From 90703ba9bbc904c17828b84dd59b624bc9aef6cb Mon Sep 17 00:00:00 2001 From: Johannes Berg Date: Fri, 2 Sep 2022 16:12:58 +0200 Subject: [PATCH] wifi: mac80211: prevent 4-addr use on MLDs We haven't tried this yet, and it's not very likely to work well right now, so for now disable 4-addr use on interfaces that are MLDs. Signed-off-by: Johannes Berg Link: https://lore.kernel.org/r/20220902161143.f2e4cc2efaa1.I5924e8fb44a2d098b676f5711b36bbc1b1bd68e2@changeid Signed-off-by: Johannes Berg --- net/mac80211/cfg.c | 7 +++++++ net/mac80211/mlme.c | 4 ++++ 2 files changed, 11 insertions(+) diff --git a/net/mac80211/cfg.c b/net/mac80211/cfg.c index b5522edbe05d..687b4c878d4a 100644 --- a/net/mac80211/cfg.c +++ b/net/mac80211/cfg.c @@ -226,6 +226,10 @@ static int ieee80211_change_iface(struct wiphy *wiphy, if (params->use_4addr == ifmgd->use_4addr) return 0; + /* FIXME: no support for 4-addr MLO yet */ + if (sdata->vif.valid_links) + return -EOPNOTSUPP; + sdata->u.mgd.use_4addr = params->use_4addr; if (!ifmgd->associated) return 0; @@ -4697,6 +4701,9 @@ static int ieee80211_add_intf_link(struct wiphy *wiphy, { struct ieee80211_sub_if_data *sdata = IEEE80211_WDEV_TO_SUB_IF(wdev); + if (wdev->use_4addr) + return -EOPNOTSUPP; + return ieee80211_vif_set_links(sdata, wdev->valid_links); } diff --git a/net/mac80211/mlme.c b/net/mac80211/mlme.c index 00d0c433fa2b..05a889c6b375 100644 --- a/net/mac80211/mlme.c +++ b/net/mac80211/mlme.c @@ -6894,6 +6894,10 @@ int ieee80211_mgd_assoc(struct ieee80211_sub_if_data *sdata, } } + /* FIXME: no support for 4-addr MLO yet */ + if (sdata->u.mgd.use_4addr && req->link_id >= 0) + return -EOPNOTSUPP; + assoc_data = kzalloc(size, GFP_KERNEL); if (!assoc_data) return -ENOMEM; -- 2.34.1