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nl80211: introduce new key attributes
[deliverable/linux.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,
60 sdata->u.ibss.bssid, 0);
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;
57c4d7b4 76 u32 bss_change;
b59066a2 77 u8 supp_rates[IEEE80211_MAX_SUPP_RATES];
24487981
JB		 78
79 /* Reset own TSF to allow time synchronization work. */
80 drv_reset_tsf(local);
46900298 81
af8cdcd8
JB		 82 skb = ifibss->skb;
83 rcu_assign_pointer(ifibss->presp, NULL);
84 synchronize_rcu();
85 skb->data = skb->head;
86 skb->len = 0;
87 skb_reset_tail_pointer(skb);
88 skb_reserve(skb, sdata->local->hw.extra_tx_headroom);
46900298 89
af8cdcd8
JB		 90 if (memcmp(ifibss->bssid, bssid, ETH_ALEN))
91 sta_info_flush(sdata->local, sdata);
46900298
JB		 92
93 memcpy(ifibss->bssid, bssid, ETH_ALEN);
46900298 94
af8cdcd8 95 sdata->drop_unencrypted = capability & WLAN_CAPABILITY_PRIVACY ? 1 : 0;
46900298 96
af8cdcd8
JB		 97 local->oper_channel = chan;
98 local->oper_channel_type = NL80211_CHAN_NO_HT;
99 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_CHANNEL);
57c4d7b4 100
af8cdcd8 101 sband = local->hw.wiphy->bands[chan->band];
46900298 102
b59066a2
JB		 103 /* build supported rates array */
104 pos = supp_rates;
105 for (i = 0; i < sband->n_bitrates; i++) {
106 int rate = sband->bitrates[i].bitrate;
107 u8 basic = 0;
108 if (basic_rates & BIT(i))
109 basic = 0x80;
110 *pos++ = basic | (u8) (rate / 5);
111 }
112
46900298 113 /* Build IBSS probe response */
af8cdcd8 114 mgmt = (void *) skb_put(skb, 24 + sizeof(mgmt->u.beacon));
46900298
JB		 115 memset(mgmt, 0, 24 + sizeof(mgmt->u.beacon));
116 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
117 IEEE80211_STYPE_PROBE_RESP);
118 memset(mgmt->da, 0xff, ETH_ALEN);
119 memcpy(mgmt->sa, sdata->dev->dev_addr, ETH_ALEN);
120 memcpy(mgmt->bssid, ifibss->bssid, ETH_ALEN);
57c4d7b4 121 mgmt->u.beacon.beacon_int = cpu_to_le16(beacon_int);
707c1b4e 122 mgmt->u.beacon.timestamp = cpu_to_le64(tsf);
46900298
JB		 123 mgmt->u.beacon.capab_info = cpu_to_le16(capability);
124
125 pos = skb_put(skb, 2 + ifibss->ssid_len);
126 *pos++ = WLAN_EID_SSID;
127 *pos++ = ifibss->ssid_len;
128 memcpy(pos, ifibss->ssid, ifibss->ssid_len);
129
b59066a2 130 rates = sband->n_bitrates;
46900298
JB		 131 if (rates > 8)
132 rates = 8;
133 pos = skb_put(skb, 2 + rates);
134 *pos++ = WLAN_EID_SUPP_RATES;
135 *pos++ = rates;
136 memcpy(pos, supp_rates, rates);
137
138 if (sband->band == IEEE80211_BAND_2GHZ) {
139 pos = skb_put(skb, 2 + 1);
140 *pos++ = WLAN_EID_DS_PARAMS;
141 *pos++ = 1;
af8cdcd8 142 *pos++ = ieee80211_frequency_to_channel(chan->center_freq);
46900298
JB		 143 }
144
145 pos = skb_put(skb, 2 + 2);
146 *pos++ = WLAN_EID_IBSS_PARAMS;
147 *pos++ = 2;
148 /* FIX: set ATIM window based on scan results */
149 *pos++ = 0;
150 *pos++ = 0;
151
b59066a2
JB		 152 if (sband->n_bitrates > 8) {
153 rates = sband->n_bitrates - 8;
46900298
JB		 154 pos = skb_put(skb, 2 + rates);
155 *pos++ = WLAN_EID_EXT_SUPP_RATES;
156 *pos++ = rates;
157 memcpy(pos, &supp_rates[8], rates);
158 }
159
af8cdcd8
JB		 160 if (ifibss->ie_len)
161 memcpy(skb_put(skb, ifibss->ie_len),
162 ifibss->ie, ifibss->ie_len);
163
164 rcu_assign_pointer(ifibss->presp, skb);
46900298 165
2d0ddec5
JB		 166 sdata->vif.bss_conf.beacon_int = beacon_int;
167 bss_change = BSS_CHANGED_BEACON_INT;
168 bss_change |= ieee80211_reset_erp_info(sdata);
169 bss_change |= BSS_CHANGED_BSSID;
170 bss_change |= BSS_CHANGED_BEACON;
171 bss_change |= BSS_CHANGED_BEACON_ENABLED;
172 ieee80211_bss_info_change_notify(sdata, bss_change);
46900298 173
b59066a2 174 ieee80211_sta_def_wmm_params(sdata, sband->n_bitrates, supp_rates);
46900298 175
46900298 176 ifibss->state = IEEE80211_IBSS_MLME_JOINED;
af8cdcd8
JB		 177 mod_timer(&ifibss->timer,
178 round_jiffies(jiffies + IEEE80211_IBSS_MERGE_INTERVAL));
46900298 179
af8cdcd8
JB		 180 cfg80211_inform_bss_frame(local->hw.wiphy, local->hw.conf.channel,
181 mgmt, skb->len, 0, GFP_KERNEL);
182 cfg80211_ibss_joined(sdata->dev, ifibss->bssid, GFP_KERNEL);
46900298
JB		 183}
184
af8cdcd8
JB		 185static void ieee80211_sta_join_ibss(struct ieee80211_sub_if_data *sdata,
186 struct ieee80211_bss *bss)
46900298 187{
b59066a2
JB		 188 struct ieee80211_supported_band *sband;
189 u32 basic_rates;
190 int i, j;
57c4d7b4
JB		 191 u16 beacon_int = bss->cbss.beacon_interval;
192
193 if (beacon_int < 10)
194 beacon_int = 10;
195
b59066a2
JB		 196 sband = sdata->local->hw.wiphy->bands[bss->cbss.channel->band];
197
198 basic_rates = 0;
199
200 for (i = 0; i < bss->supp_rates_len; i++) {
201 int rate = (bss->supp_rates[i] & 0x7f) * 5;
202 bool is_basic = !!(bss->supp_rates[i] & 0x80);
203
204 for (j = 0; j < sband->n_bitrates; j++) {
205 if (sband->bitrates[j].bitrate == rate) {
206 if (is_basic)
207 basic_rates |= BIT(j);
208 break;
209 }
210 }
211 }
212
af8cdcd8 213 __ieee80211_sta_join_ibss(sdata, bss->cbss.bssid,
57c4d7b4 214 beacon_int,
af8cdcd8 215 bss->cbss.channel,
b59066a2 216 basic_rates,
af8cdcd8
JB		 217 bss->cbss.capability,
218 bss->cbss.tsf);
46900298
JB		 219}
220
221static void ieee80211_rx_bss_info(struct ieee80211_sub_if_data *sdata,
222 struct ieee80211_mgmt *mgmt,
223 size_t len,
224 struct ieee80211_rx_status *rx_status,
225 struct ieee802_11_elems *elems,
226 bool beacon)
227{
228 struct ieee80211_local *local = sdata->local;
229 int freq;
230 struct ieee80211_bss *bss;
231 struct sta_info *sta;
232 struct ieee80211_channel *channel;
233 u64 beacon_timestamp, rx_timestamp;
234 u32 supp_rates = 0;
235 enum ieee80211_band band = rx_status->band;
236
237 if (elems->ds_params && elems->ds_params_len == 1)
238 freq = ieee80211_channel_to_frequency(elems->ds_params[0]);
239 else
240 freq = rx_status->freq;
241
242 channel = ieee80211_get_channel(local->hw.wiphy, freq);
243
244 if (!channel || channel->flags & IEEE80211_CHAN_DISABLED)
245 return;
246
247 if (sdata->vif.type == NL80211_IFTYPE_ADHOC && elems->supp_rates &&
248 memcmp(mgmt->bssid, sdata->u.ibss.bssid, ETH_ALEN) == 0) {
249 supp_rates = ieee80211_sta_get_rates(local, elems, band);
250
251 rcu_read_lock();
252
253 sta = sta_info_get(local, mgmt->sa);
254 if (sta) {
255 u32 prev_rates;
256
257 prev_rates = sta->sta.supp_rates[band];
258 /* make sure mandatory rates are always added */
259 sta->sta.supp_rates[band] = supp_rates |
260 ieee80211_mandatory_rates(local, band);
261
262#ifdef CONFIG_MAC80211_IBSS_DEBUG
263 if (sta->sta.supp_rates[band] != prev_rates)
264 printk(KERN_DEBUG "%s: updated supp_rates set "
265 "for %pM based on beacon info (0x%llx | "
266 "0x%llx -> 0x%llx)\n",
267 sdata->dev->name,
268 sta->sta.addr,
269 (unsigned long long) prev_rates,
270 (unsigned long long) supp_rates,
271 (unsigned long long) sta->sta.supp_rates[band]);
272#endif
273 } else
274 ieee80211_ibss_add_sta(sdata, mgmt->bssid, mgmt->sa, supp_rates);
275
276 rcu_read_unlock();
277 }
278
279 bss = ieee80211_bss_info_update(local, rx_status, mgmt, len, elems,
280 channel, beacon);
281 if (!bss)
282 return;
283
284 /* was just updated in ieee80211_bss_info_update */
285 beacon_timestamp = bss->cbss.tsf;
286
287 /* check if we need to merge IBSS */
288
289 /* merge only on beacons (???) */
290 if (!beacon)
291 goto put_bss;
292
293 /* we use a fixed BSSID */
af8cdcd8 294 if (sdata->u.ibss.bssid)
46900298
JB		 295 goto put_bss;
296
297 /* not an IBSS */
298 if (!(bss->cbss.capability & WLAN_CAPABILITY_IBSS))
299 goto put_bss;
300
301 /* different channel */
302 if (bss->cbss.channel != local->oper_channel)
303 goto put_bss;
304
305 /* different SSID */
306 if (elems->ssid_len != sdata->u.ibss.ssid_len ||
307 memcmp(elems->ssid, sdata->u.ibss.ssid,
308 sdata->u.ibss.ssid_len))
309 goto put_bss;
310
34e8f082
AF		 311 /* same BSSID */
312 if (memcmp(bss->cbss.bssid, sdata->u.ibss.bssid, ETH_ALEN) == 0)
313 goto put_bss;
314
46900298
JB		 315 if (rx_status->flag & RX_FLAG_TSFT) {
316 /*
317 * For correct IBSS merging we need mactime; since mactime is
318 * defined as the time the first data symbol of the frame hits
319 * the PHY, and the timestamp of the beacon is defined as "the
320 * time that the data symbol containing the first bit of the
321 * timestamp is transmitted to the PHY plus the transmitting
322 * STA's delays through its local PHY from the MAC-PHY
323 * interface to its interface with the WM" (802.11 11.1.2)
324 * - equals the time this bit arrives at the receiver - we have
325 * to take into account the offset between the two.
326 *
327 * E.g. at 1 MBit that means mactime is 192 usec earlier
328 * (=24 bytes * 8 usecs/byte) than the beacon timestamp.
329 */
330 int rate;
331
332 if (rx_status->flag & RX_FLAG_HT)
333 rate = 65; /* TODO: HT rates */
334 else
335 rate = local->hw.wiphy->bands[band]->
336 bitrates[rx_status->rate_idx].bitrate;
337
338 rx_timestamp = rx_status->mactime + (24 * 8 * 10 / rate);
24487981
JB		 339 } else {
340 /*
341 * second best option: get current TSF
342 * (will return -1 if not supported)
343 */
344 rx_timestamp = drv_get_tsf(local);
345 }
46900298
JB		 346
347#ifdef CONFIG_MAC80211_IBSS_DEBUG
348 printk(KERN_DEBUG "RX beacon SA=%pM BSSID="
349 "%pM TSF=0x%llx BCN=0x%llx diff=%lld @%lu\n",
350 mgmt->sa, mgmt->bssid,
351 (unsigned long long)rx_timestamp,
352 (unsigned long long)beacon_timestamp,
353 (unsigned long long)(rx_timestamp - beacon_timestamp),
354 jiffies);
355#endif
356
4a332a38
AF		 357 /* give slow hardware some time to do the TSF sync */
358 if (rx_timestamp < IEEE80211_IBSS_MERGE_DELAY)
359 goto put_bss;
360
46900298
JB		 361 if (beacon_timestamp > rx_timestamp) {
362#ifdef CONFIG_MAC80211_IBSS_DEBUG
363 printk(KERN_DEBUG "%s: beacon TSF higher than "
364 "local TSF - IBSS merge with BSSID %pM\n",
365 sdata->dev->name, mgmt->bssid);
366#endif
367 ieee80211_sta_join_ibss(sdata, bss);
368 ieee80211_ibss_add_sta(sdata, mgmt->bssid, mgmt->sa, supp_rates);
369 }
370
371 put_bss:
372 ieee80211_rx_bss_put(local, bss);
373}
374
375/*
376 * Add a new IBSS station, will also be called by the RX code when,
377 * in IBSS mode, receiving a frame from a yet-unknown station, hence
378 * must be callable in atomic context.
379 */
380struct sta_info *ieee80211_ibss_add_sta(struct ieee80211_sub_if_data *sdata,
381 u8 *bssid,u8 *addr, u32 supp_rates)
382{
383 struct ieee80211_local *local = sdata->local;
384 struct sta_info *sta;
385 int band = local->hw.conf.channel->band;
386
af8cdcd8
JB		 387 /*
388 * XXX: Consider removing the least recently used entry and
389 * allow new one to be added.
390 */
46900298 391 if (local->num_sta >= IEEE80211_IBSS_MAX_STA_ENTRIES) {
af8cdcd8
JB		 392 if (net_ratelimit())
393 printk(KERN_DEBUG "%s: No room for a new IBSS STA entry %pM\n",
394 sdata->dev->name, addr);
46900298
JB		 395 return NULL;
396 }
397
398 if (compare_ether_addr(bssid, sdata->u.ibss.bssid))
399 return NULL;
400
401#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
402 printk(KERN_DEBUG "%s: Adding new IBSS station %pM (dev=%s)\n",
403 wiphy_name(local->hw.wiphy), addr, sdata->dev->name);
404#endif
405
406 sta = sta_info_alloc(sdata, addr, GFP_ATOMIC);
407 if (!sta)
408 return NULL;
409
410 set_sta_flags(sta, WLAN_STA_AUTHORIZED);
411
412 /* make sure mandatory rates are always added */
413 sta->sta.supp_rates[band] = supp_rates |
414 ieee80211_mandatory_rates(local, band);
415
416 rate_control_rate_init(sta);
417
418 if (sta_info_insert(sta))
419 return NULL;
420
421 return sta;
422}
423
424static int ieee80211_sta_active_ibss(struct ieee80211_sub_if_data *sdata)
425{
426 struct ieee80211_local *local = sdata->local;
427 int active = 0;
428 struct sta_info *sta;
429
430 rcu_read_lock();
431
432 list_for_each_entry_rcu(sta, &local->sta_list, list) {
433 if (sta->sdata == sdata &&
434 time_after(sta->last_rx + IEEE80211_IBSS_MERGE_INTERVAL,
435 jiffies)) {
436 active++;
437 break;
438 }
439 }
440
441 rcu_read_unlock();
442
443 return active;
444}
445
446
447static void ieee80211_sta_merge_ibss(struct ieee80211_sub_if_data *sdata)
448{
449 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
450
af8cdcd8
JB		 451 mod_timer(&ifibss->timer,
452 round_jiffies(jiffies + IEEE80211_IBSS_MERGE_INTERVAL));
46900298
JB		 453
454 ieee80211_sta_expire(sdata, IEEE80211_IBSS_INACTIVITY_LIMIT);
af8cdcd8 455
46900298
JB		 456 if (ieee80211_sta_active_ibss(sdata))
457 return;
458
af8cdcd8 459 if (ifibss->fixed_channel)
46900298
JB		 460 return;
461
462 printk(KERN_DEBUG "%s: No active IBSS STAs - trying to scan for other "
463 "IBSS networks with same SSID (merge)\n", sdata->dev->name);
464
f3b85252 465 ieee80211_request_internal_scan(sdata, ifibss->ssid, ifibss->ssid_len);
46900298
JB		 466}
467
af8cdcd8 468static void ieee80211_sta_create_ibss(struct ieee80211_sub_if_data *sdata)
46900298
JB		 469{
470 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
471 struct ieee80211_local *local = sdata->local;
472 struct ieee80211_supported_band *sband;
46900298 473 u8 bssid[ETH_ALEN];
46900298
JB		 474 u16 capability;
475 int i;
476
af8cdcd8 477 if (ifibss->fixed_bssid) {
46900298
JB		 478 memcpy(bssid, ifibss->bssid, ETH_ALEN);
479 } else {
480 /* Generate random, not broadcast, locally administered BSSID. Mix in
481 * own MAC address to make sure that devices that do not have proper
482 * random number generator get different BSSID. */
483 get_random_bytes(bssid, ETH_ALEN);
484 for (i = 0; i < ETH_ALEN; i++)
485 bssid[i] ^= sdata->dev->dev_addr[i];
486 bssid[0] &= ~0x01;
487 bssid[0] |= 0x02;
488 }
489
490 printk(KERN_DEBUG "%s: Creating new IBSS network, BSSID %pM\n",
491 sdata->dev->name, bssid);
492
af8cdcd8 493 sband = local->hw.wiphy->bands[ifibss->channel->band];
46900298 494
46900298
JB		 495 capability = WLAN_CAPABILITY_IBSS;
496
497 if (sdata->default_key)
498 capability |= WLAN_CAPABILITY_PRIVACY;
499 else
500 sdata->drop_unencrypted = 0;
501
57c4d7b4 502 __ieee80211_sta_join_ibss(sdata, bssid, sdata->vif.bss_conf.beacon_int,
b59066a2
JB		 503 ifibss->channel, 3, /* first two are basic */
504 capability, 0);
46900298
JB		 505}
506
af8cdcd8 507static void ieee80211_sta_find_ibss(struct ieee80211_sub_if_data *sdata)
46900298
JB		 508{
509 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
510 struct ieee80211_local *local = sdata->local;
511 struct ieee80211_bss *bss;
af8cdcd8 512 struct ieee80211_channel *chan = NULL;
46900298
JB		 513 const u8 *bssid = NULL;
514 int active_ibss;
e0d61887 515 u16 capability;
46900298 516
46900298
JB		 517 active_ibss = ieee80211_sta_active_ibss(sdata);
518#ifdef CONFIG_MAC80211_IBSS_DEBUG
519 printk(KERN_DEBUG "%s: sta_find_ibss (active_ibss=%d)\n",
520 sdata->dev->name, active_ibss);
521#endif /* CONFIG_MAC80211_IBSS_DEBUG */
522
523 if (active_ibss)
af8cdcd8 524 return;
46900298 525
e0d61887
JB		 526 capability = WLAN_CAPABILITY_IBSS;
527 if (sdata->default_key)
528 capability |= WLAN_CAPABILITY_PRIVACY;
529
af8cdcd8
JB		 530 if (ifibss->fixed_bssid)
531 bssid = ifibss->bssid;
532 if (ifibss->fixed_channel)
533 chan = ifibss->channel;
534 if (!is_zero_ether_addr(ifibss->bssid))
46900298 535 bssid = ifibss->bssid;
af8cdcd8 536 bss = (void *)cfg80211_get_bss(local->hw.wiphy, chan, bssid,
46900298 537 ifibss->ssid, ifibss->ssid_len,
e0d61887 538 WLAN_CAPABILITY_IBSS |
db67645d
JB		 539 WLAN_CAPABILITY_PRIVACY,
540 capability);
46900298
JB		 541
542#ifdef CONFIG_MAC80211_IBSS_DEBUG
543 if (bss)
544 printk(KERN_DEBUG " sta_find_ibss: selected %pM current "
545 "%pM\n", bss->cbss.bssid, ifibss->bssid);
546#endif /* CONFIG_MAC80211_IBSS_DEBUG */
547
af8cdcd8 548 if (bss && memcmp(ifibss->bssid, bss->cbss.bssid, ETH_ALEN)) {
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;
46900298
JB		 556 } else if (bss)
557 ieee80211_rx_bss_put(local, bss);
558
559#ifdef CONFIG_MAC80211_IBSS_DEBUG
560 printk(KERN_DEBUG " did not try to join ibss\n");
561#endif /* CONFIG_MAC80211_IBSS_DEBUG */
562
563 /* Selected IBSS not found in current scan results - try to scan */
564 if (ifibss->state == IEEE80211_IBSS_MLME_JOINED &&
565 !ieee80211_sta_active_ibss(sdata)) {
af8cdcd8
JB		 566 mod_timer(&ifibss->timer,
567 round_jiffies(jiffies + IEEE80211_IBSS_MERGE_INTERVAL));
568 } else if (time_after(jiffies, ifibss->last_scan_completed +
46900298
JB		 569 IEEE80211_SCAN_INTERVAL)) {
570 printk(KERN_DEBUG "%s: Trigger new scan to find an IBSS to "
571 "join\n", sdata->dev->name);
572
f3b85252
JB		 573 ieee80211_request_internal_scan(sdata, ifibss->ssid,
574 ifibss->ssid_len);
46900298
JB		 575 } else if (ifibss->state != IEEE80211_IBSS_MLME_JOINED) {
576 int interval = IEEE80211_SCAN_INTERVAL;
577
578 if (time_after(jiffies, ifibss->ibss_join_req +
579 IEEE80211_IBSS_JOIN_TIMEOUT)) {
af8cdcd8
JB		 580 if (!(local->oper_channel->flags & IEEE80211_CHAN_NO_IBSS)) {
581 ieee80211_sta_create_ibss(sdata);
582 return;
583 }
46900298
JB		 584 printk(KERN_DEBUG "%s: IBSS not allowed on"
585 " %d MHz\n", sdata->dev->name,
586 local->hw.conf.channel->center_freq);
587
588 /* No IBSS found - decrease scan interval and continue
589 * scanning. */
590 interval = IEEE80211_SCAN_INTERVAL_SLOW;
591 }
592
593 ifibss->state = IEEE80211_IBSS_MLME_SEARCH;
af8cdcd8
JB		 594 mod_timer(&ifibss->timer,
595 round_jiffies(jiffies + interval));
46900298 596 }
46900298
JB		 597}
598
599static void ieee80211_rx_mgmt_probe_req(struct ieee80211_sub_if_data *sdata,
600 struct ieee80211_mgmt *mgmt,
601 size_t len)
602{
603 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
604 struct ieee80211_local *local = sdata->local;
605 int tx_last_beacon;
606 struct sk_buff *skb;
607 struct ieee80211_mgmt *resp;
608 u8 *pos, *end;
609
610 if (ifibss->state != IEEE80211_IBSS_MLME_JOINED ||
af8cdcd8 611 len < 24 + 2 || !ifibss->presp)
46900298
JB		 612 return;
613
24487981 614 tx_last_beacon = drv_tx_last_beacon(local);
46900298
JB		 615
616#ifdef CONFIG_MAC80211_IBSS_DEBUG
617 printk(KERN_DEBUG "%s: RX ProbeReq SA=%pM DA=%pM BSSID=%pM"
618 " (tx_last_beacon=%d)\n",
619 sdata->dev->name, mgmt->sa, mgmt->da,
620 mgmt->bssid, tx_last_beacon);
621#endif /* CONFIG_MAC80211_IBSS_DEBUG */
622
623 if (!tx_last_beacon)
624 return;
625
626 if (memcmp(mgmt->bssid, ifibss->bssid, ETH_ALEN) != 0 &&
627 memcmp(mgmt->bssid, "\xff\xff\xff\xff\xff\xff", ETH_ALEN) != 0)
628 return;
629
630 end = ((u8 *) mgmt) + len;
631 pos = mgmt->u.probe_req.variable;
632 if (pos[0] != WLAN_EID_SSID ||
633 pos + 2 + pos[1] > end) {
634#ifdef CONFIG_MAC80211_IBSS_DEBUG
635 printk(KERN_DEBUG "%s: Invalid SSID IE in ProbeReq "
636 "from %pM\n",
637 sdata->dev->name, mgmt->sa);
638#endif
639 return;
640 }
641 if (pos[1] != 0 &&
642 (pos[1] != ifibss->ssid_len ||
af8cdcd8 643 !memcmp(pos + 2, ifibss->ssid, ifibss->ssid_len))) {
46900298
JB		 644 /* Ignore ProbeReq for foreign SSID */
645 return;
646 }
647
648 /* Reply with ProbeResp */
af8cdcd8 649 skb = skb_copy(ifibss->presp, GFP_KERNEL);
46900298
JB		 650 if (!skb)
651 return;
652
653 resp = (struct ieee80211_mgmt *) skb->data;
654 memcpy(resp->da, mgmt->sa, ETH_ALEN);
655#ifdef CONFIG_MAC80211_IBSS_DEBUG
656 printk(KERN_DEBUG "%s: Sending ProbeResp to %pM\n",
657 sdata->dev->name, resp->da);
658#endif /* CONFIG_MAC80211_IBSS_DEBUG */
659 ieee80211_tx_skb(sdata, skb, 0);
660}
661
662static void ieee80211_rx_mgmt_probe_resp(struct ieee80211_sub_if_data *sdata,
663 struct ieee80211_mgmt *mgmt,
664 size_t len,
665 struct ieee80211_rx_status *rx_status)
666{
667 size_t baselen;
668 struct ieee802_11_elems elems;
669
670 if (memcmp(mgmt->da, sdata->dev->dev_addr, ETH_ALEN))
671 return; /* ignore ProbeResp to foreign address */
672
673 baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt;
674 if (baselen > len)
675 return;
676
677 ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen,
678 &elems);
679
680 ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems, false);
681}
682
683static void ieee80211_rx_mgmt_beacon(struct ieee80211_sub_if_data *sdata,
684 struct ieee80211_mgmt *mgmt,
685 size_t len,
686 struct ieee80211_rx_status *rx_status)
687{
688 size_t baselen;
689 struct ieee802_11_elems elems;
690
691 /* Process beacon from the current BSS */
692 baselen = (u8 *) mgmt->u.beacon.variable - (u8 *) mgmt;
693 if (baselen > len)
694 return;
695
696 ieee802_11_parse_elems(mgmt->u.beacon.variable, len - baselen, &elems);
697
698 ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems, true);
699}
700
701static void ieee80211_ibss_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata,
702 struct sk_buff *skb)
703{
704 struct ieee80211_rx_status *rx_status;
705 struct ieee80211_mgmt *mgmt;
706 u16 fc;
707
f1d58c25 708 rx_status = IEEE80211_SKB_RXCB(skb);
46900298
JB		 709 mgmt = (struct ieee80211_mgmt *) skb->data;
710 fc = le16_to_cpu(mgmt->frame_control);
711
712 switch (fc & IEEE80211_FCTL_STYPE) {
713 case IEEE80211_STYPE_PROBE_REQ:
714 ieee80211_rx_mgmt_probe_req(sdata, mgmt, skb->len);
715 break;
716 case IEEE80211_STYPE_PROBE_RESP:
717 ieee80211_rx_mgmt_probe_resp(sdata, mgmt, skb->len,
718 rx_status);
719 break;
720 case IEEE80211_STYPE_BEACON:
721 ieee80211_rx_mgmt_beacon(sdata, mgmt, skb->len,
722 rx_status);
723 break;
724 case IEEE80211_STYPE_AUTH:
725 ieee80211_rx_mgmt_auth_ibss(sdata, mgmt, skb->len);
726 break;
727 }
728
729 kfree_skb(skb);
730}
731
732static void ieee80211_ibss_work(struct work_struct *work)
733{
734 struct ieee80211_sub_if_data *sdata =
735 container_of(work, struct ieee80211_sub_if_data, u.ibss.work);
736 struct ieee80211_local *local = sdata->local;
737 struct ieee80211_if_ibss *ifibss;
738 struct sk_buff *skb;
739
5bb644a0
JB		 740 if (WARN_ON(local->suspended))
741 return;
742
46900298
JB		 743 if (!netif_running(sdata->dev))
744 return;
745
746 if (local->sw_scanning || local->hw_scanning)
747 return;
748
749 if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_ADHOC))
750 return;
751 ifibss = &sdata->u.ibss;
752
753 while ((skb = skb_dequeue(&ifibss->skb_queue)))
754 ieee80211_ibss_rx_queued_mgmt(sdata, skb);
755
756 if (!test_and_clear_bit(IEEE80211_IBSS_REQ_RUN, &ifibss->request))
757 return;
758
759 switch (ifibss->state) {
760 case IEEE80211_IBSS_MLME_SEARCH:
761 ieee80211_sta_find_ibss(sdata);
762 break;
763 case IEEE80211_IBSS_MLME_JOINED:
764 ieee80211_sta_merge_ibss(sdata);
765 break;
766 default:
767 WARN_ON(1);
768 break;
769 }
770}
771
772static void ieee80211_ibss_timer(unsigned long data)
773{
774 struct ieee80211_sub_if_data *sdata =
775 (struct ieee80211_sub_if_data *) data;
776 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
777 struct ieee80211_local *local = sdata->local;
778
5bb644a0
JB		 779 if (local->quiescing) {
780 ifibss->timer_running = true;
781 return;
782 }
783
46900298
JB		 784 set_bit(IEEE80211_IBSS_REQ_RUN, &ifibss->request);
785 queue_work(local->hw.workqueue, &ifibss->work);
786}
787
5bb644a0
JB		 788#ifdef CONFIG_PM
789void ieee80211_ibss_quiesce(struct ieee80211_sub_if_data *sdata)
790{
791 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
792
793 cancel_work_sync(&ifibss->work);
794 if (del_timer_sync(&ifibss->timer))
795 ifibss->timer_running = true;
796}
797
798void ieee80211_ibss_restart(struct ieee80211_sub_if_data *sdata)
799{
800 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
801
802 if (ifibss->timer_running) {
803 add_timer(&ifibss->timer);
804 ifibss->timer_running = false;
805 }
806}
807#endif
808
46900298
JB		 809void ieee80211_ibss_setup_sdata(struct ieee80211_sub_if_data *sdata)
810{
811 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
812
813 INIT_WORK(&ifibss->work, ieee80211_ibss_work);
814 setup_timer(&ifibss->timer, ieee80211_ibss_timer,
815 (unsigned long) sdata);
816 skb_queue_head_init(&ifibss->skb_queue);
46900298
JB		 817}
818
819/* scan finished notification */
820void ieee80211_ibss_notify_scan_completed(struct ieee80211_local *local)
821{
af8cdcd8 822 struct ieee80211_sub_if_data *sdata;
46900298 823
29b4a4f7
JB		 824 mutex_lock(&local->iflist_mtx);
825 list_for_each_entry(sdata, &local->interfaces, list) {
0e41f715
JB		 826 if (!netif_running(sdata->dev))
827 continue;
af8cdcd8
JB		 828 if (sdata->vif.type != NL80211_IFTYPE_ADHOC)
829 continue;
0e41f715
JB		 830 if (!sdata->u.ibss.ssid_len)
831 continue;
af8cdcd8
JB		 832 sdata->u.ibss.last_scan_completed = jiffies;
833 ieee80211_sta_find_ibss(sdata);
46900298 834 }
29b4a4f7 835 mutex_unlock(&local->iflist_mtx);
46900298
JB		 836}
837
838ieee80211_rx_result
f1d58c25 839ieee80211_ibss_rx_mgmt(struct ieee80211_sub_if_data *sdata, struct sk_buff *skb)
46900298
JB		 840{
841 struct ieee80211_local *local = sdata->local;
842 struct ieee80211_mgmt *mgmt;
843 u16 fc;
844
845 if (skb->len < 24)
846 return RX_DROP_MONITOR;
847
848 mgmt = (struct ieee80211_mgmt *) skb->data;
849 fc = le16_to_cpu(mgmt->frame_control);
850
851 switch (fc & IEEE80211_FCTL_STYPE) {
852 case IEEE80211_STYPE_PROBE_RESP:
853 case IEEE80211_STYPE_BEACON:
46900298
JB		 854 case IEEE80211_STYPE_PROBE_REQ:
855 case IEEE80211_STYPE_AUTH:
856 skb_queue_tail(&sdata->u.ibss.skb_queue, skb);
857 queue_work(local->hw.workqueue, &sdata->u.ibss.work);
858 return RX_QUEUED;
859 }
860
861 return RX_DROP_MONITOR;
862}
af8cdcd8
JB		 863
864int ieee80211_ibss_join(struct ieee80211_sub_if_data *sdata,
865 struct cfg80211_ibss_params *params)
866{
867 struct sk_buff *skb;
868
af8cdcd8
JB		 869 if (params->bssid) {
870 memcpy(sdata->u.ibss.bssid, params->bssid, ETH_ALEN);
871 sdata->u.ibss.fixed_bssid = true;
872 } else
873 sdata->u.ibss.fixed_bssid = false;
874
57c4d7b4
JB		 875 sdata->vif.bss_conf.beacon_int = params->beacon_interval;
876
af8cdcd8
JB		 877 sdata->u.ibss.channel = params->channel;
878 sdata->u.ibss.fixed_channel = params->channel_fixed;
879
880 if (params->ie) {
881 sdata->u.ibss.ie = kmemdup(params->ie, params->ie_len,
882 GFP_KERNEL);
883 if (sdata->u.ibss.ie)
884 sdata->u.ibss.ie_len = params->ie_len;
885 }
886
887 skb = dev_alloc_skb(sdata->local->hw.extra_tx_headroom +
888 36 /* bitrates */ +
889 34 /* SSID */ +
890 3 /* DS params */ +
891 4 /* IBSS params */ +
892 params->ie_len);
893 if (!skb)
894 return -ENOMEM;
895
896 sdata->u.ibss.skb = skb;
897 sdata->u.ibss.state = IEEE80211_IBSS_MLME_SEARCH;
898 sdata->u.ibss.ibss_join_req = jiffies;
899
0e41f715
JB		 900 memcpy(sdata->u.ibss.ssid, params->ssid, IEEE80211_MAX_SSID_LEN);
901
902 /*
903 * The ssid_len setting below is used to see whether
904 * we are active, and we need all other settings
905 * before that may get visible.
906 */
907 mb();
908
909 sdata->u.ibss.ssid_len = params->ssid_len;
910
5cff20e6
JB		 911 ieee80211_recalc_idle(sdata->local);
912
af8cdcd8
JB		 913 set_bit(IEEE80211_IBSS_REQ_RUN, &sdata->u.ibss.request);
914 queue_work(sdata->local->hw.workqueue, &sdata->u.ibss.work);
915
916 return 0;
917}
918
919int ieee80211_ibss_leave(struct ieee80211_sub_if_data *sdata)
920{
921 struct sk_buff *skb;
922
923 del_timer_sync(&sdata->u.ibss.timer);
924 clear_bit(IEEE80211_IBSS_REQ_RUN, &sdata->u.ibss.request);
925 cancel_work_sync(&sdata->u.ibss.work);
926 clear_bit(IEEE80211_IBSS_REQ_RUN, &sdata->u.ibss.request);
927
928 sta_info_flush(sdata->local, sdata);
929
930 /* remove beacon */
931 kfree(sdata->u.ibss.ie);
932 skb = sdata->u.ibss.presp;
933 rcu_assign_pointer(sdata->u.ibss.presp, NULL);
2d0ddec5 934 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BEACON_ENABLED);
af8cdcd8
JB		 935 synchronize_rcu();
936 kfree_skb(skb);
937
938 skb_queue_purge(&sdata->u.ibss.skb_queue);
939 memset(sdata->u.ibss.bssid, 0, ETH_ALEN);
5cff20e6
JB		 940 sdata->u.ibss.ssid_len = 0;
941
942 ieee80211_recalc_idle(sdata->local);
af8cdcd8
JB		 943
944 return 0;
945}
Linux kernel - Deliverables
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