/*
* 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 __le16
ieee80211softmac_capabilities(struct ieee80211softmac_device *mac,
struct ieee80211softmac_network *net)
{
__le16 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 = cpu_to_le16(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 |= cpu_to_le16(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;
}
