icmp6_data32
#define nd_rs_reserved nd_rs_hdr.icmp6_data32[0]
#define nd_ns_reserved nd_ns_hdr.icmp6_data32[0]
#define nd_na_flags_reserved nd_na_hdr.icmp6_data32[0]
#define nd_rd_reserved nd_rd_hdr.icmp6_data32[0]
#define rr_seqnum rr_hdr.icmp6_data32[0]
#define icmp6_pptr icmp6_data32[0] /* parameter prob */
#define icmp6_mtu icmp6_data32[0] /* packet too big */