aboutsummaryrefslogtreecommitdiffstats
path: root/net/mac80211/ibss.c
diff options
context:
space:
mode:
Diffstat (limited to 'net/mac80211/ibss.c')
-rw-r--r--net/mac80211/ibss.c908
1 files changed, 908 insertions, 0 deletions
diff --git a/net/mac80211/ibss.c b/net/mac80211/ibss.c
new file mode 100644
index 000000000000..3201e1f96365
--- /dev/null
+++ b/net/mac80211/ibss.c
@@ -0,0 +1,908 @@
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"
25#include "rate.h"
26
27#define IEEE80211_SCAN_INTERVAL (2 * HZ)
28#define IEEE80211_SCAN_INTERVAL_SLOW (15 * HZ)
29#define IEEE80211_IBSS_JOIN_TIMEOUT (7 * HZ)
30
31#define IEEE80211_IBSS_MERGE_INTERVAL (30 * HZ)
32#define IEEE80211_IBSS_MERGE_DELAY 0x400000
33#define IEEE80211_IBSS_INACTIVITY_LIMIT (60 * HZ)
34
35#define IEEE80211_IBSS_MAX_STA_ENTRIES 128
36
37
38static void ieee80211_rx_mgmt_auth_ibss(struct ieee80211_sub_if_data *sdata,
39 struct ieee80211_mgmt *mgmt,
40 size_t len)
41{
42 u16 auth_alg, auth_transaction, status_code;
43
44 if (len < 24 + 6)
45 return;
46
47 auth_alg = le16_to_cpu(mgmt->u.auth.auth_alg);
48 auth_transaction = le16_to_cpu(mgmt->u.auth.auth_transaction);
49 status_code = le16_to_cpu(mgmt->u.auth.status_code);
50
51 /*
52 * IEEE 802.11 standard does not require authentication in IBSS
53 * networks and most implementations do not seem to use it.
54 * However, try to reply to authentication attempts if someone
55 * has actually implemented this.
56 */
57 if (auth_alg == WLAN_AUTH_OPEN && auth_transaction == 1)
58 ieee80211_send_auth(sdata, 2, WLAN_AUTH_OPEN, NULL, 0,
59 sdata->u.ibss.bssid, 0);
60}
61
62static int __ieee80211_sta_join_ibss(struct ieee80211_sub_if_data *sdata,
63 const u8 *bssid, const int beacon_int,
64 const int freq,
65 const size_t supp_rates_len,
66 const u8 *supp_rates,
67 const u16 capability, u64 tsf)
68{
69 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
70 struct ieee80211_local *local = sdata->local;
71 int res = 0, rates, i, j;
72 struct sk_buff *skb;
73 struct ieee80211_mgmt *mgmt;
74 u8 *pos;
75 struct ieee80211_supported_band *sband;
76 union iwreq_data wrqu;
77
78 if (local->ops->reset_tsf) {
79 /* Reset own TSF to allow time synchronization work. */
80 local->ops->reset_tsf(local_to_hw(local));
81 }
82
83 if ((ifibss->flags & IEEE80211_IBSS_PREV_BSSID_SET) &&
84 memcmp(ifibss->bssid, bssid, ETH_ALEN) == 0)
85 return res;
86
87 skb = dev_alloc_skb(local->hw.extra_tx_headroom + 400);
88 if (!skb) {
89 printk(KERN_DEBUG "%s: failed to allocate buffer for probe "
90 "response\n", sdata->dev->name);
91 return -ENOMEM;
92 }
93
94 if (!(ifibss->flags & IEEE80211_IBSS_PREV_BSSID_SET)) {
95 /* Remove possible STA entries from other IBSS networks. */
96 sta_info_flush_delayed(sdata);
97 }
98
99 memcpy(ifibss->bssid, bssid, ETH_ALEN);
100 res = ieee80211_if_config(sdata, IEEE80211_IFCC_BSSID);
101 if (res)
102 return res;
103
104 local->hw.conf.beacon_int = beacon_int >= 10 ? beacon_int : 10;
105
106 sdata->drop_unencrypted = capability &
107 WLAN_CAPABILITY_PRIVACY ? 1 : 0;
108
109 res = ieee80211_set_freq(sdata, freq);
110
111 if (res)
112 return res;
113
114 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
115
116 /* Build IBSS probe response */
117
118 skb_reserve(skb, local->hw.extra_tx_headroom);
119
120 mgmt = (struct ieee80211_mgmt *)
121 skb_put(skb, 24 + sizeof(mgmt->u.beacon));
122 memset(mgmt, 0, 24 + sizeof(mgmt->u.beacon));
123 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
124 IEEE80211_STYPE_PROBE_RESP);
125 memset(mgmt->da, 0xff, ETH_ALEN);
126 memcpy(mgmt->sa, sdata->dev->dev_addr, ETH_ALEN);
127 memcpy(mgmt->bssid, ifibss->bssid, ETH_ALEN);
128 mgmt->u.beacon.beacon_int =
129 cpu_to_le16(local->hw.conf.beacon_int);
130 mgmt->u.beacon.timestamp = cpu_to_le64(tsf);
131 mgmt->u.beacon.capab_info = cpu_to_le16(capability);
132
133 pos = skb_put(skb, 2 + ifibss->ssid_len);
134 *pos++ = WLAN_EID_SSID;
135 *pos++ = ifibss->ssid_len;
136 memcpy(pos, ifibss->ssid, ifibss->ssid_len);
137
138 rates = supp_rates_len;
139 if (rates > 8)
140 rates = 8;
141 pos = skb_put(skb, 2 + rates);
142 *pos++ = WLAN_EID_SUPP_RATES;
143 *pos++ = rates;
144 memcpy(pos, supp_rates, rates);
145
146 if (sband->band == IEEE80211_BAND_2GHZ) {
147 pos = skb_put(skb, 2 + 1);
148 *pos++ = WLAN_EID_DS_PARAMS;
149 *pos++ = 1;
150 *pos++ = ieee80211_frequency_to_channel(freq);
151 }
152
153 pos = skb_put(skb, 2 + 2);
154 *pos++ = WLAN_EID_IBSS_PARAMS;
155 *pos++ = 2;
156 /* FIX: set ATIM window based on scan results */
157 *pos++ = 0;
158 *pos++ = 0;
159
160 if (supp_rates_len > 8) {
161 rates = supp_rates_len - 8;
162 pos = skb_put(skb, 2 + rates);
163 *pos++ = WLAN_EID_EXT_SUPP_RATES;
164 *pos++ = rates;
165 memcpy(pos, &supp_rates[8], rates);
166 }
167
168 ifibss->probe_resp = skb;
169
170 ieee80211_if_config(sdata, IEEE80211_IFCC_BEACON |
171 IEEE80211_IFCC_BEACON_ENABLED);
172
173
174 rates = 0;
175 for (i = 0; i < supp_rates_len; i++) {
176 int bitrate = (supp_rates[i] & 0x7f) * 5;
177 for (j = 0; j < sband->n_bitrates; j++)
178 if (sband->bitrates[j].bitrate == bitrate)
179 rates |= BIT(j);
180 }
181
182 ieee80211_sta_def_wmm_params(sdata, supp_rates_len, supp_rates);
183
184 ifibss->flags |= IEEE80211_IBSS_PREV_BSSID_SET;
185 ifibss->state = IEEE80211_IBSS_MLME_JOINED;
186 mod_timer(&ifibss->timer, jiffies + IEEE80211_IBSS_MERGE_INTERVAL);
187
188 memset(&wrqu, 0, sizeof(wrqu));
189 memcpy(wrqu.ap_addr.sa_data, bssid, ETH_ALEN);
190 wireless_send_event(sdata->dev, SIOCGIWAP, &wrqu, NULL);
191
192 return res;
193}
194
195static int ieee80211_sta_join_ibss(struct ieee80211_sub_if_data *sdata,
196 struct ieee80211_bss *bss)
197{
198 return __ieee80211_sta_join_ibss(sdata,
199 bss->cbss.bssid,
200 bss->cbss.beacon_interval,
201 bss->cbss.channel->center_freq,
202 bss->supp_rates_len, bss->supp_rates,
203 bss->cbss.capability,
204 bss->cbss.tsf);
205}
206
207static void ieee80211_rx_bss_info(struct ieee80211_sub_if_data *sdata,
208 struct ieee80211_mgmt *mgmt,
209 size_t len,
210 struct ieee80211_rx_status *rx_status,
211 struct ieee802_11_elems *elems,
212 bool beacon)
213{
214 struct ieee80211_local *local = sdata->local;
215 int freq;
216 struct ieee80211_bss *bss;
217 struct sta_info *sta;
218 struct ieee80211_channel *channel;
219 u64 beacon_timestamp, rx_timestamp;
220 u32 supp_rates = 0;
221 enum ieee80211_band band = rx_status->band;
222
223 if (elems->ds_params && elems->ds_params_len == 1)
224 freq = ieee80211_channel_to_frequency(elems->ds_params[0]);
225 else
226 freq = rx_status->freq;
227
228 channel = ieee80211_get_channel(local->hw.wiphy, freq);
229
230 if (!channel || channel->flags & IEEE80211_CHAN_DISABLED)
231 return;
232
233 if (sdata->vif.type == NL80211_IFTYPE_ADHOC && elems->supp_rates &&
234 memcmp(mgmt->bssid, sdata->u.ibss.bssid, ETH_ALEN) == 0) {
235 supp_rates = ieee80211_sta_get_rates(local, elems, band);
236
237 rcu_read_lock();
238
239 sta = sta_info_get(local, mgmt->sa);
240 if (sta) {
241 u32 prev_rates;
242
243 prev_rates = sta->sta.supp_rates[band];
244 /* make sure mandatory rates are always added */
245 sta->sta.supp_rates[band] = supp_rates |
246 ieee80211_mandatory_rates(local, band);
247
248#ifdef CONFIG_MAC80211_IBSS_DEBUG
249 if (sta->sta.supp_rates[band] != prev_rates)
250 printk(KERN_DEBUG "%s: updated supp_rates set "
251 "for %pM based on beacon info (0x%llx | "
252 "0x%llx -> 0x%llx)\n",
253 sdata->dev->name,
254 sta->sta.addr,
255 (unsigned long long) prev_rates,
256 (unsigned long long) supp_rates,
257 (unsigned long long) sta->sta.supp_rates[band]);
258#endif
259 } else
260 ieee80211_ibss_add_sta(sdata, mgmt->bssid, mgmt->sa, supp_rates);
261
262 rcu_read_unlock();
263 }
264
265 bss = ieee80211_bss_info_update(local, rx_status, mgmt, len, elems,
266 channel, beacon);
267 if (!bss)
268 return;
269
270 /* was just updated in ieee80211_bss_info_update */
271 beacon_timestamp = bss->cbss.tsf;
272
273 /* check if we need to merge IBSS */
274
275 /* merge only on beacons (???) */
276 if (!beacon)
277 goto put_bss;
278
279 /* we use a fixed BSSID */
280 if (sdata->u.ibss.flags & IEEE80211_IBSS_BSSID_SET)
281 goto put_bss;
282
283 /* not an IBSS */
284 if (!(bss->cbss.capability & WLAN_CAPABILITY_IBSS))
285 goto put_bss;
286
287 /* different channel */
288 if (bss->cbss.channel != local->oper_channel)
289 goto put_bss;
290
291 /* different SSID */
292 if (elems->ssid_len != sdata->u.ibss.ssid_len ||
293 memcmp(elems->ssid, sdata->u.ibss.ssid,
294 sdata->u.ibss.ssid_len))
295 goto put_bss;
296
297 /* same BSSID */
298 if (memcmp(bss->cbss.bssid, sdata->u.ibss.bssid, ETH_ALEN) == 0)
299 goto put_bss;
300
301 if (rx_status->flag & RX_FLAG_TSFT) {
302 /*
303 * For correct IBSS merging we need mactime; since mactime is
304 * defined as the time the first data symbol of the frame hits
305 * the PHY, and the timestamp of the beacon is defined as "the
306 * time that the data symbol containing the first bit of the
307 * timestamp is transmitted to the PHY plus the transmitting
308 * STA's delays through its local PHY from the MAC-PHY
309 * interface to its interface with the WM" (802.11 11.1.2)
310 * - equals the time this bit arrives at the receiver - we have
311 * to take into account the offset between the two.
312 *
313 * E.g. at 1 MBit that means mactime is 192 usec earlier
314 * (=24 bytes * 8 usecs/byte) than the beacon timestamp.
315 */
316 int rate;
317
318 if (rx_status->flag & RX_FLAG_HT)
319 rate = 65; /* TODO: HT rates */
320 else
321 rate = local->hw.wiphy->bands[band]->
322 bitrates[rx_status->rate_idx].bitrate;
323
324 rx_timestamp = rx_status->mactime + (24 * 8 * 10 / rate);
325 } else if (local && local->ops && local->ops->get_tsf)
326 /* second best option: get current TSF */
327 rx_timestamp = local->ops->get_tsf(local_to_hw(local));
328 else
329 /* can't merge without knowing the TSF */
330 rx_timestamp = -1LLU;
331
332#ifdef CONFIG_MAC80211_IBSS_DEBUG
333 printk(KERN_DEBUG "RX beacon SA=%pM BSSID="
334 "%pM TSF=0x%llx BCN=0x%llx diff=%lld @%lu\n",
335 mgmt->sa, mgmt->bssid,
336 (unsigned long long)rx_timestamp,
337 (unsigned long long)beacon_timestamp,
338 (unsigned long long)(rx_timestamp - beacon_timestamp),
339 jiffies);
340#endif
341
342 /* give slow hardware some time to do the TSF sync */
343 if (rx_timestamp < IEEE80211_IBSS_MERGE_DELAY)
344 goto put_bss;
345
346 if (beacon_timestamp > rx_timestamp) {
347#ifdef CONFIG_MAC80211_IBSS_DEBUG
348 printk(KERN_DEBUG "%s: beacon TSF higher than "
349 "local TSF - IBSS merge with BSSID %pM\n",
350 sdata->dev->name, mgmt->bssid);
351#endif
352 ieee80211_sta_join_ibss(sdata, bss);
353 ieee80211_ibss_add_sta(sdata, mgmt->bssid, mgmt->sa, supp_rates);
354 }
355
356 put_bss:
357 ieee80211_rx_bss_put(local, bss);
358}
359
360/*
361 * Add a new IBSS station, will also be called by the RX code when,
362 * in IBSS mode, receiving a frame from a yet-unknown station, hence
363 * must be callable in atomic context.
364 */
365struct sta_info *ieee80211_ibss_add_sta(struct ieee80211_sub_if_data *sdata,
366 u8 *bssid,u8 *addr, u32 supp_rates)
367{
368 struct ieee80211_local *local = sdata->local;
369 struct sta_info *sta;
370 int band = local->hw.conf.channel->band;
371
372 /* TODO: Could consider removing the least recently used entry and
373 * allow new one to be added. */
374 if (local->num_sta >= IEEE80211_IBSS_MAX_STA_ENTRIES) {
375 if (net_ratelimit()) {
376 printk(KERN_DEBUG "%s: No room for a new IBSS STA "
377 "entry %pM\n", sdata->dev->name, addr);
378 }
379 return NULL;
380 }
381
382 if (compare_ether_addr(bssid, sdata->u.ibss.bssid))
383 return NULL;
384
385#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
386 printk(KERN_DEBUG "%s: Adding new IBSS station %pM (dev=%s)\n",
387 wiphy_name(local->hw.wiphy), addr, sdata->dev->name);
388#endif
389
390 sta = sta_info_alloc(sdata, addr, GFP_ATOMIC);
391 if (!sta)
392 return NULL;
393
394 set_sta_flags(sta, WLAN_STA_AUTHORIZED);
395
396 /* make sure mandatory rates are always added */
397 sta->sta.supp_rates[band] = supp_rates |
398 ieee80211_mandatory_rates(local, band);
399
400 rate_control_rate_init(sta);
401
402 if (sta_info_insert(sta))
403 return NULL;
404
405 return sta;
406}
407
408static int ieee80211_sta_active_ibss(struct ieee80211_sub_if_data *sdata)
409{
410 struct ieee80211_local *local = sdata->local;
411 int active = 0;
412 struct sta_info *sta;
413
414 rcu_read_lock();
415
416 list_for_each_entry_rcu(sta, &local->sta_list, list) {
417 if (sta->sdata == sdata &&
418 time_after(sta->last_rx + IEEE80211_IBSS_MERGE_INTERVAL,
419 jiffies)) {
420 active++;
421 break;
422 }
423 }
424
425 rcu_read_unlock();
426
427 return active;
428}
429
430
431static void ieee80211_sta_merge_ibss(struct ieee80211_sub_if_data *sdata)
432{
433 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
434
435 mod_timer(&ifibss->timer, jiffies + IEEE80211_IBSS_MERGE_INTERVAL);
436
437 ieee80211_sta_expire(sdata, IEEE80211_IBSS_INACTIVITY_LIMIT);
438 if (ieee80211_sta_active_ibss(sdata))
439 return;
440
441 if ((ifibss->flags & IEEE80211_IBSS_BSSID_SET) &&
442 (!(ifibss->flags & IEEE80211_IBSS_AUTO_CHANNEL_SEL)))
443 return;
444
445 printk(KERN_DEBUG "%s: No active IBSS STAs - trying to scan for other "
446 "IBSS networks with same SSID (merge)\n", sdata->dev->name);
447
448 /* XXX maybe racy? */
449 if (sdata->local->scan_req)
450 return;
451
452 memcpy(sdata->local->int_scan_req.ssids[0].ssid,
453 ifibss->ssid, IEEE80211_MAX_SSID_LEN);
454 sdata->local->int_scan_req.ssids[0].ssid_len = ifibss->ssid_len;
455 ieee80211_request_scan(sdata, &sdata->local->int_scan_req);
456}
457
458static int ieee80211_sta_create_ibss(struct ieee80211_sub_if_data *sdata)
459{
460 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
461 struct ieee80211_local *local = sdata->local;
462 struct ieee80211_supported_band *sband;
463 u8 *pos;
464 u8 bssid[ETH_ALEN];
465 u8 supp_rates[IEEE80211_MAX_SUPP_RATES];
466 u16 capability;
467 int i;
468
469 if (ifibss->flags & IEEE80211_IBSS_BSSID_SET) {
470 memcpy(bssid, ifibss->bssid, ETH_ALEN);
471 } else {
472 /* Generate random, not broadcast, locally administered BSSID. Mix in
473 * own MAC address to make sure that devices that do not have proper
474 * random number generator get different BSSID. */
475 get_random_bytes(bssid, ETH_ALEN);
476 for (i = 0; i < ETH_ALEN; i++)
477 bssid[i] ^= sdata->dev->dev_addr[i];
478 bssid[0] &= ~0x01;
479 bssid[0] |= 0x02;
480 }
481
482 printk(KERN_DEBUG "%s: Creating new IBSS network, BSSID %pM\n",
483 sdata->dev->name, bssid);
484
485 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
486
487 if (local->hw.conf.beacon_int == 0)
488 local->hw.conf.beacon_int = 100;
489
490 capability = WLAN_CAPABILITY_IBSS;
491
492 if (sdata->default_key)
493 capability |= WLAN_CAPABILITY_PRIVACY;
494 else
495 sdata->drop_unencrypted = 0;
496
497 pos = supp_rates;
498 for (i = 0; i < sband->n_bitrates; i++) {
499 int rate = sband->bitrates[i].bitrate;
500 *pos++ = (u8) (rate / 5);
501 }
502
503 return __ieee80211_sta_join_ibss(sdata,
504 bssid, local->hw.conf.beacon_int,
505 local->hw.conf.channel->center_freq,
506 sband->n_bitrates, supp_rates,
507 capability, 0);
508}
509
510static int ieee80211_sta_find_ibss(struct ieee80211_sub_if_data *sdata)
511{
512 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
513 struct ieee80211_local *local = sdata->local;
514 struct ieee80211_bss *bss;
515 const u8 *bssid = NULL;
516 int active_ibss;
517
518 if (ifibss->ssid_len == 0)
519 return -EINVAL;
520
521 active_ibss = ieee80211_sta_active_ibss(sdata);
522#ifdef CONFIG_MAC80211_IBSS_DEBUG
523 printk(KERN_DEBUG "%s: sta_find_ibss (active_ibss=%d)\n",
524 sdata->dev->name, active_ibss);
525#endif /* CONFIG_MAC80211_IBSS_DEBUG */
526
527 if (active_ibss)
528 return 0;
529
530 if (ifibss->flags & IEEE80211_IBSS_BSSID_SET)
531 bssid = ifibss->bssid;
532 bss = (void *)cfg80211_get_bss(local->hw.wiphy, NULL, bssid,
533 ifibss->ssid, ifibss->ssid_len,
534 WLAN_CAPABILITY_IBSS,
535 WLAN_CAPABILITY_IBSS);
536
537#ifdef CONFIG_MAC80211_IBSS_DEBUG
538 if (bss)
539 printk(KERN_DEBUG " sta_find_ibss: selected %pM current "
540 "%pM\n", bss->cbss.bssid, ifibss->bssid);
541#endif /* CONFIG_MAC80211_IBSS_DEBUG */
542
543 if (bss &&
544 (!(ifibss->flags & IEEE80211_IBSS_PREV_BSSID_SET) ||
545 memcmp(ifibss->bssid, bss->cbss.bssid, ETH_ALEN))) {
546 int ret;
547
548 printk(KERN_DEBUG "%s: Selected IBSS BSSID %pM"
549 " based on configured SSID\n",
550 sdata->dev->name, bss->cbss.bssid);
551
552 ret = ieee80211_sta_join_ibss(sdata, bss);
553 ieee80211_rx_bss_put(local, bss);
554 return ret;
555 } else if (bss)
556 ieee80211_rx_bss_put(local, bss);
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)) {
565 mod_timer(&ifibss->timer, jiffies +
566 IEEE80211_IBSS_MERGE_INTERVAL);
567 } else if (time_after(jiffies, local->last_scan_completed +
568 IEEE80211_SCAN_INTERVAL)) {
569 printk(KERN_DEBUG "%s: Trigger new scan to find an IBSS to "
570 "join\n", sdata->dev->name);
571
572 /* XXX maybe racy? */
573 if (local->scan_req)
574 return -EBUSY;
575
576 memcpy(local->int_scan_req.ssids[0].ssid,
577 ifibss->ssid, IEEE80211_MAX_SSID_LEN);
578 local->int_scan_req.ssids[0].ssid_len = ifibss->ssid_len;
579 return ieee80211_request_scan(sdata, &local->int_scan_req);
580 } else if (ifibss->state != IEEE80211_IBSS_MLME_JOINED) {
581 int interval = IEEE80211_SCAN_INTERVAL;
582
583 if (time_after(jiffies, ifibss->ibss_join_req +
584 IEEE80211_IBSS_JOIN_TIMEOUT)) {
585 if (!(local->oper_channel->flags &
586 IEEE80211_CHAN_NO_IBSS))
587 return ieee80211_sta_create_ibss(sdata);
588 printk(KERN_DEBUG "%s: IBSS not allowed on"
589 " %d MHz\n", sdata->dev->name,
590 local->hw.conf.channel->center_freq);
591
592 /* No IBSS found - decrease scan interval and continue
593 * scanning. */
594 interval = IEEE80211_SCAN_INTERVAL_SLOW;
595 }
596
597 ifibss->state = IEEE80211_IBSS_MLME_SEARCH;
598 mod_timer(&ifibss->timer, jiffies + interval);
599 return 0;
600 }
601
602 return 0;
603}
604
605static void ieee80211_rx_mgmt_probe_req(struct ieee80211_sub_if_data *sdata,
606 struct ieee80211_mgmt *mgmt,
607 size_t len)
608{
609 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
610 struct ieee80211_local *local = sdata->local;
611 int tx_last_beacon;
612 struct sk_buff *skb;
613 struct ieee80211_mgmt *resp;
614 u8 *pos, *end;
615
616 if (ifibss->state != IEEE80211_IBSS_MLME_JOINED ||
617 len < 24 + 2 || !ifibss->probe_resp)
618 return;
619
620 if (local->ops->tx_last_beacon)
621 tx_last_beacon = local->ops->tx_last_beacon(local_to_hw(local));
622 else
623 tx_last_beacon = 1;
624
625#ifdef CONFIG_MAC80211_IBSS_DEBUG
626 printk(KERN_DEBUG "%s: RX ProbeReq SA=%pM DA=%pM BSSID=%pM"
627 " (tx_last_beacon=%d)\n",
628 sdata->dev->name, mgmt->sa, mgmt->da,
629 mgmt->bssid, tx_last_beacon);
630#endif /* CONFIG_MAC80211_IBSS_DEBUG */
631
632 if (!tx_last_beacon)
633 return;
634
635 if (memcmp(mgmt->bssid, ifibss->bssid, ETH_ALEN) != 0 &&
636 memcmp(mgmt->bssid, "\xff\xff\xff\xff\xff\xff", ETH_ALEN) != 0)
637 return;
638
639 end = ((u8 *) mgmt) + len;
640 pos = mgmt->u.probe_req.variable;
641 if (pos[0] != WLAN_EID_SSID ||
642 pos + 2 + pos[1] > end) {
643#ifdef CONFIG_MAC80211_IBSS_DEBUG
644 printk(KERN_DEBUG "%s: Invalid SSID IE in ProbeReq "
645 "from %pM\n",
646 sdata->dev->name, mgmt->sa);
647#endif
648 return;
649 }
650 if (pos[1] != 0 &&
651 (pos[1] != ifibss->ssid_len ||
652 memcmp(pos + 2, ifibss->ssid, ifibss->ssid_len) != 0)) {
653 /* Ignore ProbeReq for foreign SSID */
654 return;
655 }
656
657 /* Reply with ProbeResp */
658 skb = skb_copy(ifibss->probe_resp, GFP_KERNEL);
659 if (!skb)
660 return;
661
662 resp = (struct ieee80211_mgmt *) skb->data;
663 memcpy(resp->da, mgmt->sa, ETH_ALEN);
664#ifdef CONFIG_MAC80211_IBSS_DEBUG
665 printk(KERN_DEBUG "%s: Sending ProbeResp to %pM\n",
666 sdata->dev->name, resp->da);
667#endif /* CONFIG_MAC80211_IBSS_DEBUG */
668 ieee80211_tx_skb(sdata, skb, 0);
669}
670
671static void ieee80211_rx_mgmt_probe_resp(struct ieee80211_sub_if_data *sdata,
672 struct ieee80211_mgmt *mgmt,
673 size_t len,
674 struct ieee80211_rx_status *rx_status)
675{
676 size_t baselen;
677 struct ieee802_11_elems elems;
678
679 if (memcmp(mgmt->da, sdata->dev->dev_addr, ETH_ALEN))
680 return; /* ignore ProbeResp to foreign address */
681
682 baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt;
683 if (baselen > len)
684 return;
685
686 ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen,
687 &elems);
688
689 ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems, false);
690}
691
692static void ieee80211_rx_mgmt_beacon(struct ieee80211_sub_if_data *sdata,
693 struct ieee80211_mgmt *mgmt,
694 size_t len,
695 struct ieee80211_rx_status *rx_status)
696{
697 size_t baselen;
698 struct ieee802_11_elems elems;
699
700 /* Process beacon from the current BSS */
701 baselen = (u8 *) mgmt->u.beacon.variable - (u8 *) mgmt;
702 if (baselen > len)
703 return;
704
705 ieee802_11_parse_elems(mgmt->u.beacon.variable, len - baselen, &elems);
706
707 ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems, true);
708}
709
710static void ieee80211_ibss_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata,
711 struct sk_buff *skb)
712{
713 struct ieee80211_rx_status *rx_status;
714 struct ieee80211_mgmt *mgmt;
715 u16 fc;
716
717 rx_status = (struct ieee80211_rx_status *) skb->cb;
718 mgmt = (struct ieee80211_mgmt *) skb->data;
719 fc = le16_to_cpu(mgmt->frame_control);
720
721 switch (fc & IEEE80211_FCTL_STYPE) {
722 case IEEE80211_STYPE_PROBE_REQ:
723 ieee80211_rx_mgmt_probe_req(sdata, mgmt, skb->len);
724 break;
725 case IEEE80211_STYPE_PROBE_RESP:
726 ieee80211_rx_mgmt_probe_resp(sdata, mgmt, skb->len,
727 rx_status);
728 break;
729 case IEEE80211_STYPE_BEACON:
730 ieee80211_rx_mgmt_beacon(sdata, mgmt, skb->len,
731 rx_status);
732 break;
733 case IEEE80211_STYPE_AUTH:
734 ieee80211_rx_mgmt_auth_ibss(sdata, mgmt, skb->len);
735 break;
736 }
737
738 kfree_skb(skb);
739}
740
741static void ieee80211_ibss_work(struct work_struct *work)
742{
743 struct ieee80211_sub_if_data *sdata =
744 container_of(work, struct ieee80211_sub_if_data, u.ibss.work);
745 struct ieee80211_local *local = sdata->local;
746 struct ieee80211_if_ibss *ifibss;
747 struct sk_buff *skb;
748
749 if (!netif_running(sdata->dev))
750 return;
751
752 if (local->sw_scanning || local->hw_scanning)
753 return;
754
755 if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_ADHOC))
756 return;
757 ifibss = &sdata->u.ibss;
758
759 while ((skb = skb_dequeue(&ifibss->skb_queue)))
760 ieee80211_ibss_rx_queued_mgmt(sdata, skb);
761
762 if (!test_and_clear_bit(IEEE80211_IBSS_REQ_RUN, &ifibss->request))
763 return;
764
765 switch (ifibss->state) {
766 case IEEE80211_IBSS_MLME_SEARCH:
767 ieee80211_sta_find_ibss(sdata);
768 break;
769 case IEEE80211_IBSS_MLME_JOINED:
770 ieee80211_sta_merge_ibss(sdata);
771 break;
772 default:
773 WARN_ON(1);
774 break;
775 }
776}
777
778static void ieee80211_ibss_timer(unsigned long data)
779{
780 struct ieee80211_sub_if_data *sdata =
781 (struct ieee80211_sub_if_data *) data;
782 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
783 struct ieee80211_local *local = sdata->local;
784
785 set_bit(IEEE80211_IBSS_REQ_RUN, &ifibss->request);
786 queue_work(local->hw.workqueue, &ifibss->work);
787}
788
789void ieee80211_ibss_setup_sdata(struct ieee80211_sub_if_data *sdata)
790{
791 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
792
793 INIT_WORK(&ifibss->work, ieee80211_ibss_work);
794 setup_timer(&ifibss->timer, ieee80211_ibss_timer,
795 (unsigned long) sdata);
796 skb_queue_head_init(&ifibss->skb_queue);
797
798 ifibss->flags |= IEEE80211_IBSS_AUTO_BSSID_SEL |
799 IEEE80211_IBSS_AUTO_CHANNEL_SEL;
800}
801
802int ieee80211_ibss_commit(struct ieee80211_sub_if_data *sdata)
803{
804 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
805
806 ifibss->flags &= ~IEEE80211_IBSS_PREV_BSSID_SET;
807
808 if (ifibss->ssid_len)
809 ifibss->flags |= IEEE80211_IBSS_SSID_SET;
810 else
811 ifibss->flags &= ~IEEE80211_IBSS_SSID_SET;
812
813 ifibss->ibss_join_req = jiffies;
814 ifibss->state = IEEE80211_IBSS_MLME_SEARCH;
815 set_bit(IEEE80211_IBSS_REQ_RUN, &ifibss->request);
816
817 return 0;
818}
819
820int ieee80211_ibss_set_ssid(struct ieee80211_sub_if_data *sdata, char *ssid, size_t len)
821{
822 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
823
824 if (len > IEEE80211_MAX_SSID_LEN)
825 return -EINVAL;
826
827 if (ifibss->ssid_len != len || memcmp(ifibss->ssid, ssid, len) != 0) {
828 memset(ifibss->ssid, 0, sizeof(ifibss->ssid));
829 memcpy(ifibss->ssid, ssid, len);
830 ifibss->ssid_len = len;
831 }
832
833 return ieee80211_ibss_commit(sdata);
834}
835
836int ieee80211_ibss_get_ssid(struct ieee80211_sub_if_data *sdata, char *ssid, size_t *len)
837{
838 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
839
840 memcpy(ssid, ifibss->ssid, ifibss->ssid_len);
841 *len = ifibss->ssid_len;
842
843 return 0;
844}
845
846int ieee80211_ibss_set_bssid(struct ieee80211_sub_if_data *sdata, u8 *bssid)
847{
848 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
849
850 if (is_valid_ether_addr(bssid)) {
851 memcpy(ifibss->bssid, bssid, ETH_ALEN);
852 ifibss->flags |= IEEE80211_IBSS_BSSID_SET;
853 } else {
854 memset(ifibss->bssid, 0, ETH_ALEN);
855 ifibss->flags &= ~IEEE80211_IBSS_BSSID_SET;
856 }
857
858 if (netif_running(sdata->dev)) {
859 if (ieee80211_if_config(sdata, IEEE80211_IFCC_BSSID)) {
860 printk(KERN_DEBUG "%s: Failed to config new BSSID to "
861 "the low-level driver\n", sdata->dev->name);
862 }
863 }
864
865 return ieee80211_ibss_commit(sdata);
866}
867
868/* scan finished notification */
869void ieee80211_ibss_notify_scan_completed(struct ieee80211_local *local)
870{
871 struct ieee80211_sub_if_data *sdata = local->scan_sdata;
872 struct ieee80211_if_ibss *ifibss;
873
874 if (sdata && sdata->vif.type == NL80211_IFTYPE_ADHOC) {
875 ifibss = &sdata->u.ibss;
876 if ((!(ifibss->flags & IEEE80211_IBSS_PREV_BSSID_SET)) ||
877 !ieee80211_sta_active_ibss(sdata))
878 ieee80211_sta_find_ibss(sdata);
879 }
880}
881
882ieee80211_rx_result
883ieee80211_ibss_rx_mgmt(struct ieee80211_sub_if_data *sdata, struct sk_buff *skb,
884 struct ieee80211_rx_status *rx_status)
885{
886 struct ieee80211_local *local = sdata->local;
887 struct ieee80211_mgmt *mgmt;
888 u16 fc;
889
890 if (skb->len < 24)
891 return RX_DROP_MONITOR;
892
893 mgmt = (struct ieee80211_mgmt *) skb->data;
894 fc = le16_to_cpu(mgmt->frame_control);
895
896 switch (fc & IEEE80211_FCTL_STYPE) {
897 case IEEE80211_STYPE_PROBE_RESP:
898 case IEEE80211_STYPE_BEACON:
899 memcpy(skb->cb, rx_status, sizeof(*rx_status));
900 case IEEE80211_STYPE_PROBE_REQ:
901 case IEEE80211_STYPE_AUTH:
902 skb_queue_tail(&sdata->u.ibss.skb_queue, skb);
903 queue_work(local->hw.workqueue, &sdata->u.ibss.work);
904 return RX_QUEUED;
905 }
906
907 return RX_DROP_MONITOR;
908}
generated by cgit v1.2.2 (git 2.25.0) at 2025-01-12 02:42:33 -0500