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

0 files changed, 0 insertions, 0 deletions