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Commit | Line | Data |
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46900298 JB |
1 | /* |
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> | |
9 | * | |
10 | * This program is free software; you can redistribute it and/or modify | |
11 | * it under the terms of the GNU General Public License version 2 as | |
12 | * published by the Free Software Foundation. | |
13 | */ | |
14 | ||
15 | #include <linux/delay.h> | |
5a0e3ad6 | 16 | #include <linux/slab.h> |
46900298 JB |
17 | #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> | |
46900298 JB |
23 | |
24 | #include "ieee80211_i.h" | |
24487981 | 25 | #include "driver-ops.h" |
46900298 JB |
26 | #include "rate.h" |
27 | ||
28 | #define IEEE80211_SCAN_INTERVAL (2 * HZ) | |
46900298 JB |
29 | #define IEEE80211_IBSS_JOIN_TIMEOUT (7 * HZ) |
30 | ||
31 | #define IEEE80211_IBSS_MERGE_INTERVAL (30 * HZ) | |
32 | #define IEEE80211_IBSS_INACTIVITY_LIMIT (60 * HZ) | |
dad9defd | 33 | #define IEEE80211_IBSS_RSN_INACTIVITY_LIMIT (10 * HZ) |
46900298 JB |
34 | |
35 | #define IEEE80211_IBSS_MAX_STA_ENTRIES 128 | |
36 | ||
d51b70ff SW |
37 | static struct beacon_data * |
38 | ieee80211_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, | |
cd7760e6 SW |
42 | bool *have_higher_than_11mbit, |
43 | struct cfg80211_csa_settings *csa_settings) | |
46900298 JB |
44 | { |
45 | struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; | |
46 | struct ieee80211_local *local = sdata->local; | |
2103dec1 | 47 | int rates_n = 0, i, ri; |
46900298 JB |
48 | struct ieee80211_mgmt *mgmt; |
49 | u8 *pos; | |
50 | struct ieee80211_supported_band *sband; | |
d51b70ff | 51 | u32 rate_flags, rates = 0, rates_added = 0; |
c3ffeab4 JB |
52 | struct beacon_data *presp; |
53 | int frame_len; | |
2103dec1 | 54 | int shift; |
24487981 | 55 | |
46900298 | 56 | /* Build IBSS probe response */ |
c3ffeab4 JB |
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 */ + | |
cd7760e6 | 63 | 5 /* Channel Switch Announcement */ + |
c3ffeab4 JB |
64 | 2 + (IEEE80211_MAX_SUPP_RATES - 8) + |
65 | 2 + sizeof(struct ieee80211_ht_cap) + | |
66 | 2 + sizeof(struct ieee80211_ht_operation) + | |
67 | ifibss->ie_len; | |
68 | presp = kzalloc(sizeof(*presp) + frame_len, GFP_KERNEL); | |
69 | if (!presp) | |
d51b70ff | 70 | return NULL; |
c3ffeab4 JB |
71 | |
72 | presp->head = (void *)(presp + 1); | |
73 | ||
74 | mgmt = (void *) presp->head; | |
46900298 JB |
75 | mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | |
76 | IEEE80211_STYPE_PROBE_RESP); | |
e83e6541 | 77 | eth_broadcast_addr(mgmt->da); |
47846c9b | 78 | memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN); |
46900298 | 79 | memcpy(mgmt->bssid, ifibss->bssid, ETH_ALEN); |
57c4d7b4 | 80 | mgmt->u.beacon.beacon_int = cpu_to_le16(beacon_int); |
707c1b4e | 81 | mgmt->u.beacon.timestamp = cpu_to_le64(tsf); |
46900298 JB |
82 | mgmt->u.beacon.capab_info = cpu_to_le16(capability); |
83 | ||
c3ffeab4 JB |
84 | pos = (u8 *)mgmt + offsetof(struct ieee80211_mgmt, u.beacon.variable); |
85 | ||
46900298 JB |
86 | *pos++ = WLAN_EID_SSID; |
87 | *pos++ = ifibss->ssid_len; | |
88 | memcpy(pos, ifibss->ssid, ifibss->ssid_len); | |
c3ffeab4 | 89 | pos += ifibss->ssid_len; |
46900298 | 90 | |
d51b70ff SW |
91 | sband = local->hw.wiphy->bands[chandef->chan->band]; |
92 | rate_flags = ieee80211_chandef_rate_flags(chandef); | |
93 | shift = ieee80211_chandef_get_shift(chandef); | |
94 | rates_n = 0; | |
95 | if (have_higher_than_11mbit) | |
96 | *have_higher_than_11mbit = false; | |
97 | ||
2103dec1 SW |
98 | for (i = 0; i < sband->n_bitrates; i++) { |
99 | if ((rate_flags & sband->bitrates[i].flags) != rate_flags) | |
100 | continue; | |
d51b70ff SW |
101 | if (sband->bitrates[i].bitrate > 110 && |
102 | have_higher_than_11mbit) | |
103 | *have_higher_than_11mbit = true; | |
2103dec1 SW |
104 | |
105 | rates |= BIT(i); | |
106 | rates_n++; | |
107 | } | |
108 | ||
46900298 | 109 | *pos++ = WLAN_EID_SUPP_RATES; |
2103dec1 SW |
110 | *pos++ = min_t(int, 8, rates_n); |
111 | for (ri = 0; ri < sband->n_bitrates; ri++) { | |
112 | int rate = DIV_ROUND_UP(sband->bitrates[ri].bitrate, | |
113 | 5 * (1 << shift)); | |
c3ffeab4 | 114 | u8 basic = 0; |
2103dec1 SW |
115 | if (!(rates & BIT(ri))) |
116 | continue; | |
117 | ||
118 | if (basic_rates & BIT(ri)) | |
c3ffeab4 | 119 | basic = 0x80; |
2103dec1 | 120 | *pos++ = basic | (u8) rate; |
93c75786 SW |
121 | if (++rates_added == 8) { |
122 | ri++; /* continue at next rate for EXT_SUPP_RATES */ | |
2103dec1 | 123 | break; |
93c75786 | 124 | } |
c3ffeab4 | 125 | } |
46900298 JB |
126 | |
127 | if (sband->band == IEEE80211_BAND_2GHZ) { | |
46900298 JB |
128 | *pos++ = WLAN_EID_DS_PARAMS; |
129 | *pos++ = 1; | |
d51b70ff SW |
130 | *pos++ = ieee80211_frequency_to_channel( |
131 | chandef->chan->center_freq); | |
46900298 JB |
132 | } |
133 | ||
46900298 JB |
134 | *pos++ = WLAN_EID_IBSS_PARAMS; |
135 | *pos++ = 2; | |
136 | /* FIX: set ATIM window based on scan results */ | |
137 | *pos++ = 0; | |
138 | *pos++ = 0; | |
139 | ||
cd7760e6 SW |
140 | if (csa_settings) { |
141 | *pos++ = WLAN_EID_CHANNEL_SWITCH; | |
142 | *pos++ = 3; | |
143 | *pos++ = csa_settings->block_tx ? 1 : 0; | |
144 | *pos++ = ieee80211_frequency_to_channel( | |
145 | csa_settings->chandef.chan->center_freq); | |
146 | sdata->csa_counter_offset_beacon = (pos - presp->head); | |
147 | *pos++ = csa_settings->count; | |
148 | } | |
149 | ||
2103dec1 SW |
150 | /* put the remaining rates in WLAN_EID_EXT_SUPP_RATES */ |
151 | if (rates_n > 8) { | |
46900298 | 152 | *pos++ = WLAN_EID_EXT_SUPP_RATES; |
2103dec1 SW |
153 | *pos++ = rates_n - 8; |
154 | for (; ri < sband->n_bitrates; ri++) { | |
155 | int rate = DIV_ROUND_UP(sband->bitrates[ri].bitrate, | |
156 | 5 * (1 << shift)); | |
c3ffeab4 | 157 | u8 basic = 0; |
2103dec1 SW |
158 | if (!(rates & BIT(ri))) |
159 | continue; | |
160 | ||
161 | if (basic_rates & BIT(ri)) | |
c3ffeab4 | 162 | basic = 0x80; |
2103dec1 | 163 | *pos++ = basic | (u8) rate; |
c3ffeab4 | 164 | } |
46900298 JB |
165 | } |
166 | ||
c3ffeab4 JB |
167 | if (ifibss->ie_len) { |
168 | memcpy(pos, ifibss->ie, ifibss->ie_len); | |
169 | pos += ifibss->ie_len; | |
170 | } | |
af8cdcd8 | 171 | |
13c40c54 | 172 | /* add HT capability and information IEs */ |
d51b70ff SW |
173 | if (chandef->width != NL80211_CHAN_WIDTH_20_NOHT && |
174 | chandef->width != NL80211_CHAN_WIDTH_5 && | |
175 | chandef->width != NL80211_CHAN_WIDTH_10 && | |
683b6d3b | 176 | sband->ht_cap.ht_supported) { |
822854b0 SW |
177 | struct ieee80211_sta_ht_cap ht_cap; |
178 | ||
179 | memcpy(&ht_cap, &sband->ht_cap, sizeof(ht_cap)); | |
180 | ieee80211_apply_htcap_overrides(sdata, &ht_cap); | |
181 | ||
182 | pos = ieee80211_ie_build_ht_cap(pos, &ht_cap, ht_cap.cap); | |
0d894ec5 AN |
183 | /* |
184 | * Note: According to 802.11n-2009 9.13.3.1, HT Protection | |
185 | * field and RIFS Mode are reserved in IBSS mode, therefore | |
186 | * keep them at 0 | |
187 | */ | |
074d46d1 | 188 | pos = ieee80211_ie_build_ht_oper(pos, &sband->ht_cap, |
d51b70ff | 189 | chandef, 0); |
13c40c54 AS |
190 | } |
191 | ||
32c5057b | 192 | if (local->hw.queues >= IEEE80211_NUM_ACS) { |
9eba6125 BR |
193 | *pos++ = WLAN_EID_VENDOR_SPECIFIC; |
194 | *pos++ = 7; /* len */ | |
195 | *pos++ = 0x00; /* Microsoft OUI 00:50:F2 */ | |
196 | *pos++ = 0x50; | |
197 | *pos++ = 0xf2; | |
198 | *pos++ = 2; /* WME */ | |
199 | *pos++ = 0; /* WME info */ | |
200 | *pos++ = 1; /* WME ver */ | |
201 | *pos++ = 0; /* U-APSD no in use */ | |
202 | } | |
203 | ||
c3ffeab4 JB |
204 | presp->head_len = pos - presp->head; |
205 | if (WARN_ON(presp->head_len > frame_len)) | |
d51b70ff SW |
206 | goto error; |
207 | ||
208 | return presp; | |
209 | error: | |
210 | kfree(presp); | |
211 | return NULL; | |
212 | } | |
213 | ||
214 | static void __ieee80211_sta_join_ibss(struct ieee80211_sub_if_data *sdata, | |
215 | const u8 *bssid, const int beacon_int, | |
b35c8097 | 216 | struct cfg80211_chan_def *req_chandef, |
d51b70ff SW |
217 | const u32 basic_rates, |
218 | const u16 capability, u64 tsf, | |
219 | bool creator) | |
220 | { | |
221 | struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; | |
222 | struct ieee80211_local *local = sdata->local; | |
d51b70ff SW |
223 | struct ieee80211_mgmt *mgmt; |
224 | struct cfg80211_bss *bss; | |
225 | u32 bss_change; | |
226 | struct cfg80211_chan_def chandef; | |
b35c8097 | 227 | struct ieee80211_channel *chan; |
d51b70ff SW |
228 | struct beacon_data *presp; |
229 | enum nl80211_bss_scan_width scan_width; | |
230 | bool have_higher_than_11mbit; | |
8e8d347d | 231 | bool radar_required = false; |
55fff501 | 232 | int err; |
d51b70ff SW |
233 | |
234 | sdata_assert_lock(sdata); | |
235 | ||
236 | /* Reset own TSF to allow time synchronization work. */ | |
237 | drv_reset_tsf(local, sdata); | |
238 | ||
239 | if (!ether_addr_equal(ifibss->bssid, bssid)) | |
240 | sta_info_flush(sdata); | |
241 | ||
242 | /* if merging, indicate to driver that we leave the old IBSS */ | |
243 | if (sdata->vif.bss_conf.ibss_joined) { | |
244 | sdata->vif.bss_conf.ibss_joined = false; | |
245 | sdata->vif.bss_conf.ibss_creator = false; | |
246 | sdata->vif.bss_conf.enable_beacon = false; | |
247 | netif_carrier_off(sdata->dev); | |
248 | ieee80211_bss_info_change_notify(sdata, | |
249 | BSS_CHANGED_IBSS | | |
250 | BSS_CHANGED_BEACON_ENABLED); | |
55fff501 | 251 | drv_leave_ibss(local, sdata); |
d51b70ff SW |
252 | } |
253 | ||
254 | presp = rcu_dereference_protected(ifibss->presp, | |
255 | lockdep_is_held(&sdata->wdev.mtx)); | |
256 | rcu_assign_pointer(ifibss->presp, NULL); | |
257 | if (presp) | |
258 | kfree_rcu(presp, rcu_head); | |
259 | ||
260 | sdata->drop_unencrypted = capability & WLAN_CAPABILITY_PRIVACY ? 1 : 0; | |
261 | ||
b35c8097 JL |
262 | /* make a copy of the chandef, it could be modified below. */ |
263 | chandef = *req_chandef; | |
264 | chan = chandef.chan; | |
d51b70ff SW |
265 | if (!cfg80211_reg_can_beacon(local->hw.wiphy, &chandef)) { |
266 | if (chandef.width == NL80211_CHAN_WIDTH_5 || | |
267 | chandef.width == NL80211_CHAN_WIDTH_10 || | |
268 | chandef.width == NL80211_CHAN_WIDTH_20_NOHT || | |
269 | chandef.width == NL80211_CHAN_WIDTH_20) { | |
270 | sdata_info(sdata, | |
271 | "Failed to join IBSS, beacons forbidden\n"); | |
272 | return; | |
273 | } | |
274 | chandef.width = NL80211_CHAN_WIDTH_20; | |
275 | chandef.center_freq1 = chan->center_freq; | |
8e8d347d SW |
276 | /* check again for downgraded chandef */ |
277 | if (!cfg80211_reg_can_beacon(local->hw.wiphy, &chandef)) { | |
278 | sdata_info(sdata, | |
279 | "Failed to join IBSS, beacons forbidden\n"); | |
280 | return; | |
281 | } | |
282 | } | |
283 | ||
284 | err = cfg80211_chandef_dfs_required(sdata->local->hw.wiphy, | |
285 | &chandef); | |
6658ab80 LC |
286 | if (err < 0) { |
287 | sdata_info(sdata, | |
288 | "Failed to join IBSS, invalid chandef\n"); | |
289 | return; | |
290 | } | |
8e8d347d SW |
291 | if (err > 0) { |
292 | if (!ifibss->userspace_handles_dfs) { | |
293 | sdata_info(sdata, | |
294 | "Failed to join IBSS, DFS channel without control program\n"); | |
295 | return; | |
296 | } | |
297 | radar_required = true; | |
d51b70ff SW |
298 | } |
299 | ||
34a3740d | 300 | mutex_lock(&local->mtx); |
d51b70ff SW |
301 | if (ieee80211_vif_use_channel(sdata, &chandef, |
302 | ifibss->fixed_channel ? | |
303 | IEEE80211_CHANCTX_SHARED : | |
304 | IEEE80211_CHANCTX_EXCLUSIVE)) { | |
305 | sdata_info(sdata, "Failed to join IBSS, no channel context\n"); | |
34a3740d | 306 | mutex_unlock(&local->mtx); |
d51b70ff SW |
307 | return; |
308 | } | |
cc901de1 | 309 | sdata->radar_required = radar_required; |
34a3740d | 310 | mutex_unlock(&local->mtx); |
d51b70ff SW |
311 | |
312 | memcpy(ifibss->bssid, bssid, ETH_ALEN); | |
313 | ||
d51b70ff SW |
314 | presp = ieee80211_ibss_build_presp(sdata, beacon_int, basic_rates, |
315 | capability, tsf, &chandef, | |
cd7760e6 | 316 | &have_higher_than_11mbit, NULL); |
d51b70ff | 317 | if (!presp) |
c3ffeab4 JB |
318 | return; |
319 | ||
320 | rcu_assign_pointer(ifibss->presp, presp); | |
d51b70ff | 321 | mgmt = (void *)presp->head; |
46900298 | 322 | |
d6a83228 | 323 | sdata->vif.bss_conf.enable_beacon = true; |
2d0ddec5 | 324 | sdata->vif.bss_conf.beacon_int = beacon_int; |
fbd2c8dc | 325 | sdata->vif.bss_conf.basic_rates = basic_rates; |
0ca54f6c MP |
326 | sdata->vif.bss_conf.ssid_len = ifibss->ssid_len; |
327 | memcpy(sdata->vif.bss_conf.ssid, ifibss->ssid, ifibss->ssid_len); | |
2d0ddec5 JB |
328 | bss_change = BSS_CHANGED_BEACON_INT; |
329 | bss_change |= ieee80211_reset_erp_info(sdata); | |
330 | bss_change |= BSS_CHANGED_BSSID; | |
331 | bss_change |= BSS_CHANGED_BEACON; | |
332 | bss_change |= BSS_CHANGED_BEACON_ENABLED; | |
392cfdb1 | 333 | bss_change |= BSS_CHANGED_BASIC_RATES; |
13c40c54 | 334 | bss_change |= BSS_CHANGED_HT; |
8fc214ba | 335 | bss_change |= BSS_CHANGED_IBSS; |
0ca54f6c | 336 | bss_change |= BSS_CHANGED_SSID; |
2f91a967 SW |
337 | |
338 | /* | |
339 | * In 5 GHz/802.11a, we can always use short slot time. | |
340 | * (IEEE 802.11-2012 18.3.8.7) | |
341 | * | |
342 | * In 2.4GHz, we must always use long slots in IBSS for compatibility | |
343 | * reasons. | |
344 | * (IEEE 802.11-2012 19.4.5) | |
345 | * | |
346 | * HT follows these specifications (IEEE 802.11-2012 20.3.18) | |
347 | */ | |
348 | sdata->vif.bss_conf.use_short_slot = chan->band == IEEE80211_BAND_5GHZ; | |
349 | bss_change |= BSS_CHANGED_ERP_SLOT; | |
350 | ||
2ec9c1f6 SW |
351 | /* cf. IEEE 802.11 9.2.12 */ |
352 | if (chan->band == IEEE80211_BAND_2GHZ && have_higher_than_11mbit) | |
353 | sdata->flags |= IEEE80211_SDATA_OPERATING_GMODE; | |
354 | else | |
355 | sdata->flags &= ~IEEE80211_SDATA_OPERATING_GMODE; | |
356 | ||
55fff501 JB |
357 | ieee80211_set_wmm_default(sdata, true); |
358 | ||
8fc214ba | 359 | sdata->vif.bss_conf.ibss_joined = true; |
c13a765b | 360 | sdata->vif.bss_conf.ibss_creator = creator; |
46900298 | 361 | |
55fff501 JB |
362 | err = drv_join_ibss(local, sdata); |
363 | if (err) { | |
364 | sdata->vif.bss_conf.ibss_joined = false; | |
365 | sdata->vif.bss_conf.ibss_creator = false; | |
366 | sdata->vif.bss_conf.enable_beacon = false; | |
367 | sdata->vif.bss_conf.ssid_len = 0; | |
368 | RCU_INIT_POINTER(ifibss->presp, NULL); | |
369 | kfree_rcu(presp, rcu_head); | |
34a3740d | 370 | mutex_lock(&local->mtx); |
55fff501 | 371 | ieee80211_vif_release_channel(sdata); |
34a3740d | 372 | mutex_unlock(&local->mtx); |
55fff501 JB |
373 | sdata_info(sdata, "Failed to join IBSS, driver failure: %d\n", |
374 | err); | |
375 | return; | |
376 | } | |
377 | ||
378 | ieee80211_bss_info_change_notify(sdata, bss_change); | |
46900298 | 379 | |
46900298 | 380 | ifibss->state = IEEE80211_IBSS_MLME_JOINED; |
af8cdcd8 JB |
381 | mod_timer(&ifibss->timer, |
382 | round_jiffies(jiffies + IEEE80211_IBSS_MERGE_INTERVAL)); | |
46900298 | 383 | |
7ca15a0a SW |
384 | scan_width = cfg80211_chandef_to_scan_width(&chandef); |
385 | bss = cfg80211_inform_bss_width_frame(local->hw.wiphy, chan, | |
386 | scan_width, mgmt, | |
387 | presp->head_len, 0, GFP_KERNEL); | |
5b112d3d | 388 | cfg80211_put_bss(local->hw.wiphy, bss); |
86a2ea41 | 389 | netif_carrier_on(sdata->dev); |
fe94f3a4 | 390 | cfg80211_ibss_joined(sdata->dev, ifibss->bssid, chan, GFP_KERNEL); |
46900298 JB |
391 | } |
392 | ||
af8cdcd8 JB |
393 | static void ieee80211_sta_join_ibss(struct ieee80211_sub_if_data *sdata, |
394 | struct ieee80211_bss *bss) | |
46900298 | 395 | { |
0c1ad2ca JB |
396 | struct cfg80211_bss *cbss = |
397 | container_of((void *)bss, struct cfg80211_bss, priv); | |
b59066a2 | 398 | struct ieee80211_supported_band *sband; |
75a423f4 | 399 | struct cfg80211_chan_def chandef; |
b59066a2 JB |
400 | u32 basic_rates; |
401 | int i, j; | |
0c1ad2ca | 402 | u16 beacon_int = cbss->beacon_interval; |
8cef2c9d | 403 | const struct cfg80211_bss_ies *ies; |
75a423f4 | 404 | enum nl80211_channel_type chan_type; |
8cef2c9d | 405 | u64 tsf; |
2103dec1 SW |
406 | u32 rate_flags; |
407 | int shift; | |
57c4d7b4 | 408 | |
8d61ffa5 | 409 | sdata_assert_lock(sdata); |
7a17a33c | 410 | |
57c4d7b4 JB |
411 | if (beacon_int < 10) |
412 | beacon_int = 10; | |
413 | ||
75a423f4 SW |
414 | switch (sdata->u.ibss.chandef.width) { |
415 | case NL80211_CHAN_WIDTH_20_NOHT: | |
416 | case NL80211_CHAN_WIDTH_20: | |
417 | case NL80211_CHAN_WIDTH_40: | |
418 | chan_type = cfg80211_get_chandef_type(&sdata->u.ibss.chandef); | |
419 | cfg80211_chandef_create(&chandef, cbss->channel, chan_type); | |
420 | break; | |
421 | case NL80211_CHAN_WIDTH_5: | |
422 | case NL80211_CHAN_WIDTH_10: | |
423 | cfg80211_chandef_create(&chandef, cbss->channel, | |
424 | NL80211_CHAN_WIDTH_20_NOHT); | |
425 | chandef.width = sdata->u.ibss.chandef.width; | |
426 | break; | |
427 | default: | |
428 | /* fall back to 20 MHz for unsupported modes */ | |
429 | cfg80211_chandef_create(&chandef, cbss->channel, | |
430 | NL80211_CHAN_WIDTH_20_NOHT); | |
431 | break; | |
432 | } | |
433 | ||
0c1ad2ca | 434 | sband = sdata->local->hw.wiphy->bands[cbss->channel->band]; |
2103dec1 SW |
435 | rate_flags = ieee80211_chandef_rate_flags(&sdata->u.ibss.chandef); |
436 | shift = ieee80211_vif_get_shift(&sdata->vif); | |
b59066a2 JB |
437 | |
438 | basic_rates = 0; | |
439 | ||
440 | for (i = 0; i < bss->supp_rates_len; i++) { | |
2103dec1 | 441 | int rate = bss->supp_rates[i] & 0x7f; |
b59066a2 JB |
442 | bool is_basic = !!(bss->supp_rates[i] & 0x80); |
443 | ||
444 | for (j = 0; j < sband->n_bitrates; j++) { | |
2103dec1 SW |
445 | int brate; |
446 | if ((rate_flags & sband->bitrates[j].flags) | |
447 | != rate_flags) | |
448 | continue; | |
449 | ||
450 | brate = DIV_ROUND_UP(sband->bitrates[j].bitrate, | |
451 | 5 * (1 << shift)); | |
452 | if (brate == rate) { | |
b59066a2 JB |
453 | if (is_basic) |
454 | basic_rates |= BIT(j); | |
455 | break; | |
456 | } | |
457 | } | |
458 | } | |
459 | ||
8cef2c9d JB |
460 | rcu_read_lock(); |
461 | ies = rcu_dereference(cbss->ies); | |
462 | tsf = ies->tsf; | |
463 | rcu_read_unlock(); | |
464 | ||
0c1ad2ca | 465 | __ieee80211_sta_join_ibss(sdata, cbss->bssid, |
57c4d7b4 | 466 | beacon_int, |
75a423f4 | 467 | &chandef, |
b59066a2 | 468 | basic_rates, |
0c1ad2ca | 469 | cbss->capability, |
8cef2c9d | 470 | tsf, false); |
46900298 JB |
471 | } |
472 | ||
cd7760e6 SW |
473 | int ieee80211_ibss_csa_beacon(struct ieee80211_sub_if_data *sdata, |
474 | struct cfg80211_csa_settings *csa_settings) | |
475 | { | |
476 | struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; | |
477 | struct beacon_data *presp, *old_presp; | |
478 | struct cfg80211_bss *cbss; | |
479 | const struct cfg80211_bss_ies *ies; | |
480 | u16 capability; | |
481 | u64 tsf; | |
482 | int ret = 0; | |
483 | ||
484 | sdata_assert_lock(sdata); | |
485 | ||
486 | capability = WLAN_CAPABILITY_IBSS; | |
487 | ||
488 | if (ifibss->privacy) | |
489 | capability |= WLAN_CAPABILITY_PRIVACY; | |
490 | ||
491 | cbss = cfg80211_get_bss(sdata->local->hw.wiphy, ifibss->chandef.chan, | |
492 | ifibss->bssid, ifibss->ssid, | |
493 | ifibss->ssid_len, WLAN_CAPABILITY_IBSS | | |
494 | WLAN_CAPABILITY_PRIVACY, | |
495 | capability); | |
496 | ||
497 | if (WARN_ON(!cbss)) { | |
498 | ret = -EINVAL; | |
499 | goto out; | |
500 | } | |
501 | ||
502 | rcu_read_lock(); | |
503 | ies = rcu_dereference(cbss->ies); | |
504 | tsf = ies->tsf; | |
505 | rcu_read_unlock(); | |
506 | cfg80211_put_bss(sdata->local->hw.wiphy, cbss); | |
507 | ||
508 | old_presp = rcu_dereference_protected(ifibss->presp, | |
509 | lockdep_is_held(&sdata->wdev.mtx)); | |
510 | ||
511 | presp = ieee80211_ibss_build_presp(sdata, | |
512 | sdata->vif.bss_conf.beacon_int, | |
513 | sdata->vif.bss_conf.basic_rates, | |
514 | capability, tsf, &ifibss->chandef, | |
515 | NULL, csa_settings); | |
516 | if (!presp) { | |
517 | ret = -ENOMEM; | |
518 | goto out; | |
519 | } | |
520 | ||
521 | rcu_assign_pointer(ifibss->presp, presp); | |
522 | if (old_presp) | |
523 | kfree_rcu(old_presp, rcu_head); | |
524 | ||
dddd586b | 525 | return BSS_CHANGED_BEACON; |
cd7760e6 SW |
526 | out: |
527 | return ret; | |
528 | } | |
529 | ||
530 | int 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; | |
faf046e7 | 534 | int err, changed = 0; |
cd7760e6 SW |
535 | u16 capability; |
536 | ||
bafdc614 SW |
537 | sdata_assert_lock(sdata); |
538 | ||
cd7760e6 SW |
539 | /* update cfg80211 bss information with the new channel */ |
540 | if (!is_zero_ether_addr(ifibss->bssid)) { | |
541 | capability = WLAN_CAPABILITY_IBSS; | |
542 | ||
543 | if (ifibss->privacy) | |
544 | capability |= WLAN_CAPABILITY_PRIVACY; | |
545 | ||
546 | cbss = cfg80211_get_bss(sdata->local->hw.wiphy, | |
547 | ifibss->chandef.chan, | |
548 | ifibss->bssid, ifibss->ssid, | |
549 | ifibss->ssid_len, WLAN_CAPABILITY_IBSS | | |
550 | WLAN_CAPABILITY_PRIVACY, | |
551 | capability); | |
552 | /* XXX: should not really modify cfg80211 data */ | |
553 | if (cbss) { | |
33787fc4 | 554 | cbss->channel = sdata->csa_chandef.chan; |
cd7760e6 SW |
555 | cfg80211_put_bss(sdata->local->hw.wiphy, cbss); |
556 | } | |
557 | } | |
558 | ||
33787fc4 | 559 | ifibss->chandef = sdata->csa_chandef; |
cd7760e6 SW |
560 | |
561 | /* generate the beacon */ | |
562 | err = ieee80211_ibss_csa_beacon(sdata, NULL); | |
cd7760e6 SW |
563 | if (err < 0) |
564 | return err; | |
565 | ||
faf046e7 | 566 | changed |= err; |
dddd586b | 567 | |
faf046e7 | 568 | return changed; |
cd7760e6 SW |
569 | } |
570 | ||
571 | void 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 | ||
52874a5e | 578 | static struct sta_info *ieee80211_ibss_finish_sta(struct sta_info *sta) |
8bf11d8d JB |
579 | __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 | ||
bdcbd8e0 | 586 | ibss_dbg(sdata, "Adding new IBSS station %pM\n", addr); |
8bf11d8d | 587 | |
83d5cc01 JB |
588 | sta_info_pre_move_state(sta, IEEE80211_STA_AUTH); |
589 | sta_info_pre_move_state(sta, IEEE80211_STA_ASSOC); | |
267335d6 AQ |
590 | /* 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); | |
8bf11d8d JB |
594 | |
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 | ||
603 | static struct sta_info * | |
52874a5e AQ |
604 | ieee80211_ibss_add_sta(struct ieee80211_sub_if_data *sdata, const u8 *bssid, |
605 | const u8 *addr, u32 supp_rates) | |
8bf11d8d JB |
606 | __acquires(RCU) |
607 | { | |
608 | struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; | |
609 | struct ieee80211_local *local = sdata->local; | |
610 | struct sta_info *sta; | |
55de908a | 611 | struct ieee80211_chanctx_conf *chanctx_conf; |
b422c6cd | 612 | struct ieee80211_supported_band *sband; |
74608aca | 613 | enum nl80211_bss_scan_width scan_width; |
55de908a | 614 | int band; |
8bf11d8d JB |
615 | |
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) { | |
bdcbd8e0 | 621 | net_info_ratelimited("%s: No room for a new IBSS STA entry %pM\n", |
e87cc472 | 622 | sdata->name, addr); |
8bf11d8d JB |
623 | 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 | ||
b203ca39 | 632 | if (!ether_addr_equal(bssid, sdata->u.ibss.bssid)) { |
8bf11d8d JB |
633 | rcu_read_lock(); |
634 | return NULL; | |
635 | } | |
636 | ||
55de908a JB |
637 | rcu_read_lock(); |
638 | chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); | |
639 | if (WARN_ON_ONCE(!chanctx_conf)) | |
640 | return NULL; | |
4bf88530 | 641 | band = chanctx_conf->def.chan->band; |
74608aca | 642 | scan_width = cfg80211_chandef_to_scan_width(&chanctx_conf->def); |
55de908a JB |
643 | rcu_read_unlock(); |
644 | ||
8bf11d8d JB |
645 | sta = sta_info_alloc(sdata, addr, GFP_KERNEL); |
646 | if (!sta) { | |
647 | rcu_read_lock(); | |
648 | return NULL; | |
649 | } | |
650 | ||
651 | sta->last_rx = jiffies; | |
652 | ||
653 | /* make sure mandatory rates are always added */ | |
b422c6cd | 654 | sband = local->hw.wiphy->bands[band]; |
8bf11d8d | 655 | sta->sta.supp_rates[band] = supp_rates | |
74608aca | 656 | ieee80211_mandatory_rates(sband, scan_width); |
8bf11d8d | 657 | |
52874a5e | 658 | return ieee80211_ibss_finish_sta(sta); |
6d810f10 AQ |
659 | } |
660 | ||
871a4180 SW |
661 | static 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 && | |
673 | time_after(sta->last_rx + IEEE80211_IBSS_MERGE_INTERVAL, | |
674 | jiffies)) { | |
675 | active++; | |
676 | break; | |
677 | } | |
678 | } | |
679 | ||
680 | rcu_read_unlock(); | |
681 | ||
682 | return active; | |
683 | } | |
684 | ||
685 | static void ieee80211_ibss_disconnect(struct ieee80211_sub_if_data *sdata) | |
686 | { | |
687 | struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; | |
688 | struct ieee80211_local *local = sdata->local; | |
689 | struct cfg80211_bss *cbss; | |
690 | struct beacon_data *presp; | |
691 | struct sta_info *sta; | |
871a4180 SW |
692 | u16 capability; |
693 | ||
d4c80d9d | 694 | if (!is_zero_ether_addr(ifibss->bssid)) { |
871a4180 SW |
695 | capability = WLAN_CAPABILITY_IBSS; |
696 | ||
697 | if (ifibss->privacy) | |
698 | capability |= WLAN_CAPABILITY_PRIVACY; | |
699 | ||
700 | cbss = cfg80211_get_bss(local->hw.wiphy, ifibss->chandef.chan, | |
701 | ifibss->bssid, ifibss->ssid, | |
702 | ifibss->ssid_len, WLAN_CAPABILITY_IBSS | | |
703 | WLAN_CAPABILITY_PRIVACY, | |
704 | capability); | |
705 | ||
706 | if (cbss) { | |
707 | cfg80211_unlink_bss(local->hw.wiphy, cbss); | |
708 | cfg80211_put_bss(sdata->local->hw.wiphy, cbss); | |
709 | } | |
710 | } | |
711 | ||
712 | ifibss->state = IEEE80211_IBSS_MLME_SEARCH; | |
713 | ||
714 | sta_info_flush(sdata); | |
715 | ||
716 | spin_lock_bh(&ifibss->incomplete_lock); | |
717 | while (!list_empty(&ifibss->incomplete_stations)) { | |
718 | sta = list_first_entry(&ifibss->incomplete_stations, | |
719 | struct sta_info, list); | |
720 | list_del(&sta->list); | |
721 | spin_unlock_bh(&ifibss->incomplete_lock); | |
722 | ||
723 | sta_info_free(local, sta); | |
724 | spin_lock_bh(&ifibss->incomplete_lock); | |
725 | } | |
726 | spin_unlock_bh(&ifibss->incomplete_lock); | |
727 | ||
728 | netif_carrier_off(sdata->dev); | |
729 | ||
730 | sdata->vif.bss_conf.ibss_joined = false; | |
731 | sdata->vif.bss_conf.ibss_creator = false; | |
732 | sdata->vif.bss_conf.enable_beacon = false; | |
733 | sdata->vif.bss_conf.ssid_len = 0; | |
734 | ||
735 | /* remove beacon */ | |
736 | presp = rcu_dereference_protected(ifibss->presp, | |
737 | lockdep_is_held(&sdata->wdev.mtx)); | |
738 | RCU_INIT_POINTER(sdata->u.ibss.presp, NULL); | |
739 | if (presp) | |
740 | kfree_rcu(presp, rcu_head); | |
741 | ||
742 | clear_bit(SDATA_STATE_OFFCHANNEL_BEACON_STOPPED, &sdata->state); | |
743 | ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BEACON_ENABLED | | |
744 | BSS_CHANGED_IBSS); | |
55fff501 | 745 | drv_leave_ibss(local, sdata); |
34a3740d | 746 | mutex_lock(&local->mtx); |
871a4180 | 747 | ieee80211_vif_release_channel(sdata); |
34a3740d | 748 | mutex_unlock(&local->mtx); |
871a4180 SW |
749 | } |
750 | ||
cd7760e6 SW |
751 | static void ieee80211_csa_connection_drop_work(struct work_struct *work) |
752 | { | |
753 | struct ieee80211_sub_if_data *sdata = | |
754 | container_of(work, struct ieee80211_sub_if_data, | |
755 | u.ibss.csa_connection_drop_work); | |
756 | ||
6f07d216 LC |
757 | sdata_lock(sdata); |
758 | ||
cd7760e6 SW |
759 | ieee80211_ibss_disconnect(sdata); |
760 | synchronize_rcu(); | |
761 | skb_queue_purge(&sdata->skb_queue); | |
762 | ||
763 | /* trigger a scan to find another IBSS network to join */ | |
764 | ieee80211_queue_work(&sdata->local->hw, &sdata->work); | |
6f07d216 LC |
765 | |
766 | sdata_unlock(sdata); | |
cd7760e6 SW |
767 | } |
768 | ||
8e8d347d SW |
769 | static void ieee80211_ibss_csa_mark_radar(struct ieee80211_sub_if_data *sdata) |
770 | { | |
771 | struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; | |
772 | int err; | |
773 | ||
774 | /* if the current channel is a DFS channel, mark the channel as | |
775 | * unavailable. | |
776 | */ | |
777 | err = cfg80211_chandef_dfs_required(sdata->local->hw.wiphy, | |
778 | &ifibss->chandef); | |
779 | if (err > 0) | |
780 | cfg80211_radar_event(sdata->local->hw.wiphy, &ifibss->chandef, | |
781 | GFP_ATOMIC); | |
782 | } | |
783 | ||
cd7760e6 SW |
784 | static bool |
785 | ieee80211_ibss_process_chanswitch(struct ieee80211_sub_if_data *sdata, | |
786 | struct ieee802_11_elems *elems, | |
787 | bool beacon) | |
788 | { | |
789 | struct cfg80211_csa_settings params; | |
c0f17eb9 | 790 | struct ieee80211_csa_ie csa_ie; |
cd7760e6 | 791 | struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; |
cd7760e6 | 792 | enum nl80211_channel_type ch_type; |
82a8e17d | 793 | int err; |
cd7760e6 | 794 | u32 sta_flags; |
cd7760e6 | 795 | |
dbd72850 MK |
796 | sdata_assert_lock(sdata); |
797 | ||
cd7760e6 SW |
798 | sta_flags = IEEE80211_STA_DISABLE_VHT; |
799 | switch (ifibss->chandef.width) { | |
800 | case NL80211_CHAN_WIDTH_5: | |
801 | case NL80211_CHAN_WIDTH_10: | |
802 | case NL80211_CHAN_WIDTH_20_NOHT: | |
803 | sta_flags |= IEEE80211_STA_DISABLE_HT; | |
804 | /* fall through */ | |
805 | case NL80211_CHAN_WIDTH_20: | |
806 | sta_flags |= IEEE80211_STA_DISABLE_40MHZ; | |
807 | break; | |
808 | default: | |
809 | break; | |
810 | } | |
811 | ||
812 | memset(¶ms, 0, sizeof(params)); | |
c0f17eb9 | 813 | memset(&csa_ie, 0, sizeof(csa_ie)); |
cd7760e6 SW |
814 | err = ieee80211_parse_ch_switch_ie(sdata, elems, beacon, |
815 | ifibss->chandef.chan->band, | |
c0f17eb9 | 816 | sta_flags, ifibss->bssid, &csa_ie); |
cd7760e6 SW |
817 | /* can't switch to destination channel, fail */ |
818 | if (err < 0) | |
819 | goto disconnect; | |
820 | ||
821 | /* did not contain a CSA */ | |
822 | if (err) | |
823 | return false; | |
824 | ||
0834ae3c SW |
825 | /* channel switch is not supported, disconnect */ |
826 | if (!(sdata->local->hw.wiphy->flags & WIPHY_FLAG_HAS_CHANNEL_SWITCH)) | |
827 | goto disconnect; | |
828 | ||
c0f17eb9 CYY |
829 | params.count = csa_ie.count; |
830 | params.chandef = csa_ie.chandef; | |
831 | ||
cd7760e6 SW |
832 | switch (ifibss->chandef.width) { |
833 | case NL80211_CHAN_WIDTH_20_NOHT: | |
834 | case NL80211_CHAN_WIDTH_20: | |
835 | case NL80211_CHAN_WIDTH_40: | |
836 | /* keep our current HT mode (HT20/HT40+/HT40-), even if | |
837 | * another mode has been announced. The mode is not adopted | |
838 | * within the beacon while doing CSA and we should therefore | |
839 | * keep the mode which we announce. | |
840 | */ | |
841 | ch_type = cfg80211_get_chandef_type(&ifibss->chandef); | |
842 | cfg80211_chandef_create(¶ms.chandef, params.chandef.chan, | |
843 | ch_type); | |
844 | break; | |
845 | case NL80211_CHAN_WIDTH_5: | |
846 | case NL80211_CHAN_WIDTH_10: | |
847 | if (params.chandef.width != ifibss->chandef.width) { | |
848 | sdata_info(sdata, | |
849 | "IBSS %pM received channel switch from incompatible channel width (%d MHz, width:%d, CF1/2: %d/%d MHz), disconnecting\n", | |
850 | ifibss->bssid, | |
851 | params.chandef.chan->center_freq, | |
852 | params.chandef.width, | |
853 | params.chandef.center_freq1, | |
854 | params.chandef.center_freq2); | |
855 | goto disconnect; | |
856 | } | |
857 | break; | |
858 | default: | |
859 | /* should not happen, sta_flags should prevent VHT modes. */ | |
860 | WARN_ON(1); | |
861 | goto disconnect; | |
862 | } | |
863 | ||
8e8d347d | 864 | if (!cfg80211_reg_can_beacon(sdata->local->hw.wiphy, ¶ms.chandef)) { |
cd7760e6 SW |
865 | sdata_info(sdata, |
866 | "IBSS %pM switches to unsupported channel (%d MHz, width:%d, CF1/2: %d/%d MHz), disconnecting\n", | |
867 | ifibss->bssid, | |
868 | params.chandef.chan->center_freq, | |
869 | params.chandef.width, | |
870 | params.chandef.center_freq1, | |
871 | params.chandef.center_freq2); | |
872 | goto disconnect; | |
873 | } | |
874 | ||
875 | err = cfg80211_chandef_dfs_required(sdata->local->hw.wiphy, | |
876 | ¶ms.chandef); | |
877 | if (err < 0) | |
878 | goto disconnect; | |
879 | if (err) { | |
8e8d347d SW |
880 | /* IBSS-DFS only allowed with a control program */ |
881 | if (!ifibss->userspace_handles_dfs) | |
882 | goto disconnect; | |
cd7760e6 | 883 | |
8e8d347d | 884 | params.radar_required = true; |
cd7760e6 SW |
885 | } |
886 | ||
82a8e17d LC |
887 | if (cfg80211_chandef_identical(¶ms.chandef, |
888 | &sdata->vif.bss_conf.chandef)) { | |
889 | ibss_dbg(sdata, | |
890 | "received csa with an identical chandef, ignoring\n"); | |
891 | return true; | |
cd7760e6 | 892 | } |
cd7760e6 SW |
893 | |
894 | /* all checks done, now perform the channel switch. */ | |
895 | ibss_dbg(sdata, | |
896 | "received channel switch announcement to go to channel %d MHz\n", | |
897 | params.chandef.chan->center_freq); | |
898 | ||
c0f17eb9 | 899 | params.block_tx = !!csa_ie.mode; |
cd7760e6 | 900 | |
82a8e17d LC |
901 | if (ieee80211_channel_switch(sdata->local->hw.wiphy, sdata->dev, |
902 | ¶ms)) | |
903 | goto disconnect; | |
cd7760e6 | 904 | |
8e8d347d SW |
905 | ieee80211_ibss_csa_mark_radar(sdata); |
906 | ||
cd7760e6 SW |
907 | return true; |
908 | disconnect: | |
909 | ibss_dbg(sdata, "Can't handle channel switch, disconnect\n"); | |
910 | ieee80211_queue_work(&sdata->local->hw, | |
911 | &ifibss->csa_connection_drop_work); | |
912 | ||
8e8d347d SW |
913 | ieee80211_ibss_csa_mark_radar(sdata); |
914 | ||
cd7760e6 SW |
915 | return true; |
916 | } | |
917 | ||
918 | static void | |
919 | ieee80211_rx_mgmt_spectrum_mgmt(struct ieee80211_sub_if_data *sdata, | |
920 | struct ieee80211_mgmt *mgmt, size_t len, | |
921 | struct ieee80211_rx_status *rx_status, | |
922 | struct ieee802_11_elems *elems) | |
923 | { | |
924 | int required_len; | |
925 | ||
926 | if (len < IEEE80211_MIN_ACTION_SIZE + 1) | |
927 | return; | |
928 | ||
929 | /* CSA is the only action we handle for now */ | |
930 | if (mgmt->u.action.u.measurement.action_code != | |
931 | WLAN_ACTION_SPCT_CHL_SWITCH) | |
932 | return; | |
933 | ||
934 | required_len = IEEE80211_MIN_ACTION_SIZE + | |
935 | sizeof(mgmt->u.action.u.chan_switch); | |
936 | if (len < required_len) | |
937 | return; | |
938 | ||
82a8e17d LC |
939 | if (!sdata->vif.csa_active) |
940 | ieee80211_ibss_process_chanswitch(sdata, elems, false); | |
cd7760e6 SW |
941 | } |
942 | ||
2cc59e78 AQ |
943 | static void ieee80211_rx_mgmt_deauth_ibss(struct ieee80211_sub_if_data *sdata, |
944 | struct ieee80211_mgmt *mgmt, | |
945 | size_t len) | |
946 | { | |
947 | u16 reason = le16_to_cpu(mgmt->u.deauth.reason_code); | |
948 | ||
949 | if (len < IEEE80211_DEAUTH_FRAME_LEN) | |
950 | return; | |
951 | ||
952 | ibss_dbg(sdata, "RX DeAuth SA=%pM DA=%pM BSSID=%pM (reason: %d)\n", | |
953 | mgmt->sa, mgmt->da, mgmt->bssid, reason); | |
954 | sta_info_destroy_addr(sdata, mgmt->sa); | |
955 | } | |
956 | ||
6d810f10 AQ |
957 | static void ieee80211_rx_mgmt_auth_ibss(struct ieee80211_sub_if_data *sdata, |
958 | struct ieee80211_mgmt *mgmt, | |
959 | size_t len) | |
960 | { | |
961 | u16 auth_alg, auth_transaction; | |
962 | ||
8d61ffa5 | 963 | sdata_assert_lock(sdata); |
6d810f10 AQ |
964 | |
965 | if (len < 24 + 6) | |
966 | return; | |
967 | ||
968 | auth_alg = le16_to_cpu(mgmt->u.auth.auth_alg); | |
969 | auth_transaction = le16_to_cpu(mgmt->u.auth.auth_transaction); | |
970 | ||
bdcbd8e0 JB |
971 | ibss_dbg(sdata, |
972 | "RX Auth SA=%pM DA=%pM BSSID=%pM (auth_transaction=%d)\n", | |
973 | mgmt->sa, mgmt->da, mgmt->bssid, auth_transaction); | |
7bed2050 AQ |
974 | |
975 | if (auth_alg != WLAN_AUTH_OPEN || auth_transaction != 1) | |
976 | return; | |
977 | ||
6d810f10 AQ |
978 | /* |
979 | * IEEE 802.11 standard does not require authentication in IBSS | |
980 | * networks and most implementations do not seem to use it. | |
981 | * However, try to reply to authentication attempts if someone | |
982 | * has actually implemented this. | |
983 | */ | |
700e8ea6 | 984 | ieee80211_send_auth(sdata, 2, WLAN_AUTH_OPEN, 0, NULL, 0, |
1672c0e3 | 985 | mgmt->sa, sdata->u.ibss.bssid, NULL, 0, 0, 0); |
8bf11d8d JB |
986 | } |
987 | ||
46900298 | 988 | static void ieee80211_rx_bss_info(struct ieee80211_sub_if_data *sdata, |
d45c4172 | 989 | struct ieee80211_mgmt *mgmt, size_t len, |
46900298 | 990 | struct ieee80211_rx_status *rx_status, |
d45c4172 | 991 | struct ieee802_11_elems *elems) |
46900298 JB |
992 | { |
993 | struct ieee80211_local *local = sdata->local; | |
0c1ad2ca | 994 | struct cfg80211_bss *cbss; |
46900298 JB |
995 | struct ieee80211_bss *bss; |
996 | struct sta_info *sta; | |
997 | struct ieee80211_channel *channel; | |
998 | u64 beacon_timestamp, rx_timestamp; | |
999 | u32 supp_rates = 0; | |
1000 | enum ieee80211_band band = rx_status->band; | |
74608aca | 1001 | enum nl80211_bss_scan_width scan_width; |
13c40c54 AS |
1002 | struct ieee80211_supported_band *sband = local->hw.wiphy->bands[band]; |
1003 | bool rates_updated = false; | |
46900298 | 1004 | |
3afc2167 EG |
1005 | channel = ieee80211_get_channel(local->hw.wiphy, rx_status->freq); |
1006 | if (!channel) | |
46900298 JB |
1007 | return; |
1008 | ||
9eba6125 | 1009 | if (sdata->vif.type == NL80211_IFTYPE_ADHOC && |
b203ca39 | 1010 | ether_addr_equal(mgmt->bssid, sdata->u.ibss.bssid)) { |
46900298 JB |
1011 | |
1012 | rcu_read_lock(); | |
abe60632 | 1013 | sta = sta_info_get(sdata, mgmt->sa); |
46900298 | 1014 | |
9eba6125 | 1015 | if (elems->supp_rates) { |
2103dec1 | 1016 | supp_rates = ieee80211_sta_get_rates(sdata, elems, |
9ebb61a2 | 1017 | band, NULL); |
9eba6125 BR |
1018 | if (sta) { |
1019 | u32 prev_rates; | |
1020 | ||
1021 | prev_rates = sta->sta.supp_rates[band]; | |
1022 | /* make sure mandatory rates are always added */ | |
74608aca SW |
1023 | scan_width = NL80211_BSS_CHAN_WIDTH_20; |
1024 | if (rx_status->flag & RX_FLAG_5MHZ) | |
1025 | scan_width = NL80211_BSS_CHAN_WIDTH_5; | |
1026 | if (rx_status->flag & RX_FLAG_10MHZ) | |
1027 | scan_width = NL80211_BSS_CHAN_WIDTH_10; | |
46900298 | 1028 | |
74608aca SW |
1029 | sta->sta.supp_rates[band] = supp_rates | |
1030 | ieee80211_mandatory_rates(sband, | |
1031 | scan_width); | |
9eba6125 | 1032 | if (sta->sta.supp_rates[band] != prev_rates) { |
bdcbd8e0 JB |
1033 | ibss_dbg(sdata, |
1034 | "updated supp_rates set for %pM based on beacon/probe_resp (0x%x -> 0x%x)\n", | |
1035 | sta->sta.addr, prev_rates, | |
1036 | sta->sta.supp_rates[band]); | |
13c40c54 | 1037 | rates_updated = true; |
9eba6125 | 1038 | } |
8bf11d8d JB |
1039 | } else { |
1040 | rcu_read_unlock(); | |
9eba6125 | 1041 | sta = ieee80211_ibss_add_sta(sdata, mgmt->bssid, |
52874a5e | 1042 | mgmt->sa, supp_rates); |
8bf11d8d | 1043 | } |
34e89507 | 1044 | } |
9eba6125 BR |
1045 | |
1046 | if (sta && elems->wmm_info) | |
c2c98fde | 1047 | set_sta_flag(sta, WLAN_STA_WME); |
9eba6125 | 1048 | |
074d46d1 | 1049 | if (sta && elems->ht_operation && elems->ht_cap_elem && |
3aede78a SW |
1050 | sdata->u.ibss.chandef.width != NL80211_CHAN_WIDTH_20_NOHT && |
1051 | sdata->u.ibss.chandef.width != NL80211_CHAN_WIDTH_5 && | |
1052 | sdata->u.ibss.chandef.width != NL80211_CHAN_WIDTH_10) { | |
13c40c54 | 1053 | /* we both use HT */ |
e1a0c6b3 | 1054 | struct ieee80211_ht_cap htcap_ie; |
4bf88530 JB |
1055 | struct cfg80211_chan_def chandef; |
1056 | ||
1057 | ieee80211_ht_oper_to_chandef(channel, | |
1058 | elems->ht_operation, | |
1059 | &chandef); | |
13c40c54 | 1060 | |
e1a0c6b3 | 1061 | memcpy(&htcap_ie, elems->ht_cap_elem, sizeof(htcap_ie)); |
13c40c54 AS |
1062 | |
1063 | /* | |
1064 | * fall back to HT20 if we don't use or use | |
1065 | * the other extension channel | |
1066 | */ | |
3aede78a SW |
1067 | if (chandef.center_freq1 != |
1068 | sdata->u.ibss.chandef.center_freq1) | |
e1a0c6b3 JB |
1069 | htcap_ie.cap_info &= |
1070 | cpu_to_le16(~IEEE80211_HT_CAP_SUP_WIDTH_20_40); | |
1071 | ||
1072 | rates_updated |= ieee80211_ht_cap_ie_to_sta_ht_cap( | |
1073 | sdata, sband, &htcap_ie, sta); | |
13c40c54 AS |
1074 | } |
1075 | ||
e687f61e AQ |
1076 | if (sta && rates_updated) { |
1077 | drv_sta_rc_update(local, sdata, &sta->sta, | |
1078 | IEEE80211_RC_SUPP_RATES_CHANGED); | |
13c40c54 | 1079 | rate_control_rate_init(sta); |
e687f61e | 1080 | } |
13c40c54 | 1081 | |
9eba6125 | 1082 | rcu_read_unlock(); |
46900298 JB |
1083 | } |
1084 | ||
1085 | bss = ieee80211_bss_info_update(local, rx_status, mgmt, len, elems, | |
d45c4172 | 1086 | channel); |
46900298 JB |
1087 | if (!bss) |
1088 | return; | |
1089 | ||
0c1ad2ca JB |
1090 | cbss = container_of((void *)bss, struct cfg80211_bss, priv); |
1091 | ||
8cef2c9d JB |
1092 | /* same for beacon and probe response */ |
1093 | beacon_timestamp = le64_to_cpu(mgmt->u.beacon.timestamp); | |
46900298 JB |
1094 | |
1095 | /* check if we need to merge IBSS */ | |
1096 | ||
46900298 | 1097 | /* not an IBSS */ |
0c1ad2ca | 1098 | if (!(cbss->capability & WLAN_CAPABILITY_IBSS)) |
46900298 JB |
1099 | goto put_bss; |
1100 | ||
1101 | /* different channel */ | |
55de908a | 1102 | if (sdata->u.ibss.fixed_channel && |
3aede78a | 1103 | sdata->u.ibss.chandef.chan != cbss->channel) |
46900298 JB |
1104 | goto put_bss; |
1105 | ||
1106 | /* different SSID */ | |
1107 | if (elems->ssid_len != sdata->u.ibss.ssid_len || | |
1108 | memcmp(elems->ssid, sdata->u.ibss.ssid, | |
1109 | sdata->u.ibss.ssid_len)) | |
1110 | goto put_bss; | |
1111 | ||
cd7760e6 | 1112 | /* process channel switch */ |
82a8e17d LC |
1113 | if (sdata->vif.csa_active || |
1114 | ieee80211_ibss_process_chanswitch(sdata, elems, true)) | |
cd7760e6 SW |
1115 | goto put_bss; |
1116 | ||
34e8f082 | 1117 | /* same BSSID */ |
b203ca39 | 1118 | if (ether_addr_equal(cbss->bssid, sdata->u.ibss.bssid)) |
34e8f082 AF |
1119 | goto put_bss; |
1120 | ||
cd7760e6 SW |
1121 | /* we use a fixed BSSID */ |
1122 | if (sdata->u.ibss.fixed_bssid) | |
1123 | goto put_bss; | |
1124 | ||
f4bda337 TP |
1125 | if (ieee80211_have_rx_timestamp(rx_status)) { |
1126 | /* time when timestamp field was received */ | |
1127 | rx_timestamp = | |
1128 | ieee80211_calculate_rx_timestamp(local, rx_status, | |
1129 | len + FCS_LEN, 24); | |
24487981 JB |
1130 | } else { |
1131 | /* | |
1132 | * second best option: get current TSF | |
1133 | * (will return -1 if not supported) | |
1134 | */ | |
37a41b4a | 1135 | rx_timestamp = drv_get_tsf(local, sdata); |
24487981 | 1136 | } |
46900298 | 1137 | |
bdcbd8e0 JB |
1138 | ibss_dbg(sdata, |
1139 | "RX beacon SA=%pM BSSID=%pM TSF=0x%llx BCN=0x%llx diff=%lld @%lu\n", | |
1140 | mgmt->sa, mgmt->bssid, | |
1141 | (unsigned long long)rx_timestamp, | |
1142 | (unsigned long long)beacon_timestamp, | |
1143 | (unsigned long long)(rx_timestamp - beacon_timestamp), | |
1144 | jiffies); | |
46900298 JB |
1145 | |
1146 | if (beacon_timestamp > rx_timestamp) { | |
bdcbd8e0 JB |
1147 | ibss_dbg(sdata, |
1148 | "beacon TSF higher than local TSF - IBSS merge with BSSID %pM\n", | |
1149 | mgmt->bssid); | |
46900298 | 1150 | ieee80211_sta_join_ibss(sdata, bss); |
2103dec1 | 1151 | supp_rates = ieee80211_sta_get_rates(sdata, elems, band, NULL); |
34e89507 | 1152 | ieee80211_ibss_add_sta(sdata, mgmt->bssid, mgmt->sa, |
52874a5e | 1153 | supp_rates); |
8bf11d8d | 1154 | rcu_read_unlock(); |
46900298 JB |
1155 | } |
1156 | ||
1157 | put_bss: | |
1158 | ieee80211_rx_bss_put(local, bss); | |
1159 | } | |
1160 | ||
8bf11d8d JB |
1161 | void ieee80211_ibss_rx_no_sta(struct ieee80211_sub_if_data *sdata, |
1162 | const u8 *bssid, const u8 *addr, | |
1163 | u32 supp_rates) | |
46900298 | 1164 | { |
2e10d330 | 1165 | struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; |
46900298 JB |
1166 | struct ieee80211_local *local = sdata->local; |
1167 | struct sta_info *sta; | |
55de908a | 1168 | struct ieee80211_chanctx_conf *chanctx_conf; |
b422c6cd | 1169 | struct ieee80211_supported_band *sband; |
74608aca | 1170 | enum nl80211_bss_scan_width scan_width; |
55de908a | 1171 | int band; |
46900298 | 1172 | |
af8cdcd8 JB |
1173 | /* |
1174 | * XXX: Consider removing the least recently used entry and | |
1175 | * allow new one to be added. | |
1176 | */ | |
46900298 | 1177 | if (local->num_sta >= IEEE80211_IBSS_MAX_STA_ENTRIES) { |
bdcbd8e0 | 1178 | net_info_ratelimited("%s: No room for a new IBSS STA entry %pM\n", |
e87cc472 | 1179 | sdata->name, addr); |
8bf11d8d | 1180 | return; |
46900298 JB |
1181 | } |
1182 | ||
2e10d330 | 1183 | if (ifibss->state == IEEE80211_IBSS_MLME_SEARCH) |
8bf11d8d | 1184 | return; |
2e10d330 | 1185 | |
b203ca39 | 1186 | if (!ether_addr_equal(bssid, sdata->u.ibss.bssid)) |
8bf11d8d | 1187 | return; |
46900298 | 1188 | |
55de908a JB |
1189 | rcu_read_lock(); |
1190 | chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); | |
1191 | if (WARN_ON_ONCE(!chanctx_conf)) { | |
1192 | rcu_read_unlock(); | |
1193 | return; | |
1194 | } | |
4bf88530 | 1195 | band = chanctx_conf->def.chan->band; |
74608aca | 1196 | scan_width = cfg80211_chandef_to_scan_width(&chanctx_conf->def); |
55de908a JB |
1197 | rcu_read_unlock(); |
1198 | ||
8bf11d8d | 1199 | sta = sta_info_alloc(sdata, addr, GFP_ATOMIC); |
46900298 | 1200 | if (!sta) |
8bf11d8d | 1201 | return; |
46900298 | 1202 | |
c8716d9d | 1203 | sta->last_rx = jiffies; |
d9a7ddb0 | 1204 | |
46900298 | 1205 | /* make sure mandatory rates are always added */ |
b422c6cd | 1206 | sband = local->hw.wiphy->bands[band]; |
46900298 | 1207 | sta->sta.supp_rates[band] = supp_rates | |
74608aca | 1208 | ieee80211_mandatory_rates(sband, scan_width); |
46900298 | 1209 | |
8bf11d8d JB |
1210 | spin_lock(&ifibss->incomplete_lock); |
1211 | list_add(&sta->list, &ifibss->incomplete_stations); | |
1212 | spin_unlock(&ifibss->incomplete_lock); | |
1213 | ieee80211_queue_work(&local->hw, &sdata->work); | |
46900298 JB |
1214 | } |
1215 | ||
dad9defd AQ |
1216 | static void ieee80211_ibss_sta_expire(struct ieee80211_sub_if_data *sdata) |
1217 | { | |
1218 | struct ieee80211_local *local = sdata->local; | |
1219 | struct sta_info *sta, *tmp; | |
1220 | unsigned long exp_time = IEEE80211_IBSS_INACTIVITY_LIMIT; | |
1221 | unsigned long exp_rsn_time = IEEE80211_IBSS_RSN_INACTIVITY_LIMIT; | |
1222 | ||
1223 | mutex_lock(&local->sta_mtx); | |
1224 | ||
1225 | list_for_each_entry_safe(sta, tmp, &local->sta_list, list) { | |
1226 | if (sdata != sta->sdata) | |
1227 | continue; | |
1228 | ||
1229 | if (time_after(jiffies, sta->last_rx + exp_time) || | |
1230 | (time_after(jiffies, sta->last_rx + exp_rsn_time) && | |
1231 | sta->sta_state != IEEE80211_STA_AUTHORIZED)) { | |
1232 | sta_dbg(sta->sdata, "expiring inactive %sSTA %pM\n", | |
1233 | sta->sta_state != IEEE80211_STA_AUTHORIZED ? | |
1234 | "not authorized " : "", sta->sta.addr); | |
1235 | ||
1236 | WARN_ON(__sta_info_destroy(sta)); | |
1237 | } | |
1238 | } | |
1239 | ||
1240 | mutex_unlock(&local->sta_mtx); | |
1241 | } | |
1242 | ||
ce9058ae BP |
1243 | /* |
1244 | * This function is called with state == IEEE80211_IBSS_MLME_JOINED | |
1245 | */ | |
46900298 JB |
1246 | |
1247 | static void ieee80211_sta_merge_ibss(struct ieee80211_sub_if_data *sdata) | |
1248 | { | |
1249 | struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; | |
7ca15a0a | 1250 | enum nl80211_bss_scan_width scan_width; |
46900298 | 1251 | |
8d61ffa5 | 1252 | sdata_assert_lock(sdata); |
7a17a33c | 1253 | |
af8cdcd8 JB |
1254 | mod_timer(&ifibss->timer, |
1255 | round_jiffies(jiffies + IEEE80211_IBSS_MERGE_INTERVAL)); | |
46900298 | 1256 | |
dad9defd | 1257 | ieee80211_ibss_sta_expire(sdata); |
af8cdcd8 | 1258 | |
450aae3d S |
1259 | if (time_before(jiffies, ifibss->last_scan_completed + |
1260 | IEEE80211_IBSS_MERGE_INTERVAL)) | |
1261 | return; | |
1262 | ||
46900298 JB |
1263 | if (ieee80211_sta_active_ibss(sdata)) |
1264 | return; | |
1265 | ||
c037b836 | 1266 | if (ifibss->fixed_channel) |
46900298 JB |
1267 | return; |
1268 | ||
bdcbd8e0 JB |
1269 | sdata_info(sdata, |
1270 | "No active IBSS STAs - trying to scan for other IBSS networks with same SSID (merge)\n"); | |
46900298 | 1271 | |
7ca15a0a | 1272 | scan_width = cfg80211_chandef_to_scan_width(&ifibss->chandef); |
34bcf715 | 1273 | ieee80211_request_ibss_scan(sdata, ifibss->ssid, ifibss->ssid_len, |
7ca15a0a | 1274 | NULL, scan_width); |
46900298 JB |
1275 | } |
1276 | ||
af8cdcd8 | 1277 | static void ieee80211_sta_create_ibss(struct ieee80211_sub_if_data *sdata) |
46900298 JB |
1278 | { |
1279 | struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; | |
46900298 | 1280 | u8 bssid[ETH_ALEN]; |
46900298 JB |
1281 | u16 capability; |
1282 | int i; | |
1283 | ||
8d61ffa5 | 1284 | sdata_assert_lock(sdata); |
7a17a33c | 1285 | |
af8cdcd8 | 1286 | if (ifibss->fixed_bssid) { |
46900298 JB |
1287 | memcpy(bssid, ifibss->bssid, ETH_ALEN); |
1288 | } else { | |
1289 | /* Generate random, not broadcast, locally administered BSSID. Mix in | |
1290 | * own MAC address to make sure that devices that do not have proper | |
1291 | * random number generator get different BSSID. */ | |
1292 | get_random_bytes(bssid, ETH_ALEN); | |
1293 | for (i = 0; i < ETH_ALEN; i++) | |
47846c9b | 1294 | bssid[i] ^= sdata->vif.addr[i]; |
46900298 JB |
1295 | bssid[0] &= ~0x01; |
1296 | bssid[0] |= 0x02; | |
1297 | } | |
1298 | ||
bdcbd8e0 | 1299 | sdata_info(sdata, "Creating new IBSS network, BSSID %pM\n", bssid); |
46900298 | 1300 | |
46900298 JB |
1301 | capability = WLAN_CAPABILITY_IBSS; |
1302 | ||
fffd0934 | 1303 | if (ifibss->privacy) |
46900298 JB |
1304 | capability |= WLAN_CAPABILITY_PRIVACY; |
1305 | else | |
1306 | sdata->drop_unencrypted = 0; | |
1307 | ||
57c4d7b4 | 1308 | __ieee80211_sta_join_ibss(sdata, bssid, sdata->vif.bss_conf.beacon_int, |
75a423f4 | 1309 | &ifibss->chandef, ifibss->basic_rates, |
c13a765b | 1310 | capability, 0, true); |
46900298 JB |
1311 | } |
1312 | ||
ce9058ae BP |
1313 | /* |
1314 | * This function is called with state == IEEE80211_IBSS_MLME_SEARCH | |
1315 | */ | |
1316 | ||
af8cdcd8 | 1317 | static void ieee80211_sta_find_ibss(struct ieee80211_sub_if_data *sdata) |
46900298 JB |
1318 | { |
1319 | struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; | |
1320 | struct ieee80211_local *local = sdata->local; | |
0c1ad2ca | 1321 | struct cfg80211_bss *cbss; |
af8cdcd8 | 1322 | struct ieee80211_channel *chan = NULL; |
46900298 | 1323 | const u8 *bssid = NULL; |
7ca15a0a | 1324 | enum nl80211_bss_scan_width scan_width; |
46900298 | 1325 | int active_ibss; |
e0d61887 | 1326 | u16 capability; |
46900298 | 1327 | |
8d61ffa5 | 1328 | sdata_assert_lock(sdata); |
7a17a33c | 1329 | |
46900298 | 1330 | active_ibss = ieee80211_sta_active_ibss(sdata); |
bdcbd8e0 | 1331 | ibss_dbg(sdata, "sta_find_ibss (active_ibss=%d)\n", active_ibss); |
46900298 JB |
1332 | |
1333 | if (active_ibss) | |
af8cdcd8 | 1334 | return; |
46900298 | 1335 | |
e0d61887 | 1336 | capability = WLAN_CAPABILITY_IBSS; |
fffd0934 | 1337 | if (ifibss->privacy) |
e0d61887 | 1338 | capability |= WLAN_CAPABILITY_PRIVACY; |
af8cdcd8 JB |
1339 | if (ifibss->fixed_bssid) |
1340 | bssid = ifibss->bssid; | |
1341 | if (ifibss->fixed_channel) | |
3aede78a | 1342 | chan = ifibss->chandef.chan; |
af8cdcd8 | 1343 | if (!is_zero_ether_addr(ifibss->bssid)) |
46900298 | 1344 | bssid = ifibss->bssid; |
0c1ad2ca JB |
1345 | cbss = cfg80211_get_bss(local->hw.wiphy, chan, bssid, |
1346 | ifibss->ssid, ifibss->ssid_len, | |
1347 | WLAN_CAPABILITY_IBSS | WLAN_CAPABILITY_PRIVACY, | |
1348 | capability); | |
1349 | ||
1350 | if (cbss) { | |
1351 | struct ieee80211_bss *bss; | |
46900298 | 1352 | |
0c1ad2ca | 1353 | bss = (void *)cbss->priv; |
bdcbd8e0 JB |
1354 | ibss_dbg(sdata, |
1355 | "sta_find_ibss: selected %pM current %pM\n", | |
1356 | cbss->bssid, ifibss->bssid); | |
1357 | sdata_info(sdata, | |
1358 | "Selected IBSS BSSID %pM based on configured SSID\n", | |
1359 | cbss->bssid); | |
46900298 | 1360 | |
af8cdcd8 | 1361 | ieee80211_sta_join_ibss(sdata, bss); |
46900298 | 1362 | ieee80211_rx_bss_put(local, bss); |
af8cdcd8 | 1363 | return; |
d419b9f0 | 1364 | } |
46900298 | 1365 | |
d8eb741e AQ |
1366 | /* if a fixed bssid and a fixed freq have been provided create the IBSS |
1367 | * directly and do not waste time scanning | |
1368 | */ | |
1369 | if (ifibss->fixed_bssid && ifibss->fixed_channel) { | |
1370 | sdata_info(sdata, "Created IBSS using preconfigured BSSID %pM\n", | |
1371 | bssid); | |
1372 | ieee80211_sta_create_ibss(sdata); | |
1373 | return; | |
1374 | } | |
1375 | ||
1376 | ||
bdcbd8e0 | 1377 | ibss_dbg(sdata, "sta_find_ibss: did not try to join ibss\n"); |
46900298 JB |
1378 | |
1379 | /* Selected IBSS not found in current scan results - try to scan */ | |
ce9058ae | 1380 | if (time_after(jiffies, ifibss->last_scan_completed + |
46900298 | 1381 | IEEE80211_SCAN_INTERVAL)) { |
bdcbd8e0 | 1382 | sdata_info(sdata, "Trigger new scan to find an IBSS to join\n"); |
46900298 | 1383 | |
7ca15a0a | 1384 | scan_width = cfg80211_chandef_to_scan_width(&ifibss->chandef); |
34bcf715 | 1385 | ieee80211_request_ibss_scan(sdata, ifibss->ssid, |
7ca15a0a SW |
1386 | ifibss->ssid_len, chan, |
1387 | scan_width); | |
ce9058ae | 1388 | } else { |
46900298 JB |
1389 | int interval = IEEE80211_SCAN_INTERVAL; |
1390 | ||
1391 | if (time_after(jiffies, ifibss->ibss_join_req + | |
55de908a JB |
1392 | IEEE80211_IBSS_JOIN_TIMEOUT)) |
1393 | ieee80211_sta_create_ibss(sdata); | |
46900298 | 1394 | |
af8cdcd8 JB |
1395 | mod_timer(&ifibss->timer, |
1396 | round_jiffies(jiffies + interval)); | |
46900298 | 1397 | } |
46900298 JB |
1398 | } |
1399 | ||
1400 | static void ieee80211_rx_mgmt_probe_req(struct ieee80211_sub_if_data *sdata, | |
c269a203 | 1401 | struct sk_buff *req) |
46900298 | 1402 | { |
c269a203 | 1403 | struct ieee80211_mgmt *mgmt = (void *)req->data; |
46900298 JB |
1404 | struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; |
1405 | struct ieee80211_local *local = sdata->local; | |
c269a203 | 1406 | int tx_last_beacon, len = req->len; |
46900298 | 1407 | struct sk_buff *skb; |
c3ffeab4 | 1408 | struct beacon_data *presp; |
46900298 JB |
1409 | u8 *pos, *end; |
1410 | ||
8d61ffa5 | 1411 | sdata_assert_lock(sdata); |
7a17a33c | 1412 | |
40b275b6 | 1413 | presp = rcu_dereference_protected(ifibss->presp, |
8d61ffa5 | 1414 | lockdep_is_held(&sdata->wdev.mtx)); |
40b275b6 | 1415 | |
46900298 | 1416 | if (ifibss->state != IEEE80211_IBSS_MLME_JOINED || |
40b275b6 | 1417 | len < 24 + 2 || !presp) |
46900298 JB |
1418 | return; |
1419 | ||
24487981 | 1420 | tx_last_beacon = drv_tx_last_beacon(local); |
46900298 | 1421 | |
bdcbd8e0 JB |
1422 | ibss_dbg(sdata, |
1423 | "RX ProbeReq SA=%pM DA=%pM BSSID=%pM (tx_last_beacon=%d)\n", | |
1424 | mgmt->sa, mgmt->da, mgmt->bssid, tx_last_beacon); | |
46900298 | 1425 | |
1ed76487 | 1426 | if (!tx_last_beacon && is_multicast_ether_addr(mgmt->da)) |
46900298 JB |
1427 | return; |
1428 | ||
b203ca39 | 1429 | if (!ether_addr_equal(mgmt->bssid, ifibss->bssid) && |
888d04df | 1430 | !is_broadcast_ether_addr(mgmt->bssid)) |
46900298 JB |
1431 | return; |
1432 | ||
1433 | end = ((u8 *) mgmt) + len; | |
1434 | pos = mgmt->u.probe_req.variable; | |
1435 | if (pos[0] != WLAN_EID_SSID || | |
1436 | pos + 2 + pos[1] > end) { | |
bdcbd8e0 JB |
1437 | ibss_dbg(sdata, "Invalid SSID IE in ProbeReq from %pM\n", |
1438 | mgmt->sa); | |
46900298 JB |
1439 | return; |
1440 | } | |
1441 | if (pos[1] != 0 && | |
1442 | (pos[1] != ifibss->ssid_len || | |
0da780c2 | 1443 | memcmp(pos + 2, ifibss->ssid, ifibss->ssid_len))) { |
46900298 JB |
1444 | /* Ignore ProbeReq for foreign SSID */ |
1445 | return; | |
1446 | } | |
1447 | ||
1448 | /* Reply with ProbeResp */ | |
c3ffeab4 | 1449 | skb = dev_alloc_skb(local->tx_headroom + presp->head_len); |
46900298 JB |
1450 | if (!skb) |
1451 | return; | |
1452 | ||
c3ffeab4 JB |
1453 | skb_reserve(skb, local->tx_headroom); |
1454 | memcpy(skb_put(skb, presp->head_len), presp->head, presp->head_len); | |
1455 | ||
1456 | memcpy(((struct ieee80211_mgmt *) skb->data)->da, mgmt->sa, ETH_ALEN); | |
1457 | ibss_dbg(sdata, "Sending ProbeResp to %pM\n", mgmt->sa); | |
62ae67be | 1458 | IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT; |
691eb61b SW |
1459 | |
1460 | /* avoid excessive retries for probe request to wildcard SSIDs */ | |
1461 | if (pos[1] == 0) | |
1462 | IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_CTL_NO_ACK; | |
1463 | ||
62ae67be | 1464 | ieee80211_tx_skb(sdata, skb); |
46900298 JB |
1465 | } |
1466 | ||
d45c4172 EG |
1467 | static |
1468 | void ieee80211_rx_mgmt_probe_beacon(struct ieee80211_sub_if_data *sdata, | |
1469 | struct ieee80211_mgmt *mgmt, size_t len, | |
1470 | struct ieee80211_rx_status *rx_status) | |
46900298 JB |
1471 | { |
1472 | size_t baselen; | |
1473 | struct ieee802_11_elems elems; | |
1474 | ||
d45c4172 EG |
1475 | BUILD_BUG_ON(offsetof(typeof(mgmt->u.probe_resp), variable) != |
1476 | offsetof(typeof(mgmt->u.beacon), variable)); | |
1477 | ||
1478 | /* | |
1479 | * either beacon or probe_resp but the variable field is at the | |
1480 | * same offset | |
1481 | */ | |
46900298 JB |
1482 | baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt; |
1483 | if (baselen > len) | |
1484 | return; | |
1485 | ||
1486 | ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen, | |
b2e506bf | 1487 | false, &elems); |
46900298 | 1488 | |
d45c4172 | 1489 | ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems); |
46900298 JB |
1490 | } |
1491 | ||
1fa57d01 JB |
1492 | void ieee80211_ibss_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata, |
1493 | struct sk_buff *skb) | |
46900298 JB |
1494 | { |
1495 | struct ieee80211_rx_status *rx_status; | |
1496 | struct ieee80211_mgmt *mgmt; | |
1497 | u16 fc; | |
cd7760e6 SW |
1498 | struct ieee802_11_elems elems; |
1499 | int ies_len; | |
46900298 | 1500 | |
f1d58c25 | 1501 | rx_status = IEEE80211_SKB_RXCB(skb); |
46900298 JB |
1502 | mgmt = (struct ieee80211_mgmt *) skb->data; |
1503 | fc = le16_to_cpu(mgmt->frame_control); | |
1504 | ||
8d61ffa5 | 1505 | sdata_lock(sdata); |
7a17a33c | 1506 | |
c926d006 TH |
1507 | if (!sdata->u.ibss.ssid_len) |
1508 | goto mgmt_out; /* not ready to merge yet */ | |
1509 | ||
46900298 JB |
1510 | switch (fc & IEEE80211_FCTL_STYPE) { |
1511 | case IEEE80211_STYPE_PROBE_REQ: | |
c269a203 | 1512 | ieee80211_rx_mgmt_probe_req(sdata, skb); |
46900298 JB |
1513 | break; |
1514 | case IEEE80211_STYPE_PROBE_RESP: | |
46900298 | 1515 | case IEEE80211_STYPE_BEACON: |
d45c4172 EG |
1516 | ieee80211_rx_mgmt_probe_beacon(sdata, mgmt, skb->len, |
1517 | rx_status); | |
46900298 JB |
1518 | break; |
1519 | case IEEE80211_STYPE_AUTH: | |
1520 | ieee80211_rx_mgmt_auth_ibss(sdata, mgmt, skb->len); | |
1521 | break; | |
2cc59e78 AQ |
1522 | case IEEE80211_STYPE_DEAUTH: |
1523 | ieee80211_rx_mgmt_deauth_ibss(sdata, mgmt, skb->len); | |
1524 | break; | |
cd7760e6 SW |
1525 | case IEEE80211_STYPE_ACTION: |
1526 | switch (mgmt->u.action.category) { | |
1527 | case WLAN_CATEGORY_SPECTRUM_MGMT: | |
1528 | ies_len = skb->len - | |
1529 | offsetof(struct ieee80211_mgmt, | |
1530 | u.action.u.chan_switch.variable); | |
1531 | ||
1532 | if (ies_len < 0) | |
1533 | break; | |
1534 | ||
1535 | ieee802_11_parse_elems( | |
1536 | mgmt->u.action.u.chan_switch.variable, | |
1537 | ies_len, true, &elems); | |
1538 | ||
1539 | if (elems.parse_error) | |
1540 | break; | |
1541 | ||
1542 | ieee80211_rx_mgmt_spectrum_mgmt(sdata, mgmt, skb->len, | |
1543 | rx_status, &elems); | |
1544 | break; | |
1545 | } | |
46900298 | 1546 | } |
7a17a33c | 1547 | |
c926d006 | 1548 | mgmt_out: |
8d61ffa5 | 1549 | sdata_unlock(sdata); |
46900298 JB |
1550 | } |
1551 | ||
1fa57d01 | 1552 | void ieee80211_ibss_work(struct ieee80211_sub_if_data *sdata) |
46900298 | 1553 | { |
1fa57d01 | 1554 | struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; |
8bf11d8d | 1555 | struct sta_info *sta; |
46900298 | 1556 | |
8d61ffa5 | 1557 | sdata_lock(sdata); |
7a17a33c JB |
1558 | |
1559 | /* | |
1560 | * Work could be scheduled after scan or similar | |
1561 | * when we aren't even joined (or trying) with a | |
1562 | * network. | |
1563 | */ | |
1564 | if (!ifibss->ssid_len) | |
1565 | goto out; | |
46900298 | 1566 | |
8bf11d8d JB |
1567 | spin_lock_bh(&ifibss->incomplete_lock); |
1568 | while (!list_empty(&ifibss->incomplete_stations)) { | |
1569 | sta = list_first_entry(&ifibss->incomplete_stations, | |
1570 | struct sta_info, list); | |
1571 | list_del(&sta->list); | |
1572 | spin_unlock_bh(&ifibss->incomplete_lock); | |
1573 | ||
52874a5e | 1574 | ieee80211_ibss_finish_sta(sta); |
8bf11d8d JB |
1575 | rcu_read_unlock(); |
1576 | spin_lock_bh(&ifibss->incomplete_lock); | |
1577 | } | |
1578 | spin_unlock_bh(&ifibss->incomplete_lock); | |
1579 | ||
46900298 JB |
1580 | switch (ifibss->state) { |
1581 | case IEEE80211_IBSS_MLME_SEARCH: | |
1582 | ieee80211_sta_find_ibss(sdata); | |
1583 | break; | |
1584 | case IEEE80211_IBSS_MLME_JOINED: | |
1585 | ieee80211_sta_merge_ibss(sdata); | |
1586 | break; | |
1587 | default: | |
1588 | WARN_ON(1); | |
1589 | break; | |
1590 | } | |
46900298 | 1591 | |
7a17a33c | 1592 | out: |
8d61ffa5 | 1593 | sdata_unlock(sdata); |
3a4d4aa2 JB |
1594 | } |
1595 | ||
46900298 JB |
1596 | static void ieee80211_ibss_timer(unsigned long data) |
1597 | { | |
1598 | struct ieee80211_sub_if_data *sdata = | |
1599 | (struct ieee80211_sub_if_data *) data; | |
5bb644a0 | 1600 | |
a6182943 | 1601 | ieee80211_queue_work(&sdata->local->hw, &sdata->work); |
5bb644a0 | 1602 | } |
5bb644a0 | 1603 | |
46900298 JB |
1604 | void ieee80211_ibss_setup_sdata(struct ieee80211_sub_if_data *sdata) |
1605 | { | |
1606 | struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; | |
1607 | ||
46900298 JB |
1608 | setup_timer(&ifibss->timer, ieee80211_ibss_timer, |
1609 | (unsigned long) sdata); | |
8bf11d8d JB |
1610 | INIT_LIST_HEAD(&ifibss->incomplete_stations); |
1611 | spin_lock_init(&ifibss->incomplete_lock); | |
cd7760e6 SW |
1612 | INIT_WORK(&ifibss->csa_connection_drop_work, |
1613 | ieee80211_csa_connection_drop_work); | |
46900298 JB |
1614 | } |
1615 | ||
1616 | /* scan finished notification */ | |
1617 | void ieee80211_ibss_notify_scan_completed(struct ieee80211_local *local) | |
1618 | { | |
af8cdcd8 | 1619 | struct ieee80211_sub_if_data *sdata; |
46900298 | 1620 | |
29b4a4f7 JB |
1621 | mutex_lock(&local->iflist_mtx); |
1622 | list_for_each_entry(sdata, &local->interfaces, list) { | |
9607e6b6 | 1623 | if (!ieee80211_sdata_running(sdata)) |
0e41f715 | 1624 | continue; |
af8cdcd8 JB |
1625 | if (sdata->vif.type != NL80211_IFTYPE_ADHOC) |
1626 | continue; | |
1627 | sdata->u.ibss.last_scan_completed = jiffies; | |
7a17a33c | 1628 | ieee80211_queue_work(&local->hw, &sdata->work); |
46900298 | 1629 | } |
29b4a4f7 | 1630 | mutex_unlock(&local->iflist_mtx); |
46900298 JB |
1631 | } |
1632 | ||
af8cdcd8 JB |
1633 | int ieee80211_ibss_join(struct ieee80211_sub_if_data *sdata, |
1634 | struct cfg80211_ibss_params *params) | |
1635 | { | |
ff3cc5f4 | 1636 | u32 changed = 0; |
2103dec1 SW |
1637 | u32 rate_flags; |
1638 | struct ieee80211_supported_band *sband; | |
1639 | int i; | |
af8cdcd8 | 1640 | |
af8cdcd8 JB |
1641 | if (params->bssid) { |
1642 | memcpy(sdata->u.ibss.bssid, params->bssid, ETH_ALEN); | |
1643 | sdata->u.ibss.fixed_bssid = true; | |
1644 | } else | |
1645 | sdata->u.ibss.fixed_bssid = false; | |
1646 | ||
fffd0934 | 1647 | sdata->u.ibss.privacy = params->privacy; |
267335d6 | 1648 | sdata->u.ibss.control_port = params->control_port; |
8e8d347d | 1649 | sdata->u.ibss.userspace_handles_dfs = params->userspace_handles_dfs; |
fbd2c8dc | 1650 | sdata->u.ibss.basic_rates = params->basic_rates; |
2103dec1 SW |
1651 | |
1652 | /* fix basic_rates if channel does not support these rates */ | |
1653 | rate_flags = ieee80211_chandef_rate_flags(¶ms->chandef); | |
1654 | sband = sdata->local->hw.wiphy->bands[params->chandef.chan->band]; | |
1655 | for (i = 0; i < sband->n_bitrates; i++) { | |
1656 | if ((rate_flags & sband->bitrates[i].flags) != rate_flags) | |
1657 | sdata->u.ibss.basic_rates &= ~BIT(i); | |
1658 | } | |
dd5b4cc7 FF |
1659 | memcpy(sdata->vif.bss_conf.mcast_rate, params->mcast_rate, |
1660 | sizeof(params->mcast_rate)); | |
fffd0934 | 1661 | |
57c4d7b4 JB |
1662 | sdata->vif.bss_conf.beacon_int = params->beacon_interval; |
1663 | ||
3aede78a | 1664 | sdata->u.ibss.chandef = params->chandef; |
af8cdcd8 JB |
1665 | sdata->u.ibss.fixed_channel = params->channel_fixed; |
1666 | ||
1667 | if (params->ie) { | |
1668 | sdata->u.ibss.ie = kmemdup(params->ie, params->ie_len, | |
1669 | GFP_KERNEL); | |
1670 | if (sdata->u.ibss.ie) | |
1671 | sdata->u.ibss.ie_len = params->ie_len; | |
1672 | } | |
1673 | ||
af8cdcd8 JB |
1674 | sdata->u.ibss.state = IEEE80211_IBSS_MLME_SEARCH; |
1675 | sdata->u.ibss.ibss_join_req = jiffies; | |
1676 | ||
badecb00 | 1677 | memcpy(sdata->u.ibss.ssid, params->ssid, params->ssid_len); |
0e41f715 JB |
1678 | sdata->u.ibss.ssid_len = params->ssid_len; |
1679 | ||
822854b0 SW |
1680 | memcpy(&sdata->u.ibss.ht_capa, ¶ms->ht_capa, |
1681 | sizeof(sdata->u.ibss.ht_capa)); | |
1682 | memcpy(&sdata->u.ibss.ht_capa_mask, ¶ms->ht_capa_mask, | |
1683 | sizeof(sdata->u.ibss.ht_capa_mask)); | |
1684 | ||
ff3cc5f4 SW |
1685 | /* |
1686 | * 802.11n-2009 9.13.3.1: In an IBSS, the HT Protection field is | |
1687 | * reserved, but an HT STA shall protect HT transmissions as though | |
1688 | * the HT Protection field were set to non-HT mixed mode. | |
1689 | * | |
1690 | * In an IBSS, the RIFS Mode field of the HT Operation element is | |
1691 | * also reserved, but an HT STA shall operate as though this field | |
1692 | * were set to 1. | |
1693 | */ | |
1694 | ||
1695 | sdata->vif.bss_conf.ht_operation_mode |= | |
1696 | IEEE80211_HT_OP_MODE_PROTECTION_NONHT_MIXED | |
1697 | | IEEE80211_HT_PARAM_RIFS_MODE; | |
1698 | ||
1699 | changed |= BSS_CHANGED_HT; | |
1700 | ieee80211_bss_info_change_notify(sdata, changed); | |
1701 | ||
04ecd257 JB |
1702 | sdata->smps_mode = IEEE80211_SMPS_OFF; |
1703 | sdata->needed_rx_chains = sdata->local->rx_chains; | |
1704 | ||
64592c8f | 1705 | ieee80211_queue_work(&sdata->local->hw, &sdata->work); |
af8cdcd8 JB |
1706 | |
1707 | return 0; | |
1708 | } | |
1709 | ||
1710 | int ieee80211_ibss_leave(struct ieee80211_sub_if_data *sdata) | |
1711 | { | |
5ea096c0 | 1712 | struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; |
5ea096c0 | 1713 | |
871a4180 | 1714 | ieee80211_ibss_disconnect(sdata); |
b78a4932 | 1715 | ifibss->ssid_len = 0; |
871a4180 | 1716 | memset(ifibss->bssid, 0, ETH_ALEN); |
af8cdcd8 JB |
1717 | |
1718 | /* remove beacon */ | |
1719 | kfree(sdata->u.ibss.ie); | |
822854b0 SW |
1720 | |
1721 | /* on the next join, re-program HT parameters */ | |
1722 | memset(&ifibss->ht_capa, 0, sizeof(ifibss->ht_capa)); | |
1723 | memset(&ifibss->ht_capa_mask, 0, sizeof(ifibss->ht_capa_mask)); | |
1724 | ||
af8cdcd8 | 1725 | synchronize_rcu(); |
af8cdcd8 | 1726 | |
35f20c14 | 1727 | skb_queue_purge(&sdata->skb_queue); |
5cff20e6 | 1728 | |
bc05d19f | 1729 | del_timer_sync(&sdata->u.ibss.timer); |
7a17a33c | 1730 | |
af8cdcd8 JB |
1731 | return 0; |
1732 | } |