[PATCH net] geneve: only configure or fill UDP_ZERO_CSUM6_RX/TX info when CONFIG_IPV6

[Hangbin Liu]

Stefano pointed that configure or show UDP_ZERO_CSUM6_RX/TX info doesn't
make sense if we haven't enabled CONFIG_IPV6. Fix it by adding
if IS_ENABLED(CONFIG_IPV6) check.

Signed-off-by: Hangbin Liu <liuhang...@gmail.com>
---
 drivers/net/geneve.c | 16 +++++++++++++++-
 1 file changed, 15 insertions(+), 1 deletion(-)

diff --git a/drivers/net/geneve.c b/drivers/net/geneve.c
index 4e16d83..b718a02 100644
--- a/drivers/net/geneve.c
+++ b/drivers/net/geneve.c
@@ -1337,21 +1337,33 @@ static int geneve_nl2info(struct nlattr *tb[], struct 
nlattr *data[],
        }
 
        if (data[IFLA_GENEVE_UDP_ZERO_CSUM6_TX]) {
+#if IS_ENABLED(CONFIG_IPV6)
                if (changelink) {
                        attrtype = IFLA_GENEVE_UDP_ZERO_CSUM6_TX;
                        goto change_notsup;
                }
                if (nla_get_u8(data[IFLA_GENEVE_UDP_ZERO_CSUM6_TX]))
                        info->key.tun_flags &= ~TUNNEL_CSUM;
+#else
+               NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_UDP_ZERO_CSUM6_TX],
+                                   "IPv6 support not enabled in the kernel");
+               return -EPFNOSUPPORT;
+#endif
        }
 
        if (data[IFLA_GENEVE_UDP_ZERO_CSUM6_RX]) {
+#if IS_ENABLED(CONFIG_IPV6)
                if (changelink) {
                        attrtype = IFLA_GENEVE_UDP_ZERO_CSUM6_RX;
                        goto change_notsup;
                }
                if (nla_get_u8(data[IFLA_GENEVE_UDP_ZERO_CSUM6_RX]))
                        *use_udp6_rx_checksums = false;
+#else
+               NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_UDP_ZERO_CSUM6_RX],
+                                   "IPv6 support not enabled in the kernel");
+               return -EPFNOSUPPORT;
+#endif
        }
 
        return 0;
@@ -1527,11 +1539,13 @@ static int geneve_fill_info(struct sk_buff *skb, const 
struct net_device *dev)
                goto nla_put_failure;
 
        if (metadata && nla_put_flag(skb, IFLA_GENEVE_COLLECT_METADATA))
-                       goto nla_put_failure;
+               goto nla_put_failure;
 
+#if IS_ENABLED(CONFIG_IPV6)
        if (nla_put_u8(skb, IFLA_GENEVE_UDP_ZERO_CSUM6_RX,
                       !geneve->use_udp6_rx_checksums))
                goto nla_put_failure;
+#endif
 
        return 0;
 
-- 
2.5.5