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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;
Johannes Berg8fc214b2010-04-28 17:40:43 +0200173 bss_change |= BSS_CHANGED_IBSS;
174 sdata->vif.bss_conf.ibss_joined = true;
Johannes Berg2d0ddec2009-04-23 16:13:26 +0200175 ieee80211_bss_info_change_notify(sdata, bss_change);
Johannes Berg46900292009-02-15 12:44:28 +0100176
Johannes Bergb59066a2009-05-12 21:18:38 +0200177 ieee80211_sta_def_wmm_params(sdata, sband->n_bitrates, supp_rates);
Johannes Berg46900292009-02-15 12:44:28 +0100178
Johannes Berg46900292009-02-15 12:44:28 +0100179 ifibss->state = IEEE80211_IBSS_MLME_JOINED;
Johannes Bergaf8cdcd2009-04-19 21:25:43 +0200180 mod_timer(&ifibss->timer,
181 round_jiffies(jiffies + IEEE80211_IBSS_MERGE_INTERVAL));
Johannes Berg46900292009-02-15 12:44:28 +0100182
Johannes Bergf446d102009-10-28 15:12:32 +0100183 bss = cfg80211_inform_bss_frame(local->hw.wiphy, local->hw.conf.channel,
184 mgmt, skb->len, 0, GFP_KERNEL);
185 cfg80211_put_bss(bss);
Johannes Bergaf8cdcd2009-04-19 21:25:43 +0200186 cfg80211_ibss_joined(sdata->dev, ifibss->bssid, GFP_KERNEL);
Johannes Berg46900292009-02-15 12:44:28 +0100187}
188
Johannes Bergaf8cdcd2009-04-19 21:25:43 +0200189static void ieee80211_sta_join_ibss(struct ieee80211_sub_if_data *sdata,
190 struct ieee80211_bss *bss)
Johannes Berg46900292009-02-15 12:44:28 +0100191{
Johannes Berg0c1ad2c2009-12-23 13:15:39 +0100192 struct cfg80211_bss *cbss =
193 container_of((void *)bss, struct cfg80211_bss, priv);
Johannes Bergb59066a2009-05-12 21:18:38 +0200194 struct ieee80211_supported_band *sband;
195 u32 basic_rates;
196 int i, j;
Johannes Berg0c1ad2c2009-12-23 13:15:39 +0100197 u16 beacon_int = cbss->beacon_interval;
Johannes Berg57c4d7b2009-04-23 16:10:04 +0200198
199 if (beacon_int < 10)
200 beacon_int = 10;
201
Johannes Berg0c1ad2c2009-12-23 13:15:39 +0100202 sband = sdata->local->hw.wiphy->bands[cbss->channel->band];
Johannes Bergb59066a2009-05-12 21:18:38 +0200203
204 basic_rates = 0;
205
206 for (i = 0; i < bss->supp_rates_len; i++) {
207 int rate = (bss->supp_rates[i] & 0x7f) * 5;
208 bool is_basic = !!(bss->supp_rates[i] & 0x80);
209
210 for (j = 0; j < sband->n_bitrates; j++) {
211 if (sband->bitrates[j].bitrate == rate) {
212 if (is_basic)
213 basic_rates |= BIT(j);
214 break;
215 }
216 }
217 }
218
Johannes Berg0c1ad2c2009-12-23 13:15:39 +0100219 __ieee80211_sta_join_ibss(sdata, cbss->bssid,
Johannes Berg57c4d7b2009-04-23 16:10:04 +0200220 beacon_int,
Johannes Berg0c1ad2c2009-12-23 13:15:39 +0100221 cbss->channel,
Johannes Bergb59066a2009-05-12 21:18:38 +0200222 basic_rates,
Johannes Berg0c1ad2c2009-12-23 13:15:39 +0100223 cbss->capability,
224 cbss->tsf);
Johannes Berg46900292009-02-15 12:44:28 +0100225}
226
227static void ieee80211_rx_bss_info(struct ieee80211_sub_if_data *sdata,
228 struct ieee80211_mgmt *mgmt,
229 size_t len,
230 struct ieee80211_rx_status *rx_status,
231 struct ieee802_11_elems *elems,
232 bool beacon)
233{
234 struct ieee80211_local *local = sdata->local;
235 int freq;
Johannes Berg0c1ad2c2009-12-23 13:15:39 +0100236 struct cfg80211_bss *cbss;
Johannes Berg46900292009-02-15 12:44:28 +0100237 struct ieee80211_bss *bss;
238 struct sta_info *sta;
239 struct ieee80211_channel *channel;
240 u64 beacon_timestamp, rx_timestamp;
241 u32 supp_rates = 0;
242 enum ieee80211_band band = rx_status->band;
243
244 if (elems->ds_params && elems->ds_params_len == 1)
245 freq = ieee80211_channel_to_frequency(elems->ds_params[0]);
246 else
247 freq = rx_status->freq;
248
249 channel = ieee80211_get_channel(local->hw.wiphy, freq);
250
251 if (!channel || channel->flags & IEEE80211_CHAN_DISABLED)
252 return;
253
254 if (sdata->vif.type == NL80211_IFTYPE_ADHOC && elems->supp_rates &&
255 memcmp(mgmt->bssid, sdata->u.ibss.bssid, ETH_ALEN) == 0) {
256 supp_rates = ieee80211_sta_get_rates(local, elems, band);
257
258 rcu_read_lock();
259
Johannes Bergabe60632009-11-25 17:46:18 +0100260 sta = sta_info_get(sdata, mgmt->sa);
Johannes Berg46900292009-02-15 12:44:28 +0100261 if (sta) {
262 u32 prev_rates;
263
264 prev_rates = sta->sta.supp_rates[band];
265 /* make sure mandatory rates are always added */
266 sta->sta.supp_rates[band] = supp_rates |
267 ieee80211_mandatory_rates(local, band);
268
Bruno Randolf09a08cf2010-03-03 18:45:42 +0900269 if (sta->sta.supp_rates[band] != prev_rates) {
Johannes Berg46900292009-02-15 12:44:28 +0100270#ifdef CONFIG_MAC80211_IBSS_DEBUG
Johannes Berg46900292009-02-15 12:44:28 +0100271 printk(KERN_DEBUG "%s: updated supp_rates set "
Bruno Randolf09a08cf2010-03-03 18:45:42 +0900272 "for %pM based on beacon/probe_response "
273 "(0x%x -> 0x%x)\n",
274 sdata->name, sta->sta.addr,
275 prev_rates, sta->sta.supp_rates[band]);
Johannes Berg46900292009-02-15 12:44:28 +0100276#endif
Bruno Randolf09a08cf2010-03-03 18:45:42 +0900277 rate_control_rate_init(sta);
278 }
Johannes Berg34e89502010-02-03 13:59:58 +0100279 rcu_read_unlock();
280 } else {
281 rcu_read_unlock();
282 ieee80211_ibss_add_sta(sdata, mgmt->bssid, mgmt->sa,
283 supp_rates, GFP_KERNEL);
284 }
Johannes Berg46900292009-02-15 12:44:28 +0100285 }
286
287 bss = ieee80211_bss_info_update(local, rx_status, mgmt, len, elems,
288 channel, beacon);
289 if (!bss)
290 return;
291
Johannes Berg0c1ad2c2009-12-23 13:15:39 +0100292 cbss = container_of((void *)bss, struct cfg80211_bss, priv);
293
Johannes Berg46900292009-02-15 12:44:28 +0100294 /* was just updated in ieee80211_bss_info_update */
Johannes Berg0c1ad2c2009-12-23 13:15:39 +0100295 beacon_timestamp = cbss->tsf;
Johannes Berg46900292009-02-15 12:44:28 +0100296
297 /* check if we need to merge IBSS */
298
Johannes Berg46900292009-02-15 12:44:28 +0100299 /* we use a fixed BSSID */
Benoit Papillaulta98bfec2010-01-17 22:45:24 +0100300 if (sdata->u.ibss.fixed_bssid)
Johannes Berg46900292009-02-15 12:44:28 +0100301 goto put_bss;
302
303 /* not an IBSS */
Johannes Berg0c1ad2c2009-12-23 13:15:39 +0100304 if (!(cbss->capability & WLAN_CAPABILITY_IBSS))
Johannes Berg46900292009-02-15 12:44:28 +0100305 goto put_bss;
306
307 /* different channel */
Johannes Berg0c1ad2c2009-12-23 13:15:39 +0100308 if (cbss->channel != local->oper_channel)
Johannes Berg46900292009-02-15 12:44:28 +0100309 goto put_bss;
310
311 /* different SSID */
312 if (elems->ssid_len != sdata->u.ibss.ssid_len ||
313 memcmp(elems->ssid, sdata->u.ibss.ssid,
314 sdata->u.ibss.ssid_len))
315 goto put_bss;
316
Alina Friedrichsen34e8f082009-02-22 00:07:28 +0100317 /* same BSSID */
Johannes Berg0c1ad2c2009-12-23 13:15:39 +0100318 if (memcmp(cbss->bssid, sdata->u.ibss.bssid, ETH_ALEN) == 0)
Alina Friedrichsen34e8f082009-02-22 00:07:28 +0100319 goto put_bss;
320
Johannes Berg46900292009-02-15 12:44:28 +0100321 if (rx_status->flag & RX_FLAG_TSFT) {
322 /*
323 * For correct IBSS merging we need mactime; since mactime is
324 * defined as the time the first data symbol of the frame hits
325 * the PHY, and the timestamp of the beacon is defined as "the
326 * time that the data symbol containing the first bit of the
327 * timestamp is transmitted to the PHY plus the transmitting
328 * STA's delays through its local PHY from the MAC-PHY
329 * interface to its interface with the WM" (802.11 11.1.2)
330 * - equals the time this bit arrives at the receiver - we have
331 * to take into account the offset between the two.
332 *
333 * E.g. at 1 MBit that means mactime is 192 usec earlier
334 * (=24 bytes * 8 usecs/byte) than the beacon timestamp.
335 */
336 int rate;
337
338 if (rx_status->flag & RX_FLAG_HT)
339 rate = 65; /* TODO: HT rates */
340 else
341 rate = local->hw.wiphy->bands[band]->
342 bitrates[rx_status->rate_idx].bitrate;
343
344 rx_timestamp = rx_status->mactime + (24 * 8 * 10 / rate);
Johannes Berg24487982009-04-23 18:52:52 +0200345 } else {
346 /*
347 * second best option: get current TSF
348 * (will return -1 if not supported)
349 */
350 rx_timestamp = drv_get_tsf(local);
351 }
Johannes Berg46900292009-02-15 12:44:28 +0100352
353#ifdef CONFIG_MAC80211_IBSS_DEBUG
354 printk(KERN_DEBUG "RX beacon SA=%pM BSSID="
355 "%pM TSF=0x%llx BCN=0x%llx diff=%lld @%lu\n",
356 mgmt->sa, mgmt->bssid,
357 (unsigned long long)rx_timestamp,
358 (unsigned long long)beacon_timestamp,
359 (unsigned long long)(rx_timestamp - beacon_timestamp),
360 jiffies);
361#endif
362
Alina Friedrichsen4a332a32009-02-22 18:19:33 +0100363 /* give slow hardware some time to do the TSF sync */
364 if (rx_timestamp < IEEE80211_IBSS_MERGE_DELAY)
365 goto put_bss;
366
Johannes Berg46900292009-02-15 12:44:28 +0100367 if (beacon_timestamp > rx_timestamp) {
368#ifdef CONFIG_MAC80211_IBSS_DEBUG
369 printk(KERN_DEBUG "%s: beacon TSF higher than "
370 "local TSF - IBSS merge with BSSID %pM\n",
Johannes Berg47846c92009-11-25 17:46:19 +0100371 sdata->name, mgmt->bssid);
Johannes Berg46900292009-02-15 12:44:28 +0100372#endif
373 ieee80211_sta_join_ibss(sdata, bss);
Bruno Randolf09a08cf2010-03-03 18:45:42 +0900374 supp_rates = ieee80211_sta_get_rates(local, elems, band);
Johannes Berg34e89502010-02-03 13:59:58 +0100375 ieee80211_ibss_add_sta(sdata, mgmt->bssid, mgmt->sa,
376 supp_rates, GFP_KERNEL);
Johannes Berg46900292009-02-15 12:44:28 +0100377 }
378
379 put_bss:
380 ieee80211_rx_bss_put(local, bss);
381}
382
383/*
384 * Add a new IBSS station, will also be called by the RX code when,
385 * in IBSS mode, receiving a frame from a yet-unknown station, hence
386 * must be callable in atomic context.
387 */
388struct sta_info *ieee80211_ibss_add_sta(struct ieee80211_sub_if_data *sdata,
Johannes Berg34e89502010-02-03 13:59:58 +0100389 u8 *bssid,u8 *addr, u32 supp_rates,
390 gfp_t gfp)
Johannes Berg46900292009-02-15 12:44:28 +0100391{
Felix Fietkau2e10d332009-12-20 19:07:09 +0100392 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
Johannes Berg46900292009-02-15 12:44:28 +0100393 struct ieee80211_local *local = sdata->local;
394 struct sta_info *sta;
395 int band = local->hw.conf.channel->band;
396
Johannes Bergaf8cdcd2009-04-19 21:25:43 +0200397 /*
398 * XXX: Consider removing the least recently used entry and
399 * allow new one to be added.
400 */
Johannes Berg46900292009-02-15 12:44:28 +0100401 if (local->num_sta >= IEEE80211_IBSS_MAX_STA_ENTRIES) {
Johannes Bergaf8cdcd2009-04-19 21:25:43 +0200402 if (net_ratelimit())
403 printk(KERN_DEBUG "%s: No room for a new IBSS STA entry %pM\n",
Johannes Berg47846c92009-11-25 17:46:19 +0100404 sdata->name, addr);
Johannes Berg46900292009-02-15 12:44:28 +0100405 return NULL;
406 }
407
Felix Fietkau2e10d332009-12-20 19:07:09 +0100408 if (ifibss->state == IEEE80211_IBSS_MLME_SEARCH)
409 return NULL;
410
Johannes Berg46900292009-02-15 12:44:28 +0100411 if (compare_ether_addr(bssid, sdata->u.ibss.bssid))
412 return NULL;
413
414#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
415 printk(KERN_DEBUG "%s: Adding new IBSS station %pM (dev=%s)\n",
Johannes Berg47846c92009-11-25 17:46:19 +0100416 wiphy_name(local->hw.wiphy), addr, sdata->name);
Johannes Berg46900292009-02-15 12:44:28 +0100417#endif
418
Johannes Berg34e89502010-02-03 13:59:58 +0100419 sta = sta_info_alloc(sdata, addr, gfp);
Johannes Berg46900292009-02-15 12:44:28 +0100420 if (!sta)
421 return NULL;
422
423 set_sta_flags(sta, WLAN_STA_AUTHORIZED);
424
425 /* make sure mandatory rates are always added */
426 sta->sta.supp_rates[band] = supp_rates |
427 ieee80211_mandatory_rates(local, band);
428
429 rate_control_rate_init(sta);
430
Johannes Berg34e89502010-02-03 13:59:58 +0100431 /* If it fails, maybe we raced another insertion? */
Johannes Berg46900292009-02-15 12:44:28 +0100432 if (sta_info_insert(sta))
Johannes Berg34e89502010-02-03 13:59:58 +0100433 return sta_info_get(sdata, addr);
Johannes Berg46900292009-02-15 12:44:28 +0100434 return sta;
435}
436
437static int ieee80211_sta_active_ibss(struct ieee80211_sub_if_data *sdata)
438{
439 struct ieee80211_local *local = sdata->local;
440 int active = 0;
441 struct sta_info *sta;
442
443 rcu_read_lock();
444
445 list_for_each_entry_rcu(sta, &local->sta_list, list) {
446 if (sta->sdata == sdata &&
447 time_after(sta->last_rx + IEEE80211_IBSS_MERGE_INTERVAL,
448 jiffies)) {
449 active++;
450 break;
451 }
452 }
453
454 rcu_read_unlock();
455
456 return active;
457}
458
Benoit Papillaultce9058a2010-01-17 22:45:23 +0100459/*
460 * This function is called with state == IEEE80211_IBSS_MLME_JOINED
461 */
Johannes Berg46900292009-02-15 12:44:28 +0100462
463static void ieee80211_sta_merge_ibss(struct ieee80211_sub_if_data *sdata)
464{
465 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
466
Johannes Bergaf8cdcd2009-04-19 21:25:43 +0200467 mod_timer(&ifibss->timer,
468 round_jiffies(jiffies + IEEE80211_IBSS_MERGE_INTERVAL));
Johannes Berg46900292009-02-15 12:44:28 +0100469
470 ieee80211_sta_expire(sdata, IEEE80211_IBSS_INACTIVITY_LIMIT);
Johannes Bergaf8cdcd2009-04-19 21:25:43 +0200471
Sujith450aae32009-11-02 12:33:23 +0530472 if (time_before(jiffies, ifibss->last_scan_completed +
473 IEEE80211_IBSS_MERGE_INTERVAL))
474 return;
475
Johannes Berg46900292009-02-15 12:44:28 +0100476 if (ieee80211_sta_active_ibss(sdata))
477 return;
478
Johannes Bergaf8cdcd2009-04-19 21:25:43 +0200479 if (ifibss->fixed_channel)
Johannes Berg46900292009-02-15 12:44:28 +0100480 return;
481
482 printk(KERN_DEBUG "%s: No active IBSS STAs - trying to scan for other "
Johannes Berg47846c92009-11-25 17:46:19 +0100483 "IBSS networks with same SSID (merge)\n", sdata->name);
Johannes Berg46900292009-02-15 12:44:28 +0100484
Johannes Bergf3b85252009-04-23 16:01:47 +0200485 ieee80211_request_internal_scan(sdata, ifibss->ssid, ifibss->ssid_len);
Johannes Berg46900292009-02-15 12:44:28 +0100486}
487
Johannes Bergaf8cdcd2009-04-19 21:25:43 +0200488static void ieee80211_sta_create_ibss(struct ieee80211_sub_if_data *sdata)
Johannes Berg46900292009-02-15 12:44:28 +0100489{
490 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
491 struct ieee80211_local *local = sdata->local;
492 struct ieee80211_supported_band *sband;
Johannes Berg46900292009-02-15 12:44:28 +0100493 u8 bssid[ETH_ALEN];
Johannes Berg46900292009-02-15 12:44:28 +0100494 u16 capability;
495 int i;
496
Johannes Bergaf8cdcd2009-04-19 21:25:43 +0200497 if (ifibss->fixed_bssid) {
Johannes Berg46900292009-02-15 12:44:28 +0100498 memcpy(bssid, ifibss->bssid, ETH_ALEN);
499 } else {
500 /* Generate random, not broadcast, locally administered BSSID. Mix in
501 * own MAC address to make sure that devices that do not have proper
502 * random number generator get different BSSID. */
503 get_random_bytes(bssid, ETH_ALEN);
504 for (i = 0; i < ETH_ALEN; i++)
Johannes Berg47846c92009-11-25 17:46:19 +0100505 bssid[i] ^= sdata->vif.addr[i];
Johannes Berg46900292009-02-15 12:44:28 +0100506 bssid[0] &= ~0x01;
507 bssid[0] |= 0x02;
508 }
509
510 printk(KERN_DEBUG "%s: Creating new IBSS network, BSSID %pM\n",
Johannes Berg47846c92009-11-25 17:46:19 +0100511 sdata->name, bssid);
Johannes Berg46900292009-02-15 12:44:28 +0100512
Johannes Bergaf8cdcd2009-04-19 21:25:43 +0200513 sband = local->hw.wiphy->bands[ifibss->channel->band];
Johannes Berg46900292009-02-15 12:44:28 +0100514
Johannes Berg46900292009-02-15 12:44:28 +0100515 capability = WLAN_CAPABILITY_IBSS;
516
Johannes Bergfffd0932009-07-08 14:22:54 +0200517 if (ifibss->privacy)
Johannes Berg46900292009-02-15 12:44:28 +0100518 capability |= WLAN_CAPABILITY_PRIVACY;
519 else
520 sdata->drop_unencrypted = 0;
521
Johannes Berg57c4d7b2009-04-23 16:10:04 +0200522 __ieee80211_sta_join_ibss(sdata, bssid, sdata->vif.bss_conf.beacon_int,
Johannes Bergb59066a2009-05-12 21:18:38 +0200523 ifibss->channel, 3, /* first two are basic */
524 capability, 0);
Johannes Berg46900292009-02-15 12:44:28 +0100525}
526
Benoit Papillaultce9058a2010-01-17 22:45:23 +0100527/*
528 * This function is called with state == IEEE80211_IBSS_MLME_SEARCH
529 */
530
Johannes Bergaf8cdcd2009-04-19 21:25:43 +0200531static void ieee80211_sta_find_ibss(struct ieee80211_sub_if_data *sdata)
Johannes Berg46900292009-02-15 12:44:28 +0100532{
533 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
534 struct ieee80211_local *local = sdata->local;
Johannes Berg0c1ad2c2009-12-23 13:15:39 +0100535 struct cfg80211_bss *cbss;
Johannes Bergaf8cdcd2009-04-19 21:25:43 +0200536 struct ieee80211_channel *chan = NULL;
Johannes Berg46900292009-02-15 12:44:28 +0100537 const u8 *bssid = NULL;
538 int active_ibss;
Johannes Berge0d61882009-05-12 20:47:32 +0200539 u16 capability;
Johannes Berg46900292009-02-15 12:44:28 +0100540
Johannes Berg46900292009-02-15 12:44:28 +0100541 active_ibss = ieee80211_sta_active_ibss(sdata);
542#ifdef CONFIG_MAC80211_IBSS_DEBUG
543 printk(KERN_DEBUG "%s: sta_find_ibss (active_ibss=%d)\n",
Johannes Berg47846c92009-11-25 17:46:19 +0100544 sdata->name, active_ibss);
Johannes Berg46900292009-02-15 12:44:28 +0100545#endif /* CONFIG_MAC80211_IBSS_DEBUG */
546
547 if (active_ibss)
Johannes Bergaf8cdcd2009-04-19 21:25:43 +0200548 return;
Johannes Berg46900292009-02-15 12:44:28 +0100549
Johannes Berge0d61882009-05-12 20:47:32 +0200550 capability = WLAN_CAPABILITY_IBSS;
Johannes Bergfffd0932009-07-08 14:22:54 +0200551 if (ifibss->privacy)
Johannes Berge0d61882009-05-12 20:47:32 +0200552 capability |= WLAN_CAPABILITY_PRIVACY;
Johannes Bergaf8cdcd2009-04-19 21:25:43 +0200553 if (ifibss->fixed_bssid)
Johannes Berg46900292009-02-15 12:44:28 +0100554 bssid = ifibss->bssid;
Johannes Bergaf8cdcd2009-04-19 21:25:43 +0200555 if (ifibss->fixed_channel)
556 chan = ifibss->channel;
557 if (!is_zero_ether_addr(ifibss->bssid))
558 bssid = ifibss->bssid;
Johannes Berg0c1ad2c2009-12-23 13:15:39 +0100559 cbss = cfg80211_get_bss(local->hw.wiphy, chan, bssid,
560 ifibss->ssid, ifibss->ssid_len,
561 WLAN_CAPABILITY_IBSS | WLAN_CAPABILITY_PRIVACY,
562 capability);
Johannes Berg46900292009-02-15 12:44:28 +0100563
Johannes Berg0c1ad2c2009-12-23 13:15:39 +0100564 if (cbss) {
565 struct ieee80211_bss *bss;
566
567 bss = (void *)cbss->priv;
Johannes Berg46900292009-02-15 12:44:28 +0100568#ifdef CONFIG_MAC80211_IBSS_DEBUG
Johannes Berg46900292009-02-15 12:44:28 +0100569 printk(KERN_DEBUG " sta_find_ibss: selected %pM current "
Johannes Berg0c1ad2c2009-12-23 13:15:39 +0100570 "%pM\n", cbss->bssid, ifibss->bssid);
Johannes Berg46900292009-02-15 12:44:28 +0100571#endif /* CONFIG_MAC80211_IBSS_DEBUG */
572
Johannes Berg46900292009-02-15 12:44:28 +0100573 printk(KERN_DEBUG "%s: Selected IBSS BSSID %pM"
574 " based on configured SSID\n",
Johannes Berg0c1ad2c2009-12-23 13:15:39 +0100575 sdata->name, cbss->bssid);
Johannes Berg46900292009-02-15 12:44:28 +0100576
Johannes Bergaf8cdcd2009-04-19 21:25:43 +0200577 ieee80211_sta_join_ibss(sdata, bss);
Johannes Berg46900292009-02-15 12:44:28 +0100578 ieee80211_rx_bss_put(local, bss);
Johannes Bergaf8cdcd2009-04-19 21:25:43 +0200579 return;
Reinette Chatred419b9f2009-10-19 14:55:37 -0700580 }
Johannes Berg46900292009-02-15 12:44:28 +0100581
582#ifdef CONFIG_MAC80211_IBSS_DEBUG
583 printk(KERN_DEBUG " did not try to join ibss\n");
584#endif /* CONFIG_MAC80211_IBSS_DEBUG */
585
586 /* Selected IBSS not found in current scan results - try to scan */
Benoit Papillaultce9058a2010-01-17 22:45:23 +0100587 if (time_after(jiffies, ifibss->last_scan_completed +
Johannes Berg46900292009-02-15 12:44:28 +0100588 IEEE80211_SCAN_INTERVAL)) {
589 printk(KERN_DEBUG "%s: Trigger new scan to find an IBSS to "
Johannes Berg47846c92009-11-25 17:46:19 +0100590 "join\n", sdata->name);
Johannes Berg46900292009-02-15 12:44:28 +0100591
Johannes Bergf3b85252009-04-23 16:01:47 +0200592 ieee80211_request_internal_scan(sdata, ifibss->ssid,
593 ifibss->ssid_len);
Benoit Papillaultce9058a2010-01-17 22:45:23 +0100594 } else {
Johannes Berg46900292009-02-15 12:44:28 +0100595 int interval = IEEE80211_SCAN_INTERVAL;
596
597 if (time_after(jiffies, ifibss->ibss_join_req +
598 IEEE80211_IBSS_JOIN_TIMEOUT)) {
Johannes Bergaf8cdcd2009-04-19 21:25:43 +0200599 if (!(local->oper_channel->flags & IEEE80211_CHAN_NO_IBSS)) {
600 ieee80211_sta_create_ibss(sdata);
601 return;
602 }
Johannes Berg46900292009-02-15 12:44:28 +0100603 printk(KERN_DEBUG "%s: IBSS not allowed on"
Johannes Berg47846c92009-11-25 17:46:19 +0100604 " %d MHz\n", sdata->name,
Johannes Berg46900292009-02-15 12:44:28 +0100605 local->hw.conf.channel->center_freq);
606
607 /* No IBSS found - decrease scan interval and continue
608 * scanning. */
609 interval = IEEE80211_SCAN_INTERVAL_SLOW;
610 }
611
Johannes Bergaf8cdcd2009-04-19 21:25:43 +0200612 mod_timer(&ifibss->timer,
613 round_jiffies(jiffies + interval));
Johannes Berg46900292009-02-15 12:44:28 +0100614 }
Johannes Berg46900292009-02-15 12:44:28 +0100615}
616
617static void ieee80211_rx_mgmt_probe_req(struct ieee80211_sub_if_data *sdata,
618 struct ieee80211_mgmt *mgmt,
619 size_t len)
620{
621 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
622 struct ieee80211_local *local = sdata->local;
623 int tx_last_beacon;
624 struct sk_buff *skb;
625 struct ieee80211_mgmt *resp;
626 u8 *pos, *end;
627
628 if (ifibss->state != IEEE80211_IBSS_MLME_JOINED ||
Johannes Bergaf8cdcd2009-04-19 21:25:43 +0200629 len < 24 + 2 || !ifibss->presp)
Johannes Berg46900292009-02-15 12:44:28 +0100630 return;
631
Johannes Berg24487982009-04-23 18:52:52 +0200632 tx_last_beacon = drv_tx_last_beacon(local);
Johannes Berg46900292009-02-15 12:44:28 +0100633
634#ifdef CONFIG_MAC80211_IBSS_DEBUG
635 printk(KERN_DEBUG "%s: RX ProbeReq SA=%pM DA=%pM BSSID=%pM"
636 " (tx_last_beacon=%d)\n",
Johannes Berg47846c92009-11-25 17:46:19 +0100637 sdata->name, mgmt->sa, mgmt->da,
Johannes Berg46900292009-02-15 12:44:28 +0100638 mgmt->bssid, tx_last_beacon);
639#endif /* CONFIG_MAC80211_IBSS_DEBUG */
640
641 if (!tx_last_beacon)
642 return;
643
644 if (memcmp(mgmt->bssid, ifibss->bssid, ETH_ALEN) != 0 &&
645 memcmp(mgmt->bssid, "\xff\xff\xff\xff\xff\xff", ETH_ALEN) != 0)
646 return;
647
648 end = ((u8 *) mgmt) + len;
649 pos = mgmt->u.probe_req.variable;
650 if (pos[0] != WLAN_EID_SSID ||
651 pos + 2 + pos[1] > end) {
652#ifdef CONFIG_MAC80211_IBSS_DEBUG
653 printk(KERN_DEBUG "%s: Invalid SSID IE in ProbeReq "
654 "from %pM\n",
Johannes Berg47846c92009-11-25 17:46:19 +0100655 sdata->name, mgmt->sa);
Johannes Berg46900292009-02-15 12:44:28 +0100656#endif
657 return;
658 }
659 if (pos[1] != 0 &&
660 (pos[1] != ifibss->ssid_len ||
Benoit Papillault0da780c2010-02-05 01:21:03 +0100661 memcmp(pos + 2, ifibss->ssid, ifibss->ssid_len))) {
Johannes Berg46900292009-02-15 12:44:28 +0100662 /* Ignore ProbeReq for foreign SSID */
663 return;
664 }
665
666 /* Reply with ProbeResp */
Johannes Bergaf8cdcd2009-04-19 21:25:43 +0200667 skb = skb_copy(ifibss->presp, GFP_KERNEL);
Johannes Berg46900292009-02-15 12:44:28 +0100668 if (!skb)
669 return;
670
671 resp = (struct ieee80211_mgmt *) skb->data;
672 memcpy(resp->da, mgmt->sa, ETH_ALEN);
673#ifdef CONFIG_MAC80211_IBSS_DEBUG
674 printk(KERN_DEBUG "%s: Sending ProbeResp to %pM\n",
Johannes Berg47846c92009-11-25 17:46:19 +0100675 sdata->name, resp->da);
Johannes Berg46900292009-02-15 12:44:28 +0100676#endif /* CONFIG_MAC80211_IBSS_DEBUG */
Johannes Berg62ae67b2009-11-18 18:42:05 +0100677 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
678 ieee80211_tx_skb(sdata, skb);
Johannes Berg46900292009-02-15 12:44:28 +0100679}
680
681static void ieee80211_rx_mgmt_probe_resp(struct ieee80211_sub_if_data *sdata,
682 struct ieee80211_mgmt *mgmt,
683 size_t len,
684 struct ieee80211_rx_status *rx_status)
685{
686 size_t baselen;
687 struct ieee802_11_elems elems;
688
Johannes Berg47846c92009-11-25 17:46:19 +0100689 if (memcmp(mgmt->da, sdata->vif.addr, ETH_ALEN))
Johannes Berg46900292009-02-15 12:44:28 +0100690 return; /* ignore ProbeResp to foreign address */
691
692 baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt;
693 if (baselen > len)
694 return;
695
696 ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen,
697 &elems);
698
699 ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems, false);
700}
701
702static void ieee80211_rx_mgmt_beacon(struct ieee80211_sub_if_data *sdata,
703 struct ieee80211_mgmt *mgmt,
704 size_t len,
705 struct ieee80211_rx_status *rx_status)
706{
707 size_t baselen;
708 struct ieee802_11_elems elems;
709
710 /* Process beacon from the current BSS */
711 baselen = (u8 *) mgmt->u.beacon.variable - (u8 *) mgmt;
712 if (baselen > len)
713 return;
714
715 ieee802_11_parse_elems(mgmt->u.beacon.variable, len - baselen, &elems);
716
717 ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems, true);
718}
719
720static void ieee80211_ibss_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata,
721 struct sk_buff *skb)
722{
723 struct ieee80211_rx_status *rx_status;
724 struct ieee80211_mgmt *mgmt;
725 u16 fc;
726
Johannes Bergf1d58c22009-06-17 13:13:00 +0200727 rx_status = IEEE80211_SKB_RXCB(skb);
Johannes Berg46900292009-02-15 12:44:28 +0100728 mgmt = (struct ieee80211_mgmt *) skb->data;
729 fc = le16_to_cpu(mgmt->frame_control);
730
731 switch (fc & IEEE80211_FCTL_STYPE) {
732 case IEEE80211_STYPE_PROBE_REQ:
733 ieee80211_rx_mgmt_probe_req(sdata, mgmt, skb->len);
734 break;
735 case IEEE80211_STYPE_PROBE_RESP:
736 ieee80211_rx_mgmt_probe_resp(sdata, mgmt, skb->len,
737 rx_status);
738 break;
739 case IEEE80211_STYPE_BEACON:
740 ieee80211_rx_mgmt_beacon(sdata, mgmt, skb->len,
741 rx_status);
742 break;
743 case IEEE80211_STYPE_AUTH:
744 ieee80211_rx_mgmt_auth_ibss(sdata, mgmt, skb->len);
745 break;
746 }
747
748 kfree_skb(skb);
749}
750
751static void ieee80211_ibss_work(struct work_struct *work)
752{
753 struct ieee80211_sub_if_data *sdata =
754 container_of(work, struct ieee80211_sub_if_data, u.ibss.work);
755 struct ieee80211_local *local = sdata->local;
756 struct ieee80211_if_ibss *ifibss;
757 struct sk_buff *skb;
758
Johannes Berg5bb644a2009-05-17 11:40:42 +0200759 if (WARN_ON(local->suspended))
760 return;
761
Johannes Berg9607e6b2009-12-23 13:15:31 +0100762 if (!ieee80211_sdata_running(sdata))
Johannes Berg46900292009-02-15 12:44:28 +0100763 return;
764
Helmut Schaafbe9c422009-07-23 12:14:04 +0200765 if (local->scanning)
Johannes Berg46900292009-02-15 12:44:28 +0100766 return;
767
768 if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_ADHOC))
769 return;
770 ifibss = &sdata->u.ibss;
771
772 while ((skb = skb_dequeue(&ifibss->skb_queue)))
773 ieee80211_ibss_rx_queued_mgmt(sdata, skb);
774
775 if (!test_and_clear_bit(IEEE80211_IBSS_REQ_RUN, &ifibss->request))
776 return;
777
778 switch (ifibss->state) {
779 case IEEE80211_IBSS_MLME_SEARCH:
780 ieee80211_sta_find_ibss(sdata);
781 break;
782 case IEEE80211_IBSS_MLME_JOINED:
783 ieee80211_sta_merge_ibss(sdata);
784 break;
785 default:
786 WARN_ON(1);
787 break;
788 }
789}
790
791static void ieee80211_ibss_timer(unsigned long data)
792{
793 struct ieee80211_sub_if_data *sdata =
794 (struct ieee80211_sub_if_data *) data;
795 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
796 struct ieee80211_local *local = sdata->local;
797
Johannes Berg5bb644a2009-05-17 11:40:42 +0200798 if (local->quiescing) {
799 ifibss->timer_running = true;
800 return;
801 }
802
Johannes Berg46900292009-02-15 12:44:28 +0100803 set_bit(IEEE80211_IBSS_REQ_RUN, &ifibss->request);
Luis R. Rodriguez42935ec2009-07-29 20:08:07 -0400804 ieee80211_queue_work(&local->hw, &ifibss->work);
Johannes Berg46900292009-02-15 12:44:28 +0100805}
806
Johannes Berg5bb644a2009-05-17 11:40:42 +0200807#ifdef CONFIG_PM
808void ieee80211_ibss_quiesce(struct ieee80211_sub_if_data *sdata)
809{
810 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
811
812 cancel_work_sync(&ifibss->work);
813 if (del_timer_sync(&ifibss->timer))
814 ifibss->timer_running = true;
815}
816
817void ieee80211_ibss_restart(struct ieee80211_sub_if_data *sdata)
818{
819 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
820
821 if (ifibss->timer_running) {
822 add_timer(&ifibss->timer);
823 ifibss->timer_running = false;
824 }
825}
826#endif
827
Johannes Berg46900292009-02-15 12:44:28 +0100828void ieee80211_ibss_setup_sdata(struct ieee80211_sub_if_data *sdata)
829{
830 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
831
832 INIT_WORK(&ifibss->work, ieee80211_ibss_work);
833 setup_timer(&ifibss->timer, ieee80211_ibss_timer,
834 (unsigned long) sdata);
835 skb_queue_head_init(&ifibss->skb_queue);
Johannes Berg46900292009-02-15 12:44:28 +0100836}
837
838/* scan finished notification */
839void ieee80211_ibss_notify_scan_completed(struct ieee80211_local *local)
840{
Johannes Bergaf8cdcd2009-04-19 21:25:43 +0200841 struct ieee80211_sub_if_data *sdata;
Johannes Berg46900292009-02-15 12:44:28 +0100842
Johannes Berg29b4a4f2009-04-21 00:30:49 +0200843 mutex_lock(&local->iflist_mtx);
844 list_for_each_entry(sdata, &local->interfaces, list) {
Johannes Berg9607e6b2009-12-23 13:15:31 +0100845 if (!ieee80211_sdata_running(sdata))
Johannes Berg0e41f712009-04-23 11:48:56 +0200846 continue;
Johannes Bergaf8cdcd2009-04-19 21:25:43 +0200847 if (sdata->vif.type != NL80211_IFTYPE_ADHOC)
848 continue;
Johannes Berg0e41f712009-04-23 11:48:56 +0200849 if (!sdata->u.ibss.ssid_len)
850 continue;
Johannes Bergaf8cdcd2009-04-19 21:25:43 +0200851 sdata->u.ibss.last_scan_completed = jiffies;
Johannes Berg51f98f12009-10-11 11:47:57 +0200852 mod_timer(&sdata->u.ibss.timer, 0);
Johannes Berg46900292009-02-15 12:44:28 +0100853 }
Johannes Berg29b4a4f2009-04-21 00:30:49 +0200854 mutex_unlock(&local->iflist_mtx);
Johannes Berg46900292009-02-15 12:44:28 +0100855}
856
857ieee80211_rx_result
Johannes Bergf1d58c22009-06-17 13:13:00 +0200858ieee80211_ibss_rx_mgmt(struct ieee80211_sub_if_data *sdata, struct sk_buff *skb)
Johannes Berg46900292009-02-15 12:44:28 +0100859{
860 struct ieee80211_local *local = sdata->local;
861 struct ieee80211_mgmt *mgmt;
862 u16 fc;
863
864 if (skb->len < 24)
865 return RX_DROP_MONITOR;
866
867 mgmt = (struct ieee80211_mgmt *) skb->data;
868 fc = le16_to_cpu(mgmt->frame_control);
869
870 switch (fc & IEEE80211_FCTL_STYPE) {
871 case IEEE80211_STYPE_PROBE_RESP:
872 case IEEE80211_STYPE_BEACON:
Johannes Berg46900292009-02-15 12:44:28 +0100873 case IEEE80211_STYPE_PROBE_REQ:
874 case IEEE80211_STYPE_AUTH:
875 skb_queue_tail(&sdata->u.ibss.skb_queue, skb);
Luis R. Rodriguez42935ec2009-07-29 20:08:07 -0400876 ieee80211_queue_work(&local->hw, &sdata->u.ibss.work);
Johannes Berg46900292009-02-15 12:44:28 +0100877 return RX_QUEUED;
878 }
879
880 return RX_DROP_MONITOR;
881}
Johannes Bergaf8cdcd2009-04-19 21:25:43 +0200882
883int ieee80211_ibss_join(struct ieee80211_sub_if_data *sdata,
884 struct cfg80211_ibss_params *params)
885{
886 struct sk_buff *skb;
887
Johannes Bergaf8cdcd2009-04-19 21:25:43 +0200888 if (params->bssid) {
889 memcpy(sdata->u.ibss.bssid, params->bssid, ETH_ALEN);
890 sdata->u.ibss.fixed_bssid = true;
891 } else
892 sdata->u.ibss.fixed_bssid = false;
893
Johannes Bergfffd0932009-07-08 14:22:54 +0200894 sdata->u.ibss.privacy = params->privacy;
895
Johannes Berg57c4d7b2009-04-23 16:10:04 +0200896 sdata->vif.bss_conf.beacon_int = params->beacon_interval;
897
Johannes Bergaf8cdcd2009-04-19 21:25:43 +0200898 sdata->u.ibss.channel = params->channel;
899 sdata->u.ibss.fixed_channel = params->channel_fixed;
900
901 if (params->ie) {
902 sdata->u.ibss.ie = kmemdup(params->ie, params->ie_len,
903 GFP_KERNEL);
904 if (sdata->u.ibss.ie)
905 sdata->u.ibss.ie_len = params->ie_len;
906 }
907
908 skb = dev_alloc_skb(sdata->local->hw.extra_tx_headroom +
909 36 /* bitrates */ +
910 34 /* SSID */ +
911 3 /* DS params */ +
912 4 /* IBSS params */ +
913 params->ie_len);
914 if (!skb)
915 return -ENOMEM;
916
917 sdata->u.ibss.skb = skb;
918 sdata->u.ibss.state = IEEE80211_IBSS_MLME_SEARCH;
919 sdata->u.ibss.ibss_join_req = jiffies;
920
Johannes Berg0e41f712009-04-23 11:48:56 +0200921 memcpy(sdata->u.ibss.ssid, params->ssid, IEEE80211_MAX_SSID_LEN);
922
923 /*
924 * The ssid_len setting below is used to see whether
925 * we are active, and we need all other settings
926 * before that may get visible.
927 */
928 mb();
929
930 sdata->u.ibss.ssid_len = params->ssid_len;
931
Johannes Berg5cff20e2009-04-29 12:26:17 +0200932 ieee80211_recalc_idle(sdata->local);
933
Johannes Bergaf8cdcd2009-04-19 21:25:43 +0200934 set_bit(IEEE80211_IBSS_REQ_RUN, &sdata->u.ibss.request);
Luis R. Rodriguez42935ec2009-07-29 20:08:07 -0400935 ieee80211_queue_work(&sdata->local->hw, &sdata->u.ibss.work);
Johannes Bergaf8cdcd2009-04-19 21:25:43 +0200936
937 return 0;
938}
939
940int ieee80211_ibss_leave(struct ieee80211_sub_if_data *sdata)
941{
942 struct sk_buff *skb;
943
944 del_timer_sync(&sdata->u.ibss.timer);
945 clear_bit(IEEE80211_IBSS_REQ_RUN, &sdata->u.ibss.request);
946 cancel_work_sync(&sdata->u.ibss.work);
947 clear_bit(IEEE80211_IBSS_REQ_RUN, &sdata->u.ibss.request);
948
949 sta_info_flush(sdata->local, sdata);
950
951 /* remove beacon */
952 kfree(sdata->u.ibss.ie);
953 skb = sdata->u.ibss.presp;
954 rcu_assign_pointer(sdata->u.ibss.presp, NULL);
Johannes Berg8fc214b2010-04-28 17:40:43 +0200955 sdata->vif.bss_conf.ibss_joined = false;
956 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BEACON_ENABLED |
957 BSS_CHANGED_IBSS);
Johannes Bergaf8cdcd2009-04-19 21:25:43 +0200958 synchronize_rcu();
959 kfree_skb(skb);
960
961 skb_queue_purge(&sdata->u.ibss.skb_queue);
962 memset(sdata->u.ibss.bssid, 0, ETH_ALEN);
Johannes Berg5cff20e2009-04-29 12:26:17 +0200963 sdata->u.ibss.ssid_len = 0;
964
965 ieee80211_recalc_idle(sdata->local);
Johannes Bergaf8cdcd2009-04-19 21:25:43 +0200966
967 return 0;
968}