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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
Johannes Berg57fbcce2016-04-12 15:56:15 +0200129 if (sband->band == NL80211_BAND_2GHZ) {
Simon Wunderlichd51b70f2013-08-09 16:35:17 +0200130 *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 */
Johannes Berg57fbcce2016-04-12 15:56:15 +0200351 sdata->vif.bss_conf.use_short_slot = chan->band == NL80211_BAND_5GHZ;
Simon Wunderlich2f91a962012-12-03 22:21:30 +0100352 bss_change |= BSS_CHANGED_ERP_SLOT;
353
Simon Wunderlich2ec9c1f2013-07-11 18:07:46 +0200354 /* cf. IEEE 802.11 9.2.12 */
Johannes Berg57fbcce2016-04-12 15:56:15 +0200355 if (chan->band == NL80211_BAND_2GHZ && have_higher_than_11mbit)
Simon Wunderlich2ec9c1f2013-07-11 18:07:46 +0200356 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 Berg8bf11d82011-12-15 11:17:37 +0100652 /* make sure mandatory rates are always added */
Ashok Nagarajanb422c6c2013-05-10 17:50:51 -0700653 sband = local->hw.wiphy->bands[band];
Johannes Berg8bf11d82011-12-15 11:17:37 +0100654 sta->sta.supp_rates[band] = supp_rates |
Simon Wunderlich74608ac2013-07-08 16:55:54 +0200655 ieee80211_mandatory_rates(sband, scan_width);
Johannes Berg8bf11d82011-12-15 11:17:37 +0100656
Antonio Quartulli52874a52013-06-18 14:20:40 +0200657 return ieee80211_ibss_finish_sta(sta);
Antonio Quartulli6d810f12012-01-18 00:10:44 +0100658}
659
Simon Wunderlich871a4182013-08-28 13:41:30 +0200660static int ieee80211_sta_active_ibss(struct ieee80211_sub_if_data *sdata)
661{
662 struct ieee80211_local *local = sdata->local;
663 int active = 0;
664 struct sta_info *sta;
665
666 sdata_assert_lock(sdata);
667
668 rcu_read_lock();
669
670 list_for_each_entry_rcu(sta, &local->sta_list, list) {
Johannes Bergb8da6b62016-03-31 20:02:07 +0300671 unsigned long last_active = ieee80211_sta_last_active(sta);
672
Simon Wunderlich871a4182013-08-28 13:41:30 +0200673 if (sta->sdata == sdata &&
Johannes Bergb8da6b62016-03-31 20:02:07 +0300674 time_is_after_jiffies(last_active +
675 IEEE80211_IBSS_MERGE_INTERVAL)) {
Simon Wunderlich871a4182013-08-28 13:41:30 +0200676 active++;
677 break;
678 }
679 }
680
681 rcu_read_unlock();
682
683 return active;
684}
685
686static void ieee80211_ibss_disconnect(struct ieee80211_sub_if_data *sdata)
687{
688 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
689 struct ieee80211_local *local = sdata->local;
690 struct cfg80211_bss *cbss;
691 struct beacon_data *presp;
692 struct sta_info *sta;
Simon Wunderlich871a4182013-08-28 13:41:30 +0200693
Sujith Manoharand4c80d92014-01-30 14:17:28 +0530694 if (!is_zero_ether_addr(ifibss->bssid)) {
Simon Wunderlich871a4182013-08-28 13:41:30 +0200695 cbss = cfg80211_get_bss(local->hw.wiphy, ifibss->chandef.chan,
696 ifibss->bssid, ifibss->ssid,
Dedy Lansky6eb18132015-02-08 15:52:03 +0200697 ifibss->ssid_len,
698 IEEE80211_BSS_TYPE_IBSS,
699 IEEE80211_PRIVACY(ifibss->privacy));
Simon Wunderlich871a4182013-08-28 13:41:30 +0200700
701 if (cbss) {
702 cfg80211_unlink_bss(local->hw.wiphy, cbss);
703 cfg80211_put_bss(sdata->local->hw.wiphy, cbss);
704 }
705 }
706
707 ifibss->state = IEEE80211_IBSS_MLME_SEARCH;
708
709 sta_info_flush(sdata);
710
711 spin_lock_bh(&ifibss->incomplete_lock);
712 while (!list_empty(&ifibss->incomplete_stations)) {
713 sta = list_first_entry(&ifibss->incomplete_stations,
714 struct sta_info, list);
715 list_del(&sta->list);
716 spin_unlock_bh(&ifibss->incomplete_lock);
717
718 sta_info_free(local, sta);
719 spin_lock_bh(&ifibss->incomplete_lock);
720 }
721 spin_unlock_bh(&ifibss->incomplete_lock);
722
723 netif_carrier_off(sdata->dev);
724
725 sdata->vif.bss_conf.ibss_joined = false;
726 sdata->vif.bss_conf.ibss_creator = false;
727 sdata->vif.bss_conf.enable_beacon = false;
728 sdata->vif.bss_conf.ssid_len = 0;
729
730 /* remove beacon */
731 presp = rcu_dereference_protected(ifibss->presp,
732 lockdep_is_held(&sdata->wdev.mtx));
733 RCU_INIT_POINTER(sdata->u.ibss.presp, NULL);
734 if (presp)
735 kfree_rcu(presp, rcu_head);
736
737 clear_bit(SDATA_STATE_OFFCHANNEL_BEACON_STOPPED, &sdata->state);
738 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BEACON_ENABLED |
739 BSS_CHANGED_IBSS);
Johannes Berg55fff502013-08-19 18:48:41 +0200740 drv_leave_ibss(local, sdata);
Johannes Berg34a37402013-12-18 09:43:33 +0100741 mutex_lock(&local->mtx);
Simon Wunderlich871a4182013-08-28 13:41:30 +0200742 ieee80211_vif_release_channel(sdata);
Johannes Berg34a37402013-12-18 09:43:33 +0100743 mutex_unlock(&local->mtx);
Simon Wunderlich871a4182013-08-28 13:41:30 +0200744}
745
Simon Wunderlichcd7760e2013-08-28 13:41:31 +0200746static void ieee80211_csa_connection_drop_work(struct work_struct *work)
747{
748 struct ieee80211_sub_if_data *sdata =
749 container_of(work, struct ieee80211_sub_if_data,
750 u.ibss.csa_connection_drop_work);
751
Luciano Coelho6f07d212013-12-11 20:39:46 +0200752 sdata_lock(sdata);
753
Simon Wunderlichcd7760e2013-08-28 13:41:31 +0200754 ieee80211_ibss_disconnect(sdata);
755 synchronize_rcu();
756 skb_queue_purge(&sdata->skb_queue);
757
758 /* trigger a scan to find another IBSS network to join */
759 ieee80211_queue_work(&sdata->local->hw, &sdata->work);
Luciano Coelho6f07d212013-12-11 20:39:46 +0200760
761 sdata_unlock(sdata);
Simon Wunderlichcd7760e2013-08-28 13:41:31 +0200762}
763
Simon Wunderlich8e8d3472013-10-07 18:41:06 +0200764static void ieee80211_ibss_csa_mark_radar(struct ieee80211_sub_if_data *sdata)
765{
766 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
767 int err;
768
769 /* if the current channel is a DFS channel, mark the channel as
770 * unavailable.
771 */
772 err = cfg80211_chandef_dfs_required(sdata->local->hw.wiphy,
Luciano Coelho2beb6dab2014-02-18 11:40:36 +0200773 &ifibss->chandef,
774 NL80211_IFTYPE_ADHOC);
Simon Wunderlich8e8d3472013-10-07 18:41:06 +0200775 if (err > 0)
776 cfg80211_radar_event(sdata->local->hw.wiphy, &ifibss->chandef,
777 GFP_ATOMIC);
778}
779
Simon Wunderlichcd7760e2013-08-28 13:41:31 +0200780static bool
781ieee80211_ibss_process_chanswitch(struct ieee80211_sub_if_data *sdata,
782 struct ieee802_11_elems *elems,
783 bool beacon)
784{
785 struct cfg80211_csa_settings params;
Chun-Yeow Yeohc0f17eb2013-10-14 19:08:29 -0700786 struct ieee80211_csa_ie csa_ie;
Simon Wunderlichcd7760e2013-08-28 13:41:31 +0200787 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
Simon Wunderlichcd7760e2013-08-28 13:41:31 +0200788 enum nl80211_channel_type ch_type;
Luciano Coelho82a8e172013-12-13 21:13:50 +0200789 int err;
Simon Wunderlichcd7760e2013-08-28 13:41:31 +0200790 u32 sta_flags;
Simon Wunderlichcd7760e2013-08-28 13:41:31 +0200791
Michal Kaziordbd72852014-01-29 07:56:21 +0100792 sdata_assert_lock(sdata);
793
Simon Wunderlichcd7760e2013-08-28 13:41:31 +0200794 sta_flags = IEEE80211_STA_DISABLE_VHT;
795 switch (ifibss->chandef.width) {
796 case NL80211_CHAN_WIDTH_5:
797 case NL80211_CHAN_WIDTH_10:
798 case NL80211_CHAN_WIDTH_20_NOHT:
799 sta_flags |= IEEE80211_STA_DISABLE_HT;
800 /* fall through */
801 case NL80211_CHAN_WIDTH_20:
802 sta_flags |= IEEE80211_STA_DISABLE_40MHZ;
803 break;
804 default:
805 break;
806 }
807
808 memset(&params, 0, sizeof(params));
Chun-Yeow Yeohc0f17eb2013-10-14 19:08:29 -0700809 memset(&csa_ie, 0, sizeof(csa_ie));
Luciano Coelho84469a42014-10-28 13:33:04 +0200810 err = ieee80211_parse_ch_switch_ie(sdata, elems,
Simon Wunderlichcd7760e2013-08-28 13:41:31 +0200811 ifibss->chandef.chan->band,
Chun-Yeow Yeohc0f17eb2013-10-14 19:08:29 -0700812 sta_flags, ifibss->bssid, &csa_ie);
Simon Wunderlichcd7760e2013-08-28 13:41:31 +0200813 /* can't switch to destination channel, fail */
814 if (err < 0)
815 goto disconnect;
816
817 /* did not contain a CSA */
818 if (err)
819 return false;
820
Simon Wunderlich0834ae32013-11-26 16:45:18 +0100821 /* channel switch is not supported, disconnect */
822 if (!(sdata->local->hw.wiphy->flags & WIPHY_FLAG_HAS_CHANNEL_SWITCH))
823 goto disconnect;
824
Chun-Yeow Yeohc0f17eb2013-10-14 19:08:29 -0700825 params.count = csa_ie.count;
826 params.chandef = csa_ie.chandef;
827
Simon Wunderlichcd7760e2013-08-28 13:41:31 +0200828 switch (ifibss->chandef.width) {
829 case NL80211_CHAN_WIDTH_20_NOHT:
830 case NL80211_CHAN_WIDTH_20:
831 case NL80211_CHAN_WIDTH_40:
832 /* keep our current HT mode (HT20/HT40+/HT40-), even if
833 * another mode has been announced. The mode is not adopted
834 * within the beacon while doing CSA and we should therefore
835 * keep the mode which we announce.
836 */
837 ch_type = cfg80211_get_chandef_type(&ifibss->chandef);
838 cfg80211_chandef_create(&params.chandef, params.chandef.chan,
839 ch_type);
840 break;
841 case NL80211_CHAN_WIDTH_5:
842 case NL80211_CHAN_WIDTH_10:
843 if (params.chandef.width != ifibss->chandef.width) {
844 sdata_info(sdata,
845 "IBSS %pM received channel switch from incompatible channel width (%d MHz, width:%d, CF1/2: %d/%d MHz), disconnecting\n",
846 ifibss->bssid,
847 params.chandef.chan->center_freq,
848 params.chandef.width,
849 params.chandef.center_freq1,
850 params.chandef.center_freq2);
851 goto disconnect;
852 }
853 break;
854 default:
855 /* should not happen, sta_flags should prevent VHT modes. */
856 WARN_ON(1);
857 goto disconnect;
858 }
859
Ilan Peer174e0cd2014-02-23 09:13:01 +0200860 if (!cfg80211_reg_can_beacon(sdata->local->hw.wiphy, &params.chandef,
861 NL80211_IFTYPE_ADHOC)) {
Simon Wunderlichcd7760e2013-08-28 13:41:31 +0200862 sdata_info(sdata,
863 "IBSS %pM switches to unsupported channel (%d MHz, width:%d, CF1/2: %d/%d MHz), disconnecting\n",
864 ifibss->bssid,
865 params.chandef.chan->center_freq,
866 params.chandef.width,
867 params.chandef.center_freq1,
868 params.chandef.center_freq2);
869 goto disconnect;
870 }
871
872 err = cfg80211_chandef_dfs_required(sdata->local->hw.wiphy,
Luciano Coelho2beb6dab2014-02-18 11:40:36 +0200873 &params.chandef,
874 NL80211_IFTYPE_ADHOC);
Simon Wunderlichcd7760e2013-08-28 13:41:31 +0200875 if (err < 0)
876 goto disconnect;
Luciano Coelho2beb6dab2014-02-18 11:40:36 +0200877 if (err > 0 && !ifibss->userspace_handles_dfs) {
Simon Wunderlich8e8d3472013-10-07 18:41:06 +0200878 /* IBSS-DFS only allowed with a control program */
Luciano Coelho2beb6dab2014-02-18 11:40:36 +0200879 goto disconnect;
Simon Wunderlichcd7760e2013-08-28 13:41:31 +0200880 }
881
Luciano Coelho2beb6dab2014-02-18 11:40:36 +0200882 params.radar_required = err;
883
Luciano Coelho82a8e172013-12-13 21:13:50 +0200884 if (cfg80211_chandef_identical(&params.chandef,
885 &sdata->vif.bss_conf.chandef)) {
886 ibss_dbg(sdata,
887 "received csa with an identical chandef, ignoring\n");
888 return true;
Simon Wunderlichcd7760e2013-08-28 13:41:31 +0200889 }
890
Simon Wunderlichcd7760e2013-08-28 13:41:31 +0200891 /* all checks done, now perform the channel switch. */
892 ibss_dbg(sdata,
893 "received channel switch announcement to go to channel %d MHz\n",
894 params.chandef.chan->center_freq);
895
Chun-Yeow Yeohc0f17eb2013-10-14 19:08:29 -0700896 params.block_tx = !!csa_ie.mode;
Simon Wunderlichcd7760e2013-08-28 13:41:31 +0200897
Luciano Coelho82a8e172013-12-13 21:13:50 +0200898 if (ieee80211_channel_switch(sdata->local->hw.wiphy, sdata->dev,
899 &params))
900 goto disconnect;
Simon Wunderlichcd7760e2013-08-28 13:41:31 +0200901
Simon Wunderlich8e8d3472013-10-07 18:41:06 +0200902 ieee80211_ibss_csa_mark_radar(sdata);
903
Simon Wunderlichcd7760e2013-08-28 13:41:31 +0200904 return true;
905disconnect:
906 ibss_dbg(sdata, "Can't handle channel switch, disconnect\n");
907 ieee80211_queue_work(&sdata->local->hw,
908 &ifibss->csa_connection_drop_work);
909
Simon Wunderlich8e8d3472013-10-07 18:41:06 +0200910 ieee80211_ibss_csa_mark_radar(sdata);
911
Simon Wunderlichcd7760e2013-08-28 13:41:31 +0200912 return true;
913}
914
915static void
916ieee80211_rx_mgmt_spectrum_mgmt(struct ieee80211_sub_if_data *sdata,
917 struct ieee80211_mgmt *mgmt, size_t len,
918 struct ieee80211_rx_status *rx_status,
919 struct ieee802_11_elems *elems)
920{
921 int required_len;
922
923 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
924 return;
925
926 /* CSA is the only action we handle for now */
927 if (mgmt->u.action.u.measurement.action_code !=
928 WLAN_ACTION_SPCT_CHL_SWITCH)
929 return;
930
931 required_len = IEEE80211_MIN_ACTION_SIZE +
932 sizeof(mgmt->u.action.u.chan_switch);
933 if (len < required_len)
934 return;
935
Luciano Coelho82a8e172013-12-13 21:13:50 +0200936 if (!sdata->vif.csa_active)
937 ieee80211_ibss_process_chanswitch(sdata, elems, false);
Simon Wunderlichcd7760e2013-08-28 13:41:31 +0200938}
939
Antonio Quartulli2cc59e72012-09-07 13:28:53 +0200940static void ieee80211_rx_mgmt_deauth_ibss(struct ieee80211_sub_if_data *sdata,
941 struct ieee80211_mgmt *mgmt,
942 size_t len)
943{
944 u16 reason = le16_to_cpu(mgmt->u.deauth.reason_code);
945
946 if (len < IEEE80211_DEAUTH_FRAME_LEN)
947 return;
948
949 ibss_dbg(sdata, "RX DeAuth SA=%pM DA=%pM BSSID=%pM (reason: %d)\n",
950 mgmt->sa, mgmt->da, mgmt->bssid, reason);
951 sta_info_destroy_addr(sdata, mgmt->sa);
952}
953
Antonio Quartulli6d810f12012-01-18 00:10:44 +0100954static void ieee80211_rx_mgmt_auth_ibss(struct ieee80211_sub_if_data *sdata,
955 struct ieee80211_mgmt *mgmt,
956 size_t len)
957{
958 u16 auth_alg, auth_transaction;
959
Johannes Berg8d61ffa2013-05-10 12:32:47 +0200960 sdata_assert_lock(sdata);
Antonio Quartulli6d810f12012-01-18 00:10:44 +0100961
962 if (len < 24 + 6)
963 return;
964
965 auth_alg = le16_to_cpu(mgmt->u.auth.auth_alg);
966 auth_transaction = le16_to_cpu(mgmt->u.auth.auth_transaction);
967
Johannes Bergbdcbd8e2012-06-22 11:29:50 +0200968 ibss_dbg(sdata,
969 "RX Auth SA=%pM DA=%pM BSSID=%pM (auth_transaction=%d)\n",
970 mgmt->sa, mgmt->da, mgmt->bssid, auth_transaction);
Antonio Quartulli7bed2052012-11-25 23:24:27 +0100971
972 if (auth_alg != WLAN_AUTH_OPEN || auth_transaction != 1)
973 return;
974
Antonio Quartulli2cc59e72012-09-07 13:28:53 +0200975 /*
Antonio Quartulli6d810f12012-01-18 00:10:44 +0100976 * IEEE 802.11 standard does not require authentication in IBSS
977 * networks and most implementations do not seem to use it.
978 * However, try to reply to authentication attempts if someone
979 * has actually implemented this.
980 */
Jouni Malinen700e8ea2012-09-30 19:29:37 +0300981 ieee80211_send_auth(sdata, 2, WLAN_AUTH_OPEN, 0, NULL, 0,
Johannes Berg1672c0e32013-01-29 15:02:27 +0100982 mgmt->sa, sdata->u.ibss.bssid, NULL, 0, 0, 0);
Johannes Berg8bf11d82011-12-15 11:17:37 +0100983}
984
Janusz.Dziedzic@tieto.com8a4988d2015-03-09 07:58:15 +0100985static void ieee80211_update_sta_info(struct ieee80211_sub_if_data *sdata,
986 struct ieee80211_mgmt *mgmt, size_t len,
987 struct ieee80211_rx_status *rx_status,
988 struct ieee802_11_elems *elems,
989 struct ieee80211_channel *channel)
990{
991 struct sta_info *sta;
Johannes Berg57fbcce2016-04-12 15:56:15 +0200992 enum nl80211_band band = rx_status->band;
Janusz.Dziedzic@tieto.com8a4988d2015-03-09 07:58:15 +0100993 enum nl80211_bss_scan_width scan_width;
994 struct ieee80211_local *local = sdata->local;
995 struct ieee80211_supported_band *sband = local->hw.wiphy->bands[band];
996 bool rates_updated = false;
997 u32 supp_rates = 0;
998
999 if (sdata->vif.type != NL80211_IFTYPE_ADHOC)
1000 return;
1001
1002 if (!ether_addr_equal(mgmt->bssid, sdata->u.ibss.bssid))
1003 return;
1004
1005 rcu_read_lock();
1006 sta = sta_info_get(sdata, mgmt->sa);
1007
1008 if (elems->supp_rates) {
1009 supp_rates = ieee80211_sta_get_rates(sdata, elems,
1010 band, NULL);
1011 if (sta) {
1012 u32 prev_rates;
1013
1014 prev_rates = sta->sta.supp_rates[band];
1015 /* make sure mandatory rates are always added */
1016 scan_width = NL80211_BSS_CHAN_WIDTH_20;
1017 if (rx_status->flag & RX_FLAG_5MHZ)
1018 scan_width = NL80211_BSS_CHAN_WIDTH_5;
1019 if (rx_status->flag & RX_FLAG_10MHZ)
1020 scan_width = NL80211_BSS_CHAN_WIDTH_10;
1021
1022 sta->sta.supp_rates[band] = supp_rates |
1023 ieee80211_mandatory_rates(sband, scan_width);
1024 if (sta->sta.supp_rates[band] != prev_rates) {
1025 ibss_dbg(sdata,
1026 "updated supp_rates set for %pM based on beacon/probe_resp (0x%x -> 0x%x)\n",
1027 sta->sta.addr, prev_rates,
1028 sta->sta.supp_rates[band]);
1029 rates_updated = true;
1030 }
1031 } else {
1032 rcu_read_unlock();
1033 sta = ieee80211_ibss_add_sta(sdata, mgmt->bssid,
1034 mgmt->sa, supp_rates);
1035 }
1036 }
1037
Johannes Berg96a4688e2015-05-11 14:01:36 +02001038 if (sta && !sta->sta.wme &&
1039 elems->wmm_info && local->hw.queues >= IEEE80211_NUM_ACS) {
Janusz.Dziedzic@tieto.com8a4988d2015-03-09 07:58:15 +01001040 sta->sta.wme = true;
Johannes Berg96a4688e2015-05-11 14:01:36 +02001041 ieee80211_check_fast_xmit(sta);
1042 }
Janusz.Dziedzic@tieto.com8a4988d2015-03-09 07:58:15 +01001043
1044 if (sta && elems->ht_operation && elems->ht_cap_elem &&
1045 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) {
1048 /* we both use HT */
1049 struct ieee80211_ht_cap htcap_ie;
1050 struct cfg80211_chan_def chandef;
Janusz.Dziedzic@tieto.comabcff6e2015-03-20 06:37:01 +01001051 enum ieee80211_sta_rx_bandwidth bw = sta->sta.bandwidth;
Janusz.Dziedzic@tieto.com8a4988d2015-03-09 07:58:15 +01001052
Johannes Berg8ac3c7042015-12-18 15:08:34 +01001053 cfg80211_chandef_create(&chandef, channel, NL80211_CHAN_NO_HT);
1054 ieee80211_chandef_ht_oper(elems->ht_operation, &chandef);
Janusz.Dziedzic@tieto.com8a4988d2015-03-09 07:58:15 +01001055
1056 memcpy(&htcap_ie, elems->ht_cap_elem, sizeof(htcap_ie));
Janusz.Dziedzic@tieto.com8a4988d2015-03-09 07:58:15 +01001057 rates_updated |= ieee80211_ht_cap_ie_to_sta_ht_cap(sdata, sband,
1058 &htcap_ie,
1059 sta);
Janusz.Dziedzic@tieto.comabcff6e2015-03-20 06:37:01 +01001060
1061 if (elems->vht_operation && elems->vht_cap_elem &&
1062 sdata->u.ibss.chandef.width != NL80211_CHAN_WIDTH_20 &&
1063 sdata->u.ibss.chandef.width != NL80211_CHAN_WIDTH_40) {
1064 /* we both use VHT */
1065 struct ieee80211_vht_cap cap_ie;
1066 struct ieee80211_sta_vht_cap cap = sta->sta.vht_cap;
1067
Johannes Berg8ac3c7042015-12-18 15:08:34 +01001068 ieee80211_chandef_vht_oper(elems->vht_operation,
1069 &chandef);
Janusz.Dziedzic@tieto.comabcff6e2015-03-20 06:37:01 +01001070 memcpy(&cap_ie, elems->vht_cap_elem, sizeof(cap_ie));
1071 ieee80211_vht_cap_ie_to_sta_vht_cap(sdata, sband,
1072 &cap_ie, sta);
1073 if (memcmp(&cap, &sta->sta.vht_cap, sizeof(cap)))
1074 rates_updated |= true;
1075 }
1076
1077 if (bw != sta->sta.bandwidth)
1078 rates_updated |= true;
1079
1080 if (!cfg80211_chandef_compatible(&sdata->u.ibss.chandef,
1081 &chandef))
1082 WARN_ON_ONCE(1);
Janusz.Dziedzic@tieto.com8a4988d2015-03-09 07:58:15 +01001083 }
1084
1085 if (sta && rates_updated) {
1086 u32 changed = IEEE80211_RC_SUPP_RATES_CHANGED;
1087 u8 rx_nss = sta->sta.rx_nss;
1088
1089 /* Force rx_nss recalculation */
1090 sta->sta.rx_nss = 0;
1091 rate_control_rate_init(sta);
1092 if (sta->sta.rx_nss != rx_nss)
1093 changed |= IEEE80211_RC_NSS_CHANGED;
1094
1095 drv_sta_rc_update(local, sdata, &sta->sta, changed);
1096 }
1097
1098 rcu_read_unlock();
1099}
1100
Johannes Berg46900292009-02-15 12:44:28 +01001101static void ieee80211_rx_bss_info(struct ieee80211_sub_if_data *sdata,
Emmanuel Grumbachd45c4172012-12-10 16:19:13 +02001102 struct ieee80211_mgmt *mgmt, size_t len,
Johannes Berg46900292009-02-15 12:44:28 +01001103 struct ieee80211_rx_status *rx_status,
Emmanuel Grumbachd45c4172012-12-10 16:19:13 +02001104 struct ieee802_11_elems *elems)
Johannes Berg46900292009-02-15 12:44:28 +01001105{
1106 struct ieee80211_local *local = sdata->local;
Johannes Berg0c1ad2c2009-12-23 13:15:39 +01001107 struct cfg80211_bss *cbss;
Johannes Berg46900292009-02-15 12:44:28 +01001108 struct ieee80211_bss *bss;
Johannes Berg46900292009-02-15 12:44:28 +01001109 struct ieee80211_channel *channel;
1110 u64 beacon_timestamp, rx_timestamp;
1111 u32 supp_rates = 0;
Johannes Berg57fbcce2016-04-12 15:56:15 +02001112 enum nl80211_band band = rx_status->band;
Johannes Berg46900292009-02-15 12:44:28 +01001113
Emmanuel Grumbach3afc2162014-03-04 16:50:13 +02001114 channel = ieee80211_get_channel(local->hw.wiphy, rx_status->freq);
1115 if (!channel)
Johannes Berg46900292009-02-15 12:44:28 +01001116 return;
1117
Janusz.Dziedzic@tieto.com8a4988d2015-03-09 07:58:15 +01001118 ieee80211_update_sta_info(sdata, mgmt, len, rx_status, elems, channel);
Johannes Berg46900292009-02-15 12:44:28 +01001119
1120 bss = ieee80211_bss_info_update(local, rx_status, mgmt, len, elems,
Emmanuel Grumbachd45c4172012-12-10 16:19:13 +02001121 channel);
Johannes Berg46900292009-02-15 12:44:28 +01001122 if (!bss)
1123 return;
1124
Johannes Berg0c1ad2c2009-12-23 13:15:39 +01001125 cbss = container_of((void *)bss, struct cfg80211_bss, priv);
1126
Johannes Berg8cef2c92013-02-05 16:54:31 +01001127 /* same for beacon and probe response */
1128 beacon_timestamp = le64_to_cpu(mgmt->u.beacon.timestamp);
Johannes Berg46900292009-02-15 12:44:28 +01001129
1130 /* check if we need to merge IBSS */
1131
Johannes Berg46900292009-02-15 12:44:28 +01001132 /* not an IBSS */
Johannes Berg0c1ad2c2009-12-23 13:15:39 +01001133 if (!(cbss->capability & WLAN_CAPABILITY_IBSS))
Johannes Berg46900292009-02-15 12:44:28 +01001134 goto put_bss;
1135
1136 /* different channel */
Johannes Berg55de9082012-07-26 17:24:39 +02001137 if (sdata->u.ibss.fixed_channel &&
Simon Wunderlich3aede782013-05-16 13:00:36 +02001138 sdata->u.ibss.chandef.chan != cbss->channel)
Johannes Berg46900292009-02-15 12:44:28 +01001139 goto put_bss;
1140
1141 /* different SSID */
1142 if (elems->ssid_len != sdata->u.ibss.ssid_len ||
1143 memcmp(elems->ssid, sdata->u.ibss.ssid,
1144 sdata->u.ibss.ssid_len))
1145 goto put_bss;
1146
Simon Wunderlichcd7760e2013-08-28 13:41:31 +02001147 /* process channel switch */
Luciano Coelho82a8e172013-12-13 21:13:50 +02001148 if (sdata->vif.csa_active ||
1149 ieee80211_ibss_process_chanswitch(sdata, elems, true))
Simon Wunderlichcd7760e2013-08-28 13:41:31 +02001150 goto put_bss;
1151
Alina Friedrichsen34e8f082009-02-22 00:07:28 +01001152 /* same BSSID */
Joe Perchesb203ca32012-05-08 18:56:52 +00001153 if (ether_addr_equal(cbss->bssid, sdata->u.ibss.bssid))
Alina Friedrichsen34e8f082009-02-22 00:07:28 +01001154 goto put_bss;
1155
Simon Wunderlichcd7760e2013-08-28 13:41:31 +02001156 /* we use a fixed BSSID */
1157 if (sdata->u.ibss.fixed_bssid)
1158 goto put_bss;
1159
Thomas Pedersenf4bda332012-11-13 10:46:27 -08001160 if (ieee80211_have_rx_timestamp(rx_status)) {
1161 /* time when timestamp field was received */
1162 rx_timestamp =
1163 ieee80211_calculate_rx_timestamp(local, rx_status,
1164 len + FCS_LEN, 24);
Johannes Berg24487982009-04-23 18:52:52 +02001165 } else {
1166 /*
1167 * second best option: get current TSF
1168 * (will return -1 if not supported)
1169 */
Eliad Peller37a41b42011-09-21 14:06:11 +03001170 rx_timestamp = drv_get_tsf(local, sdata);
Johannes Berg24487982009-04-23 18:52:52 +02001171 }
Johannes Berg46900292009-02-15 12:44:28 +01001172
Johannes Bergbdcbd8e2012-06-22 11:29:50 +02001173 ibss_dbg(sdata,
1174 "RX beacon SA=%pM BSSID=%pM TSF=0x%llx BCN=0x%llx diff=%lld @%lu\n",
1175 mgmt->sa, mgmt->bssid,
1176 (unsigned long long)rx_timestamp,
1177 (unsigned long long)beacon_timestamp,
1178 (unsigned long long)(rx_timestamp - beacon_timestamp),
1179 jiffies);
Johannes Berg46900292009-02-15 12:44:28 +01001180
1181 if (beacon_timestamp > rx_timestamp) {
Johannes Bergbdcbd8e2012-06-22 11:29:50 +02001182 ibss_dbg(sdata,
1183 "beacon TSF higher than local TSF - IBSS merge with BSSID %pM\n",
1184 mgmt->bssid);
Johannes Berg46900292009-02-15 12:44:28 +01001185 ieee80211_sta_join_ibss(sdata, bss);
Simon Wunderlich2103dec2013-07-08 16:55:53 +02001186 supp_rates = ieee80211_sta_get_rates(sdata, elems, band, NULL);
Johannes Berg34e89502010-02-03 13:59:58 +01001187 ieee80211_ibss_add_sta(sdata, mgmt->bssid, mgmt->sa,
Antonio Quartulli52874a52013-06-18 14:20:40 +02001188 supp_rates);
Johannes Berg8bf11d82011-12-15 11:17:37 +01001189 rcu_read_unlock();
Johannes Berg46900292009-02-15 12:44:28 +01001190 }
1191
1192 put_bss:
1193 ieee80211_rx_bss_put(local, bss);
1194}
1195
Johannes Berg8bf11d82011-12-15 11:17:37 +01001196void ieee80211_ibss_rx_no_sta(struct ieee80211_sub_if_data *sdata,
1197 const u8 *bssid, const u8 *addr,
1198 u32 supp_rates)
Johannes Berg46900292009-02-15 12:44:28 +01001199{
Felix Fietkau2e10d332009-12-20 19:07:09 +01001200 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
Johannes Berg46900292009-02-15 12:44:28 +01001201 struct ieee80211_local *local = sdata->local;
1202 struct sta_info *sta;
Johannes Berg55de9082012-07-26 17:24:39 +02001203 struct ieee80211_chanctx_conf *chanctx_conf;
Ashok Nagarajanb422c6c2013-05-10 17:50:51 -07001204 struct ieee80211_supported_band *sband;
Simon Wunderlich74608ac2013-07-08 16:55:54 +02001205 enum nl80211_bss_scan_width scan_width;
Johannes Berg55de9082012-07-26 17:24:39 +02001206 int band;
Johannes Berg46900292009-02-15 12:44:28 +01001207
Johannes Bergaf8cdcd2009-04-19 21:25:43 +02001208 /*
1209 * XXX: Consider removing the least recently used entry and
1210 * allow new one to be added.
1211 */
Johannes Berg46900292009-02-15 12:44:28 +01001212 if (local->num_sta >= IEEE80211_IBSS_MAX_STA_ENTRIES) {
Johannes Bergbdcbd8e2012-06-22 11:29:50 +02001213 net_info_ratelimited("%s: No room for a new IBSS STA entry %pM\n",
Joe Perchese87cc472012-05-13 21:56:26 +00001214 sdata->name, addr);
Johannes Berg8bf11d82011-12-15 11:17:37 +01001215 return;
Johannes Berg46900292009-02-15 12:44:28 +01001216 }
1217
Felix Fietkau2e10d332009-12-20 19:07:09 +01001218 if (ifibss->state == IEEE80211_IBSS_MLME_SEARCH)
Johannes Berg8bf11d82011-12-15 11:17:37 +01001219 return;
Felix Fietkau2e10d332009-12-20 19:07:09 +01001220
Joe Perchesb203ca32012-05-08 18:56:52 +00001221 if (!ether_addr_equal(bssid, sdata->u.ibss.bssid))
Johannes Berg8bf11d82011-12-15 11:17:37 +01001222 return;
Johannes Berg46900292009-02-15 12:44:28 +01001223
Johannes Berg55de9082012-07-26 17:24:39 +02001224 rcu_read_lock();
1225 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
1226 if (WARN_ON_ONCE(!chanctx_conf)) {
1227 rcu_read_unlock();
1228 return;
1229 }
Johannes Berg4bf88532012-11-09 11:39:59 +01001230 band = chanctx_conf->def.chan->band;
Simon Wunderlich74608ac2013-07-08 16:55:54 +02001231 scan_width = cfg80211_chandef_to_scan_width(&chanctx_conf->def);
Johannes Berg55de9082012-07-26 17:24:39 +02001232 rcu_read_unlock();
1233
Johannes Berg8bf11d82011-12-15 11:17:37 +01001234 sta = sta_info_alloc(sdata, addr, GFP_ATOMIC);
Johannes Berg46900292009-02-15 12:44:28 +01001235 if (!sta)
Johannes Berg8bf11d82011-12-15 11:17:37 +01001236 return;
Johannes Berg46900292009-02-15 12:44:28 +01001237
Johannes Berg46900292009-02-15 12:44:28 +01001238 /* make sure mandatory rates are always added */
Ashok Nagarajanb422c6c2013-05-10 17:50:51 -07001239 sband = local->hw.wiphy->bands[band];
Johannes Berg46900292009-02-15 12:44:28 +01001240 sta->sta.supp_rates[band] = supp_rates |
Simon Wunderlich74608ac2013-07-08 16:55:54 +02001241 ieee80211_mandatory_rates(sband, scan_width);
Johannes Berg46900292009-02-15 12:44:28 +01001242
Johannes Berg8bf11d82011-12-15 11:17:37 +01001243 spin_lock(&ifibss->incomplete_lock);
1244 list_add(&sta->list, &ifibss->incomplete_stations);
1245 spin_unlock(&ifibss->incomplete_lock);
1246 ieee80211_queue_work(&local->hw, &sdata->work);
Johannes Berg46900292009-02-15 12:44:28 +01001247}
1248
Antonio Quartullidad9def2013-07-26 21:15:02 +02001249static void ieee80211_ibss_sta_expire(struct ieee80211_sub_if_data *sdata)
1250{
1251 struct ieee80211_local *local = sdata->local;
1252 struct sta_info *sta, *tmp;
1253 unsigned long exp_time = IEEE80211_IBSS_INACTIVITY_LIMIT;
Johannes Berge5a9f8d2015-10-16 17:54:47 +02001254 unsigned long exp_rsn = IEEE80211_IBSS_RSN_INACTIVITY_LIMIT;
Antonio Quartullidad9def2013-07-26 21:15:02 +02001255
1256 mutex_lock(&local->sta_mtx);
1257
1258 list_for_each_entry_safe(sta, tmp, &local->sta_list, list) {
Johannes Bergb8da6b62016-03-31 20:02:07 +03001259 unsigned long last_active = ieee80211_sta_last_active(sta);
1260
Antonio Quartullidad9def2013-07-26 21:15:02 +02001261 if (sdata != sta->sdata)
1262 continue;
1263
Johannes Bergb8da6b62016-03-31 20:02:07 +03001264 if (time_is_before_jiffies(last_active + exp_time) ||
1265 (time_is_before_jiffies(last_active + exp_rsn) &&
Antonio Quartullidad9def2013-07-26 21:15:02 +02001266 sta->sta_state != IEEE80211_STA_AUTHORIZED)) {
1267 sta_dbg(sta->sdata, "expiring inactive %sSTA %pM\n",
1268 sta->sta_state != IEEE80211_STA_AUTHORIZED ?
1269 "not authorized " : "", sta->sta.addr);
1270
1271 WARN_ON(__sta_info_destroy(sta));
1272 }
1273 }
1274
1275 mutex_unlock(&local->sta_mtx);
1276}
1277
Benoit Papillaultce9058a2010-01-17 22:45:23 +01001278/*
1279 * This function is called with state == IEEE80211_IBSS_MLME_JOINED
1280 */
Johannes Berg46900292009-02-15 12:44:28 +01001281
1282static void ieee80211_sta_merge_ibss(struct ieee80211_sub_if_data *sdata)
1283{
1284 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
Simon Wunderlich7ca15a02013-07-08 16:55:56 +02001285 enum nl80211_bss_scan_width scan_width;
Johannes Berg46900292009-02-15 12:44:28 +01001286
Johannes Berg8d61ffa2013-05-10 12:32:47 +02001287 sdata_assert_lock(sdata);
Johannes Berg7a17a332010-07-21 11:30:27 +02001288
Johannes Bergaf8cdcd2009-04-19 21:25:43 +02001289 mod_timer(&ifibss->timer,
1290 round_jiffies(jiffies + IEEE80211_IBSS_MERGE_INTERVAL));
Johannes Berg46900292009-02-15 12:44:28 +01001291
Antonio Quartullidad9def2013-07-26 21:15:02 +02001292 ieee80211_ibss_sta_expire(sdata);
Johannes Bergaf8cdcd2009-04-19 21:25:43 +02001293
Sujith450aae32009-11-02 12:33:23 +05301294 if (time_before(jiffies, ifibss->last_scan_completed +
1295 IEEE80211_IBSS_MERGE_INTERVAL))
1296 return;
1297
Johannes Berg46900292009-02-15 12:44:28 +01001298 if (ieee80211_sta_active_ibss(sdata))
1299 return;
1300
John W. Linvillec037b832012-01-30 15:28:11 -05001301 if (ifibss->fixed_channel)
Johannes Berg46900292009-02-15 12:44:28 +01001302 return;
1303
Johannes Bergbdcbd8e2012-06-22 11:29:50 +02001304 sdata_info(sdata,
1305 "No active IBSS STAs - trying to scan for other IBSS networks with same SSID (merge)\n");
Johannes Berg46900292009-02-15 12:44:28 +01001306
Simon Wunderlich7ca15a02013-07-08 16:55:56 +02001307 scan_width = cfg80211_chandef_to_scan_width(&ifibss->chandef);
Stanislaw Gruszka34bcf712012-12-11 10:48:23 +01001308 ieee80211_request_ibss_scan(sdata, ifibss->ssid, ifibss->ssid_len,
Janusz.Dziedzic@tieto.com76bed0f2015-03-20 06:37:00 +01001309 NULL, 0, scan_width);
Johannes Berg46900292009-02-15 12:44:28 +01001310}
1311
Johannes Bergaf8cdcd2009-04-19 21:25:43 +02001312static void ieee80211_sta_create_ibss(struct ieee80211_sub_if_data *sdata)
Johannes Berg46900292009-02-15 12:44:28 +01001313{
1314 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
Johannes Berg46900292009-02-15 12:44:28 +01001315 u8 bssid[ETH_ALEN];
Johannes Berg46900292009-02-15 12:44:28 +01001316 u16 capability;
1317 int i;
1318
Johannes Berg8d61ffa2013-05-10 12:32:47 +02001319 sdata_assert_lock(sdata);
Johannes Berg7a17a332010-07-21 11:30:27 +02001320
Johannes Bergaf8cdcd2009-04-19 21:25:43 +02001321 if (ifibss->fixed_bssid) {
Johannes Berg46900292009-02-15 12:44:28 +01001322 memcpy(bssid, ifibss->bssid, ETH_ALEN);
1323 } else {
1324 /* Generate random, not broadcast, locally administered BSSID. Mix in
1325 * own MAC address to make sure that devices that do not have proper
1326 * random number generator get different BSSID. */
1327 get_random_bytes(bssid, ETH_ALEN);
1328 for (i = 0; i < ETH_ALEN; i++)
Johannes Berg47846c92009-11-25 17:46:19 +01001329 bssid[i] ^= sdata->vif.addr[i];
Johannes Berg46900292009-02-15 12:44:28 +01001330 bssid[0] &= ~0x01;
1331 bssid[0] |= 0x02;
1332 }
1333
Johannes Bergbdcbd8e2012-06-22 11:29:50 +02001334 sdata_info(sdata, "Creating new IBSS network, BSSID %pM\n", bssid);
Johannes Berg46900292009-02-15 12:44:28 +01001335
Johannes Berg46900292009-02-15 12:44:28 +01001336 capability = WLAN_CAPABILITY_IBSS;
1337
Johannes Bergfffd0932009-07-08 14:22:54 +02001338 if (ifibss->privacy)
Johannes Berg46900292009-02-15 12:44:28 +01001339 capability |= WLAN_CAPABILITY_PRIVACY;
Johannes Berg46900292009-02-15 12:44:28 +01001340
Johannes Berg57c4d7b2009-04-23 16:10:04 +02001341 __ieee80211_sta_join_ibss(sdata, bssid, sdata->vif.bss_conf.beacon_int,
Simon Wunderlich75a423f2013-08-21 15:30:25 +02001342 &ifibss->chandef, ifibss->basic_rates,
Sujith Manoharanc13a7652012-10-12 17:35:45 +05301343 capability, 0, true);
Johannes Berg46900292009-02-15 12:44:28 +01001344}
1345
Janusz.Dziedzic@tieto.com76bed0f2015-03-20 06:37:00 +01001346static unsigned ibss_setup_channels(struct wiphy *wiphy,
1347 struct ieee80211_channel **channels,
1348 unsigned int channels_max,
1349 u32 center_freq, u32 width)
1350{
1351 struct ieee80211_channel *chan = NULL;
1352 unsigned int n_chan = 0;
1353 u32 start_freq, end_freq, freq;
1354
1355 if (width <= 20) {
1356 start_freq = center_freq;
1357 end_freq = center_freq;
1358 } else {
1359 start_freq = center_freq - width / 2 + 10;
1360 end_freq = center_freq + width / 2 - 10;
1361 }
1362
1363 for (freq = start_freq; freq <= end_freq; freq += 20) {
1364 chan = ieee80211_get_channel(wiphy, freq);
1365 if (!chan)
1366 continue;
1367 if (n_chan >= channels_max)
1368 return n_chan;
1369
1370 channels[n_chan] = chan;
1371 n_chan++;
1372 }
1373
1374 return n_chan;
1375}
1376
1377static unsigned int
1378ieee80211_ibss_setup_scan_channels(struct wiphy *wiphy,
1379 const struct cfg80211_chan_def *chandef,
1380 struct ieee80211_channel **channels,
1381 unsigned int channels_max)
1382{
1383 unsigned int n_chan = 0;
1384 u32 width, cf1, cf2 = 0;
1385
1386 switch (chandef->width) {
1387 case NL80211_CHAN_WIDTH_40:
1388 width = 40;
1389 break;
1390 case NL80211_CHAN_WIDTH_80P80:
1391 cf2 = chandef->center_freq2;
1392 /* fall through */
1393 case NL80211_CHAN_WIDTH_80:
1394 width = 80;
1395 break;
1396 case NL80211_CHAN_WIDTH_160:
1397 width = 160;
1398 break;
1399 default:
1400 width = 20;
1401 break;
1402 }
1403
1404 cf1 = chandef->center_freq1;
1405
1406 n_chan = ibss_setup_channels(wiphy, channels, channels_max, cf1, width);
1407
1408 if (cf2)
1409 n_chan += ibss_setup_channels(wiphy, &channels[n_chan],
1410 channels_max - n_chan, cf2,
1411 width);
1412
1413 return n_chan;
1414}
1415
Benoit Papillaultce9058a2010-01-17 22:45:23 +01001416/*
1417 * This function is called with state == IEEE80211_IBSS_MLME_SEARCH
1418 */
1419
Johannes Bergaf8cdcd2009-04-19 21:25:43 +02001420static void ieee80211_sta_find_ibss(struct ieee80211_sub_if_data *sdata)
Johannes Berg46900292009-02-15 12:44:28 +01001421{
1422 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1423 struct ieee80211_local *local = sdata->local;
Johannes Berg0c1ad2c2009-12-23 13:15:39 +01001424 struct cfg80211_bss *cbss;
Johannes Bergaf8cdcd2009-04-19 21:25:43 +02001425 struct ieee80211_channel *chan = NULL;
Johannes Berg46900292009-02-15 12:44:28 +01001426 const u8 *bssid = NULL;
Simon Wunderlich7ca15a02013-07-08 16:55:56 +02001427 enum nl80211_bss_scan_width scan_width;
Johannes Berg46900292009-02-15 12:44:28 +01001428 int active_ibss;
1429
Johannes Berg8d61ffa2013-05-10 12:32:47 +02001430 sdata_assert_lock(sdata);
Johannes Berg7a17a332010-07-21 11:30:27 +02001431
Johannes Berg46900292009-02-15 12:44:28 +01001432 active_ibss = ieee80211_sta_active_ibss(sdata);
Johannes Bergbdcbd8e2012-06-22 11:29:50 +02001433 ibss_dbg(sdata, "sta_find_ibss (active_ibss=%d)\n", active_ibss);
Johannes Berg46900292009-02-15 12:44:28 +01001434
1435 if (active_ibss)
Johannes Bergaf8cdcd2009-04-19 21:25:43 +02001436 return;
Johannes Berg46900292009-02-15 12:44:28 +01001437
Johannes Bergaf8cdcd2009-04-19 21:25:43 +02001438 if (ifibss->fixed_bssid)
Johannes Berg46900292009-02-15 12:44:28 +01001439 bssid = ifibss->bssid;
Johannes Bergaf8cdcd2009-04-19 21:25:43 +02001440 if (ifibss->fixed_channel)
Simon Wunderlich3aede782013-05-16 13:00:36 +02001441 chan = ifibss->chandef.chan;
Johannes Bergaf8cdcd2009-04-19 21:25:43 +02001442 if (!is_zero_ether_addr(ifibss->bssid))
1443 bssid = ifibss->bssid;
Johannes Berg0c1ad2c2009-12-23 13:15:39 +01001444 cbss = cfg80211_get_bss(local->hw.wiphy, chan, bssid,
1445 ifibss->ssid, ifibss->ssid_len,
Dedy Lansky6eb18132015-02-08 15:52:03 +02001446 IEEE80211_BSS_TYPE_IBSS,
1447 IEEE80211_PRIVACY(ifibss->privacy));
Johannes Berg46900292009-02-15 12:44:28 +01001448
Johannes Berg0c1ad2c2009-12-23 13:15:39 +01001449 if (cbss) {
1450 struct ieee80211_bss *bss;
1451
1452 bss = (void *)cbss->priv;
Johannes Bergbdcbd8e2012-06-22 11:29:50 +02001453 ibss_dbg(sdata,
1454 "sta_find_ibss: selected %pM current %pM\n",
1455 cbss->bssid, ifibss->bssid);
1456 sdata_info(sdata,
1457 "Selected IBSS BSSID %pM based on configured SSID\n",
1458 cbss->bssid);
Johannes Berg46900292009-02-15 12:44:28 +01001459
Johannes Bergaf8cdcd2009-04-19 21:25:43 +02001460 ieee80211_sta_join_ibss(sdata, bss);
Johannes Berg46900292009-02-15 12:44:28 +01001461 ieee80211_rx_bss_put(local, bss);
Johannes Bergaf8cdcd2009-04-19 21:25:43 +02001462 return;
Reinette Chatred419b9f2009-10-19 14:55:37 -07001463 }
Johannes Berg46900292009-02-15 12:44:28 +01001464
Antonio Quartullid8eb7412013-08-09 18:58:32 +02001465 /* if a fixed bssid and a fixed freq have been provided create the IBSS
1466 * directly and do not waste time scanning
1467 */
1468 if (ifibss->fixed_bssid && ifibss->fixed_channel) {
1469 sdata_info(sdata, "Created IBSS using preconfigured BSSID %pM\n",
1470 bssid);
1471 ieee80211_sta_create_ibss(sdata);
1472 return;
1473 }
1474
1475
Johannes Bergbdcbd8e2012-06-22 11:29:50 +02001476 ibss_dbg(sdata, "sta_find_ibss: did not try to join ibss\n");
Johannes Berg46900292009-02-15 12:44:28 +01001477
1478 /* Selected IBSS not found in current scan results - try to scan */
Benoit Papillaultce9058a2010-01-17 22:45:23 +01001479 if (time_after(jiffies, ifibss->last_scan_completed +
Johannes Berg46900292009-02-15 12:44:28 +01001480 IEEE80211_SCAN_INTERVAL)) {
Janusz.Dziedzic@tieto.com76bed0f2015-03-20 06:37:00 +01001481 struct ieee80211_channel *channels[8];
1482 unsigned int num;
1483
Johannes Bergbdcbd8e2012-06-22 11:29:50 +02001484 sdata_info(sdata, "Trigger new scan to find an IBSS to join\n");
Johannes Berg46900292009-02-15 12:44:28 +01001485
Simon Wunderlich7ca15a02013-07-08 16:55:56 +02001486 scan_width = cfg80211_chandef_to_scan_width(&ifibss->chandef);
Sara Sharond321cd02016-01-25 15:46:35 +02001487
1488 if (ifibss->fixed_channel) {
1489 num = ieee80211_ibss_setup_scan_channels(local->hw.wiphy,
1490 &ifibss->chandef,
1491 channels,
1492 ARRAY_SIZE(channels));
1493 ieee80211_request_ibss_scan(sdata, ifibss->ssid,
1494 ifibss->ssid_len, channels,
1495 num, scan_width);
1496 } else {
1497 ieee80211_request_ibss_scan(sdata, ifibss->ssid,
1498 ifibss->ssid_len, NULL,
1499 0, scan_width);
1500 }
Benoit Papillaultce9058a2010-01-17 22:45:23 +01001501 } else {
Johannes Berg46900292009-02-15 12:44:28 +01001502 int interval = IEEE80211_SCAN_INTERVAL;
1503
1504 if (time_after(jiffies, ifibss->ibss_join_req +
Johannes Berg55de9082012-07-26 17:24:39 +02001505 IEEE80211_IBSS_JOIN_TIMEOUT))
1506 ieee80211_sta_create_ibss(sdata);
Johannes Berg46900292009-02-15 12:44:28 +01001507
Johannes Bergaf8cdcd2009-04-19 21:25:43 +02001508 mod_timer(&ifibss->timer,
1509 round_jiffies(jiffies + interval));
Johannes Berg46900292009-02-15 12:44:28 +01001510 }
Johannes Berg46900292009-02-15 12:44:28 +01001511}
1512
1513static void ieee80211_rx_mgmt_probe_req(struct ieee80211_sub_if_data *sdata,
Johannes Bergc269a202011-02-14 12:20:22 +01001514 struct sk_buff *req)
Johannes Berg46900292009-02-15 12:44:28 +01001515{
Johannes Bergc269a202011-02-14 12:20:22 +01001516 struct ieee80211_mgmt *mgmt = (void *)req->data;
Johannes Berg46900292009-02-15 12:44:28 +01001517 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1518 struct ieee80211_local *local = sdata->local;
Johannes Bergc269a202011-02-14 12:20:22 +01001519 int tx_last_beacon, len = req->len;
Johannes Berg46900292009-02-15 12:44:28 +01001520 struct sk_buff *skb;
Johannes Bergc3ffeab2013-03-07 20:54:29 +01001521 struct beacon_data *presp;
Johannes Berg46900292009-02-15 12:44:28 +01001522 u8 *pos, *end;
1523
Johannes Berg8d61ffa2013-05-10 12:32:47 +02001524 sdata_assert_lock(sdata);
Johannes Berg7a17a332010-07-21 11:30:27 +02001525
Johannes Berg40b275b2011-05-13 14:15:49 +02001526 presp = rcu_dereference_protected(ifibss->presp,
Johannes Berg8d61ffa2013-05-10 12:32:47 +02001527 lockdep_is_held(&sdata->wdev.mtx));
Johannes Berg40b275b2011-05-13 14:15:49 +02001528
Johannes Berg46900292009-02-15 12:44:28 +01001529 if (ifibss->state != IEEE80211_IBSS_MLME_JOINED ||
Johannes Berg40b275b2011-05-13 14:15:49 +02001530 len < 24 + 2 || !presp)
Johannes Berg46900292009-02-15 12:44:28 +01001531 return;
1532
Johannes Berg24487982009-04-23 18:52:52 +02001533 tx_last_beacon = drv_tx_last_beacon(local);
Johannes Berg46900292009-02-15 12:44:28 +01001534
Johannes Bergbdcbd8e2012-06-22 11:29:50 +02001535 ibss_dbg(sdata,
1536 "RX ProbeReq SA=%pM DA=%pM BSSID=%pM (tx_last_beacon=%d)\n",
1537 mgmt->sa, mgmt->da, mgmt->bssid, tx_last_beacon);
Johannes Berg46900292009-02-15 12:44:28 +01001538
Felix Fietkau1ed76482011-03-24 19:46:18 +01001539 if (!tx_last_beacon && is_multicast_ether_addr(mgmt->da))
Johannes Berg46900292009-02-15 12:44:28 +01001540 return;
1541
Joe Perchesb203ca32012-05-08 18:56:52 +00001542 if (!ether_addr_equal(mgmt->bssid, ifibss->bssid) &&
Felix Fietkau888d04d2012-03-01 15:22:09 +01001543 !is_broadcast_ether_addr(mgmt->bssid))
Johannes Berg46900292009-02-15 12:44:28 +01001544 return;
1545
1546 end = ((u8 *) mgmt) + len;
1547 pos = mgmt->u.probe_req.variable;
1548 if (pos[0] != WLAN_EID_SSID ||
1549 pos + 2 + pos[1] > end) {
Johannes Bergbdcbd8e2012-06-22 11:29:50 +02001550 ibss_dbg(sdata, "Invalid SSID IE in ProbeReq from %pM\n",
1551 mgmt->sa);
Johannes Berg46900292009-02-15 12:44:28 +01001552 return;
1553 }
1554 if (pos[1] != 0 &&
1555 (pos[1] != ifibss->ssid_len ||
Benoit Papillault0da780c2010-02-05 01:21:03 +01001556 memcmp(pos + 2, ifibss->ssid, ifibss->ssid_len))) {
Johannes Berg46900292009-02-15 12:44:28 +01001557 /* Ignore ProbeReq for foreign SSID */
1558 return;
1559 }
1560
1561 /* Reply with ProbeResp */
Johannes Bergc3ffeab2013-03-07 20:54:29 +01001562 skb = dev_alloc_skb(local->tx_headroom + presp->head_len);
Johannes Berg46900292009-02-15 12:44:28 +01001563 if (!skb)
1564 return;
1565
Johannes Bergc3ffeab2013-03-07 20:54:29 +01001566 skb_reserve(skb, local->tx_headroom);
1567 memcpy(skb_put(skb, presp->head_len), presp->head, presp->head_len);
1568
1569 memcpy(((struct ieee80211_mgmt *) skb->data)->da, mgmt->sa, ETH_ALEN);
1570 ibss_dbg(sdata, "Sending ProbeResp to %pM\n", mgmt->sa);
Johannes Berg62ae67b2009-11-18 18:42:05 +01001571 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
Simon Wunderlich691eb612014-01-24 23:48:29 +01001572
1573 /* avoid excessive retries for probe request to wildcard SSIDs */
1574 if (pos[1] == 0)
1575 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_CTL_NO_ACK;
1576
Johannes Berg62ae67b2009-11-18 18:42:05 +01001577 ieee80211_tx_skb(sdata, skb);
Johannes Berg46900292009-02-15 12:44:28 +01001578}
1579
Emmanuel Grumbachd45c4172012-12-10 16:19:13 +02001580static
1581void ieee80211_rx_mgmt_probe_beacon(struct ieee80211_sub_if_data *sdata,
1582 struct ieee80211_mgmt *mgmt, size_t len,
1583 struct ieee80211_rx_status *rx_status)
Johannes Berg46900292009-02-15 12:44:28 +01001584{
1585 size_t baselen;
1586 struct ieee802_11_elems elems;
1587
Emmanuel Grumbachd45c4172012-12-10 16:19:13 +02001588 BUILD_BUG_ON(offsetof(typeof(mgmt->u.probe_resp), variable) !=
1589 offsetof(typeof(mgmt->u.beacon), variable));
1590
1591 /*
1592 * either beacon or probe_resp but the variable field is at the
1593 * same offset
1594 */
Johannes Berg46900292009-02-15 12:44:28 +01001595 baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt;
1596 if (baselen > len)
1597 return;
1598
1599 ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen,
Johannes Bergb2e506b2013-03-26 14:54:16 +01001600 false, &elems);
Johannes Berg46900292009-02-15 12:44:28 +01001601
Emmanuel Grumbachd45c4172012-12-10 16:19:13 +02001602 ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems);
Johannes Berg46900292009-02-15 12:44:28 +01001603}
1604
Johannes Berg1fa57d02010-06-10 10:21:32 +02001605void ieee80211_ibss_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata,
1606 struct sk_buff *skb)
Johannes Berg46900292009-02-15 12:44:28 +01001607{
1608 struct ieee80211_rx_status *rx_status;
1609 struct ieee80211_mgmt *mgmt;
1610 u16 fc;
Simon Wunderlichcd7760e2013-08-28 13:41:31 +02001611 struct ieee802_11_elems elems;
1612 int ies_len;
Johannes Berg46900292009-02-15 12:44:28 +01001613
Johannes Bergf1d58c22009-06-17 13:13:00 +02001614 rx_status = IEEE80211_SKB_RXCB(skb);
Johannes Berg46900292009-02-15 12:44:28 +01001615 mgmt = (struct ieee80211_mgmt *) skb->data;
1616 fc = le16_to_cpu(mgmt->frame_control);
1617
Johannes Berg8d61ffa2013-05-10 12:32:47 +02001618 sdata_lock(sdata);
Johannes Berg7a17a332010-07-21 11:30:27 +02001619
Tim Harveyc926d002010-12-09 10:43:13 -08001620 if (!sdata->u.ibss.ssid_len)
1621 goto mgmt_out; /* not ready to merge yet */
1622
Johannes Berg46900292009-02-15 12:44:28 +01001623 switch (fc & IEEE80211_FCTL_STYPE) {
1624 case IEEE80211_STYPE_PROBE_REQ:
Johannes Bergc269a202011-02-14 12:20:22 +01001625 ieee80211_rx_mgmt_probe_req(sdata, skb);
Johannes Berg46900292009-02-15 12:44:28 +01001626 break;
1627 case IEEE80211_STYPE_PROBE_RESP:
Johannes Berg46900292009-02-15 12:44:28 +01001628 case IEEE80211_STYPE_BEACON:
Emmanuel Grumbachd45c4172012-12-10 16:19:13 +02001629 ieee80211_rx_mgmt_probe_beacon(sdata, mgmt, skb->len,
1630 rx_status);
Johannes Berg46900292009-02-15 12:44:28 +01001631 break;
1632 case IEEE80211_STYPE_AUTH:
1633 ieee80211_rx_mgmt_auth_ibss(sdata, mgmt, skb->len);
1634 break;
Antonio Quartulli2cc59e72012-09-07 13:28:53 +02001635 case IEEE80211_STYPE_DEAUTH:
1636 ieee80211_rx_mgmt_deauth_ibss(sdata, mgmt, skb->len);
1637 break;
Simon Wunderlichcd7760e2013-08-28 13:41:31 +02001638 case IEEE80211_STYPE_ACTION:
1639 switch (mgmt->u.action.category) {
1640 case WLAN_CATEGORY_SPECTRUM_MGMT:
1641 ies_len = skb->len -
1642 offsetof(struct ieee80211_mgmt,
1643 u.action.u.chan_switch.variable);
1644
1645 if (ies_len < 0)
1646 break;
1647
1648 ieee802_11_parse_elems(
1649 mgmt->u.action.u.chan_switch.variable,
1650 ies_len, true, &elems);
1651
1652 if (elems.parse_error)
1653 break;
1654
1655 ieee80211_rx_mgmt_spectrum_mgmt(sdata, mgmt, skb->len,
1656 rx_status, &elems);
1657 break;
1658 }
Johannes Berg46900292009-02-15 12:44:28 +01001659 }
Johannes Berg7a17a332010-07-21 11:30:27 +02001660
Tim Harveyc926d002010-12-09 10:43:13 -08001661 mgmt_out:
Johannes Berg8d61ffa2013-05-10 12:32:47 +02001662 sdata_unlock(sdata);
Johannes Berg46900292009-02-15 12:44:28 +01001663}
1664
Johannes Berg1fa57d02010-06-10 10:21:32 +02001665void ieee80211_ibss_work(struct ieee80211_sub_if_data *sdata)
Johannes Berg46900292009-02-15 12:44:28 +01001666{
Johannes Berg1fa57d02010-06-10 10:21:32 +02001667 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
Johannes Berg8bf11d82011-12-15 11:17:37 +01001668 struct sta_info *sta;
Johannes Berg46900292009-02-15 12:44:28 +01001669
Johannes Berg8d61ffa2013-05-10 12:32:47 +02001670 sdata_lock(sdata);
Johannes Berg7a17a332010-07-21 11:30:27 +02001671
1672 /*
1673 * Work could be scheduled after scan or similar
1674 * when we aren't even joined (or trying) with a
1675 * network.
1676 */
1677 if (!ifibss->ssid_len)
1678 goto out;
Johannes Berg46900292009-02-15 12:44:28 +01001679
Johannes Berg8bf11d82011-12-15 11:17:37 +01001680 spin_lock_bh(&ifibss->incomplete_lock);
1681 while (!list_empty(&ifibss->incomplete_stations)) {
1682 sta = list_first_entry(&ifibss->incomplete_stations,
1683 struct sta_info, list);
1684 list_del(&sta->list);
1685 spin_unlock_bh(&ifibss->incomplete_lock);
1686
Antonio Quartulli52874a52013-06-18 14:20:40 +02001687 ieee80211_ibss_finish_sta(sta);
Johannes Berg8bf11d82011-12-15 11:17:37 +01001688 rcu_read_unlock();
1689 spin_lock_bh(&ifibss->incomplete_lock);
1690 }
1691 spin_unlock_bh(&ifibss->incomplete_lock);
1692
Johannes Berg46900292009-02-15 12:44:28 +01001693 switch (ifibss->state) {
1694 case IEEE80211_IBSS_MLME_SEARCH:
1695 ieee80211_sta_find_ibss(sdata);
1696 break;
1697 case IEEE80211_IBSS_MLME_JOINED:
1698 ieee80211_sta_merge_ibss(sdata);
1699 break;
1700 default:
1701 WARN_ON(1);
1702 break;
1703 }
Johannes Berg46900292009-02-15 12:44:28 +01001704
Johannes Berg7a17a332010-07-21 11:30:27 +02001705 out:
Johannes Berg8d61ffa2013-05-10 12:32:47 +02001706 sdata_unlock(sdata);
Johannes Berg3a4d4aa2010-05-26 16:41:40 +02001707}
1708
Johannes Berg46900292009-02-15 12:44:28 +01001709static void ieee80211_ibss_timer(unsigned long data)
1710{
1711 struct ieee80211_sub_if_data *sdata =
1712 (struct ieee80211_sub_if_data *) data;
Johannes Berg46900292009-02-15 12:44:28 +01001713
Stanislaw Gruszkaa6182942013-02-28 10:55:28 +01001714 ieee80211_queue_work(&sdata->local->hw, &sdata->work);
Johannes Berg46900292009-02-15 12:44:28 +01001715}
1716
1717void ieee80211_ibss_setup_sdata(struct ieee80211_sub_if_data *sdata)
1718{
1719 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1720
Johannes Berg46900292009-02-15 12:44:28 +01001721 setup_timer(&ifibss->timer, ieee80211_ibss_timer,
1722 (unsigned long) sdata);
Johannes Berg8bf11d82011-12-15 11:17:37 +01001723 INIT_LIST_HEAD(&ifibss->incomplete_stations);
1724 spin_lock_init(&ifibss->incomplete_lock);
Simon Wunderlichcd7760e2013-08-28 13:41:31 +02001725 INIT_WORK(&ifibss->csa_connection_drop_work,
1726 ieee80211_csa_connection_drop_work);
Johannes Berg46900292009-02-15 12:44:28 +01001727}
1728
1729/* scan finished notification */
1730void ieee80211_ibss_notify_scan_completed(struct ieee80211_local *local)
1731{
Johannes Bergaf8cdcd2009-04-19 21:25:43 +02001732 struct ieee80211_sub_if_data *sdata;
Johannes Berg46900292009-02-15 12:44:28 +01001733
Johannes Berg29b4a4f2009-04-21 00:30:49 +02001734 mutex_lock(&local->iflist_mtx);
1735 list_for_each_entry(sdata, &local->interfaces, list) {
Johannes Berg9607e6b2009-12-23 13:15:31 +01001736 if (!ieee80211_sdata_running(sdata))
Johannes Berg0e41f712009-04-23 11:48:56 +02001737 continue;
Johannes Bergaf8cdcd2009-04-19 21:25:43 +02001738 if (sdata->vif.type != NL80211_IFTYPE_ADHOC)
1739 continue;
1740 sdata->u.ibss.last_scan_completed = jiffies;
Johannes Berg46900292009-02-15 12:44:28 +01001741 }
Johannes Berg29b4a4f2009-04-21 00:30:49 +02001742 mutex_unlock(&local->iflist_mtx);
Johannes Berg46900292009-02-15 12:44:28 +01001743}
1744
Johannes Bergaf8cdcd2009-04-19 21:25:43 +02001745int ieee80211_ibss_join(struct ieee80211_sub_if_data *sdata,
1746 struct cfg80211_ibss_params *params)
1747{
Simon Wunderlichff3cc5f2011-11-30 16:56:33 +01001748 u32 changed = 0;
Simon Wunderlich2103dec2013-07-08 16:55:53 +02001749 u32 rate_flags;
1750 struct ieee80211_supported_band *sband;
Luciano Coelho71965c12014-02-18 17:07:53 +02001751 enum ieee80211_chanctx_mode chanmode;
1752 struct ieee80211_local *local = sdata->local;
1753 int radar_detect_width = 0;
Simon Wunderlich2103dec2013-07-08 16:55:53 +02001754 int i;
Luciano Coelho71965c12014-02-18 17:07:53 +02001755 int ret;
1756
1757 ret = cfg80211_chandef_dfs_required(local->hw.wiphy,
1758 &params->chandef,
1759 sdata->wdev.iftype);
1760 if (ret < 0)
1761 return ret;
1762
1763 if (ret > 0) {
1764 if (!params->userspace_handles_dfs)
1765 return -EINVAL;
1766 radar_detect_width = BIT(params->chandef.width);
1767 }
1768
1769 chanmode = (params->channel_fixed && !ret) ?
1770 IEEE80211_CHANCTX_SHARED : IEEE80211_CHANCTX_EXCLUSIVE;
1771
1772 mutex_lock(&local->chanctx_mtx);
1773 ret = ieee80211_check_combinations(sdata, &params->chandef, chanmode,
1774 radar_detect_width);
1775 mutex_unlock(&local->chanctx_mtx);
1776 if (ret < 0)
1777 return ret;
Johannes Bergaf8cdcd2009-04-19 21:25:43 +02001778
Johannes Bergaf8cdcd2009-04-19 21:25:43 +02001779 if (params->bssid) {
1780 memcpy(sdata->u.ibss.bssid, params->bssid, ETH_ALEN);
1781 sdata->u.ibss.fixed_bssid = true;
1782 } else
1783 sdata->u.ibss.fixed_bssid = false;
1784
Johannes Bergfffd0932009-07-08 14:22:54 +02001785 sdata->u.ibss.privacy = params->privacy;
Antonio Quartulli267335d2012-01-31 20:25:47 +01001786 sdata->u.ibss.control_port = params->control_port;
Simon Wunderlich8e8d3472013-10-07 18:41:06 +02001787 sdata->u.ibss.userspace_handles_dfs = params->userspace_handles_dfs;
Teemu Paasikivifbd2c8d2010-06-14 12:55:31 +03001788 sdata->u.ibss.basic_rates = params->basic_rates;
Krzysztof HaƂasac7d37a62014-05-26 14:14:46 +02001789 sdata->u.ibss.last_scan_completed = jiffies;
Simon Wunderlich2103dec2013-07-08 16:55:53 +02001790
1791 /* fix basic_rates if channel does not support these rates */
1792 rate_flags = ieee80211_chandef_rate_flags(&params->chandef);
Luciano Coelho71965c12014-02-18 17:07:53 +02001793 sband = local->hw.wiphy->bands[params->chandef.chan->band];
Simon Wunderlich2103dec2013-07-08 16:55:53 +02001794 for (i = 0; i < sband->n_bitrates; i++) {
1795 if ((rate_flags & sband->bitrates[i].flags) != rate_flags)
1796 sdata->u.ibss.basic_rates &= ~BIT(i);
1797 }
Felix Fietkaudd5b4cc2010-11-22 20:58:24 +01001798 memcpy(sdata->vif.bss_conf.mcast_rate, params->mcast_rate,
1799 sizeof(params->mcast_rate));
Johannes Bergfffd0932009-07-08 14:22:54 +02001800
Johannes Berg57c4d7b2009-04-23 16:10:04 +02001801 sdata->vif.bss_conf.beacon_int = params->beacon_interval;
1802
Simon Wunderlich3aede782013-05-16 13:00:36 +02001803 sdata->u.ibss.chandef = params->chandef;
Johannes Bergaf8cdcd2009-04-19 21:25:43 +02001804 sdata->u.ibss.fixed_channel = params->channel_fixed;
1805
1806 if (params->ie) {
1807 sdata->u.ibss.ie = kmemdup(params->ie, params->ie_len,
1808 GFP_KERNEL);
1809 if (sdata->u.ibss.ie)
1810 sdata->u.ibss.ie_len = params->ie_len;
1811 }
1812
Johannes Bergaf8cdcd2009-04-19 21:25:43 +02001813 sdata->u.ibss.state = IEEE80211_IBSS_MLME_SEARCH;
1814 sdata->u.ibss.ibss_join_req = jiffies;
1815
Antonio Quartullibadecb02012-10-26 18:54:25 +02001816 memcpy(sdata->u.ibss.ssid, params->ssid, params->ssid_len);
Johannes Berg0e41f712009-04-23 11:48:56 +02001817 sdata->u.ibss.ssid_len = params->ssid_len;
1818
Simon Wunderlich822854b2013-06-28 10:39:59 +02001819 memcpy(&sdata->u.ibss.ht_capa, &params->ht_capa,
1820 sizeof(sdata->u.ibss.ht_capa));
1821 memcpy(&sdata->u.ibss.ht_capa_mask, &params->ht_capa_mask,
1822 sizeof(sdata->u.ibss.ht_capa_mask));
1823
Simon Wunderlichff3cc5f2011-11-30 16:56:33 +01001824 /*
1825 * 802.11n-2009 9.13.3.1: In an IBSS, the HT Protection field is
1826 * reserved, but an HT STA shall protect HT transmissions as though
1827 * the HT Protection field were set to non-HT mixed mode.
1828 *
1829 * In an IBSS, the RIFS Mode field of the HT Operation element is
1830 * also reserved, but an HT STA shall operate as though this field
1831 * were set to 1.
1832 */
1833
1834 sdata->vif.bss_conf.ht_operation_mode |=
1835 IEEE80211_HT_OP_MODE_PROTECTION_NONHT_MIXED
1836 | IEEE80211_HT_PARAM_RIFS_MODE;
1837
1838 changed |= BSS_CHANGED_HT;
1839 ieee80211_bss_info_change_notify(sdata, changed);
1840
Johannes Berg04ecd252012-09-11 14:34:12 +02001841 sdata->smps_mode = IEEE80211_SMPS_OFF;
Luciano Coelho71965c12014-02-18 17:07:53 +02001842 sdata->needed_rx_chains = local->rx_chains;
Johannes Berg04ecd252012-09-11 14:34:12 +02001843
Luciano Coelho71965c12014-02-18 17:07:53 +02001844 ieee80211_queue_work(&local->hw, &sdata->work);
Johannes Bergaf8cdcd2009-04-19 21:25:43 +02001845
1846 return 0;
1847}
1848
1849int ieee80211_ibss_leave(struct ieee80211_sub_if_data *sdata)
1850{
Teemu Paasikivi5ea096c2010-06-14 12:55:33 +03001851 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
Johannes Berg7a17a332010-07-21 11:30:27 +02001852
Simon Wunderlich871a4182013-08-28 13:41:30 +02001853 ieee80211_ibss_disconnect(sdata);
Simon Wunderlichb78a4932012-11-13 18:43:03 +01001854 ifibss->ssid_len = 0;
Joe Perchesc84a67a2015-03-02 19:54:57 -08001855 eth_zero_addr(ifibss->bssid);
Johannes Bergaf8cdcd2009-04-19 21:25:43 +02001856
1857 /* remove beacon */
1858 kfree(sdata->u.ibss.ie);
Simon Wunderlich822854b2013-06-28 10:39:59 +02001859
1860 /* on the next join, re-program HT parameters */
1861 memset(&ifibss->ht_capa, 0, sizeof(ifibss->ht_capa));
1862 memset(&ifibss->ht_capa_mask, 0, sizeof(ifibss->ht_capa_mask));
1863
Johannes Bergaf8cdcd2009-04-19 21:25:43 +02001864 synchronize_rcu();
Johannes Bergaf8cdcd2009-04-19 21:25:43 +02001865
Johannes Berg35f20c12010-06-10 10:21:30 +02001866 skb_queue_purge(&sdata->skb_queue);
Johannes Berg5cff20e2009-04-29 12:26:17 +02001867
Johannes Bergbc05d192010-07-21 10:52:40 +02001868 del_timer_sync(&sdata->u.ibss.timer);
Johannes Berg7a17a332010-07-21 11:30:27 +02001869
Johannes Bergaf8cdcd2009-04-19 21:25:43 +02001870 return 0;
1871}