netfilter: ipset: fix linking with CONFIG_IPV6=n

Add a dummy ip_set_get_ip6_port function that unconditionally
returns false for CONFIG_IPV6=n and convert the real function
to ipv6_skip_exthdr() to avoid pulling in the ip6_tables module
when loading ipset.

Signed-off-by: Patrick McHardy <kaber@trash.net>

1 files changed, 10 insertions, 0 deletions

diff --git a/include/linux/netfilter/ipset/ip_set_getport.h b/include/linux/netfilter/ipset/ip_set_getport.h
index 694c433298b8..3882a81a3b3c 100644
--- a/include/linux/netfilter/ipset/ip_set_getport.h
+++ b/include/linux/netfilter/ipset/ip_set_getport.h
@@ -3,8 +3,18 @@
 
 extern bool ip_set_get_ip4_port(const struct sk_buff *skb, bool src,
                                 __be16 *port, u8 *proto);
+
+#if defined(CONFIG_IP6_NF_IPTABLES) || defined(CONFIG_IP6_NF_IPTABLES_MODULE)
 extern bool ip_set_get_ip6_port(const struct sk_buff *skb, bool src,
                                 __be16 *port, u8 *proto);
+#else
+static inline bool ip_set_get_ip6_port(const struct sk_buff *skb, bool src,
+                                       __be16 *port, u8 *proto)
+{
+        return false;
+}
+#endif
+
 extern bool ip_set_get_ip_port(const struct sk_buff *skb, u8 pf, bool src,
                                 __be16 *port);