[pve-devel] applied + follow up: [PATCH] fix #3677: follow up: actually handle bucket size and ignore initval

Thomas Lamprecht t.lamprecht at proxmox.com
Fri Oct 29 20:09:03 CEST 2021

Applied yours and looked at bit more into it and made below follow up to
actually set bucket size from our side, what's probably more important
is that the "anything including _and_ after bucketsize gets dropped"
your patch switched to is not done anymore, depending if and what would
get added in the future it could be an issue to just ignore it as "no
change pending".

Anyhow, it should now work out, albeit I found a discrepancy between
ipset man page and the ipset kernel code (man page says bucket size is 2
to 14 and default is 14 but kernel effectively has it from 2 to 12 and
default 12, I'll poke the netfilter people with a patch about that to
see what's rather fixed, docs or code – just noting this here to avoid
people getting confused or at least give them a reference to find).

Anyhow, thanks for your active approach to fix such stuff and sending a
patch, much appreciated.

The former is simply new and we can control it, so do so instead of
ignoring it, if it seems worth while we can also expose that as
option or do some fancier auto calculation, maybe depending on ipset

The u32 `initval` is a bit different, its not a config in the exact
traditional sense but would allow to recreate an bit to bit
indentical save/restore - but we do not really do that and we cannot
pre-calculate that our self (or at least I'd rather like to avoid
doing that from perl).. So, ignore it actively for now to avoid
false-postivie detection in pending changes.

Cc: Mark Yardley <mgit at fragmentedpackets.net>
Signed-off-by: Thomas Lamprecht <t.lamprecht at proxmox.com>
 src/PVE/Firewall.pm | 12 +++++++-----
 1 file changed, 7 insertions(+), 5 deletions(-)

diff --git a/src/PVE/Firewall.pm b/src/PVE/Firewall.pm
index 6b9b787..11f07d1 100644
--- a/src/PVE/Firewall.pm
+++ b/src/PVE/Firewall.pm
@@ -1947,11 +1947,9 @@ sub ipset_get_chains {
 	return if $line =~ m/^\s*$/;
 	if ($line =~ m/^(?:\S+)\s(PVEFW-\S+)\s(?:\S+).*/) {
 	    my $chain = $1;
+	    # ignore initval from ipset v7.7+, won't set that yet so it'd mess up change detection
+	    $line =~ s/\binitval 0x[0-9a-f]+//;
 	    $line =~ s/\s+$//; # delete trailing white space
-	    # ignore bucketsize onwards from output of ipset v7+
-	    if ($line =~ m/^(.*?)(?:\sbucketsize.*)/) {
-		$line = $1;
-	    }
 	    push @{$chains->{$chain}}, $line;
 	} else {
 	    # simply ignore the rest
@@ -3487,9 +3485,13 @@ sub generate_ipset_chains {
 		$hashsize = round_powerof2($hashsize);
+	    my $bucketsize = 12; # lower than the default of 14, faster but slightly more memory use
 	    my $family = $ipversion == "6" ? "inet6" : "inet";
-	    $ipset_ruleset->{$name} = ["create $name hash:net family $family hashsize $hashsize maxelem $hashsize"];
+	    $ipset_ruleset->{$name} = [
+		"create $name hash:net family $family hashsize $hashsize maxelem $hashsize bucketsize $bucketsize"
+	    ];
 	    foreach my $cidr (sort keys %$data) {
 		my $entry = $data->{$cidr};

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