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![Johannes Berg](/assets/img/avatar_default.png)
There's really no reason for mac80211 to be using its own interface type defines. Use the nl80211 types and simplify the configuration code a bit: there's no need to translate them any more now. Signed-off-by: Johannes Berg <johannes@sipsolutions.net> Signed-off-by: John W. Linville <linville@tuxdriver.com>
937 lines
24 KiB
C
937 lines
24 KiB
C
/*
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* Scanning implementation
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*
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* Copyright 2003, Jouni Malinen <jkmaline@cc.hut.fi>
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* Copyright 2004, Instant802 Networks, Inc.
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* Copyright 2005, Devicescape Software, Inc.
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* Copyright 2006-2007 Jiri Benc <jbenc@suse.cz>
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* Copyright 2007, Michael Wu <flamingice@sourmilk.net>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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/* TODO:
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* order BSS list by RSSI(?) ("quality of AP")
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* scan result table filtering (by capability (privacy, IBSS/BSS, WPA/RSN IE,
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* SSID)
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*/
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#include <linux/wireless.h>
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#include <linux/if_arp.h>
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#include <net/mac80211.h>
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#include <net/iw_handler.h>
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#include "ieee80211_i.h"
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#include "mesh.h"
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#define IEEE80211_PROBE_DELAY (HZ / 33)
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#define IEEE80211_CHANNEL_TIME (HZ / 33)
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#define IEEE80211_PASSIVE_CHANNEL_TIME (HZ / 5)
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void ieee80211_rx_bss_list_init(struct ieee80211_local *local)
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{
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spin_lock_init(&local->bss_lock);
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INIT_LIST_HEAD(&local->bss_list);
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}
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void ieee80211_rx_bss_list_deinit(struct ieee80211_local *local)
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{
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struct ieee80211_bss *bss, *tmp;
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list_for_each_entry_safe(bss, tmp, &local->bss_list, list)
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ieee80211_rx_bss_put(local, bss);
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}
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struct ieee80211_bss *
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ieee80211_rx_bss_get(struct ieee80211_local *local, u8 *bssid, int freq,
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u8 *ssid, u8 ssid_len)
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{
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struct ieee80211_bss *bss;
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spin_lock_bh(&local->bss_lock);
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bss = local->bss_hash[STA_HASH(bssid)];
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while (bss) {
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if (!bss_mesh_cfg(bss) &&
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!memcmp(bss->bssid, bssid, ETH_ALEN) &&
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bss->freq == freq &&
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bss->ssid_len == ssid_len &&
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(ssid_len == 0 || !memcmp(bss->ssid, ssid, ssid_len))) {
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atomic_inc(&bss->users);
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break;
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}
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bss = bss->hnext;
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}
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spin_unlock_bh(&local->bss_lock);
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return bss;
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}
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/* Caller must hold local->bss_lock */
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static void __ieee80211_rx_bss_hash_add(struct ieee80211_local *local,
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struct ieee80211_bss *bss)
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{
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u8 hash_idx;
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if (bss_mesh_cfg(bss))
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hash_idx = mesh_id_hash(bss_mesh_id(bss),
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bss_mesh_id_len(bss));
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else
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hash_idx = STA_HASH(bss->bssid);
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bss->hnext = local->bss_hash[hash_idx];
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local->bss_hash[hash_idx] = bss;
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}
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/* Caller must hold local->bss_lock */
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static void __ieee80211_rx_bss_hash_del(struct ieee80211_local *local,
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struct ieee80211_bss *bss)
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{
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struct ieee80211_bss *b, *prev = NULL;
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b = local->bss_hash[STA_HASH(bss->bssid)];
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while (b) {
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if (b == bss) {
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if (!prev)
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local->bss_hash[STA_HASH(bss->bssid)] =
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bss->hnext;
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else
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prev->hnext = bss->hnext;
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break;
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}
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prev = b;
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b = b->hnext;
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}
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}
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struct ieee80211_bss *
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ieee80211_rx_bss_add(struct ieee80211_local *local, u8 *bssid, int freq,
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u8 *ssid, u8 ssid_len)
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{
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struct ieee80211_bss *bss;
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bss = kzalloc(sizeof(*bss), GFP_ATOMIC);
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if (!bss)
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return NULL;
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atomic_set(&bss->users, 2);
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memcpy(bss->bssid, bssid, ETH_ALEN);
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bss->freq = freq;
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if (ssid && ssid_len <= IEEE80211_MAX_SSID_LEN) {
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memcpy(bss->ssid, ssid, ssid_len);
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bss->ssid_len = ssid_len;
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}
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spin_lock_bh(&local->bss_lock);
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/* TODO: order by RSSI? */
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list_add_tail(&bss->list, &local->bss_list);
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__ieee80211_rx_bss_hash_add(local, bss);
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spin_unlock_bh(&local->bss_lock);
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return bss;
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}
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#ifdef CONFIG_MAC80211_MESH
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static struct ieee80211_bss *
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ieee80211_rx_mesh_bss_get(struct ieee80211_local *local, u8 *mesh_id, int mesh_id_len,
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u8 *mesh_cfg, int freq)
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{
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struct ieee80211_bss *bss;
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spin_lock_bh(&local->bss_lock);
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bss = local->bss_hash[mesh_id_hash(mesh_id, mesh_id_len)];
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while (bss) {
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if (bss_mesh_cfg(bss) &&
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!memcmp(bss_mesh_cfg(bss), mesh_cfg, MESH_CFG_CMP_LEN) &&
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bss->freq == freq &&
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mesh_id_len == bss->mesh_id_len &&
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(mesh_id_len == 0 || !memcmp(bss->mesh_id, mesh_id,
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mesh_id_len))) {
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atomic_inc(&bss->users);
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break;
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}
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bss = bss->hnext;
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}
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spin_unlock_bh(&local->bss_lock);
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return bss;
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}
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static struct ieee80211_bss *
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ieee80211_rx_mesh_bss_add(struct ieee80211_local *local, u8 *mesh_id, int mesh_id_len,
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u8 *mesh_cfg, int mesh_config_len, int freq)
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{
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struct ieee80211_bss *bss;
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if (mesh_config_len != MESH_CFG_LEN)
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return NULL;
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bss = kzalloc(sizeof(*bss), GFP_ATOMIC);
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if (!bss)
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return NULL;
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bss->mesh_cfg = kmalloc(MESH_CFG_CMP_LEN, GFP_ATOMIC);
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if (!bss->mesh_cfg) {
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kfree(bss);
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return NULL;
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}
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if (mesh_id_len && mesh_id_len <= IEEE80211_MAX_MESH_ID_LEN) {
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bss->mesh_id = kmalloc(mesh_id_len, GFP_ATOMIC);
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if (!bss->mesh_id) {
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kfree(bss->mesh_cfg);
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kfree(bss);
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return NULL;
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}
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memcpy(bss->mesh_id, mesh_id, mesh_id_len);
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}
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atomic_set(&bss->users, 2);
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memcpy(bss->mesh_cfg, mesh_cfg, MESH_CFG_CMP_LEN);
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bss->mesh_id_len = mesh_id_len;
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bss->freq = freq;
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spin_lock_bh(&local->bss_lock);
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/* TODO: order by RSSI? */
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list_add_tail(&bss->list, &local->bss_list);
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__ieee80211_rx_bss_hash_add(local, bss);
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spin_unlock_bh(&local->bss_lock);
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return bss;
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}
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#endif
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static void ieee80211_rx_bss_free(struct ieee80211_bss *bss)
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{
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kfree(bss->ies);
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kfree(bss_mesh_id(bss));
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kfree(bss_mesh_cfg(bss));
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kfree(bss);
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}
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void ieee80211_rx_bss_put(struct ieee80211_local *local,
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struct ieee80211_bss *bss)
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{
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local_bh_disable();
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if (!atomic_dec_and_lock(&bss->users, &local->bss_lock)) {
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local_bh_enable();
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return;
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}
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__ieee80211_rx_bss_hash_del(local, bss);
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list_del(&bss->list);
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spin_unlock_bh(&local->bss_lock);
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ieee80211_rx_bss_free(bss);
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}
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struct ieee80211_bss *
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ieee80211_bss_info_update(struct ieee80211_local *local,
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struct ieee80211_rx_status *rx_status,
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struct ieee80211_mgmt *mgmt,
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size_t len,
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struct ieee802_11_elems *elems,
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int freq, bool beacon)
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{
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struct ieee80211_bss *bss;
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int clen;
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#ifdef CONFIG_MAC80211_MESH
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if (elems->mesh_config)
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bss = ieee80211_rx_mesh_bss_get(local, elems->mesh_id,
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elems->mesh_id_len, elems->mesh_config, freq);
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else
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#endif
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bss = ieee80211_rx_bss_get(local, mgmt->bssid, freq,
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elems->ssid, elems->ssid_len);
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if (!bss) {
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#ifdef CONFIG_MAC80211_MESH
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if (elems->mesh_config)
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bss = ieee80211_rx_mesh_bss_add(local, elems->mesh_id,
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elems->mesh_id_len, elems->mesh_config,
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elems->mesh_config_len, freq);
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else
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#endif
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bss = ieee80211_rx_bss_add(local, mgmt->bssid, freq,
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elems->ssid, elems->ssid_len);
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if (!bss)
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return NULL;
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} else {
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#if 0
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/* TODO: order by RSSI? */
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spin_lock_bh(&local->bss_lock);
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list_move_tail(&bss->list, &local->bss_list);
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spin_unlock_bh(&local->bss_lock);
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#endif
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}
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/* save the ERP value so that it is available at association time */
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if (elems->erp_info && elems->erp_info_len >= 1) {
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bss->erp_value = elems->erp_info[0];
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bss->has_erp_value = 1;
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}
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bss->beacon_int = le16_to_cpu(mgmt->u.beacon.beacon_int);
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bss->capability = le16_to_cpu(mgmt->u.beacon.capab_info);
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if (elems->tim) {
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struct ieee80211_tim_ie *tim_ie =
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(struct ieee80211_tim_ie *)elems->tim;
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bss->dtim_period = tim_ie->dtim_period;
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}
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/* set default value for buggy APs */
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if (!elems->tim || bss->dtim_period == 0)
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bss->dtim_period = 1;
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bss->supp_rates_len = 0;
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if (elems->supp_rates) {
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clen = IEEE80211_MAX_SUPP_RATES - bss->supp_rates_len;
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if (clen > elems->supp_rates_len)
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clen = elems->supp_rates_len;
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memcpy(&bss->supp_rates[bss->supp_rates_len], elems->supp_rates,
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clen);
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bss->supp_rates_len += clen;
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}
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if (elems->ext_supp_rates) {
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clen = IEEE80211_MAX_SUPP_RATES - bss->supp_rates_len;
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if (clen > elems->ext_supp_rates_len)
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clen = elems->ext_supp_rates_len;
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memcpy(&bss->supp_rates[bss->supp_rates_len],
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elems->ext_supp_rates, clen);
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bss->supp_rates_len += clen;
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}
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bss->band = rx_status->band;
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bss->timestamp = le64_to_cpu(mgmt->u.beacon.timestamp);
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bss->last_update = jiffies;
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bss->signal = rx_status->signal;
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bss->noise = rx_status->noise;
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bss->qual = rx_status->qual;
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bss->wmm_used = elems->wmm_param || elems->wmm_info;
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if (!beacon)
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bss->last_probe_resp = jiffies;
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/*
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* For probe responses, or if we don't have any information yet,
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* use the IEs from the beacon.
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*/
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if (!bss->ies || !beacon) {
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if (bss->ies == NULL || bss->ies_len < elems->total_len) {
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kfree(bss->ies);
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bss->ies = kmalloc(elems->total_len, GFP_ATOMIC);
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}
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if (bss->ies) {
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memcpy(bss->ies, elems->ie_start, elems->total_len);
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bss->ies_len = elems->total_len;
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} else
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bss->ies_len = 0;
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}
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return bss;
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}
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ieee80211_rx_result
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ieee80211_scan_rx(struct ieee80211_sub_if_data *sdata, struct sk_buff *skb,
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struct ieee80211_rx_status *rx_status)
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{
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struct ieee80211_mgmt *mgmt;
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struct ieee80211_bss *bss;
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u8 *elements;
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struct ieee80211_channel *channel;
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size_t baselen;
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int freq;
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__le16 fc;
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bool presp, beacon = false;
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struct ieee802_11_elems elems;
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if (skb->len < 2)
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return RX_DROP_UNUSABLE;
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mgmt = (struct ieee80211_mgmt *) skb->data;
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fc = mgmt->frame_control;
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if (ieee80211_is_ctl(fc))
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return RX_CONTINUE;
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if (skb->len < 24)
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return RX_DROP_MONITOR;
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presp = ieee80211_is_probe_resp(fc);
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if (presp) {
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/* ignore ProbeResp to foreign address */
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if (memcmp(mgmt->da, sdata->dev->dev_addr, ETH_ALEN))
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return RX_DROP_MONITOR;
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presp = true;
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elements = mgmt->u.probe_resp.variable;
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baselen = offsetof(struct ieee80211_mgmt, u.probe_resp.variable);
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} else {
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beacon = ieee80211_is_beacon(fc);
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baselen = offsetof(struct ieee80211_mgmt, u.beacon.variable);
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elements = mgmt->u.beacon.variable;
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}
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if (!presp && !beacon)
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return RX_CONTINUE;
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if (baselen > skb->len)
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return RX_DROP_MONITOR;
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ieee802_11_parse_elems(elements, skb->len - baselen, &elems);
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if (elems.ds_params && elems.ds_params_len == 1)
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freq = ieee80211_channel_to_frequency(elems.ds_params[0]);
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else
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freq = rx_status->freq;
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channel = ieee80211_get_channel(sdata->local->hw.wiphy, freq);
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if (!channel || channel->flags & IEEE80211_CHAN_DISABLED)
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return RX_DROP_MONITOR;
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bss = ieee80211_bss_info_update(sdata->local, rx_status,
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mgmt, skb->len, &elems,
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freq, beacon);
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ieee80211_rx_bss_put(sdata->local, bss);
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dev_kfree_skb(skb);
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return RX_QUEUED;
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}
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static void ieee80211_send_nullfunc(struct ieee80211_local *local,
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struct ieee80211_sub_if_data *sdata,
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int powersave)
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{
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struct sk_buff *skb;
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struct ieee80211_hdr *nullfunc;
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__le16 fc;
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skb = dev_alloc_skb(local->hw.extra_tx_headroom + 24);
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if (!skb) {
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printk(KERN_DEBUG "%s: failed to allocate buffer for nullfunc "
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"frame\n", sdata->dev->name);
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return;
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}
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skb_reserve(skb, local->hw.extra_tx_headroom);
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nullfunc = (struct ieee80211_hdr *) skb_put(skb, 24);
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memset(nullfunc, 0, 24);
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fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_NULLFUNC |
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IEEE80211_FCTL_TODS);
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if (powersave)
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fc |= cpu_to_le16(IEEE80211_FCTL_PM);
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nullfunc->frame_control = fc;
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memcpy(nullfunc->addr1, sdata->u.sta.bssid, ETH_ALEN);
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memcpy(nullfunc->addr2, sdata->dev->dev_addr, ETH_ALEN);
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memcpy(nullfunc->addr3, sdata->u.sta.bssid, ETH_ALEN);
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ieee80211_tx_skb(sdata, skb, 0);
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}
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void ieee80211_scan_completed(struct ieee80211_hw *hw)
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{
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struct ieee80211_local *local = hw_to_local(hw);
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struct ieee80211_sub_if_data *sdata;
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union iwreq_data wrqu;
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if (WARN_ON(!local->hw_scanning && !local->sw_scanning))
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return;
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local->last_scan_completed = jiffies;
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memset(&wrqu, 0, sizeof(wrqu));
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/*
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* local->scan_sdata could have been NULLed by the interface
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* down code in case we were scanning on an interface that is
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* being taken down.
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*/
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sdata = local->scan_sdata;
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if (sdata)
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wireless_send_event(sdata->dev, SIOCGIWSCAN, &wrqu, NULL);
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if (local->hw_scanning) {
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local->hw_scanning = false;
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if (ieee80211_hw_config(local))
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printk(KERN_DEBUG "%s: failed to restore operational "
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"channel after scan\n", wiphy_name(local->hw.wiphy));
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goto done;
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}
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local->sw_scanning = false;
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if (ieee80211_hw_config(local))
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printk(KERN_DEBUG "%s: failed to restore operational "
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"channel after scan\n", wiphy_name(local->hw.wiphy));
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netif_tx_lock_bh(local->mdev);
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netif_addr_lock(local->mdev);
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local->filter_flags &= ~FIF_BCN_PRBRESP_PROMISC;
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|
local->ops->configure_filter(local_to_hw(local),
|
|
FIF_BCN_PRBRESP_PROMISC,
|
|
&local->filter_flags,
|
|
local->mdev->mc_count,
|
|
local->mdev->mc_list);
|
|
|
|
netif_addr_unlock(local->mdev);
|
|
netif_tx_unlock_bh(local->mdev);
|
|
|
|
rcu_read_lock();
|
|
list_for_each_entry_rcu(sdata, &local->interfaces, list) {
|
|
/* Tell AP we're back */
|
|
if (sdata->vif.type == NL80211_IFTYPE_STATION) {
|
|
if (sdata->u.sta.flags & IEEE80211_STA_ASSOCIATED) {
|
|
ieee80211_send_nullfunc(local, sdata, 0);
|
|
netif_tx_wake_all_queues(sdata->dev);
|
|
}
|
|
} else
|
|
netif_tx_wake_all_queues(sdata->dev);
|
|
}
|
|
rcu_read_unlock();
|
|
|
|
done:
|
|
ieee80211_mlme_notify_scan_completed(local);
|
|
ieee80211_mesh_notify_scan_completed(local);
|
|
}
|
|
EXPORT_SYMBOL(ieee80211_scan_completed);
|
|
|
|
|
|
void ieee80211_scan_work(struct work_struct *work)
|
|
{
|
|
struct ieee80211_local *local =
|
|
container_of(work, struct ieee80211_local, scan_work.work);
|
|
struct ieee80211_sub_if_data *sdata = local->scan_sdata;
|
|
struct ieee80211_supported_band *sband;
|
|
struct ieee80211_channel *chan;
|
|
int skip;
|
|
unsigned long next_delay = 0;
|
|
|
|
/*
|
|
* Avoid re-scheduling when the sdata is going away.
|
|
*/
|
|
if (!netif_running(sdata->dev))
|
|
return;
|
|
|
|
switch (local->scan_state) {
|
|
case SCAN_SET_CHANNEL:
|
|
/*
|
|
* Get current scan band. scan_band may be IEEE80211_NUM_BANDS
|
|
* after we successfully scanned the last channel of the last
|
|
* band (and the last band is supported by the hw)
|
|
*/
|
|
if (local->scan_band < IEEE80211_NUM_BANDS)
|
|
sband = local->hw.wiphy->bands[local->scan_band];
|
|
else
|
|
sband = NULL;
|
|
|
|
/*
|
|
* If we are at an unsupported band and have more bands
|
|
* left to scan, advance to the next supported one.
|
|
*/
|
|
while (!sband && local->scan_band < IEEE80211_NUM_BANDS - 1) {
|
|
local->scan_band++;
|
|
sband = local->hw.wiphy->bands[local->scan_band];
|
|
local->scan_channel_idx = 0;
|
|
}
|
|
|
|
/* if no more bands/channels left, complete scan */
|
|
if (!sband || local->scan_channel_idx >= sband->n_channels) {
|
|
ieee80211_scan_completed(local_to_hw(local));
|
|
return;
|
|
}
|
|
skip = 0;
|
|
chan = &sband->channels[local->scan_channel_idx];
|
|
|
|
if (chan->flags & IEEE80211_CHAN_DISABLED ||
|
|
(sdata->vif.type == NL80211_IFTYPE_ADHOC &&
|
|
chan->flags & IEEE80211_CHAN_NO_IBSS))
|
|
skip = 1;
|
|
|
|
if (!skip) {
|
|
local->scan_channel = chan;
|
|
if (ieee80211_hw_config(local)) {
|
|
printk(KERN_DEBUG "%s: failed to set freq to "
|
|
"%d MHz for scan\n", wiphy_name(local->hw.wiphy),
|
|
chan->center_freq);
|
|
skip = 1;
|
|
}
|
|
}
|
|
|
|
/* advance state machine to next channel/band */
|
|
local->scan_channel_idx++;
|
|
if (local->scan_channel_idx >= sband->n_channels) {
|
|
/*
|
|
* scan_band may end up == IEEE80211_NUM_BANDS, but
|
|
* we'll catch that case above and complete the scan
|
|
* if that is the case.
|
|
*/
|
|
local->scan_band++;
|
|
local->scan_channel_idx = 0;
|
|
}
|
|
|
|
if (skip)
|
|
break;
|
|
|
|
next_delay = IEEE80211_PROBE_DELAY +
|
|
usecs_to_jiffies(local->hw.channel_change_time);
|
|
local->scan_state = SCAN_SEND_PROBE;
|
|
break;
|
|
case SCAN_SEND_PROBE:
|
|
next_delay = IEEE80211_PASSIVE_CHANNEL_TIME;
|
|
local->scan_state = SCAN_SET_CHANNEL;
|
|
|
|
if (local->scan_channel->flags & IEEE80211_CHAN_PASSIVE_SCAN)
|
|
break;
|
|
ieee80211_send_probe_req(sdata, NULL, local->scan_ssid,
|
|
local->scan_ssid_len);
|
|
next_delay = IEEE80211_CHANNEL_TIME;
|
|
break;
|
|
}
|
|
|
|
queue_delayed_work(local->hw.workqueue, &local->scan_work,
|
|
next_delay);
|
|
}
|
|
|
|
|
|
int ieee80211_start_scan(struct ieee80211_sub_if_data *scan_sdata,
|
|
u8 *ssid, size_t ssid_len)
|
|
{
|
|
struct ieee80211_local *local = scan_sdata->local;
|
|
struct ieee80211_sub_if_data *sdata;
|
|
|
|
if (ssid_len > IEEE80211_MAX_SSID_LEN)
|
|
return -EINVAL;
|
|
|
|
/* MLME-SCAN.request (page 118) page 144 (11.1.3.1)
|
|
* BSSType: INFRASTRUCTURE, INDEPENDENT, ANY_BSS
|
|
* BSSID: MACAddress
|
|
* SSID
|
|
* ScanType: ACTIVE, PASSIVE
|
|
* ProbeDelay: delay (in microseconds) to be used prior to transmitting
|
|
* a Probe frame during active scanning
|
|
* ChannelList
|
|
* MinChannelTime (>= ProbeDelay), in TU
|
|
* MaxChannelTime: (>= MinChannelTime), in TU
|
|
*/
|
|
|
|
/* MLME-SCAN.confirm
|
|
* BSSDescriptionSet
|
|
* ResultCode: SUCCESS, INVALID_PARAMETERS
|
|
*/
|
|
|
|
if (local->sw_scanning || local->hw_scanning) {
|
|
if (local->scan_sdata == scan_sdata)
|
|
return 0;
|
|
return -EBUSY;
|
|
}
|
|
|
|
if (local->ops->hw_scan) {
|
|
int rc;
|
|
|
|
local->hw_scanning = true;
|
|
rc = local->ops->hw_scan(local_to_hw(local), ssid, ssid_len);
|
|
if (rc) {
|
|
local->hw_scanning = false;
|
|
return rc;
|
|
}
|
|
local->scan_sdata = scan_sdata;
|
|
return 0;
|
|
}
|
|
|
|
local->sw_scanning = true;
|
|
|
|
rcu_read_lock();
|
|
list_for_each_entry_rcu(sdata, &local->interfaces, list) {
|
|
if (sdata->vif.type == NL80211_IFTYPE_STATION) {
|
|
if (sdata->u.sta.flags & IEEE80211_STA_ASSOCIATED) {
|
|
netif_tx_stop_all_queues(sdata->dev);
|
|
ieee80211_send_nullfunc(local, sdata, 1);
|
|
}
|
|
} else
|
|
netif_tx_stop_all_queues(sdata->dev);
|
|
}
|
|
rcu_read_unlock();
|
|
|
|
if (ssid) {
|
|
local->scan_ssid_len = ssid_len;
|
|
memcpy(local->scan_ssid, ssid, ssid_len);
|
|
} else
|
|
local->scan_ssid_len = 0;
|
|
local->scan_state = SCAN_SET_CHANNEL;
|
|
local->scan_channel_idx = 0;
|
|
local->scan_band = IEEE80211_BAND_2GHZ;
|
|
local->scan_sdata = scan_sdata;
|
|
|
|
netif_addr_lock_bh(local->mdev);
|
|
local->filter_flags |= FIF_BCN_PRBRESP_PROMISC;
|
|
local->ops->configure_filter(local_to_hw(local),
|
|
FIF_BCN_PRBRESP_PROMISC,
|
|
&local->filter_flags,
|
|
local->mdev->mc_count,
|
|
local->mdev->mc_list);
|
|
netif_addr_unlock_bh(local->mdev);
|
|
|
|
/* TODO: start scan as soon as all nullfunc frames are ACKed */
|
|
queue_delayed_work(local->hw.workqueue, &local->scan_work,
|
|
IEEE80211_CHANNEL_TIME);
|
|
|
|
return 0;
|
|
}
|
|
|
|
|
|
int ieee80211_request_scan(struct ieee80211_sub_if_data *sdata,
|
|
u8 *ssid, size_t ssid_len)
|
|
{
|
|
struct ieee80211_local *local = sdata->local;
|
|
struct ieee80211_if_sta *ifsta;
|
|
|
|
if (sdata->vif.type != NL80211_IFTYPE_STATION)
|
|
return ieee80211_start_scan(sdata, ssid, ssid_len);
|
|
|
|
/*
|
|
* STA has a state machine that might need to defer scanning
|
|
* while it's trying to associate/authenticate, therefore we
|
|
* queue it up to the state machine in that case.
|
|
*/
|
|
|
|
if (local->sw_scanning || local->hw_scanning) {
|
|
if (local->scan_sdata == sdata)
|
|
return 0;
|
|
return -EBUSY;
|
|
}
|
|
|
|
ifsta = &sdata->u.sta;
|
|
|
|
ifsta->scan_ssid_len = ssid_len;
|
|
if (ssid_len)
|
|
memcpy(ifsta->scan_ssid, ssid, ssid_len);
|
|
set_bit(IEEE80211_STA_REQ_SCAN, &ifsta->request);
|
|
queue_work(local->hw.workqueue, &ifsta->work);
|
|
|
|
return 0;
|
|
}
|
|
|
|
|
|
static void ieee80211_scan_add_ies(struct iw_request_info *info,
|
|
struct ieee80211_bss *bss,
|
|
char **current_ev, char *end_buf)
|
|
{
|
|
u8 *pos, *end, *next;
|
|
struct iw_event iwe;
|
|
|
|
if (bss == NULL || bss->ies == NULL)
|
|
return;
|
|
|
|
/*
|
|
* If needed, fragment the IEs buffer (at IE boundaries) into short
|
|
* enough fragments to fit into IW_GENERIC_IE_MAX octet messages.
|
|
*/
|
|
pos = bss->ies;
|
|
end = pos + bss->ies_len;
|
|
|
|
while (end - pos > IW_GENERIC_IE_MAX) {
|
|
next = pos + 2 + pos[1];
|
|
while (next + 2 + next[1] - pos < IW_GENERIC_IE_MAX)
|
|
next = next + 2 + next[1];
|
|
|
|
memset(&iwe, 0, sizeof(iwe));
|
|
iwe.cmd = IWEVGENIE;
|
|
iwe.u.data.length = next - pos;
|
|
*current_ev = iwe_stream_add_point(info, *current_ev,
|
|
end_buf, &iwe, pos);
|
|
|
|
pos = next;
|
|
}
|
|
|
|
if (end > pos) {
|
|
memset(&iwe, 0, sizeof(iwe));
|
|
iwe.cmd = IWEVGENIE;
|
|
iwe.u.data.length = end - pos;
|
|
*current_ev = iwe_stream_add_point(info, *current_ev,
|
|
end_buf, &iwe, pos);
|
|
}
|
|
}
|
|
|
|
|
|
static char *
|
|
ieee80211_scan_result(struct ieee80211_local *local,
|
|
struct iw_request_info *info,
|
|
struct ieee80211_bss *bss,
|
|
char *current_ev, char *end_buf)
|
|
{
|
|
struct iw_event iwe;
|
|
char *buf;
|
|
|
|
if (time_after(jiffies,
|
|
bss->last_update + IEEE80211_SCAN_RESULT_EXPIRE))
|
|
return current_ev;
|
|
|
|
memset(&iwe, 0, sizeof(iwe));
|
|
iwe.cmd = SIOCGIWAP;
|
|
iwe.u.ap_addr.sa_family = ARPHRD_ETHER;
|
|
memcpy(iwe.u.ap_addr.sa_data, bss->bssid, ETH_ALEN);
|
|
current_ev = iwe_stream_add_event(info, current_ev, end_buf, &iwe,
|
|
IW_EV_ADDR_LEN);
|
|
|
|
memset(&iwe, 0, sizeof(iwe));
|
|
iwe.cmd = SIOCGIWESSID;
|
|
if (bss_mesh_cfg(bss)) {
|
|
iwe.u.data.length = bss_mesh_id_len(bss);
|
|
iwe.u.data.flags = 1;
|
|
current_ev = iwe_stream_add_point(info, current_ev, end_buf,
|
|
&iwe, bss_mesh_id(bss));
|
|
} else {
|
|
iwe.u.data.length = bss->ssid_len;
|
|
iwe.u.data.flags = 1;
|
|
current_ev = iwe_stream_add_point(info, current_ev, end_buf,
|
|
&iwe, bss->ssid);
|
|
}
|
|
|
|
if (bss->capability & (WLAN_CAPABILITY_ESS | WLAN_CAPABILITY_IBSS)
|
|
|| bss_mesh_cfg(bss)) {
|
|
memset(&iwe, 0, sizeof(iwe));
|
|
iwe.cmd = SIOCGIWMODE;
|
|
if (bss_mesh_cfg(bss))
|
|
iwe.u.mode = IW_MODE_MESH;
|
|
else if (bss->capability & WLAN_CAPABILITY_ESS)
|
|
iwe.u.mode = IW_MODE_MASTER;
|
|
else
|
|
iwe.u.mode = IW_MODE_ADHOC;
|
|
current_ev = iwe_stream_add_event(info, current_ev, end_buf,
|
|
&iwe, IW_EV_UINT_LEN);
|
|
}
|
|
|
|
memset(&iwe, 0, sizeof(iwe));
|
|
iwe.cmd = SIOCGIWFREQ;
|
|
iwe.u.freq.m = ieee80211_frequency_to_channel(bss->freq);
|
|
iwe.u.freq.e = 0;
|
|
current_ev = iwe_stream_add_event(info, current_ev, end_buf, &iwe,
|
|
IW_EV_FREQ_LEN);
|
|
|
|
memset(&iwe, 0, sizeof(iwe));
|
|
iwe.cmd = SIOCGIWFREQ;
|
|
iwe.u.freq.m = bss->freq;
|
|
iwe.u.freq.e = 6;
|
|
current_ev = iwe_stream_add_event(info, current_ev, end_buf, &iwe,
|
|
IW_EV_FREQ_LEN);
|
|
memset(&iwe, 0, sizeof(iwe));
|
|
iwe.cmd = IWEVQUAL;
|
|
iwe.u.qual.qual = bss->qual;
|
|
iwe.u.qual.level = bss->signal;
|
|
iwe.u.qual.noise = bss->noise;
|
|
iwe.u.qual.updated = local->wstats_flags;
|
|
current_ev = iwe_stream_add_event(info, current_ev, end_buf, &iwe,
|
|
IW_EV_QUAL_LEN);
|
|
|
|
memset(&iwe, 0, sizeof(iwe));
|
|
iwe.cmd = SIOCGIWENCODE;
|
|
if (bss->capability & WLAN_CAPABILITY_PRIVACY)
|
|
iwe.u.data.flags = IW_ENCODE_ENABLED | IW_ENCODE_NOKEY;
|
|
else
|
|
iwe.u.data.flags = IW_ENCODE_DISABLED;
|
|
iwe.u.data.length = 0;
|
|
current_ev = iwe_stream_add_point(info, current_ev, end_buf,
|
|
&iwe, "");
|
|
|
|
ieee80211_scan_add_ies(info, bss, ¤t_ev, end_buf);
|
|
|
|
if (bss->supp_rates_len > 0) {
|
|
/* display all supported rates in readable format */
|
|
char *p = current_ev + iwe_stream_lcp_len(info);
|
|
int i;
|
|
|
|
memset(&iwe, 0, sizeof(iwe));
|
|
iwe.cmd = SIOCGIWRATE;
|
|
/* Those two flags are ignored... */
|
|
iwe.u.bitrate.fixed = iwe.u.bitrate.disabled = 0;
|
|
|
|
for (i = 0; i < bss->supp_rates_len; i++) {
|
|
iwe.u.bitrate.value = ((bss->supp_rates[i] &
|
|
0x7f) * 500000);
|
|
p = iwe_stream_add_value(info, current_ev, p,
|
|
end_buf, &iwe, IW_EV_PARAM_LEN);
|
|
}
|
|
current_ev = p;
|
|
}
|
|
|
|
buf = kmalloc(30, GFP_ATOMIC);
|
|
if (buf) {
|
|
memset(&iwe, 0, sizeof(iwe));
|
|
iwe.cmd = IWEVCUSTOM;
|
|
sprintf(buf, "tsf=%016llx", (unsigned long long)(bss->timestamp));
|
|
iwe.u.data.length = strlen(buf);
|
|
current_ev = iwe_stream_add_point(info, current_ev, end_buf,
|
|
&iwe, buf);
|
|
memset(&iwe, 0, sizeof(iwe));
|
|
iwe.cmd = IWEVCUSTOM;
|
|
sprintf(buf, " Last beacon: %dms ago",
|
|
jiffies_to_msecs(jiffies - bss->last_update));
|
|
iwe.u.data.length = strlen(buf);
|
|
current_ev = iwe_stream_add_point(info, current_ev,
|
|
end_buf, &iwe, buf);
|
|
kfree(buf);
|
|
}
|
|
|
|
if (bss_mesh_cfg(bss)) {
|
|
u8 *cfg = bss_mesh_cfg(bss);
|
|
buf = kmalloc(50, GFP_ATOMIC);
|
|
if (buf) {
|
|
memset(&iwe, 0, sizeof(iwe));
|
|
iwe.cmd = IWEVCUSTOM;
|
|
sprintf(buf, "Mesh network (version %d)", cfg[0]);
|
|
iwe.u.data.length = strlen(buf);
|
|
current_ev = iwe_stream_add_point(info, current_ev,
|
|
end_buf,
|
|
&iwe, buf);
|
|
sprintf(buf, "Path Selection Protocol ID: "
|
|
"0x%02X%02X%02X%02X", cfg[1], cfg[2], cfg[3],
|
|
cfg[4]);
|
|
iwe.u.data.length = strlen(buf);
|
|
current_ev = iwe_stream_add_point(info, current_ev,
|
|
end_buf,
|
|
&iwe, buf);
|
|
sprintf(buf, "Path Selection Metric ID: "
|
|
"0x%02X%02X%02X%02X", cfg[5], cfg[6], cfg[7],
|
|
cfg[8]);
|
|
iwe.u.data.length = strlen(buf);
|
|
current_ev = iwe_stream_add_point(info, current_ev,
|
|
end_buf,
|
|
&iwe, buf);
|
|
sprintf(buf, "Congestion Control Mode ID: "
|
|
"0x%02X%02X%02X%02X", cfg[9], cfg[10],
|
|
cfg[11], cfg[12]);
|
|
iwe.u.data.length = strlen(buf);
|
|
current_ev = iwe_stream_add_point(info, current_ev,
|
|
end_buf,
|
|
&iwe, buf);
|
|
sprintf(buf, "Channel Precedence: "
|
|
"0x%02X%02X%02X%02X", cfg[13], cfg[14],
|
|
cfg[15], cfg[16]);
|
|
iwe.u.data.length = strlen(buf);
|
|
current_ev = iwe_stream_add_point(info, current_ev,
|
|
end_buf,
|
|
&iwe, buf);
|
|
kfree(buf);
|
|
}
|
|
}
|
|
|
|
return current_ev;
|
|
}
|
|
|
|
|
|
int ieee80211_scan_results(struct ieee80211_local *local,
|
|
struct iw_request_info *info,
|
|
char *buf, size_t len)
|
|
{
|
|
char *current_ev = buf;
|
|
char *end_buf = buf + len;
|
|
struct ieee80211_bss *bss;
|
|
|
|
spin_lock_bh(&local->bss_lock);
|
|
list_for_each_entry(bss, &local->bss_list, list) {
|
|
if (buf + len - current_ev <= IW_EV_ADDR_LEN) {
|
|
spin_unlock_bh(&local->bss_lock);
|
|
return -E2BIG;
|
|
}
|
|
current_ev = ieee80211_scan_result(local, info, bss,
|
|
current_ev, end_buf);
|
|
}
|
|
spin_unlock_bh(&local->bss_lock);
|
|
return current_ev - buf;
|
|
}
|