5fe231e873
Virtually all code paths in cfg80211 already (need to) hold the RTNL. As such, there's little point in having another four mutexes for various parts of the code, they just cause lock ordering issues (and much of the time, the RTNL and a few of the others need thus be held.) Simplify all this by getting rid of the extra four mutexes and just use the RTNL throughout. Only a few code changes were needed to do this and we can get rid of a work struct for bonus points. Signed-off-by: Johannes Berg <johannes.berg@intel.com>
415 lines
9.4 KiB
C
415 lines
9.4 KiB
C
/*
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* cfg80211 wext compat for managed mode.
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*
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* Copyright 2009 Johannes Berg <johannes@sipsolutions.net>
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* Copyright (C) 2009 Intel Corporation. All rights reserved.
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*/
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#include <linux/export.h>
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#include <linux/etherdevice.h>
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#include <linux/if_arp.h>
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#include <linux/slab.h>
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#include <net/cfg80211.h>
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#include <net/cfg80211-wext.h>
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#include "wext-compat.h"
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#include "nl80211.h"
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int cfg80211_mgd_wext_connect(struct cfg80211_registered_device *rdev,
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struct wireless_dev *wdev)
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{
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struct cfg80211_cached_keys *ck = NULL;
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const u8 *prev_bssid = NULL;
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int err, i;
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ASSERT_RDEV_LOCK(rdev);
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ASSERT_WDEV_LOCK(wdev);
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if (!netif_running(wdev->netdev))
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return 0;
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wdev->wext.connect.ie = wdev->wext.ie;
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wdev->wext.connect.ie_len = wdev->wext.ie_len;
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/* Use default background scan period */
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wdev->wext.connect.bg_scan_period = -1;
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if (wdev->wext.keys) {
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wdev->wext.keys->def = wdev->wext.default_key;
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wdev->wext.keys->defmgmt = wdev->wext.default_mgmt_key;
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if (wdev->wext.default_key != -1)
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wdev->wext.connect.privacy = true;
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}
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if (!wdev->wext.connect.ssid_len)
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return 0;
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if (wdev->wext.keys) {
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ck = kmemdup(wdev->wext.keys, sizeof(*ck), GFP_KERNEL);
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if (!ck)
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return -ENOMEM;
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for (i = 0; i < 6; i++)
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ck->params[i].key = ck->data[i];
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}
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if (wdev->wext.prev_bssid_valid)
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prev_bssid = wdev->wext.prev_bssid;
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err = __cfg80211_connect(rdev, wdev->netdev,
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&wdev->wext.connect, ck, prev_bssid);
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if (err)
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kfree(ck);
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return err;
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}
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int cfg80211_mgd_wext_siwfreq(struct net_device *dev,
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struct iw_request_info *info,
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struct iw_freq *wextfreq, char *extra)
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{
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struct wireless_dev *wdev = dev->ieee80211_ptr;
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struct cfg80211_registered_device *rdev = wiphy_to_dev(wdev->wiphy);
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struct ieee80211_channel *chan = NULL;
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int err, freq;
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/* call only for station! */
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if (WARN_ON(wdev->iftype != NL80211_IFTYPE_STATION))
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return -EINVAL;
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freq = cfg80211_wext_freq(wdev->wiphy, wextfreq);
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if (freq < 0)
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return freq;
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if (freq) {
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chan = ieee80211_get_channel(wdev->wiphy, freq);
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if (!chan)
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return -EINVAL;
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if (chan->flags & IEEE80211_CHAN_DISABLED)
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return -EINVAL;
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}
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wdev_lock(wdev);
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if (wdev->sme_state != CFG80211_SME_IDLE) {
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bool event = true;
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if (wdev->wext.connect.channel == chan) {
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err = 0;
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goto out;
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}
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/* if SSID set, we'll try right again, avoid event */
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if (wdev->wext.connect.ssid_len)
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event = false;
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err = __cfg80211_disconnect(rdev, dev,
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WLAN_REASON_DEAUTH_LEAVING, event);
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if (err)
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goto out;
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}
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wdev->wext.connect.channel = chan;
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/*
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* SSID is not set, we just want to switch monitor channel,
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* this is really just backward compatibility, if the SSID
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* is set then we use the channel to select the BSS to use
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* to connect to instead. If we were connected on another
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* channel we disconnected above and reconnect below.
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*/
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if (chan && !wdev->wext.connect.ssid_len) {
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struct cfg80211_chan_def chandef = {
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.width = NL80211_CHAN_WIDTH_20_NOHT,
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.center_freq1 = freq,
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};
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chandef.chan = ieee80211_get_channel(&rdev->wiphy, freq);
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if (chandef.chan)
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err = cfg80211_set_monitor_channel(rdev, &chandef);
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else
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err = -EINVAL;
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goto out;
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}
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err = cfg80211_mgd_wext_connect(rdev, wdev);
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out:
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wdev_unlock(wdev);
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return err;
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}
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int cfg80211_mgd_wext_giwfreq(struct net_device *dev,
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struct iw_request_info *info,
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struct iw_freq *freq, char *extra)
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{
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struct wireless_dev *wdev = dev->ieee80211_ptr;
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struct ieee80211_channel *chan = NULL;
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/* call only for station! */
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if (WARN_ON(wdev->iftype != NL80211_IFTYPE_STATION))
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return -EINVAL;
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wdev_lock(wdev);
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if (wdev->current_bss)
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chan = wdev->current_bss->pub.channel;
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else if (wdev->wext.connect.channel)
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chan = wdev->wext.connect.channel;
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wdev_unlock(wdev);
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if (chan) {
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freq->m = chan->center_freq;
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freq->e = 6;
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return 0;
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}
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/* no channel if not joining */
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return -EINVAL;
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}
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int cfg80211_mgd_wext_siwessid(struct net_device *dev,
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struct iw_request_info *info,
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struct iw_point *data, char *ssid)
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{
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struct wireless_dev *wdev = dev->ieee80211_ptr;
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struct cfg80211_registered_device *rdev = wiphy_to_dev(wdev->wiphy);
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size_t len = data->length;
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int err;
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/* call only for station! */
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if (WARN_ON(wdev->iftype != NL80211_IFTYPE_STATION))
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return -EINVAL;
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if (!data->flags)
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len = 0;
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/* iwconfig uses nul termination in SSID.. */
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if (len > 0 && ssid[len - 1] == '\0')
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len--;
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wdev_lock(wdev);
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err = 0;
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if (wdev->sme_state != CFG80211_SME_IDLE) {
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bool event = true;
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if (wdev->wext.connect.ssid && len &&
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len == wdev->wext.connect.ssid_len &&
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memcmp(wdev->wext.connect.ssid, ssid, len) == 0)
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goto out;
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/* if SSID set now, we'll try to connect, avoid event */
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if (len)
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event = false;
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err = __cfg80211_disconnect(rdev, dev,
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WLAN_REASON_DEAUTH_LEAVING, event);
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if (err)
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goto out;
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}
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wdev->wext.prev_bssid_valid = false;
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wdev->wext.connect.ssid = wdev->wext.ssid;
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memcpy(wdev->wext.ssid, ssid, len);
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wdev->wext.connect.ssid_len = len;
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wdev->wext.connect.crypto.control_port = false;
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wdev->wext.connect.crypto.control_port_ethertype =
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cpu_to_be16(ETH_P_PAE);
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err = cfg80211_mgd_wext_connect(rdev, wdev);
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out:
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wdev_unlock(wdev);
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return err;
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}
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int cfg80211_mgd_wext_giwessid(struct net_device *dev,
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struct iw_request_info *info,
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struct iw_point *data, char *ssid)
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{
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struct wireless_dev *wdev = dev->ieee80211_ptr;
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/* call only for station! */
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if (WARN_ON(wdev->iftype != NL80211_IFTYPE_STATION))
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return -EINVAL;
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data->flags = 0;
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wdev_lock(wdev);
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if (wdev->current_bss) {
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const u8 *ie;
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rcu_read_lock();
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ie = ieee80211_bss_get_ie(&wdev->current_bss->pub,
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WLAN_EID_SSID);
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if (ie) {
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data->flags = 1;
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data->length = ie[1];
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memcpy(ssid, ie + 2, data->length);
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}
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rcu_read_unlock();
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} else if (wdev->wext.connect.ssid && wdev->wext.connect.ssid_len) {
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data->flags = 1;
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data->length = wdev->wext.connect.ssid_len;
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memcpy(ssid, wdev->wext.connect.ssid, data->length);
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}
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wdev_unlock(wdev);
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return 0;
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}
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int cfg80211_mgd_wext_siwap(struct net_device *dev,
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struct iw_request_info *info,
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struct sockaddr *ap_addr, char *extra)
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{
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struct wireless_dev *wdev = dev->ieee80211_ptr;
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struct cfg80211_registered_device *rdev = wiphy_to_dev(wdev->wiphy);
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u8 *bssid = ap_addr->sa_data;
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int err;
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/* call only for station! */
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if (WARN_ON(wdev->iftype != NL80211_IFTYPE_STATION))
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return -EINVAL;
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if (ap_addr->sa_family != ARPHRD_ETHER)
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return -EINVAL;
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/* automatic mode */
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if (is_zero_ether_addr(bssid) || is_broadcast_ether_addr(bssid))
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bssid = NULL;
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wdev_lock(wdev);
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if (wdev->sme_state != CFG80211_SME_IDLE) {
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err = 0;
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/* both automatic */
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if (!bssid && !wdev->wext.connect.bssid)
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goto out;
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/* fixed already - and no change */
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if (wdev->wext.connect.bssid && bssid &&
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ether_addr_equal(bssid, wdev->wext.connect.bssid))
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goto out;
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err = __cfg80211_disconnect(rdev, dev,
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WLAN_REASON_DEAUTH_LEAVING, false);
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if (err)
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goto out;
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}
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if (bssid) {
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memcpy(wdev->wext.bssid, bssid, ETH_ALEN);
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wdev->wext.connect.bssid = wdev->wext.bssid;
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} else
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wdev->wext.connect.bssid = NULL;
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err = cfg80211_mgd_wext_connect(rdev, wdev);
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out:
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wdev_unlock(wdev);
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return err;
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}
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int cfg80211_mgd_wext_giwap(struct net_device *dev,
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struct iw_request_info *info,
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struct sockaddr *ap_addr, char *extra)
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{
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struct wireless_dev *wdev = dev->ieee80211_ptr;
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/* call only for station! */
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if (WARN_ON(wdev->iftype != NL80211_IFTYPE_STATION))
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return -EINVAL;
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ap_addr->sa_family = ARPHRD_ETHER;
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wdev_lock(wdev);
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if (wdev->current_bss)
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memcpy(ap_addr->sa_data, wdev->current_bss->pub.bssid, ETH_ALEN);
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else
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memset(ap_addr->sa_data, 0, ETH_ALEN);
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wdev_unlock(wdev);
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return 0;
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}
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int cfg80211_wext_siwgenie(struct net_device *dev,
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struct iw_request_info *info,
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struct iw_point *data, char *extra)
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{
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struct wireless_dev *wdev = dev->ieee80211_ptr;
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struct cfg80211_registered_device *rdev = wiphy_to_dev(wdev->wiphy);
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u8 *ie = extra;
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int ie_len = data->length, err;
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if (wdev->iftype != NL80211_IFTYPE_STATION)
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return -EOPNOTSUPP;
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if (!ie_len)
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ie = NULL;
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wdev_lock(wdev);
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/* no change */
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err = 0;
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if (wdev->wext.ie_len == ie_len &&
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memcmp(wdev->wext.ie, ie, ie_len) == 0)
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goto out;
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if (ie_len) {
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ie = kmemdup(extra, ie_len, GFP_KERNEL);
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if (!ie) {
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err = -ENOMEM;
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goto out;
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}
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} else
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ie = NULL;
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kfree(wdev->wext.ie);
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wdev->wext.ie = ie;
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wdev->wext.ie_len = ie_len;
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if (wdev->sme_state != CFG80211_SME_IDLE) {
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err = __cfg80211_disconnect(rdev, dev,
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WLAN_REASON_DEAUTH_LEAVING, false);
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if (err)
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goto out;
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}
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/* userspace better not think we'll reconnect */
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err = 0;
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out:
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wdev_unlock(wdev);
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return err;
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}
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int cfg80211_wext_siwmlme(struct net_device *dev,
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struct iw_request_info *info,
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struct iw_point *data, char *extra)
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{
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struct wireless_dev *wdev = dev->ieee80211_ptr;
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struct iw_mlme *mlme = (struct iw_mlme *)extra;
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struct cfg80211_registered_device *rdev;
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int err;
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if (!wdev)
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return -EOPNOTSUPP;
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rdev = wiphy_to_dev(wdev->wiphy);
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if (wdev->iftype != NL80211_IFTYPE_STATION)
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return -EINVAL;
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if (mlme->addr.sa_family != ARPHRD_ETHER)
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return -EINVAL;
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wdev_lock(wdev);
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switch (mlme->cmd) {
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case IW_MLME_DEAUTH:
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case IW_MLME_DISASSOC:
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err = __cfg80211_disconnect(rdev, dev, mlme->reason_code,
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true);
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break;
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default:
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err = -EOPNOTSUPP;
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break;
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}
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wdev_unlock(wdev);
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return err;
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}
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