drivers/staging/csr/inet.c

   1 /*
   2  * ---------------------------------------------------------------------------
   3  *  FILE:     inet.c
   4  *
   5  *  PURPOSE:
   6  *      Routines related to IP address changes.
   7  *      Optional part of the porting exercise. It uses system network
   8  *      handlers to obtain the UniFi IP address and pass it to the SME
   9  *      using the unifi_sys_ip_configured_ind().
  10  *
  11  * Copyright (C) 2008-2009 Cambridge Silicon Radio Ltd.
  12  *
  13  * Refer to LICENSE.txt included with this source code for details on
  14  * the license terms.
  15  *
  16  * ---------------------------------------------------------------------------
  17  */
  18 #include <linux/inetdevice.h>
  19 #include <linux/notifier.h>
  20
  21 #include "unifi_priv.h"
  22 #include "csr_wifi_hip_conversions.h"
  23
  24 /*
  25  * The inet notifier is global and not per-netdev.  To avoid having a
  26  * notifier registered when there are no unifi devices present, it's
  27  * registered after the first unifi network device is registered, and
  28  * unregistered when the last unifi network device is unregistered.
  29  */
  30
  31 static atomic_t inet_notif_refs = ATOMIC_INIT(0);
  32
  33 static int uf_inetaddr_event(struct notifier_block *notif, unsigned long event, void *ifa)
  34 {
  35     struct net_device *ndev;
  36     unifi_priv_t *priv;
  37     struct in_ifaddr *if_addr;
  38     netInterface_priv_t *InterfacePriv = (netInterface_priv_t *)NULL;
  39
  40     if (!ifa || !((struct in_ifaddr *)ifa)->ifa_dev) {
  41         unifi_trace(NULL, UDBG1, "uf_inetaddr_event (%lu) ifa=%p\n", event, ifa);
  42         return NOTIFY_DONE;
  43     }
  44
  45     ndev = ((struct in_ifaddr *)ifa)->ifa_dev->dev;
  46     InterfacePriv = (netInterface_priv_t*) netdev_priv(ndev);
  47
  48     /* As the notifier is global, the call may be for a non-UniFi netdev.
  49      * Therefore check the netdev_priv to make sure it's a known UniFi one.
  50      */
  51     if (uf_find_netdev_priv(InterfacePriv) == -1) {
  52         unifi_trace(NULL, UDBG1, "uf_inetaddr_event (%lu) ndev=%p, other netdev_priv=%p\n",
  53                     event, ndev, InterfacePriv);
  54         return NOTIFY_DONE;
  55     }
  56
  57     if (!InterfacePriv->privPtr) {
  58         unifi_error(NULL, "uf_inetaddr_event null priv (%lu) ndev=%p, InterfacePriv=%p\n",
  59                     event, ndev, InterfacePriv);
  60         return NOTIFY_DONE;
  61     }
  62
  63     priv = InterfacePriv->privPtr;
  64     if_addr = (struct in_ifaddr *)ifa;
  65
  66     /* If this event is for a UniFi device, notify the SME that an IP
  67      * address has been added or removed. */
  68     if (uf_find_priv(priv) != -1) {
  69         switch (event) {
  70             case NETDEV_UP:
  71                 unifi_info(priv, "IP address assigned for %s\n", priv->netdev[InterfacePriv->InterfaceTag]->name);
  72                 priv->sta_ip_address = if_addr->ifa_address;
  73 #ifdef CSR_SUPPORT_WEXT
  74                 sme_mgt_packet_filter_set(priv);
  75 #endif
  76                 break;
  77             case NETDEV_DOWN:
  78                 unifi_info(priv, "IP address removed for %s\n", priv->netdev[InterfacePriv->InterfaceTag]->name);
  79                 priv->sta_ip_address = 0xFFFFFFFF;
  80 #ifdef CSR_SUPPORT_WEXT
  81                 sme_mgt_packet_filter_set(priv);
  82 #endif
  83                 break;
  84         }
  85     }
  86
  87     return NOTIFY_DONE;
  88 }
  89
  90 static struct notifier_block uf_inetaddr_notifier = {
  91     .notifier_call = uf_inetaddr_event,
  92 };
  93
  94 void uf_register_inet_notifier(void)
  95 {
  96         if (atomic_inc_return(&inet_notif_refs) == 1)
  97                 register_inetaddr_notifier(&uf_inetaddr_notifier);
  98 }
  99
 100 void uf_unregister_inet_notifier(void)
 101 {
 102         if (atomic_dec_return(&inet_notif_refs) == 0)
 103                 unregister_inetaddr_notifier(&uf_inetaddr_notifier);
 104 }