taglinefilesource code
user_mss610net/inet/af_inet.csk->user_mss = 0;
user_mss110net/inet/sock.hvolatile unsigned short  user_mss;  /* mss requested by user in ioctl */
user_mss2115net/inet/tcp.cif (sk->user_mss)
user_mss2116net/inet/tcp.cnewsk->mtu = sk->user_mss;
user_mss3619net/inet/tcp.cif (sk->user_mss)
user_mss3620net/inet/tcp.csk->mtu = sk->user_mss;
user_mss4384net/inet/tcp.csk->user_mss=val;
user_mss4404net/inet/tcp.cval=sk->user_mss;