kp 86dedea3cb Preserve IPv6 fragment IDs accross reassembly and refragmentation
When forwarding fragmented IPv6 packets and filtering with PF we
reassemble and refragment. That means we generate new fragment headers
and a new fragment ID.

We already save the fragment IDs so we can do the reassembly so it's
straightforward to apply the incoming fragment ID on the refragmented
packets.

Differential Revision:	https://reviews.freebsd.org/D2188
Approved by:		gnn (mentor)
2015-04-01 12:15:01 +00:00
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