475 lines
15 KiB
C
475 lines
15 KiB
C
/*
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* Some parts based on code from net80211
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* Copyright (c) 2001 Atsushi Onoe
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* Copyright (c) 2002-2005 Sam Leffler, Errno Consulting
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. The name of the author may not be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* Alternatively, this software may be distributed under the terms of the
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* GNU General Public License ("GPL") version 2 as published by the Free
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* Software Foundation.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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*/
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#include "ieee80211softmac_priv.h"
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/* Helper functions for inserting data into the frames */
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/*
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* Adds an ESSID element to the frame
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*
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*/
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static u8 *
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ieee80211softmac_add_essid(u8 *dst, struct ieee80211softmac_essid *essid)
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{
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if (essid) {
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*dst++ = MFIE_TYPE_SSID;
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*dst++ = essid->len;
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memcpy(dst, essid->data, essid->len);
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return dst+essid->len;
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} else {
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*dst++ = MFIE_TYPE_SSID;
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*dst++ = 0;
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return dst;
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}
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}
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/* Adds Supported Rates and if required Extended Rates Information Element
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* to the frame, ASSUMES WE HAVE A SORTED LIST OF RATES */
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static u8 *
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ieee80211softmac_frame_add_rates(u8 *dst, const struct ieee80211softmac_ratesinfo *r)
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{
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int cck_len, ofdm_len;
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*dst++ = MFIE_TYPE_RATES;
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for(cck_len=0; ieee80211_is_cck_rate(r->rates[cck_len]) && (cck_len < r->count);cck_len++);
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if(cck_len > IEEE80211SOFTMAC_MAX_RATES_LEN)
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cck_len = IEEE80211SOFTMAC_MAX_RATES_LEN;
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*dst++ = cck_len;
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memcpy(dst, r->rates, cck_len);
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dst += cck_len;
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if(cck_len < r->count){
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for (ofdm_len=0; ieee80211_is_ofdm_rate(r->rates[ofdm_len + cck_len]) && (ofdm_len + cck_len < r->count); ofdm_len++);
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if (ofdm_len > 0) {
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if (ofdm_len > IEEE80211SOFTMAC_MAX_EX_RATES_LEN)
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ofdm_len = IEEE80211SOFTMAC_MAX_EX_RATES_LEN;
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*dst++ = MFIE_TYPE_RATES_EX;
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*dst++ = ofdm_len;
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memcpy(dst, r->rates + cck_len, ofdm_len);
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dst += ofdm_len;
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}
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}
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return dst;
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}
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/* Allocate a management frame */
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static u8 *
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ieee80211softmac_alloc_mgt(u32 size)
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{
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u8 * data;
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/* Add the header and FCS to the size */
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size = size + IEEE80211_3ADDR_LEN;
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if(size > IEEE80211_DATA_LEN)
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return NULL;
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/* Allocate the frame */
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data = kmalloc(size, GFP_ATOMIC);
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memset(data, 0, size);
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return data;
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}
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/*
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* Add a 2 Address Header
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*/
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static void
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ieee80211softmac_hdr_2addr(struct ieee80211softmac_device *mac,
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struct ieee80211_hdr_2addr *header, u32 type, u8 *dest)
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{
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/* Fill in the frame control flags */
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header->frame_ctl = cpu_to_le16(type);
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/* Control packets always have WEP turned off */
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if(type > IEEE80211_STYPE_CFENDACK && type < IEEE80211_STYPE_PSPOLL)
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header->frame_ctl |= mac->ieee->sec.level ? cpu_to_le16(IEEE80211_FCTL_PROTECTED) : 0;
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/* Fill in the duration */
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header->duration_id = 0;
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/* FIXME: How do I find this?
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* calculate. But most drivers just fill in 0 (except if it's a station id of course) */
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/* Fill in the Destination Address */
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if(dest == NULL)
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memset(header->addr1, 0xFF, ETH_ALEN);
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else
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memcpy(header->addr1, dest, ETH_ALEN);
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/* Fill in the Source Address */
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memcpy(header->addr2, mac->ieee->dev->dev_addr, ETH_ALEN);
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}
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/* Add a 3 Address Header */
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static void
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ieee80211softmac_hdr_3addr(struct ieee80211softmac_device *mac,
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struct ieee80211_hdr_3addr *header, u32 type, u8 *dest, u8 *bssid)
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{
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/* This is common with 2addr, so use that instead */
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ieee80211softmac_hdr_2addr(mac, (struct ieee80211_hdr_2addr *)header, type, dest);
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/* Fill in the BSS ID */
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if(bssid == NULL)
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memset(header->addr3, 0xFF, ETH_ALEN);
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else
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memcpy(header->addr3, bssid, ETH_ALEN);
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/* Fill in the sequence # */
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/* FIXME: I need to add this to the softmac struct
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* shouldn't the sequence number be in ieee80211? */
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}
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/*****************************************************************************
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* Create Management packets
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*****************************************************************************/
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/* Creates an association request packet */
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static u32
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ieee80211softmac_assoc_req(struct ieee80211_assoc_request **pkt,
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struct ieee80211softmac_device *mac, struct ieee80211softmac_network *net)
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{
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u8 *data;
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(*pkt) = (struct ieee80211_assoc_request *)ieee80211softmac_alloc_mgt(
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2 + /* Capability Info */
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2 + /* Listen Interval */
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/* SSID IE */
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1 + 1 + IW_ESSID_MAX_SIZE +
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/* Rates IE */
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1 + 1 + IEEE80211SOFTMAC_MAX_RATES_LEN +
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/* Extended Rates IE */
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1 + 1 + IEEE80211SOFTMAC_MAX_EX_RATES_LEN +
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/* WPA IE if present */
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mac->wpa.IElen
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/* Other IE's? Optional?
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* Yeah, probably need an extra IE parameter -- lots of vendors like to
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* fill in their own IEs */
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);
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if (unlikely((*pkt) == NULL))
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return 0;
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ieee80211softmac_hdr_3addr(mac, &((*pkt)->header), IEEE80211_STYPE_ASSOC_REQ, net->bssid, net->bssid);
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/* Fill in capability Info */
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(*pkt)->capability = (mac->ieee->iw_mode == IW_MODE_MASTER) || (mac->ieee->iw_mode == IW_MODE_INFRA) ?
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cpu_to_le16(WLAN_CAPABILITY_ESS) :
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cpu_to_le16(WLAN_CAPABILITY_IBSS);
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/* Need to add this
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(*pkt)->capability |= mac->ieee->short_slot ?
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cpu_to_le16(WLAN_CAPABILITY_SHORT_SLOT_TIME) : 0;
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*/
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(*pkt)->capability |= mac->ieee->sec.level ? cpu_to_le16(WLAN_CAPABILITY_PRIVACY) : 0;
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/* Fill in Listen Interval (?) */
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(*pkt)->listen_interval = cpu_to_le16(10);
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data = (u8 *)(*pkt)->info_element;
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/* Add SSID */
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data = ieee80211softmac_add_essid(data, &net->essid);
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/* Add Rates */
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data = ieee80211softmac_frame_add_rates(data, &mac->ratesinfo);
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/* Add WPA IE */
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if (mac->wpa.IElen && mac->wpa.IE) {
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memcpy(data, mac->wpa.IE, mac->wpa.IElen);
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data += mac->wpa.IElen;
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}
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/* Return the number of used bytes */
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return (data - (u8*)(*pkt));
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}
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/* Create a reassociation request packet */
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static u32
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ieee80211softmac_reassoc_req(struct ieee80211_reassoc_request **pkt,
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struct ieee80211softmac_device *mac, struct ieee80211softmac_network *net)
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{
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u8 *data;
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(*pkt) = (struct ieee80211_reassoc_request *)ieee80211softmac_alloc_mgt(
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2 + /* Capability Info */
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2 + /* Listen Interval */
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ETH_ALEN + /* AP MAC */
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/* SSID IE */
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1 + 1 + IW_ESSID_MAX_SIZE +
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/* Rates IE */
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1 + 1 + IEEE80211SOFTMAC_MAX_RATES_LEN +
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/* Extended Rates IE */
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1 + 1 + IEEE80211SOFTMAC_MAX_EX_RATES_LEN
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/* Other IE's? */
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);
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if (unlikely((*pkt) == NULL))
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return 0;
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ieee80211softmac_hdr_3addr(mac, &((*pkt)->header), IEEE80211_STYPE_REASSOC_REQ, net->bssid, net->bssid);
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/* Fill in capability Info */
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(*pkt)->capability = mac->ieee->iw_mode == IW_MODE_MASTER ?
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cpu_to_le16(WLAN_CAPABILITY_ESS) :
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cpu_to_le16(WLAN_CAPABILITY_IBSS);
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/*
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(*pkt)->capability |= mac->ieee->short_slot ?
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cpu_to_le16(WLAN_CAPABILITY_SHORT_SLOT_TIME) : 0;
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*/
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(*pkt)->capability |= mac->ieee->sec.level ?
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cpu_to_le16(WLAN_CAPABILITY_PRIVACY) : 0;
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/* Fill in Listen Interval (?) */
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(*pkt)->listen_interval = cpu_to_le16(10);
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/* Fill in the current AP MAC */
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memcpy((*pkt)->current_ap, mac->ieee->bssid, ETH_ALEN);
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data = (u8 *)(*pkt)->info_element;
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/* Add SSID */
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data = ieee80211softmac_add_essid(data, &net->essid);
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/* Add Rates */
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data = ieee80211softmac_frame_add_rates(data, &mac->ratesinfo);
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/* Return packet size */
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return (data - (u8 *)(*pkt));
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}
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/* Create an authentication packet */
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static u32
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ieee80211softmac_auth(struct ieee80211_auth **pkt,
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struct ieee80211softmac_device *mac, struct ieee80211softmac_network *net,
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u16 transaction, u16 status)
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{
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u8 *data;
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/* Allocate Packet */
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(*pkt) = (struct ieee80211_auth *)ieee80211softmac_alloc_mgt(
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2 + /* Auth Algorithm */
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2 + /* Auth Transaction Seq */
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2 + /* Status Code */
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/* Challenge Text IE */
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mac->ieee->open_wep ? 0 :
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1 + 1 + WLAN_AUTH_CHALLENGE_LEN
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);
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if (unlikely((*pkt) == NULL))
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return 0;
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ieee80211softmac_hdr_3addr(mac, &((*pkt)->header), IEEE80211_STYPE_AUTH, net->bssid, net->bssid);
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/* Algorithm */
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(*pkt)->algorithm = mac->ieee->open_wep ?
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cpu_to_le16(WLAN_AUTH_OPEN) :
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cpu_to_le16(WLAN_AUTH_SHARED_KEY);
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/* Transaction */
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(*pkt)->transaction = cpu_to_le16(transaction);
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/* Status */
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(*pkt)->status = cpu_to_le16(status);
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data = (u8 *)(*pkt)->info_element;
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/* Challenge Text */
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if(!mac->ieee->open_wep){
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*data = MFIE_TYPE_CHALLENGE;
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data++;
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/* Copy the challenge in */
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// *data = challenge length
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// data += sizeof(u16);
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// memcpy(data, challenge, challenge length);
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// data += challenge length;
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/* Add the full size to the packet length */
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}
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/* Return the packet size */
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return (data - (u8 *)(*pkt));
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}
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/* Create a disassocation or deauthentication packet */
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static u32
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ieee80211softmac_disassoc_deauth(struct ieee80211_disassoc **pkt,
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struct ieee80211softmac_device *mac, struct ieee80211softmac_network *net,
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u16 type, u16 reason)
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{
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/* Allocate Packet */
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(*pkt) = (struct ieee80211_disassoc *)ieee80211softmac_alloc_mgt(2);
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if (unlikely(pkt == NULL))
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return 0;
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ieee80211softmac_hdr_3addr(mac, &((*pkt)->header), type, net->bssid, net->bssid);
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/* Reason */
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(*pkt)->reason = cpu_to_le16(reason);
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/* Return the packet size */
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return (2 + IEEE80211_3ADDR_LEN);
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}
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/* Create a probe request packet */
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static u32
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ieee80211softmac_probe_req(struct ieee80211_probe_request **pkt,
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struct ieee80211softmac_device *mac, struct ieee80211softmac_essid *essid)
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{
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u8 *data;
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/* Allocate Packet */
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(*pkt) = (struct ieee80211_probe_request *)ieee80211softmac_alloc_mgt(
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/* SSID of requested network */
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1 + 1 + IW_ESSID_MAX_SIZE +
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/* Rates IE */
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1 + 1 + IEEE80211SOFTMAC_MAX_RATES_LEN +
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/* Extended Rates IE */
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1 + 1 + IEEE80211SOFTMAC_MAX_EX_RATES_LEN
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);
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if (unlikely((*pkt) == NULL))
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return 0;
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ieee80211softmac_hdr_3addr(mac, &((*pkt)->header), IEEE80211_STYPE_PROBE_REQ, NULL, NULL);
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data = (u8 *)(*pkt)->info_element;
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/* Add ESSID (can be NULL) */
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data = ieee80211softmac_add_essid(data, essid);
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/* Add Rates */
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data = ieee80211softmac_frame_add_rates(data, &mac->ratesinfo);
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/* Return packet size */
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return (data - (u8 *)(*pkt));
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}
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/* Create a probe response packet */
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/* FIXME: Not complete */
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static u32
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ieee80211softmac_probe_resp(struct ieee80211_probe_response **pkt,
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struct ieee80211softmac_device *mac, struct ieee80211softmac_network *net)
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{
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u8 *data;
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/* Allocate Packet */
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(*pkt) = (struct ieee80211_probe_response *)ieee80211softmac_alloc_mgt(
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8 + /* Timestamp */
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2 + /* Beacon Interval */
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2 + /* Capability Info */
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/* SSID IE */
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1 + 1 + IW_ESSID_MAX_SIZE +
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7 + /* FH Parameter Set */
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2 + /* DS Parameter Set */
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8 + /* CF Parameter Set */
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4 /* IBSS Parameter Set */
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);
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if (unlikely((*pkt) == NULL))
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return 0;
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ieee80211softmac_hdr_3addr(mac, &((*pkt)->header), IEEE80211_STYPE_PROBE_RESP, net->bssid, net->bssid);
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data = (u8 *)(*pkt)->info_element;
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/* Return the packet size */
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return (data - (u8 *)(*pkt));
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}
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/* Sends a manangement packet
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* FIXME: document the use of the arg parameter
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* for _AUTH: (transaction #) | (status << 16)
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*/
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int
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ieee80211softmac_send_mgt_frame(struct ieee80211softmac_device *mac,
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void *ptrarg, u32 type, u32 arg)
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{
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void *pkt = NULL;
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u32 pkt_size = 0;
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switch(type) {
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case IEEE80211_STYPE_ASSOC_REQ:
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pkt_size = ieee80211softmac_assoc_req((struct ieee80211_assoc_request **)(&pkt), mac, (struct ieee80211softmac_network *)ptrarg);
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break;
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case IEEE80211_STYPE_REASSOC_REQ:
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pkt_size = ieee80211softmac_reassoc_req((struct ieee80211_reassoc_request **)(&pkt), mac, (struct ieee80211softmac_network *)ptrarg);
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break;
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case IEEE80211_STYPE_AUTH:
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pkt_size = ieee80211softmac_auth((struct ieee80211_auth **)(&pkt), mac, (struct ieee80211softmac_network *)ptrarg, (u16)(arg & 0xFFFF), (u16) (arg >> 16));
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break;
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case IEEE80211_STYPE_DISASSOC:
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case IEEE80211_STYPE_DEAUTH:
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pkt_size = ieee80211softmac_disassoc_deauth((struct ieee80211_disassoc **)(&pkt), mac, (struct ieee80211softmac_network *)ptrarg, type, (u16)(arg & 0xFFFF));
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break;
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case IEEE80211_STYPE_PROBE_REQ:
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pkt_size = ieee80211softmac_probe_req((struct ieee80211_probe_request **)(&pkt), mac, (struct ieee80211softmac_essid *)ptrarg);
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break;
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case IEEE80211_STYPE_PROBE_RESP:
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pkt_size = ieee80211softmac_probe_resp((struct ieee80211_probe_response **)(&pkt), mac, (struct ieee80211softmac_network *)ptrarg);
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break;
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default:
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printkl(KERN_DEBUG PFX "Unsupported Management Frame type: %i\n", type);
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return -EINVAL;
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};
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if(pkt_size == 0 || pkt == NULL) {
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printkl(KERN_DEBUG PFX "Error, packet is nonexistant or 0 length\n");
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return -ENOMEM;
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}
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/* Send the packet to the ieee80211 layer for tx */
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/* we defined softmac->mgmt_xmit for this. Should we keep it
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* as it is (that means we'd need to wrap this into a txb),
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* modify the prototype (so it matches this function),
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* or get rid of it alltogether?
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* Does this work for you now?
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*/
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ieee80211_tx_frame(mac->ieee, (struct ieee80211_hdr *)pkt, pkt_size);
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kfree(pkt);
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return 0;
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}
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/* Create an rts/cts frame */
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static u32
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ieee80211softmac_rts_cts(struct ieee80211_hdr_2addr **pkt,
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struct ieee80211softmac_device *mac, struct ieee80211softmac_network *net,
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u32 type)
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{
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/* Allocate Packet */
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(*pkt) = kmalloc(IEEE80211_2ADDR_LEN, GFP_ATOMIC);
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memset(*pkt, 0, IEEE80211_2ADDR_LEN);
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if((*pkt) == NULL)
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return 0;
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ieee80211softmac_hdr_2addr(mac, (*pkt), type, net->bssid);
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return IEEE80211_2ADDR_LEN;
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}
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/* Sends a control packet */
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static int
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ieee80211softmac_send_ctl_frame(struct ieee80211softmac_device *mac,
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struct ieee80211softmac_network *net, u32 type, u32 arg)
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{
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void *pkt = NULL;
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u32 pkt_size = 0;
|
|
|
|
switch(type) {
|
|
case IEEE80211_STYPE_RTS:
|
|
case IEEE80211_STYPE_CTS:
|
|
pkt_size = ieee80211softmac_rts_cts((struct ieee80211_hdr_2addr **)(&pkt), mac, net, type);
|
|
break;
|
|
default:
|
|
printkl(KERN_DEBUG PFX "Unsupported Control Frame type: %i\n", type);
|
|
return -EINVAL;
|
|
}
|
|
|
|
if(pkt_size == 0)
|
|
return -ENOMEM;
|
|
|
|
/* Send the packet to the ieee80211 layer for tx */
|
|
ieee80211_tx_frame(mac->ieee, (struct ieee80211_hdr *) pkt, pkt_size);
|
|
|
|
kfree(pkt);
|
|
return 0;
|
|
}
|