--- zzzz-none-000/linux-4.4.60/net/netfilter/nf_conntrack_proto_tcp.c	2017-04-08 07:53:53.000000000 +0000
+++ scorpion-7490-727/linux-4.4.60/net/netfilter/nf_conntrack_proto_tcp.c	2021-02-04 17:41:59.000000000 +0000
@@ -33,10 +33,15 @@
 #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  */
+int nf_ct_tcp_no_window_check __read_mostly = 1;
+EXPORT_SYMBOL_GPL(nf_ct_tcp_no_window_check);
+
 /* "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. */
-static int nf_ct_tcp_be_liberal __read_mostly = 0;
+int nf_ct_tcp_be_liberal __read_mostly;
+EXPORT_SYMBOL_GPL(nf_ct_tcp_be_liberal);
 
 /* If it is set to zero, we disable picking up already established
    connections. */
@@ -453,7 +458,7 @@
 
 	/* Fast path for timestamp-only option */
 	if (length == TCPOLEN_TSTAMP_ALIGNED
-	    && *(__be32 *)ptr == htonl((TCPOPT_NOP << 24)
+	    && net_hdr_word(ptr) == htonl((TCPOPT_NOP << 24)
 				       | (TCPOPT_NOP << 16)
 				       | (TCPOPT_TIMESTAMP << 8)
 				       | TCPOLEN_TIMESTAMP))
@@ -515,6 +520,9 @@
 	s32 receiver_offset;
 	bool res, in_recv_win;
 
+	if (nf_ct_tcp_no_window_check)
+		return true;
+
 	/*
 	 * Get the required data from the packet.
 	 */
@@ -1481,6 +1489,13 @@
 		.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,
+	},
 	{ }
 };