networkd: bridge add support to configure VLAN filtering (systemd#3344)

This patch implements support for IFLA_BR_VLAN_FILTERING configuration.

Author: toanju

man/systemd.netdev.xml

@@ -330,6 +330,15 @@
             </para>
           </listitem>
         </varlistentry>
+        <varlistentry>
+          <term><varname>VLANFiltering=</varname></term>
+          <listitem>
+            <para>A boolean. This setting controls the IFLA_BR_VLAN_FILTERING option in the kernel.
+            If enabled, the bridge will be started in VLAN-filtering mode. When unset, the kernel's
+            default setting applies.
+            </para>
+          </listitem>
+        </varlistentry>
       </variablelist>
 
   </refsect1>

src/network/networkd-netdev-bridge.c

@@ -102,6 +102,12 @@ static int netdev_bridge_post_create(NetDev *netdev, Link *link, sd_netlink_mess
                         return log_netdev_error_errno(netdev, r, "Could not append IFLA_BR_MCAST_SNOOPING attribute: %m");
         }
 
+        if (b->vlan_filtering >= 0) {
+                r = sd_netlink_message_append_u8(req, IFLA_BR_VLAN_FILTERING, b->vlan_filtering);
+                if (r < 0)
+                        return log_netdev_error_errno(netdev, r, "Could not append IFLA_BR_VLAN_FILTERING attribute: %m");
+        }
+
         r = sd_netlink_message_close_container(req);
         if (r < 0)
                 return log_netdev_error_errno(netdev, r, "Could not append IFLA_LINKINFO attribute: %m");
@@ -128,6 +134,7 @@ static void bridge_init(NetDev *n) {
 
         b->mcast_querier = -1;
         b->mcast_snooping = -1;
+        b->vlan_filtering = -1;
 }
 
 const NetDevVTable bridge_vtable = {

src/network/networkd-netdev-bridge.h

@@ -26,6 +26,7 @@ typedef struct Bridge {
 
         int mcast_querier;
         int mcast_snooping;
+        int vlan_filtering;
 
         usec_t forward_delay;
         usec_t hello_time;

src/network/networkd-netdev-gperf.gperf

@@ -100,3 +100,4 @@ Bridge.MaxAgeSec,            config_parse_sec,                   0,
 Bridge.ForwardDelaySec,      config_parse_sec,                   0,                             offsetof(Bridge, forward_delay)
 Bridge.MulticastQuerier,     config_parse_tristate,              0,                             offsetof(Bridge, mcast_querier)
 Bridge.MulticastSnooping,    config_parse_tristate,              0,                             offsetof(Bridge, mcast_snooping)
+Bridge.VLANFiltering,        config_parse_tristate,              0,                             offsetof(Bridge, vlan_filtering)