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authorYang Hongyang <yanghy@cn.fujitsu.com>2015-10-07 11:52:18 +0800
committerJason Wang <jasowang@redhat.com>2015-10-12 13:30:45 +0800
commit7ef7bc8586fb0d41742a896b532c7afa2bbb7f84 (patch)
treedd0351b26fc452987545bee53b77374b2b18e67b /net
parent3e033a46a7e39ea31e15f1b53402df990977115a (diff)
netfilter: add an API to pass the packet to next filter
add an API qemu_netfilter_pass_to_next() to pass the packet to next filter. Signed-off-by: Yang Hongyang <yanghy@cn.fujitsu.com> Reviewed-by: Thomas Huth <thuth@redhat.com> Signed-off-by: Jason Wang <jasowang@redhat.com>
Diffstat (limited to 'net')
-rw-r--r--net/filter.c58
1 files changed, 58 insertions, 0 deletions
diff --git a/net/filter.c b/net/filter.c
index 147c57f7a7..5d5022fc02 100644
--- a/net/filter.c
+++ b/net/filter.c
@@ -14,6 +14,7 @@
#include "net/net.h"
#include "net/vhost_net.h"
#include "qom/object_interfaces.h"
+#include "qemu/iov.h"
ssize_t qemu_netfilter_receive(NetFilterState *nf,
NetFilterDirection direction,
@@ -32,6 +33,63 @@ ssize_t qemu_netfilter_receive(NetFilterState *nf,
return 0;
}
+ssize_t qemu_netfilter_pass_to_next(NetClientState *sender,
+ unsigned flags,
+ const struct iovec *iov,
+ int iovcnt,
+ void *opaque)
+{
+ int ret = 0;
+ int direction;
+ NetFilterState *nf = opaque;
+ NetFilterState *next = QTAILQ_NEXT(nf, next);
+
+ if (!sender || !sender->peer) {
+ /* no receiver, or sender been deleted, no need to pass it further */
+ goto out;
+ }
+
+ if (nf->direction == NET_FILTER_DIRECTION_ALL) {
+ if (sender == nf->netdev) {
+ /* This packet is sent by netdev itself */
+ direction = NET_FILTER_DIRECTION_TX;
+ } else {
+ direction = NET_FILTER_DIRECTION_RX;
+ }
+ } else {
+ direction = nf->direction;
+ }
+
+ while (next) {
+ /*
+ * if qemu_netfilter_pass_to_next been called, means that
+ * the packet has been hold by filter and has already retured size
+ * to the sender, so sent_cb shouldn't be called later, just
+ * pass NULL to next.
+ */
+ ret = qemu_netfilter_receive(next, direction, sender, flags, iov,
+ iovcnt, NULL);
+ if (ret) {
+ return ret;
+ }
+ next = QTAILQ_NEXT(next, next);
+ }
+
+ /*
+ * We have gone through all filters, pass it to receiver.
+ * Do the valid check again incase sender or receiver been
+ * deleted while we go through filters.
+ */
+ if (sender && sender->peer) {
+ qemu_net_queue_send_iov(sender->peer->incoming_queue,
+ sender, flags, iov, iovcnt, NULL);
+ }
+
+out:
+ /* no receiver, or sender been deleted */
+ return iov_size(iov, iovcnt);
+}
+
static char *netfilter_get_netdev_id(Object *obj, Error **errp)
{
NetFilterState *nf = NETFILTER(obj);