[mirror_ubuntu-bionic-kernel.git] / drivers / net / wireless / intersil / hostap / hostap_80211_tx.c

// SPDX-License-Identifier: GPL-2.0
#include <linux/slab.h>
#include <linux/export.h>
#include <linux/etherdevice.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) &&
			   !ether_addr_equal(skb->data + ETH_ALEN, dev->dev_addr)) {
			/* 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) &&
		    is_multicast_ether_addr(skb->data))
			eth_broadcast_addr(hdr.addr1);
		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) {
		skb_put_data(skb, &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
b2441318	1	// SPDX-License-Identifier: GPL-2.0
5a0e3ad6	2	#include <linux/slab.h>
ee40fa06	3	#include <linux/export.h>
d22fbd70	4	#include <linux/etherdevice.h>
5a0e3ad6	5
5fad5a2e AB	6	#include "hostap_80211.h"
	7	#include "hostap_common.h"
	8	#include "hostap_wlan.h"
	9	#include "hostap.h"
	10	#include "hostap_ap.h"
	11
	12	/* See IEEE 802.1H for LLC/SNAP encapsulation/decapsulation */
	13	/* Ethernet-II snap header (RFC1042 for most EtherTypes) */
	14	static unsigned char rfc1042_header[] =
	15	{ 0xaa, 0xaa, 0x03, 0x00, 0x00, 0x00 };
	16	/* Bridge-Tunnel header (for EtherTypes ETH_P_AARP and ETH_P_IPX) */
	17	static unsigned char bridge_tunnel_header[] =
	18	{ 0xaa, 0xaa, 0x03, 0x00, 0x00, 0xf8 };
	19	/* No encapsulation header if EtherType < 0x600 (=length) */
	20
ff1d2767 JM	21	void hostap_dump_tx_80211(const char name, struct sk_buff skb)
ff1d2767 JM	22	{
1ea893fd	23	struct ieee80211_hdr *hdr;
ff1d2767 JM	24	u16 fc;
ff1d2767 JM	25
1ea893fd	26	hdr = (struct ieee80211_hdr *) skb->data;
ff1d2767 JM	27
	28	printk(KERN_DEBUG "%s: TX len=%d jiffies=%ld\n",
	29	name, skb->len, jiffies);
	30
	31	if (skb->len < 2)
	32	return;
	33
1ea893fd	34	fc = le16_to_cpu(hdr->frame_control);
ff1d2767	35	printk(KERN_DEBUG " FC=0x%04x (type=%d:%d)%s%s",
1ea893fd DW	36	fc, (fc & IEEE80211_FCTL_FTYPE) >> 2,
1ea893fd DW	37	(fc & IEEE80211_FCTL_STYPE) >> 4,
b2f4a2e3 JM	38	fc & IEEE80211_FCTL_TODS ? " [ToDS]" : "",
b2f4a2e3 JM	39	fc & IEEE80211_FCTL_FROMDS ? " [FromDS]" : "");
ff1d2767 JM	40
	41	if (skb->len < IEEE80211_DATA_HDR3_LEN) {
	42	printk("\n");
	43	return;
	44	}
	45
	46	printk(" dur=0x%04x seq=0x%04x\n", le16_to_cpu(hdr->duration_id),
1ea893fd	47	le16_to_cpu(hdr->seq_ctrl));
ff1d2767	48
e174961c JB	49	printk(KERN_DEBUG " A1=%pM", hdr->addr1);
	50	printk(" A2=%pM", hdr->addr2);
	51	printk(" A3=%pM", hdr->addr3);
ff1d2767	52	if (skb->len >= 30)
e174961c	53	printk(" A4=%pM", hdr->addr4);
ff1d2767 JM	54	printk("\n");
	55	}
	56
	57
	58	/* hard_start_xmit function for data interfaces (wlan#, wlan#wds#, wlan#sta)
	59	* Convert Ethernet header into a suitable IEEE 802.11 header depending on
	60	* device configuration. */
d0cf9c0d SH	61	netdev_tx_t hostap_data_start_xmit(struct sk_buff *skb,
d0cf9c0d SH	62	struct net_device *dev)
ff1d2767 JM	63	{
	64	struct hostap_interface *iface;
	65	local_info_t *local;
	66	int need_headroom, need_tailroom = 0;
1ea893fd	67	struct ieee80211_hdr hdr;
ff1d2767 JM	68	u16 fc, ethertype = 0;
	69	enum {
	70	WDS_NO = 0, WDS_OWN_FRAME, WDS_COMPLIANT_FRAME
	71	} use_wds = WDS_NO;
	72	u8 *encaps_data;
	73	int hdr_len, encaps_len, skip_header_bytes;
	74	int to_assoc_ap = 0;
	75	struct hostap_skb_tx_data *meta;
	76
	77	iface = netdev_priv(dev);
	78	local = iface->local;
	79
	80	if (skb->len < ETH_HLEN) {
	81	printk(KERN_DEBUG "%s: hostap_data_start_xmit: short skb "
	82	"(len=%d)\n", dev->name, skb->len);
	83	kfree_skb(skb);
ec634fe3	84	return NETDEV_TX_OK;
ff1d2767 JM	85	}
	86
	87	if (local->ddev != dev) {
	88	use_wds = (local->iw_mode == IW_MODE_MASTER &&
	89	!(local->wds_type & HOSTAP_WDS_STANDARD_FRAME)) ?
	90	WDS_OWN_FRAME : WDS_COMPLIANT_FRAME;
	91	if (dev == local->stadev) {
	92	to_assoc_ap = 1;
	93	use_wds = WDS_NO;
	94	} else if (dev == local->apdev) {
	95	printk(KERN_DEBUG "%s: prism2_tx: trying to use "
	96	"AP device with Ethernet net dev\n", dev->name);
	97	kfree_skb(skb);
ec634fe3	98	return NETDEV_TX_OK;
ff1d2767 JM	99	}
	100	} else {
	101	if (local->iw_mode == IW_MODE_REPEAT) {
	102	printk(KERN_DEBUG "%s: prism2_tx: trying to use "
	103	"non-WDS link in Repeater mode\n", dev->name);
	104	kfree_skb(skb);
ec634fe3	105	return NETDEV_TX_OK;
ff1d2767 JM	106	} else if (local->iw_mode == IW_MODE_INFRA &&
ff1d2767 JM	107	(local->wds_type & HOSTAP_WDS_AP_CLIENT) &&
d22fbd70	108	!ether_addr_equal(skb->data + ETH_ALEN, dev->dev_addr)) {
ff1d2767 JM	109	/* AP client mode: send frames with foreign src addr
	110	* using 4-addr WDS frames */
	111	use_wds = WDS_COMPLIANT_FRAME;
	112	}
	113	}
	114
	115	/* Incoming skb->data: dst_addr[6], src_addr[6], proto[2], payload
	116	* ==>
	117	* Prism2 TX frame with 802.11 header:
	118	* txdesc (address order depending on used mode; includes dst_addr and
	119	* src_addr), possible encapsulation (RFC1042/Bridge-Tunnel;
	120	* proto[2], payload {, possible addr4[6]} */
	121
	122	ethertype = (skb->data[12] << 8) \| skb->data[13];
	123
	124	memset(&hdr, 0, sizeof(hdr));
	125
	126	/* Length of data after IEEE 802.11 header */
	127	encaps_data = NULL;
	128	encaps_len = 0;
	129	skip_header_bytes = ETH_HLEN;
	130	if (ethertype == ETH_P_AARP \|\| ethertype == ETH_P_IPX) {
	131	encaps_data = bridge_tunnel_header;
	132	encaps_len = sizeof(bridge_tunnel_header);
	133	skip_header_bytes -= 2;
	134	} else if (ethertype >= 0x600) {
	135	encaps_data = rfc1042_header;
	136	encaps_len = sizeof(rfc1042_header);
	137	skip_header_bytes -= 2;
	138	}
	139
4339d328	140	fc = IEEE80211_FTYPE_DATA \| IEEE80211_STYPE_DATA;
ff1d2767 JM	141	hdr_len = IEEE80211_DATA_HDR3_LEN;
	142
	143	if (use_wds != WDS_NO) {
	144	/* Note! Prism2 station firmware has problems with sending real
	145	* 802.11 frames with four addresses; until these problems can
	146	* be fixed or worked around, 4-addr frames needed for WDS are
	147	* using incompatible format: FromDS flag is not set and the
	148	* fourth address is added after the frame payload; it is
	149	* assumed, that the receiving station knows how to handle this
	150	* frame format */
	151
	152	if (use_wds == WDS_COMPLIANT_FRAME) {
b2f4a2e3	153	fc \|= IEEE80211_FCTL_FROMDS \| IEEE80211_FCTL_TODS;
ff1d2767 JM	154	/* From&To DS: Addr1 = RA, Addr2 = TA, Addr3 = DA,
ff1d2767 JM	155	* Addr4 = SA */
d626f62b ACM	156	skb_copy_from_linear_data_offset(skb, ETH_ALEN,
d626f62b ACM	157	&hdr.addr4, ETH_ALEN);
ff1d2767 JM	158	hdr_len += ETH_ALEN;
	159	} else {
	160	/* bogus 4-addr format to workaround Prism2 station
	161	* f/w bug */
b2f4a2e3	162	fc \|= IEEE80211_FCTL_TODS;
ff1d2767 JM	163	/* From DS: Addr1 = DA (used as RA),
	164	* Addr2 = BSSID (used as TA), Addr3 = SA (used as DA),
	165	*/
	166
	167	/* SA from skb->data + ETH_ALEN will be added after
	168	* frame payload; use hdr.addr4 as a temporary buffer
	169	*/
d626f62b ACM	170	skb_copy_from_linear_data_offset(skb, ETH_ALEN,
d626f62b ACM	171	&hdr.addr4, ETH_ALEN);
ff1d2767 JM	172	need_tailroom += ETH_ALEN;
	173	}
	174
	175	/* send broadcast and multicast frames to broadcast RA, if
	176	* configured; otherwise, use unicast RA of the WDS link */
	177	if ((local->wds_type & HOSTAP_WDS_BROADCAST_RA) &&
93803b33 JP	178	is_multicast_ether_addr(skb->data))
93803b33 JP	179	eth_broadcast_addr(hdr.addr1);
ff1d2767 JM	180	else if (iface->type == HOSTAP_INTERFACE_WDS)
	181	memcpy(&hdr.addr1, iface->u.wds.remote_addr,
	182	ETH_ALEN);
	183	else
	184	memcpy(&hdr.addr1, local->bssid, ETH_ALEN);
	185	memcpy(&hdr.addr2, dev->dev_addr, ETH_ALEN);
d626f62b	186	skb_copy_from_linear_data(skb, &hdr.addr3, ETH_ALEN);
ff1d2767	187	} else if (local->iw_mode == IW_MODE_MASTER && !to_assoc_ap) {
b2f4a2e3	188	fc \|= IEEE80211_FCTL_FROMDS;
ff1d2767	189	/* From DS: Addr1 = DA, Addr2 = BSSID, Addr3 = SA */
d626f62b	190	skb_copy_from_linear_data(skb, &hdr.addr1, ETH_ALEN);
ff1d2767	191	memcpy(&hdr.addr2, dev->dev_addr, ETH_ALEN);
d626f62b ACM	192	skb_copy_from_linear_data_offset(skb, ETH_ALEN, &hdr.addr3,
d626f62b ACM	193	ETH_ALEN);
ff1d2767	194	} else if (local->iw_mode == IW_MODE_INFRA \|\| to_assoc_ap) {
b2f4a2e3	195	fc \|= IEEE80211_FCTL_TODS;
ff1d2767 JM	196	/* To DS: Addr1 = BSSID, Addr2 = SA, Addr3 = DA */
	197	memcpy(&hdr.addr1, to_assoc_ap ?
	198	local->assoc_ap_addr : local->bssid, ETH_ALEN);
d626f62b ACM	199	skb_copy_from_linear_data_offset(skb, ETH_ALEN, &hdr.addr2,
	200	ETH_ALEN);
	201	skb_copy_from_linear_data(skb, &hdr.addr3, ETH_ALEN);
ff1d2767 JM	202	} else if (local->iw_mode == IW_MODE_ADHOC) {
ff1d2767 JM	203	/* not From/To DS: Addr1 = DA, Addr2 = SA, Addr3 = BSSID */
d626f62b ACM	204	skb_copy_from_linear_data(skb, &hdr.addr1, ETH_ALEN);
	205	skb_copy_from_linear_data_offset(skb, ETH_ALEN, &hdr.addr2,
	206	ETH_ALEN);
ff1d2767 JM	207	memcpy(&hdr.addr3, local->bssid, ETH_ALEN);
	208	}
	209
1ea893fd	210	hdr.frame_control = cpu_to_le16(fc);
ff1d2767 JM	211
	212	skb_pull(skb, skip_header_bytes);
	213	need_headroom = local->func->need_tx_headroom + hdr_len + encaps_len;
	214	if (skb_tailroom(skb) < need_tailroom) {
	215	skb = skb_unshare(skb, GFP_ATOMIC);
	216	if (skb == NULL) {
	217	iface->stats.tx_dropped++;
ec634fe3	218	return NETDEV_TX_OK;
ff1d2767 JM	219	}
	220	if (pskb_expand_head(skb, need_headroom, need_tailroom,
	221	GFP_ATOMIC)) {
	222	kfree_skb(skb);
	223	iface->stats.tx_dropped++;
ec634fe3	224	return NETDEV_TX_OK;
ff1d2767 JM	225	}
	226	} else if (skb_headroom(skb) < need_headroom) {
	227	struct sk_buff *tmp = skb;
	228	skb = skb_realloc_headroom(skb, need_headroom);
	229	kfree_skb(tmp);
	230	if (skb == NULL) {
	231	iface->stats.tx_dropped++;
ec634fe3	232	return NETDEV_TX_OK;
ff1d2767 JM	233	}
	234	} else {
	235	skb = skb_unshare(skb, GFP_ATOMIC);
	236	if (skb == NULL) {
	237	iface->stats.tx_dropped++;
ec634fe3	238	return NETDEV_TX_OK;
ff1d2767 JM	239	}
	240	}
	241
	242	if (encaps_data)
	243	memcpy(skb_push(skb, encaps_len), encaps_data, encaps_len);
	244	memcpy(skb_push(skb, hdr_len), &hdr, hdr_len);
	245	if (use_wds == WDS_OWN_FRAME) {
59ae1d12	246	skb_put_data(skb, &hdr.addr4, ETH_ALEN);
ff1d2767 JM	247	}
	248
	249	iface->stats.tx_packets++;
	250	iface->stats.tx_bytes += skb->len;
	251
459a98ed	252	skb_reset_mac_header(skb);
ff1d2767 JM	253	meta = (struct hostap_skb_tx_data *) skb->cb;
	254	memset(meta, 0, sizeof(*meta));
	255	meta->magic = HOSTAP_SKB_TX_DATA_MAGIC;
5bee720f JM	256	if (use_wds)
5bee720f JM	257	meta->flags \|= HOSTAP_TX_FLAGS_WDS;
ff1d2767 JM	258	meta->ethertype = ethertype;
	259	meta->iface = iface;
	260
	261	/* Send IEEE 802.11 encapsulated frame using the master radio device */
	262	skb->dev = local->dev;
	263	dev_queue_xmit(skb);
ec634fe3	264	return NETDEV_TX_OK;
ff1d2767 JM	265	}
	266
	267
	268	/* hard_start_xmit function for hostapd wlan#ap interfaces */
d0cf9c0d SH	269	netdev_tx_t hostap_mgmt_start_xmit(struct sk_buff *skb,
d0cf9c0d SH	270	struct net_device *dev)
ff1d2767 JM	271	{
	272	struct hostap_interface *iface;
	273	local_info_t *local;
	274	struct hostap_skb_tx_data *meta;
1ea893fd	275	struct ieee80211_hdr *hdr;
ff1d2767 JM	276	u16 fc;
	277
	278	iface = netdev_priv(dev);
	279	local = iface->local;
	280
	281	if (skb->len < 10) {
	282	printk(KERN_DEBUG "%s: hostap_mgmt_start_xmit: short skb "
	283	"(len=%d)\n", dev->name, skb->len);
	284	kfree_skb(skb);
ec634fe3	285	return NETDEV_TX_OK;
ff1d2767 JM	286	}
	287
	288	iface->stats.tx_packets++;
	289	iface->stats.tx_bytes += skb->len;
	290
	291	meta = (struct hostap_skb_tx_data *) skb->cb;
	292	memset(meta, 0, sizeof(*meta));
	293	meta->magic = HOSTAP_SKB_TX_DATA_MAGIC;
	294	meta->iface = iface;
	295
	296	if (skb->len >= IEEE80211_DATA_HDR3_LEN + sizeof(rfc1042_header) + 2) {
1ea893fd DW	297	hdr = (struct ieee80211_hdr *) skb->data;
	298	fc = le16_to_cpu(hdr->frame_control);
	299	if (ieee80211_is_data(hdr->frame_control) &&
	300	(fc & IEEE80211_FCTL_STYPE) == IEEE80211_STYPE_DATA) {
ff1d2767 JM	301	u8 *pos = &skb->data[IEEE80211_DATA_HDR3_LEN +
	302	sizeof(rfc1042_header)];
	303	meta->ethertype = (pos[0] << 8) \| pos[1];
	304	}
	305	}
	306
	307	/* Send IEEE 802.11 encapsulated frame using the master radio device */
	308	skb->dev = local->dev;
	309	dev_queue_xmit(skb);
ec634fe3	310	return NETDEV_TX_OK;
ff1d2767 JM	311	}
	312
	313
	314	/* Called only from software IRQ */
79058aca	315	static struct sk_buff * hostap_tx_encrypt(struct sk_buff *skb,
274bfb8d	316	struct lib80211_crypt_data *crypt)
ff1d2767 JM	317	{
	318	struct hostap_interface *iface;
	319	local_info_t *local;
1ea893fd	320	struct ieee80211_hdr *hdr;
d7ea3be5	321	int prefix_len, postfix_len, hdr_len, res;
ff1d2767 JM	322
	323	iface = netdev_priv(skb->dev);
	324	local = iface->local;
	325
	326	if (skb->len < IEEE80211_DATA_HDR3_LEN) {
	327	kfree_skb(skb);
	328	return NULL;
	329	}
	330
	331	if (local->tkip_countermeasures &&
79058aca	332	strcmp(crypt->ops->name, "TKIP") == 0) {
1ea893fd	333	hdr = (struct ieee80211_hdr *) skb->data;
ff1d2767 JM	334	if (net_ratelimit()) {
ff1d2767 JM	335	printk(KERN_DEBUG "%s: TKIP countermeasures: dropped "
e174961c JB	336	"TX packet to %pM\n",
e174961c JB	337	local->dev->name, hdr->addr1);
ff1d2767 JM	338	}
	339	kfree_skb(skb);
	340	return NULL;
	341	}
	342
	343	skb = skb_unshare(skb, GFP_ATOMIC);
	344	if (skb == NULL)
	345	return NULL;
	346
d7ea3be5 BCR	347	prefix_len = crypt->ops->extra_mpdu_prefix_len +
	348	crypt->ops->extra_msdu_prefix_len;
	349	postfix_len = crypt->ops->extra_mpdu_postfix_len +
	350	crypt->ops->extra_msdu_postfix_len;
	351	if ((skb_headroom(skb) < prefix_len \|\|
	352	skb_tailroom(skb) < postfix_len) &&
	353	pskb_expand_head(skb, prefix_len, postfix_len, GFP_ATOMIC)) {
ff1d2767 JM	354	kfree_skb(skb);
	355	return NULL;
	356	}
	357
1ea893fd DW	358	hdr = (struct ieee80211_hdr *) skb->data;
1ea893fd DW	359	hdr_len = hostap_80211_get_hdrlen(hdr->frame_control);
ff1d2767 JM	360
	361	/* Host-based IEEE 802.11 fragmentation for TX is not yet supported, so
	362	* call both MSDU and MPDU encryption functions from here. */
	363	atomic_inc(&crypt->refcnt);
	364	res = 0;
	365	if (crypt->ops->encrypt_msdu)
	366	res = crypt->ops->encrypt_msdu(skb, hdr_len, crypt->priv);
	367	if (res == 0 && crypt->ops->encrypt_mpdu)
	368	res = crypt->ops->encrypt_mpdu(skb, hdr_len, crypt->priv);
	369	atomic_dec(&crypt->refcnt);
	370	if (res < 0) {
	371	kfree_skb(skb);
	372	return NULL;
	373	}
	374
	375	return skb;
	376	}
	377
	378
	379	/* hard_start_xmit function for master radio interface wifi#.
	380	* AP processing (TX rate control, power save buffering, etc.).
	381	* Use hardware TX function to send the frame. */
d0cf9c0d SH	382	netdev_tx_t hostap_master_start_xmit(struct sk_buff *skb,
d0cf9c0d SH	383	struct net_device *dev)
ff1d2767 JM	384	{
	385	struct hostap_interface *iface;
	386	local_info_t *local;
d0cf9c0d	387	netdev_tx_t ret = NETDEV_TX_BUSY;
ff1d2767 JM	388	u16 fc;
	389	struct hostap_tx_data tx;
	390	ap_tx_ret tx_ret;
	391	struct hostap_skb_tx_data *meta;
	392	int no_encrypt = 0;
1ea893fd	393	struct ieee80211_hdr *hdr;
ff1d2767 JM	394
	395	iface = netdev_priv(dev);
	396	local = iface->local;
	397
	398	tx.skb = skb;
	399	tx.sta_ptr = NULL;
	400
	401	meta = (struct hostap_skb_tx_data *) skb->cb;
	402	if (meta->magic != HOSTAP_SKB_TX_DATA_MAGIC) {
	403	printk(KERN_DEBUG "%s: invalid skb->cb magic (0x%08x, "
	404	"expected 0x%08x)\n",
	405	dev->name, meta->magic, HOSTAP_SKB_TX_DATA_MAGIC);
ec634fe3	406	ret = NETDEV_TX_OK;
ff1d2767 JM	407	iface->stats.tx_dropped++;
	408	goto fail;
	409	}
	410
	411	if (local->host_encrypt) {
	412	/* Set crypt to default algorithm and key; will be replaced in
	413	* AP code if STA has own alg/key */
274bfb8d	414	tx.crypt = local->crypt_info.crypt[local->crypt_info.tx_keyidx];
ff1d2767 JM	415	tx.host_encrypt = 1;
	416	} else {
	417	tx.crypt = NULL;
	418	tx.host_encrypt = 0;
	419	}
	420
	421	if (skb->len < 24) {
	422	printk(KERN_DEBUG "%s: hostap_master_start_xmit: short skb "
	423	"(len=%d)\n", dev->name, skb->len);
ec634fe3	424	ret = NETDEV_TX_OK;
ff1d2767 JM	425	iface->stats.tx_dropped++;
	426	goto fail;
	427	}
	428
	429	/* FIX (?):
	430	* Wi-Fi 802.11b test plan suggests that AP should ignore power save
	431	* bit in authentication and (re)association frames and assume tha
	432	* STA remains awake for the response. */
	433	tx_ret = hostap_handle_sta_tx(local, &tx);
	434	skb = tx.skb;
	435	meta = (struct hostap_skb_tx_data *) skb->cb;
1ea893fd DW	436	hdr = (struct ieee80211_hdr *) skb->data;
1ea893fd DW	437	fc = le16_to_cpu(hdr->frame_control);
ff1d2767 JM	438	switch (tx_ret) {
	439	case AP_TX_CONTINUE:
	440	break;
	441	case AP_TX_CONTINUE_NOT_AUTHORIZED:
	442	if (local->ieee_802_1x &&
1ea893fd	443	ieee80211_is_data(hdr->frame_control) &&
5bee720f JM	444	meta->ethertype != ETH_P_PAE &&
5bee720f JM	445	!(meta->flags & HOSTAP_TX_FLAGS_WDS)) {
ff1d2767 JM	446	printk(KERN_DEBUG "%s: dropped frame to unauthorized "
	447	"port (IEEE 802.1X): ethertype=0x%04x\n",
	448	dev->name, meta->ethertype);
	449	hostap_dump_tx_80211(dev->name, skb);
	450
ec634fe3	451	ret = NETDEV_TX_OK; /* drop packet */
ff1d2767 JM	452	iface->stats.tx_dropped++;
	453	goto fail;
	454	}
	455	break;
	456	case AP_TX_DROP:
ec634fe3	457	ret = NETDEV_TX_OK; /* drop packet */
ff1d2767 JM	458	iface->stats.tx_dropped++;
	459	goto fail;
	460	case AP_TX_RETRY:
	461	goto fail;
	462	case AP_TX_BUFFERED:
	463	/* do not free skb here, it will be freed when the
	464	* buffered frame is sent/timed out */
ec634fe3	465	ret = NETDEV_TX_OK;
ff1d2767 JM	466	goto tx_exit;
	467	}
	468
	469	/* Request TX callback if protocol version is 2 in 802.11 header;
	470	* this version 2 is a special case used between hostapd and kernel
	471	* driver */
b2f4a2e3	472	if (((fc & IEEE80211_FCTL_VERS) == BIT(1)) &&
ff1d2767 JM	473	local->ap && local->ap->tx_callback_idx && meta->tx_cb_idx == 0) {
	474	meta->tx_cb_idx = local->ap->tx_callback_idx;
	475
	476	/* remove special version from the frame header */
b2f4a2e3	477	fc &= ~IEEE80211_FCTL_VERS;
1ea893fd	478	hdr->frame_control = cpu_to_le16(fc);
ff1d2767 JM	479	}
ff1d2767 JM	480
1ea893fd	481	if (!ieee80211_is_data(hdr->frame_control)) {
ff1d2767 JM	482	no_encrypt = 1;
	483	tx.crypt = NULL;
	484	}
	485
	486	if (local->ieee_802_1x && meta->ethertype == ETH_P_PAE && tx.crypt &&
cfa146e4	487	!(fc & IEEE80211_FCTL_PROTECTED)) {
ff1d2767 JM	488	no_encrypt = 1;
	489	PDEBUG(DEBUG_EXTRA2, "%s: TX: IEEE 802.1X - passing "
	490	"unencrypted EAPOL frame\n", dev->name);
	491	tx.crypt = NULL; /* no encryption for IEEE 802.1X frames */
	492	}
	493
	494	if (tx.crypt && (!tx.crypt->ops \|\| !tx.crypt->ops->encrypt_mpdu))
	495	tx.crypt = NULL;
274bfb8d JL	496	else if ((tx.crypt \|\|
	497	local->crypt_info.crypt[local->crypt_info.tx_keyidx]) &&
	498	!no_encrypt) {
ff1d2767 JM	499	/* Add ISWEP flag both for firmware and host based encryption
ff1d2767 JM	500	*/
831a179f	501	fc \|= IEEE80211_FCTL_PROTECTED;
1ea893fd	502	hdr->frame_control = cpu_to_le16(fc);
ff1d2767	503	} else if (local->drop_unencrypted &&
1ea893fd	504	ieee80211_is_data(hdr->frame_control) &&
ff1d2767 JM	505	meta->ethertype != ETH_P_PAE) {
	506	if (net_ratelimit()) {
	507	printk(KERN_DEBUG "%s: dropped unencrypted TX data "
	508	"frame (drop_unencrypted=1)\n", dev->name);
	509	}
	510	iface->stats.tx_dropped++;
ec634fe3	511	ret = NETDEV_TX_OK;
ff1d2767 JM	512	goto fail;
	513	}
	514
	515	if (tx.crypt) {
	516	skb = hostap_tx_encrypt(skb, tx.crypt);
	517	if (skb == NULL) {
	518	printk(KERN_DEBUG "%s: TX - encryption failed\n",
	519	dev->name);
ec634fe3	520	ret = NETDEV_TX_OK;
ff1d2767 JM	521	goto fail;
	522	}
	523	meta = (struct hostap_skb_tx_data *) skb->cb;
	524	if (meta->magic != HOSTAP_SKB_TX_DATA_MAGIC) {
	525	printk(KERN_DEBUG "%s: invalid skb->cb magic (0x%08x, "
	526	"expected 0x%08x) after hostap_tx_encrypt\n",
	527	dev->name, meta->magic,
	528	HOSTAP_SKB_TX_DATA_MAGIC);
ec634fe3	529	ret = NETDEV_TX_OK;
ff1d2767 JM	530	iface->stats.tx_dropped++;
	531	goto fail;
	532	}
	533	}
	534
	535	if (local->func->tx == NULL \|\| local->func->tx(skb, dev)) {
ec634fe3	536	ret = NETDEV_TX_OK;
ff1d2767 JM	537	iface->stats.tx_dropped++;
ff1d2767 JM	538	} else {
ec634fe3	539	ret = NETDEV_TX_OK;
ff1d2767 JM	540	iface->stats.tx_packets++;
	541	iface->stats.tx_bytes += skb->len;
	542	}
	543
	544	fail:
ec634fe3	545	if (ret == NETDEV_TX_OK && skb)
ff1d2767 JM	546	dev_kfree_skb(skb);
	547	tx_exit:
	548	if (tx.sta_ptr)
	549	hostap_handle_sta_release(tx.sta_ptr);
	550	return ret;
	551	}
	552
	553
ff1d2767	554	EXPORT_SYMBOL(hostap_master_start_xmit);