IPV6_FLOWINFO_MASK
ip6->ip6_flow &= ~IPV6_FLOWINFO_MASK;
ip6->ip6_flow = (ip6->ip6_flow & ~IPV6_FLOWINFO_MASK) |
(inp->inp_flow & IPV6_FLOWINFO_MASK);
ip6->ip6_flow &= ~IPV6_FLOWINFO_MASK;
flowinfo = (u_int32_t)ntohl(ip6->ip6_flow & IPV6_FLOWINFO_MASK);
ip6->ip6_flow = (ip6->ip6_flow & ~IPV6_FLOWINFO_MASK) |
(inp->inp_flow & IPV6_FLOWINFO_MASK);
ip6->ip6_flow = inp->inp_flow & IPV6_FLOWINFO_MASK;
#if !defined(IPV6_FLOWINFO_MASK)