mac80211: track TDLS initiator internally
Infer the TDLS initiator and track it in mac80211 via a STA flag. This
avoids breaking old userspace that doesn't pass it via nl80211 APIs.
The only case where userspace will need to pass the initiator is when the
STA is removed due to unreachability before a teardown packet is sent.
Support for unreachability was only recently added to wpa_supplicant, so
it won't be a problem in practice.
Signed-off-by: Arik Nemtsov <arikx.nemtsov@intel.com>
Reviewed-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
diff --git a/net/mac80211/tdls.c b/net/mac80211/tdls.c
index f718533..b01b310 100644
--- a/net/mac80211/tdls.c
+++ b/net/mac80211/tdls.c
@@ -203,6 +203,7 @@
struct sk_buff *skb = NULL;
bool send_direct;
const u8 *init_addr, *rsp_addr;
+ struct sta_info *sta;
int ret;
skb = dev_alloc_skb(local->hw.extra_tx_headroom +
@@ -245,32 +246,40 @@
if (extra_ies_len)
memcpy(skb_put(skb, extra_ies_len), extra_ies, extra_ies_len);
- /* sanity check for initiator */
+ rcu_read_lock();
+ sta = sta_info_get(sdata, peer);
+
+ /* infer the initiator if we can, to support old userspace */
switch (action_code) {
case WLAN_TDLS_SETUP_REQUEST:
+ if (sta)
+ set_sta_flag(sta, WLAN_STA_TDLS_INITIATOR);
+ /* fall-through */
case WLAN_TDLS_SETUP_CONFIRM:
case WLAN_TDLS_DISCOVERY_REQUEST:
- if (!initiator) {
- ret = -EINVAL;
- goto fail;
- }
+ initiator = true;
break;
case WLAN_TDLS_SETUP_RESPONSE:
+ /*
+ * In some testing scenarios, we send a request and response.
+ * Make the last packet sent take effect for the initiator
+ * value.
+ */
+ if (sta)
+ clear_sta_flag(sta, WLAN_STA_TDLS_INITIATOR);
+ /* fall-through */
case WLAN_PUB_ACTION_TDLS_DISCOVER_RES:
- if (initiator) {
- ret = -EINVAL;
- goto fail;
- }
+ initiator = false;
break;
case WLAN_TDLS_TEARDOWN:
/* any value is ok */
break;
default:
ret = -ENOTSUPP;
- goto fail;
+ break;
}
- if (initiator) {
+ if (initiator || (sta && test_sta_flag(sta, WLAN_STA_TDLS_INITIATOR))) {
init_addr = sdata->vif.addr;
rsp_addr = peer;
} else {
@@ -278,6 +287,10 @@
rsp_addr = sdata->vif.addr;
}
+ rcu_read_unlock();
+ if (ret < 0)
+ goto fail;
+
ieee80211_tdls_add_link_ie(skb, init_addr, rsp_addr,
sdata->u.mgd.bssid);