INP_IPV4
dp->inp_vflag |= INP_IPV4;
#ifndef INP_IPV4
answer = inp->inp_vflag & INP_IPV4;
inp->inp_vflag |= INP_IPV4;
inp->inp_vflag |= INP_IPV4;
#ifndef INP_IPV4
inp->inp_vflag |= INP_IPV4;
intodccpcb(inp)->inp_vflag &= ~INP_IPV4;
dp->inp_vflag &= ~INP_IPV4;
inp->inp_vflag &= ~INP_IPV4;
inp->inp_vflag |= INP_IPV4;
inp->inp_vflag |= INP_IPV4;
inp->inp_vflag |= INP_IPV4;