taglinefilesource code
user_mss121include/net/sock.hvolatile unsigned short  user_mss;  /* mss requested by user in ioctl */
user_mss657net/ipv4/af_inet.csk->user_mss = 0;
user_mss2785net/ipv4/tcp.cif (sk->user_mss)
user_mss2786net/ipv4/tcp.cnewsk->mtu = sk->user_mss;
user_mss4320net/ipv4/tcp.cif (sk->user_mss)
user_mss4321net/ipv4/tcp.csk->mtu = sk->user_mss;
user_mss5096net/ipv4/tcp.csk->user_mss=val;
user_mss5116net/ipv4/tcp.cval=sk->user_mss;