[newlib-cygwin] tcp: add support for TCP over UDP

[newlib-cygwin] tcp: add support for TCP over UDP

[Sebastian Huber]

https://sourceware.org/git/gitweb.cgi?p=newlib-cygwin.git;h=85140fb3788b9880a6e62f5d7528c0da3243715d

commit 85140fb3788b9880a6e62f5d7528c0da3243715d
Author: Michael Tuexen <tuexen@FreeBSD.org>
Date:   Sun Apr 18 16:08:08 2021 +0200

    tcp: add support for TCP over UDP
    
    Adding support for TCP over UDP allows communication with
    TCP stacks which can be implemented in userspace without
    requiring special priviledges or specific support by the OS.
    This is joint work with rrs.
    
    Reviewed by:            rrs
    Sponsored by:           Netflix, Inc.
    MFC after:              1 week
    Differential Revision:  https://reviews.freebsd.org/D29469

Diff:
---
 newlib/libc/sys/rtems/include/netinet/tcp.h | 1 +
 1 file changed, 1 insertion(+)

diff --git a/newlib/libc/sys/rtems/include/netinet/tcp.h b/newlib/libc/sys/rtems/include/netinet/tcp.h
index 0b71bd465..d2bf1f843 100644
--- a/newlib/libc/sys/rtems/include/netinet/tcp.h
+++ b/newlib/libc/sys/rtems/include/netinet/tcp.h
@@ -183,6 +183,7 @@ struct tcphdr {
 #define	TCP_RXTLS_MODE	42	/* Receive TLS mode */
 #define	TCP_CONGESTION	64	/* get/set congestion control algorithm */
 #define	TCP_CCALGOOPT	65	/* get/set cc algorithm specific options */
+#define TCP_REMOTE_UDP_ENCAPS_PORT 71	/* Enable TCP over UDP tunneling via the specified port */
 #define TCP_DELACK  	72	/* socket option for delayed ack */
 #define TCP_FIN_IS_RST 73	/* A fin from the peer is treated has a RST */
 #define TCP_LOG_LIMIT  74	/* Limit to number of records in tcp-log */