[newlib-cygwin] Follow the RFC6980 and silently ignore following IPv6 NDP messages

[newlib-cygwin] Follow the RFC6980 and silently ignore following IPv6 NDP messages

[Sebastian Huber]

https://sourceware.org/git/gitweb.cgi?p=newlib-cygwin.git;h=b43341334e42b30994380f74ec7c7bda4407a666

commit b43341334e42b30994380f74ec7c7bda4407a666
Author: ae@FreeBSD.org <ae@FreeBSD.org>
Date:   Fri Dec 15 12:37:32 2017 +0000

    Follow the RFC6980 and silently ignore following IPv6 NDP messages
    
    that had the IPv6 fragmentation header:
    o Neighbor Solicitation
    o Neighbor Advertisement
    o Router Solicitation
    o Router Advertisement
    o Redirect
    
    Introduce M_FRAGMENTED mbuf flag, and set it after IPv6 fragment reassembly
    is completed. Then check the presence of this flag in correspondig ND6
    handling routines.
    
    PR:		224247
    MFC after:	2 weeks

Diff:
---
 newlib/libc/sys/rtems/include/netinet6/in6.h | 1 +
 1 file changed, 1 insertion(+)

diff --git a/newlib/libc/sys/rtems/include/netinet6/in6.h b/newlib/libc/sys/rtems/include/netinet6/in6.h
index 99ac803..37e1e93 100644
--- a/newlib/libc/sys/rtems/include/netinet6/in6.h
+++ b/newlib/libc/sys/rtems/include/netinet6/in6.h
@@ -658,6 +658,7 @@ struct ip6_mtuinfo {
 #define	M_LOOP			M_PROTO6
 #define	M_AUTHIPDGM		M_PROTO7
 #define	M_RTALERT_MLD		M_PROTO8
+#define	M_FRAGMENTED		M_PROTO9	/* contained fragment header */
 
 #ifdef _KERNEL
 struct cmsghdr;