blob: 978d3bc31df727468602a7b234d10b5b1e9ba35c [file] [log] [blame]
Johannes Berg46900292009-02-15 12:44:28 +01001/*
2 * IBSS mode implementation
3 * Copyright 2003-2008, Jouni Malinen <j@w1.fi>
4 * Copyright 2004, Instant802 Networks, Inc.
5 * Copyright 2005, Devicescape Software, Inc.
6 * Copyright 2006-2007 Jiri Benc <jbenc@suse.cz>
7 * Copyright 2007, Michael Wu <flamingice@sourmilk.net>
8 * Copyright 2009, Johannes Berg <johannes@sipsolutions.net>
Johannes Bergd98ad832014-09-03 15:24:57 +03009 * Copyright 2013-2014 Intel Mobile Communications GmbH
Johannes Berg46900292009-02-15 12:44:28 +010010 *
11 * This program is free software; you can redistribute it and/or modify
12 * it under the terms of the GNU General Public License version 2 as
13 * published by the Free Software Foundation.
14 */
15
16#include <linux/delay.h>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090017#include <linux/slab.h>
Johannes Berg46900292009-02-15 12:44:28 +010018#include <linux/if_ether.h>
19#include <linux/skbuff.h>
20#include <linux/if_arp.h>
21#include <linux/etherdevice.h>
22#include <linux/rtnetlink.h>
23#include <net/mac80211.h>
Johannes Berg46900292009-02-15 12:44:28 +010024
25#include "ieee80211_i.h"
Johannes Berg24487982009-04-23 18:52:52 +020026#include "driver-ops.h"
Johannes Berg46900292009-02-15 12:44:28 +010027#include "rate.h"
28
29#define IEEE80211_SCAN_INTERVAL (2 * HZ)
Johannes Berg46900292009-02-15 12:44:28 +010030#define IEEE80211_IBSS_JOIN_TIMEOUT (7 * HZ)
31
32#define IEEE80211_IBSS_MERGE_INTERVAL (30 * HZ)
33#define IEEE80211_IBSS_INACTIVITY_LIMIT (60 * HZ)
Antonio Quartullidad9def2013-07-26 21:15:02 +020034#define IEEE80211_IBSS_RSN_INACTIVITY_LIMIT (10 * HZ)
Johannes Berg46900292009-02-15 12:44:28 +010035
36#define IEEE80211_IBSS_MAX_STA_ENTRIES 128
37
Simon Wunderlichd51b70f2013-08-09 16:35:17 +020038static struct beacon_data *
39ieee80211_ibss_build_presp(struct ieee80211_sub_if_data *sdata,
40 const int beacon_int, const u32 basic_rates,
41 const u16 capability, u64 tsf,
42 struct cfg80211_chan_def *chandef,
Simon Wunderlichcd7760e2013-08-28 13:41:31 +020043 bool *have_higher_than_11mbit,
44 struct cfg80211_csa_settings *csa_settings)
Simon Wunderlichd51b70f2013-08-09 16:35:17 +020045{
46 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
47 struct ieee80211_local *local = sdata->local;
48 int rates_n = 0, i, ri;
49 struct ieee80211_mgmt *mgmt;
50 u8 *pos;
51 struct ieee80211_supported_band *sband;
52 u32 rate_flags, rates = 0, rates_added = 0;
53 struct beacon_data *presp;
54 int frame_len;
55 int shift;
56
57 /* Build IBSS probe response */
58 frame_len = sizeof(struct ieee80211_hdr_3addr) +
59 12 /* struct ieee80211_mgmt.u.beacon */ +
60 2 + IEEE80211_MAX_SSID_LEN /* max SSID */ +
61 2 + 8 /* max Supported Rates */ +
62 3 /* max DS params */ +
63 4 /* IBSS params */ +
Simon Wunderlichcd7760e2013-08-28 13:41:31 +020064 5 /* Channel Switch Announcement */ +
Simon Wunderlichd51b70f2013-08-09 16:35:17 +020065 2 + (IEEE80211_MAX_SUPP_RATES - 8) +
66 2 + sizeof(struct ieee80211_ht_cap) +
67 2 + sizeof(struct ieee80211_ht_operation) +
68 ifibss->ie_len;
69 presp = kzalloc(sizeof(*presp) + frame_len, GFP_KERNEL);
70 if (!presp)
71 return NULL;
72
73 presp->head = (void *)(presp + 1);
74
75 mgmt = (void *) presp->head;
76 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
77 IEEE80211_STYPE_PROBE_RESP);
78 eth_broadcast_addr(mgmt->da);
79 memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
80 memcpy(mgmt->bssid, ifibss->bssid, ETH_ALEN);
81 mgmt->u.beacon.beacon_int = cpu_to_le16(beacon_int);
82 mgmt->u.beacon.timestamp = cpu_to_le64(tsf);
83 mgmt->u.beacon.capab_info = cpu_to_le16(capability);
84
85 pos = (u8 *)mgmt + offsetof(struct ieee80211_mgmt, u.beacon.variable);
86
87 *pos++ = WLAN_EID_SSID;
88 *pos++ = ifibss->ssid_len;
89 memcpy(pos, ifibss->ssid, ifibss->ssid_len);
90 pos += ifibss->ssid_len;
91
92 sband = local->hw.wiphy->bands[chandef->chan->band];
93 rate_flags = ieee80211_chandef_rate_flags(chandef);
94 shift = ieee80211_chandef_get_shift(chandef);
95 rates_n = 0;
96 if (have_higher_than_11mbit)
97 *have_higher_than_11mbit = false;
98
99 for (i = 0; i < sband->n_bitrates; i++) {
100 if ((rate_flags & sband->bitrates[i].flags) != rate_flags)
101 continue;
102 if (sband->bitrates[i].bitrate > 110 &&
103 have_higher_than_11mbit)
104 *have_higher_than_11mbit = true;
105
106 rates |= BIT(i);
107 rates_n++;
108 }
109
110 *pos++ = WLAN_EID_SUPP_RATES;
111 *pos++ = min_t(int, 8, rates_n);
112 for (ri = 0; ri < sband->n_bitrates; ri++) {
113 int rate = DIV_ROUND_UP(sband->bitrates[ri].bitrate,
114 5 * (1 << shift));
115 u8 basic = 0;
116 if (!(rates & BIT(ri)))
117 continue;
118
119 if (basic_rates & BIT(ri))
120 basic = 0x80;
121 *pos++ = basic | (u8) rate;
122 if (++rates_added == 8) {
123 ri++; /* continue at next rate for EXT_SUPP_RATES */
124 break;
125 }
126 }
127
128 if (sband->band == IEEE80211_BAND_2GHZ) {
129 *pos++ = WLAN_EID_DS_PARAMS;
130 *pos++ = 1;
131 *pos++ = ieee80211_frequency_to_channel(
132 chandef->chan->center_freq);
133 }
134
135 *pos++ = WLAN_EID_IBSS_PARAMS;
136 *pos++ = 2;
137 /* FIX: set ATIM window based on scan results */
138 *pos++ = 0;
139 *pos++ = 0;
140
Simon Wunderlichcd7760e2013-08-28 13:41:31 +0200141 if (csa_settings) {
142 *pos++ = WLAN_EID_CHANNEL_SWITCH;
143 *pos++ = 3;
144 *pos++ = csa_settings->block_tx ? 1 : 0;
145 *pos++ = ieee80211_frequency_to_channel(
146 csa_settings->chandef.chan->center_freq);
Michal Kazioraf296bd2014-06-05 14:21:36 +0200147 presp->csa_counter_offsets[0] = (pos - presp->head);
Simon Wunderlichcd7760e2013-08-28 13:41:31 +0200148 *pos++ = csa_settings->count;
Chun-Yeow Yeoh8df734e2015-06-09 13:35:33 +0800149 presp->csa_current_counter = csa_settings->count;
Simon Wunderlichcd7760e2013-08-28 13:41:31 +0200150 }
151
Simon Wunderlichd51b70f2013-08-09 16:35:17 +0200152 /* put the remaining rates in WLAN_EID_EXT_SUPP_RATES */
153 if (rates_n > 8) {
154 *pos++ = WLAN_EID_EXT_SUPP_RATES;
155 *pos++ = rates_n - 8;
156 for (; ri < sband->n_bitrates; ri++) {
157 int rate = DIV_ROUND_UP(sband->bitrates[ri].bitrate,
158 5 * (1 << shift));
159 u8 basic = 0;
160 if (!(rates & BIT(ri)))
161 continue;
162
163 if (basic_rates & BIT(ri))
164 basic = 0x80;
165 *pos++ = basic | (u8) rate;
166 }
167 }
168
169 if (ifibss->ie_len) {
170 memcpy(pos, ifibss->ie, ifibss->ie_len);
171 pos += ifibss->ie_len;
172 }
173
174 /* add HT capability and information IEs */
175 if (chandef->width != NL80211_CHAN_WIDTH_20_NOHT &&
176 chandef->width != NL80211_CHAN_WIDTH_5 &&
177 chandef->width != NL80211_CHAN_WIDTH_10 &&
178 sband->ht_cap.ht_supported) {
179 struct ieee80211_sta_ht_cap ht_cap;
180
181 memcpy(&ht_cap, &sband->ht_cap, sizeof(ht_cap));
182 ieee80211_apply_htcap_overrides(sdata, &ht_cap);
183
184 pos = ieee80211_ie_build_ht_cap(pos, &ht_cap, ht_cap.cap);
185 /*
186 * Note: According to 802.11n-2009 9.13.3.1, HT Protection
187 * field and RIFS Mode are reserved in IBSS mode, therefore
188 * keep them at 0
189 */
190 pos = ieee80211_ie_build_ht_oper(pos, &sband->ht_cap,
Arik Nemtsov57f255f2015-10-25 10:59:34 +0200191 chandef, 0, false);
Janusz.Dziedzic@tieto.comabcff6e2015-03-20 06:37:01 +0100192
193 /* add VHT capability and information IEs */
194 if (chandef->width != NL80211_CHAN_WIDTH_20 &&
195 chandef->width != NL80211_CHAN_WIDTH_40 &&
196 sband->vht_cap.vht_supported) {
197 pos = ieee80211_ie_build_vht_cap(pos, &sband->vht_cap,
198 sband->vht_cap.cap);
199 pos = ieee80211_ie_build_vht_oper(pos, &sband->vht_cap,
200 chandef);
201 }
Simon Wunderlichd51b70f2013-08-09 16:35:17 +0200202 }
203
Arik Nemtsov40b861a2014-07-17 17:14:23 +0300204 if (local->hw.queues >= IEEE80211_NUM_ACS)
205 pos = ieee80211_add_wmm_info_ie(pos, 0); /* U-APSD not in use */
Simon Wunderlichd51b70f2013-08-09 16:35:17 +0200206
207 presp->head_len = pos - presp->head;
208 if (WARN_ON(presp->head_len > frame_len))
209 goto error;
210
211 return presp;
212error:
213 kfree(presp);
214 return NULL;
215}
Johannes Berg46900292009-02-15 12:44:28 +0100216
Johannes Bergaf8cdcd2009-04-19 21:25:43 +0200217static void __ieee80211_sta_join_ibss(struct ieee80211_sub_if_data *sdata,
218 const u8 *bssid, const int beacon_int,
Simon Wunderlich75a423f2013-08-21 15:30:25 +0200219 struct cfg80211_chan_def *req_chandef,
Johannes Bergb59066a2009-05-12 21:18:38 +0200220 const u32 basic_rates,
Sujith Manoharanc13a7652012-10-12 17:35:45 +0530221 const u16 capability, u64 tsf,
222 bool creator)
Johannes Berg46900292009-02-15 12:44:28 +0100223{
224 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
225 struct ieee80211_local *local = sdata->local;
Simon Wunderlichd51b70f2013-08-09 16:35:17 +0200226 struct ieee80211_mgmt *mgmt;
Johannes Bergf446d102009-10-28 15:12:32 +0100227 struct cfg80211_bss *bss;
Simon Wunderlichd51b70f2013-08-09 16:35:17 +0200228 u32 bss_change;
Johannes Berg683b6d32012-11-08 21:25:48 +0100229 struct cfg80211_chan_def chandef;
Simon Wunderlich75a423f2013-08-21 15:30:25 +0200230 struct ieee80211_channel *chan;
Johannes Bergc3ffeab2013-03-07 20:54:29 +0100231 struct beacon_data *presp;
Johannes Berg61f6bba2015-10-13 11:36:21 +0200232 struct cfg80211_inform_bss bss_meta = {};
Simon Wunderlichd51b70f2013-08-09 16:35:17 +0200233 bool have_higher_than_11mbit;
Luciano Coelho2beb6dab2014-02-18 11:40:36 +0200234 bool radar_required;
Johannes Berg55fff502013-08-19 18:48:41 +0200235 int err;
Johannes Berg24487982009-04-23 18:52:52 +0200236
Johannes Berg8d61ffa2013-05-10 12:32:47 +0200237 sdata_assert_lock(sdata);
Johannes Berg7a17a332010-07-21 11:30:27 +0200238
Johannes Berg24487982009-04-23 18:52:52 +0200239 /* Reset own TSF to allow time synchronization work. */
Eliad Peller37a41b42011-09-21 14:06:11 +0300240 drv_reset_tsf(local, sdata);
Johannes Berg46900292009-02-15 12:44:28 +0100241
Joe Perchesb203ca32012-05-08 18:56:52 +0000242 if (!ether_addr_equal(ifibss->bssid, bssid))
Johannes Bergb998e8b2012-12-13 23:07:46 +0100243 sta_info_flush(sdata);
Johannes Berg46900292009-02-15 12:44:28 +0100244
Johannes Berg49b5c7f2010-04-29 21:34:01 +0200245 /* if merging, indicate to driver that we leave the old IBSS */
246 if (sdata->vif.bss_conf.ibss_joined) {
247 sdata->vif.bss_conf.ibss_joined = false;
Sujith Manoharanc13a7652012-10-12 17:35:45 +0530248 sdata->vif.bss_conf.ibss_creator = false;
Johannes Berg1852d402013-03-07 20:22:28 +0100249 sdata->vif.bss_conf.enable_beacon = false;
Eliad Peller86a2ea42011-11-08 15:36:59 +0200250 netif_carrier_off(sdata->dev);
Johannes Berg1852d402013-03-07 20:22:28 +0100251 ieee80211_bss_info_change_notify(sdata,
252 BSS_CHANGED_IBSS |
253 BSS_CHANGED_BEACON_ENABLED);
Johannes Berg55fff502013-08-19 18:48:41 +0200254 drv_leave_ibss(local, sdata);
Johannes Berg49b5c7f2010-04-29 21:34:01 +0200255 }
256
Johannes Bergc3ffeab2013-03-07 20:54:29 +0100257 presp = rcu_dereference_protected(ifibss->presp,
Johannes Berg8d61ffa2013-05-10 12:32:47 +0200258 lockdep_is_held(&sdata->wdev.mtx));
Monam Agarwal0c2bef462014-03-24 00:51:43 +0530259 RCU_INIT_POINTER(ifibss->presp, NULL);
Johannes Bergc3ffeab2013-03-07 20:54:29 +0100260 if (presp)
261 kfree_rcu(presp, rcu_head);
Johannes Berg1852d402013-03-07 20:22:28 +0100262
Simon Wunderlich75a423f2013-08-21 15:30:25 +0200263 /* make a copy of the chandef, it could be modified below. */
264 chandef = *req_chandef;
265 chan = chandef.chan;
Ilan Peer174e0cd2014-02-23 09:13:01 +0200266 if (!cfg80211_reg_can_beacon(local->hw.wiphy, &chandef,
267 NL80211_IFTYPE_ADHOC)) {
Simon Wunderlich4b42aab2013-07-08 16:55:57 +0200268 if (chandef.width == NL80211_CHAN_WIDTH_5 ||
269 chandef.width == NL80211_CHAN_WIDTH_10 ||
270 chandef.width == NL80211_CHAN_WIDTH_20_NOHT ||
271 chandef.width == NL80211_CHAN_WIDTH_20) {
272 sdata_info(sdata,
273 "Failed to join IBSS, beacons forbidden\n");
274 return;
275 }
Johannes Berg4bf88532012-11-09 11:39:59 +0100276 chandef.width = NL80211_CHAN_WIDTH_20;
277 chandef.center_freq1 = chan->center_freq;
Simon Wunderlich8e8d3472013-10-07 18:41:06 +0200278 /* check again for downgraded chandef */
Ilan Peer174e0cd2014-02-23 09:13:01 +0200279 if (!cfg80211_reg_can_beacon(local->hw.wiphy, &chandef,
280 NL80211_IFTYPE_ADHOC)) {
Simon Wunderlich8e8d3472013-10-07 18:41:06 +0200281 sdata_info(sdata,
282 "Failed to join IBSS, beacons forbidden\n");
283 return;
284 }
285 }
286
287 err = cfg80211_chandef_dfs_required(sdata->local->hw.wiphy,
Luciano Coelho2beb6dab2014-02-18 11:40:36 +0200288 &chandef, NL80211_IFTYPE_ADHOC);
Luciano Coelho6658ab82014-02-20 16:36:23 +0200289 if (err < 0) {
290 sdata_info(sdata,
291 "Failed to join IBSS, invalid chandef\n");
292 return;
293 }
Luciano Coelho2beb6dab2014-02-18 11:40:36 +0200294 if (err > 0 && !ifibss->userspace_handles_dfs) {
295 sdata_info(sdata,
296 "Failed to join IBSS, DFS channel without control program\n");
297 return;
Johannes Berg4bf88532012-11-09 11:39:59 +0100298 }
Johannes Berg55de9082012-07-26 17:24:39 +0200299
Luciano Coelho2beb6dab2014-02-18 11:40:36 +0200300 radar_required = err;
301
Johannes Berg34a37402013-12-18 09:43:33 +0100302 mutex_lock(&local->mtx);
Johannes Berg4bf88532012-11-09 11:39:59 +0100303 if (ieee80211_vif_use_channel(sdata, &chandef,
Johannes Berg55de9082012-07-26 17:24:39 +0200304 ifibss->fixed_channel ?
305 IEEE80211_CHANCTX_SHARED :
306 IEEE80211_CHANCTX_EXCLUSIVE)) {
307 sdata_info(sdata, "Failed to join IBSS, no channel context\n");
Johannes Berg34a37402013-12-18 09:43:33 +0100308 mutex_unlock(&local->mtx);
Johannes Berg55de9082012-07-26 17:24:39 +0200309 return;
Alexander Simon13c40c52011-11-30 16:56:34 +0100310 }
Michal Kaziorcc901de2014-01-29 07:56:20 +0100311 sdata->radar_required = radar_required;
Johannes Berg34a37402013-12-18 09:43:33 +0100312 mutex_unlock(&local->mtx);
Johannes Berg55de9082012-07-26 17:24:39 +0200313
314 memcpy(ifibss->bssid, bssid, ETH_ALEN);
Johannes Berg57c4d7b2009-04-23 16:10:04 +0200315
Simon Wunderlichd51b70f2013-08-09 16:35:17 +0200316 presp = ieee80211_ibss_build_presp(sdata, beacon_int, basic_rates,
317 capability, tsf, &chandef,
Simon Wunderlichcd7760e2013-08-28 13:41:31 +0200318 &have_higher_than_11mbit, NULL);
Johannes Bergc3ffeab2013-03-07 20:54:29 +0100319 if (!presp)
320 return;
321
Johannes Bergc3ffeab2013-03-07 20:54:29 +0100322 rcu_assign_pointer(ifibss->presp, presp);
Simon Wunderlichd51b70f2013-08-09 16:35:17 +0200323 mgmt = (void *)presp->head;
Johannes Berg46900292009-02-15 12:44:28 +0100324
Johannes Bergd6a83222012-12-14 14:06:28 +0100325 sdata->vif.bss_conf.enable_beacon = true;
Johannes Berg2d0ddec2009-04-23 16:13:26 +0200326 sdata->vif.bss_conf.beacon_int = beacon_int;
Teemu Paasikivifbd2c8d2010-06-14 12:55:31 +0300327 sdata->vif.bss_conf.basic_rates = basic_rates;
Marek Puzyniak0ca54f62013-04-10 13:19:13 +0200328 sdata->vif.bss_conf.ssid_len = ifibss->ssid_len;
329 memcpy(sdata->vif.bss_conf.ssid, ifibss->ssid, ifibss->ssid_len);
Johannes Berg2d0ddec2009-04-23 16:13:26 +0200330 bss_change = BSS_CHANGED_BEACON_INT;
331 bss_change |= ieee80211_reset_erp_info(sdata);
332 bss_change |= BSS_CHANGED_BSSID;
333 bss_change |= BSS_CHANGED_BEACON;
334 bss_change |= BSS_CHANGED_BEACON_ENABLED;
Teemu Paasikivi392cfdb2010-06-14 12:55:32 +0300335 bss_change |= BSS_CHANGED_BASIC_RATES;
Alexander Simon13c40c52011-11-30 16:56:34 +0100336 bss_change |= BSS_CHANGED_HT;
Johannes Berg8fc214b2010-04-28 17:40:43 +0200337 bss_change |= BSS_CHANGED_IBSS;
Marek Puzyniak0ca54f62013-04-10 13:19:13 +0200338 bss_change |= BSS_CHANGED_SSID;
Simon Wunderlich2f91a962012-12-03 22:21:30 +0100339
340 /*
341 * In 5 GHz/802.11a, we can always use short slot time.
342 * (IEEE 802.11-2012 18.3.8.7)
343 *
344 * In 2.4GHz, we must always use long slots in IBSS for compatibility
345 * reasons.
346 * (IEEE 802.11-2012 19.4.5)
347 *
348 * HT follows these specifications (IEEE 802.11-2012 20.3.18)
349 */
350 sdata->vif.bss_conf.use_short_slot = chan->band == IEEE80211_BAND_5GHZ;
351 bss_change |= BSS_CHANGED_ERP_SLOT;
352
Simon Wunderlich2ec9c1f2013-07-11 18:07:46 +0200353 /* cf. IEEE 802.11 9.2.12 */
354 if (chan->band == IEEE80211_BAND_2GHZ && have_higher_than_11mbit)
355 sdata->flags |= IEEE80211_SDATA_OPERATING_GMODE;
356 else
357 sdata->flags &= ~IEEE80211_SDATA_OPERATING_GMODE;
358
Johannes Bergcec66282015-10-22 17:46:04 +0200359 ieee80211_set_wmm_default(sdata, true, false);
Johannes Berg55fff502013-08-19 18:48:41 +0200360
Johannes Berg8fc214b2010-04-28 17:40:43 +0200361 sdata->vif.bss_conf.ibss_joined = true;
Sujith Manoharanc13a7652012-10-12 17:35:45 +0530362 sdata->vif.bss_conf.ibss_creator = creator;
Johannes Berg46900292009-02-15 12:44:28 +0100363
Johannes Berg55fff502013-08-19 18:48:41 +0200364 err = drv_join_ibss(local, sdata);
365 if (err) {
366 sdata->vif.bss_conf.ibss_joined = false;
367 sdata->vif.bss_conf.ibss_creator = false;
368 sdata->vif.bss_conf.enable_beacon = false;
369 sdata->vif.bss_conf.ssid_len = 0;
370 RCU_INIT_POINTER(ifibss->presp, NULL);
371 kfree_rcu(presp, rcu_head);
Johannes Berg34a37402013-12-18 09:43:33 +0100372 mutex_lock(&local->mtx);
Johannes Berg55fff502013-08-19 18:48:41 +0200373 ieee80211_vif_release_channel(sdata);
Johannes Berg34a37402013-12-18 09:43:33 +0100374 mutex_unlock(&local->mtx);
Johannes Berg55fff502013-08-19 18:48:41 +0200375 sdata_info(sdata, "Failed to join IBSS, driver failure: %d\n",
376 err);
377 return;
378 }
379
380 ieee80211_bss_info_change_notify(sdata, bss_change);
Johannes Berg46900292009-02-15 12:44:28 +0100381
Johannes Berg46900292009-02-15 12:44:28 +0100382 ifibss->state = IEEE80211_IBSS_MLME_JOINED;
Johannes Bergaf8cdcd2009-04-19 21:25:43 +0200383 mod_timer(&ifibss->timer,
384 round_jiffies(jiffies + IEEE80211_IBSS_MERGE_INTERVAL));
Johannes Berg46900292009-02-15 12:44:28 +0100385
Johannes Berg61f6bba2015-10-13 11:36:21 +0200386 bss_meta.chan = chan;
387 bss_meta.scan_width = cfg80211_chandef_to_scan_width(&chandef);
388 bss = cfg80211_inform_bss_frame_data(local->hw.wiphy, &bss_meta, mgmt,
389 presp->head_len, GFP_KERNEL);
390
Johannes Berg5b112d32013-02-01 01:49:58 +0100391 cfg80211_put_bss(local->hw.wiphy, bss);
Eliad Peller86a2ea42011-11-08 15:36:59 +0200392 netif_carrier_on(sdata->dev);
Antonio Quartullife94f3a2014-01-29 17:53:43 +0100393 cfg80211_ibss_joined(sdata->dev, ifibss->bssid, chan, GFP_KERNEL);
Johannes Berg46900292009-02-15 12:44:28 +0100394}
395
Johannes Bergaf8cdcd2009-04-19 21:25:43 +0200396static void ieee80211_sta_join_ibss(struct ieee80211_sub_if_data *sdata,
397 struct ieee80211_bss *bss)
Johannes Berg46900292009-02-15 12:44:28 +0100398{
Johannes Berg0c1ad2c2009-12-23 13:15:39 +0100399 struct cfg80211_bss *cbss =
400 container_of((void *)bss, struct cfg80211_bss, priv);
Johannes Bergb59066a2009-05-12 21:18:38 +0200401 struct ieee80211_supported_band *sband;
Simon Wunderlich75a423f2013-08-21 15:30:25 +0200402 struct cfg80211_chan_def chandef;
Johannes Bergb59066a2009-05-12 21:18:38 +0200403 u32 basic_rates;
404 int i, j;
Johannes Berg0c1ad2c2009-12-23 13:15:39 +0100405 u16 beacon_int = cbss->beacon_interval;
Johannes Berg8cef2c92013-02-05 16:54:31 +0100406 const struct cfg80211_bss_ies *ies;
Simon Wunderlich75a423f2013-08-21 15:30:25 +0200407 enum nl80211_channel_type chan_type;
Johannes Berg8cef2c92013-02-05 16:54:31 +0100408 u64 tsf;
Simon Wunderlich2103dec2013-07-08 16:55:53 +0200409 u32 rate_flags;
410 int shift;
Johannes Berg57c4d7b2009-04-23 16:10:04 +0200411
Johannes Berg8d61ffa2013-05-10 12:32:47 +0200412 sdata_assert_lock(sdata);
Johannes Berg7a17a332010-07-21 11:30:27 +0200413
Johannes Berg57c4d7b2009-04-23 16:10:04 +0200414 if (beacon_int < 10)
415 beacon_int = 10;
416
Simon Wunderlich75a423f2013-08-21 15:30:25 +0200417 switch (sdata->u.ibss.chandef.width) {
418 case NL80211_CHAN_WIDTH_20_NOHT:
419 case NL80211_CHAN_WIDTH_20:
420 case NL80211_CHAN_WIDTH_40:
421 chan_type = cfg80211_get_chandef_type(&sdata->u.ibss.chandef);
422 cfg80211_chandef_create(&chandef, cbss->channel, chan_type);
423 break;
424 case NL80211_CHAN_WIDTH_5:
425 case NL80211_CHAN_WIDTH_10:
426 cfg80211_chandef_create(&chandef, cbss->channel,
427 NL80211_CHAN_WIDTH_20_NOHT);
428 chandef.width = sdata->u.ibss.chandef.width;
429 break;
Janusz.Dziedzic@tieto.comabcff6e2015-03-20 06:37:01 +0100430 case NL80211_CHAN_WIDTH_80:
Jouni Malinenc39b3362015-11-26 20:49:38 +0200431 case NL80211_CHAN_WIDTH_80P80:
Janusz.Dziedzic@tieto.comabcff6e2015-03-20 06:37:01 +0100432 case NL80211_CHAN_WIDTH_160:
433 chandef = sdata->u.ibss.chandef;
434 chandef.chan = cbss->channel;
435 break;
Simon Wunderlich75a423f2013-08-21 15:30:25 +0200436 default:
437 /* fall back to 20 MHz for unsupported modes */
438 cfg80211_chandef_create(&chandef, cbss->channel,
439 NL80211_CHAN_WIDTH_20_NOHT);
440 break;
441 }
442
Johannes Berg0c1ad2c2009-12-23 13:15:39 +0100443 sband = sdata->local->hw.wiphy->bands[cbss->channel->band];
Simon Wunderlich2103dec2013-07-08 16:55:53 +0200444 rate_flags = ieee80211_chandef_rate_flags(&sdata->u.ibss.chandef);
445 shift = ieee80211_vif_get_shift(&sdata->vif);
Johannes Bergb59066a2009-05-12 21:18:38 +0200446
447 basic_rates = 0;
448
449 for (i = 0; i < bss->supp_rates_len; i++) {
Simon Wunderlich2103dec2013-07-08 16:55:53 +0200450 int rate = bss->supp_rates[i] & 0x7f;
Johannes Bergb59066a2009-05-12 21:18:38 +0200451 bool is_basic = !!(bss->supp_rates[i] & 0x80);
452
453 for (j = 0; j < sband->n_bitrates; j++) {
Simon Wunderlich2103dec2013-07-08 16:55:53 +0200454 int brate;
455 if ((rate_flags & sband->bitrates[j].flags)
456 != rate_flags)
457 continue;
458
459 brate = DIV_ROUND_UP(sband->bitrates[j].bitrate,
460 5 * (1 << shift));
461 if (brate == rate) {
Johannes Bergb59066a2009-05-12 21:18:38 +0200462 if (is_basic)
463 basic_rates |= BIT(j);
464 break;
465 }
466 }
467 }
468
Johannes Berg8cef2c92013-02-05 16:54:31 +0100469 rcu_read_lock();
470 ies = rcu_dereference(cbss->ies);
471 tsf = ies->tsf;
472 rcu_read_unlock();
473
Johannes Berg0c1ad2c2009-12-23 13:15:39 +0100474 __ieee80211_sta_join_ibss(sdata, cbss->bssid,
Johannes Berg57c4d7b2009-04-23 16:10:04 +0200475 beacon_int,
Simon Wunderlich75a423f2013-08-21 15:30:25 +0200476 &chandef,
Johannes Bergb59066a2009-05-12 21:18:38 +0200477 basic_rates,
Johannes Berg0c1ad2c2009-12-23 13:15:39 +0100478 cbss->capability,
Johannes Berg8cef2c92013-02-05 16:54:31 +0100479 tsf, false);
Johannes Berg46900292009-02-15 12:44:28 +0100480}
481
Simon Wunderlichcd7760e2013-08-28 13:41:31 +0200482int ieee80211_ibss_csa_beacon(struct ieee80211_sub_if_data *sdata,
483 struct cfg80211_csa_settings *csa_settings)
484{
485 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
486 struct beacon_data *presp, *old_presp;
487 struct cfg80211_bss *cbss;
488 const struct cfg80211_bss_ies *ies;
Dedy Lansky6eb18132015-02-08 15:52:03 +0200489 u16 capability = 0;
Simon Wunderlichcd7760e2013-08-28 13:41:31 +0200490 u64 tsf;
491 int ret = 0;
492
493 sdata_assert_lock(sdata);
494
Simon Wunderlichcd7760e2013-08-28 13:41:31 +0200495 if (ifibss->privacy)
Dedy Lansky6eb18132015-02-08 15:52:03 +0200496 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
503 if (WARN_ON(!cbss)) {
504 ret = -EINVAL;
505 goto out;
506 }
507
508 rcu_read_lock();
509 ies = rcu_dereference(cbss->ies);
510 tsf = ies->tsf;
511 rcu_read_unlock();
512 cfg80211_put_bss(sdata->local->hw.wiphy, cbss);
513
514 old_presp = rcu_dereference_protected(ifibss->presp,
515 lockdep_is_held(&sdata->wdev.mtx));
516
517 presp = ieee80211_ibss_build_presp(sdata,
518 sdata->vif.bss_conf.beacon_int,
519 sdata->vif.bss_conf.basic_rates,
520 capability, tsf, &ifibss->chandef,
521 NULL, csa_settings);
522 if (!presp) {
523 ret = -ENOMEM;
524 goto out;
525 }
526
527 rcu_assign_pointer(ifibss->presp, presp);
528 if (old_presp)
529 kfree_rcu(old_presp, rcu_head);
530
Luciano Coelhodddd5862013-12-13 21:13:51 +0200531 return BSS_CHANGED_BEACON;
Simon Wunderlichcd7760e2013-08-28 13:41:31 +0200532 out:
533 return ret;
534}
535
536int ieee80211_ibss_finish_csa(struct ieee80211_sub_if_data *sdata)
537{
538 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
539 struct cfg80211_bss *cbss;
Michal Kaziorfaf046e2014-01-29 07:56:17 +0100540 int err, changed = 0;
Simon Wunderlichcd7760e2013-08-28 13:41:31 +0200541
Simon Wunderlichbafdc612013-12-05 19:54:43 +0100542 sdata_assert_lock(sdata);
543
Simon Wunderlichcd7760e2013-08-28 13:41:31 +0200544 /* update cfg80211 bss information with the new channel */
545 if (!is_zero_ether_addr(ifibss->bssid)) {
Simon Wunderlichcd7760e2013-08-28 13:41:31 +0200546 cbss = cfg80211_get_bss(sdata->local->hw.wiphy,
547 ifibss->chandef.chan,
548 ifibss->bssid, ifibss->ssid,
Dedy Lansky6eb18132015-02-08 15:52:03 +0200549 ifibss->ssid_len,
550 IEEE80211_BSS_TYPE_IBSS,
551 IEEE80211_PRIVACY(ifibss->privacy));
Simon Wunderlichcd7760e2013-08-28 13:41:31 +0200552 /* XXX: should not really modify cfg80211 data */
553 if (cbss) {
Luciano Coelho33787fc2013-11-11 20:34:54 +0200554 cbss->channel = sdata->csa_chandef.chan;
Simon Wunderlichcd7760e2013-08-28 13:41:31 +0200555 cfg80211_put_bss(sdata->local->hw.wiphy, cbss);
556 }
557 }
558
Luciano Coelho33787fc2013-11-11 20:34:54 +0200559 ifibss->chandef = sdata->csa_chandef;
Simon Wunderlichcd7760e2013-08-28 13:41:31 +0200560
561 /* generate the beacon */
562 err = ieee80211_ibss_csa_beacon(sdata, NULL);
Simon Wunderlichcd7760e2013-08-28 13:41:31 +0200563 if (err < 0)
564 return err;
565
Michal Kaziorfaf046e2014-01-29 07:56:17 +0100566 changed |= err;
Luciano Coelhodddd5862013-12-13 21:13:51 +0200567
Michal Kaziorfaf046e2014-01-29 07:56:17 +0100568 return changed;
Simon Wunderlichcd7760e2013-08-28 13:41:31 +0200569}
570
571void ieee80211_ibss_stop(struct ieee80211_sub_if_data *sdata)
572{
573 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
574
575 cancel_work_sync(&ifibss->csa_connection_drop_work);
576}
577
Antonio Quartulli52874a52013-06-18 14:20:40 +0200578static struct sta_info *ieee80211_ibss_finish_sta(struct sta_info *sta)
Johannes Berg8bf11d82011-12-15 11:17:37 +0100579 __acquires(RCU)
580{
581 struct ieee80211_sub_if_data *sdata = sta->sdata;
582 u8 addr[ETH_ALEN];
583
584 memcpy(addr, sta->sta.addr, ETH_ALEN);
585
Johannes Bergbdcbd8e2012-06-22 11:29:50 +0200586 ibss_dbg(sdata, "Adding new IBSS station %pM\n", addr);
Johannes Berg8bf11d82011-12-15 11:17:37 +0100587
Johannes Berg83d5cc02012-01-12 09:31:10 +0100588 sta_info_pre_move_state(sta, IEEE80211_STA_AUTH);
589 sta_info_pre_move_state(sta, IEEE80211_STA_ASSOC);
Antonio Quartulli267335d2012-01-31 20:25:47 +0100590 /* authorize the station only if the network is not RSN protected. If
591 * not wait for the userspace to authorize it */
592 if (!sta->sdata->u.ibss.control_port)
593 sta_info_pre_move_state(sta, IEEE80211_STA_AUTHORIZED);
Johannes Berg8bf11d82011-12-15 11:17:37 +0100594
595 rate_control_rate_init(sta);
596
597 /* If it fails, maybe we raced another insertion? */
598 if (sta_info_insert_rcu(sta))
599 return sta_info_get(sdata, addr);
600 return sta;
601}
602
603static struct sta_info *
Antonio Quartulli52874a52013-06-18 14:20:40 +0200604ieee80211_ibss_add_sta(struct ieee80211_sub_if_data *sdata, const u8 *bssid,
605 const u8 *addr, u32 supp_rates)
Johannes Berg8bf11d82011-12-15 11:17:37 +0100606 __acquires(RCU)
607{
608 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
609 struct ieee80211_local *local = sdata->local;
610 struct sta_info *sta;
Johannes Berg55de9082012-07-26 17:24:39 +0200611 struct ieee80211_chanctx_conf *chanctx_conf;
Ashok Nagarajanb422c6c2013-05-10 17:50:51 -0700612 struct ieee80211_supported_band *sband;
Simon Wunderlich74608ac2013-07-08 16:55:54 +0200613 enum nl80211_bss_scan_width scan_width;
Johannes Berg55de9082012-07-26 17:24:39 +0200614 int band;
Johannes Berg8bf11d82011-12-15 11:17:37 +0100615
616 /*
617 * XXX: Consider removing the least recently used entry and
618 * allow new one to be added.
619 */
620 if (local->num_sta >= IEEE80211_IBSS_MAX_STA_ENTRIES) {
Johannes Bergbdcbd8e2012-06-22 11:29:50 +0200621 net_info_ratelimited("%s: No room for a new IBSS STA entry %pM\n",
Joe Perchese87cc472012-05-13 21:56:26 +0000622 sdata->name, addr);
Johannes Berg8bf11d82011-12-15 11:17:37 +0100623 rcu_read_lock();
624 return NULL;
625 }
626
627 if (ifibss->state == IEEE80211_IBSS_MLME_SEARCH) {
628 rcu_read_lock();
629 return NULL;
630 }
631
Joe Perchesb203ca32012-05-08 18:56:52 +0000632 if (!ether_addr_equal(bssid, sdata->u.ibss.bssid)) {
Johannes Berg8bf11d82011-12-15 11:17:37 +0100633 rcu_read_lock();
634 return NULL;
635 }
636
Johannes Berg55de9082012-07-26 17:24:39 +0200637 rcu_read_lock();
638 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
639 if (WARN_ON_ONCE(!chanctx_conf))
640 return NULL;
Johannes Berg4bf88532012-11-09 11:39:59 +0100641 band = chanctx_conf->def.chan->band;
Simon Wunderlich74608ac2013-07-08 16:55:54 +0200642 scan_width = cfg80211_chandef_to_scan_width(&chanctx_conf->def);
Johannes Berg55de9082012-07-26 17:24:39 +0200643 rcu_read_unlock();
644
Johannes Berg8bf11d82011-12-15 11:17:37 +0100645 sta = sta_info_alloc(sdata, addr, GFP_KERNEL);
646 if (!sta) {
647 rcu_read_lock();
648 return NULL;
649 }
650
Johannes Berge5a9f8d2015-10-16 17:54:47 +0200651 sta->rx_stats.last_rx = jiffies;
Johannes Berg8bf11d82011-12-15 11:17:37 +0100652
653 /* make sure mandatory rates are always added */
Ashok Nagarajanb422c6c2013-05-10 17:50:51 -0700654 sband = local->hw.wiphy->bands[band];
Johannes Berg8bf11d82011-12-15 11:17:37 +0100655 sta->sta.supp_rates[band] = supp_rates |
Simon Wunderlich74608ac2013-07-08 16:55:54 +0200656 ieee80211_mandatory_rates(sband, scan_width);
Johannes Berg8bf11d82011-12-15 11:17:37 +0100657
Antonio Quartulli52874a52013-06-18 14:20:40 +0200658 return ieee80211_ibss_finish_sta(sta);
Antonio Quartulli6d810f12012-01-18 00:10:44 +0100659}
660
Simon Wunderlich871a4182013-08-28 13:41:30 +0200661static int ieee80211_sta_active_ibss(struct ieee80211_sub_if_data *sdata)
662{
663 struct ieee80211_local *local = sdata->local;
664 int active = 0;
665 struct sta_info *sta;
666
667 sdata_assert_lock(sdata);
668
669 rcu_read_lock();
670
671 list_for_each_entry_rcu(sta, &local->sta_list, list) {
672 if (sta->sdata == sdata &&
Johannes Berge5a9f8d2015-10-16 17:54:47 +0200673 time_after(sta->rx_stats.last_rx +
674 IEEE80211_IBSS_MERGE_INTERVAL,
Simon Wunderlich871a4182013-08-28 13:41:30 +0200675 jiffies)) {
676 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;
992 enum ieee80211_band band = rx_status->band;
993 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
1053 ieee80211_ht_oper_to_chandef(channel,
1054 elems->ht_operation,
1055 &chandef);
1056
1057 memcpy(&htcap_ie, elems->ht_cap_elem, sizeof(htcap_ie));
Janusz.Dziedzic@tieto.com8a4988d2015-03-09 07:58:15 +01001058 rates_updated |= ieee80211_ht_cap_ie_to_sta_ht_cap(sdata, sband,
1059 &htcap_ie,
1060 sta);
Janusz.Dziedzic@tieto.comabcff6e2015-03-20 06:37:01 +01001061
1062 if (elems->vht_operation && elems->vht_cap_elem &&
1063 sdata->u.ibss.chandef.width != NL80211_CHAN_WIDTH_20 &&
1064 sdata->u.ibss.chandef.width != NL80211_CHAN_WIDTH_40) {
1065 /* we both use VHT */
1066 struct ieee80211_vht_cap cap_ie;
1067 struct ieee80211_sta_vht_cap cap = sta->sta.vht_cap;
1068
1069 ieee80211_vht_oper_to_chandef(channel,
1070 elems->vht_operation,
1071 &chandef);
1072 memcpy(&cap_ie, elems->vht_cap_elem, sizeof(cap_ie));
1073 ieee80211_vht_cap_ie_to_sta_vht_cap(sdata, sband,
1074 &cap_ie, sta);
1075 if (memcmp(&cap, &sta->sta.vht_cap, sizeof(cap)))
1076 rates_updated |= true;
1077 }
1078
1079 if (bw != sta->sta.bandwidth)
1080 rates_updated |= true;
1081
1082 if (!cfg80211_chandef_compatible(&sdata->u.ibss.chandef,
1083 &chandef))
1084 WARN_ON_ONCE(1);
Janusz.Dziedzic@tieto.com8a4988d2015-03-09 07:58:15 +01001085 }
1086
1087 if (sta && rates_updated) {
1088 u32 changed = IEEE80211_RC_SUPP_RATES_CHANGED;
1089 u8 rx_nss = sta->sta.rx_nss;
1090
1091 /* Force rx_nss recalculation */
1092 sta->sta.rx_nss = 0;
1093 rate_control_rate_init(sta);
1094 if (sta->sta.rx_nss != rx_nss)
1095 changed |= IEEE80211_RC_NSS_CHANGED;
1096
1097 drv_sta_rc_update(local, sdata, &sta->sta, changed);
1098 }
1099
1100 rcu_read_unlock();
1101}
1102
Johannes Berg46900292009-02-15 12:44:28 +01001103static void ieee80211_rx_bss_info(struct ieee80211_sub_if_data *sdata,
Emmanuel Grumbachd45c4172012-12-10 16:19:13 +02001104 struct ieee80211_mgmt *mgmt, size_t len,
Johannes Berg46900292009-02-15 12:44:28 +01001105 struct ieee80211_rx_status *rx_status,
Emmanuel Grumbachd45c4172012-12-10 16:19:13 +02001106 struct ieee802_11_elems *elems)
Johannes Berg46900292009-02-15 12:44:28 +01001107{
1108 struct ieee80211_local *local = sdata->local;
Johannes Berg0c1ad2c2009-12-23 13:15:39 +01001109 struct cfg80211_bss *cbss;
Johannes Berg46900292009-02-15 12:44:28 +01001110 struct ieee80211_bss *bss;
Johannes Berg46900292009-02-15 12:44:28 +01001111 struct ieee80211_channel *channel;
1112 u64 beacon_timestamp, rx_timestamp;
1113 u32 supp_rates = 0;
1114 enum ieee80211_band band = rx_status->band;
1115
Emmanuel Grumbach3afc2162014-03-04 16:50:13 +02001116 channel = ieee80211_get_channel(local->hw.wiphy, rx_status->freq);
1117 if (!channel)
Johannes Berg46900292009-02-15 12:44:28 +01001118 return;
1119
Janusz.Dziedzic@tieto.com8a4988d2015-03-09 07:58:15 +01001120 ieee80211_update_sta_info(sdata, mgmt, len, rx_status, elems, channel);
Johannes Berg46900292009-02-15 12:44:28 +01001121
1122 bss = ieee80211_bss_info_update(local, rx_status, mgmt, len, elems,
Emmanuel Grumbachd45c4172012-12-10 16:19:13 +02001123 channel);
Johannes Berg46900292009-02-15 12:44:28 +01001124 if (!bss)
1125 return;
1126
Johannes Berg0c1ad2c2009-12-23 13:15:39 +01001127 cbss = container_of((void *)bss, struct cfg80211_bss, priv);
1128
Johannes Berg8cef2c92013-02-05 16:54:31 +01001129 /* same for beacon and probe response */
1130 beacon_timestamp = le64_to_cpu(mgmt->u.beacon.timestamp);
Johannes Berg46900292009-02-15 12:44:28 +01001131
1132 /* check if we need to merge IBSS */
1133
Johannes Berg46900292009-02-15 12:44:28 +01001134 /* not an IBSS */
Johannes Berg0c1ad2c2009-12-23 13:15:39 +01001135 if (!(cbss->capability & WLAN_CAPABILITY_IBSS))
Johannes Berg46900292009-02-15 12:44:28 +01001136 goto put_bss;
1137
1138 /* different channel */
Johannes Berg55de9082012-07-26 17:24:39 +02001139 if (sdata->u.ibss.fixed_channel &&
Simon Wunderlich3aede782013-05-16 13:00:36 +02001140 sdata->u.ibss.chandef.chan != cbss->channel)
Johannes Berg46900292009-02-15 12:44:28 +01001141 goto put_bss;
1142
1143 /* different SSID */
1144 if (elems->ssid_len != sdata->u.ibss.ssid_len ||
1145 memcmp(elems->ssid, sdata->u.ibss.ssid,
1146 sdata->u.ibss.ssid_len))
1147 goto put_bss;
1148
Simon Wunderlichcd7760e2013-08-28 13:41:31 +02001149 /* process channel switch */
Luciano Coelho82a8e172013-12-13 21:13:50 +02001150 if (sdata->vif.csa_active ||
1151 ieee80211_ibss_process_chanswitch(sdata, elems, true))
Simon Wunderlichcd7760e2013-08-28 13:41:31 +02001152 goto put_bss;
1153
Alina Friedrichsen34e8f082009-02-22 00:07:28 +01001154 /* same BSSID */
Joe Perchesb203ca32012-05-08 18:56:52 +00001155 if (ether_addr_equal(cbss->bssid, sdata->u.ibss.bssid))
Alina Friedrichsen34e8f082009-02-22 00:07:28 +01001156 goto put_bss;
1157
Simon Wunderlichcd7760e2013-08-28 13:41:31 +02001158 /* we use a fixed BSSID */
1159 if (sdata->u.ibss.fixed_bssid)
1160 goto put_bss;
1161
Thomas Pedersenf4bda332012-11-13 10:46:27 -08001162 if (ieee80211_have_rx_timestamp(rx_status)) {
1163 /* time when timestamp field was received */
1164 rx_timestamp =
1165 ieee80211_calculate_rx_timestamp(local, rx_status,
1166 len + FCS_LEN, 24);
Johannes Berg24487982009-04-23 18:52:52 +02001167 } else {
1168 /*
1169 * second best option: get current TSF
1170 * (will return -1 if not supported)
1171 */
Eliad Peller37a41b42011-09-21 14:06:11 +03001172 rx_timestamp = drv_get_tsf(local, sdata);
Johannes Berg24487982009-04-23 18:52:52 +02001173 }
Johannes Berg46900292009-02-15 12:44:28 +01001174
Johannes Bergbdcbd8e2012-06-22 11:29:50 +02001175 ibss_dbg(sdata,
1176 "RX beacon SA=%pM BSSID=%pM TSF=0x%llx BCN=0x%llx diff=%lld @%lu\n",
1177 mgmt->sa, mgmt->bssid,
1178 (unsigned long long)rx_timestamp,
1179 (unsigned long long)beacon_timestamp,
1180 (unsigned long long)(rx_timestamp - beacon_timestamp),
1181 jiffies);
Johannes Berg46900292009-02-15 12:44:28 +01001182
1183 if (beacon_timestamp > rx_timestamp) {
Johannes Bergbdcbd8e2012-06-22 11:29:50 +02001184 ibss_dbg(sdata,
1185 "beacon TSF higher than local TSF - IBSS merge with BSSID %pM\n",
1186 mgmt->bssid);
Johannes Berg46900292009-02-15 12:44:28 +01001187 ieee80211_sta_join_ibss(sdata, bss);
Simon Wunderlich2103dec2013-07-08 16:55:53 +02001188 supp_rates = ieee80211_sta_get_rates(sdata, elems, band, NULL);
Johannes Berg34e89502010-02-03 13:59:58 +01001189 ieee80211_ibss_add_sta(sdata, mgmt->bssid, mgmt->sa,
Antonio Quartulli52874a52013-06-18 14:20:40 +02001190 supp_rates);
Johannes Berg8bf11d82011-12-15 11:17:37 +01001191 rcu_read_unlock();
Johannes Berg46900292009-02-15 12:44:28 +01001192 }
1193
1194 put_bss:
1195 ieee80211_rx_bss_put(local, bss);
1196}
1197
Johannes Berg8bf11d82011-12-15 11:17:37 +01001198void ieee80211_ibss_rx_no_sta(struct ieee80211_sub_if_data *sdata,
1199 const u8 *bssid, const u8 *addr,
1200 u32 supp_rates)
Johannes Berg46900292009-02-15 12:44:28 +01001201{
Felix Fietkau2e10d332009-12-20 19:07:09 +01001202 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
Johannes Berg46900292009-02-15 12:44:28 +01001203 struct ieee80211_local *local = sdata->local;
1204 struct sta_info *sta;
Johannes Berg55de9082012-07-26 17:24:39 +02001205 struct ieee80211_chanctx_conf *chanctx_conf;
Ashok Nagarajanb422c6c2013-05-10 17:50:51 -07001206 struct ieee80211_supported_band *sband;
Simon Wunderlich74608ac2013-07-08 16:55:54 +02001207 enum nl80211_bss_scan_width scan_width;
Johannes Berg55de9082012-07-26 17:24:39 +02001208 int band;
Johannes Berg46900292009-02-15 12:44:28 +01001209
Johannes Bergaf8cdcd2009-04-19 21:25:43 +02001210 /*
1211 * XXX: Consider removing the least recently used entry and
1212 * allow new one to be added.
1213 */
Johannes Berg46900292009-02-15 12:44:28 +01001214 if (local->num_sta >= IEEE80211_IBSS_MAX_STA_ENTRIES) {
Johannes Bergbdcbd8e2012-06-22 11:29:50 +02001215 net_info_ratelimited("%s: No room for a new IBSS STA entry %pM\n",
Joe Perchese87cc472012-05-13 21:56:26 +00001216 sdata->name, addr);
Johannes Berg8bf11d82011-12-15 11:17:37 +01001217 return;
Johannes Berg46900292009-02-15 12:44:28 +01001218 }
1219
Felix Fietkau2e10d332009-12-20 19:07:09 +01001220 if (ifibss->state == IEEE80211_IBSS_MLME_SEARCH)
Johannes Berg8bf11d82011-12-15 11:17:37 +01001221 return;
Felix Fietkau2e10d332009-12-20 19:07:09 +01001222
Joe Perchesb203ca32012-05-08 18:56:52 +00001223 if (!ether_addr_equal(bssid, sdata->u.ibss.bssid))
Johannes Berg8bf11d82011-12-15 11:17:37 +01001224 return;
Johannes Berg46900292009-02-15 12:44:28 +01001225
Johannes Berg55de9082012-07-26 17:24:39 +02001226 rcu_read_lock();
1227 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
1228 if (WARN_ON_ONCE(!chanctx_conf)) {
1229 rcu_read_unlock();
1230 return;
1231 }
Johannes Berg4bf88532012-11-09 11:39:59 +01001232 band = chanctx_conf->def.chan->band;
Simon Wunderlich74608ac2013-07-08 16:55:54 +02001233 scan_width = cfg80211_chandef_to_scan_width(&chanctx_conf->def);
Johannes Berg55de9082012-07-26 17:24:39 +02001234 rcu_read_unlock();
1235
Johannes Berg8bf11d82011-12-15 11:17:37 +01001236 sta = sta_info_alloc(sdata, addr, GFP_ATOMIC);
Johannes Berg46900292009-02-15 12:44:28 +01001237 if (!sta)
Johannes Berg8bf11d82011-12-15 11:17:37 +01001238 return;
Johannes Berg46900292009-02-15 12:44:28 +01001239
Johannes Berge5a9f8d2015-10-16 17:54:47 +02001240 sta->rx_stats.last_rx = jiffies;
Johannes Bergd9a7ddb2011-12-14 12:35:30 +01001241
Johannes Berg46900292009-02-15 12:44:28 +01001242 /* make sure mandatory rates are always added */
Ashok Nagarajanb422c6c2013-05-10 17:50:51 -07001243 sband = local->hw.wiphy->bands[band];
Johannes Berg46900292009-02-15 12:44:28 +01001244 sta->sta.supp_rates[band] = supp_rates |
Simon Wunderlich74608ac2013-07-08 16:55:54 +02001245 ieee80211_mandatory_rates(sband, scan_width);
Johannes Berg46900292009-02-15 12:44:28 +01001246
Johannes Berg8bf11d82011-12-15 11:17:37 +01001247 spin_lock(&ifibss->incomplete_lock);
1248 list_add(&sta->list, &ifibss->incomplete_stations);
1249 spin_unlock(&ifibss->incomplete_lock);
1250 ieee80211_queue_work(&local->hw, &sdata->work);
Johannes Berg46900292009-02-15 12:44:28 +01001251}
1252
Antonio Quartullidad9def2013-07-26 21:15:02 +02001253static void ieee80211_ibss_sta_expire(struct ieee80211_sub_if_data *sdata)
1254{
1255 struct ieee80211_local *local = sdata->local;
1256 struct sta_info *sta, *tmp;
1257 unsigned long exp_time = IEEE80211_IBSS_INACTIVITY_LIMIT;
Johannes Berge5a9f8d2015-10-16 17:54:47 +02001258 unsigned long exp_rsn = IEEE80211_IBSS_RSN_INACTIVITY_LIMIT;
Antonio Quartullidad9def2013-07-26 21:15:02 +02001259
1260 mutex_lock(&local->sta_mtx);
1261
1262 list_for_each_entry_safe(sta, tmp, &local->sta_list, list) {
1263 if (sdata != sta->sdata)
1264 continue;
1265
Johannes Berge5a9f8d2015-10-16 17:54:47 +02001266 if (time_after(jiffies, sta->rx_stats.last_rx + exp_time) ||
1267 (time_after(jiffies, sta->rx_stats.last_rx + exp_rsn) &&
Antonio Quartullidad9def2013-07-26 21:15:02 +02001268 sta->sta_state != IEEE80211_STA_AUTHORIZED)) {
1269 sta_dbg(sta->sdata, "expiring inactive %sSTA %pM\n",
1270 sta->sta_state != IEEE80211_STA_AUTHORIZED ?
1271 "not authorized " : "", sta->sta.addr);
1272
1273 WARN_ON(__sta_info_destroy(sta));
1274 }
1275 }
1276
1277 mutex_unlock(&local->sta_mtx);
1278}
1279
Benoit Papillaultce9058a2010-01-17 22:45:23 +01001280/*
1281 * This function is called with state == IEEE80211_IBSS_MLME_JOINED
1282 */
Johannes Berg46900292009-02-15 12:44:28 +01001283
1284static void ieee80211_sta_merge_ibss(struct ieee80211_sub_if_data *sdata)
1285{
1286 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
Simon Wunderlich7ca15a02013-07-08 16:55:56 +02001287 enum nl80211_bss_scan_width scan_width;
Johannes Berg46900292009-02-15 12:44:28 +01001288
Johannes Berg8d61ffa2013-05-10 12:32:47 +02001289 sdata_assert_lock(sdata);
Johannes Berg7a17a332010-07-21 11:30:27 +02001290
Johannes Bergaf8cdcd2009-04-19 21:25:43 +02001291 mod_timer(&ifibss->timer,
1292 round_jiffies(jiffies + IEEE80211_IBSS_MERGE_INTERVAL));
Johannes Berg46900292009-02-15 12:44:28 +01001293
Antonio Quartullidad9def2013-07-26 21:15:02 +02001294 ieee80211_ibss_sta_expire(sdata);
Johannes Bergaf8cdcd2009-04-19 21:25:43 +02001295
Sujith450aae32009-11-02 12:33:23 +05301296 if (time_before(jiffies, ifibss->last_scan_completed +
1297 IEEE80211_IBSS_MERGE_INTERVAL))
1298 return;
1299
Johannes Berg46900292009-02-15 12:44:28 +01001300 if (ieee80211_sta_active_ibss(sdata))
1301 return;
1302
John W. Linvillec037b832012-01-30 15:28:11 -05001303 if (ifibss->fixed_channel)
Johannes Berg46900292009-02-15 12:44:28 +01001304 return;
1305
Johannes Bergbdcbd8e2012-06-22 11:29:50 +02001306 sdata_info(sdata,
1307 "No active IBSS STAs - trying to scan for other IBSS networks with same SSID (merge)\n");
Johannes Berg46900292009-02-15 12:44:28 +01001308
Simon Wunderlich7ca15a02013-07-08 16:55:56 +02001309 scan_width = cfg80211_chandef_to_scan_width(&ifibss->chandef);
Stanislaw Gruszka34bcf712012-12-11 10:48:23 +01001310 ieee80211_request_ibss_scan(sdata, ifibss->ssid, ifibss->ssid_len,
Janusz.Dziedzic@tieto.com76bed0f2015-03-20 06:37:00 +01001311 NULL, 0, scan_width);
Johannes Berg46900292009-02-15 12:44:28 +01001312}
1313
Johannes Bergaf8cdcd2009-04-19 21:25:43 +02001314static void ieee80211_sta_create_ibss(struct ieee80211_sub_if_data *sdata)
Johannes Berg46900292009-02-15 12:44:28 +01001315{
1316 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
Johannes Berg46900292009-02-15 12:44:28 +01001317 u8 bssid[ETH_ALEN];
Johannes Berg46900292009-02-15 12:44:28 +01001318 u16 capability;
1319 int i;
1320
Johannes Berg8d61ffa2013-05-10 12:32:47 +02001321 sdata_assert_lock(sdata);
Johannes Berg7a17a332010-07-21 11:30:27 +02001322
Johannes Bergaf8cdcd2009-04-19 21:25:43 +02001323 if (ifibss->fixed_bssid) {
Johannes Berg46900292009-02-15 12:44:28 +01001324 memcpy(bssid, ifibss->bssid, ETH_ALEN);
1325 } else {
1326 /* Generate random, not broadcast, locally administered BSSID. Mix in
1327 * own MAC address to make sure that devices that do not have proper
1328 * random number generator get different BSSID. */
1329 get_random_bytes(bssid, ETH_ALEN);
1330 for (i = 0; i < ETH_ALEN; i++)
Johannes Berg47846c92009-11-25 17:46:19 +01001331 bssid[i] ^= sdata->vif.addr[i];
Johannes Berg46900292009-02-15 12:44:28 +01001332 bssid[0] &= ~0x01;
1333 bssid[0] |= 0x02;
1334 }
1335
Johannes Bergbdcbd8e2012-06-22 11:29:50 +02001336 sdata_info(sdata, "Creating new IBSS network, BSSID %pM\n", bssid);
Johannes Berg46900292009-02-15 12:44:28 +01001337
Johannes Berg46900292009-02-15 12:44:28 +01001338 capability = WLAN_CAPABILITY_IBSS;
1339
Johannes Bergfffd0932009-07-08 14:22:54 +02001340 if (ifibss->privacy)
Johannes Berg46900292009-02-15 12:44:28 +01001341 capability |= WLAN_CAPABILITY_PRIVACY;
Johannes Berg46900292009-02-15 12:44:28 +01001342
Johannes Berg57c4d7b2009-04-23 16:10:04 +02001343 __ieee80211_sta_join_ibss(sdata, bssid, sdata->vif.bss_conf.beacon_int,
Simon Wunderlich75a423f2013-08-21 15:30:25 +02001344 &ifibss->chandef, ifibss->basic_rates,
Sujith Manoharanc13a7652012-10-12 17:35:45 +05301345 capability, 0, true);
Johannes Berg46900292009-02-15 12:44:28 +01001346}
1347
Janusz.Dziedzic@tieto.com76bed0f2015-03-20 06:37:00 +01001348static unsigned ibss_setup_channels(struct wiphy *wiphy,
1349 struct ieee80211_channel **channels,
1350 unsigned int channels_max,
1351 u32 center_freq, u32 width)
1352{
1353 struct ieee80211_channel *chan = NULL;
1354 unsigned int n_chan = 0;
1355 u32 start_freq, end_freq, freq;
1356
1357 if (width <= 20) {
1358 start_freq = center_freq;
1359 end_freq = center_freq;
1360 } else {
1361 start_freq = center_freq - width / 2 + 10;
1362 end_freq = center_freq + width / 2 - 10;
1363 }
1364
1365 for (freq = start_freq; freq <= end_freq; freq += 20) {
1366 chan = ieee80211_get_channel(wiphy, freq);
1367 if (!chan)
1368 continue;
1369 if (n_chan >= channels_max)
1370 return n_chan;
1371
1372 channels[n_chan] = chan;
1373 n_chan++;
1374 }
1375
1376 return n_chan;
1377}
1378
1379static unsigned int
1380ieee80211_ibss_setup_scan_channels(struct wiphy *wiphy,
1381 const struct cfg80211_chan_def *chandef,
1382 struct ieee80211_channel **channels,
1383 unsigned int channels_max)
1384{
1385 unsigned int n_chan = 0;
1386 u32 width, cf1, cf2 = 0;
1387
1388 switch (chandef->width) {
1389 case NL80211_CHAN_WIDTH_40:
1390 width = 40;
1391 break;
1392 case NL80211_CHAN_WIDTH_80P80:
1393 cf2 = chandef->center_freq2;
1394 /* fall through */
1395 case NL80211_CHAN_WIDTH_80:
1396 width = 80;
1397 break;
1398 case NL80211_CHAN_WIDTH_160:
1399 width = 160;
1400 break;
1401 default:
1402 width = 20;
1403 break;
1404 }
1405
1406 cf1 = chandef->center_freq1;
1407
1408 n_chan = ibss_setup_channels(wiphy, channels, channels_max, cf1, width);
1409
1410 if (cf2)
1411 n_chan += ibss_setup_channels(wiphy, &channels[n_chan],
1412 channels_max - n_chan, cf2,
1413 width);
1414
1415 return n_chan;
1416}
1417
Benoit Papillaultce9058a2010-01-17 22:45:23 +01001418/*
1419 * This function is called with state == IEEE80211_IBSS_MLME_SEARCH
1420 */
1421
Johannes Bergaf8cdcd2009-04-19 21:25:43 +02001422static void ieee80211_sta_find_ibss(struct ieee80211_sub_if_data *sdata)
Johannes Berg46900292009-02-15 12:44:28 +01001423{
1424 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1425 struct ieee80211_local *local = sdata->local;
Johannes Berg0c1ad2c2009-12-23 13:15:39 +01001426 struct cfg80211_bss *cbss;
Johannes Bergaf8cdcd2009-04-19 21:25:43 +02001427 struct ieee80211_channel *chan = NULL;
Johannes Berg46900292009-02-15 12:44:28 +01001428 const u8 *bssid = NULL;
Simon Wunderlich7ca15a02013-07-08 16:55:56 +02001429 enum nl80211_bss_scan_width scan_width;
Johannes Berg46900292009-02-15 12:44:28 +01001430 int active_ibss;
1431
Johannes Berg8d61ffa2013-05-10 12:32:47 +02001432 sdata_assert_lock(sdata);
Johannes Berg7a17a332010-07-21 11:30:27 +02001433
Johannes Berg46900292009-02-15 12:44:28 +01001434 active_ibss = ieee80211_sta_active_ibss(sdata);
Johannes Bergbdcbd8e2012-06-22 11:29:50 +02001435 ibss_dbg(sdata, "sta_find_ibss (active_ibss=%d)\n", active_ibss);
Johannes Berg46900292009-02-15 12:44:28 +01001436
1437 if (active_ibss)
Johannes Bergaf8cdcd2009-04-19 21:25:43 +02001438 return;
Johannes Berg46900292009-02-15 12:44:28 +01001439
Johannes Bergaf8cdcd2009-04-19 21:25:43 +02001440 if (ifibss->fixed_bssid)
Johannes Berg46900292009-02-15 12:44:28 +01001441 bssid = ifibss->bssid;
Johannes Bergaf8cdcd2009-04-19 21:25:43 +02001442 if (ifibss->fixed_channel)
Simon Wunderlich3aede782013-05-16 13:00:36 +02001443 chan = ifibss->chandef.chan;
Johannes Bergaf8cdcd2009-04-19 21:25:43 +02001444 if (!is_zero_ether_addr(ifibss->bssid))
1445 bssid = ifibss->bssid;
Johannes Berg0c1ad2c2009-12-23 13:15:39 +01001446 cbss = cfg80211_get_bss(local->hw.wiphy, chan, bssid,
1447 ifibss->ssid, ifibss->ssid_len,
Dedy Lansky6eb18132015-02-08 15:52:03 +02001448 IEEE80211_BSS_TYPE_IBSS,
1449 IEEE80211_PRIVACY(ifibss->privacy));
Johannes Berg46900292009-02-15 12:44:28 +01001450
Johannes Berg0c1ad2c2009-12-23 13:15:39 +01001451 if (cbss) {
1452 struct ieee80211_bss *bss;
1453
1454 bss = (void *)cbss->priv;
Johannes Bergbdcbd8e2012-06-22 11:29:50 +02001455 ibss_dbg(sdata,
1456 "sta_find_ibss: selected %pM current %pM\n",
1457 cbss->bssid, ifibss->bssid);
1458 sdata_info(sdata,
1459 "Selected IBSS BSSID %pM based on configured SSID\n",
1460 cbss->bssid);
Johannes Berg46900292009-02-15 12:44:28 +01001461
Johannes Bergaf8cdcd2009-04-19 21:25:43 +02001462 ieee80211_sta_join_ibss(sdata, bss);
Johannes Berg46900292009-02-15 12:44:28 +01001463 ieee80211_rx_bss_put(local, bss);
Johannes Bergaf8cdcd2009-04-19 21:25:43 +02001464 return;
Reinette Chatred419b9f2009-10-19 14:55:37 -07001465 }
Johannes Berg46900292009-02-15 12:44:28 +01001466
Antonio Quartullid8eb7412013-08-09 18:58:32 +02001467 /* if a fixed bssid and a fixed freq have been provided create the IBSS
1468 * directly and do not waste time scanning
1469 */
1470 if (ifibss->fixed_bssid && ifibss->fixed_channel) {
1471 sdata_info(sdata, "Created IBSS using preconfigured BSSID %pM\n",
1472 bssid);
1473 ieee80211_sta_create_ibss(sdata);
1474 return;
1475 }
1476
1477
Johannes Bergbdcbd8e2012-06-22 11:29:50 +02001478 ibss_dbg(sdata, "sta_find_ibss: did not try to join ibss\n");
Johannes Berg46900292009-02-15 12:44:28 +01001479
1480 /* Selected IBSS not found in current scan results - try to scan */
Benoit Papillaultce9058a2010-01-17 22:45:23 +01001481 if (time_after(jiffies, ifibss->last_scan_completed +
Johannes Berg46900292009-02-15 12:44:28 +01001482 IEEE80211_SCAN_INTERVAL)) {
Janusz.Dziedzic@tieto.com76bed0f2015-03-20 06:37:00 +01001483 struct ieee80211_channel *channels[8];
1484 unsigned int num;
1485
Johannes Bergbdcbd8e2012-06-22 11:29:50 +02001486 sdata_info(sdata, "Trigger new scan to find an IBSS to join\n");
Johannes Berg46900292009-02-15 12:44:28 +01001487
Janusz.Dziedzic@tieto.com76bed0f2015-03-20 06:37:00 +01001488 num = ieee80211_ibss_setup_scan_channels(local->hw.wiphy,
1489 &ifibss->chandef,
1490 channels,
1491 ARRAY_SIZE(channels));
Simon Wunderlich7ca15a02013-07-08 16:55:56 +02001492 scan_width = cfg80211_chandef_to_scan_width(&ifibss->chandef);
Stanislaw Gruszka34bcf712012-12-11 10:48:23 +01001493 ieee80211_request_ibss_scan(sdata, ifibss->ssid,
Janusz.Dziedzic@tieto.com76bed0f2015-03-20 06:37:00 +01001494 ifibss->ssid_len, channels, num,
Simon Wunderlich7ca15a02013-07-08 16:55:56 +02001495 scan_width);
Benoit Papillaultce9058a2010-01-17 22:45:23 +01001496 } else {
Johannes Berg46900292009-02-15 12:44:28 +01001497 int interval = IEEE80211_SCAN_INTERVAL;
1498
1499 if (time_after(jiffies, ifibss->ibss_join_req +
Johannes Berg55de9082012-07-26 17:24:39 +02001500 IEEE80211_IBSS_JOIN_TIMEOUT))
1501 ieee80211_sta_create_ibss(sdata);
Johannes Berg46900292009-02-15 12:44:28 +01001502
Johannes Bergaf8cdcd2009-04-19 21:25:43 +02001503 mod_timer(&ifibss->timer,
1504 round_jiffies(jiffies + interval));
Johannes Berg46900292009-02-15 12:44:28 +01001505 }
Johannes Berg46900292009-02-15 12:44:28 +01001506}
1507
1508static void ieee80211_rx_mgmt_probe_req(struct ieee80211_sub_if_data *sdata,
Johannes Bergc269a202011-02-14 12:20:22 +01001509 struct sk_buff *req)
Johannes Berg46900292009-02-15 12:44:28 +01001510{
Johannes Bergc269a202011-02-14 12:20:22 +01001511 struct ieee80211_mgmt *mgmt = (void *)req->data;
Johannes Berg46900292009-02-15 12:44:28 +01001512 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1513 struct ieee80211_local *local = sdata->local;
Johannes Bergc269a202011-02-14 12:20:22 +01001514 int tx_last_beacon, len = req->len;
Johannes Berg46900292009-02-15 12:44:28 +01001515 struct sk_buff *skb;
Johannes Bergc3ffeab2013-03-07 20:54:29 +01001516 struct beacon_data *presp;
Johannes Berg46900292009-02-15 12:44:28 +01001517 u8 *pos, *end;
1518
Johannes Berg8d61ffa2013-05-10 12:32:47 +02001519 sdata_assert_lock(sdata);
Johannes Berg7a17a332010-07-21 11:30:27 +02001520
Johannes Berg40b275b2011-05-13 14:15:49 +02001521 presp = rcu_dereference_protected(ifibss->presp,
Johannes Berg8d61ffa2013-05-10 12:32:47 +02001522 lockdep_is_held(&sdata->wdev.mtx));
Johannes Berg40b275b2011-05-13 14:15:49 +02001523
Johannes Berg46900292009-02-15 12:44:28 +01001524 if (ifibss->state != IEEE80211_IBSS_MLME_JOINED ||
Johannes Berg40b275b2011-05-13 14:15:49 +02001525 len < 24 + 2 || !presp)
Johannes Berg46900292009-02-15 12:44:28 +01001526 return;
1527
Johannes Berg24487982009-04-23 18:52:52 +02001528 tx_last_beacon = drv_tx_last_beacon(local);
Johannes Berg46900292009-02-15 12:44:28 +01001529
Johannes Bergbdcbd8e2012-06-22 11:29:50 +02001530 ibss_dbg(sdata,
1531 "RX ProbeReq SA=%pM DA=%pM BSSID=%pM (tx_last_beacon=%d)\n",
1532 mgmt->sa, mgmt->da, mgmt->bssid, tx_last_beacon);
Johannes Berg46900292009-02-15 12:44:28 +01001533
Felix Fietkau1ed76482011-03-24 19:46:18 +01001534 if (!tx_last_beacon && is_multicast_ether_addr(mgmt->da))
Johannes Berg46900292009-02-15 12:44:28 +01001535 return;
1536
Joe Perchesb203ca32012-05-08 18:56:52 +00001537 if (!ether_addr_equal(mgmt->bssid, ifibss->bssid) &&
Felix Fietkau888d04d2012-03-01 15:22:09 +01001538 !is_broadcast_ether_addr(mgmt->bssid))
Johannes Berg46900292009-02-15 12:44:28 +01001539 return;
1540
1541 end = ((u8 *) mgmt) + len;
1542 pos = mgmt->u.probe_req.variable;
1543 if (pos[0] != WLAN_EID_SSID ||
1544 pos + 2 + pos[1] > end) {
Johannes Bergbdcbd8e2012-06-22 11:29:50 +02001545 ibss_dbg(sdata, "Invalid SSID IE in ProbeReq from %pM\n",
1546 mgmt->sa);
Johannes Berg46900292009-02-15 12:44:28 +01001547 return;
1548 }
1549 if (pos[1] != 0 &&
1550 (pos[1] != ifibss->ssid_len ||
Benoit Papillault0da780c2010-02-05 01:21:03 +01001551 memcmp(pos + 2, ifibss->ssid, ifibss->ssid_len))) {
Johannes Berg46900292009-02-15 12:44:28 +01001552 /* Ignore ProbeReq for foreign SSID */
1553 return;
1554 }
1555
1556 /* Reply with ProbeResp */
Johannes Bergc3ffeab2013-03-07 20:54:29 +01001557 skb = dev_alloc_skb(local->tx_headroom + presp->head_len);
Johannes Berg46900292009-02-15 12:44:28 +01001558 if (!skb)
1559 return;
1560
Johannes Bergc3ffeab2013-03-07 20:54:29 +01001561 skb_reserve(skb, local->tx_headroom);
1562 memcpy(skb_put(skb, presp->head_len), presp->head, presp->head_len);
1563
1564 memcpy(((struct ieee80211_mgmt *) skb->data)->da, mgmt->sa, ETH_ALEN);
1565 ibss_dbg(sdata, "Sending ProbeResp to %pM\n", mgmt->sa);
Johannes Berg62ae67b2009-11-18 18:42:05 +01001566 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
Simon Wunderlich691eb612014-01-24 23:48:29 +01001567
1568 /* avoid excessive retries for probe request to wildcard SSIDs */
1569 if (pos[1] == 0)
1570 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_CTL_NO_ACK;
1571
Johannes Berg62ae67b2009-11-18 18:42:05 +01001572 ieee80211_tx_skb(sdata, skb);
Johannes Berg46900292009-02-15 12:44:28 +01001573}
1574
Emmanuel Grumbachd45c4172012-12-10 16:19:13 +02001575static
1576void ieee80211_rx_mgmt_probe_beacon(struct ieee80211_sub_if_data *sdata,
1577 struct ieee80211_mgmt *mgmt, size_t len,
1578 struct ieee80211_rx_status *rx_status)
Johannes Berg46900292009-02-15 12:44:28 +01001579{
1580 size_t baselen;
1581 struct ieee802_11_elems elems;
1582
Emmanuel Grumbachd45c4172012-12-10 16:19:13 +02001583 BUILD_BUG_ON(offsetof(typeof(mgmt->u.probe_resp), variable) !=
1584 offsetof(typeof(mgmt->u.beacon), variable));
1585
1586 /*
1587 * either beacon or probe_resp but the variable field is at the
1588 * same offset
1589 */
Johannes Berg46900292009-02-15 12:44:28 +01001590 baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt;
1591 if (baselen > len)
1592 return;
1593
1594 ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen,
Johannes Bergb2e506b2013-03-26 14:54:16 +01001595 false, &elems);
Johannes Berg46900292009-02-15 12:44:28 +01001596
Emmanuel Grumbachd45c4172012-12-10 16:19:13 +02001597 ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems);
Johannes Berg46900292009-02-15 12:44:28 +01001598}
1599
Johannes Berg1fa57d02010-06-10 10:21:32 +02001600void ieee80211_ibss_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata,
1601 struct sk_buff *skb)
Johannes Berg46900292009-02-15 12:44:28 +01001602{
1603 struct ieee80211_rx_status *rx_status;
1604 struct ieee80211_mgmt *mgmt;
1605 u16 fc;
Simon Wunderlichcd7760e2013-08-28 13:41:31 +02001606 struct ieee802_11_elems elems;
1607 int ies_len;
Johannes Berg46900292009-02-15 12:44:28 +01001608
Johannes Bergf1d58c22009-06-17 13:13:00 +02001609 rx_status = IEEE80211_SKB_RXCB(skb);
Johannes Berg46900292009-02-15 12:44:28 +01001610 mgmt = (struct ieee80211_mgmt *) skb->data;
1611 fc = le16_to_cpu(mgmt->frame_control);
1612
Johannes Berg8d61ffa2013-05-10 12:32:47 +02001613 sdata_lock(sdata);
Johannes Berg7a17a332010-07-21 11:30:27 +02001614
Tim Harveyc926d002010-12-09 10:43:13 -08001615 if (!sdata->u.ibss.ssid_len)
1616 goto mgmt_out; /* not ready to merge yet */
1617
Johannes Berg46900292009-02-15 12:44:28 +01001618 switch (fc & IEEE80211_FCTL_STYPE) {
1619 case IEEE80211_STYPE_PROBE_REQ:
Johannes Bergc269a202011-02-14 12:20:22 +01001620 ieee80211_rx_mgmt_probe_req(sdata, skb);
Johannes Berg46900292009-02-15 12:44:28 +01001621 break;
1622 case IEEE80211_STYPE_PROBE_RESP:
Johannes Berg46900292009-02-15 12:44:28 +01001623 case IEEE80211_STYPE_BEACON:
Emmanuel Grumbachd45c4172012-12-10 16:19:13 +02001624 ieee80211_rx_mgmt_probe_beacon(sdata, mgmt, skb->len,
1625 rx_status);
Johannes Berg46900292009-02-15 12:44:28 +01001626 break;
1627 case IEEE80211_STYPE_AUTH:
1628 ieee80211_rx_mgmt_auth_ibss(sdata, mgmt, skb->len);
1629 break;
Antonio Quartulli2cc59e72012-09-07 13:28:53 +02001630 case IEEE80211_STYPE_DEAUTH:
1631 ieee80211_rx_mgmt_deauth_ibss(sdata, mgmt, skb->len);
1632 break;
Simon Wunderlichcd7760e2013-08-28 13:41:31 +02001633 case IEEE80211_STYPE_ACTION:
1634 switch (mgmt->u.action.category) {
1635 case WLAN_CATEGORY_SPECTRUM_MGMT:
1636 ies_len = skb->len -
1637 offsetof(struct ieee80211_mgmt,
1638 u.action.u.chan_switch.variable);
1639
1640 if (ies_len < 0)
1641 break;
1642
1643 ieee802_11_parse_elems(
1644 mgmt->u.action.u.chan_switch.variable,
1645 ies_len, true, &elems);
1646
1647 if (elems.parse_error)
1648 break;
1649
1650 ieee80211_rx_mgmt_spectrum_mgmt(sdata, mgmt, skb->len,
1651 rx_status, &elems);
1652 break;
1653 }
Johannes Berg46900292009-02-15 12:44:28 +01001654 }
Johannes Berg7a17a332010-07-21 11:30:27 +02001655
Tim Harveyc926d002010-12-09 10:43:13 -08001656 mgmt_out:
Johannes Berg8d61ffa2013-05-10 12:32:47 +02001657 sdata_unlock(sdata);
Johannes Berg46900292009-02-15 12:44:28 +01001658}
1659
Johannes Berg1fa57d02010-06-10 10:21:32 +02001660void ieee80211_ibss_work(struct ieee80211_sub_if_data *sdata)
Johannes Berg46900292009-02-15 12:44:28 +01001661{
Johannes Berg1fa57d02010-06-10 10:21:32 +02001662 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
Johannes Berg8bf11d82011-12-15 11:17:37 +01001663 struct sta_info *sta;
Johannes Berg46900292009-02-15 12:44:28 +01001664
Johannes Berg8d61ffa2013-05-10 12:32:47 +02001665 sdata_lock(sdata);
Johannes Berg7a17a332010-07-21 11:30:27 +02001666
1667 /*
1668 * Work could be scheduled after scan or similar
1669 * when we aren't even joined (or trying) with a
1670 * network.
1671 */
1672 if (!ifibss->ssid_len)
1673 goto out;
Johannes Berg46900292009-02-15 12:44:28 +01001674
Johannes Berg8bf11d82011-12-15 11:17:37 +01001675 spin_lock_bh(&ifibss->incomplete_lock);
1676 while (!list_empty(&ifibss->incomplete_stations)) {
1677 sta = list_first_entry(&ifibss->incomplete_stations,
1678 struct sta_info, list);
1679 list_del(&sta->list);
1680 spin_unlock_bh(&ifibss->incomplete_lock);
1681
Antonio Quartulli52874a52013-06-18 14:20:40 +02001682 ieee80211_ibss_finish_sta(sta);
Johannes Berg8bf11d82011-12-15 11:17:37 +01001683 rcu_read_unlock();
1684 spin_lock_bh(&ifibss->incomplete_lock);
1685 }
1686 spin_unlock_bh(&ifibss->incomplete_lock);
1687
Johannes Berg46900292009-02-15 12:44:28 +01001688 switch (ifibss->state) {
1689 case IEEE80211_IBSS_MLME_SEARCH:
1690 ieee80211_sta_find_ibss(sdata);
1691 break;
1692 case IEEE80211_IBSS_MLME_JOINED:
1693 ieee80211_sta_merge_ibss(sdata);
1694 break;
1695 default:
1696 WARN_ON(1);
1697 break;
1698 }
Johannes Berg46900292009-02-15 12:44:28 +01001699
Johannes Berg7a17a332010-07-21 11:30:27 +02001700 out:
Johannes Berg8d61ffa2013-05-10 12:32:47 +02001701 sdata_unlock(sdata);
Johannes Berg3a4d4aa2010-05-26 16:41:40 +02001702}
1703
Johannes Berg46900292009-02-15 12:44:28 +01001704static void ieee80211_ibss_timer(unsigned long data)
1705{
1706 struct ieee80211_sub_if_data *sdata =
1707 (struct ieee80211_sub_if_data *) data;
Johannes Berg46900292009-02-15 12:44:28 +01001708
Stanislaw Gruszkaa6182942013-02-28 10:55:28 +01001709 ieee80211_queue_work(&sdata->local->hw, &sdata->work);
Johannes Berg46900292009-02-15 12:44:28 +01001710}
1711
1712void ieee80211_ibss_setup_sdata(struct ieee80211_sub_if_data *sdata)
1713{
1714 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1715
Johannes Berg46900292009-02-15 12:44:28 +01001716 setup_timer(&ifibss->timer, ieee80211_ibss_timer,
1717 (unsigned long) sdata);
Johannes Berg8bf11d82011-12-15 11:17:37 +01001718 INIT_LIST_HEAD(&ifibss->incomplete_stations);
1719 spin_lock_init(&ifibss->incomplete_lock);
Simon Wunderlichcd7760e2013-08-28 13:41:31 +02001720 INIT_WORK(&ifibss->csa_connection_drop_work,
1721 ieee80211_csa_connection_drop_work);
Johannes Berg46900292009-02-15 12:44:28 +01001722}
1723
1724/* scan finished notification */
1725void ieee80211_ibss_notify_scan_completed(struct ieee80211_local *local)
1726{
Johannes Bergaf8cdcd2009-04-19 21:25:43 +02001727 struct ieee80211_sub_if_data *sdata;
Johannes Berg46900292009-02-15 12:44:28 +01001728
Johannes Berg29b4a4f2009-04-21 00:30:49 +02001729 mutex_lock(&local->iflist_mtx);
1730 list_for_each_entry(sdata, &local->interfaces, list) {
Johannes Berg9607e6b2009-12-23 13:15:31 +01001731 if (!ieee80211_sdata_running(sdata))
Johannes Berg0e41f712009-04-23 11:48:56 +02001732 continue;
Johannes Bergaf8cdcd2009-04-19 21:25:43 +02001733 if (sdata->vif.type != NL80211_IFTYPE_ADHOC)
1734 continue;
1735 sdata->u.ibss.last_scan_completed = jiffies;
Johannes Berg46900292009-02-15 12:44:28 +01001736 }
Johannes Berg29b4a4f2009-04-21 00:30:49 +02001737 mutex_unlock(&local->iflist_mtx);
Johannes Berg46900292009-02-15 12:44:28 +01001738}
1739
Johannes Bergaf8cdcd2009-04-19 21:25:43 +02001740int ieee80211_ibss_join(struct ieee80211_sub_if_data *sdata,
1741 struct cfg80211_ibss_params *params)
1742{
Simon Wunderlichff3cc5f2011-11-30 16:56:33 +01001743 u32 changed = 0;
Simon Wunderlich2103dec2013-07-08 16:55:53 +02001744 u32 rate_flags;
1745 struct ieee80211_supported_band *sband;
Luciano Coelho71965c12014-02-18 17:07:53 +02001746 enum ieee80211_chanctx_mode chanmode;
1747 struct ieee80211_local *local = sdata->local;
1748 int radar_detect_width = 0;
Simon Wunderlich2103dec2013-07-08 16:55:53 +02001749 int i;
Luciano Coelho71965c12014-02-18 17:07:53 +02001750 int ret;
1751
1752 ret = cfg80211_chandef_dfs_required(local->hw.wiphy,
1753 &params->chandef,
1754 sdata->wdev.iftype);
1755 if (ret < 0)
1756 return ret;
1757
1758 if (ret > 0) {
1759 if (!params->userspace_handles_dfs)
1760 return -EINVAL;
1761 radar_detect_width = BIT(params->chandef.width);
1762 }
1763
1764 chanmode = (params->channel_fixed && !ret) ?
1765 IEEE80211_CHANCTX_SHARED : IEEE80211_CHANCTX_EXCLUSIVE;
1766
1767 mutex_lock(&local->chanctx_mtx);
1768 ret = ieee80211_check_combinations(sdata, &params->chandef, chanmode,
1769 radar_detect_width);
1770 mutex_unlock(&local->chanctx_mtx);
1771 if (ret < 0)
1772 return ret;
Johannes Bergaf8cdcd2009-04-19 21:25:43 +02001773
Johannes Bergaf8cdcd2009-04-19 21:25:43 +02001774 if (params->bssid) {
1775 memcpy(sdata->u.ibss.bssid, params->bssid, ETH_ALEN);
1776 sdata->u.ibss.fixed_bssid = true;
1777 } else
1778 sdata->u.ibss.fixed_bssid = false;
1779
Johannes Bergfffd0932009-07-08 14:22:54 +02001780 sdata->u.ibss.privacy = params->privacy;
Antonio Quartulli267335d2012-01-31 20:25:47 +01001781 sdata->u.ibss.control_port = params->control_port;
Simon Wunderlich8e8d3472013-10-07 18:41:06 +02001782 sdata->u.ibss.userspace_handles_dfs = params->userspace_handles_dfs;
Teemu Paasikivifbd2c8d2010-06-14 12:55:31 +03001783 sdata->u.ibss.basic_rates = params->basic_rates;
Krzysztof HaƂasac7d37a62014-05-26 14:14:46 +02001784 sdata->u.ibss.last_scan_completed = jiffies;
Simon Wunderlich2103dec2013-07-08 16:55:53 +02001785
1786 /* fix basic_rates if channel does not support these rates */
1787 rate_flags = ieee80211_chandef_rate_flags(&params->chandef);
Luciano Coelho71965c12014-02-18 17:07:53 +02001788 sband = local->hw.wiphy->bands[params->chandef.chan->band];
Simon Wunderlich2103dec2013-07-08 16:55:53 +02001789 for (i = 0; i < sband->n_bitrates; i++) {
1790 if ((rate_flags & sband->bitrates[i].flags) != rate_flags)
1791 sdata->u.ibss.basic_rates &= ~BIT(i);
1792 }
Felix Fietkaudd5b4cc2010-11-22 20:58:24 +01001793 memcpy(sdata->vif.bss_conf.mcast_rate, params->mcast_rate,
1794 sizeof(params->mcast_rate));
Johannes Bergfffd0932009-07-08 14:22:54 +02001795
Johannes Berg57c4d7b2009-04-23 16:10:04 +02001796 sdata->vif.bss_conf.beacon_int = params->beacon_interval;
1797
Simon Wunderlich3aede782013-05-16 13:00:36 +02001798 sdata->u.ibss.chandef = params->chandef;
Johannes Bergaf8cdcd2009-04-19 21:25:43 +02001799 sdata->u.ibss.fixed_channel = params->channel_fixed;
1800
1801 if (params->ie) {
1802 sdata->u.ibss.ie = kmemdup(params->ie, params->ie_len,
1803 GFP_KERNEL);
1804 if (sdata->u.ibss.ie)
1805 sdata->u.ibss.ie_len = params->ie_len;
1806 }
1807
Johannes Bergaf8cdcd2009-04-19 21:25:43 +02001808 sdata->u.ibss.state = IEEE80211_IBSS_MLME_SEARCH;
1809 sdata->u.ibss.ibss_join_req = jiffies;
1810
Antonio Quartullibadecb02012-10-26 18:54:25 +02001811 memcpy(sdata->u.ibss.ssid, params->ssid, params->ssid_len);
Johannes Berg0e41f712009-04-23 11:48:56 +02001812 sdata->u.ibss.ssid_len = params->ssid_len;
1813
Simon Wunderlich822854b2013-06-28 10:39:59 +02001814 memcpy(&sdata->u.ibss.ht_capa, &params->ht_capa,
1815 sizeof(sdata->u.ibss.ht_capa));
1816 memcpy(&sdata->u.ibss.ht_capa_mask, &params->ht_capa_mask,
1817 sizeof(sdata->u.ibss.ht_capa_mask));
1818
Simon Wunderlichff3cc5f2011-11-30 16:56:33 +01001819 /*
1820 * 802.11n-2009 9.13.3.1: In an IBSS, the HT Protection field is
1821 * reserved, but an HT STA shall protect HT transmissions as though
1822 * the HT Protection field were set to non-HT mixed mode.
1823 *
1824 * In an IBSS, the RIFS Mode field of the HT Operation element is
1825 * also reserved, but an HT STA shall operate as though this field
1826 * were set to 1.
1827 */
1828
1829 sdata->vif.bss_conf.ht_operation_mode |=
1830 IEEE80211_HT_OP_MODE_PROTECTION_NONHT_MIXED
1831 | IEEE80211_HT_PARAM_RIFS_MODE;
1832
1833 changed |= BSS_CHANGED_HT;
1834 ieee80211_bss_info_change_notify(sdata, changed);
1835
Johannes Berg04ecd252012-09-11 14:34:12 +02001836 sdata->smps_mode = IEEE80211_SMPS_OFF;
Luciano Coelho71965c12014-02-18 17:07:53 +02001837 sdata->needed_rx_chains = local->rx_chains;
Johannes Berg04ecd252012-09-11 14:34:12 +02001838
Luciano Coelho71965c12014-02-18 17:07:53 +02001839 ieee80211_queue_work(&local->hw, &sdata->work);
Johannes Bergaf8cdcd2009-04-19 21:25:43 +02001840
1841 return 0;
1842}
1843
1844int ieee80211_ibss_leave(struct ieee80211_sub_if_data *sdata)
1845{
Teemu Paasikivi5ea096c2010-06-14 12:55:33 +03001846 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
Johannes Berg7a17a332010-07-21 11:30:27 +02001847
Simon Wunderlich871a4182013-08-28 13:41:30 +02001848 ieee80211_ibss_disconnect(sdata);
Simon Wunderlichb78a4932012-11-13 18:43:03 +01001849 ifibss->ssid_len = 0;
Joe Perchesc84a67a2015-03-02 19:54:57 -08001850 eth_zero_addr(ifibss->bssid);
Johannes Bergaf8cdcd2009-04-19 21:25:43 +02001851
1852 /* remove beacon */
1853 kfree(sdata->u.ibss.ie);
Simon Wunderlich822854b2013-06-28 10:39:59 +02001854
1855 /* on the next join, re-program HT parameters */
1856 memset(&ifibss->ht_capa, 0, sizeof(ifibss->ht_capa));
1857 memset(&ifibss->ht_capa_mask, 0, sizeof(ifibss->ht_capa_mask));
1858
Johannes Bergaf8cdcd2009-04-19 21:25:43 +02001859 synchronize_rcu();
Johannes Bergaf8cdcd2009-04-19 21:25:43 +02001860
Johannes Berg35f20c12010-06-10 10:21:30 +02001861 skb_queue_purge(&sdata->skb_queue);
Johannes Berg5cff20e2009-04-29 12:26:17 +02001862
Johannes Bergbc05d192010-07-21 10:52:40 +02001863 del_timer_sync(&sdata->u.ibss.timer);
Johannes Berg7a17a332010-07-21 11:30:27 +02001864
Johannes Bergaf8cdcd2009-04-19 21:25:43 +02001865 return 0;
1866}