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mac80211: Use IWEVASSOCREQIE instead of IWEVCUSTOM

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The previous code was using IWEVCUSTOM to report IEs from AssocReq and
AssocResp frames into user space. This can easily hit the 256 byte
limit (IW_CUSTOM_MAX) with APs that include number of vendor IEs in
AssocResp. This results in the event message not being sent and dmesg
showing "wlan0 (WE) : Wireless Event too big (366)" type of errors.

Convert mac80211 to use IWEVASSOCREQIE/IWEVASSOCRESPIE to avoid the
issue of being unable to send association IEs as wireless events. These
newer event types use binary encoding and larger maximum size
(IW_GENERIC_IE_MAX = 1024), so the likelyhood of not being able to send
the IEs is much smaller than with IWEVCUSTOM. As an extra benefit, the
code is also quite a bit simpler since there is no need to allocate an
extra buffer for hex encoding.

Signed-off-by: Jouni Malinen <jouni.malinen@atheros.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
This commit is contained in:
Jouni Malinen 2008-08-19 10:54:32 +03:00 committed by John W. Linville
parent 988b02f1bf
commit 087d833e5a
1 changed files with 9 additions and 39 deletions
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48
net/mac80211/mlme.c
View file

@ -478,51 +478,21 @@ int ieee80211_ht_addt_info_ie_to_ht_bss_info(
static void ieee80211_sta_send_associnfo(struct net_device *dev,
struct ieee80211_if_sta *ifsta)
{
char *buf;
size_t len;
int i;
union iwreq_data wrqu;
if (!ifsta->assocreq_ies && !ifsta->assocresp_ies)
return;
buf = kmalloc(50 + 2 * (ifsta->assocreq_ies_len +
ifsta->assocresp_ies_len), GFP_KERNEL);
if (!buf)
return;
len = sprintf(buf, "ASSOCINFO(");
if (ifsta->assocreq_ies) {
len += sprintf(buf + len, "ReqIEs=");
for (i = 0; i < ifsta->assocreq_ies_len; i++) {
len += sprintf(buf + len, "%02x",
ifsta->assocreq_ies[i]);
}
memset(&wrqu, 0, sizeof(wrqu));
wrqu.data.length = ifsta->assocreq_ies_len;
wireless_send_event(dev, IWEVASSOCREQIE, &wrqu,
ifsta->assocreq_ies);
}
if (ifsta->assocresp_ies) {
if (ifsta->assocreq_ies)
len += sprintf(buf + len, " ");
len += sprintf(buf + len, "RespIEs=");
for (i = 0; i < ifsta->assocresp_ies_len; i++) {
len += sprintf(buf + len, "%02x",
ifsta->assocresp_ies[i]);
}
memset(&wrqu, 0, sizeof(wrqu));
wrqu.data.length = ifsta->assocresp_ies_len;
wireless_send_event(dev, IWEVASSOCRESPIE, &wrqu,
ifsta->assocresp_ies);
}
len += sprintf(buf + len, ")");
if (len > IW_CUSTOM_MAX) {
len = sprintf(buf, "ASSOCRESPIE=");
for (i = 0; i < ifsta->assocresp_ies_len; i++) {
len += sprintf(buf + len, "%02x",
ifsta->assocresp_ies[i]);
}
}
memset(&wrqu, 0, sizeof(wrqu));
wrqu.data.length = len;
wireless_send_event(dev, IWEVCUSTOM, &wrqu, buf);
kfree(buf);
}