Make pf more VNET safe
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Authored by bz on Jun 22 2016, 12:59 PM.

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emaste
nvass-gmx.com
kp
gnn

Commits

rS302156: Update pf(4) and pflog(4) to survive basic VNET testing, which includes

Summary

Update pf(4) and pflog(4) to survive basic VNET testing, which includes
proper virtualisation, teardown, avoiding use-after-free, race conditions,
no longer creating a thread per VNET (which could easily be a couple of
thousand threads), handling global events (e.g., eventhandlers) on teardown,
clearing various globally cached pointers and checking them before use.

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Repository

rS FreeBSD src repository - subversion

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Buildable 4297
Build 4341: arc lint + arc unit

Event Timeline

bz updated this revision to Diff 17762.Jun 22 2016, 12:59 PM

bz retitled this revision from to Make pf more VNET safe.

bz updated this object.

bz edited the test plan for this revision. (Show Details)

bz added reviewers: gnn, emaste, kp, nvass-gmx.com.

bz added a subscriber: network.

Herald added a subscriber: imp. · View Herald TranscriptJun 22 2016, 12:59 PM

I can't discuss the code, I can only test it and see if it makes the difference in system stability. Any chance for this to land in 11.0?

In D6924#145160, @robak wrote:

I can't discuss the code, I can only test it and see if it makes the difference in system stability. Any chance for this to land in 11.0?

Yes, that's the plan. Needs all the testing it can get and I am still looking at pfsync and a possible very old security issue (don't run with untrusted customers in VNET yet) which I don't know if FreeBSD is vulnerable to.

kp added inline comments.Jun 22 2016, 8:15 PM

sys/netpfil/pf/pf.c
302	There's a '#define V_pf_end_threads VNET(pf_end_threads)' in net/pfvar.h. Presumably you'll want to get rid of that too.
sys/netpfil/pf/pf_if.c
911	Minor typo here and in the others like it. 'expensie'.
sys/netpfil/pf/pf_ioctl.c
3782	When is this ever not true? As far as I can tell you removed the only pf_end_threads++; from pf_purge_thread()