Commit | Line | Data |
---|---|---|
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); | |
af296bdb | 146 | presp->csa_counter_offsets[0] = (pos - presp->head); |
cd7760e6 SW |
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 | ||
40b861a0 AN |
192 | if (local->hw.queues >= IEEE80211_NUM_ACS) |
193 | pos = ieee80211_add_wmm_info_ie(pos, 0); /* U-APSD not in use */ | |
9eba6125 | 194 | |
c3ffeab4 JB |
195 | presp->head_len = pos - presp->head; |
196 | if (WARN_ON(presp->head_len > frame_len)) | |
d51b70ff SW |
197 | goto error; |
198 | ||
199 | return presp; | |
200 | error: | |
201 | kfree(presp); | |
202 | return NULL; | |
203 | } | |
204 | ||
205 | static void __ieee80211_sta_join_ibss(struct ieee80211_sub_if_data *sdata, | |
206 | const u8 *bssid, const int beacon_int, | |
b35c8097 | 207 | struct cfg80211_chan_def *req_chandef, |
d51b70ff SW |
208 | const u32 basic_rates, |
209 | const u16 capability, u64 tsf, | |
210 | bool creator) | |
211 | { | |
212 | struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; | |
213 | struct ieee80211_local *local = sdata->local; | |
d51b70ff SW |
214 | struct ieee80211_mgmt *mgmt; |
215 | struct cfg80211_bss *bss; | |
216 | u32 bss_change; | |
217 | struct cfg80211_chan_def chandef; | |
b35c8097 | 218 | struct ieee80211_channel *chan; |
d51b70ff SW |
219 | struct beacon_data *presp; |
220 | enum nl80211_bss_scan_width scan_width; | |
221 | bool have_higher_than_11mbit; | |
2beb6dab | 222 | bool radar_required; |
55fff501 | 223 | int err; |
d51b70ff SW |
224 | |
225 | sdata_assert_lock(sdata); | |
226 | ||
227 | /* Reset own TSF to allow time synchronization work. */ | |
228 | drv_reset_tsf(local, sdata); | |
229 | ||
230 | if (!ether_addr_equal(ifibss->bssid, bssid)) | |
231 | sta_info_flush(sdata); | |
232 | ||
233 | /* if merging, indicate to driver that we leave the old IBSS */ | |
234 | if (sdata->vif.bss_conf.ibss_joined) { | |
235 | sdata->vif.bss_conf.ibss_joined = false; | |
236 | sdata->vif.bss_conf.ibss_creator = false; | |
237 | sdata->vif.bss_conf.enable_beacon = false; | |
238 | netif_carrier_off(sdata->dev); | |
239 | ieee80211_bss_info_change_notify(sdata, | |
240 | BSS_CHANGED_IBSS | | |
241 | BSS_CHANGED_BEACON_ENABLED); | |
55fff501 | 242 | drv_leave_ibss(local, sdata); |
d51b70ff SW |
243 | } |
244 | ||
245 | presp = rcu_dereference_protected(ifibss->presp, | |
246 | lockdep_is_held(&sdata->wdev.mtx)); | |
0c2bef46 | 247 | RCU_INIT_POINTER(ifibss->presp, NULL); |
d51b70ff SW |
248 | if (presp) |
249 | kfree_rcu(presp, rcu_head); | |
250 | ||
251 | sdata->drop_unencrypted = capability & WLAN_CAPABILITY_PRIVACY ? 1 : 0; | |
252 | ||
b35c8097 JL |
253 | /* make a copy of the chandef, it could be modified below. */ |
254 | chandef = *req_chandef; | |
255 | chan = chandef.chan; | |
174e0cd2 IP |
256 | if (!cfg80211_reg_can_beacon(local->hw.wiphy, &chandef, |
257 | NL80211_IFTYPE_ADHOC)) { | |
d51b70ff SW |
258 | if (chandef.width == NL80211_CHAN_WIDTH_5 || |
259 | chandef.width == NL80211_CHAN_WIDTH_10 || | |
260 | chandef.width == NL80211_CHAN_WIDTH_20_NOHT || | |
261 | chandef.width == NL80211_CHAN_WIDTH_20) { | |
262 | sdata_info(sdata, | |
263 | "Failed to join IBSS, beacons forbidden\n"); | |
264 | return; | |
265 | } | |
266 | chandef.width = NL80211_CHAN_WIDTH_20; | |
267 | chandef.center_freq1 = chan->center_freq; | |
8e8d347d | 268 | /* check again for downgraded chandef */ |
174e0cd2 IP |
269 | if (!cfg80211_reg_can_beacon(local->hw.wiphy, &chandef, |
270 | NL80211_IFTYPE_ADHOC)) { | |
8e8d347d SW |
271 | sdata_info(sdata, |
272 | "Failed to join IBSS, beacons forbidden\n"); | |
273 | return; | |
274 | } | |
275 | } | |
276 | ||
277 | err = cfg80211_chandef_dfs_required(sdata->local->hw.wiphy, | |
2beb6dab | 278 | &chandef, NL80211_IFTYPE_ADHOC); |
6658ab80 LC |
279 | if (err < 0) { |
280 | sdata_info(sdata, | |
281 | "Failed to join IBSS, invalid chandef\n"); | |
282 | return; | |
283 | } | |
2beb6dab LC |
284 | if (err > 0 && !ifibss->userspace_handles_dfs) { |
285 | sdata_info(sdata, | |
286 | "Failed to join IBSS, DFS channel without control program\n"); | |
287 | return; | |
d51b70ff SW |
288 | } |
289 | ||
2beb6dab LC |
290 | radar_required = err; |
291 | ||
34a3740d | 292 | mutex_lock(&local->mtx); |
d51b70ff SW |
293 | if (ieee80211_vif_use_channel(sdata, &chandef, |
294 | ifibss->fixed_channel ? | |
295 | IEEE80211_CHANCTX_SHARED : | |
296 | IEEE80211_CHANCTX_EXCLUSIVE)) { | |
297 | sdata_info(sdata, "Failed to join IBSS, no channel context\n"); | |
34a3740d | 298 | mutex_unlock(&local->mtx); |
d51b70ff SW |
299 | return; |
300 | } | |
cc901de1 | 301 | sdata->radar_required = radar_required; |
34a3740d | 302 | mutex_unlock(&local->mtx); |
d51b70ff SW |
303 | |
304 | memcpy(ifibss->bssid, bssid, ETH_ALEN); | |
305 | ||
d51b70ff SW |
306 | presp = ieee80211_ibss_build_presp(sdata, beacon_int, basic_rates, |
307 | capability, tsf, &chandef, | |
cd7760e6 | 308 | &have_higher_than_11mbit, NULL); |
d51b70ff | 309 | if (!presp) |
c3ffeab4 JB |
310 | return; |
311 | ||
312 | rcu_assign_pointer(ifibss->presp, presp); | |
d51b70ff | 313 | mgmt = (void *)presp->head; |
46900298 | 314 | |
d6a83228 | 315 | sdata->vif.bss_conf.enable_beacon = true; |
2d0ddec5 | 316 | sdata->vif.bss_conf.beacon_int = beacon_int; |
fbd2c8dc | 317 | sdata->vif.bss_conf.basic_rates = basic_rates; |
0ca54f6c MP |
318 | sdata->vif.bss_conf.ssid_len = ifibss->ssid_len; |
319 | memcpy(sdata->vif.bss_conf.ssid, ifibss->ssid, ifibss->ssid_len); | |
2d0ddec5 JB |
320 | bss_change = BSS_CHANGED_BEACON_INT; |
321 | bss_change |= ieee80211_reset_erp_info(sdata); | |
322 | bss_change |= BSS_CHANGED_BSSID; | |
323 | bss_change |= BSS_CHANGED_BEACON; | |
324 | bss_change |= BSS_CHANGED_BEACON_ENABLED; | |
392cfdb1 | 325 | bss_change |= BSS_CHANGED_BASIC_RATES; |
13c40c54 | 326 | bss_change |= BSS_CHANGED_HT; |
8fc214ba | 327 | bss_change |= BSS_CHANGED_IBSS; |
0ca54f6c | 328 | bss_change |= BSS_CHANGED_SSID; |
2f91a967 SW |
329 | |
330 | /* | |
331 | * In 5 GHz/802.11a, we can always use short slot time. | |
332 | * (IEEE 802.11-2012 18.3.8.7) | |
333 | * | |
334 | * In 2.4GHz, we must always use long slots in IBSS for compatibility | |
335 | * reasons. | |
336 | * (IEEE 802.11-2012 19.4.5) | |
337 | * | |
338 | * HT follows these specifications (IEEE 802.11-2012 20.3.18) | |
339 | */ | |
340 | sdata->vif.bss_conf.use_short_slot = chan->band == IEEE80211_BAND_5GHZ; | |
341 | bss_change |= BSS_CHANGED_ERP_SLOT; | |
342 | ||
2ec9c1f6 SW |
343 | /* cf. IEEE 802.11 9.2.12 */ |
344 | if (chan->band == IEEE80211_BAND_2GHZ && have_higher_than_11mbit) | |
345 | sdata->flags |= IEEE80211_SDATA_OPERATING_GMODE; | |
346 | else | |
347 | sdata->flags &= ~IEEE80211_SDATA_OPERATING_GMODE; | |
348 | ||
55fff501 JB |
349 | ieee80211_set_wmm_default(sdata, true); |
350 | ||
8fc214ba | 351 | sdata->vif.bss_conf.ibss_joined = true; |
c13a765b | 352 | sdata->vif.bss_conf.ibss_creator = creator; |
46900298 | 353 | |
55fff501 JB |
354 | err = drv_join_ibss(local, sdata); |
355 | if (err) { | |
356 | sdata->vif.bss_conf.ibss_joined = false; | |
357 | sdata->vif.bss_conf.ibss_creator = false; | |
358 | sdata->vif.bss_conf.enable_beacon = false; | |
359 | sdata->vif.bss_conf.ssid_len = 0; | |
360 | RCU_INIT_POINTER(ifibss->presp, NULL); | |
361 | kfree_rcu(presp, rcu_head); | |
34a3740d | 362 | mutex_lock(&local->mtx); |
55fff501 | 363 | ieee80211_vif_release_channel(sdata); |
34a3740d | 364 | mutex_unlock(&local->mtx); |
55fff501 JB |
365 | sdata_info(sdata, "Failed to join IBSS, driver failure: %d\n", |
366 | err); | |
367 | return; | |
368 | } | |
369 | ||
370 | ieee80211_bss_info_change_notify(sdata, bss_change); | |
46900298 | 371 | |
46900298 | 372 | ifibss->state = IEEE80211_IBSS_MLME_JOINED; |
af8cdcd8 JB |
373 | mod_timer(&ifibss->timer, |
374 | round_jiffies(jiffies + IEEE80211_IBSS_MERGE_INTERVAL)); | |
46900298 | 375 | |
7ca15a0a SW |
376 | scan_width = cfg80211_chandef_to_scan_width(&chandef); |
377 | bss = cfg80211_inform_bss_width_frame(local->hw.wiphy, chan, | |
378 | scan_width, mgmt, | |
379 | presp->head_len, 0, GFP_KERNEL); | |
5b112d3d | 380 | cfg80211_put_bss(local->hw.wiphy, bss); |
86a2ea41 | 381 | netif_carrier_on(sdata->dev); |
fe94f3a4 | 382 | cfg80211_ibss_joined(sdata->dev, ifibss->bssid, chan, GFP_KERNEL); |
46900298 JB |
383 | } |
384 | ||
af8cdcd8 JB |
385 | static void ieee80211_sta_join_ibss(struct ieee80211_sub_if_data *sdata, |
386 | struct ieee80211_bss *bss) | |
46900298 | 387 | { |
0c1ad2ca JB |
388 | struct cfg80211_bss *cbss = |
389 | container_of((void *)bss, struct cfg80211_bss, priv); | |
b59066a2 | 390 | struct ieee80211_supported_band *sband; |
75a423f4 | 391 | struct cfg80211_chan_def chandef; |
b59066a2 JB |
392 | u32 basic_rates; |
393 | int i, j; | |
0c1ad2ca | 394 | u16 beacon_int = cbss->beacon_interval; |
8cef2c9d | 395 | const struct cfg80211_bss_ies *ies; |
75a423f4 | 396 | enum nl80211_channel_type chan_type; |
8cef2c9d | 397 | u64 tsf; |
2103dec1 SW |
398 | u32 rate_flags; |
399 | int shift; | |
57c4d7b4 | 400 | |
8d61ffa5 | 401 | sdata_assert_lock(sdata); |
7a17a33c | 402 | |
57c4d7b4 JB |
403 | if (beacon_int < 10) |
404 | beacon_int = 10; | |
405 | ||
75a423f4 SW |
406 | switch (sdata->u.ibss.chandef.width) { |
407 | case NL80211_CHAN_WIDTH_20_NOHT: | |
408 | case NL80211_CHAN_WIDTH_20: | |
409 | case NL80211_CHAN_WIDTH_40: | |
410 | chan_type = cfg80211_get_chandef_type(&sdata->u.ibss.chandef); | |
411 | cfg80211_chandef_create(&chandef, cbss->channel, chan_type); | |
412 | break; | |
413 | case NL80211_CHAN_WIDTH_5: | |
414 | case NL80211_CHAN_WIDTH_10: | |
415 | cfg80211_chandef_create(&chandef, cbss->channel, | |
416 | NL80211_CHAN_WIDTH_20_NOHT); | |
417 | chandef.width = sdata->u.ibss.chandef.width; | |
418 | break; | |
419 | default: | |
420 | /* fall back to 20 MHz for unsupported modes */ | |
421 | cfg80211_chandef_create(&chandef, cbss->channel, | |
422 | NL80211_CHAN_WIDTH_20_NOHT); | |
423 | break; | |
424 | } | |
425 | ||
0c1ad2ca | 426 | sband = sdata->local->hw.wiphy->bands[cbss->channel->band]; |
2103dec1 SW |
427 | rate_flags = ieee80211_chandef_rate_flags(&sdata->u.ibss.chandef); |
428 | shift = ieee80211_vif_get_shift(&sdata->vif); | |
b59066a2 JB |
429 | |
430 | basic_rates = 0; | |
431 | ||
432 | for (i = 0; i < bss->supp_rates_len; i++) { | |
2103dec1 | 433 | int rate = bss->supp_rates[i] & 0x7f; |
b59066a2 JB |
434 | bool is_basic = !!(bss->supp_rates[i] & 0x80); |
435 | ||
436 | for (j = 0; j < sband->n_bitrates; j++) { | |
2103dec1 SW |
437 | int brate; |
438 | if ((rate_flags & sband->bitrates[j].flags) | |
439 | != rate_flags) | |
440 | continue; | |
441 | ||
442 | brate = DIV_ROUND_UP(sband->bitrates[j].bitrate, | |
443 | 5 * (1 << shift)); | |
444 | if (brate == rate) { | |
b59066a2 JB |
445 | if (is_basic) |
446 | basic_rates |= BIT(j); | |
447 | break; | |
448 | } | |
449 | } | |
450 | } | |
451 | ||
8cef2c9d JB |
452 | rcu_read_lock(); |
453 | ies = rcu_dereference(cbss->ies); | |
454 | tsf = ies->tsf; | |
455 | rcu_read_unlock(); | |
456 | ||
0c1ad2ca | 457 | __ieee80211_sta_join_ibss(sdata, cbss->bssid, |
57c4d7b4 | 458 | beacon_int, |
75a423f4 | 459 | &chandef, |
b59066a2 | 460 | basic_rates, |
0c1ad2ca | 461 | cbss->capability, |
8cef2c9d | 462 | tsf, false); |
46900298 JB |
463 | } |
464 | ||
cd7760e6 SW |
465 | int ieee80211_ibss_csa_beacon(struct ieee80211_sub_if_data *sdata, |
466 | struct cfg80211_csa_settings *csa_settings) | |
467 | { | |
468 | struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; | |
469 | struct beacon_data *presp, *old_presp; | |
470 | struct cfg80211_bss *cbss; | |
471 | const struct cfg80211_bss_ies *ies; | |
472 | u16 capability; | |
473 | u64 tsf; | |
474 | int ret = 0; | |
475 | ||
476 | sdata_assert_lock(sdata); | |
477 | ||
478 | capability = WLAN_CAPABILITY_IBSS; | |
479 | ||
480 | if (ifibss->privacy) | |
481 | capability |= WLAN_CAPABILITY_PRIVACY; | |
482 | ||
483 | cbss = cfg80211_get_bss(sdata->local->hw.wiphy, ifibss->chandef.chan, | |
484 | ifibss->bssid, ifibss->ssid, | |
485 | ifibss->ssid_len, WLAN_CAPABILITY_IBSS | | |
486 | WLAN_CAPABILITY_PRIVACY, | |
487 | capability); | |
488 | ||
489 | if (WARN_ON(!cbss)) { | |
490 | ret = -EINVAL; | |
491 | goto out; | |
492 | } | |
493 | ||
494 | rcu_read_lock(); | |
495 | ies = rcu_dereference(cbss->ies); | |
496 | tsf = ies->tsf; | |
497 | rcu_read_unlock(); | |
498 | cfg80211_put_bss(sdata->local->hw.wiphy, cbss); | |
499 | ||
500 | old_presp = rcu_dereference_protected(ifibss->presp, | |
501 | lockdep_is_held(&sdata->wdev.mtx)); | |
502 | ||
503 | presp = ieee80211_ibss_build_presp(sdata, | |
504 | sdata->vif.bss_conf.beacon_int, | |
505 | sdata->vif.bss_conf.basic_rates, | |
506 | capability, tsf, &ifibss->chandef, | |
507 | NULL, csa_settings); | |
508 | if (!presp) { | |
509 | ret = -ENOMEM; | |
510 | goto out; | |
511 | } | |
512 | ||
513 | rcu_assign_pointer(ifibss->presp, presp); | |
514 | if (old_presp) | |
515 | kfree_rcu(old_presp, rcu_head); | |
516 | ||
dddd586b | 517 | return BSS_CHANGED_BEACON; |
cd7760e6 SW |
518 | out: |
519 | return ret; | |
520 | } | |
521 | ||
522 | int ieee80211_ibss_finish_csa(struct ieee80211_sub_if_data *sdata) | |
523 | { | |
524 | struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; | |
525 | struct cfg80211_bss *cbss; | |
faf046e7 | 526 | int err, changed = 0; |
cd7760e6 SW |
527 | u16 capability; |
528 | ||
bafdc614 SW |
529 | sdata_assert_lock(sdata); |
530 | ||
cd7760e6 SW |
531 | /* update cfg80211 bss information with the new channel */ |
532 | if (!is_zero_ether_addr(ifibss->bssid)) { | |
533 | capability = WLAN_CAPABILITY_IBSS; | |
534 | ||
535 | if (ifibss->privacy) | |
536 | capability |= WLAN_CAPABILITY_PRIVACY; | |
537 | ||
538 | cbss = cfg80211_get_bss(sdata->local->hw.wiphy, | |
539 | ifibss->chandef.chan, | |
540 | ifibss->bssid, ifibss->ssid, | |
541 | ifibss->ssid_len, WLAN_CAPABILITY_IBSS | | |
542 | WLAN_CAPABILITY_PRIVACY, | |
543 | capability); | |
544 | /* XXX: should not really modify cfg80211 data */ | |
545 | if (cbss) { | |
33787fc4 | 546 | cbss->channel = sdata->csa_chandef.chan; |
cd7760e6 SW |
547 | cfg80211_put_bss(sdata->local->hw.wiphy, cbss); |
548 | } | |
549 | } | |
550 | ||
33787fc4 | 551 | ifibss->chandef = sdata->csa_chandef; |
cd7760e6 SW |
552 | |
553 | /* generate the beacon */ | |
554 | err = ieee80211_ibss_csa_beacon(sdata, NULL); | |
cd7760e6 SW |
555 | if (err < 0) |
556 | return err; | |
557 | ||
faf046e7 | 558 | changed |= err; |
dddd586b | 559 | |
faf046e7 | 560 | return changed; |
cd7760e6 SW |
561 | } |
562 | ||
563 | void ieee80211_ibss_stop(struct ieee80211_sub_if_data *sdata) | |
564 | { | |
565 | struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; | |
566 | ||
567 | cancel_work_sync(&ifibss->csa_connection_drop_work); | |
568 | } | |
569 | ||
52874a5e | 570 | static struct sta_info *ieee80211_ibss_finish_sta(struct sta_info *sta) |
8bf11d8d JB |
571 | __acquires(RCU) |
572 | { | |
573 | struct ieee80211_sub_if_data *sdata = sta->sdata; | |
574 | u8 addr[ETH_ALEN]; | |
575 | ||
576 | memcpy(addr, sta->sta.addr, ETH_ALEN); | |
577 | ||
bdcbd8e0 | 578 | ibss_dbg(sdata, "Adding new IBSS station %pM\n", addr); |
8bf11d8d | 579 | |
83d5cc01 JB |
580 | sta_info_pre_move_state(sta, IEEE80211_STA_AUTH); |
581 | sta_info_pre_move_state(sta, IEEE80211_STA_ASSOC); | |
267335d6 AQ |
582 | /* authorize the station only if the network is not RSN protected. If |
583 | * not wait for the userspace to authorize it */ | |
584 | if (!sta->sdata->u.ibss.control_port) | |
585 | sta_info_pre_move_state(sta, IEEE80211_STA_AUTHORIZED); | |
8bf11d8d JB |
586 | |
587 | rate_control_rate_init(sta); | |
588 | ||
589 | /* If it fails, maybe we raced another insertion? */ | |
590 | if (sta_info_insert_rcu(sta)) | |
591 | return sta_info_get(sdata, addr); | |
592 | return sta; | |
593 | } | |
594 | ||
595 | static struct sta_info * | |
52874a5e AQ |
596 | ieee80211_ibss_add_sta(struct ieee80211_sub_if_data *sdata, const u8 *bssid, |
597 | const u8 *addr, u32 supp_rates) | |
8bf11d8d JB |
598 | __acquires(RCU) |
599 | { | |
600 | struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; | |
601 | struct ieee80211_local *local = sdata->local; | |
602 | struct sta_info *sta; | |
55de908a | 603 | struct ieee80211_chanctx_conf *chanctx_conf; |
b422c6cd | 604 | struct ieee80211_supported_band *sband; |
74608aca | 605 | enum nl80211_bss_scan_width scan_width; |
55de908a | 606 | int band; |
8bf11d8d JB |
607 | |
608 | /* | |
609 | * XXX: Consider removing the least recently used entry and | |
610 | * allow new one to be added. | |
611 | */ | |
612 | if (local->num_sta >= IEEE80211_IBSS_MAX_STA_ENTRIES) { | |
bdcbd8e0 | 613 | net_info_ratelimited("%s: No room for a new IBSS STA entry %pM\n", |
e87cc472 | 614 | sdata->name, addr); |
8bf11d8d JB |
615 | rcu_read_lock(); |
616 | return NULL; | |
617 | } | |
618 | ||
619 | if (ifibss->state == IEEE80211_IBSS_MLME_SEARCH) { | |
620 | rcu_read_lock(); | |
621 | return NULL; | |
622 | } | |
623 | ||
b203ca39 | 624 | if (!ether_addr_equal(bssid, sdata->u.ibss.bssid)) { |
8bf11d8d JB |
625 | rcu_read_lock(); |
626 | return NULL; | |
627 | } | |
628 | ||
55de908a JB |
629 | rcu_read_lock(); |
630 | chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); | |
631 | if (WARN_ON_ONCE(!chanctx_conf)) | |
632 | return NULL; | |
4bf88530 | 633 | band = chanctx_conf->def.chan->band; |
74608aca | 634 | scan_width = cfg80211_chandef_to_scan_width(&chanctx_conf->def); |
55de908a JB |
635 | rcu_read_unlock(); |
636 | ||
8bf11d8d JB |
637 | sta = sta_info_alloc(sdata, addr, GFP_KERNEL); |
638 | if (!sta) { | |
639 | rcu_read_lock(); | |
640 | return NULL; | |
641 | } | |
642 | ||
643 | sta->last_rx = jiffies; | |
644 | ||
645 | /* make sure mandatory rates are always added */ | |
b422c6cd | 646 | sband = local->hw.wiphy->bands[band]; |
8bf11d8d | 647 | sta->sta.supp_rates[band] = supp_rates | |
74608aca | 648 | ieee80211_mandatory_rates(sband, scan_width); |
8bf11d8d | 649 | |
52874a5e | 650 | return ieee80211_ibss_finish_sta(sta); |
6d810f10 AQ |
651 | } |
652 | ||
871a4180 SW |
653 | static int ieee80211_sta_active_ibss(struct ieee80211_sub_if_data *sdata) |
654 | { | |
655 | struct ieee80211_local *local = sdata->local; | |
656 | int active = 0; | |
657 | struct sta_info *sta; | |
658 | ||
659 | sdata_assert_lock(sdata); | |
660 | ||
661 | rcu_read_lock(); | |
662 | ||
663 | list_for_each_entry_rcu(sta, &local->sta_list, list) { | |
664 | if (sta->sdata == sdata && | |
665 | time_after(sta->last_rx + IEEE80211_IBSS_MERGE_INTERVAL, | |
666 | jiffies)) { | |
667 | active++; | |
668 | break; | |
669 | } | |
670 | } | |
671 | ||
672 | rcu_read_unlock(); | |
673 | ||
674 | return active; | |
675 | } | |
676 | ||
677 | static void ieee80211_ibss_disconnect(struct ieee80211_sub_if_data *sdata) | |
678 | { | |
679 | struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; | |
680 | struct ieee80211_local *local = sdata->local; | |
681 | struct cfg80211_bss *cbss; | |
682 | struct beacon_data *presp; | |
683 | struct sta_info *sta; | |
871a4180 SW |
684 | u16 capability; |
685 | ||
d4c80d9d | 686 | if (!is_zero_ether_addr(ifibss->bssid)) { |
871a4180 SW |
687 | capability = WLAN_CAPABILITY_IBSS; |
688 | ||
689 | if (ifibss->privacy) | |
690 | capability |= WLAN_CAPABILITY_PRIVACY; | |
691 | ||
692 | cbss = cfg80211_get_bss(local->hw.wiphy, ifibss->chandef.chan, | |
693 | ifibss->bssid, ifibss->ssid, | |
694 | ifibss->ssid_len, WLAN_CAPABILITY_IBSS | | |
695 | WLAN_CAPABILITY_PRIVACY, | |
696 | capability); | |
697 | ||
698 | if (cbss) { | |
699 | cfg80211_unlink_bss(local->hw.wiphy, cbss); | |
700 | cfg80211_put_bss(sdata->local->hw.wiphy, cbss); | |
701 | } | |
702 | } | |
703 | ||
704 | ifibss->state = IEEE80211_IBSS_MLME_SEARCH; | |
705 | ||
706 | sta_info_flush(sdata); | |
707 | ||
708 | spin_lock_bh(&ifibss->incomplete_lock); | |
709 | while (!list_empty(&ifibss->incomplete_stations)) { | |
710 | sta = list_first_entry(&ifibss->incomplete_stations, | |
711 | struct sta_info, list); | |
712 | list_del(&sta->list); | |
713 | spin_unlock_bh(&ifibss->incomplete_lock); | |
714 | ||
715 | sta_info_free(local, sta); | |
716 | spin_lock_bh(&ifibss->incomplete_lock); | |
717 | } | |
718 | spin_unlock_bh(&ifibss->incomplete_lock); | |
719 | ||
720 | netif_carrier_off(sdata->dev); | |
721 | ||
722 | sdata->vif.bss_conf.ibss_joined = false; | |
723 | sdata->vif.bss_conf.ibss_creator = false; | |
724 | sdata->vif.bss_conf.enable_beacon = false; | |
725 | sdata->vif.bss_conf.ssid_len = 0; | |
726 | ||
727 | /* remove beacon */ | |
728 | presp = rcu_dereference_protected(ifibss->presp, | |
729 | lockdep_is_held(&sdata->wdev.mtx)); | |
730 | RCU_INIT_POINTER(sdata->u.ibss.presp, NULL); | |
731 | if (presp) | |
732 | kfree_rcu(presp, rcu_head); | |
733 | ||
734 | clear_bit(SDATA_STATE_OFFCHANNEL_BEACON_STOPPED, &sdata->state); | |
735 | ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BEACON_ENABLED | | |
736 | BSS_CHANGED_IBSS); | |
55fff501 | 737 | drv_leave_ibss(local, sdata); |
34a3740d | 738 | mutex_lock(&local->mtx); |
871a4180 | 739 | ieee80211_vif_release_channel(sdata); |
34a3740d | 740 | mutex_unlock(&local->mtx); |
871a4180 SW |
741 | } |
742 | ||
cd7760e6 SW |
743 | static void ieee80211_csa_connection_drop_work(struct work_struct *work) |
744 | { | |
745 | struct ieee80211_sub_if_data *sdata = | |
746 | container_of(work, struct ieee80211_sub_if_data, | |
747 | u.ibss.csa_connection_drop_work); | |
748 | ||
6f07d216 LC |
749 | sdata_lock(sdata); |
750 | ||
cd7760e6 SW |
751 | ieee80211_ibss_disconnect(sdata); |
752 | synchronize_rcu(); | |
753 | skb_queue_purge(&sdata->skb_queue); | |
754 | ||
755 | /* trigger a scan to find another IBSS network to join */ | |
756 | ieee80211_queue_work(&sdata->local->hw, &sdata->work); | |
6f07d216 LC |
757 | |
758 | sdata_unlock(sdata); | |
cd7760e6 SW |
759 | } |
760 | ||
8e8d347d SW |
761 | static void ieee80211_ibss_csa_mark_radar(struct ieee80211_sub_if_data *sdata) |
762 | { | |
763 | struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; | |
764 | int err; | |
765 | ||
766 | /* if the current channel is a DFS channel, mark the channel as | |
767 | * unavailable. | |
768 | */ | |
769 | err = cfg80211_chandef_dfs_required(sdata->local->hw.wiphy, | |
2beb6dab LC |
770 | &ifibss->chandef, |
771 | NL80211_IFTYPE_ADHOC); | |
8e8d347d SW |
772 | if (err > 0) |
773 | cfg80211_radar_event(sdata->local->hw.wiphy, &ifibss->chandef, | |
774 | GFP_ATOMIC); | |
775 | } | |
776 | ||
cd7760e6 SW |
777 | static bool |
778 | ieee80211_ibss_process_chanswitch(struct ieee80211_sub_if_data *sdata, | |
779 | struct ieee802_11_elems *elems, | |
780 | bool beacon) | |
781 | { | |
782 | struct cfg80211_csa_settings params; | |
c0f17eb9 | 783 | struct ieee80211_csa_ie csa_ie; |
cd7760e6 | 784 | struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; |
cd7760e6 | 785 | enum nl80211_channel_type ch_type; |
82a8e17d | 786 | int err; |
cd7760e6 | 787 | u32 sta_flags; |
cd7760e6 | 788 | |
dbd72850 MK |
789 | sdata_assert_lock(sdata); |
790 | ||
cd7760e6 SW |
791 | sta_flags = IEEE80211_STA_DISABLE_VHT; |
792 | switch (ifibss->chandef.width) { | |
793 | case NL80211_CHAN_WIDTH_5: | |
794 | case NL80211_CHAN_WIDTH_10: | |
795 | case NL80211_CHAN_WIDTH_20_NOHT: | |
796 | sta_flags |= IEEE80211_STA_DISABLE_HT; | |
797 | /* fall through */ | |
798 | case NL80211_CHAN_WIDTH_20: | |
799 | sta_flags |= IEEE80211_STA_DISABLE_40MHZ; | |
800 | break; | |
801 | default: | |
802 | break; | |
803 | } | |
804 | ||
805 | memset(¶ms, 0, sizeof(params)); | |
c0f17eb9 | 806 | memset(&csa_ie, 0, sizeof(csa_ie)); |
cd7760e6 SW |
807 | err = ieee80211_parse_ch_switch_ie(sdata, elems, beacon, |
808 | ifibss->chandef.chan->band, | |
c0f17eb9 | 809 | sta_flags, ifibss->bssid, &csa_ie); |
cd7760e6 SW |
810 | /* can't switch to destination channel, fail */ |
811 | if (err < 0) | |
812 | goto disconnect; | |
813 | ||
814 | /* did not contain a CSA */ | |
815 | if (err) | |
816 | return false; | |
817 | ||
0834ae3c SW |
818 | /* channel switch is not supported, disconnect */ |
819 | if (!(sdata->local->hw.wiphy->flags & WIPHY_FLAG_HAS_CHANNEL_SWITCH)) | |
820 | goto disconnect; | |
821 | ||
c0f17eb9 CYY |
822 | params.count = csa_ie.count; |
823 | params.chandef = csa_ie.chandef; | |
824 | ||
cd7760e6 SW |
825 | switch (ifibss->chandef.width) { |
826 | case NL80211_CHAN_WIDTH_20_NOHT: | |
827 | case NL80211_CHAN_WIDTH_20: | |
828 | case NL80211_CHAN_WIDTH_40: | |
829 | /* keep our current HT mode (HT20/HT40+/HT40-), even if | |
830 | * another mode has been announced. The mode is not adopted | |
831 | * within the beacon while doing CSA and we should therefore | |
832 | * keep the mode which we announce. | |
833 | */ | |
834 | ch_type = cfg80211_get_chandef_type(&ifibss->chandef); | |
835 | cfg80211_chandef_create(¶ms.chandef, params.chandef.chan, | |
836 | ch_type); | |
837 | break; | |
838 | case NL80211_CHAN_WIDTH_5: | |
839 | case NL80211_CHAN_WIDTH_10: | |
840 | if (params.chandef.width != ifibss->chandef.width) { | |
841 | sdata_info(sdata, | |
842 | "IBSS %pM received channel switch from incompatible channel width (%d MHz, width:%d, CF1/2: %d/%d MHz), disconnecting\n", | |
843 | ifibss->bssid, | |
844 | params.chandef.chan->center_freq, | |
845 | params.chandef.width, | |
846 | params.chandef.center_freq1, | |
847 | params.chandef.center_freq2); | |
848 | goto disconnect; | |
849 | } | |
850 | break; | |
851 | default: | |
852 | /* should not happen, sta_flags should prevent VHT modes. */ | |
853 | WARN_ON(1); | |
854 | goto disconnect; | |
855 | } | |
856 | ||
174e0cd2 IP |
857 | if (!cfg80211_reg_can_beacon(sdata->local->hw.wiphy, ¶ms.chandef, |
858 | NL80211_IFTYPE_ADHOC)) { | |
cd7760e6 SW |
859 | sdata_info(sdata, |
860 | "IBSS %pM switches to unsupported channel (%d MHz, width:%d, CF1/2: %d/%d MHz), disconnecting\n", | |
861 | ifibss->bssid, | |
862 | params.chandef.chan->center_freq, | |
863 | params.chandef.width, | |
864 | params.chandef.center_freq1, | |
865 | params.chandef.center_freq2); | |
866 | goto disconnect; | |
867 | } | |
868 | ||
869 | err = cfg80211_chandef_dfs_required(sdata->local->hw.wiphy, | |
2beb6dab LC |
870 | ¶ms.chandef, |
871 | NL80211_IFTYPE_ADHOC); | |
cd7760e6 SW |
872 | if (err < 0) |
873 | goto disconnect; | |
2beb6dab | 874 | if (err > 0 && !ifibss->userspace_handles_dfs) { |
8e8d347d | 875 | /* IBSS-DFS only allowed with a control program */ |
2beb6dab | 876 | goto disconnect; |
cd7760e6 SW |
877 | } |
878 | ||
2beb6dab LC |
879 | params.radar_required = err; |
880 | ||
82a8e17d LC |
881 | if (cfg80211_chandef_identical(¶ms.chandef, |
882 | &sdata->vif.bss_conf.chandef)) { | |
883 | ibss_dbg(sdata, | |
884 | "received csa with an identical chandef, ignoring\n"); | |
885 | return true; | |
cd7760e6 | 886 | } |
cd7760e6 SW |
887 | |
888 | /* all checks done, now perform the channel switch. */ | |
889 | ibss_dbg(sdata, | |
890 | "received channel switch announcement to go to channel %d MHz\n", | |
891 | params.chandef.chan->center_freq); | |
892 | ||
c0f17eb9 | 893 | params.block_tx = !!csa_ie.mode; |
cd7760e6 | 894 | |
82a8e17d LC |
895 | if (ieee80211_channel_switch(sdata->local->hw.wiphy, sdata->dev, |
896 | ¶ms)) | |
897 | goto disconnect; | |
cd7760e6 | 898 | |
8e8d347d SW |
899 | ieee80211_ibss_csa_mark_radar(sdata); |
900 | ||
cd7760e6 SW |
901 | return true; |
902 | disconnect: | |
903 | ibss_dbg(sdata, "Can't handle channel switch, disconnect\n"); | |
904 | ieee80211_queue_work(&sdata->local->hw, | |
905 | &ifibss->csa_connection_drop_work); | |
906 | ||
8e8d347d SW |
907 | ieee80211_ibss_csa_mark_radar(sdata); |
908 | ||
cd7760e6 SW |
909 | return true; |
910 | } | |
911 | ||
912 | static void | |
913 | ieee80211_rx_mgmt_spectrum_mgmt(struct ieee80211_sub_if_data *sdata, | |
914 | struct ieee80211_mgmt *mgmt, size_t len, | |
915 | struct ieee80211_rx_status *rx_status, | |
916 | struct ieee802_11_elems *elems) | |
917 | { | |
918 | int required_len; | |
919 | ||
920 | if (len < IEEE80211_MIN_ACTION_SIZE + 1) | |
921 | return; | |
922 | ||
923 | /* CSA is the only action we handle for now */ | |
924 | if (mgmt->u.action.u.measurement.action_code != | |
925 | WLAN_ACTION_SPCT_CHL_SWITCH) | |
926 | return; | |
927 | ||
928 | required_len = IEEE80211_MIN_ACTION_SIZE + | |
929 | sizeof(mgmt->u.action.u.chan_switch); | |
930 | if (len < required_len) | |
931 | return; | |
932 | ||
82a8e17d LC |
933 | if (!sdata->vif.csa_active) |
934 | ieee80211_ibss_process_chanswitch(sdata, elems, false); | |
cd7760e6 SW |
935 | } |
936 | ||
2cc59e78 AQ |
937 | static void ieee80211_rx_mgmt_deauth_ibss(struct ieee80211_sub_if_data *sdata, |
938 | struct ieee80211_mgmt *mgmt, | |
939 | size_t len) | |
940 | { | |
941 | u16 reason = le16_to_cpu(mgmt->u.deauth.reason_code); | |
942 | ||
943 | if (len < IEEE80211_DEAUTH_FRAME_LEN) | |
944 | return; | |
945 | ||
946 | ibss_dbg(sdata, "RX DeAuth SA=%pM DA=%pM BSSID=%pM (reason: %d)\n", | |
947 | mgmt->sa, mgmt->da, mgmt->bssid, reason); | |
948 | sta_info_destroy_addr(sdata, mgmt->sa); | |
949 | } | |
950 | ||
6d810f10 AQ |
951 | static void ieee80211_rx_mgmt_auth_ibss(struct ieee80211_sub_if_data *sdata, |
952 | struct ieee80211_mgmt *mgmt, | |
953 | size_t len) | |
954 | { | |
955 | u16 auth_alg, auth_transaction; | |
956 | ||
8d61ffa5 | 957 | sdata_assert_lock(sdata); |
6d810f10 AQ |
958 | |
959 | if (len < 24 + 6) | |
960 | return; | |
961 | ||
962 | auth_alg = le16_to_cpu(mgmt->u.auth.auth_alg); | |
963 | auth_transaction = le16_to_cpu(mgmt->u.auth.auth_transaction); | |
964 | ||
bdcbd8e0 JB |
965 | ibss_dbg(sdata, |
966 | "RX Auth SA=%pM DA=%pM BSSID=%pM (auth_transaction=%d)\n", | |
967 | mgmt->sa, mgmt->da, mgmt->bssid, auth_transaction); | |
7bed2050 AQ |
968 | |
969 | if (auth_alg != WLAN_AUTH_OPEN || auth_transaction != 1) | |
970 | return; | |
971 | ||
6d810f10 AQ |
972 | /* |
973 | * IEEE 802.11 standard does not require authentication in IBSS | |
974 | * networks and most implementations do not seem to use it. | |
975 | * However, try to reply to authentication attempts if someone | |
976 | * has actually implemented this. | |
977 | */ | |
700e8ea6 | 978 | ieee80211_send_auth(sdata, 2, WLAN_AUTH_OPEN, 0, NULL, 0, |
1672c0e3 | 979 | mgmt->sa, sdata->u.ibss.bssid, NULL, 0, 0, 0); |
8bf11d8d JB |
980 | } |
981 | ||
46900298 | 982 | static void ieee80211_rx_bss_info(struct ieee80211_sub_if_data *sdata, |
d45c4172 | 983 | struct ieee80211_mgmt *mgmt, size_t len, |
46900298 | 984 | struct ieee80211_rx_status *rx_status, |
d45c4172 | 985 | struct ieee802_11_elems *elems) |
46900298 JB |
986 | { |
987 | struct ieee80211_local *local = sdata->local; | |
0c1ad2ca | 988 | struct cfg80211_bss *cbss; |
46900298 JB |
989 | struct ieee80211_bss *bss; |
990 | struct sta_info *sta; | |
991 | struct ieee80211_channel *channel; | |
992 | u64 beacon_timestamp, rx_timestamp; | |
993 | u32 supp_rates = 0; | |
994 | enum ieee80211_band band = rx_status->band; | |
74608aca | 995 | enum nl80211_bss_scan_width scan_width; |
13c40c54 AS |
996 | struct ieee80211_supported_band *sband = local->hw.wiphy->bands[band]; |
997 | bool rates_updated = false; | |
46900298 | 998 | |
3afc2167 EG |
999 | channel = ieee80211_get_channel(local->hw.wiphy, rx_status->freq); |
1000 | if (!channel) | |
46900298 JB |
1001 | return; |
1002 | ||
9eba6125 | 1003 | if (sdata->vif.type == NL80211_IFTYPE_ADHOC && |
b203ca39 | 1004 | ether_addr_equal(mgmt->bssid, sdata->u.ibss.bssid)) { |
46900298 JB |
1005 | |
1006 | rcu_read_lock(); | |
abe60632 | 1007 | sta = sta_info_get(sdata, mgmt->sa); |
46900298 | 1008 | |
9eba6125 | 1009 | if (elems->supp_rates) { |
2103dec1 | 1010 | supp_rates = ieee80211_sta_get_rates(sdata, elems, |
9ebb61a2 | 1011 | band, NULL); |
9eba6125 BR |
1012 | if (sta) { |
1013 | u32 prev_rates; | |
1014 | ||
1015 | prev_rates = sta->sta.supp_rates[band]; | |
1016 | /* make sure mandatory rates are always added */ | |
74608aca SW |
1017 | scan_width = NL80211_BSS_CHAN_WIDTH_20; |
1018 | if (rx_status->flag & RX_FLAG_5MHZ) | |
1019 | scan_width = NL80211_BSS_CHAN_WIDTH_5; | |
1020 | if (rx_status->flag & RX_FLAG_10MHZ) | |
1021 | scan_width = NL80211_BSS_CHAN_WIDTH_10; | |
46900298 | 1022 | |
74608aca SW |
1023 | sta->sta.supp_rates[band] = supp_rates | |
1024 | ieee80211_mandatory_rates(sband, | |
1025 | scan_width); | |
9eba6125 | 1026 | if (sta->sta.supp_rates[band] != prev_rates) { |
bdcbd8e0 JB |
1027 | ibss_dbg(sdata, |
1028 | "updated supp_rates set for %pM based on beacon/probe_resp (0x%x -> 0x%x)\n", | |
1029 | sta->sta.addr, prev_rates, | |
1030 | sta->sta.supp_rates[band]); | |
13c40c54 | 1031 | rates_updated = true; |
9eba6125 | 1032 | } |
8bf11d8d JB |
1033 | } else { |
1034 | rcu_read_unlock(); | |
9eba6125 | 1035 | sta = ieee80211_ibss_add_sta(sdata, mgmt->bssid, |
52874a5e | 1036 | mgmt->sa, supp_rates); |
8bf11d8d | 1037 | } |
34e89507 | 1038 | } |
9eba6125 BR |
1039 | |
1040 | if (sta && elems->wmm_info) | |
c2c98fde | 1041 | set_sta_flag(sta, WLAN_STA_WME); |
9eba6125 | 1042 | |
074d46d1 | 1043 | if (sta && elems->ht_operation && elems->ht_cap_elem && |
3aede78a SW |
1044 | sdata->u.ibss.chandef.width != NL80211_CHAN_WIDTH_20_NOHT && |
1045 | sdata->u.ibss.chandef.width != NL80211_CHAN_WIDTH_5 && | |
1046 | sdata->u.ibss.chandef.width != NL80211_CHAN_WIDTH_10) { | |
13c40c54 | 1047 | /* we both use HT */ |
e1a0c6b3 | 1048 | struct ieee80211_ht_cap htcap_ie; |
4bf88530 JB |
1049 | struct cfg80211_chan_def chandef; |
1050 | ||
1051 | ieee80211_ht_oper_to_chandef(channel, | |
1052 | elems->ht_operation, | |
1053 | &chandef); | |
13c40c54 | 1054 | |
e1a0c6b3 | 1055 | memcpy(&htcap_ie, elems->ht_cap_elem, sizeof(htcap_ie)); |
13c40c54 AS |
1056 | |
1057 | /* | |
1058 | * fall back to HT20 if we don't use or use | |
1059 | * the other extension channel | |
1060 | */ | |
3aede78a SW |
1061 | if (chandef.center_freq1 != |
1062 | sdata->u.ibss.chandef.center_freq1) | |
e1a0c6b3 JB |
1063 | htcap_ie.cap_info &= |
1064 | cpu_to_le16(~IEEE80211_HT_CAP_SUP_WIDTH_20_40); | |
1065 | ||
1066 | rates_updated |= ieee80211_ht_cap_ie_to_sta_ht_cap( | |
1067 | sdata, sband, &htcap_ie, sta); | |
13c40c54 AS |
1068 | } |
1069 | ||
e687f61e AQ |
1070 | if (sta && rates_updated) { |
1071 | drv_sta_rc_update(local, sdata, &sta->sta, | |
1072 | IEEE80211_RC_SUPP_RATES_CHANGED); | |
13c40c54 | 1073 | rate_control_rate_init(sta); |
e687f61e | 1074 | } |
13c40c54 | 1075 | |
9eba6125 | 1076 | rcu_read_unlock(); |
46900298 JB |
1077 | } |
1078 | ||
1079 | bss = ieee80211_bss_info_update(local, rx_status, mgmt, len, elems, | |
d45c4172 | 1080 | channel); |
46900298 JB |
1081 | if (!bss) |
1082 | return; | |
1083 | ||
0c1ad2ca JB |
1084 | cbss = container_of((void *)bss, struct cfg80211_bss, priv); |
1085 | ||
8cef2c9d JB |
1086 | /* same for beacon and probe response */ |
1087 | beacon_timestamp = le64_to_cpu(mgmt->u.beacon.timestamp); | |
46900298 JB |
1088 | |
1089 | /* check if we need to merge IBSS */ | |
1090 | ||
46900298 | 1091 | /* not an IBSS */ |
0c1ad2ca | 1092 | if (!(cbss->capability & WLAN_CAPABILITY_IBSS)) |
46900298 JB |
1093 | goto put_bss; |
1094 | ||
1095 | /* different channel */ | |
55de908a | 1096 | if (sdata->u.ibss.fixed_channel && |
3aede78a | 1097 | sdata->u.ibss.chandef.chan != cbss->channel) |
46900298 JB |
1098 | goto put_bss; |
1099 | ||
1100 | /* different SSID */ | |
1101 | if (elems->ssid_len != sdata->u.ibss.ssid_len || | |
1102 | memcmp(elems->ssid, sdata->u.ibss.ssid, | |
1103 | sdata->u.ibss.ssid_len)) | |
1104 | goto put_bss; | |
1105 | ||
cd7760e6 | 1106 | /* process channel switch */ |
82a8e17d LC |
1107 | if (sdata->vif.csa_active || |
1108 | ieee80211_ibss_process_chanswitch(sdata, elems, true)) | |
cd7760e6 SW |
1109 | goto put_bss; |
1110 | ||
34e8f082 | 1111 | /* same BSSID */ |
b203ca39 | 1112 | if (ether_addr_equal(cbss->bssid, sdata->u.ibss.bssid)) |
34e8f082 AF |
1113 | goto put_bss; |
1114 | ||
cd7760e6 SW |
1115 | /* we use a fixed BSSID */ |
1116 | if (sdata->u.ibss.fixed_bssid) | |
1117 | goto put_bss; | |
1118 | ||
f4bda337 TP |
1119 | if (ieee80211_have_rx_timestamp(rx_status)) { |
1120 | /* time when timestamp field was received */ | |
1121 | rx_timestamp = | |
1122 | ieee80211_calculate_rx_timestamp(local, rx_status, | |
1123 | len + FCS_LEN, 24); | |
24487981 JB |
1124 | } else { |
1125 | /* | |
1126 | * second best option: get current TSF | |
1127 | * (will return -1 if not supported) | |
1128 | */ | |
37a41b4a | 1129 | rx_timestamp = drv_get_tsf(local, sdata); |
24487981 | 1130 | } |
46900298 | 1131 | |
bdcbd8e0 JB |
1132 | ibss_dbg(sdata, |
1133 | "RX beacon SA=%pM BSSID=%pM TSF=0x%llx BCN=0x%llx diff=%lld @%lu\n", | |
1134 | mgmt->sa, mgmt->bssid, | |
1135 | (unsigned long long)rx_timestamp, | |
1136 | (unsigned long long)beacon_timestamp, | |
1137 | (unsigned long long)(rx_timestamp - beacon_timestamp), | |
1138 | jiffies); | |
46900298 JB |
1139 | |
1140 | if (beacon_timestamp > rx_timestamp) { | |
bdcbd8e0 JB |
1141 | ibss_dbg(sdata, |
1142 | "beacon TSF higher than local TSF - IBSS merge with BSSID %pM\n", | |
1143 | mgmt->bssid); | |
46900298 | 1144 | ieee80211_sta_join_ibss(sdata, bss); |
2103dec1 | 1145 | supp_rates = ieee80211_sta_get_rates(sdata, elems, band, NULL); |
34e89507 | 1146 | ieee80211_ibss_add_sta(sdata, mgmt->bssid, mgmt->sa, |
52874a5e | 1147 | supp_rates); |
8bf11d8d | 1148 | rcu_read_unlock(); |
46900298 JB |
1149 | } |
1150 | ||
1151 | put_bss: | |
1152 | ieee80211_rx_bss_put(local, bss); | |
1153 | } | |
1154 | ||
8bf11d8d JB |
1155 | void ieee80211_ibss_rx_no_sta(struct ieee80211_sub_if_data *sdata, |
1156 | const u8 *bssid, const u8 *addr, | |
1157 | u32 supp_rates) | |
46900298 | 1158 | { |
2e10d330 | 1159 | struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; |
46900298 JB |
1160 | struct ieee80211_local *local = sdata->local; |
1161 | struct sta_info *sta; | |
55de908a | 1162 | struct ieee80211_chanctx_conf *chanctx_conf; |
b422c6cd | 1163 | struct ieee80211_supported_band *sband; |
74608aca | 1164 | enum nl80211_bss_scan_width scan_width; |
55de908a | 1165 | int band; |
46900298 | 1166 | |
af8cdcd8 JB |
1167 | /* |
1168 | * XXX: Consider removing the least recently used entry and | |
1169 | * allow new one to be added. | |
1170 | */ | |
46900298 | 1171 | if (local->num_sta >= IEEE80211_IBSS_MAX_STA_ENTRIES) { |
bdcbd8e0 | 1172 | net_info_ratelimited("%s: No room for a new IBSS STA entry %pM\n", |
e87cc472 | 1173 | sdata->name, addr); |
8bf11d8d | 1174 | return; |
46900298 JB |
1175 | } |
1176 | ||
2e10d330 | 1177 | if (ifibss->state == IEEE80211_IBSS_MLME_SEARCH) |
8bf11d8d | 1178 | return; |
2e10d330 | 1179 | |
b203ca39 | 1180 | if (!ether_addr_equal(bssid, sdata->u.ibss.bssid)) |
8bf11d8d | 1181 | return; |
46900298 | 1182 | |
55de908a JB |
1183 | rcu_read_lock(); |
1184 | chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); | |
1185 | if (WARN_ON_ONCE(!chanctx_conf)) { | |
1186 | rcu_read_unlock(); | |
1187 | return; | |
1188 | } | |
4bf88530 | 1189 | band = chanctx_conf->def.chan->band; |
74608aca | 1190 | scan_width = cfg80211_chandef_to_scan_width(&chanctx_conf->def); |
55de908a JB |
1191 | rcu_read_unlock(); |
1192 | ||
8bf11d8d | 1193 | sta = sta_info_alloc(sdata, addr, GFP_ATOMIC); |
46900298 | 1194 | if (!sta) |
8bf11d8d | 1195 | return; |
46900298 | 1196 | |
c8716d9d | 1197 | sta->last_rx = jiffies; |
d9a7ddb0 | 1198 | |
46900298 | 1199 | /* make sure mandatory rates are always added */ |
b422c6cd | 1200 | sband = local->hw.wiphy->bands[band]; |
46900298 | 1201 | sta->sta.supp_rates[band] = supp_rates | |
74608aca | 1202 | ieee80211_mandatory_rates(sband, scan_width); |
46900298 | 1203 | |
8bf11d8d JB |
1204 | spin_lock(&ifibss->incomplete_lock); |
1205 | list_add(&sta->list, &ifibss->incomplete_stations); | |
1206 | spin_unlock(&ifibss->incomplete_lock); | |
1207 | ieee80211_queue_work(&local->hw, &sdata->work); | |
46900298 JB |
1208 | } |
1209 | ||
dad9defd AQ |
1210 | static void ieee80211_ibss_sta_expire(struct ieee80211_sub_if_data *sdata) |
1211 | { | |
1212 | struct ieee80211_local *local = sdata->local; | |
1213 | struct sta_info *sta, *tmp; | |
1214 | unsigned long exp_time = IEEE80211_IBSS_INACTIVITY_LIMIT; | |
1215 | unsigned long exp_rsn_time = IEEE80211_IBSS_RSN_INACTIVITY_LIMIT; | |
1216 | ||
1217 | mutex_lock(&local->sta_mtx); | |
1218 | ||
1219 | list_for_each_entry_safe(sta, tmp, &local->sta_list, list) { | |
1220 | if (sdata != sta->sdata) | |
1221 | continue; | |
1222 | ||
1223 | if (time_after(jiffies, sta->last_rx + exp_time) || | |
1224 | (time_after(jiffies, sta->last_rx + exp_rsn_time) && | |
1225 | sta->sta_state != IEEE80211_STA_AUTHORIZED)) { | |
1226 | sta_dbg(sta->sdata, "expiring inactive %sSTA %pM\n", | |
1227 | sta->sta_state != IEEE80211_STA_AUTHORIZED ? | |
1228 | "not authorized " : "", sta->sta.addr); | |
1229 | ||
1230 | WARN_ON(__sta_info_destroy(sta)); | |
1231 | } | |
1232 | } | |
1233 | ||
1234 | mutex_unlock(&local->sta_mtx); | |
1235 | } | |
1236 | ||
ce9058ae BP |
1237 | /* |
1238 | * This function is called with state == IEEE80211_IBSS_MLME_JOINED | |
1239 | */ | |
46900298 JB |
1240 | |
1241 | static void ieee80211_sta_merge_ibss(struct ieee80211_sub_if_data *sdata) | |
1242 | { | |
1243 | struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; | |
7ca15a0a | 1244 | enum nl80211_bss_scan_width scan_width; |
46900298 | 1245 | |
8d61ffa5 | 1246 | sdata_assert_lock(sdata); |
7a17a33c | 1247 | |
af8cdcd8 JB |
1248 | mod_timer(&ifibss->timer, |
1249 | round_jiffies(jiffies + IEEE80211_IBSS_MERGE_INTERVAL)); | |
46900298 | 1250 | |
dad9defd | 1251 | ieee80211_ibss_sta_expire(sdata); |
af8cdcd8 | 1252 | |
450aae3d S |
1253 | if (time_before(jiffies, ifibss->last_scan_completed + |
1254 | IEEE80211_IBSS_MERGE_INTERVAL)) | |
1255 | return; | |
1256 | ||
46900298 JB |
1257 | if (ieee80211_sta_active_ibss(sdata)) |
1258 | return; | |
1259 | ||
c037b836 | 1260 | if (ifibss->fixed_channel) |
46900298 JB |
1261 | return; |
1262 | ||
bdcbd8e0 JB |
1263 | sdata_info(sdata, |
1264 | "No active IBSS STAs - trying to scan for other IBSS networks with same SSID (merge)\n"); | |
46900298 | 1265 | |
7ca15a0a | 1266 | scan_width = cfg80211_chandef_to_scan_width(&ifibss->chandef); |
34bcf715 | 1267 | ieee80211_request_ibss_scan(sdata, ifibss->ssid, ifibss->ssid_len, |
7ca15a0a | 1268 | NULL, scan_width); |
46900298 JB |
1269 | } |
1270 | ||
af8cdcd8 | 1271 | static void ieee80211_sta_create_ibss(struct ieee80211_sub_if_data *sdata) |
46900298 JB |
1272 | { |
1273 | struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; | |
46900298 | 1274 | u8 bssid[ETH_ALEN]; |
46900298 JB |
1275 | u16 capability; |
1276 | int i; | |
1277 | ||
8d61ffa5 | 1278 | sdata_assert_lock(sdata); |
7a17a33c | 1279 | |
af8cdcd8 | 1280 | if (ifibss->fixed_bssid) { |
46900298 JB |
1281 | memcpy(bssid, ifibss->bssid, ETH_ALEN); |
1282 | } else { | |
1283 | /* Generate random, not broadcast, locally administered BSSID. Mix in | |
1284 | * own MAC address to make sure that devices that do not have proper | |
1285 | * random number generator get different BSSID. */ | |
1286 | get_random_bytes(bssid, ETH_ALEN); | |
1287 | for (i = 0; i < ETH_ALEN; i++) | |
47846c9b | 1288 | bssid[i] ^= sdata->vif.addr[i]; |
46900298 JB |
1289 | bssid[0] &= ~0x01; |
1290 | bssid[0] |= 0x02; | |
1291 | } | |
1292 | ||
bdcbd8e0 | 1293 | sdata_info(sdata, "Creating new IBSS network, BSSID %pM\n", bssid); |
46900298 | 1294 | |
46900298 JB |
1295 | capability = WLAN_CAPABILITY_IBSS; |
1296 | ||
fffd0934 | 1297 | if (ifibss->privacy) |
46900298 JB |
1298 | capability |= WLAN_CAPABILITY_PRIVACY; |
1299 | else | |
1300 | sdata->drop_unencrypted = 0; | |
1301 | ||
57c4d7b4 | 1302 | __ieee80211_sta_join_ibss(sdata, bssid, sdata->vif.bss_conf.beacon_int, |
75a423f4 | 1303 | &ifibss->chandef, ifibss->basic_rates, |
c13a765b | 1304 | capability, 0, true); |
46900298 JB |
1305 | } |
1306 | ||
ce9058ae BP |
1307 | /* |
1308 | * This function is called with state == IEEE80211_IBSS_MLME_SEARCH | |
1309 | */ | |
1310 | ||
af8cdcd8 | 1311 | static void ieee80211_sta_find_ibss(struct ieee80211_sub_if_data *sdata) |
46900298 JB |
1312 | { |
1313 | struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; | |
1314 | struct ieee80211_local *local = sdata->local; | |
0c1ad2ca | 1315 | struct cfg80211_bss *cbss; |
af8cdcd8 | 1316 | struct ieee80211_channel *chan = NULL; |
46900298 | 1317 | const u8 *bssid = NULL; |
7ca15a0a | 1318 | enum nl80211_bss_scan_width scan_width; |
46900298 | 1319 | int active_ibss; |
e0d61887 | 1320 | u16 capability; |
46900298 | 1321 | |
8d61ffa5 | 1322 | sdata_assert_lock(sdata); |
7a17a33c | 1323 | |
46900298 | 1324 | active_ibss = ieee80211_sta_active_ibss(sdata); |
bdcbd8e0 | 1325 | ibss_dbg(sdata, "sta_find_ibss (active_ibss=%d)\n", active_ibss); |
46900298 JB |
1326 | |
1327 | if (active_ibss) | |
af8cdcd8 | 1328 | return; |
46900298 | 1329 | |
e0d61887 | 1330 | capability = WLAN_CAPABILITY_IBSS; |
fffd0934 | 1331 | if (ifibss->privacy) |
e0d61887 | 1332 | capability |= WLAN_CAPABILITY_PRIVACY; |
af8cdcd8 JB |
1333 | if (ifibss->fixed_bssid) |
1334 | bssid = ifibss->bssid; | |
1335 | if (ifibss->fixed_channel) | |
3aede78a | 1336 | chan = ifibss->chandef.chan; |
af8cdcd8 | 1337 | if (!is_zero_ether_addr(ifibss->bssid)) |
46900298 | 1338 | bssid = ifibss->bssid; |
0c1ad2ca JB |
1339 | cbss = cfg80211_get_bss(local->hw.wiphy, chan, bssid, |
1340 | ifibss->ssid, ifibss->ssid_len, | |
1341 | WLAN_CAPABILITY_IBSS | WLAN_CAPABILITY_PRIVACY, | |
1342 | capability); | |
1343 | ||
1344 | if (cbss) { | |
1345 | struct ieee80211_bss *bss; | |
46900298 | 1346 | |
0c1ad2ca | 1347 | bss = (void *)cbss->priv; |
bdcbd8e0 JB |
1348 | ibss_dbg(sdata, |
1349 | "sta_find_ibss: selected %pM current %pM\n", | |
1350 | cbss->bssid, ifibss->bssid); | |
1351 | sdata_info(sdata, | |
1352 | "Selected IBSS BSSID %pM based on configured SSID\n", | |
1353 | cbss->bssid); | |
46900298 | 1354 | |
af8cdcd8 | 1355 | ieee80211_sta_join_ibss(sdata, bss); |
46900298 | 1356 | ieee80211_rx_bss_put(local, bss); |
af8cdcd8 | 1357 | return; |
d419b9f0 | 1358 | } |
46900298 | 1359 | |
d8eb741e AQ |
1360 | /* if a fixed bssid and a fixed freq have been provided create the IBSS |
1361 | * directly and do not waste time scanning | |
1362 | */ | |
1363 | if (ifibss->fixed_bssid && ifibss->fixed_channel) { | |
1364 | sdata_info(sdata, "Created IBSS using preconfigured BSSID %pM\n", | |
1365 | bssid); | |
1366 | ieee80211_sta_create_ibss(sdata); | |
1367 | return; | |
1368 | } | |
1369 | ||
1370 | ||
bdcbd8e0 | 1371 | ibss_dbg(sdata, "sta_find_ibss: did not try to join ibss\n"); |
46900298 JB |
1372 | |
1373 | /* Selected IBSS not found in current scan results - try to scan */ | |
ce9058ae | 1374 | if (time_after(jiffies, ifibss->last_scan_completed + |
46900298 | 1375 | IEEE80211_SCAN_INTERVAL)) { |
bdcbd8e0 | 1376 | sdata_info(sdata, "Trigger new scan to find an IBSS to join\n"); |
46900298 | 1377 | |
7ca15a0a | 1378 | scan_width = cfg80211_chandef_to_scan_width(&ifibss->chandef); |
34bcf715 | 1379 | ieee80211_request_ibss_scan(sdata, ifibss->ssid, |
7ca15a0a SW |
1380 | ifibss->ssid_len, chan, |
1381 | scan_width); | |
ce9058ae | 1382 | } else { |
46900298 JB |
1383 | int interval = IEEE80211_SCAN_INTERVAL; |
1384 | ||
1385 | if (time_after(jiffies, ifibss->ibss_join_req + | |
55de908a JB |
1386 | IEEE80211_IBSS_JOIN_TIMEOUT)) |
1387 | ieee80211_sta_create_ibss(sdata); | |
46900298 | 1388 | |
af8cdcd8 JB |
1389 | mod_timer(&ifibss->timer, |
1390 | round_jiffies(jiffies + interval)); | |
46900298 | 1391 | } |
46900298 JB |
1392 | } |
1393 | ||
1394 | static void ieee80211_rx_mgmt_probe_req(struct ieee80211_sub_if_data *sdata, | |
c269a203 | 1395 | struct sk_buff *req) |
46900298 | 1396 | { |
c269a203 | 1397 | struct ieee80211_mgmt *mgmt = (void *)req->data; |
46900298 JB |
1398 | struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; |
1399 | struct ieee80211_local *local = sdata->local; | |
c269a203 | 1400 | int tx_last_beacon, len = req->len; |
46900298 | 1401 | struct sk_buff *skb; |
c3ffeab4 | 1402 | struct beacon_data *presp; |
46900298 JB |
1403 | u8 *pos, *end; |
1404 | ||
8d61ffa5 | 1405 | sdata_assert_lock(sdata); |
7a17a33c | 1406 | |
40b275b6 | 1407 | presp = rcu_dereference_protected(ifibss->presp, |
8d61ffa5 | 1408 | lockdep_is_held(&sdata->wdev.mtx)); |
40b275b6 | 1409 | |
46900298 | 1410 | if (ifibss->state != IEEE80211_IBSS_MLME_JOINED || |
40b275b6 | 1411 | len < 24 + 2 || !presp) |
46900298 JB |
1412 | return; |
1413 | ||
24487981 | 1414 | tx_last_beacon = drv_tx_last_beacon(local); |
46900298 | 1415 | |
bdcbd8e0 JB |
1416 | ibss_dbg(sdata, |
1417 | "RX ProbeReq SA=%pM DA=%pM BSSID=%pM (tx_last_beacon=%d)\n", | |
1418 | mgmt->sa, mgmt->da, mgmt->bssid, tx_last_beacon); | |
46900298 | 1419 | |
1ed76487 | 1420 | if (!tx_last_beacon && is_multicast_ether_addr(mgmt->da)) |
46900298 JB |
1421 | return; |
1422 | ||
b203ca39 | 1423 | if (!ether_addr_equal(mgmt->bssid, ifibss->bssid) && |
888d04df | 1424 | !is_broadcast_ether_addr(mgmt->bssid)) |
46900298 JB |
1425 | return; |
1426 | ||
1427 | end = ((u8 *) mgmt) + len; | |
1428 | pos = mgmt->u.probe_req.variable; | |
1429 | if (pos[0] != WLAN_EID_SSID || | |
1430 | pos + 2 + pos[1] > end) { | |
bdcbd8e0 JB |
1431 | ibss_dbg(sdata, "Invalid SSID IE in ProbeReq from %pM\n", |
1432 | mgmt->sa); | |
46900298 JB |
1433 | return; |
1434 | } | |
1435 | if (pos[1] != 0 && | |
1436 | (pos[1] != ifibss->ssid_len || | |
0da780c2 | 1437 | memcmp(pos + 2, ifibss->ssid, ifibss->ssid_len))) { |
46900298 JB |
1438 | /* Ignore ProbeReq for foreign SSID */ |
1439 | return; | |
1440 | } | |
1441 | ||
1442 | /* Reply with ProbeResp */ | |
c3ffeab4 | 1443 | skb = dev_alloc_skb(local->tx_headroom + presp->head_len); |
46900298 JB |
1444 | if (!skb) |
1445 | return; | |
1446 | ||
c3ffeab4 JB |
1447 | skb_reserve(skb, local->tx_headroom); |
1448 | memcpy(skb_put(skb, presp->head_len), presp->head, presp->head_len); | |
1449 | ||
1450 | memcpy(((struct ieee80211_mgmt *) skb->data)->da, mgmt->sa, ETH_ALEN); | |
1451 | ibss_dbg(sdata, "Sending ProbeResp to %pM\n", mgmt->sa); | |
62ae67be | 1452 | IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT; |
691eb61b SW |
1453 | |
1454 | /* avoid excessive retries for probe request to wildcard SSIDs */ | |
1455 | if (pos[1] == 0) | |
1456 | IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_CTL_NO_ACK; | |
1457 | ||
62ae67be | 1458 | ieee80211_tx_skb(sdata, skb); |
46900298 JB |
1459 | } |
1460 | ||
d45c4172 EG |
1461 | static |
1462 | void ieee80211_rx_mgmt_probe_beacon(struct ieee80211_sub_if_data *sdata, | |
1463 | struct ieee80211_mgmt *mgmt, size_t len, | |
1464 | struct ieee80211_rx_status *rx_status) | |
46900298 JB |
1465 | { |
1466 | size_t baselen; | |
1467 | struct ieee802_11_elems elems; | |
1468 | ||
d45c4172 EG |
1469 | BUILD_BUG_ON(offsetof(typeof(mgmt->u.probe_resp), variable) != |
1470 | offsetof(typeof(mgmt->u.beacon), variable)); | |
1471 | ||
1472 | /* | |
1473 | * either beacon or probe_resp but the variable field is at the | |
1474 | * same offset | |
1475 | */ | |
46900298 JB |
1476 | baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt; |
1477 | if (baselen > len) | |
1478 | return; | |
1479 | ||
1480 | ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen, | |
b2e506bf | 1481 | false, &elems); |
46900298 | 1482 | |
d45c4172 | 1483 | ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems); |
46900298 JB |
1484 | } |
1485 | ||
1fa57d01 JB |
1486 | void ieee80211_ibss_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata, |
1487 | struct sk_buff *skb) | |
46900298 JB |
1488 | { |
1489 | struct ieee80211_rx_status *rx_status; | |
1490 | struct ieee80211_mgmt *mgmt; | |
1491 | u16 fc; | |
cd7760e6 SW |
1492 | struct ieee802_11_elems elems; |
1493 | int ies_len; | |
46900298 | 1494 | |
f1d58c25 | 1495 | rx_status = IEEE80211_SKB_RXCB(skb); |
46900298 JB |
1496 | mgmt = (struct ieee80211_mgmt *) skb->data; |
1497 | fc = le16_to_cpu(mgmt->frame_control); | |
1498 | ||
8d61ffa5 | 1499 | sdata_lock(sdata); |
7a17a33c | 1500 | |
c926d006 TH |
1501 | if (!sdata->u.ibss.ssid_len) |
1502 | goto mgmt_out; /* not ready to merge yet */ | |
1503 | ||
46900298 JB |
1504 | switch (fc & IEEE80211_FCTL_STYPE) { |
1505 | case IEEE80211_STYPE_PROBE_REQ: | |
c269a203 | 1506 | ieee80211_rx_mgmt_probe_req(sdata, skb); |
46900298 JB |
1507 | break; |
1508 | case IEEE80211_STYPE_PROBE_RESP: | |
46900298 | 1509 | case IEEE80211_STYPE_BEACON: |
d45c4172 EG |
1510 | ieee80211_rx_mgmt_probe_beacon(sdata, mgmt, skb->len, |
1511 | rx_status); | |
46900298 JB |
1512 | break; |
1513 | case IEEE80211_STYPE_AUTH: | |
1514 | ieee80211_rx_mgmt_auth_ibss(sdata, mgmt, skb->len); | |
1515 | break; | |
2cc59e78 AQ |
1516 | case IEEE80211_STYPE_DEAUTH: |
1517 | ieee80211_rx_mgmt_deauth_ibss(sdata, mgmt, skb->len); | |
1518 | break; | |
cd7760e6 SW |
1519 | case IEEE80211_STYPE_ACTION: |
1520 | switch (mgmt->u.action.category) { | |
1521 | case WLAN_CATEGORY_SPECTRUM_MGMT: | |
1522 | ies_len = skb->len - | |
1523 | offsetof(struct ieee80211_mgmt, | |
1524 | u.action.u.chan_switch.variable); | |
1525 | ||
1526 | if (ies_len < 0) | |
1527 | break; | |
1528 | ||
1529 | ieee802_11_parse_elems( | |
1530 | mgmt->u.action.u.chan_switch.variable, | |
1531 | ies_len, true, &elems); | |
1532 | ||
1533 | if (elems.parse_error) | |
1534 | break; | |
1535 | ||
1536 | ieee80211_rx_mgmt_spectrum_mgmt(sdata, mgmt, skb->len, | |
1537 | rx_status, &elems); | |
1538 | break; | |
1539 | } | |
46900298 | 1540 | } |
7a17a33c | 1541 | |
c926d006 | 1542 | mgmt_out: |
8d61ffa5 | 1543 | sdata_unlock(sdata); |
46900298 JB |
1544 | } |
1545 | ||
1fa57d01 | 1546 | void ieee80211_ibss_work(struct ieee80211_sub_if_data *sdata) |
46900298 | 1547 | { |
1fa57d01 | 1548 | struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; |
8bf11d8d | 1549 | struct sta_info *sta; |
46900298 | 1550 | |
8d61ffa5 | 1551 | sdata_lock(sdata); |
7a17a33c JB |
1552 | |
1553 | /* | |
1554 | * Work could be scheduled after scan or similar | |
1555 | * when we aren't even joined (or trying) with a | |
1556 | * network. | |
1557 | */ | |
1558 | if (!ifibss->ssid_len) | |
1559 | goto out; | |
46900298 | 1560 | |
8bf11d8d JB |
1561 | spin_lock_bh(&ifibss->incomplete_lock); |
1562 | while (!list_empty(&ifibss->incomplete_stations)) { | |
1563 | sta = list_first_entry(&ifibss->incomplete_stations, | |
1564 | struct sta_info, list); | |
1565 | list_del(&sta->list); | |
1566 | spin_unlock_bh(&ifibss->incomplete_lock); | |
1567 | ||
52874a5e | 1568 | ieee80211_ibss_finish_sta(sta); |
8bf11d8d JB |
1569 | rcu_read_unlock(); |
1570 | spin_lock_bh(&ifibss->incomplete_lock); | |
1571 | } | |
1572 | spin_unlock_bh(&ifibss->incomplete_lock); | |
1573 | ||
46900298 JB |
1574 | switch (ifibss->state) { |
1575 | case IEEE80211_IBSS_MLME_SEARCH: | |
1576 | ieee80211_sta_find_ibss(sdata); | |
1577 | break; | |
1578 | case IEEE80211_IBSS_MLME_JOINED: | |
1579 | ieee80211_sta_merge_ibss(sdata); | |
1580 | break; | |
1581 | default: | |
1582 | WARN_ON(1); | |
1583 | break; | |
1584 | } | |
46900298 | 1585 | |
7a17a33c | 1586 | out: |
8d61ffa5 | 1587 | sdata_unlock(sdata); |
3a4d4aa2 JB |
1588 | } |
1589 | ||
46900298 JB |
1590 | static void ieee80211_ibss_timer(unsigned long data) |
1591 | { | |
1592 | struct ieee80211_sub_if_data *sdata = | |
1593 | (struct ieee80211_sub_if_data *) data; | |
5bb644a0 | 1594 | |
a6182943 | 1595 | ieee80211_queue_work(&sdata->local->hw, &sdata->work); |
5bb644a0 | 1596 | } |
5bb644a0 | 1597 | |
46900298 JB |
1598 | void ieee80211_ibss_setup_sdata(struct ieee80211_sub_if_data *sdata) |
1599 | { | |
1600 | struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; | |
1601 | ||
46900298 JB |
1602 | setup_timer(&ifibss->timer, ieee80211_ibss_timer, |
1603 | (unsigned long) sdata); | |
8bf11d8d JB |
1604 | INIT_LIST_HEAD(&ifibss->incomplete_stations); |
1605 | spin_lock_init(&ifibss->incomplete_lock); | |
cd7760e6 SW |
1606 | INIT_WORK(&ifibss->csa_connection_drop_work, |
1607 | ieee80211_csa_connection_drop_work); | |
46900298 JB |
1608 | } |
1609 | ||
1610 | /* scan finished notification */ | |
1611 | void ieee80211_ibss_notify_scan_completed(struct ieee80211_local *local) | |
1612 | { | |
af8cdcd8 | 1613 | struct ieee80211_sub_if_data *sdata; |
46900298 | 1614 | |
29b4a4f7 JB |
1615 | mutex_lock(&local->iflist_mtx); |
1616 | list_for_each_entry(sdata, &local->interfaces, list) { | |
9607e6b6 | 1617 | if (!ieee80211_sdata_running(sdata)) |
0e41f715 | 1618 | continue; |
af8cdcd8 JB |
1619 | if (sdata->vif.type != NL80211_IFTYPE_ADHOC) |
1620 | continue; | |
1621 | sdata->u.ibss.last_scan_completed = jiffies; | |
7a17a33c | 1622 | ieee80211_queue_work(&local->hw, &sdata->work); |
46900298 | 1623 | } |
29b4a4f7 | 1624 | mutex_unlock(&local->iflist_mtx); |
46900298 JB |
1625 | } |
1626 | ||
af8cdcd8 JB |
1627 | int ieee80211_ibss_join(struct ieee80211_sub_if_data *sdata, |
1628 | struct cfg80211_ibss_params *params) | |
1629 | { | |
ff3cc5f4 | 1630 | u32 changed = 0; |
2103dec1 SW |
1631 | u32 rate_flags; |
1632 | struct ieee80211_supported_band *sband; | |
71965c1d LC |
1633 | enum ieee80211_chanctx_mode chanmode; |
1634 | struct ieee80211_local *local = sdata->local; | |
1635 | int radar_detect_width = 0; | |
2103dec1 | 1636 | int i; |
71965c1d LC |
1637 | int ret; |
1638 | ||
1639 | ret = cfg80211_chandef_dfs_required(local->hw.wiphy, | |
1640 | ¶ms->chandef, | |
1641 | sdata->wdev.iftype); | |
1642 | if (ret < 0) | |
1643 | return ret; | |
1644 | ||
1645 | if (ret > 0) { | |
1646 | if (!params->userspace_handles_dfs) | |
1647 | return -EINVAL; | |
1648 | radar_detect_width = BIT(params->chandef.width); | |
1649 | } | |
1650 | ||
1651 | chanmode = (params->channel_fixed && !ret) ? | |
1652 | IEEE80211_CHANCTX_SHARED : IEEE80211_CHANCTX_EXCLUSIVE; | |
1653 | ||
1654 | mutex_lock(&local->chanctx_mtx); | |
1655 | ret = ieee80211_check_combinations(sdata, ¶ms->chandef, chanmode, | |
1656 | radar_detect_width); | |
1657 | mutex_unlock(&local->chanctx_mtx); | |
1658 | if (ret < 0) | |
1659 | return ret; | |
af8cdcd8 | 1660 | |
af8cdcd8 JB |
1661 | if (params->bssid) { |
1662 | memcpy(sdata->u.ibss.bssid, params->bssid, ETH_ALEN); | |
1663 | sdata->u.ibss.fixed_bssid = true; | |
1664 | } else | |
1665 | sdata->u.ibss.fixed_bssid = false; | |
1666 | ||
fffd0934 | 1667 | sdata->u.ibss.privacy = params->privacy; |
267335d6 | 1668 | sdata->u.ibss.control_port = params->control_port; |
8e8d347d | 1669 | sdata->u.ibss.userspace_handles_dfs = params->userspace_handles_dfs; |
fbd2c8dc | 1670 | sdata->u.ibss.basic_rates = params->basic_rates; |
c7d37a66 | 1671 | sdata->u.ibss.last_scan_completed = jiffies; |
2103dec1 SW |
1672 | |
1673 | /* fix basic_rates if channel does not support these rates */ | |
1674 | rate_flags = ieee80211_chandef_rate_flags(¶ms->chandef); | |
71965c1d | 1675 | sband = local->hw.wiphy->bands[params->chandef.chan->band]; |
2103dec1 SW |
1676 | for (i = 0; i < sband->n_bitrates; i++) { |
1677 | if ((rate_flags & sband->bitrates[i].flags) != rate_flags) | |
1678 | sdata->u.ibss.basic_rates &= ~BIT(i); | |
1679 | } | |
dd5b4cc7 FF |
1680 | memcpy(sdata->vif.bss_conf.mcast_rate, params->mcast_rate, |
1681 | sizeof(params->mcast_rate)); | |
fffd0934 | 1682 | |
57c4d7b4 JB |
1683 | sdata->vif.bss_conf.beacon_int = params->beacon_interval; |
1684 | ||
3aede78a | 1685 | sdata->u.ibss.chandef = params->chandef; |
af8cdcd8 JB |
1686 | sdata->u.ibss.fixed_channel = params->channel_fixed; |
1687 | ||
1688 | if (params->ie) { | |
1689 | sdata->u.ibss.ie = kmemdup(params->ie, params->ie_len, | |
1690 | GFP_KERNEL); | |
1691 | if (sdata->u.ibss.ie) | |
1692 | sdata->u.ibss.ie_len = params->ie_len; | |
1693 | } | |
1694 | ||
af8cdcd8 JB |
1695 | sdata->u.ibss.state = IEEE80211_IBSS_MLME_SEARCH; |
1696 | sdata->u.ibss.ibss_join_req = jiffies; | |
1697 | ||
badecb00 | 1698 | memcpy(sdata->u.ibss.ssid, params->ssid, params->ssid_len); |
0e41f715 JB |
1699 | sdata->u.ibss.ssid_len = params->ssid_len; |
1700 | ||
822854b0 SW |
1701 | memcpy(&sdata->u.ibss.ht_capa, ¶ms->ht_capa, |
1702 | sizeof(sdata->u.ibss.ht_capa)); | |
1703 | memcpy(&sdata->u.ibss.ht_capa_mask, ¶ms->ht_capa_mask, | |
1704 | sizeof(sdata->u.ibss.ht_capa_mask)); | |
1705 | ||
ff3cc5f4 SW |
1706 | /* |
1707 | * 802.11n-2009 9.13.3.1: In an IBSS, the HT Protection field is | |
1708 | * reserved, but an HT STA shall protect HT transmissions as though | |
1709 | * the HT Protection field were set to non-HT mixed mode. | |
1710 | * | |
1711 | * In an IBSS, the RIFS Mode field of the HT Operation element is | |
1712 | * also reserved, but an HT STA shall operate as though this field | |
1713 | * were set to 1. | |
1714 | */ | |
1715 | ||
1716 | sdata->vif.bss_conf.ht_operation_mode |= | |
1717 | IEEE80211_HT_OP_MODE_PROTECTION_NONHT_MIXED | |
1718 | | IEEE80211_HT_PARAM_RIFS_MODE; | |
1719 | ||
1720 | changed |= BSS_CHANGED_HT; | |
1721 | ieee80211_bss_info_change_notify(sdata, changed); | |
1722 | ||
04ecd257 | 1723 | sdata->smps_mode = IEEE80211_SMPS_OFF; |
71965c1d | 1724 | sdata->needed_rx_chains = local->rx_chains; |
04ecd257 | 1725 | |
71965c1d | 1726 | ieee80211_queue_work(&local->hw, &sdata->work); |
af8cdcd8 JB |
1727 | |
1728 | return 0; | |
1729 | } | |
1730 | ||
1731 | int ieee80211_ibss_leave(struct ieee80211_sub_if_data *sdata) | |
1732 | { | |
5ea096c0 | 1733 | struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; |
5ea096c0 | 1734 | |
871a4180 | 1735 | ieee80211_ibss_disconnect(sdata); |
b78a4932 | 1736 | ifibss->ssid_len = 0; |
871a4180 | 1737 | memset(ifibss->bssid, 0, ETH_ALEN); |
af8cdcd8 JB |
1738 | |
1739 | /* remove beacon */ | |
1740 | kfree(sdata->u.ibss.ie); | |
822854b0 SW |
1741 | |
1742 | /* on the next join, re-program HT parameters */ | |
1743 | memset(&ifibss->ht_capa, 0, sizeof(ifibss->ht_capa)); | |
1744 | memset(&ifibss->ht_capa_mask, 0, sizeof(ifibss->ht_capa_mask)); | |
1745 | ||
af8cdcd8 | 1746 | synchronize_rcu(); |
af8cdcd8 | 1747 | |
35f20c14 | 1748 | skb_queue_purge(&sdata->skb_queue); |
5cff20e6 | 1749 | |
bc05d19f | 1750 | del_timer_sync(&sdata->u.ibss.timer); |
7a17a33c | 1751 | |
af8cdcd8 JB |
1752 | return 0; |
1753 | } |