netfilter: hook packets before net queue send

Capture packets that will be sent.

Signed-off-by: Yang Hongyang <yanghy@cn.fujitsu.com>
Reviewed-by: Thomas Huth <thuth@redhat.com>
Signed-off-by: Jason Wang <jasowang@redhat.com>

1 files changed, 17 insertions, 0 deletions

diff --git a/net/filter.c b/net/filter.c
index d4062591d5..147c57f7a7 100644
--- a/net/filter.c
+++ b/net/filter.c
@@ -15,6 +15,23 @@
 #include "net/vhost_net.h"
 #include "qom/object_interfaces.h"
 
+ssize_t qemu_netfilter_receive(NetFilterState *nf,
+                               NetFilterDirection direction,
+                               NetClientState *sender,
+                               unsigned flags,
+                               const struct iovec *iov,
+                               int iovcnt,
+                               NetPacketSent *sent_cb)
+{
+    if (nf->direction == direction ||
+        nf->direction == NET_FILTER_DIRECTION_ALL) {
+        return NETFILTER_GET_CLASS(OBJECT(nf))->receive_iov(
+                                   nf, sender, flags, iov, iovcnt, sent_cb);
+    }
+
+    return 0;
+}
+
 static char *netfilter_get_netdev_id(Object *obj, Error **errp)
 {
     NetFilterState *nf = NETFILTER(obj);