drivers/staging/rtl8192e/rtllib_tx.c

// SPDX-License-Identifier: GPL-2.0
/*
 * Copyright(c) 2003 - 2004 Intel Corporation. All rights reserved.
 *
 * Contact Information:
 * James P. Ketrenos <ipw2100-admin@linux.intel.com>
 * Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
 *
 * Few modifications for Realtek's Wi-Fi drivers by
 * Andrea Merello <andrea.merello@gmail.com>
 *
 * A special thanks goes to Realtek for their support !
 */
#include <linux/compiler.h>
#include <linux/errno.h>
#include <linux/if_arp.h>
#include <linux/in6.h>
#include <linux/in.h>
#include <linux/ip.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/netdevice.h>
#include <linux/pci.h>
#include <linux/proc_fs.h>
#include <linux/skbuff.h>
#include <linux/slab.h>
#include <linux/tcp.h>
#include <linux/types.h>
#include <linux/wireless.h>
#include <linux/etherdevice.h>
#include <linux/uaccess.h>
#include <linux/if_vlan.h>

#include "rtllib.h"

/* 802.11 Data Frame
 *
 *
 * 802.11 frame_control for data frames - 2 bytes
 *      ,--------------------------------------------------------------------.
 * bits | 0 | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 |  9 |  a |  b  |  c  |  d  | e  |
 *      |---|---|---|---|---|---|---|---|---|----|----|-----|-----|-----|----|
 * val  | 0 | 0 | 0 | 1 | x | 0 | 0 | 0 | 1 |  0 |  x |  x  |  x  |  x  | x  |
 *      |---|---|---|---|---|---|---|---|---|----|----|-----|-----|-----|----|
 * desc |  ver  | type  |  ^-subtype-^  |to |from|more|retry| pwr |more |wep |
 *      |       |       | x=0 data      |DS | DS |frag|     | mgm |data |    |
 *      |       |       | x=1 data+ack  |   |    |    |     |     |     |    |
 *      '--------------------------------------------------------------------'
 *                                           /\
 *                                           |
 * 802.11 Data Frame                         |
 *          ,--------- 'ctrl' expands to >---'
 *          |
 *       ,--'---,-------------------------------------------------------------.
 * Bytes |  2   |  2   |    6    |    6    |    6    |  2   | 0..2312 |   4  |
 *       |------|------|---------|---------|---------|------|---------|------|
 * Desc. | ctrl | dura |  DA/RA  |   TA    |    SA   | Sequ |  Frame  |  fcs |
 *       |      | tion | (BSSID) |         |         | ence |  data   |      |
 *       `--------------------------------------------------|         |------'
 * Total: 28 non-data bytes                                 `----.----'
 *                                                               |
 *        .- 'Frame data' expands to <---------------------------'
 *        |
 *        V
 *       ,---------------------------------------------------.
 * Bytes |  1   |  1   |    1    |    3     |  2   |  0-2304 |
 *       |------|------|---------|----------|------|---------|
 * Desc. | SNAP | SNAP | Control |Eth Tunnel| Type | IP      |
 *       | DSAP | SSAP |         |          |      | Packet  |
 *       | 0xAA | 0xAA |0x03 (UI)|0x00-00-F8|      |         |
 *       `-----------------------------------------|         |
 * Total: 8 non-data bytes                         `----.----'
 *                                                      |
 *        .- 'IP Packet' expands, if WEP enabled, to <--'
 *        |
 *        V
 *       ,-----------------------.
 * Bytes |  4  |   0-2296  |  4  |
 *       |-----|-----------|-----|
 * Desc. | IV  | Encrypted | ICV |
 *       |     | IP Packet |     |
 *       `-----------------------'
 * Total: 8 non-data bytes
 *
 *
 * 802.3 Ethernet Data Frame
 *
 *       ,-----------------------------------------.
 * Bytes |   6   |   6   |  2   |  Variable |   4  |
 *       |-------|-------|------|-----------|------|
 * Desc. | Dest. | Source| Type | IP Packet |  fcs |
 *       |  MAC  |  MAC  |      |	   |      |
 *       `-----------------------------------------'
 * Total: 18 non-data bytes
 *
 * In the event that fragmentation is required, the incoming payload is split
 * into N parts of size ieee->fts.  The first fragment contains the SNAP header
 * and the remaining packets are just data.
 *
 * If encryption is enabled, each fragment payload size is reduced by enough
 * space to add the prefix and postfix (IV and ICV totalling 8 bytes in
 * the case of WEP) So if you have 1500 bytes of payload with ieee->fts set to
 * 500 without encryption it will take 3 frames.  With WEP it will take 4 frames
 * as the payload of each frame is reduced to 492 bytes.
 *
 * SKB visualization
 *
 * ,- skb->data
 * |
 * |    ETHERNET HEADER        ,-<-- PAYLOAD
 * |                           |     14 bytes from skb->data
 * |  2 bytes for Type --> ,T. |     (sizeof ethhdr)
 * |                       | | |
 * |,-Dest.--. ,--Src.---. | | |
 * |  6 bytes| | 6 bytes | | | |
 * v         | |         | | | |
 * 0         | v       1 | v | v           2
 * 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5
 *     ^     | ^         | ^ |
 *     |     | |         | | |
 *     |     | |         | `T' <---- 2 bytes for Type
 *     |     | |         |
 *     |     | '---SNAP--' <-------- 6 bytes for SNAP
 *     |     |
 *     `-IV--' <-------------------- 4 bytes for IV (WEP)
 *
 *      SNAP HEADER
 *
 */

static u8 P802_1H_OUI[P80211_OUI_LEN] = { 0x00, 0x00, 0xf8 };
static u8 RFC1042_OUI[P80211_OUI_LEN] = { 0x00, 0x00, 0x00 };

static int rtllib_put_snap(u8 *data, u16 h_proto)
{
	struct rtllib_snap_hdr *snap;
	u8 *oui;

	snap = (struct rtllib_snap_hdr *)data;
	snap->dsap = 0xaa;
	snap->ssap = 0xaa;
	snap->ctrl = 0x03;

	if (h_proto == 0x8137 || h_proto == 0x80f3)
		oui = P802_1H_OUI;
	else
		oui = RFC1042_OUI;
	snap->oui[0] = oui[0];
	snap->oui[1] = oui[1];
	snap->oui[2] = oui[2];

	*(__be16 *)(data + SNAP_SIZE) = htons(h_proto);

	return SNAP_SIZE + sizeof(u16);
}

int rtllib_encrypt_fragment(struct rtllib_device *ieee, struct sk_buff *frag,
			    int hdr_len)
{
	struct lib80211_crypt_data *crypt = NULL;
	int res;

	crypt = ieee->crypt_info.crypt[ieee->crypt_info.tx_keyidx];

	if (!(crypt && crypt->ops)) {
		netdev_info(ieee->dev, "=========>%s(), crypt is null\n",
			    __func__);
		return -1;
	}
	/* To encrypt, frame format is:
	 * IV (4 bytes), clear payload (including SNAP), ICV (4 bytes)
	 */

	/* Host-based IEEE 802.11 fragmentation for TX is not yet supported, so
	 * call both MSDU and MPDU encryption functions from here.
	 */
	atomic_inc(&crypt->refcnt);
	res = 0;
	if (crypt->ops->encrypt_msdu)
		res = crypt->ops->encrypt_msdu(frag, hdr_len, crypt->priv);
	if (res == 0 && crypt->ops->encrypt_mpdu)
		res = crypt->ops->encrypt_mpdu(frag, hdr_len, crypt->priv);

	atomic_dec(&crypt->refcnt);
	if (res < 0) {
		netdev_info(ieee->dev, "%s: Encryption failed: len=%d.\n",
			    ieee->dev->name, frag->len);
		return -1;
	}

	return 0;
}


void rtllib_txb_free(struct rtllib_txb *txb)
{
	if (unlikely(!txb))
		return;
	kfree(txb);
}

static struct rtllib_txb *rtllib_alloc_txb(int nr_frags, int txb_size,
					   gfp_t gfp_mask)
{
	struct rtllib_txb *txb;
	int i;

	txb = kmalloc(sizeof(struct rtllib_txb) + (sizeof(u8 *) * nr_frags),
		      gfp_mask);
	if (!txb)
		return NULL;

	memset(txb, 0, sizeof(struct rtllib_txb));
	txb->nr_frags = nr_frags;
	txb->frag_size = cpu_to_le16(txb_size);

	for (i = 0; i < nr_frags; i++) {
		txb->fragments[i] = dev_alloc_skb(txb_size);
		if (unlikely(!txb->fragments[i])) {
			i--;
			break;
		}
		memset(txb->fragments[i]->cb, 0, sizeof(txb->fragments[i]->cb));
	}
	if (unlikely(i != nr_frags)) {
		while (i >= 0)
			dev_kfree_skb_any(txb->fragments[i--]);
		kfree(txb);
		return NULL;
	}
	return txb;
}

static int rtllib_classify(struct sk_buff *skb, u8 bIsAmsdu)
{
	struct ethhdr *eth;
	struct iphdr *ip;

	eth = (struct ethhdr *)skb->data;
	if (eth->h_proto != htons(ETH_P_IP))
		return 0;

#ifdef VERBOSE_DEBUG
	print_hex_dump_bytes("%s: ", __func__, DUMP_PREFIX_NONE, skb->data,
			     skb->len);
#endif
	ip = ip_hdr(skb);
	switch (ip->tos & 0xfc) {
	case 0x20:
		return 2;
	case 0x40:
		return 1;
	case 0x60:
		return 3;
	case 0x80:
		return 4;
	case 0xa0:
		return 5;
	case 0xc0:
		return 6;
	case 0xe0:
		return 7;
	default:
		return 0;
	}
}

static void rtllib_tx_query_agg_cap(struct rtllib_device *ieee,
				    struct sk_buff *skb,
				    struct cb_desc *tcb_desc)
{
	struct rt_hi_throughput *pHTInfo = ieee->pHTInfo;
	struct tx_ts_record *pTxTs = NULL;
	struct rtllib_hdr_1addr *hdr = (struct rtllib_hdr_1addr *)skb->data;

	if (rtllib_act_scanning(ieee, false))
		return;

	if (!pHTInfo->bCurrentHTSupport || !pHTInfo->bEnableHT)
		return;
	if (!IsQoSDataFrame(skb->data))
		return;
	if (is_multicast_ether_addr(hdr->addr1))
		return;

	if (tcb_desc->bdhcp || ieee->CntAfterLink < 2)
		return;

	if (pHTInfo->IOTAction & HT_IOT_ACT_TX_NO_AGGREGATION)
		return;

	if (!ieee->GetNmodeSupportBySecCfg(ieee->dev))
		return;
	if (pHTInfo->bCurrentAMPDUEnable) {
		if (!GetTs(ieee, (struct ts_common_info **)(&pTxTs), hdr->addr1,
		    skb->priority, TX_DIR, true)) {
			netdev_info(ieee->dev, "%s: can't get TS\n", __func__);
			return;
		}
		if (!pTxTs->TxAdmittedBARecord.b_valid) {
			if (ieee->wpa_ie_len && (ieee->pairwise_key_type ==
			    KEY_TYPE_NA)) {
				;
			} else if (tcb_desc->bdhcp == 1) {
				;
			} else if (!pTxTs->bDisable_AddBa) {
				TsStartAddBaProcess(ieee, pTxTs);
			}
			goto FORCED_AGG_SETTING;
		} else if (!pTxTs->bUsingBa) {
			if (SN_LESS(pTxTs->TxAdmittedBARecord.ba_start_seq_ctrl.field.seq_num,
			   (pTxTs->TxCurSeq+1)%4096))
				pTxTs->bUsingBa = true;
			else
				goto FORCED_AGG_SETTING;
		}
		if (ieee->iw_mode == IW_MODE_INFRA) {
			tcb_desc->bAMPDUEnable = true;
			tcb_desc->ampdu_factor = pHTInfo->CurrentAMPDUFactor;
			tcb_desc->ampdu_density = pHTInfo->CurrentMPDUDensity;
		}
	}
FORCED_AGG_SETTING:
	switch (pHTInfo->ForcedAMPDUMode) {
	case HT_AGG_AUTO:
		break;

	case HT_AGG_FORCE_ENABLE:
		tcb_desc->bAMPDUEnable = true;
		tcb_desc->ampdu_density = pHTInfo->ForcedMPDUDensity;
		tcb_desc->ampdu_factor = pHTInfo->ForcedAMPDUFactor;
		break;

	case HT_AGG_FORCE_DISABLE:
		tcb_desc->bAMPDUEnable = false;
		tcb_desc->ampdu_density = 0;
		tcb_desc->ampdu_factor = 0;
		break;
	}
}

static void rtllib_query_ShortPreambleMode(struct rtllib_device *ieee,
					   struct cb_desc *tcb_desc)
{
	tcb_desc->bUseShortPreamble = false;
	if (tcb_desc->data_rate == 2)
		return;
	else if (ieee->current_network.capability &
		 WLAN_CAPABILITY_SHORT_PREAMBLE)
		tcb_desc->bUseShortPreamble = true;
}

static void rtllib_query_HTCapShortGI(struct rtllib_device *ieee,
				      struct cb_desc *tcb_desc)
{
	struct rt_hi_throughput *pHTInfo = ieee->pHTInfo;

	tcb_desc->bUseShortGI		= false;

	if (!pHTInfo->bCurrentHTSupport || !pHTInfo->bEnableHT)
		return;

	if (pHTInfo->bForcedShortGI) {
		tcb_desc->bUseShortGI = true;
		return;
	}

	if (pHTInfo->bCurBW40MHz && pHTInfo->bCurShortGI40MHz)
		tcb_desc->bUseShortGI = true;
	else if (!pHTInfo->bCurBW40MHz && pHTInfo->bCurShortGI20MHz)
		tcb_desc->bUseShortGI = true;
}

static void rtllib_query_BandwidthMode(struct rtllib_device *ieee,
				       struct cb_desc *tcb_desc)
{
	struct rt_hi_throughput *pHTInfo = ieee->pHTInfo;

	tcb_desc->bPacketBW = false;

	if (!pHTInfo->bCurrentHTSupport || !pHTInfo->bEnableHT)
		return;

	if (tcb_desc->bMulticast || tcb_desc->bBroadcast)
		return;

	if ((tcb_desc->data_rate & 0x80) == 0)
		return;
	if (pHTInfo->bCurBW40MHz && pHTInfo->bCurTxBW40MHz &&
	    !ieee->bandwidth_auto_switch.bforced_tx20Mhz)
		tcb_desc->bPacketBW = true;
}

static void rtllib_query_protectionmode(struct rtllib_device *ieee,
					struct cb_desc *tcb_desc,
					struct sk_buff *skb)
{
	struct rt_hi_throughput *pHTInfo;

	tcb_desc->bRTSSTBC			= false;
	tcb_desc->bRTSUseShortGI		= false;
	tcb_desc->bCTSEnable			= false;
	tcb_desc->RTSSC				= 0;
	tcb_desc->bRTSBW			= false;

	if (tcb_desc->bBroadcast || tcb_desc->bMulticast)
		return;

	if (is_broadcast_ether_addr(skb->data+16))
		return;

	if (ieee->mode < IEEE_N_24G) {
		if (skb->len > ieee->rts) {
			tcb_desc->bRTSEnable = true;
			tcb_desc->rts_rate = MGN_24M;
		} else if (ieee->current_network.buseprotection) {
			tcb_desc->bRTSEnable = true;
			tcb_desc->bCTSEnable = true;
			tcb_desc->rts_rate = MGN_24M;
		}
		return;
	}

	pHTInfo = ieee->pHTInfo;

	while (true) {
		if (pHTInfo->IOTAction & HT_IOT_ACT_FORCED_CTS2SELF) {
			tcb_desc->bCTSEnable	= true;
			tcb_desc->rts_rate  =	MGN_24M;
			tcb_desc->bRTSEnable = true;
			break;
		} else if (pHTInfo->IOTAction & (HT_IOT_ACT_FORCED_RTS |
			   HT_IOT_ACT_PURE_N_MODE)) {
			tcb_desc->bRTSEnable = true;
			tcb_desc->rts_rate  =	MGN_24M;
			break;
		}
		if (ieee->current_network.buseprotection) {
			tcb_desc->bRTSEnable = true;
			tcb_desc->bCTSEnable = true;
			tcb_desc->rts_rate = MGN_24M;
			break;
		}
		if (pHTInfo->bCurrentHTSupport  && pHTInfo->bEnableHT) {
			u8 HTOpMode = pHTInfo->CurrentOpMode;

			if ((pHTInfo->bCurBW40MHz && (HTOpMode == 2 ||
			     HTOpMode == 3)) ||
			     (!pHTInfo->bCurBW40MHz && HTOpMode == 3)) {
				tcb_desc->rts_rate = MGN_24M;
				tcb_desc->bRTSEnable = true;
				break;
			}
		}
		if (skb->len > ieee->rts) {
			tcb_desc->rts_rate = MGN_24M;
			tcb_desc->bRTSEnable = true;
			break;
		}
		if (tcb_desc->bAMPDUEnable) {
			tcb_desc->rts_rate = MGN_24M;
			tcb_desc->bRTSEnable = false;
			break;
		}
		goto NO_PROTECTION;
	}
	if (ieee->current_network.capability & WLAN_CAPABILITY_SHORT_PREAMBLE)
		tcb_desc->bUseShortPreamble = true;
	if (ieee->iw_mode == IW_MODE_MASTER)
		goto NO_PROTECTION;
	return;
NO_PROTECTION:
	tcb_desc->bRTSEnable	= false;
	tcb_desc->bCTSEnable	= false;
	tcb_desc->rts_rate	= 0;
	tcb_desc->RTSSC		= 0;
	tcb_desc->bRTSBW	= false;
}


static void rtllib_txrate_selectmode(struct rtllib_device *ieee,
				     struct cb_desc *tcb_desc)
{
	if (ieee->bTxDisableRateFallBack)
		tcb_desc->bTxDisableRateFallBack = true;

	if (ieee->bTxUseDriverAssingedRate)
		tcb_desc->bTxUseDriverAssingedRate = true;
	if (!tcb_desc->bTxDisableRateFallBack ||
	    !tcb_desc->bTxUseDriverAssingedRate) {
		if (ieee->iw_mode == IW_MODE_INFRA ||
		    ieee->iw_mode == IW_MODE_ADHOC)
			tcb_desc->RATRIndex = 0;
	}
}

static u16 rtllib_query_seqnum(struct rtllib_device *ieee, struct sk_buff *skb,
			       u8 *dst)
{
	u16 seqnum = 0;

	if (is_multicast_ether_addr(dst))
		return 0;
	if (IsQoSDataFrame(skb->data)) {
		struct tx_ts_record *pTS = NULL;

		if (!GetTs(ieee, (struct ts_common_info **)(&pTS), dst,
		    skb->priority, TX_DIR, true))
			return 0;
		seqnum = pTS->TxCurSeq;
		pTS->TxCurSeq = (pTS->TxCurSeq+1)%4096;
		return seqnum;
	}
	return 0;
}

static int wme_downgrade_ac(struct sk_buff *skb)
{
	switch (skb->priority) {
	case 6:
	case 7:
		skb->priority = 5; /* VO -> VI */
		return 0;
	case 4:
	case 5:
		skb->priority = 3; /* VI -> BE */
		return 0;
	case 0:
	case 3:
		skb->priority = 1; /* BE -> BK */
		return 0;
	default:
		return -1;
	}
}

static u8 rtllib_current_rate(struct rtllib_device *ieee)
{
	if (ieee->mode & IEEE_MODE_MASK)
		return ieee->rate;

	if (ieee->HTCurrentOperaRate)
		return ieee->HTCurrentOperaRate;
	else
		return ieee->rate & 0x7F;
}

static int rtllib_xmit_inter(struct sk_buff *skb, struct net_device *dev)
{
	struct rtllib_device *ieee = (struct rtllib_device *)
				     netdev_priv_rsl(dev);
	struct rtllib_txb *txb = NULL;
	struct rtllib_hdr_3addrqos *frag_hdr;
	int i, bytes_per_frag, nr_frags, bytes_last_frag, frag_size;
	unsigned long flags;
	struct net_device_stats *stats = &ieee->stats;
	int ether_type = 0, encrypt;
	int bytes, fc, qos_ctl = 0, hdr_len;
	struct sk_buff *skb_frag;
	struct rtllib_hdr_3addrqos header = { /* Ensure zero initialized */
		.duration_id = 0,
		.seq_ctl = 0,
		.qos_ctl = 0
	};
	int qos_activated = ieee->current_network.qos_data.active;
	u8 dest[ETH_ALEN];
	u8 src[ETH_ALEN];
	struct lib80211_crypt_data *crypt = NULL;
	struct cb_desc *tcb_desc;
	u8 bIsMulticast = false;
	u8 IsAmsdu = false;
	bool	bdhcp = false;

	spin_lock_irqsave(&ieee->lock, flags);

	/* If there is no driver handler to take the TXB, don't bother
	 * creating it...
	 */
	if ((!ieee->hard_start_xmit && !(ieee->softmac_features &
	   IEEE_SOFTMAC_TX_QUEUE)) ||
	   ((!ieee->softmac_data_hard_start_xmit &&
	   (ieee->softmac_features & IEEE_SOFTMAC_TX_QUEUE)))) {
		netdev_warn(ieee->dev, "No xmit handler.\n");
		goto success;
	}


	if (likely(ieee->raw_tx == 0)) {
		if (unlikely(skb->len < SNAP_SIZE + sizeof(u16))) {
			netdev_warn(ieee->dev, "skb too small (%d).\n",
				    skb->len);
			goto success;
		}
		/* Save source and destination addresses */
		ether_addr_copy(dest, skb->data);
		ether_addr_copy(src, skb->data + ETH_ALEN);

		memset(skb->cb, 0, sizeof(skb->cb));
		ether_type = ntohs(((struct ethhdr *)skb->data)->h_proto);

		if (ieee->iw_mode == IW_MODE_MONITOR) {
			txb = rtllib_alloc_txb(1, skb->len, GFP_ATOMIC);
			if (unlikely(!txb)) {
				netdev_warn(ieee->dev,
					    "Could not allocate TXB\n");
				goto failed;
			}

			txb->encrypted = 0;
			txb->payload_size = cpu_to_le16(skb->len);
			skb_put_data(txb->fragments[0], skb->data, skb->len);

			goto success;
		}

		if (skb->len > 282) {
			if (ether_type == ETH_P_IP) {
				const struct iphdr *ip = (struct iphdr *)
					((u8 *)skb->data+14);
				if (ip->protocol == IPPROTO_UDP) {
					struct udphdr *udp;

					udp = (struct udphdr *)((u8 *)ip +
					      (ip->ihl << 2));
					if (((((u8 *)udp)[1] == 68) &&
					   (((u8 *)udp)[3] == 67)) ||
					   ((((u8 *)udp)[1] == 67) &&
					   (((u8 *)udp)[3] == 68))) {
						bdhcp = true;
						ieee->LPSDelayCnt = 200;
					}
				}
			} else if (ether_type == ETH_P_ARP) {
				netdev_info(ieee->dev,
					    "=================>DHCP Protocol start tx ARP pkt!!\n");
				bdhcp = true;
				ieee->LPSDelayCnt =
					 ieee->current_network.tim.tim_count;
			}
		}

		skb->priority = rtllib_classify(skb, IsAmsdu);
		crypt = ieee->crypt_info.crypt[ieee->crypt_info.tx_keyidx];
		encrypt = !(ether_type == ETH_P_PAE && ieee->ieee802_1x) &&
			ieee->host_encrypt && crypt && crypt->ops;
		if (!encrypt && ieee->ieee802_1x &&
		    ieee->drop_unencrypted && ether_type != ETH_P_PAE) {
			stats->tx_dropped++;
			goto success;
		}
		if (crypt && !encrypt && ether_type == ETH_P_PAE) {
			struct eapol *eap = (struct eapol *)(skb->data +
				sizeof(struct ethhdr) - SNAP_SIZE -
				sizeof(u16));
			netdev_dbg(ieee->dev,
				   "TX: IEEE 802.11 EAPOL frame: %s\n",
				   eap_get_type(eap->type));
		}

		/* Advance the SKB to the start of the payload */
		skb_pull(skb, sizeof(struct ethhdr));

		/* Determine total amount of storage required for TXB packets */
		bytes = skb->len + SNAP_SIZE + sizeof(u16);

		if (encrypt)
			fc = RTLLIB_FTYPE_DATA | RTLLIB_FCTL_WEP;
		else
			fc = RTLLIB_FTYPE_DATA;

		if (qos_activated)
			fc |= RTLLIB_STYPE_QOS_DATA;
		else
			fc |= RTLLIB_STYPE_DATA;

		if (ieee->iw_mode == IW_MODE_INFRA) {
			fc |= RTLLIB_FCTL_TODS;
			/* To DS: Addr1 = BSSID, Addr2 = SA,
			 * Addr3 = DA
			 */
			ether_addr_copy(header.addr1,
					ieee->current_network.bssid);
			ether_addr_copy(header.addr2, src);
			if (IsAmsdu)
				ether_addr_copy(header.addr3,
						ieee->current_network.bssid);
			else
				ether_addr_copy(header.addr3, dest);
		} else if (ieee->iw_mode == IW_MODE_ADHOC) {
			/* not From/To DS: Addr1 = DA, Addr2 = SA,
			 * Addr3 = BSSID
			 */
			ether_addr_copy(header.addr1, dest);
			ether_addr_copy(header.addr2, src);
			ether_addr_copy(header.addr3,
					ieee->current_network.bssid);
		}

		bIsMulticast = is_multicast_ether_addr(header.addr1);

		header.frame_ctl = cpu_to_le16(fc);

		/* Determine fragmentation size based on destination (multicast
		 * and broadcast are not fragmented)
		 */
		if (bIsMulticast) {
			frag_size = MAX_FRAG_THRESHOLD;
			qos_ctl |= QOS_CTL_NOTCONTAIN_ACK;
		} else {
			frag_size = ieee->fts;
			qos_ctl = 0;
		}

		if (qos_activated) {
			hdr_len = RTLLIB_3ADDR_LEN + 2;

			/* in case we are a client verify acm is not set for this ac */
			while (unlikely(ieee->wmm_acm & (0x01 << skb->priority))) {
				netdev_info(ieee->dev, "skb->priority = %x\n",
						skb->priority);
				if (wme_downgrade_ac(skb))
					break;
				netdev_info(ieee->dev, "converted skb->priority = %x\n",
					   skb->priority);
			}

			qos_ctl |= skb->priority;
			header.qos_ctl = cpu_to_le16(qos_ctl & RTLLIB_QOS_TID);

		} else {
			hdr_len = RTLLIB_3ADDR_LEN;
		}
		/* Determine amount of payload per fragment.  Regardless of if
		 * this stack is providing the full 802.11 header, one will
		 * eventually be affixed to this fragment -- so we must account
		 * for it when determining the amount of payload space.
		 */
		bytes_per_frag = frag_size - hdr_len;
		if (ieee->config &
		   (CFG_RTLLIB_COMPUTE_FCS | CFG_RTLLIB_RESERVE_FCS))
			bytes_per_frag -= RTLLIB_FCS_LEN;

		/* Each fragment may need to have room for encrypting
		 * pre/postfix
		 */
		if (encrypt) {
			bytes_per_frag -= crypt->ops->extra_mpdu_prefix_len +
				crypt->ops->extra_mpdu_postfix_len +
				crypt->ops->extra_msdu_prefix_len +
				crypt->ops->extra_msdu_postfix_len;
		}
		/* Number of fragments is the total bytes_per_frag /
		 * payload_per_fragment
		 */
		nr_frags = bytes / bytes_per_frag;
		bytes_last_frag = bytes % bytes_per_frag;
		if (bytes_last_frag)
			nr_frags++;
		else
			bytes_last_frag = bytes_per_frag;

		/* When we allocate the TXB we allocate enough space for the
		 * reserve and full fragment bytes (bytes_per_frag doesn't
		 * include prefix, postfix, header, FCS, etc.)
		 */
		txb = rtllib_alloc_txb(nr_frags, frag_size +
				       ieee->tx_headroom, GFP_ATOMIC);
		if (unlikely(!txb)) {
			netdev_warn(ieee->dev, "Could not allocate TXB\n");
			goto failed;
		}
		txb->encrypted = encrypt;
		txb->payload_size = cpu_to_le16(bytes);

		if (qos_activated)
			txb->queue_index = UP2AC(skb->priority);
		else
			txb->queue_index = WME_AC_BE;

		for (i = 0; i < nr_frags; i++) {
			skb_frag = txb->fragments[i];
			tcb_desc = (struct cb_desc *)(skb_frag->cb +
				    MAX_DEV_ADDR_SIZE);
			if (qos_activated) {
				skb_frag->priority = skb->priority;
				tcb_desc->queue_index =  UP2AC(skb->priority);
			} else {
				skb_frag->priority = WME_AC_BE;
				tcb_desc->queue_index = WME_AC_BE;
			}
			skb_reserve(skb_frag, ieee->tx_headroom);

			if (encrypt) {
				if (ieee->hwsec_active)
					tcb_desc->bHwSec = 1;
				else
					tcb_desc->bHwSec = 0;
				skb_reserve(skb_frag,
					    crypt->ops->extra_mpdu_prefix_len +
					    crypt->ops->extra_msdu_prefix_len);
			} else {
				tcb_desc->bHwSec = 0;
			}
			frag_hdr = skb_put_data(skb_frag, &header, hdr_len);

			/* If this is not the last fragment, then add the
			 * MOREFRAGS bit to the frame control
			 */
			if (i != nr_frags - 1) {
				frag_hdr->frame_ctl = cpu_to_le16(
					fc | RTLLIB_FCTL_MOREFRAGS);
				bytes = bytes_per_frag;

			} else {
				/* The last fragment has the remaining length */
				bytes = bytes_last_frag;
			}
			if ((qos_activated) && (!bIsMulticast)) {
				frag_hdr->seq_ctl =
					 cpu_to_le16(rtllib_query_seqnum(ieee, skb_frag,
							     header.addr1));
				frag_hdr->seq_ctl =
					 cpu_to_le16(le16_to_cpu(frag_hdr->seq_ctl)<<4 | i);
			} else {
				frag_hdr->seq_ctl =
					 cpu_to_le16(ieee->seq_ctrl[0]<<4 | i);
			}
			/* Put a SNAP header on the first fragment */
			if (i == 0) {
				rtllib_put_snap(
					skb_put(skb_frag, SNAP_SIZE +
					sizeof(u16)), ether_type);
				bytes -= SNAP_SIZE + sizeof(u16);
			}

			skb_put_data(skb_frag, skb->data, bytes);

			/* Advance the SKB... */
			skb_pull(skb, bytes);

			/* Encryption routine will move the header forward in
			 * order to insert the IV between the header and the
			 * payload
			 */
			if (encrypt)
				rtllib_encrypt_fragment(ieee, skb_frag,
							hdr_len);
			if (ieee->config &
			   (CFG_RTLLIB_COMPUTE_FCS | CFG_RTLLIB_RESERVE_FCS))
				skb_put(skb_frag, 4);
		}

		if ((qos_activated) && (!bIsMulticast)) {
			if (ieee->seq_ctrl[UP2AC(skb->priority) + 1] == 0xFFF)
				ieee->seq_ctrl[UP2AC(skb->priority) + 1] = 0;
			else
				ieee->seq_ctrl[UP2AC(skb->priority) + 1]++;
		} else {
			if (ieee->seq_ctrl[0] == 0xFFF)
				ieee->seq_ctrl[0] = 0;
			else
				ieee->seq_ctrl[0]++;
		}
	} else {
		if (unlikely(skb->len < sizeof(struct rtllib_hdr_3addr))) {
			netdev_warn(ieee->dev, "skb too small (%d).\n",
				    skb->len);
			goto success;
		}

		txb = rtllib_alloc_txb(1, skb->len, GFP_ATOMIC);
		if (!txb) {
			netdev_warn(ieee->dev, "Could not allocate TXB\n");
			goto failed;
		}

		txb->encrypted = 0;
		txb->payload_size = cpu_to_le16(skb->len);
		skb_put_data(txb->fragments[0], skb->data, skb->len);
	}

 success:
	if (txb) {
		tcb_desc = (struct cb_desc *)
				(txb->fragments[0]->cb + MAX_DEV_ADDR_SIZE);
		tcb_desc->bTxEnableFwCalcDur = 1;
		tcb_desc->priority = skb->priority;

		if (ether_type == ETH_P_PAE) {
			if (ieee->pHTInfo->IOTAction &
			    HT_IOT_ACT_WA_IOT_Broadcom) {
				tcb_desc->data_rate =
					 MgntQuery_TxRateExcludeCCKRates(ieee);
				tcb_desc->bTxDisableRateFallBack = false;
			} else {
				tcb_desc->data_rate = ieee->basic_rate;
				tcb_desc->bTxDisableRateFallBack = 1;
			}


			tcb_desc->RATRIndex = 7;
			tcb_desc->bTxUseDriverAssingedRate = 1;
		} else {
			if (is_multicast_ether_addr(header.addr1))
				tcb_desc->bMulticast = 1;
			if (is_broadcast_ether_addr(header.addr1))
				tcb_desc->bBroadcast = 1;
			rtllib_txrate_selectmode(ieee, tcb_desc);
			if (tcb_desc->bMulticast ||  tcb_desc->bBroadcast)
				tcb_desc->data_rate = ieee->basic_rate;
			else
				tcb_desc->data_rate = rtllib_current_rate(ieee);

			if (bdhcp) {
				if (ieee->pHTInfo->IOTAction &
				    HT_IOT_ACT_WA_IOT_Broadcom) {
					tcb_desc->data_rate =
					   MgntQuery_TxRateExcludeCCKRates(ieee);
					tcb_desc->bTxDisableRateFallBack = false;
				} else {
					tcb_desc->data_rate = MGN_1M;
					tcb_desc->bTxDisableRateFallBack = 1;
				}


				tcb_desc->RATRIndex = 7;
				tcb_desc->bTxUseDriverAssingedRate = 1;
				tcb_desc->bdhcp = 1;
			}

			rtllib_query_ShortPreambleMode(ieee, tcb_desc);
			rtllib_tx_query_agg_cap(ieee, txb->fragments[0],
						tcb_desc);
			rtllib_query_HTCapShortGI(ieee, tcb_desc);
			rtllib_query_BandwidthMode(ieee, tcb_desc);
			rtllib_query_protectionmode(ieee, tcb_desc,
						    txb->fragments[0]);
		}
	}
	spin_unlock_irqrestore(&ieee->lock, flags);
	dev_kfree_skb_any(skb);
	if (txb) {
		if (ieee->softmac_features & IEEE_SOFTMAC_TX_QUEUE) {
			dev->stats.tx_packets++;
			dev->stats.tx_bytes += le16_to_cpu(txb->payload_size);
			rtllib_softmac_xmit(txb, ieee);
		} else {
			if ((*ieee->hard_start_xmit)(txb, dev) == 0) {
				stats->tx_packets++;
				stats->tx_bytes += le16_to_cpu(txb->payload_size);
				return 0;
			}
			rtllib_txb_free(txb);
		}
	}

	return 0;

 failed:
	spin_unlock_irqrestore(&ieee->lock, flags);
	netif_stop_queue(dev);
	stats->tx_errors++;
	return 1;

}

int rtllib_xmit(struct sk_buff *skb, struct net_device *dev)
{
	memset(skb->cb, 0, sizeof(skb->cb));
	return rtllib_xmit_inter(skb, dev);
}
EXPORT_SYMBOL(rtllib_xmit);