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authorArik Nemtsov <arik@wizery.com>2011-09-28 14:12:54 +0300
committerJohn W. Linville <linville@tuxdriver.com>2011-09-30 15:57:09 -0400
commit941c93cd039852b7ab02c74f4698c99d82bd6cfe (patch)
tree8f527535dcb145877ac8cb68f43723b05d574e6e /net/mac80211/tx.c
parent07ba55d7f1d0da174c9bc545c713b44cee760197 (diff)
downloadop-kernel-dev-941c93cd039852b7ab02c74f4698c99d82bd6cfe.zip
op-kernel-dev-941c93cd039852b7ab02c74f4698c99d82bd6cfe.tar.gz
mac80211: data path modification for TDLS peers
Mark the STA entries of enabled TDLS peers with a new "peer authorized" flag. During link setup, allow special TDLS setup frames through the AP, but otherwise drop all packets destined to the peer. This is required by the TDLS (802.11z) specification in order to prevent reordering of MSDUs between the AP and direct paths. When setup completes and the peer is authorized, send data directly, bypassing the AP. In the Rx path, allow data to be received directly from TDLS peers. Signed-off-by: Arik Nemtsov <arik@wizery.com> Cc: Kalyan C Gaddam <chakkal@iit.edu> Signed-off-by: John W. Linville <linville@tuxdriver.com>
Diffstat (limited to 'net/mac80211/tx.c')
-rw-r--r--net/mac80211/tx.c42
1 files changed, 38 insertions, 4 deletions
diff --git a/net/mac80211/tx.c b/net/mac80211/tx.c
index 542272a..0ca1688 100644
--- a/net/mac80211/tx.c
+++ b/net/mac80211/tx.c
@@ -1726,6 +1726,7 @@ netdev_tx_t ieee80211_subif_start_xmit(struct sk_buff *skb,
struct sta_info *sta = NULL;
u32 sta_flags = 0;
struct sk_buff *tmp_skb;
+ bool tdls_direct = false;
if (unlikely(skb->len < ETH_HLEN)) {
ret = NETDEV_TX_OK;
@@ -1837,11 +1838,43 @@ netdev_tx_t ieee80211_subif_start_xmit(struct sk_buff *skb,
break;
#endif
case NL80211_IFTYPE_STATION:
- memcpy(hdr.addr1, sdata->u.mgd.bssid, ETH_ALEN);
- if (sdata->u.mgd.use_4addr &&
- cpu_to_be16(ethertype) != sdata->control_port_protocol) {
- fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS);
+ if (sdata->wdev.wiphy->flags & WIPHY_FLAG_SUPPORTS_TDLS) {
+ rcu_read_lock();
+ sta = sta_info_get(sdata, skb->data);
+ if (sta)
+ sta_flags = get_sta_flags(sta);
+ rcu_read_unlock();
+
+ /*
+ * If the TDLS link is enabled, send everything
+ * directly. Otherwise, allow TDLS setup frames
+ * to be transmitted indirectly.
+ */
+ tdls_direct =
+ (sta_flags & WLAN_STA_TDLS_PEER) &&
+ ((sta_flags & WLAN_STA_TDLS_PEER_AUTH) ||
+ !(ethertype == ETH_P_TDLS && skb->len > 14 &&
+ skb->data[14] == WLAN_TDLS_SNAP_RFTYPE));
+ }
+
+ if (tdls_direct) {
+ /* link during setup - throw out frames to peer */
+ if (!(sta_flags & WLAN_STA_TDLS_PEER_AUTH)) {
+ ret = NETDEV_TX_OK;
+ goto fail;
+ }
+
+ /* DA SA BSSID */
+ memcpy(hdr.addr1, skb->data, ETH_ALEN);
+ memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
+ memcpy(hdr.addr3, sdata->u.mgd.bssid, ETH_ALEN);
+ hdrlen = 24;
+ } else if (sdata->u.mgd.use_4addr &&
+ cpu_to_be16(ethertype) != sdata->control_port_protocol) {
+ fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS |
+ IEEE80211_FCTL_TODS);
/* RA TA DA SA */
+ memcpy(hdr.addr1, sdata->u.mgd.bssid, ETH_ALEN);
memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN);
memcpy(hdr.addr3, skb->data, ETH_ALEN);
memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN);
@@ -1849,6 +1882,7 @@ netdev_tx_t ieee80211_subif_start_xmit(struct sk_buff *skb,
} else {
fc |= cpu_to_le16(IEEE80211_FCTL_TODS);
/* BSSID SA DA */
+ memcpy(hdr.addr1, sdata->u.mgd.bssid, ETH_ALEN);
memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
memcpy(hdr.addr3, skb->data, ETH_ALEN);
hdrlen = 24;
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