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Viewing changes to updates/cw-3.6/net/mac80211/ibss.c

  • Committer: Package Import Robot
  • Author(s): Leann Ogasawara
  • Date: 2012-10-10 22:28:55 UTC
  • Revision ID: package-import@ubuntu.com-20121010222855-qepocc61xktv6gs9
Tags: 3.5.0-17.1
https://launchpad.net/bugs/1066123
* Open Quantal LBM
* Add compat-wireless 3.6
  -LP: #1066123

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updates/cw-3.6/net/mac80211/ibss.c
 
1
/*
 
2
 * IBSS mode implementation
 
3
 * Copyright 2003-2008, Jouni Malinen <j@w1.fi>
 
4
 * Copyright 2004, Instant802 Networks, Inc.
 
5
 * Copyright 2005, Devicescape Software, Inc.
 
6
 * Copyright 2006-2007  Jiri Benc <jbenc@suse.cz>
 
7
 * Copyright 2007, Michael Wu <flamingice@sourmilk.net>
 
8
 * Copyright 2009, Johannes Berg <johannes@sipsolutions.net>
 
9
 *
 
10
 * This program is free software; you can redistribute it and/or modify
 
11
 * it under the terms of the GNU General Public License version 2 as
 
12
 * published by the Free Software Foundation.
 
13
 */
 
14
 
 
15
#include <linux/delay.h>
 
16
#include <linux/slab.h>
 
17
#include <linux/if_ether.h>
 
18
#include <linux/skbuff.h>
 
19
#include <linux/if_arp.h>
 
20
#include <linux/etherdevice.h>
 
21
#include <linux/rtnetlink.h>
 
22
#include <net/mac80211.h>
 
23
 
 
24
#include "ieee80211_i.h"
 
25
#include "driver-ops.h"
 
26
#include "rate.h"
 
27
 
 
28
#define IEEE80211_SCAN_INTERVAL (2 * HZ)
 
29
#define IEEE80211_SCAN_INTERVAL_SLOW (15 * HZ)
 
30
#define IEEE80211_IBSS_JOIN_TIMEOUT (7 * HZ)
 
31
 
 
32
#define IEEE80211_IBSS_MERGE_INTERVAL (30 * HZ)
 
33
#define IEEE80211_IBSS_INACTIVITY_LIMIT (60 * HZ)
 
34
 
 
35
#define IEEE80211_IBSS_MAX_STA_ENTRIES 128
 
36
 
 
37
 
 
38
static void __ieee80211_sta_join_ibss(struct ieee80211_sub_if_data *sdata,
 
39
                                      const u8 *bssid, const int beacon_int,
 
40
                                      struct ieee80211_channel *chan,
 
41
                                      const u32 basic_rates,
 
42
                                      const u16 capability, u64 tsf)
 
43
{
 
44
        struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
 
45
        struct ieee80211_local *local = sdata->local;
 
46
        int rates, i;
 
47
        struct sk_buff *skb;
 
48
        struct ieee80211_mgmt *mgmt;
 
49
        u8 *pos;
 
50
        struct ieee80211_supported_band *sband;
 
51
        struct cfg80211_bss *bss;
 
52
        u32 bss_change;
 
53
        u8 supp_rates[IEEE80211_MAX_SUPP_RATES];
 
54
        enum nl80211_channel_type channel_type;
 
55
 
 
56
        lockdep_assert_held(&ifibss->mtx);
 
57
 
 
58
        /* Reset own TSF to allow time synchronization work. */
 
59
        drv_reset_tsf(local, sdata);
 
60
 
 
61
        skb = ifibss->skb;
 
62
        RCU_INIT_POINTER(ifibss->presp, NULL);
 
63
        synchronize_rcu();
 
64
        skb->data = skb->head;
 
65
        skb->len = 0;
 
66
        skb_reset_tail_pointer(skb);
 
67
        skb_reserve(skb, sdata->local->hw.extra_tx_headroom);
 
68
 
 
69
        if (!ether_addr_equal(ifibss->bssid, bssid))
 
70
                sta_info_flush(sdata->local, sdata);
 
71
 
 
72
        /* if merging, indicate to driver that we leave the old IBSS */
 
73
        if (sdata->vif.bss_conf.ibss_joined) {
 
74
                sdata->vif.bss_conf.ibss_joined = false;
 
75
                netif_carrier_off(sdata->dev);
 
76
                ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_IBSS);
 
77
        }
 
78
 
 
79
        memcpy(ifibss->bssid, bssid, ETH_ALEN);
 
80
 
 
81
        sdata->drop_unencrypted = capability & WLAN_CAPABILITY_PRIVACY ? 1 : 0;
 
82
 
 
83
        local->oper_channel = chan;
 
84
        channel_type = ifibss->channel_type;
 
85
        if (!cfg80211_can_beacon_sec_chan(local->hw.wiphy, chan, channel_type))
 
86
                channel_type = NL80211_CHAN_HT20;
 
87
        if (!ieee80211_set_channel_type(local, sdata, channel_type)) {
 
88
                /* can only fail due to HT40+/- mismatch */
 
89
                channel_type = NL80211_CHAN_HT20;
 
90
                WARN_ON(!ieee80211_set_channel_type(local, sdata,
 
91
                                                    NL80211_CHAN_HT20));
 
92
        }
 
93
        ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_CHANNEL);
 
94
 
 
95
        sband = local->hw.wiphy->bands[chan->band];
 
96
 
 
97
        /* build supported rates array */
 
98
        pos = supp_rates;
 
99
        for (i = 0; i < sband->n_bitrates; i++) {
 
100
                int rate = sband->bitrates[i].bitrate;
 
101
                u8 basic = 0;
 
102
                if (basic_rates & BIT(i))
 
103
                        basic = 0x80;
 
104
                *pos++ = basic | (u8) (rate / 5);
 
105
        }
 
106
 
 
107
        /* Build IBSS probe response */
 
108
        mgmt = (void *) skb_put(skb, 24 + sizeof(mgmt->u.beacon));
 
109
        memset(mgmt, 0, 24 + sizeof(mgmt->u.beacon));
 
110
        mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
 
111
                                          IEEE80211_STYPE_PROBE_RESP);
 
112
        memset(mgmt->da, 0xff, ETH_ALEN);
 
113
        memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
 
114
        memcpy(mgmt->bssid, ifibss->bssid, ETH_ALEN);
 
115
        mgmt->u.beacon.beacon_int = cpu_to_le16(beacon_int);
 
116
        mgmt->u.beacon.timestamp = cpu_to_le64(tsf);
 
117
        mgmt->u.beacon.capab_info = cpu_to_le16(capability);
 
118
 
 
119
        pos = skb_put(skb, 2 + ifibss->ssid_len);
 
120
        *pos++ = WLAN_EID_SSID;
 
121
        *pos++ = ifibss->ssid_len;
 
122
        memcpy(pos, ifibss->ssid, ifibss->ssid_len);
 
123
 
 
124
        rates = sband->n_bitrates;
 
125
        if (rates > 8)
 
126
                rates = 8;
 
127
        pos = skb_put(skb, 2 + rates);
 
128
        *pos++ = WLAN_EID_SUPP_RATES;
 
129
        *pos++ = rates;
 
130
        memcpy(pos, supp_rates, rates);
 
131
 
 
132
        if (sband->band == IEEE80211_BAND_2GHZ) {
 
133
                pos = skb_put(skb, 2 + 1);
 
134
                *pos++ = WLAN_EID_DS_PARAMS;
 
135
                *pos++ = 1;
 
136
                *pos++ = ieee80211_frequency_to_channel(chan->center_freq);
 
137
        }
 
138
 
 
139
        pos = skb_put(skb, 2 + 2);
 
140
        *pos++ = WLAN_EID_IBSS_PARAMS;
 
141
        *pos++ = 2;
 
142
        /* FIX: set ATIM window based on scan results */
 
143
        *pos++ = 0;
 
144
        *pos++ = 0;
 
145
 
 
146
        if (sband->n_bitrates > 8) {
 
147
                rates = sband->n_bitrates - 8;
 
148
                pos = skb_put(skb, 2 + rates);
 
149
                *pos++ = WLAN_EID_EXT_SUPP_RATES;
 
150
                *pos++ = rates;
 
151
                memcpy(pos, &supp_rates[8], rates);
 
152
        }
 
153
 
 
154
        if (ifibss->ie_len)
 
155
                memcpy(skb_put(skb, ifibss->ie_len),
 
156
                       ifibss->ie, ifibss->ie_len);
 
157
 
 
158
        /* add HT capability and information IEs */
 
159
        if (channel_type && sband->ht_cap.ht_supported) {
 
160
                pos = skb_put(skb, 4 +
 
161
                                   sizeof(struct ieee80211_ht_cap) +
 
162
                                   sizeof(struct ieee80211_ht_operation));
 
163
                pos = ieee80211_ie_build_ht_cap(pos, &sband->ht_cap,
 
164
                                                sband->ht_cap.cap);
 
165
                /*
 
166
                 * Note: According to 802.11n-2009 9.13.3.1, HT Protection
 
167
                 * field and RIFS Mode are reserved in IBSS mode, therefore
 
168
                 * keep them at 0
 
169
                 */
 
170
                pos = ieee80211_ie_build_ht_oper(pos, &sband->ht_cap,
 
171
                                                 chan, channel_type, 0);
 
172
        }
 
173
 
 
174
        if (local->hw.queues >= IEEE80211_NUM_ACS) {
 
175
                pos = skb_put(skb, 9);
 
176
                *pos++ = WLAN_EID_VENDOR_SPECIFIC;
 
177
                *pos++ = 7; /* len */
 
178
                *pos++ = 0x00; /* Microsoft OUI 00:50:F2 */
 
179
                *pos++ = 0x50;
 
180
                *pos++ = 0xf2;
 
181
                *pos++ = 2; /* WME */
 
182
                *pos++ = 0; /* WME info */
 
183
                *pos++ = 1; /* WME ver */
 
184
                *pos++ = 0; /* U-APSD no in use */
 
185
        }
 
186
 
 
187
        rcu_assign_pointer(ifibss->presp, skb);
 
188
 
 
189
        sdata->vif.bss_conf.beacon_int = beacon_int;
 
190
        sdata->vif.bss_conf.basic_rates = basic_rates;
 
191
        bss_change = BSS_CHANGED_BEACON_INT;
 
192
        bss_change |= ieee80211_reset_erp_info(sdata);
 
193
        bss_change |= BSS_CHANGED_BSSID;
 
194
        bss_change |= BSS_CHANGED_BEACON;
 
195
        bss_change |= BSS_CHANGED_BEACON_ENABLED;
 
196
        bss_change |= BSS_CHANGED_BASIC_RATES;
 
197
        bss_change |= BSS_CHANGED_HT;
 
198
        bss_change |= BSS_CHANGED_IBSS;
 
199
        sdata->vif.bss_conf.ibss_joined = true;
 
200
        ieee80211_bss_info_change_notify(sdata, bss_change);
 
201
 
 
202
        ieee80211_sta_def_wmm_params(sdata, sband->n_bitrates, supp_rates);
 
203
 
 
204
        ifibss->state = IEEE80211_IBSS_MLME_JOINED;
 
205
        mod_timer(&ifibss->timer,
 
206
                  round_jiffies(jiffies + IEEE80211_IBSS_MERGE_INTERVAL));
 
207
 
 
208
        bss = cfg80211_inform_bss_frame(local->hw.wiphy, local->hw.conf.channel,
 
209
                                        mgmt, skb->len, 0, GFP_KERNEL);
 
210
        cfg80211_put_bss(bss);
 
211
        netif_carrier_on(sdata->dev);
 
212
        cfg80211_ibss_joined(sdata->dev, ifibss->bssid, GFP_KERNEL);
 
213
}
 
214
 
 
215
static void ieee80211_sta_join_ibss(struct ieee80211_sub_if_data *sdata,
 
216
                                    struct ieee80211_bss *bss)
 
217
{
 
218
        struct cfg80211_bss *cbss =
 
219
                container_of((void *)bss, struct cfg80211_bss, priv);
 
220
        struct ieee80211_supported_band *sband;
 
221
        u32 basic_rates;
 
222
        int i, j;
 
223
        u16 beacon_int = cbss->beacon_interval;
 
224
 
 
225
        lockdep_assert_held(&sdata->u.ibss.mtx);
 
226
 
 
227
        if (beacon_int < 10)
 
228
                beacon_int = 10;
 
229
 
 
230
        sband = sdata->local->hw.wiphy->bands[cbss->channel->band];
 
231
 
 
232
        basic_rates = 0;
 
233
 
 
234
        for (i = 0; i < bss->supp_rates_len; i++) {
 
235
                int rate = (bss->supp_rates[i] & 0x7f) * 5;
 
236
                bool is_basic = !!(bss->supp_rates[i] & 0x80);
 
237
 
 
238
                for (j = 0; j < sband->n_bitrates; j++) {
 
239
                        if (sband->bitrates[j].bitrate == rate) {
 
240
                                if (is_basic)
 
241
                                        basic_rates |= BIT(j);
 
242
                                break;
 
243
                        }
 
244
                }
 
245
        }
 
246
 
 
247
        __ieee80211_sta_join_ibss(sdata, cbss->bssid,
 
248
                                  beacon_int,
 
249
                                  cbss->channel,
 
250
                                  basic_rates,
 
251
                                  cbss->capability,
 
252
                                  cbss->tsf);
 
253
}
 
254
 
 
255
static struct sta_info *ieee80211_ibss_finish_sta(struct sta_info *sta,
 
256
                                                  bool auth)
 
257
        __acquires(RCU)
 
258
{
 
259
        struct ieee80211_sub_if_data *sdata = sta->sdata;
 
260
        u8 addr[ETH_ALEN];
 
261
 
 
262
        memcpy(addr, sta->sta.addr, ETH_ALEN);
 
263
 
 
264
        ibss_dbg(sdata, "Adding new IBSS station %pM\n", addr);
 
265
 
 
266
        sta_info_pre_move_state(sta, IEEE80211_STA_AUTH);
 
267
        sta_info_pre_move_state(sta, IEEE80211_STA_ASSOC);
 
268
        /* authorize the station only if the network is not RSN protected. If
 
269
         * not wait for the userspace to authorize it */
 
270
        if (!sta->sdata->u.ibss.control_port)
 
271
                sta_info_pre_move_state(sta, IEEE80211_STA_AUTHORIZED);
 
272
 
 
273
        rate_control_rate_init(sta);
 
274
 
 
275
        /* If it fails, maybe we raced another insertion? */
 
276
        if (sta_info_insert_rcu(sta))
 
277
                return sta_info_get(sdata, addr);
 
278
        if (auth && !sdata->u.ibss.auth_frame_registrations) {
 
279
                ibss_dbg(sdata,
 
280
                         "TX Auth SA=%pM DA=%pM BSSID=%pM (auth_transaction=1)\n",
 
281
                         sdata->vif.addr, sdata->u.ibss.bssid, addr);
 
282
                ieee80211_send_auth(sdata, 1, WLAN_AUTH_OPEN, NULL, 0,
 
283
                                    addr, sdata->u.ibss.bssid, NULL, 0, 0);
 
284
        }
 
285
        return sta;
 
286
}
 
287
 
 
288
static struct sta_info *
 
289
ieee80211_ibss_add_sta(struct ieee80211_sub_if_data *sdata,
 
290
                       const u8 *bssid, const u8 *addr,
 
291
                       u32 supp_rates, bool auth)
 
292
        __acquires(RCU)
 
293
{
 
294
        struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
 
295
        struct ieee80211_local *local = sdata->local;
 
296
        struct sta_info *sta;
 
297
        int band = local->hw.conf.channel->band;
 
298
 
 
299
        /*
 
300
         * XXX: Consider removing the least recently used entry and
 
301
         *      allow new one to be added.
 
302
         */
 
303
        if (local->num_sta >= IEEE80211_IBSS_MAX_STA_ENTRIES) {
 
304
                net_info_ratelimited("%s: No room for a new IBSS STA entry %pM\n",
 
305
                                    sdata->name, addr);
 
306
                rcu_read_lock();
 
307
                return NULL;
 
308
        }
 
309
 
 
310
        if (ifibss->state == IEEE80211_IBSS_MLME_SEARCH) {
 
311
                rcu_read_lock();
 
312
                return NULL;
 
313
        }
 
314
 
 
315
        if (!ether_addr_equal(bssid, sdata->u.ibss.bssid)) {
 
316
                rcu_read_lock();
 
317
                return NULL;
 
318
        }
 
319
 
 
320
        sta = sta_info_alloc(sdata, addr, GFP_KERNEL);
 
321
        if (!sta) {
 
322
                rcu_read_lock();
 
323
                return NULL;
 
324
        }
 
325
 
 
326
        sta->last_rx = jiffies;
 
327
 
 
328
        /* make sure mandatory rates are always added */
 
329
        sta->sta.supp_rates[band] = supp_rates |
 
330
                        ieee80211_mandatory_rates(local, band);
 
331
 
 
332
        return ieee80211_ibss_finish_sta(sta, auth);
 
333
}
 
334
 
 
335
static void ieee80211_rx_mgmt_auth_ibss(struct ieee80211_sub_if_data *sdata,
 
336
                                        struct ieee80211_mgmt *mgmt,
 
337
                                        size_t len)
 
338
{
 
339
        u16 auth_alg, auth_transaction;
 
340
 
 
341
        lockdep_assert_held(&sdata->u.ibss.mtx);
 
342
 
 
343
        if (len < 24 + 6)
 
344
                return;
 
345
 
 
346
        auth_alg = le16_to_cpu(mgmt->u.auth.auth_alg);
 
347
        auth_transaction = le16_to_cpu(mgmt->u.auth.auth_transaction);
 
348
 
 
349
        if (auth_alg != WLAN_AUTH_OPEN || auth_transaction != 1)
 
350
                return;
 
351
        ibss_dbg(sdata,
 
352
                 "RX Auth SA=%pM DA=%pM BSSID=%pM (auth_transaction=%d)\n",
 
353
                 mgmt->sa, mgmt->da, mgmt->bssid, auth_transaction);
 
354
        sta_info_destroy_addr(sdata, mgmt->sa);
 
355
        ieee80211_ibss_add_sta(sdata, mgmt->bssid, mgmt->sa, 0, false);
 
356
        rcu_read_unlock();
 
357
 
 
358
        /*
 
359
         * IEEE 802.11 standard does not require authentication in IBSS
 
360
         * networks and most implementations do not seem to use it.
 
361
         * However, try to reply to authentication attempts if someone
 
362
         * has actually implemented this.
 
363
         */
 
364
        ieee80211_send_auth(sdata, 2, WLAN_AUTH_OPEN, NULL, 0,
 
365
                            mgmt->sa, sdata->u.ibss.bssid, NULL, 0, 0);
 
366
}
 
367
 
 
368
static void ieee80211_rx_bss_info(struct ieee80211_sub_if_data *sdata,
 
369
                                  struct ieee80211_mgmt *mgmt,
 
370
                                  size_t len,
 
371
                                  struct ieee80211_rx_status *rx_status,
 
372
                                  struct ieee802_11_elems *elems,
 
373
                                  bool beacon)
 
374
{
 
375
        struct ieee80211_local *local = sdata->local;
 
376
        int freq;
 
377
        struct cfg80211_bss *cbss;
 
378
        struct ieee80211_bss *bss;
 
379
        struct sta_info *sta;
 
380
        struct ieee80211_channel *channel;
 
381
        u64 beacon_timestamp, rx_timestamp;
 
382
        u32 supp_rates = 0;
 
383
        enum ieee80211_band band = rx_status->band;
 
384
        struct ieee80211_supported_band *sband = local->hw.wiphy->bands[band];
 
385
        bool rates_updated = false;
 
386
 
 
387
        if (elems->ds_params && elems->ds_params_len == 1)
 
388
                freq = ieee80211_channel_to_frequency(elems->ds_params[0],
 
389
                                                      band);
 
390
        else
 
391
                freq = rx_status->freq;
 
392
 
 
393
        channel = ieee80211_get_channel(local->hw.wiphy, freq);
 
394
 
 
395
        if (!channel || channel->flags & IEEE80211_CHAN_DISABLED)
 
396
                return;
 
397
 
 
398
        if (sdata->vif.type == NL80211_IFTYPE_ADHOC &&
 
399
            ether_addr_equal(mgmt->bssid, sdata->u.ibss.bssid)) {
 
400
 
 
401
                rcu_read_lock();
 
402
                sta = sta_info_get(sdata, mgmt->sa);
 
403
 
 
404
                if (elems->supp_rates) {
 
405
                        supp_rates = ieee80211_sta_get_rates(local, elems,
 
406
                                                             band, NULL);
 
407
                        if (sta) {
 
408
                                u32 prev_rates;
 
409
 
 
410
                                prev_rates = sta->sta.supp_rates[band];
 
411
                                /* make sure mandatory rates are always added */
 
412
                                sta->sta.supp_rates[band] = supp_rates |
 
413
                                        ieee80211_mandatory_rates(local, band);
 
414
 
 
415
                                if (sta->sta.supp_rates[band] != prev_rates) {
 
416
                                        ibss_dbg(sdata,
 
417
                                                 "updated supp_rates set for %pM based on beacon/probe_resp (0x%x -> 0x%x)\n",
 
418
                                                 sta->sta.addr, prev_rates,
 
419
                                                 sta->sta.supp_rates[band]);
 
420
                                        rates_updated = true;
 
421
                                }
 
422
                        } else {
 
423
                                rcu_read_unlock();
 
424
                                sta = ieee80211_ibss_add_sta(sdata, mgmt->bssid,
 
425
                                                mgmt->sa, supp_rates, true);
 
426
                        }
 
427
                }
 
428
 
 
429
                if (sta && elems->wmm_info)
 
430
                        set_sta_flag(sta, WLAN_STA_WME);
 
431
 
 
432
                if (sta && elems->ht_operation && elems->ht_cap_elem &&
 
433
                    sdata->u.ibss.channel_type != NL80211_CHAN_NO_HT) {
 
434
                        /* we both use HT */
 
435
                        struct ieee80211_sta_ht_cap sta_ht_cap_new;
 
436
                        enum nl80211_channel_type channel_type =
 
437
                                ieee80211_ht_oper_to_channel_type(
 
438
                                                        elems->ht_operation);
 
439
 
 
440
                        ieee80211_ht_cap_ie_to_sta_ht_cap(sdata, sband,
 
441
                                                          elems->ht_cap_elem,
 
442
                                                          &sta_ht_cap_new);
 
443
 
 
444
                        /*
 
445
                         * fall back to HT20 if we don't use or use
 
446
                         * the other extension channel
 
447
                         */
 
448
                        if (!(channel_type == NL80211_CHAN_HT40MINUS ||
 
449
                              channel_type == NL80211_CHAN_HT40PLUS) ||
 
450
                            channel_type != sdata->u.ibss.channel_type)
 
451
                                sta_ht_cap_new.cap &=
 
452
                                        ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
 
453
 
 
454
                        if (memcmp(&sta->sta.ht_cap, &sta_ht_cap_new,
 
455
                                   sizeof(sta_ht_cap_new))) {
 
456
                                memcpy(&sta->sta.ht_cap, &sta_ht_cap_new,
 
457
                                       sizeof(sta_ht_cap_new));
 
458
                                rates_updated = true;
 
459
                        }
 
460
                }
 
461
 
 
462
                if (sta && rates_updated)
 
463
                        rate_control_rate_init(sta);
 
464
 
 
465
                rcu_read_unlock();
 
466
        }
 
467
 
 
468
        bss = ieee80211_bss_info_update(local, rx_status, mgmt, len, elems,
 
469
                                        channel, beacon);
 
470
        if (!bss)
 
471
                return;
 
472
 
 
473
        cbss = container_of((void *)bss, struct cfg80211_bss, priv);
 
474
 
 
475
        /* was just updated in ieee80211_bss_info_update */
 
476
        beacon_timestamp = cbss->tsf;
 
477
 
 
478
        /* check if we need to merge IBSS */
 
479
 
 
480
        /* we use a fixed BSSID */
 
481
        if (sdata->u.ibss.fixed_bssid)
 
482
                goto put_bss;
 
483
 
 
484
        /* not an IBSS */
 
485
        if (!(cbss->capability & WLAN_CAPABILITY_IBSS))
 
486
                goto put_bss;
 
487
 
 
488
        /* different channel */
 
489
        if (cbss->channel != local->oper_channel)
 
490
                goto put_bss;
 
491
 
 
492
        /* different SSID */
 
493
        if (elems->ssid_len != sdata->u.ibss.ssid_len ||
 
494
            memcmp(elems->ssid, sdata->u.ibss.ssid,
 
495
                                sdata->u.ibss.ssid_len))
 
496
                goto put_bss;
 
497
 
 
498
        /* same BSSID */
 
499
        if (ether_addr_equal(cbss->bssid, sdata->u.ibss.bssid))
 
500
                goto put_bss;
 
501
 
 
502
        if (rx_status->flag & RX_FLAG_MACTIME_MPDU) {
 
503
                /*
 
504
                 * For correct IBSS merging we need mactime; since mactime is
 
505
                 * defined as the time the first data symbol of the frame hits
 
506
                 * the PHY, and the timestamp of the beacon is defined as "the
 
507
                 * time that the data symbol containing the first bit of the
 
508
                 * timestamp is transmitted to the PHY plus the transmitting
 
509
                 * STA's delays through its local PHY from the MAC-PHY
 
510
                 * interface to its interface with the WM" (802.11 11.1.2)
 
511
                 * - equals the time this bit arrives at the receiver - we have
 
512
                 * to take into account the offset between the two.
 
513
                 *
 
514
                 * E.g. at 1 MBit that means mactime is 192 usec earlier
 
515
                 * (=24 bytes * 8 usecs/byte) than the beacon timestamp.
 
516
                 */
 
517
                int rate;
 
518
 
 
519
                if (rx_status->flag & RX_FLAG_HT)
 
520
                        rate = 65; /* TODO: HT rates */
 
521
                else
 
522
                        rate = local->hw.wiphy->bands[band]->
 
523
                                bitrates[rx_status->rate_idx].bitrate;
 
524
 
 
525
                rx_timestamp = rx_status->mactime + (24 * 8 * 10 / rate);
 
526
        } else {
 
527
                /*
 
528
                 * second best option: get current TSF
 
529
                 * (will return -1 if not supported)
 
530
                 */
 
531
                rx_timestamp = drv_get_tsf(local, sdata);
 
532
        }
 
533
 
 
534
        ibss_dbg(sdata,
 
535
                 "RX beacon SA=%pM BSSID=%pM TSF=0x%llx BCN=0x%llx diff=%lld @%lu\n",
 
536
                 mgmt->sa, mgmt->bssid,
 
537
                 (unsigned long long)rx_timestamp,
 
538
                 (unsigned long long)beacon_timestamp,
 
539
                 (unsigned long long)(rx_timestamp - beacon_timestamp),
 
540
                 jiffies);
 
541
 
 
542
        if (beacon_timestamp > rx_timestamp) {
 
543
                ibss_dbg(sdata,
 
544
                         "beacon TSF higher than local TSF - IBSS merge with BSSID %pM\n",
 
545
                         mgmt->bssid);
 
546
                ieee80211_sta_join_ibss(sdata, bss);
 
547
                supp_rates = ieee80211_sta_get_rates(local, elems, band, NULL);
 
548
                ieee80211_ibss_add_sta(sdata, mgmt->bssid, mgmt->sa,
 
549
                                       supp_rates, true);
 
550
                rcu_read_unlock();
 
551
        }
 
552
 
 
553
 put_bss:
 
554
        ieee80211_rx_bss_put(local, bss);
 
555
}
 
556
 
 
557
void ieee80211_ibss_rx_no_sta(struct ieee80211_sub_if_data *sdata,
 
558
                              const u8 *bssid, const u8 *addr,
 
559
                              u32 supp_rates)
 
560
{
 
561
        struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
 
562
        struct ieee80211_local *local = sdata->local;
 
563
        struct sta_info *sta;
 
564
        int band = local->hw.conf.channel->band;
 
565
 
 
566
        /*
 
567
         * XXX: Consider removing the least recently used entry and
 
568
         *      allow new one to be added.
 
569
         */
 
570
        if (local->num_sta >= IEEE80211_IBSS_MAX_STA_ENTRIES) {
 
571
                net_info_ratelimited("%s: No room for a new IBSS STA entry %pM\n",
 
572
                                    sdata->name, addr);
 
573
                return;
 
574
        }
 
575
 
 
576
        if (ifibss->state == IEEE80211_IBSS_MLME_SEARCH)
 
577
                return;
 
578
 
 
579
        if (!ether_addr_equal(bssid, sdata->u.ibss.bssid))
 
580
                return;
 
581
 
 
582
        sta = sta_info_alloc(sdata, addr, GFP_ATOMIC);
 
583
        if (!sta)
 
584
                return;
 
585
 
 
586
        sta->last_rx = jiffies;
 
587
 
 
588
        /* make sure mandatory rates are always added */
 
589
        sta->sta.supp_rates[band] = supp_rates |
 
590
                        ieee80211_mandatory_rates(local, band);
 
591
 
 
592
        spin_lock(&ifibss->incomplete_lock);
 
593
        list_add(&sta->list, &ifibss->incomplete_stations);
 
594
        spin_unlock(&ifibss->incomplete_lock);
 
595
        ieee80211_queue_work(&local->hw, &sdata->work);
 
596
}
 
597
 
 
598
static int ieee80211_sta_active_ibss(struct ieee80211_sub_if_data *sdata)
 
599
{
 
600
        struct ieee80211_local *local = sdata->local;
 
601
        int active = 0;
 
602
        struct sta_info *sta;
 
603
 
 
604
        lockdep_assert_held(&sdata->u.ibss.mtx);
 
605
 
 
606
        rcu_read_lock();
 
607
 
 
608
        list_for_each_entry_rcu(sta, &local->sta_list, list) {
 
609
                if (sta->sdata == sdata &&
 
610
                    time_after(sta->last_rx + IEEE80211_IBSS_MERGE_INTERVAL,
 
611
                               jiffies)) {
 
612
                        active++;
 
613
                        break;
 
614
                }
 
615
        }
 
616
 
 
617
        rcu_read_unlock();
 
618
 
 
619
        return active;
 
620
}
 
621
 
 
622
/*
 
623
 * This function is called with state == IEEE80211_IBSS_MLME_JOINED
 
624
 */
 
625
 
 
626
static void ieee80211_sta_merge_ibss(struct ieee80211_sub_if_data *sdata)
 
627
{
 
628
        struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
 
629
 
 
630
        lockdep_assert_held(&ifibss->mtx);
 
631
 
 
632
        mod_timer(&ifibss->timer,
 
633
                  round_jiffies(jiffies + IEEE80211_IBSS_MERGE_INTERVAL));
 
634
 
 
635
        ieee80211_sta_expire(sdata, IEEE80211_IBSS_INACTIVITY_LIMIT);
 
636
 
 
637
        if (time_before(jiffies, ifibss->last_scan_completed +
 
638
                       IEEE80211_IBSS_MERGE_INTERVAL))
 
639
                return;
 
640
 
 
641
        if (ieee80211_sta_active_ibss(sdata))
 
642
                return;
 
643
 
 
644
        if (ifibss->fixed_channel)
 
645
                return;
 
646
 
 
647
        sdata_info(sdata,
 
648
                   "No active IBSS STAs - trying to scan for other IBSS networks with same SSID (merge)\n");
 
649
 
 
650
        ieee80211_request_internal_scan(sdata,
 
651
                        ifibss->ssid, ifibss->ssid_len, NULL);
 
652
}
 
653
 
 
654
static void ieee80211_sta_create_ibss(struct ieee80211_sub_if_data *sdata)
 
655
{
 
656
        struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
 
657
        u8 bssid[ETH_ALEN];
 
658
        u16 capability;
 
659
        int i;
 
660
 
 
661
        lockdep_assert_held(&ifibss->mtx);
 
662
 
 
663
        if (ifibss->fixed_bssid) {
 
664
                memcpy(bssid, ifibss->bssid, ETH_ALEN);
 
665
        } else {
 
666
                /* Generate random, not broadcast, locally administered BSSID. Mix in
 
667
                 * own MAC address to make sure that devices that do not have proper
 
668
                 * random number generator get different BSSID. */
 
669
                get_random_bytes(bssid, ETH_ALEN);
 
670
                for (i = 0; i < ETH_ALEN; i++)
 
671
                        bssid[i] ^= sdata->vif.addr[i];
 
672
                bssid[0] &= ~0x01;
 
673
                bssid[0] |= 0x02;
 
674
        }
 
675
 
 
676
        sdata_info(sdata, "Creating new IBSS network, BSSID %pM\n", bssid);
 
677
 
 
678
        capability = WLAN_CAPABILITY_IBSS;
 
679
 
 
680
        if (ifibss->privacy)
 
681
                capability |= WLAN_CAPABILITY_PRIVACY;
 
682
        else
 
683
                sdata->drop_unencrypted = 0;
 
684
 
 
685
        __ieee80211_sta_join_ibss(sdata, bssid, sdata->vif.bss_conf.beacon_int,
 
686
                                  ifibss->channel, ifibss->basic_rates,
 
687
                                  capability, 0);
 
688
}
 
689
 
 
690
/*
 
691
 * This function is called with state == IEEE80211_IBSS_MLME_SEARCH
 
692
 */
 
693
 
 
694
static void ieee80211_sta_find_ibss(struct ieee80211_sub_if_data *sdata)
 
695
{
 
696
        struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
 
697
        struct ieee80211_local *local = sdata->local;
 
698
        struct cfg80211_bss *cbss;
 
699
        struct ieee80211_channel *chan = NULL;
 
700
        const u8 *bssid = NULL;
 
701
        int active_ibss;
 
702
        u16 capability;
 
703
 
 
704
        lockdep_assert_held(&ifibss->mtx);
 
705
 
 
706
        active_ibss = ieee80211_sta_active_ibss(sdata);
 
707
        ibss_dbg(sdata, "sta_find_ibss (active_ibss=%d)\n", active_ibss);
 
708
 
 
709
        if (active_ibss)
 
710
                return;
 
711
 
 
712
        capability = WLAN_CAPABILITY_IBSS;
 
713
        if (ifibss->privacy)
 
714
                capability |= WLAN_CAPABILITY_PRIVACY;
 
715
        if (ifibss->fixed_bssid)
 
716
                bssid = ifibss->bssid;
 
717
        if (ifibss->fixed_channel)
 
718
                chan = ifibss->channel;
 
719
        if (!is_zero_ether_addr(ifibss->bssid))
 
720
                bssid = ifibss->bssid;
 
721
        cbss = cfg80211_get_bss(local->hw.wiphy, chan, bssid,
 
722
                                ifibss->ssid, ifibss->ssid_len,
 
723
                                WLAN_CAPABILITY_IBSS | WLAN_CAPABILITY_PRIVACY,
 
724
                                capability);
 
725
 
 
726
        if (cbss) {
 
727
                struct ieee80211_bss *bss;
 
728
 
 
729
                bss = (void *)cbss->priv;
 
730
                ibss_dbg(sdata,
 
731
                         "sta_find_ibss: selected %pM current %pM\n",
 
732
                         cbss->bssid, ifibss->bssid);
 
733
                sdata_info(sdata,
 
734
                           "Selected IBSS BSSID %pM based on configured SSID\n",
 
735
                           cbss->bssid);
 
736
 
 
737
                ieee80211_sta_join_ibss(sdata, bss);
 
738
                ieee80211_rx_bss_put(local, bss);
 
739
                return;
 
740
        }
 
741
 
 
742
        ibss_dbg(sdata, "sta_find_ibss: did not try to join ibss\n");
 
743
 
 
744
        /* Selected IBSS not found in current scan results - try to scan */
 
745
        if (time_after(jiffies, ifibss->last_scan_completed +
 
746
                                        IEEE80211_SCAN_INTERVAL)) {
 
747
                sdata_info(sdata, "Trigger new scan to find an IBSS to join\n");
 
748
 
 
749
                ieee80211_request_internal_scan(sdata,
 
750
                                ifibss->ssid, ifibss->ssid_len,
 
751
                                ifibss->fixed_channel ? ifibss->channel : NULL);
 
752
        } else {
 
753
                int interval = IEEE80211_SCAN_INTERVAL;
 
754
 
 
755
                if (time_after(jiffies, ifibss->ibss_join_req +
 
756
                               IEEE80211_IBSS_JOIN_TIMEOUT)) {
 
757
                        if (!(local->oper_channel->flags & IEEE80211_CHAN_NO_IBSS)) {
 
758
                                ieee80211_sta_create_ibss(sdata);
 
759
                                return;
 
760
                        }
 
761
                        sdata_info(sdata, "IBSS not allowed on %d MHz\n",
 
762
                                   local->hw.conf.channel->center_freq);
 
763
 
 
764
                        /* No IBSS found - decrease scan interval and continue
 
765
                         * scanning. */
 
766
                        interval = IEEE80211_SCAN_INTERVAL_SLOW;
 
767
                }
 
768
 
 
769
                mod_timer(&ifibss->timer,
 
770
                          round_jiffies(jiffies + interval));
 
771
        }
 
772
}
 
773
 
 
774
static void ieee80211_rx_mgmt_probe_req(struct ieee80211_sub_if_data *sdata,
 
775
                                        struct sk_buff *req)
 
776
{
 
777
        struct ieee80211_mgmt *mgmt = (void *)req->data;
 
778
        struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
 
779
        struct ieee80211_local *local = sdata->local;
 
780
        int tx_last_beacon, len = req->len;
 
781
        struct sk_buff *skb;
 
782
        struct ieee80211_mgmt *resp;
 
783
        struct sk_buff *presp;
 
784
        u8 *pos, *end;
 
785
 
 
786
        lockdep_assert_held(&ifibss->mtx);
 
787
 
 
788
        presp = rcu_dereference_protected(ifibss->presp,
 
789
                                          lockdep_is_held(&ifibss->mtx));
 
790
 
 
791
        if (ifibss->state != IEEE80211_IBSS_MLME_JOINED ||
 
792
            len < 24 + 2 || !presp)
 
793
                return;
 
794
 
 
795
        tx_last_beacon = drv_tx_last_beacon(local);
 
796
 
 
797
        ibss_dbg(sdata,
 
798
                 "RX ProbeReq SA=%pM DA=%pM BSSID=%pM (tx_last_beacon=%d)\n",
 
799
                 mgmt->sa, mgmt->da, mgmt->bssid, tx_last_beacon);
 
800
 
 
801
        if (!tx_last_beacon && is_multicast_ether_addr(mgmt->da))
 
802
                return;
 
803
 
 
804
        if (!ether_addr_equal(mgmt->bssid, ifibss->bssid) &&
 
805
            !is_broadcast_ether_addr(mgmt->bssid))
 
806
                return;
 
807
 
 
808
        end = ((u8 *) mgmt) + len;
 
809
        pos = mgmt->u.probe_req.variable;
 
810
        if (pos[0] != WLAN_EID_SSID ||
 
811
            pos + 2 + pos[1] > end) {
 
812
                ibss_dbg(sdata, "Invalid SSID IE in ProbeReq from %pM\n",
 
813
                         mgmt->sa);
 
814
                return;
 
815
        }
 
816
        if (pos[1] != 0 &&
 
817
            (pos[1] != ifibss->ssid_len ||
 
818
             memcmp(pos + 2, ifibss->ssid, ifibss->ssid_len))) {
 
819
                /* Ignore ProbeReq for foreign SSID */
 
820
                return;
 
821
        }
 
822
 
 
823
        /* Reply with ProbeResp */
 
824
        skb = skb_copy(presp, GFP_KERNEL);
 
825
        if (!skb)
 
826
                return;
 
827
 
 
828
        resp = (struct ieee80211_mgmt *) skb->data;
 
829
        memcpy(resp->da, mgmt->sa, ETH_ALEN);
 
830
        ibss_dbg(sdata, "Sending ProbeResp to %pM\n", resp->da);
 
831
        IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
 
832
        ieee80211_tx_skb(sdata, skb);
 
833
}
 
834
 
 
835
static void ieee80211_rx_mgmt_probe_resp(struct ieee80211_sub_if_data *sdata,
 
836
                                         struct ieee80211_mgmt *mgmt,
 
837
                                         size_t len,
 
838
                                         struct ieee80211_rx_status *rx_status)
 
839
{
 
840
        size_t baselen;
 
841
        struct ieee802_11_elems elems;
 
842
 
 
843
        baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt;
 
844
        if (baselen > len)
 
845
                return;
 
846
 
 
847
        ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen,
 
848
                                &elems);
 
849
 
 
850
        ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems, false);
 
851
}
 
852
 
 
853
static void ieee80211_rx_mgmt_beacon(struct ieee80211_sub_if_data *sdata,
 
854
                                     struct ieee80211_mgmt *mgmt,
 
855
                                     size_t len,
 
856
                                     struct ieee80211_rx_status *rx_status)
 
857
{
 
858
        size_t baselen;
 
859
        struct ieee802_11_elems elems;
 
860
 
 
861
        /* Process beacon from the current BSS */
 
862
        baselen = (u8 *) mgmt->u.beacon.variable - (u8 *) mgmt;
 
863
        if (baselen > len)
 
864
                return;
 
865
 
 
866
        ieee802_11_parse_elems(mgmt->u.beacon.variable, len - baselen, &elems);
 
867
 
 
868
        ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems, true);
 
869
}
 
870
 
 
871
void ieee80211_ibss_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata,
 
872
                                   struct sk_buff *skb)
 
873
{
 
874
        struct ieee80211_rx_status *rx_status;
 
875
        struct ieee80211_mgmt *mgmt;
 
876
        u16 fc;
 
877
 
 
878
        rx_status = IEEE80211_SKB_RXCB(skb);
 
879
        mgmt = (struct ieee80211_mgmt *) skb->data;
 
880
        fc = le16_to_cpu(mgmt->frame_control);
 
881
 
 
882
        mutex_lock(&sdata->u.ibss.mtx);
 
883
 
 
884
        if (!sdata->u.ibss.ssid_len)
 
885
                goto mgmt_out; /* not ready to merge yet */
 
886
 
 
887
        switch (fc & IEEE80211_FCTL_STYPE) {
 
888
        case IEEE80211_STYPE_PROBE_REQ:
 
889
                ieee80211_rx_mgmt_probe_req(sdata, skb);
 
890
                break;
 
891
        case IEEE80211_STYPE_PROBE_RESP:
 
892
                ieee80211_rx_mgmt_probe_resp(sdata, mgmt, skb->len,
 
893
                                             rx_status);
 
894
                break;
 
895
        case IEEE80211_STYPE_BEACON:
 
896
                ieee80211_rx_mgmt_beacon(sdata, mgmt, skb->len,
 
897
                                         rx_status);
 
898
                break;
 
899
        case IEEE80211_STYPE_AUTH:
 
900
                ieee80211_rx_mgmt_auth_ibss(sdata, mgmt, skb->len);
 
901
                break;
 
902
        }
 
903
 
 
904
 mgmt_out:
 
905
        mutex_unlock(&sdata->u.ibss.mtx);
 
906
}
 
907
 
 
908
void ieee80211_ibss_work(struct ieee80211_sub_if_data *sdata)
 
909
{
 
910
        struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
 
911
        struct sta_info *sta;
 
912
 
 
913
        mutex_lock(&ifibss->mtx);
 
914
 
 
915
        /*
 
916
         * Work could be scheduled after scan or similar
 
917
         * when we aren't even joined (or trying) with a
 
918
         * network.
 
919
         */
 
920
        if (!ifibss->ssid_len)
 
921
                goto out;
 
922
 
 
923
        spin_lock_bh(&ifibss->incomplete_lock);
 
924
        while (!list_empty(&ifibss->incomplete_stations)) {
 
925
                sta = list_first_entry(&ifibss->incomplete_stations,
 
926
                                       struct sta_info, list);
 
927
                list_del(&sta->list);
 
928
                spin_unlock_bh(&ifibss->incomplete_lock);
 
929
 
 
930
                ieee80211_ibss_finish_sta(sta, true);
 
931
                rcu_read_unlock();
 
932
                spin_lock_bh(&ifibss->incomplete_lock);
 
933
        }
 
934
        spin_unlock_bh(&ifibss->incomplete_lock);
 
935
 
 
936
        switch (ifibss->state) {
 
937
        case IEEE80211_IBSS_MLME_SEARCH:
 
938
                ieee80211_sta_find_ibss(sdata);
 
939
                break;
 
940
        case IEEE80211_IBSS_MLME_JOINED:
 
941
                ieee80211_sta_merge_ibss(sdata);
 
942
                break;
 
943
        default:
 
944
                WARN_ON(1);
 
945
                break;
 
946
        }
 
947
 
 
948
 out:
 
949
        mutex_unlock(&ifibss->mtx);
 
950
}
 
951
 
 
952
static void ieee80211_ibss_timer(unsigned long data)
 
953
{
 
954
        struct ieee80211_sub_if_data *sdata =
 
955
                (struct ieee80211_sub_if_data *) data;
 
956
        struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
 
957
        struct ieee80211_local *local = sdata->local;
 
958
 
 
959
        if (local->quiescing) {
 
960
                ifibss->timer_running = true;
 
961
                return;
 
962
        }
 
963
 
 
964
        ieee80211_queue_work(&local->hw, &sdata->work);
 
965
}
 
966
 
 
967
#ifdef CONFIG_PM
 
968
void ieee80211_ibss_quiesce(struct ieee80211_sub_if_data *sdata)
 
969
{
 
970
        struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
 
971
 
 
972
        if (del_timer_sync(&ifibss->timer))
 
973
                ifibss->timer_running = true;
 
974
}
 
975
 
 
976
void ieee80211_ibss_restart(struct ieee80211_sub_if_data *sdata)
 
977
{
 
978
        struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
 
979
 
 
980
        if (ifibss->timer_running) {
 
981
                add_timer(&ifibss->timer);
 
982
                ifibss->timer_running = false;
 
983
        }
 
984
}
 
985
#endif
 
986
 
 
987
void ieee80211_ibss_setup_sdata(struct ieee80211_sub_if_data *sdata)
 
988
{
 
989
        struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
 
990
 
 
991
        setup_timer(&ifibss->timer, ieee80211_ibss_timer,
 
992
                    (unsigned long) sdata);
 
993
        mutex_init(&ifibss->mtx);
 
994
        INIT_LIST_HEAD(&ifibss->incomplete_stations);
 
995
        spin_lock_init(&ifibss->incomplete_lock);
 
996
}
 
997
 
 
998
/* scan finished notification */
 
999
void ieee80211_ibss_notify_scan_completed(struct ieee80211_local *local)
 
1000
{
 
1001
        struct ieee80211_sub_if_data *sdata;
 
1002
 
 
1003
        mutex_lock(&local->iflist_mtx);
 
1004
        list_for_each_entry(sdata, &local->interfaces, list) {
 
1005
                if (!ieee80211_sdata_running(sdata))
 
1006
                        continue;
 
1007
                if (sdata->vif.type != NL80211_IFTYPE_ADHOC)
 
1008
                        continue;
 
1009
                sdata->u.ibss.last_scan_completed = jiffies;
 
1010
                ieee80211_queue_work(&local->hw, &sdata->work);
 
1011
        }
 
1012
        mutex_unlock(&local->iflist_mtx);
 
1013
}
 
1014
 
 
1015
int ieee80211_ibss_join(struct ieee80211_sub_if_data *sdata,
 
1016
                        struct cfg80211_ibss_params *params)
 
1017
{
 
1018
        struct sk_buff *skb;
 
1019
        u32 changed = 0;
 
1020
 
 
1021
        skb = dev_alloc_skb(sdata->local->hw.extra_tx_headroom +
 
1022
                            sizeof(struct ieee80211_hdr_3addr) +
 
1023
                            12 /* struct ieee80211_mgmt.u.beacon */ +
 
1024
                            2 + IEEE80211_MAX_SSID_LEN /* max SSID */ +
 
1025
                            2 + 8 /* max Supported Rates */ +
 
1026
                            3 /* max DS params */ +
 
1027
                            4 /* IBSS params */ +
 
1028
                            2 + (IEEE80211_MAX_SUPP_RATES - 8) +
 
1029
                            2 + sizeof(struct ieee80211_ht_cap) +
 
1030
                            2 + sizeof(struct ieee80211_ht_operation) +
 
1031
                            params->ie_len);
 
1032
        if (!skb)
 
1033
                return -ENOMEM;
 
1034
 
 
1035
        mutex_lock(&sdata->u.ibss.mtx);
 
1036
 
 
1037
        if (params->bssid) {
 
1038
                memcpy(sdata->u.ibss.bssid, params->bssid, ETH_ALEN);
 
1039
                sdata->u.ibss.fixed_bssid = true;
 
1040
        } else
 
1041
                sdata->u.ibss.fixed_bssid = false;
 
1042
 
 
1043
        sdata->u.ibss.privacy = params->privacy;
 
1044
        sdata->u.ibss.control_port = params->control_port;
 
1045
        sdata->u.ibss.basic_rates = params->basic_rates;
 
1046
        memcpy(sdata->vif.bss_conf.mcast_rate, params->mcast_rate,
 
1047
               sizeof(params->mcast_rate));
 
1048
 
 
1049
        sdata->vif.bss_conf.beacon_int = params->beacon_interval;
 
1050
 
 
1051
        sdata->u.ibss.channel = params->channel;
 
1052
        sdata->u.ibss.channel_type = params->channel_type;
 
1053
        sdata->u.ibss.fixed_channel = params->channel_fixed;
 
1054
 
 
1055
        /* fix ourselves to that channel now already */
 
1056
        if (params->channel_fixed) {
 
1057
                sdata->local->oper_channel = params->channel;
 
1058
                if (!ieee80211_set_channel_type(sdata->local, sdata,
 
1059
                                               params->channel_type)) {
 
1060
                        mutex_unlock(&sdata->u.ibss.mtx);
 
1061
                        kfree_skb(skb);
 
1062
                        return -EINVAL;
 
1063
                }
 
1064
        }
 
1065
 
 
1066
        if (params->ie) {
 
1067
                sdata->u.ibss.ie = kmemdup(params->ie, params->ie_len,
 
1068
                                           GFP_KERNEL);
 
1069
                if (sdata->u.ibss.ie)
 
1070
                        sdata->u.ibss.ie_len = params->ie_len;
 
1071
        }
 
1072
 
 
1073
        sdata->u.ibss.skb = skb;
 
1074
        sdata->u.ibss.state = IEEE80211_IBSS_MLME_SEARCH;
 
1075
        sdata->u.ibss.ibss_join_req = jiffies;
 
1076
 
 
1077
        memcpy(sdata->u.ibss.ssid, params->ssid, IEEE80211_MAX_SSID_LEN);
 
1078
        sdata->u.ibss.ssid_len = params->ssid_len;
 
1079
 
 
1080
        mutex_unlock(&sdata->u.ibss.mtx);
 
1081
 
 
1082
        mutex_lock(&sdata->local->mtx);
 
1083
        ieee80211_recalc_idle(sdata->local);
 
1084
        mutex_unlock(&sdata->local->mtx);
 
1085
 
 
1086
        /*
 
1087
         * 802.11n-2009 9.13.3.1: In an IBSS, the HT Protection field is
 
1088
         * reserved, but an HT STA shall protect HT transmissions as though
 
1089
         * the HT Protection field were set to non-HT mixed mode.
 
1090
         *
 
1091
         * In an IBSS, the RIFS Mode field of the HT Operation element is
 
1092
         * also reserved, but an HT STA shall operate as though this field
 
1093
         * were set to 1.
 
1094
         */
 
1095
 
 
1096
        sdata->vif.bss_conf.ht_operation_mode |=
 
1097
                  IEEE80211_HT_OP_MODE_PROTECTION_NONHT_MIXED
 
1098
                | IEEE80211_HT_PARAM_RIFS_MODE;
 
1099
 
 
1100
        changed |= BSS_CHANGED_HT;
 
1101
        ieee80211_bss_info_change_notify(sdata, changed);
 
1102
 
 
1103
        ieee80211_queue_work(&sdata->local->hw, &sdata->work);
 
1104
 
 
1105
        return 0;
 
1106
}
 
1107
 
 
1108
int ieee80211_ibss_leave(struct ieee80211_sub_if_data *sdata)
 
1109
{
 
1110
        struct sk_buff *skb;
 
1111
        struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
 
1112
        struct ieee80211_local *local = sdata->local;
 
1113
        struct cfg80211_bss *cbss;
 
1114
        u16 capability;
 
1115
        int active_ibss;
 
1116
        struct sta_info *sta;
 
1117
 
 
1118
        mutex_lock(&sdata->u.ibss.mtx);
 
1119
 
 
1120
        sdata->u.ibss.state = IEEE80211_IBSS_MLME_SEARCH;
 
1121
        memset(sdata->u.ibss.bssid, 0, ETH_ALEN);
 
1122
        sdata->u.ibss.ssid_len = 0;
 
1123
 
 
1124
        active_ibss = ieee80211_sta_active_ibss(sdata);
 
1125
 
 
1126
        if (!active_ibss && !is_zero_ether_addr(ifibss->bssid)) {
 
1127
                capability = WLAN_CAPABILITY_IBSS;
 
1128
 
 
1129
                if (ifibss->privacy)
 
1130
                        capability |= WLAN_CAPABILITY_PRIVACY;
 
1131
 
 
1132
                cbss = cfg80211_get_bss(local->hw.wiphy, ifibss->channel,
 
1133
                                        ifibss->bssid, ifibss->ssid,
 
1134
                                        ifibss->ssid_len, WLAN_CAPABILITY_IBSS |
 
1135
                                        WLAN_CAPABILITY_PRIVACY,
 
1136
                                        capability);
 
1137
 
 
1138
                if (cbss) {
 
1139
                        cfg80211_unlink_bss(local->hw.wiphy, cbss);
 
1140
                        cfg80211_put_bss(cbss);
 
1141
                }
 
1142
        }
 
1143
 
 
1144
        sta_info_flush(sdata->local, sdata);
 
1145
 
 
1146
        spin_lock_bh(&ifibss->incomplete_lock);
 
1147
        while (!list_empty(&ifibss->incomplete_stations)) {
 
1148
                sta = list_first_entry(&ifibss->incomplete_stations,
 
1149
                                       struct sta_info, list);
 
1150
                list_del(&sta->list);
 
1151
                spin_unlock_bh(&ifibss->incomplete_lock);
 
1152
 
 
1153
                sta_info_free(local, sta);
 
1154
                spin_lock_bh(&ifibss->incomplete_lock);
 
1155
        }
 
1156
        spin_unlock_bh(&ifibss->incomplete_lock);
 
1157
 
 
1158
        netif_carrier_off(sdata->dev);
 
1159
 
 
1160
        /* remove beacon */
 
1161
        kfree(sdata->u.ibss.ie);
 
1162
        skb = rcu_dereference_protected(sdata->u.ibss.presp,
 
1163
                                        lockdep_is_held(&sdata->u.ibss.mtx));
 
1164
        RCU_INIT_POINTER(sdata->u.ibss.presp, NULL);
 
1165
        sdata->vif.bss_conf.ibss_joined = false;
 
1166
        ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BEACON_ENABLED |
 
1167
                                                BSS_CHANGED_IBSS);
 
1168
        synchronize_rcu();
 
1169
        kfree_skb(skb);
 
1170
 
 
1171
        skb_queue_purge(&sdata->skb_queue);
 
1172
 
 
1173
        del_timer_sync(&sdata->u.ibss.timer);
 
1174
 
 
1175
        mutex_unlock(&sdata->u.ibss.mtx);
 
1176
 
 
1177
        mutex_lock(&local->mtx);
 
1178
        ieee80211_recalc_idle(sdata->local);
 
1179
        mutex_unlock(&local->mtx);
 
1180
 
 
1181
        return 0;
 
1182
}