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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); | |
78c1c7e1 JB |
59 | if (bss->pub.free_priv) |
60 | bss->pub.free_priv(&bss->pub); | |
2a519311 JB |
61 | kfree(bss); |
62 | } | |
63 | ||
64 | /* must hold dev->bss_lock! */ | |
65 | void cfg80211_bss_expire(struct cfg80211_registered_device *dev) | |
66 | { | |
67 | struct cfg80211_internal_bss *bss, *tmp; | |
68 | bool expired = false; | |
69 | ||
70 | list_for_each_entry_safe(bss, tmp, &dev->bss_list, list) { | |
71 | if (!time_after(jiffies, bss->ts + IEEE80211_SCAN_RESULT_EXPIRE)) | |
72 | continue; | |
73 | list_del(&bss->list); | |
74 | rb_erase(&bss->rbn, &dev->bss_tree); | |
75 | kref_put(&bss->ref, bss_release); | |
76 | expired = true; | |
77 | } | |
78 | ||
79 | if (expired) | |
80 | dev->bss_generation++; | |
81 | } | |
82 | ||
83 | static u8 *find_ie(u8 num, u8 *ies, size_t len) | |
84 | { | |
85 | while (len > 2 && ies[0] != num) { | |
86 | len -= ies[1] + 2; | |
87 | ies += ies[1] + 2; | |
88 | } | |
89 | if (len < 2) | |
90 | return NULL; | |
91 | if (len < 2 + ies[1]) | |
92 | return NULL; | |
93 | return ies; | |
94 | } | |
95 | ||
96 | static int cmp_ies(u8 num, u8 *ies1, size_t len1, u8 *ies2, size_t len2) | |
97 | { | |
98 | const u8 *ie1 = find_ie(num, ies1, len1); | |
99 | const u8 *ie2 = find_ie(num, ies2, len2); | |
100 | int r; | |
101 | ||
102 | if (!ie1 && !ie2) | |
103 | return 0; | |
104 | if (!ie1) | |
105 | return -1; | |
106 | ||
107 | r = memcmp(ie1 + 2, ie2 + 2, min(ie1[1], ie2[1])); | |
108 | if (r == 0 && ie1[1] != ie2[1]) | |
109 | return ie2[1] - ie1[1]; | |
110 | return r; | |
111 | } | |
112 | ||
113 | static bool is_bss(struct cfg80211_bss *a, | |
114 | const u8 *bssid, | |
115 | const u8 *ssid, size_t ssid_len) | |
116 | { | |
117 | const u8 *ssidie; | |
118 | ||
119 | if (compare_ether_addr(a->bssid, bssid)) | |
120 | return false; | |
121 | ||
122 | ssidie = find_ie(WLAN_EID_SSID, | |
123 | a->information_elements, | |
124 | a->len_information_elements); | |
125 | if (!ssidie) | |
126 | return false; | |
127 | if (ssidie[1] != ssid_len) | |
128 | return false; | |
129 | return memcmp(ssidie + 2, ssid, ssid_len) == 0; | |
130 | } | |
131 | ||
132 | static bool is_mesh(struct cfg80211_bss *a, | |
133 | const u8 *meshid, size_t meshidlen, | |
134 | const u8 *meshcfg) | |
135 | { | |
136 | const u8 *ie; | |
137 | ||
138 | if (!is_zero_ether_addr(a->bssid)) | |
139 | return false; | |
140 | ||
141 | ie = find_ie(WLAN_EID_MESH_ID, | |
142 | a->information_elements, | |
143 | a->len_information_elements); | |
144 | if (!ie) | |
145 | return false; | |
146 | if (ie[1] != meshidlen) | |
147 | return false; | |
148 | if (memcmp(ie + 2, meshid, meshidlen)) | |
149 | return false; | |
150 | ||
151 | ie = find_ie(WLAN_EID_MESH_CONFIG, | |
152 | a->information_elements, | |
153 | a->len_information_elements); | |
154 | if (ie[1] != IEEE80211_MESH_CONFIG_LEN) | |
155 | return false; | |
156 | ||
157 | /* | |
158 | * Ignore mesh capability (last two bytes of the IE) when | |
159 | * comparing since that may differ between stations taking | |
160 | * part in the same mesh. | |
161 | */ | |
162 | return memcmp(ie + 2, meshcfg, IEEE80211_MESH_CONFIG_LEN - 2) == 0; | |
163 | } | |
164 | ||
165 | static int cmp_bss(struct cfg80211_bss *a, | |
166 | struct cfg80211_bss *b) | |
167 | { | |
168 | int r; | |
169 | ||
170 | if (a->channel != b->channel) | |
171 | return b->channel->center_freq - a->channel->center_freq; | |
172 | ||
173 | r = memcmp(a->bssid, b->bssid, ETH_ALEN); | |
174 | if (r) | |
175 | return r; | |
176 | ||
177 | if (is_zero_ether_addr(a->bssid)) { | |
178 | r = cmp_ies(WLAN_EID_MESH_ID, | |
179 | a->information_elements, | |
180 | a->len_information_elements, | |
181 | b->information_elements, | |
182 | b->len_information_elements); | |
183 | if (r) | |
184 | return r; | |
185 | return cmp_ies(WLAN_EID_MESH_CONFIG, | |
186 | a->information_elements, | |
187 | a->len_information_elements, | |
188 | b->information_elements, | |
189 | b->len_information_elements); | |
190 | } | |
191 | ||
192 | return cmp_ies(WLAN_EID_SSID, | |
193 | a->information_elements, | |
194 | a->len_information_elements, | |
195 | b->information_elements, | |
196 | b->len_information_elements); | |
197 | } | |
198 | ||
199 | struct cfg80211_bss *cfg80211_get_bss(struct wiphy *wiphy, | |
200 | struct ieee80211_channel *channel, | |
201 | const u8 *bssid, | |
202 | const u8 *ssid, size_t ssid_len) | |
203 | { | |
204 | struct cfg80211_registered_device *dev = wiphy_to_dev(wiphy); | |
205 | struct cfg80211_internal_bss *bss, *res = NULL; | |
206 | ||
207 | spin_lock_bh(&dev->bss_lock); | |
208 | ||
209 | list_for_each_entry(bss, &dev->bss_list, list) { | |
210 | if (channel && bss->pub.channel != channel) | |
211 | continue; | |
212 | if (is_bss(&bss->pub, bssid, ssid, ssid_len)) { | |
213 | res = bss; | |
214 | kref_get(&res->ref); | |
215 | break; | |
216 | } | |
217 | } | |
218 | ||
219 | spin_unlock_bh(&dev->bss_lock); | |
220 | if (!res) | |
221 | return NULL; | |
222 | return &res->pub; | |
223 | } | |
224 | EXPORT_SYMBOL(cfg80211_get_bss); | |
225 | ||
226 | struct cfg80211_bss *cfg80211_get_mesh(struct wiphy *wiphy, | |
227 | struct ieee80211_channel *channel, | |
228 | const u8 *meshid, size_t meshidlen, | |
229 | const u8 *meshcfg) | |
230 | { | |
231 | struct cfg80211_registered_device *dev = wiphy_to_dev(wiphy); | |
232 | struct cfg80211_internal_bss *bss, *res = NULL; | |
233 | ||
234 | spin_lock_bh(&dev->bss_lock); | |
235 | ||
236 | list_for_each_entry(bss, &dev->bss_list, list) { | |
237 | if (channel && bss->pub.channel != channel) | |
238 | continue; | |
239 | if (is_mesh(&bss->pub, meshid, meshidlen, meshcfg)) { | |
240 | res = bss; | |
241 | kref_get(&res->ref); | |
242 | break; | |
243 | } | |
244 | } | |
245 | ||
246 | spin_unlock_bh(&dev->bss_lock); | |
247 | if (!res) | |
248 | return NULL; | |
249 | return &res->pub; | |
250 | } | |
251 | EXPORT_SYMBOL(cfg80211_get_mesh); | |
252 | ||
253 | ||
254 | static void rb_insert_bss(struct cfg80211_registered_device *dev, | |
255 | struct cfg80211_internal_bss *bss) | |
256 | { | |
257 | struct rb_node **p = &dev->bss_tree.rb_node; | |
258 | struct rb_node *parent = NULL; | |
259 | struct cfg80211_internal_bss *tbss; | |
260 | int cmp; | |
261 | ||
262 | while (*p) { | |
263 | parent = *p; | |
264 | tbss = rb_entry(parent, struct cfg80211_internal_bss, rbn); | |
265 | ||
266 | cmp = cmp_bss(&bss->pub, &tbss->pub); | |
267 | ||
268 | if (WARN_ON(!cmp)) { | |
269 | /* will sort of leak this BSS */ | |
270 | return; | |
271 | } | |
272 | ||
273 | if (cmp < 0) | |
274 | p = &(*p)->rb_left; | |
275 | else | |
276 | p = &(*p)->rb_right; | |
277 | } | |
278 | ||
279 | rb_link_node(&bss->rbn, parent, p); | |
280 | rb_insert_color(&bss->rbn, &dev->bss_tree); | |
281 | } | |
282 | ||
283 | static struct cfg80211_internal_bss * | |
284 | rb_find_bss(struct cfg80211_registered_device *dev, | |
285 | struct cfg80211_internal_bss *res) | |
286 | { | |
287 | struct rb_node *n = dev->bss_tree.rb_node; | |
288 | struct cfg80211_internal_bss *bss; | |
289 | int r; | |
290 | ||
291 | while (n) { | |
292 | bss = rb_entry(n, struct cfg80211_internal_bss, rbn); | |
293 | r = cmp_bss(&res->pub, &bss->pub); | |
294 | ||
295 | if (r == 0) | |
296 | return bss; | |
297 | else if (r < 0) | |
298 | n = n->rb_left; | |
299 | else | |
300 | n = n->rb_right; | |
301 | } | |
302 | ||
303 | return NULL; | |
304 | } | |
305 | ||
306 | static struct cfg80211_internal_bss * | |
307 | cfg80211_bss_update(struct cfg80211_registered_device *dev, | |
308 | struct cfg80211_internal_bss *res, | |
309 | bool overwrite) | |
310 | { | |
311 | struct cfg80211_internal_bss *found = NULL; | |
312 | const u8 *meshid, *meshcfg; | |
313 | ||
314 | /* | |
315 | * The reference to "res" is donated to this function. | |
316 | */ | |
317 | ||
318 | if (WARN_ON(!res->pub.channel)) { | |
319 | kref_put(&res->ref, bss_release); | |
320 | return NULL; | |
321 | } | |
322 | ||
323 | res->ts = jiffies; | |
324 | ||
325 | if (is_zero_ether_addr(res->pub.bssid)) { | |
326 | /* must be mesh, verify */ | |
327 | meshid = find_ie(WLAN_EID_MESH_ID, res->pub.information_elements, | |
328 | res->pub.len_information_elements); | |
329 | meshcfg = find_ie(WLAN_EID_MESH_CONFIG, | |
330 | res->pub.information_elements, | |
331 | res->pub.len_information_elements); | |
332 | if (!meshid || !meshcfg || | |
333 | meshcfg[1] != IEEE80211_MESH_CONFIG_LEN) { | |
334 | /* bogus mesh */ | |
335 | kref_put(&res->ref, bss_release); | |
336 | return NULL; | |
337 | } | |
338 | } | |
339 | ||
340 | spin_lock_bh(&dev->bss_lock); | |
341 | ||
342 | found = rb_find_bss(dev, res); | |
343 | ||
344 | if (found && overwrite) { | |
345 | list_replace(&found->list, &res->list); | |
346 | rb_replace_node(&found->rbn, &res->rbn, | |
347 | &dev->bss_tree); | |
348 | kref_put(&found->ref, bss_release); | |
349 | found = res; | |
350 | } else if (found) { | |
351 | kref_get(&found->ref); | |
352 | found->pub.beacon_interval = res->pub.beacon_interval; | |
353 | found->pub.tsf = res->pub.tsf; | |
354 | found->pub.signal = res->pub.signal; | |
355 | found->pub.signal_type = res->pub.signal_type; | |
356 | found->pub.capability = res->pub.capability; | |
357 | found->ts = res->ts; | |
358 | kref_put(&res->ref, bss_release); | |
359 | } else { | |
360 | /* this "consumes" the reference */ | |
361 | list_add_tail(&res->list, &dev->bss_list); | |
362 | rb_insert_bss(dev, res); | |
363 | found = res; | |
364 | } | |
365 | ||
366 | dev->bss_generation++; | |
367 | spin_unlock_bh(&dev->bss_lock); | |
368 | ||
369 | kref_get(&found->ref); | |
370 | return found; | |
371 | } | |
372 | ||
373 | struct cfg80211_bss * | |
374 | cfg80211_inform_bss_frame(struct wiphy *wiphy, | |
375 | struct ieee80211_channel *channel, | |
376 | struct ieee80211_mgmt *mgmt, size_t len, | |
377 | s32 signal, enum cfg80211_signal_type sigtype, | |
378 | gfp_t gfp) | |
379 | { | |
380 | struct cfg80211_internal_bss *res; | |
381 | size_t ielen = len - offsetof(struct ieee80211_mgmt, | |
382 | u.probe_resp.variable); | |
383 | bool overwrite; | |
384 | size_t privsz = wiphy->bss_priv_size; | |
385 | ||
386 | if (WARN_ON(sigtype == NL80211_BSS_SIGNAL_UNSPEC && | |
387 | (signal < 0 || signal > 100))) | |
388 | return NULL; | |
389 | ||
390 | if (WARN_ON(!mgmt || !wiphy || | |
391 | len < offsetof(struct ieee80211_mgmt, u.probe_resp.variable))) | |
392 | return NULL; | |
393 | ||
394 | res = kzalloc(sizeof(*res) + privsz + ielen, gfp); | |
395 | if (!res) | |
396 | return NULL; | |
397 | ||
398 | memcpy(res->pub.bssid, mgmt->bssid, ETH_ALEN); | |
399 | res->pub.channel = channel; | |
400 | res->pub.signal_type = sigtype; | |
401 | res->pub.signal = signal; | |
402 | res->pub.tsf = le64_to_cpu(mgmt->u.probe_resp.timestamp); | |
403 | res->pub.beacon_interval = le16_to_cpu(mgmt->u.probe_resp.beacon_int); | |
404 | res->pub.capability = le16_to_cpu(mgmt->u.probe_resp.capab_info); | |
405 | /* point to after the private area */ | |
406 | res->pub.information_elements = (u8 *)res + sizeof(*res) + privsz; | |
407 | memcpy(res->pub.information_elements, mgmt->u.probe_resp.variable, ielen); | |
408 | res->pub.len_information_elements = ielen; | |
409 | ||
410 | kref_init(&res->ref); | |
411 | ||
412 | overwrite = ieee80211_is_probe_resp(mgmt->frame_control); | |
413 | ||
414 | res = cfg80211_bss_update(wiphy_to_dev(wiphy), res, overwrite); | |
415 | if (!res) | |
416 | return NULL; | |
417 | ||
418 | /* cfg80211_bss_update gives us a referenced result */ | |
419 | return &res->pub; | |
420 | } | |
421 | EXPORT_SYMBOL(cfg80211_inform_bss_frame); | |
422 | ||
423 | void cfg80211_put_bss(struct cfg80211_bss *pub) | |
424 | { | |
425 | struct cfg80211_internal_bss *bss; | |
426 | ||
427 | if (!pub) | |
428 | return; | |
429 | ||
430 | bss = container_of(pub, struct cfg80211_internal_bss, pub); | |
431 | kref_put(&bss->ref, bss_release); | |
432 | } | |
433 | EXPORT_SYMBOL(cfg80211_put_bss); | |
434 | ||
435 | #ifdef CONFIG_WIRELESS_EXT | |
436 | int cfg80211_wext_siwscan(struct net_device *dev, | |
437 | struct iw_request_info *info, | |
438 | union iwreq_data *wrqu, char *extra) | |
439 | { | |
440 | struct cfg80211_registered_device *rdev; | |
441 | struct wiphy *wiphy; | |
442 | struct iw_scan_req *wreq = NULL; | |
443 | struct cfg80211_scan_request *creq; | |
444 | int i, err, n_channels = 0; | |
445 | enum ieee80211_band band; | |
446 | ||
447 | if (!netif_running(dev)) | |
448 | return -ENETDOWN; | |
449 | ||
450 | rdev = cfg80211_get_dev_from_ifindex(dev->ifindex); | |
451 | ||
452 | if (IS_ERR(rdev)) | |
453 | return PTR_ERR(rdev); | |
454 | ||
455 | if (rdev->scan_req) { | |
456 | err = -EBUSY; | |
457 | goto out; | |
458 | } | |
459 | ||
460 | wiphy = &rdev->wiphy; | |
461 | ||
462 | for (band = 0; band < IEEE80211_NUM_BANDS; band++) | |
463 | if (wiphy->bands[band]) | |
464 | n_channels += wiphy->bands[band]->n_channels; | |
465 | ||
466 | creq = kzalloc(sizeof(*creq) + sizeof(struct cfg80211_ssid) + | |
467 | n_channels * sizeof(void *), | |
468 | GFP_ATOMIC); | |
469 | if (!creq) { | |
470 | err = -ENOMEM; | |
471 | goto out; | |
472 | } | |
473 | ||
474 | creq->wiphy = wiphy; | |
475 | creq->ifidx = dev->ifindex; | |
476 | creq->ssids = (void *)(creq + 1); | |
477 | creq->channels = (void *)(creq->ssids + 1); | |
478 | creq->n_channels = n_channels; | |
479 | creq->n_ssids = 1; | |
480 | ||
481 | /* all channels */ | |
482 | i = 0; | |
483 | for (band = 0; band < IEEE80211_NUM_BANDS; band++) { | |
484 | int j; | |
485 | if (!wiphy->bands[band]) | |
486 | continue; | |
487 | for (j = 0; j < wiphy->bands[band]->n_channels; j++) { | |
488 | creq->channels[i] = &wiphy->bands[band]->channels[j]; | |
489 | i++; | |
490 | } | |
491 | } | |
492 | ||
493 | /* translate scan request */ | |
494 | if (wrqu->data.length == sizeof(struct iw_scan_req)) { | |
495 | wreq = (struct iw_scan_req *)extra; | |
496 | ||
497 | if (wrqu->data.flags & IW_SCAN_THIS_ESSID) { | |
498 | if (wreq->essid_len > IEEE80211_MAX_SSID_LEN) | |
499 | return -EINVAL; | |
500 | memcpy(creq->ssids[0].ssid, wreq->essid, wreq->essid_len); | |
501 | creq->ssids[0].ssid_len = wreq->essid_len; | |
502 | } | |
503 | if (wreq->scan_type == IW_SCAN_TYPE_PASSIVE) | |
504 | creq->n_ssids = 0; | |
505 | } | |
506 | ||
507 | rdev->scan_req = creq; | |
508 | err = rdev->ops->scan(wiphy, dev, creq); | |
509 | if (err) { | |
510 | rdev->scan_req = NULL; | |
511 | kfree(creq); | |
512 | } | |
513 | out: | |
514 | cfg80211_put_dev(rdev); | |
515 | return err; | |
516 | } | |
517 | EXPORT_SYMBOL(cfg80211_wext_siwscan); | |
518 | ||
519 | static void ieee80211_scan_add_ies(struct iw_request_info *info, | |
520 | struct cfg80211_bss *bss, | |
521 | char **current_ev, char *end_buf) | |
522 | { | |
523 | u8 *pos, *end, *next; | |
524 | struct iw_event iwe; | |
525 | ||
526 | if (!bss->information_elements || | |
527 | !bss->len_information_elements) | |
528 | return; | |
529 | ||
530 | /* | |
531 | * If needed, fragment the IEs buffer (at IE boundaries) into short | |
532 | * enough fragments to fit into IW_GENERIC_IE_MAX octet messages. | |
533 | */ | |
534 | pos = bss->information_elements; | |
535 | end = pos + bss->len_information_elements; | |
536 | ||
537 | while (end - pos > IW_GENERIC_IE_MAX) { | |
538 | next = pos + 2 + pos[1]; | |
539 | while (next + 2 + next[1] - pos < IW_GENERIC_IE_MAX) | |
540 | next = next + 2 + next[1]; | |
541 | ||
542 | memset(&iwe, 0, sizeof(iwe)); | |
543 | iwe.cmd = IWEVGENIE; | |
544 | iwe.u.data.length = next - pos; | |
545 | *current_ev = iwe_stream_add_point(info, *current_ev, | |
546 | end_buf, &iwe, pos); | |
547 | ||
548 | pos = next; | |
549 | } | |
550 | ||
551 | if (end > pos) { | |
552 | memset(&iwe, 0, sizeof(iwe)); | |
553 | iwe.cmd = IWEVGENIE; | |
554 | iwe.u.data.length = end - pos; | |
555 | *current_ev = iwe_stream_add_point(info, *current_ev, | |
556 | end_buf, &iwe, pos); | |
557 | } | |
558 | } | |
559 | ||
560 | ||
561 | static char * | |
562 | ieee80211_bss(struct iw_request_info *info, | |
563 | struct cfg80211_internal_bss *bss, | |
564 | char *current_ev, char *end_buf) | |
565 | { | |
566 | struct iw_event iwe; | |
567 | u8 *buf, *cfg, *p; | |
568 | u8 *ie = bss->pub.information_elements; | |
569 | int rem = bss->pub.len_information_elements, i; | |
570 | bool ismesh = false; | |
571 | ||
572 | memset(&iwe, 0, sizeof(iwe)); | |
573 | iwe.cmd = SIOCGIWAP; | |
574 | iwe.u.ap_addr.sa_family = ARPHRD_ETHER; | |
575 | memcpy(iwe.u.ap_addr.sa_data, bss->pub.bssid, ETH_ALEN); | |
576 | current_ev = iwe_stream_add_event(info, current_ev, end_buf, &iwe, | |
577 | IW_EV_ADDR_LEN); | |
578 | ||
579 | memset(&iwe, 0, sizeof(iwe)); | |
580 | iwe.cmd = SIOCGIWFREQ; | |
581 | iwe.u.freq.m = ieee80211_frequency_to_channel(bss->pub.channel->center_freq); | |
582 | iwe.u.freq.e = 0; | |
583 | current_ev = iwe_stream_add_event(info, current_ev, end_buf, &iwe, | |
584 | IW_EV_FREQ_LEN); | |
585 | ||
586 | memset(&iwe, 0, sizeof(iwe)); | |
587 | iwe.cmd = SIOCGIWFREQ; | |
588 | iwe.u.freq.m = bss->pub.channel->center_freq; | |
589 | iwe.u.freq.e = 6; | |
590 | current_ev = iwe_stream_add_event(info, current_ev, end_buf, &iwe, | |
591 | IW_EV_FREQ_LEN); | |
592 | ||
593 | if (bss->pub.signal_type != CFG80211_SIGNAL_TYPE_NONE) { | |
594 | memset(&iwe, 0, sizeof(iwe)); | |
595 | iwe.cmd = IWEVQUAL; | |
596 | iwe.u.qual.updated = IW_QUAL_LEVEL_UPDATED | | |
597 | IW_QUAL_NOISE_INVALID | | |
598 | IW_QUAL_QUAL_INVALID; | |
599 | switch (bss->pub.signal_type) { | |
600 | case CFG80211_SIGNAL_TYPE_MBM: | |
601 | iwe.u.qual.level = bss->pub.signal / 100; | |
602 | iwe.u.qual.updated |= IW_QUAL_DBM; | |
603 | break; | |
604 | case CFG80211_SIGNAL_TYPE_UNSPEC: | |
605 | iwe.u.qual.level = bss->pub.signal; | |
606 | break; | |
607 | default: | |
608 | /* not reached */ | |
609 | break; | |
610 | } | |
611 | current_ev = iwe_stream_add_event(info, current_ev, end_buf, | |
612 | &iwe, IW_EV_QUAL_LEN); | |
613 | } | |
614 | ||
615 | memset(&iwe, 0, sizeof(iwe)); | |
616 | iwe.cmd = SIOCGIWENCODE; | |
617 | if (bss->pub.capability & WLAN_CAPABILITY_PRIVACY) | |
618 | iwe.u.data.flags = IW_ENCODE_ENABLED | IW_ENCODE_NOKEY; | |
619 | else | |
620 | iwe.u.data.flags = IW_ENCODE_DISABLED; | |
621 | iwe.u.data.length = 0; | |
622 | current_ev = iwe_stream_add_point(info, current_ev, end_buf, | |
623 | &iwe, ""); | |
624 | ||
625 | while (rem >= 2) { | |
626 | /* invalid data */ | |
627 | if (ie[1] > rem - 2) | |
628 | break; | |
629 | ||
630 | switch (ie[0]) { | |
631 | case WLAN_EID_SSID: | |
632 | memset(&iwe, 0, sizeof(iwe)); | |
633 | iwe.cmd = SIOCGIWESSID; | |
634 | iwe.u.data.length = ie[1]; | |
635 | iwe.u.data.flags = 1; | |
636 | current_ev = iwe_stream_add_point(info, current_ev, end_buf, | |
637 | &iwe, ie + 2); | |
638 | break; | |
639 | case WLAN_EID_MESH_ID: | |
640 | memset(&iwe, 0, sizeof(iwe)); | |
641 | iwe.cmd = SIOCGIWESSID; | |
642 | iwe.u.data.length = ie[1]; | |
643 | iwe.u.data.flags = 1; | |
644 | current_ev = iwe_stream_add_point(info, current_ev, end_buf, | |
645 | &iwe, ie + 2); | |
646 | break; | |
647 | case WLAN_EID_MESH_CONFIG: | |
648 | ismesh = true; | |
649 | if (ie[1] != IEEE80211_MESH_CONFIG_LEN) | |
650 | break; | |
651 | buf = kmalloc(50, GFP_ATOMIC); | |
652 | if (!buf) | |
653 | break; | |
654 | cfg = ie + 2; | |
655 | memset(&iwe, 0, sizeof(iwe)); | |
656 | iwe.cmd = IWEVCUSTOM; | |
657 | sprintf(buf, "Mesh network (version %d)", cfg[0]); | |
658 | iwe.u.data.length = strlen(buf); | |
659 | current_ev = iwe_stream_add_point(info, current_ev, | |
660 | end_buf, | |
661 | &iwe, buf); | |
662 | sprintf(buf, "Path Selection Protocol ID: " | |
663 | "0x%02X%02X%02X%02X", cfg[1], cfg[2], cfg[3], | |
664 | cfg[4]); | |
665 | iwe.u.data.length = strlen(buf); | |
666 | current_ev = iwe_stream_add_point(info, current_ev, | |
667 | end_buf, | |
668 | &iwe, buf); | |
669 | sprintf(buf, "Path Selection Metric ID: " | |
670 | "0x%02X%02X%02X%02X", cfg[5], cfg[6], cfg[7], | |
671 | cfg[8]); | |
672 | iwe.u.data.length = strlen(buf); | |
673 | current_ev = iwe_stream_add_point(info, current_ev, | |
674 | end_buf, | |
675 | &iwe, buf); | |
676 | sprintf(buf, "Congestion Control Mode ID: " | |
677 | "0x%02X%02X%02X%02X", cfg[9], cfg[10], | |
678 | cfg[11], cfg[12]); | |
679 | iwe.u.data.length = strlen(buf); | |
680 | current_ev = iwe_stream_add_point(info, current_ev, | |
681 | end_buf, | |
682 | &iwe, buf); | |
683 | sprintf(buf, "Channel Precedence: " | |
684 | "0x%02X%02X%02X%02X", cfg[13], cfg[14], | |
685 | cfg[15], cfg[16]); | |
686 | iwe.u.data.length = strlen(buf); | |
687 | current_ev = iwe_stream_add_point(info, current_ev, | |
688 | end_buf, | |
689 | &iwe, buf); | |
690 | kfree(buf); | |
691 | break; | |
692 | case WLAN_EID_SUPP_RATES: | |
693 | case WLAN_EID_EXT_SUPP_RATES: | |
694 | /* display all supported rates in readable format */ | |
695 | p = current_ev + iwe_stream_lcp_len(info); | |
696 | ||
697 | memset(&iwe, 0, sizeof(iwe)); | |
698 | iwe.cmd = SIOCGIWRATE; | |
699 | /* Those two flags are ignored... */ | |
700 | iwe.u.bitrate.fixed = iwe.u.bitrate.disabled = 0; | |
701 | ||
702 | for (i = 0; i < ie[1]; i++) { | |
703 | iwe.u.bitrate.value = | |
704 | ((ie[i + 2] & 0x7f) * 500000); | |
705 | p = iwe_stream_add_value(info, current_ev, p, | |
706 | end_buf, &iwe, IW_EV_PARAM_LEN); | |
707 | } | |
708 | current_ev = p; | |
709 | break; | |
710 | } | |
711 | rem -= ie[1] + 2; | |
712 | ie += ie[1] + 2; | |
713 | } | |
714 | ||
715 | if (bss->pub.capability & (WLAN_CAPABILITY_ESS | WLAN_CAPABILITY_IBSS) | |
716 | || ismesh) { | |
717 | memset(&iwe, 0, sizeof(iwe)); | |
718 | iwe.cmd = SIOCGIWMODE; | |
719 | if (ismesh) | |
720 | iwe.u.mode = IW_MODE_MESH; | |
721 | else if (bss->pub.capability & WLAN_CAPABILITY_ESS) | |
722 | iwe.u.mode = IW_MODE_MASTER; | |
723 | else | |
724 | iwe.u.mode = IW_MODE_ADHOC; | |
725 | current_ev = iwe_stream_add_event(info, current_ev, end_buf, | |
726 | &iwe, IW_EV_UINT_LEN); | |
727 | } | |
728 | ||
729 | buf = kmalloc(30, GFP_ATOMIC); | |
730 | if (buf) { | |
731 | memset(&iwe, 0, sizeof(iwe)); | |
732 | iwe.cmd = IWEVCUSTOM; | |
733 | sprintf(buf, "tsf=%016llx", (unsigned long long)(bss->pub.tsf)); | |
734 | iwe.u.data.length = strlen(buf); | |
735 | current_ev = iwe_stream_add_point(info, current_ev, end_buf, | |
736 | &iwe, buf); | |
737 | memset(&iwe, 0, sizeof(iwe)); | |
738 | iwe.cmd = IWEVCUSTOM; | |
739 | sprintf(buf, " Last beacon: %dms ago", | |
740 | jiffies_to_msecs(jiffies - bss->ts)); | |
741 | iwe.u.data.length = strlen(buf); | |
742 | current_ev = iwe_stream_add_point(info, current_ev, | |
743 | end_buf, &iwe, buf); | |
744 | kfree(buf); | |
745 | } | |
746 | ||
747 | ieee80211_scan_add_ies(info, &bss->pub, ¤t_ev, end_buf); | |
748 | ||
749 | return current_ev; | |
750 | } | |
751 | ||
752 | ||
753 | static int ieee80211_scan_results(struct cfg80211_registered_device *dev, | |
754 | struct iw_request_info *info, | |
755 | char *buf, size_t len) | |
756 | { | |
757 | char *current_ev = buf; | |
758 | char *end_buf = buf + len; | |
759 | struct cfg80211_internal_bss *bss; | |
760 | ||
761 | spin_lock_bh(&dev->bss_lock); | |
762 | cfg80211_bss_expire(dev); | |
763 | ||
764 | list_for_each_entry(bss, &dev->bss_list, list) { | |
765 | if (buf + len - current_ev <= IW_EV_ADDR_LEN) { | |
766 | spin_unlock_bh(&dev->bss_lock); | |
767 | return -E2BIG; | |
768 | } | |
769 | current_ev = ieee80211_bss(info, bss, | |
770 | current_ev, end_buf); | |
771 | } | |
772 | spin_unlock_bh(&dev->bss_lock); | |
773 | return current_ev - buf; | |
774 | } | |
775 | ||
776 | ||
777 | int cfg80211_wext_giwscan(struct net_device *dev, | |
778 | struct iw_request_info *info, | |
779 | struct iw_point *data, char *extra) | |
780 | { | |
781 | struct cfg80211_registered_device *rdev; | |
782 | int res; | |
783 | ||
784 | if (!netif_running(dev)) | |
785 | return -ENETDOWN; | |
786 | ||
787 | rdev = cfg80211_get_dev_from_ifindex(dev->ifindex); | |
788 | ||
789 | if (IS_ERR(rdev)) | |
790 | return PTR_ERR(rdev); | |
791 | ||
792 | if (rdev->scan_req) { | |
793 | res = -EAGAIN; | |
794 | goto out; | |
795 | } | |
796 | ||
797 | res = ieee80211_scan_results(rdev, info, extra, data->length); | |
798 | data->length = 0; | |
799 | if (res >= 0) { | |
800 | data->length = res; | |
801 | res = 0; | |
802 | } | |
803 | ||
804 | out: | |
805 | cfg80211_put_dev(rdev); | |
806 | return res; | |
807 | } | |
808 | EXPORT_SYMBOL(cfg80211_wext_giwscan); | |
809 | #endif |