gre: add x-netns support

This patch allows to switch the netns when packet is encapsulated or
decapsulated. In other word, the encapsulated packet is received in a netns,
where the lookup is done to find the tunnel. Once the tunnel is found, the
packet is decapsulated and injecting into the corresponding interface which
stands to another netns.

When one of the two netns is removed, the tunnel is destroyed.

Signed-off-by: Nicolas Dichtel <nicolas.dichtel@6wind.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/net/ipv4/ip_gre.c b/net/ipv4/ip_gre.c
index 94213c89156511d86682b2c3e034f9e5b6ef5ccb..c5a557a06a31ae589a0938d2d1a12073ae3706df 100644 (file)
--- a/net/ipv4/ip_gre.c
+++ b/net/ipv4/ip_gre.c
@@ -410,7 +410,7 @@ static int ipgre_open(struct net_device *dev)
                struct flowi4 fl4;
                struct rtable *rt;
 
-               rt = ip_route_output_gre(dev_net(dev), &fl4,
+               rt = ip_route_output_gre(t->net, &fl4,
                                         t->parms.iph.daddr,
                                         t->parms.iph.saddr,
                                         t->parms.o_key,
@@ -434,7 +434,7 @@ static int ipgre_close(struct net_device *dev)
 
        if (ipv4_is_multicast(t->parms.iph.daddr) && t->mlink) {
                struct in_device *in_dev;
-               in_dev = inetdev_by_index(dev_net(dev), t->mlink);
+               in_dev = inetdev_by_index(t->net, t->mlink);
                if (in_dev)
                        ip_mc_dec_group(in_dev, t->parms.iph.daddr);
        }
@@ -478,7 +478,7 @@ static void __gre_tunnel_init(struct net_device *dev)
        dev->needed_headroom    = LL_MAX_HEADER + sizeof(struct iphdr) + 4;
        dev->mtu                = ETH_DATA_LEN - sizeof(struct iphdr) - 4;
 
-       dev->features           |= NETIF_F_NETNS_LOCAL | GRE_FEATURES;
+       dev->features           |= GRE_FEATURES;
        dev->hw_features        |= GRE_FEATURES;
 
        if (!(tunnel->parms.o_flags & TUNNEL_SEQ)) {