Added support for setting BSS parameters with NL80211_CMD_SET_BSS

This new cfg80211 command is used for setting CTS protect, short preamble,
and short slot time parameters for the BSS. The matching kernel change has
been submitted, but is not yet included in wireless-testing. The code here
used #ifdef to avoid compilation failures before the new command is
available.

hostapd/driver_nl80211.c

@@ -1245,21 +1245,63 @@ static int i802_set_dtim_period(const char *iface, void *priv, int value)
 }
 
 
-static int i802_set_cts_protect(void *priv, int value)
+static int i802_set_bss(void *priv, int cts, int preamble, int slot)
 {
+#ifdef NL80211_CMD_SET_BSS
+	struct i802_driver_data *drv = priv;
+	struct nl_msg *msg;
+	int ret = -1;
+
+	msg = nlmsg_alloc();
+	if (!msg)
+		goto out;
+
+	genlmsg_put(msg, 0, 0, genl_family_get_id(drv->nl80211), 0, 0,
+		    NL80211_CMD_SET_BSS, 0);
+
+	if (cts >= 0)
+		NLA_PUT_U8(msg, NL80211_ATTR_BSS_CTS_PROT, cts);
+	if (preamble >= 0)
+		NLA_PUT_U8(msg, NL80211_ATTR_BSS_SHORT_PREAMBLE, preamble);
+	if (slot >= 0)
+		NLA_PUT_U8(msg, NL80211_ATTR_BSS_SHORT_SLOT_TIME, slot);
+
+	ret = 0;
+
+	/* TODO: multi-BSS support */
+	NLA_PUT_U32(msg, NL80211_ATTR_IFINDEX, if_nametoindex(drv->iface));
+
+	if (nl_send_auto_complete(drv->nl_handle, msg) < 0 ||
+	    nl_wait_for_ack(drv->nl_handle) < 0) {
+		ret = -1;
+	}
+
+nla_put_failure:
+	nlmsg_free(msg);
+
+out:
+	return ret;
+#else /* NL80211_CMD_SET_BSS */
 	return -1;
+#endif /* NL80211_CMD_SET_BSS */
+}
+
+
+static int i802_set_cts_protect(void *priv, int value)
+{
+	return i802_set_bss(priv, value, -1, -1);
 }
 
 
 static int i802_set_preamble(void *priv, int value)
 {
-	return -1;
+	return i802_set_bss(priv, -1, value, -1);
 }
 
 
 static int i802_set_short_slot_time(void *priv, int value)
 {
-	return -1;
+	return i802_set_bss(priv, -1, -1, value);
 }