1 /*
2 * Event system
3 * Also see comments in public header file and longer explanation below.
4 *
5 * Copyright (c) 2005, 2006 Johannes Berg <johannes@sipsolutions.net>
6 * Joseph Jezak <josejx@gentoo.org>
7 * Larry Finger <Larry.Finger@lwfinger.net>
8 * Danny van Dyk <kugelfang@gentoo.org>
9 * Michael Buesch <mbuesch@freenet.de>
10 *
11 * This program is free software; you can redistribute it and/or modify it
12 * under the terms of version 2 of the GNU General Public License as
13 * published by the Free Software Foundation.
14 *
15 * This program is distributed in the hope that it will be useful, but WITHOUT
16 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
17 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
18 * more details.
19 *
20 * You should have received a copy of the GNU General Public License
21 * along with this program; if not, write to the Free Software
22 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
23 *
24 * The full GNU General Public License is included in this distribution in the
25 * file called COPYING.
26 */
27
28 #include "ieee80211softmac_priv.h"
29
30 /*
31 * Each event has associated to it
32 * - an event type (see constants in public header)
33 * - an event context (see below)
34 * - the function to be called
35 * - a context (extra parameter to call the function with)
36 * - and the softmac struct
37 *
38 * The event context is private and can only be used from
39 * within this module. Its meaning varies with the event
40 * type:
41 * SCAN_FINISHED,
42 * DISASSOCIATED: NULL
43 * ASSOCIATED,
44 * ASSOCIATE_FAILED,
45 * ASSOCIATE_TIMEOUT,
46 * AUTHENTICATED,
47 * AUTH_FAILED,
48 * AUTH_TIMEOUT: a pointer to the network struct
49 * ...
50 * Code within this module can use the event context to be only
51 * called when the event is true for that specific context
52 * as per above table.
53 * If the event context is NULL, then the notification is always called,
54 * regardless of the event context. The event context is not passed to
55 * the callback, it is assumed that the context suffices.
56 *
57 * You can also use the event context only by setting the event type
58 * to -1 (private use only), in which case you'll be notified
59 * whenever the event context matches.
60 */
61
62 static char *event_descriptions[IEEE80211SOFTMAC_EVENT_LAST+1] = {
63 NULL, /* scan finished */
64 NULL, /* associated */
65 "associating failed",
66 "associating timed out",
67 "authenticated",
68 "authenticating failed",
69 "authenticating timed out",
70 "associating failed because no suitable network was found",
71 NULL, /* disassociated */
72 };
73
74
75 static void
76 ieee80211softmac_notify_callback(struct work_struct *work)
77 {
78 struct ieee80211softmac_event *pevent =
79 container_of(work, struct ieee80211softmac_event, work.work);
80 struct ieee80211softmac_event event = *pevent;
81 kfree(pevent);
82
83 event.fun(event.mac->dev, event.event_type, event.context);
84 }
85
86 int
87 ieee80211softmac_notify_internal(struct ieee80211softmac_device *mac,
88 int event, void *event_context, notify_function_ptr fun, void *context, gfp_t gfp_mask)
89 {
90 struct ieee80211softmac_event *eventptr;
91 unsigned long flags;
92
93 if (event < -1 || event > IEEE80211SOFTMAC_EVENT_LAST)
94 return -ENOSYS;
95
96 if (!fun)
97 return -EINVAL;
98
99 eventptr = kmalloc(sizeof(struct ieee80211softmac_event), gfp_mask);
100 if (!eventptr)
101 return -ENOMEM;
102
103 eventptr->event_type = event;
104 INIT_DELAYED_WORK(&eventptr->work, ieee80211softmac_notify_callback);
105 eventptr->fun = fun;
106 eventptr->context = context;
107 eventptr->mac = mac;
108 eventptr->event_context = event_context;
109
110 spin_lock_irqsave(&mac->lock, flags);
111 list_add(&eventptr->list, &mac->events);
112 spin_unlock_irqrestore(&mac->lock, flags);
113
114 return 0;
115 }
116
117 int
118 ieee80211softmac_notify_gfp(struct net_device *dev,
119 int event, notify_function_ptr fun, void *context, gfp_t gfp_mask)
120 {
121 struct ieee80211softmac_device *mac = ieee80211_priv(dev);
122
123 if (event < 0 || event > IEEE80211SOFTMAC_EVENT_LAST)
124 return -ENOSYS;
125
126 return ieee80211softmac_notify_internal(mac, event, NULL, fun, context, gfp_mask);
127 }
128 EXPORT_SYMBOL_GPL(ieee80211softmac_notify_gfp);
129
130 /* private -- calling all callbacks that were specified */
131 void
132 ieee80211softmac_call_events_locked(struct ieee80211softmac_device *mac, int event, void *event_ctx)
133 {
134 struct ieee80211softmac_event *eventptr, *tmp;
135 struct ieee80211softmac_network *network;
136
137 if (event >= 0) {
138 union iwreq_data wrqu;
139 int we_event;
140 char *msg = NULL;
141
142 memset(&wrqu, '\0', sizeof (union iwreq_data));
143
144 switch(event) {
145 case IEEE80211SOFTMAC_EVENT_ASSOCIATED:
146 network = (struct ieee80211softmac_network *)event_ctx;
147 memcpy(wrqu.ap_addr.sa_data, &network->bssid[0], ETH_ALEN);
148 /* fall through */
149 case IEEE80211SOFTMAC_EVENT_DISASSOCIATED:
150 wrqu.ap_addr.sa_family = ARPHRD_ETHER;
151 we_event = SIOCGIWAP;
152 break;
153 case IEEE80211SOFTMAC_EVENT_SCAN_FINISHED:
154 we_event = SIOCGIWSCAN;
155 break;
156 default:
157 msg = event_descriptions[event];
158 if (!msg)
159 msg = "SOFTMAC EVENT BUG";
160 wrqu.data.length = strlen(msg);
161 we_event = IWEVCUSTOM;
162 break;
163 }
164 wireless_send_event(mac->dev, we_event, &wrqu, msg);
165 }
166
167 if (!list_empty(&mac->events))
168 list_for_each_entry_safe(eventptr, tmp, &mac->events, list) {
169 if ((eventptr->event_type == event || eventptr->event_type == -1)
170 && (eventptr->event_context == NULL || eventptr->event_context == event_ctx)) {
171 list_del(&eventptr->list);
172 /* User may have subscribed to ANY event, so
173 * we tell them which event triggered it. */
174 eventptr->event_type = event;
175 queue_delayed_work(mac->wq, &eventptr->work, 0);
176 }
177 }
178 }
179
180 void
181 ieee80211softmac_call_events(struct ieee80211softmac_device *mac, int event, void *event_ctx)
182 {
183 unsigned long flags;
184
185 spin_lock_irqsave(&mac->lock, flags);
186 ieee80211softmac_call_events_locked(mac, event, event_ctx);
187
188 spin_unlock_irqrestore(&mac->lock, flags);
189 }
190
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