kernel: add a patch to allow disabling processing of the netfilter "filter" table...

Signed-off-by: Felix Fietkau <nbd@openwrt.org>
Backport of r42046

SVN-Revision: 42050

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
new file mode 100644 (file)
index 0000000..a570834
--- /dev/null
+++ b/target/linux/generic/patches-3.10/617-netfilter_skip_filter_sysctl.patch
@@ -0,0 +1,87 @@
+--- 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
+@@ -477,6 +477,13 @@ 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),
+@@ -512,6 +519,7 @@ 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)