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Networking: Eliminate recursion from the local loopback driver

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This commit is contained in:
Gregory Nutt
2015-08-24 15:16:03 -06:00
parent d99e217906
commit 4d040d572a
2 changed files with 14 additions and 32 deletions
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arch
+1 -1
Submodule arch updated: 575acae66e...5336c64638
drivers/net/loopback.c
+13 -31
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@@ -161,53 +161,35 @@ static int lo_rmmac(FAR struct net_driver_s *dev, FAR const uint8_t *mac);
static void lo_loopback(FAR struct lo_driver_s *priv)
{
#ifdef CONFIG_NET_PKT
/* When packet sockets are enabled, feed the frame into the packet tap */
/* Loop while there is data "sent", i.e., while d_len > 0. That should be
* the case upon entry here and while the processing of the IPv4/6 packet
* generates a new packet to be sent. Sending, of course, just means
* relaying back through the network for this driver.
*/
pkt_input(&priv->lo_dev);
while (priv->lo_dev.d_len > 0)
{
#ifdef CONFIG_NET_PKT
/* When packet sockets are enabled, feed the frame into the packet tap */
pkt_input(&priv->lo_dev);
#endif
/* We only accept IP packets of the configured type and ARP packets */
/* We only accept IP packets of the configured type and ARP packets */
#ifdef CONFIG_NET_IPv4
if ((IPv4BUF->vhl & IP_VERSION_MASK) == IPv4_VERSION)
{
nllvdbg("IPv4 frame\n");
ipv4_input(&priv->lo_dev);
/* If the above function invocation resulted in data that should be
* sent out on the network, the field d_len will set to a value > 0.
*/
if (priv->lo_dev.d_len > 0)
{
/* Loop the packet back to the network.
* REVISIST: The must be a limit to the depth of recursion.
*/
lo_loopback(priv);
}
}
else
#endif
#ifdef CONFIG_NET_IPv6
if ((IPv6BUF->vtc & IP_VERSION_MASK) == IPv46VERSION)
if ((IPv6BUF->vtc & IP_VERSION_MASK) == IPv6_VERSION)
{
nllvdbg("Iv6 frame\n");
ipv6_input(&priv->lo_dev);
/* If the above function invocation resulted in data that should be
* sent out on the network, the field d_len will set to a value > 0.
*/
if (priv->lo_dev.d_len > 0)
{
/* Loop the packet back to the netork
* REVISIST: The must be a limit to the depth of recursion.
*/
lo_loopback(priv);
}
}
else
#endif