/*
- * BSS client mode implementation
+ * Scanning implementation
+ *
* Copyright 2003, Jouni Malinen <jkmaline@cc.hut.fi>
* Copyright 2004, Instant802 Networks, Inc.
* Copyright 2005, Devicescape Software, Inc.
* published by the Free Software Foundation.
*/
+/* TODO:
+ * order BSS list by RSSI(?) ("quality of AP")
+ * scan result table filtering (by capability (privacy, IBSS/BSS, WPA/RSN IE,
+ * SSID)
+ */
+
#include <linux/wireless.h>
#include <linux/if_arp.h>
#include <net/mac80211.h>
#include <net/iw_handler.h>
#include "ieee80211_i.h"
+#include "mesh.h"
#define IEEE80211_PROBE_DELAY (HZ / 33)
#define IEEE80211_CHANNEL_TIME (HZ / 33)
#define IEEE80211_PASSIVE_CHANNEL_TIME (HZ / 5)
+void ieee80211_rx_bss_list_init(struct ieee80211_local *local)
+{
+ spin_lock_init(&local->sta_bss_lock);
+ INIT_LIST_HEAD(&local->sta_bss_list);
+}
+
+void ieee80211_rx_bss_list_deinit(struct ieee80211_local *local)
+{
+ struct ieee80211_sta_bss *bss, *tmp;
+
+ list_for_each_entry_safe(bss, tmp, &local->sta_bss_list, list)
+ ieee80211_rx_bss_put(local, bss);
+}
+
+struct ieee80211_sta_bss *
+ieee80211_rx_bss_get(struct ieee80211_local *local, u8 *bssid, int freq,
+ u8 *ssid, u8 ssid_len)
+{
+ struct ieee80211_sta_bss *bss;
+
+ spin_lock_bh(&local->sta_bss_lock);
+ bss = local->sta_bss_hash[STA_HASH(bssid)];
+ while (bss) {
+ if (!bss_mesh_cfg(bss) &&
+ !memcmp(bss->bssid, bssid, ETH_ALEN) &&
+ bss->freq == freq &&
+ bss->ssid_len == ssid_len &&
+ (ssid_len == 0 || !memcmp(bss->ssid, ssid, ssid_len))) {
+ atomic_inc(&bss->users);
+ break;
+ }
+ bss = bss->hnext;
+ }
+ spin_unlock_bh(&local->sta_bss_lock);
+ return bss;
+}
+
+/* Caller must hold local->sta_bss_lock */
+static void __ieee80211_rx_bss_hash_add(struct ieee80211_local *local,
+ struct ieee80211_sta_bss *bss)
+{
+ u8 hash_idx;
+
+ if (bss_mesh_cfg(bss))
+ hash_idx = mesh_id_hash(bss_mesh_id(bss),
+ bss_mesh_id_len(bss));
+ else
+ hash_idx = STA_HASH(bss->bssid);
+
+ bss->hnext = local->sta_bss_hash[hash_idx];
+ local->sta_bss_hash[hash_idx] = bss;
+}
+
+/* Caller must hold local->sta_bss_lock */
+static void __ieee80211_rx_bss_hash_del(struct ieee80211_local *local,
+ struct ieee80211_sta_bss *bss)
+{
+ struct ieee80211_sta_bss *b, *prev = NULL;
+ b = local->sta_bss_hash[STA_HASH(bss->bssid)];
+ while (b) {
+ if (b == bss) {
+ if (!prev)
+ local->sta_bss_hash[STA_HASH(bss->bssid)] =
+ bss->hnext;
+ else
+ prev->hnext = bss->hnext;
+ break;
+ }
+ prev = b;
+ b = b->hnext;
+ }
+}
+
+struct ieee80211_sta_bss *
+ieee80211_rx_bss_add(struct ieee80211_local *local, u8 *bssid, int freq,
+ u8 *ssid, u8 ssid_len)
+{
+ struct ieee80211_sta_bss *bss;
+
+ bss = kzalloc(sizeof(*bss), GFP_ATOMIC);
+ if (!bss)
+ return NULL;
+ atomic_set(&bss->users, 2);
+ memcpy(bss->bssid, bssid, ETH_ALEN);
+ bss->freq = freq;
+ if (ssid && ssid_len <= IEEE80211_MAX_SSID_LEN) {
+ memcpy(bss->ssid, ssid, ssid_len);
+ bss->ssid_len = ssid_len;
+ }
+
+ spin_lock_bh(&local->sta_bss_lock);
+ /* TODO: order by RSSI? */
+ list_add_tail(&bss->list, &local->sta_bss_list);
+ __ieee80211_rx_bss_hash_add(local, bss);
+ spin_unlock_bh(&local->sta_bss_lock);
+ return bss;
+}
+
+#ifdef CONFIG_MAC80211_MESH
+static struct ieee80211_sta_bss *
+ieee80211_rx_mesh_bss_get(struct ieee80211_local *local, u8 *mesh_id, int mesh_id_len,
+ u8 *mesh_cfg, int freq)
+{
+ struct ieee80211_sta_bss *bss;
+
+ spin_lock_bh(&local->sta_bss_lock);
+ bss = local->sta_bss_hash[mesh_id_hash(mesh_id, mesh_id_len)];
+ while (bss) {
+ if (bss_mesh_cfg(bss) &&
+ !memcmp(bss_mesh_cfg(bss), mesh_cfg, MESH_CFG_CMP_LEN) &&
+ bss->freq == freq &&
+ mesh_id_len == bss->mesh_id_len &&
+ (mesh_id_len == 0 || !memcmp(bss->mesh_id, mesh_id,
+ mesh_id_len))) {
+ atomic_inc(&bss->users);
+ break;
+ }
+ bss = bss->hnext;
+ }
+ spin_unlock_bh(&local->sta_bss_lock);
+ return bss;
+}
+
+static struct ieee80211_sta_bss *
+ieee80211_rx_mesh_bss_add(struct ieee80211_local *local, u8 *mesh_id, int mesh_id_len,
+ u8 *mesh_cfg, int mesh_config_len, int freq)
+{
+ struct ieee80211_sta_bss *bss;
+
+ if (mesh_config_len != MESH_CFG_LEN)
+ return NULL;
+
+ bss = kzalloc(sizeof(*bss), GFP_ATOMIC);
+ if (!bss)
+ return NULL;
+
+ bss->mesh_cfg = kmalloc(MESH_CFG_CMP_LEN, GFP_ATOMIC);
+ if (!bss->mesh_cfg) {
+ kfree(bss);
+ return NULL;
+ }
+
+ if (mesh_id_len && mesh_id_len <= IEEE80211_MAX_MESH_ID_LEN) {
+ bss->mesh_id = kmalloc(mesh_id_len, GFP_ATOMIC);
+ if (!bss->mesh_id) {
+ kfree(bss->mesh_cfg);
+ kfree(bss);
+ return NULL;
+ }
+ memcpy(bss->mesh_id, mesh_id, mesh_id_len);
+ }
+
+ atomic_set(&bss->users, 2);
+ memcpy(bss->mesh_cfg, mesh_cfg, MESH_CFG_CMP_LEN);
+ bss->mesh_id_len = mesh_id_len;
+ bss->freq = freq;
+ spin_lock_bh(&local->sta_bss_lock);
+ /* TODO: order by RSSI? */
+ list_add_tail(&bss->list, &local->sta_bss_list);
+ __ieee80211_rx_bss_hash_add(local, bss);
+ spin_unlock_bh(&local->sta_bss_lock);
+ return bss;
+}
+#endif
+
+static void ieee80211_rx_bss_free(struct ieee80211_sta_bss *bss)
+{
+ kfree(bss->ies);
+ kfree(bss_mesh_id(bss));
+ kfree(bss_mesh_cfg(bss));
+ kfree(bss);
+}
+
+void ieee80211_rx_bss_put(struct ieee80211_local *local,
+ struct ieee80211_sta_bss *bss)
+{
+ local_bh_disable();
+ if (!atomic_dec_and_lock(&bss->users, &local->sta_bss_lock)) {
+ local_bh_enable();
+ return;
+ }
+
+ __ieee80211_rx_bss_hash_del(local, bss);
+ list_del(&bss->list);
+ spin_unlock_bh(&local->sta_bss_lock);
+ ieee80211_rx_bss_free(bss);
+}
+
+struct ieee80211_sta_bss *
+ieee80211_bss_info_update(struct ieee80211_local *local,
+ struct ieee80211_rx_status *rx_status,
+ struct ieee80211_mgmt *mgmt,
+ size_t len,
+ struct ieee802_11_elems *elems,
+ int freq, bool beacon)
+{
+ struct ieee80211_sta_bss *bss;
+ int clen;
+
+#ifdef CONFIG_MAC80211_MESH
+ if (elems->mesh_config)
+ bss = ieee80211_rx_mesh_bss_get(local, elems->mesh_id,
+ elems->mesh_id_len, elems->mesh_config, freq);
+ else
+#endif
+ bss = ieee80211_rx_bss_get(local, mgmt->bssid, freq,
+ elems->ssid, elems->ssid_len);
+ if (!bss) {
+#ifdef CONFIG_MAC80211_MESH
+ if (elems->mesh_config)
+ bss = ieee80211_rx_mesh_bss_add(local, elems->mesh_id,
+ elems->mesh_id_len, elems->mesh_config,
+ elems->mesh_config_len, freq);
+ else
+#endif
+ bss = ieee80211_rx_bss_add(local, mgmt->bssid, freq,
+ elems->ssid, elems->ssid_len);
+ if (!bss)
+ return NULL;
+ } else {
+#if 0
+ /* TODO: order by RSSI? */
+ spin_lock_bh(&local->sta_bss_lock);
+ list_move_tail(&bss->list, &local->sta_bss_list);
+ spin_unlock_bh(&local->sta_bss_lock);
+#endif
+ }
+
+ /* save the ERP value so that it is available at association time */
+ if (elems->erp_info && elems->erp_info_len >= 1) {
+ bss->erp_value = elems->erp_info[0];
+ bss->has_erp_value = 1;
+ }
+
+ bss->beacon_int = le16_to_cpu(mgmt->u.beacon.beacon_int);
+ bss->capability = le16_to_cpu(mgmt->u.beacon.capab_info);
+
+ if (elems->tim) {
+ struct ieee80211_tim_ie *tim_ie =
+ (struct ieee80211_tim_ie *)elems->tim;
+ bss->dtim_period = tim_ie->dtim_period;
+ }
+
+ /* set default value for buggy APs */
+ if (!elems->tim || bss->dtim_period == 0)
+ bss->dtim_period = 1;
+
+ bss->supp_rates_len = 0;
+ if (elems->supp_rates) {
+ clen = IEEE80211_MAX_SUPP_RATES - bss->supp_rates_len;
+ if (clen > elems->supp_rates_len)
+ clen = elems->supp_rates_len;
+ memcpy(&bss->supp_rates[bss->supp_rates_len], elems->supp_rates,
+ clen);
+ bss->supp_rates_len += clen;
+ }
+ if (elems->ext_supp_rates) {
+ clen = IEEE80211_MAX_SUPP_RATES - bss->supp_rates_len;
+ if (clen > elems->ext_supp_rates_len)
+ clen = elems->ext_supp_rates_len;
+ memcpy(&bss->supp_rates[bss->supp_rates_len],
+ elems->ext_supp_rates, clen);
+ bss->supp_rates_len += clen;
+ }
+
+ bss->band = rx_status->band;
+
+ bss->timestamp = le64_to_cpu(mgmt->u.beacon.timestamp);
+ bss->last_update = jiffies;
+ bss->signal = rx_status->signal;
+ bss->noise = rx_status->noise;
+ bss->qual = rx_status->qual;
+ bss->wmm_used = elems->wmm_param || elems->wmm_info;
+
+ if (!beacon)
+ bss->last_probe_resp = jiffies;
+
+ /*
+ * For probe responses, or if we don't have any information yet,
+ * use the IEs from the beacon.
+ */
+ if (!bss->ies || !beacon) {
+ if (bss->ies == NULL || bss->ies_len < elems->total_len) {
+ kfree(bss->ies);
+ bss->ies = kmalloc(elems->total_len, GFP_ATOMIC);
+ }
+ if (bss->ies) {
+ memcpy(bss->ies, elems->ie_start, elems->total_len);
+ bss->ies_len = elems->total_len;
+ } else
+ bss->ies_len = 0;
+ }
+
+ return bss;
+}
ieee80211_rx_result
ieee80211_sta_rx_scan(struct ieee80211_sub_if_data *sdata, struct sk_buff *skb,
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