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-rw-r--r--net/mac80211/scan.c763
1 files changed, 198 insertions, 565 deletions
diff --git a/net/mac80211/scan.c b/net/mac80211/scan.c
index f5c7c3371929..3bf9839f5916 100644
--- a/net/mac80211/scan.c
+++ b/net/mac80211/scan.c
@@ -12,14 +12,11 @@
12 * published by the Free Software Foundation. 12 * published by the Free Software Foundation.
13 */ 13 */
14 14
15/* TODO: 15/* TODO: figure out how to avoid that the "current BSS" expires */
16 * order BSS list by RSSI(?) ("quality of AP")
17 * scan result table filtering (by capability (privacy, IBSS/BSS, WPA/RSN IE,
18 * SSID)
19 */
20 16
21#include <linux/wireless.h> 17#include <linux/wireless.h>
22#include <linux/if_arp.h> 18#include <linux/if_arp.h>
19#include <linux/rtnetlink.h>
23#include <net/mac80211.h> 20#include <net/mac80211.h>
24#include <net/iw_handler.h> 21#include <net/iw_handler.h>
25 22
@@ -30,192 +27,29 @@
30#define IEEE80211_CHANNEL_TIME (HZ / 33) 27#define IEEE80211_CHANNEL_TIME (HZ / 33)
31#define IEEE80211_PASSIVE_CHANNEL_TIME (HZ / 5) 28#define IEEE80211_PASSIVE_CHANNEL_TIME (HZ / 5)
32 29
33void ieee80211_rx_bss_list_init(struct ieee80211_local *local)
34{
35 spin_lock_init(&local->bss_lock);
36 INIT_LIST_HEAD(&local->bss_list);
37}
38
39void ieee80211_rx_bss_list_deinit(struct ieee80211_local *local)
40{
41 struct ieee80211_bss *bss, *tmp;
42
43 list_for_each_entry_safe(bss, tmp, &local->bss_list, list)
44 ieee80211_rx_bss_put(local, bss);
45}
46
47struct ieee80211_bss * 30struct ieee80211_bss *
48ieee80211_rx_bss_get(struct ieee80211_local *local, u8 *bssid, int freq, 31ieee80211_rx_bss_get(struct ieee80211_local *local, u8 *bssid, int freq,
49 u8 *ssid, u8 ssid_len) 32 u8 *ssid, u8 ssid_len)
50{ 33{
51 struct ieee80211_bss *bss; 34 return (void *)cfg80211_get_bss(local->hw.wiphy,
52 35 ieee80211_get_channel(local->hw.wiphy,
53 spin_lock_bh(&local->bss_lock); 36 freq),
54 bss = local->bss_hash[STA_HASH(bssid)]; 37 bssid, ssid, ssid_len,
55 while (bss) { 38 0, 0);
56 if (!bss_mesh_cfg(bss) &&
57 !memcmp(bss->bssid, bssid, ETH_ALEN) &&
58 bss->freq == freq &&
59 bss->ssid_len == ssid_len &&
60 (ssid_len == 0 || !memcmp(bss->ssid, ssid, ssid_len))) {
61 atomic_inc(&bss->users);
62 break;
63 }
64 bss = bss->hnext;
65 }
66 spin_unlock_bh(&local->bss_lock);
67 return bss;
68}
69
70/* Caller must hold local->bss_lock */
71static void __ieee80211_rx_bss_hash_add(struct ieee80211_local *local,
72 struct ieee80211_bss *bss)
73{
74 u8 hash_idx;
75
76 if (bss_mesh_cfg(bss))
77 hash_idx = mesh_id_hash(bss_mesh_id(bss),
78 bss_mesh_id_len(bss));
79 else
80 hash_idx = STA_HASH(bss->bssid);
81
82 bss->hnext = local->bss_hash[hash_idx];
83 local->bss_hash[hash_idx] = bss;
84}
85
86/* Caller must hold local->bss_lock */
87static void __ieee80211_rx_bss_hash_del(struct ieee80211_local *local,
88 struct ieee80211_bss *bss)
89{
90 struct ieee80211_bss *b, *prev = NULL;
91 b = local->bss_hash[STA_HASH(bss->bssid)];
92 while (b) {
93 if (b == bss) {
94 if (!prev)
95 local->bss_hash[STA_HASH(bss->bssid)] =
96 bss->hnext;
97 else
98 prev->hnext = bss->hnext;
99 break;
100 }
101 prev = b;
102 b = b->hnext;
103 }
104}
105
106struct ieee80211_bss *
107ieee80211_rx_bss_add(struct ieee80211_local *local, u8 *bssid, int freq,
108 u8 *ssid, u8 ssid_len)
109{
110 struct ieee80211_bss *bss;
111
112 bss = kzalloc(sizeof(*bss), GFP_ATOMIC);
113 if (!bss)
114 return NULL;
115 atomic_set(&bss->users, 2);
116 memcpy(bss->bssid, bssid, ETH_ALEN);
117 bss->freq = freq;
118 if (ssid && ssid_len <= IEEE80211_MAX_SSID_LEN) {
119 memcpy(bss->ssid, ssid, ssid_len);
120 bss->ssid_len = ssid_len;
121 }
122
123 spin_lock_bh(&local->bss_lock);
124 /* TODO: order by RSSI? */
125 list_add_tail(&bss->list, &local->bss_list);
126 __ieee80211_rx_bss_hash_add(local, bss);
127 spin_unlock_bh(&local->bss_lock);
128 return bss;
129}
130
131#ifdef CONFIG_MAC80211_MESH
132static struct ieee80211_bss *
133ieee80211_rx_mesh_bss_get(struct ieee80211_local *local, u8 *mesh_id, int mesh_id_len,
134 u8 *mesh_cfg, int freq)
135{
136 struct ieee80211_bss *bss;
137
138 spin_lock_bh(&local->bss_lock);
139 bss = local->bss_hash[mesh_id_hash(mesh_id, mesh_id_len)];
140 while (bss) {
141 if (bss_mesh_cfg(bss) &&
142 !memcmp(bss_mesh_cfg(bss), mesh_cfg, MESH_CFG_CMP_LEN) &&
143 bss->freq == freq &&
144 mesh_id_len == bss->mesh_id_len &&
145 (mesh_id_len == 0 || !memcmp(bss->mesh_id, mesh_id,
146 mesh_id_len))) {
147 atomic_inc(&bss->users);
148 break;
149 }
150 bss = bss->hnext;
151 }
152 spin_unlock_bh(&local->bss_lock);
153 return bss;
154} 39}
155 40
156static struct ieee80211_bss * 41static void ieee80211_rx_bss_free(struct cfg80211_bss *cbss)
157ieee80211_rx_mesh_bss_add(struct ieee80211_local *local, u8 *mesh_id, int mesh_id_len,
158 u8 *mesh_cfg, int mesh_config_len, int freq)
159{ 42{
160 struct ieee80211_bss *bss; 43 struct ieee80211_bss *bss = (void *)cbss;
161
162 if (mesh_config_len != IEEE80211_MESH_CONFIG_LEN)
163 return NULL;
164
165 bss = kzalloc(sizeof(*bss), GFP_ATOMIC);
166 if (!bss)
167 return NULL;
168
169 bss->mesh_cfg = kmalloc(MESH_CFG_CMP_LEN, GFP_ATOMIC);
170 if (!bss->mesh_cfg) {
171 kfree(bss);
172 return NULL;
173 }
174
175 if (mesh_id_len && mesh_id_len <= IEEE80211_MAX_MESH_ID_LEN) {
176 bss->mesh_id = kmalloc(mesh_id_len, GFP_ATOMIC);
177 if (!bss->mesh_id) {
178 kfree(bss->mesh_cfg);
179 kfree(bss);
180 return NULL;
181 }
182 memcpy(bss->mesh_id, mesh_id, mesh_id_len);
183 }
184
185 atomic_set(&bss->users, 2);
186 memcpy(bss->mesh_cfg, mesh_cfg, MESH_CFG_CMP_LEN);
187 bss->mesh_id_len = mesh_id_len;
188 bss->freq = freq;
189 spin_lock_bh(&local->bss_lock);
190 /* TODO: order by RSSI? */
191 list_add_tail(&bss->list, &local->bss_list);
192 __ieee80211_rx_bss_hash_add(local, bss);
193 spin_unlock_bh(&local->bss_lock);
194 return bss;
195}
196#endif
197 44
198static void ieee80211_rx_bss_free(struct ieee80211_bss *bss)
199{
200 kfree(bss->ies);
201 kfree(bss_mesh_id(bss)); 45 kfree(bss_mesh_id(bss));
202 kfree(bss_mesh_cfg(bss)); 46 kfree(bss_mesh_cfg(bss));
203 kfree(bss);
204} 47}
205 48
206void ieee80211_rx_bss_put(struct ieee80211_local *local, 49void ieee80211_rx_bss_put(struct ieee80211_local *local,
207 struct ieee80211_bss *bss) 50 struct ieee80211_bss *bss)
208{ 51{
209 local_bh_disable(); 52 cfg80211_put_bss((struct cfg80211_bss *)bss);
210 if (!atomic_dec_and_lock(&bss->users, &local->bss_lock)) {
211 local_bh_enable();
212 return;
213 }
214
215 __ieee80211_rx_bss_hash_del(local, bss);
216 list_del(&bss->list);
217 spin_unlock_bh(&local->bss_lock);
218 ieee80211_rx_bss_free(bss);
219} 53}
220 54
221struct ieee80211_bss * 55struct ieee80211_bss *
@@ -224,39 +58,25 @@ ieee80211_bss_info_update(struct ieee80211_local *local,
224 struct ieee80211_mgmt *mgmt, 58 struct ieee80211_mgmt *mgmt,
225 size_t len, 59 size_t len,
226 struct ieee802_11_elems *elems, 60 struct ieee802_11_elems *elems,
227 int freq, bool beacon) 61 struct ieee80211_channel *channel,
62 bool beacon)
228{ 63{
229 struct ieee80211_bss *bss; 64 struct ieee80211_bss *bss;
230 int clen; 65 int clen;
66 s32 signal = 0;
231 67
232#ifdef CONFIG_MAC80211_MESH 68 if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM)
233 if (elems->mesh_config) 69 signal = rx_status->signal * 100;
234 bss = ieee80211_rx_mesh_bss_get(local, elems->mesh_id, 70 else if (local->hw.flags & IEEE80211_HW_SIGNAL_UNSPEC)
235 elems->mesh_id_len, elems->mesh_config, freq); 71 signal = (rx_status->signal * 100) / local->hw.max_signal;
236 else 72
237#endif 73 bss = (void *)cfg80211_inform_bss_frame(local->hw.wiphy, channel,
238 bss = ieee80211_rx_bss_get(local, mgmt->bssid, freq, 74 mgmt, len, signal, GFP_ATOMIC);
239 elems->ssid, elems->ssid_len); 75
240 if (!bss) { 76 if (!bss)
241#ifdef CONFIG_MAC80211_MESH 77 return NULL;
242 if (elems->mesh_config) 78
243 bss = ieee80211_rx_mesh_bss_add(local, elems->mesh_id, 79 bss->cbss.free_priv = ieee80211_rx_bss_free;
244 elems->mesh_id_len, elems->mesh_config,
245 elems->mesh_config_len, freq);
246 else
247#endif
248 bss = ieee80211_rx_bss_add(local, mgmt->bssid, freq,
249 elems->ssid, elems->ssid_len);
250 if (!bss)
251 return NULL;
252 } else {
253#if 0
254 /* TODO: order by RSSI? */
255 spin_lock_bh(&local->bss_lock);
256 list_move_tail(&bss->list, &local->bss_list);
257 spin_unlock_bh(&local->bss_lock);
258#endif
259 }
260 80
261 /* save the ERP value so that it is available at association time */ 81 /* save the ERP value so that it is available at association time */
262 if (elems->erp_info && elems->erp_info_len >= 1) { 82 if (elems->erp_info && elems->erp_info_len >= 1) {
@@ -264,9 +84,6 @@ ieee80211_bss_info_update(struct ieee80211_local *local,
264 bss->has_erp_value = 1; 84 bss->has_erp_value = 1;
265 } 85 }
266 86
267 bss->beacon_int = le16_to_cpu(mgmt->u.beacon.beacon_int);
268 bss->capability = le16_to_cpu(mgmt->u.beacon.capab_info);
269
270 if (elems->tim) { 87 if (elems->tim) {
271 struct ieee80211_tim_ie *tim_ie = 88 struct ieee80211_tim_ie *tim_ie =
272 (struct ieee80211_tim_ie *)elems->tim; 89 (struct ieee80211_tim_ie *)elems->tim;
@@ -295,37 +112,27 @@ ieee80211_bss_info_update(struct ieee80211_local *local,
295 bss->supp_rates_len += clen; 112 bss->supp_rates_len += clen;
296 } 113 }
297 114
298 bss->band = rx_status->band;
299
300 bss->timestamp = le64_to_cpu(mgmt->u.beacon.timestamp);
301 bss->last_update = jiffies;
302 bss->signal = rx_status->signal;
303 bss->noise = rx_status->noise;
304 bss->qual = rx_status->qual;
305 bss->wmm_used = elems->wmm_param || elems->wmm_info; 115 bss->wmm_used = elems->wmm_param || elems->wmm_info;
306 116
307 if (!beacon) 117 if (!beacon)
308 bss->last_probe_resp = jiffies; 118 bss->last_probe_resp = jiffies;
309 119
310 /*
311 * For probe responses, or if we don't have any information yet,
312 * use the IEs from the beacon.
313 */
314 if (!bss->ies || !beacon) {
315 if (bss->ies == NULL || bss->ies_len < elems->total_len) {
316 kfree(bss->ies);
317 bss->ies = kmalloc(elems->total_len, GFP_ATOMIC);
318 }
319 if (bss->ies) {
320 memcpy(bss->ies, elems->ie_start, elems->total_len);
321 bss->ies_len = elems->total_len;
322 } else
323 bss->ies_len = 0;
324 }
325
326 return bss; 120 return bss;
327} 121}
328 122
123void ieee80211_rx_bss_remove(struct ieee80211_sub_if_data *sdata, u8 *bssid,
124 int freq, u8 *ssid, u8 ssid_len)
125{
126 struct ieee80211_bss *bss;
127 struct ieee80211_local *local = sdata->local;
128
129 bss = ieee80211_rx_bss_get(local, bssid, freq, ssid, ssid_len);
130 if (bss) {
131 cfg80211_unlink_bss(local->hw.wiphy, (void *)bss);
132 ieee80211_rx_bss_put(local, bss);
133 }
134}
135
329ieee80211_rx_result 136ieee80211_rx_result
330ieee80211_scan_rx(struct ieee80211_sub_if_data *sdata, struct sk_buff *skb, 137ieee80211_scan_rx(struct ieee80211_sub_if_data *sdata, struct sk_buff *skb,
331 struct ieee80211_rx_status *rx_status) 138 struct ieee80211_rx_status *rx_status)
@@ -387,7 +194,7 @@ ieee80211_scan_rx(struct ieee80211_sub_if_data *sdata, struct sk_buff *skb,
387 194
388 bss = ieee80211_bss_info_update(sdata->local, rx_status, 195 bss = ieee80211_bss_info_update(sdata->local, rx_status,
389 mgmt, skb->len, &elems, 196 mgmt, skb->len, &elems,
390 freq, beacon); 197 channel, beacon);
391 if (bss) 198 if (bss)
392 ieee80211_rx_bss_put(sdata->local, bss); 199 ieee80211_rx_bss_put(sdata->local, bss);
393 200
@@ -395,56 +202,94 @@ ieee80211_scan_rx(struct ieee80211_sub_if_data *sdata, struct sk_buff *skb,
395 return RX_QUEUED; 202 return RX_QUEUED;
396} 203}
397 204
398static void ieee80211_send_nullfunc(struct ieee80211_local *local, 205void ieee80211_scan_failed(struct ieee80211_local *local)
399 struct ieee80211_sub_if_data *sdata,
400 int powersave)
401{ 206{
402 struct sk_buff *skb; 207 if (WARN_ON(!local->scan_req))
403 struct ieee80211_hdr *nullfunc;
404 __le16 fc;
405
406 skb = dev_alloc_skb(local->hw.extra_tx_headroom + 24);
407 if (!skb) {
408 printk(KERN_DEBUG "%s: failed to allocate buffer for nullfunc "
409 "frame\n", sdata->dev->name);
410 return; 208 return;
209
210 /* notify cfg80211 about the failed scan */
211 if (local->scan_req != &local->int_scan_req)
212 cfg80211_scan_done(local->scan_req, true);
213
214 local->scan_req = NULL;
215}
216
217/*
218 * inform AP that we will go to sleep so that it will buffer the frames
219 * while we scan
220 */
221static void ieee80211_scan_ps_enable(struct ieee80211_sub_if_data *sdata)
222{
223 struct ieee80211_local *local = sdata->local;
224 bool ps = false;
225
226 /* FIXME: what to do when local->pspolling is true? */
227
228 del_timer_sync(&local->dynamic_ps_timer);
229 cancel_work_sync(&local->dynamic_ps_enable_work);
230
231 if (local->hw.conf.flags & IEEE80211_CONF_PS) {
232 ps = true;
233 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
234 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
235 }
236
237 if (!ps || !(local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK))
238 /*
239 * If power save was enabled, no need to send a nullfunc
240 * frame because AP knows that we are sleeping. But if the
241 * hardware is creating the nullfunc frame for power save
242 * status (ie. IEEE80211_HW_PS_NULLFUNC_STACK is not
243 * enabled) and power save was enabled, the firmware just
244 * sent a null frame with power save disabled. So we need
245 * to send a new nullfunc frame to inform the AP that we
246 * are again sleeping.
247 */
248 ieee80211_send_nullfunc(local, sdata, 1);
249}
250
251/* inform AP that we are awake again, unless power save is enabled */
252static void ieee80211_scan_ps_disable(struct ieee80211_sub_if_data *sdata)
253{
254 struct ieee80211_local *local = sdata->local;
255
256 if (!local->powersave)
257 ieee80211_send_nullfunc(local, sdata, 0);
258 else {
259 /*
260 * In !IEEE80211_HW_PS_NULLFUNC_STACK case the hardware
261 * will send a nullfunc frame with the powersave bit set
262 * even though the AP already knows that we are sleeping.
263 * This could be avoided by sending a null frame with power
264 * save bit disabled before enabling the power save, but
265 * this doesn't gain anything.
266 *
267 * When IEEE80211_HW_PS_NULLFUNC_STACK is enabled, no need
268 * to send a nullfunc frame because AP already knows that
269 * we are sleeping, let's just enable power save mode in
270 * hardware.
271 */
272 local->hw.conf.flags |= IEEE80211_CONF_PS;
273 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
411 } 274 }
412 skb_reserve(skb, local->hw.extra_tx_headroom);
413
414 nullfunc = (struct ieee80211_hdr *) skb_put(skb, 24);
415 memset(nullfunc, 0, 24);
416 fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_NULLFUNC |
417 IEEE80211_FCTL_TODS);
418 if (powersave)
419 fc |= cpu_to_le16(IEEE80211_FCTL_PM);
420 nullfunc->frame_control = fc;
421 memcpy(nullfunc->addr1, sdata->u.sta.bssid, ETH_ALEN);
422 memcpy(nullfunc->addr2, sdata->dev->dev_addr, ETH_ALEN);
423 memcpy(nullfunc->addr3, sdata->u.sta.bssid, ETH_ALEN);
424
425 ieee80211_tx_skb(sdata, skb, 0);
426} 275}
427 276
428void ieee80211_scan_completed(struct ieee80211_hw *hw) 277void ieee80211_scan_completed(struct ieee80211_hw *hw, bool aborted)
429{ 278{
430 struct ieee80211_local *local = hw_to_local(hw); 279 struct ieee80211_local *local = hw_to_local(hw);
431 struct ieee80211_sub_if_data *sdata; 280 struct ieee80211_sub_if_data *sdata;
432 union iwreq_data wrqu;
433 281
434 if (WARN_ON(!local->hw_scanning && !local->sw_scanning)) 282 if (WARN_ON(!local->hw_scanning && !local->sw_scanning))
435 return; 283 return;
436 284
437 local->last_scan_completed = jiffies; 285 if (WARN_ON(!local->scan_req))
438 memset(&wrqu, 0, sizeof(wrqu)); 286 return;
439 287
440 /* 288 if (local->scan_req != &local->int_scan_req)
441 * local->scan_sdata could have been NULLed by the interface 289 cfg80211_scan_done(local->scan_req, aborted);
442 * down code in case we were scanning on an interface that is 290 local->scan_req = NULL;
443 * being taken down. 291
444 */ 292 local->last_scan_completed = jiffies;
445 sdata = local->scan_sdata;
446 if (sdata)
447 wireless_send_event(sdata->dev, SIOCGIWSCAN, &wrqu, NULL);
448 293
449 if (local->hw_scanning) { 294 if (local->hw_scanning) {
450 local->hw_scanning = false; 295 local->hw_scanning = false;
@@ -472,34 +317,46 @@ void ieee80211_scan_completed(struct ieee80211_hw *hw)
472 netif_addr_unlock(local->mdev); 317 netif_addr_unlock(local->mdev);
473 netif_tx_unlock_bh(local->mdev); 318 netif_tx_unlock_bh(local->mdev);
474 319
475 rcu_read_lock(); 320 if (local->ops->sw_scan_complete)
476 list_for_each_entry_rcu(sdata, &local->interfaces, list) { 321 local->ops->sw_scan_complete(local_to_hw(local));
322
323 mutex_lock(&local->iflist_mtx);
324 list_for_each_entry(sdata, &local->interfaces, list) {
325 if (!netif_running(sdata->dev))
326 continue;
327
477 /* Tell AP we're back */ 328 /* Tell AP we're back */
478 if (sdata->vif.type == NL80211_IFTYPE_STATION) { 329 if (sdata->vif.type == NL80211_IFTYPE_STATION) {
479 if (sdata->u.sta.flags & IEEE80211_STA_ASSOCIATED) { 330 if (sdata->u.mgd.flags & IEEE80211_STA_ASSOCIATED) {
480 ieee80211_send_nullfunc(local, sdata, 0); 331 ieee80211_scan_ps_disable(sdata);
481 netif_tx_wake_all_queues(sdata->dev); 332 netif_tx_wake_all_queues(sdata->dev);
482 } 333 }
483 } else 334 } else
484 netif_tx_wake_all_queues(sdata->dev); 335 netif_tx_wake_all_queues(sdata->dev);
336
337 /* re-enable beaconing */
338 if (sdata->vif.type == NL80211_IFTYPE_AP ||
339 sdata->vif.type == NL80211_IFTYPE_ADHOC ||
340 sdata->vif.type == NL80211_IFTYPE_MESH_POINT)
341 ieee80211_if_config(sdata,
342 IEEE80211_IFCC_BEACON_ENABLED);
485 } 343 }
486 rcu_read_unlock(); 344 mutex_unlock(&local->iflist_mtx);
487 345
488 done: 346 done:
489 ieee80211_mlme_notify_scan_completed(local); 347 ieee80211_mlme_notify_scan_completed(local);
348 ieee80211_ibss_notify_scan_completed(local);
490 ieee80211_mesh_notify_scan_completed(local); 349 ieee80211_mesh_notify_scan_completed(local);
491} 350}
492EXPORT_SYMBOL(ieee80211_scan_completed); 351EXPORT_SYMBOL(ieee80211_scan_completed);
493 352
494
495void ieee80211_scan_work(struct work_struct *work) 353void ieee80211_scan_work(struct work_struct *work)
496{ 354{
497 struct ieee80211_local *local = 355 struct ieee80211_local *local =
498 container_of(work, struct ieee80211_local, scan_work.work); 356 container_of(work, struct ieee80211_local, scan_work.work);
499 struct ieee80211_sub_if_data *sdata = local->scan_sdata; 357 struct ieee80211_sub_if_data *sdata = local->scan_sdata;
500 struct ieee80211_supported_band *sband;
501 struct ieee80211_channel *chan; 358 struct ieee80211_channel *chan;
502 int skip; 359 int skip, i;
503 unsigned long next_delay = 0; 360 unsigned long next_delay = 0;
504 361
505 /* 362 /*
@@ -510,33 +367,13 @@ void ieee80211_scan_work(struct work_struct *work)
510 367
511 switch (local->scan_state) { 368 switch (local->scan_state) {
512 case SCAN_SET_CHANNEL: 369 case SCAN_SET_CHANNEL:
513 /*
514 * Get current scan band. scan_band may be IEEE80211_NUM_BANDS
515 * after we successfully scanned the last channel of the last
516 * band (and the last band is supported by the hw)
517 */
518 if (local->scan_band < IEEE80211_NUM_BANDS)
519 sband = local->hw.wiphy->bands[local->scan_band];
520 else
521 sband = NULL;
522
523 /*
524 * If we are at an unsupported band and have more bands
525 * left to scan, advance to the next supported one.
526 */
527 while (!sband && local->scan_band < IEEE80211_NUM_BANDS - 1) {
528 local->scan_band++;
529 sband = local->hw.wiphy->bands[local->scan_band];
530 local->scan_channel_idx = 0;
531 }
532
533 /* if no more bands/channels left, complete scan */ 370 /* if no more bands/channels left, complete scan */
534 if (!sband || local->scan_channel_idx >= sband->n_channels) { 371 if (local->scan_channel_idx >= local->scan_req->n_channels) {
535 ieee80211_scan_completed(local_to_hw(local)); 372 ieee80211_scan_completed(local_to_hw(local), false);
536 return; 373 return;
537 } 374 }
538 skip = 0; 375 skip = 0;
539 chan = &sband->channels[local->scan_channel_idx]; 376 chan = local->scan_req->channels[local->scan_channel_idx];
540 377
541 if (chan->flags & IEEE80211_CHAN_DISABLED || 378 if (chan->flags & IEEE80211_CHAN_DISABLED ||
542 (sdata->vif.type == NL80211_IFTYPE_ADHOC && 379 (sdata->vif.type == NL80211_IFTYPE_ADHOC &&
@@ -552,15 +389,6 @@ void ieee80211_scan_work(struct work_struct *work)
552 389
553 /* advance state machine to next channel/band */ 390 /* advance state machine to next channel/band */
554 local->scan_channel_idx++; 391 local->scan_channel_idx++;
555 if (local->scan_channel_idx >= sband->n_channels) {
556 /*
557 * scan_band may end up == IEEE80211_NUM_BANDS, but
558 * we'll catch that case above and complete the scan
559 * if that is the case.
560 */
561 local->scan_band++;
562 local->scan_channel_idx = 0;
563 }
564 392
565 if (skip) 393 if (skip)
566 break; 394 break;
@@ -573,10 +401,15 @@ void ieee80211_scan_work(struct work_struct *work)
573 next_delay = IEEE80211_PASSIVE_CHANNEL_TIME; 401 next_delay = IEEE80211_PASSIVE_CHANNEL_TIME;
574 local->scan_state = SCAN_SET_CHANNEL; 402 local->scan_state = SCAN_SET_CHANNEL;
575 403
576 if (local->scan_channel->flags & IEEE80211_CHAN_PASSIVE_SCAN) 404 if (local->scan_channel->flags & IEEE80211_CHAN_PASSIVE_SCAN ||
405 !local->scan_req->n_ssids)
577 break; 406 break;
578 ieee80211_send_probe_req(sdata, NULL, local->scan_ssid, 407 for (i = 0; i < local->scan_req->n_ssids; i++)
579 local->scan_ssid_len); 408 ieee80211_send_probe_req(
409 sdata, NULL,
410 local->scan_req->ssids[i].ssid,
411 local->scan_req->ssids[i].ssid_len,
412 local->scan_req->ie, local->scan_req->ie_len);
580 next_delay = IEEE80211_CHANNEL_TIME; 413 next_delay = IEEE80211_CHANNEL_TIME;
581 break; 414 break;
582 } 415 }
@@ -587,14 +420,19 @@ void ieee80211_scan_work(struct work_struct *work)
587 420
588 421
589int ieee80211_start_scan(struct ieee80211_sub_if_data *scan_sdata, 422int ieee80211_start_scan(struct ieee80211_sub_if_data *scan_sdata,
590 u8 *ssid, size_t ssid_len) 423 struct cfg80211_scan_request *req)
591{ 424{
592 struct ieee80211_local *local = scan_sdata->local; 425 struct ieee80211_local *local = scan_sdata->local;
593 struct ieee80211_sub_if_data *sdata; 426 struct ieee80211_sub_if_data *sdata;
594 427
595 if (ssid_len > IEEE80211_MAX_SSID_LEN) 428 if (!req)
596 return -EINVAL; 429 return -EINVAL;
597 430
431 if (local->scan_req && local->scan_req != req)
432 return -EBUSY;
433
434 local->scan_req = req;
435
598 /* MLME-SCAN.request (page 118) page 144 (11.1.3.1) 436 /* MLME-SCAN.request (page 118) page 144 (11.1.3.1)
599 * BSSType: INFRASTRUCTURE, INDEPENDENT, ANY_BSS 437 * BSSType: INFRASTRUCTURE, INDEPENDENT, ANY_BSS
600 * BSSID: MACAddress 438 * BSSID: MACAddress
@@ -622,7 +460,7 @@ int ieee80211_start_scan(struct ieee80211_sub_if_data *scan_sdata,
622 int rc; 460 int rc;
623 461
624 local->hw_scanning = true; 462 local->hw_scanning = true;
625 rc = local->ops->hw_scan(local_to_hw(local), ssid, ssid_len); 463 rc = local->ops->hw_scan(local_to_hw(local), req);
626 if (rc) { 464 if (rc) {
627 local->hw_scanning = false; 465 local->hw_scanning = false;
628 return rc; 466 return rc;
@@ -631,29 +469,49 @@ int ieee80211_start_scan(struct ieee80211_sub_if_data *scan_sdata,
631 return 0; 469 return 0;
632 } 470 }
633 471
472 /*
473 * Hardware/driver doesn't support hw_scan, so use software
474 * scanning instead. First send a nullfunc frame with power save
475 * bit on so that AP will buffer the frames for us while we are not
476 * listening, then send probe requests to each channel and wait for
477 * the responses. After all channels are scanned, tune back to the
478 * original channel and send a nullfunc frame with power save bit
479 * off to trigger the AP to send us all the buffered frames.
480 *
481 * Note that while local->sw_scanning is true everything else but
482 * nullfunc frames and probe requests will be dropped in
483 * ieee80211_tx_h_check_assoc().
484 */
634 local->sw_scanning = true; 485 local->sw_scanning = true;
486 if (local->ops->sw_scan_start)
487 local->ops->sw_scan_start(local_to_hw(local));
488
489 mutex_lock(&local->iflist_mtx);
490 list_for_each_entry(sdata, &local->interfaces, list) {
491 if (!netif_running(sdata->dev))
492 continue;
493
494 /* disable beaconing */
495 if (sdata->vif.type == NL80211_IFTYPE_AP ||
496 sdata->vif.type == NL80211_IFTYPE_ADHOC ||
497 sdata->vif.type == NL80211_IFTYPE_MESH_POINT)
498 ieee80211_if_config(sdata,
499 IEEE80211_IFCC_BEACON_ENABLED);
635 500
636 rcu_read_lock();
637 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
638 if (sdata->vif.type == NL80211_IFTYPE_STATION) { 501 if (sdata->vif.type == NL80211_IFTYPE_STATION) {
639 if (sdata->u.sta.flags & IEEE80211_STA_ASSOCIATED) { 502 if (sdata->u.mgd.flags & IEEE80211_STA_ASSOCIATED) {
640 netif_tx_stop_all_queues(sdata->dev); 503 netif_tx_stop_all_queues(sdata->dev);
641 ieee80211_send_nullfunc(local, sdata, 1); 504 ieee80211_scan_ps_enable(sdata);
642 } 505 }
643 } else 506 } else
644 netif_tx_stop_all_queues(sdata->dev); 507 netif_tx_stop_all_queues(sdata->dev);
645 } 508 }
646 rcu_read_unlock(); 509 mutex_unlock(&local->iflist_mtx);
647 510
648 if (ssid) {
649 local->scan_ssid_len = ssid_len;
650 memcpy(local->scan_ssid, ssid, ssid_len);
651 } else
652 local->scan_ssid_len = 0;
653 local->scan_state = SCAN_SET_CHANNEL; 511 local->scan_state = SCAN_SET_CHANNEL;
654 local->scan_channel_idx = 0; 512 local->scan_channel_idx = 0;
655 local->scan_band = IEEE80211_BAND_2GHZ;
656 local->scan_sdata = scan_sdata; 513 local->scan_sdata = scan_sdata;
514 local->scan_req = req;
657 515
658 netif_addr_lock_bh(local->mdev); 516 netif_addr_lock_bh(local->mdev);
659 local->filter_flags |= FIF_BCN_PRBRESP_PROMISC; 517 local->filter_flags |= FIF_BCN_PRBRESP_PROMISC;
@@ -673,13 +531,21 @@ int ieee80211_start_scan(struct ieee80211_sub_if_data *scan_sdata,
673 531
674 532
675int ieee80211_request_scan(struct ieee80211_sub_if_data *sdata, 533int ieee80211_request_scan(struct ieee80211_sub_if_data *sdata,
676 u8 *ssid, size_t ssid_len) 534 struct cfg80211_scan_request *req)
677{ 535{
678 struct ieee80211_local *local = sdata->local; 536 struct ieee80211_local *local = sdata->local;
679 struct ieee80211_if_sta *ifsta; 537 struct ieee80211_if_managed *ifmgd;
538
539 if (!req)
540 return -EINVAL;
541
542 if (local->scan_req && local->scan_req != req)
543 return -EBUSY;
544
545 local->scan_req = req;
680 546
681 if (sdata->vif.type != NL80211_IFTYPE_STATION) 547 if (sdata->vif.type != NL80211_IFTYPE_STATION)
682 return ieee80211_start_scan(sdata, ssid, ssid_len); 548 return ieee80211_start_scan(sdata, req);
683 549
684 /* 550 /*
685 * STA has a state machine that might need to defer scanning 551 * STA has a state machine that might need to defer scanning
@@ -693,242 +559,9 @@ int ieee80211_request_scan(struct ieee80211_sub_if_data *sdata,
693 return -EBUSY; 559 return -EBUSY;
694 } 560 }
695 561
696 ifsta = &sdata->u.sta; 562 ifmgd = &sdata->u.mgd;
697 563 set_bit(IEEE80211_STA_REQ_SCAN, &ifmgd->request);
698 ifsta->scan_ssid_len = ssid_len; 564 queue_work(local->hw.workqueue, &ifmgd->work);
699 if (ssid_len)
700 memcpy(ifsta->scan_ssid, ssid, ssid_len);
701 set_bit(IEEE80211_STA_REQ_SCAN, &ifsta->request);
702 queue_work(local->hw.workqueue, &ifsta->work);
703 565
704 return 0; 566 return 0;
705} 567}
706
707
708static void ieee80211_scan_add_ies(struct iw_request_info *info,
709 struct ieee80211_bss *bss,
710 char **current_ev, char *end_buf)
711{
712 u8 *pos, *end, *next;
713 struct iw_event iwe;
714
715 if (bss == NULL || bss->ies == NULL)
716 return;
717
718 /*
719 * If needed, fragment the IEs buffer (at IE boundaries) into short
720 * enough fragments to fit into IW_GENERIC_IE_MAX octet messages.
721 */
722 pos = bss->ies;
723 end = pos + bss->ies_len;
724
725 while (end - pos > IW_GENERIC_IE_MAX) {
726 next = pos + 2 + pos[1];
727 while (next + 2 + next[1] - pos < IW_GENERIC_IE_MAX)
728 next = next + 2 + next[1];
729
730 memset(&iwe, 0, sizeof(iwe));
731 iwe.cmd = IWEVGENIE;
732 iwe.u.data.length = next - pos;
733 *current_ev = iwe_stream_add_point(info, *current_ev,
734 end_buf, &iwe, pos);
735
736 pos = next;
737 }
738
739 if (end > pos) {
740 memset(&iwe, 0, sizeof(iwe));
741 iwe.cmd = IWEVGENIE;
742 iwe.u.data.length = end - pos;
743 *current_ev = iwe_stream_add_point(info, *current_ev,
744 end_buf, &iwe, pos);
745 }
746}
747
748
749static char *
750ieee80211_scan_result(struct ieee80211_local *local,
751 struct iw_request_info *info,
752 struct ieee80211_bss *bss,
753 char *current_ev, char *end_buf)
754{
755 struct iw_event iwe;
756 char *buf;
757
758 if (time_after(jiffies,
759 bss->last_update + IEEE80211_SCAN_RESULT_EXPIRE))
760 return current_ev;
761
762 memset(&iwe, 0, sizeof(iwe));
763 iwe.cmd = SIOCGIWAP;
764 iwe.u.ap_addr.sa_family = ARPHRD_ETHER;
765 memcpy(iwe.u.ap_addr.sa_data, bss->bssid, ETH_ALEN);
766 current_ev = iwe_stream_add_event(info, current_ev, end_buf, &iwe,
767 IW_EV_ADDR_LEN);
768
769 memset(&iwe, 0, sizeof(iwe));
770 iwe.cmd = SIOCGIWESSID;
771 if (bss_mesh_cfg(bss)) {
772 iwe.u.data.length = bss_mesh_id_len(bss);
773 iwe.u.data.flags = 1;
774 current_ev = iwe_stream_add_point(info, current_ev, end_buf,
775 &iwe, bss_mesh_id(bss));
776 } else {
777 iwe.u.data.length = bss->ssid_len;
778 iwe.u.data.flags = 1;
779 current_ev = iwe_stream_add_point(info, current_ev, end_buf,
780 &iwe, bss->ssid);
781 }
782
783 if (bss->capability & (WLAN_CAPABILITY_ESS | WLAN_CAPABILITY_IBSS)
784 || bss_mesh_cfg(bss)) {
785 memset(&iwe, 0, sizeof(iwe));
786 iwe.cmd = SIOCGIWMODE;
787 if (bss_mesh_cfg(bss))
788 iwe.u.mode = IW_MODE_MESH;
789 else if (bss->capability & WLAN_CAPABILITY_ESS)
790 iwe.u.mode = IW_MODE_MASTER;
791 else
792 iwe.u.mode = IW_MODE_ADHOC;
793 current_ev = iwe_stream_add_event(info, current_ev, end_buf,
794 &iwe, IW_EV_UINT_LEN);
795 }
796
797 memset(&iwe, 0, sizeof(iwe));
798 iwe.cmd = SIOCGIWFREQ;
799 iwe.u.freq.m = ieee80211_frequency_to_channel(bss->freq);
800 iwe.u.freq.e = 0;
801 current_ev = iwe_stream_add_event(info, current_ev, end_buf, &iwe,
802 IW_EV_FREQ_LEN);
803
804 memset(&iwe, 0, sizeof(iwe));
805 iwe.cmd = SIOCGIWFREQ;
806 iwe.u.freq.m = bss->freq;
807 iwe.u.freq.e = 6;
808 current_ev = iwe_stream_add_event(info, current_ev, end_buf, &iwe,
809 IW_EV_FREQ_LEN);
810 memset(&iwe, 0, sizeof(iwe));
811 iwe.cmd = IWEVQUAL;
812 iwe.u.qual.qual = bss->qual;
813 iwe.u.qual.level = bss->signal;
814 iwe.u.qual.noise = bss->noise;
815 iwe.u.qual.updated = local->wstats_flags;
816 current_ev = iwe_stream_add_event(info, current_ev, end_buf, &iwe,
817 IW_EV_QUAL_LEN);
818
819 memset(&iwe, 0, sizeof(iwe));
820 iwe.cmd = SIOCGIWENCODE;
821 if (bss->capability & WLAN_CAPABILITY_PRIVACY)
822 iwe.u.data.flags = IW_ENCODE_ENABLED | IW_ENCODE_NOKEY;
823 else
824 iwe.u.data.flags = IW_ENCODE_DISABLED;
825 iwe.u.data.length = 0;
826 current_ev = iwe_stream_add_point(info, current_ev, end_buf,
827 &iwe, "");
828
829 ieee80211_scan_add_ies(info, bss, &current_ev, end_buf);
830
831 if (bss->supp_rates_len > 0) {
832 /* display all supported rates in readable format */
833 char *p = current_ev + iwe_stream_lcp_len(info);
834 int i;
835
836 memset(&iwe, 0, sizeof(iwe));
837 iwe.cmd = SIOCGIWRATE;
838 /* Those two flags are ignored... */
839 iwe.u.bitrate.fixed = iwe.u.bitrate.disabled = 0;
840
841 for (i = 0; i < bss->supp_rates_len; i++) {
842 iwe.u.bitrate.value = ((bss->supp_rates[i] &
843 0x7f) * 500000);
844 p = iwe_stream_add_value(info, current_ev, p,
845 end_buf, &iwe, IW_EV_PARAM_LEN);
846 }
847 current_ev = p;
848 }
849
850 buf = kmalloc(30, GFP_ATOMIC);
851 if (buf) {
852 memset(&iwe, 0, sizeof(iwe));
853 iwe.cmd = IWEVCUSTOM;
854 sprintf(buf, "tsf=%016llx", (unsigned long long)(bss->timestamp));
855 iwe.u.data.length = strlen(buf);
856 current_ev = iwe_stream_add_point(info, current_ev, end_buf,
857 &iwe, buf);
858 memset(&iwe, 0, sizeof(iwe));
859 iwe.cmd = IWEVCUSTOM;
860 sprintf(buf, " Last beacon: %dms ago",
861 jiffies_to_msecs(jiffies - bss->last_update));
862 iwe.u.data.length = strlen(buf);
863 current_ev = iwe_stream_add_point(info, current_ev,
864 end_buf, &iwe, buf);
865 kfree(buf);
866 }
867
868 if (bss_mesh_cfg(bss)) {
869 u8 *cfg = bss_mesh_cfg(bss);
870 buf = kmalloc(50, GFP_ATOMIC);
871 if (buf) {
872 memset(&iwe, 0, sizeof(iwe));
873 iwe.cmd = IWEVCUSTOM;
874 sprintf(buf, "Mesh network (version %d)", cfg[0]);
875 iwe.u.data.length = strlen(buf);
876 current_ev = iwe_stream_add_point(info, current_ev,
877 end_buf,
878 &iwe, buf);
879 sprintf(buf, "Path Selection Protocol ID: "
880 "0x%02X%02X%02X%02X", cfg[1], cfg[2], cfg[3],
881 cfg[4]);
882 iwe.u.data.length = strlen(buf);
883 current_ev = iwe_stream_add_point(info, current_ev,
884 end_buf,
885 &iwe, buf);
886 sprintf(buf, "Path Selection Metric ID: "
887 "0x%02X%02X%02X%02X", cfg[5], cfg[6], cfg[7],
888 cfg[8]);
889 iwe.u.data.length = strlen(buf);
890 current_ev = iwe_stream_add_point(info, current_ev,
891 end_buf,
892 &iwe, buf);
893 sprintf(buf, "Congestion Control Mode ID: "
894 "0x%02X%02X%02X%02X", cfg[9], cfg[10],
895 cfg[11], cfg[12]);
896 iwe.u.data.length = strlen(buf);
897 current_ev = iwe_stream_add_point(info, current_ev,
898 end_buf,
899 &iwe, buf);
900 sprintf(buf, "Channel Precedence: "
901 "0x%02X%02X%02X%02X", cfg[13], cfg[14],
902 cfg[15], cfg[16]);
903 iwe.u.data.length = strlen(buf);
904 current_ev = iwe_stream_add_point(info, current_ev,
905 end_buf,
906 &iwe, buf);
907 kfree(buf);
908 }
909 }
910
911 return current_ev;
912}
913
914
915int ieee80211_scan_results(struct ieee80211_local *local,
916 struct iw_request_info *info,
917 char *buf, size_t len)
918{
919 char *current_ev = buf;
920 char *end_buf = buf + len;
921 struct ieee80211_bss *bss;
922
923 spin_lock_bh(&local->bss_lock);
924 list_for_each_entry(bss, &local->bss_list, list) {
925 if (buf + len - current_ev <= IW_EV_ADDR_LEN) {
926 spin_unlock_bh(&local->bss_lock);
927 return -E2BIG;
928 }
929 current_ev = ieee80211_scan_result(local, info, bss,
930 current_ev, end_buf);
931 }
932 spin_unlock_bh(&local->bss_lock);
933 return current_ev - buf;
934}
generated by cgit v1.2.2 (git 2.25.0) at 2025-01-14 04:04:45 -0500