ethernet: don't do DHCPv4 on PPPoE

It's not going to work.

Fixes: 58287cbcc0c8 ('core: rework IP configuration in NetworkManager using layer 3 configuration')

1 files changed, 27 insertions, 0 deletions

diff --git a/src/core/devices/nm-device-ethernet.c b/src/core/devices/nm-device-ethernet.c
index 842d863e8f..7cddf9d838 100644
--- a/src/core/devices/nm-device-ethernet.c
+++ b/src/core/devices/nm-device-ethernet.c
@@ -1892,6 +1892,32 @@ is_available(NMDevice *device, NMDeviceCheckDevAvailableFlags flags)
     return !!nm_device_get_initial_hw_address(device);
 }
 
+static const char *
+get_ip_method_auto(NMDevice *device, int addr_family)
+{
+    NMSettingConnection *s_con;
+
+    s_con = nm_device_get_applied_setting(device, NM_TYPE_SETTING_CONNECTION);
+    g_return_val_if_fail(s_con,
+                         NM_IS_IPv4(addr_family) ? NM_SETTING_IP4_CONFIG_METHOD_AUTO
+                                                 : NM_SETTING_IP6_CONFIG_METHOD_AUTO);
+
+    if (!nm_streq(nm_setting_connection_get_connection_type(s_con),
+                  NM_SETTING_PPPOE_SETTING_NAME)) {
+        return NM_DEVICE_CLASS(nm_device_ethernet_parent_class)
+            ->get_ip_method_auto(device, addr_family);
+    }
+
+    if (NM_IS_IPv4(addr_family)) {
+        /* We cannot do DHCPv4 on a PPP link, instead we get "auto" IP addresses
+         * by pppd. Return "manual" here, which has the suitable effect to a
+         * (zero) manual addresses in addition. */
+        return NM_SETTING_IP6_CONFIG_METHOD_MANUAL;
+    }
+
+    return NM_SETTING_IP6_CONFIG_METHOD_AUTO;
+}
+
 static gboolean
 can_reapply_change(NMDevice   *device,
                    const char *setting_name,
@@ -2047,6 +2073,7 @@ nm_device_ethernet_class_init(NMDeviceEthernetClass *klass)
     device_class->act_stage2_config                              = act_stage2_config;
     device_class->act_stage3_ip_config                           = act_stage3_ip_config;
     device_class->get_configured_mtu                             = get_configured_mtu;
+    device_class->get_ip_method_auto                             = get_ip_method_auto;
     device_class->deactivate                                     = deactivate;
     device_class->get_s390_subchannels                           = get_s390_subchannels;
     device_class->update_connection                              = update_connection;