Add BSS table to track scan results without dropping information
Collect information from scan results into a BSS table that will not expire information as quickly as scan results where every new scan, no matter for how limited set of channels/SSIDs, clears all old information. For now, this is only used for D-Bus BSS added/removed notifications, but this will likely be extended to be used internally instead of the scan results to better support partial scans.
This commit is contained in:
Jouni Malinen
parent
60ad2c7bef
commit
83922c2d34
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@ -1162,6 +1162,11 @@ OBJS += $(SHA1OBJS) $(DESOBJS)
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OBJS_p += $(SHA1OBJS)
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ifdef CONFIG_BSS_TABLE
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CFLAGS += -DCONFIG_BSS_TABLE
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OBJS += bss.o
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endif
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ifdef CONFIG_BGSCAN_SIMPLE
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CFLAGS += -DCONFIG_BGSCAN_SIMPLE
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OBJS += bgscan_simple.o
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@ -0,0 +1,262 @@
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/*
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* BSS table
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* Copyright (c) 2009, Jouni Malinen <j@w1.fi>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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* Alternatively, this software may be distributed under the terms of BSD
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* license.
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*
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* See README and COPYING for more details.
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*/
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#include "utils/includes.h"
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#include "utils/common.h"
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#include "utils/eloop.h"
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#include "common/ieee802_11_defs.h"
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#include "drivers/driver.h"
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#include "wpa_supplicant_i.h"
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#include "notify.h"
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#include "bss.h"
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#ifndef WPA_BSS_MAX_COUNT
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#define WPA_BSS_MAX_COUNT 200
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#endif /* WPA_BSS_MAX_COUNT */
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/**
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* WPA_BSS_EXPIRATION_PERIOD - Period of expiration run in seconds
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*/
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#define WPA_BSS_EXPIRATION_PERIOD 10
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/**
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* WPA_BSS_EXPIRATION_AGE - BSS entry age after which it can be expired
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*
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* This value control the time in seconds after which a BSS entry gets removed
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* if it has not been updated or is not in use.
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*/
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#define WPA_BSS_EXPIRATION_AGE 180
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/**
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* WPA_BSS_EXPIRATION_SCAN_COUNT - Expire BSS after number of scans
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*
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* If the BSS entry has not been seen in this many scans, it will be removed.
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* Value 1 means that the entry is removed after the first scan without the
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* BSSID being seen. Larger values can be used to avoid BSS entries
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* disappearing if they are not visible in every scan (e.g., low signal quality
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* or interference).
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*/
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#define WPA_BSS_EXPIRATION_SCAN_COUNT 2
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static void wpa_bss_remove(struct wpa_supplicant *wpa_s, struct wpa_bss *bss)
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{
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dl_list_del(&bss->list);
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wpa_s->num_bss--;
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wpa_printf(MSG_DEBUG, "BSS: Remove id %u BSSID " MACSTR " SSID '%s'",
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bss->id, MAC2STR(bss->bssid),
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wpa_ssid_txt(bss->ssid, bss->ssid_len));
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wpas_notify_bss_removed(wpa_s, bss->bssid);
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os_free(bss);
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}
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static struct wpa_bss * wpa_bss_get(struct wpa_supplicant *wpa_s,
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const u8 *bssid, const u8 *ssid,
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size_t ssid_len)
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{
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struct wpa_bss *bss;
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dl_list_for_each(bss, &wpa_s->bss, struct wpa_bss, list) {
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if (os_memcmp(bss->bssid, bssid, ETH_ALEN) == 0 &&
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bss->ssid_len == ssid_len &&
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os_memcmp(bss->ssid, ssid, ssid_len) == 0)
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return bss;
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}
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return NULL;
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}
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static void wpa_bss_copy_res(struct wpa_bss *dst, struct wpa_scan_res *src)
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{
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os_time_t usec;
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dst->flags = src->flags;
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os_memcpy(dst->bssid, src->bssid, ETH_ALEN);
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dst->freq = src->freq;
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dst->beacon_int = src->beacon_int;
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dst->caps = src->caps;
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dst->qual = src->qual;
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dst->noise = src->noise;
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dst->level = src->level;
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dst->tsf = src->tsf;
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os_get_time(&dst->last_update);
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dst->last_update.sec -= src->age / 1000;
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usec = (src->age % 1000) * 1000;
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if (dst->last_update.usec < usec) {
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dst->last_update.sec--;
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dst->last_update.usec += 1000000;
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}
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dst->last_update.usec -= usec;
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}
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static void wpa_bss_add(struct wpa_supplicant *wpa_s,
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const u8 *ssid, size_t ssid_len,
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struct wpa_scan_res *res)
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{
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struct wpa_bss *bss;
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bss = os_zalloc(sizeof(*bss) + res->ie_len);
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if (bss == NULL)
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return;
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bss->id = wpa_s->bss_next_id++;
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bss->last_update_idx = wpa_s->bss_update_idx;
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wpa_bss_copy_res(bss, res);
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os_memcpy(bss->ssid, ssid, ssid_len);
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bss->ssid_len = ssid_len;
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bss->ie_len = res->ie_len;
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os_memcpy(bss + 1, res + 1, res->ie_len);
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dl_list_add_tail(&wpa_s->bss, &bss->list);
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wpa_s->num_bss++;
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wpa_printf(MSG_DEBUG, "BSS: Add new id %u BSSID " MACSTR " SSID '%s'",
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bss->id, MAC2STR(bss->bssid), wpa_ssid_txt(ssid, ssid_len));
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wpas_notify_bss_added(wpa_s, res->bssid);
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if (wpa_s->num_bss > WPA_BSS_MAX_COUNT) {
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/* Remove the oldest entry */
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wpa_bss_remove(wpa_s, dl_list_first(&wpa_s->bss,
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struct wpa_bss, list));
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}
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}
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static void wpa_bss_update(struct wpa_supplicant *wpa_s, struct wpa_bss *bss,
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struct wpa_scan_res *res)
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{
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bss->scan_miss_count = 0;
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bss->last_update_idx = wpa_s->bss_update_idx;
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wpa_bss_copy_res(bss, res);
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/* Move the entry to the end of the list */
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dl_list_del(&bss->list);
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if (bss->ie_len >= res->ie_len) {
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os_memcpy(bss + 1, res + 1, res->ie_len);
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bss->ie_len = res->ie_len;
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} else {
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struct wpa_bss *nbss;
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nbss = os_realloc(bss, sizeof(*bss) + res->ie_len);
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if (nbss) {
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bss = nbss;
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os_memcpy(bss + 1, res + 1, res->ie_len);
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bss->ie_len = res->ie_len;
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}
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}
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dl_list_add_tail(&wpa_s->bss, &bss->list);
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}
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void wpa_bss_update_start(struct wpa_supplicant *wpa_s)
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{
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wpa_s->bss_update_idx++;
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wpa_printf(MSG_DEBUG, "BSS: Start scan result update %u",
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wpa_s->bss_update_idx);
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}
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void wpa_bss_update_scan_res(struct wpa_supplicant *wpa_s,
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struct wpa_scan_res *res)
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{
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const u8 *ssid;
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struct wpa_bss *bss;
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ssid = wpa_scan_get_ie(res, WLAN_EID_SSID);
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if (ssid == NULL) {
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wpa_printf(MSG_DEBUG, "BSS: No SSID IE included for " MACSTR,
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MAC2STR(res->bssid));
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return;
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}
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if (ssid[1] > 32) {
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wpa_printf(MSG_DEBUG, "BSS: Too long SSID IE included for "
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MACSTR, MAC2STR(res->bssid));
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return;
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}
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/* TODO: add option for ignoring BSSes we are not interested in
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* (to save memory) */
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bss = wpa_bss_get(wpa_s, res->bssid, ssid + 2, ssid[1]);
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if (bss == NULL)
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wpa_bss_add(wpa_s, ssid + 2, ssid[1], res);
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else
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wpa_bss_update(wpa_s, bss, res);
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}
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void wpa_bss_update_end(struct wpa_supplicant *wpa_s)
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{
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struct wpa_bss *bss, *n;
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/* TODO: expire only entries that were on the scanned frequencies/SSIDs
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* list; need to get info from driver about scanned frequencies and
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* SSIDs to be able to figure out which entries should be expired based
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* on this */
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dl_list_for_each_safe(bss, n, &wpa_s->bss, struct wpa_bss, list) {
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if (bss->last_update_idx < wpa_s->bss_update_idx)
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bss->scan_miss_count++;
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if (bss->scan_miss_count >= WPA_BSS_EXPIRATION_SCAN_COUNT) {
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wpa_printf(MSG_DEBUG, "BSS: Expire BSS %u due to no "
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"match in scan", bss->id);
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wpa_bss_remove(wpa_s, bss);
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}
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}
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}
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static void wpa_bss_timeout(void *eloop_ctx, void *timeout_ctx)
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{
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struct wpa_supplicant *wpa_s = eloop_ctx;
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struct wpa_bss *bss, *n;
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struct os_time t;
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if (dl_list_empty(&wpa_s->bss))
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return;
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os_get_time(&t);
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t.sec -= WPA_BSS_EXPIRATION_AGE;
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dl_list_for_each_safe(bss, n, &wpa_s->bss, struct wpa_bss, list) {
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if (os_memcmp(bss->bssid, wpa_s->bssid, ETH_ALEN) == 0 ||
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os_memcmp(bss->bssid, wpa_s->pending_bssid, ETH_ALEN) == 0)
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continue; /* do not expire BSSes that are in use */
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if (os_time_before(&bss->last_update, &t)) {
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wpa_printf(MSG_DEBUG, "BSS: Expire BSS %u due to age",
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bss->id);
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wpa_bss_remove(wpa_s, bss);
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} else
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break;
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}
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eloop_register_timeout(WPA_BSS_EXPIRATION_PERIOD, 0,
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wpa_bss_timeout, wpa_s, NULL);
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}
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int wpa_bss_init(struct wpa_supplicant *wpa_s)
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{
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dl_list_init(&wpa_s->bss);
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eloop_register_timeout(WPA_BSS_EXPIRATION_PERIOD, 0,
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wpa_bss_timeout, wpa_s, NULL);
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return 0;
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}
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void wpa_bss_deinit(struct wpa_supplicant *wpa_s)
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{
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struct wpa_bss *bss, *n;
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eloop_cancel_timeout(wpa_bss_timeout, wpa_s, NULL);
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dl_list_for_each_safe(bss, n, &wpa_s->bss, struct wpa_bss, list)
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wpa_bss_remove(wpa_s, bss);
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}
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@ -0,0 +1,74 @@
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/*
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* BSS table
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* Copyright (c) 2009, Jouni Malinen <j@w1.fi>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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* Alternatively, this software may be distributed under the terms of BSD
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* license.
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*
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* See README and COPYING for more details.
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*/
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#ifndef BSS_H
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#define BSS_H
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#define WPA_BSS_QUAL_INVALID BIT(0)
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#define WPA_BSS_NOISE_INVALID BIT(1)
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#define WPA_BSS_LEVEL_INVALID BIT(2)
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#define WPA_BSS_LEVEL_DBM BIT(3)
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#define WPA_BSS_AUTHENTICATED BIT(4)
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#define WPA_BSS_ASSOCIATED BIT(5)
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/**
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* struct wpa_bss - BSS table
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* @list: List entry for struct wpa_supplicant::bss
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* @id: Unique identifier for this BSS entry
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* @scan_miss_count: Number of counts without seeing this BSS
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* @flags: information flags about the BSS/IBSS (WPA_BSS_*)
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* @last_update_idx: Index of the last scan update
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* @bssid: BSSID
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* @freq: frequency of the channel in MHz (e.g., 2412 = channel 1)
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* @beacon_int: beacon interval in TUs (host byte order)
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* @caps: capability information field in host byte order
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* @qual: signal quality
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* @noise: noise level
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* @level: signal level
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* @tsf: Timestamp of last Beacon/Probe Response frame
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* @last_update: Time of the last update (i.e., Beacon or Probe Response RX)
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* @ie_len: length of the following IE field in octets
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*
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* This structure is used to store information about neighboring BSSes in
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* generic format. It is mainly updated based on scan results from the driver.
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*/
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struct wpa_bss {
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struct dl_list list;
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unsigned int id;
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unsigned int scan_miss_count;
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unsigned int last_update_idx;
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unsigned int flags;
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u8 bssid[ETH_ALEN];
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u8 ssid[32];
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size_t ssid_len;
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int freq;
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u16 beacon_int;
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u16 caps;
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int qual;
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int noise;
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int level;
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u64 tsf;
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struct os_time last_update;
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size_t ie_len;
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/* followed by ie_len octets of IEs */
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};
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void wpa_bss_update_start(struct wpa_supplicant *wpa_s);
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void wpa_bss_update_scan_res(struct wpa_supplicant *wpa_s,
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struct wpa_scan_res *res);
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void wpa_bss_update_end(struct wpa_supplicant *wpa_s);
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int wpa_bss_init(struct wpa_supplicant *wpa_s);
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void wpa_bss_deinit(struct wpa_supplicant *wpa_s);
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#endif /* BSS_H */
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@ -344,6 +344,8 @@ CONFIG_PEERKEY=y
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# Add support for new DBus control interface
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# (fi.w1.hostap.wpa_supplicant1)
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# Note: You will also need to enable CONFIG_BSS_TABLE if you want to have full
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# support for the documented D-Bus signals.
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#CONFIG_CTRL_IFACE_DBUS_NEW=y
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# Add introspection support for new DBus control interface (requires libxml2)
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@ -392,3 +394,6 @@ CONFIG_PEERKEY=y
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# This enables use of libbfd to get more detailed symbols for the backtraces
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# generated by CONFIG_WPA_TRACE=y.
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#CONFIG_WPA_TRACE_BFD=y
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# Maintain a local BSS table to track neighboring BSSes.
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CONFIG_BSS_TABLE=y
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@ -44,6 +44,7 @@
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#include "ap.h"
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#include "notify.h"
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#include "bgscan.h"
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#include "bss.h"
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const char *wpa_supplicant_version =
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"wpa_supplicant v" VERSION_STR "\n"
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@ -398,6 +399,9 @@ static void wpa_supplicant_cleanup(struct wpa_supplicant *wpa_s)
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wpa_scan_results_free(wpa_s->scan_res);
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wpa_s->scan_res = NULL;
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#ifdef CONFIG_BSS_TABLE
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wpa_bss_deinit(wpa_s);
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#endif /* CONFIG_BSS_TABLE */
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wpa_supplicant_cancel_scan(wpa_s);
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wpa_supplicant_cancel_auth_timeout(wpa_s);
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@ -1559,64 +1563,16 @@ int wpa_supplicant_set_debug_params(struct wpa_global *global, int debug_level,
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}
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static void notify_bss_changes(struct wpa_supplicant *wpa_s,
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u8 (*prev_bssids)[ETH_ALEN], int prev_num,
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struct wpa_scan_results *new)
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{
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int new_num, i, j;
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new_num = new != NULL ? new->num : 0;
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if (prev_bssids == NULL)
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prev_num = 0;
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for (i = 0; i < prev_num; i++) {
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for (j = 0; j < new_num; j++) {
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if (!os_memcmp(prev_bssids[i], new->res[j]->bssid,
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ETH_ALEN))
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break;
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}
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if (j == new_num)
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wpas_notify_bss_removed(wpa_s, prev_bssids[i]);
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}
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for (i = 0; i < new_num; i++) {
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for (j = 0; j < prev_num; j++) {
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if (!os_memcmp(new->res[i]->bssid, prev_bssids[j],
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ETH_ALEN))
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break;
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}
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if (j == prev_num)
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wpas_notify_bss_added(wpa_s, new->res[i]->bssid);
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}
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}
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/**
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* wpa_supplicant_get_scan_results - Get scan results
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* @wpa_s: Pointer to wpa_supplicant data
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* Returns: 0 on success, -1 on failure
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*
|
||||
* This function is request the current scan results from the driver and stores
|
||||
* a local copy of the results in wpa_s->scan_res.
|
||||
* This function request the current scan results from the driver and updates
|
||||
* the local BSS list wpa_s->bss.
|
||||
*/
|
||||
int wpa_supplicant_get_scan_results(struct wpa_supplicant *wpa_s)
|
||||
{
|
||||
int ret, i, prev_scan_res_num;
|
||||
u8 (*prev_scan_bssids)[ETH_ALEN];
|
||||
|
||||
prev_scan_res_num = wpa_s->scan_res ? wpa_s->scan_res->num : 0;
|
||||
prev_scan_bssids = os_malloc(prev_scan_res_num * ETH_ALEN);
|
||||
|
||||
if (prev_scan_bssids) {
|
||||
for (i = 0; i < prev_scan_res_num; i++) {
|
||||
os_memcpy(prev_scan_bssids[i],
|
||||
wpa_s->scan_res->res[i]->bssid, ETH_ALEN);
|
||||
}
|
||||
} else {
|
||||
wpa_printf(MSG_WARNING, "Not enough memory for old scan "
|
||||
"results list");
|
||||
prev_scan_res_num = 0;
|
||||
}
|
||||
|
||||
wpa_scan_results_free(wpa_s->scan_res);
|
||||
if (wpa_s->drv_flags & WPA_DRIVER_FLAGS_USER_SPACE_MLME)
|
||||
wpa_s->scan_res = ieee80211_sta_get_scan_results(wpa_s);
|
||||
|
|
@ -1624,17 +1580,23 @@ int wpa_supplicant_get_scan_results(struct wpa_supplicant *wpa_s)
|
|||
wpa_s->scan_res = wpa_drv_get_scan_results2(wpa_s);
|
||||
if (wpa_s->scan_res == NULL) {
|
||||
wpa_printf(MSG_DEBUG, "Failed to get scan results");
|
||||
ret = -1;
|
||||
} else {
|
||||
ret = 0;
|
||||
wpa_scan_sort_results(wpa_s->scan_res);
|
||||
return -1;
|
||||
}
|
||||
|
||||
notify_bss_changes(wpa_s, prev_scan_bssids, prev_scan_res_num,
|
||||
wpa_s->scan_res);
|
||||
os_free(prev_scan_bssids);
|
||||
wpa_scan_sort_results(wpa_s->scan_res);
|
||||
|
||||
return ret;
|
||||
#ifdef CONFIG_BSS_TABLE
|
||||
{
|
||||
size_t i;
|
||||
wpa_bss_update_start(wpa_s);
|
||||
for (i = 0; i < wpa_s->scan_res->num; i++)
|
||||
wpa_bss_update_scan_res(wpa_s,
|
||||
wpa_s->scan_res->res[i]);
|
||||
wpa_bss_update_end(wpa_s);
|
||||
}
|
||||
#endif /* CONFIG_BSS_TABLE */
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
|
||||
|
|
@ -2137,6 +2099,11 @@ next_driver:
|
|||
}
|
||||
#endif /* CONFIG_IBSS_RSN */
|
||||
|
||||
#ifdef CONFIG_BSS_TABLE
|
||||
if (wpa_bss_init(wpa_s) < 0)
|
||||
return -1;
|
||||
#endif /* CONFIG_BSS_TABLE */
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
|
|
|
|||
|
|
@ -1,6 +1,6 @@
|
|||
/*
|
||||
* wpa_supplicant - Internal definitions
|
||||
* Copyright (c) 2003-2007, Jouni Malinen <j@w1.fi>
|
||||
* Copyright (c) 2003-2009, Jouni Malinen <j@w1.fi>
|
||||
*
|
||||
* 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
|
||||
|
|
@ -15,6 +15,7 @@
|
|||
#ifndef WPA_SUPPLICANT_I_H
|
||||
#define WPA_SUPPLICANT_I_H
|
||||
|
||||
#include "utils/list.h"
|
||||
#include "common/defs.h"
|
||||
|
||||
extern const char *wpa_supplicant_version;
|
||||
|
|
@ -344,6 +345,10 @@ struct wpa_supplicant {
|
|||
#define WILDCARD_SSID_SCAN ((struct wpa_ssid *) 1)
|
||||
|
||||
struct wpa_scan_results *scan_res;
|
||||
struct dl_list bss; /* struct wpa_bss::list */
|
||||
size_t num_bss;
|
||||
unsigned int bss_update_idx;
|
||||
unsigned int bss_next_id;
|
||||
|
||||
struct wpa_driver_ops *driver;
|
||||
int interface_removed; /* whether the network interface has been
|
||||
|
|
|
|||
Loading…
Reference in New Issue