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NFC: LLCP connect must wait for a CC frame 

Blocking sockets should sleep on a CC (Connection Complete) reception
from the connect() call.

Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
This commit is contained in:
Samuel Ortiz 2012-05-07 12:31:19 +02:00 committed by John W. Linville
parent 0f90936106
commit ff353d86a9
2 changed files with 48 additions and 1 deletions
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7
net/nfc/llcp/llcp.c
View File

@ -448,6 +448,8 @@ static struct nfc_llcp_sock *nfc_llcp_sock_get(struct nfc_llcp_local *local,
{
struct nfc_llcp_sock *sock, *llcp_sock, *n;
pr_debug("ssap dsap %d %d\n", ssap, dsap);
if (ssap == 0 && dsap == 0)
return NULL;
@ -783,6 +785,7 @@ static void nfc_llcp_recv_disc(struct nfc_llcp_local *local,
static void nfc_llcp_recv_cc(struct nfc_llcp_local *local, struct sk_buff *skb)
{
struct nfc_llcp_sock *llcp_sock;
struct sock *sk;
u8 dsap, ssap;
dsap = nfc_llcp_dsap(skb);
@ -801,10 +804,14 @@ static void nfc_llcp_recv_cc(struct nfc_llcp_local *local, struct sk_buff *skb)
}
llcp_sock->dsap = ssap;
sk = &llcp_sock->sk;
nfc_llcp_parse_tlv(local, &skb->data[LLCP_HEADER_SIZE],
skb->len - LLCP_HEADER_SIZE);
sk->sk_state = LLCP_CONNECTED;
sk->sk_state_change(sk);
nfc_llcp_sock_put(llcp_sock);
}

42
net/nfc/llcp/sock.c
View File

@ -27,6 +27,42 @@
#include "../nfc.h"
#include "llcp.h"
static int sock_wait_state(struct sock *sk, int state, unsigned long timeo)
{
DECLARE_WAITQUEUE(wait, current);
int err = 0;
pr_debug("sk %p", sk);
add_wait_queue(sk_sleep(sk), &wait);
set_current_state(TASK_INTERRUPTIBLE);
while (sk->sk_state != state) {
if (!timeo) {
err = -EINPROGRESS;
break;
}
if (signal_pending(current)) {
err = sock_intr_errno(timeo);
break;
}
release_sock(sk);
timeo = schedule_timeout(timeo);
lock_sock(sk);
set_current_state(TASK_INTERRUPTIBLE);
err = sock_error(sk);
if (err)
break;
}
__set_current_state(TASK_RUNNING);
remove_wait_queue(sk_sleep(sk), &wait);
return err;
}
static struct proto llcp_sock_proto = {
.name = "NFC_LLCP",
.owner = THIS_MODULE,
@ -462,9 +498,13 @@ static int llcp_sock_connect(struct socket *sock, struct sockaddr *_addr,
if (ret)
goto put_dev;
sk->sk_state = LLCP_CONNECTED;
ret = sock_wait_state(sk, LLCP_CONNECTED,
sock_sndtimeo(sk, flags & O_NONBLOCK));
if (ret)
goto put_dev;
release_sock(sk);
return 0;
put_dev: