![Johannes Berg](/assets/img/avatar_default.png)
When a software scan starts, it first sets sw_scanning, but leaves the scan_channel "unset" (it currently actually gets initialised to a default). Now, when something else tries to (re)configure the hardware in the window between these two events (after sw_scanning = true, but before scan_channel is set), the current code switches to the (unset!) scan_channel. This causes trouble, especially when switching bands and sending frames on the wrong channel. To work around this, leave scan_channel initialised to NULL and use it to determine whether or not a switch to a different channel should occur (and also use the same condition to check whether to adjust power for scan or not). Additionally, avoid reconfiguring the hardware completely when recalculating idle resulted in no changes, this was the problem that originally led us to discover the race condition in the first place, which was helpfully bisected by Pavel. This part of the patch should not be necessary with the other fixes, but not calling the ieee80211_hw_config function when we know it to be unnecessary is certainly a correct thing to do. Unfortunately, this patch cannot and does not fix the race condition completely, but due to the way the scan code is structured it makes the particular problem Pavel discovered (race while changing channel at the same time as transmitting frames) go away. To fix it completely, more work especially with locking configuration is needed. Bisected-by: Pavel Roskin <proski@gnu.org> Signed-off-by: Johannes Berg <johannes@sipsolutions.net> Signed-off-by: John W. Linville <linville@tuxdriver.com>
1164 lines
31 KiB
C
1164 lines
31 KiB
C
/*
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* Copyright 2002-2005, Instant802 Networks, Inc.
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* Copyright 2005-2006, Devicescape Software, Inc.
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* Copyright 2006-2007 Jiri Benc <jbenc@suse.cz>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#include <net/mac80211.h>
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#include <net/ieee80211_radiotap.h>
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/netdevice.h>
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#include <linux/types.h>
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#include <linux/slab.h>
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#include <linux/skbuff.h>
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#include <linux/etherdevice.h>
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#include <linux/if_arp.h>
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#include <linux/wireless.h>
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#include <linux/rtnetlink.h>
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#include <linux/bitmap.h>
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#include <linux/pm_qos_params.h>
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#include <net/net_namespace.h>
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#include <net/cfg80211.h>
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#include "ieee80211_i.h"
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#include "driver-ops.h"
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#include "rate.h"
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#include "mesh.h"
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#include "wep.h"
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#include "wme.h"
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#include "aes_ccm.h"
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#include "led.h"
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#include "cfg.h"
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#include "debugfs.h"
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#include "debugfs_netdev.h"
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/*
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* For seeing transmitted packets on monitor interfaces
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* we have a radiotap header too.
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*/
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struct ieee80211_tx_status_rtap_hdr {
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struct ieee80211_radiotap_header hdr;
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u8 rate;
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u8 padding_for_rate;
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__le16 tx_flags;
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u8 data_retries;
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} __attribute__ ((packed));
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/* must be called under mdev tx lock */
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void ieee80211_configure_filter(struct ieee80211_local *local)
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{
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unsigned int changed_flags;
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unsigned int new_flags = 0;
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if (atomic_read(&local->iff_promiscs))
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new_flags |= FIF_PROMISC_IN_BSS;
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if (atomic_read(&local->iff_allmultis))
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new_flags |= FIF_ALLMULTI;
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if (local->monitors)
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new_flags |= FIF_BCN_PRBRESP_PROMISC;
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if (local->fif_fcsfail)
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new_flags |= FIF_FCSFAIL;
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if (local->fif_plcpfail)
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new_flags |= FIF_PLCPFAIL;
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if (local->fif_control)
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new_flags |= FIF_CONTROL;
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if (local->fif_other_bss)
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new_flags |= FIF_OTHER_BSS;
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changed_flags = local->filter_flags ^ new_flags;
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/* be a bit nasty */
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new_flags |= (1<<31);
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drv_configure_filter(local, changed_flags, &new_flags,
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local->mdev->mc_count,
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local->mdev->mc_list);
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WARN_ON(new_flags & (1<<31));
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local->filter_flags = new_flags & ~(1<<31);
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}
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/* master interface */
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static int header_parse_80211(const struct sk_buff *skb, unsigned char *haddr)
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{
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memcpy(haddr, skb_mac_header(skb) + 10, ETH_ALEN); /* addr2 */
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return ETH_ALEN;
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}
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static const struct header_ops ieee80211_header_ops = {
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.create = eth_header,
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.parse = header_parse_80211,
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.rebuild = eth_rebuild_header,
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.cache = eth_header_cache,
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.cache_update = eth_header_cache_update,
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};
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static int ieee80211_master_open(struct net_device *dev)
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{
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struct ieee80211_master_priv *mpriv = netdev_priv(dev);
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struct ieee80211_local *local = mpriv->local;
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struct ieee80211_sub_if_data *sdata;
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int res = -EOPNOTSUPP;
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/* we hold the RTNL here so can safely walk the list */
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list_for_each_entry(sdata, &local->interfaces, list) {
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if (netif_running(sdata->dev)) {
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res = 0;
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break;
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}
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}
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if (res)
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return res;
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netif_tx_start_all_queues(local->mdev);
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return 0;
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}
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static int ieee80211_master_stop(struct net_device *dev)
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{
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struct ieee80211_master_priv *mpriv = netdev_priv(dev);
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struct ieee80211_local *local = mpriv->local;
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struct ieee80211_sub_if_data *sdata;
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/* we hold the RTNL here so can safely walk the list */
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list_for_each_entry(sdata, &local->interfaces, list)
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if (netif_running(sdata->dev))
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dev_close(sdata->dev);
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return 0;
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}
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static void ieee80211_master_set_multicast_list(struct net_device *dev)
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{
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struct ieee80211_master_priv *mpriv = netdev_priv(dev);
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struct ieee80211_local *local = mpriv->local;
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ieee80211_configure_filter(local);
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}
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int ieee80211_hw_config(struct ieee80211_local *local, u32 changed)
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{
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struct ieee80211_channel *chan, *scan_chan;
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int ret = 0;
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int power;
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enum nl80211_channel_type channel_type;
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might_sleep();
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scan_chan = local->scan_channel;
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if (scan_chan) {
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chan = scan_chan;
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channel_type = NL80211_CHAN_NO_HT;
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} else {
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chan = local->oper_channel;
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channel_type = local->oper_channel_type;
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}
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if (chan != local->hw.conf.channel ||
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channel_type != local->hw.conf.channel_type) {
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local->hw.conf.channel = chan;
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local->hw.conf.channel_type = channel_type;
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changed |= IEEE80211_CONF_CHANGE_CHANNEL;
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}
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if (scan_chan)
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power = chan->max_power;
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else
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power = local->power_constr_level ?
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(chan->max_power - local->power_constr_level) :
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chan->max_power;
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if (local->user_power_level >= 0)
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power = min(power, local->user_power_level);
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if (local->hw.conf.power_level != power) {
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changed |= IEEE80211_CONF_CHANGE_POWER;
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local->hw.conf.power_level = power;
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}
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if (changed && local->open_count) {
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ret = drv_config(local, changed);
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/*
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* Goal:
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* HW reconfiguration should never fail, the driver has told
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* us what it can support so it should live up to that promise.
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*
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* Current status:
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* rfkill is not integrated with mac80211 and a
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* configuration command can thus fail if hardware rfkill
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* is enabled
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*
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* FIXME: integrate rfkill with mac80211 and then add this
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* WARN_ON() back
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*
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*/
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/* WARN_ON(ret); */
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}
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return ret;
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}
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void ieee80211_bss_info_change_notify(struct ieee80211_sub_if_data *sdata,
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u32 changed)
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{
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struct ieee80211_local *local = sdata->local;
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if (!changed)
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return;
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if (sdata->vif.type == NL80211_IFTYPE_STATION)
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sdata->vif.bss_conf.bssid = sdata->u.mgd.bssid;
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else if (sdata->vif.type == NL80211_IFTYPE_ADHOC)
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sdata->vif.bss_conf.bssid = sdata->u.ibss.bssid;
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else if (sdata->vif.type == NL80211_IFTYPE_AP)
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sdata->vif.bss_conf.bssid = sdata->dev->dev_addr;
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else if (ieee80211_vif_is_mesh(&sdata->vif)) {
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static const u8 zero[ETH_ALEN] = { 0 };
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sdata->vif.bss_conf.bssid = zero;
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} else {
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WARN_ON(1);
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return;
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}
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switch (sdata->vif.type) {
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case NL80211_IFTYPE_AP:
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case NL80211_IFTYPE_ADHOC:
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case NL80211_IFTYPE_MESH_POINT:
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break;
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default:
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/* do not warn to simplify caller in scan.c */
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changed &= ~BSS_CHANGED_BEACON_ENABLED;
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if (WARN_ON(changed & BSS_CHANGED_BEACON))
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return;
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break;
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}
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if (changed & BSS_CHANGED_BEACON_ENABLED) {
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if (local->sw_scanning) {
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sdata->vif.bss_conf.enable_beacon = false;
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} else {
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/*
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* Beacon should be enabled, but AP mode must
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* check whether there is a beacon configured.
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*/
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switch (sdata->vif.type) {
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case NL80211_IFTYPE_AP:
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sdata->vif.bss_conf.enable_beacon =
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!!rcu_dereference(sdata->u.ap.beacon);
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break;
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case NL80211_IFTYPE_ADHOC:
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sdata->vif.bss_conf.enable_beacon =
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!!rcu_dereference(sdata->u.ibss.presp);
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break;
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case NL80211_IFTYPE_MESH_POINT:
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sdata->vif.bss_conf.enable_beacon = true;
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break;
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default:
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/* not reached */
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WARN_ON(1);
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break;
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}
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}
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}
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drv_bss_info_changed(local, &sdata->vif,
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&sdata->vif.bss_conf, changed);
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/*
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* DEPRECATED
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*
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* ~changed is just there to not do this at resume time
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*/
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if (changed & BSS_CHANGED_BEACON_INT && ~changed) {
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local->hw.conf.beacon_int = sdata->vif.bss_conf.beacon_int;
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ieee80211_hw_config(local,
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_IEEE80211_CONF_CHANGE_BEACON_INTERVAL);
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}
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}
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u32 ieee80211_reset_erp_info(struct ieee80211_sub_if_data *sdata)
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{
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sdata->vif.bss_conf.use_cts_prot = false;
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sdata->vif.bss_conf.use_short_preamble = false;
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sdata->vif.bss_conf.use_short_slot = false;
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return BSS_CHANGED_ERP_CTS_PROT |
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BSS_CHANGED_ERP_PREAMBLE |
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BSS_CHANGED_ERP_SLOT;
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}
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void ieee80211_tx_status_irqsafe(struct ieee80211_hw *hw,
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struct sk_buff *skb)
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{
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struct ieee80211_local *local = hw_to_local(hw);
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struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
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int tmp;
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skb->dev = local->mdev;
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skb->pkt_type = IEEE80211_TX_STATUS_MSG;
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skb_queue_tail(info->flags & IEEE80211_TX_CTL_REQ_TX_STATUS ?
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&local->skb_queue : &local->skb_queue_unreliable, skb);
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tmp = skb_queue_len(&local->skb_queue) +
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skb_queue_len(&local->skb_queue_unreliable);
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while (tmp > IEEE80211_IRQSAFE_QUEUE_LIMIT &&
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(skb = skb_dequeue(&local->skb_queue_unreliable))) {
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dev_kfree_skb_irq(skb);
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tmp--;
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I802_DEBUG_INC(local->tx_status_drop);
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}
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tasklet_schedule(&local->tasklet);
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}
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EXPORT_SYMBOL(ieee80211_tx_status_irqsafe);
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static void ieee80211_tasklet_handler(unsigned long data)
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{
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struct ieee80211_local *local = (struct ieee80211_local *) data;
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struct sk_buff *skb;
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struct ieee80211_rx_status rx_status;
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struct ieee80211_ra_tid *ra_tid;
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while ((skb = skb_dequeue(&local->skb_queue)) ||
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(skb = skb_dequeue(&local->skb_queue_unreliable))) {
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switch (skb->pkt_type) {
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case IEEE80211_RX_MSG:
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/* status is in skb->cb */
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memcpy(&rx_status, skb->cb, sizeof(rx_status));
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/* Clear skb->pkt_type in order to not confuse kernel
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* netstack. */
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skb->pkt_type = 0;
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__ieee80211_rx(local_to_hw(local), skb, &rx_status);
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break;
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case IEEE80211_TX_STATUS_MSG:
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skb->pkt_type = 0;
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ieee80211_tx_status(local_to_hw(local), skb);
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break;
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case IEEE80211_DELBA_MSG:
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ra_tid = (struct ieee80211_ra_tid *) &skb->cb;
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ieee80211_stop_tx_ba_cb(local_to_hw(local),
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ra_tid->ra, ra_tid->tid);
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dev_kfree_skb(skb);
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break;
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case IEEE80211_ADDBA_MSG:
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ra_tid = (struct ieee80211_ra_tid *) &skb->cb;
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ieee80211_start_tx_ba_cb(local_to_hw(local),
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ra_tid->ra, ra_tid->tid);
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dev_kfree_skb(skb);
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break ;
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default:
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WARN(1, "mac80211: Packet is of unknown type %d\n",
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skb->pkt_type);
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dev_kfree_skb(skb);
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break;
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}
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}
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}
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/* Remove added headers (e.g., QoS control), encryption header/MIC, etc. to
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* make a prepared TX frame (one that has been given to hw) to look like brand
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* new IEEE 802.11 frame that is ready to go through TX processing again.
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*/
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static void ieee80211_remove_tx_extra(struct ieee80211_local *local,
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struct ieee80211_key *key,
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struct sk_buff *skb)
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{
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unsigned int hdrlen, iv_len, mic_len;
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struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
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hdrlen = ieee80211_hdrlen(hdr->frame_control);
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if (!key)
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goto no_key;
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switch (key->conf.alg) {
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case ALG_WEP:
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iv_len = WEP_IV_LEN;
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mic_len = WEP_ICV_LEN;
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break;
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case ALG_TKIP:
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iv_len = TKIP_IV_LEN;
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mic_len = TKIP_ICV_LEN;
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break;
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case ALG_CCMP:
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iv_len = CCMP_HDR_LEN;
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mic_len = CCMP_MIC_LEN;
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break;
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default:
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goto no_key;
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}
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if (skb->len >= hdrlen + mic_len &&
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!(key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE))
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skb_trim(skb, skb->len - mic_len);
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if (skb->len >= hdrlen + iv_len) {
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memmove(skb->data + iv_len, skb->data, hdrlen);
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hdr = (struct ieee80211_hdr *)skb_pull(skb, iv_len);
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}
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no_key:
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if (ieee80211_is_data_qos(hdr->frame_control)) {
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hdr->frame_control &= ~cpu_to_le16(IEEE80211_STYPE_QOS_DATA);
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memmove(skb->data + IEEE80211_QOS_CTL_LEN, skb->data,
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hdrlen - IEEE80211_QOS_CTL_LEN);
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skb_pull(skb, IEEE80211_QOS_CTL_LEN);
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}
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}
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static void ieee80211_handle_filtered_frame(struct ieee80211_local *local,
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struct sta_info *sta,
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struct sk_buff *skb)
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{
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sta->tx_filtered_count++;
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/*
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* Clear the TX filter mask for this STA when sending the next
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* packet. If the STA went to power save mode, this will happen
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* when it wakes up for the next time.
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*/
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set_sta_flags(sta, WLAN_STA_CLEAR_PS_FILT);
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/*
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* This code races in the following way:
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*
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* (1) STA sends frame indicating it will go to sleep and does so
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* (2) hardware/firmware adds STA to filter list, passes frame up
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* (3) hardware/firmware processes TX fifo and suppresses a frame
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* (4) we get TX status before having processed the frame and
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* knowing that the STA has gone to sleep.
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*
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* This is actually quite unlikely even when both those events are
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* processed from interrupts coming in quickly after one another or
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* even at the same time because we queue both TX status events and
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* RX frames to be processed by a tasklet and process them in the
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* same order that they were received or TX status last. Hence, there
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* is no race as long as the frame RX is processed before the next TX
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* status, which drivers can ensure, see below.
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*
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* Note that this can only happen if the hardware or firmware can
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* actually add STAs to the filter list, if this is done by the
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* driver in response to set_tim() (which will only reduce the race
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* this whole filtering tries to solve, not completely solve it)
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* this situation cannot happen.
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*
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* To completely solve this race drivers need to make sure that they
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* (a) don't mix the irq-safe/not irq-safe TX status/RX processing
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* functions and
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* (b) always process RX events before TX status events if ordering
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* can be unknown, for example with different interrupt status
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* bits.
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*/
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if (test_sta_flags(sta, WLAN_STA_PS) &&
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skb_queue_len(&sta->tx_filtered) < STA_MAX_TX_BUFFER) {
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ieee80211_remove_tx_extra(local, sta->key, skb);
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skb_queue_tail(&sta->tx_filtered, skb);
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return;
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}
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|
|
if (!test_sta_flags(sta, WLAN_STA_PS) && !skb->requeue) {
|
|
/* Software retry the packet once */
|
|
skb->requeue = 1;
|
|
ieee80211_remove_tx_extra(local, sta->key, skb);
|
|
dev_queue_xmit(skb);
|
|
return;
|
|
}
|
|
|
|
#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
|
|
if (net_ratelimit())
|
|
printk(KERN_DEBUG "%s: dropped TX filtered frame, "
|
|
"queue_len=%d PS=%d @%lu\n",
|
|
wiphy_name(local->hw.wiphy),
|
|
skb_queue_len(&sta->tx_filtered),
|
|
!!test_sta_flags(sta, WLAN_STA_PS), jiffies);
|
|
#endif
|
|
dev_kfree_skb(skb);
|
|
}
|
|
|
|
void ieee80211_tx_status(struct ieee80211_hw *hw, struct sk_buff *skb)
|
|
{
|
|
struct sk_buff *skb2;
|
|
struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
|
|
struct ieee80211_local *local = hw_to_local(hw);
|
|
struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
|
|
u16 frag, type;
|
|
__le16 fc;
|
|
struct ieee80211_supported_band *sband;
|
|
struct ieee80211_tx_status_rtap_hdr *rthdr;
|
|
struct ieee80211_sub_if_data *sdata;
|
|
struct net_device *prev_dev = NULL;
|
|
struct sta_info *sta;
|
|
int retry_count = -1, i;
|
|
|
|
for (i = 0; i < IEEE80211_TX_MAX_RATES; i++) {
|
|
/* the HW cannot have attempted that rate */
|
|
if (i >= hw->max_rates) {
|
|
info->status.rates[i].idx = -1;
|
|
info->status.rates[i].count = 0;
|
|
}
|
|
|
|
retry_count += info->status.rates[i].count;
|
|
}
|
|
if (retry_count < 0)
|
|
retry_count = 0;
|
|
|
|
rcu_read_lock();
|
|
|
|
sband = local->hw.wiphy->bands[info->band];
|
|
|
|
sta = sta_info_get(local, hdr->addr1);
|
|
|
|
if (sta) {
|
|
if (!(info->flags & IEEE80211_TX_STAT_ACK) &&
|
|
test_sta_flags(sta, WLAN_STA_PS)) {
|
|
/*
|
|
* The STA is in power save mode, so assume
|
|
* that this TX packet failed because of that.
|
|
*/
|
|
ieee80211_handle_filtered_frame(local, sta, skb);
|
|
rcu_read_unlock();
|
|
return;
|
|
}
|
|
|
|
fc = hdr->frame_control;
|
|
|
|
if ((info->flags & IEEE80211_TX_STAT_AMPDU_NO_BACK) &&
|
|
(ieee80211_is_data_qos(fc))) {
|
|
u16 tid, ssn;
|
|
u8 *qc;
|
|
|
|
qc = ieee80211_get_qos_ctl(hdr);
|
|
tid = qc[0] & 0xf;
|
|
ssn = ((le16_to_cpu(hdr->seq_ctrl) + 0x10)
|
|
& IEEE80211_SCTL_SEQ);
|
|
ieee80211_send_bar(sta->sdata, hdr->addr1,
|
|
tid, ssn);
|
|
}
|
|
|
|
if (info->flags & IEEE80211_TX_STAT_TX_FILTERED) {
|
|
ieee80211_handle_filtered_frame(local, sta, skb);
|
|
rcu_read_unlock();
|
|
return;
|
|
} else {
|
|
if (!(info->flags & IEEE80211_TX_STAT_ACK))
|
|
sta->tx_retry_failed++;
|
|
sta->tx_retry_count += retry_count;
|
|
}
|
|
|
|
rate_control_tx_status(local, sband, sta, skb);
|
|
}
|
|
|
|
rcu_read_unlock();
|
|
|
|
ieee80211_led_tx(local, 0);
|
|
|
|
/* SNMP counters
|
|
* Fragments are passed to low-level drivers as separate skbs, so these
|
|
* are actually fragments, not frames. Update frame counters only for
|
|
* the first fragment of the frame. */
|
|
|
|
frag = le16_to_cpu(hdr->seq_ctrl) & IEEE80211_SCTL_FRAG;
|
|
type = le16_to_cpu(hdr->frame_control) & IEEE80211_FCTL_FTYPE;
|
|
|
|
if (info->flags & IEEE80211_TX_STAT_ACK) {
|
|
if (frag == 0) {
|
|
local->dot11TransmittedFrameCount++;
|
|
if (is_multicast_ether_addr(hdr->addr1))
|
|
local->dot11MulticastTransmittedFrameCount++;
|
|
if (retry_count > 0)
|
|
local->dot11RetryCount++;
|
|
if (retry_count > 1)
|
|
local->dot11MultipleRetryCount++;
|
|
}
|
|
|
|
/* This counter shall be incremented for an acknowledged MPDU
|
|
* with an individual address in the address 1 field or an MPDU
|
|
* with a multicast address in the address 1 field of type Data
|
|
* or Management. */
|
|
if (!is_multicast_ether_addr(hdr->addr1) ||
|
|
type == IEEE80211_FTYPE_DATA ||
|
|
type == IEEE80211_FTYPE_MGMT)
|
|
local->dot11TransmittedFragmentCount++;
|
|
} else {
|
|
if (frag == 0)
|
|
local->dot11FailedCount++;
|
|
}
|
|
|
|
/* this was a transmitted frame, but now we want to reuse it */
|
|
skb_orphan(skb);
|
|
|
|
/*
|
|
* This is a bit racy but we can avoid a lot of work
|
|
* with this test...
|
|
*/
|
|
if (!local->monitors && !local->cooked_mntrs) {
|
|
dev_kfree_skb(skb);
|
|
return;
|
|
}
|
|
|
|
/* send frame to monitor interfaces now */
|
|
|
|
if (skb_headroom(skb) < sizeof(*rthdr)) {
|
|
printk(KERN_ERR "ieee80211_tx_status: headroom too small\n");
|
|
dev_kfree_skb(skb);
|
|
return;
|
|
}
|
|
|
|
rthdr = (struct ieee80211_tx_status_rtap_hdr *)
|
|
skb_push(skb, sizeof(*rthdr));
|
|
|
|
memset(rthdr, 0, sizeof(*rthdr));
|
|
rthdr->hdr.it_len = cpu_to_le16(sizeof(*rthdr));
|
|
rthdr->hdr.it_present =
|
|
cpu_to_le32((1 << IEEE80211_RADIOTAP_TX_FLAGS) |
|
|
(1 << IEEE80211_RADIOTAP_DATA_RETRIES) |
|
|
(1 << IEEE80211_RADIOTAP_RATE));
|
|
|
|
if (!(info->flags & IEEE80211_TX_STAT_ACK) &&
|
|
!is_multicast_ether_addr(hdr->addr1))
|
|
rthdr->tx_flags |= cpu_to_le16(IEEE80211_RADIOTAP_F_TX_FAIL);
|
|
|
|
/*
|
|
* XXX: Once radiotap gets the bitmap reset thing the vendor
|
|
* extensions proposal contains, we can actually report
|
|
* the whole set of tries we did.
|
|
*/
|
|
if ((info->status.rates[0].flags & IEEE80211_TX_RC_USE_RTS_CTS) ||
|
|
(info->status.rates[0].flags & IEEE80211_TX_RC_USE_CTS_PROTECT))
|
|
rthdr->tx_flags |= cpu_to_le16(IEEE80211_RADIOTAP_F_TX_CTS);
|
|
else if (info->status.rates[0].flags & IEEE80211_TX_RC_USE_RTS_CTS)
|
|
rthdr->tx_flags |= cpu_to_le16(IEEE80211_RADIOTAP_F_TX_RTS);
|
|
if (info->status.rates[0].idx >= 0 &&
|
|
!(info->status.rates[0].flags & IEEE80211_TX_RC_MCS))
|
|
rthdr->rate = sband->bitrates[
|
|
info->status.rates[0].idx].bitrate / 5;
|
|
|
|
/* for now report the total retry_count */
|
|
rthdr->data_retries = retry_count;
|
|
|
|
/* XXX: is this sufficient for BPF? */
|
|
skb_set_mac_header(skb, 0);
|
|
skb->ip_summed = CHECKSUM_UNNECESSARY;
|
|
skb->pkt_type = PACKET_OTHERHOST;
|
|
skb->protocol = htons(ETH_P_802_2);
|
|
memset(skb->cb, 0, sizeof(skb->cb));
|
|
|
|
rcu_read_lock();
|
|
list_for_each_entry_rcu(sdata, &local->interfaces, list) {
|
|
if (sdata->vif.type == NL80211_IFTYPE_MONITOR) {
|
|
if (!netif_running(sdata->dev))
|
|
continue;
|
|
|
|
if (prev_dev) {
|
|
skb2 = skb_clone(skb, GFP_ATOMIC);
|
|
if (skb2) {
|
|
skb2->dev = prev_dev;
|
|
netif_rx(skb2);
|
|
}
|
|
}
|
|
|
|
prev_dev = sdata->dev;
|
|
}
|
|
}
|
|
if (prev_dev) {
|
|
skb->dev = prev_dev;
|
|
netif_rx(skb);
|
|
skb = NULL;
|
|
}
|
|
rcu_read_unlock();
|
|
dev_kfree_skb(skb);
|
|
}
|
|
EXPORT_SYMBOL(ieee80211_tx_status);
|
|
|
|
static void ieee80211_restart_work(struct work_struct *work)
|
|
{
|
|
struct ieee80211_local *local =
|
|
container_of(work, struct ieee80211_local, restart_work);
|
|
|
|
rtnl_lock();
|
|
ieee80211_reconfig(local);
|
|
rtnl_unlock();
|
|
}
|
|
|
|
void ieee80211_restart_hw(struct ieee80211_hw *hw)
|
|
{
|
|
struct ieee80211_local *local = hw_to_local(hw);
|
|
|
|
/* use this reason, __ieee80211_resume will unblock it */
|
|
ieee80211_stop_queues_by_reason(hw,
|
|
IEEE80211_QUEUE_STOP_REASON_SUSPEND);
|
|
|
|
schedule_work(&local->restart_work);
|
|
}
|
|
EXPORT_SYMBOL(ieee80211_restart_hw);
|
|
|
|
struct ieee80211_hw *ieee80211_alloc_hw(size_t priv_data_len,
|
|
const struct ieee80211_ops *ops)
|
|
{
|
|
struct ieee80211_local *local;
|
|
int priv_size, i;
|
|
struct wiphy *wiphy;
|
|
|
|
/* Ensure 32-byte alignment of our private data and hw private data.
|
|
* We use the wiphy priv data for both our ieee80211_local and for
|
|
* the driver's private data
|
|
*
|
|
* In memory it'll be like this:
|
|
*
|
|
* +-------------------------+
|
|
* | struct wiphy |
|
|
* +-------------------------+
|
|
* | struct ieee80211_local |
|
|
* +-------------------------+
|
|
* | driver's private data |
|
|
* +-------------------------+
|
|
*
|
|
*/
|
|
priv_size = ((sizeof(struct ieee80211_local) +
|
|
NETDEV_ALIGN_CONST) & ~NETDEV_ALIGN_CONST) +
|
|
priv_data_len;
|
|
|
|
wiphy = wiphy_new(&mac80211_config_ops, priv_size);
|
|
|
|
if (!wiphy)
|
|
return NULL;
|
|
|
|
wiphy->privid = mac80211_wiphy_privid;
|
|
|
|
/* Yes, putting cfg80211_bss into ieee80211_bss is a hack */
|
|
wiphy->bss_priv_size = sizeof(struct ieee80211_bss) -
|
|
sizeof(struct cfg80211_bss);
|
|
|
|
local = wiphy_priv(wiphy);
|
|
|
|
local->hw.wiphy = wiphy;
|
|
|
|
local->hw.priv = (char *)local +
|
|
((sizeof(struct ieee80211_local) +
|
|
NETDEV_ALIGN_CONST) & ~NETDEV_ALIGN_CONST);
|
|
|
|
BUG_ON(!ops->tx);
|
|
BUG_ON(!ops->start);
|
|
BUG_ON(!ops->stop);
|
|
BUG_ON(!ops->config);
|
|
BUG_ON(!ops->add_interface);
|
|
BUG_ON(!ops->remove_interface);
|
|
BUG_ON(!ops->configure_filter);
|
|
local->ops = ops;
|
|
|
|
/* set up some defaults */
|
|
local->hw.queues = 1;
|
|
local->hw.max_rates = 1;
|
|
local->hw.conf.long_frame_max_tx_count = wiphy->retry_long;
|
|
local->hw.conf.short_frame_max_tx_count = wiphy->retry_short;
|
|
local->hw.conf.radio_enabled = true;
|
|
local->user_power_level = -1;
|
|
|
|
INIT_LIST_HEAD(&local->interfaces);
|
|
mutex_init(&local->iflist_mtx);
|
|
mutex_init(&local->scan_mtx);
|
|
|
|
spin_lock_init(&local->key_lock);
|
|
|
|
spin_lock_init(&local->queue_stop_reason_lock);
|
|
|
|
INIT_DELAYED_WORK(&local->scan_work, ieee80211_scan_work);
|
|
|
|
INIT_WORK(&local->restart_work, ieee80211_restart_work);
|
|
|
|
INIT_WORK(&local->dynamic_ps_enable_work,
|
|
ieee80211_dynamic_ps_enable_work);
|
|
INIT_WORK(&local->dynamic_ps_disable_work,
|
|
ieee80211_dynamic_ps_disable_work);
|
|
setup_timer(&local->dynamic_ps_timer,
|
|
ieee80211_dynamic_ps_timer, (unsigned long) local);
|
|
|
|
sta_info_init(local);
|
|
|
|
for (i = 0; i < IEEE80211_MAX_QUEUES; i++)
|
|
skb_queue_head_init(&local->pending[i]);
|
|
tasklet_init(&local->tx_pending_tasklet, ieee80211_tx_pending,
|
|
(unsigned long)local);
|
|
tasklet_disable(&local->tx_pending_tasklet);
|
|
|
|
tasklet_init(&local->tasklet,
|
|
ieee80211_tasklet_handler,
|
|
(unsigned long) local);
|
|
tasklet_disable(&local->tasklet);
|
|
|
|
skb_queue_head_init(&local->skb_queue);
|
|
skb_queue_head_init(&local->skb_queue_unreliable);
|
|
|
|
spin_lock_init(&local->ampdu_lock);
|
|
|
|
return local_to_hw(local);
|
|
}
|
|
EXPORT_SYMBOL(ieee80211_alloc_hw);
|
|
|
|
static const struct net_device_ops ieee80211_master_ops = {
|
|
.ndo_start_xmit = ieee80211_master_start_xmit,
|
|
.ndo_open = ieee80211_master_open,
|
|
.ndo_stop = ieee80211_master_stop,
|
|
.ndo_set_multicast_list = ieee80211_master_set_multicast_list,
|
|
.ndo_select_queue = ieee80211_select_queue,
|
|
};
|
|
|
|
static void ieee80211_master_setup(struct net_device *mdev)
|
|
{
|
|
mdev->type = ARPHRD_IEEE80211;
|
|
mdev->netdev_ops = &ieee80211_master_ops;
|
|
mdev->header_ops = &ieee80211_header_ops;
|
|
mdev->tx_queue_len = 1000;
|
|
mdev->addr_len = ETH_ALEN;
|
|
}
|
|
|
|
int ieee80211_register_hw(struct ieee80211_hw *hw)
|
|
{
|
|
struct ieee80211_local *local = hw_to_local(hw);
|
|
int result;
|
|
enum ieee80211_band band;
|
|
struct net_device *mdev;
|
|
struct ieee80211_master_priv *mpriv;
|
|
int channels, i, j, max_bitrates;
|
|
bool supp_ht;
|
|
static const u32 cipher_suites[] = {
|
|
WLAN_CIPHER_SUITE_WEP40,
|
|
WLAN_CIPHER_SUITE_WEP104,
|
|
WLAN_CIPHER_SUITE_TKIP,
|
|
WLAN_CIPHER_SUITE_CCMP,
|
|
|
|
/* keep last -- depends on hw flags! */
|
|
WLAN_CIPHER_SUITE_AES_CMAC
|
|
};
|
|
|
|
/*
|
|
* generic code guarantees at least one band,
|
|
* set this very early because much code assumes
|
|
* that hw.conf.channel is assigned
|
|
*/
|
|
channels = 0;
|
|
max_bitrates = 0;
|
|
supp_ht = false;
|
|
for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
|
|
struct ieee80211_supported_band *sband;
|
|
|
|
sband = local->hw.wiphy->bands[band];
|
|
if (!sband)
|
|
continue;
|
|
if (!local->oper_channel) {
|
|
/* init channel we're on */
|
|
local->hw.conf.channel =
|
|
local->oper_channel = &sband->channels[0];
|
|
local->hw.conf.channel_type = NL80211_CHAN_NO_HT;
|
|
}
|
|
channels += sband->n_channels;
|
|
|
|
if (max_bitrates < sband->n_bitrates)
|
|
max_bitrates = sband->n_bitrates;
|
|
supp_ht = supp_ht || sband->ht_cap.ht_supported;
|
|
}
|
|
|
|
local->int_scan_req.n_channels = channels;
|
|
local->int_scan_req.channels = kzalloc(sizeof(void *) * channels, GFP_KERNEL);
|
|
if (!local->int_scan_req.channels)
|
|
return -ENOMEM;
|
|
|
|
/* if low-level driver supports AP, we also support VLAN */
|
|
if (local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_AP))
|
|
local->hw.wiphy->interface_modes |= BIT(NL80211_IFTYPE_AP_VLAN);
|
|
|
|
/* mac80211 always supports monitor */
|
|
local->hw.wiphy->interface_modes |= BIT(NL80211_IFTYPE_MONITOR);
|
|
|
|
if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM)
|
|
local->hw.wiphy->signal_type = CFG80211_SIGNAL_TYPE_MBM;
|
|
else if (local->hw.flags & IEEE80211_HW_SIGNAL_UNSPEC)
|
|
local->hw.wiphy->signal_type = CFG80211_SIGNAL_TYPE_UNSPEC;
|
|
|
|
/*
|
|
* Calculate scan IE length -- we need this to alloc
|
|
* memory and to subtract from the driver limit. It
|
|
* includes the (extended) supported rates and HT
|
|
* information -- SSID is the driver's responsibility.
|
|
*/
|
|
local->scan_ies_len = 4 + max_bitrates; /* (ext) supp rates */
|
|
if (supp_ht)
|
|
local->scan_ies_len += 2 + sizeof(struct ieee80211_ht_cap);
|
|
|
|
if (!local->ops->hw_scan) {
|
|
/* For hw_scan, driver needs to set these up. */
|
|
local->hw.wiphy->max_scan_ssids = 4;
|
|
local->hw.wiphy->max_scan_ie_len = IEEE80211_MAX_DATA_LEN;
|
|
}
|
|
|
|
/*
|
|
* If the driver supports any scan IEs, then assume the
|
|
* limit includes the IEs mac80211 will add, otherwise
|
|
* leave it at zero and let the driver sort it out; we
|
|
* still pass our IEs to the driver but userspace will
|
|
* not be allowed to in that case.
|
|
*/
|
|
if (local->hw.wiphy->max_scan_ie_len)
|
|
local->hw.wiphy->max_scan_ie_len -= local->scan_ies_len;
|
|
|
|
local->hw.wiphy->cipher_suites = cipher_suites;
|
|
local->hw.wiphy->n_cipher_suites = ARRAY_SIZE(cipher_suites);
|
|
if (!(local->hw.flags & IEEE80211_HW_MFP_CAPABLE))
|
|
local->hw.wiphy->n_cipher_suites--;
|
|
|
|
result = wiphy_register(local->hw.wiphy);
|
|
if (result < 0)
|
|
goto fail_wiphy_register;
|
|
|
|
/*
|
|
* We use the number of queues for feature tests (QoS, HT) internally
|
|
* so restrict them appropriately.
|
|
*/
|
|
if (hw->queues > IEEE80211_MAX_QUEUES)
|
|
hw->queues = IEEE80211_MAX_QUEUES;
|
|
|
|
mdev = alloc_netdev_mq(sizeof(struct ieee80211_master_priv),
|
|
"wmaster%d", ieee80211_master_setup,
|
|
hw->queues);
|
|
if (!mdev)
|
|
goto fail_mdev_alloc;
|
|
|
|
mpriv = netdev_priv(mdev);
|
|
mpriv->local = local;
|
|
local->mdev = mdev;
|
|
|
|
local->hw.workqueue =
|
|
create_singlethread_workqueue(wiphy_name(local->hw.wiphy));
|
|
if (!local->hw.workqueue) {
|
|
result = -ENOMEM;
|
|
goto fail_workqueue;
|
|
}
|
|
|
|
/*
|
|
* The hardware needs headroom for sending the frame,
|
|
* and we need some headroom for passing the frame to monitor
|
|
* interfaces, but never both at the same time.
|
|
*/
|
|
local->tx_headroom = max_t(unsigned int , local->hw.extra_tx_headroom,
|
|
sizeof(struct ieee80211_tx_status_rtap_hdr));
|
|
|
|
debugfs_hw_add(local);
|
|
|
|
if (local->hw.max_listen_interval == 0)
|
|
local->hw.max_listen_interval = 1;
|
|
|
|
local->hw.conf.listen_interval = local->hw.max_listen_interval;
|
|
|
|
result = sta_info_start(local);
|
|
if (result < 0)
|
|
goto fail_sta_info;
|
|
|
|
result = ieee80211_wep_init(local);
|
|
if (result < 0) {
|
|
printk(KERN_DEBUG "%s: Failed to initialize wep: %d\n",
|
|
wiphy_name(local->hw.wiphy), result);
|
|
goto fail_wep;
|
|
}
|
|
|
|
rtnl_lock();
|
|
result = dev_alloc_name(local->mdev, local->mdev->name);
|
|
if (result < 0)
|
|
goto fail_dev;
|
|
|
|
memcpy(local->mdev->dev_addr, local->hw.wiphy->perm_addr, ETH_ALEN);
|
|
SET_NETDEV_DEV(local->mdev, wiphy_dev(local->hw.wiphy));
|
|
local->mdev->features |= NETIF_F_NETNS_LOCAL;
|
|
|
|
result = register_netdevice(local->mdev);
|
|
if (result < 0)
|
|
goto fail_dev;
|
|
|
|
result = ieee80211_init_rate_ctrl_alg(local,
|
|
hw->rate_control_algorithm);
|
|
if (result < 0) {
|
|
printk(KERN_DEBUG "%s: Failed to initialize rate control "
|
|
"algorithm\n", wiphy_name(local->hw.wiphy));
|
|
goto fail_rate;
|
|
}
|
|
|
|
/* add one default STA interface if supported */
|
|
if (local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_STATION)) {
|
|
result = ieee80211_if_add(local, "wlan%d", NULL,
|
|
NL80211_IFTYPE_STATION, NULL);
|
|
if (result)
|
|
printk(KERN_WARNING "%s: Failed to add default virtual iface\n",
|
|
wiphy_name(local->hw.wiphy));
|
|
}
|
|
|
|
rtnl_unlock();
|
|
|
|
ieee80211_led_init(local);
|
|
|
|
/* alloc internal scan request */
|
|
i = 0;
|
|
local->int_scan_req.ssids = &local->scan_ssid;
|
|
local->int_scan_req.n_ssids = 1;
|
|
for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
|
|
if (!hw->wiphy->bands[band])
|
|
continue;
|
|
for (j = 0; j < hw->wiphy->bands[band]->n_channels; j++) {
|
|
local->int_scan_req.channels[i] =
|
|
&hw->wiphy->bands[band]->channels[j];
|
|
i++;
|
|
}
|
|
}
|
|
|
|
local->network_latency_notifier.notifier_call =
|
|
ieee80211_max_network_latency;
|
|
result = pm_qos_add_notifier(PM_QOS_NETWORK_LATENCY,
|
|
&local->network_latency_notifier);
|
|
|
|
if (result) {
|
|
rtnl_lock();
|
|
goto fail_pm_qos;
|
|
}
|
|
|
|
return 0;
|
|
|
|
fail_pm_qos:
|
|
ieee80211_led_exit(local);
|
|
ieee80211_remove_interfaces(local);
|
|
fail_rate:
|
|
unregister_netdevice(local->mdev);
|
|
local->mdev = NULL;
|
|
fail_dev:
|
|
rtnl_unlock();
|
|
ieee80211_wep_free(local);
|
|
fail_wep:
|
|
sta_info_stop(local);
|
|
fail_sta_info:
|
|
debugfs_hw_del(local);
|
|
destroy_workqueue(local->hw.workqueue);
|
|
fail_workqueue:
|
|
if (local->mdev)
|
|
free_netdev(local->mdev);
|
|
fail_mdev_alloc:
|
|
wiphy_unregister(local->hw.wiphy);
|
|
fail_wiphy_register:
|
|
kfree(local->int_scan_req.channels);
|
|
return result;
|
|
}
|
|
EXPORT_SYMBOL(ieee80211_register_hw);
|
|
|
|
void ieee80211_unregister_hw(struct ieee80211_hw *hw)
|
|
{
|
|
struct ieee80211_local *local = hw_to_local(hw);
|
|
|
|
tasklet_kill(&local->tx_pending_tasklet);
|
|
tasklet_kill(&local->tasklet);
|
|
|
|
pm_qos_remove_notifier(PM_QOS_NETWORK_LATENCY,
|
|
&local->network_latency_notifier);
|
|
|
|
rtnl_lock();
|
|
|
|
/*
|
|
* At this point, interface list manipulations are fine
|
|
* because the driver cannot be handing us frames any
|
|
* more and the tasklet is killed.
|
|
*/
|
|
|
|
/* First, we remove all virtual interfaces. */
|
|
ieee80211_remove_interfaces(local);
|
|
|
|
/* then, finally, remove the master interface */
|
|
unregister_netdevice(local->mdev);
|
|
|
|
rtnl_unlock();
|
|
|
|
ieee80211_clear_tx_pending(local);
|
|
sta_info_stop(local);
|
|
rate_control_deinitialize(local);
|
|
debugfs_hw_del(local);
|
|
|
|
if (skb_queue_len(&local->skb_queue)
|
|
|| skb_queue_len(&local->skb_queue_unreliable))
|
|
printk(KERN_WARNING "%s: skb_queue not empty\n",
|
|
wiphy_name(local->hw.wiphy));
|
|
skb_queue_purge(&local->skb_queue);
|
|
skb_queue_purge(&local->skb_queue_unreliable);
|
|
|
|
destroy_workqueue(local->hw.workqueue);
|
|
wiphy_unregister(local->hw.wiphy);
|
|
ieee80211_wep_free(local);
|
|
ieee80211_led_exit(local);
|
|
free_netdev(local->mdev);
|
|
kfree(local->int_scan_req.channels);
|
|
}
|
|
EXPORT_SYMBOL(ieee80211_unregister_hw);
|
|
|
|
void ieee80211_free_hw(struct ieee80211_hw *hw)
|
|
{
|
|
struct ieee80211_local *local = hw_to_local(hw);
|
|
|
|
mutex_destroy(&local->iflist_mtx);
|
|
mutex_destroy(&local->scan_mtx);
|
|
|
|
wiphy_free(local->hw.wiphy);
|
|
}
|
|
EXPORT_SYMBOL(ieee80211_free_hw);
|
|
|
|
static int __init ieee80211_init(void)
|
|
{
|
|
struct sk_buff *skb;
|
|
int ret;
|
|
|
|
BUILD_BUG_ON(sizeof(struct ieee80211_tx_info) > sizeof(skb->cb));
|
|
BUILD_BUG_ON(offsetof(struct ieee80211_tx_info, driver_data) +
|
|
IEEE80211_TX_INFO_DRIVER_DATA_SIZE > sizeof(skb->cb));
|
|
|
|
ret = rc80211_minstrel_init();
|
|
if (ret)
|
|
return ret;
|
|
|
|
ret = rc80211_pid_init();
|
|
if (ret)
|
|
return ret;
|
|
|
|
ieee80211_debugfs_netdev_init();
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void __exit ieee80211_exit(void)
|
|
{
|
|
rc80211_pid_exit();
|
|
rc80211_minstrel_exit();
|
|
|
|
/*
|
|
* For key todo, it'll be empty by now but the work
|
|
* might still be scheduled.
|
|
*/
|
|
flush_scheduled_work();
|
|
|
|
if (mesh_allocated)
|
|
ieee80211s_stop();
|
|
|
|
ieee80211_debugfs_netdev_exit();
|
|
}
|
|
|
|
|
|
subsys_initcall(ieee80211_init);
|
|
module_exit(ieee80211_exit);
|
|
|
|
MODULE_DESCRIPTION("IEEE 802.11 subsystem");
|
|
MODULE_LICENSE("GPL");
|