Currently we accept any pmtu between IPV6_MMTU(1280B) and the link mtu.
In some network topologies could allow a bad actor to perform a DOS attack.
Contrary to IPv4 in IPv6 oversized packets are dropped, and a ICMP PACKET_TOO_BIG message is sent back to the sender.
After receiving an ICMPv6 packet with pmtu bigger than the current one the victim will start sending frames that will be dropped a router with reduced MTU.
Although it will eventually receive another message with correct pmtu, an attacker can still just inject their spoofed packets frequently enough to overwrite the correct value.
his issue is described in detail in RFC8201, section 6.
Fix this by checking the current pmtu, and accepting the new one only if it's smaller.
Discussed with: emaste, markj