l2tp: Make ipv4 protocol handler namespace aware.

The infrastructure is already pretty much entirely there
to allow this conversion.

The tunnel and session lookups have per-namespace tables,
and the ipv4 bind lookup includes the namespace in the
lookup key.

Set netns_ok in l2tp_ip_protocol.

Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/net/l2tp/l2tp_ip.c b/net/l2tp/l2tp_ip.c
index 61d8b75d2686c0272a1618887c08c34de2b4abe5..f7ac8f42fee2cfbff6cbf3c863f1614a7d6f5f31 100644 (file)
--- a/net/l2tp/l2tp_ip.c
+++ b/net/l2tp/l2tp_ip.c
@@ -115,6 +115,7 @@ static inline struct sock *l2tp_ip_bind_lookup(struct net *net, __be32 laddr, in
  */
 static int l2tp_ip_recv(struct sk_buff *skb)
 {
+       struct net *net = dev_net(skb->dev);
        struct sock *sk;
        u32 session_id;
        u32 tunnel_id;
@@ -142,7 +143,7 @@ static int l2tp_ip_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;
 
@@ -173,14 +174,14 @@ 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 iphdr *iph = (struct iphdr *) skb_network_header(skb);
 
                read_lock_bh(&l2tp_ip_lock);
-               sk = __l2tp_ip_bind_lookup(&init_net, iph->daddr, 0, tunnel_id);
+               sk = __l2tp_ip_bind_lookup(net, iph->daddr, 0, tunnel_id);
                read_unlock_bh(&l2tp_ip_lock);
        }
 
@@ -239,6 +240,7 @@ static int l2tp_ip_bind(struct sock *sk, struct sockaddr *uaddr, int addr_len)
 {
        struct inet_sock *inet = inet_sk(sk);
        struct sockaddr_l2tpip *addr = (struct sockaddr_l2tpip *) uaddr;
+       struct net *net = sock_net(sk);
        int ret;
        int chk_addr_ret;
 
@@ -251,7 +253,8 @@ static int l2tp_ip_bind(struct sock *sk, struct sockaddr *uaddr, int addr_len)
 
        ret = -EADDRINUSE;
        read_lock_bh(&l2tp_ip_lock);
-       if (__l2tp_ip_bind_lookup(&init_net, addr->l2tp_addr.s_addr, sk->sk_bound_dev_if, addr->l2tp_conn_id))
+       if (__l2tp_ip_bind_lookup(net, addr->l2tp_addr.s_addr,
+                                 sk->sk_bound_dev_if, addr->l2tp_conn_id))
                goto out_in_use;
 
        read_unlock_bh(&l2tp_ip_lock);
@@ -260,7 +263,7 @@ static int l2tp_ip_bind(struct sock *sk, struct sockaddr *uaddr, int addr_len)
        if (sk->sk_state != TCP_CLOSE || addr_len < sizeof(struct sockaddr_l2tpip))
                goto out;
 
-       chk_addr_ret = inet_addr_type(&init_net, addr->l2tp_addr.s_addr);
+       chk_addr_ret = inet_addr_type(net, addr->l2tp_addr.s_addr);
        ret = -EADDRNOTAVAIL;
        if (addr->l2tp_addr.s_addr && chk_addr_ret != RTN_LOCAL &&
            chk_addr_ret != RTN_MULTICAST && chk_addr_ret != RTN_BROADCAST)
@@ -369,7 +372,7 @@ static int l2tp_ip_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;
 }
@@ -605,6 +608,7 @@ static struct inet_protosw l2tp_ip_protosw = {
 
 static struct net_protocol l2tp_ip_protocol __read_mostly = {
        .handler        = l2tp_ip_recv,
+       .netns_ok       = 1,
 };
 
 static int __init l2tp_ip_init(void)