2015-01-12 16:52:37 +01:00
|
|
|
/*
|
|
|
|
*
|
|
|
|
* Wireless daemon for Linux
|
|
|
|
*
|
|
|
|
* Copyright (C) 2015 Intel Corporation. All rights reserved.
|
|
|
|
*
|
|
|
|
* This library is free software; you can redistribute it and/or
|
|
|
|
* modify it under the terms of the GNU Lesser General Public
|
|
|
|
* License as published by the Free Software Foundation; either
|
|
|
|
* version 2.1 of the License, or (at your option) any later version.
|
|
|
|
*
|
|
|
|
* This library 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
|
|
|
|
* Lesser General Public License for more details.
|
|
|
|
*
|
|
|
|
* You should have received a copy of the GNU Lesser General Public
|
|
|
|
* License along with this library; if not, write to the Free Software
|
|
|
|
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
|
|
|
|
*
|
|
|
|
*/
|
|
|
|
|
|
|
|
#ifdef HAVE_CONFIG_H
|
|
|
|
#include <config.h>
|
|
|
|
#endif
|
|
|
|
|
|
|
|
#include <stdlib.h>
|
|
|
|
#include <stdio.h>
|
|
|
|
#include <errno.h>
|
|
|
|
#include <sys/socket.h>
|
2015-06-06 01:18:55 +02:00
|
|
|
#include <limits.h>
|
2015-01-12 16:52:37 +01:00
|
|
|
#include <linux/if.h>
|
|
|
|
#include <linux/if_ether.h>
|
|
|
|
#include <ell/ell.h>
|
|
|
|
|
|
|
|
#include "linux/nl80211.h"
|
|
|
|
#include "src/iwd.h"
|
|
|
|
#include "src/wiphy.h"
|
2015-01-28 13:14:53 +01:00
|
|
|
#include "src/ie.h"
|
2015-01-12 16:52:37 +01:00
|
|
|
#include "src/scan.h"
|
|
|
|
|
2015-06-05 05:31:39 +02:00
|
|
|
#define SCAN_MAX_INTERVAL 320
|
|
|
|
#define SCAN_INIT_INTERVAL 10
|
|
|
|
|
|
|
|
struct l_queue *periodic_scans = NULL;
|
|
|
|
|
2015-06-01 16:28:05 +02:00
|
|
|
struct l_genl_family *nl80211 = NULL;
|
|
|
|
uint32_t scan_id = 0;
|
|
|
|
|
|
|
|
scan_notify_func_t notify = NULL;
|
|
|
|
|
|
|
|
struct scan_results {
|
|
|
|
uint32_t wiphy;
|
|
|
|
uint32_t ifindex;
|
|
|
|
struct l_queue *bss_list;
|
2015-06-10 23:24:31 +02:00
|
|
|
struct scan_freq_set *freqs;
|
2015-06-01 16:28:05 +02:00
|
|
|
};
|
|
|
|
|
2015-06-05 05:31:39 +02:00
|
|
|
struct scan_periodic {
|
|
|
|
uint32_t ifindex;
|
|
|
|
struct l_timeout *timeout;
|
|
|
|
uint16_t interval;
|
|
|
|
bool triggered:1;
|
|
|
|
};
|
|
|
|
|
2015-01-12 16:52:37 +01:00
|
|
|
void scan_start(struct l_genl_family *nl80211, uint32_t ifindex,
|
|
|
|
scan_func_t callback, void *user_data)
|
|
|
|
{
|
|
|
|
struct l_genl_msg *msg;
|
|
|
|
|
|
|
|
msg = l_genl_msg_new_sized(NL80211_CMD_TRIGGER_SCAN, 16);
|
|
|
|
l_genl_msg_append_attr(msg, NL80211_ATTR_IFINDEX, 4, &ifindex);
|
|
|
|
l_genl_family_send(nl80211, msg, callback, user_data, NULL);
|
|
|
|
}
|
2015-01-12 16:52:38 +01:00
|
|
|
|
|
|
|
void scan_sched_start(struct l_genl_family *nl80211, uint32_t ifindex,
|
|
|
|
uint32_t scan_interval,
|
|
|
|
scan_func_t callback, void *user_data)
|
|
|
|
{
|
|
|
|
struct l_genl_msg *msg;
|
|
|
|
|
|
|
|
scan_interval *= 1000; /* in kernel the interval is in msecs */
|
|
|
|
|
|
|
|
msg = l_genl_msg_new_sized(NL80211_CMD_START_SCHED_SCAN, 32);
|
|
|
|
l_genl_msg_append_attr(msg, NL80211_ATTR_IFINDEX, 4, &ifindex);
|
|
|
|
l_genl_msg_append_attr(msg, NL80211_ATTR_SCHED_SCAN_INTERVAL,
|
|
|
|
4, &scan_interval);
|
|
|
|
l_genl_msg_append_attr(msg, NL80211_ATTR_SOCKET_OWNER, 0, NULL);
|
|
|
|
|
|
|
|
if (!l_genl_family_send(nl80211, msg, callback, user_data, NULL))
|
|
|
|
l_error("Starting scheduled scan failed");
|
|
|
|
}
|
2015-01-12 16:52:39 +01:00
|
|
|
|
2015-06-05 05:31:39 +02:00
|
|
|
static struct scan_periodic *scan_periodic_new(uint32_t ifindex)
|
|
|
|
{
|
|
|
|
struct scan_periodic *sp;
|
|
|
|
|
|
|
|
sp = l_new(struct scan_periodic, 1);
|
|
|
|
|
|
|
|
sp->ifindex = ifindex;
|
|
|
|
sp->interval = SCAN_INIT_INTERVAL;
|
|
|
|
|
|
|
|
return sp;
|
|
|
|
}
|
|
|
|
|
|
|
|
static void scan_periodic_free(struct scan_periodic *sp)
|
|
|
|
{
|
|
|
|
if (sp->timeout)
|
|
|
|
l_timeout_remove(sp->timeout);
|
|
|
|
|
|
|
|
l_free(sp);
|
|
|
|
}
|
|
|
|
|
|
|
|
static void scan_periodic_done(struct l_genl_msg *msg, void *user_data)
|
|
|
|
{
|
|
|
|
struct scan_periodic *sp = user_data;
|
|
|
|
int err;
|
|
|
|
|
|
|
|
l_debug("");
|
|
|
|
|
|
|
|
err = l_genl_msg_get_error(msg);
|
|
|
|
if (err < 0) {
|
|
|
|
/* Scan already in progress */
|
|
|
|
if (err != -EBUSY)
|
|
|
|
sp->triggered = true;
|
|
|
|
else
|
|
|
|
l_warn("Periodic scan could not be triggered: %s (%d)",
|
|
|
|
strerror(-err), -err);
|
|
|
|
return;
|
|
|
|
}
|
|
|
|
|
|
|
|
sp->triggered = true;
|
|
|
|
l_debug("Periodic scan triggered for ifindex: %u", sp->ifindex);
|
|
|
|
}
|
|
|
|
|
|
|
|
static bool scan_periodic_match(const void *a, const void *b)
|
|
|
|
{
|
|
|
|
const struct scan_periodic *sp = a;
|
|
|
|
uint32_t ifindex = L_PTR_TO_UINT(b);
|
|
|
|
|
|
|
|
return (sp->ifindex == ifindex);
|
|
|
|
}
|
|
|
|
|
|
|
|
void scan_periodic_start(uint32_t ifindex)
|
|
|
|
{
|
|
|
|
struct scan_periodic *sp;
|
|
|
|
|
|
|
|
sp = l_queue_find(periodic_scans, scan_periodic_match,
|
|
|
|
L_UINT_TO_PTR(ifindex));
|
|
|
|
|
|
|
|
if (sp)
|
|
|
|
return;
|
|
|
|
|
|
|
|
l_debug("Starting periodic scan for ifindex: %u", ifindex);
|
|
|
|
|
|
|
|
sp = scan_periodic_new(ifindex);
|
|
|
|
l_queue_push_head(periodic_scans, sp);
|
|
|
|
scan_start(nl80211, ifindex, scan_periodic_done, sp);
|
|
|
|
}
|
|
|
|
|
|
|
|
bool scan_periodic_stop(uint32_t ifindex)
|
|
|
|
{
|
|
|
|
struct scan_periodic *sp;
|
|
|
|
|
|
|
|
sp = l_queue_remove_if(periodic_scans, scan_periodic_match,
|
|
|
|
L_UINT_TO_PTR(ifindex));
|
|
|
|
|
|
|
|
if (!sp)
|
|
|
|
return false;
|
|
|
|
|
|
|
|
l_debug("Stopping periodic scan for ifindex: %u", ifindex);
|
|
|
|
|
|
|
|
scan_periodic_free(sp);
|
|
|
|
return true;
|
|
|
|
}
|
|
|
|
|
|
|
|
static void scan_periodic_timeout(struct l_timeout *timeout, void *user_data)
|
|
|
|
{
|
|
|
|
struct scan_periodic *sp = user_data;
|
|
|
|
|
|
|
|
l_debug("scan_periodic_timeout: %u", sp->ifindex);
|
|
|
|
|
|
|
|
sp->interval *= 2;
|
|
|
|
scan_start(nl80211, sp->ifindex, scan_periodic_done, sp);
|
|
|
|
}
|
|
|
|
|
|
|
|
static void scan_periodic_rearm(struct scan_periodic *sp)
|
|
|
|
{
|
|
|
|
l_debug("Arming periodic scan timer: %u", sp->interval);
|
|
|
|
|
|
|
|
if (sp->timeout)
|
|
|
|
l_timeout_modify(sp->timeout, sp->interval);
|
|
|
|
else
|
|
|
|
sp->timeout = l_timeout_create(sp->interval,
|
|
|
|
scan_periodic_timeout, sp, NULL);
|
|
|
|
}
|
|
|
|
|
2015-01-28 13:14:53 +01:00
|
|
|
enum scan_ssid_security scan_get_ssid_security(
|
|
|
|
enum ie_bss_capability bss_capability,
|
2015-01-28 21:25:21 +01:00
|
|
|
const struct ie_rsn_info *info)
|
2015-01-28 13:14:53 +01:00
|
|
|
{
|
2015-01-30 11:21:52 +01:00
|
|
|
if (info && (info->akm_suites & IE_RSN_AKM_SUITE_PSK ||
|
2015-01-28 13:14:53 +01:00
|
|
|
info->akm_suites & IE_RSN_AKM_SUITE_PSK_SHA256 ||
|
2015-01-30 11:21:52 +01:00
|
|
|
info->akm_suites & IE_RSN_AKM_SUITE_FT_USING_PSK ||
|
|
|
|
info->akm_suites & IE_RSN_AKM_SUITE_SAE_SHA256 ||
|
|
|
|
info->akm_suites & IE_RSN_AKM_SUITE_FT_OVER_SAE_SHA256))
|
2015-01-28 13:14:53 +01:00
|
|
|
return SCAN_SSID_SECURITY_PSK;
|
|
|
|
|
2015-01-30 11:21:52 +01:00
|
|
|
if (info && (info->akm_suites & IE_RSN_AKM_SUITE_8021X ||
|
|
|
|
info->akm_suites & IE_RSN_AKM_SUITE_8021X_SHA256 ||
|
|
|
|
info->akm_suites & IE_RSN_AKM_SUITE_FT_OVER_8021X))
|
|
|
|
return SCAN_SSID_SECURITY_8021X;
|
|
|
|
|
|
|
|
if (bss_capability & IE_BSS_CAP_PRIVACY)
|
|
|
|
return SCAN_SSID_SECURITY_WEP;
|
|
|
|
|
|
|
|
return SCAN_SSID_SECURITY_NONE;
|
2015-01-28 13:14:53 +01:00
|
|
|
}
|
2015-05-01 05:21:31 +02:00
|
|
|
|
2015-05-01 16:17:54 +02:00
|
|
|
static bool scan_parse_bss_information_elements(struct scan_bss *bss,
|
|
|
|
const void *data, uint16_t len)
|
|
|
|
{
|
|
|
|
struct ie_tlv_iter iter;
|
2015-06-01 16:28:05 +02:00
|
|
|
bool have_ssid = false;
|
2015-05-01 16:17:54 +02:00
|
|
|
|
|
|
|
ie_tlv_iter_init(&iter, data, len);
|
|
|
|
|
|
|
|
while (ie_tlv_iter_next(&iter)) {
|
|
|
|
uint8_t tag = ie_tlv_iter_get_tag(&iter);
|
|
|
|
|
|
|
|
switch (tag) {
|
|
|
|
case IE_TYPE_SSID:
|
|
|
|
if (iter.len > 32)
|
|
|
|
return false;
|
|
|
|
|
2015-06-01 16:28:05 +02:00
|
|
|
memcpy(bss->ssid, iter.data, iter.len);
|
|
|
|
bss->ssid_len = iter.len;
|
|
|
|
have_ssid = true;
|
2015-05-01 16:17:54 +02:00
|
|
|
break;
|
2015-06-10 20:05:58 +02:00
|
|
|
case IE_TYPE_SUPPORTED_RATES:
|
|
|
|
case IE_TYPE_EXTENDED_SUPPORTED_RATES:
|
|
|
|
if (ie_parse_supported_rates(&iter,
|
|
|
|
&bss->supported_rates) < 0)
|
|
|
|
l_warn("Unable to parse [Extended] "
|
|
|
|
"Supported Rates IE");
|
|
|
|
break;
|
2015-05-01 16:17:54 +02:00
|
|
|
case IE_TYPE_RSN:
|
|
|
|
if (!bss->rsne)
|
|
|
|
bss->rsne = l_memdup(iter.data - 2,
|
|
|
|
iter.len + 2);
|
|
|
|
break;
|
2015-06-10 19:37:50 +02:00
|
|
|
case IE_TYPE_BSS_LOAD:
|
|
|
|
if (ie_parse_bss_load(&iter, NULL, &bss->utilization,
|
|
|
|
NULL) < 0)
|
|
|
|
l_warn("Unable to parse BSS Load IE");
|
|
|
|
else
|
|
|
|
l_debug("Load: %u/255", bss->utilization);
|
|
|
|
|
|
|
|
break;
|
2015-05-01 16:17:54 +02:00
|
|
|
case IE_TYPE_VENDOR_SPECIFIC:
|
|
|
|
/* Interested only in WPA IE from Vendor data */
|
|
|
|
if (!bss->wpa && is_ie_wpa_ie(iter.data, iter.len))
|
|
|
|
bss->wpa = l_memdup(iter.data - 2,
|
|
|
|
iter.len + 2);
|
|
|
|
break;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
2015-06-01 16:28:05 +02:00
|
|
|
return have_ssid;
|
2015-05-01 16:17:54 +02:00
|
|
|
}
|
|
|
|
|
2015-06-01 16:28:05 +02:00
|
|
|
static struct scan_bss *scan_parse_attr_bss(struct l_genl_attr *attr)
|
2015-05-01 16:17:54 +02:00
|
|
|
{
|
|
|
|
uint16_t type, len;
|
|
|
|
const void *data;
|
|
|
|
struct scan_bss *bss;
|
|
|
|
|
|
|
|
bss = l_new(struct scan_bss, 1);
|
2015-06-10 19:37:50 +02:00
|
|
|
bss->utilization = 127;
|
2015-05-01 16:17:54 +02:00
|
|
|
|
|
|
|
while (l_genl_attr_next(attr, &type, &len, &data)) {
|
|
|
|
switch (type) {
|
|
|
|
case NL80211_BSS_BSSID:
|
|
|
|
if (len != sizeof(bss->addr))
|
|
|
|
goto fail;
|
|
|
|
|
|
|
|
memcpy(bss->addr, data, len);
|
|
|
|
break;
|
|
|
|
case NL80211_BSS_CAPABILITY:
|
|
|
|
if (len != sizeof(uint16_t))
|
|
|
|
goto fail;
|
|
|
|
|
|
|
|
bss->capability = *((uint16_t *) data);
|
|
|
|
break;
|
|
|
|
case NL80211_BSS_FREQUENCY:
|
|
|
|
if (len != sizeof(uint32_t))
|
|
|
|
goto fail;
|
|
|
|
|
|
|
|
bss->frequency = *((uint32_t *) data);
|
|
|
|
break;
|
|
|
|
case NL80211_BSS_SIGNAL_MBM:
|
|
|
|
if (len != sizeof(int32_t))
|
|
|
|
goto fail;
|
|
|
|
|
|
|
|
bss->signal_strength = *((int32_t *) data);
|
|
|
|
break;
|
|
|
|
case NL80211_BSS_INFORMATION_ELEMENTS:
|
|
|
|
if (!scan_parse_bss_information_elements(bss,
|
2015-06-01 16:28:05 +02:00
|
|
|
data, len))
|
2015-05-01 16:17:54 +02:00
|
|
|
goto fail;
|
|
|
|
|
|
|
|
break;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
return bss;
|
|
|
|
|
|
|
|
fail:
|
|
|
|
scan_bss_free(bss);
|
|
|
|
return NULL;
|
|
|
|
}
|
|
|
|
|
2015-06-10 23:24:31 +02:00
|
|
|
static struct scan_freq_set *scan_parse_attr_scan_frequencies(
|
|
|
|
struct l_genl_attr *attr)
|
|
|
|
{
|
|
|
|
uint16_t type, len;
|
|
|
|
const void *data;
|
|
|
|
struct scan_freq_set *set;
|
|
|
|
|
|
|
|
set = scan_freq_set_new();
|
|
|
|
|
|
|
|
while (l_genl_attr_next(attr, &type, &len, &data)) {
|
|
|
|
uint32_t freq;
|
|
|
|
|
|
|
|
if (len != sizeof(uint32_t))
|
|
|
|
continue;
|
|
|
|
|
|
|
|
freq = *((uint32_t *) data);
|
|
|
|
scan_freq_set_add(set, freq);
|
|
|
|
}
|
|
|
|
|
|
|
|
return set;
|
|
|
|
}
|
|
|
|
|
2015-06-01 16:28:05 +02:00
|
|
|
static struct scan_bss *scan_parse_result(struct l_genl_msg *msg,
|
2015-05-01 16:17:54 +02:00
|
|
|
uint32_t *out_ifindex,
|
2015-06-01 16:28:05 +02:00
|
|
|
uint64_t *out_wdev)
|
2015-05-01 16:17:54 +02:00
|
|
|
{
|
|
|
|
struct l_genl_attr attr, nested;
|
|
|
|
uint16_t type, len;
|
|
|
|
const void *data;
|
|
|
|
uint32_t ifindex;
|
|
|
|
uint64_t wdev;
|
|
|
|
struct scan_bss *bss = NULL;
|
|
|
|
|
|
|
|
if (!l_genl_attr_init(&attr, msg))
|
|
|
|
return NULL;
|
|
|
|
|
|
|
|
while (l_genl_attr_next(&attr, &type, &len, &data)) {
|
|
|
|
switch (type) {
|
|
|
|
case NL80211_ATTR_IFINDEX:
|
|
|
|
if (len != sizeof(uint32_t))
|
|
|
|
return NULL;
|
|
|
|
|
|
|
|
ifindex = *((uint32_t *) data);
|
|
|
|
break;
|
|
|
|
|
|
|
|
case NL80211_ATTR_WDEV:
|
|
|
|
if (len != sizeof(uint64_t))
|
|
|
|
return NULL;
|
|
|
|
|
|
|
|
wdev = *((uint64_t *) data);
|
|
|
|
break;
|
|
|
|
|
|
|
|
case NL80211_ATTR_BSS:
|
|
|
|
if (!l_genl_attr_recurse(&attr, &nested))
|
|
|
|
return NULL;
|
|
|
|
|
2015-06-01 16:28:05 +02:00
|
|
|
bss = scan_parse_attr_bss(&nested);
|
2015-05-01 16:17:54 +02:00
|
|
|
break;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
if (!bss)
|
|
|
|
return NULL;
|
|
|
|
|
|
|
|
if (out_ifindex)
|
|
|
|
*out_ifindex = ifindex;
|
|
|
|
|
|
|
|
if (out_wdev)
|
|
|
|
*out_wdev = wdev;
|
|
|
|
|
|
|
|
return bss;
|
|
|
|
}
|
|
|
|
|
2015-06-22 21:12:09 +02:00
|
|
|
static void scan_bss_compute_rank(struct scan_bss *bss)
|
2015-06-06 01:18:55 +02:00
|
|
|
{
|
2015-06-10 19:25:27 +02:00
|
|
|
static const double RANK_RSNE_FACTOR = 1.2;
|
|
|
|
static const double RANK_WPA_FACTOR = 1.0;
|
|
|
|
static const double RANK_OPEN_FACTOR = 0.5;
|
|
|
|
static const double RANK_NO_PRIVACY_FACTOR = 0.5;
|
|
|
|
static const double RANK_5G_FACTOR = 1.1;
|
2015-06-10 19:37:50 +02:00
|
|
|
static const double RANK_HIGH_UTILIZATION_FACTOR = 0.8;
|
|
|
|
static const double RANK_LOW_UTILIZATION_FACTOR = 1.2;
|
2015-06-10 20:06:19 +02:00
|
|
|
static const double RANK_MIN_SUPPORTED_RATE_FACTOR = 0.8;
|
|
|
|
static const double RANK_MAX_SUPPORTED_RATE_FACTOR = 1.1;
|
2015-06-06 01:18:55 +02:00
|
|
|
double rank;
|
|
|
|
uint32_t irank;
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Signal strength is in mBm (100 * dBm) and is negative.
|
|
|
|
* WiFi range is -0 to -100 dBm
|
|
|
|
*/
|
|
|
|
|
|
|
|
/* Heavily slanted towards signal strength */
|
2015-06-10 19:36:53 +02:00
|
|
|
rank = 10000 + bss->signal_strength;
|
2015-06-06 01:18:55 +02:00
|
|
|
|
|
|
|
/*
|
|
|
|
* Prefer RSNE first, WPA second. Open networks are much less
|
|
|
|
* desirable.
|
|
|
|
*/
|
|
|
|
if (bss->rsne)
|
|
|
|
rank *= RANK_RSNE_FACTOR;
|
|
|
|
else if (bss->wpa)
|
|
|
|
rank *= RANK_WPA_FACTOR;
|
|
|
|
else
|
|
|
|
rank *= RANK_OPEN_FACTOR;
|
|
|
|
|
|
|
|
/* We prefer networks with CAP PRIVACY */
|
|
|
|
if (!(bss->capability & IE_BSS_CAP_PRIVACY))
|
|
|
|
rank *= RANK_NO_PRIVACY_FACTOR;
|
|
|
|
|
|
|
|
/* Prefer 5G networks over 2.4G */
|
|
|
|
if (bss->frequency > 4000)
|
|
|
|
rank *= RANK_5G_FACTOR;
|
|
|
|
|
2015-06-10 19:37:50 +02:00
|
|
|
/* Rank loaded APs lower and lighly loaded APs higher */
|
|
|
|
if (bss->utilization >= 192)
|
|
|
|
rank *= RANK_HIGH_UTILIZATION_FACTOR;
|
|
|
|
else if (bss->utilization <= 63)
|
|
|
|
rank *= RANK_LOW_UTILIZATION_FACTOR;
|
2015-06-06 01:18:55 +02:00
|
|
|
|
2015-06-10 20:06:19 +02:00
|
|
|
if (bss->supported_rates) {
|
|
|
|
uint8_t max = l_uintset_find_max(bss->supported_rates);
|
|
|
|
double factor = RANK_MAX_SUPPORTED_RATE_FACTOR -
|
|
|
|
RANK_MIN_SUPPORTED_RATE_FACTOR;
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Maximum rate is 54 Mbps, see DATA_RATE in 802.11-2012,
|
|
|
|
* Section 6.5.5.2
|
|
|
|
*/
|
|
|
|
factor = factor * max / 108 + RANK_MIN_SUPPORTED_RATE_FACTOR;
|
|
|
|
bss->rank *= factor;
|
|
|
|
}
|
2015-06-06 01:18:55 +02:00
|
|
|
|
|
|
|
irank = rank;
|
|
|
|
|
|
|
|
if (irank > USHRT_MAX)
|
|
|
|
bss->rank = USHRT_MAX;
|
|
|
|
else
|
|
|
|
bss->rank = irank;
|
|
|
|
}
|
|
|
|
|
2015-05-01 05:21:31 +02:00
|
|
|
void scan_bss_free(struct scan_bss *bss)
|
|
|
|
{
|
2015-06-10 20:05:58 +02:00
|
|
|
l_uintset_free(bss->supported_rates);
|
2015-05-01 05:21:31 +02:00
|
|
|
l_free(bss->rsne);
|
|
|
|
l_free(bss->wpa);
|
|
|
|
l_free(bss);
|
|
|
|
}
|
2015-05-18 13:31:38 +02:00
|
|
|
|
|
|
|
void bss_get_supported_ciphers(struct scan_bss *bss,
|
|
|
|
uint16_t *pairwise_ciphers,
|
|
|
|
uint16_t *group_ciphers)
|
|
|
|
{
|
|
|
|
struct ie_rsn_info ie;
|
|
|
|
|
|
|
|
*pairwise_ciphers = 0;
|
|
|
|
*group_ciphers = 0;
|
|
|
|
|
|
|
|
if (bss->rsne) {
|
|
|
|
int res = ie_parse_rsne_from_data(bss->rsne, bss->rsne[1] + 2,
|
|
|
|
&ie);
|
|
|
|
if (res < 0) {
|
|
|
|
l_debug("Cannot parse RSN field (%d, %s)",
|
|
|
|
res, strerror(-res));
|
|
|
|
return;
|
|
|
|
}
|
|
|
|
} else if (bss->wpa) {
|
|
|
|
int res = ie_parse_wpa_from_data(bss->wpa, bss->wpa[1] + 2,
|
|
|
|
&ie);
|
|
|
|
if (res < 0) {
|
|
|
|
l_debug("Cannot parse WPA IE (%d, %s)",
|
|
|
|
res, strerror(-res));
|
|
|
|
return;
|
|
|
|
}
|
|
|
|
} else
|
|
|
|
return;
|
|
|
|
|
|
|
|
*pairwise_ciphers = ie.pairwise_ciphers;
|
|
|
|
*group_ciphers = ie.group_cipher;
|
|
|
|
}
|
2015-06-01 16:28:05 +02:00
|
|
|
|
2015-06-16 20:56:03 +02:00
|
|
|
int scan_bss_rank_compare(const void *a, const void *b, void *user_data)
|
|
|
|
{
|
|
|
|
const struct scan_bss *new_bss = a, *bss = b;
|
|
|
|
|
|
|
|
return bss->rank - new_bss->rank;
|
|
|
|
}
|
|
|
|
|
2015-06-01 16:28:05 +02:00
|
|
|
static void get_scan_callback(struct l_genl_msg *msg, void *user_data)
|
|
|
|
{
|
|
|
|
struct scan_results *results = user_data;
|
|
|
|
struct scan_bss *bss;
|
|
|
|
uint32_t ifindex;
|
|
|
|
|
|
|
|
l_debug("get_scan_callback");
|
|
|
|
|
|
|
|
if (!results->bss_list)
|
|
|
|
results->bss_list = l_queue_new();
|
|
|
|
|
|
|
|
bss = scan_parse_result(msg, &ifindex, NULL);
|
|
|
|
if (!bss)
|
|
|
|
return;
|
|
|
|
|
|
|
|
if (ifindex != results->ifindex) {
|
|
|
|
l_warn("ifindex mismatch in get_scan_callback");
|
|
|
|
scan_bss_free(bss);
|
|
|
|
return;
|
|
|
|
}
|
|
|
|
|
2015-06-06 01:18:55 +02:00
|
|
|
scan_bss_compute_rank(bss);
|
2015-06-16 20:56:03 +02:00
|
|
|
l_queue_insert(results->bss_list, bss, scan_bss_rank_compare, NULL);
|
2015-06-01 16:28:05 +02:00
|
|
|
}
|
|
|
|
|
|
|
|
static void get_scan_done(void *user)
|
|
|
|
{
|
|
|
|
struct scan_results *results = user;
|
|
|
|
bool new_owner = false;
|
|
|
|
|
|
|
|
l_debug("get_scan_done");
|
|
|
|
|
|
|
|
if (!results->bss_list)
|
|
|
|
goto done;
|
|
|
|
|
|
|
|
if (notify)
|
|
|
|
new_owner = notify(results->wiphy, results->ifindex,
|
|
|
|
results->bss_list);
|
|
|
|
|
|
|
|
if (!new_owner)
|
|
|
|
l_queue_destroy(results->bss_list,
|
|
|
|
(l_queue_destroy_func_t) scan_bss_free);
|
|
|
|
|
|
|
|
done:
|
2015-06-10 23:24:31 +02:00
|
|
|
if (results->freqs)
|
|
|
|
scan_freq_set_free(results->freqs);
|
|
|
|
|
2015-06-01 16:28:05 +02:00
|
|
|
l_free(results);
|
|
|
|
}
|
|
|
|
|
2015-06-10 23:24:31 +02:00
|
|
|
static void scan_parse_new_scan_results(struct l_genl_msg *msg,
|
|
|
|
struct scan_results *results)
|
|
|
|
{
|
|
|
|
struct l_genl_attr attr, nested;
|
|
|
|
uint16_t type, len;
|
|
|
|
const void *data;
|
|
|
|
|
|
|
|
if (!l_genl_attr_init(&attr, msg))
|
|
|
|
return;
|
|
|
|
|
|
|
|
while (l_genl_attr_next(&attr, &type, &len, &data)) {
|
|
|
|
switch (type) {
|
|
|
|
case NL80211_ATTR_SCAN_FREQUENCIES:
|
|
|
|
if (!l_genl_attr_recurse(&attr, &nested)) {
|
|
|
|
l_warn("Failed to parse ATTR_SCAN_FREQUENCIES");
|
|
|
|
break;
|
|
|
|
}
|
|
|
|
|
|
|
|
results->freqs =
|
|
|
|
scan_parse_attr_scan_frequencies(&nested);
|
|
|
|
break;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
2015-06-01 16:28:05 +02:00
|
|
|
static void scan_notify(struct l_genl_msg *msg, void *user_data)
|
|
|
|
{
|
|
|
|
struct l_genl_attr attr;
|
|
|
|
uint16_t type, len;
|
|
|
|
const void *data;
|
|
|
|
uint8_t cmd;
|
|
|
|
uint32_t uninitialized_var(attr_ifindex);
|
|
|
|
bool have_ifindex;
|
|
|
|
uint32_t uninitialized_var(attr_wiphy);
|
|
|
|
bool have_wiphy;
|
|
|
|
|
|
|
|
cmd = l_genl_msg_get_command(msg);
|
|
|
|
|
|
|
|
l_debug("Scan notification %u", cmd);
|
|
|
|
|
|
|
|
if (!l_genl_attr_init(&attr, msg))
|
|
|
|
return;
|
|
|
|
|
|
|
|
while (l_genl_attr_next(&attr, &type, &len, &data)) {
|
|
|
|
switch (type) {
|
|
|
|
case NL80211_ATTR_WIPHY:
|
|
|
|
if (len != sizeof(uint32_t)) {
|
|
|
|
l_warn("Invalid wiphy attribute");
|
|
|
|
return;
|
|
|
|
}
|
|
|
|
|
|
|
|
have_wiphy = true;
|
|
|
|
attr_wiphy = *((uint32_t *) data);
|
|
|
|
break;
|
|
|
|
case NL80211_ATTR_IFINDEX:
|
|
|
|
if (len != sizeof(uint32_t)) {
|
|
|
|
l_warn("Invalid interface index attribute");
|
|
|
|
return;
|
|
|
|
}
|
|
|
|
|
|
|
|
have_ifindex = true;
|
|
|
|
attr_ifindex = *((uint32_t *) data);
|
|
|
|
break;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
if (!have_wiphy) {
|
|
|
|
l_warn("Scan results do not contain wiphy attribute");
|
|
|
|
return;
|
|
|
|
}
|
|
|
|
|
|
|
|
if (!have_ifindex) {
|
|
|
|
l_warn("Scan results do not contain ifindex attribute");
|
|
|
|
return;
|
|
|
|
}
|
|
|
|
|
|
|
|
if (!notify)
|
|
|
|
return;
|
|
|
|
|
|
|
|
switch (cmd) {
|
|
|
|
case NL80211_CMD_NEW_SCAN_RESULTS:
|
|
|
|
case NL80211_CMD_SCHED_SCAN_RESULTS:
|
|
|
|
{
|
2015-06-10 23:24:31 +02:00
|
|
|
struct l_genl_msg *scan_msg;
|
2015-06-01 16:28:05 +02:00
|
|
|
struct scan_results *results;
|
2015-06-05 05:31:39 +02:00
|
|
|
struct scan_periodic *sp;
|
2015-06-01 16:28:05 +02:00
|
|
|
|
|
|
|
results = l_new(struct scan_results, 1);
|
|
|
|
results->wiphy = attr_wiphy;
|
|
|
|
results->ifindex = attr_ifindex;
|
|
|
|
|
2015-06-10 23:24:31 +02:00
|
|
|
scan_parse_new_scan_results(msg, results);
|
|
|
|
|
|
|
|
scan_msg = l_genl_msg_new_sized(NL80211_CMD_GET_SCAN, 8);
|
|
|
|
l_genl_msg_append_attr(scan_msg, NL80211_ATTR_IFINDEX, 4,
|
2015-06-01 16:28:05 +02:00
|
|
|
&attr_ifindex);
|
2015-06-10 23:24:31 +02:00
|
|
|
l_genl_family_dump(nl80211, scan_msg, get_scan_callback,
|
|
|
|
results, get_scan_done);
|
2015-06-05 05:31:39 +02:00
|
|
|
|
|
|
|
sp = l_queue_find(periodic_scans, scan_periodic_match,
|
|
|
|
L_UINT_TO_PTR(attr_ifindex));
|
|
|
|
if (sp) {
|
|
|
|
if (!sp->triggered) {
|
|
|
|
l_debug("Resetting periodic timeout");
|
|
|
|
sp->interval = SCAN_INIT_INTERVAL;
|
|
|
|
}
|
|
|
|
|
|
|
|
scan_periodic_rearm(sp);
|
|
|
|
}
|
|
|
|
|
2015-06-01 16:28:05 +02:00
|
|
|
return;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
2015-06-10 22:31:13 +02:00
|
|
|
uint8_t scan_freq_to_channel(uint32_t freq, enum scan_band *out_band)
|
|
|
|
{
|
|
|
|
uint32_t channel = 0;
|
|
|
|
|
|
|
|
if (freq >= 2412 && freq <= 2484) {
|
|
|
|
if (freq == 2484)
|
|
|
|
channel = 14;
|
|
|
|
else {
|
|
|
|
channel = freq - 2407;
|
|
|
|
|
|
|
|
if (channel % 5)
|
|
|
|
return 0;
|
|
|
|
|
|
|
|
channel /= 5;
|
|
|
|
}
|
|
|
|
|
|
|
|
if (out_band)
|
|
|
|
*out_band = SCAN_BAND_2_4_GHZ;
|
|
|
|
|
|
|
|
return channel;
|
|
|
|
}
|
|
|
|
|
|
|
|
if (freq >= 5005 && freq < 5900) {
|
|
|
|
if (channel % 5)
|
|
|
|
return 0;
|
|
|
|
|
|
|
|
channel = (freq - 5000) / 5;
|
|
|
|
|
|
|
|
if (out_band)
|
|
|
|
*out_band = SCAN_BAND_5_GHZ;
|
|
|
|
|
|
|
|
return channel;
|
|
|
|
}
|
|
|
|
|
|
|
|
if (freq >= 4905 && freq < 5000) {
|
|
|
|
if (channel % 5)
|
|
|
|
return 0;
|
|
|
|
|
|
|
|
channel = (freq - 4000) / 5;
|
|
|
|
|
|
|
|
if (out_band)
|
|
|
|
*out_band = SCAN_BAND_5_GHZ;
|
|
|
|
|
|
|
|
return channel;
|
|
|
|
}
|
|
|
|
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
2015-06-10 23:24:06 +02:00
|
|
|
struct scan_freq_set {
|
|
|
|
uint16_t channels_2ghz;
|
|
|
|
struct l_uintset *channels_5ghz;
|
|
|
|
};
|
|
|
|
|
|
|
|
struct scan_freq_set *scan_freq_set_new(void)
|
|
|
|
{
|
|
|
|
struct scan_freq_set *ret = l_new(struct scan_freq_set, 1);
|
|
|
|
|
|
|
|
/* 802.11-2012, 8.4.2.10 hints that 200 is the largest channel number */
|
|
|
|
ret->channels_5ghz = l_uintset_new_from_range(1, 200);
|
|
|
|
|
|
|
|
return ret;
|
|
|
|
}
|
|
|
|
|
|
|
|
void scan_freq_set_free(struct scan_freq_set *freqs)
|
|
|
|
{
|
2015-06-10 23:24:31 +02:00
|
|
|
l_uintset_free(freqs->channels_5ghz);
|
2015-06-10 23:24:06 +02:00
|
|
|
l_free(freqs);
|
|
|
|
}
|
|
|
|
|
|
|
|
bool scan_freq_set_add(struct scan_freq_set *freqs, uint32_t freq)
|
|
|
|
{
|
|
|
|
enum scan_band band;
|
|
|
|
uint8_t channel;
|
|
|
|
|
|
|
|
channel = scan_freq_to_channel(freq, &band);
|
|
|
|
if (!channel)
|
|
|
|
return false;
|
|
|
|
|
|
|
|
switch (band) {
|
|
|
|
case SCAN_BAND_2_4_GHZ:
|
|
|
|
freqs->channels_2ghz |= 1 << (channel - 1);
|
|
|
|
return true;
|
|
|
|
case SCAN_BAND_5_GHZ:
|
|
|
|
return l_uintset_put(freqs->channels_5ghz, channel);
|
|
|
|
}
|
|
|
|
|
|
|
|
return false;
|
|
|
|
}
|
|
|
|
|
|
|
|
bool scan_freq_set_contains(struct scan_freq_set *freqs, uint32_t freq)
|
|
|
|
{
|
|
|
|
enum scan_band band;
|
|
|
|
uint8_t channel;
|
|
|
|
|
|
|
|
channel = scan_freq_to_channel(freq, &band);
|
|
|
|
if (!channel)
|
|
|
|
return false;
|
|
|
|
|
|
|
|
switch (band) {
|
|
|
|
case SCAN_BAND_2_4_GHZ:
|
|
|
|
return freqs->channels_2ghz & (1 << (channel - 1));
|
|
|
|
case SCAN_BAND_5_GHZ:
|
|
|
|
return l_uintset_contains(freqs->channels_5ghz, channel);
|
|
|
|
}
|
|
|
|
|
|
|
|
return false;
|
|
|
|
}
|
|
|
|
|
2015-06-01 16:28:05 +02:00
|
|
|
bool scan_init(struct l_genl_family *in, scan_notify_func_t func)
|
|
|
|
{
|
|
|
|
nl80211 = in;
|
|
|
|
scan_id = l_genl_family_register(nl80211, "scan", scan_notify,
|
|
|
|
NULL, NULL);
|
|
|
|
|
|
|
|
if (!scan_id) {
|
|
|
|
l_error("Registering for scan notification failed");
|
|
|
|
return false;
|
|
|
|
}
|
|
|
|
|
|
|
|
notify = func;
|
2015-06-05 05:31:39 +02:00
|
|
|
periodic_scans = l_queue_new();
|
2015-06-01 16:28:05 +02:00
|
|
|
|
|
|
|
return true;
|
|
|
|
}
|
|
|
|
|
2015-06-10 23:34:28 +02:00
|
|
|
bool scan_exit()
|
2015-06-01 16:28:05 +02:00
|
|
|
{
|
2015-06-05 05:31:39 +02:00
|
|
|
bool r;
|
|
|
|
|
2015-06-01 16:28:05 +02:00
|
|
|
if (!nl80211)
|
|
|
|
return false;
|
|
|
|
|
|
|
|
notify = NULL;
|
2015-06-05 05:31:39 +02:00
|
|
|
l_queue_destroy(periodic_scans,
|
|
|
|
(l_queue_destroy_func_t) scan_periodic_free);
|
|
|
|
periodic_scans = NULL;
|
|
|
|
|
|
|
|
r = l_genl_family_unregister(nl80211, scan_id);
|
|
|
|
scan_id = 0;
|
2015-06-01 16:28:05 +02:00
|
|
|
|
2015-06-05 05:31:39 +02:00
|
|
|
return r;
|
2015-06-01 16:28:05 +02:00
|
|
|
}
|