net/ieee80211/softmac/ieee80211softmac_io.c - linux/kernel/git/gregkh/char-misc - Git at Google

 /*
  * Some parts based on code from net80211
  * Copyright (c) 2001 Atsushi Onoe
  * Copyright (c) 2002-2005 Sam Leffler, Errno Consulting
  * All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
  *    documentation and/or other materials provided with the distribution.
  * 3. The name of the author may not be used to endorse or promote products
  *    derived from this software without specific prior written permission.
  *
  * Alternatively, this software may be distributed under the terms of the
  * GNU General Public License ("GPL") version 2 as published by the Free
  * Software Foundation.
  *
  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  *
  */

 #include "ieee80211softmac_priv.h"

 /* Helper functions for inserting data into the frames */

 /*
  * Adds an ESSID element to the frame
  *
  */
 static u8 *
 ieee80211softmac_add_essid(u8 *dst, struct ieee80211softmac_essid *essid)
 {
 	if (essid) {
 		*dst++ = MFIE_TYPE_SSID;
 		*dst++ = essid->len;
 		memcpy(dst, essid->data, essid->len);
 		return dst+essid->len;
 	} else {
 		*dst++ = MFIE_TYPE_SSID;
 		*dst++ = 0;
 		return dst;
 	}
 }

 /* Adds Supported Rates and if required Extended Rates Information Element
  * to the frame, ASSUMES WE HAVE A SORTED LIST OF RATES */
 static u8 *
 ieee80211softmac_frame_add_rates(u8 *dst, const struct ieee80211softmac_ratesinfo *r)
 {
 	int cck_len, ofdm_len;
 	*dst++ = MFIE_TYPE_RATES;

 	for(cck_len=0; ieee80211_is_cck_rate(r->rates[cck_len]) && (cck_len < r->count);cck_len++);

 	if(cck_len > IEEE80211SOFTMAC_MAX_RATES_LEN)
 		cck_len = IEEE80211SOFTMAC_MAX_RATES_LEN;
 	*dst++ = cck_len;
 	memcpy(dst, r->rates, cck_len);
 	dst += cck_len;

 	if(cck_len < r->count){
 		for (ofdm_len=0; ieee80211_is_ofdm_rate(r->rates[ofdm_len + cck_len]) && (ofdm_len + cck_len < r->count); ofdm_len++);
 		if (ofdm_len > 0) {
 			if (ofdm_len > IEEE80211SOFTMAC_MAX_EX_RATES_LEN)
 				ofdm_len = IEEE80211SOFTMAC_MAX_EX_RATES_LEN;
 			*dst++ = MFIE_TYPE_RATES_EX;
 			*dst++ = ofdm_len;
 			memcpy(dst, r->rates + cck_len, ofdm_len);
 			dst += ofdm_len;
 		}
 	}
 	return dst;
 }

 /* Allocate a management frame */
 static u8 *
 ieee80211softmac_alloc_mgt(u32 size)
 {
 	u8 * data;

 	/* Add the header and FCS to the size */
 	size = size + IEEE80211_3ADDR_LEN;
 	if(size > IEEE80211_DATA_LEN)
 		return NULL;
 	/* Allocate the frame */
 	data = kzalloc(size, GFP_ATOMIC);
 	return data;
 }

 /*
  * Add a 2 Address Header
  */
 static void
 ieee80211softmac_hdr_2addr(struct ieee80211softmac_device *mac,
 	struct ieee80211_hdr_2addr *header, u32 type, u8 *dest)
 {
 	/* Fill in the frame control flags */
 	header->frame_ctl = cpu_to_le16(type);
 	/* Control packets always have WEP turned off */
 	if(type > IEEE80211_STYPE_CFENDACK && type < IEEE80211_STYPE_PSPOLL)
 		header->frame_ctl |= mac->ieee->sec.level ? cpu_to_le16(IEEE80211_FCTL_PROTECTED) : 0;

 	/* Fill in the duration */
 	header->duration_id = 0;
 	/* FIXME: How do I find this?
 	 * calculate. But most drivers just fill in 0 (except if it's a station id of course) */

 	/* Fill in the Destination Address */
 	if(dest == NULL)
 		memset(header->addr1, 0xFF, ETH_ALEN);
 	else
 		memcpy(header->addr1, dest, ETH_ALEN);
 	/* Fill in the Source Address */
 	memcpy(header->addr2, mac->ieee->dev->dev_addr, ETH_ALEN);

 }


 /* Add a 3 Address Header */
 static void
 ieee80211softmac_hdr_3addr(struct ieee80211softmac_device *mac,
 	struct ieee80211_hdr_3addr *header, u32 type, u8 *dest, u8 *bssid)
 {
 	/* This is common with 2addr, so use that instead */
 	ieee80211softmac_hdr_2addr(mac, (struct ieee80211_hdr_2addr *)header, type, dest);

 	/* Fill in the BSS ID */
 	if(bssid == NULL)
 		memset(header->addr3, 0xFF, ETH_ALEN);
 	else
 		memcpy(header->addr3, bssid, ETH_ALEN);

 	/* Fill in the sequence # */
 	/* FIXME: I need to add this to the softmac struct
 	 * shouldn't the sequence number be in ieee80211? */
 }

 static u16
 ieee80211softmac_capabilities(struct ieee80211softmac_device *mac,
 	struct ieee80211softmac_network *net)
 {
 	u16 capability = 0;

 	/* ESS and IBSS bits are set according to the current mode */
 	switch (mac->ieee->iw_mode) {
 	case IW_MODE_INFRA:
 		capability = cpu_to_le16(WLAN_CAPABILITY_ESS);
 		break;
 	case IW_MODE_ADHOC:
 		capability = cpu_to_le16(WLAN_CAPABILITY_IBSS);
 		break;
 	case IW_MODE_AUTO:
 		capability = net->capabilities &
 			(WLAN_CAPABILITY_ESS|WLAN_CAPABILITY_IBSS);
 		break;
 	default:
 		/* bleh. we don't ever go to these modes */
 		printk(KERN_ERR PFX "invalid iw_mode!\n");
 		break;
 	}

 	/* CF Pollable / CF Poll Request */
 	/* Needs to be implemented, for now, the 0's == not supported */

 	/* Privacy Bit */
 	capability |= mac->ieee->sec.level ?
 		cpu_to_le16(WLAN_CAPABILITY_PRIVACY) : 0;

 	/* Short Preamble */
 	/* Always supported: we probably won't ever be powering devices which
 	 * dont support this... */
 	capability |= WLAN_CAPABILITY_SHORT_PREAMBLE;

 	/* PBCC */
 	/* Not widely used */

 	/* Channel Agility */
 	/* Not widely used */

 	/* Short Slot */
 	/* Will be implemented later */

 	/* DSSS-OFDM */
 	/* Not widely used */

 	return capability;
 }

 /*****************************************************************************
  * Create Management packets
  *****************************************************************************/

 /* Creates an association request packet */
 static u32
 ieee80211softmac_assoc_req(struct ieee80211_assoc_request **pkt,
 	struct ieee80211softmac_device *mac, struct ieee80211softmac_network *net)
 {
 	u8 *data;
 	(*pkt) = (struct ieee80211_assoc_request *)ieee80211softmac_alloc_mgt(
 		2 +		/* Capability Info */
 		2 +	 	/* Listen Interval */
 		/* SSID IE */
 		1 + 1 + IW_ESSID_MAX_SIZE +
 		/* Rates IE */
 		1 + 1 + IEEE80211SOFTMAC_MAX_RATES_LEN +
 		/* Extended Rates IE */
 		1 + 1 + IEEE80211SOFTMAC_MAX_EX_RATES_LEN +
 		/* WPA IE if present */
 		mac->wpa.IElen
 		/* Other IE's?  Optional?
 		 * Yeah, probably need an extra IE parameter -- lots of vendors like to
 		 * fill in their own IEs */
 	);
 	if (unlikely((*pkt) == NULL))
 		return 0;
 	ieee80211softmac_hdr_3addr(mac, &((*pkt)->header), IEEE80211_STYPE_ASSOC_REQ, net->bssid, net->bssid);

 	/* Fill in the capabilities */
 	(*pkt)->capability = ieee80211softmac_capabilities(mac, net);

 	/* Fill in Listen Interval (?) */
 	(*pkt)->listen_interval = cpu_to_le16(10);

 	data = (u8 *)(*pkt)->info_element;
 	/* Add SSID */
 	data = ieee80211softmac_add_essid(data, &net->essid);
 	/* Add Rates */
 	data = ieee80211softmac_frame_add_rates(data, &mac->ratesinfo);
 	/* Add WPA IE */
 	if (mac->wpa.IElen && mac->wpa.IE) {
 		memcpy(data, mac->wpa.IE, mac->wpa.IElen);
 		data += mac->wpa.IElen;
 	}
 	/* Return the number of used bytes */
 	return (data - (u8*)(*pkt));
 }

 /* Create a reassociation request packet */
 static u32
 ieee80211softmac_reassoc_req(struct ieee80211_reassoc_request **pkt,
 	struct ieee80211softmac_device *mac, struct ieee80211softmac_network *net)
 {
 	u8 *data;
 	(*pkt) = (struct ieee80211_reassoc_request *)ieee80211softmac_alloc_mgt(
 		2 +		/* Capability Info */
 		2 +	 	/* Listen Interval */
 		ETH_ALEN +	/* AP MAC */
 		/* SSID IE */
 		1 + 1 + IW_ESSID_MAX_SIZE +
 		/* Rates IE */
 		1 + 1 + IEEE80211SOFTMAC_MAX_RATES_LEN +
 		/* Extended Rates IE */
 		1 + 1 + IEEE80211SOFTMAC_MAX_EX_RATES_LEN
 		/* Other IE's? */
 	);
 	if (unlikely((*pkt) == NULL))
 		return 0;
 	ieee80211softmac_hdr_3addr(mac, &((*pkt)->header), IEEE80211_STYPE_REASSOC_REQ, net->bssid, net->bssid);

 	/* Fill in the capabilities */
 	(*pkt)->capability = ieee80211softmac_capabilities(mac, net);

 	/* Fill in Listen Interval (?) */
 	(*pkt)->listen_interval = cpu_to_le16(10);
 	/* Fill in the current AP MAC */
 	memcpy((*pkt)->current_ap, mac->ieee->bssid, ETH_ALEN);

 	data = (u8 *)(*pkt)->info_element;
 	/* Add SSID */
 	data = ieee80211softmac_add_essid(data, &net->essid);
 	/* Add Rates */
 	data = ieee80211softmac_frame_add_rates(data, &mac->ratesinfo);
 	/* Return packet size */
 	return (data - (u8 *)(*pkt));
 }

 /* Create an authentication packet */
 static u32
 ieee80211softmac_auth(struct ieee80211_auth **pkt,
 	struct ieee80211softmac_device *mac, struct ieee80211softmac_network *net,
 	u16 transaction, u16 status, int *encrypt_mpdu)
 {
 	u8 *data;
 	int auth_mode = mac->ieee->sec.auth_mode;
 	int is_shared_response = (auth_mode == WLAN_AUTH_SHARED_KEY
 		&& transaction == IEEE80211SOFTMAC_AUTH_SHARED_RESPONSE);

 	/* Allocate Packet */
 	(*pkt) = (struct ieee80211_auth *)ieee80211softmac_alloc_mgt(
 		2 +		/* Auth Algorithm */
 		2 +		/* Auth Transaction Seq */
 		2 +		/* Status Code */
 		 /* Challenge Text IE */
 		(is_shared_response ? 1 + 1 + net->challenge_len : 0)
 	);
 	if (unlikely((*pkt) == NULL))
 		return 0;
 	ieee80211softmac_hdr_3addr(mac, &((*pkt)->header), IEEE80211_STYPE_AUTH, net->bssid, net->bssid);

 	/* Algorithm */
 	(*pkt)->algorithm = cpu_to_le16(auth_mode);
 	/* Transaction */
 	(*pkt)->transaction = cpu_to_le16(transaction);
 	/* Status */
 	(*pkt)->status = cpu_to_le16(status);

 	data = (u8 *)(*pkt)->info_element;
 	/* Challenge Text */
 	if (is_shared_response) {
 		*data = MFIE_TYPE_CHALLENGE;
 		data++;

 		/* Copy the challenge in */
 		*data = net->challenge_len;
 		data++;
 		memcpy(data, net->challenge, net->challenge_len);
 		data += net->challenge_len;

 		/* Make sure this frame gets encrypted with the shared key */
 		*encrypt_mpdu = 1;
 	} else
 		*encrypt_mpdu = 0;

 	/* Return the packet size */
 	return (data - (u8 *)(*pkt));
 }

 /* Create a disassocation or deauthentication packet */
 static u32
 ieee80211softmac_disassoc_deauth(struct ieee80211_disassoc **pkt,
 	struct ieee80211softmac_device *mac, struct ieee80211softmac_network *net,
 	u16 type, u16 reason)
 {
 	/* Allocate Packet */
 	(*pkt) = (struct ieee80211_disassoc *)ieee80211softmac_alloc_mgt(2);
 	if (unlikely((*pkt) == NULL))
 		return 0;
 	ieee80211softmac_hdr_3addr(mac, &((*pkt)->header), type, net->bssid, net->bssid);
 	/* Reason */
 	(*pkt)->reason = cpu_to_le16(reason);
 	/* Return the packet size */
 	return (2 + IEEE80211_3ADDR_LEN);
 }

 /* Create a probe request packet */
 static u32
 ieee80211softmac_probe_req(struct ieee80211_probe_request **pkt,
 	struct ieee80211softmac_device *mac, struct ieee80211softmac_essid *essid)
 {
 	u8 *data;
 	/* Allocate Packet */
 	(*pkt) = (struct ieee80211_probe_request *)ieee80211softmac_alloc_mgt(
 		/* SSID of requested network */
 		1 + 1 + IW_ESSID_MAX_SIZE +
 		/* Rates IE */
 		1 + 1 + IEEE80211SOFTMAC_MAX_RATES_LEN +
 		/* Extended Rates IE */
 		1 + 1 + IEEE80211SOFTMAC_MAX_EX_RATES_LEN
 	);
 	if (unlikely((*pkt) == NULL))
 		return 0;
 	ieee80211softmac_hdr_3addr(mac, &((*pkt)->header), IEEE80211_STYPE_PROBE_REQ, NULL, NULL);

 	data = (u8 *)(*pkt)->info_element;
 	/* Add ESSID (can be NULL) */
 	data = ieee80211softmac_add_essid(data, essid);
 	/* Add Rates */
 	data = ieee80211softmac_frame_add_rates(data, &mac->ratesinfo);
 	/* Return packet size */
 	return (data - (u8 *)(*pkt));
 }

 /* Create a probe response packet */
 /* FIXME: Not complete */
 static u32
 ieee80211softmac_probe_resp(struct ieee80211_probe_response **pkt,
 	struct ieee80211softmac_device *mac, struct ieee80211softmac_network *net)
 {
 	u8 *data;
 	/* Allocate Packet */
 	(*pkt) = (struct ieee80211_probe_response *)ieee80211softmac_alloc_mgt(
 		8 +		/* Timestamp */
 		2 +		/* Beacon Interval */
 		2 +		/* Capability Info */
 				/* SSID IE */
 		1 + 1 + IW_ESSID_MAX_SIZE +
 		7 + 		/* FH Parameter Set */
 		2 +		/* DS Parameter Set */
 		8 +		/* CF Parameter Set */
 		4 		/* IBSS Parameter Set */
 	);
 	if (unlikely((*pkt) == NULL))
 		return 0;
 	ieee80211softmac_hdr_3addr(mac, &((*pkt)->header), IEEE80211_STYPE_PROBE_RESP, net->bssid, net->bssid);
 	data = (u8 *)(*pkt)->info_element;

 	/* Return the packet size */
 	return (data - (u8 *)(*pkt));
 }


 /* Sends a manangement packet
  * FIXME: document the use of the arg parameter
  * for _AUTH: (transaction #) | (status << 16)
  */
 int
 ieee80211softmac_send_mgt_frame(struct ieee80211softmac_device *mac,
 	void *ptrarg, u32 type, u32 arg)
 {
 	void *pkt = NULL;
 	u32 pkt_size = 0;
 	int encrypt_mpdu = 0;

 	switch(type) {
 	case IEEE80211_STYPE_ASSOC_REQ:
 		pkt_size = ieee80211softmac_assoc_req((struct ieee80211_assoc_request **)(&pkt), mac, (struct ieee80211softmac_network *)ptrarg);
 		break;
 	case IEEE80211_STYPE_REASSOC_REQ:
 		pkt_size = ieee80211softmac_reassoc_req((struct ieee80211_reassoc_request **)(&pkt), mac, (struct ieee80211softmac_network *)ptrarg);
 		break;
 	case IEEE80211_STYPE_AUTH:
 		pkt_size = ieee80211softmac_auth((struct ieee80211_auth **)(&pkt), mac, (struct ieee80211softmac_network *)ptrarg, (u16)(arg & 0xFFFF), (u16) (arg >> 16), &encrypt_mpdu);
 		break;
 	case IEEE80211_STYPE_DISASSOC:
 	case IEEE80211_STYPE_DEAUTH:
 		pkt_size = ieee80211softmac_disassoc_deauth((struct ieee80211_disassoc **)(&pkt), mac, (struct ieee80211softmac_network *)ptrarg, type, (u16)(arg & 0xFFFF));
 		break;
 	case IEEE80211_STYPE_PROBE_REQ:
 		pkt_size = ieee80211softmac_probe_req((struct ieee80211_probe_request **)(&pkt), mac, (struct ieee80211softmac_essid *)ptrarg);
 		break;
 	case IEEE80211_STYPE_PROBE_RESP:
 		pkt_size = ieee80211softmac_probe_resp((struct ieee80211_probe_response **)(&pkt), mac, (struct ieee80211softmac_network *)ptrarg);
 		break;
 	default:
                 printkl(KERN_DEBUG PFX "Unsupported Management Frame type: %i\n", type);
                 return -EINVAL;
 	};

 	if(pkt_size == 0 || pkt == NULL) {
 		printkl(KERN_DEBUG PFX "Error, packet is nonexistant or 0 length\n");
 		return -ENOMEM;
 	}

 	/* Send the packet to the ieee80211 layer for tx */
 	/* we defined softmac->mgmt_xmit for this. Should we keep it
 	 * as it is (that means we'd need to wrap this into a txb),
 	 * modify the prototype (so it matches this function),
 	 * or get rid of it alltogether?
 	 * Does this work for you now?
 	 */
 	ieee80211_tx_frame(mac->ieee, (struct ieee80211_hdr *)pkt,
 		IEEE80211_3ADDR_LEN, pkt_size, encrypt_mpdu);

 	kfree(pkt);
 	return 0;
 }

 /* Beacon handling */
 int ieee80211softmac_handle_beacon(struct net_device *dev,
 	struct ieee80211_beacon *beacon,
 	struct ieee80211_network *network)
 {
 	struct ieee80211softmac_device *mac = ieee80211_priv(dev);

 	/* This might race, but we don't really care and it's not worth
 	 * adding heavyweight locking in this fastpath.
 	 */
 	if (mac->associnfo.associated) {
 		if (memcmp(network->bssid, mac->associnfo.bssid, ETH_ALEN) == 0)
 			ieee80211softmac_process_erp(mac, network->erp_value);
 	}

 	return 0;
 }
	/*
	* Some parts based on code from net80211
	* Copyright (c) 2001 Atsushi Onoe
	* Copyright (c) 2002-2005 Sam Leffler, Errno Consulting
	* All rights reserved.
	*
	* Redistribution and use in source and binary forms, with or without
	* modification, are permitted provided that the following conditions
	* are met:
	* 1. Redistributions of source code must retain the above copyright
	* notice, this list of conditions and the following disclaimer.
	* 2. Redistributions in binary form must reproduce the above copyright
	* notice, this list of conditions and the following disclaimer in the
	* documentation and/or other materials provided with the distribution.
	* 3. The name of the author may not be used to endorse or promote products
	* derived from this software without specific prior written permission.
	*
	* Alternatively, this software may be distributed under the terms of the
	* GNU General Public License ("GPL") version 2 as published by the Free
	* Software Foundation.
	*
	* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
	* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
	* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
	* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
	* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
	* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
	* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
	* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
	* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
	* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
	*
	*/

	#include "ieee80211softmac_priv.h"

	/* Helper functions for inserting data into the frames */

	/*
	* Adds an ESSID element to the frame
	*
	*/
	static u8 *
	ieee80211softmac_add_essid(u8 dst, struct ieee80211softmac_essid essid)
	{
	if (essid) {
	*dst++ = MFIE_TYPE_SSID;
	*dst++ = essid->len;
	memcpy(dst, essid->data, essid->len);
	return dst+essid->len;
	} else {
	*dst++ = MFIE_TYPE_SSID;
	*dst++ = 0;
	return dst;
	}
	}

	/* Adds Supported Rates and if required Extended Rates Information Element
	* to the frame, ASSUMES WE HAVE A SORTED LIST OF RATES */
	static u8 *
	ieee80211softmac_frame_add_rates(u8 dst, const struct ieee80211softmac_ratesinfo r)
	{
	int cck_len, ofdm_len;
	*dst++ = MFIE_TYPE_RATES;

	for(cck_len=0; ieee80211_is_cck_rate(r->rates[cck_len]) && (cck_len < r->count);cck_len++);

	if(cck_len > IEEE80211SOFTMAC_MAX_RATES_LEN)
	cck_len = IEEE80211SOFTMAC_MAX_RATES_LEN;
	*dst++ = cck_len;
	memcpy(dst, r->rates, cck_len);
	dst += cck_len;

	if(cck_len < r->count){
	for (ofdm_len=0; ieee80211_is_ofdm_rate(r->rates[ofdm_len + cck_len]) && (ofdm_len + cck_len < r->count); ofdm_len++);
	if (ofdm_len > 0) {
	if (ofdm_len > IEEE80211SOFTMAC_MAX_EX_RATES_LEN)
	ofdm_len = IEEE80211SOFTMAC_MAX_EX_RATES_LEN;
	*dst++ = MFIE_TYPE_RATES_EX;
	*dst++ = ofdm_len;
	memcpy(dst, r->rates + cck_len, ofdm_len);
	dst += ofdm_len;
	}
	}
	return dst;
	}

	/* Allocate a management frame */
	static u8 *
	ieee80211softmac_alloc_mgt(u32 size)
	{
	u8 * data;

	/* Add the header and FCS to the size */
	size = size + IEEE80211_3ADDR_LEN;
	if(size > IEEE80211_DATA_LEN)
	return NULL;
	/* Allocate the frame */
	data = kzalloc(size, GFP_ATOMIC);
	return data;
	}

	/*
	* Add a 2 Address Header
	*/
	static void
	ieee80211softmac_hdr_2addr(struct ieee80211softmac_device *mac,
	struct ieee80211_hdr_2addr header, u32 type, u8 dest)
	{
	/* Fill in the frame control flags */
	header->frame_ctl = cpu_to_le16(type);
	/* Control packets always have WEP turned off */
	if(type > IEEE80211_STYPE_CFENDACK && type < IEEE80211_STYPE_PSPOLL)
	header->frame_ctl \|= mac->ieee->sec.level ? cpu_to_le16(IEEE80211_FCTL_PROTECTED) : 0;

	/* Fill in the duration */
	header->duration_id = 0;
	/* FIXME: How do I find this?
	* calculate. But most drivers just fill in 0 (except if it's a station id of course) */

	/* Fill in the Destination Address */
	if(dest == NULL)
	memset(header->addr1, 0xFF, ETH_ALEN);
	else
	memcpy(header->addr1, dest, ETH_ALEN);
	/* Fill in the Source Address */
	memcpy(header->addr2, mac->ieee->dev->dev_addr, ETH_ALEN);

	}


	/* Add a 3 Address Header */
	static void
	ieee80211softmac_hdr_3addr(struct ieee80211softmac_device *mac,
	struct ieee80211_hdr_3addr header, u32 type, u8 dest, u8 *bssid)
	{
	/* This is common with 2addr, so use that instead */
	ieee80211softmac_hdr_2addr(mac, (struct ieee80211_hdr_2addr *)header, type, dest);

	/* Fill in the BSS ID */
	if(bssid == NULL)
	memset(header->addr3, 0xFF, ETH_ALEN);
	else
	memcpy(header->addr3, bssid, ETH_ALEN);

	/* Fill in the sequence # */
	/* FIXME: I need to add this to the softmac struct
	* shouldn't the sequence number be in ieee80211? */
	}

	static u16
	ieee80211softmac_capabilities(struct ieee80211softmac_device *mac,
	struct ieee80211softmac_network *net)
	{
	u16 capability = 0;

	/* ESS and IBSS bits are set according to the current mode */
	switch (mac->ieee->iw_mode) {
	case IW_MODE_INFRA:
	capability = cpu_to_le16(WLAN_CAPABILITY_ESS);
	break;
	case IW_MODE_ADHOC:
	capability = cpu_to_le16(WLAN_CAPABILITY_IBSS);
	break;
	case IW_MODE_AUTO:
	capability = net->capabilities &
	(WLAN_CAPABILITY_ESS\|WLAN_CAPABILITY_IBSS);
	break;
	default:
	/* bleh. we don't ever go to these modes */
	printk(KERN_ERR PFX "invalid iw_mode!\n");
	break;
	}

	/* CF Pollable / CF Poll Request */
	/* Needs to be implemented, for now, the 0's == not supported */

	/* Privacy Bit */
	capability \|= mac->ieee->sec.level ?
	cpu_to_le16(WLAN_CAPABILITY_PRIVACY) : 0;

	/* Short Preamble */
	/* Always supported: we probably won't ever be powering devices which
	* dont support this... */
	capability \|= WLAN_CAPABILITY_SHORT_PREAMBLE;

	/* PBCC */
	/* Not widely used */

	/* Channel Agility */
	/* Not widely used */

	/* Short Slot */
	/* Will be implemented later */

	/* DSSS-OFDM */
	/* Not widely used */

	return capability;
	}

	/*****************************************************************************
	* Create Management packets
	*****************************************************************************/

	/* Creates an association request packet */
	static u32
	ieee80211softmac_assoc_req(struct ieee80211_assoc_request **pkt,
	struct ieee80211softmac_device mac, struct ieee80211softmac_network net)
	{
	u8 *data;
	(pkt) = (struct ieee80211_assoc_request )ieee80211softmac_alloc_mgt(
	2 + /* Capability Info */
	2 + /* Listen Interval */
	/* SSID IE */
	1 + 1 + IW_ESSID_MAX_SIZE +
	/* Rates IE */
	1 + 1 + IEEE80211SOFTMAC_MAX_RATES_LEN +
	/* Extended Rates IE */
	1 + 1 + IEEE80211SOFTMAC_MAX_EX_RATES_LEN +
	/* WPA IE if present */
	mac->wpa.IElen
	/* Other IE's? Optional?
	* Yeah, probably need an extra IE parameter -- lots of vendors like to
	* fill in their own IEs */
	);
	if (unlikely((*pkt) == NULL))
	return 0;
	ieee80211softmac_hdr_3addr(mac, &((*pkt)->header), IEEE80211_STYPE_ASSOC_REQ, net->bssid, net->bssid);

	/* Fill in the capabilities */
	(*pkt)->capability = ieee80211softmac_capabilities(mac, net);

	/* Fill in Listen Interval (?) */
	(*pkt)->listen_interval = cpu_to_le16(10);

	data = (u8 )(pkt)->info_element;
	/* Add SSID */
	data = ieee80211softmac_add_essid(data, &net->essid);
	/* Add Rates */
	data = ieee80211softmac_frame_add_rates(data, &mac->ratesinfo);
	/* Add WPA IE */
	if (mac->wpa.IElen && mac->wpa.IE) {
	memcpy(data, mac->wpa.IE, mac->wpa.IElen);
	data += mac->wpa.IElen;
	}
	/* Return the number of used bytes */
	return (data - (u8)(pkt));
	}

	/* Create a reassociation request packet */
	static u32
	ieee80211softmac_reassoc_req(struct ieee80211_reassoc_request **pkt,
	struct ieee80211softmac_device mac, struct ieee80211softmac_network net)
	{
	u8 *data;
	(pkt) = (struct ieee80211_reassoc_request )ieee80211softmac_alloc_mgt(
	2 + /* Capability Info */
	2 + /* Listen Interval */
	ETH_ALEN + /* AP MAC */
	/* SSID IE */
	1 + 1 + IW_ESSID_MAX_SIZE +
	/* Rates IE */
	1 + 1 + IEEE80211SOFTMAC_MAX_RATES_LEN +
	/* Extended Rates IE */
	1 + 1 + IEEE80211SOFTMAC_MAX_EX_RATES_LEN
	/* Other IE's? */
	);
	if (unlikely((*pkt) == NULL))
	return 0;
	ieee80211softmac_hdr_3addr(mac, &((*pkt)->header), IEEE80211_STYPE_REASSOC_REQ, net->bssid, net->bssid);

	/* Fill in the capabilities */
	(*pkt)->capability = ieee80211softmac_capabilities(mac, net);

	/* Fill in Listen Interval (?) */
	(*pkt)->listen_interval = cpu_to_le16(10);
	/* Fill in the current AP MAC */
	memcpy((*pkt)->current_ap, mac->ieee->bssid, ETH_ALEN);

	data = (u8 )(pkt)->info_element;
	/* Add SSID */
	data = ieee80211softmac_add_essid(data, &net->essid);
	/* Add Rates */
	data = ieee80211softmac_frame_add_rates(data, &mac->ratesinfo);
	/* Return packet size */
	return (data - (u8 )(pkt));
	}

	/* Create an authentication packet */
	static u32
	ieee80211softmac_auth(struct ieee80211_auth **pkt,
	struct ieee80211softmac_device mac, struct ieee80211softmac_network net,
	u16 transaction, u16 status, int *encrypt_mpdu)
	{
	u8 *data;
	int auth_mode = mac->ieee->sec.auth_mode;
	int is_shared_response = (auth_mode == WLAN_AUTH_SHARED_KEY
	&& transaction == IEEE80211SOFTMAC_AUTH_SHARED_RESPONSE);

	/* Allocate Packet */
	(pkt) = (struct ieee80211_auth )ieee80211softmac_alloc_mgt(
	2 + /* Auth Algorithm */
	2 + /* Auth Transaction Seq */
	2 + /* Status Code */
	/* Challenge Text IE */
	(is_shared_response ? 1 + 1 + net->challenge_len : 0)
	);
	if (unlikely((*pkt) == NULL))
	return 0;
	ieee80211softmac_hdr_3addr(mac, &((*pkt)->header), IEEE80211_STYPE_AUTH, net->bssid, net->bssid);

	/* Algorithm */
	(*pkt)->algorithm = cpu_to_le16(auth_mode);
	/* Transaction */
	(*pkt)->transaction = cpu_to_le16(transaction);
	/* Status */
	(*pkt)->status = cpu_to_le16(status);

	data = (u8 )(pkt)->info_element;
	/* Challenge Text */
	if (is_shared_response) {
	*data = MFIE_TYPE_CHALLENGE;
	data++;

	/* Copy the challenge in */
	*data = net->challenge_len;
	data++;
	memcpy(data, net->challenge, net->challenge_len);
	data += net->challenge_len;

	/* Make sure this frame gets encrypted with the shared key */
	*encrypt_mpdu = 1;
	} else
	*encrypt_mpdu = 0;

	/* Return the packet size */
	return (data - (u8 )(pkt));
	}

	/* Create a disassocation or deauthentication packet */
	static u32
	ieee80211softmac_disassoc_deauth(struct ieee80211_disassoc **pkt,
	struct ieee80211softmac_device mac, struct ieee80211softmac_network net,
	u16 type, u16 reason)
	{
	/* Allocate Packet */
	(pkt) = (struct ieee80211_disassoc )ieee80211softmac_alloc_mgt(2);
	if (unlikely((*pkt) == NULL))
	return 0;
	ieee80211softmac_hdr_3addr(mac, &((*pkt)->header), type, net->bssid, net->bssid);
	/* Reason */
	(*pkt)->reason = cpu_to_le16(reason);
	/* Return the packet size */
	return (2 + IEEE80211_3ADDR_LEN);
	}

	/* Create a probe request packet */
	static u32
	ieee80211softmac_probe_req(struct ieee80211_probe_request **pkt,
	struct ieee80211softmac_device mac, struct ieee80211softmac_essid essid)
	{
	u8 *data;
	/* Allocate Packet */
	(pkt) = (struct ieee80211_probe_request )ieee80211softmac_alloc_mgt(
	/* SSID of requested network */
	1 + 1 + IW_ESSID_MAX_SIZE +
	/* Rates IE */
	1 + 1 + IEEE80211SOFTMAC_MAX_RATES_LEN +
	/* Extended Rates IE */
	1 + 1 + IEEE80211SOFTMAC_MAX_EX_RATES_LEN
	);
	if (unlikely((*pkt) == NULL))
	return 0;
	ieee80211softmac_hdr_3addr(mac, &((*pkt)->header), IEEE80211_STYPE_PROBE_REQ, NULL, NULL);

	data = (u8 )(pkt)->info_element;
	/* Add ESSID (can be NULL) */
	data = ieee80211softmac_add_essid(data, essid);
	/* Add Rates */
	data = ieee80211softmac_frame_add_rates(data, &mac->ratesinfo);
	/* Return packet size */
	return (data - (u8 )(pkt));
	}

	/* Create a probe response packet */
	/* FIXME: Not complete */
	static u32
	ieee80211softmac_probe_resp(struct ieee80211_probe_response **pkt,
	struct ieee80211softmac_device mac, struct ieee80211softmac_network net)
	{
	u8 *data;
	/* Allocate Packet */
	(pkt) = (struct ieee80211_probe_response )ieee80211softmac_alloc_mgt(
	8 + /* Timestamp */
	2 + /* Beacon Interval */
	2 + /* Capability Info */
	/* SSID IE */
	1 + 1 + IW_ESSID_MAX_SIZE +
	7 + /* FH Parameter Set */
	2 + /* DS Parameter Set */
	8 + /* CF Parameter Set */
	4 /* IBSS Parameter Set */
	);
	if (unlikely((*pkt) == NULL))
	return 0;
	ieee80211softmac_hdr_3addr(mac, &((*pkt)->header), IEEE80211_STYPE_PROBE_RESP, net->bssid, net->bssid);
	data = (u8 )(pkt)->info_element;

	/* Return the packet size */
	return (data - (u8 )(pkt));
	}


	/* Sends a manangement packet
	* FIXME: document the use of the arg parameter
	* for _AUTH: (transaction #) \| (status << 16)
	*/
	int
	ieee80211softmac_send_mgt_frame(struct ieee80211softmac_device *mac,
	void *ptrarg, u32 type, u32 arg)
	{
	void *pkt = NULL;
	u32 pkt_size = 0;
	int encrypt_mpdu = 0;

	switch(type) {
	case IEEE80211_STYPE_ASSOC_REQ:
	pkt_size = ieee80211softmac_assoc_req((struct ieee80211_assoc_request *)(&pkt), mac, (struct ieee80211softmac_network )ptrarg);
	break;
	case IEEE80211_STYPE_REASSOC_REQ:
	pkt_size = ieee80211softmac_reassoc_req((struct ieee80211_reassoc_request *)(&pkt), mac, (struct ieee80211softmac_network )ptrarg);
	break;
	case IEEE80211_STYPE_AUTH:
	pkt_size = ieee80211softmac_auth((struct ieee80211_auth *)(&pkt), mac, (struct ieee80211softmac_network )ptrarg, (u16)(arg & 0xFFFF), (u16) (arg >> 16), &encrypt_mpdu);
	break;
	case IEEE80211_STYPE_DISASSOC:
	case IEEE80211_STYPE_DEAUTH:
	pkt_size = ieee80211softmac_disassoc_deauth((struct ieee80211_disassoc *)(&pkt), mac, (struct ieee80211softmac_network )ptrarg, type, (u16)(arg & 0xFFFF));
	break;
	case IEEE80211_STYPE_PROBE_REQ:
	pkt_size = ieee80211softmac_probe_req((struct ieee80211_probe_request *)(&pkt), mac, (struct ieee80211softmac_essid )ptrarg);
	break;
	case IEEE80211_STYPE_PROBE_RESP:
	pkt_size = ieee80211softmac_probe_resp((struct ieee80211_probe_response *)(&pkt), mac, (struct ieee80211softmac_network )ptrarg);
	break;
	default:
	printkl(KERN_DEBUG PFX "Unsupported Management Frame type: %i\n", type);
	return -EINVAL;
	};

	if(pkt_size == 0 \|\| pkt == NULL) {
	printkl(KERN_DEBUG PFX "Error, packet is nonexistant or 0 length\n");
	return -ENOMEM;
	}

	/* Send the packet to the ieee80211 layer for tx */
	/* we defined softmac->mgmt_xmit for this. Should we keep it
	* as it is (that means we'd need to wrap this into a txb),
	* modify the prototype (so it matches this function),
	* or get rid of it alltogether?
	* Does this work for you now?
	*/
	ieee80211_tx_frame(mac->ieee, (struct ieee80211_hdr *)pkt,
	IEEE80211_3ADDR_LEN, pkt_size, encrypt_mpdu);

	kfree(pkt);
	return 0;
	}

	/* Beacon handling */
	int ieee80211softmac_handle_beacon(struct net_device *dev,
	struct ieee80211_beacon *beacon,
	struct ieee80211_network *network)
	{
	struct ieee80211softmac_device *mac = ieee80211_priv(dev);

	/* This might race, but we don't really care and it's not worth
	* adding heavyweight locking in this fastpath.
	*/
	if (mac->associnfo.associated) {
	if (memcmp(network->bssid, mac->associnfo.bssid, ETH_ALEN) == 0)
	ieee80211softmac_process_erp(mac, network->erp_value);
	}

	return 0;
	}