3 * Copyright (c) 2002-2009, Jouni Malinen <j@w1.fi>
4 * Copyright (c) 2003-2004, Instant802 Networks, Inc.
5 * Copyright (c) 2006, Devicescape Software, Inc.
7 * This software may be distributed under the terms of the BSD license.
8 * See README for more details.
11 #include "utils/includes.h"
13 #include "utils/common.h"
14 #include "utils/eloop.h"
15 #include "common/ieee802_11_defs.h"
16 #include "common/ieee802_11_common.h"
18 #include "ap_config.h"
19 #include "ieee802_11.h"
25 /* AP list is a double linked list with head->prev pointing to the end of the
26 * list and tail->next = NULL. Entries are moved to the head of the list
27 * whenever a beacon has been received from the AP in question. The tail entry
28 * in this link will thus be the least recently used entry. */
31 static int ap_list_beacon_olbc(struct hostapd_iface *iface, struct ap_info *ap)
35 if (iface->current_mode == NULL ||
36 iface->current_mode->mode != HOSTAPD_MODE_IEEE80211G ||
37 iface->conf->channel != ap->channel)
40 if (ap->erp != -1 && (ap->erp & ERP_INFO_NON_ERP_PRESENT))
43 for (i = 0; i < WLAN_SUPP_RATES_MAX; i++) {
44 int rate = (ap->supported_rates[i] & 0x7f) * 5;
45 if (rate == 60 || rate == 90 || rate > 110)
53 static struct ap_info * ap_get_ap(struct hostapd_iface *iface, const u8 *ap)
57 s = iface->ap_hash[STA_HASH(ap)];
58 while (s != NULL && os_memcmp(s->addr, ap, ETH_ALEN) != 0)
64 static void ap_ap_list_add(struct hostapd_iface *iface, struct ap_info *ap)
67 ap->prev = iface->ap_list->prev;
68 iface->ap_list->prev = ap;
71 ap->next = iface->ap_list;
76 static void ap_ap_list_del(struct hostapd_iface *iface, struct ap_info *ap)
78 if (iface->ap_list == ap)
79 iface->ap_list = ap->next;
81 ap->prev->next = ap->next;
84 ap->next->prev = ap->prev;
85 else if (iface->ap_list)
86 iface->ap_list->prev = ap->prev;
90 static void ap_ap_hash_add(struct hostapd_iface *iface, struct ap_info *ap)
92 ap->hnext = iface->ap_hash[STA_HASH(ap->addr)];
93 iface->ap_hash[STA_HASH(ap->addr)] = ap;
97 static void ap_ap_hash_del(struct hostapd_iface *iface, struct ap_info *ap)
101 s = iface->ap_hash[STA_HASH(ap->addr)];
102 if (s == NULL) return;
103 if (os_memcmp(s->addr, ap->addr, ETH_ALEN) == 0) {
104 iface->ap_hash[STA_HASH(ap->addr)] = s->hnext;
108 while (s->hnext != NULL &&
109 os_memcmp(s->hnext->addr, ap->addr, ETH_ALEN) != 0)
111 if (s->hnext != NULL)
112 s->hnext = s->hnext->hnext;
114 wpa_printf(MSG_INFO, "AP: could not remove AP " MACSTR
115 " from hash table", MAC2STR(ap->addr));
119 static void ap_free_ap(struct hostapd_iface *iface, struct ap_info *ap)
121 ap_ap_hash_del(iface, ap);
122 ap_ap_list_del(iface, ap);
129 static void hostapd_free_aps(struct hostapd_iface *iface)
131 struct ap_info *ap, *prev;
138 ap_free_ap(iface, prev);
141 iface->ap_list = NULL;
145 static struct ap_info * ap_ap_add(struct hostapd_iface *iface, const u8 *addr)
149 ap = os_zalloc(sizeof(struct ap_info));
153 /* initialize AP info data */
154 os_memcpy(ap->addr, addr, ETH_ALEN);
155 ap_ap_list_add(iface, ap);
157 ap_ap_hash_add(iface, ap);
159 if (iface->num_ap > iface->conf->ap_table_max_size && ap != ap->prev) {
160 wpa_printf(MSG_DEBUG, "Removing the least recently used AP "
161 MACSTR " from AP table", MAC2STR(ap->prev->addr));
162 ap_free_ap(iface, ap->prev);
169 void ap_list_process_beacon(struct hostapd_iface *iface,
170 const struct ieee80211_mgmt *mgmt,
171 struct ieee802_11_elems *elems,
172 struct hostapd_frame_info *fi)
178 if (iface->conf->ap_table_max_size < 1)
181 ap = ap_get_ap(iface, mgmt->bssid);
183 ap = ap_ap_add(iface, mgmt->bssid);
186 "Failed to allocate AP information entry");
192 merge_byte_arrays(ap->supported_rates, WLAN_SUPP_RATES_MAX,
193 elems->supp_rates, elems->supp_rates_len,
194 elems->ext_supp_rates, elems->ext_supp_rates_len);
197 ap->erp = elems->erp_info[0];
201 if (elems->ds_params)
202 ap->channel = elems->ds_params[0];
203 else if (elems->ht_operation)
204 ap->channel = elems->ht_operation[0];
206 ap->channel = fi->channel;
208 if (elems->ht_capabilities)
213 os_get_reltime(&ap->last_beacon);
215 if (!new_ap && ap != iface->ap_list) {
216 /* move AP entry into the beginning of the list so that the
217 * oldest entry is always in the end of the list */
218 ap_ap_list_del(iface, ap);
219 ap_ap_list_add(iface, ap);
223 ap_list_beacon_olbc(iface, ap)) {
225 wpa_printf(MSG_DEBUG, "OLBC AP detected: " MACSTR
226 " (channel %d) - enable protection",
227 MAC2STR(ap->addr), ap->channel);
231 #ifdef CONFIG_IEEE80211N
232 if (!iface->olbc_ht && !ap->ht_support &&
234 ap->channel == iface->conf->channel ||
235 ap->channel == iface->conf->channel +
236 iface->conf->secondary_channel * 4)) {
238 hostapd_ht_operation_update(iface);
239 wpa_printf(MSG_DEBUG, "OLBC HT AP detected: " MACSTR
240 " (channel %d) - enable protection",
241 MAC2STR(ap->addr), ap->channel);
244 #endif /* CONFIG_IEEE80211N */
247 ieee802_11_update_beacons(iface);
251 void ap_list_timer(struct hostapd_iface *iface)
253 struct os_reltime now;
260 os_get_reltime(&now);
262 while (iface->ap_list) {
263 ap = iface->ap_list->prev;
264 if (!os_reltime_expired(&now, &ap->last_beacon,
265 iface->conf->ap_table_expiration_time))
268 ap_free_ap(iface, ap);
271 if (iface->olbc || iface->olbc_ht) {
276 while (ap && (olbc == 0 || olbc_ht == 0)) {
277 if (ap_list_beacon_olbc(iface, ap))
283 if (!olbc && iface->olbc) {
284 wpa_printf(MSG_DEBUG, "OLBC not detected anymore");
288 #ifdef CONFIG_IEEE80211N
289 if (!olbc_ht && iface->olbc_ht) {
290 wpa_printf(MSG_DEBUG, "OLBC HT not detected anymore");
292 hostapd_ht_operation_update(iface);
295 #endif /* CONFIG_IEEE80211N */
299 ieee802_11_update_beacons(iface);
303 int ap_list_init(struct hostapd_iface *iface)
309 void ap_list_deinit(struct hostapd_iface *iface)
311 hostapd_free_aps(iface);