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[openwrt.git] / target / linux / package / ieee80211-dscape / src / ieee80211_sta.c
1 /*
2 * BSS client mode implementation
3 * Copyright 2003, Jouni Malinen <jkmaline@cc.hut.fi>
4 * Copyright 2004, Instant802 Networks, Inc.
5 * Copyright 2005, Devicescape Software, Inc.
6 *
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License version 2 as
9 * published by the Free Software Foundation.
10 */
11
12 /* TODO:
13 * BSS table: use <BSSID,SSID> as the key to support multi-SSID APs
14 * order BSS list by RSSI(?) ("quality of AP")
15 * scan result table filtering (by capability (privacy, IBSS/BSS, WPA/RSN IE,
16 * SSID)
17 */
18 #include <linux/config.h>
19 #include <linux/version.h>
20 #include <linux/if_ether.h>
21 #include <linux/skbuff.h>
22 #include <linux/netdevice.h>
23 #include <linux/if_arp.h>
24 #include <linux/wireless.h>
25 #include <linux/random.h>
26 #include <net/iw_handler.h>
27 #include <asm/types.h>
28 #include <asm/delay.h>
29
30 #include <net/ieee80211.h>
31 #include <net/ieee80211_mgmt.h>
32 #include "ieee80211_i.h"
33 #include "rate_control.h"
34 #include "hostapd_ioctl.h"
35
36 /* #define IEEE80211_IBSS_DEBUG */
37
38 #define IEEE80211_AUTH_TIMEOUT (HZ / 5)
39 #define IEEE80211_AUTH_MAX_TRIES 3
40 #define IEEE80211_ASSOC_TIMEOUT (HZ / 5)
41 #define IEEE80211_ASSOC_MAX_TRIES 3
42 #define IEEE80211_MONITORING_INTERVAL (2 * HZ)
43 #define IEEE80211_PROBE_INTERVAL (60 * HZ)
44 #define IEEE80211_RETRY_AUTH_INTERVAL (1 * HZ)
45 #define IEEE80211_SCAN_INTERVAL (2 * HZ)
46 #define IEEE80211_SCAN_INTERVAL_SLOW (15 * HZ)
47 #define IEEE80211_IBSS_JOIN_TIMEOUT (20 * HZ)
48
49 #define IEEE80211_PROBE_DELAY (HZ / 33)
50 #define IEEE80211_CHANNEL_TIME (HZ / 33)
51 #define IEEE80211_PASSIVE_CHANNEL_TIME (HZ / 5)
52 #define IEEE80211_SCAN_RESULT_EXPIRE (10 * HZ)
53 #define IEEE80211_IBSS_MERGE_INTERVAL (30 * HZ)
54 #define IEEE80211_IBSS_INACTIVITY_LIMIT (60 * HZ)
55
56 #define IEEE80211_IBSS_MAX_STA_ENTRIES 128
57
58
59 #define IEEE80211_FC(type, stype) cpu_to_le16((type << 2) | (stype << 4))
60
61 #define ERP_INFO_USE_PROTECTION BIT(1)
62
63 static void ieee80211_send_probe_req(struct net_device *dev, u8 *dst,
64 u8 *ssid, size_t ssid_len);
65 static struct ieee80211_sta_bss *
66 ieee80211_rx_bss_get(struct net_device *dev, u8 *bssid);
67 static void ieee80211_rx_bss_put(struct net_device *dev,
68 struct ieee80211_sta_bss *bss);
69 static int ieee80211_sta_find_ibss(struct net_device *dev,
70 struct ieee80211_if_sta *ifsta);
71 static int ieee80211_sta_wep_configured(struct net_device *dev);
72
73
74 /* Parsed Information Elements */
75 struct ieee802_11_elems {
76 u8 *ssid;
77 u8 ssid_len;
78 u8 *supp_rates;
79 u8 supp_rates_len;
80 u8 *fh_params;
81 u8 fh_params_len;
82 u8 *ds_params;
83 u8 ds_params_len;
84 u8 *cf_params;
85 u8 cf_params_len;
86 u8 *tim;
87 u8 tim_len;
88 u8 *ibss_params;
89 u8 ibss_params_len;
90 u8 *challenge;
91 u8 challenge_len;
92 u8 *wpa;
93 u8 wpa_len;
94 u8 *rsn;
95 u8 rsn_len;
96 u8 *erp_info;
97 u8 erp_info_len;
98 u8 *ext_supp_rates;
99 u8 ext_supp_rates_len;
100 u8 *wmm_info;
101 u8 wmm_info_len;
102 u8 *wmm_param;
103 u8 wmm_param_len;
104 };
105
106 typedef enum { ParseOK = 0, ParseUnknown = 1, ParseFailed = -1 } ParseRes;
107
108
109 static ParseRes ieee802_11_parse_elems(u8 *start, size_t len,
110 struct ieee802_11_elems *elems)
111 {
112 size_t left = len;
113 u8 *pos = start;
114 int unknown = 0;
115
116 memset(elems, 0, sizeof(*elems));
117
118 while (left >= 2) {
119 u8 id, elen;
120
121 id = *pos++;
122 elen = *pos++;
123 left -= 2;
124
125 if (elen > left) {
126 #if 0
127 if (net_ratelimit())
128 printk(KERN_DEBUG "IEEE 802.11 element parse "
129 "failed (id=%d elen=%d left=%d)\n",
130 id, elen, left);
131 #endif
132 return ParseFailed;
133 }
134
135 switch (id) {
136 case WLAN_EID_SSID:
137 elems->ssid = pos;
138 elems->ssid_len = elen;
139 break;
140 case WLAN_EID_SUPP_RATES:
141 elems->supp_rates = pos;
142 elems->supp_rates_len = elen;
143 break;
144 case WLAN_EID_FH_PARAMS:
145 elems->fh_params = pos;
146 elems->fh_params_len = elen;
147 break;
148 case WLAN_EID_DS_PARAMS:
149 elems->ds_params = pos;
150 elems->ds_params_len = elen;
151 break;
152 case WLAN_EID_CF_PARAMS:
153 elems->cf_params = pos;
154 elems->cf_params_len = elen;
155 break;
156 case WLAN_EID_TIM:
157 elems->tim = pos;
158 elems->tim_len = elen;
159 break;
160 case WLAN_EID_IBSS_PARAMS:
161 elems->ibss_params = pos;
162 elems->ibss_params_len = elen;
163 break;
164 case WLAN_EID_CHALLENGE:
165 elems->challenge = pos;
166 elems->challenge_len = elen;
167 break;
168 case WLAN_EID_WPA:
169 if (elen >= 4 && pos[0] == 0x00 && pos[1] == 0x50 &&
170 pos[2] == 0xf2) {
171 /* Microsoft OUI (00:50:F2) */
172 if (pos[3] == 1) {
173 /* OUI Type 1 - WPA IE */
174 elems->wpa = pos;
175 elems->wpa_len = elen;
176 } else if (elen >= 5 && pos[3] == 2) {
177 if (pos[4] == 0) {
178 elems->wmm_info = pos;
179 elems->wmm_info_len = elen;
180 } else if (pos[4] == 1) {
181 elems->wmm_param = pos;
182 elems->wmm_param_len = elen;
183 }
184 }
185 }
186 break;
187 case WLAN_EID_RSN:
188 elems->rsn = pos;
189 elems->rsn_len = elen;
190 break;
191 case WLAN_EID_ERP_INFO:
192 elems->erp_info = pos;
193 elems->erp_info_len = elen;
194 break;
195 case WLAN_EID_EXT_SUPP_RATES:
196 elems->ext_supp_rates = pos;
197 elems->ext_supp_rates_len = elen;
198 break;
199 default:
200 #if 0
201 printk(KERN_DEBUG "IEEE 802.11 element parse ignored "
202 "unknown element (id=%d elen=%d)\n",
203 id, elen);
204 #endif
205 unknown++;
206 break;
207 }
208
209 left -= elen;
210 pos += elen;
211 }
212
213 if (left)
214 return ParseFailed;
215
216 return unknown ? ParseUnknown : ParseOK;
217 }
218
219
220
221
222 static int ecw2cw(int ecw)
223 {
224 int cw = 1;
225 while (ecw > 0) {
226 cw <<= 1;
227 ecw--;
228 }
229 return cw - 1;
230 }
231
232
233 static void ieee80211_sta_wmm_params(struct net_device *dev,
234 struct ieee80211_if_sta *ifsta,
235 u8 *wmm_param, size_t wmm_param_len)
236 {
237 struct ieee80211_local *local = dev->priv;
238 struct ieee80211_tx_queue_params params;
239 size_t left;
240 int count;
241 u8 *pos;
242
243 if (wmm_param_len < 8 || wmm_param[5] /* version */ != 1)
244 return;
245 count = wmm_param[6] & 0x0f;
246 if (count == ifsta->wmm_last_param_set)
247 return;
248 ifsta->wmm_last_param_set = count;
249
250 pos = wmm_param + 8;
251 left = wmm_param_len - 8;
252
253 memset(&params, 0, sizeof(params));
254
255 if (local->hw->conf_tx == NULL)
256 return;
257
258 local->wmm_acm = 0;
259 for (; left >= 4; left -= 4, pos += 4) {
260 int aci = (pos[0] >> 5) & 0x03;
261 int acm = (pos[0] >> 4) & 0x01;
262 int queue;
263
264 switch (aci) {
265 case 1:
266 queue = IEEE80211_TX_QUEUE_DATA3;
267 if (acm) {
268 local->wmm_acm |= BIT(1) | BIT(2);
269 }
270 break;
271 case 2:
272 queue = IEEE80211_TX_QUEUE_DATA1;
273 if (acm) {
274 local->wmm_acm |= BIT(4) | BIT(5);
275 }
276 break;
277 case 3:
278 queue = IEEE80211_TX_QUEUE_DATA0;
279 if (acm) {
280 local->wmm_acm |= BIT(6) | BIT(7);
281 }
282 break;
283 case 0:
284 default:
285 queue = IEEE80211_TX_QUEUE_DATA2;
286 if (acm) {
287 local->wmm_acm |= BIT(0) | BIT(3);
288 }
289 break;
290 }
291
292 params.aifs = pos[0] & 0x0f;
293 params.cw_max = ecw2cw((pos[1] & 0xf0) >> 4);
294 params.cw_min = ecw2cw(pos[1] & 0x0f);
295 /* TXOP is in units of 32 usec; burst_time in 0.1 ms */
296 params.burst_time = (pos[2] | (pos[3] << 8)) * 32 / 100;
297 printk(KERN_DEBUG "%s: WMM queue=%d aci=%d acm=%d aifs=%d "
298 "cWmin=%d cWmax=%d burst=%d\n",
299 dev->name, queue, aci, acm, params.aifs, params.cw_min,
300 params.cw_max, params.burst_time);
301 /* TODO: handle ACM (block TX, fallback to next lowest allowed
302 * AC for now) */
303 if (local->hw->conf_tx(local->mdev, queue, &params)) {
304 printk(KERN_DEBUG "%s: failed to set TX queue "
305 "parameters for queue %d\n", dev->name, queue);
306 }
307 }
308 }
309
310
311 static void ieee80211_sta_send_associnfo(struct net_device *dev,
312 struct ieee80211_if_sta *ifsta)
313 {
314 char *buf;
315 size_t len;
316 int i;
317 union iwreq_data wrqu;
318
319 if (ifsta->assocreq_ies == NULL && ifsta->assocresp_ies == NULL)
320 return;
321
322 buf = kmalloc(50 + 2 * (ifsta->assocreq_ies_len +
323 ifsta->assocresp_ies_len), GFP_ATOMIC);
324 if (buf == NULL)
325 return;
326
327 len = sprintf(buf, "ASSOCINFO(");
328 if (ifsta->assocreq_ies) {
329 len += sprintf(buf + len, "ReqIEs=");
330 for (i = 0; i < ifsta->assocreq_ies_len; i++) {
331 len += sprintf(buf + len, "%02x",
332 ifsta->assocreq_ies[i]);
333 }
334 }
335 if (ifsta->assocresp_ies) {
336 if (ifsta->assocreq_ies)
337 len += sprintf(buf + len, " ");
338 len += sprintf(buf + len, "RespIEs=");
339 for (i = 0; i < ifsta->assocresp_ies_len; i++) {
340 len += sprintf(buf + len, "%02x",
341 ifsta->assocresp_ies[i]);
342 }
343 }
344 len += sprintf(buf + len, ")");
345
346 if (len > IW_CUSTOM_MAX) {
347 len = sprintf(buf, "ASSOCRESPIE=");
348 for (i = 0; i < ifsta->assocresp_ies_len; i++) {
349 len += sprintf(buf + len, "%02x",
350 ifsta->assocresp_ies[i]);
351 }
352 }
353
354 memset(&wrqu, 0, sizeof(wrqu));
355 wrqu.data.length = len;
356 wireless_send_event(dev, IWEVCUSTOM, &wrqu, buf);
357
358 kfree(buf);
359 }
360
361
362 static void ieee80211_set_associated(struct net_device *dev,
363 struct ieee80211_if_sta *ifsta, int assoc)
364 {
365 union iwreq_data wrqu;
366
367 if (ifsta->associated == assoc)
368 return;
369
370 ifsta->associated = assoc;
371
372 if (assoc) {
373 struct ieee80211_sub_if_data *sdata;
374 sdata = IEEE80211_DEV_TO_SUB_IF(dev);
375 if (sdata->type != IEEE80211_SUB_IF_TYPE_STA)
376 return;
377 ifsta->prev_bssid_set = 1;
378 memcpy(ifsta->prev_bssid, sdata->u.sta.bssid, ETH_ALEN);
379 memcpy(wrqu.ap_addr.sa_data, sdata->u.sta.bssid, ETH_ALEN);
380 ieee80211_sta_send_associnfo(dev, ifsta);
381 } else {
382 memset(wrqu.ap_addr.sa_data, 0, ETH_ALEN);
383 }
384 wrqu.ap_addr.sa_family = ARPHRD_ETHER;
385 wireless_send_event(dev, SIOCGIWAP, &wrqu, NULL);
386 ifsta->last_probe = jiffies;
387 }
388
389
390 static void ieee80211_sta_tx(struct net_device *dev, struct sk_buff *skb,
391 int encrypt, int probe_resp)
392 {
393 struct ieee80211_sub_if_data *sdata;
394 struct ieee80211_tx_packet_data *pkt_data;
395
396 sdata = IEEE80211_DEV_TO_SUB_IF(dev);
397 skb->dev = sdata->master;
398 skb->mac.raw = skb->nh.raw = skb->h.raw = skb->data;
399
400 pkt_data = (struct ieee80211_tx_packet_data *) skb->cb;
401 memset(pkt_data, 0, sizeof(struct ieee80211_tx_packet_data));
402 pkt_data->magic = IEEE80211_CB_MAGIC;
403 pkt_data->sdata = sdata;
404 pkt_data->control.do_not_encrypt = !encrypt;
405 if (probe_resp)
406 pkt_data->control.pkt_type = PKT_PROBE_RESP;
407
408 dev_queue_xmit(skb);
409 }
410
411
412 static void ieee80211_send_auth(struct net_device *dev,
413 struct ieee80211_if_sta *ifsta,
414 int transaction, u8 *extra, size_t extra_len,
415 int encrypt)
416 {
417 struct sk_buff *skb;
418 struct ieee80211_mgmt *mgmt;
419
420 skb = dev_alloc_skb(sizeof(*mgmt) + 6 + extra_len);
421 if (skb == NULL) {
422 printk(KERN_DEBUG "%s: failed to allocate buffer for auth "
423 "frame\n", dev->name);
424 return;
425 }
426
427 mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24 + 6);
428 memset(mgmt, 0, 24 + 6);
429 mgmt->frame_control = IEEE80211_FC(WLAN_FC_TYPE_MGMT,
430 WLAN_FC_STYPE_AUTH);
431 if (encrypt)
432 mgmt->frame_control |= cpu_to_le16(WLAN_FC_ISWEP);
433 memcpy(mgmt->da, ifsta->bssid, ETH_ALEN);
434 memcpy(mgmt->sa, dev->dev_addr, ETH_ALEN);
435 memcpy(mgmt->bssid, ifsta->bssid, ETH_ALEN);
436 mgmt->u.auth.auth_alg = cpu_to_le16(ifsta->auth_alg);
437 mgmt->u.auth.auth_transaction = cpu_to_le16(transaction);
438 ifsta->auth_transaction = transaction + 1;
439 mgmt->u.auth.status_code = cpu_to_le16(0);
440 if (extra)
441 memcpy(skb_put(skb, extra_len), extra, extra_len);
442
443 ieee80211_sta_tx(dev, skb, encrypt, 0);
444 }
445
446
447 static void ieee80211_authenticate(struct net_device *dev,
448 struct ieee80211_if_sta *ifsta)
449 {
450 ifsta->auth_tries++;
451 if (ifsta->auth_tries > IEEE80211_AUTH_MAX_TRIES) {
452 printk(KERN_DEBUG "%s: authentication with AP " MACSTR
453 " timed out\n",
454 dev->name, MAC2STR(ifsta->bssid));
455 return;
456 }
457
458 ifsta->state = IEEE80211_AUTHENTICATE;
459 printk(KERN_DEBUG "%s: authenticate with AP " MACSTR "\n",
460 dev->name, MAC2STR(ifsta->bssid));
461
462 ieee80211_send_auth(dev, ifsta, 1, NULL, 0, 0);
463
464 mod_timer(&ifsta->timer, jiffies + IEEE80211_AUTH_TIMEOUT);
465 }
466
467
468 static void ieee80211_send_assoc(struct net_device *dev,
469 struct ieee80211_if_sta *ifsta)
470 {
471 struct ieee80211_local *local = dev->priv;
472 struct sk_buff *skb;
473 struct ieee80211_mgmt *mgmt;
474 u8 *pos, *ies;
475 int i, len;
476 u16 capab;
477 struct ieee80211_sta_bss *bss;
478 int wmm = 0;
479
480 skb = dev_alloc_skb(sizeof(*mgmt) + 200 + ifsta->extra_ie_len +
481 ifsta->ssid_len);
482 if (skb == NULL) {
483 printk(KERN_DEBUG "%s: failed to allocate buffer for assoc "
484 "frame\n", dev->name);
485 return;
486 }
487
488 capab = ifsta->capab;
489 if (local->conf.phymode == MODE_IEEE80211G) {
490 capab |= WLAN_CAPABILITY_SHORT_SLOT_TIME |
491 WLAN_CAPABILITY_SHORT_PREAMBLE;
492 }
493 bss = ieee80211_rx_bss_get(dev, ifsta->bssid);
494 if (bss) {
495 if (bss->capability & WLAN_CAPABILITY_PRIVACY)
496 capab |= WLAN_CAPABILITY_PRIVACY;
497 if (bss->wmm_ie) {
498 wmm = 1;
499 }
500 ieee80211_rx_bss_put(dev, bss);
501 }
502
503 mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
504 memset(mgmt, 0, 24);
505 memcpy(mgmt->da, ifsta->bssid, ETH_ALEN);
506 memcpy(mgmt->sa, dev->dev_addr, ETH_ALEN);
507 memcpy(mgmt->bssid, ifsta->bssid, ETH_ALEN);
508
509 if (ifsta->prev_bssid_set) {
510 skb_put(skb, 10);
511 mgmt->frame_control = IEEE80211_FC(WLAN_FC_TYPE_MGMT,
512 WLAN_FC_STYPE_REASSOC_REQ);
513 mgmt->u.reassoc_req.capab_info = cpu_to_le16(capab);
514 mgmt->u.reassoc_req.listen_interval = cpu_to_le16(1);
515 memcpy(mgmt->u.reassoc_req.current_ap, ifsta->prev_bssid,
516 ETH_ALEN);
517 } else {
518 skb_put(skb, 4);
519 mgmt->frame_control = IEEE80211_FC(WLAN_FC_TYPE_MGMT,
520 WLAN_FC_STYPE_ASSOC_REQ);
521 mgmt->u.assoc_req.capab_info = cpu_to_le16(capab);
522 mgmt->u.assoc_req.listen_interval = cpu_to_le16(1);
523 }
524
525 /* SSID */
526 ies = pos = skb_put(skb, 2 + ifsta->ssid_len);
527 *pos++ = WLAN_EID_SSID;
528 *pos++ = ifsta->ssid_len;
529 memcpy(pos, ifsta->ssid, ifsta->ssid_len);
530
531 len = local->num_curr_rates;
532 if (len > 8)
533 len = 8;
534 pos = skb_put(skb, len + 2);
535 *pos++ = WLAN_EID_SUPP_RATES;
536 *pos++ = len;
537 for (i = 0; i < len; i++) {
538 int rate = local->curr_rates[i].rate;
539 if (local->conf.phymode == MODE_ATHEROS_TURBO)
540 rate /= 2;
541 *pos++ = (u8) (rate / 5);
542 }
543
544 if (local->num_curr_rates > len) {
545 pos = skb_put(skb, local->num_curr_rates - len + 2);
546 *pos++ = WLAN_EID_EXT_SUPP_RATES;
547 *pos++ = local->num_curr_rates - len;
548 for (i = len; i < local->num_curr_rates; i++) {
549 int rate = local->curr_rates[i].rate;
550 if (local->conf.phymode == MODE_ATHEROS_TURBO)
551 rate /= 2;
552 *pos++ = (u8) (rate / 5);
553 }
554 }
555
556 if (ifsta->extra_ie) {
557 pos = skb_put(skb, ifsta->extra_ie_len);
558 memcpy(pos, ifsta->extra_ie, ifsta->extra_ie_len);
559 }
560
561 if (wmm && ifsta->wmm_enabled) {
562 pos = skb_put(skb, 9);
563 *pos++ = WLAN_EID_VENDOR_SPECIFIC;
564 *pos++ = 7; /* len */
565 *pos++ = 0x00; /* Microsoft OUI 00:50:F2 */
566 *pos++ = 0x50;
567 *pos++ = 0xf2;
568 *pos++ = 2; /* WME */
569 *pos++ = 0; /* WME info */
570 *pos++ = 1; /* WME ver */
571 *pos++ = 0;
572 }
573
574 kfree(ifsta->assocreq_ies);
575 ifsta->assocreq_ies_len = (skb->data + skb->len) - ies;
576 ifsta->assocreq_ies = kmalloc(ifsta->assocreq_ies_len, GFP_ATOMIC);
577 if (ifsta->assocreq_ies)
578 memcpy(ifsta->assocreq_ies, ies, ifsta->assocreq_ies_len);
579
580 ieee80211_sta_tx(dev, skb, 0, 0);
581 }
582
583
584 static void ieee80211_send_deauth(struct net_device *dev,
585 struct ieee80211_if_sta *ifsta, u16 reason)
586 {
587 struct sk_buff *skb;
588 struct ieee80211_mgmt *mgmt;
589
590 skb = dev_alloc_skb(sizeof(*mgmt));
591 if (skb == NULL) {
592 printk(KERN_DEBUG "%s: failed to allocate buffer for deauth "
593 "frame\n", dev->name);
594 return;
595 }
596
597 mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
598 memset(mgmt, 0, 24);
599 memcpy(mgmt->da, ifsta->bssid, ETH_ALEN);
600 memcpy(mgmt->sa, dev->dev_addr, ETH_ALEN);
601 memcpy(mgmt->bssid, ifsta->bssid, ETH_ALEN);
602 mgmt->frame_control = IEEE80211_FC(WLAN_FC_TYPE_MGMT,
603 WLAN_FC_STYPE_DEAUTH);
604 skb_put(skb, 2);
605 mgmt->u.deauth.reason_code = cpu_to_le16(reason);
606
607 ieee80211_sta_tx(dev, skb, 0, 0);
608 }
609
610
611 static void ieee80211_send_disassoc(struct net_device *dev,
612 struct ieee80211_if_sta *ifsta, u16 reason)
613 {
614 struct sk_buff *skb;
615 struct ieee80211_mgmt *mgmt;
616
617 skb = dev_alloc_skb(sizeof(*mgmt));
618 if (skb == NULL) {
619 printk(KERN_DEBUG "%s: failed to allocate buffer for disassoc "
620 "frame\n", dev->name);
621 return;
622 }
623
624 mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
625 memset(mgmt, 0, 24);
626 memcpy(mgmt->da, ifsta->bssid, ETH_ALEN);
627 memcpy(mgmt->sa, dev->dev_addr, ETH_ALEN);
628 memcpy(mgmt->bssid, ifsta->bssid, ETH_ALEN);
629 mgmt->frame_control = IEEE80211_FC(WLAN_FC_TYPE_MGMT,
630 WLAN_FC_STYPE_DISASSOC);
631 skb_put(skb, 2);
632 mgmt->u.disassoc.reason_code = cpu_to_le16(reason);
633
634 ieee80211_sta_tx(dev, skb, 0, 0);
635 }
636
637
638 static int ieee80211_privacy_mismatch(struct net_device *dev,
639 struct ieee80211_if_sta *ifsta)
640 {
641 struct ieee80211_sta_bss *bss;
642 int res = 0;
643
644 if (ifsta == NULL || ifsta->mixed_cell ||
645 ifsta->key_mgmt != IEEE80211_KEY_MGMT_NONE)
646 return 0;
647
648 bss = ieee80211_rx_bss_get(dev, ifsta->bssid);
649 if (bss == NULL)
650 return 0;
651
652 if (ieee80211_sta_wep_configured(dev) !=
653 !!(bss->capability & WLAN_CAPABILITY_PRIVACY))
654 res = 1;
655
656 ieee80211_rx_bss_put(dev, bss);
657
658 return res;
659 }
660
661
662 static void ieee80211_associate(struct net_device *dev,
663 struct ieee80211_if_sta *ifsta)
664 {
665 ifsta->assoc_tries++;
666 if (ifsta->assoc_tries > IEEE80211_ASSOC_MAX_TRIES) {
667 printk(KERN_DEBUG "%s: association with AP " MACSTR
668 " timed out\n",
669 dev->name, MAC2STR(ifsta->bssid));
670 return;
671 }
672
673 ifsta->state = IEEE80211_ASSOCIATE;
674 printk(KERN_DEBUG "%s: associate with AP " MACSTR "\n",
675 dev->name, MAC2STR(ifsta->bssid));
676 if (ieee80211_privacy_mismatch(dev, ifsta)) {
677 printk(KERN_DEBUG "%s: mismatch in privacy configuration and "
678 "mixed-cell disabled - abort association\n", dev->name);
679 return;
680 }
681
682 ieee80211_send_assoc(dev, ifsta);
683
684 mod_timer(&ifsta->timer, jiffies + IEEE80211_ASSOC_TIMEOUT);
685 }
686
687
688 static void ieee80211_associated(struct net_device *dev,
689 struct ieee80211_if_sta *ifsta)
690 {
691 struct ieee80211_local *local = dev->priv;
692 struct sta_info *sta;
693 int disassoc;
694
695 /* TODO: start monitoring current AP signal quality and number of
696 * missed beacons. Scan other channels every now and then and search
697 * for better APs. */
698 /* TODO: remove expired BSSes */
699
700 ifsta->state = IEEE80211_ASSOCIATED;
701
702 sta = sta_info_get(local, ifsta->bssid);
703 if (sta == NULL) {
704 printk(KERN_DEBUG "%s: No STA entry for own AP " MACSTR "\n",
705 dev->name, MAC2STR(ifsta->bssid));
706 disassoc = 1;
707 } else {
708 disassoc = 0;
709 if (time_after(jiffies,
710 sta->last_rx + IEEE80211_MONITORING_INTERVAL)) {
711 if (ifsta->probereq_poll) {
712 printk(KERN_DEBUG "%s: No ProbeResp from "
713 "current AP " MACSTR " - assume out of "
714 "range\n",
715 dev->name, MAC2STR(ifsta->bssid));
716 disassoc = 1;
717 } else {
718 ieee80211_send_probe_req(dev, ifsta->bssid,
719 local->scan_ssid,
720 local->scan_ssid_len);
721 ifsta->probereq_poll = 1;
722 }
723 } else {
724 ifsta->probereq_poll = 0;
725 if (time_after(jiffies, ifsta->last_probe +
726 IEEE80211_PROBE_INTERVAL)) {
727 ifsta->last_probe = jiffies;
728 ieee80211_send_probe_req(dev, ifsta->bssid,
729 ifsta->ssid,
730 ifsta->ssid_len);
731 }
732 }
733 sta_info_release(local, sta);
734 }
735 if (disassoc) {
736 union iwreq_data wrqu;
737 memset(wrqu.ap_addr.sa_data, 0, ETH_ALEN);
738 wrqu.ap_addr.sa_family = ARPHRD_ETHER;
739 wireless_send_event(dev, SIOCGIWAP, &wrqu, NULL);
740 mod_timer(&ifsta->timer,
741 jiffies + IEEE80211_MONITORING_INTERVAL + 30 * HZ);
742 } else {
743 mod_timer(&ifsta->timer,
744 jiffies + IEEE80211_MONITORING_INTERVAL);
745 }
746 }
747
748
749 static void ieee80211_send_probe_req(struct net_device *dev, u8 *dst,
750 u8 *ssid, size_t ssid_len)
751 {
752 struct ieee80211_local *local = dev->priv;
753 struct sk_buff *skb;
754 struct ieee80211_mgmt *mgmt;
755 u8 *pos, *supp_rates, *esupp_rates = NULL;
756 int i;
757
758 skb = dev_alloc_skb(sizeof(*mgmt) + 200);
759 if (skb == NULL) {
760 printk(KERN_DEBUG "%s: failed to allocate buffer for probe "
761 "request\n", dev->name);
762 return;
763 }
764
765 mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
766 memset(mgmt, 0, 24);
767 mgmt->frame_control = IEEE80211_FC(WLAN_FC_TYPE_MGMT,
768 WLAN_FC_STYPE_PROBE_REQ);
769 memcpy(mgmt->sa, dev->dev_addr, ETH_ALEN);
770 if (dst) {
771 memcpy(mgmt->da, dst, ETH_ALEN);
772 memcpy(mgmt->bssid, dst, ETH_ALEN);
773 } else {
774 memset(mgmt->da, 0xff, ETH_ALEN);
775 memset(mgmt->bssid, 0xff, ETH_ALEN);
776 }
777 pos = skb_put(skb, 2 + ssid_len);
778 *pos++ = WLAN_EID_SSID;
779 *pos++ = ssid_len;
780 memcpy(pos, ssid, ssid_len);
781
782 supp_rates = skb_put(skb, 2);
783 supp_rates[0] = WLAN_EID_SUPP_RATES;
784 supp_rates[1] = 0;
785 for (i = 0; i < local->num_curr_rates; i++) {
786 struct ieee80211_rate *rate = &local->curr_rates[i];
787 if (!(rate->flags & IEEE80211_RATE_SUPPORTED))
788 continue;
789 if (esupp_rates) {
790 pos = skb_put(skb, 1);
791 esupp_rates[1]++;
792 } else if (supp_rates[1] == 8) {
793 esupp_rates = skb_put(skb, 3);
794 esupp_rates[0] = WLAN_EID_EXT_SUPP_RATES;
795 esupp_rates[1] = 1;
796 pos = &esupp_rates[2];
797 } else {
798 pos = skb_put(skb, 1);
799 supp_rates[1]++;
800 }
801 if (local->conf.phymode == MODE_ATHEROS_TURBO)
802 *pos = rate->rate / 10;
803 else
804 *pos = rate->rate / 5;
805 }
806
807 ieee80211_sta_tx(dev, skb, 0, 0);
808 }
809
810
811 static int ieee80211_sta_wep_configured(struct net_device *dev)
812 {
813 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
814 if (sdata == NULL || sdata->default_key == NULL ||
815 sdata->default_key->alg != ALG_WEP)
816 return 0;
817 return 1;
818 }
819
820
821 static void ieee80211_auth_completed(struct net_device *dev,
822 struct ieee80211_if_sta *ifsta)
823 {
824 printk(KERN_DEBUG "%s: authenticated\n", dev->name);
825 ifsta->authenticated = 1;
826 ieee80211_associate(dev, ifsta);
827 }
828
829
830 static void ieee80211_auth_challenge(struct net_device *dev,
831 struct ieee80211_if_sta *ifsta,
832 struct ieee80211_mgmt *mgmt,
833 size_t len,
834 struct ieee80211_rx_status *rx_status)
835 {
836 u8 *pos;
837 struct ieee802_11_elems elems;
838
839 printk(KERN_DEBUG "%s: replying to auth challenge\n", dev->name);
840 pos = mgmt->u.auth.variable;
841 if (ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), &elems)
842 == ParseFailed) {
843 printk(KERN_DEBUG "%s: failed to parse Auth(challenge)\n",
844 dev->name);
845 return;
846 }
847 if (elems.challenge == NULL) {
848 printk(KERN_DEBUG "%s: no challenge IE in shared key auth "
849 "frame\n", dev->name);
850 return;
851 }
852 ieee80211_send_auth(dev, ifsta, 3, elems.challenge - 2,
853 elems.challenge_len + 2, 1);
854 }
855
856
857 static void ieee80211_rx_mgmt_auth(struct net_device *dev,
858 struct ieee80211_if_sta *ifsta,
859 struct ieee80211_mgmt *mgmt,
860 size_t len,
861 struct ieee80211_rx_status *rx_status)
862 {
863 struct ieee80211_local *local = dev->priv;
864 u16 auth_alg, auth_transaction, status_code;
865
866 if (ifsta->state != IEEE80211_AUTHENTICATE &&
867 local->conf.mode != IW_MODE_ADHOC) {
868 printk(KERN_DEBUG "%s: authentication frame received from "
869 MACSTR ", but not in authenticate state - ignored\n",
870 dev->name, MAC2STR(mgmt->sa));
871 return;
872 }
873
874 if (len < 24 + 6) {
875 printk(KERN_DEBUG "%s: too short (%zd) authentication frame "
876 "received from " MACSTR " - ignored\n",
877 dev->name, len, MAC2STR(mgmt->sa));
878 return;
879 }
880
881 if (local->conf.mode != IW_MODE_ADHOC &&
882 memcmp(ifsta->bssid, mgmt->sa, ETH_ALEN) != 0) {
883 printk(KERN_DEBUG "%s: authentication frame received from "
884 "unknown AP (SA=" MACSTR " BSSID=" MACSTR ") - "
885 "ignored\n", dev->name, MAC2STR(mgmt->sa),
886 MAC2STR(mgmt->bssid));
887 return;
888 }
889
890 if (local->conf.mode == IW_MODE_ADHOC &&
891 memcmp(ifsta->bssid, mgmt->bssid, ETH_ALEN) != 0) {
892 printk(KERN_DEBUG "%s: authentication frame received from "
893 "unknown BSSID (SA=" MACSTR " BSSID=" MACSTR ") - "
894 "ignored\n", dev->name, MAC2STR(mgmt->sa),
895 MAC2STR(mgmt->bssid));
896 return;
897 }
898
899 auth_alg = le16_to_cpu(mgmt->u.auth.auth_alg);
900 auth_transaction = le16_to_cpu(mgmt->u.auth.auth_transaction);
901 status_code = le16_to_cpu(mgmt->u.auth.status_code);
902
903 printk(KERN_DEBUG "%s: RX authentication from " MACSTR " (alg=%d "
904 "transaction=%d status=%d)\n",
905 dev->name, MAC2STR(mgmt->sa), auth_alg,
906 auth_transaction, status_code);
907
908 if (local->conf.mode == IW_MODE_ADHOC) {
909 /* IEEE 802.11 standard does not require authentication in IBSS
910 * networks and most implementations do not seem to use it.
911 * However, try to reply to authentication attempts if someone
912 * has actually implemented this.
913 * TODO: Could implement shared key authentication. */
914 if (auth_alg != WLAN_AUTH_OPEN || auth_transaction != 1) {
915 printk(KERN_DEBUG "%s: unexpected IBSS authentication "
916 "frame (alg=%d transaction=%d)\n",
917 dev->name, auth_alg, auth_transaction);
918 return;
919 }
920 ieee80211_send_auth(dev, ifsta, 2, NULL, 0, 0);
921 }
922
923 if (auth_alg != ifsta->auth_alg ||
924 auth_transaction != ifsta->auth_transaction) {
925 printk(KERN_DEBUG "%s: unexpected authentication frame "
926 "(alg=%d transaction=%d)\n",
927 dev->name, auth_alg, auth_transaction);
928 return;
929 }
930
931 if (status_code != WLAN_STATUS_SUCCESS) {
932 printk(KERN_DEBUG "%s: AP denied authentication (auth_alg=%d "
933 "code=%d)\n", dev->name, ifsta->auth_alg, status_code);
934 if (status_code == WLAN_STATUS_NOT_SUPPORTED_AUTH_ALG) {
935 const int num_algs = 3;
936 u8 algs[num_algs];
937 int i, pos;
938 algs[0] = algs[1] = algs[2] = 0xff;
939 if (ifsta->auth_algs & IEEE80211_AUTH_ALG_OPEN)
940 algs[0] = WLAN_AUTH_OPEN;
941 if (ifsta->auth_algs & IEEE80211_AUTH_ALG_SHARED_KEY)
942 algs[1] = WLAN_AUTH_SHARED_KEY;
943 if (ifsta->auth_algs & IEEE80211_AUTH_ALG_LEAP)
944 algs[2] = WLAN_AUTH_LEAP;
945 if (ifsta->auth_alg == WLAN_AUTH_OPEN)
946 pos = 0;
947 else if (ifsta->auth_alg == WLAN_AUTH_SHARED_KEY)
948 pos = 1;
949 else
950 pos = 2;
951 for (i = 0; i < num_algs; i++) {
952 pos++;
953 if (pos >= num_algs)
954 pos = 0;
955 if (algs[pos] == ifsta->auth_alg ||
956 algs[pos] == 0xff)
957 continue;
958 if (algs[pos] == WLAN_AUTH_SHARED_KEY &&
959 !ieee80211_sta_wep_configured(dev))
960 continue;
961 ifsta->auth_alg = algs[pos];
962 printk(KERN_DEBUG "%s: set auth_alg=%d for "
963 "next try\n",
964 dev->name, ifsta->auth_alg);
965 break;
966 }
967 }
968 return;
969 }
970
971 switch (ifsta->auth_alg) {
972 case WLAN_AUTH_OPEN:
973 case WLAN_AUTH_LEAP:
974 ieee80211_auth_completed(dev, ifsta);
975 break;
976 case WLAN_AUTH_SHARED_KEY:
977 if (ifsta->auth_transaction == 4)
978 ieee80211_auth_completed(dev, ifsta);
979 else
980 ieee80211_auth_challenge(dev, ifsta, mgmt, len,
981 rx_status);
982 break;
983 }
984 }
985
986
987 static void ieee80211_rx_mgmt_deauth(struct net_device *dev,
988 struct ieee80211_if_sta *ifsta,
989 struct ieee80211_mgmt *mgmt,
990 size_t len,
991 struct ieee80211_rx_status *rx_status)
992 {
993 u16 reason_code;
994
995 if (len < 24 + 2) {
996 printk(KERN_DEBUG "%s: too short (%zd) deauthentication frame "
997 "received from " MACSTR " - ignored\n",
998 dev->name, len, MAC2STR(mgmt->sa));
999 return;
1000 }
1001
1002 if (memcmp(ifsta->bssid, mgmt->sa, ETH_ALEN) != 0) {
1003 printk(KERN_DEBUG "%s: deauthentication frame received from "
1004 "unknown AP (SA=" MACSTR " BSSID=" MACSTR ") - "
1005 "ignored\n", dev->name, MAC2STR(mgmt->sa),
1006 MAC2STR(mgmt->bssid));
1007 return;
1008 }
1009
1010 reason_code = le16_to_cpu(mgmt->u.deauth.reason_code);
1011
1012 printk(KERN_DEBUG "%s: RX deauthentication from " MACSTR
1013 " (reason=%d)\n",
1014 dev->name, MAC2STR(mgmt->sa), reason_code);
1015
1016 if (ifsta->authenticated) {
1017 printk(KERN_DEBUG "%s: deauthenticated\n", dev->name);
1018 }
1019
1020 if (ifsta->state == IEEE80211_AUTHENTICATE ||
1021 ifsta->state == IEEE80211_ASSOCIATE ||
1022 ifsta->state == IEEE80211_ASSOCIATED) {
1023 ifsta->state = IEEE80211_AUTHENTICATE;
1024 mod_timer(&ifsta->timer,
1025 jiffies + IEEE80211_RETRY_AUTH_INTERVAL);
1026 }
1027
1028 ieee80211_set_associated(dev, ifsta, 0);
1029 ifsta->authenticated = 0;
1030 }
1031
1032
1033 static void ieee80211_rx_mgmt_disassoc(struct net_device *dev,
1034 struct ieee80211_if_sta *ifsta,
1035 struct ieee80211_mgmt *mgmt,
1036 size_t len,
1037 struct ieee80211_rx_status *rx_status)
1038 {
1039 u16 reason_code;
1040
1041 if (len < 24 + 2) {
1042 printk(KERN_DEBUG "%s: too short (%zd) disassociation frame "
1043 "received from " MACSTR " - ignored\n",
1044 dev->name, len, MAC2STR(mgmt->sa));
1045 return;
1046 }
1047
1048 if (memcmp(ifsta->bssid, mgmt->sa, ETH_ALEN) != 0) {
1049 printk(KERN_DEBUG "%s: disassociation frame received from "
1050 "unknown AP (SA=" MACSTR " BSSID=" MACSTR ") - "
1051 "ignored\n", dev->name, MAC2STR(mgmt->sa),
1052 MAC2STR(mgmt->bssid));
1053 return;
1054 }
1055
1056 reason_code = le16_to_cpu(mgmt->u.disassoc.reason_code);
1057
1058 printk(KERN_DEBUG "%s: RX disassociation from " MACSTR
1059 " (reason=%d)\n",
1060 dev->name, MAC2STR(mgmt->sa), reason_code);
1061
1062 if (ifsta->associated)
1063 printk(KERN_DEBUG "%s: disassociated\n", dev->name);
1064
1065 if (ifsta->state == IEEE80211_ASSOCIATED) {
1066 ifsta->state = IEEE80211_ASSOCIATE;
1067 mod_timer(&ifsta->timer,
1068 jiffies + IEEE80211_RETRY_AUTH_INTERVAL);
1069 }
1070
1071 ieee80211_set_associated(dev, ifsta, 0);
1072 }
1073
1074
1075 static void ieee80211_rx_mgmt_assoc_resp(struct net_device *dev,
1076 struct ieee80211_if_sta *ifsta,
1077 struct ieee80211_mgmt *mgmt,
1078 size_t len,
1079 struct ieee80211_rx_status *rx_status,
1080 int reassoc)
1081 {
1082 struct ieee80211_local *local = dev->priv;
1083 struct sta_info *sta;
1084 u32 rates;
1085 u16 capab_info, status_code, aid;
1086 struct ieee802_11_elems elems;
1087 u8 *pos;
1088 int i, j;
1089
1090 /* AssocResp and ReassocResp have identical structure, so process both
1091 * of them in this function. */
1092
1093 if (ifsta->state != IEEE80211_ASSOCIATE) {
1094 printk(KERN_DEBUG "%s: association frame received from "
1095 MACSTR ", but not in associate state - ignored\n",
1096 dev->name, MAC2STR(mgmt->sa));
1097 return;
1098 }
1099
1100 if (len < 24 + 6) {
1101 printk(KERN_DEBUG "%s: too short (%zd) association frame "
1102 "received from " MACSTR " - ignored\n",
1103 dev->name, len, MAC2STR(mgmt->sa));
1104 return;
1105 }
1106
1107 if (memcmp(ifsta->bssid, mgmt->sa, ETH_ALEN) != 0) {
1108 printk(KERN_DEBUG "%s: association frame received from "
1109 "unknown AP (SA=" MACSTR " BSSID=" MACSTR ") - "
1110 "ignored\n", dev->name, MAC2STR(mgmt->sa),
1111 MAC2STR(mgmt->bssid));
1112 return;
1113 }
1114
1115 capab_info = le16_to_cpu(mgmt->u.assoc_resp.capab_info);
1116 status_code = le16_to_cpu(mgmt->u.assoc_resp.status_code);
1117 aid = le16_to_cpu(mgmt->u.assoc_resp.aid);
1118 if ((aid & (BIT(15) | BIT(14))) != (BIT(15) | BIT(14)))
1119 printk(KERN_DEBUG "%s: invalid aid value %d; bits 15:14 not "
1120 "set\n", dev->name, aid);
1121 aid &= ~(BIT(15) | BIT(14));
1122
1123 printk(KERN_DEBUG "%s: RX %sssocResp from " MACSTR " (capab=0x%x "
1124 "status=%d aid=%d)\n",
1125 dev->name, reassoc ? "Rea" : "A", MAC2STR(mgmt->sa),
1126 capab_info, status_code, aid);
1127
1128 if (status_code != WLAN_STATUS_SUCCESS) {
1129 printk(KERN_DEBUG "%s: AP denied association (code=%d)\n",
1130 dev->name, status_code);
1131 return;
1132 }
1133
1134 pos = mgmt->u.assoc_resp.variable;
1135 if (ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), &elems)
1136 == ParseFailed) {
1137 printk(KERN_DEBUG "%s: failed to parse AssocResp\n",
1138 dev->name);
1139 return;
1140 }
1141
1142 if (elems.supp_rates == NULL) {
1143 printk(KERN_DEBUG "%s: no SuppRates element in AssocResp\n",
1144 dev->name);
1145 return;
1146 }
1147
1148 printk(KERN_DEBUG "%s: associated\n", dev->name);
1149 ifsta->aid = aid;
1150 ifsta->ap_capab = capab_info;
1151
1152 kfree(ifsta->assocresp_ies);
1153 ifsta->assocresp_ies_len = len - (pos - (u8 *) mgmt);
1154 ifsta->assocresp_ies = kmalloc(ifsta->assocresp_ies_len, GFP_ATOMIC);
1155 if (ifsta->assocresp_ies)
1156 memcpy(ifsta->assocresp_ies, pos, ifsta->assocresp_ies_len);
1157
1158 ieee80211_set_associated(dev, ifsta, 1);
1159
1160 /* Add STA entry for the AP */
1161 sta = sta_info_get(local, ifsta->bssid);
1162 if (sta == NULL) {
1163 sta = sta_info_add(local, dev, ifsta->bssid);
1164 if (sta == NULL) {
1165 printk(KERN_DEBUG "%s: failed to add STA entry for the"
1166 " AP\n", dev->name);
1167 return;
1168 }
1169 }
1170
1171 sta->dev = dev;
1172 sta->flags |= WLAN_STA_AUTH | WLAN_STA_ASSOC;
1173 sta->assoc_ap = 1;
1174
1175 rates = 0;
1176 for (i = 0; i < elems.supp_rates_len; i++) {
1177 int rate = (elems.supp_rates[i] & 0x7f) * 5;
1178 if (local->conf.phymode == MODE_ATHEROS_TURBO)
1179 rate *= 2;
1180 for (j = 0; j < local->num_curr_rates; j++)
1181 if (local->curr_rates[j].rate == rate)
1182 rates |= BIT(j);
1183 }
1184 for (i = 0; i < elems.ext_supp_rates_len; i++) {
1185 int rate = (elems.ext_supp_rates[i] & 0x7f) * 5;
1186 if (local->conf.phymode == MODE_ATHEROS_TURBO)
1187 rate *= 2;
1188 for (j = 0; j < local->num_curr_rates; j++)
1189 if (local->curr_rates[j].rate == rate)
1190 rates |= BIT(j);
1191 }
1192 sta->supp_rates = rates;
1193
1194 rate_control_rate_init(local, sta);
1195
1196 if (elems.wmm_param && ifsta->wmm_enabled) {
1197 sta->flags |= WLAN_STA_WME;
1198 ieee80211_sta_wmm_params(dev, ifsta, elems.wmm_param,
1199 elems.wmm_param_len);
1200 }
1201
1202
1203 sta_info_release(local, sta);
1204
1205 ieee80211_associated(dev, ifsta);
1206 }
1207
1208
1209 /* Caller must hold local->sta_bss_lock */
1210 static void __ieee80211_rx_bss_hash_add(struct net_device *dev,
1211 struct ieee80211_sta_bss *bss)
1212 {
1213 struct ieee80211_local *local = dev->priv;
1214 bss->hnext = local->sta_bss_hash[STA_HASH(bss->bssid)];
1215 local->sta_bss_hash[STA_HASH(bss->bssid)] = bss;
1216 }
1217
1218
1219 /* Caller must hold local->sta_bss_lock */
1220 static void __ieee80211_rx_bss_hash_del(struct net_device *dev,
1221 struct ieee80211_sta_bss *bss)
1222 {
1223 struct ieee80211_local *local = dev->priv;
1224 struct ieee80211_sta_bss *b, *prev = NULL;
1225 b = local->sta_bss_hash[STA_HASH(bss->bssid)];
1226 while (b) {
1227 if (b == bss) {
1228 if (prev == NULL) {
1229 local->sta_bss_hash[STA_HASH(bss->bssid)] =
1230 bss->hnext;
1231 } else {
1232 prev->hnext = bss->hnext;
1233 }
1234 break;
1235 }
1236 prev = b;
1237 b = b->hnext;
1238 }
1239 }
1240
1241
1242 static struct ieee80211_sta_bss *
1243 ieee80211_rx_bss_add(struct net_device *dev, u8 *bssid)
1244 {
1245 struct ieee80211_local *local = dev->priv;
1246 struct ieee80211_sta_bss *bss;
1247
1248 bss = kmalloc(sizeof(*bss), GFP_ATOMIC);
1249 if (bss == NULL)
1250 return NULL;
1251 memset(bss, 0, sizeof(*bss));
1252 atomic_inc(&bss->users);
1253 atomic_inc(&bss->users);
1254 memcpy(bss->bssid, bssid, ETH_ALEN);
1255
1256 spin_lock_bh(&local->sta_bss_lock);
1257 /* TODO: order by RSSI? */
1258 list_add_tail(&bss->list, &local->sta_bss_list);
1259 __ieee80211_rx_bss_hash_add(dev, bss);
1260 spin_unlock_bh(&local->sta_bss_lock);
1261 return bss;
1262 }
1263
1264
1265 static struct ieee80211_sta_bss *
1266 ieee80211_rx_bss_get(struct net_device *dev, u8 *bssid)
1267 {
1268 struct ieee80211_local *local = dev->priv;
1269 struct ieee80211_sta_bss *bss;
1270
1271 spin_lock_bh(&local->sta_bss_lock);
1272 bss = local->sta_bss_hash[STA_HASH(bssid)];
1273 while (bss) {
1274 if (memcmp(bss->bssid, bssid, ETH_ALEN) == 0) {
1275 atomic_inc(&bss->users);
1276 break;
1277 }
1278 bss = bss->hnext;
1279 }
1280 spin_unlock_bh(&local->sta_bss_lock);
1281 return bss;
1282 }
1283
1284
1285 static void ieee80211_rx_bss_free(struct ieee80211_sta_bss *bss)
1286 {
1287 kfree(bss->wpa_ie);
1288 kfree(bss->rsn_ie);
1289 kfree(bss->wmm_ie);
1290 kfree(bss);
1291 }
1292
1293
1294 static void ieee80211_rx_bss_put(struct net_device *dev,
1295 struct ieee80211_sta_bss *bss)
1296 {
1297 struct ieee80211_local *local = dev->priv;
1298 if (!atomic_dec_and_test(&bss->users))
1299 return;
1300
1301 spin_lock_bh(&local->sta_bss_lock);
1302 __ieee80211_rx_bss_hash_del(dev, bss);
1303 list_del(&bss->list);
1304 spin_unlock_bh(&local->sta_bss_lock);
1305 ieee80211_rx_bss_free(bss);
1306 }
1307
1308
1309 void ieee80211_rx_bss_list_init(struct net_device *dev)
1310 {
1311 struct ieee80211_local *local = dev->priv;
1312 spin_lock_init(&local->sta_bss_lock);
1313 INIT_LIST_HEAD(&local->sta_bss_list);
1314 }
1315
1316
1317 void ieee80211_rx_bss_list_deinit(struct net_device *dev)
1318 {
1319 struct ieee80211_local *local = dev->priv;
1320 struct ieee80211_sta_bss *bss;
1321 struct list_head *ptr;
1322
1323 for (;;) {
1324 ptr = local->sta_bss_list.next;
1325 if (!ptr || ptr == &local->sta_bss_list)
1326 break;
1327 bss = list_entry(ptr, struct ieee80211_sta_bss, list);
1328 ieee80211_rx_bss_put(dev, bss);
1329 }
1330 }
1331
1332
1333 static void ieee80211_rx_bss_info(struct net_device *dev,
1334 struct ieee80211_mgmt *mgmt,
1335 size_t len,
1336 struct ieee80211_rx_status *rx_status,
1337 int beacon)
1338 {
1339 struct ieee80211_local *local = dev->priv;
1340 struct ieee802_11_elems elems;
1341 size_t baselen;
1342 int channel, invalid = 0, clen;
1343 struct ieee80211_sta_bss *bss;
1344 struct sta_info *sta;
1345 struct ieee80211_sub_if_data *sdata;
1346 u64 timestamp;
1347 u8 *pos;
1348
1349 if (!beacon && memcmp(mgmt->da, dev->dev_addr, ETH_ALEN))
1350 return; /* ignore ProbeResp to foreign address */
1351
1352 #if 0
1353 printk(KERN_DEBUG "%s: RX %s from " MACSTR " to " MACSTR "\n",
1354 dev->name, beacon ? "Beacon" : "Probe Response",
1355 MAC2STR(mgmt->sa), MAC2STR(mgmt->da));
1356 #endif
1357
1358 baselen = (u8 *) mgmt->u.beacon.variable - (u8 *) mgmt;
1359 if (baselen > len)
1360 return;
1361
1362 pos = mgmt->u.beacon.timestamp;
1363 timestamp = ((u64) pos[7] << 56) | ((u64) pos[6] << 48) |
1364 ((u64) pos[5] << 40) | ((u64) pos[4] << 32) |
1365 ((u64) pos[3] << 24) | ((u64) pos[2] << 16) |
1366 ((u64) pos[1] << 8) | ((u64) pos[0]);
1367
1368 if (local->conf.mode == IW_MODE_ADHOC && beacon &&
1369 memcmp(mgmt->bssid, local->bssid, ETH_ALEN) == 0) {
1370 #ifdef IEEE80211_IBSS_DEBUG
1371 static unsigned long last_tsf_debug = 0;
1372 u64 tsf;
1373 if (local->hw->get_tsf)
1374 tsf = local->hw->get_tsf(local->mdev);
1375 else
1376 tsf = -1LLU;
1377 if (time_after(jiffies, last_tsf_debug + 5 * HZ)) {
1378 printk(KERN_DEBUG "RX beacon SA=" MACSTR " BSSID="
1379 MACSTR " TSF=0x%llx BCN=0x%llx diff=%lld "
1380 "@%ld\n",
1381 MAC2STR(mgmt->sa), MAC2STR(mgmt->bssid),
1382 tsf, timestamp, tsf - timestamp, jiffies);
1383 last_tsf_debug = jiffies;
1384 }
1385 #endif /* IEEE80211_IBSS_DEBUG */
1386 }
1387
1388 if (ieee802_11_parse_elems(mgmt->u.beacon.variable, len - baselen,
1389 &elems) == ParseFailed)
1390 invalid = 1;
1391
1392 if (local->conf.mode == IW_MODE_ADHOC && elems.supp_rates &&
1393 memcmp(mgmt->bssid, local->bssid, ETH_ALEN) == 0 &&
1394 (sta = sta_info_get(local, mgmt->sa)) &&
1395 (sdata = IEEE80211_DEV_TO_SUB_IF(dev)) &&
1396 sdata->type == IEEE80211_SUB_IF_TYPE_STA) {
1397 struct ieee80211_rate *rates;
1398 size_t num_rates;
1399 u32 supp_rates, prev_rates;
1400 int i, j, oper_mode;
1401
1402 rates = local->curr_rates;
1403 num_rates = local->num_curr_rates;
1404 oper_mode = local->sta_scanning ? local->scan_oper_phymode :
1405 local->conf.phymode;
1406 for (i = 0; i < local->hw->num_modes; i++) {
1407 struct ieee80211_hw_modes *mode = &local->hw->modes[i];
1408 if (oper_mode == mode->mode) {
1409 rates = mode->rates;
1410 num_rates = mode->num_rates;
1411 break;
1412 }
1413 }
1414
1415 supp_rates = 0;
1416 for (i = 0; i < elems.supp_rates_len +
1417 elems.ext_supp_rates_len; i++) {
1418 u8 rate = 0;
1419 int own_rate;
1420 if (i < elems.supp_rates_len)
1421 rate = elems.supp_rates[i];
1422 else if (elems.ext_supp_rates)
1423 rate = elems.ext_supp_rates
1424 [i - elems.supp_rates_len];
1425 own_rate = 5 * (rate & 0x7f);
1426 if (oper_mode == MODE_ATHEROS_TURBO)
1427 own_rate *= 2;
1428 for (j = 0; j < num_rates; j++)
1429 if (rates[j].rate == own_rate)
1430 supp_rates |= BIT(j);
1431 }
1432
1433 prev_rates = sta->supp_rates;
1434 sta->supp_rates &= supp_rates;
1435 if (sta->supp_rates == 0) {
1436 /* No matching rates - this should not really happen.
1437 * Make sure that at least one rate is marked
1438 * supported to avoid issues with TX rate ctrl. */
1439
1440 sta->supp_rates = sdata->u.sta.supp_rates_bits;
1441 }
1442 if (sta->supp_rates != prev_rates) {
1443 printk(KERN_DEBUG "%s: updated supp_rates set for "
1444 MACSTR " based on beacon info (0x%x & 0x%x -> "
1445 "0x%x)\n",
1446 dev->name, MAC2STR(sta->addr), prev_rates,
1447 supp_rates, sta->supp_rates);
1448 }
1449 sta_info_release(local, sta);
1450 }
1451
1452 if (elems.ssid == NULL)
1453 return;
1454
1455 if (elems.ds_params && elems.ds_params_len == 1)
1456 channel = elems.ds_params[0];
1457 else
1458 channel = rx_status->channel;
1459
1460 bss = ieee80211_rx_bss_get(dev, mgmt->bssid);
1461 if (bss == NULL) {
1462 bss = ieee80211_rx_bss_add(dev, mgmt->bssid);
1463 if (bss == NULL)
1464 return;
1465 } else {
1466 #if 0
1467 /* TODO: order by RSSI? */
1468 spin_lock_bh(&local->sta_bss_lock);
1469 list_move_tail(&bss->list, &local->sta_bss_list);
1470 spin_unlock_bh(&local->sta_bss_lock);
1471 #endif
1472 }
1473
1474 if (bss->probe_resp && beacon) {
1475 /* Do not allow beacon to override data from Probe Response. */
1476 ieee80211_rx_bss_put(dev, bss);
1477 return;
1478 }
1479
1480 bss->beacon_int = le16_to_cpu(mgmt->u.beacon.beacon_int);
1481 bss->capability = le16_to_cpu(mgmt->u.beacon.capab_info);
1482 if (elems.ssid && elems.ssid_len <= IEEE80211_MAX_SSID_LEN) {
1483 memcpy(bss->ssid, elems.ssid, elems.ssid_len);
1484 bss->ssid_len = elems.ssid_len;
1485 }
1486
1487 bss->supp_rates_len = 0;
1488 if (elems.supp_rates) {
1489 clen = IEEE80211_MAX_SUPP_RATES - bss->supp_rates_len;
1490 if (clen > elems.supp_rates_len)
1491 clen = elems.supp_rates_len;
1492 memcpy(&bss->supp_rates[bss->supp_rates_len], elems.supp_rates,
1493 clen);
1494 bss->supp_rates_len += clen;
1495 }
1496 if (elems.ext_supp_rates) {
1497 clen = IEEE80211_MAX_SUPP_RATES - bss->supp_rates_len;
1498 if (clen > elems.ext_supp_rates_len)
1499 clen = elems.ext_supp_rates_len;
1500 memcpy(&bss->supp_rates[bss->supp_rates_len],
1501 elems.ext_supp_rates, clen);
1502 bss->supp_rates_len += clen;
1503 }
1504
1505 if (elems.wpa &&
1506 (bss->wpa_ie == NULL || bss->wpa_ie_len != elems.wpa_len ||
1507 memcmp(bss->wpa_ie, elems.wpa, elems.wpa_len))) {
1508 kfree(bss->wpa_ie);
1509 bss->wpa_ie = kmalloc(elems.wpa_len + 2, GFP_ATOMIC);
1510 if (bss->wpa_ie) {
1511 memcpy(bss->wpa_ie, elems.wpa - 2, elems.wpa_len + 2);
1512 bss->wpa_ie_len = elems.wpa_len + 2;
1513 } else
1514 bss->wpa_ie_len = 0;
1515 } else if (!elems.wpa && bss->wpa_ie) {
1516 kfree(bss->wpa_ie);
1517 bss->wpa_ie = NULL;
1518 bss->wpa_ie_len = 0;
1519 }
1520
1521 if (elems.rsn &&
1522 (bss->rsn_ie == NULL || bss->rsn_ie_len != elems.rsn_len ||
1523 memcmp(bss->rsn_ie, elems.rsn, elems.rsn_len))) {
1524 kfree(bss->rsn_ie);
1525 bss->rsn_ie = kmalloc(elems.rsn_len + 2, GFP_ATOMIC);
1526 if (bss->rsn_ie) {
1527 memcpy(bss->rsn_ie, elems.rsn - 2, elems.rsn_len + 2);
1528 bss->rsn_ie_len = elems.rsn_len + 2;
1529 } else
1530 bss->rsn_ie_len = 0;
1531 } else if (!elems.rsn && bss->rsn_ie) {
1532 kfree(bss->rsn_ie);
1533 bss->rsn_ie = NULL;
1534 bss->rsn_ie_len = 0;
1535 }
1536
1537 if (elems.wmm_param &&
1538 (bss->wmm_ie == NULL || bss->wmm_ie_len != elems.wmm_param_len ||
1539 memcmp(bss->wmm_ie, elems.wmm_param, elems.wmm_param_len))) {
1540 kfree(bss->wmm_ie);
1541 bss->wmm_ie = kmalloc(elems.wmm_param_len + 2, GFP_ATOMIC);
1542 if (bss->wmm_ie) {
1543 memcpy(bss->wmm_ie, elems.wmm_param - 2,
1544 elems.wmm_param_len + 2);
1545 bss->wmm_ie_len = elems.wmm_param_len + 2;
1546 } else
1547 bss->wmm_ie_len = 0;
1548 } else if (!elems.wmm_param && bss->wmm_ie) {
1549 kfree(bss->wmm_ie);
1550 bss->wmm_ie = NULL;
1551 bss->wmm_ie_len = 0;
1552 }
1553
1554
1555 bss->hw_mode = local->conf.phymode;
1556 bss->channel = channel;
1557 bss->freq = local->conf.freq;
1558 if (channel != local->conf.channel &&
1559 (local->conf.phymode == MODE_IEEE80211G ||
1560 local->conf.phymode == MODE_IEEE80211B) &&
1561 channel >= 1 && channel <= 14) {
1562 static const int freq_list[] = {
1563 2412, 2417, 2422, 2427, 2432, 2437, 2442,
1564 2447, 2452, 2457, 2462, 2467, 2472, 2484
1565 };
1566 /* IEEE 802.11g/b mode can receive packets from neighboring
1567 * channels, so map the channel into frequency. */
1568 bss->freq = freq_list[channel - 1];
1569 }
1570 bss->timestamp = timestamp;
1571 bss->last_update = jiffies;
1572 bss->rssi = rx_status->ssi;
1573 if (!beacon)
1574 bss->probe_resp++;
1575 ieee80211_rx_bss_put(dev, bss);
1576 }
1577
1578
1579 static void ieee80211_rx_mgmt_probe_resp(struct net_device *dev,
1580 struct ieee80211_mgmt *mgmt,
1581 size_t len,
1582 struct ieee80211_rx_status *rx_status)
1583 {
1584 ieee80211_rx_bss_info(dev, mgmt, len, rx_status, 0);
1585 }
1586
1587
1588 static void ieee80211_rx_mgmt_beacon(struct net_device *dev,
1589 struct ieee80211_mgmt *mgmt,
1590 size_t len,
1591 struct ieee80211_rx_status *rx_status)
1592 {
1593 struct ieee80211_local *local = dev->priv;
1594 struct ieee80211_sub_if_data *sdata;
1595 struct ieee80211_if_sta *ifsta;
1596 int use_protection;
1597 size_t baselen;
1598 struct ieee802_11_elems elems;
1599
1600 ieee80211_rx_bss_info(dev, mgmt, len, rx_status, 1);
1601
1602 sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1603 if (sdata->type != IEEE80211_SUB_IF_TYPE_STA)
1604 return;
1605 ifsta = &sdata->u.sta;
1606
1607 if (!ifsta->associated ||
1608 memcmp(ifsta->bssid, mgmt->bssid, ETH_ALEN) != 0)
1609 return;
1610
1611 /* Process beacon from the current BSS */
1612 baselen = (u8 *) mgmt->u.beacon.variable - (u8 *) mgmt;
1613 if (baselen > len)
1614 return;
1615
1616 if (ieee802_11_parse_elems(mgmt->u.beacon.variable, len - baselen,
1617 &elems) == ParseFailed)
1618 return;
1619
1620 use_protection = 0;
1621 if (elems.erp_info && elems.erp_info_len >= 1) {
1622 use_protection =
1623 (elems.erp_info[0] & ERP_INFO_USE_PROTECTION) != 0;
1624 }
1625
1626 if (use_protection != !!ifsta->use_protection) {
1627 if (net_ratelimit()) {
1628 printk(KERN_DEBUG "%s: CTS protection %s (BSSID="
1629 MACSTR ")\n",
1630 dev->name,
1631 use_protection ? "enabled" : "disabled",
1632 MAC2STR(ifsta->bssid));
1633 }
1634 ifsta->use_protection = use_protection ? 1 : 0;
1635 local->cts_protect_erp_frames = use_protection;
1636 }
1637
1638 if (elems.wmm_param && ifsta->wmm_enabled) {
1639 ieee80211_sta_wmm_params(dev, ifsta, elems.wmm_param,
1640 elems.wmm_param_len);
1641 }
1642 }
1643
1644
1645 static void ieee80211_rx_mgmt_probe_req(struct net_device *dev,
1646 struct ieee80211_if_sta *ifsta,
1647 struct ieee80211_mgmt *mgmt,
1648 size_t len,
1649 struct ieee80211_rx_status *rx_status)
1650 {
1651 struct ieee80211_local *local = dev->priv;
1652 int tx_last_beacon;
1653 struct sk_buff *skb;
1654 struct ieee80211_mgmt *resp;
1655 u8 *pos, *end;
1656
1657 if (local->conf.mode != IW_MODE_ADHOC ||
1658 ifsta->state != IEEE80211_IBSS_JOINED ||
1659 len < 24 + 2 || ifsta->probe_resp == NULL)
1660 return;
1661
1662 if (local->hw->tx_last_beacon)
1663 tx_last_beacon = local->hw->tx_last_beacon(local->mdev);
1664 else
1665 tx_last_beacon = 1;
1666
1667 #ifdef IEEE80211_IBSS_DEBUG
1668 printk(KERN_DEBUG "%s: RX ProbeReq SA=" MACSTR " DA=" MACSTR " BSSID="
1669 MACSTR " (tx_last_beacon=%d)\n",
1670 dev->name, MAC2STR(mgmt->sa), MAC2STR(mgmt->da),
1671 MAC2STR(mgmt->bssid), tx_last_beacon);
1672 #endif /* IEEE80211_IBSS_DEBUG */
1673
1674 if (!tx_last_beacon)
1675 return;
1676
1677 if (memcmp(mgmt->bssid, ifsta->bssid, ETH_ALEN) != 0 &&
1678 memcmp(mgmt->bssid, "\xff\xff\xff\xff\xff\xff", ETH_ALEN) != 0)
1679 return;
1680
1681 end = ((u8 *) mgmt) + len;
1682 pos = mgmt->u.probe_req.variable;
1683 if (pos[0] != WLAN_EID_SSID ||
1684 pos + 2 + pos[1] > end) {
1685 if (net_ratelimit()) {
1686 printk(KERN_DEBUG "%s: Invalid SSID IE in ProbeReq "
1687 "from " MACSTR "\n",
1688 dev->name, MAC2STR(mgmt->sa));
1689 }
1690 return;
1691 }
1692 if (pos[1] != 0 &&
1693 (pos[1] != ifsta->ssid_len ||
1694 memcmp(pos + 2, ifsta->ssid, ifsta->ssid_len) != 0)) {
1695 /* Ignore ProbeReq for foreign SSID */
1696 return;
1697 }
1698
1699 /* Reply with ProbeResp */
1700 skb = skb_copy(ifsta->probe_resp, GFP_ATOMIC);
1701 if (skb == NULL)
1702 return;
1703
1704 resp = (struct ieee80211_mgmt *) skb->data;
1705 memcpy(resp->da, mgmt->sa, ETH_ALEN);
1706 #ifdef IEEE80211_IBSS_DEBUG
1707 printk(KERN_DEBUG "%s: Sending ProbeResp to " MACSTR "\n",
1708 dev->name, MAC2STR(resp->da));
1709 #endif /* IEEE80211_IBSS_DEBUG */
1710 ieee80211_sta_tx(dev, skb, 0, 1);
1711 }
1712
1713
1714 void ieee80211_sta_rx_mgmt(struct net_device *dev, struct sk_buff *skb,
1715 struct ieee80211_rx_status *rx_status)
1716 {
1717 struct ieee80211_sub_if_data *sdata;
1718 struct ieee80211_if_sta *ifsta;
1719 struct ieee80211_mgmt *mgmt;
1720 u16 fc;
1721
1722 if (skb->len < 24)
1723 goto fail;
1724
1725 sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1726 if (sdata->type != IEEE80211_SUB_IF_TYPE_STA) {
1727 printk(KERN_DEBUG "%s: ieee80211_sta_rx_mgmt: non-STA "
1728 "interface (type=%d)\n", dev->name, sdata->type);
1729 goto fail;
1730 }
1731 ifsta = &sdata->u.sta;
1732
1733 mgmt = (struct ieee80211_mgmt *) skb->data;
1734 fc = le16_to_cpu(mgmt->frame_control);
1735
1736 switch (WLAN_FC_GET_STYPE(fc)) {
1737 case WLAN_FC_STYPE_PROBE_REQ:
1738 ieee80211_rx_mgmt_probe_req(dev, ifsta, mgmt, skb->len,
1739 rx_status);
1740 break;
1741 case WLAN_FC_STYPE_PROBE_RESP:
1742 ieee80211_rx_mgmt_probe_resp(dev, mgmt, skb->len, rx_status);
1743 break;
1744 case WLAN_FC_STYPE_BEACON:
1745 ieee80211_rx_mgmt_beacon(dev, mgmt, skb->len, rx_status);
1746 break;
1747 case WLAN_FC_STYPE_AUTH:
1748 ieee80211_rx_mgmt_auth(dev, ifsta, mgmt, skb->len, rx_status);
1749 break;
1750 case WLAN_FC_STYPE_ASSOC_RESP:
1751 ieee80211_rx_mgmt_assoc_resp(dev, ifsta, mgmt, skb->len,
1752 rx_status, 0);
1753 break;
1754 case WLAN_FC_STYPE_REASSOC_RESP:
1755 ieee80211_rx_mgmt_assoc_resp(dev, ifsta, mgmt, skb->len,
1756 rx_status, 1);
1757 break;
1758 case WLAN_FC_STYPE_DEAUTH:
1759 ieee80211_rx_mgmt_deauth(dev, ifsta, mgmt, skb->len,
1760 rx_status);
1761 break;
1762 case WLAN_FC_STYPE_DISASSOC:
1763 ieee80211_rx_mgmt_disassoc(dev, ifsta, mgmt, skb->len,
1764 rx_status);
1765 break;
1766 default:
1767 printk(KERN_DEBUG "%s: received unknown management frame - "
1768 "stype=%d\n", dev->name, WLAN_FC_GET_STYPE(fc));
1769 break;
1770 }
1771
1772 fail:
1773 dev_kfree_skb(skb);
1774 }
1775
1776
1777 void ieee80211_sta_rx_scan(struct net_device *dev, struct sk_buff *skb,
1778 struct ieee80211_rx_status *rx_status)
1779 {
1780 struct ieee80211_mgmt *mgmt;
1781 u16 fc;
1782
1783 if (skb->len < 24) {
1784 dev_kfree_skb(skb);
1785 return;
1786 }
1787
1788 mgmt = (struct ieee80211_mgmt *) skb->data;
1789 fc = le16_to_cpu(mgmt->frame_control);
1790
1791 if (WLAN_FC_GET_TYPE(fc) == WLAN_FC_TYPE_MGMT) {
1792 if (WLAN_FC_GET_STYPE(fc) == WLAN_FC_STYPE_PROBE_RESP) {
1793 ieee80211_rx_mgmt_probe_resp(dev, mgmt,
1794 skb->len, rx_status);
1795 } else if (WLAN_FC_GET_STYPE(fc) == WLAN_FC_STYPE_BEACON) {
1796 ieee80211_rx_mgmt_beacon(dev, mgmt, skb->len,
1797 rx_status);
1798 }
1799 }
1800
1801 dev_kfree_skb(skb);
1802 }
1803
1804
1805 static int ieee80211_sta_active_ibss(struct net_device *dev)
1806 {
1807 struct ieee80211_local *local = dev->priv;
1808 struct list_head *ptr;
1809 int active = 0;
1810 struct sta_info *sta;
1811
1812 spin_lock_bh(&local->sta_lock);
1813 list_for_each(ptr, &local->sta_list) {
1814 sta = list_entry(ptr, struct sta_info, list);
1815 if (sta->dev == dev &&
1816 time_after(sta->last_rx + IEEE80211_IBSS_MERGE_INTERVAL,
1817 jiffies)) {
1818 active++;
1819 break;
1820 }
1821 }
1822 spin_unlock_bh(&local->sta_lock);
1823
1824 return active;
1825 }
1826
1827
1828 static void ieee80211_sta_expire(struct net_device *dev)
1829 {
1830 struct ieee80211_local *local = dev->priv;
1831 struct list_head *ptr, *n;
1832 struct sta_info *sta;
1833
1834 spin_lock_bh(&local->sta_lock);
1835 list_for_each_safe(ptr, n, &local->sta_list) {
1836 sta = list_entry(ptr, struct sta_info, list);
1837 if (time_after(jiffies, sta->last_rx +
1838 IEEE80211_IBSS_INACTIVITY_LIMIT)) {
1839 printk(KERN_DEBUG "%s: expiring inactive STA " MACSTR
1840 "\n", dev->name, MAC2STR(sta->addr));
1841 sta_info_free(local, sta, 1);
1842 }
1843 }
1844 spin_unlock_bh(&local->sta_lock);
1845 }
1846
1847
1848 static void ieee80211_sta_merge_ibss(struct net_device *dev,
1849 struct ieee80211_if_sta *ifsta)
1850 {
1851 mod_timer(&ifsta->timer, jiffies + IEEE80211_IBSS_MERGE_INTERVAL);
1852
1853 ieee80211_sta_expire(dev);
1854 if (ieee80211_sta_active_ibss(dev))
1855 return;
1856
1857 printk(KERN_DEBUG "%s: No active IBSS STAs - trying to scan for other "
1858 "IBSS networks with same SSID (merge)\n", dev->name);
1859 ieee80211_sta_req_scan(dev, ifsta->ssid, ifsta->ssid_len);
1860 }
1861
1862
1863 void ieee80211_sta_timer(unsigned long ptr)
1864 {
1865 struct net_device *dev;
1866 struct ieee80211_sub_if_data *sdata;
1867 struct ieee80211_if_sta *ifsta;
1868
1869 dev = (struct net_device *) ptr;
1870 sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1871 if (sdata->type != IEEE80211_SUB_IF_TYPE_STA) {
1872 printk(KERN_DEBUG "%s: ieee80211_sta_timer: non-STA interface "
1873 "(type=%d)\n", dev->name, sdata->type);
1874 return;
1875 }
1876 ifsta = &sdata->u.sta;
1877
1878 switch (ifsta->state) {
1879 case IEEE80211_DISABLED:
1880 break;
1881 case IEEE80211_AUTHENTICATE:
1882 ieee80211_authenticate(dev, ifsta);
1883 break;
1884 case IEEE80211_ASSOCIATE:
1885 ieee80211_associate(dev, ifsta);
1886 break;
1887 case IEEE80211_ASSOCIATED:
1888 ieee80211_associated(dev, ifsta);
1889 break;
1890 case IEEE80211_IBSS_SEARCH:
1891 ieee80211_sta_find_ibss(dev, ifsta);
1892 break;
1893 case IEEE80211_IBSS_JOINED:
1894 ieee80211_sta_merge_ibss(dev, ifsta);
1895 break;
1896 default:
1897 printk(KERN_DEBUG "ieee80211_sta_timer: Unknown state %d\n",
1898 ifsta->state);
1899 break;
1900 }
1901
1902 if (ieee80211_privacy_mismatch(dev, ifsta)) {
1903 printk(KERN_DEBUG "%s: privacy configuration mismatch and "
1904 "mixed-cell disabled - disassociate\n", dev->name);
1905
1906 ieee80211_send_disassoc(dev, ifsta, WLAN_REASON_UNSPECIFIED);
1907 ieee80211_set_associated(dev, ifsta, 0);
1908 }
1909 }
1910
1911
1912 static void ieee80211_sta_new_auth(struct net_device *dev,
1913 struct ieee80211_if_sta *ifsta)
1914 {
1915 struct ieee80211_local *local = dev->priv;
1916
1917 if (local->conf.mode != IW_MODE_INFRA)
1918 return;
1919
1920 if (local->hw->reset_tsf) {
1921 /* Reset own TSF to allow time synchronization work. */
1922 local->hw->reset_tsf(local->mdev);
1923 }
1924
1925 ifsta->wmm_last_param_set = -1; /* allow any WMM update */
1926
1927
1928 if (ifsta->auth_algs & IEEE80211_AUTH_ALG_OPEN)
1929 ifsta->auth_alg = WLAN_AUTH_OPEN;
1930 else if (ifsta->auth_algs & IEEE80211_AUTH_ALG_SHARED_KEY)
1931 ifsta->auth_alg = WLAN_AUTH_SHARED_KEY;
1932 else if (ifsta->auth_algs & IEEE80211_AUTH_ALG_LEAP)
1933 ifsta->auth_alg = WLAN_AUTH_LEAP;
1934 else
1935 ifsta->auth_alg = WLAN_AUTH_OPEN;
1936 printk(KERN_DEBUG "%s: Initial auth_alg=%d\n", dev->name,
1937 ifsta->auth_alg);
1938 ifsta->auth_transaction = -1;
1939 ifsta->auth_tries = ifsta->assoc_tries = 0;
1940 ieee80211_authenticate(dev, ifsta);
1941 }
1942
1943
1944 static int ieee80211_ibss_allowed(struct ieee80211_local *local)
1945 {
1946 int m, c;
1947
1948 for (m = 0; m < local->hw->num_modes; m++) {
1949 struct ieee80211_hw_modes *mode = &local->hw->modes[m];
1950 if (mode->mode != local->conf.phymode)
1951 continue;
1952 for (c = 0; c < mode->num_channels; c++) {
1953 struct ieee80211_channel *chan = &mode->channels[c];
1954 if (chan->flag & IEEE80211_CHAN_W_SCAN &&
1955 chan->chan == local->conf.channel) {
1956 if (chan->flag & IEEE80211_CHAN_W_IBSS)
1957 return 1;
1958 break;
1959 }
1960 }
1961 }
1962
1963 return 0;
1964 }
1965
1966
1967 extern int ieee80211_ioctl_siwfreq(struct net_device *dev,
1968 struct iw_request_info *info,
1969 struct iw_freq *freq, char *extra);
1970
1971 static int ieee80211_sta_join_ibss(struct net_device *dev,
1972 struct ieee80211_if_sta *ifsta,
1973 struct ieee80211_sta_bss *bss)
1974 {
1975 struct ieee80211_local *local = dev->priv;
1976 struct iw_freq rq;
1977 int res, rates, i, j;
1978 struct sk_buff *skb;
1979 struct ieee80211_mgmt *mgmt;
1980 struct ieee80211_tx_control control;
1981 struct ieee80211_rate *rate;
1982 struct rate_control_extra extra;
1983 u8 *pos;
1984 struct ieee80211_sub_if_data *sdata;
1985
1986 /* Remove possible STA entries from other IBSS networks. */
1987 sta_info_flush(local, NULL);
1988
1989 if (local->hw->reset_tsf) {
1990 /* Reset own TSF to allow time synchronization work. */
1991 local->hw->reset_tsf(local->mdev);
1992 }
1993 memcpy(ifsta->bssid, bss->bssid, ETH_ALEN);
1994 memcpy(local->bssid, bss->bssid, ETH_ALEN);
1995 memcpy(local->conf.client_bssid, bss->bssid, ETH_ALEN);
1996
1997 local->conf.beacon_int = bss->beacon_int >= 10 ? bss->beacon_int : 10;
1998
1999 sdata = IEEE80211_DEV_TO_SUB_IF(dev);
2000 sdata->drop_unencrypted = bss->capability &
2001 cpu_to_le16(WLAN_CAPABILITY_PRIVACY) ? 1 : 0;
2002
2003 memset(&rq, 0, sizeof(rq));
2004 rq.m = bss->freq * 100000;
2005 rq.e = 1;
2006 res = ieee80211_ioctl_siwfreq(dev, NULL, &rq, NULL);
2007
2008 if (!ieee80211_ibss_allowed(local)) {
2009 printk(KERN_DEBUG "%s: IBSS not allowed on channel %d "
2010 "(%d MHz)\n", dev->name, local->conf.channel,
2011 local->conf.freq);
2012 return -1;
2013 }
2014
2015 /* Set beacon template based on scan results */
2016 skb = dev_alloc_skb(400);
2017 do {
2018 if (skb == NULL)
2019 break;
2020
2021 mgmt = (struct ieee80211_mgmt *)
2022 skb_put(skb, 24 + sizeof(mgmt->u.beacon));
2023 memset(mgmt, 0, 24 + sizeof(mgmt->u.beacon));
2024 mgmt->frame_control = IEEE80211_FC(WLAN_FC_TYPE_MGMT,
2025 WLAN_FC_STYPE_BEACON);
2026 memset(mgmt->da, 0xff, ETH_ALEN);
2027 memcpy(mgmt->sa, dev->dev_addr, ETH_ALEN);
2028 memcpy(mgmt->bssid, ifsta->bssid, ETH_ALEN);
2029 mgmt->u.beacon.beacon_int =
2030 cpu_to_le16(local->conf.beacon_int);
2031 mgmt->u.beacon.capab_info = cpu_to_le16(bss->capability);
2032
2033 pos = skb_put(skb, 2 + ifsta->ssid_len);
2034 *pos++ = WLAN_EID_SSID;
2035 *pos++ = ifsta->ssid_len;
2036 memcpy(pos, ifsta->ssid, ifsta->ssid_len);
2037
2038 rates = bss->supp_rates_len;
2039 if (rates > 8)
2040 rates = 8;
2041 pos = skb_put(skb, 2 + rates);
2042 *pos++ = WLAN_EID_SUPP_RATES;
2043 *pos++ = rates;
2044 memcpy(pos, bss->supp_rates, rates);
2045
2046 pos = skb_put(skb, 2 + 1);
2047 *pos++ = WLAN_EID_DS_PARAMS;
2048 *pos++ = 1;
2049 *pos++ = bss->channel;
2050
2051 pos = skb_put(skb, 2 + 2);
2052 *pos++ = WLAN_EID_IBSS_PARAMS;
2053 *pos++ = 2;
2054 /* FIX: set ATIM window based on scan results */
2055 *pos++ = 0;
2056 *pos++ = 0;
2057
2058 if (bss->supp_rates_len > 8) {
2059 rates = bss->supp_rates_len - 8;
2060 pos = skb_put(skb, 2 + rates);
2061 *pos++ = WLAN_EID_EXT_SUPP_RATES;
2062 *pos++ = rates;
2063 memcpy(pos, &bss->supp_rates[8], rates);
2064 }
2065
2066 memset(&control, 0, sizeof(control));
2067 control.pkt_type = PKT_PROBE_RESP;
2068 memset(&extra, 0, sizeof(extra));
2069 extra.endidx = local->num_curr_rates;
2070 rate = rate_control_get_rate(dev, skb, &extra);
2071 if (rate == NULL) {
2072 printk(KERN_DEBUG "%s: Failed to determine TX rate "
2073 "for IBSS beacon\n", dev->name);
2074 break;
2075 }
2076 control.tx_rate = (local->short_preamble &&
2077 (rate->flags & IEEE80211_RATE_PREAMBLE2)) ?
2078 rate->val2 : rate->val;
2079 control.antenna_sel = local->conf.antenna_sel;
2080 control.power_level = local->conf.power_level;
2081 control.no_ack = 1;
2082 control.retry_limit = 1;
2083 control.rts_cts_duration = 0;
2084
2085 ifsta->probe_resp = skb_copy(skb, GFP_ATOMIC);
2086 if (ifsta->probe_resp) {
2087 mgmt = (struct ieee80211_mgmt *)
2088 ifsta->probe_resp->data;
2089 mgmt->frame_control =
2090 IEEE80211_FC(WLAN_FC_TYPE_MGMT,
2091 WLAN_FC_STYPE_PROBE_RESP);
2092 } else {
2093 printk(KERN_DEBUG "%s: Could not allocate ProbeResp "
2094 "template for IBSS\n", dev->name);
2095 }
2096
2097 if (local->hw->beacon_update &&
2098 local->hw->beacon_update(dev, skb, &control) == 0) {
2099 printk(KERN_DEBUG "%s: Configured IBSS beacon "
2100 "template based on scan results\n", dev->name);
2101 skb = NULL;
2102 }
2103
2104 rates = 0;
2105 for (i = 0; i < bss->supp_rates_len; i++) {
2106 int rate = (bss->supp_rates[i] & 0x7f) * 5;
2107 if (local->conf.phymode == MODE_ATHEROS_TURBO)
2108 rate *= 2;
2109 for (j = 0; j < local->num_curr_rates; j++)
2110 if (local->curr_rates[j].rate == rate)
2111 rates |= BIT(j);
2112 }
2113 ifsta->supp_rates_bits = rates;
2114 } while (0);
2115
2116 if (skb) {
2117 printk(KERN_DEBUG "%s: Failed to configure IBSS beacon "
2118 "template\n", dev->name);
2119 dev_kfree_skb(skb);
2120 }
2121
2122 ifsta->state = IEEE80211_IBSS_JOINED;
2123 mod_timer(&ifsta->timer, jiffies + IEEE80211_IBSS_MERGE_INTERVAL);
2124
2125 ieee80211_rx_bss_put(dev, bss);
2126
2127 return res;
2128 }
2129
2130
2131 static int ieee80211_sta_create_ibss(struct net_device *dev,
2132 struct ieee80211_if_sta *ifsta)
2133 {
2134 struct ieee80211_local *local = dev->priv;
2135 struct ieee80211_sta_bss *bss;
2136 struct ieee80211_sub_if_data *sdata;
2137 u8 bssid[ETH_ALEN], *pos;
2138 int i;
2139
2140 #if 0
2141 /* Easier testing, use fixed BSSID. */
2142 memset(bssid, 0xfe, ETH_ALEN);
2143 #else
2144 /* Generate random, not broadcast, locally administered BSSID. Mix in
2145 * own MAC address to make sure that devices that do not have proper
2146 * random number generator get different BSSID. */
2147 get_random_bytes(bssid, ETH_ALEN);
2148 for (i = 0; i < ETH_ALEN; i++)
2149 bssid[i] ^= dev->dev_addr[i];
2150 bssid[0] &= ~0x01;
2151 bssid[0] |= 0x02;
2152 #endif
2153
2154 printk(KERN_DEBUG "%s: Creating new IBSS network, BSSID " MACSTR "\n",
2155 dev->name, MAC2STR(bssid));
2156
2157 bss = ieee80211_rx_bss_add(dev, bssid);
2158 if (bss == NULL)
2159 return -ENOMEM;
2160
2161 sdata = IEEE80211_DEV_TO_SUB_IF(dev);
2162
2163 if (local->conf.beacon_int == 0)
2164 local->conf.beacon_int = 100;
2165 bss->beacon_int = local->conf.beacon_int;
2166 bss->hw_mode = local->conf.phymode;
2167 bss->channel = local->conf.channel;
2168 bss->freq = local->conf.freq;
2169 bss->last_update = jiffies;
2170 bss->capability = cpu_to_le16(WLAN_CAPABILITY_IBSS);
2171 if (sdata->default_key) {
2172 bss->capability |= cpu_to_le16(WLAN_CAPABILITY_PRIVACY);
2173 } else
2174 sdata->drop_unencrypted = 0;
2175 bss->supp_rates_len = local->num_curr_rates;
2176 pos = bss->supp_rates;
2177 for (i = 0; i < local->num_curr_rates; i++) {
2178 int rate = local->curr_rates[i].rate;
2179 if (local->conf.phymode == MODE_ATHEROS_TURBO)
2180 rate /= 2;
2181 *pos++ = (u8) (rate / 5);
2182 }
2183
2184 return ieee80211_sta_join_ibss(dev, ifsta, bss);
2185 }
2186
2187
2188 static int ieee80211_sta_find_ibss(struct net_device *dev,
2189 struct ieee80211_if_sta *ifsta)
2190 {
2191 struct ieee80211_local *local = dev->priv;
2192 struct ieee80211_sta_bss *bss;
2193 int found = 0;
2194 u8 bssid[ETH_ALEN];
2195 struct list_head *ptr;
2196 int active_ibss;
2197
2198 if (ifsta->ssid_len == 0)
2199 return -EINVAL;
2200
2201 active_ibss = ieee80211_sta_active_ibss(dev);
2202 #ifdef IEEE80211_IBSS_DEBUG
2203 printk(KERN_DEBUG "%s: sta_find_ibss (active_ibss=%d)\n",
2204 dev->name, active_ibss);
2205 #endif /* IEEE80211_IBSS_DEBUG */
2206 spin_lock_bh(&local->sta_bss_lock);
2207 list_for_each(ptr, &local->sta_bss_list) {
2208 bss = list_entry(ptr, struct ieee80211_sta_bss, list);
2209 if (ifsta->ssid_len != bss->ssid_len ||
2210 memcmp(ifsta->ssid, bss->ssid, bss->ssid_len) != 0
2211 || !(bss->capability & WLAN_CAPABILITY_IBSS))
2212 continue;
2213 #ifdef IEEE80211_IBSS_DEBUG
2214 printk(KERN_DEBUG " bssid=" MACSTR " found\n",
2215 MAC2STR(bss->bssid));
2216 #endif /* IEEE80211_IBSS_DEBUG */
2217 memcpy(bssid, bss->bssid, ETH_ALEN);
2218 found = 1;
2219 if (active_ibss || memcmp(bssid, ifsta->bssid, ETH_ALEN) != 0)
2220 break;
2221 }
2222 spin_unlock_bh(&local->sta_bss_lock);
2223
2224 #ifdef IEEE80211_IBSS_DEBUG
2225 printk(KERN_DEBUG " sta_find_ibss: selected " MACSTR " current "
2226 MACSTR "\n", MAC2STR(bssid), MAC2STR(ifsta->bssid));
2227 #endif /* IEEE80211_IBSS_DEBUG */
2228 if (found && memcmp(ifsta->bssid, bssid, ETH_ALEN) != 0 &&
2229 (bss = ieee80211_rx_bss_get(dev, bssid))) {
2230 printk(KERN_DEBUG "%s: Selected IBSS BSSID " MACSTR
2231 " based on configured SSID\n",
2232 dev->name, MAC2STR(bssid));
2233 return ieee80211_sta_join_ibss(dev, ifsta, bss);
2234 }
2235 #ifdef IEEE80211_IBSS_DEBUG
2236 printk(KERN_DEBUG " did not try to join ibss\n");
2237 #endif /* IEEE80211_IBSS_DEBUG */
2238
2239 /* Selected IBSS not found in current scan results - try to scan */
2240 if (ifsta->state == IEEE80211_IBSS_JOINED &&
2241 !ieee80211_sta_active_ibss(dev)) {
2242 mod_timer(&ifsta->timer,
2243 jiffies + IEEE80211_IBSS_MERGE_INTERVAL);
2244 } else if (time_after(jiffies, local->last_scan_completed +
2245 IEEE80211_SCAN_INTERVAL)) {
2246 printk(KERN_DEBUG "%s: Trigger new scan to find an IBSS to "
2247 "join\n", dev->name);
2248 return ieee80211_sta_req_scan(dev, ifsta->ssid,
2249 ifsta->ssid_len);
2250 } else if (ifsta->state != IEEE80211_IBSS_JOINED) {
2251 int interval = IEEE80211_SCAN_INTERVAL;
2252
2253 if (time_after(jiffies, ifsta->ibss_join_req +
2254 IEEE80211_IBSS_JOIN_TIMEOUT)) {
2255 if (ifsta->create_ibss &&
2256 ieee80211_ibss_allowed(local))
2257 return ieee80211_sta_create_ibss(dev, ifsta);
2258 if (ifsta->create_ibss) {
2259 printk(KERN_DEBUG "%s: IBSS not allowed on the"
2260 " configured channel %d (%d MHz)\n",
2261 dev->name, local->conf.channel,
2262 local->conf.freq);
2263 }
2264
2265 /* No IBSS found - decrease scan interval and continue
2266 * scanning. */
2267 interval = IEEE80211_SCAN_INTERVAL_SLOW;
2268 }
2269
2270 ifsta->state = IEEE80211_IBSS_SEARCH;
2271 mod_timer(&ifsta->timer, jiffies + interval);
2272 return 0;
2273 }
2274
2275 return 0;
2276 }
2277
2278
2279 int ieee80211_sta_set_ssid(struct net_device *dev, char *ssid, size_t len)
2280 {
2281 struct ieee80211_sub_if_data *sdata;
2282 struct ieee80211_if_sta *ifsta;
2283 struct ieee80211_local *local = dev->priv;
2284
2285 if (len > IEEE80211_MAX_SSID_LEN)
2286 return -EINVAL;
2287
2288 /* TODO: This should always be done for IBSS, even if IEEE80211_QOS is
2289 * not defined. */
2290 if (local->hw->conf_tx) {
2291 struct ieee80211_tx_queue_params qparam;
2292 int i;
2293
2294 memset(&qparam, 0, sizeof(qparam));
2295 /* TODO: are these ok defaults for all hw_modes? */
2296 qparam.aifs = 2;
2297 qparam.cw_min =
2298 local->conf.phymode == MODE_IEEE80211B ? 31 : 15;
2299 qparam.cw_max = 1023;
2300 qparam.burst_time = 0;
2301 for (i = IEEE80211_TX_QUEUE_DATA0; i < NUM_TX_DATA_QUEUES; i++)
2302 {
2303 local->hw->conf_tx(dev, i + IEEE80211_TX_QUEUE_DATA0,
2304 &qparam);
2305 }
2306 /* IBSS uses different parameters for Beacon sending */
2307 qparam.cw_min++;
2308 qparam.cw_min *= 2;
2309 qparam.cw_min--;
2310 local->hw->conf_tx(dev, IEEE80211_TX_QUEUE_BEACON, &qparam);
2311 }
2312
2313 sdata = IEEE80211_DEV_TO_SUB_IF(dev);
2314 ifsta = &sdata->u.sta;
2315
2316 if (ifsta->ssid_len != len || memcmp(ifsta->ssid, ssid, len) != 0)
2317 ifsta->prev_bssid_set = 0;
2318 memcpy(ifsta->ssid, ssid, len);
2319 memset(ifsta->ssid + len, 0, IEEE80211_MAX_SSID_LEN - len);
2320 ifsta->ssid_len = len;
2321
2322 ifsta->ssid_set = 1;
2323 if (local->conf.mode == IW_MODE_ADHOC && !ifsta->bssid_set) {
2324 ifsta->ibss_join_req = jiffies;
2325 ifsta->state = IEEE80211_IBSS_SEARCH;
2326 return ieee80211_sta_find_ibss(dev, ifsta);
2327 }
2328
2329 if (ifsta->bssid_set && ifsta->state != IEEE80211_AUTHENTICATE)
2330 ieee80211_sta_new_auth(dev, ifsta);
2331
2332 return 0;
2333 }
2334
2335
2336 int ieee80211_sta_get_ssid(struct net_device *dev, char *ssid, size_t *len)
2337 {
2338 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
2339 struct ieee80211_if_sta *ifsta = &sdata->u.sta;
2340 memcpy(ssid, ifsta->ssid, ifsta->ssid_len);
2341 *len = ifsta->ssid_len;
2342 return 0;
2343 }
2344
2345
2346 int ieee80211_sta_set_bssid(struct net_device *dev, u8 *bssid)
2347 {
2348 struct ieee80211_local *local = dev->priv;
2349 struct ieee80211_sub_if_data *sdata;
2350 struct ieee80211_if_sta *ifsta;
2351
2352 sdata = IEEE80211_DEV_TO_SUB_IF(dev);
2353 ifsta = &sdata->u.sta;
2354
2355 memcpy(ifsta->bssid, bssid, ETH_ALEN);
2356 if (local->conf.mode == IW_MODE_ADHOC)
2357 memcpy(local->bssid, bssid, ETH_ALEN);
2358
2359 if (memcmp(bssid, "\x00\x00\x00\x00\x00\x00", ETH_ALEN) == 0)
2360 ifsta->bssid_set = 0;
2361 else
2362 ifsta->bssid_set = 1;
2363 if (ifsta->ssid_set)
2364 ieee80211_sta_new_auth(dev, ifsta);
2365
2366 return 0;
2367 }
2368
2369
2370 static void ieee80211_sta_save_oper_chan(struct net_device *dev)
2371 {
2372 struct ieee80211_local *local = dev->priv;
2373 local->scan_oper_channel = local->conf.channel;
2374 local->scan_oper_channel_val = local->conf.channel_val;
2375 local->scan_oper_power_level = local->conf.power_level;
2376 local->scan_oper_freq = local->conf.freq;
2377 local->scan_oper_phymode = local->conf.phymode;
2378 local->scan_oper_antenna_max = local->conf.antenna_max;
2379 }
2380
2381
2382 static int ieee80211_sta_restore_oper_chan(struct net_device *dev)
2383 {
2384 struct ieee80211_local *local = dev->priv;
2385 local->conf.channel = local->scan_oper_channel;
2386 local->conf.channel_val = local->scan_oper_channel_val;
2387 local->conf.power_level = local->scan_oper_power_level;
2388 local->conf.freq = local->scan_oper_freq;
2389 local->conf.phymode = local->scan_oper_phymode;
2390 local->conf.antenna_max = local->scan_oper_antenna_max;
2391 return ieee80211_hw_config(dev);
2392 }
2393
2394
2395 static int ieee80211_active_scan(struct ieee80211_local *local)
2396 {
2397 int m, c;
2398
2399 for (m = 0; m < local->hw->num_modes; m++) {
2400 struct ieee80211_hw_modes *mode = &local->hw->modes[m];
2401 if (mode->mode != local->conf.phymode)
2402 continue;
2403 for (c = 0; c < mode->num_channels; c++) {
2404 struct ieee80211_channel *chan = &mode->channels[c];
2405 if (chan->flag & IEEE80211_CHAN_W_SCAN &&
2406 chan->chan == local->conf.channel) {
2407 if (chan->flag & IEEE80211_CHAN_W_ACTIVE_SCAN)
2408 return 1;
2409 break;
2410 }
2411 }
2412 }
2413
2414 return 0;
2415 }
2416
2417
2418 static void ieee80211_sta_scan_timer(unsigned long ptr)
2419 {
2420 struct net_device *dev = (struct net_device *) ptr;
2421 struct ieee80211_local *local = dev->priv;
2422 struct ieee80211_hw_modes *mode;
2423 struct ieee80211_channel *chan;
2424 int skip;
2425 union iwreq_data wrqu;
2426
2427 if (!local->sta_scanning)
2428 return;
2429
2430 switch (local->scan_state) {
2431 case SCAN_SET_CHANNEL:
2432 mode = &local->hw->modes[local->scan_hw_mode_idx];
2433 if (local->scan_hw_mode_idx >= local->hw->num_modes ||
2434 (local->scan_hw_mode_idx + 1 == local->hw->num_modes &&
2435 local->scan_channel_idx >= mode->num_channels)) {
2436 if (ieee80211_sta_restore_oper_chan(dev)) {
2437 printk(KERN_DEBUG "%s: failed to restore "
2438 "operational channel after scan\n",
2439 dev->name);
2440 }
2441 printk(KERN_DEBUG "%s: scan completed\n", dev->name);
2442 local->sta_scanning = 0;
2443 local->last_scan_completed = jiffies;
2444 memset(&wrqu, 0, sizeof(wrqu));
2445 wireless_send_event(dev, SIOCGIWSCAN, &wrqu, NULL);
2446 if (local->conf.mode == IW_MODE_ADHOC) {
2447 struct ieee80211_sub_if_data *sdata =
2448 IEEE80211_DEV_TO_SUB_IF(dev);
2449 struct ieee80211_if_sta *ifsta = &sdata->u.sta;
2450 if (!ifsta->bssid_set ||
2451 (ifsta->state == IEEE80211_IBSS_JOINED &&
2452 !ieee80211_sta_active_ibss(dev)))
2453 ieee80211_sta_find_ibss(dev, ifsta);
2454 }
2455 return;
2456 }
2457 skip = !(local->hw_modes & (1 << mode->mode));
2458 chan = &mode->channels[local->scan_channel_idx];
2459 if (!(chan->flag & IEEE80211_CHAN_W_SCAN) ||
2460 (local->conf.mode == IW_MODE_ADHOC &&
2461 !(chan->flag & IEEE80211_CHAN_W_IBSS)) ||
2462 (local->hw_modes & (1 << MODE_IEEE80211G) &&
2463 mode->mode == MODE_IEEE80211B && local->scan_skip_11b))
2464 skip = 1;
2465
2466 if (!skip) {
2467 #if 0
2468 printk(KERN_DEBUG "%s: scan channel %d (%d MHz)\n",
2469 dev->name, chan->chan, chan->freq);
2470 #endif
2471
2472 local->conf.channel = chan->chan;
2473 local->conf.channel_val = chan->val;
2474 local->conf.power_level = chan->power_level;
2475 local->conf.freq = chan->freq;
2476 local->conf.phymode = mode->mode;
2477 local->conf.antenna_max = chan->antenna_max;
2478 if (ieee80211_hw_config(dev)) {
2479 printk(KERN_DEBUG "%s: failed to set channel "
2480 "%d (%d MHz) for scan\n", dev->name,
2481 chan->chan, chan->freq);
2482 skip = 1;
2483 }
2484 }
2485
2486 local->scan_channel_idx++;
2487 if (local->scan_channel_idx >=
2488 local->hw->modes[local->scan_hw_mode_idx].num_channels) {
2489 local->scan_hw_mode_idx++;
2490 local->scan_channel_idx = 0;
2491 }
2492
2493 if (skip) {
2494 local->scan_timer.expires = jiffies;
2495 break;
2496 }
2497
2498 local->scan_timer.expires = jiffies + IEEE80211_PROBE_DELAY;
2499 local->scan_state = SCAN_SEND_PROBE;
2500 break;
2501 case SCAN_SEND_PROBE:
2502 if (ieee80211_active_scan(local)) {
2503 ieee80211_send_probe_req(dev, NULL, local->scan_ssid,
2504 local->scan_ssid_len);
2505 local->scan_timer.expires =
2506 jiffies + IEEE80211_CHANNEL_TIME;
2507 } else {
2508 local->scan_timer.expires =
2509 jiffies + IEEE80211_PASSIVE_CHANNEL_TIME;
2510 }
2511 local->scan_state = SCAN_SET_CHANNEL;
2512 break;
2513 }
2514
2515 add_timer(&local->scan_timer);
2516 }
2517
2518
2519 int ieee80211_sta_req_scan(struct net_device *dev, u8 *ssid, size_t ssid_len)
2520 {
2521 struct ieee80211_local *local = dev->priv;
2522
2523 if (ssid_len > IEEE80211_MAX_SSID_LEN)
2524 return -EINVAL;
2525
2526 /* MLME-SCAN.request (page 118) page 144 (11.1.3.1)
2527 * BSSType: INFRASTRUCTURE, INDEPENDENT, ANY_BSS
2528 * BSSID: MACAddress
2529 * SSID
2530 * ScanType: ACTIVE, PASSIVE
2531 * ProbeDelay: delay (in microseconds) to be used prior to transmitting
2532 * a Probe frame during active scanning
2533 * ChannelList
2534 * MinChannelTime (>= ProbeDelay), in TU
2535 * MaxChannelTime: (>= MinChannelTime), in TU
2536 */
2537
2538 /* MLME-SCAN.confirm
2539 * BSSDescriptionSet
2540 * ResultCode: SUCCESS, INVALID_PARAMETERS
2541 */
2542
2543 /* TODO: if assoc, move to power save mode for the duration of the
2544 * scan */
2545
2546 if (local->sta_scanning)
2547 return -EBUSY;
2548
2549 printk(KERN_DEBUG "%s: starting scan\n", dev->name);
2550
2551 ieee80211_sta_save_oper_chan(dev);
2552
2553 local->sta_scanning = 1;
2554 /* TODO: stop TX queue? */
2555
2556 if (ssid) {
2557 local->scan_ssid_len = ssid_len;
2558 memcpy(local->scan_ssid, ssid, ssid_len);
2559 } else
2560 local->scan_ssid_len = 0;
2561 local->scan_skip_11b = 1; /* FIX: clear this is 11g is not supported */
2562 local->scan_state = SCAN_SET_CHANNEL;
2563 local->scan_hw_mode_idx = 0;
2564 local->scan_channel_idx = 0;
2565 init_timer(&local->scan_timer);
2566 local->scan_timer.data = (unsigned long) dev;
2567 local->scan_timer.function = ieee80211_sta_scan_timer;
2568 local->scan_timer.expires = jiffies + 1;
2569 add_timer(&local->scan_timer);
2570
2571 return 0;
2572 }
2573
2574
2575 static char *
2576 ieee80211_sta_scan_result(struct net_device *dev,
2577 struct ieee80211_sta_bss *bss,
2578 char *current_ev, char *end_buf)
2579 {
2580 struct ieee80211_local *local = dev->priv;
2581 struct iw_event iwe;
2582
2583 if (time_after(jiffies,
2584 bss->last_update + IEEE80211_SCAN_RESULT_EXPIRE))
2585 return current_ev;
2586
2587 if (!(local->hw_modes & (1 << bss->hw_mode)))
2588 return current_ev;
2589
2590 if (local->scan_flags & IEEE80211_SCAN_WPA_ONLY &&
2591 bss->wpa_ie == NULL && bss->rsn_ie == NULL)
2592 return current_ev;
2593
2594 if (local->scan_flags & IEEE80211_SCAN_MATCH_SSID &&
2595 (local->scan_ssid_len != bss->ssid_len ||
2596 memcmp(local->scan_ssid, bss->ssid, bss->ssid_len) != 0))
2597 return current_ev;
2598
2599 memset(&iwe, 0, sizeof(iwe));
2600 iwe.cmd = SIOCGIWAP;
2601 iwe.u.ap_addr.sa_family = ARPHRD_ETHER;
2602 memcpy(iwe.u.ap_addr.sa_data, bss->bssid, ETH_ALEN);
2603 current_ev = iwe_stream_add_event(current_ev, end_buf, &iwe,
2604 IW_EV_ADDR_LEN);
2605
2606 memset(&iwe, 0, sizeof(iwe));
2607 iwe.cmd = SIOCGIWESSID;
2608 iwe.u.data.length = bss->ssid_len;
2609 iwe.u.data.flags = 1;
2610 current_ev = iwe_stream_add_point(current_ev, end_buf, &iwe,
2611 bss->ssid);
2612
2613 if (bss->capability & (WLAN_CAPABILITY_ESS | WLAN_CAPABILITY_IBSS)) {
2614 memset(&iwe, 0, sizeof(iwe));
2615 iwe.cmd = SIOCGIWMODE;
2616 if (bss->capability & WLAN_CAPABILITY_ESS)
2617 iwe.u.mode = IW_MODE_MASTER;
2618 else
2619 iwe.u.mode = IW_MODE_ADHOC;
2620 current_ev = iwe_stream_add_event(current_ev, end_buf, &iwe,
2621 IW_EV_UINT_LEN);
2622 }
2623
2624 memset(&iwe, 0, sizeof(iwe));
2625 iwe.cmd = SIOCGIWFREQ;
2626 iwe.u.freq.m = bss->freq * 100000;
2627 iwe.u.freq.e = 1;
2628 current_ev = iwe_stream_add_event(current_ev, end_buf, &iwe,
2629 IW_EV_FREQ_LEN);
2630
2631 memset(&iwe, 0, sizeof(iwe));
2632 iwe.cmd = SIOCGIWENCODE;
2633 if (bss->capability & WLAN_CAPABILITY_PRIVACY)
2634 iwe.u.data.flags = IW_ENCODE_ENABLED | IW_ENCODE_NOKEY;
2635 else
2636 iwe.u.data.flags = IW_ENCODE_DISABLED;
2637 iwe.u.data.length = 0;
2638 current_ev = iwe_stream_add_point(current_ev, end_buf, &iwe, "");
2639
2640 if (bss && bss->wpa_ie) {
2641 char *buf, *p;
2642 int i;
2643 buf = kmalloc(30 + bss->wpa_ie_len * 2, GFP_ATOMIC);
2644 if (buf) {
2645 p = buf;
2646 p += sprintf(p, "wpa_ie=");
2647 for (i = 0; i < bss->wpa_ie_len; i++)
2648 p+= sprintf(p, "%02x", bss->wpa_ie[i]);
2649 memset(&iwe, 0, sizeof(iwe));
2650 iwe.cmd = IWEVCUSTOM;
2651 iwe.u.data.length = strlen(buf);
2652 current_ev = iwe_stream_add_point(current_ev, end_buf,
2653 &iwe, buf);
2654 kfree(buf);
2655 }
2656 }
2657
2658 if (bss && bss->rsn_ie) {
2659 char *buf, *p;
2660 int i;
2661 buf = kmalloc(30 + bss->rsn_ie_len * 2, GFP_ATOMIC);
2662 if (buf) {
2663 p = buf;
2664 p += sprintf(p, "rsn_ie=");
2665 for (i = 0; i < bss->rsn_ie_len; i++)
2666 p+= sprintf(p, "%02x", bss->rsn_ie[i]);
2667 memset(&iwe, 0, sizeof(iwe));
2668 iwe.cmd = IWEVCUSTOM;
2669 iwe.u.data.length = strlen(buf);
2670 current_ev = iwe_stream_add_point(current_ev, end_buf,
2671 &iwe, buf);
2672 kfree(buf);
2673 }
2674 }
2675
2676 if (bss) {
2677 char *buf;
2678 buf = kmalloc(30, GFP_ATOMIC);
2679 if (buf) {
2680 memset(&iwe, 0, sizeof(iwe));
2681 iwe.cmd = IWEVCUSTOM;
2682 sprintf(buf, "tsf=%016llx", bss->timestamp);
2683 iwe.u.data.length = strlen(buf);
2684 current_ev = iwe_stream_add_point(current_ev, end_buf,
2685 &iwe, buf);
2686 kfree(buf);
2687 }
2688 }
2689
2690 do {
2691 char *buf, *p;
2692 int i;
2693
2694 if (!(local->scan_flags & IEEE80211_SCAN_EXTRA_INFO))
2695 break;
2696
2697 buf = kmalloc(100, GFP_ATOMIC);
2698 if (buf == NULL)
2699 break;
2700
2701 memset(&iwe, 0, sizeof(iwe));
2702 iwe.cmd = IWEVCUSTOM;
2703 sprintf(buf, "bcn_int=%d", bss->beacon_int);
2704 iwe.u.data.length = strlen(buf);
2705 current_ev = iwe_stream_add_point(current_ev, end_buf, &iwe,
2706 buf);
2707
2708 memset(&iwe, 0, sizeof(iwe));
2709 iwe.cmd = IWEVCUSTOM;
2710 sprintf(buf, "rssi=%d", bss->rssi);
2711 iwe.u.data.length = strlen(buf);
2712 current_ev = iwe_stream_add_point(current_ev, end_buf, &iwe,
2713 buf);
2714
2715 memset(&iwe, 0, sizeof(iwe));
2716 iwe.cmd = IWEVCUSTOM;
2717 sprintf(buf, "capab=0x%04x", bss->capability);
2718 iwe.u.data.length = strlen(buf);
2719 current_ev = iwe_stream_add_point(current_ev, end_buf, &iwe,
2720 buf);
2721
2722 p = buf;
2723 p += sprintf(p, "supp_rates=");
2724 for (i = 0; i < bss->supp_rates_len; i++)
2725 p+= sprintf(p, "%02x", bss->supp_rates[i]);
2726 memset(&iwe, 0, sizeof(iwe));
2727 iwe.cmd = IWEVCUSTOM;
2728 iwe.u.data.length = strlen(buf);
2729 current_ev = iwe_stream_add_point(current_ev, end_buf, &iwe,
2730 buf);
2731
2732 kfree(buf);
2733 break;
2734 } while (0);
2735
2736 return current_ev;
2737 }
2738
2739
2740 int ieee80211_sta_scan_results(struct net_device *dev, char *buf, size_t len)
2741 {
2742 struct ieee80211_local *local = dev->priv;
2743 struct list_head *ptr;
2744 char *current_ev = buf;
2745 char *end_buf = buf + len;
2746 struct ieee80211_sta_bss *bss;
2747
2748 spin_lock_bh(&local->sta_bss_lock);
2749 list_for_each(ptr, &local->sta_bss_list) {
2750 bss = list_entry(ptr, struct ieee80211_sta_bss, list);
2751 current_ev = ieee80211_sta_scan_result(dev, bss, current_ev,
2752 end_buf);
2753 }
2754 spin_unlock_bh(&local->sta_bss_lock);
2755 return current_ev - buf;
2756 }
2757
2758
2759 int ieee80211_sta_set_extra_ie(struct net_device *dev, char *ie, size_t len)
2760 {
2761 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
2762 struct ieee80211_if_sta *ifsta = &sdata->u.sta;
2763 kfree(ifsta->extra_ie);
2764 if (len == 0) {
2765 ifsta->extra_ie = NULL;
2766 ifsta->extra_ie_len = 0;
2767 return 0;
2768 }
2769 ifsta->extra_ie = kmalloc(len, GFP_KERNEL);
2770 if (ifsta->extra_ie == NULL) {
2771 ifsta->extra_ie_len = 0;
2772 return -ENOMEM;
2773 }
2774 memcpy(ifsta->extra_ie, ie, len);
2775 ifsta->extra_ie_len = len;
2776 if (ifsta->bssid_set && ifsta->ssid_set &&
2777 ifsta->state != IEEE80211_AUTHENTICATE)
2778 ieee80211_sta_new_auth(dev, ifsta);
2779 return 0;
2780 }
2781
2782
2783 struct sta_info * ieee80211_ibss_add_sta(struct net_device *dev,
2784 struct sk_buff *skb, u8 *bssid,
2785 u8 *addr)
2786 {
2787 struct ieee80211_local *local = dev->priv;
2788 struct list_head *ptr;
2789 struct sta_info *sta;
2790 struct ieee80211_sub_if_data *sdata = NULL;
2791 struct net_device *sta_dev = NULL;
2792
2793 /* TODO: Could consider removing the least recently used entry and
2794 * allow new one to be added. */
2795 if (local->num_sta >= IEEE80211_IBSS_MAX_STA_ENTRIES) {
2796 if (net_ratelimit()) {
2797 printk(KERN_DEBUG "%s: No room for a new IBSS STA "
2798 "entry " MACSTR "\n", dev->name, MAC2STR(addr));
2799 }
2800 return NULL;
2801 }
2802
2803 spin_lock_bh(&local->sub_if_lock);
2804 list_for_each(ptr, &local->sub_if_list) {
2805 sdata = list_entry(ptr, struct ieee80211_sub_if_data, list);
2806 if (sdata->type == IEEE80211_SUB_IF_TYPE_STA &&
2807 memcmp(bssid, sdata->u.sta.bssid, ETH_ALEN) == 0) {
2808 sta_dev = sdata->dev;
2809 break;
2810 }
2811 }
2812 spin_unlock_bh(&local->sub_if_lock);
2813
2814 if (sta_dev == NULL)
2815 return NULL;
2816
2817 printk(KERN_DEBUG "%s: Adding new IBSS station " MACSTR " (dev=%s)\n",
2818 dev->name, MAC2STR(addr), sta_dev->name);
2819
2820 sta = sta_info_add(local, dev, addr);
2821 if (sta == NULL) {
2822 return NULL;
2823 }
2824
2825 sta->dev = sta_dev;
2826 sta->supp_rates = sdata->u.sta.supp_rates_bits;
2827
2828 rate_control_rate_init(local, sta);
2829
2830 return sta; /* caller will call sta_info_release() */
2831 }
2832
2833
2834 int ieee80211_sta_deauthenticate(struct net_device *dev, u16 reason)
2835 {
2836 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
2837 struct ieee80211_if_sta *ifsta = &sdata->u.sta;
2838
2839 printk(KERN_DEBUG "%s: deauthenticate(reason=%d)\n",
2840 dev->name, reason);
2841
2842 if (sdata->type != IEEE80211_SUB_IF_TYPE_STA)
2843 return -EINVAL;
2844
2845 ieee80211_send_deauth(dev, ifsta, reason);
2846 ieee80211_set_associated(dev, ifsta, 0);
2847 return 0;
2848 }
2849
2850
2851 int ieee80211_sta_disassociate(struct net_device *dev, u16 reason)
2852 {
2853 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
2854 struct ieee80211_if_sta *ifsta = &sdata->u.sta;
2855
2856 printk(KERN_DEBUG "%s: disassociate(reason=%d)\n",
2857 dev->name, reason);
2858
2859 if (sdata->type != IEEE80211_SUB_IF_TYPE_STA)
2860 return -EINVAL;
2861
2862 if (!ifsta->associated)
2863 return -1;
2864
2865 ieee80211_send_disassoc(dev, ifsta, reason);
2866 ieee80211_set_associated(dev, ifsta, 0);
2867 return 0;
2868 }
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