status_t
arp_control(net_datalink_protocol *_protocol, int32 op, void *argument,
size_t length)
{
arp_protocol *protocol = (arp_protocol *)_protocol;
if (op == SIOCSIFADDR && (protocol->interface->flags & IFF_UP) != 0) {
// The interface may get a new address, so we need to update our
// local entries.
in_addr_t oldAddress = 0;
if (protocol->interface->address != NULL) {
oldAddress
= ((sockaddr_in *)protocol->interface->address)->sin_addr.s_addr;
}
status_t status = protocol->next->module->control(protocol->next,
SIOCSIFADDR, argument, length);
if (status < B_OK)
return status;
MutexLocker locker(sCacheLock);
arp_update_local(protocol);
if (oldAddress == ((sockaddr_in *)
protocol->interface->address)->sin_addr.s_addr)
return B_OK;
// remove previous address from cache
arp_entry *entry = arp_entry::Lookup(oldAddress);
if (entry != NULL) {
hash_remove(sCache, entry);
entry->flags |= ARP_FLAG_REMOVED;
locker.Unlock();
delete entry;
}
return B_OK;
}
return protocol->next->module->control(protocol->next,
op, argument, length);
}
status_t
arp_up(net_datalink_protocol* _protocol)
{
arp_protocol* protocol = (arp_protocol*)_protocol;
status_t status = protocol->next->module->interface_up(protocol->next);
if (status != B_OK)
return status;
// cache this device's address for later use
status = arp_update_local(protocol);
if (status != B_OK) {
protocol->next->module->interface_down(protocol->next);
return status;
}
return B_OK;
}
