taglinefilesource code
RTF_DYNAMIC455net/ipv4/icmp.cip_rt_add((RTF_DYNAMIC | RTF_MODIFIED | RTF_GATEWAY),
RTF_DYNAMIC476net/ipv4/icmp.cip_rt_add((RTF_DYNAMIC | RTF_MODIFIED | RTF_HOST | RTF_GATEWAY),
RTF_DYNAMIC252net/ipv4/route.cif (flags & RTF_DYNAMIC)