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e83070e074
iwd/src/scan.c
James Prestwood e83070e074 scan: filter user-disabled bands for periodic scans. 
To support user-disabled bands periodic scans need to specify a
frequency list filtered by any bands that are disabled. This was
needed in scan.c since periodic scans don't provide a frequency
list in the scan request.

If no bands are disabled the allowed freqs API should still
result in the same scan behavior as if a frequency list is left
out i.e. IWD just filters the frequencies as opposed to the kernel.
2023-09-29 10:10:33 -05:00

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/*
*
* Wireless daemon for Linux
*
* Copyright (C) 2015-2019 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
#define _GNU_SOURCE
#include <stdlib.h>
#include <stdio.h>
#include <errno.h>
#include <time.h>
#include <sys/socket.h>
#include <limits.h>
#include <linux/if.h>
#include <linux/if_ether.h>
#include <ell/ell.h>
#include "ell/useful.h"
#include "linux/nl80211.h"
#include "src/iwd.h"
#include "src/module.h"
#include "src/wiphy.h"
#include "src/ie.h"
#include "src/common.h"
#include "src/network.h"
#include "src/knownnetworks.h"
#include "src/nl80211cmd.h"
#include "src/nl80211util.h"
#include "src/util.h"
#include "src/p2putil.h"
#include "src/mpdu.h"
#include "src/band.h"
#include "src/scan.h"
/* User configurable options */
static double RANK_2G_FACTOR;
static double RANK_5G_FACTOR;
static double RANK_6G_FACTOR;
static uint32_t SCAN_MAX_INTERVAL;
static uint32_t SCAN_INIT_INTERVAL;
static struct l_queue *scan_contexts;
static struct l_genl_family *nl80211;
struct scan_context;
struct scan_periodic {
struct l_timeout *timeout;
uint16_t interval;
scan_trigger_func_t trigger;
scan_notify_func_t callback;
void *userdata;
uint32_t id;
bool needs_active_scan:1;
};
struct scan_request {
struct scan_context *sc;
scan_trigger_func_t trigger;
scan_notify_func_t callback;
void *userdata;
scan_destroy_func_t destroy;
bool canceled : 1; /* Is scan_cancel being called on this request? */
bool passive:1; /* Active or Passive scan? */
bool started : 1; /* Has TRIGGER_SCAN succeeded at least once? */
/*
* Set to true if the TRIGGER_SCAN command at the head of the 'cmds'
* queue was acked by the kernel indicating that the scan request was
* successful. May be set and cleared multiple times during a
* the scan_request lifetime (as each command in the 'cmds' queue is
* issued to the kernel). Will be false if the current request
* was not started due to an -EBUSY error from the kernel. Also will
* be false when the scan is complete and GET_SCAN is pending.
*/
bool triggered : 1;
bool in_callback : 1; /* Scan request complete, re-entrancy guard */
/* The request was split anticipating 6GHz will become available */
bool split : 1;
struct l_queue *cmds;
/* The time the current scan was started. Reported in TRIGGER_SCAN */
uint64_t start_time_tsf;
struct wiphy_radio_work_item work;
/*
* List of frequencies scanned so far. Since the NEW_SCAN_RESULTS event
* contains frequencies of only the last CMD_TRIGGER we need to parse
* and save these since there may be additional scan commands to run.
*/
struct scan_freq_set *freqs_scanned;
/* Entire list of frequencies to scan */
struct scan_freq_set *scan_freqs;
};
struct scan_context {
uint64_t wdev_id;
uint32_t wiphy_watch_id;
/*
* Tells us whether a scan, our own or external, is running.
* Set when scan gets triggered, cleared when scan done and
* before actual results are queried.
*/
enum scan_state state;
struct scan_periodic sp;
struct l_queue *requests;
/* Non-zero if SCAN_TRIGGER is still running */
unsigned int start_cmd_id;
/* Non-zero if GET_SCAN is still running */
unsigned int get_scan_cmd_id;
/*
* Special request used for getting scan results after the firmware
* roamed automatically.
*/
unsigned int get_fw_scan_cmd_id;
struct wiphy *wiphy;
};
struct scan_results {
struct scan_context *sc;
struct l_queue *bss_list;
uint64_t time_stamp;
struct scan_request *sr;
struct scan_freq_set *freqs;
};
static bool start_next_scan_request(struct wiphy_radio_work_item *item);
static void scan_periodic_rearm(struct scan_context *sc);
static bool scan_context_match(const void *a, const void *b)
{
const struct scan_context *sc = a;
const uint64_t *wdev_id = b;
return sc->wdev_id == *wdev_id;
}
static bool scan_request_match(const void *a, const void *b)
{
const struct scan_request *sr = a;
uint32_t id = L_PTR_TO_UINT(b);
return sr->work.id == id;
}
static void scan_request_free(struct wiphy_radio_work_item *item)
{
struct scan_request *sr = l_container_of(item, struct scan_request,
work);
if (sr->destroy)
sr->destroy(sr->userdata);
l_queue_destroy(sr->cmds, (l_queue_destroy_func_t) l_genl_msg_unref);
scan_freq_set_free(sr->freqs_scanned);
scan_freq_set_free(sr->scan_freqs);
l_free(sr);
}
static void scan_request_failed(struct scan_context *sc,
struct scan_request *sr, int err)
{
sr->in_callback = true;
if (sr->trigger)
sr->trigger(err, sr->userdata);
else if (sr->callback)
sr->callback(err, NULL, NULL, sr->userdata);
sr->in_callback = false;
l_queue_remove(sc->requests, sr);
wiphy_radio_work_done(sc->wiphy, sr->work.id);
}
static void scan_request_cancel(void *data)
{
struct scan_request *sr = data;
wiphy_radio_work_done(sr->sc->wiphy, sr->work.id);
}
static void scan_context_free(struct scan_context *sc)
{
l_debug("sc: %p", sc);
l_queue_destroy(sc->requests, scan_request_cancel);
if (sc->sp.timeout)
l_timeout_remove(sc->sp.timeout);
if (sc->start_cmd_id && nl80211)
l_genl_family_cancel(nl80211, sc->start_cmd_id);
if (sc->get_scan_cmd_id && nl80211)
l_genl_family_cancel(nl80211, sc->get_scan_cmd_id);
if (sc->get_fw_scan_cmd_id && nl80211)
l_genl_family_cancel(nl80211, sc->get_fw_scan_cmd_id);
wiphy_state_watch_remove(sc->wiphy, sc->wiphy_watch_id);
l_free(sc);
}
static void scan_request_triggered(struct l_genl_msg *msg, void *userdata)
{
struct scan_context *sc = userdata;
struct scan_request *sr = l_queue_peek_head(sc->requests);
int err;
sc->start_cmd_id = 0;
err = l_genl_msg_get_error(msg);
if (err < 0) {
/* Scan in progress, assume another scan is running */
if (err == -EBUSY) {
sc->state = SCAN_STATE_PASSIVE;
return;
}
scan_request_failed(sc, sr, err);
l_error("Received error during CMD_TRIGGER_SCAN: %s (%d)",
strerror(-err), -err);
return;
}
sc->state = sr->passive ? SCAN_STATE_PASSIVE : SCAN_STATE_ACTIVE;
l_debug("%s scan triggered for wdev %" PRIx64,
sr->passive ? "Passive" : "Active", sc->wdev_id);
sr->triggered = true;
sr->started = true;
l_genl_msg_unref(l_queue_pop_head(sr->cmds));
if (sr->trigger) {
sr->trigger(0, sr->userdata);
/*
* Reset callback for the consequent scan triggerings of the
* multi-segmented scans.
*/
sr->trigger = NULL;
}
}
struct scan_freq_append_data {
struct l_genl_msg *msg;
int count;
};
static void scan_freq_append(uint32_t freq, void *user_data)
{
struct scan_freq_append_data *data = user_data;
l_genl_msg_append_attr(data->msg, data->count++, 4, &freq);
}
static void scan_build_attr_scan_frequencies(struct l_genl_msg *msg,
const struct scan_freq_set *freqs)
{
struct scan_freq_append_data append_data = { msg, 0 };
l_genl_msg_enter_nested(msg, NL80211_ATTR_SCAN_FREQUENCIES);
scan_freq_set_foreach(freqs, scan_freq_append, &append_data);
l_genl_msg_leave_nested(msg);
}
static void scan_build_attr_ie(struct l_genl_msg *msg,
struct scan_context *sc,
const struct scan_parameters *params)
{
struct iovec iov[3];
unsigned int iov_elems = 0;
const uint8_t *ext_capa;
uint8_t interworking[3];
ext_capa = wiphy_get_extended_capabilities(sc->wiphy,
NL80211_IFTYPE_STATION);
/*
* If adding IE's here ensure that ordering is not broken for
* probe requests (IEEE Std 802.11-2016 Table 9-33).
*/
/* Order 9 - Extended Capabilities */
iov[iov_elems].iov_base = (void *) ext_capa;
iov[iov_elems].iov_len = ext_capa[1] + 2;
iov_elems++;
if (test_bit(&ext_capa[2 + 3], 7)) {
/* Order 12 - Interworking */
interworking[0] = IE_TYPE_INTERWORKING;
interworking[1] = 1;
/* Private network, INet=0,ASRA=0,ESR=0,UESA=0 */
interworking[2] = 0;
iov[iov_elems].iov_base = interworking;
iov[iov_elems].iov_len = 3;
iov_elems++;
}
/* Order Last (assuming WSC vendor specific) */
if (params->extra_ie && params->extra_ie_size) {
iov[iov_elems].iov_base = (void *) params->extra_ie;
iov[iov_elems].iov_len = params->extra_ie_size;
iov_elems++;
}
l_genl_msg_append_attrv(msg, NL80211_ATTR_IE, iov, iov_elems);
}
static bool scan_mac_address_randomization_is_disabled(void)
{
const struct l_settings *config = iwd_get_config();
bool disabled;
if (!l_settings_get_bool(config, "Scan",
"DisableMacAddressRandomization",
&disabled))
return false;
return disabled;
}
static struct l_genl_msg *scan_build_cmd(struct scan_context *sc,
bool ignore_flush_flag, bool is_passive,
const struct scan_parameters *params,
const struct scan_freq_set *freqs)
{
struct l_genl_msg *msg;
uint32_t flags = 0;
msg = l_genl_msg_new(NL80211_CMD_TRIGGER_SCAN);
l_genl_msg_append_attr(msg, NL80211_ATTR_WDEV, 8, &sc->wdev_id);
if (wiphy_get_max_scan_ie_len(sc->wiphy))
scan_build_attr_ie(msg, sc, params);
if (freqs)
scan_build_attr_scan_frequencies(msg, freqs);
if (params->flush && !ignore_flush_flag && wiphy_has_feature(sc->wiphy,
NL80211_FEATURE_SCAN_FLUSH))
flags |= NL80211_SCAN_FLAG_FLUSH;
if (!is_passive && params->randomize_mac_addr_hint &&
wiphy_can_randomize_mac_addr(sc->wiphy) &&
!scan_mac_address_randomization_is_disabled())
/*
* Randomizing 46 bits (locally administered 1 and multicast 0
* is assumed).
*/
flags |= NL80211_SCAN_FLAG_RANDOM_ADDR;
if (!is_passive && params->source_mac &&
wiphy_can_randomize_mac_addr(sc->wiphy)) {
static const uint8_t mask[6] = /* No random bits */
{ 0xff, 0xff, 0xff, 0xff, 0xff, 0xff };
flags |= NL80211_SCAN_FLAG_RANDOM_ADDR;
l_genl_msg_append_attr(msg, NL80211_ATTR_MAC, 6,
params->source_mac);
l_genl_msg_append_attr(msg, NL80211_ATTR_MAC_MASK, 6,
mask);
}
if (!is_passive && wiphy_has_ext_feature(sc->wiphy,
NL80211_EXT_FEATURE_SCAN_RANDOM_SN))
flags |= NL80211_SCAN_FLAG_RANDOM_SN;
if (params->ap_scan)
flags |= NL80211_SCAN_FLAG_AP;
flags |= NL80211_SCAN_FLAG_COLOCATED_6GHZ;
if (flags)
l_genl_msg_append_attr(msg, NL80211_ATTR_SCAN_FLAGS, 4, &flags);
if (params->no_cck_rates) {
static const uint8_t b_rates[] = { 2, 4, 11, 22 };
uint8_t *scan_rates;
const uint8_t *supported;
unsigned int num_supported;
unsigned int count;
unsigned int i;
l_genl_msg_append_attr(msg, NL80211_ATTR_TX_NO_CCK_RATE, 0,
NULL);
/*
* Assume if we're sending the probe requests at OFDM bit
* rates we don't want to advertise support for 802.11b rates.
*/
if (L_WARN_ON(!(supported = wiphy_get_supported_rates(sc->wiphy,
BAND_FREQ_2_4_GHZ,
&num_supported))))
goto done;
scan_rates = l_malloc(num_supported);
for (count = 0, i = 0; i < num_supported; i++)
if (!memchr(b_rates, supported[i],
L_ARRAY_SIZE(b_rates)))
scan_rates[count++] = supported[i];
if (L_WARN_ON(!count)) {
l_free(scan_rates);
goto done;
}
l_genl_msg_enter_nested(msg, NL80211_ATTR_SCAN_SUPP_RATES);
l_genl_msg_append_attr(msg, NL80211_BAND_2GHZ,
count, scan_rates);
l_genl_msg_leave_nested(msg);
l_free(scan_rates);
}
if (wiphy_has_ext_feature(sc->wiphy,
NL80211_EXT_FEATURE_SET_SCAN_DWELL)) {
if (params->duration)
l_genl_msg_append_attr(msg,
NL80211_ATTR_MEASUREMENT_DURATION,
2, &params->duration);
if (params->duration_mandatory)
l_genl_msg_append_attr(msg,
NL80211_ATTR_MEASUREMENT_DURATION_MANDATORY,
0, NULL);
}
done:
return msg;
}
struct l_genl_msg *scan_build_trigger_scan_bss(uint32_t ifindex,
struct wiphy *wiphy,
uint32_t frequency,
const uint8_t *ssid,
uint32_t ssid_len)
{
struct l_genl_msg *msg = l_genl_msg_new(NL80211_CMD_TRIGGER_SCAN);
uint32_t flags = 0;
l_genl_msg_append_attr(msg, NL80211_ATTR_IFINDEX, 4, &ifindex);
l_genl_msg_enter_nested(msg, NL80211_ATTR_SCAN_FREQUENCIES);
l_genl_msg_append_attr(msg, 0, 4, &frequency);
l_genl_msg_leave_nested(msg);
if (wiphy_has_ext_feature(wiphy, NL80211_EXT_FEATURE_SCAN_RANDOM_SN))
flags |= NL80211_SCAN_FLAG_RANDOM_SN;
if (flags)
l_genl_msg_append_attr(msg, NL80211_ATTR_SCAN_FLAGS, 4, &flags);
/* direct probe request scan */
l_genl_msg_enter_nested(msg, NL80211_ATTR_SCAN_SSIDS);
l_genl_msg_append_attr(msg, 0, ssid_len, ssid);
l_genl_msg_leave_nested(msg);
return msg;
}
struct scan_cmds_add_data {
struct scan_context *sc;
const struct scan_parameters *params;
struct l_queue *cmds;
struct l_genl_msg **cmd;
uint8_t max_ssids_per_scan;
uint8_t num_ssids_can_append;
};
static bool scan_cmds_add_hidden(const struct network_info *network,
void *user_data)
{
struct scan_cmds_add_data *data = user_data;
if (!network->config.is_hidden)
return true;
l_genl_msg_append_attr(*data->cmd, NL80211_ATTR_SSID,
strlen(network->ssid), network->ssid);
data->num_ssids_can_append--;
if (!data->num_ssids_can_append) {
l_genl_msg_leave_nested(*data->cmd);
l_queue_push_tail(data->cmds, *data->cmd);
data->num_ssids_can_append = data->max_ssids_per_scan;
/*
* Create a consecutive scan trigger in the batch of scans.
* The 'flush' flag is ignored, this allows to get the results
* of all scans in the batch after the last scan is finished.
*/
*data->cmd = scan_build_cmd(data->sc, true, false,
data->params,
data->params->freqs);
l_genl_msg_enter_nested(*data->cmd, NL80211_ATTR_SCAN_SSIDS);
}
return true;
}
static void scan_build_next_cmd(struct l_queue *cmds, struct scan_context *sc,
bool passive,
const struct scan_parameters *params,
const struct scan_freq_set *freqs)
{
struct l_genl_msg *cmd;
struct scan_cmds_add_data data = {
sc,
params,
cmds,
&cmd,
wiphy_get_max_num_ssids_per_scan(sc->wiphy),
};
cmd = scan_build_cmd(sc, false, passive, params, freqs);
if (passive) {
/* passive scan */
l_queue_push_tail(cmds, cmd);
return;
}
l_genl_msg_enter_nested(cmd, NL80211_ATTR_SCAN_SSIDS);
if (params->ssid) {
/* direct probe request scan */
l_genl_msg_append_attr(cmd, NL80211_ATTR_SSID,
params->ssid_len, params->ssid);
l_genl_msg_leave_nested(cmd);
l_queue_push_tail(cmds, cmd);
return;
}
data.num_ssids_can_append = data.max_ssids_per_scan;
known_networks_foreach(scan_cmds_add_hidden, &data);
l_genl_msg_append_attr(cmd, NL80211_ATTR_SSID, 0, NULL);
l_genl_msg_leave_nested(cmd);
l_queue_push_tail(cmds, cmd);
}
static void scan_cmds_add(struct scan_request *sr, struct scan_context *sc,
bool passive,
const struct scan_parameters *params)
{
uint32_t bands = BAND_FREQ_2_4_GHZ | BAND_FREQ_5_GHZ | BAND_FREQ_6_GHZ;
unsigned int i;
struct scan_freq_set *subsets[2] = { 0 };
_auto_(scan_freq_set_free) struct scan_freq_set *allowed =
wiphy_get_allowed_freqs(sc->wiphy, bands);
const struct scan_freq_set *supported =
wiphy_get_supported_freqs(sc->wiphy);
/*
* No frequencies, just include the entire supported list and let the
* kernel filter out any disabled frequencies
*/
if (!params->freqs)
sr->scan_freqs = scan_freq_set_clone(supported, bands);
else
sr->scan_freqs = scan_freq_set_clone(params->freqs, bands);
/* If 6GHz is not possible or already allowed don't split the request */
if (!(scan_freq_set_get_bands(supported) & BAND_FREQ_6_GHZ) ||
(scan_freq_set_get_bands(allowed) & BAND_FREQ_6_GHZ)) {
scan_build_next_cmd(sr->cmds, sc, passive,
params, sr->scan_freqs);
return;
}
/*
* Otherwise a full spectrum scan will likely open up the 6GHz
* band. The problem is the regdom update occurs after an
* individual scan request so a single request isn't going to
* include potential 6GHz results.
*
* Instead we can break this full scan up into individual bands
* and increase our chances of the regdom updating after one of
* the earlier requests. If it does update to allow 6GHz an
* extra 6GHz-only passive scan can be appended to this request
* at that time.
*/
subsets[0] = scan_freq_set_clone(sr->scan_freqs, BAND_FREQ_2_4_GHZ);
subsets[1] = scan_freq_set_clone(sr->scan_freqs, BAND_FREQ_5_GHZ);
for(i = 0; i < L_ARRAY_SIZE(subsets); i++) {
if (!scan_freq_set_isempty(subsets[i]))
scan_build_next_cmd(sr->cmds, sc, passive, params,
subsets[i]);
scan_freq_set_free(subsets[i]);
}
sr->split = true;
}
static int scan_request_send_trigger(struct scan_context *sc,
struct scan_request *sr)
{
struct l_genl_msg *cmd = l_queue_peek_head(sr->cmds);
if (!cmd)
return -ENOMSG;
sc->start_cmd_id = l_genl_family_send(nl80211, cmd,
scan_request_triggered, sc,
NULL);
if (sc->start_cmd_id) {
l_genl_msg_ref(cmd);
return 0;
}
l_error("Scan request: failed to trigger scan.");
return -EIO;
}
static const struct wiphy_radio_work_item_ops work_ops = {
.do_work = start_next_scan_request,
.destroy = scan_request_free,
};
static struct scan_request *scan_request_new(struct scan_context *sc,
bool passive,
scan_trigger_func_t trigger,
scan_notify_func_t notify,
void *userdata,
scan_destroy_func_t destroy)
{
struct scan_request *sr;
sr = l_new(struct scan_request, 1);
sr->sc = sc;
sr->trigger = trigger;
sr->callback = notify;
sr->userdata = userdata;
sr->destroy = destroy;
sr->passive = passive;
sr->cmds = l_queue_new();
sr->freqs_scanned = scan_freq_set_new();
return sr;
}
static int insert_by_priority(const void *a, const void *b, void *user_data)
{
const struct scan_request *cur = b;
int priority = L_PTR_TO_INT(user_data);
if (cur->work.priority <= priority)
return 1;
return -1;
}
static uint32_t scan_common(uint64_t wdev_id, bool passive,
const struct scan_parameters *params,
int priority,
scan_trigger_func_t trigger,
scan_notify_func_t notify, void *userdata,
scan_destroy_func_t destroy)
{
struct scan_context *sc;
struct scan_request *sr;
sc = l_queue_find(scan_contexts, scan_context_match, &wdev_id);
if (!sc)
return 0;
sr = scan_request_new(sc, passive, trigger, notify, userdata, destroy);
scan_cmds_add(sr, sc, passive, params);
/*
* sr->work isn't initialized yet, it will be done by
* wiphy_radio_work_insert(). Pass the priority as user_data instead
*/
l_queue_insert(sc->requests, sr, insert_by_priority,
L_INT_TO_PTR(priority));
return wiphy_radio_work_insert(sc->wiphy, &sr->work,
priority, &work_ops);
}
uint32_t scan_passive(uint64_t wdev_id, const struct scan_freq_set *freqs,
scan_trigger_func_t trigger, scan_notify_func_t notify,
void *userdata, scan_destroy_func_t destroy)
{
struct scan_parameters params = { .freqs = freqs };
return scan_common(wdev_id, true, &params, WIPHY_WORK_PRIORITY_SCAN,
trigger, notify, userdata, destroy);
}
uint32_t scan_passive_full(uint64_t wdev_id,
const struct scan_parameters *params,
scan_trigger_func_t trigger,
scan_notify_func_t notify, void *userdata,
scan_destroy_func_t destroy)
{
return scan_common(wdev_id, true, params, WIPHY_WORK_PRIORITY_SCAN,
trigger, notify, userdata, destroy);
}
uint32_t scan_active(uint64_t wdev_id, uint8_t *extra_ie, size_t extra_ie_size,
scan_trigger_func_t trigger,
scan_notify_func_t notify, void *userdata,
scan_destroy_func_t destroy)
{
struct scan_parameters params = {};
params.extra_ie = extra_ie;
params.extra_ie_size = extra_ie_size;
return scan_common(wdev_id, false, &params, WIPHY_WORK_PRIORITY_SCAN,
trigger, notify, userdata, destroy);
}
uint32_t scan_active_full(uint64_t wdev_id,
const struct scan_parameters *params,
scan_trigger_func_t trigger, scan_notify_func_t notify,
void *userdata, scan_destroy_func_t destroy)
{
return scan_common(wdev_id, false, params, WIPHY_WORK_PRIORITY_SCAN,
trigger, notify, userdata, destroy);
}
static void scan_add_owe_freq(struct scan_freq_set *freqs,
const struct scan_bss *bss)
{
int freq;
if (bss->owe_trans->oper_class)
freq = oci_to_frequency(bss->owe_trans->oper_class,
bss->owe_trans->channel);
else
freq = bss->frequency;
L_WARN_ON(freq < 0);
scan_freq_set_add(freqs, freq);
}
static void add_owe_scan_cmd(struct scan_context *sc, struct scan_request *sr,
bool ignore_flush,
struct scan_freq_set *freqs,
const struct scan_bss *bss)
{
struct l_genl_msg *cmd;
struct scan_parameters params = {};
struct scan_freq_set *tmp;
if (!freqs) {
tmp = scan_freq_set_new();
scan_add_owe_freq(tmp, bss);
params.freqs = tmp;
} else
params.freqs = freqs;
params.ssid = bss->owe_trans->ssid;
params.ssid_len = bss->owe_trans->ssid_len;
params.flush = true;
cmd = scan_build_cmd(sc, ignore_flush, false, &params, params.freqs);
l_genl_msg_enter_nested(cmd, NL80211_ATTR_SCAN_SSIDS);
l_genl_msg_append_attr(cmd, 0, params.ssid_len, params.ssid);
l_genl_msg_leave_nested(cmd);
l_queue_push_tail(sr->cmds, cmd);
if (!freqs)
scan_freq_set_free(tmp);
}
uint32_t scan_owe_hidden(uint64_t wdev_id, struct l_queue *list,
scan_trigger_func_t trigger, scan_notify_func_t notify,
void *userdata, scan_destroy_func_t destroy)
{
struct scan_context *sc;
struct scan_request *sr;
struct scan_freq_set *freqs;
const struct l_queue_entry *entry;
const uint8_t *ssid = NULL;
size_t ssid_len;
bool same_ssid = true;
struct scan_bss *bss;
bool ignore_flush = false;
sc = l_queue_find(scan_contexts, scan_context_match, &wdev_id);
if (!sc)
return 0;
sr = scan_request_new(sc, false, trigger, notify, userdata, destroy);
freqs = scan_freq_set_new();
/*
* Start building up a frequency list if all SSIDs are the same. This
* is hopefully the common case and will allow a single scan command.
*/
for (entry = l_queue_get_entries(list); entry; entry = entry->next) {
bss = entry->data;
scan_add_owe_freq(freqs, bss);
/* First */
if (!ssid) {
ssid = bss->owe_trans->ssid;
ssid_len = bss->owe_trans->ssid_len;
continue;
}
if (ssid_len == bss->owe_trans->ssid_len &&
!memcmp(ssid, bss->owe_trans->ssid,
bss->owe_trans->ssid_len))
continue;
same_ssid = false;
break;
}
if (same_ssid) {
bss = l_queue_peek_head(list);
add_owe_scan_cmd(sc, sr, ignore_flush, freqs, bss);
scan_freq_set_free(freqs);
goto done;
}
scan_freq_set_free(freqs);
/* SSIDs differed, use separate scan commands. */
for (entry = l_queue_get_entries(list); entry; entry = entry->next) {
bss = entry->data;
add_owe_scan_cmd(sc, sr, ignore_flush, NULL, bss);
/* Ignore flush on all subsequent commands */
if (!ignore_flush)
ignore_flush = true;
}
done:
l_queue_insert(sc->requests, sr, insert_by_priority,
L_INT_TO_PTR(WIPHY_WORK_PRIORITY_SCAN));
return wiphy_radio_work_insert(sc->wiphy, &sr->work,
WIPHY_WORK_PRIORITY_SCAN, &work_ops);
}
bool scan_cancel(uint64_t wdev_id, uint32_t id)
{
struct scan_context *sc;
struct scan_request *sr;
l_debug("Trying to cancel scan id %u for wdev %" PRIx64, id, wdev_id);
sc = l_queue_find(scan_contexts, scan_context_match, &wdev_id);
if (!sc)
return false;
sr = l_queue_find(sc->requests, scan_request_match, L_UINT_TO_PTR(id));
if (!sr)
return false;
/* We're in the callback and about to be removed, invoke destroy now */
if (sr->in_callback)
goto call_destroy;
/* If already triggered, just zero out the callback */
if (sr->triggered) {
l_debug("Scan has been triggered, wait for it to complete");
sr->callback = NULL;
goto call_destroy;
}
/*
* Takes care of the following cases:
* 1. If TRIGGER_SCAN is in flight
* 2. TRIGGER_SCAN sent but bounced with -EBUSY
* 3. Scan request is done but GET_SCAN is still pending
*
* For case 3, we can easily cancel the command and proceed with the
* other pending requests. For case 1 & 2, the subsequent pending
* request might bounce off with an -EBUSY.
*/
if (wiphy_radio_work_is_running(sc->wiphy, sr->work.id)) {
l_debug("Scan is already started");
/* l_genl_family_cancel will trigger destroy callbacks */
sr->canceled = true;
if (sc->start_cmd_id)
l_genl_family_cancel(nl80211, sc->start_cmd_id);
if (sc->get_scan_cmd_id)
l_genl_family_cancel(nl80211, sc->get_scan_cmd_id);
sc->start_cmd_id = 0;
sc->get_scan_cmd_id = 0;
}
l_queue_remove(sc->requests, sr);
wiphy_radio_work_done(sc->wiphy, sr->work.id);
return true;
call_destroy:
if (sr->destroy) {
sr->destroy(sr->userdata);
sr->destroy = NULL;
}
return true;
}
static void scan_periodic_triggered(int err, void *user_data)
{
struct scan_context *sc = user_data;
if (err) {
scan_periodic_rearm(sc);
return;
}
l_debug("Periodic scan triggered for wdev %" PRIx64, sc->wdev_id);
if (sc->sp.trigger)
sc->sp.trigger(0, sc->sp.userdata);
}
static bool scan_periodic_notify(int err, struct l_queue *bss_list,
const struct scan_freq_set *freqs,
void *user_data)
{
struct scan_context *sc = user_data;
scan_periodic_rearm(sc);
if (sc->sp.callback)
return sc->sp.callback(err, bss_list, freqs, sc->sp.userdata);
return false;
}
static void scan_periodic_destroy(void *user_data)
{
struct scan_context *sc = user_data;
sc->sp.id = 0;
}
static struct scan_freq_set *scan_periodic_get_freqs(struct scan_context *sc)
{
uint32_t band_mask = 0;
struct scan_freq_set *freqs;
const struct scan_freq_set *supported =
wiphy_get_supported_freqs(sc->wiphy);
if (RANK_2G_FACTOR)
band_mask |= BAND_FREQ_2_4_GHZ;
if (RANK_5G_FACTOR)
band_mask |= BAND_FREQ_5_GHZ;
if (RANK_6G_FACTOR)
band_mask |= BAND_FREQ_6_GHZ;
freqs = scan_freq_set_clone(supported, band_mask);
if (scan_freq_set_isempty(freqs)) {
scan_freq_set_free(freqs);
freqs = NULL;
}
return freqs;
}
static bool scan_periodic_queue(struct scan_context *sc)
{
struct scan_parameters params = {};
struct scan_freq_set *freqs = scan_periodic_get_freqs(sc);
/*
* If this happens its due to the user disabling all bands. This will
* cause IWD to never issue another periodic scan so warn the user of
* this.
*/
if (L_WARN_ON(!freqs))
return false;
params.freqs = freqs;
if (sc->sp.needs_active_scan && known_networks_has_hidden()) {
params.randomize_mac_addr_hint = true;
sc->sp.needs_active_scan = false;
sc->sp.id = scan_common(sc->wdev_id, false, &params,
WIPHY_WORK_PRIORITY_PERIODIC_SCAN,
scan_periodic_triggered,
scan_periodic_notify, sc,
scan_periodic_destroy);
} else
sc->sp.id = scan_common(sc->wdev_id, true, &params,
WIPHY_WORK_PRIORITY_PERIODIC_SCAN,
scan_periodic_triggered,
scan_periodic_notify, sc,
scan_periodic_destroy);
scan_freq_set_free(freqs);
return sc->sp.id != 0;
}
static bool scan_periodic_is_disabled(void)
{
const struct l_settings *config = iwd_get_config();
bool disabled;
if (!l_settings_get_bool(config, "Scan", "DisablePeriodicScan",
&disabled))
return false;
return disabled;
}
void scan_periodic_start(uint64_t wdev_id, scan_trigger_func_t trigger,
scan_notify_func_t func, void *userdata)
{
struct scan_context *sc;
if (scan_periodic_is_disabled())
return;
sc = l_queue_find(scan_contexts, scan_context_match, &wdev_id);
if (!sc) {
l_error("%s called without scan_wdev_add", __func__);
return;
}
if (sc->sp.interval)
return;
l_debug("Starting periodic scan for wdev %" PRIx64, wdev_id);
sc->sp.interval = SCAN_INIT_INTERVAL;
sc->sp.trigger = trigger;
sc->sp.callback = func;
sc->sp.userdata = userdata;
/* If nothing queued, start the first periodic scan */
scan_periodic_queue(sc);
}
bool scan_periodic_stop(uint64_t wdev_id)
{
struct scan_context *sc;
sc = l_queue_find(scan_contexts, scan_context_match, &wdev_id);
if (!sc)
return false;
if (!sc->sp.interval)
return false;
l_debug("Stopping periodic scan for wdev %" PRIx64, wdev_id);
if (sc->sp.timeout)
l_timeout_remove(sc->sp.timeout);
if (sc->sp.id) {
scan_cancel(wdev_id, sc->sp.id);
sc->sp.id = 0;
}
sc->sp.interval = 0;
sc->sp.trigger = NULL;
sc->sp.callback = NULL;
sc->sp.userdata = NULL;
sc->sp.needs_active_scan = false;
return true;
}
uint64_t scan_get_triggered_time(uint64_t wdev_id, uint32_t id)
{
struct scan_context *sc;
struct scan_request *sr;
sc = l_queue_find(scan_contexts, scan_context_match, &wdev_id);
if (!sc)
return 0;
sr = l_queue_find(sc->requests, scan_request_match, L_UINT_TO_PTR(id));
if (!sr || !sr->triggered)
return 0;
return sr->start_time_tsf;
}
static void scan_periodic_timeout(struct l_timeout *timeout, void *user_data)
{
struct scan_context *sc = user_data;
l_debug("%" PRIx64, sc->wdev_id);
/*
* Timeout triggered before periodic scan could even start, just rearm
* with the same interval.
*/
if (sc->sp.id) {
l_debug("Periodic scan timer called before scan could start!");
scan_periodic_rearm(sc);
return;
}
sc->sp.interval *= 2;
if (sc->sp.interval > SCAN_MAX_INTERVAL)
sc->sp.interval = SCAN_MAX_INTERVAL;
scan_periodic_queue(sc);
}
static void scan_periodic_timeout_destroy(void *user_data)
{
struct scan_context *sc = user_data;
sc->sp.timeout = NULL;
}
static void scan_periodic_rearm(struct scan_context *sc)
{
l_debug("Arming periodic scan timer: %u", sc->sp.interval);
if (sc->sp.timeout)
l_timeout_modify(sc->sp.timeout, sc->sp.interval);
else
sc->sp.timeout = l_timeout_create(sc->sp.interval,
scan_periodic_timeout, sc,
scan_periodic_timeout_destroy);
}
static bool start_next_scan_request(struct wiphy_radio_work_item *item)
{
struct scan_request *sr = l_container_of(item,
struct scan_request, work);
struct scan_context *sc = sr->sc;
if (sc->state != SCAN_STATE_NOT_RUNNING)
return false;
if (!scan_request_send_trigger(sc, sr))
return false;
scan_request_failed(sc, sr, -EIO);
return true;
}
static void scan_parse_vendor_specific(struct scan_bss *bss, const void *data,
uint16_t len)
{
uint16_t cost_level;
uint16_t cost_flags;
bool dgaf_disable;
if (!bss->wpa && is_ie_wpa_ie(data, len)) {
bss->wpa = l_memdup(data - 2, len + 2);
return;
}
if (!bss->osen && is_ie_wfa_ie(data, len, IE_WFA_OI_OSEN)) {
bss->osen = l_memdup(data - 2, len + 2);
return;
}
if (is_ie_wfa_ie(data, len, IE_WFA_OI_HS20_INDICATION)) {
if (ie_parse_hs20_indication_from_data(data - 2, len + 2,
&bss->hs20_version, NULL, NULL,
&dgaf_disable) < 0)
return;
bss->hs20_dgaf_disable = dgaf_disable;
bss->hs20_capable = true;
return;
}
if (is_ie_wfa_ie(data, len, IE_WFA_OI_OWE_TRANSITION)) {
_auto_(l_free) struct ie_owe_transition_info *owe_trans =
l_new(struct ie_owe_transition_info, 1);
if (ie_parse_owe_transition(data - 2, len + 2, owe_trans) < 0)
return;
if (owe_trans->oper_class &&
oci_to_frequency(owe_trans->oper_class,
owe_trans->channel) < 0)
return;
bss->owe_trans = l_steal_ptr(owe_trans);
return;
}
if (is_ie_wfa_ie(data, len, IE_WFA_OI_CONFIGURATOR_CONNECTIVITY))
bss->dpp_configurator = true;
if (!ie_parse_network_cost(data, len, &cost_level, &cost_flags)) {
bss->cost_level = cost_level;
bss->cost_flags = cost_flags;
return;
}
if (is_ie_default_sae_group_oui(data, len))
bss->force_default_sae_group = true;
}
/*
* Fully parses the Advertisement Protocol Element. The only thing being looked
* for is the ANQP protocol ID, but this could be buried behind several other
* advertisement tuples so the entire IE may need to be parsed.
*/
static bool scan_parse_advertisement_protocol(struct scan_bss *bss,
const void *data, uint16_t len)
{
const uint8_t *ptr = data;
while (len) {
/*
* TODO: Store query info for GAS response length verification
*/
uint8_t id = ptr[1];
switch (id) {
/*
* IEEE 802.11-2016 Section 11.25.3.3.1
*
* "A non-AP STA shall not transmit an ANQP request to
* an AP for any ANQP-element unless the ANQP
* Advertisement Protocol ID is included..."
*/
case IE_ADVERTISEMENT_ANQP:
bss->anqp_capable = true;
return true;
case IE_ADVERTISEMENT_MIH_SERVICE:
case IE_ADVERTISEMENT_MIH_DISCOVERY:
case IE_ADVERTISEMENT_EAS:
case IE_ADVERTISEMENT_RLQP:
len -= 2;
ptr += 2;
break;
case IE_ADVERTISEMENT_VENDOR_SPECIFIC:
/* IEEE 802.11-2016 Section 9.4.2.26 */
len -= ptr[3];
ptr += ptr[3];
break;
default:
return false;
}
}
return true;
}
static bool scan_parse_bss_information_elements(struct scan_bss *bss,
const void *data, uint16_t len)
{
struct ie_tlv_iter iter;
bool have_ssid = false;
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;
memcpy(bss->ssid, iter.data, iter.len);
bss->ssid_len = iter.len;
have_ssid = true;
break;
case IE_TYPE_RSN:
if (!bss->rsne)
bss->rsne = l_memdup(iter.data - 2,
iter.len + 2);
break;
case IE_TYPE_RSNX:
if (!bss->rsnxe)
bss->rsnxe = l_memdup(iter.data - 2,
iter.len + 2);
break;
case IE_TYPE_BSS_LOAD:
if (ie_parse_bss_load(&iter, NULL, &bss->utilization,
NULL) < 0)
l_warn("Unable to parse BSS Load IE for "
MAC, MAC_STR(bss->addr));
break;
case IE_TYPE_VENDOR_SPECIFIC:
scan_parse_vendor_specific(bss, iter.data, iter.len);
break;
case IE_TYPE_MOBILITY_DOMAIN:
if (!bss->mde_present && iter.len == 3) {
memcpy(bss->mde, iter.data, iter.len);
bss->mde_present = true;
}
break;
case IE_TYPE_RM_ENABLED_CAPABILITIES:
if (iter.len != 5)
break;
/* Only interested in Neighbor Reports */
bss->cap_rm_neighbor_report =
(iter.data[0] & IE_RM_CAP_NEIGHBOR_REPORT) > 0;
break;
case IE_TYPE_COUNTRY:
if (bss->cc_present || iter.len < 6)
break;
bss->cc[0] = iter.data[0];
bss->cc[1] = iter.data[1];
bss->cc[2] = iter.data[2];
bss->cc_present = true;
break;
case IE_TYPE_HT_CAPABILITIES:
bss->ht_capable = true;
break;
case IE_TYPE_VHT_CAPABILITIES:
bss->vht_capable = true;
break;
case IE_TYPE_ADVERTISEMENT_PROTOCOL:
if (iter.len < 2)
return false;
scan_parse_advertisement_protocol(bss, iter.data,
iter.len);
break;
case IE_TYPE_INTERWORKING:
/*
* No bits indicate if venue/HESSID is included, so the
* length is the only way to know.
* (IEEE 802.11-2016 - Figure 9-439)
*/
if (iter.len == 9)
memcpy(bss->hessid, iter.data + 3, 6);
else if (iter.len == 7)
memcpy(bss->hessid, iter.data + 1, 6);
break;
case IE_TYPE_ROAMING_CONSORTIUM:
if (iter.len < 2)
return false;
bss->rc_ie = l_memdup(iter.data - 2, iter.len + 2);
break;
case IE_TYPE_EXTENDED_CAPABILITIES:
/* 802.11-2020 9.4.2.26
*
* "The length of the Extended Capabilities field is
* variable. If fewer bits are received in an Extended
* Capabilities field than shown in Table 9-153, the
* rest of the Extended Capabilities field bits are
* assumed to be zero"
*
* Currently only Proxy ARP bit (12) is checked, and if
* not found, this is not a fatal error.
*/
if (iter.len < 2)
break;
bss->proxy_arp = test_bit(iter.data, 12);
}
}
bss->wsc = ie_tlv_extract_wsc_payload(data, len, &bss->wsc_size);
switch (bss->source_frame) {
case SCAN_BSS_PROBE_RESP:
bss->p2p_probe_resp_info = l_new(struct p2p_probe_resp, 1);
if (p2p_parse_probe_resp(data, len, bss->p2p_probe_resp_info) ==
0)
break;
l_free(bss->p2p_probe_resp_info);
bss->p2p_probe_resp_info = NULL;
break;
case SCAN_BSS_PROBE_REQ:
bss->p2p_probe_req_info = l_new(struct p2p_probe_req, 1);
if (p2p_parse_probe_req(data, len, bss->p2p_probe_req_info) ==
0)
break;
l_free(bss->p2p_probe_req_info);
bss->p2p_probe_req_info = NULL;
break;
case SCAN_BSS_BEACON:
{
/*
* Beacon and Probe Response P2P IE subelement formats are
* mutually incompatible and can help us distinguish one frame
* subtype from the other if the driver is not exposing enough
* information. As a result of trusting the frame contents on
* this, no critical code should depend on the
* bss->source_frame information being right.
*/
struct p2p_beacon info;
int r;
r = p2p_parse_beacon(data, len, &info);
if (r == 0) {
bss->p2p_beacon_info = l_memdup(&info, sizeof(info));
break;
}
if (r == -ENOENT)
break;
bss->p2p_probe_resp_info = l_new(struct p2p_probe_resp, 1);
if (p2p_parse_probe_resp(data, len, bss->p2p_probe_resp_info) ==
0) {
bss->source_frame = SCAN_BSS_PROBE_RESP;
break;
}
l_free(bss->p2p_probe_resp_info);
bss->p2p_probe_resp_info = NULL;
break;
}
}
bss->wfd = ie_tlv_extract_wfd_payload(data, len, &bss->wfd_size);
return have_ssid;
}
/*
* Maps 0..100 values to -10000..0
*
* This isn't really mapping to mBm since the input is unit-less and we have no
* idea what the driver itself does to come up with this 'strength' value but
* this is really the best that can be done for these drivers (its only 4 in
* tree drivers after all).
*/
static int32_t signal_unspec_to_mbm(uint8_t strength)
{
if (L_WARN_ON(strength > 100))
return 0;
return ((int32_t)strength * 100) - 10000;
}
static struct scan_bss *scan_parse_attr_bss(struct l_genl_attr *attr,
struct wiphy *wiphy,
uint32_t *out_seen_ms_ago)
{
uint16_t type, len;
const void *data;
struct scan_bss *bss;
const uint8_t *ies = NULL;
size_t ies_len;
const uint8_t *beacon_ies = NULL;
size_t beacon_ies_len;
bss = l_new(struct scan_bss, 1);
bss->utilization = 127;
bss->source_frame = SCAN_BSS_BEACON;
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_SIGNAL_UNSPEC:
if (len != 1)
goto fail;
bss->signal_strength =
signal_unspec_to_mbm(l_get_u8(data));
break;
case NL80211_BSS_INFORMATION_ELEMENTS:
ies = data;
ies_len = len;
break;
case NL80211_BSS_PARENT_TSF:
if (len != sizeof(uint64_t))
goto fail;
bss->parent_tsf = l_get_u64(data);
break;
case NL80211_BSS_PRESP_DATA:
bss->source_frame = SCAN_BSS_PROBE_RESP;
break;
case NL80211_BSS_BEACON_IES:
beacon_ies = data;
beacon_ies_len = len;
break;
case NL80211_BSS_SEEN_MS_AGO:
if (L_WARN_ON(len != sizeof(uint32_t)))
break;
*out_seen_ms_ago = l_get_u32(data);
break;
case NL80211_BSS_LAST_SEEN_BOOTTIME:
if (L_WARN_ON(len != sizeof(uint64_t)))
break;
bss->time_stamp = l_get_u64(data) / L_NSEC_PER_USEC;
break;
}
}
/*
* Try our best at deciding whether the IEs come from a Probe
* Response based on the hints explained in nl80211.h
* (enum nl80211_bss).
*/
if (bss->source_frame == SCAN_BSS_BEACON && ies && (
!beacon_ies ||
ies_len != beacon_ies_len ||
memcmp(ies, beacon_ies, ies_len)))
bss->source_frame = SCAN_BSS_PROBE_RESP;
/* Set data rate to something low, just in case estimation fails */
bss->data_rate = 2000000;
if (ies) {
int ret;
if (!scan_parse_bss_information_elements(bss, ies, ies_len))
goto fail;
ret = wiphy_estimate_data_rate(wiphy, ies, ies_len, bss,
&bss->data_rate);
if (ret < 0 && ret != -ENETUNREACH)
l_warn("wiphy_estimate_data_rate() failed");
}
return bss;
fail:
scan_bss_free(bss);
return NULL;
}
static void scan_parse_attr_scan_frequencies(struct l_genl_attr *attr,
struct scan_freq_set *set)
{
uint16_t type, len;
const void *data;
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);
}
}
static struct scan_bss *scan_parse_result(struct l_genl_msg *msg,
struct wiphy *wiphy,
uint32_t *out_seen_ms_ago)
{
struct l_genl_attr attr, nested;
uint16_t type;
struct scan_bss *bss = NULL;
if (!l_genl_attr_init(&attr, msg))
return NULL;
while (l_genl_attr_next(&attr, &type, NULL, NULL)) {
switch (type) {
case NL80211_ATTR_BSS:
if (!l_genl_attr_recurse(&attr, &nested))
return NULL;
bss = scan_parse_attr_bss(&nested, wiphy,
out_seen_ms_ago);
break;
}
}
return bss;
}
static void scan_bss_compute_rank(struct scan_bss *bss)
{
static const double RANK_HIGH_UTILIZATION_FACTOR = 0.8;
static const double RANK_LOW_UTILIZATION_FACTOR = 1.2;
double rank;
uint32_t irank;
/*
* Maximum rate is 9607.8Mbps (HE)
*/
double max_rate = 9607800000;
rank = (double)bss->data_rate / max_rate * USHRT_MAX;
if (bss->frequency < 3000)
rank *= RANK_2G_FACTOR;
/* Prefer 5G networks over 2.4G and 6G */
if (bss->frequency >= 4900 && bss->frequency < 5900)
rank *= RANK_5G_FACTOR;
/* Prefer 6G networks over 2.4G and 5G */
if (bss->frequency >= 5900 && bss->frequency < 7200)
rank *= RANK_6G_FACTOR;
/* Rank loaded APs lower and lightly loaded APs higher */
if (bss->utilization >= 192)
rank *= RANK_HIGH_UTILIZATION_FACTOR;
else if (bss->utilization <= 63)
rank *= RANK_LOW_UTILIZATION_FACTOR;
irank = rank;
if (irank > USHRT_MAX)
bss->rank = USHRT_MAX;
else
bss->rank = irank;
}
struct scan_bss *scan_bss_new_from_probe_req(const struct mmpdu_header *mpdu,
const uint8_t *body,
size_t body_len,
uint32_t frequency, int rssi)
{
struct scan_bss *bss;
bss = l_new(struct scan_bss, 1);
memcpy(bss->addr, mpdu->address_2, 6);
bss->utilization = 127;
bss->source_frame = SCAN_BSS_PROBE_REQ;
bss->frequency = frequency;
bss->signal_strength = rssi;
if (!scan_parse_bss_information_elements(bss, body, body_len))
goto fail;
return bss;
fail:
scan_bss_free(bss);
return NULL;
}
void scan_bss_free(struct scan_bss *bss)
{
l_free(bss->rsne);
l_free(bss->rsnxe);
l_free(bss->wpa);
l_free(bss->wsc);
l_free(bss->osen);
l_free(bss->rc_ie);
l_free(bss->wfd);
l_free(bss->owe_trans);
switch (bss->source_frame) {
case SCAN_BSS_PROBE_RESP:
if (!bss->p2p_probe_resp_info)
break;
p2p_clear_probe_resp(bss->p2p_probe_resp_info);
l_free(bss->p2p_probe_resp_info);
break;
case SCAN_BSS_PROBE_REQ:
if (!bss->p2p_probe_req_info)
break;
p2p_clear_probe_req(bss->p2p_probe_req_info);
l_free(bss->p2p_probe_req_info);
break;
case SCAN_BSS_BEACON:
if (!bss->p2p_beacon_info)
break;
p2p_clear_beacon(bss->p2p_beacon_info);
l_free(bss->p2p_beacon_info);
break;
}
l_free(bss);
}
int scan_bss_get_rsn_info(const struct scan_bss *bss, struct ie_rsn_info *info)
{
/*
* If both an RSN and a WPA elements are present currently
* RSN takes priority and the WPA IE is ignored.
*/
if (bss->rsne) {
int res = ie_parse_rsne_from_data(bss->rsne, bss->rsne[1] + 2,
info);
if (res < 0) {
l_debug("Cannot parse RSN field (%d, %s)",
res, strerror(-res));
return res;
}
} else if (bss->wpa) {
int res = ie_parse_wpa_from_data(bss->wpa, bss->wpa[1] + 2,
info);
if (res < 0) {
l_debug("Cannot parse WPA IE (%d, %s)",
res, strerror(-res));
return res;
}
} else if (bss->osen) {
int res = ie_parse_osen_from_data(bss->osen, bss->osen[1] + 2,
info);
if (res < 0) {
l_debug("Cannot parse OSEN IE (%d, %s)",
res, strerror(-res));
return res;
}
} else
return -ENOENT;
return 0;
}
int scan_bss_get_security(const struct scan_bss *bss, enum security *security)
{
int ret;
struct ie_rsn_info info;
ret = scan_bss_get_rsn_info(bss, &info);
if (ret < 0) {
if (ret != -ENOENT)
return ret;
*security = security_determine(bss->capability, NULL);
} else
*security = security_determine(bss->capability, &info);
return 0;
}
int scan_bss_rank_compare(const void *a, const void *b, void *user_data)
{
const struct scan_bss *new_bss = a, *bss = b;
if (bss->rank == new_bss->rank)
return (bss->signal_strength >
new_bss->signal_strength) ? 1 : -1;
return (bss->rank > new_bss->rank) ? 1 : -1;
}
static void get_scan_callback(struct l_genl_msg *msg, void *user_data)
{
struct scan_results *results = user_data;
struct scan_context *sc = results->sc;
struct scan_bss *bss;
uint64_t wdev_id;
uint32_t seen_ms_ago = 0;
if (nl80211_parse_attrs(msg, NL80211_ATTR_WDEV, &wdev_id,
NL80211_ATTR_UNSPEC) < 0)
return;
if (wdev_id != sc->wdev_id) {
l_warn("wdev mismatch in get_scan_callback");
return;
}
bss = scan_parse_result(msg, sc->wiphy, &seen_ms_ago);
if (!bss)
return;
if (!bss->time_stamp)
bss->time_stamp = results->time_stamp -
seen_ms_ago * L_USEC_PER_MSEC;
scan_bss_compute_rank(bss);
l_queue_insert(results->bss_list, bss, scan_bss_rank_compare, NULL);
}
static void discover_hidden_network_bsses(struct scan_context *sc,
struct l_queue *bss_list)
{
const struct l_queue_entry *bss_entry;
for (bss_entry = l_queue_get_entries(bss_list); bss_entry;
bss_entry = bss_entry->next) {
struct scan_bss *bss = bss_entry->data;
if (!util_ssid_is_hidden(bss->ssid_len, bss->ssid))
continue;
sc->sp.needs_active_scan = true;
}
}
static void scan_finished(struct scan_context *sc,
int err, struct l_queue *bss_list,
const struct scan_freq_set *freqs,
struct scan_request *sr)
{
bool new_owner = false;
scan_notify_func_t callback = sr ? sr->callback : sc->sp.callback;
void *userdata = sr ? sr->userdata : sc->sp.userdata;
if (bss_list)
discover_hidden_network_bsses(sc, bss_list);
if (sr)
sr->in_callback = true;
if (callback)
new_owner = callback(err, bss_list, freqs, userdata);
if (bss_list && !new_owner)
l_queue_destroy(bss_list,
(l_queue_destroy_func_t) scan_bss_free);
if (!sr)
return;
/*
* Can start a new scan now that we've removed this one from the
* queue. If this were an external scan request (sr NULL) then the
* SCAN_FINISHED or SCAN_ABORTED handler would have taken care of
* sending the next command for a new or ongoing scan.
*/
sr->in_callback = false;
l_queue_remove(sc->requests, sr);
wiphy_radio_work_done(sc->wiphy, sr->work.id);
}
static void get_scan_done(void *user)
{
struct scan_results *results = user;
struct scan_context *sc = results->sc;
sc->get_scan_cmd_id = 0;
if (!results->sr || !results->sr->canceled)
scan_finished(sc, 0, results->bss_list,
results->freqs, results->sr);
else
l_queue_destroy(results->bss_list,
(l_queue_destroy_func_t) scan_bss_free);
if (!results->sr)
scan_freq_set_free(results->freqs);
l_free(results);
}
static void scan_get_results(struct scan_context *sc, struct scan_request *sr,
struct scan_freq_set *freqs)
{
struct scan_results *results;
struct l_genl_msg *scan_msg;
results = l_new(struct scan_results, 1);
results->sc = sc;
results->time_stamp = l_time_now();
results->sr = sr;
results->bss_list = l_queue_new();
results->freqs = freqs;
scan_msg = l_genl_msg_new_sized(NL80211_CMD_GET_SCAN, 8);
l_genl_msg_append_attr(scan_msg, NL80211_ATTR_WDEV, 8,
&sc->wdev_id);
sc->get_scan_cmd_id = l_genl_family_dump(nl80211, scan_msg,
get_scan_callback,
results, get_scan_done);
}
static void scan_wiphy_watch(struct wiphy *wiphy,
enum wiphy_state_watch_event event,
void *user_data)
{
struct scan_context *sc = user_data;
struct scan_request *sr = NULL;
struct l_genl_msg *msg = NULL;
struct scan_parameters params = { 0 };
struct scan_freq_set *allowed;
_auto_(scan_freq_set_free) struct scan_freq_set *freqs_6ghz = NULL;
/* Only care about completed regulatory dumps */
if (event != WIPHY_STATE_WATCH_EVENT_REGDOM_DONE)
return;
if (!sc->sp.id)
return;
sr = l_queue_find(sc->requests, scan_request_match,
L_UINT_TO_PTR(sc->sp.id));
if (!sr)
return;
allowed = wiphy_get_allowed_freqs(sc->wiphy, BAND_FREQ_6_GHZ);
freqs_6ghz = scan_freq_set_clone(sr->scan_freqs, BAND_FREQ_6_GHZ);
/*
* This update did not allow 6GHz, or the original request was
* not expecting 6GHz. The periodic scan should now be ended.
*/
if (!allowed || scan_freq_set_isempty(freqs_6ghz) || !sr->split) {
scan_get_results(sc, sr, sr->freqs_scanned);
goto free_allowed;
}
/*
* At this point we know there is an ongoing periodic scan.
* Create a new 6GHz passive scan request and append to the
* command list
*/
msg = scan_build_cmd(sc, false, true, &params, freqs_6ghz);
l_queue_push_tail(sr->cmds, msg);
/*
* If this periodic scan is at the top of the queue, continue
* running it.
*/
if (l_queue_peek_head(sc->requests) == sr)
start_next_scan_request(&sr->work);
free_allowed:
scan_freq_set_free(allowed);
}
static struct scan_context *scan_context_new(uint64_t wdev_id)
{
struct wiphy *wiphy = wiphy_find_by_wdev(wdev_id);
struct scan_context *sc;
if (!wiphy)
return NULL;
sc = l_new(struct scan_context, 1);
sc->wdev_id = wdev_id;
sc->wiphy = wiphy;
sc->state = SCAN_STATE_NOT_RUNNING;
sc->requests = l_queue_new();
sc->wiphy_watch_id = wiphy_state_watch_add(wiphy, scan_wiphy_watch,
sc, NULL);
return sc;
}
static bool scan_parse_flush_flag_from_msg(struct l_genl_msg *msg)
{
struct l_genl_attr attr;
uint16_t type, len;
const void *data;
if (!l_genl_attr_init(&attr, msg))
return false;
while (l_genl_attr_next(&attr, &type, &len, &data))
if (type == NL80211_SCAN_FLAG_FLUSH)
return true;
return false;
}
static void scan_parse_result_frequencies(struct l_genl_msg *msg,
struct scan_freq_set *freqs)
{
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;
}
scan_parse_attr_scan_frequencies(&nested, freqs);
break;
}
}
}
static void scan_retry_pending(uint32_t wiphy_id)
{
const struct l_queue_entry *entry;
l_debug("");
for (entry = l_queue_get_entries(scan_contexts); entry;
entry = entry->next) {
struct scan_context *sc = entry->data;
struct scan_request *sr = l_queue_peek_head(sc->requests);
if (wiphy_get_id(sc->wiphy) != wiphy_id)
continue;
if (!sr)
continue;
if (!wiphy_radio_work_is_running(sc->wiphy, sr->work.id))
continue;
sc->state = SCAN_STATE_NOT_RUNNING;
start_next_scan_request(&sr->work);
return;
}
}
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;
uint64_t wdev_id;
uint32_t wiphy_id;
struct scan_context *sc;
bool active_scan = false;
uint64_t start_time_tsf = 0;
struct scan_request *sr;
cmd = l_genl_msg_get_command(msg);
if (nl80211_parse_attrs(msg, NL80211_ATTR_WDEV, &wdev_id,
NL80211_ATTR_WIPHY, &wiphy_id,
NL80211_ATTR_UNSPEC) < 0)
return;
sc = l_queue_find(scan_contexts, scan_context_match, &wdev_id);
if (!sc) {
/*
* If the event is for an unmanaged device, retry pending scan
* requests on the same wiphy.
*/
if (cmd == NL80211_CMD_NEW_SCAN_RESULTS ||
cmd == NL80211_CMD_SCAN_ABORTED)
scan_retry_pending(wiphy_id);
return;
}
l_debug("Scan notification %s(%u)", nl80211cmd_to_string(cmd), cmd);
if (!l_genl_attr_init(&attr, msg))
return;
while (l_genl_attr_next(&attr, &type, &len, &data)) {
switch (type) {
case NL80211_ATTR_SCAN_SSIDS:
active_scan = true;
break;
case NL80211_ATTR_SCAN_START_TIME_TSF:
if (len != sizeof(uint64_t))
return;
start_time_tsf = l_get_u64(data);
break;
}
}
sr = l_queue_peek_head(sc->requests);
switch (cmd) {
case NL80211_CMD_NEW_SCAN_RESULTS:
{
struct scan_freq_set *freqs;
bool send_next = false;
bool retry = false;
bool get_results = false;
sc->state = SCAN_STATE_NOT_RUNNING;
/* Was this our own scan or an external scan */
if (sr && sr->triggered) {
sr->triggered = false;
if (!sr->callback) {
scan_finished(sc, -ECANCELED, NULL, NULL, sr);
break;
}
/* Regdom changed during a periodic scan */
if (sc->sp.id == sr->work.id &&
wiphy_regdom_is_updating(sc->wiphy)) {
scan_parse_result_frequencies(msg,
sr->freqs_scanned);
return;
}
/*
* If this was the last command for the current request
* avoid starting the next request until the GET_SCAN
* dump callback so that any current request is always
* at the top of the queue and handling is simpler.
*/
if (l_queue_isempty(sr->cmds))
get_results = true;
else {
scan_parse_result_frequencies(msg,
sr->freqs_scanned);
send_next = true;
}
} else {
if (sc->get_scan_cmd_id)
break;
if (sc->sp.callback)
get_results = true;
/*
* Drop the ongoing scan if an external scan flushed
* our results. Otherwise, try to retry the trigger
* request if it failed with an -EBUSY.
*/
if (sr && sr->started &&
scan_parse_flush_flag_from_msg(msg))
scan_finished(sc, -EAGAIN, NULL, NULL, sr);
else
retry = true;
sr = NULL;
}
/*
* Send the next command of an ongoing request, or continue
* with a previously busy scan attempt due to an external
* scan.
*/
if (send_next || retry) {
struct scan_request *next = l_queue_peek_head(
sc->requests);
if (next && wiphy_radio_work_is_running(sc->wiphy,
next->work.id))
start_next_scan_request(&next->work);
}
if (!get_results)
break;
/*
* In case this was an external scan, setup a new, temporary
* frequency set to report the results to the periodic callback
*/
if (!sr)
freqs = scan_freq_set_new();
else
freqs = sr->freqs_scanned;
scan_parse_result_frequencies(msg, freqs);
scan_get_results(sc, sr, freqs);
break;
}
case NL80211_CMD_TRIGGER_SCAN:
if (active_scan)
sc->state = SCAN_STATE_ACTIVE;
else
sc->state = SCAN_STATE_PASSIVE;
if (sr)
sr->start_time_tsf = start_time_tsf;
break;
case NL80211_CMD_SCAN_ABORTED:
sc->state = SCAN_STATE_NOT_RUNNING;
/*
* If there's nothing pending, then most likely an external
* scan got aborted. We don't care, ignore.
*/
if (!sr)
break;
if (sr->triggered) {
sr->triggered = false;
scan_finished(sc, -ECANCELED, NULL, NULL, sr);
} else if (wiphy_radio_work_is_running(sc->wiphy,
sr->work.id)) {
/*
* If this was an external scan that got aborted
* we may be able to now queue our own scan although
* the abort could also have been triggered by the
* hardware or the driver because of another activity
* starting in which case we should just get an EBUSY.
*/
start_next_scan_request(&sr->work);
}
break;
}
}
static void get_fw_scan_done(void *userdata)
{
struct scan_results *results = userdata;
struct scan_request *sr = results->sr;
struct scan_context *sc = results->sc;
int err = l_queue_length(results->bss_list) == 0 ? -ENOENT : 0;
bool new_owner = false;
sc->get_fw_scan_cmd_id = 0;
if (sr->callback)
new_owner = sr->callback(err, results->bss_list, NULL,
sr->userdata);
if (!new_owner)
l_queue_destroy(results->bss_list,
(l_queue_destroy_func_t) scan_bss_free);
if (sr->destroy)
sr->destroy(sr->userdata);
l_free(sr);
l_free(results);
}
bool scan_get_firmware_scan(uint64_t wdev_id, scan_notify_func_t notify,
void *userdata, scan_destroy_func_t destroy)
{
struct l_genl_msg *scan_msg;
struct scan_results *results;
struct scan_request *sr;
struct scan_context *sc = l_queue_find(scan_contexts,
scan_context_match, &wdev_id);
if (!sc)
return false;
sr = l_new(struct scan_request, 1);
sr->callback = notify;
sr->destroy = destroy;
sr->userdata = userdata;
results = l_new(struct scan_results, 1);
results->sc = sc;
results->time_stamp = l_time_now();
results->bss_list = l_queue_new();
results->sr = sr;
scan_msg = l_genl_msg_new_sized(NL80211_CMD_GET_SCAN, 8);
l_genl_msg_append_attr(scan_msg, NL80211_ATTR_WDEV, 8, &sc->wdev_id);
sc->get_fw_scan_cmd_id = l_genl_family_dump(nl80211, scan_msg,
get_scan_callback,
results,
get_fw_scan_done);
if (!sc->get_fw_scan_cmd_id) {
l_queue_destroy(results->bss_list,
(l_queue_destroy_func_t) scan_bss_free);
l_free(results);
l_free(sr);
return false;
}
return true;
}
double scan_get_band_rank_modifier(enum band_freq band)
{
const struct l_settings *config = iwd_get_config();
double modifier;
char *str;
switch (band) {
case BAND_FREQ_2_4_GHZ:
str = "BandModifier2_4Ghz";
break;
case BAND_FREQ_5_GHZ:
str = "BandModifier5Ghz";
break;
case BAND_FREQ_6_GHZ:
str = "BandModifier6Ghz";
break;
default:
l_warn("Unhandled band %u", band);
return 0.0;
}
if (!l_settings_get_double(config, "Rank", str, &modifier))
modifier = 1.0;
return modifier;
}
bool scan_wdev_add(uint64_t wdev_id)
{
struct scan_context *sc;
if (l_queue_find(scan_contexts, scan_context_match, &wdev_id))
return false;
sc = scan_context_new(wdev_id);
if (!sc)
return false;
l_queue_push_head(scan_contexts, sc);
if (l_queue_length(scan_contexts) > 1)
goto done;
nl80211 = l_genl_family_new(iwd_get_genl(), NL80211_GENL_NAME);
l_genl_family_register(nl80211, "scan", scan_notify, NULL, NULL);
done:
return true;
}
bool scan_wdev_remove(uint64_t wdev_id)
{
struct scan_context *sc;
sc = l_queue_remove_if(scan_contexts, scan_context_match, &wdev_id);
if (!sc)
return false;
l_info("Removing scan context for wdev %" PRIx64, wdev_id);
scan_context_free(sc);
if (l_queue_isempty(scan_contexts)) {
l_genl_family_free(nl80211);
nl80211 = NULL;
}
return true;
}
static int scan_init(void)
{
const struct l_settings *config = iwd_get_config();
scan_contexts = l_queue_new();
RANK_2G_FACTOR = scan_get_band_rank_modifier(BAND_FREQ_2_4_GHZ);
RANK_5G_FACTOR = scan_get_band_rank_modifier(BAND_FREQ_5_GHZ);
RANK_6G_FACTOR = scan_get_band_rank_modifier(BAND_FREQ_6_GHZ);
if (!l_settings_get_uint(config, "Scan", "InitialPeriodicScanInterval",
&SCAN_INIT_INTERVAL))
SCAN_INIT_INTERVAL = 10;
if (SCAN_INIT_INTERVAL > UINT16_MAX)
SCAN_INIT_INTERVAL = UINT16_MAX;
if (!l_settings_get_uint(config, "Scan", "MaximumPeriodicScanInterval",
&SCAN_MAX_INTERVAL))
SCAN_MAX_INTERVAL = 300;
if (SCAN_MAX_INTERVAL > UINT16_MAX)
SCAN_MAX_INTERVAL = UINT16_MAX;
return 0;
}
static void scan_exit(void)
{
l_queue_destroy(scan_contexts,
(l_queue_destroy_func_t) scan_context_free);
scan_contexts = NULL;
l_genl_family_free(nl80211);
nl80211 = NULL;
}
IWD_MODULE(scan, scan_init, scan_exit)
IWD_MODULE_DEPENDS(scan, wiphy)
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