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Pablo Neira Ayuso pablo at soleta.euOn Tue, Nov 17, 2015 at 12:06:19PM +0100, Andreas Schultz wrote: > This permits a split namespace setup where the GTP transport > sockets are in one namespace the gtp tunnel interface is in > another namespace. > > The target namespece is selected by the new GTPA_NET_NS_FD NL > attributes. It fall back to the netns of the GTP-U sockets if > the NL attr is not present. > > Signed-off-by: Andreas Schultz <aschultz at tpip.net> > --- > gtp.c | 35 +++++++++++++++++++++++++++++++---- > gtp_nl.h | 1 + > 2 files changed, 32 insertions(+), 4 deletions(-) > > diff --git a/gtp.c b/gtp.c > index cbe2da1..0a45f53 100644 > --- a/gtp.c > +++ b/gtp.c > @@ -740,7 +740,7 @@ static int gtp_encap_enable(struct net_device *dev, struct gtp_instance *gti, > static int gtp_newlink(struct net *src_net, struct net_device *dev, > struct nlattr *tb[], struct nlattr *data[]) > { > - struct gtp_net *gn = net_generic(src_net, gtp_net_id); > + struct gtp_net *gn; > struct net_device *real_dev; > struct gtp_instance *gti; > int hashsize, err, fd0, fd1; > @@ -780,6 +780,7 @@ static int gtp_newlink(struct net *src_net, struct net_device *dev, > if (err < 0) > goto err1; > > + gn = net_generic(dev_net(dev), gtp_net_id); > list_add_rcu(>i->list, &gn->gtp_instance_list); > > netdev_dbg(dev, "registered new interface\n"); > @@ -847,6 +848,19 @@ static struct rtnl_link_ops gtp_link_ops __read_mostly = { > .fill_info = gtp_fill_info, > }; > > +static struct net *gtp_genl_get_net(struct net *src_net, struct nlattr *tb[]) > +{ > + struct net *net; > + /* Examine the link attributes and figure out which > + * network namespace we are talking about. > + */ > + if (tb[GTPA_NET_NS_FD]) > + net = get_net_ns_by_fd(nla_get_u32(tb[GTPA_NET_NS_FD])); > + else > + net = get_net(src_net); > + return net; > +} > + > static int gtp_hashtable_new(struct gtp_instance *gti, int hsize) > { > int i; > @@ -1065,7 +1079,7 @@ static int ipv4_pdp_add(struct net_device *dev, struct genl_info *info) > > static int gtp_genl_tunnel_new(struct sk_buff *skb, struct genl_info *info) > { > - struct net *net = sock_net(skb->sk); > + struct net *net; > struct net_device *dev; > > if (!info->attrs[GTPA_VERSION] || > @@ -1075,6 +1089,10 @@ static int gtp_genl_tunnel_new(struct sk_buff *skb, struct genl_info *info) > !info->attrs[GTPA_TID]) > return -EINVAL; > > + net = gtp_genl_get_net(sock_net(skb->sk), info->attrs); > + if (IS_ERR(net)) > + return -EINVAL; You probably want to propagate the real error reason: return PTR_ERR(net);