contrib/wpa/src/ap/neighbor_db.c

   1 /*
   2  * hostapd / Neighboring APs DB
   3  * Copyright(c) 2013 - 2016 Intel Mobile Communications GmbH.
   4  * Copyright(c) 2011 - 2016 Intel Corporation. All rights reserved.
   5  *
   6  * This software may be distributed under the terms of the BSD license.
   7  * See README for more details.
   8  */
   9
  10 #include "utils/includes.h"
  11
  12 #include "utils/common.h"
  13 #include "hostapd.h"
  14 #include "ieee802_11.h"
  15 #include "neighbor_db.h"
  16
  17
  18 struct hostapd_neighbor_entry *
  19 hostapd_neighbor_get(struct hostapd_data *hapd, const u8 *bssid,
  20                      const struct wpa_ssid_value *ssid)
  21 {
  22         struct hostapd_neighbor_entry *nr;
  23
  24         dl_list_for_each(nr, &hapd->nr_db, struct hostapd_neighbor_entry,
  25                          list) {
  26                 if (os_memcmp(bssid, nr->bssid, ETH_ALEN) == 0 &&
  27                     (!ssid ||
  28                      (ssid->ssid_len == nr->ssid.ssid_len &&
  29                       os_memcmp(ssid->ssid, nr->ssid.ssid,
  30                                 ssid->ssid_len) == 0)))
  31                         return nr;
  32         }
  33         return NULL;
  34 }
  35
  36
  37 static void hostapd_neighbor_clear_entry(struct hostapd_neighbor_entry *nr)
  38 {
  39         wpabuf_free(nr->nr);
  40         nr->nr = NULL;
  41         wpabuf_free(nr->lci);
  42         nr->lci = NULL;
  43         wpabuf_free(nr->civic);
  44         nr->civic = NULL;
  45         os_memset(nr->bssid, 0, sizeof(nr->bssid));
  46         os_memset(&nr->ssid, 0, sizeof(nr->ssid));
  47         nr->stationary = 0;
  48 }
  49
  50
  51 static struct hostapd_neighbor_entry *
  52 hostapd_neighbor_add(struct hostapd_data *hapd)
  53 {
  54         struct hostapd_neighbor_entry *nr;
  55
  56         nr = os_zalloc(sizeof(struct hostapd_neighbor_entry));
  57         if (!nr)
  58                 return NULL;
  59
  60         dl_list_add(&hapd->nr_db, &nr->list);
  61
  62         return nr;
  63 }
  64
  65
  66 int hostapd_neighbor_set(struct hostapd_data *hapd, const u8 *bssid,
  67                          const struct wpa_ssid_value *ssid,
  68                          const struct wpabuf *nr, const struct wpabuf *lci,
  69                          const struct wpabuf *civic, int stationary)
  70 {
  71         struct hostapd_neighbor_entry *entry;
  72
  73         entry = hostapd_neighbor_get(hapd, bssid, ssid);
  74         if (!entry)
  75                 entry = hostapd_neighbor_add(hapd);
  76         if (!entry)
  77                 return -1;
  78
  79         hostapd_neighbor_clear_entry(entry);
  80
  81         os_memcpy(entry->bssid, bssid, ETH_ALEN);
  82         os_memcpy(&entry->ssid, ssid, sizeof(entry->ssid));
  83
  84         entry->nr = wpabuf_dup(nr);
  85         if (!entry->nr)
  86                 goto fail;
  87
  88         if (lci && wpabuf_len(lci)) {
  89                 entry->lci = wpabuf_dup(lci);
  90                 if (!entry->lci || os_get_time(&entry->lci_date))
  91                         goto fail;
  92         }
  93
  94         if (civic && wpabuf_len(civic)) {
  95                 entry->civic = wpabuf_dup(civic);
  96                 if (!entry->civic)
  97                         goto fail;
  98         }
  99
 100         entry->stationary = stationary;
 101
 102         return 0;
 103
 104 fail:
 105         hostapd_neighbor_remove(hapd, bssid, ssid);
 106         return -1;
 107 }
 108
 109
 110 int hostapd_neighbor_remove(struct hostapd_data *hapd, const u8 *bssid,
 111                             const struct wpa_ssid_value *ssid)
 112 {
 113         struct hostapd_neighbor_entry *nr;
 114
 115         nr = hostapd_neighbor_get(hapd, bssid, ssid);
 116         if (!nr)
 117                 return -1;
 118
 119         hostapd_neighbor_clear_entry(nr);
 120         dl_list_del(&nr->list);
 121         os_free(nr);
 122
 123         return 0;
 124 }
 125
 126
 127 void hostapd_free_neighbor_db(struct hostapd_data *hapd)
 128 {
 129         struct hostapd_neighbor_entry *nr, *prev;
 130
 131         dl_list_for_each_safe(nr, prev, &hapd->nr_db,
 132                               struct hostapd_neighbor_entry, list) {
 133                 hostapd_neighbor_clear_entry(nr);
 134                 dl_list_del(&nr->list);
 135                 os_free(nr);
 136         }
 137 }
 138
 139
 140 #ifdef NEED_AP_MLME
 141 static enum nr_chan_width hostapd_get_nr_chan_width(struct hostapd_data *hapd,
 142                                                     int ht, int vht)
 143 {
 144         if (!ht && !vht)
 145                 return NR_CHAN_WIDTH_20;
 146         if (!hapd->iconf->secondary_channel)
 147                 return NR_CHAN_WIDTH_20;
 148         if (!vht || hapd->iconf->vht_oper_chwidth == VHT_CHANWIDTH_USE_HT)
 149                 return NR_CHAN_WIDTH_40;
 150         if (hapd->iconf->vht_oper_chwidth == VHT_CHANWIDTH_80MHZ)
 151                 return NR_CHAN_WIDTH_80;
 152         if (hapd->iconf->vht_oper_chwidth == VHT_CHANWIDTH_160MHZ)
 153                 return NR_CHAN_WIDTH_160;
 154         if (hapd->iconf->vht_oper_chwidth == VHT_CHANWIDTH_80P80MHZ)
 155                 return NR_CHAN_WIDTH_80P80;
 156         return NR_CHAN_WIDTH_20;
 157 }
 158 #endif /* NEED_AP_MLME */
 159
 160
 161 void hostapd_neighbor_set_own_report(struct hostapd_data *hapd)
 162 {
 163 #ifdef NEED_AP_MLME
 164         u16 capab = hostapd_own_capab_info(hapd);
 165         int ht = hapd->iconf->ieee80211n && !hapd->conf->disable_11n;
 166         int vht = hapd->iconf->ieee80211ac && !hapd->conf->disable_11ac;
 167         struct wpa_ssid_value ssid;
 168         u8 channel, op_class;
 169         u8 center_freq1_idx = 0, center_freq2_idx = 0;
 170         enum nr_chan_width width;
 171         u32 bssid_info;
 172         struct wpabuf *nr;
 173
 174         if (!(hapd->conf->radio_measurements[0] &
 175               WLAN_RRM_CAPS_NEIGHBOR_REPORT))
 176                 return;
 177
 178         bssid_info = 3; /* AP is reachable */
 179         bssid_info |= NEI_REP_BSSID_INFO_SECURITY; /* "same as the AP" */
 180         bssid_info |= NEI_REP_BSSID_INFO_KEY_SCOPE; /* "same as the AP" */
 181
 182         if (capab & WLAN_CAPABILITY_SPECTRUM_MGMT)
 183                 bssid_info |= NEI_REP_BSSID_INFO_SPECTRUM_MGMT;
 184
 185         bssid_info |= NEI_REP_BSSID_INFO_RM; /* RRM is supported */
 186
 187         if (hapd->conf->wmm_enabled) {
 188                 bssid_info |= NEI_REP_BSSID_INFO_QOS;
 189
 190                 if (hapd->conf->wmm_uapsd &&
 191                     (hapd->iface->drv_flags & WPA_DRIVER_FLAGS_AP_UAPSD))
 192                         bssid_info |= NEI_REP_BSSID_INFO_APSD;
 193         }
 194
 195         if (ht) {
 196                 bssid_info |= NEI_REP_BSSID_INFO_HT |
 197                         NEI_REP_BSSID_INFO_DELAYED_BA;
 198
 199                 /* VHT bit added in IEEE P802.11-REVmc/D4.3 */
 200                 if (vht)
 201                         bssid_info |= NEI_REP_BSSID_INFO_VHT;
 202         }
 203
 204         /* TODO: Set NEI_REP_BSSID_INFO_MOBILITY_DOMAIN if MDE is set */
 205
 206         if (ieee80211_freq_to_channel_ext(hapd->iface->freq,
 207                                           hapd->iconf->secondary_channel,
 208                                           hapd->iconf->vht_oper_chwidth,
 209                                           &op_class, &channel) ==
 210             NUM_HOSTAPD_MODES)
 211                 return;
 212         width = hostapd_get_nr_chan_width(hapd, ht, vht);
 213         if (vht) {
 214                 center_freq1_idx = hapd->iconf->vht_oper_centr_freq_seg0_idx;
 215                 if (width == NR_CHAN_WIDTH_80P80)
 216                         center_freq2_idx =
 217                                 hapd->iconf->vht_oper_centr_freq_seg1_idx;
 218         } else if (ht) {
 219                 ieee80211_freq_to_chan(hapd->iface->freq +
 220                                        10 * hapd->iconf->secondary_channel,
 221                                        &center_freq1_idx);
 222         }
 223
 224         ssid.ssid_len = hapd->conf->ssid.ssid_len;
 225         os_memcpy(ssid.ssid, hapd->conf->ssid.ssid, ssid.ssid_len);
 226
 227         /*
 228          * Neighbor Report element size = BSSID + BSSID info + op_class + chan +
 229          * phy type + wide bandwidth channel subelement.
 230          */
 231         nr = wpabuf_alloc(ETH_ALEN + 4 + 1 + 1 + 1 + 5);
 232         if (!nr)
 233                 return;
 234
 235         wpabuf_put_data(nr, hapd->own_addr, ETH_ALEN);
 236         wpabuf_put_le32(nr, bssid_info);
 237         wpabuf_put_u8(nr, op_class);
 238         wpabuf_put_u8(nr, channel);
 239         wpabuf_put_u8(nr, ieee80211_get_phy_type(hapd->iface->freq, ht, vht));
 240
 241         /*
 242          * Wide Bandwidth Channel subelement may be needed to allow the
 243          * receiving STA to send packets to the AP. See IEEE P802.11-REVmc/D5.0
 244          * Figure 9-301.
 245          */
 246         wpabuf_put_u8(nr, WNM_NEIGHBOR_WIDE_BW_CHAN);
 247         wpabuf_put_u8(nr, 3);
 248         wpabuf_put_u8(nr, width);
 249         wpabuf_put_u8(nr, center_freq1_idx);
 250         wpabuf_put_u8(nr, center_freq2_idx);
 251
 252         hostapd_neighbor_set(hapd, hapd->own_addr, &ssid, nr, hapd->iconf->lci,
 253                              hapd->iconf->civic, hapd->iconf->stationary_ap);
 254
 255         wpabuf_free(nr);
 256 #endif /* NEED_AP_MLME */
 257 }