firmware/src/packages/fff/fff-node/files/usr/lib/firewall.d/05-setup-batman-chains
Fabian Bläse 157fa4eac5 fff-firewall: Switch from ip/ebtables to nftables
Include nftables and appropriate modules. Translate ip- and ebtables
rules to their nftables counterparts. Remove ip/ebtables and modules.

This change intentionally tries to keep structural changes at a minimum
to keep the rule translation comprehensible.

kmod-nft-bridge is not required for fff-node, because it was merged into
a single kernel module since Linux 4.17:
[1] 02c7b25e5f
[2] fbaf48387e

Fixes: #252

Signed-off-by: Fabian Bläse <fabian@blaese.de>
Co-authored-by: Johannes Kimmel <fff@bareminimum.eu>
2023-12-26 18:51:35 +01:00

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nft -f - <<__EOF
table bridge filter {
# IN_ONLY wird angesprungen, wenn dieses Paket nur
# vom Gateway (also vom BATMAN) kommen darf.
chain IN_ONLY {
# -i ! bat0 --logical-in br-client -j DROP
iifname != "bat0" counter drop
counter
}
# OUT_ONLY wird angesprungen, wenn dieses Paket nur
# in Richtung Gateway (also ins BATMAN) gesendet werden darf.
chain OUT_ONLY {
# --logical-out br-client -o ! bat0 -j DROP
oifname != "bat0" counter drop
counter
}
# MULTICAST_OUT filtert/reduziert Multicast-Frames, die ins BATMAN gesendet werden.
chain MULTICAST_OUT {
}
chain INPUT {
type filter hook input priority filter; policy accept;
# -d Multicast -i ! bat0 --logical-in br-client -j ACCEPT
iifname != "bat0" ether daddr & 01:00:00:00:00:00 == 01:00:00:00:00:00 counter packets 0 bytes 0 accept
}
chain FORWARD {
type filter hook forward priority filter; policy accept;
# -d Multicast --logical-out br-client -o bat0 -j MULTICAST_OUT
oifname "bat0" ether daddr & 01:00:00:00:00:00 == 01:00:00:00:00:00 counter packets 0 bytes 0 jump MULTICAST_OUT
}
chain OUTPUT {
type filter hook output priority filter; policy accept;
# -d Multicast --logical-out br-client -o bat0 -j MULTICAST_OUT
oifname "bat0" ether daddr & 01:00:00:00:00:00 == 01:00:00:00:00:00 counter jump MULTICAST_OUT
}
}
__EOF