hostapd: backport the STBC fix from r22854

git-svn-id: svn://svn.openwrt.org/openwrt/branches/backfire@22855 3c298f89-4303-0410-b956-a3cf2f4a3e73

diff --git a/package/hostapd/patches/420-stbc_fix_backport.patch b/package/hostapd/patches/420-stbc_fix_backport.patch
new file mode 100644 (file)
index 0000000..e448a01
--- /dev/null
+++ b/package/hostapd/patches/420-stbc_fix_backport.patch
@@ -0,0 +1,41 @@
+From: Helmut Schaa <helmut.schaa@googlemail.com>
+Date: Sat, 28 Aug 2010 09:25:44 +0000 (+0300)
+Subject: hostapd: enable STBC only for STBC capable STAs
+X-Git-Url: http://hostap.epitest.fi/gitweb/gitweb.cgi?p=hostap.git;a=commitdiff_plain;h=36af1c7d31bdc5ba4dacacbf32d3c7585665ae2b
+
+hostapd: enable STBC only for STBC capable STAs
+
+hostapd simply used its own STBC configuration in the STA's HT caps. This
+resulted in TX STBC being used for STAs not supporting RX STBC, which in
+turn resulted in the STA not receiving anything.
+
+Fix this by handling the STBC flags in the same way mac80211 does. Mask
+out RX STBC if we don't support TX STBC and vice versa.
+
+Tested only with the nl80211 driver and a STBC incapable STA.
+
+Signed-off-by: Helmut Schaa <helmut.schaa@googlemail.com>
+---
+
+diff --git a/src/ap/ieee802_11_ht.c b/src/ap/ieee802_11_ht.c
+index 1b39a6a..b193ee0 100644
+--- a/src/ap/ieee802_11_ht.c
++++ b/src/ap/ieee802_11_ht.c
+@@ -256,7 +256,15 @@ void hostapd_get_ht_capab(struct hostapd_data *hapd,
+       cap &= hapd->iconf->ht_capab;
+       cap |= (hapd->iconf->ht_capab & HT_CAP_INFO_SMPS_DISABLED);
+ 
+-      /* FIXME: Rx STBC needs to be handled specially */
+-      cap |= (hapd->iconf->ht_capab & HT_CAP_INFO_RX_STBC_MASK);
++      /*
++       * STBC needs to be handled specially
++       * if we don't support RX STBC, mask out TX STBC in the STA's HT caps
++       * if we don't support TX STBC, mask out RX STBC in the STA's HT caps
++       */
++      if (!(hapd->iconf->ht_capab & HT_CAP_INFO_RX_STBC_MASK))
++              cap &= ~HT_CAP_INFO_TX_STBC;
++      if (!(hapd->iconf->ht_capab & HT_CAP_INFO_TX_STBC))
++              cap &= ~HT_CAP_INFO_RX_STBC_MASK;
++
+       neg_ht_cap->ht_capabilities_info = host_to_le16(cap);
+ }