rtnetlink: support specifying device flags on device creation

commit e8469ed959c373c2ff9e6f488aa5a14971aebe1f
Author: Patrick McHardy <kaber@trash.net>
Date:   Tue Feb 23 20:41:30 2010 +0100

Support specifying the initial device flags when creating a device though
rtnl_link. Devices allocated by rtnl_create_link() are marked as INITIALIZING
in order to surpress netlink registration notifications. To complete setup,
rtnl_configure_link() must be called, which performs the device flag changes
and invokes the deferred notifiers if everything went well.

Two examples:

# add macvlan to eth0
#
$ ip link add link eth0 up allmulticast on type macvlan

[LINK]11: macvlan0@eth0: <BROADCAST,MULTICAST,ALLMULTI,UP,LOWER_UP> mtu 1500 qdisc noqueue state UNKNOWN
    link/ether 26:f8:84:02:f9:2a brd ff:ff:ff:ff:ff:ff
[ROUTE]ff00::/8 dev macvlan0  table local  metric 256  mtu 1500 advmss 1440 hoplimit 0
[ROUTE]fe80::/64 dev macvlan0  proto kernel  metric 256  mtu 1500 advmss 1440 hoplimit 0
[LINK]11: macvlan0@eth0: <BROADCAST,MULTICAST,ALLMULTI,UP,LOWER_UP> mtu 1500
    link/ether 26:f8:84:02:f9:2a
[ADDR]11: macvlan0    inet6 fe80::24f8:84ff:fe02:f92a/64 scope link
       valid_lft forever preferred_lft forever
[ROUTE]local fe80::24f8:84ff:fe02:f92a via :: dev lo  table local  proto none  metric 0  mtu 16436 advmss 16376 hoplimit 0
[ROUTE]default via fe80::215:e9ff:fef0:10f8 dev macvlan0  proto kernel  metric 1024  mtu 1500 advmss 1440 hoplimit 0
[NEIGH]fe80::215:e9ff:fef0:10f8 dev macvlan0 lladdr 00:15:e9:f0:10:f8 router STALE
[ROUTE]2001:6f8:974::/64 dev macvlan0  proto kernel  metric 256  expires 0sec mtu 1500 advmss 1440 hoplimit 0
[PREFIX]prefix 2001:6f8:974::/64 dev macvlan0 onlink autoconf valid 14400 preferred 131084
[ADDR]11: macvlan0    inet6 2001:6f8:974:0:24f8:84ff:fe02:f92a/64 scope global dynamic
       valid_lft 86399sec preferred_lft 14399sec

# add VLAN to eth1, eth1 is down
#
$ ip link add link eth1 up type vlan id 1000
RTNETLINK answers: Network is down

<no events>

Signed-off-by: Patrick McHardy <kaber@trash.net>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 43 insertions, 9 deletions

diff --git a/net/core/rtnetlink.c b/net/core/rtnetlink.c
index c21ec4236dd0..d1472a423323 100644
--- a/net/core/rtnetlink.c
+++ b/net/core/rtnetlink.c
@@ -549,6 +549,19 @@ static void set_operstate(struct net_device *dev, unsigned char transition)
         }
 }
 
+static unsigned int rtnl_dev_combine_flags(const struct net_device *dev,
+                                           const struct ifinfomsg *ifm)
+{
+        unsigned int flags = ifm->ifi_flags;
+
+        /* bugwards compatibility: ifi_change == 0 is treated as ~0 */
+        if (ifm->ifi_change)
+                flags = (flags & ifm->ifi_change) |
+                        (dev->flags & ~ifm->ifi_change);
+
+        return flags;
+}
+
 static void copy_rtnl_link_stats(struct rtnl_link_stats *a,
                                  const struct net_device_stats *b)
 {
@@ -904,13 +917,7 @@ static int do_setlink(struct net_device *dev, struct ifinfomsg *ifm,
         }
 
         if (ifm->ifi_flags || ifm->ifi_change) {
-                unsigned int flags = ifm->ifi_flags;
-
-                /* bugwards compatibility: ifi_change == 0 is treated as ~0 */
-                if (ifm->ifi_change)
-                        flags = (flags & ifm->ifi_change) |
-                                (dev->flags & ~ifm->ifi_change);
-                err = dev_change_flags(dev, flags);
+                err = dev_change_flags(dev, rtnl_dev_combine_flags(dev, ifm));
                 if (err < 0)
                         goto errout;
         }
@@ -1053,6 +1060,26 @@ static int rtnl_dellink(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
         return 0;
 }
 
+int rtnl_configure_link(struct net_device *dev, const struct ifinfomsg *ifm)
+{
+        unsigned int old_flags;
+        int err;
+
+        old_flags = dev->flags;
+        if (ifm && (ifm->ifi_flags || ifm->ifi_change)) {
+                err = __dev_change_flags(dev, rtnl_dev_combine_flags(dev, ifm));
+                if (err < 0)
+                        return err;
+        }
+
+        dev->rtnl_link_state = RTNL_LINK_INITIALIZED;
+        rtmsg_ifinfo(RTM_NEWLINK, dev, ~0U);
+
+        __dev_notify_flags(dev, old_flags);
+        return 0;
+}
+EXPORT_SYMBOL(rtnl_configure_link);
+
 struct net_device *rtnl_create_link(struct net *src_net, struct net *net,
         char *ifname, const struct rtnl_link_ops *ops, struct nlattr *tb[])
 {
@@ -1074,6 +1101,7 @@ struct net_device *rtnl_create_link(struct net *src_net, struct net *net,
 
         dev_net_set(dev, net);
         dev->rtnl_link_ops = ops;
+        dev->rtnl_link_state = RTNL_LINK_INITIALIZING;
         dev->real_num_tx_queues = real_num_queues;
 
         if (strchr(dev->name, '%')) {
@@ -1203,7 +1231,7 @@ replay:
                 if (!(nlh->nlmsg_flags & NLM_F_CREATE))
                         return -ENODEV;
 
-                if (ifm->ifi_index || ifm->ifi_flags || ifm->ifi_change)
+                if (ifm->ifi_index)
                         return -EOPNOTSUPP;
                 if (tb[IFLA_MAP] || tb[IFLA_MASTER] || tb[IFLA_PROTINFO])
                         return -EOPNOTSUPP;
@@ -1234,9 +1262,15 @@ replay:
                         err = ops->newlink(net, dev, tb, data);
                 else
                         err = register_netdevice(dev);
-                if (err < 0 && !IS_ERR(dev))
+                if (err < 0 && !IS_ERR(dev)) {
                         free_netdev(dev);
+                        goto out;
+                }
 
+                err = rtnl_configure_link(dev, ifm);
+                if (err < 0)
+                        unregister_netdevice(dev);
+out:
                 put_net(dest_net);
                 return err;
         }