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0a51b27e JB |
1 | /* |
2 | * BSS client mode implementation | |
3 | * Copyright 2003, Jouni Malinen <jkmaline@cc.hut.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 | * | |
9 | * This program is free software; you can redistribute it and/or modify | |
10 | * it under the terms of the GNU General Public License version 2 as | |
11 | * published by the Free Software Foundation. | |
12 | */ | |
13 | ||
14 | #include <linux/wireless.h> | |
15 | #include <linux/if_arp.h> | |
16 | #include <net/mac80211.h> | |
17 | #include <net/iw_handler.h> | |
18 | ||
19 | #include "ieee80211_i.h" | |
20 | ||
21 | #define IEEE80211_PROBE_DELAY (HZ / 33) | |
22 | #define IEEE80211_CHANNEL_TIME (HZ / 33) | |
23 | #define IEEE80211_PASSIVE_CHANNEL_TIME (HZ / 5) | |
24 | ||
25 | ||
26 | static void ieee80211_send_nullfunc(struct ieee80211_local *local, | |
27 | struct ieee80211_sub_if_data *sdata, | |
28 | int powersave) | |
29 | { | |
30 | struct sk_buff *skb; | |
31 | struct ieee80211_hdr *nullfunc; | |
32 | __le16 fc; | |
33 | ||
34 | skb = dev_alloc_skb(local->hw.extra_tx_headroom + 24); | |
35 | if (!skb) { | |
36 | printk(KERN_DEBUG "%s: failed to allocate buffer for nullfunc " | |
37 | "frame\n", sdata->dev->name); | |
38 | return; | |
39 | } | |
40 | skb_reserve(skb, local->hw.extra_tx_headroom); | |
41 | ||
42 | nullfunc = (struct ieee80211_hdr *) skb_put(skb, 24); | |
43 | memset(nullfunc, 0, 24); | |
44 | fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_NULLFUNC | | |
45 | IEEE80211_FCTL_TODS); | |
46 | if (powersave) | |
47 | fc |= cpu_to_le16(IEEE80211_FCTL_PM); | |
48 | nullfunc->frame_control = fc; | |
49 | memcpy(nullfunc->addr1, sdata->u.sta.bssid, ETH_ALEN); | |
50 | memcpy(nullfunc->addr2, sdata->dev->dev_addr, ETH_ALEN); | |
51 | memcpy(nullfunc->addr3, sdata->u.sta.bssid, ETH_ALEN); | |
52 | ||
53 | ieee80211_sta_tx(sdata, skb, 0); | |
54 | } | |
55 | ||
56 | static void ieee80211_restart_sta_timer(struct ieee80211_sub_if_data *sdata) | |
57 | { | |
58 | if (sdata->vif.type == IEEE80211_IF_TYPE_STA || | |
59 | ieee80211_vif_is_mesh(&sdata->vif)) | |
60 | ieee80211_sta_timer((unsigned long)sdata); | |
61 | } | |
62 | ||
63 | void ieee80211_scan_completed(struct ieee80211_hw *hw) | |
64 | { | |
65 | struct ieee80211_local *local = hw_to_local(hw); | |
66 | struct ieee80211_sub_if_data *sdata; | |
67 | union iwreq_data wrqu; | |
68 | ||
69 | local->last_scan_completed = jiffies; | |
70 | memset(&wrqu, 0, sizeof(wrqu)); | |
71 | wireless_send_event(local->scan_sdata->dev, SIOCGIWSCAN, &wrqu, NULL); | |
72 | ||
73 | if (local->sta_hw_scanning) { | |
74 | local->sta_hw_scanning = 0; | |
75 | if (ieee80211_hw_config(local)) | |
76 | printk(KERN_DEBUG "%s: failed to restore operational " | |
77 | "channel after scan\n", wiphy_name(local->hw.wiphy)); | |
78 | /* Restart STA timer for HW scan case */ | |
79 | rcu_read_lock(); | |
80 | list_for_each_entry_rcu(sdata, &local->interfaces, list) | |
81 | ieee80211_restart_sta_timer(sdata); | |
82 | rcu_read_unlock(); | |
83 | ||
84 | goto done; | |
85 | } | |
86 | ||
87 | local->sta_sw_scanning = 0; | |
88 | if (ieee80211_hw_config(local)) | |
89 | printk(KERN_DEBUG "%s: failed to restore operational " | |
90 | "channel after scan\n", wiphy_name(local->hw.wiphy)); | |
91 | ||
92 | ||
93 | netif_tx_lock_bh(local->mdev); | |
94 | netif_addr_lock(local->mdev); | |
95 | local->filter_flags &= ~FIF_BCN_PRBRESP_PROMISC; | |
96 | local->ops->configure_filter(local_to_hw(local), | |
97 | FIF_BCN_PRBRESP_PROMISC, | |
98 | &local->filter_flags, | |
99 | local->mdev->mc_count, | |
100 | local->mdev->mc_list); | |
101 | ||
102 | netif_addr_unlock(local->mdev); | |
103 | netif_tx_unlock_bh(local->mdev); | |
104 | ||
105 | rcu_read_lock(); | |
106 | list_for_each_entry_rcu(sdata, &local->interfaces, list) { | |
107 | /* Tell AP we're back */ | |
108 | if (sdata->vif.type == IEEE80211_IF_TYPE_STA) { | |
109 | if (sdata->u.sta.flags & IEEE80211_STA_ASSOCIATED) { | |
110 | ieee80211_send_nullfunc(local, sdata, 0); | |
111 | netif_tx_wake_all_queues(sdata->dev); | |
112 | } | |
113 | } else | |
114 | netif_tx_wake_all_queues(sdata->dev); | |
115 | ||
116 | ieee80211_restart_sta_timer(sdata); | |
117 | } | |
118 | rcu_read_unlock(); | |
119 | ||
120 | done: | |
121 | ieee80211_mlme_notify_scan_completed(local); | |
122 | } | |
123 | EXPORT_SYMBOL(ieee80211_scan_completed); | |
124 | ||
125 | ||
126 | void ieee80211_sta_scan_work(struct work_struct *work) | |
127 | { | |
128 | struct ieee80211_local *local = | |
129 | container_of(work, struct ieee80211_local, scan_work.work); | |
130 | struct ieee80211_sub_if_data *sdata = local->scan_sdata; | |
131 | struct ieee80211_supported_band *sband; | |
132 | struct ieee80211_channel *chan; | |
133 | int skip; | |
134 | unsigned long next_delay = 0; | |
135 | ||
136 | if (!local->sta_sw_scanning) | |
137 | return; | |
138 | ||
139 | switch (local->scan_state) { | |
140 | case SCAN_SET_CHANNEL: | |
141 | /* | |
142 | * Get current scan band. scan_band may be IEEE80211_NUM_BANDS | |
143 | * after we successfully scanned the last channel of the last | |
144 | * band (and the last band is supported by the hw) | |
145 | */ | |
146 | if (local->scan_band < IEEE80211_NUM_BANDS) | |
147 | sband = local->hw.wiphy->bands[local->scan_band]; | |
148 | else | |
149 | sband = NULL; | |
150 | ||
151 | /* | |
152 | * If we are at an unsupported band and have more bands | |
153 | * left to scan, advance to the next supported one. | |
154 | */ | |
155 | while (!sband && local->scan_band < IEEE80211_NUM_BANDS - 1) { | |
156 | local->scan_band++; | |
157 | sband = local->hw.wiphy->bands[local->scan_band]; | |
158 | local->scan_channel_idx = 0; | |
159 | } | |
160 | ||
161 | /* if no more bands/channels left, complete scan */ | |
162 | if (!sband || local->scan_channel_idx >= sband->n_channels) { | |
163 | ieee80211_scan_completed(local_to_hw(local)); | |
164 | return; | |
165 | } | |
166 | skip = 0; | |
167 | chan = &sband->channels[local->scan_channel_idx]; | |
168 | ||
169 | if (chan->flags & IEEE80211_CHAN_DISABLED || | |
170 | (sdata->vif.type == IEEE80211_IF_TYPE_IBSS && | |
171 | chan->flags & IEEE80211_CHAN_NO_IBSS)) | |
172 | skip = 1; | |
173 | ||
174 | if (!skip) { | |
175 | local->scan_channel = chan; | |
176 | if (ieee80211_hw_config(local)) { | |
177 | printk(KERN_DEBUG "%s: failed to set freq to " | |
178 | "%d MHz for scan\n", wiphy_name(local->hw.wiphy), | |
179 | chan->center_freq); | |
180 | skip = 1; | |
181 | } | |
182 | } | |
183 | ||
184 | /* advance state machine to next channel/band */ | |
185 | local->scan_channel_idx++; | |
186 | if (local->scan_channel_idx >= sband->n_channels) { | |
187 | /* | |
188 | * scan_band may end up == IEEE80211_NUM_BANDS, but | |
189 | * we'll catch that case above and complete the scan | |
190 | * if that is the case. | |
191 | */ | |
192 | local->scan_band++; | |
193 | local->scan_channel_idx = 0; | |
194 | } | |
195 | ||
196 | if (skip) | |
197 | break; | |
198 | ||
199 | next_delay = IEEE80211_PROBE_DELAY + | |
200 | usecs_to_jiffies(local->hw.channel_change_time); | |
201 | local->scan_state = SCAN_SEND_PROBE; | |
202 | break; | |
203 | case SCAN_SEND_PROBE: | |
204 | next_delay = IEEE80211_PASSIVE_CHANNEL_TIME; | |
205 | local->scan_state = SCAN_SET_CHANNEL; | |
206 | ||
207 | if (local->scan_channel->flags & IEEE80211_CHAN_PASSIVE_SCAN) | |
208 | break; | |
209 | ieee80211_send_probe_req(sdata, NULL, local->scan_ssid, | |
210 | local->scan_ssid_len); | |
211 | next_delay = IEEE80211_CHANNEL_TIME; | |
212 | break; | |
213 | } | |
214 | ||
215 | if (local->sta_sw_scanning) | |
216 | queue_delayed_work(local->hw.workqueue, &local->scan_work, | |
217 | next_delay); | |
218 | } | |
219 | ||
220 | ||
221 | int ieee80211_sta_start_scan(struct ieee80211_sub_if_data *scan_sdata, | |
222 | u8 *ssid, size_t ssid_len) | |
223 | { | |
224 | struct ieee80211_local *local = scan_sdata->local; | |
225 | struct ieee80211_sub_if_data *sdata; | |
226 | ||
227 | if (ssid_len > IEEE80211_MAX_SSID_LEN) | |
228 | return -EINVAL; | |
229 | ||
230 | /* MLME-SCAN.request (page 118) page 144 (11.1.3.1) | |
231 | * BSSType: INFRASTRUCTURE, INDEPENDENT, ANY_BSS | |
232 | * BSSID: MACAddress | |
233 | * SSID | |
234 | * ScanType: ACTIVE, PASSIVE | |
235 | * ProbeDelay: delay (in microseconds) to be used prior to transmitting | |
236 | * a Probe frame during active scanning | |
237 | * ChannelList | |
238 | * MinChannelTime (>= ProbeDelay), in TU | |
239 | * MaxChannelTime: (>= MinChannelTime), in TU | |
240 | */ | |
241 | ||
242 | /* MLME-SCAN.confirm | |
243 | * BSSDescriptionSet | |
244 | * ResultCode: SUCCESS, INVALID_PARAMETERS | |
245 | */ | |
246 | ||
247 | if (local->sta_sw_scanning || local->sta_hw_scanning) { | |
248 | if (local->scan_sdata == scan_sdata) | |
249 | return 0; | |
250 | return -EBUSY; | |
251 | } | |
252 | ||
253 | if (local->ops->hw_scan) { | |
254 | int rc = local->ops->hw_scan(local_to_hw(local), | |
255 | ssid, ssid_len); | |
256 | if (!rc) { | |
257 | local->sta_hw_scanning = 1; | |
258 | local->scan_sdata = scan_sdata; | |
259 | } | |
260 | return rc; | |
261 | } | |
262 | ||
263 | local->sta_sw_scanning = 1; | |
264 | ||
265 | rcu_read_lock(); | |
266 | list_for_each_entry_rcu(sdata, &local->interfaces, list) { | |
267 | if (sdata->vif.type == IEEE80211_IF_TYPE_STA) { | |
268 | if (sdata->u.sta.flags & IEEE80211_STA_ASSOCIATED) { | |
269 | netif_tx_stop_all_queues(sdata->dev); | |
270 | ieee80211_send_nullfunc(local, sdata, 1); | |
271 | } | |
272 | } else | |
273 | netif_tx_stop_all_queues(sdata->dev); | |
274 | } | |
275 | rcu_read_unlock(); | |
276 | ||
277 | if (ssid) { | |
278 | local->scan_ssid_len = ssid_len; | |
279 | memcpy(local->scan_ssid, ssid, ssid_len); | |
280 | } else | |
281 | local->scan_ssid_len = 0; | |
282 | local->scan_state = SCAN_SET_CHANNEL; | |
283 | local->scan_channel_idx = 0; | |
284 | local->scan_band = IEEE80211_BAND_2GHZ; | |
285 | local->scan_sdata = scan_sdata; | |
286 | ||
287 | netif_addr_lock_bh(local->mdev); | |
288 | local->filter_flags |= FIF_BCN_PRBRESP_PROMISC; | |
289 | local->ops->configure_filter(local_to_hw(local), | |
290 | FIF_BCN_PRBRESP_PROMISC, | |
291 | &local->filter_flags, | |
292 | local->mdev->mc_count, | |
293 | local->mdev->mc_list); | |
294 | netif_addr_unlock_bh(local->mdev); | |
295 | ||
296 | /* TODO: start scan as soon as all nullfunc frames are ACKed */ | |
297 | queue_delayed_work(local->hw.workqueue, &local->scan_work, | |
298 | IEEE80211_CHANNEL_TIME); | |
299 | ||
300 | return 0; | |
301 | } | |
302 | ||
303 | ||
304 | int ieee80211_sta_req_scan(struct ieee80211_sub_if_data *sdata, u8 *ssid, size_t ssid_len) | |
305 | { | |
306 | struct ieee80211_if_sta *ifsta = &sdata->u.sta; | |
307 | struct ieee80211_local *local = sdata->local; | |
308 | ||
309 | if (sdata->vif.type != IEEE80211_IF_TYPE_STA) | |
310 | return ieee80211_sta_start_scan(sdata, ssid, ssid_len); | |
311 | ||
312 | if (local->sta_sw_scanning || local->sta_hw_scanning) { | |
313 | if (local->scan_sdata == sdata) | |
314 | return 0; | |
315 | return -EBUSY; | |
316 | } | |
317 | ||
318 | ifsta->scan_ssid_len = ssid_len; | |
319 | if (ssid_len) | |
320 | memcpy(ifsta->scan_ssid, ssid, ssid_len); | |
321 | set_bit(IEEE80211_STA_REQ_SCAN, &ifsta->request); | |
322 | queue_work(local->hw.workqueue, &ifsta->work); | |
323 | return 0; | |
324 | } | |
325 | ||
326 | ||
327 | static void ieee80211_sta_add_scan_ies(struct iw_request_info *info, | |
328 | struct ieee80211_sta_bss *bss, | |
329 | char **current_ev, char *end_buf) | |
330 | { | |
331 | u8 *pos, *end, *next; | |
332 | struct iw_event iwe; | |
333 | ||
334 | if (bss == NULL || bss->ies == NULL) | |
335 | return; | |
336 | ||
337 | /* | |
338 | * If needed, fragment the IEs buffer (at IE boundaries) into short | |
339 | * enough fragments to fit into IW_GENERIC_IE_MAX octet messages. | |
340 | */ | |
341 | pos = bss->ies; | |
342 | end = pos + bss->ies_len; | |
343 | ||
344 | while (end - pos > IW_GENERIC_IE_MAX) { | |
345 | next = pos + 2 + pos[1]; | |
346 | while (next + 2 + next[1] - pos < IW_GENERIC_IE_MAX) | |
347 | next = next + 2 + next[1]; | |
348 | ||
349 | memset(&iwe, 0, sizeof(iwe)); | |
350 | iwe.cmd = IWEVGENIE; | |
351 | iwe.u.data.length = next - pos; | |
352 | *current_ev = iwe_stream_add_point(info, *current_ev, | |
353 | end_buf, &iwe, pos); | |
354 | ||
355 | pos = next; | |
356 | } | |
357 | ||
358 | if (end > pos) { | |
359 | memset(&iwe, 0, sizeof(iwe)); | |
360 | iwe.cmd = IWEVGENIE; | |
361 | iwe.u.data.length = end - pos; | |
362 | *current_ev = iwe_stream_add_point(info, *current_ev, | |
363 | end_buf, &iwe, pos); | |
364 | } | |
365 | } | |
366 | ||
367 | ||
368 | static char * | |
369 | ieee80211_sta_scan_result(struct ieee80211_local *local, | |
370 | struct iw_request_info *info, | |
371 | struct ieee80211_sta_bss *bss, | |
372 | char *current_ev, char *end_buf) | |
373 | { | |
374 | struct iw_event iwe; | |
375 | char *buf; | |
376 | ||
377 | if (time_after(jiffies, | |
378 | bss->last_update + IEEE80211_SCAN_RESULT_EXPIRE)) | |
379 | return current_ev; | |
380 | ||
381 | memset(&iwe, 0, sizeof(iwe)); | |
382 | iwe.cmd = SIOCGIWAP; | |
383 | iwe.u.ap_addr.sa_family = ARPHRD_ETHER; | |
384 | memcpy(iwe.u.ap_addr.sa_data, bss->bssid, ETH_ALEN); | |
385 | current_ev = iwe_stream_add_event(info, current_ev, end_buf, &iwe, | |
386 | IW_EV_ADDR_LEN); | |
387 | ||
388 | memset(&iwe, 0, sizeof(iwe)); | |
389 | iwe.cmd = SIOCGIWESSID; | |
390 | if (bss_mesh_cfg(bss)) { | |
391 | iwe.u.data.length = bss_mesh_id_len(bss); | |
392 | iwe.u.data.flags = 1; | |
393 | current_ev = iwe_stream_add_point(info, current_ev, end_buf, | |
394 | &iwe, bss_mesh_id(bss)); | |
395 | } else { | |
396 | iwe.u.data.length = bss->ssid_len; | |
397 | iwe.u.data.flags = 1; | |
398 | current_ev = iwe_stream_add_point(info, current_ev, end_buf, | |
399 | &iwe, bss->ssid); | |
400 | } | |
401 | ||
402 | if (bss->capability & (WLAN_CAPABILITY_ESS | WLAN_CAPABILITY_IBSS) | |
403 | || bss_mesh_cfg(bss)) { | |
404 | memset(&iwe, 0, sizeof(iwe)); | |
405 | iwe.cmd = SIOCGIWMODE; | |
406 | if (bss_mesh_cfg(bss)) | |
407 | iwe.u.mode = IW_MODE_MESH; | |
408 | else if (bss->capability & WLAN_CAPABILITY_ESS) | |
409 | iwe.u.mode = IW_MODE_MASTER; | |
410 | else | |
411 | iwe.u.mode = IW_MODE_ADHOC; | |
412 | current_ev = iwe_stream_add_event(info, current_ev, end_buf, | |
413 | &iwe, IW_EV_UINT_LEN); | |
414 | } | |
415 | ||
416 | memset(&iwe, 0, sizeof(iwe)); | |
417 | iwe.cmd = SIOCGIWFREQ; | |
418 | iwe.u.freq.m = ieee80211_frequency_to_channel(bss->freq); | |
419 | iwe.u.freq.e = 0; | |
420 | current_ev = iwe_stream_add_event(info, current_ev, end_buf, &iwe, | |
421 | IW_EV_FREQ_LEN); | |
422 | ||
423 | memset(&iwe, 0, sizeof(iwe)); | |
424 | iwe.cmd = SIOCGIWFREQ; | |
425 | iwe.u.freq.m = bss->freq; | |
426 | iwe.u.freq.e = 6; | |
427 | current_ev = iwe_stream_add_event(info, current_ev, end_buf, &iwe, | |
428 | IW_EV_FREQ_LEN); | |
429 | memset(&iwe, 0, sizeof(iwe)); | |
430 | iwe.cmd = IWEVQUAL; | |
431 | iwe.u.qual.qual = bss->qual; | |
432 | iwe.u.qual.level = bss->signal; | |
433 | iwe.u.qual.noise = bss->noise; | |
434 | iwe.u.qual.updated = local->wstats_flags; | |
435 | current_ev = iwe_stream_add_event(info, current_ev, end_buf, &iwe, | |
436 | IW_EV_QUAL_LEN); | |
437 | ||
438 | memset(&iwe, 0, sizeof(iwe)); | |
439 | iwe.cmd = SIOCGIWENCODE; | |
440 | if (bss->capability & WLAN_CAPABILITY_PRIVACY) | |
441 | iwe.u.data.flags = IW_ENCODE_ENABLED | IW_ENCODE_NOKEY; | |
442 | else | |
443 | iwe.u.data.flags = IW_ENCODE_DISABLED; | |
444 | iwe.u.data.length = 0; | |
445 | current_ev = iwe_stream_add_point(info, current_ev, end_buf, | |
446 | &iwe, ""); | |
447 | ||
448 | ieee80211_sta_add_scan_ies(info, bss, ¤t_ev, end_buf); | |
449 | ||
450 | if (bss->supp_rates_len > 0) { | |
451 | /* display all supported rates in readable format */ | |
452 | char *p = current_ev + iwe_stream_lcp_len(info); | |
453 | int i; | |
454 | ||
455 | memset(&iwe, 0, sizeof(iwe)); | |
456 | iwe.cmd = SIOCGIWRATE; | |
457 | /* Those two flags are ignored... */ | |
458 | iwe.u.bitrate.fixed = iwe.u.bitrate.disabled = 0; | |
459 | ||
460 | for (i = 0; i < bss->supp_rates_len; i++) { | |
461 | iwe.u.bitrate.value = ((bss->supp_rates[i] & | |
462 | 0x7f) * 500000); | |
463 | p = iwe_stream_add_value(info, current_ev, p, | |
464 | end_buf, &iwe, IW_EV_PARAM_LEN); | |
465 | } | |
466 | current_ev = p; | |
467 | } | |
468 | ||
469 | buf = kmalloc(30, GFP_ATOMIC); | |
470 | if (buf) { | |
471 | memset(&iwe, 0, sizeof(iwe)); | |
472 | iwe.cmd = IWEVCUSTOM; | |
473 | sprintf(buf, "tsf=%016llx", (unsigned long long)(bss->timestamp)); | |
474 | iwe.u.data.length = strlen(buf); | |
475 | current_ev = iwe_stream_add_point(info, current_ev, end_buf, | |
476 | &iwe, buf); | |
477 | memset(&iwe, 0, sizeof(iwe)); | |
478 | iwe.cmd = IWEVCUSTOM; | |
479 | sprintf(buf, " Last beacon: %dms ago", | |
480 | jiffies_to_msecs(jiffies - bss->last_update)); | |
481 | iwe.u.data.length = strlen(buf); | |
482 | current_ev = iwe_stream_add_point(info, current_ev, | |
483 | end_buf, &iwe, buf); | |
484 | kfree(buf); | |
485 | } | |
486 | ||
487 | if (bss_mesh_cfg(bss)) { | |
488 | u8 *cfg = bss_mesh_cfg(bss); | |
489 | buf = kmalloc(50, GFP_ATOMIC); | |
490 | if (buf) { | |
491 | memset(&iwe, 0, sizeof(iwe)); | |
492 | iwe.cmd = IWEVCUSTOM; | |
493 | sprintf(buf, "Mesh network (version %d)", cfg[0]); | |
494 | iwe.u.data.length = strlen(buf); | |
495 | current_ev = iwe_stream_add_point(info, current_ev, | |
496 | end_buf, | |
497 | &iwe, buf); | |
498 | sprintf(buf, "Path Selection Protocol ID: " | |
499 | "0x%02X%02X%02X%02X", cfg[1], cfg[2], cfg[3], | |
500 | cfg[4]); | |
501 | iwe.u.data.length = strlen(buf); | |
502 | current_ev = iwe_stream_add_point(info, current_ev, | |
503 | end_buf, | |
504 | &iwe, buf); | |
505 | sprintf(buf, "Path Selection Metric ID: " | |
506 | "0x%02X%02X%02X%02X", cfg[5], cfg[6], cfg[7], | |
507 | cfg[8]); | |
508 | iwe.u.data.length = strlen(buf); | |
509 | current_ev = iwe_stream_add_point(info, current_ev, | |
510 | end_buf, | |
511 | &iwe, buf); | |
512 | sprintf(buf, "Congestion Control Mode ID: " | |
513 | "0x%02X%02X%02X%02X", cfg[9], cfg[10], | |
514 | cfg[11], cfg[12]); | |
515 | iwe.u.data.length = strlen(buf); | |
516 | current_ev = iwe_stream_add_point(info, current_ev, | |
517 | end_buf, | |
518 | &iwe, buf); | |
519 | sprintf(buf, "Channel Precedence: " | |
520 | "0x%02X%02X%02X%02X", cfg[13], cfg[14], | |
521 | cfg[15], cfg[16]); | |
522 | iwe.u.data.length = strlen(buf); | |
523 | current_ev = iwe_stream_add_point(info, current_ev, | |
524 | end_buf, | |
525 | &iwe, buf); | |
526 | kfree(buf); | |
527 | } | |
528 | } | |
529 | ||
530 | return current_ev; | |
531 | } | |
532 | ||
533 | ||
534 | int ieee80211_sta_scan_results(struct ieee80211_local *local, | |
535 | struct iw_request_info *info, | |
536 | char *buf, size_t len) | |
537 | { | |
538 | char *current_ev = buf; | |
539 | char *end_buf = buf + len; | |
540 | struct ieee80211_sta_bss *bss; | |
541 | ||
542 | spin_lock_bh(&local->sta_bss_lock); | |
543 | list_for_each_entry(bss, &local->sta_bss_list, list) { | |
544 | if (buf + len - current_ev <= IW_EV_ADDR_LEN) { | |
545 | spin_unlock_bh(&local->sta_bss_lock); | |
546 | return -E2BIG; | |
547 | } | |
548 | current_ev = ieee80211_sta_scan_result(local, info, bss, | |
549 | current_ev, end_buf); | |
550 | } | |
551 | spin_unlock_bh(&local->sta_bss_lock); | |
552 | return current_ev - buf; | |
553 | } |