[PATCH 4.16 025/161] net: ip6_gre: Split up ip6gre_tnl_change()

[Greg Kroah-Hartman]

4.16-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Petr Machata <pe...@mellanox.com>

[ Upstream commit a6465350ef495f5cbd76a3e505d25a01d648477e ]

Split a reusable function ip6gre_tnl_copy_tnl_parm() from
ip6gre_tnl_change(). This will allow ERSPAN-specific code to
reuse the common parts while customizing the behavior for ERSPAN.

Fixes: 5a963eb61b7c ("ip6_gre: Add ERSPAN native tunnel support")
Signed-off-by: Petr Machata <pe...@mellanox.com>
Acked-by: William Tu <u9012...@gmail.com>
Signed-off-by: David S. Miller <da...@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gre...@linuxfoundation.org>
---
 net/ipv6/ip6_gre.c |   10 ++++++++--
 1 file changed, 8 insertions(+), 2 deletions(-)

--- a/net/ipv6/ip6_gre.c
+++ b/net/ipv6/ip6_gre.c
@@ -1106,8 +1106,8 @@ static void ip6gre_tnl_link_config(struc
        ip6gre_tnl_link_config_route(t, set_mtu, ip6gre_calc_hlen(t));
 }
 
-static int ip6gre_tnl_change(struct ip6_tnl *t,
-       const struct __ip6_tnl_parm *p, int set_mtu)
+static void ip6gre_tnl_copy_tnl_parm(struct ip6_tnl *t,
+                                    const struct __ip6_tnl_parm *p)
 {
        t->parms.laddr = p->laddr;
        t->parms.raddr = p->raddr;
@@ -1123,6 +1123,12 @@ static int ip6gre_tnl_change(struct ip6_
        t->parms.o_flags = p->o_flags;
        t->parms.fwmark = p->fwmark;
        dst_cache_reset(&t->dst_cache);
+}
+
+static int ip6gre_tnl_change(struct ip6_tnl *t, const struct __ip6_tnl_parm *p,
+                            int set_mtu)
+{
+       ip6gre_tnl_copy_tnl_parm(t, p);
        ip6gre_tnl_link_config(t, set_mtu);
        return 0;
 }