blob: 0416c4d222929bacd0d30740c31d76afc0b29904 [file] [log] [blame]
Thomas Gleixnerd2912cb2019-06-04 10:11:33 +02001// SPDX-License-Identifier: GPL-2.0-only
Johannes Berg46900292009-02-15 12:44:28 +01002/*
3 * IBSS mode implementation
4 * Copyright 2003-2008, Jouni Malinen <j@w1.fi>
5 * Copyright 2004, Instant802 Networks, Inc.
6 * Copyright 2005, Devicescape Software, Inc.
7 * Copyright 2006-2007 Jiri Benc <jbenc@suse.cz>
8 * Copyright 2007, Michael Wu <flamingice@sourmilk.net>
9 * Copyright 2009, Johannes Berg <johannes@sipsolutions.net>
Johannes Bergd98ad832014-09-03 15:24:57 +030010 * Copyright 2013-2014 Intel Mobile Communications GmbH
Sara Sharond321cd02016-01-25 15:46:35 +020011 * Copyright(c) 2016 Intel Deutschland GmbH
Johannes Berg5d248282021-09-20 15:40:10 +020012 * Copyright(c) 2018-2021 Intel Corporation
Johannes Berg46900292009-02-15 12:44:28 +010013 */
14
15#include <linux/delay.h>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090016#include <linux/slab.h>
Johannes Berg46900292009-02-15 12:44:28 +010017#include <linux/if_ether.h>
18#include <linux/skbuff.h>
19#include <linux/if_arp.h>
20#include <linux/etherdevice.h>
21#include <linux/rtnetlink.h>
22#include <net/mac80211.h>
Johannes Berg46900292009-02-15 12:44:28 +010023
24#include "ieee80211_i.h"
Johannes Berg24487982009-04-23 18:52:52 +020025#include "driver-ops.h"
Johannes Berg46900292009-02-15 12:44:28 +010026#include "rate.h"
27
28#define IEEE80211_SCAN_INTERVAL (2 * HZ)
Johannes Berg46900292009-02-15 12:44:28 +010029#define IEEE80211_IBSS_JOIN_TIMEOUT (7 * HZ)
30
31#define IEEE80211_IBSS_MERGE_INTERVAL (30 * HZ)
32#define IEEE80211_IBSS_INACTIVITY_LIMIT (60 * HZ)
Antonio Quartullidad9def2013-07-26 21:15:02 +020033#define IEEE80211_IBSS_RSN_INACTIVITY_LIMIT (10 * HZ)
Johannes Berg46900292009-02-15 12:44:28 +010034
35#define IEEE80211_IBSS_MAX_STA_ENTRIES 128
36
Simon Wunderlichd51b70f2013-08-09 16:35:17 +020037static struct beacon_data *
38ieee80211_ibss_build_presp(struct ieee80211_sub_if_data *sdata,
39 const int beacon_int, const u32 basic_rates,
40 const u16 capability, u64 tsf,
41 struct cfg80211_chan_def *chandef,
Simon Wunderlichcd7760e2013-08-28 13:41:31 +020042 bool *have_higher_than_11mbit,
43 struct cfg80211_csa_settings *csa_settings)
Simon Wunderlichd51b70f2013-08-09 16:35:17 +020044{
45 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
46 struct ieee80211_local *local = sdata->local;
47 int rates_n = 0, i, ri;
48 struct ieee80211_mgmt *mgmt;
49 u8 *pos;
50 struct ieee80211_supported_band *sband;
51 u32 rate_flags, rates = 0, rates_added = 0;
52 struct beacon_data *presp;
53 int frame_len;
54 int shift;
55
56 /* Build IBSS probe response */
57 frame_len = sizeof(struct ieee80211_hdr_3addr) +
58 12 /* struct ieee80211_mgmt.u.beacon */ +
59 2 + IEEE80211_MAX_SSID_LEN /* max SSID */ +
60 2 + 8 /* max Supported Rates */ +
61 3 /* max DS params */ +
62 4 /* IBSS params */ +
Simon Wunderlichcd7760e2013-08-28 13:41:31 +020063 5 /* Channel Switch Announcement */ +
Simon Wunderlichd51b70f2013-08-09 16:35:17 +020064 2 + (IEEE80211_MAX_SUPP_RATES - 8) +
65 2 + sizeof(struct ieee80211_ht_cap) +
66 2 + sizeof(struct ieee80211_ht_operation) +
Johannes Bergf1f3e9e2017-04-27 13:19:04 +020067 2 + sizeof(struct ieee80211_vht_cap) +
68 2 + sizeof(struct ieee80211_vht_operation) +
Simon Wunderlichd51b70f2013-08-09 16:35:17 +020069 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);
John Crispin8552a432020-08-11 10:01:04 +0200148 presp->cntdwn_counter_offsets[0] = (pos - presp->head);
Simon Wunderlichcd7760e2013-08-28 13:41:31 +0200149 *pos++ = csa_settings->count;
John Crispin8552a432020-08-11 10:01:04 +0200150 presp->cntdwn_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 Wunderlich2f91a9672012-12-03 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 Wunderlich2f91a9672012-12-03 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,
Matthias Kaehlckea4ac6f22017-04-17 13:59:53 -0700428 NL80211_CHAN_NO_HT);
Simon Wunderlich75a423f2013-08-21 15:30:25 +0200429 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,
Matthias Kaehlckea4ac6f22017-04-17 13:59:53 -0700440 NL80211_CHAN_NO_HT);
Simon Wunderlich75a423f2013-08-21 15:30:25 +0200441 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;
Koen Vandeputtef181d6a2017-02-08 15:32:05 +0100490 u16 capability = WLAN_CAPABILITY_IBSS;
Simon Wunderlichcd7760e2013-08-28 13:41:31 +0200491 u64 tsf;
Simon Wunderlichcd7760e2013-08-28 13:41:31 +0200492
493 sdata_assert_lock(sdata);
494
Simon Wunderlichcd7760e2013-08-28 13:41:31 +0200495 if (ifibss->privacy)
Koen Vandeputtef181d6a2017-02-08 15:32:05 +0100496 capability |= WLAN_CAPABILITY_PRIVACY;
Simon Wunderlichcd7760e2013-08-28 13:41:31 +0200497
498 cbss = cfg80211_get_bss(sdata->local->hw.wiphy, ifibss->chandef.chan,
499 ifibss->bssid, ifibss->ssid,
Dedy Lansky6eb18132015-02-08 15:52:03 +0200500 ifibss->ssid_len, IEEE80211_BSS_TYPE_IBSS,
501 IEEE80211_PRIVACY(ifibss->privacy));
Simon Wunderlichcd7760e2013-08-28 13:41:31 +0200502
dingsenjie03236892021-08-05 14:43:49 +0800503 if (WARN_ON(!cbss))
504 return -EINVAL;
Simon Wunderlichcd7760e2013-08-28 13:41:31 +0200505
506 rcu_read_lock();
507 ies = rcu_dereference(cbss->ies);
508 tsf = ies->tsf;
509 rcu_read_unlock();
510 cfg80211_put_bss(sdata->local->hw.wiphy, cbss);
511
512 old_presp = rcu_dereference_protected(ifibss->presp,
513 lockdep_is_held(&sdata->wdev.mtx));
514
515 presp = ieee80211_ibss_build_presp(sdata,
516 sdata->vif.bss_conf.beacon_int,
517 sdata->vif.bss_conf.basic_rates,
518 capability, tsf, &ifibss->chandef,
519 NULL, csa_settings);
dingsenjie03236892021-08-05 14:43:49 +0800520 if (!presp)
521 return -ENOMEM;
Simon Wunderlichcd7760e2013-08-28 13:41:31 +0200522
523 rcu_assign_pointer(ifibss->presp, presp);
524 if (old_presp)
525 kfree_rcu(old_presp, rcu_head);
526
Luciano Coelhodddd5862013-12-13 21:13:51 +0200527 return BSS_CHANGED_BEACON;
Simon Wunderlichcd7760e2013-08-28 13:41:31 +0200528}
529
530int ieee80211_ibss_finish_csa(struct ieee80211_sub_if_data *sdata)
531{
532 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
533 struct cfg80211_bss *cbss;
Simon Wunderlichcd7760e2013-08-28 13:41:31 +0200534
Simon Wunderlichbafdc612013-12-05 19:54:43 +0100535 sdata_assert_lock(sdata);
536
Simon Wunderlichcd7760e2013-08-28 13:41:31 +0200537 /* update cfg80211 bss information with the new channel */
538 if (!is_zero_ether_addr(ifibss->bssid)) {
Simon Wunderlichcd7760e2013-08-28 13:41:31 +0200539 cbss = cfg80211_get_bss(sdata->local->hw.wiphy,
540 ifibss->chandef.chan,
541 ifibss->bssid, ifibss->ssid,
Dedy Lansky6eb18132015-02-08 15:52:03 +0200542 ifibss->ssid_len,
543 IEEE80211_BSS_TYPE_IBSS,
544 IEEE80211_PRIVACY(ifibss->privacy));
Simon Wunderlichcd7760e2013-08-28 13:41:31 +0200545 /* XXX: should not really modify cfg80211 data */
546 if (cbss) {
Luciano Coelho33787fc2013-11-11 20:34:54 +0200547 cbss->channel = sdata->csa_chandef.chan;
Simon Wunderlichcd7760e2013-08-28 13:41:31 +0200548 cfg80211_put_bss(sdata->local->hw.wiphy, cbss);
549 }
550 }
551
Luciano Coelho33787fc2013-11-11 20:34:54 +0200552 ifibss->chandef = sdata->csa_chandef;
Simon Wunderlichcd7760e2013-08-28 13:41:31 +0200553
554 /* generate the beacon */
Koen Vandeputte020fa0f2019-09-11 16:14:31 +0200555 return ieee80211_ibss_csa_beacon(sdata, NULL);
Simon Wunderlichcd7760e2013-08-28 13:41:31 +0200556}
557
558void ieee80211_ibss_stop(struct ieee80211_sub_if_data *sdata)
559{
560 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
561
562 cancel_work_sync(&ifibss->csa_connection_drop_work);
563}
564
Antonio Quartulli52874a52013-06-18 14:20:40 +0200565static struct sta_info *ieee80211_ibss_finish_sta(struct sta_info *sta)
Johannes Berg8bf11d82011-12-15 11:17:37 +0100566 __acquires(RCU)
567{
568 struct ieee80211_sub_if_data *sdata = sta->sdata;
569 u8 addr[ETH_ALEN];
570
571 memcpy(addr, sta->sta.addr, ETH_ALEN);
572
Johannes Bergbdcbd8e2012-06-22 11:29:50 +0200573 ibss_dbg(sdata, "Adding new IBSS station %pM\n", addr);
Johannes Berg8bf11d82011-12-15 11:17:37 +0100574
Johannes Berg83d5cc02012-01-12 09:31:10 +0100575 sta_info_pre_move_state(sta, IEEE80211_STA_AUTH);
576 sta_info_pre_move_state(sta, IEEE80211_STA_ASSOC);
Antonio Quartulli267335d2012-01-31 20:25:47 +0100577 /* authorize the station only if the network is not RSN protected. If
578 * not wait for the userspace to authorize it */
579 if (!sta->sdata->u.ibss.control_port)
580 sta_info_pre_move_state(sta, IEEE80211_STA_AUTHORIZED);
Johannes Berg8bf11d82011-12-15 11:17:37 +0100581
582 rate_control_rate_init(sta);
583
584 /* If it fails, maybe we raced another insertion? */
585 if (sta_info_insert_rcu(sta))
586 return sta_info_get(sdata, addr);
587 return sta;
588}
589
590static struct sta_info *
Antonio Quartulli52874a52013-06-18 14:20:40 +0200591ieee80211_ibss_add_sta(struct ieee80211_sub_if_data *sdata, const u8 *bssid,
592 const u8 *addr, u32 supp_rates)
Johannes Berg8bf11d82011-12-15 11:17:37 +0100593 __acquires(RCU)
594{
595 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
596 struct ieee80211_local *local = sdata->local;
597 struct sta_info *sta;
Johannes Berg55de9082012-07-26 17:24:39 +0200598 struct ieee80211_chanctx_conf *chanctx_conf;
Ashok Nagarajanb422c6cd2013-05-10 17:50:51 -0700599 struct ieee80211_supported_band *sband;
Simon Wunderlich74608ac2013-07-08 16:55:54 +0200600 enum nl80211_bss_scan_width scan_width;
Johannes Berg55de9082012-07-26 17:24:39 +0200601 int band;
Johannes Berg8bf11d82011-12-15 11:17:37 +0100602
603 /*
604 * XXX: Consider removing the least recently used entry and
605 * allow new one to be added.
606 */
607 if (local->num_sta >= IEEE80211_IBSS_MAX_STA_ENTRIES) {
Johannes Bergbdcbd8e2012-06-22 11:29:50 +0200608 net_info_ratelimited("%s: No room for a new IBSS STA entry %pM\n",
Joe Perchese87cc472012-05-13 21:56:26 +0000609 sdata->name, addr);
Johannes Berg8bf11d82011-12-15 11:17:37 +0100610 rcu_read_lock();
611 return NULL;
612 }
613
614 if (ifibss->state == IEEE80211_IBSS_MLME_SEARCH) {
615 rcu_read_lock();
616 return NULL;
617 }
618
Joe Perchesb203ca32012-05-08 18:56:52 +0000619 if (!ether_addr_equal(bssid, sdata->u.ibss.bssid)) {
Johannes Berg8bf11d82011-12-15 11:17:37 +0100620 rcu_read_lock();
621 return NULL;
622 }
623
Johannes Berg55de9082012-07-26 17:24:39 +0200624 rcu_read_lock();
625 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
626 if (WARN_ON_ONCE(!chanctx_conf))
627 return NULL;
Johannes Berg4bf88532012-11-09 11:39:59 +0100628 band = chanctx_conf->def.chan->band;
Simon Wunderlich74608ac2013-07-08 16:55:54 +0200629 scan_width = cfg80211_chandef_to_scan_width(&chanctx_conf->def);
Johannes Berg55de9082012-07-26 17:24:39 +0200630 rcu_read_unlock();
631
Johannes Berg8bf11d82011-12-15 11:17:37 +0100632 sta = sta_info_alloc(sdata, addr, GFP_KERNEL);
633 if (!sta) {
634 rcu_read_lock();
635 return NULL;
636 }
637
Johannes Berg8bf11d82011-12-15 11:17:37 +0100638 /* make sure mandatory rates are always added */
Ashok Nagarajanb422c6cd2013-05-10 17:50:51 -0700639 sband = local->hw.wiphy->bands[band];
Johannes Berg8bf11d82011-12-15 11:17:37 +0100640 sta->sta.supp_rates[band] = supp_rates |
Simon Wunderlich74608ac2013-07-08 16:55:54 +0200641 ieee80211_mandatory_rates(sband, scan_width);
Johannes Berg8bf11d82011-12-15 11:17:37 +0100642
Antonio Quartulli52874a52013-06-18 14:20:40 +0200643 return ieee80211_ibss_finish_sta(sta);
Antonio Quartulli6d810f12012-01-18 00:10:44 +0100644}
645
Simon Wunderlich871a4182013-08-28 13:41:30 +0200646static int ieee80211_sta_active_ibss(struct ieee80211_sub_if_data *sdata)
647{
648 struct ieee80211_local *local = sdata->local;
649 int active = 0;
650 struct sta_info *sta;
651
652 sdata_assert_lock(sdata);
653
654 rcu_read_lock();
655
656 list_for_each_entry_rcu(sta, &local->sta_list, list) {
Johannes Bergb8da6b62016-03-31 20:02:07 +0300657 unsigned long last_active = ieee80211_sta_last_active(sta);
658
Simon Wunderlich871a4182013-08-28 13:41:30 +0200659 if (sta->sdata == sdata &&
Johannes Bergb8da6b62016-03-31 20:02:07 +0300660 time_is_after_jiffies(last_active +
661 IEEE80211_IBSS_MERGE_INTERVAL)) {
Simon Wunderlich871a4182013-08-28 13:41:30 +0200662 active++;
663 break;
664 }
665 }
666
667 rcu_read_unlock();
668
669 return active;
670}
671
672static void ieee80211_ibss_disconnect(struct ieee80211_sub_if_data *sdata)
673{
674 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
675 struct ieee80211_local *local = sdata->local;
676 struct cfg80211_bss *cbss;
677 struct beacon_data *presp;
678 struct sta_info *sta;
Simon Wunderlich871a4182013-08-28 13:41:30 +0200679
Sujith Manoharand4c80d92014-01-30 14:17:28 +0530680 if (!is_zero_ether_addr(ifibss->bssid)) {
Simon Wunderlich871a4182013-08-28 13:41:30 +0200681 cbss = cfg80211_get_bss(local->hw.wiphy, ifibss->chandef.chan,
682 ifibss->bssid, ifibss->ssid,
Dedy Lansky6eb18132015-02-08 15:52:03 +0200683 ifibss->ssid_len,
684 IEEE80211_BSS_TYPE_IBSS,
685 IEEE80211_PRIVACY(ifibss->privacy));
Simon Wunderlich871a4182013-08-28 13:41:30 +0200686
687 if (cbss) {
688 cfg80211_unlink_bss(local->hw.wiphy, cbss);
689 cfg80211_put_bss(sdata->local->hw.wiphy, cbss);
690 }
691 }
692
693 ifibss->state = IEEE80211_IBSS_MLME_SEARCH;
694
695 sta_info_flush(sdata);
696
697 spin_lock_bh(&ifibss->incomplete_lock);
698 while (!list_empty(&ifibss->incomplete_stations)) {
699 sta = list_first_entry(&ifibss->incomplete_stations,
700 struct sta_info, list);
701 list_del(&sta->list);
702 spin_unlock_bh(&ifibss->incomplete_lock);
703
704 sta_info_free(local, sta);
705 spin_lock_bh(&ifibss->incomplete_lock);
706 }
707 spin_unlock_bh(&ifibss->incomplete_lock);
708
709 netif_carrier_off(sdata->dev);
710
711 sdata->vif.bss_conf.ibss_joined = false;
712 sdata->vif.bss_conf.ibss_creator = false;
713 sdata->vif.bss_conf.enable_beacon = false;
714 sdata->vif.bss_conf.ssid_len = 0;
715
716 /* remove beacon */
717 presp = rcu_dereference_protected(ifibss->presp,
718 lockdep_is_held(&sdata->wdev.mtx));
719 RCU_INIT_POINTER(sdata->u.ibss.presp, NULL);
720 if (presp)
721 kfree_rcu(presp, rcu_head);
722
723 clear_bit(SDATA_STATE_OFFCHANNEL_BEACON_STOPPED, &sdata->state);
724 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BEACON_ENABLED |
725 BSS_CHANGED_IBSS);
Johannes Berg55fff502013-08-19 18:48:41 +0200726 drv_leave_ibss(local, sdata);
Johannes Berg34a37402013-12-18 09:43:33 +0100727 mutex_lock(&local->mtx);
Simon Wunderlich871a4182013-08-28 13:41:30 +0200728 ieee80211_vif_release_channel(sdata);
Johannes Berg34a37402013-12-18 09:43:33 +0100729 mutex_unlock(&local->mtx);
Simon Wunderlich871a4182013-08-28 13:41:30 +0200730}
731
Simon Wunderlichcd7760e2013-08-28 13:41:31 +0200732static void ieee80211_csa_connection_drop_work(struct work_struct *work)
733{
734 struct ieee80211_sub_if_data *sdata =
735 container_of(work, struct ieee80211_sub_if_data,
736 u.ibss.csa_connection_drop_work);
737
Luciano Coelho6f07d212013-12-11 20:39:46 +0200738 sdata_lock(sdata);
739
Simon Wunderlichcd7760e2013-08-28 13:41:31 +0200740 ieee80211_ibss_disconnect(sdata);
741 synchronize_rcu();
742 skb_queue_purge(&sdata->skb_queue);
743
744 /* trigger a scan to find another IBSS network to join */
745 ieee80211_queue_work(&sdata->local->hw, &sdata->work);
Luciano Coelho6f07d212013-12-11 20:39:46 +0200746
747 sdata_unlock(sdata);
Simon Wunderlichcd7760e2013-08-28 13:41:31 +0200748}
749
Simon Wunderlich8e8d3472013-10-07 18:41:06 +0200750static void ieee80211_ibss_csa_mark_radar(struct ieee80211_sub_if_data *sdata)
751{
752 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
753 int err;
754
755 /* if the current channel is a DFS channel, mark the channel as
756 * unavailable.
757 */
758 err = cfg80211_chandef_dfs_required(sdata->local->hw.wiphy,
Luciano Coelho2beb6dab2014-02-18 11:40:36 +0200759 &ifibss->chandef,
760 NL80211_IFTYPE_ADHOC);
Simon Wunderlich8e8d3472013-10-07 18:41:06 +0200761 if (err > 0)
762 cfg80211_radar_event(sdata->local->hw.wiphy, &ifibss->chandef,
763 GFP_ATOMIC);
764}
765
Simon Wunderlichcd7760e2013-08-28 13:41:31 +0200766static bool
767ieee80211_ibss_process_chanswitch(struct ieee80211_sub_if_data *sdata,
768 struct ieee802_11_elems *elems,
769 bool beacon)
770{
771 struct cfg80211_csa_settings params;
Chun-Yeow Yeohc0f17eb2013-10-14 19:08:29 -0700772 struct ieee80211_csa_ie csa_ie;
Simon Wunderlichcd7760e2013-08-28 13:41:31 +0200773 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
Simon Wunderlichcd7760e2013-08-28 13:41:31 +0200774 enum nl80211_channel_type ch_type;
Luciano Coelho82a8e172013-12-13 21:13:50 +0200775 int err;
Simon Wunderlichcd7760e2013-08-28 13:41:31 +0200776 u32 sta_flags;
Johannes Berg2a333a02020-05-28 21:34:35 +0200777 u32 vht_cap_info = 0;
Simon Wunderlichcd7760e2013-08-28 13:41:31 +0200778
Michal Kaziordbd72852014-01-29 07:56:21 +0100779 sdata_assert_lock(sdata);
780
Simon Wunderlichcd7760e2013-08-28 13:41:31 +0200781 sta_flags = IEEE80211_STA_DISABLE_VHT;
782 switch (ifibss->chandef.width) {
783 case NL80211_CHAN_WIDTH_5:
784 case NL80211_CHAN_WIDTH_10:
785 case NL80211_CHAN_WIDTH_20_NOHT:
786 sta_flags |= IEEE80211_STA_DISABLE_HT;
Gustavo A. R. Silvafc0561d2020-07-07 15:45:48 -0500787 fallthrough;
Simon Wunderlichcd7760e2013-08-28 13:41:31 +0200788 case NL80211_CHAN_WIDTH_20:
789 sta_flags |= IEEE80211_STA_DISABLE_40MHZ;
790 break;
791 default:
792 break;
793 }
794
Johannes Berg2a333a02020-05-28 21:34:35 +0200795 if (elems->vht_cap_elem)
796 vht_cap_info = le32_to_cpu(elems->vht_cap_elem->vht_cap_info);
797
Simon Wunderlichcd7760e2013-08-28 13:41:31 +0200798 memset(&params, 0, sizeof(params));
Luciano Coelho84469a42014-10-28 13:33:04 +0200799 err = ieee80211_parse_ch_switch_ie(sdata, elems,
Simon Wunderlichcd7760e2013-08-28 13:41:31 +0200800 ifibss->chandef.chan->band,
Johannes Berg2a333a02020-05-28 21:34:35 +0200801 vht_cap_info,
Chun-Yeow Yeohc0f17eb2013-10-14 19:08:29 -0700802 sta_flags, ifibss->bssid, &csa_ie);
Simon Wunderlichcd7760e2013-08-28 13:41:31 +0200803 /* can't switch to destination channel, fail */
804 if (err < 0)
805 goto disconnect;
806
807 /* did not contain a CSA */
808 if (err)
809 return false;
810
Simon Wunderlich0834ae32013-11-26 16:45:18 +0100811 /* channel switch is not supported, disconnect */
812 if (!(sdata->local->hw.wiphy->flags & WIPHY_FLAG_HAS_CHANNEL_SWITCH))
813 goto disconnect;
814
Chun-Yeow Yeohc0f17eb2013-10-14 19:08:29 -0700815 params.count = csa_ie.count;
816 params.chandef = csa_ie.chandef;
817
Simon Wunderlichcd7760e2013-08-28 13:41:31 +0200818 switch (ifibss->chandef.width) {
819 case NL80211_CHAN_WIDTH_20_NOHT:
820 case NL80211_CHAN_WIDTH_20:
821 case NL80211_CHAN_WIDTH_40:
822 /* keep our current HT mode (HT20/HT40+/HT40-), even if
823 * another mode has been announced. The mode is not adopted
824 * within the beacon while doing CSA and we should therefore
825 * keep the mode which we announce.
826 */
827 ch_type = cfg80211_get_chandef_type(&ifibss->chandef);
828 cfg80211_chandef_create(&params.chandef, params.chandef.chan,
829 ch_type);
830 break;
831 case NL80211_CHAN_WIDTH_5:
832 case NL80211_CHAN_WIDTH_10:
833 if (params.chandef.width != ifibss->chandef.width) {
834 sdata_info(sdata,
835 "IBSS %pM received channel switch from incompatible channel width (%d MHz, width:%d, CF1/2: %d/%d MHz), disconnecting\n",
836 ifibss->bssid,
837 params.chandef.chan->center_freq,
838 params.chandef.width,
839 params.chandef.center_freq1,
840 params.chandef.center_freq2);
841 goto disconnect;
842 }
843 break;
844 default:
845 /* should not happen, sta_flags should prevent VHT modes. */
846 WARN_ON(1);
847 goto disconnect;
848 }
849
Ilan Peer174e0cd2014-02-23 09:13:01 +0200850 if (!cfg80211_reg_can_beacon(sdata->local->hw.wiphy, &params.chandef,
851 NL80211_IFTYPE_ADHOC)) {
Simon Wunderlichcd7760e2013-08-28 13:41:31 +0200852 sdata_info(sdata,
853 "IBSS %pM switches to unsupported channel (%d MHz, width:%d, CF1/2: %d/%d MHz), disconnecting\n",
854 ifibss->bssid,
855 params.chandef.chan->center_freq,
856 params.chandef.width,
857 params.chandef.center_freq1,
858 params.chandef.center_freq2);
859 goto disconnect;
860 }
861
862 err = cfg80211_chandef_dfs_required(sdata->local->hw.wiphy,
Luciano Coelho2beb6dab2014-02-18 11:40:36 +0200863 &params.chandef,
864 NL80211_IFTYPE_ADHOC);
Simon Wunderlichcd7760e2013-08-28 13:41:31 +0200865 if (err < 0)
866 goto disconnect;
Luciano Coelho2beb6dab2014-02-18 11:40:36 +0200867 if (err > 0 && !ifibss->userspace_handles_dfs) {
Simon Wunderlich8e8d3472013-10-07 18:41:06 +0200868 /* IBSS-DFS only allowed with a control program */
Luciano Coelho2beb6dab2014-02-18 11:40:36 +0200869 goto disconnect;
Simon Wunderlichcd7760e2013-08-28 13:41:31 +0200870 }
871
Luciano Coelho2beb6dab2014-02-18 11:40:36 +0200872 params.radar_required = err;
873
Luciano Coelho82a8e172013-12-13 21:13:50 +0200874 if (cfg80211_chandef_identical(&params.chandef,
875 &sdata->vif.bss_conf.chandef)) {
876 ibss_dbg(sdata,
877 "received csa with an identical chandef, ignoring\n");
878 return true;
Simon Wunderlichcd7760e2013-08-28 13:41:31 +0200879 }
880
Simon Wunderlichcd7760e2013-08-28 13:41:31 +0200881 /* all checks done, now perform the channel switch. */
882 ibss_dbg(sdata,
883 "received channel switch announcement to go to channel %d MHz\n",
884 params.chandef.chan->center_freq);
885
Chun-Yeow Yeohc0f17eb2013-10-14 19:08:29 -0700886 params.block_tx = !!csa_ie.mode;
Simon Wunderlichcd7760e2013-08-28 13:41:31 +0200887
Luciano Coelho82a8e172013-12-13 21:13:50 +0200888 if (ieee80211_channel_switch(sdata->local->hw.wiphy, sdata->dev,
889 &params))
890 goto disconnect;
Simon Wunderlichcd7760e2013-08-28 13:41:31 +0200891
Simon Wunderlich8e8d3472013-10-07 18:41:06 +0200892 ieee80211_ibss_csa_mark_radar(sdata);
893
Simon Wunderlichcd7760e2013-08-28 13:41:31 +0200894 return true;
895disconnect:
896 ibss_dbg(sdata, "Can't handle channel switch, disconnect\n");
897 ieee80211_queue_work(&sdata->local->hw,
898 &ifibss->csa_connection_drop_work);
899
Simon Wunderlich8e8d3472013-10-07 18:41:06 +0200900 ieee80211_ibss_csa_mark_radar(sdata);
901
Simon Wunderlichcd7760e2013-08-28 13:41:31 +0200902 return true;
903}
904
905static void
906ieee80211_rx_mgmt_spectrum_mgmt(struct ieee80211_sub_if_data *sdata,
907 struct ieee80211_mgmt *mgmt, size_t len,
908 struct ieee80211_rx_status *rx_status,
909 struct ieee802_11_elems *elems)
910{
911 int required_len;
912
913 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
914 return;
915
916 /* CSA is the only action we handle for now */
917 if (mgmt->u.action.u.measurement.action_code !=
918 WLAN_ACTION_SPCT_CHL_SWITCH)
919 return;
920
921 required_len = IEEE80211_MIN_ACTION_SIZE +
922 sizeof(mgmt->u.action.u.chan_switch);
923 if (len < required_len)
924 return;
925
Luciano Coelho82a8e172013-12-13 21:13:50 +0200926 if (!sdata->vif.csa_active)
927 ieee80211_ibss_process_chanswitch(sdata, elems, false);
Simon Wunderlichcd7760e2013-08-28 13:41:31 +0200928}
929
Antonio Quartulli2cc59e72012-09-07 13:28:53 +0200930static void ieee80211_rx_mgmt_deauth_ibss(struct ieee80211_sub_if_data *sdata,
931 struct ieee80211_mgmt *mgmt,
932 size_t len)
933{
934 u16 reason = le16_to_cpu(mgmt->u.deauth.reason_code);
935
936 if (len < IEEE80211_DEAUTH_FRAME_LEN)
937 return;
938
Emmanuel Grumbachc6e57b32018-08-31 11:31:13 +0300939 ibss_dbg(sdata, "RX DeAuth SA=%pM DA=%pM\n", mgmt->sa, mgmt->da);
940 ibss_dbg(sdata, "\tBSSID=%pM (reason: %d)\n", mgmt->bssid, reason);
Antonio Quartulli2cc59e72012-09-07 13:28:53 +0200941 sta_info_destroy_addr(sdata, mgmt->sa);
942}
943
Antonio Quartulli6d810f12012-01-18 00:10:44 +0100944static void ieee80211_rx_mgmt_auth_ibss(struct ieee80211_sub_if_data *sdata,
945 struct ieee80211_mgmt *mgmt,
946 size_t len)
947{
948 u16 auth_alg, auth_transaction;
949
Johannes Berg8d61ffa2013-05-10 12:32:47 +0200950 sdata_assert_lock(sdata);
Antonio Quartulli6d810f12012-01-18 00:10:44 +0100951
952 if (len < 24 + 6)
953 return;
954
955 auth_alg = le16_to_cpu(mgmt->u.auth.auth_alg);
956 auth_transaction = le16_to_cpu(mgmt->u.auth.auth_transaction);
957
Emmanuel Grumbachc6e57b32018-08-31 11:31:13 +0300958 ibss_dbg(sdata, "RX Auth SA=%pM DA=%pM\n", mgmt->sa, mgmt->da);
959 ibss_dbg(sdata, "\tBSSID=%pM (auth_transaction=%d)\n",
960 mgmt->bssid, auth_transaction);
Antonio Quartulli7bed2052012-11-25 23:24:27 +0100961
962 if (auth_alg != WLAN_AUTH_OPEN || auth_transaction != 1)
963 return;
964
Antonio Quartulli2cc59e72012-09-07 13:28:53 +0200965 /*
Antonio Quartulli6d810f12012-01-18 00:10:44 +0100966 * IEEE 802.11 standard does not require authentication in IBSS
967 * networks and most implementations do not seem to use it.
968 * However, try to reply to authentication attempts if someone
969 * has actually implemented this.
970 */
Jouni Malinen700e8ea2012-09-30 19:29:37 +0300971 ieee80211_send_auth(sdata, 2, WLAN_AUTH_OPEN, 0, NULL, 0,
Johannes Berg1672c0e32013-01-29 15:02:27 +0100972 mgmt->sa, sdata->u.ibss.bssid, NULL, 0, 0, 0);
Johannes Berg8bf11d82011-12-15 11:17:37 +0100973}
974
Janusz.Dziedzic@tieto.com8a4988d2015-03-09 07:58:15 +0100975static void ieee80211_update_sta_info(struct ieee80211_sub_if_data *sdata,
976 struct ieee80211_mgmt *mgmt, size_t len,
977 struct ieee80211_rx_status *rx_status,
978 struct ieee802_11_elems *elems,
979 struct ieee80211_channel *channel)
980{
981 struct sta_info *sta;
Johannes Berg57fbcce2016-04-12 15:56:15 +0200982 enum nl80211_band band = rx_status->band;
Janusz.Dziedzic@tieto.com8a4988d2015-03-09 07:58:15 +0100983 enum nl80211_bss_scan_width scan_width;
984 struct ieee80211_local *local = sdata->local;
Mohammed Shafi Shajakhan21a8e9d2017-04-27 12:45:38 +0530985 struct ieee80211_supported_band *sband;
Janusz.Dziedzic@tieto.com8a4988d2015-03-09 07:58:15 +0100986 bool rates_updated = false;
987 u32 supp_rates = 0;
988
989 if (sdata->vif.type != NL80211_IFTYPE_ADHOC)
990 return;
991
992 if (!ether_addr_equal(mgmt->bssid, sdata->u.ibss.bssid))
993 return;
994
Mohammed Shafi Shajakhan21a8e9d2017-04-27 12:45:38 +0530995 sband = local->hw.wiphy->bands[band];
996 if (WARN_ON(!sband))
997 return;
998
Janusz.Dziedzic@tieto.com8a4988d2015-03-09 07:58:15 +0100999 rcu_read_lock();
1000 sta = sta_info_get(sdata, mgmt->sa);
1001
1002 if (elems->supp_rates) {
1003 supp_rates = ieee80211_sta_get_rates(sdata, elems,
1004 band, NULL);
1005 if (sta) {
1006 u32 prev_rates;
1007
1008 prev_rates = sta->sta.supp_rates[band];
1009 /* make sure mandatory rates are always added */
1010 scan_width = NL80211_BSS_CHAN_WIDTH_20;
Johannes Bergda6a4352017-04-26 12:14:59 +02001011 if (rx_status->bw == RATE_INFO_BW_5)
Janusz.Dziedzic@tieto.com8a4988d2015-03-09 07:58:15 +01001012 scan_width = NL80211_BSS_CHAN_WIDTH_5;
Johannes Bergda6a4352017-04-26 12:14:59 +02001013 else if (rx_status->bw == RATE_INFO_BW_10)
Janusz.Dziedzic@tieto.com8a4988d2015-03-09 07:58:15 +01001014 scan_width = NL80211_BSS_CHAN_WIDTH_10;
1015
1016 sta->sta.supp_rates[band] = supp_rates |
1017 ieee80211_mandatory_rates(sband, scan_width);
1018 if (sta->sta.supp_rates[band] != prev_rates) {
1019 ibss_dbg(sdata,
1020 "updated supp_rates set for %pM based on beacon/probe_resp (0x%x -> 0x%x)\n",
1021 sta->sta.addr, prev_rates,
1022 sta->sta.supp_rates[band]);
1023 rates_updated = true;
1024 }
1025 } else {
1026 rcu_read_unlock();
1027 sta = ieee80211_ibss_add_sta(sdata, mgmt->bssid,
1028 mgmt->sa, supp_rates);
1029 }
1030 }
1031
Johannes Berg96a4688e2015-05-11 14:01:36 +02001032 if (sta && !sta->sta.wme &&
Thomas Pedersen1d00ce82020-09-21 19:28:15 -07001033 (elems->wmm_info || elems->s1g_capab) &&
1034 local->hw.queues >= IEEE80211_NUM_ACS) {
Janusz.Dziedzic@tieto.com8a4988d2015-03-09 07:58:15 +01001035 sta->sta.wme = true;
Johannes Berg96a4688e2015-05-11 14:01:36 +02001036 ieee80211_check_fast_xmit(sta);
1037 }
Janusz.Dziedzic@tieto.com8a4988d2015-03-09 07:58:15 +01001038
1039 if (sta && elems->ht_operation && elems->ht_cap_elem &&
1040 sdata->u.ibss.chandef.width != NL80211_CHAN_WIDTH_20_NOHT &&
1041 sdata->u.ibss.chandef.width != NL80211_CHAN_WIDTH_5 &&
1042 sdata->u.ibss.chandef.width != NL80211_CHAN_WIDTH_10) {
1043 /* we both use HT */
1044 struct ieee80211_ht_cap htcap_ie;
1045 struct cfg80211_chan_def chandef;
Janusz.Dziedzic@tieto.comabcff6e2015-03-20 06:37:01 +01001046 enum ieee80211_sta_rx_bandwidth bw = sta->sta.bandwidth;
Janusz.Dziedzic@tieto.com8a4988d2015-03-09 07:58:15 +01001047
Johannes Berg8ac3c7042015-12-18 15:08:34 +01001048 cfg80211_chandef_create(&chandef, channel, NL80211_CHAN_NO_HT);
1049 ieee80211_chandef_ht_oper(elems->ht_operation, &chandef);
Janusz.Dziedzic@tieto.com8a4988d2015-03-09 07:58:15 +01001050
1051 memcpy(&htcap_ie, elems->ht_cap_elem, sizeof(htcap_ie));
Janusz.Dziedzic@tieto.com8a4988d2015-03-09 07:58:15 +01001052 rates_updated |= ieee80211_ht_cap_ie_to_sta_ht_cap(sdata, sband,
1053 &htcap_ie,
1054 sta);
Janusz.Dziedzic@tieto.comabcff6e2015-03-20 06:37:01 +01001055
1056 if (elems->vht_operation && elems->vht_cap_elem &&
1057 sdata->u.ibss.chandef.width != NL80211_CHAN_WIDTH_20 &&
1058 sdata->u.ibss.chandef.width != NL80211_CHAN_WIDTH_40) {
1059 /* we both use VHT */
1060 struct ieee80211_vht_cap cap_ie;
1061 struct ieee80211_sta_vht_cap cap = sta->sta.vht_cap;
Johannes Berg2a333a02020-05-28 21:34:35 +02001062 u32 vht_cap_info =
1063 le32_to_cpu(elems->vht_cap_elem->vht_cap_info);
Janusz.Dziedzic@tieto.comabcff6e2015-03-20 06:37:01 +01001064
Johannes Berg2a333a02020-05-28 21:34:35 +02001065 ieee80211_chandef_vht_oper(&local->hw, vht_cap_info,
Johannes Berg7eb26df2018-08-31 11:31:18 +03001066 elems->vht_operation,
1067 elems->ht_operation,
Johannes Berg8ac3c7042015-12-18 15:08:34 +01001068 &chandef);
Janusz.Dziedzic@tieto.comabcff6e2015-03-20 06:37:01 +01001069 memcpy(&cap_ie, elems->vht_cap_elem, sizeof(cap_ie));
1070 ieee80211_vht_cap_ie_to_sta_vht_cap(sdata, sband,
1071 &cap_ie, sta);
1072 if (memcmp(&cap, &sta->sta.vht_cap, sizeof(cap)))
1073 rates_updated |= true;
1074 }
1075
1076 if (bw != sta->sta.bandwidth)
1077 rates_updated |= true;
1078
1079 if (!cfg80211_chandef_compatible(&sdata->u.ibss.chandef,
1080 &chandef))
1081 WARN_ON_ONCE(1);
Janusz.Dziedzic@tieto.com8a4988d2015-03-09 07:58:15 +01001082 }
1083
1084 if (sta && rates_updated) {
1085 u32 changed = IEEE80211_RC_SUPP_RATES_CHANGED;
1086 u8 rx_nss = sta->sta.rx_nss;
1087
1088 /* Force rx_nss recalculation */
1089 sta->sta.rx_nss = 0;
1090 rate_control_rate_init(sta);
1091 if (sta->sta.rx_nss != rx_nss)
1092 changed |= IEEE80211_RC_NSS_CHANGED;
1093
1094 drv_sta_rc_update(local, sdata, &sta->sta, changed);
1095 }
1096
1097 rcu_read_unlock();
1098}
1099
Johannes Berg46900292009-02-15 12:44:28 +01001100static void ieee80211_rx_bss_info(struct ieee80211_sub_if_data *sdata,
Emmanuel Grumbachd45c4172012-12-10 16:19:13 +02001101 struct ieee80211_mgmt *mgmt, size_t len,
Johannes Berg46900292009-02-15 12:44:28 +01001102 struct ieee80211_rx_status *rx_status,
Emmanuel Grumbachd45c4172012-12-10 16:19:13 +02001103 struct ieee802_11_elems *elems)
Johannes Berg46900292009-02-15 12:44:28 +01001104{
1105 struct ieee80211_local *local = sdata->local;
Johannes Berg0c1ad2c2009-12-23 13:15:39 +01001106 struct cfg80211_bss *cbss;
Johannes Berg46900292009-02-15 12:44:28 +01001107 struct ieee80211_bss *bss;
Johannes Berg46900292009-02-15 12:44:28 +01001108 struct ieee80211_channel *channel;
1109 u64 beacon_timestamp, rx_timestamp;
1110 u32 supp_rates = 0;
Johannes Berg57fbcce2016-04-12 15:56:15 +02001111 enum nl80211_band band = rx_status->band;
Johannes Berg46900292009-02-15 12:44:28 +01001112
Emmanuel Grumbach3afc2162014-03-04 16:50:13 +02001113 channel = ieee80211_get_channel(local->hw.wiphy, rx_status->freq);
1114 if (!channel)
Johannes Berg46900292009-02-15 12:44:28 +01001115 return;
1116
Janusz.Dziedzic@tieto.com8a4988d2015-03-09 07:58:15 +01001117 ieee80211_update_sta_info(sdata, mgmt, len, rx_status, elems, channel);
Johannes Berg46900292009-02-15 12:44:28 +01001118
Sara Sharon4abb52a2019-01-16 12:14:41 +02001119 bss = ieee80211_bss_info_update(local, rx_status, mgmt, len, channel);
Johannes Berg46900292009-02-15 12:44:28 +01001120 if (!bss)
1121 return;
1122
Johannes Berg0c1ad2c2009-12-23 13:15:39 +01001123 cbss = container_of((void *)bss, struct cfg80211_bss, priv);
1124
Johannes Berg8cef2c92013-02-05 16:54:31 +01001125 /* same for beacon and probe response */
1126 beacon_timestamp = le64_to_cpu(mgmt->u.beacon.timestamp);
Johannes Berg46900292009-02-15 12:44:28 +01001127
1128 /* check if we need to merge IBSS */
1129
Johannes Berg46900292009-02-15 12:44:28 +01001130 /* not an IBSS */
Johannes Berg0c1ad2c2009-12-23 13:15:39 +01001131 if (!(cbss->capability & WLAN_CAPABILITY_IBSS))
Johannes Berg46900292009-02-15 12:44:28 +01001132 goto put_bss;
1133
1134 /* different channel */
Johannes Berg55de9082012-07-26 17:24:39 +02001135 if (sdata->u.ibss.fixed_channel &&
Simon Wunderlich3aede782013-05-16 13:00:36 +02001136 sdata->u.ibss.chandef.chan != cbss->channel)
Johannes Berg46900292009-02-15 12:44:28 +01001137 goto put_bss;
1138
1139 /* different SSID */
1140 if (elems->ssid_len != sdata->u.ibss.ssid_len ||
1141 memcmp(elems->ssid, sdata->u.ibss.ssid,
1142 sdata->u.ibss.ssid_len))
1143 goto put_bss;
1144
Simon Wunderlichcd7760e2013-08-28 13:41:31 +02001145 /* process channel switch */
Luciano Coelho82a8e172013-12-13 21:13:50 +02001146 if (sdata->vif.csa_active ||
1147 ieee80211_ibss_process_chanswitch(sdata, elems, true))
Simon Wunderlichcd7760e2013-08-28 13:41:31 +02001148 goto put_bss;
1149
Alina Friedrichsen34e8f082009-02-22 00:07:28 +01001150 /* same BSSID */
Joe Perchesb203ca32012-05-08 18:56:52 +00001151 if (ether_addr_equal(cbss->bssid, sdata->u.ibss.bssid))
Alina Friedrichsen34e8f082009-02-22 00:07:28 +01001152 goto put_bss;
1153
Simon Wunderlichcd7760e2013-08-28 13:41:31 +02001154 /* we use a fixed BSSID */
1155 if (sdata->u.ibss.fixed_bssid)
1156 goto put_bss;
1157
Thomas Pedersenf4bda332012-11-13 10:46:27 -08001158 if (ieee80211_have_rx_timestamp(rx_status)) {
1159 /* time when timestamp field was received */
1160 rx_timestamp =
1161 ieee80211_calculate_rx_timestamp(local, rx_status,
1162 len + FCS_LEN, 24);
Johannes Berg24487982009-04-23 18:52:52 +02001163 } else {
1164 /*
1165 * second best option: get current TSF
1166 * (will return -1 if not supported)
1167 */
Eliad Peller37a41b42011-09-21 14:06:11 +03001168 rx_timestamp = drv_get_tsf(local, sdata);
Johannes Berg24487982009-04-23 18:52:52 +02001169 }
Johannes Berg46900292009-02-15 12:44:28 +01001170
Emmanuel Grumbachc6e57b32018-08-31 11:31:13 +03001171 ibss_dbg(sdata, "RX beacon SA=%pM BSSID=%pM TSF=0x%llx\n",
Johannes Bergbdcbd8e2012-06-22 11:29:50 +02001172 mgmt->sa, mgmt->bssid,
Emmanuel Grumbachc6e57b32018-08-31 11:31:13 +03001173 (unsigned long long)rx_timestamp);
1174 ibss_dbg(sdata, "\tBCN=0x%llx diff=%lld @%lu\n",
Johannes Bergbdcbd8e2012-06-22 11:29:50 +02001175 (unsigned long long)beacon_timestamp,
1176 (unsigned long long)(rx_timestamp - beacon_timestamp),
1177 jiffies);
Johannes Berg46900292009-02-15 12:44:28 +01001178
1179 if (beacon_timestamp > rx_timestamp) {
Johannes Bergbdcbd8e2012-06-22 11:29:50 +02001180 ibss_dbg(sdata,
1181 "beacon TSF higher than local TSF - IBSS merge with BSSID %pM\n",
1182 mgmt->bssid);
Johannes Berg46900292009-02-15 12:44:28 +01001183 ieee80211_sta_join_ibss(sdata, bss);
Simon Wunderlich2103dec2013-07-08 16:55:53 +02001184 supp_rates = ieee80211_sta_get_rates(sdata, elems, band, NULL);
Johannes Berg34e89502010-02-03 13:59:58 +01001185 ieee80211_ibss_add_sta(sdata, mgmt->bssid, mgmt->sa,
Antonio Quartulli52874a52013-06-18 14:20:40 +02001186 supp_rates);
Johannes Berg8bf11d82011-12-15 11:17:37 +01001187 rcu_read_unlock();
Johannes Berg46900292009-02-15 12:44:28 +01001188 }
1189
1190 put_bss:
1191 ieee80211_rx_bss_put(local, bss);
1192}
1193
Johannes Berg8bf11d82011-12-15 11:17:37 +01001194void ieee80211_ibss_rx_no_sta(struct ieee80211_sub_if_data *sdata,
1195 const u8 *bssid, const u8 *addr,
1196 u32 supp_rates)
Johannes Berg46900292009-02-15 12:44:28 +01001197{
Felix Fietkau2e10d332009-12-20 19:07:09 +01001198 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
Johannes Berg46900292009-02-15 12:44:28 +01001199 struct ieee80211_local *local = sdata->local;
1200 struct sta_info *sta;
Johannes Berg55de9082012-07-26 17:24:39 +02001201 struct ieee80211_chanctx_conf *chanctx_conf;
Ashok Nagarajanb422c6cd2013-05-10 17:50:51 -07001202 struct ieee80211_supported_band *sband;
Simon Wunderlich74608ac2013-07-08 16:55:54 +02001203 enum nl80211_bss_scan_width scan_width;
Johannes Berg55de9082012-07-26 17:24:39 +02001204 int band;
Johannes Berg46900292009-02-15 12:44:28 +01001205
Johannes Bergaf8cdcd2009-04-19 21:25:43 +02001206 /*
1207 * XXX: Consider removing the least recently used entry and
1208 * allow new one to be added.
1209 */
Johannes Berg46900292009-02-15 12:44:28 +01001210 if (local->num_sta >= IEEE80211_IBSS_MAX_STA_ENTRIES) {
Johannes Bergbdcbd8e2012-06-22 11:29:50 +02001211 net_info_ratelimited("%s: No room for a new IBSS STA entry %pM\n",
Joe Perchese87cc472012-05-13 21:56:26 +00001212 sdata->name, addr);
Johannes Berg8bf11d82011-12-15 11:17:37 +01001213 return;
Johannes Berg46900292009-02-15 12:44:28 +01001214 }
1215
Felix Fietkau2e10d332009-12-20 19:07:09 +01001216 if (ifibss->state == IEEE80211_IBSS_MLME_SEARCH)
Johannes Berg8bf11d82011-12-15 11:17:37 +01001217 return;
Felix Fietkau2e10d332009-12-20 19:07:09 +01001218
Joe Perchesb203ca32012-05-08 18:56:52 +00001219 if (!ether_addr_equal(bssid, sdata->u.ibss.bssid))
Johannes Berg8bf11d82011-12-15 11:17:37 +01001220 return;
Johannes Berg46900292009-02-15 12:44:28 +01001221
Johannes Berg55de9082012-07-26 17:24:39 +02001222 rcu_read_lock();
1223 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
1224 if (WARN_ON_ONCE(!chanctx_conf)) {
1225 rcu_read_unlock();
1226 return;
1227 }
Johannes Berg4bf88532012-11-09 11:39:59 +01001228 band = chanctx_conf->def.chan->band;
Simon Wunderlich74608ac2013-07-08 16:55:54 +02001229 scan_width = cfg80211_chandef_to_scan_width(&chanctx_conf->def);
Johannes Berg55de9082012-07-26 17:24:39 +02001230 rcu_read_unlock();
1231
Johannes Berg8bf11d82011-12-15 11:17:37 +01001232 sta = sta_info_alloc(sdata, addr, GFP_ATOMIC);
Johannes Berg46900292009-02-15 12:44:28 +01001233 if (!sta)
Johannes Berg8bf11d82011-12-15 11:17:37 +01001234 return;
Johannes Berg46900292009-02-15 12:44:28 +01001235
Johannes Berg46900292009-02-15 12:44:28 +01001236 /* make sure mandatory rates are always added */
Ashok Nagarajanb422c6cd2013-05-10 17:50:51 -07001237 sband = local->hw.wiphy->bands[band];
Johannes Berg46900292009-02-15 12:44:28 +01001238 sta->sta.supp_rates[band] = supp_rates |
Simon Wunderlich74608ac2013-07-08 16:55:54 +02001239 ieee80211_mandatory_rates(sband, scan_width);
Johannes Berg46900292009-02-15 12:44:28 +01001240
Johannes Berg8bf11d82011-12-15 11:17:37 +01001241 spin_lock(&ifibss->incomplete_lock);
1242 list_add(&sta->list, &ifibss->incomplete_stations);
1243 spin_unlock(&ifibss->incomplete_lock);
1244 ieee80211_queue_work(&local->hw, &sdata->work);
Johannes Berg46900292009-02-15 12:44:28 +01001245}
1246
Antonio Quartullidad9def2013-07-26 21:15:02 +02001247static void ieee80211_ibss_sta_expire(struct ieee80211_sub_if_data *sdata)
1248{
Johannes Berg4b08d1b2019-08-30 14:24:51 +03001249 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
Antonio Quartullidad9def2013-07-26 21:15:02 +02001250 struct ieee80211_local *local = sdata->local;
1251 struct sta_info *sta, *tmp;
1252 unsigned long exp_time = IEEE80211_IBSS_INACTIVITY_LIMIT;
Johannes Berge5a9f8d2015-10-16 17:54:47 +02001253 unsigned long exp_rsn = IEEE80211_IBSS_RSN_INACTIVITY_LIMIT;
Antonio Quartullidad9def2013-07-26 21:15:02 +02001254
1255 mutex_lock(&local->sta_mtx);
1256
1257 list_for_each_entry_safe(sta, tmp, &local->sta_list, list) {
Johannes Bergb8da6b62016-03-31 20:02:07 +03001258 unsigned long last_active = ieee80211_sta_last_active(sta);
1259
Antonio Quartullidad9def2013-07-26 21:15:02 +02001260 if (sdata != sta->sdata)
1261 continue;
1262
Johannes Bergb8da6b62016-03-31 20:02:07 +03001263 if (time_is_before_jiffies(last_active + exp_time) ||
1264 (time_is_before_jiffies(last_active + exp_rsn) &&
Antonio Quartullidad9def2013-07-26 21:15:02 +02001265 sta->sta_state != IEEE80211_STA_AUTHORIZED)) {
Johannes Berg4b08d1b2019-08-30 14:24:51 +03001266 u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
1267
Antonio Quartullidad9def2013-07-26 21:15:02 +02001268 sta_dbg(sta->sdata, "expiring inactive %sSTA %pM\n",
1269 sta->sta_state != IEEE80211_STA_AUTHORIZED ?
1270 "not authorized " : "", sta->sta.addr);
1271
Johannes Berg4b08d1b2019-08-30 14:24:51 +03001272 ieee80211_send_deauth_disassoc(sdata, sta->sta.addr,
1273 ifibss->bssid,
1274 IEEE80211_STYPE_DEAUTH,
1275 WLAN_REASON_DEAUTH_LEAVING,
1276 true, frame_buf);
Antonio Quartullidad9def2013-07-26 21:15:02 +02001277 WARN_ON(__sta_info_destroy(sta));
1278 }
1279 }
1280
1281 mutex_unlock(&local->sta_mtx);
1282}
1283
Benoit Papillaultce9058a2010-01-17 22:45:23 +01001284/*
1285 * This function is called with state == IEEE80211_IBSS_MLME_JOINED
1286 */
Johannes Berg46900292009-02-15 12:44:28 +01001287
1288static void ieee80211_sta_merge_ibss(struct ieee80211_sub_if_data *sdata)
1289{
1290 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
Simon Wunderlich7ca15a02013-07-08 16:55:56 +02001291 enum nl80211_bss_scan_width scan_width;
Johannes Berg46900292009-02-15 12:44:28 +01001292
Johannes Berg8d61ffa2013-05-10 12:32:47 +02001293 sdata_assert_lock(sdata);
Johannes Berg7a17a332010-07-21 11:30:27 +02001294
Johannes Bergaf8cdcd2009-04-19 21:25:43 +02001295 mod_timer(&ifibss->timer,
1296 round_jiffies(jiffies + IEEE80211_IBSS_MERGE_INTERVAL));
Johannes Berg46900292009-02-15 12:44:28 +01001297
Antonio Quartullidad9def2013-07-26 21:15:02 +02001298 ieee80211_ibss_sta_expire(sdata);
Johannes Bergaf8cdcd2009-04-19 21:25:43 +02001299
Sujith450aae32009-11-02 12:33:23 +05301300 if (time_before(jiffies, ifibss->last_scan_completed +
1301 IEEE80211_IBSS_MERGE_INTERVAL))
1302 return;
1303
Johannes Berg46900292009-02-15 12:44:28 +01001304 if (ieee80211_sta_active_ibss(sdata))
1305 return;
1306
John W. Linvillec037b832012-01-30 15:28:11 -05001307 if (ifibss->fixed_channel)
Johannes Berg46900292009-02-15 12:44:28 +01001308 return;
1309
Johannes Bergbdcbd8e2012-06-22 11:29:50 +02001310 sdata_info(sdata,
1311 "No active IBSS STAs - trying to scan for other IBSS networks with same SSID (merge)\n");
Johannes Berg46900292009-02-15 12:44:28 +01001312
Simon Wunderlich7ca15a02013-07-08 16:55:56 +02001313 scan_width = cfg80211_chandef_to_scan_width(&ifibss->chandef);
Stanislaw Gruszka34bcf712012-12-11 10:48:23 +01001314 ieee80211_request_ibss_scan(sdata, ifibss->ssid, ifibss->ssid_len,
Janusz.Dziedzic@tieto.com76bed0f2015-03-20 06:37:00 +01001315 NULL, 0, scan_width);
Johannes Berg46900292009-02-15 12:44:28 +01001316}
1317
Johannes Bergaf8cdcd2009-04-19 21:25:43 +02001318static void ieee80211_sta_create_ibss(struct ieee80211_sub_if_data *sdata)
Johannes Berg46900292009-02-15 12:44:28 +01001319{
1320 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
Johannes Berg46900292009-02-15 12:44:28 +01001321 u8 bssid[ETH_ALEN];
Johannes Berg46900292009-02-15 12:44:28 +01001322 u16 capability;
1323 int i;
1324
Johannes Berg8d61ffa2013-05-10 12:32:47 +02001325 sdata_assert_lock(sdata);
Johannes Berg7a17a332010-07-21 11:30:27 +02001326
Johannes Bergaf8cdcd2009-04-19 21:25:43 +02001327 if (ifibss->fixed_bssid) {
Johannes Berg46900292009-02-15 12:44:28 +01001328 memcpy(bssid, ifibss->bssid, ETH_ALEN);
1329 } else {
1330 /* Generate random, not broadcast, locally administered BSSID. Mix in
1331 * own MAC address to make sure that devices that do not have proper
1332 * random number generator get different BSSID. */
1333 get_random_bytes(bssid, ETH_ALEN);
1334 for (i = 0; i < ETH_ALEN; i++)
Johannes Berg47846c92009-11-25 17:46:19 +01001335 bssid[i] ^= sdata->vif.addr[i];
Johannes Berg46900292009-02-15 12:44:28 +01001336 bssid[0] &= ~0x01;
1337 bssid[0] |= 0x02;
1338 }
1339
Johannes Bergbdcbd8e2012-06-22 11:29:50 +02001340 sdata_info(sdata, "Creating new IBSS network, BSSID %pM\n", bssid);
Johannes Berg46900292009-02-15 12:44:28 +01001341
Johannes Berg46900292009-02-15 12:44:28 +01001342 capability = WLAN_CAPABILITY_IBSS;
1343
Johannes Bergfffd0932009-07-08 14:22:54 +02001344 if (ifibss->privacy)
Johannes Berg46900292009-02-15 12:44:28 +01001345 capability |= WLAN_CAPABILITY_PRIVACY;
Johannes Berg46900292009-02-15 12:44:28 +01001346
Johannes Berg57c4d7b2009-04-23 16:10:04 +02001347 __ieee80211_sta_join_ibss(sdata, bssid, sdata->vif.bss_conf.beacon_int,
Simon Wunderlich75a423f2013-08-21 15:30:25 +02001348 &ifibss->chandef, ifibss->basic_rates,
Sujith Manoharanc13a7652012-10-12 17:35:45 +05301349 capability, 0, true);
Johannes Berg46900292009-02-15 12:44:28 +01001350}
1351
Janusz.Dziedzic@tieto.com76bed0f2015-03-20 06:37:00 +01001352static unsigned ibss_setup_channels(struct wiphy *wiphy,
1353 struct ieee80211_channel **channels,
1354 unsigned int channels_max,
1355 u32 center_freq, u32 width)
1356{
1357 struct ieee80211_channel *chan = NULL;
1358 unsigned int n_chan = 0;
1359 u32 start_freq, end_freq, freq;
1360
1361 if (width <= 20) {
1362 start_freq = center_freq;
1363 end_freq = center_freq;
1364 } else {
1365 start_freq = center_freq - width / 2 + 10;
1366 end_freq = center_freq + width / 2 - 10;
1367 }
1368
1369 for (freq = start_freq; freq <= end_freq; freq += 20) {
1370 chan = ieee80211_get_channel(wiphy, freq);
1371 if (!chan)
1372 continue;
1373 if (n_chan >= channels_max)
1374 return n_chan;
1375
1376 channels[n_chan] = chan;
1377 n_chan++;
1378 }
1379
1380 return n_chan;
1381}
1382
1383static unsigned int
1384ieee80211_ibss_setup_scan_channels(struct wiphy *wiphy,
1385 const struct cfg80211_chan_def *chandef,
1386 struct ieee80211_channel **channels,
1387 unsigned int channels_max)
1388{
1389 unsigned int n_chan = 0;
1390 u32 width, cf1, cf2 = 0;
1391
1392 switch (chandef->width) {
1393 case NL80211_CHAN_WIDTH_40:
1394 width = 40;
1395 break;
1396 case NL80211_CHAN_WIDTH_80P80:
1397 cf2 = chandef->center_freq2;
Gustavo A. R. Silvafc0561d2020-07-07 15:45:48 -05001398 fallthrough;
Janusz.Dziedzic@tieto.com76bed0f2015-03-20 06:37:00 +01001399 case NL80211_CHAN_WIDTH_80:
1400 width = 80;
1401 break;
1402 case NL80211_CHAN_WIDTH_160:
1403 width = 160;
1404 break;
1405 default:
1406 width = 20;
1407 break;
1408 }
1409
1410 cf1 = chandef->center_freq1;
1411
1412 n_chan = ibss_setup_channels(wiphy, channels, channels_max, cf1, width);
1413
1414 if (cf2)
1415 n_chan += ibss_setup_channels(wiphy, &channels[n_chan],
1416 channels_max - n_chan, cf2,
1417 width);
1418
1419 return n_chan;
1420}
1421
Benoit Papillaultce9058a2010-01-17 22:45:23 +01001422/*
1423 * This function is called with state == IEEE80211_IBSS_MLME_SEARCH
1424 */
1425
Johannes Bergaf8cdcd2009-04-19 21:25:43 +02001426static void ieee80211_sta_find_ibss(struct ieee80211_sub_if_data *sdata)
Johannes Berg46900292009-02-15 12:44:28 +01001427{
1428 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1429 struct ieee80211_local *local = sdata->local;
Johannes Berg0c1ad2c2009-12-23 13:15:39 +01001430 struct cfg80211_bss *cbss;
Johannes Bergaf8cdcd2009-04-19 21:25:43 +02001431 struct ieee80211_channel *chan = NULL;
Johannes Berg46900292009-02-15 12:44:28 +01001432 const u8 *bssid = NULL;
Simon Wunderlich7ca15a02013-07-08 16:55:56 +02001433 enum nl80211_bss_scan_width scan_width;
Johannes Berg46900292009-02-15 12:44:28 +01001434 int active_ibss;
1435
Johannes Berg8d61ffa2013-05-10 12:32:47 +02001436 sdata_assert_lock(sdata);
Johannes Berg7a17a332010-07-21 11:30:27 +02001437
Johannes Berg46900292009-02-15 12:44:28 +01001438 active_ibss = ieee80211_sta_active_ibss(sdata);
Johannes Bergbdcbd8e2012-06-22 11:29:50 +02001439 ibss_dbg(sdata, "sta_find_ibss (active_ibss=%d)\n", active_ibss);
Johannes Berg46900292009-02-15 12:44:28 +01001440
1441 if (active_ibss)
Johannes Bergaf8cdcd2009-04-19 21:25:43 +02001442 return;
Johannes Berg46900292009-02-15 12:44:28 +01001443
Johannes Bergaf8cdcd2009-04-19 21:25:43 +02001444 if (ifibss->fixed_bssid)
Johannes Berg46900292009-02-15 12:44:28 +01001445 bssid = ifibss->bssid;
Johannes Bergaf8cdcd2009-04-19 21:25:43 +02001446 if (ifibss->fixed_channel)
Simon Wunderlich3aede782013-05-16 13:00:36 +02001447 chan = ifibss->chandef.chan;
Johannes Bergaf8cdcd2009-04-19 21:25:43 +02001448 if (!is_zero_ether_addr(ifibss->bssid))
1449 bssid = ifibss->bssid;
Johannes Berg0c1ad2c2009-12-23 13:15:39 +01001450 cbss = cfg80211_get_bss(local->hw.wiphy, chan, bssid,
1451 ifibss->ssid, ifibss->ssid_len,
Dedy Lansky6eb18132015-02-08 15:52:03 +02001452 IEEE80211_BSS_TYPE_IBSS,
1453 IEEE80211_PRIVACY(ifibss->privacy));
Johannes Berg46900292009-02-15 12:44:28 +01001454
Johannes Berg0c1ad2c2009-12-23 13:15:39 +01001455 if (cbss) {
1456 struct ieee80211_bss *bss;
1457
1458 bss = (void *)cbss->priv;
Johannes Bergbdcbd8e2012-06-22 11:29:50 +02001459 ibss_dbg(sdata,
1460 "sta_find_ibss: selected %pM current %pM\n",
1461 cbss->bssid, ifibss->bssid);
1462 sdata_info(sdata,
1463 "Selected IBSS BSSID %pM based on configured SSID\n",
1464 cbss->bssid);
Johannes Berg46900292009-02-15 12:44:28 +01001465
Johannes Bergaf8cdcd2009-04-19 21:25:43 +02001466 ieee80211_sta_join_ibss(sdata, bss);
Johannes Berg46900292009-02-15 12:44:28 +01001467 ieee80211_rx_bss_put(local, bss);
Johannes Bergaf8cdcd2009-04-19 21:25:43 +02001468 return;
Reinette Chatred419b9f2009-10-19 14:55:37 -07001469 }
Johannes Berg46900292009-02-15 12:44:28 +01001470
Antonio Quartullid8eb7412013-08-09 18:58:32 +02001471 /* if a fixed bssid and a fixed freq have been provided create the IBSS
1472 * directly and do not waste time scanning
1473 */
1474 if (ifibss->fixed_bssid && ifibss->fixed_channel) {
1475 sdata_info(sdata, "Created IBSS using preconfigured BSSID %pM\n",
1476 bssid);
1477 ieee80211_sta_create_ibss(sdata);
1478 return;
1479 }
1480
1481
Johannes Bergbdcbd8e2012-06-22 11:29:50 +02001482 ibss_dbg(sdata, "sta_find_ibss: did not try to join ibss\n");
Johannes Berg46900292009-02-15 12:44:28 +01001483
1484 /* Selected IBSS not found in current scan results - try to scan */
Benoit Papillaultce9058a2010-01-17 22:45:23 +01001485 if (time_after(jiffies, ifibss->last_scan_completed +
Johannes Berg46900292009-02-15 12:44:28 +01001486 IEEE80211_SCAN_INTERVAL)) {
Janusz.Dziedzic@tieto.com76bed0f2015-03-20 06:37:00 +01001487 struct ieee80211_channel *channels[8];
1488 unsigned int num;
1489
Johannes Bergbdcbd8e2012-06-22 11:29:50 +02001490 sdata_info(sdata, "Trigger new scan to find an IBSS to join\n");
Johannes Berg46900292009-02-15 12:44:28 +01001491
Simon Wunderlich7ca15a02013-07-08 16:55:56 +02001492 scan_width = cfg80211_chandef_to_scan_width(&ifibss->chandef);
Sara Sharond321cd02016-01-25 15:46:35 +02001493
1494 if (ifibss->fixed_channel) {
1495 num = ieee80211_ibss_setup_scan_channels(local->hw.wiphy,
1496 &ifibss->chandef,
1497 channels,
1498 ARRAY_SIZE(channels));
1499 ieee80211_request_ibss_scan(sdata, ifibss->ssid,
1500 ifibss->ssid_len, channels,
1501 num, scan_width);
1502 } else {
1503 ieee80211_request_ibss_scan(sdata, ifibss->ssid,
1504 ifibss->ssid_len, NULL,
1505 0, scan_width);
1506 }
Benoit Papillaultce9058a2010-01-17 22:45:23 +01001507 } else {
Johannes Berg46900292009-02-15 12:44:28 +01001508 int interval = IEEE80211_SCAN_INTERVAL;
1509
1510 if (time_after(jiffies, ifibss->ibss_join_req +
Johannes Berg55de9082012-07-26 17:24:39 +02001511 IEEE80211_IBSS_JOIN_TIMEOUT))
1512 ieee80211_sta_create_ibss(sdata);
Johannes Berg46900292009-02-15 12:44:28 +01001513
Johannes Bergaf8cdcd2009-04-19 21:25:43 +02001514 mod_timer(&ifibss->timer,
1515 round_jiffies(jiffies + interval));
Johannes Berg46900292009-02-15 12:44:28 +01001516 }
Johannes Berg46900292009-02-15 12:44:28 +01001517}
1518
1519static void ieee80211_rx_mgmt_probe_req(struct ieee80211_sub_if_data *sdata,
Johannes Bergc269a2032011-02-14 12:20:22 +01001520 struct sk_buff *req)
Johannes Berg46900292009-02-15 12:44:28 +01001521{
Johannes Bergc269a2032011-02-14 12:20:22 +01001522 struct ieee80211_mgmt *mgmt = (void *)req->data;
Johannes Berg46900292009-02-15 12:44:28 +01001523 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1524 struct ieee80211_local *local = sdata->local;
Johannes Bergc269a2032011-02-14 12:20:22 +01001525 int tx_last_beacon, len = req->len;
Johannes Berg46900292009-02-15 12:44:28 +01001526 struct sk_buff *skb;
Johannes Bergc3ffeab2013-03-07 20:54:29 +01001527 struct beacon_data *presp;
Johannes Berg46900292009-02-15 12:44:28 +01001528 u8 *pos, *end;
1529
Johannes Berg8d61ffa2013-05-10 12:32:47 +02001530 sdata_assert_lock(sdata);
Johannes Berg7a17a332010-07-21 11:30:27 +02001531
Johannes Berg40b275b2011-05-13 14:15:49 +02001532 presp = rcu_dereference_protected(ifibss->presp,
Johannes Berg8d61ffa2013-05-10 12:32:47 +02001533 lockdep_is_held(&sdata->wdev.mtx));
Johannes Berg40b275b2011-05-13 14:15:49 +02001534
Johannes Berg46900292009-02-15 12:44:28 +01001535 if (ifibss->state != IEEE80211_IBSS_MLME_JOINED ||
Johannes Berg40b275b2011-05-13 14:15:49 +02001536 len < 24 + 2 || !presp)
Johannes Berg46900292009-02-15 12:44:28 +01001537 return;
1538
Johannes Berg24487982009-04-23 18:52:52 +02001539 tx_last_beacon = drv_tx_last_beacon(local);
Johannes Berg46900292009-02-15 12:44:28 +01001540
Emmanuel Grumbachc6e57b32018-08-31 11:31:13 +03001541 ibss_dbg(sdata, "RX ProbeReq SA=%pM DA=%pM\n", mgmt->sa, mgmt->da);
1542 ibss_dbg(sdata, "\tBSSID=%pM (tx_last_beacon=%d)\n",
1543 mgmt->bssid, tx_last_beacon);
Johannes Berg46900292009-02-15 12:44:28 +01001544
Felix Fietkau1ed76482011-03-24 19:46:18 +01001545 if (!tx_last_beacon && is_multicast_ether_addr(mgmt->da))
Johannes Berg46900292009-02-15 12:44:28 +01001546 return;
1547
Joe Perchesb203ca32012-05-08 18:56:52 +00001548 if (!ether_addr_equal(mgmt->bssid, ifibss->bssid) &&
Felix Fietkau888d04d2012-03-01 15:22:09 +01001549 !is_broadcast_ether_addr(mgmt->bssid))
Johannes Berg46900292009-02-15 12:44:28 +01001550 return;
1551
1552 end = ((u8 *) mgmt) + len;
1553 pos = mgmt->u.probe_req.variable;
1554 if (pos[0] != WLAN_EID_SSID ||
1555 pos + 2 + pos[1] > end) {
Johannes Bergbdcbd8e2012-06-22 11:29:50 +02001556 ibss_dbg(sdata, "Invalid SSID IE in ProbeReq from %pM\n",
1557 mgmt->sa);
Johannes Berg46900292009-02-15 12:44:28 +01001558 return;
1559 }
1560 if (pos[1] != 0 &&
1561 (pos[1] != ifibss->ssid_len ||
Benoit Papillault0da780c2010-02-05 01:21:03 +01001562 memcmp(pos + 2, ifibss->ssid, ifibss->ssid_len))) {
Johannes Berg46900292009-02-15 12:44:28 +01001563 /* Ignore ProbeReq for foreign SSID */
1564 return;
1565 }
1566
1567 /* Reply with ProbeResp */
Johannes Bergc3ffeab2013-03-07 20:54:29 +01001568 skb = dev_alloc_skb(local->tx_headroom + presp->head_len);
Johannes Berg46900292009-02-15 12:44:28 +01001569 if (!skb)
1570 return;
1571
Johannes Bergc3ffeab2013-03-07 20:54:29 +01001572 skb_reserve(skb, local->tx_headroom);
Johannes Berg59ae1d12017-06-16 14:29:20 +02001573 skb_put_data(skb, presp->head, presp->head_len);
Johannes Bergc3ffeab2013-03-07 20:54:29 +01001574
1575 memcpy(((struct ieee80211_mgmt *) skb->data)->da, mgmt->sa, ETH_ALEN);
1576 ibss_dbg(sdata, "Sending ProbeResp to %pM\n", mgmt->sa);
Johannes Berg62ae67b2009-11-18 18:42:05 +01001577 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
Simon Wunderlich691eb612014-01-24 23:48:29 +01001578
1579 /* avoid excessive retries for probe request to wildcard SSIDs */
1580 if (pos[1] == 0)
1581 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_CTL_NO_ACK;
1582
Johannes Berg62ae67b2009-11-18 18:42:05 +01001583 ieee80211_tx_skb(sdata, skb);
Johannes Berg46900292009-02-15 12:44:28 +01001584}
1585
Emmanuel Grumbachd45c4172012-12-10 16:19:13 +02001586static
1587void ieee80211_rx_mgmt_probe_beacon(struct ieee80211_sub_if_data *sdata,
1588 struct ieee80211_mgmt *mgmt, size_t len,
1589 struct ieee80211_rx_status *rx_status)
Johannes Berg46900292009-02-15 12:44:28 +01001590{
1591 size_t baselen;
Johannes Berg5d248282021-09-20 15:40:10 +02001592 struct ieee802_11_elems *elems;
Johannes Berg46900292009-02-15 12:44:28 +01001593
Emmanuel Grumbachd45c4172012-12-10 16:19:13 +02001594 BUILD_BUG_ON(offsetof(typeof(mgmt->u.probe_resp), variable) !=
1595 offsetof(typeof(mgmt->u.beacon), variable));
1596
1597 /*
1598 * either beacon or probe_resp but the variable field is at the
1599 * same offset
1600 */
Johannes Berg46900292009-02-15 12:44:28 +01001601 baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt;
1602 if (baselen > len)
1603 return;
1604
Johannes Berg5d248282021-09-20 15:40:10 +02001605 elems = ieee802_11_parse_elems(mgmt->u.probe_resp.variable,
1606 len - baselen, false,
1607 mgmt->bssid, NULL);
Johannes Berg46900292009-02-15 12:44:28 +01001608
Johannes Berg5d248282021-09-20 15:40:10 +02001609 if (elems) {
1610 ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, elems);
1611 kfree(elems);
1612 }
Johannes Berg46900292009-02-15 12:44:28 +01001613}
1614
Johannes Berg1fa57d02010-06-10 10:21:32 +02001615void ieee80211_ibss_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata,
1616 struct sk_buff *skb)
Johannes Berg46900292009-02-15 12:44:28 +01001617{
1618 struct ieee80211_rx_status *rx_status;
1619 struct ieee80211_mgmt *mgmt;
1620 u16 fc;
Johannes Berg5d248282021-09-20 15:40:10 +02001621 struct ieee802_11_elems *elems;
Simon Wunderlichcd7760e2013-08-28 13:41:31 +02001622 int ies_len;
Johannes Berg46900292009-02-15 12:44:28 +01001623
Johannes Bergf1d58c22009-06-17 13:13:00 +02001624 rx_status = IEEE80211_SKB_RXCB(skb);
Johannes Berg46900292009-02-15 12:44:28 +01001625 mgmt = (struct ieee80211_mgmt *) skb->data;
1626 fc = le16_to_cpu(mgmt->frame_control);
1627
Johannes Berg8d61ffa2013-05-10 12:32:47 +02001628 sdata_lock(sdata);
Johannes Berg7a17a332010-07-21 11:30:27 +02001629
Tim Harveyc926d002010-12-09 10:43:13 -08001630 if (!sdata->u.ibss.ssid_len)
1631 goto mgmt_out; /* not ready to merge yet */
1632
Johannes Berg46900292009-02-15 12:44:28 +01001633 switch (fc & IEEE80211_FCTL_STYPE) {
1634 case IEEE80211_STYPE_PROBE_REQ:
Johannes Bergc269a2032011-02-14 12:20:22 +01001635 ieee80211_rx_mgmt_probe_req(sdata, skb);
Johannes Berg46900292009-02-15 12:44:28 +01001636 break;
1637 case IEEE80211_STYPE_PROBE_RESP:
Johannes Berg46900292009-02-15 12:44:28 +01001638 case IEEE80211_STYPE_BEACON:
Emmanuel Grumbachd45c4172012-12-10 16:19:13 +02001639 ieee80211_rx_mgmt_probe_beacon(sdata, mgmt, skb->len,
1640 rx_status);
Johannes Berg46900292009-02-15 12:44:28 +01001641 break;
1642 case IEEE80211_STYPE_AUTH:
1643 ieee80211_rx_mgmt_auth_ibss(sdata, mgmt, skb->len);
1644 break;
Antonio Quartulli2cc59e72012-09-07 13:28:53 +02001645 case IEEE80211_STYPE_DEAUTH:
1646 ieee80211_rx_mgmt_deauth_ibss(sdata, mgmt, skb->len);
1647 break;
Simon Wunderlichcd7760e2013-08-28 13:41:31 +02001648 case IEEE80211_STYPE_ACTION:
1649 switch (mgmt->u.action.category) {
1650 case WLAN_CATEGORY_SPECTRUM_MGMT:
1651 ies_len = skb->len -
1652 offsetof(struct ieee80211_mgmt,
1653 u.action.u.chan_switch.variable);
1654
1655 if (ies_len < 0)
1656 break;
1657
Johannes Berg5d248282021-09-20 15:40:10 +02001658 elems = ieee802_11_parse_elems(
Simon Wunderlichcd7760e2013-08-28 13:41:31 +02001659 mgmt->u.action.u.chan_switch.variable,
Johannes Berg5d248282021-09-20 15:40:10 +02001660 ies_len, true, mgmt->bssid, NULL);
Simon Wunderlichcd7760e2013-08-28 13:41:31 +02001661
Johannes Berg8223ac12021-10-01 21:11:08 +02001662 if (elems && !elems->parse_error)
1663 ieee80211_rx_mgmt_spectrum_mgmt(sdata, mgmt,
1664 skb->len,
1665 rx_status,
1666 elems);
Johannes Berg5d248282021-09-20 15:40:10 +02001667 kfree(elems);
Simon Wunderlichcd7760e2013-08-28 13:41:31 +02001668 break;
1669 }
Johannes Berg46900292009-02-15 12:44:28 +01001670 }
Johannes Berg7a17a332010-07-21 11:30:27 +02001671
Tim Harveyc926d002010-12-09 10:43:13 -08001672 mgmt_out:
Johannes Berg8d61ffa2013-05-10 12:32:47 +02001673 sdata_unlock(sdata);
Johannes Berg46900292009-02-15 12:44:28 +01001674}
1675
Johannes Berg1fa57d02010-06-10 10:21:32 +02001676void ieee80211_ibss_work(struct ieee80211_sub_if_data *sdata)
Johannes Berg46900292009-02-15 12:44:28 +01001677{
Johannes Berg1fa57d02010-06-10 10:21:32 +02001678 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
Johannes Berg8bf11d82011-12-15 11:17:37 +01001679 struct sta_info *sta;
Johannes Berg46900292009-02-15 12:44:28 +01001680
Johannes Berg8d61ffa2013-05-10 12:32:47 +02001681 sdata_lock(sdata);
Johannes Berg7a17a332010-07-21 11:30:27 +02001682
1683 /*
1684 * Work could be scheduled after scan or similar
1685 * when we aren't even joined (or trying) with a
1686 * network.
1687 */
1688 if (!ifibss->ssid_len)
1689 goto out;
Johannes Berg46900292009-02-15 12:44:28 +01001690
Johannes Berg8bf11d82011-12-15 11:17:37 +01001691 spin_lock_bh(&ifibss->incomplete_lock);
1692 while (!list_empty(&ifibss->incomplete_stations)) {
1693 sta = list_first_entry(&ifibss->incomplete_stations,
1694 struct sta_info, list);
1695 list_del(&sta->list);
1696 spin_unlock_bh(&ifibss->incomplete_lock);
1697
Antonio Quartulli52874a52013-06-18 14:20:40 +02001698 ieee80211_ibss_finish_sta(sta);
Johannes Berg8bf11d82011-12-15 11:17:37 +01001699 rcu_read_unlock();
1700 spin_lock_bh(&ifibss->incomplete_lock);
1701 }
1702 spin_unlock_bh(&ifibss->incomplete_lock);
1703
Johannes Berg46900292009-02-15 12:44:28 +01001704 switch (ifibss->state) {
1705 case IEEE80211_IBSS_MLME_SEARCH:
1706 ieee80211_sta_find_ibss(sdata);
1707 break;
1708 case IEEE80211_IBSS_MLME_JOINED:
1709 ieee80211_sta_merge_ibss(sdata);
1710 break;
1711 default:
1712 WARN_ON(1);
1713 break;
1714 }
Johannes Berg46900292009-02-15 12:44:28 +01001715
Johannes Berg7a17a332010-07-21 11:30:27 +02001716 out:
Johannes Berg8d61ffa2013-05-10 12:32:47 +02001717 sdata_unlock(sdata);
Johannes Berg3a4d4aa2010-05-26 16:41:40 +02001718}
1719
Kees Cook34f11cd32017-10-16 16:35:49 -07001720static void ieee80211_ibss_timer(struct timer_list *t)
Johannes Berg46900292009-02-15 12:44:28 +01001721{
1722 struct ieee80211_sub_if_data *sdata =
Kees Cook34f11cd32017-10-16 16:35:49 -07001723 from_timer(sdata, t, u.ibss.timer);
Johannes Berg46900292009-02-15 12:44:28 +01001724
Stanislaw Gruszkaa6182942013-02-28 10:55:28 +01001725 ieee80211_queue_work(&sdata->local->hw, &sdata->work);
Johannes Berg46900292009-02-15 12:44:28 +01001726}
1727
1728void ieee80211_ibss_setup_sdata(struct ieee80211_sub_if_data *sdata)
1729{
1730 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1731
Kees Cook34f11cd32017-10-16 16:35:49 -07001732 timer_setup(&ifibss->timer, ieee80211_ibss_timer, 0);
Johannes Berg8bf11d82011-12-15 11:17:37 +01001733 INIT_LIST_HEAD(&ifibss->incomplete_stations);
1734 spin_lock_init(&ifibss->incomplete_lock);
Simon Wunderlichcd7760e2013-08-28 13:41:31 +02001735 INIT_WORK(&ifibss->csa_connection_drop_work,
1736 ieee80211_csa_connection_drop_work);
Johannes Berg46900292009-02-15 12:44:28 +01001737}
1738
1739/* scan finished notification */
1740void ieee80211_ibss_notify_scan_completed(struct ieee80211_local *local)
1741{
Johannes Bergaf8cdcd2009-04-19 21:25:43 +02001742 struct ieee80211_sub_if_data *sdata;
Johannes Berg46900292009-02-15 12:44:28 +01001743
Johannes Berg29b4a4f2009-04-21 00:30:49 +02001744 mutex_lock(&local->iflist_mtx);
1745 list_for_each_entry(sdata, &local->interfaces, list) {
Johannes Berg9607e6b662009-12-23 13:15:31 +01001746 if (!ieee80211_sdata_running(sdata))
Johannes Berg0e41f712009-04-23 11:48:56 +02001747 continue;
Johannes Bergaf8cdcd2009-04-19 21:25:43 +02001748 if (sdata->vif.type != NL80211_IFTYPE_ADHOC)
1749 continue;
1750 sdata->u.ibss.last_scan_completed = jiffies;
Johannes Berg46900292009-02-15 12:44:28 +01001751 }
Johannes Berg29b4a4f2009-04-21 00:30:49 +02001752 mutex_unlock(&local->iflist_mtx);
Johannes Berg46900292009-02-15 12:44:28 +01001753}
1754
Johannes Bergaf8cdcd2009-04-19 21:25:43 +02001755int ieee80211_ibss_join(struct ieee80211_sub_if_data *sdata,
1756 struct cfg80211_ibss_params *params)
1757{
Simon Wunderlichff3cc5f2011-11-30 16:56:33 +01001758 u32 changed = 0;
Simon Wunderlich2103dec2013-07-08 16:55:53 +02001759 u32 rate_flags;
1760 struct ieee80211_supported_band *sband;
Luciano Coelho71965c12014-02-18 17:07:53 +02001761 enum ieee80211_chanctx_mode chanmode;
1762 struct ieee80211_local *local = sdata->local;
1763 int radar_detect_width = 0;
Simon Wunderlich2103dec2013-07-08 16:55:53 +02001764 int i;
Luciano Coelho71965c12014-02-18 17:07:53 +02001765 int ret;
1766
Thomas Pedersenb60119602020-04-01 18:18:04 -07001767 if (params->chandef.chan->freq_offset) {
1768 /* this may work, but is untested */
1769 return -EOPNOTSUPP;
1770 }
1771
Luciano Coelho71965c12014-02-18 17:07:53 +02001772 ret = cfg80211_chandef_dfs_required(local->hw.wiphy,
1773 &params->chandef,
1774 sdata->wdev.iftype);
1775 if (ret < 0)
1776 return ret;
1777
1778 if (ret > 0) {
1779 if (!params->userspace_handles_dfs)
1780 return -EINVAL;
1781 radar_detect_width = BIT(params->chandef.width);
1782 }
1783
1784 chanmode = (params->channel_fixed && !ret) ?
1785 IEEE80211_CHANCTX_SHARED : IEEE80211_CHANCTX_EXCLUSIVE;
1786
1787 mutex_lock(&local->chanctx_mtx);
1788 ret = ieee80211_check_combinations(sdata, &params->chandef, chanmode,
1789 radar_detect_width);
1790 mutex_unlock(&local->chanctx_mtx);
1791 if (ret < 0)
1792 return ret;
Johannes Bergaf8cdcd2009-04-19 21:25:43 +02001793
Johannes Bergaf8cdcd2009-04-19 21:25:43 +02001794 if (params->bssid) {
1795 memcpy(sdata->u.ibss.bssid, params->bssid, ETH_ALEN);
1796 sdata->u.ibss.fixed_bssid = true;
1797 } else
1798 sdata->u.ibss.fixed_bssid = false;
1799
Johannes Bergfffd0932009-07-08 14:22:54 +02001800 sdata->u.ibss.privacy = params->privacy;
Antonio Quartulli267335d2012-01-31 20:25:47 +01001801 sdata->u.ibss.control_port = params->control_port;
Simon Wunderlich8e8d3472013-10-07 18:41:06 +02001802 sdata->u.ibss.userspace_handles_dfs = params->userspace_handles_dfs;
Teemu Paasikivifbd2c8d2010-06-14 12:55:31 +03001803 sdata->u.ibss.basic_rates = params->basic_rates;
Krzysztof HaƂasac7d37a62014-05-26 14:14:46 +02001804 sdata->u.ibss.last_scan_completed = jiffies;
Simon Wunderlich2103dec2013-07-08 16:55:53 +02001805
1806 /* fix basic_rates if channel does not support these rates */
1807 rate_flags = ieee80211_chandef_rate_flags(&params->chandef);
Luciano Coelho71965c12014-02-18 17:07:53 +02001808 sband = local->hw.wiphy->bands[params->chandef.chan->band];
Simon Wunderlich2103dec2013-07-08 16:55:53 +02001809 for (i = 0; i < sband->n_bitrates; i++) {
1810 if ((rate_flags & sband->bitrates[i].flags) != rate_flags)
1811 sdata->u.ibss.basic_rates &= ~BIT(i);
1812 }
Felix Fietkaudd5b4cc2010-11-22 20:58:24 +01001813 memcpy(sdata->vif.bss_conf.mcast_rate, params->mcast_rate,
1814 sizeof(params->mcast_rate));
Johannes Bergfffd0932009-07-08 14:22:54 +02001815
Johannes Berg57c4d7b2009-04-23 16:10:04 +02001816 sdata->vif.bss_conf.beacon_int = params->beacon_interval;
1817
Simon Wunderlich3aede782013-05-16 13:00:36 +02001818 sdata->u.ibss.chandef = params->chandef;
Johannes Bergaf8cdcd2009-04-19 21:25:43 +02001819 sdata->u.ibss.fixed_channel = params->channel_fixed;
1820
1821 if (params->ie) {
1822 sdata->u.ibss.ie = kmemdup(params->ie, params->ie_len,
1823 GFP_KERNEL);
1824 if (sdata->u.ibss.ie)
1825 sdata->u.ibss.ie_len = params->ie_len;
1826 }
1827
Johannes Bergaf8cdcd2009-04-19 21:25:43 +02001828 sdata->u.ibss.state = IEEE80211_IBSS_MLME_SEARCH;
1829 sdata->u.ibss.ibss_join_req = jiffies;
1830
Antonio Quartullibadecb02012-10-26 18:54:25 +02001831 memcpy(sdata->u.ibss.ssid, params->ssid, params->ssid_len);
Johannes Berg0e41f712009-04-23 11:48:56 +02001832 sdata->u.ibss.ssid_len = params->ssid_len;
1833
Simon Wunderlich822854b2013-06-28 10:39:59 +02001834 memcpy(&sdata->u.ibss.ht_capa, &params->ht_capa,
1835 sizeof(sdata->u.ibss.ht_capa));
1836 memcpy(&sdata->u.ibss.ht_capa_mask, &params->ht_capa_mask,
1837 sizeof(sdata->u.ibss.ht_capa_mask));
1838
Simon Wunderlichff3cc5f2011-11-30 16:56:33 +01001839 /*
1840 * 802.11n-2009 9.13.3.1: In an IBSS, the HT Protection field is
1841 * reserved, but an HT STA shall protect HT transmissions as though
1842 * the HT Protection field were set to non-HT mixed mode.
1843 *
1844 * In an IBSS, the RIFS Mode field of the HT Operation element is
1845 * also reserved, but an HT STA shall operate as though this field
1846 * were set to 1.
1847 */
1848
1849 sdata->vif.bss_conf.ht_operation_mode |=
1850 IEEE80211_HT_OP_MODE_PROTECTION_NONHT_MIXED
1851 | IEEE80211_HT_PARAM_RIFS_MODE;
1852
Pradeep Kumar Chitrapudcbe73c2018-03-22 12:18:03 -07001853 changed |= BSS_CHANGED_HT | BSS_CHANGED_MCAST_RATE;
Simon Wunderlichff3cc5f2011-11-30 16:56:33 +01001854 ieee80211_bss_info_change_notify(sdata, changed);
1855
Johannes Berg04ecd252012-09-11 14:34:12 +02001856 sdata->smps_mode = IEEE80211_SMPS_OFF;
Luciano Coelho71965c12014-02-18 17:07:53 +02001857 sdata->needed_rx_chains = local->rx_chains;
Denis Kenzior018f6fb2018-03-26 12:52:51 -05001858 sdata->control_port_over_nl80211 = params->control_port_over_nl80211;
Johannes Berg04ecd252012-09-11 14:34:12 +02001859
Luciano Coelho71965c12014-02-18 17:07:53 +02001860 ieee80211_queue_work(&local->hw, &sdata->work);
Johannes Bergaf8cdcd2009-04-19 21:25:43 +02001861
1862 return 0;
1863}
1864
1865int ieee80211_ibss_leave(struct ieee80211_sub_if_data *sdata)
1866{
Teemu Paasikivi5ea096c2010-06-14 12:55:33 +03001867 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
Johannes Berg7a17a332010-07-21 11:30:27 +02001868
Simon Wunderlich871a4182013-08-28 13:41:30 +02001869 ieee80211_ibss_disconnect(sdata);
Simon Wunderlichb78a4932012-11-13 18:43:03 +01001870 ifibss->ssid_len = 0;
Joe Perchesc84a67a2015-03-02 19:54:57 -08001871 eth_zero_addr(ifibss->bssid);
Johannes Bergaf8cdcd2009-04-19 21:25:43 +02001872
1873 /* remove beacon */
1874 kfree(sdata->u.ibss.ie);
Markus Theil3bd801b2021-02-13 14:36:53 +01001875 sdata->u.ibss.ie = NULL;
1876 sdata->u.ibss.ie_len = 0;
Simon Wunderlich822854b2013-06-28 10:39:59 +02001877
1878 /* on the next join, re-program HT parameters */
1879 memset(&ifibss->ht_capa, 0, sizeof(ifibss->ht_capa));
1880 memset(&ifibss->ht_capa_mask, 0, sizeof(ifibss->ht_capa_mask));
1881
Johannes Bergaf8cdcd2009-04-19 21:25:43 +02001882 synchronize_rcu();
Johannes Bergaf8cdcd2009-04-19 21:25:43 +02001883
Johannes Berg35f20c12010-06-10 10:21:30 +02001884 skb_queue_purge(&sdata->skb_queue);
Johannes Berg5cff20e2009-04-29 12:26:17 +02001885
Johannes Bergbc05d192010-07-21 10:52:40 +02001886 del_timer_sync(&sdata->u.ibss.timer);
Johannes Berg7a17a332010-07-21 11:30:27 +02001887
Johannes Bergaf8cdcd2009-04-19 21:25:43 +02001888 return 0;
1889}