[T106][ZXW-22]7520V3SCV2.01.01.02P42U09_VEC_V0.8_AP_VEC origin source commit
Change-Id: Ic6e05d89ecd62fc34f82b23dcf306c93764aec4b
diff --git a/ap/os/linux/linux-3.4.x/net/mac80211/ibss.c b/ap/os/linux/linux-3.4.x/net/mac80211/ibss.c
new file mode 100644
index 0000000..50191a3
--- /dev/null
+++ b/ap/os/linux/linux-3.4.x/net/mac80211/ibss.c
@@ -0,0 +1,1217 @@
+/*
+ * IBSS mode implementation
+ * Copyright 2003-2008, Jouni Malinen <j@w1.fi>
+ * Copyright 2004, Instant802 Networks, Inc.
+ * Copyright 2005, Devicescape Software, Inc.
+ * Copyright 2006-2007 Jiri Benc <jbenc@suse.cz>
+ * Copyright 2007, Michael Wu <flamingice@sourmilk.net>
+ * Copyright 2009, Johannes Berg <johannes@sipsolutions.net>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#include <linux/delay.h>
+#include <linux/slab.h>
+#include <linux/if_ether.h>
+#include <linux/skbuff.h>
+#include <linux/if_arp.h>
+#include <linux/etherdevice.h>
+#include <linux/rtnetlink.h>
+#include <net/mac80211.h>
+
+#include "ieee80211_i.h"
+#include "driver-ops.h"
+#include "rate.h"
+
+#define IEEE80211_SCAN_INTERVAL (2 * HZ)
+#define IEEE80211_SCAN_INTERVAL_SLOW (15 * HZ)
+#define IEEE80211_IBSS_JOIN_TIMEOUT (7 * HZ)
+
+#define IEEE80211_IBSS_MERGE_INTERVAL (30 * HZ)
+#define IEEE80211_IBSS_INACTIVITY_LIMIT (60 * HZ)
+
+#define IEEE80211_IBSS_MAX_STA_ENTRIES 128
+
+
+static void __ieee80211_sta_join_ibss(struct ieee80211_sub_if_data *sdata,
+ const u8 *bssid, const int beacon_int,
+ struct ieee80211_channel *chan,
+ const u32 basic_rates,
+ const u16 capability, u64 tsf)
+{
+ struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
+ struct ieee80211_local *local = sdata->local;
+ int rates, i;
+ struct sk_buff *skb;
+ struct ieee80211_mgmt *mgmt;
+ u8 *pos;
+ struct ieee80211_supported_band *sband;
+ struct cfg80211_bss *bss;
+ u32 bss_change;
+ u8 supp_rates[IEEE80211_MAX_SUPP_RATES];
+ enum nl80211_channel_type channel_type;
+
+ lockdep_assert_held(&ifibss->mtx);
+
+ /* Reset own TSF to allow time synchronization work. */
+ drv_reset_tsf(local, sdata);
+
+ skb = ifibss->skb;
+ RCU_INIT_POINTER(ifibss->presp, NULL);
+ synchronize_rcu();
+ skb->data = skb->head;
+ skb->len = 0;
+ skb_reset_tail_pointer(skb);
+ skb_reserve(skb, sdata->local->hw.extra_tx_headroom);
+
+ if (compare_ether_addr(ifibss->bssid, bssid))
+ sta_info_flush(sdata->local, sdata);
+
+ /* if merging, indicate to driver that we leave the old IBSS */
+ if (sdata->vif.bss_conf.ibss_joined) {
+ sdata->vif.bss_conf.ibss_joined = false;
+ netif_carrier_off(sdata->dev);
+ ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_IBSS);
+ }
+
+ memcpy(ifibss->bssid, bssid, ETH_ALEN);
+
+ sdata->drop_unencrypted = capability & WLAN_CAPABILITY_PRIVACY ? 1 : 0;
+
+ local->oper_channel = chan;
+ channel_type = ifibss->channel_type;
+ if (channel_type > NL80211_CHAN_HT20 &&
+ !cfg80211_can_beacon_sec_chan(local->hw.wiphy, chan, channel_type))
+ channel_type = NL80211_CHAN_HT20;
+ if (!ieee80211_set_channel_type(local, sdata, channel_type)) {
+ /* can only fail due to HT40+/- mismatch */
+ channel_type = NL80211_CHAN_HT20;
+ WARN_ON(!ieee80211_set_channel_type(local, sdata,
+ NL80211_CHAN_HT20));
+ }
+ ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_CHANNEL);
+
+ sband = local->hw.wiphy->bands[chan->band];
+
+ /* build supported rates array */
+ pos = supp_rates;
+ for (i = 0; i < sband->n_bitrates; i++) {
+ int rate = sband->bitrates[i].bitrate;
+ u8 basic = 0;
+ if (basic_rates & BIT(i))
+ basic = 0x80;
+ *pos++ = basic | (u8) (rate / 5);
+ }
+
+ /* Build IBSS probe response */
+ mgmt = (void *) skb_put(skb, 24 + sizeof(mgmt->u.beacon));
+ memset(mgmt, 0, 24 + sizeof(mgmt->u.beacon));
+ mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
+ IEEE80211_STYPE_PROBE_RESP);
+ memset(mgmt->da, 0xff, ETH_ALEN);
+ memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
+ memcpy(mgmt->bssid, ifibss->bssid, ETH_ALEN);
+ mgmt->u.beacon.beacon_int = cpu_to_le16(beacon_int);
+ mgmt->u.beacon.timestamp = cpu_to_le64(tsf);
+ mgmt->u.beacon.capab_info = cpu_to_le16(capability);
+
+ pos = skb_put(skb, 2 + ifibss->ssid_len);
+ *pos++ = WLAN_EID_SSID;
+ *pos++ = ifibss->ssid_len;
+ memcpy(pos, ifibss->ssid, ifibss->ssid_len);
+
+ rates = sband->n_bitrates;
+ if (rates > 8)
+ rates = 8;
+ pos = skb_put(skb, 2 + rates);
+ *pos++ = WLAN_EID_SUPP_RATES;
+ *pos++ = rates;
+ memcpy(pos, supp_rates, rates);
+
+ if (sband->band == IEEE80211_BAND_2GHZ) {
+ pos = skb_put(skb, 2 + 1);
+ *pos++ = WLAN_EID_DS_PARAMS;
+ *pos++ = 1;
+ *pos++ = ieee80211_frequency_to_channel(chan->center_freq);
+ }
+
+ pos = skb_put(skb, 2 + 2);
+ *pos++ = WLAN_EID_IBSS_PARAMS;
+ *pos++ = 2;
+ /* FIX: set ATIM window based on scan results */
+ *pos++ = 0;
+ *pos++ = 0;
+
+ if (sband->n_bitrates > 8) {
+ rates = sband->n_bitrates - 8;
+ pos = skb_put(skb, 2 + rates);
+ *pos++ = WLAN_EID_EXT_SUPP_RATES;
+ *pos++ = rates;
+ memcpy(pos, &supp_rates[8], rates);
+ }
+
+ if (ifibss->ie_len)
+ memcpy(skb_put(skb, ifibss->ie_len),
+ ifibss->ie, ifibss->ie_len);
+
+ /* add HT capability and information IEs */
+ if (channel_type && sband->ht_cap.ht_supported) {
+ pos = skb_put(skb, 4 +
+ sizeof(struct ieee80211_ht_cap) +
+ sizeof(struct ieee80211_ht_info));
+ pos = ieee80211_ie_build_ht_cap(pos, &sband->ht_cap,
+ sband->ht_cap.cap);
+ pos = ieee80211_ie_build_ht_info(pos,
+ &sband->ht_cap,
+ chan,
+ channel_type);
+ }
+
+ if (local->hw.queues >= 4) {
+ pos = skb_put(skb, 9);
+ *pos++ = WLAN_EID_VENDOR_SPECIFIC;
+ *pos++ = 7; /* len */
+ *pos++ = 0x00; /* Microsoft OUI 00:50:F2 */
+ *pos++ = 0x50;
+ *pos++ = 0xf2;
+ *pos++ = 2; /* WME */
+ *pos++ = 0; /* WME info */
+ *pos++ = 1; /* WME ver */
+ *pos++ = 0; /* U-APSD no in use */
+ }
+
+ rcu_assign_pointer(ifibss->presp, skb);
+
+ sdata->vif.bss_conf.beacon_int = beacon_int;
+ sdata->vif.bss_conf.basic_rates = basic_rates;
+ bss_change = BSS_CHANGED_BEACON_INT;
+ bss_change |= ieee80211_reset_erp_info(sdata);
+ bss_change |= BSS_CHANGED_BSSID;
+ bss_change |= BSS_CHANGED_BEACON;
+ bss_change |= BSS_CHANGED_BEACON_ENABLED;
+ bss_change |= BSS_CHANGED_BASIC_RATES;
+ bss_change |= BSS_CHANGED_HT;
+ bss_change |= BSS_CHANGED_IBSS;
+ sdata->vif.bss_conf.ibss_joined = true;
+ ieee80211_bss_info_change_notify(sdata, bss_change);
+
+ ieee80211_sta_def_wmm_params(sdata, sband->n_bitrates, supp_rates);
+
+ ifibss->state = IEEE80211_IBSS_MLME_JOINED;
+ mod_timer(&ifibss->timer,
+ round_jiffies(jiffies + IEEE80211_IBSS_MERGE_INTERVAL));
+
+ bss = cfg80211_inform_bss_frame(local->hw.wiphy, local->hw.conf.channel,
+ mgmt, skb->len, 0, GFP_KERNEL);
+ cfg80211_put_bss(bss);
+ netif_carrier_on(sdata->dev);
+ cfg80211_ibss_joined(sdata->dev, ifibss->bssid, GFP_KERNEL);
+}
+
+static void ieee80211_sta_join_ibss(struct ieee80211_sub_if_data *sdata,
+ struct ieee80211_bss *bss)
+{
+ struct cfg80211_bss *cbss =
+ container_of((void *)bss, struct cfg80211_bss, priv);
+ struct ieee80211_supported_band *sband;
+ u32 basic_rates;
+ int i, j;
+ u16 beacon_int = cbss->beacon_interval;
+
+ lockdep_assert_held(&sdata->u.ibss.mtx);
+
+ if (beacon_int < 10)
+ beacon_int = 10;
+
+ sband = sdata->local->hw.wiphy->bands[cbss->channel->band];
+
+ basic_rates = 0;
+
+ for (i = 0; i < bss->supp_rates_len; i++) {
+ int rate = (bss->supp_rates[i] & 0x7f) * 5;
+ bool is_basic = !!(bss->supp_rates[i] & 0x80);
+
+ for (j = 0; j < sband->n_bitrates; j++) {
+ if (sband->bitrates[j].bitrate == rate) {
+ if (is_basic)
+ basic_rates |= BIT(j);
+ break;
+ }
+ }
+ }
+
+ __ieee80211_sta_join_ibss(sdata, cbss->bssid,
+ beacon_int,
+ cbss->channel,
+ basic_rates,
+ cbss->capability,
+ cbss->tsf);
+}
+
+static struct sta_info *ieee80211_ibss_finish_sta(struct sta_info *sta,
+ bool auth)
+ __acquires(RCU)
+{
+ struct ieee80211_sub_if_data *sdata = sta->sdata;
+ u8 addr[ETH_ALEN];
+
+ memcpy(addr, sta->sta.addr, ETH_ALEN);
+
+#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
+ wiphy_debug(sdata->local->hw.wiphy,
+ "Adding new IBSS station %pM (dev=%s)\n",
+ addr, sdata->name);
+#endif
+
+ sta_info_pre_move_state(sta, IEEE80211_STA_AUTH);
+ sta_info_pre_move_state(sta, IEEE80211_STA_ASSOC);
+ /* authorize the station only if the network is not RSN protected. If
+ * not wait for the userspace to authorize it */
+ if (!sta->sdata->u.ibss.control_port)
+ sta_info_pre_move_state(sta, IEEE80211_STA_AUTHORIZED);
+
+ rate_control_rate_init(sta);
+
+ /* If it fails, maybe we raced another insertion? */
+ if (sta_info_insert_rcu(sta))
+ return sta_info_get(sdata, addr);
+ if (auth) {
+#ifdef CONFIG_MAC80211_IBSS_DEBUG
+ printk(KERN_DEBUG "TX Auth SA=%pM DA=%pM BSSID=%pM"
+ "(auth_transaction=1)\n", sdata->vif.addr,
+ sdata->u.ibss.bssid, addr);
+#endif
+ ieee80211_send_auth(sdata, 1, WLAN_AUTH_OPEN, NULL, 0,
+ addr, sdata->u.ibss.bssid, NULL, 0, 0);
+ }
+ return sta;
+}
+
+static struct sta_info *
+ieee80211_ibss_add_sta(struct ieee80211_sub_if_data *sdata,
+ const u8 *bssid, const u8 *addr,
+ u32 supp_rates, bool auth)
+ __acquires(RCU)
+{
+ struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
+ struct ieee80211_local *local = sdata->local;
+ struct sta_info *sta;
+ int band = local->hw.conf.channel->band;
+
+ /*
+ * XXX: Consider removing the least recently used entry and
+ * allow new one to be added.
+ */
+ if (local->num_sta >= IEEE80211_IBSS_MAX_STA_ENTRIES) {
+ if (net_ratelimit())
+ printk(KERN_DEBUG "%s: No room for a new IBSS STA entry %pM\n",
+ sdata->name, addr);
+ rcu_read_lock();
+ return NULL;
+ }
+
+ if (ifibss->state == IEEE80211_IBSS_MLME_SEARCH) {
+ rcu_read_lock();
+ return NULL;
+ }
+
+ if (compare_ether_addr(bssid, sdata->u.ibss.bssid)) {
+ rcu_read_lock();
+ return NULL;
+ }
+
+ sta = sta_info_alloc(sdata, addr, GFP_KERNEL);
+ if (!sta) {
+ rcu_read_lock();
+ return NULL;
+ }
+
+ sta->last_rx = jiffies;
+
+ /* make sure mandatory rates are always added */
+ sta->sta.supp_rates[band] = supp_rates |
+ ieee80211_mandatory_rates(local, band);
+
+ return ieee80211_ibss_finish_sta(sta, auth);
+}
+
+static void ieee80211_rx_mgmt_auth_ibss(struct ieee80211_sub_if_data *sdata,
+ struct ieee80211_mgmt *mgmt,
+ size_t len)
+{
+ u16 auth_alg, auth_transaction;
+
+ lockdep_assert_held(&sdata->u.ibss.mtx);
+
+ if (len < 24 + 6)
+ return;
+
+ auth_alg = le16_to_cpu(mgmt->u.auth.auth_alg);
+ auth_transaction = le16_to_cpu(mgmt->u.auth.auth_transaction);
+
+ if (auth_alg != WLAN_AUTH_OPEN || auth_transaction != 1)
+ return;
+#ifdef CONFIG_MAC80211_IBSS_DEBUG
+ printk(KERN_DEBUG "%s: RX Auth SA=%pM DA=%pM BSSID=%pM."
+ "(auth_transaction=%d)\n",
+ sdata->name, mgmt->sa, mgmt->da, mgmt->bssid, auth_transaction);
+#endif
+ sta_info_destroy_addr(sdata, mgmt->sa);
+ ieee80211_ibss_add_sta(sdata, mgmt->bssid, mgmt->sa, 0, false);
+ rcu_read_unlock();
+
+ /*
+ * IEEE 802.11 standard does not require authentication in IBSS
+ * networks and most implementations do not seem to use it.
+ * However, try to reply to authentication attempts if someone
+ * has actually implemented this.
+ */
+ ieee80211_send_auth(sdata, 2, WLAN_AUTH_OPEN, NULL, 0,
+ mgmt->sa, sdata->u.ibss.bssid, NULL, 0, 0);
+}
+
+static void ieee80211_rx_bss_info(struct ieee80211_sub_if_data *sdata,
+ struct ieee80211_mgmt *mgmt,
+ size_t len,
+ struct ieee80211_rx_status *rx_status,
+ struct ieee802_11_elems *elems,
+ bool beacon)
+{
+ struct ieee80211_local *local = sdata->local;
+ int freq;
+ struct cfg80211_bss *cbss;
+ struct ieee80211_bss *bss;
+ struct sta_info *sta;
+ struct ieee80211_channel *channel;
+ u64 beacon_timestamp, rx_timestamp;
+ u32 supp_rates = 0;
+ enum ieee80211_band band = rx_status->band;
+ struct ieee80211_supported_band *sband = local->hw.wiphy->bands[band];
+ bool rates_updated = false;
+
+ if (elems->ds_params && elems->ds_params_len == 1)
+ freq = ieee80211_channel_to_frequency(elems->ds_params[0],
+ band);
+ else
+ freq = rx_status->freq;
+
+ channel = ieee80211_get_channel(local->hw.wiphy, freq);
+
+ if (!channel || channel->flags & IEEE80211_CHAN_DISABLED)
+ return;
+
+ if (sdata->vif.type == NL80211_IFTYPE_ADHOC &&
+ compare_ether_addr(mgmt->bssid, sdata->u.ibss.bssid) == 0) {
+
+ rcu_read_lock();
+ sta = sta_info_get(sdata, mgmt->sa);
+
+ if (elems->supp_rates) {
+ supp_rates = ieee80211_sta_get_rates(local, elems,
+ band);
+ if (sta) {
+ u32 prev_rates;
+
+ prev_rates = sta->sta.supp_rates[band];
+ /* make sure mandatory rates are always added */
+ sta->sta.supp_rates[band] = supp_rates |
+ ieee80211_mandatory_rates(local, band);
+
+ if (sta->sta.supp_rates[band] != prev_rates) {
+#ifdef CONFIG_MAC80211_IBSS_DEBUG
+ printk(KERN_DEBUG
+ "%s: updated supp_rates set "
+ "for %pM based on beacon"
+ "/probe_resp (0x%x -> 0x%x)\n",
+ sdata->name, sta->sta.addr,
+ prev_rates,
+ sta->sta.supp_rates[band]);
+#endif
+ rates_updated = true;
+ }
+ } else {
+ rcu_read_unlock();
+ sta = ieee80211_ibss_add_sta(sdata, mgmt->bssid,
+ mgmt->sa, supp_rates, true);
+ }
+ }
+
+ if (sta && elems->wmm_info)
+ set_sta_flag(sta, WLAN_STA_WME);
+
+ if (sta && elems->ht_info_elem && elems->ht_cap_elem &&
+ sdata->u.ibss.channel_type != NL80211_CHAN_NO_HT) {
+ /* we both use HT */
+ struct ieee80211_sta_ht_cap sta_ht_cap_new;
+ enum nl80211_channel_type channel_type =
+ ieee80211_ht_info_to_channel_type(
+ elems->ht_info_elem);
+
+ ieee80211_ht_cap_ie_to_sta_ht_cap(sdata, sband,
+ elems->ht_cap_elem,
+ &sta_ht_cap_new);
+
+ /*
+ * fall back to HT20 if we don't use or use
+ * the other extension channel
+ */
+ if (!(channel_type == NL80211_CHAN_HT40MINUS ||
+ channel_type == NL80211_CHAN_HT40PLUS) ||
+ channel_type != sdata->u.ibss.channel_type)
+ sta_ht_cap_new.cap &=
+ ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
+
+ if (memcmp(&sta->sta.ht_cap, &sta_ht_cap_new,
+ sizeof(sta_ht_cap_new))) {
+ memcpy(&sta->sta.ht_cap, &sta_ht_cap_new,
+ sizeof(sta_ht_cap_new));
+ rates_updated = true;
+ }
+ }
+
+ if (sta && rates_updated)
+ rate_control_rate_init(sta);
+
+ rcu_read_unlock();
+ }
+
+ bss = ieee80211_bss_info_update(local, rx_status, mgmt, len, elems,
+ channel, beacon);
+ if (!bss)
+ return;
+
+ cbss = container_of((void *)bss, struct cfg80211_bss, priv);
+
+ /* was just updated in ieee80211_bss_info_update */
+ beacon_timestamp = cbss->tsf;
+
+ /* check if we need to merge IBSS */
+
+ /* we use a fixed BSSID */
+ if (sdata->u.ibss.fixed_bssid)
+ goto put_bss;
+
+ /* not an IBSS */
+ if (!(cbss->capability & WLAN_CAPABILITY_IBSS))
+ goto put_bss;
+
+ /* different channel */
+ if (cbss->channel != local->oper_channel)
+ goto put_bss;
+
+ /* different SSID */
+ if (elems->ssid_len != sdata->u.ibss.ssid_len ||
+ memcmp(elems->ssid, sdata->u.ibss.ssid,
+ sdata->u.ibss.ssid_len))
+ goto put_bss;
+
+ /* same BSSID */
+ if (compare_ether_addr(cbss->bssid, sdata->u.ibss.bssid) == 0)
+ goto put_bss;
+
+ if (rx_status->flag & RX_FLAG_MACTIME_MPDU) {
+ /*
+ * For correct IBSS merging we need mactime; since mactime is
+ * defined as the time the first data symbol of the frame hits
+ * the PHY, and the timestamp of the beacon is defined as "the
+ * time that the data symbol containing the first bit of the
+ * timestamp is transmitted to the PHY plus the transmitting
+ * STA's delays through its local PHY from the MAC-PHY
+ * interface to its interface with the WM" (802.11 11.1.2)
+ * - equals the time this bit arrives at the receiver - we have
+ * to take into account the offset between the two.
+ *
+ * E.g. at 1 MBit that means mactime is 192 usec earlier
+ * (=24 bytes * 8 usecs/byte) than the beacon timestamp.
+ */
+ int rate;
+
+ if (rx_status->flag & RX_FLAG_HT)
+ rate = 65; /* TODO: HT rates */
+ else
+ rate = local->hw.wiphy->bands[band]->
+ bitrates[rx_status->rate_idx].bitrate;
+
+ rx_timestamp = rx_status->mactime + (24 * 8 * 10 / rate);
+ } else {
+ /*
+ * second best option: get current TSF
+ * (will return -1 if not supported)
+ */
+ rx_timestamp = drv_get_tsf(local, sdata);
+ }
+
+#ifdef CONFIG_MAC80211_IBSS_DEBUG
+ printk(KERN_DEBUG "RX beacon SA=%pM BSSID="
+ "%pM TSF=0x%llx BCN=0x%llx diff=%lld @%lu\n",
+ mgmt->sa, mgmt->bssid,
+ (unsigned long long)rx_timestamp,
+ (unsigned long long)beacon_timestamp,
+ (unsigned long long)(rx_timestamp - beacon_timestamp),
+ jiffies);
+#endif
+
+ if (beacon_timestamp > rx_timestamp) {
+#ifdef CONFIG_MAC80211_IBSS_DEBUG
+ printk(KERN_DEBUG "%s: beacon TSF higher than "
+ "local TSF - IBSS merge with BSSID %pM\n",
+ sdata->name, mgmt->bssid);
+#endif
+ ieee80211_sta_join_ibss(sdata, bss);
+ supp_rates = ieee80211_sta_get_rates(local, elems, band);
+ ieee80211_ibss_add_sta(sdata, mgmt->bssid, mgmt->sa,
+ supp_rates, true);
+ rcu_read_unlock();
+ }
+
+ put_bss:
+ ieee80211_rx_bss_put(local, bss);
+}
+
+void ieee80211_ibss_rx_no_sta(struct ieee80211_sub_if_data *sdata,
+ const u8 *bssid, const u8 *addr,
+ u32 supp_rates)
+{
+ struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
+ struct ieee80211_local *local = sdata->local;
+ struct sta_info *sta;
+ int band = local->hw.conf.channel->band;
+
+ /*
+ * XXX: Consider removing the least recently used entry and
+ * allow new one to be added.
+ */
+ if (local->num_sta >= IEEE80211_IBSS_MAX_STA_ENTRIES) {
+ if (net_ratelimit())
+ printk(KERN_DEBUG "%s: No room for a new IBSS STA entry %pM\n",
+ sdata->name, addr);
+ return;
+ }
+
+ if (ifibss->state == IEEE80211_IBSS_MLME_SEARCH)
+ return;
+
+ if (compare_ether_addr(bssid, sdata->u.ibss.bssid))
+ return;
+
+ sta = sta_info_alloc(sdata, addr, GFP_ATOMIC);
+ if (!sta)
+ return;
+
+ sta->last_rx = jiffies;
+
+ /* make sure mandatory rates are always added */
+ sta->sta.supp_rates[band] = supp_rates |
+ ieee80211_mandatory_rates(local, band);
+
+ spin_lock(&ifibss->incomplete_lock);
+ list_add(&sta->list, &ifibss->incomplete_stations);
+ spin_unlock(&ifibss->incomplete_lock);
+ ieee80211_queue_work(&local->hw, &sdata->work);
+}
+
+static int ieee80211_sta_active_ibss(struct ieee80211_sub_if_data *sdata)
+{
+ struct ieee80211_local *local = sdata->local;
+ int active = 0;
+ struct sta_info *sta;
+
+ lockdep_assert_held(&sdata->u.ibss.mtx);
+
+ rcu_read_lock();
+
+ list_for_each_entry_rcu(sta, &local->sta_list, list) {
+ if (sta->sdata == sdata &&
+ time_after(sta->last_rx + IEEE80211_IBSS_MERGE_INTERVAL,
+ jiffies)) {
+ active++;
+ break;
+ }
+ }
+
+ rcu_read_unlock();
+
+ return active;
+}
+
+/*
+ * This function is called with state == IEEE80211_IBSS_MLME_JOINED
+ */
+
+static void ieee80211_sta_merge_ibss(struct ieee80211_sub_if_data *sdata)
+{
+ struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
+
+ lockdep_assert_held(&ifibss->mtx);
+
+ mod_timer(&ifibss->timer,
+ round_jiffies(jiffies + IEEE80211_IBSS_MERGE_INTERVAL));
+
+ ieee80211_sta_expire(sdata, IEEE80211_IBSS_INACTIVITY_LIMIT);
+
+ if (time_before(jiffies, ifibss->last_scan_completed +
+ IEEE80211_IBSS_MERGE_INTERVAL))
+ return;
+
+ if (ieee80211_sta_active_ibss(sdata))
+ return;
+
+ if (ifibss->fixed_channel)
+ return;
+
+ printk(KERN_DEBUG "%s: No active IBSS STAs - trying to scan for other "
+ "IBSS networks with same SSID (merge)\n", sdata->name);
+
+ ieee80211_request_ibss_scan(sdata, ifibss->ssid, ifibss->ssid_len,
+ NULL);
+}
+
+static void ieee80211_sta_create_ibss(struct ieee80211_sub_if_data *sdata)
+{
+ struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
+ u8 bssid[ETH_ALEN];
+ u16 capability;
+ int i;
+
+ lockdep_assert_held(&ifibss->mtx);
+
+ if (ifibss->fixed_bssid) {
+ memcpy(bssid, ifibss->bssid, ETH_ALEN);
+ } else {
+ /* Generate random, not broadcast, locally administered BSSID. Mix in
+ * own MAC address to make sure that devices that do not have proper
+ * random number generator get different BSSID. */
+ get_random_bytes(bssid, ETH_ALEN);
+ for (i = 0; i < ETH_ALEN; i++)
+ bssid[i] ^= sdata->vif.addr[i];
+ bssid[0] &= ~0x01;
+ bssid[0] |= 0x02;
+ }
+
+ printk(KERN_DEBUG "%s: Creating new IBSS network, BSSID %pM\n",
+ sdata->name, bssid);
+
+ capability = WLAN_CAPABILITY_IBSS;
+
+ if (ifibss->privacy)
+ capability |= WLAN_CAPABILITY_PRIVACY;
+ else
+ sdata->drop_unencrypted = 0;
+
+ __ieee80211_sta_join_ibss(sdata, bssid, sdata->vif.bss_conf.beacon_int,
+ ifibss->channel, ifibss->basic_rates,
+ capability, 0);
+}
+
+/*
+ * This function is called with state == IEEE80211_IBSS_MLME_SEARCH
+ */
+
+static void ieee80211_sta_find_ibss(struct ieee80211_sub_if_data *sdata)
+{
+ struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
+ struct ieee80211_local *local = sdata->local;
+ struct cfg80211_bss *cbss;
+ struct ieee80211_channel *chan = NULL;
+ const u8 *bssid = NULL;
+ int active_ibss;
+ u16 capability;
+
+ lockdep_assert_held(&ifibss->mtx);
+
+ active_ibss = ieee80211_sta_active_ibss(sdata);
+#ifdef CONFIG_MAC80211_IBSS_DEBUG
+ printk(KERN_DEBUG "%s: sta_find_ibss (active_ibss=%d)\n",
+ sdata->name, active_ibss);
+#endif /* CONFIG_MAC80211_IBSS_DEBUG */
+
+ if (active_ibss)
+ return;
+
+ capability = WLAN_CAPABILITY_IBSS;
+ if (ifibss->privacy)
+ capability |= WLAN_CAPABILITY_PRIVACY;
+ if (ifibss->fixed_bssid)
+ bssid = ifibss->bssid;
+ if (ifibss->fixed_channel)
+ chan = ifibss->channel;
+ if (!is_zero_ether_addr(ifibss->bssid))
+ bssid = ifibss->bssid;
+ cbss = cfg80211_get_bss(local->hw.wiphy, chan, bssid,
+ ifibss->ssid, ifibss->ssid_len,
+ WLAN_CAPABILITY_IBSS | WLAN_CAPABILITY_PRIVACY,
+ capability);
+
+ if (cbss) {
+ struct ieee80211_bss *bss;
+
+ bss = (void *)cbss->priv;
+#ifdef CONFIG_MAC80211_IBSS_DEBUG
+ printk(KERN_DEBUG " sta_find_ibss: selected %pM current "
+ "%pM\n", cbss->bssid, ifibss->bssid);
+#endif /* CONFIG_MAC80211_IBSS_DEBUG */
+
+ printk(KERN_DEBUG "%s: Selected IBSS BSSID %pM"
+ " based on configured SSID\n",
+ sdata->name, cbss->bssid);
+
+ ieee80211_sta_join_ibss(sdata, bss);
+ ieee80211_rx_bss_put(local, bss);
+ return;
+ }
+
+#ifdef CONFIG_MAC80211_IBSS_DEBUG
+ printk(KERN_DEBUG " did not try to join ibss\n");
+#endif /* CONFIG_MAC80211_IBSS_DEBUG */
+
+ /* Selected IBSS not found in current scan results - try to scan */
+ if (time_after(jiffies, ifibss->last_scan_completed +
+ IEEE80211_SCAN_INTERVAL)) {
+ printk(KERN_DEBUG "%s: Trigger new scan to find an IBSS to "
+ "join\n", sdata->name);
+
+ ieee80211_request_ibss_scan(sdata, ifibss->ssid,
+ ifibss->ssid_len, chan);
+ } else {
+ int interval = IEEE80211_SCAN_INTERVAL;
+
+ if (time_after(jiffies, ifibss->ibss_join_req +
+ IEEE80211_IBSS_JOIN_TIMEOUT)) {
+ if (!(local->oper_channel->flags & IEEE80211_CHAN_NO_IBSS)) {
+ ieee80211_sta_create_ibss(sdata);
+ return;
+ }
+ printk(KERN_DEBUG "%s: IBSS not allowed on"
+ " %d MHz\n", sdata->name,
+ local->hw.conf.channel->center_freq);
+
+ /* No IBSS found - decrease scan interval and continue
+ * scanning. */
+ interval = IEEE80211_SCAN_INTERVAL_SLOW;
+ }
+
+ mod_timer(&ifibss->timer,
+ round_jiffies(jiffies + interval));
+ }
+}
+
+static void ieee80211_rx_mgmt_probe_req(struct ieee80211_sub_if_data *sdata,
+ struct sk_buff *req)
+{
+ struct ieee80211_mgmt *mgmt = (void *)req->data;
+ struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
+ struct ieee80211_local *local = sdata->local;
+ int tx_last_beacon, len = req->len;
+ struct sk_buff *skb;
+ struct ieee80211_mgmt *resp;
+ struct sk_buff *presp;
+ u8 *pos, *end;
+
+ lockdep_assert_held(&ifibss->mtx);
+
+ presp = rcu_dereference_protected(ifibss->presp,
+ lockdep_is_held(&ifibss->mtx));
+
+ if (ifibss->state != IEEE80211_IBSS_MLME_JOINED ||
+ len < 24 + 2 || !presp)
+ return;
+
+ tx_last_beacon = drv_tx_last_beacon(local);
+
+#ifdef CONFIG_MAC80211_IBSS_DEBUG
+ printk(KERN_DEBUG "%s: RX ProbeReq SA=%pM DA=%pM BSSID=%pM"
+ " (tx_last_beacon=%d)\n",
+ sdata->name, mgmt->sa, mgmt->da,
+ mgmt->bssid, tx_last_beacon);
+#endif /* CONFIG_MAC80211_IBSS_DEBUG */
+
+ if (!tx_last_beacon && is_multicast_ether_addr(mgmt->da))
+ return;
+
+ if (compare_ether_addr(mgmt->bssid, ifibss->bssid) != 0 &&
+ !is_broadcast_ether_addr(mgmt->bssid))
+ return;
+
+ end = ((u8 *) mgmt) + len;
+ pos = mgmt->u.probe_req.variable;
+ if (pos[0] != WLAN_EID_SSID ||
+ pos + 2 + pos[1] > end) {
+#ifdef CONFIG_MAC80211_IBSS_DEBUG
+ printk(KERN_DEBUG "%s: Invalid SSID IE in ProbeReq "
+ "from %pM\n",
+ sdata->name, mgmt->sa);
+#endif
+ return;
+ }
+ if (pos[1] != 0 &&
+ (pos[1] != ifibss->ssid_len ||
+ memcmp(pos + 2, ifibss->ssid, ifibss->ssid_len))) {
+ /* Ignore ProbeReq for foreign SSID */
+ return;
+ }
+
+ /* Reply with ProbeResp */
+ skb = skb_copy(presp, GFP_KERNEL);
+ if (!skb)
+ return;
+
+ resp = (struct ieee80211_mgmt *) skb->data;
+ memcpy(resp->da, mgmt->sa, ETH_ALEN);
+#ifdef CONFIG_MAC80211_IBSS_DEBUG
+ printk(KERN_DEBUG "%s: Sending ProbeResp to %pM\n",
+ sdata->name, resp->da);
+#endif /* CONFIG_MAC80211_IBSS_DEBUG */
+ IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
+ ieee80211_tx_skb(sdata, skb);
+}
+
+static void ieee80211_rx_mgmt_probe_resp(struct ieee80211_sub_if_data *sdata,
+ struct ieee80211_mgmt *mgmt,
+ size_t len,
+ struct ieee80211_rx_status *rx_status)
+{
+ size_t baselen;
+ struct ieee802_11_elems elems;
+
+ baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt;
+ if (baselen > len)
+ return;
+
+ ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen,
+ &elems);
+
+ ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems, false);
+}
+
+static void ieee80211_rx_mgmt_beacon(struct ieee80211_sub_if_data *sdata,
+ struct ieee80211_mgmt *mgmt,
+ size_t len,
+ struct ieee80211_rx_status *rx_status)
+{
+ size_t baselen;
+ struct ieee802_11_elems elems;
+
+ /* Process beacon from the current BSS */
+ baselen = (u8 *) mgmt->u.beacon.variable - (u8 *) mgmt;
+ if (baselen > len)
+ return;
+
+ ieee802_11_parse_elems(mgmt->u.beacon.variable, len - baselen, &elems);
+
+ ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems, true);
+}
+
+void ieee80211_ibss_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata,
+ struct sk_buff *skb)
+{
+ struct ieee80211_rx_status *rx_status;
+ struct ieee80211_mgmt *mgmt;
+ u16 fc;
+
+ rx_status = IEEE80211_SKB_RXCB(skb);
+ mgmt = (struct ieee80211_mgmt *) skb->data;
+ fc = le16_to_cpu(mgmt->frame_control);
+
+ mutex_lock(&sdata->u.ibss.mtx);
+
+ if (!sdata->u.ibss.ssid_len)
+ goto mgmt_out; /* not ready to merge yet */
+
+ switch (fc & IEEE80211_FCTL_STYPE) {
+ case IEEE80211_STYPE_PROBE_REQ:
+ ieee80211_rx_mgmt_probe_req(sdata, skb);
+ break;
+ case IEEE80211_STYPE_PROBE_RESP:
+ ieee80211_rx_mgmt_probe_resp(sdata, mgmt, skb->len,
+ rx_status);
+ break;
+ case IEEE80211_STYPE_BEACON:
+ ieee80211_rx_mgmt_beacon(sdata, mgmt, skb->len,
+ rx_status);
+ break;
+ case IEEE80211_STYPE_AUTH:
+ ieee80211_rx_mgmt_auth_ibss(sdata, mgmt, skb->len);
+ break;
+ }
+
+ mgmt_out:
+ mutex_unlock(&sdata->u.ibss.mtx);
+}
+
+void ieee80211_ibss_work(struct ieee80211_sub_if_data *sdata)
+{
+ struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
+ struct sta_info *sta;
+
+ mutex_lock(&ifibss->mtx);
+
+ /*
+ * Work could be scheduled after scan or similar
+ * when we aren't even joined (or trying) with a
+ * network.
+ */
+ if (!ifibss->ssid_len)
+ goto out;
+
+ spin_lock_bh(&ifibss->incomplete_lock);
+ while (!list_empty(&ifibss->incomplete_stations)) {
+ sta = list_first_entry(&ifibss->incomplete_stations,
+ struct sta_info, list);
+ list_del(&sta->list);
+ spin_unlock_bh(&ifibss->incomplete_lock);
+
+ ieee80211_ibss_finish_sta(sta, true);
+ rcu_read_unlock();
+ spin_lock_bh(&ifibss->incomplete_lock);
+ }
+ spin_unlock_bh(&ifibss->incomplete_lock);
+
+ switch (ifibss->state) {
+ case IEEE80211_IBSS_MLME_SEARCH:
+ ieee80211_sta_find_ibss(sdata);
+ break;
+ case IEEE80211_IBSS_MLME_JOINED:
+ ieee80211_sta_merge_ibss(sdata);
+ break;
+ default:
+ WARN_ON(1);
+ break;
+ }
+
+ out:
+ mutex_unlock(&ifibss->mtx);
+}
+
+static void ieee80211_ibss_timer(unsigned long data)
+{
+ struct ieee80211_sub_if_data *sdata =
+ (struct ieee80211_sub_if_data *) data;
+ struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
+ struct ieee80211_local *local = sdata->local;
+
+ if (local->quiescing) {
+ ifibss->timer_running = true;
+ return;
+ }
+
+ ieee80211_queue_work(&local->hw, &sdata->work);
+}
+
+#ifdef CONFIG_PM
+void ieee80211_ibss_quiesce(struct ieee80211_sub_if_data *sdata)
+{
+ struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
+
+ if (del_timer_sync(&ifibss->timer))
+ ifibss->timer_running = true;
+}
+
+void ieee80211_ibss_restart(struct ieee80211_sub_if_data *sdata)
+{
+ struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
+
+ if (ifibss->timer_running) {
+ add_timer(&ifibss->timer);
+ ifibss->timer_running = false;
+ }
+}
+#endif
+
+void ieee80211_ibss_setup_sdata(struct ieee80211_sub_if_data *sdata)
+{
+ struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
+
+ setup_timer(&ifibss->timer, ieee80211_ibss_timer,
+ (unsigned long) sdata);
+ mutex_init(&ifibss->mtx);
+ INIT_LIST_HEAD(&ifibss->incomplete_stations);
+ spin_lock_init(&ifibss->incomplete_lock);
+}
+
+/* scan finished notification */
+void ieee80211_ibss_notify_scan_completed(struct ieee80211_local *local)
+{
+ struct ieee80211_sub_if_data *sdata;
+
+ mutex_lock(&local->iflist_mtx);
+ list_for_each_entry(sdata, &local->interfaces, list) {
+ if (!ieee80211_sdata_running(sdata))
+ continue;
+ if (sdata->vif.type != NL80211_IFTYPE_ADHOC)
+ continue;
+ sdata->u.ibss.last_scan_completed = jiffies;
+ ieee80211_queue_work(&local->hw, &sdata->work);
+ }
+ mutex_unlock(&local->iflist_mtx);
+}
+
+int ieee80211_ibss_join(struct ieee80211_sub_if_data *sdata,
+ struct cfg80211_ibss_params *params)
+{
+ struct sk_buff *skb;
+ u32 changed = 0;
+
+ skb = dev_alloc_skb(sdata->local->hw.extra_tx_headroom +
+ sizeof(struct ieee80211_hdr_3addr) +
+ 12 /* struct ieee80211_mgmt.u.beacon */ +
+ 2 + IEEE80211_MAX_SSID_LEN /* max SSID */ +
+ 2 + 8 /* max Supported Rates */ +
+ 3 /* max DS params */ +
+ 4 /* IBSS params */ +
+ 2 + (IEEE80211_MAX_SUPP_RATES - 8) +
+ 2 + sizeof(struct ieee80211_ht_cap) +
+ 2 + sizeof(struct ieee80211_ht_info) +
+ params->ie_len);
+ if (!skb)
+ return -ENOMEM;
+
+ mutex_lock(&sdata->u.ibss.mtx);
+
+ if (params->bssid) {
+ memcpy(sdata->u.ibss.bssid, params->bssid, ETH_ALEN);
+ sdata->u.ibss.fixed_bssid = true;
+ } else
+ sdata->u.ibss.fixed_bssid = false;
+
+ sdata->u.ibss.privacy = params->privacy;
+ sdata->u.ibss.control_port = params->control_port;
+ sdata->u.ibss.basic_rates = params->basic_rates;
+ memcpy(sdata->vif.bss_conf.mcast_rate, params->mcast_rate,
+ sizeof(params->mcast_rate));
+
+ sdata->vif.bss_conf.beacon_int = params->beacon_interval;
+
+ sdata->u.ibss.channel = params->channel;
+ sdata->u.ibss.channel_type = params->channel_type;
+ sdata->u.ibss.fixed_channel = params->channel_fixed;
+
+ /* fix ourselves to that channel now already */
+ if (params->channel_fixed) {
+ sdata->local->oper_channel = params->channel;
+ if (!ieee80211_set_channel_type(sdata->local, sdata,
+ params->channel_type)) {
+ mutex_unlock(&sdata->u.ibss.mtx);
+ kfree_skb(skb);
+ return -EINVAL;
+ }
+ }
+
+ if (params->ie) {
+ sdata->u.ibss.ie = kmemdup(params->ie, params->ie_len,
+ GFP_KERNEL);
+ if (sdata->u.ibss.ie)
+ sdata->u.ibss.ie_len = params->ie_len;
+ }
+
+ sdata->u.ibss.skb = skb;
+ sdata->u.ibss.state = IEEE80211_IBSS_MLME_SEARCH;
+ sdata->u.ibss.ibss_join_req = jiffies;
+
+ memcpy(sdata->u.ibss.ssid, params->ssid, params->ssid_len);
+ sdata->u.ibss.ssid_len = params->ssid_len;
+
+ mutex_unlock(&sdata->u.ibss.mtx);
+
+ mutex_lock(&sdata->local->mtx);
+ ieee80211_recalc_idle(sdata->local);
+ mutex_unlock(&sdata->local->mtx);
+
+ /*
+ * 802.11n-2009 9.13.3.1: In an IBSS, the HT Protection field is
+ * reserved, but an HT STA shall protect HT transmissions as though
+ * the HT Protection field were set to non-HT mixed mode.
+ *
+ * In an IBSS, the RIFS Mode field of the HT Operation element is
+ * also reserved, but an HT STA shall operate as though this field
+ * were set to 1.
+ */
+
+ sdata->vif.bss_conf.ht_operation_mode |=
+ IEEE80211_HT_OP_MODE_PROTECTION_NONHT_MIXED
+ | IEEE80211_HT_PARAM_RIFS_MODE;
+
+ changed |= BSS_CHANGED_HT;
+ ieee80211_bss_info_change_notify(sdata, changed);
+
+ ieee80211_queue_work(&sdata->local->hw, &sdata->work);
+
+ return 0;
+}
+
+int ieee80211_ibss_leave(struct ieee80211_sub_if_data *sdata)
+{
+ struct sk_buff *skb;
+ struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
+ struct ieee80211_local *local = sdata->local;
+ struct cfg80211_bss *cbss;
+ u16 capability;
+ int active_ibss;
+ struct sta_info *sta;
+
+ mutex_lock(&sdata->u.ibss.mtx);
+
+ active_ibss = ieee80211_sta_active_ibss(sdata);
+
+ if (!active_ibss && !is_zero_ether_addr(ifibss->bssid)) {
+ capability = WLAN_CAPABILITY_IBSS;
+
+ if (ifibss->privacy)
+ capability |= WLAN_CAPABILITY_PRIVACY;
+
+ cbss = cfg80211_get_bss(local->hw.wiphy, ifibss->channel,
+ ifibss->bssid, ifibss->ssid,
+ ifibss->ssid_len, WLAN_CAPABILITY_IBSS |
+ WLAN_CAPABILITY_PRIVACY,
+ capability);
+
+ if (cbss) {
+ cfg80211_unlink_bss(local->hw.wiphy, cbss);
+ cfg80211_put_bss(cbss);
+ }
+ }
+
+ ifibss->state = IEEE80211_IBSS_MLME_SEARCH;
+ memset(ifibss->bssid, 0, ETH_ALEN);
+ ifibss->ssid_len = 0;
+
+ sta_info_flush(sdata->local, sdata);
+
+ spin_lock_bh(&ifibss->incomplete_lock);
+ while (!list_empty(&ifibss->incomplete_stations)) {
+ sta = list_first_entry(&ifibss->incomplete_stations,
+ struct sta_info, list);
+ list_del(&sta->list);
+ spin_unlock_bh(&ifibss->incomplete_lock);
+
+ sta_info_free(local, sta);
+ spin_lock_bh(&ifibss->incomplete_lock);
+ }
+ spin_unlock_bh(&ifibss->incomplete_lock);
+
+ netif_carrier_off(sdata->dev);
+
+ /* remove beacon */
+ kfree(sdata->u.ibss.ie);
+ skb = rcu_dereference_protected(sdata->u.ibss.presp,
+ lockdep_is_held(&sdata->u.ibss.mtx));
+ RCU_INIT_POINTER(sdata->u.ibss.presp, NULL);
+ sdata->vif.bss_conf.ibss_joined = false;
+ ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BEACON_ENABLED |
+ BSS_CHANGED_IBSS);
+ synchronize_rcu();
+ kfree_skb(skb);
+
+ skb_queue_purge(&sdata->skb_queue);
+
+ del_timer_sync(&sdata->u.ibss.timer);
+
+ mutex_unlock(&sdata->u.ibss.mtx);
+
+ mutex_lock(&local->mtx);
+ ieee80211_recalc_idle(sdata->local);
+ mutex_unlock(&local->mtx);
+
+ return 0;
+}