889a3ca466
SrejActioned is a flag that when set prevents local side to retransmit a I-frame(the data frame) already retransmitted. The local entity can retransmit again only when it receives a SREJ frame with the F-bit set. SREJ frame - Selective Reject frame - is sent when an entity wants the retransmission of a specific I-frame that was lost or corrupted. This bug can put ERTM in an unknown state once the entity can't retransmit. A frame with the Final bit set is expected when the local side sends a frame with the Poll bit set due to a local busy condition or a retransmission timer expired. (Receipt of P-bit shall always be replied by a frame with the F-bit set). pi->conn_state keeps informations about many ERTM flags including SrejActioned. Signed-off-by: Gustavo F. Padovan <gustavo@las.ic.unicamp.br> Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
4029 lines
89 KiB
C
4029 lines
89 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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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 and sockets. */
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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/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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#define VERSION "2.14"
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static int enable_ertm = 0;
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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 const struct proto_ops l2cap_sock_ops;
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static struct bt_sock_list l2cap_sk_list = {
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.lock = __RW_LOCK_UNLOCKED(l2cap_sk_list.lock)
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};
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static void __l2cap_sock_close(struct sock *sk, int reason);
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static void l2cap_sock_close(struct sock *sk);
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static void l2cap_sock_kill(struct sock *sk);
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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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/* ---- L2CAP timers ---- */
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static void l2cap_sock_timeout(unsigned long arg)
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{
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struct sock *sk = (struct sock *) arg;
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int reason;
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BT_DBG("sock %p state %d", sk, sk->sk_state);
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bh_lock_sock(sk);
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if (sk->sk_state == BT_CONNECTED || sk->sk_state == BT_CONFIG)
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reason = ECONNREFUSED;
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else if (sk->sk_state == BT_CONNECT &&
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l2cap_pi(sk)->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_sock_close(sk, reason);
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bh_unlock_sock(sk);
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l2cap_sock_kill(sk);
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sock_put(sk);
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}
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static void l2cap_sock_set_timer(struct sock *sk, long timeout)
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{
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BT_DBG("sk %p state %d timeout %ld", sk, sk->sk_state, timeout);
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sk_reset_timer(sk, &sk->sk_timer, jiffies + timeout);
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}
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static void l2cap_sock_clear_timer(struct sock *sk)
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{
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BT_DBG("sock %p state %d", sk, sk->sk_state);
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sk_stop_timer(sk, &sk->sk_timer);
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}
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/* ---- L2CAP channels ---- */
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static struct sock *__l2cap_get_chan_by_dcid(struct l2cap_chan_list *l, u16 cid)
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{
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struct sock *s;
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for (s = l->head; s; s = l2cap_pi(s)->next_c) {
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if (l2cap_pi(s)->dcid == cid)
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break;
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}
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return s;
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}
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static struct sock *__l2cap_get_chan_by_scid(struct l2cap_chan_list *l, u16 cid)
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{
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struct sock *s;
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for (s = l->head; s; s = l2cap_pi(s)->next_c) {
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if (l2cap_pi(s)->scid == cid)
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break;
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}
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return s;
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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 inline struct sock *l2cap_get_chan_by_scid(struct l2cap_chan_list *l, u16 cid)
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{
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struct sock *s;
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read_lock(&l->lock);
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s = __l2cap_get_chan_by_scid(l, cid);
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if (s)
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bh_lock_sock(s);
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read_unlock(&l->lock);
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return s;
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}
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static struct sock *__l2cap_get_chan_by_ident(struct l2cap_chan_list *l, u8 ident)
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{
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struct sock *s;
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for (s = l->head; s; s = l2cap_pi(s)->next_c) {
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if (l2cap_pi(s)->ident == ident)
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break;
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}
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return s;
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}
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static inline struct sock *l2cap_get_chan_by_ident(struct l2cap_chan_list *l, u8 ident)
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{
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struct sock *s;
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read_lock(&l->lock);
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s = __l2cap_get_chan_by_ident(l, ident);
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if (s)
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bh_lock_sock(s);
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read_unlock(&l->lock);
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return s;
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}
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static u16 l2cap_alloc_cid(struct l2cap_chan_list *l)
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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(l, 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 inline void __l2cap_chan_link(struct l2cap_chan_list *l, struct sock *sk)
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{
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sock_hold(sk);
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if (l->head)
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l2cap_pi(l->head)->prev_c = sk;
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l2cap_pi(sk)->next_c = l->head;
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l2cap_pi(sk)->prev_c = NULL;
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l->head = sk;
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}
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static inline void l2cap_chan_unlink(struct l2cap_chan_list *l, struct sock *sk)
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{
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struct sock *next = l2cap_pi(sk)->next_c, *prev = l2cap_pi(sk)->prev_c;
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write_lock_bh(&l->lock);
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if (sk == l->head)
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l->head = next;
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if (next)
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l2cap_pi(next)->prev_c = prev;
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if (prev)
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l2cap_pi(prev)->next_c = next;
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write_unlock_bh(&l->lock);
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__sock_put(sk);
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}
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static void __l2cap_chan_add(struct l2cap_conn *conn, struct sock *sk, struct sock *parent)
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{
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struct l2cap_chan_list *l = &conn->chan_list;
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BT_DBG("conn %p, psm 0x%2.2x, dcid 0x%4.4x", conn,
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l2cap_pi(sk)->psm, l2cap_pi(sk)->dcid);
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conn->disc_reason = 0x13;
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l2cap_pi(sk)->conn = conn;
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if (sk->sk_type == SOCK_SEQPACKET) {
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/* Alloc CID for connection-oriented socket */
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l2cap_pi(sk)->scid = l2cap_alloc_cid(l);
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} else if (sk->sk_type == SOCK_DGRAM) {
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/* Connectionless socket */
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l2cap_pi(sk)->scid = L2CAP_CID_CONN_LESS;
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l2cap_pi(sk)->dcid = L2CAP_CID_CONN_LESS;
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l2cap_pi(sk)->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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l2cap_pi(sk)->scid = L2CAP_CID_SIGNALING;
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l2cap_pi(sk)->dcid = L2CAP_CID_SIGNALING;
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l2cap_pi(sk)->omtu = L2CAP_DEFAULT_MTU;
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}
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__l2cap_chan_link(l, sk);
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if (parent)
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bt_accept_enqueue(parent, sk);
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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 sock *sk, int err)
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{
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struct l2cap_conn *conn = l2cap_pi(sk)->conn;
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struct sock *parent = bt_sk(sk)->parent;
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l2cap_sock_clear_timer(sk);
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BT_DBG("sk %p, conn %p, err %d", sk, conn, err);
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if (conn) {
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/* Unlink from channel list */
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l2cap_chan_unlink(&conn->chan_list, sk);
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l2cap_pi(sk)->conn = NULL;
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hci_conn_put(conn->hcon);
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}
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sk->sk_state = 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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}
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/* Service level security */
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static inline int l2cap_check_security(struct sock *sk)
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{
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struct l2cap_conn *conn = l2cap_pi(sk)->conn;
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__u8 auth_type;
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if (l2cap_pi(sk)->psm == cpu_to_le16(0x0001)) {
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if (l2cap_pi(sk)->sec_level == BT_SECURITY_HIGH)
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auth_type = HCI_AT_NO_BONDING_MITM;
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else
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auth_type = HCI_AT_NO_BONDING;
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if (l2cap_pi(sk)->sec_level == BT_SECURITY_LOW)
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l2cap_pi(sk)->sec_level = BT_SECURITY_SDP;
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} else {
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switch (l2cap_pi(sk)->sec_level) {
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case BT_SECURITY_HIGH:
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auth_type = HCI_AT_GENERAL_BONDING_MITM;
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break;
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case BT_SECURITY_MEDIUM:
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auth_type = HCI_AT_GENERAL_BONDING;
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break;
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default:
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auth_type = HCI_AT_NO_BONDING;
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break;
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}
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}
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return hci_conn_security(conn->hcon, l2cap_pi(sk)->sec_level,
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auth_type);
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}
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static inline u8 l2cap_get_ident(struct l2cap_conn *conn)
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{
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u8 id;
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/* Get next available identificator.
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* 1 - 128 are used by kernel.
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* 129 - 199 are reserved.
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* 200 - 254 are used by utilities like l2ping, etc.
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*/
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spin_lock_bh(&conn->lock);
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if (++conn->tx_ident > 128)
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conn->tx_ident = 1;
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id = conn->tx_ident;
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spin_unlock_bh(&conn->lock);
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return id;
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}
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static inline int l2cap_send_cmd(struct l2cap_conn *conn, u8 ident, u8 code, u16 len, void *data)
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{
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struct sk_buff *skb = l2cap_build_cmd(conn, code, ident, len, data);
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BT_DBG("code 0x%2.2x", code);
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if (!skb)
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return -ENOMEM;
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return hci_send_acl(conn->hcon, skb, 0);
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}
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static inline int l2cap_send_sframe(struct l2cap_pinfo *pi, u16 control)
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{
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struct sk_buff *skb;
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struct l2cap_hdr *lh;
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struct l2cap_conn *conn = pi->conn;
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int count, hlen = L2CAP_HDR_SIZE + 2;
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if (pi->fcs == L2CAP_FCS_CRC16)
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hlen += 2;
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BT_DBG("pi %p, control 0x%2.2x", pi, control);
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count = min_t(unsigned int, conn->mtu, hlen);
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control |= L2CAP_CTRL_FRAME_TYPE;
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skb = bt_skb_alloc(count, GFP_ATOMIC);
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if (!skb)
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return -ENOMEM;
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lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE);
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lh->len = cpu_to_le16(hlen - L2CAP_HDR_SIZE);
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lh->cid = cpu_to_le16(pi->dcid);
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put_unaligned_le16(control, skb_put(skb, 2));
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if (pi->fcs == L2CAP_FCS_CRC16) {
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u16 fcs = crc16(0, (u8 *)lh, count - 2);
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put_unaligned_le16(fcs, skb_put(skb, 2));
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}
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return hci_send_acl(pi->conn->hcon, skb, 0);
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}
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static inline int l2cap_send_rr_or_rnr(struct l2cap_pinfo *pi, u16 control)
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{
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if (pi->conn_state & L2CAP_CONN_LOCAL_BUSY)
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control |= L2CAP_SUPER_RCV_NOT_READY;
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else
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control |= L2CAP_SUPER_RCV_READY;
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return l2cap_send_sframe(pi, control);
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}
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|
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static void l2cap_do_start(struct sock *sk)
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{
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struct l2cap_conn *conn = l2cap_pi(sk)->conn;
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|
|
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if (conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_SENT) {
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if (!(conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_DONE))
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return;
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|
|
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if (l2cap_check_security(sk)) {
|
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struct l2cap_conn_req req;
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req.scid = cpu_to_le16(l2cap_pi(sk)->scid);
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req.psm = l2cap_pi(sk)->psm;
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l2cap_pi(sk)->ident = l2cap_get_ident(conn);
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|
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l2cap_send_cmd(conn, l2cap_pi(sk)->ident,
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L2CAP_CONN_REQ, sizeof(req), &req);
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}
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} else {
|
|
struct l2cap_info_req req;
|
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req.type = cpu_to_le16(L2CAP_IT_FEAT_MASK);
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|
|
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conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_SENT;
|
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conn->info_ident = l2cap_get_ident(conn);
|
|
|
|
mod_timer(&conn->info_timer, jiffies +
|
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msecs_to_jiffies(L2CAP_INFO_TIMEOUT));
|
|
|
|
l2cap_send_cmd(conn, conn->info_ident,
|
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L2CAP_INFO_REQ, sizeof(req), &req);
|
|
}
|
|
}
|
|
|
|
static void l2cap_send_disconn_req(struct l2cap_conn *conn, struct sock *sk)
|
|
{
|
|
struct l2cap_disconn_req req;
|
|
|
|
req.dcid = cpu_to_le16(l2cap_pi(sk)->dcid);
|
|
req.scid = cpu_to_le16(l2cap_pi(sk)->scid);
|
|
l2cap_send_cmd(conn, l2cap_get_ident(conn),
|
|
L2CAP_DISCONN_REQ, sizeof(req), &req);
|
|
}
|
|
|
|
/* ---- L2CAP connections ---- */
|
|
static void l2cap_conn_start(struct l2cap_conn *conn)
|
|
{
|
|
struct l2cap_chan_list *l = &conn->chan_list;
|
|
struct sock *sk;
|
|
|
|
BT_DBG("conn %p", conn);
|
|
|
|
read_lock(&l->lock);
|
|
|
|
for (sk = l->head; sk; sk = l2cap_pi(sk)->next_c) {
|
|
bh_lock_sock(sk);
|
|
|
|
if (sk->sk_type != SOCK_SEQPACKET) {
|
|
bh_unlock_sock(sk);
|
|
continue;
|
|
}
|
|
|
|
if (sk->sk_state == BT_CONNECT) {
|
|
if (l2cap_check_security(sk)) {
|
|
struct l2cap_conn_req req;
|
|
req.scid = cpu_to_le16(l2cap_pi(sk)->scid);
|
|
req.psm = l2cap_pi(sk)->psm;
|
|
|
|
l2cap_pi(sk)->ident = l2cap_get_ident(conn);
|
|
|
|
l2cap_send_cmd(conn, l2cap_pi(sk)->ident,
|
|
L2CAP_CONN_REQ, sizeof(req), &req);
|
|
}
|
|
} else if (sk->sk_state == BT_CONNECT2) {
|
|
struct l2cap_conn_rsp rsp;
|
|
rsp.scid = cpu_to_le16(l2cap_pi(sk)->dcid);
|
|
rsp.dcid = cpu_to_le16(l2cap_pi(sk)->scid);
|
|
|
|
if (l2cap_check_security(sk)) {
|
|
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);
|
|
parent->sk_data_ready(parent, 0);
|
|
|
|
} else {
|
|
sk->sk_state = 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, l2cap_pi(sk)->ident,
|
|
L2CAP_CONN_RSP, sizeof(rsp), &rsp);
|
|
}
|
|
|
|
bh_unlock_sock(sk);
|
|
}
|
|
|
|
read_unlock(&l->lock);
|
|
}
|
|
|
|
static void l2cap_conn_ready(struct l2cap_conn *conn)
|
|
{
|
|
struct l2cap_chan_list *l = &conn->chan_list;
|
|
struct sock *sk;
|
|
|
|
BT_DBG("conn %p", conn);
|
|
|
|
read_lock(&l->lock);
|
|
|
|
for (sk = l->head; sk; sk = l2cap_pi(sk)->next_c) {
|
|
bh_lock_sock(sk);
|
|
|
|
if (sk->sk_type != SOCK_SEQPACKET) {
|
|
l2cap_sock_clear_timer(sk);
|
|
sk->sk_state = BT_CONNECTED;
|
|
sk->sk_state_change(sk);
|
|
} else if (sk->sk_state == BT_CONNECT)
|
|
l2cap_do_start(sk);
|
|
|
|
bh_unlock_sock(sk);
|
|
}
|
|
|
|
read_unlock(&l->lock);
|
|
}
|
|
|
|
/* Notify sockets that we cannot guaranty reliability anymore */
|
|
static void l2cap_conn_unreliable(struct l2cap_conn *conn, int err)
|
|
{
|
|
struct l2cap_chan_list *l = &conn->chan_list;
|
|
struct sock *sk;
|
|
|
|
BT_DBG("conn %p", conn);
|
|
|
|
read_lock(&l->lock);
|
|
|
|
for (sk = l->head; sk; sk = l2cap_pi(sk)->next_c) {
|
|
if (l2cap_pi(sk)->force_reliable)
|
|
sk->sk_err = err;
|
|
}
|
|
|
|
read_unlock(&l->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 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);
|
|
|
|
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_list.lock);
|
|
|
|
setup_timer(&conn->info_timer, l2cap_info_timeout,
|
|
(unsigned long) conn);
|
|
|
|
conn->disc_reason = 0x13;
|
|
|
|
return conn;
|
|
}
|
|
|
|
static void l2cap_conn_del(struct hci_conn *hcon, int err)
|
|
{
|
|
struct l2cap_conn *conn = hcon->l2cap_data;
|
|
struct sock *sk;
|
|
|
|
if (!conn)
|
|
return;
|
|
|
|
BT_DBG("hcon %p conn %p, err %d", hcon, conn, err);
|
|
|
|
kfree_skb(conn->rx_skb);
|
|
|
|
/* Kill channels */
|
|
while ((sk = conn->chan_list.head)) {
|
|
bh_lock_sock(sk);
|
|
l2cap_chan_del(sk, err);
|
|
bh_unlock_sock(sk);
|
|
l2cap_sock_kill(sk);
|
|
}
|
|
|
|
if (conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_SENT)
|
|
del_timer_sync(&conn->info_timer);
|
|
|
|
hcon->l2cap_data = NULL;
|
|
kfree(conn);
|
|
}
|
|
|
|
static inline void l2cap_chan_add(struct l2cap_conn *conn, struct sock *sk, struct sock *parent)
|
|
{
|
|
struct l2cap_chan_list *l = &conn->chan_list;
|
|
write_lock_bh(&l->lock);
|
|
__l2cap_chan_add(conn, sk, parent);
|
|
write_unlock_bh(&l->lock);
|
|
}
|
|
|
|
/* ---- Socket interface ---- */
|
|
static struct sock *__l2cap_get_sock_by_addr(__le16 psm, bdaddr_t *src)
|
|
{
|
|
struct sock *sk;
|
|
struct hlist_node *node;
|
|
sk_for_each(sk, node, &l2cap_sk_list.head)
|
|
if (l2cap_pi(sk)->sport == psm && !bacmp(&bt_sk(sk)->src, src))
|
|
goto found;
|
|
sk = NULL;
|
|
found:
|
|
return sk;
|
|
}
|
|
|
|
/* Find socket with psm and source bdaddr.
|
|
* Returns closest match.
|
|
*/
|
|
static struct sock *__l2cap_get_sock_by_psm(int state, __le16 psm, bdaddr_t *src)
|
|
{
|
|
struct sock *sk = NULL, *sk1 = NULL;
|
|
struct hlist_node *node;
|
|
|
|
sk_for_each(sk, node, &l2cap_sk_list.head) {
|
|
if (state && sk->sk_state != state)
|
|
continue;
|
|
|
|
if (l2cap_pi(sk)->psm == psm) {
|
|
/* Exact match. */
|
|
if (!bacmp(&bt_sk(sk)->src, src))
|
|
break;
|
|
|
|
/* Closest match */
|
|
if (!bacmp(&bt_sk(sk)->src, BDADDR_ANY))
|
|
sk1 = sk;
|
|
}
|
|
}
|
|
return node ? sk : sk1;
|
|
}
|
|
|
|
/* Find socket with given address (psm, src).
|
|
* Returns locked socket */
|
|
static inline struct sock *l2cap_get_sock_by_psm(int state, __le16 psm, bdaddr_t *src)
|
|
{
|
|
struct sock *s;
|
|
read_lock(&l2cap_sk_list.lock);
|
|
s = __l2cap_get_sock_by_psm(state, psm, src);
|
|
if (s)
|
|
bh_lock_sock(s);
|
|
read_unlock(&l2cap_sk_list.lock);
|
|
return s;
|
|
}
|
|
|
|
static void l2cap_sock_destruct(struct sock *sk)
|
|
{
|
|
BT_DBG("sk %p", sk);
|
|
|
|
skb_queue_purge(&sk->sk_receive_queue);
|
|
skb_queue_purge(&sk->sk_write_queue);
|
|
}
|
|
|
|
static void l2cap_sock_cleanup_listen(struct sock *parent)
|
|
{
|
|
struct sock *sk;
|
|
|
|
BT_DBG("parent %p", parent);
|
|
|
|
/* Close not yet accepted channels */
|
|
while ((sk = bt_accept_dequeue(parent, NULL)))
|
|
l2cap_sock_close(sk);
|
|
|
|
parent->sk_state = BT_CLOSED;
|
|
sock_set_flag(parent, SOCK_ZAPPED);
|
|
}
|
|
|
|
/* Kill socket (only if zapped and orphan)
|
|
* Must be called on unlocked socket.
|
|
*/
|
|
static void l2cap_sock_kill(struct sock *sk)
|
|
{
|
|
if (!sock_flag(sk, SOCK_ZAPPED) || sk->sk_socket)
|
|
return;
|
|
|
|
BT_DBG("sk %p state %d", sk, sk->sk_state);
|
|
|
|
/* Kill poor orphan */
|
|
bt_sock_unlink(&l2cap_sk_list, sk);
|
|
sock_set_flag(sk, SOCK_DEAD);
|
|
sock_put(sk);
|
|
}
|
|
|
|
static void __l2cap_sock_close(struct sock *sk, int reason)
|
|
{
|
|
BT_DBG("sk %p state %d socket %p", sk, sk->sk_state, sk->sk_socket);
|
|
|
|
switch (sk->sk_state) {
|
|
case BT_LISTEN:
|
|
l2cap_sock_cleanup_listen(sk);
|
|
break;
|
|
|
|
case BT_CONNECTED:
|
|
case BT_CONFIG:
|
|
if (sk->sk_type == SOCK_SEQPACKET) {
|
|
struct l2cap_conn *conn = l2cap_pi(sk)->conn;
|
|
|
|
sk->sk_state = BT_DISCONN;
|
|
l2cap_sock_set_timer(sk, sk->sk_sndtimeo);
|
|
l2cap_send_disconn_req(conn, sk);
|
|
} else
|
|
l2cap_chan_del(sk, reason);
|
|
break;
|
|
|
|
case BT_CONNECT2:
|
|
if (sk->sk_type == SOCK_SEQPACKET) {
|
|
struct l2cap_conn *conn = l2cap_pi(sk)->conn;
|
|
struct l2cap_conn_rsp rsp;
|
|
__u16 result;
|
|
|
|
if (bt_sk(sk)->defer_setup)
|
|
result = L2CAP_CR_SEC_BLOCK;
|
|
else
|
|
result = L2CAP_CR_BAD_PSM;
|
|
|
|
rsp.scid = cpu_to_le16(l2cap_pi(sk)->dcid);
|
|
rsp.dcid = cpu_to_le16(l2cap_pi(sk)->scid);
|
|
rsp.result = cpu_to_le16(result);
|
|
rsp.status = cpu_to_le16(L2CAP_CS_NO_INFO);
|
|
l2cap_send_cmd(conn, l2cap_pi(sk)->ident,
|
|
L2CAP_CONN_RSP, sizeof(rsp), &rsp);
|
|
} else
|
|
l2cap_chan_del(sk, reason);
|
|
break;
|
|
|
|
case BT_CONNECT:
|
|
case BT_DISCONN:
|
|
l2cap_chan_del(sk, reason);
|
|
break;
|
|
|
|
default:
|
|
sock_set_flag(sk, SOCK_ZAPPED);
|
|
break;
|
|
}
|
|
}
|
|
|
|
/* Must be called on unlocked socket. */
|
|
static void l2cap_sock_close(struct sock *sk)
|
|
{
|
|
l2cap_sock_clear_timer(sk);
|
|
lock_sock(sk);
|
|
__l2cap_sock_close(sk, ECONNRESET);
|
|
release_sock(sk);
|
|
l2cap_sock_kill(sk);
|
|
}
|
|
|
|
static void l2cap_sock_init(struct sock *sk, struct sock *parent)
|
|
{
|
|
struct l2cap_pinfo *pi = l2cap_pi(sk);
|
|
|
|
BT_DBG("sk %p", sk);
|
|
|
|
if (parent) {
|
|
sk->sk_type = parent->sk_type;
|
|
bt_sk(sk)->defer_setup = bt_sk(parent)->defer_setup;
|
|
|
|
pi->imtu = l2cap_pi(parent)->imtu;
|
|
pi->omtu = l2cap_pi(parent)->omtu;
|
|
pi->mode = l2cap_pi(parent)->mode;
|
|
pi->fcs = l2cap_pi(parent)->fcs;
|
|
pi->sec_level = l2cap_pi(parent)->sec_level;
|
|
pi->role_switch = l2cap_pi(parent)->role_switch;
|
|
pi->force_reliable = l2cap_pi(parent)->force_reliable;
|
|
} else {
|
|
pi->imtu = L2CAP_DEFAULT_MTU;
|
|
pi->omtu = 0;
|
|
pi->mode = L2CAP_MODE_BASIC;
|
|
pi->fcs = L2CAP_FCS_CRC16;
|
|
pi->sec_level = BT_SECURITY_LOW;
|
|
pi->role_switch = 0;
|
|
pi->force_reliable = 0;
|
|
}
|
|
|
|
/* Default config options */
|
|
pi->conf_len = 0;
|
|
pi->flush_to = L2CAP_DEFAULT_FLUSH_TO;
|
|
skb_queue_head_init(TX_QUEUE(sk));
|
|
skb_queue_head_init(SREJ_QUEUE(sk));
|
|
INIT_LIST_HEAD(SREJ_LIST(sk));
|
|
}
|
|
|
|
static struct proto l2cap_proto = {
|
|
.name = "L2CAP",
|
|
.owner = THIS_MODULE,
|
|
.obj_size = sizeof(struct l2cap_pinfo)
|
|
};
|
|
|
|
static struct sock *l2cap_sock_alloc(struct net *net, struct socket *sock, int proto, gfp_t prio)
|
|
{
|
|
struct sock *sk;
|
|
|
|
sk = sk_alloc(net, PF_BLUETOOTH, prio, &l2cap_proto);
|
|
if (!sk)
|
|
return NULL;
|
|
|
|
sock_init_data(sock, sk);
|
|
INIT_LIST_HEAD(&bt_sk(sk)->accept_q);
|
|
|
|
sk->sk_destruct = l2cap_sock_destruct;
|
|
sk->sk_sndtimeo = msecs_to_jiffies(L2CAP_CONN_TIMEOUT);
|
|
|
|
sock_reset_flag(sk, SOCK_ZAPPED);
|
|
|
|
sk->sk_protocol = proto;
|
|
sk->sk_state = BT_OPEN;
|
|
|
|
setup_timer(&sk->sk_timer, l2cap_sock_timeout, (unsigned long) sk);
|
|
|
|
bt_sock_link(&l2cap_sk_list, sk);
|
|
return sk;
|
|
}
|
|
|
|
static int l2cap_sock_create(struct net *net, struct socket *sock, int protocol,
|
|
int kern)
|
|
{
|
|
struct sock *sk;
|
|
|
|
BT_DBG("sock %p", sock);
|
|
|
|
sock->state = SS_UNCONNECTED;
|
|
|
|
if (sock->type != SOCK_SEQPACKET &&
|
|
sock->type != SOCK_DGRAM && sock->type != SOCK_RAW)
|
|
return -ESOCKTNOSUPPORT;
|
|
|
|
if (sock->type == SOCK_RAW && !kern && !capable(CAP_NET_RAW))
|
|
return -EPERM;
|
|
|
|
sock->ops = &l2cap_sock_ops;
|
|
|
|
sk = l2cap_sock_alloc(net, sock, protocol, GFP_ATOMIC);
|
|
if (!sk)
|
|
return -ENOMEM;
|
|
|
|
l2cap_sock_init(sk, NULL);
|
|
return 0;
|
|
}
|
|
|
|
static int l2cap_sock_bind(struct socket *sock, struct sockaddr *addr, int alen)
|
|
{
|
|
struct sock *sk = sock->sk;
|
|
struct sockaddr_l2 la;
|
|
int len, err = 0;
|
|
|
|
BT_DBG("sk %p", sk);
|
|
|
|
if (!addr || addr->sa_family != AF_BLUETOOTH)
|
|
return -EINVAL;
|
|
|
|
memset(&la, 0, sizeof(la));
|
|
len = min_t(unsigned int, sizeof(la), alen);
|
|
memcpy(&la, addr, len);
|
|
|
|
if (la.l2_cid)
|
|
return -EINVAL;
|
|
|
|
lock_sock(sk);
|
|
|
|
if (sk->sk_state != BT_OPEN) {
|
|
err = -EBADFD;
|
|
goto done;
|
|
}
|
|
|
|
if (la.l2_psm && __le16_to_cpu(la.l2_psm) < 0x1001 &&
|
|
!capable(CAP_NET_BIND_SERVICE)) {
|
|
err = -EACCES;
|
|
goto done;
|
|
}
|
|
|
|
write_lock_bh(&l2cap_sk_list.lock);
|
|
|
|
if (la.l2_psm && __l2cap_get_sock_by_addr(la.l2_psm, &la.l2_bdaddr)) {
|
|
err = -EADDRINUSE;
|
|
} else {
|
|
/* Save source address */
|
|
bacpy(&bt_sk(sk)->src, &la.l2_bdaddr);
|
|
l2cap_pi(sk)->psm = la.l2_psm;
|
|
l2cap_pi(sk)->sport = la.l2_psm;
|
|
sk->sk_state = BT_BOUND;
|
|
|
|
if (__le16_to_cpu(la.l2_psm) == 0x0001 ||
|
|
__le16_to_cpu(la.l2_psm) == 0x0003)
|
|
l2cap_pi(sk)->sec_level = BT_SECURITY_SDP;
|
|
}
|
|
|
|
write_unlock_bh(&l2cap_sk_list.lock);
|
|
|
|
done:
|
|
release_sock(sk);
|
|
return err;
|
|
}
|
|
|
|
static int l2cap_do_connect(struct sock *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),
|
|
l2cap_pi(sk)->psm);
|
|
|
|
hdev = hci_get_route(dst, src);
|
|
if (!hdev)
|
|
return -EHOSTUNREACH;
|
|
|
|
hci_dev_lock_bh(hdev);
|
|
|
|
err = -ENOMEM;
|
|
|
|
if (sk->sk_type == SOCK_RAW) {
|
|
switch (l2cap_pi(sk)->sec_level) {
|
|
case BT_SECURITY_HIGH:
|
|
auth_type = HCI_AT_DEDICATED_BONDING_MITM;
|
|
break;
|
|
case BT_SECURITY_MEDIUM:
|
|
auth_type = HCI_AT_DEDICATED_BONDING;
|
|
break;
|
|
default:
|
|
auth_type = HCI_AT_NO_BONDING;
|
|
break;
|
|
}
|
|
} else if (l2cap_pi(sk)->psm == cpu_to_le16(0x0001)) {
|
|
if (l2cap_pi(sk)->sec_level == BT_SECURITY_HIGH)
|
|
auth_type = HCI_AT_NO_BONDING_MITM;
|
|
else
|
|
auth_type = HCI_AT_NO_BONDING;
|
|
|
|
if (l2cap_pi(sk)->sec_level == BT_SECURITY_LOW)
|
|
l2cap_pi(sk)->sec_level = BT_SECURITY_SDP;
|
|
} else {
|
|
switch (l2cap_pi(sk)->sec_level) {
|
|
case BT_SECURITY_HIGH:
|
|
auth_type = HCI_AT_GENERAL_BONDING_MITM;
|
|
break;
|
|
case BT_SECURITY_MEDIUM:
|
|
auth_type = HCI_AT_GENERAL_BONDING;
|
|
break;
|
|
default:
|
|
auth_type = HCI_AT_NO_BONDING;
|
|
break;
|
|
}
|
|
}
|
|
|
|
hcon = hci_connect(hdev, ACL_LINK, dst,
|
|
l2cap_pi(sk)->sec_level, auth_type);
|
|
if (!hcon)
|
|
goto done;
|
|
|
|
conn = l2cap_conn_add(hcon, 0);
|
|
if (!conn) {
|
|
hci_conn_put(hcon);
|
|
goto done;
|
|
}
|
|
|
|
err = 0;
|
|
|
|
/* Update source addr of the socket */
|
|
bacpy(src, conn->src);
|
|
|
|
l2cap_chan_add(conn, sk, NULL);
|
|
|
|
sk->sk_state = BT_CONNECT;
|
|
l2cap_sock_set_timer(sk, sk->sk_sndtimeo);
|
|
|
|
if (hcon->state == BT_CONNECTED) {
|
|
if (sk->sk_type != SOCK_SEQPACKET) {
|
|
l2cap_sock_clear_timer(sk);
|
|
sk->sk_state = BT_CONNECTED;
|
|
} else
|
|
l2cap_do_start(sk);
|
|
}
|
|
|
|
done:
|
|
hci_dev_unlock_bh(hdev);
|
|
hci_dev_put(hdev);
|
|
return err;
|
|
}
|
|
|
|
static int l2cap_sock_connect(struct socket *sock, struct sockaddr *addr, int alen, int flags)
|
|
{
|
|
struct sock *sk = sock->sk;
|
|
struct sockaddr_l2 la;
|
|
int len, err = 0;
|
|
|
|
BT_DBG("sk %p", sk);
|
|
|
|
if (!addr || addr->sa_family != AF_BLUETOOTH)
|
|
return -EINVAL;
|
|
|
|
memset(&la, 0, sizeof(la));
|
|
len = min_t(unsigned int, sizeof(la), alen);
|
|
memcpy(&la, addr, len);
|
|
|
|
if (la.l2_cid)
|
|
return -EINVAL;
|
|
|
|
lock_sock(sk);
|
|
|
|
if (sk->sk_type == SOCK_SEQPACKET && !la.l2_psm) {
|
|
err = -EINVAL;
|
|
goto done;
|
|
}
|
|
|
|
switch (l2cap_pi(sk)->mode) {
|
|
case L2CAP_MODE_BASIC:
|
|
break;
|
|
case L2CAP_MODE_ERTM:
|
|
case L2CAP_MODE_STREAMING:
|
|
if (enable_ertm)
|
|
break;
|
|
/* fall through */
|
|
default:
|
|
err = -ENOTSUPP;
|
|
goto done;
|
|
}
|
|
|
|
switch (sk->sk_state) {
|
|
case BT_CONNECT:
|
|
case BT_CONNECT2:
|
|
case BT_CONFIG:
|
|
/* Already connecting */
|
|
goto wait;
|
|
|
|
case BT_CONNECTED:
|
|
/* Already connected */
|
|
goto done;
|
|
|
|
case BT_OPEN:
|
|
case BT_BOUND:
|
|
/* Can connect */
|
|
break;
|
|
|
|
default:
|
|
err = -EBADFD;
|
|
goto done;
|
|
}
|
|
|
|
/* Set destination address and psm */
|
|
bacpy(&bt_sk(sk)->dst, &la.l2_bdaddr);
|
|
l2cap_pi(sk)->psm = la.l2_psm;
|
|
|
|
err = l2cap_do_connect(sk);
|
|
if (err)
|
|
goto done;
|
|
|
|
wait:
|
|
err = bt_sock_wait_state(sk, BT_CONNECTED,
|
|
sock_sndtimeo(sk, flags & O_NONBLOCK));
|
|
done:
|
|
release_sock(sk);
|
|
return err;
|
|
}
|
|
|
|
static int l2cap_sock_listen(struct socket *sock, int backlog)
|
|
{
|
|
struct sock *sk = sock->sk;
|
|
int err = 0;
|
|
|
|
BT_DBG("sk %p backlog %d", sk, backlog);
|
|
|
|
lock_sock(sk);
|
|
|
|
if (sk->sk_state != BT_BOUND || sock->type != SOCK_SEQPACKET) {
|
|
err = -EBADFD;
|
|
goto done;
|
|
}
|
|
|
|
switch (l2cap_pi(sk)->mode) {
|
|
case L2CAP_MODE_BASIC:
|
|
break;
|
|
case L2CAP_MODE_ERTM:
|
|
case L2CAP_MODE_STREAMING:
|
|
if (enable_ertm)
|
|
break;
|
|
/* fall through */
|
|
default:
|
|
err = -ENOTSUPP;
|
|
goto done;
|
|
}
|
|
|
|
if (!l2cap_pi(sk)->psm) {
|
|
bdaddr_t *src = &bt_sk(sk)->src;
|
|
u16 psm;
|
|
|
|
err = -EINVAL;
|
|
|
|
write_lock_bh(&l2cap_sk_list.lock);
|
|
|
|
for (psm = 0x1001; psm < 0x1100; psm += 2)
|
|
if (!__l2cap_get_sock_by_addr(cpu_to_le16(psm), src)) {
|
|
l2cap_pi(sk)->psm = cpu_to_le16(psm);
|
|
l2cap_pi(sk)->sport = cpu_to_le16(psm);
|
|
err = 0;
|
|
break;
|
|
}
|
|
|
|
write_unlock_bh(&l2cap_sk_list.lock);
|
|
|
|
if (err < 0)
|
|
goto done;
|
|
}
|
|
|
|
sk->sk_max_ack_backlog = backlog;
|
|
sk->sk_ack_backlog = 0;
|
|
sk->sk_state = BT_LISTEN;
|
|
|
|
done:
|
|
release_sock(sk);
|
|
return err;
|
|
}
|
|
|
|
static int l2cap_sock_accept(struct socket *sock, struct socket *newsock, int flags)
|
|
{
|
|
DECLARE_WAITQUEUE(wait, current);
|
|
struct sock *sk = sock->sk, *nsk;
|
|
long timeo;
|
|
int err = 0;
|
|
|
|
lock_sock_nested(sk, SINGLE_DEPTH_NESTING);
|
|
|
|
if (sk->sk_state != BT_LISTEN) {
|
|
err = -EBADFD;
|
|
goto done;
|
|
}
|
|
|
|
timeo = sock_rcvtimeo(sk, flags & O_NONBLOCK);
|
|
|
|
BT_DBG("sk %p timeo %ld", sk, timeo);
|
|
|
|
/* Wait for an incoming connection. (wake-one). */
|
|
add_wait_queue_exclusive(sk->sk_sleep, &wait);
|
|
while (!(nsk = bt_accept_dequeue(sk, newsock))) {
|
|
set_current_state(TASK_INTERRUPTIBLE);
|
|
if (!timeo) {
|
|
err = -EAGAIN;
|
|
break;
|
|
}
|
|
|
|
release_sock(sk);
|
|
timeo = schedule_timeout(timeo);
|
|
lock_sock_nested(sk, SINGLE_DEPTH_NESTING);
|
|
|
|
if (sk->sk_state != BT_LISTEN) {
|
|
err = -EBADFD;
|
|
break;
|
|
}
|
|
|
|
if (signal_pending(current)) {
|
|
err = sock_intr_errno(timeo);
|
|
break;
|
|
}
|
|
}
|
|
set_current_state(TASK_RUNNING);
|
|
remove_wait_queue(sk->sk_sleep, &wait);
|
|
|
|
if (err)
|
|
goto done;
|
|
|
|
newsock->state = SS_CONNECTED;
|
|
|
|
BT_DBG("new socket %p", nsk);
|
|
|
|
done:
|
|
release_sock(sk);
|
|
return err;
|
|
}
|
|
|
|
static int l2cap_sock_getname(struct socket *sock, struct sockaddr *addr, int *len, int peer)
|
|
{
|
|
struct sockaddr_l2 *la = (struct sockaddr_l2 *) addr;
|
|
struct sock *sk = sock->sk;
|
|
|
|
BT_DBG("sock %p, sk %p", sock, sk);
|
|
|
|
addr->sa_family = AF_BLUETOOTH;
|
|
*len = sizeof(struct sockaddr_l2);
|
|
|
|
if (peer) {
|
|
la->l2_psm = l2cap_pi(sk)->psm;
|
|
bacpy(&la->l2_bdaddr, &bt_sk(sk)->dst);
|
|
la->l2_cid = cpu_to_le16(l2cap_pi(sk)->dcid);
|
|
} else {
|
|
la->l2_psm = l2cap_pi(sk)->sport;
|
|
bacpy(&la->l2_bdaddr, &bt_sk(sk)->src);
|
|
la->l2_cid = cpu_to_le16(l2cap_pi(sk)->scid);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void l2cap_monitor_timeout(unsigned long arg)
|
|
{
|
|
struct sock *sk = (void *) arg;
|
|
u16 control;
|
|
|
|
bh_lock_sock(sk);
|
|
if (l2cap_pi(sk)->retry_count >= l2cap_pi(sk)->remote_max_tx) {
|
|
l2cap_send_disconn_req(l2cap_pi(sk)->conn, sk);
|
|
return;
|
|
}
|
|
|
|
l2cap_pi(sk)->retry_count++;
|
|
__mod_monitor_timer();
|
|
|
|
control = L2CAP_CTRL_POLL;
|
|
l2cap_send_rr_or_rnr(l2cap_pi(sk), control);
|
|
bh_unlock_sock(sk);
|
|
}
|
|
|
|
static void l2cap_retrans_timeout(unsigned long arg)
|
|
{
|
|
struct sock *sk = (void *) arg;
|
|
u16 control;
|
|
|
|
bh_lock_sock(sk);
|
|
l2cap_pi(sk)->retry_count = 1;
|
|
__mod_monitor_timer();
|
|
|
|
l2cap_pi(sk)->conn_state |= L2CAP_CONN_WAIT_F;
|
|
|
|
control = L2CAP_CTRL_POLL;
|
|
l2cap_send_rr_or_rnr(l2cap_pi(sk), control);
|
|
bh_unlock_sock(sk);
|
|
}
|
|
|
|
static void l2cap_drop_acked_frames(struct sock *sk)
|
|
{
|
|
struct sk_buff *skb;
|
|
|
|
while ((skb = skb_peek(TX_QUEUE(sk)))) {
|
|
if (bt_cb(skb)->tx_seq == l2cap_pi(sk)->expected_ack_seq)
|
|
break;
|
|
|
|
skb = skb_dequeue(TX_QUEUE(sk));
|
|
kfree_skb(skb);
|
|
|
|
l2cap_pi(sk)->unacked_frames--;
|
|
}
|
|
|
|
if (!l2cap_pi(sk)->unacked_frames)
|
|
del_timer(&l2cap_pi(sk)->retrans_timer);
|
|
|
|
return;
|
|
}
|
|
|
|
static inline int l2cap_do_send(struct sock *sk, struct sk_buff *skb)
|
|
{
|
|
struct l2cap_pinfo *pi = l2cap_pi(sk);
|
|
int err;
|
|
|
|
BT_DBG("sk %p, skb %p len %d", sk, skb, skb->len);
|
|
|
|
err = hci_send_acl(pi->conn->hcon, skb, 0);
|
|
if (err < 0)
|
|
kfree_skb(skb);
|
|
|
|
return err;
|
|
}
|
|
|
|
static int l2cap_streaming_send(struct sock *sk)
|
|
{
|
|
struct sk_buff *skb, *tx_skb;
|
|
struct l2cap_pinfo *pi = l2cap_pi(sk);
|
|
u16 control, fcs;
|
|
int err;
|
|
|
|
while ((skb = sk->sk_send_head)) {
|
|
tx_skb = skb_clone(skb, GFP_ATOMIC);
|
|
|
|
control = get_unaligned_le16(tx_skb->data + L2CAP_HDR_SIZE);
|
|
control |= pi->next_tx_seq << L2CAP_CTRL_TXSEQ_SHIFT;
|
|
put_unaligned_le16(control, tx_skb->data + L2CAP_HDR_SIZE);
|
|
|
|
if (l2cap_pi(sk)->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);
|
|
}
|
|
|
|
err = l2cap_do_send(sk, tx_skb);
|
|
if (err < 0) {
|
|
l2cap_send_disconn_req(pi->conn, sk);
|
|
return err;
|
|
}
|
|
|
|
pi->next_tx_seq = (pi->next_tx_seq + 1) % 64;
|
|
|
|
if (skb_queue_is_last(TX_QUEUE(sk), skb))
|
|
sk->sk_send_head = NULL;
|
|
else
|
|
sk->sk_send_head = skb_queue_next(TX_QUEUE(sk), skb);
|
|
|
|
skb = skb_dequeue(TX_QUEUE(sk));
|
|
kfree_skb(skb);
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static int l2cap_retransmit_frame(struct sock *sk, u8 tx_seq)
|
|
{
|
|
struct l2cap_pinfo *pi = l2cap_pi(sk);
|
|
struct sk_buff *skb, *tx_skb;
|
|
u16 control, fcs;
|
|
int err;
|
|
|
|
skb = skb_peek(TX_QUEUE(sk));
|
|
do {
|
|
if (bt_cb(skb)->tx_seq != tx_seq) {
|
|
if (skb_queue_is_last(TX_QUEUE(sk), skb))
|
|
break;
|
|
skb = skb_queue_next(TX_QUEUE(sk), skb);
|
|
continue;
|
|
}
|
|
|
|
if (pi->remote_max_tx &&
|
|
bt_cb(skb)->retries == pi->remote_max_tx) {
|
|
l2cap_send_disconn_req(pi->conn, sk);
|
|
break;
|
|
}
|
|
|
|
tx_skb = skb_clone(skb, GFP_ATOMIC);
|
|
bt_cb(skb)->retries++;
|
|
control = get_unaligned_le16(tx_skb->data + L2CAP_HDR_SIZE);
|
|
control |= (pi->req_seq << L2CAP_CTRL_REQSEQ_SHIFT)
|
|
| (tx_seq << L2CAP_CTRL_TXSEQ_SHIFT);
|
|
put_unaligned_le16(control, tx_skb->data + L2CAP_HDR_SIZE);
|
|
|
|
if (l2cap_pi(sk)->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);
|
|
}
|
|
|
|
err = l2cap_do_send(sk, tx_skb);
|
|
if (err < 0) {
|
|
l2cap_send_disconn_req(pi->conn, sk);
|
|
return err;
|
|
}
|
|
break;
|
|
} while(1);
|
|
return 0;
|
|
}
|
|
|
|
static int l2cap_ertm_send(struct sock *sk)
|
|
{
|
|
struct sk_buff *skb, *tx_skb;
|
|
struct l2cap_pinfo *pi = l2cap_pi(sk);
|
|
u16 control, fcs;
|
|
int err;
|
|
|
|
if (pi->conn_state & L2CAP_CONN_WAIT_F)
|
|
return 0;
|
|
|
|
while ((skb = sk->sk_send_head) && (!l2cap_tx_window_full(sk)) &&
|
|
!(pi->conn_state & L2CAP_CONN_REMOTE_BUSY)) {
|
|
tx_skb = skb_clone(skb, GFP_ATOMIC);
|
|
|
|
if (pi->remote_max_tx &&
|
|
bt_cb(skb)->retries == pi->remote_max_tx) {
|
|
l2cap_send_disconn_req(pi->conn, sk);
|
|
break;
|
|
}
|
|
|
|
bt_cb(skb)->retries++;
|
|
|
|
control = get_unaligned_le16(tx_skb->data + L2CAP_HDR_SIZE);
|
|
control |= (pi->req_seq << L2CAP_CTRL_REQSEQ_SHIFT)
|
|
| (pi->next_tx_seq << L2CAP_CTRL_TXSEQ_SHIFT);
|
|
put_unaligned_le16(control, tx_skb->data + L2CAP_HDR_SIZE);
|
|
|
|
|
|
if (l2cap_pi(sk)->fcs == L2CAP_FCS_CRC16) {
|
|
fcs = crc16(0, (u8 *)skb->data, tx_skb->len - 2);
|
|
put_unaligned_le16(fcs, skb->data + tx_skb->len - 2);
|
|
}
|
|
|
|
err = l2cap_do_send(sk, tx_skb);
|
|
if (err < 0) {
|
|
l2cap_send_disconn_req(pi->conn, sk);
|
|
return err;
|
|
}
|
|
__mod_retrans_timer();
|
|
|
|
bt_cb(skb)->tx_seq = pi->next_tx_seq;
|
|
pi->next_tx_seq = (pi->next_tx_seq + 1) % 64;
|
|
|
|
pi->unacked_frames++;
|
|
|
|
if (skb_queue_is_last(TX_QUEUE(sk), skb))
|
|
sk->sk_send_head = NULL;
|
|
else
|
|
sk->sk_send_head = skb_queue_next(TX_QUEUE(sk), skb);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
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)->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 -EFAULT;
|
|
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 sock *sk, struct msghdr *msg, size_t len)
|
|
{
|
|
struct l2cap_conn *conn = l2cap_pi(sk)->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(-ENOMEM);
|
|
|
|
/* Create L2CAP header */
|
|
lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE);
|
|
lh->cid = cpu_to_le16(l2cap_pi(sk)->dcid);
|
|
lh->len = cpu_to_le16(len + (hlen - L2CAP_HDR_SIZE));
|
|
put_unaligned_le16(l2cap_pi(sk)->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 sock *sk, struct msghdr *msg, size_t len)
|
|
{
|
|
struct l2cap_conn *conn = l2cap_pi(sk)->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(-ENOMEM);
|
|
|
|
/* Create L2CAP header */
|
|
lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE);
|
|
lh->cid = cpu_to_le16(l2cap_pi(sk)->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 sock *sk, struct msghdr *msg, size_t len, u16 control, u16 sdulen)
|
|
{
|
|
struct l2cap_conn *conn = l2cap_pi(sk)->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 (sdulen)
|
|
hlen += 2;
|
|
|
|
if (l2cap_pi(sk)->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(-ENOMEM);
|
|
|
|
/* Create L2CAP header */
|
|
lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE);
|
|
lh->cid = cpu_to_le16(l2cap_pi(sk)->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 (l2cap_pi(sk)->fcs == L2CAP_FCS_CRC16)
|
|
put_unaligned_le16(0, skb_put(skb, 2));
|
|
|
|
bt_cb(skb)->retries = 0;
|
|
return skb;
|
|
}
|
|
|
|
static inline int l2cap_sar_segment_sdu(struct sock *sk, struct msghdr *msg, size_t len)
|
|
{
|
|
struct l2cap_pinfo *pi = l2cap_pi(sk);
|
|
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(sk, msg, pi->max_pdu_size, control, len);
|
|
if (IS_ERR(skb))
|
|
return PTR_ERR(skb);
|
|
|
|
__skb_queue_tail(&sar_queue, skb);
|
|
len -= pi->max_pdu_size;
|
|
size +=pi->max_pdu_size;
|
|
control = 0;
|
|
|
|
while (len > 0) {
|
|
size_t buflen;
|
|
|
|
if (len > pi->max_pdu_size) {
|
|
control |= L2CAP_SDU_CONTINUE;
|
|
buflen = pi->max_pdu_size;
|
|
} else {
|
|
control |= L2CAP_SDU_END;
|
|
buflen = len;
|
|
}
|
|
|
|
skb = l2cap_create_iframe_pdu(sk, 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;
|
|
control = 0;
|
|
}
|
|
skb_queue_splice_tail(&sar_queue, TX_QUEUE(sk));
|
|
if (sk->sk_send_head == NULL)
|
|
sk->sk_send_head = sar_queue.next;
|
|
|
|
return size;
|
|
}
|
|
|
|
static int l2cap_sock_sendmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *msg, size_t len)
|
|
{
|
|
struct sock *sk = sock->sk;
|
|
struct l2cap_pinfo *pi = l2cap_pi(sk);
|
|
struct sk_buff *skb;
|
|
u16 control;
|
|
int err;
|
|
|
|
BT_DBG("sock %p, sk %p", sock, sk);
|
|
|
|
err = sock_error(sk);
|
|
if (err)
|
|
return err;
|
|
|
|
if (msg->msg_flags & MSG_OOB)
|
|
return -EOPNOTSUPP;
|
|
|
|
/* Check outgoing MTU */
|
|
if (sk->sk_type == SOCK_SEQPACKET && pi->mode == L2CAP_MODE_BASIC &&
|
|
len > pi->omtu)
|
|
return -EINVAL;
|
|
|
|
lock_sock(sk);
|
|
|
|
if (sk->sk_state != BT_CONNECTED) {
|
|
err = -ENOTCONN;
|
|
goto done;
|
|
}
|
|
|
|
/* Connectionless channel */
|
|
if (sk->sk_type == SOCK_DGRAM) {
|
|
skb = l2cap_create_connless_pdu(sk, msg, len);
|
|
err = l2cap_do_send(sk, skb);
|
|
goto done;
|
|
}
|
|
|
|
switch (pi->mode) {
|
|
case L2CAP_MODE_BASIC:
|
|
/* Create a basic PDU */
|
|
skb = l2cap_create_basic_pdu(sk, msg, len);
|
|
if (IS_ERR(skb)) {
|
|
err = PTR_ERR(skb);
|
|
goto done;
|
|
}
|
|
|
|
err = l2cap_do_send(sk, skb);
|
|
if (!err)
|
|
err = len;
|
|
break;
|
|
|
|
case L2CAP_MODE_ERTM:
|
|
case L2CAP_MODE_STREAMING:
|
|
/* Entire SDU fits into one PDU */
|
|
if (len <= pi->max_pdu_size) {
|
|
control = L2CAP_SDU_UNSEGMENTED;
|
|
skb = l2cap_create_iframe_pdu(sk, msg, len, control, 0);
|
|
if (IS_ERR(skb)) {
|
|
err = PTR_ERR(skb);
|
|
goto done;
|
|
}
|
|
__skb_queue_tail(TX_QUEUE(sk), skb);
|
|
if (sk->sk_send_head == NULL)
|
|
sk->sk_send_head = skb;
|
|
} else {
|
|
/* Segment SDU into multiples PDUs */
|
|
err = l2cap_sar_segment_sdu(sk, msg, len);
|
|
if (err < 0)
|
|
goto done;
|
|
}
|
|
|
|
if (pi->mode == L2CAP_MODE_STREAMING)
|
|
err = l2cap_streaming_send(sk);
|
|
else
|
|
err = l2cap_ertm_send(sk);
|
|
|
|
if (!err)
|
|
err = len;
|
|
break;
|
|
|
|
default:
|
|
BT_DBG("bad state %1.1x", pi->mode);
|
|
err = -EINVAL;
|
|
}
|
|
|
|
done:
|
|
release_sock(sk);
|
|
return err;
|
|
}
|
|
|
|
static int l2cap_sock_recvmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *msg, size_t len, int flags)
|
|
{
|
|
struct sock *sk = sock->sk;
|
|
|
|
lock_sock(sk);
|
|
|
|
if (sk->sk_state == BT_CONNECT2 && bt_sk(sk)->defer_setup) {
|
|
struct l2cap_conn_rsp rsp;
|
|
|
|
sk->sk_state = BT_CONFIG;
|
|
|
|
rsp.scid = cpu_to_le16(l2cap_pi(sk)->dcid);
|
|
rsp.dcid = cpu_to_le16(l2cap_pi(sk)->scid);
|
|
rsp.result = cpu_to_le16(L2CAP_CR_SUCCESS);
|
|
rsp.status = cpu_to_le16(L2CAP_CS_NO_INFO);
|
|
l2cap_send_cmd(l2cap_pi(sk)->conn, l2cap_pi(sk)->ident,
|
|
L2CAP_CONN_RSP, sizeof(rsp), &rsp);
|
|
|
|
release_sock(sk);
|
|
return 0;
|
|
}
|
|
|
|
release_sock(sk);
|
|
|
|
return bt_sock_recvmsg(iocb, sock, msg, len, flags);
|
|
}
|
|
|
|
static int l2cap_sock_setsockopt_old(struct socket *sock, int optname, char __user *optval, unsigned int optlen)
|
|
{
|
|
struct sock *sk = sock->sk;
|
|
struct l2cap_options opts;
|
|
int len, err = 0;
|
|
u32 opt;
|
|
|
|
BT_DBG("sk %p", sk);
|
|
|
|
lock_sock(sk);
|
|
|
|
switch (optname) {
|
|
case L2CAP_OPTIONS:
|
|
opts.imtu = l2cap_pi(sk)->imtu;
|
|
opts.omtu = l2cap_pi(sk)->omtu;
|
|
opts.flush_to = l2cap_pi(sk)->flush_to;
|
|
opts.mode = l2cap_pi(sk)->mode;
|
|
opts.fcs = l2cap_pi(sk)->fcs;
|
|
|
|
len = min_t(unsigned int, sizeof(opts), optlen);
|
|
if (copy_from_user((char *) &opts, optval, len)) {
|
|
err = -EFAULT;
|
|
break;
|
|
}
|
|
|
|
l2cap_pi(sk)->imtu = opts.imtu;
|
|
l2cap_pi(sk)->omtu = opts.omtu;
|
|
l2cap_pi(sk)->mode = opts.mode;
|
|
l2cap_pi(sk)->fcs = opts.fcs;
|
|
break;
|
|
|
|
case L2CAP_LM:
|
|
if (get_user(opt, (u32 __user *) optval)) {
|
|
err = -EFAULT;
|
|
break;
|
|
}
|
|
|
|
if (opt & L2CAP_LM_AUTH)
|
|
l2cap_pi(sk)->sec_level = BT_SECURITY_LOW;
|
|
if (opt & L2CAP_LM_ENCRYPT)
|
|
l2cap_pi(sk)->sec_level = BT_SECURITY_MEDIUM;
|
|
if (opt & L2CAP_LM_SECURE)
|
|
l2cap_pi(sk)->sec_level = BT_SECURITY_HIGH;
|
|
|
|
l2cap_pi(sk)->role_switch = (opt & L2CAP_LM_MASTER);
|
|
l2cap_pi(sk)->force_reliable = (opt & L2CAP_LM_RELIABLE);
|
|
break;
|
|
|
|
default:
|
|
err = -ENOPROTOOPT;
|
|
break;
|
|
}
|
|
|
|
release_sock(sk);
|
|
return err;
|
|
}
|
|
|
|
static int l2cap_sock_setsockopt(struct socket *sock, int level, int optname, char __user *optval, unsigned int optlen)
|
|
{
|
|
struct sock *sk = sock->sk;
|
|
struct bt_security sec;
|
|
int len, err = 0;
|
|
u32 opt;
|
|
|
|
BT_DBG("sk %p", sk);
|
|
|
|
if (level == SOL_L2CAP)
|
|
return l2cap_sock_setsockopt_old(sock, optname, optval, optlen);
|
|
|
|
if (level != SOL_BLUETOOTH)
|
|
return -ENOPROTOOPT;
|
|
|
|
lock_sock(sk);
|
|
|
|
switch (optname) {
|
|
case BT_SECURITY:
|
|
if (sk->sk_type != SOCK_SEQPACKET && sk->sk_type != SOCK_RAW) {
|
|
err = -EINVAL;
|
|
break;
|
|
}
|
|
|
|
sec.level = BT_SECURITY_LOW;
|
|
|
|
len = min_t(unsigned int, sizeof(sec), optlen);
|
|
if (copy_from_user((char *) &sec, optval, len)) {
|
|
err = -EFAULT;
|
|
break;
|
|
}
|
|
|
|
if (sec.level < BT_SECURITY_LOW ||
|
|
sec.level > BT_SECURITY_HIGH) {
|
|
err = -EINVAL;
|
|
break;
|
|
}
|
|
|
|
l2cap_pi(sk)->sec_level = sec.level;
|
|
break;
|
|
|
|
case BT_DEFER_SETUP:
|
|
if (sk->sk_state != BT_BOUND && sk->sk_state != BT_LISTEN) {
|
|
err = -EINVAL;
|
|
break;
|
|
}
|
|
|
|
if (get_user(opt, (u32 __user *) optval)) {
|
|
err = -EFAULT;
|
|
break;
|
|
}
|
|
|
|
bt_sk(sk)->defer_setup = opt;
|
|
break;
|
|
|
|
default:
|
|
err = -ENOPROTOOPT;
|
|
break;
|
|
}
|
|
|
|
release_sock(sk);
|
|
return err;
|
|
}
|
|
|
|
static int l2cap_sock_getsockopt_old(struct socket *sock, int optname, char __user *optval, int __user *optlen)
|
|
{
|
|
struct sock *sk = sock->sk;
|
|
struct l2cap_options opts;
|
|
struct l2cap_conninfo cinfo;
|
|
int len, err = 0;
|
|
u32 opt;
|
|
|
|
BT_DBG("sk %p", sk);
|
|
|
|
if (get_user(len, optlen))
|
|
return -EFAULT;
|
|
|
|
lock_sock(sk);
|
|
|
|
switch (optname) {
|
|
case L2CAP_OPTIONS:
|
|
opts.imtu = l2cap_pi(sk)->imtu;
|
|
opts.omtu = l2cap_pi(sk)->omtu;
|
|
opts.flush_to = l2cap_pi(sk)->flush_to;
|
|
opts.mode = l2cap_pi(sk)->mode;
|
|
opts.fcs = l2cap_pi(sk)->fcs;
|
|
|
|
len = min_t(unsigned int, len, sizeof(opts));
|
|
if (copy_to_user(optval, (char *) &opts, len))
|
|
err = -EFAULT;
|
|
|
|
break;
|
|
|
|
case L2CAP_LM:
|
|
switch (l2cap_pi(sk)->sec_level) {
|
|
case BT_SECURITY_LOW:
|
|
opt = L2CAP_LM_AUTH;
|
|
break;
|
|
case BT_SECURITY_MEDIUM:
|
|
opt = L2CAP_LM_AUTH | L2CAP_LM_ENCRYPT;
|
|
break;
|
|
case BT_SECURITY_HIGH:
|
|
opt = L2CAP_LM_AUTH | L2CAP_LM_ENCRYPT |
|
|
L2CAP_LM_SECURE;
|
|
break;
|
|
default:
|
|
opt = 0;
|
|
break;
|
|
}
|
|
|
|
if (l2cap_pi(sk)->role_switch)
|
|
opt |= L2CAP_LM_MASTER;
|
|
|
|
if (l2cap_pi(sk)->force_reliable)
|
|
opt |= L2CAP_LM_RELIABLE;
|
|
|
|
if (put_user(opt, (u32 __user *) optval))
|
|
err = -EFAULT;
|
|
break;
|
|
|
|
case L2CAP_CONNINFO:
|
|
if (sk->sk_state != BT_CONNECTED &&
|
|
!(sk->sk_state == BT_CONNECT2 &&
|
|
bt_sk(sk)->defer_setup)) {
|
|
err = -ENOTCONN;
|
|
break;
|
|
}
|
|
|
|
cinfo.hci_handle = l2cap_pi(sk)->conn->hcon->handle;
|
|
memcpy(cinfo.dev_class, l2cap_pi(sk)->conn->hcon->dev_class, 3);
|
|
|
|
len = min_t(unsigned int, len, sizeof(cinfo));
|
|
if (copy_to_user(optval, (char *) &cinfo, len))
|
|
err = -EFAULT;
|
|
|
|
break;
|
|
|
|
default:
|
|
err = -ENOPROTOOPT;
|
|
break;
|
|
}
|
|
|
|
release_sock(sk);
|
|
return err;
|
|
}
|
|
|
|
static int l2cap_sock_getsockopt(struct socket *sock, int level, int optname, char __user *optval, int __user *optlen)
|
|
{
|
|
struct sock *sk = sock->sk;
|
|
struct bt_security sec;
|
|
int len, err = 0;
|
|
|
|
BT_DBG("sk %p", sk);
|
|
|
|
if (level == SOL_L2CAP)
|
|
return l2cap_sock_getsockopt_old(sock, optname, optval, optlen);
|
|
|
|
if (level != SOL_BLUETOOTH)
|
|
return -ENOPROTOOPT;
|
|
|
|
if (get_user(len, optlen))
|
|
return -EFAULT;
|
|
|
|
lock_sock(sk);
|
|
|
|
switch (optname) {
|
|
case BT_SECURITY:
|
|
if (sk->sk_type != SOCK_SEQPACKET && sk->sk_type != SOCK_RAW) {
|
|
err = -EINVAL;
|
|
break;
|
|
}
|
|
|
|
sec.level = l2cap_pi(sk)->sec_level;
|
|
|
|
len = min_t(unsigned int, len, sizeof(sec));
|
|
if (copy_to_user(optval, (char *) &sec, len))
|
|
err = -EFAULT;
|
|
|
|
break;
|
|
|
|
case BT_DEFER_SETUP:
|
|
if (sk->sk_state != BT_BOUND && sk->sk_state != BT_LISTEN) {
|
|
err = -EINVAL;
|
|
break;
|
|
}
|
|
|
|
if (put_user(bt_sk(sk)->defer_setup, (u32 __user *) optval))
|
|
err = -EFAULT;
|
|
|
|
break;
|
|
|
|
default:
|
|
err = -ENOPROTOOPT;
|
|
break;
|
|
}
|
|
|
|
release_sock(sk);
|
|
return err;
|
|
}
|
|
|
|
static int l2cap_sock_shutdown(struct socket *sock, int how)
|
|
{
|
|
struct sock *sk = sock->sk;
|
|
int err = 0;
|
|
|
|
BT_DBG("sock %p, sk %p", sock, sk);
|
|
|
|
if (!sk)
|
|
return 0;
|
|
|
|
lock_sock(sk);
|
|
if (!sk->sk_shutdown) {
|
|
sk->sk_shutdown = SHUTDOWN_MASK;
|
|
l2cap_sock_clear_timer(sk);
|
|
__l2cap_sock_close(sk, 0);
|
|
|
|
if (sock_flag(sk, SOCK_LINGER) && sk->sk_lingertime)
|
|
err = bt_sock_wait_state(sk, BT_CLOSED,
|
|
sk->sk_lingertime);
|
|
}
|
|
release_sock(sk);
|
|
return err;
|
|
}
|
|
|
|
static int l2cap_sock_release(struct socket *sock)
|
|
{
|
|
struct sock *sk = sock->sk;
|
|
int err;
|
|
|
|
BT_DBG("sock %p, sk %p", sock, sk);
|
|
|
|
if (!sk)
|
|
return 0;
|
|
|
|
err = l2cap_sock_shutdown(sock, 2);
|
|
|
|
sock_orphan(sk);
|
|
l2cap_sock_kill(sk);
|
|
return err;
|
|
}
|
|
|
|
static void l2cap_chan_ready(struct sock *sk)
|
|
{
|
|
struct sock *parent = bt_sk(sk)->parent;
|
|
|
|
BT_DBG("sk %p, parent %p", sk, parent);
|
|
|
|
l2cap_pi(sk)->conf_state = 0;
|
|
l2cap_sock_clear_timer(sk);
|
|
|
|
if (!parent) {
|
|
/* Outgoing channel.
|
|
* Wake up socket sleeping on connect.
|
|
*/
|
|
sk->sk_state = BT_CONNECTED;
|
|
sk->sk_state_change(sk);
|
|
} else {
|
|
/* Incoming channel.
|
|
* Wake up socket sleeping on accept.
|
|
*/
|
|
parent->sk_data_ready(parent, 0);
|
|
}
|
|
}
|
|
|
|
/* Copy frame to all raw sockets on that connection */
|
|
static void l2cap_raw_recv(struct l2cap_conn *conn, struct sk_buff *skb)
|
|
{
|
|
struct l2cap_chan_list *l = &conn->chan_list;
|
|
struct sk_buff *nskb;
|
|
struct sock *sk;
|
|
|
|
BT_DBG("conn %p", conn);
|
|
|
|
read_lock(&l->lock);
|
|
for (sk = l->head; sk; sk = l2cap_pi(sk)->next_c) {
|
|
if (sk->sk_type != SOCK_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 (sock_queue_rcv_skb(sk, nskb))
|
|
kfree_skb(nskb);
|
|
}
|
|
read_unlock(&l->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);
|
|
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 = __le16_to_cpu(*((__le16 *) opt->val));
|
|
break;
|
|
|
|
case 4:
|
|
*val = __le32_to_cpu(*((__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:
|
|
*((__le16 *) opt->val) = cpu_to_le16(val);
|
|
break;
|
|
|
|
case 4:
|
|
*((__le32 *) opt->val) = cpu_to_le32(val);
|
|
break;
|
|
|
|
default:
|
|
memcpy(opt->val, (void *) val, len);
|
|
break;
|
|
}
|
|
|
|
*ptr += L2CAP_CONF_OPT_SIZE + len;
|
|
}
|
|
|
|
static inline void l2cap_ertm_init(struct sock *sk)
|
|
{
|
|
l2cap_pi(sk)->expected_ack_seq = 0;
|
|
l2cap_pi(sk)->unacked_frames = 0;
|
|
l2cap_pi(sk)->buffer_seq = 0;
|
|
l2cap_pi(sk)->num_to_ack = 0;
|
|
|
|
setup_timer(&l2cap_pi(sk)->retrans_timer,
|
|
l2cap_retrans_timeout, (unsigned long) sk);
|
|
setup_timer(&l2cap_pi(sk)->monitor_timer,
|
|
l2cap_monitor_timeout, (unsigned long) sk);
|
|
|
|
__skb_queue_head_init(SREJ_QUEUE(sk));
|
|
}
|
|
|
|
static int l2cap_mode_supported(__u8 mode, __u32 feat_mask)
|
|
{
|
|
u32 local_feat_mask = l2cap_feat_mask;
|
|
if (enable_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 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 sock *sk, void *data)
|
|
{
|
|
struct l2cap_pinfo *pi = l2cap_pi(sk);
|
|
struct l2cap_conf_req *req = data;
|
|
struct l2cap_conf_rfc rfc = { .mode = L2CAP_MODE_BASIC };
|
|
void *ptr = req->data;
|
|
|
|
BT_DBG("sk %p", sk);
|
|
|
|
if (pi->num_conf_req || pi->num_conf_rsp)
|
|
goto done;
|
|
|
|
switch (pi->mode) {
|
|
case L2CAP_MODE_STREAMING:
|
|
case L2CAP_MODE_ERTM:
|
|
pi->conf_state |= L2CAP_CONF_STATE2_DEVICE;
|
|
if (!l2cap_mode_supported(pi->mode, pi->conn->feat_mask))
|
|
l2cap_send_disconn_req(pi->conn, sk);
|
|
break;
|
|
default:
|
|
pi->mode = l2cap_select_mode(rfc.mode, pi->conn->feat_mask);
|
|
break;
|
|
}
|
|
|
|
done:
|
|
switch (pi->mode) {
|
|
case L2CAP_MODE_BASIC:
|
|
if (pi->imtu != L2CAP_DEFAULT_MTU)
|
|
l2cap_add_conf_opt(&ptr, L2CAP_CONF_MTU, 2, pi->imtu);
|
|
break;
|
|
|
|
case L2CAP_MODE_ERTM:
|
|
rfc.mode = L2CAP_MODE_ERTM;
|
|
rfc.txwin_size = L2CAP_DEFAULT_TX_WINDOW;
|
|
rfc.max_transmit = L2CAP_DEFAULT_MAX_TX;
|
|
rfc.retrans_timeout = 0;
|
|
rfc.monitor_timeout = 0;
|
|
rfc.max_pdu_size = cpu_to_le16(L2CAP_DEFAULT_MAX_PDU_SIZE);
|
|
|
|
l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC,
|
|
sizeof(rfc), (unsigned long) &rfc);
|
|
|
|
if (!(pi->conn->feat_mask & L2CAP_FEAT_FCS))
|
|
break;
|
|
|
|
if (pi->fcs == L2CAP_FCS_NONE ||
|
|
pi->conf_state & L2CAP_CONF_NO_FCS_RECV) {
|
|
pi->fcs = L2CAP_FCS_NONE;
|
|
l2cap_add_conf_opt(&ptr, L2CAP_CONF_FCS, 1, pi->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);
|
|
|
|
l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC,
|
|
sizeof(rfc), (unsigned long) &rfc);
|
|
|
|
if (!(pi->conn->feat_mask & L2CAP_FEAT_FCS))
|
|
break;
|
|
|
|
if (pi->fcs == L2CAP_FCS_NONE ||
|
|
pi->conf_state & L2CAP_CONF_NO_FCS_RECV) {
|
|
pi->fcs = L2CAP_FCS_NONE;
|
|
l2cap_add_conf_opt(&ptr, L2CAP_CONF_FCS, 1, pi->fcs);
|
|
}
|
|
break;
|
|
}
|
|
|
|
/* FIXME: Need actual value of the flush timeout */
|
|
//if (flush_to != L2CAP_DEFAULT_FLUSH_TO)
|
|
// l2cap_add_conf_opt(&ptr, L2CAP_CONF_FLUSH_TO, 2, pi->flush_to);
|
|
|
|
req->dcid = cpu_to_le16(pi->dcid);
|
|
req->flags = cpu_to_le16(0);
|
|
|
|
return ptr - data;
|
|
}
|
|
|
|
static int l2cap_parse_conf_req(struct sock *sk, void *data)
|
|
{
|
|
struct l2cap_pinfo *pi = l2cap_pi(sk);
|
|
struct l2cap_conf_rsp *rsp = data;
|
|
void *ptr = rsp->data;
|
|
void *req = pi->conf_req;
|
|
int len = pi->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("sk %p", sk);
|
|
|
|
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:
|
|
pi->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)
|
|
pi->conf_state |= L2CAP_CONF_NO_FCS_RECV;
|
|
|
|
break;
|
|
|
|
default:
|
|
if (hint)
|
|
break;
|
|
|
|
result = L2CAP_CONF_UNKNOWN;
|
|
*((u8 *) ptr++) = type;
|
|
break;
|
|
}
|
|
}
|
|
|
|
if (pi->num_conf_rsp || pi->num_conf_req)
|
|
goto done;
|
|
|
|
switch (pi->mode) {
|
|
case L2CAP_MODE_STREAMING:
|
|
case L2CAP_MODE_ERTM:
|
|
pi->conf_state |= L2CAP_CONF_STATE2_DEVICE;
|
|
if (!l2cap_mode_supported(pi->mode, pi->conn->feat_mask))
|
|
return -ECONNREFUSED;
|
|
break;
|
|
default:
|
|
pi->mode = l2cap_select_mode(rfc.mode, pi->conn->feat_mask);
|
|
break;
|
|
}
|
|
|
|
done:
|
|
if (pi->mode != rfc.mode) {
|
|
result = L2CAP_CONF_UNACCEPT;
|
|
rfc.mode = pi->mode;
|
|
|
|
if (pi->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 {
|
|
pi->omtu = mtu;
|
|
pi->conf_state |= L2CAP_CONF_MTU_DONE;
|
|
}
|
|
l2cap_add_conf_opt(&ptr, L2CAP_CONF_MTU, 2, pi->omtu);
|
|
|
|
switch (rfc.mode) {
|
|
case L2CAP_MODE_BASIC:
|
|
pi->fcs = L2CAP_FCS_NONE;
|
|
pi->conf_state |= L2CAP_CONF_MODE_DONE;
|
|
break;
|
|
|
|
case L2CAP_MODE_ERTM:
|
|
pi->remote_tx_win = rfc.txwin_size;
|
|
pi->remote_max_tx = rfc.max_transmit;
|
|
pi->max_pdu_size = rfc.max_pdu_size;
|
|
|
|
rfc.retrans_timeout = L2CAP_DEFAULT_RETRANS_TO;
|
|
rfc.monitor_timeout = L2CAP_DEFAULT_MONITOR_TO;
|
|
|
|
pi->conf_state |= L2CAP_CONF_MODE_DONE;
|
|
|
|
l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC,
|
|
sizeof(rfc), (unsigned long) &rfc);
|
|
|
|
break;
|
|
|
|
case L2CAP_MODE_STREAMING:
|
|
pi->remote_tx_win = rfc.txwin_size;
|
|
pi->max_pdu_size = rfc.max_pdu_size;
|
|
|
|
pi->conf_state |= L2CAP_CONF_MODE_DONE;
|
|
|
|
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 = pi->mode;
|
|
}
|
|
|
|
if (result == L2CAP_CONF_SUCCESS)
|
|
pi->conf_state |= L2CAP_CONF_OUTPUT_DONE;
|
|
}
|
|
rsp->scid = cpu_to_le16(pi->dcid);
|
|
rsp->result = cpu_to_le16(result);
|
|
rsp->flags = cpu_to_le16(0x0000);
|
|
|
|
return ptr - data;
|
|
}
|
|
|
|
static int l2cap_parse_conf_rsp(struct sock *sk, void *rsp, int len, void *data, u16 *result)
|
|
{
|
|
struct l2cap_pinfo *pi = l2cap_pi(sk);
|
|
struct l2cap_conf_req *req = data;
|
|
void *ptr = req->data;
|
|
int type, olen;
|
|
unsigned long val;
|
|
struct l2cap_conf_rfc rfc;
|
|
|
|
BT_DBG("sk %p, rsp %p, len %d, req %p", sk, 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;
|
|
pi->omtu = L2CAP_DEFAULT_MIN_MTU;
|
|
} else
|
|
pi->omtu = val;
|
|
l2cap_add_conf_opt(&ptr, L2CAP_CONF_MTU, 2, pi->omtu);
|
|
break;
|
|
|
|
case L2CAP_CONF_FLUSH_TO:
|
|
pi->flush_to = val;
|
|
l2cap_add_conf_opt(&ptr, L2CAP_CONF_FLUSH_TO,
|
|
2, pi->flush_to);
|
|
break;
|
|
|
|
case L2CAP_CONF_RFC:
|
|
if (olen == sizeof(rfc))
|
|
memcpy(&rfc, (void *)val, olen);
|
|
|
|
if ((pi->conf_state & L2CAP_CONF_STATE2_DEVICE) &&
|
|
rfc.mode != pi->mode)
|
|
return -ECONNREFUSED;
|
|
|
|
pi->mode = rfc.mode;
|
|
pi->fcs = 0;
|
|
|
|
l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC,
|
|
sizeof(rfc), (unsigned long) &rfc);
|
|
break;
|
|
}
|
|
}
|
|
|
|
if (*result == L2CAP_CONF_SUCCESS) {
|
|
switch (rfc.mode) {
|
|
case L2CAP_MODE_ERTM:
|
|
pi->remote_tx_win = rfc.txwin_size;
|
|
pi->retrans_timeout = rfc.retrans_timeout;
|
|
pi->monitor_timeout = rfc.monitor_timeout;
|
|
pi->max_pdu_size = le16_to_cpu(rfc.max_pdu_size);
|
|
break;
|
|
case L2CAP_MODE_STREAMING:
|
|
pi->max_pdu_size = le16_to_cpu(rfc.max_pdu_size);
|
|
break;
|
|
}
|
|
}
|
|
|
|
req->dcid = cpu_to_le16(pi->dcid);
|
|
req->flags = cpu_to_le16(0x0000);
|
|
|
|
return ptr - data;
|
|
}
|
|
|
|
static int l2cap_build_conf_rsp(struct sock *sk, void *data, u16 result, u16 flags)
|
|
{
|
|
struct l2cap_conf_rsp *rsp = data;
|
|
void *ptr = rsp->data;
|
|
|
|
BT_DBG("sk %p", sk);
|
|
|
|
rsp->scid = cpu_to_le16(l2cap_pi(sk)->dcid);
|
|
rsp->result = cpu_to_le16(result);
|
|
rsp->flags = cpu_to_le16(flags);
|
|
|
|
return ptr - data;
|
|
}
|
|
|
|
static inline int l2cap_command_rej(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data)
|
|
{
|
|
struct l2cap_cmd_rej *rej = (struct l2cap_cmd_rej *) data;
|
|
|
|
if (rej->reason != 0x0000)
|
|
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_chan_list *list = &conn->chan_list;
|
|
struct l2cap_conn_req *req = (struct l2cap_conn_req *) data;
|
|
struct l2cap_conn_rsp rsp;
|
|
struct sock *sk, *parent;
|
|
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 */
|
|
parent = l2cap_get_sock_by_psm(BT_LISTEN, psm, conn->src);
|
|
if (!parent) {
|
|
result = L2CAP_CR_BAD_PSM;
|
|
goto sendresp;
|
|
}
|
|
|
|
/* 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;
|
|
}
|
|
|
|
sk = l2cap_sock_alloc(sock_net(parent), NULL, BTPROTO_L2CAP, GFP_ATOMIC);
|
|
if (!sk)
|
|
goto response;
|
|
|
|
write_lock_bh(&list->lock);
|
|
|
|
/* Check if we already have channel with that dcid */
|
|
if (__l2cap_get_chan_by_dcid(list, scid)) {
|
|
write_unlock_bh(&list->lock);
|
|
sock_set_flag(sk, SOCK_ZAPPED);
|
|
l2cap_sock_kill(sk);
|
|
goto response;
|
|
}
|
|
|
|
hci_conn_hold(conn->hcon);
|
|
|
|
l2cap_sock_init(sk, parent);
|
|
bacpy(&bt_sk(sk)->src, conn->src);
|
|
bacpy(&bt_sk(sk)->dst, conn->dst);
|
|
l2cap_pi(sk)->psm = psm;
|
|
l2cap_pi(sk)->dcid = scid;
|
|
|
|
__l2cap_chan_add(conn, sk, parent);
|
|
dcid = l2cap_pi(sk)->scid;
|
|
|
|
l2cap_sock_set_timer(sk, sk->sk_sndtimeo);
|
|
|
|
l2cap_pi(sk)->ident = cmd->ident;
|
|
|
|
if (conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_DONE) {
|
|
if (l2cap_check_security(sk)) {
|
|
if (bt_sk(sk)->defer_setup) {
|
|
sk->sk_state = BT_CONNECT2;
|
|
result = L2CAP_CR_PEND;
|
|
status = L2CAP_CS_AUTHOR_PEND;
|
|
parent->sk_data_ready(parent, 0);
|
|
} else {
|
|
sk->sk_state = BT_CONFIG;
|
|
result = L2CAP_CR_SUCCESS;
|
|
status = L2CAP_CS_NO_INFO;
|
|
}
|
|
} else {
|
|
sk->sk_state = BT_CONNECT2;
|
|
result = L2CAP_CR_PEND;
|
|
status = L2CAP_CS_AUTHEN_PEND;
|
|
}
|
|
} else {
|
|
sk->sk_state = BT_CONNECT2;
|
|
result = L2CAP_CR_PEND;
|
|
status = L2CAP_CS_NO_INFO;
|
|
}
|
|
|
|
write_unlock_bh(&list->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);
|
|
}
|
|
|
|
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 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) {
|
|
sk = l2cap_get_chan_by_scid(&conn->chan_list, scid);
|
|
if (!sk)
|
|
return 0;
|
|
} else {
|
|
sk = l2cap_get_chan_by_ident(&conn->chan_list, cmd->ident);
|
|
if (!sk)
|
|
return 0;
|
|
}
|
|
|
|
switch (result) {
|
|
case L2CAP_CR_SUCCESS:
|
|
sk->sk_state = BT_CONFIG;
|
|
l2cap_pi(sk)->ident = 0;
|
|
l2cap_pi(sk)->dcid = dcid;
|
|
l2cap_pi(sk)->conf_state |= L2CAP_CONF_REQ_SENT;
|
|
|
|
l2cap_pi(sk)->conf_state &= ~L2CAP_CONF_CONNECT_PEND;
|
|
|
|
l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ,
|
|
l2cap_build_conf_req(sk, req), req);
|
|
l2cap_pi(sk)->num_conf_req++;
|
|
break;
|
|
|
|
case L2CAP_CR_PEND:
|
|
l2cap_pi(sk)->conf_state |= L2CAP_CONF_CONNECT_PEND;
|
|
break;
|
|
|
|
default:
|
|
l2cap_chan_del(sk, ECONNREFUSED);
|
|
break;
|
|
}
|
|
|
|
bh_unlock_sock(sk);
|
|
return 0;
|
|
}
|
|
|
|
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 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);
|
|
|
|
sk = l2cap_get_chan_by_scid(&conn->chan_list, dcid);
|
|
if (!sk)
|
|
return -ENOENT;
|
|
|
|
if (sk->sk_state == BT_DISCONN)
|
|
goto unlock;
|
|
|
|
/* Reject if config buffer is too small. */
|
|
len = cmd_len - sizeof(*req);
|
|
if (l2cap_pi(sk)->conf_len + len > sizeof(l2cap_pi(sk)->conf_req)) {
|
|
l2cap_send_cmd(conn, cmd->ident, L2CAP_CONF_RSP,
|
|
l2cap_build_conf_rsp(sk, rsp,
|
|
L2CAP_CONF_REJECT, flags), rsp);
|
|
goto unlock;
|
|
}
|
|
|
|
/* Store config. */
|
|
memcpy(l2cap_pi(sk)->conf_req + l2cap_pi(sk)->conf_len, req->data, len);
|
|
l2cap_pi(sk)->conf_len += len;
|
|
|
|
if (flags & 0x0001) {
|
|
/* Incomplete config. Send empty response. */
|
|
l2cap_send_cmd(conn, cmd->ident, L2CAP_CONF_RSP,
|
|
l2cap_build_conf_rsp(sk, rsp,
|
|
L2CAP_CONF_SUCCESS, 0x0001), rsp);
|
|
goto unlock;
|
|
}
|
|
|
|
/* Complete config. */
|
|
len = l2cap_parse_conf_req(sk, rsp);
|
|
if (len < 0) {
|
|
l2cap_send_disconn_req(conn, sk);
|
|
goto unlock;
|
|
}
|
|
|
|
l2cap_send_cmd(conn, cmd->ident, L2CAP_CONF_RSP, len, rsp);
|
|
l2cap_pi(sk)->num_conf_rsp++;
|
|
|
|
/* Reset config buffer. */
|
|
l2cap_pi(sk)->conf_len = 0;
|
|
|
|
if (!(l2cap_pi(sk)->conf_state & L2CAP_CONF_OUTPUT_DONE))
|
|
goto unlock;
|
|
|
|
if (l2cap_pi(sk)->conf_state & L2CAP_CONF_INPUT_DONE) {
|
|
if (!(l2cap_pi(sk)->conf_state & L2CAP_CONF_NO_FCS_RECV) ||
|
|
l2cap_pi(sk)->fcs != L2CAP_FCS_NONE)
|
|
l2cap_pi(sk)->fcs = L2CAP_FCS_CRC16;
|
|
|
|
sk->sk_state = BT_CONNECTED;
|
|
|
|
l2cap_pi(sk)->next_tx_seq = 0;
|
|
l2cap_pi(sk)->expected_tx_seq = 0;
|
|
__skb_queue_head_init(TX_QUEUE(sk));
|
|
if (l2cap_pi(sk)->mode == L2CAP_MODE_ERTM)
|
|
l2cap_ertm_init(sk);
|
|
|
|
l2cap_chan_ready(sk);
|
|
goto unlock;
|
|
}
|
|
|
|
if (!(l2cap_pi(sk)->conf_state & L2CAP_CONF_REQ_SENT)) {
|
|
u8 buf[64];
|
|
l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ,
|
|
l2cap_build_conf_req(sk, buf), buf);
|
|
l2cap_pi(sk)->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 sock *sk;
|
|
|
|
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);
|
|
|
|
sk = l2cap_get_chan_by_scid(&conn->chan_list, scid);
|
|
if (!sk)
|
|
return 0;
|
|
|
|
switch (result) {
|
|
case L2CAP_CONF_SUCCESS:
|
|
break;
|
|
|
|
case L2CAP_CONF_UNACCEPT:
|
|
if (l2cap_pi(sk)->num_conf_rsp <= L2CAP_CONF_MAX_CONF_RSP) {
|
|
int len = cmd->len - sizeof(*rsp);
|
|
char req[64];
|
|
|
|
/* throw out any old stored conf requests */
|
|
result = L2CAP_CONF_SUCCESS;
|
|
len = l2cap_parse_conf_rsp(sk, rsp->data,
|
|
len, req, &result);
|
|
if (len < 0) {
|
|
l2cap_send_disconn_req(conn, sk);
|
|
goto done;
|
|
}
|
|
|
|
l2cap_send_cmd(conn, l2cap_get_ident(conn),
|
|
L2CAP_CONF_REQ, len, req);
|
|
l2cap_pi(sk)->num_conf_req++;
|
|
if (result != L2CAP_CONF_SUCCESS)
|
|
goto done;
|
|
break;
|
|
}
|
|
|
|
default:
|
|
sk->sk_state = BT_DISCONN;
|
|
sk->sk_err = ECONNRESET;
|
|
l2cap_sock_set_timer(sk, HZ * 5);
|
|
l2cap_send_disconn_req(conn, sk);
|
|
goto done;
|
|
}
|
|
|
|
if (flags & 0x01)
|
|
goto done;
|
|
|
|
l2cap_pi(sk)->conf_state |= L2CAP_CONF_INPUT_DONE;
|
|
|
|
if (l2cap_pi(sk)->conf_state & L2CAP_CONF_OUTPUT_DONE) {
|
|
if (!(l2cap_pi(sk)->conf_state & L2CAP_CONF_NO_FCS_RECV) ||
|
|
l2cap_pi(sk)->fcs != L2CAP_FCS_NONE)
|
|
l2cap_pi(sk)->fcs = L2CAP_FCS_CRC16;
|
|
|
|
sk->sk_state = BT_CONNECTED;
|
|
l2cap_pi(sk)->next_tx_seq = 0;
|
|
l2cap_pi(sk)->expected_tx_seq = 0;
|
|
__skb_queue_head_init(TX_QUEUE(sk));
|
|
if (l2cap_pi(sk)->mode == L2CAP_MODE_ERTM)
|
|
l2cap_ertm_init(sk);
|
|
|
|
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 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);
|
|
|
|
sk = l2cap_get_chan_by_scid(&conn->chan_list, dcid);
|
|
if (!sk)
|
|
return 0;
|
|
|
|
rsp.dcid = cpu_to_le16(l2cap_pi(sk)->scid);
|
|
rsp.scid = cpu_to_le16(l2cap_pi(sk)->dcid);
|
|
l2cap_send_cmd(conn, cmd->ident, L2CAP_DISCONN_RSP, sizeof(rsp), &rsp);
|
|
|
|
sk->sk_shutdown = SHUTDOWN_MASK;
|
|
|
|
skb_queue_purge(TX_QUEUE(sk));
|
|
|
|
if (l2cap_pi(sk)->mode == L2CAP_MODE_ERTM) {
|
|
skb_queue_purge(SREJ_QUEUE(sk));
|
|
del_timer(&l2cap_pi(sk)->retrans_timer);
|
|
del_timer(&l2cap_pi(sk)->monitor_timer);
|
|
}
|
|
|
|
l2cap_chan_del(sk, ECONNRESET);
|
|
bh_unlock_sock(sk);
|
|
|
|
l2cap_sock_kill(sk);
|
|
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 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);
|
|
|
|
sk = l2cap_get_chan_by_scid(&conn->chan_list, scid);
|
|
if (!sk)
|
|
return 0;
|
|
|
|
skb_queue_purge(TX_QUEUE(sk));
|
|
|
|
if (l2cap_pi(sk)->mode == L2CAP_MODE_ERTM) {
|
|
skb_queue_purge(SREJ_QUEUE(sk));
|
|
del_timer(&l2cap_pi(sk)->retrans_timer);
|
|
del_timer(&l2cap_pi(sk)->monitor_timer);
|
|
}
|
|
|
|
l2cap_chan_del(sk, 0);
|
|
bh_unlock_sock(sk);
|
|
|
|
l2cap_sock_kill(sk);
|
|
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 (enable_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);
|
|
|
|
del_timer(&conn->info_timer);
|
|
|
|
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 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 = 0;
|
|
|
|
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;
|
|
}
|
|
|
|
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 signaling command 0x%2.2x", cmd.code);
|
|
err = -EINVAL;
|
|
break;
|
|
}
|
|
|
|
if (err) {
|
|
struct l2cap_cmd_rej rej;
|
|
BT_DBG("error %d", err);
|
|
|
|
/* FIXME: Map err to a valid reason */
|
|
rej.reason = cpu_to_le16(0);
|
|
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_pinfo *pi, struct sk_buff *skb)
|
|
{
|
|
u16 our_fcs, rcv_fcs;
|
|
int hdr_size = L2CAP_HDR_SIZE + 2;
|
|
|
|
if (pi->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 -EINVAL;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static void l2cap_add_to_srej_queue(struct sock *sk, struct sk_buff *skb, u8 tx_seq, u8 sar)
|
|
{
|
|
struct sk_buff *next_skb;
|
|
|
|
bt_cb(skb)->tx_seq = tx_seq;
|
|
bt_cb(skb)->sar = sar;
|
|
|
|
next_skb = skb_peek(SREJ_QUEUE(sk));
|
|
if (!next_skb) {
|
|
__skb_queue_tail(SREJ_QUEUE(sk), skb);
|
|
return;
|
|
}
|
|
|
|
do {
|
|
if (bt_cb(next_skb)->tx_seq > tx_seq) {
|
|
__skb_queue_before(SREJ_QUEUE(sk), next_skb, skb);
|
|
return;
|
|
}
|
|
|
|
if (skb_queue_is_last(SREJ_QUEUE(sk), next_skb))
|
|
break;
|
|
|
|
} while((next_skb = skb_queue_next(SREJ_QUEUE(sk), next_skb)));
|
|
|
|
__skb_queue_tail(SREJ_QUEUE(sk), skb);
|
|
}
|
|
|
|
static int l2cap_sar_reassembly_sdu(struct sock *sk, struct sk_buff *skb, u16 control)
|
|
{
|
|
struct l2cap_pinfo *pi = l2cap_pi(sk);
|
|
struct sk_buff *_skb;
|
|
int err = -EINVAL;
|
|
|
|
switch (control & L2CAP_CTRL_SAR) {
|
|
case L2CAP_SDU_UNSEGMENTED:
|
|
if (pi->conn_state & L2CAP_CONN_SAR_SDU) {
|
|
kfree_skb(pi->sdu);
|
|
break;
|
|
}
|
|
|
|
err = sock_queue_rcv_skb(sk, skb);
|
|
if (!err)
|
|
return 0;
|
|
|
|
break;
|
|
|
|
case L2CAP_SDU_START:
|
|
if (pi->conn_state & L2CAP_CONN_SAR_SDU) {
|
|
kfree_skb(pi->sdu);
|
|
break;
|
|
}
|
|
|
|
pi->sdu_len = get_unaligned_le16(skb->data);
|
|
skb_pull(skb, 2);
|
|
|
|
pi->sdu = bt_skb_alloc(pi->sdu_len, GFP_ATOMIC);
|
|
if (!pi->sdu) {
|
|
err = -ENOMEM;
|
|
break;
|
|
}
|
|
|
|
memcpy(skb_put(pi->sdu, skb->len), skb->data, skb->len);
|
|
|
|
pi->conn_state |= L2CAP_CONN_SAR_SDU;
|
|
pi->partial_sdu_len = skb->len;
|
|
err = 0;
|
|
break;
|
|
|
|
case L2CAP_SDU_CONTINUE:
|
|
if (!(pi->conn_state & L2CAP_CONN_SAR_SDU))
|
|
break;
|
|
|
|
memcpy(skb_put(pi->sdu, skb->len), skb->data, skb->len);
|
|
|
|
pi->partial_sdu_len += skb->len;
|
|
if (pi->partial_sdu_len > pi->sdu_len)
|
|
kfree_skb(pi->sdu);
|
|
else
|
|
err = 0;
|
|
|
|
break;
|
|
|
|
case L2CAP_SDU_END:
|
|
if (!(pi->conn_state & L2CAP_CONN_SAR_SDU))
|
|
break;
|
|
|
|
memcpy(skb_put(pi->sdu, skb->len), skb->data, skb->len);
|
|
|
|
pi->conn_state &= ~L2CAP_CONN_SAR_SDU;
|
|
pi->partial_sdu_len += skb->len;
|
|
|
|
if (pi->partial_sdu_len == pi->sdu_len) {
|
|
_skb = skb_clone(pi->sdu, GFP_ATOMIC);
|
|
err = sock_queue_rcv_skb(sk, _skb);
|
|
if (err < 0)
|
|
kfree_skb(_skb);
|
|
}
|
|
kfree_skb(pi->sdu);
|
|
err = 0;
|
|
|
|
break;
|
|
}
|
|
|
|
kfree_skb(skb);
|
|
return err;
|
|
}
|
|
|
|
static void l2cap_check_srej_gap(struct sock *sk, u8 tx_seq)
|
|
{
|
|
struct sk_buff *skb;
|
|
u16 control = 0;
|
|
|
|
while((skb = skb_peek(SREJ_QUEUE(sk)))) {
|
|
if (bt_cb(skb)->tx_seq != tx_seq)
|
|
break;
|
|
|
|
skb = skb_dequeue(SREJ_QUEUE(sk));
|
|
control |= bt_cb(skb)->sar << L2CAP_CTRL_SAR_SHIFT;
|
|
l2cap_sar_reassembly_sdu(sk, skb, control);
|
|
l2cap_pi(sk)->buffer_seq_srej =
|
|
(l2cap_pi(sk)->buffer_seq_srej + 1) % 64;
|
|
tx_seq++;
|
|
}
|
|
}
|
|
|
|
static void l2cap_resend_srejframe(struct sock *sk, u8 tx_seq)
|
|
{
|
|
struct l2cap_pinfo *pi = l2cap_pi(sk);
|
|
struct srej_list *l, *tmp;
|
|
u16 control;
|
|
|
|
list_for_each_entry_safe(l,tmp, SREJ_LIST(sk), 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(pi, control);
|
|
list_del(&l->list);
|
|
list_add_tail(&l->list, SREJ_LIST(sk));
|
|
}
|
|
}
|
|
|
|
static void l2cap_send_srejframe(struct sock *sk, u8 tx_seq)
|
|
{
|
|
struct l2cap_pinfo *pi = l2cap_pi(sk);
|
|
struct srej_list *new;
|
|
u16 control;
|
|
|
|
while (tx_seq != pi->expected_tx_seq) {
|
|
control = L2CAP_SUPER_SELECT_REJECT;
|
|
control |= pi->expected_tx_seq << L2CAP_CTRL_REQSEQ_SHIFT;
|
|
if (pi->conn_state & L2CAP_CONN_SEND_PBIT) {
|
|
control |= L2CAP_CTRL_POLL;
|
|
pi->conn_state &= ~L2CAP_CONN_SEND_PBIT;
|
|
}
|
|
l2cap_send_sframe(pi, control);
|
|
|
|
new = kzalloc(sizeof(struct srej_list), GFP_ATOMIC);
|
|
new->tx_seq = pi->expected_tx_seq++;
|
|
list_add_tail(&new->list, SREJ_LIST(sk));
|
|
}
|
|
pi->expected_tx_seq++;
|
|
}
|
|
|
|
static inline int l2cap_data_channel_iframe(struct sock *sk, u16 rx_control, struct sk_buff *skb)
|
|
{
|
|
struct l2cap_pinfo *pi = l2cap_pi(sk);
|
|
u8 tx_seq = __get_txseq(rx_control);
|
|
u16 tx_control = 0;
|
|
u8 sar = rx_control >> L2CAP_CTRL_SAR_SHIFT;
|
|
int err = 0;
|
|
|
|
BT_DBG("sk %p rx_control 0x%4.4x len %d", sk, rx_control, skb->len);
|
|
|
|
if (tx_seq == pi->expected_tx_seq)
|
|
goto expected;
|
|
|
|
if (pi->conn_state & L2CAP_CONN_SREJ_SENT) {
|
|
struct srej_list *first;
|
|
|
|
first = list_first_entry(SREJ_LIST(sk),
|
|
struct srej_list, list);
|
|
if (tx_seq == first->tx_seq) {
|
|
l2cap_add_to_srej_queue(sk, skb, tx_seq, sar);
|
|
l2cap_check_srej_gap(sk, tx_seq);
|
|
|
|
list_del(&first->list);
|
|
kfree(first);
|
|
|
|
if (list_empty(SREJ_LIST(sk))) {
|
|
pi->buffer_seq = pi->buffer_seq_srej;
|
|
pi->conn_state &= ~L2CAP_CONN_SREJ_SENT;
|
|
}
|
|
} else {
|
|
struct srej_list *l;
|
|
l2cap_add_to_srej_queue(sk, skb, tx_seq, sar);
|
|
|
|
list_for_each_entry(l, SREJ_LIST(sk), list) {
|
|
if (l->tx_seq == tx_seq) {
|
|
l2cap_resend_srejframe(sk, tx_seq);
|
|
return 0;
|
|
}
|
|
}
|
|
l2cap_send_srejframe(sk, tx_seq);
|
|
}
|
|
} else {
|
|
pi->conn_state |= L2CAP_CONN_SREJ_SENT;
|
|
|
|
INIT_LIST_HEAD(SREJ_LIST(sk));
|
|
pi->buffer_seq_srej = pi->buffer_seq;
|
|
|
|
__skb_queue_head_init(SREJ_QUEUE(sk));
|
|
l2cap_add_to_srej_queue(sk, skb, tx_seq, sar);
|
|
|
|
pi->conn_state |= L2CAP_CONN_SEND_PBIT;
|
|
|
|
l2cap_send_srejframe(sk, tx_seq);
|
|
}
|
|
return 0;
|
|
|
|
expected:
|
|
pi->expected_tx_seq = (pi->expected_tx_seq + 1) % 64;
|
|
|
|
if (pi->conn_state & L2CAP_CONN_SREJ_SENT) {
|
|
l2cap_add_to_srej_queue(sk, skb, tx_seq, sar);
|
|
return 0;
|
|
}
|
|
|
|
pi->buffer_seq = (pi->buffer_seq + 1) % 64;
|
|
|
|
err = l2cap_sar_reassembly_sdu(sk, skb, rx_control);
|
|
if (err < 0)
|
|
return err;
|
|
|
|
pi->num_to_ack = (pi->num_to_ack + 1) % L2CAP_DEFAULT_NUM_TO_ACK;
|
|
if (pi->num_to_ack == L2CAP_DEFAULT_NUM_TO_ACK - 1) {
|
|
tx_control |= L2CAP_SUPER_RCV_READY;
|
|
tx_control |= pi->buffer_seq << L2CAP_CTRL_REQSEQ_SHIFT;
|
|
l2cap_send_sframe(pi, tx_control);
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static inline int l2cap_data_channel_sframe(struct sock *sk, u16 rx_control, struct sk_buff *skb)
|
|
{
|
|
struct l2cap_pinfo *pi = l2cap_pi(sk);
|
|
u8 tx_seq = __get_reqseq(rx_control);
|
|
|
|
BT_DBG("sk %p rx_control 0x%4.4x len %d", sk, rx_control, skb->len);
|
|
|
|
switch (rx_control & L2CAP_CTRL_SUPERVISE) {
|
|
case L2CAP_SUPER_RCV_READY:
|
|
if (rx_control & L2CAP_CTRL_POLL) {
|
|
u16 control = L2CAP_CTRL_FINAL;
|
|
control |= L2CAP_SUPER_RCV_READY |
|
|
(pi->buffer_seq << L2CAP_CTRL_REQSEQ_SHIFT);
|
|
l2cap_send_sframe(l2cap_pi(sk), control);
|
|
pi->conn_state &= ~L2CAP_CONN_REMOTE_BUSY;
|
|
|
|
} else if (rx_control & L2CAP_CTRL_FINAL) {
|
|
pi->conn_state &= ~L2CAP_CONN_REMOTE_BUSY;
|
|
pi->expected_ack_seq = tx_seq;
|
|
l2cap_drop_acked_frames(sk);
|
|
|
|
if (!(pi->conn_state & L2CAP_CONN_WAIT_F))
|
|
break;
|
|
|
|
pi->conn_state &= ~L2CAP_CONN_WAIT_F;
|
|
del_timer(&pi->monitor_timer);
|
|
|
|
if (pi->unacked_frames > 0)
|
|
__mod_retrans_timer();
|
|
} else {
|
|
pi->expected_ack_seq = tx_seq;
|
|
l2cap_drop_acked_frames(sk);
|
|
|
|
if ((pi->conn_state & L2CAP_CONN_REMOTE_BUSY) &&
|
|
(pi->unacked_frames > 0))
|
|
__mod_retrans_timer();
|
|
|
|
l2cap_ertm_send(sk);
|
|
pi->conn_state &= ~L2CAP_CONN_REMOTE_BUSY;
|
|
}
|
|
break;
|
|
|
|
case L2CAP_SUPER_REJECT:
|
|
pi->conn_state &= ~L2CAP_CONN_REMOTE_BUSY;
|
|
|
|
pi->expected_ack_seq = __get_reqseq(rx_control);
|
|
l2cap_drop_acked_frames(sk);
|
|
|
|
sk->sk_send_head = TX_QUEUE(sk)->next;
|
|
pi->next_tx_seq = pi->expected_ack_seq;
|
|
|
|
l2cap_ertm_send(sk);
|
|
|
|
break;
|
|
|
|
case L2CAP_SUPER_SELECT_REJECT:
|
|
pi->conn_state &= ~L2CAP_CONN_REMOTE_BUSY;
|
|
|
|
if (rx_control & L2CAP_CTRL_POLL) {
|
|
l2cap_retransmit_frame(sk, tx_seq);
|
|
pi->expected_ack_seq = tx_seq;
|
|
l2cap_drop_acked_frames(sk);
|
|
l2cap_ertm_send(sk);
|
|
if (pi->conn_state & L2CAP_CONN_WAIT_F) {
|
|
pi->srej_save_reqseq = tx_seq;
|
|
pi->conn_state |= L2CAP_CONN_SREJ_ACT;
|
|
}
|
|
} else if (rx_control & L2CAP_CTRL_FINAL) {
|
|
if ((pi->conn_state & L2CAP_CONN_SREJ_ACT) &&
|
|
pi->srej_save_reqseq == tx_seq)
|
|
pi->conn_state &= ~L2CAP_CONN_SREJ_ACT;
|
|
else
|
|
l2cap_retransmit_frame(sk, tx_seq);
|
|
}
|
|
else {
|
|
l2cap_retransmit_frame(sk, tx_seq);
|
|
if (pi->conn_state & L2CAP_CONN_WAIT_F) {
|
|
pi->srej_save_reqseq = tx_seq;
|
|
pi->conn_state |= L2CAP_CONN_SREJ_ACT;
|
|
}
|
|
}
|
|
break;
|
|
|
|
case L2CAP_SUPER_RCV_NOT_READY:
|
|
pi->conn_state |= L2CAP_CONN_REMOTE_BUSY;
|
|
pi->expected_ack_seq = tx_seq;
|
|
l2cap_drop_acked_frames(sk);
|
|
|
|
del_timer(&l2cap_pi(sk)->retrans_timer);
|
|
if (rx_control & L2CAP_CTRL_POLL) {
|
|
u16 control = L2CAP_CTRL_FINAL;
|
|
l2cap_send_rr_or_rnr(l2cap_pi(sk), control);
|
|
}
|
|
break;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static inline int l2cap_data_channel(struct l2cap_conn *conn, u16 cid, struct sk_buff *skb)
|
|
{
|
|
struct sock *sk;
|
|
struct l2cap_pinfo *pi;
|
|
u16 control, len;
|
|
u8 tx_seq;
|
|
int err;
|
|
|
|
sk = l2cap_get_chan_by_scid(&conn->chan_list, cid);
|
|
if (!sk) {
|
|
BT_DBG("unknown cid 0x%4.4x", cid);
|
|
goto drop;
|
|
}
|
|
|
|
pi = l2cap_pi(sk);
|
|
|
|
BT_DBG("sk %p, len %d", sk, skb->len);
|
|
|
|
if (sk->sk_state != BT_CONNECTED)
|
|
goto drop;
|
|
|
|
switch (pi->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 (pi->imtu < skb->len)
|
|
goto drop;
|
|
|
|
if (!sock_queue_rcv_skb(sk, skb))
|
|
goto done;
|
|
break;
|
|
|
|
case L2CAP_MODE_ERTM:
|
|
control = get_unaligned_le16(skb->data);
|
|
skb_pull(skb, 2);
|
|
len = skb->len;
|
|
|
|
if (__is_sar_start(control))
|
|
len -= 2;
|
|
|
|
if (pi->fcs == L2CAP_FCS_CRC16)
|
|
len -= 2;
|
|
|
|
/*
|
|
* We can just drop the corrupted I-frame here.
|
|
* Receiver will miss it and start proper recovery
|
|
* procedures and ask retransmission.
|
|
*/
|
|
if (len > L2CAP_DEFAULT_MAX_PDU_SIZE)
|
|
goto drop;
|
|
|
|
if (l2cap_check_fcs(pi, skb))
|
|
goto drop;
|
|
|
|
if (__is_iframe(control))
|
|
err = l2cap_data_channel_iframe(sk, control, skb);
|
|
else
|
|
err = l2cap_data_channel_sframe(sk, control, skb);
|
|
|
|
if (!err)
|
|
goto done;
|
|
break;
|
|
|
|
case L2CAP_MODE_STREAMING:
|
|
control = get_unaligned_le16(skb->data);
|
|
skb_pull(skb, 2);
|
|
len = skb->len;
|
|
|
|
if (__is_sar_start(control))
|
|
len -= 2;
|
|
|
|
if (pi->fcs == L2CAP_FCS_CRC16)
|
|
len -= 2;
|
|
|
|
if (len > L2CAP_DEFAULT_MAX_PDU_SIZE || __is_sframe(control))
|
|
goto drop;
|
|
|
|
if (l2cap_check_fcs(pi, skb))
|
|
goto drop;
|
|
|
|
tx_seq = __get_txseq(control);
|
|
|
|
if (pi->expected_tx_seq == tx_seq)
|
|
pi->expected_tx_seq = (pi->expected_tx_seq + 1) % 64;
|
|
else
|
|
pi->expected_tx_seq = tx_seq + 1;
|
|
|
|
err = l2cap_sar_reassembly_sdu(sk, skb, control);
|
|
|
|
goto done;
|
|
|
|
default:
|
|
BT_DBG("sk %p: bad mode 0x%2.2x", sk, l2cap_pi(sk)->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;
|
|
|
|
sk = l2cap_get_sock_by_psm(0, psm, conn->src);
|
|
if (!sk)
|
|
goto drop;
|
|
|
|
BT_DBG("sk %p, len %d", sk, skb->len);
|
|
|
|
if (sk->sk_state != BT_BOUND && sk->sk_state != BT_CONNECTED)
|
|
goto drop;
|
|
|
|
if (l2cap_pi(sk)->imtu < skb->len)
|
|
goto drop;
|
|
|
|
if (!sock_queue_rcv_skb(sk, 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_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;
|
|
|
|
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;
|
|
register struct sock *sk;
|
|
struct hlist_node *node;
|
|
|
|
if (type != ACL_LINK)
|
|
return 0;
|
|
|
|
BT_DBG("hdev %s, bdaddr %s", hdev->name, batostr(bdaddr));
|
|
|
|
/* Find listening sockets and check their link_mode */
|
|
read_lock(&l2cap_sk_list.lock);
|
|
sk_for_each(sk, node, &l2cap_sk_list.head) {
|
|
if (sk->sk_state != BT_LISTEN)
|
|
continue;
|
|
|
|
if (!bacmp(&bt_sk(sk)->src, &hdev->bdaddr)) {
|
|
lm1 |= HCI_LM_ACCEPT;
|
|
if (l2cap_pi(sk)->role_switch)
|
|
lm1 |= HCI_LM_MASTER;
|
|
exact++;
|
|
} else if (!bacmp(&bt_sk(sk)->src, BDADDR_ANY)) {
|
|
lm2 |= HCI_LM_ACCEPT;
|
|
if (l2cap_pi(sk)->role_switch)
|
|
lm2 |= HCI_LM_MASTER;
|
|
}
|
|
}
|
|
read_unlock(&l2cap_sk_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)
|
|
return 0;
|
|
|
|
if (!status) {
|
|
conn = l2cap_conn_add(hcon, status);
|
|
if (conn)
|
|
l2cap_conn_ready(conn);
|
|
} else
|
|
l2cap_conn_del(hcon, bt_err(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 || !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)
|
|
return 0;
|
|
|
|
l2cap_conn_del(hcon, bt_err(reason));
|
|
|
|
return 0;
|
|
}
|
|
|
|
static inline void l2cap_check_encryption(struct sock *sk, u8 encrypt)
|
|
{
|
|
if (sk->sk_type != SOCK_SEQPACKET)
|
|
return;
|
|
|
|
if (encrypt == 0x00) {
|
|
if (l2cap_pi(sk)->sec_level == BT_SECURITY_MEDIUM) {
|
|
l2cap_sock_clear_timer(sk);
|
|
l2cap_sock_set_timer(sk, HZ * 5);
|
|
} else if (l2cap_pi(sk)->sec_level == BT_SECURITY_HIGH)
|
|
__l2cap_sock_close(sk, ECONNREFUSED);
|
|
} else {
|
|
if (l2cap_pi(sk)->sec_level == BT_SECURITY_MEDIUM)
|
|
l2cap_sock_clear_timer(sk);
|
|
}
|
|
}
|
|
|
|
static int l2cap_security_cfm(struct hci_conn *hcon, u8 status, u8 encrypt)
|
|
{
|
|
struct l2cap_chan_list *l;
|
|
struct l2cap_conn *conn = hcon->l2cap_data;
|
|
struct sock *sk;
|
|
|
|
if (!conn)
|
|
return 0;
|
|
|
|
l = &conn->chan_list;
|
|
|
|
BT_DBG("conn %p", conn);
|
|
|
|
read_lock(&l->lock);
|
|
|
|
for (sk = l->head; sk; sk = l2cap_pi(sk)->next_c) {
|
|
bh_lock_sock(sk);
|
|
|
|
if (l2cap_pi(sk)->conf_state & L2CAP_CONF_CONNECT_PEND) {
|
|
bh_unlock_sock(sk);
|
|
continue;
|
|
}
|
|
|
|
if (!status && (sk->sk_state == BT_CONNECTED ||
|
|
sk->sk_state == BT_CONFIG)) {
|
|
l2cap_check_encryption(sk, encrypt);
|
|
bh_unlock_sock(sk);
|
|
continue;
|
|
}
|
|
|
|
if (sk->sk_state == BT_CONNECT) {
|
|
if (!status) {
|
|
struct l2cap_conn_req req;
|
|
req.scid = cpu_to_le16(l2cap_pi(sk)->scid);
|
|
req.psm = l2cap_pi(sk)->psm;
|
|
|
|
l2cap_pi(sk)->ident = l2cap_get_ident(conn);
|
|
|
|
l2cap_send_cmd(conn, l2cap_pi(sk)->ident,
|
|
L2CAP_CONN_REQ, sizeof(req), &req);
|
|
} else {
|
|
l2cap_sock_clear_timer(sk);
|
|
l2cap_sock_set_timer(sk, HZ / 10);
|
|
}
|
|
} else if (sk->sk_state == BT_CONNECT2) {
|
|
struct l2cap_conn_rsp rsp;
|
|
__u16 result;
|
|
|
|
if (!status) {
|
|
sk->sk_state = BT_CONFIG;
|
|
result = L2CAP_CR_SUCCESS;
|
|
} else {
|
|
sk->sk_state = BT_DISCONN;
|
|
l2cap_sock_set_timer(sk, HZ / 10);
|
|
result = L2CAP_CR_SEC_BLOCK;
|
|
}
|
|
|
|
rsp.scid = cpu_to_le16(l2cap_pi(sk)->dcid);
|
|
rsp.dcid = cpu_to_le16(l2cap_pi(sk)->scid);
|
|
rsp.result = cpu_to_le16(result);
|
|
rsp.status = cpu_to_le16(L2CAP_CS_NO_INFO);
|
|
l2cap_send_cmd(conn, l2cap_pi(sk)->ident,
|
|
L2CAP_CONN_RSP, sizeof(rsp), &rsp);
|
|
}
|
|
|
|
bh_unlock_sock(sk);
|
|
}
|
|
|
|
read_unlock(&l->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)))
|
|
goto drop;
|
|
|
|
BT_DBG("conn %p len %d flags 0x%x", conn, skb->len, flags);
|
|
|
|
if (flags & ACL_START) {
|
|
struct l2cap_hdr *hdr;
|
|
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);
|
|
}
|
|
|
|
if (skb->len < 2) {
|
|
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;
|
|
|
|
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;
|
|
}
|
|
|
|
/* 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 ssize_t l2cap_sysfs_show(struct class *dev, char *buf)
|
|
{
|
|
struct sock *sk;
|
|
struct hlist_node *node;
|
|
char *str = buf;
|
|
|
|
read_lock_bh(&l2cap_sk_list.lock);
|
|
|
|
sk_for_each(sk, node, &l2cap_sk_list.head) {
|
|
struct l2cap_pinfo *pi = l2cap_pi(sk);
|
|
|
|
str += sprintf(str, "%s %s %d %d 0x%4.4x 0x%4.4x %d %d %d\n",
|
|
batostr(&bt_sk(sk)->src), batostr(&bt_sk(sk)->dst),
|
|
sk->sk_state, __le16_to_cpu(pi->psm), pi->scid,
|
|
pi->dcid, pi->imtu, pi->omtu, pi->sec_level);
|
|
}
|
|
|
|
read_unlock_bh(&l2cap_sk_list.lock);
|
|
|
|
return str - buf;
|
|
}
|
|
|
|
static CLASS_ATTR(l2cap, S_IRUGO, l2cap_sysfs_show, NULL);
|
|
|
|
static const struct proto_ops l2cap_sock_ops = {
|
|
.family = PF_BLUETOOTH,
|
|
.owner = THIS_MODULE,
|
|
.release = l2cap_sock_release,
|
|
.bind = l2cap_sock_bind,
|
|
.connect = l2cap_sock_connect,
|
|
.listen = l2cap_sock_listen,
|
|
.accept = l2cap_sock_accept,
|
|
.getname = l2cap_sock_getname,
|
|
.sendmsg = l2cap_sock_sendmsg,
|
|
.recvmsg = l2cap_sock_recvmsg,
|
|
.poll = bt_sock_poll,
|
|
.ioctl = bt_sock_ioctl,
|
|
.mmap = sock_no_mmap,
|
|
.socketpair = sock_no_socketpair,
|
|
.shutdown = l2cap_sock_shutdown,
|
|
.setsockopt = l2cap_sock_setsockopt,
|
|
.getsockopt = l2cap_sock_getsockopt
|
|
};
|
|
|
|
static const struct net_proto_family l2cap_sock_family_ops = {
|
|
.family = PF_BLUETOOTH,
|
|
.owner = THIS_MODULE,
|
|
.create = l2cap_sock_create,
|
|
};
|
|
|
|
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
|
|
};
|
|
|
|
static int __init l2cap_init(void)
|
|
{
|
|
int err;
|
|
|
|
err = proto_register(&l2cap_proto, 0);
|
|
if (err < 0)
|
|
return err;
|
|
|
|
err = bt_sock_register(BTPROTO_L2CAP, &l2cap_sock_family_ops);
|
|
if (err < 0) {
|
|
BT_ERR("L2CAP socket registration failed");
|
|
goto error;
|
|
}
|
|
|
|
err = hci_register_proto(&l2cap_hci_proto);
|
|
if (err < 0) {
|
|
BT_ERR("L2CAP protocol registration failed");
|
|
bt_sock_unregister(BTPROTO_L2CAP);
|
|
goto error;
|
|
}
|
|
|
|
if (class_create_file(bt_class, &class_attr_l2cap) < 0)
|
|
BT_ERR("Failed to create L2CAP info file");
|
|
|
|
BT_INFO("L2CAP ver %s", VERSION);
|
|
BT_INFO("L2CAP socket layer initialized");
|
|
|
|
return 0;
|
|
|
|
error:
|
|
proto_unregister(&l2cap_proto);
|
|
return err;
|
|
}
|
|
|
|
static void __exit l2cap_exit(void)
|
|
{
|
|
class_remove_file(bt_class, &class_attr_l2cap);
|
|
|
|
if (bt_sock_unregister(BTPROTO_L2CAP) < 0)
|
|
BT_ERR("L2CAP socket unregistration failed");
|
|
|
|
if (hci_unregister_proto(&l2cap_hci_proto) < 0)
|
|
BT_ERR("L2CAP protocol unregistration failed");
|
|
|
|
proto_unregister(&l2cap_proto);
|
|
}
|
|
|
|
void l2cap_load(void)
|
|
{
|
|
/* Dummy function to trigger automatic L2CAP module loading by
|
|
* other modules that use L2CAP sockets but don't use any other
|
|
* symbols from it. */
|
|
return;
|
|
}
|
|
EXPORT_SYMBOL(l2cap_load);
|
|
|
|
module_init(l2cap_init);
|
|
module_exit(l2cap_exit);
|
|
|
|
module_param(enable_ertm, bool, 0644);
|
|
MODULE_PARM_DESC(enable_ertm, "Enable enhanced retransmission mode");
|
|
|
|
MODULE_AUTHOR("Marcel Holtmann <marcel@holtmann.org>");
|
|
MODULE_DESCRIPTION("Bluetooth L2CAP ver " VERSION);
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MODULE_VERSION(VERSION);
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MODULE_LICENSE("GPL");
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MODULE_ALIAS("bt-proto-0");
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