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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
This commit is contained in:
aliguori 2009-02-05 22:36:24 +00:00
parent 002437cd42
commit 3831ab2094
1 changed files with 28 additions and 0 deletions
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28
hw/virtio-net.c
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@ -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);