iv/linux
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity
f23513e8d9
linux/net/mac80211/ieee80211_sta.c
Daniel Drake 63fc33ceb0 [PATCH] mac80211: improved 802.11g CTS protection 
Currently, CTS protection is partially implemented twice:
 1. via prism2 ioctls, only used by hostapd
 2. via STA beacon parsing, recorded in sta.use_protection but never used
    (other than printed in debugfs)

Protection control should be implemented on a per-subif basis. For example,
a single physical device may be running a soft AP on one channel, and a STA
on another. The AP interface should use protection based on what hostapd told
it, and the STA interface should use protection based on beacon parsing.
These should operate independantly: one subif using protection should not
influence the other.

To implement this, I moved the use_protection flag into ieee80211_sub_if_data
and removed the device-global cts_protect_erp_frames flag.

I also made the PRISM2_PARAM_CTS_PROTECT_ERP_FRAMES write operation only
available for AP interfaces, to avoid any possibility of the user messing with
the behaviour of a STA.

Signed-off-by: Daniel Drake <dsd@gentoo.org>
Signed-off-by: Jiri Benc <jbenc@suse.cz>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
2007-07-12 16:07:26 -04:00

3109 lines
84 KiB
C
Raw Blame History

/*
* BSS client mode implementation
* Copyright 2003, Jouni Malinen <jkmaline@cc.hut.fi>
* Copyright 2004, Instant802 Networks, Inc.
* Copyright 2005, Devicescape Software, Inc.
* Copyright 2006-2007 Jiri Benc <jbenc@suse.cz>
* Copyright 2007, Michael Wu <flamingice@sourmilk.net>
*
* 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/delay.h>
#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 <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 {
/* pointers to IEs */
u8 *ssid;
u8 *supp_rates;
u8 *fh_params;
u8 *ds_params;
u8 *cf_params;
u8 *tim;
u8 *ibss_params;
u8 *challenge;
u8 *wpa;
u8 *rsn;
u8 *erp_info;
u8 *ext_supp_rates;
u8 *wmm_info;
u8 *wmm_param;
/* length of them, respectively */
u8 ssid_len;
u8 supp_rates_len;
u8 fh_params_len;
u8 ds_params_len;
u8 cf_params_len;
u8 tim_len;
u8 ibss_params_len;
u8 challenge_len;
u8 wpa_len;
u8 rsn_len;
u8 erp_info_len;
u8 ext_supp_rates_len;
u8 wmm_info_len;
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(&params, 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, &params)) {
printk(KERN_DEBUG "%s: failed to set TX queue "
"parameters for queue %d\n", dev->name, queue);
}
}
}
static void ieee80211_handle_erp_ie(struct net_device *dev, u8 erp_value)
{
struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
struct ieee80211_if_sta *ifsta = &sdata->u.sta;
int use_protection = (erp_value & WLAN_ERP_USE_PROTECTION) != 0;
if (use_protection != sdata->use_protection) {
if (net_ratelimit()) {
printk(KERN_DEBUG "%s: CTS protection %s (BSSID="
MAC_FMT ")\n",
dev->name,
use_protection ? "enabled" : "disabled",
MAC_ARG(ifsta->bssid));
}
sdata->use_protection = use_protection;
}
}
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;
struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
if (ifsta->associated == assoc)
return;
ifsta->associated = assoc;
if (assoc) {
struct ieee80211_sub_if_data *sdata;
struct ieee80211_sta_bss *bss;
sdata = IEEE80211_DEV_TO_SUB_IF(dev);
if (sdata->type != IEEE80211_IF_TYPE_STA)
return;
bss = ieee80211_rx_bss_get(dev, ifsta->bssid);
if (bss) {
if (bss->has_erp_value)
ieee80211_handle_erp_ie(dev, bss->erp_value);
ieee80211_rx_bss_put(dev, bss);
}
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);
sdata->use_protection = 0;
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;
}
switch (ifsta->auth_alg) {
case WLAN_AUTH_OPEN:
case WLAN_AUTH_LEAP:
ieee80211_auth_completed(dev, ifsta);
break;
case WLAN_AUTH_SHARED_KEY:
if (ifsta->auth_transaction == 4)
ieee80211_auth_completed(dev, ifsta);
else
ieee80211_auth_challenge(dev, ifsta, mgmt, len);
break;
}
}
static void ieee80211_rx_mgmt_deauth(struct net_device *dev,
struct ieee80211_if_sta *ifsta,
struct ieee80211_mgmt *mgmt,
size_t len)
{
u16 reason_code;
if (len < 24 + 2) {
printk(KERN_DEBUG "%s: too short (%zd) deauthentication frame "
"received from " MAC_FMT " - ignored\n",
dev->name, len, MAC_ARG(mgmt->sa));
return;
}
if (memcmp(ifsta->bssid, mgmt->sa, ETH_ALEN) != 0) {
printk(KERN_DEBUG "%s: deauthentication frame received from "
"unknown AP (SA=" MAC_FMT " BSSID=" MAC_FMT ") - "
"ignored\n", dev->name, MAC_ARG(mgmt->sa),
MAC_ARG(mgmt->bssid));
return;
}
reason_code = le16_to_cpu(mgmt->u.deauth.reason_code);
printk(KERN_DEBUG "%s: RX deauthentication from " MAC_FMT
" (reason=%d)\n",
dev->name, MAC_ARG(mgmt->sa), reason_code);
if (ifsta->authenticated) {
printk(KERN_DEBUG "%s: deauthenticated\n", dev->name);
}
if (ifsta->state == IEEE80211_AUTHENTICATE ||
ifsta->state == IEEE80211_ASSOCIATE ||
ifsta->state == IEEE80211_ASSOCIATED) {
ifsta->state = IEEE80211_AUTHENTICATE;
mod_timer(&ifsta->timer, jiffies +
IEEE80211_RETRY_AUTH_INTERVAL);
}
ieee80211_set_disassoc(dev, ifsta, 1);
ifsta->authenticated = 0;
}
static void ieee80211_rx_mgmt_disassoc(struct net_device *dev,
struct ieee80211_if_sta *ifsta,
struct ieee80211_mgmt *mgmt,
size_t len)
{
u16 reason_code;
if (len < 24 + 2) {
printk(KERN_DEBUG "%s: too short (%zd) disassociation frame "
"received from " MAC_FMT " - ignored\n",
dev->name, len, MAC_ARG(mgmt->sa));
return;
}
if (memcmp(ifsta->bssid, mgmt->sa, ETH_ALEN) != 0) {
printk(KERN_DEBUG "%s: disassociation frame received from "
"unknown AP (SA=" MAC_FMT " BSSID=" MAC_FMT ") - "
"ignored\n", dev->name, MAC_ARG(mgmt->sa),
MAC_ARG(mgmt->bssid));
return;
}
reason_code = le16_to_cpu(mgmt->u.disassoc.reason_code);
printk(KERN_DEBUG "%s: RX disassociation from " MAC_FMT
" (reason=%d)\n",
dev->name, MAC_ARG(mgmt->sa), reason_code);
if (ifsta->associated)
printk(KERN_DEBUG "%s: disassociated\n", dev->name);
if (ifsta->state == IEEE80211_ASSOCIATED) {
ifsta->state = IEEE80211_ASSOCIATE;
mod_timer(&ifsta->timer, jiffies +
IEEE80211_RETRY_AUTH_INTERVAL);
}
ieee80211_set_disassoc(dev, ifsta, 0);
}
static void ieee80211_rx_mgmt_assoc_resp(struct net_device *dev,
struct ieee80211_if_sta *ifsta,
struct ieee80211_mgmt *mgmt,
size_t len,
int reassoc)
{
struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
struct ieee80211_hw_mode *mode;
struct sta_info *sta;
u32 rates;
u16 capab_info, status_code, aid;
struct ieee802_11_elems elems;
u8 *pos;
int i, j;
/* AssocResp and ReassocResp have identical structure, so process both
* of them in this function. */
if (ifsta->state != IEEE80211_ASSOCIATE) {
printk(KERN_DEBUG "%s: association frame received from "
MAC_FMT ", but not in associate state - ignored\n",
dev->name, MAC_ARG(mgmt->sa));
return;
}
if (len < 24 + 6) {
printk(KERN_DEBUG "%s: too short (%zd) association frame "
"received from " MAC_FMT " - ignored\n",
dev->name, len, MAC_ARG(mgmt->sa));
return;
}
if (memcmp(ifsta->bssid, mgmt->sa, ETH_ALEN) != 0) {
printk(KERN_DEBUG "%s: association frame received from "
"unknown AP (SA=" MAC_FMT " BSSID=" MAC_FMT ") - "
"ignored\n", dev->name, MAC_ARG(mgmt->sa),
MAC_ARG(mgmt->bssid));
return;
}
capab_info = le16_to_cpu(mgmt->u.assoc_resp.capab_info);
status_code = le16_to_cpu(mgmt->u.assoc_resp.status_code);
aid = le16_to_cpu(mgmt->u.assoc_resp.aid);
if ((aid & (BIT(15) | BIT(14))) != (BIT(15) | BIT(14)))
printk(KERN_DEBUG "%s: invalid aid value %d; bits 15:14 not "
"set\n", dev->name, aid);
aid &= ~(BIT(15) | BIT(14));
printk(KERN_DEBUG "%s: RX %sssocResp from " MAC_FMT " (capab=0x%x "
"status=%d aid=%d)\n",
dev->name, reassoc ? "Rea" : "A", MAC_ARG(mgmt->sa),
capab_info, status_code, aid);
if (status_code != WLAN_STATUS_SUCCESS) {
printk(KERN_DEBUG "%s: AP denied association (code=%d)\n",
dev->name, status_code);
if (status_code == WLAN_STATUS_REASSOC_NO_ASSOC)
ifsta->prev_bssid_set = 0;
return;
}
pos = mgmt->u.assoc_resp.variable;
if (ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), &elems)
== ParseFailed) {
printk(KERN_DEBUG "%s: failed to parse AssocResp\n",
dev->name);
return;
}
if (!elems.supp_rates) {
printk(KERN_DEBUG "%s: no SuppRates element in AssocResp\n",
dev->name);
return;
}
/* it probably doesn't, but if the frame includes an ERP value then
* update our stored copy */
if (elems.erp_info && elems.erp_info_len >= 1) {
struct ieee80211_sta_bss *bss
= ieee80211_rx_bss_get(dev, ifsta->bssid);
if (bss) {
bss->erp_value = elems.erp_info[0];
bss->has_erp_value = 1;
ieee80211_rx_bss_put(dev, bss);
}
}
printk(KERN_DEBUG "%s: associated\n", dev->name);
ifsta->aid = aid;
ifsta->ap_capab = capab_info;
kfree(ifsta->assocresp_ies);
ifsta->assocresp_ies_len = len - (pos - (u8 *) mgmt);
ifsta->assocresp_ies = kmalloc(ifsta->assocresp_ies_len, GFP_ATOMIC);
if (ifsta->assocresp_ies)
memcpy(ifsta->assocresp_ies, pos, ifsta->assocresp_ies_len);
ieee80211_set_associated(dev, ifsta, 1);
/* Add STA entry for the AP */
sta = sta_info_get(local, ifsta->bssid);
if (!sta) {
struct ieee80211_sta_bss *bss;
sta = sta_info_add(local, dev, ifsta->bssid, GFP_ATOMIC);
if (!sta) {
printk(KERN_DEBUG "%s: failed to add STA entry for the"
" AP\n", dev->name);
return;
}
bss = ieee80211_rx_bss_get(dev, ifsta->bssid);
if (bss) {
sta->last_rssi = bss->rssi;
sta->last_signal = bss->signal;
sta->last_noise = bss->noise;
ieee80211_rx_bss_put(dev, bss);
}
}
sta->dev = dev;
sta->flags |= WLAN_STA_AUTH | WLAN_STA_ASSOC;
sta->assoc_ap = 1;
rates = 0;
mode = local->oper_hw_mode;
for (i = 0; i < elems.supp_rates_len; i++) {
int rate = (elems.supp_rates[i] & 0x7f) * 5;
if (mode->mode == MODE_ATHEROS_TURBO)
rate *= 2;
for (j = 0; j < mode->num_rates; j++)
if (mode->rates[j].rate == rate)
rates |= BIT(j);
}
for (i = 0; i < elems.ext_supp_rates_len; i++) {
int rate = (elems.ext_supp_rates[i] & 0x7f) * 5;
if (mode->mode == MODE_ATHEROS_TURBO)
rate *= 2;
for (j = 0; j < mode->num_rates; j++)
if (mode->rates[j].rate == rate)
rates |= BIT(j);
}
sta->supp_rates = rates;
rate_control_rate_init(sta, local);
if (elems.wmm_param && ifsta->wmm_enabled) {
sta->flags |= WLAN_STA_WME;
ieee80211_sta_wmm_params(dev, ifsta, elems.wmm_param,
elems.wmm_param_len);
}
sta_info_put(sta);
ieee80211_associated(dev, ifsta);
}
/* Caller must hold local->sta_bss_lock */
static void __ieee80211_rx_bss_hash_add(struct net_device *dev,
struct ieee80211_sta_bss *bss)
{
struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
bss->hnext = local->sta_bss_hash[STA_HASH(bss->bssid)];
local->sta_bss_hash[STA_HASH(bss->bssid)] = bss;
}
/* Caller must hold local->sta_bss_lock */
static void __ieee80211_rx_bss_hash_del(struct net_device *dev,
struct ieee80211_sta_bss *bss)
{
struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
struct ieee80211_sta_bss *b, *prev = NULL;
b = local->sta_bss_hash[STA_HASH(bss->bssid)];
while (b) {
if (b == bss) {
if (!prev)
local->sta_bss_hash[STA_HASH(bss->bssid)] =
bss->hnext;
else
prev->hnext = bss->hnext;
break;
}
prev = b;
b = b->hnext;
}
}
static struct ieee80211_sta_bss *
ieee80211_rx_bss_add(struct net_device *dev, u8 *bssid)
{
struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
struct ieee80211_sta_bss *bss;
bss = kmalloc(sizeof(*bss), GFP_ATOMIC);
if (!bss)
return NULL;
memset(bss, 0, sizeof(*bss));
atomic_inc(&bss->users);
atomic_inc(&bss->users);
memcpy(bss->bssid, bssid, ETH_ALEN);
spin_lock_bh(&local->sta_bss_lock);
/* TODO: order by RSSI? */
list_add_tail(&bss->list, &local->sta_bss_list);
__ieee80211_rx_bss_hash_add(dev, bss);
spin_unlock_bh(&local->sta_bss_lock);
return bss;
}
static struct ieee80211_sta_bss *
ieee80211_rx_bss_get(struct net_device *dev, u8 *bssid)
{
struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
struct ieee80211_sta_bss *bss;
spin_lock_bh(&local->sta_bss_lock);
bss = local->sta_bss_hash[STA_HASH(bssid)];
while (bss) {
if (memcmp(bss->bssid, bssid, ETH_ALEN) == 0) {
atomic_inc(&bss->users);
break;
}
bss = bss->hnext;
}
spin_unlock_bh(&local->sta_bss_lock);
return bss;
}
static void ieee80211_rx_bss_free(struct ieee80211_sta_bss *bss)
{
kfree(bss->wpa_ie);
kfree(bss->rsn_ie);
kfree(bss->wmm_ie);
kfree(bss);
}
static void ieee80211_rx_bss_put(struct net_device *dev,
struct ieee80211_sta_bss *bss)
{
struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
if (!atomic_dec_and_test(&bss->users))
return;
spin_lock_bh(&local->sta_bss_lock);
__ieee80211_rx_bss_hash_del(dev, bss);
list_del(&bss->list);
spin_unlock_bh(&local->sta_bss_lock);
ieee80211_rx_bss_free(bss);
}
void ieee80211_rx_bss_list_init(struct net_device *dev)
{
struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
spin_lock_init(&local->sta_bss_lock);
INIT_LIST_HEAD(&local->sta_bss_list);
}
void ieee80211_rx_bss_list_deinit(struct net_device *dev)
{
struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
struct ieee80211_sta_bss *bss, *tmp;
list_for_each_entry_safe(bss, tmp, &local->sta_bss_list, list)
ieee80211_rx_bss_put(dev, bss);
}
static void ieee80211_rx_bss_info(struct net_device *dev,
struct ieee80211_mgmt *mgmt,
size_t len,
struct ieee80211_rx_status *rx_status,
int beacon)
{
struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
struct ieee802_11_elems elems;
size_t baselen;
int channel, invalid = 0, clen;
struct ieee80211_sta_bss *bss;
struct sta_info *sta;
struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
u64 timestamp;
if (!beacon && memcmp(mgmt->da, dev->dev_addr, ETH_ALEN))
return; /* ignore ProbeResp to foreign address */
#if 0
printk(KERN_DEBUG "%s: RX %s from " MAC_FMT " to " MAC_FMT "\n",
dev->name, beacon ? "Beacon" : "Probe Response",
MAC_ARG(mgmt->sa), MAC_ARG(mgmt->da));
#endif
baselen = (u8 *) mgmt->u.beacon.variable - (u8 *) mgmt;
if (baselen > len)
return;
timestamp = le64_to_cpu(mgmt->u.beacon.timestamp);
if (sdata->type == IEEE80211_IF_TYPE_IBSS && beacon &&
memcmp(mgmt->bssid, sdata->u.sta.bssid, ETH_ALEN) == 0) {
#ifdef CONFIG_MAC80211_IBSS_DEBUG
static unsigned long last_tsf_debug = 0;
u64 tsf;
if (local->ops->get_tsf)
tsf = local->ops->get_tsf(local_to_hw(local));
else
tsf = -1LLU;
if (time_after(jiffies, last_tsf_debug + 5 * HZ)) {
printk(KERN_DEBUG "RX beacon SA=" MAC_FMT " BSSID="
MAC_FMT " TSF=0x%llx BCN=0x%llx diff=%lld "
"@%lu\n",
MAC_ARG(mgmt->sa), MAC_ARG(mgmt->bssid),
(unsigned long long)tsf,
(unsigned long long)timestamp,
(unsigned long long)(tsf - timestamp),
jiffies);
last_tsf_debug = jiffies;
}
#endif /* CONFIG_MAC80211_IBSS_DEBUG */
}
if (ieee802_11_parse_elems(mgmt->u.beacon.variable, len - baselen,
&elems) == ParseFailed)
invalid = 1;
if (sdata->type == IEEE80211_IF_TYPE_IBSS && elems.supp_rates &&
memcmp(mgmt->bssid, sdata->u.sta.bssid, ETH_ALEN) == 0 &&
(sta = sta_info_get(local, mgmt->sa))) {
struct ieee80211_hw_mode *mode;
struct ieee80211_rate *rates;
size_t num_rates;
u32 supp_rates, prev_rates;
int i, j;
mode = local->sta_scanning ?
local->scan_hw_mode : local->oper_hw_mode;
rates = mode->rates;
num_rates = mode->num_rates;
supp_rates = 0;
for (i = 0; i < elems.supp_rates_len +
elems.ext_supp_rates_len; i++) {
u8 rate = 0;
int own_rate;
if (i < elems.supp_rates_len)
rate = elems.supp_rates[i];
else if (elems.ext_supp_rates)
rate = elems.ext_supp_rates
[i - elems.supp_rates_len];
own_rate = 5 * (rate & 0x7f);
if (mode->mode == MODE_ATHEROS_TURBO)
own_rate *= 2;
for (j = 0; j < num_rates; j++)
if (rates[j].rate == own_rate)
supp_rates |= BIT(j);
}
prev_rates = sta->supp_rates;
sta->supp_rates &= supp_rates;
if (sta->supp_rates == 0) {
/* No matching rates - this should not really happen.
* Make sure that at least one rate is marked
* supported to avoid issues with TX rate ctrl. */
sta->supp_rates = sdata->u.sta.supp_rates_bits;
}
if (sta->supp_rates != prev_rates) {
printk(KERN_DEBUG "%s: updated supp_rates set for "
MAC_FMT " based on beacon info (0x%x & 0x%x -> "
"0x%x)\n",
dev->name, MAC_ARG(sta->addr), prev_rates,
supp_rates, sta->supp_rates);
}
sta_info_put(sta);
}
if (!elems.ssid)
return;
if (elems.ds_params && elems.ds_params_len == 1)
channel = elems.ds_params[0];
else
channel = rx_status->channel;
bss = ieee80211_rx_bss_get(dev, mgmt->bssid);
if (!bss) {
bss = ieee80211_rx_bss_add(dev, mgmt->bssid);
if (!bss)
return;
} else {
#if 0
/* TODO: order by RSSI? */
spin_lock_bh(&local->sta_bss_lock);
list_move_tail(&bss->list, &local->sta_bss_list);
spin_unlock_bh(&local->sta_bss_lock);
#endif
}
if (bss->probe_resp && beacon) {
/* Do not allow beacon to override data from Probe Response. */
ieee80211_rx_bss_put(dev, bss);
return;
}
/* save the ERP value so that it is available at association time */
if (elems.erp_info && elems.erp_info_len >= 1) {
bss->erp_value = elems.erp_info[0];
bss->has_erp_value = 1;
}
bss->beacon_int = le16_to_cpu(mgmt->u.beacon.beacon_int);
bss->capability = le16_to_cpu(mgmt->u.beacon.capab_info);
if (elems.ssid && elems.ssid_len <= IEEE80211_MAX_SSID_LEN) {
memcpy(bss->ssid, elems.ssid, elems.ssid_len);
bss->ssid_len = elems.ssid_len;
}
bss->supp_rates_len = 0;
if (elems.supp_rates) {
clen = IEEE80211_MAX_SUPP_RATES - bss->supp_rates_len;
if (clen > elems.supp_rates_len)
clen = elems.supp_rates_len;
memcpy(&bss->supp_rates[bss->supp_rates_len], elems.supp_rates,
clen);
bss->supp_rates_len += clen;
}
if (elems.ext_supp_rates) {
clen = IEEE80211_MAX_SUPP_RATES - bss->supp_rates_len;
if (clen > elems.ext_supp_rates_len)
clen = elems.ext_supp_rates_len;
memcpy(&bss->supp_rates[bss->supp_rates_len],
elems.ext_supp_rates, clen);
bss->supp_rates_len += clen;
}
if (elems.wpa &&
(!bss->wpa_ie || bss->wpa_ie_len != elems.wpa_len ||
memcmp(bss->wpa_ie, elems.wpa, elems.wpa_len))) {
kfree(bss->wpa_ie);
bss->wpa_ie = kmalloc(elems.wpa_len + 2, GFP_ATOMIC);
if (bss->wpa_ie) {
memcpy(bss->wpa_ie, elems.wpa - 2, elems.wpa_len + 2);
bss->wpa_ie_len = elems.wpa_len + 2;
} else
bss->wpa_ie_len = 0;
} else if (!elems.wpa && bss->wpa_ie) {
kfree(bss->wpa_ie);
bss->wpa_ie = NULL;
bss->wpa_ie_len = 0;
}
if (elems.rsn &&
(!bss->rsn_ie || bss->rsn_ie_len != elems.rsn_len ||
memcmp(bss->rsn_ie, elems.rsn, elems.rsn_len))) {
kfree(bss->rsn_ie);
bss->rsn_ie = kmalloc(elems.rsn_len + 2, GFP_ATOMIC);
if (bss->rsn_ie) {
memcpy(bss->rsn_ie, elems.rsn - 2, elems.rsn_len + 2);
bss->rsn_ie_len = elems.rsn_len + 2;
} else
bss->rsn_ie_len = 0;
} else if (!elems.rsn && bss->rsn_ie) {
kfree(bss->rsn_ie);
bss->rsn_ie = NULL;
bss->rsn_ie_len = 0;
}
if (elems.wmm_param &&
(!bss->wmm_ie || bss->wmm_ie_len != elems.wmm_param_len ||
memcmp(bss->wmm_ie, elems.wmm_param, elems.wmm_param_len))) {
kfree(bss->wmm_ie);
bss->wmm_ie = kmalloc(elems.wmm_param_len + 2, GFP_ATOMIC);
if (bss->wmm_ie) {
memcpy(bss->wmm_ie, elems.wmm_param - 2,
elems.wmm_param_len + 2);
bss->wmm_ie_len = elems.wmm_param_len + 2;
} else
bss->wmm_ie_len = 0;
} else if (!elems.wmm_param && bss->wmm_ie) {
kfree(bss->wmm_ie);
bss->wmm_ie = NULL;
bss->wmm_ie_len = 0;
}
bss->hw_mode = rx_status->phymode;
bss->channel = channel;
bss->freq = rx_status->freq;
if (channel != rx_status->channel &&
(bss->hw_mode == MODE_IEEE80211G ||
bss->hw_mode == MODE_IEEE80211B) &&
channel >= 1 && channel <= 14) {
static const int freq_list[] = {
2412, 2417, 2422, 2427, 2432, 2437, 2442,
2447, 2452, 2457, 2462, 2467, 2472, 2484
};
/* IEEE 802.11g/b mode can receive packets from neighboring
* channels, so map the channel into frequency. */
bss->freq = freq_list[channel - 1];
}
bss->timestamp = timestamp;
bss->last_update = jiffies;
bss->rssi = rx_status->ssi;
bss->signal = rx_status->signal;
bss->noise = rx_status->noise;
if (!beacon)
bss->probe_resp++;
ieee80211_rx_bss_put(dev, bss);
}
static void ieee80211_rx_mgmt_probe_resp(struct net_device *dev,
struct ieee80211_mgmt *mgmt,
size_t len,
struct ieee80211_rx_status *rx_status)
{
ieee80211_rx_bss_info(dev, mgmt, len, rx_status, 0);
}
static void ieee80211_rx_mgmt_beacon(struct net_device *dev,
struct ieee80211_mgmt *mgmt,
size_t len,
struct ieee80211_rx_status *rx_status)
{
struct ieee80211_sub_if_data *sdata;
struct ieee80211_if_sta *ifsta;
size_t baselen;
struct ieee802_11_elems elems;
ieee80211_rx_bss_info(dev, mgmt, len, rx_status, 1);
sdata = IEEE80211_DEV_TO_SUB_IF(dev);
if (sdata->type != IEEE80211_IF_TYPE_STA)
return;
ifsta = &sdata->u.sta;
if (!ifsta->associated ||
memcmp(ifsta->bssid, mgmt->bssid, ETH_ALEN) != 0)
return;
/* Process beacon from the current BSS */
baselen = (u8 *) mgmt->u.beacon.variable - (u8 *) mgmt;
if (baselen > len)
return;
if (ieee802_11_parse_elems(mgmt->u.beacon.variable, len - baselen,
&elems) == ParseFailed)
return;
if (elems.erp_info && elems.erp_info_len >= 1)
ieee80211_handle_erp_ie(dev, elems.erp_info[0]);
if (elems.wmm_param && ifsta->wmm_enabled) {
ieee80211_sta_wmm_params(dev, ifsta, elems.wmm_param,
elems.wmm_param_len);
}
}
static void ieee80211_rx_mgmt_probe_req(struct net_device *dev,
struct ieee80211_if_sta *ifsta,
struct ieee80211_mgmt *mgmt,
size_t len,
struct ieee80211_rx_status *rx_status)
{
struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
int tx_last_beacon;
struct sk_buff *skb;
struct ieee80211_mgmt *resp;
u8 *pos, *end;
if (sdata->type != IEEE80211_IF_TYPE_IBSS ||
ifsta->state != IEEE80211_IBSS_JOINED ||
len < 24 + 2 || !ifsta->probe_resp)
return;
if (local->ops->tx_last_beacon)
tx_last_beacon = local->ops->tx_last_beacon(local_to_hw(local));
else
tx_last_beacon = 1;
#ifdef CONFIG_MAC80211_IBSS_DEBUG
printk(KERN_DEBUG "%s: RX ProbeReq SA=" MAC_FMT " DA=" MAC_FMT " BSSID="
MAC_FMT " (tx_last_beacon=%d)\n",
dev->name, MAC_ARG(mgmt->sa), MAC_ARG(mgmt->da),
MAC_ARG(mgmt->bssid), tx_last_beacon);
#endif /* CONFIG_MAC80211_IBSS_DEBUG */
if (!tx_last_beacon)
return;
if (memcmp(mgmt->bssid, ifsta->bssid, ETH_ALEN) != 0 &&
memcmp(mgmt->bssid, "\xff\xff\xff\xff\xff\xff", ETH_ALEN) != 0)
return;
end = ((u8 *) mgmt) + len;
pos = mgmt->u.probe_req.variable;
if (pos[0] != WLAN_EID_SSID ||
pos + 2 + pos[1] > end) {
if (net_ratelimit()) {
printk(KERN_DEBUG "%s: Invalid SSID IE in ProbeReq "
"from " MAC_FMT "\n",
dev->name, MAC_ARG(mgmt->sa));
}
return;
}
if (pos[1] != 0 &&
(pos[1] != ifsta->ssid_len ||
memcmp(pos + 2, ifsta->ssid, ifsta->ssid_len) != 0)) {
/* Ignore ProbeReq for foreign SSID */
return;
}
/* Reply with ProbeResp */
skb = skb_copy(ifsta->probe_resp, GFP_ATOMIC);
if (!skb)
return;
resp = (struct ieee80211_mgmt *) skb->data;
memcpy(resp->da, mgmt->sa, ETH_ALEN);
#ifdef CONFIG_MAC80211_IBSS_DEBUG
printk(KERN_DEBUG "%s: Sending ProbeResp to " MAC_FMT "\n",
dev->name, MAC_ARG(resp->da));
#endif /* CONFIG_MAC80211_IBSS_DEBUG */
ieee80211_sta_tx(dev, skb, 0);
}
void ieee80211_sta_rx_mgmt(struct net_device *dev, struct sk_buff *skb,
struct ieee80211_rx_status *rx_status)
{
struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
struct ieee80211_sub_if_data *sdata;
struct ieee80211_if_sta *ifsta;
struct ieee80211_mgmt *mgmt;
u16 fc;
if (skb->len < 24)
goto fail;
sdata = IEEE80211_DEV_TO_SUB_IF(dev);
ifsta = &sdata->u.sta;
mgmt = (struct ieee80211_mgmt *) skb->data;
fc = le16_to_cpu(mgmt->frame_control);
switch (fc & IEEE80211_FCTL_STYPE) {
case IEEE80211_STYPE_PROBE_REQ:
case IEEE80211_STYPE_PROBE_RESP:
case IEEE80211_STYPE_BEACON:
memcpy(skb->cb, rx_status, sizeof(*rx_status));
case IEEE80211_STYPE_AUTH:
case IEEE80211_STYPE_ASSOC_RESP:
case IEEE80211_STYPE_REASSOC_RESP:
case IEEE80211_STYPE_DEAUTH:
case IEEE80211_STYPE_DISASSOC:
skb_queue_tail(&ifsta->skb_queue, skb);
queue_work(local->hw.workqueue, &ifsta->work);
return;
default:
printk(KERN_DEBUG "%s: received unknown management frame - "
"stype=%d\n", dev->name,
(fc & IEEE80211_FCTL_STYPE) >> 4);
break;
}
fail:
kfree_skb(skb);
}
static void ieee80211_sta_rx_queued_mgmt(struct net_device *dev,
struct sk_buff *skb)
{
struct ieee80211_rx_status *rx_status;
struct ieee80211_sub_if_data *sdata;
struct ieee80211_if_sta *ifsta;
struct ieee80211_mgmt *mgmt;
u16 fc;
sdata = IEEE80211_DEV_TO_SUB_IF(dev);
ifsta = &sdata->u.sta;
rx_status = (struct ieee80211_rx_status *) skb->cb;
mgmt = (struct ieee80211_mgmt *) skb->data;
fc = le16_to_cpu(mgmt->frame_control);
switch (fc & IEEE80211_FCTL_STYPE) {
case IEEE80211_STYPE_PROBE_REQ:
ieee80211_rx_mgmt_probe_req(dev, ifsta, mgmt, skb->len,
rx_status);
break;
case IEEE80211_STYPE_PROBE_RESP:
ieee80211_rx_mgmt_probe_resp(dev, mgmt, skb->len, rx_status);
break;
case IEEE80211_STYPE_BEACON:
ieee80211_rx_mgmt_beacon(dev, mgmt, skb->len, rx_status);
break;
case IEEE80211_STYPE_AUTH:
ieee80211_rx_mgmt_auth(dev, ifsta, mgmt, skb->len);
break;
case IEEE80211_STYPE_ASSOC_RESP:
ieee80211_rx_mgmt_assoc_resp(dev, ifsta, mgmt, skb->len, 0);
break;
case IEEE80211_STYPE_REASSOC_RESP:
ieee80211_rx_mgmt_assoc_resp(dev, ifsta, mgmt, skb->len, 1);
break;
case IEEE80211_STYPE_DEAUTH:
ieee80211_rx_mgmt_deauth(dev, ifsta, mgmt, skb->len);
break;
case IEEE80211_STYPE_DISASSOC:
ieee80211_rx_mgmt_disassoc(dev, ifsta, mgmt, skb->len);
break;
}
kfree_skb(skb);
}
void ieee80211_sta_rx_scan(struct net_device *dev, struct sk_buff *skb,
struct ieee80211_rx_status *rx_status)
{
struct ieee80211_mgmt *mgmt;
u16 fc;
if (skb->len < 24) {
dev_kfree_skb(skb);
return;
}
mgmt = (struct ieee80211_mgmt *) skb->data;
fc = le16_to_cpu(mgmt->frame_control);
if ((fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_MGMT) {
if ((fc & IEEE80211_FCTL_STYPE) == IEEE80211_STYPE_PROBE_RESP) {
ieee80211_rx_mgmt_probe_resp(dev, mgmt,
skb->len, rx_status);
} else if ((fc & IEEE80211_FCTL_STYPE) == IEEE80211_STYPE_BEACON) {
ieee80211_rx_mgmt_beacon(dev, mgmt, skb->len,
rx_status);
}
}
dev_kfree_skb(skb);
}
static int ieee80211_sta_active_ibss(struct net_device *dev)
{
struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
int active = 0;
struct sta_info *sta;
spin_lock_bh(&local->sta_lock);
list_for_each_entry(sta, &local->sta_list, list) {
if (sta->dev == dev &&
time_after(sta->last_rx + IEEE80211_IBSS_MERGE_INTERVAL,
jiffies)) {
active++;
break;
}
}
spin_unlock_bh(&local->sta_lock);
return active;
}
static void ieee80211_sta_expire(struct net_device *dev)
{
struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
struct sta_info *sta, *tmp;
spin_lock_bh(&local->sta_lock);
list_for_each_entry_safe(sta, tmp, &local->sta_list, list)
if (time_after(jiffies, sta->last_rx +
IEEE80211_IBSS_INACTIVITY_LIMIT)) {
printk(KERN_DEBUG "%s: expiring inactive STA " MAC_FMT
"\n", dev->name, MAC_ARG(sta->addr));
sta_info_free(sta, 1);
}
spin_unlock_bh(&local->sta_lock);
}
static void ieee80211_sta_merge_ibss(struct net_device *dev,
struct ieee80211_if_sta *ifsta)
{
mod_timer(&ifsta->timer, jiffies + IEEE80211_IBSS_MERGE_INTERVAL);
ieee80211_sta_expire(dev);
if (ieee80211_sta_active_ibss(dev))
return;
printk(KERN_DEBUG "%s: No active IBSS STAs - trying to scan for other "
"IBSS networks with same SSID (merge)\n", dev->name);
ieee80211_sta_req_scan(dev, ifsta->ssid, ifsta->ssid_len);
}
void ieee80211_sta_timer(unsigned long data)
{
struct ieee80211_sub_if_data *sdata =
(struct ieee80211_sub_if_data *) data;
struct ieee80211_if_sta *ifsta = &sdata->u.sta;
struct ieee80211_local *local = wdev_priv(&sdata->wdev);
set_bit(IEEE80211_STA_REQ_RUN, &ifsta->request);
queue_work(local->hw.workqueue, &ifsta->work);
}
void ieee80211_sta_work(struct work_struct *work)
{
struct ieee80211_sub_if_data *sdata =
container_of(work, struct ieee80211_sub_if_data, u.sta.work);
struct net_device *dev = sdata->dev;
struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
struct ieee80211_if_sta *ifsta;
struct sk_buff *skb;
if (!netif_running(dev))
return;
if (local->sta_scanning)
return;
if (sdata->type != IEEE80211_IF_TYPE_STA &&
sdata->type != IEEE80211_IF_TYPE_IBSS) {
printk(KERN_DEBUG "%s: ieee80211_sta_work: non-STA interface "
"(type=%d)\n", dev->name, sdata->type);
return;
}
ifsta = &sdata->u.sta;
while ((skb = skb_dequeue(&ifsta->skb_queue)))
ieee80211_sta_rx_queued_mgmt(dev, skb);
if (ifsta->state != IEEE80211_AUTHENTICATE &&
ifsta->state != IEEE80211_ASSOCIATE &&
test_and_clear_bit(IEEE80211_STA_REQ_SCAN, &ifsta->request)) {
ieee80211_sta_start_scan(dev, NULL, 0);
return;
}
if (test_and_clear_bit(IEEE80211_STA_REQ_AUTH, &ifsta->request)) {
if (ieee80211_sta_config_auth(dev, ifsta))
return;
clear_bit(IEEE80211_STA_REQ_RUN, &ifsta->request);
} else if (!test_and_clear_bit(IEEE80211_STA_REQ_RUN, &ifsta->request))
return;
switch (ifsta->state) {
case IEEE80211_DISABLED:
break;
case IEEE80211_AUTHENTICATE:
ieee80211_authenticate(dev, ifsta);
break;
case IEEE80211_ASSOCIATE:
ieee80211_associate(dev, ifsta);
break;
case IEEE80211_ASSOCIATED:
ieee80211_associated(dev, ifsta);
break;
case IEEE80211_IBSS_SEARCH:
ieee80211_sta_find_ibss(dev, ifsta);
break;
case IEEE80211_IBSS_JOINED:
ieee80211_sta_merge_ibss(dev, ifsta);
break;
default:
printk(KERN_DEBUG "ieee80211_sta_work: Unknown state %d\n",
ifsta->state);
break;
}
if (ieee80211_privacy_mismatch(dev, ifsta)) {
printk(KERN_DEBUG "%s: privacy configuration mismatch and "
"mixed-cell disabled - disassociate\n", dev->name);
ieee80211_send_disassoc(dev, ifsta, WLAN_REASON_UNSPECIFIED);
ieee80211_set_disassoc(dev, ifsta, 0);
}
}
static void ieee80211_sta_reset_auth(struct net_device *dev,
struct ieee80211_if_sta *ifsta)
{
struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
if (local->ops->reset_tsf) {
/* Reset own TSF to allow time synchronization work. */
local->ops->reset_tsf(local_to_hw(local));
}
ifsta->wmm_last_param_set = -1; /* allow any WMM update */
if (ifsta->auth_algs & IEEE80211_AUTH_ALG_OPEN)
ifsta->auth_alg = WLAN_AUTH_OPEN;
else if (ifsta->auth_algs & IEEE80211_AUTH_ALG_SHARED_KEY)
ifsta->auth_alg = WLAN_AUTH_SHARED_KEY;
else if (ifsta->auth_algs & IEEE80211_AUTH_ALG_LEAP)
ifsta->auth_alg = WLAN_AUTH_LEAP;
else
ifsta->auth_alg = WLAN_AUTH_OPEN;
printk(KERN_DEBUG "%s: Initial auth_alg=%d\n", dev->name,
ifsta->auth_alg);
ifsta->auth_transaction = -1;
ifsta->associated = ifsta->auth_tries = ifsta->assoc_tries = 0;
netif_carrier_off(dev);
}
void ieee80211_sta_req_auth(struct net_device *dev,
struct ieee80211_if_sta *ifsta)
{
struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
if (sdata->type != IEEE80211_IF_TYPE_STA)
return;
if ((ifsta->bssid_set || ifsta->auto_bssid_sel) &&
(ifsta->ssid_set || ifsta->auto_ssid_sel)) {
set_bit(IEEE80211_STA_REQ_AUTH, &ifsta->request);
queue_work(local->hw.workqueue, &ifsta->work);
}
}
static int ieee80211_sta_match_ssid(struct ieee80211_if_sta *ifsta,
const char *ssid, int ssid_len)
{
int tmp, hidden_ssid;
if (!memcmp(ifsta->ssid, ssid, ssid_len))
return 1;
if (ifsta->auto_bssid_sel)
return 0;
hidden_ssid = 1;
tmp = ssid_len;
while (tmp--) {
if (ssid[tmp] != '\0') {
hidden_ssid = 0;
break;
}
}
if (hidden_ssid && ifsta->ssid_len == ssid_len)
return 1;
if (ssid_len == 1 && ssid[0] == ' ')
return 1;
return 0;
}
static int ieee80211_sta_config_auth(struct net_device *dev,
struct ieee80211_if_sta *ifsta)
{
struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
struct ieee80211_sta_bss *bss, *selected = NULL;
int top_rssi = 0, freq;
rtnl_lock();
if (!ifsta->auto_channel_sel && !ifsta->auto_bssid_sel &&
!ifsta->auto_ssid_sel) {
ifsta->state = IEEE80211_AUTHENTICATE;
rtnl_unlock();
ieee80211_sta_reset_auth(dev, ifsta);
return 0;
}
spin_lock_bh(&local->sta_bss_lock);
freq = local->oper_channel->freq;
list_for_each_entry(bss, &local->sta_bss_list, list) {
if (!(bss->capability & WLAN_CAPABILITY_ESS))
continue;
if (!!(bss->capability & WLAN_CAPABILITY_PRIVACY) ^
!!sdata->default_key)
continue;
if (!ifsta->auto_channel_sel && bss->freq != freq)
continue;
if (!ifsta->auto_bssid_sel &&
memcmp(bss->bssid, ifsta->bssid, ETH_ALEN))
continue;
if (!ifsta->auto_ssid_sel &&
!ieee80211_sta_match_ssid(ifsta, bss->ssid, bss->ssid_len))
continue;
if (!selected || top_rssi < bss->rssi) {
selected = bss;
top_rssi = bss->rssi;
}
}
if (selected)
atomic_inc(&selected->users);
spin_unlock_bh(&local->sta_bss_lock);
if (selected) {
ieee80211_set_channel(local, -1, selected->freq);
if (!ifsta->ssid_set)
ieee80211_sta_set_ssid(dev, selected->ssid,
selected->ssid_len);
ieee80211_sta_set_bssid(dev, selected->bssid);
ieee80211_rx_bss_put(dev, selected);
ifsta->state = IEEE80211_AUTHENTICATE;
rtnl_unlock();
ieee80211_sta_reset_auth(dev, ifsta);
return 0;
} else {
if (ifsta->state != IEEE80211_AUTHENTICATE) {
ieee80211_sta_start_scan(dev, NULL, 0);
ifsta->state = IEEE80211_AUTHENTICATE;
set_bit(IEEE80211_STA_REQ_AUTH, &ifsta->request);
} else
ifsta->state = IEEE80211_DISABLED;
}
rtnl_unlock();
return -1;
}
static int ieee80211_sta_join_ibss(struct net_device *dev,
struct ieee80211_if_sta *ifsta,
struct ieee80211_sta_bss *bss)
{
struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
int res, rates, i, j;
struct sk_buff *skb;
struct ieee80211_mgmt *mgmt;
struct ieee80211_tx_control control;
struct ieee80211_rate *rate;
struct ieee80211_hw_mode *mode;
struct rate_control_extra extra;
u8 *pos;
struct ieee80211_sub_if_data *sdata;
/* Remove possible STA entries from other IBSS networks. */
sta_info_flush(local, NULL);
if (local->ops->reset_tsf) {
/* Reset own TSF to allow time synchronization work. */
local->ops->reset_tsf(local_to_hw(local));
}
memcpy(ifsta->bssid, bss->bssid, ETH_ALEN);
res = ieee80211_if_config(dev);
if (res)
return res;
local->hw.conf.beacon_int = bss->beacon_int >= 10 ? bss->beacon_int : 10;
sdata = IEEE80211_DEV_TO_SUB_IF(dev);
sdata->drop_unencrypted = bss->capability &
WLAN_CAPABILITY_PRIVACY ? 1 : 0;
res = ieee80211_set_channel(local, -1, bss->freq);
if (!(local->oper_channel->flag & IEEE80211_CHAN_W_IBSS)) {
printk(KERN_DEBUG "%s: IBSS not allowed on channel %d "
"(%d MHz)\n", dev->name, local->hw.conf.channel,
local->hw.conf.freq);
return -1;
}
/* Set beacon template based on scan results */
skb = dev_alloc_skb(local->hw.extra_tx_headroom + 400);
do {
if (!skb)
break;
skb_reserve(skb, local->hw.extra_tx_headroom);
mgmt = (struct ieee80211_mgmt *)
skb_put(skb, 24 + sizeof(mgmt->u.beacon));
memset(mgmt, 0, 24 + sizeof(mgmt->u.beacon));
mgmt->frame_control = IEEE80211_FC(IEEE80211_FTYPE_MGMT,
IEEE80211_STYPE_BEACON);
memset(mgmt->da, 0xff, ETH_ALEN);
memcpy(mgmt->sa, dev->dev_addr, ETH_ALEN);
memcpy(mgmt->bssid, ifsta->bssid, ETH_ALEN);
mgmt->u.beacon.beacon_int =
cpu_to_le16(local->hw.conf.beacon_int);
mgmt->u.beacon.capab_info = cpu_to_le16(bss->capability);
pos = skb_put(skb, 2 + ifsta->ssid_len);
*pos++ = WLAN_EID_SSID;
*pos++ = ifsta->ssid_len;
memcpy(pos, ifsta->ssid, ifsta->ssid_len);
rates = bss->supp_rates_len;
if (rates > 8)
rates = 8;
pos = skb_put(skb, 2 + rates);
*pos++ = WLAN_EID_SUPP_RATES;
*pos++ = rates;
memcpy(pos, bss->supp_rates, rates);
pos = skb_put(skb, 2 + 1);
*pos++ = WLAN_EID_DS_PARAMS;
*pos++ = 1;
*pos++ = bss->channel;
pos = skb_put(skb, 2 + 2);
*pos++ = WLAN_EID_IBSS_PARAMS;
*pos++ = 2;
/* FIX: set ATIM window based on scan results */
*pos++ = 0;
*pos++ = 0;
if (bss->supp_rates_len > 8) {
rates = bss->supp_rates_len - 8;
pos = skb_put(skb, 2 + rates);
*pos++ = WLAN_EID_EXT_SUPP_RATES;
*pos++ = rates;
memcpy(pos, &bss->supp_rates[8], rates);
}
memset(&control, 0, sizeof(control));
memset(&extra, 0, sizeof(extra));
extra.mode = local->oper_hw_mode;
rate = rate_control_get_rate(local, dev, skb, &extra);
if (!rate) {
printk(KERN_DEBUG "%s: Failed to determine TX rate "
"for IBSS beacon\n", dev->name);
break;
}
control.tx_rate = (local->short_preamble &&
(rate->flags & IEEE80211_RATE_PREAMBLE2)) ?
rate->val2 : rate->val;
control.antenna_sel_tx = local->hw.conf.antenna_sel_tx;
control.power_level = local->hw.conf.power_level;
control.flags |= IEEE80211_TXCTL_NO_ACK;
control.retry_limit = 1;
ifsta->probe_resp = skb_copy(skb, GFP_ATOMIC);
if (ifsta->probe_resp) {
mgmt = (struct ieee80211_mgmt *)
ifsta->probe_resp->data;
mgmt->frame_control =
IEEE80211_FC(IEEE80211_FTYPE_MGMT,
IEEE80211_STYPE_PROBE_RESP);
} else {
printk(KERN_DEBUG "%s: Could not allocate ProbeResp "
"template for IBSS\n", dev->name);
}
if (local->ops->beacon_update &&
local->ops->beacon_update(local_to_hw(local),
skb, &control) == 0) {
printk(KERN_DEBUG "%s: Configured IBSS beacon "
"template based on scan results\n", dev->name);
skb = NULL;
}
rates = 0;
mode = local->oper_hw_mode;
for (i = 0; i < bss->supp_rates_len; i++) {
int bitrate = (bss->supp_rates[i] & 0x7f) * 5;
if (mode->mode == MODE_ATHEROS_TURBO)
bitrate *= 2;
for (j = 0; j < mode->num_rates; j++)
if (mode->rates[j].rate == bitrate)
rates |= BIT(j);
}
ifsta->supp_rates_bits = rates;
} while (0);
if (skb) {
printk(KERN_DEBUG "%s: Failed to configure IBSS beacon "
"template\n", dev->name);
dev_kfree_skb(skb);
}
ifsta->state = IEEE80211_IBSS_JOINED;
mod_timer(&ifsta->timer, jiffies + IEEE80211_IBSS_MERGE_INTERVAL);
ieee80211_rx_bss_put(dev, bss);
return res;
}
static int ieee80211_sta_create_ibss(struct net_device *dev,
struct ieee80211_if_sta *ifsta)
{
struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
struct ieee80211_sta_bss *bss;
struct ieee80211_sub_if_data *sdata;
struct ieee80211_hw_mode *mode;
u8 bssid[ETH_ALEN], *pos;
int i;
#if 0
/* Easier testing, use fixed BSSID. */
memset(bssid, 0xfe, ETH_ALEN);
#else
/* Generate random, not broadcast, locally administered BSSID. Mix in
* own MAC address to make sure that devices that do not have proper
* random number generator get different BSSID. */
get_random_bytes(bssid, ETH_ALEN);
for (i = 0; i < ETH_ALEN; i++)
bssid[i] ^= dev->dev_addr[i];
bssid[0] &= ~0x01;
bssid[0] |= 0x02;
#endif
printk(KERN_DEBUG "%s: Creating new IBSS network, BSSID " MAC_FMT "\n",
dev->name, MAC_ARG(bssid));
bss = ieee80211_rx_bss_add(dev, bssid);
if (!bss)
return -ENOMEM;
sdata = IEEE80211_DEV_TO_SUB_IF(dev);
mode = local->oper_hw_mode;
if (local->hw.conf.beacon_int == 0)
local->hw.conf.beacon_int = 100;
bss->beacon_int = local->hw.conf.beacon_int;
bss->hw_mode = local->hw.conf.phymode;
bss->channel = local->hw.conf.channel;
bss->freq = local->hw.conf.freq;
bss->last_update = jiffies;
bss->capability = WLAN_CAPABILITY_IBSS;
if (sdata->default_key) {
bss->capability |= WLAN_CAPABILITY_PRIVACY;
} else
sdata->drop_unencrypted = 0;
bss->supp_rates_len = mode->num_rates;
pos = bss->supp_rates;
for (i = 0; i < mode->num_rates; i++) {
int rate = mode->rates[i].rate;
if (mode->mode == MODE_ATHEROS_TURBO)
rate /= 2;
*pos++ = (u8) (rate / 5);
}
return ieee80211_sta_join_ibss(dev, ifsta, bss);
}
static int ieee80211_sta_find_ibss(struct net_device *dev,
struct ieee80211_if_sta *ifsta)
{
struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
struct ieee80211_sta_bss *bss;
int found = 0;
u8 bssid[ETH_ALEN];
int active_ibss;
if (ifsta->ssid_len == 0)
return -EINVAL;
active_ibss = ieee80211_sta_active_ibss(dev);
#ifdef CONFIG_MAC80211_IBSS_DEBUG
printk(KERN_DEBUG "%s: sta_find_ibss (active_ibss=%d)\n",
dev->name, active_ibss);
#endif /* CONFIG_MAC80211_IBSS_DEBUG */
spin_lock_bh(&local->sta_bss_lock);
list_for_each_entry(bss, &local->sta_bss_list, list) {
if (ifsta->ssid_len != bss->ssid_len ||
memcmp(ifsta->ssid, bss->ssid, bss->ssid_len) != 0
|| !(bss->capability & WLAN_CAPABILITY_IBSS))
continue;
#ifdef CONFIG_MAC80211_IBSS_DEBUG
printk(KERN_DEBUG " bssid=" MAC_FMT " found\n",
MAC_ARG(bss->bssid));
#endif /* CONFIG_MAC80211_IBSS_DEBUG */
memcpy(bssid, bss->bssid, ETH_ALEN);
found = 1;
if (active_ibss || memcmp(bssid, ifsta->bssid, ETH_ALEN) != 0)
break;
}
spin_unlock_bh(&local->sta_bss_lock);
#ifdef CONFIG_MAC80211_IBSS_DEBUG
printk(KERN_DEBUG " sta_find_ibss: selected " MAC_FMT " current "
MAC_FMT "\n", MAC_ARG(bssid), MAC_ARG(ifsta->bssid));
#endif /* CONFIG_MAC80211_IBSS_DEBUG */
if (found && memcmp(ifsta->bssid, bssid, ETH_ALEN) != 0 &&
(bss = ieee80211_rx_bss_get(dev, bssid))) {
printk(KERN_DEBUG "%s: Selected IBSS BSSID " MAC_FMT
" based on configured SSID\n",
dev->name, MAC_ARG(bssid));
return ieee80211_sta_join_ibss(dev, ifsta, bss);
}
#ifdef CONFIG_MAC80211_IBSS_DEBUG
printk(KERN_DEBUG " did not try to join ibss\n");
#endif /* CONFIG_MAC80211_IBSS_DEBUG */
/* Selected IBSS not found in current scan results - try to scan */
if (ifsta->state == IEEE80211_IBSS_JOINED &&
!ieee80211_sta_active_ibss(dev)) {
mod_timer(&ifsta->timer, jiffies +
IEEE80211_IBSS_MERGE_INTERVAL);
} else if (time_after(jiffies, local->last_scan_completed +
IEEE80211_SCAN_INTERVAL)) {
printk(KERN_DEBUG "%s: Trigger new scan to find an IBSS to "
"join\n", dev->name);
return ieee80211_sta_req_scan(dev, ifsta->ssid,
ifsta->ssid_len);
} else if (ifsta->state != IEEE80211_IBSS_JOINED) {
int interval = IEEE80211_SCAN_INTERVAL;
if (time_after(jiffies, ifsta->ibss_join_req +
IEEE80211_IBSS_JOIN_TIMEOUT)) {
if (ifsta->create_ibss &&
local->oper_channel->flag & IEEE80211_CHAN_W_IBSS)
return ieee80211_sta_create_ibss(dev, ifsta);
if (ifsta->create_ibss) {
printk(KERN_DEBUG "%s: IBSS not allowed on the"
" configured channel %d (%d MHz)\n",
dev->name, local->hw.conf.channel,
local->hw.conf.freq);
}
/* No IBSS found - decrease scan interval and continue
* scanning. */
interval = IEEE80211_SCAN_INTERVAL_SLOW;
}
ifsta->state = IEEE80211_IBSS_SEARCH;
mod_timer(&ifsta->timer, jiffies + interval);
return 0;
}
return 0;
}
int ieee80211_sta_set_ssid(struct net_device *dev, char *ssid, size_t len)
{
struct ieee80211_sub_if_data *sdata;
struct ieee80211_if_sta *ifsta;
struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
if (len > IEEE80211_MAX_SSID_LEN)
return -EINVAL;
/* TODO: This should always be done for IBSS, even if IEEE80211_QOS is
* not defined. */
if (local->ops->conf_tx) {
struct ieee80211_tx_queue_params qparam;
int i;
memset(&qparam, 0, sizeof(qparam));
/* TODO: are these ok defaults for all hw_modes? */
qparam.aifs = 2;
qparam.cw_min =
local->hw.conf.phymode == MODE_IEEE80211B ? 31 : 15;
qparam.cw_max = 1023;
qparam.burst_time = 0;
for (i = IEEE80211_TX_QUEUE_DATA0; i < NUM_TX_DATA_QUEUES; i++)
{
local->ops->conf_tx(local_to_hw(local),
i + IEEE80211_TX_QUEUE_DATA0,
&qparam);
}
/* IBSS uses different parameters for Beacon sending */
qparam.cw_min++;
qparam.cw_min *= 2;
qparam.cw_min--;
local->ops->conf_tx(local_to_hw(local),
IEEE80211_TX_QUEUE_BEACON, &qparam);
}
sdata = IEEE80211_DEV_TO_SUB_IF(dev);
ifsta = &sdata->u.sta;
if (ifsta->ssid_len != len || memcmp(ifsta->ssid, ssid, len) != 0)
ifsta->prev_bssid_set = 0;
memcpy(ifsta->ssid, ssid, len);
memset(ifsta->ssid + len, 0, IEEE80211_MAX_SSID_LEN - len);
ifsta->ssid_len = len;
ifsta->ssid_set = len ? 1 : 0;
if (sdata->type == IEEE80211_IF_TYPE_IBSS && !ifsta->bssid_set) {
ifsta->ibss_join_req = jiffies;
ifsta->state = IEEE80211_IBSS_SEARCH;
return ieee80211_sta_find_ibss(dev, ifsta);
}
return 0;
}
int ieee80211_sta_get_ssid(struct net_device *dev, char *ssid, size_t *len)
{
struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
struct ieee80211_if_sta *ifsta = &sdata->u.sta;
memcpy(ssid, ifsta->ssid, ifsta->ssid_len);
*len = ifsta->ssid_len;
return 0;
}
int ieee80211_sta_set_bssid(struct net_device *dev, u8 *bssid)
{
struct ieee80211_sub_if_data *sdata;
struct ieee80211_if_sta *ifsta;
int res;
sdata = IEEE80211_DEV_TO_SUB_IF(dev);
ifsta = &sdata->u.sta;
if (memcmp(ifsta->bssid, bssid, ETH_ALEN) != 0) {
memcpy(ifsta->bssid, bssid, ETH_ALEN);
res = ieee80211_if_config(dev);
if (res) {
printk(KERN_DEBUG "%s: Failed to config new BSSID to "
"the low-level driver\n", dev->name);
return res;
}
}
if (!is_valid_ether_addr(bssid))
ifsta->bssid_set = 0;
else
ifsta->bssid_set = 1;
return 0;
}
static void ieee80211_send_nullfunc(struct ieee80211_local *local,
struct ieee80211_sub_if_data *sdata,
int powersave)
{
struct sk_buff *skb;
struct ieee80211_hdr *nullfunc;
u16 fc;
skb = dev_alloc_skb(local->hw.extra_tx_headroom + 24);
if (!skb) {
printk(KERN_DEBUG "%s: failed to allocate buffer for nullfunc "
"frame\n", sdata->dev->name);
return;
}
skb_reserve(skb, local->hw.extra_tx_headroom);
nullfunc = (struct ieee80211_hdr *) skb_put(skb, 24);
memset(nullfunc, 0, 24);
fc = IEEE80211_FTYPE_DATA | IEEE80211_STYPE_NULLFUNC |
IEEE80211_FCTL_TODS;
if (powersave)
fc |= IEEE80211_FCTL_PM;
nullfunc->frame_control = cpu_to_le16(fc);
memcpy(nullfunc->addr1, sdata->u.sta.bssid, ETH_ALEN);
memcpy(nullfunc->addr2, sdata->dev->dev_addr, ETH_ALEN);
memcpy(nullfunc->addr3, sdata->u.sta.bssid, ETH_ALEN);
ieee80211_sta_tx(sdata->dev, skb, 0);
}
void ieee80211_scan_completed(struct ieee80211_hw *hw)
{
struct ieee80211_local *local = hw_to_local(hw);
struct net_device *dev = local->scan_dev;
struct ieee80211_sub_if_data *sdata;
union iwreq_data wrqu;
local->last_scan_completed = jiffies;
wmb();
local->sta_scanning = 0;
if (ieee80211_hw_config(local))
printk(KERN_DEBUG "%s: failed to restore operational"
"channel after scan\n", dev->name);
if (!(local->hw.flags & IEEE80211_HW_NO_PROBE_FILTERING) &&
ieee80211_if_config(dev))
printk(KERN_DEBUG "%s: failed to restore operational"
"BSSID after scan\n", dev->name);
memset(&wrqu, 0, sizeof(wrqu));
wireless_send_event(dev, SIOCGIWSCAN, &wrqu, NULL);
read_lock(&local->sub_if_lock);
list_for_each_entry(sdata, &local->sub_if_list, list) {
/* No need to wake the master device. */
if (sdata->dev == local->mdev)
continue;
if (sdata->type == IEEE80211_IF_TYPE_STA) {
if (sdata->u.sta.associated)
ieee80211_send_nullfunc(local, sdata, 0);
ieee80211_sta_timer((unsigned long)sdata);
}
netif_wake_queue(sdata->dev);
}
read_unlock(&local->sub_if_lock);
sdata = IEEE80211_DEV_TO_SUB_IF(dev);
if (sdata->type == IEEE80211_IF_TYPE_IBSS) {
struct ieee80211_if_sta *ifsta = &sdata->u.sta;
if (!ifsta->bssid_set ||
(!ifsta->state == IEEE80211_IBSS_JOINED &&
!ieee80211_sta_active_ibss(dev)))
ieee80211_sta_find_ibss(dev, ifsta);
}
}
EXPORT_SYMBOL(ieee80211_scan_completed);
void ieee80211_sta_scan_work(struct work_struct *work)
{
struct ieee80211_local *local =
container_of(work, struct ieee80211_local, scan_work.work);
struct net_device *dev = local->scan_dev;
struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
struct ieee80211_hw_mode *mode;
struct ieee80211_channel *chan;
int skip;
unsigned long next_delay = 0;
if (!local->sta_scanning)
return;
switch (local->scan_state) {
case SCAN_SET_CHANNEL:
mode = local->scan_hw_mode;
if (local->scan_hw_mode->list.next == &local->modes_list &&
local->scan_channel_idx >= mode->num_channels) {
ieee80211_scan_completed(local_to_hw(local));
return;
}
skip = !(local->enabled_modes & (1 << mode->mode));
chan = &mode->channels[local->scan_channel_idx];
if (!(chan->flag & IEEE80211_CHAN_W_SCAN) ||
(sdata->type == IEEE80211_IF_TYPE_IBSS &&
!(chan->flag & IEEE80211_CHAN_W_IBSS)) ||
(local->hw_modes & local->enabled_modes &
(1 << MODE_IEEE80211G) && mode->mode == MODE_IEEE80211B))
skip = 1;
if (!skip) {
#if 0
printk(KERN_DEBUG "%s: scan channel %d (%d MHz)\n",
dev->name, chan->chan, chan->freq);
#endif
local->scan_channel = chan;
if (ieee80211_hw_config(local)) {
printk(KERN_DEBUG "%s: failed to set channel "
"%d (%d MHz) for scan\n", dev->name,
chan->chan, chan->freq);
skip = 1;
}
}
local->scan_channel_idx++;
if (local->scan_channel_idx >= local->scan_hw_mode->num_channels) {
if (local->scan_hw_mode->list.next != &local->modes_list) {
local->scan_hw_mode = list_entry(local->scan_hw_mode->list.next,
struct ieee80211_hw_mode,
list);
local->scan_channel_idx = 0;
}
}
if (skip)
break;
next_delay = IEEE80211_PROBE_DELAY +
usecs_to_jiffies(local->hw.channel_change_time);
local->scan_state = SCAN_SEND_PROBE;
break;
case SCAN_SEND_PROBE:
if (local->scan_channel->flag & IEEE80211_CHAN_W_ACTIVE_SCAN) {
ieee80211_send_probe_req(dev, NULL, local->scan_ssid,
local->scan_ssid_len);
next_delay = IEEE80211_CHANNEL_TIME;
} else
next_delay = IEEE80211_PASSIVE_CHANNEL_TIME;
local->scan_state = SCAN_SET_CHANNEL;
break;
}
if (local->sta_scanning)
queue_delayed_work(local->hw.workqueue, &local->scan_work,
next_delay);
}
static int ieee80211_sta_start_scan(struct net_device *dev,
u8 *ssid, size_t ssid_len)
{
struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
struct ieee80211_sub_if_data *sdata;
if (ssid_len > IEEE80211_MAX_SSID_LEN)
return -EINVAL;
/* MLME-SCAN.request (page 118) page 144 (11.1.3.1)
* BSSType: INFRASTRUCTURE, INDEPENDENT, ANY_BSS
* BSSID: MACAddress
* SSID
* ScanType: ACTIVE, PASSIVE
* ProbeDelay: delay (in microseconds) to be used prior to transmitting
* a Probe frame during active scanning
* ChannelList
* MinChannelTime (>= ProbeDelay), in TU
* MaxChannelTime: (>= MinChannelTime), in TU
*/
/* MLME-SCAN.confirm
* BSSDescriptionSet
* ResultCode: SUCCESS, INVALID_PARAMETERS
*/
if (local->sta_scanning) {
if (local->scan_dev == dev)
return 0;
return -EBUSY;
}
if (local->ops->hw_scan) {
int rc = local->ops->hw_scan(local_to_hw(local),
ssid, ssid_len);
if (!rc) {
local->sta_scanning = 1;
local->scan_dev = dev;
}
return rc;
}
local->sta_scanning = 1;
read_lock(&local->sub_if_lock);
list_for_each_entry(sdata, &local->sub_if_list, list) {
/* Don't stop the master interface, otherwise we can't transmit
* probes! */
if (sdata->dev == local->mdev)
continue;
netif_stop_queue(sdata->dev);
if (sdata->type == IEEE80211_IF_TYPE_STA &&
sdata->u.sta.associated)
ieee80211_send_nullfunc(local, sdata, 1);
}
read_unlock(&local->sub_if_lock);
if (ssid) {
local->scan_ssid_len = ssid_len;
memcpy(local->scan_ssid, ssid, ssid_len);
} else
local->scan_ssid_len = 0;
local->scan_state = SCAN_SET_CHANNEL;
local->scan_hw_mode = list_entry(local->modes_list.next,
struct ieee80211_hw_mode,
list);
local->scan_channel_idx = 0;
local->scan_dev = dev;
if (!(local->hw.flags & IEEE80211_HW_NO_PROBE_FILTERING) &&
ieee80211_if_config(dev))
printk(KERN_DEBUG "%s: failed to set BSSID for scan\n",
dev->name);
/* TODO: start scan as soon as all nullfunc frames are ACKed */
queue_delayed_work(local->hw.workqueue, &local->scan_work,
IEEE80211_CHANNEL_TIME);
return 0;
}
int ieee80211_sta_req_scan(struct net_device *dev, u8 *ssid, size_t ssid_len)
{
struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
struct ieee80211_if_sta *ifsta = &sdata->u.sta;
struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
if (sdata->type != IEEE80211_IF_TYPE_STA)
return ieee80211_sta_start_scan(dev, ssid, ssid_len);
if (local->sta_scanning) {
if (local->scan_dev == dev)
return 0;
return -EBUSY;
}
set_bit(IEEE80211_STA_REQ_SCAN, &ifsta->request);
queue_work(local->hw.workqueue, &ifsta->work);
return 0;
}
static char *
ieee80211_sta_scan_result(struct net_device *dev,
struct ieee80211_sta_bss *bss,
char *current_ev, char *end_buf)
{
struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
struct iw_event iwe;
if (time_after(jiffies,
bss->last_update + IEEE80211_SCAN_RESULT_EXPIRE))
return current_ev;
if (!(local->enabled_modes & (1 << bss->hw_mode)))
return current_ev;
if (local->scan_flags & IEEE80211_SCAN_WPA_ONLY &&
!bss->wpa_ie && !bss->rsn_ie)
return current_ev;
if (local->scan_flags & IEEE80211_SCAN_MATCH_SSID &&
(local->scan_ssid_len != bss->ssid_len ||
memcmp(local->scan_ssid, bss->ssid, bss->ssid_len) != 0))
return current_ev;
memset(&iwe, 0, sizeof(iwe));
iwe.cmd = SIOCGIWAP;
iwe.u.ap_addr.sa_family = ARPHRD_ETHER;
memcpy(iwe.u.ap_addr.sa_data, bss->bssid, ETH_ALEN);
current_ev = iwe_stream_add_event(current_ev, end_buf, &iwe,
IW_EV_ADDR_LEN);
memset(&iwe, 0, sizeof(iwe));
iwe.cmd = SIOCGIWESSID;
iwe.u.data.length = bss->ssid_len;
iwe.u.data.flags = 1;
current_ev = iwe_stream_add_point(current_ev, end_buf, &iwe,
bss->ssid);
if (bss->capability & (WLAN_CAPABILITY_ESS | WLAN_CAPABILITY_IBSS)) {
memset(&iwe, 0, sizeof(iwe));
iwe.cmd = SIOCGIWMODE;
if (bss->capability & WLAN_CAPABILITY_ESS)
iwe.u.mode = IW_MODE_MASTER;
else
iwe.u.mode = IW_MODE_ADHOC;
current_ev = iwe_stream_add_event(current_ev, end_buf, &iwe,
IW_EV_UINT_LEN);
}
memset(&iwe, 0, sizeof(iwe));
iwe.cmd = SIOCGIWFREQ;
iwe.u.freq.m = bss->channel;
iwe.u.freq.e = 0;
current_ev = iwe_stream_add_event(current_ev, end_buf, &iwe,
IW_EV_FREQ_LEN);
iwe.u.freq.m = bss->freq * 100000;
iwe.u.freq.e = 1;
current_ev = iwe_stream_add_event(current_ev, end_buf, &iwe,
IW_EV_FREQ_LEN);
memset(&iwe, 0, sizeof(iwe));
iwe.cmd = IWEVQUAL;
iwe.u.qual.qual = bss->signal;
iwe.u.qual.level = bss->rssi;
iwe.u.qual.noise = bss->noise;
iwe.u.qual.updated = local->wstats_flags;
current_ev = iwe_stream_add_event(current_ev, end_buf, &iwe,
IW_EV_QUAL_LEN);
memset(&iwe, 0, sizeof(iwe));
iwe.cmd = SIOCGIWENCODE;
if (bss->capability & WLAN_CAPABILITY_PRIVACY)
iwe.u.data.flags = IW_ENCODE_ENABLED | IW_ENCODE_NOKEY;
else
iwe.u.data.flags = IW_ENCODE_DISABLED;
iwe.u.data.length = 0;
current_ev = iwe_stream_add_point(current_ev, end_buf, &iwe, "");
if (bss && bss->wpa_ie) {
memset(&iwe, 0, sizeof(iwe));
iwe.cmd = IWEVGENIE;
iwe.u.data.length = bss->wpa_ie_len;
current_ev = iwe_stream_add_point(current_ev, end_buf, &iwe,
bss->wpa_ie);
}
if (bss && bss->rsn_ie) {
memset(&iwe, 0, sizeof(iwe));
iwe.cmd = IWEVGENIE;
iwe.u.data.length = bss->rsn_ie_len;
current_ev = iwe_stream_add_point(current_ev, end_buf, &iwe,
bss->rsn_ie);
}
if (bss && bss->supp_rates_len > 0) {
/* display all supported rates in readable format */
char *p = current_ev + IW_EV_LCP_LEN;
int i;
memset(&iwe, 0, sizeof(iwe));
iwe.cmd = SIOCGIWRATE;
/* Those two flags are ignored... */
iwe.u.bitrate.fixed = iwe.u.bitrate.disabled = 0;
for (i = 0; i < bss->supp_rates_len; i++) {
iwe.u.bitrate.value = ((bss->supp_rates[i] &
0x7f) * 500000);
p = iwe_stream_add_value(current_ev, p,
end_buf, &iwe, IW_EV_PARAM_LEN);
}
current_ev = p;
}
if (bss) {
char *buf;
buf = kmalloc(30, GFP_ATOMIC);
if (buf) {
memset(&iwe, 0, sizeof(iwe));
iwe.cmd = IWEVCUSTOM;
sprintf(buf, "tsf=%016llx", (unsigned long long)(bss->timestamp));
iwe.u.data.length = strlen(buf);
current_ev = iwe_stream_add_point(current_ev, end_buf,
&iwe, buf);
kfree(buf);
}
}
do {
char *buf;
if (!(local->scan_flags & IEEE80211_SCAN_EXTRA_INFO))
break;
buf = kmalloc(100, GFP_ATOMIC);
if (!buf)
break;
memset(&iwe, 0, sizeof(iwe));
iwe.cmd = IWEVCUSTOM;
sprintf(buf, "bcn_int=%d", bss->beacon_int);
iwe.u.data.length = strlen(buf);
current_ev = iwe_stream_add_point(current_ev, end_buf, &iwe,
buf);
memset(&iwe, 0, sizeof(iwe));
iwe.cmd = IWEVCUSTOM;
sprintf(buf, "capab=0x%04x", bss->capability);
iwe.u.data.length = strlen(buf);
current_ev = iwe_stream_add_point(current_ev, end_buf, &iwe,
buf);
kfree(buf);
break;
} while (0);
return current_ev;
}
int ieee80211_sta_scan_results(struct net_device *dev, char *buf, size_t len)
{
struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
char *current_ev = buf;
char *end_buf = buf + len;
struct ieee80211_sta_bss *bss;
spin_lock_bh(&local->sta_bss_lock);
list_for_each_entry(bss, &local->sta_bss_list, list) {
if (buf + len - current_ev <= IW_EV_ADDR_LEN) {
spin_unlock_bh(&local->sta_bss_lock);
return -E2BIG;
}
current_ev = ieee80211_sta_scan_result(dev, bss, current_ev,
end_buf);
}
spin_unlock_bh(&local->sta_bss_lock);
return current_ev - buf;
}
int ieee80211_sta_set_extra_ie(struct net_device *dev, char *ie, size_t len)
{
struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
struct ieee80211_if_sta *ifsta = &sdata->u.sta;
kfree(ifsta->extra_ie);
if (len == 0) {
ifsta->extra_ie = NULL;
ifsta->extra_ie_len = 0;
return 0;
}
ifsta->extra_ie = kmalloc(len, GFP_KERNEL);
if (!ifsta->extra_ie) {
ifsta->extra_ie_len = 0;
return -ENOMEM;
}
memcpy(ifsta->extra_ie, ie, len);
ifsta->extra_ie_len = len;
return 0;
}
struct sta_info * ieee80211_ibss_add_sta(struct net_device *dev,
struct sk_buff *skb, u8 *bssid,
u8 *addr)
{
struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
struct sta_info *sta;
struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
/* TODO: Could consider removing the least recently used entry and
* allow new one to be added. */
if (local->num_sta >= IEEE80211_IBSS_MAX_STA_ENTRIES) {
if (net_ratelimit()) {
printk(KERN_DEBUG "%s: No room for a new IBSS STA "
"entry " MAC_FMT "\n", dev->name, MAC_ARG(addr));
}
return NULL;
}
printk(KERN_DEBUG "%s: Adding new IBSS station " MAC_FMT " (dev=%s)\n",
local->mdev->name, MAC_ARG(addr), dev->name);
sta = sta_info_add(local, dev, addr, GFP_ATOMIC);
if (!sta)
return NULL;
sta->supp_rates = sdata->u.sta.supp_rates_bits;
rate_control_rate_init(sta, local);
return sta; /* caller will call sta_info_put() */
}
int ieee80211_sta_deauthenticate(struct net_device *dev, u16 reason)
{
struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
struct ieee80211_if_sta *ifsta = &sdata->u.sta;
printk(KERN_DEBUG "%s: deauthenticate(reason=%d)\n",
dev->name, reason);
if (sdata->type != IEEE80211_IF_TYPE_STA &&
sdata->type != IEEE80211_IF_TYPE_IBSS)
return -EINVAL;
ieee80211_send_deauth(dev, ifsta, reason);
ieee80211_set_disassoc(dev, ifsta, 1);
return 0;
}
int ieee80211_sta_disassociate(struct net_device *dev, u16 reason)
{
struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
struct ieee80211_if_sta *ifsta = &sdata->u.sta;
printk(KERN_DEBUG "%s: disassociate(reason=%d)\n",
dev->name, reason);
if (sdata->type != IEEE80211_IF_TYPE_STA)
return -EINVAL;
if (!ifsta->associated)
return -1;
ieee80211_send_disassoc(dev, ifsta, reason);
ieee80211_set_disassoc(dev, ifsta, 0);
return 0;
}
Reference in New Issue View Git Blame Copy Permalink