diff options
| -rw-r--r-- | hw/virtio-net.c | 28 |
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); |