
|
len -= cmd_len;
|
|
}
|
|
|
|
kfree_skb(skb);
|
|
}
|
|
|
|
static int l2cap_check_fcs(struct l2cap_chan *chan, struct sk_buff *skb)
|
|
{
|
|
u16 our_fcs, rcv_fcs;
|
|
int hdr_size = L2CAP_HDR_SIZE + 2;
|
|
|
|
if (chan->fcs == L2CAP_FCS_CRC16) {
|
|
skb_trim(skb, skb->len - 2);
|
|
rcv_fcs = get_unaligned_le16(skb->data + skb->len);
|
|
our_fcs = crc16(0, skb->data - hdr_size, skb->len + hdr_size);
|
|
|
|
if (our_fcs != rcv_fcs)
|
|
return -EBADMSG;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static inline void l2cap_send_i_or_rr_or_rnr(struct l2cap_chan *chan)
|
|
{
|
|
u16 control = 0;
|
|
|
|
chan->frames_sent = 0;
|
|
|
|
control |= chan->buffer_seq << L2CAP_CTRL_REQSEQ_SHIFT;
|
|
|
|
if (test_bit(CONN_LOCAL_BUSY, &chan->conn_state)) {
|
|
control |= L2CAP_SUPER_RCV_NOT_READY;
|
|
l2cap_send_sframe(chan, control);
|
|
set_bit(CONN_RNR_SENT, &chan->conn_state);
|
|
}
|
|
|
|
if (test_bit(CONN_REMOTE_BUSY, &chan->conn_state))
|
|
l2cap_retransmit_frames(chan);
|
|
|
|
l2cap_ertm_send(chan);
|
|
|
|
if (!test_bit(CONN_LOCAL_BUSY, &chan->conn_state) &&
|
|
chan->frames_sent == 0) {
|
|
control |= L2CAP_SUPER_RCV_READY;
|
|
l2cap_send_sframe(chan, control);
|
|
}
|
|
}
|
|
|
|
static int l2cap_add_to_srej_queue(struct l2cap_chan *chan, struct sk_buff *skb, u8 tx_seq, u8 sar)
|
|
{
|
|
struct sk_buff *next_skb;
|
|
int tx_seq_offset, next_tx_seq_offset;
|
|
|
|
bt_cb(skb)->tx_seq = tx_seq;
|
|
bt_cb(skb)->sar = sar;
|
|
|
|
next_skb = skb_peek(&chan->srej_q);
|
|
if (!next_skb) {
|
|
__skb_queue_tail(&chan->srej_q, skb);
|
|
return 0;
|
|
}
|
|
|
|
tx_seq_offset = (tx_seq - chan->buffer_seq) % 64;
|
|
if (tx_seq_offset < 0)
|
|
tx_seq_offset += 64;
|
|
|
|
do {
|
|
if (bt_cb(next_skb)->tx_seq == tx_seq)
|
|
return -EINVAL;
|
|
|
|
next_tx_seq_offset = (bt_cb(next_skb)->tx_seq -
|
|
chan->buffer_seq) % 64;
|
|
if (next_tx_seq_offset < 0)
|
|
next_tx_seq_offset += 64;
|
|
|
|
if (next_tx_seq_offset > tx_seq_offset) {
|
|
__skb_queue_before(&chan->srej_q, next_skb, skb);
|
|
return 0;
|
|
}
|
|
|
|
if (skb_queue_is_last(&chan->srej_q, next_skb))
|
|
break;
|
|
|
|
} while ((next_skb = skb_queue_next(&chan->srej_q, next_skb)));
|
|
|
|
__skb_queue_tail(&chan->srej_q, skb);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void append_skb_frag(struct sk_buff *skb,
|
|
struct sk_buff *new_frag, struct sk_buff **last_frag)
|
|
{
|
|
/* skb->len reflects data in skb as well as all fragments
|
|
* skb->data_len reflects only data in fragments
|
|
*/
|
|
if (!skb_has_frag_list(skb))
|
|
skb_shinfo(skb)->frag_list = new_frag;
|
|
|
|
new_frag->next = NULL;
|
|
|
|
(*last_frag)->next = new_frag;
|
|
*last_frag = new_frag;
|
|
|
|
skb->len += new_frag->len;
|
|
skb->data_len += new_frag->len;
|
|
skb->truesize += new_frag->truesize;
|
|
}
|
|
|
|
static int l2cap_reassemble_sdu(struct l2cap_chan *chan, struct sk_buff *skb, u16 control)
|
|
{
|
|
int err = -EINVAL;
|
|
|
|
switch (control & L2CAP_CTRL_SAR) {
|
|
case L2CAP_SDU_UNSEGMENTED:
|
|
if (chan->sdu)
|
|
break;
|
|
|
|
err = chan->ops->recv(chan->data, skb);
|
|
break;
|
|
|
|
case L2CAP_SDU_START:
|
|
if (chan->sdu)
|
|
break;
|
|
|
|
chan->sdu_len = get_unaligned_le16(skb->data);
|
|
skb_pull(skb, 2);
|
|
|
|
if (chan->sdu_len > chan->imtu) {
|
|
err = -EMSGSIZE;
|
|
break;
|
|
}
|
|
|
|
if (skb->len >= chan->sdu_len)
|
|
break;
|
|
|
|
chan->sdu = skb;
|
|
chan->sdu_last_frag = skb;
|
|
|
|
skb = NULL;
|
|
err = 0;
|
|
break;
|
|
|
|
case L2CAP_SDU_CONTINUE:
|
|
if (!chan->sdu)
|
|
break;
|
|
|
|
append_skb_frag(chan->sdu, skb,
|
|
&chan->sdu_last_frag);
|
|
skb = NULL;
|
|
|
|
if (chan->sdu->len >= chan->sdu_len)
|
|
break;
|
|
|
|
err = 0;
|
|
break;
|
|
|
|
case L2CAP_SDU_END:
|
|
if (!chan->sdu)
|
|
break;
|
|
|
|
append_skb_frag(chan->sdu, skb,
|
|
&chan->sdu_last_frag);
|
|
skb = NULL;
|
|
|
|
if (chan->sdu->len != chan->sdu_len)
|
|
break;
|
|
|
|
err = chan->ops->recv(chan->data, chan->sdu);
|
|
|
|
if (!err) {
|
|
/* Reassembly complete */
|
|
chan->sdu = NULL;
|
|
chan->sdu_last_frag = NULL;
|
|
chan->sdu_len = 0;
|
|
}
|
|
break;
|
|
}
|
|
|
|
if (err) {
|
|
kfree_skb(skb);
|
|
kfree_skb(chan->sdu);
|
|
chan->sdu = NULL;
|
|
chan->sdu_last_frag = NULL;
|
|
chan->sdu_len = 0;
|
|
}
|
|
|
|
return err;
|
|
}
|
|
|
|
static void l2cap_ertm_enter_local_busy(struct l2cap_chan *chan)
|
|
{
|
|
u16 control;
|
|
|
|
BT_DBG("chan %p, Enter local busy", chan);
|
|
|
|
set_bit(CONN_LOCAL_BUSY, &chan->conn_state);
|
|
|
|
control = chan->buffer_seq << L2CAP_CTRL_REQSEQ_SHIFT;
|
|
control |= L2CAP_SUPER_RCV_NOT_READY;
|
|
l2cap_send_sframe(chan, control);
|
|
|
|
set_bit(CONN_RNR_SENT, &chan->conn_state);
|
|
|
|
__clear_ack_timer(chan);
|
|
}
|
|
|
|
static void l2cap_ertm_exit_local_busy(struct l2cap_chan *chan)
|
|
{
|
|
u16 control;
|
|
|
|
if (!test_bit(CONN_RNR_SENT, &chan->conn_state))
|
|
goto done;
|
|
|
|
control = chan->buffer_seq << L2CAP_CTRL_REQSEQ_SHIFT;
|
|
control |= L2CAP_SUPER_RCV_READY | L2CAP_CTRL_POLL;
|
|
l2cap_send_sframe(chan, control);
|
|
chan->retry_count = 1;
|
|
|
|
__clear_retrans_timer(chan);
|
|
__set_monitor_timer(chan);
|
|
|
|
set_bit(CONN_WAIT_F, &chan->conn_state);
|
|
|
|
done:
|
|
clear_bit(CONN_LOCAL_BUSY, &chan->conn_state);
|
|
clear_bit(CONN_RNR_SENT, &chan->conn_state);
|
|
|
|
BT_DBG("chan %p, Exit local busy", chan);
|
|
}
|
|
|
|
void l2cap_chan_busy(struct l2cap_chan *chan, int busy)
|
|
{
|
|
if (chan->mode == L2CAP_MODE_ERTM) {
|
|
if (busy)
|
|
l2cap_ertm_enter_local_busy(chan);
|
|
else
|
|
l2cap_ertm_exit_local_busy(chan);
|
|
}
|
|
}
|
|
|
|
static void l2cap_check_srej_gap(struct l2cap_chan *chan, u8 tx_seq)
|
|
{
|
|
struct sk_buff *skb;
|
|
u16 control;
|
|
|
|
while ((skb = skb_peek(&chan->srej_q)) &&
|
|
!test_bit(CONN_LOCAL_BUSY, &chan->conn_state)) {
|
|
int err;
|
|
|
|
if (bt_cb(skb)->tx_seq != tx_seq)
|
|
break;
|
|
|
|
skb = skb_dequeue(&chan->srej_q);
|
|
control = bt_cb(skb)->sar << L2CAP_CTRL_SAR_SHIFT;
|
|
err = l2cap_reassemble_sdu(chan, skb, control);
|
|
|
|
if (err < 0) {
|
|
l2cap_send_disconn_req(chan->conn, chan, ECONNRESET);
|
|
break;
|
|
}
|
|
|
|
chan->buffer_seq_srej =
|
|
(chan->buffer_seq_srej + 1) % 64;
|
|
tx_seq = (tx_seq + 1) % 64;
|
|
}
|
|
}
|
|
|
|
static void l2cap_resend_srejframe(struct l2cap_chan *chan, u8 tx_seq)
|
|
{
|
|
struct srej_list *l, *tmp;
|
|
u16 control;
|
|
|
|
list_for_each_entry_safe(l, tmp, &chan->srej_l, list) {
|
|
if (l->tx_seq == tx_seq) {
|
|
list_del(&l->list);
|
|
kfree(l);
|
|
return;
|
|
}
|
|
control = L2CAP_SUPER_SELECT_REJECT;
|
|
control |= l->tx_seq << L2CAP_CTRL_REQSEQ_SHIFT;
|
|
l2cap_send_sframe(chan, control);
|
|
list_del(&l->list);
|
|
list_add_tail(&l->list, &chan->srej_l);
|
|
}
|
|
}
|
|
|
|
static void l2cap_send_srejframe(struct l2cap_chan *chan, u8 tx_seq)
|
|
{
|
|
struct srej_list *new;
|
|
u16 control;
|
|
|
|
while (tx_seq != chan->expected_tx_seq) {
|
|
control = L2CAP_SUPER_SELECT_REJECT;
|
|
control |= chan->expected_tx_seq << L2CAP_CTRL_REQSEQ_SHIFT;
|
|
l2cap_send_sframe(chan, control);
|
|
|
|
new = kzalloc(sizeof(struct srej_list), GFP_ATOMIC);
|
|
new->tx_seq = chan->expected_tx_seq;
|
|
chan->expected_tx_seq = (chan->expected_tx_seq + 1) % 64;
|
|
list_add_tail(&new->list, &chan->srej_l);
|
|
}
|
|
chan->expected_tx_seq = (chan->expected_tx_seq + 1) % 64;
|
|
}
|
|
|
|
static inline int l2cap_data_channel_iframe(struct l2cap_chan *chan, u16 rx_control, struct sk_buff *skb)
|
|
{
|
|
u8 tx_seq = __get_txseq(rx_control);
|
|
u8 req_seq = __get_reqseq(rx_control);
|
|
u8 sar = rx_control >> L2CAP_CTRL_SAR_SHIFT;
|
|
int tx_seq_offset, expected_tx_seq_offset;
|
|
int num_to_ack = (chan->tx_win/6) + 1;
|
|
int err = 0;
|
|
|
|
BT_DBG("chan %p len %d tx_seq %d rx_control 0x%4.4x", chan, skb->len,
|
|
tx_seq, rx_control);
|
|
|
|
if (L2CAP_CTRL_FINAL & rx_control &&
|
|
test_bit(CONN_WAIT_F, &chan->conn_state)) {
|
|
__clear_monitor_timer(chan);
|
|
if (chan->unacked_frames > 0)
|
|
__set_retrans_timer(chan);
|
|
clear_bit(CONN_WAIT_F, &chan->conn_state);
|
|
}
|
|
|
|
chan->expected_ack_seq = req_seq;
|
|
l2cap_drop_acked_frames(chan);
|
|
|
|
tx_seq_offset = (tx_seq - chan->buffer_seq) % 64;
|
|
if (tx_seq_offset < 0)
|
|
tx_seq_offset += 64;
|
|
|
|
/* invalid tx_seq */
|
|
if (tx_seq_offset >= chan->tx_win) {
|
|
l2cap_send_disconn_req(chan->conn, chan, ECONNRESET);
|
|
goto drop;
|
|
}
|
|
|
|
if (test_bit(CONN_LOCAL_BUSY, &chan->conn_state))
|
|
goto drop;
|
|
|
|
if (tx_seq == chan->expected_tx_seq)
|
|
goto expected;
|
|
|
|
if (test_bit(CONN_SREJ_SENT, &chan->conn_state)) {
|
|
struct srej_list *first;
|
|
|
|
first = list_first_entry(&chan->srej_l,
|
|
struct srej_list, list);
|
|
if (tx_seq == first->tx_seq) {
|
|
l2cap_add_to_srej_queue(chan, skb, tx_seq, sar);
|
|
l2cap_check_srej_gap(chan, tx_seq);
|
|
|
|
list_del(&first->list);
|
|
kfree(first);
|
|
|
|
if (list_empty(&chan->srej_l)) {
|
|
chan->buffer_seq = chan->buffer_seq_srej;
|
|
clear_bit(CONN_SREJ_SENT, &chan->conn_state);
|
|
l2cap_send_ack(chan);
|
|
BT_DBG("chan %p, Exit SREJ_SENT", chan);
|
|
}
|
|
} else {
|
|
struct srej_list *l;
|
|
|
|
/* duplicated tx_seq */
|
|
if (l2cap_add_to_srej_queue(chan, skb, tx_seq, sar) < 0)
|
|
goto drop;
|
|
|
|
list_for_each_entry(l, &chan->srej_l, list) {
|
|
if (l->tx_seq == tx_seq) {
|
|
l2cap_resend_srejframe(chan, tx_seq);
|
|
return 0;
|
|
}
|
|
}
|
|
l2cap_send_srejframe(chan, tx_seq);
|
|
}
|
|
} else {
|
|
expected_tx_seq_offset =
|
|
(chan->expected_tx_seq - chan->buffer_seq) % 64;
|
|
if (expected_tx_seq_offset < 0)
|
|
expected_tx_seq_offset += 64;
|
|
|
|
/* duplicated tx_seq */
|
|
if (tx_seq_offset < expected_tx_seq_offset)
|
|
goto drop;
|
|
|
|
set_bit(CONN_SREJ_SENT, &chan->conn_state);
|
|
|
|
BT_DBG("chan %p, Enter SREJ", chan);
|
|
|
|
INIT_LIST_HEAD(&chan->srej_l);
|
|
chan->buffer_seq_srej = chan->buffer_seq;
|
|
|
|
__skb_queue_head_init(&chan->srej_q);
|
|
l2cap_add_to_srej_queue(chan, skb, tx_seq, sar);
|
|
|
|
set_bit(CONN_SEND_PBIT, &chan->conn_state);
|
|
|
|
l2cap_send_srejframe(chan, tx_seq);
|
|
|
|
__clear_ack_timer(chan);
|
|
}
|
|
return 0;
|
|
|
|
expected:
|
|
chan->expected_tx_seq = (chan->expected_tx_seq + 1) % 64;
|
|
|
|
if (test_bit(CONN_SREJ_SENT, &chan->conn_state)) {
|
|
bt_cb(skb)->tx_seq = tx_seq;
|
|
bt_cb(skb)->sar = sar;
|
|
__skb_queue_tail(&chan->srej_q, skb);
|
|
return 0;
|
|
}
|
|
|
|
err = l2cap_reassemble_sdu(chan, skb, rx_control);
|
|
chan->buffer_seq = (chan->buffer_seq + 1) % 64;
|
|
if (err < 0) {
|
|
l2cap_send_disconn_req(chan->conn, chan, ECONNRESET);
|
|
return err;
|
|
}
|
|
|
|
if (rx_control & L2CAP_CTRL_FINAL) {
|
|
if (!test_and_clear_bit(CONN_REJ_ACT, &chan->conn_state))
|
|
l2cap_retransmit_frames(chan);
|
|
}
|
|
|
|
__set_ack_timer(chan);
|
|
|
|
chan->num_acked = (chan->num_acked + 1) % num_to_ack;
|
|
if (chan->num_acked == num_to_ack - 1)
|
|
l2cap_send_ack(chan);
|
|
|
|
return 0;
|
|
|
|
drop:
|
|
kfree_skb(skb);
|
|
return 0;
|
|
}
|
|
|
|
static inline void l2cap_data_channel_rrframe(struct l2cap_chan *chan, u16 rx_control)
|
|
{
|
|
BT_DBG("chan %p, req_seq %d ctrl 0x%4.4x", chan, __get_reqseq(rx_control),
|
|
rx_control);
|
|
|
|
chan->expected_ack_seq = __get_reqseq(rx_control);
|
|
l2cap_drop_acked_frames(chan);
|
|
|
|
if (rx_control & L2CAP_CTRL_POLL) {
|
|
set_bit(CONN_SEND_FBIT, &chan->conn_state);
|
|
if (test_bit(CONN_SREJ_SENT, &chan->conn_state)) {
|
|
if (test_bit(CONN_REMOTE_BUSY, &chan->conn_state) &&
|
|
(chan->unacked_frames > 0))
|
|
__set_retrans_timer(chan);
|
|
|
|
clear_bit(CONN_REMOTE_BUSY, &chan->conn_state);
|
|
l2cap_send_srejtail(chan);
|
|
} else {
|
|
l2cap_send_i_or_rr_or_rnr(chan);
|
|
}
|
|
|
|
} else if (rx_control & L2CAP_CTRL_FINAL) {
|
|
clear_bit(CONN_REMOTE_BUSY, &chan->conn_state);
|
|
|
|
if (!test_and_clear_bit(CONN_REJ_ACT, &chan->conn_state))
|
|
l2cap_retransmit_frames(chan);
|
|
|
|
} else {
|
|
if (test_bit(CONN_REMOTE_BUSY, &chan->conn_state) &&
|
|
(chan->unacked_frames > 0))
|
|
__set_retrans_timer(chan);
|
|
|
|
clear_bit(CONN_REMOTE_BUSY, &chan->conn_state);
|
|
if (test_bit(CONN_SREJ_SENT, &chan->conn_state))
|
|
l2cap_send_ack(chan);
|
|
else
|
|
l2cap_ertm_send(chan);
|
|
}
|
|
}
|
|
|
|
static inline void l2cap_data_channel_rejframe(struct l2cap_chan *chan, u16 rx_control)
|
|
{
|
|
u8 tx_seq = __get_reqseq(rx_control);
|
|
|
|
BT_DBG("chan %p, req_seq %d ctrl 0x%4.4x", chan, tx_seq, rx_control);
|
|
|
|
clear_bit(CONN_REMOTE_BUSY, &chan->conn_state);
|
|
|
|
chan->expected_ack_seq = tx_seq;
|
|
l2cap_drop_acked_frames(chan);
|
|
|
|
if (rx_control & L2CAP_CTRL_FINAL) {
|
|
if (!test_and_clear_bit(CONN_REJ_ACT, &chan->conn_state))
|
|
l2cap_retransmit_frames(chan);
|
|
} else {
|
|
l2cap_retransmit_frames(chan);
|
|
|
|
if (test_bit(CONN_WAIT_F, &chan->conn_state))
|
|
set_bit(CONN_REJ_ACT, &chan->conn_state);
|
|
}
|
|
}
|
|
static inline void l2cap_data_channel_srejframe(struct l2cap_chan *chan, u16 rx_control)
|
|
{
|
|
u8 tx_seq = __get_reqseq(rx_control);
|
|
|
|
BT_DBG("chan %p, req_seq %d ctrl 0x%4.4x", chan, tx_seq, rx_control);
|
|
|
|
clear_bit(CONN_REMOTE_BUSY, &chan->conn_state);
|
|
|
|
if (rx_control & L2CAP_CTRL_POLL) {
|
|
chan->expected_ack_seq = tx_seq;
|
|
l2cap_drop_acked_frames(chan);
|
|
|
|
set_bit(CONN_SEND_FBIT, &chan->conn_state);
|
|
l2cap_retransmit_one_frame(chan, tx_seq);
|
|
|
|
l2cap_ertm_send(chan);
|
|
|
|
if (test_bit(CONN_WAIT_F, &chan->conn_state)) {
|
|
chan->srej_save_reqseq = tx_seq;
|
|
set_bit(CONN_SREJ_ACT, &chan->conn_state);
|
|
}
|
|
} else if (rx_control & L2CAP_CTRL_FINAL) {
|
|
if (test_bit(CONN_SREJ_ACT, &chan->conn_state) &&
|
|
chan->srej_save_reqseq == tx_seq)
|
|
clear_bit(CONN_SREJ_ACT, &chan->conn_state);
|
|
else
|
|
l2cap_retransmit_one_frame(chan, tx_seq);
|
|
} else {
|
|
l2cap_retransmit_one_frame(chan, tx_seq);
|
|
if (test_bit(CONN_WAIT_F, &chan->conn_state)) {
|
|
chan->srej_save_reqseq = tx_seq;
|
|
set_bit(CONN_SREJ_ACT, &chan->conn_state);
|
|
}
|
|
}
|
|
}
|
|
|
|
static inline void l2cap_data_channel_rnrframe(struct l2cap_chan *chan, u16 rx_control)
|
|
{
|
|
u8 tx_seq = __get_reqseq(rx_control);
|
|
|
|
BT_DBG("chan %p, req_seq %d ctrl 0x%4.4x", chan, tx_seq, rx_control);
|
|
|
|
set_bit(CONN_REMOTE_BUSY, &chan->conn_state);
|
|
chan->expected_ack_seq = tx_seq;
|
|
l2cap_drop_acked_frames(chan);
|
|
|
|
if (rx_control & L2CAP_CTRL_POLL)
|
|
set_bit(CONN_SEND_FBIT, &chan->conn_state);
|
|
|
|
if (!test_bit(CONN_SREJ_SENT, &chan->conn_state)) {
|
|
__clear_retrans_timer(chan);
|
|
if (rx_control & L2CAP_CTRL_POLL)
|
|
l2cap_send_rr_or_rnr(chan, L2CAP_CTRL_FINAL);
|
|
return;
|
|
}
|
|
|
|
if (rx_control & L2CAP_CTRL_POLL)
|
|
l2cap_send_srejtail(chan);
|
|
else
|
|
l2cap_send_sframe(chan, L2CAP_SUPER_RCV_READY);
|
|
}
|
|
|
|
static inline int l2cap_data_channel_sframe(struct l2cap_chan *chan, u16 rx_control, struct sk_buff *skb)
|
|
{
|
|
BT_DBG("chan %p rx_control 0x%4.4x len %d", chan, rx_control, skb->len);
|
|
|
|
if (L2CAP_CTRL_FINAL & rx_control &&
|
|
test_bit(CONN_WAIT_F, &chan->conn_state)) {
|
|
__clear_monitor_timer(chan);
|
|
if (chan->unacked_frames > 0)
|
|
__set_retrans_timer(chan);
|
|
clear_bit(CONN_WAIT_F, &chan->conn_state);
|
|
}
|
|
|
|
switch (rx_control & L2CAP_CTRL_SUPERVISE) {
|
|
case L2CAP_SUPER_RCV_READY:
|
|
l2cap_data_channel_rrframe(chan, rx_control);
|
|
break;
|
|
|
|
case L2CAP_SUPER_REJECT:
|
|
l2cap_data_channel_rejframe(chan, rx_control);
|
|
break;
|
|
|
|
case L2CAP_SUPER_SELECT_REJECT:
|
|
l2cap_data_channel_srejframe(chan, rx_control);
|
|
break;
|
|
|
|
case L2CAP_SUPER_RCV_NOT_READY:
|
|
l2cap_data_channel_rnrframe(chan, rx_control);
|
|
break;
|
|
}
|
|
|
|
kfree_skb(skb);
|
|
return 0;
|
|
}
|
|
|
|
static int l2cap_ertm_data_rcv(struct sock *sk, struct sk_buff *skb)
|
|
{
|
|
struct l2cap_chan *chan = l2cap_pi(sk)->chan;
|
|
u16 control;
|
|
u8 req_seq;
|
|
int len, next_tx_seq_offset, req_seq_offset;
|
|
|
|
control = get_unaligned_le16(skb->data);
|
|
skb_pull(skb, 2);
|
|
len = skb->len;
|
|
|
|
/*
|
|
* We can just drop the corrupted I-frame here.
|
|
* Receiver will miss it and start proper recovery
|
|
* procedures and ask retransmission.
|
|
*/
|
|
if (l2cap_check_fcs(chan, skb))
|
|
goto drop;
|
|
|
|
if (__is_sar_start(control) && __is_iframe(control))
|
|
len -= 2;
|
|
|
|
if (chan->fcs == L2CAP_FCS_CRC16)
|
|
len -= 2;
|
|
|
|
if (len > chan->mps) {
|
|
l2cap_send_disconn_req(chan->conn, chan, ECONNRESET);
|
|
goto drop;
|
|
}
|
|
|
|
req_seq = __get_reqseq(control);
|
|
req_seq_offset = (req_seq - chan->expected_ack_seq) % 64;
|
|
if (req_seq_offset < 0)
|
|
req_seq_offset += 64;
|
|
|
|
next_tx_seq_offset =
|
|
(chan->next_tx_seq - chan->expected_ack_seq) % 64;
|
|
if (next_tx_seq_offset < 0)
|
|
next_tx_seq_offset += 64;
|
|
|
|
/* check for invalid req-seq */
|
|
if (req_seq_offset > next_tx_seq_offset) {
|
|
l2cap_send_disconn_req(chan->conn, chan, ECONNRESET);
|
|
goto drop;
|
|
}
|
|
|
|
if (__is_iframe(control)) {
|
|
if (len < 0) {
|
|
l2cap_send_disconn_req(chan->conn, chan, ECONNRESET);
|
|
goto drop;
|
|
}
|
|
|
|
l2cap_data_channel_iframe(chan, control, skb);
|
|
} else {
|
|
if (len != 0) {
|
|
BT_ERR("%d", len);
|
|
l2cap_send_disconn_req(chan->conn, chan, ECONNRESET);
|
|
goto drop;
|
|
}
|
|
|
|
l2cap_data_channel_sframe(chan, control, skb);
|
|
}
|
|
|
|
return 0;
|
|
|
|
drop:
|
|
kfree_skb(skb);
|
|
return 0;
|
|
}
|
|
|
|
static inline int l2cap_data_channel(struct l2cap_conn *conn, u16 cid, struct sk_buff *skb)
|
|
{
|
|
struct l2cap_chan *chan;
|
|
struct sock *sk = NULL;
|
|
u16 control;
|
|
u8 tx_seq;
|
|
int len;
|
|
|
|
chan = l2cap_get_chan_by_scid(conn, cid);
|
|
if (!chan) {
|
|
BT_DBG("unknown cid 0x%4.4x", cid);
|
|
goto drop;
|
|
}
|
|
|
|
sk = chan->sk;
|
|
|
|
BT_DBG("chan %p, len %d", chan, skb->len);
|
|
|
|
if (chan->state != BT_CONNECTED)
|
|
goto drop;
|
|
|
|
switch (chan->mode) {
|
|
case L2CAP_MODE_BASIC:
|
|
/* If socket recv buffers overflows we drop data here
|
|
* which is *bad* because L2CAP has to be reliable.
|
|
* But we don't have any other choice. L2CAP doesn't
|
|
* provide flow control mechanism. */
|
|
|
|
if (chan->imtu < skb->len)
|
|
goto drop;
|
|
|
|
if (!chan->ops->recv(chan->data, skb))
|
|
goto done;
|
|
break;
|
|
|
|
case L2CAP_MODE_ERTM:
|
|
if (!sock_owned_by_user(sk)) {
|
|
l2cap_ertm_data_rcv(sk, skb);
|
|
} else {
|
|
if (sk_add_backlog(sk, skb))
|
|
goto drop;
|
|
}
|
|
|
|
goto done;
|
|
|
|
case L2CAP_MODE_STREAMING:
|
|
control = get_unaligned_le16(skb->data);
|
|
skb_pull(skb, 2);
|
|
len = skb->len;
|
|
|
|
if (l2cap_check_fcs(chan, skb))
|
|
goto drop;
|
|
|
|
if (__is_sar_start(control))
|
|
len -= 2;
|
|
|
|
if (chan->fcs == L2CAP_FCS_CRC16)
|
|
len -= 2;
|
|
|
|
if (len > chan->mps || len < 0 || __is_sframe(control))
|
|
goto drop;
|
|
|
|
tx_seq = __get_txseq(control);
|
|
|
|
if (chan->expected_tx_seq != tx_seq) {
|
|
/* Frame(s) missing - must discard partial SDU */
|
|
kfree_skb(chan->sdu);
|
|
chan->sdu = NULL;
|
|
chan->sdu_last_frag = NULL;
|
|
chan->sdu_len = 0;
|
|
|
|
/* TODO: Notify userland of missing data */
|
|
}
|
|
|
|
chan->expected_tx_seq = (tx_seq + 1) % 64;
|
|
|
|
if (l2cap_reassemble_sdu(chan, skb, control) == -EMSGSIZE)
|
|
l2cap_send_disconn_req(chan->conn, chan, ECONNRESET);
|
|
|
|
goto done;
|
|
|
|
default:
|
|
BT_DBG("chan %p: bad mode 0x%2.2x", chan, chan->mode);
|
|
break;
|
|
}
|
|
|
|
drop:
|
|
kfree_skb(skb);
|
|
|
|
done:
|
|
if (sk)
|
|
bh_unlock_sock(sk);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static inline int l2cap_conless_channel(struct l2cap_conn *conn, __le16 psm, struct sk_buff *skb)
|
|
{
|
|
struct sock *sk = NULL;
|
|
struct l2cap_chan *chan;
|
|
|
|
chan = l2cap_global_chan_by_psm(0, psm, conn->src);
|
|
if (!chan)
|
|
goto drop;
|
|
|
|
sk = chan->sk;
|
|
|
|
bh_lock_sock(sk);
|
|
|
|
BT_DBG("sk %p, len %d", sk, skb->len);
|
|
|
|
if (chan->state != BT_BOUND && chan->state != BT_CONNECTED)
|
|
goto drop;
|
|
|
|
if (chan->imtu < skb->len)
|
|
goto drop;
|
|
|
|
if (!chan->ops->recv(chan->data, skb))
|
|
goto done;
|
|
|
|
drop:
|
|
kfree_skb(skb);
|
|
|
|
done:
|
|
if (sk)
|
|
bh_unlock_sock(sk);
|
|
return 0;
|
|
}
|
|
|
|
static inline int l2cap_att_channel(struct l2cap_conn *conn, __le16 cid, struct sk_buff *skb)
|
|
{
|
|
struct sock *sk = NULL;
|
|
struct l2cap_chan *chan;
|
|
|
|
chan = l2cap_global_chan_by_scid(0, cid, conn->src);
|
|
if (!chan)
|
|
goto drop;
|
|
|
|
sk = chan->sk;
|
|
|
|
bh_lock_sock(sk);
|
|
|
|
BT_DBG("sk %p, len %d", sk, skb->len);
|
|
|
|
if (chan->state != BT_BOUND && chan->state != BT_CONNECTED)
|
|
goto drop;
|
|
|
|
if (chan->imtu < skb->len)
|
|
goto drop;
|
|
|
|
if (!chan->ops->recv(chan->data, skb))
|
|
goto done;
|
|
|
|
drop:
|
|
kfree_skb(skb);
|
|
|
|
done:
|
|
if (sk)
|
|
bh_unlock_sock(sk);
|
|
return 0;
|
|
}
|
|
|
|
static void l2cap_recv_frame(struct l2cap_conn *conn, struct sk_buff *skb)
|
|
{
|
|
struct l2cap_hdr *lh = (void *) skb->data;
|
|
u16 cid, len;
|
|
__le16 psm;
|
|
|
|
skb_pull(skb, L2CAP_HDR_SIZE);
|
|
cid = __le16_to_cpu(lh->cid);
|
|
len = __le16_to_cpu(lh->len);
|
|
|
|
if (len != skb->len) {
|
|
kfree_skb(skb);
|
|
return;
|
|
}
|
|
|
|
BT_DBG("len %d, cid 0x%4.4x", len, cid);
|
|
|
|
switch (cid) {
|
|
case L2CAP_CID_LE_SIGNALING:
|
|
case L2CAP_CID_SIGNALING:
|
|
l2cap_sig_channel(conn, skb);
|
|
break;
|
|
|
|
case L2CAP_CID_CONN_LESS:
|
|
psm = get_unaligned_le16(skb->data);
|
|
skb_pull(skb, 2);
|
|
l2cap_conless_channel(conn, psm, skb);
|
|
break;
|
|
|
|
case L2CAP_CID_LE_DATA:
|
|
l2cap_att_channel(conn, cid, skb);
|
|
break;
|
|
|
|
case L2CAP_CID_SMP:
|
|
if (smp_sig_channel(conn, skb))
|
|
l2cap_conn_del(conn->hcon, EACCES);
|
|
break;
|
|
|
|
default:
|
|
l2cap_data_channel(conn, cid, skb);
|
|
break;
|
|
}
|
|
}
|
|
|
|
/* ---- L2CAP interface with lower layer (HCI) ---- */
|
|
|
|
static int l2cap_connect_ind(struct hci_dev *hdev, bdaddr_t *bdaddr, u8 type)
|
|
{
|
|
int exact = 0, lm1 = 0, lm2 = 0;
|
|
struct l2cap_chan *c;
|
|
|
|
if (type != ACL_LINK)
|
|
return -EINVAL;
|
|
|
|
BT_DBG("hdev %s, bdaddr %s", hdev->name, batostr(bdaddr));
|
|
|
|
/* Find listening sockets and check their link_mode */
|
|
read_lock(&chan_list_lock);
|
|
list_for_each_entry(c, &chan_list, global_l) {
|
|
struct sock *sk = c->sk;
|
|
|
|
if (c->state != BT_LISTEN)
|
|
continue;
|
|
|
|
if (!bacmp(&bt_sk(sk)->src, &hdev->bdaddr)) {
|
|
lm1 |= HCI_LM_ACCEPT;
|
|
if (c->role_switch)
|
|
lm1 |= HCI_LM_MASTER;
|
|
exact++;
|
|
} else if (!bacmp(&bt_sk(sk)->src, BDADDR_ANY)) {
|
|
lm2 |= HCI_LM_ACCEPT;
|
|
if (c->role_switch)
|
|
lm2 |= HCI_LM_MASTER;
|
|
}
|
|
}
|
|
read_unlock(&chan_list_lock);
|
|
|
|
return exact ? lm1 : lm2;
|
|
}
|
|
|
|
static int l2cap_connect_cfm(struct hci_conn *hcon, u8 status)
|
|
{
|
|
struct l2cap_conn *conn;
|
|
|
|
BT_DBG("hcon %p bdaddr %s status %d", hcon, batostr(&hcon->dst), status);
|
|
|
|
if (!(hcon->type == ACL_LINK || hcon->type == LE_LINK))
|
|
return -EINVAL;
|
|
|
|
if (!status) {
|
|
conn = l2cap_conn_add(hcon, status);
|
|
if (conn)
|
|
l2cap_conn_ready(conn);
|
|
} else
|
|
l2cap_conn_del(hcon, bt_to_errno(status));
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int l2cap_disconn_ind(struct hci_conn *hcon)
|
|
{
|
|
struct l2cap_conn *conn = hcon->l2cap_data;
|
|
|
|
BT_DBG("hcon %p", hcon);
|
|
|
|
if ((hcon->type != ACL_LINK && hcon->type != LE_LINK) || !conn)
|
|
return 0x13;
|
|
|
|
return conn->disc_reason;
|
|
}
|
|
|
|
static int l2cap_disconn_cfm(struct hci_conn *hcon, u8 reason)
|
|
{
|
|
BT_DBG("hcon %p reason %d", hcon, reason);
|
|
|
|
if (!(hcon->type == ACL_LINK || hcon->type == LE_LINK))
|
|
return -EINVAL;
|
|
|
|
l2cap_conn_del(hcon, bt_to_errno(reason));
|
|
|
|
return 0;
|
|
}
|
|
|
|
static inline void l2cap_check_encryption(struct l2cap_chan *chan, u8 encrypt)
|
|
{
|
|
if (chan->chan_type != L2CAP_CHAN_CONN_ORIENTED)
|
|
return;
|
|
|
|
if (encrypt == 0x00) {
|
|
if (chan->sec_level == BT_SECURITY_MEDIUM) {
|
|
__clear_chan_timer(chan);
|
|
__set_chan_timer(chan, HZ * 5);
|
|
} else if (chan->sec_level == BT_SECURITY_HIGH)
|
|
l2cap_chan_close(chan, ECONNREFUSED);
|
|
} else {
|
|
if (chan->sec_level == BT_SECURITY_MEDIUM)
|
|
__clear_chan_timer(chan);
|
|
}
|
|
}
|
|
|
|
static int l2cap_security_cfm(struct hci_conn *hcon, u8 status, u8 encrypt)
|
|
{
|
|
struct l2cap_conn *conn = hcon->l2cap_data;
|
|
struct l2cap_chan *chan;
|
|
|
|
if (!conn)
|
|
return 0;
|
|
|
|
BT_DBG("conn %p", conn);
|
|
|
|
if (hcon->type == LE_LINK) {
|
|
smp_distribute_keys(conn, 0);
|
|
del_timer(&conn->security_timer);
|
|
}
|
|
|
|
read_lock(&conn->chan_lock);
|
|
|
|
list_for_each_entry(chan, &conn->chan_l, list) {
|
|
struct sock *sk = chan->sk;
|
|
|
|
bh_lock_sock(sk);
|
|
|
|
BT_DBG("chan->scid %d", chan->scid);
|
|
|
|
if (chan->scid == L2CAP_CID_LE_DATA) {
|
|
if (!status && encrypt) {
|
|
chan->sec_level = hcon->sec_level;
|
|
l2cap_chan_ready(sk);
|
|
}
|
|
|
|
bh_unlock_sock(sk);
|
|
continue;
|
|
}
|
|
|
|
if (test_bit(CONF_CONNECT_PEND, &chan->conf_state)) {
|
|
bh_unlock_sock(sk);
|
|
continue;
|
|
}
|
|
|
|
if (!status && (chan->state == BT_CONNECTED ||
|
|
chan->state == BT_CONFIG)) {
|
|
l2cap_check_encryption(chan, encrypt);
|
|
bh_unlock_sock(sk);
|
|
continue;
|
|
}
|
|
|
|
if (chan->state == BT_CONNECT) {
|
|
if (!status) {
|
|
struct l2cap_conn_req req;
|
|
req.scid = cpu_to_le16(chan->scid);
|
|
req.psm = chan->psm;
|
|
|
|
chan->ident = l2cap_get_ident(conn);
|
|
set_bit(CONF_CONNECT_PEND, &chan->conf_state);
|
|
|
|
l2cap_send_cmd(conn, chan->ident,
|
|
L2CAP_CONN_REQ, sizeof(req), &req);
|
|
} else {
|
|
__clear_chan_timer(chan);
|
|
__set_chan_timer(chan, HZ / 10);
|
|
}
|
|
} else if (chan->state == BT_CONNECT2) {
|
|
struct l2cap_conn_rsp rsp;
|
|
__u16 res, stat;
|
|
|
|
if (!status) {
|
|
if (bt_sk(sk)->defer_setup) {
|
|
struct sock *parent = bt_sk(sk)->parent;
|
|
res = L2CAP_CR_PEND;
|
|
stat = L2CAP_CS_AUTHOR_PEND;
|
|
if (parent)
|
|
parent->sk_data_ready(parent, 0);
|
|
} else {
|
|
l2cap_state_change(chan, BT_CONFIG);
|
|
res = L2CAP_CR_SUCCESS;
|
|
stat = L2CAP_CS_NO_INFO;
|
|
}
|
|
} else {
|
|
l2cap_state_change(chan, BT_DISCONN);
|
|
__set_chan_timer(chan, HZ / 10);
|
|
res = L2CAP_CR_SEC_BLOCK;
|
|
stat = L2CAP_CS_NO_INFO;
|
|
}
|
|
|
|
rsp.scid = cpu_to_le16(chan->dcid);
|
|
rsp.dcid = cpu_to_le16(chan->scid);
|
|
rsp.result = cpu_to_le16(res);
|
|
rsp.status = cpu_to_le16(stat);
|
|
l2cap_send_cmd(conn, chan->ident, L2CAP_CONN_RSP,
|
|
sizeof(rsp), &rsp);
|
|
}
|
|
|
|
bh_unlock_sock(sk);
|
|
}
|
|
|
|
read_unlock(&conn->chan_lock);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int l2cap_recv_acldata(struct hci_conn *hcon, struct sk_buff *skb, u16 flags)
|
|
{
|
|
struct l2cap_conn *conn = hcon->l2cap_data;
|
|
|
|
if (!conn)
|
|
conn = l2cap_conn_add(hcon, 0);
|
|
|
|
if (!conn)
|
|
goto drop;
|
|
|
|
BT_DBG("conn %p len %d flags 0x%x", conn, skb->len, flags);
|
|
|
|
if (!(flags & ACL_CONT)) {
|
|
struct l2cap_hdr *hdr;
|
|
struct l2cap_chan *chan;
|
|
u16 cid;
|
|
int len;
|
|
|
|
if (conn->rx_len) {
|
|
BT_ERR("Unexpected start frame (len %d)", skb->len);
|
|
kfree_skb(conn->rx_skb);
|
|
conn->rx_skb = NULL;
|
|
conn->rx_len = 0;
|
|
l2cap_conn_unreliable(conn, ECOMM);
|
|
}
|
|
|
|
/* Start fragment always begin with Basic L2CAP header */
|
|
if (skb->len < L2CAP_HDR_SIZE) {
|
|
BT_ERR("Frame is too short (len %d)", skb->len);
|
|
l2cap_conn_unreliable(conn, ECOMM);
|
|
goto drop;
|
|
}
|
|
|
|
hdr = (struct l2cap_hdr *) skb->data;
|
|
len = __le16_to_cpu(hdr->len) + L2CAP_HDR_SIZE;
|
|
cid = __le16_to_cpu(hdr->cid);
|
|
|
|
if (len == skb->len) {
|
|
/* Complete frame received */
|
|
l2cap_recv_frame(conn, skb);
|
|
return 0;
|
|
}
|
|
|
|
BT_DBG("Start: total len %d, frag len %d", len, skb->len);
|
|
|
|
if (skb->len > len) {
|
|
BT_ERR("Frame is too long (len %d, expected len %d)",
|
|
skb->len, len);
|
|
l2cap_conn_unreliable(conn, ECOMM);
|
|
goto drop;
|
|
}
|
|
|
|
chan = l2cap_get_chan_by_scid(conn, cid);
|
|
|
|
if (chan && chan->sk) {
|
|
struct sock *sk = chan->sk;
|
|
|
|
if (chan->imtu < len - L2CAP_HDR_SIZE) {
|
|
BT_ERR("Frame exceeding recv MTU (len %d, "
|
|
"MTU %d)", len,
|
|
chan->imtu);
|
|
bh_unlock_sock(sk);
|
|
l2cap_conn_unreliable(conn, ECOMM);
|
|
goto drop;
|
|
}
|
|
bh_unlock_sock(sk);
|
|
}
|
|
|
|
/* Allocate skb for the complete frame (with header) */
|
|
conn->rx_skb = bt_skb_alloc(len, GFP_ATOMIC);
|
|
if (!conn->rx_skb)
|
|
goto drop;
|
|
|
|
skb_copy_from_linear_data(skb, skb_put(conn->rx_skb, skb->len),
|
|
skb->len);
|
|
conn->rx_len = len - skb->len;
|
|
} else {
|
|
BT_DBG("Cont: frag len %d (expecting %d)", skb->len, conn->rx_len);
|
|
|
|
if (!conn->rx_len) {
|
|
BT_ERR("Unexpected continuation frame (len %d)", skb->len);
|
|
l2cap_conn_unreliable(conn, ECOMM);
|
|
goto drop;
|
|
}
|
|
|
|
if (skb->len > conn->rx_len) {
|
|
BT_ERR("Fragment is too long (len %d, expected %d)",
|
|
skb->len, conn->rx_len);
|
|
kfree_skb(conn->rx_skb);
|
|
conn->rx_skb = NULL;
|
|
conn->rx_len = 0;
|
|
l2cap_conn_unreliable(conn, ECOMM);
|
|
goto drop;
|
|
}
|
|
|
|
skb_copy_from_linear_data(skb, skb_put(conn->rx_skb, skb->len),
|
|
skb->len);
|
|
conn->rx_len -= skb->len;
|
|
|
|
if (!conn->rx_len) {
|
|
/* Complete frame received */
|
|
l2cap_recv_frame(conn, conn->rx_skb);
|
|
conn->rx_skb = NULL;
|
|
}
|
|
}
|
|
|
|
drop:
|
|
kfree_skb(skb);
|
|
return 0;
|
|
}
|
|
|
|
static int l2cap_debugfs_show(struct seq_file *f, void *p)
|
|
{
|
|
struct l2cap_chan *c;
|
|
|
|
read_lock_bh(&chan_list_lock);
|
|
|
|
list_for_each_entry(c, &chan_list, global_l) {
|
|
struct sock *sk = c->sk;
|
|
|
|
seq_printf(f, "%s %s %d %d 0x%4.4x 0x%4.4x %d %d %d %d\n",
|
|
batostr(&bt_sk(sk)->src),
|
|
batostr(&bt_sk(sk)->dst),
|
|
c->state, __le16_to_cpu(c->psm),
|
|
c->scid, c->dcid, c->imtu, c->omtu,
|
|
c->sec_level, c->mode);
|
|
}
|
|
|
|
read_unlock_bh(&chan_list_lock);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int l2cap_debugfs_open(struct inode *inode, struct file *file)
|
|
{
|
|
return single_open(file, l2cap_debugfs_show, inode->i_private);
|
|
}
|
|
|
|
static const struct file_operations l2cap_debugfs_fops = {
|
|
.open = l2cap_debugfs_open,
|
|
.read = seq_read,
|
|
.llseek = seq_lseek,
|
|
.release = single_release,
|
|
};
|
|
|
|
static struct dentry *l2cap_debugfs;
|
|
|
|
static struct hci_proto l2cap_hci_proto = {
|
|
.name = "L2CAP",
|
|
.id = HCI_PROTO_L2CAP,
|
|
.connect_ind = l2cap_connect_ind,
|
|
.connect_cfm = l2cap_connect_cfm,
|
|
.disconn_ind = l2cap_disconn_ind,
|
|
.disconn_cfm = l2cap_disconn_cfm,
|
|
.security_cfm = l2cap_security_cfm,
|
|
.recv_acldata = l2cap_recv_acldata
|
|
};
|
|
|
|
int __init l2cap_init(void)
|
|
{
|
|
int err;
|
|
|
|
err = l2cap_init_sockets();
|
|
if (err < 0)
|
|
return err;
|
|
|
|
err = hci_register_proto(&l2cap_hci_proto);
|
|
if (err < 0) {
|
|
BT_ERR("L2CAP protocol registration failed");
|
|
bt_sock_unregister(BTPROTO_L2CAP);
|
|
goto error;
|
|
}
|
|
|
|
if (bt_debugfs) {
|
|
l2cap_debugfs = debugfs_create_file("l2cap", 0444,
|
|
bt_debugfs, NULL, &l2cap_debugfs_fops);
|
|
if (!l2cap_debugfs)
|
|
BT_ERR("Failed to create L2CAP debug file");
|
|
}
|
|
|
|
return 0;
|
|
|
|
error:
|
|
l2cap_cleanup_sockets();
|
|
return err;
|
|
}
|
|
|
|
void l2cap_exit(void)
|
|
{
|
|
debugfs_remove(l2cap_debugfs);
|
|
|
|
if (hci_unregister_proto(&l2cap_hci_proto) < 0)
|
|
BT_ERR("L2CAP protocol unregistration failed");
|
|
|
|
l2cap_cleanup_sockets();
|
|
}
|
|
|
|
module_param(disable_ertm, bool, 0644);
|
|
MODULE_PARM_DESC(disable_ertm, "Disable enhanced retransmission mode");
|