/*
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* hostapd / Neighboring APs DB
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* Copyright(c) 2013 - 2016 Intel Mobile Communications GmbH.
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* Copyright(c) 2011 - 2016 Intel Corporation. All rights reserved.
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*
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* This software may be distributed under the terms of the BSD license.
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* See README 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 "hostapd.h"
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#include "ieee802_11.h"
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#include "neighbor_db.h"
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struct hostapd_neighbor_entry *
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hostapd_neighbor_get(struct hostapd_data *hapd, const u8 *bssid,
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const struct wpa_ssid_value *ssid)
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{
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struct hostapd_neighbor_entry *nr;
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dl_list_for_each(nr, &hapd->nr_db, struct hostapd_neighbor_entry,
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list) {
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if (os_memcmp(bssid, nr->bssid, ETH_ALEN) == 0 &&
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(!ssid ||
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(ssid->ssid_len == nr->ssid.ssid_len &&
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os_memcmp(ssid->ssid, nr->ssid.ssid,
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ssid->ssid_len) == 0)))
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return nr;
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}
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return NULL;
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}
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static void hostapd_neighbor_clear_entry(struct hostapd_neighbor_entry *nr)
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{
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wpabuf_free(nr->nr);
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nr->nr = NULL;
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wpabuf_free(nr->lci);
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nr->lci = NULL;
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wpabuf_free(nr->civic);
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nr->civic = NULL;
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os_memset(nr->bssid, 0, sizeof(nr->bssid));
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os_memset(&nr->ssid, 0, sizeof(nr->ssid));
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nr->stationary = 0;
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}
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static struct hostapd_neighbor_entry *
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hostapd_neighbor_add(struct hostapd_data *hapd)
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{
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struct hostapd_neighbor_entry *nr;
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nr = os_zalloc(sizeof(struct hostapd_neighbor_entry));
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if (!nr)
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return NULL;
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dl_list_add(&hapd->nr_db, &nr->list);
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return nr;
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}
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int hostapd_neighbor_set(struct hostapd_data *hapd, const u8 *bssid,
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const struct wpa_ssid_value *ssid,
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const struct wpabuf *nr, const struct wpabuf *lci,
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const struct wpabuf *civic, int stationary)
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{
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struct hostapd_neighbor_entry *entry;
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entry = hostapd_neighbor_get(hapd, bssid, ssid);
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if (!entry)
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entry = hostapd_neighbor_add(hapd);
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if (!entry)
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return -1;
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hostapd_neighbor_clear_entry(entry);
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os_memcpy(entry->bssid, bssid, ETH_ALEN);
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os_memcpy(&entry->ssid, ssid, sizeof(entry->ssid));
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entry->nr = wpabuf_dup(nr);
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if (!entry->nr)
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goto fail;
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if (lci && wpabuf_len(lci)) {
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entry->lci = wpabuf_dup(lci);
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if (!entry->lci || os_get_time(&entry->lci_date))
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goto fail;
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}
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if (civic && wpabuf_len(civic)) {
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entry->civic = wpabuf_dup(civic);
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if (!entry->civic)
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goto fail;
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}
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entry->stationary = stationary;
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return 0;
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fail:
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hostapd_neighbor_remove(hapd, bssid, ssid);
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return -1;
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}
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int hostapd_neighbor_remove(struct hostapd_data *hapd, const u8 *bssid,
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const struct wpa_ssid_value *ssid)
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{
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struct hostapd_neighbor_entry *nr;
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nr = hostapd_neighbor_get(hapd, bssid, ssid);
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if (!nr)
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return -1;
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hostapd_neighbor_clear_entry(nr);
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dl_list_del(&nr->list);
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os_free(nr);
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return 0;
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}
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void hostapd_free_neighbor_db(struct hostapd_data *hapd)
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{
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struct hostapd_neighbor_entry *nr, *prev;
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dl_list_for_each_safe(nr, prev, &hapd->nr_db,
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struct hostapd_neighbor_entry, list) {
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hostapd_neighbor_clear_entry(nr);
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dl_list_del(&nr->list);
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os_free(nr);
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}
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}
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#ifdef NEED_AP_MLME
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static enum nr_chan_width hostapd_get_nr_chan_width(struct hostapd_data *hapd,
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int ht, int vht)
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{
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if (!ht && !vht)
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return NR_CHAN_WIDTH_20;
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if (!hapd->iconf->secondary_channel)
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return NR_CHAN_WIDTH_20;
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if (!vht || hapd->iconf->vht_oper_chwidth == VHT_CHANWIDTH_USE_HT)
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return NR_CHAN_WIDTH_40;
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if (hapd->iconf->vht_oper_chwidth == VHT_CHANWIDTH_80MHZ)
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return NR_CHAN_WIDTH_80;
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if (hapd->iconf->vht_oper_chwidth == VHT_CHANWIDTH_160MHZ)
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return NR_CHAN_WIDTH_160;
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if (hapd->iconf->vht_oper_chwidth == VHT_CHANWIDTH_80P80MHZ)
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return NR_CHAN_WIDTH_80P80;
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return NR_CHAN_WIDTH_20;
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}
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#endif /* NEED_AP_MLME */
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void hostapd_neighbor_set_own_report(struct hostapd_data *hapd)
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{
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#ifdef NEED_AP_MLME
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u16 capab = hostapd_own_capab_info(hapd);
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int ht = hapd->iconf->ieee80211n && !hapd->conf->disable_11n;
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int vht = hapd->iconf->ieee80211ac && !hapd->conf->disable_11ac;
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struct wpa_ssid_value ssid;
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u8 channel, op_class;
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u8 center_freq1_idx = 0, center_freq2_idx = 0;
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enum nr_chan_width width;
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u32 bssid_info;
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struct wpabuf *nr;
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if (!(hapd->conf->radio_measurements[0] &
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WLAN_RRM_CAPS_NEIGHBOR_REPORT))
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return;
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bssid_info = 3; /* AP is reachable */
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bssid_info |= NEI_REP_BSSID_INFO_SECURITY; /* "same as the AP" */
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bssid_info |= NEI_REP_BSSID_INFO_KEY_SCOPE; /* "same as the AP" */
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if (capab & WLAN_CAPABILITY_SPECTRUM_MGMT)
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bssid_info |= NEI_REP_BSSID_INFO_SPECTRUM_MGMT;
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bssid_info |= NEI_REP_BSSID_INFO_RM; /* RRM is supported */
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if (hapd->conf->wmm_enabled) {
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bssid_info |= NEI_REP_BSSID_INFO_QOS;
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if (hapd->conf->wmm_uapsd &&
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(hapd->iface->drv_flags & WPA_DRIVER_FLAGS_AP_UAPSD))
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bssid_info |= NEI_REP_BSSID_INFO_APSD;
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}
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if (ht) {
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bssid_info |= NEI_REP_BSSID_INFO_HT |
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NEI_REP_BSSID_INFO_DELAYED_BA;
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/* VHT bit added in IEEE P802.11-REVmc/D4.3 */
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if (vht)
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bssid_info |= NEI_REP_BSSID_INFO_VHT;
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}
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/* TODO: Set NEI_REP_BSSID_INFO_MOBILITY_DOMAIN if MDE is set */
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if (ieee80211_freq_to_channel_ext(hapd->iface->freq,
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hapd->iconf->secondary_channel,
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hapd->iconf->vht_oper_chwidth,
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&op_class, &channel) ==
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NUM_HOSTAPD_MODES)
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return;
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width = hostapd_get_nr_chan_width(hapd, ht, vht);
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if (vht) {
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center_freq1_idx = hapd->iconf->vht_oper_centr_freq_seg0_idx;
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if (width == NR_CHAN_WIDTH_80P80)
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center_freq2_idx =
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hapd->iconf->vht_oper_centr_freq_seg1_idx;
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} else if (ht) {
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ieee80211_freq_to_chan(hapd->iface->freq +
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10 * hapd->iconf->secondary_channel,
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¢er_freq1_idx);
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}
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ssid.ssid_len = hapd->conf->ssid.ssid_len;
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os_memcpy(ssid.ssid, hapd->conf->ssid.ssid, ssid.ssid_len);
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/*
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* Neighbor Report element size = BSSID + BSSID info + op_class + chan +
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* phy type + wide bandwidth channel subelement.
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*/
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nr = wpabuf_alloc(ETH_ALEN + 4 + 1 + 1 + 1 + 5);
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if (!nr)
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return;
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wpabuf_put_data(nr, hapd->own_addr, ETH_ALEN);
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wpabuf_put_le32(nr, bssid_info);
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wpabuf_put_u8(nr, op_class);
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wpabuf_put_u8(nr, channel);
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wpabuf_put_u8(nr, ieee80211_get_phy_type(hapd->iface->freq, ht, vht));
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/*
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* Wide Bandwidth Channel subelement may be needed to allow the
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* receiving STA to send packets to the AP. See IEEE P802.11-REVmc/D5.0
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* Figure 9-301.
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*/
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wpabuf_put_u8(nr, WNM_NEIGHBOR_WIDE_BW_CHAN);
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wpabuf_put_u8(nr, 3);
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wpabuf_put_u8(nr, width);
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wpabuf_put_u8(nr, center_freq1_idx);
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wpabuf_put_u8(nr, center_freq2_idx);
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hostapd_neighbor_set(hapd, hapd->own_addr, &ssid, nr, hapd->iconf->lci,
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hapd->iconf->civic, hapd->iconf->stationary_ap);
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wpabuf_free(nr);
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#endif /* NEED_AP_MLME */
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}
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