--- /dev/null
+/*
+ * 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>
+ * Copyright 2013-2014 Intel Mobile Communications GmbH
+ *
+ * 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_IBSS_JOIN_TIMEOUT (7 * HZ)
+
+#define IEEE80211_IBSS_MERGE_INTERVAL (30 * HZ)
+#define IEEE80211_IBSS_INACTIVITY_LIMIT (60 * HZ)
+#define IEEE80211_IBSS_RSN_INACTIVITY_LIMIT (10 * HZ)
+
+#define IEEE80211_IBSS_MAX_STA_ENTRIES 128
+
+static struct beacon_data *
+ieee80211_ibss_build_presp(struct ieee80211_sub_if_data *sdata,
+ const int beacon_int, const u32 basic_rates,
+ const u16 capability, u64 tsf,
+ struct cfg80211_chan_def *chandef,
+ bool *have_higher_than_11mbit,
+ struct cfg80211_csa_settings *csa_settings)
+{
+ struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
+ struct ieee80211_local *local = sdata->local;
+ int rates_n = 0, i, ri;
+ struct ieee80211_mgmt *mgmt;
+ u8 *pos;
+ struct ieee80211_supported_band *sband;
+ u32 rate_flags, rates = 0, rates_added = 0;
+ struct beacon_data *presp;
+ int frame_len;
+ int shift;
+
+ /* Build IBSS probe response */
+ frame_len = 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 */ +
+ 5 /* Channel Switch Announcement */ +
+ 2 + (IEEE80211_MAX_SUPP_RATES - 8) +
+ 2 + sizeof(struct ieee80211_ht_cap) +
+ 2 + sizeof(struct ieee80211_ht_operation) +
+ ifibss->ie_len;
+ presp = kzalloc(sizeof(*presp) + frame_len, GFP_KERNEL);
+ if (!presp)
+ return NULL;
+
+ presp->head = (void *)(presp + 1);
+
+ mgmt = (void *) presp->head;
+ mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
+ IEEE80211_STYPE_PROBE_RESP);
+ eth_broadcast_addr(mgmt->da);
+ 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 = (u8 *)mgmt + offsetof(struct ieee80211_mgmt, u.beacon.variable);
+
+ *pos++ = WLAN_EID_SSID;
+ *pos++ = ifibss->ssid_len;
+ memcpy(pos, ifibss->ssid, ifibss->ssid_len);
+ pos += ifibss->ssid_len;
+
+ sband = local->hw.wiphy->bands[chandef->chan->band];
+ rate_flags = ieee80211_chandef_rate_flags(chandef);
+ shift = ieee80211_chandef_get_shift(chandef);
+ rates_n = 0;
+ if (have_higher_than_11mbit)
+ *have_higher_than_11mbit = false;
+
+ for (i = 0; i < sband->n_bitrates; i++) {
+ if ((rate_flags & sband->bitrates[i].flags) != rate_flags)
+ continue;
+ if (sband->bitrates[i].bitrate > 110 &&
+ have_higher_than_11mbit)
+ *have_higher_than_11mbit = true;
+
+ rates |= BIT(i);
+ rates_n++;
+ }
+
+ *pos++ = WLAN_EID_SUPP_RATES;
+ *pos++ = min_t(int, 8, rates_n);
+ for (ri = 0; ri < sband->n_bitrates; ri++) {
+ int rate = DIV_ROUND_UP(sband->bitrates[ri].bitrate,
+ 5 * (1 << shift));
+ u8 basic = 0;
+ if (!(rates & BIT(ri)))
+ continue;
+
+ if (basic_rates & BIT(ri))
+ basic = 0x80;
+ *pos++ = basic | (u8) rate;
+ if (++rates_added == 8) {
+ ri++; /* continue at next rate for EXT_SUPP_RATES */
+ break;
+ }
+ }
+
+ if (sband->band == IEEE80211_BAND_2GHZ) {
+ *pos++ = WLAN_EID_DS_PARAMS;
+ *pos++ = 1;
+ *pos++ = ieee80211_frequency_to_channel(
+ chandef->chan->center_freq);
+ }
+
+ *pos++ = WLAN_EID_IBSS_PARAMS;
+ *pos++ = 2;
+ /* FIX: set ATIM window based on scan results */
+ *pos++ = 0;
+ *pos++ = 0;
+
+ if (csa_settings) {
+ *pos++ = WLAN_EID_CHANNEL_SWITCH;
+ *pos++ = 3;
+ *pos++ = csa_settings->block_tx ? 1 : 0;
+ *pos++ = ieee80211_frequency_to_channel(
+ csa_settings->chandef.chan->center_freq);
+ presp->csa_counter_offsets[0] = (pos - presp->head);
+ *pos++ = csa_settings->count;
+ }
+
+ /* put the remaining rates in WLAN_EID_EXT_SUPP_RATES */
+ if (rates_n > 8) {
+ *pos++ = WLAN_EID_EXT_SUPP_RATES;
+ *pos++ = rates_n - 8;
+ for (; ri < sband->n_bitrates; ri++) {
+ int rate = DIV_ROUND_UP(sband->bitrates[ri].bitrate,
+ 5 * (1 << shift));
+ u8 basic = 0;
+ if (!(rates & BIT(ri)))
+ continue;
+
+ if (basic_rates & BIT(ri))
+ basic = 0x80;
+ *pos++ = basic | (u8) rate;
+ }
+ }
+
+ if (ifibss->ie_len) {
+ memcpy(pos, ifibss->ie, ifibss->ie_len);
+ pos += ifibss->ie_len;
+ }
+
+ /* add HT capability and information IEs */
+ if (chandef->width != NL80211_CHAN_WIDTH_20_NOHT &&
+ chandef->width != NL80211_CHAN_WIDTH_5 &&
+ chandef->width != NL80211_CHAN_WIDTH_10 &&
+ sband->ht_cap.ht_supported) {
+ struct ieee80211_sta_ht_cap ht_cap;
+
+ memcpy(&ht_cap, &sband->ht_cap, sizeof(ht_cap));
+ ieee80211_apply_htcap_overrides(sdata, &ht_cap);
+
+ pos = ieee80211_ie_build_ht_cap(pos, &ht_cap, ht_cap.cap);
+ /*
+ * Note: According to 802.11n-2009 9.13.3.1, HT Protection
+ * field and RIFS Mode are reserved in IBSS mode, therefore
+ * keep them at 0
+ */
+ pos = ieee80211_ie_build_ht_oper(pos, &sband->ht_cap,
+ chandef, 0);
+
+ /* add VHT capability and information IEs */
+ if (chandef->width != NL80211_CHAN_WIDTH_20 &&
+ chandef->width != NL80211_CHAN_WIDTH_40 &&
+ sband->vht_cap.vht_supported) {
+ pos = ieee80211_ie_build_vht_cap(pos, &sband->vht_cap,
+ sband->vht_cap.cap);
+ pos = ieee80211_ie_build_vht_oper(pos, &sband->vht_cap,
+ chandef);
+ }
+ }
+
+ if (local->hw.queues >= IEEE80211_NUM_ACS)
+ pos = ieee80211_add_wmm_info_ie(pos, 0); /* U-APSD not in use */
+
+ presp->head_len = pos - presp->head;
+ if (WARN_ON(presp->head_len > frame_len))
+ goto error;
+
+ return presp;
+error:
+ kfree(presp);
+ return NULL;
+}
+
+static void __ieee80211_sta_join_ibss(struct ieee80211_sub_if_data *sdata,
+ const u8 *bssid, const int beacon_int,
+ struct cfg80211_chan_def *req_chandef,
+ const u32 basic_rates,
+ const u16 capability, u64 tsf,
+ bool creator)
+{
+ struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
+ struct ieee80211_local *local = sdata->local;
+ struct ieee80211_mgmt *mgmt;
+ struct cfg80211_bss *bss;
+ u32 bss_change;
+ struct cfg80211_chan_def chandef;
+ struct ieee80211_channel *chan;
+ struct beacon_data *presp;
+ enum nl80211_bss_scan_width scan_width;
+ bool have_higher_than_11mbit;
+ bool radar_required;
+ int err;
+
+ sdata_assert_lock(sdata);
+
+ /* Reset own TSF to allow time synchronization work. */
+ drv_reset_tsf(local, sdata);
+
+ if (!ether_addr_equal(ifibss->bssid, bssid))
+ sta_info_flush(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;
+ sdata->vif.bss_conf.ibss_creator = false;
+ sdata->vif.bss_conf.enable_beacon = false;
+ netif_carrier_off(sdata->dev);
+ ieee80211_bss_info_change_notify(sdata,
+ BSS_CHANGED_IBSS |
+ BSS_CHANGED_BEACON_ENABLED);
+ drv_leave_ibss(local, sdata);
+ }
+
+ presp = rcu_dereference_protected(ifibss->presp,
+ lockdep_is_held(&sdata->wdev.mtx));
+ RCU_INIT_POINTER(ifibss->presp, NULL);
+ if (presp)
+ kfree_rcu(presp, rcu_head);
+
+ /* make a copy of the chandef, it could be modified below. */
+ chandef = *req_chandef;
+ chan = chandef.chan;
+ if (!cfg80211_reg_can_beacon(local->hw.wiphy, &chandef,
+ NL80211_IFTYPE_ADHOC)) {
+ if (chandef.width == NL80211_CHAN_WIDTH_5 ||
+ chandef.width == NL80211_CHAN_WIDTH_10 ||
+ chandef.width == NL80211_CHAN_WIDTH_20_NOHT ||
+ chandef.width == NL80211_CHAN_WIDTH_20) {
+ sdata_info(sdata,
+ "Failed to join IBSS, beacons forbidden\n");
+ return;
+ }
+ chandef.width = NL80211_CHAN_WIDTH_20;
+ chandef.center_freq1 = chan->center_freq;
+ /* check again for downgraded chandef */
+ if (!cfg80211_reg_can_beacon(local->hw.wiphy, &chandef,
+ NL80211_IFTYPE_ADHOC)) {
+ sdata_info(sdata,
+ "Failed to join IBSS, beacons forbidden\n");
+ return;
+ }
+ }
+
+ err = cfg80211_chandef_dfs_required(sdata->local->hw.wiphy,
+ &chandef, NL80211_IFTYPE_ADHOC);
+ if (err < 0) {
+ sdata_info(sdata,
+ "Failed to join IBSS, invalid chandef\n");
+ return;
+ }
+ if (err > 0 && !ifibss->userspace_handles_dfs) {
+ sdata_info(sdata,
+ "Failed to join IBSS, DFS channel without control program\n");
+ return;
+ }
+
+ radar_required = err;
+
+ mutex_lock(&local->mtx);
+ if (ieee80211_vif_use_channel(sdata, &chandef,
+ ifibss->fixed_channel ?
+ IEEE80211_CHANCTX_SHARED :
+ IEEE80211_CHANCTX_EXCLUSIVE)) {
+ sdata_info(sdata, "Failed to join IBSS, no channel context\n");
+ mutex_unlock(&local->mtx);
+ return;
+ }
+ sdata->radar_required = radar_required;
+ mutex_unlock(&local->mtx);
+
+ memcpy(ifibss->bssid, bssid, ETH_ALEN);
+
+ presp = ieee80211_ibss_build_presp(sdata, beacon_int, basic_rates,
+ capability, tsf, &chandef,
+ &have_higher_than_11mbit, NULL);
+ if (!presp)
+ return;
+
+ rcu_assign_pointer(ifibss->presp, presp);
+ mgmt = (void *)presp->head;
+
+ sdata->vif.bss_conf.enable_beacon = true;
+ sdata->vif.bss_conf.beacon_int = beacon_int;
+ sdata->vif.bss_conf.basic_rates = basic_rates;
+ sdata->vif.bss_conf.ssid_len = ifibss->ssid_len;
+ memcpy(sdata->vif.bss_conf.ssid, ifibss->ssid, ifibss->ssid_len);
+ 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;
+ bss_change |= BSS_CHANGED_SSID;
+
+ /*
+ * In 5 GHz/802.11a, we can always use short slot time.
+ * (IEEE 802.11-2012 18.3.8.7)
+ *
+ * In 2.4GHz, we must always use long slots in IBSS for compatibility
+ * reasons.
+ * (IEEE 802.11-2012 19.4.5)
+ *
+ * HT follows these specifications (IEEE 802.11-2012 20.3.18)
+ */
+ sdata->vif.bss_conf.use_short_slot = chan->band == IEEE80211_BAND_5GHZ;
+ bss_change |= BSS_CHANGED_ERP_SLOT;
+
+ /* cf. IEEE 802.11 9.2.12 */
+ if (chan->band == IEEE80211_BAND_2GHZ && have_higher_than_11mbit)
+ sdata->flags |= IEEE80211_SDATA_OPERATING_GMODE;
+ else
+ sdata->flags &= ~IEEE80211_SDATA_OPERATING_GMODE;
+
+ ieee80211_set_wmm_default(sdata, true);
+
+ sdata->vif.bss_conf.ibss_joined = true;
+ sdata->vif.bss_conf.ibss_creator = creator;
+
+ err = drv_join_ibss(local, sdata);
+ if (err) {
+ sdata->vif.bss_conf.ibss_joined = false;
+ sdata->vif.bss_conf.ibss_creator = false;
+ sdata->vif.bss_conf.enable_beacon = false;
+ sdata->vif.bss_conf.ssid_len = 0;
+ RCU_INIT_POINTER(ifibss->presp, NULL);
+ kfree_rcu(presp, rcu_head);
+ mutex_lock(&local->mtx);
+ ieee80211_vif_release_channel(sdata);
+ mutex_unlock(&local->mtx);
+ sdata_info(sdata, "Failed to join IBSS, driver failure: %d\n",
+ err);
+ return;
+ }
+
+ ieee80211_bss_info_change_notify(sdata, bss_change);
+
+ ifibss->state = IEEE80211_IBSS_MLME_JOINED;
+ mod_timer(&ifibss->timer,
+ round_jiffies(jiffies + IEEE80211_IBSS_MERGE_INTERVAL));
+
+ scan_width = cfg80211_chandef_to_scan_width(&chandef);
+ bss = cfg80211_inform_bss_width_frame(local->hw.wiphy, chan,
+ scan_width, mgmt,
+ presp->head_len, 0, GFP_KERNEL);
+ cfg80211_put_bss(local->hw.wiphy, bss);
+ netif_carrier_on(sdata->dev);
+ cfg80211_ibss_joined(sdata->dev, ifibss->bssid, chan, 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;
+ struct cfg80211_chan_def chandef;
+ u32 basic_rates;
+ int i, j;
+ u16 beacon_int = cbss->beacon_interval;
+ const struct cfg80211_bss_ies *ies;
+ enum nl80211_channel_type chan_type;
+ u64 tsf;
+ u32 rate_flags;
+ int shift;
+
+ sdata_assert_lock(sdata);
+
+ if (beacon_int < 10)
+ beacon_int = 10;
+
+ switch (sdata->u.ibss.chandef.width) {
+ case NL80211_CHAN_WIDTH_20_NOHT:
+ case NL80211_CHAN_WIDTH_20:
+ case NL80211_CHAN_WIDTH_40:
+ chan_type = cfg80211_get_chandef_type(&sdata->u.ibss.chandef);
+ cfg80211_chandef_create(&chandef, cbss->channel, chan_type);
+ break;
+ case NL80211_CHAN_WIDTH_5:
+ case NL80211_CHAN_WIDTH_10:
+ cfg80211_chandef_create(&chandef, cbss->channel,
+ NL80211_CHAN_WIDTH_20_NOHT);
+ chandef.width = sdata->u.ibss.chandef.width;
+ break;
+ case NL80211_CHAN_WIDTH_80:
+ case NL80211_CHAN_WIDTH_160:
+ chandef = sdata->u.ibss.chandef;
+ chandef.chan = cbss->channel;
+ break;
+ default:
+ /* fall back to 20 MHz for unsupported modes */
+ cfg80211_chandef_create(&chandef, cbss->channel,
+ NL80211_CHAN_WIDTH_20_NOHT);
+ break;
+ }
+
+ sband = sdata->local->hw.wiphy->bands[cbss->channel->band];
+ rate_flags = ieee80211_chandef_rate_flags(&sdata->u.ibss.chandef);
+ shift = ieee80211_vif_get_shift(&sdata->vif);
+
+ basic_rates = 0;
+
+ for (i = 0; i < bss->supp_rates_len; i++) {
+ int rate = bss->supp_rates[i] & 0x7f;
+ bool is_basic = !!(bss->supp_rates[i] & 0x80);
+
+ for (j = 0; j < sband->n_bitrates; j++) {
+ int brate;
+ if ((rate_flags & sband->bitrates[j].flags)
+ != rate_flags)
+ continue;
+
+ brate = DIV_ROUND_UP(sband->bitrates[j].bitrate,
+ 5 * (1 << shift));
+ if (brate == rate) {
+ if (is_basic)
+ basic_rates |= BIT(j);
+ break;
+ }
+ }
+ }
+
+ rcu_read_lock();
+ ies = rcu_dereference(cbss->ies);
+ tsf = ies->tsf;
+ rcu_read_unlock();
+
+ __ieee80211_sta_join_ibss(sdata, cbss->bssid,
+ beacon_int,
+ &chandef,
+ basic_rates,
+ cbss->capability,
+ tsf, false);
+}
+
+int ieee80211_ibss_csa_beacon(struct ieee80211_sub_if_data *sdata,
+ struct cfg80211_csa_settings *csa_settings)
+{
+ struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
+ struct beacon_data *presp, *old_presp;
+ struct cfg80211_bss *cbss;
+ const struct cfg80211_bss_ies *ies;
+ u16 capability = 0;
+ u64 tsf;
+ int ret = 0;
+
+ sdata_assert_lock(sdata);
+
+ if (ifibss->privacy)
+ capability = WLAN_CAPABILITY_PRIVACY;
+
+ cbss = cfg80211_get_bss(sdata->local->hw.wiphy, ifibss->chandef.chan,
+ ifibss->bssid, ifibss->ssid,
+ ifibss->ssid_len, IEEE80211_BSS_TYPE_IBSS,
+ IEEE80211_PRIVACY(ifibss->privacy));
+
+ if (WARN_ON(!cbss)) {
+ ret = -EINVAL;
+ goto out;
+ }
+
+ rcu_read_lock();
+ ies = rcu_dereference(cbss->ies);
+ tsf = ies->tsf;
+ rcu_read_unlock();
+ cfg80211_put_bss(sdata->local->hw.wiphy, cbss);
+
+ old_presp = rcu_dereference_protected(ifibss->presp,
+ lockdep_is_held(&sdata->wdev.mtx));
+
+ presp = ieee80211_ibss_build_presp(sdata,
+ sdata->vif.bss_conf.beacon_int,
+ sdata->vif.bss_conf.basic_rates,
+ capability, tsf, &ifibss->chandef,
+ NULL, csa_settings);
+ if (!presp) {
+ ret = -ENOMEM;
+ goto out;
+ }
+
+ rcu_assign_pointer(ifibss->presp, presp);
+ if (old_presp)
+ kfree_rcu(old_presp, rcu_head);
+
+ return BSS_CHANGED_BEACON;
+ out:
+ return ret;
+}
+
+int ieee80211_ibss_finish_csa(struct ieee80211_sub_if_data *sdata)
+{
+ struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
+ struct cfg80211_bss *cbss;
+ int err, changed = 0;
+
+ sdata_assert_lock(sdata);
+
+ /* update cfg80211 bss information with the new channel */
+ if (!is_zero_ether_addr(ifibss->bssid)) {
+ cbss = cfg80211_get_bss(sdata->local->hw.wiphy,
+ ifibss->chandef.chan,
+ ifibss->bssid, ifibss->ssid,
+ ifibss->ssid_len,
+ IEEE80211_BSS_TYPE_IBSS,
+ IEEE80211_PRIVACY(ifibss->privacy));
+ /* XXX: should not really modify cfg80211 data */
+ if (cbss) {
+ cbss->channel = sdata->csa_chandef.chan;
+ cfg80211_put_bss(sdata->local->hw.wiphy, cbss);
+ }
+ }
+
+ ifibss->chandef = sdata->csa_chandef;
+
+ /* generate the beacon */
+ err = ieee80211_ibss_csa_beacon(sdata, NULL);
+ if (err < 0)
+ return err;
+
+ changed |= err;
+
+ return changed;
+}
+
+void ieee80211_ibss_stop(struct ieee80211_sub_if_data *sdata)
+{
+ struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
+
+ cancel_work_sync(&ifibss->csa_connection_drop_work);
+}
+
+static struct sta_info *ieee80211_ibss_finish_sta(struct sta_info *sta)
+ __acquires(RCU)
+{
+ struct ieee80211_sub_if_data *sdata = sta->sdata;
+ u8 addr[ETH_ALEN];
+
+ memcpy(addr, sta->sta.addr, ETH_ALEN);
+
+ ibss_dbg(sdata, "Adding new IBSS station %pM\n", addr);
+
+ 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);
+ 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)
+ __acquires(RCU)
+{
+ struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
+ struct ieee80211_local *local = sdata->local;
+ struct sta_info *sta;
+ struct ieee80211_chanctx_conf *chanctx_conf;
+ struct ieee80211_supported_band *sband;
+ enum nl80211_bss_scan_width scan_width;
+ int 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) {
+ net_info_ratelimited("%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 (!ether_addr_equal(bssid, sdata->u.ibss.bssid)) {
+ rcu_read_lock();
+ return NULL;
+ }
+
+ rcu_read_lock();
+ chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
+ if (WARN_ON_ONCE(!chanctx_conf))
+ return NULL;
+ band = chanctx_conf->def.chan->band;
+ scan_width = cfg80211_chandef_to_scan_width(&chanctx_conf->def);
+ rcu_read_unlock();
+
+ 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 */
+ sband = local->hw.wiphy->bands[band];
+ sta->sta.supp_rates[band] = supp_rates |
+ ieee80211_mandatory_rates(sband, scan_width);
+
+ return ieee80211_ibss_finish_sta(sta);
+}
+
+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;
+
+ sdata_assert_lock(sdata);
+
+ 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;
+}
+
+static void ieee80211_ibss_disconnect(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 beacon_data *presp;
+ struct sta_info *sta;
+
+ if (!is_zero_ether_addr(ifibss->bssid)) {
+ cbss = cfg80211_get_bss(local->hw.wiphy, ifibss->chandef.chan,
+ ifibss->bssid, ifibss->ssid,
+ ifibss->ssid_len,
+ IEEE80211_BSS_TYPE_IBSS,
+ IEEE80211_PRIVACY(ifibss->privacy));
+
+ if (cbss) {
+ cfg80211_unlink_bss(local->hw.wiphy, cbss);
+ cfg80211_put_bss(sdata->local->hw.wiphy, cbss);
+ }
+ }
+
+ ifibss->state = IEEE80211_IBSS_MLME_SEARCH;
+
+ sta_info_flush(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);
+
+ sdata->vif.bss_conf.ibss_joined = false;
+ sdata->vif.bss_conf.ibss_creator = false;
+ sdata->vif.bss_conf.enable_beacon = false;
+ sdata->vif.bss_conf.ssid_len = 0;
+
+ /* remove beacon */
+ presp = rcu_dereference_protected(ifibss->presp,
+ lockdep_is_held(&sdata->wdev.mtx));
+ RCU_INIT_POINTER(sdata->u.ibss.presp, NULL);
+ if (presp)
+ kfree_rcu(presp, rcu_head);
+
+ clear_bit(SDATA_STATE_OFFCHANNEL_BEACON_STOPPED, &sdata->state);
+ ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BEACON_ENABLED |
+ BSS_CHANGED_IBSS);
+ drv_leave_ibss(local, sdata);
+ mutex_lock(&local->mtx);
+ ieee80211_vif_release_channel(sdata);
+ mutex_unlock(&local->mtx);
+}
+
+static void ieee80211_csa_connection_drop_work(struct work_struct *work)
+{
+ struct ieee80211_sub_if_data *sdata =
+ container_of(work, struct ieee80211_sub_if_data,
+ u.ibss.csa_connection_drop_work);
+
+ sdata_lock(sdata);
+
+ ieee80211_ibss_disconnect(sdata);
+ synchronize_rcu();
+ skb_queue_purge(&sdata->skb_queue);
+
+ /* trigger a scan to find another IBSS network to join */
+ ieee80211_queue_work(&sdata->local->hw, &sdata->work);
+
+ sdata_unlock(sdata);
+}
+
+static void ieee80211_ibss_csa_mark_radar(struct ieee80211_sub_if_data *sdata)
+{
+ struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
+ int err;
+
+ /* if the current channel is a DFS channel, mark the channel as
+ * unavailable.
+ */
+ err = cfg80211_chandef_dfs_required(sdata->local->hw.wiphy,
+ &ifibss->chandef,
+ NL80211_IFTYPE_ADHOC);
+ if (err > 0)
+ cfg80211_radar_event(sdata->local->hw.wiphy, &ifibss->chandef,
+ GFP_ATOMIC);
+}
+
+static bool
+ieee80211_ibss_process_chanswitch(struct ieee80211_sub_if_data *sdata,
+ struct ieee802_11_elems *elems,
+ bool beacon)
+{
+ struct cfg80211_csa_settings params;
+ struct ieee80211_csa_ie csa_ie;
+ struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
+ enum nl80211_channel_type ch_type;
+ int err;
+ u32 sta_flags;
+
+ sdata_assert_lock(sdata);
+
+ sta_flags = IEEE80211_STA_DISABLE_VHT;
+ switch (ifibss->chandef.width) {
+ case NL80211_CHAN_WIDTH_5:
+ case NL80211_CHAN_WIDTH_10:
+ case NL80211_CHAN_WIDTH_20_NOHT:
+ sta_flags |= IEEE80211_STA_DISABLE_HT;
+ /* fall through */
+ case NL80211_CHAN_WIDTH_20:
+ sta_flags |= IEEE80211_STA_DISABLE_40MHZ;
+ break;
+ default:
+ break;
+ }
+
+ memset(¶ms, 0, sizeof(params));
+ memset(&csa_ie, 0, sizeof(csa_ie));
+ err = ieee80211_parse_ch_switch_ie(sdata, elems,
+ ifibss->chandef.chan->band,
+ sta_flags, ifibss->bssid, &csa_ie);
+ /* can't switch to destination channel, fail */
+ if (err < 0)
+ goto disconnect;
+
+ /* did not contain a CSA */
+ if (err)
+ return false;
+
+ /* channel switch is not supported, disconnect */
+ if (!(sdata->local->hw.wiphy->flags & WIPHY_FLAG_HAS_CHANNEL_SWITCH))
+ goto disconnect;
+
+ params.count = csa_ie.count;
+ params.chandef = csa_ie.chandef;
+
+ switch (ifibss->chandef.width) {
+ case NL80211_CHAN_WIDTH_20_NOHT:
+ case NL80211_CHAN_WIDTH_20:
+ case NL80211_CHAN_WIDTH_40:
+ /* keep our current HT mode (HT20/HT40+/HT40-), even if
+ * another mode has been announced. The mode is not adopted
+ * within the beacon while doing CSA and we should therefore
+ * keep the mode which we announce.
+ */
+ ch_type = cfg80211_get_chandef_type(&ifibss->chandef);
+ cfg80211_chandef_create(¶ms.chandef, params.chandef.chan,
+ ch_type);
+ break;
+ case NL80211_CHAN_WIDTH_5:
+ case NL80211_CHAN_WIDTH_10:
+ if (params.chandef.width != ifibss->chandef.width) {
+ sdata_info(sdata,
+ "IBSS %pM received channel switch from incompatible channel width (%d MHz, width:%d, CF1/2: %d/%d MHz), disconnecting\n",
+ ifibss->bssid,
+ params.chandef.chan->center_freq,
+ params.chandef.width,
+ params.chandef.center_freq1,
+ params.chandef.center_freq2);
+ goto disconnect;
+ }
+ break;
+ default:
+ /* should not happen, sta_flags should prevent VHT modes. */
+ WARN_ON(1);
+ goto disconnect;
+ }
+
+ if (!cfg80211_reg_can_beacon(sdata->local->hw.wiphy, ¶ms.chandef,
+ NL80211_IFTYPE_ADHOC)) {
+ sdata_info(sdata,
+ "IBSS %pM switches to unsupported channel (%d MHz, width:%d, CF1/2: %d/%d MHz), disconnecting\n",
+ ifibss->bssid,
+ params.chandef.chan->center_freq,
+ params.chandef.width,
+ params.chandef.center_freq1,
+ params.chandef.center_freq2);
+ goto disconnect;
+ }
+
+ err = cfg80211_chandef_dfs_required(sdata->local->hw.wiphy,
+ ¶ms.chandef,
+ NL80211_IFTYPE_ADHOC);
+ if (err < 0)
+ goto disconnect;
+ if (err > 0 && !ifibss->userspace_handles_dfs) {
+ /* IBSS-DFS only allowed with a control program */
+ goto disconnect;
+ }
+
+ params.radar_required = err;
+
+ if (cfg80211_chandef_identical(¶ms.chandef,
+ &sdata->vif.bss_conf.chandef)) {
+ ibss_dbg(sdata,
+ "received csa with an identical chandef, ignoring\n");
+ return true;
+ }
+
+ /* all checks done, now perform the channel switch. */
+ ibss_dbg(sdata,
+ "received channel switch announcement to go to channel %d MHz\n",
+ params.chandef.chan->center_freq);
+
+ params.block_tx = !!csa_ie.mode;
+
+ if (ieee80211_channel_switch(sdata->local->hw.wiphy, sdata->dev,
+ ¶ms))
+ goto disconnect;
+
+ ieee80211_ibss_csa_mark_radar(sdata);
+
+ return true;
+disconnect:
+ ibss_dbg(sdata, "Can't handle channel switch, disconnect\n");
+ ieee80211_queue_work(&sdata->local->hw,
+ &ifibss->csa_connection_drop_work);
+
+ ieee80211_ibss_csa_mark_radar(sdata);
+
+ return true;
+}
+
+static void
+ieee80211_rx_mgmt_spectrum_mgmt(struct ieee80211_sub_if_data *sdata,
+ struct ieee80211_mgmt *mgmt, size_t len,
+ struct ieee80211_rx_status *rx_status,
+ struct ieee802_11_elems *elems)
+{
+ int required_len;
+
+ if (len < IEEE80211_MIN_ACTION_SIZE + 1)
+ return;
+
+ /* CSA is the only action we handle for now */
+ if (mgmt->u.action.u.measurement.action_code !=
+ WLAN_ACTION_SPCT_CHL_SWITCH)
+ return;
+
+ required_len = IEEE80211_MIN_ACTION_SIZE +
+ sizeof(mgmt->u.action.u.chan_switch);
+ if (len < required_len)
+ return;
+
+ if (!sdata->vif.csa_active)
+ ieee80211_ibss_process_chanswitch(sdata, elems, false);
+}
+
+static void ieee80211_rx_mgmt_deauth_ibss(struct ieee80211_sub_if_data *sdata,
+ struct ieee80211_mgmt *mgmt,
+ size_t len)
+{
+ u16 reason = le16_to_cpu(mgmt->u.deauth.reason_code);
+
+ if (len < IEEE80211_DEAUTH_FRAME_LEN)
+ return;
+
+ ibss_dbg(sdata, "RX DeAuth SA=%pM DA=%pM BSSID=%pM (reason: %d)\n",
+ mgmt->sa, mgmt->da, mgmt->bssid, reason);
+ sta_info_destroy_addr(sdata, mgmt->sa);
+}
+
+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;
+
+ sdata_assert_lock(sdata);
+
+ 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);
+
+ ibss_dbg(sdata,
+ "RX Auth SA=%pM DA=%pM BSSID=%pM (auth_transaction=%d)\n",
+ mgmt->sa, mgmt->da, mgmt->bssid, auth_transaction);
+
+ if (auth_alg != WLAN_AUTH_OPEN || auth_transaction != 1)
+ return;
+
+ /*
+ * 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, 0, NULL, 0,
+ mgmt->sa, sdata->u.ibss.bssid, NULL, 0, 0, 0);
+}
+
+static void ieee80211_update_sta_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,
+ struct ieee80211_channel *channel)
+{
+ struct sta_info *sta;
+ enum ieee80211_band band = rx_status->band;
+ enum nl80211_bss_scan_width scan_width;
+ struct ieee80211_local *local = sdata->local;
+ struct ieee80211_supported_band *sband = local->hw.wiphy->bands[band];
+ bool rates_updated = false;
+ u32 supp_rates = 0;
+
+ if (sdata->vif.type != NL80211_IFTYPE_ADHOC)
+ return;
+
+ if (!ether_addr_equal(mgmt->bssid, sdata->u.ibss.bssid))
+ return;
+
+ rcu_read_lock();
+ sta = sta_info_get(sdata, mgmt->sa);
+
+ if (elems->supp_rates) {
+ supp_rates = ieee80211_sta_get_rates(sdata, elems,
+ band, NULL);
+ if (sta) {
+ u32 prev_rates;
+
+ prev_rates = sta->sta.supp_rates[band];
+ /* make sure mandatory rates are always added */
+ scan_width = NL80211_BSS_CHAN_WIDTH_20;
+ if (rx_status->flag & RX_FLAG_5MHZ)
+ scan_width = NL80211_BSS_CHAN_WIDTH_5;
+ if (rx_status->flag & RX_FLAG_10MHZ)
+ scan_width = NL80211_BSS_CHAN_WIDTH_10;
+
+ sta->sta.supp_rates[band] = supp_rates |
+ ieee80211_mandatory_rates(sband, scan_width);
+ if (sta->sta.supp_rates[band] != prev_rates) {
+ ibss_dbg(sdata,
+ "updated supp_rates set for %pM based on beacon/probe_resp (0x%x -> 0x%x)\n",
+ sta->sta.addr, prev_rates,
+ sta->sta.supp_rates[band]);
+ rates_updated = true;
+ }
+ } else {
+ rcu_read_unlock();
+ sta = ieee80211_ibss_add_sta(sdata, mgmt->bssid,
+ mgmt->sa, supp_rates);
+ }
+ }
+
+ if (sta && elems->wmm_info && local->hw.queues >= IEEE80211_NUM_ACS)
+ sta->sta.wme = true;
+
+ if (sta && elems->ht_operation && elems->ht_cap_elem &&
+ sdata->u.ibss.chandef.width != NL80211_CHAN_WIDTH_20_NOHT &&
+ sdata->u.ibss.chandef.width != NL80211_CHAN_WIDTH_5 &&
+ sdata->u.ibss.chandef.width != NL80211_CHAN_WIDTH_10) {
+ /* we both use HT */
+ struct ieee80211_ht_cap htcap_ie;
+ struct cfg80211_chan_def chandef;
+ enum ieee80211_sta_rx_bandwidth bw = sta->sta.bandwidth;
+
+ ieee80211_ht_oper_to_chandef(channel,
+ elems->ht_operation,
+ &chandef);
+
+ memcpy(&htcap_ie, elems->ht_cap_elem, sizeof(htcap_ie));
+ rates_updated |= ieee80211_ht_cap_ie_to_sta_ht_cap(sdata, sband,
+ &htcap_ie,
+ sta);
+
+ if (elems->vht_operation && elems->vht_cap_elem &&
+ sdata->u.ibss.chandef.width != NL80211_CHAN_WIDTH_20 &&
+ sdata->u.ibss.chandef.width != NL80211_CHAN_WIDTH_40) {
+ /* we both use VHT */
+ struct ieee80211_vht_cap cap_ie;
+ struct ieee80211_sta_vht_cap cap = sta->sta.vht_cap;
+
+ ieee80211_vht_oper_to_chandef(channel,
+ elems->vht_operation,
+ &chandef);
+ memcpy(&cap_ie, elems->vht_cap_elem, sizeof(cap_ie));
+ ieee80211_vht_cap_ie_to_sta_vht_cap(sdata, sband,
+ &cap_ie, sta);
+ if (memcmp(&cap, &sta->sta.vht_cap, sizeof(cap)))
+ rates_updated |= true;
+ }
+
+ if (bw != sta->sta.bandwidth)
+ rates_updated |= true;
+
+ if (!cfg80211_chandef_compatible(&sdata->u.ibss.chandef,
+ &chandef))
+ WARN_ON_ONCE(1);
+ }
+
+ if (sta && rates_updated) {
+ u32 changed = IEEE80211_RC_SUPP_RATES_CHANGED;
+ u8 rx_nss = sta->sta.rx_nss;
+
+ /* Force rx_nss recalculation */
+ sta->sta.rx_nss = 0;
+ rate_control_rate_init(sta);
+ if (sta->sta.rx_nss != rx_nss)
+ changed |= IEEE80211_RC_NSS_CHANGED;
+
+ drv_sta_rc_update(local, sdata, &sta->sta, changed);
+ }
+
+ rcu_read_unlock();
+}
+
+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)
+{
+ struct ieee80211_local *local = sdata->local;
+ struct cfg80211_bss *cbss;
+ struct ieee80211_bss *bss;
+ struct ieee80211_channel *channel;
+ u64 beacon_timestamp, rx_timestamp;
+ u32 supp_rates = 0;
+ enum ieee80211_band band = rx_status->band;
+
+ channel = ieee80211_get_channel(local->hw.wiphy, rx_status->freq);
+ if (!channel)
+ return;
+
+ ieee80211_update_sta_info(sdata, mgmt, len, rx_status, elems, channel);
+
+ bss = ieee80211_bss_info_update(local, rx_status, mgmt, len, elems,
+ channel);
+ if (!bss)
+ return;
+
+ cbss = container_of((void *)bss, struct cfg80211_bss, priv);
+
+ /* same for beacon and probe response */
+ beacon_timestamp = le64_to_cpu(mgmt->u.beacon.timestamp);
+
+ /* check if we need to merge IBSS */
+
+ /* not an IBSS */
+ if (!(cbss->capability & WLAN_CAPABILITY_IBSS))
+ goto put_bss;
+
+ /* different channel */
+ if (sdata->u.ibss.fixed_channel &&
+ sdata->u.ibss.chandef.chan != cbss->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;
+
+ /* process channel switch */
+ if (sdata->vif.csa_active ||
+ ieee80211_ibss_process_chanswitch(sdata, elems, true))
+ goto put_bss;
+
+ /* same BSSID */
+ if (ether_addr_equal(cbss->bssid, sdata->u.ibss.bssid))
+ goto put_bss;
+
+ /* we use a fixed BSSID */
+ if (sdata->u.ibss.fixed_bssid)
+ goto put_bss;
+
+ if (ieee80211_have_rx_timestamp(rx_status)) {
+ /* time when timestamp field was received */
+ rx_timestamp =
+ ieee80211_calculate_rx_timestamp(local, rx_status,
+ len + FCS_LEN, 24);
+ } else {
+ /*
+ * second best option: get current TSF
+ * (will return -1 if not supported)
+ */
+ rx_timestamp = drv_get_tsf(local, sdata);
+ }
+
+ ibss_dbg(sdata,
+ "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);
+
+ if (beacon_timestamp > rx_timestamp) {
+ ibss_dbg(sdata,
+ "beacon TSF higher than local TSF - IBSS merge with BSSID %pM\n",
+ mgmt->bssid);
+ ieee80211_sta_join_ibss(sdata, bss);
+ supp_rates = ieee80211_sta_get_rates(sdata, elems, band, NULL);
+ ieee80211_ibss_add_sta(sdata, mgmt->bssid, mgmt->sa,
+ supp_rates);
+ 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;
+ struct ieee80211_chanctx_conf *chanctx_conf;
+ struct ieee80211_supported_band *sband;
+ enum nl80211_bss_scan_width scan_width;
+ int 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) {
+ net_info_ratelimited("%s: No room for a new IBSS STA entry %pM\n",
+ sdata->name, addr);
+ return;
+ }
+
+ if (ifibss->state == IEEE80211_IBSS_MLME_SEARCH)
+ return;
+
+ if (!ether_addr_equal(bssid, sdata->u.ibss.bssid))
+ return;
+
+ rcu_read_lock();
+ chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
+ if (WARN_ON_ONCE(!chanctx_conf)) {
+ rcu_read_unlock();
+ return;
+ }
+ band = chanctx_conf->def.chan->band;
+ scan_width = cfg80211_chandef_to_scan_width(&chanctx_conf->def);
+ rcu_read_unlock();
+
+ sta = sta_info_alloc(sdata, addr, GFP_ATOMIC);
+ if (!sta)
+ return;
+
+ sta->last_rx = jiffies;
+
+ /* make sure mandatory rates are always added */
+ sband = local->hw.wiphy->bands[band];
+ sta->sta.supp_rates[band] = supp_rates |
+ ieee80211_mandatory_rates(sband, scan_width);
+
+ 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 void ieee80211_ibss_sta_expire(struct ieee80211_sub_if_data *sdata)
+{
+ struct ieee80211_local *local = sdata->local;
+ struct sta_info *sta, *tmp;
+ unsigned long exp_time = IEEE80211_IBSS_INACTIVITY_LIMIT;
+ unsigned long exp_rsn_time = IEEE80211_IBSS_RSN_INACTIVITY_LIMIT;
+
+ mutex_lock(&local->sta_mtx);
+
+ list_for_each_entry_safe(sta, tmp, &local->sta_list, list) {
+ if (sdata != sta->sdata)
+ continue;
+
+ if (time_after(jiffies, sta->last_rx + exp_time) ||
+ (time_after(jiffies, sta->last_rx + exp_rsn_time) &&
+ sta->sta_state != IEEE80211_STA_AUTHORIZED)) {
+ sta_dbg(sta->sdata, "expiring inactive %sSTA %pM\n",
+ sta->sta_state != IEEE80211_STA_AUTHORIZED ?
+ "not authorized " : "", sta->sta.addr);
+
+ WARN_ON(__sta_info_destroy(sta));
+ }
+ }
+
+ mutex_unlock(&local->sta_mtx);
+}
+
+/*
+ * 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;
+ enum nl80211_bss_scan_width scan_width;
+
+ sdata_assert_lock(sdata);
+
+ mod_timer(&ifibss->timer,
+ round_jiffies(jiffies + IEEE80211_IBSS_MERGE_INTERVAL));
+
+ ieee80211_ibss_sta_expire(sdata);
+
+ 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;
+
+ sdata_info(sdata,
+ "No active IBSS STAs - trying to scan for other IBSS networks with same SSID (merge)\n");
+
+ scan_width = cfg80211_chandef_to_scan_width(&ifibss->chandef);
+ ieee80211_request_ibss_scan(sdata, ifibss->ssid, ifibss->ssid_len,
+ NULL, 0, scan_width);
+}
+
+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;
+
+ sdata_assert_lock(sdata);
+
+ 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;
+ }
+
+ sdata_info(sdata, "Creating new IBSS network, BSSID %pM\n", bssid);
+
+ capability = WLAN_CAPABILITY_IBSS;
+
+ if (ifibss->privacy)
+ capability |= WLAN_CAPABILITY_PRIVACY;
+
+ __ieee80211_sta_join_ibss(sdata, bssid, sdata->vif.bss_conf.beacon_int,
+ &ifibss->chandef, ifibss->basic_rates,
+ capability, 0, true);
+}
+
+static unsigned ibss_setup_channels(struct wiphy *wiphy,
+ struct ieee80211_channel **channels,
+ unsigned int channels_max,
+ u32 center_freq, u32 width)
+{
+ struct ieee80211_channel *chan = NULL;
+ unsigned int n_chan = 0;
+ u32 start_freq, end_freq, freq;
+
+ if (width <= 20) {
+ start_freq = center_freq;
+ end_freq = center_freq;
+ } else {
+ start_freq = center_freq - width / 2 + 10;
+ end_freq = center_freq + width / 2 - 10;
+ }
+
+ for (freq = start_freq; freq <= end_freq; freq += 20) {
+ chan = ieee80211_get_channel(wiphy, freq);
+ if (!chan)
+ continue;
+ if (n_chan >= channels_max)
+ return n_chan;
+
+ channels[n_chan] = chan;
+ n_chan++;
+ }
+
+ return n_chan;
+}
+
+static unsigned int
+ieee80211_ibss_setup_scan_channels(struct wiphy *wiphy,
+ const struct cfg80211_chan_def *chandef,
+ struct ieee80211_channel **channels,
+ unsigned int channels_max)
+{
+ unsigned int n_chan = 0;
+ u32 width, cf1, cf2 = 0;
+
+ switch (chandef->width) {
+ case NL80211_CHAN_WIDTH_40:
+ width = 40;
+ break;
+ case NL80211_CHAN_WIDTH_80P80:
+ cf2 = chandef->center_freq2;
+ /* fall through */
+ case NL80211_CHAN_WIDTH_80:
+ width = 80;
+ break;
+ case NL80211_CHAN_WIDTH_160:
+ width = 160;
+ break;
+ default:
+ width = 20;
+ break;
+ }
+
+ cf1 = chandef->center_freq1;
+
+ n_chan = ibss_setup_channels(wiphy, channels, channels_max, cf1, width);
+
+ if (cf2)
+ n_chan += ibss_setup_channels(wiphy, &channels[n_chan],
+ channels_max - n_chan, cf2,
+ width);
+
+ return n_chan;
+}
+
+/*
+ * 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;
+ enum nl80211_bss_scan_width scan_width;
+ int active_ibss;
+
+ sdata_assert_lock(sdata);
+
+ active_ibss = ieee80211_sta_active_ibss(sdata);
+ ibss_dbg(sdata, "sta_find_ibss (active_ibss=%d)\n", active_ibss);
+
+ if (active_ibss)
+ return;
+
+ if (ifibss->fixed_bssid)
+ bssid = ifibss->bssid;
+ if (ifibss->fixed_channel)
+ chan = ifibss->chandef.chan;
+ if (!is_zero_ether_addr(ifibss->bssid))
+ bssid = ifibss->bssid;
+ cbss = cfg80211_get_bss(local->hw.wiphy, chan, bssid,
+ ifibss->ssid, ifibss->ssid_len,
+ IEEE80211_BSS_TYPE_IBSS,
+ IEEE80211_PRIVACY(ifibss->privacy));
+
+ if (cbss) {
+ struct ieee80211_bss *bss;
+
+ bss = (void *)cbss->priv;
+ ibss_dbg(sdata,
+ "sta_find_ibss: selected %pM current %pM\n",
+ cbss->bssid, ifibss->bssid);
+ sdata_info(sdata,
+ "Selected IBSS BSSID %pM based on configured SSID\n",
+ cbss->bssid);
+
+ ieee80211_sta_join_ibss(sdata, bss);
+ ieee80211_rx_bss_put(local, bss);
+ return;
+ }
+
+ /* if a fixed bssid and a fixed freq have been provided create the IBSS
+ * directly and do not waste time scanning
+ */
+ if (ifibss->fixed_bssid && ifibss->fixed_channel) {
+ sdata_info(sdata, "Created IBSS using preconfigured BSSID %pM\n",
+ bssid);
+ ieee80211_sta_create_ibss(sdata);
+ return;
+ }
+
+
+ ibss_dbg(sdata, "sta_find_ibss: did not try to join ibss\n");
+
+ /* Selected IBSS not found in current scan results - try to scan */
+ if (time_after(jiffies, ifibss->last_scan_completed +
+ IEEE80211_SCAN_INTERVAL)) {
+ struct ieee80211_channel *channels[8];
+ unsigned int num;
+
+ sdata_info(sdata, "Trigger new scan to find an IBSS to join\n");
+
+ num = ieee80211_ibss_setup_scan_channels(local->hw.wiphy,
+ &ifibss->chandef,
+ channels,
+ ARRAY_SIZE(channels));
+ scan_width = cfg80211_chandef_to_scan_width(&ifibss->chandef);
+ ieee80211_request_ibss_scan(sdata, ifibss->ssid,
+ ifibss->ssid_len, channels, num,
+ scan_width);
+ } else {
+ int interval = IEEE80211_SCAN_INTERVAL;
+
+ if (time_after(jiffies, ifibss->ibss_join_req +
+ IEEE80211_IBSS_JOIN_TIMEOUT))
+ ieee80211_sta_create_ibss(sdata);
+
+ 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 beacon_data *presp;
+ u8 *pos, *end;
+
+ sdata_assert_lock(sdata);
+
+ presp = rcu_dereference_protected(ifibss->presp,
+ lockdep_is_held(&sdata->wdev.mtx));
+
+ if (ifibss->state != IEEE80211_IBSS_MLME_JOINED ||
+ len < 24 + 2 || !presp)
+ return;
+
+ tx_last_beacon = drv_tx_last_beacon(local);
+
+ ibss_dbg(sdata,
+ "RX ProbeReq SA=%pM DA=%pM BSSID=%pM (tx_last_beacon=%d)\n",
+ mgmt->sa, mgmt->da, mgmt->bssid, tx_last_beacon);
+
+ if (!tx_last_beacon && is_multicast_ether_addr(mgmt->da))
+ return;
+
+ if (!ether_addr_equal(mgmt->bssid, ifibss->bssid) &&
+ !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) {
+ ibss_dbg(sdata, "Invalid SSID IE in ProbeReq from %pM\n",
+ mgmt->sa);
+ 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 = dev_alloc_skb(local->tx_headroom + presp->head_len);
+ if (!skb)
+ return;
+
+ skb_reserve(skb, local->tx_headroom);
+ memcpy(skb_put(skb, presp->head_len), presp->head, presp->head_len);
+
+ memcpy(((struct ieee80211_mgmt *) skb->data)->da, mgmt->sa, ETH_ALEN);
+ ibss_dbg(sdata, "Sending ProbeResp to %pM\n", mgmt->sa);
+ IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
+
+ /* avoid excessive retries for probe request to wildcard SSIDs */
+ if (pos[1] == 0)
+ IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_CTL_NO_ACK;
+
+ ieee80211_tx_skb(sdata, skb);
+}
+
+static
+void ieee80211_rx_mgmt_probe_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;
+
+ BUILD_BUG_ON(offsetof(typeof(mgmt->u.probe_resp), variable) !=
+ offsetof(typeof(mgmt->u.beacon), variable));
+
+ /*
+ * either beacon or probe_resp but the variable field is at the
+ * same offset
+ */
+ baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt;
+ if (baselen > len)
+ return;
+
+ ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen,
+ false, &elems);
+
+ ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems);
+}
+
+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;
+ struct ieee802_11_elems elems;
+ int ies_len;
+
+ rx_status = IEEE80211_SKB_RXCB(skb);
+ mgmt = (struct ieee80211_mgmt *) skb->data;
+ fc = le16_to_cpu(mgmt->frame_control);
+
+ sdata_lock(sdata);
+
+ 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:
+ case IEEE80211_STYPE_BEACON:
+ ieee80211_rx_mgmt_probe_beacon(sdata, mgmt, skb->len,
+ rx_status);
+ break;
+ case IEEE80211_STYPE_AUTH:
+ ieee80211_rx_mgmt_auth_ibss(sdata, mgmt, skb->len);
+ break;
+ case IEEE80211_STYPE_DEAUTH:
+ ieee80211_rx_mgmt_deauth_ibss(sdata, mgmt, skb->len);
+ break;
+ case IEEE80211_STYPE_ACTION:
+ switch (mgmt->u.action.category) {
+ case WLAN_CATEGORY_SPECTRUM_MGMT:
+ ies_len = skb->len -
+ offsetof(struct ieee80211_mgmt,
+ u.action.u.chan_switch.variable);
+
+ if (ies_len < 0)
+ break;
+
+ ieee802_11_parse_elems(
+ mgmt->u.action.u.chan_switch.variable,
+ ies_len, true, &elems);
+
+ if (elems.parse_error)
+ break;
+
+ ieee80211_rx_mgmt_spectrum_mgmt(sdata, mgmt, skb->len,
+ rx_status, &elems);
+ break;
+ }
+ }
+
+ mgmt_out:
+ sdata_unlock(sdata);
+}
+
+void ieee80211_ibss_work(struct ieee80211_sub_if_data *sdata)
+{
+ struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
+ struct sta_info *sta;
+
+ sdata_lock(sdata);
+
+ /*
+ * 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);
+ 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:
+ sdata_unlock(sdata);
+}
+
+static void ieee80211_ibss_timer(unsigned long data)
+{
+ struct ieee80211_sub_if_data *sdata =
+ (struct ieee80211_sub_if_data *) data;
+
+ ieee80211_queue_work(&sdata->local->hw, &sdata->work);
+}
+
+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);
+ INIT_LIST_HEAD(&ifibss->incomplete_stations);
+ spin_lock_init(&ifibss->incomplete_lock);
+ INIT_WORK(&ifibss->csa_connection_drop_work,
+ ieee80211_csa_connection_drop_work);
+}
+
+/* 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)
+{
+ u32 changed = 0;
+ u32 rate_flags;
+ struct ieee80211_supported_band *sband;
+ enum ieee80211_chanctx_mode chanmode;
+ struct ieee80211_local *local = sdata->local;
+ int radar_detect_width = 0;
+ int i;
+ int ret;
+
+ ret = cfg80211_chandef_dfs_required(local->hw.wiphy,
+ ¶ms->chandef,
+ sdata->wdev.iftype);
+ if (ret < 0)
+ return ret;
+
+ if (ret > 0) {
+ if (!params->userspace_handles_dfs)
+ return -EINVAL;
+ radar_detect_width = BIT(params->chandef.width);
+ }
+
+ chanmode = (params->channel_fixed && !ret) ?
+ IEEE80211_CHANCTX_SHARED : IEEE80211_CHANCTX_EXCLUSIVE;
+
+ mutex_lock(&local->chanctx_mtx);
+ ret = ieee80211_check_combinations(sdata, ¶ms->chandef, chanmode,
+ radar_detect_width);
+ mutex_unlock(&local->chanctx_mtx);
+ if (ret < 0)
+ return ret;
+
+ 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.userspace_handles_dfs = params->userspace_handles_dfs;
+ sdata->u.ibss.basic_rates = params->basic_rates;
+ sdata->u.ibss.last_scan_completed = jiffies;
+
+ /* fix basic_rates if channel does not support these rates */
+ rate_flags = ieee80211_chandef_rate_flags(¶ms->chandef);
+ sband = local->hw.wiphy->bands[params->chandef.chan->band];
+ for (i = 0; i < sband->n_bitrates; i++) {
+ if ((rate_flags & sband->bitrates[i].flags) != rate_flags)
+ sdata->u.ibss.basic_rates &= ~BIT(i);
+ }
+ 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.chandef = params->chandef;
+ sdata->u.ibss.fixed_channel = params->channel_fixed;
+
+ 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.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;
+
+ memcpy(&sdata->u.ibss.ht_capa, ¶ms->ht_capa,
+ sizeof(sdata->u.ibss.ht_capa));
+ memcpy(&sdata->u.ibss.ht_capa_mask, ¶ms->ht_capa_mask,
+ sizeof(sdata->u.ibss.ht_capa_mask));
+
+ /*
+ * 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);
+
+ sdata->smps_mode = IEEE80211_SMPS_OFF;
+ sdata->needed_rx_chains = local->rx_chains;
+
+ ieee80211_queue_work(&local->hw, &sdata->work);
+
+ return 0;
+}
+
+int ieee80211_ibss_leave(struct ieee80211_sub_if_data *sdata)
+{
+ struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
+
+ ieee80211_ibss_disconnect(sdata);
+ ifibss->ssid_len = 0;
+ eth_zero_addr(ifibss->bssid);
+
+ /* remove beacon */
+ kfree(sdata->u.ibss.ie);
+
+ /* on the next join, re-program HT parameters */
+ memset(&ifibss->ht_capa, 0, sizeof(ifibss->ht_capa));
+ memset(&ifibss->ht_capa_mask, 0, sizeof(ifibss->ht_capa_mask));
+
+ synchronize_rcu();
+
+ skb_queue_purge(&sdata->skb_queue);
+
+ del_timer_sync(&sdata->u.ibss.timer);
+
+ return 0;
+}
Code Review / kvmfornfv.git / blobdiff