[MAC80211]: split TX path into own file

Signed-off-by: Johannes Berg <johannes@sipsolutions.net>
Signed-off-by: Jiri Benc <jbenc@suse.cz>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

4 files changed, 1884 insertions, 1849 deletions

diff --git a/net/mac80211/Makefile b/net/mac80211/Makefile
index 0353e75ec96..848260296a0 100644
--- a/net/mac80211/Makefile
+++ b/net/mac80211/Makefile
@@ -19,4 +19,5 @@ mac80211-objs := \
 	aes_ccm.o \
 	ieee80211_cfg.o \
 	rx.o \
+	tx.o \
 	$(mac80211-objs-y)
diff --git a/net/mac80211/ieee80211.c b/net/mac80211/ieee80211.c
index c0094209bed..a35e3a95a15 100644
--- a/net/mac80211/ieee80211.c
+++ b/net/mac80211/ieee80211.c
@@ -24,7 +24,6 @@
 #include <linux/compiler.h>
 #include <linux/bitmap.h>
 #include <net/cfg80211.h>
-#include <asm/unaligned.h>
 
 #include "ieee80211_common.h"
 #include "ieee80211_i.h"
@@ -68,16 +67,6 @@ struct ieee80211_tx_status_rtap_hdr {
 } __attribute__ ((packed));
 
 
-static inline void ieee80211_include_sequence(struct ieee80211_sub_if_data *sdata,
-					      struct ieee80211_hdr *hdr)
-{
-	/* Set the sequence number for this frame. */
-	hdr->seq_ctrl = cpu_to_le16(sdata->sequence);
-
-	/* Increase the sequence number. */
-	sdata->sequence = (sdata->sequence + 0x10) & IEEE80211_SCTL_SEQ;
-}
-
 struct ieee80211_key_conf *
 ieee80211_key_data2conf(struct ieee80211_local *local,
 			const struct ieee80211_key *data)
@@ -346,45 +335,6 @@ int ieee80211_get_hdrlen_from_skb(const struct sk_buff *skb)
 EXPORT_SYMBOL(ieee80211_get_hdrlen_from_skb);
 
 
-#ifdef CONFIG_MAC80211_LOWTX_FRAME_DUMP
-static void ieee80211_dump_frame(const char *ifname, const char *title,
-				 const struct sk_buff *skb)
-{
-	const struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
-	u16 fc;
-	int hdrlen;
-
-	printk(KERN_DEBUG "%s: %s (len=%d)", ifname, title, skb->len);
-	if (skb->len < 4) {
-		printk("\n");
-		return;
-	}
-
-	fc = le16_to_cpu(hdr->frame_control);
-	hdrlen = ieee80211_get_hdrlen(fc);
-	if (hdrlen > skb->len)
-		hdrlen = skb->len;
-	if (hdrlen >= 4)
-		printk(" FC=0x%04x DUR=0x%04x",
-		       fc, le16_to_cpu(hdr->duration_id));
-	if (hdrlen >= 10)
-		printk(" A1=" MAC_FMT, MAC_ARG(hdr->addr1));
-	if (hdrlen >= 16)
-		printk(" A2=" MAC_FMT, MAC_ARG(hdr->addr2));
-	if (hdrlen >= 24)
-		printk(" A3=" MAC_FMT, MAC_ARG(hdr->addr3));
-	if (hdrlen >= 30)
-		printk(" A4=" MAC_FMT, MAC_ARG(hdr->addr4));
-	printk("\n");
-}
-#else /* CONFIG_MAC80211_LOWTX_FRAME_DUMP */
-static inline void ieee80211_dump_frame(const char *ifname, const char *title,
-					struct sk_buff *skb)
-{
-}
-#endif /* CONFIG_MAC80211_LOWTX_FRAME_DUMP */
-
-
 int ieee80211_is_eapol(const struct sk_buff *skb)
 {
 	const struct ieee80211_hdr *hdr;
@@ -411,187 +361,6 @@ int ieee80211_is_eapol(const struct sk_buff *skb)
 }
 
 
-static ieee80211_txrx_result
-ieee80211_tx_h_rate_ctrl(struct ieee80211_txrx_data *tx)
-{
-	struct rate_control_extra extra;
-
-	memset(&extra, 0, sizeof(extra));
-	extra.mode = tx->u.tx.mode;
-	extra.mgmt_data = tx->sdata &&
-		tx->sdata->type == IEEE80211_IF_TYPE_MGMT;
-	extra.ethertype = tx->ethertype;
-
-	tx->u.tx.rate = rate_control_get_rate(tx->local, tx->dev, tx->skb,
-					      &extra);
-	if (unlikely(extra.probe != NULL)) {
-		tx->u.tx.control->flags |= IEEE80211_TXCTL_RATE_CTRL_PROBE;
-		tx->u.tx.probe_last_frag = 1;
-		tx->u.tx.control->alt_retry_rate = tx->u.tx.rate->val;
-		tx->u.tx.rate = extra.probe;
-	} else {
-		tx->u.tx.control->alt_retry_rate = -1;
-	}
-	if (!tx->u.tx.rate)
-		return TXRX_DROP;
-	if (tx->u.tx.mode->mode == MODE_IEEE80211G &&
-	    tx->sdata->use_protection && tx->fragmented &&
-	    extra.nonerp) {
-		tx->u.tx.last_frag_rate = tx->u.tx.rate;
-		tx->u.tx.probe_last_frag = extra.probe ? 1 : 0;
-
-		tx->u.tx.rate = extra.nonerp;
-		tx->u.tx.control->rate = extra.nonerp;
-		tx->u.tx.control->flags &= ~IEEE80211_TXCTL_RATE_CTRL_PROBE;
-	} else {
-		tx->u.tx.last_frag_rate = tx->u.tx.rate;
-		tx->u.tx.control->rate = tx->u.tx.rate;
-	}
-	tx->u.tx.control->tx_rate = tx->u.tx.rate->val;
-	if ((tx->u.tx.rate->flags & IEEE80211_RATE_PREAMBLE2) &&
-	    tx->local->short_preamble &&
-	    (!tx->sta || (tx->sta->flags & WLAN_STA_SHORT_PREAMBLE))) {
-		tx->u.tx.short_preamble = 1;
-		tx->u.tx.control->tx_rate = tx->u.tx.rate->val2;
-	}
-
-	return TXRX_CONTINUE;
-}
-
-
-static ieee80211_txrx_result
-ieee80211_tx_h_select_key(struct ieee80211_txrx_data *tx)
-{
-	if (tx->sta)
-		tx->u.tx.control->key_idx = tx->sta->key_idx_compression;
-	else
-		tx->u.tx.control->key_idx = HW_KEY_IDX_INVALID;
-
-	if (unlikely(tx->u.tx.control->flags & IEEE80211_TXCTL_DO_NOT_ENCRYPT))
-		tx->key = NULL;
-	else if (tx->sta && tx->sta->key)
-		tx->key = tx->sta->key;
-	else if (tx->sdata->default_key)
-		tx->key = tx->sdata->default_key;
-	else if (tx->sdata->drop_unencrypted &&
-		 !(tx->sdata->eapol && ieee80211_is_eapol(tx->skb))) {
-		I802_DEBUG_INC(tx->local->tx_handlers_drop_unencrypted);
-		return TXRX_DROP;
-	} else
-		tx->key = NULL;
-
-	if (tx->key) {
-		tx->key->tx_rx_count++;
-		if (unlikely(tx->local->key_tx_rx_threshold &&
-			     tx->key->tx_rx_count >
-			     tx->local->key_tx_rx_threshold)) {
-			ieee80211_key_threshold_notify(tx->dev, tx->key,
-						       tx->sta);
-		}
-	}
-
-	return TXRX_CONTINUE;
-}
-
-
-static ieee80211_txrx_result
-ieee80211_tx_h_fragment(struct ieee80211_txrx_data *tx)
-{
-	struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) tx->skb->data;
-	size_t hdrlen, per_fragm, num_fragm, payload_len, left;
-	struct sk_buff **frags, *first, *frag;
-	int i;
-	u16 seq;
-	u8 *pos;
-	int frag_threshold = tx->local->fragmentation_threshold;
-
-	if (!tx->fragmented)
-		return TXRX_CONTINUE;
-
-	first = tx->skb;
-
-	hdrlen = ieee80211_get_hdrlen(tx->fc);
-	payload_len = first->len - hdrlen;
-	per_fragm = frag_threshold - hdrlen - FCS_LEN;
-	num_fragm = (payload_len + per_fragm - 1) / per_fragm;
-
-	frags = kzalloc(num_fragm * sizeof(struct sk_buff *), GFP_ATOMIC);
-	if (!frags)
-		goto fail;
-
-	hdr->frame_control |= cpu_to_le16(IEEE80211_FCTL_MOREFRAGS);
-	seq = le16_to_cpu(hdr->seq_ctrl) & IEEE80211_SCTL_SEQ;
-	pos = first->data + hdrlen + per_fragm;
-	left = payload_len - per_fragm;
-	for (i = 0; i < num_fragm - 1; i++) {
-		struct ieee80211_hdr *fhdr;
-		size_t copylen;
-
-		if (left <= 0)
-			goto fail;
-
-		/* reserve enough extra head and tail room for possible
-		 * encryption */
-		frag = frags[i] =
-			dev_alloc_skb(tx->local->tx_headroom +
-				      frag_threshold +
-				      IEEE80211_ENCRYPT_HEADROOM +
-				      IEEE80211_ENCRYPT_TAILROOM);
-		if (!frag)
-			goto fail;
-		/* Make sure that all fragments use the same priority so
-		 * that they end up using the same TX queue */
-		frag->priority = first->priority;
-		skb_reserve(frag, tx->local->tx_headroom +
-				  IEEE80211_ENCRYPT_HEADROOM);
-		fhdr = (struct ieee80211_hdr *) skb_put(frag, hdrlen);
-		memcpy(fhdr, first->data, hdrlen);
-		if (i == num_fragm - 2)
-			fhdr->frame_control &= cpu_to_le16(~IEEE80211_FCTL_MOREFRAGS);
-		fhdr->seq_ctrl = cpu_to_le16(seq | ((i + 1) & IEEE80211_SCTL_FRAG));
-		copylen = left > per_fragm ? per_fragm : left;
-		memcpy(skb_put(frag, copylen), pos, copylen);
-
-		pos += copylen;
-		left -= copylen;
-	}
-	skb_trim(first, hdrlen + per_fragm);
-
-	tx->u.tx.num_extra_frag = num_fragm - 1;
-	tx->u.tx.extra_frag = frags;
-
-	return TXRX_CONTINUE;
-
- fail:
-	printk(KERN_DEBUG "%s: failed to fragment frame\n", tx->dev->name);
-	if (frags) {
-		for (i = 0; i < num_fragm - 1; i++)
-			if (frags[i])
-				dev_kfree_skb(frags[i]);
-		kfree(frags);
-	}
-	I802_DEBUG_INC(tx->local->tx_handlers_drop_fragment);
-	return TXRX_DROP;
-}
-
-
-static int wep_encrypt_skb(struct ieee80211_txrx_data *tx, struct sk_buff *skb)
-{
-	if (tx->key->force_sw_encrypt) {
-		if (ieee80211_wep_encrypt(tx->local, skb, tx->key))
-			return -1;
-	} else {
-		tx->u.tx.control->key_idx = tx->key->hw_key_idx;
-		if (tx->local->hw.flags & IEEE80211_HW_WEP_INCLUDE_IV) {
-			if (ieee80211_wep_add_iv(tx->local, skb, tx->key) ==
-			    NULL)
-				return -1;
-		}
-	}
-	return 0;
-}
-
-
 void ieee80211_tx_set_iswep(struct ieee80211_txrx_data *tx)
 {
 	struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) tx->skb->data;
@@ -609,44 +378,6 @@ void ieee80211_tx_set_iswep(struct ieee80211_txrx_data *tx)
 }
 
 
-static ieee80211_txrx_result
-ieee80211_tx_h_wep_encrypt(struct ieee80211_txrx_data *tx)
-{
-	struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) tx->skb->data;
-	u16 fc;
-
-	fc = le16_to_cpu(hdr->frame_control);
-
-	if (!tx->key || tx->key->alg != ALG_WEP ||
-	    ((fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_DATA &&
-	     ((fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_MGMT ||
-	      (fc & IEEE80211_FCTL_STYPE) != IEEE80211_STYPE_AUTH)))
-		return TXRX_CONTINUE;
-
-	tx->u.tx.control->iv_len = WEP_IV_LEN;
-	tx->u.tx.control->icv_len = WEP_ICV_LEN;
-	ieee80211_tx_set_iswep(tx);
-
-	if (wep_encrypt_skb(tx, tx->skb) < 0) {
-		I802_DEBUG_INC(tx->local->tx_handlers_drop_wep);
-		return TXRX_DROP;
-	}
-
-	if (tx->u.tx.extra_frag) {
-		int i;
-		for (i = 0; i < tx->u.tx.num_extra_frag; i++) {
-			if (wep_encrypt_skb(tx, tx->u.tx.extra_frag[i]) < 0) {
-				I802_DEBUG_INC(tx->local->
-					       tx_handlers_drop_wep);
-				return TXRX_DROP;
-			}
-		}
-	}
-
-	return TXRX_CONTINUE;
-}
-
-
 static int ieee80211_frame_duration(struct ieee80211_local *local, size_t len,
 				    int rate, int erp, int short_preamble)
 {
@@ -720,1400 +451,6 @@ __le16 ieee80211_generic_frame_duration(struct ieee80211_hw *hw,
 EXPORT_SYMBOL(ieee80211_generic_frame_duration);
 
 
-static u16 ieee80211_duration(struct ieee80211_txrx_data *tx, int group_addr,
-			      int next_frag_len)
-{
-	int rate, mrate, erp, dur, i;
-	struct ieee80211_rate *txrate = tx->u.tx.rate;
-	struct ieee80211_local *local = tx->local;
-	struct ieee80211_hw_mode *mode = tx->u.tx.mode;
-
-	erp = txrate->flags & IEEE80211_RATE_ERP;
-
-	/*
-	 * 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
-	 */
-
-	if ((tx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_CTL) {
-		/* TODO: These control frames are not currently sent by
-		 * 80211.o, but should they be implemented, this function
-		 * 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 */)
-		return 32768;
-
-	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;
-	mrate = 10; /* use 1 Mbps if everything fails */
-	for (i = 0; i < mode->num_rates; i++) {
-		struct ieee80211_rate *r = &mode->rates[i];
-		if (r->rate > txrate->rate)
-			break;
-
-		if (IEEE80211_RATE_MODULATION(txrate->flags) !=
-		    IEEE80211_RATE_MODULATION(r->flags))
-			continue;
-
-		if (r->flags & IEEE80211_RATE_BASIC)
-			rate = r->rate;
-		else if (r->flags & IEEE80211_RATE_MANDATORY)
-			mrate = r->rate;
-	}
-	if (rate == -1) {
-		/* No matching basic rate found; use highest suitable mandatory
-		 * PHY rate */
-		rate = mrate;
-	}
-
-	/* Time needed to transmit ACK
-	 * (10 bytes + 4-byte FCS = 112 bits) plus SIFS; rounded up
-	 * to closest integer */
-
-	dur = ieee80211_frame_duration(local, 10, rate, erp,
-				       local->short_preamble);
-
-	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 */
-		dur += ieee80211_frame_duration(local, next_frag_len,
-						txrate->rate, erp,
-						local->short_preamble);
-	}
-
-	return dur;
-}
-
-
-static ieee80211_txrx_result
-ieee80211_tx_h_misc(struct ieee80211_txrx_data *tx)
-{
-	struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) tx->skb->data;
-	u16 dur;
-	struct ieee80211_tx_control *control = tx->u.tx.control;
-	struct ieee80211_hw_mode *mode = tx->u.tx.mode;
-
-	if (!is_multicast_ether_addr(hdr->addr1)) {
-		if (tx->skb->len + FCS_LEN > tx->local->rts_threshold &&
-		    tx->local->rts_threshold < IEEE80211_MAX_RTS_THRESHOLD) {
-			control->flags |= IEEE80211_TXCTL_USE_RTS_CTS;
-			control->retry_limit =
-				tx->local->long_retry_limit;
-		} else {
-			control->retry_limit =
-				tx->local->short_retry_limit;
-		}
-	} else {
-		control->retry_limit = 1;
-	}
-
-	if (tx->fragmented) {
-		/* Do not use multiple retry rates when sending fragmented
-		 * frames.
-		 * TODO: The last fragment could still use multiple retry
-		 * rates. */
-		control->alt_retry_rate = -1;
-	}
-
-	/* Use CTS protection for unicast frames sent using extended rates if
-	 * there are associated non-ERP stations and RTS/CTS is not configured
-	 * for the frame. */
-	if (mode->mode == MODE_IEEE80211G &&
-	    (tx->u.tx.rate->flags & IEEE80211_RATE_ERP) &&
-	    tx->u.tx.unicast && tx->sdata->use_protection &&
-	    !(control->flags & IEEE80211_TXCTL_USE_RTS_CTS))
-		control->flags |= IEEE80211_TXCTL_USE_CTS_PROTECT;
-
-	/* Setup duration field for the first fragment of the frame. Duration
-	 * for remaining fragments will be updated when they are being sent
-	 * to low-level driver in ieee80211_tx(). */
-	dur = ieee80211_duration(tx, is_multicast_ether_addr(hdr->addr1),
-				 tx->fragmented ? tx->u.tx.extra_frag[0]->len :
-				 0);
-	hdr->duration_id = cpu_to_le16(dur);
-
-	if ((control->flags & IEEE80211_TXCTL_USE_RTS_CTS) ||
-	    (control->flags & IEEE80211_TXCTL_USE_CTS_PROTECT)) {
-		struct ieee80211_rate *rate;
-
-		/* Do not use multiple retry rates when using RTS/CTS */
-		control->alt_retry_rate = -1;
-
-		/* Use min(data rate, max base rate) as CTS/RTS rate */
-		rate = tx->u.tx.rate;
-		while (rate > mode->rates &&
-		       !(rate->flags & IEEE80211_RATE_BASIC))
-			rate--;
-
-		control->rts_cts_rate = rate->val;
-		control->rts_rate = rate;
-	}
-
-	if (tx->sta) {
-		tx->sta->tx_packets++;
-		tx->sta->tx_fragments++;
-		tx->sta->tx_bytes += tx->skb->len;
-		if (tx->u.tx.extra_frag) {
-			int i;
-			tx->sta->tx_fragments += tx->u.tx.num_extra_frag;
-			for (i = 0; i < tx->u.tx.num_extra_frag; i++) {
-				tx->sta->tx_bytes +=
-					tx->u.tx.extra_frag[i]->len;
-			}
-		}
-	}
-
-	return TXRX_CONTINUE;
-}
-
-
-static ieee80211_txrx_result
-ieee80211_tx_h_check_assoc(struct ieee80211_txrx_data *tx)
-{
-#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
-	struct sk_buff *skb = tx->skb;
-	struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
-#endif /* CONFIG_MAC80211_VERBOSE_DEBUG */
-	u32 sta_flags;
-
-	if (unlikely(tx->local->sta_scanning != 0) &&
-	    ((tx->fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_MGMT ||
-	     (tx->fc & IEEE80211_FCTL_STYPE) != IEEE80211_STYPE_PROBE_REQ))
-		return TXRX_DROP;
-
-	if (tx->u.tx.ps_buffered)
-		return TXRX_CONTINUE;
-
-	sta_flags = tx->sta ? tx->sta->flags : 0;
-
-	if (likely(tx->u.tx.unicast)) {
-		if (unlikely(!(sta_flags & WLAN_STA_ASSOC) &&
-			     tx->sdata->type != IEEE80211_IF_TYPE_IBSS &&
-			     (tx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_DATA)) {
-#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
-			printk(KERN_DEBUG "%s: dropped data frame to not "
-			       "associated station " MAC_FMT "\n",
-			       tx->dev->name, MAC_ARG(hdr->addr1));
-#endif /* CONFIG_MAC80211_VERBOSE_DEBUG */
-			I802_DEBUG_INC(tx->local->tx_handlers_drop_not_assoc);
-			return TXRX_DROP;
-		}
-	} else {
-		if (unlikely((tx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_DATA &&
-			     tx->local->num_sta == 0 &&
-			     !tx->local->allow_broadcast_always &&
-			     tx->sdata->type != IEEE80211_IF_TYPE_IBSS)) {
-			/*
-			 * No associated STAs - no need to send multicast
-			 * frames.
-			 */
-			return TXRX_DROP;
-		}
-		return TXRX_CONTINUE;
-	}
-
-	if (unlikely(!tx->u.tx.mgmt_interface && tx->sdata->ieee802_1x &&
-		     !(sta_flags & WLAN_STA_AUTHORIZED))) {
-#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
-		printk(KERN_DEBUG "%s: dropped frame to " MAC_FMT
-		       " (unauthorized port)\n", tx->dev->name,
-		       MAC_ARG(hdr->addr1));
-#endif
-		I802_DEBUG_INC(tx->local->tx_handlers_drop_unauth_port);
-		return TXRX_DROP;
-	}
-
-	return TXRX_CONTINUE;
-}
-
-static ieee80211_txrx_result
-ieee80211_tx_h_sequence(struct ieee80211_txrx_data *tx)
-{
-	struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
-
-	if (ieee80211_get_hdrlen(le16_to_cpu(hdr->frame_control)) >= 24)
-		ieee80211_include_sequence(tx->sdata, hdr);
-
-	return TXRX_CONTINUE;
-}
-
-/* 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;
-
-	read_lock(&local->sub_if_lock);
-	list_for_each_entry(sdata, &local->sub_if_list, list) {
-		struct ieee80211_if_ap *ap;
-		if (sdata->dev == local->mdev ||
-		    sdata->type != IEEE80211_IF_TYPE_AP)
-			continue;
-		ap = &sdata->u.ap;
-		skb = skb_dequeue(&ap->ps_bc_buf);
-		if (skb) {
-			purged++;
-			dev_kfree_skb(skb);
-		}
-		total += skb_queue_len(&ap->ps_bc_buf);
-	}
-	read_unlock(&local->sub_if_lock);
-
-	spin_lock_bh(&local->sta_lock);
-	list_for_each_entry(sta, &local->sta_list, list) {
-		skb = skb_dequeue(&sta->ps_tx_buf);
-		if (skb) {
-			purged++;
-			dev_kfree_skb(skb);
-		}
-		total += skb_queue_len(&sta->ps_tx_buf);
-	}
-	spin_unlock_bh(&local->sta_lock);
-
-	local->total_ps_buffered = total;
-	printk(KERN_DEBUG "%s: PS buffers full - purged %d frames\n",
-	       local->mdev->name, purged);
-}
-
-
-static inline ieee80211_txrx_result
-ieee80211_tx_h_multicast_ps_buf(struct ieee80211_txrx_data *tx)
-{
-	/* broadcast/multicast frame */
-	/* If any of the associated stations is in power save mode,
-	 * the frame is buffered to be sent after DTIM beacon frame */
-	if ((tx->local->hw.flags & IEEE80211_HW_HOST_BROADCAST_PS_BUFFERING) &&
-	    tx->sdata->type != IEEE80211_IF_TYPE_WDS &&
-	    tx->sdata->bss && atomic_read(&tx->sdata->bss->num_sta_ps) &&
-	    !(tx->fc & IEEE80211_FCTL_ORDER)) {
-		if (tx->local->total_ps_buffered >= TOTAL_MAX_TX_BUFFER)
-			purge_old_ps_buffers(tx->local);
-		if (skb_queue_len(&tx->sdata->bss->ps_bc_buf) >=
-		    AP_MAX_BC_BUFFER) {
-			if (net_ratelimit()) {
-				printk(KERN_DEBUG "%s: BC TX buffer full - "
-				       "dropping the oldest frame\n",
-				       tx->dev->name);
-			}
-			dev_kfree_skb(skb_dequeue(&tx->sdata->bss->ps_bc_buf));
-		} else
-			tx->local->total_ps_buffered++;
-		skb_queue_tail(&tx->sdata->bss->ps_bc_buf, tx->skb);
-		return TXRX_QUEUED;
-	}
-
-	return TXRX_CONTINUE;
-}
-
-
-static inline ieee80211_txrx_result
-ieee80211_tx_h_unicast_ps_buf(struct ieee80211_txrx_data *tx)
-{
-	struct sta_info *sta = tx->sta;
-
-	if (unlikely(!sta ||
-		     ((tx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_MGMT &&
-		      (tx->fc & IEEE80211_FCTL_STYPE) == IEEE80211_STYPE_PROBE_RESP)))
-		return TXRX_CONTINUE;
-
-	if (unlikely((sta->flags & WLAN_STA_PS) && !sta->pspoll)) {
-		struct ieee80211_tx_packet_data *pkt_data;
-#ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
-		printk(KERN_DEBUG "STA " MAC_FMT " aid %d: PS buffer (entries "
-		       "before %d)\n",
-		       MAC_ARG(sta->addr), sta->aid,
-		       skb_queue_len(&sta->ps_tx_buf));
-#endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
-		sta->flags |= WLAN_STA_TIM;
-		if (tx->local->total_ps_buffered >= TOTAL_MAX_TX_BUFFER)
-			purge_old_ps_buffers(tx->local);
-		if (skb_queue_len(&sta->ps_tx_buf) >= STA_MAX_TX_BUFFER) {
-			struct sk_buff *old = skb_dequeue(&sta->ps_tx_buf);
-			if (net_ratelimit()) {
-				printk(KERN_DEBUG "%s: STA " MAC_FMT " TX "
-				       "buffer full - dropping oldest frame\n",
-				       tx->dev->name, MAC_ARG(sta->addr));
-			}
-			dev_kfree_skb(old);
-		} else
-			tx->local->total_ps_buffered++;
-		/* Queue frame to be sent after STA sends an PS Poll frame */
-		if (skb_queue_empty(&sta->ps_tx_buf)) {
-			if (tx->local->ops->set_tim)
-				tx->local->ops->set_tim(local_to_hw(tx->local),
-						       sta->aid, 1);
-			if (tx->sdata->bss)
-				bss_tim_set(tx->local, tx->sdata->bss, sta->aid);
-		}
-		pkt_data = (struct ieee80211_tx_packet_data *)tx->skb->cb;
-		pkt_data->jiffies = jiffies;
-		skb_queue_tail(&sta->ps_tx_buf, tx->skb);
-		return TXRX_QUEUED;
-	}
-#ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
-	else if (unlikely(sta->flags & WLAN_STA_PS)) {
-		printk(KERN_DEBUG "%s: STA " MAC_FMT " in PS mode, but pspoll "
-		       "set -> send frame\n", tx->dev->name,
-		       MAC_ARG(sta->addr));
-	}
-#endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
-	sta->pspoll = 0;
-
-	return TXRX_CONTINUE;
-}
-
-
-static ieee80211_txrx_result
-ieee80211_tx_h_ps_buf(struct ieee80211_txrx_data *tx)
-{
-	if (unlikely(tx->u.tx.ps_buffered))
-		return TXRX_CONTINUE;
-
-	if (tx->u.tx.unicast)
-		return ieee80211_tx_h_unicast_ps_buf(tx);
-	else
-		return ieee80211_tx_h_multicast_ps_buf(tx);
-}
-
-
-/*
- * deal with packet injection down monitor interface
- * with Radiotap Header -- only called for monitor mode interface
- */
-
-static ieee80211_txrx_result
-__ieee80211_parse_tx_radiotap(
-	struct ieee80211_txrx_data *tx,
-	struct sk_buff *skb, struct ieee80211_tx_control *control)
-{
-	/*
-	 * this is the moment to interpret and discard the radiotap header that
-	 * must be at the start of the packet injected in Monitor mode
-	 *
-	 * Need to take some care with endian-ness since radiotap
-	 * args are little-endian
-	 */
-
-	struct ieee80211_radiotap_iterator iterator;
-	struct ieee80211_radiotap_header *rthdr =
-		(struct ieee80211_radiotap_header *) skb->data;
-	struct ieee80211_hw_mode *mode = tx->local->hw.conf.mode;
-	int ret = ieee80211_radiotap_iterator_init(&iterator, rthdr, skb->len);
-
-	/*
-	 * default control situation for all injected packets
-	 * FIXME: this does not suit all usage cases, expand to allow control
-	 */
-
-	control->retry_limit = 1; /* no retry */
-	control->key_idx = -1; /* no encryption key */
-	control->flags &= ~(IEEE80211_TXCTL_USE_RTS_CTS |
-			    IEEE80211_TXCTL_USE_CTS_PROTECT);
-	control->flags |= IEEE80211_TXCTL_DO_NOT_ENCRYPT |
-			  IEEE80211_TXCTL_NO_ACK;
-	control->antenna_sel_tx = 0; /* default to default antenna */
-
-	/*
-	 * for every radiotap entry that is present
-	 * (ieee80211_radiotap_iterator_next returns -ENOENT when no more
-	 * entries present, or -EINVAL on error)
-	 */
-
-	while (!ret) {
-		int i, target_rate;
-
-		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_RATE:
-			/*
-			 * radiotap rate u8 is in 500kbps units eg, 0x02=1Mbps
-			 * ieee80211 rate int is in 100kbps units eg, 0x0a=1Mbps
-			 */
-			target_rate = (*iterator.this_arg) * 5;
-			for (i = 0; i < mode->num_rates; i++) {
-				struct ieee80211_rate *r = &mode->rates[i];
-
-				if (r->rate > target_rate)
-					continue;
-
-				control->rate = r;
-
-				if (r->flags & IEEE80211_RATE_PREAMBLE2)
-					control->tx_rate = r->val2;
-				else
-					control->tx_rate = r->val;
-
-				/* end on exact match */
-				if (r->rate == target_rate)
-					i = mode->num_rates;
-			}
-			break;
-
-		case IEEE80211_RADIOTAP_ANTENNA:
-			/*
-			 * radiotap uses 0 for 1st ant, mac80211 is 1 for
-			 * 1st ant
-			 */
-			control->antenna_sel_tx = (*iterator.this_arg) + 1;
-			break;
-
-		case IEEE80211_RADIOTAP_DBM_TX_POWER:
-			control->power_level = *iterator.this_arg;
-			break;
-
-		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 TXRX_DROP;
-
-				skb_trim(skb, skb->len - FCS_LEN);
-			}
-			break;
-
-		default:
-			break;
-		}
-	}
-
-	if (ret != -ENOENT) /* ie, if we didn't simply run out of fields */
-		return TXRX_DROP;
-
-	/*
-	 * remove the radiotap header
-	 * iterator->max_length was sanity-checked against
-	 * skb->len by iterator init
-	 */
-	skb_pull(skb, iterator.max_length);
-
-	return TXRX_CONTINUE;
-}
-
-
-static ieee80211_txrx_result inline
-__ieee80211_tx_prepare(struct ieee80211_txrx_data *tx,
-		       struct sk_buff *skb,
-		       struct net_device *dev,
-		       struct ieee80211_tx_control *control)
-{
-	struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
-	struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
-	struct ieee80211_sub_if_data *sdata;
-	ieee80211_txrx_result res = TXRX_CONTINUE;
-
-	int hdrlen;
-
-	memset(tx, 0, sizeof(*tx));
-	tx->skb = skb;
-	tx->dev = dev; /* use original interface */
-	tx->local = local;
-	tx->sdata = IEEE80211_DEV_TO_SUB_IF(dev);
-	tx->sta = sta_info_get(local, hdr->addr1);
-	tx->fc = le16_to_cpu(hdr->frame_control);
-
-	/*
-	 * set defaults for things that can be set by
-	 * injected radiotap headers
-	 */
-	control->power_level = local->hw.conf.power_level;
-	control->antenna_sel_tx = local->hw.conf.antenna_sel_tx;
-	if (local->sta_antenna_sel != STA_ANTENNA_SEL_AUTO && tx->sta)
-		control->antenna_sel_tx = tx->sta->antenna_sel_tx;
-
-	/* process and remove the injection radiotap header */
-	sdata = IEEE80211_DEV_TO_SUB_IF(dev);
-	if (unlikely(sdata->type == IEEE80211_IF_TYPE_MNTR)) {
-		if (__ieee80211_parse_tx_radiotap(tx, skb, control) ==
-								TXRX_DROP) {
-			return TXRX_DROP;
-		}
-		/*
-		 * we removed the radiotap header after this point,
-		 * we filled control with what we could use
-		 * set to the actual ieee header now
-		 */
-		hdr = (struct ieee80211_hdr *) skb->data;
-		res = TXRX_QUEUED; /* indication it was monitor packet */
-	}
-
-	tx->u.tx.control = control;
-	tx->u.tx.unicast = !is_multicast_ether_addr(hdr->addr1);
-	if (is_multicast_ether_addr(hdr->addr1))
-		control->flags |= IEEE80211_TXCTL_NO_ACK;
-	else
-		control->flags &= ~IEEE80211_TXCTL_NO_ACK;
-	tx->fragmented = local->fragmentation_threshold <
-		IEEE80211_MAX_FRAG_THRESHOLD && tx->u.tx.unicast &&
-		skb->len + FCS_LEN > local->fragmentation_threshold &&
-		(!local->ops->set_frag_threshold);
-	if (!tx->sta)
-		control->flags |= IEEE80211_TXCTL_CLEAR_DST_MASK;
-	else if (tx->sta->clear_dst_mask) {
-		control->flags |= IEEE80211_TXCTL_CLEAR_DST_MASK;
-		tx->sta->clear_dst_mask = 0;
-	}
-	hdrlen = ieee80211_get_hdrlen(tx->fc);
-	if (skb->len > hdrlen + sizeof(rfc1042_header) + 2) {
-		u8 *pos = &skb->data[hdrlen + sizeof(rfc1042_header)];
-		tx->ethertype = (pos[0] << 8) | pos[1];
-	}
-	control->flags |= IEEE80211_TXCTL_FIRST_FRAGMENT;
-
-	return res;
-}
-
-static int inline is_ieee80211_device(struct net_device *dev,
-				      struct net_device *master)
-{
-	return (wdev_priv(dev->ieee80211_ptr) ==
-		wdev_priv(master->ieee80211_ptr));
-}
-
-/* Device in tx->dev has a reference added; use dev_put(tx->dev) when
- * finished with it. */
-static int inline ieee80211_tx_prepare(struct ieee80211_txrx_data *tx,
-				       struct sk_buff *skb,
-				       struct net_device *mdev,
-				       struct ieee80211_tx_control *control)
-{
-	struct ieee80211_tx_packet_data *pkt_data;
-	struct net_device *dev;
-
-	pkt_data = (struct ieee80211_tx_packet_data *)skb->cb;
-	dev = dev_get_by_index(pkt_data->ifindex);
-	if (unlikely(dev && !is_ieee80211_device(dev, mdev))) {
-		dev_put(dev);
-		dev = NULL;
-	}
-	if (unlikely(!dev))
-		return -ENODEV;
-	__ieee80211_tx_prepare(tx, skb, dev, control);
-	return 0;
-}
-
-static inline int __ieee80211_queue_stopped(const struct ieee80211_local *local,
-					    int queue)
-{
-	return test_bit(IEEE80211_LINK_STATE_XOFF, &local->state[queue]);
-}
-
-static inline int __ieee80211_queue_pending(const struct ieee80211_local *local,
-					    int queue)
-{
-	return test_bit(IEEE80211_LINK_STATE_PENDING, &local->state[queue]);
-}
-
-#define IEEE80211_TX_OK		0
-#define IEEE80211_TX_AGAIN	1
-#define IEEE80211_TX_FRAG_AGAIN	2
-
-static int __ieee80211_tx(struct ieee80211_local *local, struct sk_buff *skb,
-			  struct ieee80211_txrx_data *tx)
-{
-	struct ieee80211_tx_control *control = tx->u.tx.control;
-	int ret, i;
-
-	if (!ieee80211_qdisc_installed(local->mdev) &&
-	    __ieee80211_queue_stopped(local, 0)) {
-		netif_stop_queue(local->mdev);
-		return IEEE80211_TX_AGAIN;
-	}
-	if (skb) {
-		ieee80211_dump_frame(local->mdev->name, "TX to low-level driver", skb);
-		ret = local->ops->tx(local_to_hw(local), skb, control);
-		if (ret)
-			return IEEE80211_TX_AGAIN;
-		local->mdev->trans_start = jiffies;
-		ieee80211_led_tx(local, 1);
-	}
-	if (tx->u.tx.extra_frag) {
-		control->flags &= ~(IEEE80211_TXCTL_USE_RTS_CTS |
-				    IEEE80211_TXCTL_USE_CTS_PROTECT |
-				    IEEE80211_TXCTL_CLEAR_DST_MASK |
-				    IEEE80211_TXCTL_FIRST_FRAGMENT);
-		for (i = 0; i < tx->u.tx.num_extra_frag; i++) {
-			if (!tx->u.tx.extra_frag[i])
-				continue;
-			if (__ieee80211_queue_stopped(local, control->queue))
-				return IEEE80211_TX_FRAG_AGAIN;
-			if (i == tx->u.tx.num_extra_frag) {
-				control->tx_rate = tx->u.tx.last_frag_hwrate;
-				control->rate = tx->u.tx.last_frag_rate;
-				if (tx->u.tx.probe_last_frag)
-					control->flags |=
-						IEEE80211_TXCTL_RATE_CTRL_PROBE;
-				else
-					control->flags &=
-						~IEEE80211_TXCTL_RATE_CTRL_PROBE;
-			}
-
-			ieee80211_dump_frame(local->mdev->name,
-					     "TX to low-level driver",
-					     tx->u.tx.extra_frag[i]);
-			ret = local->ops->tx(local_to_hw(local),
-					    tx->u.tx.extra_frag[i],
-					    control);
-			if (ret)
-				return IEEE80211_TX_FRAG_AGAIN;
-			local->mdev->trans_start = jiffies;
-			ieee80211_led_tx(local, 1);
-			tx->u.tx.extra_frag[i] = NULL;
-		}
-		kfree(tx->u.tx.extra_frag);
-		tx->u.tx.extra_frag = NULL;
-	}
-	return IEEE80211_TX_OK;
-}
-
-static int ieee80211_tx(struct net_device *dev, struct sk_buff *skb,
-			struct ieee80211_tx_control *control, int mgmt)
-{
-	struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
-	struct sta_info *sta;
-	ieee80211_tx_handler *handler;
-	struct ieee80211_txrx_data tx;
-	ieee80211_txrx_result res = TXRX_DROP, res_prepare;
-	int ret, i;
-
-	WARN_ON(__ieee80211_queue_pending(local, control->queue));
-
-	if (unlikely(skb->len < 10)) {
-		dev_kfree_skb(skb);
-		return 0;
-	}
-
-	res_prepare = __ieee80211_tx_prepare(&tx, skb, dev, control);
-
-	if (res_prepare == TXRX_DROP) {
-		dev_kfree_skb(skb);
-		return 0;
-	}