Commit | Line | Data |
---|---|---|
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 | ||
cb3a8eec DW |
64 | /* must hold dev->bss_lock! */ |
65 | void cfg80211_bss_age(struct cfg80211_registered_device *dev, | |
66 | unsigned long age_secs) | |
67 | { | |
68 | struct cfg80211_internal_bss *bss; | |
69 | unsigned long age_jiffies = msecs_to_jiffies(age_secs * MSEC_PER_SEC); | |
70 | ||
71 | list_for_each_entry(bss, &dev->bss_list, list) { | |
72 | bss->ts -= age_jiffies; | |
73 | } | |
74 | } | |
75 | ||
2a519311 JB |
76 | /* must hold dev->bss_lock! */ |
77 | void cfg80211_bss_expire(struct cfg80211_registered_device *dev) | |
78 | { | |
79 | struct cfg80211_internal_bss *bss, *tmp; | |
80 | bool expired = false; | |
81 | ||
82 | list_for_each_entry_safe(bss, tmp, &dev->bss_list, list) { | |
83 | if (!time_after(jiffies, bss->ts + IEEE80211_SCAN_RESULT_EXPIRE)) | |
84 | continue; | |
85 | list_del(&bss->list); | |
86 | rb_erase(&bss->rbn, &dev->bss_tree); | |
87 | kref_put(&bss->ref, bss_release); | |
88 | expired = true; | |
89 | } | |
90 | ||
91 | if (expired) | |
92 | dev->bss_generation++; | |
93 | } | |
94 | ||
95 | static u8 *find_ie(u8 num, u8 *ies, size_t len) | |
96 | { | |
97 | while (len > 2 && ies[0] != num) { | |
98 | len -= ies[1] + 2; | |
99 | ies += ies[1] + 2; | |
100 | } | |
101 | if (len < 2) | |
102 | return NULL; | |
103 | if (len < 2 + ies[1]) | |
104 | return NULL; | |
105 | return ies; | |
106 | } | |
107 | ||
108 | static int cmp_ies(u8 num, u8 *ies1, size_t len1, u8 *ies2, size_t len2) | |
109 | { | |
110 | const u8 *ie1 = find_ie(num, ies1, len1); | |
111 | const u8 *ie2 = find_ie(num, ies2, len2); | |
112 | int r; | |
113 | ||
114 | if (!ie1 && !ie2) | |
115 | return 0; | |
116 | if (!ie1) | |
117 | return -1; | |
118 | ||
119 | r = memcmp(ie1 + 2, ie2 + 2, min(ie1[1], ie2[1])); | |
120 | if (r == 0 && ie1[1] != ie2[1]) | |
121 | return ie2[1] - ie1[1]; | |
122 | return r; | |
123 | } | |
124 | ||
125 | static bool is_bss(struct cfg80211_bss *a, | |
126 | const u8 *bssid, | |
127 | const u8 *ssid, size_t ssid_len) | |
128 | { | |
129 | const u8 *ssidie; | |
130 | ||
79420f09 | 131 | if (bssid && compare_ether_addr(a->bssid, bssid)) |
2a519311 JB |
132 | return false; |
133 | ||
79420f09 JB |
134 | if (!ssid) |
135 | return true; | |
136 | ||
2a519311 JB |
137 | ssidie = find_ie(WLAN_EID_SSID, |
138 | a->information_elements, | |
139 | a->len_information_elements); | |
140 | if (!ssidie) | |
141 | return false; | |
142 | if (ssidie[1] != ssid_len) | |
143 | return false; | |
144 | return memcmp(ssidie + 2, ssid, ssid_len) == 0; | |
145 | } | |
146 | ||
147 | static bool is_mesh(struct cfg80211_bss *a, | |
148 | const u8 *meshid, size_t meshidlen, | |
149 | const u8 *meshcfg) | |
150 | { | |
151 | const u8 *ie; | |
152 | ||
153 | if (!is_zero_ether_addr(a->bssid)) | |
154 | return false; | |
155 | ||
156 | ie = find_ie(WLAN_EID_MESH_ID, | |
157 | a->information_elements, | |
158 | a->len_information_elements); | |
159 | if (!ie) | |
160 | return false; | |
161 | if (ie[1] != meshidlen) | |
162 | return false; | |
163 | if (memcmp(ie + 2, meshid, meshidlen)) | |
164 | return false; | |
165 | ||
166 | ie = find_ie(WLAN_EID_MESH_CONFIG, | |
167 | a->information_elements, | |
168 | a->len_information_elements); | |
169 | if (ie[1] != IEEE80211_MESH_CONFIG_LEN) | |
170 | return false; | |
171 | ||
172 | /* | |
173 | * Ignore mesh capability (last two bytes of the IE) when | |
174 | * comparing since that may differ between stations taking | |
175 | * part in the same mesh. | |
176 | */ | |
177 | return memcmp(ie + 2, meshcfg, IEEE80211_MESH_CONFIG_LEN - 2) == 0; | |
178 | } | |
179 | ||
180 | static int cmp_bss(struct cfg80211_bss *a, | |
181 | struct cfg80211_bss *b) | |
182 | { | |
183 | int r; | |
184 | ||
185 | if (a->channel != b->channel) | |
186 | return b->channel->center_freq - a->channel->center_freq; | |
187 | ||
188 | r = memcmp(a->bssid, b->bssid, ETH_ALEN); | |
189 | if (r) | |
190 | return r; | |
191 | ||
192 | if (is_zero_ether_addr(a->bssid)) { | |
193 | r = cmp_ies(WLAN_EID_MESH_ID, | |
194 | a->information_elements, | |
195 | a->len_information_elements, | |
196 | b->information_elements, | |
197 | b->len_information_elements); | |
198 | if (r) | |
199 | return r; | |
200 | return cmp_ies(WLAN_EID_MESH_CONFIG, | |
201 | a->information_elements, | |
202 | a->len_information_elements, | |
203 | b->information_elements, | |
204 | b->len_information_elements); | |
205 | } | |
206 | ||
207 | return cmp_ies(WLAN_EID_SSID, | |
208 | a->information_elements, | |
209 | a->len_information_elements, | |
210 | b->information_elements, | |
211 | b->len_information_elements); | |
212 | } | |
213 | ||
214 | struct cfg80211_bss *cfg80211_get_bss(struct wiphy *wiphy, | |
215 | struct ieee80211_channel *channel, | |
216 | const u8 *bssid, | |
79420f09 JB |
217 | const u8 *ssid, size_t ssid_len, |
218 | u16 capa_mask, u16 capa_val) | |
2a519311 JB |
219 | { |
220 | struct cfg80211_registered_device *dev = wiphy_to_dev(wiphy); | |
221 | struct cfg80211_internal_bss *bss, *res = NULL; | |
222 | ||
223 | spin_lock_bh(&dev->bss_lock); | |
224 | ||
225 | list_for_each_entry(bss, &dev->bss_list, list) { | |
79420f09 JB |
226 | if ((bss->pub.capability & capa_mask) != capa_val) |
227 | continue; | |
2a519311 JB |
228 | if (channel && bss->pub.channel != channel) |
229 | continue; | |
230 | if (is_bss(&bss->pub, bssid, ssid, ssid_len)) { | |
231 | res = bss; | |
232 | kref_get(&res->ref); | |
233 | break; | |
234 | } | |
235 | } | |
236 | ||
237 | spin_unlock_bh(&dev->bss_lock); | |
238 | if (!res) | |
239 | return NULL; | |
240 | return &res->pub; | |
241 | } | |
242 | EXPORT_SYMBOL(cfg80211_get_bss); | |
243 | ||
244 | struct cfg80211_bss *cfg80211_get_mesh(struct wiphy *wiphy, | |
245 | struct ieee80211_channel *channel, | |
246 | const u8 *meshid, size_t meshidlen, | |
247 | const u8 *meshcfg) | |
248 | { | |
249 | struct cfg80211_registered_device *dev = wiphy_to_dev(wiphy); | |
250 | struct cfg80211_internal_bss *bss, *res = NULL; | |
251 | ||
252 | spin_lock_bh(&dev->bss_lock); | |
253 | ||
254 | list_for_each_entry(bss, &dev->bss_list, list) { | |
255 | if (channel && bss->pub.channel != channel) | |
256 | continue; | |
257 | if (is_mesh(&bss->pub, meshid, meshidlen, meshcfg)) { | |
258 | res = bss; | |
259 | kref_get(&res->ref); | |
260 | break; | |
261 | } | |
262 | } | |
263 | ||
264 | spin_unlock_bh(&dev->bss_lock); | |
265 | if (!res) | |
266 | return NULL; | |
267 | return &res->pub; | |
268 | } | |
269 | EXPORT_SYMBOL(cfg80211_get_mesh); | |
270 | ||
271 | ||
272 | static void rb_insert_bss(struct cfg80211_registered_device *dev, | |
273 | struct cfg80211_internal_bss *bss) | |
274 | { | |
275 | struct rb_node **p = &dev->bss_tree.rb_node; | |
276 | struct rb_node *parent = NULL; | |
277 | struct cfg80211_internal_bss *tbss; | |
278 | int cmp; | |
279 | ||
280 | while (*p) { | |
281 | parent = *p; | |
282 | tbss = rb_entry(parent, struct cfg80211_internal_bss, rbn); | |
283 | ||
284 | cmp = cmp_bss(&bss->pub, &tbss->pub); | |
285 | ||
286 | if (WARN_ON(!cmp)) { | |
287 | /* will sort of leak this BSS */ | |
288 | return; | |
289 | } | |
290 | ||
291 | if (cmp < 0) | |
292 | p = &(*p)->rb_left; | |
293 | else | |
294 | p = &(*p)->rb_right; | |
295 | } | |
296 | ||
297 | rb_link_node(&bss->rbn, parent, p); | |
298 | rb_insert_color(&bss->rbn, &dev->bss_tree); | |
299 | } | |
300 | ||
301 | static struct cfg80211_internal_bss * | |
302 | rb_find_bss(struct cfg80211_registered_device *dev, | |
303 | struct cfg80211_internal_bss *res) | |
304 | { | |
305 | struct rb_node *n = dev->bss_tree.rb_node; | |
306 | struct cfg80211_internal_bss *bss; | |
307 | int r; | |
308 | ||
309 | while (n) { | |
310 | bss = rb_entry(n, struct cfg80211_internal_bss, rbn); | |
311 | r = cmp_bss(&res->pub, &bss->pub); | |
312 | ||
313 | if (r == 0) | |
314 | return bss; | |
315 | else if (r < 0) | |
316 | n = n->rb_left; | |
317 | else | |
318 | n = n->rb_right; | |
319 | } | |
320 | ||
321 | return NULL; | |
322 | } | |
323 | ||
324 | static struct cfg80211_internal_bss * | |
325 | cfg80211_bss_update(struct cfg80211_registered_device *dev, | |
326 | struct cfg80211_internal_bss *res, | |
327 | bool overwrite) | |
328 | { | |
329 | struct cfg80211_internal_bss *found = NULL; | |
330 | const u8 *meshid, *meshcfg; | |
331 | ||
332 | /* | |
333 | * The reference to "res" is donated to this function. | |
334 | */ | |
335 | ||
336 | if (WARN_ON(!res->pub.channel)) { | |
337 | kref_put(&res->ref, bss_release); | |
338 | return NULL; | |
339 | } | |
340 | ||
341 | res->ts = jiffies; | |
342 | ||
343 | if (is_zero_ether_addr(res->pub.bssid)) { | |
344 | /* must be mesh, verify */ | |
345 | meshid = find_ie(WLAN_EID_MESH_ID, res->pub.information_elements, | |
346 | res->pub.len_information_elements); | |
347 | meshcfg = find_ie(WLAN_EID_MESH_CONFIG, | |
348 | res->pub.information_elements, | |
349 | res->pub.len_information_elements); | |
350 | if (!meshid || !meshcfg || | |
351 | meshcfg[1] != IEEE80211_MESH_CONFIG_LEN) { | |
352 | /* bogus mesh */ | |
353 | kref_put(&res->ref, bss_release); | |
354 | return NULL; | |
355 | } | |
356 | } | |
357 | ||
358 | spin_lock_bh(&dev->bss_lock); | |
359 | ||
360 | found = rb_find_bss(dev, res); | |
361 | ||
362 | if (found && overwrite) { | |
363 | list_replace(&found->list, &res->list); | |
364 | rb_replace_node(&found->rbn, &res->rbn, | |
365 | &dev->bss_tree); | |
366 | kref_put(&found->ref, bss_release); | |
367 | found = res; | |
368 | } else if (found) { | |
369 | kref_get(&found->ref); | |
370 | found->pub.beacon_interval = res->pub.beacon_interval; | |
371 | found->pub.tsf = res->pub.tsf; | |
372 | found->pub.signal = res->pub.signal; | |
2a519311 JB |
373 | found->pub.capability = res->pub.capability; |
374 | found->ts = res->ts; | |
375 | kref_put(&res->ref, bss_release); | |
376 | } else { | |
377 | /* this "consumes" the reference */ | |
378 | list_add_tail(&res->list, &dev->bss_list); | |
379 | rb_insert_bss(dev, res); | |
380 | found = res; | |
381 | } | |
382 | ||
383 | dev->bss_generation++; | |
384 | spin_unlock_bh(&dev->bss_lock); | |
385 | ||
386 | kref_get(&found->ref); | |
387 | return found; | |
388 | } | |
389 | ||
390 | struct cfg80211_bss * | |
391 | cfg80211_inform_bss_frame(struct wiphy *wiphy, | |
392 | struct ieee80211_channel *channel, | |
393 | struct ieee80211_mgmt *mgmt, size_t len, | |
77965c97 | 394 | s32 signal, gfp_t gfp) |
2a519311 JB |
395 | { |
396 | struct cfg80211_internal_bss *res; | |
397 | size_t ielen = len - offsetof(struct ieee80211_mgmt, | |
398 | u.probe_resp.variable); | |
399 | bool overwrite; | |
400 | size_t privsz = wiphy->bss_priv_size; | |
401 | ||
77965c97 | 402 | if (WARN_ON(wiphy->signal_type == NL80211_BSS_SIGNAL_UNSPEC && |
2a519311 JB |
403 | (signal < 0 || signal > 100))) |
404 | return NULL; | |
405 | ||
406 | if (WARN_ON(!mgmt || !wiphy || | |
407 | len < offsetof(struct ieee80211_mgmt, u.probe_resp.variable))) | |
408 | return NULL; | |
409 | ||
410 | res = kzalloc(sizeof(*res) + privsz + ielen, gfp); | |
411 | if (!res) | |
412 | return NULL; | |
413 | ||
414 | memcpy(res->pub.bssid, mgmt->bssid, ETH_ALEN); | |
415 | res->pub.channel = channel; | |
2a519311 JB |
416 | res->pub.signal = signal; |
417 | res->pub.tsf = le64_to_cpu(mgmt->u.probe_resp.timestamp); | |
418 | res->pub.beacon_interval = le16_to_cpu(mgmt->u.probe_resp.beacon_int); | |
419 | res->pub.capability = le16_to_cpu(mgmt->u.probe_resp.capab_info); | |
420 | /* point to after the private area */ | |
421 | res->pub.information_elements = (u8 *)res + sizeof(*res) + privsz; | |
422 | memcpy(res->pub.information_elements, mgmt->u.probe_resp.variable, ielen); | |
423 | res->pub.len_information_elements = ielen; | |
424 | ||
425 | kref_init(&res->ref); | |
426 | ||
427 | overwrite = ieee80211_is_probe_resp(mgmt->frame_control); | |
428 | ||
429 | res = cfg80211_bss_update(wiphy_to_dev(wiphy), res, overwrite); | |
430 | if (!res) | |
431 | return NULL; | |
432 | ||
433 | /* cfg80211_bss_update gives us a referenced result */ | |
434 | return &res->pub; | |
435 | } | |
436 | EXPORT_SYMBOL(cfg80211_inform_bss_frame); | |
437 | ||
438 | void cfg80211_put_bss(struct cfg80211_bss *pub) | |
439 | { | |
440 | struct cfg80211_internal_bss *bss; | |
441 | ||
442 | if (!pub) | |
443 | return; | |
444 | ||
445 | bss = container_of(pub, struct cfg80211_internal_bss, pub); | |
446 | kref_put(&bss->ref, bss_release); | |
447 | } | |
448 | EXPORT_SYMBOL(cfg80211_put_bss); | |
449 | ||
d491af19 JB |
450 | void cfg80211_unlink_bss(struct wiphy *wiphy, struct cfg80211_bss *pub) |
451 | { | |
452 | struct cfg80211_registered_device *dev = wiphy_to_dev(wiphy); | |
453 | struct cfg80211_internal_bss *bss; | |
454 | ||
455 | if (WARN_ON(!pub)) | |
456 | return; | |
457 | ||
458 | bss = container_of(pub, struct cfg80211_internal_bss, pub); | |
459 | ||
460 | spin_lock_bh(&dev->bss_lock); | |
461 | ||
462 | list_del(&bss->list); | |
463 | rb_erase(&bss->rbn, &dev->bss_tree); | |
464 | ||
465 | spin_unlock_bh(&dev->bss_lock); | |
466 | ||
467 | kref_put(&bss->ref, bss_release); | |
468 | } | |
469 | EXPORT_SYMBOL(cfg80211_unlink_bss); | |
470 | ||
2a519311 JB |
471 | #ifdef CONFIG_WIRELESS_EXT |
472 | int cfg80211_wext_siwscan(struct net_device *dev, | |
473 | struct iw_request_info *info, | |
474 | union iwreq_data *wrqu, char *extra) | |
475 | { | |
476 | struct cfg80211_registered_device *rdev; | |
477 | struct wiphy *wiphy; | |
478 | struct iw_scan_req *wreq = NULL; | |
479 | struct cfg80211_scan_request *creq; | |
480 | int i, err, n_channels = 0; | |
481 | enum ieee80211_band band; | |
482 | ||
483 | if (!netif_running(dev)) | |
484 | return -ENETDOWN; | |
485 | ||
486 | rdev = cfg80211_get_dev_from_ifindex(dev->ifindex); | |
487 | ||
488 | if (IS_ERR(rdev)) | |
489 | return PTR_ERR(rdev); | |
490 | ||
491 | if (rdev->scan_req) { | |
492 | err = -EBUSY; | |
493 | goto out; | |
494 | } | |
495 | ||
496 | wiphy = &rdev->wiphy; | |
497 | ||
498 | for (band = 0; band < IEEE80211_NUM_BANDS; band++) | |
499 | if (wiphy->bands[band]) | |
500 | n_channels += wiphy->bands[band]->n_channels; | |
501 | ||
502 | creq = kzalloc(sizeof(*creq) + sizeof(struct cfg80211_ssid) + | |
503 | n_channels * sizeof(void *), | |
504 | GFP_ATOMIC); | |
505 | if (!creq) { | |
506 | err = -ENOMEM; | |
507 | goto out; | |
508 | } | |
509 | ||
510 | creq->wiphy = wiphy; | |
511 | creq->ifidx = dev->ifindex; | |
512 | creq->ssids = (void *)(creq + 1); | |
513 | creq->channels = (void *)(creq->ssids + 1); | |
514 | creq->n_channels = n_channels; | |
515 | creq->n_ssids = 1; | |
516 | ||
517 | /* all channels */ | |
518 | i = 0; | |
519 | for (band = 0; band < IEEE80211_NUM_BANDS; band++) { | |
520 | int j; | |
521 | if (!wiphy->bands[band]) | |
522 | continue; | |
523 | for (j = 0; j < wiphy->bands[band]->n_channels; j++) { | |
524 | creq->channels[i] = &wiphy->bands[band]->channels[j]; | |
525 | i++; | |
526 | } | |
527 | } | |
528 | ||
529 | /* translate scan request */ | |
530 | if (wrqu->data.length == sizeof(struct iw_scan_req)) { | |
531 | wreq = (struct iw_scan_req *)extra; | |
532 | ||
533 | if (wrqu->data.flags & IW_SCAN_THIS_ESSID) { | |
534 | if (wreq->essid_len > IEEE80211_MAX_SSID_LEN) | |
535 | return -EINVAL; | |
536 | memcpy(creq->ssids[0].ssid, wreq->essid, wreq->essid_len); | |
537 | creq->ssids[0].ssid_len = wreq->essid_len; | |
538 | } | |
539 | if (wreq->scan_type == IW_SCAN_TYPE_PASSIVE) | |
540 | creq->n_ssids = 0; | |
541 | } | |
542 | ||
543 | rdev->scan_req = creq; | |
544 | err = rdev->ops->scan(wiphy, dev, creq); | |
545 | if (err) { | |
546 | rdev->scan_req = NULL; | |
547 | kfree(creq); | |
548 | } | |
549 | out: | |
550 | cfg80211_put_dev(rdev); | |
551 | return err; | |
552 | } | |
553 | EXPORT_SYMBOL(cfg80211_wext_siwscan); | |
554 | ||
555 | static void ieee80211_scan_add_ies(struct iw_request_info *info, | |
556 | struct cfg80211_bss *bss, | |
557 | char **current_ev, char *end_buf) | |
558 | { | |
559 | u8 *pos, *end, *next; | |
560 | struct iw_event iwe; | |
561 | ||
562 | if (!bss->information_elements || | |
563 | !bss->len_information_elements) | |
564 | return; | |
565 | ||
566 | /* | |
567 | * If needed, fragment the IEs buffer (at IE boundaries) into short | |
568 | * enough fragments to fit into IW_GENERIC_IE_MAX octet messages. | |
569 | */ | |
570 | pos = bss->information_elements; | |
571 | end = pos + bss->len_information_elements; | |
572 | ||
573 | while (end - pos > IW_GENERIC_IE_MAX) { | |
574 | next = pos + 2 + pos[1]; | |
575 | while (next + 2 + next[1] - pos < IW_GENERIC_IE_MAX) | |
576 | next = next + 2 + next[1]; | |
577 | ||
578 | memset(&iwe, 0, sizeof(iwe)); | |
579 | iwe.cmd = IWEVGENIE; | |
580 | iwe.u.data.length = next - pos; | |
581 | *current_ev = iwe_stream_add_point(info, *current_ev, | |
582 | end_buf, &iwe, pos); | |
583 | ||
584 | pos = next; | |
585 | } | |
586 | ||
587 | if (end > pos) { | |
588 | memset(&iwe, 0, sizeof(iwe)); | |
589 | iwe.cmd = IWEVGENIE; | |
590 | iwe.u.data.length = end - pos; | |
591 | *current_ev = iwe_stream_add_point(info, *current_ev, | |
592 | end_buf, &iwe, pos); | |
593 | } | |
594 | } | |
595 | ||
cb3a8eec DW |
596 | static inline unsigned int elapsed_jiffies_msecs(unsigned long start) |
597 | { | |
598 | unsigned long end = jiffies; | |
599 | ||
600 | if (end >= start) | |
601 | return jiffies_to_msecs(end - start); | |
602 | ||
603 | return jiffies_to_msecs(end + (MAX_JIFFY_OFFSET - start) + 1); | |
604 | } | |
2a519311 JB |
605 | |
606 | static char * | |
77965c97 JB |
607 | ieee80211_bss(struct wiphy *wiphy, struct iw_request_info *info, |
608 | struct cfg80211_internal_bss *bss, char *current_ev, | |
609 | char *end_buf) | |
2a519311 JB |
610 | { |
611 | struct iw_event iwe; | |
612 | u8 *buf, *cfg, *p; | |
613 | u8 *ie = bss->pub.information_elements; | |
a77b8552 | 614 | int rem = bss->pub.len_information_elements, i, sig; |
2a519311 JB |
615 | bool ismesh = false; |
616 | ||
617 | memset(&iwe, 0, sizeof(iwe)); | |
618 | iwe.cmd = SIOCGIWAP; | |
619 | iwe.u.ap_addr.sa_family = ARPHRD_ETHER; | |
620 | memcpy(iwe.u.ap_addr.sa_data, bss->pub.bssid, ETH_ALEN); | |
621 | current_ev = iwe_stream_add_event(info, current_ev, end_buf, &iwe, | |
622 | IW_EV_ADDR_LEN); | |
623 | ||
624 | memset(&iwe, 0, sizeof(iwe)); | |
625 | iwe.cmd = SIOCGIWFREQ; | |
626 | iwe.u.freq.m = ieee80211_frequency_to_channel(bss->pub.channel->center_freq); | |
627 | iwe.u.freq.e = 0; | |
628 | current_ev = iwe_stream_add_event(info, current_ev, end_buf, &iwe, | |
629 | IW_EV_FREQ_LEN); | |
630 | ||
631 | memset(&iwe, 0, sizeof(iwe)); | |
632 | iwe.cmd = SIOCGIWFREQ; | |
633 | iwe.u.freq.m = bss->pub.channel->center_freq; | |
634 | iwe.u.freq.e = 6; | |
635 | current_ev = iwe_stream_add_event(info, current_ev, end_buf, &iwe, | |
636 | IW_EV_FREQ_LEN); | |
637 | ||
77965c97 | 638 | if (wiphy->signal_type != CFG80211_SIGNAL_TYPE_NONE) { |
2a519311 JB |
639 | memset(&iwe, 0, sizeof(iwe)); |
640 | iwe.cmd = IWEVQUAL; | |
641 | iwe.u.qual.updated = IW_QUAL_LEVEL_UPDATED | | |
642 | IW_QUAL_NOISE_INVALID | | |
a77b8552 | 643 | IW_QUAL_QUAL_UPDATED; |
77965c97 | 644 | switch (wiphy->signal_type) { |
2a519311 | 645 | case CFG80211_SIGNAL_TYPE_MBM: |
a77b8552 JB |
646 | sig = bss->pub.signal / 100; |
647 | iwe.u.qual.level = sig; | |
2a519311 | 648 | iwe.u.qual.updated |= IW_QUAL_DBM; |
a77b8552 JB |
649 | if (sig < -110) /* rather bad */ |
650 | sig = -110; | |
651 | else if (sig > -40) /* perfect */ | |
652 | sig = -40; | |
653 | /* will give a range of 0 .. 70 */ | |
654 | iwe.u.qual.qual = sig + 110; | |
2a519311 JB |
655 | break; |
656 | case CFG80211_SIGNAL_TYPE_UNSPEC: | |
657 | iwe.u.qual.level = bss->pub.signal; | |
a77b8552 JB |
658 | /* will give range 0 .. 100 */ |
659 | iwe.u.qual.qual = bss->pub.signal; | |
2a519311 JB |
660 | break; |
661 | default: | |
662 | /* not reached */ | |
663 | break; | |
664 | } | |
665 | current_ev = iwe_stream_add_event(info, current_ev, end_buf, | |
666 | &iwe, IW_EV_QUAL_LEN); | |
667 | } | |
668 | ||
669 | memset(&iwe, 0, sizeof(iwe)); | |
670 | iwe.cmd = SIOCGIWENCODE; | |
671 | if (bss->pub.capability & WLAN_CAPABILITY_PRIVACY) | |
672 | iwe.u.data.flags = IW_ENCODE_ENABLED | IW_ENCODE_NOKEY; | |
673 | else | |
674 | iwe.u.data.flags = IW_ENCODE_DISABLED; | |
675 | iwe.u.data.length = 0; | |
676 | current_ev = iwe_stream_add_point(info, current_ev, end_buf, | |
677 | &iwe, ""); | |
678 | ||
679 | while (rem >= 2) { | |
680 | /* invalid data */ | |
681 | if (ie[1] > rem - 2) | |
682 | break; | |
683 | ||
684 | switch (ie[0]) { | |
685 | case WLAN_EID_SSID: | |
686 | memset(&iwe, 0, sizeof(iwe)); | |
687 | iwe.cmd = SIOCGIWESSID; | |
688 | iwe.u.data.length = ie[1]; | |
689 | iwe.u.data.flags = 1; | |
690 | current_ev = iwe_stream_add_point(info, current_ev, end_buf, | |
691 | &iwe, ie + 2); | |
692 | break; | |
693 | case WLAN_EID_MESH_ID: | |
694 | memset(&iwe, 0, sizeof(iwe)); | |
695 | iwe.cmd = SIOCGIWESSID; | |
696 | iwe.u.data.length = ie[1]; | |
697 | iwe.u.data.flags = 1; | |
698 | current_ev = iwe_stream_add_point(info, current_ev, end_buf, | |
699 | &iwe, ie + 2); | |
700 | break; | |
701 | case WLAN_EID_MESH_CONFIG: | |
702 | ismesh = true; | |
703 | if (ie[1] != IEEE80211_MESH_CONFIG_LEN) | |
704 | break; | |
705 | buf = kmalloc(50, GFP_ATOMIC); | |
706 | if (!buf) | |
707 | break; | |
708 | cfg = ie + 2; | |
709 | memset(&iwe, 0, sizeof(iwe)); | |
710 | iwe.cmd = IWEVCUSTOM; | |
711 | sprintf(buf, "Mesh network (version %d)", cfg[0]); | |
712 | iwe.u.data.length = strlen(buf); | |
713 | current_ev = iwe_stream_add_point(info, current_ev, | |
714 | end_buf, | |
715 | &iwe, buf); | |
716 | sprintf(buf, "Path Selection Protocol ID: " | |
717 | "0x%02X%02X%02X%02X", cfg[1], cfg[2], cfg[3], | |
718 | cfg[4]); | |
719 | iwe.u.data.length = strlen(buf); | |
720 | current_ev = iwe_stream_add_point(info, current_ev, | |
721 | end_buf, | |
722 | &iwe, buf); | |
723 | sprintf(buf, "Path Selection Metric ID: " | |
724 | "0x%02X%02X%02X%02X", cfg[5], cfg[6], cfg[7], | |
725 | cfg[8]); | |
726 | iwe.u.data.length = strlen(buf); | |
727 | current_ev = iwe_stream_add_point(info, current_ev, | |
728 | end_buf, | |
729 | &iwe, buf); | |
730 | sprintf(buf, "Congestion Control Mode ID: " | |
731 | "0x%02X%02X%02X%02X", cfg[9], cfg[10], | |
732 | cfg[11], cfg[12]); | |
733 | iwe.u.data.length = strlen(buf); | |
734 | current_ev = iwe_stream_add_point(info, current_ev, | |
735 | end_buf, | |
736 | &iwe, buf); | |
737 | sprintf(buf, "Channel Precedence: " | |
738 | "0x%02X%02X%02X%02X", cfg[13], cfg[14], | |
739 | cfg[15], cfg[16]); | |
740 | iwe.u.data.length = strlen(buf); | |
741 | current_ev = iwe_stream_add_point(info, current_ev, | |
742 | end_buf, | |
743 | &iwe, buf); | |
744 | kfree(buf); | |
745 | break; | |
746 | case WLAN_EID_SUPP_RATES: | |
747 | case WLAN_EID_EXT_SUPP_RATES: | |
748 | /* display all supported rates in readable format */ | |
749 | p = current_ev + iwe_stream_lcp_len(info); | |
750 | ||
751 | memset(&iwe, 0, sizeof(iwe)); | |
752 | iwe.cmd = SIOCGIWRATE; | |
753 | /* Those two flags are ignored... */ | |
754 | iwe.u.bitrate.fixed = iwe.u.bitrate.disabled = 0; | |
755 | ||
756 | for (i = 0; i < ie[1]; i++) { | |
757 | iwe.u.bitrate.value = | |
758 | ((ie[i + 2] & 0x7f) * 500000); | |
759 | p = iwe_stream_add_value(info, current_ev, p, | |
760 | end_buf, &iwe, IW_EV_PARAM_LEN); | |
761 | } | |
762 | current_ev = p; | |
763 | break; | |
764 | } | |
765 | rem -= ie[1] + 2; | |
766 | ie += ie[1] + 2; | |
767 | } | |
768 | ||
769 | if (bss->pub.capability & (WLAN_CAPABILITY_ESS | WLAN_CAPABILITY_IBSS) | |
770 | || ismesh) { | |
771 | memset(&iwe, 0, sizeof(iwe)); | |
772 | iwe.cmd = SIOCGIWMODE; | |
773 | if (ismesh) | |
774 | iwe.u.mode = IW_MODE_MESH; | |
775 | else if (bss->pub.capability & WLAN_CAPABILITY_ESS) | |
776 | iwe.u.mode = IW_MODE_MASTER; | |
777 | else | |
778 | iwe.u.mode = IW_MODE_ADHOC; | |
779 | current_ev = iwe_stream_add_event(info, current_ev, end_buf, | |
780 | &iwe, IW_EV_UINT_LEN); | |
781 | } | |
782 | ||
783 | buf = kmalloc(30, GFP_ATOMIC); | |
784 | if (buf) { | |
785 | memset(&iwe, 0, sizeof(iwe)); | |
786 | iwe.cmd = IWEVCUSTOM; | |
787 | sprintf(buf, "tsf=%016llx", (unsigned long long)(bss->pub.tsf)); | |
788 | iwe.u.data.length = strlen(buf); | |
789 | current_ev = iwe_stream_add_point(info, current_ev, end_buf, | |
790 | &iwe, buf); | |
791 | memset(&iwe, 0, sizeof(iwe)); | |
792 | iwe.cmd = IWEVCUSTOM; | |
cb3a8eec DW |
793 | sprintf(buf, " Last beacon: %ums ago", |
794 | elapsed_jiffies_msecs(bss->ts)); | |
2a519311 JB |
795 | iwe.u.data.length = strlen(buf); |
796 | current_ev = iwe_stream_add_point(info, current_ev, | |
797 | end_buf, &iwe, buf); | |
798 | kfree(buf); | |
799 | } | |
800 | ||
801 | ieee80211_scan_add_ies(info, &bss->pub, ¤t_ev, end_buf); | |
802 | ||
803 | return current_ev; | |
804 | } | |
805 | ||
806 | ||
807 | static int ieee80211_scan_results(struct cfg80211_registered_device *dev, | |
808 | struct iw_request_info *info, | |
809 | char *buf, size_t len) | |
810 | { | |
811 | char *current_ev = buf; | |
812 | char *end_buf = buf + len; | |
813 | struct cfg80211_internal_bss *bss; | |
814 | ||
815 | spin_lock_bh(&dev->bss_lock); | |
816 | cfg80211_bss_expire(dev); | |
817 | ||
818 | list_for_each_entry(bss, &dev->bss_list, list) { | |
819 | if (buf + len - current_ev <= IW_EV_ADDR_LEN) { | |
820 | spin_unlock_bh(&dev->bss_lock); | |
821 | return -E2BIG; | |
822 | } | |
77965c97 JB |
823 | current_ev = ieee80211_bss(&dev->wiphy, info, bss, |
824 | current_ev, end_buf); | |
2a519311 JB |
825 | } |
826 | spin_unlock_bh(&dev->bss_lock); | |
827 | return current_ev - buf; | |
828 | } | |
829 | ||
830 | ||
831 | int cfg80211_wext_giwscan(struct net_device *dev, | |
832 | struct iw_request_info *info, | |
833 | struct iw_point *data, char *extra) | |
834 | { | |
835 | struct cfg80211_registered_device *rdev; | |
836 | int res; | |
837 | ||
838 | if (!netif_running(dev)) | |
839 | return -ENETDOWN; | |
840 | ||
841 | rdev = cfg80211_get_dev_from_ifindex(dev->ifindex); | |
842 | ||
843 | if (IS_ERR(rdev)) | |
844 | return PTR_ERR(rdev); | |
845 | ||
846 | if (rdev->scan_req) { | |
847 | res = -EAGAIN; | |
848 | goto out; | |
849 | } | |
850 | ||
851 | res = ieee80211_scan_results(rdev, info, extra, data->length); | |
852 | data->length = 0; | |
853 | if (res >= 0) { | |
854 | data->length = res; | |
855 | res = 0; | |
856 | } | |
857 | ||
858 | out: | |
859 | cfg80211_put_dev(rdev); | |
860 | return res; | |
861 | } | |
862 | EXPORT_SYMBOL(cfg80211_wext_giwscan); | |
863 | #endif |