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wifi: split WEXT handling out into its own file

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This commit is contained in:
Dan Williams 2011-09-29 16:27:17 -05:00
parent 7d0761588c
commit 02ecc5cbc4
7 changed files with 654 additions and 562 deletions
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2
include/wireless-helper.h
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@ -28,5 +28,5 @@
#include <linux/types.h>
#include <sys/socket.h>
#include <linux/if.h>
#include <wireless.h>
#include <linux/wireless.h>

3
src/Makefile.am
View file

@ -120,6 +120,9 @@ NetworkManager_SOURCES = \
nm-device-ethernet.h \
wifi-utils.c \
wifi-utils.h \
wifi-utils-private.h \
wifi-utils-wext.c \
wifi-utils-wext.h \
nm-device-wifi.c \
nm-device-wifi.h \
nm-device-olpc-mesh.c \

64
src/wifi-utils-private.h Normal file
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@ -0,0 +1,64 @@
/* -*- Mode: C; tab-width: 4; indent-tabs-mode: t; c-basic-offset: 4 -*- */
/* NetworkManager -- Network link manager
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* 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.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Copyright (C) 2011 Red Hat, Inc.
*/
#ifndef WIFI_UTILS_PRIVATE_H
#define WIFI_UTILS_PRIVATE_H
#include <glib.h>
#include "NetworkManager.h"
#include "wifi-utils.h"
struct WifiData {
char *iface;
int ifindex;
NMDeviceWifiCapabilities caps;
gboolean can_scan_ssid;
NM80211Mode (*get_mode) (WifiData *data);
gboolean (*set_mode) (WifiData *data, const NM80211Mode mode);
/* Return current frequency in MHz (really associated BSS frequency) */
guint32 (*get_freq) (WifiData *data);
/* Return first supported frequency in the zero-terminated list */
guint32 (*find_freq) (WifiData *data, const guint32 *freqs);
/* If SSID is empty/blank (zero-length or all \0s) return NULL */
GByteArray * (*get_ssid) (WifiData *data);
/* Return current bitrate in Kbps */
guint32 (*get_rate) (WifiData *data);
gboolean (*get_bssid) (WifiData *data, struct ether_addr *out_bssid);
/* Return a signal strength percentage 0 - 100% for the current BSSID;
* return -1 on errors or if not associated.
*/
int (*get_qual) (WifiData *data);
void (*deinit) (WifiData *data);
};
gpointer wifi_data_new (const char *iface, int ifindex, gsize len);
void wifi_data_free (WifiData *data);
#endif /* WIFI_UTILS_PRIVATE_H */

553
src/wifi-utils-wext.c Normal file
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@ -0,0 +1,553 @@
/* -*- Mode: C; tab-width: 4; indent-tabs-mode: t; c-basic-offset: 4 -*- */
/* NetworkManager -- Network link manager
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* 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.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Copyright (C) 2005 - 2011 Red Hat, Inc.
* Copyright (C) 2006 - 2008 Novell, Inc.
*/
#include <config.h>
#include <errno.h>
#include <string.h>
#include <sys/ioctl.h>
#include <net/ethernet.h>
#include <unistd.h>
#include <math.h>
#include <glib.h>
#include "wifi-utils-private.h"
#include "wifi-utils-wext.h"
#include "nm-logging.h"
#include "nm-utils.h"
#include "wireless-helper.h"
typedef struct {
WifiData parent;
int fd;
struct iw_quality max_qual;
gint8 num_freqs;
guint32 freqs[IW_MAX_FREQUENCIES];
} WifiDataWext;
/* Until a new wireless-tools comes out that has the defs and the structure,
* need to copy them here.
*/
/* Scan capability flags - in (struct iw_range *)->scan_capa */
#define NM_IW_SCAN_CAPA_NONE 0x00
#define NM_IW_SCAN_CAPA_ESSID 0x01
struct iw_range_with_scan_capa
{
guint32 throughput;
guint32 min_nwid;
guint32 max_nwid;
guint16 old_num_channels;
guint8 old_num_frequency;
guint8 scan_capa;
/* don't need the rest... */
};
static guint32
iw_freq_to_uint32 (struct iw_freq *freq)
{
if (freq->e == 0) {
/* Some drivers report channel not frequency. Convert to a
* frequency; but this assumes that the device is in b/g mode.
*/
if ((freq->m >= 1) && (freq->m <= 13))
return 2407 + (5 * freq->m);
else if (freq->m == 14)
return 2484;
}
return (guint32) (((double) freq->m) * pow (10, freq->e) / 1000000);
}
static void
wifi_wext_deinit (WifiData *parent)
{
WifiDataWext *wext = (WifiDataWext *) parent;
if (wext->fd >= 0)
close (wext->fd);
}
static NM80211Mode
wifi_wext_get_mode (WifiData *data)
{
WifiDataWext *wext = (WifiDataWext *) data;
struct iwreq wrq;
memset (&wrq, 0, sizeof (struct iwreq));
strncpy (wrq.ifr_name, wext->parent.iface, IFNAMSIZ);
if (ioctl (wext->fd, SIOCGIWMODE, &wrq) < 0) {
if (errno != ENODEV) {
nm_log_warn (LOGD_HW | LOGD_WIFI,
"(%s): error %d getting card mode",
wext->parent.iface, errno);
}
return NM_802_11_MODE_UNKNOWN;
}
switch (wrq.u.mode) {
case IW_MODE_ADHOC:
return NM_802_11_MODE_ADHOC;
case IW_MODE_INFRA:
return NM_802_11_MODE_INFRA;
default:
break;
}
return NM_802_11_MODE_UNKNOWN;
}
static gboolean
wifi_wext_set_mode (WifiData *data, const NM80211Mode mode)
{
WifiDataWext *wext = (WifiDataWext *) data;
struct iwreq wrq;
if (wifi_wext_get_mode (data) == mode)
return TRUE;
memset (&wrq, 0, sizeof (struct iwreq));
switch (mode) {
case NM_802_11_MODE_ADHOC:
wrq.u.mode = IW_MODE_ADHOC;
break;
case NM_802_11_MODE_INFRA:
wrq.u.mode = IW_MODE_INFRA;
break;
default:
g_warn_if_reached ();
return FALSE;
}
strncpy (wrq.ifr_name, wext->parent.iface, IFNAMSIZ);
if (ioctl (wext->fd, SIOCSIWMODE, &wrq) < 0) {
if (errno != ENODEV) {
nm_log_err (LOGD_HW | LOGD_WIFI, "(%s): error setting mode %d",
wext->parent.iface, mode);
}
return FALSE;
}
return TRUE;
}
static guint32
wifi_wext_get_freq (WifiData *data)
{
WifiDataWext *wext = (WifiDataWext *) data;
struct iwreq wrq;
memset (&wrq, 0, sizeof (struct iwreq));
strncpy (wrq.ifr_name, wext->parent.iface, IFNAMSIZ);
if (ioctl (wext->fd, SIOCGIWFREQ, &wrq) < 0) {
nm_log_warn (LOGD_HW | LOGD_WIFI,
"(%s): error getting frequency: %s",
wext->parent.iface, strerror (errno));
return 0;
}
return iw_freq_to_uint32 (&wrq.u.freq);
}
static guint32
wifi_wext_find_freq (WifiData *data, const guint32 *freqs)
{
WifiDataWext *wext = (WifiDataWext *) data;
int i;
for (i = 0; i < wext->num_freqs; i++) {
while (*freqs) {
if (wext->freqs[i] == *freqs)
return *freqs;
freqs++;
}
}
return 0;
}
static GByteArray *
wifi_wext_get_ssid (WifiData *data)
{
WifiDataWext *wext = (WifiDataWext *) data;
struct iwreq wrq;
char ssid[IW_ESSID_MAX_SIZE + 2];
guint32 len;
GByteArray *array = NULL;
memset (ssid, 0, sizeof (ssid));
wrq.u.essid.pointer = (caddr_t) &ssid;
wrq.u.essid.length = sizeof (ssid);
wrq.u.essid.flags = 0;
strncpy (wrq.ifr_name, wext->parent.iface, IFNAMSIZ);
if (ioctl (wext->fd, SIOCGIWESSID, &wrq) < 0) {
nm_log_err (LOGD_HW | LOGD_WIFI, "(%s): couldn't get SSID: %d",
wext->parent.iface, errno);
return NULL;
}
len = wrq.u.essid.length;
if (nm_utils_is_empty_ssid ((guint8 *) ssid, len) == FALSE) {
array = g_byte_array_sized_new (len);
g_byte_array_append (array, (const guint8 *) ssid, len);
}
return array;
}
static gboolean
wifi_wext_get_bssid (WifiData *data, struct ether_addr *out_bssid)
{
WifiDataWext *wext = (WifiDataWext *) data;
struct iwreq wrq;
memset (&wrq, 0, sizeof (wrq));
strncpy (wrq.ifr_name, wext->parent.iface, IFNAMSIZ);
if (ioctl (wext->fd, SIOCGIWAP, &wrq) < 0) {
nm_log_warn (LOGD_HW | LOGD_WIFI,
"(%s): error getting associated BSSID: %s",
wext->parent.iface, strerror (errno));
return FALSE;
}
memcpy (out_bssid->ether_addr_octet, &(wrq.u.ap_addr.sa_data), ETH_ALEN);
return TRUE;
}
static guint32
wifi_wext_get_rate (WifiData *data)
{
WifiDataWext *wext = (WifiDataWext *) data;
struct iwreq wrq;
int err;
memset (&wrq, 0, sizeof (wrq));
strncpy (wrq.ifr_name, wext->parent.iface, IFNAMSIZ);
err = ioctl (wext->fd, SIOCGIWRATE, &wrq);
return ((err == 0) ? wrq.u.bitrate.value / 1000 : 0);
}
static int
wext_qual_to_percent (const struct iw_quality *qual,
const struct iw_quality *max_qual)
{
int percent = -1;
int level_percent = -1;
g_return_val_if_fail (qual != NULL, -1);
g_return_val_if_fail (max_qual != NULL, -1);
/* Magically convert the many different WEXT quality representations to a percentage */
nm_log_dbg (LOGD_WIFI,
"QL: qual %d/%u/0x%X, level %d/%u/0x%X, noise %d/%u/0x%X, updated: 0x%X ** MAX: qual %d/%u/0x%X, level %d/%u/0x%X, noise %d/%u/0x%X, updated: 0x%X",
(__s8) qual->qual, qual->qual, qual->qual,
(__s8) qual->level, qual->level, qual->level,
(__s8) qual->noise, qual->noise, qual->noise,
qual->updated,
(__s8) max_qual->qual, max_qual->qual, max_qual->qual,
(__s8) max_qual->level, max_qual->level, max_qual->level,
(__s8) max_qual->noise, max_qual->noise, max_qual->noise,
max_qual->updated);
/* Try using the card's idea of the signal quality first as long as it tells us what the max quality is.
* Drivers that fill in quality values MUST treat them as percentages, ie the "Link Quality" MUST be
* bounded by 0 and max_qual->qual, and MUST change in a linear fashion. Within those bounds, drivers
* are free to use whatever they want to calculate "Link Quality".
*/
if ((max_qual->qual != 0) && !(max_qual->updated & IW_QUAL_QUAL_INVALID) && !(qual->updated & IW_QUAL_QUAL_INVALID))
percent = (int)(100 * ((double)qual->qual / (double)max_qual->qual));
/* If the driver doesn't specify a complete and valid quality, we have two options:
*
* 1) dBm: driver must specify max_qual->level = 0, and have valid values for
* qual->level and (qual->noise OR max_qual->noise)
* 2) raw RSSI: driver must specify max_qual->level > 0, and have valid values for
* qual->level and max_qual->level
*
* This is the WEXT spec. If this interpretation is wrong, I'll fix it. Otherwise,
* If drivers don't conform to it, they are wrong and need to be fixed.
*/
if ( (max_qual->level == 0) && !(max_qual->updated & IW_QUAL_LEVEL_INVALID) /* Valid max_qual->level == 0 */
&& !(qual->updated & IW_QUAL_LEVEL_INVALID) /* Must have valid qual->level */
&& ( ((max_qual->noise > 0) && !(max_qual->updated & IW_QUAL_NOISE_INVALID)) /* Must have valid max_qual->noise */
|| ((qual->noise > 0) && !(qual->updated & IW_QUAL_NOISE_INVALID))) /* OR valid qual->noise */
) {
/* Absolute power values (dBm) */
/* Reasonable fallbacks for dumb drivers that don't specify either level. */
#define FALLBACK_NOISE_FLOOR_DBM -90
#define FALLBACK_SIGNAL_MAX_DBM -20
int max_level = FALLBACK_SIGNAL_MAX_DBM;
int noise = FALLBACK_NOISE_FLOOR_DBM;
int level = qual->level - 0x100;
level = CLAMP (level, FALLBACK_NOISE_FLOOR_DBM, FALLBACK_SIGNAL_MAX_DBM);
if ((qual->noise > 0) && !(qual->updated & IW_QUAL_NOISE_INVALID))
noise = qual->noise - 0x100;
else if ((max_qual->noise > 0) && !(max_qual->updated & IW_QUAL_NOISE_INVALID))
noise = max_qual->noise - 0x100;
noise = CLAMP (noise, FALLBACK_NOISE_FLOOR_DBM, FALLBACK_SIGNAL_MAX_DBM);
/* A sort of signal-to-noise ratio calculation */
level_percent = (int)(100 - 70 *(
((double)max_level - (double)level) /
((double)max_level - (double)noise)));
nm_log_dbg (LOGD_WIFI, "QL1: level_percent is %d. max_level %d, level %d, noise_floor %d.",
level_percent, max_level, level, noise);
} else if ( (max_qual->level != 0)
&& !(max_qual->updated & IW_QUAL_LEVEL_INVALID) /* Valid max_qual->level as upper bound */
&& !(qual->updated & IW_QUAL_LEVEL_INVALID)) {
/* Relative power values (RSSI) */
int level = qual->level;
/* Signal level is relavtive (0 -> max_qual->level) */
level = CLAMP (level, 0, max_qual->level);
level_percent = (int)(100 * ((double)level / (double)max_qual->level));
nm_log_dbg (LOGD_WIFI, "QL2: level_percent is %d. max_level %d, level %d.",
level_percent, max_qual->level, level);
} else if (percent == -1) {
nm_log_dbg (LOGD_WIFI, "QL: Could not get quality %% value from driver. Driver is probably buggy.");
}
/* If the quality percent was 0 or doesn't exist, then try to use signal levels instead */
if ((percent < 1) && (level_percent >= 0))
percent = level_percent;
nm_log_dbg (LOGD_WIFI, "QL: Final quality percent is %d (%d).",
percent, CLAMP (percent, 0, 100));
return (CLAMP (percent, 0, 100));
}
static int
wifi_wext_get_qual (WifiData *data)
{
WifiDataWext *wext = (WifiDataWext *) data;
struct iwreq wrq;
struct iw_statistics stats;
memset (&stats, 0, sizeof (stats));
wrq.u.data.pointer = &stats;
wrq.u.data.length = sizeof (stats);
wrq.u.data.flags = 1; /* Clear updated flag */
strncpy (wrq.ifr_name, wext->parent.iface, IFNAMSIZ);
if (ioctl (wext->fd, SIOCGIWSTATS, &wrq) < 0) {
nm_log_warn (LOGD_HW | LOGD_WIFI,
"(%s): error getting signal strength: %s",
wext->parent.iface, strerror (errno));
return -1;
}
return wext_qual_to_percent (&stats.qual, &wext->max_qual);
}
static gboolean
wext_can_scan (WifiDataWext *wext)
{
struct iwreq wrq;
memset (&wrq, 0, sizeof (struct iwreq));
strncpy (wrq.ifr_name, wext->parent.iface, IFNAMSIZ);
if (ioctl (wext->fd, SIOCSIWSCAN, &wrq) < 0) {
if (errno == EOPNOTSUPP)
return FALSE;
}
return TRUE;
}
static gboolean
wext_get_range (WifiDataWext *wext,
struct iw_range *range,
guint32 *response_len)
{
int i = 26;
gboolean success = FALSE;
struct iwreq wrq;
memset (&wrq, 0, sizeof (struct iwreq));
strncpy (wrq.ifr_name, wext->parent.iface, IFNAMSIZ);
wrq.u.data.pointer = (caddr_t) range;
wrq.u.data.length = sizeof (struct iw_range);
/* Need to give some drivers time to recover after suspend/resume
* (ex ipw3945 takes a few seconds to talk to its regulatory daemon;
* see rh bz#362421)
*/
while (i-- > 0) {
if (ioctl (wext->fd, SIOCGIWRANGE, &wrq) == 0) {
if (response_len)
*response_len = wrq.u.data.length;
success = TRUE;
break;
} else if (errno != EAGAIN) {
nm_log_err (LOGD_HW | LOGD_WIFI,
"(%s): couldn't get driver range information (%d).",
wext->parent.iface, errno);
break;
}
g_usleep (G_USEC_PER_SEC / 4);
}
if (i <= 0) {
nm_log_warn (LOGD_HW | LOGD_WIFI,
"(%s): driver took too long to respond to IWRANGE query.",
wext->parent.iface);
}
return success;
}
#define WPA_CAPS (NM_WIFI_DEVICE_CAP_CIPHER_TKIP | \
NM_WIFI_DEVICE_CAP_CIPHER_CCMP | \
NM_WIFI_DEVICE_CAP_WPA | \
NM_WIFI_DEVICE_CAP_RSN)
static guint32
wext_get_caps (WifiDataWext *wext, struct iw_range *range)
{
guint32 caps = NM_WIFI_DEVICE_CAP_NONE;
g_return_val_if_fail (wext != NULL, NM_WIFI_DEVICE_CAP_NONE);
g_return_val_if_fail (range != NULL, NM_WIFI_DEVICE_CAP_NONE);
/* All drivers should support WEP by default */
caps |= NM_WIFI_DEVICE_CAP_CIPHER_WEP40 | NM_WIFI_DEVICE_CAP_CIPHER_WEP104;
if (range->enc_capa & IW_ENC_CAPA_CIPHER_TKIP)
caps |= NM_WIFI_DEVICE_CAP_CIPHER_TKIP;
if (range->enc_capa & IW_ENC_CAPA_CIPHER_CCMP)
caps |= NM_WIFI_DEVICE_CAP_CIPHER_CCMP;
if (range->enc_capa & IW_ENC_CAPA_WPA)
caps |= NM_WIFI_DEVICE_CAP_WPA;
if (range->enc_capa & IW_ENC_CAPA_WPA2)
caps |= NM_WIFI_DEVICE_CAP_RSN;
/* Check for cipher support but not WPA support */
if ( (caps & (NM_WIFI_DEVICE_CAP_CIPHER_TKIP | NM_WIFI_DEVICE_CAP_CIPHER_CCMP))
&& !(caps & (NM_WIFI_DEVICE_CAP_WPA | NM_WIFI_DEVICE_CAP_RSN))) {
nm_log_warn (LOGD_WIFI, "%s: device supports WPA ciphers but not WPA protocol; "
"WPA unavailable.", wext->parent.iface);
caps &= ~WPA_CAPS;
}
/* Check for WPA support but not cipher support */
if ( (caps & (NM_WIFI_DEVICE_CAP_WPA | NM_WIFI_DEVICE_CAP_RSN))
&& !(caps & (NM_WIFI_DEVICE_CAP_CIPHER_TKIP | NM_WIFI_DEVICE_CAP_CIPHER_CCMP))) {
nm_log_warn (LOGD_WIFI, "%s: device supports WPA protocol but not WPA ciphers; "
"WPA unavailable.", wext->parent.iface);
caps &= ~WPA_CAPS;
}
return caps;
}
WifiData *
wifi_wext_init (const char *iface, int ifindex)
{
WifiDataWext *wext;
struct iw_range range;
guint32 response_len = 0;
struct iw_range_with_scan_capa *scan_capa_range;
int i;
wext = wifi_data_new (iface, ifindex, sizeof (*wext));
wext->parent.get_mode = wifi_wext_get_mode;
wext->parent.set_mode = wifi_wext_set_mode;
wext->parent.get_freq = wifi_wext_get_freq;
wext->parent.find_freq = wifi_wext_find_freq;
wext->parent.get_ssid = wifi_wext_get_ssid;
wext->parent.get_bssid = wifi_wext_get_bssid;
wext->parent.get_rate = wifi_wext_get_rate;
wext->parent.get_qual = wifi_wext_get_qual;
wext->parent.deinit = wifi_wext_deinit;
wext->fd = socket (PF_INET, SOCK_DGRAM, 0);
if (wext->fd < 0)
goto error;
memset (&range, 0, sizeof (struct iw_range));
if (wext_get_range (wext, &range, &response_len) == FALSE) {
nm_log_info (LOGD_HW | LOGD_WIFI, "(%s): driver WEXT range request failed",
wext->parent.iface);
goto error;
}
if ((response_len < 300) || (range.we_version_compiled < 21)) {
nm_log_info (LOGD_HW | LOGD_WIFI,
"(%s): driver WEXT version too old (got %d, expected >= 21)",
wext->parent.iface,
range.we_version_compiled);
goto error;
}
wext->max_qual.qual = range.max_qual.qual;
wext->max_qual.level = range.max_qual.level;
wext->max_qual.noise = range.max_qual.noise;
wext->max_qual.updated = range.max_qual.updated;
wext->num_freqs = MIN (range.num_frequency, IW_MAX_FREQUENCIES);
for (i = 0; i < wext->num_freqs; i++)
wext->freqs[i] = iw_freq_to_uint32 (&range.freq[i]);
/* Check for scanning capability; cards that can't scan are not supported */
if (wext_can_scan (wext) == FALSE) {
nm_log_info (LOGD_HW | LOGD_WIFI,
"(%s): drivers that cannot scan are unsupported",
wext->parent.iface);
goto error;
}
/* Check for the ability to scan specific SSIDs. Until the scan_capa
* field gets added to wireless-tools, need to work around that by casting
* to the custom structure.
*/
scan_capa_range = (struct iw_range_with_scan_capa *) &range;
if (scan_capa_range->scan_capa & NM_IW_SCAN_CAPA_ESSID) {
wext->parent.can_scan_ssid = TRUE;
nm_log_info (LOGD_HW | LOGD_WIFI,
"(%s): driver supports SSID scans (scan_capa 0x%02X).",
wext->parent.iface,
scan_capa_range->scan_capa);
} else {
nm_log_info (LOGD_HW | LOGD_WIFI,
"(%s): driver does not support SSID scans (scan_capa 0x%02X).",
wext->parent.iface,
scan_capa_range->scan_capa);
}
wext->parent.caps = wext_get_caps (wext, &range);
return (WifiData *) wext;
error:
wifi_utils_deinit ((WifiData *) wext);
return NULL;
}

28
src/wifi-utils-wext.h Normal file
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@ -0,0 +1,28 @@
/* -*- Mode: C; tab-width: 4; indent-tabs-mode: t; c-basic-offset: 4 -*- */
/* NetworkManager -- Network link manager
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* 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.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Copyright (C) 2011 Red Hat, Inc.
*/
#ifndef WIFI_UTILS_WEXT_H
#define WIFI_UTILS_WEXT_H
#include "wifi-utils.h"
WifiData *wifi_wext_init (const char *iface, int ifindex);
#endif /* WIFI_UTILS_WEXT_H */

565
src/wifi-utils.c
View file

@ -20,52 +20,14 @@
*/
#include <config.h>
#include <errno.h>
#include <string.h>
#include <sys/ioctl.h>
#include <net/ethernet.h>
#include <unistd.h>
#include <math.h>
#include <glib.h>
#include "wifi-utils.h"
#include "nm-logging.h"
#include "nm-utils.h"
#include "wifi-utils-private.h"
#include "wifi-utils-wext.h"
struct WifiData {
char *iface;
int ifindex;
NMDeviceWifiCapabilities caps;
gboolean can_scan_ssid;
NM80211Mode (*get_mode) (WifiData *data);
gboolean (*set_mode) (WifiData *data, const NM80211Mode mode);
/* Return current frequency in MHz (really associated BSS frequency) */
guint32 (*get_freq) (WifiData *data);
/* Return first supported frequency in the zero-terminated list */
guint32 (*find_freq) (WifiData *data, const guint32 *freqs);
/* If SSID is empty/blank (zero-length or all \0s) return NULL */
GByteArray * (*get_ssid) (WifiData *data);
/* Return current bitrate in Kbps */
guint32 (*get_rate) (WifiData *data);
gboolean (*get_bssid) (WifiData *data, struct ether_addr *out_bssid);
/* Return a signal strength percentage 0 - 100% for the current BSSID;
* return -1 on errors or if not associated.
*/
int (*get_qual) (WifiData *data);
void (*deinit) (WifiData *data);
};
static gpointer
gpointer
wifi_data_new (const char *iface, int ifindex, gsize len)
{
WifiData *data;
@ -76,7 +38,7 @@ wifi_data_new (const char *iface, int ifindex, gsize len)
return data;
}
static void
void
wifi_data_free (WifiData *data)
{
g_free (data->iface);
@ -86,525 +48,6 @@ wifi_data_free (WifiData *data)
/***************************************************************/
#include <linux/wireless.h>
typedef struct {
WifiData parent;
int fd;
struct iw_quality max_qual;
gint8 num_freqs;
guint32 freqs[IW_MAX_FREQUENCIES];
} WifiDataWext;
/* Until a new wireless-tools comes out that has the defs and the structure,
* need to copy them here.
*/
/* Scan capability flags - in (struct iw_range *)->scan_capa */
#define NM_IW_SCAN_CAPA_NONE 0x00
#define NM_IW_SCAN_CAPA_ESSID 0x01
struct iw_range_with_scan_capa
{
guint32 throughput;
guint32 min_nwid;
guint32 max_nwid;
guint16 old_num_channels;
guint8 old_num_frequency;
guint8 scan_capa;
/* don't need the rest... */
};
static guint32
iw_freq_to_uint32 (struct iw_freq *freq)
{
if (freq->e == 0) {
/* Some drivers report channel not frequency. Convert to a
* frequency; but this assumes that the device is in b/g mode.
*/
if ((freq->m >= 1) && (freq->m <= 13))
return 2407 + (5 * freq->m);
else if (freq->m == 14)
return 2484;
}
return (guint32) (((double) freq->m) * pow (10, freq->e) / 1000000);
}
static void
wifi_wext_deinit (WifiData *parent)
{
WifiDataWext *wext = (WifiDataWext *) parent;
if (wext->fd >= 0)
close (wext->fd);
}
static NM80211Mode
wifi_wext_get_mode (WifiData *data)
{
WifiDataWext *wext = (WifiDataWext *) data;
struct iwreq wrq;
memset (&wrq, 0, sizeof (struct iwreq));
strncpy (wrq.ifr_name, wext->parent.iface, IFNAMSIZ);
if (ioctl (wext->fd, SIOCGIWMODE, &wrq) < 0) {
if (errno != ENODEV) {
nm_log_warn (LOGD_HW | LOGD_WIFI,
"(%s): error %d getting card mode",
wext->parent.iface, errno);
}
return NM_802_11_MODE_UNKNOWN;
}
switch (wrq.u.mode) {
case IW_MODE_ADHOC:
return NM_802_11_MODE_ADHOC;
case IW_MODE_INFRA:
return NM_802_11_MODE_INFRA;
default:
break;
}
return NM_802_11_MODE_UNKNOWN;
}
static gboolean
wifi_wext_set_mode (WifiData *data, const NM80211Mode mode)
{
WifiDataWext *wext = (WifiDataWext *) data;
struct iwreq wrq;
if (wifi_wext_get_mode (data) == mode)
return TRUE;
memset (&wrq, 0, sizeof (struct iwreq));
switch (mode) {
case NM_802_11_MODE_ADHOC:
wrq.u.mode = IW_MODE_ADHOC;
break;
case NM_802_11_MODE_INFRA:
wrq.u.mode = IW_MODE_INFRA;
break;
default:
g_warn_if_reached ();
return FALSE;
}
strncpy (wrq.ifr_name, wext->parent.iface, IFNAMSIZ);
if (ioctl (wext->fd, SIOCSIWMODE, &wrq) < 0) {
if (errno != ENODEV) {
nm_log_err (LOGD_HW | LOGD_WIFI, "(%s): error setting mode %d",
wext->parent.iface, mode);
}
return FALSE;
}
return TRUE;
}
static guint32
wifi_wext_get_freq (WifiData *data)
{
WifiDataWext *wext = (WifiDataWext *) data;
struct iwreq wrq;
memset (&wrq, 0, sizeof (struct iwreq));
strncpy (wrq.ifr_name, wext->parent.iface, IFNAMSIZ);
if (ioctl (wext->fd, SIOCGIWFREQ, &wrq) < 0) {
nm_log_warn (LOGD_HW | LOGD_WIFI,
"(%s): error getting frequency: %s",
wext->parent.iface, strerror (errno));
return 0;
}
return iw_freq_to_uint32 (&wrq.u.freq);
}
static guint32
wifi_wext_find_freq (WifiData *data, const guint32 *freqs)
{
WifiDataWext *wext = (WifiDataWext *) data;
int i;
for (i = 0; i < wext->num_freqs; i++) {
while (*freqs) {
if (wext->freqs[i] == *freqs)
return *freqs;
freqs++;
}
}
return 0;
}
static GByteArray *
wifi_wext_get_ssid (WifiData *data)
{
WifiDataWext *wext = (WifiDataWext *) data;
struct iwreq wrq;
char ssid[IW_ESSID_MAX_SIZE + 2];
guint32 len;
GByteArray *array = NULL;
memset (ssid, 0, sizeof (ssid));
wrq.u.essid.pointer = (caddr_t) &ssid;
wrq.u.essid.length = sizeof (ssid);
wrq.u.essid.flags = 0;
strncpy (wrq.ifr_name, wext->parent.iface, IFNAMSIZ);
if (ioctl (wext->fd, SIOCGIWESSID, &wrq) < 0) {
nm_log_err (LOGD_HW | LOGD_WIFI, "(%s): couldn't get SSID: %d",
wext->parent.iface, errno);
return NULL;
}
len = wrq.u.essid.length;
if (nm_utils_is_empty_ssid ((guint8 *) ssid, len) == FALSE) {
array = g_byte_array_sized_new (len);
g_byte_array_append (array, (const guint8 *) ssid, len);
}
return array;
}
static gboolean
wifi_wext_get_bssid (WifiData *data, struct ether_addr *out_bssid)
{
WifiDataWext *wext = (WifiDataWext *) data;
struct iwreq wrq;
memset (&wrq, 0, sizeof (wrq));
strncpy (wrq.ifr_name, wext->parent.iface, IFNAMSIZ);
if (ioctl (wext->fd, SIOCGIWAP, &wrq) < 0) {
nm_log_warn (LOGD_HW | LOGD_WIFI,
"(%s): error getting associated BSSID: %s",
wext->parent.iface, strerror (errno));
return FALSE;
}
memcpy (out_bssid->ether_addr_octet, &(wrq.u.ap_addr.sa_data), ETH_ALEN);
return TRUE;
}
static guint32
wifi_wext_get_rate (WifiData *data)
{
WifiDataWext *wext = (WifiDataWext *) data;
struct iwreq wrq;
int err;
memset (&wrq, 0, sizeof (wrq));
strncpy (wrq.ifr_name, wext->parent.iface, IFNAMSIZ);
err = ioctl (wext->fd, SIOCGIWRATE, &wrq);
return ((err == 0) ? wrq.u.bitrate.value / 1000 : 0);
}
static int
wext_qual_to_percent (const struct iw_quality *qual,
const struct iw_quality *max_qual)
{
int percent = -1;
int level_percent = -1;
g_return_val_if_fail (qual != NULL, -1);
g_return_val_if_fail (max_qual != NULL, -1);
/* Magically convert the many different WEXT quality representations to a percentage */
nm_log_dbg (LOGD_WIFI,
"QL: qual %d/%u/0x%X, level %d/%u/0x%X, noise %d/%u/0x%X, updated: 0x%X ** MAX: qual %d/%u/0x%X, level %d/%u/0x%X, noise %d/%u/0x%X, updated: 0x%X",
(__s8) qual->qual, qual->qual, qual->qual,
(__s8) qual->level, qual->level, qual->level,
(__s8) qual->noise, qual->noise, qual->noise,
qual->updated,
(__s8) max_qual->qual, max_qual->qual, max_qual->qual,
(__s8) max_qual->level, max_qual->level, max_qual->level,
(__s8) max_qual->noise, max_qual->noise, max_qual->noise,
max_qual->updated);
/* Try using the card's idea of the signal quality first as long as it tells us what the max quality is.
* Drivers that fill in quality values MUST treat them as percentages, ie the "Link Quality" MUST be
* bounded by 0 and max_qual->qual, and MUST change in a linear fashion. Within those bounds, drivers
* are free to use whatever they want to calculate "Link Quality".
*/
if ((max_qual->qual != 0) && !(max_qual->updated & IW_QUAL_QUAL_INVALID) && !(qual->updated & IW_QUAL_QUAL_INVALID))
percent = (int)(100 * ((double)qual->qual / (double)max_qual->qual));
/* If the driver doesn't specify a complete and valid quality, we have two options:
*
* 1) dBm: driver must specify max_qual->level = 0, and have valid values for
* qual->level and (qual->noise OR max_qual->noise)
* 2) raw RSSI: driver must specify max_qual->level > 0, and have valid values for
* qual->level and max_qual->level
*
* This is the WEXT spec. If this interpretation is wrong, I'll fix it. Otherwise,
* If drivers don't conform to it, they are wrong and need to be fixed.
*/
if ( (max_qual->level == 0) && !(max_qual->updated & IW_QUAL_LEVEL_INVALID) /* Valid max_qual->level == 0 */
&& !(qual->updated & IW_QUAL_LEVEL_INVALID) /* Must have valid qual->level */
&& ( ((max_qual->noise > 0) && !(max_qual->updated & IW_QUAL_NOISE_INVALID)) /* Must have valid max_qual->noise */
|| ((qual->noise > 0) && !(qual->updated & IW_QUAL_NOISE_INVALID))) /* OR valid qual->noise */
) {
/* Absolute power values (dBm) */
/* Reasonable fallbacks for dumb drivers that don't specify either level. */
#define FALLBACK_NOISE_FLOOR_DBM -90
#define FALLBACK_SIGNAL_MAX_DBM -20
int max_level = FALLBACK_SIGNAL_MAX_DBM;
int noise = FALLBACK_NOISE_FLOOR_DBM;
int level = qual->level - 0x100;
level = CLAMP (level, FALLBACK_NOISE_FLOOR_DBM, FALLBACK_SIGNAL_MAX_DBM);
if ((qual->noise > 0) && !(qual->updated & IW_QUAL_NOISE_INVALID))
noise = qual->noise - 0x100;
else if ((max_qual->noise > 0) && !(max_qual->updated & IW_QUAL_NOISE_INVALID))
noise = max_qual->noise - 0x100;
noise = CLAMP (noise, FALLBACK_NOISE_FLOOR_DBM, FALLBACK_SIGNAL_MAX_DBM);
/* A sort of signal-to-noise ratio calculation */
level_percent = (int)(100 - 70 *(
((double)max_level - (double)level) /
((double)max_level - (double)noise)));
nm_log_dbg (LOGD_WIFI, "QL1: level_percent is %d. max_level %d, level %d, noise_floor %d.",
level_percent, max_level, level, noise);
} else if ( (max_qual->level != 0)
&& !(max_qual->updated & IW_QUAL_LEVEL_INVALID) /* Valid max_qual->level as upper bound */
&& !(qual->updated & IW_QUAL_LEVEL_INVALID)) {
/* Relative power values (RSSI) */
int level = qual->level;
/* Signal level is relavtive (0 -> max_qual->level) */
level = CLAMP (level, 0, max_qual->level);
level_percent = (int)(100 * ((double)level / (double)max_qual->level));
nm_log_dbg (LOGD_WIFI, "QL2: level_percent is %d. max_level %d, level %d.",
level_percent, max_qual->level, level);
} else if (percent == -1) {
nm_log_dbg (LOGD_WIFI, "QL: Could not get quality %% value from driver. Driver is probably buggy.");
}
/* If the quality percent was 0 or doesn't exist, then try to use signal levels instead */
if ((percent < 1) && (level_percent >= 0))
percent = level_percent;
nm_log_dbg (LOGD_WIFI, "QL: Final quality percent is %d (%d).",
percent, CLAMP (percent, 0, 100));
return (CLAMP (percent, 0, 100));
}
static int
wifi_wext_get_qual (WifiData *data)
{
WifiDataWext *wext = (WifiDataWext *) data;
struct iwreq wrq;
struct iw_statistics stats;
memset (&stats, 0, sizeof (stats));
wrq.u.data.pointer = &stats;
wrq.u.data.length = sizeof (stats);
wrq.u.data.flags = 1; /* Clear updated flag */
strncpy (wrq.ifr_name, wext->parent.iface, IFNAMSIZ);
if (ioctl (wext->fd, SIOCGIWSTATS, &wrq) < 0) {
nm_log_warn (LOGD_HW | LOGD_WIFI,
"(%s): error getting signal strength: %s",
wext->parent.iface, strerror (errno));
return -1;
}
return wext_qual_to_percent (&stats.qual, &wext->max_qual);
}
static gboolean
wext_can_scan (WifiDataWext *wext)
{
struct iwreq wrq;
memset (&wrq, 0, sizeof (struct iwreq));
strncpy (wrq.ifr_name, wext->parent.iface, IFNAMSIZ);
if (ioctl (wext->fd, SIOCSIWSCAN, &wrq) < 0) {
if (errno == EOPNOTSUPP)
return FALSE;
}
return TRUE;
}
static gboolean
wext_get_range (WifiDataWext *wext,
struct iw_range *range,
guint32 *response_len)
{
int i = 26;
gboolean success = FALSE;
struct iwreq wrq;
memset (&wrq, 0, sizeof (struct iwreq));
strncpy (wrq.ifr_name, wext->parent.iface, IFNAMSIZ);
wrq.u.data.pointer = (caddr_t) range;
wrq.u.data.length = sizeof (struct iw_range);
/* Need to give some drivers time to recover after suspend/resume
* (ex ipw3945 takes a few seconds to talk to its regulatory daemon;
* see rh bz#362421)
*/
while (i-- > 0) {
if (ioctl (wext->fd, SIOCGIWRANGE, &wrq) == 0) {
if (response_len)
*response_len = wrq.u.data.length;
success = TRUE;
break;
} else if (errno != EAGAIN) {
nm_log_err (LOGD_HW | LOGD_WIFI,
"(%s): couldn't get driver range information (%d).",
wext->parent.iface, errno);
break;
}
g_usleep (G_USEC_PER_SEC / 4);
}
if (i <= 0) {
nm_log_warn (LOGD_HW | LOGD_WIFI,
"(%s): driver took too long to respond to IWRANGE query.",
wext->parent.iface);
}
return success;
}
#define WPA_CAPS (NM_WIFI_DEVICE_CAP_CIPHER_TKIP | \
NM_WIFI_DEVICE_CAP_CIPHER_CCMP | \
NM_WIFI_DEVICE_CAP_WPA | \
NM_WIFI_DEVICE_CAP_RSN)
static guint32
wext_get_caps (WifiDataWext *wext, struct iw_range *range)
{
guint32 caps = NM_WIFI_DEVICE_CAP_NONE;
g_return_val_if_fail (wext != NULL, NM_WIFI_DEVICE_CAP_NONE);
g_return_val_if_fail (range != NULL, NM_WIFI_DEVICE_CAP_NONE);
/* All drivers should support WEP by default */
caps |= NM_WIFI_DEVICE_CAP_CIPHER_WEP40 | NM_WIFI_DEVICE_CAP_CIPHER_WEP104;
if (range->enc_capa & IW_ENC_CAPA_CIPHER_TKIP)
caps |= NM_WIFI_DEVICE_CAP_CIPHER_TKIP;
if (range->enc_capa & IW_ENC_CAPA_CIPHER_CCMP)
caps |= NM_WIFI_DEVICE_CAP_CIPHER_CCMP;
if (range->enc_capa & IW_ENC_CAPA_WPA)
caps |= NM_WIFI_DEVICE_CAP_WPA;
if (range->enc_capa & IW_ENC_CAPA_WPA2)
caps |= NM_WIFI_DEVICE_CAP_RSN;
/* Check for cipher support but not WPA support */
if ( (caps & (NM_WIFI_DEVICE_CAP_CIPHER_TKIP | NM_WIFI_DEVICE_CAP_CIPHER_CCMP))
&& !(caps & (NM_WIFI_DEVICE_CAP_WPA | NM_WIFI_DEVICE_CAP_RSN))) {
nm_log_warn (LOGD_WIFI, "%s: device supports WPA ciphers but not WPA protocol; "
"WPA unavailable.", wext->parent.iface);
caps &= ~WPA_CAPS;
}
/* Check for WPA support but not cipher support */
if ( (caps & (NM_WIFI_DEVICE_CAP_WPA | NM_WIFI_DEVICE_CAP_RSN))
&& !(caps & (NM_WIFI_DEVICE_CAP_CIPHER_TKIP | NM_WIFI_DEVICE_CAP_CIPHER_CCMP))) {
nm_log_warn (LOGD_WIFI, "%s: device supports WPA protocol but not WPA ciphers; "
"WPA unavailable.", wext->parent.iface);
caps &= ~WPA_CAPS;
}
return caps;
}
static WifiData *
wifi_wext_init (const char *iface, int ifindex)
{
WifiDataWext *wext;
struct iw_range range;
guint32 response_len = 0;
struct iw_range_with_scan_capa *scan_capa_range;
int i;
wext = wifi_data_new (iface, ifindex, sizeof (*wext));
wext->parent.get_mode = wifi_wext_get_mode;
wext->parent.set_mode = wifi_wext_set_mode;
wext->parent.get_freq = wifi_wext_get_freq;
wext->parent.find_freq = wifi_wext_find_freq;
wext->parent.get_ssid = wifi_wext_get_ssid;
wext->parent.get_bssid = wifi_wext_get_bssid;
wext->parent.get_rate = wifi_wext_get_rate;
wext->parent.get_qual = wifi_wext_get_qual;
wext->parent.deinit = wifi_wext_deinit;
wext->fd = socket (PF_INET, SOCK_DGRAM, 0);
if (wext->fd < 0)
goto error;
memset (&range, 0, sizeof (struct iw_range));
if (wext_get_range (wext, &range, &response_len) == FALSE) {
nm_log_info (LOGD_HW | LOGD_WIFI, "(%s): driver WEXT range request failed",
wext->parent.iface);
goto error;
}
if ((response_len < 300) || (range.we_version_compiled < 21)) {
nm_log_info (LOGD_HW | LOGD_WIFI,
"(%s): driver WEXT version too old (got %d, expected >= 21)",
wext->parent.iface,
range.we_version_compiled);
goto error;
}
wext->max_qual.qual = range.max_qual.qual;
wext->max_qual.level = range.max_qual.level;
wext->max_qual.noise = range.max_qual.noise;
wext->max_qual.updated = range.max_qual.updated;
wext->num_freqs = MIN (range.num_frequency, IW_MAX_FREQUENCIES);
for (i = 0; i < wext->num_freqs; i++)
wext->freqs[i] = iw_freq_to_uint32 (&range.freq[i]);
/* Check for scanning capability; cards that can't scan are not supported */
if (wext_can_scan (wext) == FALSE) {
nm_log_info (LOGD_HW | LOGD_WIFI,
"(%s): drivers that cannot scan are unsupported",
wext->parent.iface);
goto error;
}
/* Check for the ability to scan specific SSIDs. Until the scan_capa
* field gets added to wireless-tools, need to work around that by casting
* to the custom structure.
*/
scan_capa_range = (struct iw_range_with_scan_capa *) &range;
if (scan_capa_range->scan_capa & NM_IW_SCAN_CAPA_ESSID) {
wext->parent.can_scan_ssid = TRUE;
nm_log_info (LOGD_HW | LOGD_WIFI,
"(%s): driver supports SSID scans (scan_capa 0x%02X).",
wext->parent.iface,
scan_capa_range->scan_capa);
} else {
nm_log_info (LOGD_HW | LOGD_WIFI,
"(%s): driver does not support SSID scans (scan_capa 0x%02X).",
wext->parent.iface,
scan_capa_range->scan_capa);
}
wext->parent.caps = wext_get_caps (wext, &range);
return (WifiData *) wext;
error:
wifi_utils_deinit ((WifiData *) wext);
return NULL;
}
/***************************************************************/
WifiData *
wifi_utils_init (const char *iface, int ifindex)
{

1
src/wifi-utils.h
View file

@ -22,6 +22,7 @@
#ifndef WIFI_UTILS_H
#define WIFI_UTILS_H
#include <net/ethernet.h>
#include <glib.h>
#include "NetworkManager.h"