7 files changed, 50 insertions, 23 deletions

diff --git a/drivers/net/can/dev.c b/drivers/net/can/dev.c
index c3db111d2ff5..5fe34d64ca2a 100644
--- a/drivers/net/can/dev.c
+++ b/drivers/net/can/dev.c
@@ -674,7 +674,7 @@ nla_put_failure:
         return -EMSGSIZE;
 }
 
-static int can_newlink(struct net_device *dev,
+static int can_newlink(struct net *src_net, struct net_device *dev,
                        struct nlattr *tb[], struct nlattr *data[])
 {
         return -EOPNOTSUPP;
diff --git a/drivers/net/macvlan.c b/drivers/net/macvlan.c
index 20b7707f38ef..d7dba3f6f763 100644
--- a/drivers/net/macvlan.c
+++ b/drivers/net/macvlan.c
@@ -504,7 +504,7 @@ static int macvlan_get_tx_queues(struct net *net,
         return 0;
 }
 
-static int macvlan_newlink(struct net_device *dev,
+static int macvlan_newlink(struct net *src_net, struct net_device *dev,
                            struct nlattr *tb[], struct nlattr *data[])
 {
         struct macvlan_dev *vlan = netdev_priv(dev);
@@ -515,7 +515,7 @@ static int macvlan_newlink(struct net_device *dev,
         if (!tb[IFLA_LINK])
                 return -EINVAL;
 
-        lowerdev = __dev_get_by_index(dev_net(dev), nla_get_u32(tb[IFLA_LINK]));
+        lowerdev = __dev_get_by_index(src_net, nla_get_u32(tb[IFLA_LINK]));
         if (lowerdev == NULL)
                 return -ENODEV;
 
diff --git a/drivers/net/veth.c b/drivers/net/veth.c
index 9bed694cd215..2d657f2314cb 100644
--- a/drivers/net/veth.c
+++ b/drivers/net/veth.c
@@ -340,7 +340,7 @@ static int veth_validate(struct nlattr *tb[], struct nlattr *data[])
 
 static struct rtnl_link_ops veth_link_ops;
 
-static int veth_newlink(struct net_device *dev,
+static int veth_newlink(struct net *src_net, struct net_device *dev,
                          struct nlattr *tb[], struct nlattr *data[])
 {
         int err;
@@ -348,6 +348,7 @@ static int veth_newlink(struct net_device *dev,
         struct veth_priv *priv;
         char ifname[IFNAMSIZ];
         struct nlattr *peer_tb[IFLA_MAX + 1], **tbp;
+        struct net *net;
 
         /*
          * create and register peer first
@@ -380,14 +381,22 @@ static int veth_newlink(struct net_device *dev,
         else
                 snprintf(ifname, IFNAMSIZ, DRV_NAME "%%d");
 
-        peer = rtnl_create_link(dev_net(dev), ifname, &veth_link_ops, tbp);
-        if (IS_ERR(peer))
+        net = rtnl_link_get_net(src_net, tbp);
+        if (IS_ERR(net))
+                return PTR_ERR(net);
+
+        peer = rtnl_create_link(src_net, net, ifname, &veth_link_ops, tbp);
+        if (IS_ERR(peer)) {
+                put_net(net);
                 return PTR_ERR(peer);
+        }
 
         if (tbp[IFLA_ADDRESS] == NULL)
                 random_ether_addr(peer->dev_addr);
 
         err = register_netdevice(peer);
+        put_net(net);
+        net = NULL;
         if (err < 0)
                 goto err_register_peer;
 
diff --git a/include/net/rtnetlink.h b/include/net/rtnetlink.h
index cd5af1f508f2..48d3efcb0880 100644
--- a/include/net/rtnetlink.h
+++ b/include/net/rtnetlink.h
@@ -55,7 +55,8 @@ struct rtnl_link_ops {
         int                     (*validate)(struct nlattr *tb[],
                                             struct nlattr *data[]);
 
-        int                     (*newlink)(struct net_device *dev,
+        int                     (*newlink)(struct net *src_net,
+                                           struct net_device *dev,
                                            struct nlattr *tb[],
                                            struct nlattr *data[]);
         int                     (*changelink)(struct net_device *dev,
@@ -83,8 +84,9 @@ extern void	rtnl_kill_links(struct net *net, struct rtnl_link_ops *ops);
 extern int      rtnl_link_register(struct rtnl_link_ops *ops);
 extern void     rtnl_link_unregister(struct rtnl_link_ops *ops);
 
-extern struct net_device *rtnl_create_link(struct net *net, char *ifname,
-                const struct rtnl_link_ops *ops, struct nlattr *tb[]);
+extern struct net *rtnl_link_get_net(struct net *src_net, struct nlattr *tb[]);
+extern struct net_device *rtnl_create_link(struct net *src_net, struct net *net,
+        char *ifname, const struct rtnl_link_ops *ops, struct nlattr *tb[]);
 extern const struct nla_policy ifla_policy[IFLA_MAX+1];
 
 #define MODULE_ALIAS_RTNL_LINK(kind) MODULE_ALIAS("rtnl-link-" kind)
diff --git a/net/8021q/vlan_netlink.c b/net/8021q/vlan_netlink.c
index a91504850195..3c9cf6a8e7fb 100644
--- a/net/8021q/vlan_netlink.c
+++ b/net/8021q/vlan_netlink.c
@@ -119,7 +119,7 @@ static int vlan_get_tx_queues(struct net *net,
         return 0;
 }
 
-static int vlan_newlink(struct net_device *dev,
+static int vlan_newlink(struct net *src_net, struct net_device *dev,
                         struct nlattr *tb[], struct nlattr *data[])
 {
         struct vlan_dev_info *vlan = vlan_dev_info(dev);
@@ -131,7 +131,7 @@ static int vlan_newlink(struct net_device *dev,
 
         if (!tb[IFLA_LINK])
                 return -EINVAL;
-        real_dev = __dev_get_by_index(dev_net(dev), nla_get_u32(tb[IFLA_LINK]));
+        real_dev = __dev_get_by_index(src_net, nla_get_u32(tb[IFLA_LINK]));
         if (!real_dev)
                 return -ENODEV;
 
diff --git a/net/core/rtnetlink.c b/net/core/rtnetlink.c
index e2f3317f290f..33148a568199 100644
--- a/net/core/rtnetlink.c
+++ b/net/core/rtnetlink.c
@@ -733,6 +733,20 @@ static const struct nla_policy ifla_info_policy[IFLA_INFO_MAX+1] = {
         [IFLA_INFO_DATA]        = { .type = NLA_NESTED },
 };
 
+struct net *rtnl_link_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[IFLA_NET_NS_PID])
+                net = get_net_ns_by_pid(nla_get_u32(tb[IFLA_NET_NS_PID]));
+        else
+                net = get_net(src_net);
+        return net;
+}
+EXPORT_SYMBOL(rtnl_link_get_net);
+
 static int validate_linkmsg(struct net_device *dev, struct nlattr *tb[])
 {
         if (dev) {
@@ -756,8 +770,7 @@ static int do_setlink(struct net_device *dev, struct ifinfomsg *ifm,
         int err;
 
         if (tb[IFLA_NET_NS_PID]) {
-                struct net *net;
-                net = get_net_ns_by_pid(nla_get_u32(tb[IFLA_NET_NS_PID]));
+                struct net *net = rtnl_link_get_net(dev_net(dev), tb);
                 if (IS_ERR(net)) {
                         err = PTR_ERR(net);
                         goto errout;
@@ -976,8 +989,8 @@ static int rtnl_dellink(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
         return 0;
 }
 
-struct net_device *rtnl_create_link(struct net *net, char *ifname,
-                const struct rtnl_link_ops *ops, struct nlattr *tb[])
+struct net_device *rtnl_create_link(struct net *src_net, struct net *net,
+        char *ifname, const struct rtnl_link_ops *ops, struct nlattr *tb[])
 {
         int err;
         struct net_device *dev;
@@ -985,7 +998,7 @@ struct net_device *rtnl_create_link(struct net *net, char *ifname,
         unsigned int real_num_queues = 1;
 
         if (ops->get_tx_queues) {
-                err = ops->get_tx_queues(net, tb, &num_queues,
+                err = ops->get_tx_queues(src_net, tb, &num_queues,
                                          &real_num_queues);
                 if (err)
                         goto err;
@@ -995,16 +1008,16 @@ struct net_device *rtnl_create_link(struct net *net, char *ifname,
         if (!dev)
                 goto err;
 
+        dev_net_set(dev, net);
+        dev->rtnl_link_ops = ops;
         dev->real_num_tx_queues = real_num_queues;
+
         if (strchr(dev->name, '%')) {
                 err = dev_alloc_name(dev, dev->name);
                 if (err < 0)
                         goto err_free;
         }
 
-        dev_net_set(dev, net);
-        dev->rtnl_link_ops = ops;
-
         if (tb[IFLA_MTU])
                 dev->mtu = nla_get_u32(tb[IFLA_MTU]);
         if (tb[IFLA_ADDRESS])
@@ -1083,6 +1096,7 @@ replay:
 
         if (1) {
                 struct nlattr *attr[ops ? ops->maxtype + 1 : 0], **data = NULL;
+                struct net *dest_net;
 
                 if (ops) {
                         if (ops->maxtype && linkinfo[IFLA_INFO_DATA]) {
@@ -1147,17 +1161,19 @@ replay:
                 if (!ifname[0])
                         snprintf(ifname, IFNAMSIZ, "%s%%d", ops->kind);
 
-                dev = rtnl_create_link(net, ifname, ops, tb);
+                dest_net = rtnl_link_get_net(net, tb);
+                dev = rtnl_create_link(net, dest_net, ifname, ops, tb);
 
                 if (IS_ERR(dev))
                         err = PTR_ERR(dev);
                 else if (ops->newlink)
-                        err = ops->newlink(dev, tb, data);
+                        err = ops->newlink(net, dev, tb, data);
                 else
                         err = register_netdevice(dev);
-
                 if (err < 0 && !IS_ERR(dev))
                         free_netdev(dev);
+
+                put_net(dest_net);
                 return err;
         }
 }
diff --git a/net/ipv4/ip_gre.c b/net/ipv4/ip_gre.c
index 71a3242fb7d0..a7de9e3a8f18 100644
--- a/net/ipv4/ip_gre.c
+++ b/net/ipv4/ip_gre.c
@@ -1483,7 +1483,7 @@ static void ipgre_tap_setup(struct net_device *dev)
         dev->features           |= NETIF_F_NETNS_LOCAL;
 }
 
-static int ipgre_newlink(struct net_device *dev, struct nlattr *tb[],
+static int ipgre_newlink(struct net *src_net, struct net_device *dev, struct nlattr *tb[],
                          struct nlattr *data[])
 {
         struct ip_tunnel *nt;