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mac80211: fix BSS leak
[linux-2.6-block.git] / net / mac80211 / ibss.c
CommitLineData
46900298
JB		 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/if_ether.h>
17#include <linux/skbuff.h>
18#include <linux/if_arp.h>
19#include <linux/etherdevice.h>
20#include <linux/rtnetlink.h>
21#include <net/mac80211.h>
22#include <asm/unaligned.h>
23
24#include "ieee80211_i.h"
24487981 25#include "driver-ops.h"
46900298
JB		 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)
4a332a38 33#define IEEE80211_IBSS_MERGE_DELAY 0x400000
46900298
JB		 34#define IEEE80211_IBSS_INACTIVITY_LIMIT (60 * HZ)
35
36#define IEEE80211_IBSS_MAX_STA_ENTRIES 128
37
38
39static void ieee80211_rx_mgmt_auth_ibss(struct ieee80211_sub_if_data *sdata,
40 struct ieee80211_mgmt *mgmt,
41 size_t len)
42{
43 u16 auth_alg, auth_transaction, status_code;
44
45 if (len < 24 + 6)
46 return;
47
48 auth_alg = le16_to_cpu(mgmt->u.auth.auth_alg);
49 auth_transaction = le16_to_cpu(mgmt->u.auth.auth_transaction);
50 status_code = le16_to_cpu(mgmt->u.auth.status_code);
51
52 /*
53 * IEEE 802.11 standard does not require authentication in IBSS
54 * networks and most implementations do not seem to use it.
55 * However, try to reply to authentication attempts if someone
56 * has actually implemented this.
57 */
58 if (auth_alg == WLAN_AUTH_OPEN && auth_transaction == 1)
59 ieee80211_send_auth(sdata, 2, WLAN_AUTH_OPEN, NULL, 0,
fffd0934 60 sdata->u.ibss.bssid, NULL, 0, 0);
46900298
JB		 61}
62
af8cdcd8
JB		 63static void __ieee80211_sta_join_ibss(struct ieee80211_sub_if_data *sdata,
64 const u8 *bssid, const int beacon_int,
65 struct ieee80211_channel *chan,
b59066a2 66 const u32 basic_rates,
af8cdcd8 67 const u16 capability, u64 tsf)
46900298
JB		 68{
69 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
70 struct ieee80211_local *local = sdata->local;
b59066a2 71 int rates, i;
46900298
JB		 72 struct sk_buff *skb;
73 struct ieee80211_mgmt *mgmt;
74 u8 *pos;
75 struct ieee80211_supported_band *sband;
f446d10f 76 struct cfg80211_bss *bss;
57c4d7b4 77 u32 bss_change;
b59066a2 78 u8 supp_rates[IEEE80211_MAX_SUPP_RATES];
24487981
JB		 79
80 /* Reset own TSF to allow time synchronization work. */
81 drv_reset_tsf(local);
46900298 82
af8cdcd8
JB		 83 skb = ifibss->skb;
84 rcu_assign_pointer(ifibss->presp, NULL);
85 synchronize_rcu();
86 skb->data = skb->head;
87 skb->len = 0;
88 skb_reset_tail_pointer(skb);
89 skb_reserve(skb, sdata->local->hw.extra_tx_headroom);
46900298 90
af8cdcd8
JB		 91 if (memcmp(ifibss->bssid, bssid, ETH_ALEN))
92 sta_info_flush(sdata->local, sdata);
46900298
JB		 93
94 memcpy(ifibss->bssid, bssid, ETH_ALEN);
46900298 95
af8cdcd8 96 sdata->drop_unencrypted = capability & WLAN_CAPABILITY_PRIVACY ? 1 : 0;
46900298 97
af8cdcd8
JB		 98 local->oper_channel = chan;
99 local->oper_channel_type = NL80211_CHAN_NO_HT;
100 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_CHANNEL);
57c4d7b4 101
af8cdcd8 102 sband = local->hw.wiphy->bands[chan->band];
46900298 103
b59066a2
JB		 104 /* build supported rates array */
105 pos = supp_rates;
106 for (i = 0; i < sband->n_bitrates; i++) {
107 int rate = sband->bitrates[i].bitrate;
108 u8 basic = 0;
109 if (basic_rates & BIT(i))
110 basic = 0x80;
111 *pos++ = basic | (u8) (rate / 5);
112 }
113
46900298 114 /* Build IBSS probe response */
af8cdcd8 115 mgmt = (void *) skb_put(skb, 24 + sizeof(mgmt->u.beacon));
46900298
JB		 116 memset(mgmt, 0, 24 + sizeof(mgmt->u.beacon));
117 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
118 IEEE80211_STYPE_PROBE_RESP);
119 memset(mgmt->da, 0xff, ETH_ALEN);
120 memcpy(mgmt->sa, sdata->dev->dev_addr, ETH_ALEN);
121 memcpy(mgmt->bssid, ifibss->bssid, ETH_ALEN);
57c4d7b4 122 mgmt->u.beacon.beacon_int = cpu_to_le16(beacon_int);
707c1b4e 123 mgmt->u.beacon.timestamp = cpu_to_le64(tsf);
46900298
JB		 124 mgmt->u.beacon.capab_info = cpu_to_le16(capability);
125
126 pos = skb_put(skb, 2 + ifibss->ssid_len);
127 *pos++ = WLAN_EID_SSID;
128 *pos++ = ifibss->ssid_len;
129 memcpy(pos, ifibss->ssid, ifibss->ssid_len);
130
b59066a2 131 rates = sband->n_bitrates;
46900298
JB		 132 if (rates > 8)
133 rates = 8;
134 pos = skb_put(skb, 2 + rates);
135 *pos++ = WLAN_EID_SUPP_RATES;
136 *pos++ = rates;
137 memcpy(pos, supp_rates, rates);
138
139 if (sband->band == IEEE80211_BAND_2GHZ) {
140 pos = skb_put(skb, 2 + 1);
141 *pos++ = WLAN_EID_DS_PARAMS;
142 *pos++ = 1;
af8cdcd8 143 *pos++ = ieee80211_frequency_to_channel(chan->center_freq);
46900298
JB		 144 }
145
146 pos = skb_put(skb, 2 + 2);
147 *pos++ = WLAN_EID_IBSS_PARAMS;
148 *pos++ = 2;
149 /* FIX: set ATIM window based on scan results */
150 *pos++ = 0;
151 *pos++ = 0;
152
b59066a2
JB		 153 if (sband->n_bitrates > 8) {
154 rates = sband->n_bitrates - 8;
46900298
JB		 155 pos = skb_put(skb, 2 + rates);
156 *pos++ = WLAN_EID_EXT_SUPP_RATES;
157 *pos++ = rates;
158 memcpy(pos, &supp_rates[8], rates);
159 }
160
af8cdcd8
JB		 161 if (ifibss->ie_len)
162 memcpy(skb_put(skb, ifibss->ie_len),
163 ifibss->ie, ifibss->ie_len);
164
165 rcu_assign_pointer(ifibss->presp, skb);
46900298 166
2d0ddec5
JB		 167 sdata->vif.bss_conf.beacon_int = beacon_int;
168 bss_change = BSS_CHANGED_BEACON_INT;
169 bss_change |= ieee80211_reset_erp_info(sdata);
170 bss_change |= BSS_CHANGED_BSSID;
171 bss_change |= BSS_CHANGED_BEACON;
172 bss_change |= BSS_CHANGED_BEACON_ENABLED;
173 ieee80211_bss_info_change_notify(sdata, bss_change);
46900298 174
b59066a2 175 ieee80211_sta_def_wmm_params(sdata, sband->n_bitrates, supp_rates);
46900298 176
46900298 177 ifibss->state = IEEE80211_IBSS_MLME_JOINED;
af8cdcd8
JB		 178 mod_timer(&ifibss->timer,
179 round_jiffies(jiffies + IEEE80211_IBSS_MERGE_INTERVAL));
46900298 180
f446d10f
JB		 181 bss = cfg80211_inform_bss_frame(local->hw.wiphy, local->hw.conf.channel,
182 mgmt, skb->len, 0, GFP_KERNEL);
183 cfg80211_put_bss(bss);
af8cdcd8 184 cfg80211_ibss_joined(sdata->dev, ifibss->bssid, GFP_KERNEL);
46900298
JB		 185}
186
af8cdcd8
JB		 187static void ieee80211_sta_join_ibss(struct ieee80211_sub_if_data *sdata,
188 struct ieee80211_bss *bss)
46900298 189{
b59066a2
JB		 190 struct ieee80211_supported_band *sband;
191 u32 basic_rates;
192 int i, j;
57c4d7b4
JB		 193 u16 beacon_int = bss->cbss.beacon_interval;
194
195 if (beacon_int < 10)
196 beacon_int = 10;
197
b59066a2
JB		 198 sband = sdata->local->hw.wiphy->bands[bss->cbss.channel->band];
199
200 basic_rates = 0;
201
202 for (i = 0; i < bss->supp_rates_len; i++) {
203 int rate = (bss->supp_rates[i] & 0x7f) * 5;
204 bool is_basic = !!(bss->supp_rates[i] & 0x80);
205
206 for (j = 0; j < sband->n_bitrates; j++) {
207 if (sband->bitrates[j].bitrate == rate) {
208 if (is_basic)
209 basic_rates |= BIT(j);
210 break;
211 }
212 }
213 }
214
af8cdcd8 215 __ieee80211_sta_join_ibss(sdata, bss->cbss.bssid,
57c4d7b4 216 beacon_int,
af8cdcd8 217 bss->cbss.channel,
b59066a2 218 basic_rates,
af8cdcd8
JB		 219 bss->cbss.capability,
220 bss->cbss.tsf);
46900298
JB		 221}
222
223static void ieee80211_rx_bss_info(struct ieee80211_sub_if_data *sdata,
224 struct ieee80211_mgmt *mgmt,
225 size_t len,
226 struct ieee80211_rx_status *rx_status,
227 struct ieee802_11_elems *elems,
228 bool beacon)
229{
230 struct ieee80211_local *local = sdata->local;
231 int freq;
232 struct ieee80211_bss *bss;
233 struct sta_info *sta;
234 struct ieee80211_channel *channel;
235 u64 beacon_timestamp, rx_timestamp;
236 u32 supp_rates = 0;
237 enum ieee80211_band band = rx_status->band;
238
239 if (elems->ds_params && elems->ds_params_len == 1)
240 freq = ieee80211_channel_to_frequency(elems->ds_params[0]);
241 else
242 freq = rx_status->freq;
243
244 channel = ieee80211_get_channel(local->hw.wiphy, freq);
245
246 if (!channel || channel->flags & IEEE80211_CHAN_DISABLED)
247 return;
248
249 if (sdata->vif.type == NL80211_IFTYPE_ADHOC && elems->supp_rates &&
250 memcmp(mgmt->bssid, sdata->u.ibss.bssid, ETH_ALEN) == 0) {
251 supp_rates = ieee80211_sta_get_rates(local, elems, band);
252
253 rcu_read_lock();
254
255 sta = sta_info_get(local, mgmt->sa);
256 if (sta) {
257 u32 prev_rates;
258
259 prev_rates = sta->sta.supp_rates[band];
260 /* make sure mandatory rates are always added */
261 sta->sta.supp_rates[band] = supp_rates |
262 ieee80211_mandatory_rates(local, band);
263
264#ifdef CONFIG_MAC80211_IBSS_DEBUG
265 if (sta->sta.supp_rates[band] != prev_rates)
266 printk(KERN_DEBUG "%s: updated supp_rates set "
267 "for %pM based on beacon info (0x%llx | "
268 "0x%llx -> 0x%llx)\n",
269 sdata->dev->name,
270 sta->sta.addr,
271 (unsigned long long) prev_rates,
272 (unsigned long long) supp_rates,
273 (unsigned long long) sta->sta.supp_rates[band]);
274#endif
275 } else
276 ieee80211_ibss_add_sta(sdata, mgmt->bssid, mgmt->sa, supp_rates);
277
278 rcu_read_unlock();
279 }
280
281 bss = ieee80211_bss_info_update(local, rx_status, mgmt, len, elems,
282 channel, beacon);
283 if (!bss)
284 return;
285
286 /* was just updated in ieee80211_bss_info_update */
287 beacon_timestamp = bss->cbss.tsf;
288
289 /* check if we need to merge IBSS */
290
291 /* merge only on beacons (???) */
292 if (!beacon)
293 goto put_bss;
294
295 /* we use a fixed BSSID */
af8cdcd8 296 if (sdata->u.ibss.bssid)
46900298
JB		 297 goto put_bss;
298
299 /* not an IBSS */
300 if (!(bss->cbss.capability & WLAN_CAPABILITY_IBSS))
301 goto put_bss;
302
303 /* different channel */
304 if (bss->cbss.channel != local->oper_channel)
305 goto put_bss;
306
307 /* different SSID */
308 if (elems->ssid_len != sdata->u.ibss.ssid_len ||
309 memcmp(elems->ssid, sdata->u.ibss.ssid,
310 sdata->u.ibss.ssid_len))
311 goto put_bss;
312
34e8f082
AF		 313 /* same BSSID */
314 if (memcmp(bss->cbss.bssid, sdata->u.ibss.bssid, ETH_ALEN) == 0)
315 goto put_bss;
316
46900298
JB		 317 if (rx_status->flag & RX_FLAG_TSFT) {
318 /*
319 * For correct IBSS merging we need mactime; since mactime is
320 * defined as the time the first data symbol of the frame hits
321 * the PHY, and the timestamp of the beacon is defined as "the
322 * time that the data symbol containing the first bit of the
323 * timestamp is transmitted to the PHY plus the transmitting
324 * STA's delays through its local PHY from the MAC-PHY
325 * interface to its interface with the WM" (802.11 11.1.2)
326 * - equals the time this bit arrives at the receiver - we have
327 * to take into account the offset between the two.
328 *
329 * E.g. at 1 MBit that means mactime is 192 usec earlier
330 * (=24 bytes * 8 usecs/byte) than the beacon timestamp.
331 */
332 int rate;
333
334 if (rx_status->flag & RX_FLAG_HT)
335 rate = 65; /* TODO: HT rates */
336 else
337 rate = local->hw.wiphy->bands[band]->
338 bitrates[rx_status->rate_idx].bitrate;
339
340 rx_timestamp = rx_status->mactime + (24 * 8 * 10 / rate);
24487981
JB		 341 } else {
342 /*
343 * second best option: get current TSF
344 * (will return -1 if not supported)
345 */
346 rx_timestamp = drv_get_tsf(local);
347 }
46900298
JB		 348
349#ifdef CONFIG_MAC80211_IBSS_DEBUG
350 printk(KERN_DEBUG "RX beacon SA=%pM BSSID="
351 "%pM TSF=0x%llx BCN=0x%llx diff=%lld @%lu\n",
352 mgmt->sa, mgmt->bssid,
353 (unsigned long long)rx_timestamp,
354 (unsigned long long)beacon_timestamp,
355 (unsigned long long)(rx_timestamp - beacon_timestamp),
356 jiffies);
357#endif
358
4a332a38
AF		 359 /* give slow hardware some time to do the TSF sync */
360 if (rx_timestamp < IEEE80211_IBSS_MERGE_DELAY)
361 goto put_bss;
362
46900298
JB		 363 if (beacon_timestamp > rx_timestamp) {
364#ifdef CONFIG_MAC80211_IBSS_DEBUG
365 printk(KERN_DEBUG "%s: beacon TSF higher than "
366 "local TSF - IBSS merge with BSSID %pM\n",
367 sdata->dev->name, mgmt->bssid);
368#endif
369 ieee80211_sta_join_ibss(sdata, bss);
370 ieee80211_ibss_add_sta(sdata, mgmt->bssid, mgmt->sa, supp_rates);
371 }
372
373 put_bss:
374 ieee80211_rx_bss_put(local, bss);
375}
376
377/*
378 * Add a new IBSS station, will also be called by the RX code when,
379 * in IBSS mode, receiving a frame from a yet-unknown station, hence
380 * must be callable in atomic context.
381 */
382struct sta_info *ieee80211_ibss_add_sta(struct ieee80211_sub_if_data *sdata,
383 u8 *bssid,u8 *addr, u32 supp_rates)
384{
385 struct ieee80211_local *local = sdata->local;
386 struct sta_info *sta;
387 int band = local->hw.conf.channel->band;
388
af8cdcd8
JB		 389 /*
390 * XXX: Consider removing the least recently used entry and
391 * allow new one to be added.
392 */
46900298 393 if (local->num_sta >= IEEE80211_IBSS_MAX_STA_ENTRIES) {
af8cdcd8
JB		 394 if (net_ratelimit())
395 printk(KERN_DEBUG "%s: No room for a new IBSS STA entry %pM\n",
396 sdata->dev->name, addr);
46900298
JB		 397 return NULL;
398 }
399
400 if (compare_ether_addr(bssid, sdata->u.ibss.bssid))
401 return NULL;
402
403#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
404 printk(KERN_DEBUG "%s: Adding new IBSS station %pM (dev=%s)\n",
405 wiphy_name(local->hw.wiphy), addr, sdata->dev->name);
406#endif
407
408 sta = sta_info_alloc(sdata, addr, GFP_ATOMIC);
409 if (!sta)
410 return NULL;
411
412 set_sta_flags(sta, WLAN_STA_AUTHORIZED);
413
414 /* make sure mandatory rates are always added */
415 sta->sta.supp_rates[band] = supp_rates |
416 ieee80211_mandatory_rates(local, band);
417
418 rate_control_rate_init(sta);
419
420 if (sta_info_insert(sta))
421 return NULL;
422
423 return sta;
424}
425
426static int ieee80211_sta_active_ibss(struct ieee80211_sub_if_data *sdata)
427{
428 struct ieee80211_local *local = sdata->local;
429 int active = 0;
430 struct sta_info *sta;
431
432 rcu_read_lock();
433
434 list_for_each_entry_rcu(sta, &local->sta_list, list) {
435 if (sta->sdata == sdata &&
436 time_after(sta->last_rx + IEEE80211_IBSS_MERGE_INTERVAL,
437 jiffies)) {
438 active++;
439 break;
440 }
441 }
442
443 rcu_read_unlock();
444
445 return active;
446}
447
448
449static void ieee80211_sta_merge_ibss(struct ieee80211_sub_if_data *sdata)
450{
451 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
452
af8cdcd8
JB		 453 mod_timer(&ifibss->timer,
454 round_jiffies(jiffies + IEEE80211_IBSS_MERGE_INTERVAL));
46900298
JB		 455
456 ieee80211_sta_expire(sdata, IEEE80211_IBSS_INACTIVITY_LIMIT);
af8cdcd8 457
46900298
JB		 458 if (ieee80211_sta_active_ibss(sdata))
459 return;
460
af8cdcd8 461 if (ifibss->fixed_channel)
46900298
JB		 462 return;
463
464 printk(KERN_DEBUG "%s: No active IBSS STAs - trying to scan for other "
465 "IBSS networks with same SSID (merge)\n", sdata->dev->name);
466
f3b85252 467 ieee80211_request_internal_scan(sdata, ifibss->ssid, ifibss->ssid_len);
46900298
JB		 468}
469
af8cdcd8 470static void ieee80211_sta_create_ibss(struct ieee80211_sub_if_data *sdata)
46900298
JB		 471{
472 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
473 struct ieee80211_local *local = sdata->local;
474 struct ieee80211_supported_band *sband;
46900298 475 u8 bssid[ETH_ALEN];
46900298
JB		 476 u16 capability;
477 int i;
478
af8cdcd8 479 if (ifibss->fixed_bssid) {
46900298
JB		 480 memcpy(bssid, ifibss->bssid, ETH_ALEN);
481 } else {
482 /* Generate random, not broadcast, locally administered BSSID. Mix in
483 * own MAC address to make sure that devices that do not have proper
484 * random number generator get different BSSID. */
485 get_random_bytes(bssid, ETH_ALEN);
486 for (i = 0; i < ETH_ALEN; i++)
487 bssid[i] ^= sdata->dev->dev_addr[i];
488 bssid[0] &= ~0x01;
489 bssid[0] |= 0x02;
490 }
491
492 printk(KERN_DEBUG "%s: Creating new IBSS network, BSSID %pM\n",
493 sdata->dev->name, bssid);
494
af8cdcd8 495 sband = local->hw.wiphy->bands[ifibss->channel->band];
46900298 496
46900298
JB		 497 capability = WLAN_CAPABILITY_IBSS;
498
fffd0934 499 if (ifibss->privacy)
46900298
JB		 500 capability |= WLAN_CAPABILITY_PRIVACY;
501 else
502 sdata->drop_unencrypted = 0;
503
57c4d7b4 504 __ieee80211_sta_join_ibss(sdata, bssid, sdata->vif.bss_conf.beacon_int,
b59066a2
JB		 505 ifibss->channel, 3, /* first two are basic */
506 capability, 0);
46900298
JB		 507}
508
af8cdcd8 509static void ieee80211_sta_find_ibss(struct ieee80211_sub_if_data *sdata)
46900298
JB		 510{
511 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
512 struct ieee80211_local *local = sdata->local;
513 struct ieee80211_bss *bss;
af8cdcd8 514 struct ieee80211_channel *chan = NULL;
46900298
JB		 515 const u8 *bssid = NULL;
516 int active_ibss;
e0d61887 517 u16 capability;
46900298 518
46900298
JB		 519 active_ibss = ieee80211_sta_active_ibss(sdata);
520#ifdef CONFIG_MAC80211_IBSS_DEBUG
521 printk(KERN_DEBUG "%s: sta_find_ibss (active_ibss=%d)\n",
522 sdata->dev->name, active_ibss);
523#endif /* CONFIG_MAC80211_IBSS_DEBUG */
524
525 if (active_ibss)
af8cdcd8 526 return;
46900298 527
e0d61887 528 capability = WLAN_CAPABILITY_IBSS;
fffd0934 529 if (ifibss->privacy)
e0d61887 530 capability |= WLAN_CAPABILITY_PRIVACY;
af8cdcd8
JB		 531 if (ifibss->fixed_bssid)
532 bssid = ifibss->bssid;
533 if (ifibss->fixed_channel)
534 chan = ifibss->channel;
535 if (!is_zero_ether_addr(ifibss->bssid))
46900298 536 bssid = ifibss->bssid;
af8cdcd8 537 bss = (void *)cfg80211_get_bss(local->hw.wiphy, chan, bssid,
46900298 538 ifibss->ssid, ifibss->ssid_len,
e0d61887 539 WLAN_CAPABILITY_IBSS |
db67645d
JB		 540 WLAN_CAPABILITY_PRIVACY,
541 capability);
46900298 542
d419b9f0 543 if (bss) {
46900298 544#ifdef CONFIG_MAC80211_IBSS_DEBUG
46900298
JB		 545 printk(KERN_DEBUG " sta_find_ibss: selected %pM current "
546 "%pM\n", bss->cbss.bssid, ifibss->bssid);
547#endif /* CONFIG_MAC80211_IBSS_DEBUG */
548
46900298
JB		 549 printk(KERN_DEBUG "%s: Selected IBSS BSSID %pM"
550 " based on configured SSID\n",
551 sdata->dev->name, bss->cbss.bssid);
552
af8cdcd8 553 ieee80211_sta_join_ibss(sdata, bss);
46900298 554 ieee80211_rx_bss_put(local, bss);
af8cdcd8 555 return;
d419b9f0 556 }
46900298
JB		 557
558#ifdef CONFIG_MAC80211_IBSS_DEBUG
559 printk(KERN_DEBUG " did not try to join ibss\n");
560#endif /* CONFIG_MAC80211_IBSS_DEBUG */
561
562 /* Selected IBSS not found in current scan results - try to scan */
563 if (ifibss->state == IEEE80211_IBSS_MLME_JOINED &&
564 !ieee80211_sta_active_ibss(sdata)) {
af8cdcd8
JB		 565 mod_timer(&ifibss->timer,
566 round_jiffies(jiffies + IEEE80211_IBSS_MERGE_INTERVAL));
567 } else if (time_after(jiffies, ifibss->last_scan_completed +
46900298
JB		 568 IEEE80211_SCAN_INTERVAL)) {
569 printk(KERN_DEBUG "%s: Trigger new scan to find an IBSS to "
570 "join\n", sdata->dev->name);
571
f3b85252
JB		 572 ieee80211_request_internal_scan(sdata, ifibss->ssid,
573 ifibss->ssid_len);
46900298
JB		 574 } else if (ifibss->state != IEEE80211_IBSS_MLME_JOINED) {
575 int interval = IEEE80211_SCAN_INTERVAL;
576
577 if (time_after(jiffies, ifibss->ibss_join_req +
578 IEEE80211_IBSS_JOIN_TIMEOUT)) {
af8cdcd8
JB		 579 if (!(local->oper_channel->flags & IEEE80211_CHAN_NO_IBSS)) {
580 ieee80211_sta_create_ibss(sdata);
581 return;
582 }
46900298
JB		 583 printk(KERN_DEBUG "%s: IBSS not allowed on"
584 " %d MHz\n", sdata->dev->name,
585 local->hw.conf.channel->center_freq);
586
587 /* No IBSS found - decrease scan interval and continue
588 * scanning. */
589 interval = IEEE80211_SCAN_INTERVAL_SLOW;
590 }
591
592 ifibss->state = IEEE80211_IBSS_MLME_SEARCH;
af8cdcd8
JB		 593 mod_timer(&ifibss->timer,
594 round_jiffies(jiffies + interval));
46900298 595 }
46900298
JB		 596}
597
598static void ieee80211_rx_mgmt_probe_req(struct ieee80211_sub_if_data *sdata,
599 struct ieee80211_mgmt *mgmt,
600 size_t len)
601{
602 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
603 struct ieee80211_local *local = sdata->local;
604 int tx_last_beacon;
605 struct sk_buff *skb;
606 struct ieee80211_mgmt *resp;
607 u8 *pos, *end;
608
609 if (ifibss->state != IEEE80211_IBSS_MLME_JOINED ||
af8cdcd8 610 len < 24 + 2 || !ifibss->presp)
46900298
JB		 611 return;
612
24487981 613 tx_last_beacon = drv_tx_last_beacon(local);
46900298
JB		 614
615#ifdef CONFIG_MAC80211_IBSS_DEBUG
616 printk(KERN_DEBUG "%s: RX ProbeReq SA=%pM DA=%pM BSSID=%pM"
617 " (tx_last_beacon=%d)\n",
618 sdata->dev->name, mgmt->sa, mgmt->da,
619 mgmt->bssid, tx_last_beacon);
620#endif /* CONFIG_MAC80211_IBSS_DEBUG */
621
622 if (!tx_last_beacon)
623 return;
624
625 if (memcmp(mgmt->bssid, ifibss->bssid, ETH_ALEN) != 0 &&
626 memcmp(mgmt->bssid, "\xff\xff\xff\xff\xff\xff", ETH_ALEN) != 0)
627 return;
628
629 end = ((u8 *) mgmt) + len;
630 pos = mgmt->u.probe_req.variable;
631 if (pos[0] != WLAN_EID_SSID ||
632 pos + 2 + pos[1] > end) {
633#ifdef CONFIG_MAC80211_IBSS_DEBUG
634 printk(KERN_DEBUG "%s: Invalid SSID IE in ProbeReq "
635 "from %pM\n",
636 sdata->dev->name, mgmt->sa);
637#endif
638 return;
639 }
640 if (pos[1] != 0 &&
641 (pos[1] != ifibss->ssid_len ||
af8cdcd8 642 !memcmp(pos + 2, ifibss->ssid, ifibss->ssid_len))) {
46900298
JB		 643 /* Ignore ProbeReq for foreign SSID */
644 return;
645 }
646
647 /* Reply with ProbeResp */
af8cdcd8 648 skb = skb_copy(ifibss->presp, GFP_KERNEL);
46900298
JB		 649 if (!skb)
650 return;
651
652 resp = (struct ieee80211_mgmt *) skb->data;
653 memcpy(resp->da, mgmt->sa, ETH_ALEN);
654#ifdef CONFIG_MAC80211_IBSS_DEBUG
655 printk(KERN_DEBUG "%s: Sending ProbeResp to %pM\n",
656 sdata->dev->name, resp->da);
657#endif /* CONFIG_MAC80211_IBSS_DEBUG */
658 ieee80211_tx_skb(sdata, skb, 0);
659}
660
661static void ieee80211_rx_mgmt_probe_resp(struct ieee80211_sub_if_data *sdata,
662 struct ieee80211_mgmt *mgmt,
663 size_t len,
664 struct ieee80211_rx_status *rx_status)
665{
666 size_t baselen;
667 struct ieee802_11_elems elems;
668
669 if (memcmp(mgmt->da, sdata->dev->dev_addr, ETH_ALEN))
670 return; /* ignore ProbeResp to foreign address */
671
672 baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt;
673 if (baselen > len)
674 return;
675
676 ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen,
677 &elems);
678
679 ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems, false);
680}
681
682static void ieee80211_rx_mgmt_beacon(struct ieee80211_sub_if_data *sdata,
683 struct ieee80211_mgmt *mgmt,
684 size_t len,
685 struct ieee80211_rx_status *rx_status)
686{
687 size_t baselen;
688 struct ieee802_11_elems elems;
689
690 /* Process beacon from the current BSS */
691 baselen = (u8 *) mgmt->u.beacon.variable - (u8 *) mgmt;
692 if (baselen > len)
693 return;
694
695 ieee802_11_parse_elems(mgmt->u.beacon.variable, len - baselen, &elems);
696
697 ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems, true);
698}
699
700static void ieee80211_ibss_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata,
701 struct sk_buff *skb)
702{
703 struct ieee80211_rx_status *rx_status;
704 struct ieee80211_mgmt *mgmt;
705 u16 fc;
706
f1d58c25 707 rx_status = IEEE80211_SKB_RXCB(skb);
46900298
JB		 708 mgmt = (struct ieee80211_mgmt *) skb->data;
709 fc = le16_to_cpu(mgmt->frame_control);
710
711 switch (fc & IEEE80211_FCTL_STYPE) {
712 case IEEE80211_STYPE_PROBE_REQ:
713 ieee80211_rx_mgmt_probe_req(sdata, mgmt, skb->len);
714 break;
715 case IEEE80211_STYPE_PROBE_RESP:
716 ieee80211_rx_mgmt_probe_resp(sdata, mgmt, skb->len,
717 rx_status);
718 break;
719 case IEEE80211_STYPE_BEACON:
720 ieee80211_rx_mgmt_beacon(sdata, mgmt, skb->len,
721 rx_status);
722 break;
723 case IEEE80211_STYPE_AUTH:
724 ieee80211_rx_mgmt_auth_ibss(sdata, mgmt, skb->len);
725 break;
726 }
727
728 kfree_skb(skb);
729}
730
731static void ieee80211_ibss_work(struct work_struct *work)
732{
733 struct ieee80211_sub_if_data *sdata =
734 container_of(work, struct ieee80211_sub_if_data, u.ibss.work);
735 struct ieee80211_local *local = sdata->local;
736 struct ieee80211_if_ibss *ifibss;
737 struct sk_buff *skb;
738
5bb644a0
JB		 739 if (WARN_ON(local->suspended))
740 return;
741
46900298
JB		 742 if (!netif_running(sdata->dev))
743 return;
744
fbe9c429 745 if (local->scanning)
46900298
JB		 746 return;
747
748 if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_ADHOC))
749 return;
750 ifibss = &sdata->u.ibss;
751
752 while ((skb = skb_dequeue(&ifibss->skb_queue)))
753 ieee80211_ibss_rx_queued_mgmt(sdata, skb);
754
755 if (!test_and_clear_bit(IEEE80211_IBSS_REQ_RUN, &ifibss->request))
756 return;
757
758 switch (ifibss->state) {
759 case IEEE80211_IBSS_MLME_SEARCH:
760 ieee80211_sta_find_ibss(sdata);
761 break;
762 case IEEE80211_IBSS_MLME_JOINED:
763 ieee80211_sta_merge_ibss(sdata);
764 break;
765 default:
766 WARN_ON(1);
767 break;
768 }
769}
770
771static void ieee80211_ibss_timer(unsigned long data)
772{
773 struct ieee80211_sub_if_data *sdata =
774 (struct ieee80211_sub_if_data *) data;
775 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
776 struct ieee80211_local *local = sdata->local;
777
5bb644a0
JB		 778 if (local->quiescing) {
779 ifibss->timer_running = true;
780 return;
781 }
782
46900298 783 set_bit(IEEE80211_IBSS_REQ_RUN, &ifibss->request);
42935eca 784 ieee80211_queue_work(&local->hw, &ifibss->work);
46900298
JB		 785}
786
5bb644a0
JB		 787#ifdef CONFIG_PM
788void ieee80211_ibss_quiesce(struct ieee80211_sub_if_data *sdata)
789{
790 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
791
792 cancel_work_sync(&ifibss->work);
793 if (del_timer_sync(&ifibss->timer))
794 ifibss->timer_running = true;
795}
796
797void ieee80211_ibss_restart(struct ieee80211_sub_if_data *sdata)
798{
799 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
800
801 if (ifibss->timer_running) {
802 add_timer(&ifibss->timer);
803 ifibss->timer_running = false;
804 }
805}
806#endif
807
46900298
JB		 808void ieee80211_ibss_setup_sdata(struct ieee80211_sub_if_data *sdata)
809{
810 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
811
812 INIT_WORK(&ifibss->work, ieee80211_ibss_work);
813 setup_timer(&ifibss->timer, ieee80211_ibss_timer,
814 (unsigned long) sdata);
815 skb_queue_head_init(&ifibss->skb_queue);
46900298
JB		 816}
817
818/* scan finished notification */
819void ieee80211_ibss_notify_scan_completed(struct ieee80211_local *local)
820{
af8cdcd8 821 struct ieee80211_sub_if_data *sdata;
46900298 822
29b4a4f7
JB		 823 mutex_lock(&local->iflist_mtx);
824 list_for_each_entry(sdata, &local->interfaces, list) {
0e41f715
JB		 825 if (!netif_running(sdata->dev))
826 continue;
af8cdcd8
JB		 827 if (sdata->vif.type != NL80211_IFTYPE_ADHOC)
828 continue;
0e41f715
JB		 829 if (!sdata->u.ibss.ssid_len)
830 continue;
af8cdcd8 831 sdata->u.ibss.last_scan_completed = jiffies;
51f98f13 832 mod_timer(&sdata->u.ibss.timer, 0);
46900298 833 }
29b4a4f7 834 mutex_unlock(&local->iflist_mtx);
46900298
JB		 835}
836
837ieee80211_rx_result
f1d58c25 838ieee80211_ibss_rx_mgmt(struct ieee80211_sub_if_data *sdata, struct sk_buff *skb)
46900298
JB		 839{
840 struct ieee80211_local *local = sdata->local;
841 struct ieee80211_mgmt *mgmt;
842 u16 fc;
843
844 if (skb->len < 24)
845 return RX_DROP_MONITOR;
846
847 mgmt = (struct ieee80211_mgmt *) skb->data;
848 fc = le16_to_cpu(mgmt->frame_control);
849
850 switch (fc & IEEE80211_FCTL_STYPE) {
851 case IEEE80211_STYPE_PROBE_RESP:
852 case IEEE80211_STYPE_BEACON:
46900298
JB		 853 case IEEE80211_STYPE_PROBE_REQ:
854 case IEEE80211_STYPE_AUTH:
855 skb_queue_tail(&sdata->u.ibss.skb_queue, skb);
42935eca 856 ieee80211_queue_work(&local->hw, &sdata->u.ibss.work);
46900298
JB		 857 return RX_QUEUED;
858 }
859
860 return RX_DROP_MONITOR;
861}
af8cdcd8
JB		 862
863int ieee80211_ibss_join(struct ieee80211_sub_if_data *sdata,
864 struct cfg80211_ibss_params *params)
865{
866 struct sk_buff *skb;
867
af8cdcd8
JB		 868 if (params->bssid) {
869 memcpy(sdata->u.ibss.bssid, params->bssid, ETH_ALEN);
870 sdata->u.ibss.fixed_bssid = true;
871 } else
872 sdata->u.ibss.fixed_bssid = false;
873
fffd0934
JB		 874 sdata->u.ibss.privacy = params->privacy;
875
57c4d7b4
JB		 876 sdata->vif.bss_conf.beacon_int = params->beacon_interval;
877
af8cdcd8
JB		 878 sdata->u.ibss.channel = params->channel;
879 sdata->u.ibss.fixed_channel = params->channel_fixed;
880
881 if (params->ie) {
882 sdata->u.ibss.ie = kmemdup(params->ie, params->ie_len,
883 GFP_KERNEL);
884 if (sdata->u.ibss.ie)
885 sdata->u.ibss.ie_len = params->ie_len;
886 }
887
888 skb = dev_alloc_skb(sdata->local->hw.extra_tx_headroom +
889 36 /* bitrates */ +
890 34 /* SSID */ +
891 3 /* DS params */ +
892 4 /* IBSS params */ +
893 params->ie_len);
894 if (!skb)
895 return -ENOMEM;
896
897 sdata->u.ibss.skb = skb;
898 sdata->u.ibss.state = IEEE80211_IBSS_MLME_SEARCH;
899 sdata->u.ibss.ibss_join_req = jiffies;
900
0e41f715
JB		 901 memcpy(sdata->u.ibss.ssid, params->ssid, IEEE80211_MAX_SSID_LEN);
902
903 /*
904 * The ssid_len setting below is used to see whether
905 * we are active, and we need all other settings
906 * before that may get visible.
907 */
908 mb();
909
910 sdata->u.ibss.ssid_len = params->ssid_len;
911
5cff20e6
JB		 912 ieee80211_recalc_idle(sdata->local);
913
af8cdcd8 914 set_bit(IEEE80211_IBSS_REQ_RUN, &sdata->u.ibss.request);
42935eca 915 ieee80211_queue_work(&sdata->local->hw, &sdata->u.ibss.work);
af8cdcd8
JB		 916
917 return 0;
918}
919
920int ieee80211_ibss_leave(struct ieee80211_sub_if_data *sdata)
921{
922 struct sk_buff *skb;
923
924 del_timer_sync(&sdata->u.ibss.timer);
925 clear_bit(IEEE80211_IBSS_REQ_RUN, &sdata->u.ibss.request);
926 cancel_work_sync(&sdata->u.ibss.work);
927 clear_bit(IEEE80211_IBSS_REQ_RUN, &sdata->u.ibss.request);
928
929 sta_info_flush(sdata->local, sdata);
930
931 /* remove beacon */
932 kfree(sdata->u.ibss.ie);
933 skb = sdata->u.ibss.presp;
934 rcu_assign_pointer(sdata->u.ibss.presp, NULL);
2d0ddec5 935 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BEACON_ENABLED);
af8cdcd8
JB		 936 synchronize_rcu();
937 kfree_skb(skb);
938
939 skb_queue_purge(&sdata->u.ibss.skb_queue);
940 memset(sdata->u.ibss.bssid, 0, ETH_ALEN);
5cff20e6
JB		 941 sdata->u.ibss.ssid_len = 0;
942
943 ieee80211_recalc_idle(sdata->local);
af8cdcd8
JB		 944
945 return 0;
946}
Linux 6.x block layer and io_uring tree(s)