Receiving Optional Information via Ancillary Data (2)

• cmsg_level cmsg_type cmsg_data[]

• ------------ ------------ ------------------

• IPPROTO_IPV6 IPV6_PKTINFO in6_pktinfo{}

• IPPROTO_IPV6 IPV6_HOPLIMIT int

• IPPROTO_IPV6 IPV6_NEXTHOP sockaddr_in6{}

• IPPROTO_IPV6 IPV6_HOPOPTS ip6_hbh{}

• IPPROTO_IPV6 IPV6_DSTOPTS ip6_dst{}

• IPPROTO_IPV6 IPV6_RTHDR ip6_rthdr{}

Notes: