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Commit bb23c0ab authored by Marcel Holtmann's avatar Marcel Holtmann
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Bluetooth: Add support for deferring RFCOMM connection setup 

In order to decide if listening RFCOMM sockets should be accept()ed
the BD_ADDR of the remote device needs to be known. This patch adds
a socket option which defines a timeout for deferring the actual
connection setup.

The connection setup is done after reading from the socket for the
first time. Until then writing to the socket returns ENOTCONN.
Signed-off-by: default avatarMarcel Holtmann <marcel@holtmann.org>
parent c4f912e1
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Showing with 88 additions and 18 deletions
include/net/bluetooth/rfcomm.h
View file @ bb23c0ab
......@@ -185,6 +185,7 @@ struct rfcomm_dlc {
u8 out;
u32 link_mode;
u32 defer_setup;
uint mtu;
uint cfc;
......@@ -206,6 +207,7 @@ struct rfcomm_dlc {
#define RFCOMM_AUTH_PENDING 4
#define RFCOMM_AUTH_ACCEPT 5
#define RFCOMM_AUTH_REJECT 6
#define RFCOMM_DEFER_SETUP 7
/* Scheduling flags and events */
#define RFCOMM_SCHED_STATE 0
......@@ -239,6 +241,7 @@ int rfcomm_dlc_close(struct rfcomm_dlc *d, int reason);
int rfcomm_dlc_send(struct rfcomm_dlc *d, struct sk_buff *skb);
int rfcomm_dlc_set_modem_status(struct rfcomm_dlc *d, u8 v24_sig);
int rfcomm_dlc_get_modem_status(struct rfcomm_dlc *d, u8 *v24_sig);
void rfcomm_dlc_accept(struct rfcomm_dlc *d);
#define rfcomm_dlc_lock(d) spin_lock(&d->lock)
#define rfcomm_dlc_unlock(d) spin_unlock(&d->lock)
......@@ -333,7 +336,6 @@ struct rfcomm_dev_req {
bdaddr_t src;
bdaddr_t dst;
u8 channel;
};
struct rfcomm_dev_info {
......
net/bluetooth/rfcomm/core.c
View file @ bb23c0ab
......@@ -421,9 +421,16 @@ static int __rfcomm_dlc_close(struct rfcomm_dlc *d, int err)
d, d->state, d->dlci, err, s);
switch (d->state) {
case BT_CONNECTED:
case BT_CONFIG:
case BT_CONNECT:
case BT_CONFIG:
if (test_and_clear_bit(RFCOMM_DEFER_SETUP, &d->flags)) {
set_bit(RFCOMM_AUTH_REJECT, &d->flags);
rfcomm_schedule(RFCOMM_SCHED_AUTH);
break;
}
/* Fall through */
case BT_CONNECTED:
d->state = BT_DISCONN;
if (skb_queue_empty(&d->tx_queue)) {
rfcomm_send_disc(s, d->dlci);
......@@ -434,6 +441,14 @@ static int __rfcomm_dlc_close(struct rfcomm_dlc *d, int err)
}
break;
case BT_OPEN:
if (test_and_clear_bit(RFCOMM_DEFER_SETUP, &d->flags)) {
set_bit(RFCOMM_AUTH_REJECT, &d->flags);
rfcomm_schedule(RFCOMM_SCHED_AUTH);
break;
}
/* Fall through */
default:
rfcomm_dlc_clear_timer(d);
......@@ -1162,7 +1177,7 @@ static int rfcomm_recv_disc(struct rfcomm_session *s, u8 dlci)
return 0;
}
static void rfcomm_dlc_accept(struct rfcomm_dlc *d)
void rfcomm_dlc_accept(struct rfcomm_dlc *d)
{
struct sock *sk = d->session->sock->sk;
......@@ -1181,6 +1196,20 @@ static void rfcomm_dlc_accept(struct rfcomm_dlc *d)
rfcomm_send_msc(d->session, 1, d->dlci, d->v24_sig);
}
static void rfcomm_check_accept(struct rfcomm_dlc *d)
{
if (rfcomm_check_link_mode(d)) {
set_bit(RFCOMM_AUTH_PENDING, &d->flags);
rfcomm_dlc_set_timer(d, RFCOMM_AUTH_TIMEOUT);
} else {
if (d->defer_setup) {
set_bit(RFCOMM_DEFER_SETUP, &d->flags);
rfcomm_dlc_set_timer(d, RFCOMM_AUTH_TIMEOUT);
} else
rfcomm_dlc_accept(d);
}
}
static int rfcomm_recv_sabm(struct rfcomm_session *s, u8 dlci)
{
struct rfcomm_dlc *d;
......@@ -1203,11 +1232,7 @@ static int rfcomm_recv_sabm(struct rfcomm_session *s, u8 dlci)
if (d) {
if (d->state == BT_OPEN) {
/* DLC was previously opened by PN request */
if (rfcomm_check_link_mode(d)) {
set_bit(RFCOMM_AUTH_PENDING, &d->flags);
rfcomm_dlc_set_timer(d, RFCOMM_AUTH_TIMEOUT);
} else
rfcomm_dlc_accept(d);
rfcomm_check_accept(d);
}
return 0;
}
......@@ -1219,11 +1244,7 @@ static int rfcomm_recv_sabm(struct rfcomm_session *s, u8 dlci)
d->addr = __addr(s->initiator, dlci);
rfcomm_dlc_link(s, d);
if (rfcomm_check_link_mode(d)) {
set_bit(RFCOMM_AUTH_PENDING, &d->flags);
rfcomm_dlc_set_timer(d, RFCOMM_AUTH_TIMEOUT);
} else
rfcomm_dlc_accept(d);
rfcomm_check_accept(d);
} else {
rfcomm_send_dm(s, dlci);
}
......@@ -1717,8 +1738,13 @@ static inline void rfcomm_process_dlcs(struct rfcomm_session *s)
if (d->out) {
rfcomm_send_pn(s, 1, d);
rfcomm_dlc_set_timer(d, RFCOMM_CONN_TIMEOUT);
} else {
if (d->defer_setup) {
set_bit(RFCOMM_DEFER_SETUP, &d->flags);
rfcomm_dlc_set_timer(d, RFCOMM_AUTH_TIMEOUT);
} else
rfcomm_dlc_accept(d);
}
if (d->link_mode & RFCOMM_LM_SECURE) {
struct sock *sk = s->sock->sk;
hci_conn_change_link_key(l2cap_pi(sk)->conn->hcon);
......
net/bluetooth/rfcomm/sock.c
View file @ bb23c0ab
......@@ -262,8 +262,10 @@ static void rfcomm_sock_init(struct sock *sk, struct sock *parent)
if (parent) {
sk->sk_type = parent->sk_type;
pi->link_mode = rfcomm_pi(parent)->link_mode;
pi->dlc->defer_setup = bt_sk(parent)->defer_setup;
} else {
pi->link_mode = 0;
pi->dlc->defer_setup = 0;
}
pi->dlc->link_mode = pi->link_mode;
......@@ -554,6 +556,9 @@ static int rfcomm_sock_sendmsg(struct kiocb *iocb, struct socket *sock,
struct sk_buff *skb;
int sent = 0;
if (test_bit(RFCOMM_DEFER_SETUP, &d->flags))
return -ENOTCONN;
if (msg->msg_flags & MSG_OOB)
return -EOPNOTSUPP;
......@@ -633,10 +638,16 @@ static int rfcomm_sock_recvmsg(struct kiocb *iocb, struct socket *sock,
struct msghdr *msg, size_t size, int flags)
{
struct sock *sk = sock->sk;
struct rfcomm_dlc *d = rfcomm_pi(sk)->dlc;
int err = 0;
size_t target, copied = 0;
long timeo;
if (test_and_clear_bit(RFCOMM_DEFER_SETUP, &d->flags)) {
rfcomm_dlc_accept(d);
return 0;
}
if (flags & MSG_OOB)
return -EOPNOTSUPP;
......@@ -746,6 +757,7 @@ static int rfcomm_sock_setsockopt(struct socket *sock, int level, int optname, c
{
struct sock *sk = sock->sk;
int err = 0;
u32 opt;
BT_DBG("sk %p", sk);
......@@ -755,6 +767,20 @@ static int rfcomm_sock_setsockopt(struct socket *sock, int level, int optname, c
lock_sock(sk);
switch (optname) {
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;
......@@ -785,7 +811,8 @@ static int rfcomm_sock_getsockopt_old(struct socket *sock, int optname, char __u
break;
case RFCOMM_CONNINFO:
if (sk->sk_state != BT_CONNECTED) {
if (sk->sk_state != BT_CONNECTED &&
!rfcomm_pi(sk)->dlc->defer_setup) {
err = -ENOTCONN;
break;
}
......@@ -826,6 +853,17 @@ static int rfcomm_sock_getsockopt(struct socket *sock, int level, int optname, c
lock_sock(sk);
switch (optname) {
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;
......@@ -938,6 +976,10 @@ int rfcomm_connect_ind(struct rfcomm_session *s, u8 channel, struct rfcomm_dlc *
done:
bh_unlock_sock(parent);
if (bt_sk(parent)->defer_setup)
parent->sk_state_change(parent);
return result;
}
......
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