bpf: Add mtu checking to FIB forwarding helper
Add check that egress MTU can handle packet to be forwarded. If the MTU is less than the packet length, return 0 meaning the packet is expected to continue up the stack for help - eg., fragmenting the packet or sending an ICMP. The XDP path needs to leverage the FIB entry for an MTU on the route spec or an exception entry for a given destination. The skb path lets is_skb_forwardable decide if the packet can be sent. Signed-off-by: NDavid Ahern <dsahern@gmail.com> Signed-off-by: NDaniel Borkmann <daniel@iogearbox.net>
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