2012-06-19 23:15:42 +00:00
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/*
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* ---------------------------------------------------------------------------
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* FILE: inet.c
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*
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* PURPOSE:
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* Routines related to IP address changes.
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* Optional part of the porting exercise. It uses system network
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* handlers to obtain the UniFi IP address and pass it to the SME
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* using the unifi_sys_ip_configured_ind().
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*
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* Copyright (C) 2008-2009 Cambridge Silicon Radio Ltd.
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*
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* Refer to LICENSE.txt included with this source code for details on
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* the license terms.
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*
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* ---------------------------------------------------------------------------
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*/
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#include <linux/inetdevice.h>
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#include <linux/notifier.h>
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#include "unifi_priv.h"
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#include "csr_wifi_hip_conversions.h"
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/*
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* The inet notifier is global and not per-netdev. To avoid having a
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* notifier registered when there are no unifi devices present, it's
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* registered after the first unifi network device is registered, and
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* unregistered when the last unifi network device is unregistered.
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*/
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static atomic_t inet_notif_refs = ATOMIC_INIT(0);
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static int uf_inetaddr_event(struct notifier_block *notif, unsigned long event, void *ifa)
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{
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struct net_device *ndev;
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unifi_priv_t *priv;
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struct in_ifaddr *if_addr;
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netInterface_priv_t *InterfacePriv = (netInterface_priv_t *)NULL;
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if (!ifa || !((struct in_ifaddr *)ifa)->ifa_dev) {
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unifi_trace(NULL, UDBG1, "uf_inetaddr_event (%lu) ifa=%p\n", event, ifa);
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return NOTIFY_DONE;
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}
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ndev = ((struct in_ifaddr *)ifa)->ifa_dev->dev;
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InterfacePriv = (netInterface_priv_t*) netdev_priv(ndev);
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/* As the notifier is global, the call may be for a non-UniFi netdev.
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* Therefore check the netdev_priv to make sure it's a known UniFi one.
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*/
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if (uf_find_netdev_priv(InterfacePriv) == -1) {
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unifi_trace(NULL, UDBG1, "uf_inetaddr_event (%lu) ndev=%p, other netdev_priv=%p\n",
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event, ndev, InterfacePriv);
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return NOTIFY_DONE;
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}
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if (!InterfacePriv->privPtr) {
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unifi_error(NULL, "uf_inetaddr_event null priv (%lu) ndev=%p, InterfacePriv=%p\n",
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event, ndev, InterfacePriv);
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return NOTIFY_DONE;
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}
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priv = InterfacePriv->privPtr;
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if_addr = (struct in_ifaddr *)ifa;
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/* If this event is for a UniFi device, notify the SME that an IP
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* address has been added or removed. */
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if (uf_find_priv(priv) != -1) {
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switch (event) {
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case NETDEV_UP:
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unifi_info(priv, "IP address assigned for %s\n", priv->netdev[InterfacePriv->InterfaceTag]->name);
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priv->sta_ip_address = if_addr->ifa_address;
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#ifdef CSR_SUPPORT_WEXT
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sme_mgt_packet_filter_set(priv);
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#endif
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break;
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case NETDEV_DOWN:
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unifi_info(priv, "IP address removed for %s\n", priv->netdev[InterfacePriv->InterfaceTag]->name);
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priv->sta_ip_address = 0xFFFFFFFF;
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#ifdef CSR_SUPPORT_WEXT
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sme_mgt_packet_filter_set(priv);
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#endif
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break;
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}
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}
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return NOTIFY_DONE;
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}
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static struct notifier_block uf_inetaddr_notifier = {
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.notifier_call = uf_inetaddr_event,
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};
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void uf_register_inet_notifier(void)
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{
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2012-11-01 06:24:36 +00:00
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if (atomic_inc_return(&inet_notif_refs) == 1)
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register_inetaddr_notifier(&uf_inetaddr_notifier);
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2012-06-19 23:15:42 +00:00
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}
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void uf_unregister_inet_notifier(void)
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{
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2012-11-01 06:24:36 +00:00
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if (atomic_dec_return(&inet_notif_refs) == 0)
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unregister_inetaddr_notifier(&uf_inetaddr_notifier);
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2012-06-19 23:15:42 +00:00
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}
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