Pull up following revision(s) (requested by msaitoh in ticket #424):
sys/net/if_loop.c: revision 1.108
sys/net/if_loop.c: revision 1.109
Fix IP broadcast + checksum offload problem.
When a machine sends a IP broadcast packet to an Ethernet interface that the
checksum offload flags are set, the packet goes through ether_output() ->
looutput() and the offload flags is cleared without calculating the checksum.
And then, ip_input() calculate the packet's checksum because it's csum_flags is
zero. It regard as bad checksum and it's dropped because the packet's ifp
is s not lo0's. Fixes this bug by passing csum_flags as "calculated and good"
when IN_LOOPBACK_NEED_CHECKSUM() is false. Advised by ryo@.
This problem was seen when "routed -s" was used and the machine's interface's
offload flags were set. bad checksum field of "netstat -s" was increased every
30 seconds.
Fix comment.
UnifiedSplitRaw
