kern/79546: dummynet & ipfw tee: kernel may hang (endless loop)

[Gleb Smirnoff]

  Collegues,

  Can you please look at this PR? I see the suggested fix acceptable for now and
for ABI frozen RELENG_5 branch.

  Speaking of HEAD and future RELENG_6, I'd prefer to move the code that searches
for PACKET_TAG_DIVERT up to ip_fw_pfil.c, like we do it for dummynet and ng_ipfw
returned packets.

  What do you think?

  http://www.freebsd.org/cgi/query-pr.cgi?pr=kern/79546

-- 
Totus tuus, Glebius.
GLEBIUS-RIPN GLEB-RIPE