nl80211: Optional IEs into scan request
Jouni Malinen [Mon, 16 Feb 2009 17:39:13 +0000 (19:39 +0200)]
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>

include/net/cfg80211.h
net/mac80211/ieee80211_i.h
net/mac80211/mlme.c
net/mac80211/scan.c
net/mac80211/util.c
net/wireless/nl80211.c

index c0d1f5b..33f43b0 100644 (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;
index 27d5641..d06c757 100644 (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,
index ec5a090..5a49779 100644 (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);
                        }
                }
        }
index 08a1fc2..c063f82 100644 (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;
        }
index dee17e5..e0431a1 100644 (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);
index 298a4de..67b18b3 100644 (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;