tag	line	file	source code
RTF_DYNAMIC	509	net/ipv4/icmp.c	ip_rt_add((RTF_DYNAMIC | RTF_MODIFIED | RTF_GATEWAY),
RTF_DYNAMIC	541	net/ipv4/route.c	if (flags & RTF_DYNAMIC)
RTF_DYNAMIC	1127	net/ipv4/route.c	rt->rt_flags = RTF_DYNAMIC | RTF_MODIFIED | RTF_HOST | RTF_GATEWAY | RTF_UP;