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gluon-ebtables-filter-ra-dhcp: disable DHCPv4 filter when gw_mode == 'server' (#2324)

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In meshes without VPN or supernodes, it may be desirable to connect a
router providing IPv4 addresses directly to a regular Gluon node. For
this to work, it was necessary to remove the gluon-ebtables-filter-ra-dhcp
package from the node, so the autoupdater also needed to be disabled.

To avoid this, make gluon-ebtables-filter-ra-dhcp disable the DHCPv4
filter rules when gw_mode is set to 'server'.

No solution is provided for RA/DHCPv6, but this seems less pressing for
local meshes, as nodes can already provide working IPv6 connectivity
by themselves through gluon-radvd.
This commit is contained in:
Matthias Schiffer 2021-12-16 20:01:57 +01:00 committed by GitHub
parent e153ba6bd7
commit 1013dcb148
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1 changed files with 10 additions and 4 deletions
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14
package/gluon-ebtables-filter-ra-dhcp/luasrc/lib/gluon/ebtables/200-dir-dhcpv4
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@ -1,5 +1,11 @@
rule 'FORWARD -p IPv4 --ip-protocol udp --ip-destination-port 67 -j OUT_ONLY'
rule 'OUTPUT -p IPv4 --ip-protocol udp --ip-destination-port 67 -j OUT_ONLY'
local uci = require('simple-uci').cursor()
rule 'FORWARD -p IPv4 --ip-protocol udp --ip-destination-port 68 -j IN_ONLY'
rule 'INPUT -p IPv4 --ip-protocol udp --ip-destination-port 68 -j IN_ONLY'
local gw_mode = uci:get('network', 'gluon_bat0', 'gw_mode')
if gw_mode ~= 'server' then
rule 'FORWARD -p IPv4 --ip-protocol udp --ip-destination-port 67 -j OUT_ONLY'
rule 'OUTPUT -p IPv4 --ip-protocol udp --ip-destination-port 67 -j OUT_ONLY'
rule 'FORWARD -p IPv4 --ip-protocol udp --ip-destination-port 68 -j IN_ONLY'
rule 'INPUT -p IPv4 --ip-protocol udp --ip-destination-port 68 -j IN_ONLY'
end