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20d64713ae
linux-kernel-test/net/ieee80211/ieee80211_wx.c
James Ketrenos 20d64713ae [PATCH] ieee80211: Fixed a kernel oops on module unload 
tree 367069f24fc38b4aa910e86ff40094d2078d8aa7
parent a33a198201
author James Ketrenos <jketreno@linux.intel.com> 1124430800 -0500
committer James Ketrenos <jketreno@linux.intel.com> 1127310571 -0500

Fixed a kernel oops on module unload by adding spin lock protection to
ieee80211's crypt handlers (thanks to Zhu Yi)

Modified scan result logic to report WPA and RSN IEs if set (vs.being
based on wpa_enabled)

Added ieee80211_device as the first parameter to the crypt init()
method.  TKIP modified to use that structure for determining whether to
countermeasures are active.

Signed-off-by: James Ketrenos <jketreno@linux.intel.com>
Signed-off-by: Jeff Garzik <jgarzik@pobox.com>
2005-09-21 23:01:52 -04:00

489 lines
14 KiB
C
Raw Blame History

/******************************************************************************
Copyright(c) 2004 Intel Corporation. All rights reserved.
Portions of this file are based on the WEP enablement code provided by the
Host AP project hostap-drivers v0.1.3
Copyright (c) 2001-2002, SSH Communications Security Corp and Jouni Malinen
<jkmaline@cc.hut.fi>
Copyright (c) 2002-2003, Jouni Malinen <jkmaline@cc.hut.fi>
This program is free software; you can redistribute it and/or modify it
under the terms of version 2 of the GNU General Public License as
published by the Free Software Foundation.
This program is distributed in the hope that it will be useful, but WITHOUT
ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
more details.
You should have received a copy of the GNU General Public License along with
this program; if not, write to the Free Software Foundation, Inc., 59
Temple Place - Suite 330, Boston, MA 02111-1307, USA.
The full GNU General Public License is included in this distribution in the
file called LICENSE.
Contact Information:
James P. Ketrenos <ipw2100-admin@linux.intel.com>
Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
******************************************************************************/
#include <linux/kmod.h>
#include <linux/module.h>
#include <net/ieee80211.h>
#include <linux/wireless.h>
static const char *ieee80211_modes[] = {
"?", "a", "b", "ab", "g", "ag", "bg", "abg"
};
#define MAX_CUSTOM_LEN 64
static inline char *ipw2100_translate_scan(struct ieee80211_device *ieee,
char *start, char *stop,
struct ieee80211_network *network)
{
char custom[MAX_CUSTOM_LEN];
char *p;
struct iw_event iwe;
int i, j;
u8 max_rate, rate;
/* First entry *MUST* be the AP MAC address */
iwe.cmd = SIOCGIWAP;
iwe.u.ap_addr.sa_family = ARPHRD_ETHER;
memcpy(iwe.u.ap_addr.sa_data, network->bssid, ETH_ALEN);
start = iwe_stream_add_event(start, stop, &iwe, IW_EV_ADDR_LEN);
/* Remaining entries will be displayed in the order we provide them */
/* Add the ESSID */
iwe.cmd = SIOCGIWESSID;
iwe.u.data.flags = 1;
if (network->flags & NETWORK_EMPTY_ESSID) {
iwe.u.data.length = sizeof("<hidden>");
start = iwe_stream_add_point(start, stop, &iwe, "<hidden>");
} else {
iwe.u.data.length = min(network->ssid_len, (u8) 32);
start = iwe_stream_add_point(start, stop, &iwe, network->ssid);
}
/* Add the protocol name */
iwe.cmd = SIOCGIWNAME;
snprintf(iwe.u.name, IFNAMSIZ, "IEEE 802.11%s",
ieee80211_modes[network->mode]);
start = iwe_stream_add_event(start, stop, &iwe, IW_EV_CHAR_LEN);
/* Add mode */
iwe.cmd = SIOCGIWMODE;
if (network->capability & (WLAN_CAPABILITY_ESS | WLAN_CAPABILITY_IBSS)) {
if (network->capability & WLAN_CAPABILITY_ESS)
iwe.u.mode = IW_MODE_MASTER;
else
iwe.u.mode = IW_MODE_ADHOC;
start = iwe_stream_add_event(start, stop, &iwe, IW_EV_UINT_LEN);
}
/* Add frequency/channel */
iwe.cmd = SIOCGIWFREQ;
/* iwe.u.freq.m = ieee80211_frequency(network->channel, network->mode);
iwe.u.freq.e = 3; */
iwe.u.freq.m = network->channel;
iwe.u.freq.e = 0;
iwe.u.freq.i = 0;
start = iwe_stream_add_event(start, stop, &iwe, IW_EV_FREQ_LEN);
/* Add encryption capability */
iwe.cmd = SIOCGIWENCODE;
if (network->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;
start = iwe_stream_add_point(start, stop, &iwe, network->ssid);
/* Add basic and extended rates */
max_rate = 0;
p = custom;
p += snprintf(p, MAX_CUSTOM_LEN - (p - custom), " Rates (Mb/s): ");
for (i = 0, j = 0; i < network->rates_len;) {
if (j < network->rates_ex_len &&
((network->rates_ex[j] & 0x7F) <
(network->rates[i] & 0x7F)))
rate = network->rates_ex[j++] & 0x7F;
else
rate = network->rates[i++] & 0x7F;
if (rate > max_rate)
max_rate = rate;
p += snprintf(p, MAX_CUSTOM_LEN - (p - custom),
"%d%s ", rate >> 1, (rate & 1) ? ".5" : "");
}
for (; j < network->rates_ex_len; j++) {
rate = network->rates_ex[j] & 0x7F;
p += snprintf(p, MAX_CUSTOM_LEN - (p - custom),
"%d%s ", rate >> 1, (rate & 1) ? ".5" : "");
if (rate > max_rate)
max_rate = rate;
}
iwe.cmd = SIOCGIWRATE;
iwe.u.bitrate.fixed = iwe.u.bitrate.disabled = 0;
iwe.u.bitrate.value = max_rate * 500000;
start = iwe_stream_add_event(start, stop, &iwe, IW_EV_PARAM_LEN);
iwe.cmd = IWEVCUSTOM;
iwe.u.data.length = p - custom;
if (iwe.u.data.length)
start = iwe_stream_add_point(start, stop, &iwe, custom);
/* Add quality statistics */
iwe.cmd = IWEVQUAL;
iwe.u.qual.updated = IW_QUAL_QUAL_UPDATED | IW_QUAL_LEVEL_UPDATED |
IW_QUAL_NOISE_UPDATED;
if (!(network->stats.mask & IEEE80211_STATMASK_RSSI)) {
iwe.u.qual.updated |= IW_QUAL_QUAL_INVALID |
IW_QUAL_LEVEL_INVALID;
iwe.u.qual.qual = 0;
iwe.u.qual.level = 0;
} else {
iwe.u.qual.level = network->stats.rssi;
iwe.u.qual.qual =
(100 *
(ieee->perfect_rssi - ieee->worst_rssi) *
(ieee->perfect_rssi - ieee->worst_rssi) -
(ieee->perfect_rssi - network->stats.rssi) *
(15 * (ieee->perfect_rssi - ieee->worst_rssi) +
62 * (ieee->perfect_rssi - network->stats.rssi))) /
((ieee->perfect_rssi - ieee->worst_rssi) *
(ieee->perfect_rssi - ieee->worst_rssi));
if (iwe.u.qual.qual > 100)
iwe.u.qual.qual = 100;
else if (iwe.u.qual.qual < 1)
iwe.u.qual.qual = 0;
}
if (!(network->stats.mask & IEEE80211_STATMASK_NOISE)) {
iwe.u.qual.updated |= IW_QUAL_NOISE_INVALID;
iwe.u.qual.noise = 0;
} else {
iwe.u.qual.noise = network->stats.noise;
}
start = iwe_stream_add_event(start, stop, &iwe, IW_EV_QUAL_LEN);
iwe.cmd = IWEVCUSTOM;
p = custom;
iwe.u.data.length = p - custom;
if (iwe.u.data.length)
start = iwe_stream_add_point(start, stop, &iwe, custom);
if (network->wpa_ie_len) {
char buf[MAX_WPA_IE_LEN * 2 + 30];
u8 *p = buf;
p += sprintf(p, "wpa_ie=");
for (i = 0; i < network->wpa_ie_len; i++) {
p += sprintf(p, "%02x", network->wpa_ie[i]);
}
memset(&iwe, 0, sizeof(iwe));
iwe.cmd = IWEVCUSTOM;
iwe.u.data.length = strlen(buf);
start = iwe_stream_add_point(start, stop, &iwe, buf);
}
if (network->rsn_ie_len) {
char buf[MAX_WPA_IE_LEN * 2 + 30];
u8 *p = buf;
p += sprintf(p, "rsn_ie=");
for (i = 0; i < network->rsn_ie_len; i++) {
p += sprintf(p, "%02x", network->rsn_ie[i]);
}
memset(&iwe, 0, sizeof(iwe));
iwe.cmd = IWEVCUSTOM;
iwe.u.data.length = strlen(buf);
start = iwe_stream_add_point(start, stop, &iwe, buf);
}
/* Add EXTRA: Age to display seconds since last beacon/probe response
* for given network. */
iwe.cmd = IWEVCUSTOM;
p = custom;
p += snprintf(p, MAX_CUSTOM_LEN - (p - custom),
" Last beacon: %lums ago",
(jiffies - network->last_scanned) / (HZ / 100));
iwe.u.data.length = p - custom;
if (iwe.u.data.length)
start = iwe_stream_add_point(start, stop, &iwe, custom);
return start;
}
int ieee80211_wx_get_scan(struct ieee80211_device *ieee,
struct iw_request_info *info,
union iwreq_data *wrqu, char *extra)
{
struct ieee80211_network *network;
unsigned long flags;
char *ev = extra;
char *stop = ev + IW_SCAN_MAX_DATA;
int i = 0;
IEEE80211_DEBUG_WX("Getting scan\n");
spin_lock_irqsave(&ieee->lock, flags);
list_for_each_entry(network, &ieee->network_list, list) {
i++;
if (ieee->scan_age == 0 ||
time_after(network->last_scanned + ieee->scan_age, jiffies))
ev = ipw2100_translate_scan(ieee, ev, stop, network);
else
IEEE80211_DEBUG_SCAN("Not showing network '%s ("
MAC_FMT ")' due to age (%lums).\n",
escape_essid(network->ssid,
network->ssid_len),
MAC_ARG(network->bssid),
(jiffies -
network->last_scanned) / (HZ /
100));
}
spin_unlock_irqrestore(&ieee->lock, flags);
wrqu->data.length = ev - extra;
wrqu->data.flags = 0;
IEEE80211_DEBUG_WX("exit: %d networks returned.\n", i);
return 0;
}
int ieee80211_wx_set_encode(struct ieee80211_device *ieee,
struct iw_request_info *info,
union iwreq_data *wrqu, char *keybuf)
{
struct iw_point *erq = &(wrqu->encoding);
struct net_device *dev = ieee->dev;
struct ieee80211_security sec = {
.flags = 0
};
int i, key, key_provided, len;
struct ieee80211_crypt_data **crypt;
IEEE80211_DEBUG_WX("SET_ENCODE\n");
key = erq->flags & IW_ENCODE_INDEX;
if (key) {
if (key > WEP_KEYS)
return -EINVAL;
key--;
key_provided = 1;
} else {
key_provided = 0;
key = ieee->tx_keyidx;
}
IEEE80211_DEBUG_WX("Key: %d [%s]\n", key, key_provided ?
"provided" : "default");
crypt = &ieee->crypt[key];
if (erq->flags & IW_ENCODE_DISABLED) {
if (key_provided && *crypt) {
IEEE80211_DEBUG_WX("Disabling encryption on key %d.\n",
key);
ieee80211_crypt_delayed_deinit(ieee, crypt);
} else
IEEE80211_DEBUG_WX("Disabling encryption.\n");
/* Check all the keys to see if any are still configured,
* and if no key index was provided, de-init them all */
for (i = 0; i < WEP_KEYS; i++) {
if (ieee->crypt[i] != NULL) {
if (key_provided)
break;
ieee80211_crypt_delayed_deinit(ieee,
&ieee->crypt[i]);
}
}
if (i == WEP_KEYS) {
sec.enabled = 0;
sec.level = SEC_LEVEL_0;
sec.flags |= SEC_ENABLED | SEC_LEVEL;
}
goto done;
}
sec.enabled = 1;
sec.flags |= SEC_ENABLED;
if (*crypt != NULL && (*crypt)->ops != NULL &&
strcmp((*crypt)->ops->name, "WEP") != 0) {
/* changing to use WEP; deinit previously used algorithm
* on this key */
ieee80211_crypt_delayed_deinit(ieee, crypt);
}
if (*crypt == NULL) {
struct ieee80211_crypt_data *new_crypt;
/* take WEP into use */
new_crypt = kmalloc(sizeof(struct ieee80211_crypt_data),
GFP_KERNEL);
if (new_crypt == NULL)
return -ENOMEM;
memset(new_crypt, 0, sizeof(struct ieee80211_crypt_data));
new_crypt->ops = ieee80211_get_crypto_ops("WEP");
if (!new_crypt->ops) {
request_module("ieee80211_crypt_wep");
new_crypt->ops = ieee80211_get_crypto_ops("WEP");
}
if (new_crypt->ops && try_module_get(new_crypt->ops->owner))
new_crypt->priv = new_crypt->ops->init(ieee, key);
if (!new_crypt->ops || !new_crypt->priv) {
kfree(new_crypt);
new_crypt = NULL;
printk(KERN_WARNING "%s: could not initialize WEP: "
"load module ieee80211_crypt_wep\n", dev->name);
return -EOPNOTSUPP;
}
*crypt = new_crypt;
}
/* If a new key was provided, set it up */
if (erq->length > 0) {
len = erq->length <= 5 ? 5 : 13;
memcpy(sec.keys[key], keybuf, erq->length);
if (len > erq->length)
memset(sec.keys[key] + erq->length, 0,
len - erq->length);
IEEE80211_DEBUG_WX("Setting key %d to '%s' (%d:%d bytes)\n",
key, escape_essid(sec.keys[key], len),
erq->length, len);
sec.key_sizes[key] = len;
(*crypt)->ops->set_key(sec.keys[key], len, NULL,
(*crypt)->priv);
sec.flags |= (1 << key);
/* This ensures a key will be activated if no key is
* explicitely set */
if (key == sec.active_key)
sec.flags |= SEC_ACTIVE_KEY;
} else {
len = (*crypt)->ops->get_key(sec.keys[key], WEP_KEY_LEN,
NULL, (*crypt)->priv);
if (len == 0) {
/* Set a default key of all 0 */
IEEE80211_DEBUG_WX("Setting key %d to all zero.\n",
key);
memset(sec.keys[key], 0, 13);
(*crypt)->ops->set_key(sec.keys[key], 13, NULL,
(*crypt)->priv);
sec.key_sizes[key] = 13;
sec.flags |= (1 << key);
}
/* No key data - just set the default TX key index */
if (key_provided) {
IEEE80211_DEBUG_WX
("Setting key %d to default Tx key.\n", key);
ieee->tx_keyidx = key;
sec.active_key = key;
sec.flags |= SEC_ACTIVE_KEY;
}
}
done:
ieee->open_wep = !(erq->flags & IW_ENCODE_RESTRICTED);
sec.auth_mode = ieee->open_wep ? WLAN_AUTH_OPEN : WLAN_AUTH_SHARED_KEY;
sec.flags |= SEC_AUTH_MODE;
IEEE80211_DEBUG_WX("Auth: %s\n", sec.auth_mode == WLAN_AUTH_OPEN ?
"OPEN" : "SHARED KEY");
/* For now we just support WEP, so only set that security level...
* TODO: When WPA is added this is one place that needs to change */
sec.flags |= SEC_LEVEL;
sec.level = SEC_LEVEL_1; /* 40 and 104 bit WEP */
if (ieee->set_security)
ieee->set_security(dev, &sec);
/* Do not reset port if card is in Managed mode since resetting will
* generate new IEEE 802.11 authentication which may end up in looping
* with IEEE 802.1X. If your hardware requires a reset after WEP
* configuration (for example... Prism2), implement the reset_port in
* the callbacks structures used to initialize the 802.11 stack. */
if (ieee->reset_on_keychange &&
ieee->iw_mode != IW_MODE_INFRA &&
ieee->reset_port && ieee->reset_port(dev)) {
printk(KERN_DEBUG "%s: reset_port failed\n", dev->name);
return -EINVAL;
}
return 0;
}
int ieee80211_wx_get_encode(struct ieee80211_device *ieee,
struct iw_request_info *info,
union iwreq_data *wrqu, char *keybuf)
{
struct iw_point *erq = &(wrqu->encoding);
int len, key;
struct ieee80211_crypt_data *crypt;
IEEE80211_DEBUG_WX("GET_ENCODE\n");
key = erq->flags & IW_ENCODE_INDEX;
if (key) {
if (key > WEP_KEYS)
return -EINVAL;
key--;
} else
key = ieee->tx_keyidx;
crypt = ieee->crypt[key];
erq->flags = key + 1;
if (crypt == NULL || crypt->ops == NULL) {
erq->length = 0;
erq->flags |= IW_ENCODE_DISABLED;
return 0;
}
if (strcmp(crypt->ops->name, "WEP") != 0) {
/* only WEP is supported with wireless extensions, so just
* report that encryption is used */
erq->length = 0;
erq->flags |= IW_ENCODE_ENABLED;
return 0;
}
len = crypt->ops->get_key(keybuf, WEP_KEY_LEN, NULL, crypt->priv);
erq->length = (len >= 0 ? len : 0);
erq->flags |= IW_ENCODE_ENABLED;
if (ieee->open_wep)
erq->flags |= IW_ENCODE_OPEN;
else
erq->flags |= IW_ENCODE_RESTRICTED;
return 0;
}
EXPORT_SYMBOL(ieee80211_wx_get_scan);
EXPORT_SYMBOL(ieee80211_wx_set_encode);
EXPORT_SYMBOL(ieee80211_wx_get_encode);
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