Add initial support for pf state synchronization over the network.

Implemented as an in-kernel multicast IP protocol.

Turn it on like this:

# ifconfig pfsync0 up syncif fxp0

There is not yet any authentication on this protocol, so the syncif
must be on a trusted network. ie, a crossover cable between the two
firewalls.

NOTABLE CHANGES:
- A new index based on a unique (creatorid, stateid) tuple has been
  added to the state tree.
- Updates now appear on the pfsync(4) interface; multiple updates may
  be compressed into a single update.
- Applications which use bpf on pfsync(4) will need modification;
  packets on pfsync no longer contains regular pf_state structs,
  but pfsync_state structs which contain no pointers.

Much more to come.

ok deraadt@

0 files changed, 0 insertions, 0 deletions