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l2cap_core.c
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l2cap_core.c
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/*
BlueZ - Bluetooth protocol stack for Linux
Copyright (C) 2000-2001 Qualcomm Incorporated
Copyright (C) 2009-2010 Gustavo F. Padovan <[email protected]>
Copyright (C) 2010 Google Inc.
Written 2000,2001 by Maxim Krasnyansky <[email protected]>
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License version 2 as
published by the Free Software Foundation;
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT OF THIRD PARTY RIGHTS.
IN NO EVENT SHALL THE COPYRIGHT HOLDER(S) AND AUTHOR(S) BE LIABLE FOR ANY
CLAIM, OR ANY SPECIAL INDIRECT OR CONSEQUENTIAL DAMAGES, OR ANY DAMAGES
WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
ALL LIABILITY, INCLUDING LIABILITY FOR INFRINGEMENT OF ANY PATENTS,
COPYRIGHTS, TRADEMARKS OR OTHER RIGHTS, RELATING TO USE OF THIS
SOFTWARE IS DISCLAIMED.
*/
/* Bluetooth L2CAP core. */
#include <linux/module.h>
#include <linux/types.h>
#include <linux/capability.h>
#include <linux/errno.h>
#include <linux/kernel.h>
#include <linux/sched.h>
#include <linux/slab.h>
#include <linux/poll.h>
#include <linux/fcntl.h>
#include <linux/init.h>
#include <linux/interrupt.h>
#include <linux/socket.h>
#include <linux/skbuff.h>
#include <linux/list.h>
#include <linux/device.h>
#include <linux/debugfs.h>
#include <linux/seq_file.h>
#include <linux/uaccess.h>
#include <linux/crc16.h>
#include <net/sock.h>
#include <asm/system.h>
#include <asm/unaligned.h>
#include <net/bluetooth/bluetooth.h>
#include <net/bluetooth/hci_core.h>
#include <net/bluetooth/l2cap.h>
#define VERSION "2.15"
int disable_ertm;
static u32 l2cap_feat_mask = L2CAP_FEAT_FIXED_CHAN;
static u8 l2cap_fixed_chan[8] = { 0x02, };
static struct workqueue_struct *_busy_wq;
struct bt_sock_list l2cap_sk_list = {
.lock = __RW_LOCK_UNLOCKED(l2cap_sk_list.lock)
};
static void l2cap_busy_work(struct work_struct *work);
static struct sk_buff *l2cap_build_cmd(struct l2cap_conn *conn,
u8 code, u8 ident, u16 dlen, void *data);
static int l2cap_ertm_data_rcv(struct sock *sk, struct sk_buff *skb);
/* ---- L2CAP channels ---- */
static struct sock *__l2cap_get_chan_by_dcid(struct l2cap_chan_list *l, u16 cid)
{
struct sock *s;
for (s = l->head; s; s = l2cap_pi(s)->next_c) {
if (l2cap_pi(s)->dcid == cid)
break;
}
return s;
}
static struct sock *__l2cap_get_chan_by_scid(struct l2cap_chan_list *l, u16 cid)
{
struct sock *s;
for (s = l->head; s; s = l2cap_pi(s)->next_c) {
if (l2cap_pi(s)->scid == cid)
break;
}
return s;
}
/* Find channel with given SCID.
* Returns locked socket */
static inline struct sock *l2cap_get_chan_by_scid(struct l2cap_chan_list *l, u16 cid)
{
struct sock *s;
read_lock(&l->lock);
s = __l2cap_get_chan_by_scid(l, cid);
if (s)
bh_lock_sock(s);
read_unlock(&l->lock);
return s;
}
static struct sock *__l2cap_get_chan_by_ident(struct l2cap_chan_list *l, u8 ident)
{
struct sock *s;
for (s = l->head; s; s = l2cap_pi(s)->next_c) {
if (l2cap_pi(s)->ident == ident)
break;
}
return s;
}
static inline struct sock *l2cap_get_chan_by_ident(struct l2cap_chan_list *l, u8 ident)
{
struct sock *s;
read_lock(&l->lock);
s = __l2cap_get_chan_by_ident(l, ident);
if (s)
bh_lock_sock(s);
read_unlock(&l->lock);
return s;
}
static u16 l2cap_alloc_cid(struct l2cap_chan_list *l)
{
u16 cid = L2CAP_CID_DYN_START;
for (; cid < L2CAP_CID_DYN_END; cid++) {
if (!__l2cap_get_chan_by_scid(l, cid))
return cid;
}
return 0;
}
static inline void __l2cap_chan_link(struct l2cap_chan_list *l, struct sock *sk)
{
sock_hold(sk);
if (l->head)
l2cap_pi(l->head)->prev_c = sk;
l2cap_pi(sk)->next_c = l->head;
l2cap_pi(sk)->prev_c = NULL;
l->head = sk;
}
static inline void l2cap_chan_unlink(struct l2cap_chan_list *l, struct sock *sk)
{
struct sock *next = l2cap_pi(sk)->next_c, *prev = l2cap_pi(sk)->prev_c;
write_lock_bh(&l->lock);
if (sk == l->head)
l->head = next;
if (next)
l2cap_pi(next)->prev_c = prev;
if (prev)
l2cap_pi(prev)->next_c = next;
write_unlock_bh(&l->lock);
__sock_put(sk);
}
static void __l2cap_chan_add(struct l2cap_conn *conn, struct sock *sk, struct sock *parent)
{
struct l2cap_chan_list *l = &conn->chan_list;
BT_DBG("conn %p, psm 0x%2.2x, dcid 0x%4.4x", conn,
l2cap_pi(sk)->psm, l2cap_pi(sk)->dcid);
conn->disc_reason = 0x13;
l2cap_pi(sk)->conn = conn;
if (sk->sk_type == SOCK_SEQPACKET || sk->sk_type == SOCK_STREAM) {
/* Alloc CID for connection-oriented socket */
l2cap_pi(sk)->scid = l2cap_alloc_cid(l);
} else if (sk->sk_type == SOCK_DGRAM) {
/* Connectionless socket */
l2cap_pi(sk)->scid = L2CAP_CID_CONN_LESS;
l2cap_pi(sk)->dcid = L2CAP_CID_CONN_LESS;
l2cap_pi(sk)->omtu = L2CAP_DEFAULT_MTU;
} else {
/* Raw socket can send/recv signalling messages only */
l2cap_pi(sk)->scid = L2CAP_CID_SIGNALING;
l2cap_pi(sk)->dcid = L2CAP_CID_SIGNALING;
l2cap_pi(sk)->omtu = L2CAP_DEFAULT_MTU;
}
__l2cap_chan_link(l, sk);
if (parent)
bt_accept_enqueue(parent, sk);
}
/* Delete channel.
* Must be called on the locked socket. */
void l2cap_chan_del(struct sock *sk, int err)
{
struct l2cap_conn *conn = l2cap_pi(sk)->conn;
struct sock *parent = bt_sk(sk)->parent;
l2cap_sock_clear_timer(sk);
BT_DBG("sk %p, conn %p, err %d", sk, conn, err);
if (conn) {
/* Unlink from channel list */
l2cap_chan_unlink(&conn->chan_list, sk);
l2cap_pi(sk)->conn = NULL;
hci_conn_put(conn->hcon);
}
sk->sk_state = BT_CLOSED;
sock_set_flag(sk, SOCK_ZAPPED);
if (err)
sk->sk_err = err;
if (parent) {
bt_accept_unlink(sk);
parent->sk_data_ready(parent, 0);
} else
sk->sk_state_change(sk);
skb_queue_purge(TX_QUEUE(sk));
if (l2cap_pi(sk)->mode == L2CAP_MODE_ERTM) {
struct srej_list *l, *tmp;
del_timer(&l2cap_pi(sk)->retrans_timer);
del_timer(&l2cap_pi(sk)->monitor_timer);
del_timer(&l2cap_pi(sk)->ack_timer);
skb_queue_purge(SREJ_QUEUE(sk));
skb_queue_purge(BUSY_QUEUE(sk));
list_for_each_entry_safe(l, tmp, SREJ_LIST(sk), list) {
list_del(&l->list);
kfree(l);
}
}
}
static inline u8 l2cap_get_auth_type(struct sock *sk)
{
if (sk->sk_type == SOCK_RAW) {
switch (l2cap_pi(sk)->sec_level) {
case BT_SECURITY_HIGH:
return HCI_AT_DEDICATED_BONDING_MITM;
case BT_SECURITY_MEDIUM:
return HCI_AT_DEDICATED_BONDING;
default:
return HCI_AT_NO_BONDING;
}
} else if (l2cap_pi(sk)->psm == cpu_to_le16(0x0001)) {
if (l2cap_pi(sk)->sec_level == BT_SECURITY_LOW)
l2cap_pi(sk)->sec_level = BT_SECURITY_SDP;
if (l2cap_pi(sk)->sec_level == BT_SECURITY_HIGH)
return HCI_AT_NO_BONDING_MITM;
else
return HCI_AT_NO_BONDING;
} else {
switch (l2cap_pi(sk)->sec_level) {
case BT_SECURITY_HIGH:
return HCI_AT_GENERAL_BONDING_MITM;
case BT_SECURITY_MEDIUM:
return HCI_AT_GENERAL_BONDING;
default:
return HCI_AT_NO_BONDING;
}
}
}
/* Service level security */
static inline int l2cap_check_security(struct sock *sk)
{
struct l2cap_conn *conn = l2cap_pi(sk)->conn;
__u8 auth_type;
auth_type = l2cap_get_auth_type(sk);
return hci_conn_security(conn->hcon, l2cap_pi(sk)->sec_level,
auth_type);
}
u8 l2cap_get_ident(struct l2cap_conn *conn)
{
u8 id;
/* Get next available identificator.
* 1 - 128 are used by kernel.
* 129 - 199 are reserved.
* 200 - 254 are used by utilities like l2ping, etc.
*/
spin_lock_bh(&conn->lock);
if (++conn->tx_ident > 128)
conn->tx_ident = 1;
id = conn->tx_ident;
spin_unlock_bh(&conn->lock);
return id;
}
void l2cap_send_cmd(struct l2cap_conn *conn, u8 ident, u8 code, u16 len, void *data)
{
struct sk_buff *skb = l2cap_build_cmd(conn, code, ident, len, data);
u8 flags;
BT_DBG("code 0x%2.2x", code);
if (!skb)
return;
if (lmp_no_flush_capable(conn->hcon->hdev))
flags = ACL_START_NO_FLUSH;
else
flags = ACL_START;
hci_send_acl(conn->hcon, skb, flags);
}
static inline void l2cap_send_sframe(struct l2cap_pinfo *pi, u16 control)
{
struct sk_buff *skb;
struct l2cap_hdr *lh;
struct l2cap_conn *conn = pi->conn;
struct sock *sk = (struct sock *)pi;
int count, hlen = L2CAP_HDR_SIZE + 2;
u8 flags;
if (sk->sk_state != BT_CONNECTED)
return;
if (pi->fcs == L2CAP_FCS_CRC16)
hlen += 2;
BT_DBG("pi %p, control 0x%2.2x", pi, control);
count = min_t(unsigned int, conn->mtu, hlen);
control |= L2CAP_CTRL_FRAME_TYPE;
if (pi->conn_state & L2CAP_CONN_SEND_FBIT) {
control |= L2CAP_CTRL_FINAL;
pi->conn_state &= ~L2CAP_CONN_SEND_FBIT;
}
if (pi->conn_state & L2CAP_CONN_SEND_PBIT) {
control |= L2CAP_CTRL_POLL;
pi->conn_state &= ~L2CAP_CONN_SEND_PBIT;
}
skb = bt_skb_alloc(count, GFP_ATOMIC);
if (!skb)
return;
lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE);
lh->len = cpu_to_le16(hlen - L2CAP_HDR_SIZE);
lh->cid = cpu_to_le16(pi->dcid);
put_unaligned_le16(control, skb_put(skb, 2));
if (pi->fcs == L2CAP_FCS_CRC16) {
u16 fcs = crc16(0, (u8 *)lh, count - 2);
put_unaligned_le16(fcs, skb_put(skb, 2));
}
if (lmp_no_flush_capable(conn->hcon->hdev))
flags = ACL_START_NO_FLUSH;
else
flags = ACL_START;
hci_send_acl(pi->conn->hcon, skb, flags);
}
static inline void l2cap_send_rr_or_rnr(struct l2cap_pinfo *pi, u16 control)
{
if (pi->conn_state & L2CAP_CONN_LOCAL_BUSY) {
control |= L2CAP_SUPER_RCV_NOT_READY;
pi->conn_state |= L2CAP_CONN_RNR_SENT;
} else
control |= L2CAP_SUPER_RCV_READY;
control |= pi->buffer_seq << L2CAP_CTRL_REQSEQ_SHIFT;
l2cap_send_sframe(pi, control);
}
static inline int __l2cap_no_conn_pending(struct sock *sk)
{
return !(l2cap_pi(sk)->conf_state & L2CAP_CONF_CONNECT_PEND);
}
static void l2cap_do_start(struct sock *sk)
{
struct l2cap_conn *conn = l2cap_pi(sk)->conn;
if (conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_SENT) {
if (!(conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_DONE))
return;
if (l2cap_check_security(sk) && __l2cap_no_conn_pending(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_pi(sk)->conf_state |= L2CAP_CONF_CONNECT_PEND;
l2cap_send_cmd(conn, l2cap_pi(sk)->ident,
L2CAP_CONN_REQ, sizeof(req), &req);
}
} else {
struct l2cap_info_req req;
req.type = cpu_to_le16(L2CAP_IT_FEAT_MASK);
conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_SENT;
conn->info_ident = l2cap_get_ident(conn);
mod_timer(&conn->info_timer, jiffies +
msecs_to_jiffies(L2CAP_INFO_TIMEOUT));
l2cap_send_cmd(conn, conn->info_ident,
L2CAP_INFO_REQ, sizeof(req), &req);
}
}
static inline int l2cap_mode_supported(__u8 mode, __u32 feat_mask)
{
u32 local_feat_mask = l2cap_feat_mask;
if (!disable_ertm)
local_feat_mask |= L2CAP_FEAT_ERTM | L2CAP_FEAT_STREAMING;
switch (mode) {
case L2CAP_MODE_ERTM:
return L2CAP_FEAT_ERTM & feat_mask & local_feat_mask;
case L2CAP_MODE_STREAMING:
return L2CAP_FEAT_STREAMING & feat_mask & local_feat_mask;
default:
return 0x00;
}
}
void l2cap_send_disconn_req(struct l2cap_conn *conn, struct sock *sk, int err)
{
struct l2cap_disconn_req req;
if (!conn)
return;
skb_queue_purge(TX_QUEUE(sk));
if (l2cap_pi(sk)->mode == L2CAP_MODE_ERTM) {
del_timer(&l2cap_pi(sk)->retrans_timer);
del_timer(&l2cap_pi(sk)->monitor_timer);
del_timer(&l2cap_pi(sk)->ack_timer);
}
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);
sk->sk_state = BT_DISCONN;
sk->sk_err = err;
}
/* ---- L2CAP connections ---- */
static void l2cap_conn_start(struct l2cap_conn *conn)
{
struct l2cap_chan_list *l = &conn->chan_list;
struct sock_del_list del, *tmp1, *tmp2;
struct sock *sk;
BT_DBG("conn %p", conn);
INIT_LIST_HEAD(&del.list);
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 &&
sk->sk_type != SOCK_STREAM) {
bh_unlock_sock(sk);
continue;
}
if (sk->sk_state == BT_CONNECT) {
struct l2cap_conn_req req;
if (!l2cap_check_security(sk) ||
!__l2cap_no_conn_pending(sk)) {
bh_unlock_sock(sk);
continue;
}
if (!l2cap_mode_supported(l2cap_pi(sk)->mode,
conn->feat_mask)
&& l2cap_pi(sk)->conf_state &
L2CAP_CONF_STATE2_DEVICE) {
tmp1 = kzalloc(sizeof(struct sock_del_list),
GFP_ATOMIC);
tmp1->sk = sk;
list_add_tail(&tmp1->list, &del.list);
bh_unlock_sock(sk);
continue;
}
req.scid = cpu_to_le16(l2cap_pi(sk)->scid);
req.psm = l2cap_pi(sk)->psm;
l2cap_pi(sk)->ident = l2cap_get_ident(conn);
l2cap_pi(sk)->conf_state |= L2CAP_CONF_CONNECT_PEND;
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;
char buf[128];
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);
if (l2cap_pi(sk)->conf_state & L2CAP_CONF_REQ_SENT ||
rsp.result != L2CAP_CR_SUCCESS) {
bh_unlock_sock(sk);
continue;
}
l2cap_pi(sk)->conf_state |= L2CAP_CONF_REQ_SENT;
l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ,
l2cap_build_conf_req(sk, buf), buf);
l2cap_pi(sk)->num_conf_req++;
}
bh_unlock_sock(sk);
}
read_unlock(&l->lock);
list_for_each_entry_safe(tmp1, tmp2, &del.list, list) {
bh_lock_sock(tmp1->sk);
__l2cap_sock_close(tmp1->sk, ECONNRESET);
bh_unlock_sock(tmp1->sk);
list_del(&tmp1->list);
kfree(tmp1);
}
}
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 &&
sk->sk_type != SOCK_STREAM) {
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 ---- */
/* 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;
read_lock(&l2cap_sk_list.lock);
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;
}
}
read_unlock(&l2cap_sk_list.lock);
return node ? sk : sk1;
}
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;
auth_type = l2cap_get_auth_type(sk);
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 &&
sk->sk_type != SOCK_STREAM) {
l2cap_sock_clear_timer(sk);
if (l2cap_check_security(sk))
sk->sk_state = BT_CONNECTED;
} else
l2cap_do_start(sk);
}
done:
hci_dev_unlock_bh(hdev);
hci_dev_put(hdev);
return err;
}
int __l2cap_wait_ack(struct sock *sk)
{
DECLARE_WAITQUEUE(wait, current);
int err = 0;
int timeo = HZ/5;
add_wait_queue(sk_sleep(sk), &wait);
while ((l2cap_pi(sk)->unacked_frames > 0 && l2cap_pi(sk)->conn)) {
set_current_state(TASK_INTERRUPTIBLE);
if (!timeo)
timeo = HZ/5;
if (signal_pending(current)) {
err = sock_intr_errno(timeo);
break;
}
release_sock(sk);
timeo = schedule_timeout(timeo);
lock_sock(sk);
err = sock_error(sk);
if (err)
break;
}
set_current_state(TASK_RUNNING);
remove_wait_queue(sk_sleep(sk), &wait);
return err;
}
static void l2cap_monitor_timeout(unsigned long arg)
{
struct sock *sk = (void *) arg;
BT_DBG("sk %p", sk);
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, ECONNABORTED);
bh_unlock_sock(sk);
return;
}
l2cap_pi(sk)->retry_count++;
__mod_monitor_timer();
l2cap_send_rr_or_rnr(l2cap_pi(sk), L2CAP_CTRL_POLL);
bh_unlock_sock(sk);
}
static void l2cap_retrans_timeout(unsigned long arg)
{
struct sock *sk = (void *) arg;
BT_DBG("sk %p", sk);
bh_lock_sock(sk);
l2cap_pi(sk)->retry_count = 1;
__mod_monitor_timer();
l2cap_pi(sk)->conn_state |= L2CAP_CONN_WAIT_F;
l2cap_send_rr_or_rnr(l2cap_pi(sk), L2CAP_CTRL_POLL);
bh_unlock_sock(sk);
}
static void l2cap_drop_acked_frames(struct sock *sk)
{
struct sk_buff *skb;
while ((skb = skb_peek(TX_QUEUE(sk))) &&
l2cap_pi(sk)->unacked_frames) {
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);
}
void l2cap_do_send(struct sock *sk, struct sk_buff *skb)
{
struct l2cap_pinfo *pi = l2cap_pi(sk);
struct hci_conn *hcon = pi->conn->hcon;
u16 flags;
BT_DBG("sk %p, skb %p len %d", sk, skb, skb->len);
if (!pi->flushable && lmp_no_flush_capable(hcon->hdev))
flags = ACL_START_NO_FLUSH;
else
flags = ACL_START;
hci_send_acl(hcon, skb, flags);
}
void l2cap_streaming_send(struct sock *sk)
{
struct sk_buff *skb;
struct l2cap_pinfo *pi = l2cap_pi(sk);
u16 control, fcs;
while ((skb = skb_dequeue(TX_QUEUE(sk)))) {
control = get_unaligned_le16(skb->data + L2CAP_HDR_SIZE);
control |= pi->next_tx_seq << L2CAP_CTRL_TXSEQ_SHIFT;
put_unaligned_le16(control, skb->data + L2CAP_HDR_SIZE);
if (pi->fcs == L2CAP_FCS_CRC16) {
fcs = crc16(0, (u8 *)skb->data, skb->len - 2);
put_unaligned_le16(fcs, skb->data + skb->len - 2);
}
l2cap_do_send(sk, skb);
pi->next_tx_seq = (pi->next_tx_seq + 1) % 64;
}
}
static void l2cap_retransmit_one_frame(struct sock *sk, u8 tx_seq)
{
struct l2cap_pinfo *pi = l2cap_pi(sk);
struct sk_buff *skb, *tx_skb;
u16 control, fcs;
skb = skb_peek(TX_QUEUE(sk));
if (!skb)
return;
do {
if (bt_cb(skb)->tx_seq == tx_seq)
break;
if (skb_queue_is_last(TX_QUEUE(sk), skb))
return;
} while ((skb = skb_queue_next(TX_QUEUE(sk), skb)));
if (pi->remote_max_tx &&
bt_cb(skb)->retries == pi->remote_max_tx) {
l2cap_send_disconn_req(pi->conn, sk, ECONNABORTED);
return;
}
tx_skb = skb_clone(skb, GFP_ATOMIC);
bt_cb(skb)->retries++;
control = get_unaligned_le16(tx_skb->data + L2CAP_HDR_SIZE);
if (pi->conn_state & L2CAP_CONN_SEND_FBIT) {
control |= L2CAP_CTRL_FINAL;
pi->conn_state &= ~L2CAP_CONN_SEND_FBIT;
}
control |= (pi->buffer_seq << L2CAP_CTRL_REQSEQ_SHIFT)
| (tx_seq << L2CAP_CTRL_TXSEQ_SHIFT);
put_unaligned_le16(control, tx_skb->data + L2CAP_HDR_SIZE);
if (pi->fcs == L2CAP_FCS_CRC16) {
fcs = crc16(0, (u8 *)tx_skb->data, tx_skb->len - 2);
put_unaligned_le16(fcs, tx_skb->data + tx_skb->len - 2);
}
l2cap_do_send(sk, tx_skb);
}
int l2cap_ertm_send(struct sock *sk)
{
struct sk_buff *skb, *tx_skb;
struct l2cap_pinfo *pi = l2cap_pi(sk);
u16 control, fcs;
int nsent = 0;
if (sk->sk_state != BT_CONNECTED)
return -ENOTCONN;
while ((skb = sk->sk_send_head) && (!l2cap_tx_window_full(sk))) {
if (pi->remote_max_tx &&
bt_cb(skb)->retries == pi->remote_max_tx) {
l2cap_send_disconn_req(pi->conn, sk, ECONNABORTED);
break;
}
tx_skb = skb_clone(skb, GFP_ATOMIC);
bt_cb(skb)->retries++;
control = get_unaligned_le16(tx_skb->data + L2CAP_HDR_SIZE);
control &= L2CAP_CTRL_SAR;
if (pi->conn_state & L2CAP_CONN_SEND_FBIT) {
control |= L2CAP_CTRL_FINAL;
pi->conn_state &= ~L2CAP_CONN_SEND_FBIT;
}
control |= (pi->buffer_seq << L2CAP_CTRL_REQSEQ_SHIFT)