Root/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
31static atomic_t inet_notif_refs = ATOMIC_INIT(0);
32
33static 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
90static struct notifier_block uf_inetaddr_notifier = {
91    .notifier_call = uf_inetaddr_event,
92};
93
94void 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
101void uf_unregister_inet_notifier(void)
102{
103    if (atomic_dec_return(&inet_notif_refs) == 0) {
104        unregister_inetaddr_notifier(&uf_inetaddr_notifier);
105    }
106}
107

Archive Download this file



interactive