[PATCH net-next 2/2] ip_gre: add the support for i/o_flags update via ioctl

[Xin Long]

As patch 'ip_gre: add the support for i/o_flags update via netlink'
did for netlink, we also need to do the same job for these update
via ioctl.

This patch is to update i/o_flags and call ipgre_link_update to
recalculate these gre properties after ip_tunnel_ioctl does the
common update.

Signed-off-by: Xin Long <lucien....@gmail.com>
---
 net/ipv4/ip_gre.c | 19 ++++++++++++++++---
 1 file changed, 16 insertions(+), 3 deletions(-)

diff --git a/net/ipv4/ip_gre.c b/net/ipv4/ip_gre.c
index 81e1e20..bb62391 100644
--- a/net/ipv4/ip_gre.c
+++ b/net/ipv4/ip_gre.c
@@ -800,17 +800,19 @@ static void ipgre_link_update(struct net_device *dev, 
bool set_mtu)
 static int ipgre_tunnel_ioctl(struct net_device *dev,
                              struct ifreq *ifr, int cmd)
 {
-       int err;
        struct ip_tunnel_parm p;
+       int err;
 
        if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p)))
                return -EFAULT;
+
        if (cmd == SIOCADDTUNNEL || cmd == SIOCCHGTUNNEL) {
                if (p.iph.version != 4 || p.iph.protocol != IPPROTO_GRE ||
-                   p.iph.ihl != 5 || (p.iph.frag_off&htons(~IP_DF)) ||
-                   ((p.i_flags|p.o_flags)&(GRE_VERSION|GRE_ROUTING)))
+                   p.iph.ihl != 5 || (p.iph.frag_off & htons(~IP_DF)) ||
+                   ((p.i_flags | p.o_flags) & (GRE_VERSION | GRE_ROUTING)))
                        return -EINVAL;
        }
+
        p.i_flags = gre_flags_to_tnl_flags(p.i_flags);
        p.o_flags = gre_flags_to_tnl_flags(p.o_flags);
 
@@ -818,11 +820,22 @@ static int ipgre_tunnel_ioctl(struct net_device *dev,
        if (err)
                return err;
 
+       if (cmd == SIOCCHGTUNNEL) {
+               struct ip_tunnel *t = netdev_priv(dev);
+
+               t->parms.i_flags = p.i_flags;
+               t->parms.o_flags = p.o_flags;
+
+               if (strcmp(dev->rtnl_link_ops->kind, "erspan"))
+                       ipgre_link_update(dev, true);
+       }
+
        p.i_flags = gre_tnl_flags_to_gre_flags(p.i_flags);
        p.o_flags = gre_tnl_flags_to_gre_flags(p.o_flags);
 
        if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof(p)))
                return -EFAULT;
+
        return 0;
 }
 
-- 
2.1.0