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 ¢er_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 } 258
