Commit 7198c77a authored by Guillaume Nault's avatar Guillaume Nault Committed by David S. Miller
Browse files

l2tp: avoid using ->tunnel_sock for getting session's parent tunnel 



Sessions don't need to use l2tp_sock_to_tunnel(xxx->tunnel_sock) for
accessing their parent tunnel. They have the .tunnel field in the
l2tp_session structure for that. Furthermore, in all these cases, the
session is registered, so we're guaranteed that .tunnel isn't NULL and
that the session properly holds a reference on the tunnel.

Signed-off-by: default avatarGuillaume Nault <g.nault@alphalink.fr>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 8fdfd659

net/l2tp/l2tp_ppp.c

+12 −54
Original line number Diff line number Diff line
@@ -295,7 +295,6 @@ static int pppol2tp_sendmsg(struct socket *sock, struct msghdr *m, 
	int error;

	struct l2tp_session *session;

	struct l2tp_tunnel *tunnel;

	struct pppol2tp_session *ps;

	int uhlen;



	error = -ENOTCONN;
@@ -308,10 +307,7 @@ static int pppol2tp_sendmsg(struct socket *sock, struct msghdr *m, 
	if (session == NULL)

		goto error;



	ps = l2tp_session_priv(session);

	tunnel = l2tp_sock_to_tunnel(ps->tunnel_sock);

	if (tunnel == NULL)

		goto error_put_sess;

	tunnel = session->tunnel;



	uhlen = (tunnel->encap == L2TP_ENCAPTYPE_UDP) ? sizeof(struct udphdr) : 0;
@@ -322,7 +318,7 @@ static int pppol2tp_sendmsg(struct socket *sock, struct msghdr *m, 
			   2 + total_len, /* 2 bytes for PPP_ALLSTATIONS & PPP_UI */

			   0, GFP_KERNEL);

	if (!skb)

		goto error_put_sess_tun;

		goto error_put_sess;



	/* Reserve space for headers. */

	skb_reserve(skb, NET_SKB_PAD);
@@ -340,20 +336,17 @@ static int pppol2tp_sendmsg(struct socket *sock, struct msghdr *m, 
	error = memcpy_from_msg(skb_put(skb, total_len), m, total_len);

	if (error < 0) {

		kfree_skb(skb);

		goto error_put_sess_tun;

		goto error_put_sess;

	}



	local_bh_disable();

	l2tp_xmit_skb(session, skb, session->hdr_len);

	local_bh_enable();



	sock_put(ps->tunnel_sock);

	sock_put(sk);



	return total_len;



error_put_sess_tun:

	sock_put(ps->tunnel_sock);

error_put_sess:

	sock_put(sk);

error:
@@ -377,10 +370,8 @@ error: 
static int pppol2tp_xmit(struct ppp_channel *chan, struct sk_buff *skb)

{

	struct sock *sk = (struct sock *) chan->private;

	struct sock *sk_tun;

	struct l2tp_session *session;

	struct l2tp_tunnel *tunnel;

	struct pppol2tp_session *ps;

	int uhlen, headroom;



	if (sock_flag(sk, SOCK_DEAD) || !(sk->sk_state & PPPOX_CONNECTED))
@@ -391,13 +382,7 @@ static int pppol2tp_xmit(struct ppp_channel *chan, struct sk_buff *skb) 
	if (session == NULL)

		goto abort;



	ps = l2tp_session_priv(session);

	sk_tun = ps->tunnel_sock;

	if (sk_tun == NULL)

		goto abort_put_sess;

	tunnel = l2tp_sock_to_tunnel(sk_tun);

	if (tunnel == NULL)

		goto abort_put_sess;

	tunnel = session->tunnel;



	uhlen = (tunnel->encap == L2TP_ENCAPTYPE_UDP) ? sizeof(struct udphdr) : 0;

	headroom = NET_SKB_PAD +
@@ -406,7 +391,7 @@ static int pppol2tp_xmit(struct ppp_channel *chan, struct sk_buff *skb) 
		   session->hdr_len +	/* L2TP header */

		   2;			/* 2 bytes for PPP_ALLSTATIONS & PPP_UI */

	if (skb_cow_head(skb, headroom))

		goto abort_put_sess_tun;

		goto abort_put_sess;



	/* Setup PPP header */

	__skb_push(skb, 2);
@@ -417,12 +402,10 @@ static int pppol2tp_xmit(struct ppp_channel *chan, struct sk_buff *skb) 
	l2tp_xmit_skb(session, skb, session->hdr_len);

	local_bh_enable();



	sock_put(sk_tun);

	sock_put(sk);



	return 1;



abort_put_sess_tun:

	sock_put(sk_tun);

abort_put_sess:

	sock_put(sk);

abort:
@@ -919,9 +902,7 @@ static int pppol2tp_getname(struct socket *sock, struct sockaddr *uaddr, 
		goto end;



	pls = l2tp_session_priv(session);

	tunnel = l2tp_sock_to_tunnel(pls->tunnel_sock);

	if (tunnel == NULL)

		goto end_put_sess;

	tunnel = session->tunnel;



	inet = inet_sk(tunnel->sock);

	if ((tunnel->version == 2) && (tunnel->sock->sk_family == AF_INET)) {
@@ -1001,8 +982,6 @@ static int pppol2tp_getname(struct socket *sock, struct sockaddr *uaddr, 
	*usockaddr_len = len;

	error = 0;



	sock_put(pls->tunnel_sock);

end_put_sess:

	sock_put(sk);

end:

	return error;
@@ -1241,7 +1220,6 @@ static int pppol2tp_ioctl(struct socket *sock, unsigned int cmd, 
	struct sock *sk = sock->sk;

	struct l2tp_session *session;

	struct l2tp_tunnel *tunnel;

	struct pppol2tp_session *ps;

	int err;



	if (!sk)
@@ -1265,16 +1243,10 @@ static int pppol2tp_ioctl(struct socket *sock, unsigned int cmd, 
	/* Special case: if session's session_id is zero, treat ioctl as a

	 * tunnel ioctl

	 */

	ps = l2tp_session_priv(session);

	if ((session->session_id == 0) &&

	    (session->peer_session_id == 0)) {

		err = -EBADF;

		tunnel = l2tp_sock_to_tunnel(ps->tunnel_sock);

		if (tunnel == NULL)

			goto end_put_sess;



		tunnel = session->tunnel;

		err = pppol2tp_tunnel_ioctl(tunnel, cmd, arg);

		sock_put(ps->tunnel_sock);

		goto end_put_sess;

	}
@@ -1400,7 +1372,6 @@ static int pppol2tp_setsockopt(struct socket *sock, int level, int optname, 
	struct sock *sk = sock->sk;

	struct l2tp_session *session;

	struct l2tp_tunnel *tunnel;

	struct pppol2tp_session *ps;

	int val;

	int err;
@@ -1425,20 +1396,14 @@ static int pppol2tp_setsockopt(struct socket *sock, int level, int optname, 


	/* Special case: if session_id == 0x0000, treat as operation on tunnel

	 */

	ps = l2tp_session_priv(session);

	if ((session->session_id == 0) &&

	    (session->peer_session_id == 0)) {

		err = -EBADF;

		tunnel = l2tp_sock_to_tunnel(ps->tunnel_sock);

		if (tunnel == NULL)

			goto end_put_sess;



		tunnel = session->tunnel;

		err = pppol2tp_tunnel_setsockopt(sk, tunnel, optname, val);

		sock_put(ps->tunnel_sock);

	} else

	} else {

		err = pppol2tp_session_setsockopt(sk, session, optname, val);

	}



end_put_sess:

	sock_put(sk);

end:

	return err;
@@ -1526,7 +1491,6 @@ static int pppol2tp_getsockopt(struct socket *sock, int level, int optname, 
	struct l2tp_tunnel *tunnel;

	int val, len;

	int err;

	struct pppol2tp_session *ps;



	if (level != SOL_PPPOL2TP)

		return -EINVAL;
@@ -1550,16 +1514,10 @@ static int pppol2tp_getsockopt(struct socket *sock, int level, int optname, 
		goto end;



	/* Special case: if session_id == 0x0000, treat as operation on tunnel */

	ps = l2tp_session_priv(session);

	if ((session->session_id == 0) &&

	    (session->peer_session_id == 0)) {

		err = -EBADF;

		tunnel = l2tp_sock_to_tunnel(ps->tunnel_sock);

		if (tunnel == NULL)

			goto end_put_sess;



		tunnel = session->tunnel;

		err = pppol2tp_tunnel_getsockopt(sk, tunnel, optname, &val);

		sock_put(ps->tunnel_sock);

		if (err)

			goto end_put_sess;

	} else {

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