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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>
Johannes Bergd98ad832014-09-03 15:24:57 +03009 * Copyright 2013-2014 Intel Mobile Communications GmbH
Johannes Berg46900292009-02-15 12:44:28 +010010 *
11 * This program is free software; you can redistribute it and/or modify
12 * it under the terms of the GNU General Public License version 2 as
13 * published by the Free Software Foundation.
14 */
15
16#include <linux/delay.h>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090017#include <linux/slab.h>
Johannes Berg46900292009-02-15 12:44:28 +010018#include <linux/if_ether.h>
19#include <linux/skbuff.h>
20#include <linux/if_arp.h>
21#include <linux/etherdevice.h>
22#include <linux/rtnetlink.h>
23#include <net/mac80211.h>
Johannes Berg46900292009-02-15 12:44:28 +010024
25#include "ieee80211_i.h"
Johannes Berg24487982009-04-23 18:52:52 +020026#include "driver-ops.h"
Johannes Berg46900292009-02-15 12:44:28 +010027#include "rate.h"
28
29#define IEEE80211_SCAN_INTERVAL (2 * HZ)
Johannes Berg46900292009-02-15 12:44:28 +010030#define IEEE80211_IBSS_JOIN_TIMEOUT (7 * HZ)
31
32#define IEEE80211_IBSS_MERGE_INTERVAL (30 * HZ)
33#define IEEE80211_IBSS_INACTIVITY_LIMIT (60 * HZ)
Antonio Quartullidad9def2013-07-26 21:15:02 +020034#define IEEE80211_IBSS_RSN_INACTIVITY_LIMIT (10 * HZ)
Johannes Berg46900292009-02-15 12:44:28 +010035
36#define IEEE80211_IBSS_MAX_STA_ENTRIES 128
37
Simon Wunderlichd51b70f2013-08-09 16:35:17 +020038static struct beacon_data *
39ieee80211_ibss_build_presp(struct ieee80211_sub_if_data *sdata,
40 const int beacon_int, const u32 basic_rates,
41 const u16 capability, u64 tsf,
42 struct cfg80211_chan_def *chandef,
Simon Wunderlichcd7760e2013-08-28 13:41:31 +020043 bool *have_higher_than_11mbit,
44 struct cfg80211_csa_settings *csa_settings)
Simon Wunderlichd51b70f2013-08-09 16:35:17 +020045{
46 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
47 struct ieee80211_local *local = sdata->local;
48 int rates_n = 0, i, ri;
49 struct ieee80211_mgmt *mgmt;
50 u8 *pos;
51 struct ieee80211_supported_band *sband;
52 u32 rate_flags, rates = 0, rates_added = 0;
53 struct beacon_data *presp;
54 int frame_len;
55 int shift;
56
57 /* Build IBSS probe response */
58 frame_len = sizeof(struct ieee80211_hdr_3addr) +
59 12 /* struct ieee80211_mgmt.u.beacon */ +
60 2 + IEEE80211_MAX_SSID_LEN /* max SSID */ +
61 2 + 8 /* max Supported Rates */ +
62 3 /* max DS params */ +
63 4 /* IBSS params */ +
Simon Wunderlichcd7760e2013-08-28 13:41:31 +020064 5 /* Channel Switch Announcement */ +
Simon Wunderlichd51b70f2013-08-09 16:35:17 +020065 2 + (IEEE80211_MAX_SUPP_RATES - 8) +
66 2 + sizeof(struct ieee80211_ht_cap) +
67 2 + sizeof(struct ieee80211_ht_operation) +
68 ifibss->ie_len;
69 presp = kzalloc(sizeof(*presp) + frame_len, GFP_KERNEL);
70 if (!presp)
71 return NULL;
72
73 presp->head = (void *)(presp + 1);
74
75 mgmt = (void *) presp->head;
76 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
77 IEEE80211_STYPE_PROBE_RESP);
78 eth_broadcast_addr(mgmt->da);
79 memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
80 memcpy(mgmt->bssid, ifibss->bssid, ETH_ALEN);
81 mgmt->u.beacon.beacon_int = cpu_to_le16(beacon_int);
82 mgmt->u.beacon.timestamp = cpu_to_le64(tsf);
83 mgmt->u.beacon.capab_info = cpu_to_le16(capability);
84
85 pos = (u8 *)mgmt + offsetof(struct ieee80211_mgmt, u.beacon.variable);
86
87 *pos++ = WLAN_EID_SSID;
88 *pos++ = ifibss->ssid_len;
89 memcpy(pos, ifibss->ssid, ifibss->ssid_len);
90 pos += ifibss->ssid_len;
91
92 sband = local->hw.wiphy->bands[chandef->chan->band];
93 rate_flags = ieee80211_chandef_rate_flags(chandef);
94 shift = ieee80211_chandef_get_shift(chandef);
95 rates_n = 0;
96 if (have_higher_than_11mbit)
97 *have_higher_than_11mbit = false;
98
99 for (i = 0; i < sband->n_bitrates; i++) {
100 if ((rate_flags & sband->bitrates[i].flags) != rate_flags)
101 continue;
102 if (sband->bitrates[i].bitrate > 110 &&
103 have_higher_than_11mbit)
104 *have_higher_than_11mbit = true;
105
106 rates |= BIT(i);
107 rates_n++;
108 }
109
110 *pos++ = WLAN_EID_SUPP_RATES;
111 *pos++ = min_t(int, 8, rates_n);
112 for (ri = 0; ri < sband->n_bitrates; ri++) {
113 int rate = DIV_ROUND_UP(sband->bitrates[ri].bitrate,
114 5 * (1 << shift));
115 u8 basic = 0;
116 if (!(rates & BIT(ri)))
117 continue;
118
119 if (basic_rates & BIT(ri))
120 basic = 0x80;
121 *pos++ = basic | (u8) rate;
122 if (++rates_added == 8) {
123 ri++; /* continue at next rate for EXT_SUPP_RATES */
124 break;
125 }
126 }
127
128 if (sband->band == IEEE80211_BAND_2GHZ) {
129 *pos++ = WLAN_EID_DS_PARAMS;
130 *pos++ = 1;
131 *pos++ = ieee80211_frequency_to_channel(
132 chandef->chan->center_freq);
133 }
134
135 *pos++ = WLAN_EID_IBSS_PARAMS;
136 *pos++ = 2;
137 /* FIX: set ATIM window based on scan results */
138 *pos++ = 0;
139 *pos++ = 0;
140
Simon Wunderlichcd7760e2013-08-28 13:41:31 +0200141 if (csa_settings) {
142 *pos++ = WLAN_EID_CHANNEL_SWITCH;
143 *pos++ = 3;
144 *pos++ = csa_settings->block_tx ? 1 : 0;
145 *pos++ = ieee80211_frequency_to_channel(
146 csa_settings->chandef.chan->center_freq);
Michal Kazioraf296bd2014-06-05 14:21:36 +0200147 presp->csa_counter_offsets[0] = (pos - presp->head);
Simon Wunderlichcd7760e2013-08-28 13:41:31 +0200148 *pos++ = csa_settings->count;
149 }
150
Simon Wunderlichd51b70f2013-08-09 16:35:17 +0200151 /* put the remaining rates in WLAN_EID_EXT_SUPP_RATES */
152 if (rates_n > 8) {
153 *pos++ = WLAN_EID_EXT_SUPP_RATES;
154 *pos++ = rates_n - 8;
155 for (; ri < sband->n_bitrates; ri++) {
156 int rate = DIV_ROUND_UP(sband->bitrates[ri].bitrate,
157 5 * (1 << shift));
158 u8 basic = 0;
159 if (!(rates & BIT(ri)))
160 continue;
161
162 if (basic_rates & BIT(ri))
163 basic = 0x80;
164 *pos++ = basic | (u8) rate;
165 }
166 }
167
168 if (ifibss->ie_len) {
169 memcpy(pos, ifibss->ie, ifibss->ie_len);
170 pos += ifibss->ie_len;
171 }
172
173 /* add HT capability and information IEs */
174 if (chandef->width != NL80211_CHAN_WIDTH_20_NOHT &&
175 chandef->width != NL80211_CHAN_WIDTH_5 &&
176 chandef->width != NL80211_CHAN_WIDTH_10 &&
177 sband->ht_cap.ht_supported) {
178 struct ieee80211_sta_ht_cap ht_cap;
179
180 memcpy(&ht_cap, &sband->ht_cap, sizeof(ht_cap));
181 ieee80211_apply_htcap_overrides(sdata, &ht_cap);
182
183 pos = ieee80211_ie_build_ht_cap(pos, &ht_cap, ht_cap.cap);
184 /*
185 * Note: According to 802.11n-2009 9.13.3.1, HT Protection
186 * field and RIFS Mode are reserved in IBSS mode, therefore
187 * keep them at 0
188 */
189 pos = ieee80211_ie_build_ht_oper(pos, &sband->ht_cap,
190 chandef, 0);
191 }
192
Arik Nemtsov40b861a2014-07-17 17:14:23 +0300193 if (local->hw.queues >= IEEE80211_NUM_ACS)
194 pos = ieee80211_add_wmm_info_ie(pos, 0); /* U-APSD not in use */
Simon Wunderlichd51b70f2013-08-09 16:35:17 +0200195
196 presp->head_len = pos - presp->head;
197 if (WARN_ON(presp->head_len > frame_len))
198 goto error;
199
200 return presp;
201error:
202 kfree(presp);
203 return NULL;
204}
Johannes Berg46900292009-02-15 12:44:28 +0100205
Johannes Bergaf8cdcd2009-04-19 21:25:43 +0200206static void __ieee80211_sta_join_ibss(struct ieee80211_sub_if_data *sdata,
207 const u8 *bssid, const int beacon_int,
Simon Wunderlich75a423f2013-08-21 15:30:25 +0200208 struct cfg80211_chan_def *req_chandef,
Johannes Bergb59066a2009-05-12 21:18:38 +0200209 const u32 basic_rates,
Sujith Manoharanc13a7652012-10-12 17:35:45 +0530210 const u16 capability, u64 tsf,
211 bool creator)
Johannes Berg46900292009-02-15 12:44:28 +0100212{
213 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
214 struct ieee80211_local *local = sdata->local;
Simon Wunderlichd51b70f2013-08-09 16:35:17 +0200215 struct ieee80211_mgmt *mgmt;
Johannes Bergf446d102009-10-28 15:12:32 +0100216 struct cfg80211_bss *bss;
Simon Wunderlichd51b70f2013-08-09 16:35:17 +0200217 u32 bss_change;
Johannes Berg683b6d32012-11-08 21:25:48 +0100218 struct cfg80211_chan_def chandef;
Simon Wunderlich75a423f2013-08-21 15:30:25 +0200219 struct ieee80211_channel *chan;
Johannes Bergc3ffeab2013-03-07 20:54:29 +0100220 struct beacon_data *presp;
Simon Wunderlichd51b70f2013-08-09 16:35:17 +0200221 enum nl80211_bss_scan_width scan_width;
222 bool have_higher_than_11mbit;
Luciano Coelho2beb6dab2014-02-18 11:40:36 +0200223 bool radar_required;
Johannes Berg55fff502013-08-19 18:48:41 +0200224 int err;
Johannes Berg24487982009-04-23 18:52:52 +0200225
Johannes Berg8d61ffa2013-05-10 12:32:47 +0200226 sdata_assert_lock(sdata);
Johannes Berg7a17a332010-07-21 11:30:27 +0200227
Johannes Berg24487982009-04-23 18:52:52 +0200228 /* Reset own TSF to allow time synchronization work. */
Eliad Peller37a41b42011-09-21 14:06:11 +0300229 drv_reset_tsf(local, sdata);
Johannes Berg46900292009-02-15 12:44:28 +0100230
Joe Perchesb203ca32012-05-08 18:56:52 +0000231 if (!ether_addr_equal(ifibss->bssid, bssid))
Johannes Bergb998e8b2012-12-13 23:07:46 +0100232 sta_info_flush(sdata);
Johannes Berg46900292009-02-15 12:44:28 +0100233
Johannes Berg49b5c7f2010-04-29 21:34:01 +0200234 /* if merging, indicate to driver that we leave the old IBSS */
235 if (sdata->vif.bss_conf.ibss_joined) {
236 sdata->vif.bss_conf.ibss_joined = false;
Sujith Manoharanc13a7652012-10-12 17:35:45 +0530237 sdata->vif.bss_conf.ibss_creator = false;
Johannes Berg1852d402013-03-07 20:22:28 +0100238 sdata->vif.bss_conf.enable_beacon = false;
Eliad Peller86a2ea42011-11-08 15:36:59 +0200239 netif_carrier_off(sdata->dev);
Johannes Berg1852d402013-03-07 20:22:28 +0100240 ieee80211_bss_info_change_notify(sdata,
241 BSS_CHANGED_IBSS |
242 BSS_CHANGED_BEACON_ENABLED);
Johannes Berg55fff502013-08-19 18:48:41 +0200243 drv_leave_ibss(local, sdata);
Johannes Berg49b5c7f2010-04-29 21:34:01 +0200244 }
245
Johannes Bergc3ffeab2013-03-07 20:54:29 +0100246 presp = rcu_dereference_protected(ifibss->presp,
Johannes Berg8d61ffa2013-05-10 12:32:47 +0200247 lockdep_is_held(&sdata->wdev.mtx));
Monam Agarwal0c2bef462014-03-24 00:51:43 +0530248 RCU_INIT_POINTER(ifibss->presp, NULL);
Johannes Bergc3ffeab2013-03-07 20:54:29 +0100249 if (presp)
250 kfree_rcu(presp, rcu_head);
Johannes Berg1852d402013-03-07 20:22:28 +0100251
Johannes Bergaf8cdcd2009-04-19 21:25:43 +0200252 sdata->drop_unencrypted = capability & WLAN_CAPABILITY_PRIVACY ? 1 : 0;
Johannes Berg46900292009-02-15 12:44:28 +0100253
Simon Wunderlich75a423f2013-08-21 15:30:25 +0200254 /* make a copy of the chandef, it could be modified below. */
255 chandef = *req_chandef;
256 chan = chandef.chan;
Ilan Peer174e0cd2014-02-23 09:13:01 +0200257 if (!cfg80211_reg_can_beacon(local->hw.wiphy, &chandef,
258 NL80211_IFTYPE_ADHOC)) {
Simon Wunderlich4b42aab2013-07-08 16:55:57 +0200259 if (chandef.width == NL80211_CHAN_WIDTH_5 ||
260 chandef.width == NL80211_CHAN_WIDTH_10 ||
261 chandef.width == NL80211_CHAN_WIDTH_20_NOHT ||
262 chandef.width == NL80211_CHAN_WIDTH_20) {
263 sdata_info(sdata,
264 "Failed to join IBSS, beacons forbidden\n");
265 return;
266 }
Johannes Berg4bf88532012-11-09 11:39:59 +0100267 chandef.width = NL80211_CHAN_WIDTH_20;
268 chandef.center_freq1 = chan->center_freq;
Simon Wunderlich8e8d3472013-10-07 18:41:06 +0200269 /* check again for downgraded chandef */
Ilan Peer174e0cd2014-02-23 09:13:01 +0200270 if (!cfg80211_reg_can_beacon(local->hw.wiphy, &chandef,
271 NL80211_IFTYPE_ADHOC)) {
Simon Wunderlich8e8d3472013-10-07 18:41:06 +0200272 sdata_info(sdata,
273 "Failed to join IBSS, beacons forbidden\n");
274 return;
275 }
276 }
277
278 err = cfg80211_chandef_dfs_required(sdata->local->hw.wiphy,
Luciano Coelho2beb6dab2014-02-18 11:40:36 +0200279 &chandef, NL80211_IFTYPE_ADHOC);
Luciano Coelho6658ab82014-02-20 16:36:23 +0200280 if (err < 0) {
281 sdata_info(sdata,
282 "Failed to join IBSS, invalid chandef\n");
283 return;
284 }
Luciano Coelho2beb6dab2014-02-18 11:40:36 +0200285 if (err > 0 && !ifibss->userspace_handles_dfs) {
286 sdata_info(sdata,
287 "Failed to join IBSS, DFS channel without control program\n");
288 return;
Johannes Berg4bf88532012-11-09 11:39:59 +0100289 }
Johannes Berg55de9082012-07-26 17:24:39 +0200290
Luciano Coelho2beb6dab2014-02-18 11:40:36 +0200291 radar_required = err;
292
Johannes Berg34a37402013-12-18 09:43:33 +0100293 mutex_lock(&local->mtx);
Johannes Berg4bf88532012-11-09 11:39:59 +0100294 if (ieee80211_vif_use_channel(sdata, &chandef,
Johannes Berg55de9082012-07-26 17:24:39 +0200295 ifibss->fixed_channel ?
296 IEEE80211_CHANCTX_SHARED :
297 IEEE80211_CHANCTX_EXCLUSIVE)) {
298 sdata_info(sdata, "Failed to join IBSS, no channel context\n");
Johannes Berg34a37402013-12-18 09:43:33 +0100299 mutex_unlock(&local->mtx);
Johannes Berg55de9082012-07-26 17:24:39 +0200300 return;
Alexander Simon13c40c52011-11-30 16:56:34 +0100301 }
Michal Kaziorcc901de2014-01-29 07:56:20 +0100302 sdata->radar_required = radar_required;
Johannes Berg34a37402013-12-18 09:43:33 +0100303 mutex_unlock(&local->mtx);
Johannes Berg55de9082012-07-26 17:24:39 +0200304
305 memcpy(ifibss->bssid, bssid, ETH_ALEN);
Johannes Berg57c4d7b2009-04-23 16:10:04 +0200306
Simon Wunderlichd51b70f2013-08-09 16:35:17 +0200307 presp = ieee80211_ibss_build_presp(sdata, beacon_int, basic_rates,
308 capability, tsf, &chandef,
Simon Wunderlichcd7760e2013-08-28 13:41:31 +0200309 &have_higher_than_11mbit, NULL);
Johannes Bergc3ffeab2013-03-07 20:54:29 +0100310 if (!presp)
311 return;
312
Johannes Bergc3ffeab2013-03-07 20:54:29 +0100313 rcu_assign_pointer(ifibss->presp, presp);
Simon Wunderlichd51b70f2013-08-09 16:35:17 +0200314 mgmt = (void *)presp->head;
Johannes Berg46900292009-02-15 12:44:28 +0100315
Johannes Bergd6a83222012-12-14 14:06:28 +0100316 sdata->vif.bss_conf.enable_beacon = true;
Johannes Berg2d0ddec2009-04-23 16:13:26 +0200317 sdata->vif.bss_conf.beacon_int = beacon_int;
Teemu Paasikivifbd2c8d2010-06-14 12:55:31 +0300318 sdata->vif.bss_conf.basic_rates = basic_rates;
Marek Puzyniak0ca54f62013-04-10 13:19:13 +0200319 sdata->vif.bss_conf.ssid_len = ifibss->ssid_len;
320 memcpy(sdata->vif.bss_conf.ssid, ifibss->ssid, ifibss->ssid_len);
Johannes Berg2d0ddec2009-04-23 16:13:26 +0200321 bss_change = BSS_CHANGED_BEACON_INT;
322 bss_change |= ieee80211_reset_erp_info(sdata);
323 bss_change |= BSS_CHANGED_BSSID;
324 bss_change |= BSS_CHANGED_BEACON;
325 bss_change |= BSS_CHANGED_BEACON_ENABLED;
Teemu Paasikivi392cfdb2010-06-14 12:55:32 +0300326 bss_change |= BSS_CHANGED_BASIC_RATES;
Alexander Simon13c40c52011-11-30 16:56:34 +0100327 bss_change |= BSS_CHANGED_HT;
Johannes Berg8fc214b2010-04-28 17:40:43 +0200328 bss_change |= BSS_CHANGED_IBSS;
Marek Puzyniak0ca54f62013-04-10 13:19:13 +0200329 bss_change |= BSS_CHANGED_SSID;
Simon Wunderlich2f91a962012-12-03 22:21:30 +0100330
331 /*
332 * In 5 GHz/802.11a, we can always use short slot time.
333 * (IEEE 802.11-2012 18.3.8.7)
334 *
335 * In 2.4GHz, we must always use long slots in IBSS for compatibility
336 * reasons.
337 * (IEEE 802.11-2012 19.4.5)
338 *
339 * HT follows these specifications (IEEE 802.11-2012 20.3.18)
340 */
341 sdata->vif.bss_conf.use_short_slot = chan->band == IEEE80211_BAND_5GHZ;
342 bss_change |= BSS_CHANGED_ERP_SLOT;
343
Simon Wunderlich2ec9c1f2013-07-11 18:07:46 +0200344 /* cf. IEEE 802.11 9.2.12 */
345 if (chan->band == IEEE80211_BAND_2GHZ && have_higher_than_11mbit)
346 sdata->flags |= IEEE80211_SDATA_OPERATING_GMODE;
347 else
348 sdata->flags &= ~IEEE80211_SDATA_OPERATING_GMODE;
349
Johannes Berg55fff502013-08-19 18:48:41 +0200350 ieee80211_set_wmm_default(sdata, true);
351
Johannes Berg8fc214b2010-04-28 17:40:43 +0200352 sdata->vif.bss_conf.ibss_joined = true;
Sujith Manoharanc13a7652012-10-12 17:35:45 +0530353 sdata->vif.bss_conf.ibss_creator = creator;
Johannes Berg46900292009-02-15 12:44:28 +0100354
Johannes Berg55fff502013-08-19 18:48:41 +0200355 err = drv_join_ibss(local, sdata);
356 if (err) {
357 sdata->vif.bss_conf.ibss_joined = false;
358 sdata->vif.bss_conf.ibss_creator = false;
359 sdata->vif.bss_conf.enable_beacon = false;
360 sdata->vif.bss_conf.ssid_len = 0;
361 RCU_INIT_POINTER(ifibss->presp, NULL);
362 kfree_rcu(presp, rcu_head);
Johannes Berg34a37402013-12-18 09:43:33 +0100363 mutex_lock(&local->mtx);
Johannes Berg55fff502013-08-19 18:48:41 +0200364 ieee80211_vif_release_channel(sdata);
Johannes Berg34a37402013-12-18 09:43:33 +0100365 mutex_unlock(&local->mtx);
Johannes Berg55fff502013-08-19 18:48:41 +0200366 sdata_info(sdata, "Failed to join IBSS, driver failure: %d\n",
367 err);
368 return;
369 }
370
371 ieee80211_bss_info_change_notify(sdata, bss_change);
Johannes Berg46900292009-02-15 12:44:28 +0100372
Johannes Berg46900292009-02-15 12:44:28 +0100373 ifibss->state = IEEE80211_IBSS_MLME_JOINED;
Johannes Bergaf8cdcd2009-04-19 21:25:43 +0200374 mod_timer(&ifibss->timer,
375 round_jiffies(jiffies + IEEE80211_IBSS_MERGE_INTERVAL));
Johannes Berg46900292009-02-15 12:44:28 +0100376
Simon Wunderlich7ca15a02013-07-08 16:55:56 +0200377 scan_width = cfg80211_chandef_to_scan_width(&chandef);
378 bss = cfg80211_inform_bss_width_frame(local->hw.wiphy, chan,
379 scan_width, mgmt,
380 presp->head_len, 0, GFP_KERNEL);
Johannes Berg5b112d32013-02-01 01:49:58 +0100381 cfg80211_put_bss(local->hw.wiphy, bss);
Eliad Peller86a2ea42011-11-08 15:36:59 +0200382 netif_carrier_on(sdata->dev);
Antonio Quartullife94f3a2014-01-29 17:53:43 +0100383 cfg80211_ibss_joined(sdata->dev, ifibss->bssid, chan, GFP_KERNEL);
Johannes Berg46900292009-02-15 12:44:28 +0100384}
385
Johannes Bergaf8cdcd2009-04-19 21:25:43 +0200386static void ieee80211_sta_join_ibss(struct ieee80211_sub_if_data *sdata,
387 struct ieee80211_bss *bss)
Johannes Berg46900292009-02-15 12:44:28 +0100388{
Johannes Berg0c1ad2c2009-12-23 13:15:39 +0100389 struct cfg80211_bss *cbss =
390 container_of((void *)bss, struct cfg80211_bss, priv);
Johannes Bergb59066a2009-05-12 21:18:38 +0200391 struct ieee80211_supported_band *sband;
Simon Wunderlich75a423f2013-08-21 15:30:25 +0200392 struct cfg80211_chan_def chandef;
Johannes Bergb59066a2009-05-12 21:18:38 +0200393 u32 basic_rates;
394 int i, j;
Johannes Berg0c1ad2c2009-12-23 13:15:39 +0100395 u16 beacon_int = cbss->beacon_interval;
Johannes Berg8cef2c92013-02-05 16:54:31 +0100396 const struct cfg80211_bss_ies *ies;
Simon Wunderlich75a423f2013-08-21 15:30:25 +0200397 enum nl80211_channel_type chan_type;
Johannes Berg8cef2c92013-02-05 16:54:31 +0100398 u64 tsf;
Simon Wunderlich2103dec2013-07-08 16:55:53 +0200399 u32 rate_flags;
400 int shift;
Johannes Berg57c4d7b2009-04-23 16:10:04 +0200401
Johannes Berg8d61ffa2013-05-10 12:32:47 +0200402 sdata_assert_lock(sdata);
Johannes Berg7a17a332010-07-21 11:30:27 +0200403
Johannes Berg57c4d7b2009-04-23 16:10:04 +0200404 if (beacon_int < 10)
405 beacon_int = 10;
406
Simon Wunderlich75a423f2013-08-21 15:30:25 +0200407 switch (sdata->u.ibss.chandef.width) {
408 case NL80211_CHAN_WIDTH_20_NOHT:
409 case NL80211_CHAN_WIDTH_20:
410 case NL80211_CHAN_WIDTH_40:
411 chan_type = cfg80211_get_chandef_type(&sdata->u.ibss.chandef);
412 cfg80211_chandef_create(&chandef, cbss->channel, chan_type);
413 break;
414 case NL80211_CHAN_WIDTH_5:
415 case NL80211_CHAN_WIDTH_10:
416 cfg80211_chandef_create(&chandef, cbss->channel,
417 NL80211_CHAN_WIDTH_20_NOHT);
418 chandef.width = sdata->u.ibss.chandef.width;
419 break;
420 default:
421 /* fall back to 20 MHz for unsupported modes */
422 cfg80211_chandef_create(&chandef, cbss->channel,
423 NL80211_CHAN_WIDTH_20_NOHT);
424 break;
425 }
426
Johannes Berg0c1ad2c2009-12-23 13:15:39 +0100427 sband = sdata->local->hw.wiphy->bands[cbss->channel->band];
Simon Wunderlich2103dec2013-07-08 16:55:53 +0200428 rate_flags = ieee80211_chandef_rate_flags(&sdata->u.ibss.chandef);
429 shift = ieee80211_vif_get_shift(&sdata->vif);
Johannes Bergb59066a2009-05-12 21:18:38 +0200430
431 basic_rates = 0;
432
433 for (i = 0; i < bss->supp_rates_len; i++) {
Simon Wunderlich2103dec2013-07-08 16:55:53 +0200434 int rate = bss->supp_rates[i] & 0x7f;
Johannes Bergb59066a2009-05-12 21:18:38 +0200435 bool is_basic = !!(bss->supp_rates[i] & 0x80);
436
437 for (j = 0; j < sband->n_bitrates; j++) {
Simon Wunderlich2103dec2013-07-08 16:55:53 +0200438 int brate;
439 if ((rate_flags & sband->bitrates[j].flags)
440 != rate_flags)
441 continue;
442
443 brate = DIV_ROUND_UP(sband->bitrates[j].bitrate,
444 5 * (1 << shift));
445 if (brate == rate) {
Johannes Bergb59066a2009-05-12 21:18:38 +0200446 if (is_basic)
447 basic_rates |= BIT(j);
448 break;
449 }
450 }
451 }
452
Johannes Berg8cef2c92013-02-05 16:54:31 +0100453 rcu_read_lock();
454 ies = rcu_dereference(cbss->ies);
455 tsf = ies->tsf;
456 rcu_read_unlock();
457
Johannes Berg0c1ad2c2009-12-23 13:15:39 +0100458 __ieee80211_sta_join_ibss(sdata, cbss->bssid,
Johannes Berg57c4d7b2009-04-23 16:10:04 +0200459 beacon_int,
Simon Wunderlich75a423f2013-08-21 15:30:25 +0200460 &chandef,
Johannes Bergb59066a2009-05-12 21:18:38 +0200461 basic_rates,
Johannes Berg0c1ad2c2009-12-23 13:15:39 +0100462 cbss->capability,
Johannes Berg8cef2c92013-02-05 16:54:31 +0100463 tsf, false);
Johannes Berg46900292009-02-15 12:44:28 +0100464}
465
Simon Wunderlichcd7760e2013-08-28 13:41:31 +0200466int ieee80211_ibss_csa_beacon(struct ieee80211_sub_if_data *sdata,
467 struct cfg80211_csa_settings *csa_settings)
468{
469 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
470 struct beacon_data *presp, *old_presp;
471 struct cfg80211_bss *cbss;
472 const struct cfg80211_bss_ies *ies;
473 u16 capability;
474 u64 tsf;
475 int ret = 0;
476
477 sdata_assert_lock(sdata);
478
479 capability = WLAN_CAPABILITY_IBSS;
480
481 if (ifibss->privacy)
482 capability |= WLAN_CAPABILITY_PRIVACY;
483
484 cbss = cfg80211_get_bss(sdata->local->hw.wiphy, ifibss->chandef.chan,
485 ifibss->bssid, ifibss->ssid,
486 ifibss->ssid_len, WLAN_CAPABILITY_IBSS |
487 WLAN_CAPABILITY_PRIVACY,
488 capability);
489
490 if (WARN_ON(!cbss)) {
491 ret = -EINVAL;
492 goto out;
493 }
494
495 rcu_read_lock();
496 ies = rcu_dereference(cbss->ies);
497 tsf = ies->tsf;
498 rcu_read_unlock();
499 cfg80211_put_bss(sdata->local->hw.wiphy, cbss);
500
501 old_presp = rcu_dereference_protected(ifibss->presp,
502 lockdep_is_held(&sdata->wdev.mtx));
503
504 presp = ieee80211_ibss_build_presp(sdata,
505 sdata->vif.bss_conf.beacon_int,
506 sdata->vif.bss_conf.basic_rates,
507 capability, tsf, &ifibss->chandef,
508 NULL, csa_settings);
509 if (!presp) {
510 ret = -ENOMEM;
511 goto out;
512 }
513
514 rcu_assign_pointer(ifibss->presp, presp);
515 if (old_presp)
516 kfree_rcu(old_presp, rcu_head);
517
Luciano Coelhodddd5862013-12-13 21:13:51 +0200518 return BSS_CHANGED_BEACON;
Simon Wunderlichcd7760e2013-08-28 13:41:31 +0200519 out:
520 return ret;
521}
522
523int ieee80211_ibss_finish_csa(struct ieee80211_sub_if_data *sdata)
524{
525 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
526 struct cfg80211_bss *cbss;
Michal Kaziorfaf046e2014-01-29 07:56:17 +0100527 int err, changed = 0;
Simon Wunderlichcd7760e2013-08-28 13:41:31 +0200528 u16 capability;
529
Simon Wunderlichbafdc612013-12-05 19:54:43 +0100530 sdata_assert_lock(sdata);
531
Simon Wunderlichcd7760e2013-08-28 13:41:31 +0200532 /* update cfg80211 bss information with the new channel */
533 if (!is_zero_ether_addr(ifibss->bssid)) {
534 capability = WLAN_CAPABILITY_IBSS;
535
536 if (ifibss->privacy)
537 capability |= WLAN_CAPABILITY_PRIVACY;
538
539 cbss = cfg80211_get_bss(sdata->local->hw.wiphy,
540 ifibss->chandef.chan,
541 ifibss->bssid, ifibss->ssid,
542 ifibss->ssid_len, WLAN_CAPABILITY_IBSS |
543 WLAN_CAPABILITY_PRIVACY,
544 capability);
545 /* XXX: should not really modify cfg80211 data */
546 if (cbss) {
Luciano Coelho33787fc2013-11-11 20:34:54 +0200547 cbss->channel = sdata->csa_chandef.chan;
Simon Wunderlichcd7760e2013-08-28 13:41:31 +0200548 cfg80211_put_bss(sdata->local->hw.wiphy, cbss);
549 }
550 }
551
Luciano Coelho33787fc2013-11-11 20:34:54 +0200552 ifibss->chandef = sdata->csa_chandef;
Simon Wunderlichcd7760e2013-08-28 13:41:31 +0200553
554 /* generate the beacon */
555 err = ieee80211_ibss_csa_beacon(sdata, NULL);
Simon Wunderlichcd7760e2013-08-28 13:41:31 +0200556 if (err < 0)
557 return err;
558
Michal Kaziorfaf046e2014-01-29 07:56:17 +0100559 changed |= err;
Luciano Coelhodddd5862013-12-13 21:13:51 +0200560
Michal Kaziorfaf046e2014-01-29 07:56:17 +0100561 return changed;
Simon Wunderlichcd7760e2013-08-28 13:41:31 +0200562}
563
564void ieee80211_ibss_stop(struct ieee80211_sub_if_data *sdata)
565{
566 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
567
568 cancel_work_sync(&ifibss->csa_connection_drop_work);
569}
570
Antonio Quartulli52874a52013-06-18 14:20:40 +0200571static struct sta_info *ieee80211_ibss_finish_sta(struct sta_info *sta)
Johannes Berg8bf11d82011-12-15 11:17:37 +0100572 __acquires(RCU)
573{
574 struct ieee80211_sub_if_data *sdata = sta->sdata;
575 u8 addr[ETH_ALEN];
576
577 memcpy(addr, sta->sta.addr, ETH_ALEN);
578
Johannes Bergbdcbd8e2012-06-22 11:29:50 +0200579 ibss_dbg(sdata, "Adding new IBSS station %pM\n", addr);
Johannes Berg8bf11d82011-12-15 11:17:37 +0100580
Johannes Berg83d5cc02012-01-12 09:31:10 +0100581 sta_info_pre_move_state(sta, IEEE80211_STA_AUTH);
582 sta_info_pre_move_state(sta, IEEE80211_STA_ASSOC);
Antonio Quartulli267335d2012-01-31 20:25:47 +0100583 /* authorize the station only if the network is not RSN protected. If
584 * not wait for the userspace to authorize it */
585 if (!sta->sdata->u.ibss.control_port)
586 sta_info_pre_move_state(sta, IEEE80211_STA_AUTHORIZED);
Johannes Berg8bf11d82011-12-15 11:17:37 +0100587
588 rate_control_rate_init(sta);
589
590 /* If it fails, maybe we raced another insertion? */
591 if (sta_info_insert_rcu(sta))
592 return sta_info_get(sdata, addr);
593 return sta;
594}
595
596static struct sta_info *
Antonio Quartulli52874a52013-06-18 14:20:40 +0200597ieee80211_ibss_add_sta(struct ieee80211_sub_if_data *sdata, const u8 *bssid,
598 const u8 *addr, u32 supp_rates)
Johannes Berg8bf11d82011-12-15 11:17:37 +0100599 __acquires(RCU)
600{
601 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
602 struct ieee80211_local *local = sdata->local;
603 struct sta_info *sta;
Johannes Berg55de9082012-07-26 17:24:39 +0200604 struct ieee80211_chanctx_conf *chanctx_conf;
Ashok Nagarajanb422c6c2013-05-10 17:50:51 -0700605 struct ieee80211_supported_band *sband;
Simon Wunderlich74608ac2013-07-08 16:55:54 +0200606 enum nl80211_bss_scan_width scan_width;
Johannes Berg55de9082012-07-26 17:24:39 +0200607 int band;
Johannes Berg8bf11d82011-12-15 11:17:37 +0100608
609 /*
610 * XXX: Consider removing the least recently used entry and
611 * allow new one to be added.
612 */
613 if (local->num_sta >= IEEE80211_IBSS_MAX_STA_ENTRIES) {
Johannes Bergbdcbd8e2012-06-22 11:29:50 +0200614 net_info_ratelimited("%s: No room for a new IBSS STA entry %pM\n",
Joe Perchese87cc472012-05-13 21:56:26 +0000615 sdata->name, addr);
Johannes Berg8bf11d82011-12-15 11:17:37 +0100616 rcu_read_lock();
617 return NULL;
618 }
619
620 if (ifibss->state == IEEE80211_IBSS_MLME_SEARCH) {
621 rcu_read_lock();
622 return NULL;
623 }
624
Joe Perchesb203ca32012-05-08 18:56:52 +0000625 if (!ether_addr_equal(bssid, sdata->u.ibss.bssid)) {
Johannes Berg8bf11d82011-12-15 11:17:37 +0100626 rcu_read_lock();
627 return NULL;
628 }
629
Johannes Berg55de9082012-07-26 17:24:39 +0200630 rcu_read_lock();
631 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
632 if (WARN_ON_ONCE(!chanctx_conf))
633 return NULL;
Johannes Berg4bf88532012-11-09 11:39:59 +0100634 band = chanctx_conf->def.chan->band;
Simon Wunderlich74608ac2013-07-08 16:55:54 +0200635 scan_width = cfg80211_chandef_to_scan_width(&chanctx_conf->def);
Johannes Berg55de9082012-07-26 17:24:39 +0200636 rcu_read_unlock();
637
Johannes Berg8bf11d82011-12-15 11:17:37 +0100638 sta = sta_info_alloc(sdata, addr, GFP_KERNEL);
639 if (!sta) {
640 rcu_read_lock();
641 return NULL;
642 }
643
644 sta->last_rx = jiffies;
645
646 /* make sure mandatory rates are always added */
Ashok Nagarajanb422c6c2013-05-10 17:50:51 -0700647 sband = local->hw.wiphy->bands[band];
Johannes Berg8bf11d82011-12-15 11:17:37 +0100648 sta->sta.supp_rates[band] = supp_rates |
Simon Wunderlich74608ac2013-07-08 16:55:54 +0200649 ieee80211_mandatory_rates(sband, scan_width);
Johannes Berg8bf11d82011-12-15 11:17:37 +0100650
Antonio Quartulli52874a52013-06-18 14:20:40 +0200651 return ieee80211_ibss_finish_sta(sta);
Antonio Quartulli6d810f12012-01-18 00:10:44 +0100652}
653
Simon Wunderlich871a4182013-08-28 13:41:30 +0200654static int ieee80211_sta_active_ibss(struct ieee80211_sub_if_data *sdata)
655{
656 struct ieee80211_local *local = sdata->local;
657 int active = 0;
658 struct sta_info *sta;
659
660 sdata_assert_lock(sdata);
661
662 rcu_read_lock();
663
664 list_for_each_entry_rcu(sta, &local->sta_list, list) {
665 if (sta->sdata == sdata &&
666 time_after(sta->last_rx + IEEE80211_IBSS_MERGE_INTERVAL,
667 jiffies)) {
668 active++;
669 break;
670 }
671 }
672
673 rcu_read_unlock();
674
675 return active;
676}
677
678static void ieee80211_ibss_disconnect(struct ieee80211_sub_if_data *sdata)
679{
680 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
681 struct ieee80211_local *local = sdata->local;
682 struct cfg80211_bss *cbss;
683 struct beacon_data *presp;
684 struct sta_info *sta;
Simon Wunderlich871a4182013-08-28 13:41:30 +0200685 u16 capability;
686
Sujith Manoharand4c80d92014-01-30 14:17:28 +0530687 if (!is_zero_ether_addr(ifibss->bssid)) {
Simon Wunderlich871a4182013-08-28 13:41:30 +0200688 capability = WLAN_CAPABILITY_IBSS;
689
690 if (ifibss->privacy)
691 capability |= WLAN_CAPABILITY_PRIVACY;
692
693 cbss = cfg80211_get_bss(local->hw.wiphy, ifibss->chandef.chan,
694 ifibss->bssid, ifibss->ssid,
695 ifibss->ssid_len, WLAN_CAPABILITY_IBSS |
696 WLAN_CAPABILITY_PRIVACY,
697 capability);
698
699 if (cbss) {
700 cfg80211_unlink_bss(local->hw.wiphy, cbss);
701 cfg80211_put_bss(sdata->local->hw.wiphy, cbss);
702 }
703 }
704
705 ifibss->state = IEEE80211_IBSS_MLME_SEARCH;
706
707 sta_info_flush(sdata);
708
709 spin_lock_bh(&ifibss->incomplete_lock);
710 while (!list_empty(&ifibss->incomplete_stations)) {
711 sta = list_first_entry(&ifibss->incomplete_stations,
712 struct sta_info, list);
713 list_del(&sta->list);
714 spin_unlock_bh(&ifibss->incomplete_lock);
715
716 sta_info_free(local, sta);
717 spin_lock_bh(&ifibss->incomplete_lock);
718 }
719 spin_unlock_bh(&ifibss->incomplete_lock);
720
721 netif_carrier_off(sdata->dev);
722
723 sdata->vif.bss_conf.ibss_joined = false;
724 sdata->vif.bss_conf.ibss_creator = false;
725 sdata->vif.bss_conf.enable_beacon = false;
726 sdata->vif.bss_conf.ssid_len = 0;
727
728 /* remove beacon */
729 presp = rcu_dereference_protected(ifibss->presp,
730 lockdep_is_held(&sdata->wdev.mtx));
731 RCU_INIT_POINTER(sdata->u.ibss.presp, NULL);
732 if (presp)
733 kfree_rcu(presp, rcu_head);
734
735 clear_bit(SDATA_STATE_OFFCHANNEL_BEACON_STOPPED, &sdata->state);
736 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BEACON_ENABLED |
737 BSS_CHANGED_IBSS);
Johannes Berg55fff502013-08-19 18:48:41 +0200738 drv_leave_ibss(local, sdata);
Johannes Berg34a37402013-12-18 09:43:33 +0100739 mutex_lock(&local->mtx);
Simon Wunderlich871a4182013-08-28 13:41:30 +0200740 ieee80211_vif_release_channel(sdata);
Johannes Berg34a37402013-12-18 09:43:33 +0100741 mutex_unlock(&local->mtx);
Simon Wunderlich871a4182013-08-28 13:41:30 +0200742}
743
Simon Wunderlichcd7760e2013-08-28 13:41:31 +0200744static void ieee80211_csa_connection_drop_work(struct work_struct *work)
745{
746 struct ieee80211_sub_if_data *sdata =
747 container_of(work, struct ieee80211_sub_if_data,
748 u.ibss.csa_connection_drop_work);
749
Luciano Coelho6f07d212013-12-11 20:39:46 +0200750 sdata_lock(sdata);
751
Simon Wunderlichcd7760e2013-08-28 13:41:31 +0200752 ieee80211_ibss_disconnect(sdata);
753 synchronize_rcu();
754 skb_queue_purge(&sdata->skb_queue);
755
756 /* trigger a scan to find another IBSS network to join */
757 ieee80211_queue_work(&sdata->local->hw, &sdata->work);
Luciano Coelho6f07d212013-12-11 20:39:46 +0200758
759 sdata_unlock(sdata);
Simon Wunderlichcd7760e2013-08-28 13:41:31 +0200760}
761
Simon Wunderlich8e8d3472013-10-07 18:41:06 +0200762static void ieee80211_ibss_csa_mark_radar(struct ieee80211_sub_if_data *sdata)
763{
764 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
765 int err;
766
767 /* if the current channel is a DFS channel, mark the channel as
768 * unavailable.
769 */
770 err = cfg80211_chandef_dfs_required(sdata->local->hw.wiphy,
Luciano Coelho2beb6dab2014-02-18 11:40:36 +0200771 &ifibss->chandef,
772 NL80211_IFTYPE_ADHOC);
Simon Wunderlich8e8d3472013-10-07 18:41:06 +0200773 if (err > 0)
774 cfg80211_radar_event(sdata->local->hw.wiphy, &ifibss->chandef,
775 GFP_ATOMIC);
776}
777
Simon Wunderlichcd7760e2013-08-28 13:41:31 +0200778static bool
779ieee80211_ibss_process_chanswitch(struct ieee80211_sub_if_data *sdata,
780 struct ieee802_11_elems *elems,
781 bool beacon)
782{
783 struct cfg80211_csa_settings params;
Chun-Yeow Yeohc0f17eb2013-10-14 19:08:29 -0700784 struct ieee80211_csa_ie csa_ie;
Simon Wunderlichcd7760e2013-08-28 13:41:31 +0200785 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
Simon Wunderlichcd7760e2013-08-28 13:41:31 +0200786 enum nl80211_channel_type ch_type;
Luciano Coelho82a8e172013-12-13 21:13:50 +0200787 int err;
Simon Wunderlichcd7760e2013-08-28 13:41:31 +0200788 u32 sta_flags;
Simon Wunderlichcd7760e2013-08-28 13:41:31 +0200789
Michal Kaziordbd72852014-01-29 07:56:21 +0100790 sdata_assert_lock(sdata);
791
Simon Wunderlichcd7760e2013-08-28 13:41:31 +0200792 sta_flags = IEEE80211_STA_DISABLE_VHT;
793 switch (ifibss->chandef.width) {
794 case NL80211_CHAN_WIDTH_5:
795 case NL80211_CHAN_WIDTH_10:
796 case NL80211_CHAN_WIDTH_20_NOHT:
797 sta_flags |= IEEE80211_STA_DISABLE_HT;
798 /* fall through */
799 case NL80211_CHAN_WIDTH_20:
800 sta_flags |= IEEE80211_STA_DISABLE_40MHZ;
801 break;
802 default:
803 break;
804 }
805
806 memset(&params, 0, sizeof(params));
Chun-Yeow Yeohc0f17eb2013-10-14 19:08:29 -0700807 memset(&csa_ie, 0, sizeof(csa_ie));
Luciano Coelho84469a42014-10-28 13:33:04 +0200808 err = ieee80211_parse_ch_switch_ie(sdata, elems,
Simon Wunderlichcd7760e2013-08-28 13:41:31 +0200809 ifibss->chandef.chan->band,
Chun-Yeow Yeohc0f17eb2013-10-14 19:08:29 -0700810 sta_flags, ifibss->bssid, &csa_ie);
Simon Wunderlichcd7760e2013-08-28 13:41:31 +0200811 /* can't switch to destination channel, fail */
812 if (err < 0)
813 goto disconnect;
814
815 /* did not contain a CSA */
816 if (err)
817 return false;
818
Simon Wunderlich0834ae32013-11-26 16:45:18 +0100819 /* channel switch is not supported, disconnect */
820 if (!(sdata->local->hw.wiphy->flags & WIPHY_FLAG_HAS_CHANNEL_SWITCH))
821 goto disconnect;
822
Chun-Yeow Yeohc0f17eb2013-10-14 19:08:29 -0700823 params.count = csa_ie.count;
824 params.chandef = csa_ie.chandef;
825
Simon Wunderlichcd7760e2013-08-28 13:41:31 +0200826 switch (ifibss->chandef.width) {
827 case NL80211_CHAN_WIDTH_20_NOHT:
828 case NL80211_CHAN_WIDTH_20:
829 case NL80211_CHAN_WIDTH_40:
830 /* keep our current HT mode (HT20/HT40+/HT40-), even if
831 * another mode has been announced. The mode is not adopted
832 * within the beacon while doing CSA and we should therefore
833 * keep the mode which we announce.
834 */
835 ch_type = cfg80211_get_chandef_type(&ifibss->chandef);
836 cfg80211_chandef_create(&params.chandef, params.chandef.chan,
837 ch_type);
838 break;
839 case NL80211_CHAN_WIDTH_5:
840 case NL80211_CHAN_WIDTH_10:
841 if (params.chandef.width != ifibss->chandef.width) {
842 sdata_info(sdata,
843 "IBSS %pM received channel switch from incompatible channel width (%d MHz, width:%d, CF1/2: %d/%d MHz), disconnecting\n",
844 ifibss->bssid,
845 params.chandef.chan->center_freq,
846 params.chandef.width,
847 params.chandef.center_freq1,
848 params.chandef.center_freq2);
849 goto disconnect;
850 }
851 break;
852 default:
853 /* should not happen, sta_flags should prevent VHT modes. */
854 WARN_ON(1);
855 goto disconnect;
856 }
857
Ilan Peer174e0cd2014-02-23 09:13:01 +0200858 if (!cfg80211_reg_can_beacon(sdata->local->hw.wiphy, &params.chandef,
859 NL80211_IFTYPE_ADHOC)) {
Simon Wunderlichcd7760e2013-08-28 13:41:31 +0200860 sdata_info(sdata,
861 "IBSS %pM switches to unsupported channel (%d MHz, width:%d, CF1/2: %d/%d MHz), disconnecting\n",
862 ifibss->bssid,
863 params.chandef.chan->center_freq,
864 params.chandef.width,
865 params.chandef.center_freq1,
866 params.chandef.center_freq2);
867 goto disconnect;
868 }
869
870 err = cfg80211_chandef_dfs_required(sdata->local->hw.wiphy,
Luciano Coelho2beb6dab2014-02-18 11:40:36 +0200871 &params.chandef,
872 NL80211_IFTYPE_ADHOC);
Simon Wunderlichcd7760e2013-08-28 13:41:31 +0200873 if (err < 0)
874 goto disconnect;
Luciano Coelho2beb6dab2014-02-18 11:40:36 +0200875 if (err > 0 && !ifibss->userspace_handles_dfs) {
Simon Wunderlich8e8d3472013-10-07 18:41:06 +0200876 /* IBSS-DFS only allowed with a control program */
Luciano Coelho2beb6dab2014-02-18 11:40:36 +0200877 goto disconnect;
Simon Wunderlichcd7760e2013-08-28 13:41:31 +0200878 }
879
Luciano Coelho2beb6dab2014-02-18 11:40:36 +0200880 params.radar_required = err;
881
Luciano Coelho82a8e172013-12-13 21:13:50 +0200882 if (cfg80211_chandef_identical(&params.chandef,
883 &sdata->vif.bss_conf.chandef)) {
884 ibss_dbg(sdata,
885 "received csa with an identical chandef, ignoring\n");
886 return true;
Simon Wunderlichcd7760e2013-08-28 13:41:31 +0200887 }
888
Simon Wunderlichcd7760e2013-08-28 13:41:31 +0200889 /* all checks done, now perform the channel switch. */
890 ibss_dbg(sdata,
891 "received channel switch announcement to go to channel %d MHz\n",
892 params.chandef.chan->center_freq);
893
Chun-Yeow Yeohc0f17eb2013-10-14 19:08:29 -0700894 params.block_tx = !!csa_ie.mode;
Simon Wunderlichcd7760e2013-08-28 13:41:31 +0200895
Luciano Coelho82a8e172013-12-13 21:13:50 +0200896 if (ieee80211_channel_switch(sdata->local->hw.wiphy, sdata->dev,
897 &params))
898 goto disconnect;
Simon Wunderlichcd7760e2013-08-28 13:41:31 +0200899
Simon Wunderlich8e8d3472013-10-07 18:41:06 +0200900 ieee80211_ibss_csa_mark_radar(sdata);
901
Simon Wunderlichcd7760e2013-08-28 13:41:31 +0200902 return true;
903disconnect:
904 ibss_dbg(sdata, "Can't handle channel switch, disconnect\n");
905 ieee80211_queue_work(&sdata->local->hw,
906 &ifibss->csa_connection_drop_work);
907
Simon Wunderlich8e8d3472013-10-07 18:41:06 +0200908 ieee80211_ibss_csa_mark_radar(sdata);
909
Simon Wunderlichcd7760e2013-08-28 13:41:31 +0200910 return true;
911}
912
913static void
914ieee80211_rx_mgmt_spectrum_mgmt(struct ieee80211_sub_if_data *sdata,
915 struct ieee80211_mgmt *mgmt, size_t len,
916 struct ieee80211_rx_status *rx_status,
917 struct ieee802_11_elems *elems)
918{
919 int required_len;
920
921 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
922 return;
923
924 /* CSA is the only action we handle for now */
925 if (mgmt->u.action.u.measurement.action_code !=
926 WLAN_ACTION_SPCT_CHL_SWITCH)
927 return;
928
929 required_len = IEEE80211_MIN_ACTION_SIZE +
930 sizeof(mgmt->u.action.u.chan_switch);
931 if (len < required_len)
932 return;
933
Luciano Coelho82a8e172013-12-13 21:13:50 +0200934 if (!sdata->vif.csa_active)
935 ieee80211_ibss_process_chanswitch(sdata, elems, false);
Simon Wunderlichcd7760e2013-08-28 13:41:31 +0200936}
937
Antonio Quartulli2cc59e72012-09-07 13:28:53 +0200938static void ieee80211_rx_mgmt_deauth_ibss(struct ieee80211_sub_if_data *sdata,
939 struct ieee80211_mgmt *mgmt,
940 size_t len)
941{
942 u16 reason = le16_to_cpu(mgmt->u.deauth.reason_code);
943
944 if (len < IEEE80211_DEAUTH_FRAME_LEN)
945 return;
946
947 ibss_dbg(sdata, "RX DeAuth SA=%pM DA=%pM BSSID=%pM (reason: %d)\n",
948 mgmt->sa, mgmt->da, mgmt->bssid, reason);
949 sta_info_destroy_addr(sdata, mgmt->sa);
950}
951
Antonio Quartulli6d810f12012-01-18 00:10:44 +0100952static void ieee80211_rx_mgmt_auth_ibss(struct ieee80211_sub_if_data *sdata,
953 struct ieee80211_mgmt *mgmt,
954 size_t len)
955{
956 u16 auth_alg, auth_transaction;
957
Johannes Berg8d61ffa2013-05-10 12:32:47 +0200958 sdata_assert_lock(sdata);
Antonio Quartulli6d810f12012-01-18 00:10:44 +0100959
960 if (len < 24 + 6)
961 return;
962
963 auth_alg = le16_to_cpu(mgmt->u.auth.auth_alg);
964 auth_transaction = le16_to_cpu(mgmt->u.auth.auth_transaction);
965
Johannes Bergbdcbd8e2012-06-22 11:29:50 +0200966 ibss_dbg(sdata,
967 "RX Auth SA=%pM DA=%pM BSSID=%pM (auth_transaction=%d)\n",
968 mgmt->sa, mgmt->da, mgmt->bssid, auth_transaction);
Antonio Quartulli7bed2052012-11-25 23:24:27 +0100969
970 if (auth_alg != WLAN_AUTH_OPEN || auth_transaction != 1)
971 return;
972
Antonio Quartulli2cc59e72012-09-07 13:28:53 +0200973 /*
Antonio Quartulli6d810f12012-01-18 00:10:44 +0100974 * IEEE 802.11 standard does not require authentication in IBSS
975 * networks and most implementations do not seem to use it.
976 * However, try to reply to authentication attempts if someone
977 * has actually implemented this.
978 */
Jouni Malinen700e8ea2012-09-30 19:29:37 +0300979 ieee80211_send_auth(sdata, 2, WLAN_AUTH_OPEN, 0, NULL, 0,
Johannes Berg1672c0e32013-01-29 15:02:27 +0100980 mgmt->sa, sdata->u.ibss.bssid, NULL, 0, 0, 0);
Johannes Berg8bf11d82011-12-15 11:17:37 +0100981}
982
Johannes Berg46900292009-02-15 12:44:28 +0100983static void ieee80211_rx_bss_info(struct ieee80211_sub_if_data *sdata,
Emmanuel Grumbachd45c4172012-12-10 16:19:13 +0200984 struct ieee80211_mgmt *mgmt, size_t len,
Johannes Berg46900292009-02-15 12:44:28 +0100985 struct ieee80211_rx_status *rx_status,
Emmanuel Grumbachd45c4172012-12-10 16:19:13 +0200986 struct ieee802_11_elems *elems)
Johannes Berg46900292009-02-15 12:44:28 +0100987{
988 struct ieee80211_local *local = sdata->local;
Johannes Berg0c1ad2c2009-12-23 13:15:39 +0100989 struct cfg80211_bss *cbss;
Johannes Berg46900292009-02-15 12:44:28 +0100990 struct ieee80211_bss *bss;
991 struct sta_info *sta;
992 struct ieee80211_channel *channel;
993 u64 beacon_timestamp, rx_timestamp;
994 u32 supp_rates = 0;
995 enum ieee80211_band band = rx_status->band;
Simon Wunderlich74608ac2013-07-08 16:55:54 +0200996 enum nl80211_bss_scan_width scan_width;
Alexander Simon13c40c52011-11-30 16:56:34 +0100997 struct ieee80211_supported_band *sband = local->hw.wiphy->bands[band];
998 bool rates_updated = false;
Johannes Berg46900292009-02-15 12:44:28 +0100999
Emmanuel Grumbach3afc2162014-03-04 16:50:13 +02001000 channel = ieee80211_get_channel(local->hw.wiphy, rx_status->freq);
1001 if (!channel)
Johannes Berg46900292009-02-15 12:44:28 +01001002 return;
1003
Bruno Randolf9eba6122010-10-04 11:17:30 +09001004 if (sdata->vif.type == NL80211_IFTYPE_ADHOC &&
Joe Perchesb203ca32012-05-08 18:56:52 +00001005 ether_addr_equal(mgmt->bssid, sdata->u.ibss.bssid)) {
Johannes Berg46900292009-02-15 12:44:28 +01001006
1007 rcu_read_lock();
Johannes Bergabe60632009-11-25 17:46:18 +01001008 sta = sta_info_get(sdata, mgmt->sa);
Johannes Berg46900292009-02-15 12:44:28 +01001009
Bruno Randolf9eba6122010-10-04 11:17:30 +09001010 if (elems->supp_rates) {
Simon Wunderlich2103dec2013-07-08 16:55:53 +02001011 supp_rates = ieee80211_sta_get_rates(sdata, elems,
Ashok Nagarajan9ebb61a2012-04-02 21:21:21 -07001012 band, NULL);
Bruno Randolf9eba6122010-10-04 11:17:30 +09001013 if (sta) {
1014 u32 prev_rates;
Johannes Berg46900292009-02-15 12:44:28 +01001015
Bruno Randolf9eba6122010-10-04 11:17:30 +09001016 prev_rates = sta->sta.supp_rates[band];
1017 /* make sure mandatory rates are always added */
Simon Wunderlich74608ac2013-07-08 16:55:54 +02001018 scan_width = NL80211_BSS_CHAN_WIDTH_20;
1019 if (rx_status->flag & RX_FLAG_5MHZ)
1020 scan_width = NL80211_BSS_CHAN_WIDTH_5;
1021 if (rx_status->flag & RX_FLAG_10MHZ)
1022 scan_width = NL80211_BSS_CHAN_WIDTH_10;
Bruno Randolf9eba6122010-10-04 11:17:30 +09001023
Simon Wunderlich74608ac2013-07-08 16:55:54 +02001024 sta->sta.supp_rates[band] = supp_rates |
1025 ieee80211_mandatory_rates(sband,
1026 scan_width);
Bruno Randolf9eba6122010-10-04 11:17:30 +09001027 if (sta->sta.supp_rates[band] != prev_rates) {
Johannes Bergbdcbd8e2012-06-22 11:29:50 +02001028 ibss_dbg(sdata,
1029 "updated supp_rates set for %pM based on beacon/probe_resp (0x%x -> 0x%x)\n",
1030 sta->sta.addr, prev_rates,
1031 sta->sta.supp_rates[band]);
Alexander Simon13c40c52011-11-30 16:56:34 +01001032 rates_updated = true;
Bruno Randolf9eba6122010-10-04 11:17:30 +09001033 }
Johannes Berg8bf11d82011-12-15 11:17:37 +01001034 } else {
1035 rcu_read_unlock();
Bruno Randolf9eba6122010-10-04 11:17:30 +09001036 sta = ieee80211_ibss_add_sta(sdata, mgmt->bssid,
Antonio Quartulli52874a52013-06-18 14:20:40 +02001037 mgmt->sa, supp_rates);
Johannes Berg8bf11d82011-12-15 11:17:37 +01001038 }
Johannes Berg34e89502010-02-03 13:59:58 +01001039 }
Bruno Randolf9eba6122010-10-04 11:17:30 +09001040
1041 if (sta && elems->wmm_info)
Johannes Berga74a8c82014-07-22 14:50:47 +02001042 sta->sta.wme = true;
Bruno Randolf9eba6122010-10-04 11:17:30 +09001043
Johannes Berg074d46d2012-03-15 19:45:16 +01001044 if (sta && elems->ht_operation && elems->ht_cap_elem &&
Simon Wunderlich3aede782013-05-16 13:00:36 +02001045 sdata->u.ibss.chandef.width != NL80211_CHAN_WIDTH_20_NOHT &&
1046 sdata->u.ibss.chandef.width != NL80211_CHAN_WIDTH_5 &&
1047 sdata->u.ibss.chandef.width != NL80211_CHAN_WIDTH_10) {
Alexander Simon13c40c52011-11-30 16:56:34 +01001048 /* we both use HT */
Johannes Berge1a0c6b2013-02-07 11:47:44 +01001049 struct ieee80211_ht_cap htcap_ie;
Johannes Berg4bf88532012-11-09 11:39:59 +01001050 struct cfg80211_chan_def chandef;
1051
1052 ieee80211_ht_oper_to_chandef(channel,
1053 elems->ht_operation,
1054 &chandef);
Alexander Simon13c40c52011-11-30 16:56:34 +01001055
Johannes Berge1a0c6b2013-02-07 11:47:44 +01001056 memcpy(&htcap_ie, elems->ht_cap_elem, sizeof(htcap_ie));
Alexander Simon13c40c52011-11-30 16:56:34 +01001057
1058 /*
1059 * fall back to HT20 if we don't use or use
1060 * the other extension channel
1061 */
Simon Wunderlich3aede782013-05-16 13:00:36 +02001062 if (chandef.center_freq1 !=
1063 sdata->u.ibss.chandef.center_freq1)
Johannes Berge1a0c6b2013-02-07 11:47:44 +01001064 htcap_ie.cap_info &=
1065 cpu_to_le16(~IEEE80211_HT_CAP_SUP_WIDTH_20_40);
Alexander Simon13c40c52011-11-30 16:56:34 +01001066
Johannes Berge1a0c6b2013-02-07 11:47:44 +01001067 rates_updated |= ieee80211_ht_cap_ie_to_sta_ht_cap(
1068 sdata, sband, &htcap_ie, sta);
Alexander Simon13c40c52011-11-30 16:56:34 +01001069 }
1070
Antonio Quartullie687f612012-08-12 18:24:55 +02001071 if (sta && rates_updated) {
Janusz Dziedzicd29544572014-12-17 10:00:52 +01001072 u32 changed = IEEE80211_RC_SUPP_RATES_CHANGED;
1073 u8 rx_nss = sta->sta.rx_nss;
1074
1075 /* Force rx_nss recalculation */
1076 sta->sta.rx_nss = 0;
Alexander Simon13c40c52011-11-30 16:56:34 +01001077 rate_control_rate_init(sta);
Janusz Dziedzicd29544572014-12-17 10:00:52 +01001078 if (sta->sta.rx_nss != rx_nss)
1079 changed |= IEEE80211_RC_NSS_CHANGED;
1080
1081 drv_sta_rc_update(local, sdata, &sta->sta, changed);
Antonio Quartullie687f612012-08-12 18:24:55 +02001082 }
Alexander Simon13c40c52011-11-30 16:56:34 +01001083
Bruno Randolf9eba6122010-10-04 11:17:30 +09001084 rcu_read_unlock();
Johannes Berg46900292009-02-15 12:44:28 +01001085 }
1086
1087 bss = ieee80211_bss_info_update(local, rx_status, mgmt, len, elems,
Emmanuel Grumbachd45c4172012-12-10 16:19:13 +02001088 channel);
Johannes Berg46900292009-02-15 12:44:28 +01001089 if (!bss)
1090 return;
1091
Johannes Berg0c1ad2c2009-12-23 13:15:39 +01001092 cbss = container_of((void *)bss, struct cfg80211_bss, priv);
1093
Johannes Berg8cef2c92013-02-05 16:54:31 +01001094 /* same for beacon and probe response */
1095 beacon_timestamp = le64_to_cpu(mgmt->u.beacon.timestamp);
Johannes Berg46900292009-02-15 12:44:28 +01001096
1097 /* check if we need to merge IBSS */
1098
Johannes Berg46900292009-02-15 12:44:28 +01001099 /* not an IBSS */
Johannes Berg0c1ad2c2009-12-23 13:15:39 +01001100 if (!(cbss->capability & WLAN_CAPABILITY_IBSS))
Johannes Berg46900292009-02-15 12:44:28 +01001101 goto put_bss;
1102
1103 /* different channel */
Johannes Berg55de9082012-07-26 17:24:39 +02001104 if (sdata->u.ibss.fixed_channel &&
Simon Wunderlich3aede782013-05-16 13:00:36 +02001105 sdata->u.ibss.chandef.chan != cbss->channel)
Johannes Berg46900292009-02-15 12:44:28 +01001106 goto put_bss;
1107
1108 /* different SSID */
1109 if (elems->ssid_len != sdata->u.ibss.ssid_len ||
1110 memcmp(elems->ssid, sdata->u.ibss.ssid,
1111 sdata->u.ibss.ssid_len))
1112 goto put_bss;
1113
Simon Wunderlichcd7760e2013-08-28 13:41:31 +02001114 /* process channel switch */
Luciano Coelho82a8e172013-12-13 21:13:50 +02001115 if (sdata->vif.csa_active ||
1116 ieee80211_ibss_process_chanswitch(sdata, elems, true))
Simon Wunderlichcd7760e2013-08-28 13:41:31 +02001117 goto put_bss;
1118
Alina Friedrichsen34e8f082009-02-22 00:07:28 +01001119 /* same BSSID */
Joe Perchesb203ca32012-05-08 18:56:52 +00001120 if (ether_addr_equal(cbss->bssid, sdata->u.ibss.bssid))
Alina Friedrichsen34e8f082009-02-22 00:07:28 +01001121 goto put_bss;
1122
Simon Wunderlichcd7760e2013-08-28 13:41:31 +02001123 /* we use a fixed BSSID */
1124 if (sdata->u.ibss.fixed_bssid)
1125 goto put_bss;
1126
Thomas Pedersenf4bda332012-11-13 10:46:27 -08001127 if (ieee80211_have_rx_timestamp(rx_status)) {
1128 /* time when timestamp field was received */
1129 rx_timestamp =
1130 ieee80211_calculate_rx_timestamp(local, rx_status,
1131 len + FCS_LEN, 24);
Johannes Berg24487982009-04-23 18:52:52 +02001132 } else {
1133 /*
1134 * second best option: get current TSF
1135 * (will return -1 if not supported)
1136 */
Eliad Peller37a41b42011-09-21 14:06:11 +03001137 rx_timestamp = drv_get_tsf(local, sdata);
Johannes Berg24487982009-04-23 18:52:52 +02001138 }
Johannes Berg46900292009-02-15 12:44:28 +01001139
Johannes Bergbdcbd8e2012-06-22 11:29:50 +02001140 ibss_dbg(sdata,
1141 "RX beacon SA=%pM BSSID=%pM TSF=0x%llx BCN=0x%llx diff=%lld @%lu\n",
1142 mgmt->sa, mgmt->bssid,
1143 (unsigned long long)rx_timestamp,
1144 (unsigned long long)beacon_timestamp,
1145 (unsigned long long)(rx_timestamp - beacon_timestamp),
1146 jiffies);
Johannes Berg46900292009-02-15 12:44:28 +01001147
1148 if (beacon_timestamp > rx_timestamp) {
Johannes Bergbdcbd8e2012-06-22 11:29:50 +02001149 ibss_dbg(sdata,
1150 "beacon TSF higher than local TSF - IBSS merge with BSSID %pM\n",
1151 mgmt->bssid);
Johannes Berg46900292009-02-15 12:44:28 +01001152 ieee80211_sta_join_ibss(sdata, bss);
Simon Wunderlich2103dec2013-07-08 16:55:53 +02001153 supp_rates = ieee80211_sta_get_rates(sdata, elems, band, NULL);
Johannes Berg34e89502010-02-03 13:59:58 +01001154 ieee80211_ibss_add_sta(sdata, mgmt->bssid, mgmt->sa,
Antonio Quartulli52874a52013-06-18 14:20:40 +02001155 supp_rates);
Johannes Berg8bf11d82011-12-15 11:17:37 +01001156 rcu_read_unlock();
Johannes Berg46900292009-02-15 12:44:28 +01001157 }
1158
1159 put_bss:
1160 ieee80211_rx_bss_put(local, bss);
1161}
1162
Johannes Berg8bf11d82011-12-15 11:17:37 +01001163void ieee80211_ibss_rx_no_sta(struct ieee80211_sub_if_data *sdata,
1164 const u8 *bssid, const u8 *addr,
1165 u32 supp_rates)
Johannes Berg46900292009-02-15 12:44:28 +01001166{
Felix Fietkau2e10d332009-12-20 19:07:09 +01001167 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
Johannes Berg46900292009-02-15 12:44:28 +01001168 struct ieee80211_local *local = sdata->local;
1169 struct sta_info *sta;
Johannes Berg55de9082012-07-26 17:24:39 +02001170 struct ieee80211_chanctx_conf *chanctx_conf;
Ashok Nagarajanb422c6c2013-05-10 17:50:51 -07001171 struct ieee80211_supported_band *sband;
Simon Wunderlich74608ac2013-07-08 16:55:54 +02001172 enum nl80211_bss_scan_width scan_width;
Johannes Berg55de9082012-07-26 17:24:39 +02001173 int band;
Johannes Berg46900292009-02-15 12:44:28 +01001174
Johannes Bergaf8cdcd2009-04-19 21:25:43 +02001175 /*
1176 * XXX: Consider removing the least recently used entry and
1177 * allow new one to be added.
1178 */
Johannes Berg46900292009-02-15 12:44:28 +01001179 if (local->num_sta >= IEEE80211_IBSS_MAX_STA_ENTRIES) {
Johannes Bergbdcbd8e2012-06-22 11:29:50 +02001180 net_info_ratelimited("%s: No room for a new IBSS STA entry %pM\n",
Joe Perchese87cc472012-05-13 21:56:26 +00001181 sdata->name, addr);
Johannes Berg8bf11d82011-12-15 11:17:37 +01001182 return;
Johannes Berg46900292009-02-15 12:44:28 +01001183 }
1184
Felix Fietkau2e10d332009-12-20 19:07:09 +01001185 if (ifibss->state == IEEE80211_IBSS_MLME_SEARCH)
Johannes Berg8bf11d82011-12-15 11:17:37 +01001186 return;
Felix Fietkau2e10d332009-12-20 19:07:09 +01001187
Joe Perchesb203ca32012-05-08 18:56:52 +00001188 if (!ether_addr_equal(bssid, sdata->u.ibss.bssid))
Johannes Berg8bf11d82011-12-15 11:17:37 +01001189 return;
Johannes Berg46900292009-02-15 12:44:28 +01001190
Johannes Berg55de9082012-07-26 17:24:39 +02001191 rcu_read_lock();
1192 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
1193 if (WARN_ON_ONCE(!chanctx_conf)) {
1194 rcu_read_unlock();
1195 return;
1196 }
Johannes Berg4bf88532012-11-09 11:39:59 +01001197 band = chanctx_conf->def.chan->band;
Simon Wunderlich74608ac2013-07-08 16:55:54 +02001198 scan_width = cfg80211_chandef_to_scan_width(&chanctx_conf->def);
Johannes Berg55de9082012-07-26 17:24:39 +02001199 rcu_read_unlock();
1200
Johannes Berg8bf11d82011-12-15 11:17:37 +01001201 sta = sta_info_alloc(sdata, addr, GFP_ATOMIC);
Johannes Berg46900292009-02-15 12:44:28 +01001202 if (!sta)
Johannes Berg8bf11d82011-12-15 11:17:37 +01001203 return;
Johannes Berg46900292009-02-15 12:44:28 +01001204
Rajkumar Manoharanc8716d92010-10-23 10:59:57 +05301205 sta->last_rx = jiffies;
Johannes Bergd9a7ddb2011-12-14 12:35:30 +01001206
Johannes Berg46900292009-02-15 12:44:28 +01001207 /* make sure mandatory rates are always added */
Ashok Nagarajanb422c6c2013-05-10 17:50:51 -07001208 sband = local->hw.wiphy->bands[band];
Johannes Berg46900292009-02-15 12:44:28 +01001209 sta->sta.supp_rates[band] = supp_rates |
Simon Wunderlich74608ac2013-07-08 16:55:54 +02001210 ieee80211_mandatory_rates(sband, scan_width);
Johannes Berg46900292009-02-15 12:44:28 +01001211
Johannes Berg8bf11d82011-12-15 11:17:37 +01001212 spin_lock(&ifibss->incomplete_lock);
1213 list_add(&sta->list, &ifibss->incomplete_stations);
1214 spin_unlock(&ifibss->incomplete_lock);
1215 ieee80211_queue_work(&local->hw, &sdata->work);
Johannes Berg46900292009-02-15 12:44:28 +01001216}
1217
Antonio Quartullidad9def2013-07-26 21:15:02 +02001218static void ieee80211_ibss_sta_expire(struct ieee80211_sub_if_data *sdata)
1219{
1220 struct ieee80211_local *local = sdata->local;
1221 struct sta_info *sta, *tmp;
1222 unsigned long exp_time = IEEE80211_IBSS_INACTIVITY_LIMIT;
1223 unsigned long exp_rsn_time = IEEE80211_IBSS_RSN_INACTIVITY_LIMIT;
1224
1225 mutex_lock(&local->sta_mtx);
1226
1227 list_for_each_entry_safe(sta, tmp, &local->sta_list, list) {
1228 if (sdata != sta->sdata)
1229 continue;
1230
1231 if (time_after(jiffies, sta->last_rx + exp_time) ||
1232 (time_after(jiffies, sta->last_rx + exp_rsn_time) &&
1233 sta->sta_state != IEEE80211_STA_AUTHORIZED)) {
1234 sta_dbg(sta->sdata, "expiring inactive %sSTA %pM\n",
1235 sta->sta_state != IEEE80211_STA_AUTHORIZED ?
1236 "not authorized " : "", sta->sta.addr);
1237
1238 WARN_ON(__sta_info_destroy(sta));
1239 }
1240 }
1241
1242 mutex_unlock(&local->sta_mtx);
1243}
1244
Benoit Papillaultce9058a2010-01-17 22:45:23 +01001245/*
1246 * This function is called with state == IEEE80211_IBSS_MLME_JOINED
1247 */
Johannes Berg46900292009-02-15 12:44:28 +01001248
1249static void ieee80211_sta_merge_ibss(struct ieee80211_sub_if_data *sdata)
1250{
1251 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
Simon Wunderlich7ca15a02013-07-08 16:55:56 +02001252 enum nl80211_bss_scan_width scan_width;
Johannes Berg46900292009-02-15 12:44:28 +01001253
Johannes Berg8d61ffa2013-05-10 12:32:47 +02001254 sdata_assert_lock(sdata);
Johannes Berg7a17a332010-07-21 11:30:27 +02001255
Johannes Bergaf8cdcd2009-04-19 21:25:43 +02001256 mod_timer(&ifibss->timer,
1257 round_jiffies(jiffies + IEEE80211_IBSS_MERGE_INTERVAL));
Johannes Berg46900292009-02-15 12:44:28 +01001258
Antonio Quartullidad9def2013-07-26 21:15:02 +02001259 ieee80211_ibss_sta_expire(sdata);
Johannes Bergaf8cdcd2009-04-19 21:25:43 +02001260
Sujith450aae32009-11-02 12:33:23 +05301261 if (time_before(jiffies, ifibss->last_scan_completed +
1262 IEEE80211_IBSS_MERGE_INTERVAL))
1263 return;
1264
Johannes Berg46900292009-02-15 12:44:28 +01001265 if (ieee80211_sta_active_ibss(sdata))
1266 return;
1267
John W. Linvillec037b832012-01-30 15:28:11 -05001268 if (ifibss->fixed_channel)
Johannes Berg46900292009-02-15 12:44:28 +01001269 return;
1270
Johannes Bergbdcbd8e2012-06-22 11:29:50 +02001271 sdata_info(sdata,
1272 "No active IBSS STAs - trying to scan for other IBSS networks with same SSID (merge)\n");
Johannes Berg46900292009-02-15 12:44:28 +01001273
Simon Wunderlich7ca15a02013-07-08 16:55:56 +02001274 scan_width = cfg80211_chandef_to_scan_width(&ifibss->chandef);
Stanislaw Gruszka34bcf712012-12-11 10:48:23 +01001275 ieee80211_request_ibss_scan(sdata, ifibss->ssid, ifibss->ssid_len,
Simon Wunderlich7ca15a02013-07-08 16:55:56 +02001276 NULL, scan_width);
Johannes Berg46900292009-02-15 12:44:28 +01001277}
1278
Johannes Bergaf8cdcd2009-04-19 21:25:43 +02001279static void ieee80211_sta_create_ibss(struct ieee80211_sub_if_data *sdata)
Johannes Berg46900292009-02-15 12:44:28 +01001280{
1281 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
Johannes Berg46900292009-02-15 12:44:28 +01001282 u8 bssid[ETH_ALEN];
Johannes Berg46900292009-02-15 12:44:28 +01001283 u16 capability;
1284 int i;
1285
Johannes Berg8d61ffa2013-05-10 12:32:47 +02001286 sdata_assert_lock(sdata);
Johannes Berg7a17a332010-07-21 11:30:27 +02001287
Johannes Bergaf8cdcd2009-04-19 21:25:43 +02001288 if (ifibss->fixed_bssid) {
Johannes Berg46900292009-02-15 12:44:28 +01001289 memcpy(bssid, ifibss->bssid, ETH_ALEN);
1290 } else {
1291 /* Generate random, not broadcast, locally administered BSSID. Mix in
1292 * own MAC address to make sure that devices that do not have proper
1293 * random number generator get different BSSID. */
1294 get_random_bytes(bssid, ETH_ALEN);
1295 for (i = 0; i < ETH_ALEN; i++)
Johannes Berg47846c92009-11-25 17:46:19 +01001296 bssid[i] ^= sdata->vif.addr[i];
Johannes Berg46900292009-02-15 12:44:28 +01001297 bssid[0] &= ~0x01;
1298 bssid[0] |= 0x02;
1299 }
1300
Johannes Bergbdcbd8e2012-06-22 11:29:50 +02001301 sdata_info(sdata, "Creating new IBSS network, BSSID %pM\n", bssid);
Johannes Berg46900292009-02-15 12:44:28 +01001302
Johannes Berg46900292009-02-15 12:44:28 +01001303 capability = WLAN_CAPABILITY_IBSS;
1304
Johannes Bergfffd0932009-07-08 14:22:54 +02001305 if (ifibss->privacy)
Johannes Berg46900292009-02-15 12:44:28 +01001306 capability |= WLAN_CAPABILITY_PRIVACY;
1307 else
1308 sdata->drop_unencrypted = 0;
1309
Johannes Berg57c4d7b2009-04-23 16:10:04 +02001310 __ieee80211_sta_join_ibss(sdata, bssid, sdata->vif.bss_conf.beacon_int,
Simon Wunderlich75a423f2013-08-21 15:30:25 +02001311 &ifibss->chandef, ifibss->basic_rates,
Sujith Manoharanc13a7652012-10-12 17:35:45 +05301312 capability, 0, true);
Johannes Berg46900292009-02-15 12:44:28 +01001313}
1314
Benoit Papillaultce9058a2010-01-17 22:45:23 +01001315/*
1316 * This function is called with state == IEEE80211_IBSS_MLME_SEARCH
1317 */
1318
Johannes Bergaf8cdcd2009-04-19 21:25:43 +02001319static void ieee80211_sta_find_ibss(struct ieee80211_sub_if_data *sdata)
Johannes Berg46900292009-02-15 12:44:28 +01001320{
1321 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1322 struct ieee80211_local *local = sdata->local;
Johannes Berg0c1ad2c2009-12-23 13:15:39 +01001323 struct cfg80211_bss *cbss;
Johannes Bergaf8cdcd2009-04-19 21:25:43 +02001324 struct ieee80211_channel *chan = NULL;
Johannes Berg46900292009-02-15 12:44:28 +01001325 const u8 *bssid = NULL;
Simon Wunderlich7ca15a02013-07-08 16:55:56 +02001326 enum nl80211_bss_scan_width scan_width;
Johannes Berg46900292009-02-15 12:44:28 +01001327 int active_ibss;
Johannes Berge0d61882009-05-12 20:47:32 +02001328 u16 capability;
Johannes Berg46900292009-02-15 12:44:28 +01001329
Johannes Berg8d61ffa2013-05-10 12:32:47 +02001330 sdata_assert_lock(sdata);
Johannes Berg7a17a332010-07-21 11:30:27 +02001331
Johannes Berg46900292009-02-15 12:44:28 +01001332 active_ibss = ieee80211_sta_active_ibss(sdata);
Johannes Bergbdcbd8e2012-06-22 11:29:50 +02001333 ibss_dbg(sdata, "sta_find_ibss (active_ibss=%d)\n", active_ibss);
Johannes Berg46900292009-02-15 12:44:28 +01001334
1335 if (active_ibss)
Johannes Bergaf8cdcd2009-04-19 21:25:43 +02001336 return;
Johannes Berg46900292009-02-15 12:44:28 +01001337
Johannes Berge0d61882009-05-12 20:47:32 +02001338 capability = WLAN_CAPABILITY_IBSS;
Johannes Bergfffd0932009-07-08 14:22:54 +02001339 if (ifibss->privacy)
Johannes Berge0d61882009-05-12 20:47:32 +02001340 capability |= WLAN_CAPABILITY_PRIVACY;
Johannes Bergaf8cdcd2009-04-19 21:25:43 +02001341 if (ifibss->fixed_bssid)
Johannes Berg46900292009-02-15 12:44:28 +01001342 bssid = ifibss->bssid;
Johannes Bergaf8cdcd2009-04-19 21:25:43 +02001343 if (ifibss->fixed_channel)
Simon Wunderlich3aede782013-05-16 13:00:36 +02001344 chan = ifibss->chandef.chan;
Johannes Bergaf8cdcd2009-04-19 21:25:43 +02001345 if (!is_zero_ether_addr(ifibss->bssid))
1346 bssid = ifibss->bssid;
Johannes Berg0c1ad2c2009-12-23 13:15:39 +01001347 cbss = cfg80211_get_bss(local->hw.wiphy, chan, bssid,
1348 ifibss->ssid, ifibss->ssid_len,
1349 WLAN_CAPABILITY_IBSS | WLAN_CAPABILITY_PRIVACY,
1350 capability);
Johannes Berg46900292009-02-15 12:44:28 +01001351
Johannes Berg0c1ad2c2009-12-23 13:15:39 +01001352 if (cbss) {
1353 struct ieee80211_bss *bss;
1354
1355 bss = (void *)cbss->priv;
Johannes Bergbdcbd8e2012-06-22 11:29:50 +02001356 ibss_dbg(sdata,
1357 "sta_find_ibss: selected %pM current %pM\n",
1358 cbss->bssid, ifibss->bssid);
1359 sdata_info(sdata,
1360 "Selected IBSS BSSID %pM based on configured SSID\n",
1361 cbss->bssid);
Johannes Berg46900292009-02-15 12:44:28 +01001362
Johannes Bergaf8cdcd2009-04-19 21:25:43 +02001363 ieee80211_sta_join_ibss(sdata, bss);
Johannes Berg46900292009-02-15 12:44:28 +01001364 ieee80211_rx_bss_put(local, bss);
Johannes Bergaf8cdcd2009-04-19 21:25:43 +02001365 return;
Reinette Chatred419b9f2009-10-19 14:55:37 -07001366 }
Johannes Berg46900292009-02-15 12:44:28 +01001367
Antonio Quartullid8eb7412013-08-09 18:58:32 +02001368 /* if a fixed bssid and a fixed freq have been provided create the IBSS
1369 * directly and do not waste time scanning
1370 */
1371 if (ifibss->fixed_bssid && ifibss->fixed_channel) {
1372 sdata_info(sdata, "Created IBSS using preconfigured BSSID %pM\n",
1373 bssid);
1374 ieee80211_sta_create_ibss(sdata);
1375 return;
1376 }
1377
1378
Johannes Bergbdcbd8e2012-06-22 11:29:50 +02001379 ibss_dbg(sdata, "sta_find_ibss: did not try to join ibss\n");
Johannes Berg46900292009-02-15 12:44:28 +01001380
1381 /* Selected IBSS not found in current scan results - try to scan */
Benoit Papillaultce9058a2010-01-17 22:45:23 +01001382 if (time_after(jiffies, ifibss->last_scan_completed +
Johannes Berg46900292009-02-15 12:44:28 +01001383 IEEE80211_SCAN_INTERVAL)) {
Johannes Bergbdcbd8e2012-06-22 11:29:50 +02001384 sdata_info(sdata, "Trigger new scan to find an IBSS to join\n");
Johannes Berg46900292009-02-15 12:44:28 +01001385
Simon Wunderlich7ca15a02013-07-08 16:55:56 +02001386 scan_width = cfg80211_chandef_to_scan_width(&ifibss->chandef);
Stanislaw Gruszka34bcf712012-12-11 10:48:23 +01001387 ieee80211_request_ibss_scan(sdata, ifibss->ssid,
Simon Wunderlich7ca15a02013-07-08 16:55:56 +02001388 ifibss->ssid_len, chan,
1389 scan_width);
Benoit Papillaultce9058a2010-01-17 22:45:23 +01001390 } else {
Johannes Berg46900292009-02-15 12:44:28 +01001391 int interval = IEEE80211_SCAN_INTERVAL;
1392
1393 if (time_after(jiffies, ifibss->ibss_join_req +
Johannes Berg55de9082012-07-26 17:24:39 +02001394 IEEE80211_IBSS_JOIN_TIMEOUT))
1395 ieee80211_sta_create_ibss(sdata);
Johannes Berg46900292009-02-15 12:44:28 +01001396
Johannes Bergaf8cdcd2009-04-19 21:25:43 +02001397 mod_timer(&ifibss->timer,
1398 round_jiffies(jiffies + interval));
Johannes Berg46900292009-02-15 12:44:28 +01001399 }
Johannes Berg46900292009-02-15 12:44:28 +01001400}
1401
1402static void ieee80211_rx_mgmt_probe_req(struct ieee80211_sub_if_data *sdata,
Johannes Bergc269a202011-02-14 12:20:22 +01001403 struct sk_buff *req)
Johannes Berg46900292009-02-15 12:44:28 +01001404{
Johannes Bergc269a202011-02-14 12:20:22 +01001405 struct ieee80211_mgmt *mgmt = (void *)req->data;
Johannes Berg46900292009-02-15 12:44:28 +01001406 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1407 struct ieee80211_local *local = sdata->local;
Johannes Bergc269a202011-02-14 12:20:22 +01001408 int tx_last_beacon, len = req->len;
Johannes Berg46900292009-02-15 12:44:28 +01001409 struct sk_buff *skb;
Johannes Bergc3ffeab2013-03-07 20:54:29 +01001410 struct beacon_data *presp;
Johannes Berg46900292009-02-15 12:44:28 +01001411 u8 *pos, *end;
1412
Johannes Berg8d61ffa2013-05-10 12:32:47 +02001413 sdata_assert_lock(sdata);
Johannes Berg7a17a332010-07-21 11:30:27 +02001414
Johannes Berg40b275b2011-05-13 14:15:49 +02001415 presp = rcu_dereference_protected(ifibss->presp,
Johannes Berg8d61ffa2013-05-10 12:32:47 +02001416 lockdep_is_held(&sdata->wdev.mtx));
Johannes Berg40b275b2011-05-13 14:15:49 +02001417
Johannes Berg46900292009-02-15 12:44:28 +01001418 if (ifibss->state != IEEE80211_IBSS_MLME_JOINED ||
Johannes Berg40b275b2011-05-13 14:15:49 +02001419 len < 24 + 2 || !presp)
Johannes Berg46900292009-02-15 12:44:28 +01001420 return;
1421
Johannes Berg24487982009-04-23 18:52:52 +02001422 tx_last_beacon = drv_tx_last_beacon(local);
Johannes Berg46900292009-02-15 12:44:28 +01001423
Johannes Bergbdcbd8e2012-06-22 11:29:50 +02001424 ibss_dbg(sdata,
1425 "RX ProbeReq SA=%pM DA=%pM BSSID=%pM (tx_last_beacon=%d)\n",
1426 mgmt->sa, mgmt->da, mgmt->bssid, tx_last_beacon);
Johannes Berg46900292009-02-15 12:44:28 +01001427
Felix Fietkau1ed76482011-03-24 19:46:18 +01001428 if (!tx_last_beacon && is_multicast_ether_addr(mgmt->da))
Johannes Berg46900292009-02-15 12:44:28 +01001429 return;
1430
Joe Perchesb203ca32012-05-08 18:56:52 +00001431 if (!ether_addr_equal(mgmt->bssid, ifibss->bssid) &&
Felix Fietkau888d04d2012-03-01 15:22:09 +01001432 !is_broadcast_ether_addr(mgmt->bssid))
Johannes Berg46900292009-02-15 12:44:28 +01001433 return;
1434
1435 end = ((u8 *) mgmt) + len;
1436 pos = mgmt->u.probe_req.variable;
1437 if (pos[0] != WLAN_EID_SSID ||
1438 pos + 2 + pos[1] > end) {
Johannes Bergbdcbd8e2012-06-22 11:29:50 +02001439 ibss_dbg(sdata, "Invalid SSID IE in ProbeReq from %pM\n",
1440 mgmt->sa);
Johannes Berg46900292009-02-15 12:44:28 +01001441 return;
1442 }
1443 if (pos[1] != 0 &&
1444 (pos[1] != ifibss->ssid_len ||
Benoit Papillault0da780c2010-02-05 01:21:03 +01001445 memcmp(pos + 2, ifibss->ssid, ifibss->ssid_len))) {
Johannes Berg46900292009-02-15 12:44:28 +01001446 /* Ignore ProbeReq for foreign SSID */
1447 return;
1448 }
1449
1450 /* Reply with ProbeResp */
Johannes Bergc3ffeab2013-03-07 20:54:29 +01001451 skb = dev_alloc_skb(local->tx_headroom + presp->head_len);
Johannes Berg46900292009-02-15 12:44:28 +01001452 if (!skb)
1453 return;
1454
Johannes Bergc3ffeab2013-03-07 20:54:29 +01001455 skb_reserve(skb, local->tx_headroom);
1456 memcpy(skb_put(skb, presp->head_len), presp->head, presp->head_len);
1457
1458 memcpy(((struct ieee80211_mgmt *) skb->data)->da, mgmt->sa, ETH_ALEN);
1459 ibss_dbg(sdata, "Sending ProbeResp to %pM\n", mgmt->sa);
Johannes Berg62ae67b2009-11-18 18:42:05 +01001460 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
Simon Wunderlich691eb612014-01-24 23:48:29 +01001461
1462 /* avoid excessive retries for probe request to wildcard SSIDs */
1463 if (pos[1] == 0)
1464 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_CTL_NO_ACK;
1465
Johannes Berg62ae67b2009-11-18 18:42:05 +01001466 ieee80211_tx_skb(sdata, skb);
Johannes Berg46900292009-02-15 12:44:28 +01001467}
1468
Emmanuel Grumbachd45c4172012-12-10 16:19:13 +02001469static
1470void ieee80211_rx_mgmt_probe_beacon(struct ieee80211_sub_if_data *sdata,
1471 struct ieee80211_mgmt *mgmt, size_t len,
1472 struct ieee80211_rx_status *rx_status)
Johannes Berg46900292009-02-15 12:44:28 +01001473{
1474 size_t baselen;
1475 struct ieee802_11_elems elems;
1476
Emmanuel Grumbachd45c4172012-12-10 16:19:13 +02001477 BUILD_BUG_ON(offsetof(typeof(mgmt->u.probe_resp), variable) !=
1478 offsetof(typeof(mgmt->u.beacon), variable));
1479
1480 /*
1481 * either beacon or probe_resp but the variable field is at the
1482 * same offset
1483 */
Johannes Berg46900292009-02-15 12:44:28 +01001484 baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt;
1485 if (baselen > len)
1486 return;
1487
1488 ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen,
Johannes Bergb2e506b2013-03-26 14:54:16 +01001489 false, &elems);
Johannes Berg46900292009-02-15 12:44:28 +01001490
Emmanuel Grumbachd45c4172012-12-10 16:19:13 +02001491 ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems);
Johannes Berg46900292009-02-15 12:44:28 +01001492}
1493
Johannes Berg1fa57d02010-06-10 10:21:32 +02001494void ieee80211_ibss_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata,
1495 struct sk_buff *skb)
Johannes Berg46900292009-02-15 12:44:28 +01001496{
1497 struct ieee80211_rx_status *rx_status;
1498 struct ieee80211_mgmt *mgmt;
1499 u16 fc;
Simon Wunderlichcd7760e2013-08-28 13:41:31 +02001500 struct ieee802_11_elems elems;
1501 int ies_len;
Johannes Berg46900292009-02-15 12:44:28 +01001502
Johannes Bergf1d58c22009-06-17 13:13:00 +02001503 rx_status = IEEE80211_SKB_RXCB(skb);
Johannes Berg46900292009-02-15 12:44:28 +01001504 mgmt = (struct ieee80211_mgmt *) skb->data;
1505 fc = le16_to_cpu(mgmt->frame_control);
1506
Johannes Berg8d61ffa2013-05-10 12:32:47 +02001507 sdata_lock(sdata);
Johannes Berg7a17a332010-07-21 11:30:27 +02001508
Tim Harveyc926d002010-12-09 10:43:13 -08001509 if (!sdata->u.ibss.ssid_len)
1510 goto mgmt_out; /* not ready to merge yet */
1511
Johannes Berg46900292009-02-15 12:44:28 +01001512 switch (fc & IEEE80211_FCTL_STYPE) {
1513 case IEEE80211_STYPE_PROBE_REQ:
Johannes Bergc269a202011-02-14 12:20:22 +01001514 ieee80211_rx_mgmt_probe_req(sdata, skb);
Johannes Berg46900292009-02-15 12:44:28 +01001515 break;
1516 case IEEE80211_STYPE_PROBE_RESP:
Johannes Berg46900292009-02-15 12:44:28 +01001517 case IEEE80211_STYPE_BEACON:
Emmanuel Grumbachd45c4172012-12-10 16:19:13 +02001518 ieee80211_rx_mgmt_probe_beacon(sdata, mgmt, skb->len,
1519 rx_status);
Johannes Berg46900292009-02-15 12:44:28 +01001520 break;
1521 case IEEE80211_STYPE_AUTH:
1522 ieee80211_rx_mgmt_auth_ibss(sdata, mgmt, skb->len);
1523 break;
Antonio Quartulli2cc59e72012-09-07 13:28:53 +02001524 case IEEE80211_STYPE_DEAUTH:
1525 ieee80211_rx_mgmt_deauth_ibss(sdata, mgmt, skb->len);
1526 break;
Simon Wunderlichcd7760e2013-08-28 13:41:31 +02001527 case IEEE80211_STYPE_ACTION:
1528 switch (mgmt->u.action.category) {
1529 case WLAN_CATEGORY_SPECTRUM_MGMT:
1530 ies_len = skb->len -
1531 offsetof(struct ieee80211_mgmt,
1532 u.action.u.chan_switch.variable);
1533
1534 if (ies_len < 0)
1535 break;
1536
1537 ieee802_11_parse_elems(
1538 mgmt->u.action.u.chan_switch.variable,
1539 ies_len, true, &elems);
1540
1541 if (elems.parse_error)
1542 break;
1543
1544 ieee80211_rx_mgmt_spectrum_mgmt(sdata, mgmt, skb->len,
1545 rx_status, &elems);
1546 break;
1547 }
Johannes Berg46900292009-02-15 12:44:28 +01001548 }
Johannes Berg7a17a332010-07-21 11:30:27 +02001549
Tim Harveyc926d002010-12-09 10:43:13 -08001550 mgmt_out:
Johannes Berg8d61ffa2013-05-10 12:32:47 +02001551 sdata_unlock(sdata);
Johannes Berg46900292009-02-15 12:44:28 +01001552}
1553
Johannes Berg1fa57d02010-06-10 10:21:32 +02001554void ieee80211_ibss_work(struct ieee80211_sub_if_data *sdata)
Johannes Berg46900292009-02-15 12:44:28 +01001555{
Johannes Berg1fa57d02010-06-10 10:21:32 +02001556 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
Johannes Berg8bf11d82011-12-15 11:17:37 +01001557 struct sta_info *sta;
Johannes Berg46900292009-02-15 12:44:28 +01001558
Johannes Berg8d61ffa2013-05-10 12:32:47 +02001559 sdata_lock(sdata);
Johannes Berg7a17a332010-07-21 11:30:27 +02001560
1561 /*
1562 * Work could be scheduled after scan or similar
1563 * when we aren't even joined (or trying) with a
1564 * network.
1565 */
1566 if (!ifibss->ssid_len)
1567 goto out;
Johannes Berg46900292009-02-15 12:44:28 +01001568
Johannes Berg8bf11d82011-12-15 11:17:37 +01001569 spin_lock_bh(&ifibss->incomplete_lock);
1570 while (!list_empty(&ifibss->incomplete_stations)) {
1571 sta = list_first_entry(&ifibss->incomplete_stations,
1572 struct sta_info, list);
1573 list_del(&sta->list);
1574 spin_unlock_bh(&ifibss->incomplete_lock);
1575
Antonio Quartulli52874a52013-06-18 14:20:40 +02001576 ieee80211_ibss_finish_sta(sta);
Johannes Berg8bf11d82011-12-15 11:17:37 +01001577 rcu_read_unlock();
1578 spin_lock_bh(&ifibss->incomplete_lock);
1579 }
1580 spin_unlock_bh(&ifibss->incomplete_lock);
1581
Johannes Berg46900292009-02-15 12:44:28 +01001582 switch (ifibss->state) {
1583 case IEEE80211_IBSS_MLME_SEARCH:
1584 ieee80211_sta_find_ibss(sdata);
1585 break;
1586 case IEEE80211_IBSS_MLME_JOINED:
1587 ieee80211_sta_merge_ibss(sdata);
1588 break;
1589 default:
1590 WARN_ON(1);
1591 break;
1592 }
Johannes Berg46900292009-02-15 12:44:28 +01001593
Johannes Berg7a17a332010-07-21 11:30:27 +02001594 out:
Johannes Berg8d61ffa2013-05-10 12:32:47 +02001595 sdata_unlock(sdata);
Johannes Berg3a4d4aa2010-05-26 16:41:40 +02001596}
1597
Johannes Berg46900292009-02-15 12:44:28 +01001598static void ieee80211_ibss_timer(unsigned long data)
1599{
1600 struct ieee80211_sub_if_data *sdata =
1601 (struct ieee80211_sub_if_data *) data;
Johannes Berg46900292009-02-15 12:44:28 +01001602
Stanislaw Gruszkaa6182942013-02-28 10:55:28 +01001603 ieee80211_queue_work(&sdata->local->hw, &sdata->work);
Johannes Berg46900292009-02-15 12:44:28 +01001604}
1605
1606void ieee80211_ibss_setup_sdata(struct ieee80211_sub_if_data *sdata)
1607{
1608 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1609
Johannes Berg46900292009-02-15 12:44:28 +01001610 setup_timer(&ifibss->timer, ieee80211_ibss_timer,
1611 (unsigned long) sdata);
Johannes Berg8bf11d82011-12-15 11:17:37 +01001612 INIT_LIST_HEAD(&ifibss->incomplete_stations);
1613 spin_lock_init(&ifibss->incomplete_lock);
Simon Wunderlichcd7760e2013-08-28 13:41:31 +02001614 INIT_WORK(&ifibss->csa_connection_drop_work,
1615 ieee80211_csa_connection_drop_work);
Johannes Berg46900292009-02-15 12:44:28 +01001616}
1617
1618/* scan finished notification */
1619void ieee80211_ibss_notify_scan_completed(struct ieee80211_local *local)
1620{
Johannes Bergaf8cdcd2009-04-19 21:25:43 +02001621 struct ieee80211_sub_if_data *sdata;
Johannes Berg46900292009-02-15 12:44:28 +01001622
Johannes Berg29b4a4f2009-04-21 00:30:49 +02001623 mutex_lock(&local->iflist_mtx);
1624 list_for_each_entry(sdata, &local->interfaces, list) {
Johannes Berg9607e6b2009-12-23 13:15:31 +01001625 if (!ieee80211_sdata_running(sdata))
Johannes Berg0e41f712009-04-23 11:48:56 +02001626 continue;
Johannes Bergaf8cdcd2009-04-19 21:25:43 +02001627 if (sdata->vif.type != NL80211_IFTYPE_ADHOC)
1628 continue;
1629 sdata->u.ibss.last_scan_completed = jiffies;
Johannes Berg7a17a332010-07-21 11:30:27 +02001630 ieee80211_queue_work(&local->hw, &sdata->work);
Johannes Berg46900292009-02-15 12:44:28 +01001631 }
Johannes Berg29b4a4f2009-04-21 00:30:49 +02001632 mutex_unlock(&local->iflist_mtx);
Johannes Berg46900292009-02-15 12:44:28 +01001633}
1634
Johannes Bergaf8cdcd2009-04-19 21:25:43 +02001635int ieee80211_ibss_join(struct ieee80211_sub_if_data *sdata,
1636 struct cfg80211_ibss_params *params)
1637{
Simon Wunderlichff3cc5f2011-11-30 16:56:33 +01001638 u32 changed = 0;
Simon Wunderlich2103dec2013-07-08 16:55:53 +02001639 u32 rate_flags;
1640 struct ieee80211_supported_band *sband;
Luciano Coelho71965c12014-02-18 17:07:53 +02001641 enum ieee80211_chanctx_mode chanmode;
1642 struct ieee80211_local *local = sdata->local;
1643 int radar_detect_width = 0;
Simon Wunderlich2103dec2013-07-08 16:55:53 +02001644 int i;
Luciano Coelho71965c12014-02-18 17:07:53 +02001645 int ret;
1646
1647 ret = cfg80211_chandef_dfs_required(local->hw.wiphy,
1648 &params->chandef,
1649 sdata->wdev.iftype);
1650 if (ret < 0)
1651 return ret;
1652
1653 if (ret > 0) {
1654 if (!params->userspace_handles_dfs)
1655 return -EINVAL;
1656 radar_detect_width = BIT(params->chandef.width);
1657 }
1658
1659 chanmode = (params->channel_fixed && !ret) ?
1660 IEEE80211_CHANCTX_SHARED : IEEE80211_CHANCTX_EXCLUSIVE;
1661
1662 mutex_lock(&local->chanctx_mtx);
1663 ret = ieee80211_check_combinations(sdata, &params->chandef, chanmode,
1664 radar_detect_width);
1665 mutex_unlock(&local->chanctx_mtx);
1666 if (ret < 0)
1667 return ret;
Johannes Bergaf8cdcd2009-04-19 21:25:43 +02001668
Johannes Bergaf8cdcd2009-04-19 21:25:43 +02001669 if (params->bssid) {
1670 memcpy(sdata->u.ibss.bssid, params->bssid, ETH_ALEN);
1671 sdata->u.ibss.fixed_bssid = true;
1672 } else
1673 sdata->u.ibss.fixed_bssid = false;
1674
Johannes Bergfffd0932009-07-08 14:22:54 +02001675 sdata->u.ibss.privacy = params->privacy;
Antonio Quartulli267335d2012-01-31 20:25:47 +01001676 sdata->u.ibss.control_port = params->control_port;
Simon Wunderlich8e8d3472013-10-07 18:41:06 +02001677 sdata->u.ibss.userspace_handles_dfs = params->userspace_handles_dfs;
Teemu Paasikivifbd2c8d2010-06-14 12:55:31 +03001678 sdata->u.ibss.basic_rates = params->basic_rates;
Krzysztof HaƂasac7d37a62014-05-26 14:14:46 +02001679 sdata->u.ibss.last_scan_completed = jiffies;
Simon Wunderlich2103dec2013-07-08 16:55:53 +02001680
1681 /* fix basic_rates if channel does not support these rates */
1682 rate_flags = ieee80211_chandef_rate_flags(&params->chandef);
Luciano Coelho71965c12014-02-18 17:07:53 +02001683 sband = local->hw.wiphy->bands[params->chandef.chan->band];
Simon Wunderlich2103dec2013-07-08 16:55:53 +02001684 for (i = 0; i < sband->n_bitrates; i++) {
1685 if ((rate_flags & sband->bitrates[i].flags) != rate_flags)
1686 sdata->u.ibss.basic_rates &= ~BIT(i);
1687 }
Felix Fietkaudd5b4cc2010-11-22 20:58:24 +01001688 memcpy(sdata->vif.bss_conf.mcast_rate, params->mcast_rate,
1689 sizeof(params->mcast_rate));
Johannes Bergfffd0932009-07-08 14:22:54 +02001690
Johannes Berg57c4d7b2009-04-23 16:10:04 +02001691 sdata->vif.bss_conf.beacon_int = params->beacon_interval;
1692
Simon Wunderlich3aede782013-05-16 13:00:36 +02001693 sdata->u.ibss.chandef = params->chandef;
Johannes Bergaf8cdcd2009-04-19 21:25:43 +02001694 sdata->u.ibss.fixed_channel = params->channel_fixed;
1695
1696 if (params->ie) {
1697 sdata->u.ibss.ie = kmemdup(params->ie, params->ie_len,
1698 GFP_KERNEL);
1699 if (sdata->u.ibss.ie)
1700 sdata->u.ibss.ie_len = params->ie_len;
1701 }
1702
Johannes Bergaf8cdcd2009-04-19 21:25:43 +02001703 sdata->u.ibss.state = IEEE80211_IBSS_MLME_SEARCH;
1704 sdata->u.ibss.ibss_join_req = jiffies;
1705
Antonio Quartullibadecb02012-10-26 18:54:25 +02001706 memcpy(sdata->u.ibss.ssid, params->ssid, params->ssid_len);
Johannes Berg0e41f712009-04-23 11:48:56 +02001707 sdata->u.ibss.ssid_len = params->ssid_len;
1708
Simon Wunderlich822854b2013-06-28 10:39:59 +02001709 memcpy(&sdata->u.ibss.ht_capa, &params->ht_capa,
1710 sizeof(sdata->u.ibss.ht_capa));
1711 memcpy(&sdata->u.ibss.ht_capa_mask, &params->ht_capa_mask,
1712 sizeof(sdata->u.ibss.ht_capa_mask));
1713
Simon Wunderlichff3cc5f2011-11-30 16:56:33 +01001714 /*
1715 * 802.11n-2009 9.13.3.1: In an IBSS, the HT Protection field is
1716 * reserved, but an HT STA shall protect HT transmissions as though
1717 * the HT Protection field were set to non-HT mixed mode.
1718 *
1719 * In an IBSS, the RIFS Mode field of the HT Operation element is
1720 * also reserved, but an HT STA shall operate as though this field
1721 * were set to 1.
1722 */
1723
1724 sdata->vif.bss_conf.ht_operation_mode |=
1725 IEEE80211_HT_OP_MODE_PROTECTION_NONHT_MIXED
1726 | IEEE80211_HT_PARAM_RIFS_MODE;
1727
1728 changed |= BSS_CHANGED_HT;
1729 ieee80211_bss_info_change_notify(sdata, changed);
1730
Johannes Berg04ecd252012-09-11 14:34:12 +02001731 sdata->smps_mode = IEEE80211_SMPS_OFF;
Luciano Coelho71965c12014-02-18 17:07:53 +02001732 sdata->needed_rx_chains = local->rx_chains;
Johannes Berg04ecd252012-09-11 14:34:12 +02001733
Luciano Coelho71965c12014-02-18 17:07:53 +02001734 ieee80211_queue_work(&local->hw, &sdata->work);
Johannes Bergaf8cdcd2009-04-19 21:25:43 +02001735
1736 return 0;
1737}
1738
1739int ieee80211_ibss_leave(struct ieee80211_sub_if_data *sdata)
1740{
Teemu Paasikivi5ea096c2010-06-14 12:55:33 +03001741 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
Johannes Berg7a17a332010-07-21 11:30:27 +02001742
Simon Wunderlich871a4182013-08-28 13:41:30 +02001743 ieee80211_ibss_disconnect(sdata);
Simon Wunderlichb78a4932012-11-13 18:43:03 +01001744 ifibss->ssid_len = 0;
Simon Wunderlich871a4182013-08-28 13:41:30 +02001745 memset(ifibss->bssid, 0, ETH_ALEN);
Johannes Bergaf8cdcd2009-04-19 21:25:43 +02001746
1747 /* remove beacon */
1748 kfree(sdata->u.ibss.ie);
Simon Wunderlich822854b2013-06-28 10:39:59 +02001749
1750 /* on the next join, re-program HT parameters */
1751 memset(&ifibss->ht_capa, 0, sizeof(ifibss->ht_capa));
1752 memset(&ifibss->ht_capa_mask, 0, sizeof(ifibss->ht_capa_mask));
1753
Johannes Bergaf8cdcd2009-04-19 21:25:43 +02001754 synchronize_rcu();
Johannes Bergaf8cdcd2009-04-19 21:25:43 +02001755
Johannes Berg35f20c12010-06-10 10:21:30 +02001756 skb_queue_purge(&sdata->skb_queue);
Johannes Berg5cff20e2009-04-29 12:26:17 +02001757
Johannes Bergbc05d192010-07-21 10:52:40 +02001758 del_timer_sync(&sdata->u.ibss.timer);
Johannes Berg7a17a332010-07-21 11:30:27 +02001759
Johannes Bergaf8cdcd2009-04-19 21:25:43 +02001760 return 0;
1761}