ipv4_mtu 138 net/ipv4/route.c static unsigned int ipv4_mtu(const struct dst_entry *dst); ipv4_mtu 163 net/ipv4/route.c .mtu = ipv4_mtu, ipv4_mtu 1015 net/ipv4/route.c u32 old_mtu = ipv4_mtu(dst); ipv4_mtu 1296 net/ipv4/route.c unsigned int advmss = max_t(unsigned int, ipv4_mtu(dst) - header_size,