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net/netdev_findbyaddr.c: Skip network devices that are in the down state. They have no meaning address

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Gregory Nutt
2014-03-20 17:27:59 -06:00
parent 349f7155c7
commit baa91448e6
3 changed files with 30 additions and 7 deletions
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net/netdev_findbyaddr.c
+26 -6
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@@ -1,7 +1,7 @@
/****************************************************************************
* net/netdev_findbyaddr.c
*
* Copyright (C) 2007-2009 Gregory Nutt. All rights reserved.
* Copyright (C) 2007-2009, 2014 Gregory Nutt. All rights reserved.
* Author: Gregory Nutt <gnutt@nuttx.org>
*
* Redistribution and use in source and binary forms, with or without
@@ -55,7 +55,7 @@
****************************************************************************/
/****************************************************************************
* Priviate Types
* Private Types
****************************************************************************/
/****************************************************************************
@@ -79,7 +79,8 @@
*
* Description:
* Find a previously registered network device by matching a local address
* with the subnet served by the device
* with the subnet served by the device. Only "up" devices are considered
* (since a "down" device has no meaningful address).
*
* Parameters:
* addr - Pointer to the remote address of a connection
@@ -95,17 +96,36 @@
static FAR struct uip_driver_s *netdev_finddevice(const uip_ipaddr_t addr)
{
struct uip_driver_s *dev;
uint8_t iff;
/* Examine each registered network device */
netdev_semtake();
for (dev = g_netdevices; dev; dev = dev->flink)
{
if (uip_ipaddr_maskcmp(dev->d_ipaddr, addr, dev->d_netmask))
/* Get the interface flags */
if (uip_getifstatus(dev->d_ifname, &iff) == OK)
{
netdev_semgive();
return dev;
/* Is the interface in the "up" state? */
if ((iff & IFF_UP) != 0)
{
/* Yes.. check for an address match (under the netmask) */
if (uip_ipaddr_maskcmp(dev->d_ipaddr, addr, dev->d_netmask))
{
/* Its a match */
netdev_semgive();
return dev;
}
}
}
}
/* No device with the matching address found */
netdev_semgive();
return NULL;
}