[net-next-2.6.git] / drivers / net / wireless / hostap / hostap_80211_tx.c

#include <linux/slab.h>

#include "hostap_80211.h"
#include "hostap_common.h"
#include "hostap_wlan.h"
#include "hostap.h"
#include "hostap_ap.h"

/* See IEEE 802.1H for LLC/SNAP encapsulation/decapsulation */
/* Ethernet-II snap header (RFC1042 for most EtherTypes) */
static unsigned char rfc1042_header[] =
{ 0xaa, 0xaa, 0x03, 0x00, 0x00, 0x00 };
/* Bridge-Tunnel header (for EtherTypes ETH_P_AARP and ETH_P_IPX) */
static unsigned char bridge_tunnel_header[] =
{ 0xaa, 0xaa, 0x03, 0x00, 0x00, 0xf8 };
/* No encapsulation header if EtherType < 0x600 (=length) */

void hostap_dump_tx_80211(const char *name, struct sk_buff *skb)
{
	struct ieee80211_hdr *hdr;
	u16 fc;

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

	printk(KERN_DEBUG "%s: TX len=%d jiffies=%ld\n",
	       name, skb->len, jiffies);

	if (skb->len < 2)
		return;

	fc = le16_to_cpu(hdr->frame_control);
	printk(KERN_DEBUG "   FC=0x%04x (type=%d:%d)%s%s",
	       fc, (fc & IEEE80211_FCTL_FTYPE) >> 2,
	       (fc & IEEE80211_FCTL_STYPE) >> 4,
	       fc & IEEE80211_FCTL_TODS ? " [ToDS]" : "",
	       fc & IEEE80211_FCTL_FROMDS ? " [FromDS]" : "");

	if (skb->len < IEEE80211_DATA_HDR3_LEN) {
		printk("\n");
		return;
	}

	printk(" dur=0x%04x seq=0x%04x\n", le16_to_cpu(hdr->duration_id),
	       le16_to_cpu(hdr->seq_ctrl));

	printk(KERN_DEBUG "   A1=%pM", hdr->addr1);
	printk(" A2=%pM", hdr->addr2);
	printk(" A3=%pM", hdr->addr3);
	if (skb->len >= 30)
		printk(" A4=%pM", hdr->addr4);
	printk("\n");
}


/* hard_start_xmit function for data interfaces (wlan#, wlan#wds#, wlan#sta)
 * Convert Ethernet header into a suitable IEEE 802.11 header depending on
 * device configuration. */
netdev_tx_t hostap_data_start_xmit(struct sk_buff *skb,
				   struct net_device *dev)
{
	struct hostap_interface *iface;
	local_info_t *local;
	int need_headroom, need_tailroom = 0;
	struct ieee80211_hdr hdr;
	u16 fc, ethertype = 0;
	enum {
		WDS_NO = 0, WDS_OWN_FRAME, WDS_COMPLIANT_FRAME
	} use_wds = WDS_NO;
	u8 *encaps_data;
	int hdr_len, encaps_len, skip_header_bytes;
	int to_assoc_ap = 0;
	struct hostap_skb_tx_data *meta;

	iface = netdev_priv(dev);
	local = iface->local;

	if (skb->len < ETH_HLEN) {
		printk(KERN_DEBUG "%s: hostap_data_start_xmit: short skb "
		       "(len=%d)\n", dev->name, skb->len);
		kfree_skb(skb);
		return NETDEV_TX_OK;
	}

	if (local->ddev != dev) {
		use_wds = (local->iw_mode == IW_MODE_MASTER &&
			   !(local->wds_type & HOSTAP_WDS_STANDARD_FRAME)) ?
			WDS_OWN_FRAME : WDS_COMPLIANT_FRAME;
		if (dev == local->stadev) {
			to_assoc_ap = 1;
			use_wds = WDS_NO;
		} else if (dev == local->apdev) {
			printk(KERN_DEBUG "%s: prism2_tx: trying to use "
			       "AP device with Ethernet net dev\n", dev->name);
			kfree_skb(skb);
			return NETDEV_TX_OK;
		}
	} else {
		if (local->iw_mode == IW_MODE_REPEAT) {
			printk(KERN_DEBUG "%s: prism2_tx: trying to use "
			       "non-WDS link in Repeater mode\n", dev->name);
			kfree_skb(skb);
			return NETDEV_TX_OK;
		} else if (local->iw_mode == IW_MODE_INFRA &&
			   (local->wds_type & HOSTAP_WDS_AP_CLIENT) &&
			   memcmp(skb->data + ETH_ALEN, dev->dev_addr,
				  ETH_ALEN) != 0) {
			/* AP client mode: send frames with foreign src addr
			 * using 4-addr WDS frames */
			use_wds = WDS_COMPLIANT_FRAME;
		}
	}

	/* Incoming skb->data: dst_addr[6], src_addr[6], proto[2], payload
	 * ==>
	 * Prism2 TX frame with 802.11 header:
	 * txdesc (address order depending on used mode; includes dst_addr and
	 * src_addr), possible encapsulation (RFC1042/Bridge-Tunnel;
	 * proto[2], payload {, possible addr4[6]} */

	ethertype = (skb->data[12] << 8) | skb->data[13];

	memset(&hdr, 0, sizeof(hdr));

	/* Length of data after IEEE 802.11 header */
	encaps_data = NULL;
	encaps_len = 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;
	}

	fc = IEEE80211_FTYPE_DATA | IEEE80211_STYPE_DATA;
	hdr_len = IEEE80211_DATA_HDR3_LEN;

	if (use_wds != WDS_NO) {
		/* Note! Prism2 station firmware has problems with sending real
		 * 802.11 frames with four addresses; until these problems can
		 * be fixed or worked around, 4-addr frames needed for WDS are
		 * using incompatible format: FromDS flag is not set and the
		 * fourth address is added after the frame payload; it is
		 * assumed, that the receiving station knows how to handle this
		 * frame format */

		if (use_wds == WDS_COMPLIANT_FRAME) {
			fc |= IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS;
			/* From&To DS: Addr1 = RA, Addr2 = TA, Addr3 = DA,
			 * Addr4 = SA */
			skb_copy_from_linear_data_offset(skb, ETH_ALEN,
							 &hdr.addr4, ETH_ALEN);
			hdr_len += ETH_ALEN;
		} else {
			/* bogus 4-addr format to workaround Prism2 station
			 * f/w bug */
			fc |= IEEE80211_FCTL_TODS;
			/* From DS: Addr1 = DA (used as RA),
			 * Addr2 = BSSID (used as TA), Addr3 = SA (used as DA),
			 */

			/* SA from skb->data + ETH_ALEN will be added after
			 * frame payload; use hdr.addr4 as a temporary buffer
			 */
			skb_copy_from_linear_data_offset(skb, ETH_ALEN,
							 &hdr.addr4, ETH_ALEN);
			need_tailroom += ETH_ALEN;
		}

		/* send broadcast and multicast frames to broadcast RA, if
		 * configured; otherwise, use unicast RA of the WDS link */
		if ((local->wds_type & HOSTAP_WDS_BROADCAST_RA) &&
		    skb->data[0] & 0x01)
			memset(&hdr.addr1, 0xff, ETH_ALEN);
		else if (iface->type == HOSTAP_INTERFACE_WDS)
			memcpy(&hdr.addr1, iface->u.wds.remote_addr,
			       ETH_ALEN);
		else
			memcpy(&hdr.addr1, local->bssid, ETH_ALEN);
		memcpy(&hdr.addr2, dev->dev_addr, ETH_ALEN);
		skb_copy_from_linear_data(skb, &hdr.addr3, ETH_ALEN);
	} else if (local->iw_mode == IW_MODE_MASTER && !to_assoc_ap) {
		fc |= IEEE80211_FCTL_FROMDS;
		/* From DS: Addr1 = DA, Addr2 = BSSID, Addr3 = SA */
		skb_copy_from_linear_data(skb, &hdr.addr1, ETH_ALEN);
		memcpy(&hdr.addr2, dev->dev_addr, ETH_ALEN);
		skb_copy_from_linear_data_offset(skb, ETH_ALEN, &hdr.addr3,
						 ETH_ALEN);
	} else if (local->iw_mode == IW_MODE_INFRA || to_assoc_ap) {
		fc |= IEEE80211_FCTL_TODS;
		/* To DS: Addr1 = BSSID, Addr2 = SA, Addr3 = DA */
		memcpy(&hdr.addr1, to_assoc_ap ?
		       local->assoc_ap_addr : local->bssid, ETH_ALEN);
		skb_copy_from_linear_data_offset(skb, ETH_ALEN, &hdr.addr2,
						 ETH_ALEN);
		skb_copy_from_linear_data(skb, &hdr.addr3, ETH_ALEN);
	} else if (local->iw_mode == IW_MODE_ADHOC) {
		/* not From/To DS: Addr1 = DA, Addr2 = SA, Addr3 = BSSID */
		skb_copy_from_linear_data(skb, &hdr.addr1, ETH_ALEN);
		skb_copy_from_linear_data_offset(skb, ETH_ALEN, &hdr.addr2,
						 ETH_ALEN);
		memcpy(&hdr.addr3, local->bssid, ETH_ALEN);
	}

	hdr.frame_control = cpu_to_le16(fc);

	skb_pull(skb, skip_header_bytes);
	need_headroom = local->func->need_tx_headroom + hdr_len + encaps_len;
	if (skb_tailroom(skb) < need_tailroom) {
		skb = skb_unshare(skb, GFP_ATOMIC);
		if (skb == NULL) {
			iface->stats.tx_dropped++;
			return NETDEV_TX_OK;
		}
		if (pskb_expand_head(skb, need_headroom, need_tailroom,
				     GFP_ATOMIC)) {
			kfree_skb(skb);
			iface->stats.tx_dropped++;
			return NETDEV_TX_OK;
		}
	} else if (skb_headroom(skb) < need_headroom) {
		struct sk_buff *tmp = skb;
		skb = skb_realloc_headroom(skb, need_headroom);
		kfree_skb(tmp);
		if (skb == NULL) {
			iface->stats.tx_dropped++;
			return NETDEV_TX_OK;
		}
	} else {
		skb = skb_unshare(skb, GFP_ATOMIC);
		if (skb == NULL) {
			iface->stats.tx_dropped++;
			return NETDEV_TX_OK;
		}
	}

	if (encaps_data)
		memcpy(skb_push(skb, encaps_len), encaps_data, encaps_len);
	memcpy(skb_push(skb, hdr_len), &hdr, hdr_len);
	if (use_wds == WDS_OWN_FRAME) {
		memcpy(skb_put(skb, ETH_ALEN), &hdr.addr4, ETH_ALEN);
	}

	iface->stats.tx_packets++;
	iface->stats.tx_bytes += skb->len;

	skb_reset_mac_header(skb);
	meta = (struct hostap_skb_tx_data *) skb->cb;
	memset(meta, 0, sizeof(*meta));
	meta->magic = HOSTAP_SKB_TX_DATA_MAGIC;
	if (use_wds)
		meta->flags |= HOSTAP_TX_FLAGS_WDS;
	meta->ethertype = ethertype;
	meta->iface = iface;

	/* Send IEEE 802.11 encapsulated frame using the master radio device */
	skb->dev = local->dev;
	dev_queue_xmit(skb);
	return NETDEV_TX_OK;
}


/* hard_start_xmit function for hostapd wlan#ap interfaces */
netdev_tx_t hostap_mgmt_start_xmit(struct sk_buff *skb,
				   struct net_device *dev)
{
	struct hostap_interface *iface;
	local_info_t *local;
	struct hostap_skb_tx_data *meta;
	struct ieee80211_hdr *hdr;
	u16 fc;

	iface = netdev_priv(dev);
	local = iface->local;

	if (skb->len < 10) {
		printk(KERN_DEBUG "%s: hostap_mgmt_start_xmit: short skb "
		       "(len=%d)\n", dev->name, skb->len);
		kfree_skb(skb);
		return NETDEV_TX_OK;
	}

	iface->stats.tx_packets++;
	iface->stats.tx_bytes += skb->len;

	meta = (struct hostap_skb_tx_data *) skb->cb;
	memset(meta, 0, sizeof(*meta));
	meta->magic = HOSTAP_SKB_TX_DATA_MAGIC;
	meta->iface = iface;

	if (skb->len >= IEEE80211_DATA_HDR3_LEN + sizeof(rfc1042_header) + 2) {
		hdr = (struct ieee80211_hdr *) skb->data;
		fc = le16_to_cpu(hdr->frame_control);
		if (ieee80211_is_data(hdr->frame_control) &&
		    (fc & IEEE80211_FCTL_STYPE) == IEEE80211_STYPE_DATA) {
			u8 *pos = &skb->data[IEEE80211_DATA_HDR3_LEN +
					     sizeof(rfc1042_header)];
			meta->ethertype = (pos[0] << 8) | pos[1];
		}
	}

	/* Send IEEE 802.11 encapsulated frame using the master radio device */
	skb->dev = local->dev;
	dev_queue_xmit(skb);
	return NETDEV_TX_OK;
}


/* Called only from software IRQ */
static struct sk_buff * hostap_tx_encrypt(struct sk_buff *skb,
					  struct lib80211_crypt_data *crypt)
{
	struct hostap_interface *iface;
	local_info_t *local;
	struct ieee80211_hdr *hdr;
	int prefix_len, postfix_len, hdr_len, res;

	iface = netdev_priv(skb->dev);
	local = iface->local;

	if (skb->len < IEEE80211_DATA_HDR3_LEN) {
		kfree_skb(skb);
		return NULL;
	}

	if (local->tkip_countermeasures &&
	    strcmp(crypt->ops->name, "TKIP") == 0) {
		hdr = (struct ieee80211_hdr *) skb->data;
		if (net_ratelimit()) {
			printk(KERN_DEBUG "%s: TKIP countermeasures: dropped "
			       "TX packet to %pM\n",
			       local->dev->name, hdr->addr1);
		}
		kfree_skb(skb);
		return NULL;
	}

	skb = skb_unshare(skb, GFP_ATOMIC);
	if (skb == NULL)
		return NULL;

	prefix_len = crypt->ops->extra_mpdu_prefix_len +
		crypt->ops->extra_msdu_prefix_len;
	postfix_len = crypt->ops->extra_mpdu_postfix_len +
		crypt->ops->extra_msdu_postfix_len;
	if ((skb_headroom(skb) < prefix_len ||
	     skb_tailroom(skb) < postfix_len) &&
	    pskb_expand_head(skb, prefix_len, postfix_len, GFP_ATOMIC)) {
		kfree_skb(skb);
		return NULL;
	}

	hdr = (struct ieee80211_hdr *) skb->data;
	hdr_len = hostap_80211_get_hdrlen(hdr->frame_control);

	/* 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(skb, hdr_len, crypt->priv);
	if (res == 0 && crypt->ops->encrypt_mpdu)
		res = crypt->ops->encrypt_mpdu(skb, hdr_len, crypt->priv);
	atomic_dec(&crypt->refcnt);
	if (res < 0) {
		kfree_skb(skb);
		return NULL;
	}

	return skb;
}


/* hard_start_xmit function for master radio interface wifi#.
 * AP processing (TX rate control, power save buffering, etc.).
 * Use hardware TX function to send the frame. */
netdev_tx_t hostap_master_start_xmit(struct sk_buff *skb,
				     struct net_device *dev)
{
	struct hostap_interface *iface;
	local_info_t *local;
	netdev_tx_t ret = NETDEV_TX_BUSY;
	u16 fc;
	struct hostap_tx_data tx;
	ap_tx_ret tx_ret;
	struct hostap_skb_tx_data *meta;
	int no_encrypt = 0;
	struct ieee80211_hdr *hdr;

	iface = netdev_priv(dev);
	local = iface->local;

	tx.skb = skb;
	tx.sta_ptr = NULL;

	meta = (struct hostap_skb_tx_data *) skb->cb;
	if (meta->magic != HOSTAP_SKB_TX_DATA_MAGIC) {
		printk(KERN_DEBUG "%s: invalid skb->cb magic (0x%08x, "
		       "expected 0x%08x)\n",
		       dev->name, meta->magic, HOSTAP_SKB_TX_DATA_MAGIC);
		ret = NETDEV_TX_OK;
		iface->stats.tx_dropped++;
		goto fail;
	}

	if (local->host_encrypt) {
		/* Set crypt to default algorithm and key; will be replaced in
		 * AP code if STA has own alg/key */
		tx.crypt = local->crypt_info.crypt[local->crypt_info.tx_keyidx];
		tx.host_encrypt = 1;
	} else {
		tx.crypt = NULL;
		tx.host_encrypt = 0;
	}

	if (skb->len < 24) {
		printk(KERN_DEBUG "%s: hostap_master_start_xmit: short skb "
		       "(len=%d)\n", dev->name, skb->len);
		ret = NETDEV_TX_OK;
		iface->stats.tx_dropped++;
		goto fail;
	}

	/* FIX (?):
	 * Wi-Fi 802.11b test plan suggests that AP should ignore power save
	 * bit in authentication and (re)association frames and assume tha
	 * STA remains awake for the response. */
	tx_ret = hostap_handle_sta_tx(local, &tx);
	skb = tx.skb;
	meta = (struct hostap_skb_tx_data *) skb->cb;
	hdr = (struct ieee80211_hdr *) skb->data;
	fc = le16_to_cpu(hdr->frame_control);
	switch (tx_ret) {
	case AP_TX_CONTINUE:
		break;
	case AP_TX_CONTINUE_NOT_AUTHORIZED:
		if (local->ieee_802_1x &&
		    ieee80211_is_data(hdr->frame_control) &&
		    meta->ethertype != ETH_P_PAE &&
		    !(meta->flags & HOSTAP_TX_FLAGS_WDS)) {
			printk(KERN_DEBUG "%s: dropped frame to unauthorized "
			       "port (IEEE 802.1X): ethertype=0x%04x\n",
			       dev->name, meta->ethertype);
			hostap_dump_tx_80211(dev->name, skb);

			ret = NETDEV_TX_OK; /* drop packet */
			iface->stats.tx_dropped++;
			goto fail;
		}
		break;
	case AP_TX_DROP:
		ret = NETDEV_TX_OK; /* drop packet */
		iface->stats.tx_dropped++;
		goto fail;
	case AP_TX_RETRY:
		goto fail;
	case AP_TX_BUFFERED:
		/* do not free skb here, it will be freed when the
		 * buffered frame is sent/timed out */
		ret = NETDEV_TX_OK;
		goto tx_exit;
	}

	/* Request TX callback if protocol version is 2 in 802.11 header;
	 * this version 2 is a special case used between hostapd and kernel
	 * driver */
	if (((fc & IEEE80211_FCTL_VERS) == BIT(1)) &&
	    local->ap && local->ap->tx_callback_idx && meta->tx_cb_idx == 0) {
		meta->tx_cb_idx = local->ap->tx_callback_idx;

		/* remove special version from the frame header */
		fc &= ~IEEE80211_FCTL_VERS;
		hdr->frame_control = cpu_to_le16(fc);
	}

	if (!ieee80211_is_data(hdr->frame_control)) {
		no_encrypt = 1;
		tx.crypt = NULL;
	}

	if (local->ieee_802_1x && meta->ethertype == ETH_P_PAE && tx.crypt &&
	    !(fc & IEEE80211_FCTL_PROTECTED)) {
		no_encrypt = 1;
		PDEBUG(DEBUG_EXTRA2, "%s: TX: IEEE 802.1X - passing "
		       "unencrypted EAPOL frame\n", dev->name);
		tx.crypt = NULL; /* no encryption for IEEE 802.1X frames */
	}

	if (tx.crypt && (!tx.crypt->ops || !tx.crypt->ops->encrypt_mpdu))
		tx.crypt = NULL;
	else if ((tx.crypt ||
		 local->crypt_info.crypt[local->crypt_info.tx_keyidx]) &&
		 !no_encrypt) {
		/* Add ISWEP flag both for firmware and host based encryption
		 */
		fc |= IEEE80211_FCTL_PROTECTED;
		hdr->frame_control = cpu_to_le16(fc);
	} else if (local->drop_unencrypted &&
		   ieee80211_is_data(hdr->frame_control) &&
		   meta->ethertype != ETH_P_PAE) {
		if (net_ratelimit()) {
			printk(KERN_DEBUG "%s: dropped unencrypted TX data "
			       "frame (drop_unencrypted=1)\n", dev->name);
		}
		iface->stats.tx_dropped++;
		ret = NETDEV_TX_OK;
		goto fail;
	}

	if (tx.crypt) {
		skb = hostap_tx_encrypt(skb, tx.crypt);
		if (skb == NULL) {
			printk(KERN_DEBUG "%s: TX - encryption failed\n",
			       dev->name);
			ret = NETDEV_TX_OK;
			goto fail;
		}
		meta = (struct hostap_skb_tx_data *) skb->cb;
		if (meta->magic != HOSTAP_SKB_TX_DATA_MAGIC) {
			printk(KERN_DEBUG "%s: invalid skb->cb magic (0x%08x, "
			       "expected 0x%08x) after hostap_tx_encrypt\n",
			       dev->name, meta->magic,
			       HOSTAP_SKB_TX_DATA_MAGIC);
			ret = NETDEV_TX_OK;
			iface->stats.tx_dropped++;
			goto fail;
		}
	}

	if (local->func->tx == NULL || local->func->tx(skb, dev)) {
		ret = NETDEV_TX_OK;
		iface->stats.tx_dropped++;
	} else {
		ret = NETDEV_TX_OK;
		iface->stats.tx_packets++;
		iface->stats.tx_bytes += skb->len;
	}

 fail:
	if (ret == NETDEV_TX_OK && skb)
		dev_kfree_skb(skb);
 tx_exit:
	if (tx.sta_ptr)
		hostap_handle_sta_release(tx.sta_ptr);
	return ret;
}


EXPORT_SYMBOL(hostap_master_start_xmit);
Commit	Line	Data
5a0e3ad6 TH	1	#include <linux/slab.h>
5a0e3ad6 TH	2
5fad5a2e AB	3	#include "hostap_80211.h"
	4	#include "hostap_common.h"
	5	#include "hostap_wlan.h"
	6	#include "hostap.h"
	7	#include "hostap_ap.h"
	8
	9	/* See IEEE 802.1H for LLC/SNAP encapsulation/decapsulation */
	10	/* Ethernet-II snap header (RFC1042 for most EtherTypes) */
	11	static unsigned char rfc1042_header[] =
	12	{ 0xaa, 0xaa, 0x03, 0x00, 0x00, 0x00 };
	13	/* Bridge-Tunnel header (for EtherTypes ETH_P_AARP and ETH_P_IPX) */
	14	static unsigned char bridge_tunnel_header[] =
	15	{ 0xaa, 0xaa, 0x03, 0x00, 0x00, 0xf8 };
	16	/* No encapsulation header if EtherType < 0x600 (=length) */
	17
ff1d2767 JM	18	void hostap_dump_tx_80211(const char name, struct sk_buff skb)
ff1d2767 JM	19	{
1ea893fd	20	struct ieee80211_hdr *hdr;
ff1d2767 JM	21	u16 fc;
ff1d2767 JM	22
1ea893fd	23	hdr = (struct ieee80211_hdr *) skb->data;
ff1d2767 JM	24
	25	printk(KERN_DEBUG "%s: TX len=%d jiffies=%ld\n",
	26	name, skb->len, jiffies);
	27
	28	if (skb->len < 2)
	29	return;
	30
1ea893fd	31	fc = le16_to_cpu(hdr->frame_control);
ff1d2767	32	printk(KERN_DEBUG " FC=0x%04x (type=%d:%d)%s%s",
1ea893fd DW	33	fc, (fc & IEEE80211_FCTL_FTYPE) >> 2,
1ea893fd DW	34	(fc & IEEE80211_FCTL_STYPE) >> 4,
b2f4a2e3 JM	35	fc & IEEE80211_FCTL_TODS ? " [ToDS]" : "",
b2f4a2e3 JM	36	fc & IEEE80211_FCTL_FROMDS ? " [FromDS]" : "");
ff1d2767 JM	37
	38	if (skb->len < IEEE80211_DATA_HDR3_LEN) {
	39	printk("\n");
	40	return;
	41	}
	42
	43	printk(" dur=0x%04x seq=0x%04x\n", le16_to_cpu(hdr->duration_id),
1ea893fd	44	le16_to_cpu(hdr->seq_ctrl));
ff1d2767	45
e174961c JB	46	printk(KERN_DEBUG " A1=%pM", hdr->addr1);
	47	printk(" A2=%pM", hdr->addr2);
	48	printk(" A3=%pM", hdr->addr3);
ff1d2767	49	if (skb->len >= 30)
e174961c	50	printk(" A4=%pM", hdr->addr4);
ff1d2767 JM	51	printk("\n");
	52	}
	53
	54
	55	/* hard_start_xmit function for data interfaces (wlan#, wlan#wds#, wlan#sta)
	56	* Convert Ethernet header into a suitable IEEE 802.11 header depending on
	57	* device configuration. */
d0cf9c0d SH	58	netdev_tx_t hostap_data_start_xmit(struct sk_buff *skb,
d0cf9c0d SH	59	struct net_device *dev)
ff1d2767 JM	60	{
	61	struct hostap_interface *iface;
	62	local_info_t *local;
	63	int need_headroom, need_tailroom = 0;
1ea893fd	64	struct ieee80211_hdr hdr;
ff1d2767 JM	65	u16 fc, ethertype = 0;
	66	enum {
	67	WDS_NO = 0, WDS_OWN_FRAME, WDS_COMPLIANT_FRAME
	68	} use_wds = WDS_NO;
	69	u8 *encaps_data;
	70	int hdr_len, encaps_len, skip_header_bytes;
	71	int to_assoc_ap = 0;
	72	struct hostap_skb_tx_data *meta;
	73
	74	iface = netdev_priv(dev);
	75	local = iface->local;
	76
	77	if (skb->len < ETH_HLEN) {
	78	printk(KERN_DEBUG "%s: hostap_data_start_xmit: short skb "
	79	"(len=%d)\n", dev->name, skb->len);
	80	kfree_skb(skb);
ec634fe3	81	return NETDEV_TX_OK;
ff1d2767 JM	82	}
	83
	84	if (local->ddev != dev) {
	85	use_wds = (local->iw_mode == IW_MODE_MASTER &&
	86	!(local->wds_type & HOSTAP_WDS_STANDARD_FRAME)) ?
	87	WDS_OWN_FRAME : WDS_COMPLIANT_FRAME;
	88	if (dev == local->stadev) {
	89	to_assoc_ap = 1;
	90	use_wds = WDS_NO;
	91	} else if (dev == local->apdev) {
	92	printk(KERN_DEBUG "%s: prism2_tx: trying to use "
	93	"AP device with Ethernet net dev\n", dev->name);
	94	kfree_skb(skb);
ec634fe3	95	return NETDEV_TX_OK;
ff1d2767 JM	96	}
	97	} else {
	98	if (local->iw_mode == IW_MODE_REPEAT) {
	99	printk(KERN_DEBUG "%s: prism2_tx: trying to use "
	100	"non-WDS link in Repeater mode\n", dev->name);
	101	kfree_skb(skb);
ec634fe3	102	return NETDEV_TX_OK;
ff1d2767 JM	103	} else if (local->iw_mode == IW_MODE_INFRA &&
	104	(local->wds_type & HOSTAP_WDS_AP_CLIENT) &&
	105	memcmp(skb->data + ETH_ALEN, dev->dev_addr,
	106	ETH_ALEN) != 0) {
	107	/* AP client mode: send frames with foreign src addr
	108	* using 4-addr WDS frames */
	109	use_wds = WDS_COMPLIANT_FRAME;
	110	}
	111	}
	112
	113	/* Incoming skb->data: dst_addr[6], src_addr[6], proto[2], payload
	114	* ==>
	115	* Prism2 TX frame with 802.11 header:
	116	* txdesc (address order depending on used mode; includes dst_addr and
	117	* src_addr), possible encapsulation (RFC1042/Bridge-Tunnel;
	118	* proto[2], payload {, possible addr4[6]} */
	119
	120	ethertype = (skb->data[12] << 8) \| skb->data[13];
	121
	122	memset(&hdr, 0, sizeof(hdr));
	123
	124	/* Length of data after IEEE 802.11 header */
	125	encaps_data = NULL;
	126	encaps_len = 0;
	127	skip_header_bytes = ETH_HLEN;
	128	if (ethertype == ETH_P_AARP \|\| ethertype == ETH_P_IPX) {
	129	encaps_data = bridge_tunnel_header;
	130	encaps_len = sizeof(bridge_tunnel_header);
	131	skip_header_bytes -= 2;
	132	} else if (ethertype >= 0x600) {
	133	encaps_data = rfc1042_header;
	134	encaps_len = sizeof(rfc1042_header);
	135	skip_header_bytes -= 2;
	136	}
	137
4339d328	138	fc = IEEE80211_FTYPE_DATA \| IEEE80211_STYPE_DATA;
ff1d2767 JM	139	hdr_len = IEEE80211_DATA_HDR3_LEN;
	140
	141	if (use_wds != WDS_NO) {
	142	/* Note! Prism2 station firmware has problems with sending real
	143	* 802.11 frames with four addresses; until these problems can
	144	* be fixed or worked around, 4-addr frames needed for WDS are
	145	* using incompatible format: FromDS flag is not set and the
	146	* fourth address is added after the frame payload; it is
	147	* assumed, that the receiving station knows how to handle this
	148	* frame format */
	149
	150	if (use_wds == WDS_COMPLIANT_FRAME) {
b2f4a2e3	151	fc \|= IEEE80211_FCTL_FROMDS \| IEEE80211_FCTL_TODS;
ff1d2767 JM	152	/* From&To DS: Addr1 = RA, Addr2 = TA, Addr3 = DA,
ff1d2767 JM	153	* Addr4 = SA */
d626f62b ACM	154	skb_copy_from_linear_data_offset(skb, ETH_ALEN,
d626f62b ACM	155	&hdr.addr4, ETH_ALEN);
ff1d2767 JM	156	hdr_len += ETH_ALEN;
	157	} else {
	158	/* bogus 4-addr format to workaround Prism2 station
	159	* f/w bug */
b2f4a2e3	160	fc \|= IEEE80211_FCTL_TODS;
ff1d2767 JM	161	/* From DS: Addr1 = DA (used as RA),
	162	* Addr2 = BSSID (used as TA), Addr3 = SA (used as DA),
	163	*/
	164
	165	/* SA from skb->data + ETH_ALEN will be added after
	166	* frame payload; use hdr.addr4 as a temporary buffer
	167	*/
d626f62b ACM	168	skb_copy_from_linear_data_offset(skb, ETH_ALEN,
d626f62b ACM	169	&hdr.addr4, ETH_ALEN);
ff1d2767 JM	170	need_tailroom += ETH_ALEN;
	171	}
	172
	173	/* send broadcast and multicast frames to broadcast RA, if
	174	* configured; otherwise, use unicast RA of the WDS link */
	175	if ((local->wds_type & HOSTAP_WDS_BROADCAST_RA) &&
	176	skb->data[0] & 0x01)
	177	memset(&hdr.addr1, 0xff, ETH_ALEN);
	178	else if (iface->type == HOSTAP_INTERFACE_WDS)
	179	memcpy(&hdr.addr1, iface->u.wds.remote_addr,
	180	ETH_ALEN);
	181	else
	182	memcpy(&hdr.addr1, local->bssid, ETH_ALEN);
	183	memcpy(&hdr.addr2, dev->dev_addr, ETH_ALEN);
d626f62b	184	skb_copy_from_linear_data(skb, &hdr.addr3, ETH_ALEN);
ff1d2767	185	} else if (local->iw_mode == IW_MODE_MASTER && !to_assoc_ap) {
b2f4a2e3	186	fc \|= IEEE80211_FCTL_FROMDS;
ff1d2767	187	/* From DS: Addr1 = DA, Addr2 = BSSID, Addr3 = SA */
d626f62b	188	skb_copy_from_linear_data(skb, &hdr.addr1, ETH_ALEN);
ff1d2767	189	memcpy(&hdr.addr2, dev->dev_addr, ETH_ALEN);
d626f62b ACM	190	skb_copy_from_linear_data_offset(skb, ETH_ALEN, &hdr.addr3,
d626f62b ACM	191	ETH_ALEN);
ff1d2767	192	} else if (local->iw_mode == IW_MODE_INFRA \|\| to_assoc_ap) {
b2f4a2e3	193	fc \|= IEEE80211_FCTL_TODS;
ff1d2767 JM	194	/* To DS: Addr1 = BSSID, Addr2 = SA, Addr3 = DA */
	195	memcpy(&hdr.addr1, to_assoc_ap ?
	196	local->assoc_ap_addr : local->bssid, ETH_ALEN);
d626f62b ACM	197	skb_copy_from_linear_data_offset(skb, ETH_ALEN, &hdr.addr2,
	198	ETH_ALEN);
	199	skb_copy_from_linear_data(skb, &hdr.addr3, ETH_ALEN);
ff1d2767 JM	200	} else if (local->iw_mode == IW_MODE_ADHOC) {
ff1d2767 JM	201	/* not From/To DS: Addr1 = DA, Addr2 = SA, Addr3 = BSSID */
d626f62b ACM	202	skb_copy_from_linear_data(skb, &hdr.addr1, ETH_ALEN);
	203	skb_copy_from_linear_data_offset(skb, ETH_ALEN, &hdr.addr2,
	204	ETH_ALEN);
ff1d2767 JM	205	memcpy(&hdr.addr3, local->bssid, ETH_ALEN);
	206	}
	207
1ea893fd	208	hdr.frame_control = cpu_to_le16(fc);
ff1d2767 JM	209
	210	skb_pull(skb, skip_header_bytes);
	211	need_headroom = local->func->need_tx_headroom + hdr_len + encaps_len;
	212	if (skb_tailroom(skb) < need_tailroom) {
	213	skb = skb_unshare(skb, GFP_ATOMIC);
	214	if (skb == NULL) {
	215	iface->stats.tx_dropped++;
ec634fe3	216	return NETDEV_TX_OK;
ff1d2767 JM	217	}
	218	if (pskb_expand_head(skb, need_headroom, need_tailroom,
	219	GFP_ATOMIC)) {
	220	kfree_skb(skb);
	221	iface->stats.tx_dropped++;
ec634fe3	222	return NETDEV_TX_OK;
ff1d2767 JM	223	}
	224	} else if (skb_headroom(skb) < need_headroom) {
	225	struct sk_buff *tmp = skb;
	226	skb = skb_realloc_headroom(skb, need_headroom);
	227	kfree_skb(tmp);
	228	if (skb == NULL) {
	229	iface->stats.tx_dropped++;
ec634fe3	230	return NETDEV_TX_OK;
ff1d2767 JM	231	}
	232	} else {
	233	skb = skb_unshare(skb, GFP_ATOMIC);
	234	if (skb == NULL) {
	235	iface->stats.tx_dropped++;
ec634fe3	236	return NETDEV_TX_OK;
ff1d2767 JM	237	}
	238	}
	239
	240	if (encaps_data)
	241	memcpy(skb_push(skb, encaps_len), encaps_data, encaps_len);
	242	memcpy(skb_push(skb, hdr_len), &hdr, hdr_len);
	243	if (use_wds == WDS_OWN_FRAME) {
	244	memcpy(skb_put(skb, ETH_ALEN), &hdr.addr4, ETH_ALEN);
	245	}
	246
	247	iface->stats.tx_packets++;
	248	iface->stats.tx_bytes += skb->len;
	249
459a98ed	250	skb_reset_mac_header(skb);
ff1d2767 JM	251	meta = (struct hostap_skb_tx_data *) skb->cb;
	252	memset(meta, 0, sizeof(*meta));
	253	meta->magic = HOSTAP_SKB_TX_DATA_MAGIC;
5bee720f JM	254	if (use_wds)
5bee720f JM	255	meta->flags \|= HOSTAP_TX_FLAGS_WDS;
ff1d2767 JM	256	meta->ethertype = ethertype;
	257	meta->iface = iface;
	258
	259	/* Send IEEE 802.11 encapsulated frame using the master radio device */
	260	skb->dev = local->dev;
	261	dev_queue_xmit(skb);
ec634fe3	262	return NETDEV_TX_OK;
ff1d2767 JM	263	}
	264
	265
	266	/* hard_start_xmit function for hostapd wlan#ap interfaces */
d0cf9c0d SH	267	netdev_tx_t hostap_mgmt_start_xmit(struct sk_buff *skb,
d0cf9c0d SH	268	struct net_device *dev)
ff1d2767 JM	269	{
	270	struct hostap_interface *iface;
	271	local_info_t *local;
	272	struct hostap_skb_tx_data *meta;
1ea893fd	273	struct ieee80211_hdr *hdr;
ff1d2767 JM	274	u16 fc;
	275
	276	iface = netdev_priv(dev);
	277	local = iface->local;
	278
	279	if (skb->len < 10) {
	280	printk(KERN_DEBUG "%s: hostap_mgmt_start_xmit: short skb "
	281	"(len=%d)\n", dev->name, skb->len);
	282	kfree_skb(skb);
ec634fe3	283	return NETDEV_TX_OK;
ff1d2767 JM	284	}
	285
	286	iface->stats.tx_packets++;
	287	iface->stats.tx_bytes += skb->len;
	288
	289	meta = (struct hostap_skb_tx_data *) skb->cb;
	290	memset(meta, 0, sizeof(*meta));
	291	meta->magic = HOSTAP_SKB_TX_DATA_MAGIC;
	292	meta->iface = iface;
	293
	294	if (skb->len >= IEEE80211_DATA_HDR3_LEN + sizeof(rfc1042_header) + 2) {
1ea893fd DW	295	hdr = (struct ieee80211_hdr *) skb->data;
	296	fc = le16_to_cpu(hdr->frame_control);
	297	if (ieee80211_is_data(hdr->frame_control) &&
	298	(fc & IEEE80211_FCTL_STYPE) == IEEE80211_STYPE_DATA) {
ff1d2767 JM	299	u8 *pos = &skb->data[IEEE80211_DATA_HDR3_LEN +
	300	sizeof(rfc1042_header)];
	301	meta->ethertype = (pos[0] << 8) \| pos[1];
	302	}
	303	}
	304
	305	/* Send IEEE 802.11 encapsulated frame using the master radio device */
	306	skb->dev = local->dev;
	307	dev_queue_xmit(skb);
ec634fe3	308	return NETDEV_TX_OK;
ff1d2767 JM	309	}
	310
	311
	312	/* Called only from software IRQ */
79058aca	313	static struct sk_buff * hostap_tx_encrypt(struct sk_buff *skb,
274bfb8d	314	struct lib80211_crypt_data *crypt)
ff1d2767 JM	315	{
	316	struct hostap_interface *iface;
	317	local_info_t *local;
1ea893fd	318	struct ieee80211_hdr *hdr;
d7ea3be5	319	int prefix_len, postfix_len, hdr_len, res;
ff1d2767 JM	320
	321	iface = netdev_priv(skb->dev);
	322	local = iface->local;
	323
	324	if (skb->len < IEEE80211_DATA_HDR3_LEN) {
	325	kfree_skb(skb);
	326	return NULL;
	327	}
	328
	329	if (local->tkip_countermeasures &&
79058aca	330	strcmp(crypt->ops->name, "TKIP") == 0) {
1ea893fd	331	hdr = (struct ieee80211_hdr *) skb->data;
ff1d2767 JM	332	if (net_ratelimit()) {
ff1d2767 JM	333	printk(KERN_DEBUG "%s: TKIP countermeasures: dropped "
e174961c JB	334	"TX packet to %pM\n",
e174961c JB	335	local->dev->name, hdr->addr1);
ff1d2767 JM	336	}
	337	kfree_skb(skb);
	338	return NULL;
	339	}
	340
	341	skb = skb_unshare(skb, GFP_ATOMIC);
	342	if (skb == NULL)
	343	return NULL;
	344
d7ea3be5 BCR	345	prefix_len = crypt->ops->extra_mpdu_prefix_len +
	346	crypt->ops->extra_msdu_prefix_len;
	347	postfix_len = crypt->ops->extra_mpdu_postfix_len +
	348	crypt->ops->extra_msdu_postfix_len;
	349	if ((skb_headroom(skb) < prefix_len \|\|
	350	skb_tailroom(skb) < postfix_len) &&
	351	pskb_expand_head(skb, prefix_len, postfix_len, GFP_ATOMIC)) {
ff1d2767 JM	352	kfree_skb(skb);
	353	return NULL;
	354	}
	355
1ea893fd DW	356	hdr = (struct ieee80211_hdr *) skb->data;
1ea893fd DW	357	hdr_len = hostap_80211_get_hdrlen(hdr->frame_control);
ff1d2767 JM	358
	359	/* Host-based IEEE 802.11 fragmentation for TX is not yet supported, so
	360	* call both MSDU and MPDU encryption functions from here. */
	361	atomic_inc(&crypt->refcnt);
	362	res = 0;
	363	if (crypt->ops->encrypt_msdu)
	364	res = crypt->ops->encrypt_msdu(skb, hdr_len, crypt->priv);
	365	if (res == 0 && crypt->ops->encrypt_mpdu)
	366	res = crypt->ops->encrypt_mpdu(skb, hdr_len, crypt->priv);
	367	atomic_dec(&crypt->refcnt);
	368	if (res < 0) {
	369	kfree_skb(skb);
	370	return NULL;
	371	}
	372
	373	return skb;
	374	}
	375
	376
	377	/* hard_start_xmit function for master radio interface wifi#.
	378	* AP processing (TX rate control, power save buffering, etc.).
	379	* Use hardware TX function to send the frame. */
d0cf9c0d SH	380	netdev_tx_t hostap_master_start_xmit(struct sk_buff *skb,
d0cf9c0d SH	381	struct net_device *dev)
ff1d2767 JM	382	{
	383	struct hostap_interface *iface;
	384	local_info_t *local;
d0cf9c0d	385	netdev_tx_t ret = NETDEV_TX_BUSY;
ff1d2767 JM	386	u16 fc;
	387	struct hostap_tx_data tx;
	388	ap_tx_ret tx_ret;
	389	struct hostap_skb_tx_data *meta;
	390	int no_encrypt = 0;
1ea893fd	391	struct ieee80211_hdr *hdr;
ff1d2767 JM	392
	393	iface = netdev_priv(dev);
	394	local = iface->local;
	395
	396	tx.skb = skb;
	397	tx.sta_ptr = NULL;
	398
	399	meta = (struct hostap_skb_tx_data *) skb->cb;
	400	if (meta->magic != HOSTAP_SKB_TX_DATA_MAGIC) {
	401	printk(KERN_DEBUG "%s: invalid skb->cb magic (0x%08x, "
	402	"expected 0x%08x)\n",
	403	dev->name, meta->magic, HOSTAP_SKB_TX_DATA_MAGIC);
ec634fe3	404	ret = NETDEV_TX_OK;
ff1d2767 JM	405	iface->stats.tx_dropped++;
	406	goto fail;
	407	}
	408
	409	if (local->host_encrypt) {
	410	/* Set crypt to default algorithm and key; will be replaced in
	411	* AP code if STA has own alg/key */
274bfb8d	412	tx.crypt = local->crypt_info.crypt[local->crypt_info.tx_keyidx];
ff1d2767 JM	413	tx.host_encrypt = 1;
	414	} else {
	415	tx.crypt = NULL;
	416	tx.host_encrypt = 0;
	417	}
	418
	419	if (skb->len < 24) {
	420	printk(KERN_DEBUG "%s: hostap_master_start_xmit: short skb "
	421	"(len=%d)\n", dev->name, skb->len);
ec634fe3	422	ret = NETDEV_TX_OK;
ff1d2767 JM	423	iface->stats.tx_dropped++;
	424	goto fail;
	425	}
	426
	427	/* FIX (?):
	428	* Wi-Fi 802.11b test plan suggests that AP should ignore power save
	429	* bit in authentication and (re)association frames and assume tha
	430	* STA remains awake for the response. */
	431	tx_ret = hostap_handle_sta_tx(local, &tx);
	432	skb = tx.skb;
	433	meta = (struct hostap_skb_tx_data *) skb->cb;
1ea893fd DW	434	hdr = (struct ieee80211_hdr *) skb->data;
1ea893fd DW	435	fc = le16_to_cpu(hdr->frame_control);
ff1d2767 JM	436	switch (tx_ret) {
	437	case AP_TX_CONTINUE:
	438	break;
	439	case AP_TX_CONTINUE_NOT_AUTHORIZED:
	440	if (local->ieee_802_1x &&
1ea893fd	441	ieee80211_is_data(hdr->frame_control) &&
5bee720f JM	442	meta->ethertype != ETH_P_PAE &&
5bee720f JM	443	!(meta->flags & HOSTAP_TX_FLAGS_WDS)) {
ff1d2767 JM	444	printk(KERN_DEBUG "%s: dropped frame to unauthorized "
	445	"port (IEEE 802.1X): ethertype=0x%04x\n",
	446	dev->name, meta->ethertype);
	447	hostap_dump_tx_80211(dev->name, skb);
	448
ec634fe3	449	ret = NETDEV_TX_OK; /* drop packet */
ff1d2767 JM	450	iface->stats.tx_dropped++;
	451	goto fail;
	452	}
	453	break;
	454	case AP_TX_DROP:
ec634fe3	455	ret = NETDEV_TX_OK; /* drop packet */
ff1d2767 JM	456	iface->stats.tx_dropped++;
	457	goto fail;
	458	case AP_TX_RETRY:
	459	goto fail;
	460	case AP_TX_BUFFERED:
	461	/* do not free skb here, it will be freed when the
	462	* buffered frame is sent/timed out */
ec634fe3	463	ret = NETDEV_TX_OK;
ff1d2767 JM	464	goto tx_exit;
	465	}
	466
	467	/* Request TX callback if protocol version is 2 in 802.11 header;
	468	* this version 2 is a special case used between hostapd and kernel
	469	* driver */
b2f4a2e3	470	if (((fc & IEEE80211_FCTL_VERS) == BIT(1)) &&
ff1d2767 JM	471	local->ap && local->ap->tx_callback_idx && meta->tx_cb_idx == 0) {
	472	meta->tx_cb_idx = local->ap->tx_callback_idx;
	473
	474	/* remove special version from the frame header */
b2f4a2e3	475	fc &= ~IEEE80211_FCTL_VERS;
1ea893fd	476	hdr->frame_control = cpu_to_le16(fc);
ff1d2767 JM	477	}
ff1d2767 JM	478
1ea893fd	479	if (!ieee80211_is_data(hdr->frame_control)) {
ff1d2767 JM	480	no_encrypt = 1;
	481	tx.crypt = NULL;
	482	}
	483
	484	if (local->ieee_802_1x && meta->ethertype == ETH_P_PAE && tx.crypt &&
cfa146e4	485	!(fc & IEEE80211_FCTL_PROTECTED)) {
ff1d2767 JM	486	no_encrypt = 1;
	487	PDEBUG(DEBUG_EXTRA2, "%s: TX: IEEE 802.1X - passing "
	488	"unencrypted EAPOL frame\n", dev->name);
	489	tx.crypt = NULL; /* no encryption for IEEE 802.1X frames */
	490	}
	491
	492	if (tx.crypt && (!tx.crypt->ops \|\| !tx.crypt->ops->encrypt_mpdu))
	493	tx.crypt = NULL;
274bfb8d JL	494	else if ((tx.crypt \|\|
	495	local->crypt_info.crypt[local->crypt_info.tx_keyidx]) &&
	496	!no_encrypt) {
ff1d2767 JM	497	/* Add ISWEP flag both for firmware and host based encryption
ff1d2767 JM	498	*/
831a179f	499	fc \|= IEEE80211_FCTL_PROTECTED;
1ea893fd	500	hdr->frame_control = cpu_to_le16(fc);
ff1d2767	501	} else if (local->drop_unencrypted &&
1ea893fd	502	ieee80211_is_data(hdr->frame_control) &&
ff1d2767 JM	503	meta->ethertype != ETH_P_PAE) {
	504	if (net_ratelimit()) {
	505	printk(KERN_DEBUG "%s: dropped unencrypted TX data "
	506	"frame (drop_unencrypted=1)\n", dev->name);
	507	}
	508	iface->stats.tx_dropped++;
ec634fe3	509	ret = NETDEV_TX_OK;
ff1d2767 JM	510	goto fail;
	511	}
	512
	513	if (tx.crypt) {
	514	skb = hostap_tx_encrypt(skb, tx.crypt);
	515	if (skb == NULL) {
	516	printk(KERN_DEBUG "%s: TX - encryption failed\n",
	517	dev->name);
ec634fe3	518	ret = NETDEV_TX_OK;
ff1d2767 JM	519	goto fail;
	520	}
	521	meta = (struct hostap_skb_tx_data *) skb->cb;
	522	if (meta->magic != HOSTAP_SKB_TX_DATA_MAGIC) {
	523	printk(KERN_DEBUG "%s: invalid skb->cb magic (0x%08x, "
	524	"expected 0x%08x) after hostap_tx_encrypt\n",
	525	dev->name, meta->magic,
	526	HOSTAP_SKB_TX_DATA_MAGIC);
ec634fe3	527	ret = NETDEV_TX_OK;
ff1d2767 JM	528	iface->stats.tx_dropped++;
	529	goto fail;
	530	}
	531	}
	532
	533	if (local->func->tx == NULL \|\| local->func->tx(skb, dev)) {
ec634fe3	534	ret = NETDEV_TX_OK;
ff1d2767 JM	535	iface->stats.tx_dropped++;
ff1d2767 JM	536	} else {
ec634fe3	537	ret = NETDEV_TX_OK;
ff1d2767 JM	538	iface->stats.tx_packets++;
	539	iface->stats.tx_bytes += skb->len;
	540	}
	541
	542	fail:
ec634fe3	543	if (ret == NETDEV_TX_OK && skb)
ff1d2767 JM	544	dev_kfree_skb(skb);
	545	tx_exit:
	546	if (tx.sta_ptr)
	547	hostap_handle_sta_release(tx.sta_ptr);
	548	return ret;
	549	}
	550
	551
ff1d2767	552	EXPORT_SYMBOL(hostap_master_start_xmit);