+ /* Obtain in_port from ctx->flow.in_port.
+ *
+ * lookup_input_bundle() also ensures that in_port belongs to a bundle. */
+ in_port = lookup_input_bundle(ctx->ofproto, ctx->flow.in_port,
+ ctx->packet != NULL);
+ if (!in_port) {
+ return;
+ }
+ in_bundle = in_port->bundle;
+
+ /* Drop malformed frames. */
+ if (ctx->flow.dl_type == htons(ETH_TYPE_VLAN) &&
+ !(ctx->flow.vlan_tci & htons(VLAN_CFI))) {
+ if (ctx->packet != NULL) {
+ static struct vlog_rate_limit rl = VLOG_RATE_LIMIT_INIT(1, 5);
+ VLOG_WARN_RL(&rl, "bridge %s: dropping packet with partial "
+ "VLAN tag received on port %s",
+ ctx->ofproto->up.name, in_bundle->name);
+ }
+ return;
+ }
+
+ /* Drop frames on bundles reserved for mirroring. */
+ if (in_bundle->mirror_out) {
+ if (ctx->packet != NULL) {
+ static struct vlog_rate_limit rl = VLOG_RATE_LIMIT_INIT(1, 5);
+ VLOG_WARN_RL(&rl, "bridge %s: dropping packet received on port "
+ "%s, which is reserved exclusively for mirroring",
+ ctx->ofproto->up.name, in_bundle->name);
+ }
+ return;
+ }
+
+ /* Check VLAN. */
+ vid = vlan_tci_to_vid(ctx->flow.vlan_tci);
+ if (!input_vid_is_valid(vid, in_bundle, ctx->packet != NULL)) {
+ return;
+ }
+ vlan = input_vid_to_vlan(in_bundle, vid);
+
+ /* Check other admissibility requirements. */
+ if (!is_admissible(ctx->ofproto, &ctx->flow, in_port, vlan, &ctx->tags)) {
+ output_mirrors(ctx, vlan, in_bundle, 0);
+ return;