diff --git a/package/base-files/files/etc/sysctl.conf b/package/base-files/files/etc/sysctl.conf
index 1225e46fd00fd06dc3e921eda1213f7c54123fb5..8f3de1aac0d917579cea30e9706292cb5d821707 100644
--- a/package/base-files/files/etc/sysctl.conf
+++ b/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
diff --git a/target/linux/generic/patches-3.10/617-netfilter_skip_filter_sysctl.patch b/target/linux/generic/patches-3.10/617-netfilter_skip_filter_sysctl.patch
deleted file mode 100644
index be0dd3dfe67f80a26a017e61bc8a2fca8f7b2f09..0000000000000000000000000000000000000000
--- a/target/linux/generic/patches-3.10/617-netfilter_skip_filter_sysctl.patch
+++ /dev/null
@@ -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)
diff --git a/target/linux/generic/patches-3.14/617-netfilter_skip_filter_sysctl.patch b/target/linux/generic/patches-3.14/617-netfilter_skip_filter_sysctl.patch
deleted file mode 100644
index 255eaae52e02c4eddb5f18efd3e67028d2a063bf..0000000000000000000000000000000000000000
--- a/target/linux/generic/patches-3.14/617-netfilter_skip_filter_sysctl.patch
+++ /dev/null
@@ -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)
diff --git a/target/linux/generic/patches-3.18/617-netfilter_skip_filter_sysctl.patch b/target/linux/generic/patches-3.18/617-netfilter_skip_filter_sysctl.patch
deleted file mode 100644
index 247d3539c263a71df068bfb6298285da39a697e6..0000000000000000000000000000000000000000
--- a/target/linux/generic/patches-3.18/617-netfilter_skip_filter_sysctl.patch
+++ /dev/null
@@ -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)
diff --git a/target/linux/generic/patches-3.19/617-netfilter_skip_filter_sysctl.patch b/target/linux/generic/patches-3.19/617-netfilter_skip_filter_sysctl.patch
deleted file mode 100644
index 6cf6568ab54ecf161e516101f3cc2a6c0fc22caa..0000000000000000000000000000000000000000
--- a/target/linux/generic/patches-3.19/617-netfilter_skip_filter_sysctl.patch
+++ /dev/null
@@ -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)
diff --git a/target/linux/generic/patches-4.0/617-netfilter_skip_filter_sysctl.patch b/target/linux/generic/patches-4.0/617-netfilter_skip_filter_sysctl.patch
deleted file mode 100644
index 6cf6568ab54ecf161e516101f3cc2a6c0fc22caa..0000000000000000000000000000000000000000
--- a/target/linux/generic/patches-4.0/617-netfilter_skip_filter_sysctl.patch
+++ /dev/null
@@ -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)