[NETFILTER]: x_tables: error if ip_conntrack is asked to handle IPv6 packets

To do that, this makes nf_ct_l3proto_try_module_{get,put} compatible
functions. As a result we can remove '#ifdef' surrounds and direct call of
need_conntrack().

Signed-off-by: Yasuyuki Kozakai <[e-mail]>
Signed-off-by: Patrick McHardy <[e-mail]>
Signed-off-by: David S. Miller <[e-mail]>

include/net/netfilter/nf_conntrack_compat.h

···
 	return (ct != NULL);
 }
 
+static inline int nf_ct_l3proto_try_module_get(unsigned short l3proto)
+{
+	need_conntrack();
+	return l3proto == PF_INET ? 0 : -1;
+}
+
+static inline void nf_ct_l3proto_module_put(unsigned short l3proto)
+{
+}
+
 #else /* CONFIG_IP_NF_CONNTRACK */
 
 #include <net/netfilter/ipv4/nf_conntrack_ipv4.h>

net/netfilter/xt_connmark.c

···
 		printk(KERN_WARNING "connmark: only support 32bit mark\n");
 		return 0;
 	}
-#if defined(CONFIG_NF_CONNTRACK) || defined(CONFIG_NF_CONNTRACK_MODULE)
 	if (nf_ct_l3proto_try_module_get(match->family) < 0) {
-		printk(KERN_WARNING "can't load nf_conntrack support for "
+		printk(KERN_WARNING "can't load conntrack support for "
 				    "proto=%d\n", match->family);
 		return 0;
 	}
-#endif
 	return 1;
 }
 
 static void
 destroy(const struct xt_match *match, void *matchinfo)
 {
-#if defined(CONFIG_NF_CONNTRACK) || defined(CONFIG_NF_CONNTRACK_MODULE)
 	nf_ct_l3proto_module_put(match->family);
-#endif
 }
 
 #ifdef CONFIG_COMPAT
···
 
 static int __init xt_connmark_init(void)
 {
-	need_conntrack();
 	return xt_register_matches(xt_connmark_match,
 				   ARRAY_SIZE(xt_connmark_match));
 }

net/netfilter/xt_conntrack.c

···
 
 #include <linux/netfilter/x_tables.h>
 #include <linux/netfilter/xt_conntrack.h>
+#include <net/netfilter/nf_conntrack_compat.h>
 
 MODULE_LICENSE("GPL");
 MODULE_AUTHOR("Marc Boucher <[e-mail]>");
···
 	   void *matchinfo,
 	   unsigned int hook_mask)
 {
-#if defined(CONFIG_NF_CONNTRACK) || defined(CONFIG_NF_CONNTRACK_MODULE)
 	if (nf_ct_l3proto_try_module_get(match->family) < 0) {
-		printk(KERN_WARNING "can't load nf_conntrack support for "
+		printk(KERN_WARNING "can't load conntrack support for "
 				    "proto=%d\n", match->family);
 		return 0;
 	}
-#endif
 	return 1;
 }
 
 static void destroy(const struct xt_match *match, void *matchinfo)
 {
-#if defined(CONFIG_NF_CONNTRACK) || defined(CONFIG_NF_CONNTRACK_MODULE)
 	nf_ct_l3proto_module_put(match->family);
-#endif
 }
 
 static struct xt_match conntrack_match = {
···
 
 static int __init xt_conntrack_init(void)
 {
-	need_conntrack();
 	return xt_register_match(&conntrack_match);
 }
 

net/netfilter/xt_helper.c

···
 #endif
 #include <linux/netfilter/x_tables.h>
 #include <linux/netfilter/xt_helper.h>
+#include <net/netfilter/nf_conntrack_compat.h>
 
 MODULE_LICENSE("GPL");
 MODULE_AUTHOR("Martin Josefsson <[e-mail]>");
···
 {
 	struct xt_helper_info *info = matchinfo;
 
-#if defined(CONFIG_NF_CONNTRACK) || defined(CONFIG_NF_CONNTRACK_MODULE)
 	if (nf_ct_l3proto_try_module_get(match->family) < 0) {
-		printk(KERN_WARNING "can't load nf_conntrack support for "
+		printk(KERN_WARNING "can't load conntrack support for "
 				    "proto=%d\n", match->family);
 		return 0;
 	}
-#endif
 	info->name[29] = '\0';
 	return 1;
 }
···
 static void
 destroy(const struct xt_match *match, void *matchinfo)
 {
-#if defined(CONFIG_NF_CONNTRACK) || defined(CONFIG_NF_CONNTRACK_MODULE)
 	nf_ct_l3proto_module_put(match->family);
-#endif
 }
 
 static struct xt_match xt_helper_match[] = {
···
 
 static int __init xt_helper_init(void)
 {
-	need_conntrack();
 	return xt_register_matches(xt_helper_match,
 				   ARRAY_SIZE(xt_helper_match));
 }

net/netfilter/xt_state.c

···
 		 void *matchinfo,
 		 unsigned int hook_mask)
 {
-#if defined(CONFIG_NF_CONNTRACK) || defined(CONFIG_NF_CONNTRACK_MODULE)
 	if (nf_ct_l3proto_try_module_get(match->family) < 0) {
-		printk(KERN_WARNING "can't load nf_conntrack support for "
+		printk(KERN_WARNING "can't load conntrack support for "
 				    "proto=%d\n", match->family);
 		return 0;
 	}
-#endif
 	return 1;
 }
 
 static void
 destroy(const struct xt_match *match, void *matchinfo)
 {
-#if defined(CONFIG_NF_CONNTRACK) || defined(CONFIG_NF_CONNTRACK_MODULE)
 	nf_ct_l3proto_module_put(match->family);
-#endif
 }
 
 static struct xt_match xt_state_match[] = {
···
 
 static int __init xt_state_init(void)
 {
-	need_conntrack();
 	return xt_register_matches(xt_state_match, ARRAY_SIZE(xt_state_match));
 }