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dccp: fix dccp rmmod when kernel configured to use slub
[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,
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{
2e10d330 385 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
46900298
JB		 386 struct ieee80211_local *local = sdata->local;
387 struct sta_info *sta;
388 int band = local->hw.conf.channel->band;
389
af8cdcd8
JB		 390 /*
391 * XXX: Consider removing the least recently used entry and
392 * allow new one to be added.
393 */
46900298 394 if (local->num_sta >= IEEE80211_IBSS_MAX_STA_ENTRIES) {
af8cdcd8
JB		 395 if (net_ratelimit())
396 printk(KERN_DEBUG "%s: No room for a new IBSS STA entry %pM\n",
397 sdata->dev->name, addr);
46900298
JB		 398 return NULL;
399 }
400
2e10d330
FF		 401 if (ifibss->state == IEEE80211_IBSS_MLME_SEARCH)
402 return NULL;
403
46900298
JB		 404 if (compare_ether_addr(bssid, sdata->u.ibss.bssid))
405 return NULL;
406
407#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
408 printk(KERN_DEBUG "%s: Adding new IBSS station %pM (dev=%s)\n",
409 wiphy_name(local->hw.wiphy), addr, sdata->dev->name);
410#endif
411
412 sta = sta_info_alloc(sdata, addr, GFP_ATOMIC);
413 if (!sta)
414 return NULL;
415
416 set_sta_flags(sta, WLAN_STA_AUTHORIZED);
417
418 /* make sure mandatory rates are always added */
419 sta->sta.supp_rates[band] = supp_rates |
420 ieee80211_mandatory_rates(local, band);
421
422 rate_control_rate_init(sta);
423
424 if (sta_info_insert(sta))
425 return NULL;
426
427 return sta;
428}
429
430static int ieee80211_sta_active_ibss(struct ieee80211_sub_if_data *sdata)
431{
432 struct ieee80211_local *local = sdata->local;
433 int active = 0;
434 struct sta_info *sta;
435
436 rcu_read_lock();
437
438 list_for_each_entry_rcu(sta, &local->sta_list, list) {
439 if (sta->sdata == sdata &&
440 time_after(sta->last_rx + IEEE80211_IBSS_MERGE_INTERVAL,
441 jiffies)) {
442 active++;
443 break;
444 }
445 }
446
447 rcu_read_unlock();
448
449 return active;
450}
451
452
453static void ieee80211_sta_merge_ibss(struct ieee80211_sub_if_data *sdata)
454{
455 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
456
af8cdcd8
JB		 457 mod_timer(&ifibss->timer,
458 round_jiffies(jiffies + IEEE80211_IBSS_MERGE_INTERVAL));
46900298
JB		 459
460 ieee80211_sta_expire(sdata, IEEE80211_IBSS_INACTIVITY_LIMIT);
af8cdcd8 461
450aae3d
S		 462 if (time_before(jiffies, ifibss->last_scan_completed +
463 IEEE80211_IBSS_MERGE_INTERVAL))
464 return;
465
46900298
JB		 466 if (ieee80211_sta_active_ibss(sdata))
467 return;
468
af8cdcd8 469 if (ifibss->fixed_channel)
46900298
JB		 470 return;
471
472 printk(KERN_DEBUG "%s: No active IBSS STAs - trying to scan for other "
473 "IBSS networks with same SSID (merge)\n", sdata->dev->name);
474
f3b85252 475 ieee80211_request_internal_scan(sdata, ifibss->ssid, ifibss->ssid_len);
46900298
JB		 476}
477
af8cdcd8 478static void ieee80211_sta_create_ibss(struct ieee80211_sub_if_data *sdata)
46900298
JB		 479{
480 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
481 struct ieee80211_local *local = sdata->local;
482 struct ieee80211_supported_band *sband;
46900298 483 u8 bssid[ETH_ALEN];
46900298
JB		 484 u16 capability;
485 int i;
486
af8cdcd8 487 if (ifibss->fixed_bssid) {
46900298
JB		 488 memcpy(bssid, ifibss->bssid, ETH_ALEN);
489 } else {
490 /* Generate random, not broadcast, locally administered BSSID. Mix in
491 * own MAC address to make sure that devices that do not have proper
492 * random number generator get different BSSID. */
493 get_random_bytes(bssid, ETH_ALEN);
494 for (i = 0; i < ETH_ALEN; i++)
495 bssid[i] ^= sdata->dev->dev_addr[i];
496 bssid[0] &= ~0x01;
497 bssid[0] |= 0x02;
498 }
499
500 printk(KERN_DEBUG "%s: Creating new IBSS network, BSSID %pM\n",
501 sdata->dev->name, bssid);
502
af8cdcd8 503 sband = local->hw.wiphy->bands[ifibss->channel->band];
46900298 504
46900298
JB		 505 capability = WLAN_CAPABILITY_IBSS;
506
fffd0934 507 if (ifibss->privacy)
46900298
JB		 508 capability |= WLAN_CAPABILITY_PRIVACY;
509 else
510 sdata->drop_unencrypted = 0;
511
57c4d7b4 512 __ieee80211_sta_join_ibss(sdata, bssid, sdata->vif.bss_conf.beacon_int,
b59066a2
JB		 513 ifibss->channel, 3, /* first two are basic */
514 capability, 0);
46900298
JB		 515}
516
af8cdcd8 517static void ieee80211_sta_find_ibss(struct ieee80211_sub_if_data *sdata)
46900298
JB		 518{
519 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
520 struct ieee80211_local *local = sdata->local;
521 struct ieee80211_bss *bss;
af8cdcd8 522 struct ieee80211_channel *chan = NULL;
46900298
JB		 523 const u8 *bssid = NULL;
524 int active_ibss;
e0d61887 525 u16 capability;
46900298 526
46900298
JB		 527 active_ibss = ieee80211_sta_active_ibss(sdata);
528#ifdef CONFIG_MAC80211_IBSS_DEBUG
529 printk(KERN_DEBUG "%s: sta_find_ibss (active_ibss=%d)\n",
530 sdata->dev->name, active_ibss);
531#endif /* CONFIG_MAC80211_IBSS_DEBUG */
532
533 if (active_ibss)
af8cdcd8 534 return;
46900298 535
e0d61887 536 capability = WLAN_CAPABILITY_IBSS;
fffd0934 537 if (ifibss->privacy)
e0d61887 538 capability |= WLAN_CAPABILITY_PRIVACY;
af8cdcd8
JB		 539 if (ifibss->fixed_bssid)
540 bssid = ifibss->bssid;
541 if (ifibss->fixed_channel)
542 chan = ifibss->channel;
543 if (!is_zero_ether_addr(ifibss->bssid))
46900298 544 bssid = ifibss->bssid;
af8cdcd8 545 bss = (void *)cfg80211_get_bss(local->hw.wiphy, chan, bssid,
46900298 546 ifibss->ssid, ifibss->ssid_len,
e0d61887 547 WLAN_CAPABILITY_IBSS |
db67645d
JB		 548 WLAN_CAPABILITY_PRIVACY,
549 capability);
46900298 550
d419b9f0 551 if (bss) {
46900298 552#ifdef CONFIG_MAC80211_IBSS_DEBUG
46900298
JB		 553 printk(KERN_DEBUG " sta_find_ibss: selected %pM current "
554 "%pM\n", bss->cbss.bssid, ifibss->bssid);
555#endif /* CONFIG_MAC80211_IBSS_DEBUG */
556
46900298
JB		 557 printk(KERN_DEBUG "%s: Selected IBSS BSSID %pM"
558 " based on configured SSID\n",
559 sdata->dev->name, bss->cbss.bssid);
560
af8cdcd8 561 ieee80211_sta_join_ibss(sdata, bss);
46900298 562 ieee80211_rx_bss_put(local, bss);
af8cdcd8 563 return;
d419b9f0 564 }
46900298
JB		 565
566#ifdef CONFIG_MAC80211_IBSS_DEBUG
567 printk(KERN_DEBUG " did not try to join ibss\n");
568#endif /* CONFIG_MAC80211_IBSS_DEBUG */
569
570 /* Selected IBSS not found in current scan results - try to scan */
571 if (ifibss->state == IEEE80211_IBSS_MLME_JOINED &&
572 !ieee80211_sta_active_ibss(sdata)) {
af8cdcd8
JB		 573 mod_timer(&ifibss->timer,
574 round_jiffies(jiffies + IEEE80211_IBSS_MERGE_INTERVAL));
575 } else if (time_after(jiffies, ifibss->last_scan_completed +
46900298
JB		 576 IEEE80211_SCAN_INTERVAL)) {
577 printk(KERN_DEBUG "%s: Trigger new scan to find an IBSS to "
578 "join\n", sdata->dev->name);
579
f3b85252
JB		 580 ieee80211_request_internal_scan(sdata, ifibss->ssid,
581 ifibss->ssid_len);
46900298
JB		 582 } else if (ifibss->state != IEEE80211_IBSS_MLME_JOINED) {
583 int interval = IEEE80211_SCAN_INTERVAL;
584
585 if (time_after(jiffies, ifibss->ibss_join_req +
586 IEEE80211_IBSS_JOIN_TIMEOUT)) {
af8cdcd8
JB		 587 if (!(local->oper_channel->flags & IEEE80211_CHAN_NO_IBSS)) {
588 ieee80211_sta_create_ibss(sdata);
589 return;
590 }
46900298
JB		 591 printk(KERN_DEBUG "%s: IBSS not allowed on"
592 " %d MHz\n", sdata->dev->name,
593 local->hw.conf.channel->center_freq);
594
595 /* No IBSS found - decrease scan interval and continue
596 * scanning. */
597 interval = IEEE80211_SCAN_INTERVAL_SLOW;
598 }
599
600 ifibss->state = IEEE80211_IBSS_MLME_SEARCH;
af8cdcd8
JB		 601 mod_timer(&ifibss->timer,
602 round_jiffies(jiffies + interval));
46900298 603 }
46900298
JB		 604}
605
606static void ieee80211_rx_mgmt_probe_req(struct ieee80211_sub_if_data *sdata,
607 struct ieee80211_mgmt *mgmt,
608 size_t len)
609{
610 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
611 struct ieee80211_local *local = sdata->local;
612 int tx_last_beacon;
613 struct sk_buff *skb;
614 struct ieee80211_mgmt *resp;
615 u8 *pos, *end;
616
617 if (ifibss->state != IEEE80211_IBSS_MLME_JOINED ||
af8cdcd8 618 len < 24 + 2 || !ifibss->presp)
46900298
JB		 619 return;
620
24487981 621 tx_last_beacon = drv_tx_last_beacon(local);
46900298
JB		 622
623#ifdef CONFIG_MAC80211_IBSS_DEBUG
624 printk(KERN_DEBUG "%s: RX ProbeReq SA=%pM DA=%pM BSSID=%pM"
625 " (tx_last_beacon=%d)\n",
626 sdata->dev->name, mgmt->sa, mgmt->da,
627 mgmt->bssid, tx_last_beacon);
628#endif /* CONFIG_MAC80211_IBSS_DEBUG */
629
630 if (!tx_last_beacon)
631 return;
632
633 if (memcmp(mgmt->bssid, ifibss->bssid, ETH_ALEN) != 0 &&
634 memcmp(mgmt->bssid, "\xff\xff\xff\xff\xff\xff", ETH_ALEN) != 0)
635 return;
636
637 end = ((u8 *) mgmt) + len;
638 pos = mgmt->u.probe_req.variable;
639 if (pos[0] != WLAN_EID_SSID ||
640 pos + 2 + pos[1] > end) {
641#ifdef CONFIG_MAC80211_IBSS_DEBUG
642 printk(KERN_DEBUG "%s: Invalid SSID IE in ProbeReq "
643 "from %pM\n",
644 sdata->dev->name, mgmt->sa);
645#endif
646 return;
647 }
648 if (pos[1] != 0 &&
649 (pos[1] != ifibss->ssid_len ||
af8cdcd8 650 !memcmp(pos + 2, ifibss->ssid, ifibss->ssid_len))) {
46900298
JB		 651 /* Ignore ProbeReq for foreign SSID */
652 return;
653 }
654
655 /* Reply with ProbeResp */
af8cdcd8 656 skb = skb_copy(ifibss->presp, GFP_KERNEL);
46900298
JB		 657 if (!skb)
658 return;
659
660 resp = (struct ieee80211_mgmt *) skb->data;
661 memcpy(resp->da, mgmt->sa, ETH_ALEN);
662#ifdef CONFIG_MAC80211_IBSS_DEBUG
663 printk(KERN_DEBUG "%s: Sending ProbeResp to %pM\n",
664 sdata->dev->name, resp->da);
665#endif /* CONFIG_MAC80211_IBSS_DEBUG */
62ae67be
JB		 666 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
667 ieee80211_tx_skb(sdata, skb);
46900298
JB		 668}
669
670static void ieee80211_rx_mgmt_probe_resp(struct ieee80211_sub_if_data *sdata,
671 struct ieee80211_mgmt *mgmt,
672 size_t len,
673 struct ieee80211_rx_status *rx_status)
674{
675 size_t baselen;
676 struct ieee802_11_elems elems;
677
678 if (memcmp(mgmt->da, sdata->dev->dev_addr, ETH_ALEN))
679 return; /* ignore ProbeResp to foreign address */
680
681 baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt;
682 if (baselen > len)
683 return;
684
685 ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen,
686 &elems);
687
688 ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems, false);
689}
690
691static void ieee80211_rx_mgmt_beacon(struct ieee80211_sub_if_data *sdata,
692 struct ieee80211_mgmt *mgmt,
693 size_t len,
694 struct ieee80211_rx_status *rx_status)
695{
696 size_t baselen;
697 struct ieee802_11_elems elems;
698
699 /* Process beacon from the current BSS */
700 baselen = (u8 *) mgmt->u.beacon.variable - (u8 *) mgmt;
701 if (baselen > len)
702 return;
703
704 ieee802_11_parse_elems(mgmt->u.beacon.variable, len - baselen, &elems);
705
706 ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems, true);
707}
708
709static void ieee80211_ibss_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata,
710 struct sk_buff *skb)
711{
712 struct ieee80211_rx_status *rx_status;
713 struct ieee80211_mgmt *mgmt;
714 u16 fc;
715
f1d58c25 716 rx_status = IEEE80211_SKB_RXCB(skb);
46900298
JB		 717 mgmt = (struct ieee80211_mgmt *) skb->data;
718 fc = le16_to_cpu(mgmt->frame_control);
719
720 switch (fc & IEEE80211_FCTL_STYPE) {
721 case IEEE80211_STYPE_PROBE_REQ:
722 ieee80211_rx_mgmt_probe_req(sdata, mgmt, skb->len);
723 break;
724 case IEEE80211_STYPE_PROBE_RESP:
725 ieee80211_rx_mgmt_probe_resp(sdata, mgmt, skb->len,
726 rx_status);
727 break;
728 case IEEE80211_STYPE_BEACON:
729 ieee80211_rx_mgmt_beacon(sdata, mgmt, skb->len,
730 rx_status);
731 break;
732 case IEEE80211_STYPE_AUTH:
733 ieee80211_rx_mgmt_auth_ibss(sdata, mgmt, skb->len);
734 break;
735 }
736
737 kfree_skb(skb);
738}
739
740static void ieee80211_ibss_work(struct work_struct *work)
741{
742 struct ieee80211_sub_if_data *sdata =
743 container_of(work, struct ieee80211_sub_if_data, u.ibss.work);
744 struct ieee80211_local *local = sdata->local;
745 struct ieee80211_if_ibss *ifibss;
746 struct sk_buff *skb;
747
5bb644a0
JB		 748 if (WARN_ON(local->suspended))
749 return;
750
46900298
JB		 751 if (!netif_running(sdata->dev))
752 return;
753
fbe9c429 754 if (local->scanning)
46900298
JB		 755 return;
756
757 if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_ADHOC))
758 return;
759 ifibss = &sdata->u.ibss;
760
761 while ((skb = skb_dequeue(&ifibss->skb_queue)))
762 ieee80211_ibss_rx_queued_mgmt(sdata, skb);
763
764 if (!test_and_clear_bit(IEEE80211_IBSS_REQ_RUN, &ifibss->request))
765 return;
766
767 switch (ifibss->state) {
768 case IEEE80211_IBSS_MLME_SEARCH:
769 ieee80211_sta_find_ibss(sdata);
770 break;
771 case IEEE80211_IBSS_MLME_JOINED:
772 ieee80211_sta_merge_ibss(sdata);
773 break;
774 default:
775 WARN_ON(1);
776 break;
777 }
778}
779
780static void ieee80211_ibss_timer(unsigned long data)
781{
782 struct ieee80211_sub_if_data *sdata =
783 (struct ieee80211_sub_if_data *) data;
784 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
785 struct ieee80211_local *local = sdata->local;
786
5bb644a0
JB		 787 if (local->quiescing) {
788 ifibss->timer_running = true;
789 return;
790 }
791
46900298 792 set_bit(IEEE80211_IBSS_REQ_RUN, &ifibss->request);
42935eca 793 ieee80211_queue_work(&local->hw, &ifibss->work);
46900298
JB		 794}
795
5bb644a0
JB		 796#ifdef CONFIG_PM
797void ieee80211_ibss_quiesce(struct ieee80211_sub_if_data *sdata)
798{
799 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
800
801 cancel_work_sync(&ifibss->work);
802 if (del_timer_sync(&ifibss->timer))
803 ifibss->timer_running = true;
804}
805
806void ieee80211_ibss_restart(struct ieee80211_sub_if_data *sdata)
807{
808 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
809
810 if (ifibss->timer_running) {
811 add_timer(&ifibss->timer);
812 ifibss->timer_running = false;
813 }
814}
815#endif
816
46900298
JB		 817void ieee80211_ibss_setup_sdata(struct ieee80211_sub_if_data *sdata)
818{
819 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
820
821 INIT_WORK(&ifibss->work, ieee80211_ibss_work);
822 setup_timer(&ifibss->timer, ieee80211_ibss_timer,
823 (unsigned long) sdata);
824 skb_queue_head_init(&ifibss->skb_queue);
46900298
JB		 825}
826
827/* scan finished notification */
828void ieee80211_ibss_notify_scan_completed(struct ieee80211_local *local)
829{
af8cdcd8 830 struct ieee80211_sub_if_data *sdata;
46900298 831
29b4a4f7
JB		 832 mutex_lock(&local->iflist_mtx);
833 list_for_each_entry(sdata, &local->interfaces, list) {
0e41f715
JB		 834 if (!netif_running(sdata->dev))
835 continue;
af8cdcd8
JB		 836 if (sdata->vif.type != NL80211_IFTYPE_ADHOC)
837 continue;
0e41f715
JB		 838 if (!sdata->u.ibss.ssid_len)
839 continue;
af8cdcd8 840 sdata->u.ibss.last_scan_completed = jiffies;
51f98f13 841 mod_timer(&sdata->u.ibss.timer, 0);
46900298 842 }
29b4a4f7 843 mutex_unlock(&local->iflist_mtx);
46900298
JB		 844}
845
846ieee80211_rx_result
f1d58c25 847ieee80211_ibss_rx_mgmt(struct ieee80211_sub_if_data *sdata, struct sk_buff *skb)
46900298
JB		 848{
849 struct ieee80211_local *local = sdata->local;
850 struct ieee80211_mgmt *mgmt;
851 u16 fc;
852
853 if (skb->len < 24)
854 return RX_DROP_MONITOR;
855
856 mgmt = (struct ieee80211_mgmt *) skb->data;
857 fc = le16_to_cpu(mgmt->frame_control);
858
859 switch (fc & IEEE80211_FCTL_STYPE) {
860 case IEEE80211_STYPE_PROBE_RESP:
861 case IEEE80211_STYPE_BEACON:
46900298
JB		 862 case IEEE80211_STYPE_PROBE_REQ:
863 case IEEE80211_STYPE_AUTH:
864 skb_queue_tail(&sdata->u.ibss.skb_queue, skb);
42935eca 865 ieee80211_queue_work(&local->hw, &sdata->u.ibss.work);
46900298
JB		 866 return RX_QUEUED;
867 }
868
869 return RX_DROP_MONITOR;
870}
af8cdcd8
JB		 871
872int ieee80211_ibss_join(struct ieee80211_sub_if_data *sdata,
873 struct cfg80211_ibss_params *params)
874{
875 struct sk_buff *skb;
876
af8cdcd8
JB		 877 if (params->bssid) {
878 memcpy(sdata->u.ibss.bssid, params->bssid, ETH_ALEN);
879 sdata->u.ibss.fixed_bssid = true;
880 } else
881 sdata->u.ibss.fixed_bssid = false;
882
fffd0934
JB		 883 sdata->u.ibss.privacy = params->privacy;
884
57c4d7b4
JB		 885 sdata->vif.bss_conf.beacon_int = params->beacon_interval;
886
af8cdcd8
JB		 887 sdata->u.ibss.channel = params->channel;
888 sdata->u.ibss.fixed_channel = params->channel_fixed;
889
890 if (params->ie) {
891 sdata->u.ibss.ie = kmemdup(params->ie, params->ie_len,
892 GFP_KERNEL);
893 if (sdata->u.ibss.ie)
894 sdata->u.ibss.ie_len = params->ie_len;
895 }
896
897 skb = dev_alloc_skb(sdata->local->hw.extra_tx_headroom +
898 36 /* bitrates */ +
899 34 /* SSID */ +
900 3 /* DS params */ +
901 4 /* IBSS params */ +
902 params->ie_len);
903 if (!skb)
904 return -ENOMEM;
905
906 sdata->u.ibss.skb = skb;
907 sdata->u.ibss.state = IEEE80211_IBSS_MLME_SEARCH;
908 sdata->u.ibss.ibss_join_req = jiffies;
909
0e41f715
JB		 910 memcpy(sdata->u.ibss.ssid, params->ssid, IEEE80211_MAX_SSID_LEN);
911
912 /*
913 * The ssid_len setting below is used to see whether
914 * we are active, and we need all other settings
915 * before that may get visible.
916 */
917 mb();
918
919 sdata->u.ibss.ssid_len = params->ssid_len;
920
5cff20e6
JB		 921 ieee80211_recalc_idle(sdata->local);
922
af8cdcd8 923 set_bit(IEEE80211_IBSS_REQ_RUN, &sdata->u.ibss.request);
42935eca 924 ieee80211_queue_work(&sdata->local->hw, &sdata->u.ibss.work);
af8cdcd8
JB		 925
926 return 0;
927}
928
929int ieee80211_ibss_leave(struct ieee80211_sub_if_data *sdata)
930{
931 struct sk_buff *skb;
932
933 del_timer_sync(&sdata->u.ibss.timer);
934 clear_bit(IEEE80211_IBSS_REQ_RUN, &sdata->u.ibss.request);
935 cancel_work_sync(&sdata->u.ibss.work);
936 clear_bit(IEEE80211_IBSS_REQ_RUN, &sdata->u.ibss.request);
937
938 sta_info_flush(sdata->local, sdata);
939
940 /* remove beacon */
941 kfree(sdata->u.ibss.ie);
942 skb = sdata->u.ibss.presp;
943 rcu_assign_pointer(sdata->u.ibss.presp, NULL);
2d0ddec5 944 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BEACON_ENABLED);
af8cdcd8
JB		 945 synchronize_rcu();
946 kfree_skb(skb);
947
948 skb_queue_purge(&sdata->u.ibss.skb_queue);
949 memset(sdata->u.ibss.bssid, 0, ETH_ALEN);
5cff20e6
JB		 950 sdata->u.ibss.ssid_len = 0;
951
952 ieee80211_recalc_idle(sdata->local);
af8cdcd8
JB		 953
954 return 0;
955}
Linux kernel - Deliverables
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