inp_flowinfo
(inp->inp_flowinfo & IPV6_FLOWLABEL_MASK);
inp->inp_flowinfo &= ~IPV6_FLOWLABEL_MASK;
inp->inp_flowinfo |=
flowinfo == (inp->inp_flowinfo & IPV6_FLOWLABEL_MASK) &&
inp->inp_flowinfo &= ~IPV6_FLOWLABEL_MASK;
inp->inp_flowinfo |=
ip6->ip6_flow = inp->inp_flowinfo & IPV6_FLOWINFO_MASK;
ip6->ip6_flow = inp->inp_flowinfo & IPV6_FLOWINFO_MASK;