Commit c5fdae04 authored by Guillaume Nault's avatar Guillaume Nault Committed by David S. Miller
Browse files

l2tp: rework socket comparison in __l2tp_ip*_bind_lookup() 



Split conditions, so that each test becomes clearer.

Also, for l2tp_ip, check if "laddr" is 0. This prevents a socket from
binding to the unspecified address when other sockets are already bound
using the same device (if any), connection ID and namespace.

Same thing for l2tp_ip6: add ipv6_addr_any(laddr) and
ipv6_addr_any(raddr) tests to ensure that an IPv6 unspecified address
passed as parameter is properly treated a wildcard.

Signed-off-by: default avatarGuillaume Nault <g.nault@alphalink.fr>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 986f7cbc

net/l2tp/l2tp_ip.c

+17 −7
Original line number Diff line number Diff line
@@ -56,12 +56,22 @@ static struct sock *__l2tp_ip_bind_lookup(const struct net *net, __be32 laddr, 
		const struct l2tp_ip_sock *l2tp = l2tp_ip_sk(sk);

		const struct inet_sock *inet = inet_sk(sk);



		if ((l2tp->conn_id == tunnel_id) &&

		    net_eq(sock_net(sk), net) &&

		    !(inet->inet_rcv_saddr && inet->inet_rcv_saddr != laddr) &&

		    (!inet->inet_daddr || !raddr || inet->inet_daddr == raddr) &&

		    (!sk->sk_bound_dev_if || !dif ||

		     sk->sk_bound_dev_if == dif))

		if (!net_eq(sock_net(sk), net))

			continue;



		if (sk->sk_bound_dev_if && dif && sk->sk_bound_dev_if != dif)

			continue;



		if (inet->inet_rcv_saddr && laddr &&

		    inet->inet_rcv_saddr != laddr)

			continue;



		if (inet->inet_daddr && raddr && inet->inet_daddr != raddr)

			continue;



		if (l2tp->conn_id != tunnel_id)

			continue;



		goto found;

	}

net/l2tp/l2tp_ip6.c

+18 −7
Original line number Diff line number Diff line
@@ -69,12 +69,23 @@ static struct sock *__l2tp_ip6_bind_lookup(const struct net *net, 
		const struct in6_addr *sk_raddr = &sk->sk_v6_daddr;

		const struct l2tp_ip6_sock *l2tp = l2tp_ip6_sk(sk);



		if ((l2tp->conn_id == tunnel_id) &&

		    net_eq(sock_net(sk), net) &&

		    (!sk_laddr || ipv6_addr_any(sk_laddr) || ipv6_addr_equal(sk_laddr, laddr)) &&

		    (!raddr || ipv6_addr_any(sk_raddr) || ipv6_addr_equal(sk_raddr, raddr)) &&

		    (!sk->sk_bound_dev_if || !dif ||

		     sk->sk_bound_dev_if == dif))

		if (!net_eq(sock_net(sk), net))

			continue;



		if (sk->sk_bound_dev_if && dif && sk->sk_bound_dev_if != dif)

			continue;



		if (sk_laddr && !ipv6_addr_any(sk_laddr) &&

		    !ipv6_addr_any(laddr) && !ipv6_addr_equal(sk_laddr, laddr))

			continue;



		if (!ipv6_addr_any(sk_raddr) && raddr &&

		    !ipv6_addr_any(raddr) && !ipv6_addr_equal(sk_raddr, raddr))

			continue;



		if (l2tp->conn_id != tunnel_id)

			continue;



		goto found;

	}

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