net: l2tp: Make l2tp_ip6 namespace aware

l2tp_ip6 tunnel and session lookups were still using init_net, although
the l2tp core infrastructure already supports lookups keyed by 'net'.

As a result, l2tp_ip6_recv discarded packets for tunnels/sessions
created in namespaces other than the init_net.

Fix, by using dev_net(skb->dev) or sock_net(sk) where appropriate.

Signed-off-by: Shmulik Ladkani <shmulik.ladkani@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/net/l2tp/l2tp_ip6.c b/net/l2tp/l2tp_ip6.c
index c6f5df1bed121e2b701c50542bddb6e403b1e1d8..6c54e03fe9c1751217e246f31d6ca1f322762539 100644 (file)
--- a/net/l2tp/l2tp_ip6.c
+++ b/net/l2tp/l2tp_ip6.c
@@ -128,6 +128,7 @@ static inline struct sock *l2tp_ip6_bind_lookup(struct net *net,
  */
 static int l2tp_ip6_recv(struct sk_buff *skb)
 {
+       struct net *net = dev_net(skb->dev);
        struct sock *sk;
        u32 session_id;
        u32 tunnel_id;
@@ -154,7 +155,7 @@ static int l2tp_ip6_recv(struct sk_buff *skb)
        }
 
        /* Ok, this is a data packet. Lookup the session. */
-       session = l2tp_session_find(&init_net, NULL, session_id);
+       session = l2tp_session_find(net, NULL, session_id);
        if (session == NULL)
                goto discard;
 
@@ -188,14 +189,14 @@ pass_up:
                goto discard;
 
        tunnel_id = ntohl(*(__be32 *) &skb->data[4]);
-       tunnel = l2tp_tunnel_find(&init_net, tunnel_id);
+       tunnel = l2tp_tunnel_find(net, tunnel_id);
        if (tunnel != NULL)
                sk = tunnel->sock;
        else {
                struct ipv6hdr *iph = ipv6_hdr(skb);
 
                read_lock_bh(&l2tp_ip6_lock);
-               sk = __l2tp_ip6_bind_lookup(&init_net, &iph->daddr,
+               sk = __l2tp_ip6_bind_lookup(net, &iph->daddr,
                                            0, tunnel_id);
                read_unlock_bh(&l2tp_ip6_lock);
        }
@@ -263,6 +264,7 @@ static int l2tp_ip6_bind(struct sock *sk, struct sockaddr *uaddr, int addr_len)
        struct inet_sock *inet = inet_sk(sk);
        struct ipv6_pinfo *np = inet6_sk(sk);
        struct sockaddr_l2tpip6 *addr = (struct sockaddr_l2tpip6 *) uaddr;
+       struct net *net = sock_net(sk);
        __be32 v4addr = 0;
        int addr_type;
        int err;
@@ -286,7 +288,7 @@ static int l2tp_ip6_bind(struct sock *sk, struct sockaddr *uaddr, int addr_len)
 
        err = -EADDRINUSE;
        read_lock_bh(&l2tp_ip6_lock);
-       if (__l2tp_ip6_bind_lookup(&init_net, &addr->l2tp_addr,
+       if (__l2tp_ip6_bind_lookup(net, &addr->l2tp_addr,
                                   sk->sk_bound_dev_if, addr->l2tp_conn_id))
                goto out_in_use;
        read_unlock_bh(&l2tp_ip6_lock);
@@ -456,7 +458,7 @@ static int l2tp_ip6_backlog_recv(struct sock *sk, struct sk_buff *skb)
        return 0;
 
 drop:
-       IP_INC_STATS(&init_net, IPSTATS_MIB_INDISCARDS);
+       IP_INC_STATS(sock_net(sk), IPSTATS_MIB_INDISCARDS);
        kfree_skb(skb);
        return -1;
 }