cfg80211: introduce scan IE limit attribute
This patch introduces a new attribute for a wiphy that tells userspace how long the information elements added to a probe request frame can be at most. It also updates the at76 to advertise that it cannot support that, and, for now until I can fix that, iwlwifi too. Signed-off-by: Johannes Berg <johannes@sipsolutions.net> Signed-off-by: John W. Linville <linville@tuxdriver.com>
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@ -2250,6 +2250,7 @@ static int at76_init_new_device(struct at76_priv *priv,
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/* mac80211 initialisation */
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priv->hw->wiphy->max_scan_ssids = 1;
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priv->hw->wiphy->max_scan_ie_len = 0;
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priv->hw->wiphy->interface_modes = BIT(NL80211_IFTYPE_STATION);
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priv->hw->wiphy->bands[IEEE80211_BAND_2GHZ] = &at76_supported_band;
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priv->hw->flags = IEEE80211_HW_RX_INCLUDES_FCS |
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@ -1306,6 +1306,7 @@ int iwl_setup_mac(struct iwl_priv *priv)
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hw->wiphy->custom_regulatory = true;
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hw->wiphy->max_scan_ssids = 1;
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hw->wiphy->max_scan_ie_len = 0; /* XXX for now */
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/* Default value; 4 EDCA QOS priorities */
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hw->queues = 4;
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@ -390,6 +390,8 @@ enum nl80211_commands {
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*
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* @NL80211_ATTR_MAX_NUM_SCAN_SSIDS: number of SSIDs you can scan with
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* a single scan request, a wiphy attribute.
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* @NL80211_ATTR_MAX_SCAN_IE_LEN: maximum length of information elements
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* that can be added to a scan request
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*
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* @NL80211_ATTR_SCAN_FREQUENCIES: nested attribute with frequencies (in MHz)
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* @NL80211_ATTR_SCAN_SSIDS: nested attribute with SSIDs, leave out for passive
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@ -507,6 +509,8 @@ enum nl80211_attrs {
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NL80211_ATTR_KEY_TYPE,
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NL80211_ATTR_MAX_SCAN_IE_LEN,
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/* add attributes here, update the policy in nl80211.c */
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__NL80211_ATTR_AFTER_LAST,
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@ -222,6 +222,7 @@ struct wiphy {
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int bss_priv_size;
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u8 max_scan_ssids;
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u16 max_scan_ie_len;
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/* If multiple wiphys are registered and you're handed e.g.
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* a regular netdev with assigned ieee80211_ptr, you won't
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@ -728,7 +728,18 @@ struct ieee80211_hw *ieee80211_alloc_hw(size_t priv_data_len,
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return NULL;
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wiphy->privid = mac80211_wiphy_privid;
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wiphy->max_scan_ssids = 4;
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if (!ops->hw_scan) {
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/* For hw_scan, driver needs to set these up. */
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wiphy->max_scan_ssids = 4;
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/* we support a maximum of 32 rates in cfg80211 */
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wiphy->max_scan_ie_len = IEEE80211_MAX_DATA_LEN
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- 2 - 32 /* SSID */
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- 4 - 32 /* (ext) supp rates */;
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}
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/* Yes, putting cfg80211_bss into ieee80211_bss is a hack */
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wiphy->bss_priv_size = sizeof(struct ieee80211_bss) -
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sizeof(struct cfg80211_bss);
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@ -890,6 +890,8 @@ void ieee80211_send_probe_req(struct ieee80211_sub_if_data *sdata, u8 *dst,
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*pos = rate->bitrate / 5;
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}
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/* if adding more here, adjust max_scan_ie_len */
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if (ie)
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memcpy(skb_put(skb, ie_len), ie, ie_len);
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@ -181,6 +181,8 @@ static int nl80211_send_wiphy(struct sk_buff *msg, u32 pid, u32 seq, int flags,
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NLA_PUT_STRING(msg, NL80211_ATTR_WIPHY_NAME, wiphy_name(&dev->wiphy));
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NLA_PUT_U8(msg, NL80211_ATTR_MAX_NUM_SCAN_SSIDS,
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dev->wiphy.max_scan_ssids);
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NLA_PUT_U16(msg, NL80211_ATTR_MAX_SCAN_IE_LEN,
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dev->wiphy.max_scan_ie_len);
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nl_modes = nla_nest_start(msg, NL80211_ATTR_SUPPORTED_IFTYPES);
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if (!nl_modes)
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@ -2528,6 +2530,11 @@ static int nl80211_trigger_scan(struct sk_buff *skb, struct genl_info *info)
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else
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ie_len = 0;
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if (ie_len > wiphy->max_scan_ie_len) {
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err = -EINVAL;
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goto out;
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}
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request = kzalloc(sizeof(*request)
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+ sizeof(*ssid) * n_ssids
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+ sizeof(channel) * n_channels
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