828 lines
19 KiB
C
828 lines
19 KiB
C
/*
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*
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* Wireless daemon for Linux
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*
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* Copyright (C) 2013-2015 Intel Corporation. All rights reserved.
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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*
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*/
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#ifdef HAVE_CONFIG_H
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#include <config.h>
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#endif
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#include <sys/types.h>
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#include <errno.h>
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#include <limits.h>
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#include <ell/ell.h>
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#include "src/ie.h"
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#include "src/crypto.h"
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#include "src/iwd.h"
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#include "src/common.h"
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#include "src/storage.h"
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#include "src/scan.h"
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#include "src/dbus.h"
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#include "src/agent.h"
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#include "src/device.h"
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#include "src/wiphy.h"
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#include "src/network.h"
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struct network {
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char *object_path;
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struct device *device;
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struct network_info *info;
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unsigned char *psk;
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unsigned int agent_request;
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struct l_queue *bss_list;
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struct l_settings *settings;
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bool update_psk:1; /* Whether PSK should be written to storage */
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bool ask_psk:1; /* Whether we should force-ask agent for PSK */
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int rank;
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};
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static struct l_queue *networks = NULL;
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static int timespec_compare(const void *a, const void *b, void *user_data)
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{
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const struct network_info *ni_a = a;
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const struct network_info *ni_b = b;
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const struct timespec *tsa = &ni_a->connected_time;
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const struct timespec *tsb = &ni_b->connected_time;
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if (tsa->tv_sec > tsb->tv_sec)
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return -1;
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if (tsa->tv_sec < tsb->tv_sec)
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return 1;
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if (tsa->tv_nsec > tsb->tv_nsec)
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return -1;
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if (tsa->tv_nsec < tsb->tv_nsec)
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return -1;
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return 0;
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}
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static bool network_info_match(const void *a, const void *b)
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{
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const struct network_info *ni_a = a;
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const struct network_info *ni_b = b;
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if (ni_a->type != ni_b->type)
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return false;
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if (strcmp(ni_a->ssid, ni_b->ssid))
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return false;
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return true;
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}
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bool network_seen(struct network *network, struct timespec *when)
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{
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/*
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* Update the last seen time. Note this is not preserved across
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* the network going out of range and back, or program restarts.
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* It may be desirable for it to be preserved in some way but
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* without too frequent filesystem writes.
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*/
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memcpy(&network->info->seen_time, when, sizeof(struct timespec));
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return true;
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}
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bool network_connected(struct network *network)
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{
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int err;
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const char *strtype;
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l_queue_remove(networks, network->info);
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l_queue_push_head(networks, network->info);
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strtype = security_to_str(network_get_security(network));
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if (!strtype)
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return false;
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err = storage_network_touch(strtype, network->info->ssid);
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if (err == -ENOENT) {
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/*
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* Write an empty settings file to keep track of the
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* last connected time. This will also make iwd autoconnect
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* to this network in the future.
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* Current policy is that network becomes a Known Network
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* only on a successful connect.
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*/
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if (!network_settings_load(network))
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return false;
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storage_network_sync(strtype, network->info->ssid,
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network->settings);
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} else
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return false;
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err = storage_network_get_mtime(strtype, network->info->ssid,
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&network->info->connected_time);
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if (err < 0)
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return false;
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network->info->is_known = true;
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return true;
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}
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void network_disconnected(struct network *network)
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{
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network_settings_close(network);
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}
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static int network_find_rank_index(const struct network_info *info)
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{
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const struct l_queue_entry *entry;
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int n;
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for (n = 0, entry = l_queue_get_entries(networks); entry;
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entry = entry->next) {
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struct network_info *network = entry->data;
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if (network == info)
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return n;
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if (network->is_known && network->seen_count)
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n++;
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}
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return -1;
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}
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/* First 64 entries calculated by 1 / pow(n, 0.3) for n >= 1 */
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static const double rankmod_table[] = {
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1.0000000000, 0.8122523964, 0.7192230933, 0.6597539554,
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0.6170338627, 0.5841906811, 0.5577898253, 0.5358867313,
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0.5172818580, 0.5011872336, 0.4870596972, 0.4745102806,
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0.4632516708, 0.4530661223, 0.4437850034, 0.4352752816,
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0.4274303178, 0.4201634287, 0.4134032816, 0.4070905315,
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0.4011753236, 0.3956154062, 0.3903746872, 0.3854221125,
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0.3807307877, 0.3762772797, 0.3720410580, 0.3680040435,
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0.3641502401, 0.3604654325, 0.3569369365, 0.3535533906,
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0.3503045821, 0.3471812999, 0.3441752105, 0.3412787518,
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0.3384850430, 0.3357878061, 0.3331812996, 0.3306602598,
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0.3282198502, 0.3258556179, 0.3235634544, 0.3213395618,
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0.3191804229, 0.3170827751, 0.3150435863, 0.3130600345,
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0.3111294892, 0.3092494947, 0.3074177553, 0.3056321221,
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0.3038905808, 0.3021912409, 0.3005323264, 0.2989121662,
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0.2973291870, 0.2957819051, 0.2942689208, 0.2927889114,
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0.2913406263, 0.2899228820, 0.2885345572, 0.2871745887,
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};
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bool network_rankmod(const struct network *network, double *rankmod)
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{
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int n = network_find_rank_index(network->info);
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int nmax;
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if (n == -1)
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return false;
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nmax = L_ARRAY_SIZE(rankmod_table);
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if (n >= nmax)
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n = nmax - 1;
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*rankmod = rankmod_table[n];
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return true;
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}
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static void network_info_free(void *data)
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{
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struct network_info *network = data;
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l_free(network);
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}
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static struct network_info *network_info_get(const char *ssid,
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enum security security)
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{
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struct network_info *network, search;
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search.type = security;
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strcpy(search.ssid, ssid);
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network = l_queue_find(networks, network_info_match, &search);
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if (!network) {
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network = l_new(struct network_info, 1);
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strcpy(network->ssid, ssid);
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network->type = security;
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l_queue_push_tail(networks, network);
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}
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network->seen_count++;
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return network;
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}
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static void network_info_put(struct network_info *network)
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{
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if (!networks)
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return;
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if (--network->seen_count)
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return;
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if (network->is_known)
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return;
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l_queue_remove(networks, network);
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network_info_free(network);
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}
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struct network *network_create(struct device *device,
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uint8_t *ssid, uint8_t ssid_len,
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enum security security)
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{
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struct network *network;
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network = l_new(struct network, 1);
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network->device = device;
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network->info = network_info_get((char *) ssid, security);
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network->bss_list = l_queue_new();
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return network;
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}
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const char *network_get_ssid(const struct network *network)
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{
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return network->info->ssid;
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}
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struct device *network_get_device(const struct network *network)
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{
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return network->device;
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}
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const char *network_get_path(const struct network *network)
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{
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return network->object_path;
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}
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enum security network_get_security(const struct network *network)
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{
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return network->info->type;
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}
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const unsigned char *network_get_psk(const struct network *network)
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{
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return network->psk;
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}
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int network_get_signal_strength(const struct network *network)
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{
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struct scan_bss *best_bss = l_queue_peek_head(network->bss_list);
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return best_bss->signal_strength;
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}
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struct l_settings *network_get_settings(const struct network *network)
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{
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return network->settings;
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}
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bool network_settings_load(struct network *network)
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{
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const char *strtype;
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if (network->settings)
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return true;
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strtype = security_to_str(network_get_security(network));
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if (!strtype)
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return false;
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network->settings = storage_network_open(strtype, network->info->ssid);
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return network->settings != NULL;
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}
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void network_sync_psk(struct network *network)
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{
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char *hex;
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if (!network->update_psk)
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return;
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network->update_psk = false;
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hex = l_util_hexstring(network->psk, 32);
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l_settings_set_value(network->settings, "Security",
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"PreSharedKey", hex);
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l_free(hex);
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storage_network_sync("psk", network->info->ssid, network->settings);
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}
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void network_settings_close(struct network *network)
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{
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if (!network->settings)
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return;
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l_settings_free(network->settings);
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network->settings = NULL;
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}
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int network_autoconnect(struct network *network, struct scan_bss *bss)
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{
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struct wiphy *wiphy = device_get_wiphy(network->device);
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switch (network_get_security(network)) {
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case SECURITY_NONE:
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break;
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case SECURITY_PSK:
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{
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uint16_t pairwise_ciphers, group_ciphers;
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const char *psk;
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size_t len;
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bss_get_supported_ciphers(bss,
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&pairwise_ciphers, &group_ciphers);
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if (!wiphy_select_cipher(wiphy, pairwise_ciphers) ||
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!wiphy_select_cipher(wiphy, group_ciphers)) {
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l_debug("Cipher mis-match");
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return -ENETUNREACH;
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}
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if (network->ask_psk)
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return -ENOKEY;
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network_settings_load(network);
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psk = l_settings_get_value(network->settings, "Security",
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"PreSharedKey");
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if (!psk)
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return -ENOKEY;
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l_free(network->psk);
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network->psk = l_util_from_hexstring(psk, &len);
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if (network->psk && len != 32) {
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l_free(network->psk);
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network->psk = NULL;
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return -ENOKEY;
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}
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break;
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}
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case SECURITY_8021X:
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network_settings_load(network);
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break;
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default:
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return -ENOTSUP;
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}
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device_connect_network(network->device, network, bss, NULL);
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return 0;
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}
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void network_connect_failed(struct network *network)
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{
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/*
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* Connection failed, if PSK try asking for the passphrase
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* once more
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*/
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if (network_get_security(network) == SECURITY_PSK) {
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network->update_psk = false;
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network->ask_psk = true;
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}
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}
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bool network_bss_add(struct network *network, struct scan_bss *bss)
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{
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return l_queue_insert(network->bss_list, bss,
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scan_bss_rank_compare, NULL);
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}
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bool network_bss_list_isempty(struct network *network)
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{
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return l_queue_isempty(network->bss_list);
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}
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void network_bss_list_clear(struct network *network)
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{
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l_queue_destroy(network->bss_list, NULL);
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network->bss_list = l_queue_new();
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}
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static struct scan_bss *network_select_bss(struct wiphy *wiphy,
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struct network *network)
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{
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struct l_queue *bss_list = network->bss_list;
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const struct l_queue_entry *bss_entry;
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switch (network_get_security(network)) {
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case SECURITY_NONE:
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/* Pick the first bss (strongest signal) */
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return l_queue_peek_head(bss_list);
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|
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case SECURITY_PSK:
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case SECURITY_8021X:
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/* Pick the first bss that advertises any cipher we support. */
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for (bss_entry = l_queue_get_entries(bss_list); bss_entry;
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bss_entry = bss_entry->next) {
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struct scan_bss *bss = bss_entry->data;
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uint16_t pairwise_ciphers, group_ciphers;
|
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bss_get_supported_ciphers(bss, &pairwise_ciphers,
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&group_ciphers);
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|
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if (wiphy_select_cipher(wiphy, pairwise_ciphers) &&
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wiphy_select_cipher(wiphy,
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group_ciphers))
|
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return bss;
|
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}
|
|
|
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return NULL;
|
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|
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default:
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return NULL;
|
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}
|
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}
|
|
|
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static void passphrase_callback(enum agent_result result,
|
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const char *passphrase,
|
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struct l_dbus_message *message,
|
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void *user_data)
|
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{
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struct network *network = user_data;
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struct wiphy *wiphy = device_get_wiphy(network->device);
|
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struct scan_bss *bss;
|
|
|
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l_debug("result %d", result);
|
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|
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network->agent_request = 0;
|
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|
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if (result != AGENT_RESULT_OK) {
|
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dbus_pending_reply(&message, dbus_error_aborted(message));
|
|
goto err;
|
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}
|
|
|
|
bss = network_select_bss(wiphy, network);
|
|
|
|
/* Did all good BSSes go away while we waited */
|
|
if (!bss) {
|
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dbus_pending_reply(&message, dbus_error_failed(message));
|
|
goto err;
|
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}
|
|
|
|
l_free(network->psk);
|
|
network->psk = l_malloc(32);
|
|
|
|
if (crypto_psk_from_passphrase(passphrase,
|
|
(uint8_t *) network->info->ssid,
|
|
strlen(network->info->ssid),
|
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network->psk) < 0) {
|
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l_error("PMK generation failed. "
|
|
"Ensure Crypto Engine is properly configured");
|
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dbus_pending_reply(&message, dbus_error_failed(message));
|
|
|
|
goto err;
|
|
}
|
|
|
|
/*
|
|
* We need to store the PSK in our permanent store. However, before
|
|
* we do that, make sure the PSK works. We write to the store only
|
|
* when we are connected
|
|
*/
|
|
network->update_psk = true;
|
|
|
|
device_connect_network(network->device, network, bss, message);
|
|
return;
|
|
|
|
err:
|
|
network_settings_close(network);
|
|
|
|
l_free(network->psk);
|
|
network->psk = NULL;
|
|
}
|
|
|
|
static struct l_dbus_message *network_connect_psk(struct network *network,
|
|
struct scan_bss *bss,
|
|
struct l_dbus_message *message)
|
|
{
|
|
struct device *device = network->device;
|
|
const char *psk;
|
|
|
|
l_debug("");
|
|
|
|
network_settings_load(network);
|
|
|
|
psk = l_settings_get_value(network->settings, "Security",
|
|
"PreSharedKey");
|
|
|
|
if (psk) {
|
|
size_t len;
|
|
|
|
l_debug("psk: %s", psk);
|
|
|
|
l_free(network->psk);
|
|
network->psk = l_util_from_hexstring(psk, &len);
|
|
|
|
l_debug("len: %zd", len);
|
|
|
|
if (network->psk && len != 32) {
|
|
l_debug("Can't parse PSK");
|
|
l_free(network->psk);
|
|
network->psk = NULL;
|
|
}
|
|
}
|
|
|
|
l_debug("ask_psk: %s", network->ask_psk ? "true" : "false");
|
|
|
|
if (network->ask_psk || !network->psk) {
|
|
network->ask_psk = false;
|
|
|
|
network->agent_request =
|
|
agent_request_passphrase(network->object_path,
|
|
passphrase_callback,
|
|
message,
|
|
network);
|
|
|
|
if (!network->agent_request)
|
|
return dbus_error_no_agent(message);
|
|
} else
|
|
device_connect_network(device, network, bss, message);
|
|
|
|
return NULL;
|
|
}
|
|
|
|
static struct l_dbus_message *network_connect(struct l_dbus *dbus,
|
|
struct l_dbus_message *message,
|
|
void *user_data)
|
|
{
|
|
struct network *network = user_data;
|
|
struct device *device = network->device;
|
|
struct scan_bss *bss;
|
|
|
|
l_debug("");
|
|
|
|
if (device_is_busy(device))
|
|
return dbus_error_busy(message);
|
|
|
|
/*
|
|
* Select the best BSS to use at this time. If we have to query the
|
|
* agent this may not be the final choice because BSS visibility can
|
|
* change while we wait for the agent.
|
|
*/
|
|
bss = network_select_bss(device_get_wiphy(device), network);
|
|
|
|
/* None of the BSSes is compatible with our stack */
|
|
if (!bss)
|
|
return dbus_error_not_supported(message);
|
|
|
|
switch (network_get_security(network)) {
|
|
case SECURITY_PSK:
|
|
return network_connect_psk(network, bss, message);
|
|
case SECURITY_NONE:
|
|
device_connect_network(device, network, bss, message);
|
|
return NULL;
|
|
case SECURITY_8021X:
|
|
network_settings_load(network);
|
|
device_connect_network(device, network, bss, message);
|
|
return NULL;
|
|
default:
|
|
return dbus_error_not_supported(message);
|
|
}
|
|
}
|
|
|
|
static bool network_property_get_name(struct l_dbus *dbus,
|
|
struct l_dbus_message *message,
|
|
struct l_dbus_message_builder *builder,
|
|
void *user_data)
|
|
{
|
|
struct network *network = user_data;
|
|
|
|
l_dbus_message_builder_append_basic(builder, 's', network->info->ssid);
|
|
return true;
|
|
}
|
|
|
|
static bool network_property_is_connected(struct l_dbus *dbus,
|
|
struct l_dbus_message *message,
|
|
struct l_dbus_message_builder *builder,
|
|
void *user_data)
|
|
{
|
|
struct network *network = user_data;
|
|
bool connected;
|
|
|
|
connected = device_get_connected_network(network->device) == network;
|
|
l_dbus_message_builder_append_basic(builder, 'b', &connected);
|
|
return true;
|
|
}
|
|
|
|
static void setup_network_interface(struct l_dbus_interface *interface)
|
|
{
|
|
l_dbus_interface_method(interface, "Connect", 0,
|
|
network_connect,
|
|
"", "");
|
|
|
|
l_dbus_interface_property(interface, "Name", 0, "s",
|
|
network_property_get_name, NULL);
|
|
|
|
l_dbus_interface_property(interface, "Connected", 0, "b",
|
|
network_property_is_connected,
|
|
NULL);
|
|
}
|
|
|
|
bool network_register(struct network *network, const char *path)
|
|
{
|
|
if (!l_dbus_object_add_interface(dbus_get_bus(), path,
|
|
IWD_NETWORK_INTERFACE, network)) {
|
|
l_info("Unable to register %s interface",
|
|
IWD_NETWORK_INTERFACE);
|
|
return false;
|
|
}
|
|
|
|
network->object_path = strdup(path);
|
|
|
|
return true;
|
|
}
|
|
|
|
static void network_unregister(struct network *network, int reason)
|
|
{
|
|
struct l_dbus *dbus = dbus_get_bus();
|
|
|
|
agent_request_cancel(network->agent_request, reason);
|
|
network_settings_close(network);
|
|
|
|
l_dbus_unregister_object(dbus, network->object_path);
|
|
|
|
l_free(network->object_path);
|
|
network->object_path = NULL;
|
|
}
|
|
|
|
void network_remove(struct network *network, int reason)
|
|
{
|
|
if (network->object_path)
|
|
network_unregister(network, reason);
|
|
|
|
l_queue_destroy(network->bss_list, NULL);
|
|
l_free(network->psk);
|
|
|
|
network_info_put(network->info);
|
|
|
|
l_free(network);
|
|
}
|
|
|
|
void network_init()
|
|
{
|
|
if (!l_dbus_register_interface(dbus_get_bus(), IWD_NETWORK_INTERFACE,
|
|
setup_network_interface, NULL, true))
|
|
l_error("Unable to register %s interface",
|
|
IWD_NETWORK_INTERFACE);
|
|
|
|
networks = l_queue_new();
|
|
}
|
|
|
|
void network_exit()
|
|
{
|
|
l_queue_destroy(networks, network_info_free);
|
|
networks = NULL;
|
|
|
|
l_dbus_unregister_interface(dbus_get_bus(), IWD_NETWORK_INTERFACE);
|
|
}
|
|
|
|
int network_rank_compare(const void *a, const void *b, void *user)
|
|
{
|
|
const struct network *new_network = a;
|
|
const struct network *network = b;
|
|
|
|
return network->rank - new_network->rank;
|
|
}
|
|
|
|
void network_rank_update(struct network *network)
|
|
{
|
|
bool connected;
|
|
int rank;
|
|
|
|
/*
|
|
* Theoretically there may be difference between the BSS selection
|
|
* here and in network_select_bss but those should be rare cases.
|
|
*/
|
|
struct scan_bss *best_bss = l_queue_peek_head(network->bss_list);
|
|
|
|
connected = device_get_connected_network(network->device) == network;
|
|
|
|
/*
|
|
* The rank should separate networks into four groups that use
|
|
* non-overlapping ranges for:
|
|
* - current connected network,
|
|
* - other networks we've connected to before,
|
|
* - networks with preprovisioned settings file that we haven't
|
|
* used yet,
|
|
* - other networks.
|
|
*
|
|
* Within the 2nd group the last connection time is the main factor,
|
|
* for the other two groups it's the BSS rank - mainly signal strength.
|
|
*/
|
|
if (connected)
|
|
rank = INT_MAX;
|
|
else if (network->info->connected_time.tv_sec != 0) {
|
|
int n = network_find_rank_index(network->info);
|
|
|
|
if (n >= (int) L_ARRAY_SIZE(rankmod_table))
|
|
n = L_ARRAY_SIZE(rankmod_table) - 1;
|
|
|
|
rank = rankmod_table[n] * best_bss->rank + USHRT_MAX;
|
|
} else if (network->info->is_known)
|
|
rank = best_bss->rank;
|
|
else
|
|
rank = (int) best_bss->rank - USHRT_MAX; /* Negative rank */
|
|
|
|
network->rank = rank;
|
|
}
|
|
|
|
bool network_info_add_known(const char *ssid, enum security security)
|
|
{
|
|
struct network_info *network;
|
|
int err;
|
|
|
|
network = l_new(struct network_info, 1);
|
|
strcpy(network->ssid, ssid);
|
|
network->type = security;
|
|
|
|
err = storage_network_get_mtime(security_to_str(security), ssid,
|
|
&network->connected_time);
|
|
if (err < 0) {
|
|
l_free(network);
|
|
return false;
|
|
}
|
|
|
|
network->is_known = true;
|
|
|
|
l_queue_insert(networks, network, timespec_compare, NULL);
|
|
|
|
return true;
|
|
}
|
|
|
|
static void network_info_check_device(struct device *device, void *user_data)
|
|
{
|
|
struct network_info *info = user_data;
|
|
struct network *network;
|
|
|
|
network = device_get_connected_network(device);
|
|
|
|
if (network && network->info == info)
|
|
device_disconnect(device);
|
|
}
|
|
|
|
bool network_info_forget_known(const char *ssid, enum security security)
|
|
{
|
|
struct network_info *network, search;
|
|
|
|
search.type = security;
|
|
strcpy(search.ssid, ssid);
|
|
|
|
network = l_queue_remove_if(networks, network_info_match, &search);
|
|
if (!network)
|
|
return false;
|
|
|
|
if (!network->seen_count) {
|
|
network_info_free(network);
|
|
|
|
return true;
|
|
}
|
|
|
|
memset(&network->connected_time, 0, sizeof(struct timespec));
|
|
|
|
network->is_known = false;
|
|
|
|
l_queue_push_tail(networks, network);
|
|
|
|
__iwd_device_foreach(network_info_check_device, network);
|
|
|
|
return true;
|
|
}
|
|
|
|
void network_info_foreach(network_info_foreach_func_t function,
|
|
void *user_data)
|
|
{
|
|
const struct l_queue_entry *entry;
|
|
|
|
for (entry = l_queue_get_entries(networks); entry; entry = entry->next)
|
|
function(entry->data, user_data);
|
|
}
|