add preliminary 3.14 support

[openwrt.git] / target / linux / generic / patches-3.14 / 613-netfilter_optional_tcp_window_check.patch

diff --git a/target/linux/generic/patches-3.14/613-netfilter_optional_tcp_window_check.patch b/target/linux/generic/patches-3.14/613-netfilter_optional_tcp_window_check.patch
new file mode 100644 (file)
index 0000000..1d3b37c
--- /dev/null
+++ b/target/linux/generic/patches-3.14/613-netfilter_optional_tcp_window_check.patch
@@ -0,0 +1,36 @@
+--- a/net/netfilter/nf_conntrack_proto_tcp.c
++++ b/net/netfilter/nf_conntrack_proto_tcp.c
+@@ -33,6 +33,9 @@
+ #include <net/netfilter/ipv4/nf_conntrack_ipv4.h>
+ #include <net/netfilter/ipv6/nf_conntrack_ipv6.h>
+ 
++/* Do not check the TCP window for incoming packets  */
++static int nf_ct_tcp_no_window_check __read_mostly = 1;
++
+ /* "Be conservative in what you do,
+     be liberal in what you accept from others."
+     If it's non-zero, we mark only out of window RST segments as INVALID. */
+@@ -515,6 +518,9 @@ static bool tcp_in_window(const struct n
+       s32 receiver_offset;
+       bool res, in_recv_win;
+ 
++      if (nf_ct_tcp_no_window_check)
++              return true;
++
+       /*
+        * Get the required data from the packet.
+        */
+@@ -1452,6 +1458,13 @@ static struct ctl_table tcp_sysctl_table
+               .mode           = 0644,
+               .proc_handler   = proc_dointvec,
+       },
++      {
++              .procname       = "nf_conntrack_tcp_no_window_check",
++              .data           = &nf_ct_tcp_no_window_check,
++              .maxlen         = sizeof(unsigned int),
++              .mode           = 0644,
++              .proc_handler   = proc_dointvec,
++      },
+       { }
+ };
+