Capture packets that will be sent.
Signed-off-by: Yang Hongyang <yan...@cn.fujitsu.com>
---
net/net.c | 66 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++-
1 file changed, 65 insertions(+), 1 deletion(-)
diff --git a/net/net.c b/net/net.c
index 03b2296..efccd56 100644
--- a/net/net.c
+++ b/net/net.c
@@ -569,6 +569,42 @@ int qemu_can_send_packet(NetClientState *sender)
return 1;
}
+static ssize_t filter_receive_iov(NetClientState *nc, int chain,
+ NetClientState *sender,
+ unsigned flags,
+ const struct iovec *iov,
+ int iovcnt)
+{
+ ssize_t ret = 0;
+ NetFilterState *nf = NULL;
+ ssize_t size = iov_size(iov, iovcnt);
+
+ QTAILQ_FOREACH(nf, &nc->filters, next) {
+ if (nf->chain == chain || nf->chain == NET_FILTER_ALL) {
+ ret = nf->info->receive_iov(nf, sender, flags, iov, iovcnt);
+ if (ret == size) {
+ return ret;
+ }
+ }
+ }
+
+ return ret;
+}
+
+static ssize_t filter_receive(NetClientState *nc, int chain,
+ NetClientState *sender,
+ unsigned flags,
+ const uint8_t *data,
+ size_t size)
+{
+ struct iovec iov = {
+ .iov_base = (void *)data,
+ .iov_len = size
+ };
+
+ return filter_receive_iov(nc, chain, sender, flags, &iov, 1);
+}
+
ssize_t qemu_deliver_packet(NetClientState *sender,
unsigned flags,
const uint8_t *data,
@@ -640,6 +676,7 @@ static ssize_t
qemu_send_packet_async_with_flags(NetClientState *sender,
NetPacketSent *sent_cb)
{
NetQueue *queue;
+ int ret;
#ifdef DEBUG_NET
printf("qemu_send_packet_async:\n");
@@ -650,6 +687,18 @@ static ssize_t
qemu_send_packet_async_with_flags(NetClientState *sender,
return size;
}
+ /* Let filters handle the packet first */
+ ret = filter_receive(sender, NET_FILTER_OUT, sender, flags, buf, size);
+ if (ret == size) {
+ return size;
+ }
+
+ ret = filter_receive(sender->peer, NET_FILTER_IN,
+ sender, flags, buf, size);
+ if (ret == size) {
+ return size;
+ }
+
queue = sender->peer->incoming_queue;
return qemu_net_queue_send(queue, sender, flags, buf, size, sent_cb);
@@ -720,9 +769,24 @@ ssize_t qemu_sendv_packet_async(NetClientState *sender,
NetPacketSent *sent_cb)
{
NetQueue *queue;
+ int size = iov_size(iov, iovcnt);
+ int ret;
if (sender->link_down || !sender->peer) {
- return iov_size(iov, iovcnt);
+ return size;
+ }
+
+ /* Let filters handle the packet first */
+ ret = filter_receive_iov(sender, NET_FILTER_OUT,
+ sender, QEMU_NET_PACKET_FLAG_NONE, iov, iovcnt);
+ if (ret == size) {
+ return size;
+ }
+
+ ret = filter_receive_iov(sender->peer, NET_FILTER_IN,
+ sender, QEMU_NET_PACKET_FLAG_NONE, iov, iovcnt);
+ if (ret == size) {
+ return size;
}
queue = sender->peer->incoming_queue;
--
1.9.1
