v4.19.13 snapshot.
diff --git a/include/net/tcp_states.h b/include/net/tcp_states.h
new file mode 100644
index 0000000..2875e16
--- /dev/null
+++ b/include/net/tcp_states.h
@@ -0,0 +1,52 @@
+/*
+ * INET An implementation of the TCP/IP protocol suite for the LINUX
+ * operating system. INET is implemented using the BSD Socket
+ * interface as the means of communication with the user level.
+ *
+ * Definitions for the TCP protocol sk_state field.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version
+ * 2 of the License, or (at your option) any later version.
+ */
+#ifndef _LINUX_TCP_STATES_H
+#define _LINUX_TCP_STATES_H
+
+enum {
+ TCP_ESTABLISHED = 1,
+ TCP_SYN_SENT,
+ TCP_SYN_RECV,
+ TCP_FIN_WAIT1,
+ TCP_FIN_WAIT2,
+ TCP_TIME_WAIT,
+ TCP_CLOSE,
+ TCP_CLOSE_WAIT,
+ TCP_LAST_ACK,
+ TCP_LISTEN,
+ TCP_CLOSING, /* Now a valid state */
+ TCP_NEW_SYN_RECV,
+
+ TCP_MAX_STATES /* Leave at the end! */
+};
+
+#define TCP_STATE_MASK 0xF
+
+#define TCP_ACTION_FIN (1 << TCP_CLOSE)
+
+enum {
+ TCPF_ESTABLISHED = (1 << TCP_ESTABLISHED),
+ TCPF_SYN_SENT = (1 << TCP_SYN_SENT),
+ TCPF_SYN_RECV = (1 << TCP_SYN_RECV),
+ TCPF_FIN_WAIT1 = (1 << TCP_FIN_WAIT1),
+ TCPF_FIN_WAIT2 = (1 << TCP_FIN_WAIT2),
+ TCPF_TIME_WAIT = (1 << TCP_TIME_WAIT),
+ TCPF_CLOSE = (1 << TCP_CLOSE),
+ TCPF_CLOSE_WAIT = (1 << TCP_CLOSE_WAIT),
+ TCPF_LAST_ACK = (1 << TCP_LAST_ACK),
+ TCPF_LISTEN = (1 << TCP_LISTEN),
+ TCPF_CLOSING = (1 << TCP_CLOSING),
+ TCPF_NEW_SYN_RECV = (1 << TCP_NEW_SYN_RECV),
+};
+
+#endif /* _LINUX_TCP_STATES_H */