diff --git a/net-queue.c b/net-queue.c
index 75457f0..f6b01e9 100644
--- a/net-queue.c
+++ b/net-queue.c
@@ -41,6 +41,7 @@
 struct NetPacket {
     QTAILQ_ENTRY(NetPacket) entry;
     VLANClientState *sender;
+    unsigned flags;
     int size;
     NetPacketSent *sent_cb;
     uint8_t data[0];
@@ -89,6 +90,7 @@ void qemu_del_net_queue(NetQueue *queue)
 
 static ssize_t qemu_net_queue_append(NetQueue *queue,
                                      VLANClientState *sender,
+                                     unsigned flags,
                                      const uint8_t *buf,
                                      size_t size,
                                      NetPacketSent *sent_cb)
@@ -97,6 +99,7 @@ static ssize_t qemu_net_queue_append(NetQueue *queue,
 
     packet = qemu_malloc(sizeof(NetPacket) + size);
     packet->sender = sender;
+    packet->flags = flags;
     packet->size = size;
     packet->sent_cb = sent_cb;
     memcpy(packet->data, buf, size);
@@ -108,6 +111,7 @@ static ssize_t qemu_net_queue_append(NetQueue *queue,
 
 static ssize_t qemu_net_queue_append_iov(NetQueue *queue,
                                          VLANClientState *sender,
+                                         unsigned flags,
                                          const struct iovec *iov,
                                          int iovcnt,
                                          NetPacketSent *sent_cb)
@@ -123,6 +127,7 @@ static ssize_t qemu_net_queue_append_iov(NetQueue *queue,
     packet = qemu_malloc(sizeof(NetPacket) + max_len);
     packet->sender = sender;
     packet->sent_cb = sent_cb;
+    packet->flags = flags;
     packet->size = 0;
 
     for (i = 0; i < iovcnt; i++) {
@@ -139,13 +144,14 @@ static ssize_t qemu_net_queue_append_iov(NetQueue *queue,
 
 static ssize_t qemu_net_queue_deliver(NetQueue *queue,
                                       VLANClientState *sender,
+                                      unsigned flags,
                                       const uint8_t *data,
                                       size_t size)
 {
     ssize_t ret = -1;
 
     queue->delivering = 1;
-    ret = queue->deliver(sender, data, size, queue->opaque);
+    ret = queue->deliver(sender, flags, data, size, queue->opaque);
     queue->delivering = 0;
 
     return ret;
@@ -153,13 +159,14 @@ static ssize_t qemu_net_queue_deliver(NetQueue *queue,
 
 static ssize_t qemu_net_queue_deliver_iov(NetQueue *queue,
                                           VLANClientState *sender,
+                                          unsigned flags,
                                           const struct iovec *iov,
                                           int iovcnt)
 {
     ssize_t ret = -1;
 
     queue->delivering = 1;
-    ret = queue->deliver_iov(sender, iov, iovcnt, queue->opaque);
+    ret = queue->deliver_iov(sender, flags, iov, iovcnt, queue->opaque);
     queue->delivering = 0;
 
     return ret;
@@ -167,6 +174,7 @@ static ssize_t qemu_net_queue_deliver_iov(NetQueue *queue,
 
 ssize_t qemu_net_queue_send(NetQueue *queue,
                             VLANClientState *sender,
+                            unsigned flags,
                             const uint8_t *data,
                             size_t size,
                             NetPacketSent *sent_cb)
@@ -174,12 +182,12 @@ ssize_t qemu_net_queue_send(NetQueue *queue,
     ssize_t ret;
 
     if (queue->delivering) {
-        return qemu_net_queue_append(queue, sender, data, size, NULL);
+        return qemu_net_queue_append(queue, sender, flags, data, size, NULL);
     }
 
-    ret = qemu_net_queue_deliver(queue, sender, data, size);
+    ret = qemu_net_queue_deliver(queue, sender, flags, data, size);
     if (ret == 0 && sent_cb != NULL) {
-        qemu_net_queue_append(queue, sender, data, size, sent_cb);
+        qemu_net_queue_append(queue, sender, flags, data, size, sent_cb);
         return 0;
     }
 
@@ -190,6 +198,7 @@ ssize_t qemu_net_queue_send(NetQueue *queue,
 
 ssize_t qemu_net_queue_send_iov(NetQueue *queue,
                                 VLANClientState *sender,
+                                unsigned flags,
                                 const struct iovec *iov,
                                 int iovcnt,
                                 NetPacketSent *sent_cb)
@@ -197,12 +206,12 @@ ssize_t qemu_net_queue_send_iov(NetQueue *queue,
     ssize_t ret;
 
     if (queue->delivering) {
-        return qemu_net_queue_append_iov(queue, sender, iov, iovcnt, NULL);
+        return qemu_net_queue_append_iov(queue, sender, flags, iov, iovcnt, NULL);
     }
 
-    ret = qemu_net_queue_deliver_iov(queue, sender, iov, iovcnt);
+    ret = qemu_net_queue_deliver_iov(queue, sender, flags, iov, iovcnt);
     if (ret == 0 && sent_cb != NULL) {
-        qemu_net_queue_append_iov(queue, sender, iov, iovcnt, sent_cb);
+        qemu_net_queue_append_iov(queue, sender, flags, iov, iovcnt, sent_cb);
         return 0;
     }
 
@@ -234,6 +243,7 @@ void qemu_net_queue_flush(NetQueue *queue)
 
         ret = qemu_net_queue_deliver(queue,
                                      packet->sender,
+                                     packet->flags,
                                      packet->data,
                                      packet->size);
         if (ret == 0 && packet->sent_cb != NULL) {
diff --git a/net-queue.h b/net-queue.h
index ea17df6..343760e 100644
--- a/net-queue.h
+++ b/net-queue.h
@@ -32,15 +32,19 @@ typedef struct NetQueue NetQueue;
 typedef void (NetPacketSent) (VLANClientState *sender, ssize_t ret);
 
 typedef ssize_t (NetPacketDeliver) (VLANClientState *sender,
+                                    unsigned flags,
                                     const uint8_t *buf,
                                     size_t size,
                                     void *opaque);
 
 typedef ssize_t (NetPacketDeliverIOV) (VLANClientState *sender,
+                                       unsigned flags,
                                        const struct iovec *iov,
                                        int iovcnt,
                                        void *opaque);
 
+#define QEMU_NET_PACKET_FLAG_NONE  0
+
 NetQueue *qemu_new_net_queue(NetPacketDeliver *deliver,
                              NetPacketDeliverIOV *deliver_iov,
                              void *opaque);
@@ -48,12 +52,14 @@ void qemu_del_net_queue(NetQueue *queue);
 
 ssize_t qemu_net_queue_send(NetQueue *queue,
                             VLANClientState *sender,
+                            unsigned flags,
                             const uint8_t *data,
                             size_t size,
                             NetPacketSent *sent_cb);
 
 ssize_t qemu_net_queue_send_iov(NetQueue *queue,
                                 VLANClientState *sender,
+                                unsigned flags,
                                 const struct iovec *iov,
                                 int iovcnt,
                                 NetPacketSent *sent_cb);
diff --git a/net.c b/net.c
index 56d979b..30dc402 100644
--- a/net.c
+++ b/net.c
@@ -302,10 +302,12 @@ static char *assign_name(VLANClientState *vc1, const char *model)
 }
 
 static ssize_t qemu_deliver_packet(VLANClientState *sender,
+                                   unsigned flags,
                                    const uint8_t *data,
                                    size_t size,
                                    void *opaque);
 static ssize_t qemu_deliver_packet_iov(VLANClientState *sender,
+                                       unsigned flags,
                                        const struct iovec *iov,
                                        int iovcnt,
                                        void *opaque);
@@ -450,6 +452,7 @@ int qemu_can_send_packet(VLANClientState *sender)
 }
 
 static ssize_t qemu_deliver_packet(VLANClientState *sender,
+                                   unsigned flags,
                                    const uint8_t *data,
                                    size_t size,
                                    void *opaque)
@@ -464,6 +467,7 @@ static ssize_t qemu_deliver_packet(VLANClientState *sender,
 }
 
 static ssize_t qemu_vlan_deliver_packet(VLANClientState *sender,
+                                        unsigned flags,
                                         const uint8_t *buf,
                                         size_t size,
                                         void *opaque)
@@ -543,7 +547,9 @@ ssize_t qemu_send_packet_async(VLANClientState *sender,
         queue = sender->vlan->send_queue;
     }
 
-    return qemu_net_queue_send(queue, sender, buf, size, sent_cb);
+    return qemu_net_queue_send(queue, sender,
+                               QEMU_NET_PACKET_FLAG_NONE,
+                               buf, size, sent_cb);
 }
 
 void qemu_send_packet(VLANClientState *vc, const uint8_t *buf, int size)
@@ -580,6 +586,7 @@ static ssize_t calc_iov_length(const struct iovec *iov, int iovcnt)
 }
 
 static ssize_t qemu_deliver_packet_iov(VLANClientState *sender,
+                                       unsigned flags,
                                        const struct iovec *iov,
                                        int iovcnt,
                                        void *opaque)
@@ -598,6 +605,7 @@ static ssize_t qemu_deliver_packet_iov(VLANClientState *sender,
 }
 
 static ssize_t qemu_vlan_deliver_packet_iov(VLANClientState *sender,
+                                            unsigned flags,
                                             const struct iovec *iov,
                                             int iovcnt,
                                             void *opaque)
@@ -646,7 +654,9 @@ ssize_t qemu_sendv_packet_async(VLANClientState *sender,
         queue = sender->vlan->send_queue;
     }
 
-    return qemu_net_queue_send_iov(queue, sender, iov, iovcnt, sent_cb);
+    return qemu_net_queue_send_iov(queue, sender,
+                                   QEMU_NET_PACKET_FLAG_NONE,
+                                   iov, iovcnt, sent_cb);
 }
 
 ssize_t
