broadcast recognition is different now; use MGET macro; small simplifications

turn on checksum checking; don't calculate checksum on output
if not checking on input

in_control gets PRU_CONTROLS; bigger TCP send/recv buffers,
bigger UDP recv buffers

add SO_BROADCAST

allow broadcasts based on SO_BROADCAST; this permits unpriviledged
users to send broadcast messages so long as they specify ahead of time their
intent

Include file changes. No more ../h

add sostat

block input while doing temporary connect;
don't free mbuf on rcvoob (done later); allow broadcasts without routing

cache routes on send

shorten mbuf on end if longer than udp length (not beginning);
don't check checksums on input if checksum is 0;
on output, checksum of 0 becomes -1

must byte swap ip overlay header's length field before checksum;

4.2 distribution

getpeer

socketpair

revamp network ioctls

merge wnj changes plus lint

fix ip packet forwarding to not stomp on headers when fragmented;

random stuff

fix dropping mbufs

remove /usr/include dependencies

nor more opt parameter to usrreq

clean some stuff up and purge some crud

typed mbufs

misc 4.1c fixes

lint