net/ieee80211/softmac/ieee80211softmac_event.c

   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:      no special meaning
  42  *  ASSOCIATED,
  43  *  ASSOCIATE_FAILED,
  44  *  ASSOCIATE_TIMEOUT,
  45  *  AUTHENTICATED,
  46  *  AUTH_FAILED,
  47  *  AUTH_TIMEOUT:       a pointer to the network struct
  48  * ...
  49  * Code within this module can use the event context to be only
  50  * called when the event is true for that specific context
  51  * as per above table.
  52  * If the event context is NULL, then the notification is always called,
  53  * regardless of the event context. The event context is not passed to
  54  * the callback, it is assumed that the context suffices.
  55  *
  56  * You can also use the event context only by setting the event type
  57  * to -1 (private use only), in which case you'll be notified
  58  * whenever the event context matches.
  59  */
  60
  61 static char *event_descriptions[IEEE80211SOFTMAC_EVENT_LAST+1] = {
  62         "scan finished",
  63         "associated",
  64         "associating failed",
  65         "associating timed out",
  66         "authenticated",
  67         "authenticating failed",
  68         "authenticating timed out",
  69         "associating failed because no suitable network was found",
  70 };
  71
  72
  73 static void
  74 ieee80211softmac_notify_callback(void *d)
  75 {
  76         struct ieee80211softmac_event event = *(struct ieee80211softmac_event*) d;
  77         kfree(d);
  78
  79         event.fun(event.mac->dev, event.context);
  80 }
  81
  82 int
  83 ieee80211softmac_notify_internal(struct ieee80211softmac_device *mac,
  84         int event, void *event_context, notify_function_ptr fun, void *context, gfp_t gfp_mask)
  85 {
  86         struct ieee80211softmac_event *eventptr;
  87         unsigned long flags;
  88
  89         if (event < -1 || event > IEEE80211SOFTMAC_EVENT_LAST)
  90                 return -ENOSYS;
  91
  92         if (!fun)
  93                 return -EINVAL;
  94
  95         eventptr = kmalloc(sizeof(struct ieee80211softmac_event), gfp_mask);
  96         if (!eventptr)
  97                 return -ENOMEM;
  98
  99         eventptr->event_type = event;
 100         INIT_WORK(&eventptr->work, ieee80211softmac_notify_callback, eventptr);
 101         eventptr->fun = fun;
 102         eventptr->context = context;
 103         eventptr->mac = mac;
 104         eventptr->event_context = event_context;
 105
 106         spin_lock_irqsave(&mac->lock, flags);
 107         list_add(&eventptr->list, &mac->events);
 108         spin_unlock_irqrestore(&mac->lock, flags);
 109
 110         return 0;
 111 }
 112
 113 int
 114 ieee80211softmac_notify_gfp(struct net_device *dev,
 115         int event, notify_function_ptr fun, void *context, gfp_t gfp_mask)
 116 {
 117         struct ieee80211softmac_device *mac = ieee80211_priv(dev);
 118
 119         if (event < 0 || event > IEEE80211SOFTMAC_EVENT_LAST)
 120                 return -ENOSYS;
 121
 122         return ieee80211softmac_notify_internal(mac, event, NULL, fun, context, gfp_mask);
 123 }
 124 EXPORT_SYMBOL_GPL(ieee80211softmac_notify_gfp);
 125
 126 /* private -- calling all callbacks that were specified */
 127 void
 128 ieee80211softmac_call_events_locked(struct ieee80211softmac_device *mac, int event, void *event_ctx)
 129 {
 130         struct ieee80211softmac_event *eventptr, *tmp;
 131         union iwreq_data wrqu;
 132         char *msg;
 133
 134         if (event >= 0) {
 135                 msg = event_descriptions[event];
 136                 wrqu.data.length = strlen(msg);
 137                 wireless_send_event(mac->dev, IWEVCUSTOM, &wrqu, msg);
 138         }
 139
 140         if (!list_empty(&mac->events))
 141                 list_for_each_entry_safe(eventptr, tmp, &mac->events, list) {
 142                         if ((eventptr->event_type == event || eventptr->event_type == -1)
 143                                 && (eventptr->event_context == NULL || eventptr->event_context == event_ctx)) {
 144                                 list_del(&eventptr->list);
 145                                 schedule_work(&eventptr->work);
 146                         }
 147                 }
 148 }
 149
 150 void
 151 ieee80211softmac_call_events(struct ieee80211softmac_device *mac, int event, void *event_ctx)
 152 {
 153         unsigned long flags;
 154
 155         spin_lock_irqsave(&mac->lock, flags);
 156         ieee80211softmac_call_events_locked(mac, event, event_ctx);
 157
 158         spin_unlock_irqrestore(&mac->lock, flags);
 159 }