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>
diff --git a/include/net/cfg80211.h b/include/net/cfg80211.h
index c0d1f5b..33f43b0 100644
--- a/include/net/cfg80211.h
+++ b/include/net/cfg80211.h
@@ -525,6 +525,8 @@
* @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 @@
int n_ssids;
struct ieee80211_channel **channels;
u32 n_channels;
+ u8 *ie;
+ size_t ie_len;
/* internal */
struct wiphy *wiphy;
diff --git a/net/mac80211/ieee80211_i.h b/net/mac80211/ieee80211_i.h
index 27d5641..d06c757 100644
--- a/net/mac80211/ieee80211_i.h
+++ b/net/mac80211/ieee80211_i.h
@@ -1093,7 +1093,8 @@
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,
diff --git a/net/mac80211/mlme.c b/net/mac80211/mlme.c
index ec5a090..5a49779 100644
--- a/net/mac80211/mlme.c
+++ b/net/mac80211/mlme.c
@@ -716,7 +716,7 @@
* 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 @@
} 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 @@
ifmgd->last_probe = jiffies;
ieee80211_send_probe_req(sdata, ifmgd->bssid,
ifmgd->ssid,
- ifmgd->ssid_len);
+ ifmgd->ssid_len,
+ NULL, 0);
}
}
}
diff --git a/net/mac80211/scan.c b/net/mac80211/scan.c
index 08a1fc2..c063f82 100644
--- a/net/mac80211/scan.c
+++ b/net/mac80211/scan.c
@@ -338,7 +338,8 @@
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;
}
diff --git a/net/mac80211/util.c b/net/mac80211/util.c
index dee17e5..e0431a1 100644
--- a/net/mac80211/util.c
+++ b/net/mac80211/util.c
@@ -884,7 +884,8 @@
}
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 @@
}
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 @@
*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);
diff --git a/net/wireless/nl80211.c b/net/wireless/nl80211.c
index 298a4de..67b18b3 100644
--- a/net/wireless/nl80211.c
+++ b/net/wireless/nl80211.c
@@ -2286,6 +2286,7 @@
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 @@
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 @@
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 @@
}
}
+ 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;