[deliverable/linux.git] / drivers / net / wireless / hostap / hostap_80211_tx.c

#include <linux/slab.h>
#include <linux/export.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	1	#include <linux/slab.h>
ee40fa06	2	#include <linux/export.h>
5a0e3ad6	3
5fad5a2e AB	4	#include "hostap_80211.h"
	5	#include "hostap_common.h"
	6	#include "hostap_wlan.h"
	7	#include "hostap.h"
	8	#include "hostap_ap.h"
	9
	10	/* See IEEE 802.1H for LLC/SNAP encapsulation/decapsulation */
	11	/* Ethernet-II snap header (RFC1042 for most EtherTypes) */
	12	static unsigned char rfc1042_header[] =
	13	{ 0xaa, 0xaa, 0x03, 0x00, 0x00, 0x00 };
	14	/* Bridge-Tunnel header (for EtherTypes ETH_P_AARP and ETH_P_IPX) */
	15	static unsigned char bridge_tunnel_header[] =
	16	{ 0xaa, 0xaa, 0x03, 0x00, 0x00, 0xf8 };
	17	/* No encapsulation header if EtherType < 0x600 (=length) */
	18
ff1d2767 JM	19	void hostap_dump_tx_80211(const char name, struct sk_buff skb)
ff1d2767 JM	20	{
1ea893fd	21	struct ieee80211_hdr *hdr;
ff1d2767 JM	22	u16 fc;
ff1d2767 JM	23
1ea893fd	24	hdr = (struct ieee80211_hdr *) skb->data;
ff1d2767 JM	25
	26	printk(KERN_DEBUG "%s: TX len=%d jiffies=%ld\n",
	27	name, skb->len, jiffies);
	28
	29	if (skb->len < 2)
	30	return;
	31
1ea893fd	32	fc = le16_to_cpu(hdr->frame_control);
ff1d2767	33	printk(KERN_DEBUG " FC=0x%04x (type=%d:%d)%s%s",
1ea893fd DW	34	fc, (fc & IEEE80211_FCTL_FTYPE) >> 2,
1ea893fd DW	35	(fc & IEEE80211_FCTL_STYPE) >> 4,
b2f4a2e3 JM	36	fc & IEEE80211_FCTL_TODS ? " [ToDS]" : "",
b2f4a2e3 JM	37	fc & IEEE80211_FCTL_FROMDS ? " [FromDS]" : "");
ff1d2767 JM	38
	39	if (skb->len < IEEE80211_DATA_HDR3_LEN) {
	40	printk("\n");
	41	return;
	42	}
	43
	44	printk(" dur=0x%04x seq=0x%04x\n", le16_to_cpu(hdr->duration_id),
1ea893fd	45	le16_to_cpu(hdr->seq_ctrl));
ff1d2767	46
e174961c JB	47	printk(KERN_DEBUG " A1=%pM", hdr->addr1);
	48	printk(" A2=%pM", hdr->addr2);
	49	printk(" A3=%pM", hdr->addr3);
ff1d2767	50	if (skb->len >= 30)
e174961c	51	printk(" A4=%pM", hdr->addr4);
ff1d2767 JM	52	printk("\n");
	53	}
	54
	55
	56	/* hard_start_xmit function for data interfaces (wlan#, wlan#wds#, wlan#sta)
	57	* Convert Ethernet header into a suitable IEEE 802.11 header depending on
	58	* device configuration. */
d0cf9c0d SH	59	netdev_tx_t hostap_data_start_xmit(struct sk_buff *skb,
d0cf9c0d SH	60	struct net_device *dev)
ff1d2767 JM	61	{
	62	struct hostap_interface *iface;
	63	local_info_t *local;
	64	int need_headroom, need_tailroom = 0;
1ea893fd	65	struct ieee80211_hdr hdr;
ff1d2767 JM	66	u16 fc, ethertype = 0;
	67	enum {
	68	WDS_NO = 0, WDS_OWN_FRAME, WDS_COMPLIANT_FRAME
	69	} use_wds = WDS_NO;
	70	u8 *encaps_data;
	71	int hdr_len, encaps_len, skip_header_bytes;
	72	int to_assoc_ap = 0;
	73	struct hostap_skb_tx_data *meta;
	74
	75	iface = netdev_priv(dev);
	76	local = iface->local;
	77
	78	if (skb->len < ETH_HLEN) {
	79	printk(KERN_DEBUG "%s: hostap_data_start_xmit: short skb "
	80	"(len=%d)\n", dev->name, skb->len);
	81	kfree_skb(skb);
ec634fe3	82	return NETDEV_TX_OK;
ff1d2767 JM	83	}
	84
	85	if (local->ddev != dev) {
	86	use_wds = (local->iw_mode == IW_MODE_MASTER &&
	87	!(local->wds_type & HOSTAP_WDS_STANDARD_FRAME)) ?
	88	WDS_OWN_FRAME : WDS_COMPLIANT_FRAME;
	89	if (dev == local->stadev) {
	90	to_assoc_ap = 1;
	91	use_wds = WDS_NO;
	92	} else if (dev == local->apdev) {
	93	printk(KERN_DEBUG "%s: prism2_tx: trying to use "
	94	"AP device with Ethernet net dev\n", dev->name);
	95	kfree_skb(skb);
ec634fe3	96	return NETDEV_TX_OK;
ff1d2767 JM	97	}
	98	} else {
	99	if (local->iw_mode == IW_MODE_REPEAT) {
	100	printk(KERN_DEBUG "%s: prism2_tx: trying to use "
	101	"non-WDS link in Repeater mode\n", dev->name);
	102	kfree_skb(skb);
ec634fe3	103	return NETDEV_TX_OK;
ff1d2767 JM	104	} else if (local->iw_mode == IW_MODE_INFRA &&
	105	(local->wds_type & HOSTAP_WDS_AP_CLIENT) &&
	106	memcmp(skb->data + ETH_ALEN, dev->dev_addr,
	107	ETH_ALEN) != 0) {
	108	/* AP client mode: send frames with foreign src addr
	109	* using 4-addr WDS frames */
	110	use_wds = WDS_COMPLIANT_FRAME;
	111	}
	112	}
	113
	114	/* Incoming skb->data: dst_addr[6], src_addr[6], proto[2], payload
	115	* ==>
	116	* Prism2 TX frame with 802.11 header:
	117	* txdesc (address order depending on used mode; includes dst_addr and
	118	* src_addr), possible encapsulation (RFC1042/Bridge-Tunnel;
	119	* proto[2], payload {, possible addr4[6]} */
	120
	121	ethertype = (skb->data[12] << 8) \| skb->data[13];
	122
	123	memset(&hdr, 0, sizeof(hdr));
	124
	125	/* Length of data after IEEE 802.11 header */
	126	encaps_data = NULL;
	127	encaps_len = 0;
	128	skip_header_bytes = ETH_HLEN;
	129	if (ethertype == ETH_P_AARP \|\| ethertype == ETH_P_IPX) {
	130	encaps_data = bridge_tunnel_header;
	131	encaps_len = sizeof(bridge_tunnel_header);
	132	skip_header_bytes -= 2;
	133	} else if (ethertype >= 0x600) {
	134	encaps_data = rfc1042_header;
	135	encaps_len = sizeof(rfc1042_header);
	136	skip_header_bytes -= 2;
	137	}
	138
4339d328	139	fc = IEEE80211_FTYPE_DATA \| IEEE80211_STYPE_DATA;
ff1d2767 JM	140	hdr_len = IEEE80211_DATA_HDR3_LEN;
	141
	142	if (use_wds != WDS_NO) {
	143	/* Note! Prism2 station firmware has problems with sending real
	144	* 802.11 frames with four addresses; until these problems can
	145	* be fixed or worked around, 4-addr frames needed for WDS are
	146	* using incompatible format: FromDS flag is not set and the
	147	* fourth address is added after the frame payload; it is
	148	* assumed, that the receiving station knows how to handle this
	149	* frame format */
	150
	151	if (use_wds == WDS_COMPLIANT_FRAME) {
b2f4a2e3	152	fc \|= IEEE80211_FCTL_FROMDS \| IEEE80211_FCTL_TODS;
ff1d2767 JM	153	/* From&To DS: Addr1 = RA, Addr2 = TA, Addr3 = DA,
ff1d2767 JM	154	* Addr4 = SA */
d626f62b ACM	155	skb_copy_from_linear_data_offset(skb, ETH_ALEN,
d626f62b ACM	156	&hdr.addr4, ETH_ALEN);
ff1d2767 JM	157	hdr_len += ETH_ALEN;
	158	} else {
	159	/* bogus 4-addr format to workaround Prism2 station
	160	* f/w bug */
b2f4a2e3	161	fc \|= IEEE80211_FCTL_TODS;
ff1d2767 JM	162	/* From DS: Addr1 = DA (used as RA),
	163	* Addr2 = BSSID (used as TA), Addr3 = SA (used as DA),
	164	*/
	165
	166	/* SA from skb->data + ETH_ALEN will be added after
	167	* frame payload; use hdr.addr4 as a temporary buffer
	168	*/
d626f62b ACM	169	skb_copy_from_linear_data_offset(skb, ETH_ALEN,
d626f62b ACM	170	&hdr.addr4, ETH_ALEN);
ff1d2767 JM	171	need_tailroom += ETH_ALEN;
	172	}
	173
	174	/* send broadcast and multicast frames to broadcast RA, if
	175	* configured; otherwise, use unicast RA of the WDS link */
	176	if ((local->wds_type & HOSTAP_WDS_BROADCAST_RA) &&
	177	skb->data[0] & 0x01)
	178	memset(&hdr.addr1, 0xff, ETH_ALEN);
	179	else if (iface->type == HOSTAP_INTERFACE_WDS)
	180	memcpy(&hdr.addr1, iface->u.wds.remote_addr,
	181	ETH_ALEN);
	182	else
	183	memcpy(&hdr.addr1, local->bssid, ETH_ALEN);
	184	memcpy(&hdr.addr2, dev->dev_addr, ETH_ALEN);
d626f62b	185	skb_copy_from_linear_data(skb, &hdr.addr3, ETH_ALEN);
ff1d2767	186	} else if (local->iw_mode == IW_MODE_MASTER && !to_assoc_ap) {
b2f4a2e3	187	fc \|= IEEE80211_FCTL_FROMDS;
ff1d2767	188	/* From DS: Addr1 = DA, Addr2 = BSSID, Addr3 = SA */
d626f62b	189	skb_copy_from_linear_data(skb, &hdr.addr1, ETH_ALEN);
ff1d2767	190	memcpy(&hdr.addr2, dev->dev_addr, ETH_ALEN);
d626f62b ACM	191	skb_copy_from_linear_data_offset(skb, ETH_ALEN, &hdr.addr3,
d626f62b ACM	192	ETH_ALEN);
ff1d2767	193	} else if (local->iw_mode == IW_MODE_INFRA \|\| to_assoc_ap) {
b2f4a2e3	194	fc \|= IEEE80211_FCTL_TODS;
ff1d2767 JM	195	/* To DS: Addr1 = BSSID, Addr2 = SA, Addr3 = DA */
	196	memcpy(&hdr.addr1, to_assoc_ap ?
	197	local->assoc_ap_addr : local->bssid, ETH_ALEN);
d626f62b ACM	198	skb_copy_from_linear_data_offset(skb, ETH_ALEN, &hdr.addr2,
	199	ETH_ALEN);
	200	skb_copy_from_linear_data(skb, &hdr.addr3, ETH_ALEN);
ff1d2767 JM	201	} else if (local->iw_mode == IW_MODE_ADHOC) {
ff1d2767 JM	202	/* not From/To DS: Addr1 = DA, Addr2 = SA, Addr3 = BSSID */
d626f62b ACM	203	skb_copy_from_linear_data(skb, &hdr.addr1, ETH_ALEN);
	204	skb_copy_from_linear_data_offset(skb, ETH_ALEN, &hdr.addr2,
	205	ETH_ALEN);
ff1d2767 JM	206	memcpy(&hdr.addr3, local->bssid, ETH_ALEN);
	207	}
	208
1ea893fd	209	hdr.frame_control = cpu_to_le16(fc);
ff1d2767 JM	210
	211	skb_pull(skb, skip_header_bytes);
	212	need_headroom = local->func->need_tx_headroom + hdr_len + encaps_len;
	213	if (skb_tailroom(skb) < need_tailroom) {
	214	skb = skb_unshare(skb, GFP_ATOMIC);
	215	if (skb == NULL) {
	216	iface->stats.tx_dropped++;
ec634fe3	217	return NETDEV_TX_OK;
ff1d2767 JM	218	}
	219	if (pskb_expand_head(skb, need_headroom, need_tailroom,
	220	GFP_ATOMIC)) {
	221	kfree_skb(skb);
	222	iface->stats.tx_dropped++;
ec634fe3	223	return NETDEV_TX_OK;
ff1d2767 JM	224	}
	225	} else if (skb_headroom(skb) < need_headroom) {
	226	struct sk_buff *tmp = skb;
	227	skb = skb_realloc_headroom(skb, need_headroom);
	228	kfree_skb(tmp);
	229	if (skb == NULL) {
	230	iface->stats.tx_dropped++;
ec634fe3	231	return NETDEV_TX_OK;
ff1d2767 JM	232	}
	233	} else {
	234	skb = skb_unshare(skb, GFP_ATOMIC);
	235	if (skb == NULL) {
	236	iface->stats.tx_dropped++;
ec634fe3	237	return NETDEV_TX_OK;
ff1d2767 JM	238	}
	239	}
	240
	241	if (encaps_data)
	242	memcpy(skb_push(skb, encaps_len), encaps_data, encaps_len);
	243	memcpy(skb_push(skb, hdr_len), &hdr, hdr_len);
	244	if (use_wds == WDS_OWN_FRAME) {
	245	memcpy(skb_put(skb, ETH_ALEN), &hdr.addr4, ETH_ALEN);
	246	}
	247
	248	iface->stats.tx_packets++;
	249	iface->stats.tx_bytes += skb->len;
	250
459a98ed	251	skb_reset_mac_header(skb);
ff1d2767 JM	252	meta = (struct hostap_skb_tx_data *) skb->cb;
	253	memset(meta, 0, sizeof(*meta));
	254	meta->magic = HOSTAP_SKB_TX_DATA_MAGIC;
5bee720f JM	255	if (use_wds)
5bee720f JM	256	meta->flags \|= HOSTAP_TX_FLAGS_WDS;
ff1d2767 JM	257	meta->ethertype = ethertype;
	258	meta->iface = iface;
	259
	260	/* Send IEEE 802.11 encapsulated frame using the master radio device */
	261	skb->dev = local->dev;
	262	dev_queue_xmit(skb);
ec634fe3	263	return NETDEV_TX_OK;
ff1d2767 JM	264	}
	265
	266
	267	/* hard_start_xmit function for hostapd wlan#ap interfaces */
d0cf9c0d SH	268	netdev_tx_t hostap_mgmt_start_xmit(struct sk_buff *skb,
d0cf9c0d SH	269	struct net_device *dev)
ff1d2767 JM	270	{
	271	struct hostap_interface *iface;
	272	local_info_t *local;
	273	struct hostap_skb_tx_data *meta;
1ea893fd	274	struct ieee80211_hdr *hdr;
ff1d2767 JM	275	u16 fc;
	276
	277	iface = netdev_priv(dev);
	278	local = iface->local;
	279
	280	if (skb->len < 10) {
	281	printk(KERN_DEBUG "%s: hostap_mgmt_start_xmit: short skb "
	282	"(len=%d)\n", dev->name, skb->len);
	283	kfree_skb(skb);
ec634fe3	284	return NETDEV_TX_OK;
ff1d2767 JM	285	}
	286
	287	iface->stats.tx_packets++;
	288	iface->stats.tx_bytes += skb->len;
	289
	290	meta = (struct hostap_skb_tx_data *) skb->cb;
	291	memset(meta, 0, sizeof(*meta));
	292	meta->magic = HOSTAP_SKB_TX_DATA_MAGIC;
	293	meta->iface = iface;
	294
	295	if (skb->len >= IEEE80211_DATA_HDR3_LEN + sizeof(rfc1042_header) + 2) {
1ea893fd DW	296	hdr = (struct ieee80211_hdr *) skb->data;
	297	fc = le16_to_cpu(hdr->frame_control);
	298	if (ieee80211_is_data(hdr->frame_control) &&
	299	(fc & IEEE80211_FCTL_STYPE) == IEEE80211_STYPE_DATA) {
ff1d2767 JM	300	u8 *pos = &skb->data[IEEE80211_DATA_HDR3_LEN +
	301	sizeof(rfc1042_header)];
	302	meta->ethertype = (pos[0] << 8) \| pos[1];
	303	}
	304	}
	305
	306	/* Send IEEE 802.11 encapsulated frame using the master radio device */
	307	skb->dev = local->dev;
	308	dev_queue_xmit(skb);
ec634fe3	309	return NETDEV_TX_OK;
ff1d2767 JM	310	}
	311
	312
	313	/* Called only from software IRQ */
79058aca	314	static struct sk_buff * hostap_tx_encrypt(struct sk_buff *skb,
274bfb8d	315	struct lib80211_crypt_data *crypt)
ff1d2767 JM	316	{
	317	struct hostap_interface *iface;
	318	local_info_t *local;
1ea893fd	319	struct ieee80211_hdr *hdr;
d7ea3be5	320	int prefix_len, postfix_len, hdr_len, res;
ff1d2767 JM	321
	322	iface = netdev_priv(skb->dev);
	323	local = iface->local;
	324
	325	if (skb->len < IEEE80211_DATA_HDR3_LEN) {
	326	kfree_skb(skb);
	327	return NULL;
	328	}
	329
	330	if (local->tkip_countermeasures &&
79058aca	331	strcmp(crypt->ops->name, "TKIP") == 0) {
1ea893fd	332	hdr = (struct ieee80211_hdr *) skb->data;
ff1d2767 JM	333	if (net_ratelimit()) {
ff1d2767 JM	334	printk(KERN_DEBUG "%s: TKIP countermeasures: dropped "
e174961c JB	335	"TX packet to %pM\n",
e174961c JB	336	local->dev->name, hdr->addr1);
ff1d2767 JM	337	}
	338	kfree_skb(skb);
	339	return NULL;
	340	}
	341
	342	skb = skb_unshare(skb, GFP_ATOMIC);
	343	if (skb == NULL)
	344	return NULL;
	345
d7ea3be5 BCR	346	prefix_len = crypt->ops->extra_mpdu_prefix_len +
	347	crypt->ops->extra_msdu_prefix_len;
	348	postfix_len = crypt->ops->extra_mpdu_postfix_len +
	349	crypt->ops->extra_msdu_postfix_len;
	350	if ((skb_headroom(skb) < prefix_len \|\|
	351	skb_tailroom(skb) < postfix_len) &&
	352	pskb_expand_head(skb, prefix_len, postfix_len, GFP_ATOMIC)) {
ff1d2767 JM	353	kfree_skb(skb);
	354	return NULL;
	355	}
	356
1ea893fd DW	357	hdr = (struct ieee80211_hdr *) skb->data;
1ea893fd DW	358	hdr_len = hostap_80211_get_hdrlen(hdr->frame_control);
ff1d2767 JM	359
	360	/* Host-based IEEE 802.11 fragmentation for TX is not yet supported, so
	361	* call both MSDU and MPDU encryption functions from here. */
	362	atomic_inc(&crypt->refcnt);
	363	res = 0;
	364	if (crypt->ops->encrypt_msdu)
	365	res = crypt->ops->encrypt_msdu(skb, hdr_len, crypt->priv);
	366	if (res == 0 && crypt->ops->encrypt_mpdu)
	367	res = crypt->ops->encrypt_mpdu(skb, hdr_len, crypt->priv);
	368	atomic_dec(&crypt->refcnt);
	369	if (res < 0) {
	370	kfree_skb(skb);
	371	return NULL;
	372	}
	373
	374	return skb;
	375	}
	376
	377
	378	/* hard_start_xmit function for master radio interface wifi#.
	379	* AP processing (TX rate control, power save buffering, etc.).
	380	* Use hardware TX function to send the frame. */
d0cf9c0d SH	381	netdev_tx_t hostap_master_start_xmit(struct sk_buff *skb,
d0cf9c0d SH	382	struct net_device *dev)
ff1d2767 JM	383	{
	384	struct hostap_interface *iface;
	385	local_info_t *local;
d0cf9c0d	386	netdev_tx_t ret = NETDEV_TX_BUSY;
ff1d2767 JM	387	u16 fc;
	388	struct hostap_tx_data tx;
	389	ap_tx_ret tx_ret;
	390	struct hostap_skb_tx_data *meta;
	391	int no_encrypt = 0;
1ea893fd	392	struct ieee80211_hdr *hdr;
ff1d2767 JM	393
	394	iface = netdev_priv(dev);
	395	local = iface->local;
	396
	397	tx.skb = skb;
	398	tx.sta_ptr = NULL;
	399
	400	meta = (struct hostap_skb_tx_data *) skb->cb;
	401	if (meta->magic != HOSTAP_SKB_TX_DATA_MAGIC) {
	402	printk(KERN_DEBUG "%s: invalid skb->cb magic (0x%08x, "
	403	"expected 0x%08x)\n",
	404	dev->name, meta->magic, HOSTAP_SKB_TX_DATA_MAGIC);
ec634fe3	405	ret = NETDEV_TX_OK;
ff1d2767 JM	406	iface->stats.tx_dropped++;
	407	goto fail;
	408	}
	409
	410	if (local->host_encrypt) {
	411	/* Set crypt to default algorithm and key; will be replaced in
	412	* AP code if STA has own alg/key */
274bfb8d	413	tx.crypt = local->crypt_info.crypt[local->crypt_info.tx_keyidx];
ff1d2767 JM	414	tx.host_encrypt = 1;
	415	} else {
	416	tx.crypt = NULL;
	417	tx.host_encrypt = 0;
	418	}
	419
	420	if (skb->len < 24) {
	421	printk(KERN_DEBUG "%s: hostap_master_start_xmit: short skb "
	422	"(len=%d)\n", dev->name, skb->len);
ec634fe3	423	ret = NETDEV_TX_OK;
ff1d2767 JM	424	iface->stats.tx_dropped++;
	425	goto fail;
	426	}
	427
	428	/* FIX (?):
	429	* Wi-Fi 802.11b test plan suggests that AP should ignore power save
	430	* bit in authentication and (re)association frames and assume tha
	431	* STA remains awake for the response. */
	432	tx_ret = hostap_handle_sta_tx(local, &tx);
	433	skb = tx.skb;
	434	meta = (struct hostap_skb_tx_data *) skb->cb;
1ea893fd DW	435	hdr = (struct ieee80211_hdr *) skb->data;
1ea893fd DW	436	fc = le16_to_cpu(hdr->frame_control);
ff1d2767 JM	437	switch (tx_ret) {
	438	case AP_TX_CONTINUE:
	439	break;
	440	case AP_TX_CONTINUE_NOT_AUTHORIZED:
	441	if (local->ieee_802_1x &&
1ea893fd	442	ieee80211_is_data(hdr->frame_control) &&
5bee720f JM	443	meta->ethertype != ETH_P_PAE &&
5bee720f JM	444	!(meta->flags & HOSTAP_TX_FLAGS_WDS)) {
ff1d2767 JM	445	printk(KERN_DEBUG "%s: dropped frame to unauthorized "
	446	"port (IEEE 802.1X): ethertype=0x%04x\n",
	447	dev->name, meta->ethertype);
	448	hostap_dump_tx_80211(dev->name, skb);
	449
ec634fe3	450	ret = NETDEV_TX_OK; /* drop packet */
ff1d2767 JM	451	iface->stats.tx_dropped++;
	452	goto fail;
	453	}
	454	break;
	455	case AP_TX_DROP:
ec634fe3	456	ret = NETDEV_TX_OK; /* drop packet */
ff1d2767 JM	457	iface->stats.tx_dropped++;
	458	goto fail;
	459	case AP_TX_RETRY:
	460	goto fail;
	461	case AP_TX_BUFFERED:
	462	/* do not free skb here, it will be freed when the
	463	* buffered frame is sent/timed out */
ec634fe3	464	ret = NETDEV_TX_OK;
ff1d2767 JM	465	goto tx_exit;
	466	}
	467
	468	/* Request TX callback if protocol version is 2 in 802.11 header;
	469	* this version 2 is a special case used between hostapd and kernel
	470	* driver */
b2f4a2e3	471	if (((fc & IEEE80211_FCTL_VERS) == BIT(1)) &&
ff1d2767 JM	472	local->ap && local->ap->tx_callback_idx && meta->tx_cb_idx == 0) {
	473	meta->tx_cb_idx = local->ap->tx_callback_idx;
	474
	475	/* remove special version from the frame header */
b2f4a2e3	476	fc &= ~IEEE80211_FCTL_VERS;
1ea893fd	477	hdr->frame_control = cpu_to_le16(fc);
ff1d2767 JM	478	}
ff1d2767 JM	479
1ea893fd	480	if (!ieee80211_is_data(hdr->frame_control)) {
ff1d2767 JM	481	no_encrypt = 1;
	482	tx.crypt = NULL;
	483	}
	484
	485	if (local->ieee_802_1x && meta->ethertype == ETH_P_PAE && tx.crypt &&
cfa146e4	486	!(fc & IEEE80211_FCTL_PROTECTED)) {
ff1d2767 JM	487	no_encrypt = 1;
	488	PDEBUG(DEBUG_EXTRA2, "%s: TX: IEEE 802.1X - passing "
	489	"unencrypted EAPOL frame\n", dev->name);
	490	tx.crypt = NULL; /* no encryption for IEEE 802.1X frames */
	491	}
	492
	493	if (tx.crypt && (!tx.crypt->ops \|\| !tx.crypt->ops->encrypt_mpdu))
	494	tx.crypt = NULL;
274bfb8d JL	495	else if ((tx.crypt \|\|
	496	local->crypt_info.crypt[local->crypt_info.tx_keyidx]) &&
	497	!no_encrypt) {
ff1d2767 JM	498	/* Add ISWEP flag both for firmware and host based encryption
ff1d2767 JM	499	*/
831a179f	500	fc \|= IEEE80211_FCTL_PROTECTED;
1ea893fd	501	hdr->frame_control = cpu_to_le16(fc);
ff1d2767	502	} else if (local->drop_unencrypted &&
1ea893fd	503	ieee80211_is_data(hdr->frame_control) &&
ff1d2767 JM	504	meta->ethertype != ETH_P_PAE) {
	505	if (net_ratelimit()) {
	506	printk(KERN_DEBUG "%s: dropped unencrypted TX data "
	507	"frame (drop_unencrypted=1)\n", dev->name);
	508	}
	509	iface->stats.tx_dropped++;
ec634fe3	510	ret = NETDEV_TX_OK;
ff1d2767 JM	511	goto fail;
	512	}
	513
	514	if (tx.crypt) {
	515	skb = hostap_tx_encrypt(skb, tx.crypt);
	516	if (skb == NULL) {
	517	printk(KERN_DEBUG "%s: TX - encryption failed\n",
	518	dev->name);
ec634fe3	519	ret = NETDEV_TX_OK;
ff1d2767 JM	520	goto fail;
	521	}
	522	meta = (struct hostap_skb_tx_data *) skb->cb;
	523	if (meta->magic != HOSTAP_SKB_TX_DATA_MAGIC) {
	524	printk(KERN_DEBUG "%s: invalid skb->cb magic (0x%08x, "
	525	"expected 0x%08x) after hostap_tx_encrypt\n",
	526	dev->name, meta->magic,
	527	HOSTAP_SKB_TX_DATA_MAGIC);
ec634fe3	528	ret = NETDEV_TX_OK;
ff1d2767 JM	529	iface->stats.tx_dropped++;
	530	goto fail;
	531	}
	532	}
	533
	534	if (local->func->tx == NULL \|\| local->func->tx(skb, dev)) {
ec634fe3	535	ret = NETDEV_TX_OK;
ff1d2767 JM	536	iface->stats.tx_dropped++;
ff1d2767 JM	537	} else {
ec634fe3	538	ret = NETDEV_TX_OK;
ff1d2767 JM	539	iface->stats.tx_packets++;
	540	iface->stats.tx_bytes += skb->len;
	541	}
	542
	543	fail:
ec634fe3	544	if (ret == NETDEV_TX_OK && skb)
ff1d2767 JM	545	dev_kfree_skb(skb);
	546	tx_exit:
	547	if (tx.sta_ptr)
	548	hostap_handle_sta_release(tx.sta_ptr);
	549	return ret;
	550	}
	551
	552
ff1d2767	553	EXPORT_SYMBOL(hostap_master_start_xmit);