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cfg80211: allow leaving MU-MIMO monitor configuration unchanged

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When changing monitor parameters, not setting the MU-MIMO attributes
should mean that they're not changed - it's documented that to turn
the feature off it's necessary to set all-zero group membership and
an invalid follow-address. This isn't implemented.

Fix this by making the parameters pointers, stop reusing the macaddr
struct member, and documenting that NULL pointers mean unchanged.

Signed-off-by: Johannes Berg <[email protected]>
This commit is contained in:
Johannes Berg 2017-04-12 10:43:49 +02:00
commit b0265024b8
3 changed files with 13 additions and 12 deletions
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10
net/mac80211/cfg.c
View file

@ -80,8 +80,7 @@ static int ieee80211_change_iface(struct wiphy *wiphy,
u32 mu_mntr_cap_flag = NL80211_EXT_FEATURE_MU_MIMO_AIR_SNIFFER;
monitor_sdata = rtnl_dereference(local->monitor_sdata);
if (monitor_sdata &&
wiphy_ext_feature_isset(wiphy, mu_mntr_cap_flag)) {
if (monitor_sdata && params->vht_mumimo_groups) {
memcpy(monitor_sdata->vif.bss_conf.mu_group.membership,
params->vht_mumimo_groups, WLAN_MEMBERSHIP_LEN);
memcpy(monitor_sdata->vif.bss_conf.mu_group.position,
@ -90,11 +89,12 @@ static int ieee80211_change_iface(struct wiphy *wiphy,
monitor_sdata->vif.mu_mimo_owner = true;
ieee80211_bss_info_change_notify(monitor_sdata,
BSS_CHANGED_MU_GROUPS);
ether_addr_copy(monitor_sdata->u.mntr.mu_follow_addr,
params->macaddr);
}
if (monitor_sdata && params->vht_mumimo_follow_addr)
ether_addr_copy(monitor_sdata->u.mntr.mu_follow_addr,
params->vht_mumimo_follow_addr);
if (!flags)
return 0;