nl80211: add HT/VHT capabilities to AP parameters
For the benefit of drivers that rebuild IEs in firmware, parse the IEs for HT/VHT capabilities and the respective membership selector in the (extended) supported rates. This avoids duplicating the same code into all drivers that need this information. Signed-off-by: Johannes Berg <johannes.berg@intel.com>
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@ -1043,8 +1043,9 @@ struct ieee80211_mgmt {
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} u;
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} __packed __aligned(2);
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/* Supported Rates value encodings in 802.11n-2009 7.3.2.2 */
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/* Supported rates membership selectors */
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#define BSS_MEMBERSHIP_SELECTOR_HT_PHY 127
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#define BSS_MEMBERSHIP_SELECTOR_VHT_PHY 126
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/* mgmt header + 1 byte category code */
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#define IEEE80211_MIN_ACTION_SIZE offsetof(struct ieee80211_mgmt, u.action.u)
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@ -748,6 +748,10 @@ struct cfg80211_bitrate_mask {
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* @pbss: If set, start as a PCP instead of AP. Relevant for DMG
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* networks.
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* @beacon_rate: bitrate to be used for beacons
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* @ht_cap: HT capabilities (or %NULL if HT isn't enabled)
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* @vht_cap: VHT capabilities (or %NULL if VHT isn't enabled)
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* @ht_required: stations must support HT
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* @vht_required: stations must support VHT
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*/
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struct cfg80211_ap_settings {
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struct cfg80211_chan_def chandef;
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@ -768,6 +772,10 @@ struct cfg80211_ap_settings {
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const struct cfg80211_acl_data *acl;
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bool pbss;
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struct cfg80211_bitrate_mask beacon_rate;
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const struct ieee80211_ht_cap *ht_cap;
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const struct ieee80211_vht_cap *vht_cap;
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bool ht_required, vht_required;
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};
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/**
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@ -3,7 +3,7 @@
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*
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* Copyright 2006-2010 Johannes Berg <johannes@sipsolutions.net>
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* Copyright 2013-2014 Intel Mobile Communications GmbH
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* Copyright 2015-2016 Intel Deutschland GmbH
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* Copyright 2015-2017 Intel Deutschland GmbH
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*/
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#include <linux/if.h>
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@ -3743,6 +3743,49 @@ static int nl80211_parse_beacon(struct nlattr *attrs[],
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return 0;
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}
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static void nl80211_check_ap_rate_selectors(struct cfg80211_ap_settings *params,
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const u8 *rates)
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{
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int i;
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if (!rates)
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return;
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for (i = 0; i < rates[1]; i++) {
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if (rates[2 + i] == BSS_MEMBERSHIP_SELECTOR_HT_PHY)
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params->ht_required = true;
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if (rates[2 + i] == BSS_MEMBERSHIP_SELECTOR_VHT_PHY)
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params->vht_required = true;
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}
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}
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/*
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* Since the nl80211 API didn't include, from the beginning, attributes about
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* HT/VHT requirements/capabilities, we parse them out of the IEs for the
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* benefit of drivers that rebuild IEs in the firmware.
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*/
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static void nl80211_calculate_ap_params(struct cfg80211_ap_settings *params)
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{
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const struct cfg80211_beacon_data *bcn = ¶ms->beacon;
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size_t ies_len = bcn->beacon_ies_len;
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const u8 *ies = bcn->beacon_ies;
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const u8 *rates;
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const u8 *cap;
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rates = cfg80211_find_ie(WLAN_EID_SUPP_RATES, ies, ies_len);
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nl80211_check_ap_rate_selectors(params, rates);
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rates = cfg80211_find_ie(WLAN_EID_EXT_SUPP_RATES, ies, ies_len);
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nl80211_check_ap_rate_selectors(params, rates);
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cap = cfg80211_find_ie(WLAN_EID_HT_CAPABILITY, ies, ies_len);
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if (cap && cap[1] >= sizeof(*params->ht_cap))
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params->ht_cap = (void *)(cap + 2);
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cap = cfg80211_find_ie(WLAN_EID_VHT_CAPABILITY, ies, ies_len);
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if (cap && cap[1] >= sizeof(*params->vht_cap))
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params->vht_cap = (void *)(cap + 2);
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}
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static bool nl80211_get_ap_channel(struct cfg80211_registered_device *rdev,
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struct cfg80211_ap_settings *params)
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{
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@ -3971,6 +4014,8 @@ static int nl80211_start_ap(struct sk_buff *skb, struct genl_info *info)
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return PTR_ERR(params.acl);
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}
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nl80211_calculate_ap_params(¶ms);
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wdev_lock(wdev);
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err = rdev_start_ap(rdev, dev, ¶ms);
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if (!err) {
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