2 * hostapd / Configuration reloading
3 * Copyright (c) 2002-2007, Jouni Malinen <j@w1.fi>
4 * Copyright (c) 2002-2004, Instant802 Networks, Inc.
5 * Copyright (c) 2005-2006, Devicescape Software, Inc.
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License version 2 as
9 * published by the Free Software Foundation.
11 * Alternatively, this software may be distributed under the terms of BSD
14 * See README and COPYING for more details.
21 #include "hw_features.h"
24 #include "radius/radius_client.h"
25 #include "ieee802_11.h"
29 #include "vlan_init.h"
30 #include "ieee802_11_auth.h"
31 #include "ieee802_1x.h"
32 #include "accounting.h"
37 * struct hostapd_config_change - Configuration change information
38 * This is for two purposes:
39 * - Storing configuration information in the hostapd_iface during
40 * the asynchronous parts of reconfiguration.
41 * - Passing configuration information for per-station reconfiguration.
43 struct hostapd_config_change {
44 struct hostapd_data *hapd;
45 struct hostapd_config *newconf, *oldconf;
46 struct hostapd_bss_config *newbss, *oldbss;
48 int num_sta_remove; /* number of STAs that need to be removed */
50 struct hostapd_iface *hapd_iface;
51 struct hostapd_data **new_hapd, **old_hapd;
56 static int hostapd_config_reload_sta(struct hostapd_data *hapd,
57 struct sta_info *sta, void *data)
59 struct hostapd_config_change *change = data;
60 struct hostapd_bss_config *newbss, *oldbss;
62 u8 reason = WLAN_REASON_PREV_AUTH_NOT_VALID;
64 newbss = change->newbss;
65 oldbss = change->oldbss;
68 if (sta->ssid == &oldbss->ssid) {
69 sta->ssid = &newbss->ssid;
71 if (newbss->ssid.ssid_len != oldbss->ssid.ssid_len ||
72 os_memcmp(newbss->ssid.ssid, oldbss->ssid.ssid,
73 newbss->ssid.ssid_len) != 0) {
74 /* main SSID was changed - kick STA out */
78 sta->ssid_probe = sta->ssid;
81 * If MAC ACL configuration has changed, deauthenticate stations that
82 * have been removed from accepted list or have been added to denied
83 * list. If external RADIUS server is used for ACL, all stations are
84 * deauthenticated and they will need to authenticate again. This
85 * limits sudden load on the RADIUS server since the verification will
86 * be done over the time needed for the STAs to reauthenticate
89 if (change->mac_acl_changed &&
90 (newbss->macaddr_acl == USE_EXTERNAL_RADIUS_AUTH ||
91 !hostapd_allowed_address(hapd, sta->addr, NULL, 0, NULL, NULL,
95 if (newbss->ieee802_1x != oldbss->ieee802_1x &&
96 sta->ssid == &hapd->conf->ssid)
99 if (newbss->wpa != oldbss->wpa)
102 if (!newbss->wme_enabled && (sta->flags & WLAN_STA_WME))
105 if (newbss->auth_algs != oldbss->auth_algs &&
106 ((sta->auth_alg == WLAN_AUTH_OPEN &&
107 !(newbss->auth_algs & WPA_AUTH_ALG_OPEN)) ||
108 (sta->auth_alg == WLAN_AUTH_SHARED_KEY &&
109 !(newbss->auth_algs & WPA_AUTH_ALG_SHARED))))
112 if (change->num_sta_remove > 0) {
114 reason = WLAN_REASON_DISASSOC_AP_BUSY;
118 wpa_printf(MSG_DEBUG, "STA " MACSTR " deauthenticated during "
119 "config reloading (reason=%d)",
120 MAC2STR(sta->addr), reason);
121 ieee802_11_send_deauth(hapd, sta->addr, reason);
122 ap_sta_deauthenticate(hapd, sta, reason);
123 change->num_sta_remove--;
130 static void hostapd_reconfig_tx_queue_params(struct hostapd_data *hapd,
131 struct hostapd_config *newconf,
132 struct hostapd_config *oldconf)
135 struct hostapd_tx_queue_params *o, *n;
137 for (i = 0; i < NUM_TX_QUEUES; i++) {
138 o = &oldconf->tx_queue[i];
139 n = &newconf->tx_queue[i];
144 if ((n->aifs != o->aifs || n->cwmin != o->cwmin ||
145 n->cwmax != o->cwmax || n->burst != o->burst) &&
146 hostapd_set_tx_queue_params(hapd, i, n->aifs, n->cwmin,
148 printf("Failed to set TX queue parameters for queue %d"
154 static int hostapd_reconfig_wme(struct hostapd_data *hapd,
155 struct hostapd_config *newconf,
156 struct hostapd_config *oldconf)
158 int beacon_changed = 0;
160 struct hostapd_wme_ac_params *o, *n;
162 for (i = 0; i < sizeof(newconf->wme_ac_params) /
163 sizeof(newconf->wme_ac_params[0]); i++) {
164 o = &oldconf->wme_ac_params[i];
165 n = &newconf->wme_ac_params[i];
166 if (n->cwmin != o->cwmin ||
167 n->cwmax != o->cwmax ||
168 n->aifs != o->aifs ||
169 n->txopLimit != o->txopLimit ||
170 n->admission_control_mandatory !=
171 o->admission_control_mandatory) {
173 hapd->parameter_set_count++;
177 return beacon_changed;
181 static int rate_array_diff(int *a1, int *a2)
185 if (a1 == NULL && a2 == NULL)
187 if (a1 == NULL || a2 == NULL)
203 static int hostapd_acl_diff(struct hostapd_bss_config *a,
204 struct hostapd_bss_config *b)
208 if (a->macaddr_acl != b->macaddr_acl ||
209 a->num_accept_mac != b->num_accept_mac ||
210 a->num_deny_mac != b->num_deny_mac)
213 for (i = 0; i < a->num_accept_mac; i++) {
214 if (os_memcmp(a->accept_mac[i].addr, b->accept_mac[i].addr,
219 for (i = 0; i < a->num_deny_mac; i++) {
220 if (os_memcmp(a->deny_mac[i].addr, b->deny_mac[i].addr,
230 * reload_iface2 - Part 2 of reload_iface
231 * @hapd_iface: Pointer to hostapd interface data.
233 static void reload_iface2(struct hostapd_iface *hapd_iface)
235 struct hostapd_data *hapd = hapd_iface->bss[0];
236 struct hostapd_config *newconf = hapd_iface->change->newconf;
237 struct hostapd_config *oldconf = hapd_iface->change->oldconf;
238 int beacon_changed = hapd_iface->change->beacon_changed;
239 hostapd_iface_cb cb = hapd_iface->reload_iface_cb;
241 if (newconf->preamble != oldconf->preamble) {
242 if (hostapd_set_preamble(hapd, hapd->iconf->preamble))
243 printf("Could not set preamble for kernel driver\n");
247 if (newconf->beacon_int != oldconf->beacon_int) {
248 /* Need to change beacon interval if it has changed or if
249 * auto channel selection was used. */
250 if (hostapd_set_beacon_int(hapd, newconf->beacon_int))
251 printf("Could not set beacon interval for kernel "
253 if (newconf->beacon_int != oldconf->beacon_int)
257 if (newconf->cts_protection_type != oldconf->cts_protection_type)
260 if (newconf->rts_threshold > -1 &&
261 newconf->rts_threshold != oldconf->rts_threshold &&
262 hostapd_set_rts(hapd, newconf->rts_threshold))
263 printf("Could not set RTS threshold for kernel driver\n");
265 if (newconf->fragm_threshold > -1 &&
266 newconf->fragm_threshold != oldconf->fragm_threshold &&
267 hostapd_set_frag(hapd, newconf->fragm_threshold))
268 printf("Could not set fragmentation threshold for kernel "
271 hostapd_reconfig_tx_queue_params(hapd, newconf, oldconf);
273 if (hostapd_reconfig_wme(hapd, newconf, oldconf) > 0)
276 ap_list_reconfig(hapd_iface, oldconf);
278 hapd_iface->change->beacon_changed = beacon_changed;
280 hapd_iface->reload_iface_cb = NULL;
286 * reload_iface2_handler - Handler that calls reload_face2
287 * @eloop_data: Stores the struct hostapd_iface for the interface.
290 static void reload_iface2_handler(void *eloop_data, void *user_ctx)
292 struct hostapd_iface *hapd_iface = eloop_data;
294 reload_iface2(hapd_iface);
299 * reload_hw_mode_done - Callback for after the HW mode is setup
300 * @hapd_iface: Pointer to interface data.
301 * @status: Status of the HW mode setup.
303 static void reload_hw_mode_done(struct hostapd_iface *hapd_iface, int status)
305 struct hostapd_data *hapd = hapd_iface->bss[0];
306 struct hostapd_config_change *change = hapd_iface->change;
307 struct hostapd_config *newconf = change->newconf;
312 printf("Failed to select hw_mode.\n");
314 cb = hapd_iface->reload_iface_cb;
315 hapd_iface->reload_iface_cb = NULL;
321 freq = hostapd_hw_get_freq(hapd, newconf->channel);
322 wpa_printf(MSG_DEBUG, "Mode: %s Channel: %d Frequency: %d MHz",
323 hostapd_hw_mode_txt(newconf->hw_mode),
324 newconf->channel, freq);
326 if (hostapd_set_freq(hapd, newconf->hw_mode, freq)) {
327 printf("Could not set channel %d (%d MHz) for kernel "
328 "driver\n", newconf->channel, freq);
331 change->beacon_changed++;
333 reload_iface2(hapd_iface);
338 * hostapd_config_reload_iface_start - Start interface reload
339 * @hapd_iface: Pointer to interface data.
340 * @cb: The function to callback when done.
341 * Returns: 0 if it starts successfully; cb will be called when done.
342 * -1 on failure; cb will not be called.
344 static int hostapd_config_reload_iface_start(struct hostapd_iface *hapd_iface,
347 struct hostapd_config_change *change = hapd_iface->change;
348 struct hostapd_config *newconf = change->newconf;
349 struct hostapd_config *oldconf = change->oldconf;
350 struct hostapd_data *hapd = hapd_iface->bss[0];
352 if (hapd_iface->reload_iface_cb) {
353 wpa_printf(MSG_DEBUG,
354 "%s: Interface reload already in progress.",
355 hapd_iface->bss[0]->conf->iface);
359 hapd_iface->reload_iface_cb = cb;
361 if (newconf->bridge_packets != oldconf->bridge_packets &&
362 hapd->iconf->bridge_packets != INTERNAL_BRIDGE_DO_NOT_CONTROL &&
363 hostapd_set_internal_bridge(hapd, hapd->iconf->bridge_packets))
364 printf("Failed to set bridge_packets for kernel driver\n");
366 if (newconf->channel != oldconf->channel ||
367 newconf->hw_mode != oldconf->hw_mode ||
368 rate_array_diff(newconf->supported_rates,
369 oldconf->supported_rates) ||
370 rate_array_diff(newconf->basic_rates, oldconf->basic_rates)) {
371 hostapd_free_stas(hapd);
373 if (hostapd_get_hw_features(hapd_iface)) {
374 printf("Could not read HW feature info from the kernel"
376 hapd_iface->reload_iface_cb = NULL;
380 if (hostapd_select_hw_mode_start(hapd_iface,
381 reload_hw_mode_done)) {
382 printf("Failed to start select hw_mode.\n");
383 hapd_iface->reload_iface_cb = NULL;
390 eloop_register_timeout(0, 0, reload_iface2_handler, hapd_iface, NULL);
395 static void hostapd_reconfig_bss(struct hostapd_data *hapd,
396 struct hostapd_bss_config *newbss,
397 struct hostapd_bss_config *oldbss,
398 struct hostapd_config *oldconf,
401 struct hostapd_config_change change;
402 int encr_changed = 0;
403 struct radius_client_data *old_radius;
405 radius_client_flush(hapd->radius, 0);
407 if (hostapd_set_dtim_period(hapd, newbss->dtim_period))
408 printf("Could not set DTIM period for kernel driver\n");
410 if (newbss->ssid.ssid_len != oldbss->ssid.ssid_len ||
411 os_memcmp(newbss->ssid.ssid, oldbss->ssid.ssid,
412 newbss->ssid.ssid_len) != 0) {
413 if (hostapd_set_ssid(hapd, (u8 *) newbss->ssid.ssid,
414 newbss->ssid.ssid_len))
415 printf("Could not set SSID for kernel driver\n");
419 if (newbss->ignore_broadcast_ssid != oldbss->ignore_broadcast_ssid)
422 if (hostapd_wep_key_cmp(&newbss->ssid.wep, &oldbss->ssid.wep)) {
427 vlan_reconfig(hapd, oldconf, oldbss);
429 if (beacon_changed) {
430 wpa_printf(MSG_DEBUG, "Updating beacon frame information");
431 ieee802_11_set_beacon(hapd);
435 change.oldconf = oldconf;
436 change.newconf = hapd->iconf;
437 change.oldbss = oldbss;
438 change.newbss = newbss;
439 change.mac_acl_changed = hostapd_acl_diff(newbss, oldbss);
440 if (newbss->max_num_sta != oldbss->max_num_sta &&
441 newbss->max_num_sta < hapd->num_sta) {
442 change.num_sta_remove = hapd->num_sta - newbss->max_num_sta;
444 change.num_sta_remove = 0;
445 ap_for_each_sta(hapd, hostapd_config_reload_sta, &change);
447 old_radius = hapd->radius;
448 hapd->radius = radius_client_reconfig(hapd->radius, hapd,
449 oldbss->radius, newbss->radius);
450 hapd->radius_client_reconfigured = old_radius != hapd->radius ||
451 hostapd_ip_diff(&newbss->own_ip_addr, &oldbss->own_ip_addr);
453 ieee802_1x_reconfig(hapd, oldconf, oldbss);
454 iapp_reconfig(hapd, oldconf, oldbss);
456 hostapd_acl_reconfig(hapd, oldconf);
457 accounting_reconfig(hapd, oldconf);
462 * config_reload2 - Part 2 of configuration reloading
465 static void config_reload2(struct hostapd_iface *hapd_iface, int status)
467 struct hostapd_config_change *change = hapd_iface->change;
468 struct hostapd_data *hapd = change->hapd;
469 struct hostapd_config *newconf = change->newconf;
470 struct hostapd_config *oldconf = change->oldconf;
471 int beacon_changed = change->beacon_changed;
472 struct hostapd_data **new_hapd = change->new_hapd;
473 struct hostapd_data **old_hapd = change->old_hapd;
474 int num_old_hapd = change->num_old_hapd;
475 size_t i, j, max_bss, same_bssid;
476 struct hostapd_bss_config *newbss, *oldbss;
481 hapd_iface->change = NULL;
484 printf("Failed to setup new interface config\n");
486 cb = hapd_iface->config_reload_cb;
487 hapd_iface->config_reload_cb = NULL;
489 /* Invalid configuration - cleanup and terminate hostapd */
490 hapd_iface->bss = old_hapd;
491 hapd_iface->num_bss = num_old_hapd;
492 hapd_iface->conf = hapd->iconf = oldconf;
493 hapd->conf = &oldconf->bss[0];
494 hostapd_config_free(newconf);
503 * If any BSSes have been removed, added, or had their BSSIDs changed,
504 * completely remove and reinitialize such BSSes and all the BSSes
505 * following them since their BSSID might have changed.
507 max_bss = oldconf->num_bss;
508 if (max_bss > newconf->num_bss)
509 max_bss = newconf->num_bss;
511 for (i = 0; i < max_bss; i++) {
512 if (os_strcmp(oldconf->bss[i].iface, newconf->bss[i].iface) !=
513 0 || hostapd_mac_comp(oldconf->bss[i].bssid,
514 newconf->bss[i].bssid) != 0)
519 for (i = 0; i < oldconf->num_bss; i++) {
520 oldbss = &oldconf->bss[i];
522 for (j = 0; j < newconf->num_bss; j++) {
523 if (os_strcmp(oldbss->iface, newconf->bss[j].iface) ==
525 newbss = &newconf->bss[j];
530 if (newbss && i < same_bssid) {
531 hapd = hapd_iface->bss[j] = old_hapd[i];
532 hapd->iconf = newconf;
534 hostapd_reconfig_bss(hapd, newbss, oldbss, oldconf,
538 wpa_printf(MSG_DEBUG, "Removing BSS (ifname %s)",
540 hostapd_free_stas(hapd);
541 /* Send broadcast deauthentication for this BSS, but do
542 * not clear all STAs from the driver since other BSSes
543 * may have STA entries. The driver will remove all STA
544 * entries for this BSS anyway when the interface is
547 hostapd_deauth_all_stas(hapd);
548 hostapd_cleanup(hapd);
556 prev_addr = hapd_iface->bss[0]->own_addr;
557 hapd = hapd_iface->bss[0];
558 for (j = 0; j < newconf->num_bss; j++) {
559 if (hapd_iface->bss[j] != NULL) {
560 prev_addr = hapd_iface->bss[j]->own_addr;
564 newbss = &newconf->bss[j];
566 wpa_printf(MSG_DEBUG, "Reconfiguration: adding new BSS "
567 "(ifname=%s)", newbss->iface);
570 hapd = hapd_iface->bss[j] =
571 hostapd_alloc_bss_data(hapd_iface, newconf, newbss);
573 printf("Failed to initialize new BSS\n");
574 /* FIX: This one is somewhat hard to recover
575 * from.. Would need to remove this BSS from
576 * conf and BSS list. */
580 hapd->driver = hapd_iface->bss[0]->driver;
581 hapd->iface = hapd_iface;
582 hapd->iconf = newconf;
585 os_memcpy(hapd->own_addr, prev_addr, ETH_ALEN);
586 if (hostapd_mac_comp_empty(hapd->conf->bssid) == 0)
587 prev_addr = hapd->own_addr;
590 if (hostapd_setup_bss(hapd, j == 0)) {
591 printf("Failed to setup new BSS\n");
600 hostapd_config_free(oldconf);
602 cb = hapd_iface->config_reload_cb;
603 hapd_iface->config_reload_cb = NULL;
610 * hostapd_config_reload_start - Start reconfiguration of an interface
611 * @hapd_iface: Pointer to hostapd interface data
612 * @cb: Function to be called back when done.
613 * The status indicates:
614 * 0 = success, new configuration in use;
615 * -1 = failed to update configuraiton, old configuration in use;
616 * -2 = failed to update configuration and failed to recover; caller
617 * should cleanup and terminate hostapd
619 * 0 = reconfiguration started;
620 * -1 = failed to update configuration, old configuration in use;
621 * -2 = failed to update configuration and failed to recover; caller
622 * should cleanup and terminate hostapd
624 int hostapd_config_reload_start(struct hostapd_iface *hapd_iface,
627 struct hostapd_config *newconf, *oldconf;
628 struct hostapd_config_change *change;
629 struct hostapd_data *hapd = NULL;
630 struct hostapd_data **old_hapd, **new_hapd;
633 if (hapd_iface->config_reload_cb) {
634 wpa_printf(MSG_DEBUG, "%s: Config reload already in progress.",
635 hapd_iface->bss[0]->conf->iface);
639 newconf = hostapd_config_read(hapd_iface->config_fname);
640 if (newconf == NULL) {
641 printf("Failed to read new configuration file - continuing "
646 if (os_strcmp(newconf->bss[0].iface, hapd_iface->conf->bss[0].iface) !=
648 printf("Interface name changing is not allowed in "
649 "configuration reloading (%s -> %s).\n",
650 hapd_iface->conf->bss[0].iface, newconf->bss[0].iface);
651 hostapd_config_free(newconf);
655 new_hapd = os_zalloc(newconf->num_bss *
656 sizeof(struct hostapd_data *));
657 if (new_hapd == NULL) {
658 hostapd_config_free(newconf);
661 old_hapd = hapd_iface->bss;
662 num_old_hapd = hapd_iface->num_bss;
664 hapd_iface->bss = new_hapd;
665 hapd_iface->num_bss = newconf->num_bss;
667 * First BSS remains the same since interface name changing was
668 * prohibited above. Now, this is only used in
669 * hostapd_config_reload_iface() and following loop will anyway set
672 hapd = hapd_iface->bss[0] = old_hapd[0];
674 oldconf = hapd_iface->conf;
675 hapd->iconf = hapd_iface->conf = newconf;
676 hapd->conf = &newconf->bss[0];
678 change = os_zalloc(sizeof(struct hostapd_config_change));
679 if (change == NULL) {
680 hostapd_config_free(newconf);
685 change->newconf = newconf;
686 change->oldconf = oldconf;
687 change->beacon_changed = 0;
688 change->hapd_iface = hapd_iface;
689 change->new_hapd = new_hapd;
690 change->old_hapd = old_hapd;
691 change->num_old_hapd = num_old_hapd;
693 hapd_iface->config_reload_cb = cb;
694 hapd_iface->change = change;
695 if (hostapd_config_reload_iface_start(hapd_iface, config_reload2)) {
696 printf("Failed to start setup of new interface config\n");
698 hapd_iface->config_reload_cb = NULL;
700 hapd_iface->change = NULL;
702 /* Invalid configuration - cleanup and terminate hostapd */
703 hapd_iface->bss = old_hapd;
704 hapd_iface->num_bss = num_old_hapd;
705 hapd_iface->conf = hapd->iconf = oldconf;
706 hapd->conf = &oldconf->bss[0];
707 hostapd_config_free(newconf);