Add a limit of the number of fragments per IPv6 packet.

The IPv4 fragment reassembly code supports a limit on the number of
fragments per packet. The default limit is currently 17 fragments.
Among other things, this limit serves to limit the number of fragments
the code must parse when trying to reassembly a packet.

Add a limit to the IPv6 reassembly code. By default, limit a packet
to 65 fragments (64 on the queue, plus one final fragment to complete
the packet). This allows an average fragment size of 1,008 bytes, which
should be sufficient to hold a fragment. (Recall that the IPv6 minimum
MTU is 1280 bytes. Therefore, this configuration allows a full-size
IPv6 packet to be fragmented on a link with the minimum MTU and still
carry approximately 272 bytes of headers before the fragmented portion
of the packet.)

Users can adjust this limit using the net.inet6.ip6.maxfragsperpacket
sysctl.

Reviewed by:	jhb
Security:	FreeBSD-SA-18:10.ip
Security:	CVE-2018-6923

newlib/libc/sys/rtems/include/netinet6/in6.h

@@ -642,7 +642,8 @@ struct ip6_mtuinfo {
 #define	IPV6CTL_INTRQMAXLEN	51	/* max length of IPv6 netisr queue */
 #define	IPV6CTL_INTRDQMAXLEN	52	/* max length of direct IPv6 netisr
 					 * queue */
-#define	IPV6CTL_MAXID		53
+#define	IPV6CTL_MAXFRAGSPERPACKET	53 /* Max fragments per packet */
+#define	IPV6CTL_MAXID		54
 #endif /* __BSD_VISIBLE */
 
 /*