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authoraliguori <aliguori@c046a42c-6fe2-441c-8c8c-71466251a162>2009-02-05 22:36:24 +0000
committeraliguori <aliguori@c046a42c-6fe2-441c-8c8c-71466251a162>2009-02-05 22:36:24 +0000
commit3831ab2094f6b573617b0f53b663bba1f036dc45 (patch)
tree825a3987bf54240da944203ae1b34675f21642bc /hw/virtio-net.c
parent002437cd42a84261fed26b2d0c3feae0e0c9b241 (diff)
qemu:virtio-net: Enable filtering based on MAC, promisc, broadcast and allmulti (Alex Williamson)
Make use of the new RX_MODE control virtqueue class by dropping packets the guest doesn't want to see. Signed-off-by: Alex Williamson <alex.williamson@hp.com> Signed-off-by: Anthony Liguori <aliguori@us.ibm.com> git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@6538 c046a42c-6fe2-441c-8c8c-71466251a162
Diffstat (limited to 'hw/virtio-net.c')
-rw-r--r--hw/virtio-net.c28
1 files changed, 28 insertions, 0 deletions
diff --git a/hw/virtio-net.c b/hw/virtio-net.c
index 7e130f740d..001169d7a2 100644
--- a/hw/virtio-net.c
+++ b/hw/virtio-net.c
@@ -222,6 +222,31 @@ static int receive_header(VirtIONet *n, struct iovec *iov, int iovcnt,
return offset;
}
+static int receive_filter(VirtIONet *n, const uint8_t *buf, int size)
+{
+ static const uint8_t bcast[] = {0xff, 0xff, 0xff, 0xff, 0xff, 0xff};
+ uint8_t *ptr = (uint8_t *)buf;
+
+ if (n->promisc)
+ return 1;
+
+#ifdef TAP_VNET_HDR
+ if (tap_has_vnet_hdr(n->vc->vlan->first_client))
+ ptr += sizeof(struct virtio_net_hdr);
+#endif
+
+ if ((ptr[0] & 1) && n->allmulti)
+ return 1;
+
+ if (!memcmp(ptr, bcast, sizeof(bcast)))
+ return 1;
+
+ if (!memcmp(ptr, n->mac, ETH_ALEN))
+ return 1;
+
+ return 0;
+}
+
static void virtio_net_receive(void *opaque, const uint8_t *buf, int size)
{
VirtIONet *n = opaque;
@@ -231,6 +256,9 @@ static void virtio_net_receive(void *opaque, const uint8_t *buf, int size)
if (!do_virtio_net_can_receive(n, size))
return;
+ if (!receive_filter(n, buf, size))
+ return;
+
/* hdr_len refers to the header we supply to the guest */
hdr_len = n->mergeable_rx_bufs ?
sizeof(struct virtio_net_hdr_mrg_rxbuf) : sizeof(struct virtio_net_hdr);