Good morning.
I have written a kernel function which needs to get the IP address of
an active network interface
given its name.
The actual implementation i have done is like this
but i suspect this does not always work.
Is there any API already provided by the kernel to do the same?
Thanks a lot
Giacomo
-- actual implementation: ---
/* returns in *addr the internet address having the name ifname */
int get_ifaddr_by_name(const char *ifname, __u32 * addr)
{
struct net_device *pnet_device;
struct in_device *pin_device;
struct in_ifaddr* inet_ifaddr;
read_lock_bh(&dev_base_lock);
#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,22)
pnet_device = dev_base;
#else
pnet_device = first_net_device();
#endif
while (pnet_device != NULL)
{
if ((netif_running(pnet_device))
&& (pnet_device->ip_ptr != NULL)
&& (strcmp(pnet_device->name, ifname) == 0))
{
pin_device =
(struct in_device *) pnet_device->ip_ptr;
inet_ifaddr = pin_device->ifa_list;
if(inet_ifaddr == NULL)
{
printk("ifa_list is null!\n");
break;
}
/* ifa_local: ifa_address is the remote point in ppp */
*addr = (inet_ifaddr->ifa_local);
read_unlock_bh(&dev_base_lock);
return 1;
}
#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,22)
pnet_device = pnet_device->next;
#else
pnet_device = next_net_device(pnet_device);
#endif
}
read_unlock_bh(&dev_base_lock);
return -1; /* address not found! */
}
--
Giacomo S.
http://www.giacomos.it
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IPFIREwall (http://www.giacomos.it/ipfire) viene presentato
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Linux Day 2006:
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