[PATCH 14/19] ip_vti: not register vti_ipip_handler twice

[Steffen Klassert]

From: Xin Long <lucien....@gmail.com>

An xfrm_tunnel object is linked into the list when registering,
so vti_ipip_handler can not be registered twice, otherwise its
next pointer will be overwritten on the second time.

So this patch is to define a new xfrm_tunnel object to register
for AF_INET6.

Fixes: e6ce64570f24 ("ip_vti: support IPIP6 tunnel processing")
Signed-off-by: Xin Long <lucien....@gmail.com>
Signed-off-by: Steffen Klassert <steffen.klass...@secunet.com>
---
 net/ipv4/ip_vti.c | 13 ++++++++++---
 1 file changed, 10 insertions(+), 3 deletions(-)

diff --git a/net/ipv4/ip_vti.c b/net/ipv4/ip_vti.c
index c0b97b8f6fbd..3e5d54517145 100644
--- a/net/ipv4/ip_vti.c
+++ b/net/ipv4/ip_vti.c
@@ -484,6 +484,13 @@ static struct xfrm_tunnel vti_ipip_handler __read_mostly = 
{
        .err_handler    =       vti4_err,
        .priority       =       0,
 };
+
+static struct xfrm_tunnel vti_ipip6_handler __read_mostly = {
+       .handler        =       vti_rcv_tunnel,
+       .cb_handler     =       vti_rcv_cb,
+       .err_handler    =       vti4_err,
+       .priority       =       0,
+};
 #endif
 
 static int __net_init vti_init_net(struct net *net)
@@ -660,7 +667,7 @@ static int __init vti_init(void)
        if (err < 0)
                goto xfrm_tunnel_ipip_failed;
 #if IS_ENABLED(CONFIG_IPV6)
-       err = xfrm4_tunnel_register(&vti_ipip_handler, AF_INET6);
+       err = xfrm4_tunnel_register(&vti_ipip6_handler, AF_INET6);
        if (err < 0)
                goto xfrm_tunnel_ipip6_failed;
 #endif
@@ -676,7 +683,7 @@ static int __init vti_init(void)
 rtnl_link_failed:
 #if IS_ENABLED(CONFIG_INET_XFRM_TUNNEL)
 #if IS_ENABLED(CONFIG_IPV6)
-       xfrm4_tunnel_deregister(&vti_ipip_handler, AF_INET6);
+       xfrm4_tunnel_deregister(&vti_ipip6_handler, AF_INET6);
 xfrm_tunnel_ipip6_failed:
 #endif
        xfrm4_tunnel_deregister(&vti_ipip_handler, AF_INET);
@@ -699,7 +706,7 @@ static void __exit vti_fini(void)
        rtnl_link_unregister(&vti_link_ops);
 #if IS_ENABLED(CONFIG_INET_XFRM_TUNNEL)
 #if IS_ENABLED(CONFIG_IPV6)
-       xfrm4_tunnel_deregister(&vti_ipip_handler, AF_INET6);
+       xfrm4_tunnel_deregister(&vti_ipip6_handler, AF_INET6);
 #endif
        xfrm4_tunnel_deregister(&vti_ipip_handler, AF_INET);
 #endif
-- 
2.17.1