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1 | /* |
2 | * Event system | |
4855d25b JB |
3 | * Also see comments in public header file and longer explanation below. |
4 | * | |
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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> | |
4855d25b JB |
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. | |
370121e5 | 19 | * |
4855d25b JB |
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 | /* | |
370121e5 JB |
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: | |
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41 | * SCAN_FINISHED, |
42 | * DISASSOCIATED: NULL | |
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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] = { | |
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63 | NULL, /* scan finished */ |
64 | NULL, /* associated */ | |
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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", | |
921a91ef | 71 | NULL, /* disassociated */ |
370121e5 JB |
72 | }; |
73 | ||
74 | ||
75 | static void | |
c4028958 | 76 | ieee80211softmac_notify_callback(struct work_struct *work) |
370121e5 | 77 | { |
c4028958 DH |
78 | struct ieee80211softmac_event *pevent = |
79 | container_of(work, struct ieee80211softmac_event, work.work); | |
80 | struct ieee80211softmac_event event = *pevent; | |
81 | kfree(pevent); | |
370121e5 | 82 | |
6ae15df1 | 83 | event.fun(event.mac->dev, event.event_type, event.context); |
370121e5 JB |
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; | |
c4028958 | 104 | INIT_DELAYED_WORK(&eventptr->work, ieee80211softmac_notify_callback); |
370121e5 JB |
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; | |
feeeaa87 | 135 | struct ieee80211softmac_network *network; |
370121e5 JB |
136 | |
137 | if (event >= 0) { | |
feeeaa87 JB |
138 | union iwreq_data wrqu; |
139 | int we_event; | |
140 | char *msg = NULL; | |
141 | ||
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142 | memset(&wrqu, '\0', sizeof (union iwreq_data)); |
143 | ||
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144 | switch(event) { |
145 | case IEEE80211SOFTMAC_EVENT_ASSOCIATED: | |
146 | network = (struct ieee80211softmac_network *)event_ctx; | |
feeeaa87 | 147 | memcpy(wrqu.ap_addr.sa_data, &network->bssid[0], ETH_ALEN); |
921a91ef | 148 | /* fall through */ |
feeeaa87 | 149 | case IEEE80211SOFTMAC_EVENT_DISASSOCIATED: |
feeeaa87 JB |
150 | wrqu.ap_addr.sa_family = ARPHRD_ETHER; |
151 | we_event = SIOCGIWAP; | |
152 | break; | |
6788a07f | 153 | case IEEE80211SOFTMAC_EVENT_SCAN_FINISHED: |
6788a07f JB |
154 | we_event = SIOCGIWSCAN; |
155 | break; | |
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156 | default: |
157 | msg = event_descriptions[event]; | |
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158 | if (!msg) |
159 | msg = "SOFTMAC EVENT BUG"; | |
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160 | wrqu.data.length = strlen(msg); |
161 | we_event = IWEVCUSTOM; | |
162 | break; | |
163 | } | |
164 | wireless_send_event(mac->dev, we_event, &wrqu, msg); | |
370121e5 JB |
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); | |
6ae15df1 DD |
172 | /* User may have subscribed to ANY event, so |
173 | * we tell them which event triggered it. */ | |
174 | eventptr->event_type = event; | |
c4028958 | 175 | schedule_delayed_work(&eventptr->work, 0); |
370121e5 JB |
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 | } |