Archie Cobbs
1c38f2ea70
The functions m_copym() and m_copypacket() return read-only copies, ...
because in the case of mbuf clusters they only increment the reference
count rather than actually copying the data.
Add comments to this effect, and add a new routine called m_dup() that
returns a real, writable copy of an mbuf chain.
This is preliminary work required for implementing 'ipfw tee'.
Reviewed by: julian
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1c38f2ea70