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); | |
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 | ||
79420f09 | 119 | if (bssid && compare_ether_addr(a->bssid, bssid)) |
2a519311 JB |
120 | return false; |
121 | ||
79420f09 JB |
122 | if (!ssid) |
123 | return true; | |
124 | ||
2a519311 JB |
125 | ssidie = find_ie(WLAN_EID_SSID, |
126 | a->information_elements, | |
127 | a->len_information_elements); | |
128 | if (!ssidie) | |
129 | return false; | |
130 | if (ssidie[1] != ssid_len) | |
131 | return false; | |
132 | return memcmp(ssidie + 2, ssid, ssid_len) == 0; | |
133 | } | |
134 | ||
135 | static bool is_mesh(struct cfg80211_bss *a, | |
136 | const u8 *meshid, size_t meshidlen, | |
137 | const u8 *meshcfg) | |
138 | { | |
139 | const u8 *ie; | |
140 | ||
141 | if (!is_zero_ether_addr(a->bssid)) | |
142 | return false; | |
143 | ||
144 | ie = find_ie(WLAN_EID_MESH_ID, | |
145 | a->information_elements, | |
146 | a->len_information_elements); | |
147 | if (!ie) | |
148 | return false; | |
149 | if (ie[1] != meshidlen) | |
150 | return false; | |
151 | if (memcmp(ie + 2, meshid, meshidlen)) | |
152 | return false; | |
153 | ||
154 | ie = find_ie(WLAN_EID_MESH_CONFIG, | |
155 | a->information_elements, | |
156 | a->len_information_elements); | |
157 | if (ie[1] != IEEE80211_MESH_CONFIG_LEN) | |
158 | return false; | |
159 | ||
160 | /* | |
161 | * Ignore mesh capability (last two bytes of the IE) when | |
162 | * comparing since that may differ between stations taking | |
163 | * part in the same mesh. | |
164 | */ | |
165 | return memcmp(ie + 2, meshcfg, IEEE80211_MESH_CONFIG_LEN - 2) == 0; | |
166 | } | |
167 | ||
168 | static int cmp_bss(struct cfg80211_bss *a, | |
169 | struct cfg80211_bss *b) | |
170 | { | |
171 | int r; | |
172 | ||
173 | if (a->channel != b->channel) | |
174 | return b->channel->center_freq - a->channel->center_freq; | |
175 | ||
176 | r = memcmp(a->bssid, b->bssid, ETH_ALEN); | |
177 | if (r) | |
178 | return r; | |
179 | ||
180 | if (is_zero_ether_addr(a->bssid)) { | |
181 | r = cmp_ies(WLAN_EID_MESH_ID, | |
182 | a->information_elements, | |
183 | a->len_information_elements, | |
184 | b->information_elements, | |
185 | b->len_information_elements); | |
186 | if (r) | |
187 | return r; | |
188 | return cmp_ies(WLAN_EID_MESH_CONFIG, | |
189 | a->information_elements, | |
190 | a->len_information_elements, | |
191 | b->information_elements, | |
192 | b->len_information_elements); | |
193 | } | |
194 | ||
195 | return cmp_ies(WLAN_EID_SSID, | |
196 | a->information_elements, | |
197 | a->len_information_elements, | |
198 | b->information_elements, | |
199 | b->len_information_elements); | |
200 | } | |
201 | ||
202 | struct cfg80211_bss *cfg80211_get_bss(struct wiphy *wiphy, | |
203 | struct ieee80211_channel *channel, | |
204 | const u8 *bssid, | |
79420f09 JB |
205 | const u8 *ssid, size_t ssid_len, |
206 | u16 capa_mask, u16 capa_val) | |
2a519311 JB |
207 | { |
208 | struct cfg80211_registered_device *dev = wiphy_to_dev(wiphy); | |
209 | struct cfg80211_internal_bss *bss, *res = NULL; | |
210 | ||
211 | spin_lock_bh(&dev->bss_lock); | |
212 | ||
213 | list_for_each_entry(bss, &dev->bss_list, list) { | |
79420f09 JB |
214 | if ((bss->pub.capability & capa_mask) != capa_val) |
215 | continue; | |
2a519311 JB |
216 | if (channel && bss->pub.channel != channel) |
217 | continue; | |
218 | if (is_bss(&bss->pub, bssid, ssid, ssid_len)) { | |
219 | res = bss; | |
220 | kref_get(&res->ref); | |
221 | break; | |
222 | } | |
223 | } | |
224 | ||
225 | spin_unlock_bh(&dev->bss_lock); | |
226 | if (!res) | |
227 | return NULL; | |
228 | return &res->pub; | |
229 | } | |
230 | EXPORT_SYMBOL(cfg80211_get_bss); | |
231 | ||
232 | struct cfg80211_bss *cfg80211_get_mesh(struct wiphy *wiphy, | |
233 | struct ieee80211_channel *channel, | |
234 | const u8 *meshid, size_t meshidlen, | |
235 | const u8 *meshcfg) | |
236 | { | |
237 | struct cfg80211_registered_device *dev = wiphy_to_dev(wiphy); | |
238 | struct cfg80211_internal_bss *bss, *res = NULL; | |
239 | ||
240 | spin_lock_bh(&dev->bss_lock); | |
241 | ||
242 | list_for_each_entry(bss, &dev->bss_list, list) { | |
243 | if (channel && bss->pub.channel != channel) | |
244 | continue; | |
245 | if (is_mesh(&bss->pub, meshid, meshidlen, meshcfg)) { | |
246 | res = bss; | |
247 | kref_get(&res->ref); | |
248 | break; | |
249 | } | |
250 | } | |
251 | ||
252 | spin_unlock_bh(&dev->bss_lock); | |
253 | if (!res) | |
254 | return NULL; | |
255 | return &res->pub; | |
256 | } | |
257 | EXPORT_SYMBOL(cfg80211_get_mesh); | |
258 | ||
259 | ||
260 | static void rb_insert_bss(struct cfg80211_registered_device *dev, | |
261 | struct cfg80211_internal_bss *bss) | |
262 | { | |
263 | struct rb_node **p = &dev->bss_tree.rb_node; | |
264 | struct rb_node *parent = NULL; | |
265 | struct cfg80211_internal_bss *tbss; | |
266 | int cmp; | |
267 | ||
268 | while (*p) { | |
269 | parent = *p; | |
270 | tbss = rb_entry(parent, struct cfg80211_internal_bss, rbn); | |
271 | ||
272 | cmp = cmp_bss(&bss->pub, &tbss->pub); | |
273 | ||
274 | if (WARN_ON(!cmp)) { | |
275 | /* will sort of leak this BSS */ | |
276 | return; | |
277 | } | |
278 | ||
279 | if (cmp < 0) | |
280 | p = &(*p)->rb_left; | |
281 | else | |
282 | p = &(*p)->rb_right; | |
283 | } | |
284 | ||
285 | rb_link_node(&bss->rbn, parent, p); | |
286 | rb_insert_color(&bss->rbn, &dev->bss_tree); | |
287 | } | |
288 | ||
289 | static struct cfg80211_internal_bss * | |
290 | rb_find_bss(struct cfg80211_registered_device *dev, | |
291 | struct cfg80211_internal_bss *res) | |
292 | { | |
293 | struct rb_node *n = dev->bss_tree.rb_node; | |
294 | struct cfg80211_internal_bss *bss; | |
295 | int r; | |
296 | ||
297 | while (n) { | |
298 | bss = rb_entry(n, struct cfg80211_internal_bss, rbn); | |
299 | r = cmp_bss(&res->pub, &bss->pub); | |
300 | ||
301 | if (r == 0) | |
302 | return bss; | |
303 | else if (r < 0) | |
304 | n = n->rb_left; | |
305 | else | |
306 | n = n->rb_right; | |
307 | } | |
308 | ||
309 | return NULL; | |
310 | } | |
311 | ||
312 | static struct cfg80211_internal_bss * | |
313 | cfg80211_bss_update(struct cfg80211_registered_device *dev, | |
314 | struct cfg80211_internal_bss *res, | |
315 | bool overwrite) | |
316 | { | |
317 | struct cfg80211_internal_bss *found = NULL; | |
318 | const u8 *meshid, *meshcfg; | |
319 | ||
320 | /* | |
321 | * The reference to "res" is donated to this function. | |
322 | */ | |
323 | ||
324 | if (WARN_ON(!res->pub.channel)) { | |
325 | kref_put(&res->ref, bss_release); | |
326 | return NULL; | |
327 | } | |
328 | ||
329 | res->ts = jiffies; | |
330 | ||
331 | if (is_zero_ether_addr(res->pub.bssid)) { | |
332 | /* must be mesh, verify */ | |
333 | meshid = find_ie(WLAN_EID_MESH_ID, res->pub.information_elements, | |
334 | res->pub.len_information_elements); | |
335 | meshcfg = find_ie(WLAN_EID_MESH_CONFIG, | |
336 | res->pub.information_elements, | |
337 | res->pub.len_information_elements); | |
338 | if (!meshid || !meshcfg || | |
339 | meshcfg[1] != IEEE80211_MESH_CONFIG_LEN) { | |
340 | /* bogus mesh */ | |
341 | kref_put(&res->ref, bss_release); | |
342 | return NULL; | |
343 | } | |
344 | } | |
345 | ||
346 | spin_lock_bh(&dev->bss_lock); | |
347 | ||
348 | found = rb_find_bss(dev, res); | |
349 | ||
350 | if (found && overwrite) { | |
351 | list_replace(&found->list, &res->list); | |
352 | rb_replace_node(&found->rbn, &res->rbn, | |
353 | &dev->bss_tree); | |
354 | kref_put(&found->ref, bss_release); | |
355 | found = res; | |
356 | } else if (found) { | |
357 | kref_get(&found->ref); | |
358 | found->pub.beacon_interval = res->pub.beacon_interval; | |
359 | found->pub.tsf = res->pub.tsf; | |
360 | found->pub.signal = res->pub.signal; | |
361 | found->pub.signal_type = res->pub.signal_type; | |
362 | found->pub.capability = res->pub.capability; | |
363 | found->ts = res->ts; | |
364 | kref_put(&res->ref, bss_release); | |
365 | } else { | |
366 | /* this "consumes" the reference */ | |
367 | list_add_tail(&res->list, &dev->bss_list); | |
368 | rb_insert_bss(dev, res); | |
369 | found = res; | |
370 | } | |
371 | ||
372 | dev->bss_generation++; | |
373 | spin_unlock_bh(&dev->bss_lock); | |
374 | ||
375 | kref_get(&found->ref); | |
376 | return found; | |
377 | } | |
378 | ||
379 | struct cfg80211_bss * | |
380 | cfg80211_inform_bss_frame(struct wiphy *wiphy, | |
381 | struct ieee80211_channel *channel, | |
382 | struct ieee80211_mgmt *mgmt, size_t len, | |
383 | s32 signal, enum cfg80211_signal_type sigtype, | |
384 | gfp_t gfp) | |
385 | { | |
386 | struct cfg80211_internal_bss *res; | |
387 | size_t ielen = len - offsetof(struct ieee80211_mgmt, | |
388 | u.probe_resp.variable); | |
389 | bool overwrite; | |
390 | size_t privsz = wiphy->bss_priv_size; | |
391 | ||
392 | if (WARN_ON(sigtype == NL80211_BSS_SIGNAL_UNSPEC && | |
393 | (signal < 0 || signal > 100))) | |
394 | return NULL; | |
395 | ||
396 | if (WARN_ON(!mgmt || !wiphy || | |
397 | len < offsetof(struct ieee80211_mgmt, u.probe_resp.variable))) | |
398 | return NULL; | |
399 | ||
400 | res = kzalloc(sizeof(*res) + privsz + ielen, gfp); | |
401 | if (!res) | |
402 | return NULL; | |
403 | ||
404 | memcpy(res->pub.bssid, mgmt->bssid, ETH_ALEN); | |
405 | res->pub.channel = channel; | |
406 | res->pub.signal_type = sigtype; | |
407 | res->pub.signal = signal; | |
408 | res->pub.tsf = le64_to_cpu(mgmt->u.probe_resp.timestamp); | |
409 | res->pub.beacon_interval = le16_to_cpu(mgmt->u.probe_resp.beacon_int); | |
410 | res->pub.capability = le16_to_cpu(mgmt->u.probe_resp.capab_info); | |
411 | /* point to after the private area */ | |
412 | res->pub.information_elements = (u8 *)res + sizeof(*res) + privsz; | |
413 | memcpy(res->pub.information_elements, mgmt->u.probe_resp.variable, ielen); | |
414 | res->pub.len_information_elements = ielen; | |
415 | ||
416 | kref_init(&res->ref); | |
417 | ||
418 | overwrite = ieee80211_is_probe_resp(mgmt->frame_control); | |
419 | ||
420 | res = cfg80211_bss_update(wiphy_to_dev(wiphy), res, overwrite); | |
421 | if (!res) | |
422 | return NULL; | |
423 | ||
424 | /* cfg80211_bss_update gives us a referenced result */ | |
425 | return &res->pub; | |
426 | } | |
427 | EXPORT_SYMBOL(cfg80211_inform_bss_frame); | |
428 | ||
429 | void cfg80211_put_bss(struct cfg80211_bss *pub) | |
430 | { | |
431 | struct cfg80211_internal_bss *bss; | |
432 | ||
433 | if (!pub) | |
434 | return; | |
435 | ||
436 | bss = container_of(pub, struct cfg80211_internal_bss, pub); | |
437 | kref_put(&bss->ref, bss_release); | |
438 | } | |
439 | EXPORT_SYMBOL(cfg80211_put_bss); | |
440 | ||
d491af19 JB |
441 | void cfg80211_unlink_bss(struct wiphy *wiphy, struct cfg80211_bss *pub) |
442 | { | |
443 | struct cfg80211_registered_device *dev = wiphy_to_dev(wiphy); | |
444 | struct cfg80211_internal_bss *bss; | |
445 | ||
446 | if (WARN_ON(!pub)) | |
447 | return; | |
448 | ||
449 | bss = container_of(pub, struct cfg80211_internal_bss, pub); | |
450 | ||
451 | spin_lock_bh(&dev->bss_lock); | |
452 | ||
453 | list_del(&bss->list); | |
454 | rb_erase(&bss->rbn, &dev->bss_tree); | |
455 | ||
456 | spin_unlock_bh(&dev->bss_lock); | |
457 | ||
458 | kref_put(&bss->ref, bss_release); | |
459 | } | |
460 | EXPORT_SYMBOL(cfg80211_unlink_bss); | |
461 | ||
2a519311 JB |
462 | #ifdef CONFIG_WIRELESS_EXT |
463 | int cfg80211_wext_siwscan(struct net_device *dev, | |
464 | struct iw_request_info *info, | |
465 | union iwreq_data *wrqu, char *extra) | |
466 | { | |
467 | struct cfg80211_registered_device *rdev; | |
468 | struct wiphy *wiphy; | |
469 | struct iw_scan_req *wreq = NULL; | |
470 | struct cfg80211_scan_request *creq; | |
471 | int i, err, n_channels = 0; | |
472 | enum ieee80211_band band; | |
473 | ||
474 | if (!netif_running(dev)) | |
475 | return -ENETDOWN; | |
476 | ||
477 | rdev = cfg80211_get_dev_from_ifindex(dev->ifindex); | |
478 | ||
479 | if (IS_ERR(rdev)) | |
480 | return PTR_ERR(rdev); | |
481 | ||
482 | if (rdev->scan_req) { | |
483 | err = -EBUSY; | |
484 | goto out; | |
485 | } | |
486 | ||
487 | wiphy = &rdev->wiphy; | |
488 | ||
489 | for (band = 0; band < IEEE80211_NUM_BANDS; band++) | |
490 | if (wiphy->bands[band]) | |
491 | n_channels += wiphy->bands[band]->n_channels; | |
492 | ||
493 | creq = kzalloc(sizeof(*creq) + sizeof(struct cfg80211_ssid) + | |
494 | n_channels * sizeof(void *), | |
495 | GFP_ATOMIC); | |
496 | if (!creq) { | |
497 | err = -ENOMEM; | |
498 | goto out; | |
499 | } | |
500 | ||
501 | creq->wiphy = wiphy; | |
502 | creq->ifidx = dev->ifindex; | |
503 | creq->ssids = (void *)(creq + 1); | |
504 | creq->channels = (void *)(creq->ssids + 1); | |
505 | creq->n_channels = n_channels; | |
506 | creq->n_ssids = 1; | |
507 | ||
508 | /* all channels */ | |
509 | i = 0; | |
510 | for (band = 0; band < IEEE80211_NUM_BANDS; band++) { | |
511 | int j; | |
512 | if (!wiphy->bands[band]) | |
513 | continue; | |
514 | for (j = 0; j < wiphy->bands[band]->n_channels; j++) { | |
515 | creq->channels[i] = &wiphy->bands[band]->channels[j]; | |
516 | i++; | |
517 | } | |
518 | } | |
519 | ||
520 | /* translate scan request */ | |
521 | if (wrqu->data.length == sizeof(struct iw_scan_req)) { | |
522 | wreq = (struct iw_scan_req *)extra; | |
523 | ||
524 | if (wrqu->data.flags & IW_SCAN_THIS_ESSID) { | |
525 | if (wreq->essid_len > IEEE80211_MAX_SSID_LEN) | |
526 | return -EINVAL; | |
527 | memcpy(creq->ssids[0].ssid, wreq->essid, wreq->essid_len); | |
528 | creq->ssids[0].ssid_len = wreq->essid_len; | |
529 | } | |
530 | if (wreq->scan_type == IW_SCAN_TYPE_PASSIVE) | |
531 | creq->n_ssids = 0; | |
532 | } | |
533 | ||
534 | rdev->scan_req = creq; | |
535 | err = rdev->ops->scan(wiphy, dev, creq); | |
536 | if (err) { | |
537 | rdev->scan_req = NULL; | |
538 | kfree(creq); | |
539 | } | |
540 | out: | |
541 | cfg80211_put_dev(rdev); | |
542 | return err; | |
543 | } | |
544 | EXPORT_SYMBOL(cfg80211_wext_siwscan); | |
545 | ||
546 | static void ieee80211_scan_add_ies(struct iw_request_info *info, | |
547 | struct cfg80211_bss *bss, | |
548 | char **current_ev, char *end_buf) | |
549 | { | |
550 | u8 *pos, *end, *next; | |
551 | struct iw_event iwe; | |
552 | ||
553 | if (!bss->information_elements || | |
554 | !bss->len_information_elements) | |
555 | return; | |
556 | ||
557 | /* | |
558 | * If needed, fragment the IEs buffer (at IE boundaries) into short | |
559 | * enough fragments to fit into IW_GENERIC_IE_MAX octet messages. | |
560 | */ | |
561 | pos = bss->information_elements; | |
562 | end = pos + bss->len_information_elements; | |
563 | ||
564 | while (end - pos > IW_GENERIC_IE_MAX) { | |
565 | next = pos + 2 + pos[1]; | |
566 | while (next + 2 + next[1] - pos < IW_GENERIC_IE_MAX) | |
567 | next = next + 2 + next[1]; | |
568 | ||
569 | memset(&iwe, 0, sizeof(iwe)); | |
570 | iwe.cmd = IWEVGENIE; | |
571 | iwe.u.data.length = next - pos; | |
572 | *current_ev = iwe_stream_add_point(info, *current_ev, | |
573 | end_buf, &iwe, pos); | |
574 | ||
575 | pos = next; | |
576 | } | |
577 | ||
578 | if (end > pos) { | |
579 | memset(&iwe, 0, sizeof(iwe)); | |
580 | iwe.cmd = IWEVGENIE; | |
581 | iwe.u.data.length = end - pos; | |
582 | *current_ev = iwe_stream_add_point(info, *current_ev, | |
583 | end_buf, &iwe, pos); | |
584 | } | |
585 | } | |
586 | ||
587 | ||
588 | static char * | |
589 | ieee80211_bss(struct iw_request_info *info, | |
590 | struct cfg80211_internal_bss *bss, | |
591 | char *current_ev, char *end_buf) | |
592 | { | |
593 | struct iw_event iwe; | |
594 | u8 *buf, *cfg, *p; | |
595 | u8 *ie = bss->pub.information_elements; | |
596 | int rem = bss->pub.len_information_elements, i; | |
597 | bool ismesh = false; | |
598 | ||
599 | memset(&iwe, 0, sizeof(iwe)); | |
600 | iwe.cmd = SIOCGIWAP; | |
601 | iwe.u.ap_addr.sa_family = ARPHRD_ETHER; | |
602 | memcpy(iwe.u.ap_addr.sa_data, bss->pub.bssid, ETH_ALEN); | |
603 | current_ev = iwe_stream_add_event(info, current_ev, end_buf, &iwe, | |
604 | IW_EV_ADDR_LEN); | |
605 | ||
606 | memset(&iwe, 0, sizeof(iwe)); | |
607 | iwe.cmd = SIOCGIWFREQ; | |
608 | iwe.u.freq.m = ieee80211_frequency_to_channel(bss->pub.channel->center_freq); | |
609 | iwe.u.freq.e = 0; | |
610 | current_ev = iwe_stream_add_event(info, current_ev, end_buf, &iwe, | |
611 | IW_EV_FREQ_LEN); | |
612 | ||
613 | memset(&iwe, 0, sizeof(iwe)); | |
614 | iwe.cmd = SIOCGIWFREQ; | |
615 | iwe.u.freq.m = bss->pub.channel->center_freq; | |
616 | iwe.u.freq.e = 6; | |
617 | current_ev = iwe_stream_add_event(info, current_ev, end_buf, &iwe, | |
618 | IW_EV_FREQ_LEN); | |
619 | ||
620 | if (bss->pub.signal_type != CFG80211_SIGNAL_TYPE_NONE) { | |
621 | memset(&iwe, 0, sizeof(iwe)); | |
622 | iwe.cmd = IWEVQUAL; | |
623 | iwe.u.qual.updated = IW_QUAL_LEVEL_UPDATED | | |
624 | IW_QUAL_NOISE_INVALID | | |
625 | IW_QUAL_QUAL_INVALID; | |
626 | switch (bss->pub.signal_type) { | |
627 | case CFG80211_SIGNAL_TYPE_MBM: | |
628 | iwe.u.qual.level = bss->pub.signal / 100; | |
629 | iwe.u.qual.updated |= IW_QUAL_DBM; | |
630 | break; | |
631 | case CFG80211_SIGNAL_TYPE_UNSPEC: | |
632 | iwe.u.qual.level = bss->pub.signal; | |
633 | break; | |
634 | default: | |
635 | /* not reached */ | |
636 | break; | |
637 | } | |
638 | current_ev = iwe_stream_add_event(info, current_ev, end_buf, | |
639 | &iwe, IW_EV_QUAL_LEN); | |
640 | } | |
641 | ||
642 | memset(&iwe, 0, sizeof(iwe)); | |
643 | iwe.cmd = SIOCGIWENCODE; | |
644 | if (bss->pub.capability & WLAN_CAPABILITY_PRIVACY) | |
645 | iwe.u.data.flags = IW_ENCODE_ENABLED | IW_ENCODE_NOKEY; | |
646 | else | |
647 | iwe.u.data.flags = IW_ENCODE_DISABLED; | |
648 | iwe.u.data.length = 0; | |
649 | current_ev = iwe_stream_add_point(info, current_ev, end_buf, | |
650 | &iwe, ""); | |
651 | ||
652 | while (rem >= 2) { | |
653 | /* invalid data */ | |
654 | if (ie[1] > rem - 2) | |
655 | break; | |
656 | ||
657 | switch (ie[0]) { | |
658 | case WLAN_EID_SSID: | |
659 | memset(&iwe, 0, sizeof(iwe)); | |
660 | iwe.cmd = SIOCGIWESSID; | |
661 | iwe.u.data.length = ie[1]; | |
662 | iwe.u.data.flags = 1; | |
663 | current_ev = iwe_stream_add_point(info, current_ev, end_buf, | |
664 | &iwe, ie + 2); | |
665 | break; | |
666 | case WLAN_EID_MESH_ID: | |
667 | memset(&iwe, 0, sizeof(iwe)); | |
668 | iwe.cmd = SIOCGIWESSID; | |
669 | iwe.u.data.length = ie[1]; | |
670 | iwe.u.data.flags = 1; | |
671 | current_ev = iwe_stream_add_point(info, current_ev, end_buf, | |
672 | &iwe, ie + 2); | |
673 | break; | |
674 | case WLAN_EID_MESH_CONFIG: | |
675 | ismesh = true; | |
676 | if (ie[1] != IEEE80211_MESH_CONFIG_LEN) | |
677 | break; | |
678 | buf = kmalloc(50, GFP_ATOMIC); | |
679 | if (!buf) | |
680 | break; | |
681 | cfg = ie + 2; | |
682 | memset(&iwe, 0, sizeof(iwe)); | |
683 | iwe.cmd = IWEVCUSTOM; | |
684 | sprintf(buf, "Mesh network (version %d)", cfg[0]); | |
685 | iwe.u.data.length = strlen(buf); | |
686 | current_ev = iwe_stream_add_point(info, current_ev, | |
687 | end_buf, | |
688 | &iwe, buf); | |
689 | sprintf(buf, "Path Selection Protocol ID: " | |
690 | "0x%02X%02X%02X%02X", cfg[1], cfg[2], cfg[3], | |
691 | cfg[4]); | |
692 | iwe.u.data.length = strlen(buf); | |
693 | current_ev = iwe_stream_add_point(info, current_ev, | |
694 | end_buf, | |
695 | &iwe, buf); | |
696 | sprintf(buf, "Path Selection Metric ID: " | |
697 | "0x%02X%02X%02X%02X", cfg[5], cfg[6], cfg[7], | |
698 | cfg[8]); | |
699 | iwe.u.data.length = strlen(buf); | |
700 | current_ev = iwe_stream_add_point(info, current_ev, | |
701 | end_buf, | |
702 | &iwe, buf); | |
703 | sprintf(buf, "Congestion Control Mode ID: " | |
704 | "0x%02X%02X%02X%02X", cfg[9], cfg[10], | |
705 | cfg[11], cfg[12]); | |
706 | iwe.u.data.length = strlen(buf); | |
707 | current_ev = iwe_stream_add_point(info, current_ev, | |
708 | end_buf, | |
709 | &iwe, buf); | |
710 | sprintf(buf, "Channel Precedence: " | |
711 | "0x%02X%02X%02X%02X", cfg[13], cfg[14], | |
712 | cfg[15], cfg[16]); | |
713 | iwe.u.data.length = strlen(buf); | |
714 | current_ev = iwe_stream_add_point(info, current_ev, | |
715 | end_buf, | |
716 | &iwe, buf); | |
717 | kfree(buf); | |
718 | break; | |
719 | case WLAN_EID_SUPP_RATES: | |
720 | case WLAN_EID_EXT_SUPP_RATES: | |
721 | /* display all supported rates in readable format */ | |
722 | p = current_ev + iwe_stream_lcp_len(info); | |
723 | ||
724 | memset(&iwe, 0, sizeof(iwe)); | |
725 | iwe.cmd = SIOCGIWRATE; | |
726 | /* Those two flags are ignored... */ | |
727 | iwe.u.bitrate.fixed = iwe.u.bitrate.disabled = 0; | |
728 | ||
729 | for (i = 0; i < ie[1]; i++) { | |
730 | iwe.u.bitrate.value = | |
731 | ((ie[i + 2] & 0x7f) * 500000); | |
732 | p = iwe_stream_add_value(info, current_ev, p, | |
733 | end_buf, &iwe, IW_EV_PARAM_LEN); | |
734 | } | |
735 | current_ev = p; | |
736 | break; | |
737 | } | |
738 | rem -= ie[1] + 2; | |
739 | ie += ie[1] + 2; | |
740 | } | |
741 | ||
742 | if (bss->pub.capability & (WLAN_CAPABILITY_ESS | WLAN_CAPABILITY_IBSS) | |
743 | || ismesh) { | |
744 | memset(&iwe, 0, sizeof(iwe)); | |
745 | iwe.cmd = SIOCGIWMODE; | |
746 | if (ismesh) | |
747 | iwe.u.mode = IW_MODE_MESH; | |
748 | else if (bss->pub.capability & WLAN_CAPABILITY_ESS) | |
749 | iwe.u.mode = IW_MODE_MASTER; | |
750 | else | |
751 | iwe.u.mode = IW_MODE_ADHOC; | |
752 | current_ev = iwe_stream_add_event(info, current_ev, end_buf, | |
753 | &iwe, IW_EV_UINT_LEN); | |
754 | } | |
755 | ||
756 | buf = kmalloc(30, GFP_ATOMIC); | |
757 | if (buf) { | |
758 | memset(&iwe, 0, sizeof(iwe)); | |
759 | iwe.cmd = IWEVCUSTOM; | |
760 | sprintf(buf, "tsf=%016llx", (unsigned long long)(bss->pub.tsf)); | |
761 | iwe.u.data.length = strlen(buf); | |
762 | current_ev = iwe_stream_add_point(info, current_ev, end_buf, | |
763 | &iwe, buf); | |
764 | memset(&iwe, 0, sizeof(iwe)); | |
765 | iwe.cmd = IWEVCUSTOM; | |
766 | sprintf(buf, " Last beacon: %dms ago", | |
767 | jiffies_to_msecs(jiffies - bss->ts)); | |
768 | iwe.u.data.length = strlen(buf); | |
769 | current_ev = iwe_stream_add_point(info, current_ev, | |
770 | end_buf, &iwe, buf); | |
771 | kfree(buf); | |
772 | } | |
773 | ||
774 | ieee80211_scan_add_ies(info, &bss->pub, ¤t_ev, end_buf); | |
775 | ||
776 | return current_ev; | |
777 | } | |
778 | ||
779 | ||
780 | static int ieee80211_scan_results(struct cfg80211_registered_device *dev, | |
781 | struct iw_request_info *info, | |
782 | char *buf, size_t len) | |
783 | { | |
784 | char *current_ev = buf; | |
785 | char *end_buf = buf + len; | |
786 | struct cfg80211_internal_bss *bss; | |
787 | ||
788 | spin_lock_bh(&dev->bss_lock); | |
789 | cfg80211_bss_expire(dev); | |
790 | ||
791 | list_for_each_entry(bss, &dev->bss_list, list) { | |
792 | if (buf + len - current_ev <= IW_EV_ADDR_LEN) { | |
793 | spin_unlock_bh(&dev->bss_lock); | |
794 | return -E2BIG; | |
795 | } | |
796 | current_ev = ieee80211_bss(info, bss, | |
797 | current_ev, end_buf); | |
798 | } | |
799 | spin_unlock_bh(&dev->bss_lock); | |
800 | return current_ev - buf; | |
801 | } | |
802 | ||
803 | ||
804 | int cfg80211_wext_giwscan(struct net_device *dev, | |
805 | struct iw_request_info *info, | |
806 | struct iw_point *data, char *extra) | |
807 | { | |
808 | struct cfg80211_registered_device *rdev; | |
809 | int res; | |
810 | ||
811 | if (!netif_running(dev)) | |
812 | return -ENETDOWN; | |
813 | ||
814 | rdev = cfg80211_get_dev_from_ifindex(dev->ifindex); | |
815 | ||
816 | if (IS_ERR(rdev)) | |
817 | return PTR_ERR(rdev); | |
818 | ||
819 | if (rdev->scan_req) { | |
820 | res = -EAGAIN; | |
821 | goto out; | |
822 | } | |
823 | ||
824 | res = ieee80211_scan_results(rdev, info, extra, data->length); | |
825 | data->length = 0; | |
826 | if (res >= 0) { | |
827 | data->length = res; | |
828 | res = 0; | |
829 | } | |
830 | ||
831 | out: | |
832 | cfg80211_put_dev(rdev); | |
833 | return res; | |
834 | } | |
835 | EXPORT_SYMBOL(cfg80211_wext_giwscan); | |
836 | #endif |