net: core: dev: Add extack argument to dev_change_flags()

In order to pass extack together with NETDEV_PRE_UP notifications, it's
necessary to route the extack to __dev_open() from diverse (possibly
indirect) callers. One prominent API through which the notification is
invoked is dev_change_flags().

Therefore extend dev_change_flags() with and extra extack argument and
update all users. Most of the calls end up just encoding NULL, but
several sites (VLAN, ipvlan, VRF, rtnetlink) do have extack available.

Since the function declaration line is changed anyway, name the other
function arguments to placate checkpatch.

Signed-off-by: Petr Machata <petrm@mellanox.com>
Acked-by: Jiri Pirko <jiri@mellanox.com>
Reviewed-by: Ido Schimmel <idosch@mellanox.com>
Reviewed-by: David Ahern <dsahern@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

4 files changed, 7 insertions, 4 deletions

diff --git a/net/core/dev.c b/net/core/dev.c
index b801c1aafd70..8bba6f98b545 100644
--- a/net/core/dev.c
+++ b/net/core/dev.c
@@ -7595,11 +7595,13 @@ void __dev_notify_flags(struct net_device *dev, unsigned int old_flags,
  *      dev_change_flags - change device settings
  *      @dev: device
  *      @flags: device state flags
+ *      @extack: netlink extended ack
  *
  *      Change settings on device based state flags. The flags are
  *      in the userspace exported format.
  */
-int dev_change_flags(struct net_device *dev, unsigned int flags)
+int dev_change_flags(struct net_device *dev, unsigned int flags,
+                     struct netlink_ext_ack *extack)
 {
         int ret;
         unsigned int changes, old_flags = dev->flags, old_gflags = dev->gflags;
diff --git a/net/core/dev_ioctl.c b/net/core/dev_ioctl.c
index 90e8aa36881e..da273ec3cc57 100644
--- a/net/core/dev_ioctl.c
+++ b/net/core/dev_ioctl.c
@@ -234,7 +234,7 @@ static int dev_ifsioc(struct net *net, struct ifreq *ifr, unsigned int cmd)
 
         switch (cmd) {
         case SIOCSIFFLAGS:      /* Set interface flags */
-                return dev_change_flags(dev, ifr->ifr_flags);
+                return dev_change_flags(dev, ifr->ifr_flags, NULL);
 
         case SIOCSIFMETRIC:     /* Set the metric on the interface
                                    (currently unused) */
diff --git a/net/core/net-sysfs.c b/net/core/net-sysfs.c
index bd67c4d0fcfd..ff9fd2bb4ce4 100644
--- a/net/core/net-sysfs.c
+++ b/net/core/net-sysfs.c
@@ -337,7 +337,7 @@ NETDEVICE_SHOW_RW(mtu, fmt_dec);
 
 static int change_flags(struct net_device *dev, unsigned long new_flags)
 {
-        return dev_change_flags(dev, (unsigned int)new_flags);
+        return dev_change_flags(dev, (unsigned int)new_flags, NULL);
 }
 
 static ssize_t flags_store(struct device *dev, struct device_attribute *attr,
diff --git a/net/core/rtnetlink.c b/net/core/rtnetlink.c
index 98876cd1e36c..4c9e4e187600 100644
--- a/net/core/rtnetlink.c
+++ b/net/core/rtnetlink.c
@@ -2489,7 +2489,8 @@ static int do_setlink(const struct sk_buff *skb,
         }
 
         if (ifm->ifi_flags || ifm->ifi_change) {
-                err = dev_change_flags(dev, rtnl_dev_combine_flags(dev, ifm));
+                err = dev_change_flags(dev, rtnl_dev_combine_flags(dev, ifm),
+                                       extack);
                 if (err < 0)
                         goto errout;
         }