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nl80211: Optional IEs into scan request 

This extends the NL80211_CMD_TRIGGER_SCAN command to allow applications
to specify a set of information element(s) to be added into Probe
Request frames with NL80211_ATTR_IE. This provides support for the
MLME-SCAN.request primitive parameter VendorSpecificInfo and can be
used, e.g., to implement WPS scanning.

Signed-off-by: Jouni Malinen <jouni.malinen@atheros.com>
Acked-by: Johannes Berg <johannes@sipsolutions.net>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
This commit is contained in:
Jouni Malinen 2009-02-16 19:39:13 +02:00 committed by John W. Linville
parent 83befbde83
commit 70692ad292
6 changed files with 38 additions and 8 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

4
include/net/cfg80211.h
View File

@ -525,6 +525,8 @@ struct cfg80211_ssid {
* @n_ssids: number of SSIDs
* @channels: channels to scan on.
* @n_channels: number of channels for each band
* @ie: optional information element(s) to add into Probe Request or %NULL
* @ie_len: length of ie in octets
* @wiphy: the wiphy this was for
* @ifidx: the interface index
*/
@ -533,6 +535,8 @@ struct cfg80211_scan_request {
int n_ssids;
struct ieee80211_channel **channels;
u32 n_channels;
u8 *ie;
size_t ie_len;
/* internal */
struct wiphy *wiphy;

3
net/mac80211/ieee80211_i.h
View File

@ -1093,7 +1093,8 @@ void ieee80211_send_auth(struct ieee80211_sub_if_data *sdata,
u8 *extra, size_t extra_len,
const u8 *bssid, int encrypt);
void ieee80211_send_probe_req(struct ieee80211_sub_if_data *sdata, u8 *dst,
u8 *ssid, size_t ssid_len);
u8 *ssid, size_t ssid_len,
u8 *ie, size_t ie_len);
void ieee80211_sta_def_wmm_params(struct ieee80211_sub_if_data *sdata,
const size_t supp_rates_len,

8
net/mac80211/mlme.c
View File

@ -716,7 +716,7 @@ static void ieee80211_direct_probe(struct ieee80211_sub_if_data *sdata)
* will not answer to direct packet in unassociated state.
*/
ieee80211_send_probe_req(sdata, NULL,
ifmgd->ssid, ifmgd->ssid_len);
ifmgd->ssid, ifmgd->ssid_len, NULL, 0);
mod_timer(&ifmgd->timer, jiffies + IEEE80211_AUTH_TIMEOUT);
}
@ -946,7 +946,8 @@ static void ieee80211_associated(struct ieee80211_sub_if_data *sdata)
} else
ieee80211_send_probe_req(sdata, ifmgd->bssid,
ifmgd->ssid,
ifmgd->ssid_len);
ifmgd->ssid_len,
NULL, 0);
ifmgd->flags ^= IEEE80211_STA_PROBEREQ_POLL;
} else {
ifmgd->flags &= ~IEEE80211_STA_PROBEREQ_POLL;
@ -955,7 +956,8 @@ static void ieee80211_associated(struct ieee80211_sub_if_data *sdata)
ifmgd->last_probe = jiffies;
ieee80211_send_probe_req(sdata, ifmgd->bssid,
ifmgd->ssid,
ifmgd->ssid_len);
ifmgd->ssid_len,
NULL, 0);
}
}
}

3
net/mac80211/scan.c
View File

@ -338,7 +338,8 @@ void ieee80211_scan_work(struct work_struct *work)
ieee80211_send_probe_req(
sdata, NULL,
local->scan_req->ssids[i].ssid,
local->scan_req->ssids[i].ssid_len);
local->scan_req->ssids[i].ssid_len,
local->scan_req->ie, local->scan_req->ie_len);
next_delay = IEEE80211_CHANNEL_TIME;
break;
}

7
net/mac80211/util.c
View File

@ -884,7 +884,8 @@ void ieee80211_send_auth(struct ieee80211_sub_if_data *sdata,
}
void ieee80211_send_probe_req(struct ieee80211_sub_if_data *sdata, u8 *dst,
u8 *ssid, size_t ssid_len)
u8 *ssid, size_t ssid_len,
u8 *ie, size_t ie_len)
{
struct ieee80211_local *local = sdata->local;
struct ieee80211_supported_band *sband;
@ -903,7 +904,7 @@ void ieee80211_send_probe_req(struct ieee80211_sub_if_data *sdata, u8 *dst,
}
skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*mgmt) + 200 +
extra_preq_ie_len);
ie_len + extra_preq_ie_len);
if (!skb) {
printk(KERN_DEBUG "%s: failed to allocate buffer for probe "
"request\n", sdata->dev->name);
@ -950,6 +951,8 @@ void ieee80211_send_probe_req(struct ieee80211_sub_if_data *sdata, u8 *dst,
*pos = rate->bitrate / 5;
}
if (ie)
memcpy(skb_put(skb, ie_len), ie, ie_len);
if (extra_preq_ie)
memcpy(skb_put(skb, extra_preq_ie_len), extra_preq_ie,
extra_preq_ie_len);

21
net/wireless/nl80211.c
View File

@ -2286,6 +2286,7 @@ static int nl80211_trigger_scan(struct sk_buff *skb, struct genl_info *info)
struct wiphy *wiphy;
int err, tmp, n_ssids = 0, n_channels = 0, i;
enum ieee80211_band band;
size_t ie_len;
err = get_drv_dev_by_info_ifindex(info->attrs, &drv, &dev);
if (err)
@ -2327,9 +2328,15 @@ static int nl80211_trigger_scan(struct sk_buff *skb, struct genl_info *info)
goto out_unlock;
}
if (info->attrs[NL80211_ATTR_IE])
ie_len = nla_len(info->attrs[NL80211_ATTR_IE]);
else
ie_len = 0;
request = kzalloc(sizeof(*request)
+ sizeof(*ssid) * n_ssids
+ sizeof(channel) * n_channels, GFP_KERNEL);
+ sizeof(channel) * n_channels
+ ie_len, GFP_KERNEL);
if (!request) {
err = -ENOMEM;
goto out_unlock;
@ -2340,6 +2347,12 @@ static int nl80211_trigger_scan(struct sk_buff *skb, struct genl_info *info)
if (n_ssids)
request->ssids = (void *)(request->channels + n_channels);
request->n_ssids = n_ssids;
if (ie_len) {
if (request->ssids)
request->ie = (void *)(request->ssids + n_ssids);
else
request->ie = (void *)(request->channels + n_channels);
}
if (info->attrs[NL80211_ATTR_SCAN_FREQUENCIES]) {
/* user specified, bail out if channel not found */
@ -2380,6 +2393,12 @@ static int nl80211_trigger_scan(struct sk_buff *skb, struct genl_info *info)
}
}
if (info->attrs[NL80211_ATTR_IE]) {
request->ie_len = nla_len(info->attrs[NL80211_ATTR_IE]);
memcpy(request->ie, nla_data(info->attrs[NL80211_ATTR_IE]),
request->ie_len);
}
request->ifidx = dev->ifindex;
request->wiphy = &drv->wiphy;