diff options
Diffstat (limited to 'src/platform/wifi/wifi-utils-wext.c')
| -rw-r--r-- | src/platform/wifi/wifi-utils-wext.c | 766 |
1 files changed, 766 insertions, 0 deletions
diff --git a/src/platform/wifi/wifi-utils-wext.c b/src/platform/wifi/wifi-utils-wext.c new file mode 100644 index 00000000..c8744f79 --- /dev/null +++ b/src/platform/wifi/wifi-utils-wext.c @@ -0,0 +1,766 @@ +/* -*- 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 "nm-default.h" + +#include "wifi-utils-wext.h" + +#include <errno.h> +#include <string.h> +#include <sys/ioctl.h> +#include <net/ethernet.h> +#include <unistd.h> + +/* Hacks necessary to #include wireless.h; yay for WEXT */ +#ifndef __user +#define __user +#endif +#include <sys/types.h> +#include <linux/types.h> +#include <sys/socket.h> +#include <linux/wireless.h> + +#include "wifi-utils-private.h" +#include "nm-utils.h" +#include "platform/nm-platform-utils.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... */ +}; + +#define _NMLOG_PREFIX_NAME "wifi-wext" +#define _NMLOG(level, domain, ...) \ + G_STMT_START { \ + nm_log ((level), (domain), NULL, NULL, \ + "%s: " _NM_UTILS_MACRO_FIRST(__VA_ARGS__), \ + _NMLOG_PREFIX_NAME \ + _NM_UTILS_MACRO_REST(__VA_ARGS__)); \ + } G_STMT_END + +static guint32 +iw_freq_to_uint32 (const 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) * nm_utils_exp10 (freq->e)) / 1000000.0); +} + +static void +wifi_wext_deinit (WifiData *parent) +{ + WifiDataWext *wext = (WifiDataWext *) parent; + + nm_close (wext->fd); +} + +static gboolean +get_ifname (int ifindex, char *buffer, const char *op) +{ + int errsv; + + if (!nmp_utils_if_indextoname (ifindex, buffer)) { + errsv = errno; + _LOGW (LOGD_PLATFORM | LOGD_WIFI, + "error getting interface name for ifindex %d, operation '%s': %s (%d)", + ifindex, op, g_strerror (errsv), errsv); + return FALSE; + } + + return TRUE; +} + +static NM80211Mode +wifi_wext_get_mode_ifname (WifiData *data, const char *ifname) +{ + WifiDataWext *wext = (WifiDataWext *) data; + struct iwreq wrq; + + memset (&wrq, 0, sizeof (struct iwreq)); + nm_utils_ifname_cpy (wrq.ifr_name, ifname); + + if (ioctl (wext->fd, SIOCGIWMODE, &wrq) < 0) { + if (errno != ENODEV) { + _LOGW (LOGD_PLATFORM | LOGD_WIFI, + "(%s): error %d getting card mode", + ifname, errno); + } + return NM_802_11_MODE_UNKNOWN; + } + + switch (wrq.u.mode) { + case IW_MODE_ADHOC: + return NM_802_11_MODE_ADHOC; + case IW_MODE_MASTER: + return NM_802_11_MODE_AP; + case IW_MODE_INFRA: + case IW_MODE_AUTO: /* hack for WEXT devices reporting IW_MODE_AUTO */ + return NM_802_11_MODE_INFRA; + default: + break; + } + return NM_802_11_MODE_UNKNOWN; +} + +static NM80211Mode +wifi_wext_get_mode (WifiData *data) +{ + char ifname[IFNAMSIZ]; + + if (!get_ifname (data->ifindex, ifname, "get-mode")) + return FALSE; + + return wifi_wext_get_mode_ifname (data, ifname); +} + +static gboolean +wifi_wext_set_mode (WifiData *data, const NM80211Mode mode) +{ + WifiDataWext *wext = (WifiDataWext *) data; + struct iwreq wrq; + char ifname[IFNAMSIZ]; + + if (!get_ifname (data->ifindex, ifname, "set-mode")) + return FALSE; + + if (wifi_wext_get_mode_ifname (data, ifname) == 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_AP: + wrq.u.mode = IW_MODE_MASTER; + break; + case NM_802_11_MODE_INFRA: + wrq.u.mode = IW_MODE_INFRA; + break; + default: + g_warn_if_reached (); + return FALSE; + } + + nm_utils_ifname_cpy (wrq.ifr_name, ifname); + if (ioctl (wext->fd, SIOCSIWMODE, &wrq) < 0) { + if (errno != ENODEV) { + _LOGE (LOGD_PLATFORM | LOGD_WIFI, + "(%s): error setting mode %d", + ifname, mode); + } + return FALSE; + } + + return TRUE; +} + +static gboolean +wifi_wext_set_powersave (WifiData *data, guint32 powersave) +{ + WifiDataWext *wext = (WifiDataWext *) data; + struct iwreq wrq; + char ifname[IFNAMSIZ]; + + if (!get_ifname (data->ifindex, ifname, "set-powersave")) + return FALSE; + + memset (&wrq, 0, sizeof (struct iwreq)); + if (powersave == 1) { + wrq.u.power.flags = IW_POWER_ALL_R; + } else + wrq.u.power.disabled = 1; + + nm_utils_ifname_cpy (wrq.ifr_name, ifname); + if (ioctl (wext->fd, SIOCSIWPOWER, &wrq) < 0) { + if (errno != ENODEV) { + _LOGE (LOGD_PLATFORM | LOGD_WIFI, + "(%s): error setting powersave %" G_GUINT32_FORMAT, + ifname, powersave); + } + return FALSE; + } + + return TRUE; +} + +static guint32 +wifi_wext_get_freq (WifiData *data) +{ + WifiDataWext *wext = (WifiDataWext *) data; + struct iwreq wrq; + char ifname[IFNAMSIZ]; + + if (!get_ifname (data->ifindex, ifname, "get-freq")) + return FALSE; + + memset (&wrq, 0, sizeof (struct iwreq)); + nm_utils_ifname_cpy (wrq.ifr_name, ifname); + if (ioctl (wext->fd, SIOCGIWFREQ, &wrq) < 0) { + _LOGW (LOGD_PLATFORM | LOGD_WIFI, + "(%s): error getting frequency: %s", + ifname, 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 gboolean +wifi_wext_get_bssid (WifiData *data, guint8 *out_bssid) +{ + WifiDataWext *wext = (WifiDataWext *) data; + struct iwreq wrq; + char ifname[IFNAMSIZ]; + + if (!get_ifname (data->ifindex, ifname, "get-bssid")) + return FALSE; + + memset (&wrq, 0, sizeof (wrq)); + nm_utils_ifname_cpy (wrq.ifr_name, ifname); + if (ioctl (wext->fd, SIOCGIWAP, &wrq) < 0) { + _LOGW (LOGD_PLATFORM | LOGD_WIFI, + "(%s): error getting associated BSSID: %s", + ifname, strerror (errno)); + return FALSE; + } + memcpy (out_bssid, &(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; + char ifname[IFNAMSIZ]; + + if (!get_ifname (data->ifindex, ifname, "get-rate")) + return FALSE; + + memset (&wrq, 0, sizeof (wrq)); + nm_utils_ifname_cpy (wrq.ifr_name, ifname); + 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 */ + + _LOGD (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 - 1); + + /* A sort of signal-to-noise ratio calculation */ + level_percent = (int) (100 - 70 * (((double)max_level - (double)level) / + ((double)max_level - (double)noise))); + _LOGD (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)); + _LOGD (LOGD_WIFI, "QL2: level_percent is %d. max_level %d, level %d.", + level_percent, max_qual->level, level); + } else if (percent == -1) { + _LOGD (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; + + _LOGD (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; + char ifname[IFNAMSIZ]; + + if (!get_ifname (data->ifindex, ifname, "get-qual")) + return FALSE; + + memset (&stats, 0, sizeof (stats)); + wrq.u.data.pointer = &stats; + wrq.u.data.length = sizeof (stats); + wrq.u.data.flags = 1; /* Clear updated flag */ + nm_utils_ifname_cpy (wrq.ifr_name, ifname); + + if (ioctl (wext->fd, SIOCGIWSTATS, &wrq) < 0) { + _LOGW (LOGD_PLATFORM | LOGD_WIFI, + "(%s): error getting signal strength: %s", + ifname, strerror (errno)); + return -1; + } + + return wext_qual_to_percent (&stats.qual, &wext->max_qual); +} + +/*****************************************************************************/ +/* OLPC Mesh-only functions */ + +static guint32 +wifi_wext_get_mesh_channel (WifiData *data) +{ + WifiDataWext *wext = (WifiDataWext *) data; + guint32 freq; + int i; + + freq = wifi_utils_get_freq (data); + for (i = 0; i < wext->num_freqs; i++) { + if (freq == wext->freqs[i]) + return i + 1; + } + return 0; +} + +static gboolean +wifi_wext_set_mesh_channel (WifiData *data, guint32 channel) +{ + WifiDataWext *wext = (WifiDataWext *) data; + struct iwreq wrq; + char ifname[IFNAMSIZ]; + + if (!get_ifname (data->ifindex, ifname, "set-mesh-channel")) + return FALSE; + + memset (&wrq, 0, sizeof (struct iwreq)); + nm_utils_ifname_cpy (wrq.ifr_name, ifname); + + if (channel > 0) { + wrq.u.freq.flags = IW_FREQ_FIXED; + wrq.u.freq.e = 0; + wrq.u.freq.m = channel; + } + + if (ioctl (wext->fd, SIOCSIWFREQ, &wrq) < 0) { + _LOGE (LOGD_PLATFORM | LOGD_WIFI | LOGD_OLPC, + "(%s): error setting channel to %d: %s", + ifname, channel, strerror (errno)); + return FALSE; + } + + return TRUE; +} + +static gboolean +wifi_wext_set_mesh_ssid (WifiData *data, const guint8 *ssid, gsize len) +{ + WifiDataWext *wext = (WifiDataWext *) data; + struct iwreq wrq; + char buf[IW_ESSID_MAX_SIZE + 1]; + char ifname[IFNAMSIZ]; + int errsv; + + if (!get_ifname (data->ifindex, ifname, "set-mesh-ssid")) + return FALSE; + + memset (buf, 0, sizeof (buf)); + memcpy (buf, ssid, MIN (sizeof (buf) - 1, len)); + + wrq.u.essid.pointer = (caddr_t) buf; + wrq.u.essid.length = len; + wrq.u.essid.flags = (len > 0) ? 1 : 0; /* 1=enable SSID, 0=disable/any */ + + nm_utils_ifname_cpy (wrq.ifr_name, ifname); + if (ioctl (wext->fd, SIOCSIWESSID, &wrq) == 0) + return TRUE; + + if (errno != ENODEV) { + errsv = errno; + _LOGE (LOGD_PLATFORM | LOGD_WIFI | LOGD_OLPC, + "(%s): error setting SSID to '%s': %s", + ifname, + ssid ? nm_utils_escape_ssid (ssid, len) : "(null)", + strerror (errsv)); + } + + return FALSE; +} + +/*****************************************************************************/ + +static gboolean +wext_can_scan_ifname (WifiDataWext *wext, const char *ifname) +{ + struct iwreq wrq; + + memset (&wrq, 0, sizeof (struct iwreq)); + nm_utils_ifname_cpy (wrq.ifr_name, ifname); + if (ioctl (wext->fd, SIOCSIWSCAN, &wrq) < 0) { + if (errno == EOPNOTSUPP) + return FALSE; + } + return TRUE; +} + +static gboolean +wext_get_range_ifname (WifiDataWext *wext, + const char *ifname, + struct iw_range *range, + guint32 *response_len) +{ + int i = 26; + gboolean success = FALSE; + struct iwreq wrq; + + memset (&wrq, 0, sizeof (struct iwreq)); + nm_utils_ifname_cpy (wrq.ifr_name, ifname); + 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) { + _LOGE (LOGD_PLATFORM | LOGD_WIFI, + "(%s): couldn't get driver range information (%d).", + ifname, errno); + break; + } + + g_usleep (G_USEC_PER_SEC / 4); + } + + if (i <= 0) { + _LOGW (LOGD_PLATFORM | LOGD_WIFI, + "(%s): driver took too long to respond to IWRANGE query.", + ifname); + } + + 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, const char *ifname, 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))) { + _LOGW (LOGD_WIFI, + "%s: device supports WPA ciphers but not WPA protocol; WPA unavailable.", + ifname); + 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))) { + _LOGW (LOGD_WIFI, + "%s: device supports WPA protocol but not WPA ciphers; WPA unavailable.", + ifname); + caps &= ~WPA_CAPS; + } + + /* There's no way to detect Ad-Hoc/AP mode support with WEXT + * (other than actually trying to do it), so just assume that + * Ad-Hoc is supported and AP isn't. + */ + caps |= NM_WIFI_DEVICE_CAP_ADHOC; + + return caps; +} + +WifiData * +wifi_wext_init (int ifindex, gboolean check_scan) +{ + static const WifiDataClass klass = { + .struct_size = sizeof (WifiDataWext), + .get_mode = wifi_wext_get_mode, + .set_mode = wifi_wext_set_mode, + .set_powersave = wifi_wext_set_powersave, + .get_freq = wifi_wext_get_freq, + .find_freq = wifi_wext_find_freq, + .get_bssid = wifi_wext_get_bssid, + .get_rate = wifi_wext_get_rate, + .get_qual = wifi_wext_get_qual, + .deinit = wifi_wext_deinit, + .get_mesh_channel = wifi_wext_get_mesh_channel, + .set_mesh_channel = wifi_wext_set_mesh_channel, + .set_mesh_ssid = wifi_wext_set_mesh_ssid, + }; + WifiDataWext *wext; + struct iw_range range; + guint32 response_len = 0; + struct iw_range_with_scan_capa *scan_capa_range; + int i; + gboolean freq_valid = FALSE, has_5ghz = FALSE, has_2ghz = FALSE; + char ifname[IFNAMSIZ]; + + if (!nmp_utils_if_indextoname (ifindex, ifname)) { + _LOGW (LOGD_PLATFORM | LOGD_WIFI, + "can't determine interface name for ifindex %d", ifindex); + return NULL; + } + + wext = wifi_data_new (&klass, ifindex); + + wext->fd = socket (PF_INET, SOCK_DGRAM | SOCK_CLOEXEC, 0); + if (wext->fd < 0) + goto error; + + memset (&range, 0, sizeof (struct iw_range)); + if (wext_get_range_ifname (wext, ifname, &range, &response_len) == FALSE) { + _LOGI (LOGD_PLATFORM | LOGD_WIFI, "(%s): driver WEXT range request failed", + ifname); + goto error; + } + + if ((response_len < 300) || (range.we_version_compiled < 21)) { + _LOGI (LOGD_PLATFORM | LOGD_WIFI, + "(%s): driver WEXT version too old (got %d, expected >= 21)", + ifname, + 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]); + freq_valid = TRUE; + if (wext->freqs[i] > 2400 && wext->freqs[i] < 2500) + has_2ghz = TRUE; + else if (wext->freqs[i] > 4900 && wext->freqs[i] < 6000) + has_5ghz = TRUE; + } + + /* Check for scanning capability; cards that can't scan are not supported */ + if (check_scan && (wext_can_scan_ifname (wext, ifname) == FALSE)) { + _LOGI (LOGD_PLATFORM | LOGD_WIFI, + "(%s): drivers that cannot scan are unsupported", + ifname); + 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 *) ⦥ + if (scan_capa_range->scan_capa & NM_IW_SCAN_CAPA_ESSID) { + _LOGI (LOGD_PLATFORM | LOGD_WIFI, + "(%s): driver supports SSID scans (scan_capa 0x%02X).", + ifname, + scan_capa_range->scan_capa); + } else { + _LOGI (LOGD_PLATFORM | LOGD_WIFI, + "(%s): driver does not support SSID scans (scan_capa 0x%02X).", + ifname, + scan_capa_range->scan_capa); + } + + wext->parent.caps = wext_get_caps (wext, ifname, &range); + if (freq_valid) + wext->parent.caps |= NM_WIFI_DEVICE_CAP_FREQ_VALID; + if (has_2ghz) + wext->parent.caps |= NM_WIFI_DEVICE_CAP_FREQ_2GHZ; + if (has_5ghz) + wext->parent.caps |= NM_WIFI_DEVICE_CAP_FREQ_5GHZ; + + _LOGI (LOGD_PLATFORM | LOGD_WIFI, + "(%s): using WEXT for WiFi device control", + ifname); + + return (WifiData *) wext; + +error: + wifi_utils_unref ((WifiData *) wext); + return NULL; +} + +gboolean +wifi_wext_is_wifi (const char *iface) +{ + int fd; + struct iwreq iwr; + gboolean is_wifi = FALSE; + + /* performing an ioctl on a non-existing name may cause the automatic + * loading of kernel modules, which should be avoided. + * + * Usually, we should thus make sure that an inteface with this name + * exists. + * + * Note that wifi_wext_is_wifi() has only one caller which just verified + * that an interface with this name exists. + */ + + fd = socket (PF_INET, SOCK_DGRAM | SOCK_CLOEXEC, 0); + if (fd >= 0) { + nm_utils_ifname_cpy (iwr.ifr_ifrn.ifrn_name, iface); + if (ioctl (fd, SIOCGIWNAME, &iwr) == 0) + is_wifi = TRUE; + nm_close (fd); + } + return is_wifi; +} |