1. Don't assert on IGMP inside ICMP, just ignore it. 2. Check we have full IP header inside ICMP payload before accessing it. 3. `inner_l4hdrbak` need to be `L4_MAXHDRLEN`, not `L4_MAXHDRLEN/2`. Signed-off-by: Zhe Weng <wengzhe@xiaomi.com>
xxx_ipv6multicast