path: root/net/mac80211/main.c

// SPDX-License-Identifier: GPL-2.0-only
/*
 * Copyright 2002-2005, Instant802 Networks, Inc.
 * Copyright 2005-2006, Devicescape Software, Inc.
 * Copyright 2006-2007	Jiri Benc <jbenc@suse.cz>
 * Copyright 2013-2014  Intel Mobile Communications GmbH
 * Copyright (C) 2017     Intel Deutschland GmbH
 * Copyright (C) 2018-2022 Intel Corporation
 */

#include <net/mac80211.h>
#include <linux/module.h>
#include <linux/fips.h>
#include <linux/init.h>
#include <linux/netdevice.h>
#include <linux/types.h>
#include <linux/slab.h>
#include <linux/skbuff.h>
#include <linux/etherdevice.h>
#include <linux/if_arp.h>
#include <linux/rtnetlink.h>
#include <linux/bitmap.h>
#include <linux/inetdevice.h>
#include <net/net_namespace.h>
#include <net/cfg80211.h>
#include <net/addrconf.h>

#include "ieee80211_i.h"
#include "driver-ops.h"
#include "rate.h"
#include "mesh.h"
#include "wep.h"
#include "led.h"
#include "debugfs.h"

void ieee80211_configure_filter(struct ieee80211_local *local)
{
	u64 mc;
	unsigned int changed_flags;
	unsigned int new_flags = 0;

	if (atomic_read(&local->iff_allmultis))
		new_flags |= FIF_ALLMULTI;

	if (local->monitors || test_bit(SCAN_SW_SCANNING, &local->scanning) ||
	    test_bit(SCAN_ONCHANNEL_SCANNING, &local->scanning))
		new_flags |= FIF_BCN_PRBRESP_PROMISC;

	if (local->fif_probe_req || local->probe_req_reg)
		new_flags |= FIF_PROBE_REQ;

	if (local->fif_fcsfail)
		new_flags |= FIF_FCSFAIL;

	if (local->fif_plcpfail)
		new_flags |= FIF_PLCPFAIL;

	if (local->fif_control)
		new_flags |= FIF_CONTROL;

	if (local->fif_other_bss)
		new_flags |= FIF_OTHER_BSS;

	if (local->fif_pspoll)
		new_flags |= FIF_PSPOLL;

	if (local->rx_mcast_action_reg)
		new_flags |= FIF_MCAST_ACTION;

	spin_lock_bh(&local->filter_lock);
	changed_flags = local->filter_flags ^ new_flags;

	mc = drv_prepare_multicast(local, &local->mc_list);
	spin_unlock_bh(&local->filter_lock);

	/* be a bit nasty */
	new_flags |= (1<<31);

	drv_configure_filter(local, changed_flags, &new_flags, mc);

	WARN_ON(new_flags & (1<<31));

	local->filter_flags = new_flags & ~(1<<31);
}

static void ieee80211_reconfig_filter(struct work_struct *work)
{
	struct ieee80211_local *local =
		container_of(work, struct ieee80211_local, reconfig_filter);

	ieee80211_configure_filter(local);
}

static u32 ieee80211_hw_conf_chan(struct ieee80211_local *local)
{
	struct ieee80211_sub_if_data *sdata;
	struct cfg80211_chan_def chandef = {};
	u32 changed = 0;
	int power;
	u32 offchannel_flag;

	offchannel_flag = local->hw.conf.flags & IEEE80211_CONF_OFFCHANNEL;

	if (local->scan_chandef.chan) {
		chandef = local->scan_chandef;
	} else if (local->tmp_channel) {
		chandef.chan = local->tmp_channel;
		chandef.width = NL80211_CHAN_WIDTH_20_NOHT;
		chandef.center_freq1 = chandef.chan->center_freq;
		chandef.freq1_offset = chandef.chan->freq_offset;
	} else
		chandef = local->_oper_chandef;

	WARN(!cfg80211_chandef_valid(&chandef),
	     "control:%d.%03d MHz width:%d center: %d.%03d/%d MHz",
	     chandef.chan->center_freq, chandef.chan->freq_offset,
	     chandef.width, chandef.center_freq1, chandef.freq1_offset,
	     chandef.center_freq2);

	if (!cfg80211_chandef_identical(&chandef, &local->_oper_chandef))
		local->hw.conf.flags |= IEEE80211_CONF_OFFCHANNEL;
	else
		local->hw.conf.flags &= ~IEEE80211_CONF_OFFCHANNEL;

	offchannel_flag ^= local->hw.conf.flags & IEEE80211_CONF_OFFCHANNEL;

	if (offchannel_flag ||
	    !cfg80211_chandef_identical(&local->hw.conf.chandef,
					&local->_oper_chandef)) {
		local->hw.conf.chandef = chandef;
		changed |= IEEE80211_CONF_CHANGE_CHANNEL;
	}

	if (!conf_is_ht(&local->hw.conf)) {
		/*
		 * mac80211.h documents that this is only valid
		 * when the channel is set to an HT type, and
		 * that otherwise STATIC is used.
		 */
		local->hw.conf.smps_mode = IEEE80211_SMPS_STATIC;
	} else if (local->hw.conf.smps_mode != local->smps_mode) {
		local->hw.conf.smps_mode = local->smps_mode;
		changed |= IEEE80211_CONF_CHANGE_SMPS;
	}

	power = ieee80211_chandef_max_power(&chandef);

	rcu_read_lock();
	list_for_each_entry_rcu(sdata, &local->interfaces, list) {
		if (!rcu_access_pointer(sdata->vif.bss_conf.chanctx_conf))
			continue;
		if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
			continue;
		if (sdata->vif.bss_conf.txpower == INT_MIN)
			continue;
		power = min(power, sdata->vif.bss_conf.txpower);
	}
	rcu_read_unlock();

	if (local->hw.conf.power_level != power) {
		changed |= IEEE80211_CONF_CHANGE_POWER;
		local->hw.conf.power_level = power;
	}

	return changed;
}

int ieee80211_hw_config(struct ieee80211_local *local, u32 changed)
{
	int ret = 0;

	might_sleep();

	if (!local->use_chanctx)
		changed |= ieee80211_hw_conf_chan(local);
	else
		changed &= ~(IEEE80211_CONF_CHANGE_CHANNEL |
			     IEEE80211_CONF_CHANGE_POWER |
			     IEEE80211_CONF_CHANGE_SMPS);

	if (changed && local->open_count) {
		ret = drv_config(local, changed);
		/*
		 * Goal:
		 * HW reconfiguration should never fail, the driver has told
		 * us what it can support so it should live up to that promise.
		 *
		 * Current status:
		 * rfkill is not integrated with mac80211 and a
		 * configuration command can thus fail if hardware rfkill
		 * is enabled
		 *
		 * FIXME: integrate rfkill with mac80211 and then add this
		 * WARN_ON() back
		 *
		 */
		/* WARN_ON(ret); */
	}

	return ret;
}

#define BSS_CHANGED_VIF_CFG_FLAGS (BSS_CHANGED_ASSOC |\
				   BSS_CHANGED_IDLE |\
				   BSS_CHANGED_PS |\
				   BSS_CHANGED_IBSS |\
				   BSS_CHANGED_ARP_FILTER |\
				   BSS_CHANGED_SSID)

void ieee80211_bss_info_change_notify(struct ieee80211_sub_if_data *sdata,
				      u64 changed)
{
	struct ieee80211_local *local = sdata->local;

	might_sleep();

	if (!changed || sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
		return;

	if (WARN_ON_ONCE(changed & (BSS_CHANGED_BEACON |
				    BSS_CHANGED_BEACON_ENABLED) &&
			 sdata->vif.type != NL80211_IFTYPE_AP &&
			 sdata->vif.type != NL80211_IFTYPE_ADHOC &&
			 sdata->vif.type != NL80211_IFTYPE_MESH_POINT &&
			 sdata->vif.type != NL80211_IFTYPE_OCB))
		return;

	if (WARN_ON_ONCE(sdata->vif.type =