Robert Watson 08af97b790 Attempt to improve feature parity between UDPv4 and UDPv6 by merging
UDPv4 features to UDPv6:

- Add MAC checks on delivery and MAC labeling on transmit.
- Check for (and reject) datagrams with destination port 0.
- For multicast delivery, check the source port only if the socket being
  considered as a destination has been connected.
- Implement UDP blackholing based on net.inet.udp.blackhole.
- Add a new ICMPv6 unreachable reply rate limiting category for failed
  delivery attempts and implement rate limiting for UDPv6 (submitted by
  bz).

Approved by:	re (kensmith)
Reviewed by:	bz
2007-07-19 22:34:25 +00:00
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