drivers/net/wireless/hostap/hostap_80211_tx.c - arm/linux-arm64-legacy - Git at Google

 #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);
	#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);