sta_info.c

最新的Host AP 新添加了许多pcmcia 的驱动

/*
 * hostapd / Station table
 * Copyright (c) 2002-2008, Jouni Malinen <[e-mail]>
 * Copyright (c) 2007-2008, Intel Corporation
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 *
 * Alternatively, this software may be distributed under the terms of BSD
 * license.
 *
 * See README and COPYING for more details.
 */

#include "includes.h"

#include "hostapd.h"
#include "sta_info.h"
#include "eloop.h"
#include "accounting.h"
#include "ieee802_1x.h"
#include "ieee802_11.h"
#include "radius/radius.h"
#include "wpa.h"
#include "preauth.h"
#include "radius/radius_client.h"
#include "driver.h"
#include "beacon.h"
#include "hw_features.h"
#include "mlme.h"
#include "vlan_init.h"

static int ap_sta_in_other_bss(struct hostapd_data *hapd,
			       struct sta_info *sta, u32 flags);
static void ap_handle_session_timer(void *eloop_ctx, void *timeout_ctx);
#ifdef CONFIG_IEEE80211W
static void ap_sa_query_timer(void *eloop_ctx, void *timeout_ctx);
#endif /* CONFIG_IEEE80211W */

int ap_for_each_sta(struct hostapd_data *hapd,
		    int (*cb)(struct hostapd_data *hapd, struct sta_info *sta,
			      void *ctx),
		    void *ctx)
{
	struct sta_info *sta;

	for (sta = hapd->sta_list; sta; sta = sta->next) {
		if (cb(hapd, sta, ctx))
			return 1;
	}

	return 0;
}


struct sta_info * ap_get_sta(struct hostapd_data *hapd, const u8 *sta)
{
	struct sta_info *s;

	s = hapd->sta_hash[STA_HASH(sta)];
	while (s != NULL && os_memcmp(s->addr, sta, 6) != 0)
		s = s->hnext;
	return s;
}


static void ap_sta_list_del(struct hostapd_data *hapd, struct sta_info *sta)
{
	struct sta_info *tmp;

	if (hapd->sta_list == sta) {
		hapd->sta_list = sta->next;
		return;
	}

	tmp = hapd->sta_list;
	while (tmp != NULL && tmp->next != sta)
		tmp = tmp->next;
	if (tmp == NULL) {
		wpa_printf(MSG_DEBUG, "Could not remove STA " MACSTR " from "
			   "list.", MAC2STR(sta->addr));
	} else
		tmp->next = sta->next;
}


void ap_sta_hash_add(struct hostapd_data *hapd, struct sta_info *sta)
{
	sta->hnext = hapd->sta_hash[STA_HASH(sta->addr)];
	hapd->sta_hash[STA_HASH(sta->addr)] = sta;
}


static void ap_sta_hash_del(struct hostapd_data *hapd, struct sta_info *sta)
{
	struct sta_info *s;

	s = hapd->sta_hash[STA_HASH(sta->addr)];
	if (s == NULL) return;
	if (os_memcmp(s->addr, sta->addr, 6) == 0) {
		hapd->sta_hash[STA_HASH(sta->addr)] = s->hnext;
		return;
	}

	while (s->hnext != NULL &&
	       os_memcmp(s->hnext->addr, sta->addr, ETH_ALEN) != 0)
		s = s->hnext;
	if (s->hnext != NULL)
		s->hnext = s->hnext->hnext;
	else
		wpa_printf(MSG_DEBUG, "AP: could not remove STA " MACSTR
			   " from hash table", MAC2STR(sta->addr));
}


void ap_free_sta(struct hostapd_data *hapd, struct sta_info *sta)
{
	int set_beacon = 0;

	accounting_sta_stop(hapd, sta);

	if (!ap_sta_in_other_bss(hapd, sta, WLAN_STA_ASSOC) &&
	    !(sta->flags & WLAN_STA_PREAUTH))
		hostapd_sta_remove(hapd, sta->addr);

	ap_sta_hash_del(hapd, sta);
	ap_sta_list_del(hapd, sta);

	if (sta->aid > 0)
		hapd->sta_aid[sta->aid - 1] = NULL;

	hapd->num_sta--;
	if (sta->nonerp_set) {
		sta->nonerp_set = 0;
		hapd->iface->num_sta_non_erp--;
		if (hapd->iface->num_sta_non_erp == 0)
			set_beacon++;
	}

	if (sta->no_short_slot_time_set) {
		sta->no_short_slot_time_set = 0;
		hapd->iface->num_sta_no_short_slot_time--;
		if (hapd->iface->current_mode->mode == HOSTAPD_MODE_IEEE80211G
		    && hapd->iface->num_sta_no_short_slot_time == 0)
			set_beacon++;
	}

	if (sta->no_short_preamble_set) {
		sta->no_short_preamble_set = 0;
		hapd->iface->num_sta_no_short_preamble--;
		if (hapd->iface->current_mode->mode == HOSTAPD_MODE_IEEE80211G
		    && hapd->iface->num_sta_no_short_preamble == 0)
			set_beacon++;
	}

#ifdef CONFIG_IEEE80211N
	if (sta->no_ht_gf_set) {
		sta->no_ht_gf_set = 0;
		hapd->iface->num_sta_ht_no_gf--;
	}

	if (sta->no_ht_set) {
		sta->no_ht_set = 0;
		hapd->iface->num_sta_no_ht--;
	}

	if (sta->ht_20mhz_set) {
		sta->ht_20mhz_set = 0;
		hapd->iface->num_sta_ht_20mhz--;
	}

	if (hostapd_ht_operation_update(hapd->iface) > 0)
		set_beacon++;
#endif /* CONFIG_IEEE80211N */

	if (set_beacon)
		ieee802_11_set_beacons(hapd->iface);

	eloop_cancel_timeout(ap_handle_timer, hapd, sta);
	eloop_cancel_timeout(ap_handle_session_timer, hapd, sta);

	ieee802_1x_free_station(sta);
	wpa_auth_sta_deinit(sta->wpa_sm);
	rsn_preauth_free_station(hapd, sta);
	radius_client_flush_auth(hapd->radius, sta->addr);

	os_free(sta->last_assoc_req);
	os_free(sta->challenge);

#ifdef CONFIG_IEEE80211W
	os_free(sta->sa_query_trans_id);
	eloop_cancel_timeout(ap_sa_query_timer, hapd, sta);
#endif /* CONFIG_IEEE80211W */

	wpabuf_free(sta->wps_ie);

	os_free(sta);
}


void hostapd_free_stas(struct hostapd_data *hapd)
{
	struct sta_info *sta, *prev;

	sta = hapd->sta_list;

	while (sta) {
		prev = sta;
		if (sta->flags & WLAN_STA_AUTH) {
			mlme_deauthenticate_indication(
				hapd, sta, WLAN_REASON_UNSPECIFIED);
		}
		sta = sta->next;
		wpa_printf(MSG_DEBUG, "Removing station " MACSTR,
			   MAC2STR(prev->addr));
		ap_free_sta(hapd, prev);
	}
}


/**
 * ap_handle_timer - Per STA timer handler
 * @eloop_ctx: struct hostapd_data *
 * @timeout_ctx: struct sta_info *
 *
 * This function is called to check station activity and to remove inactive
 * stations.
 */
void ap_handle_timer(void *eloop_ctx, void *timeout_ctx)
{
	struct hostapd_data *hapd = eloop_ctx;
	struct sta_info *sta = timeout_ctx;
	unsigned long next_time = 0;

	if (sta->timeout_next == STA_REMOVE) {
		hostapd_logger(hapd, sta->addr, HOSTAPD_MODULE_IEEE80211,
			       HOSTAPD_LEVEL_INFO, "deauthenticated due to "
			       "local deauth request");
		ap_free_sta(hapd, sta);
		return;
	}

	if ((sta->flags & WLAN_STA_ASSOC) &&
	    (sta->timeout_next == STA_NULLFUNC ||
	     sta->timeout_next == STA_DISASSOC)) {
		int inactive_sec;
		wpa_printf(MSG_DEBUG, "Checking STA " MACSTR " inactivity:",
			   MAC2STR(sta->addr));
		inactive_sec = hostapd_get_inact_sec(hapd, sta->addr);
		if (inactive_sec == -1) {
			wpa_printf(MSG_DEBUG, "Could not get station info "
				   "from kernel driver for " MACSTR ".",
				   MAC2STR(sta->addr));
		} else if (inactive_sec < hapd->conf->ap_max_inactivity &&
			   sta->flags & WLAN_STA_ASSOC) {
			/* station activity detected; reset timeout state */
			wpa_printf(MSG_DEBUG, "  Station has been active");
			sta->timeout_next = STA_NULLFUNC;
			next_time = hapd->conf->ap_max_inactivity -
				inactive_sec;
		}
	}

	if ((sta->flags & WLAN_STA_ASSOC) &&
	    sta->timeout_next == STA_DISASSOC &&
	    !(sta->flags & WLAN_STA_PENDING_POLL)) {
		wpa_printf(MSG_DEBUG, "  Station has ACKed data poll");
		/* data nullfunc frame poll did not produce TX errors; assume
		 * station ACKed it */
		sta->timeout_next = STA_NULLFUNC;
		next_time = hapd->conf->ap_max_inactivity;
	}

	if (next_time) {
		eloop_register_timeout(next_time, 0, ap_handle_timer, hapd,
				       sta);
		return;
	}

	if (sta->timeout_next == STA_NULLFUNC &&
	    (sta->flags & WLAN_STA_ASSOC)) {
		/* send data frame to poll STA and check whether this frame
		 * is ACKed */
		struct ieee80211_hdr hdr;

		wpa_printf(MSG_DEBUG, "  Polling STA with data frame");
		sta->flags |= WLAN_STA_PENDING_POLL;

#ifndef CONFIG_NATIVE_WINDOWS
		os_memset(&hdr, 0, sizeof(hdr));
		if (hapd->driver &&
		    os_strcmp(hapd->driver->name, "hostap") == 0) {
			/*
			 * WLAN_FC_STYPE_NULLFUNC would be more appropriate,
			 * but it is apparently not retried so TX Exc events
			 * are not received for it.
			 */
			hdr.frame_control =
				IEEE80211_FC(WLAN_FC_TYPE_DATA,
					     WLAN_FC_STYPE_DATA);
		} else {
			hdr.frame_control =
				IEEE80211_FC(WLAN_FC_TYPE_DATA,
					     WLAN_FC_STYPE_NULLFUNC);
		}

		hdr.frame_control |= host_to_le16(WLAN_FC_FROMDS);
		os_memcpy(hdr.IEEE80211_DA_FROMDS, sta->addr, ETH_ALEN);
		os_memcpy(hdr.IEEE80211_BSSID_FROMDS, hapd->own_addr,
			  ETH_ALEN);
		os_memcpy(hdr.IEEE80211_SA_FROMDS, hapd->own_addr, ETH_ALEN);

		if (hostapd_send_mgmt_frame(hapd, &hdr, sizeof(hdr), 0) < 0)
			perror("ap_handle_timer: send");
#endif /* CONFIG_NATIVE_WINDOWS */
	} else if (sta->timeout_next != STA_REMOVE) {
		int deauth = sta->timeout_next == STA_DEAUTH;

		wpa_printf(MSG_DEBUG, "Sending %s info to STA " MACSTR,
			   deauth ? "deauthentication" : "disassociation",
			   MAC2STR(sta->addr));

		if (deauth) {
			hostapd_sta_deauth(hapd, sta->addr,
					   WLAN_REASON_PREV_AUTH_NOT_VALID);
		} else {
			hostapd_sta_disassoc(
				hapd, sta->addr,
				WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY);
		}
	}

	switch (sta->timeout_next) {
	case STA_NULLFUNC:
		sta->timeout_next = STA_DISASSOC;
		eloop_register_timeout(AP_DISASSOC_DELAY, 0, ap_handle_timer,
				       hapd, sta);
		break;
	case STA_DISASSOC:
		sta->flags &= ~WLAN_STA_ASSOC;
		ieee802_1x_notify_port_enabled(sta->eapol_sm, 0);
		if (!sta->acct_terminate_cause)
			sta->acct_terminate_cause =
				RADIUS_ACCT_TERMINATE_CAUSE_IDLE_TIMEOUT;
		accounting_sta_stop(hapd, sta);
		ieee802_1x_free_station(sta);
		hostapd_logger(hapd, sta->addr, HOSTAPD_MODULE_IEEE80211,
			       HOSTAPD_LEVEL_INFO, "disassociated due to "
			       "inactivity");
		sta->timeout_next = STA_DEAUTH;
		eloop_register_timeout(AP_DEAUTH_DELAY, 0, ap_handle_timer,
				       hapd, sta);
		mlme_disassociate_indication(
			hapd, sta, WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY);
		break;