tx.c 77.4 KB
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/*
 * Copyright 2002-2005, Instant802 Networks, Inc.
 * Copyright 2005-2006, Devicescape Software, Inc.
 * Copyright 2006-2007	Jiri Benc <jbenc@suse.cz>
 * Copyright 2007	Johannes Berg <johannes@sipsolutions.net>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 *
 *
 * Transmit and frame generation functions.
 */

#include <linux/kernel.h>
#include <linux/slab.h>
#include <linux/skbuff.h>
#include <linux/etherdevice.h>
#include <linux/bitmap.h>
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#include <linux/rcupdate.h>
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#include <linux/export.h>
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#include <net/net_namespace.h>
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#include <net/ieee80211_radiotap.h>
#include <net/cfg80211.h>
#include <net/mac80211.h>
#include <asm/unaligned.h>

#include "ieee80211_i.h"
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#include "driver-ops.h"
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#include "led.h"
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#include "mesh.h"
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#include "wep.h"
#include "wpa.h"
#include "wme.h"
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#include "rate.h"
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/* misc utils */

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static __le16 ieee80211_duration(struct ieee80211_tx_data *tx,
				 struct sk_buff *skb, int group_addr,
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				 int next_frag_len)
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{
	int rate, mrate, erp, dur, i;
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	struct ieee80211_rate *txrate;
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	struct ieee80211_local *local = tx->local;
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	struct ieee80211_supported_band *sband;
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	struct ieee80211_hdr *hdr;
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	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
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	/* assume HW handles this */
	if (info->control.rates[0].flags & IEEE80211_TX_RC_MCS)
		return 0;

	/* uh huh? */
	if (WARN_ON_ONCE(info->control.rates[0].idx < 0))
		return 0;
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	sband = local->hw.wiphy->bands[info->band];
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	txrate = &sband->bitrates[info->control.rates[0].idx];
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	erp = txrate->flags & IEEE80211_RATE_ERP_G;
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	/*
	 * data and mgmt (except PS Poll):
	 * - during CFP: 32768
	 * - during contention period:
	 *   if addr1 is group address: 0
	 *   if more fragments = 0 and addr1 is individual address: time to
	 *      transmit one ACK plus SIFS
	 *   if more fragments = 1 and addr1 is individual address: time to
	 *      transmit next fragment plus 2 x ACK plus 3 x SIFS
	 *
	 * IEEE 802.11, 9.6:
	 * - control response frame (CTS or ACK) shall be transmitted using the
	 *   same rate as the immediately previous frame in the frame exchange
	 *   sequence, if this rate belongs to the PHY mandatory rates, or else
	 *   at the highest possible rate belonging to the PHY rates in the
	 *   BSSBasicRateSet
	 */
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	hdr = (struct ieee80211_hdr *)skb->data;
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	if (ieee80211_is_ctl(hdr->frame_control)) {
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		/* TODO: These control frames are not currently sent by
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		 * mac80211, but should they be implemented, this function
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		 * needs to be updated to support duration field calculation.
		 *
		 * RTS: time needed to transmit pending data/mgmt frame plus
		 *    one CTS frame plus one ACK frame plus 3 x SIFS
		 * CTS: duration of immediately previous RTS minus time
		 *    required to transmit CTS and its SIFS
		 * ACK: 0 if immediately previous directed data/mgmt had
		 *    more=0, with more=1 duration in ACK frame is duration
		 *    from previous frame minus time needed to transmit ACK
		 *    and its SIFS
		 * PS Poll: BIT(15) | BIT(14) | aid
		 */
		return 0;
	}

	/* data/mgmt */
	if (0 /* FIX: data/mgmt during CFP */)
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		return cpu_to_le16(32768);
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	if (group_addr) /* Group address as the destination - no ACK */
		return 0;

	/* Individual destination address:
	 * IEEE 802.11, Ch. 9.6 (after IEEE 802.11g changes)
	 * CTS and ACK frames shall be transmitted using the highest rate in
	 * basic rate set that is less than or equal to the rate of the
	 * immediately previous frame and that is using the same modulation
	 * (CCK or OFDM). If no basic rate set matches with these requirements,
	 * the highest mandatory rate of the PHY that is less than or equal to
	 * the rate of the previous frame is used.
	 * Mandatory rates for IEEE 802.11g PHY: 1, 2, 5.5, 11, 6, 12, 24 Mbps
	 */
	rate = -1;
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	/* use lowest available if everything fails */
	mrate = sband->bitrates[0].bitrate;
	for (i = 0; i < sband->n_bitrates; i++) {
		struct ieee80211_rate *r = &sband->bitrates[i];
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		if (r->bitrate > txrate->bitrate)
			break;
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		if (tx->sdata->vif.bss_conf.basic_rates & BIT(i))
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			rate = r->bitrate;

		switch (sband->band) {
		case IEEE80211_BAND_2GHZ: {
			u32 flag;
			if (tx->sdata->flags & IEEE80211_SDATA_OPERATING_GMODE)
				flag = IEEE80211_RATE_MANDATORY_G;
			else
				flag = IEEE80211_RATE_MANDATORY_B;
			if (r->flags & flag)
				mrate = r->bitrate;
			break;
		}
		case IEEE80211_BAND_5GHZ:
			if (r->flags & IEEE80211_RATE_MANDATORY_A)
				mrate = r->bitrate;
			break;
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		case IEEE80211_BAND_60GHZ:
			/* TODO, for now fall through */
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		case IEEE80211_NUM_BANDS:
			WARN_ON(1);
			break;
		}
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	}
	if (rate == -1) {
		/* No matching basic rate found; use highest suitable mandatory
		 * PHY rate */
		rate = mrate;
	}

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	/* Don't calculate ACKs for QoS Frames with NoAck Policy set */
	if (ieee80211_is_data_qos(hdr->frame_control) &&
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	    *(ieee80211_get_qos_ctl(hdr)) & IEEE80211_QOS_CTL_ACK_POLICY_NOACK)
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		dur = 0;
	else
		/* Time needed to transmit ACK
		 * (10 bytes + 4-byte FCS = 112 bits) plus SIFS; rounded up
		 * to closest integer */
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		dur = ieee80211_frame_duration(sband->band, 10, rate, erp,
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				tx->sdata->vif.bss_conf.use_short_preamble);
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	if (next_frag_len) {
		/* Frame is fragmented: duration increases with time needed to
		 * transmit next fragment plus ACK and 2 x SIFS. */
		dur *= 2; /* ACK + SIFS */
		/* next fragment */
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		dur += ieee80211_frame_duration(sband->band, next_frag_len,
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				txrate->bitrate, erp,
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				tx->sdata->vif.bss_conf.use_short_preamble);
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	}

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	return cpu_to_le16(dur);
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}

/* tx handlers */
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static ieee80211_tx_result debug_noinline
ieee80211_tx_h_dynamic_ps(struct ieee80211_tx_data *tx)
{
	struct ieee80211_local *local = tx->local;
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	struct ieee80211_if_managed *ifmgd;
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	/* driver doesn't support power save */
	if (!(local->hw.flags & IEEE80211_HW_SUPPORTS_PS))
		return TX_CONTINUE;

	/* hardware does dynamic power save */
	if (local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_PS)
		return TX_CONTINUE;

	/* dynamic power save disabled */
	if (local->hw.conf.dynamic_ps_timeout <= 0)
		return TX_CONTINUE;

	/* we are scanning, don't enable power save */
	if (local->scanning)
		return TX_CONTINUE;

	if (!local->ps_sdata)
		return TX_CONTINUE;

	/* No point if we're going to suspend */
	if (local->quiescing)
		return TX_CONTINUE;

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	/* dynamic ps is supported only in managed mode */
	if (tx->sdata->vif.type != NL80211_IFTYPE_STATION)
		return TX_CONTINUE;

	ifmgd = &tx->sdata->u.mgd;

	/*
	 * Don't wakeup from power save if u-apsd is enabled, voip ac has
	 * u-apsd enabled and the frame is in voip class. This effectively
	 * means that even if all access categories have u-apsd enabled, in
	 * practise u-apsd is only used with the voip ac. This is a
	 * workaround for the case when received voip class packets do not
	 * have correct qos tag for some reason, due the network or the
	 * peer application.
	 *
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	 * Note: ifmgd->uapsd_queues access is racy here. If the value is
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	 * changed via debugfs, user needs to reassociate manually to have
	 * everything in sync.
	 */
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	if ((ifmgd->flags & IEEE80211_STA_UAPSD_ENABLED) &&
	    (ifmgd->uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VO) &&
	    skb_get_queue_mapping(tx->skb) == IEEE80211_AC_VO)
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		return TX_CONTINUE;

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	if (local->hw.conf.flags & IEEE80211_CONF_PS) {
		ieee80211_stop_queues_by_reason(&local->hw,
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						IEEE80211_MAX_QUEUE_MAP,
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						IEEE80211_QUEUE_STOP_REASON_PS);
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		ifmgd->flags &= ~IEEE80211_STA_NULLFUNC_ACKED;
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		ieee80211_queue_work(&local->hw,
				     &local->dynamic_ps_disable_work);
	}

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	/* Don't restart the timer if we're not disassociated */
	if (!ifmgd->associated)
		return TX_CONTINUE;

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	mod_timer(&local->dynamic_ps_timer, jiffies +
		  msecs_to_jiffies(local->hw.conf.dynamic_ps_timeout));

	return TX_CONTINUE;
}
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static ieee80211_tx_result debug_noinline
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ieee80211_tx_h_check_assoc(struct ieee80211_tx_data *tx)
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{
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	struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
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	bool assoc = false;
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	if (unlikely(info->flags & IEEE80211_TX_CTL_INJECTED))
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		return TX_CONTINUE;
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	if (unlikely(test_bit(SCAN_SW_SCANNING, &tx->local->scanning)) &&
	    test_bit(SDATA_STATE_OFFCHANNEL, &tx->sdata->state) &&
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	    !ieee80211_is_probe_req(hdr->frame_control) &&
	    !ieee80211_is_nullfunc(hdr->frame_control))
		/*
		 * When software scanning only nullfunc frames (to notify
		 * the sleep state to the AP) and probe requests (for the
		 * active scan) are allowed, all other frames should not be
		 * sent and we should not get here, but if we do
		 * nonetheless, drop them to avoid sending them
		 * off-channel. See the link below and
		 * ieee80211_start_scan() for more.
		 *
		 * http://article.gmane.org/gmane.linux.kernel.wireless.general/30089
		 */
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		return TX_DROP;
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	if (tx->sdata->vif.type == NL80211_IFTYPE_WDS)
		return TX_CONTINUE;

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	if (tx->sdata->vif.type == NL80211_IFTYPE_MESH_POINT)
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		return TX_CONTINUE;

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	if (tx->flags & IEEE80211_TX_PS_BUFFERED)
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		return TX_CONTINUE;
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	if (tx->sta)
		assoc = test_sta_flag(tx->sta, WLAN_STA_ASSOC);
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	if (likely(tx->flags & IEEE80211_TX_UNICAST)) {
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		if (unlikely(!assoc &&
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			     ieee80211_is_data(hdr->frame_control))) {
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#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
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			sdata_info(tx->sdata,
				   "dropped data frame to not associated station %pM\n",
				   hdr->addr1);
#endif
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			I802_DEBUG_INC(tx->local->tx_handlers_drop_not_assoc);
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			return TX_DROP;
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		}
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	} else if (unlikely(tx->sdata->vif.type == NL80211_IFTYPE_AP &&
			    ieee80211_is_data(hdr->frame_control) &&
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			    !atomic_read(&tx->sdata->u.ap.num_mcast_sta))) {
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		/*
		 * No associated STAs - no need to send multicast
		 * frames.
		 */
		return TX_DROP;
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	}

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	return TX_CONTINUE;
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}

/* This function is called whenever the AP is about to exceed the maximum limit
 * of buffered frames for power saving STAs. This situation should not really
 * happen often during normal operation, so dropping the oldest buffered packet
 * from each queue should be OK to make some room for new frames. */
static void purge_old_ps_buffers(struct ieee80211_local *local)
{
	int total = 0, purged = 0;
	struct sk_buff *skb;
	struct ieee80211_sub_if_data *sdata;
	struct sta_info *sta;

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	list_for_each_entry_rcu(sdata, &local->interfaces, list) {
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		struct ps_data *ps;

		if (sdata->vif.type == NL80211_IFTYPE_AP)
			ps = &sdata->u.ap.ps;
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		else if (ieee80211_vif_is_mesh(&sdata->vif))
			ps = &sdata->u.mesh.ps;
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		else
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			continue;
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		skb = skb_dequeue(&ps->bc_buf);
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		if (skb) {
			purged++;
			dev_kfree_skb(skb);
		}
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		total += skb_queue_len(&ps->bc_buf);
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	}

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	/*
	 * Drop one frame from each station from the lowest-priority
	 * AC that has frames at all.
	 */
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	list_for_each_entry_rcu(sta, &local->sta_list, list) {
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		int ac;

		for (ac = IEEE80211_AC_BK; ac >= IEEE80211_AC_VO; ac--) {
			skb = skb_dequeue(&sta->ps_tx_buf[ac]);
			total += skb_queue_len(&sta->ps_tx_buf[ac]);
			if (skb) {
				purged++;
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				ieee80211_free_txskb(&local->hw, skb);
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				break;
			}
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		}
	}
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	local->total_ps_buffered = total;
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	ps_dbg_hw(&local->hw, "PS buffers full - purged %d frames\n", purged);
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}

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static ieee80211_tx_result
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ieee80211_tx_h_multicast_ps_buf(struct ieee80211_tx_data *tx)
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{
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	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
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	struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
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	struct ps_data *ps;
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	/*
	 * broadcast/multicast frame
	 *
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	 * If any of the associated/peer stations is in power save mode,
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	 * the frame is buffered to be sent after DTIM beacon frame.
	 * This is done either by the hardware or us.
	 */

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	/* powersaving STAs currently only in AP/VLAN/mesh mode */
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	if (tx->sdata->vif.type == NL80211_IFTYPE_AP ||
	    tx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
		if (!tx->sdata->bss)
			return TX_CONTINUE;

		ps = &tx->sdata->bss->ps;
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	} else if (ieee80211_vif_is_mesh(&tx->sdata->vif)) {
		ps = &tx->sdata->u.mesh.ps;
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	} else {
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		return TX_CONTINUE;
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	}

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	/* no buffering for ordered frames */
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	if (ieee80211_has_order(hdr->frame_control))
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		return TX_CONTINUE;
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	/* no stations in PS mode */
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	if (!atomic_read(&ps->num_sta_ps))
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		return TX_CONTINUE;
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	info->flags |= IEEE80211_TX_CTL_SEND_AFTER_DTIM;
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	if (tx->local->hw.flags & IEEE80211_HW_QUEUE_CONTROL)
		info->hw_queue = tx->sdata->vif.cab_queue;
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	/* device releases frame after DTIM beacon */
	if (!(tx->local->hw.flags & IEEE80211_HW_HOST_BROADCAST_PS_BUFFERING))
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		return TX_CONTINUE;

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	/* buffered in mac80211 */
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	if (tx->local->total_ps_buffered >= TOTAL_MAX_TX_BUFFER)
		purge_old_ps_buffers(tx->local);

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	if (skb_queue_len(&ps->bc_buf) >= AP_MAX_BC_BUFFER) {
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		ps_dbg(tx->sdata,
		       "BC TX buffer full - dropping the oldest frame\n");
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		dev_kfree_skb(skb_dequeue(&ps->bc_buf));
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	} else
		tx->local->total_ps_buffered++;
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	skb_queue_tail(&ps->bc_buf, tx->skb);
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	return TX_QUEUED;
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}

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static int ieee80211_use_mfp(__le16 fc, struct sta_info *sta,
			     struct sk_buff *skb)
{
	if (!ieee80211_is_mgmt(fc))
		return 0;

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	if (sta == NULL || !test_sta_flag(sta, WLAN_STA_MFP))
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		return 0;

	if (!ieee80211_is_robust_mgmt_frame((struct ieee80211_hdr *)
					    skb->data))
		return 0;

	return 1;
}

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static ieee80211_tx_result
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ieee80211_tx_h_unicast_ps_buf(struct ieee80211_tx_data *tx)
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{
	struct sta_info *sta = tx->sta;
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	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
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	struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
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	struct ieee80211_local *local = tx->local;
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	if (unlikely(!sta))
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		return TX_CONTINUE;
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	if (unlikely((test_sta_flag(sta, WLAN_STA_PS_STA) ||
		      test_sta_flag(sta, WLAN_STA_PS_DRIVER)) &&
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		     !(info->flags & IEEE80211_TX_CTL_NO_PS_BUFFER))) {
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		int ac = skb_get_queue_mapping(tx->skb);

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		/* only deauth, disassoc and action are bufferable MMPDUs */
		if (ieee80211_is_mgmt(hdr->frame_control) &&
		    !ieee80211_is_deauth(hdr->frame_control) &&
		    !ieee80211_is_disassoc(hdr->frame_control) &&
		    !ieee80211_is_action(hdr->frame_control)) {
			info->flags |= IEEE80211_TX_CTL_NO_PS_BUFFER;
			return TX_CONTINUE;
		}

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		ps_dbg(sta->sdata, "STA %pM aid %d: PS buffer for AC %d\n",
		       sta->sta.addr, sta->sta.aid, ac);
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		if (tx->local->total_ps_buffered >= TOTAL_MAX_TX_BUFFER)
			purge_old_ps_buffers(tx->local);
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		if (skb_queue_len(&sta->ps_tx_buf[ac]) >= STA_MAX_TX_BUFFER) {
			struct sk_buff *old = skb_dequeue(&sta->ps_tx_buf[ac]);
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			ps_dbg(tx->sdata,
			       "STA %pM TX buffer for AC %d full - dropping oldest frame\n",
			       sta->sta.addr, ac);
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			ieee80211_free_txskb(&local->hw, old);
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		} else
			tx->local->total_ps_buffered++;
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		info->control.jiffies = jiffies;
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		info->control.vif = &tx->sdata->vif;
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		info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING;
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		skb_queue_tail(&sta->ps_tx_buf[ac], tx->skb);
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		if (!timer_pending(&local->sta_cleanup))
			mod_timer(&local->sta_cleanup,
				  round_jiffies(jiffies +
						STA_INFO_CLEANUP_INTERVAL));

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		/*
		 * We queued up some frames, so the TIM bit might
		 * need to be set, recalculate it.
		 */
		sta_info_recalc_tim(sta);

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		return TX_QUEUED;
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	} else if (unlikely(test_sta_flag(sta, WLAN_STA_PS_STA))) {
		ps_dbg(tx->sdata,
		       "STA %pM in PS mode, but polling/in SP -> send frame\n",
		       sta->sta.addr);
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	}

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	return TX_CONTINUE;
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}

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static ieee80211_tx_result debug_noinline
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ieee80211_tx_h_ps_buf(struct ieee80211_tx_data *tx)
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{
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	if (unlikely(tx->flags & IEEE80211_TX_PS_BUFFERED))
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		return TX_CONTINUE;
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	if (tx->flags & IEEE80211_TX_UNICAST)
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		return ieee80211_tx_h_unicast_ps_buf(tx);
	else
		return ieee80211_tx_h_multicast_ps_buf(tx);
}

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static ieee80211_tx_result debug_noinline
ieee80211_tx_h_check_control_port_protocol(struct ieee80211_tx_data *tx)
{
	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);

	if (unlikely(tx->sdata->control_port_protocol == tx->skb->protocol &&
		     tx->sdata->control_port_no_encrypt))
		info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;

	return TX_CONTINUE;
}

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static ieee80211_tx_result debug_noinline
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ieee80211_tx_h_select_key(struct ieee80211_tx_data *tx)
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{
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	struct ieee80211_key *key;
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	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
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	struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
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	if (unlikely(info->flags & IEEE80211_TX_INTFL_DONT_ENCRYPT))
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		tx->key = NULL;
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	else if (tx->sta && (key = rcu_dereference(tx->sta->ptk)))
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		tx->key = key;
544
	else if (ieee80211_is_mgmt(hdr->frame_control) &&
545 546
		 is_multicast_ether_addr(hdr->addr1) &&
		 ieee80211_is_robust_mgmt_frame(hdr) &&
547 548
		 (key = rcu_dereference(tx->sdata->default_mgmt_key)))
		tx->key = key;
549 550 551 552 553
	else if (is_multicast_ether_addr(hdr->addr1) &&
		 (key = rcu_dereference(tx->sdata->default_multicast_key)))
		tx->key = key;
	else if (!is_multicast_ether_addr(hdr->addr1) &&
		 (key = rcu_dereference(tx->sdata->default_unicast_key)))
554
		tx->key = key;
555 556 557 558 559 560 561 562 563 564
	else if (info->flags & IEEE80211_TX_CTL_INJECTED)
		tx->key = NULL;
	else if (!tx->sdata->drop_unencrypted)
		tx->key = NULL;
	else if (tx->skb->protocol == tx->sdata->control_port_protocol)
		tx->key = NULL;
	else if (ieee80211_is_robust_mgmt_frame(hdr) &&
		 !(ieee80211_is_action(hdr->frame_control) &&
		   tx->sta && test_sta_flag(tx->sta, WLAN_STA_MFP)))
		tx->key = NULL;
565 566 567
	else if (ieee80211_is_mgmt(hdr->frame_control) &&
		 !ieee80211_is_robust_mgmt_frame(hdr))
		tx->key = NULL;
568
	else {
569
		I802_DEBUG_INC(tx->local->tx_handlers_drop_unencrypted);
570
		return TX_DROP;
571
	}
572 573

	if (tx->key) {
574 575
		bool skip_hw = false;

576
		tx->key->tx_rx_count++;
577
		/* TODO: add threshold stuff again */
578

579 580 581 582
		switch (tx->key->conf.cipher) {
		case WLAN_CIPHER_SUITE_WEP40:
		case WLAN_CIPHER_SUITE_WEP104:
		case WLAN_CIPHER_SUITE_TKIP:
583
			if (!ieee80211_is_data_present(hdr->frame_control))
584 585
				tx->key = NULL;
			break;
586
		case WLAN_CIPHER_SUITE_CCMP:
587 588 589 590
			if (!ieee80211_is_data_present(hdr->frame_control) &&
			    !ieee80211_use_mfp(hdr->frame_control, tx->sta,
					       tx->skb))
				tx->key = NULL;
591 592
			else
				skip_hw = (tx->key->conf.flags &
593
					   IEEE80211_KEY_FLAG_SW_MGMT_TX) &&
594
					ieee80211_is_mgmt(hdr->frame_control);
595
			break;
596
		case WLAN_CIPHER_SUITE_AES_CMAC:
597 598 599
			if (!ieee80211_is_mgmt(hdr->frame_control))
				tx->key = NULL;
			break;
600
		}
601

602 603
		if (unlikely(tx->key && tx->key->flags & KEY_FLAG_TAINTED &&
			     !ieee80211_is_deauth(hdr->frame_control)))
604 605
			return TX_DROP;

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606
		if (!skip_hw && tx->key &&
J
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607
		    tx->key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE)
608
			info->control.hw_key = &tx->key->conf;
609 610
	}

611
	return TX_CONTINUE;
612 613
}

614
static ieee80211_tx_result debug_noinline
615
ieee80211_tx_h_rate_ctrl(struct ieee80211_tx_data *tx)
616
{
617
	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
618 619 620
	struct ieee80211_hdr *hdr = (void *)tx->skb->data;
	struct ieee80211_supported_band *sband;
	struct ieee80211_rate *rate;
S
Shanyu Zhao 已提交
621 622
	int i;
	u32 len;
623 624
	bool inval = false, rts = false, short_preamble = false;
	struct ieee80211_tx_rate_control txrc;
J
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625
	bool assoc = false;
626

627
	memset(&txrc, 0, sizeof(txrc));
628

629
	sband = tx->local->hw.wiphy->bands[info->band];
630

S
Shanyu Zhao 已提交
631
	len = min_t(u32, tx->skb->len + FCS_LEN,
632
			 tx->local->hw.wiphy->frag_threshold);
633 634

	/* set up the tx rate control struct we give the RC algo */
J
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635
	txrc.hw = &tx->local->hw;
636 637 638 639
	txrc.sband = sband;
	txrc.bss_conf = &tx->sdata->vif.bss_conf;
	txrc.skb = tx->skb;
	txrc.reported_rate.idx = -1;
640
	txrc.rate_idx_mask = tx->sdata->rc_rateidx_mask[info->band];
641 642 643 644
	if (txrc.rate_idx_mask == (1 << sband->n_bitrates) - 1)
		txrc.max_rate_idx = -1;
	else
		txrc.max_rate_idx = fls(txrc.rate_idx_mask) - 1;
645
	memcpy(txrc.rate_idx_mcs_mask,
646
	       tx->sdata->rc_rateidx_mcs_mask[info->band],
647
	       sizeof(txrc.rate_idx_mcs_mask));
648
	txrc.bss = (tx->sdata->vif.type == NL80211_IFTYPE_AP ||
649
		    tx->sdata->vif.type == NL80211_IFTYPE_MESH_POINT ||
650
		    tx->sdata->vif.type == NL80211_IFTYPE_ADHOC);
651 652

	/* set up RTS protection if desired */
653
	if (len > tx->local->hw.wiphy->rts_threshold) {
654
		txrc.rts = rts = true;
655 656
	}

657 658 659 660 661 662 663 664
	/*
	 * Use short preamble if the BSS can handle it, but not for
	 * management frames unless we know the receiver can handle
	 * that -- the management frame might be to a station that
	 * just wants a probe response.
	 */
	if (tx->sdata->vif.bss_conf.use_short_preamble &&
	    (ieee80211_is_data(hdr->frame_control) ||
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665
	     (tx->sta && test_sta_flag(tx->sta, WLAN_STA_SHORT_PREAMBLE))))
666
		txrc.short_preamble = short_preamble = true;
667

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668 669
	if (tx->sta)
		assoc = test_sta_flag(tx->sta, WLAN_STA_ASSOC);
670 671 672 673 674

	/*
	 * Lets not bother rate control if we're associated and cannot
	 * talk to the sta. This should not happen.
	 */
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675
	if (WARN(test_bit(SCAN_SW_SCANNING, &tx->local->scanning) && assoc &&
676 677 678 679
		 !rate_usable_index_exists(sband, &tx->sta->sta),
		 "%s: Dropped data frame as no usable bitrate found while "
		 "scanning and associated. Target station: "
		 "%pM on %d GHz band\n",
680
		 tx->sdata->name, hdr->addr1,
681
		 info->band ? 5 : 2))
682
		return TX_DROP;
683

684 685 686 687
	/*
	 * If we're associated with the sta at this point we know we can at
	 * least send the frame at the lowest bit rate.
	 */
688 689 690 691 692
	rate_control_get_rate(tx->sdata, tx->sta, &txrc);

	if (unlikely(info->control.rates[0].idx < 0))
		return TX_DROP;

693
	if (txrc.reported_rate.idx < 0) {
694
		txrc.reported_rate = info->control.rates[0];
695 696 697
		if (tx->sta && ieee80211_is_data(hdr->frame_control))
			tx->sta->last_tx_rate = txrc.reported_rate;
	} else if (tx->sta)
698
		tx->sta->last_tx_rate = txrc.reported_rate;
699

700 701
	if (unlikely(!info->control.rates[0].count))
		info->control.rates[0].count = 1;
702

703 704 705 706
	if (WARN_ON_ONCE((info->control.rates[0].count > 1) &&
			 (info->flags & IEEE80211_TX_CTL_NO_ACK)))
		info->control.rates[0].count = 1;

707 708 709 710 711
	if (is_multicast_ether_addr(hdr->addr1)) {
		/*
		 * XXX: verify the rate is in the basic rateset
		 */
		return TX_CONTINUE;
712 713
	}

714 715 716 717 718 719 720 721 722 723 724 725 726 727 728 729 730 731 732 733 734 735 736 737 738
	/*
	 * set up the RTS/CTS rate as the fastest basic rate
	 * that is not faster than the data rate
	 *
	 * XXX: Should this check all retry rates?
	 */
	if (!(info->control.rates[0].flags & IEEE80211_TX_RC_MCS)) {
		s8 baserate = 0;

		rate = &sband->bitrates[info->control.rates[0].idx];

		for (i = 0; i < sband->n_bitrates; i++) {
			/* must be a basic rate */
			if (!(tx->sdata->vif.bss_conf.basic_rates & BIT(i)))
				continue;
			/* must not be faster than the data rate */
			if (sband->bitrates[i].bitrate > rate->bitrate)
				continue;
			/* maximum */
			if (sband->bitrates[baserate].bitrate <
			     sband->bitrates[i].bitrate)
				baserate = i;
		}

		info->control.rts_cts_rate_idx = baserate;
739 740
	}

741 742 743 744 745 746 747 748 749 750 751 752 753 754
	for (i = 0; i < IEEE80211_TX_MAX_RATES; i++) {
		/*
		 * make sure there's no valid rate following
		 * an invalid one, just in case drivers don't
		 * take the API seriously to stop at -1.
		 */
		if (inval) {
			info->control.rates[i].idx = -1;
			continue;
		}
		if (info->control.rates[i].idx < 0) {
			inval = true;
			continue;
		}
755

756 757 758 759 760 761 762 763
		/*
		 * For now assume MCS is already set up correctly, this
		 * needs to be fixed.
		 */
		if (info->control.rates[i].flags & IEEE80211_TX_RC_MCS) {
			WARN_ON(info->control.rates[i].idx > 76);
			continue;
		}
764

765 766 767 768
		/* set up RTS protection if desired */
		if (rts)
			info->control.rates[i].flags |=
				IEEE80211_TX_RC_USE_RTS_CTS;
769

770
		/* RC is busted */
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Sujith 已提交
771 772
		if (WARN_ON_ONCE(info->control.rates[i].idx >=
				 sband->n_bitrates)) {
773 774
			info->control.rates[i].idx = -1;
			continue;
775
		}
776

777 778 779 780 781 782 783 784 785 786 787 788 789
		rate = &sband->bitrates[info->control.rates[i].idx];

		/* set up short preamble */
		if (short_preamble &&
		    rate->flags & IEEE80211_RATE_SHORT_PREAMBLE)
			info->control.rates[i].flags |=
				IEEE80211_TX_RC_USE_SHORT_PREAMBLE;

		/* set up G protection */
		if (!rts && tx->sdata->vif.bss_conf.use_cts_prot &&
		    rate->flags & IEEE80211_RATE_ERP_G)
			info->control.rates[i].flags |=
				IEEE80211_TX_RC_USE_CTS_PROTECT;
790 791
	}

792 793 794
	return TX_CONTINUE;
}

795 796 797 798 799 800 801 802 803
static ieee80211_tx_result debug_noinline
ieee80211_tx_h_sequence(struct ieee80211_tx_data *tx)
{
	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
	struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
	u16 *seq;
	u8 *qc;
	int tid;

804 805 806 807 808
	/*
	 * Packet injection may want to control the sequence
	 * number, if we have no matching interface then we
	 * neither assign one ourselves nor ask the driver to.
	 */
809
	if (unlikely(info->control.vif->type == NL80211_IFTYPE_MONITOR))
810 811
		return TX_CONTINUE;

812 813 814 815 816 817
	if (unlikely(ieee80211_is_ctl(hdr->frame_control)))
		return TX_CONTINUE;

	if (ieee80211_hdrlen(hdr->frame_control) < 24)
		return TX_CONTINUE;

818 819 820
	if (ieee80211_is_qos_nullfunc(hdr->frame_control))
		return TX_CONTINUE;

J
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821 822 823 824 825
	/*
	 * Anything but QoS data that has a sequence number field
	 * (is long enough) gets a sequence number from the global
	 * counter.
	 */
826
	if (!ieee80211_is_data_qos(hdr->frame_control)) {
J
Johannes Berg 已提交
827
		/* driver should assign sequence number */
828
		info->flags |= IEEE80211_TX_CTL_ASSIGN_SEQ;
J
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829 830 831
		/* for pure STA mode without beacons, we can do it */
		hdr->seq_ctrl = cpu_to_le16(tx->sdata->sequence_number);
		tx->sdata->sequence_number += 0x10;
832 833 834 835 836 837 838 839 840 841 842 843 844 845 846 847 848 849 850 851 852 853 854 855 856
		return TX_CONTINUE;
	}

	/*
	 * This should be true for injected/management frames only, for
	 * management frames we have set the IEEE80211_TX_CTL_ASSIGN_SEQ
	 * above since they are not QoS-data frames.
	 */
	if (!tx->sta)
		return TX_CONTINUE;

	/* include per-STA, per-TID sequence counter */

	qc = ieee80211_get_qos_ctl(hdr);
	tid = *qc & IEEE80211_QOS_CTL_TID_MASK;
	seq = &tx->sta->tid_seq[tid];

	hdr->seq_ctrl = cpu_to_le16(*seq);

	/* Increase the sequence number. */
	*seq = (*seq + 0x10) & IEEE80211_SCTL_SEQ;

	return TX_CONTINUE;
}

857
static int ieee80211_fragment(struct ieee80211_tx_data *tx,
J
Johannes Berg 已提交
858 859 860
			      struct sk_buff *skb, int hdrlen,
			      int frag_threshold)
{
861
	struct ieee80211_local *local = tx->local;
862
	struct ieee80211_tx_info *info;
863
	struct sk_buff *tmp;
J
Johannes Berg 已提交
864 865 866 867 868 869 870
	int per_fragm = frag_threshold - hdrlen - FCS_LEN;
	int pos = hdrlen + per_fragm;
	int rem = skb->len - hdrlen - per_fragm;

	if (WARN_ON(rem < 0))
		return -EINVAL;

871 872
	/* first fragment was already added to queue by caller */

J
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873 874 875 876 877 878 879 880 881 882 883 884
	while (rem) {
		int fraglen = per_fragm;

		if (fraglen > rem)
			fraglen = rem;
		rem -= fraglen;
		tmp = dev_alloc_skb(local->tx_headroom +
				    frag_threshold +
				    IEEE80211_ENCRYPT_HEADROOM +
				    IEEE80211_ENCRYPT_TAILROOM);
		if (!tmp)
			return -ENOMEM;
885 886 887

		__skb_queue_tail(&tx->skbs, tmp);

J
Johannes Berg 已提交
888 889 890 891
		skb_reserve(tmp, local->tx_headroom +
				 IEEE80211_ENCRYPT_HEADROOM);
		/* copy control information */
		memcpy(tmp->cb, skb->cb, sizeof(tmp->cb));
892 893 894 895 896 897 898 899

		info = IEEE80211_SKB_CB(tmp);
		info->flags &= ~(IEEE80211_TX_CTL_CLEAR_PS_FILT |
				 IEEE80211_TX_CTL_FIRST_FRAGMENT);

		if (rem)
			info->flags |= IEEE80211_TX_CTL_MORE_FRAMES;

J
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900 901 902 903 904 905 906 907 908 909 910
		skb_copy_queue_mapping(tmp, skb);
		tmp->priority = skb->priority;
		tmp->dev = skb->dev;

		/* copy header and data */
		memcpy(skb_put(tmp, hdrlen), skb->data, hdrlen);
		memcpy(skb_put(tmp, fraglen), skb->data + pos, fraglen);

		pos += fraglen;
	}

911
	/* adjust first fragment's length */
J
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912 913 914 915
	skb->len = hdrlen + per_fragm;
	return 0;
}

916
static ieee80211_tx_result debug_noinline
917 918
ieee80211_tx_h_fragment(struct ieee80211_tx_data *tx)
{
J
Johannes Berg 已提交
919 920 921
	struct sk_buff *skb = tx->skb;
	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
	struct ieee80211_hdr *hdr = (void *)skb->data;
922
	int frag_threshold = tx->local->hw.wiphy->frag_threshold;
J
Johannes Berg 已提交
923 924
	int hdrlen;
	int fragnum;
925

926 927 928 929
	/* no matter what happens, tx->skb moves to tx->skbs */
	__skb_queue_tail(&tx->skbs, skb);
	tx->skb = NULL;

930 931 932 933
	if (info->flags & IEEE80211_TX_CTL_DONTFRAG)
		return TX_CONTINUE;

	if (tx->local->ops->set_frag_threshold)
934 935
		return TX_CONTINUE;

936 937
	/*
	 * Warn when submitting a fragmented A-MPDU frame and drop it.
J
Johannes Berg 已提交
938
	 * This scenario is handled in ieee80211_tx_prepare but extra
939
	 * caution taken here as fragmented ampdu may cause Tx stop.
940
	 */
S
Sujith 已提交
941
	if (WARN_ON(info->flags & IEEE80211_TX_CTL_AMPDU))
942 943
		return TX_DROP;

944
	hdrlen = ieee80211_hdrlen(hdr->frame_control);
945

946
	/* internal error, why isn't DONTFRAG set? */
947
	if (WARN_ON(skb->len + FCS_LEN <= frag_threshold))
J
Johannes Berg 已提交
948
		return TX_DROP;
949

J
Johannes Berg 已提交
950 951 952 953 954 955 956 957
	/*
	 * Now fragment the frame. This will allocate all the fragments and
	 * chain them (using skb as the first fragment) to skb->next.
	 * During transmission, we will remove the successfully transmitted
	 * fragments from this list. When the low-level driver rejects one
	 * of the fragments then we will simply pretend to accept the skb
	 * but store it away as pending.
	 */
958
	if (ieee80211_fragment(tx, skb, hdrlen, frag_threshold))
J
Johannes Berg 已提交
959
		return TX_DROP;
960

J
Johannes Berg 已提交
961 962
	/* update duration/seq/flags of fragments */
	fragnum = 0;
963 964

	skb_queue_walk(&tx->skbs, skb) {
J
Johannes Berg 已提交
965
		const __le16 morefrags = cpu_to_le16(IEEE80211_FCTL_MOREFRAGS);
966

J
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967 968
		hdr = (void *)skb->data;
		info = IEEE80211_SKB_CB(skb);
969

970
		if (!skb_queue_is_last(&tx->skbs, skb)) {
J
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971
			hdr->frame_control |= morefrags;
972 973 974 975 976 977 978
			/*
			 * No multi-rate retries for fragmented frames, that
			 * would completely throw off the NAV at other STAs.
			 */
			info->control.rates[1].idx = -1;
			info->control.rates[2].idx = -1;
			info->control.rates[3].idx = -1;
979
			BUILD_BUG_ON(IEEE80211_TX_MAX_RATES != 4);
980
			info->flags &= ~IEEE80211_TX_CTL_RATE_CTRL_PROBE;
J
Johannes Berg 已提交
981 982
		} else {
			hdr->frame_control &= ~morefrags;
983
		}
J
Johannes Berg 已提交
984 985
		hdr->seq_ctrl |= cpu_to_le16(fragnum & IEEE80211_SCTL_FRAG);
		fragnum++;
986
	}
987

988
	return TX_CONTINUE;
989 990
}

991 992 993
static ieee80211_tx_result debug_noinline
ieee80211_tx_h_stats(struct ieee80211_tx_data *tx)
{
994
	struct sk_buff *skb;
995
	int ac = -1;
996 997 998 999

	if (!tx->sta)
		return TX_CONTINUE;

1000
	skb_queue_walk(&tx->skbs, skb) {
1001
		ac = skb_get_queue_mapping(skb);
1002
		tx->sta->tx_fragments++;
1003
		tx->sta->tx_bytes[ac] += skb->len;
1004
	}
1005 1006
	if (ac >= 0)
		tx->sta->tx_packets[ac]++;
1007 1008 1009 1010

	return TX_CONTINUE;
}

1011
static ieee80211_tx_result debug_noinline
1012 1013 1014 1015 1016
ieee80211_tx_h_encrypt(struct ieee80211_tx_data *tx)
{
	if (!tx->key)
		return TX_CONTINUE;

1017 1018 1019
	switch (tx->key->conf.cipher) {
	case WLAN_CIPHER_SUITE_WEP40:
	case WLAN_CIPHER_SUITE_WEP104:
1020
		return ieee80211_crypto_wep_encrypt(tx);
1021
	case WLAN_CIPHER_SUITE_TKIP:
1022
		return ieee80211_crypto_tkip_encrypt(tx);
1023
	case WLAN_CIPHER_SUITE_CCMP:
1024
		return ieee80211_crypto_ccmp_encrypt(tx);
1025
	case WLAN_CIPHER_SUITE_AES_CMAC:
1026
		return ieee80211_crypto_aes_cmac_encrypt(tx);
1027
	default:
1028
		return ieee80211_crypto_hw_encrypt(tx);
1029 1030 1031 1032 1033
	}

	return TX_DROP;
}

1034
static ieee80211_tx_result debug_noinline
J
Johannes Berg 已提交
1035 1036
ieee80211_tx_h_calculate_duration(struct ieee80211_tx_data *tx)
{
1037
	struct sk_buff *skb;
J
Johannes Berg 已提交
1038 1039 1040
	struct ieee80211_hdr *hdr;
	int next_len;
	bool group_addr;
J
Johannes Berg 已提交
1041

1042
	skb_queue_walk(&tx->skbs, skb) {
J
Johannes Berg 已提交
1043
		hdr = (void *) skb->data;
1044 1045
		if (unlikely(ieee80211_is_pspoll(hdr->frame_control)))
			break; /* must not overwrite AID */
1046 1047 1048 1049 1050
		if (!skb_queue_is_last(&tx->skbs, skb)) {
			struct sk_buff *next = skb_queue_next(&tx->skbs, skb);
			next_len = next->len;
		} else
			next_len = 0;
J
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1051
		group_addr = is_multicast_ether_addr(hdr->addr1);
J
Johannes Berg 已提交
1052

J
Johannes Berg 已提交
1053
		hdr->duration_id =
1054 1055
			ieee80211_duration(tx, skb, group_addr, next_len);
	}
J
Johannes Berg 已提交
1056 1057 1058 1059

	return TX_CONTINUE;
}

1060 1061
/* actual transmit path */

1062 1063 1064 1065 1066 1067 1068
static bool ieee80211_tx_prep_agg(struct ieee80211_tx_data *tx,
				  struct sk_buff *skb,
				  struct ieee80211_tx_info *info,
				  struct tid_ampdu_tx *tid_tx,
				  int tid)
{
	bool queued = false;
1069
	bool reset_agg_timer = false;
1070
	struct sk_buff *purge_skb = NULL;
1071 1072 1073

	if (test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state)) {
		info->flags |= IEEE80211_TX_CTL_AMPDU;
1074
		reset_agg_timer = true;
1075 1076 1077 1078 1079
	} else if (test_bit(HT_AGG_STATE_WANT_START, &tid_tx->state)) {
		/*
		 * nothing -- this aggregation session is being started
		 * but that might still fail with the driver
		 */
1080 1081 1082 1083 1084 1085 1086 1087 1088 1089 1090 1091 1092 1093 1094 1095 1096 1097 1098 1099
	} else {
		spin_lock(&tx->sta->lock);
		/*
		 * Need to re-check now, because we may get here
		 *
		 *  1) in the window during which the setup is actually
		 *     already done, but not marked yet because not all
		 *     packets are spliced over to the driver pending
		 *     queue yet -- if this happened we acquire the lock
		 *     either before or after the splice happens, but
		 *     need to recheck which of these cases happened.
		 *
		 *  2) during session teardown, if the OPERATIONAL bit
		 *     was cleared due to the teardown but the pointer
		 *     hasn't been assigned NULL yet (or we loaded it
		 *     before it was assigned) -- in this case it may
		 *     now be NULL which means we should just let the
		 *     packet pass through because splicing the frames
		 *     back is already done.
		 */
J
Johannes Berg 已提交
1100
		tid_tx = rcu_dereference_protected_tid_tx(tx->sta, tid);
1101 1102 1103 1104 1105

		if (!tid_tx) {
			/* do nothing, let packet pass through */
		} else if (test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state)) {
			info->flags |= IEEE80211_TX_CTL_AMPDU;
1106
			reset_agg_timer = true;
1107 1108 1109 1110 1111
		} else {
			queued = true;
			info->control.vif = &tx->sdata->vif;
			info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING;
			__skb_queue_tail(&tid_tx->pending, skb);
1112 1113
			if (skb_queue_len(&tid_tx->pending) > STA_MAX_TX_BUFFER)
				purge_skb = __skb_dequeue(&tid_tx->pending);
1114 1115
		}
		spin_unlock(&tx->sta->lock);
1116 1117

		if (purge_skb)
1118
			ieee80211_free_txskb(&tx->local->hw, purge_skb);
1119 1120
	}

1121 1122
	/* reset session timer */
	if (reset_agg_timer && tid_tx->timeout)
1123
		tid_tx->last_tx = jiffies;
1124

1125 1126 1127
	return queued;
}

1128 1129 1130
/*
 * initialises @tx
 */
1131
static ieee80211_tx_result
J
Johannes Berg 已提交
1132 1133 1134
ieee80211_tx_prepare(struct ieee80211_sub_if_data *sdata,
		     struct ieee80211_tx_data *tx,
		     struct sk_buff *skb)
1135
{
J
Johannes Berg 已提交
1136
	struct ieee80211_local *local = sdata->local;
1137
	struct ieee80211_hdr *hdr;
1138
	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
J
Johannes Berg 已提交
1139
	int tid;
1140
	u8 *qc;
1141 1142 1143 1144

	memset(tx, 0, sizeof(*tx));
	tx->skb = skb;
	tx->local = local;
J
Johannes Berg 已提交
1145
	tx->sdata = sdata;
1146
	__skb_queue_head_init(&tx->skbs);
1147

1148 1149 1150 1151 1152 1153 1154
	/*
	 * If this flag is set to true anywhere, and we get here,
	 * we are doing the needed processing, so remove the flag
	 * now.
	 */
	info->flags &= ~IEEE80211_TX_INTFL_NEED_TXPROCESSING;

1155 1156
	hdr = (struct ieee80211_hdr *) skb->data;

1157
	if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
1158
		tx->sta = rcu_dereference(sdata->u.vlan.sta);
1159 1160
		if (!tx->sta && sdata->dev->ieee80211_ptr->use_4addr)
			return TX_DROP;
1161 1162
	} else if (info->flags & IEEE80211_TX_CTL_INJECTED ||
		   tx->sdata->control_port_protocol == tx->skb->protocol) {
1163
		tx->sta = sta_info_get_bss(sdata, hdr->addr1);
1164
	}
1165
	if (!tx->sta)
1166
		tx->sta = sta_info_get(sdata, hdr->addr1);
1167

1168
	if (tx->sta && ieee80211_is_data_qos(hdr->frame_control) &&
1169
	    !ieee80211_is_qos_nullfunc(hdr->frame_control) &&
1170 1171
	    (local->hw.flags & IEEE80211_HW_AMPDU_AGGREGATION) &&
	    !(local->hw.flags & IEEE80211_HW_TX_AMPDU_SETUP_IN_HW)) {
1172 1173
		struct tid_ampdu_tx *tid_tx;

S
Sujith 已提交
1174 1175 1176
		qc = ieee80211_get_qos_ctl(hdr);
		tid = *qc & IEEE80211_QOS_CTL_TID_MASK;

1177 1178 1179
		tid_tx = rcu_dereference(tx->sta->ampdu_mlme.tid_tx[tid]);
		if (tid_tx) {
			bool queued;
1180

1181 1182 1183 1184 1185 1186
			queued = ieee80211_tx_prep_agg(tx, skb, info,
						       tid_tx, tid);

			if (unlikely(queued))
				return TX_QUEUED;
		}
S
Sujith 已提交
1187 1188
	}

1189
	if (is_multicast_ether_addr(hdr->addr1)) {
1190
		tx->flags &= ~IEEE80211_TX_UNICAST;
1191
		info->flags |= IEEE80211_TX_CTL_NO_ACK;
1192
	} else
1193
		tx->flags |= IEEE80211_TX_UNICAST;
1194

1195 1196 1197 1198 1199
	if (!(info->flags & IEEE80211_TX_CTL_DONTFRAG)) {
		if (!(tx->flags & IEEE80211_TX_UNICAST) ||
		    skb->len + FCS_LEN <= local->hw.wiphy->frag_threshold ||
		    info->flags & IEEE80211_TX_CTL_AMPDU)
			info->flags |= IEEE80211_TX_CTL_DONTFRAG;
1200 1201
	}

1202
	if (!tx->sta)
1203
		info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT;
J
Johannes Berg 已提交
1204
	else if (test_and_clear_sta_flag(tx->sta, WLAN_STA_CLEAR_PS_FILT))
1205
		info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT;
1206

1207
	info->flags |= IEEE80211_TX_CTL_FIRST_FRAGMENT;
1208

1209
	return TX_CONTINUE;
1210 1211
}

1212 1213 1214 1215 1216
static bool ieee80211_tx_frags(struct ieee80211_local *local,
			       struct ieee80211_vif *vif,
			       struct ieee80211_sta *sta,
			       struct sk_buff_head *skbs,
			       bool txpending)
1217
{
1218
	struct ieee80211_tx_control control;
1219
	struct sk_buff *skb, *tmp;
J
Johannes Berg 已提交
1220
	unsigned long flags;
1221

1222
	skb_queue_walk_safe(skbs, skb, tmp) {
1223 1224 1225 1226 1227 1228
		struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
		int q = info->hw_queue;

#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
		if (WARN_ON_ONCE(q >= local->hw.queues)) {
			__skb_unlink(skb, skbs);
1229
			ieee80211_free_txskb(&local->hw, skb);
1230 1231 1232
			continue;
		}
#endif
J
Johannes Berg 已提交
1233 1234 1235

		spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
		if (local->queue_stop_reasons[q] ||
1236
		    (!txpending && !skb_queue_empty(&local->pending[q]))) {
1237
			if (unlikely(info->flags &
1238 1239 1240 1241 1242 1243 1244 1245 1246 1247 1248 1249 1250 1251 1252 1253 1254 1255
				     IEEE80211_TX_INTFL_OFFCHAN_TX_OK)) {
				if (local->queue_stop_reasons[q] &
				    ~BIT(IEEE80211_QUEUE_STOP_REASON_OFFCHANNEL)) {
					/*
					 * Drop off-channel frames if queues
					 * are stopped for any reason other
					 * than off-channel operation. Never
					 * queue them.
					 */
					spin_unlock_irqrestore(
						&local->queue_stop_reason_lock,
						flags);
					ieee80211_purge_tx_queue(&local->hw,
								 skbs);
					return true;
				}
			} else {

1256
				/*
1257 1258 1259
				 * Since queue is stopped, queue up frames for
				 * later transmission from the tx-pending
				 * tasklet when the queue is woken again.
1260
				 */
1261 1262 1263 1264 1265 1266 1267 1268 1269 1270
				if (txpending)
					skb_queue_splice_init(skbs,
							      &local->pending[q]);
				else
					skb_queue_splice_tail_init(skbs,
								   &local->pending[q]);

				spin_unlock_irqrestore(&local->queue_stop_reason_lock,
						       flags);
				return false;
1271
			}
1272
		}
J
Johannes Berg 已提交
1273
		spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
1274

1275
		info->control.vif = vif;
1276
		control.sta = sta;
1277

1278
		__skb_unlink(skb, skbs);
1279
		drv_tx(local, &control, skb);
1280
	}
1281

1282 1283 1284 1285 1286 1287 1288 1289 1290 1291 1292 1293 1294 1295 1296 1297 1298
	return true;
}

/*
 * Returns false if the frame couldn't be transmitted but was queued instead.
 */
static bool __ieee80211_tx(struct ieee80211_local *local,
			   struct sk_buff_head *skbs, int led_len,
			   struct sta_info *sta, bool txpending)
{
	struct ieee80211_tx_info *info;
	struct ieee80211_sub_if_data *sdata;
	struct ieee80211_vif *vif;
	struct ieee80211_sta *pubsta;
	struct sk_buff *skb;
	bool result = true;
	__le16 fc;
1299

1300 1301
	if (WARN_ON(skb_queue_empty(skbs)))
		return true;
J
Johannes Berg 已提交
1302

1303 1304 1305 1306 1307 1308 1309 1310 1311 1312 1313 1314 1315 1316
	skb = skb_peek(skbs);
	fc = ((struct ieee80211_hdr *)skb->data)->frame_control;
	info = IEEE80211_SKB_CB(skb);
	sdata = vif_to_sdata(info->control.vif);
	if (sta && !sta->uploaded)
		sta = NULL;

	if (sta)
		pubsta = &sta->sta;
	else
		pubsta = NULL;

	switch (sdata->vif.type) {
	case NL80211_IFTYPE_MONITOR:
1317
		sdata = rcu_dereference(local->monitor_sdata);
1318
		if (sdata) {
1319
			vif = &sdata->vif;
1320 1321 1322 1323 1324 1325
			info->hw_queue =
				vif->hw_queue[skb_get_queue_mapping(skb)];
		} else if (local->hw.flags & IEEE80211_HW_QUEUE_CONTROL) {
			dev_kfree_skb(skb);
			return true;
		} else
1326
			vif = NULL;
1327 1328 1329 1330 1331 1332 1333 1334
		break;
	case NL80211_IFTYPE_AP_VLAN:
		sdata = container_of(sdata->bss,
				     struct ieee80211_sub_if_data, u.ap);
		/* fall through */
	default:
		vif = &sdata->vif;
		break;
1335
	}
J
Johannes Berg 已提交
1336

1337 1338
	result = ieee80211_tx_frags(local, vif, pubsta, skbs,
				    txpending);
1339

1340 1341 1342
	ieee80211_tpt_led_trig_tx(local, fc, led_len);
	ieee80211_led_tx(local, 1);

J
Johannes Berg 已提交
1343
	WARN_ON_ONCE(!skb_queue_empty(skbs));
1344

1345
	return result;
1346 1347
}

1348 1349 1350 1351 1352 1353
/*
 * Invoke TX handlers, return 0 on success and non-zero if the
 * frame was dropped or queued.
 */
static int invoke_tx_handlers(struct ieee80211_tx_data *tx)
{
1354
	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
1355 1356
	ieee80211_tx_result res = TX_DROP;

1357 1358 1359 1360 1361 1362 1363
#define CALL_TXH(txh) \
	do {				\
		res = txh(tx);		\
		if (res != TX_CONTINUE)	\
			goto txh_done;	\
	} while (0)

1364
	CALL_TXH(ieee80211_tx_h_dynamic_ps);
1365 1366
	CALL_TXH(ieee80211_tx_h_check_assoc);
	CALL_TXH(ieee80211_tx_h_ps_buf);
1367
	CALL_TXH(ieee80211_tx_h_check_control_port_protocol);
1368
	CALL_TXH(ieee80211_tx_h_select_key);
1369 1370
	if (!(tx->local->hw.flags & IEEE80211_HW_HAS_RATE_CONTROL))
		CALL_TXH(ieee80211_tx_h_rate_ctrl);
1371

J
Johannes Berg 已提交
1372 1373 1374
	if (unlikely(info->flags & IEEE80211_TX_INTFL_RETRANSMISSION)) {
		__skb_queue_tail(&tx->skbs, tx->skb);
		tx->skb = NULL;
1375
		goto txh_done;
J
Johannes Berg 已提交
1376
	}
1377 1378

	CALL_TXH(ieee80211_tx_h_michael_mic_add);
1379 1380
	CALL_TXH(ieee80211_tx_h_sequence);
	CALL_TXH(ieee80211_tx_h_fragment);
1381
	/* handlers after fragment must be aware of tx info fragmentation! */
1382 1383
	CALL_TXH(ieee80211_tx_h_stats);
	CALL_TXH(ieee80211_tx_h_encrypt);
1384 1385
	if (!(tx->local->hw.flags & IEEE80211_HW_HAS_RATE_CONTROL))
		CALL_TXH(ieee80211_tx_h_calculate_duration);
1386
#undef CALL_TXH
1387

1388
 txh_done:
1389
	if (unlikely(res == TX_DROP)) {
1390
		I802_DEBUG_INC(tx->local->tx_handlers_drop);
1391
		if (tx->skb)
1392
			ieee80211_free_txskb(&tx->local->hw, tx->skb);
1393
		else
1394
			ieee80211_purge_tx_queue(&tx->local->hw, &tx->skbs);
1395 1396
		return -1;
	} else if (unlikely(res == TX_QUEUED)) {
1397
		I802_DEBUG_INC(tx->local->tx_handlers_queued);
1398 1399 1400 1401 1402 1403
		return -1;
	}

	return 0;
}

1404 1405 1406 1407
/*
 * Returns false if the frame couldn't be transmitted but was queued instead.
 */
static bool ieee80211_tx(struct ieee80211_sub_if_data *sdata,
J
Johannes Berg 已提交
1408 1409
			 struct sk_buff *skb, bool txpending,
			 enum ieee80211_band band)
1410
{
J
Johannes Berg 已提交
1411
	struct ieee80211_local *local = sdata->local;
1412
	struct ieee80211_tx_data tx;
1413
	ieee80211_tx_result res_prepare;
1414
	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1415
	bool result = true;
1416
	int led_len;
1417 1418 1419

	if (unlikely(skb->len < 10)) {
		dev_kfree_skb(skb);
1420
		return true;
1421 1422
	}

1423
	/* initialises tx */
1424
	led_len = skb->len;
J
Johannes Berg 已提交
1425
	res_prepare = ieee80211_tx_prepare(sdata, &tx, skb);
1426

1427
	if (unlikely(res_prepare == TX_DROP)) {
1428
		ieee80211_free_txskb(&local->hw, skb);
J
Johannes Berg 已提交
1429
		return true;
1430
	} else if (unlikely(res_prepare == TX_QUEUED)) {
J
Johannes Berg 已提交
1431
		return true;
1432 1433
	}

J
Johannes Berg 已提交
1434
	info->band = band;
1435

1436 1437 1438 1439 1440 1441
	/* set up hw_queue value early */
	if (!(info->flags & IEEE80211_TX_CTL_TX_OFFCHAN) ||
	    !(local->hw.flags & IEEE80211_HW_QUEUE_CONTROL))
		info->hw_queue =
			sdata->vif.hw_queue[skb_get_queue_mapping(skb)];

1442
	if (!invoke_tx_handlers(&tx))
1443 1444
		result = __ieee80211_tx(local, &tx.skbs, led_len,
					tx.sta, txpending);
J
Johannes Berg 已提交
1445

1446
	return result;
1447 1448 1449 1450
}

/* device xmit handlers */

1451
static int ieee80211_skb_resize(struct ieee80211_sub_if_data *sdata,
1452 1453 1454
				struct sk_buff *skb,
				int head_need, bool may_encrypt)
{
1455
	struct ieee80211_local *local = sdata->local;
1456 1457
	int tail_need = 0;

1458
	if (may_encrypt && sdata->crypto_tx_tailroom_needed_cnt) {
1459 1460 1461 1462 1463
		tail_need = IEEE80211_ENCRYPT_TAILROOM;
		tail_need -= skb_tailroom(skb);
		tail_need = max_t(int, tail_need, 0);
	}

1464
	if (skb_cloned(skb))
1465
		I802_DEBUG_INC(local->tx_expand_skb_head_cloned);
1466
	else if (head_need || tail_need)
1467
		I802_DEBUG_INC(local->tx_expand_skb_head);
1468 1469
	else
		return 0;
1470 1471

	if (pskb_expand_head(skb, head_need, tail_need, GFP_ATOMIC)) {
J
Joe Perches 已提交
1472 1473
		wiphy_debug(local->hw.wiphy,
			    "failed to reallocate TX buffer\n");
1474 1475 1476 1477 1478 1479
		return -ENOMEM;
	}

	return 0;
}

J
Johannes Berg 已提交
1480 1481
void ieee80211_xmit(struct ieee80211_sub_if_data *sdata, struct sk_buff *skb,
		    enum ieee80211_band band)
1482
{
J
Johannes Berg 已提交
1483
	struct ieee80211_local *local = sdata->local;
1484
	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1485
	struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
1486
	int headroom;
1487
	bool may_encrypt;
1488

J
Johannes Berg 已提交
1489
	may_encrypt = !(info->flags & IEEE80211_TX_INTFL_DONT_ENCRYPT);
1490

J
Johannes Berg 已提交
1491
	headroom = local->tx_headroom;
1492 1493 1494 1495 1496
	if (may_encrypt)
		headroom += IEEE80211_ENCRYPT_HEADROOM;
	headroom -= skb_headroom(skb);
	headroom = max_t(int, 0, headroom);

1497
	if (ieee80211_skb_resize(sdata, skb, headroom, may_encrypt)) {
1498
		ieee80211_free_txskb(&local->hw, skb);
J
Johannes Berg 已提交
1499
		return;
1500 1501
	}

1502
	hdr = (struct ieee80211_hdr *) skb->data;
1503
	info->control.vif = &sdata->vif;
1504

M
Marco Porsch 已提交
1505 1506 1507
	if (ieee80211_vif_is_mesh(&sdata->vif)) {
		if (ieee80211_is_data(hdr->frame_control) &&
		    is_unicast_ether_addr(hdr->addr1)) {
J
Johannes Berg 已提交
1508
			if (mesh_nexthop_resolve(sdata, skb))
M
Marco Porsch 已提交
1509 1510 1511 1512
				return; /* skb queued: don't free */
		} else {
			ieee80211_mps_set_frame_flags(sdata, NULL, hdr);
		}
1513
	}
1514

1515
	ieee80211_set_qos_hdr(sdata, skb);
J
Johannes Berg 已提交
1516
	ieee80211_tx(sdata, skb, false, band);
1517 1518
}

1519 1520 1521 1522 1523 1524 1525 1526 1527 1528 1529 1530 1531 1532 1533 1534 1535 1536 1537 1538 1539 1540 1541 1542 1543 1544 1545 1546 1547 1548 1549 1550 1551 1552 1553 1554 1555 1556 1557 1558 1559 1560 1561 1562 1563 1564 1565 1566 1567 1568 1569 1570 1571 1572 1573 1574 1575 1576 1577 1578 1579 1580 1581 1582 1583 1584 1585 1586 1587 1588 1589 1590 1591 1592 1593 1594 1595 1596 1597 1598 1599 1600 1601
static bool ieee80211_parse_tx_radiotap(struct sk_buff *skb)
{
	struct ieee80211_radiotap_iterator iterator;
	struct ieee80211_radiotap_header *rthdr =
		(struct ieee80211_radiotap_header *) skb->data;
	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
	int ret = ieee80211_radiotap_iterator_init(&iterator, rthdr, skb->len,
						   NULL);
	u16 txflags;

	info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT |
		       IEEE80211_TX_CTL_DONTFRAG;

	/*
	 * for every radiotap entry that is present
	 * (ieee80211_radiotap_iterator_next returns -ENOENT when no more
	 * entries present, or -EINVAL on error)
	 */

	while (!ret) {
		ret = ieee80211_radiotap_iterator_next(&iterator);

		if (ret)
			continue;

		/* see if this argument is something we can use */
		switch (iterator.this_arg_index) {
		/*
		 * You must take care when dereferencing iterator.this_arg
		 * for multibyte types... the pointer is not aligned.  Use
		 * get_unaligned((type *)iterator.this_arg) to dereference
		 * iterator.this_arg for type "type" safely on all arches.
		*/
		case IEEE80211_RADIOTAP_FLAGS:
			if (*iterator.this_arg & IEEE80211_RADIOTAP_F_FCS) {
				/*
				 * this indicates that the skb we have been
				 * handed has the 32-bit FCS CRC at the end...
				 * we should react to that by snipping it off
				 * because it will be recomputed and added
				 * on transmission
				 */
				if (skb->len < (iterator._max_length + FCS_LEN))
					return false;

				skb_trim(skb, skb->len - FCS_LEN);
			}
			if (*iterator.this_arg & IEEE80211_RADIOTAP_F_WEP)
				info->flags &= ~IEEE80211_TX_INTFL_DONT_ENCRYPT;
			if (*iterator.this_arg & IEEE80211_RADIOTAP_F_FRAG)
				info->flags &= ~IEEE80211_TX_CTL_DONTFRAG;
			break;

		case IEEE80211_RADIOTAP_TX_FLAGS:
			txflags = get_unaligned_le16(iterator.this_arg);
			if (txflags & IEEE80211_RADIOTAP_F_TX_NOACK)
				info->flags |= IEEE80211_TX_CTL_NO_ACK;
			break;

		/*
		 * Please update the file
		 * Documentation/networking/mac80211-injection.txt
		 * when parsing new fields here.
		 */

		default:
			break;
		}
	}

	if (ret != -ENOENT) /* ie, if we didn't simply run out of fields */
		return false;

	/*
	 * remove the radiotap header
	 * iterator->_max_length was sanity-checked against
	 * skb->len by iterator init
	 */
	skb_pull(skb, iterator._max_length);

	return true;
}

1602 1603
netdev_tx_t ieee80211_monitor_start_xmit(struct sk_buff *skb,
					 struct net_device *dev)
1604 1605
{
	struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
J
Johannes Berg 已提交
1606 1607
	struct ieee80211_chanctx_conf *chanctx_conf;
	struct ieee80211_channel *chan;
1608 1609
	struct ieee80211_radiotap_header *prthdr =
		(struct ieee80211_radiotap_header *)skb->data;
J
Johannes Berg 已提交
1610
	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1611
	struct ieee80211_hdr *hdr;
J
Johannes Berg 已提交
1612
	struct ieee80211_sub_if_data *tmp_sdata, *sdata;
1613
	u16 len_rthdr;
J
Johannes Berg 已提交
1614
	int hdrlen;
1615

1616 1617 1618 1619 1620 1621 1622 1623 1624 1625 1626 1627 1628 1629
	/* check for not even having the fixed radiotap header part */
	if (unlikely(skb->len < sizeof(struct ieee80211_radiotap_header)))
		goto fail; /* too short to be possibly valid */

	/* is it a header version we can trust to find length from? */
	if (unlikely(prthdr->it_version))
		goto fail; /* only version 0 is supported */

	/* then there must be a radiotap header with a length we can use */
	len_rthdr = ieee80211_get_radiotap_len(skb->data);

	/* does the skb contain enough to deliver on the alleged length? */
	if (unlikely(skb->len < len_rthdr))
		goto fail; /* skb too short for claimed rt header extent */
1630 1631 1632 1633 1634 1635 1636

	/*
	 * fix up the pointers accounting for the radiotap
	 * header still being in there.  We are being given
	 * a precooked IEEE80211 header so no need for
	 * normal processing
	 */
1637
	skb_set_mac_header(skb, len_rthdr);
1638
	/*
1639 1640
	 * these are just fixed to the end of the rt area since we
	 * don't have any better information and at this point, nobody cares
1641
	 */
1642 1643
	skb_set_network_header(skb, len_rthdr);
	skb_set_transport_header(skb, len_rthdr);
1644

J
Johannes Berg 已提交
1645 1646 1647 1648 1649 1650 1651 1652 1653
	if (skb->len < len_rthdr + 2)
		goto fail;

	hdr = (struct ieee80211_hdr *)(skb->data + len_rthdr);
	hdrlen = ieee80211_hdrlen(hdr->frame_control);

	if (skb->len < len_rthdr + hdrlen)
		goto fail;

1654 1655 1656 1657
	/*
	 * Initialize skb->protocol if the injected frame is a data frame
	 * carrying a rfc1042 header
	 */
J
Johannes Berg 已提交
1658 1659 1660 1661
	if (ieee80211_is_data(hdr->frame_control) &&
	    skb->len >= len_rthdr + hdrlen + sizeof(rfc1042_header) + 2) {
		u8 *payload = (u8 *)hdr + hdrlen;

1662
		if (ether_addr_equal(payload, rfc1042_header))
J
Johannes Berg 已提交
1663 1664
			skb->protocol = cpu_to_be16((payload[6] << 8) |
						    payload[7]);
1665 1666
	}

J
Johannes Berg 已提交
1667 1668
	memset(info, 0, sizeof(*info));

J
Johannes Berg 已提交
1669
	info->flags = IEEE80211_TX_CTL_REQ_TX_STATUS |
1670 1671 1672 1673 1674
		      IEEE80211_TX_CTL_INJECTED;

	/* process and remove the injection radiotap header */
	if (!ieee80211_parse_tx_radiotap(skb))
		goto fail;
J
Johannes Berg 已提交
1675 1676 1677 1678 1679 1680 1681 1682 1683 1684 1685 1686 1687 1688 1689 1690 1691 1692 1693 1694

	rcu_read_lock();

	/*
	 * We process outgoing injected frames that have a local address
	 * we handle as though they are non-injected frames.
	 * This code here isn't entirely correct, the local MAC address
	 * isn't always enough to find the interface to use; for proper
	 * VLAN/WDS support we will need a different mechanism (which
	 * likely isn't going to be monitor interfaces).
	 */
	sdata = IEEE80211_DEV_TO_SUB_IF(dev);

	list_for_each_entry_rcu(tmp_sdata, &local->interfaces, list) {
		if (!ieee80211_sdata_running(tmp_sdata))
			continue;
		if (tmp_sdata->vif.type == NL80211_IFTYPE_MONITOR ||
		    tmp_sdata->vif.type == NL80211_IFTYPE_AP_VLAN ||
		    tmp_sdata->vif.type == NL80211_IFTYPE_WDS)
			continue;
1695
		if (ether_addr_equal(tmp_sdata->vif.addr, hdr->addr2)) {
J
Johannes Berg 已提交
1696 1697 1698 1699
			sdata = tmp_sdata;
			break;
		}
	}
1700

J
Johannes Berg 已提交
1701 1702 1703 1704 1705 1706 1707 1708
	chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
	if (!chanctx_conf) {
		tmp_sdata = rcu_dereference(local->monitor_sdata);
		if (tmp_sdata)
			chanctx_conf =
				rcu_dereference(tmp_sdata->vif.chanctx_conf);
	}

1709 1710 1711 1712 1713 1714
	if (chanctx_conf)
		chan = chanctx_conf->def.chan;
	else if (!local->use_chanctx)
		chan = local->_oper_channel;
	else
		goto fail_rcu;
J
Johannes Berg 已提交
1715 1716 1717 1718 1719 1720 1721 1722 1723 1724 1725 1726 1727 1728 1729 1730 1731 1732 1733 1734 1735 1736

	/*
	 * Frame injection is not allowed if beaconing is not allowed
	 * or if we need radar detection. Beaconing is usually not allowed when
	 * the mode or operation (Adhoc, AP, Mesh) does not support DFS.
	 * Passive scan is also used in world regulatory domains where
	 * your country is not known and as such it should be treated as
	 * NO TX unless the channel is explicitly allowed in which case
	 * your current regulatory domain would not have the passive scan
	 * flag.
	 *
	 * Since AP mode uses monitor interfaces to inject/TX management
	 * frames we can make AP mode the exception to this rule once it
	 * supports radar detection as its implementation can deal with
	 * radar detection by itself. We can do that later by adding a
	 * monitor flag interfaces used for AP support.
	 */
	if ((chan->flags & (IEEE80211_CHAN_NO_IBSS | IEEE80211_CHAN_RADAR |
			    IEEE80211_CHAN_PASSIVE_SCAN)))
		goto fail_rcu;

	ieee80211_xmit(sdata, skb, chan->band);
J
Johannes Berg 已提交
1737 1738
	rcu_read_unlock();

1739
	return NETDEV_TX_OK;
1740

J
Johannes Berg 已提交
1741 1742
fail_rcu:
	rcu_read_unlock();
1743 1744 1745
fail:
	dev_kfree_skb(skb);
	return NETDEV_TX_OK; /* meaning, we dealt with the skb */
1746 1747 1748 1749 1750 1751 1752 1753 1754 1755 1756 1757 1758 1759 1760 1761 1762
}

/**
 * ieee80211_subif_start_xmit - netif start_xmit function for Ethernet-type
 * subinterfaces (wlan#, WDS, and VLAN interfaces)
 * @skb: packet to be sent
 * @dev: incoming interface
 *
 * Returns: 0 on success (and frees skb in this case) or 1 on failure (skb will
 * not be freed, and caller is responsible for either retrying later or freeing
 * skb).
 *
 * This function takes in an Ethernet header and encapsulates it with suitable
 * IEEE 802.11 header based on which interface the packet is coming in. The
 * encapsulated packet will then be passed to master interface, wlan#.11, for
 * transmission (through low-level driver).
 */
1763 1764
netdev_tx_t ieee80211_subif_start_xmit(struct sk_buff *skb,
				    struct net_device *dev)
1765
{
1766 1767
	struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
	struct ieee80211_local *local = sdata->local;
1768
	struct ieee80211_tx_info *info;
1769
	int head_need;
1770 1771
	u16 ethertype, hdrlen,  meshhdrlen = 0;
	__le16 fc;
1772
	struct ieee80211_hdr hdr;
1773
	struct ieee80211s_hdr mesh_hdr __maybe_unused;
1774
	struct mesh_path __maybe_unused *mppath = NULL, *mpath = NULL;
1775 1776
	const u8 *encaps_data;
	int encaps_len, skip_header_bytes;
1777
	int nh_pos, h_pos;
1778
	struct sta_info *sta = NULL;
J
Johannes Berg 已提交
1779
	bool wme_sta = false, authorized = false, tdls_auth = false;
1780
	bool tdls_direct = false;
J
Johannes Berg 已提交
1781 1782 1783
	bool multicast;
	u32 info_flags = 0;
	u16 info_id = 0;
J
Johannes Berg 已提交
1784 1785 1786
	struct ieee80211_chanctx_conf *chanctx_conf;
	struct ieee80211_sub_if_data *ap_sdata;
	enum ieee80211_band band;
1787

1788
	if (unlikely(skb->len < ETH_HLEN))
1789 1790 1791 1792 1793
		goto fail;

	/* convert Ethernet header to proper 802.11 header (based on
	 * operation mode) */
	ethertype = (skb->data[12] << 8) | skb->data[13];
1794
	fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_DATA);
1795

J
Johannes Berg 已提交
1796 1797
	rcu_read_lock();

1798
	switch (sdata->vif.type) {
1799
	case NL80211_IFTYPE_AP_VLAN:
1800
		sta = rcu_dereference(sdata->u.vlan.sta);
1801 1802 1803 1804
		if (sta) {
			fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS);
			/* RA TA DA SA */
			memcpy(hdr.addr1, sta->sta.addr, ETH_ALEN);
1805
			memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN);
1806 1807 1808
			memcpy(hdr.addr3, skb->data, ETH_ALEN);
			memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN);
			hdrlen = 30;
J
Johannes Berg 已提交
1809 1810
			authorized = test_sta_flag(sta, WLAN_STA_AUTHORIZED);
			wme_sta = test_sta_flag(sta, WLAN_STA_WME);
1811
		}
J
Johannes Berg 已提交
1812 1813 1814 1815 1816
		ap_sdata = container_of(sdata->bss, struct ieee80211_sub_if_data,
					u.ap);
		chanctx_conf = rcu_dereference(ap_sdata->vif.chanctx_conf);
		if (!chanctx_conf)
			goto fail_rcu;
1817
		band = chanctx_conf->def.chan->band;
1818 1819 1820 1821
		if (sta)
			break;
		/* fall through */
	case NL80211_IFTYPE_AP:
A
Arnd Bergmann 已提交
1822 1823 1824 1825
		if (sdata->vif.type == NL80211_IFTYPE_AP)
			chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
		if (!chanctx_conf)
			goto fail_rcu;
1826
		fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS);
1827 1828
		/* DA BSSID SA */
		memcpy(hdr.addr1, skb->data, ETH_ALEN);
1829
		memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN);
1830 1831
		memcpy(hdr.addr3, skb->data + ETH_ALEN, ETH_ALEN);
		hdrlen = 24;
1832
		band = chanctx_conf->def.chan->band;
1833
		break;
1834
	case NL80211_IFTYPE_WDS:
1835
		fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS);
1836 1837
		/* RA TA DA SA */
		memcpy(hdr.addr1, sdata->u.wds.remote_addr, ETH_ALEN);
1838
		memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN);
1839 1840 1841
		memcpy(hdr.addr3, skb->data, ETH_ALEN);
		memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN);
		hdrlen = 30;
J
Johannes Berg 已提交
1842 1843 1844 1845 1846
		/*
		 * This is the exception! WDS style interfaces are prohibited
		 * when channel contexts are in used so this must be valid
		 */
		band = local->hw.conf.channel->band;
1847
		break;
1848
#ifdef CONFIG_MAC80211_MESH
1849
	case NL80211_IFTYPE_MESH_POINT:
1850
		if (!sdata->u.mesh.mshcfg.dot11MeshTTL) {
1851
			/* Do not send frames with mesh_ttl == 0 */
1852
			sdata->u.mesh.mshstats.dropped_frames_ttl++;
J
Johannes Berg 已提交
1853
			goto fail_rcu;
1854
		}
J
Johannes Berg 已提交
1855

1856
		if (!is_multicast_ether_addr(skb->data)) {
1857 1858 1859
			struct sta_info *next_hop;
			bool mpp_lookup = true;

J
Johannes Berg 已提交
1860
			mpath = mesh_path_lookup(sdata, skb->data);
1861 1862 1863 1864 1865 1866 1867 1868 1869 1870
			if (mpath) {
				mpp_lookup = false;
				next_hop = rcu_dereference(mpath->next_hop);
				if (!next_hop ||
				    !(mpath->flags & (MESH_PATH_ACTIVE |
						      MESH_PATH_RESOLVING)))
					mpp_lookup = true;
			}

			if (mpp_lookup)
J
Johannes Berg 已提交
1871
				mppath = mpp_path_lookup(sdata, skb->data);
1872 1873 1874

			if (mppath && mpath)
				mesh_path_del(mpath->sdata, mpath->dst);
1875
		}
1876

1877
		/*
1878 1879 1880 1881
		 * Use address extension if it is a packet from
		 * another interface or if we know the destination
		 * is being proxied by a portal (i.e. portal address
		 * differs from proxied address)
1882
		 */
1883 1884
		if (ether_addr_equal(sdata->vif.addr, skb->data + ETH_ALEN) &&
		    !(mppath && !ether_addr_equal(mppath->mpp, skb->data))) {
1885 1886
			hdrlen = ieee80211_fill_mesh_addresses(&hdr, &fc,
					skb->data, skb->data + ETH_ALEN);
J
Johannes Berg 已提交
1887 1888
			meshhdrlen = ieee80211_new_mesh_header(sdata, &mesh_hdr,
							       NULL, NULL);
1889
		} else {
1890 1891 1892 1893 1894 1895 1896 1897 1898 1899 1900 1901
			/* DS -> MBSS (802.11-2012 13.11.3.3).
			 * For unicast with unknown forwarding information,
			 * destination might be in the MBSS or if that fails
			 * forwarded to another mesh gate. In either case
			 * resolution will be handled in ieee80211_xmit(), so
			 * leave the original DA. This also works for mcast */
			const u8 *mesh_da = skb->data;

			if (mppath)
				mesh_da = mppath->mpp;
			else if (mpath)
				mesh_da = mpath->dst;
1902

1903
			hdrlen = ieee80211_fill_mesh_addresses(&hdr, &fc,
1904
					mesh_da, sdata->vif.addr);
1905 1906
			if (is_multicast_ether_addr(mesh_da))
				/* DA TA mSA AE:SA */
J
Johannes Berg 已提交
1907 1908 1909
				meshhdrlen = ieee80211_new_mesh_header(
						sdata, &mesh_hdr,
						skb->data + ETH_ALEN, NULL);
1910
			else
1911
				/* RA TA mDA mSA AE:DA SA */
J
Johannes Berg 已提交
1912 1913 1914
				meshhdrlen = ieee80211_new_mesh_header(
						sdata, &mesh_hdr, skb->data,
						skb->data + ETH_ALEN);
1915 1916

		}
J
Johannes Berg 已提交
1917 1918 1919
		chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
		if (!chanctx_conf)
			goto fail_rcu;
1920
		band = chanctx_conf->def.chan->band;
1921 1922
		break;
#endif
1923
	case NL80211_IFTYPE_STATION:
1924
		if (sdata->wdev.wiphy->flags & WIPHY_FLAG_SUPPORTS_TDLS) {
J
Johannes Berg 已提交
1925 1926
			bool tdls_peer = false;

1927
			sta = sta_info_get(sdata, skb->data);
J
Johannes Berg 已提交
1928 1929 1930 1931 1932 1933 1934 1935 1936
			if (sta) {
				authorized = test_sta_flag(sta,
							WLAN_STA_AUTHORIZED);
				wme_sta = test_sta_flag(sta, WLAN_STA_WME);
				tdls_peer = test_sta_flag(sta,
							 WLAN_STA_TDLS_PEER);
				tdls_auth = test_sta_flag(sta,
						WLAN_STA_TDLS_PEER_AUTH);
			}
1937 1938 1939 1940 1941 1942

			/*
			 * If the TDLS link is enabled, send everything
			 * directly. Otherwise, allow TDLS setup frames
			 * to be transmitted indirectly.
			 */
J
Johannes Berg 已提交
1943
			tdls_direct = tdls_peer && (tdls_auth ||
1944 1945 1946 1947 1948 1949
				 !(ethertype == ETH_P_TDLS && skb->len > 14 &&
				   skb->data[14] == WLAN_TDLS_SNAP_RFTYPE));
		}

		if (tdls_direct) {
			/* link during setup - throw out frames to peer */
1950
			if (!tdls_auth)
J
Johannes Berg 已提交
1951
				goto fail_rcu;
1952 1953 1954 1955 1956 1957 1958 1959 1960 1961

			/* DA SA BSSID */
			memcpy(hdr.addr1, skb->data, ETH_ALEN);
			memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
			memcpy(hdr.addr3, sdata->u.mgd.bssid, ETH_ALEN);
			hdrlen = 24;
		}  else if (sdata->u.mgd.use_4addr &&
			    cpu_to_be16(ethertype) != sdata->control_port_protocol) {
			fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS |
					  IEEE80211_FCTL_TODS);
1962
			/* RA TA DA SA */
1963
			memcpy(hdr.addr1, sdata->u.mgd.bssid, ETH_ALEN);
1964
			memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN);
1965 1966 1967 1968 1969 1970
			memcpy(hdr.addr3, skb->data, ETH_ALEN);
			memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN);
			hdrlen = 30;
		} else {
			fc |= cpu_to_le16(IEEE80211_FCTL_TODS);
			/* BSSID SA DA */
1971
			memcpy(hdr.addr1, sdata->u.mgd.bssid, ETH_ALEN);
1972 1973 1974 1975
			memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
			memcpy(hdr.addr3, skb->data, ETH_ALEN);
			hdrlen = 24;
		}
J
Johannes Berg 已提交
1976 1977 1978
		chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
		if (!chanctx_conf)
			goto fail_rcu;
1979
		band = chanctx_conf->def.chan->band;
1980
		break;
1981
	case NL80211_IFTYPE_ADHOC:
1982 1983 1984
		/* DA SA BSSID */
		memcpy(hdr.addr1, skb->data, ETH_ALEN);
		memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
1985
		memcpy(hdr.addr3, sdata->u.ibss.bssid, ETH_ALEN);
1986
		hdrlen = 24;
J
Johannes Berg 已提交
1987 1988 1989
		chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
		if (!chanctx_conf)
			goto fail_rcu;
1990
		band = chanctx_conf->def.chan->band;
1991 1992
		break;
	default:
J
Johannes Berg 已提交
1993
		goto fail_rcu;
1994 1995
	}

1996 1997 1998 1999 2000
	/*
	 * There's no need to try to look up the destination
	 * if it is a multicast address (which can only happen
	 * in AP mode)
	 */
J
Johannes Berg 已提交
2001 2002
	multicast = is_multicast_ether_addr(hdr.addr1);
	if (!multicast) {
2003
		sta = sta_info_get(sdata, hdr.addr1);
J
Johannes Berg 已提交
2004 2005 2006 2007
		if (sta) {
			authorized = test_sta_flag(sta, WLAN_STA_AUTHORIZED);
			wme_sta = test_sta_flag(sta, WLAN_STA_WME);
		}
2008 2009
	}

2010 2011
	/* For mesh, the use of the QoS header is mandatory */
	if (ieee80211_vif_is_mesh(&sdata->vif))
J
Johannes Berg 已提交
2012
		wme_sta = true;
2013

2014
	/* receiver and we are QoS enabled, use a QoS type frame */
J
Johannes Berg 已提交
2015
	if (wme_sta && local->hw.queues >= IEEE80211_NUM_ACS) {
2016
		fc |= cpu_to_le16(IEEE80211_STYPE_QOS_DATA);
2017 2018 2019 2020
		hdrlen += 2;
	}

	/*
2021 2022
	 * Drop unicast frames to unauthorised stations unless they are
	 * EAPOL frames from the local station.
2023
	 */
2024 2025 2026
	if (unlikely(!ieee80211_vif_is_mesh(&sdata->vif) &&
		     !is_multicast_ether_addr(hdr.addr1) && !authorized &&
		     (cpu_to_be16(ethertype) != sdata->control_port_protocol ||
2027
		      !ether_addr_equal(sdata->vif.addr, skb->data + ETH_ALEN)))) {
2028
#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
J
Johannes Berg 已提交
2029
		net_info_ratelimited("%s: dropped frame to %pM (unauthorized port)\n",
2030
				    dev->name, hdr.addr1);
2031 2032 2033 2034
#endif

		I802_DEBUG_INC(local->tx_handlers_drop_unauth_port);

J
Johannes Berg 已提交
2035
		goto fail_rcu;
2036 2037
	}

J
Johannes Berg 已提交
2038 2039 2040 2041 2042 2043 2044
	if (unlikely(!multicast && skb->sk &&
		     skb_shinfo(skb)->tx_flags & SKBTX_WIFI_STATUS)) {
		struct sk_buff *orig_skb = skb;

		skb = skb_clone(skb, GFP_ATOMIC);
		if (skb) {
			unsigned long flags;
T
Tejun Heo 已提交
2045
			int id;
J
Johannes Berg 已提交
2046 2047

			spin_lock_irqsave(&local->ack_status_lock, flags);
T
Tejun Heo 已提交
2048 2049
			id = idr_alloc(&local->ack_status_frames, orig_skb,
				       1, 0x10000, GFP_ATOMIC);
J
Johannes Berg 已提交
2050 2051
			spin_unlock_irqrestore(&local->ack_status_lock, flags);

T
Tejun Heo 已提交
2052
			if (id >= 0) {
J
Johannes Berg 已提交
2053 2054 2055 2056 2057 2058 2059 2060 2061 2062 2063 2064 2065 2066
				info_id = id;
				info_flags |= IEEE80211_TX_CTL_REQ_TX_STATUS;
			} else if (skb_shared(skb)) {
				kfree_skb(orig_skb);
			} else {
				kfree_skb(skb);
				skb = orig_skb;
			}
		} else {
			/* couldn't clone -- lose tx status ... */
			skb = orig_skb;
		}
	}

2067 2068 2069 2070
	/*
	 * If the skb is shared we need to obtain our own copy.
	 */
	if (skb_shared(skb)) {
J
Johannes Berg 已提交
2071 2072 2073 2074 2075
		struct sk_buff *tmp_skb = skb;

		/* can't happen -- skb is a clone if info_id != 0 */
		WARN_ON(info_id);

2076
		skb = skb_clone(skb, GFP_ATOMIC);
2077 2078
		kfree_skb(tmp_skb);

2079
		if (!skb)
J
Johannes Berg 已提交
2080
			goto fail_rcu;
2081 2082
	}

2083
	hdr.frame_control = fc;
2084 2085 2086 2087 2088 2089 2090 2091 2092 2093 2094 2095 2096 2097 2098 2099 2100
	hdr.duration_id = 0;
	hdr.seq_ctrl = 0;

	skip_header_bytes = ETH_HLEN;
	if (ethertype == ETH_P_AARP || ethertype == ETH_P_IPX) {
		encaps_data = bridge_tunnel_header;
		encaps_len = sizeof(bridge_tunnel_header);
		skip_header_bytes -= 2;
	} else if (ethertype >= 0x600) {
		encaps_data = rfc1042_header;
		encaps_len = sizeof(rfc1042_header);
		skip_header_bytes -= 2;
	} else {
		encaps_data = NULL;
		encaps_len = 0;
	}

2101 2102 2103
	nh_pos = skb_network_header(skb) - skb->data;
	h_pos = skb_transport_header(skb) - skb->data;

2104 2105 2106 2107
	skb_pull(skb, skip_header_bytes);
	nh_pos -= skip_header_bytes;
	h_pos -= skip_header_bytes;

2108
	head_need = hdrlen + encaps_len + meshhdrlen - skb_headroom(skb);
2109

2110 2111 2112 2113 2114 2115 2116 2117 2118 2119 2120
	/*
	 * So we need to modify the skb header and hence need a copy of
	 * that. The head_need variable above doesn't, so far, include
	 * the needed header space that we don't need right away. If we
	 * can, then we don't reallocate right now but only after the
	 * frame arrives at the master device (if it does...)
	 *
	 * If we cannot, however, then we will reallocate to include all
	 * the ever needed space. Also, if we need to reallocate it anyway,
	 * make it big enough for everything we may ever need.
	 */
2121

2122
	if (head_need > 0 || skb_cloned(skb)) {
2123 2124 2125
		head_need += IEEE80211_ENCRYPT_HEADROOM;
		head_need += local->tx_headroom;
		head_need = max_t(int, 0, head_need);
2126 2127
		if (ieee80211_skb_resize(sdata, skb, head_need, true)) {
			ieee80211_free_txskb(&local->hw, skb);
J
Johannes Berg 已提交
2128
			skb = NULL;
J
Johannes Berg 已提交
2129
			goto fail_rcu;
2130
		}
2131 2132 2133 2134 2135 2136 2137
	}

	if (encaps_data) {
		memcpy(skb_push(skb, encaps_len), encaps_data, encaps_len);
		nh_pos += encaps_len;
		h_pos += encaps_len;
	}
2138

2139
#ifdef CONFIG_MAC80211_MESH
2140 2141 2142 2143 2144
	if (meshhdrlen > 0) {
		memcpy(skb_push(skb, meshhdrlen), &mesh_hdr, meshhdrlen);
		nh_pos += meshhdrlen;
		h_pos += meshhdrlen;
	}
2145
#endif
2146

2147
	if (ieee80211_is_data_qos(fc)) {
2148 2149 2150 2151 2152 2153 2154 2155 2156 2157 2158 2159
		__le16 *qos_control;

		qos_control = (__le16*) skb_push(skb, 2);
		memcpy(skb_push(skb, hdrlen - 2), &hdr, hdrlen - 2);
		/*
		 * Maybe we could actually set some fields here, for now just
		 * initialise to zero to indicate no special operation.
		 */
		*qos_control = 0;
	} else
		memcpy(skb_push(skb, hdrlen), &hdr, hdrlen);

2160 2161 2162
	nh_pos += hdrlen;
	h_pos += hdrlen;

2163 2164
	dev->stats.tx_packets++;
	dev->stats.tx_bytes += skb->len;
2165 2166 2167 2168 2169 2170 2171 2172

	/* Update skb pointers to various headers since this modified frame
	 * is going to go through Linux networking code that may potentially
	 * need things like pointer to IP header. */
	skb_set_mac_header(skb, 0);
	skb_set_network_header(skb, nh_pos);
	skb_set_transport_header(skb, h_pos);

2173
	info = IEEE80211_SKB_CB(skb);
J
Johannes Berg 已提交
2174 2175
	memset(info, 0, sizeof(*info));

2176
	dev->trans_start = jiffies;
J
Johannes Berg 已提交
2177 2178 2179 2180

	info->flags = info_flags;
	info->ack_frame_id = info_id;

J
Johannes Berg 已提交
2181 2182
	ieee80211_xmit(sdata, skb, band);
	rcu_read_unlock();
2183

2184
	return NETDEV_TX_OK;
2185

J
Johannes Berg 已提交
2186 2187
 fail_rcu:
	rcu_read_unlock();
2188
 fail:
2189 2190
	dev_kfree_skb(skb);
	return NETDEV_TX_OK;
2191 2192 2193
}


2194 2195 2196 2197
/*
 * ieee80211_clear_tx_pending may not be called in a context where
 * it is possible that it packets could come in again.
 */
2198 2199
void ieee80211_clear_tx_pending(struct ieee80211_local *local)
{
2200
	struct sk_buff *skb;
J
Johannes Berg 已提交
2201
	int i;
2202

2203 2204 2205 2206
	for (i = 0; i < local->hw.queues; i++) {
		while ((skb = skb_dequeue(&local->pending[i])) != NULL)
			ieee80211_free_txskb(&local->hw, skb);
	}
2207 2208
}

2209 2210 2211 2212 2213
/*
 * Returns false if the frame couldn't be transmitted but was queued instead,
 * which in this case means re-queued -- take as an indication to stop sending
 * more pending frames.
 */
2214 2215 2216 2217 2218 2219 2220
static bool ieee80211_tx_pending_skb(struct ieee80211_local *local,
				     struct sk_buff *skb)
{
	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
	struct ieee80211_sub_if_data *sdata;
	struct sta_info *sta;
	struct ieee80211_hdr *hdr;
2221
	bool result;
J
Johannes Berg 已提交
2222
	struct ieee80211_chanctx_conf *chanctx_conf;
2223

2224
	sdata = vif_to_sdata(info->control.vif);
2225 2226

	if (info->flags & IEEE80211_TX_INTFL_NEED_TXPROCESSING) {
J
Johannes Berg 已提交
2227 2228 2229 2230 2231 2232
		chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
		if (unlikely(!chanctx_conf)) {
			dev_kfree_skb(skb);
			return true;
		}
		result = ieee80211_tx(sdata, skb, true,
2233
				      chanctx_conf->def.chan->band);
2234
	} else {
2235 2236 2237 2238 2239
		struct sk_buff_head skbs;

		__skb_queue_head_init(&skbs);
		__skb_queue_tail(&skbs, skb);

2240
		hdr = (struct ieee80211_hdr *)skb->data;
2241
		sta = sta_info_get(sdata, hdr->addr1);
2242

2243
		result = __ieee80211_tx(local, &skbs, skb->len, sta, true);
2244 2245 2246 2247 2248
	}

	return result;
}

2249
/*
J
Johannes Berg 已提交
2250
 * Transmit all pending packets. Called from tasklet.
2251
 */
2252 2253 2254
void ieee80211_tx_pending(unsigned long data)
{
	struct ieee80211_local *local = (struct ieee80211_local *)data;
2255
	unsigned long flags;
2256
	int i;
J
Johannes Berg 已提交
2257
	bool txok;
2258

2259
	rcu_read_lock();
2260

J
Johannes Berg 已提交
2261
	spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
2262 2263 2264 2265 2266
	for (i = 0; i < local->hw.queues; i++) {
		/*
		 * If queue is stopped by something other than due to pending
		 * frames, or we have no pending frames, proceed to next queue.
		 */
J
Johannes Berg 已提交
2267
		if (local->queue_stop_reasons[i] ||
2268
		    skb_queue_empty(&local->pending[i]))
2269
			continue;
2270

2271
		while (!skb_queue_empty(&local->pending[i])) {
J
Johannes Berg 已提交
2272
			struct sk_buff *skb = __skb_dequeue(&local->pending[i]);
2273 2274
			struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);

2275
			if (WARN_ON(!info->control.vif)) {
2276
				ieee80211_free_txskb(&local->hw, skb);
2277 2278 2279
				continue;
			}

J
Johannes Berg 已提交
2280 2281 2282 2283 2284 2285 2286
			spin_unlock_irqrestore(&local->queue_stop_reason_lock,
						flags);

			txok = ieee80211_tx_pending_skb(local, skb);
			spin_lock_irqsave(&local->queue_stop_reason_lock,
					  flags);
			if (!txok)
2287
				break;
2288
		}
2289 2290

		if (skb_queue_empty(&local->pending[i]))
2291
			ieee80211_propagate_queue_wake(local, i);
2292
	}
J
Johannes Berg 已提交
2293
	spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
2294

2295
	rcu_read_unlock();
2296 2297 2298 2299
}

/* functions for drivers to get certain frames */

2300 2301
static void __ieee80211_beacon_add_tim(struct ieee80211_sub_if_data *sdata,
				       struct ps_data *ps, struct sk_buff *skb)
2302 2303 2304 2305 2306 2307 2308
{
	u8 *pos, *tim;
	int aid0 = 0;
	int i, have_bits = 0, n1, n2;

	/* Generate bitmap for TIM only if there are any STAs in power save
	 * mode. */
2309
	if (atomic_read(&ps->num_sta_ps) > 0)
2310 2311
		/* in the hope that this is faster than
		 * checking byte-for-byte */
2312
		have_bits = !bitmap_empty((unsigned long*)ps->tim,
2313 2314
					  IEEE80211_MAX_AID+1);

2315 2316
	if (ps->dtim_count == 0)
		ps->dtim_count = sdata->vif.bss_conf.dtim_period - 1;
2317
	else
2318
		ps->dtim_count--;
2319 2320 2321 2322

	tim = pos = (u8 *) skb_put(skb, 6);
	*pos++ = WLAN_EID_TIM;
	*pos++ = 4;
2323
	*pos++ = ps->dtim_count;
2324
	*pos++ = sdata->vif.bss_conf.dtim_period;
2325

2326
	if (ps->dtim_count == 0 && !skb_queue_empty(&ps->bc_buf))
2327 2328
		aid0 = 1;

2329
	ps->dtim_bc_mc = aid0 == 1;
2330

2331 2332 2333 2334 2335 2336
	if (have_bits) {
		/* Find largest even number N1 so that bits numbered 1 through
		 * (N1 x 8) - 1 in the bitmap are 0 and number N2 so that bits
		 * (N2 + 1) x 8 through 2007 are 0. */
		n1 = 0;
		for (i = 0; i < IEEE80211_MAX_TIM_LEN; i++) {
2337
			if (ps->tim[i]) {
2338 2339 2340 2341 2342 2343
				n1 = i & 0xfe;
				break;
			}
		}
		n2 = n1;
		for (i = IEEE80211_MAX_TIM_LEN - 1; i >= n1; i--) {
2344
			if (ps->tim[i]) {
2345 2346 2347 2348 2349 2350 2351 2352
				n2 = i;
				break;
			}
		}

		/* Bitmap control */
		*pos++ = n1 | aid0;
		/* Part Virt Bitmap */
2353
		skb_put(skb, n2 - n1);
2354
		memcpy(pos, ps->tim + n1, n2 - n1 + 1);
2355 2356 2357 2358 2359 2360 2361 2362

		tim[1] = n2 - n1 + 4;
	} else {
		*pos++ = aid0; /* Bitmap control */
		*pos++ = 0; /* Part Virt Bitmap */
	}
}

2363 2364 2365 2366 2367 2368 2369 2370 2371 2372 2373 2374 2375 2376 2377
static int ieee80211_beacon_add_tim(struct ieee80211_sub_if_data *sdata,
				    struct ps_data *ps, struct sk_buff *skb)
{
	struct ieee80211_local *local = sdata->local;

	/*
	 * Not very nice, but we want to allow the driver to call
	 * ieee80211_beacon_get() as a response to the set_tim()
	 * callback. That, however, is already invoked under the
	 * sta_lock to guarantee consistent and race-free update
	 * of the tim bitmap in mac80211 and the driver.
	 */
	if (local->tim_in_locked_section) {
		__ieee80211_beacon_add_tim(sdata, ps, skb);
	} else {
J
Johannes Berg 已提交
2378
		spin_lock_bh(&local->tim_lock);
2379
		__ieee80211_beacon_add_tim(sdata, ps, skb);
J
Johannes Berg 已提交
2380
		spin_unlock_bh(&local->tim_lock);
2381 2382 2383 2384 2385
	}

	return 0;
}

2386 2387 2388
struct sk_buff *ieee80211_beacon_get_tim(struct ieee80211_hw *hw,
					 struct ieee80211_vif *vif,
					 u16 *tim_offset, u16 *tim_length)
2389 2390
{
	struct ieee80211_local *local = hw_to_local(hw);
2391
	struct sk_buff *skb = NULL;
2392
	struct ieee80211_tx_info *info;
2393
	struct ieee80211_sub_if_data *sdata = NULL;
J
Johannes Berg 已提交
2394
	enum ieee80211_band band;
2395
	struct ieee80211_tx_rate_control txrc;
J
Johannes Berg 已提交
2396
	struct ieee80211_chanctx_conf *chanctx_conf;
2397

2398
	rcu_read_lock();
2399

2400
	sdata = vif_to_sdata(vif);
J
Johannes Berg 已提交
2401
	chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
2402

J
Johannes Berg 已提交
2403
	if (!ieee80211_sdata_running(sdata) || !chanctx_conf)
2404 2405
		goto out;

2406 2407 2408 2409 2410
	if (tim_offset)
		*tim_offset = 0;
	if (tim_length)
		*tim_length = 0;

2411
	if (sdata->vif.type == NL80211_IFTYPE_AP) {
2412 2413 2414
		struct ieee80211_if_ap *ap = &sdata->u.ap;
		struct beacon_data *beacon = rcu_dereference(ap->beacon);

D
Dan Carpenter 已提交
2415
		if (beacon) {
J
Johannes Berg 已提交
2416 2417 2418 2419 2420 2421 2422 2423 2424
			/*
			 * headroom, head length,
			 * tail length and maximum TIM length
			 */
			skb = dev_alloc_skb(local->tx_headroom +
					    beacon->head_len +
					    beacon->tail_len + 256);
			if (!skb)
				goto out;
2425

J
Johannes Berg 已提交
2426 2427 2428
			skb_reserve(skb, local->tx_headroom);
			memcpy(skb_put(skb, beacon->head_len), beacon->head,
			       beacon->head_len);
2429

2430
			ieee80211_beacon_add_tim(sdata, &ap->ps, skb);
2431

2432 2433 2434 2435 2436
			if (tim_offset)
				*tim_offset = beacon->head_len;
			if (tim_length)
				*tim_length = skb->len - beacon->head_len;

J
Johannes Berg 已提交
2437 2438 2439
			if (beacon->tail)
				memcpy(skb_put(skb, beacon->tail_len),
				       beacon->tail, beacon->tail_len);
2440 2441
		} else
			goto out;
2442
	} else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
2443
		struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
2444
		struct ieee80211_hdr *hdr;
2445
		struct beacon_data *presp = rcu_dereference(ifibss->presp);
2446

2447
		if (!presp)
2448 2449
			goto out;

2450
		skb = dev_alloc_skb(local->tx_headroom + presp->head_len);
2451 2452
		if (!skb)
			goto out;
2453 2454 2455
		skb_reserve(skb, local->tx_headroom);
		memcpy(skb_put(skb, presp->head_len), presp->head,
		       presp->head_len);
2456 2457

		hdr = (struct ieee80211_hdr *) skb->data;
2458 2459
		hdr->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
						 IEEE80211_STYPE_BEACON);
J
Johannes Berg 已提交
2460
	} else if (ieee80211_vif_is_mesh(&sdata->vif)) {
2461
		struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
T
Thomas Pedersen 已提交
2462
		struct beacon_data *bcn = rcu_dereference(ifmsh->beacon);
2463

T
Thomas Pedersen 已提交
2464
		if (!bcn)
2465 2466
			goto out;

2467 2468 2469 2470
		if (ifmsh->sync_ops)
			ifmsh->sync_ops->adjust_tbtt(
						sdata);

2471
		skb = dev_alloc_skb(local->tx_headroom +
T
Thomas Pedersen 已提交
2472
				    bcn->head_len +
M
Marco Porsch 已提交
2473
				    256 + /* TIM IE */
T
Thomas Pedersen 已提交
2474
				    bcn->tail_len);
J
Johannes Berg 已提交
2475 2476
		if (!skb)
			goto out;
T
Thomas Pedersen 已提交
2477 2478 2479 2480
		skb_reserve(skb, local->tx_headroom);
		memcpy(skb_put(skb, bcn->head_len), bcn->head, bcn->head_len);
		ieee80211_beacon_add_tim(sdata, &ifmsh->ps, skb);
		memcpy(skb_put(skb, bcn->tail_len), bcn->tail, bcn->tail_len);
2481 2482
	} else {
		WARN_ON(1);
2483
		goto out;
2484 2485
	}

2486
	band = chanctx_conf->def.chan->band;
J
Johannes Berg 已提交
2487

2488 2489
	info = IEEE80211_SKB_CB(skb);

J
Johannes Berg 已提交
2490
	info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
2491
	info->flags |= IEEE80211_TX_CTL_NO_ACK;
2492
	info->band = band;
2493 2494 2495

	memset(&txrc, 0, sizeof(txrc));
	txrc.hw = hw;
2496
	txrc.sband = local->hw.wiphy->bands[band];
2497 2498 2499
	txrc.bss_conf = &sdata->vif.bss_conf;
	txrc.skb = skb;
	txrc.reported_rate.idx = -1;
2500
	txrc.rate_idx_mask = sdata->rc_rateidx_mask[band];
2501
	if (txrc.rate_idx_mask == (1 << txrc.sband->n_bitrates) - 1)
2502 2503 2504
		txrc.max_rate_idx = -1;
	else
		txrc.max_rate_idx = fls(txrc.rate_idx_mask) - 1;
2505 2506
	memcpy(txrc.rate_idx_mcs_mask, sdata->rc_rateidx_mcs_mask[band],
	       sizeof(txrc.rate_idx_mcs_mask));
2507
	txrc.bss = true;
2508
	rate_control_get_rate(sdata, NULL, &txrc);
2509 2510

	info->control.vif = vif;
2511

2512 2513 2514
	info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT |
			IEEE80211_TX_CTL_ASSIGN_SEQ |
			IEEE80211_TX_CTL_FIRST_FRAGMENT;
2515
 out:
2516
	rcu_read_unlock();
2517 2518
	return skb;
}
2519
EXPORT_SYMBOL(ieee80211_beacon_get_tim);
2520

2521 2522 2523 2524
struct sk_buff *ieee80211_proberesp_get(struct ieee80211_hw *hw,
					struct ieee80211_vif *vif)
{
	struct ieee80211_if_ap *ap = NULL;
2525 2526
	struct sk_buff *skb = NULL;
	struct probe_resp *presp = NULL;
2527 2528 2529 2530 2531 2532 2533 2534 2535 2536 2537 2538 2539
	struct ieee80211_hdr *hdr;
	struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);

	if (sdata->vif.type != NL80211_IFTYPE_AP)
		return NULL;

	rcu_read_lock();

	ap = &sdata->u.ap;
	presp = rcu_dereference(ap->probe_resp);
	if (!presp)
		goto out;

2540
	skb = dev_alloc_skb(presp->len);
2541 2542 2543
	if (!skb)
		goto out;

2544 2545
	memcpy(skb_put(skb, presp->len), presp->data, presp->len);

2546 2547 2548 2549 2550 2551 2552 2553 2554
	hdr = (struct ieee80211_hdr *) skb->data;
	memset(hdr->addr1, 0, sizeof(hdr->addr1));

out:
	rcu_read_unlock();
	return skb;
}
EXPORT_SYMBOL(ieee80211_proberesp_get);

2555 2556 2557 2558 2559 2560 2561 2562 2563 2564 2565 2566 2567 2568 2569 2570 2571
struct sk_buff *ieee80211_pspoll_get(struct ieee80211_hw *hw,
				     struct ieee80211_vif *vif)
{
	struct ieee80211_sub_if_data *sdata;
	struct ieee80211_if_managed *ifmgd;
	struct ieee80211_pspoll *pspoll;
	struct ieee80211_local *local;
	struct sk_buff *skb;

	if (WARN_ON(vif->type != NL80211_IFTYPE_STATION))
		return NULL;

	sdata = vif_to_sdata(vif);
	ifmgd = &sdata->u.mgd;
	local = sdata->local;

	skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*pspoll));
2572
	if (!skb)
2573
		return NULL;
2574

2575 2576 2577 2578 2579 2580 2581 2582 2583 2584 2585 2586 2587 2588 2589 2590 2591 2592 2593 2594 2595 2596 2597 2598 2599 2600 2601 2602 2603 2604 2605 2606 2607 2608 2609
	skb_reserve(skb, local->hw.extra_tx_headroom);

	pspoll = (struct ieee80211_pspoll *) skb_put(skb, sizeof(*pspoll));
	memset(pspoll, 0, sizeof(*pspoll));
	pspoll->frame_control = cpu_to_le16(IEEE80211_FTYPE_CTL |
					    IEEE80211_STYPE_PSPOLL);
	pspoll->aid = cpu_to_le16(ifmgd->aid);

	/* aid in PS-Poll has its two MSBs each set to 1 */
	pspoll->aid |= cpu_to_le16(1 << 15 | 1 << 14);

	memcpy(pspoll->bssid, ifmgd->bssid, ETH_ALEN);
	memcpy(pspoll->ta, vif->addr, ETH_ALEN);

	return skb;
}
EXPORT_SYMBOL(ieee80211_pspoll_get);

struct sk_buff *ieee80211_nullfunc_get(struct ieee80211_hw *hw,
				       struct ieee80211_vif *vif)
{
	struct ieee80211_hdr_3addr *nullfunc;
	struct ieee80211_sub_if_data *sdata;
	struct ieee80211_if_managed *ifmgd;
	struct ieee80211_local *local;
	struct sk_buff *skb;

	if (WARN_ON(vif->type != NL80211_IFTYPE_STATION))
		return NULL;

	sdata = vif_to_sdata(vif);
	ifmgd = &sdata->u.mgd;
	local = sdata->local;

	skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*nullfunc));
2610
	if (!skb)
2611
		return NULL;
2612

2613 2614 2615 2616 2617 2618 2619 2620 2621 2622 2623 2624 2625 2626 2627 2628
	skb_reserve(skb, local->hw.extra_tx_headroom);

	nullfunc = (struct ieee80211_hdr_3addr *) skb_put(skb,
							  sizeof(*nullfunc));
	memset(nullfunc, 0, sizeof(*nullfunc));
	nullfunc->frame_control = cpu_to_le16(IEEE80211_FTYPE_DATA |
					      IEEE80211_STYPE_NULLFUNC |
					      IEEE80211_FCTL_TODS);
	memcpy(nullfunc->addr1, ifmgd->bssid, ETH_ALEN);
	memcpy(nullfunc->addr2, vif->addr, ETH_ALEN);
	memcpy(nullfunc->addr3, ifmgd->bssid, ETH_ALEN);

	return skb;
}
EXPORT_SYMBOL(ieee80211_nullfunc_get);

2629 2630 2631
struct sk_buff *ieee80211_probereq_get(struct ieee80211_hw *hw,
				       struct ieee80211_vif *vif,
				       const u8 *ssid, size_t ssid_len,
2632
				       size_t tailroom)
2633 2634 2635 2636 2637 2638 2639 2640 2641 2642 2643 2644 2645
{
	struct ieee80211_sub_if_data *sdata;
	struct ieee80211_local *local;
	struct ieee80211_hdr_3addr *hdr;
	struct sk_buff *skb;
	size_t ie_ssid_len;
	u8 *pos;

	sdata = vif_to_sdata(vif);
	local = sdata->local;
	ie_ssid_len = 2 + ssid_len;

	skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*hdr) +
2646
			    ie_ssid_len + tailroom);
2647
	if (!skb)
2648 2649 2650 2651 2652 2653 2654 2655
		return NULL;

	skb_reserve(skb, local->hw.extra_tx_headroom);

	hdr = (struct ieee80211_hdr_3addr *) skb_put(skb, sizeof(*hdr));
	memset(hdr, 0, sizeof(*hdr));
	hdr->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
					 IEEE80211_STYPE_PROBE_REQ);
J
Johannes Berg 已提交
2656
	eth_broadcast_addr(hdr->addr1);
2657
	memcpy(hdr->addr2, vif->addr, ETH_ALEN);
J
Johannes Berg 已提交
2658
	eth_broadcast_addr(hdr->addr3);
2659 2660 2661 2662

	pos = skb_put(skb, ie_ssid_len);
	*pos++ = WLAN_EID_SSID;
	*pos++ = ssid_len;
2663
	if (ssid_len)
2664 2665 2666 2667 2668 2669 2670
		memcpy(pos, ssid, ssid_len);
	pos += ssid_len;

	return skb;
}
EXPORT_SYMBOL(ieee80211_probereq_get);

2671
void ieee80211_rts_get(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
2672
		       const void *frame, size_t frame_len,
2673
		       const struct ieee80211_tx_info *frame_txctl,
2674 2675 2676 2677
		       struct ieee80211_rts *rts)
{
	const struct ieee80211_hdr *hdr = frame;

2678 2679
	rts->frame_control =
	    cpu_to_le16(IEEE80211_FTYPE_CTL | IEEE80211_STYPE_RTS);
2680 2681
	rts->duration = ieee80211_rts_duration(hw, vif, frame_len,
					       frame_txctl);
2682 2683 2684 2685 2686
	memcpy(rts->ra, hdr->addr1, sizeof(rts->ra));
	memcpy(rts->ta, hdr->addr2, sizeof(rts->ta));
}
EXPORT_SYMBOL(ieee80211_rts_get);

2687
void ieee80211_ctstoself_get(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
2688
			     const void *frame, size_t frame_len,
2689
			     const struct ieee80211_tx_info *frame_txctl,
2690 2691 2692 2693
			     struct ieee80211_cts *cts)
{
	const struct ieee80211_hdr *hdr = frame;

2694 2695
	cts->frame_control =
	    cpu_to_le16(IEEE80211_FTYPE_CTL | IEEE80211_STYPE_CTS);
2696 2697
	cts->duration = ieee80211_ctstoself_duration(hw, vif,
						     frame_len, frame_txctl);
2698 2699 2700 2701 2702
	memcpy(cts->ra, hdr->addr1, sizeof(cts->ra));
}
EXPORT_SYMBOL(ieee80211_ctstoself_get);

struct sk_buff *
2703
ieee80211_get_buffered_bc(struct ieee80211_hw *hw,
2704
			  struct ieee80211_vif *vif)
2705 2706
{
	struct ieee80211_local *local = hw_to_local(hw);
2707
	struct sk_buff *skb = NULL;
2708
	struct ieee80211_tx_data tx;
2709
	struct ieee80211_sub_if_data *sdata;
2710
	struct ps_data *ps;
2711
	struct ieee80211_tx_info *info;
J
Johannes Berg 已提交
2712
	struct ieee80211_chanctx_conf *chanctx_conf;
2713

2714
	sdata = vif_to_sdata(vif);
2715 2716

	rcu_read_lock();
J
Johannes Berg 已提交
2717
	chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
2718

2719 2720 2721 2722 2723 2724 2725 2726 2727 2728 2729
	if (!chanctx_conf)
		goto out;

	if (sdata->vif.type == NL80211_IFTYPE_AP) {
		struct beacon_data *beacon =
				rcu_dereference(sdata->u.ap.beacon);

		if (!beacon || !beacon->head)
			goto out;

		ps = &sdata->u.ap.ps;
M
Marco Porsch 已提交
2730 2731
	} else if (ieee80211_vif_is_mesh(&sdata->vif)) {
		ps = &sdata->u.mesh.ps;
2732
	} else {
2733
		goto out;
2734
	}
2735

2736
	if (ps->dtim_count != 0 || !ps->dtim_bc_mc)
2737
		goto out; /* send buffered bc/mc only after DTIM beacon */
2738

2739
	while (1) {
2740
		skb = skb_dequeue(&ps->bc_buf);
2741
		if (!skb)
2742
			goto out;
2743 2744
		local->total_ps_buffered--;

2745
		if (!skb_queue_empty(&ps->bc_buf) && skb->len >= 2) {
2746 2747 2748 2749 2750 2751 2752 2753 2754
			struct ieee80211_hdr *hdr =
				(struct ieee80211_hdr *) skb->data;
			/* more buffered multicast/broadcast frames ==> set
			 * MoreData flag in IEEE 802.11 header to inform PS
			 * STAs */
			hdr->frame_control |=
				cpu_to_le16(IEEE80211_FCTL_MOREDATA);
		}

2755 2756
		if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
			sdata = IEEE80211_DEV_TO_SUB_IF(skb->dev);
J
Johannes Berg 已提交
2757
		if (!ieee80211_tx_prepare(sdata, &tx, skb))
2758 2759 2760
			break;
		dev_kfree_skb_any(skb);
	}
2761 2762 2763

	info = IEEE80211_SKB_CB(skb);

2764
	tx.flags |= IEEE80211_TX_PS_BUFFERED;
2765
	info->band = chanctx_conf->def.chan->band;
2766

2767
	if (invoke_tx_handlers(&tx))
2768
		skb = NULL;
2769
 out:
2770
	rcu_read_unlock();
2771 2772 2773 2774

	return skb;
}
EXPORT_SYMBOL(ieee80211_get_buffered_bc);
J
Johannes Berg 已提交
2775

J
Johannes Berg 已提交
2776 2777 2778
void __ieee80211_tx_skb_tid_band(struct ieee80211_sub_if_data *sdata,
				 struct sk_buff *skb, int tid,
				 enum ieee80211_band band)
J
Johannes Berg 已提交
2779
{
2780
	int ac = ieee802_1d_to_ac[tid & 7];
2781

J
Johannes Berg 已提交
2782 2783 2784 2785
	skb_set_mac_header(skb, 0);
	skb_set_network_header(skb, 0);
	skb_set_transport_header(skb, 0);

2786
	skb_set_queue_mapping(skb, ac);
2787
	skb->priority = tid;
2788

2789 2790
	skb->dev = sdata->dev;

2791 2792 2793 2794 2795 2796
	/*
	 * The other path calling ieee80211_xmit is from the tasklet,
	 * and while we can handle concurrent transmissions locking
	 * requirements are that we do not come into tx with bhs on.
	 */
	local_bh_disable();
J
Johannes Berg 已提交
2797
	ieee80211_xmit(sdata, skb, band);
2798
	local_bh_enable();
J
Johannes Berg 已提交
2799
}