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Commit | Line | Data |
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2a519311 JB |
1 | /* |
2 | * cfg80211 scan result handling | |
3 | * | |
4 | * Copyright 2008 Johannes Berg <johannes@sipsolutions.net> | |
5 | */ | |
6 | #include <linux/kernel.h> | |
7 | #include <linux/module.h> | |
8 | #include <linux/netdevice.h> | |
9 | #include <linux/wireless.h> | |
10 | #include <linux/nl80211.h> | |
11 | #include <linux/etherdevice.h> | |
12 | #include <net/arp.h> | |
13 | #include <net/cfg80211.h> | |
14 | #include <net/iw_handler.h> | |
15 | #include "core.h" | |
16 | #include "nl80211.h" | |
17 | ||
18 | #define IEEE80211_SCAN_RESULT_EXPIRE (10 * HZ) | |
19 | ||
20 | void cfg80211_scan_done(struct cfg80211_scan_request *request, bool aborted) | |
21 | { | |
22 | struct net_device *dev; | |
23 | #ifdef CONFIG_WIRELESS_EXT | |
24 | union iwreq_data wrqu; | |
25 | #endif | |
26 | ||
27 | dev = dev_get_by_index(&init_net, request->ifidx); | |
28 | if (!dev) | |
29 | goto out; | |
30 | ||
31 | WARN_ON(request != wiphy_to_dev(request->wiphy)->scan_req); | |
32 | wiphy_to_dev(request->wiphy)->scan_req = NULL; | |
33 | ||
34 | if (aborted) | |
35 | nl80211_send_scan_aborted(wiphy_to_dev(request->wiphy), dev); | |
36 | else | |
37 | nl80211_send_scan_done(wiphy_to_dev(request->wiphy), dev); | |
38 | ||
39 | #ifdef CONFIG_WIRELESS_EXT | |
40 | if (!aborted) { | |
41 | memset(&wrqu, 0, sizeof(wrqu)); | |
42 | ||
43 | wireless_send_event(dev, SIOCGIWSCAN, &wrqu, NULL); | |
44 | } | |
45 | #endif | |
46 | ||
47 | dev_put(dev); | |
48 | ||
49 | out: | |
50 | kfree(request); | |
51 | } | |
52 | EXPORT_SYMBOL(cfg80211_scan_done); | |
53 | ||
54 | static void bss_release(struct kref *ref) | |
55 | { | |
56 | struct cfg80211_internal_bss *bss; | |
57 | ||
58 | bss = container_of(ref, struct cfg80211_internal_bss, ref); | |
59 | kfree(bss); | |
60 | } | |
61 | ||
62 | /* must hold dev->bss_lock! */ | |
63 | void cfg80211_bss_expire(struct cfg80211_registered_device *dev) | |
64 | { | |
65 | struct cfg80211_internal_bss *bss, *tmp; | |
66 | bool expired = false; | |
67 | ||
68 | list_for_each_entry_safe(bss, tmp, &dev->bss_list, list) { | |
69 | if (!time_after(jiffies, bss->ts + IEEE80211_SCAN_RESULT_EXPIRE)) | |
70 | continue; | |
71 | list_del(&bss->list); | |
72 | rb_erase(&bss->rbn, &dev->bss_tree); | |
73 | kref_put(&bss->ref, bss_release); | |
74 | expired = true; | |
75 | } | |
76 | ||
77 | if (expired) | |
78 | dev->bss_generation++; | |
79 | } | |
80 | ||
81 | static u8 *find_ie(u8 num, u8 *ies, size_t len) | |
82 | { | |
83 | while (len > 2 && ies[0] != num) { | |
84 | len -= ies[1] + 2; | |
85 | ies += ies[1] + 2; | |
86 | } | |
87 | if (len < 2) | |
88 | return NULL; | |
89 | if (len < 2 + ies[1]) | |
90 | return NULL; | |
91 | return ies; | |
92 | } | |
93 | ||
94 | static int cmp_ies(u8 num, u8 *ies1, size_t len1, u8 *ies2, size_t len2) | |
95 | { | |
96 | const u8 *ie1 = find_ie(num, ies1, len1); | |
97 | const u8 *ie2 = find_ie(num, ies2, len2); | |
98 | int r; | |
99 | ||
100 | if (!ie1 && !ie2) | |
101 | return 0; | |
102 | if (!ie1) | |
103 | return -1; | |
104 | ||
105 | r = memcmp(ie1 + 2, ie2 + 2, min(ie1[1], ie2[1])); | |
106 | if (r == 0 && ie1[1] != ie2[1]) | |
107 | return ie2[1] - ie1[1]; | |
108 | return r; | |
109 | } | |
110 | ||
111 | static bool is_bss(struct cfg80211_bss *a, | |
112 | const u8 *bssid, | |
113 | const u8 *ssid, size_t ssid_len) | |
114 | { | |
115 | const u8 *ssidie; | |
116 | ||
117 | if (compare_ether_addr(a->bssid, bssid)) | |
118 | return false; | |
119 | ||
120 | ssidie = find_ie(WLAN_EID_SSID, | |
121 | a->information_elements, | |
122 | a->len_information_elements); | |
123 | if (!ssidie) | |
124 | return false; | |
125 | if (ssidie[1] != ssid_len) | |
126 | return false; | |
127 | return memcmp(ssidie + 2, ssid, ssid_len) == 0; | |
128 | } | |
129 | ||
130 | static bool is_mesh(struct cfg80211_bss *a, | |
131 | const u8 *meshid, size_t meshidlen, | |
132 | const u8 *meshcfg) | |
133 | { | |
134 | const u8 *ie; | |
135 | ||
136 | if (!is_zero_ether_addr(a->bssid)) | |
137 | return false; | |
138 | ||
139 | ie = find_ie(WLAN_EID_MESH_ID, | |
140 | a->information_elements, | |
141 | a->len_information_elements); | |
142 | if (!ie) | |
143 | return false; | |
144 | if (ie[1] != meshidlen) | |
145 | return false; | |
146 | if (memcmp(ie + 2, meshid, meshidlen)) | |
147 | return false; | |
148 | ||
149 | ie = find_ie(WLAN_EID_MESH_CONFIG, | |
150 | a->information_elements, | |
151 | a->len_information_elements); | |
152 | if (ie[1] != IEEE80211_MESH_CONFIG_LEN) | |
153 | return false; | |
154 | ||
155 | /* | |
156 | * Ignore mesh capability (last two bytes of the IE) when | |
157 | * comparing since that may differ between stations taking | |
158 | * part in the same mesh. | |
159 | */ | |
160 | return memcmp(ie + 2, meshcfg, IEEE80211_MESH_CONFIG_LEN - 2) == 0; | |
161 | } | |
162 | ||
163 | static int cmp_bss(struct cfg80211_bss *a, | |
164 | struct cfg80211_bss *b) | |
165 | { | |
166 | int r; | |
167 | ||
168 | if (a->channel != b->channel) | |
169 | return b->channel->center_freq - a->channel->center_freq; | |
170 | ||
171 | r = memcmp(a->bssid, b->bssid, ETH_ALEN); | |
172 | if (r) | |
173 | return r; | |
174 | ||
175 | if (is_zero_ether_addr(a->bssid)) { | |
176 | r = cmp_ies(WLAN_EID_MESH_ID, | |
177 | a->information_elements, | |
178 | a->len_information_elements, | |
179 | b->information_elements, | |
180 | b->len_information_elements); | |
181 | if (r) | |
182 | return r; | |
183 | return cmp_ies(WLAN_EID_MESH_CONFIG, | |
184 | a->information_elements, | |
185 | a->len_information_elements, | |
186 | b->information_elements, | |
187 | b->len_information_elements); | |
188 | } | |
189 | ||
190 | return cmp_ies(WLAN_EID_SSID, | |
191 | a->information_elements, | |
192 | a->len_information_elements, | |
193 | b->information_elements, | |
194 | b->len_information_elements); | |
195 | } | |
196 | ||
197 | struct cfg80211_bss *cfg80211_get_bss(struct wiphy *wiphy, | |
198 | struct ieee80211_channel *channel, | |
199 | const u8 *bssid, | |
200 | const u8 *ssid, size_t ssid_len) | |
201 | { | |
202 | struct cfg80211_registered_device *dev = wiphy_to_dev(wiphy); | |
203 | struct cfg80211_internal_bss *bss, *res = NULL; | |
204 | ||
205 | spin_lock_bh(&dev->bss_lock); | |
206 | ||
207 | list_for_each_entry(bss, &dev->bss_list, list) { | |
208 | if (channel && bss->pub.channel != channel) | |
209 | continue; | |
210 | if (is_bss(&bss->pub, bssid, ssid, ssid_len)) { | |
211 | res = bss; | |
212 | kref_get(&res->ref); | |
213 | break; | |
214 | } | |
215 | } | |
216 | ||
217 | spin_unlock_bh(&dev->bss_lock); | |
218 | if (!res) | |
219 | return NULL; | |
220 | return &res->pub; | |
221 | } | |
222 | EXPORT_SYMBOL(cfg80211_get_bss); | |
223 | ||
224 | struct cfg80211_bss *cfg80211_get_mesh(struct wiphy *wiphy, | |
225 | struct ieee80211_channel *channel, | |
226 | const u8 *meshid, size_t meshidlen, | |
227 | const u8 *meshcfg) | |
228 | { | |
229 | struct cfg80211_registered_device *dev = wiphy_to_dev(wiphy); | |
230 | struct cfg80211_internal_bss *bss, *res = NULL; | |
231 | ||
232 | spin_lock_bh(&dev->bss_lock); | |
233 | ||
234 | list_for_each_entry(bss, &dev->bss_list, list) { | |
235 | if (channel && bss->pub.channel != channel) | |
236 | continue; | |
237 | if (is_mesh(&bss->pub, meshid, meshidlen, meshcfg)) { | |
238 | res = bss; | |
239 | kref_get(&res->ref); | |
240 | break; | |
241 | } | |
242 | } | |
243 | ||
244 | spin_unlock_bh(&dev->bss_lock); | |
245 | if (!res) | |
246 | return NULL; | |
247 | return &res->pub; | |
248 | } | |
249 | EXPORT_SYMBOL(cfg80211_get_mesh); | |
250 | ||
251 | ||
252 | static void rb_insert_bss(struct cfg80211_registered_device *dev, | |
253 | struct cfg80211_internal_bss *bss) | |
254 | { | |
255 | struct rb_node **p = &dev->bss_tree.rb_node; | |
256 | struct rb_node *parent = NULL; | |
257 | struct cfg80211_internal_bss *tbss; | |
258 | int cmp; | |
259 | ||
260 | while (*p) { | |
261 | parent = *p; | |
262 | tbss = rb_entry(parent, struct cfg80211_internal_bss, rbn); | |
263 | ||
264 | cmp = cmp_bss(&bss->pub, &tbss->pub); | |
265 | ||
266 | if (WARN_ON(!cmp)) { | |
267 | /* will sort of leak this BSS */ | |
268 | return; | |
269 | } | |
270 | ||
271 | if (cmp < 0) | |
272 | p = &(*p)->rb_left; | |
273 | else | |
274 | p = &(*p)->rb_right; | |
275 | } | |
276 | ||
277 | rb_link_node(&bss->rbn, parent, p); | |
278 | rb_insert_color(&bss->rbn, &dev->bss_tree); | |
279 | } | |
280 | ||
281 | static struct cfg80211_internal_bss * | |
282 | rb_find_bss(struct cfg80211_registered_device *dev, | |
283 | struct cfg80211_internal_bss *res) | |
284 | { | |
285 | struct rb_node *n = dev->bss_tree.rb_node; | |
286 | struct cfg80211_internal_bss *bss; | |
287 | int r; | |
288 | ||
289 | while (n) { | |
290 | bss = rb_entry(n, struct cfg80211_internal_bss, rbn); | |
291 | r = cmp_bss(&res->pub, &bss->pub); | |
292 | ||
293 | if (r == 0) | |
294 | return bss; | |
295 | else if (r < 0) | |
296 | n = n->rb_left; | |
297 | else | |
298 | n = n->rb_right; | |
299 | } | |
300 | ||
301 | return NULL; | |
302 | } | |
303 | ||
304 | static struct cfg80211_internal_bss * | |
305 | cfg80211_bss_update(struct cfg80211_registered_device *dev, | |
306 | struct cfg80211_internal_bss *res, | |
307 | bool overwrite) | |
308 | { | |
309 | struct cfg80211_internal_bss *found = NULL; | |
310 | const u8 *meshid, *meshcfg; | |
311 | ||
312 | /* | |
313 | * The reference to "res" is donated to this function. | |
314 | */ | |
315 | ||
316 | if (WARN_ON(!res->pub.channel)) { | |
317 | kref_put(&res->ref, bss_release); | |
318 | return NULL; | |
319 | } | |
320 | ||
321 | res->ts = jiffies; | |
322 | ||
323 | if (is_zero_ether_addr(res->pub.bssid)) { | |
324 | /* must be mesh, verify */ | |
325 | meshid = find_ie(WLAN_EID_MESH_ID, res->pub.information_elements, | |
326 | res->pub.len_information_elements); | |
327 | meshcfg = find_ie(WLAN_EID_MESH_CONFIG, | |
328 | res->pub.information_elements, | |
329 | res->pub.len_information_elements); | |
330 | if (!meshid || !meshcfg || | |
331 | meshcfg[1] != IEEE80211_MESH_CONFIG_LEN) { | |
332 | /* bogus mesh */ | |
333 | kref_put(&res->ref, bss_release); | |
334 | return NULL; | |
335 | } | |
336 | } | |
337 | ||
338 | spin_lock_bh(&dev->bss_lock); | |
339 | ||
340 | found = rb_find_bss(dev, res); | |
341 | ||
342 | if (found && overwrite) { | |
343 | list_replace(&found->list, &res->list); | |
344 | rb_replace_node(&found->rbn, &res->rbn, | |
345 | &dev->bss_tree); | |
346 | kref_put(&found->ref, bss_release); | |
347 | found = res; | |
348 | } else if (found) { | |
349 | kref_get(&found->ref); | |
350 | found->pub.beacon_interval = res->pub.beacon_interval; | |
351 | found->pub.tsf = res->pub.tsf; | |
352 | found->pub.signal = res->pub.signal; | |
353 | found->pub.signal_type = res->pub.signal_type; | |
354 | found->pub.capability = res->pub.capability; | |
355 | found->ts = res->ts; | |
356 | kref_put(&res->ref, bss_release); | |
357 | } else { | |
358 | /* this "consumes" the reference */ | |
359 | list_add_tail(&res->list, &dev->bss_list); | |
360 | rb_insert_bss(dev, res); | |
361 | found = res; | |
362 | } | |
363 | ||
364 | dev->bss_generation++; | |
365 | spin_unlock_bh(&dev->bss_lock); | |
366 | ||
367 | kref_get(&found->ref); | |
368 | return found; | |
369 | } | |
370 | ||
371 | struct cfg80211_bss * | |
372 | cfg80211_inform_bss_frame(struct wiphy *wiphy, | |
373 | struct ieee80211_channel *channel, | |
374 | struct ieee80211_mgmt *mgmt, size_t len, | |
375 | s32 signal, enum cfg80211_signal_type sigtype, | |
376 | gfp_t gfp) | |
377 | { | |
378 | struct cfg80211_internal_bss *res; | |
379 | size_t ielen = len - offsetof(struct ieee80211_mgmt, | |
380 | u.probe_resp.variable); | |
381 | bool overwrite; | |
382 | size_t privsz = wiphy->bss_priv_size; | |
383 | ||
384 | if (WARN_ON(sigtype == NL80211_BSS_SIGNAL_UNSPEC && | |
385 | (signal < 0 || signal > 100))) | |
386 | return NULL; | |
387 | ||
388 | if (WARN_ON(!mgmt || !wiphy || | |
389 | len < offsetof(struct ieee80211_mgmt, u.probe_resp.variable))) | |
390 | return NULL; | |
391 | ||
392 | res = kzalloc(sizeof(*res) + privsz + ielen, gfp); | |
393 | if (!res) | |
394 | return NULL; | |
395 | ||
396 | memcpy(res->pub.bssid, mgmt->bssid, ETH_ALEN); | |
397 | res->pub.channel = channel; | |
398 | res->pub.signal_type = sigtype; | |
399 | res->pub.signal = signal; | |
400 | res->pub.tsf = le64_to_cpu(mgmt->u.probe_resp.timestamp); | |
401 | res->pub.beacon_interval = le16_to_cpu(mgmt->u.probe_resp.beacon_int); | |
402 | res->pub.capability = le16_to_cpu(mgmt->u.probe_resp.capab_info); | |
403 | /* point to after the private area */ | |
404 | res->pub.information_elements = (u8 *)res + sizeof(*res) + privsz; | |
405 | memcpy(res->pub.information_elements, mgmt->u.probe_resp.variable, ielen); | |
406 | res->pub.len_information_elements = ielen; | |
407 | ||
408 | kref_init(&res->ref); | |
409 | ||
410 | overwrite = ieee80211_is_probe_resp(mgmt->frame_control); | |
411 | ||
412 | res = cfg80211_bss_update(wiphy_to_dev(wiphy), res, overwrite); | |
413 | if (!res) | |
414 | return NULL; | |
415 | ||
416 | /* cfg80211_bss_update gives us a referenced result */ | |
417 | return &res->pub; | |
418 | } | |
419 | EXPORT_SYMBOL(cfg80211_inform_bss_frame); | |
420 | ||
421 | void cfg80211_put_bss(struct cfg80211_bss *pub) | |
422 | { | |
423 | struct cfg80211_internal_bss *bss; | |
424 | ||
425 | if (!pub) | |
426 | return; | |
427 | ||
428 | bss = container_of(pub, struct cfg80211_internal_bss, pub); | |
429 | kref_put(&bss->ref, bss_release); | |
430 | } | |
431 | EXPORT_SYMBOL(cfg80211_put_bss); | |
432 | ||
433 | #ifdef CONFIG_WIRELESS_EXT | |
434 | int cfg80211_wext_siwscan(struct net_device *dev, | |
435 | struct iw_request_info *info, | |
436 | union iwreq_data *wrqu, char *extra) | |
437 | { | |
438 | struct cfg80211_registered_device *rdev; | |
439 | struct wiphy *wiphy; | |
440 | struct iw_scan_req *wreq = NULL; | |
441 | struct cfg80211_scan_request *creq; | |
442 | int i, err, n_channels = 0; | |
443 | enum ieee80211_band band; | |
444 | ||
445 | if (!netif_running(dev)) | |
446 | return -ENETDOWN; | |
447 | ||
448 | rdev = cfg80211_get_dev_from_ifindex(dev->ifindex); | |
449 | ||
450 | if (IS_ERR(rdev)) | |
451 | return PTR_ERR(rdev); | |
452 | ||
453 | if (rdev->scan_req) { | |
454 | err = -EBUSY; | |
455 | goto out; | |
456 | } | |
457 | ||
458 | wiphy = &rdev->wiphy; | |
459 | ||
460 | for (band = 0; band < IEEE80211_NUM_BANDS; band++) | |
461 | if (wiphy->bands[band]) | |
462 | n_channels += wiphy->bands[band]->n_channels; | |
463 | ||
464 | creq = kzalloc(sizeof(*creq) + sizeof(struct cfg80211_ssid) + | |
465 | n_channels * sizeof(void *), | |
466 | GFP_ATOMIC); | |
467 | if (!creq) { | |
468 | err = -ENOMEM; | |
469 | goto out; | |
470 | } | |
471 | ||
472 | creq->wiphy = wiphy; | |
473 | creq->ifidx = dev->ifindex; | |
474 | creq->ssids = (void *)(creq + 1); | |
475 | creq->channels = (void *)(creq->ssids + 1); | |
476 | creq->n_channels = n_channels; | |
477 | creq->n_ssids = 1; | |
478 | ||
479 | /* all channels */ | |
480 | i = 0; | |
481 | for (band = 0; band < IEEE80211_NUM_BANDS; band++) { | |
482 | int j; | |
483 | if (!wiphy->bands[band]) | |
484 | continue; | |
485 | for (j = 0; j < wiphy->bands[band]->n_channels; j++) { | |
486 | creq->channels[i] = &wiphy->bands[band]->channels[j]; | |
487 | i++; | |
488 | } | |
489 | } | |
490 | ||
491 | /* translate scan request */ | |
492 | if (wrqu->data.length == sizeof(struct iw_scan_req)) { | |
493 | wreq = (struct iw_scan_req *)extra; | |
494 | ||
495 | if (wrqu->data.flags & IW_SCAN_THIS_ESSID) { | |
496 | if (wreq->essid_len > IEEE80211_MAX_SSID_LEN) | |
497 | return -EINVAL; | |
498 | memcpy(creq->ssids[0].ssid, wreq->essid, wreq->essid_len); | |
499 | creq->ssids[0].ssid_len = wreq->essid_len; | |
500 | } | |
501 | if (wreq->scan_type == IW_SCAN_TYPE_PASSIVE) | |
502 | creq->n_ssids = 0; | |
503 | } | |
504 | ||
505 | rdev->scan_req = creq; | |
506 | err = rdev->ops->scan(wiphy, dev, creq); | |
507 | if (err) { | |
508 | rdev->scan_req = NULL; | |
509 | kfree(creq); | |
510 | } | |
511 | out: | |
512 | cfg80211_put_dev(rdev); | |
513 | return err; | |
514 | } | |
515 | EXPORT_SYMBOL(cfg80211_wext_siwscan); | |
516 | ||
517 | static void ieee80211_scan_add_ies(struct iw_request_info *info, | |
518 | struct cfg80211_bss *bss, | |
519 | char **current_ev, char *end_buf) | |
520 | { | |
521 | u8 *pos, *end, *next; | |
522 | struct iw_event iwe; | |
523 | ||
524 | if (!bss->information_elements || | |
525 | !bss->len_information_elements) | |
526 | return; | |
527 | ||
528 | /* | |
529 | * If needed, fragment the IEs buffer (at IE boundaries) into short | |
530 | * enough fragments to fit into IW_GENERIC_IE_MAX octet messages. | |
531 | */ | |
532 | pos = bss->information_elements; | |
533 | end = pos + bss->len_information_elements; | |
534 | ||
535 | while (end - pos > IW_GENERIC_IE_MAX) { | |
536 | next = pos + 2 + pos[1]; | |
537 | while (next + 2 + next[1] - pos < IW_GENERIC_IE_MAX) | |
538 | next = next + 2 + next[1]; | |
539 | ||
540 | memset(&iwe, 0, sizeof(iwe)); | |
541 | iwe.cmd = IWEVGENIE; | |
542 | iwe.u.data.length = next - pos; | |
543 | *current_ev = iwe_stream_add_point(info, *current_ev, | |
544 | end_buf, &iwe, pos); | |
545 | ||
546 | pos = next; | |
547 | } | |
548 | ||
549 | if (end > pos) { | |
550 | memset(&iwe, 0, sizeof(iwe)); | |
551 | iwe.cmd = IWEVGENIE; | |
552 | iwe.u.data.length = end - pos; | |
553 | *current_ev = iwe_stream_add_point(info, *current_ev, | |
554 | end_buf, &iwe, pos); | |
555 | } | |
556 | } | |
557 | ||
558 | ||
559 | static char * | |
560 | ieee80211_bss(struct iw_request_info *info, | |
561 | struct cfg80211_internal_bss *bss, | |
562 | char *current_ev, char *end_buf) | |
563 | { | |
564 | struct iw_event iwe; | |
565 | u8 *buf, *cfg, *p; | |
566 | u8 *ie = bss->pub.information_elements; | |
567 | int rem = bss->pub.len_information_elements, i; | |
568 | bool ismesh = false; | |
569 | ||
570 | memset(&iwe, 0, sizeof(iwe)); | |
571 | iwe.cmd = SIOCGIWAP; | |
572 | iwe.u.ap_addr.sa_family = ARPHRD_ETHER; | |
573 | memcpy(iwe.u.ap_addr.sa_data, bss->pub.bssid, ETH_ALEN); | |
574 | current_ev = iwe_stream_add_event(info, current_ev, end_buf, &iwe, | |
575 | IW_EV_ADDR_LEN); | |
576 | ||
577 | memset(&iwe, 0, sizeof(iwe)); | |
578 | iwe.cmd = SIOCGIWFREQ; | |
579 | iwe.u.freq.m = ieee80211_frequency_to_channel(bss->pub.channel->center_freq); | |
580 | iwe.u.freq.e = 0; | |
581 | current_ev = iwe_stream_add_event(info, current_ev, end_buf, &iwe, | |
582 | IW_EV_FREQ_LEN); | |
583 | ||
584 | memset(&iwe, 0, sizeof(iwe)); | |
585 | iwe.cmd = SIOCGIWFREQ; | |
586 | iwe.u.freq.m = bss->pub.channel->center_freq; | |
587 | iwe.u.freq.e = 6; | |
588 | current_ev = iwe_stream_add_event(info, current_ev, end_buf, &iwe, | |
589 | IW_EV_FREQ_LEN); | |
590 | ||
591 | if (bss->pub.signal_type != CFG80211_SIGNAL_TYPE_NONE) { | |
592 | memset(&iwe, 0, sizeof(iwe)); | |
593 | iwe.cmd = IWEVQUAL; | |
594 | iwe.u.qual.updated = IW_QUAL_LEVEL_UPDATED | | |
595 | IW_QUAL_NOISE_INVALID | | |
596 | IW_QUAL_QUAL_INVALID; | |
597 | switch (bss->pub.signal_type) { | |
598 | case CFG80211_SIGNAL_TYPE_MBM: | |
599 | iwe.u.qual.level = bss->pub.signal / 100; | |
600 | iwe.u.qual.updated |= IW_QUAL_DBM; | |
601 | break; | |
602 | case CFG80211_SIGNAL_TYPE_UNSPEC: | |
603 | iwe.u.qual.level = bss->pub.signal; | |
604 | break; | |
605 | default: | |
606 | /* not reached */ | |
607 | break; | |
608 | } | |
609 | current_ev = iwe_stream_add_event(info, current_ev, end_buf, | |
610 | &iwe, IW_EV_QUAL_LEN); | |
611 | } | |
612 | ||
613 | memset(&iwe, 0, sizeof(iwe)); | |
614 | iwe.cmd = SIOCGIWENCODE; | |
615 | if (bss->pub.capability & WLAN_CAPABILITY_PRIVACY) | |
616 | iwe.u.data.flags = IW_ENCODE_ENABLED | IW_ENCODE_NOKEY; | |
617 | else | |
618 | iwe.u.data.flags = IW_ENCODE_DISABLED; | |
619 | iwe.u.data.length = 0; | |
620 | current_ev = iwe_stream_add_point(info, current_ev, end_buf, | |
621 | &iwe, ""); | |
622 | ||
623 | while (rem >= 2) { | |
624 | /* invalid data */ | |
625 | if (ie[1] > rem - 2) | |
626 | break; | |
627 | ||
628 | switch (ie[0]) { | |
629 | case WLAN_EID_SSID: | |
630 | memset(&iwe, 0, sizeof(iwe)); | |
631 | iwe.cmd = SIOCGIWESSID; | |
632 | iwe.u.data.length = ie[1]; | |
633 | iwe.u.data.flags = 1; | |
634 | current_ev = iwe_stream_add_point(info, current_ev, end_buf, | |
635 | &iwe, ie + 2); | |
636 | break; | |
637 | case WLAN_EID_MESH_ID: | |
638 | memset(&iwe, 0, sizeof(iwe)); | |
639 | iwe.cmd = SIOCGIWESSID; | |
640 | iwe.u.data.length = ie[1]; | |
641 | iwe.u.data.flags = 1; | |
642 | current_ev = iwe_stream_add_point(info, current_ev, end_buf, | |
643 | &iwe, ie + 2); | |
644 | break; | |
645 | case WLAN_EID_MESH_CONFIG: | |
646 | ismesh = true; | |
647 | if (ie[1] != IEEE80211_MESH_CONFIG_LEN) | |
648 | break; | |
649 | buf = kmalloc(50, GFP_ATOMIC); | |
650 | if (!buf) | |
651 | break; | |
652 | cfg = ie + 2; | |
653 | memset(&iwe, 0, sizeof(iwe)); | |
654 | iwe.cmd = IWEVCUSTOM; | |
655 | sprintf(buf, "Mesh network (version %d)", cfg[0]); | |
656 | iwe.u.data.length = strlen(buf); | |
657 | current_ev = iwe_stream_add_point(info, current_ev, | |
658 | end_buf, | |
659 | &iwe, buf); | |
660 | sprintf(buf, "Path Selection Protocol ID: " | |
661 | "0x%02X%02X%02X%02X", cfg[1], cfg[2], cfg[3], | |
662 | cfg[4]); | |
663 | iwe.u.data.length = strlen(buf); | |
664 | current_ev = iwe_stream_add_point(info, current_ev, | |
665 | end_buf, | |
666 | &iwe, buf); | |
667 | sprintf(buf, "Path Selection Metric ID: " | |
668 | "0x%02X%02X%02X%02X", cfg[5], cfg[6], cfg[7], | |
669 | cfg[8]); | |
670 | iwe.u.data.length = strlen(buf); | |
671 | current_ev = iwe_stream_add_point(info, current_ev, | |
672 | end_buf, | |
673 | &iwe, buf); | |
674 | sprintf(buf, "Congestion Control Mode ID: " | |
675 | "0x%02X%02X%02X%02X", cfg[9], cfg[10], | |
676 | cfg[11], cfg[12]); | |
677 | iwe.u.data.length = strlen(buf); | |
678 | current_ev = iwe_stream_add_point(info, current_ev, | |
679 | end_buf, | |
680 | &iwe, buf); | |
681 | sprintf(buf, "Channel Precedence: " | |
682 | "0x%02X%02X%02X%02X", cfg[13], cfg[14], | |
683 | cfg[15], cfg[16]); | |
684 | iwe.u.data.length = strlen(buf); | |
685 | current_ev = iwe_stream_add_point(info, current_ev, | |
686 | end_buf, | |
687 | &iwe, buf); | |
688 | kfree(buf); | |
689 | break; | |
690 | case WLAN_EID_SUPP_RATES: | |
691 | case WLAN_EID_EXT_SUPP_RATES: | |
692 | /* display all supported rates in readable format */ | |
693 | p = current_ev + iwe_stream_lcp_len(info); | |
694 | ||
695 | memset(&iwe, 0, sizeof(iwe)); | |
696 | iwe.cmd = SIOCGIWRATE; | |
697 | /* Those two flags are ignored... */ | |
698 | iwe.u.bitrate.fixed = iwe.u.bitrate.disabled = 0; | |
699 | ||
700 | for (i = 0; i < ie[1]; i++) { | |
701 | iwe.u.bitrate.value = | |
702 | ((ie[i + 2] & 0x7f) * 500000); | |
703 | p = iwe_stream_add_value(info, current_ev, p, | |
704 | end_buf, &iwe, IW_EV_PARAM_LEN); | |
705 | } | |
706 | current_ev = p; | |
707 | break; | |
708 | } | |
709 | rem -= ie[1] + 2; | |
710 | ie += ie[1] + 2; | |
711 | } | |
712 | ||
713 | if (bss->pub.capability & (WLAN_CAPABILITY_ESS | WLAN_CAPABILITY_IBSS) | |
714 | || ismesh) { | |
715 | memset(&iwe, 0, sizeof(iwe)); | |
716 | iwe.cmd = SIOCGIWMODE; | |
717 | if (ismesh) | |
718 | iwe.u.mode = IW_MODE_MESH; | |
719 | else if (bss->pub.capability & WLAN_CAPABILITY_ESS) | |
720 | iwe.u.mode = IW_MODE_MASTER; | |
721 | else | |
722 | iwe.u.mode = IW_MODE_ADHOC; | |
723 | current_ev = iwe_stream_add_event(info, current_ev, end_buf, | |
724 | &iwe, IW_EV_UINT_LEN); | |
725 | } | |
726 | ||
727 | buf = kmalloc(30, GFP_ATOMIC); | |
728 | if (buf) { | |
729 | memset(&iwe, 0, sizeof(iwe)); | |
730 | iwe.cmd = IWEVCUSTOM; | |
731 | sprintf(buf, "tsf=%016llx", (unsigned long long)(bss->pub.tsf)); | |
732 | iwe.u.data.length = strlen(buf); | |
733 | current_ev = iwe_stream_add_point(info, current_ev, end_buf, | |
734 | &iwe, buf); | |
735 | memset(&iwe, 0, sizeof(iwe)); | |
736 | iwe.cmd = IWEVCUSTOM; | |
737 | sprintf(buf, " Last beacon: %dms ago", | |
738 | jiffies_to_msecs(jiffies - bss->ts)); | |
739 | iwe.u.data.length = strlen(buf); | |
740 | current_ev = iwe_stream_add_point(info, current_ev, | |
741 | end_buf, &iwe, buf); | |
742 | kfree(buf); | |
743 | } | |
744 | ||
745 | ieee80211_scan_add_ies(info, &bss->pub, ¤t_ev, end_buf); | |
746 | ||
747 | return current_ev; | |
748 | } | |
749 | ||
750 | ||
751 | static int ieee80211_scan_results(struct cfg80211_registered_device *dev, | |
752 | struct iw_request_info *info, | |
753 | char *buf, size_t len) | |
754 | { | |
755 | char *current_ev = buf; | |
756 | char *end_buf = buf + len; | |
757 | struct cfg80211_internal_bss *bss; | |
758 | ||
759 | spin_lock_bh(&dev->bss_lock); | |
760 | cfg80211_bss_expire(dev); | |
761 | ||
762 | list_for_each_entry(bss, &dev->bss_list, list) { | |
763 | if (buf + len - current_ev <= IW_EV_ADDR_LEN) { | |
764 | spin_unlock_bh(&dev->bss_lock); | |
765 | return -E2BIG; | |
766 | } | |
767 | current_ev = ieee80211_bss(info, bss, | |
768 | current_ev, end_buf); | |
769 | } | |
770 | spin_unlock_bh(&dev->bss_lock); | |
771 | return current_ev - buf; | |
772 | } | |
773 | ||
774 | ||
775 | int cfg80211_wext_giwscan(struct net_device *dev, | |
776 | struct iw_request_info *info, | |
777 | struct iw_point *data, char *extra) | |
778 | { | |
779 | struct cfg80211_registered_device *rdev; | |
780 | int res; | |
781 | ||
782 | if (!netif_running(dev)) | |
783 | return -ENETDOWN; | |
784 | ||
785 | rdev = cfg80211_get_dev_from_ifindex(dev->ifindex); | |
786 | ||
787 | if (IS_ERR(rdev)) | |
788 | return PTR_ERR(rdev); | |
789 | ||
790 | if (rdev->scan_req) { | |
791 | res = -EAGAIN; | |
792 | goto out; | |
793 | } | |
794 | ||
795 | res = ieee80211_scan_results(rdev, info, extra, data->length); | |
796 | data->length = 0; | |
797 | if (res >= 0) { | |
798 | data->length = res; | |
799 | res = 0; | |
800 | } | |
801 | ||
802 | out: | |
803 | cfg80211_put_dev(rdev); | |
804 | return res; | |
805 | } | |
806 | EXPORT_SYMBOL(cfg80211_wext_giwscan); | |
807 | #endif |