1 // SPDX-License-Identifier: GPL-2.0
2 /*
3  * Intersil Prism2 driver with Host AP (software access point) support
4  * Copyright (c) 2001-2002, SSH Communications Security Corp and Jouni Malinen
5  * <j@w1.fi>
6  * Copyright (c) 2002-2005, Jouni Malinen <j@w1.fi>
7  *
8  * This file is to be included into hostap.c when S/W AP functionality is
9  * compiled.
10  *
11  * AP:  FIX:
12  * - if unicast Class 2 (assoc,reassoc,disassoc) frame received from
13  *   unauthenticated STA, send deauth. frame (8802.11: 5.5)
14  * - if unicast Class 3 (data with to/from DS,deauth,pspoll) frame received
15  *   from authenticated, but unassoc STA, send disassoc frame (8802.11: 5.5)
16  * - if unicast Class 3 received from unauthenticated STA, send deauth. frame
17  *   (8802.11: 5.5)
18  */
19 
20 #include <linux/proc_fs.h>
21 #include <linux/seq_file.h>
22 #include <linux/delay.h>
23 #include <linux/random.h>
24 #include <linux/if_arp.h>
25 #include <linux/slab.h>
26 #include <linux/export.h>
27 #include <linux/moduleparam.h>
28 #include <linux/etherdevice.h>
29 
30 #include "hostap_wlan.h"
31 #include "hostap.h"
32 #include "hostap_ap.h"
33 
34 static int other_ap_policy[MAX_PARM_DEVICES] = { AP_OTHER_AP_SKIP_ALL,
35 						 DEF_INTS };
36 module_param_array(other_ap_policy, int, NULL, 0444);
37 MODULE_PARM_DESC(other_ap_policy, "Other AP beacon monitoring policy (0-3)");
38 
39 static int ap_max_inactivity[MAX_PARM_DEVICES] = { AP_MAX_INACTIVITY_SEC,
40 						   DEF_INTS };
41 module_param_array(ap_max_inactivity, int, NULL, 0444);
42 MODULE_PARM_DESC(ap_max_inactivity, "AP timeout (in seconds) for station "
43 		 "inactivity");
44 
45 static int ap_bridge_packets[MAX_PARM_DEVICES] = { 1, DEF_INTS };
46 module_param_array(ap_bridge_packets, int, NULL, 0444);
47 MODULE_PARM_DESC(ap_bridge_packets, "Bridge packets directly between "
48 		 "stations");
49 
50 static int autom_ap_wds[MAX_PARM_DEVICES] = { 0, DEF_INTS };
51 module_param_array(autom_ap_wds, int, NULL, 0444);
52 MODULE_PARM_DESC(autom_ap_wds, "Add WDS connections to other APs "
53 		 "automatically");
54 
55 
56 static struct sta_info* ap_get_sta(struct ap_data *ap, u8 *sta);
57 static void hostap_event_expired_sta(struct net_device *dev,
58 				     struct sta_info *sta);
59 static void handle_add_proc_queue(struct work_struct *work);
60 
61 #ifndef PRISM2_NO_KERNEL_IEEE80211_MGMT
62 static void handle_wds_oper_queue(struct work_struct *work);
63 static void prism2_send_mgmt(struct net_device *dev,
64 			     u16 type_subtype, char *body,
65 			     int body_len, u8 *addr, u16 tx_cb_idx);
66 #endif /* PRISM2_NO_KERNEL_IEEE80211_MGMT */
67 
68 
69 #if !defined(PRISM2_NO_PROCFS_DEBUG) && defined(CONFIG_PROC_FS)
ap_debug_proc_show(struct seq_file * m,void * v)70 static int ap_debug_proc_show(struct seq_file *m, void *v)
71 {
72 	struct ap_data *ap = pde_data(file_inode(m->file));
73 
74 	seq_printf(m, "BridgedUnicastFrames=%u\n", ap->bridged_unicast);
75 	seq_printf(m, "BridgedMulticastFrames=%u\n", ap->bridged_multicast);
76 	seq_printf(m, "max_inactivity=%u\n", ap->max_inactivity / HZ);
77 	seq_printf(m, "bridge_packets=%u\n", ap->bridge_packets);
78 	seq_printf(m, "nullfunc_ack=%u\n", ap->nullfunc_ack);
79 	seq_printf(m, "autom_ap_wds=%u\n", ap->autom_ap_wds);
80 	seq_printf(m, "auth_algs=%u\n", ap->local->auth_algs);
81 	seq_printf(m, "tx_drop_nonassoc=%u\n", ap->tx_drop_nonassoc);
82 	return 0;
83 }
84 #endif
85 
ap_sta_hash_add(struct ap_data * ap,struct sta_info * sta)86 static void ap_sta_hash_add(struct ap_data *ap, struct sta_info *sta)
87 {
88 	sta->hnext = ap->sta_hash[STA_HASH(sta->addr)];
89 	ap->sta_hash[STA_HASH(sta->addr)] = sta;
90 }
91 
ap_sta_hash_del(struct ap_data * ap,struct sta_info * sta)92 static void ap_sta_hash_del(struct ap_data *ap, struct sta_info *sta)
93 {
94 	struct sta_info *s;
95 
96 	s = ap->sta_hash[STA_HASH(sta->addr)];
97 	if (s == NULL) return;
98 	if (ether_addr_equal(s->addr, sta->addr)) {
99 		ap->sta_hash[STA_HASH(sta->addr)] = s->hnext;
100 		return;
101 	}
102 
103 	while (s->hnext != NULL && !ether_addr_equal(s->hnext->addr, sta->addr))
104 		s = s->hnext;
105 	if (s->hnext != NULL)
106 		s->hnext = s->hnext->hnext;
107 	else
108 		printk("AP: could not remove STA %pM from hash table\n",
109 		       sta->addr);
110 }
111 
ap_free_sta(struct ap_data * ap,struct sta_info * sta)112 static void ap_free_sta(struct ap_data *ap, struct sta_info *sta)
113 {
114 	if (sta->ap && sta->local)
115 		hostap_event_expired_sta(sta->local->dev, sta);
116 
117 	if (ap->proc != NULL) {
118 		char name[20];
119 		sprintf(name, "%pM", sta->addr);
120 		remove_proc_entry(name, ap->proc);
121 	}
122 
123 	if (sta->crypt) {
124 		sta->crypt->ops->deinit(sta->crypt->priv);
125 		kfree(sta->crypt);
126 		sta->crypt = NULL;
127 	}
128 
129 	skb_queue_purge(&sta->tx_buf);
130 
131 	ap->num_sta--;
132 #ifndef PRISM2_NO_KERNEL_IEEE80211_MGMT
133 	if (sta->aid > 0)
134 		ap->sta_aid[sta->aid - 1] = NULL;
135 
136 	if (!sta->ap)
137 		kfree(sta->u.sta.challenge);
138 	timer_shutdown_sync(&sta->timer);
139 #endif /* PRISM2_NO_KERNEL_IEEE80211_MGMT */
140 
141 	kfree(sta);
142 }
143 
144 
hostap_set_tim(local_info_t * local,int aid,int set)145 static void hostap_set_tim(local_info_t *local, int aid, int set)
146 {
147 	if (local->func->set_tim)
148 		local->func->set_tim(local->dev, aid, set);
149 }
150 
151 
hostap_event_new_sta(struct net_device * dev,struct sta_info * sta)152 static void hostap_event_new_sta(struct net_device *dev, struct sta_info *sta)
153 {
154 	union iwreq_data wrqu;
155 	memset(&wrqu, 0, sizeof(wrqu));
156 	memcpy(wrqu.addr.sa_data, sta->addr, ETH_ALEN);
157 	wrqu.addr.sa_family = ARPHRD_ETHER;
158 	wireless_send_event(dev, IWEVREGISTERED, &wrqu, NULL);
159 }
160 
161 
hostap_event_expired_sta(struct net_device * dev,struct sta_info * sta)162 static void hostap_event_expired_sta(struct net_device *dev,
163 				     struct sta_info *sta)
164 {
165 	union iwreq_data wrqu;
166 	memset(&wrqu, 0, sizeof(wrqu));
167 	memcpy(wrqu.addr.sa_data, sta->addr, ETH_ALEN);
168 	wrqu.addr.sa_family = ARPHRD_ETHER;
169 	wireless_send_event(dev, IWEVEXPIRED, &wrqu, NULL);
170 }
171 
172 
173 #ifndef PRISM2_NO_KERNEL_IEEE80211_MGMT
174 
ap_handle_timer(struct timer_list * t)175 static void ap_handle_timer(struct timer_list *t)
176 {
177 	struct sta_info *sta = from_timer(sta, t, timer);
178 	local_info_t *local;
179 	struct ap_data *ap;
180 	unsigned long next_time = 0;
181 	int was_assoc;
182 
183 	if (sta == NULL || sta->local == NULL || sta->local->ap == NULL) {
184 		PDEBUG(DEBUG_AP, "ap_handle_timer() called with NULL data\n");
185 		return;
186 	}
187 
188 	local = sta->local;
189 	ap = local->ap;
190 	was_assoc = sta->flags & WLAN_STA_ASSOC;
191 
192 	if (atomic_read(&sta->users) != 0)
193 		next_time = jiffies + HZ;
194 	else if ((sta->flags & WLAN_STA_PERM) && !(sta->flags & WLAN_STA_AUTH))
195 		next_time = jiffies + ap->max_inactivity;
196 
197 	if (time_before(jiffies, sta->last_rx + ap->max_inactivity)) {
198 		/* station activity detected; reset timeout state */
199 		sta->timeout_next = STA_NULLFUNC;
200 		next_time = sta->last_rx + ap->max_inactivity;
201 	} else if (sta->timeout_next == STA_DISASSOC &&
202 		   !(sta->flags & WLAN_STA_PENDING_POLL)) {
203 		/* STA ACKed data nullfunc frame poll */
204 		sta->timeout_next = STA_NULLFUNC;
205 		next_time = jiffies + ap->max_inactivity;
206 	}
207 
208 	if (next_time) {
209 		sta->timer.expires = next_time;
210 		add_timer(&sta->timer);
211 		return;
212 	}
213 
214 	if (sta->ap)
215 		sta->timeout_next = STA_DEAUTH;
216 
217 	if (sta->timeout_next == STA_DEAUTH && !(sta->flags & WLAN_STA_PERM)) {
218 		spin_lock(&ap->sta_table_lock);
219 		ap_sta_hash_del(ap, sta);
220 		list_del(&sta->list);
221 		spin_unlock(&ap->sta_table_lock);
222 		sta->flags &= ~(WLAN_STA_AUTH | WLAN_STA_ASSOC);
223 	} else if (sta->timeout_next == STA_DISASSOC)
224 		sta->flags &= ~WLAN_STA_ASSOC;
225 
226 	if (was_assoc && !(sta->flags & WLAN_STA_ASSOC) && !sta->ap)
227 		hostap_event_expired_sta(local->dev, sta);
228 
229 	if (sta->timeout_next == STA_DEAUTH && sta->aid > 0 &&
230 	    !skb_queue_empty(&sta->tx_buf)) {
231 		hostap_set_tim(local, sta->aid, 0);
232 		sta->flags &= ~WLAN_STA_TIM;
233 	}
234 
235 	if (sta->ap) {
236 		if (ap->autom_ap_wds) {
237 			PDEBUG(DEBUG_AP, "%s: removing automatic WDS "
238 			       "connection to AP %pM\n",
239 			       local->dev->name, sta->addr);
240 			hostap_wds_link_oper(local, sta->addr, WDS_DEL);
241 		}
242 	} else if (sta->timeout_next == STA_NULLFUNC) {
243 		/* send data frame to poll STA and check whether this frame
244 		 * is ACKed */
245 		/* FIX: IEEE80211_STYPE_NULLFUNC would be more appropriate, but
246 		 * it is apparently not retried so TX Exc events are not
247 		 * received for it */
248 		sta->flags |= WLAN_STA_PENDING_POLL;
249 		prism2_send_mgmt(local->dev, IEEE80211_FTYPE_DATA |
250 				 IEEE80211_STYPE_DATA, NULL, 0,
251 				 sta->addr, ap->tx_callback_poll);
252 	} else {
253 		int deauth = sta->timeout_next == STA_DEAUTH;
254 		__le16 resp;
255 		PDEBUG(DEBUG_AP, "%s: sending %s info to STA %pM"
256 		       "(last=%lu, jiffies=%lu)\n",
257 		       local->dev->name,
258 		       deauth ? "deauthentication" : "disassociation",
259 		       sta->addr, sta->last_rx, jiffies);
260 
261 		resp = cpu_to_le16(deauth ? WLAN_REASON_PREV_AUTH_NOT_VALID :
262 				   WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY);
263 		prism2_send_mgmt(local->dev, IEEE80211_FTYPE_MGMT |
264 				 (deauth ? IEEE80211_STYPE_DEAUTH :
265 				  IEEE80211_STYPE_DISASSOC),
266 				 (char *) &resp, 2, sta->addr, 0);
267 	}
268 
269 	if (sta->timeout_next == STA_DEAUTH) {
270 		if (sta->flags & WLAN_STA_PERM) {
271 			PDEBUG(DEBUG_AP, "%s: STA %pM"
272 			       " would have been removed, "
273 			       "but it has 'perm' flag\n",
274 			       local->dev->name, sta->addr);
275 		} else
276 			ap_free_sta(ap, sta);
277 		return;
278 	}
279 
280 	if (sta->timeout_next == STA_NULLFUNC) {
281 		sta->timeout_next = STA_DISASSOC;
282 		sta->timer.expires = jiffies + AP_DISASSOC_DELAY;
283 	} else {
284 		sta->timeout_next = STA_DEAUTH;
285 		sta->timer.expires = jiffies + AP_DEAUTH_DELAY;
286 	}
287 
288 	add_timer(&sta->timer);
289 }
290 
291 
hostap_deauth_all_stas(struct net_device * dev,struct ap_data * ap,int resend)292 void hostap_deauth_all_stas(struct net_device *dev, struct ap_data *ap,
293 			    int resend)
294 {
295 	u8 addr[ETH_ALEN];
296 	__le16 resp;
297 	int i;
298 
299 	PDEBUG(DEBUG_AP, "%s: Deauthenticate all stations\n", dev->name);
300 	eth_broadcast_addr(addr);
301 
302 	resp = cpu_to_le16(WLAN_REASON_PREV_AUTH_NOT_VALID);
303 
304 	/* deauth message sent; try to resend it few times; the message is
305 	 * broadcast, so it may be delayed until next DTIM; there is not much
306 	 * else we can do at this point since the driver is going to be shut
307 	 * down */
308 	for (i = 0; i < 5; i++) {
309 		prism2_send_mgmt(dev, IEEE80211_FTYPE_MGMT |
310 				 IEEE80211_STYPE_DEAUTH,
311 				 (char *) &resp, 2, addr, 0);
312 
313 		if (!resend || ap->num_sta <= 0)
314 			return;
315 
316 		mdelay(50);
317 	}
318 }
319 
320 
ap_control_proc_show(struct seq_file * m,void * v)321 static int ap_control_proc_show(struct seq_file *m, void *v)
322 {
323 	struct ap_data *ap = pde_data(file_inode(m->file));
324 	char *policy_txt;
325 	struct mac_entry *entry;
326 
327 	if (v == SEQ_START_TOKEN) {
328 		switch (ap->mac_restrictions.policy) {
329 		case MAC_POLICY_OPEN:
330 			policy_txt = "open";
331 			break;
332 		case MAC_POLICY_ALLOW:
333 			policy_txt = "allow";
334 			break;
335 		case MAC_POLICY_DENY:
336 			policy_txt = "deny";
337 			break;
338 		default:
339 			policy_txt = "unknown";
340 			break;
341 		}
342 		seq_printf(m, "MAC policy: %s\n", policy_txt);
343 		seq_printf(m, "MAC entries: %u\n", ap->mac_restrictions.entries);
344 		seq_puts(m, "MAC list:\n");
345 		return 0;
346 	}
347 
348 	entry = v;
349 	seq_printf(m, "%pM\n", entry->addr);
350 	return 0;
351 }
352 
ap_control_proc_start(struct seq_file * m,loff_t * _pos)353 static void *ap_control_proc_start(struct seq_file *m, loff_t *_pos)
354 {
355 	struct ap_data *ap = pde_data(file_inode(m->file));
356 	spin_lock_bh(&ap->mac_restrictions.lock);
357 	return seq_list_start_head(&ap->mac_restrictions.mac_list, *_pos);
358 }
359 
ap_control_proc_next(struct seq_file * m,void * v,loff_t * _pos)360 static void *ap_control_proc_next(struct seq_file *m, void *v, loff_t *_pos)
361 {
362 	struct ap_data *ap = pde_data(file_inode(m->file));
363 	return seq_list_next(v, &ap->mac_restrictions.mac_list, _pos);
364 }
365 
ap_control_proc_stop(struct seq_file * m,void * v)366 static void ap_control_proc_stop(struct seq_file *m, void *v)
367 {
368 	struct ap_data *ap = pde_data(file_inode(m->file));
369 	spin_unlock_bh(&ap->mac_restrictions.lock);
370 }
371 
372 static const struct seq_operations ap_control_proc_seqops = {
373 	.start	= ap_control_proc_start,
374 	.next	= ap_control_proc_next,
375 	.stop	= ap_control_proc_stop,
376 	.show	= ap_control_proc_show,
377 };
378 
ap_control_add_mac(struct mac_restrictions * mac_restrictions,u8 * mac)379 int ap_control_add_mac(struct mac_restrictions *mac_restrictions, u8 *mac)
380 {
381 	struct mac_entry *entry;
382 
383 	entry = kmalloc(sizeof(struct mac_entry), GFP_KERNEL);
384 	if (entry == NULL)
385 		return -ENOMEM;
386 
387 	memcpy(entry->addr, mac, ETH_ALEN);
388 
389 	spin_lock_bh(&mac_restrictions->lock);
390 	list_add_tail(&entry->list, &mac_restrictions->mac_list);
391 	mac_restrictions->entries++;
392 	spin_unlock_bh(&mac_restrictions->lock);
393 
394 	return 0;
395 }
396 
397 
ap_control_del_mac(struct mac_restrictions * mac_restrictions,u8 * mac)398 int ap_control_del_mac(struct mac_restrictions *mac_restrictions, u8 *mac)
399 {
400 	struct list_head *ptr;
401 	struct mac_entry *entry;
402 
403 	spin_lock_bh(&mac_restrictions->lock);
404 	for (ptr = mac_restrictions->mac_list.next;
405 	     ptr != &mac_restrictions->mac_list; ptr = ptr->next) {
406 		entry = list_entry(ptr, struct mac_entry, list);
407 
408 		if (ether_addr_equal(entry->addr, mac)) {
409 			list_del(ptr);
410 			kfree(entry);
411 			mac_restrictions->entries--;
412 			spin_unlock_bh(&mac_restrictions->lock);
413 			return 0;
414 		}
415 	}
416 	spin_unlock_bh(&mac_restrictions->lock);
417 	return -1;
418 }
419 
420 
ap_control_mac_deny(struct mac_restrictions * mac_restrictions,u8 * mac)421 static int ap_control_mac_deny(struct mac_restrictions *mac_restrictions,
422 			       u8 *mac)
423 {
424 	struct mac_entry *entry;
425 	int found = 0;
426 
427 	if (mac_restrictions->policy == MAC_POLICY_OPEN)
428 		return 0;
429 
430 	spin_lock_bh(&mac_restrictions->lock);
431 	list_for_each_entry(entry, &mac_restrictions->mac_list, list) {
432 		if (ether_addr_equal(entry->addr, mac)) {
433 			found = 1;
434 			break;
435 		}
436 	}
437 	spin_unlock_bh(&mac_restrictions->lock);
438 
439 	if (mac_restrictions->policy == MAC_POLICY_ALLOW)
440 		return !found;
441 	else
442 		return found;
443 }
444 
445 
ap_control_flush_macs(struct mac_restrictions * mac_restrictions)446 void ap_control_flush_macs(struct mac_restrictions *mac_restrictions)
447 {
448 	struct list_head *ptr, *n;
449 	struct mac_entry *entry;
450 
451 	if (mac_restrictions->entries == 0)
452 		return;
453 
454 	spin_lock_bh(&mac_restrictions->lock);
455 	for (ptr = mac_restrictions->mac_list.next, n = ptr->next;
456 	     ptr != &mac_restrictions->mac_list;
457 	     ptr = n, n = ptr->next) {
458 		entry = list_entry(ptr, struct mac_entry, list);
459 		list_del(ptr);
460 		kfree(entry);
461 	}
462 	mac_restrictions->entries = 0;
463 	spin_unlock_bh(&mac_restrictions->lock);
464 }
465 
466 
ap_control_kick_mac(struct ap_data * ap,struct net_device * dev,u8 * mac)467 int ap_control_kick_mac(struct ap_data *ap, struct net_device *dev, u8 *mac)
468 {
469 	struct sta_info *sta;
470 	__le16 resp;
471 
472 	spin_lock_bh(&ap->sta_table_lock);
473 	sta = ap_get_sta(ap, mac);
474 	if (sta) {
475 		ap_sta_hash_del(ap, sta);
476 		list_del(&sta->list);
477 	}
478 	spin_unlock_bh(&ap->sta_table_lock);
479 
480 	if (!sta)
481 		return -EINVAL;
482 
483 	resp = cpu_to_le16(WLAN_REASON_PREV_AUTH_NOT_VALID);
484 	prism2_send_mgmt(dev, IEEE80211_FTYPE_MGMT | IEEE80211_STYPE_DEAUTH,
485 			 (char *) &resp, 2, sta->addr, 0);
486 
487 	if ((sta->flags & WLAN_STA_ASSOC) && !sta->ap)
488 		hostap_event_expired_sta(dev, sta);
489 
490 	ap_free_sta(ap, sta);
491 
492 	return 0;
493 }
494 
495 #endif /* PRISM2_NO_KERNEL_IEEE80211_MGMT */
496 
497 
ap_control_kickall(struct ap_data * ap)498 void ap_control_kickall(struct ap_data *ap)
499 {
500 	struct list_head *ptr, *n;
501 	struct sta_info *sta;
502 
503 	spin_lock_bh(&ap->sta_table_lock);
504 	for (ptr = ap->sta_list.next, n = ptr->next; ptr != &ap->sta_list;
505 	     ptr = n, n = ptr->next) {
506 		sta = list_entry(ptr, struct sta_info, list);
507 		ap_sta_hash_del(ap, sta);
508 		list_del(&sta->list);
509 		if ((sta->flags & WLAN_STA_ASSOC) && !sta->ap && sta->local)
510 			hostap_event_expired_sta(sta->local->dev, sta);
511 		ap_free_sta(ap, sta);
512 	}
513 	spin_unlock_bh(&ap->sta_table_lock);
514 }
515 
516 
517 #ifndef PRISM2_NO_KERNEL_IEEE80211_MGMT
518 
prism2_ap_proc_show(struct seq_file * m,void * v)519 static int prism2_ap_proc_show(struct seq_file *m, void *v)
520 {
521 	struct sta_info *sta = v;
522 	int i;
523 
524 	if (v == SEQ_START_TOKEN) {
525 		seq_printf(m, "# BSSID CHAN SIGNAL NOISE RATE SSID FLAGS\n");
526 		return 0;
527 	}
528 
529 	if (!sta->ap)
530 		return 0;
531 
532 	seq_printf(m, "%pM %d %d %d %d '",
533 		   sta->addr,
534 		   sta->u.ap.channel, sta->last_rx_signal,
535 		   sta->last_rx_silence, sta->last_rx_rate);
536 
537 	for (i = 0; i < sta->u.ap.ssid_len; i++) {
538 		if (sta->u.ap.ssid[i] >= 32 && sta->u.ap.ssid[i] < 127)
539 			seq_putc(m, sta->u.ap.ssid[i]);
540 		else
541 			seq_printf(m, "<%02x>", sta->u.ap.ssid[i]);
542 	}
543 
544 	seq_putc(m, '\'');
545 	if (sta->capability & WLAN_CAPABILITY_ESS)
546 		seq_puts(m, " [ESS]");
547 	if (sta->capability & WLAN_CAPABILITY_IBSS)
548 		seq_puts(m, " [IBSS]");
549 	if (sta->capability & WLAN_CAPABILITY_PRIVACY)
550 		seq_puts(m, " [WEP]");
551 	seq_putc(m, '\n');
552 	return 0;
553 }
554 
prism2_ap_proc_start(struct seq_file * m,loff_t * _pos)555 static void *prism2_ap_proc_start(struct seq_file *m, loff_t *_pos)
556 {
557 	struct ap_data *ap = pde_data(file_inode(m->file));
558 	spin_lock_bh(&ap->sta_table_lock);
559 	return seq_list_start_head(&ap->sta_list, *_pos);
560 }
561 
prism2_ap_proc_next(struct seq_file * m,void * v,loff_t * _pos)562 static void *prism2_ap_proc_next(struct seq_file *m, void *v, loff_t *_pos)
563 {
564 	struct ap_data *ap = pde_data(file_inode(m->file));
565 	return seq_list_next(v, &ap->sta_list, _pos);
566 }
567 
prism2_ap_proc_stop(struct seq_file * m,void * v)568 static void prism2_ap_proc_stop(struct seq_file *m, void *v)
569 {
570 	struct ap_data *ap = pde_data(file_inode(m->file));
571 	spin_unlock_bh(&ap->sta_table_lock);
572 }
573 
574 static const struct seq_operations prism2_ap_proc_seqops = {
575 	.start	= prism2_ap_proc_start,
576 	.next	= prism2_ap_proc_next,
577 	.stop	= prism2_ap_proc_stop,
578 	.show	= prism2_ap_proc_show,
579 };
580 #endif /* PRISM2_NO_KERNEL_IEEE80211_MGMT */
581 
582 
hostap_check_sta_fw_version(struct ap_data * ap,int sta_fw_ver)583 void hostap_check_sta_fw_version(struct ap_data *ap, int sta_fw_ver)
584 {
585 	if (!ap)
586 		return;
587 
588 	if (sta_fw_ver == PRISM2_FW_VER(0,8,0)) {
589 		PDEBUG(DEBUG_AP, "Using data::nullfunc ACK workaround - "
590 		       "firmware upgrade recommended\n");
591 		ap->nullfunc_ack = 1;
592 	} else
593 		ap->nullfunc_ack = 0;
594 
595 	if (sta_fw_ver == PRISM2_FW_VER(1,4,2)) {
596 		printk(KERN_WARNING "%s: Warning: secondary station firmware "
597 		       "version 1.4.2 does not seem to work in Host AP mode\n",
598 		       ap->local->dev->name);
599 	}
600 }
601 
602 
603 /* Called only as a tasklet (software IRQ) */
hostap_ap_tx_cb(struct sk_buff * skb,int ok,void * data)604 static void hostap_ap_tx_cb(struct sk_buff *skb, int ok, void *data)
605 {
606 	struct ap_data *ap = data;
607 	struct ieee80211_hdr *hdr;
608 
609 	if (!ap->local->hostapd || !ap->local->apdev) {
610 		dev_kfree_skb(skb);
611 		return;
612 	}
613 
614 	/* Pass the TX callback frame to the hostapd; use 802.11 header version
615 	 * 1 to indicate failure (no ACK) and 2 success (frame ACKed) */
616 
617 	hdr = (struct ieee80211_hdr *) skb->data;
618 	hdr->frame_control &= cpu_to_le16(~IEEE80211_FCTL_VERS);
619 	hdr->frame_control |= cpu_to_le16(ok ? BIT(1) : BIT(0));
620 
621 	skb->dev = ap->local->apdev;
622 	skb_pull(skb, hostap_80211_get_hdrlen(hdr->frame_control));
623 	skb->pkt_type = PACKET_OTHERHOST;
624 	skb->protocol = cpu_to_be16(ETH_P_802_2);
625 	memset(skb->cb, 0, sizeof(skb->cb));
626 	netif_rx(skb);
627 }
628 
629 
630 #ifndef PRISM2_NO_KERNEL_IEEE80211_MGMT
631 /* Called only as a tasklet (software IRQ) */
hostap_ap_tx_cb_auth(struct sk_buff * skb,int ok,void * data)632 static void hostap_ap_tx_cb_auth(struct sk_buff *skb, int ok, void *data)
633 {
634 	struct ap_data *ap = data;
635 	struct net_device *dev = ap->local->dev;
636 	struct ieee80211_hdr *hdr;
637 	u16 auth_alg, auth_transaction, status;
638 	__le16 *pos;
639 	struct sta_info *sta = NULL;
640 	char *txt = NULL;
641 
642 	if (ap->local->hostapd) {
643 		dev_kfree_skb(skb);
644 		return;
645 	}
646 
647 	hdr = (struct ieee80211_hdr *) skb->data;
648 	if (!ieee80211_is_auth(hdr->frame_control) ||
649 	    skb->len < IEEE80211_MGMT_HDR_LEN + 6) {
650 		printk(KERN_DEBUG "%s: hostap_ap_tx_cb_auth received invalid "
651 		       "frame\n", dev->name);
652 		dev_kfree_skb(skb);
653 		return;
654 	}
655 
656 	pos = (__le16 *) (skb->data + IEEE80211_MGMT_HDR_LEN);
657 	auth_alg = le16_to_cpu(*pos++);
658 	auth_transaction = le16_to_cpu(*pos++);
659 	status = le16_to_cpu(*pos++);
660 
661 	if (!ok) {
662 		txt = "frame was not ACKed";
663 		goto done;
664 	}
665 
666 	spin_lock(&ap->sta_table_lock);
667 	sta = ap_get_sta(ap, hdr->addr1);
668 	if (sta)
669 		atomic_inc(&sta->users);
670 	spin_unlock(&ap->sta_table_lock);
671 
672 	if (!sta) {
673 		txt = "STA not found";
674 		goto done;
675 	}
676 
677 	if (status == WLAN_STATUS_SUCCESS &&
678 	    ((auth_alg == WLAN_AUTH_OPEN && auth_transaction == 2) ||
679 	     (auth_alg == WLAN_AUTH_SHARED_KEY && auth_transaction == 4))) {
680 		txt = "STA authenticated";
681 		sta->flags |= WLAN_STA_AUTH;
682 		sta->last_auth = jiffies;
683 	} else if (status != WLAN_STATUS_SUCCESS)
684 		txt = "authentication failed";
685 
686  done:
687 	if (sta)
688 		atomic_dec(&sta->users);
689 	if (txt) {
690 		PDEBUG(DEBUG_AP, "%s: %pM auth_cb - alg=%d "
691 		       "trans#=%d status=%d - %s\n",
692 		       dev->name, hdr->addr1,
693 		       auth_alg, auth_transaction, status, txt);
694 	}
695 	dev_kfree_skb(skb);
696 }
697 
698 
699 /* Called only as a tasklet (software IRQ) */
hostap_ap_tx_cb_assoc(struct sk_buff * skb,int ok,void * data)700 static void hostap_ap_tx_cb_assoc(struct sk_buff *skb, int ok, void *data)
701 {
702 	struct ap_data *ap = data;
703 	struct net_device *dev = ap->local->dev;
704 	struct ieee80211_hdr *hdr;
705 	u16 status;
706 	__le16 *pos;
707 	struct sta_info *sta = NULL;
708 	char *txt = NULL;
709 
710 	if (ap->local->hostapd) {
711 		dev_kfree_skb(skb);
712 		return;
713 	}
714 
715 	hdr = (struct ieee80211_hdr *) skb->data;
716 	if ((!ieee80211_is_assoc_resp(hdr->frame_control) &&
717 	     !ieee80211_is_reassoc_resp(hdr->frame_control)) ||
718 	    skb->len < IEEE80211_MGMT_HDR_LEN + 4) {
719 		printk(KERN_DEBUG "%s: hostap_ap_tx_cb_assoc received invalid "
720 		       "frame\n", dev->name);
721 		dev_kfree_skb(skb);
722 		return;
723 	}
724 
725 	if (!ok) {
726 		txt = "frame was not ACKed";
727 		goto done;
728 	}
729 
730 	spin_lock(&ap->sta_table_lock);
731 	sta = ap_get_sta(ap, hdr->addr1);
732 	if (sta)
733 		atomic_inc(&sta->users);
734 	spin_unlock(&ap->sta_table_lock);
735 
736 	if (!sta) {
737 		txt = "STA not found";
738 		goto done;
739 	}
740 
741 	pos = (__le16 *) (skb->data + IEEE80211_MGMT_HDR_LEN);
742 	pos++;
743 	status = le16_to_cpu(*pos++);
744 	if (status == WLAN_STATUS_SUCCESS) {
745 		if (!(sta->flags & WLAN_STA_ASSOC))
746 			hostap_event_new_sta(dev, sta);
747 		txt = "STA associated";
748 		sta->flags |= WLAN_STA_ASSOC;
749 		sta->last_assoc = jiffies;
750 	} else
751 		txt = "association failed";
752 
753  done:
754 	if (sta)
755 		atomic_dec(&sta->users);
756 	if (txt) {
757 		PDEBUG(DEBUG_AP, "%s: %pM assoc_cb - %s\n",
758 		       dev->name, hdr->addr1, txt);
759 	}
760 	dev_kfree_skb(skb);
761 }
762 
763 /* Called only as a tasklet (software IRQ); TX callback for poll frames used
764  * in verifying whether the STA is still present. */
hostap_ap_tx_cb_poll(struct sk_buff * skb,int ok,void * data)765 static void hostap_ap_tx_cb_poll(struct sk_buff *skb, int ok, void *data)
766 {
767 	struct ap_data *ap = data;
768 	struct ieee80211_hdr *hdr;
769 	struct sta_info *sta;
770 
771 	if (skb->len < 24)
772 		goto fail;
773 	hdr = (struct ieee80211_hdr *) skb->data;
774 	if (ok) {
775 		spin_lock(&ap->sta_table_lock);
776 		sta = ap_get_sta(ap, hdr->addr1);
777 		if (sta)
778 			sta->flags &= ~WLAN_STA_PENDING_POLL;
779 		spin_unlock(&ap->sta_table_lock);
780 	} else {
781 		PDEBUG(DEBUG_AP,
782 		       "%s: STA %pM did not ACK activity poll frame\n",
783 		       ap->local->dev->name, hdr->addr1);
784 	}
785 
786  fail:
787 	dev_kfree_skb(skb);
788 }
789 #endif /* PRISM2_NO_KERNEL_IEEE80211_MGMT */
790 
791 
hostap_init_data(local_info_t * local)792 void hostap_init_data(local_info_t *local)
793 {
794 	struct ap_data *ap = local->ap;
795 
796 	if (ap == NULL) {
797 		printk(KERN_WARNING "hostap_init_data: ap == NULL\n");
798 		return;
799 	}
800 	memset(ap, 0, sizeof(struct ap_data));
801 	ap->local = local;
802 
803 	ap->ap_policy = GET_INT_PARM(other_ap_policy, local->card_idx);
804 	ap->bridge_packets = GET_INT_PARM(ap_bridge_packets, local->card_idx);
805 	ap->max_inactivity =
806 		GET_INT_PARM(ap_max_inactivity, local->card_idx) * HZ;
807 	ap->autom_ap_wds = GET_INT_PARM(autom_ap_wds, local->card_idx);
808 
809 	spin_lock_init(&ap->sta_table_lock);
810 	INIT_LIST_HEAD(&ap->sta_list);
811 
812 	/* Initialize task queue structure for AP management */
813 	INIT_WORK(&local->ap->add_sta_proc_queue, handle_add_proc_queue);
814 
815 	ap->tx_callback_idx =
816 		hostap_tx_callback_register(local, hostap_ap_tx_cb, ap);
817 	if (ap->tx_callback_idx == 0)
818 		printk(KERN_WARNING "%s: failed to register TX callback for "
819 		       "AP\n", local->dev->name);
820 #ifndef PRISM2_NO_KERNEL_IEEE80211_MGMT
821 	INIT_WORK(&local->ap->wds_oper_queue, handle_wds_oper_queue);
822 
823 	ap->tx_callback_auth =
824 		hostap_tx_callback_register(local, hostap_ap_tx_cb_auth, ap);
825 	ap->tx_callback_assoc =
826 		hostap_tx_callback_register(local, hostap_ap_tx_cb_assoc, ap);
827 	ap->tx_callback_poll =
828 		hostap_tx_callback_register(local, hostap_ap_tx_cb_poll, ap);
829 	if (ap->tx_callback_auth == 0 || ap->tx_callback_assoc == 0 ||
830 		ap->tx_callback_poll == 0)
831 		printk(KERN_WARNING "%s: failed to register TX callback for "
832 		       "AP\n", local->dev->name);
833 
834 	spin_lock_init(&ap->mac_restrictions.lock);
835 	INIT_LIST_HEAD(&ap->mac_restrictions.mac_list);
836 #endif /* PRISM2_NO_KERNEL_IEEE80211_MGMT */
837 
838 	ap->initialized = 1;
839 }
840 
841 
hostap_init_ap_proc(local_info_t * local)842 void hostap_init_ap_proc(local_info_t *local)
843 {
844 	struct ap_data *ap = local->ap;
845 
846 	ap->proc = local->proc;
847 	if (ap->proc == NULL)
848 		return;
849 
850 #ifndef PRISM2_NO_PROCFS_DEBUG
851 	proc_create_single_data("ap_debug", 0, ap->proc, ap_debug_proc_show, ap);
852 #endif /* PRISM2_NO_PROCFS_DEBUG */
853 
854 #ifndef PRISM2_NO_KERNEL_IEEE80211_MGMT
855 	proc_create_seq_data("ap_control", 0, ap->proc, &ap_control_proc_seqops,
856 			ap);
857 	proc_create_seq_data("ap", 0, ap->proc, &prism2_ap_proc_seqops, ap);
858 #endif /* PRISM2_NO_KERNEL_IEEE80211_MGMT */
859 
860 }
861 
862 
hostap_free_data(struct ap_data * ap)863 void hostap_free_data(struct ap_data *ap)
864 {
865 	struct sta_info *n, *sta;
866 
867 	if (ap == NULL || !ap->initialized) {
868 		printk(KERN_DEBUG "hostap_free_data: ap has not yet been "
869 		       "initialized - skip resource freeing\n");
870 		return;
871 	}
872 
873 	flush_work(&ap->add_sta_proc_queue);
874 
875 #ifndef PRISM2_NO_KERNEL_IEEE80211_MGMT
876 	flush_work(&ap->wds_oper_queue);
877 	if (ap->crypt)
878 		ap->crypt->deinit(ap->crypt_priv);
879 	ap->crypt = ap->crypt_priv = NULL;
880 #endif /* PRISM2_NO_KERNEL_IEEE80211_MGMT */
881 
882 	list_for_each_entry_safe(sta, n, &ap->sta_list, list) {
883 		ap_sta_hash_del(ap, sta);
884 		list_del(&sta->list);
885 		if ((sta->flags & WLAN_STA_ASSOC) && !sta->ap && sta->local)
886 			hostap_event_expired_sta(sta->local->dev, sta);
887 		ap_free_sta(ap, sta);
888 	}
889 
890 #ifndef PRISM2_NO_PROCFS_DEBUG
891 	if (ap->proc != NULL) {
892 		remove_proc_entry("ap_debug", ap->proc);
893 	}
894 #endif /* PRISM2_NO_PROCFS_DEBUG */
895 
896 #ifndef PRISM2_NO_KERNEL_IEEE80211_MGMT
897 	if (ap->proc != NULL) {
898 	  remove_proc_entry("ap", ap->proc);
899 		remove_proc_entry("ap_control", ap->proc);
900 	}
901 	ap_control_flush_macs(&ap->mac_restrictions);
902 #endif /* PRISM2_NO_KERNEL_IEEE80211_MGMT */
903 
904 	ap->initialized = 0;
905 }
906 
907 
908 /* caller should have mutex for AP STA list handling */
ap_get_sta(struct ap_data * ap,u8 * sta)909 static struct sta_info* ap_get_sta(struct ap_data *ap, u8 *sta)
910 {
911 	struct sta_info *s;
912 
913 	s = ap->sta_hash[STA_HASH(sta)];
914 	while (s != NULL && !ether_addr_equal(s->addr, sta))
915 		s = s->hnext;
916 	return s;
917 }
918 
919 
920 #ifndef PRISM2_NO_KERNEL_IEEE80211_MGMT
921 
922 /* Called from timer handler and from scheduled AP queue handlers */
prism2_send_mgmt(struct net_device * dev,u16 type_subtype,char * body,int body_len,u8 * addr,u16 tx_cb_idx)923 static void prism2_send_mgmt(struct net_device *dev,
924 			     u16 type_subtype, char *body,
925 			     int body_len, u8 *addr, u16 tx_cb_idx)
926 {
927 	struct hostap_interface *iface;
928 	local_info_t *local;
929 	struct ieee80211_hdr *hdr;
930 	u16 fc;
931 	struct sk_buff *skb;
932 	struct hostap_skb_tx_data *meta;
933 	int hdrlen;
934 
935 	iface = netdev_priv(dev);
936 	local = iface->local;
937 	dev = local->dev; /* always use master radio device */
938 	iface = netdev_priv(dev);
939 
940 	if (!(dev->flags & IFF_UP)) {
941 		PDEBUG(DEBUG_AP, "%s: prism2_send_mgmt - device is not UP - "
942 		       "cannot send frame\n", dev->name);
943 		return;
944 	}
945 
946 	skb = dev_alloc_skb(sizeof(*hdr) + body_len);
947 	if (skb == NULL) {
948 		PDEBUG(DEBUG_AP, "%s: prism2_send_mgmt failed to allocate "
949 		       "skb\n", dev->name);
950 		return;
951 	}
952 
953 	fc = type_subtype;
954 	hdrlen = hostap_80211_get_hdrlen(cpu_to_le16(type_subtype));
955 	hdr = skb_put_zero(skb, hdrlen);
956 	if (body)
957 		skb_put_data(skb, body, body_len);
958 
959 	/* FIX: ctrl::ack sending used special HFA384X_TX_CTRL_802_11
960 	 * tx_control instead of using local->tx_control */
961 
962 
963 	memcpy(hdr->addr1, addr, ETH_ALEN); /* DA / RA */
964 	if (ieee80211_is_data(hdr->frame_control)) {
965 		fc |= IEEE80211_FCTL_FROMDS;
966 		memcpy(hdr->addr2, dev->dev_addr, ETH_ALEN); /* BSSID */
967 		memcpy(hdr->addr3, dev->dev_addr, ETH_ALEN); /* SA */
968 	} else if (ieee80211_is_ctl(hdr->frame_control)) {
969 		/* control:ACK does not have addr2 or addr3 */
970 		eth_zero_addr(hdr->addr2);
971 		eth_zero_addr(hdr->addr3);
972 	} else {
973 		memcpy(hdr->addr2, dev->dev_addr, ETH_ALEN); /* SA */
974 		memcpy(hdr->addr3, dev->dev_addr, ETH_ALEN); /* BSSID */
975 	}
976 
977 	hdr->frame_control = cpu_to_le16(fc);
978 
979 	meta = (struct hostap_skb_tx_data *) skb->cb;
980 	memset(meta, 0, sizeof(*meta));
981 	meta->magic = HOSTAP_SKB_TX_DATA_MAGIC;
982 	meta->iface = iface;
983 	meta->tx_cb_idx = tx_cb_idx;
984 
985 	skb->dev = dev;
986 	skb_reset_mac_header(skb);
987 	skb_reset_network_header(skb);
988 	dev_queue_xmit(skb);
989 }
990 #endif /* PRISM2_NO_KERNEL_IEEE80211_MGMT */
991 
992 #ifdef CONFIG_PROC_FS
prism2_sta_proc_show(struct seq_file * m,void * v)993 static int prism2_sta_proc_show(struct seq_file *m, void *v)
994 {
995 	struct sta_info *sta = m->private;
996 	int i;
997 
998 	/* FIX: possible race condition.. the STA data could have just expired,
999 	 * but proc entry was still here so that the read could have started;
1000 	 * some locking should be done here.. */
1001 
1002 	seq_printf(m,
1003 		   "%s=%pM\nusers=%d\naid=%d\n"
1004 		   "flags=0x%04x%s%s%s%s%s%s%s\n"
1005 		   "capability=0x%02x\nlisten_interval=%d\nsupported_rates=",
1006 		   sta->ap ? "AP" : "STA",
1007 		   sta->addr, atomic_read(&sta->users), sta->aid,
1008 		   sta->flags,
1009 		   sta->flags & WLAN_STA_AUTH ? " AUTH" : "",
1010 		   sta->flags & WLAN_STA_ASSOC ? " ASSOC" : "",
1011 		   sta->flags & WLAN_STA_PS ? " PS" : "",
1012 		   sta->flags & WLAN_STA_TIM ? " TIM" : "",
1013 		   sta->flags & WLAN_STA_PERM ? " PERM" : "",
1014 		   sta->flags & WLAN_STA_AUTHORIZED ? " AUTHORIZED" : "",
1015 		   sta->flags & WLAN_STA_PENDING_POLL ? " POLL" : "",
1016 		   sta->capability, sta->listen_interval);
1017 	/* supported_rates: 500 kbit/s units with msb ignored */
1018 	for (i = 0; i < sizeof(sta->supported_rates); i++)
1019 		if (sta->supported_rates[i] != 0)
1020 			seq_printf(m, "%d%sMbps ",
1021 				   (sta->supported_rates[i] & 0x7f) / 2,
1022 				   sta->supported_rates[i] & 1 ? ".5" : "");
1023 	seq_printf(m,
1024 		   "\njiffies=%lu\nlast_auth=%lu\nlast_assoc=%lu\n"
1025 		   "last_rx=%lu\nlast_tx=%lu\nrx_packets=%lu\n"
1026 		   "tx_packets=%lu\n"
1027 		   "rx_bytes=%lu\ntx_bytes=%lu\nbuffer_count=%d\n"
1028 		   "last_rx: silence=%d dBm signal=%d dBm rate=%d%s Mbps\n"
1029 		   "tx_rate=%d\ntx[1M]=%d\ntx[2M]=%d\ntx[5.5M]=%d\n"
1030 		   "tx[11M]=%d\n"
1031 		   "rx[1M]=%d\nrx[2M]=%d\nrx[5.5M]=%d\nrx[11M]=%d\n",
1032 		   jiffies, sta->last_auth, sta->last_assoc, sta->last_rx,
1033 		   sta->last_tx,
1034 		   sta->rx_packets, sta->tx_packets, sta->rx_bytes,
1035 		   sta->tx_bytes, skb_queue_len(&sta->tx_buf),
1036 		   sta->last_rx_silence,
1037 		   sta->last_rx_signal, sta->last_rx_rate / 10,
1038 		   sta->last_rx_rate % 10 ? ".5" : "",
1039 		   sta->tx_rate, sta->tx_count[0], sta->tx_count[1],
1040 		   sta->tx_count[2], sta->tx_count[3],  sta->rx_count[0],
1041 		   sta->rx_count[1], sta->rx_count[2], sta->rx_count[3]);
1042 	if (sta->crypt && sta->crypt->ops && sta->crypt->ops->print_stats)
1043 		sta->crypt->ops->print_stats(m, sta->crypt->priv);
1044 #ifndef PRISM2_NO_KERNEL_IEEE80211_MGMT
1045 	if (sta->ap) {
1046 		if (sta->u.ap.channel >= 0)
1047 			seq_printf(m, "channel=%d\n", sta->u.ap.channel);
1048 		seq_puts(m, "ssid=");
1049 		for (i = 0; i < sta->u.ap.ssid_len; i++) {
1050 			if (sta->u.ap.ssid[i] >= 32 && sta->u.ap.ssid[i] < 127)
1051 				seq_putc(m, sta->u.ap.ssid[i]);
1052 			else
1053 				seq_printf(m, "<%02x>", sta->u.ap.ssid[i]);
1054 		}
1055 		seq_putc(m, '\n');
1056 	}
1057 #endif /* PRISM2_NO_KERNEL_IEEE80211_MGMT */
1058 
1059 	return 0;
1060 }
1061 #endif
1062 
handle_add_proc_queue(struct work_struct * work)1063 static void handle_add_proc_queue(struct work_struct *work)
1064 {
1065 	struct ap_data *ap = container_of(work, struct ap_data,
1066 					  add_sta_proc_queue);
1067 	struct sta_info *sta;
1068 	char name[20];
1069 	struct add_sta_proc_data *entry, *prev;
1070 
1071 	entry = ap->add_sta_proc_entries;
1072 	ap->add_sta_proc_entries = NULL;
1073 
1074 	while (entry) {
1075 		spin_lock_bh(&ap->sta_table_lock);
1076 		sta = ap_get_sta(ap, entry->addr);
1077 		if (sta)
1078 			atomic_inc(&sta->users);
1079 		spin_unlock_bh(&ap->sta_table_lock);
1080 
1081 		if (sta) {
1082 			sprintf(name, "%pM", sta->addr);
1083 			sta->proc = proc_create_single_data(
1084 				name, 0, ap->proc,
1085 				prism2_sta_proc_show, sta);
1086 
1087 			atomic_dec(&sta->users);
1088 		}
1089 
1090 		prev = entry;
1091 		entry = entry->next;
1092 		kfree(prev);
1093 	}
1094 }
1095 
1096 
ap_add_sta(struct ap_data * ap,u8 * addr)1097 static struct sta_info * ap_add_sta(struct ap_data *ap, u8 *addr)
1098 {
1099 	struct sta_info *sta;
1100 
1101 	sta = kzalloc(sizeof(struct sta_info), GFP_ATOMIC);
1102 	if (sta == NULL) {
1103 		PDEBUG(DEBUG_AP, "AP: kmalloc failed\n");
1104 		return NULL;
1105 	}
1106 
1107 	/* initialize STA info data */
1108 	sta->local = ap->local;
1109 	skb_queue_head_init(&sta->tx_buf);
1110 	memcpy(sta->addr, addr, ETH_ALEN);
1111 
1112 	atomic_inc(&sta->users);
1113 	spin_lock_bh(&ap->sta_table_lock);
1114 	list_add(&sta->list, &ap->sta_list);
1115 	ap->num_sta++;
1116 	ap_sta_hash_add(ap, sta);
1117 	spin_unlock_bh(&ap->sta_table_lock);
1118 
1119 	if (ap->proc) {
1120 		struct add_sta_proc_data *entry;
1121 		/* schedule a non-interrupt context process to add a procfs
1122 		 * entry for the STA since procfs code use GFP_KERNEL */
1123 		entry = kmalloc(sizeof(*entry), GFP_ATOMIC);
1124 		if (entry) {
1125 			memcpy(entry->addr, sta->addr, ETH_ALEN);
1126 			entry->next = ap->add_sta_proc_entries;
1127 			ap->add_sta_proc_entries = entry;
1128 			schedule_work(&ap->add_sta_proc_queue);
1129 		} else
1130 			printk(KERN_DEBUG "Failed to add STA proc data\n");
1131 	}
1132 
1133 #ifndef PRISM2_NO_KERNEL_IEEE80211_MGMT
1134 	timer_setup(&sta->timer, ap_handle_timer, 0);
1135 	sta->timer.expires = jiffies + ap->max_inactivity;
1136 	if (!ap->local->hostapd)
1137 		add_timer(&sta->timer);
1138 #endif /* PRISM2_NO_KERNEL_IEEE80211_MGMT */
1139 
1140 	return sta;
1141 }
1142 
1143 
ap_tx_rate_ok(int rateidx,struct sta_info * sta,local_info_t * local)1144 static int ap_tx_rate_ok(int rateidx, struct sta_info *sta,
1145 			 local_info_t *local)
1146 {
1147 	if (rateidx > sta->tx_max_rate ||
1148 	    !(sta->tx_supp_rates & (1 << rateidx)))
1149 		return 0;
1150 
1151 	if (local->tx_rate_control != 0 &&
1152 	    !(local->tx_rate_control & (1 << rateidx)))
1153 		return 0;
1154 
1155 	return 1;
1156 }
1157 
1158 
prism2_check_tx_rates(struct sta_info * sta)1159 static void prism2_check_tx_rates(struct sta_info *sta)
1160 {
1161 	int i;
1162 
1163 	sta->tx_supp_rates = 0;
1164 	for (i = 0; i < sizeof(sta->supported_rates); i++) {
1165 		if ((sta->supported_rates[i] & 0x7f) == 2)
1166 			sta->tx_supp_rates |= WLAN_RATE_1M;
1167 		if ((sta->supported_rates[i] & 0x7f) == 4)
1168 			sta->tx_supp_rates |= WLAN_RATE_2M;
1169 		if ((sta->supported_rates[i] & 0x7f) == 11)
1170 			sta->tx_supp_rates |= WLAN_RATE_5M5;
1171 		if ((sta->supported_rates[i] & 0x7f) == 22)
1172 			sta->tx_supp_rates |= WLAN_RATE_11M;
1173 	}
1174 	sta->tx_max_rate = sta->tx_rate = sta->tx_rate_idx = 0;
1175 	if (sta->tx_supp_rates & WLAN_RATE_1M) {
1176 		sta->tx_max_rate = 0;
1177 		if (ap_tx_rate_ok(0, sta, sta->local)) {
1178 			sta->tx_rate = 10;
1179 			sta->tx_rate_idx = 0;
1180 		}
1181 	}
1182 	if (sta->tx_supp_rates & WLAN_RATE_2M) {
1183 		sta->tx_max_rate = 1;
1184 		if (ap_tx_rate_ok(1, sta, sta->local)) {
1185 			sta->tx_rate = 20;
1186 			sta->tx_rate_idx = 1;
1187 		}
1188 	}
1189 	if (sta->tx_supp_rates & WLAN_RATE_5M5) {
1190 		sta->tx_max_rate = 2;
1191 		if (ap_tx_rate_ok(2, sta, sta->local)) {
1192 			sta->tx_rate = 55;
1193 			sta->tx_rate_idx = 2;
1194 		}
1195 	}
1196 	if (sta->tx_supp_rates & WLAN_RATE_11M) {
1197 		sta->tx_max_rate = 3;
1198 		if (ap_tx_rate_ok(3, sta, sta->local)) {
1199 			sta->tx_rate = 110;
1200 			sta->tx_rate_idx = 3;
1201 		}
1202 	}
1203 }
1204 
1205 
1206 #ifndef PRISM2_NO_KERNEL_IEEE80211_MGMT
1207 
ap_crypt_init(struct ap_data * ap)1208 static void ap_crypt_init(struct ap_data *ap)
1209 {
1210 	ap->crypt = lib80211_get_crypto_ops("WEP");
1211 
1212 	if (ap->crypt) {
1213 		if (ap->crypt->init) {
1214 			ap->crypt_priv = ap->crypt->init(0);
1215 			if (ap->crypt_priv == NULL)
1216 				ap->crypt = NULL;
1217 			else {
1218 				u8 key[WEP_KEY_LEN];
1219 				get_random_bytes(key, WEP_KEY_LEN);
1220 				ap->crypt->set_key(key, WEP_KEY_LEN, NULL,
1221 						   ap->crypt_priv);
1222 			}
1223 		}
1224 	}
1225 
1226 	if (ap->crypt == NULL) {
1227 		printk(KERN_WARNING "AP could not initialize WEP: load module "
1228 		       "lib80211_crypt_wep.ko\n");
1229 	}
1230 }
1231 
1232 
1233 /* Generate challenge data for shared key authentication. IEEE 802.11 specifies
1234  * that WEP algorithm is used for generating challenge. This should be unique,
1235  * but otherwise there is not really need for randomness etc. Initialize WEP
1236  * with pseudo random key and then use increasing IV to get unique challenge
1237  * streams.
1238  *
1239  * Called only as a scheduled task for pending AP frames.
1240  */
ap_auth_make_challenge(struct ap_data * ap)1241 static char * ap_auth_make_challenge(struct ap_data *ap)
1242 {
1243 	char *tmpbuf;
1244 	struct sk_buff *skb;
1245 
1246 	if (ap->crypt == NULL) {
1247 		ap_crypt_init(ap);
1248 		if (ap->crypt == NULL)
1249 			return NULL;
1250 	}
1251 
1252 	tmpbuf = kmalloc(WLAN_AUTH_CHALLENGE_LEN, GFP_ATOMIC);
1253 	if (tmpbuf == NULL) {
1254 		PDEBUG(DEBUG_AP, "AP: kmalloc failed for challenge\n");
1255 		return NULL;
1256 	}
1257 
1258 	skb = dev_alloc_skb(WLAN_AUTH_CHALLENGE_LEN +
1259 			    ap->crypt->extra_mpdu_prefix_len +
1260 			    ap->crypt->extra_mpdu_postfix_len);
1261 	if (skb == NULL) {
1262 		kfree(tmpbuf);
1263 		return NULL;
1264 	}
1265 
1266 	skb_reserve(skb, ap->crypt->extra_mpdu_prefix_len);
1267 	skb_put_zero(skb, WLAN_AUTH_CHALLENGE_LEN);
1268 	if (ap->crypt->encrypt_mpdu(skb, 0, ap->crypt_priv)) {
1269 		dev_kfree_skb(skb);
1270 		kfree(tmpbuf);
1271 		return NULL;
1272 	}
1273 
1274 	skb_copy_from_linear_data_offset(skb, ap->crypt->extra_mpdu_prefix_len,
1275 					 tmpbuf, WLAN_AUTH_CHALLENGE_LEN);
1276 	dev_kfree_skb(skb);
1277 
1278 	return tmpbuf;
1279 }
1280 
1281 
1282 /* Called only as a scheduled task for pending AP frames. */
handle_authen(local_info_t * local,struct sk_buff * skb,struct hostap_80211_rx_status * rx_stats)1283 static void handle_authen(local_info_t *local, struct sk_buff *skb,
1284 			  struct hostap_80211_rx_status *rx_stats)
1285 {
1286 	struct net_device *dev = local->dev;
1287 	struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
1288 	size_t hdrlen;
1289 	struct ap_data *ap = local->ap;
1290 	char body[8 + WLAN_AUTH_CHALLENGE_LEN], *challenge = NULL;
1291 	int len, olen;
1292 	u16 auth_alg, auth_transaction, status_code;
1293 	__le16 *pos;
1294 	u16 resp = WLAN_STATUS_SUCCESS;
1295 	struct sta_info *sta = NULL;
1296 	struct lib80211_crypt_data *crypt;
1297 	char *txt = "";
1298 
1299 	len = skb->len - IEEE80211_MGMT_HDR_LEN;
1300 
1301 	hdrlen = hostap_80211_get_hdrlen(hdr->frame_control);
1302 
1303 	if (len < 6) {
1304 		PDEBUG(DEBUG_AP, "%s: handle_authen - too short payload "
1305 		       "(len=%d) from %pM\n", dev->name, len, hdr->addr2);
1306 		return;
1307 	}
1308 
1309 	spin_lock_bh(&local->ap->sta_table_lock);
1310 	sta = ap_get_sta(local->ap, hdr->addr2);
1311 	if (sta)
1312 		atomic_inc(&sta->users);
1313 	spin_unlock_bh(&local->ap->sta_table_lock);
1314 
1315 	if (sta && sta->crypt)
1316 		crypt = sta->crypt;
1317 	else {
1318 		int idx = 0;
1319 		if (skb->len >= hdrlen + 3)
1320 			idx = skb->data[hdrlen + 3] >> 6;
1321 		crypt = local->crypt_info.crypt[idx];
1322 	}
1323 
1324 	pos = (__le16 *) (skb->data + IEEE80211_MGMT_HDR_LEN);
1325 	auth_alg = __le16_to_cpu(*pos);
1326 	pos++;
1327 	auth_transaction = __le16_to_cpu(*pos);
1328 	pos++;
1329 	status_code = __le16_to_cpu(*pos);
1330 	pos++;
1331 
1332 	if (ether_addr_equal(dev->dev_addr, hdr->addr2) ||
1333 	    ap_control_mac_deny(&ap->mac_restrictions, hdr->addr2)) {
1334 		txt = "authentication denied";
1335 		resp = WLAN_STATUS_UNSPECIFIED_FAILURE;
1336 		goto fail;
1337 	}
1338 
1339 	if (((local->auth_algs & PRISM2_AUTH_OPEN) &&
1340 	     auth_alg == WLAN_AUTH_OPEN) ||
1341 	    ((local->auth_algs & PRISM2_AUTH_SHARED_KEY) &&
1342 	     crypt && auth_alg == WLAN_AUTH_SHARED_KEY)) {
1343 	} else {
1344 		txt = "unsupported algorithm";
1345 		resp = WLAN_STATUS_NOT_SUPPORTED_AUTH_ALG;
1346 		goto fail;
1347 	}
1348 
1349 	if (len >= 8) {
1350 		u8 *u = (u8 *) pos;
1351 		if (*u == WLAN_EID_CHALLENGE) {
1352 			if (*(u + 1) != WLAN_AUTH_CHALLENGE_LEN) {
1353 				txt = "invalid challenge len";
1354 				resp = WLAN_STATUS_CHALLENGE_FAIL;
1355 				goto fail;
1356 			}
1357 			if (len - 8 < WLAN_AUTH_CHALLENGE_LEN) {
1358 				txt = "challenge underflow";
1359 				resp = WLAN_STATUS_CHALLENGE_FAIL;
1360 				goto fail;
1361 			}
1362 			challenge = (char *) (u + 2);
1363 		}
1364 	}
1365 
1366 	if (sta && sta->ap) {
1367 		if (time_after(jiffies, sta->u.ap.last_beacon +
1368 			       (10 * sta->listen_interval * HZ) / 1024)) {
1369 			PDEBUG(DEBUG_AP, "%s: no beacons received for a while,"
1370 			       " assuming AP %pM is now STA\n",
1371 			       dev->name, sta->addr);
1372 			sta->ap = 0;
1373 			sta->flags = 0;
1374 			sta->u.sta.challenge = NULL;
1375 		} else {
1376 			txt = "AP trying to authenticate?";
1377 			resp = WLAN_STATUS_UNSPECIFIED_FAILURE;
1378 			goto fail;
1379 		}
1380 	}
1381 
1382 	if ((auth_alg == WLAN_AUTH_OPEN && auth_transaction == 1) ||
1383 	    (auth_alg == WLAN_AUTH_SHARED_KEY &&
1384 	     (auth_transaction == 1 ||
1385 	      (auth_transaction == 3 && sta != NULL &&
1386 	       sta->u.sta.challenge != NULL)))) {
1387 	} else {
1388 		txt = "unknown authentication transaction number";
1389 		resp = WLAN_STATUS_UNKNOWN_AUTH_TRANSACTION;
1390 		goto fail;
1391 	}
1392 
1393 	if (sta == NULL) {
1394 		txt = "new STA";
1395 
1396 		if (local->ap->num_sta >= MAX_STA_COUNT) {
1397 			/* FIX: might try to remove some old STAs first? */
1398 			txt = "no more room for new STAs";
1399 			resp = WLAN_STATUS_UNSPECIFIED_FAILURE;
1400 			goto fail;
1401 		}
1402 
1403 		sta = ap_add_sta(local->ap, hdr->addr2);
1404 		if (sta == NULL) {
1405 			txt = "ap_add_sta failed";
1406 			resp = WLAN_STATUS_UNSPECIFIED_FAILURE;
1407 			goto fail;
1408 		}
1409 	}
1410 
1411 	switch (auth_alg) {
1412 	case WLAN_AUTH_OPEN:
1413 		txt = "authOK";
1414 		/* IEEE 802.11 standard is not completely clear about
1415 		 * whether STA is considered authenticated after
1416 		 * authentication OK frame has been send or after it
1417 		 * has been ACKed. In order to reduce interoperability
1418 		 * issues, mark the STA authenticated before ACK. */
1419 		sta->flags |= WLAN_STA_AUTH;
1420 		break;
1421 
1422 	case WLAN_AUTH_SHARED_KEY:
1423 		if (auth_transaction == 1) {
1424 			if (sta->u.sta.challenge == NULL) {
1425 				sta->u.sta.challenge =
1426 					ap_auth_make_challenge(local->ap);
1427 				if (sta->u.sta.challenge == NULL) {
1428 					resp = WLAN_STATUS_UNSPECIFIED_FAILURE;
1429 					goto fail;
1430 				}
1431 			}
1432 		} else {
1433 			if (sta->u.sta.challenge == NULL ||
1434 			    challenge == NULL ||
1435 			    memcmp(sta->u.sta.challenge, challenge,
1436 				   WLAN_AUTH_CHALLENGE_LEN) != 0 ||
1437 			    !ieee80211_has_protected(hdr->frame_control)) {
1438 				txt = "challenge response incorrect";
1439 				resp = WLAN_STATUS_CHALLENGE_FAIL;
1440 				goto fail;
1441 			}
1442 
1443 			txt = "challenge OK - authOK";
1444 			/* IEEE 802.11 standard is not completely clear about
1445 			 * whether STA is considered authenticated after
1446 			 * authentication OK frame has been send or after it
1447 			 * has been ACKed. In order to reduce interoperability
1448 			 * issues, mark the STA authenticated before ACK. */
1449 			sta->flags |= WLAN_STA_AUTH;
1450 			kfree(sta->u.sta.challenge);
1451 			sta->u.sta.challenge = NULL;
1452 		}
1453 		break;
1454 	}
1455 
1456  fail:
1457 	pos = (__le16 *) body;
1458 	*pos = cpu_to_le16(auth_alg);
1459 	pos++;
1460 	*pos = cpu_to_le16(auth_transaction + 1);
1461 	pos++;
1462 	*pos = cpu_to_le16(resp); /* status_code */
1463 	pos++;
1464 	olen = 6;
1465 
1466 	if (resp == WLAN_STATUS_SUCCESS && sta != NULL &&
1467 	    sta->u.sta.challenge != NULL &&
1468 	    auth_alg == WLAN_AUTH_SHARED_KEY && auth_transaction == 1) {
1469 		u8 *tmp = (u8 *) pos;
1470 		*tmp++ = WLAN_EID_CHALLENGE;
1471 		*tmp++ = WLAN_AUTH_CHALLENGE_LEN;
1472 		pos++;
1473 		memcpy(pos, sta->u.sta.challenge, WLAN_AUTH_CHALLENGE_LEN);
1474 		olen += 2 + WLAN_AUTH_CHALLENGE_LEN;
1475 	}
1476 
1477 	prism2_send_mgmt(dev, IEEE80211_FTYPE_MGMT | IEEE80211_STYPE_AUTH,
1478 			 body, olen, hdr->addr2, ap->tx_callback_auth);
1479 
1480 	if (sta) {
1481 		sta->last_rx = jiffies;
1482 		atomic_dec(&sta->users);
1483 	}
1484 
1485 	if (resp) {
1486 		PDEBUG(DEBUG_AP, "%s: %pM auth (alg=%d "
1487 		       "trans#=%d stat=%d len=%d fc=%04x) ==> %d (%s)\n",
1488 		       dev->name, hdr->addr2,
1489 		       auth_alg, auth_transaction, status_code, len,
1490 		       le16_to_cpu(hdr->frame_control), resp, txt);
1491 	}
1492 }
1493 
1494 
1495 /* Called only as a scheduled task for pending AP frames. */
handle_assoc(local_info_t * local,struct sk_buff * skb,struct hostap_80211_rx_status * rx_stats,int reassoc)1496 static void handle_assoc(local_info_t *local, struct sk_buff *skb,
1497 			 struct hostap_80211_rx_status *rx_stats, int reassoc)
1498 {
1499 	struct net_device *dev = local->dev;
1500 	struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
1501 	char body[12], *p, *lpos;
1502 	int len, left;
1503 	__le16 *pos;
1504 	u16 resp = WLAN_STATUS_SUCCESS;
1505 	struct sta_info *sta = NULL;
1506 	int send_deauth = 0;
1507 	char __always_unused *txt = "";
1508 	u8 prev_ap[ETH_ALEN];
1509 
1510 	left = len = skb->len - IEEE80211_MGMT_HDR_LEN;
1511 
1512 	if (len < (reassoc ? 10 : 4)) {
1513 		PDEBUG(DEBUG_AP, "%s: handle_assoc - too short payload "
1514 		       "(len=%d, reassoc=%d) from %pM\n",
1515 		       dev->name, len, reassoc, hdr->addr2);
1516 		return;
1517 	}
1518 
1519 	spin_lock_bh(&local->ap->sta_table_lock);
1520 	sta = ap_get_sta(local->ap, hdr->addr2);
1521 	if (sta == NULL || (sta->flags & WLAN_STA_AUTH) == 0) {
1522 		spin_unlock_bh(&local->ap->sta_table_lock);
1523 		txt = "trying to associate before authentication";
1524 		send_deauth = 1;
1525 		resp = WLAN_STATUS_UNSPECIFIED_FAILURE;
1526 		sta = NULL; /* do not decrement sta->users */
1527 		goto fail;
1528 	}
1529 	atomic_inc(&sta->users);
1530 	spin_unlock_bh(&local->ap->sta_table_lock);
1531 
1532 	pos = (__le16 *) (skb->data + IEEE80211_MGMT_HDR_LEN);
1533 	sta->capability = __le16_to_cpu(*pos);
1534 	pos++; left -= 2;
1535 	sta->listen_interval = __le16_to_cpu(*pos);
1536 	pos++; left -= 2;
1537 
1538 	if (reassoc) {
1539 		memcpy(prev_ap, pos, ETH_ALEN);
1540 		pos++; pos++; pos++; left -= 6;
1541 	} else
1542 		eth_zero_addr(prev_ap);
1543 
1544 	if (left >= 2) {
1545 		unsigned int ileft;
1546 		unsigned char *u = (unsigned char *) pos;
1547 
1548 		if (*u == WLAN_EID_SSID) {
1549 			u++; left--;
1550 			ileft = *u;
1551 			u++; left--;
1552 
1553 			if (ileft > left || ileft > MAX_SSID_LEN) {
1554 				txt = "SSID overflow";
1555 				resp = WLAN_STATUS_UNSPECIFIED_FAILURE;
1556 				goto fail;
1557 			}
1558 
1559 			if (ileft != strlen(local->essid) ||
1560 			    memcmp(local->essid, u, ileft) != 0) {
1561 				txt = "not our SSID";
1562 				resp = WLAN_STATUS_ASSOC_DENIED_UNSPEC;
1563 				goto fail;
1564 			}
1565 
1566 			u += ileft;
1567 			left -= ileft;
1568 		}
1569 
1570 		if (left >= 2 && *u == WLAN_EID_SUPP_RATES) {
1571 			u++; left--;
1572 			ileft = *u;
1573 			u++; left--;
1574 
1575 			if (ileft > left || ileft == 0 ||
1576 			    ileft > WLAN_SUPP_RATES_MAX) {
1577 				txt = "SUPP_RATES len error";
1578 				resp = WLAN_STATUS_UNSPECIFIED_FAILURE;
1579 				goto fail;
1580 			}
1581 
1582 			memset(sta->supported_rates, 0,
1583 			       sizeof(sta->supported_rates));
1584 			memcpy(sta->supported_rates, u, ileft);
1585 			prism2_check_tx_rates(sta);
1586 
1587 			u += ileft;
1588 			left -= ileft;
1589 		}
1590 
1591 		if (left > 0) {
1592 			PDEBUG(DEBUG_AP, "%s: assoc from %pM"
1593 			       " with extra data (%d bytes) [",
1594 			       dev->name, hdr->addr2, left);
1595 			while (left > 0) {
1596 				PDEBUG2(DEBUG_AP, "<%02x>", *u);
1597 				u++; left--;
1598 			}
1599 			PDEBUG2(DEBUG_AP, "]\n");
1600 		}
1601 	} else {
1602 		txt = "frame underflow";
1603 		resp = WLAN_STATUS_UNSPECIFIED_FAILURE;
1604 		goto fail;
1605 	}
1606 
1607 	/* get a unique AID */
1608 	if (sta->aid > 0)
1609 		txt = "OK, old AID";
1610 	else {
1611 		spin_lock_bh(&local->ap->sta_table_lock);
1612 		for (sta->aid = 1; sta->aid <= MAX_AID_TABLE_SIZE; sta->aid++)
1613 			if (local->ap->sta_aid[sta->aid - 1] == NULL)
1614 				break;
1615 		if (sta->aid > MAX_AID_TABLE_SIZE) {
1616 			sta->aid = 0;
1617 			spin_unlock_bh(&local->ap->sta_table_lock);
1618 			resp = WLAN_STATUS_AP_UNABLE_TO_HANDLE_NEW_STA;
1619 			txt = "no room for more AIDs";
1620 		} else {
1621 			local->ap->sta_aid[sta->aid - 1] = sta;
1622 			spin_unlock_bh(&local->ap->sta_table_lock);
1623 			txt = "OK, new AID";
1624 		}
1625 	}
1626 
1627  fail:
1628 	pos = (__le16 *) body;
1629 
1630 	if (send_deauth) {
1631 		*pos = cpu_to_le16(WLAN_REASON_STA_REQ_ASSOC_WITHOUT_AUTH);
1632 		pos++;
1633 	} else {
1634 		/* FIX: CF-Pollable and CF-PollReq should be set to match the
1635 		 * values in beacons/probe responses */
1636 		/* FIX: how about privacy and WEP? */
1637 		/* capability */
1638 		*pos = cpu_to_le16(WLAN_CAPABILITY_ESS);
1639 		pos++;
1640 
1641 		/* status_code */
1642 		*pos = cpu_to_le16(resp);
1643 		pos++;
1644 
1645 		*pos = cpu_to_le16((sta && sta->aid > 0 ? sta->aid : 0) |
1646 				     BIT(14) | BIT(15)); /* AID */
1647 		pos++;
1648 
1649 		/* Supported rates (Information element) */
1650 		p = (char *) pos;
1651 		*p++ = WLAN_EID_SUPP_RATES;
1652 		lpos = p;
1653 		*p++ = 0; /* len */
1654 		if (local->tx_rate_control & WLAN_RATE_1M) {
1655 			*p++ = local->basic_rates & WLAN_RATE_1M ? 0x82 : 0x02;
1656 			(*lpos)++;
1657 		}
1658 		if (local->tx_rate_control & WLAN_RATE_2M) {
1659 			*p++ = local->basic_rates & WLAN_RATE_2M ? 0x84 : 0x04;
1660 			(*lpos)++;
1661 		}
1662 		if (local->tx_rate_control & WLAN_RATE_5M5) {
1663 			*p++ = local->basic_rates & WLAN_RATE_5M5 ?
1664 				0x8b : 0x0b;
1665 			(*lpos)++;
1666 		}
1667 		if (local->tx_rate_control & WLAN_RATE_11M) {
1668 			*p++ = local->basic_rates & WLAN_RATE_11M ?
1669 				0x96 : 0x16;
1670 			(*lpos)++;
1671 		}
1672 		pos = (__le16 *) p;
1673 	}
1674 
1675 	prism2_send_mgmt(dev, IEEE80211_FTYPE_MGMT |
1676 			 (send_deauth ? IEEE80211_STYPE_DEAUTH :
1677 			  (reassoc ? IEEE80211_STYPE_REASSOC_RESP :
1678 			   IEEE80211_STYPE_ASSOC_RESP)),
1679 			 body, (u8 *) pos - (u8 *) body,
1680 			 hdr->addr2,
1681 			 send_deauth ? 0 : local->ap->tx_callback_assoc);
1682 
1683 	if (sta) {
1684 		if (resp == WLAN_STATUS_SUCCESS) {
1685 			sta->last_rx = jiffies;
1686 			/* STA will be marked associated from TX callback, if
1687 			 * AssocResp is ACKed */
1688 		}
1689 		atomic_dec(&sta->users);
1690 	}
1691 
1692 #if 0
1693 	PDEBUG(DEBUG_AP, "%s: %pM %sassoc (len=%d "
1694 	       "prev_ap=%pM) => %d(%d) (%s)\n",
1695 	       dev->name,
1696 	       hdr->addr2,
1697 	       reassoc ? "re" : "", len,
1698 	       prev_ap,
1699 	       resp, send_deauth, txt);
1700 #endif
1701 }
1702 
1703 
1704 /* Called only as a scheduled task for pending AP frames. */
handle_deauth(local_info_t * local,struct sk_buff * skb,struct hostap_80211_rx_status * rx_stats)1705 static void handle_deauth(local_info_t *local, struct sk_buff *skb,
1706 			  struct hostap_80211_rx_status *rx_stats)
1707 {
1708 	struct net_device *dev = local->dev;
1709 	struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
1710 	char *body = (char *) (skb->data + IEEE80211_MGMT_HDR_LEN);
1711 	int len;
1712 	u16 reason_code;
1713 	__le16 *pos;
1714 	struct sta_info *sta = NULL;
1715 
1716 	len = skb->len - IEEE80211_MGMT_HDR_LEN;
1717 
1718 	if (len < 2) {
1719 		printk("handle_deauth - too short payload (len=%d)\n", len);
1720 		return;
1721 	}
1722 
1723 	pos = (__le16 *) body;
1724 	reason_code = le16_to_cpu(*pos);
1725 
1726 	PDEBUG(DEBUG_AP, "%s: deauthentication: %pM len=%d, "
1727 	       "reason_code=%d\n", dev->name, hdr->addr2,
1728 	       len, reason_code);
1729 
1730 	spin_lock_bh(&local->ap->sta_table_lock);
1731 	sta = ap_get_sta(local->ap, hdr->addr2);
1732 	if (sta != NULL) {
1733 		if ((sta->flags & WLAN_STA_ASSOC) && !sta->ap)
1734 			hostap_event_expired_sta(local->dev, sta);
1735 		sta->flags &= ~(WLAN_STA_AUTH | WLAN_STA_ASSOC);
1736 	}
1737 	spin_unlock_bh(&local->ap->sta_table_lock);
1738 	if (sta == NULL) {
1739 		printk("%s: deauthentication from %pM, "
1740 	       "reason_code=%d, but STA not authenticated\n", dev->name,
1741 		       hdr->addr2, reason_code);
1742 	}
1743 }
1744 
1745 
1746 /* Called only as a scheduled task for pending AP frames. */
handle_disassoc(local_info_t * local,struct sk_buff * skb,struct hostap_80211_rx_status * rx_stats)1747 static void handle_disassoc(local_info_t *local, struct sk_buff *skb,
1748 			    struct hostap_80211_rx_status *rx_stats)
1749 {
1750 	struct net_device *dev = local->dev;
1751 	struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
1752 	char *body = skb->data + IEEE80211_MGMT_HDR_LEN;
1753 	int len;
1754 	u16 reason_code;
1755 	__le16 *pos;
1756 	struct sta_info *sta = NULL;
1757 
1758 	len = skb->len - IEEE80211_MGMT_HDR_LEN;
1759 
1760 	if (len < 2) {
1761 		printk("handle_disassoc - too short payload (len=%d)\n", len);
1762 		return;
1763 	}
1764 
1765 	pos = (__le16 *) body;
1766 	reason_code = le16_to_cpu(*pos);
1767 
1768 	PDEBUG(DEBUG_AP, "%s: disassociation: %pM len=%d, "
1769 	       "reason_code=%d\n", dev->name, hdr->addr2,
1770 	       len, reason_code);
1771 
1772 	spin_lock_bh(&local->ap->sta_table_lock);
1773 	sta = ap_get_sta(local->ap, hdr->addr2);
1774 	if (sta != NULL) {
1775 		if ((sta->flags & WLAN_STA_ASSOC) && !sta->ap)
1776 			hostap_event_expired_sta(local->dev, sta);
1777 		sta->flags &= ~WLAN_STA_ASSOC;
1778 	}
1779 	spin_unlock_bh(&local->ap->sta_table_lock);
1780 	if (sta == NULL) {
1781 		printk("%s: disassociation from %pM, "
1782 		       "reason_code=%d, but STA not authenticated\n",
1783 		       dev->name, hdr->addr2, reason_code);
1784 	}
1785 }
1786 
1787 
1788 /* Called only as a scheduled task for pending AP frames. */
ap_handle_data_nullfunc(local_info_t * local,struct ieee80211_hdr * hdr)1789 static void ap_handle_data_nullfunc(local_info_t *local,
1790 				    struct ieee80211_hdr *hdr)
1791 {
1792 	struct net_device *dev = local->dev;
1793 
1794 	/* some STA f/w's seem to require control::ACK frame for
1795 	 * data::nullfunc, but at least Prism2 station f/w version 0.8.0 does
1796 	 * not send this..
1797 	 * send control::ACK for the data::nullfunc */
1798 
1799 	printk(KERN_DEBUG "Sending control::ACK for data::nullfunc\n");
1800 	prism2_send_mgmt(dev, IEEE80211_FTYPE_CTL | IEEE80211_STYPE_ACK,
1801 			 NULL, 0, hdr->addr2, 0);
1802 }
1803 
1804 
1805 /* Called only as a scheduled task for pending AP frames. */
ap_handle_dropped_data(local_info_t * local,struct ieee80211_hdr * hdr)1806 static void ap_handle_dropped_data(local_info_t *local,
1807 				   struct ieee80211_hdr *hdr)
1808 {
1809 	struct net_device *dev = local->dev;
1810 	struct sta_info *sta;
1811 	__le16 reason;
1812 
1813 	spin_lock_bh(&local->ap->sta_table_lock);
1814 	sta = ap_get_sta(local->ap, hdr->addr2);
1815 	if (sta)
1816 		atomic_inc(&sta->users);
1817 	spin_unlock_bh(&local->ap->sta_table_lock);
1818 
1819 	if (sta != NULL && (sta->flags & WLAN_STA_ASSOC)) {
1820 		PDEBUG(DEBUG_AP, "ap_handle_dropped_data: STA is now okay?\n");
1821 		atomic_dec(&sta->users);
1822 		return;
1823 	}
1824 
1825 	reason = cpu_to_le16(WLAN_REASON_CLASS3_FRAME_FROM_NONASSOC_STA);
1826 	prism2_send_mgmt(dev, IEEE80211_FTYPE_MGMT |
1827 			 ((sta == NULL || !(sta->flags & WLAN_STA_ASSOC)) ?
1828 			  IEEE80211_STYPE_DEAUTH : IEEE80211_STYPE_DISASSOC),
1829 			 (char *) &reason, sizeof(reason), hdr->addr2, 0);
1830 
1831 	if (sta)
1832 		atomic_dec(&sta->users);
1833 }
1834 
1835 #endif /* PRISM2_NO_KERNEL_IEEE80211_MGMT */
1836 
1837 
1838 /* Called only as a scheduled task for pending AP frames. */
pspoll_send_buffered(local_info_t * local,struct sta_info * sta,struct sk_buff * skb)1839 static void pspoll_send_buffered(local_info_t *local, struct sta_info *sta,
1840 				 struct sk_buff *skb)
1841 {
1842 	struct hostap_skb_tx_data *meta;
1843 
1844 	if (!(sta->flags & WLAN_STA_PS)) {
1845 		/* Station has moved to non-PS mode, so send all buffered
1846 		 * frames using normal device queue. */
1847 		dev_queue_xmit(skb);
1848 		return;
1849 	}
1850 
1851 	/* add a flag for hostap_handle_sta_tx() to know that this skb should
1852 	 * be passed through even though STA is using PS */
1853 	meta = (struct hostap_skb_tx_data *) skb->cb;
1854 	meta->flags |= HOSTAP_TX_FLAGS_BUFFERED_FRAME;
1855 	if (!skb_queue_empty(&sta->tx_buf)) {
1856 		/* indicate to STA that more frames follow */
1857 		meta->flags |= HOSTAP_TX_FLAGS_ADD_MOREDATA;
1858 	}
1859 	dev_queue_xmit(skb);
1860 }
1861 
1862 
1863 /* Called only as a scheduled task for pending AP frames. */
handle_pspoll(local_info_t * local,struct ieee80211_hdr * hdr,struct hostap_80211_rx_status * rx_stats)1864 static void handle_pspoll(local_info_t *local,
1865 			  struct ieee80211_hdr *hdr,
1866 			  struct hostap_80211_rx_status *rx_stats)
1867 {
1868 	struct net_device *dev = local->dev;
1869 	struct sta_info *sta;
1870 	u16 aid;
1871 	struct sk_buff *skb;
1872 
1873 	PDEBUG(DEBUG_PS2, "handle_pspoll: BSSID=%pM, TA=%pM PWRMGT=%d\n",
1874 	       hdr->addr1, hdr->addr2, !!ieee80211_has_pm(hdr->frame_control));
1875 
1876 	if (!ether_addr_equal(hdr->addr1, dev->dev_addr)) {
1877 		PDEBUG(DEBUG_AP,
1878 		       "handle_pspoll - addr1(BSSID)=%pM not own MAC\n",
1879 		       hdr->addr1);
1880 		return;
1881 	}
1882 
1883 	aid = le16_to_cpu(hdr->duration_id);
1884 	if ((aid & (BIT(15) | BIT(14))) != (BIT(15) | BIT(14))) {
1885 		PDEBUG(DEBUG_PS, "   PSPOLL and AID[15:14] not set\n");
1886 		return;
1887 	}
1888 	aid &= ~(BIT(15) | BIT(14));
1889 	if (aid == 0 || aid > MAX_AID_TABLE_SIZE) {
1890 		PDEBUG(DEBUG_PS, "   invalid aid=%d\n", aid);
1891 		return;
1892 	}
1893 	PDEBUG(DEBUG_PS2, "   aid=%d\n", aid);
1894 
1895 	spin_lock_bh(&local->ap->sta_table_lock);
1896 	sta = ap_get_sta(local->ap, hdr->addr2);
1897 	if (sta)
1898 		atomic_inc(&sta->users);
1899 	spin_unlock_bh(&local->ap->sta_table_lock);
1900 
1901 	if (sta == NULL) {
1902 		PDEBUG(DEBUG_PS, "   STA not found\n");
1903 		return;
1904 	}
1905 	if (sta->aid != aid) {
1906 		PDEBUG(DEBUG_PS, "   received aid=%i does not match with "
1907 		       "assoc.aid=%d\n", aid, sta->aid);
1908 		return;
1909 	}
1910 
1911 	/* FIX: todo:
1912 	 * - add timeout for buffering (clear aid in TIM vector if buffer timed
1913 	 *   out (expiry time must be longer than ListenInterval for
1914 	 *   the corresponding STA; "8802-11: 11.2.1.9 AP aging function"
1915 	 * - what to do, if buffered, pspolled, and sent frame is not ACKed by
1916 	 *   sta; store buffer for later use and leave TIM aid bit set? use
1917 	 *   TX event to check whether frame was ACKed?
1918 	 */
1919 
1920 	while ((skb = skb_dequeue(&sta->tx_buf)) != NULL) {
1921 		/* send buffered frame .. */
1922 		PDEBUG(DEBUG_PS2, "Sending buffered frame to STA after PS POLL"
1923 		       " (buffer_count=%d)\n", skb_queue_len(&sta->tx_buf));
1924 
1925 		pspoll_send_buffered(local, sta, skb);
1926 
1927 		if (sta->flags & WLAN_STA_PS) {
1928 			/* send only one buffered packet per PS Poll */
1929 			/* FIX: should ignore further PS Polls until the
1930 			 * buffered packet that was just sent is acknowledged
1931 			 * (Tx or TxExc event) */
1932 			break;
1933 		}
1934 	}
1935 
1936 	if (skb_queue_empty(&sta->tx_buf)) {
1937 		/* try to clear aid from TIM */
1938 		if (!(sta->flags & WLAN_STA_TIM))
1939 			PDEBUG(DEBUG_PS2,  "Re-unsetting TIM for aid %d\n",
1940 			       aid);
1941 		hostap_set_tim(local, aid, 0);
1942 		sta->flags &= ~WLAN_STA_TIM;
1943 	}
1944 
1945 	atomic_dec(&sta->users);
1946 }
1947 
1948 
1949 #ifndef PRISM2_NO_KERNEL_IEEE80211_MGMT
1950 
handle_wds_oper_queue(struct work_struct * work)1951 static void handle_wds_oper_queue(struct work_struct *work)
1952 {
1953 	struct ap_data *ap = container_of(work, struct ap_data,
1954 					  wds_oper_queue);
1955 	local_info_t *local = ap->local;
1956 	struct wds_oper_data *entry, *prev;
1957 
1958 	spin_lock_bh(&local->lock);
1959 	entry = local->ap->wds_oper_entries;
1960 	local->ap->wds_oper_entries = NULL;
1961 	spin_unlock_bh(&local->lock);
1962 
1963 	while (entry) {
1964 		PDEBUG(DEBUG_AP, "%s: %s automatic WDS connection "
1965 		       "to AP %pM\n",
1966 		       local->dev->name,
1967 		       entry->type == WDS_ADD ? "adding" : "removing",
1968 		       entry->addr);
1969 		if (entry->type == WDS_ADD)
1970 			prism2_wds_add(local, entry->addr, 0);
1971 		else if (entry->type == WDS_DEL)
1972 			prism2_wds_del(local, entry->addr, 0, 1);
1973 
1974 		prev = entry;
1975 		entry = entry->next;
1976 		kfree(prev);
1977 	}
1978 }
1979 
1980 
1981 /* Called only as a scheduled task for pending AP frames. */
handle_beacon(local_info_t * local,struct sk_buff * skb,struct hostap_80211_rx_status * rx_stats)1982 static void handle_beacon(local_info_t *local, struct sk_buff *skb,
1983 			  struct hostap_80211_rx_status *rx_stats)
1984 {
1985 	struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
1986 	char *body = skb->data + IEEE80211_MGMT_HDR_LEN;
1987 	int len, left;
1988 	u16 beacon_int, capability;
1989 	__le16 *pos;
1990 	char *ssid = NULL;
1991 	unsigned char *supp_rates = NULL;
1992 	int ssid_len = 0, supp_rates_len = 0;
1993 	struct sta_info *sta = NULL;
1994 	int new_sta = 0, channel = -1;
1995 
1996 	len = skb->len - IEEE80211_MGMT_HDR_LEN;
1997 
1998 	if (len < 8 + 2 + 2) {
1999 		printk(KERN_DEBUG "handle_beacon - too short payload "
2000 		       "(len=%d)\n", len);
2001 		return;
2002 	}
2003 
2004 	pos = (__le16 *) body;
2005 	left = len;
2006 
2007 	/* Timestamp (8 octets) */
2008 	pos += 4; left -= 8;
2009 	/* Beacon interval (2 octets) */
2010 	beacon_int = le16_to_cpu(*pos);
2011 	pos++; left -= 2;
2012 	/* Capability information (2 octets) */
2013 	capability = le16_to_cpu(*pos);
2014 	pos++; left -= 2;
2015 
2016 	if (local->ap->ap_policy != AP_OTHER_AP_EVEN_IBSS &&
2017 	    capability & WLAN_CAPABILITY_IBSS)
2018 		return;
2019 
2020 	if (left >= 2) {
2021 		unsigned int ileft;
2022 		unsigned char *u = (unsigned char *) pos;
2023 
2024 		if (*u == WLAN_EID_SSID) {
2025 			u++; left--;
2026 			ileft = *u;
2027 			u++; left--;
2028 
2029 			if (ileft > left || ileft > MAX_SSID_LEN) {
2030 				PDEBUG(DEBUG_AP, "SSID: overflow\n");
2031 				return;
2032 			}
2033 
2034 			if (local->ap->ap_policy == AP_OTHER_AP_SAME_SSID &&
2035 			    (ileft != strlen(local->essid) ||
2036 			     memcmp(local->essid, u, ileft) != 0)) {
2037 				/* not our SSID */
2038 				return;
2039 			}
2040 
2041 			ssid = u;
2042 			ssid_len = ileft;
2043 
2044 			u += ileft;
2045 			left -= ileft;
2046 		}
2047 
2048 		if (*u == WLAN_EID_SUPP_RATES) {
2049 			u++; left--;
2050 			ileft = *u;
2051 			u++; left--;
2052 
2053 			if (ileft > left || ileft == 0 || ileft > 8) {
2054 				PDEBUG(DEBUG_AP, " - SUPP_RATES len error\n");
2055 				return;
2056 			}
2057 
2058 			supp_rates = u;
2059 			supp_rates_len = ileft;
2060 
2061 			u += ileft;
2062 			left -= ileft;
2063 		}
2064 
2065 		if (*u == WLAN_EID_DS_PARAMS) {
2066 			u++; left--;
2067 			ileft = *u;
2068 			u++; left--;
2069 
2070 			if (ileft > left || ileft != 1) {
2071 				PDEBUG(DEBUG_AP, " - DS_PARAMS len error\n");
2072 				return;
2073 			}
2074 
2075 			channel = *u;
2076 
2077 			u += ileft;
2078 			left -= ileft;
2079 		}
2080 	}
2081 
2082 	spin_lock_bh(&local->ap->sta_table_lock);
2083 	sta = ap_get_sta(local->ap, hdr->addr2);
2084 	if (sta != NULL)
2085 		atomic_inc(&sta->users);
2086 	spin_unlock_bh(&local->ap->sta_table_lock);
2087 
2088 	if (sta == NULL) {
2089 		/* add new AP */
2090 		new_sta = 1;
2091 		sta = ap_add_sta(local->ap, hdr->addr2);
2092 		if (sta == NULL) {
2093 			printk(KERN_INFO "prism2: kmalloc failed for AP "
2094 			       "data structure\n");
2095 			return;
2096 		}
2097 		hostap_event_new_sta(local->dev, sta);
2098 
2099 		/* mark APs authentication and associated for pseudo ad-hoc
2100 		 * style communication */
2101 		sta->flags = WLAN_STA_AUTH | WLAN_STA_ASSOC;
2102 
2103 		if (local->ap->autom_ap_wds) {
2104 			hostap_wds_link_oper(local, sta->addr, WDS_ADD);
2105 		}
2106 	}
2107 
2108 	sta->ap = 1;
2109 	if (ssid) {
2110 		sta->u.ap.ssid_len = ssid_len;
2111 		memcpy(sta->u.ap.ssid, ssid, ssid_len);
2112 		sta->u.ap.ssid[ssid_len] = '\0';
2113 	} else {
2114 		sta->u.ap.ssid_len = 0;
2115 		sta->u.ap.ssid[0] = '\0';
2116 	}
2117 	sta->u.ap.channel = channel;
2118 	sta->rx_packets++;
2119 	sta->rx_bytes += len;
2120 	sta->u.ap.last_beacon = sta->last_rx = jiffies;
2121 	sta->capability = capability;
2122 	sta->listen_interval = beacon_int;
2123 
2124 	atomic_dec(&sta->users);
2125 
2126 	if (new_sta) {
2127 		memset(sta->supported_rates, 0, sizeof(sta->supported_rates));
2128 		memcpy(sta->supported_rates, supp_rates, supp_rates_len);
2129 		prism2_check_tx_rates(sta);
2130 	}
2131 }
2132 
2133 #endif /* PRISM2_NO_KERNEL_IEEE80211_MGMT */
2134 
2135 
2136 /* Called only as a tasklet. */
handle_ap_item(local_info_t * local,struct sk_buff * skb,struct hostap_80211_rx_status * rx_stats)2137 static void handle_ap_item(local_info_t *local, struct sk_buff *skb,
2138 			   struct hostap_80211_rx_status *rx_stats)
2139 {
2140 #ifndef PRISM2_NO_KERNEL_IEEE80211_MGMT
2141 	struct net_device *dev = local->dev;
2142 #endif /* PRISM2_NO_KERNEL_IEEE80211_MGMT */
2143 	u16 fc, type, stype;
2144 	struct ieee80211_hdr *hdr;
2145 
2146 	/* FIX: should give skb->len to handler functions and check that the
2147 	 * buffer is long enough */
2148 	hdr = (struct ieee80211_hdr *) skb->data;
2149 	fc = le16_to_cpu(hdr->frame_control);
2150 	type = fc & IEEE80211_FCTL_FTYPE;
2151 	stype = fc & IEEE80211_FCTL_STYPE;
2152 
2153 #ifndef PRISM2_NO_KERNEL_IEEE80211_MGMT
2154 	if (!local->hostapd && type == IEEE80211_FTYPE_DATA) {
2155 		PDEBUG(DEBUG_AP, "handle_ap_item - data frame\n");
2156 
2157 		if (!(fc & IEEE80211_FCTL_TODS) ||
2158 		    (fc & IEEE80211_FCTL_FROMDS)) {
2159 			if (stype == IEEE80211_STYPE_NULLFUNC) {
2160 				/* no ToDS nullfunc seems to be used to check
2161 				 * AP association; so send reject message to
2162 				 * speed up re-association */
2163 				ap_handle_dropped_data(local, hdr);
2164 				goto done;
2165 			}
2166 			PDEBUG(DEBUG_AP, "   not ToDS frame (fc=0x%04x)\n",
2167 			       fc);
2168 			goto done;
2169 		}
2170 
2171 		if (!ether_addr_equal(hdr->addr1, dev->dev_addr)) {
2172 			PDEBUG(DEBUG_AP, "handle_ap_item - addr1(BSSID)=%pM"
2173 			       " not own MAC\n", hdr->addr1);
2174 			goto done;
2175 		}
2176 
2177 		if (local->ap->nullfunc_ack &&
2178 		    stype == IEEE80211_STYPE_NULLFUNC)
2179 			ap_handle_data_nullfunc(local, hdr);
2180 		else
2181 			ap_handle_dropped_data(local, hdr);
2182 		goto done;
2183 	}
2184 
2185 	if (type == IEEE80211_FTYPE_MGMT && stype == IEEE80211_STYPE_BEACON) {
2186 		handle_beacon(local, skb, rx_stats);
2187 		goto done;
2188 	}
2189 #endif /* PRISM2_NO_KERNEL_IEEE80211_MGMT */
2190 
2191 	if (type == IEEE80211_FTYPE_CTL && stype == IEEE80211_STYPE_PSPOLL) {
2192 		handle_pspoll(local, hdr, rx_stats);
2193 		goto done;
2194 	}
2195 
2196 	if (local->hostapd) {
2197 		PDEBUG(DEBUG_AP, "Unknown frame in AP queue: type=0x%02x "
2198 		       "subtype=0x%02x\n", type, stype);
2199 		goto done;
2200 	}
2201 
2202 #ifndef PRISM2_NO_KERNEL_IEEE80211_MGMT
2203 	if (type != IEEE80211_FTYPE_MGMT) {
2204 		PDEBUG(DEBUG_AP, "handle_ap_item - not a management frame?\n");
2205 		goto done;
2206 	}
2207 
2208 	if (!ether_addr_equal(hdr->addr1, dev->dev_addr)) {
2209 		PDEBUG(DEBUG_AP, "handle_ap_item - addr1(DA)=%pM"
2210 		       " not own MAC\n", hdr->addr1);
2211 		goto done;
2212 	}
2213 
2214 	if (!ether_addr_equal(hdr->addr3, dev->dev_addr)) {
2215 		PDEBUG(DEBUG_AP, "handle_ap_item - addr3(BSSID)=%pM"
2216 		       " not own MAC\n", hdr->addr3);
2217 		goto done;
2218 	}
2219 
2220 	switch (stype) {
2221 	case IEEE80211_STYPE_ASSOC_REQ:
2222 		handle_assoc(local, skb, rx_stats, 0);
2223 		break;
2224 	case IEEE80211_STYPE_ASSOC_RESP:
2225 		PDEBUG(DEBUG_AP, "==> ASSOC RESP (ignored)\n");
2226 		break;
2227 	case IEEE80211_STYPE_REASSOC_REQ:
2228 		handle_assoc(local, skb, rx_stats, 1);
2229 		break;
2230 	case IEEE80211_STYPE_REASSOC_RESP:
2231 		PDEBUG(DEBUG_AP, "==> REASSOC RESP (ignored)\n");
2232 		break;
2233 	case IEEE80211_STYPE_ATIM:
2234 		PDEBUG(DEBUG_AP, "==> ATIM (ignored)\n");
2235 		break;
2236 	case IEEE80211_STYPE_DISASSOC:
2237 		handle_disassoc(local, skb, rx_stats);
2238 		break;
2239 	case IEEE80211_STYPE_AUTH:
2240 		handle_authen(local, skb, rx_stats);
2241 		break;
2242 	case IEEE80211_STYPE_DEAUTH:
2243 		handle_deauth(local, skb, rx_stats);
2244 		break;
2245 	default:
2246 		PDEBUG(DEBUG_AP, "Unknown mgmt frame subtype 0x%02x\n",
2247 		       stype >> 4);
2248 		break;
2249 	}
2250 #endif /* PRISM2_NO_KERNEL_IEEE80211_MGMT */
2251 
2252  done:
2253 	dev_kfree_skb(skb);
2254 }
2255 
2256 
2257 /* Called only as a tasklet (software IRQ) */
hostap_rx(struct net_device * dev,struct sk_buff * skb,struct hostap_80211_rx_status * rx_stats)2258 void hostap_rx(struct net_device *dev, struct sk_buff *skb,
2259 	       struct hostap_80211_rx_status *rx_stats)
2260 {
2261 	struct hostap_interface *iface;
2262 	local_info_t *local;
2263 	struct ieee80211_hdr *hdr;
2264 
2265 	iface = netdev_priv(dev);
2266 	local = iface->local;
2267 
2268 	if (skb->len < 16)
2269 		goto drop;
2270 
2271 	dev->stats.rx_packets++;
2272 
2273 	hdr = (struct ieee80211_hdr *) skb->data;
2274 
2275 	if (local->ap->ap_policy == AP_OTHER_AP_SKIP_ALL &&
2276 	    ieee80211_is_beacon(hdr->frame_control))
2277 		goto drop;
2278 
2279 	skb->protocol = cpu_to_be16(ETH_P_HOSTAP);
2280 	handle_ap_item(local, skb, rx_stats);
2281 	return;
2282 
2283  drop:
2284 	dev_kfree_skb(skb);
2285 }
2286 
2287 
2288 /* Called only as a tasklet (software IRQ) */
schedule_packet_send(local_info_t * local,struct sta_info * sta)2289 static void schedule_packet_send(local_info_t *local, struct sta_info *sta)
2290 {
2291 	struct sk_buff *skb;
2292 	struct ieee80211_hdr *hdr;
2293 	struct hostap_80211_rx_status rx_stats;
2294 
2295 	if (skb_queue_empty(&sta->tx_buf))
2296 		return;
2297 
2298 	skb = dev_alloc_skb(16);
2299 	if (skb == NULL) {
2300 		printk(KERN_DEBUG "%s: schedule_packet_send: skb alloc "
2301 		       "failed\n", local->dev->name);
2302 		return;
2303 	}
2304 
2305 	hdr = skb_put(skb, 16);
2306 
2307 	/* Generate a fake pspoll frame to start packet delivery */
2308 	hdr->frame_control = cpu_to_le16(
2309 		IEEE80211_FTYPE_CTL | IEEE80211_STYPE_PSPOLL);
2310 	memcpy(hdr->addr1, local->dev->dev_addr, ETH_ALEN);
2311 	memcpy(hdr->addr2, sta->addr, ETH_ALEN);
2312 	hdr->duration_id = cpu_to_le16(sta->aid | BIT(15) | BIT(14));
2313 
2314 	PDEBUG(DEBUG_PS2,
2315 	       "%s: Scheduling buffered packet delivery for STA %pM\n",
2316 	       local->dev->name, sta->addr);
2317 
2318 	skb->dev = local->dev;
2319 
2320 	memset(&rx_stats, 0, sizeof(rx_stats));
2321 	hostap_rx(local->dev, skb, &rx_stats);
2322 }
2323 
2324 
prism2_ap_get_sta_qual(local_info_t * local,struct sockaddr addr[],struct iw_quality qual[],int buf_size,int aplist)2325 int prism2_ap_get_sta_qual(local_info_t *local, struct sockaddr addr[],
2326 			   struct iw_quality qual[], int buf_size,
2327 			   int aplist)
2328 {
2329 	struct ap_data *ap = local->ap;
2330 	struct list_head *ptr;
2331 	int count = 0;
2332 
2333 	spin_lock_bh(&ap->sta_table_lock);
2334 
2335 	for (ptr = ap->sta_list.next; ptr != NULL && ptr != &ap->sta_list;
2336 	     ptr = ptr->next) {
2337 		struct sta_info *sta = (struct sta_info *) ptr;
2338 
2339 		if (aplist && !sta->ap)
2340 			continue;
2341 		addr[count].sa_family = ARPHRD_ETHER;
2342 		memcpy(addr[count].sa_data, sta->addr, ETH_ALEN);
2343 		if (sta->last_rx_silence == 0)
2344 			qual[count].qual = sta->last_rx_signal < 27 ?
2345 				0 : (sta->last_rx_signal - 27) * 92 / 127;
2346 		else
2347 			qual[count].qual = sta->last_rx_signal -
2348 				sta->last_rx_silence - 35;
2349 		qual[count].level = HFA384X_LEVEL_TO_dBm(sta->last_rx_signal);
2350 		qual[count].noise = HFA384X_LEVEL_TO_dBm(sta->last_rx_silence);
2351 		qual[count].updated = sta->last_rx_updated;
2352 
2353 		sta->last_rx_updated = IW_QUAL_DBM;
2354 
2355 		count++;
2356 		if (count >= buf_size)
2357 			break;
2358 	}
2359 	spin_unlock_bh(&ap->sta_table_lock);
2360 
2361 	return count;
2362 }
2363 
2364 
2365 /* Translate our list of Access Points & Stations to a card independent
2366  * format that the Wireless Tools will understand - Jean II */
prism2_ap_translate_scan(struct net_device * dev,struct iw_request_info * info,char * buffer)2367 int prism2_ap_translate_scan(struct net_device *dev,
2368 			     struct iw_request_info *info, char *buffer)
2369 {
2370 	struct hostap_interface *iface;
2371 	local_info_t *local;
2372 	struct ap_data *ap;
2373 	struct list_head *ptr;
2374 	struct iw_event iwe;
2375 	char *current_ev = buffer;
2376 	char *end_buf = buffer + IW_SCAN_MAX_DATA;
2377 #if !defined(PRISM2_NO_KERNEL_IEEE80211_MGMT)
2378 	char buf[64];
2379 #endif
2380 
2381 	iface = netdev_priv(dev);
2382 	local = iface->local;
2383 	ap = local->ap;
2384 
2385 	spin_lock_bh(&ap->sta_table_lock);
2386 
2387 	for (ptr = ap->sta_list.next; ptr != NULL && ptr != &ap->sta_list;
2388 	     ptr = ptr->next) {
2389 		struct sta_info *sta = (struct sta_info *) ptr;
2390 
2391 		/* First entry *MUST* be the AP MAC address */
2392 		memset(&iwe, 0, sizeof(iwe));
2393 		iwe.cmd = SIOCGIWAP;
2394 		iwe.u.ap_addr.sa_family = ARPHRD_ETHER;
2395 		memcpy(iwe.u.ap_addr.sa_data, sta->addr, ETH_ALEN);
2396 		iwe.len = IW_EV_ADDR_LEN;
2397 		current_ev = iwe_stream_add_event(info, current_ev, end_buf,
2398 						  &iwe, IW_EV_ADDR_LEN);
2399 
2400 		/* Use the mode to indicate if it's a station or
2401 		 * an Access Point */
2402 		memset(&iwe, 0, sizeof(iwe));
2403 		iwe.cmd = SIOCGIWMODE;
2404 		if (sta->ap)
2405 			iwe.u.mode = IW_MODE_MASTER;
2406 		else
2407 			iwe.u.mode = IW_MODE_INFRA;
2408 		iwe.len = IW_EV_UINT_LEN;
2409 		current_ev = iwe_stream_add_event(info, current_ev, end_buf,
2410 						  &iwe, IW_EV_UINT_LEN);
2411 
2412 		/* Some quality */
2413 		memset(&iwe, 0, sizeof(iwe));
2414 		iwe.cmd = IWEVQUAL;
2415 		if (sta->last_rx_silence == 0)
2416 			iwe.u.qual.qual = sta->last_rx_signal < 27 ?
2417 				0 : (sta->last_rx_signal - 27) * 92 / 127;
2418 		else
2419 			iwe.u.qual.qual = sta->last_rx_signal -
2420 				sta->last_rx_silence - 35;
2421 		iwe.u.qual.level = HFA384X_LEVEL_TO_dBm(sta->last_rx_signal);
2422 		iwe.u.qual.noise = HFA384X_LEVEL_TO_dBm(sta->last_rx_silence);
2423 		iwe.u.qual.updated = sta->last_rx_updated;
2424 		iwe.len = IW_EV_QUAL_LEN;
2425 		current_ev = iwe_stream_add_event(info, current_ev, end_buf,
2426 						  &iwe, IW_EV_QUAL_LEN);
2427 
2428 #ifndef PRISM2_NO_KERNEL_IEEE80211_MGMT
2429 		if (sta->ap) {
2430 			memset(&iwe, 0, sizeof(iwe));
2431 			iwe.cmd = SIOCGIWESSID;
2432 			iwe.u.data.length = sta->u.ap.ssid_len;
2433 			iwe.u.data.flags = 1;
2434 			current_ev = iwe_stream_add_point(info, current_ev,
2435 							  end_buf, &iwe,
2436 							  sta->u.ap.ssid);
2437 
2438 			memset(&iwe, 0, sizeof(iwe));
2439 			iwe.cmd = SIOCGIWENCODE;
2440 			if (sta->capability & WLAN_CAPABILITY_PRIVACY)
2441 				iwe.u.data.flags =
2442 					IW_ENCODE_ENABLED | IW_ENCODE_NOKEY;
2443 			else
2444 				iwe.u.data.flags = IW_ENCODE_DISABLED;
2445 			current_ev = iwe_stream_add_point(info, current_ev,
2446 							  end_buf, &iwe,
2447 							  sta->u.ap.ssid);
2448 
2449 			if (sta->u.ap.channel > 0 &&
2450 			    sta->u.ap.channel <= FREQ_COUNT) {
2451 				memset(&iwe, 0, sizeof(iwe));
2452 				iwe.cmd = SIOCGIWFREQ;
2453 				iwe.u.freq.m = freq_list[sta->u.ap.channel - 1]
2454 					* 100000;
2455 				iwe.u.freq.e = 1;
2456 				current_ev = iwe_stream_add_event(
2457 					info, current_ev, end_buf, &iwe,
2458 					IW_EV_FREQ_LEN);
2459 			}
2460 
2461 			memset(&iwe, 0, sizeof(iwe));
2462 			iwe.cmd = IWEVCUSTOM;
2463 			sprintf(buf, "beacon_interval=%d",
2464 				sta->listen_interval);
2465 			iwe.u.data.length = strlen(buf);
2466 			current_ev = iwe_stream_add_point(info, current_ev,
2467 							  end_buf, &iwe, buf);
2468 		}
2469 #endif /* PRISM2_NO_KERNEL_IEEE80211_MGMT */
2470 
2471 		sta->last_rx_updated = IW_QUAL_DBM;
2472 
2473 		/* To be continued, we should make good use of IWEVCUSTOM */
2474 	}
2475 
2476 	spin_unlock_bh(&ap->sta_table_lock);
2477 
2478 	return current_ev - buffer;
2479 }
2480 
2481 
prism2_hostapd_add_sta(struct ap_data * ap,struct prism2_hostapd_param * param)2482 static int prism2_hostapd_add_sta(struct ap_data *ap,
2483 				  struct prism2_hostapd_param *param)
2484 {
2485 	struct sta_info *sta;
2486 
2487 	spin_lock_bh(&ap->sta_table_lock);
2488 	sta = ap_get_sta(ap, param->sta_addr);
2489 	if (sta)
2490 		atomic_inc(&sta->users);
2491 	spin_unlock_bh(&ap->sta_table_lock);
2492 
2493 	if (sta == NULL) {
2494 		sta = ap_add_sta(ap, param->sta_addr);
2495 		if (sta == NULL)
2496 			return -1;
2497 	}
2498 
2499 	if (!(sta->flags & WLAN_STA_ASSOC) && !sta->ap && sta->local)
2500 		hostap_event_new_sta(sta->local->dev, sta);
2501 
2502 	sta->flags |= WLAN_STA_AUTH | WLAN_STA_ASSOC;
2503 	sta->last_rx = jiffies;
2504 	sta->aid = param->u.add_sta.aid;
2505 	sta->capability = param->u.add_sta.capability;
2506 	sta->tx_supp_rates = param->u.add_sta.tx_supp_rates;
2507 	if (sta->tx_supp_rates & WLAN_RATE_1M)
2508 		sta->supported_rates[0] = 2;
2509 	if (sta->tx_supp_rates & WLAN_RATE_2M)
2510 		sta->supported_rates[1] = 4;
2511 	if (sta->tx_supp_rates & WLAN_RATE_5M5)
2512 		sta->supported_rates[2] = 11;
2513 	if (sta->tx_supp_rates & WLAN_RATE_11M)
2514 		sta->supported_rates[3] = 22;
2515 	prism2_check_tx_rates(sta);
2516 	atomic_dec(&sta->users);
2517 	return 0;
2518 }
2519 
2520 
prism2_hostapd_remove_sta(struct ap_data * ap,struct prism2_hostapd_param * param)2521 static int prism2_hostapd_remove_sta(struct ap_data *ap,
2522 				     struct prism2_hostapd_param *param)
2523 {
2524 	struct sta_info *sta;
2525 
2526 	spin_lock_bh(&ap->sta_table_lock);
2527 	sta = ap_get_sta(ap, param->sta_addr);
2528 	if (sta) {
2529 		ap_sta_hash_del(ap, sta);
2530 		list_del(&sta->list);
2531 	}
2532 	spin_unlock_bh(&ap->sta_table_lock);
2533 
2534 	if (!sta)
2535 		return -ENOENT;
2536 
2537 	if ((sta->flags & WLAN_STA_ASSOC) && !sta->ap && sta->local)
2538 		hostap_event_expired_sta(sta->local->dev, sta);
2539 	ap_free_sta(ap, sta);
2540 
2541 	return 0;
2542 }
2543 
2544 
prism2_hostapd_get_info_sta(struct ap_data * ap,struct prism2_hostapd_param * param)2545 static int prism2_hostapd_get_info_sta(struct ap_data *ap,
2546 				       struct prism2_hostapd_param *param)
2547 {
2548 	struct sta_info *sta;
2549 
2550 	spin_lock_bh(&ap->sta_table_lock);
2551 	sta = ap_get_sta(ap, param->sta_addr);
2552 	if (sta)
2553 		atomic_inc(&sta->users);
2554 	spin_unlock_bh(&ap->sta_table_lock);
2555 
2556 	if (!sta)
2557 		return -ENOENT;
2558 
2559 	param->u.get_info_sta.inactive_sec = (jiffies - sta->last_rx) / HZ;
2560 
2561 	atomic_dec(&sta->users);
2562 
2563 	return 1;
2564 }
2565 
2566 
prism2_hostapd_set_flags_sta(struct ap_data * ap,struct prism2_hostapd_param * param)2567 static int prism2_hostapd_set_flags_sta(struct ap_data *ap,
2568 					struct prism2_hostapd_param *param)
2569 {
2570 	struct sta_info *sta;
2571 
2572 	spin_lock_bh(&ap->sta_table_lock);
2573 	sta = ap_get_sta(ap, param->sta_addr);
2574 	if (sta) {
2575 		sta->flags |= param->u.set_flags_sta.flags_or;
2576 		sta->flags &= param->u.set_flags_sta.flags_and;
2577 	}
2578 	spin_unlock_bh(&ap->sta_table_lock);
2579 
2580 	if (!sta)
2581 		return -ENOENT;
2582 
2583 	return 0;
2584 }
2585 
2586 
prism2_hostapd_sta_clear_stats(struct ap_data * ap,struct prism2_hostapd_param * param)2587 static int prism2_hostapd_sta_clear_stats(struct ap_data *ap,
2588 					  struct prism2_hostapd_param *param)
2589 {
2590 	struct sta_info *sta;
2591 	int rate;
2592 
2593 	spin_lock_bh(&ap->sta_table_lock);
2594 	sta = ap_get_sta(ap, param->sta_addr);
2595 	if (sta) {
2596 		sta->rx_packets = sta->tx_packets = 0;
2597 		sta->rx_bytes = sta->tx_bytes = 0;
2598 		for (rate = 0; rate < WLAN_RATE_COUNT; rate++) {
2599 			sta->tx_count[rate] = 0;
2600 			sta->rx_count[rate] = 0;
2601 		}
2602 	}
2603 	spin_unlock_bh(&ap->sta_table_lock);
2604 
2605 	if (!sta)
2606 		return -ENOENT;
2607 
2608 	return 0;
2609 }
2610 
2611 
prism2_hostapd(struct ap_data * ap,struct prism2_hostapd_param * param)2612 int prism2_hostapd(struct ap_data *ap, struct prism2_hostapd_param *param)
2613 {
2614 	switch (param->cmd) {
2615 	case PRISM2_HOSTAPD_FLUSH:
2616 		ap_control_kickall(ap);
2617 		return 0;
2618 	case PRISM2_HOSTAPD_ADD_STA:
2619 		return prism2_hostapd_add_sta(ap, param);
2620 	case PRISM2_HOSTAPD_REMOVE_STA:
2621 		return prism2_hostapd_remove_sta(ap, param);
2622 	case PRISM2_HOSTAPD_GET_INFO_STA:
2623 		return prism2_hostapd_get_info_sta(ap, param);
2624 	case PRISM2_HOSTAPD_SET_FLAGS_STA:
2625 		return prism2_hostapd_set_flags_sta(ap, param);
2626 	case PRISM2_HOSTAPD_STA_CLEAR_STATS:
2627 		return prism2_hostapd_sta_clear_stats(ap, param);
2628 	default:
2629 		printk(KERN_WARNING "prism2_hostapd: unknown cmd=%d\n",
2630 		       param->cmd);
2631 		return -EOPNOTSUPP;
2632 	}
2633 }
2634 
2635 
2636 /* Update station info for host-based TX rate control and return current
2637  * TX rate */
ap_update_sta_tx_rate(struct sta_info * sta,struct net_device * dev)2638 static int ap_update_sta_tx_rate(struct sta_info *sta, struct net_device *dev)
2639 {
2640 	int ret = sta->tx_rate;
2641 	struct hostap_interface *iface;
2642 	local_info_t *local;
2643 
2644 	iface = netdev_priv(dev);
2645 	local = iface->local;
2646 
2647 	sta->tx_count[sta->tx_rate_idx]++;
2648 	sta->tx_since_last_failure++;
2649 	sta->tx_consecutive_exc = 0;
2650 	if (sta->tx_since_last_failure >= WLAN_RATE_UPDATE_COUNT &&
2651 	    sta->tx_rate_idx < sta->tx_max_rate) {
2652 		/* use next higher rate */
2653 		int old_rate, new_rate;
2654 		old_rate = new_rate = sta->tx_rate_idx;
2655 		while (new_rate < sta->tx_max_rate) {
2656 			new_rate++;
2657 			if (ap_tx_rate_ok(new_rate, sta, local)) {
2658 				sta->tx_rate_idx = new_rate;
2659 				break;
2660 			}
2661 		}
2662 		if (old_rate != sta->tx_rate_idx) {
2663 			switch (sta->tx_rate_idx) {
2664 			case 0: sta->tx_rate = 10; break;
2665 			case 1: sta->tx_rate = 20; break;
2666 			case 2: sta->tx_rate = 55; break;
2667 			case 3: sta->tx_rate = 110; break;
2668 			default: sta->tx_rate = 0; break;
2669 			}
2670 			PDEBUG(DEBUG_AP, "%s: STA %pM TX rate raised to %d\n",
2671 			       dev->name, sta->addr, sta->tx_rate);
2672 		}
2673 		sta->tx_since_last_failure = 0;
2674 	}
2675 
2676 	return ret;
2677 }
2678 
2679 
2680 /* Called only from software IRQ. Called for each TX frame prior possible
2681  * encryption and transmit. */
hostap_handle_sta_tx(local_info_t * local,struct hostap_tx_data * tx)2682 ap_tx_ret hostap_handle_sta_tx(local_info_t *local, struct hostap_tx_data *tx)
2683 {
2684 	struct sta_info *sta = NULL;
2685 	struct sk_buff *skb = tx->skb;
2686 	int set_tim, ret;
2687 	struct ieee80211_hdr *hdr;
2688 	struct hostap_skb_tx_data *meta;
2689 
2690 	meta = (struct hostap_skb_tx_data *) skb->cb;
2691 	ret = AP_TX_CONTINUE;
2692 	if (local->ap == NULL || skb->len < 10 ||
2693 	    meta->iface->type == HOSTAP_INTERFACE_STA)
2694 		goto out;
2695 
2696 	hdr = (struct ieee80211_hdr *) skb->data;
2697 
2698 	if (hdr->addr1[0] & 0x01) {
2699 		/* broadcast/multicast frame - no AP related processing */
2700 		if (local->ap->num_sta <= 0)
2701 			ret = AP_TX_DROP;
2702 		goto out;
2703 	}
2704 
2705 	/* unicast packet - check whether destination STA is associated */
2706 	spin_lock(&local->ap->sta_table_lock);
2707 	sta = ap_get_sta(local->ap, hdr->addr1);
2708 	if (sta)
2709 		atomic_inc(&sta->users);
2710 	spin_unlock(&local->ap->sta_table_lock);
2711 
2712 	if (local->iw_mode == IW_MODE_MASTER && sta == NULL &&
2713 	    !(meta->flags & HOSTAP_TX_FLAGS_WDS) &&
2714 	    meta->iface->type != HOSTAP_INTERFACE_MASTER &&
2715 	    meta->iface->type != HOSTAP_INTERFACE_AP) {
2716 #if 0
2717 		/* This can happen, e.g., when wlan0 is added to a bridge and
2718 		 * bridging code does not know which port is the correct target
2719 		 * for a unicast frame. In this case, the packet is send to all
2720 		 * ports of the bridge. Since this is a valid scenario, do not
2721 		 * print out any errors here. */
2722 		if (net_ratelimit()) {
2723 			printk(KERN_DEBUG "AP: drop packet to non-associated "
2724 			       "STA %pM\n", hdr->addr1);
2725 		}
2726 #endif
2727 		local->ap->tx_drop_nonassoc++;
2728 		ret = AP_TX_DROP;
2729 		goto out;
2730 	}
2731 
2732 	if (sta == NULL)
2733 		goto out;
2734 
2735 	if (!(sta->flags & WLAN_STA_AUTHORIZED))
2736 		ret = AP_TX_CONTINUE_NOT_AUTHORIZED;
2737 
2738 	/* Set tx_rate if using host-based TX rate control */
2739 	if (!local->fw_tx_rate_control)
2740 		local->ap->last_tx_rate = meta->rate =
2741 			ap_update_sta_tx_rate(sta, local->dev);
2742 
2743 	if (local->iw_mode != IW_MODE_MASTER)
2744 		goto out;
2745 
2746 	if (!(sta->flags & WLAN_STA_PS))
2747 		goto out;
2748 
2749 	if (meta->flags & HOSTAP_TX_FLAGS_ADD_MOREDATA) {
2750 		/* indicate to STA that more frames follow */
2751 		hdr->frame_control |=
2752 			cpu_to_le16(IEEE80211_FCTL_MOREDATA);
2753 	}
2754 
2755 	if (meta->flags & HOSTAP_TX_FLAGS_BUFFERED_FRAME) {
2756 		/* packet was already buffered and now send due to
2757 		 * PS poll, so do not rebuffer it */
2758 		goto out;
2759 	}
2760 
2761 	if (skb_queue_len(&sta->tx_buf) >= STA_MAX_TX_BUFFER) {
2762 		PDEBUG(DEBUG_PS, "%s: No more space in STA (%pM)'s"
2763 		       "PS mode buffer\n",
2764 		       local->dev->name, sta->addr);
2765 		/* Make sure that TIM is set for the station (it might not be
2766 		 * after AP wlan hw reset). */
2767 		/* FIX: should fix hw reset to restore bits based on STA
2768 		 * buffer state.. */
2769 		hostap_set_tim(local, sta->aid, 1);
2770 		sta->flags |= WLAN_STA_TIM;
2771 		ret = AP_TX_DROP;
2772 		goto out;
2773 	}
2774 
2775 	/* STA in PS mode, buffer frame for later delivery */
2776 	set_tim = skb_queue_empty(&sta->tx_buf);
2777 	skb_queue_tail(&sta->tx_buf, skb);
2778 	/* FIX: could save RX time to skb and expire buffered frames after
2779 	 * some time if STA does not poll for them */
2780 
2781 	if (set_tim) {
2782 		if (sta->flags & WLAN_STA_TIM)
2783 			PDEBUG(DEBUG_PS2, "Re-setting TIM for aid %d\n",
2784 			       sta->aid);
2785 		hostap_set_tim(local, sta->aid, 1);
2786 		sta->flags |= WLAN_STA_TIM;
2787 	}
2788 
2789 	ret = AP_TX_BUFFERED;
2790 
2791  out:
2792 	if (sta != NULL) {
2793 		if (ret == AP_TX_CONTINUE ||
2794 		    ret == AP_TX_CONTINUE_NOT_AUTHORIZED) {
2795 			sta->tx_packets++;
2796 			sta->tx_bytes += skb->len;
2797 			sta->last_tx = jiffies;
2798 		}
2799 
2800 		if ((ret == AP_TX_CONTINUE ||
2801 		     ret == AP_TX_CONTINUE_NOT_AUTHORIZED) &&
2802 		    sta->crypt && tx->host_encrypt) {
2803 			tx->crypt = sta->crypt;
2804 			tx->sta_ptr = sta; /* hostap_handle_sta_release() will
2805 					    * be called to release sta info
2806 					    * later */
2807 		} else
2808 			atomic_dec(&sta->users);
2809 	}
2810 
2811 	return ret;
2812 }
2813 
2814 
hostap_handle_sta_release(void * ptr)2815 void hostap_handle_sta_release(void *ptr)
2816 {
2817 	struct sta_info *sta = ptr;
2818 	atomic_dec(&sta->users);
2819 }
2820 
2821 
2822 /* Called only as a tasklet (software IRQ) */
hostap_handle_sta_tx_exc(local_info_t * local,struct sk_buff * skb)2823 void hostap_handle_sta_tx_exc(local_info_t *local, struct sk_buff *skb)
2824 {
2825 	struct sta_info *sta;
2826 	struct ieee80211_hdr *hdr;
2827 	struct hostap_skb_tx_data *meta;
2828 
2829 	hdr = (struct ieee80211_hdr *) skb->data;
2830 	meta = (struct hostap_skb_tx_data *) skb->cb;
2831 
2832 	spin_lock(&local->ap->sta_table_lock);
2833 	sta = ap_get_sta(local->ap, hdr->addr1);
2834 	if (!sta) {
2835 		spin_unlock(&local->ap->sta_table_lock);
2836 		PDEBUG(DEBUG_AP, "%s: Could not find STA %pM"
2837 		       " for this TX error (@%lu)\n",
2838 		       local->dev->name, hdr->addr1, jiffies);
2839 		return;
2840 	}
2841 
2842 	sta->tx_since_last_failure = 0;
2843 	sta->tx_consecutive_exc++;
2844 
2845 	if (sta->tx_consecutive_exc >= WLAN_RATE_DECREASE_THRESHOLD &&
2846 	    sta->tx_rate_idx > 0 && meta->rate <= sta->tx_rate) {
2847 		/* use next lower rate */
2848 		int old, rate;
2849 		old = rate = sta->tx_rate_idx;
2850 		while (rate > 0) {
2851 			rate--;
2852 			if (ap_tx_rate_ok(rate, sta, local)) {
2853 				sta->tx_rate_idx = rate;
2854 				break;
2855 			}
2856 		}
2857 		if (old != sta->tx_rate_idx) {
2858 			switch (sta->tx_rate_idx) {
2859 			case 0: sta->tx_rate = 10; break;
2860 			case 1: sta->tx_rate = 20; break;
2861 			case 2: sta->tx_rate = 55; break;
2862 			case 3: sta->tx_rate = 110; break;
2863 			default: sta->tx_rate = 0; break;
2864 			}
2865 			PDEBUG(DEBUG_AP,
2866 			       "%s: STA %pM TX rate lowered to %d\n",
2867 			       local->dev->name, sta->addr, sta->tx_rate);
2868 		}
2869 		sta->tx_consecutive_exc = 0;
2870 	}
2871 	spin_unlock(&local->ap->sta_table_lock);
2872 }
2873 
2874 
hostap_update_sta_ps2(local_info_t * local,struct sta_info * sta,int pwrmgt,int type,int stype)2875 static void hostap_update_sta_ps2(local_info_t *local, struct sta_info *sta,
2876 				  int pwrmgt, int type, int stype)
2877 {
2878 	if (pwrmgt && !(sta->flags & WLAN_STA_PS)) {
2879 		sta->flags |= WLAN_STA_PS;
2880 		PDEBUG(DEBUG_PS2, "STA %pM changed to use PS "
2881 		       "mode (type=0x%02X, stype=0x%02X)\n",
2882 		       sta->addr, type >> 2, stype >> 4);
2883 	} else if (!pwrmgt && (sta->flags & WLAN_STA_PS)) {
2884 		sta->flags &= ~WLAN_STA_PS;
2885 		PDEBUG(DEBUG_PS2, "STA %pM changed to not use "
2886 		       "PS mode (type=0x%02X, stype=0x%02X)\n",
2887 		       sta->addr, type >> 2, stype >> 4);
2888 		if (type != IEEE80211_FTYPE_CTL ||
2889 		    stype != IEEE80211_STYPE_PSPOLL)
2890 			schedule_packet_send(local, sta);
2891 	}
2892 }
2893 
2894 
2895 /* Called only as a tasklet (software IRQ). Called for each RX frame to update
2896  * STA power saving state. pwrmgt is a flag from 802.11 frame_control field. */
hostap_update_sta_ps(local_info_t * local,struct ieee80211_hdr * hdr)2897 int hostap_update_sta_ps(local_info_t *local, struct ieee80211_hdr *hdr)
2898 {
2899 	struct sta_info *sta;
2900 	u16 fc;
2901 
2902 	spin_lock(&local->ap->sta_table_lock);
2903 	sta = ap_get_sta(local->ap, hdr->addr2);
2904 	if (sta)
2905 		atomic_inc(&sta->users);
2906 	spin_unlock(&local->ap->sta_table_lock);
2907 
2908 	if (!sta)
2909 		return -1;
2910 
2911 	fc = le16_to_cpu(hdr->frame_control);
2912 	hostap_update_sta_ps2(local, sta, fc & IEEE80211_FCTL_PM,
2913 			      fc & IEEE80211_FCTL_FTYPE,
2914 			      fc & IEEE80211_FCTL_STYPE);
2915 
2916 	atomic_dec(&sta->users);
2917 	return 0;
2918 }
2919 
2920 
2921 /* Called only as a tasklet (software IRQ). Called for each RX frame after
2922  * getting RX header and payload from hardware. */
hostap_handle_sta_rx(local_info_t * local,struct net_device * dev,struct sk_buff * skb,struct hostap_80211_rx_status * rx_stats,int wds)2923 ap_rx_ret hostap_handle_sta_rx(local_info_t *local, struct net_device *dev,
2924 			       struct sk_buff *skb,
2925 			       struct hostap_80211_rx_status *rx_stats,
2926 			       int wds)
2927 {
2928 	int ret;
2929 	struct sta_info *sta;
2930 	u16 fc, type, stype;
2931 	struct ieee80211_hdr *hdr;
2932 
2933 	if (local->ap == NULL)
2934 		return AP_RX_CONTINUE;
2935 
2936 	hdr = (struct ieee80211_hdr *) skb->data;
2937 
2938 	fc = le16_to_cpu(hdr->frame_control);
2939 	type = fc & IEEE80211_FCTL_FTYPE;
2940 	stype = fc & IEEE80211_FCTL_STYPE;
2941 
2942 	spin_lock(&local->ap->sta_table_lock);
2943 	sta = ap_get_sta(local->ap, hdr->addr2);
2944 	if (sta)
2945 		atomic_inc(&sta->users);
2946 	spin_unlock(&local->ap->sta_table_lock);
2947 
2948 	if (sta && !(sta->flags & WLAN_STA_AUTHORIZED))
2949 		ret = AP_RX_CONTINUE_NOT_AUTHORIZED;
2950 	else
2951 		ret = AP_RX_CONTINUE;
2952 
2953 
2954 	if (fc & IEEE80211_FCTL_TODS) {
2955 		if (!wds && (sta == NULL || !(sta->flags & WLAN_STA_ASSOC))) {
2956 			if (local->hostapd) {
2957 				prism2_rx_80211(local->apdev, skb, rx_stats,
2958 						PRISM2_RX_NON_ASSOC);
2959 #ifndef PRISM2_NO_KERNEL_IEEE80211_MGMT
2960 			} else {
2961 				printk(KERN_DEBUG "%s: dropped received packet"
2962 				       " from non-associated STA %pM"
2963 				       " (type=0x%02x, subtype=0x%02x)\n",
2964 				       dev->name, hdr->addr2,
2965 				       type >> 2, stype >> 4);
2966 				hostap_rx(dev, skb, rx_stats);
2967 #endif /* PRISM2_NO_KERNEL_IEEE80211_MGMT */
2968 			}
2969 			ret = AP_RX_EXIT;
2970 			goto out;
2971 		}
2972 	} else if (fc & IEEE80211_FCTL_FROMDS) {
2973 		if (!wds) {
2974 			/* FromDS frame - not for us; probably
2975 			 * broadcast/multicast in another BSS - drop */
2976 			if (ether_addr_equal(hdr->addr1, dev->dev_addr)) {
2977 				printk(KERN_DEBUG "Odd.. FromDS packet "
2978 				       "received with own BSSID\n");
2979 				hostap_dump_rx_80211(dev->name, skb, rx_stats);
2980 			}
2981 			ret = AP_RX_DROP;
2982 			goto out;
2983 		}
2984 	} else if (stype == IEEE80211_STYPE_NULLFUNC && sta == NULL &&
2985 		   ether_addr_equal(hdr->addr1, dev->dev_addr)) {
2986 
2987 		if (local->hostapd) {
2988 			prism2_rx_80211(local->apdev, skb, rx_stats,
2989 					PRISM2_RX_NON_ASSOC);
2990 #ifndef PRISM2_NO_KERNEL_IEEE80211_MGMT
2991 		} else {
2992 			/* At least Lucent f/w seems to send data::nullfunc
2993 			 * frames with no ToDS flag when the current AP returns
2994 			 * after being unavailable for some time. Speed up
2995 			 * re-association by informing the station about it not
2996 			 * being associated. */
2997 			printk(KERN_DEBUG "%s: rejected received nullfunc frame"
2998 			       " without ToDS from not associated STA %pM\n",
2999 			       dev->name, hdr->addr2);
3000 			hostap_rx(dev, skb, rx_stats);
3001 #endif /* PRISM2_NO_KERNEL_IEEE80211_MGMT */
3002 		}
3003 		ret = AP_RX_EXIT;
3004 		goto out;
3005 	} else if (stype == IEEE80211_STYPE_NULLFUNC) {
3006 		/* At least Lucent cards seem to send periodic nullfunc
3007 		 * frames with ToDS. Let these through to update SQ
3008 		 * stats and PS state. Nullfunc frames do not contain
3009 		 * any data and they will be dropped below. */
3010 	} else {
3011 		/* If BSSID (Addr3) is foreign, this frame is a normal
3012 		 * broadcast frame from an IBSS network. Drop it silently.
3013 		 * If BSSID is own, report the dropping of this frame. */
3014 		if (ether_addr_equal(hdr->addr3, dev->dev_addr)) {
3015 			printk(KERN_DEBUG "%s: dropped received packet from %pM"
3016 			       " with no ToDS flag "
3017 			       "(type=0x%02x, subtype=0x%02x)\n", dev->name,
3018 			       hdr->addr2, type >> 2, stype >> 4);
3019 			hostap_dump_rx_80211(dev->name, skb, rx_stats);
3020 		}
3021 		ret = AP_RX_DROP;
3022 		goto out;
3023 	}
3024 
3025 	if (sta) {
3026 		hostap_update_sta_ps2(local, sta, fc & IEEE80211_FCTL_PM,
3027 				      type, stype);
3028 
3029 		sta->rx_packets++;
3030 		sta->rx_bytes += skb->len;
3031 		sta->last_rx = jiffies;
3032 	}
3033 
3034 	if (local->ap->nullfunc_ack && stype == IEEE80211_STYPE_NULLFUNC &&
3035 	    fc & IEEE80211_FCTL_TODS) {
3036 		if (local->hostapd) {
3037 			prism2_rx_80211(local->apdev, skb, rx_stats,
3038 					PRISM2_RX_NULLFUNC_ACK);
3039 #ifndef PRISM2_NO_KERNEL_IEEE80211_MGMT
3040 		} else {
3041 			/* some STA f/w's seem to require control::ACK frame
3042 			 * for data::nullfunc, but Prism2 f/w 0.8.0 (at least
3043 			 * from Compaq) does not send this.. Try to generate
3044 			 * ACK for these frames from the host driver to make
3045 			 * power saving work with, e.g., Lucent WaveLAN f/w */
3046 			hostap_rx(dev, skb, rx_stats);
3047 #endif /* PRISM2_NO_KERNEL_IEEE80211_MGMT */
3048 		}
3049 		ret = AP_RX_EXIT;
3050 		goto out;
3051 	}
3052 
3053  out:
3054 	if (sta)
3055 		atomic_dec(&sta->users);
3056 
3057 	return ret;
3058 }
3059 
3060 
3061 /* Called only as a tasklet (software IRQ) */
hostap_handle_sta_crypto(local_info_t * local,struct ieee80211_hdr * hdr,struct lib80211_crypt_data ** crypt,void ** sta_ptr)3062 int hostap_handle_sta_crypto(local_info_t *local,
3063 			     struct ieee80211_hdr *hdr,
3064 			     struct lib80211_crypt_data **crypt,
3065 			     void **sta_ptr)
3066 {
3067 	struct sta_info *sta;
3068 
3069 	spin_lock(&local->ap->sta_table_lock);
3070 	sta = ap_get_sta(local->ap, hdr->addr2);
3071 	if (sta)
3072 		atomic_inc(&sta->users);
3073 	spin_unlock(&local->ap->sta_table_lock);
3074 
3075 	if (!sta)
3076 		return -1;
3077 
3078 	if (sta->crypt) {
3079 		*crypt = sta->crypt;
3080 		*sta_ptr = sta;
3081 		/* hostap_handle_sta_release() will be called to release STA
3082 		 * info */
3083 	} else
3084 		atomic_dec(&sta->users);
3085 
3086 	return 0;
3087 }
3088 
3089 
3090 /* Called only as a tasklet (software IRQ) */
hostap_is_sta_assoc(struct ap_data * ap,u8 * sta_addr)3091 int hostap_is_sta_assoc(struct ap_data *ap, u8 *sta_addr)
3092 {
3093 	struct sta_info *sta;
3094 	int ret = 0;
3095 
3096 	spin_lock(&ap->sta_table_lock);
3097 	sta = ap_get_sta(ap, sta_addr);
3098 	if (sta != NULL && (sta->flags & WLAN_STA_ASSOC) && !sta->ap)
3099 		ret = 1;
3100 	spin_unlock(&ap->sta_table_lock);
3101 
3102 	return ret;
3103 }
3104 
3105 
3106 /* Called only as a tasklet (software IRQ) */
hostap_is_sta_authorized(struct ap_data * ap,u8 * sta_addr)3107 int hostap_is_sta_authorized(struct ap_data *ap, u8 *sta_addr)
3108 {
3109 	struct sta_info *sta;
3110 	int ret = 0;
3111 
3112 	spin_lock(&ap->sta_table_lock);
3113 	sta = ap_get_sta(ap, sta_addr);
3114 	if (sta != NULL && (sta->flags & WLAN_STA_ASSOC) && !sta->ap &&
3115 	    ((sta->flags & WLAN_STA_AUTHORIZED) ||
3116 	     ap->local->ieee_802_1x == 0))
3117 		ret = 1;
3118 	spin_unlock(&ap->sta_table_lock);
3119 
3120 	return ret;
3121 }
3122 
3123 
3124 /* Called only as a tasklet (software IRQ) */
hostap_add_sta(struct ap_data * ap,u8 * sta_addr)3125 int hostap_add_sta(struct ap_data *ap, u8 *sta_addr)
3126 {
3127 	struct sta_info *sta;
3128 	int ret = 1;
3129 
3130 	if (!ap)
3131 		return -1;
3132 
3133 	spin_lock(&ap->sta_table_lock);
3134 	sta = ap_get_sta(ap, sta_addr);
3135 	if (sta)
3136 		ret = 0;
3137 	spin_unlock(&ap->sta_table_lock);
3138 
3139 	if (ret == 1) {
3140 		sta = ap_add_sta(ap, sta_addr);
3141 		if (!sta)
3142 			return -1;
3143 		sta->flags = WLAN_STA_AUTH | WLAN_STA_ASSOC;
3144 		sta->ap = 1;
3145 		memset(sta->supported_rates, 0, sizeof(sta->supported_rates));
3146 		/* No way of knowing which rates are supported since we did not
3147 		 * get supported rates element from beacon/assoc req. Assume
3148 		 * that remote end supports all 802.11b rates. */
3149 		sta->supported_rates[0] = 0x82;
3150 		sta->supported_rates[1] = 0x84;
3151 		sta->supported_rates[2] = 0x0b;
3152 		sta->supported_rates[3] = 0x16;
3153 		sta->tx_supp_rates = WLAN_RATE_1M | WLAN_RATE_2M |
3154 			WLAN_RATE_5M5 | WLAN_RATE_11M;
3155 		sta->tx_rate = 110;
3156 		sta->tx_max_rate = sta->tx_rate_idx = 3;
3157 	}
3158 
3159 	return ret;
3160 }
3161 
3162 
3163 /* Called only as a tasklet (software IRQ) */
hostap_update_rx_stats(struct ap_data * ap,struct ieee80211_hdr * hdr,struct hostap_80211_rx_status * rx_stats)3164 int hostap_update_rx_stats(struct ap_data *ap,
3165 			   struct ieee80211_hdr *hdr,
3166 			   struct hostap_80211_rx_status *rx_stats)
3167 {
3168 	struct sta_info *sta;
3169 
3170 	if (!ap)
3171 		return -1;
3172 
3173 	spin_lock(&ap->sta_table_lock);
3174 	sta = ap_get_sta(ap, hdr->addr2);
3175 	if (sta) {
3176 		sta->last_rx_silence = rx_stats->noise;
3177 		sta->last_rx_signal = rx_stats->signal;
3178 		sta->last_rx_rate = rx_stats->rate;
3179 		sta->last_rx_updated = IW_QUAL_ALL_UPDATED | IW_QUAL_DBM;
3180 		if (rx_stats->rate == 10)
3181 			sta->rx_count[0]++;
3182 		else if (rx_stats->rate == 20)
3183 			sta->rx_count[1]++;
3184 		else if (rx_stats->rate == 55)
3185 			sta->rx_count[2]++;
3186 		else if (rx_stats->rate == 110)
3187 			sta->rx_count[3]++;
3188 	}
3189 	spin_unlock(&ap->sta_table_lock);
3190 
3191 	return sta ? 0 : -1;
3192 }
3193 
3194 
hostap_update_rates(local_info_t * local)3195 void hostap_update_rates(local_info_t *local)
3196 {
3197 	struct sta_info *sta;
3198 	struct ap_data *ap = local->ap;
3199 
3200 	if (!ap)
3201 		return;
3202 
3203 	spin_lock_bh(&ap->sta_table_lock);
3204 	list_for_each_entry(sta, &ap->sta_list, list) {
3205 		prism2_check_tx_rates(sta);
3206 	}
3207 	spin_unlock_bh(&ap->sta_table_lock);
3208 }
3209 
3210 
ap_crypt_get_ptrs(struct ap_data * ap,u8 * addr,int permanent,struct lib80211_crypt_data *** crypt)3211 void * ap_crypt_get_ptrs(struct ap_data *ap, u8 *addr, int permanent,
3212 			 struct lib80211_crypt_data ***crypt)
3213 {
3214 	struct sta_info *sta;
3215 
3216 	spin_lock_bh(&ap->sta_table_lock);
3217 	sta = ap_get_sta(ap, addr);
3218 	if (sta)
3219 		atomic_inc(&sta->users);
3220 	spin_unlock_bh(&ap->sta_table_lock);
3221 
3222 	if (!sta && permanent)
3223 		sta = ap_add_sta(ap, addr);
3224 
3225 	if (!sta)
3226 		return NULL;
3227 
3228 	if (permanent)
3229 		sta->flags |= WLAN_STA_PERM;
3230 
3231 	*crypt = &sta->crypt;
3232 
3233 	return sta;
3234 }
3235 
3236 
hostap_add_wds_links(local_info_t * local)3237 void hostap_add_wds_links(local_info_t *local)
3238 {
3239 	struct ap_data *ap = local->ap;
3240 	struct sta_info *sta;
3241 
3242 	spin_lock_bh(&ap->sta_table_lock);
3243 	list_for_each_entry(sta, &ap->sta_list, list) {
3244 		if (sta->ap)
3245 			hostap_wds_link_oper(local, sta->addr, WDS_ADD);
3246 	}
3247 	spin_unlock_bh(&ap->sta_table_lock);
3248 
3249 	schedule_work(&local->ap->wds_oper_queue);
3250 }
3251 
3252 
hostap_wds_link_oper(local_info_t * local,u8 * addr,wds_oper_type type)3253 void hostap_wds_link_oper(local_info_t *local, u8 *addr, wds_oper_type type)
3254 {
3255 	struct wds_oper_data *entry;
3256 
3257 	entry = kmalloc(sizeof(*entry), GFP_ATOMIC);
3258 	if (!entry)
3259 		return;
3260 	memcpy(entry->addr, addr, ETH_ALEN);
3261 	entry->type = type;
3262 	spin_lock_bh(&local->lock);
3263 	entry->next = local->ap->wds_oper_entries;
3264 	local->ap->wds_oper_entries = entry;
3265 	spin_unlock_bh(&local->lock);
3266 
3267 	schedule_work(&local->ap->wds_oper_queue);
3268 }
3269 
3270 
3271 EXPORT_SYMBOL(hostap_init_data);
3272 EXPORT_SYMBOL(hostap_init_ap_proc);
3273 EXPORT_SYMBOL(hostap_free_data);
3274 EXPORT_SYMBOL(hostap_check_sta_fw_version);
3275 EXPORT_SYMBOL(hostap_handle_sta_tx_exc);
3276 #ifndef PRISM2_NO_KERNEL_IEEE80211_MGMT
3277 #endif /* PRISM2_NO_KERNEL_IEEE80211_MGMT */
3278