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pfctl: Point users to net.pf.request_maxcount if large requests are rejected
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Authored by kristof on Jan 21 2019, 3:50 AM.

Details

Summary

The kernel will reject very large tables to avoid resource exhaustion
attacks. Some users run into this limit with legitimate table
configurations.

The error message in this case was not very clear:
pf.conf:1: cannot define table nets: Invalid argument
pfctl: Syntax error in config file: pf rules not loaded

If a table definition fails we now check the request_maxcount setting,
and if we've tried to create more than that point the user at
net.pf.request_maxcount:
pf.conf:1: cannot define table nets: too many elements.
Consider increasing net.pf.request_maxcount.
pfctl: Syntax error in config file: pf rules not loaded

PR: 235076

Diff Detail

Repository
rS FreeBSD src repository
Lint
Automatic diff as part of commit; lint not applicable.
Unit
Automatic diff as part of commit; unit tests not applicable.

Event Timeline

kristof created this revision.Jan 21 2019, 3:50 AM
kristof set the repository for this revision to rS FreeBSD src repository.
This revision was not accepted when it landed; it landed in state Needs Review.Jan 28 2019, 8:36 AM
This revision was automatically updated to reflect the committed changes.