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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
Sara Sharond321cd02016-01-25 15:46:35 +020010 * Copyright(c) 2016 Intel Deutschland GmbH
Johannes Berg46900292009-02-15 12:44:28 +010011 *
12 * This program is free software; you can redistribute it and/or modify
13 * it under the terms of the GNU General Public License version 2 as
14 * published by the Free Software Foundation.
15 */
16
17#include <linux/delay.h>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090018#include <linux/slab.h>
Johannes Berg46900292009-02-15 12:44:28 +010019#include <linux/if_ether.h>
20#include <linux/skbuff.h>
21#include <linux/if_arp.h>
22#include <linux/etherdevice.h>
23#include <linux/rtnetlink.h>
24#include <net/mac80211.h>
Johannes Berg46900292009-02-15 12:44:28 +010025
26#include "ieee80211_i.h"
Johannes Berg24487982009-04-23 18:52:52 +020027#include "driver-ops.h"
Johannes Berg46900292009-02-15 12:44:28 +010028#include "rate.h"
29
30#define IEEE80211_SCAN_INTERVAL (2 * HZ)
Johannes Berg46900292009-02-15 12:44:28 +010031#define IEEE80211_IBSS_JOIN_TIMEOUT (7 * HZ)
32
33#define IEEE80211_IBSS_MERGE_INTERVAL (30 * HZ)
34#define IEEE80211_IBSS_INACTIVITY_LIMIT (60 * HZ)
Antonio Quartullidad9def2013-07-26 21:15:02 +020035#define IEEE80211_IBSS_RSN_INACTIVITY_LIMIT (10 * HZ)
Johannes Berg46900292009-02-15 12:44:28 +010036
37#define IEEE80211_IBSS_MAX_STA_ENTRIES 128
38
Simon Wunderlichd51b70f2013-08-09 16:35:17 +020039static struct beacon_data *
40ieee80211_ibss_build_presp(struct ieee80211_sub_if_data *sdata,
41 const int beacon_int, const u32 basic_rates,
42 const u16 capability, u64 tsf,
43 struct cfg80211_chan_def *chandef,
Simon Wunderlichcd7760e2013-08-28 13:41:31 +020044 bool *have_higher_than_11mbit,
45 struct cfg80211_csa_settings *csa_settings)
Simon Wunderlichd51b70f2013-08-09 16:35:17 +020046{
47 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
48 struct ieee80211_local *local = sdata->local;
49 int rates_n = 0, i, ri;
50 struct ieee80211_mgmt *mgmt;
51 u8 *pos;
52 struct ieee80211_supported_band *sband;
53 u32 rate_flags, rates = 0, rates_added = 0;
54 struct beacon_data *presp;
55 int frame_len;
56 int shift;
57
58 /* Build IBSS probe response */
59 frame_len = sizeof(struct ieee80211_hdr_3addr) +
60 12 /* struct ieee80211_mgmt.u.beacon */ +
61 2 + IEEE80211_MAX_SSID_LEN /* max SSID */ +
62 2 + 8 /* max Supported Rates */ +
63 3 /* max DS params */ +
64 4 /* IBSS params */ +
Simon Wunderlichcd7760e2013-08-28 13:41:31 +020065 5 /* Channel Switch Announcement */ +
Simon Wunderlichd51b70f2013-08-09 16:35:17 +020066 2 + (IEEE80211_MAX_SUPP_RATES - 8) +
67 2 + sizeof(struct ieee80211_ht_cap) +
68 2 + sizeof(struct ieee80211_ht_operation) +
69 ifibss->ie_len;
70 presp = kzalloc(sizeof(*presp) + frame_len, GFP_KERNEL);
71 if (!presp)
72 return NULL;
73
74 presp->head = (void *)(presp + 1);
75
76 mgmt = (void *) presp->head;
77 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
78 IEEE80211_STYPE_PROBE_RESP);
79 eth_broadcast_addr(mgmt->da);
80 memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
81 memcpy(mgmt->bssid, ifibss->bssid, ETH_ALEN);
82 mgmt->u.beacon.beacon_int = cpu_to_le16(beacon_int);
83 mgmt->u.beacon.timestamp = cpu_to_le64(tsf);
84 mgmt->u.beacon.capab_info = cpu_to_le16(capability);
85
86 pos = (u8 *)mgmt + offsetof(struct ieee80211_mgmt, u.beacon.variable);
87
88 *pos++ = WLAN_EID_SSID;
89 *pos++ = ifibss->ssid_len;
90 memcpy(pos, ifibss->ssid, ifibss->ssid_len);
91 pos += ifibss->ssid_len;
92
93 sband = local->hw.wiphy->bands[chandef->chan->band];
94 rate_flags = ieee80211_chandef_rate_flags(chandef);
95 shift = ieee80211_chandef_get_shift(chandef);
96 rates_n = 0;
97 if (have_higher_than_11mbit)
98 *have_higher_than_11mbit = false;
99
100 for (i = 0; i < sband->n_bitrates; i++) {
101 if ((rate_flags & sband->bitrates[i].flags) != rate_flags)
102 continue;
103 if (sband->bitrates[i].bitrate > 110 &&
104 have_higher_than_11mbit)
105 *have_higher_than_11mbit = true;
106
107 rates |= BIT(i);
108 rates_n++;
109 }
110
111 *pos++ = WLAN_EID_SUPP_RATES;
112 *pos++ = min_t(int, 8, rates_n);
113 for (ri = 0; ri < sband->n_bitrates; ri++) {
114 int rate = DIV_ROUND_UP(sband->bitrates[ri].bitrate,
115 5 * (1 << shift));
116 u8 basic = 0;
117 if (!(rates & BIT(ri)))
118 continue;
119
120 if (basic_rates & BIT(ri))
121 basic = 0x80;
122 *pos++ = basic | (u8) rate;
123 if (++rates_added == 8) {
124 ri++; /* continue at next rate for EXT_SUPP_RATES */
125 break;
126 }
127 }
128
129 if (sband->band == IEEE80211_BAND_2GHZ) {
130 *pos++ = WLAN_EID_DS_PARAMS;
131 *pos++ = 1;
132 *pos++ = ieee80211_frequency_to_channel(
133 chandef->chan->center_freq);
134 }
135
136 *pos++ = WLAN_EID_IBSS_PARAMS;
137 *pos++ = 2;
138 /* FIX: set ATIM window based on scan results */
139 *pos++ = 0;
140 *pos++ = 0;
141
Simon Wunderlichcd7760e2013-08-28 13:41:31 +0200142 if (csa_settings) {
143 *pos++ = WLAN_EID_CHANNEL_SWITCH;
144 *pos++ = 3;
145 *pos++ = csa_settings->block_tx ? 1 : 0;
146 *pos++ = ieee80211_frequency_to_channel(
147 csa_settings->chandef.chan->center_freq);
Michal Kazioraf296bd2014-06-05 14:21:36 +0200148 presp->csa_counter_offsets[0] = (pos - presp->head);
Simon Wunderlichcd7760e2013-08-28 13:41:31 +0200149 *pos++ = csa_settings->count;
Chun-Yeow Yeoh8df734e2015-06-09 13:35:33 +0800150 presp->csa_current_counter = csa_settings->count;
Simon Wunderlichcd7760e2013-08-28 13:41:31 +0200151 }
152
Simon Wunderlichd51b70f2013-08-09 16:35:17 +0200153 /* put the remaining rates in WLAN_EID_EXT_SUPP_RATES */
154 if (rates_n > 8) {
155 *pos++ = WLAN_EID_EXT_SUPP_RATES;
156 *pos++ = rates_n - 8;
157 for (; ri < sband->n_bitrates; ri++) {
158 int rate = DIV_ROUND_UP(sband->bitrates[ri].bitrate,
159 5 * (1 << shift));
160 u8 basic = 0;
161 if (!(rates & BIT(ri)))
162 continue;
163
164 if (basic_rates & BIT(ri))
165 basic = 0x80;
166 *pos++ = basic | (u8) rate;
167 }
168 }
169
170 if (ifibss->ie_len) {
171 memcpy(pos, ifibss->ie, ifibss->ie_len);
172 pos += ifibss->ie_len;
173 }
174
175 /* add HT capability and information IEs */
176 if (chandef->width != NL80211_CHAN_WIDTH_20_NOHT &&
177 chandef->width != NL80211_CHAN_WIDTH_5 &&
178 chandef->width != NL80211_CHAN_WIDTH_10 &&
179 sband->ht_cap.ht_supported) {
180 struct ieee80211_sta_ht_cap ht_cap;
181
182 memcpy(&ht_cap, &sband->ht_cap, sizeof(ht_cap));
183 ieee80211_apply_htcap_overrides(sdata, &ht_cap);
184
185 pos = ieee80211_ie_build_ht_cap(pos, &ht_cap, ht_cap.cap);
186 /*
187 * Note: According to 802.11n-2009 9.13.3.1, HT Protection
188 * field and RIFS Mode are reserved in IBSS mode, therefore
189 * keep them at 0
190 */
191 pos = ieee80211_ie_build_ht_oper(pos, &sband->ht_cap,
Arik Nemtsov57f255f2015-10-25 10:59:34 +0200192 chandef, 0, false);
Janusz.Dziedzic@tieto.comabcff6e2015-03-20 06:37:01 +0100193
194 /* add VHT capability and information IEs */
195 if (chandef->width != NL80211_CHAN_WIDTH_20 &&
196 chandef->width != NL80211_CHAN_WIDTH_40 &&
197 sband->vht_cap.vht_supported) {
198 pos = ieee80211_ie_build_vht_cap(pos, &sband->vht_cap,
199 sband->vht_cap.cap);
200 pos = ieee80211_ie_build_vht_oper(pos, &sband->vht_cap,
201 chandef);
202 }
Simon Wunderlichd51b70f2013-08-09 16:35:17 +0200203 }
204
Arik Nemtsov40b861a2014-07-17 17:14:23 +0300205 if (local->hw.queues >= IEEE80211_NUM_ACS)
206 pos = ieee80211_add_wmm_info_ie(pos, 0); /* U-APSD not in use */
Simon Wunderlichd51b70f2013-08-09 16:35:17 +0200207
208 presp->head_len = pos - presp->head;
209 if (WARN_ON(presp->head_len > frame_len))
210 goto error;
211
212 return presp;
213error:
214 kfree(presp);
215 return NULL;
216}
Johannes Berg46900292009-02-15 12:44:28 +0100217
Johannes Bergaf8cdcd2009-04-19 21:25:43 +0200218static void __ieee80211_sta_join_ibss(struct ieee80211_sub_if_data *sdata,
219 const u8 *bssid, const int beacon_int,
Simon Wunderlich75a423f2013-08-21 15:30:25 +0200220 struct cfg80211_chan_def *req_chandef,
Johannes Bergb59066a2009-05-12 21:18:38 +0200221 const u32 basic_rates,
Sujith Manoharanc13a7652012-10-12 17:35:45 +0530222 const u16 capability, u64 tsf,
223 bool creator)
Johannes Berg46900292009-02-15 12:44:28 +0100224{
225 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
226 struct ieee80211_local *local = sdata->local;
Simon Wunderlichd51b70f2013-08-09 16:35:17 +0200227 struct ieee80211_mgmt *mgmt;
Johannes Bergf446d102009-10-28 15:12:32 +0100228 struct cfg80211_bss *bss;
Simon Wunderlichd51b70f2013-08-09 16:35:17 +0200229 u32 bss_change;
Johannes Berg683b6d32012-11-08 21:25:48 +0100230 struct cfg80211_chan_def chandef;
Simon Wunderlich75a423f2013-08-21 15:30:25 +0200231 struct ieee80211_channel *chan;
Johannes Bergc3ffeab2013-03-07 20:54:29 +0100232 struct beacon_data *presp;
Johannes Berg61f6bba2015-10-13 11:36:21 +0200233 struct cfg80211_inform_bss bss_meta = {};
Simon Wunderlichd51b70f2013-08-09 16:35:17 +0200234 bool have_higher_than_11mbit;
Luciano Coelho2beb6dab2014-02-18 11:40:36 +0200235 bool radar_required;
Johannes Berg55fff502013-08-19 18:48:41 +0200236 int err;
Johannes Berg24487982009-04-23 18:52:52 +0200237
Johannes Berg8d61ffa2013-05-10 12:32:47 +0200238 sdata_assert_lock(sdata);
Johannes Berg7a17a332010-07-21 11:30:27 +0200239
Johannes Berg24487982009-04-23 18:52:52 +0200240 /* Reset own TSF to allow time synchronization work. */
Eliad Peller37a41b42011-09-21 14:06:11 +0300241 drv_reset_tsf(local, sdata);
Johannes Berg46900292009-02-15 12:44:28 +0100242
Joe Perchesb203ca32012-05-08 18:56:52 +0000243 if (!ether_addr_equal(ifibss->bssid, bssid))
Johannes Bergb998e8b2012-12-13 23:07:46 +0100244 sta_info_flush(sdata);
Johannes Berg46900292009-02-15 12:44:28 +0100245
Johannes Berg49b5c7f2010-04-29 21:34:01 +0200246 /* if merging, indicate to driver that we leave the old IBSS */
247 if (sdata->vif.bss_conf.ibss_joined) {
248 sdata->vif.bss_conf.ibss_joined = false;
Sujith Manoharanc13a7652012-10-12 17:35:45 +0530249 sdata->vif.bss_conf.ibss_creator = false;
Johannes Berg1852d402013-03-07 20:22:28 +0100250 sdata->vif.bss_conf.enable_beacon = false;
Eliad Peller86a2ea42011-11-08 15:36:59 +0200251 netif_carrier_off(sdata->dev);
Johannes Berg1852d402013-03-07 20:22:28 +0100252 ieee80211_bss_info_change_notify(sdata,
253 BSS_CHANGED_IBSS |
254 BSS_CHANGED_BEACON_ENABLED);
Johannes Berg55fff502013-08-19 18:48:41 +0200255 drv_leave_ibss(local, sdata);
Johannes Berg49b5c7f2010-04-29 21:34:01 +0200256 }
257
Johannes Bergc3ffeab2013-03-07 20:54:29 +0100258 presp = rcu_dereference_protected(ifibss->presp,
Johannes Berg8d61ffa2013-05-10 12:32:47 +0200259 lockdep_is_held(&sdata->wdev.mtx));
Monam Agarwal0c2bef462014-03-24 00:51:43 +0530260 RCU_INIT_POINTER(ifibss->presp, NULL);
Johannes Bergc3ffeab2013-03-07 20:54:29 +0100261 if (presp)
262 kfree_rcu(presp, rcu_head);
Johannes Berg1852d402013-03-07 20:22:28 +0100263
Simon Wunderlich75a423f2013-08-21 15:30:25 +0200264 /* make a copy of the chandef, it could be modified below. */
265 chandef = *req_chandef;
266 chan = chandef.chan;
Ilan Peer174e0cd2014-02-23 09:13:01 +0200267 if (!cfg80211_reg_can_beacon(local->hw.wiphy, &chandef,
268 NL80211_IFTYPE_ADHOC)) {
Simon Wunderlich4b42aab2013-07-08 16:55:57 +0200269 if (chandef.width == NL80211_CHAN_WIDTH_5 ||
270 chandef.width == NL80211_CHAN_WIDTH_10 ||
271 chandef.width == NL80211_CHAN_WIDTH_20_NOHT ||
272 chandef.width == NL80211_CHAN_WIDTH_20) {
273 sdata_info(sdata,
274 "Failed to join IBSS, beacons forbidden\n");
275 return;
276 }
Johannes Berg4bf88532012-11-09 11:39:59 +0100277 chandef.width = NL80211_CHAN_WIDTH_20;
278 chandef.center_freq1 = chan->center_freq;
Simon Wunderlich8e8d3472013-10-07 18:41:06 +0200279 /* check again for downgraded chandef */
Ilan Peer174e0cd2014-02-23 09:13:01 +0200280 if (!cfg80211_reg_can_beacon(local->hw.wiphy, &chandef,
281 NL80211_IFTYPE_ADHOC)) {
Simon Wunderlich8e8d3472013-10-07 18:41:06 +0200282 sdata_info(sdata,
283 "Failed to join IBSS, beacons forbidden\n");
284 return;
285 }
286 }
287
288 err = cfg80211_chandef_dfs_required(sdata->local->hw.wiphy,
Luciano Coelho2beb6dab2014-02-18 11:40:36 +0200289 &chandef, NL80211_IFTYPE_ADHOC);
Luciano Coelho6658ab82014-02-20 16:36:23 +0200290 if (err < 0) {
291 sdata_info(sdata,
292 "Failed to join IBSS, invalid chandef\n");
293 return;
294 }
Luciano Coelho2beb6dab2014-02-18 11:40:36 +0200295 if (err > 0 && !ifibss->userspace_handles_dfs) {
296 sdata_info(sdata,
297 "Failed to join IBSS, DFS channel without control program\n");
298 return;
Johannes Berg4bf88532012-11-09 11:39:59 +0100299 }
Johannes Berg55de9082012-07-26 17:24:39 +0200300
Luciano Coelho2beb6dab2014-02-18 11:40:36 +0200301 radar_required = err;
302
Johannes Berg34a37402013-12-18 09:43:33 +0100303 mutex_lock(&local->mtx);
Johannes Berg4bf88532012-11-09 11:39:59 +0100304 if (ieee80211_vif_use_channel(sdata, &chandef,
Johannes Berg55de9082012-07-26 17:24:39 +0200305 ifibss->fixed_channel ?
306 IEEE80211_CHANCTX_SHARED :
307 IEEE80211_CHANCTX_EXCLUSIVE)) {
308 sdata_info(sdata, "Failed to join IBSS, no channel context\n");
Johannes Berg34a37402013-12-18 09:43:33 +0100309 mutex_unlock(&local->mtx);
Johannes Berg55de9082012-07-26 17:24:39 +0200310 return;
Alexander Simon13c40c52011-11-30 16:56:34 +0100311 }
Michal Kaziorcc901de2014-01-29 07:56:20 +0100312 sdata->radar_required = radar_required;
Johannes Berg34a37402013-12-18 09:43:33 +0100313 mutex_unlock(&local->mtx);
Johannes Berg55de9082012-07-26 17:24:39 +0200314
315 memcpy(ifibss->bssid, bssid, ETH_ALEN);
Johannes Berg57c4d7b2009-04-23 16:10:04 +0200316
Simon Wunderlichd51b70f2013-08-09 16:35:17 +0200317 presp = ieee80211_ibss_build_presp(sdata, beacon_int, basic_rates,
318 capability, tsf, &chandef,
Simon Wunderlichcd7760e2013-08-28 13:41:31 +0200319 &have_higher_than_11mbit, NULL);
Johannes Bergc3ffeab2013-03-07 20:54:29 +0100320 if (!presp)
321 return;
322
Johannes Bergc3ffeab2013-03-07 20:54:29 +0100323 rcu_assign_pointer(ifibss->presp, presp);
Simon Wunderlichd51b70f2013-08-09 16:35:17 +0200324 mgmt = (void *)presp->head;
Johannes Berg46900292009-02-15 12:44:28 +0100325
Johannes Bergd6a83222012-12-14 14:06:28 +0100326 sdata->vif.bss_conf.enable_beacon = true;
Johannes Berg2d0ddec2009-04-23 16:13:26 +0200327 sdata->vif.bss_conf.beacon_int = beacon_int;
Teemu Paasikivifbd2c8d2010-06-14 12:55:31 +0300328 sdata->vif.bss_conf.basic_rates = basic_rates;
Marek Puzyniak0ca54f62013-04-10 13:19:13 +0200329 sdata->vif.bss_conf.ssid_len = ifibss->ssid_len;
330 memcpy(sdata->vif.bss_conf.ssid, ifibss->ssid, ifibss->ssid_len);
Johannes Berg2d0ddec2009-04-23 16:13:26 +0200331 bss_change = BSS_CHANGED_BEACON_INT;
332 bss_change |= ieee80211_reset_erp_info(sdata);
333 bss_change |= BSS_CHANGED_BSSID;
334 bss_change |= BSS_CHANGED_BEACON;
335 bss_change |= BSS_CHANGED_BEACON_ENABLED;
Teemu Paasikivi392cfdb2010-06-14 12:55:32 +0300336 bss_change |= BSS_CHANGED_BASIC_RATES;
Alexander Simon13c40c52011-11-30 16:56:34 +0100337 bss_change |= BSS_CHANGED_HT;
Johannes Berg8fc214b2010-04-28 17:40:43 +0200338 bss_change |= BSS_CHANGED_IBSS;
Marek Puzyniak0ca54f62013-04-10 13:19:13 +0200339 bss_change |= BSS_CHANGED_SSID;
Simon Wunderlich2f91a962012-12-03 22:21:30 +0100340
341 /*
342 * In 5 GHz/802.11a, we can always use short slot time.
343 * (IEEE 802.11-2012 18.3.8.7)
344 *
345 * In 2.4GHz, we must always use long slots in IBSS for compatibility
346 * reasons.
347 * (IEEE 802.11-2012 19.4.5)
348 *
349 * HT follows these specifications (IEEE 802.11-2012 20.3.18)
350 */
351 sdata->vif.bss_conf.use_short_slot = chan->band == IEEE80211_BAND_5GHZ;
352 bss_change |= BSS_CHANGED_ERP_SLOT;
353
Simon Wunderlich2ec9c1f2013-07-11 18:07:46 +0200354 /* cf. IEEE 802.11 9.2.12 */
355 if (chan->band == IEEE80211_BAND_2GHZ && have_higher_than_11mbit)
356 sdata->flags |= IEEE80211_SDATA_OPERATING_GMODE;
357 else
358 sdata->flags &= ~IEEE80211_SDATA_OPERATING_GMODE;
359
Johannes Bergcec66282015-10-22 17:46:04 +0200360 ieee80211_set_wmm_default(sdata, true, false);
Johannes Berg55fff502013-08-19 18:48:41 +0200361
Johannes Berg8fc214b2010-04-28 17:40:43 +0200362 sdata->vif.bss_conf.ibss_joined = true;
Sujith Manoharanc13a7652012-10-12 17:35:45 +0530363 sdata->vif.bss_conf.ibss_creator = creator;
Johannes Berg46900292009-02-15 12:44:28 +0100364
Johannes Berg55fff502013-08-19 18:48:41 +0200365 err = drv_join_ibss(local, sdata);
366 if (err) {
367 sdata->vif.bss_conf.ibss_joined = false;
368 sdata->vif.bss_conf.ibss_creator = false;
369 sdata->vif.bss_conf.enable_beacon = false;
370 sdata->vif.bss_conf.ssid_len = 0;
371 RCU_INIT_POINTER(ifibss->presp, NULL);
372 kfree_rcu(presp, rcu_head);
Johannes Berg34a37402013-12-18 09:43:33 +0100373 mutex_lock(&local->mtx);
Johannes Berg55fff502013-08-19 18:48:41 +0200374 ieee80211_vif_release_channel(sdata);
Johannes Berg34a37402013-12-18 09:43:33 +0100375 mutex_unlock(&local->mtx);
Johannes Berg55fff502013-08-19 18:48:41 +0200376 sdata_info(sdata, "Failed to join IBSS, driver failure: %d\n",
377 err);
378 return;
379 }
380
381 ieee80211_bss_info_change_notify(sdata, bss_change);
Johannes Berg46900292009-02-15 12:44:28 +0100382
Johannes Berg46900292009-02-15 12:44:28 +0100383 ifibss->state = IEEE80211_IBSS_MLME_JOINED;
Johannes Bergaf8cdcd2009-04-19 21:25:43 +0200384 mod_timer(&ifibss->timer,
385 round_jiffies(jiffies + IEEE80211_IBSS_MERGE_INTERVAL));
Johannes Berg46900292009-02-15 12:44:28 +0100386
Johannes Berg61f6bba2015-10-13 11:36:21 +0200387 bss_meta.chan = chan;
388 bss_meta.scan_width = cfg80211_chandef_to_scan_width(&chandef);
389 bss = cfg80211_inform_bss_frame_data(local->hw.wiphy, &bss_meta, mgmt,
390 presp->head_len, GFP_KERNEL);
391
Johannes Berg5b112d32013-02-01 01:49:58 +0100392 cfg80211_put_bss(local->hw.wiphy, bss);
Eliad Peller86a2ea42011-11-08 15:36:59 +0200393 netif_carrier_on(sdata->dev);
Antonio Quartullife94f3a2014-01-29 17:53:43 +0100394 cfg80211_ibss_joined(sdata->dev, ifibss->bssid, chan, GFP_KERNEL);
Johannes Berg46900292009-02-15 12:44:28 +0100395}
396
Johannes Bergaf8cdcd2009-04-19 21:25:43 +0200397static void ieee80211_sta_join_ibss(struct ieee80211_sub_if_data *sdata,
398 struct ieee80211_bss *bss)
Johannes Berg46900292009-02-15 12:44:28 +0100399{
Johannes Berg0c1ad2c2009-12-23 13:15:39 +0100400 struct cfg80211_bss *cbss =
401 container_of((void *)bss, struct cfg80211_bss, priv);
Johannes Bergb59066a2009-05-12 21:18:38 +0200402 struct ieee80211_supported_band *sband;
Simon Wunderlich75a423f2013-08-21 15:30:25 +0200403 struct cfg80211_chan_def chandef;
Johannes Bergb59066a2009-05-12 21:18:38 +0200404 u32 basic_rates;
405 int i, j;
Johannes Berg0c1ad2c2009-12-23 13:15:39 +0100406 u16 beacon_int = cbss->beacon_interval;
Johannes Berg8cef2c92013-02-05 16:54:31 +0100407 const struct cfg80211_bss_ies *ies;
Simon Wunderlich75a423f2013-08-21 15:30:25 +0200408 enum nl80211_channel_type chan_type;
Johannes Berg8cef2c92013-02-05 16:54:31 +0100409 u64 tsf;
Simon Wunderlich2103dec2013-07-08 16:55:53 +0200410 u32 rate_flags;
411 int shift;
Johannes Berg57c4d7b2009-04-23 16:10:04 +0200412
Johannes Berg8d61ffa2013-05-10 12:32:47 +0200413 sdata_assert_lock(sdata);
Johannes Berg7a17a332010-07-21 11:30:27 +0200414
Johannes Berg57c4d7b2009-04-23 16:10:04 +0200415 if (beacon_int < 10)
416 beacon_int = 10;
417
Simon Wunderlich75a423f2013-08-21 15:30:25 +0200418 switch (sdata->u.ibss.chandef.width) {
419 case NL80211_CHAN_WIDTH_20_NOHT:
420 case NL80211_CHAN_WIDTH_20:
421 case NL80211_CHAN_WIDTH_40:
422 chan_type = cfg80211_get_chandef_type(&sdata->u.ibss.chandef);
423 cfg80211_chandef_create(&chandef, cbss->channel, chan_type);
424 break;
425 case NL80211_CHAN_WIDTH_5:
426 case NL80211_CHAN_WIDTH_10:
427 cfg80211_chandef_create(&chandef, cbss->channel,
428 NL80211_CHAN_WIDTH_20_NOHT);
429 chandef.width = sdata->u.ibss.chandef.width;
430 break;
Janusz.Dziedzic@tieto.comabcff6e2015-03-20 06:37:01 +0100431 case NL80211_CHAN_WIDTH_80:
Jouni Malinenc39b3362015-11-26 20:49:38 +0200432 case NL80211_CHAN_WIDTH_80P80:
Janusz.Dziedzic@tieto.comabcff6e2015-03-20 06:37:01 +0100433 case NL80211_CHAN_WIDTH_160:
434 chandef = sdata->u.ibss.chandef;
435 chandef.chan = cbss->channel;
436 break;
Simon Wunderlich75a423f2013-08-21 15:30:25 +0200437 default:
438 /* fall back to 20 MHz for unsupported modes */
439 cfg80211_chandef_create(&chandef, cbss->channel,
440 NL80211_CHAN_WIDTH_20_NOHT);
441 break;
442 }
443
Johannes Berg0c1ad2c2009-12-23 13:15:39 +0100444 sband = sdata->local->hw.wiphy->bands[cbss->channel->band];
Simon Wunderlich2103dec2013-07-08 16:55:53 +0200445 rate_flags = ieee80211_chandef_rate_flags(&sdata->u.ibss.chandef);
446 shift = ieee80211_vif_get_shift(&sdata->vif);
Johannes Bergb59066a2009-05-12 21:18:38 +0200447
448 basic_rates = 0;
449
450 for (i = 0; i < bss->supp_rates_len; i++) {
Simon Wunderlich2103dec2013-07-08 16:55:53 +0200451 int rate = bss->supp_rates[i] & 0x7f;
Johannes Bergb59066a2009-05-12 21:18:38 +0200452 bool is_basic = !!(bss->supp_rates[i] & 0x80);
453
454 for (j = 0; j < sband->n_bitrates; j++) {
Simon Wunderlich2103dec2013-07-08 16:55:53 +0200455 int brate;
456 if ((rate_flags & sband->bitrates[j].flags)
457 != rate_flags)
458 continue;
459
460 brate = DIV_ROUND_UP(sband->bitrates[j].bitrate,
461 5 * (1 << shift));
462 if (brate == rate) {
Johannes Bergb59066a2009-05-12 21:18:38 +0200463 if (is_basic)
464 basic_rates |= BIT(j);
465 break;
466 }
467 }
468 }
469
Johannes Berg8cef2c92013-02-05 16:54:31 +0100470 rcu_read_lock();
471 ies = rcu_dereference(cbss->ies);
472 tsf = ies->tsf;
473 rcu_read_unlock();
474
Johannes Berg0c1ad2c2009-12-23 13:15:39 +0100475 __ieee80211_sta_join_ibss(sdata, cbss->bssid,
Johannes Berg57c4d7b2009-04-23 16:10:04 +0200476 beacon_int,
Simon Wunderlich75a423f2013-08-21 15:30:25 +0200477 &chandef,
Johannes Bergb59066a2009-05-12 21:18:38 +0200478 basic_rates,
Johannes Berg0c1ad2c2009-12-23 13:15:39 +0100479 cbss->capability,
Johannes Berg8cef2c92013-02-05 16:54:31 +0100480 tsf, false);
Johannes Berg46900292009-02-15 12:44:28 +0100481}
482
Simon Wunderlichcd7760e2013-08-28 13:41:31 +0200483int ieee80211_ibss_csa_beacon(struct ieee80211_sub_if_data *sdata,
484 struct cfg80211_csa_settings *csa_settings)
485{
486 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
487 struct beacon_data *presp, *old_presp;
488 struct cfg80211_bss *cbss;
489 const struct cfg80211_bss_ies *ies;
Dedy Lansky6eb18132015-02-08 15:52:03 +0200490 u16 capability = 0;
Simon Wunderlichcd7760e2013-08-28 13:41:31 +0200491 u64 tsf;
492 int ret = 0;
493
494 sdata_assert_lock(sdata);
495
Simon Wunderlichcd7760e2013-08-28 13:41:31 +0200496 if (ifibss->privacy)
Dedy Lansky6eb18132015-02-08 15:52:03 +0200497 capability = WLAN_CAPABILITY_PRIVACY;
Simon Wunderlichcd7760e2013-08-28 13:41:31 +0200498
499 cbss = cfg80211_get_bss(sdata->local->hw.wiphy, ifibss->chandef.chan,
500 ifibss->bssid, ifibss->ssid,
Dedy Lansky6eb18132015-02-08 15:52:03 +0200501 ifibss->ssid_len, IEEE80211_BSS_TYPE_IBSS,
502 IEEE80211_PRIVACY(ifibss->privacy));
Simon Wunderlichcd7760e2013-08-28 13:41:31 +0200503
504 if (WARN_ON(!cbss)) {
505 ret = -EINVAL;
506 goto out;
507 }
508
509 rcu_read_lock();
510 ies = rcu_dereference(cbss->ies);
511 tsf = ies->tsf;
512 rcu_read_unlock();
513 cfg80211_put_bss(sdata->local->hw.wiphy, cbss);
514
515 old_presp = rcu_dereference_protected(ifibss->presp,
516 lockdep_is_held(&sdata->wdev.mtx));
517
518 presp = ieee80211_ibss_build_presp(sdata,
519 sdata->vif.bss_conf.beacon_int,
520 sdata->vif.bss_conf.basic_rates,
521 capability, tsf, &ifibss->chandef,
522 NULL, csa_settings);
523 if (!presp) {
524 ret = -ENOMEM;
525 goto out;
526 }
527
528 rcu_assign_pointer(ifibss->presp, presp);
529 if (old_presp)
530 kfree_rcu(old_presp, rcu_head);
531
Luciano Coelhodddd5862013-12-13 21:13:51 +0200532 return BSS_CHANGED_BEACON;
Simon Wunderlichcd7760e2013-08-28 13:41:31 +0200533 out:
534 return ret;
535}
536
537int ieee80211_ibss_finish_csa(struct ieee80211_sub_if_data *sdata)
538{
539 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
540 struct cfg80211_bss *cbss;
Michal Kaziorfaf046e2014-01-29 07:56:17 +0100541 int err, changed = 0;
Simon Wunderlichcd7760e2013-08-28 13:41:31 +0200542
Simon Wunderlichbafdc612013-12-05 19:54:43 +0100543 sdata_assert_lock(sdata);
544
Simon Wunderlichcd7760e2013-08-28 13:41:31 +0200545 /* update cfg80211 bss information with the new channel */
546 if (!is_zero_ether_addr(ifibss->bssid)) {
Simon Wunderlichcd7760e2013-08-28 13:41:31 +0200547 cbss = cfg80211_get_bss(sdata->local->hw.wiphy,
548 ifibss->chandef.chan,
549 ifibss->bssid, ifibss->ssid,
Dedy Lansky6eb18132015-02-08 15:52:03 +0200550 ifibss->ssid_len,
551 IEEE80211_BSS_TYPE_IBSS,
552 IEEE80211_PRIVACY(ifibss->privacy));
Simon Wunderlichcd7760e2013-08-28 13:41:31 +0200553 /* XXX: should not really modify cfg80211 data */
554 if (cbss) {
Luciano Coelho33787fc2013-11-11 20:34:54 +0200555 cbss->channel = sdata->csa_chandef.chan;
Simon Wunderlichcd7760e2013-08-28 13:41:31 +0200556 cfg80211_put_bss(sdata->local->hw.wiphy, cbss);
557 }
558 }
559
Luciano Coelho33787fc2013-11-11 20:34:54 +0200560 ifibss->chandef = sdata->csa_chandef;
Simon Wunderlichcd7760e2013-08-28 13:41:31 +0200561
562 /* generate the beacon */
563 err = ieee80211_ibss_csa_beacon(sdata, NULL);
Simon Wunderlichcd7760e2013-08-28 13:41:31 +0200564 if (err < 0)
565 return err;
566
Michal Kaziorfaf046e2014-01-29 07:56:17 +0100567 changed |= err;
Luciano Coelhodddd5862013-12-13 21:13:51 +0200568
Michal Kaziorfaf046e2014-01-29 07:56:17 +0100569 return changed;
Simon Wunderlichcd7760e2013-08-28 13:41:31 +0200570}
571
572void ieee80211_ibss_stop(struct ieee80211_sub_if_data *sdata)
573{
574 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
575
576 cancel_work_sync(&ifibss->csa_connection_drop_work);
577}
578
Antonio Quartulli52874a52013-06-18 14:20:40 +0200579static struct sta_info *ieee80211_ibss_finish_sta(struct sta_info *sta)
Johannes Berg8bf11d82011-12-15 11:17:37 +0100580 __acquires(RCU)
581{
582 struct ieee80211_sub_if_data *sdata = sta->sdata;
583 u8 addr[ETH_ALEN];
584
585 memcpy(addr, sta->sta.addr, ETH_ALEN);
586
Johannes Bergbdcbd8e2012-06-22 11:29:50 +0200587 ibss_dbg(sdata, "Adding new IBSS station %pM\n", addr);
Johannes Berg8bf11d82011-12-15 11:17:37 +0100588
Johannes Berg83d5cc02012-01-12 09:31:10 +0100589 sta_info_pre_move_state(sta, IEEE80211_STA_AUTH);
590 sta_info_pre_move_state(sta, IEEE80211_STA_ASSOC);
Antonio Quartulli267335d2012-01-31 20:25:47 +0100591 /* authorize the station only if the network is not RSN protected. If
592 * not wait for the userspace to authorize it */
593 if (!sta->sdata->u.ibss.control_port)
594 sta_info_pre_move_state(sta, IEEE80211_STA_AUTHORIZED);
Johannes Berg8bf11d82011-12-15 11:17:37 +0100595
596 rate_control_rate_init(sta);
597
598 /* If it fails, maybe we raced another insertion? */
599 if (sta_info_insert_rcu(sta))
600 return sta_info_get(sdata, addr);
601 return sta;
602}
603
604static struct sta_info *
Antonio Quartulli52874a52013-06-18 14:20:40 +0200605ieee80211_ibss_add_sta(struct ieee80211_sub_if_data *sdata, const u8 *bssid,
606 const u8 *addr, u32 supp_rates)
Johannes Berg8bf11d82011-12-15 11:17:37 +0100607 __acquires(RCU)
608{
609 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
610 struct ieee80211_local *local = sdata->local;
611 struct sta_info *sta;
Johannes Berg55de9082012-07-26 17:24:39 +0200612 struct ieee80211_chanctx_conf *chanctx_conf;
Ashok Nagarajanb422c6c2013-05-10 17:50:51 -0700613 struct ieee80211_supported_band *sband;
Simon Wunderlich74608ac2013-07-08 16:55:54 +0200614 enum nl80211_bss_scan_width scan_width;
Johannes Berg55de9082012-07-26 17:24:39 +0200615 int band;
Johannes Berg8bf11d82011-12-15 11:17:37 +0100616
617 /*
618 * XXX: Consider removing the least recently used entry and
619 * allow new one to be added.
620 */
621 if (local->num_sta >= IEEE80211_IBSS_MAX_STA_ENTRIES) {
Johannes Bergbdcbd8e2012-06-22 11:29:50 +0200622 net_info_ratelimited("%s: No room for a new IBSS STA entry %pM\n",
Joe Perchese87cc472012-05-13 21:56:26 +0000623 sdata->name, addr);
Johannes Berg8bf11d82011-12-15 11:17:37 +0100624 rcu_read_lock();
625 return NULL;
626 }
627
628 if (ifibss->state == IEEE80211_IBSS_MLME_SEARCH) {
629 rcu_read_lock();
630 return NULL;
631 }
632
Joe Perchesb203ca32012-05-08 18:56:52 +0000633 if (!ether_addr_equal(bssid, sdata->u.ibss.bssid)) {
Johannes Berg8bf11d82011-12-15 11:17:37 +0100634 rcu_read_lock();
635 return NULL;
636 }
637
Johannes Berg55de9082012-07-26 17:24:39 +0200638 rcu_read_lock();
639 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
640 if (WARN_ON_ONCE(!chanctx_conf))
641 return NULL;
Johannes Berg4bf88532012-11-09 11:39:59 +0100642 band = chanctx_conf->def.chan->band;
Simon Wunderlich74608ac2013-07-08 16:55:54 +0200643 scan_width = cfg80211_chandef_to_scan_width(&chanctx_conf->def);
Johannes Berg55de9082012-07-26 17:24:39 +0200644 rcu_read_unlock();
645
Johannes Berg8bf11d82011-12-15 11:17:37 +0100646 sta = sta_info_alloc(sdata, addr, GFP_KERNEL);
647 if (!sta) {
648 rcu_read_lock();
649 return NULL;
650 }
651
Johannes Berge5a9f8d2015-10-16 17:54:47 +0200652 sta->rx_stats.last_rx = jiffies;
Johannes Berg8bf11d82011-12-15 11:17:37 +0100653
654 /* make sure mandatory rates are always added */
Ashok Nagarajanb422c6c2013-05-10 17:50:51 -0700655 sband = local->hw.wiphy->bands[band];
Johannes Berg8bf11d82011-12-15 11:17:37 +0100656 sta->sta.supp_rates[band] = supp_rates |
Simon Wunderlich74608ac2013-07-08 16:55:54 +0200657 ieee80211_mandatory_rates(sband, scan_width);
Johannes Berg8bf11d82011-12-15 11:17:37 +0100658
Antonio Quartulli52874a52013-06-18 14:20:40 +0200659 return ieee80211_ibss_finish_sta(sta);
Antonio Quartulli6d810f12012-01-18 00:10:44 +0100660}
661
Simon Wunderlich871a4182013-08-28 13:41:30 +0200662static int ieee80211_sta_active_ibss(struct ieee80211_sub_if_data *sdata)
663{
664 struct ieee80211_local *local = sdata->local;
665 int active = 0;
666 struct sta_info *sta;
667
668 sdata_assert_lock(sdata);
669
670 rcu_read_lock();
671
672 list_for_each_entry_rcu(sta, &local->sta_list, list) {
673 if (sta->sdata == sdata &&
Johannes Berge5a9f8d2015-10-16 17:54:47 +0200674 time_after(sta->rx_stats.last_rx +
675 IEEE80211_IBSS_MERGE_INTERVAL,
Simon Wunderlich871a4182013-08-28 13:41:30 +0200676 jiffies)) {
677 active++;
678 break;
679 }
680 }
681
682 rcu_read_unlock();
683
684 return active;
685}
686
687static void ieee80211_ibss_disconnect(struct ieee80211_sub_if_data *sdata)
688{
689 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
690 struct ieee80211_local *local = sdata->local;
691 struct cfg80211_bss *cbss;
692 struct beacon_data *presp;
693 struct sta_info *sta;
Simon Wunderlich871a4182013-08-28 13:41:30 +0200694
Sujith Manoharand4c80d92014-01-30 14:17:28 +0530695 if (!is_zero_ether_addr(ifibss->bssid)) {
Simon Wunderlich871a4182013-08-28 13:41:30 +0200696 cbss = cfg80211_get_bss(local->hw.wiphy, ifibss->chandef.chan,
697 ifibss->bssid, ifibss->ssid,
Dedy Lansky6eb18132015-02-08 15:52:03 +0200698 ifibss->ssid_len,
699 IEEE80211_BSS_TYPE_IBSS,
700 IEEE80211_PRIVACY(ifibss->privacy));
Simon Wunderlich871a4182013-08-28 13:41:30 +0200701
702 if (cbss) {
703 cfg80211_unlink_bss(local->hw.wiphy, cbss);
704 cfg80211_put_bss(sdata->local->hw.wiphy, cbss);
705 }
706 }
707
708 ifibss->state = IEEE80211_IBSS_MLME_SEARCH;
709
710 sta_info_flush(sdata);
711
712 spin_lock_bh(&ifibss->incomplete_lock);
713 while (!list_empty(&ifibss->incomplete_stations)) {
714 sta = list_first_entry(&ifibss->incomplete_stations,
715 struct sta_info, list);
716 list_del(&sta->list);
717 spin_unlock_bh(&ifibss->incomplete_lock);
718
719 sta_info_free(local, sta);
720 spin_lock_bh(&ifibss->incomplete_lock);
721 }
722 spin_unlock_bh(&ifibss->incomplete_lock);
723
724 netif_carrier_off(sdata->dev);
725
726 sdata->vif.bss_conf.ibss_joined = false;
727 sdata->vif.bss_conf.ibss_creator = false;
728 sdata->vif.bss_conf.enable_beacon = false;
729 sdata->vif.bss_conf.ssid_len = 0;
730
731 /* remove beacon */
732 presp = rcu_dereference_protected(ifibss->presp,
733 lockdep_is_held(&sdata->wdev.mtx));
734 RCU_INIT_POINTER(sdata->u.ibss.presp, NULL);
735 if (presp)
736 kfree_rcu(presp, rcu_head);
737
738 clear_bit(SDATA_STATE_OFFCHANNEL_BEACON_STOPPED, &sdata->state);
739 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BEACON_ENABLED |
740 BSS_CHANGED_IBSS);
Johannes Berg55fff502013-08-19 18:48:41 +0200741 drv_leave_ibss(local, sdata);
Johannes Berg34a37402013-12-18 09:43:33 +0100742 mutex_lock(&local->mtx);
Simon Wunderlich871a4182013-08-28 13:41:30 +0200743 ieee80211_vif_release_channel(sdata);
Johannes Berg34a37402013-12-18 09:43:33 +0100744 mutex_unlock(&local->mtx);
Simon Wunderlich871a4182013-08-28 13:41:30 +0200745}
746
Simon Wunderlichcd7760e2013-08-28 13:41:31 +0200747static void ieee80211_csa_connection_drop_work(struct work_struct *work)
748{
749 struct ieee80211_sub_if_data *sdata =
750 container_of(work, struct ieee80211_sub_if_data,
751 u.ibss.csa_connection_drop_work);
752
Luciano Coelho6f07d212013-12-11 20:39:46 +0200753 sdata_lock(sdata);
754
Simon Wunderlichcd7760e2013-08-28 13:41:31 +0200755 ieee80211_ibss_disconnect(sdata);
756 synchronize_rcu();
757 skb_queue_purge(&sdata->skb_queue);
758
759 /* trigger a scan to find another IBSS network to join */
760 ieee80211_queue_work(&sdata->local->hw, &sdata->work);
Luciano Coelho6f07d212013-12-11 20:39:46 +0200761
762 sdata_unlock(sdata);
Simon Wunderlichcd7760e2013-08-28 13:41:31 +0200763}
764
Simon Wunderlich8e8d3472013-10-07 18:41:06 +0200765static void ieee80211_ibss_csa_mark_radar(struct ieee80211_sub_if_data *sdata)
766{
767 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
768 int err;
769
770 /* if the current channel is a DFS channel, mark the channel as
771 * unavailable.
772 */
773 err = cfg80211_chandef_dfs_required(sdata->local->hw.wiphy,
Luciano Coelho2beb6dab2014-02-18 11:40:36 +0200774 &ifibss->chandef,
775 NL80211_IFTYPE_ADHOC);
Simon Wunderlich8e8d3472013-10-07 18:41:06 +0200776 if (err > 0)
777 cfg80211_radar_event(sdata->local->hw.wiphy, &ifibss->chandef,
778 GFP_ATOMIC);
779}
780
Simon Wunderlichcd7760e2013-08-28 13:41:31 +0200781static bool
782ieee80211_ibss_process_chanswitch(struct ieee80211_sub_if_data *sdata,
783 struct ieee802_11_elems *elems,
784 bool beacon)
785{
786 struct cfg80211_csa_settings params;
Chun-Yeow Yeohc0f17eb2013-10-14 19:08:29 -0700787 struct ieee80211_csa_ie csa_ie;
Simon Wunderlichcd7760e2013-08-28 13:41:31 +0200788 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
Simon Wunderlichcd7760e2013-08-28 13:41:31 +0200789 enum nl80211_channel_type ch_type;
Luciano Coelho82a8e172013-12-13 21:13:50 +0200790 int err;
Simon Wunderlichcd7760e2013-08-28 13:41:31 +0200791 u32 sta_flags;
Simon Wunderlichcd7760e2013-08-28 13:41:31 +0200792
Michal Kaziordbd72852014-01-29 07:56:21 +0100793 sdata_assert_lock(sdata);
794
Simon Wunderlichcd7760e2013-08-28 13:41:31 +0200795 sta_flags = IEEE80211_STA_DISABLE_VHT;
796 switch (ifibss->chandef.width) {
797 case NL80211_CHAN_WIDTH_5:
798 case NL80211_CHAN_WIDTH_10:
799 case NL80211_CHAN_WIDTH_20_NOHT:
800 sta_flags |= IEEE80211_STA_DISABLE_HT;
801 /* fall through */
802 case NL80211_CHAN_WIDTH_20:
803 sta_flags |= IEEE80211_STA_DISABLE_40MHZ;
804 break;
805 default:
806 break;
807 }
808
809 memset(&params, 0, sizeof(params));
Chun-Yeow Yeohc0f17eb2013-10-14 19:08:29 -0700810 memset(&csa_ie, 0, sizeof(csa_ie));
Luciano Coelho84469a42014-10-28 13:33:04 +0200811 err = ieee80211_parse_ch_switch_ie(sdata, elems,
Simon Wunderlichcd7760e2013-08-28 13:41:31 +0200812 ifibss->chandef.chan->band,
Chun-Yeow Yeohc0f17eb2013-10-14 19:08:29 -0700813 sta_flags, ifibss->bssid, &csa_ie);
Simon Wunderlichcd7760e2013-08-28 13:41:31 +0200814 /* can't switch to destination channel, fail */
815 if (err < 0)
816 goto disconnect;
817
818 /* did not contain a CSA */
819 if (err)
820 return false;
821
Simon Wunderlich0834ae32013-11-26 16:45:18 +0100822 /* channel switch is not supported, disconnect */
823 if (!(sdata->local->hw.wiphy->flags & WIPHY_FLAG_HAS_CHANNEL_SWITCH))
824 goto disconnect;
825
Chun-Yeow Yeohc0f17eb2013-10-14 19:08:29 -0700826 params.count = csa_ie.count;
827 params.chandef = csa_ie.chandef;
828
Simon Wunderlichcd7760e2013-08-28 13:41:31 +0200829 switch (ifibss->chandef.width) {
830 case NL80211_CHAN_WIDTH_20_NOHT:
831 case NL80211_CHAN_WIDTH_20:
832 case NL80211_CHAN_WIDTH_40:
833 /* keep our current HT mode (HT20/HT40+/HT40-), even if
834 * another mode has been announced. The mode is not adopted
835 * within the beacon while doing CSA and we should therefore
836 * keep the mode which we announce.
837 */
838 ch_type = cfg80211_get_chandef_type(&ifibss->chandef);
839 cfg80211_chandef_create(&params.chandef, params.chandef.chan,
840 ch_type);
841 break;
842 case NL80211_CHAN_WIDTH_5:
843 case NL80211_CHAN_WIDTH_10:
844 if (params.chandef.width != ifibss->chandef.width) {
845 sdata_info(sdata,
846 "IBSS %pM received channel switch from incompatible channel width (%d MHz, width:%d, CF1/2: %d/%d MHz), disconnecting\n",
847 ifibss->bssid,
848 params.chandef.chan->center_freq,
849 params.chandef.width,
850 params.chandef.center_freq1,
851 params.chandef.center_freq2);
852 goto disconnect;
853 }
854 break;
855 default:
856 /* should not happen, sta_flags should prevent VHT modes. */
857 WARN_ON(1);
858 goto disconnect;
859 }
860
Ilan Peer174e0cd2014-02-23 09:13:01 +0200861 if (!cfg80211_reg_can_beacon(sdata->local->hw.wiphy, &params.chandef,
862 NL80211_IFTYPE_ADHOC)) {
Simon Wunderlichcd7760e2013-08-28 13:41:31 +0200863 sdata_info(sdata,
864 "IBSS %pM switches to unsupported channel (%d MHz, width:%d, CF1/2: %d/%d MHz), disconnecting\n",
865 ifibss->bssid,
866 params.chandef.chan->center_freq,
867 params.chandef.width,
868 params.chandef.center_freq1,
869 params.chandef.center_freq2);
870 goto disconnect;
871 }
872
873 err = cfg80211_chandef_dfs_required(sdata->local->hw.wiphy,
Luciano Coelho2beb6dab2014-02-18 11:40:36 +0200874 &params.chandef,
875 NL80211_IFTYPE_ADHOC);
Simon Wunderlichcd7760e2013-08-28 13:41:31 +0200876 if (err < 0)
877 goto disconnect;
Luciano Coelho2beb6dab2014-02-18 11:40:36 +0200878 if (err > 0 && !ifibss->userspace_handles_dfs) {
Simon Wunderlich8e8d3472013-10-07 18:41:06 +0200879 /* IBSS-DFS only allowed with a control program */
Luciano Coelho2beb6dab2014-02-18 11:40:36 +0200880 goto disconnect;
Simon Wunderlichcd7760e2013-08-28 13:41:31 +0200881 }
882
Luciano Coelho2beb6dab2014-02-18 11:40:36 +0200883 params.radar_required = err;
884
Luciano Coelho82a8e172013-12-13 21:13:50 +0200885 if (cfg80211_chandef_identical(&params.chandef,
886 &sdata->vif.bss_conf.chandef)) {
887 ibss_dbg(sdata,
888 "received csa with an identical chandef, ignoring\n");
889 return true;
Simon Wunderlichcd7760e2013-08-28 13:41:31 +0200890 }
891
Simon Wunderlichcd7760e2013-08-28 13:41:31 +0200892 /* all checks done, now perform the channel switch. */
893 ibss_dbg(sdata,
894 "received channel switch announcement to go to channel %d MHz\n",
895 params.chandef.chan->center_freq);
896
Chun-Yeow Yeohc0f17eb2013-10-14 19:08:29 -0700897 params.block_tx = !!csa_ie.mode;
Simon Wunderlichcd7760e2013-08-28 13:41:31 +0200898
Luciano Coelho82a8e172013-12-13 21:13:50 +0200899 if (ieee80211_channel_switch(sdata->local->hw.wiphy, sdata->dev,
900 &params))
901 goto disconnect;
Simon Wunderlichcd7760e2013-08-28 13:41:31 +0200902
Simon Wunderlich8e8d3472013-10-07 18:41:06 +0200903 ieee80211_ibss_csa_mark_radar(sdata);
904
Simon Wunderlichcd7760e2013-08-28 13:41:31 +0200905 return true;
906disconnect:
907 ibss_dbg(sdata, "Can't handle channel switch, disconnect\n");
908 ieee80211_queue_work(&sdata->local->hw,
909 &ifibss->csa_connection_drop_work);
910
Simon Wunderlich8e8d3472013-10-07 18:41:06 +0200911 ieee80211_ibss_csa_mark_radar(sdata);
912
Simon Wunderlichcd7760e2013-08-28 13:41:31 +0200913 return true;
914}
915
916static void
917ieee80211_rx_mgmt_spectrum_mgmt(struct ieee80211_sub_if_data *sdata,
918 struct ieee80211_mgmt *mgmt, size_t len,
919 struct ieee80211_rx_status *rx_status,
920 struct ieee802_11_elems *elems)
921{
922 int required_len;
923
924 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
925 return;
926
927 /* CSA is the only action we handle for now */
928 if (mgmt->u.action.u.measurement.action_code !=
929 WLAN_ACTION_SPCT_CHL_SWITCH)
930 return;
931
932 required_len = IEEE80211_MIN_ACTION_SIZE +
933 sizeof(mgmt->u.action.u.chan_switch);
934 if (len < required_len)
935 return;
936
Luciano Coelho82a8e172013-12-13 21:13:50 +0200937 if (!sdata->vif.csa_active)
938 ieee80211_ibss_process_chanswitch(sdata, elems, false);
Simon Wunderlichcd7760e2013-08-28 13:41:31 +0200939}
940
Antonio Quartulli2cc59e72012-09-07 13:28:53 +0200941static void ieee80211_rx_mgmt_deauth_ibss(struct ieee80211_sub_if_data *sdata,
942 struct ieee80211_mgmt *mgmt,
943 size_t len)
944{
945 u16 reason = le16_to_cpu(mgmt->u.deauth.reason_code);
946
947 if (len < IEEE80211_DEAUTH_FRAME_LEN)
948 return;
949
950 ibss_dbg(sdata, "RX DeAuth SA=%pM DA=%pM BSSID=%pM (reason: %d)\n",
951 mgmt->sa, mgmt->da, mgmt->bssid, reason);
952 sta_info_destroy_addr(sdata, mgmt->sa);
953}
954
Antonio Quartulli6d810f12012-01-18 00:10:44 +0100955static void ieee80211_rx_mgmt_auth_ibss(struct ieee80211_sub_if_data *sdata,
956 struct ieee80211_mgmt *mgmt,
957 size_t len)
958{
959 u16 auth_alg, auth_transaction;
960
Johannes Berg8d61ffa2013-05-10 12:32:47 +0200961 sdata_assert_lock(sdata);
Antonio Quartulli6d810f12012-01-18 00:10:44 +0100962
963 if (len < 24 + 6)
964 return;
965
966 auth_alg = le16_to_cpu(mgmt->u.auth.auth_alg);
967 auth_transaction = le16_to_cpu(mgmt->u.auth.auth_transaction);
968
Johannes Bergbdcbd8e2012-06-22 11:29:50 +0200969 ibss_dbg(sdata,
970 "RX Auth SA=%pM DA=%pM BSSID=%pM (auth_transaction=%d)\n",
971 mgmt->sa, mgmt->da, mgmt->bssid, auth_transaction);
Antonio Quartulli7bed2052012-11-25 23:24:27 +0100972
973 if (auth_alg != WLAN_AUTH_OPEN || auth_transaction != 1)
974 return;
975
Antonio Quartulli2cc59e72012-09-07 13:28:53 +0200976 /*
Antonio Quartulli6d810f12012-01-18 00:10:44 +0100977 * IEEE 802.11 standard does not require authentication in IBSS
978 * networks and most implementations do not seem to use it.
979 * However, try to reply to authentication attempts if someone
980 * has actually implemented this.
981 */
Jouni Malinen700e8ea2012-09-30 19:29:37 +0300982 ieee80211_send_auth(sdata, 2, WLAN_AUTH_OPEN, 0, NULL, 0,
Johannes Berg1672c0e32013-01-29 15:02:27 +0100983 mgmt->sa, sdata->u.ibss.bssid, NULL, 0, 0, 0);
Johannes Berg8bf11d82011-12-15 11:17:37 +0100984}
985
Janusz.Dziedzic@tieto.com8a4988d2015-03-09 07:58:15 +0100986static void ieee80211_update_sta_info(struct ieee80211_sub_if_data *sdata,
987 struct ieee80211_mgmt *mgmt, size_t len,
988 struct ieee80211_rx_status *rx_status,
989 struct ieee802_11_elems *elems,
990 struct ieee80211_channel *channel)
991{
992 struct sta_info *sta;
993 enum ieee80211_band band = rx_status->band;
994 enum nl80211_bss_scan_width scan_width;
995 struct ieee80211_local *local = sdata->local;
996 struct ieee80211_supported_band *sband = local->hw.wiphy->bands[band];
997 bool rates_updated = false;
998 u32 supp_rates = 0;
999
1000 if (sdata->vif.type != NL80211_IFTYPE_ADHOC)
1001 return;
1002
1003 if (!ether_addr_equal(mgmt->bssid, sdata->u.ibss.bssid))
1004 return;
1005
1006 rcu_read_lock();
1007 sta = sta_info_get(sdata, mgmt->sa);
1008
1009 if (elems->supp_rates) {
1010 supp_rates = ieee80211_sta_get_rates(sdata, elems,
1011 band, NULL);
1012 if (sta) {
1013 u32 prev_rates;
1014
1015 prev_rates = sta->sta.supp_rates[band];
1016 /* make sure mandatory rates are always added */
1017 scan_width = NL80211_BSS_CHAN_WIDTH_20;
1018 if (rx_status->flag & RX_FLAG_5MHZ)
1019 scan_width = NL80211_BSS_CHAN_WIDTH_5;
1020 if (rx_status->flag & RX_FLAG_10MHZ)
1021 scan_width = NL80211_BSS_CHAN_WIDTH_10;
1022
1023 sta->sta.supp_rates[band] = supp_rates |
1024 ieee80211_mandatory_rates(sband, scan_width);
1025 if (sta->sta.supp_rates[band] != prev_rates) {
1026 ibss_dbg(sdata,
1027 "updated supp_rates set for %pM based on beacon/probe_resp (0x%x -> 0x%x)\n",
1028 sta->sta.addr, prev_rates,
1029 sta->sta.supp_rates[band]);
1030 rates_updated = true;
1031 }
1032 } else {
1033 rcu_read_unlock();
1034 sta = ieee80211_ibss_add_sta(sdata, mgmt->bssid,
1035 mgmt->sa, supp_rates);
1036 }
1037 }
1038
Johannes Berg96a4688e2015-05-11 14:01:36 +02001039 if (sta && !sta->sta.wme &&
1040 elems->wmm_info && local->hw.queues >= IEEE80211_NUM_ACS) {
Janusz.Dziedzic@tieto.com8a4988d2015-03-09 07:58:15 +01001041 sta->sta.wme = true;
Johannes Berg96a4688e2015-05-11 14:01:36 +02001042 ieee80211_check_fast_xmit(sta);
1043 }
Janusz.Dziedzic@tieto.com8a4988d2015-03-09 07:58:15 +01001044
1045 if (sta && elems->ht_operation && elems->ht_cap_elem &&
1046 sdata->u.ibss.chandef.width != NL80211_CHAN_WIDTH_20_NOHT &&
1047 sdata->u.ibss.chandef.width != NL80211_CHAN_WIDTH_5 &&
1048 sdata->u.ibss.chandef.width != NL80211_CHAN_WIDTH_10) {
1049 /* we both use HT */
1050 struct ieee80211_ht_cap htcap_ie;
1051 struct cfg80211_chan_def chandef;
Janusz.Dziedzic@tieto.comabcff6e2015-03-20 06:37:01 +01001052 enum ieee80211_sta_rx_bandwidth bw = sta->sta.bandwidth;
Janusz.Dziedzic@tieto.com8a4988d2015-03-09 07:58:15 +01001053
Johannes Berg8ac3c7042015-12-18 15:08:34 +01001054 cfg80211_chandef_create(&chandef, channel, NL80211_CHAN_NO_HT);
1055 ieee80211_chandef_ht_oper(elems->ht_operation, &chandef);
Janusz.Dziedzic@tieto.com8a4988d2015-03-09 07:58:15 +01001056
1057 memcpy(&htcap_ie, elems->ht_cap_elem, sizeof(htcap_ie));
Janusz.Dziedzic@tieto.com8a4988d2015-03-09 07:58:15 +01001058 rates_updated |= ieee80211_ht_cap_ie_to_sta_ht_cap(sdata, sband,
1059 &htcap_ie,
1060 sta);
Janusz.Dziedzic@tieto.comabcff6e2015-03-20 06:37:01 +01001061
1062 if (elems->vht_operation && elems->vht_cap_elem &&
1063 sdata->u.ibss.chandef.width != NL80211_CHAN_WIDTH_20 &&
1064 sdata->u.ibss.chandef.width != NL80211_CHAN_WIDTH_40) {
1065 /* we both use VHT */
1066 struct ieee80211_vht_cap cap_ie;
1067 struct ieee80211_sta_vht_cap cap = sta->sta.vht_cap;
1068
Johannes Berg8ac3c7042015-12-18 15:08:34 +01001069 ieee80211_chandef_vht_oper(elems->vht_operation,
1070 &chandef);
Janusz.Dziedzic@tieto.comabcff6e2015-03-20 06:37:01 +01001071 memcpy(&cap_ie, elems->vht_cap_elem, sizeof(cap_ie));
1072 ieee80211_vht_cap_ie_to_sta_vht_cap(sdata, sband,
1073 &cap_ie, sta);
1074 if (memcmp(&cap, &sta->sta.vht_cap, sizeof(cap)))
1075 rates_updated |= true;
1076 }
1077
1078 if (bw != sta->sta.bandwidth)
1079 rates_updated |= true;
1080
1081 if (!cfg80211_chandef_compatible(&sdata->u.ibss.chandef,
1082 &chandef))
1083 WARN_ON_ONCE(1);
Janusz.Dziedzic@tieto.com8a4988d2015-03-09 07:58:15 +01001084 }
1085
1086 if (sta && rates_updated) {
1087 u32 changed = IEEE80211_RC_SUPP_RATES_CHANGED;
1088 u8 rx_nss = sta->sta.rx_nss;
1089
1090 /* Force rx_nss recalculation */
1091 sta->sta.rx_nss = 0;
1092 rate_control_rate_init(sta);
1093 if (sta->sta.rx_nss != rx_nss)
1094 changed |= IEEE80211_RC_NSS_CHANGED;
1095
1096 drv_sta_rc_update(local, sdata, &sta->sta, changed);
1097 }
1098
1099 rcu_read_unlock();
1100}
1101
Johannes Berg46900292009-02-15 12:44:28 +01001102static void ieee80211_rx_bss_info(struct ieee80211_sub_if_data *sdata,
Emmanuel Grumbachd45c4172012-12-10 16:19:13 +02001103 struct ieee80211_mgmt *mgmt, size_t len,
Johannes Berg46900292009-02-15 12:44:28 +01001104 struct ieee80211_rx_status *rx_status,
Emmanuel Grumbachd45c4172012-12-10 16:19:13 +02001105 struct ieee802_11_elems *elems)
Johannes Berg46900292009-02-15 12:44:28 +01001106{
1107 struct ieee80211_local *local = sdata->local;
Johannes Berg0c1ad2c2009-12-23 13:15:39 +01001108 struct cfg80211_bss *cbss;
Johannes Berg46900292009-02-15 12:44:28 +01001109 struct ieee80211_bss *bss;
Johannes Berg46900292009-02-15 12:44:28 +01001110 struct ieee80211_channel *channel;
1111 u64 beacon_timestamp, rx_timestamp;
1112 u32 supp_rates = 0;
1113 enum ieee80211_band band = rx_status->band;
1114
Emmanuel Grumbach3afc2162014-03-04 16:50:13 +02001115 channel = ieee80211_get_channel(local->hw.wiphy, rx_status->freq);
1116 if (!channel)
Johannes Berg46900292009-02-15 12:44:28 +01001117 return;
1118
Janusz.Dziedzic@tieto.com8a4988d2015-03-09 07:58:15 +01001119 ieee80211_update_sta_info(sdata, mgmt, len, rx_status, elems, channel);
Johannes Berg46900292009-02-15 12:44:28 +01001120
1121 bss = ieee80211_bss_info_update(local, rx_status, mgmt, len, elems,
Emmanuel Grumbachd45c4172012-12-10 16:19:13 +02001122 channel);
Johannes Berg46900292009-02-15 12:44:28 +01001123 if (!bss)
1124 return;
1125
Johannes Berg0c1ad2c2009-12-23 13:15:39 +01001126 cbss = container_of((void *)bss, struct cfg80211_bss, priv);
1127
Johannes Berg8cef2c92013-02-05 16:54:31 +01001128 /* same for beacon and probe response */
1129 beacon_timestamp = le64_to_cpu(mgmt->u.beacon.timestamp);
Johannes Berg46900292009-02-15 12:44:28 +01001130
1131 /* check if we need to merge IBSS */
1132
Johannes Berg46900292009-02-15 12:44:28 +01001133 /* not an IBSS */
Johannes Berg0c1ad2c2009-12-23 13:15:39 +01001134 if (!(cbss->capability & WLAN_CAPABILITY_IBSS))
Johannes Berg46900292009-02-15 12:44:28 +01001135 goto put_bss;
1136
1137 /* different channel */
Johannes Berg55de9082012-07-26 17:24:39 +02001138 if (sdata->u.ibss.fixed_channel &&
Simon Wunderlich3aede782013-05-16 13:00:36 +02001139 sdata->u.ibss.chandef.chan != cbss->channel)
Johannes Berg46900292009-02-15 12:44:28 +01001140 goto put_bss;
1141
1142 /* different SSID */
1143 if (elems->ssid_len != sdata->u.ibss.ssid_len ||
1144 memcmp(elems->ssid, sdata->u.ibss.ssid,
1145 sdata->u.ibss.ssid_len))
1146 goto put_bss;
1147
Simon Wunderlichcd7760e2013-08-28 13:41:31 +02001148 /* process channel switch */
Luciano Coelho82a8e172013-12-13 21:13:50 +02001149 if (sdata->vif.csa_active ||
1150 ieee80211_ibss_process_chanswitch(sdata, elems, true))
Simon Wunderlichcd7760e2013-08-28 13:41:31 +02001151 goto put_bss;
1152
Alina Friedrichsen34e8f082009-02-22 00:07:28 +01001153 /* same BSSID */
Joe Perchesb203ca32012-05-08 18:56:52 +00001154 if (ether_addr_equal(cbss->bssid, sdata->u.ibss.bssid))
Alina Friedrichsen34e8f082009-02-22 00:07:28 +01001155 goto put_bss;
1156
Simon Wunderlichcd7760e2013-08-28 13:41:31 +02001157 /* we use a fixed BSSID */
1158 if (sdata->u.ibss.fixed_bssid)
1159 goto put_bss;
1160
Thomas Pedersenf4bda332012-11-13 10:46:27 -08001161 if (ieee80211_have_rx_timestamp(rx_status)) {
1162 /* time when timestamp field was received */
1163 rx_timestamp =
1164 ieee80211_calculate_rx_timestamp(local, rx_status,
1165 len + FCS_LEN, 24);
Johannes Berg24487982009-04-23 18:52:52 +02001166 } else {
1167 /*
1168 * second best option: get current TSF
1169 * (will return -1 if not supported)
1170 */
Eliad Peller37a41b42011-09-21 14:06:11 +03001171 rx_timestamp = drv_get_tsf(local, sdata);
Johannes Berg24487982009-04-23 18:52:52 +02001172 }
Johannes Berg46900292009-02-15 12:44:28 +01001173
Johannes Bergbdcbd8e2012-06-22 11:29:50 +02001174 ibss_dbg(sdata,
1175 "RX beacon SA=%pM BSSID=%pM TSF=0x%llx BCN=0x%llx diff=%lld @%lu\n",
1176 mgmt->sa, mgmt->bssid,
1177 (unsigned long long)rx_timestamp,
1178 (unsigned long long)beacon_timestamp,
1179 (unsigned long long)(rx_timestamp - beacon_timestamp),
1180 jiffies);
Johannes Berg46900292009-02-15 12:44:28 +01001181
1182 if (beacon_timestamp > rx_timestamp) {
Johannes Bergbdcbd8e2012-06-22 11:29:50 +02001183 ibss_dbg(sdata,
1184 "beacon TSF higher than local TSF - IBSS merge with BSSID %pM\n",
1185 mgmt->bssid);
Johannes Berg46900292009-02-15 12:44:28 +01001186 ieee80211_sta_join_ibss(sdata, bss);
Simon Wunderlich2103dec2013-07-08 16:55:53 +02001187 supp_rates = ieee80211_sta_get_rates(sdata, elems, band, NULL);
Johannes Berg34e89502010-02-03 13:59:58 +01001188 ieee80211_ibss_add_sta(sdata, mgmt->bssid, mgmt->sa,
Antonio Quartulli52874a52013-06-18 14:20:40 +02001189 supp_rates);
Johannes Berg8bf11d82011-12-15 11:17:37 +01001190 rcu_read_unlock();
Johannes Berg46900292009-02-15 12:44:28 +01001191 }
1192
1193 put_bss:
1194 ieee80211_rx_bss_put(local, bss);
1195}
1196
Johannes Berg8bf11d82011-12-15 11:17:37 +01001197void ieee80211_ibss_rx_no_sta(struct ieee80211_sub_if_data *sdata,
1198 const u8 *bssid, const u8 *addr,
1199 u32 supp_rates)
Johannes Berg46900292009-02-15 12:44:28 +01001200{
Felix Fietkau2e10d332009-12-20 19:07:09 +01001201 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
Johannes Berg46900292009-02-15 12:44:28 +01001202 struct ieee80211_local *local = sdata->local;
1203 struct sta_info *sta;
Johannes Berg55de9082012-07-26 17:24:39 +02001204 struct ieee80211_chanctx_conf *chanctx_conf;
Ashok Nagarajanb422c6c2013-05-10 17:50:51 -07001205 struct ieee80211_supported_band *sband;
Simon Wunderlich74608ac2013-07-08 16:55:54 +02001206 enum nl80211_bss_scan_width scan_width;
Johannes Berg55de9082012-07-26 17:24:39 +02001207 int band;
Johannes Berg46900292009-02-15 12:44:28 +01001208
Johannes Bergaf8cdcd2009-04-19 21:25:43 +02001209 /*
1210 * XXX: Consider removing the least recently used entry and
1211 * allow new one to be added.
1212 */
Johannes Berg46900292009-02-15 12:44:28 +01001213 if (local->num_sta >= IEEE80211_IBSS_MAX_STA_ENTRIES) {
Johannes Bergbdcbd8e2012-06-22 11:29:50 +02001214 net_info_ratelimited("%s: No room for a new IBSS STA entry %pM\n",
Joe Perchese87cc472012-05-13 21:56:26 +00001215 sdata->name, addr);
Johannes Berg8bf11d82011-12-15 11:17:37 +01001216 return;
Johannes Berg46900292009-02-15 12:44:28 +01001217 }
1218
Felix Fietkau2e10d332009-12-20 19:07:09 +01001219 if (ifibss->state == IEEE80211_IBSS_MLME_SEARCH)
Johannes Berg8bf11d82011-12-15 11:17:37 +01001220 return;
Felix Fietkau2e10d332009-12-20 19:07:09 +01001221
Joe Perchesb203ca32012-05-08 18:56:52 +00001222 if (!ether_addr_equal(bssid, sdata->u.ibss.bssid))
Johannes Berg8bf11d82011-12-15 11:17:37 +01001223 return;
Johannes Berg46900292009-02-15 12:44:28 +01001224
Johannes Berg55de9082012-07-26 17:24:39 +02001225 rcu_read_lock();
1226 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
1227 if (WARN_ON_ONCE(!chanctx_conf)) {
1228 rcu_read_unlock();
1229 return;
1230 }
Johannes Berg4bf88532012-11-09 11:39:59 +01001231 band = chanctx_conf->def.chan->band;
Simon Wunderlich74608ac2013-07-08 16:55:54 +02001232 scan_width = cfg80211_chandef_to_scan_width(&chanctx_conf->def);
Johannes Berg55de9082012-07-26 17:24:39 +02001233 rcu_read_unlock();
1234
Johannes Berg8bf11d82011-12-15 11:17:37 +01001235 sta = sta_info_alloc(sdata, addr, GFP_ATOMIC);
Johannes Berg46900292009-02-15 12:44:28 +01001236 if (!sta)
Johannes Berg8bf11d82011-12-15 11:17:37 +01001237 return;
Johannes Berg46900292009-02-15 12:44:28 +01001238
Johannes Berge5a9f8d2015-10-16 17:54:47 +02001239 sta->rx_stats.last_rx = jiffies;
Johannes Bergd9a7ddb2011-12-14 12:35:30 +01001240
Johannes Berg46900292009-02-15 12:44:28 +01001241 /* make sure mandatory rates are always added */
Ashok Nagarajanb422c6c2013-05-10 17:50:51 -07001242 sband = local->hw.wiphy->bands[band];
Johannes Berg46900292009-02-15 12:44:28 +01001243 sta->sta.supp_rates[band] = supp_rates |
Simon Wunderlich74608ac2013-07-08 16:55:54 +02001244 ieee80211_mandatory_rates(sband, scan_width);
Johannes Berg46900292009-02-15 12:44:28 +01001245
Johannes Berg8bf11d82011-12-15 11:17:37 +01001246 spin_lock(&ifibss->incomplete_lock);
1247 list_add(&sta->list, &ifibss->incomplete_stations);
1248 spin_unlock(&ifibss->incomplete_lock);
1249 ieee80211_queue_work(&local->hw, &sdata->work);
Johannes Berg46900292009-02-15 12:44:28 +01001250}
1251
Antonio Quartullidad9def2013-07-26 21:15:02 +02001252static void ieee80211_ibss_sta_expire(struct ieee80211_sub_if_data *sdata)
1253{
1254 struct ieee80211_local *local = sdata->local;
1255 struct sta_info *sta, *tmp;
1256 unsigned long exp_time = IEEE80211_IBSS_INACTIVITY_LIMIT;
Johannes Berge5a9f8d2015-10-16 17:54:47 +02001257 unsigned long exp_rsn = IEEE80211_IBSS_RSN_INACTIVITY_LIMIT;
Antonio Quartullidad9def2013-07-26 21:15:02 +02001258
1259 mutex_lock(&local->sta_mtx);
1260
1261 list_for_each_entry_safe(sta, tmp, &local->sta_list, list) {
1262 if (sdata != sta->sdata)
1263 continue;
1264
Johannes Berge5a9f8d2015-10-16 17:54:47 +02001265 if (time_after(jiffies, sta->rx_stats.last_rx + exp_time) ||
1266 (time_after(jiffies, sta->rx_stats.last_rx + exp_rsn) &&
Antonio Quartullidad9def2013-07-26 21:15:02 +02001267 sta->sta_state != IEEE80211_STA_AUTHORIZED)) {
1268 sta_dbg(sta->sdata, "expiring inactive %sSTA %pM\n",
1269 sta->sta_state != IEEE80211_STA_AUTHORIZED ?
1270 "not authorized " : "", sta->sta.addr);
1271
1272 WARN_ON(__sta_info_destroy(sta));
1273 }
1274 }
1275
1276 mutex_unlock(&local->sta_mtx);
1277}
1278
Benoit Papillaultce9058a2010-01-17 22:45:23 +01001279/*
1280 * This function is called with state == IEEE80211_IBSS_MLME_JOINED
1281 */
Johannes Berg46900292009-02-15 12:44:28 +01001282
1283static void ieee80211_sta_merge_ibss(struct ieee80211_sub_if_data *sdata)
1284{
1285 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
Simon Wunderlich7ca15a02013-07-08 16:55:56 +02001286 enum nl80211_bss_scan_width scan_width;
Johannes Berg46900292009-02-15 12:44:28 +01001287
Johannes Berg8d61ffa2013-05-10 12:32:47 +02001288 sdata_assert_lock(sdata);
Johannes Berg7a17a332010-07-21 11:30:27 +02001289
Johannes Bergaf8cdcd2009-04-19 21:25:43 +02001290 mod_timer(&ifibss->timer,
1291 round_jiffies(jiffies + IEEE80211_IBSS_MERGE_INTERVAL));
Johannes Berg46900292009-02-15 12:44:28 +01001292
Antonio Quartullidad9def2013-07-26 21:15:02 +02001293 ieee80211_ibss_sta_expire(sdata);
Johannes Bergaf8cdcd2009-04-19 21:25:43 +02001294
Sujith450aae32009-11-02 12:33:23 +05301295 if (time_before(jiffies, ifibss->last_scan_completed +
1296 IEEE80211_IBSS_MERGE_INTERVAL))
1297 return;
1298
Johannes Berg46900292009-02-15 12:44:28 +01001299 if (ieee80211_sta_active_ibss(sdata))
1300 return;
1301
John W. Linvillec037b832012-01-30 15:28:11 -05001302 if (ifibss->fixed_channel)
Johannes Berg46900292009-02-15 12:44:28 +01001303 return;
1304
Johannes Bergbdcbd8e2012-06-22 11:29:50 +02001305 sdata_info(sdata,
1306 "No active IBSS STAs - trying to scan for other IBSS networks with same SSID (merge)\n");
Johannes Berg46900292009-02-15 12:44:28 +01001307
Simon Wunderlich7ca15a02013-07-08 16:55:56 +02001308 scan_width = cfg80211_chandef_to_scan_width(&ifibss->chandef);
Stanislaw Gruszka34bcf712012-12-11 10:48:23 +01001309 ieee80211_request_ibss_scan(sdata, ifibss->ssid, ifibss->ssid_len,
Janusz.Dziedzic@tieto.com76bed0f2015-03-20 06:37:00 +01001310 NULL, 0, scan_width);
Johannes Berg46900292009-02-15 12:44:28 +01001311}
1312
Johannes Bergaf8cdcd2009-04-19 21:25:43 +02001313static void ieee80211_sta_create_ibss(struct ieee80211_sub_if_data *sdata)
Johannes Berg46900292009-02-15 12:44:28 +01001314{
1315 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
Johannes Berg46900292009-02-15 12:44:28 +01001316 u8 bssid[ETH_ALEN];
Johannes Berg46900292009-02-15 12:44:28 +01001317 u16 capability;
1318 int i;
1319
Johannes Berg8d61ffa2013-05-10 12:32:47 +02001320 sdata_assert_lock(sdata);
Johannes Berg7a17a332010-07-21 11:30:27 +02001321
Johannes Bergaf8cdcd2009-04-19 21:25:43 +02001322 if (ifibss->fixed_bssid) {
Johannes Berg46900292009-02-15 12:44:28 +01001323 memcpy(bssid, ifibss->bssid, ETH_ALEN);
1324 } else {
1325 /* Generate random, not broadcast, locally administered BSSID. Mix in
1326 * own MAC address to make sure that devices that do not have proper
1327 * random number generator get different BSSID. */
1328 get_random_bytes(bssid, ETH_ALEN);
1329 for (i = 0; i < ETH_ALEN; i++)
Johannes Berg47846c92009-11-25 17:46:19 +01001330 bssid[i] ^= sdata->vif.addr[i];
Johannes Berg46900292009-02-15 12:44:28 +01001331 bssid[0] &= ~0x01;
1332 bssid[0] |= 0x02;
1333 }
1334
Johannes Bergbdcbd8e2012-06-22 11:29:50 +02001335 sdata_info(sdata, "Creating new IBSS network, BSSID %pM\n", bssid);
Johannes Berg46900292009-02-15 12:44:28 +01001336
Johannes Berg46900292009-02-15 12:44:28 +01001337 capability = WLAN_CAPABILITY_IBSS;
1338
Johannes Bergfffd0932009-07-08 14:22:54 +02001339 if (ifibss->privacy)
Johannes Berg46900292009-02-15 12:44:28 +01001340 capability |= WLAN_CAPABILITY_PRIVACY;
Johannes Berg46900292009-02-15 12:44:28 +01001341
Johannes Berg57c4d7b2009-04-23 16:10:04 +02001342 __ieee80211_sta_join_ibss(sdata, bssid, sdata->vif.bss_conf.beacon_int,
Simon Wunderlich75a423f2013-08-21 15:30:25 +02001343 &ifibss->chandef, ifibss->basic_rates,
Sujith Manoharanc13a7652012-10-12 17:35:45 +05301344 capability, 0, true);
Johannes Berg46900292009-02-15 12:44:28 +01001345}
1346
Janusz.Dziedzic@tieto.com76bed0f2015-03-20 06:37:00 +01001347static unsigned ibss_setup_channels(struct wiphy *wiphy,
1348 struct ieee80211_channel **channels,
1349 unsigned int channels_max,
1350 u32 center_freq, u32 width)
1351{
1352 struct ieee80211_channel *chan = NULL;
1353 unsigned int n_chan = 0;
1354 u32 start_freq, end_freq, freq;
1355
1356 if (width <= 20) {
1357 start_freq = center_freq;
1358 end_freq = center_freq;
1359 } else {
1360 start_freq = center_freq - width / 2 + 10;
1361 end_freq = center_freq + width / 2 - 10;
1362 }
1363
1364 for (freq = start_freq; freq <= end_freq; freq += 20) {
1365 chan = ieee80211_get_channel(wiphy, freq);
1366 if (!chan)
1367 continue;
1368 if (n_chan >= channels_max)
1369 return n_chan;
1370
1371 channels[n_chan] = chan;
1372 n_chan++;
1373 }
1374
1375 return n_chan;
1376}
1377
1378static unsigned int
1379ieee80211_ibss_setup_scan_channels(struct wiphy *wiphy,
1380 const struct cfg80211_chan_def *chandef,
1381 struct ieee80211_channel **channels,
1382 unsigned int channels_max)
1383{
1384 unsigned int n_chan = 0;
1385 u32 width, cf1, cf2 = 0;
1386
1387 switch (chandef->width) {
1388 case NL80211_CHAN_WIDTH_40:
1389 width = 40;
1390 break;
1391 case NL80211_CHAN_WIDTH_80P80:
1392 cf2 = chandef->center_freq2;
1393 /* fall through */
1394 case NL80211_CHAN_WIDTH_80:
1395 width = 80;
1396 break;
1397 case NL80211_CHAN_WIDTH_160:
1398 width = 160;
1399 break;
1400 default:
1401 width = 20;
1402 break;
1403 }
1404
1405 cf1 = chandef->center_freq1;
1406
1407 n_chan = ibss_setup_channels(wiphy, channels, channels_max, cf1, width);
1408
1409 if (cf2)
1410 n_chan += ibss_setup_channels(wiphy, &channels[n_chan],
1411 channels_max - n_chan, cf2,
1412 width);
1413
1414 return n_chan;
1415}
1416
Benoit Papillaultce9058a2010-01-17 22:45:23 +01001417/*
1418 * This function is called with state == IEEE80211_IBSS_MLME_SEARCH
1419 */
1420
Johannes Bergaf8cdcd2009-04-19 21:25:43 +02001421static void ieee80211_sta_find_ibss(struct ieee80211_sub_if_data *sdata)
Johannes Berg46900292009-02-15 12:44:28 +01001422{
1423 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1424 struct ieee80211_local *local = sdata->local;
Johannes Berg0c1ad2c2009-12-23 13:15:39 +01001425 struct cfg80211_bss *cbss;
Johannes Bergaf8cdcd2009-04-19 21:25:43 +02001426 struct ieee80211_channel *chan = NULL;
Johannes Berg46900292009-02-15 12:44:28 +01001427 const u8 *bssid = NULL;
Simon Wunderlich7ca15a02013-07-08 16:55:56 +02001428 enum nl80211_bss_scan_width scan_width;
Johannes Berg46900292009-02-15 12:44:28 +01001429 int active_ibss;
1430
Johannes Berg8d61ffa2013-05-10 12:32:47 +02001431 sdata_assert_lock(sdata);
Johannes Berg7a17a332010-07-21 11:30:27 +02001432
Johannes Berg46900292009-02-15 12:44:28 +01001433 active_ibss = ieee80211_sta_active_ibss(sdata);
Johannes Bergbdcbd8e2012-06-22 11:29:50 +02001434 ibss_dbg(sdata, "sta_find_ibss (active_ibss=%d)\n", active_ibss);
Johannes Berg46900292009-02-15 12:44:28 +01001435
1436 if (active_ibss)
Johannes Bergaf8cdcd2009-04-19 21:25:43 +02001437 return;
Johannes Berg46900292009-02-15 12:44:28 +01001438
Johannes Bergaf8cdcd2009-04-19 21:25:43 +02001439 if (ifibss->fixed_bssid)
Johannes Berg46900292009-02-15 12:44:28 +01001440 bssid = ifibss->bssid;
Johannes Bergaf8cdcd2009-04-19 21:25:43 +02001441 if (ifibss->fixed_channel)
Simon Wunderlich3aede782013-05-16 13:00:36 +02001442 chan = ifibss->chandef.chan;
Johannes Bergaf8cdcd2009-04-19 21:25:43 +02001443 if (!is_zero_ether_addr(ifibss->bssid))
1444 bssid = ifibss->bssid;
Johannes Berg0c1ad2c2009-12-23 13:15:39 +01001445 cbss = cfg80211_get_bss(local->hw.wiphy, chan, bssid,
1446 ifibss->ssid, ifibss->ssid_len,
Dedy Lansky6eb18132015-02-08 15:52:03 +02001447 IEEE80211_BSS_TYPE_IBSS,
1448 IEEE80211_PRIVACY(ifibss->privacy));
Johannes Berg46900292009-02-15 12:44:28 +01001449
Johannes Berg0c1ad2c2009-12-23 13:15:39 +01001450 if (cbss) {
1451 struct ieee80211_bss *bss;
1452
1453 bss = (void *)cbss->priv;
Johannes Bergbdcbd8e2012-06-22 11:29:50 +02001454 ibss_dbg(sdata,
1455 "sta_find_ibss: selected %pM current %pM\n",
1456 cbss->bssid, ifibss->bssid);
1457 sdata_info(sdata,
1458 "Selected IBSS BSSID %pM based on configured SSID\n",
1459 cbss->bssid);
Johannes Berg46900292009-02-15 12:44:28 +01001460
Johannes Bergaf8cdcd2009-04-19 21:25:43 +02001461 ieee80211_sta_join_ibss(sdata, bss);
Johannes Berg46900292009-02-15 12:44:28 +01001462 ieee80211_rx_bss_put(local, bss);
Johannes Bergaf8cdcd2009-04-19 21:25:43 +02001463 return;
Reinette Chatred419b9f2009-10-19 14:55:37 -07001464 }
Johannes Berg46900292009-02-15 12:44:28 +01001465
Antonio Quartullid8eb7412013-08-09 18:58:32 +02001466 /* if a fixed bssid and a fixed freq have been provided create the IBSS
1467 * directly and do not waste time scanning
1468 */
1469 if (ifibss->fixed_bssid && ifibss->fixed_channel) {
1470 sdata_info(sdata, "Created IBSS using preconfigured BSSID %pM\n",
1471 bssid);
1472 ieee80211_sta_create_ibss(sdata);
1473 return;
1474 }
1475
1476
Johannes Bergbdcbd8e2012-06-22 11:29:50 +02001477 ibss_dbg(sdata, "sta_find_ibss: did not try to join ibss\n");
Johannes Berg46900292009-02-15 12:44:28 +01001478
1479 /* Selected IBSS not found in current scan results - try to scan */
Benoit Papillaultce9058a2010-01-17 22:45:23 +01001480 if (time_after(jiffies, ifibss->last_scan_completed +
Johannes Berg46900292009-02-15 12:44:28 +01001481 IEEE80211_SCAN_INTERVAL)) {
Janusz.Dziedzic@tieto.com76bed0f2015-03-20 06:37:00 +01001482 struct ieee80211_channel *channels[8];
1483 unsigned int num;
1484
Johannes Bergbdcbd8e2012-06-22 11:29:50 +02001485 sdata_info(sdata, "Trigger new scan to find an IBSS to join\n");
Johannes Berg46900292009-02-15 12:44:28 +01001486
Simon Wunderlich7ca15a02013-07-08 16:55:56 +02001487 scan_width = cfg80211_chandef_to_scan_width(&ifibss->chandef);
Sara Sharond321cd02016-01-25 15:46:35 +02001488
1489 if (ifibss->fixed_channel) {
1490 num = ieee80211_ibss_setup_scan_channels(local->hw.wiphy,
1491 &ifibss->chandef,
1492 channels,
1493 ARRAY_SIZE(channels));
1494 ieee80211_request_ibss_scan(sdata, ifibss->ssid,
1495 ifibss->ssid_len, channels,
1496 num, scan_width);
1497 } else {
1498 ieee80211_request_ibss_scan(sdata, ifibss->ssid,
1499 ifibss->ssid_len, NULL,
1500 0, scan_width);
1501 }
Benoit Papillaultce9058a2010-01-17 22:45:23 +01001502 } else {
Johannes Berg46900292009-02-15 12:44:28 +01001503 int interval = IEEE80211_SCAN_INTERVAL;
1504
1505 if (time_after(jiffies, ifibss->ibss_join_req +
Johannes Berg55de9082012-07-26 17:24:39 +02001506 IEEE80211_IBSS_JOIN_TIMEOUT))
1507 ieee80211_sta_create_ibss(sdata);
Johannes Berg46900292009-02-15 12:44:28 +01001508
Johannes Bergaf8cdcd2009-04-19 21:25:43 +02001509 mod_timer(&ifibss->timer,
1510 round_jiffies(jiffies + interval));
Johannes Berg46900292009-02-15 12:44:28 +01001511 }
Johannes Berg46900292009-02-15 12:44:28 +01001512}
1513
1514static void ieee80211_rx_mgmt_probe_req(struct ieee80211_sub_if_data *sdata,
Johannes Bergc269a202011-02-14 12:20:22 +01001515 struct sk_buff *req)
Johannes Berg46900292009-02-15 12:44:28 +01001516{
Johannes Bergc269a202011-02-14 12:20:22 +01001517 struct ieee80211_mgmt *mgmt = (void *)req->data;
Johannes Berg46900292009-02-15 12:44:28 +01001518 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1519 struct ieee80211_local *local = sdata->local;
Johannes Bergc269a202011-02-14 12:20:22 +01001520 int tx_last_beacon, len = req->len;
Johannes Berg46900292009-02-15 12:44:28 +01001521 struct sk_buff *skb;
Johannes Bergc3ffeab2013-03-07 20:54:29 +01001522 struct beacon_data *presp;
Johannes Berg46900292009-02-15 12:44:28 +01001523 u8 *pos, *end;
1524
Johannes Berg8d61ffa2013-05-10 12:32:47 +02001525 sdata_assert_lock(sdata);
Johannes Berg7a17a332010-07-21 11:30:27 +02001526
Johannes Berg40b275b2011-05-13 14:15:49 +02001527 presp = rcu_dereference_protected(ifibss->presp,
Johannes Berg8d61ffa2013-05-10 12:32:47 +02001528 lockdep_is_held(&sdata->wdev.mtx));
Johannes Berg40b275b2011-05-13 14:15:49 +02001529
Johannes Berg46900292009-02-15 12:44:28 +01001530 if (ifibss->state != IEEE80211_IBSS_MLME_JOINED ||
Johannes Berg40b275b2011-05-13 14:15:49 +02001531 len < 24 + 2 || !presp)
Johannes Berg46900292009-02-15 12:44:28 +01001532 return;
1533
Johannes Berg24487982009-04-23 18:52:52 +02001534 tx_last_beacon = drv_tx_last_beacon(local);
Johannes Berg46900292009-02-15 12:44:28 +01001535
Johannes Bergbdcbd8e2012-06-22 11:29:50 +02001536 ibss_dbg(sdata,
1537 "RX ProbeReq SA=%pM DA=%pM BSSID=%pM (tx_last_beacon=%d)\n",
1538 mgmt->sa, mgmt->da, mgmt->bssid, tx_last_beacon);
Johannes Berg46900292009-02-15 12:44:28 +01001539
Felix Fietkau1ed76482011-03-24 19:46:18 +01001540 if (!tx_last_beacon && is_multicast_ether_addr(mgmt->da))
Johannes Berg46900292009-02-15 12:44:28 +01001541 return;
1542
Joe Perchesb203ca32012-05-08 18:56:52 +00001543 if (!ether_addr_equal(mgmt->bssid, ifibss->bssid) &&
Felix Fietkau888d04d2012-03-01 15:22:09 +01001544 !is_broadcast_ether_addr(mgmt->bssid))
Johannes Berg46900292009-02-15 12:44:28 +01001545 return;
1546
1547 end = ((u8 *) mgmt) + len;
1548 pos = mgmt->u.probe_req.variable;
1549 if (pos[0] != WLAN_EID_SSID ||
1550 pos + 2 + pos[1] > end) {
Johannes Bergbdcbd8e2012-06-22 11:29:50 +02001551 ibss_dbg(sdata, "Invalid SSID IE in ProbeReq from %pM\n",
1552 mgmt->sa);
Johannes Berg46900292009-02-15 12:44:28 +01001553 return;
1554 }
1555 if (pos[1] != 0 &&
1556 (pos[1] != ifibss->ssid_len ||
Benoit Papillault0da780c2010-02-05 01:21:03 +01001557 memcmp(pos + 2, ifibss->ssid, ifibss->ssid_len))) {
Johannes Berg46900292009-02-15 12:44:28 +01001558 /* Ignore ProbeReq for foreign SSID */
1559 return;
1560 }
1561
1562 /* Reply with ProbeResp */
Johannes Bergc3ffeab2013-03-07 20:54:29 +01001563 skb = dev_alloc_skb(local->tx_headroom + presp->head_len);
Johannes Berg46900292009-02-15 12:44:28 +01001564 if (!skb)
1565 return;
1566
Johannes Bergc3ffeab2013-03-07 20:54:29 +01001567 skb_reserve(skb, local->tx_headroom);
1568 memcpy(skb_put(skb, presp->head_len), presp->head, presp->head_len);
1569
1570 memcpy(((struct ieee80211_mgmt *) skb->data)->da, mgmt->sa, ETH_ALEN);
1571 ibss_dbg(sdata, "Sending ProbeResp to %pM\n", mgmt->sa);
Johannes Berg62ae67b2009-11-18 18:42:05 +01001572 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
Simon Wunderlich691eb612014-01-24 23:48:29 +01001573
1574 /* avoid excessive retries for probe request to wildcard SSIDs */
1575 if (pos[1] == 0)
1576 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_CTL_NO_ACK;
1577
Johannes Berg62ae67b2009-11-18 18:42:05 +01001578 ieee80211_tx_skb(sdata, skb);
Johannes Berg46900292009-02-15 12:44:28 +01001579}
1580
Emmanuel Grumbachd45c4172012-12-10 16:19:13 +02001581static
1582void ieee80211_rx_mgmt_probe_beacon(struct ieee80211_sub_if_data *sdata,
1583 struct ieee80211_mgmt *mgmt, size_t len,
1584 struct ieee80211_rx_status *rx_status)
Johannes Berg46900292009-02-15 12:44:28 +01001585{
1586 size_t baselen;
1587 struct ieee802_11_elems elems;
1588
Emmanuel Grumbachd45c4172012-12-10 16:19:13 +02001589 BUILD_BUG_ON(offsetof(typeof(mgmt->u.probe_resp), variable) !=
1590 offsetof(typeof(mgmt->u.beacon), variable));
1591
1592 /*
1593 * either beacon or probe_resp but the variable field is at the
1594 * same offset
1595 */
Johannes Berg46900292009-02-15 12:44:28 +01001596 baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt;
1597 if (baselen > len)
1598 return;
1599
1600 ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen,
Johannes Bergb2e506b2013-03-26 14:54:16 +01001601 false, &elems);
Johannes Berg46900292009-02-15 12:44:28 +01001602
Emmanuel Grumbachd45c4172012-12-10 16:19:13 +02001603 ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems);
Johannes Berg46900292009-02-15 12:44:28 +01001604}
1605
Johannes Berg1fa57d02010-06-10 10:21:32 +02001606void ieee80211_ibss_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata,
1607 struct sk_buff *skb)
Johannes Berg46900292009-02-15 12:44:28 +01001608{
1609 struct ieee80211_rx_status *rx_status;
1610 struct ieee80211_mgmt *mgmt;
1611 u16 fc;
Simon Wunderlichcd7760e2013-08-28 13:41:31 +02001612 struct ieee802_11_elems elems;
1613 int ies_len;
Johannes Berg46900292009-02-15 12:44:28 +01001614
Johannes Bergf1d58c22009-06-17 13:13:00 +02001615 rx_status = IEEE80211_SKB_RXCB(skb);
Johannes Berg46900292009-02-15 12:44:28 +01001616 mgmt = (struct ieee80211_mgmt *) skb->data;
1617 fc = le16_to_cpu(mgmt->frame_control);
1618
Johannes Berg8d61ffa2013-05-10 12:32:47 +02001619 sdata_lock(sdata);
Johannes Berg7a17a332010-07-21 11:30:27 +02001620
Tim Harveyc926d002010-12-09 10:43:13 -08001621 if (!sdata->u.ibss.ssid_len)
1622 goto mgmt_out; /* not ready to merge yet */
1623
Johannes Berg46900292009-02-15 12:44:28 +01001624 switch (fc & IEEE80211_FCTL_STYPE) {
1625 case IEEE80211_STYPE_PROBE_REQ:
Johannes Bergc269a202011-02-14 12:20:22 +01001626 ieee80211_rx_mgmt_probe_req(sdata, skb);
Johannes Berg46900292009-02-15 12:44:28 +01001627 break;
1628 case IEEE80211_STYPE_PROBE_RESP:
Johannes Berg46900292009-02-15 12:44:28 +01001629 case IEEE80211_STYPE_BEACON:
Emmanuel Grumbachd45c4172012-12-10 16:19:13 +02001630 ieee80211_rx_mgmt_probe_beacon(sdata, mgmt, skb->len,
1631 rx_status);
Johannes Berg46900292009-02-15 12:44:28 +01001632 break;
1633 case IEEE80211_STYPE_AUTH:
1634 ieee80211_rx_mgmt_auth_ibss(sdata, mgmt, skb->len);
1635 break;
Antonio Quartulli2cc59e72012-09-07 13:28:53 +02001636 case IEEE80211_STYPE_DEAUTH:
1637 ieee80211_rx_mgmt_deauth_ibss(sdata, mgmt, skb->len);
1638 break;
Simon Wunderlichcd7760e2013-08-28 13:41:31 +02001639 case IEEE80211_STYPE_ACTION:
1640 switch (mgmt->u.action.category) {
1641 case WLAN_CATEGORY_SPECTRUM_MGMT:
1642 ies_len = skb->len -
1643 offsetof(struct ieee80211_mgmt,
1644 u.action.u.chan_switch.variable);
1645
1646 if (ies_len < 0)
1647 break;
1648
1649 ieee802_11_parse_elems(
1650 mgmt->u.action.u.chan_switch.variable,
1651 ies_len, true, &elems);
1652
1653 if (elems.parse_error)
1654 break;
1655
1656 ieee80211_rx_mgmt_spectrum_mgmt(sdata, mgmt, skb->len,
1657 rx_status, &elems);
1658 break;
1659 }
Johannes Berg46900292009-02-15 12:44:28 +01001660 }
Johannes Berg7a17a332010-07-21 11:30:27 +02001661
Tim Harveyc926d002010-12-09 10:43:13 -08001662 mgmt_out:
Johannes Berg8d61ffa2013-05-10 12:32:47 +02001663 sdata_unlock(sdata);
Johannes Berg46900292009-02-15 12:44:28 +01001664}
1665
Johannes Berg1fa57d02010-06-10 10:21:32 +02001666void ieee80211_ibss_work(struct ieee80211_sub_if_data *sdata)
Johannes Berg46900292009-02-15 12:44:28 +01001667{
Johannes Berg1fa57d02010-06-10 10:21:32 +02001668 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
Johannes Berg8bf11d82011-12-15 11:17:37 +01001669 struct sta_info *sta;
Johannes Berg46900292009-02-15 12:44:28 +01001670
Johannes Berg8d61ffa2013-05-10 12:32:47 +02001671 sdata_lock(sdata);
Johannes Berg7a17a332010-07-21 11:30:27 +02001672
1673 /*
1674 * Work could be scheduled after scan or similar
1675 * when we aren't even joined (or trying) with a
1676 * network.
1677 */
1678 if (!ifibss->ssid_len)
1679 goto out;
Johannes Berg46900292009-02-15 12:44:28 +01001680
Johannes Berg8bf11d82011-12-15 11:17:37 +01001681 spin_lock_bh(&ifibss->incomplete_lock);
1682 while (!list_empty(&ifibss->incomplete_stations)) {
1683 sta = list_first_entry(&ifibss->incomplete_stations,
1684 struct sta_info, list);
1685 list_del(&sta->list);
1686 spin_unlock_bh(&ifibss->incomplete_lock);
1687
Antonio Quartulli52874a52013-06-18 14:20:40 +02001688 ieee80211_ibss_finish_sta(sta);
Johannes Berg8bf11d82011-12-15 11:17:37 +01001689 rcu_read_unlock();
1690 spin_lock_bh(&ifibss->incomplete_lock);
1691 }
1692 spin_unlock_bh(&ifibss->incomplete_lock);
1693
Johannes Berg46900292009-02-15 12:44:28 +01001694 switch (ifibss->state) {
1695 case IEEE80211_IBSS_MLME_SEARCH:
1696 ieee80211_sta_find_ibss(sdata);
1697 break;
1698 case IEEE80211_IBSS_MLME_JOINED:
1699 ieee80211_sta_merge_ibss(sdata);
1700 break;
1701 default:
1702 WARN_ON(1);
1703 break;
1704 }
Johannes Berg46900292009-02-15 12:44:28 +01001705
Johannes Berg7a17a332010-07-21 11:30:27 +02001706 out:
Johannes Berg8d61ffa2013-05-10 12:32:47 +02001707 sdata_unlock(sdata);
Johannes Berg3a4d4aa2010-05-26 16:41:40 +02001708}
1709
Johannes Berg46900292009-02-15 12:44:28 +01001710static void ieee80211_ibss_timer(unsigned long data)
1711{
1712 struct ieee80211_sub_if_data *sdata =
1713 (struct ieee80211_sub_if_data *) data;
Johannes Berg46900292009-02-15 12:44:28 +01001714
Stanislaw Gruszkaa6182942013-02-28 10:55:28 +01001715 ieee80211_queue_work(&sdata->local->hw, &sdata->work);
Johannes Berg46900292009-02-15 12:44:28 +01001716}
1717
1718void ieee80211_ibss_setup_sdata(struct ieee80211_sub_if_data *sdata)
1719{
1720 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1721
Johannes Berg46900292009-02-15 12:44:28 +01001722 setup_timer(&ifibss->timer, ieee80211_ibss_timer,
1723 (unsigned long) sdata);
Johannes Berg8bf11d82011-12-15 11:17:37 +01001724 INIT_LIST_HEAD(&ifibss->incomplete_stations);
1725 spin_lock_init(&ifibss->incomplete_lock);
Simon Wunderlichcd7760e2013-08-28 13:41:31 +02001726 INIT_WORK(&ifibss->csa_connection_drop_work,
1727 ieee80211_csa_connection_drop_work);
Johannes Berg46900292009-02-15 12:44:28 +01001728}
1729
1730/* scan finished notification */
1731void ieee80211_ibss_notify_scan_completed(struct ieee80211_local *local)
1732{
Johannes Bergaf8cdcd2009-04-19 21:25:43 +02001733 struct ieee80211_sub_if_data *sdata;
Johannes Berg46900292009-02-15 12:44:28 +01001734
Johannes Berg29b4a4f2009-04-21 00:30:49 +02001735 mutex_lock(&local->iflist_mtx);
1736 list_for_each_entry(sdata, &local->interfaces, list) {
Johannes Berg9607e6b2009-12-23 13:15:31 +01001737 if (!ieee80211_sdata_running(sdata))
Johannes Berg0e41f712009-04-23 11:48:56 +02001738 continue;
Johannes Bergaf8cdcd2009-04-19 21:25:43 +02001739 if (sdata->vif.type != NL80211_IFTYPE_ADHOC)
1740 continue;
1741 sdata->u.ibss.last_scan_completed = jiffies;
Johannes Berg46900292009-02-15 12:44:28 +01001742 }
Johannes Berg29b4a4f2009-04-21 00:30:49 +02001743 mutex_unlock(&local->iflist_mtx);
Johannes Berg46900292009-02-15 12:44:28 +01001744}
1745
Johannes Bergaf8cdcd2009-04-19 21:25:43 +02001746int ieee80211_ibss_join(struct ieee80211_sub_if_data *sdata,
1747 struct cfg80211_ibss_params *params)
1748{
Simon Wunderlichff3cc5f2011-11-30 16:56:33 +01001749 u32 changed = 0;
Simon Wunderlich2103dec2013-07-08 16:55:53 +02001750 u32 rate_flags;
1751 struct ieee80211_supported_band *sband;
Luciano Coelho71965c12014-02-18 17:07:53 +02001752 enum ieee80211_chanctx_mode chanmode;
1753 struct ieee80211_local *local = sdata->local;
1754 int radar_detect_width = 0;
Simon Wunderlich2103dec2013-07-08 16:55:53 +02001755 int i;
Luciano Coelho71965c12014-02-18 17:07:53 +02001756 int ret;
1757
1758 ret = cfg80211_chandef_dfs_required(local->hw.wiphy,
1759 &params->chandef,
1760 sdata->wdev.iftype);
1761 if (ret < 0)
1762 return ret;
1763
1764 if (ret > 0) {
1765 if (!params->userspace_handles_dfs)
1766 return -EINVAL;
1767 radar_detect_width = BIT(params->chandef.width);
1768 }
1769
1770 chanmode = (params->channel_fixed && !ret) ?
1771 IEEE80211_CHANCTX_SHARED : IEEE80211_CHANCTX_EXCLUSIVE;
1772
1773 mutex_lock(&local->chanctx_mtx);
1774 ret = ieee80211_check_combinations(sdata, &params->chandef, chanmode,
1775 radar_detect_width);
1776 mutex_unlock(&local->chanctx_mtx);
1777 if (ret < 0)
1778 return ret;
Johannes Bergaf8cdcd2009-04-19 21:25:43 +02001779
Johannes Bergaf8cdcd2009-04-19 21:25:43 +02001780 if (params->bssid) {
1781 memcpy(sdata->u.ibss.bssid, params->bssid, ETH_ALEN);
1782 sdata->u.ibss.fixed_bssid = true;
1783 } else
1784 sdata->u.ibss.fixed_bssid = false;
1785
Johannes Bergfffd0932009-07-08 14:22:54 +02001786 sdata->u.ibss.privacy = params->privacy;
Antonio Quartulli267335d2012-01-31 20:25:47 +01001787 sdata->u.ibss.control_port = params->control_port;
Simon Wunderlich8e8d3472013-10-07 18:41:06 +02001788 sdata->u.ibss.userspace_handles_dfs = params->userspace_handles_dfs;
Teemu Paasikivifbd2c8d2010-06-14 12:55:31 +03001789 sdata->u.ibss.basic_rates = params->basic_rates;
Krzysztof HaƂasac7d37a62014-05-26 14:14:46 +02001790 sdata->u.ibss.last_scan_completed = jiffies;
Simon Wunderlich2103dec2013-07-08 16:55:53 +02001791
1792 /* fix basic_rates if channel does not support these rates */
1793 rate_flags = ieee80211_chandef_rate_flags(&params->chandef);
Luciano Coelho71965c12014-02-18 17:07:53 +02001794 sband = local->hw.wiphy->bands[params->chandef.chan->band];
Simon Wunderlich2103dec2013-07-08 16:55:53 +02001795 for (i = 0; i < sband->n_bitrates; i++) {
1796 if ((rate_flags & sband->bitrates[i].flags) != rate_flags)
1797 sdata->u.ibss.basic_rates &= ~BIT(i);
1798 }
Felix Fietkaudd5b4cc2010-11-22 20:58:24 +01001799 memcpy(sdata->vif.bss_conf.mcast_rate, params->mcast_rate,
1800 sizeof(params->mcast_rate));
Johannes Bergfffd0932009-07-08 14:22:54 +02001801
Johannes Berg57c4d7b2009-04-23 16:10:04 +02001802 sdata->vif.bss_conf.beacon_int = params->beacon_interval;
1803
Simon Wunderlich3aede782013-05-16 13:00:36 +02001804 sdata->u.ibss.chandef = params->chandef;
Johannes Bergaf8cdcd2009-04-19 21:25:43 +02001805 sdata->u.ibss.fixed_channel = params->channel_fixed;
1806
1807 if (params->ie) {
1808 sdata->u.ibss.ie = kmemdup(params->ie, params->ie_len,
1809 GFP_KERNEL);
1810 if (sdata->u.ibss.ie)
1811 sdata->u.ibss.ie_len = params->ie_len;
1812 }
1813
Johannes Bergaf8cdcd2009-04-19 21:25:43 +02001814 sdata->u.ibss.state = IEEE80211_IBSS_MLME_SEARCH;
1815 sdata->u.ibss.ibss_join_req = jiffies;
1816
Antonio Quartullibadecb02012-10-26 18:54:25 +02001817 memcpy(sdata->u.ibss.ssid, params->ssid, params->ssid_len);
Johannes Berg0e41f712009-04-23 11:48:56 +02001818 sdata->u.ibss.ssid_len = params->ssid_len;
1819
Simon Wunderlich822854b2013-06-28 10:39:59 +02001820 memcpy(&sdata->u.ibss.ht_capa, &params->ht_capa,
1821 sizeof(sdata->u.ibss.ht_capa));
1822 memcpy(&sdata->u.ibss.ht_capa_mask, &params->ht_capa_mask,
1823 sizeof(sdata->u.ibss.ht_capa_mask));
1824
Simon Wunderlichff3cc5f2011-11-30 16:56:33 +01001825 /*
1826 * 802.11n-2009 9.13.3.1: In an IBSS, the HT Protection field is
1827 * reserved, but an HT STA shall protect HT transmissions as though
1828 * the HT Protection field were set to non-HT mixed mode.
1829 *
1830 * In an IBSS, the RIFS Mode field of the HT Operation element is
1831 * also reserved, but an HT STA shall operate as though this field
1832 * were set to 1.
1833 */
1834
1835 sdata->vif.bss_conf.ht_operation_mode |=
1836 IEEE80211_HT_OP_MODE_PROTECTION_NONHT_MIXED
1837 | IEEE80211_HT_PARAM_RIFS_MODE;
1838
1839 changed |= BSS_CHANGED_HT;
1840 ieee80211_bss_info_change_notify(sdata, changed);
1841
Johannes Berg04ecd252012-09-11 14:34:12 +02001842 sdata->smps_mode = IEEE80211_SMPS_OFF;
Luciano Coelho71965c12014-02-18 17:07:53 +02001843 sdata->needed_rx_chains = local->rx_chains;
Johannes Berg04ecd252012-09-11 14:34:12 +02001844
Luciano Coelho71965c12014-02-18 17:07:53 +02001845 ieee80211_queue_work(&local->hw, &sdata->work);
Johannes Bergaf8cdcd2009-04-19 21:25:43 +02001846
1847 return 0;
1848}
1849
1850int ieee80211_ibss_leave(struct ieee80211_sub_if_data *sdata)
1851{
Teemu Paasikivi5ea096c2010-06-14 12:55:33 +03001852 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
Johannes Berg7a17a332010-07-21 11:30:27 +02001853
Simon Wunderlich871a4182013-08-28 13:41:30 +02001854 ieee80211_ibss_disconnect(sdata);
Simon Wunderlichb78a4932012-11-13 18:43:03 +01001855 ifibss->ssid_len = 0;
Joe Perchesc84a67a2015-03-02 19:54:57 -08001856 eth_zero_addr(ifibss->bssid);
Johannes Bergaf8cdcd2009-04-19 21:25:43 +02001857
1858 /* remove beacon */
1859 kfree(sdata->u.ibss.ie);
Simon Wunderlich822854b2013-06-28 10:39:59 +02001860
1861 /* on the next join, re-program HT parameters */
1862 memset(&ifibss->ht_capa, 0, sizeof(ifibss->ht_capa));
1863 memset(&ifibss->ht_capa_mask, 0, sizeof(ifibss->ht_capa_mask));
1864
Johannes Bergaf8cdcd2009-04-19 21:25:43 +02001865 synchronize_rcu();
Johannes Bergaf8cdcd2009-04-19 21:25:43 +02001866
Johannes Berg35f20c12010-06-10 10:21:30 +02001867 skb_queue_purge(&sdata->skb_queue);
Johannes Berg5cff20e2009-04-29 12:26:17 +02001868
Johannes Bergbc05d192010-07-21 10:52:40 +02001869 del_timer_sync(&sdata->u.ibss.timer);
Johannes Berg7a17a332010-07-21 11:30:27 +02001870
Johannes Bergaf8cdcd2009-04-19 21:25:43 +02001871 return 0;
1872}