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00015 #include <linux/delay.h>
00016 #include <linux/slab.h>
00017 #include <linux/if_ether.h>
00018 #include <linux/skbuff.h>
00019 #include <linux/if_arp.h>
00020 #include <linux/etherdevice.h>
00021 #include <linux/rtnetlink.h>
00022 #include <net/mac80211.h>
00023
00024 #include "ieee80211_i.h"
00025 #include "driver-ops.h"
00026 #include "rate.h"
00027
00028 #define IEEE80211_SCAN_INTERVAL (2 * HZ)
00029 #define IEEE80211_SCAN_INTERVAL_SLOW (15 * HZ)
00030 #define IEEE80211_IBSS_JOIN_TIMEOUT (7 * HZ)
00031
00032 #define IEEE80211_IBSS_MERGE_INTERVAL (30 * HZ)
00033 #define IEEE80211_IBSS_INACTIVITY_LIMIT (60 * HZ)
00034
00035 #define IEEE80211_IBSS_MAX_STA_ENTRIES 128
00036
00037
00038 static void __ieee80211_sta_join_ibss(struct ieee80211_sub_if_data *sdata,
00039 const u8 *bssid, const int beacon_int,
00040 struct ieee80211_channel *chan,
00041 const u32 basic_rates,
00042 const u16 capability, u64 tsf)
00043 {
00044 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
00045 struct ieee80211_local *local = sdata->local;
00046 int rates, i;
00047 struct sk_buff *skb;
00048 struct ieee80211_mgmt *mgmt;
00049 u8 *pos;
00050 struct ieee80211_supported_band *sband;
00051 struct cfg80211_bss *bss;
00052 u32 bss_change;
00053 u8 supp_rates[IEEE80211_MAX_SUPP_RATES];
00054 enum nl80211_channel_type channel_type;
00055
00056 lockdep_assert_held(&ifibss->mtx);
00057
00058
00059 drv_reset_tsf(local, sdata);
00060
00061 skb = ifibss->skb;
00062 RCU_INIT_POINTER(ifibss->presp, NULL);
00063 synchronize_rcu();
00064 skb->data = skb->head;
00065 skb->len = 0;
00066 skb_reset_tail_pointer(skb);
00067 skb_reserve(skb, sdata->local->hw.extra_tx_headroom);
00068
00069 if (!ether_addr_equal(ifibss->bssid, bssid))
00070 sta_info_flush(sdata->local, sdata);
00071
00072
00073 if (sdata->vif.bss_conf.ibss_joined) {
00074 sdata->vif.bss_conf.ibss_joined = false;
00075 netif_carrier_off(sdata->dev);
00076 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_IBSS);
00077 }
00078
00079 memcpy(ifibss->bssid, bssid, ETH_ALEN);
00080
00081 sdata->drop_unencrypted = capability & WLAN_CAPABILITY_PRIVACY ? 1 : 0;
00082
00083 local->oper_channel = chan;
00084 channel_type = ifibss->channel_type;
00085 if (channel_type > NL80211_CHAN_HT20 &&
00086 !cfg80211_can_beacon_sec_chan(local->hw.wiphy, chan, channel_type))
00087 channel_type = NL80211_CHAN_HT20;
00088 if (!ieee80211_set_channel_type(local, sdata, channel_type)) {
00089
00090 channel_type = NL80211_CHAN_HT20;
00091 WARN_ON(!ieee80211_set_channel_type(local, sdata,
00092 NL80211_CHAN_HT20));
00093 }
00094 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_CHANNEL);
00095
00096 sband = local->hw.wiphy->bands[chan->band];
00097
00098
00099 pos = supp_rates;
00100 for (i = 0; i < sband->n_bitrates; i++) {
00101 int rate = sband->bitrates[i].bitrate;
00102 u8 basic = 0;
00103 if (basic_rates & BIT(i))
00104 basic = 0x80;
00105 *pos++ = basic | (u8) (rate / 5);
00106 }
00107
00108
00109 mgmt = (void *) skb_put(skb, 24 + sizeof(mgmt->u.beacon));
00110 memset(mgmt, 0, 24 + sizeof(mgmt->u.beacon));
00111 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
00112 IEEE80211_STYPE_PROBE_RESP);
00113 memset(mgmt->da, 0xff, ETH_ALEN);
00114 memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
00115 memcpy(mgmt->bssid, ifibss->bssid, ETH_ALEN);
00116 mgmt->u.beacon.beacon_int = cpu_to_le16(beacon_int);
00117 mgmt->u.beacon.timestamp = cpu_to_le64(tsf);
00118 mgmt->u.beacon.capab_info = cpu_to_le16(capability);
00119
00120 pos = skb_put(skb, 2 + ifibss->ssid_len);
00121 *pos++ = WLAN_EID_SSID;
00122 *pos++ = ifibss->ssid_len;
00123 memcpy(pos, ifibss->ssid, ifibss->ssid_len);
00124
00125 rates = sband->n_bitrates;
00126 if (rates > 8)
00127 rates = 8;
00128 pos = skb_put(skb, 2 + rates);
00129 *pos++ = WLAN_EID_SUPP_RATES;
00130 *pos++ = rates;
00131 memcpy(pos, supp_rates, rates);
00132
00133 if (sband->band == IEEE80211_BAND_2GHZ) {
00134 pos = skb_put(skb, 2 + 1);
00135 *pos++ = WLAN_EID_DS_PARAMS;
00136 *pos++ = 1;
00137 *pos++ = ieee80211_frequency_to_channel(chan->center_freq);
00138 }
00139
00140 pos = skb_put(skb, 2 + 2);
00141 *pos++ = WLAN_EID_IBSS_PARAMS;
00142 *pos++ = 2;
00143
00144 *pos++ = 0;
00145 *pos++ = 0;
00146
00147 if (sband->n_bitrates > 8) {
00148 rates = sband->n_bitrates - 8;
00149 pos = skb_put(skb, 2 + rates);
00150 *pos++ = WLAN_EID_EXT_SUPP_RATES;
00151 *pos++ = rates;
00152 memcpy(pos, &supp_rates[8], rates);
00153 }
00154
00155 if (ifibss->ie_len)
00156 memcpy(skb_put(skb, ifibss->ie_len),
00157 ifibss->ie, ifibss->ie_len);
00158
00159
00160 if (channel_type && sband->ht_cap.ht_supported) {
00161 pos = skb_put(skb, 4 +
00162 sizeof(struct ieee80211_ht_cap) +
00163 sizeof(struct ieee80211_ht_operation));
00164 pos = ieee80211_ie_build_ht_cap(pos, &sband->ht_cap,
00165 sband->ht_cap.cap);
00166
00167
00168
00169
00170
00171 pos = ieee80211_ie_build_ht_oper(pos, &sband->ht_cap,
00172 chan, channel_type, 0);
00173 }
00174
00175 if (local->hw.queues >= IEEE80211_NUM_ACS) {
00176 pos = skb_put(skb, 9);
00177 *pos++ = WLAN_EID_VENDOR_SPECIFIC;
00178 *pos++ = 7;
00179 *pos++ = 0x00;
00180 *pos++ = 0x50;
00181 *pos++ = 0xf2;
00182 *pos++ = 2;
00183 *pos++ = 0;
00184 *pos++ = 1;
00185 *pos++ = 0;
00186 }
00187
00188 rcu_assign_pointer(ifibss->presp, skb);
00189
00190 sdata->vif.bss_conf.beacon_int = beacon_int;
00191 sdata->vif.bss_conf.basic_rates = basic_rates;
00192 bss_change = BSS_CHANGED_BEACON_INT;
00193 bss_change |= ieee80211_reset_erp_info(sdata);
00194 bss_change |= BSS_CHANGED_BSSID;
00195 bss_change |= BSS_CHANGED_BEACON;
00196 bss_change |= BSS_CHANGED_BEACON_ENABLED;
00197 bss_change |= BSS_CHANGED_BASIC_RATES;
00198 bss_change |= BSS_CHANGED_HT;
00199 bss_change |= BSS_CHANGED_IBSS;
00200 sdata->vif.bss_conf.ibss_joined = true;
00201 ieee80211_bss_info_change_notify(sdata, bss_change);
00202
00203 ieee80211_sta_def_wmm_params(sdata, sband->n_bitrates, supp_rates);
00204
00205 ifibss->state = IEEE80211_IBSS_MLME_JOINED;
00206 mod_timer(&ifibss->timer,
00207 round_jiffies(jiffies + IEEE80211_IBSS_MERGE_INTERVAL));
00208
00209 bss = cfg80211_inform_bss_frame(local->hw.wiphy, local->hw.conf.channel,
00210 mgmt, skb->len, 0, GFP_KERNEL);
00211 cfg80211_put_bss(bss);
00212 netif_carrier_on(sdata->dev);
00213 cfg80211_ibss_joined(sdata->dev, ifibss->bssid, GFP_KERNEL);
00214 }
00215
00216 static void ieee80211_sta_join_ibss(struct ieee80211_sub_if_data *sdata,
00217 struct ieee80211_bss *bss)
00218 {
00219 struct cfg80211_bss *cbss =
00220 container_of((void *)bss, struct cfg80211_bss, priv);
00221 struct ieee80211_supported_band *sband;
00222 u32 basic_rates;
00223 int i, j;
00224 u16 beacon_int = cbss->beacon_interval;
00225
00226 lockdep_assert_held(&sdata->u.ibss.mtx);
00227
00228 if (beacon_int < 10)
00229 beacon_int = 10;
00230
00231 sband = sdata->local->hw.wiphy->bands[cbss->channel->band];
00232
00233 basic_rates = 0;
00234
00235 for (i = 0; i < bss->supp_rates_len; i++) {
00236 int rate = (bss->supp_rates[i] & 0x7f) * 5;
00237 bool is_basic = !!(bss->supp_rates[i] & 0x80);
00238
00239 for (j = 0; j < sband->n_bitrates; j++) {
00240 if (sband->bitrates[j].bitrate == rate) {
00241 if (is_basic)
00242 basic_rates |= BIT(j);
00243 break;
00244 }
00245 }
00246 }
00247
00248 __ieee80211_sta_join_ibss(sdata, cbss->bssid,
00249 beacon_int,
00250 cbss->channel,
00251 basic_rates,
00252 cbss->capability,
00253 cbss->tsf);
00254 }
00255
00256 static struct sta_info *ieee80211_ibss_finish_sta(struct sta_info *sta,
00257 bool auth)
00258 __acquires(RCU)
00259 {
00260 struct ieee80211_sub_if_data *sdata = sta->sdata;
00261 u8 addr[ETH_ALEN];
00262
00263 memcpy(addr, sta->sta.addr, ETH_ALEN);
00264
00265 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
00266 wiphy_debug(sdata->local->hw.wiphy,
00267 "Adding new IBSS station %pM (dev=%s)\n",
00268 addr, sdata->name);
00269 #endif
00270
00271 sta_info_pre_move_state(sta, IEEE80211_STA_AUTH);
00272 sta_info_pre_move_state(sta, IEEE80211_STA_ASSOC);
00273
00274
00275 if (!sta->sdata->u.ibss.control_port)
00276 sta_info_pre_move_state(sta, IEEE80211_STA_AUTHORIZED);
00277
00278 rate_control_rate_init(sta);
00279
00280
00281 if (sta_info_insert_rcu(sta))
00282 return sta_info_get(sdata, addr);
00283 if (auth) {
00284 #ifdef CONFIG_MAC80211_IBSS_DEBUG
00285 printk(KERN_DEBUG "TX Auth SA=%pM DA=%pM BSSID=%pM"
00286 "(auth_transaction=1)\n", sdata->vif.addr,
00287 sdata->u.ibss.bssid, addr);
00288 #endif
00289 ieee80211_send_auth(sdata, 1, WLAN_AUTH_OPEN, NULL, 0,
00290 addr, sdata->u.ibss.bssid, NULL, 0, 0);
00291 }
00292 return sta;
00293 }
00294
00295 static struct sta_info *
00296 ieee80211_ibss_add_sta(struct ieee80211_sub_if_data *sdata,
00297 const u8 *bssid, const u8 *addr,
00298 u32 supp_rates, bool auth)
00299 __acquires(RCU)
00300 {
00301 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
00302 struct ieee80211_local *local = sdata->local;
00303 struct sta_info *sta;
00304 int band = local->hw.conf.channel->band;
00305
00306
00307
00308
00309
00310 if (local->num_sta >= IEEE80211_IBSS_MAX_STA_ENTRIES) {
00311 net_dbg_ratelimited("%s: No room for a new IBSS STA entry %pM\n",
00312 sdata->name, addr);
00313 rcu_read_lock();
00314 return NULL;
00315 }
00316
00317 if (ifibss->state == IEEE80211_IBSS_MLME_SEARCH) {
00318 rcu_read_lock();
00319 return NULL;
00320 }
00321
00322 if (!ether_addr_equal(bssid, sdata->u.ibss.bssid)) {
00323 rcu_read_lock();
00324 return NULL;
00325 }
00326
00327 sta = sta_info_alloc(sdata, addr, GFP_KERNEL);
00328 if (!sta) {
00329 rcu_read_lock();
00330 return NULL;
00331 }
00332
00333 sta->last_rx = jiffies;
00334
00335
00336 sta->sta.supp_rates[band] = supp_rates |
00337 ieee80211_mandatory_rates(local, band);
00338
00339 return ieee80211_ibss_finish_sta(sta, auth);
00340 }
00341
00342 static void ieee80211_rx_mgmt_auth_ibss(struct ieee80211_sub_if_data *sdata,
00343 struct ieee80211_mgmt *mgmt,
00344 size_t len)
00345 {
00346 u16 auth_alg, auth_transaction;
00347
00348 lockdep_assert_held(&sdata->u.ibss.mtx);
00349
00350 if (len < 24 + 6)
00351 return;
00352
00353 auth_alg = le16_to_cpu(mgmt->u.auth.auth_alg);
00354 auth_transaction = le16_to_cpu(mgmt->u.auth.auth_transaction);
00355
00356 if (auth_alg != WLAN_AUTH_OPEN || auth_transaction != 1)
00357 return;
00358 #ifdef CONFIG_MAC80211_IBSS_DEBUG
00359 printk(KERN_DEBUG "%s: RX Auth SA=%pM DA=%pM BSSID=%pM."
00360 "(auth_transaction=%d)\n",
00361 sdata->name, mgmt->sa, mgmt->da, mgmt->bssid, auth_transaction);
00362 #endif
00363 sta_info_destroy_addr(sdata, mgmt->sa);
00364 ieee80211_ibss_add_sta(sdata, mgmt->bssid, mgmt->sa, 0, false);
00365 rcu_read_unlock();
00366
00367
00368
00369
00370
00371
00372
00373 ieee80211_send_auth(sdata, 2, WLAN_AUTH_OPEN, NULL, 0,
00374 mgmt->sa, sdata->u.ibss.bssid, NULL, 0, 0);
00375 }
00376
00377 static void ieee80211_rx_bss_info(struct ieee80211_sub_if_data *sdata,
00378 struct ieee80211_mgmt *mgmt,
00379 size_t len,
00380 struct ieee80211_rx_status *rx_status,
00381 struct ieee802_11_elems *elems,
00382 bool beacon)
00383 {
00384 struct ieee80211_local *local = sdata->local;
00385 int freq;
00386 struct cfg80211_bss *cbss;
00387 struct ieee80211_bss *bss;
00388 struct sta_info *sta;
00389 struct ieee80211_channel *channel;
00390 u64 beacon_timestamp, rx_timestamp;
00391 u32 supp_rates = 0;
00392 enum ieee80211_band band = rx_status->band;
00393 struct ieee80211_supported_band *sband = local->hw.wiphy->bands[band];
00394 bool rates_updated = false;
00395
00396 if (elems->ds_params && elems->ds_params_len == 1)
00397 freq = ieee80211_channel_to_frequency(elems->ds_params[0],
00398 band);
00399 else
00400 freq = rx_status->freq;
00401
00402 channel = ieee80211_get_channel(local->hw.wiphy, freq);
00403
00404 if (!channel || channel->flags & IEEE80211_CHAN_DISABLED)
00405 return;
00406
00407 if (sdata->vif.type == NL80211_IFTYPE_ADHOC &&
00408 ether_addr_equal(mgmt->bssid, sdata->u.ibss.bssid)) {
00409
00410 rcu_read_lock();
00411 sta = sta_info_get(sdata, mgmt->sa);
00412
00413 if (elems->supp_rates) {
00414 supp_rates = ieee80211_sta_get_rates(local, elems,
00415 band, NULL);
00416 if (sta) {
00417 u32 prev_rates;
00418
00419 prev_rates = sta->sta.supp_rates[band];
00420
00421 sta->sta.supp_rates[band] = supp_rates |
00422 ieee80211_mandatory_rates(local, band);
00423
00424 if (sta->sta.supp_rates[band] != prev_rates) {
00425 #ifdef CONFIG_MAC80211_IBSS_DEBUG
00426 printk(KERN_DEBUG
00427 "%s: updated supp_rates set "
00428 "for %pM based on beacon"
00429 "/probe_resp (0x%x -> 0x%x)\n",
00430 sdata->name, sta->sta.addr,
00431 prev_rates,
00432 sta->sta.supp_rates[band]);
00433 #endif
00434 rates_updated = true;
00435 }
00436 } else {
00437 rcu_read_unlock();
00438 sta = ieee80211_ibss_add_sta(sdata, mgmt->bssid,
00439 mgmt->sa, supp_rates, true);
00440 }
00441 }
00442
00443 if (sta && elems->wmm_info)
00444 set_sta_flag(sta, WLAN_STA_WME);
00445
00446 if (sta && elems->ht_operation && elems->ht_cap_elem &&
00447 sdata->u.ibss.channel_type != NL80211_CHAN_NO_HT) {
00448
00449 struct ieee80211_sta_ht_cap sta_ht_cap_new;
00450 enum nl80211_channel_type channel_type =
00451 ieee80211_ht_oper_to_channel_type(
00452 elems->ht_operation);
00453
00454 ieee80211_ht_cap_ie_to_sta_ht_cap(sdata, sband,
00455 elems->ht_cap_elem,
00456 &sta_ht_cap_new);
00457
00458
00459
00460
00461
00462 if (!(channel_type == NL80211_CHAN_HT40MINUS ||
00463 channel_type == NL80211_CHAN_HT40PLUS) ||
00464 channel_type != sdata->u.ibss.channel_type)
00465 sta_ht_cap_new.cap &=
00466 ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
00467
00468 if (memcmp(&sta->sta.ht_cap, &sta_ht_cap_new,
00469 sizeof(sta_ht_cap_new))) {
00470 memcpy(&sta->sta.ht_cap, &sta_ht_cap_new,
00471 sizeof(sta_ht_cap_new));
00472 rates_updated = true;
00473 }
00474 }
00475
00476 if (sta && rates_updated)
00477 rate_control_rate_init(sta);
00478
00479 rcu_read_unlock();
00480 }
00481
00482 bss = ieee80211_bss_info_update(local, rx_status, mgmt, len, elems,
00483 channel, beacon);
00484 if (!bss)
00485 return;
00486
00487 cbss = container_of((void *)bss, struct cfg80211_bss, priv);
00488
00489
00490 beacon_timestamp = cbss->tsf;
00491
00492
00493
00494
00495 if (sdata->u.ibss.fixed_bssid)
00496 goto put_bss;
00497
00498
00499 if (!(cbss->capability & WLAN_CAPABILITY_IBSS))
00500 goto put_bss;
00501
00502
00503 if (cbss->channel != local->oper_channel)
00504 goto put_bss;
00505
00506
00507 if (elems->ssid_len != sdata->u.ibss.ssid_len ||
00508 memcmp(elems->ssid, sdata->u.ibss.ssid,
00509 sdata->u.ibss.ssid_len))
00510 goto put_bss;
00511
00512
00513 if (ether_addr_equal(cbss->bssid, sdata->u.ibss.bssid))
00514 goto put_bss;
00515
00516 if (rx_status->flag & RX_FLAG_MACTIME_MPDU) {
00517
00518
00519
00520
00521
00522
00523
00524
00525
00526
00527
00528
00529
00530
00531 int rate;
00532
00533 if (rx_status->flag & RX_FLAG_HT)
00534 rate = 65;
00535 else
00536 rate = local->hw.wiphy->bands[band]->
00537 bitrates[rx_status->rate_idx].bitrate;
00538
00539 rx_timestamp = rx_status->mactime + (24 * 8 * 10 / rate);
00540 } else {
00541
00542
00543
00544
00545 rx_timestamp = drv_get_tsf(local, sdata);
00546 }
00547
00548 #ifdef CONFIG_MAC80211_IBSS_DEBUG
00549 printk(KERN_DEBUG "RX beacon SA=%pM BSSID="
00550 "%pM TSF=0x%llx BCN=0x%llx diff=%lld @%lu\n",
00551 mgmt->sa, mgmt->bssid,
00552 (unsigned long long)rx_timestamp,
00553 (unsigned long long)beacon_timestamp,
00554 (unsigned long long)(rx_timestamp - beacon_timestamp),
00555 jiffies);
00556 #endif
00557
00558 if (beacon_timestamp > rx_timestamp) {
00559 #ifdef CONFIG_MAC80211_IBSS_DEBUG
00560 printk(KERN_DEBUG "%s: beacon TSF higher than "
00561 "local TSF - IBSS merge with BSSID %pM\n",
00562 sdata->name, mgmt->bssid);
00563 #endif
00564 ieee80211_sta_join_ibss(sdata, bss);
00565 supp_rates = ieee80211_sta_get_rates(local, elems, band, NULL);
00566 ieee80211_ibss_add_sta(sdata, mgmt->bssid, mgmt->sa,
00567 supp_rates, true);
00568 rcu_read_unlock();
00569 }
00570
00571 put_bss:
00572 ieee80211_rx_bss_put(local, bss);
00573 }
00574
00575 void ieee80211_ibss_rx_no_sta(struct ieee80211_sub_if_data *sdata,
00576 const u8 *bssid, const u8 *addr,
00577 u32 supp_rates)
00578 {
00579 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
00580 struct ieee80211_local *local = sdata->local;
00581 struct sta_info *sta;
00582 int band = local->hw.conf.channel->band;
00583
00584
00585
00586
00587
00588 if (local->num_sta >= IEEE80211_IBSS_MAX_STA_ENTRIES) {
00589 net_dbg_ratelimited("%s: No room for a new IBSS STA entry %pM\n",
00590 sdata->name, addr);
00591 return;
00592 }
00593
00594 if (ifibss->state == IEEE80211_IBSS_MLME_SEARCH)
00595 return;
00596
00597 if (!ether_addr_equal(bssid, sdata->u.ibss.bssid))
00598 return;
00599
00600 sta = sta_info_alloc(sdata, addr, GFP_ATOMIC);
00601 if (!sta)
00602 return;
00603
00604 sta->last_rx = jiffies;
00605
00606
00607 sta->sta.supp_rates[band] = supp_rates |
00608 ieee80211_mandatory_rates(local, band);
00609
00610 spin_lock(&ifibss->incomplete_lock);
00611 list_add(&sta->list, &ifibss->incomplete_stations);
00612 spin_unlock(&ifibss->incomplete_lock);
00613 ieee80211_queue_work(&local->hw, &sdata->work);
00614 }
00615
00616 static int ieee80211_sta_active_ibss(struct ieee80211_sub_if_data *sdata)
00617 {
00618 struct ieee80211_local *local = sdata->local;
00619 int active = 0;
00620 struct sta_info *sta;
00621
00622 lockdep_assert_held(&sdata->u.ibss.mtx);
00623
00624 rcu_read_lock();
00625
00626 list_for_each_entry_rcu(sta, &local->sta_list, list) {
00627 if (sta->sdata == sdata &&
00628 time_after(sta->last_rx + IEEE80211_IBSS_MERGE_INTERVAL,
00629 jiffies)) {
00630 active++;
00631 break;
00632 }
00633 }
00634
00635 rcu_read_unlock();
00636
00637 return active;
00638 }
00639
00640
00641
00642
00643
00644 static void ieee80211_sta_merge_ibss(struct ieee80211_sub_if_data *sdata)
00645 {
00646 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
00647
00648 lockdep_assert_held(&ifibss->mtx);
00649
00650 mod_timer(&ifibss->timer,
00651 round_jiffies(jiffies + IEEE80211_IBSS_MERGE_INTERVAL));
00652
00653 ieee80211_sta_expire(sdata, IEEE80211_IBSS_INACTIVITY_LIMIT);
00654
00655 if (time_before(jiffies, ifibss->last_scan_completed +
00656 IEEE80211_IBSS_MERGE_INTERVAL))
00657 return;
00658
00659 if (ieee80211_sta_active_ibss(sdata))
00660 return;
00661
00662 if (ifibss->fixed_channel)
00663 return;
00664
00665 printk(KERN_DEBUG "%s: No active IBSS STAs - trying to scan for other "
00666 "IBSS networks with same SSID (merge)\n", sdata->name);
00667
00668 ieee80211_request_internal_scan(sdata,
00669 ifibss->ssid, ifibss->ssid_len, NULL);
00670 }
00671
00672 static void ieee80211_sta_create_ibss(struct ieee80211_sub_if_data *sdata)
00673 {
00674 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
00675 u8 bssid[ETH_ALEN];
00676 u16 capability;
00677 int i;
00678
00679 lockdep_assert_held(&ifibss->mtx);
00680
00681 if (ifibss->fixed_bssid) {
00682 memcpy(bssid, ifibss->bssid, ETH_ALEN);
00683 } else {
00684
00685
00686
00687 get_random_bytes(bssid, ETH_ALEN);
00688 for (i = 0; i < ETH_ALEN; i++)
00689 bssid[i] ^= sdata->vif.addr[i];
00690 bssid[0] &= ~0x01;
00691 bssid[0] |= 0x02;
00692 }
00693
00694 printk(KERN_DEBUG "%s: Creating new IBSS network, BSSID %pM\n",
00695 sdata->name, bssid);
00696
00697 capability = WLAN_CAPABILITY_IBSS;
00698
00699 if (ifibss->privacy)
00700 capability |= WLAN_CAPABILITY_PRIVACY;
00701 else
00702 sdata->drop_unencrypted = 0;
00703
00704 __ieee80211_sta_join_ibss(sdata, bssid, sdata->vif.bss_conf.beacon_int,
00705 ifibss->channel, ifibss->basic_rates,
00706 capability, 0);
00707 }
00708
00709
00710
00711
00712
00713 static void ieee80211_sta_find_ibss(struct ieee80211_sub_if_data *sdata)
00714 {
00715 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
00716 struct ieee80211_local *local = sdata->local;
00717 struct cfg80211_bss *cbss;
00718 struct ieee80211_channel *chan = NULL;
00719 const u8 *bssid = NULL;
00720 int active_ibss;
00721 u16 capability;
00722
00723 lockdep_assert_held(&ifibss->mtx);
00724
00725 active_ibss = ieee80211_sta_active_ibss(sdata);
00726 #ifdef CONFIG_MAC80211_IBSS_DEBUG
00727 printk(KERN_DEBUG "%s: sta_find_ibss (active_ibss=%d)\n",
00728 sdata->name, active_ibss);
00729 #endif
00730
00731 if (active_ibss)
00732 return;
00733
00734 capability = WLAN_CAPABILITY_IBSS;
00735 if (ifibss->privacy)
00736 capability |= WLAN_CAPABILITY_PRIVACY;
00737 if (ifibss->fixed_bssid)
00738 bssid = ifibss->bssid;
00739 if (ifibss->fixed_channel)
00740 chan = ifibss->channel;
00741 if (!is_zero_ether_addr(ifibss->bssid))
00742 bssid = ifibss->bssid;
00743 cbss = cfg80211_get_bss(local->hw.wiphy, chan, bssid,
00744 ifibss->ssid, ifibss->ssid_len,
00745 WLAN_CAPABILITY_IBSS | WLAN_CAPABILITY_PRIVACY,
00746 capability);
00747
00748 if (cbss) {
00749 struct ieee80211_bss *bss;
00750
00751 bss = (void *)cbss->priv;
00752 #ifdef CONFIG_MAC80211_IBSS_DEBUG
00753 printk(KERN_DEBUG " sta_find_ibss: selected %pM current "
00754 "%pM\n", cbss->bssid, ifibss->bssid);
00755 #endif
00756
00757 printk(KERN_DEBUG "%s: Selected IBSS BSSID %pM"
00758 " based on configured SSID\n",
00759 sdata->name, cbss->bssid);
00760
00761 ieee80211_sta_join_ibss(sdata, bss);
00762 ieee80211_rx_bss_put(local, bss);
00763 return;
00764 }
00765
00766 #ifdef CONFIG_MAC80211_IBSS_DEBUG
00767 printk(KERN_DEBUG " did not try to join ibss\n");
00768 #endif
00769
00770
00771 if (time_after(jiffies, ifibss->last_scan_completed +
00772 IEEE80211_SCAN_INTERVAL)) {
00773 printk(KERN_DEBUG "%s: Trigger new scan to find an IBSS to "
00774 "join\n", sdata->name);
00775
00776 ieee80211_request_internal_scan(sdata,
00777 ifibss->ssid, ifibss->ssid_len,
00778 ifibss->fixed_channel ? ifibss->channel : NULL);
00779 } else {
00780 int interval = IEEE80211_SCAN_INTERVAL;
00781
00782 if (time_after(jiffies, ifibss->ibss_join_req +
00783 IEEE80211_IBSS_JOIN_TIMEOUT)) {
00784 if (!(local->oper_channel->flags & IEEE80211_CHAN_NO_IBSS)) {
00785 ieee80211_sta_create_ibss(sdata);
00786 return;
00787 }
00788 printk(KERN_DEBUG "%s: IBSS not allowed on"
00789 " %d MHz\n", sdata->name,
00790 local->hw.conf.channel->center_freq);
00791
00792
00793
00794 interval = IEEE80211_SCAN_INTERVAL_SLOW;
00795 }
00796
00797 mod_timer(&ifibss->timer,
00798 round_jiffies(jiffies + interval));
00799 }
00800 }
00801
00802 static void ieee80211_rx_mgmt_probe_req(struct ieee80211_sub_if_data *sdata,
00803 struct sk_buff *req)
00804 {
00805 struct ieee80211_mgmt *mgmt = (void *)req->data;
00806 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
00807 struct ieee80211_local *local = sdata->local;
00808 int tx_last_beacon, len = req->len;
00809 struct sk_buff *skb;
00810 struct ieee80211_mgmt *resp;
00811 struct sk_buff *presp;
00812 u8 *pos, *end;
00813
00814 lockdep_assert_held(&ifibss->mtx);
00815
00816 presp = rcu_dereference_protected(ifibss->presp,
00817 lockdep_is_held(&ifibss->mtx));
00818
00819 if (ifibss->state != IEEE80211_IBSS_MLME_JOINED ||
00820 len < 24 + 2 || !presp)
00821 return;
00822
00823 tx_last_beacon = drv_tx_last_beacon(local);
00824
00825 #ifdef CONFIG_MAC80211_IBSS_DEBUG
00826 printk(KERN_DEBUG "%s: RX ProbeReq SA=%pM DA=%pM BSSID=%pM"
00827 " (tx_last_beacon=%d)\n",
00828 sdata->name, mgmt->sa, mgmt->da,
00829 mgmt->bssid, tx_last_beacon);
00830 #endif
00831
00832 if (!tx_last_beacon && is_multicast_ether_addr(mgmt->da))
00833 return;
00834
00835 if (!ether_addr_equal(mgmt->bssid, ifibss->bssid) &&
00836 !is_broadcast_ether_addr(mgmt->bssid))
00837 return;
00838
00839 end = ((u8 *) mgmt) + len;
00840 pos = mgmt->u.probe_req.variable;
00841 if (pos[0] != WLAN_EID_SSID ||
00842 pos + 2 + pos[1] > end) {
00843 #ifdef CONFIG_MAC80211_IBSS_DEBUG
00844 printk(KERN_DEBUG "%s: Invalid SSID IE in ProbeReq "
00845 "from %pM\n",
00846 sdata->name, mgmt->sa);
00847 #endif
00848 return;
00849 }
00850 if (pos[1] != 0 &&
00851 (pos[1] != ifibss->ssid_len ||
00852 memcmp(pos + 2, ifibss->ssid, ifibss->ssid_len))) {
00853
00854 return;
00855 }
00856
00857
00858 skb = skb_copy(presp, GFP_KERNEL);
00859 if (!skb)
00860 return;
00861
00862 resp = (struct ieee80211_mgmt *) skb->data;
00863 memcpy(resp->da, mgmt->sa, ETH_ALEN);
00864 #ifdef CONFIG_MAC80211_IBSS_DEBUG
00865 printk(KERN_DEBUG "%s: Sending ProbeResp to %pM\n",
00866 sdata->name, resp->da);
00867 #endif
00868 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
00869 ieee80211_tx_skb(sdata, skb);
00870 }
00871
00872 static void ieee80211_rx_mgmt_probe_resp(struct ieee80211_sub_if_data *sdata,
00873 struct ieee80211_mgmt *mgmt,
00874 size_t len,
00875 struct ieee80211_rx_status *rx_status)
00876 {
00877 size_t baselen;
00878 struct ieee802_11_elems elems;
00879
00880 baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt;
00881 if (baselen > len)
00882 return;
00883
00884 ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen,
00885 &elems);
00886
00887 ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems, false);
00888 }
00889
00890 static void ieee80211_rx_mgmt_beacon(struct ieee80211_sub_if_data *sdata,
00891 struct ieee80211_mgmt *mgmt,
00892 size_t len,
00893 struct ieee80211_rx_status *rx_status)
00894 {
00895 size_t baselen;
00896 struct ieee802_11_elems elems;
00897
00898
00899 baselen = (u8 *) mgmt->u.beacon.variable - (u8 *) mgmt;
00900 if (baselen > len)
00901 return;
00902
00903 ieee802_11_parse_elems(mgmt->u.beacon.variable, len - baselen, &elems);
00904
00905 ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems, true);
00906 }
00907
00908 void ieee80211_ibss_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata,
00909 struct sk_buff *skb)
00910 {
00911 struct ieee80211_rx_status *rx_status;
00912 struct ieee80211_mgmt *mgmt;
00913 u16 fc;
00914
00915 rx_status = IEEE80211_SKB_RXCB(skb);
00916 mgmt = (struct ieee80211_mgmt *) skb->data;
00917 fc = le16_to_cpu(mgmt->frame_control);
00918
00919 mutex_lock(&sdata->u.ibss.mtx);
00920
00921 if (!sdata->u.ibss.ssid_len)
00922 goto mgmt_out;
00923
00924 switch (fc & IEEE80211_FCTL_STYPE) {
00925 case IEEE80211_STYPE_PROBE_REQ:
00926 ieee80211_rx_mgmt_probe_req(sdata, skb);
00927 break;
00928 case IEEE80211_STYPE_PROBE_RESP:
00929 ieee80211_rx_mgmt_probe_resp(sdata, mgmt, skb->len,
00930 rx_status);
00931 break;
00932 case IEEE80211_STYPE_BEACON:
00933 ieee80211_rx_mgmt_beacon(sdata, mgmt, skb->len,
00934 rx_status);
00935 break;
00936 case IEEE80211_STYPE_AUTH:
00937 ieee80211_rx_mgmt_auth_ibss(sdata, mgmt, skb->len);
00938 break;
00939 }
00940
00941 mgmt_out:
00942 mutex_unlock(&sdata->u.ibss.mtx);
00943 }
00944
00945 void ieee80211_ibss_work(struct ieee80211_sub_if_data *sdata)
00946 {
00947 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
00948 struct sta_info *sta;
00949
00950 mutex_lock(&ifibss->mtx);
00951
00952
00953
00954
00955
00956
00957 if (!ifibss->ssid_len)
00958 goto out;
00959
00960 spin_lock_bh(&ifibss->incomplete_lock);
00961 while (!list_empty(&ifibss->incomplete_stations)) {
00962 sta = list_first_entry(&ifibss->incomplete_stations,
00963 struct sta_info, list);
00964 list_del(&sta->list);
00965 spin_unlock_bh(&ifibss->incomplete_lock);
00966
00967 ieee80211_ibss_finish_sta(sta, true);
00968 rcu_read_unlock();
00969 spin_lock_bh(&ifibss->incomplete_lock);
00970 }
00971 spin_unlock_bh(&ifibss->incomplete_lock);
00972
00973 switch (ifibss->state) {
00974 case IEEE80211_IBSS_MLME_SEARCH:
00975 ieee80211_sta_find_ibss(sdata);
00976 break;
00977 case IEEE80211_IBSS_MLME_JOINED:
00978 ieee80211_sta_merge_ibss(sdata);
00979 break;
00980 default:
00981 WARN_ON(1);
00982 break;
00983 }
00984
00985 out:
00986 mutex_unlock(&ifibss->mtx);
00987 }
00988
00989 static void ieee80211_ibss_timer(unsigned long data)
00990 {
00991 struct ieee80211_sub_if_data *sdata =
00992 (struct ieee80211_sub_if_data *) data;
00993 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
00994 struct ieee80211_local *local = sdata->local;
00995
00996 if (local->quiescing) {
00997 ifibss->timer_running = true;
00998 return;
00999 }
01000
01001 ieee80211_queue_work(&local->hw, &sdata->work);
01002 }
01003
01004 #ifdef CONFIG_PM
01005 void ieee80211_ibss_quiesce(struct ieee80211_sub_if_data *sdata)
01006 {
01007 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
01008
01009 if (del_timer_sync(&ifibss->timer))
01010 ifibss->timer_running = true;
01011 }
01012
01013 void ieee80211_ibss_restart(struct ieee80211_sub_if_data *sdata)
01014 {
01015 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
01016
01017 if (ifibss->timer_running) {
01018 add_timer(&ifibss->timer);
01019 ifibss->timer_running = false;
01020 }
01021 }
01022 #endif
01023
01024 void ieee80211_ibss_setup_sdata(struct ieee80211_sub_if_data *sdata)
01025 {
01026 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
01027
01028 setup_timer(&ifibss->timer, ieee80211_ibss_timer,
01029 (unsigned long) sdata);
01030 mutex_init(&ifibss->mtx);
01031 INIT_LIST_HEAD(&ifibss->incomplete_stations);
01032 spin_lock_init(&ifibss->incomplete_lock);
01033 }
01034
01035
01036 void ieee80211_ibss_notify_scan_completed(struct ieee80211_local *local)
01037 {
01038 struct ieee80211_sub_if_data *sdata;
01039
01040 mutex_lock(&local->iflist_mtx);
01041 list_for_each_entry(sdata, &local->interfaces, list) {
01042 if (!ieee80211_sdata_running(sdata))
01043 continue;
01044 if (sdata->vif.type != NL80211_IFTYPE_ADHOC)
01045 continue;
01046 sdata->u.ibss.last_scan_completed = jiffies;
01047 ieee80211_queue_work(&local->hw, &sdata->work);
01048 }
01049 mutex_unlock(&local->iflist_mtx);
01050 }
01051
01052 int ieee80211_ibss_join(struct ieee80211_sub_if_data *sdata,
01053 struct cfg80211_ibss_params *params)
01054 {
01055 struct sk_buff *skb;
01056 u32 changed = 0;
01057
01058 skb = dev_alloc_skb(sdata->local->hw.extra_tx_headroom +
01059 sizeof(struct ieee80211_hdr_3addr) +
01060 12 +
01061 2 + IEEE80211_MAX_SSID_LEN +
01062 2 + 8 +
01063 3 +
01064 4 +
01065 2 + (IEEE80211_MAX_SUPP_RATES - 8) +
01066 2 + sizeof(struct ieee80211_ht_cap) +
01067 2 + sizeof(struct ieee80211_ht_operation) +
01068 params->ie_len);
01069 if (!skb)
01070 return -ENOMEM;
01071
01072 mutex_lock(&sdata->u.ibss.mtx);
01073
01074 if (params->bssid) {
01075 memcpy(sdata->u.ibss.bssid, params->bssid, ETH_ALEN);
01076 sdata->u.ibss.fixed_bssid = true;
01077 } else
01078 sdata->u.ibss.fixed_bssid = false;
01079
01080 sdata->u.ibss.privacy = params->privacy;
01081 sdata->u.ibss.control_port = params->control_port;
01082 sdata->u.ibss.basic_rates = params->basic_rates;
01083 memcpy(sdata->vif.bss_conf.mcast_rate, params->mcast_rate,
01084 sizeof(params->mcast_rate));
01085
01086 sdata->vif.bss_conf.beacon_int = params->beacon_interval;
01087
01088 sdata->u.ibss.channel = params->channel;
01089 sdata->u.ibss.channel_type = params->channel_type;
01090 sdata->u.ibss.fixed_channel = params->channel_fixed;
01091
01092
01093 if (params->channel_fixed) {
01094 sdata->local->oper_channel = params->channel;
01095 if (!ieee80211_set_channel_type(sdata->local, sdata,
01096 params->channel_type)) {
01097 mutex_unlock(&sdata->u.ibss.mtx);
01098 kfree_skb(skb);
01099 return -EINVAL;
01100 }
01101 }
01102
01103 if (params->ie) {
01104 sdata->u.ibss.ie = kmemdup(params->ie, params->ie_len,
01105 GFP_KERNEL);
01106 if (sdata->u.ibss.ie)
01107 sdata->u.ibss.ie_len = params->ie_len;
01108 }
01109
01110 sdata->u.ibss.skb = skb;
01111 sdata->u.ibss.state = IEEE80211_IBSS_MLME_SEARCH;
01112 sdata->u.ibss.ibss_join_req = jiffies;
01113
01114 memcpy(sdata->u.ibss.ssid, params->ssid, IEEE80211_MAX_SSID_LEN);
01115 sdata->u.ibss.ssid_len = params->ssid_len;
01116
01117 mutex_unlock(&sdata->u.ibss.mtx);
01118
01119 mutex_lock(&sdata->local->mtx);
01120 ieee80211_recalc_idle(sdata->local);
01121 mutex_unlock(&sdata->local->mtx);
01122
01123
01124
01125
01126
01127
01128
01129
01130
01131
01132
01133 sdata->vif.bss_conf.ht_operation_mode |=
01134 IEEE80211_HT_OP_MODE_PROTECTION_NONHT_MIXED
01135 | IEEE80211_HT_PARAM_RIFS_MODE;
01136
01137 changed |= BSS_CHANGED_HT;
01138 ieee80211_bss_info_change_notify(sdata, changed);
01139
01140 ieee80211_queue_work(&sdata->local->hw, &sdata->work);
01141
01142 return 0;
01143 }
01144
01145 int ieee80211_ibss_leave(struct ieee80211_sub_if_data *sdata)
01146 {
01147 struct sk_buff *skb;
01148 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
01149 struct ieee80211_local *local = sdata->local;
01150 struct cfg80211_bss *cbss;
01151 u16 capability;
01152 int active_ibss;
01153 struct sta_info *sta;
01154
01155 mutex_lock(&sdata->u.ibss.mtx);
01156
01157 sdata->u.ibss.state = IEEE80211_IBSS_MLME_SEARCH;
01158 memset(sdata->u.ibss.bssid, 0, ETH_ALEN);
01159 sdata->u.ibss.ssid_len = 0;
01160
01161 active_ibss = ieee80211_sta_active_ibss(sdata);
01162
01163 if (!active_ibss && !is_zero_ether_addr(ifibss->bssid)) {
01164 capability = WLAN_CAPABILITY_IBSS;
01165
01166 if (ifibss->privacy)
01167 capability |= WLAN_CAPABILITY_PRIVACY;
01168
01169 cbss = cfg80211_get_bss(local->hw.wiphy, ifibss->channel,
01170 ifibss->bssid, ifibss->ssid,
01171 ifibss->ssid_len, WLAN_CAPABILITY_IBSS |
01172 WLAN_CAPABILITY_PRIVACY,
01173 capability);
01174
01175 if (cbss) {
01176 cfg80211_unlink_bss(local->hw.wiphy, cbss);
01177 cfg80211_put_bss(cbss);
01178 }
01179 }
01180
01181 sta_info_flush(sdata->local, sdata);
01182
01183 spin_lock_bh(&ifibss->incomplete_lock);
01184 while (!list_empty(&ifibss->incomplete_stations)) {
01185 sta = list_first_entry(&ifibss->incomplete_stations,
01186 struct sta_info, list);
01187 list_del(&sta->list);
01188 spin_unlock_bh(&ifibss->incomplete_lock);
01189
01190 sta_info_free(local, sta);
01191 spin_lock_bh(&ifibss->incomplete_lock);
01192 }
01193 spin_unlock_bh(&ifibss->incomplete_lock);
01194
01195 netif_carrier_off(sdata->dev);
01196
01197
01198 kfree(sdata->u.ibss.ie);
01199 skb = rcu_dereference_protected(sdata->u.ibss.presp,
01200 lockdep_is_held(&sdata->u.ibss.mtx));
01201 RCU_INIT_POINTER(sdata->u.ibss.presp, NULL);
01202 sdata->vif.bss_conf.ibss_joined = false;
01203 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BEACON_ENABLED |
01204 BSS_CHANGED_IBSS);
01205 synchronize_rcu();
01206 kfree_skb(skb);
01207
01208 skb_queue_purge(&sdata->skb_queue);
01209
01210 del_timer_sync(&sdata->u.ibss.timer);
01211
01212 mutex_unlock(&sdata->u.ibss.mtx);
01213
01214 mutex_lock(&local->mtx);
01215 ieee80211_recalc_idle(sdata->local);
01216 mutex_unlock(&local->mtx);
01217
01218 return 0;
01219 }