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Commit 3038eeac authored by David S. Miller's avatar David S. Miller
Browse files

ipv4: Lock socket and use cork flow in ip4_datagram_connect(). 



This is to make sure that an l2tp socket's inet cork flow is
fully filled in, when it's encapsulated in UDP.

Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent fdbb0f07

net/ipv4/datagram.c

+15 −8
Original line number Diff line number Diff line
@@ -24,7 +24,7 @@ int ip4_datagram_connect(struct sock *sk, struct sockaddr *uaddr, int addr_len) 
{

	struct inet_sock *inet = inet_sk(sk);

	struct sockaddr_in *usin = (struct sockaddr_in *) uaddr;

	struct flowi4 fl4;

	struct flowi4 *fl4;

	struct rtable *rt;

	__be32 saddr;

	int oif;
@@ -39,6 +39,8 @@ int ip4_datagram_connect(struct sock *sk, struct sockaddr *uaddr, int addr_len) 


	sk_dst_reset(sk);



	lock_sock(sk);



	oif = sk->sk_bound_dev_if;

	saddr = inet->inet_saddr;

	if (ipv4_is_multicast(usin->sin_addr.s_addr)) {
@@ -47,7 +49,8 @@ int ip4_datagram_connect(struct sock *sk, struct sockaddr *uaddr, int addr_len) 
		if (!saddr)

			saddr = inet->mc_addr;

	}

	rt = ip_route_connect(&fl4, usin->sin_addr.s_addr, saddr,

	fl4 = &inet->cork.fl.u.ip4;

	rt = ip_route_connect(fl4, usin->sin_addr.s_addr, saddr,

			      RT_CONN_FLAGS(sk), oif,

			      sk->sk_protocol,

			      inet->inet_sport, usin->sin_port, sk, true);
@@ -55,26 +58,30 @@ int ip4_datagram_connect(struct sock *sk, struct sockaddr *uaddr, int addr_len) 
		err = PTR_ERR(rt);

		if (err == -ENETUNREACH)

			IP_INC_STATS_BH(sock_net(sk), IPSTATS_MIB_OUTNOROUTES);

		return err;

		goto out;

	}



	if ((rt->rt_flags & RTCF_BROADCAST) && !sock_flag(sk, SOCK_BROADCAST)) {

		ip_rt_put(rt);

		return -EACCES;

		err = -EACCES;

		goto out;

	}

	if (!inet->inet_saddr)

		inet->inet_saddr = fl4.saddr;	/* Update source address */

		inet->inet_saddr = fl4->saddr;	/* Update source address */

	if (!inet->inet_rcv_saddr) {

		inet->inet_rcv_saddr = fl4.saddr;

		inet->inet_rcv_saddr = fl4->saddr;

		if (sk->sk_prot->rehash)

			sk->sk_prot->rehash(sk);

	}

	inet->inet_daddr = fl4.daddr;

	inet->inet_daddr = fl4->daddr;

	inet->inet_dport = usin->sin_port;

	sk->sk_state = TCP_ESTABLISHED;

	inet->inet_id = jiffies;



	sk_dst_set(sk, &rt->dst);

	return 0;

	err = 0;

out:

	release_sock(sk);

	return err;

}

EXPORT_SYMBOL(ip4_datagram_connect);