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nl80211: add HT/VHT capabilities to AP parameters

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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>
This commit is contained in:
Johannes Berg 2017-02-07 22:40:44 +02:00
parent a4956dca07
commit 66cd794e3c
3 changed files with 56 additions and 2 deletions
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3
include/linux/ieee80211.h
View File

@ -1043,8 +1043,9 @@ struct ieee80211_mgmt {
} u;
} __packed __aligned(2);
/* Supported Rates value encodings in 802.11n-2009 7.3.2.2 */
/* Supported rates membership selectors */
#define BSS_MEMBERSHIP_SELECTOR_HT_PHY 127
#define BSS_MEMBERSHIP_SELECTOR_VHT_PHY 126
/* mgmt header + 1 byte category code */
#define IEEE80211_MIN_ACTION_SIZE offsetof(struct ieee80211_mgmt, u.action.u)

8
include/net/cfg80211.h
View File

@ -748,6 +748,10 @@ struct cfg80211_bitrate_mask {
* @pbss: If set, start as a PCP instead of AP. Relevant for DMG
* networks.
* @beacon_rate: bitrate to be used for beacons
* @ht_cap: HT capabilities (or %NULL if HT isn't enabled)
* @vht_cap: VHT capabilities (or %NULL if VHT isn't enabled)
* @ht_required: stations must support HT
* @vht_required: stations must support VHT
*/
struct cfg80211_ap_settings {
struct cfg80211_chan_def chandef;
@ -768,6 +772,10 @@ struct cfg80211_ap_settings {
const struct cfg80211_acl_data *acl;
bool pbss;
struct cfg80211_bitrate_mask beacon_rate;
const struct ieee80211_ht_cap *ht_cap;
const struct ieee80211_vht_cap *vht_cap;
bool ht_required, vht_required;
};
/**

47
net/wireless/nl80211.c
View File

@ -3,7 +3,7 @@
*
* Copyright 2006-2010 Johannes Berg <johannes@sipsolutions.net>
* Copyright 2013-2014 Intel Mobile Communications GmbH
* Copyright 2015-2016 Intel Deutschland GmbH
* Copyright 2015-2017 Intel Deutschland GmbH
*/
#include <linux/if.h>
@ -3743,6 +3743,49 @@ static int nl80211_parse_beacon(struct nlattr *attrs[],
return 0;
}
static void nl80211_check_ap_rate_selectors(struct cfg80211_ap_settings *params,
const u8 *rates)
{
int i;
if (!rates)
return;
for (i = 0; i < rates[1]; i++) {
if (rates[2 + i] == BSS_MEMBERSHIP_SELECTOR_HT_PHY)
params->ht_required = true;
if (rates[2 + i] == BSS_MEMBERSHIP_SELECTOR_VHT_PHY)
params->vht_required = true;
}
}
/*
* Since the nl80211 API didn't include, from the beginning, attributes about
* HT/VHT requirements/capabilities, we parse them out of the IEs for the
* benefit of drivers that rebuild IEs in the firmware.
*/
static void nl80211_calculate_ap_params(struct cfg80211_ap_settings *params)
{
const struct cfg80211_beacon_data *bcn = &params->beacon;
size_t ies_len = bcn->beacon_ies_len;
const u8 *ies = bcn->beacon_ies;
const u8 *rates;
const u8 *cap;
rates = cfg80211_find_ie(WLAN_EID_SUPP_RATES, ies, ies_len);
nl80211_check_ap_rate_selectors(params, rates);
rates = cfg80211_find_ie(WLAN_EID_EXT_SUPP_RATES, ies, ies_len);
nl80211_check_ap_rate_selectors(params, rates);
cap = cfg80211_find_ie(WLAN_EID_HT_CAPABILITY, ies, ies_len);
if (cap && cap[1] >= sizeof(*params->ht_cap))
params->ht_cap = (void *)(cap + 2);
cap = cfg80211_find_ie(WLAN_EID_VHT_CAPABILITY, ies, ies_len);
if (cap && cap[1] >= sizeof(*params->vht_cap))
params->vht_cap = (void *)(cap + 2);
}
static bool nl80211_get_ap_channel(struct cfg80211_registered_device *rdev,
struct cfg80211_ap_settings *params)
{
@ -3971,6 +4014,8 @@ static int nl80211_start_ap(struct sk_buff *skb, struct genl_info *info)
return PTR_ERR(params.acl);
}
nl80211_calculate_ap_params(&params);
wdev_lock(wdev);
err = rdev_start_ap(rdev, dev, &params);
if (!err) {