diff options
| author | Arik Nemtsov <arik@wizery.com> | 2011-09-28 14:12:54 +0300 |
|---|---|---|
| committer | John W. Linville <linville@tuxdriver.com> | 2011-09-30 15:57:09 -0400 |
| commit | 941c93cd039852b7ab02c74f4698c99d82bd6cfe (patch) | |
| tree | 8f527535dcb145877ac8cb68f43723b05d574e6e /net/mac80211/tx.c | |
| parent | 07ba55d7f1d0da174c9bc545c713b44cee760197 (diff) | |
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.c | 42 |
1 files changed, 38 insertions, 4 deletions
diff --git a/net/mac80211/tx.c b/net/mac80211/tx.c index 542272acfc1..0ca16880bbb 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; |