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authorGuillaume Nault <g.nault@alphalink.fr>2017-01-06 20:03:57 +0100
committerDavid S. Miller <davem@davemloft.net>2017-01-06 22:18:56 -0500
commitc5fdae044030f753c9e6a3efa8db28fe00f8fdad (patch)
tree17f94b9c736444f4bccc732f586171a2505fdbe8 /net/l2tp
parent986f7cbc510e29c33b7c8c1701a902a752159425 (diff)
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: Guillaume Nault <g.nault@alphalink.fr> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/l2tp')
-rw-r--r--net/l2tp/l2tp_ip.c24
-rw-r--r--net/l2tp/l2tp_ip6.c25
2 files changed, 35 insertions, 14 deletions
diff --git a/net/l2tp/l2tp_ip.c b/net/l2tp/l2tp_ip.c
index 499d3cdbfbc8..b07a859f21bd 100644
--- a/net/l2tp/l2tp_ip.c
+++ b/net/l2tp/l2tp_ip.c
@@ -56,13 +56,23 @@ 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))
- goto found;
+ 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;
}
sk = NULL;
diff --git a/net/l2tp/l2tp_ip6.c b/net/l2tp/l2tp_ip6.c
index 7165b06d7b25..4b06eb415f68 100644
--- a/net/l2tp/l2tp_ip6.c
+++ b/net/l2tp/l2tp_ip6.c
@@ -69,13 +69,24 @@ 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))
- goto found;
+ 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;
}
sk = NULL;