cfg80211: managed mode wext compatibility

This adds code to make it possible to use the cfg80211
connect() API with wireless extensions, and because the
previous patch added emulation of that API with auth()
and assoc(), by extension also supports wext on that.
At the same time, removes code from mac80211 for wext,
but doesn't yet clean up mac80211's mlme code more.

Signed-off-by: Samuel Ortiz <samuel.ortiz@intel.com>
Signed-off-by: Johannes Berg <johannes@sipsolutions.net>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

1 files changed, 329 insertions, 0 deletions

diff --git a/net/wireless/wext-sme.c b/net/wireless/wext-sme.c
new file mode 100644
index 000000000000..3b531d572b69
--- /dev/null
+++ b/net/wireless/wext-sme.c
@@ -0,0 +1,329 @@
+/*
+ * cfg80211 wext compat for managed mode.
+ *
+ * Copyright 2009	Johannes Berg <johannes@sipsolutions.net>
+ * Copyright (C) 2009   Intel Corporation. All rights reserved.
+ */
+
+#include <linux/etherdevice.h>
+#include <linux/if_arp.h>
+#include <net/cfg80211.h>
+#include "nl80211.h"
+
+static int cfg80211_mgd_wext_connect(struct cfg80211_registered_device *rdev,
+				     struct wireless_dev *wdev)
+{
+	int err;
+
+	if (!netif_running(wdev->netdev))
+		return 0;
+
+	wdev->wext.connect.ie = wdev->wext.ie;
+	wdev->wext.connect.ie_len = wdev->wext.ie_len;
+	wdev->wext.connect.privacy = wdev->wext.default_key != -1;
+
+	err = 0;
+	if (wdev->wext.connect.ssid_len != 0)
+		err = cfg80211_connect(rdev, wdev->netdev,
+					&wdev->wext.connect);
+
+	return err;
+}
+
+int cfg80211_mgd_wext_siwfreq(struct net_device *dev,
+			      struct iw_request_info *info,
+			      struct iw_freq *freq, char *extra)
+{
+	struct wireless_dev *wdev = dev->ieee80211_ptr;
+	struct cfg80211_registered_device *rdev = wiphy_to_dev(wdev->wiphy);
+	struct ieee80211_channel *chan;
+	int err;
+
+	/* call only for station! */
+	if (WARN_ON(wdev->iftype != NL80211_IFTYPE_STATION))
+		return -EINVAL;
+
+	chan = cfg80211_wext_freq(wdev->wiphy, freq);
+	if (chan && IS_ERR(chan))
+		return PTR_ERR(chan);
+
+	if (chan && (chan->flags & IEEE80211_CHAN_DISABLED))
+		return -EINVAL;
+
+	if (wdev->wext.connect.channel == chan)
+		return 0;
+
+	if (wdev->sme_state != CFG80211_SME_IDLE) {
+		bool event = true;
+		/* if SSID set, we'll try right again, avoid event */
+		if (wdev->wext.connect.ssid_len)
+			event = false;
+		err = cfg80211_disconnect(wiphy_to_dev(wdev->wiphy),
+					  dev, WLAN_REASON_DEAUTH_LEAVING,
+					  event);
+		if (err)
+			return err;
+	}
+
+	wdev->wext.connect.channel = chan;
+
+	/* SSID is not set, we just want to switch channel */
+	if (wdev->wext.connect.ssid_len && chan) {
+		if (!rdev->ops->set_channel)
+			return -EOPNOTSUPP;
+
+		return rdev->ops->set_channel(wdev->wiphy, chan,
+					      NL80211_CHAN_NO_HT);
+	}
+
+	return cfg80211_mgd_wext_connect(wiphy_to_dev(wdev->wiphy), wdev);
+}
+/* temporary symbol - mark GPL - in the future the handler won't be */
+EXPORT_SYMBOL_GPL(cfg80211_mgd_wext_siwfreq);
+
+int cfg80211_mgd_wext_giwfreq(struct net_device *dev,
+			      struct iw_request_info *info,
+			      struct iw_freq *freq, char *extra)
+{
+	struct wireless_dev *wdev = dev->ieee80211_ptr;
+	struct ieee80211_channel *chan = NULL;
+
+	/* call only for station! */
+	if (WARN_ON(wdev->iftype != NL80211_IFTYPE_STATION))
+		return -EINVAL;
+
+	if (wdev->current_bss)
+		chan = wdev->current_bss->channel;
+	else if (wdev->wext.connect.channel)
+		chan = wdev->wext.connect.channel;
+
+	if (chan) {
+		freq->m = chan->center_freq;
+		freq->e = 6;
+		return 0;
+	}
+
+	/* no channel if not joining */
+	return -EINVAL;
+}
+/* temporary symbol - mark GPL - in the future the handler won't be */
+EXPORT_SYMBOL_GPL(cfg80211_mgd_wext_giwfreq);
+
+int cfg80211_mgd_wext_siwessid(struct net_device *dev,
+			       struct iw_request_info *info,
+			       struct iw_point *data, char *ssid)
+{
+	struct wireless_dev *wdev = dev->ieee80211_ptr;
+	size_t len = data->length;
+	int err;
+
+	/* call only for station! */
+	if (WARN_ON(wdev->iftype != NL80211_IFTYPE_STATION))
+		return -EINVAL;
+
+	if (!data->flags)
+		len = 0;
+
+	/* iwconfig uses nul termination in SSID.. */
+	if (len > 0 && ssid[len - 1] == '\0')
+		len--;
+
+	if (wdev->wext.connect.ssid && len &&
+	    len == wdev->wext.connect.ssid_len &&
+	    memcmp(wdev->wext.connect.ssid, ssid, len))
+		return 0;
+
+	if (wdev->sme_state != CFG80211_SME_IDLE) {
+		bool event = true;
+		/* if SSID set now, we'll try to connect, avoid event */
+		if (len)
+			event = false;
+		err = cfg80211_disconnect(wiphy_to_dev(wdev->wiphy),
+					  dev, WLAN_REASON_DEAUTH_LEAVING,
+					  event);
+		if (err)
+			return err;
+	}
+
+	wdev->wext.connect.ssid = wdev->wext.ssid;
+	memcpy(wdev->wext.ssid, ssid, len);
+	wdev->wext.connect.ssid_len = len;
+
+	wdev->wext.connect.crypto.control_port = false;
+
+	return cfg80211_mgd_wext_connect(wiphy_to_dev(wdev->wiphy), wdev);
+}
+/* temporary symbol - mark GPL - in the future the handler won't be */
+EXPORT_SYMBOL_GPL(cfg80211_mgd_wext_siwessid);
+
+int cfg80211_mgd_wext_giwessid(struct net_device *dev,
+			       struct iw_request_info *info,
+			       struct iw_point *data, char *ssid)
+{
+	struct wireless_dev *wdev = dev->ieee80211_ptr;
+
+	/* call only for station! */
+	if (WARN_ON(wdev->iftype != NL80211_IFTYPE_STATION))
+		return -EINVAL;
+
+	data->flags = 0;
+
+	if (wdev->ssid_len) {
+		data->flags = 1;
+		data->length = wdev->ssid_len;
+		memcpy(ssid, wdev->ssid, data->length);
+	} else if (wdev->wext.connect.ssid && wdev->wext.connect.ssid_len) {
+		data->flags = 1;
+		data->length = wdev->wext.connect.ssid_len;
+		memcpy(ssid, wdev->wext.connect.ssid, data->length);
+	} else
+		data->flags = 0;
+
+	return 0;
+}
+/* temporary symbol - mark GPL - in the future the handler won't be */
+EXPORT_SYMBOL_GPL(cfg80211_mgd_wext_giwessid);
+
+int cfg80211_mgd_wext_siwap(struct net_device *dev,
+			    struct iw_request_info *info,
+			    struct sockaddr *ap_addr, char *extra)
+{
+	struct wireless_dev *wdev = dev->ieee80211_ptr;
+	u8 *bssid = ap_addr->sa_data;
+	int err;
+
+	/* call only for station! */
+	if (WARN_ON(wdev->iftype != NL80211_IFTYPE_STATION))
+		return -EINVAL;
+
+	if (ap_addr->sa_family != ARPHRD_ETHER)
+		return -EINVAL;
+
+	/* automatic mode */
+	if (is_zero_ether_addr(bssid) || is_broadcast_ether_addr(bssid))
+		bssid = NULL;
+
+	/* both automatic */
+	if (!bssid && !wdev->wext.connect.bssid)
+		return 0;
+
+	/* fixed already - and no change */
+	if (wdev->wext.connect.bssid && bssid &&
+	    compare_ether_addr(bssid, wdev->wext.connect.bssid) == 0)
+		return 0;
+
+	if (wdev->sme_state != CFG80211_SME_IDLE) {
+		err = cfg80211_disconnect(wiphy_to_dev(wdev->wiphy),
+					  dev, WLAN_REASON_DEAUTH_LEAVING,
+					  false);
+		if (err)
+			return err;
+	}
+
+	if (bssid) {
+		memcpy(wdev->wext.bssid, bssid, ETH_ALEN);
+		wdev->wext.connect.bssid = wdev->wext.bssid;
+	} else
+		wdev->wext.connect.bssid = NULL;
+
+	return cfg80211_mgd_wext_connect(wiphy_to_dev(wdev->wiphy), wdev);
+}
+/* temporary symbol - mark GPL - in the future the handler won't be */
+EXPORT_SYMBOL_GPL(cfg80211_mgd_wext_siwap);
+
+int cfg80211_mgd_wext_giwap(struct net_device *dev,
+			    struct iw_request_info *info,
+			    struct sockaddr *ap_addr, char *extra)
+{
+	struct wireless_dev *wdev = dev->ieee80211_ptr;
+
+	/* call only for station! */
+	if (WARN_ON(wdev->iftype != NL80211_IFTYPE_STATION))
+		return -EINVAL;
+
+	ap_addr->sa_family = ARPHRD_ETHER;
+
+	if (wdev->current_bss)
+		memcpy(ap_addr->sa_data, wdev->current_bss->bssid, ETH_ALEN);
+	else if (wdev->wext.connect.bssid)
+		memcpy(ap_addr->sa_data, wdev->wext.connect.bssid, ETH_ALEN);
+	else
+		memset(ap_addr->sa_data, 0, ETH_ALEN);
+
+	return 0;
+}
+/* temporary symbol - mark GPL - in the future the handler won't be */
+EXPORT_SYMBOL_GPL(cfg80211_mgd_wext_giwap);
+
+int cfg80211_wext_siwgenie(struct net_device *dev,
+			   struct iw_request_info *info,
+			   struct iw_point *data, char *extra)
+{
+	struct wireless_dev *wdev = dev->ieee80211_ptr;
+	struct cfg80211_registered_device *rdev = wiphy_to_dev(wdev->wiphy);
+	u8 *ie = extra;
+	int ie_len = data->length, err;
+
+	if (wdev->iftype != NL80211_IFTYPE_STATION)
+		return -EOPNOTSUPP;
+
+	if (!ie_len)
+		ie = NULL;
+
+	/* no change */
+	if (wdev->wext.ie_len == ie_len &&
+	    memcmp(wdev->wext.ie, ie, ie_len) == 0)
+		return 0;
+
+	if (ie_len) {
+		ie = kmemdup(extra, ie_len, GFP_KERNEL);
+		if (!ie)
+			return -ENOMEM;
+	} else
+		ie = NULL;
+
+	kfree(wdev->wext.ie);
+	wdev->wext.ie = ie;
+	wdev->wext.ie_len = ie_len;
+
+	if (wdev->sme_state != CFG80211_SME_IDLE) {
+		err = cfg80211_disconnect(rdev, dev,
+					  WLAN_REASON_DEAUTH_LEAVING, false);
+		if (err)
+			return err;
+	}
+
+	/* userspace better not think we'll reconnect */
+	return 0;
+}
+EXPORT_SYMBOL_GPL(cfg80211_wext_siwgenie);
+
+int cfg80211_wext_siwmlme(struct net_device *dev,
+			  struct iw_request_info *info,
+			  struct iw_point *data, char *extra)
+{
+	struct wireless_dev *wdev = dev->ieee80211_ptr;
+	struct iw_mlme *mlme = (struct iw_mlme *)extra;
+	struct cfg80211_registered_device *rdev;
+
+	if (!wdev)
+		return -EOPNOTSUPP;
+
+	rdev = wiphy_to_dev(wdev->wiphy);
+
+	if (wdev->iftype != NL80211_IFTYPE_STATION)
+		return -EINVAL;
+
+	if (mlme->addr.sa_family != ARPHRD_ETHER)
+		return -EINVAL;
+
+	switch (mlme->cmd) {
+	case IW_MLME_DEAUTH:
+	case IW_MLME_DISASSOC:
+		return cfg80211_disconnect(rdev, dev, mlme->reason_code,
+					   true);
+	default:
+		return -EOPNOTSUPP;
+	}
+}
+EXPORT_SYMBOL_GPL(cfg80211_wext_siwmlme);