netfilter: provide config option to disable ancient procfs parts

Using /proc/net/nf_conntrack has been deprecated in favour of the
conntrack(8) tool.
Signed-off-by: Jan Engelhardt <jengelh@medozas.de>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>

net/ipv4/netfilter/Kconfig

@@ -27,7 +27,7 @@ config NF_CONNTRACK_IPV4
 
 config NF_CONNTRACK_PROC_COMPAT
 	bool "proc/sysctl compatibility with old connection tracking"
-	depends on NF_CONNTRACK_IPV4
+	depends on NF_CONNTRACK_PROCFS && NF_CONNTRACK_IPV4
 	default y
 	help
 	  This option enables /proc and sysctl compatibility with the old

net/netfilter/Kconfig

@@ -83,6 +83,16 @@ config NF_CONNTRACK_ZONES
 
 	  If unsure, say `N'.
 
+config NF_CONNTRACK_PROCFS
+	bool "Supply CT list in procfs (OBSOLETE)"
+	default y
+	depends on PROC_FS
+	---help---
+	This option enables for the list of known conntrack entries
+	to be shown in procfs under net/netfilter/nf_conntrack. This
+	is considered obsolete in favor of using the conntrack(8)
+	tool which uses Netlink.
+
 config NF_CONNTRACK_EVENTS
 	bool "Connection tracking events"
 	depends on NETFILTER_ADVANCED

net/netfilter/nf_conntrack_expect.c

@@ -455,7 +455,7 @@ int nf_ct_expect_related_report(struct nf_conntrack_expect *expect,
 }
 EXPORT_SYMBOL_GPL(nf_ct_expect_related_report);
 
-#ifdef CONFIG_PROC_FS
+#ifdef CONFIG_NF_CONNTRACK_PROCFS
 struct ct_expect_iter_state {
 	struct seq_net_private p;
 	unsigned int bucket;
@@ -583,25 +583,25 @@ static const struct file_operations exp_file_ops = {
 	.llseek  = seq_lseek,
 	.release = seq_release_net,
 };
-#endif /* CONFIG_PROC_FS */
+#endif /* CONFIG_NF_CONNTRACK_PROCFS */
 
 static int exp_proc_init(struct net *net)
 {
-#ifdef CONFIG_PROC_FS
+#ifdef CONFIG_NF_CONNTRACK_PROCFS
 	struct proc_dir_entry *proc;
 
 	proc = proc_net_fops_create(net, "nf_conntrack_expect", 0440, &exp_file_ops);
 	if (!proc)
 		return -ENOMEM;
-#endif /* CONFIG_PROC_FS */
+#endif /* CONFIG_NF_CONNTRACK_PROCFS */
 	return 0;
 }
 
 static void exp_proc_remove(struct net *net)
 {
-#ifdef CONFIG_PROC_FS
+#ifdef CONFIG_NF_CONNTRACK_PROCFS
 	proc_net_remove(net, "nf_conntrack_expect");
-#endif /* CONFIG_PROC_FS */
+#endif /* CONFIG_NF_CONNTRACK_PROCFS */
 }
 
 module_param_named(expect_hashsize, nf_ct_expect_hsize, uint, 0400);

net/netfilter/nf_conntrack_standalone.c

@@ -34,7 +34,7 @@
 
 MODULE_LICENSE("GPL");
 
-#ifdef CONFIG_PROC_FS
+#ifdef CONFIG_NF_CONNTRACK_PROCFS
 int
 print_tuple(struct seq_file *s, const struct nf_conntrack_tuple *tuple,
             const struct nf_conntrack_l3proto *l3proto,
@@ -396,7 +396,7 @@ static int nf_conntrack_standalone_init_proc(struct net *net)
 static void nf_conntrack_standalone_fini_proc(struct net *net)
 {
 }
-#endif /* CONFIG_PROC_FS */
+#endif /* CONFIG_NF_CONNTRACK_PROCFS */
 
 /* Sysctl support */