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Johannes Berg46900292009-02-15 12:44:28 +01001/*
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"
Johannes Berg24487982009-04-23 18:52:52 +020025#include "driver-ops.h"
Johannes Berg46900292009-02-15 12:44:28 +010026#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)
Alina Friedrichsen4a332a32009-02-22 18:19:33 +010033#define IEEE80211_IBSS_MERGE_DELAY 0x400000
Johannes Berg46900292009-02-15 12:44:28 +010034#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,
Johannes Bergfffd0932009-07-08 14:22:54 +020060 sdata->u.ibss.bssid, NULL, 0, 0);
Johannes Berg46900292009-02-15 12:44:28 +010061}
62
Johannes Bergaf8cdcd2009-04-19 21:25:43 +020063static void __ieee80211_sta_join_ibss(struct ieee80211_sub_if_data *sdata,
64 const u8 *bssid, const int beacon_int,
65 struct ieee80211_channel *chan,
Johannes Bergb59066a2009-05-12 21:18:38 +020066 const u32 basic_rates,
Johannes Bergaf8cdcd2009-04-19 21:25:43 +020067 const u16 capability, u64 tsf)
Johannes Berg46900292009-02-15 12:44:28 +010068{
69 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
70 struct ieee80211_local *local = sdata->local;
Johannes Bergb59066a2009-05-12 21:18:38 +020071 int rates, i;
Johannes Berg46900292009-02-15 12:44:28 +010072 struct sk_buff *skb;
73 struct ieee80211_mgmt *mgmt;
74 u8 *pos;
75 struct ieee80211_supported_band *sband;
Johannes Bergf446d102009-10-28 15:12:32 +010076 struct cfg80211_bss *bss;
Johannes Berg57c4d7b2009-04-23 16:10:04 +020077 u32 bss_change;
Johannes Bergb59066a2009-05-12 21:18:38 +020078 u8 supp_rates[IEEE80211_MAX_SUPP_RATES];
Johannes Berg24487982009-04-23 18:52:52 +020079
80 /* Reset own TSF to allow time synchronization work. */
81 drv_reset_tsf(local);
Johannes Berg46900292009-02-15 12:44:28 +010082
Johannes Bergaf8cdcd2009-04-19 21:25:43 +020083 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);
Johannes Berg46900292009-02-15 12:44:28 +010090
Johannes Bergaf8cdcd2009-04-19 21:25:43 +020091 if (memcmp(ifibss->bssid, bssid, ETH_ALEN))
92 sta_info_flush(sdata->local, sdata);
Johannes Berg46900292009-02-15 12:44:28 +010093
94 memcpy(ifibss->bssid, bssid, ETH_ALEN);
Johannes Berg46900292009-02-15 12:44:28 +010095
Johannes Bergaf8cdcd2009-04-19 21:25:43 +020096 sdata->drop_unencrypted = capability & WLAN_CAPABILITY_PRIVACY ? 1 : 0;
Johannes Berg46900292009-02-15 12:44:28 +010097
Johannes Bergaf8cdcd2009-04-19 21:25:43 +020098 local->oper_channel = chan;
99 local->oper_channel_type = NL80211_CHAN_NO_HT;
100 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_CHANNEL);
Johannes Berg57c4d7b2009-04-23 16:10:04 +0200101
Johannes Bergaf8cdcd2009-04-19 21:25:43 +0200102 sband = local->hw.wiphy->bands[chan->band];
Johannes Berg46900292009-02-15 12:44:28 +0100103
Johannes Bergb59066a2009-05-12 21:18:38 +0200104 /* 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
Johannes Berg46900292009-02-15 12:44:28 +0100114 /* Build IBSS probe response */
Johannes Bergaf8cdcd2009-04-19 21:25:43 +0200115 mgmt = (void *) skb_put(skb, 24 + sizeof(mgmt->u.beacon));
Johannes Berg46900292009-02-15 12:44:28 +0100116 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);
Johannes Berg47846c92009-11-25 17:46:19 +0100120 memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
Johannes Berg46900292009-02-15 12:44:28 +0100121 memcpy(mgmt->bssid, ifibss->bssid, ETH_ALEN);
Johannes Berg57c4d7b2009-04-23 16:10:04 +0200122 mgmt->u.beacon.beacon_int = cpu_to_le16(beacon_int);
Sujith707c1b42009-03-03 10:15:10 +0530123 mgmt->u.beacon.timestamp = cpu_to_le64(tsf);
Johannes Berg46900292009-02-15 12:44:28 +0100124 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
Johannes Bergb59066a2009-05-12 21:18:38 +0200131 rates = sband->n_bitrates;
Johannes Berg46900292009-02-15 12:44:28 +0100132 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;
Johannes Bergaf8cdcd2009-04-19 21:25:43 +0200143 *pos++ = ieee80211_frequency_to_channel(chan->center_freq);
Johannes Berg46900292009-02-15 12:44:28 +0100144 }
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
Johannes Bergb59066a2009-05-12 21:18:38 +0200153 if (sband->n_bitrates > 8) {
154 rates = sband->n_bitrates - 8;
Johannes Berg46900292009-02-15 12:44:28 +0100155 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
Johannes Bergaf8cdcd2009-04-19 21:25:43 +0200161 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);
Johannes Berg46900292009-02-15 12:44:28 +0100166
Johannes Berg2d0ddec2009-04-23 16:13:26 +0200167 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);
Johannes Berg46900292009-02-15 12:44:28 +0100174
Johannes Bergb59066a2009-05-12 21:18:38 +0200175 ieee80211_sta_def_wmm_params(sdata, sband->n_bitrates, supp_rates);
Johannes Berg46900292009-02-15 12:44:28 +0100176
Johannes Berg46900292009-02-15 12:44:28 +0100177 ifibss->state = IEEE80211_IBSS_MLME_JOINED;
Johannes Bergaf8cdcd2009-04-19 21:25:43 +0200178 mod_timer(&ifibss->timer,
179 round_jiffies(jiffies + IEEE80211_IBSS_MERGE_INTERVAL));
Johannes Berg46900292009-02-15 12:44:28 +0100180
Johannes Bergf446d102009-10-28 15:12:32 +0100181 bss = cfg80211_inform_bss_frame(local->hw.wiphy, local->hw.conf.channel,
182 mgmt, skb->len, 0, GFP_KERNEL);
183 cfg80211_put_bss(bss);
Johannes Bergaf8cdcd2009-04-19 21:25:43 +0200184 cfg80211_ibss_joined(sdata->dev, ifibss->bssid, GFP_KERNEL);
Johannes Berg46900292009-02-15 12:44:28 +0100185}
186
Johannes Bergaf8cdcd2009-04-19 21:25:43 +0200187static void ieee80211_sta_join_ibss(struct ieee80211_sub_if_data *sdata,
188 struct ieee80211_bss *bss)
Johannes Berg46900292009-02-15 12:44:28 +0100189{
Johannes Berg0c1ad2c2009-12-23 13:15:39 +0100190 struct cfg80211_bss *cbss =
191 container_of((void *)bss, struct cfg80211_bss, priv);
Johannes Bergb59066a2009-05-12 21:18:38 +0200192 struct ieee80211_supported_band *sband;
193 u32 basic_rates;
194 int i, j;
Johannes Berg0c1ad2c2009-12-23 13:15:39 +0100195 u16 beacon_int = cbss->beacon_interval;
Johannes Berg57c4d7b2009-04-23 16:10:04 +0200196
197 if (beacon_int < 10)
198 beacon_int = 10;
199
Johannes Berg0c1ad2c2009-12-23 13:15:39 +0100200 sband = sdata->local->hw.wiphy->bands[cbss->channel->band];
Johannes Bergb59066a2009-05-12 21:18:38 +0200201
202 basic_rates = 0;
203
204 for (i = 0; i < bss->supp_rates_len; i++) {
205 int rate = (bss->supp_rates[i] & 0x7f) * 5;
206 bool is_basic = !!(bss->supp_rates[i] & 0x80);
207
208 for (j = 0; j < sband->n_bitrates; j++) {
209 if (sband->bitrates[j].bitrate == rate) {
210 if (is_basic)
211 basic_rates |= BIT(j);
212 break;
213 }
214 }
215 }
216
Johannes Berg0c1ad2c2009-12-23 13:15:39 +0100217 __ieee80211_sta_join_ibss(sdata, cbss->bssid,
Johannes Berg57c4d7b2009-04-23 16:10:04 +0200218 beacon_int,
Johannes Berg0c1ad2c2009-12-23 13:15:39 +0100219 cbss->channel,
Johannes Bergb59066a2009-05-12 21:18:38 +0200220 basic_rates,
Johannes Berg0c1ad2c2009-12-23 13:15:39 +0100221 cbss->capability,
222 cbss->tsf);
Johannes Berg46900292009-02-15 12:44:28 +0100223}
224
225static void ieee80211_rx_bss_info(struct ieee80211_sub_if_data *sdata,
226 struct ieee80211_mgmt *mgmt,
227 size_t len,
228 struct ieee80211_rx_status *rx_status,
229 struct ieee802_11_elems *elems,
230 bool beacon)
231{
232 struct ieee80211_local *local = sdata->local;
233 int freq;
Johannes Berg0c1ad2c2009-12-23 13:15:39 +0100234 struct cfg80211_bss *cbss;
Johannes Berg46900292009-02-15 12:44:28 +0100235 struct ieee80211_bss *bss;
236 struct sta_info *sta;
237 struct ieee80211_channel *channel;
238 u64 beacon_timestamp, rx_timestamp;
239 u32 supp_rates = 0;
240 enum ieee80211_band band = rx_status->band;
241
242 if (elems->ds_params && elems->ds_params_len == 1)
243 freq = ieee80211_channel_to_frequency(elems->ds_params[0]);
244 else
245 freq = rx_status->freq;
246
247 channel = ieee80211_get_channel(local->hw.wiphy, freq);
248
249 if (!channel || channel->flags & IEEE80211_CHAN_DISABLED)
250 return;
251
252 if (sdata->vif.type == NL80211_IFTYPE_ADHOC && elems->supp_rates &&
253 memcmp(mgmt->bssid, sdata->u.ibss.bssid, ETH_ALEN) == 0) {
254 supp_rates = ieee80211_sta_get_rates(local, elems, band);
255
256 rcu_read_lock();
257
Johannes Bergabe60632009-11-25 17:46:18 +0100258 sta = sta_info_get(sdata, mgmt->sa);
Johannes Berg46900292009-02-15 12:44:28 +0100259 if (sta) {
260 u32 prev_rates;
261
262 prev_rates = sta->sta.supp_rates[band];
263 /* make sure mandatory rates are always added */
264 sta->sta.supp_rates[band] = supp_rates |
265 ieee80211_mandatory_rates(local, band);
266
267#ifdef CONFIG_MAC80211_IBSS_DEBUG
268 if (sta->sta.supp_rates[band] != prev_rates)
269 printk(KERN_DEBUG "%s: updated supp_rates set "
270 "for %pM based on beacon info (0x%llx | "
271 "0x%llx -> 0x%llx)\n",
Johannes Berg47846c92009-11-25 17:46:19 +0100272 sdata->name,
Johannes Berg46900292009-02-15 12:44:28 +0100273 sta->sta.addr,
274 (unsigned long long) prev_rates,
275 (unsigned long long) supp_rates,
276 (unsigned long long) sta->sta.supp_rates[band]);
277#endif
Johannes Berg34e89502010-02-03 13:59:58 +0100278 rcu_read_unlock();
279 } else {
280 rcu_read_unlock();
281 ieee80211_ibss_add_sta(sdata, mgmt->bssid, mgmt->sa,
282 supp_rates, GFP_KERNEL);
283 }
Johannes Berg46900292009-02-15 12:44:28 +0100284 }
285
286 bss = ieee80211_bss_info_update(local, rx_status, mgmt, len, elems,
287 channel, beacon);
288 if (!bss)
289 return;
290
Johannes Berg0c1ad2c2009-12-23 13:15:39 +0100291 cbss = container_of((void *)bss, struct cfg80211_bss, priv);
292
Johannes Berg46900292009-02-15 12:44:28 +0100293 /* was just updated in ieee80211_bss_info_update */
Johannes Berg0c1ad2c2009-12-23 13:15:39 +0100294 beacon_timestamp = cbss->tsf;
Johannes Berg46900292009-02-15 12:44:28 +0100295
296 /* check if we need to merge IBSS */
297
Johannes Berg46900292009-02-15 12:44:28 +0100298 /* we use a fixed BSSID */
Benoit Papillaulta98bfec2010-01-17 22:45:24 +0100299 if (sdata->u.ibss.fixed_bssid)
Johannes Berg46900292009-02-15 12:44:28 +0100300 goto put_bss;
301
302 /* not an IBSS */
Johannes Berg0c1ad2c2009-12-23 13:15:39 +0100303 if (!(cbss->capability & WLAN_CAPABILITY_IBSS))
Johannes Berg46900292009-02-15 12:44:28 +0100304 goto put_bss;
305
306 /* different channel */
Johannes Berg0c1ad2c2009-12-23 13:15:39 +0100307 if (cbss->channel != local->oper_channel)
Johannes Berg46900292009-02-15 12:44:28 +0100308 goto put_bss;
309
310 /* different SSID */
311 if (elems->ssid_len != sdata->u.ibss.ssid_len ||
312 memcmp(elems->ssid, sdata->u.ibss.ssid,
313 sdata->u.ibss.ssid_len))
314 goto put_bss;
315
Alina Friedrichsen34e8f082009-02-22 00:07:28 +0100316 /* same BSSID */
Johannes Berg0c1ad2c2009-12-23 13:15:39 +0100317 if (memcmp(cbss->bssid, sdata->u.ibss.bssid, ETH_ALEN) == 0)
Alina Friedrichsen34e8f082009-02-22 00:07:28 +0100318 goto put_bss;
319
Johannes Berg46900292009-02-15 12:44:28 +0100320 if (rx_status->flag & RX_FLAG_TSFT) {
321 /*
322 * For correct IBSS merging we need mactime; since mactime is
323 * defined as the time the first data symbol of the frame hits
324 * the PHY, and the timestamp of the beacon is defined as "the
325 * time that the data symbol containing the first bit of the
326 * timestamp is transmitted to the PHY plus the transmitting
327 * STA's delays through its local PHY from the MAC-PHY
328 * interface to its interface with the WM" (802.11 11.1.2)
329 * - equals the time this bit arrives at the receiver - we have
330 * to take into account the offset between the two.
331 *
332 * E.g. at 1 MBit that means mactime is 192 usec earlier
333 * (=24 bytes * 8 usecs/byte) than the beacon timestamp.
334 */
335 int rate;
336
337 if (rx_status->flag & RX_FLAG_HT)
338 rate = 65; /* TODO: HT rates */
339 else
340 rate = local->hw.wiphy->bands[band]->
341 bitrates[rx_status->rate_idx].bitrate;
342
343 rx_timestamp = rx_status->mactime + (24 * 8 * 10 / rate);
Johannes Berg24487982009-04-23 18:52:52 +0200344 } else {
345 /*
346 * second best option: get current TSF
347 * (will return -1 if not supported)
348 */
349 rx_timestamp = drv_get_tsf(local);
350 }
Johannes Berg46900292009-02-15 12:44:28 +0100351
352#ifdef CONFIG_MAC80211_IBSS_DEBUG
353 printk(KERN_DEBUG "RX beacon SA=%pM BSSID="
354 "%pM TSF=0x%llx BCN=0x%llx diff=%lld @%lu\n",
355 mgmt->sa, mgmt->bssid,
356 (unsigned long long)rx_timestamp,
357 (unsigned long long)beacon_timestamp,
358 (unsigned long long)(rx_timestamp - beacon_timestamp),
359 jiffies);
360#endif
361
Alina Friedrichsen4a332a32009-02-22 18:19:33 +0100362 /* give slow hardware some time to do the TSF sync */
363 if (rx_timestamp < IEEE80211_IBSS_MERGE_DELAY)
364 goto put_bss;
365
Johannes Berg46900292009-02-15 12:44:28 +0100366 if (beacon_timestamp > rx_timestamp) {
367#ifdef CONFIG_MAC80211_IBSS_DEBUG
368 printk(KERN_DEBUG "%s: beacon TSF higher than "
369 "local TSF - IBSS merge with BSSID %pM\n",
Johannes Berg47846c92009-11-25 17:46:19 +0100370 sdata->name, mgmt->bssid);
Johannes Berg46900292009-02-15 12:44:28 +0100371#endif
372 ieee80211_sta_join_ibss(sdata, bss);
Johannes Berg34e89502010-02-03 13:59:58 +0100373 ieee80211_ibss_add_sta(sdata, mgmt->bssid, mgmt->sa,
374 supp_rates, GFP_KERNEL);
Johannes Berg46900292009-02-15 12:44:28 +0100375 }
376
377 put_bss:
378 ieee80211_rx_bss_put(local, bss);
379}
380
381/*
382 * Add a new IBSS station, will also be called by the RX code when,
383 * in IBSS mode, receiving a frame from a yet-unknown station, hence
384 * must be callable in atomic context.
385 */
386struct sta_info *ieee80211_ibss_add_sta(struct ieee80211_sub_if_data *sdata,
Johannes Berg34e89502010-02-03 13:59:58 +0100387 u8 *bssid,u8 *addr, u32 supp_rates,
388 gfp_t gfp)
Johannes Berg46900292009-02-15 12:44:28 +0100389{
Felix Fietkau2e10d332009-12-20 19:07:09 +0100390 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
Johannes Berg46900292009-02-15 12:44:28 +0100391 struct ieee80211_local *local = sdata->local;
392 struct sta_info *sta;
393 int band = local->hw.conf.channel->band;
394
Johannes Bergaf8cdcd2009-04-19 21:25:43 +0200395 /*
396 * XXX: Consider removing the least recently used entry and
397 * allow new one to be added.
398 */
Johannes Berg46900292009-02-15 12:44:28 +0100399 if (local->num_sta >= IEEE80211_IBSS_MAX_STA_ENTRIES) {
Johannes Bergaf8cdcd2009-04-19 21:25:43 +0200400 if (net_ratelimit())
401 printk(KERN_DEBUG "%s: No room for a new IBSS STA entry %pM\n",
Johannes Berg47846c92009-11-25 17:46:19 +0100402 sdata->name, addr);
Johannes Berg46900292009-02-15 12:44:28 +0100403 return NULL;
404 }
405
Felix Fietkau2e10d332009-12-20 19:07:09 +0100406 if (ifibss->state == IEEE80211_IBSS_MLME_SEARCH)
407 return NULL;
408
Johannes Berg46900292009-02-15 12:44:28 +0100409 if (compare_ether_addr(bssid, sdata->u.ibss.bssid))
410 return NULL;
411
412#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
413 printk(KERN_DEBUG "%s: Adding new IBSS station %pM (dev=%s)\n",
Johannes Berg47846c92009-11-25 17:46:19 +0100414 wiphy_name(local->hw.wiphy), addr, sdata->name);
Johannes Berg46900292009-02-15 12:44:28 +0100415#endif
416
Johannes Berg34e89502010-02-03 13:59:58 +0100417 sta = sta_info_alloc(sdata, addr, gfp);
Johannes Berg46900292009-02-15 12:44:28 +0100418 if (!sta)
419 return NULL;
420
421 set_sta_flags(sta, WLAN_STA_AUTHORIZED);
422
423 /* make sure mandatory rates are always added */
424 sta->sta.supp_rates[band] = supp_rates |
425 ieee80211_mandatory_rates(local, band);
426
427 rate_control_rate_init(sta);
428
Johannes Berg34e89502010-02-03 13:59:58 +0100429 /* If it fails, maybe we raced another insertion? */
Johannes Berg46900292009-02-15 12:44:28 +0100430 if (sta_info_insert(sta))
Johannes Berg34e89502010-02-03 13:59:58 +0100431 return sta_info_get(sdata, addr);
Johannes Berg46900292009-02-15 12:44:28 +0100432 return sta;
433}
434
435static int ieee80211_sta_active_ibss(struct ieee80211_sub_if_data *sdata)
436{
437 struct ieee80211_local *local = sdata->local;
438 int active = 0;
439 struct sta_info *sta;
440
441 rcu_read_lock();
442
443 list_for_each_entry_rcu(sta, &local->sta_list, list) {
444 if (sta->sdata == sdata &&
445 time_after(sta->last_rx + IEEE80211_IBSS_MERGE_INTERVAL,
446 jiffies)) {
447 active++;
448 break;
449 }
450 }
451
452 rcu_read_unlock();
453
454 return active;
455}
456
Benoit Papillaultce9058a2010-01-17 22:45:23 +0100457/*
458 * This function is called with state == IEEE80211_IBSS_MLME_JOINED
459 */
Johannes Berg46900292009-02-15 12:44:28 +0100460
461static void ieee80211_sta_merge_ibss(struct ieee80211_sub_if_data *sdata)
462{
463 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
464
Johannes Bergaf8cdcd2009-04-19 21:25:43 +0200465 mod_timer(&ifibss->timer,
466 round_jiffies(jiffies + IEEE80211_IBSS_MERGE_INTERVAL));
Johannes Berg46900292009-02-15 12:44:28 +0100467
468 ieee80211_sta_expire(sdata, IEEE80211_IBSS_INACTIVITY_LIMIT);
Johannes Bergaf8cdcd2009-04-19 21:25:43 +0200469
Sujith450aae32009-11-02 12:33:23 +0530470 if (time_before(jiffies, ifibss->last_scan_completed +
471 IEEE80211_IBSS_MERGE_INTERVAL))
472 return;
473
Johannes Berg46900292009-02-15 12:44:28 +0100474 if (ieee80211_sta_active_ibss(sdata))
475 return;
476
Johannes Bergaf8cdcd2009-04-19 21:25:43 +0200477 if (ifibss->fixed_channel)
Johannes Berg46900292009-02-15 12:44:28 +0100478 return;
479
480 printk(KERN_DEBUG "%s: No active IBSS STAs - trying to scan for other "
Johannes Berg47846c92009-11-25 17:46:19 +0100481 "IBSS networks with same SSID (merge)\n", sdata->name);
Johannes Berg46900292009-02-15 12:44:28 +0100482
Johannes Bergf3b85252009-04-23 16:01:47 +0200483 ieee80211_request_internal_scan(sdata, ifibss->ssid, ifibss->ssid_len);
Johannes Berg46900292009-02-15 12:44:28 +0100484}
485
Johannes Bergaf8cdcd2009-04-19 21:25:43 +0200486static void ieee80211_sta_create_ibss(struct ieee80211_sub_if_data *sdata)
Johannes Berg46900292009-02-15 12:44:28 +0100487{
488 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
489 struct ieee80211_local *local = sdata->local;
490 struct ieee80211_supported_band *sband;
Johannes Berg46900292009-02-15 12:44:28 +0100491 u8 bssid[ETH_ALEN];
Johannes Berg46900292009-02-15 12:44:28 +0100492 u16 capability;
493 int i;
494
Johannes Bergaf8cdcd2009-04-19 21:25:43 +0200495 if (ifibss->fixed_bssid) {
Johannes Berg46900292009-02-15 12:44:28 +0100496 memcpy(bssid, ifibss->bssid, ETH_ALEN);
497 } else {
498 /* Generate random, not broadcast, locally administered BSSID. Mix in
499 * own MAC address to make sure that devices that do not have proper
500 * random number generator get different BSSID. */
501 get_random_bytes(bssid, ETH_ALEN);
502 for (i = 0; i < ETH_ALEN; i++)
Johannes Berg47846c92009-11-25 17:46:19 +0100503 bssid[i] ^= sdata->vif.addr[i];
Johannes Berg46900292009-02-15 12:44:28 +0100504 bssid[0] &= ~0x01;
505 bssid[0] |= 0x02;
506 }
507
508 printk(KERN_DEBUG "%s: Creating new IBSS network, BSSID %pM\n",
Johannes Berg47846c92009-11-25 17:46:19 +0100509 sdata->name, bssid);
Johannes Berg46900292009-02-15 12:44:28 +0100510
Johannes Bergaf8cdcd2009-04-19 21:25:43 +0200511 sband = local->hw.wiphy->bands[ifibss->channel->band];
Johannes Berg46900292009-02-15 12:44:28 +0100512
Johannes Berg46900292009-02-15 12:44:28 +0100513 capability = WLAN_CAPABILITY_IBSS;
514
Johannes Bergfffd0932009-07-08 14:22:54 +0200515 if (ifibss->privacy)
Johannes Berg46900292009-02-15 12:44:28 +0100516 capability |= WLAN_CAPABILITY_PRIVACY;
517 else
518 sdata->drop_unencrypted = 0;
519
Johannes Berg57c4d7b2009-04-23 16:10:04 +0200520 __ieee80211_sta_join_ibss(sdata, bssid, sdata->vif.bss_conf.beacon_int,
Johannes Bergb59066a2009-05-12 21:18:38 +0200521 ifibss->channel, 3, /* first two are basic */
522 capability, 0);
Johannes Berg46900292009-02-15 12:44:28 +0100523}
524
Benoit Papillaultce9058a2010-01-17 22:45:23 +0100525/*
526 * This function is called with state == IEEE80211_IBSS_MLME_SEARCH
527 */
528
Johannes Bergaf8cdcd2009-04-19 21:25:43 +0200529static void ieee80211_sta_find_ibss(struct ieee80211_sub_if_data *sdata)
Johannes Berg46900292009-02-15 12:44:28 +0100530{
531 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
532 struct ieee80211_local *local = sdata->local;
Johannes Berg0c1ad2c2009-12-23 13:15:39 +0100533 struct cfg80211_bss *cbss;
Johannes Bergaf8cdcd2009-04-19 21:25:43 +0200534 struct ieee80211_channel *chan = NULL;
Johannes Berg46900292009-02-15 12:44:28 +0100535 const u8 *bssid = NULL;
536 int active_ibss;
Johannes Berge0d61882009-05-12 20:47:32 +0200537 u16 capability;
Johannes Berg46900292009-02-15 12:44:28 +0100538
Johannes Berg46900292009-02-15 12:44:28 +0100539 active_ibss = ieee80211_sta_active_ibss(sdata);
540#ifdef CONFIG_MAC80211_IBSS_DEBUG
541 printk(KERN_DEBUG "%s: sta_find_ibss (active_ibss=%d)\n",
Johannes Berg47846c92009-11-25 17:46:19 +0100542 sdata->name, active_ibss);
Johannes Berg46900292009-02-15 12:44:28 +0100543#endif /* CONFIG_MAC80211_IBSS_DEBUG */
544
545 if (active_ibss)
Johannes Bergaf8cdcd2009-04-19 21:25:43 +0200546 return;
Johannes Berg46900292009-02-15 12:44:28 +0100547
Johannes Berge0d61882009-05-12 20:47:32 +0200548 capability = WLAN_CAPABILITY_IBSS;
Johannes Bergfffd0932009-07-08 14:22:54 +0200549 if (ifibss->privacy)
Johannes Berge0d61882009-05-12 20:47:32 +0200550 capability |= WLAN_CAPABILITY_PRIVACY;
Johannes Bergaf8cdcd2009-04-19 21:25:43 +0200551 if (ifibss->fixed_bssid)
Johannes Berg46900292009-02-15 12:44:28 +0100552 bssid = ifibss->bssid;
Johannes Bergaf8cdcd2009-04-19 21:25:43 +0200553 if (ifibss->fixed_channel)
554 chan = ifibss->channel;
555 if (!is_zero_ether_addr(ifibss->bssid))
556 bssid = ifibss->bssid;
Johannes Berg0c1ad2c2009-12-23 13:15:39 +0100557 cbss = cfg80211_get_bss(local->hw.wiphy, chan, bssid,
558 ifibss->ssid, ifibss->ssid_len,
559 WLAN_CAPABILITY_IBSS | WLAN_CAPABILITY_PRIVACY,
560 capability);
Johannes Berg46900292009-02-15 12:44:28 +0100561
Johannes Berg0c1ad2c2009-12-23 13:15:39 +0100562 if (cbss) {
563 struct ieee80211_bss *bss;
564
565 bss = (void *)cbss->priv;
Johannes Berg46900292009-02-15 12:44:28 +0100566#ifdef CONFIG_MAC80211_IBSS_DEBUG
Johannes Berg46900292009-02-15 12:44:28 +0100567 printk(KERN_DEBUG " sta_find_ibss: selected %pM current "
Johannes Berg0c1ad2c2009-12-23 13:15:39 +0100568 "%pM\n", cbss->bssid, ifibss->bssid);
Johannes Berg46900292009-02-15 12:44:28 +0100569#endif /* CONFIG_MAC80211_IBSS_DEBUG */
570
Johannes Berg46900292009-02-15 12:44:28 +0100571 printk(KERN_DEBUG "%s: Selected IBSS BSSID %pM"
572 " based on configured SSID\n",
Johannes Berg0c1ad2c2009-12-23 13:15:39 +0100573 sdata->name, cbss->bssid);
Johannes Berg46900292009-02-15 12:44:28 +0100574
Johannes Bergaf8cdcd2009-04-19 21:25:43 +0200575 ieee80211_sta_join_ibss(sdata, bss);
Johannes Berg46900292009-02-15 12:44:28 +0100576 ieee80211_rx_bss_put(local, bss);
Johannes Bergaf8cdcd2009-04-19 21:25:43 +0200577 return;
Reinette Chatred419b9f2009-10-19 14:55:37 -0700578 }
Johannes Berg46900292009-02-15 12:44:28 +0100579
580#ifdef CONFIG_MAC80211_IBSS_DEBUG
581 printk(KERN_DEBUG " did not try to join ibss\n");
582#endif /* CONFIG_MAC80211_IBSS_DEBUG */
583
584 /* Selected IBSS not found in current scan results - try to scan */
Benoit Papillaultce9058a2010-01-17 22:45:23 +0100585 if (time_after(jiffies, ifibss->last_scan_completed +
Johannes Berg46900292009-02-15 12:44:28 +0100586 IEEE80211_SCAN_INTERVAL)) {
587 printk(KERN_DEBUG "%s: Trigger new scan to find an IBSS to "
Johannes Berg47846c92009-11-25 17:46:19 +0100588 "join\n", sdata->name);
Johannes Berg46900292009-02-15 12:44:28 +0100589
Johannes Bergf3b85252009-04-23 16:01:47 +0200590 ieee80211_request_internal_scan(sdata, ifibss->ssid,
591 ifibss->ssid_len);
Benoit Papillaultce9058a2010-01-17 22:45:23 +0100592 } else {
Johannes Berg46900292009-02-15 12:44:28 +0100593 int interval = IEEE80211_SCAN_INTERVAL;
594
595 if (time_after(jiffies, ifibss->ibss_join_req +
596 IEEE80211_IBSS_JOIN_TIMEOUT)) {
Johannes Bergaf8cdcd2009-04-19 21:25:43 +0200597 if (!(local->oper_channel->flags & IEEE80211_CHAN_NO_IBSS)) {
598 ieee80211_sta_create_ibss(sdata);
599 return;
600 }
Johannes Berg46900292009-02-15 12:44:28 +0100601 printk(KERN_DEBUG "%s: IBSS not allowed on"
Johannes Berg47846c92009-11-25 17:46:19 +0100602 " %d MHz\n", sdata->name,
Johannes Berg46900292009-02-15 12:44:28 +0100603 local->hw.conf.channel->center_freq);
604
605 /* No IBSS found - decrease scan interval and continue
606 * scanning. */
607 interval = IEEE80211_SCAN_INTERVAL_SLOW;
608 }
609
Johannes Bergaf8cdcd2009-04-19 21:25:43 +0200610 mod_timer(&ifibss->timer,
611 round_jiffies(jiffies + interval));
Johannes Berg46900292009-02-15 12:44:28 +0100612 }
Johannes Berg46900292009-02-15 12:44:28 +0100613}
614
615static void ieee80211_rx_mgmt_probe_req(struct ieee80211_sub_if_data *sdata,
616 struct ieee80211_mgmt *mgmt,
617 size_t len)
618{
619 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
620 struct ieee80211_local *local = sdata->local;
621 int tx_last_beacon;
622 struct sk_buff *skb;
623 struct ieee80211_mgmt *resp;
624 u8 *pos, *end;
625
626 if (ifibss->state != IEEE80211_IBSS_MLME_JOINED ||
Johannes Bergaf8cdcd2009-04-19 21:25:43 +0200627 len < 24 + 2 || !ifibss->presp)
Johannes Berg46900292009-02-15 12:44:28 +0100628 return;
629
Johannes Berg24487982009-04-23 18:52:52 +0200630 tx_last_beacon = drv_tx_last_beacon(local);
Johannes Berg46900292009-02-15 12:44:28 +0100631
632#ifdef CONFIG_MAC80211_IBSS_DEBUG
633 printk(KERN_DEBUG "%s: RX ProbeReq SA=%pM DA=%pM BSSID=%pM"
634 " (tx_last_beacon=%d)\n",
Johannes Berg47846c92009-11-25 17:46:19 +0100635 sdata->name, mgmt->sa, mgmt->da,
Johannes Berg46900292009-02-15 12:44:28 +0100636 mgmt->bssid, tx_last_beacon);
637#endif /* CONFIG_MAC80211_IBSS_DEBUG */
638
639 if (!tx_last_beacon)
640 return;
641
642 if (memcmp(mgmt->bssid, ifibss->bssid, ETH_ALEN) != 0 &&
643 memcmp(mgmt->bssid, "\xff\xff\xff\xff\xff\xff", ETH_ALEN) != 0)
644 return;
645
646 end = ((u8 *) mgmt) + len;
647 pos = mgmt->u.probe_req.variable;
648 if (pos[0] != WLAN_EID_SSID ||
649 pos + 2 + pos[1] > end) {
650#ifdef CONFIG_MAC80211_IBSS_DEBUG
651 printk(KERN_DEBUG "%s: Invalid SSID IE in ProbeReq "
652 "from %pM\n",
Johannes Berg47846c92009-11-25 17:46:19 +0100653 sdata->name, mgmt->sa);
Johannes Berg46900292009-02-15 12:44:28 +0100654#endif
655 return;
656 }
657 if (pos[1] != 0 &&
658 (pos[1] != ifibss->ssid_len ||
Benoit Papillault0da780c2010-02-05 01:21:03 +0100659 memcmp(pos + 2, ifibss->ssid, ifibss->ssid_len))) {
Johannes Berg46900292009-02-15 12:44:28 +0100660 /* Ignore ProbeReq for foreign SSID */
661 return;
662 }
663
664 /* Reply with ProbeResp */
Johannes Bergaf8cdcd2009-04-19 21:25:43 +0200665 skb = skb_copy(ifibss->presp, GFP_KERNEL);
Johannes Berg46900292009-02-15 12:44:28 +0100666 if (!skb)
667 return;
668
669 resp = (struct ieee80211_mgmt *) skb->data;
670 memcpy(resp->da, mgmt->sa, ETH_ALEN);
671#ifdef CONFIG_MAC80211_IBSS_DEBUG
672 printk(KERN_DEBUG "%s: Sending ProbeResp to %pM\n",
Johannes Berg47846c92009-11-25 17:46:19 +0100673 sdata->name, resp->da);
Johannes Berg46900292009-02-15 12:44:28 +0100674#endif /* CONFIG_MAC80211_IBSS_DEBUG */
Johannes Berg62ae67b2009-11-18 18:42:05 +0100675 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
676 ieee80211_tx_skb(sdata, skb);
Johannes Berg46900292009-02-15 12:44:28 +0100677}
678
679static void ieee80211_rx_mgmt_probe_resp(struct ieee80211_sub_if_data *sdata,
680 struct ieee80211_mgmt *mgmt,
681 size_t len,
682 struct ieee80211_rx_status *rx_status)
683{
684 size_t baselen;
685 struct ieee802_11_elems elems;
686
Johannes Berg47846c92009-11-25 17:46:19 +0100687 if (memcmp(mgmt->da, sdata->vif.addr, ETH_ALEN))
Johannes Berg46900292009-02-15 12:44:28 +0100688 return; /* ignore ProbeResp to foreign address */
689
690 baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt;
691 if (baselen > len)
692 return;
693
694 ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen,
695 &elems);
696
697 ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems, false);
698}
699
700static void ieee80211_rx_mgmt_beacon(struct ieee80211_sub_if_data *sdata,
701 struct ieee80211_mgmt *mgmt,
702 size_t len,
703 struct ieee80211_rx_status *rx_status)
704{
705 size_t baselen;
706 struct ieee802_11_elems elems;
707
708 /* Process beacon from the current BSS */
709 baselen = (u8 *) mgmt->u.beacon.variable - (u8 *) mgmt;
710 if (baselen > len)
711 return;
712
713 ieee802_11_parse_elems(mgmt->u.beacon.variable, len - baselen, &elems);
714
715 ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems, true);
716}
717
718static void ieee80211_ibss_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata,
719 struct sk_buff *skb)
720{
721 struct ieee80211_rx_status *rx_status;
722 struct ieee80211_mgmt *mgmt;
723 u16 fc;
724
Johannes Bergf1d58c22009-06-17 13:13:00 +0200725 rx_status = IEEE80211_SKB_RXCB(skb);
Johannes Berg46900292009-02-15 12:44:28 +0100726 mgmt = (struct ieee80211_mgmt *) skb->data;
727 fc = le16_to_cpu(mgmt->frame_control);
728
729 switch (fc & IEEE80211_FCTL_STYPE) {
730 case IEEE80211_STYPE_PROBE_REQ:
731 ieee80211_rx_mgmt_probe_req(sdata, mgmt, skb->len);
732 break;
733 case IEEE80211_STYPE_PROBE_RESP:
734 ieee80211_rx_mgmt_probe_resp(sdata, mgmt, skb->len,
735 rx_status);
736 break;
737 case IEEE80211_STYPE_BEACON:
738 ieee80211_rx_mgmt_beacon(sdata, mgmt, skb->len,
739 rx_status);
740 break;
741 case IEEE80211_STYPE_AUTH:
742 ieee80211_rx_mgmt_auth_ibss(sdata, mgmt, skb->len);
743 break;
744 }
745
746 kfree_skb(skb);
747}
748
749static void ieee80211_ibss_work(struct work_struct *work)
750{
751 struct ieee80211_sub_if_data *sdata =
752 container_of(work, struct ieee80211_sub_if_data, u.ibss.work);
753 struct ieee80211_local *local = sdata->local;
754 struct ieee80211_if_ibss *ifibss;
755 struct sk_buff *skb;
756
Johannes Berg5bb644a2009-05-17 11:40:42 +0200757 if (WARN_ON(local->suspended))
758 return;
759
Johannes Berg9607e6b2009-12-23 13:15:31 +0100760 if (!ieee80211_sdata_running(sdata))
Johannes Berg46900292009-02-15 12:44:28 +0100761 return;
762
Helmut Schaafbe9c422009-07-23 12:14:04 +0200763 if (local->scanning)
Johannes Berg46900292009-02-15 12:44:28 +0100764 return;
765
766 if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_ADHOC))
767 return;
768 ifibss = &sdata->u.ibss;
769
770 while ((skb = skb_dequeue(&ifibss->skb_queue)))
771 ieee80211_ibss_rx_queued_mgmt(sdata, skb);
772
773 if (!test_and_clear_bit(IEEE80211_IBSS_REQ_RUN, &ifibss->request))
774 return;
775
776 switch (ifibss->state) {
777 case IEEE80211_IBSS_MLME_SEARCH:
778 ieee80211_sta_find_ibss(sdata);
779 break;
780 case IEEE80211_IBSS_MLME_JOINED:
781 ieee80211_sta_merge_ibss(sdata);
782 break;
783 default:
784 WARN_ON(1);
785 break;
786 }
787}
788
789static void ieee80211_ibss_timer(unsigned long data)
790{
791 struct ieee80211_sub_if_data *sdata =
792 (struct ieee80211_sub_if_data *) data;
793 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
794 struct ieee80211_local *local = sdata->local;
795
Johannes Berg5bb644a2009-05-17 11:40:42 +0200796 if (local->quiescing) {
797 ifibss->timer_running = true;
798 return;
799 }
800
Johannes Berg46900292009-02-15 12:44:28 +0100801 set_bit(IEEE80211_IBSS_REQ_RUN, &ifibss->request);
Luis R. Rodriguez42935ec2009-07-29 20:08:07 -0400802 ieee80211_queue_work(&local->hw, &ifibss->work);
Johannes Berg46900292009-02-15 12:44:28 +0100803}
804
Johannes Berg5bb644a2009-05-17 11:40:42 +0200805#ifdef CONFIG_PM
806void ieee80211_ibss_quiesce(struct ieee80211_sub_if_data *sdata)
807{
808 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
809
810 cancel_work_sync(&ifibss->work);
811 if (del_timer_sync(&ifibss->timer))
812 ifibss->timer_running = true;
813}
814
815void ieee80211_ibss_restart(struct ieee80211_sub_if_data *sdata)
816{
817 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
818
819 if (ifibss->timer_running) {
820 add_timer(&ifibss->timer);
821 ifibss->timer_running = false;
822 }
823}
824#endif
825
Johannes Berg46900292009-02-15 12:44:28 +0100826void ieee80211_ibss_setup_sdata(struct ieee80211_sub_if_data *sdata)
827{
828 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
829
830 INIT_WORK(&ifibss->work, ieee80211_ibss_work);
831 setup_timer(&ifibss->timer, ieee80211_ibss_timer,
832 (unsigned long) sdata);
833 skb_queue_head_init(&ifibss->skb_queue);
Johannes Berg46900292009-02-15 12:44:28 +0100834}
835
836/* scan finished notification */
837void ieee80211_ibss_notify_scan_completed(struct ieee80211_local *local)
838{
Johannes Bergaf8cdcd2009-04-19 21:25:43 +0200839 struct ieee80211_sub_if_data *sdata;
Johannes Berg46900292009-02-15 12:44:28 +0100840
Johannes Berg29b4a4f2009-04-21 00:30:49 +0200841 mutex_lock(&local->iflist_mtx);
842 list_for_each_entry(sdata, &local->interfaces, list) {
Johannes Berg9607e6b2009-12-23 13:15:31 +0100843 if (!ieee80211_sdata_running(sdata))
Johannes Berg0e41f712009-04-23 11:48:56 +0200844 continue;
Johannes Bergaf8cdcd2009-04-19 21:25:43 +0200845 if (sdata->vif.type != NL80211_IFTYPE_ADHOC)
846 continue;
Johannes Berg0e41f712009-04-23 11:48:56 +0200847 if (!sdata->u.ibss.ssid_len)
848 continue;
Johannes Bergaf8cdcd2009-04-19 21:25:43 +0200849 sdata->u.ibss.last_scan_completed = jiffies;
Johannes Berg51f98f12009-10-11 11:47:57 +0200850 mod_timer(&sdata->u.ibss.timer, 0);
Johannes Berg46900292009-02-15 12:44:28 +0100851 }
Johannes Berg29b4a4f2009-04-21 00:30:49 +0200852 mutex_unlock(&local->iflist_mtx);
Johannes Berg46900292009-02-15 12:44:28 +0100853}
854
855ieee80211_rx_result
Johannes Bergf1d58c22009-06-17 13:13:00 +0200856ieee80211_ibss_rx_mgmt(struct ieee80211_sub_if_data *sdata, struct sk_buff *skb)
Johannes Berg46900292009-02-15 12:44:28 +0100857{
858 struct ieee80211_local *local = sdata->local;
859 struct ieee80211_mgmt *mgmt;
860 u16 fc;
861
862 if (skb->len < 24)
863 return RX_DROP_MONITOR;
864
865 mgmt = (struct ieee80211_mgmt *) skb->data;
866 fc = le16_to_cpu(mgmt->frame_control);
867
868 switch (fc & IEEE80211_FCTL_STYPE) {
869 case IEEE80211_STYPE_PROBE_RESP:
870 case IEEE80211_STYPE_BEACON:
Johannes Berg46900292009-02-15 12:44:28 +0100871 case IEEE80211_STYPE_PROBE_REQ:
872 case IEEE80211_STYPE_AUTH:
873 skb_queue_tail(&sdata->u.ibss.skb_queue, skb);
Luis R. Rodriguez42935ec2009-07-29 20:08:07 -0400874 ieee80211_queue_work(&local->hw, &sdata->u.ibss.work);
Johannes Berg46900292009-02-15 12:44:28 +0100875 return RX_QUEUED;
876 }
877
878 return RX_DROP_MONITOR;
879}
Johannes Bergaf8cdcd2009-04-19 21:25:43 +0200880
881int ieee80211_ibss_join(struct ieee80211_sub_if_data *sdata,
882 struct cfg80211_ibss_params *params)
883{
884 struct sk_buff *skb;
885
Johannes Bergaf8cdcd2009-04-19 21:25:43 +0200886 if (params->bssid) {
887 memcpy(sdata->u.ibss.bssid, params->bssid, ETH_ALEN);
888 sdata->u.ibss.fixed_bssid = true;
889 } else
890 sdata->u.ibss.fixed_bssid = false;
891
Johannes Bergfffd0932009-07-08 14:22:54 +0200892 sdata->u.ibss.privacy = params->privacy;
893
Johannes Berg57c4d7b2009-04-23 16:10:04 +0200894 sdata->vif.bss_conf.beacon_int = params->beacon_interval;
895
Johannes Bergaf8cdcd2009-04-19 21:25:43 +0200896 sdata->u.ibss.channel = params->channel;
897 sdata->u.ibss.fixed_channel = params->channel_fixed;
898
899 if (params->ie) {
900 sdata->u.ibss.ie = kmemdup(params->ie, params->ie_len,
901 GFP_KERNEL);
902 if (sdata->u.ibss.ie)
903 sdata->u.ibss.ie_len = params->ie_len;
904 }
905
906 skb = dev_alloc_skb(sdata->local->hw.extra_tx_headroom +
907 36 /* bitrates */ +
908 34 /* SSID */ +
909 3 /* DS params */ +
910 4 /* IBSS params */ +
911 params->ie_len);
912 if (!skb)
913 return -ENOMEM;
914
915 sdata->u.ibss.skb = skb;
916 sdata->u.ibss.state = IEEE80211_IBSS_MLME_SEARCH;
917 sdata->u.ibss.ibss_join_req = jiffies;
918
Johannes Berg0e41f712009-04-23 11:48:56 +0200919 memcpy(sdata->u.ibss.ssid, params->ssid, IEEE80211_MAX_SSID_LEN);
920
921 /*
922 * The ssid_len setting below is used to see whether
923 * we are active, and we need all other settings
924 * before that may get visible.
925 */
926 mb();
927
928 sdata->u.ibss.ssid_len = params->ssid_len;
929
Johannes Berg5cff20e2009-04-29 12:26:17 +0200930 ieee80211_recalc_idle(sdata->local);
931
Johannes Bergaf8cdcd2009-04-19 21:25:43 +0200932 set_bit(IEEE80211_IBSS_REQ_RUN, &sdata->u.ibss.request);
Luis R. Rodriguez42935ec2009-07-29 20:08:07 -0400933 ieee80211_queue_work(&sdata->local->hw, &sdata->u.ibss.work);
Johannes Bergaf8cdcd2009-04-19 21:25:43 +0200934
935 return 0;
936}
937
938int ieee80211_ibss_leave(struct ieee80211_sub_if_data *sdata)
939{
940 struct sk_buff *skb;
941
942 del_timer_sync(&sdata->u.ibss.timer);
943 clear_bit(IEEE80211_IBSS_REQ_RUN, &sdata->u.ibss.request);
944 cancel_work_sync(&sdata->u.ibss.work);
945 clear_bit(IEEE80211_IBSS_REQ_RUN, &sdata->u.ibss.request);
946
947 sta_info_flush(sdata->local, sdata);
948
949 /* remove beacon */
950 kfree(sdata->u.ibss.ie);
951 skb = sdata->u.ibss.presp;
952 rcu_assign_pointer(sdata->u.ibss.presp, NULL);
Johannes Berg2d0ddec2009-04-23 16:13:26 +0200953 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BEACON_ENABLED);
Johannes Bergaf8cdcd2009-04-19 21:25:43 +0200954 synchronize_rcu();
955 kfree_skb(skb);
956
957 skb_queue_purge(&sdata->u.ibss.skb_queue);
958 memset(sdata->u.ibss.bssid, 0, ETH_ALEN);
Johannes Berg5cff20e2009-04-29 12:26:17 +0200959 sdata->u.ibss.ssid_len = 0;
960
961 ieee80211_recalc_idle(sdata->local);
Johannes Bergaf8cdcd2009-04-19 21:25:43 +0200962
963 return 0;
964}