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) | |
33 | ||
34 | #define IEEE80211_IBSS_MAX_STA_ENTRIES 128 | |
35 | ||
36 | ||
af8cdcd8 JB |
37 | static void __ieee80211_sta_join_ibss(struct ieee80211_sub_if_data *sdata, |
38 | const u8 *bssid, const int beacon_int, | |
39 | struct ieee80211_channel *chan, | |
b59066a2 | 40 | const u32 basic_rates, |
c13a765b SM |
41 | const u16 capability, u64 tsf, |
42 | bool creator) | |
46900298 JB |
43 | { |
44 | struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; | |
45 | struct ieee80211_local *local = sdata->local; | |
2103dec1 | 46 | int rates_n = 0, i, ri; |
46900298 JB |
47 | struct ieee80211_mgmt *mgmt; |
48 | u8 *pos; | |
49 | struct ieee80211_supported_band *sband; | |
f446d10f | 50 | struct cfg80211_bss *bss; |
2103dec1 | 51 | u32 bss_change, rate_flags, rates = 0, rates_added = 0; |
683b6d3b | 52 | struct cfg80211_chan_def chandef; |
7ca15a0a | 53 | enum nl80211_bss_scan_width scan_width; |
2ec9c1f6 | 54 | bool have_higher_than_11mbit = false; |
c3ffeab4 JB |
55 | struct beacon_data *presp; |
56 | int frame_len; | |
2103dec1 | 57 | int shift; |
24487981 | 58 | |
8d61ffa5 | 59 | sdata_assert_lock(sdata); |
7a17a33c | 60 | |
24487981 | 61 | /* Reset own TSF to allow time synchronization work. */ |
37a41b4a | 62 | drv_reset_tsf(local, sdata); |
46900298 | 63 | |
b203ca39 | 64 | if (!ether_addr_equal(ifibss->bssid, bssid)) |
b998e8bb | 65 | sta_info_flush(sdata); |
46900298 | 66 | |
49b5c7f4 JB |
67 | /* if merging, indicate to driver that we leave the old IBSS */ |
68 | if (sdata->vif.bss_conf.ibss_joined) { | |
69 | sdata->vif.bss_conf.ibss_joined = false; | |
c13a765b | 70 | sdata->vif.bss_conf.ibss_creator = false; |
1852d40e | 71 | sdata->vif.bss_conf.enable_beacon = false; |
86a2ea41 | 72 | netif_carrier_off(sdata->dev); |
1852d40e JB |
73 | ieee80211_bss_info_change_notify(sdata, |
74 | BSS_CHANGED_IBSS | | |
75 | BSS_CHANGED_BEACON_ENABLED); | |
49b5c7f4 JB |
76 | } |
77 | ||
c3ffeab4 | 78 | presp = rcu_dereference_protected(ifibss->presp, |
8d61ffa5 | 79 | lockdep_is_held(&sdata->wdev.mtx)); |
c3ffeab4 JB |
80 | rcu_assign_pointer(ifibss->presp, NULL); |
81 | if (presp) | |
82 | kfree_rcu(presp, rcu_head); | |
1852d40e | 83 | |
af8cdcd8 | 84 | sdata->drop_unencrypted = capability & WLAN_CAPABILITY_PRIVACY ? 1 : 0; |
46900298 | 85 | |
3aede78a | 86 | chandef = ifibss->chandef; |
4bf88530 | 87 | if (!cfg80211_reg_can_beacon(local->hw.wiphy, &chandef)) { |
4b42aab1 SW |
88 | if (chandef.width == NL80211_CHAN_WIDTH_5 || |
89 | chandef.width == NL80211_CHAN_WIDTH_10 || | |
90 | chandef.width == NL80211_CHAN_WIDTH_20_NOHT || | |
91 | chandef.width == NL80211_CHAN_WIDTH_20) { | |
92 | sdata_info(sdata, | |
93 | "Failed to join IBSS, beacons forbidden\n"); | |
94 | return; | |
95 | } | |
4bf88530 JB |
96 | chandef.width = NL80211_CHAN_WIDTH_20; |
97 | chandef.center_freq1 = chan->center_freq; | |
98 | } | |
55de908a JB |
99 | |
100 | ieee80211_vif_release_channel(sdata); | |
4bf88530 | 101 | if (ieee80211_vif_use_channel(sdata, &chandef, |
55de908a JB |
102 | ifibss->fixed_channel ? |
103 | IEEE80211_CHANCTX_SHARED : | |
104 | IEEE80211_CHANCTX_EXCLUSIVE)) { | |
105 | sdata_info(sdata, "Failed to join IBSS, no channel context\n"); | |
106 | return; | |
13c40c54 | 107 | } |
55de908a JB |
108 | |
109 | memcpy(ifibss->bssid, bssid, ETH_ALEN); | |
57c4d7b4 | 110 | |
af8cdcd8 | 111 | sband = local->hw.wiphy->bands[chan->band]; |
2103dec1 | 112 | shift = ieee80211_vif_get_shift(&sdata->vif); |
46900298 JB |
113 | |
114 | /* Build IBSS probe response */ | |
c3ffeab4 JB |
115 | frame_len = sizeof(struct ieee80211_hdr_3addr) + |
116 | 12 /* struct ieee80211_mgmt.u.beacon */ + | |
117 | 2 + IEEE80211_MAX_SSID_LEN /* max SSID */ + | |
118 | 2 + 8 /* max Supported Rates */ + | |
119 | 3 /* max DS params */ + | |
120 | 4 /* IBSS params */ + | |
121 | 2 + (IEEE80211_MAX_SUPP_RATES - 8) + | |
122 | 2 + sizeof(struct ieee80211_ht_cap) + | |
123 | 2 + sizeof(struct ieee80211_ht_operation) + | |
124 | ifibss->ie_len; | |
125 | presp = kzalloc(sizeof(*presp) + frame_len, GFP_KERNEL); | |
126 | if (!presp) | |
127 | return; | |
128 | ||
129 | presp->head = (void *)(presp + 1); | |
130 | ||
131 | mgmt = (void *) presp->head; | |
46900298 JB |
132 | mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | |
133 | IEEE80211_STYPE_PROBE_RESP); | |
e83e6541 | 134 | eth_broadcast_addr(mgmt->da); |
47846c9b | 135 | memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN); |
46900298 | 136 | memcpy(mgmt->bssid, ifibss->bssid, ETH_ALEN); |
57c4d7b4 | 137 | mgmt->u.beacon.beacon_int = cpu_to_le16(beacon_int); |
707c1b4e | 138 | mgmt->u.beacon.timestamp = cpu_to_le64(tsf); |
46900298 JB |
139 | mgmt->u.beacon.capab_info = cpu_to_le16(capability); |
140 | ||
c3ffeab4 JB |
141 | pos = (u8 *)mgmt + offsetof(struct ieee80211_mgmt, u.beacon.variable); |
142 | ||
46900298 JB |
143 | *pos++ = WLAN_EID_SSID; |
144 | *pos++ = ifibss->ssid_len; | |
145 | memcpy(pos, ifibss->ssid, ifibss->ssid_len); | |
c3ffeab4 | 146 | pos += ifibss->ssid_len; |
46900298 | 147 | |
2103dec1 SW |
148 | rate_flags = ieee80211_chandef_rate_flags(&chandef); |
149 | for (i = 0; i < sband->n_bitrates; i++) { | |
150 | if ((rate_flags & sband->bitrates[i].flags) != rate_flags) | |
151 | continue; | |
2ec9c1f6 SW |
152 | if (sband->bitrates[i].bitrate > 110) |
153 | have_higher_than_11mbit = true; | |
2103dec1 SW |
154 | |
155 | rates |= BIT(i); | |
156 | rates_n++; | |
157 | } | |
158 | ||
46900298 | 159 | *pos++ = WLAN_EID_SUPP_RATES; |
2103dec1 SW |
160 | *pos++ = min_t(int, 8, rates_n); |
161 | for (ri = 0; ri < sband->n_bitrates; ri++) { | |
162 | int rate = DIV_ROUND_UP(sband->bitrates[ri].bitrate, | |
163 | 5 * (1 << shift)); | |
c3ffeab4 | 164 | u8 basic = 0; |
2103dec1 SW |
165 | if (!(rates & BIT(ri))) |
166 | continue; | |
167 | ||
168 | if (basic_rates & BIT(ri)) | |
c3ffeab4 | 169 | basic = 0x80; |
2103dec1 SW |
170 | *pos++ = basic | (u8) rate; |
171 | if (++rates_added == 8) | |
172 | break; | |
c3ffeab4 | 173 | } |
46900298 JB |
174 | |
175 | if (sband->band == IEEE80211_BAND_2GHZ) { | |
46900298 JB |
176 | *pos++ = WLAN_EID_DS_PARAMS; |
177 | *pos++ = 1; | |
af8cdcd8 | 178 | *pos++ = ieee80211_frequency_to_channel(chan->center_freq); |
46900298 JB |
179 | } |
180 | ||
46900298 JB |
181 | *pos++ = WLAN_EID_IBSS_PARAMS; |
182 | *pos++ = 2; | |
183 | /* FIX: set ATIM window based on scan results */ | |
184 | *pos++ = 0; | |
185 | *pos++ = 0; | |
186 | ||
2103dec1 SW |
187 | /* put the remaining rates in WLAN_EID_EXT_SUPP_RATES */ |
188 | if (rates_n > 8) { | |
46900298 | 189 | *pos++ = WLAN_EID_EXT_SUPP_RATES; |
2103dec1 SW |
190 | *pos++ = rates_n - 8; |
191 | for (; ri < sband->n_bitrates; ri++) { | |
192 | int rate = DIV_ROUND_UP(sband->bitrates[ri].bitrate, | |
193 | 5 * (1 << shift)); | |
c3ffeab4 | 194 | u8 basic = 0; |
2103dec1 SW |
195 | if (!(rates & BIT(ri))) |
196 | continue; | |
197 | ||
198 | if (basic_rates & BIT(ri)) | |
c3ffeab4 | 199 | basic = 0x80; |
2103dec1 | 200 | *pos++ = basic | (u8) rate; |
c3ffeab4 | 201 | } |
46900298 JB |
202 | } |
203 | ||
c3ffeab4 JB |
204 | if (ifibss->ie_len) { |
205 | memcpy(pos, ifibss->ie, ifibss->ie_len); | |
206 | pos += ifibss->ie_len; | |
207 | } | |
af8cdcd8 | 208 | |
13c40c54 | 209 | /* add HT capability and information IEs */ |
4bf88530 | 210 | if (chandef.width != NL80211_CHAN_WIDTH_20_NOHT && |
0418a445 SW |
211 | chandef.width != NL80211_CHAN_WIDTH_5 && |
212 | chandef.width != NL80211_CHAN_WIDTH_10 && | |
683b6d3b | 213 | sband->ht_cap.ht_supported) { |
822854b0 SW |
214 | struct ieee80211_sta_ht_cap ht_cap; |
215 | ||
216 | memcpy(&ht_cap, &sband->ht_cap, sizeof(ht_cap)); | |
217 | ieee80211_apply_htcap_overrides(sdata, &ht_cap); | |
218 | ||
219 | pos = ieee80211_ie_build_ht_cap(pos, &ht_cap, ht_cap.cap); | |
0d894ec5 AN |
220 | /* |
221 | * Note: According to 802.11n-2009 9.13.3.1, HT Protection | |
222 | * field and RIFS Mode are reserved in IBSS mode, therefore | |
223 | * keep them at 0 | |
224 | */ | |
074d46d1 | 225 | pos = ieee80211_ie_build_ht_oper(pos, &sband->ht_cap, |
4bf88530 | 226 | &chandef, 0); |
13c40c54 AS |
227 | } |
228 | ||
32c5057b | 229 | if (local->hw.queues >= IEEE80211_NUM_ACS) { |
9eba6125 BR |
230 | *pos++ = WLAN_EID_VENDOR_SPECIFIC; |
231 | *pos++ = 7; /* len */ | |
232 | *pos++ = 0x00; /* Microsoft OUI 00:50:F2 */ | |
233 | *pos++ = 0x50; | |
234 | *pos++ = 0xf2; | |
235 | *pos++ = 2; /* WME */ | |
236 | *pos++ = 0; /* WME info */ | |
237 | *pos++ = 1; /* WME ver */ | |
238 | *pos++ = 0; /* U-APSD no in use */ | |
239 | } | |
240 | ||
c3ffeab4 JB |
241 | presp->head_len = pos - presp->head; |
242 | if (WARN_ON(presp->head_len > frame_len)) | |
243 | return; | |
244 | ||
245 | rcu_assign_pointer(ifibss->presp, presp); | |
46900298 | 246 | |
d6a83228 | 247 | sdata->vif.bss_conf.enable_beacon = true; |
2d0ddec5 | 248 | sdata->vif.bss_conf.beacon_int = beacon_int; |
fbd2c8dc | 249 | sdata->vif.bss_conf.basic_rates = basic_rates; |
0ca54f6c MP |
250 | sdata->vif.bss_conf.ssid_len = ifibss->ssid_len; |
251 | memcpy(sdata->vif.bss_conf.ssid, ifibss->ssid, ifibss->ssid_len); | |
2d0ddec5 JB |
252 | bss_change = BSS_CHANGED_BEACON_INT; |
253 | bss_change |= ieee80211_reset_erp_info(sdata); | |
254 | bss_change |= BSS_CHANGED_BSSID; | |
255 | bss_change |= BSS_CHANGED_BEACON; | |
256 | bss_change |= BSS_CHANGED_BEACON_ENABLED; | |
392cfdb1 | 257 | bss_change |= BSS_CHANGED_BASIC_RATES; |
13c40c54 | 258 | bss_change |= BSS_CHANGED_HT; |
8fc214ba | 259 | bss_change |= BSS_CHANGED_IBSS; |
0ca54f6c | 260 | bss_change |= BSS_CHANGED_SSID; |
2f91a967 SW |
261 | |
262 | /* | |
263 | * In 5 GHz/802.11a, we can always use short slot time. | |
264 | * (IEEE 802.11-2012 18.3.8.7) | |
265 | * | |
266 | * In 2.4GHz, we must always use long slots in IBSS for compatibility | |
267 | * reasons. | |
268 | * (IEEE 802.11-2012 19.4.5) | |
269 | * | |
270 | * HT follows these specifications (IEEE 802.11-2012 20.3.18) | |
271 | */ | |
272 | sdata->vif.bss_conf.use_short_slot = chan->band == IEEE80211_BAND_5GHZ; | |
273 | bss_change |= BSS_CHANGED_ERP_SLOT; | |
274 | ||
2ec9c1f6 SW |
275 | /* cf. IEEE 802.11 9.2.12 */ |
276 | if (chan->band == IEEE80211_BAND_2GHZ && have_higher_than_11mbit) | |
277 | sdata->flags |= IEEE80211_SDATA_OPERATING_GMODE; | |
278 | else | |
279 | sdata->flags &= ~IEEE80211_SDATA_OPERATING_GMODE; | |
280 | ||
8fc214ba | 281 | sdata->vif.bss_conf.ibss_joined = true; |
c13a765b | 282 | sdata->vif.bss_conf.ibss_creator = creator; |
2d0ddec5 | 283 | ieee80211_bss_info_change_notify(sdata, bss_change); |
46900298 | 284 | |
2ec9c1f6 | 285 | ieee80211_set_wmm_default(sdata, true); |
46900298 | 286 | |
46900298 | 287 | ifibss->state = IEEE80211_IBSS_MLME_JOINED; |
af8cdcd8 JB |
288 | mod_timer(&ifibss->timer, |
289 | round_jiffies(jiffies + IEEE80211_IBSS_MERGE_INTERVAL)); | |
46900298 | 290 | |
7ca15a0a SW |
291 | scan_width = cfg80211_chandef_to_scan_width(&chandef); |
292 | bss = cfg80211_inform_bss_width_frame(local->hw.wiphy, chan, | |
293 | scan_width, mgmt, | |
294 | presp->head_len, 0, GFP_KERNEL); | |
5b112d3d | 295 | cfg80211_put_bss(local->hw.wiphy, bss); |
86a2ea41 | 296 | netif_carrier_on(sdata->dev); |
af8cdcd8 | 297 | cfg80211_ibss_joined(sdata->dev, ifibss->bssid, GFP_KERNEL); |
46900298 JB |
298 | } |
299 | ||
af8cdcd8 JB |
300 | static void ieee80211_sta_join_ibss(struct ieee80211_sub_if_data *sdata, |
301 | struct ieee80211_bss *bss) | |
46900298 | 302 | { |
0c1ad2ca JB |
303 | struct cfg80211_bss *cbss = |
304 | container_of((void *)bss, struct cfg80211_bss, priv); | |
b59066a2 JB |
305 | struct ieee80211_supported_band *sband; |
306 | u32 basic_rates; | |
307 | int i, j; | |
0c1ad2ca | 308 | u16 beacon_int = cbss->beacon_interval; |
8cef2c9d JB |
309 | const struct cfg80211_bss_ies *ies; |
310 | u64 tsf; | |
2103dec1 SW |
311 | u32 rate_flags; |
312 | int shift; | |
57c4d7b4 | 313 | |
8d61ffa5 | 314 | sdata_assert_lock(sdata); |
7a17a33c | 315 | |
57c4d7b4 JB |
316 | if (beacon_int < 10) |
317 | beacon_int = 10; | |
318 | ||
0c1ad2ca | 319 | sband = sdata->local->hw.wiphy->bands[cbss->channel->band]; |
2103dec1 SW |
320 | rate_flags = ieee80211_chandef_rate_flags(&sdata->u.ibss.chandef); |
321 | shift = ieee80211_vif_get_shift(&sdata->vif); | |
b59066a2 JB |
322 | |
323 | basic_rates = 0; | |
324 | ||
325 | for (i = 0; i < bss->supp_rates_len; i++) { | |
2103dec1 | 326 | int rate = bss->supp_rates[i] & 0x7f; |
b59066a2 JB |
327 | bool is_basic = !!(bss->supp_rates[i] & 0x80); |
328 | ||
329 | for (j = 0; j < sband->n_bitrates; j++) { | |
2103dec1 SW |
330 | int brate; |
331 | if ((rate_flags & sband->bitrates[j].flags) | |
332 | != rate_flags) | |
333 | continue; | |
334 | ||
335 | brate = DIV_ROUND_UP(sband->bitrates[j].bitrate, | |
336 | 5 * (1 << shift)); | |
337 | if (brate == rate) { | |
b59066a2 JB |
338 | if (is_basic) |
339 | basic_rates |= BIT(j); | |
340 | break; | |
341 | } | |
342 | } | |
343 | } | |
344 | ||
8cef2c9d JB |
345 | rcu_read_lock(); |
346 | ies = rcu_dereference(cbss->ies); | |
347 | tsf = ies->tsf; | |
348 | rcu_read_unlock(); | |
349 | ||
0c1ad2ca | 350 | __ieee80211_sta_join_ibss(sdata, cbss->bssid, |
57c4d7b4 | 351 | beacon_int, |
0c1ad2ca | 352 | cbss->channel, |
b59066a2 | 353 | basic_rates, |
0c1ad2ca | 354 | cbss->capability, |
8cef2c9d | 355 | tsf, false); |
46900298 JB |
356 | } |
357 | ||
52874a5e | 358 | static struct sta_info *ieee80211_ibss_finish_sta(struct sta_info *sta) |
8bf11d8d JB |
359 | __acquires(RCU) |
360 | { | |
361 | struct ieee80211_sub_if_data *sdata = sta->sdata; | |
362 | u8 addr[ETH_ALEN]; | |
363 | ||
364 | memcpy(addr, sta->sta.addr, ETH_ALEN); | |
365 | ||
bdcbd8e0 | 366 | ibss_dbg(sdata, "Adding new IBSS station %pM\n", addr); |
8bf11d8d | 367 | |
83d5cc01 JB |
368 | sta_info_pre_move_state(sta, IEEE80211_STA_AUTH); |
369 | sta_info_pre_move_state(sta, IEEE80211_STA_ASSOC); | |
267335d6 AQ |
370 | /* authorize the station only if the network is not RSN protected. If |
371 | * not wait for the userspace to authorize it */ | |
372 | if (!sta->sdata->u.ibss.control_port) | |
373 | sta_info_pre_move_state(sta, IEEE80211_STA_AUTHORIZED); | |
8bf11d8d JB |
374 | |
375 | rate_control_rate_init(sta); | |
376 | ||
377 | /* If it fails, maybe we raced another insertion? */ | |
378 | if (sta_info_insert_rcu(sta)) | |
379 | return sta_info_get(sdata, addr); | |
380 | return sta; | |
381 | } | |
382 | ||
383 | static struct sta_info * | |
52874a5e AQ |
384 | ieee80211_ibss_add_sta(struct ieee80211_sub_if_data *sdata, const u8 *bssid, |
385 | const u8 *addr, u32 supp_rates) | |
8bf11d8d JB |
386 | __acquires(RCU) |
387 | { | |
388 | struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; | |
389 | struct ieee80211_local *local = sdata->local; | |
390 | struct sta_info *sta; | |
55de908a | 391 | struct ieee80211_chanctx_conf *chanctx_conf; |
b422c6cd | 392 | struct ieee80211_supported_band *sband; |
74608aca | 393 | enum nl80211_bss_scan_width scan_width; |
55de908a | 394 | int band; |
8bf11d8d JB |
395 | |
396 | /* | |
397 | * XXX: Consider removing the least recently used entry and | |
398 | * allow new one to be added. | |
399 | */ | |
400 | if (local->num_sta >= IEEE80211_IBSS_MAX_STA_ENTRIES) { | |
bdcbd8e0 | 401 | net_info_ratelimited("%s: No room for a new IBSS STA entry %pM\n", |
e87cc472 | 402 | sdata->name, addr); |
8bf11d8d JB |
403 | rcu_read_lock(); |
404 | return NULL; | |
405 | } | |
406 | ||
407 | if (ifibss->state == IEEE80211_IBSS_MLME_SEARCH) { | |
408 | rcu_read_lock(); | |
409 | return NULL; | |
410 | } | |
411 | ||
b203ca39 | 412 | if (!ether_addr_equal(bssid, sdata->u.ibss.bssid)) { |
8bf11d8d JB |
413 | rcu_read_lock(); |
414 | return NULL; | |
415 | } | |
416 | ||
55de908a JB |
417 | rcu_read_lock(); |
418 | chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); | |
419 | if (WARN_ON_ONCE(!chanctx_conf)) | |
420 | return NULL; | |
4bf88530 | 421 | band = chanctx_conf->def.chan->band; |
74608aca | 422 | scan_width = cfg80211_chandef_to_scan_width(&chanctx_conf->def); |
55de908a JB |
423 | rcu_read_unlock(); |
424 | ||
8bf11d8d JB |
425 | sta = sta_info_alloc(sdata, addr, GFP_KERNEL); |
426 | if (!sta) { | |
427 | rcu_read_lock(); | |
428 | return NULL; | |
429 | } | |
430 | ||
431 | sta->last_rx = jiffies; | |
432 | ||
433 | /* make sure mandatory rates are always added */ | |
b422c6cd | 434 | sband = local->hw.wiphy->bands[band]; |
8bf11d8d | 435 | sta->sta.supp_rates[band] = supp_rates | |
74608aca | 436 | ieee80211_mandatory_rates(sband, scan_width); |
8bf11d8d | 437 | |
52874a5e | 438 | return ieee80211_ibss_finish_sta(sta); |
6d810f10 AQ |
439 | } |
440 | ||
2cc59e78 AQ |
441 | static void ieee80211_rx_mgmt_deauth_ibss(struct ieee80211_sub_if_data *sdata, |
442 | struct ieee80211_mgmt *mgmt, | |
443 | size_t len) | |
444 | { | |
445 | u16 reason = le16_to_cpu(mgmt->u.deauth.reason_code); | |
446 | ||
447 | if (len < IEEE80211_DEAUTH_FRAME_LEN) | |
448 | return; | |
449 | ||
450 | ibss_dbg(sdata, "RX DeAuth SA=%pM DA=%pM BSSID=%pM (reason: %d)\n", | |
451 | mgmt->sa, mgmt->da, mgmt->bssid, reason); | |
452 | sta_info_destroy_addr(sdata, mgmt->sa); | |
453 | } | |
454 | ||
6d810f10 AQ |
455 | static void ieee80211_rx_mgmt_auth_ibss(struct ieee80211_sub_if_data *sdata, |
456 | struct ieee80211_mgmt *mgmt, | |
457 | size_t len) | |
458 | { | |
459 | u16 auth_alg, auth_transaction; | |
460 | ||
8d61ffa5 | 461 | sdata_assert_lock(sdata); |
6d810f10 AQ |
462 | |
463 | if (len < 24 + 6) | |
464 | return; | |
465 | ||
466 | auth_alg = le16_to_cpu(mgmt->u.auth.auth_alg); | |
467 | auth_transaction = le16_to_cpu(mgmt->u.auth.auth_transaction); | |
468 | ||
bdcbd8e0 JB |
469 | ibss_dbg(sdata, |
470 | "RX Auth SA=%pM DA=%pM BSSID=%pM (auth_transaction=%d)\n", | |
471 | mgmt->sa, mgmt->da, mgmt->bssid, auth_transaction); | |
7bed2050 AQ |
472 | |
473 | if (auth_alg != WLAN_AUTH_OPEN || auth_transaction != 1) | |
474 | return; | |
475 | ||
6d810f10 AQ |
476 | /* |
477 | * IEEE 802.11 standard does not require authentication in IBSS | |
478 | * networks and most implementations do not seem to use it. | |
479 | * However, try to reply to authentication attempts if someone | |
480 | * has actually implemented this. | |
481 | */ | |
700e8ea6 | 482 | ieee80211_send_auth(sdata, 2, WLAN_AUTH_OPEN, 0, NULL, 0, |
1672c0e3 | 483 | mgmt->sa, sdata->u.ibss.bssid, NULL, 0, 0, 0); |
8bf11d8d JB |
484 | } |
485 | ||
46900298 | 486 | static void ieee80211_rx_bss_info(struct ieee80211_sub_if_data *sdata, |
d45c4172 | 487 | struct ieee80211_mgmt *mgmt, size_t len, |
46900298 | 488 | struct ieee80211_rx_status *rx_status, |
d45c4172 | 489 | struct ieee802_11_elems *elems) |
46900298 JB |
490 | { |
491 | struct ieee80211_local *local = sdata->local; | |
492 | int freq; | |
0c1ad2ca | 493 | struct cfg80211_bss *cbss; |
46900298 JB |
494 | struct ieee80211_bss *bss; |
495 | struct sta_info *sta; | |
496 | struct ieee80211_channel *channel; | |
497 | u64 beacon_timestamp, rx_timestamp; | |
498 | u32 supp_rates = 0; | |
499 | enum ieee80211_band band = rx_status->band; | |
74608aca | 500 | enum nl80211_bss_scan_width scan_width; |
13c40c54 AS |
501 | struct ieee80211_supported_band *sband = local->hw.wiphy->bands[band]; |
502 | bool rates_updated = false; | |
46900298 | 503 | |
1cd8e88e | 504 | if (elems->ds_params) |
59eb21a6 BR |
505 | freq = ieee80211_channel_to_frequency(elems->ds_params[0], |
506 | band); | |
46900298 JB |
507 | else |
508 | freq = rx_status->freq; | |
509 | ||
510 | channel = ieee80211_get_channel(local->hw.wiphy, freq); | |
511 | ||
512 | if (!channel || channel->flags & IEEE80211_CHAN_DISABLED) | |
513 | return; | |
514 | ||
9eba6125 | 515 | if (sdata->vif.type == NL80211_IFTYPE_ADHOC && |
b203ca39 | 516 | ether_addr_equal(mgmt->bssid, sdata->u.ibss.bssid)) { |
46900298 JB |
517 | |
518 | rcu_read_lock(); | |
abe60632 | 519 | sta = sta_info_get(sdata, mgmt->sa); |
46900298 | 520 | |
9eba6125 | 521 | if (elems->supp_rates) { |
2103dec1 | 522 | supp_rates = ieee80211_sta_get_rates(sdata, elems, |
9ebb61a2 | 523 | band, NULL); |
9eba6125 BR |
524 | if (sta) { |
525 | u32 prev_rates; | |
526 | ||
527 | prev_rates = sta->sta.supp_rates[band]; | |
528 | /* make sure mandatory rates are always added */ | |
74608aca SW |
529 | scan_width = NL80211_BSS_CHAN_WIDTH_20; |
530 | if (rx_status->flag & RX_FLAG_5MHZ) | |
531 | scan_width = NL80211_BSS_CHAN_WIDTH_5; | |
532 | if (rx_status->flag & RX_FLAG_10MHZ) | |
533 | scan_width = NL80211_BSS_CHAN_WIDTH_10; | |
46900298 | 534 | |
74608aca SW |
535 | sta->sta.supp_rates[band] = supp_rates | |
536 | ieee80211_mandatory_rates(sband, | |
537 | scan_width); | |
9eba6125 | 538 | if (sta->sta.supp_rates[band] != prev_rates) { |
bdcbd8e0 JB |
539 | ibss_dbg(sdata, |
540 | "updated supp_rates set for %pM based on beacon/probe_resp (0x%x -> 0x%x)\n", | |
541 | sta->sta.addr, prev_rates, | |
542 | sta->sta.supp_rates[band]); | |
13c40c54 | 543 | rates_updated = true; |
9eba6125 | 544 | } |
8bf11d8d JB |
545 | } else { |
546 | rcu_read_unlock(); | |
9eba6125 | 547 | sta = ieee80211_ibss_add_sta(sdata, mgmt->bssid, |
52874a5e | 548 | mgmt->sa, supp_rates); |
8bf11d8d | 549 | } |
34e89507 | 550 | } |
9eba6125 BR |
551 | |
552 | if (sta && elems->wmm_info) | |
c2c98fde | 553 | set_sta_flag(sta, WLAN_STA_WME); |
9eba6125 | 554 | |
074d46d1 | 555 | if (sta && elems->ht_operation && elems->ht_cap_elem && |
3aede78a SW |
556 | sdata->u.ibss.chandef.width != NL80211_CHAN_WIDTH_20_NOHT && |
557 | sdata->u.ibss.chandef.width != NL80211_CHAN_WIDTH_5 && | |
558 | sdata->u.ibss.chandef.width != NL80211_CHAN_WIDTH_10) { | |
13c40c54 | 559 | /* we both use HT */ |
e1a0c6b3 | 560 | struct ieee80211_ht_cap htcap_ie; |
4bf88530 JB |
561 | struct cfg80211_chan_def chandef; |
562 | ||
563 | ieee80211_ht_oper_to_chandef(channel, | |
564 | elems->ht_operation, | |
565 | &chandef); | |
13c40c54 | 566 | |
e1a0c6b3 | 567 | memcpy(&htcap_ie, elems->ht_cap_elem, sizeof(htcap_ie)); |
13c40c54 AS |
568 | |
569 | /* | |
570 | * fall back to HT20 if we don't use or use | |
571 | * the other extension channel | |
572 | */ | |
3aede78a SW |
573 | if (chandef.center_freq1 != |
574 | sdata->u.ibss.chandef.center_freq1) | |
e1a0c6b3 JB |
575 | htcap_ie.cap_info &= |
576 | cpu_to_le16(~IEEE80211_HT_CAP_SUP_WIDTH_20_40); | |
577 | ||
578 | rates_updated |= ieee80211_ht_cap_ie_to_sta_ht_cap( | |
579 | sdata, sband, &htcap_ie, sta); | |
13c40c54 AS |
580 | } |
581 | ||
e687f61e AQ |
582 | if (sta && rates_updated) { |
583 | drv_sta_rc_update(local, sdata, &sta->sta, | |
584 | IEEE80211_RC_SUPP_RATES_CHANGED); | |
13c40c54 | 585 | rate_control_rate_init(sta); |
e687f61e | 586 | } |
13c40c54 | 587 | |
9eba6125 | 588 | rcu_read_unlock(); |
46900298 JB |
589 | } |
590 | ||
591 | bss = ieee80211_bss_info_update(local, rx_status, mgmt, len, elems, | |
d45c4172 | 592 | channel); |
46900298 JB |
593 | if (!bss) |
594 | return; | |
595 | ||
0c1ad2ca JB |
596 | cbss = container_of((void *)bss, struct cfg80211_bss, priv); |
597 | ||
8cef2c9d JB |
598 | /* same for beacon and probe response */ |
599 | beacon_timestamp = le64_to_cpu(mgmt->u.beacon.timestamp); | |
46900298 JB |
600 | |
601 | /* check if we need to merge IBSS */ | |
602 | ||
46900298 | 603 | /* we use a fixed BSSID */ |
a98bfec2 | 604 | if (sdata->u.ibss.fixed_bssid) |
46900298 JB |
605 | goto put_bss; |
606 | ||
607 | /* not an IBSS */ | |
0c1ad2ca | 608 | if (!(cbss->capability & WLAN_CAPABILITY_IBSS)) |
46900298 JB |
609 | goto put_bss; |
610 | ||
611 | /* different channel */ | |
55de908a | 612 | if (sdata->u.ibss.fixed_channel && |
3aede78a | 613 | sdata->u.ibss.chandef.chan != cbss->channel) |
46900298 JB |
614 | goto put_bss; |
615 | ||
616 | /* different SSID */ | |
617 | if (elems->ssid_len != sdata->u.ibss.ssid_len || | |
618 | memcmp(elems->ssid, sdata->u.ibss.ssid, | |
619 | sdata->u.ibss.ssid_len)) | |
620 | goto put_bss; | |
621 | ||
34e8f082 | 622 | /* same BSSID */ |
b203ca39 | 623 | if (ether_addr_equal(cbss->bssid, sdata->u.ibss.bssid)) |
34e8f082 AF |
624 | goto put_bss; |
625 | ||
f4bda337 TP |
626 | if (ieee80211_have_rx_timestamp(rx_status)) { |
627 | /* time when timestamp field was received */ | |
628 | rx_timestamp = | |
629 | ieee80211_calculate_rx_timestamp(local, rx_status, | |
630 | len + FCS_LEN, 24); | |
24487981 JB |
631 | } else { |
632 | /* | |
633 | * second best option: get current TSF | |
634 | * (will return -1 if not supported) | |
635 | */ | |
37a41b4a | 636 | rx_timestamp = drv_get_tsf(local, sdata); |
24487981 | 637 | } |
46900298 | 638 | |
bdcbd8e0 JB |
639 | ibss_dbg(sdata, |
640 | "RX beacon SA=%pM BSSID=%pM TSF=0x%llx BCN=0x%llx diff=%lld @%lu\n", | |
641 | mgmt->sa, mgmt->bssid, | |
642 | (unsigned long long)rx_timestamp, | |
643 | (unsigned long long)beacon_timestamp, | |
644 | (unsigned long long)(rx_timestamp - beacon_timestamp), | |
645 | jiffies); | |
46900298 JB |
646 | |
647 | if (beacon_timestamp > rx_timestamp) { | |
bdcbd8e0 JB |
648 | ibss_dbg(sdata, |
649 | "beacon TSF higher than local TSF - IBSS merge with BSSID %pM\n", | |
650 | mgmt->bssid); | |
46900298 | 651 | ieee80211_sta_join_ibss(sdata, bss); |
2103dec1 | 652 | supp_rates = ieee80211_sta_get_rates(sdata, elems, band, NULL); |
34e89507 | 653 | ieee80211_ibss_add_sta(sdata, mgmt->bssid, mgmt->sa, |
52874a5e | 654 | supp_rates); |
8bf11d8d | 655 | rcu_read_unlock(); |
46900298 JB |
656 | } |
657 | ||
658 | put_bss: | |
659 | ieee80211_rx_bss_put(local, bss); | |
660 | } | |
661 | ||
8bf11d8d JB |
662 | void ieee80211_ibss_rx_no_sta(struct ieee80211_sub_if_data *sdata, |
663 | const u8 *bssid, const u8 *addr, | |
664 | u32 supp_rates) | |
46900298 | 665 | { |
2e10d330 | 666 | struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; |
46900298 JB |
667 | struct ieee80211_local *local = sdata->local; |
668 | struct sta_info *sta; | |
55de908a | 669 | struct ieee80211_chanctx_conf *chanctx_conf; |
b422c6cd | 670 | struct ieee80211_supported_band *sband; |
74608aca | 671 | enum nl80211_bss_scan_width scan_width; |
55de908a | 672 | int band; |
46900298 | 673 | |
af8cdcd8 JB |
674 | /* |
675 | * XXX: Consider removing the least recently used entry and | |
676 | * allow new one to be added. | |
677 | */ | |
46900298 | 678 | if (local->num_sta >= IEEE80211_IBSS_MAX_STA_ENTRIES) { |
bdcbd8e0 | 679 | net_info_ratelimited("%s: No room for a new IBSS STA entry %pM\n", |
e87cc472 | 680 | sdata->name, addr); |
8bf11d8d | 681 | return; |
46900298 JB |
682 | } |
683 | ||
2e10d330 | 684 | if (ifibss->state == IEEE80211_IBSS_MLME_SEARCH) |
8bf11d8d | 685 | return; |
2e10d330 | 686 | |
b203ca39 | 687 | if (!ether_addr_equal(bssid, sdata->u.ibss.bssid)) |
8bf11d8d | 688 | return; |
46900298 | 689 | |
55de908a JB |
690 | rcu_read_lock(); |
691 | chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); | |
692 | if (WARN_ON_ONCE(!chanctx_conf)) { | |
693 | rcu_read_unlock(); | |
694 | return; | |
695 | } | |
4bf88530 | 696 | band = chanctx_conf->def.chan->band; |
74608aca | 697 | scan_width = cfg80211_chandef_to_scan_width(&chanctx_conf->def); |
55de908a JB |
698 | rcu_read_unlock(); |
699 | ||
8bf11d8d | 700 | sta = sta_info_alloc(sdata, addr, GFP_ATOMIC); |
46900298 | 701 | if (!sta) |
8bf11d8d | 702 | return; |
46900298 | 703 | |
c8716d9d | 704 | sta->last_rx = jiffies; |
d9a7ddb0 | 705 | |
46900298 | 706 | /* make sure mandatory rates are always added */ |
b422c6cd | 707 | sband = local->hw.wiphy->bands[band]; |
46900298 | 708 | sta->sta.supp_rates[band] = supp_rates | |
74608aca | 709 | ieee80211_mandatory_rates(sband, scan_width); |
46900298 | 710 | |
8bf11d8d JB |
711 | spin_lock(&ifibss->incomplete_lock); |
712 | list_add(&sta->list, &ifibss->incomplete_stations); | |
713 | spin_unlock(&ifibss->incomplete_lock); | |
714 | ieee80211_queue_work(&local->hw, &sdata->work); | |
46900298 JB |
715 | } |
716 | ||
717 | static int ieee80211_sta_active_ibss(struct ieee80211_sub_if_data *sdata) | |
718 | { | |
719 | struct ieee80211_local *local = sdata->local; | |
720 | int active = 0; | |
721 | struct sta_info *sta; | |
722 | ||
8d61ffa5 | 723 | sdata_assert_lock(sdata); |
7a17a33c | 724 | |
46900298 JB |
725 | rcu_read_lock(); |
726 | ||
727 | list_for_each_entry_rcu(sta, &local->sta_list, list) { | |
728 | if (sta->sdata == sdata && | |
729 | time_after(sta->last_rx + IEEE80211_IBSS_MERGE_INTERVAL, | |
730 | jiffies)) { | |
731 | active++; | |
732 | break; | |
733 | } | |
734 | } | |
735 | ||
736 | rcu_read_unlock(); | |
737 | ||
738 | return active; | |
739 | } | |
740 | ||
ce9058ae BP |
741 | /* |
742 | * This function is called with state == IEEE80211_IBSS_MLME_JOINED | |
743 | */ | |
46900298 JB |
744 | |
745 | static void ieee80211_sta_merge_ibss(struct ieee80211_sub_if_data *sdata) | |
746 | { | |
747 | struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; | |
7ca15a0a | 748 | enum nl80211_bss_scan_width scan_width; |
46900298 | 749 | |
8d61ffa5 | 750 | sdata_assert_lock(sdata); |
7a17a33c | 751 | |
af8cdcd8 JB |
752 | mod_timer(&ifibss->timer, |
753 | round_jiffies(jiffies + IEEE80211_IBSS_MERGE_INTERVAL)); | |
46900298 JB |
754 | |
755 | ieee80211_sta_expire(sdata, IEEE80211_IBSS_INACTIVITY_LIMIT); | |
af8cdcd8 | 756 | |
450aae3d S |
757 | if (time_before(jiffies, ifibss->last_scan_completed + |
758 | IEEE80211_IBSS_MERGE_INTERVAL)) | |
759 | return; | |
760 | ||
46900298 JB |
761 | if (ieee80211_sta_active_ibss(sdata)) |
762 | return; | |
763 | ||
c037b836 | 764 | if (ifibss->fixed_channel) |
46900298 JB |
765 | return; |
766 | ||
bdcbd8e0 JB |
767 | sdata_info(sdata, |
768 | "No active IBSS STAs - trying to scan for other IBSS networks with same SSID (merge)\n"); | |
46900298 | 769 | |
7ca15a0a | 770 | scan_width = cfg80211_chandef_to_scan_width(&ifibss->chandef); |
34bcf715 | 771 | ieee80211_request_ibss_scan(sdata, ifibss->ssid, ifibss->ssid_len, |
7ca15a0a | 772 | NULL, scan_width); |
46900298 JB |
773 | } |
774 | ||
af8cdcd8 | 775 | static void ieee80211_sta_create_ibss(struct ieee80211_sub_if_data *sdata) |
46900298 JB |
776 | { |
777 | struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; | |
46900298 | 778 | u8 bssid[ETH_ALEN]; |
46900298 JB |
779 | u16 capability; |
780 | int i; | |
781 | ||
8d61ffa5 | 782 | sdata_assert_lock(sdata); |
7a17a33c | 783 | |
af8cdcd8 | 784 | if (ifibss->fixed_bssid) { |
46900298 JB |
785 | memcpy(bssid, ifibss->bssid, ETH_ALEN); |
786 | } else { | |
787 | /* Generate random, not broadcast, locally administered BSSID. Mix in | |
788 | * own MAC address to make sure that devices that do not have proper | |
789 | * random number generator get different BSSID. */ | |
790 | get_random_bytes(bssid, ETH_ALEN); | |
791 | for (i = 0; i < ETH_ALEN; i++) | |
47846c9b | 792 | bssid[i] ^= sdata->vif.addr[i]; |
46900298 JB |
793 | bssid[0] &= ~0x01; |
794 | bssid[0] |= 0x02; | |
795 | } | |
796 | ||
bdcbd8e0 | 797 | sdata_info(sdata, "Creating new IBSS network, BSSID %pM\n", bssid); |
46900298 | 798 | |
46900298 JB |
799 | capability = WLAN_CAPABILITY_IBSS; |
800 | ||
fffd0934 | 801 | if (ifibss->privacy) |
46900298 JB |
802 | capability |= WLAN_CAPABILITY_PRIVACY; |
803 | else | |
804 | sdata->drop_unencrypted = 0; | |
805 | ||
57c4d7b4 | 806 | __ieee80211_sta_join_ibss(sdata, bssid, sdata->vif.bss_conf.beacon_int, |
3aede78a | 807 | ifibss->chandef.chan, ifibss->basic_rates, |
c13a765b | 808 | capability, 0, true); |
46900298 JB |
809 | } |
810 | ||
ce9058ae BP |
811 | /* |
812 | * This function is called with state == IEEE80211_IBSS_MLME_SEARCH | |
813 | */ | |
814 | ||
af8cdcd8 | 815 | static void ieee80211_sta_find_ibss(struct ieee80211_sub_if_data *sdata) |
46900298 JB |
816 | { |
817 | struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; | |
818 | struct ieee80211_local *local = sdata->local; | |
0c1ad2ca | 819 | struct cfg80211_bss *cbss; |
af8cdcd8 | 820 | struct ieee80211_channel *chan = NULL; |
46900298 | 821 | const u8 *bssid = NULL; |
7ca15a0a | 822 | enum nl80211_bss_scan_width scan_width; |
46900298 | 823 | int active_ibss; |
e0d61887 | 824 | u16 capability; |
46900298 | 825 | |
8d61ffa5 | 826 | sdata_assert_lock(sdata); |
7a17a33c | 827 | |
46900298 | 828 | active_ibss = ieee80211_sta_active_ibss(sdata); |
bdcbd8e0 | 829 | ibss_dbg(sdata, "sta_find_ibss (active_ibss=%d)\n", active_ibss); |
46900298 JB |
830 | |
831 | if (active_ibss) | |
af8cdcd8 | 832 | return; |
46900298 | 833 | |
e0d61887 | 834 | capability = WLAN_CAPABILITY_IBSS; |
fffd0934 | 835 | if (ifibss->privacy) |
e0d61887 | 836 | capability |= WLAN_CAPABILITY_PRIVACY; |
af8cdcd8 JB |
837 | if (ifibss->fixed_bssid) |
838 | bssid = ifibss->bssid; | |
839 | if (ifibss->fixed_channel) | |
3aede78a | 840 | chan = ifibss->chandef.chan; |
af8cdcd8 | 841 | if (!is_zero_ether_addr(ifibss->bssid)) |
46900298 | 842 | bssid = ifibss->bssid; |
0c1ad2ca JB |
843 | cbss = cfg80211_get_bss(local->hw.wiphy, chan, bssid, |
844 | ifibss->ssid, ifibss->ssid_len, | |
845 | WLAN_CAPABILITY_IBSS | WLAN_CAPABILITY_PRIVACY, | |
846 | capability); | |
847 | ||
848 | if (cbss) { | |
849 | struct ieee80211_bss *bss; | |
46900298 | 850 | |
0c1ad2ca | 851 | bss = (void *)cbss->priv; |
bdcbd8e0 JB |
852 | ibss_dbg(sdata, |
853 | "sta_find_ibss: selected %pM current %pM\n", | |
854 | cbss->bssid, ifibss->bssid); | |
855 | sdata_info(sdata, | |
856 | "Selected IBSS BSSID %pM based on configured SSID\n", | |
857 | cbss->bssid); | |
46900298 | 858 | |
af8cdcd8 | 859 | ieee80211_sta_join_ibss(sdata, bss); |
46900298 | 860 | ieee80211_rx_bss_put(local, bss); |
af8cdcd8 | 861 | return; |
d419b9f0 | 862 | } |
46900298 | 863 | |
bdcbd8e0 | 864 | ibss_dbg(sdata, "sta_find_ibss: did not try to join ibss\n"); |
46900298 JB |
865 | |
866 | /* Selected IBSS not found in current scan results - try to scan */ | |
ce9058ae | 867 | if (time_after(jiffies, ifibss->last_scan_completed + |
46900298 | 868 | IEEE80211_SCAN_INTERVAL)) { |
bdcbd8e0 | 869 | sdata_info(sdata, "Trigger new scan to find an IBSS to join\n"); |
46900298 | 870 | |
7ca15a0a | 871 | scan_width = cfg80211_chandef_to_scan_width(&ifibss->chandef); |
34bcf715 | 872 | ieee80211_request_ibss_scan(sdata, ifibss->ssid, |
7ca15a0a SW |
873 | ifibss->ssid_len, chan, |
874 | scan_width); | |
ce9058ae | 875 | } else { |
46900298 JB |
876 | int interval = IEEE80211_SCAN_INTERVAL; |
877 | ||
878 | if (time_after(jiffies, ifibss->ibss_join_req + | |
55de908a JB |
879 | IEEE80211_IBSS_JOIN_TIMEOUT)) |
880 | ieee80211_sta_create_ibss(sdata); | |
46900298 | 881 | |
af8cdcd8 JB |
882 | mod_timer(&ifibss->timer, |
883 | round_jiffies(jiffies + interval)); | |
46900298 | 884 | } |
46900298 JB |
885 | } |
886 | ||
887 | static void ieee80211_rx_mgmt_probe_req(struct ieee80211_sub_if_data *sdata, | |
c269a203 | 888 | struct sk_buff *req) |
46900298 | 889 | { |
c269a203 | 890 | struct ieee80211_mgmt *mgmt = (void *)req->data; |
46900298 JB |
891 | struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; |
892 | struct ieee80211_local *local = sdata->local; | |
c269a203 | 893 | int tx_last_beacon, len = req->len; |
46900298 | 894 | struct sk_buff *skb; |
c3ffeab4 | 895 | struct beacon_data *presp; |
46900298 JB |
896 | u8 *pos, *end; |
897 | ||
8d61ffa5 | 898 | sdata_assert_lock(sdata); |
7a17a33c | 899 | |
40b275b6 | 900 | presp = rcu_dereference_protected(ifibss->presp, |
8d61ffa5 | 901 | lockdep_is_held(&sdata->wdev.mtx)); |
40b275b6 | 902 | |
46900298 | 903 | if (ifibss->state != IEEE80211_IBSS_MLME_JOINED || |
40b275b6 | 904 | len < 24 + 2 || !presp) |
46900298 JB |
905 | return; |
906 | ||
24487981 | 907 | tx_last_beacon = drv_tx_last_beacon(local); |
46900298 | 908 | |
bdcbd8e0 JB |
909 | ibss_dbg(sdata, |
910 | "RX ProbeReq SA=%pM DA=%pM BSSID=%pM (tx_last_beacon=%d)\n", | |
911 | mgmt->sa, mgmt->da, mgmt->bssid, tx_last_beacon); | |
46900298 | 912 | |
1ed76487 | 913 | if (!tx_last_beacon && is_multicast_ether_addr(mgmt->da)) |
46900298 JB |
914 | return; |
915 | ||
b203ca39 | 916 | if (!ether_addr_equal(mgmt->bssid, ifibss->bssid) && |
888d04df | 917 | !is_broadcast_ether_addr(mgmt->bssid)) |
46900298 JB |
918 | return; |
919 | ||
920 | end = ((u8 *) mgmt) + len; | |
921 | pos = mgmt->u.probe_req.variable; | |
922 | if (pos[0] != WLAN_EID_SSID || | |
923 | pos + 2 + pos[1] > end) { | |
bdcbd8e0 JB |
924 | ibss_dbg(sdata, "Invalid SSID IE in ProbeReq from %pM\n", |
925 | mgmt->sa); | |
46900298 JB |
926 | return; |
927 | } | |
928 | if (pos[1] != 0 && | |
929 | (pos[1] != ifibss->ssid_len || | |
0da780c2 | 930 | memcmp(pos + 2, ifibss->ssid, ifibss->ssid_len))) { |
46900298 JB |
931 | /* Ignore ProbeReq for foreign SSID */ |
932 | return; | |
933 | } | |
934 | ||
935 | /* Reply with ProbeResp */ | |
c3ffeab4 | 936 | skb = dev_alloc_skb(local->tx_headroom + presp->head_len); |
46900298 JB |
937 | if (!skb) |
938 | return; | |
939 | ||
c3ffeab4 JB |
940 | skb_reserve(skb, local->tx_headroom); |
941 | memcpy(skb_put(skb, presp->head_len), presp->head, presp->head_len); | |
942 | ||
943 | memcpy(((struct ieee80211_mgmt *) skb->data)->da, mgmt->sa, ETH_ALEN); | |
944 | ibss_dbg(sdata, "Sending ProbeResp to %pM\n", mgmt->sa); | |
62ae67be JB |
945 | IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT; |
946 | ieee80211_tx_skb(sdata, skb); | |
46900298 JB |
947 | } |
948 | ||
d45c4172 EG |
949 | static |
950 | void ieee80211_rx_mgmt_probe_beacon(struct ieee80211_sub_if_data *sdata, | |
951 | struct ieee80211_mgmt *mgmt, size_t len, | |
952 | struct ieee80211_rx_status *rx_status) | |
46900298 JB |
953 | { |
954 | size_t baselen; | |
955 | struct ieee802_11_elems elems; | |
956 | ||
d45c4172 EG |
957 | BUILD_BUG_ON(offsetof(typeof(mgmt->u.probe_resp), variable) != |
958 | offsetof(typeof(mgmt->u.beacon), variable)); | |
959 | ||
960 | /* | |
961 | * either beacon or probe_resp but the variable field is at the | |
962 | * same offset | |
963 | */ | |
46900298 JB |
964 | baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt; |
965 | if (baselen > len) | |
966 | return; | |
967 | ||
968 | ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen, | |
b2e506bf | 969 | false, &elems); |
46900298 | 970 | |
d45c4172 | 971 | ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems); |
46900298 JB |
972 | } |
973 | ||
1fa57d01 JB |
974 | void ieee80211_ibss_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata, |
975 | struct sk_buff *skb) | |
46900298 JB |
976 | { |
977 | struct ieee80211_rx_status *rx_status; | |
978 | struct ieee80211_mgmt *mgmt; | |
979 | u16 fc; | |
980 | ||
f1d58c25 | 981 | rx_status = IEEE80211_SKB_RXCB(skb); |
46900298 JB |
982 | mgmt = (struct ieee80211_mgmt *) skb->data; |
983 | fc = le16_to_cpu(mgmt->frame_control); | |
984 | ||
8d61ffa5 | 985 | sdata_lock(sdata); |
7a17a33c | 986 | |
c926d006 TH |
987 | if (!sdata->u.ibss.ssid_len) |
988 | goto mgmt_out; /* not ready to merge yet */ | |
989 | ||
46900298 JB |
990 | switch (fc & IEEE80211_FCTL_STYPE) { |
991 | case IEEE80211_STYPE_PROBE_REQ: | |
c269a203 | 992 | ieee80211_rx_mgmt_probe_req(sdata, skb); |
46900298 JB |
993 | break; |
994 | case IEEE80211_STYPE_PROBE_RESP: | |
46900298 | 995 | case IEEE80211_STYPE_BEACON: |
d45c4172 EG |
996 | ieee80211_rx_mgmt_probe_beacon(sdata, mgmt, skb->len, |
997 | rx_status); | |
46900298 JB |
998 | break; |
999 | case IEEE80211_STYPE_AUTH: | |
1000 | ieee80211_rx_mgmt_auth_ibss(sdata, mgmt, skb->len); | |
1001 | break; | |
2cc59e78 AQ |
1002 | case IEEE80211_STYPE_DEAUTH: |
1003 | ieee80211_rx_mgmt_deauth_ibss(sdata, mgmt, skb->len); | |
1004 | break; | |
46900298 | 1005 | } |
7a17a33c | 1006 | |
c926d006 | 1007 | mgmt_out: |
8d61ffa5 | 1008 | sdata_unlock(sdata); |
46900298 JB |
1009 | } |
1010 | ||
1fa57d01 | 1011 | void ieee80211_ibss_work(struct ieee80211_sub_if_data *sdata) |
46900298 | 1012 | { |
1fa57d01 | 1013 | struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; |
8bf11d8d | 1014 | struct sta_info *sta; |
46900298 | 1015 | |
8d61ffa5 | 1016 | sdata_lock(sdata); |
7a17a33c JB |
1017 | |
1018 | /* | |
1019 | * Work could be scheduled after scan or similar | |
1020 | * when we aren't even joined (or trying) with a | |
1021 | * network. | |
1022 | */ | |
1023 | if (!ifibss->ssid_len) | |
1024 | goto out; | |
46900298 | 1025 | |
8bf11d8d JB |
1026 | spin_lock_bh(&ifibss->incomplete_lock); |
1027 | while (!list_empty(&ifibss->incomplete_stations)) { | |
1028 | sta = list_first_entry(&ifibss->incomplete_stations, | |
1029 | struct sta_info, list); | |
1030 | list_del(&sta->list); | |
1031 | spin_unlock_bh(&ifibss->incomplete_lock); | |
1032 | ||
52874a5e | 1033 | ieee80211_ibss_finish_sta(sta); |
8bf11d8d JB |
1034 | rcu_read_unlock(); |
1035 | spin_lock_bh(&ifibss->incomplete_lock); | |
1036 | } | |
1037 | spin_unlock_bh(&ifibss->incomplete_lock); | |
1038 | ||
46900298 JB |
1039 | switch (ifibss->state) { |
1040 | case IEEE80211_IBSS_MLME_SEARCH: | |
1041 | ieee80211_sta_find_ibss(sdata); | |
1042 | break; | |
1043 | case IEEE80211_IBSS_MLME_JOINED: | |
1044 | ieee80211_sta_merge_ibss(sdata); | |
1045 | break; | |
1046 | default: | |
1047 | WARN_ON(1); | |
1048 | break; | |
1049 | } | |
46900298 | 1050 | |
7a17a33c | 1051 | out: |
8d61ffa5 | 1052 | sdata_unlock(sdata); |
3a4d4aa2 JB |
1053 | } |
1054 | ||
46900298 JB |
1055 | static void ieee80211_ibss_timer(unsigned long data) |
1056 | { | |
1057 | struct ieee80211_sub_if_data *sdata = | |
1058 | (struct ieee80211_sub_if_data *) data; | |
5bb644a0 | 1059 | |
a6182943 | 1060 | ieee80211_queue_work(&sdata->local->hw, &sdata->work); |
5bb644a0 | 1061 | } |
5bb644a0 | 1062 | |
46900298 JB |
1063 | void ieee80211_ibss_setup_sdata(struct ieee80211_sub_if_data *sdata) |
1064 | { | |
1065 | struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; | |
1066 | ||
46900298 JB |
1067 | setup_timer(&ifibss->timer, ieee80211_ibss_timer, |
1068 | (unsigned long) sdata); | |
8bf11d8d JB |
1069 | INIT_LIST_HEAD(&ifibss->incomplete_stations); |
1070 | spin_lock_init(&ifibss->incomplete_lock); | |
46900298 JB |
1071 | } |
1072 | ||
1073 | /* scan finished notification */ | |
1074 | void ieee80211_ibss_notify_scan_completed(struct ieee80211_local *local) | |
1075 | { | |
af8cdcd8 | 1076 | struct ieee80211_sub_if_data *sdata; |
46900298 | 1077 | |
29b4a4f7 JB |
1078 | mutex_lock(&local->iflist_mtx); |
1079 | list_for_each_entry(sdata, &local->interfaces, list) { | |
9607e6b6 | 1080 | if (!ieee80211_sdata_running(sdata)) |
0e41f715 | 1081 | continue; |
af8cdcd8 JB |
1082 | if (sdata->vif.type != NL80211_IFTYPE_ADHOC) |
1083 | continue; | |
1084 | sdata->u.ibss.last_scan_completed = jiffies; | |
7a17a33c | 1085 | ieee80211_queue_work(&local->hw, &sdata->work); |
46900298 | 1086 | } |
29b4a4f7 | 1087 | mutex_unlock(&local->iflist_mtx); |
46900298 JB |
1088 | } |
1089 | ||
af8cdcd8 JB |
1090 | int ieee80211_ibss_join(struct ieee80211_sub_if_data *sdata, |
1091 | struct cfg80211_ibss_params *params) | |
1092 | { | |
ff3cc5f4 | 1093 | u32 changed = 0; |
2103dec1 SW |
1094 | u32 rate_flags; |
1095 | struct ieee80211_supported_band *sband; | |
1096 | int i; | |
af8cdcd8 | 1097 | |
af8cdcd8 JB |
1098 | if (params->bssid) { |
1099 | memcpy(sdata->u.ibss.bssid, params->bssid, ETH_ALEN); | |
1100 | sdata->u.ibss.fixed_bssid = true; | |
1101 | } else | |
1102 | sdata->u.ibss.fixed_bssid = false; | |
1103 | ||
fffd0934 | 1104 | sdata->u.ibss.privacy = params->privacy; |
267335d6 | 1105 | sdata->u.ibss.control_port = params->control_port; |
fbd2c8dc | 1106 | sdata->u.ibss.basic_rates = params->basic_rates; |
2103dec1 SW |
1107 | |
1108 | /* fix basic_rates if channel does not support these rates */ | |
1109 | rate_flags = ieee80211_chandef_rate_flags(¶ms->chandef); | |
1110 | sband = sdata->local->hw.wiphy->bands[params->chandef.chan->band]; | |
1111 | for (i = 0; i < sband->n_bitrates; i++) { | |
1112 | if ((rate_flags & sband->bitrates[i].flags) != rate_flags) | |
1113 | sdata->u.ibss.basic_rates &= ~BIT(i); | |
1114 | } | |
dd5b4cc7 FF |
1115 | memcpy(sdata->vif.bss_conf.mcast_rate, params->mcast_rate, |
1116 | sizeof(params->mcast_rate)); | |
fffd0934 | 1117 | |
57c4d7b4 JB |
1118 | sdata->vif.bss_conf.beacon_int = params->beacon_interval; |
1119 | ||
3aede78a | 1120 | sdata->u.ibss.chandef = params->chandef; |
af8cdcd8 JB |
1121 | sdata->u.ibss.fixed_channel = params->channel_fixed; |
1122 | ||
1123 | if (params->ie) { | |
1124 | sdata->u.ibss.ie = kmemdup(params->ie, params->ie_len, | |
1125 | GFP_KERNEL); | |
1126 | if (sdata->u.ibss.ie) | |
1127 | sdata->u.ibss.ie_len = params->ie_len; | |
1128 | } | |
1129 | ||
af8cdcd8 JB |
1130 | sdata->u.ibss.state = IEEE80211_IBSS_MLME_SEARCH; |
1131 | sdata->u.ibss.ibss_join_req = jiffies; | |
1132 | ||
badecb00 | 1133 | memcpy(sdata->u.ibss.ssid, params->ssid, params->ssid_len); |
0e41f715 JB |
1134 | sdata->u.ibss.ssid_len = params->ssid_len; |
1135 | ||
822854b0 SW |
1136 | memcpy(&sdata->u.ibss.ht_capa, ¶ms->ht_capa, |
1137 | sizeof(sdata->u.ibss.ht_capa)); | |
1138 | memcpy(&sdata->u.ibss.ht_capa_mask, ¶ms->ht_capa_mask, | |
1139 | sizeof(sdata->u.ibss.ht_capa_mask)); | |
1140 | ||
ff3cc5f4 SW |
1141 | /* |
1142 | * 802.11n-2009 9.13.3.1: In an IBSS, the HT Protection field is | |
1143 | * reserved, but an HT STA shall protect HT transmissions as though | |
1144 | * the HT Protection field were set to non-HT mixed mode. | |
1145 | * | |
1146 | * In an IBSS, the RIFS Mode field of the HT Operation element is | |
1147 | * also reserved, but an HT STA shall operate as though this field | |
1148 | * were set to 1. | |
1149 | */ | |
1150 | ||
1151 | sdata->vif.bss_conf.ht_operation_mode |= | |
1152 | IEEE80211_HT_OP_MODE_PROTECTION_NONHT_MIXED | |
1153 | | IEEE80211_HT_PARAM_RIFS_MODE; | |
1154 | ||
1155 | changed |= BSS_CHANGED_HT; | |
1156 | ieee80211_bss_info_change_notify(sdata, changed); | |
1157 | ||
04ecd257 JB |
1158 | sdata->smps_mode = IEEE80211_SMPS_OFF; |
1159 | sdata->needed_rx_chains = sdata->local->rx_chains; | |
1160 | ||
64592c8f | 1161 | ieee80211_queue_work(&sdata->local->hw, &sdata->work); |
af8cdcd8 JB |
1162 | |
1163 | return 0; | |
1164 | } | |
1165 | ||
1166 | int ieee80211_ibss_leave(struct ieee80211_sub_if_data *sdata) | |
1167 | { | |
5ea096c0 TP |
1168 | struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; |
1169 | struct ieee80211_local *local = sdata->local; | |
1170 | struct cfg80211_bss *cbss; | |
1171 | u16 capability; | |
7a17a33c | 1172 | int active_ibss; |
8bf11d8d | 1173 | struct sta_info *sta; |
c3ffeab4 | 1174 | struct beacon_data *presp; |
7a17a33c | 1175 | |
5ea096c0 TP |
1176 | active_ibss = ieee80211_sta_active_ibss(sdata); |
1177 | ||
1178 | if (!active_ibss && !is_zero_ether_addr(ifibss->bssid)) { | |
1179 | capability = WLAN_CAPABILITY_IBSS; | |
1180 | ||
1181 | if (ifibss->privacy) | |
1182 | capability |= WLAN_CAPABILITY_PRIVACY; | |
1183 | ||
3aede78a | 1184 | cbss = cfg80211_get_bss(local->hw.wiphy, ifibss->chandef.chan, |
5ea096c0 TP |
1185 | ifibss->bssid, ifibss->ssid, |
1186 | ifibss->ssid_len, WLAN_CAPABILITY_IBSS | | |
1187 | WLAN_CAPABILITY_PRIVACY, | |
1188 | capability); | |
1189 | ||
1190 | if (cbss) { | |
1191 | cfg80211_unlink_bss(local->hw.wiphy, cbss); | |
5b112d3d | 1192 | cfg80211_put_bss(local->hw.wiphy, cbss); |
5ea096c0 TP |
1193 | } |
1194 | } | |
af8cdcd8 | 1195 | |
b78a4932 SW |
1196 | ifibss->state = IEEE80211_IBSS_MLME_SEARCH; |
1197 | memset(ifibss->bssid, 0, ETH_ALEN); | |
1198 | ifibss->ssid_len = 0; | |
1199 | ||
b998e8bb | 1200 | sta_info_flush(sdata); |
8bf11d8d JB |
1201 | |
1202 | spin_lock_bh(&ifibss->incomplete_lock); | |
1203 | while (!list_empty(&ifibss->incomplete_stations)) { | |
1204 | sta = list_first_entry(&ifibss->incomplete_stations, | |
1205 | struct sta_info, list); | |
1206 | list_del(&sta->list); | |
1207 | spin_unlock_bh(&ifibss->incomplete_lock); | |
1208 | ||
1209 | sta_info_free(local, sta); | |
1210 | spin_lock_bh(&ifibss->incomplete_lock); | |
1211 | } | |
1212 | spin_unlock_bh(&ifibss->incomplete_lock); | |
1213 | ||
86a2ea41 | 1214 | netif_carrier_off(sdata->dev); |
af8cdcd8 JB |
1215 | |
1216 | /* remove beacon */ | |
1217 | kfree(sdata->u.ibss.ie); | |
c3ffeab4 | 1218 | presp = rcu_dereference_protected(ifibss->presp, |
8d61ffa5 | 1219 | lockdep_is_held(&sdata->wdev.mtx)); |
a9b3cd7f | 1220 | RCU_INIT_POINTER(sdata->u.ibss.presp, NULL); |
822854b0 SW |
1221 | |
1222 | /* on the next join, re-program HT parameters */ | |
1223 | memset(&ifibss->ht_capa, 0, sizeof(ifibss->ht_capa)); | |
1224 | memset(&ifibss->ht_capa_mask, 0, sizeof(ifibss->ht_capa_mask)); | |
1225 | ||
8fc214ba | 1226 | sdata->vif.bss_conf.ibss_joined = false; |
c13a765b | 1227 | sdata->vif.bss_conf.ibss_creator = false; |
d6a83228 | 1228 | sdata->vif.bss_conf.enable_beacon = false; |
0ca54f6c | 1229 | sdata->vif.bss_conf.ssid_len = 0; |
d6a83228 | 1230 | clear_bit(SDATA_STATE_OFFCHANNEL_BEACON_STOPPED, &sdata->state); |
8fc214ba JB |
1231 | ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BEACON_ENABLED | |
1232 | BSS_CHANGED_IBSS); | |
af8cdcd8 | 1233 | synchronize_rcu(); |
c3ffeab4 | 1234 | kfree(presp); |
af8cdcd8 | 1235 | |
35f20c14 | 1236 | skb_queue_purge(&sdata->skb_queue); |
5cff20e6 | 1237 | |
bc05d19f | 1238 | del_timer_sync(&sdata->u.ibss.timer); |
7a17a33c | 1239 | |
af8cdcd8 JB |
1240 | return 0; |
1241 | } |