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ieee80211_sta.c
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/*
* BSS client mode implementation
* Copyright 2003, Jouni Malinen <[email protected]>
* Copyright 2004, Instant802 Networks, Inc.
* Copyright 2005, Devicescape Software, Inc.
* Copyright 2006-2007 Jiri Benc <[email protected]>
* Copyright 2007, Michael Wu <[email protected]>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*/
/* TODO:
* BSS table: use <BSSID,SSID> as the key to support multi-SSID APs
* order BSS list by RSSI(?) ("quality of AP")
* scan result table filtering (by capability (privacy, IBSS/BSS, WPA/RSN IE,
* SSID)
*/
#include <linux/if_ether.h>
#include <linux/skbuff.h>
#include <linux/netdevice.h>
#include <linux/if_arp.h>
#include <linux/wireless.h>
#include <linux/random.h>
#include <linux/etherdevice.h>
#include <linux/rtnetlink.h>
#include <net/iw_handler.h>
#include <asm/types.h>
#include <asm/delay.h>
#include <net/mac80211.h>
#include "ieee80211_i.h"
#include "ieee80211_rate.h"
#include "hostapd_ioctl.h"
#define IEEE80211_AUTH_TIMEOUT (HZ / 5)
#define IEEE80211_AUTH_MAX_TRIES 3
#define IEEE80211_ASSOC_TIMEOUT (HZ / 5)
#define IEEE80211_ASSOC_MAX_TRIES 3
#define IEEE80211_MONITORING_INTERVAL (2 * HZ)
#define IEEE80211_PROBE_INTERVAL (60 * HZ)
#define IEEE80211_RETRY_AUTH_INTERVAL (1 * HZ)
#define IEEE80211_SCAN_INTERVAL (2 * HZ)
#define IEEE80211_SCAN_INTERVAL_SLOW (15 * HZ)
#define IEEE80211_IBSS_JOIN_TIMEOUT (20 * HZ)
#define IEEE80211_PROBE_DELAY (HZ / 33)
#define IEEE80211_CHANNEL_TIME (HZ / 33)
#define IEEE80211_PASSIVE_CHANNEL_TIME (HZ / 5)
#define IEEE80211_SCAN_RESULT_EXPIRE (10 * HZ)
#define IEEE80211_IBSS_MERGE_INTERVAL (30 * HZ)
#define IEEE80211_IBSS_INACTIVITY_LIMIT (60 * HZ)
#define IEEE80211_IBSS_MAX_STA_ENTRIES 128
#define IEEE80211_FC(type, stype) cpu_to_le16(type | stype)
#define ERP_INFO_USE_PROTECTION BIT(1)
static void ieee80211_send_probe_req(struct net_device *dev, u8 *dst,
u8 *ssid, size_t ssid_len);
static struct ieee80211_sta_bss *
ieee80211_rx_bss_get(struct net_device *dev, u8 *bssid);
static void ieee80211_rx_bss_put(struct net_device *dev,
struct ieee80211_sta_bss *bss);
static int ieee80211_sta_find_ibss(struct net_device *dev,
struct ieee80211_if_sta *ifsta);
static int ieee80211_sta_wep_configured(struct net_device *dev);
static int ieee80211_sta_start_scan(struct net_device *dev,
u8 *ssid, size_t ssid_len);
static int ieee80211_sta_config_auth(struct net_device *dev,
struct ieee80211_if_sta *ifsta);
/* Parsed Information Elements */
struct ieee802_11_elems {
u8 *ssid;
u8 ssid_len;
u8 *supp_rates;
u8 supp_rates_len;
u8 *fh_params;
u8 fh_params_len;
u8 *ds_params;
u8 ds_params_len;
u8 *cf_params;
u8 cf_params_len;
u8 *tim;
u8 tim_len;
u8 *ibss_params;
u8 ibss_params_len;
u8 *challenge;
u8 challenge_len;
u8 *wpa;
u8 wpa_len;
u8 *rsn;
u8 rsn_len;
u8 *erp_info;
u8 erp_info_len;
u8 *ext_supp_rates;
u8 ext_supp_rates_len;
u8 *wmm_info;
u8 wmm_info_len;
u8 *wmm_param;
u8 wmm_param_len;
};
typedef enum { ParseOK = 0, ParseUnknown = 1, ParseFailed = -1 } ParseRes;
static ParseRes ieee802_11_parse_elems(u8 *start, size_t len,
struct ieee802_11_elems *elems)
{
size_t left = len;
u8 *pos = start;
int unknown = 0;
memset(elems, 0, sizeof(*elems));
while (left >= 2) {
u8 id, elen;
id = *pos++;
elen = *pos++;
left -= 2;
if (elen > left) {
#if 0
if (net_ratelimit())
printk(KERN_DEBUG "IEEE 802.11 element parse "
"failed (id=%d elen=%d left=%d)\n",
id, elen, left);
#endif
return ParseFailed;
}
switch (id) {
case WLAN_EID_SSID:
elems->ssid = pos;
elems->ssid_len = elen;
break;
case WLAN_EID_SUPP_RATES:
elems->supp_rates = pos;
elems->supp_rates_len = elen;
break;
case WLAN_EID_FH_PARAMS:
elems->fh_params = pos;
elems->fh_params_len = elen;
break;
case WLAN_EID_DS_PARAMS:
elems->ds_params = pos;
elems->ds_params_len = elen;
break;
case WLAN_EID_CF_PARAMS:
elems->cf_params = pos;
elems->cf_params_len = elen;
break;
case WLAN_EID_TIM:
elems->tim = pos;
elems->tim_len = elen;
break;
case WLAN_EID_IBSS_PARAMS:
elems->ibss_params = pos;
elems->ibss_params_len = elen;
break;
case WLAN_EID_CHALLENGE:
elems->challenge = pos;
elems->challenge_len = elen;
break;
case WLAN_EID_WPA:
if (elen >= 4 && pos[0] == 0x00 && pos[1] == 0x50 &&
pos[2] == 0xf2) {
/* Microsoft OUI (00:50:F2) */
if (pos[3] == 1) {
/* OUI Type 1 - WPA IE */
elems->wpa = pos;
elems->wpa_len = elen;
} else if (elen >= 5 && pos[3] == 2) {
if (pos[4] == 0) {
elems->wmm_info = pos;
elems->wmm_info_len = elen;
} else if (pos[4] == 1) {
elems->wmm_param = pos;
elems->wmm_param_len = elen;
}
}
}
break;
case WLAN_EID_RSN:
elems->rsn = pos;
elems->rsn_len = elen;
break;
case WLAN_EID_ERP_INFO:
elems->erp_info = pos;
elems->erp_info_len = elen;
break;
case WLAN_EID_EXT_SUPP_RATES:
elems->ext_supp_rates = pos;
elems->ext_supp_rates_len = elen;
break;
default:
#if 0
printk(KERN_DEBUG "IEEE 802.11 element parse ignored "
"unknown element (id=%d elen=%d)\n",
id, elen);
#endif
unknown++;
break;
}
left -= elen;
pos += elen;
}
/* Do not trigger error if left == 1 as Apple Airport base stations
* send AssocResps that are one spurious byte too long. */
return unknown ? ParseUnknown : ParseOK;
}
static int ecw2cw(int ecw)
{
int cw = 1;
while (ecw > 0) {
cw <<= 1;
ecw--;
}
return cw - 1;
}
static void ieee80211_sta_wmm_params(struct net_device *dev,
struct ieee80211_if_sta *ifsta,
u8 *wmm_param, size_t wmm_param_len)
{
struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
struct ieee80211_tx_queue_params params;
size_t left;
int count;
u8 *pos;
if (wmm_param_len < 8 || wmm_param[5] /* version */ != 1)
return;
count = wmm_param[6] & 0x0f;
if (count == ifsta->wmm_last_param_set)
return;
ifsta->wmm_last_param_set = count;
pos = wmm_param + 8;
left = wmm_param_len - 8;
memset(¶ms, 0, sizeof(params));
if (!local->ops->conf_tx)
return;
local->wmm_acm = 0;
for (; left >= 4; left -= 4, pos += 4) {
int aci = (pos[0] >> 5) & 0x03;
int acm = (pos[0] >> 4) & 0x01;
int queue;
switch (aci) {
case 1:
queue = IEEE80211_TX_QUEUE_DATA3;
if (acm) {
local->wmm_acm |= BIT(0) | BIT(3);
}
break;
case 2:
queue = IEEE80211_TX_QUEUE_DATA1;
if (acm) {
local->wmm_acm |= BIT(4) | BIT(5);
}
break;
case 3:
queue = IEEE80211_TX_QUEUE_DATA0;
if (acm) {
local->wmm_acm |= BIT(6) | BIT(7);
}
break;
case 0:
default:
queue = IEEE80211_TX_QUEUE_DATA2;
if (acm) {
local->wmm_acm |= BIT(1) | BIT(2);
}
break;
}
params.aifs = pos[0] & 0x0f;
params.cw_max = ecw2cw((pos[1] & 0xf0) >> 4);
params.cw_min = ecw2cw(pos[1] & 0x0f);
/* TXOP is in units of 32 usec; burst_time in 0.1 ms */
params.burst_time = (pos[2] | (pos[3] << 8)) * 32 / 100;
printk(KERN_DEBUG "%s: WMM queue=%d aci=%d acm=%d aifs=%d "
"cWmin=%d cWmax=%d burst=%d\n",
dev->name, queue, aci, acm, params.aifs, params.cw_min,
params.cw_max, params.burst_time);
/* TODO: handle ACM (block TX, fallback to next lowest allowed
* AC for now) */
if (local->ops->conf_tx(local_to_hw(local), queue, ¶ms)) {
printk(KERN_DEBUG "%s: failed to set TX queue "
"parameters for queue %d\n", dev->name, queue);
}
}
}
static void ieee80211_sta_send_associnfo(struct net_device *dev,
struct ieee80211_if_sta *ifsta)
{
char *buf;
size_t len;
int i;
union iwreq_data wrqu;
if (!ifsta->assocreq_ies && !ifsta->assocresp_ies)
return;
buf = kmalloc(50 + 2 * (ifsta->assocreq_ies_len +
ifsta->assocresp_ies_len), GFP_ATOMIC);
if (!buf)
return;
len = sprintf(buf, "ASSOCINFO(");
if (ifsta->assocreq_ies) {
len += sprintf(buf + len, "ReqIEs=");
for (i = 0; i < ifsta->assocreq_ies_len; i++) {
len += sprintf(buf + len, "%02x",
ifsta->assocreq_ies[i]);
}
}
if (ifsta->assocresp_ies) {
if (ifsta->assocreq_ies)
len += sprintf(buf + len, " ");
len += sprintf(buf + len, "RespIEs=");
for (i = 0; i < ifsta->assocresp_ies_len; i++) {
len += sprintf(buf + len, "%02x",
ifsta->assocresp_ies[i]);
}
}
len += sprintf(buf + len, ")");
if (len > IW_CUSTOM_MAX) {
len = sprintf(buf, "ASSOCRESPIE=");
for (i = 0; i < ifsta->assocresp_ies_len; i++) {
len += sprintf(buf + len, "%02x",
ifsta->assocresp_ies[i]);
}
}
memset(&wrqu, 0, sizeof(wrqu));
wrqu.data.length = len;
wireless_send_event(dev, IWEVCUSTOM, &wrqu, buf);
kfree(buf);
}
static void ieee80211_set_associated(struct net_device *dev,
struct ieee80211_if_sta *ifsta, int assoc)
{
union iwreq_data wrqu;
if (ifsta->associated == assoc)
return;
ifsta->associated = assoc;
if (assoc) {
struct ieee80211_sub_if_data *sdata;
sdata = IEEE80211_DEV_TO_SUB_IF(dev);
if (sdata->type != IEEE80211_IF_TYPE_STA)
return;
netif_carrier_on(dev);
ifsta->prev_bssid_set = 1;
memcpy(ifsta->prev_bssid, sdata->u.sta.bssid, ETH_ALEN);
memcpy(wrqu.ap_addr.sa_data, sdata->u.sta.bssid, ETH_ALEN);
ieee80211_sta_send_associnfo(dev, ifsta);
} else {
netif_carrier_off(dev);
memset(wrqu.ap_addr.sa_data, 0, ETH_ALEN);
}
wrqu.ap_addr.sa_family = ARPHRD_ETHER;
wireless_send_event(dev, SIOCGIWAP, &wrqu, NULL);
ifsta->last_probe = jiffies;
}
static void ieee80211_set_disassoc(struct net_device *dev,
struct ieee80211_if_sta *ifsta, int deauth)
{
if (deauth)
ifsta->auth_tries = 0;
ifsta->assoc_tries = 0;
ieee80211_set_associated(dev, ifsta, 0);
}
static void ieee80211_sta_tx(struct net_device *dev, struct sk_buff *skb,
int encrypt)
{
struct ieee80211_sub_if_data *sdata;
struct ieee80211_tx_packet_data *pkt_data;
sdata = IEEE80211_DEV_TO_SUB_IF(dev);
skb->dev = sdata->local->mdev;
skb_set_mac_header(skb, 0);
skb_set_network_header(skb, 0);
skb_set_transport_header(skb, 0);
pkt_data = (struct ieee80211_tx_packet_data *) skb->cb;
memset(pkt_data, 0, sizeof(struct ieee80211_tx_packet_data));
pkt_data->ifindex = sdata->dev->ifindex;
pkt_data->mgmt_iface = (sdata->type == IEEE80211_IF_TYPE_MGMT);
pkt_data->do_not_encrypt = !encrypt;
dev_queue_xmit(skb);
}
static void ieee80211_send_auth(struct net_device *dev,
struct ieee80211_if_sta *ifsta,
int transaction, u8 *extra, size_t extra_len,
int encrypt)
{
struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
struct sk_buff *skb;
struct ieee80211_mgmt *mgmt;
skb = dev_alloc_skb(local->hw.extra_tx_headroom +
sizeof(*mgmt) + 6 + extra_len);
if (!skb) {
printk(KERN_DEBUG "%s: failed to allocate buffer for auth "
"frame\n", dev->name);
return;
}
skb_reserve(skb, local->hw.extra_tx_headroom);
mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24 + 6);
memset(mgmt, 0, 24 + 6);
mgmt->frame_control = IEEE80211_FC(IEEE80211_FTYPE_MGMT,
IEEE80211_STYPE_AUTH);
if (encrypt)
mgmt->frame_control |= cpu_to_le16(IEEE80211_FCTL_PROTECTED);
memcpy(mgmt->da, ifsta->bssid, ETH_ALEN);
memcpy(mgmt->sa, dev->dev_addr, ETH_ALEN);
memcpy(mgmt->bssid, ifsta->bssid, ETH_ALEN);
mgmt->u.auth.auth_alg = cpu_to_le16(ifsta->auth_alg);
mgmt->u.auth.auth_transaction = cpu_to_le16(transaction);
ifsta->auth_transaction = transaction + 1;
mgmt->u.auth.status_code = cpu_to_le16(0);
if (extra)
memcpy(skb_put(skb, extra_len), extra, extra_len);
ieee80211_sta_tx(dev, skb, encrypt);
}
static void ieee80211_authenticate(struct net_device *dev,
struct ieee80211_if_sta *ifsta)
{
ifsta->auth_tries++;
if (ifsta->auth_tries > IEEE80211_AUTH_MAX_TRIES) {
printk(KERN_DEBUG "%s: authentication with AP " MAC_FMT
" timed out\n",
dev->name, MAC_ARG(ifsta->bssid));
ifsta->state = IEEE80211_DISABLED;
return;
}
ifsta->state = IEEE80211_AUTHENTICATE;
printk(KERN_DEBUG "%s: authenticate with AP " MAC_FMT "\n",
dev->name, MAC_ARG(ifsta->bssid));
ieee80211_send_auth(dev, ifsta, 1, NULL, 0, 0);
mod_timer(&ifsta->timer, jiffies + IEEE80211_AUTH_TIMEOUT);
}
static void ieee80211_send_assoc(struct net_device *dev,
struct ieee80211_if_sta *ifsta)
{
struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
struct ieee80211_hw_mode *mode;
struct sk_buff *skb;
struct ieee80211_mgmt *mgmt;
u8 *pos, *ies;
int i, len;
u16 capab;
struct ieee80211_sta_bss *bss;
int wmm = 0;
skb = dev_alloc_skb(local->hw.extra_tx_headroom +
sizeof(*mgmt) + 200 + ifsta->extra_ie_len +
ifsta->ssid_len);
if (!skb) {
printk(KERN_DEBUG "%s: failed to allocate buffer for assoc "
"frame\n", dev->name);
return;
}
skb_reserve(skb, local->hw.extra_tx_headroom);
mode = local->oper_hw_mode;
capab = ifsta->capab;
if (mode->mode == MODE_IEEE80211G) {
capab |= WLAN_CAPABILITY_SHORT_SLOT_TIME |
WLAN_CAPABILITY_SHORT_PREAMBLE;
}
bss = ieee80211_rx_bss_get(dev, ifsta->bssid);
if (bss) {
if (bss->capability & WLAN_CAPABILITY_PRIVACY)
capab |= WLAN_CAPABILITY_PRIVACY;
if (bss->wmm_ie) {
wmm = 1;
}
ieee80211_rx_bss_put(dev, bss);
}
mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
memset(mgmt, 0, 24);
memcpy(mgmt->da, ifsta->bssid, ETH_ALEN);
memcpy(mgmt->sa, dev->dev_addr, ETH_ALEN);
memcpy(mgmt->bssid, ifsta->bssid, ETH_ALEN);
if (ifsta->prev_bssid_set) {
skb_put(skb, 10);
mgmt->frame_control = IEEE80211_FC(IEEE80211_FTYPE_MGMT,
IEEE80211_STYPE_REASSOC_REQ);
mgmt->u.reassoc_req.capab_info = cpu_to_le16(capab);
mgmt->u.reassoc_req.listen_interval = cpu_to_le16(1);
memcpy(mgmt->u.reassoc_req.current_ap, ifsta->prev_bssid,
ETH_ALEN);
} else {
skb_put(skb, 4);
mgmt->frame_control = IEEE80211_FC(IEEE80211_FTYPE_MGMT,
IEEE80211_STYPE_ASSOC_REQ);
mgmt->u.assoc_req.capab_info = cpu_to_le16(capab);
mgmt->u.assoc_req.listen_interval = cpu_to_le16(1);
}
/* SSID */
ies = pos = skb_put(skb, 2 + ifsta->ssid_len);
*pos++ = WLAN_EID_SSID;
*pos++ = ifsta->ssid_len;
memcpy(pos, ifsta->ssid, ifsta->ssid_len);
len = mode->num_rates;
if (len > 8)
len = 8;
pos = skb_put(skb, len + 2);
*pos++ = WLAN_EID_SUPP_RATES;
*pos++ = len;
for (i = 0; i < len; i++) {
int rate = mode->rates[i].rate;
if (mode->mode == MODE_ATHEROS_TURBO)
rate /= 2;
*pos++ = (u8) (rate / 5);
}
if (mode->num_rates > len) {
pos = skb_put(skb, mode->num_rates - len + 2);
*pos++ = WLAN_EID_EXT_SUPP_RATES;
*pos++ = mode->num_rates - len;
for (i = len; i < mode->num_rates; i++) {
int rate = mode->rates[i].rate;
if (mode->mode == MODE_ATHEROS_TURBO)
rate /= 2;
*pos++ = (u8) (rate / 5);
}
}
if (ifsta->extra_ie) {
pos = skb_put(skb, ifsta->extra_ie_len);
memcpy(pos, ifsta->extra_ie, ifsta->extra_ie_len);
}
if (wmm && ifsta->wmm_enabled) {
pos = skb_put(skb, 9);
*pos++ = WLAN_EID_VENDOR_SPECIFIC;
*pos++ = 7; /* len */
*pos++ = 0x00; /* Microsoft OUI 00:50:F2 */
*pos++ = 0x50;
*pos++ = 0xf2;
*pos++ = 2; /* WME */
*pos++ = 0; /* WME info */
*pos++ = 1; /* WME ver */
*pos++ = 0;
}
kfree(ifsta->assocreq_ies);
ifsta->assocreq_ies_len = (skb->data + skb->len) - ies;
ifsta->assocreq_ies = kmalloc(ifsta->assocreq_ies_len, GFP_ATOMIC);
if (ifsta->assocreq_ies)
memcpy(ifsta->assocreq_ies, ies, ifsta->assocreq_ies_len);
ieee80211_sta_tx(dev, skb, 0);
}
static void ieee80211_send_deauth(struct net_device *dev,
struct ieee80211_if_sta *ifsta, u16 reason)
{
struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
struct sk_buff *skb;
struct ieee80211_mgmt *mgmt;
skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*mgmt));
if (!skb) {
printk(KERN_DEBUG "%s: failed to allocate buffer for deauth "
"frame\n", dev->name);
return;
}
skb_reserve(skb, local->hw.extra_tx_headroom);
mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
memset(mgmt, 0, 24);
memcpy(mgmt->da, ifsta->bssid, ETH_ALEN);
memcpy(mgmt->sa, dev->dev_addr, ETH_ALEN);
memcpy(mgmt->bssid, ifsta->bssid, ETH_ALEN);
mgmt->frame_control = IEEE80211_FC(IEEE80211_FTYPE_MGMT,
IEEE80211_STYPE_DEAUTH);
skb_put(skb, 2);
mgmt->u.deauth.reason_code = cpu_to_le16(reason);
ieee80211_sta_tx(dev, skb, 0);
}
static void ieee80211_send_disassoc(struct net_device *dev,
struct ieee80211_if_sta *ifsta, u16 reason)
{
struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
struct sk_buff *skb;
struct ieee80211_mgmt *mgmt;
skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*mgmt));
if (!skb) {
printk(KERN_DEBUG "%s: failed to allocate buffer for disassoc "
"frame\n", dev->name);
return;
}
skb_reserve(skb, local->hw.extra_tx_headroom);
mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
memset(mgmt, 0, 24);
memcpy(mgmt->da, ifsta->bssid, ETH_ALEN);
memcpy(mgmt->sa, dev->dev_addr, ETH_ALEN);
memcpy(mgmt->bssid, ifsta->bssid, ETH_ALEN);
mgmt->frame_control = IEEE80211_FC(IEEE80211_FTYPE_MGMT,
IEEE80211_STYPE_DISASSOC);
skb_put(skb, 2);
mgmt->u.disassoc.reason_code = cpu_to_le16(reason);
ieee80211_sta_tx(dev, skb, 0);
}
static int ieee80211_privacy_mismatch(struct net_device *dev,
struct ieee80211_if_sta *ifsta)
{
struct ieee80211_sta_bss *bss;
int res = 0;
if (!ifsta || ifsta->mixed_cell ||
ifsta->key_mgmt != IEEE80211_KEY_MGMT_NONE)
return 0;
bss = ieee80211_rx_bss_get(dev, ifsta->bssid);
if (!bss)
return 0;
if (ieee80211_sta_wep_configured(dev) !=
!!(bss->capability & WLAN_CAPABILITY_PRIVACY))
res = 1;
ieee80211_rx_bss_put(dev, bss);
return res;
}
static void ieee80211_associate(struct net_device *dev,
struct ieee80211_if_sta *ifsta)
{
ifsta->assoc_tries++;
if (ifsta->assoc_tries > IEEE80211_ASSOC_MAX_TRIES) {
printk(KERN_DEBUG "%s: association with AP " MAC_FMT
" timed out\n",
dev->name, MAC_ARG(ifsta->bssid));
ifsta->state = IEEE80211_DISABLED;
return;
}
ifsta->state = IEEE80211_ASSOCIATE;
printk(KERN_DEBUG "%s: associate with AP " MAC_FMT "\n",
dev->name, MAC_ARG(ifsta->bssid));
if (ieee80211_privacy_mismatch(dev, ifsta)) {
printk(KERN_DEBUG "%s: mismatch in privacy configuration and "
"mixed-cell disabled - abort association\n", dev->name);
ifsta->state = IEEE80211_DISABLED;
return;
}
ieee80211_send_assoc(dev, ifsta);
mod_timer(&ifsta->timer, jiffies + IEEE80211_ASSOC_TIMEOUT);
}
static void ieee80211_associated(struct net_device *dev,
struct ieee80211_if_sta *ifsta)
{
struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
struct sta_info *sta;
int disassoc;
/* TODO: start monitoring current AP signal quality and number of
* missed beacons. Scan other channels every now and then and search
* for better APs. */
/* TODO: remove expired BSSes */
ifsta->state = IEEE80211_ASSOCIATED;
sta = sta_info_get(local, ifsta->bssid);
if (!sta) {
printk(KERN_DEBUG "%s: No STA entry for own AP " MAC_FMT "\n",
dev->name, MAC_ARG(ifsta->bssid));
disassoc = 1;
} else {
disassoc = 0;
if (time_after(jiffies,
sta->last_rx + IEEE80211_MONITORING_INTERVAL)) {
if (ifsta->probereq_poll) {
printk(KERN_DEBUG "%s: No ProbeResp from "
"current AP " MAC_FMT " - assume out of "
"range\n",
dev->name, MAC_ARG(ifsta->bssid));
disassoc = 1;
sta_info_free(sta, 0);
ifsta->probereq_poll = 0;
} else {
ieee80211_send_probe_req(dev, ifsta->bssid,
local->scan_ssid,
local->scan_ssid_len);
ifsta->probereq_poll = 1;
}
} else {
ifsta->probereq_poll = 0;
if (time_after(jiffies, ifsta->last_probe +
IEEE80211_PROBE_INTERVAL)) {
ifsta->last_probe = jiffies;
ieee80211_send_probe_req(dev, ifsta->bssid,
ifsta->ssid,
ifsta->ssid_len);
}
}
sta_info_put(sta);
}
if (disassoc) {
union iwreq_data wrqu;
memset(wrqu.ap_addr.sa_data, 0, ETH_ALEN);
wrqu.ap_addr.sa_family = ARPHRD_ETHER;
wireless_send_event(dev, SIOCGIWAP, &wrqu, NULL);
mod_timer(&ifsta->timer, jiffies +
IEEE80211_MONITORING_INTERVAL + 30 * HZ);
} else {
mod_timer(&ifsta->timer, jiffies +
IEEE80211_MONITORING_INTERVAL);
}
}
static void ieee80211_send_probe_req(struct net_device *dev, u8 *dst,
u8 *ssid, size_t ssid_len)
{
struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
struct ieee80211_hw_mode *mode;
struct sk_buff *skb;
struct ieee80211_mgmt *mgmt;
u8 *pos, *supp_rates, *esupp_rates = NULL;
int i;
skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*mgmt) + 200);
if (!skb) {
printk(KERN_DEBUG "%s: failed to allocate buffer for probe "
"request\n", dev->name);
return;
}
skb_reserve(skb, local->hw.extra_tx_headroom);
mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
memset(mgmt, 0, 24);
mgmt->frame_control = IEEE80211_FC(IEEE80211_FTYPE_MGMT,
IEEE80211_STYPE_PROBE_REQ);
memcpy(mgmt->sa, dev->dev_addr, ETH_ALEN);
if (dst) {
memcpy(mgmt->da, dst, ETH_ALEN);
memcpy(mgmt->bssid, dst, ETH_ALEN);
} else {
memset(mgmt->da, 0xff, ETH_ALEN);
memset(mgmt->bssid, 0xff, ETH_ALEN);
}
pos = skb_put(skb, 2 + ssid_len);
*pos++ = WLAN_EID_SSID;
*pos++ = ssid_len;
memcpy(pos, ssid, ssid_len);
supp_rates = skb_put(skb, 2);
supp_rates[0] = WLAN_EID_SUPP_RATES;
supp_rates[1] = 0;
mode = local->oper_hw_mode;
for (i = 0; i < mode->num_rates; i++) {
struct ieee80211_rate *rate = &mode->rates[i];
if (!(rate->flags & IEEE80211_RATE_SUPPORTED))
continue;
if (esupp_rates) {
pos = skb_put(skb, 1);
esupp_rates[1]++;
} else if (supp_rates[1] == 8) {
esupp_rates = skb_put(skb, 3);
esupp_rates[0] = WLAN_EID_EXT_SUPP_RATES;
esupp_rates[1] = 1;
pos = &esupp_rates[2];
} else {
pos = skb_put(skb, 1);
supp_rates[1]++;
}
if (mode->mode == MODE_ATHEROS_TURBO)
*pos = rate->rate / 10;
else
*pos = rate->rate / 5;
}
ieee80211_sta_tx(dev, skb, 0);
}
static int ieee80211_sta_wep_configured(struct net_device *dev)
{
struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
if (!sdata || !sdata->default_key ||
sdata->default_key->alg != ALG_WEP)
return 0;
return 1;
}
static void ieee80211_auth_completed(struct net_device *dev,
struct ieee80211_if_sta *ifsta)
{
printk(KERN_DEBUG "%s: authenticated\n", dev->name);
ifsta->authenticated = 1;
ieee80211_associate(dev, ifsta);
}
static void ieee80211_auth_challenge(struct net_device *dev,
struct ieee80211_if_sta *ifsta,
struct ieee80211_mgmt *mgmt,
size_t len)
{
u8 *pos;
struct ieee802_11_elems elems;
printk(KERN_DEBUG "%s: replying to auth challenge\n", dev->name);
pos = mgmt->u.auth.variable;
if (ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), &elems)
== ParseFailed) {
printk(KERN_DEBUG "%s: failed to parse Auth(challenge)\n",
dev->name);
return;
}
if (!elems.challenge) {
printk(KERN_DEBUG "%s: no challenge IE in shared key auth "
"frame\n", dev->name);
return;
}
ieee80211_send_auth(dev, ifsta, 3, elems.challenge - 2,
elems.challenge_len + 2, 1);
}
static void ieee80211_rx_mgmt_auth(struct net_device *dev,
struct ieee80211_if_sta *ifsta,
struct ieee80211_mgmt *mgmt,
size_t len)
{
struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
u16 auth_alg, auth_transaction, status_code;
if (ifsta->state != IEEE80211_AUTHENTICATE &&
sdata->type != IEEE80211_IF_TYPE_IBSS) {
printk(KERN_DEBUG "%s: authentication frame received from "
MAC_FMT ", but not in authenticate state - ignored\n",
dev->name, MAC_ARG(mgmt->sa));
return;
}
if (len < 24 + 6) {
printk(KERN_DEBUG "%s: too short (%zd) authentication frame "
"received from " MAC_FMT " - ignored\n",
dev->name, len, MAC_ARG(mgmt->sa));
return;
}
if (sdata->type != IEEE80211_IF_TYPE_IBSS &&
memcmp(ifsta->bssid, mgmt->sa, ETH_ALEN) != 0) {
printk(KERN_DEBUG "%s: authentication frame received from "
"unknown AP (SA=" MAC_FMT " BSSID=" MAC_FMT ") - "
"ignored\n", dev->name, MAC_ARG(mgmt->sa),
MAC_ARG(mgmt->bssid));
return;
}
if (sdata->type != IEEE80211_IF_TYPE_IBSS &&
memcmp(ifsta->bssid, mgmt->bssid, ETH_ALEN) != 0) {
printk(KERN_DEBUG "%s: authentication frame received from "
"unknown BSSID (SA=" MAC_FMT " BSSID=" MAC_FMT ") - "
"ignored\n", dev->name, MAC_ARG(mgmt->sa),
MAC_ARG(mgmt->bssid));
return;
}
auth_alg = le16_to_cpu(mgmt->u.auth.auth_alg);
auth_transaction = le16_to_cpu(mgmt->u.auth.auth_transaction);
status_code = le16_to_cpu(mgmt->u.auth.status_code);
printk(KERN_DEBUG "%s: RX authentication from " MAC_FMT " (alg=%d "
"transaction=%d status=%d)\n",
dev->name, MAC_ARG(mgmt->sa), auth_alg,
auth_transaction, status_code);
if (sdata->type == IEEE80211_IF_TYPE_IBSS) {
/* IEEE 802.11 standard does not require authentication in IBSS
* networks and most implementations do not seem to use it.
* However, try to reply to authentication attempts if someone
* has actually implemented this.
* TODO: Could implement shared key authentication. */
if (auth_alg != WLAN_AUTH_OPEN || auth_transaction != 1) {
printk(KERN_DEBUG "%s: unexpected IBSS authentication "
"frame (alg=%d transaction=%d)\n",
dev->name, auth_alg, auth_transaction);
return;
}
ieee80211_send_auth(dev, ifsta, 2, NULL, 0, 0);
}
if (auth_alg != ifsta->auth_alg ||
auth_transaction != ifsta->auth_transaction) {
printk(KERN_DEBUG "%s: unexpected authentication frame "
"(alg=%d transaction=%d)\n",
dev->name, auth_alg, auth_transaction);
return;
}
if (status_code != WLAN_STATUS_SUCCESS) {
printk(KERN_DEBUG "%s: AP denied authentication (auth_alg=%d "
"code=%d)\n", dev->name, ifsta->auth_alg, status_code);
if (status_code == WLAN_STATUS_NOT_SUPPORTED_AUTH_ALG) {
u8 algs[3];
const int num_algs = ARRAY_SIZE(algs);
int i, pos;
algs[0] = algs[1] = algs[2] = 0xff;
if (ifsta->auth_algs & IEEE80211_AUTH_ALG_OPEN)
algs[0] = WLAN_AUTH_OPEN;
if (ifsta->auth_algs & IEEE80211_AUTH_ALG_SHARED_KEY)
algs[1] = WLAN_AUTH_SHARED_KEY;
if (ifsta->auth_algs & IEEE80211_AUTH_ALG_LEAP)
algs[2] = WLAN_AUTH_LEAP;
if (ifsta->auth_alg == WLAN_AUTH_OPEN)
pos = 0;
else if (ifsta->auth_alg == WLAN_AUTH_SHARED_KEY)
pos = 1;
else
pos = 2;
for (i = 0; i < num_algs; i++) {
pos++;
if (pos >= num_algs)
pos = 0;
if (algs[pos] == ifsta->auth_alg ||
algs[pos] == 0xff)
continue;
if (algs[pos] == WLAN_AUTH_SHARED_KEY &&
!ieee80211_sta_wep_configured(dev))
continue;
ifsta->auth_alg = algs[pos];
printk(KERN_DEBUG "%s: set auth_alg=%d for "
"next try\n",
dev->name, ifsta->auth_alg);
break;
}
}
return;
}