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Thomas Steen Rasmussen fae2a8cad3 pf: fallback if $pf_rules fails to load
Support loading a default pf ruleset in case of invalid pf.conf.

If no pf rules are loaded pf will pass/allow all traffic, assuming the
kernel is compiled without PF_DEFAULT_TO_DROP, as is the case in
GENERIC.

In other words: if there's a typo in the main pf_rules we would allow
all traffic. The new default rules minimise the impact of this.

If $pf_program (i.e. pfctl) fails to set $pf_fules and
$pf_fallback_rules_enable is YES we will load $pf_fallback_rules_file if
set, or $pf_fallback_rules.

$pf_fallback_rules can include multiple rules, for example to permit
traffic on a management interface.

$pf_fallback_rules_enable defaults to "NO", preserving historic behaviour.

man page changes by ceri@.

PR:		256410
Reviewed by:	donner, kp
Sponsored by:	semaphor.dk
Differential Revision:	https://reviews.freebsd.org/D30791

(cherry picked from commit 28f47a199c)
2022-01-24 21:11:02 +01:00
.cirrus-ci
.github/workflows
bin
cddl
contrib
crypto
etc
gnu
include
kerberos5
lib Revert "libthr: Use kern.stacktop for thread stack calculation." 2022-01-24 09:20:03 -05:00
libexec pf: fallback if $pf_rules fails to load 2022-01-24 21:11:02 +01:00
release
rescue
sbin
secure
share pf: fallback if $pf_rules fails to load 2022-01-24 21:11:02 +01:00
stand
sys Revert "kern_exec: Add kern.stacktop sysctl." 2022-01-24 09:20:21 -05:00
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usr.bin
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