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
uf_inetaddr_event(struct notifier_block * notif,unsigned long event,void * ifa)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
uf_register_inet_notifier(void)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
uf_unregister_inet_notifier(void)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 }
105