[NETFILTER]: nf_conntrack: sysctl compatibility with old connection tracking

This patch adds an option to keep the connection tracking sysctls visible
under their old names.

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

6 files changed, 240 insertions, 0 deletions

diff --git a/net/netfilter/nf_conntrack_core.c b/net/netfilter/nf_conntrack_core.c
index 4b972791149..a6728067780 100644
--- a/net/netfilter/nf_conntrack_core.c
+++ b/net/netfilter/nf_conntrack_core.c
@@ -66,10 +66,12 @@ DEFINE_RWLOCK(nf_conntrack_lock);
 
 /* nf_conntrack_standalone needs this */
 atomic_t nf_conntrack_count = ATOMIC_INIT(0);
+EXPORT_SYMBOL_GPL(nf_conntrack_count);
 
 void (*nf_conntrack_destroyed)(struct nf_conn *conntrack) = NULL;
 unsigned int nf_conntrack_htable_size __read_mostly;
 int nf_conntrack_max __read_mostly;
+EXPORT_SYMBOL_GPL(nf_conntrack_max);
 struct list_head *nf_conntrack_hash __read_mostly;
 struct nf_conn nf_conntrack_untracked __read_mostly;
 unsigned int nf_ct_log_invalid __read_mostly;
diff --git a/net/netfilter/nf_conntrack_proto.c b/net/netfilter/nf_conntrack_proto.c
index 891c9c56c31..4798afcbbb0 100644
--- a/net/netfilter/nf_conntrack_proto.c
+++ b/net/netfilter/nf_conntrack_proto.c
@@ -250,7 +250,22 @@ static int nf_ct_l4proto_register_sysctl(struct nf_conntrack_l4proto *l4proto)
 					    nf_net_netfilter_sysctl_path,
 					    l4proto->ctl_table,
 					    l4proto->ctl_table_users);
+		if (err < 0)
+			goto out;
 	}
+#ifdef CONFIG_NF_CONNTRACK_PROC_COMPAT
+	if (l4proto->ctl_compat_table != NULL) {
+		err = nf_ct_register_sysctl(&l4proto->ctl_compat_table_header,
+					    nf_net_ipv4_netfilter_sysctl_path,
+					    l4proto->ctl_compat_table, NULL);
+		if (err == 0)
+			goto out;
+		nf_ct_unregister_sysctl(l4proto->ctl_table_header,
+					l4proto->ctl_table,
+					l4proto->ctl_table_users);
+	}
+#endif /* CONFIG_NF_CONNTRACK_PROC_COMPAT */
+out:
 	mutex_unlock(&nf_ct_proto_sysctl_mutex);
 #endif /* CONFIG_SYSCTL */
 	return err;
@@ -265,6 +280,11 @@ static void nf_ct_l4proto_unregister_sysctl(struct nf_conntrack_l4proto *l4proto
 		nf_ct_unregister_sysctl(l4proto->ctl_table_header,
 					l4proto->ctl_table,
 					l4proto->ctl_table_users);
+#ifdef CONFIG_NF_CONNTRACK_PROC_COMPAT
+	if (l4proto->ctl_compat_table_header != NULL)
+		nf_ct_unregister_sysctl(&l4proto->ctl_compat_table_header,
+					l4proto->ctl_compat_table, NULL);
+#endif /* CONFIG_NF_CONNTRACK_PROC_COMPAT */
 	mutex_unlock(&nf_ct_proto_sysctl_mutex);
 #endif /* CONFIG_SYSCTL */
 }
diff --git a/net/netfilter/nf_conntrack_proto_generic.c b/net/netfilter/nf_conntrack_proto_generic.c
index 15306b95251..69902531c23 100644
--- a/net/netfilter/nf_conntrack_proto_generic.c
+++ b/net/netfilter/nf_conntrack_proto_generic.c
@@ -86,6 +86,21 @@ static struct ctl_table generic_sysctl_table[] = {
 		.ctl_name	= 0
 	}
 };
+#ifdef CONFIG_NF_CONNTRACK_PROC_COMPAT
+static struct ctl_table generic_compat_sysctl_table[] = {
+	{
+		.ctl_name	= NET_IPV4_NF_CONNTRACK_GENERIC_TIMEOUT,
+		.procname	= "ip_conntrack_generic_timeout",
+		.data		= &nf_ct_generic_timeout,
+		.maxlen		= sizeof(unsigned int),
+		.mode		= 0644,
+		.proc_handler	= &proc_dointvec_jiffies,
+	},
+	{
+		.ctl_name	= 0
+	}
+};
+#endif /* CONFIG_NF_CONNTRACK_PROC_COMPAT */
 #endif /* CONFIG_SYSCTL */
 
 struct nf_conntrack_l4proto nf_conntrack_l4proto_generic =
@@ -102,5 +117,8 @@ struct nf_conntrack_l4proto nf_conntrack_l4proto_generic =
 #ifdef CONFIG_SYSCTL
 	.ctl_table_header	= &generic_sysctl_header,
 	.ctl_table		= generic_sysctl_table,
+#ifdef CONFIG_NF_CONNTRACK_PROC_COMPAT
+	.ctl_compat_table	= generic_compat_sysctl_table,
+#endif
 #endif
 };
diff --git a/net/netfilter/nf_conntrack_proto_sctp.c b/net/netfilter/nf_conntrack_proto_sctp.c
index cc693308878..7c64b9c1cf4 100644
--- a/net/netfilter/nf_conntrack_proto_sctp.c
+++ b/net/netfilter/nf_conntrack_proto_sctp.c
@@ -573,6 +573,70 @@ static struct ctl_table sctp_sysctl_table[] = {
 		.ctl_name = 0
 	}
 };
+
+#ifdef CONFIG_NF_CONNTRACK_PROC_COMPAT
+static struct ctl_table sctp_compat_sysctl_table[] = {
+	{
+		.ctl_name	= NET_IPV4_NF_CONNTRACK_SCTP_TIMEOUT_CLOSED,
+		.procname	= "ip_conntrack_sctp_timeout_closed",
+		.data		= &nf_ct_sctp_timeout_closed,
+		.maxlen		= sizeof(unsigned int),
+		.mode		= 0644,
+		.proc_handler	= &proc_dointvec_jiffies,
+	},
+	{
+		.ctl_name	= NET_IPV4_NF_CONNTRACK_SCTP_TIMEOUT_COOKIE_WAIT,
+		.procname	= "ip_conntrack_sctp_timeout_cookie_wait",
+		.data		= &nf_ct_sctp_timeout_cookie_wait,
+		.maxlen		= sizeof(unsigned int),
+		.mode		= 0644,
+		.proc_handler	= &proc_dointvec_jiffies,
+	},
+	{
+		.ctl_name	= NET_IPV4_NF_CONNTRACK_SCTP_TIMEOUT_COOKIE_ECHOED,
+		.procname	= "ip_conntrack_sctp_timeout_cookie_echoed",
+		.data		= &nf_ct_sctp_timeout_cookie_echoed,
+		.maxlen		= sizeof(unsigned int),
+		.mode		= 0644,
+		.proc_handler	= &proc_dointvec_jiffies,
+	},
+	{
+		.ctl_name	= NET_IPV4_NF_CONNTRACK_SCTP_TIMEOUT_ESTABLISHED,
+		.procname	= "ip_conntrack_sctp_timeout_established",
+		.data		= &nf_ct_sctp_timeout_established,
+		.maxlen		= sizeof(unsigned int),
+		.mode		= 0644,
+		.proc_handler	= &proc_dointvec_jiffies,
+	},
+	{
+		.ctl_name	= NET_IPV4_NF_CONNTRACK_SCTP_TIMEOUT_SHUTDOWN_SENT,
+		.procname	= "ip_conntrack_sctp_timeout_shutdown_sent",
+		.data		= &nf_ct_sctp_timeout_shutdown_sent,
+		.maxlen		= sizeof(unsigned int),
+		.mode		= 0644,
+		.proc_handler	= &proc_dointvec_jiffies,
+	},
+	{
+		.ctl_name	= NET_IPV4_NF_CONNTRACK_SCTP_TIMEOUT_SHUTDOWN_RECD,
+		.procname	= "ip_conntrack_sctp_timeout_shutdown_recd",
+		.data		= &nf_ct_sctp_timeout_shutdown_recd,
+		.maxlen		= sizeof(unsigned int),
+		.mode		= 0644,
+		.proc_handler	= &proc_dointvec_jiffies,
+	},
+	{
+		.ctl_name	= NET_IPV4_NF_CONNTRACK_SCTP_TIMEOUT_SHUTDOWN_ACK_SENT,
+		.procname	= "ip_conntrack_sctp_timeout_shutdown_ack_sent",
+		.data		= &nf_ct_sctp_timeout_shutdown_ack_sent,
+		.maxlen		= sizeof(unsigned int),
+		.mode		= 0644,
+		.proc_handler	= &proc_dointvec_jiffies,
+	},
+	{
+		.ctl_name = 0
+	}
+};
+#endif /* CONFIG_NF_CONNTRACK_PROC_COMPAT */
 #endif
 
 struct nf_conntrack_l4proto nf_conntrack_l4proto_sctp4 = {
@@ -590,6 +654,9 @@ struct nf_conntrack_l4proto nf_conntrack_l4proto_sctp4 = {
 	.ctl_table_users	= &sctp_sysctl_table_users,
 	.ctl_table_header	= &sctp_sysctl_header,
 	.ctl_table		= sctp_sysctl_table,
+#ifdef CONFIG_NF_CONNTRACK_PROC_COMPAT
+	.ctl_compat_table	= sctp_compat_sysctl_table,
+#endif
 #endif
 };
 
diff --git a/net/netfilter/nf_conntrack_proto_tcp.c b/net/netfilter/nf_conntrack_proto_tcp.c
index 6f6f9a061e7..d99c7c4176d 100644
--- a/net/netfilter/nf_conntrack_proto_tcp.c
+++ b/net/netfilter/nf_conntrack_proto_tcp.c
@@ -1273,6 +1273,110 @@ static struct ctl_table tcp_sysctl_table[] = {
 		.ctl_name	= 0
 	}
 };
+
+#ifdef CONFIG_NF_CONNTRACK_PROC_COMPAT
+static struct ctl_table tcp_compat_sysctl_table[] = {
+	{
+		.ctl_name	= NET_IPV4_NF_CONNTRACK_TCP_TIMEOUT_SYN_SENT,
+		.procname	= "ip_conntrack_tcp_timeout_syn_sent",
+		.data		= &nf_ct_tcp_timeout_syn_sent,
+		.maxlen		= sizeof(unsigned int),
+		.mode		= 0644,
+		.proc_handler	= &proc_dointvec_jiffies,
+	},
+	{
+		.ctl_name	= NET_IPV4_NF_CONNTRACK_TCP_TIMEOUT_SYN_RECV,
+		.procname	= "ip_conntrack_tcp_timeout_syn_recv",
+		.data		= &nf_ct_tcp_timeout_syn_recv,
+		.maxlen		= sizeof(unsigned int),
+		.mode		= 0644,
+		.proc_handler	= &proc_dointvec_jiffies,
+	},
+	{
+		.ctl_name	= NET_IPV4_NF_CONNTRACK_TCP_TIMEOUT_ESTABLISHED,
+		.procname	= "ip_conntrack_tcp_timeout_established",
+		.data		= &nf_ct_tcp_timeout_established,
+		.maxlen		= sizeof(unsigned int),
+		.mode		= 0644,
+		.proc_handler	= &proc_dointvec_jiffies,
+	},
+	{
+		.ctl_name	= NET_IPV4_NF_CONNTRACK_TCP_TIMEOUT_FIN_WAIT,
+		.procname	= "ip_conntrack_tcp_timeout_fin_wait",
+		.data		= &nf_ct_tcp_timeout_fin_wait,
+		.maxlen		= sizeof(unsigned int),
+		.mode		= 0644,
+		.proc_handler	= &proc_dointvec_jiffies,
+	},
+	{
+		.ctl_name	= NET_IPV4_NF_CONNTRACK_TCP_TIMEOUT_CLOSE_WAIT,
+		.procname	= "ip_conntrack_tcp_timeout_close_wait",
+		.data		= &nf_ct_tcp_timeout_close_wait,
+		.maxlen		= sizeof(unsigned int),
+		.mode		= 0644,
+		.proc_handler	= &proc_dointvec_jiffies,
+	},
+	{
+		.ctl_name	= NET_IPV4_NF_CONNTRACK_TCP_TIMEOUT_LAST_ACK,
+		.procname	= "ip_conntrack_tcp_timeout_last_ack",
+		.data		= &nf_ct_tcp_timeout_last_ack,
+		.maxlen		= sizeof(unsigned int),
+		.mode		= 0644,
+		.proc_handler	= &proc_dointvec_jiffies,
+	},
+	{
+		.ctl_name	= NET_IPV4_NF_CONNTRACK_TCP_TIMEOUT_TIME_WAIT,
+		.procname	= "ip_conntrack_tcp_timeout_time_wait",
+		.data		= &nf_ct_tcp_timeout_time_wait,
+		.maxlen		= sizeof(unsigned int),
+		.mode		= 0644,
+		.proc_handler	= &proc_dointvec_jiffies,
+	},
+	{
+		.ctl_name	= NET_IPV4_NF_CONNTRACK_TCP_TIMEOUT_CLOSE,
+		.procname	= "ip_conntrack_tcp_timeout_close",
+		.data		= &nf_ct_tcp_timeout_close,
+		.maxlen		= sizeof(unsigned int),
+		.mode		= 0644,
+		.proc_handler	= &proc_dointvec_jiffies,
+	},
+	{
+		.ctl_name	= NET_IPV4_NF_CONNTRACK_TCP_TIMEOUT_MAX_RETRANS,
+		.procname	= "ip_conntrack_tcp_timeout_max_retrans",
+		.data		= &nf_ct_tcp_timeout_max_retrans,
+		.maxlen		= sizeof(unsigned int),
+		.mode		= 0644,
+		.proc_handler	= &proc_dointvec_jiffies,
+	},
+	{
+		.ctl_name	= NET_IPV4_NF_CONNTRACK_TCP_LOOSE,
+		.procname	= "ip_conntrack_tcp_loose",
+		.data		= &nf_ct_tcp_loose,
+		.maxlen		= sizeof(unsigned int),
+		.mode		= 0644,
+		.proc_handler	= &proc_dointvec,
+	},
+	{
+		.ctl_name	= NET_IPV4_NF_CONNTRACK_TCP_BE_LIBERAL,
+		.procname	= "ip_conntrack_tcp_be_liberal",
+		.data		= &nf_ct_tcp_be_liberal,
+		.maxlen		= sizeof(unsigned int),
+		.mode		= 0644,
+		.proc_handler	= &proc_dointvec,
+	},
+	{
+		.ctl_name	= NET_IPV4_NF_CONNTRACK_TCP_MAX_RETRANS,
+		.procname	= "ip_conntrack_tcp_max_retrans",
+		.data		= &nf_ct_tcp_max_retrans,
+		.maxlen		= sizeof(unsigned int),
+		.mode		= 0644,
+		.proc_handler	= &proc_dointvec,
+	},
+	{
+		.ctl_name	= 0
+	}
+};
+#endif /* CONFIG_NF_CONNTRACK_PROC_COMPAT */
 #endif /* CONFIG_SYSCTL */
 
 struct nf_conntrack_l4proto nf_conntrack_l4proto_tcp4 =
@@ -1298,6 +1402,9 @@ struct nf_conntrack_l4proto nf_conntrack_l4proto_tcp4 =
 	.ctl_table_users	= &tcp_sysctl_table_users,
 	.ctl_table_header	= &tcp_sysctl_header,
 	.ctl_table		= tcp_sysctl_table,
+#ifdef CONFIG_NF_CONNTRACK_PROC_COMPAT
+	.ctl_compat_table	= tcp_compat_sysctl_table,
+#endif
 #endif
 };
 
diff --git a/net/netfilter/nf_conntrack_proto_udp.c b/net/netfilter/nf_conntrack_proto_udp.c
index d86749cb4a4..908fde7719f 100644
--- a/net/netfilter/nf_conntrack_proto_udp.c
+++ b/net/netfilter/nf_conntrack_proto_udp.c
@@ -172,6 +172,29 @@ static struct ctl_table udp_sysctl_table[] = {
 		.ctl_name	= 0
 	}
 };
+#ifdef CONFIG_NF_CONNTRACK_PROC_COMPAT
+static struct ctl_table udp_compat_sysctl_table[] = {
+	{
+		.ctl_name	= NET_IPV4_NF_CONNTRACK_UDP_TIMEOUT,
+		.procname	= "ip_conntrack_udp_timeout",
+		.data		= &nf_ct_udp_timeout,
+		.maxlen		= sizeof(unsigned int),
+		.mode		= 0644,
+		.proc_handler	= &proc_dointvec_jiffies,
+	},
+	{
+		.ctl_name	= NET_IPV4_NF_CONNTRACK_UDP_TIMEOUT_STREAM,
+		.procname	= "ip_conntrack_udp_timeout_stream",
+		.data		= &nf_ct_udp_timeout_stream,
+		.maxlen		= sizeof(unsigned int),
+		.mode		= 0644,
+		.proc_handler	= &proc_dointvec_jiffies,
+	},
+	{
+		.ctl_name	= 0
+	}
+};
+#endif /* CONFIG_NF_CONNTRACK_PROC_COMPAT */
 #endif /* CONFIG_SYSCTL */
 
 struct nf_conntrack_l4proto nf_conntrack_l4proto_udp4 =
@@ -195,6 +218,9 @@ struct nf_conntrack_l4proto nf_conntrack_l4proto_udp4 =
 	.ctl_table_users	= &udp_sysctl_table_users,
 	.ctl_table_header	= &udp_sysctl_header,
 	.ctl_table		= udp_sysctl_table,
+#ifdef CONFIG_NF_CONNTRACK_PROC_COMPAT
+	.ctl_compat_table	= udp_compat_sysctl_table,
+#endif
 #endif
 };