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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> |
16 | #include <linux/slab.h> |
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> |
23 | #include <asm/unaligned.h> |
24 | |
25 | #include "ieee80211_i.h" |
26 | #include "driver-ops.h" |
27 | #include "rate.h" |
28 | |
29 | #define IEEE80211_SCAN_INTERVAL (2 * HZ) |
30 | #define IEEE80211_SCAN_INTERVAL_SLOW (15 * HZ) |
31 | #define IEEE80211_IBSS_JOIN_TIMEOUT (7 * HZ) |
32 | |
33 | #define IEEE80211_IBSS_MERGE_INTERVAL (30 * HZ) |
34 | #define IEEE80211_IBSS_MERGE_DELAY 0x400000 |
35 | #define IEEE80211_IBSS_INACTIVITY_LIMIT (60 * HZ) |
36 | |
37 | #define IEEE80211_IBSS_MAX_STA_ENTRIES 128 |
38 | |
39 | |
40 | static void ieee80211_rx_mgmt_auth_ibss(struct ieee80211_sub_if_data *sdata, |
41 | struct ieee80211_mgmt *mgmt, |
42 | size_t len) |
43 | { |
44 | u16 auth_alg, auth_transaction, status_code; |
45 | |
46 | if (len < 24 + 6) |
47 | return; |
48 | |
49 | auth_alg = le16_to_cpu(mgmt->u.auth.auth_alg); |
50 | auth_transaction = le16_to_cpu(mgmt->u.auth.auth_transaction); |
51 | status_code = le16_to_cpu(mgmt->u.auth.status_code); |
52 | |
53 | /* |
54 | * IEEE 802.11 standard does not require authentication in IBSS |
55 | * networks and most implementations do not seem to use it. |
56 | * However, try to reply to authentication attempts if someone |
57 | * has actually implemented this. |
58 | */ |
59 | if (auth_alg == WLAN_AUTH_OPEN && auth_transaction == 1) |
60 | ieee80211_send_auth(sdata, 2, WLAN_AUTH_OPEN, NULL, 0, |
61 | sdata->u.ibss.bssid, NULL, 0, 0); |
62 | } |
63 | |
64 | static void __ieee80211_sta_join_ibss(struct ieee80211_sub_if_data *sdata, |
65 | const u8 *bssid, const int beacon_int, |
66 | struct ieee80211_channel *chan, |
67 | const u32 basic_rates, |
68 | const u16 capability, u64 tsf) |
69 | { |
70 | struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; |
71 | struct ieee80211_local *local = sdata->local; |
72 | int rates, i; |
73 | struct sk_buff *skb; |
74 | struct ieee80211_mgmt *mgmt; |
75 | u8 *pos; |
76 | struct ieee80211_supported_band *sband; |
77 | struct cfg80211_bss *bss; |
78 | u32 bss_change; |
79 | u8 supp_rates[IEEE80211_MAX_SUPP_RATES]; |
80 | |
81 | /* Reset own TSF to allow time synchronization work. */ |
82 | drv_reset_tsf(local); |
83 | |
84 | skb = ifibss->skb; |
85 | rcu_assign_pointer(ifibss->presp, NULL); |
86 | synchronize_rcu(); |
87 | skb->data = skb->head; |
88 | skb->len = 0; |
89 | skb_reset_tail_pointer(skb); |
90 | skb_reserve(skb, sdata->local->hw.extra_tx_headroom); |
91 | |
92 | if (memcmp(ifibss->bssid, bssid, ETH_ALEN)) |
93 | sta_info_flush(sdata->local, sdata); |
94 | |
95 | memcpy(ifibss->bssid, bssid, ETH_ALEN); |
96 | |
97 | sdata->drop_unencrypted = capability & WLAN_CAPABILITY_PRIVACY ? 1 : 0; |
98 | |
99 | local->oper_channel = chan; |
100 | local->oper_channel_type = NL80211_CHAN_NO_HT; |
101 | ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_CHANNEL); |
102 | |
103 | sband = local->hw.wiphy->bands[chan->band]; |
104 | |
105 | /* build supported rates array */ |
106 | pos = supp_rates; |
107 | for (i = 0; i < sband->n_bitrates; i++) { |
108 | int rate = sband->bitrates[i].bitrate; |
109 | u8 basic = 0; |
110 | if (basic_rates & BIT(i)) |
111 | basic = 0x80; |
112 | *pos++ = basic | (u8) (rate / 5); |
113 | } |
114 | |
115 | /* Build IBSS probe response */ |
116 | mgmt = (void *) skb_put(skb, 24 + sizeof(mgmt->u.beacon)); |
117 | memset(mgmt, 0, 24 + sizeof(mgmt->u.beacon)); |
118 | mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | |
119 | IEEE80211_STYPE_PROBE_RESP); |
120 | memset(mgmt->da, 0xff, ETH_ALEN); |
121 | memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN); |
122 | memcpy(mgmt->bssid, ifibss->bssid, ETH_ALEN); |
123 | mgmt->u.beacon.beacon_int = cpu_to_le16(beacon_int); |
124 | mgmt->u.beacon.timestamp = cpu_to_le64(tsf); |
125 | mgmt->u.beacon.capab_info = cpu_to_le16(capability); |
126 | |
127 | pos = skb_put(skb, 2 + ifibss->ssid_len); |
128 | *pos++ = WLAN_EID_SSID; |
129 | *pos++ = ifibss->ssid_len; |
130 | memcpy(pos, ifibss->ssid, ifibss->ssid_len); |
131 | |
132 | rates = sband->n_bitrates; |
133 | if (rates > 8) |
134 | rates = 8; |
135 | pos = skb_put(skb, 2 + rates); |
136 | *pos++ = WLAN_EID_SUPP_RATES; |
137 | *pos++ = rates; |
138 | memcpy(pos, supp_rates, rates); |
139 | |
140 | if (sband->band == IEEE80211_BAND_2GHZ) { |
141 | pos = skb_put(skb, 2 + 1); |
142 | *pos++ = WLAN_EID_DS_PARAMS; |
143 | *pos++ = 1; |
144 | *pos++ = ieee80211_frequency_to_channel(chan->center_freq); |
145 | } |
146 | |
147 | pos = skb_put(skb, 2 + 2); |
148 | *pos++ = WLAN_EID_IBSS_PARAMS; |
149 | *pos++ = 2; |
150 | /* FIX: set ATIM window based on scan results */ |
151 | *pos++ = 0; |
152 | *pos++ = 0; |
153 | |
154 | if (sband->n_bitrates > 8) { |
155 | rates = sband->n_bitrates - 8; |
156 | pos = skb_put(skb, 2 + rates); |
157 | *pos++ = WLAN_EID_EXT_SUPP_RATES; |
158 | *pos++ = rates; |
159 | memcpy(pos, &supp_rates[8], rates); |
160 | } |
161 | |
162 | if (ifibss->ie_len) |
163 | memcpy(skb_put(skb, ifibss->ie_len), |
164 | ifibss->ie, ifibss->ie_len); |
165 | |
166 | rcu_assign_pointer(ifibss->presp, skb); |
167 | |
168 | sdata->vif.bss_conf.beacon_int = beacon_int; |
169 | bss_change = BSS_CHANGED_BEACON_INT; |
170 | bss_change |= ieee80211_reset_erp_info(sdata); |
171 | bss_change |= BSS_CHANGED_BSSID; |
172 | bss_change |= BSS_CHANGED_BEACON; |
173 | bss_change |= BSS_CHANGED_BEACON_ENABLED; |
174 | ieee80211_bss_info_change_notify(sdata, bss_change); |
175 | |
176 | ieee80211_sta_def_wmm_params(sdata, sband->n_bitrates, supp_rates); |
177 | |
178 | ifibss->state = IEEE80211_IBSS_MLME_JOINED; |
179 | mod_timer(&ifibss->timer, |
180 | round_jiffies(jiffies + IEEE80211_IBSS_MERGE_INTERVAL)); |
181 | |
182 | bss = cfg80211_inform_bss_frame(local->hw.wiphy, local->hw.conf.channel, |
183 | mgmt, skb->len, 0, GFP_KERNEL); |
184 | cfg80211_put_bss(bss); |
185 | cfg80211_ibss_joined(sdata->dev, ifibss->bssid, GFP_KERNEL); |
186 | } |
187 | |
188 | static void ieee80211_sta_join_ibss(struct ieee80211_sub_if_data *sdata, |
189 | struct ieee80211_bss *bss) |
190 | { |
191 | struct cfg80211_bss *cbss = |
192 | container_of((void *)bss, struct cfg80211_bss, priv); |
193 | struct ieee80211_supported_band *sband; |
194 | u32 basic_rates; |
195 | int i, j; |
196 | u16 beacon_int = cbss->beacon_interval; |
197 | |
198 | if (beacon_int < 10) |
199 | beacon_int = 10; |
200 | |
201 | sband = sdata->local->hw.wiphy->bands[cbss->channel->band]; |
202 | |
203 | basic_rates = 0; |
204 | |
205 | for (i = 0; i < bss->supp_rates_len; i++) { |
206 | int rate = (bss->supp_rates[i] & 0x7f) * 5; |
207 | bool is_basic = !!(bss->supp_rates[i] & 0x80); |
208 | |
209 | for (j = 0; j < sband->n_bitrates; j++) { |
210 | if (sband->bitrates[j].bitrate == rate) { |
211 | if (is_basic) |
212 | basic_rates |= BIT(j); |
213 | break; |
214 | } |
215 | } |
216 | } |
217 | |
218 | __ieee80211_sta_join_ibss(sdata, cbss->bssid, |
219 | beacon_int, |
220 | cbss->channel, |
221 | basic_rates, |
222 | cbss->capability, |
223 | cbss->tsf); |
224 | } |
225 | |
226 | static void ieee80211_rx_bss_info(struct ieee80211_sub_if_data *sdata, |
227 | struct ieee80211_mgmt *mgmt, |
228 | size_t len, |
229 | struct ieee80211_rx_status *rx_status, |
230 | struct ieee802_11_elems *elems, |
231 | bool beacon) |
232 | { |
233 | struct ieee80211_local *local = sdata->local; |
234 | int freq; |
235 | struct cfg80211_bss *cbss; |
236 | struct ieee80211_bss *bss; |
237 | struct sta_info *sta; |
238 | struct ieee80211_channel *channel; |
239 | u64 beacon_timestamp, rx_timestamp; |
240 | u32 supp_rates = 0; |
241 | enum ieee80211_band band = rx_status->band; |
242 | |
243 | if (elems->ds_params && elems->ds_params_len == 1) |
244 | freq = ieee80211_channel_to_frequency(elems->ds_params[0]); |
245 | else |
246 | freq = rx_status->freq; |
247 | |
248 | channel = ieee80211_get_channel(local->hw.wiphy, freq); |
249 | |
250 | if (!channel || channel->flags & IEEE80211_CHAN_DISABLED) |
251 | return; |
252 | |
253 | if (sdata->vif.type == NL80211_IFTYPE_ADHOC && elems->supp_rates && |
254 | memcmp(mgmt->bssid, sdata->u.ibss.bssid, ETH_ALEN) == 0) { |
255 | supp_rates = ieee80211_sta_get_rates(local, elems, band); |
256 | |
257 | rcu_read_lock(); |
258 | |
259 | sta = sta_info_get(sdata, mgmt->sa); |
260 | if (sta) { |
261 | u32 prev_rates; |
262 | |
263 | prev_rates = sta->sta.supp_rates[band]; |
264 | /* make sure mandatory rates are always added */ |
265 | sta->sta.supp_rates[band] = supp_rates | |
266 | ieee80211_mandatory_rates(local, band); |
267 | |
268 | #ifdef CONFIG_MAC80211_IBSS_DEBUG |
269 | if (sta->sta.supp_rates[band] != prev_rates) |
270 | printk(KERN_DEBUG "%s: updated supp_rates set " |
271 | "for %pM based on beacon info (0x%llx | " |
272 | "0x%llx -> 0x%llx)\n", |
273 | sdata->name, |
274 | sta->sta.addr, |
275 | (unsigned long long) prev_rates, |
276 | (unsigned long long) supp_rates, |
277 | (unsigned long long) sta->sta.supp_rates[band]); |
278 | #endif |
279 | rcu_read_unlock(); |
280 | } else { |
281 | rcu_read_unlock(); |
282 | ieee80211_ibss_add_sta(sdata, mgmt->bssid, mgmt->sa, |
283 | supp_rates, GFP_KERNEL); |
284 | } |
285 | } |
286 | |
287 | bss = ieee80211_bss_info_update(local, rx_status, mgmt, len, elems, |
288 | channel, beacon); |
289 | if (!bss) |
290 | return; |
291 | |
292 | cbss = container_of((void *)bss, struct cfg80211_bss, priv); |
293 | |
294 | /* was just updated in ieee80211_bss_info_update */ |
295 | beacon_timestamp = cbss->tsf; |
296 | |
297 | /* check if we need to merge IBSS */ |
298 | |
299 | /* we use a fixed BSSID */ |
300 | if (sdata->u.ibss.fixed_bssid) |
301 | goto put_bss; |
302 | |
303 | /* not an IBSS */ |
304 | if (!(cbss->capability & WLAN_CAPABILITY_IBSS)) |
305 | goto put_bss; |
306 | |
307 | /* different channel */ |
308 | if (cbss->channel != local->oper_channel) |
309 | goto put_bss; |
310 | |
311 | /* different SSID */ |
312 | if (elems->ssid_len != sdata->u.ibss.ssid_len || |
313 | memcmp(elems->ssid, sdata->u.ibss.ssid, |
314 | sdata->u.ibss.ssid_len)) |
315 | goto put_bss; |
316 | |
317 | /* same BSSID */ |
318 | if (memcmp(cbss->bssid, sdata->u.ibss.bssid, ETH_ALEN) == 0) |
319 | goto put_bss; |
320 | |
321 | if (rx_status->flag & RX_FLAG_TSFT) { |
322 | /* |
323 | * For correct IBSS merging we need mactime; since mactime is |
324 | * defined as the time the first data symbol of the frame hits |
325 | * the PHY, and the timestamp of the beacon is defined as "the |
326 | * time that the data symbol containing the first bit of the |
327 | * timestamp is transmitted to the PHY plus the transmitting |
328 | * STA's delays through its local PHY from the MAC-PHY |
329 | * interface to its interface with the WM" (802.11 11.1.2) |
330 | * - equals the time this bit arrives at the receiver - we have |
331 | * to take into account the offset between the two. |
332 | * |
333 | * E.g. at 1 MBit that means mactime is 192 usec earlier |
334 | * (=24 bytes * 8 usecs/byte) than the beacon timestamp. |
335 | */ |
336 | int rate; |
337 | |
338 | if (rx_status->flag & RX_FLAG_HT) |
339 | rate = 65; /* TODO: HT rates */ |
340 | else |
341 | rate = local->hw.wiphy->bands[band]-> |
342 | bitrates[rx_status->rate_idx].bitrate; |
343 | |
344 | rx_timestamp = rx_status->mactime + (24 * 8 * 10 / rate); |
345 | } else { |
346 | /* |
347 | * second best option: get current TSF |
348 | * (will return -1 if not supported) |
349 | */ |
350 | rx_timestamp = drv_get_tsf(local); |
351 | } |
352 | |
353 | #ifdef CONFIG_MAC80211_IBSS_DEBUG |
354 | printk(KERN_DEBUG "RX beacon SA=%pM BSSID=" |
355 | "%pM TSF=0x%llx BCN=0x%llx diff=%lld @%lu\n", |
356 | mgmt->sa, mgmt->bssid, |
357 | (unsigned long long)rx_timestamp, |
358 | (unsigned long long)beacon_timestamp, |
359 | (unsigned long long)(rx_timestamp - beacon_timestamp), |
360 | jiffies); |
361 | #endif |
362 | |
363 | /* give slow hardware some time to do the TSF sync */ |
364 | if (rx_timestamp < IEEE80211_IBSS_MERGE_DELAY) |
365 | goto put_bss; |
366 | |
367 | if (beacon_timestamp > rx_timestamp) { |
368 | #ifdef CONFIG_MAC80211_IBSS_DEBUG |
369 | printk(KERN_DEBUG "%s: beacon TSF higher than " |
370 | "local TSF - IBSS merge with BSSID %pM\n", |
371 | sdata->name, mgmt->bssid); |
372 | #endif |
373 | ieee80211_sta_join_ibss(sdata, bss); |
374 | ieee80211_ibss_add_sta(sdata, mgmt->bssid, mgmt->sa, |
375 | supp_rates, GFP_KERNEL); |
376 | } |
377 | |
378 | put_bss: |
379 | ieee80211_rx_bss_put(local, bss); |
380 | } |
381 | |
382 | /* |
383 | * Add a new IBSS station, will also be called by the RX code when, |
384 | * in IBSS mode, receiving a frame from a yet-unknown station, hence |
385 | * must be callable in atomic context. |
386 | */ |
387 | struct sta_info *ieee80211_ibss_add_sta(struct ieee80211_sub_if_data *sdata, |
388 | u8 *bssid,u8 *addr, u32 supp_rates, |
389 | gfp_t gfp) |
390 | { |
391 | struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; |
392 | struct ieee80211_local *local = sdata->local; |
393 | struct sta_info *sta; |
394 | int band = local->hw.conf.channel->band; |
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) { |
401 | if (net_ratelimit()) |
402 | printk(KERN_DEBUG "%s: No room for a new IBSS STA entry %pM\n", |
403 | sdata->name, addr); |
404 | return NULL; |
405 | } |
406 | |
407 | if (ifibss->state == IEEE80211_IBSS_MLME_SEARCH) |
408 | return NULL; |
409 | |
410 | if (compare_ether_addr(bssid, sdata->u.ibss.bssid)) |
411 | return NULL; |
412 | |
413 | #ifdef CONFIG_MAC80211_VERBOSE_DEBUG |
414 | printk(KERN_DEBUG "%s: Adding new IBSS station %pM (dev=%s)\n", |
415 | wiphy_name(local->hw.wiphy), addr, sdata->name); |
416 | #endif |
417 | |
418 | sta = sta_info_alloc(sdata, addr, gfp); |
419 | if (!sta) |
420 | return NULL; |
421 | |
422 | set_sta_flags(sta, WLAN_STA_AUTHORIZED); |
423 | |
424 | /* make sure mandatory rates are always added */ |
425 | sta->sta.supp_rates[band] = supp_rates | |
426 | ieee80211_mandatory_rates(local, band); |
427 | |
428 | rate_control_rate_init(sta); |
429 | |
430 | /* If it fails, maybe we raced another insertion? */ |
431 | if (sta_info_insert(sta)) |
432 | return sta_info_get(sdata, addr); |
433 | return sta; |
434 | } |
435 | |
436 | static int ieee80211_sta_active_ibss(struct ieee80211_sub_if_data *sdata) |
437 | { |
438 | struct ieee80211_local *local = sdata->local; |
439 | int active = 0; |
440 | struct sta_info *sta; |
441 | |
442 | rcu_read_lock(); |
443 | |
444 | list_for_each_entry_rcu(sta, &local->sta_list, list) { |
445 | if (sta->sdata == sdata && |
446 | time_after(sta->last_rx + IEEE80211_IBSS_MERGE_INTERVAL, |
447 | jiffies)) { |
448 | active++; |
449 | break; |
450 | } |
451 | } |
452 | |
453 | rcu_read_unlock(); |
454 | |
455 | return active; |
456 | } |
457 | |
458 | /* |
459 | * This function is called with state == IEEE80211_IBSS_MLME_JOINED |
460 | */ |
461 | |
462 | static void ieee80211_sta_merge_ibss(struct ieee80211_sub_if_data *sdata) |
463 | { |
464 | struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; |
465 | |
466 | mod_timer(&ifibss->timer, |
467 | round_jiffies(jiffies + IEEE80211_IBSS_MERGE_INTERVAL)); |
468 | |
469 | ieee80211_sta_expire(sdata, IEEE80211_IBSS_INACTIVITY_LIMIT); |
470 | |
471 | if (time_before(jiffies, ifibss->last_scan_completed + |
472 | IEEE80211_IBSS_MERGE_INTERVAL)) |
473 | return; |
474 | |
475 | if (ieee80211_sta_active_ibss(sdata)) |
476 | return; |
477 | |
478 | if (ifibss->fixed_channel) |
479 | return; |
480 | |
481 | printk(KERN_DEBUG "%s: No active IBSS STAs - trying to scan for other " |
482 | "IBSS networks with same SSID (merge)\n", sdata->name); |
483 | |
484 | ieee80211_request_internal_scan(sdata, ifibss->ssid, ifibss->ssid_len); |
485 | } |
486 | |
487 | static void ieee80211_sta_create_ibss(struct ieee80211_sub_if_data *sdata) |
488 | { |
489 | struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; |
490 | struct ieee80211_local *local = sdata->local; |
491 | struct ieee80211_supported_band *sband; |
492 | u8 bssid[ETH_ALEN]; |
493 | u16 capability; |
494 | int i; |
495 | |
496 | if (ifibss->fixed_bssid) { |
497 | memcpy(bssid, ifibss->bssid, ETH_ALEN); |
498 | } else { |
499 | /* Generate random, not broadcast, locally administered BSSID. Mix in |
500 | * own MAC address to make sure that devices that do not have proper |
501 | * random number generator get different BSSID. */ |
502 | get_random_bytes(bssid, ETH_ALEN); |
503 | for (i = 0; i < ETH_ALEN; i++) |
504 | bssid[i] ^= sdata->vif.addr[i]; |
505 | bssid[0] &= ~0x01; |
506 | bssid[0] |= 0x02; |
507 | } |
508 | |
509 | printk(KERN_DEBUG "%s: Creating new IBSS network, BSSID %pM\n", |
510 | sdata->name, bssid); |
511 | |
512 | sband = local->hw.wiphy->bands[ifibss->channel->band]; |
513 | |
514 | capability = WLAN_CAPABILITY_IBSS; |
515 | |
516 | if (ifibss->privacy) |
517 | capability |= WLAN_CAPABILITY_PRIVACY; |
518 | else |
519 | sdata->drop_unencrypted = 0; |
520 | |
521 | __ieee80211_sta_join_ibss(sdata, bssid, sdata->vif.bss_conf.beacon_int, |
522 | ifibss->channel, 3, /* first two are basic */ |
523 | capability, 0); |
524 | } |
525 | |
526 | /* |
527 | * This function is called with state == IEEE80211_IBSS_MLME_SEARCH |
528 | */ |
529 | |
530 | static void ieee80211_sta_find_ibss(struct ieee80211_sub_if_data *sdata) |
531 | { |
532 | struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; |
533 | struct ieee80211_local *local = sdata->local; |
534 | struct cfg80211_bss *cbss; |
535 | struct ieee80211_channel *chan = NULL; |
536 | const u8 *bssid = NULL; |
537 | int active_ibss; |
538 | u16 capability; |
539 | |
540 | active_ibss = ieee80211_sta_active_ibss(sdata); |
541 | #ifdef CONFIG_MAC80211_IBSS_DEBUG |
542 | printk(KERN_DEBUG "%s: sta_find_ibss (active_ibss=%d)\n", |
543 | sdata->name, active_ibss); |
544 | #endif /* CONFIG_MAC80211_IBSS_DEBUG */ |
545 | |
546 | if (active_ibss) |
547 | return; |
548 | |
549 | capability = WLAN_CAPABILITY_IBSS; |
550 | if (ifibss->privacy) |
551 | capability |= WLAN_CAPABILITY_PRIVACY; |
552 | if (ifibss->fixed_bssid) |
553 | bssid = ifibss->bssid; |
554 | if (ifibss->fixed_channel) |
555 | chan = ifibss->channel; |
556 | if (!is_zero_ether_addr(ifibss->bssid)) |
557 | bssid = ifibss->bssid; |
558 | cbss = cfg80211_get_bss(local->hw.wiphy, chan, bssid, |
559 | ifibss->ssid, ifibss->ssid_len, |
560 | WLAN_CAPABILITY_IBSS | WLAN_CAPABILITY_PRIVACY, |
561 | capability); |
562 | |
563 | if (cbss) { |
564 | struct ieee80211_bss *bss; |
565 | |
566 | bss = (void *)cbss->priv; |
567 | #ifdef CONFIG_MAC80211_IBSS_DEBUG |
568 | printk(KERN_DEBUG " sta_find_ibss: selected %pM current " |
569 | "%pM\n", cbss->bssid, ifibss->bssid); |
570 | #endif /* CONFIG_MAC80211_IBSS_DEBUG */ |
571 | |
572 | printk(KERN_DEBUG "%s: Selected IBSS BSSID %pM" |
573 | " based on configured SSID\n", |
574 | sdata->name, cbss->bssid); |
575 | |
576 | ieee80211_sta_join_ibss(sdata, bss); |
577 | ieee80211_rx_bss_put(local, bss); |
578 | return; |
579 | } |
580 | |
581 | #ifdef CONFIG_MAC80211_IBSS_DEBUG |
582 | printk(KERN_DEBUG " did not try to join ibss\n"); |
583 | #endif /* CONFIG_MAC80211_IBSS_DEBUG */ |
584 | |
585 | /* Selected IBSS not found in current scan results - try to scan */ |
586 | if (time_after(jiffies, ifibss->last_scan_completed + |
587 | IEEE80211_SCAN_INTERVAL)) { |
588 | printk(KERN_DEBUG "%s: Trigger new scan to find an IBSS to " |
589 | "join\n", sdata->name); |
590 | |
591 | ieee80211_request_internal_scan(sdata, ifibss->ssid, |
592 | ifibss->ssid_len); |
593 | } else { |
594 | int interval = IEEE80211_SCAN_INTERVAL; |
595 | |
596 | if (time_after(jiffies, ifibss->ibss_join_req + |
597 | IEEE80211_IBSS_JOIN_TIMEOUT)) { |
598 | if (!(local->oper_channel->flags & IEEE80211_CHAN_NO_IBSS)) { |
599 | ieee80211_sta_create_ibss(sdata); |
600 | return; |
601 | } |
602 | printk(KERN_DEBUG "%s: IBSS not allowed on" |
603 | " %d MHz\n", sdata->name, |
604 | local->hw.conf.channel->center_freq); |
605 | |
606 | /* No IBSS found - decrease scan interval and continue |
607 | * scanning. */ |
608 | interval = IEEE80211_SCAN_INTERVAL_SLOW; |
609 | } |
610 | |
611 | mod_timer(&ifibss->timer, |
612 | round_jiffies(jiffies + interval)); |
613 | } |
614 | } |
615 | |
616 | static void ieee80211_rx_mgmt_probe_req(struct ieee80211_sub_if_data *sdata, |
617 | struct ieee80211_mgmt *mgmt, |
618 | size_t len) |
619 | { |
620 | struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; |
621 | struct ieee80211_local *local = sdata->local; |
622 | int tx_last_beacon; |
623 | struct sk_buff *skb; |
624 | struct ieee80211_mgmt *resp; |
625 | u8 *pos, *end; |
626 | |
627 | if (ifibss->state != IEEE80211_IBSS_MLME_JOINED || |
628 | len < 24 + 2 || !ifibss->presp) |
629 | return; |
630 | |
631 | tx_last_beacon = drv_tx_last_beacon(local); |
632 | |
633 | #ifdef CONFIG_MAC80211_IBSS_DEBUG |
634 | printk(KERN_DEBUG "%s: RX ProbeReq SA=%pM DA=%pM BSSID=%pM" |
635 | " (tx_last_beacon=%d)\n", |
636 | sdata->name, mgmt->sa, mgmt->da, |
637 | mgmt->bssid, tx_last_beacon); |
638 | #endif /* CONFIG_MAC80211_IBSS_DEBUG */ |
639 | |
640 | if (!tx_last_beacon) |
641 | return; |
642 | |
643 | if (memcmp(mgmt->bssid, ifibss->bssid, ETH_ALEN) != 0 && |
644 | memcmp(mgmt->bssid, "\xff\xff\xff\xff\xff\xff", ETH_ALEN) != 0) |
645 | return; |
646 | |
647 | end = ((u8 *) mgmt) + len; |
648 | pos = mgmt->u.probe_req.variable; |
649 | if (pos[0] != WLAN_EID_SSID || |
650 | pos + 2 + pos[1] > end) { |
651 | #ifdef CONFIG_MAC80211_IBSS_DEBUG |
652 | printk(KERN_DEBUG "%s: Invalid SSID IE in ProbeReq " |
653 | "from %pM\n", |
654 | sdata->name, mgmt->sa); |
655 | #endif |
656 | return; |
657 | } |
658 | if (pos[1] != 0 && |
659 | (pos[1] != ifibss->ssid_len || |
660 | memcmp(pos + 2, ifibss->ssid, ifibss->ssid_len))) { |
661 | /* Ignore ProbeReq for foreign SSID */ |
662 | return; |
663 | } |
664 | |
665 | /* Reply with ProbeResp */ |
666 | skb = skb_copy(ifibss->presp, GFP_KERNEL); |
667 | if (!skb) |
668 | return; |
669 | |
670 | resp = (struct ieee80211_mgmt *) skb->data; |
671 | memcpy(resp->da, mgmt->sa, ETH_ALEN); |
672 | #ifdef CONFIG_MAC80211_IBSS_DEBUG |
673 | printk(KERN_DEBUG "%s: Sending ProbeResp to %pM\n", |
674 | sdata->name, resp->da); |
675 | #endif /* CONFIG_MAC80211_IBSS_DEBUG */ |
676 | IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT; |
677 | ieee80211_tx_skb(sdata, skb); |
678 | } |
679 | |
680 | static void ieee80211_rx_mgmt_probe_resp(struct ieee80211_sub_if_data *sdata, |
681 | struct ieee80211_mgmt *mgmt, |
682 | size_t len, |
683 | struct ieee80211_rx_status *rx_status) |
684 | { |
685 | size_t baselen; |
686 | struct ieee802_11_elems elems; |
687 | |
688 | if (memcmp(mgmt->da, sdata->vif.addr, ETH_ALEN)) |
689 | return; /* ignore ProbeResp to foreign address */ |
690 | |
691 | baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt; |
692 | if (baselen > len) |
693 | return; |
694 | |
695 | ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen, |
696 | &elems); |
697 | |
698 | ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems, false); |
699 | } |
700 | |
701 | static void ieee80211_rx_mgmt_beacon(struct ieee80211_sub_if_data *sdata, |
702 | struct ieee80211_mgmt *mgmt, |
703 | size_t len, |
704 | struct ieee80211_rx_status *rx_status) |
705 | { |
706 | size_t baselen; |
707 | struct ieee802_11_elems elems; |
708 | |
709 | /* Process beacon from the current BSS */ |
710 | baselen = (u8 *) mgmt->u.beacon.variable - (u8 *) mgmt; |
711 | if (baselen > len) |
712 | return; |
713 | |
714 | ieee802_11_parse_elems(mgmt->u.beacon.variable, len - baselen, &elems); |
715 | |
716 | ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems, true); |
717 | } |
718 | |
719 | static void ieee80211_ibss_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata, |
720 | struct sk_buff *skb) |
721 | { |
722 | struct ieee80211_rx_status *rx_status; |
723 | struct ieee80211_mgmt *mgmt; |
724 | u16 fc; |
725 | |
726 | rx_status = IEEE80211_SKB_RXCB(skb); |
727 | mgmt = (struct ieee80211_mgmt *) skb->data; |
728 | fc = le16_to_cpu(mgmt->frame_control); |
729 | |
730 | switch (fc & IEEE80211_FCTL_STYPE) { |
731 | case IEEE80211_STYPE_PROBE_REQ: |
732 | ieee80211_rx_mgmt_probe_req(sdata, mgmt, skb->len); |
733 | break; |
734 | case IEEE80211_STYPE_PROBE_RESP: |
735 | ieee80211_rx_mgmt_probe_resp(sdata, mgmt, skb->len, |
736 | rx_status); |
737 | break; |
738 | case IEEE80211_STYPE_BEACON: |
739 | ieee80211_rx_mgmt_beacon(sdata, mgmt, skb->len, |
740 | rx_status); |
741 | break; |
742 | case IEEE80211_STYPE_AUTH: |
743 | ieee80211_rx_mgmt_auth_ibss(sdata, mgmt, skb->len); |
744 | break; |
745 | } |
746 | |
747 | kfree_skb(skb); |
748 | } |
749 | |
750 | static void ieee80211_ibss_work(struct work_struct *work) |
751 | { |
752 | struct ieee80211_sub_if_data *sdata = |
753 | container_of(work, struct ieee80211_sub_if_data, u.ibss.work); |
754 | struct ieee80211_local *local = sdata->local; |
755 | struct ieee80211_if_ibss *ifibss; |
756 | struct sk_buff *skb; |
757 | |
758 | if (WARN_ON(local->suspended)) |
759 | return; |
760 | |
761 | if (!ieee80211_sdata_running(sdata)) |
762 | return; |
763 | |
764 | if (local->scanning) |
765 | return; |
766 | |
767 | if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_ADHOC)) |
768 | return; |
769 | ifibss = &sdata->u.ibss; |
770 | |
771 | while ((skb = skb_dequeue(&ifibss->skb_queue))) |
772 | ieee80211_ibss_rx_queued_mgmt(sdata, skb); |
773 | |
774 | if (!test_and_clear_bit(IEEE80211_IBSS_REQ_RUN, &ifibss->request)) |
775 | return; |
776 | |
777 | switch (ifibss->state) { |
778 | case IEEE80211_IBSS_MLME_SEARCH: |
779 | ieee80211_sta_find_ibss(sdata); |
780 | break; |
781 | case IEEE80211_IBSS_MLME_JOINED: |
782 | ieee80211_sta_merge_ibss(sdata); |
783 | break; |
784 | default: |
785 | WARN_ON(1); |
786 | break; |
787 | } |
788 | } |
789 | |
790 | static void ieee80211_ibss_timer(unsigned long data) |
791 | { |
792 | struct ieee80211_sub_if_data *sdata = |
793 | (struct ieee80211_sub_if_data *) data; |
794 | struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; |
795 | struct ieee80211_local *local = sdata->local; |
796 | |
797 | if (local->quiescing) { |
798 | ifibss->timer_running = true; |
799 | return; |
800 | } |
801 | |
802 | set_bit(IEEE80211_IBSS_REQ_RUN, &ifibss->request); |
803 | ieee80211_queue_work(&local->hw, &ifibss->work); |
804 | } |
805 | |
806 | #ifdef CONFIG_PM |
807 | void ieee80211_ibss_quiesce(struct ieee80211_sub_if_data *sdata) |
808 | { |
809 | struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; |
810 | |
811 | cancel_work_sync(&ifibss->work); |
812 | if (del_timer_sync(&ifibss->timer)) |
813 | ifibss->timer_running = true; |
814 | } |
815 | |
816 | void ieee80211_ibss_restart(struct ieee80211_sub_if_data *sdata) |
817 | { |
818 | struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; |
819 | |
820 | if (ifibss->timer_running) { |
821 | add_timer(&ifibss->timer); |
822 | ifibss->timer_running = false; |
823 | } |
824 | } |
825 | #endif |
826 | |
827 | void ieee80211_ibss_setup_sdata(struct ieee80211_sub_if_data *sdata) |
828 | { |
829 | struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; |
830 | |
831 | INIT_WORK(&ifibss->work, ieee80211_ibss_work); |
832 | setup_timer(&ifibss->timer, ieee80211_ibss_timer, |
833 | (unsigned long) sdata); |
834 | skb_queue_head_init(&ifibss->skb_queue); |
835 | } |
836 | |
837 | /* scan finished notification */ |
838 | void ieee80211_ibss_notify_scan_completed(struct ieee80211_local *local) |
839 | { |
840 | struct ieee80211_sub_if_data *sdata; |
841 | |
842 | mutex_lock(&local->iflist_mtx); |
843 | list_for_each_entry(sdata, &local->interfaces, list) { |
844 | if (!ieee80211_sdata_running(sdata)) |
845 | continue; |
846 | if (sdata->vif.type != NL80211_IFTYPE_ADHOC) |
847 | continue; |
848 | if (!sdata->u.ibss.ssid_len) |
849 | continue; |
850 | sdata->u.ibss.last_scan_completed = jiffies; |
851 | mod_timer(&sdata->u.ibss.timer, 0); |
852 | } |
853 | mutex_unlock(&local->iflist_mtx); |
854 | } |
855 | |
856 | ieee80211_rx_result |
857 | ieee80211_ibss_rx_mgmt(struct ieee80211_sub_if_data *sdata, struct sk_buff *skb) |
858 | { |
859 | struct ieee80211_local *local = sdata->local; |
860 | struct ieee80211_mgmt *mgmt; |
861 | u16 fc; |
862 | |
863 | if (skb->len < 24) |
864 | return RX_DROP_MONITOR; |
865 | |
866 | mgmt = (struct ieee80211_mgmt *) skb->data; |
867 | fc = le16_to_cpu(mgmt->frame_control); |
868 | |
869 | switch (fc & IEEE80211_FCTL_STYPE) { |
870 | case IEEE80211_STYPE_PROBE_RESP: |
871 | case IEEE80211_STYPE_BEACON: |
872 | case IEEE80211_STYPE_PROBE_REQ: |
873 | case IEEE80211_STYPE_AUTH: |
874 | skb_queue_tail(&sdata->u.ibss.skb_queue, skb); |
875 | ieee80211_queue_work(&local->hw, &sdata->u.ibss.work); |
876 | return RX_QUEUED; |
877 | } |
878 | |
879 | return RX_DROP_MONITOR; |
880 | } |
881 | |
882 | int ieee80211_ibss_join(struct ieee80211_sub_if_data *sdata, |
883 | struct cfg80211_ibss_params *params) |
884 | { |
885 | struct sk_buff *skb; |
886 | |
887 | if (params->bssid) { |
888 | memcpy(sdata->u.ibss.bssid, params->bssid, ETH_ALEN); |
889 | sdata->u.ibss.fixed_bssid = true; |
890 | } else |
891 | sdata->u.ibss.fixed_bssid = false; |
892 | |
893 | sdata->u.ibss.privacy = params->privacy; |
894 | |
895 | sdata->vif.bss_conf.beacon_int = params->beacon_interval; |
896 | |
897 | sdata->u.ibss.channel = params->channel; |
898 | sdata->u.ibss.fixed_channel = params->channel_fixed; |
899 | |
900 | if (params->ie) { |
901 | sdata->u.ibss.ie = kmemdup(params->ie, params->ie_len, |
902 | GFP_KERNEL); |
903 | if (sdata->u.ibss.ie) |
904 | sdata->u.ibss.ie_len = params->ie_len; |
905 | } |
906 | |
907 | skb = dev_alloc_skb(sdata->local->hw.extra_tx_headroom + |
908 | 36 /* bitrates */ + |
909 | 34 /* SSID */ + |
910 | 3 /* DS params */ + |
911 | 4 /* IBSS params */ + |
912 | params->ie_len); |
913 | if (!skb) |
914 | return -ENOMEM; |
915 | |
916 | sdata->u.ibss.skb = skb; |
917 | sdata->u.ibss.state = IEEE80211_IBSS_MLME_SEARCH; |
918 | sdata->u.ibss.ibss_join_req = jiffies; |
919 | |
920 | memcpy(sdata->u.ibss.ssid, params->ssid, IEEE80211_MAX_SSID_LEN); |
921 | |
922 | /* |
923 | * The ssid_len setting below is used to see whether |
924 | * we are active, and we need all other settings |
925 | * before that may get visible. |
926 | */ |
927 | mb(); |
928 | |
929 | sdata->u.ibss.ssid_len = params->ssid_len; |
930 | |
931 | ieee80211_recalc_idle(sdata->local); |
932 | |
933 | set_bit(IEEE80211_IBSS_REQ_RUN, &sdata->u.ibss.request); |
934 | ieee80211_queue_work(&sdata->local->hw, &sdata->u.ibss.work); |
935 | |
936 | return 0; |
937 | } |
938 | |
939 | int ieee80211_ibss_leave(struct ieee80211_sub_if_data *sdata) |
940 | { |
941 | struct sk_buff *skb; |
942 | |
943 | del_timer_sync(&sdata->u.ibss.timer); |
944 | clear_bit(IEEE80211_IBSS_REQ_RUN, &sdata->u.ibss.request); |
945 | cancel_work_sync(&sdata->u.ibss.work); |
946 | clear_bit(IEEE80211_IBSS_REQ_RUN, &sdata->u.ibss.request); |
947 | |
948 | sta_info_flush(sdata->local, sdata); |
949 | |
950 | /* remove beacon */ |
951 | kfree(sdata->u.ibss.ie); |
952 | skb = sdata->u.ibss.presp; |
953 | rcu_assign_pointer(sdata->u.ibss.presp, NULL); |
954 | ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BEACON_ENABLED); |
955 | synchronize_rcu(); |
956 | kfree_skb(skb); |
957 | |
958 | skb_queue_purge(&sdata->u.ibss.skb_queue); |
959 | memset(sdata->u.ibss.bssid, 0, ETH_ALEN); |
960 | sdata->u.ibss.ssid_len = 0; |
961 | |
962 | ieee80211_recalc_idle(sdata->local); |
963 | |
964 | return 0; |
965 | } |
966 |
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