IP4_ADDR_DST
const char *ip_addr = family == AF_INET ? IP4_ADDR_DST : IP6_ADDR_DST;
SYS(fail, "ip netns exec %s ping -c 1 -W1 -I veth1 %s > /dev/null", ns1, IP4_ADDR_DST);
ret = SYS_NOFAIL("ip netns exec %s ping -c 1 -W1 -I veth1 %s", ns1, IP4_ADDR_DST);
SYS(out, "ip -n %s route del %s/32 dev veth3 %s", ns2, IP4_ADDR_DST, vrf);
ns1, IP4_ADDR_DST, BPF_FILE, sec, vrf);
ns2, IP4_ADDR_DST, BPF_FILE, sec, vrf);