[pve-devel] pve-firewall: default loglevel behaviour change

[Alexandre DERUMIER]

Hi,

since this commit


https://git.proxmox.com/?p=pve-firewall.git;a=blobdiff;f=src/PVE/Firewall.pm;h=ccc5d7ffb62f1ef4c4d59e363192f512c88742c9;hp=6ac303831a62f630d437ef0e0508decd2b72f5ac;hb=3489f8a2b9597201fe8e42fa5832507f96169619;hpb=33efd363ab32d3f8f6a9c49e481cb62a8da40b5d

@@ -2341,10 +2348,10 @@ sub generate_tap_rules_direction {
     # plug the tap chain to bridge chain
     if ($direction eq 'IN') {
        ruleset_addrule($ruleset, "PVEFW-FWBR-IN",
-                       "-m physdev --physdev-is-bridged --physdev-out $iface", "-j $tapchain");
+                       "-m physdev --physdev-is-bridged --physdev-out $iface", "-j $tapchain", $loglevel, 'FWBR-IN: ', $vmid);
     } else {
        ruleset_addrule($ruleset, "PVEFW-FWBR-OUT",
-                       "-m physdev --physdev-is-bridged --physdev-in $iface", "-j $tapchain");
+                       "-m physdev --physdev-is-bridged --physdev-in $iface", "-j $tapchain", $loglevel, 'FWBR-OUT: ', $vmid);
     }
 }



The default loglevel of a vm is logging all packets comming to the tap chain
ex:
-A PVEFW-FWBR-IN -m physdev --physdev-out tap135i0 --physdev-is-bridged -m limit --limit 1/sec -j NFLOG --nflog-prefix  ":135:6:PVEFW-FWBR-IN: FWBR-IN: "

Previously, it was only for the final DROP/REJECT/ACCEPT action


Here a example with a connection to port 53, with default action input/output policy = reject, loglevelin:info, and no rule to allow port
[OPTIONS]

log_level_out: info
macfilter: 1
policy_out: REJECT
enable: 1
policy_in: REJECT
dhcp: 0
log_level_in: info

[RULES]





135 6 PVEFW-FWBR-IN 15/May/2019:15:53:23 +0200 FWBR-IN: IN=fwbr135i0 OUT=fwbr135i0 PHYSIN=fwln135i0 PHYSOUT=tap135i0 MAC=56:af:a2:0d:53:9b:58:49:3b:80:fb:24:08:00 SRC=10.11.53.33 DST=10.3.95.29 LEN=283 TOS=0x00 PREC=0x00 TTL=127 ID=20498 PROTO=UDP SPT=54689 DPT=389 LEN=263
135 6 tap135i0-IN 15/May/2019:15:53:23 +0200 policy REJECT: IN=fwbr135i0 OUT=fwbr135i0 PHYSIN=fwln135i0 PHYSOUT=tap135i0 MAC=56:af:a2:0d:53:9b:58:49:3b:80:fb:24:08:00 SRC=10.11.53.33 DST=10.3.95.29 LEN=283 TOS=0x00 PREC=0x00 TTL=127 ID=20498 PROTO=UDP SPT=54689 DPT=389 LEN=263


As you see, it's logged twice. (once when coming to tap chain, one when final action is reject)

Same if you make a rule in the vm, activating log on the rule, it's loggued twice.

I would like to be able to remove this logging in FWBR-IN, and only log on rules or default input/output policy action.
But currently, if I disable the loglevel=nolog, it's disabling too the log for default action.


I'm not sure, but do we really need this log on FWBR-IN ? (I mean, we don't have any info if it's drop/accept/reject, so it's pretty useless, we only now that a packet is coming).
Or maybe could we have a different loglevel option for default input/output policy ?