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f-28: fix: add proper dhcp handle

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Signed-off-by: GnomeZworc <nicolas.boufidjeline@g3e.fr>
This commit is contained in:
GnomeZworc 2026-05-18 22:14:21 +02:00
commit 32b78a84f9
Signed by: nicolas.boufideline
GPG key ID: 4406BBBF8845D632
3 changed files with 46 additions and 35 deletions
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22
internal/ebtables/ebtables.go
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@ -13,46 +13,48 @@ func deleteRule(args ...string) error {
return exec.Command("ebtables", append([]string{"-D"}, args...)...).Run()
}
func DropARPToGateway(bridge, gatewayIP string) error {
func DropARPToGateway(iface, ip string) error {
if err := addRule("FORWARD",
"--out-interface", bridge,
"--out-interface", iface,
"-p", "arp",
"--arp-op", "Request",
"--arp-ip-dst", gatewayIP,
"--arp-ip-dst", ip,
"-j", "DROP"); err != nil {
return fmt.Errorf("ebtables arp rule: %w", err)
}
return nil
}
func DropDHCP(bridge string) error {
func DropDHCP(iface, ip string) error {
if err := addRule("FORWARD",
"--out-interface", bridge,
"--out-interface", iface,
"-p", "IPv4",
"--ip-protocol", "udp",
"--ip-source-port", "67:68",
"--ip-destination-port", "67:68",
"--ip-source", ip,
"-j", "DROP"); err != nil {
return fmt.Errorf("ebtables dhcp rule: %w", err)
}
return nil
}
func DeleteARPToGateway(bridge, gatewayIP string) error {
func DeleteARPToGateway(iface, ip string) error {
return deleteRule("FORWARD",
"--out-interface", bridge,
"--out-interface", iface,
"-p", "arp",
"--arp-op", "Request",
"--arp-ip-dst", gatewayIP,
"--arp-ip-dst", ip,
"-j", "DROP")
}
func DeleteDHCP(bridge string) error {
func DeleteDHCP(iface, ip string) error {
return deleteRule("FORWARD",
"--out-interface", bridge,
"--out-interface", iface,
"-p", "IPv4",
"--ip-protocol", "udp",
"--ip-source-port", "67:68",
"--ip-destination-port", "67:68",
"--ip-source", ip,
"-j", "DROP")
}