kernel: remove the netfilter optimization that skips the filter table, it has caused too many issues

Signed-off-by: Felix Fietkau <nbd@openwrt.org>

SVN-Revision: 44873

package/base-files/files/etc/sysctl.conf

@@ -22,7 +22,6 @@ net.netfilter.nf_conntrack_max=16384
 net.netfilter.nf_conntrack_tcp_timeout_established=7440
 net.netfilter.nf_conntrack_udp_timeout=60
 net.netfilter.nf_conntrack_udp_timeout_stream=180
-net.netfilter.nf_conntrack_skip_filter=1
 
 # disable bridge firewalling by default
 net.bridge.bridge-nf-call-arptables=0

target/linux/generic/patches-3.10/617-netfilter_skip_filter_sysctl.patch

@@ -1,87 +0,0 @@
---- a/include/net/netns/conntrack.h
-+++ b/include/net/netns/conntrack.h
-@@ -80,6 +80,7 @@ struct netns_ct {
- 	int			sysctl_acct;
- 	int			sysctl_tstamp;
- 	int			sysctl_checksum;
-+	int			skip_filter;
- 	unsigned int		sysctl_log_invalid; /* Log invalid packets */
- 	int			sysctl_auto_assign_helper;
- 	bool			auto_assign_helper_warned;
---- a/net/ipv4/netfilter/iptable_filter.c
-+++ b/net/ipv4/netfilter/iptable_filter.c
-@@ -15,6 +15,7 @@
- #include <linux/netfilter_ipv4/ip_tables.h>
- #include <linux/slab.h>
- #include <net/ip.h>
-+#include <net/netfilter/nf_conntrack.h>
- 
- MODULE_LICENSE("GPL");
- MODULE_AUTHOR("Netfilter Core Team <coreteam@netfilter.org>");
-@@ -37,6 +38,7 @@ iptable_filter_hook(unsigned int hook, s
- 		    const struct net_device *in, const struct net_device *out,
- 		    int (*okfn)(struct sk_buff *))
- {
-+	enum ip_conntrack_info ctinfo;
- 	const struct net *net;
- 
- 	if (hook == NF_INET_LOCAL_OUT &&
-@@ -46,6 +48,11 @@ iptable_filter_hook(unsigned int hook, s
- 		return NF_ACCEPT;
- 
- 	net = dev_net((in != NULL) ? in : out);
-+	nf_ct_get(skb, &ctinfo);
-+	if ((ctinfo == IP_CT_ESTABLISHED_REPLY || ctinfo == IP_CT_ESTABLISHED) &&
-+	    net->ct.skip_filter)
-+	    return NF_ACCEPT;
-+
- 	return ipt_do_table(skb, hook, in, out, net->ipv4.iptable_filter);
- }
- 
---- a/net/ipv6/netfilter/ip6table_filter.c
-+++ b/net/ipv6/netfilter/ip6table_filter.c
-@@ -13,6 +13,7 @@
- #include <linux/moduleparam.h>
- #include <linux/netfilter_ipv6/ip6_tables.h>
- #include <linux/slab.h>
-+#include <net/netfilter/nf_conntrack.h>
- 
- MODULE_LICENSE("GPL");
- MODULE_AUTHOR("Netfilter Core Team <coreteam@netfilter.org>");
-@@ -37,6 +38,12 @@ ip6table_filter_hook(unsigned int hook, 
- 		     int (*okfn)(struct sk_buff *))
- {
- 	const struct net *net = dev_net((in != NULL) ? in : out);
-+	enum ip_conntrack_info ctinfo;
-+
-+	nf_ct_get(skb, &ctinfo);
-+	if ((ctinfo == IP_CT_ESTABLISHED_REPLY || ctinfo == IP_CT_ESTABLISHED) &&
-+	    net->ct.skip_filter)
-+	    return NF_ACCEPT;
- 
- 	return ip6t_do_table(skb, hook, in, out, net->ipv6.ip6table_filter);
- }
---- a/net/netfilter/nf_conntrack_standalone.c
-+++ b/net/netfilter/nf_conntrack_standalone.c
-@@ -510,6 +510,13 @@ static ctl_table nf_ct_sysctl_table[] = 
- 		.extra2		= &log_invalid_proto_max,
- 	},
- 	{
-+		.procname	= "nf_conntrack_skip_filter",
-+		.data		= &init_net.ct.skip_filter,
-+		.maxlen		= sizeof(int),
-+		.mode		= 0644,
-+		.proc_handler	= proc_dointvec,
-+	},
-+	{
- 		.procname	= "nf_conntrack_expect_max",
- 		.data		= &nf_ct_expect_max,
- 		.maxlen		= sizeof(int),
-@@ -545,6 +552,7 @@ static int nf_conntrack_standalone_init_
- 	table[2].data = &net->ct.htable_size;
- 	table[3].data = &net->ct.sysctl_checksum;
- 	table[4].data = &net->ct.sysctl_log_invalid;
-+	table[5].data = &net->ct.skip_filter;
- 
- 	/* Don't export sysctls to unprivileged users */
- 	if (net->user_ns != &init_user_ns)

target/linux/generic/patches-3.14/617-netfilter_skip_filter_sysctl.patch

@@ -1,87 +0,0 @@
---- a/include/net/netns/conntrack.h
-+++ b/include/net/netns/conntrack.h
-@@ -73,6 +73,7 @@ struct netns_ct {
- 	struct ctl_table_header	*helper_sysctl_header;
- #endif
- 	char			*slabname;
-+	int			skip_filter;
- 	unsigned int		sysctl_log_invalid; /* Log invalid packets */
- 	unsigned int		sysctl_events_retry_timeout;
- 	int			sysctl_events;
---- a/net/ipv4/netfilter/iptable_filter.c
-+++ b/net/ipv4/netfilter/iptable_filter.c
-@@ -15,6 +15,7 @@
- #include <linux/netfilter_ipv4/ip_tables.h>
- #include <linux/slab.h>
- #include <net/ip.h>
-+#include <net/netfilter/nf_conntrack.h>
- 
- MODULE_LICENSE("GPL");
- MODULE_AUTHOR("Netfilter Core Team <coreteam@netfilter.org>");
-@@ -37,6 +38,7 @@ iptable_filter_hook(const struct nf_hook
- 		    const struct net_device *in, const struct net_device *out,
- 		    int (*okfn)(struct sk_buff *))
- {
-+	enum ip_conntrack_info ctinfo;
- 	const struct net *net;
- 
- 	if (ops->hooknum == NF_INET_LOCAL_OUT &&
-@@ -46,6 +48,11 @@ iptable_filter_hook(const struct nf_hook
- 		return NF_ACCEPT;
- 
- 	net = dev_net((in != NULL) ? in : out);
-+	nf_ct_get(skb, &ctinfo);
-+	if ((ctinfo == IP_CT_ESTABLISHED_REPLY || ctinfo == IP_CT_ESTABLISHED) &&
-+	    net->ct.skip_filter)
-+	    return NF_ACCEPT;
-+
- 	return ipt_do_table(skb, ops->hooknum, in, out,
- 			    net->ipv4.iptable_filter);
- }
---- a/net/ipv6/netfilter/ip6table_filter.c
-+++ b/net/ipv6/netfilter/ip6table_filter.c
-@@ -13,6 +13,7 @@
- #include <linux/moduleparam.h>
- #include <linux/netfilter_ipv6/ip6_tables.h>
- #include <linux/slab.h>
-+#include <net/netfilter/nf_conntrack.h>
- 
- MODULE_LICENSE("GPL");
- MODULE_AUTHOR("Netfilter Core Team <coreteam@netfilter.org>");
-@@ -37,6 +38,12 @@ ip6table_filter_hook(const struct nf_hoo
- 		     int (*okfn)(struct sk_buff *))
- {
- 	const struct net *net = dev_net((in != NULL) ? in : out);
-+	enum ip_conntrack_info ctinfo;
-+
-+	nf_ct_get(skb, &ctinfo);
-+	if ((ctinfo == IP_CT_ESTABLISHED_REPLY || ctinfo == IP_CT_ESTABLISHED) &&
-+	    net->ct.skip_filter)
-+	    return NF_ACCEPT;
- 
- 	return ip6t_do_table(skb, ops->hooknum, in, out,
- 			     net->ipv6.ip6table_filter);
---- a/net/netfilter/nf_conntrack_standalone.c
-+++ b/net/netfilter/nf_conntrack_standalone.c
-@@ -510,6 +510,13 @@ static struct ctl_table nf_ct_sysctl_tab
- 		.extra2		= &log_invalid_proto_max,
- 	},
- 	{
-+		.procname	= "nf_conntrack_skip_filter",
-+		.data		= &init_net.ct.skip_filter,
-+		.maxlen		= sizeof(int),
-+		.mode		= 0644,
-+		.proc_handler	= proc_dointvec,
-+	},
-+	{
- 		.procname	= "nf_conntrack_expect_max",
- 		.data		= &nf_ct_expect_max,
- 		.maxlen		= sizeof(int),
-@@ -545,6 +552,7 @@ static int nf_conntrack_standalone_init_
- 	table[2].data = &net->ct.htable_size;
- 	table[3].data = &net->ct.sysctl_checksum;
- 	table[4].data = &net->ct.sysctl_log_invalid;
-+	table[5].data = &net->ct.skip_filter;
- 
- 	/* Don't export sysctls to unprivileged users */
- 	if (net->user_ns != &init_user_ns)

target/linux/generic/patches-3.18/617-netfilter_skip_filter_sysctl.patch

@@ -1,87 +0,0 @@
---- a/include/net/netns/conntrack.h
-+++ b/include/net/netns/conntrack.h
-@@ -86,6 +86,7 @@ struct netns_ct {
- 	struct ctl_table_header	*helper_sysctl_header;
- #endif
- 	char			*slabname;
-+	int			skip_filter;
- 	unsigned int		sysctl_log_invalid; /* Log invalid packets */
- 	int			sysctl_events;
- 	int			sysctl_acct;
---- a/net/ipv4/netfilter/iptable_filter.c
-+++ b/net/ipv4/netfilter/iptable_filter.c
-@@ -15,6 +15,7 @@
- #include <linux/netfilter_ipv4/ip_tables.h>
- #include <linux/slab.h>
- #include <net/ip.h>
-+#include <net/netfilter/nf_conntrack.h>
- 
- MODULE_LICENSE("GPL");
- MODULE_AUTHOR("Netfilter Core Team <coreteam@netfilter.org>");
-@@ -37,6 +38,7 @@ iptable_filter_hook(const struct nf_hook
- 		    const struct net_device *in, const struct net_device *out,
- 		    int (*okfn)(struct sk_buff *))
- {
-+	enum ip_conntrack_info ctinfo;
- 	const struct net *net;
- 
- 	if (ops->hooknum == NF_INET_LOCAL_OUT &&
-@@ -46,6 +48,11 @@ iptable_filter_hook(const struct nf_hook
- 		return NF_ACCEPT;
- 
- 	net = dev_net((in != NULL) ? in : out);
-+	nf_ct_get(skb, &ctinfo);
-+	if ((ctinfo == IP_CT_ESTABLISHED_REPLY || ctinfo == IP_CT_ESTABLISHED) &&
-+	    net->ct.skip_filter)
-+	    return NF_ACCEPT;
-+
- 	return ipt_do_table(skb, ops->hooknum, in, out,
- 			    net->ipv4.iptable_filter);
- }
---- a/net/ipv6/netfilter/ip6table_filter.c
-+++ b/net/ipv6/netfilter/ip6table_filter.c
-@@ -13,6 +13,7 @@
- #include <linux/moduleparam.h>
- #include <linux/netfilter_ipv6/ip6_tables.h>
- #include <linux/slab.h>
-+#include <net/netfilter/nf_conntrack.h>
- 
- MODULE_LICENSE("GPL");
- MODULE_AUTHOR("Netfilter Core Team <coreteam@netfilter.org>");
-@@ -37,6 +38,12 @@ ip6table_filter_hook(const struct nf_hoo
- 		     int (*okfn)(struct sk_buff *))
- {
- 	const struct net *net = dev_net((in != NULL) ? in : out);
-+	enum ip_conntrack_info ctinfo;
-+
-+	nf_ct_get(skb, &ctinfo);
-+	if ((ctinfo == IP_CT_ESTABLISHED_REPLY || ctinfo == IP_CT_ESTABLISHED) &&
-+	    net->ct.skip_filter)
-+	    return NF_ACCEPT;
- 
- 	return ip6t_do_table(skb, ops->hooknum, in, out,
- 			     net->ipv6.ip6table_filter);
---- a/net/netfilter/nf_conntrack_standalone.c
-+++ b/net/netfilter/nf_conntrack_standalone.c
-@@ -510,6 +510,13 @@ static struct ctl_table nf_ct_sysctl_tab
- 		.extra2		= &log_invalid_proto_max,
- 	},
- 	{
-+		.procname	= "nf_conntrack_skip_filter",
-+		.data		= &init_net.ct.skip_filter,
-+		.maxlen		= sizeof(int),
-+		.mode		= 0644,
-+		.proc_handler	= proc_dointvec,
-+	},
-+	{
- 		.procname	= "nf_conntrack_expect_max",
- 		.data		= &nf_ct_expect_max,
- 		.maxlen		= sizeof(int),
-@@ -545,6 +552,7 @@ static int nf_conntrack_standalone_init_
- 	table[2].data = &net->ct.htable_size;
- 	table[3].data = &net->ct.sysctl_checksum;
- 	table[4].data = &net->ct.sysctl_log_invalid;
-+	table[5].data = &net->ct.skip_filter;
- 
- 	/* Don't export sysctls to unprivileged users */
- 	if (net->user_ns != &init_user_ns)

target/linux/generic/patches-3.19/617-netfilter_skip_filter_sysctl.patch

@@ -1,87 +0,0 @@
---- a/include/net/netns/conntrack.h
-+++ b/include/net/netns/conntrack.h
-@@ -86,6 +86,7 @@ struct netns_ct {
- 	struct ctl_table_header	*helper_sysctl_header;
- #endif
- 	char			*slabname;
-+	int			skip_filter;
- 	unsigned int		sysctl_log_invalid; /* Log invalid packets */
- 	int			sysctl_events;
- 	int			sysctl_acct;
---- a/net/ipv4/netfilter/iptable_filter.c
-+++ b/net/ipv4/netfilter/iptable_filter.c
-@@ -15,6 +15,7 @@
- #include <linux/netfilter_ipv4/ip_tables.h>
- #include <linux/slab.h>
- #include <net/ip.h>
-+#include <net/netfilter/nf_conntrack.h>
- 
- MODULE_LICENSE("GPL");
- MODULE_AUTHOR("Netfilter Core Team <coreteam@netfilter.org>");
-@@ -37,6 +38,7 @@ iptable_filter_hook(const struct nf_hook
- 		    const struct net_device *in, const struct net_device *out,
- 		    int (*okfn)(struct sk_buff *))
- {
-+	enum ip_conntrack_info ctinfo;
- 	const struct net *net;
- 
- 	if (ops->hooknum == NF_INET_LOCAL_OUT &&
-@@ -46,6 +48,11 @@ iptable_filter_hook(const struct nf_hook
- 		return NF_ACCEPT;
- 
- 	net = dev_net((in != NULL) ? in : out);
-+	nf_ct_get(skb, &ctinfo);
-+	if ((ctinfo == IP_CT_ESTABLISHED_REPLY || ctinfo == IP_CT_ESTABLISHED) &&
-+	    net->ct.skip_filter)
-+	    return NF_ACCEPT;
-+
- 	return ipt_do_table(skb, ops->hooknum, in, out,
- 			    net->ipv4.iptable_filter);
- }
---- a/net/ipv6/netfilter/ip6table_filter.c
-+++ b/net/ipv6/netfilter/ip6table_filter.c
-@@ -13,6 +13,7 @@
- #include <linux/moduleparam.h>
- #include <linux/netfilter_ipv6/ip6_tables.h>
- #include <linux/slab.h>
-+#include <net/netfilter/nf_conntrack.h>
- 
- MODULE_LICENSE("GPL");
- MODULE_AUTHOR("Netfilter Core Team <coreteam@netfilter.org>");
-@@ -37,6 +38,12 @@ ip6table_filter_hook(const struct nf_hoo
- 		     int (*okfn)(struct sk_buff *))
- {
- 	const struct net *net = dev_net((in != NULL) ? in : out);
-+	enum ip_conntrack_info ctinfo;
-+
-+	nf_ct_get(skb, &ctinfo);
-+	if ((ctinfo == IP_CT_ESTABLISHED_REPLY || ctinfo == IP_CT_ESTABLISHED) &&
-+	    net->ct.skip_filter)
-+	    return NF_ACCEPT;
- 
- 	return ip6t_do_table(skb, ops->hooknum, in, out,
- 			     net->ipv6.ip6table_filter);
---- a/net/netfilter/nf_conntrack_standalone.c
-+++ b/net/netfilter/nf_conntrack_standalone.c
-@@ -507,6 +507,13 @@ static struct ctl_table nf_ct_sysctl_tab
- 		.extra2		= &log_invalid_proto_max,
- 	},
- 	{
-+		.procname	= "nf_conntrack_skip_filter",
-+		.data		= &init_net.ct.skip_filter,
-+		.maxlen		= sizeof(int),
-+		.mode		= 0644,
-+		.proc_handler	= proc_dointvec,
-+	},
-+	{
- 		.procname	= "nf_conntrack_expect_max",
- 		.data		= &nf_ct_expect_max,
- 		.maxlen		= sizeof(int),
-@@ -542,6 +549,7 @@ static int nf_conntrack_standalone_init_
- 	table[2].data = &net->ct.htable_size;
- 	table[3].data = &net->ct.sysctl_checksum;
- 	table[4].data = &net->ct.sysctl_log_invalid;
-+	table[5].data = &net->ct.skip_filter;
- 
- 	/* Don't export sysctls to unprivileged users */
- 	if (net->user_ns != &init_user_ns)

target/linux/generic/patches-4.0/617-netfilter_skip_filter_sysctl.patch

@@ -1,87 +0,0 @@
---- a/include/net/netns/conntrack.h
-+++ b/include/net/netns/conntrack.h
-@@ -86,6 +86,7 @@ struct netns_ct {
- 	struct ctl_table_header	*helper_sysctl_header;
- #endif
- 	char			*slabname;
-+	int			skip_filter;
- 	unsigned int		sysctl_log_invalid; /* Log invalid packets */
- 	int			sysctl_events;
- 	int			sysctl_acct;
---- a/net/ipv4/netfilter/iptable_filter.c
-+++ b/net/ipv4/netfilter/iptable_filter.c
-@@ -15,6 +15,7 @@
- #include <linux/netfilter_ipv4/ip_tables.h>
- #include <linux/slab.h>
- #include <net/ip.h>
-+#include <net/netfilter/nf_conntrack.h>
- 
- MODULE_LICENSE("GPL");
- MODULE_AUTHOR("Netfilter Core Team <coreteam@netfilter.org>");
-@@ -37,6 +38,7 @@ iptable_filter_hook(const struct nf_hook
- 		    const struct net_device *in, const struct net_device *out,
- 		    int (*okfn)(struct sk_buff *))
- {
-+	enum ip_conntrack_info ctinfo;
- 	const struct net *net;
- 
- 	if (ops->hooknum == NF_INET_LOCAL_OUT &&
-@@ -46,6 +48,11 @@ iptable_filter_hook(const struct nf_hook
- 		return NF_ACCEPT;
- 
- 	net = dev_net((in != NULL) ? in : out);
-+	nf_ct_get(skb, &ctinfo);
-+	if ((ctinfo == IP_CT_ESTABLISHED_REPLY || ctinfo == IP_CT_ESTABLISHED) &&
-+	    net->ct.skip_filter)
-+	    return NF_ACCEPT;
-+
- 	return ipt_do_table(skb, ops->hooknum, in, out,
- 			    net->ipv4.iptable_filter);
- }
---- a/net/ipv6/netfilter/ip6table_filter.c
-+++ b/net/ipv6/netfilter/ip6table_filter.c
-@@ -13,6 +13,7 @@
- #include <linux/moduleparam.h>
- #include <linux/netfilter_ipv6/ip6_tables.h>
- #include <linux/slab.h>
-+#include <net/netfilter/nf_conntrack.h>
- 
- MODULE_LICENSE("GPL");
- MODULE_AUTHOR("Netfilter Core Team <coreteam@netfilter.org>");
-@@ -37,6 +38,12 @@ ip6table_filter_hook(const struct nf_hoo
- 		     int (*okfn)(struct sk_buff *))
- {
- 	const struct net *net = dev_net((in != NULL) ? in : out);
-+	enum ip_conntrack_info ctinfo;
-+
-+	nf_ct_get(skb, &ctinfo);
-+	if ((ctinfo == IP_CT_ESTABLISHED_REPLY || ctinfo == IP_CT_ESTABLISHED) &&
-+	    net->ct.skip_filter)
-+	    return NF_ACCEPT;
- 
- 	return ip6t_do_table(skb, ops->hooknum, in, out,
- 			     net->ipv6.ip6table_filter);
---- a/net/netfilter/nf_conntrack_standalone.c
-+++ b/net/netfilter/nf_conntrack_standalone.c
-@@ -507,6 +507,13 @@ static struct ctl_table nf_ct_sysctl_tab
- 		.extra2		= &log_invalid_proto_max,
- 	},
- 	{
-+		.procname	= "nf_conntrack_skip_filter",
-+		.data		= &init_net.ct.skip_filter,
-+		.maxlen		= sizeof(int),
-+		.mode		= 0644,
-+		.proc_handler	= proc_dointvec,
-+	},
-+	{
- 		.procname	= "nf_conntrack_expect_max",
- 		.data		= &nf_ct_expect_max,
- 		.maxlen		= sizeof(int),
-@@ -542,6 +549,7 @@ static int nf_conntrack_standalone_init_
- 	table[2].data = &net->ct.htable_size;
- 	table[3].data = &net->ct.sysctl_checksum;
- 	table[4].data = &net->ct.sysctl_log_invalid;
-+	table[5].data = &net->ct.skip_filter;
- 
- 	/* Don't export sysctls to unprivileged users */
- 	if (net->user_ns != &init_user_ns)