mac80211: don't try to do anything on unchanged genIE
[linux-2.6] / net / mac80211 / event.c
1 /*
2  * Copyright 2007       Johannes Berg <johannes@sipsolutions.net>
3  *
4  * This program is free software; you can redistribute it and/or modify
5  * it under the terms of the GNU General Public License version 2 as
6  * published by the Free Software Foundation.
7  *
8  * mac80211 - events
9  */
10
11 #include <net/iw_handler.h>
12 #include "ieee80211_i.h"
13
14 /*
15  * Indicate a failed Michael MIC to userspace. If the caller knows the TSC of
16  * the frame that generated the MIC failure (i.e., if it was provided by the
17  * driver or is still in the frame), it should provide that information.
18  */
19 void mac80211_ev_michael_mic_failure(struct ieee80211_sub_if_data *sdata, int keyidx,
20                                      struct ieee80211_hdr *hdr, const u8 *tsc)
21 {
22         union iwreq_data wrqu;
23         char *buf = kmalloc(128, GFP_ATOMIC);
24
25         if (buf) {
26                 /* TODO: needed parameters: count, key type, TSC */
27                 sprintf(buf, "MLME-MICHAELMICFAILURE.indication("
28                         "keyid=%d %scast addr=%pM)",
29                         keyidx, hdr->addr1[0] & 0x01 ? "broad" : "uni",
30                         hdr->addr2);
31                 memset(&wrqu, 0, sizeof(wrqu));
32                 wrqu.data.length = strlen(buf);
33                 wireless_send_event(sdata->dev, IWEVCUSTOM, &wrqu, buf);
34                 kfree(buf);
35         }
36
37         cfg80211_michael_mic_failure(sdata->dev, hdr->addr2,
38                                      (hdr->addr1[0] & 0x01) ?
39                                      NL80211_KEYTYPE_GROUP :
40                                      NL80211_KEYTYPE_PAIRWISE,
41                                      keyidx, tsc);
42 }