mac80211: assign VLAN channel contexts

Make AP_VLAN type interfaces track the AP master channel
context so they have one assigned for the various lookups.
Don't give them their own refcount etc. since they're just
slaves to the AP master.

Signed-off-by: Johannes Berg <johannes.berg@intel.com>

1 files changed, 38 insertions, 0 deletions

diff --git a/net/mac80211/chan.c b/net/mac80211/chan.c
index 53f03120db5..80e55527504 100644
--- a/net/mac80211/chan.c
+++ b/net/mac80211/chan.c
@@ -4,6 +4,7 @@
 
 #include <linux/nl80211.h>
 #include <linux/export.h>
+#include <linux/rtnetlink.h>
 #include <net/cfg80211.h>
 #include "ieee80211_i.h"
 #include "driver-ops.h"
@@ -197,6 +198,15 @@ static void __ieee80211_vif_release_channel(struct ieee80211_sub_if_data *sdata)
 
         ctx = container_of(conf, struct ieee80211_chanctx, conf);
 
+        if (sdata->vif.type == NL80211_IFTYPE_AP) {
+                struct ieee80211_sub_if_data *vlan;
+
+                /* for the VLAN list */
+                ASSERT_RTNL();
+                list_for_each_entry(vlan, &sdata->u.ap.vlans, u.vlan.list)
+                        rcu_assign_pointer(vlan->vif.chanctx_conf, NULL);
+        }
+
         ieee80211_unassign_vif_chanctx(sdata, ctx);
         if (ctx->refcount == 0)
                 ieee80211_free_chanctx(local, ctx);
@@ -316,6 +326,15 @@ int ieee80211_vif_use_channel(struct ieee80211_sub_if_data *sdata,
                 goto out;
         }
 
+        if (sdata->vif.type == NL80211_IFTYPE_AP) {
+                struct ieee80211_sub_if_data *vlan;
+
+                /* for the VLAN list */
+                ASSERT_RTNL();
+                list_for_each_entry(vlan, &sdata->u.ap.vlans, u.vlan.list)
+                        rcu_assign_pointer(vlan->vif.chanctx_conf, &ctx->conf);
+        }
+
         ieee80211_recalc_smps_chanctx(local, ctx);
  out:
         mutex_unlock(&local->chanctx_mtx);
@@ -331,6 +350,25 @@ void ieee80211_vif_release_channel(struct ieee80211_sub_if_data *sdata)
         mutex_unlock(&sdata->local->chanctx_mtx);
 }
 
+void ieee80211_vif_vlan_copy_chanctx(struct ieee80211_sub_if_data *sdata)
+{
+        struct ieee80211_local *local = sdata->local;
+        struct ieee80211_sub_if_data *ap;
+        struct ieee80211_chanctx_conf *conf;
+
+        if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_AP_VLAN || !sdata->bss))
+                return;
+
+        ap = container_of(sdata->bss, struct ieee80211_sub_if_data, u.ap);
+
+        mutex_lock(&local->chanctx_mtx);
+
+        conf = rcu_dereference_protected(ap->vif.chanctx_conf,
+                                         lockdep_is_held(&local->chanctx_mtx));
+        rcu_assign_pointer(sdata->vif.chanctx_conf, conf);
+        mutex_unlock(&local->chanctx_mtx);
+}
+
 void ieee80211_iter_chan_contexts_atomic(
         struct ieee80211_hw *hw,
         void (*iter)(struct ieee80211_hw *hw,