[PATCH 15/19] ip6_vti: not register vti_ipv6_handler twice

[Steffen Klassert]

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

An xfrm6_tunnel object is linked into the list when registering,
so vti_ipv6_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 xfrm6_tunnel object to register
for AF_INET.

Fixes: 2ab110cbb0c0 ("ip6_vti: support IP6IP tunnel processing")
Signed-off-by: Xin Long <lucien....@gmail.com>
Signed-off-by: Steffen Klassert <steffen.klass...@secunet.com>
---
 net/ipv6/ip6_vti.c | 13 ++++++++++---
 1 file changed, 10 insertions(+), 3 deletions(-)

diff --git a/net/ipv6/ip6_vti.c b/net/ipv6/ip6_vti.c
index dfa93bc857d2..18ec4ab45be7 100644
--- a/net/ipv6/ip6_vti.c
+++ b/net/ipv6/ip6_vti.c
@@ -1236,6 +1236,13 @@ static struct xfrm6_tunnel vti_ipv6_handler 
__read_mostly = {
        .err_handler    =       vti6_err,
        .priority       =       0,
 };
+
+static struct xfrm6_tunnel vti_ip6ip_handler __read_mostly = {
+       .handler        =       vti6_rcv_tunnel,
+       .cb_handler     =       vti6_rcv_cb,
+       .err_handler    =       vti6_err,
+       .priority       =       0,
+};
 #endif
 
 /**
@@ -1268,7 +1275,7 @@ static int __init vti6_tunnel_init(void)
        err = xfrm6_tunnel_register(&vti_ipv6_handler, AF_INET6);
        if (err < 0)
                goto vti_tunnel_ipv6_failed;
-       err = xfrm6_tunnel_register(&vti_ipv6_handler, AF_INET);
+       err = xfrm6_tunnel_register(&vti_ip6ip_handler, AF_INET);
        if (err < 0)
                goto vti_tunnel_ip6ip_failed;
 #endif
@@ -1282,7 +1289,7 @@ static int __init vti6_tunnel_init(void)
 
 rtnl_link_failed:
 #if IS_ENABLED(CONFIG_INET6_XFRM_TUNNEL)
-       err = xfrm6_tunnel_deregister(&vti_ipv6_handler, AF_INET);
+       err = xfrm6_tunnel_deregister(&vti_ip6ip_handler, AF_INET);
 vti_tunnel_ip6ip_failed:
        err = xfrm6_tunnel_deregister(&vti_ipv6_handler, AF_INET6);
 vti_tunnel_ipv6_failed:
@@ -1306,7 +1313,7 @@ static void __exit vti6_tunnel_cleanup(void)
 {
        rtnl_link_unregister(&vti6_link_ops);
 #if IS_ENABLED(CONFIG_INET6_XFRM_TUNNEL)
-       xfrm6_tunnel_deregister(&vti_ipv6_handler, AF_INET);
+       xfrm6_tunnel_deregister(&vti_ip6ip_handler, AF_INET);
        xfrm6_tunnel_deregister(&vti_ipv6_handler, AF_INET6);
 #endif
        xfrm6_protocol_deregister(&vti_ipcomp6_protocol, IPPROTO_COMP);
-- 
2.17.1