taglinefilesource code
rt_mss36include/linux/route.hunsigned long  rt_mss;    /* per route MTU/Window   */
rt_mss39include/net/route.hunsigned short    rt_mss;
rt_mss299net/ipv4/route.crt->rt_mss = dev->mtu - HEADER_SIZE;
rt_mss306net/ipv4/route.crt->rt_mss = mtu;
rt_mss514net/ipv4/route.cip_rt_add(flags, daddr, mask, gw, dev, r->rt_mss, r->rt_window, r->rt_irtt, metric);
rt_mss577net/ipv4/route.c(unsigned long)r->rt_mask, (int)r->rt_mss, r->rt_window, (int)r->rt_irtt);
rt_mss3025net/ipv4/tcp.cnewsk->mtu = rt->rt_mss - sizeof(struct iphdr) - sizeof(struct tcphdr);
rt_mss4552net/ipv4/tcp.csk->mtu = rt->rt_mss;