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,
  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                                 schedule_delayed_work(&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 }