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 * Copyright 2006-2007 Jiri Benc <jbenc@suse.cz>
7 * Copyright 2007, Michael Wu <flamingice@sourmilk.net>
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License version 2 as
11 * published by the Free Software Foundation.
14 #include <linux/delay.h>
15 #include <linux/if_ether.h>
16 #include <linux/skbuff.h>
17 #include <linux/netdevice.h>
18 #include <linux/if_arp.h>
19 #include <linux/wireless.h>
20 #include <linux/random.h>
21 #include <linux/etherdevice.h>
22 #include <linux/rtnetlink.h>
23 #include <net/iw_handler.h>
24 #include <net/mac80211.h>
25 #include <asm/unaligned.h>
27 #include "ieee80211_i.h"
31 #define IEEE80211_ASSOC_SCANS_MAX_TRIES 2
32 #define IEEE80211_AUTH_TIMEOUT (HZ / 5)
33 #define IEEE80211_AUTH_MAX_TRIES 3
34 #define IEEE80211_ASSOC_TIMEOUT (HZ / 5)
35 #define IEEE80211_ASSOC_MAX_TRIES 3
36 #define IEEE80211_MONITORING_INTERVAL (2 * HZ)
37 #define IEEE80211_PROBE_INTERVAL (60 * HZ)
38 #define IEEE80211_RETRY_AUTH_INTERVAL (1 * HZ)
39 #define IEEE80211_SCAN_INTERVAL (2 * HZ)
40 #define IEEE80211_SCAN_INTERVAL_SLOW (15 * HZ)
41 #define IEEE80211_IBSS_JOIN_TIMEOUT (7 * HZ)
43 #define IEEE80211_IBSS_MERGE_INTERVAL (30 * HZ)
44 #define IEEE80211_IBSS_INACTIVITY_LIMIT (60 * HZ)
46 #define IEEE80211_IBSS_MAX_STA_ENTRIES 128
50 static int ecw2cw(int ecw)
52 return (1 << ecw) - 1;
55 static u8 *ieee80211_bss_get_ie(struct ieee80211_bss *bss, u8 ie)
62 end = pos + bss->ies_len;
64 while (pos + 1 < end) {
65 if (pos + 2 + pos[1] > end)
75 static int ieee80211_compatible_rates(struct ieee80211_bss *bss,
76 struct ieee80211_supported_band *sband,
82 for (i = 0; i < bss->supp_rates_len; i++) {
83 int rate = (bss->supp_rates[i] & 0x7F) * 5;
85 for (j = 0; j < sband->n_bitrates; j++)
86 if (sband->bitrates[j].bitrate == rate) {
96 /* also used by mesh code */
97 u64 ieee80211_sta_get_rates(struct ieee80211_local *local,
98 struct ieee802_11_elems *elems,
99 enum ieee80211_band band)
101 struct ieee80211_supported_band *sband;
102 struct ieee80211_rate *bitrates;
106 sband = local->hw.wiphy->bands[band];
110 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
113 bitrates = sband->bitrates;
114 num_rates = sband->n_bitrates;
116 for (i = 0; i < elems->supp_rates_len +
117 elems->ext_supp_rates_len; i++) {
120 if (i < elems->supp_rates_len)
121 rate = elems->supp_rates[i];
122 else if (elems->ext_supp_rates)
123 rate = elems->ext_supp_rates
124 [i - elems->supp_rates_len];
125 own_rate = 5 * (rate & 0x7f);
126 for (j = 0; j < num_rates; j++)
127 if (bitrates[j].bitrate == own_rate)
128 supp_rates |= BIT(j);
133 /* frame sending functions */
135 /* also used by scanning code */
136 void ieee80211_send_probe_req(struct ieee80211_sub_if_data *sdata, u8 *dst,
137 u8 *ssid, size_t ssid_len)
139 struct ieee80211_local *local = sdata->local;
140 struct ieee80211_supported_band *sband;
142 struct ieee80211_mgmt *mgmt;
143 u8 *pos, *supp_rates, *esupp_rates = NULL;
146 skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*mgmt) + 200);
148 printk(KERN_DEBUG "%s: failed to allocate buffer for probe "
149 "request\n", sdata->dev->name);
152 skb_reserve(skb, local->hw.extra_tx_headroom);
154 mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
156 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
157 IEEE80211_STYPE_PROBE_REQ);
158 memcpy(mgmt->sa, sdata->dev->dev_addr, ETH_ALEN);
160 memcpy(mgmt->da, dst, ETH_ALEN);
161 memcpy(mgmt->bssid, dst, ETH_ALEN);
163 memset(mgmt->da, 0xff, ETH_ALEN);
164 memset(mgmt->bssid, 0xff, ETH_ALEN);
166 pos = skb_put(skb, 2 + ssid_len);
167 *pos++ = WLAN_EID_SSID;
169 memcpy(pos, ssid, ssid_len);
171 supp_rates = skb_put(skb, 2);
172 supp_rates[0] = WLAN_EID_SUPP_RATES;
174 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
176 for (i = 0; i < sband->n_bitrates; i++) {
177 struct ieee80211_rate *rate = &sband->bitrates[i];
179 pos = skb_put(skb, 1);
181 } else if (supp_rates[1] == 8) {
182 esupp_rates = skb_put(skb, 3);
183 esupp_rates[0] = WLAN_EID_EXT_SUPP_RATES;
185 pos = &esupp_rates[2];
187 pos = skb_put(skb, 1);
190 *pos = rate->bitrate / 5;
193 ieee80211_tx_skb(sdata, skb, 0);
196 static void ieee80211_send_auth(struct ieee80211_sub_if_data *sdata,
197 struct ieee80211_if_sta *ifsta,
198 int transaction, u8 *extra, size_t extra_len,
201 struct ieee80211_local *local = sdata->local;
203 struct ieee80211_mgmt *mgmt;
205 skb = dev_alloc_skb(local->hw.extra_tx_headroom +
206 sizeof(*mgmt) + 6 + extra_len);
208 printk(KERN_DEBUG "%s: failed to allocate buffer for auth "
209 "frame\n", sdata->dev->name);
212 skb_reserve(skb, local->hw.extra_tx_headroom);
214 mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24 + 6);
215 memset(mgmt, 0, 24 + 6);
216 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
217 IEEE80211_STYPE_AUTH);
219 mgmt->frame_control |= cpu_to_le16(IEEE80211_FCTL_PROTECTED);
220 memcpy(mgmt->da, ifsta->bssid, ETH_ALEN);
221 memcpy(mgmt->sa, sdata->dev->dev_addr, ETH_ALEN);
222 memcpy(mgmt->bssid, ifsta->bssid, ETH_ALEN);
223 mgmt->u.auth.auth_alg = cpu_to_le16(ifsta->auth_alg);
224 mgmt->u.auth.auth_transaction = cpu_to_le16(transaction);
225 ifsta->auth_transaction = transaction + 1;
226 mgmt->u.auth.status_code = cpu_to_le16(0);
228 memcpy(skb_put(skb, extra_len), extra, extra_len);
230 ieee80211_tx_skb(sdata, skb, encrypt);
233 static void ieee80211_send_assoc(struct ieee80211_sub_if_data *sdata,
234 struct ieee80211_if_sta *ifsta)
236 struct ieee80211_local *local = sdata->local;
238 struct ieee80211_mgmt *mgmt;
239 u8 *pos, *ies, *ht_add_ie;
240 int i, len, count, rates_len, supp_rates_len;
242 struct ieee80211_bss *bss;
244 struct ieee80211_supported_band *sband;
247 skb = dev_alloc_skb(local->hw.extra_tx_headroom +
248 sizeof(*mgmt) + 200 + ifsta->extra_ie_len +
251 printk(KERN_DEBUG "%s: failed to allocate buffer for assoc "
252 "frame\n", sdata->dev->name);
255 skb_reserve(skb, local->hw.extra_tx_headroom);
257 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
259 capab = ifsta->capab;
261 if (local->hw.conf.channel->band == IEEE80211_BAND_2GHZ) {
262 if (!(local->hw.flags & IEEE80211_HW_2GHZ_SHORT_SLOT_INCAPABLE))
263 capab |= WLAN_CAPABILITY_SHORT_SLOT_TIME;
264 if (!(local->hw.flags & IEEE80211_HW_2GHZ_SHORT_PREAMBLE_INCAPABLE))
265 capab |= WLAN_CAPABILITY_SHORT_PREAMBLE;
268 bss = ieee80211_rx_bss_get(local, ifsta->bssid,
269 local->hw.conf.channel->center_freq,
270 ifsta->ssid, ifsta->ssid_len);
272 if (bss->capability & WLAN_CAPABILITY_PRIVACY)
273 capab |= WLAN_CAPABILITY_PRIVACY;
277 /* get all rates supported by the device and the AP as
278 * some APs don't like getting a superset of their rates
279 * in the association request (e.g. D-Link DAP 1353 in
281 rates_len = ieee80211_compatible_rates(bss, sband, &rates);
283 if ((bss->capability & WLAN_CAPABILITY_SPECTRUM_MGMT) &&
284 (local->hw.flags & IEEE80211_HW_SPECTRUM_MGMT))
285 capab |= WLAN_CAPABILITY_SPECTRUM_MGMT;
287 ieee80211_rx_bss_put(local, bss);
290 rates_len = sband->n_bitrates;
293 mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
295 memcpy(mgmt->da, ifsta->bssid, ETH_ALEN);
296 memcpy(mgmt->sa, sdata->dev->dev_addr, ETH_ALEN);
297 memcpy(mgmt->bssid, ifsta->bssid, ETH_ALEN);
299 if (ifsta->flags & IEEE80211_STA_PREV_BSSID_SET) {
301 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
302 IEEE80211_STYPE_REASSOC_REQ);
303 mgmt->u.reassoc_req.capab_info = cpu_to_le16(capab);
304 mgmt->u.reassoc_req.listen_interval =
305 cpu_to_le16(local->hw.conf.listen_interval);
306 memcpy(mgmt->u.reassoc_req.current_ap, ifsta->prev_bssid,
310 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
311 IEEE80211_STYPE_ASSOC_REQ);
312 mgmt->u.assoc_req.capab_info = cpu_to_le16(capab);
313 mgmt->u.reassoc_req.listen_interval =
314 cpu_to_le16(local->hw.conf.listen_interval);
318 ies = pos = skb_put(skb, 2 + ifsta->ssid_len);
319 *pos++ = WLAN_EID_SSID;
320 *pos++ = ifsta->ssid_len;
321 memcpy(pos, ifsta->ssid, ifsta->ssid_len);
323 /* add all rates which were marked to be used above */
324 supp_rates_len = rates_len;
325 if (supp_rates_len > 8)
328 len = sband->n_bitrates;
329 pos = skb_put(skb, supp_rates_len + 2);
330 *pos++ = WLAN_EID_SUPP_RATES;
331 *pos++ = supp_rates_len;
334 for (i = 0; i < sband->n_bitrates; i++) {
335 if (BIT(i) & rates) {
336 int rate = sband->bitrates[i].bitrate;
337 *pos++ = (u8) (rate / 5);
343 if (rates_len > count) {
344 pos = skb_put(skb, rates_len - count + 2);
345 *pos++ = WLAN_EID_EXT_SUPP_RATES;
346 *pos++ = rates_len - count;
348 for (i++; i < sband->n_bitrates; i++) {
349 if (BIT(i) & rates) {
350 int rate = sband->bitrates[i].bitrate;
351 *pos++ = (u8) (rate / 5);
356 if (capab & WLAN_CAPABILITY_SPECTRUM_MGMT) {
357 /* 1. power capabilities */
358 pos = skb_put(skb, 4);
359 *pos++ = WLAN_EID_PWR_CAPABILITY;
361 *pos++ = 0; /* min tx power */
362 *pos++ = local->hw.conf.channel->max_power; /* max tx power */
364 /* 2. supported channels */
365 /* TODO: get this in reg domain format */
366 pos = skb_put(skb, 2 * sband->n_channels + 2);
367 *pos++ = WLAN_EID_SUPPORTED_CHANNELS;
368 *pos++ = 2 * sband->n_channels;
369 for (i = 0; i < sband->n_channels; i++) {
370 *pos++ = ieee80211_frequency_to_channel(
371 sband->channels[i].center_freq);
372 *pos++ = 1; /* one channel in the subband*/
376 if (ifsta->extra_ie) {
377 pos = skb_put(skb, ifsta->extra_ie_len);
378 memcpy(pos, ifsta->extra_ie, ifsta->extra_ie_len);
381 if (wmm && (ifsta->flags & IEEE80211_STA_WMM_ENABLED)) {
382 pos = skb_put(skb, 9);
383 *pos++ = WLAN_EID_VENDOR_SPECIFIC;
384 *pos++ = 7; /* len */
385 *pos++ = 0x00; /* Microsoft OUI 00:50:F2 */
388 *pos++ = 2; /* WME */
389 *pos++ = 0; /* WME info */
390 *pos++ = 1; /* WME ver */
394 /* wmm support is a must to HT */
395 if (wmm && (ifsta->flags & IEEE80211_STA_WMM_ENABLED) &&
396 sband->ht_info.ht_supported &&
397 (ht_add_ie = ieee80211_bss_get_ie(bss, WLAN_EID_HT_EXTRA_INFO))) {
398 struct ieee80211_ht_addt_info *ht_add_info =
399 (struct ieee80211_ht_addt_info *)ht_add_ie;
400 u16 cap = sband->ht_info.cap;
402 u32 flags = local->hw.conf.channel->flags;
404 switch (ht_add_info->ht_param & IEEE80211_HT_IE_CHA_SEC_OFFSET) {
405 case IEEE80211_HT_IE_CHA_SEC_ABOVE:
406 if (flags & IEEE80211_CHAN_NO_FAT_ABOVE) {
407 cap &= ~IEEE80211_HT_CAP_SUP_WIDTH;
408 cap &= ~IEEE80211_HT_CAP_SGI_40;
411 case IEEE80211_HT_IE_CHA_SEC_BELOW:
412 if (flags & IEEE80211_CHAN_NO_FAT_BELOW) {
413 cap &= ~IEEE80211_HT_CAP_SUP_WIDTH;
414 cap &= ~IEEE80211_HT_CAP_SGI_40;
419 tmp = cpu_to_le16(cap);
420 pos = skb_put(skb, sizeof(struct ieee80211_ht_cap)+2);
421 *pos++ = WLAN_EID_HT_CAPABILITY;
422 *pos++ = sizeof(struct ieee80211_ht_cap);
423 memset(pos, 0, sizeof(struct ieee80211_ht_cap));
424 memcpy(pos, &tmp, sizeof(u16));
426 /* TODO: needs a define here for << 2 */
427 *pos++ = sband->ht_info.ampdu_factor |
428 (sband->ht_info.ampdu_density << 2);
429 memcpy(pos, sband->ht_info.supp_mcs_set, 16);
432 kfree(ifsta->assocreq_ies);
433 ifsta->assocreq_ies_len = (skb->data + skb->len) - ies;
434 ifsta->assocreq_ies = kmalloc(ifsta->assocreq_ies_len, GFP_KERNEL);
435 if (ifsta->assocreq_ies)
436 memcpy(ifsta->assocreq_ies, ies, ifsta->assocreq_ies_len);
438 ieee80211_tx_skb(sdata, skb, 0);
442 static void ieee80211_send_deauth_disassoc(struct ieee80211_sub_if_data *sdata,
443 u16 stype, u16 reason)
445 struct ieee80211_local *local = sdata->local;
446 struct ieee80211_if_sta *ifsta = &sdata->u.sta;
448 struct ieee80211_mgmt *mgmt;
450 skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*mgmt));
452 printk(KERN_DEBUG "%s: failed to allocate buffer for "
453 "deauth/disassoc frame\n", sdata->dev->name);
456 skb_reserve(skb, local->hw.extra_tx_headroom);
458 mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
460 memcpy(mgmt->da, ifsta->bssid, ETH_ALEN);
461 memcpy(mgmt->sa, sdata->dev->dev_addr, ETH_ALEN);
462 memcpy(mgmt->bssid, ifsta->bssid, ETH_ALEN);
463 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | stype);
465 /* u.deauth.reason_code == u.disassoc.reason_code */
466 mgmt->u.deauth.reason_code = cpu_to_le16(reason);
468 ieee80211_tx_skb(sdata, skb, 0);
472 static void ieee80211_sta_def_wmm_params(struct ieee80211_sub_if_data *sdata,
473 struct ieee80211_bss *bss)
475 struct ieee80211_local *local = sdata->local;
476 int i, have_higher_than_11mbit = 0;
478 /* cf. IEEE 802.11 9.2.12 */
479 for (i = 0; i < bss->supp_rates_len; i++)
480 if ((bss->supp_rates[i] & 0x7f) * 5 > 110)
481 have_higher_than_11mbit = 1;
483 if (local->hw.conf.channel->band == IEEE80211_BAND_2GHZ &&
484 have_higher_than_11mbit)
485 sdata->flags |= IEEE80211_SDATA_OPERATING_GMODE;
487 sdata->flags &= ~IEEE80211_SDATA_OPERATING_GMODE;
489 ieee80211_set_wmm_default(sdata);
492 static void ieee80211_sta_wmm_params(struct ieee80211_local *local,
493 struct ieee80211_if_sta *ifsta,
494 u8 *wmm_param, size_t wmm_param_len)
496 struct ieee80211_tx_queue_params params;
501 if (!(ifsta->flags & IEEE80211_STA_WMM_ENABLED))
507 if (wmm_param_len < 8 || wmm_param[5] /* version */ != 1)
509 count = wmm_param[6] & 0x0f;
510 if (count == ifsta->wmm_last_param_set)
512 ifsta->wmm_last_param_set = count;
515 left = wmm_param_len - 8;
517 memset(¶ms, 0, sizeof(params));
519 if (!local->ops->conf_tx)
523 for (; left >= 4; left -= 4, pos += 4) {
524 int aci = (pos[0] >> 5) & 0x03;
525 int acm = (pos[0] >> 4) & 0x01;
532 local->wmm_acm |= BIT(0) | BIT(3);
537 local->wmm_acm |= BIT(4) | BIT(5);
542 local->wmm_acm |= BIT(6) | BIT(7);
548 local->wmm_acm |= BIT(1) | BIT(2);
552 params.aifs = pos[0] & 0x0f;
553 params.cw_max = ecw2cw((pos[1] & 0xf0) >> 4);
554 params.cw_min = ecw2cw(pos[1] & 0x0f);
555 params.txop = get_unaligned_le16(pos + 2);
556 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
557 printk(KERN_DEBUG "%s: WMM queue=%d aci=%d acm=%d aifs=%d "
558 "cWmin=%d cWmax=%d txop=%d\n",
559 local->mdev->name, queue, aci, acm, params.aifs, params.cw_min,
560 params.cw_max, params.txop);
562 /* TODO: handle ACM (block TX, fallback to next lowest allowed
564 if (local->ops->conf_tx(local_to_hw(local), queue, ¶ms)) {
565 printk(KERN_DEBUG "%s: failed to set TX queue "
566 "parameters for queue %d\n", local->mdev->name, queue);
571 static u32 ieee80211_handle_protect_preamb(struct ieee80211_sub_if_data *sdata,
573 bool use_short_preamble)
575 struct ieee80211_bss_conf *bss_conf = &sdata->bss_conf;
576 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
577 struct ieee80211_if_sta *ifsta = &sdata->u.sta;
578 DECLARE_MAC_BUF(mac);
582 if (use_protection != bss_conf->use_cts_prot) {
583 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
584 if (net_ratelimit()) {
585 printk(KERN_DEBUG "%s: CTS protection %s (BSSID="
588 use_protection ? "enabled" : "disabled",
589 print_mac(mac, ifsta->bssid));
592 bss_conf->use_cts_prot = use_protection;
593 changed |= BSS_CHANGED_ERP_CTS_PROT;
596 if (use_short_preamble != bss_conf->use_short_preamble) {
597 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
598 if (net_ratelimit()) {
599 printk(KERN_DEBUG "%s: switched to %s barker preamble"
602 use_short_preamble ? "short" : "long",
603 print_mac(mac, ifsta->bssid));
606 bss_conf->use_short_preamble = use_short_preamble;
607 changed |= BSS_CHANGED_ERP_PREAMBLE;
613 static u32 ieee80211_handle_erp_ie(struct ieee80211_sub_if_data *sdata,
616 bool use_protection = (erp_value & WLAN_ERP_USE_PROTECTION) != 0;
617 bool use_short_preamble = (erp_value & WLAN_ERP_BARKER_PREAMBLE) == 0;
619 return ieee80211_handle_protect_preamb(sdata,
620 use_protection, use_short_preamble);
623 static u32 ieee80211_handle_bss_capability(struct ieee80211_sub_if_data *sdata,
624 struct ieee80211_bss *bss)
628 if (bss->has_erp_value)
629 changed |= ieee80211_handle_erp_ie(sdata, bss->erp_value);
631 u16 capab = bss->capability;
632 changed |= ieee80211_handle_protect_preamb(sdata, false,
633 (capab & WLAN_CAPABILITY_SHORT_PREAMBLE) != 0);
639 static void ieee80211_sta_send_apinfo(struct ieee80211_sub_if_data *sdata,
640 struct ieee80211_if_sta *ifsta)
642 union iwreq_data wrqu;
643 memset(&wrqu, 0, sizeof(wrqu));
644 if (ifsta->flags & IEEE80211_STA_ASSOCIATED)
645 memcpy(wrqu.ap_addr.sa_data, sdata->u.sta.bssid, ETH_ALEN);
646 wrqu.ap_addr.sa_family = ARPHRD_ETHER;
647 wireless_send_event(sdata->dev, SIOCGIWAP, &wrqu, NULL);
650 static void ieee80211_sta_send_associnfo(struct ieee80211_sub_if_data *sdata,
651 struct ieee80211_if_sta *ifsta)
653 union iwreq_data wrqu;
655 if (ifsta->assocreq_ies) {
656 memset(&wrqu, 0, sizeof(wrqu));
657 wrqu.data.length = ifsta->assocreq_ies_len;
658 wireless_send_event(sdata->dev, IWEVASSOCREQIE, &wrqu,
659 ifsta->assocreq_ies);
661 if (ifsta->assocresp_ies) {
662 memset(&wrqu, 0, sizeof(wrqu));
663 wrqu.data.length = ifsta->assocresp_ies_len;
664 wireless_send_event(sdata->dev, IWEVASSOCRESPIE, &wrqu,
665 ifsta->assocresp_ies);
670 static void ieee80211_set_associated(struct ieee80211_sub_if_data *sdata,
671 struct ieee80211_if_sta *ifsta)
673 struct ieee80211_local *local = sdata->local;
674 struct ieee80211_conf *conf = &local_to_hw(local)->conf;
675 u32 changed = BSS_CHANGED_ASSOC;
677 struct ieee80211_bss *bss;
679 ifsta->flags |= IEEE80211_STA_ASSOCIATED;
681 if (sdata->vif.type != IEEE80211_IF_TYPE_STA)
684 bss = ieee80211_rx_bss_get(local, ifsta->bssid,
685 conf->channel->center_freq,
686 ifsta->ssid, ifsta->ssid_len);
688 /* set timing information */
689 sdata->bss_conf.beacon_int = bss->beacon_int;
690 sdata->bss_conf.timestamp = bss->timestamp;
691 sdata->bss_conf.dtim_period = bss->dtim_period;
693 changed |= ieee80211_handle_bss_capability(sdata, bss);
695 ieee80211_rx_bss_put(local, bss);
698 if (conf->flags & IEEE80211_CONF_SUPPORT_HT_MODE) {
699 changed |= BSS_CHANGED_HT;
700 sdata->bss_conf.assoc_ht = 1;
701 sdata->bss_conf.ht_conf = &conf->ht_conf;
702 sdata->bss_conf.ht_bss_conf = &conf->ht_bss_conf;
705 ifsta->flags |= IEEE80211_STA_PREV_BSSID_SET;
706 memcpy(ifsta->prev_bssid, sdata->u.sta.bssid, ETH_ALEN);
707 ieee80211_sta_send_associnfo(sdata, ifsta);
709 ifsta->last_probe = jiffies;
710 ieee80211_led_assoc(local, 1);
712 sdata->bss_conf.assoc = 1;
713 ieee80211_bss_info_change_notify(sdata, changed);
715 netif_tx_start_all_queues(sdata->dev);
716 netif_carrier_on(sdata->dev);
718 ieee80211_sta_send_apinfo(sdata, ifsta);
721 static void ieee80211_direct_probe(struct ieee80211_sub_if_data *sdata,
722 struct ieee80211_if_sta *ifsta)
724 DECLARE_MAC_BUF(mac);
726 ifsta->direct_probe_tries++;
727 if (ifsta->direct_probe_tries > IEEE80211_AUTH_MAX_TRIES) {
728 printk(KERN_DEBUG "%s: direct probe to AP %s timed out\n",
729 sdata->dev->name, print_mac(mac, ifsta->bssid));
730 ifsta->state = IEEE80211_STA_MLME_DISABLED;
734 printk(KERN_DEBUG "%s: direct probe to AP %s try %d\n",
735 sdata->dev->name, print_mac(mac, ifsta->bssid),
736 ifsta->direct_probe_tries);
738 ifsta->state = IEEE80211_STA_MLME_DIRECT_PROBE;
740 set_bit(IEEE80211_STA_REQ_DIRECT_PROBE, &ifsta->request);
742 /* Direct probe is sent to broadcast address as some APs
743 * will not answer to direct packet in unassociated state.
745 ieee80211_send_probe_req(sdata, NULL,
746 ifsta->ssid, ifsta->ssid_len);
748 mod_timer(&ifsta->timer, jiffies + IEEE80211_AUTH_TIMEOUT);
752 static void ieee80211_authenticate(struct ieee80211_sub_if_data *sdata,
753 struct ieee80211_if_sta *ifsta)
755 DECLARE_MAC_BUF(mac);
758 if (ifsta->auth_tries > IEEE80211_AUTH_MAX_TRIES) {
759 printk(KERN_DEBUG "%s: authentication with AP %s"
761 sdata->dev->name, print_mac(mac, ifsta->bssid));
762 ifsta->state = IEEE80211_STA_MLME_DISABLED;
766 ifsta->state = IEEE80211_STA_MLME_AUTHENTICATE;
767 printk(KERN_DEBUG "%s: authenticate with AP %s\n",
768 sdata->dev->name, print_mac(mac, ifsta->bssid));
770 ieee80211_send_auth(sdata, ifsta, 1, NULL, 0, 0);
772 mod_timer(&ifsta->timer, jiffies + IEEE80211_AUTH_TIMEOUT);
775 static void ieee80211_set_disassoc(struct ieee80211_sub_if_data *sdata,
776 struct ieee80211_if_sta *ifsta, bool deauth,
777 bool self_disconnected, u16 reason)
779 struct ieee80211_local *local = sdata->local;
780 struct sta_info *sta;
781 u32 changed = BSS_CHANGED_ASSOC;
785 sta = sta_info_get(local, ifsta->bssid);
792 ifsta->direct_probe_tries = 0;
793 ifsta->auth_tries = 0;
795 ifsta->assoc_scan_tries = 0;
796 ifsta->assoc_tries = 0;
798 netif_tx_stop_all_queues(sdata->dev);
799 netif_carrier_off(sdata->dev);
801 ieee80211_sta_tear_down_BA_sessions(sdata, sta->addr);
803 if (self_disconnected) {
805 ieee80211_send_deauth_disassoc(sdata,
806 IEEE80211_STYPE_DEAUTH, reason);
808 ieee80211_send_deauth_disassoc(sdata,
809 IEEE80211_STYPE_DISASSOC, reason);
812 ifsta->flags &= ~IEEE80211_STA_ASSOCIATED;
813 changed |= ieee80211_reset_erp_info(sdata);
815 if (sdata->bss_conf.assoc_ht)
816 changed |= BSS_CHANGED_HT;
818 sdata->bss_conf.assoc_ht = 0;
819 sdata->bss_conf.ht_conf = NULL;
820 sdata->bss_conf.ht_bss_conf = NULL;
822 ieee80211_led_assoc(local, 0);
823 sdata->bss_conf.assoc = 0;
825 ieee80211_sta_send_apinfo(sdata, ifsta);
827 if (self_disconnected)
828 ifsta->state = IEEE80211_STA_MLME_DISABLED;
830 sta_info_unlink(&sta);
834 sta_info_destroy(sta);
837 static int ieee80211_sta_wep_configured(struct ieee80211_sub_if_data *sdata)
839 if (!sdata || !sdata->default_key ||
840 sdata->default_key->conf.alg != ALG_WEP)
845 static int ieee80211_privacy_mismatch(struct ieee80211_sub_if_data *sdata,
846 struct ieee80211_if_sta *ifsta)
848 struct ieee80211_local *local = sdata->local;
849 struct ieee80211_bss *bss;
854 if (!ifsta || (ifsta->flags & IEEE80211_STA_MIXED_CELL))
857 bss = ieee80211_rx_bss_get(local, ifsta->bssid,
858 local->hw.conf.channel->center_freq,
859 ifsta->ssid, ifsta->ssid_len);
863 bss_privacy = !!(bss->capability & WLAN_CAPABILITY_PRIVACY);
864 wep_privacy = !!ieee80211_sta_wep_configured(sdata);
865 privacy_invoked = !!(ifsta->flags & IEEE80211_STA_PRIVACY_INVOKED);
867 ieee80211_rx_bss_put(local, bss);
869 if ((bss_privacy == wep_privacy) || (bss_privacy == privacy_invoked))
875 static void ieee80211_associate(struct ieee80211_sub_if_data *sdata,
876 struct ieee80211_if_sta *ifsta)
878 DECLARE_MAC_BUF(mac);
880 ifsta->assoc_tries++;
881 if (ifsta->assoc_tries > IEEE80211_ASSOC_MAX_TRIES) {
882 printk(KERN_DEBUG "%s: association with AP %s"
884 sdata->dev->name, print_mac(mac, ifsta->bssid));
885 ifsta->state = IEEE80211_STA_MLME_DISABLED;
889 ifsta->state = IEEE80211_STA_MLME_ASSOCIATE;
890 printk(KERN_DEBUG "%s: associate with AP %s\n",
891 sdata->dev->name, print_mac(mac, ifsta->bssid));
892 if (ieee80211_privacy_mismatch(sdata, ifsta)) {
893 printk(KERN_DEBUG "%s: mismatch in privacy configuration and "
894 "mixed-cell disabled - abort association\n", sdata->dev->name);
895 ifsta->state = IEEE80211_STA_MLME_DISABLED;
899 ieee80211_send_assoc(sdata, ifsta);
901 mod_timer(&ifsta->timer, jiffies + IEEE80211_ASSOC_TIMEOUT);
905 static void ieee80211_associated(struct ieee80211_sub_if_data *sdata,
906 struct ieee80211_if_sta *ifsta)
908 struct ieee80211_local *local = sdata->local;
909 struct sta_info *sta;
911 DECLARE_MAC_BUF(mac);
913 /* TODO: start monitoring current AP signal quality and number of
914 * missed beacons. Scan other channels every now and then and search
916 /* TODO: remove expired BSSes */
918 ifsta->state = IEEE80211_STA_MLME_ASSOCIATED;
922 sta = sta_info_get(local, ifsta->bssid);
924 printk(KERN_DEBUG "%s: No STA entry for own AP %s\n",
925 sdata->dev->name, print_mac(mac, ifsta->bssid));
929 if (time_after(jiffies,
930 sta->last_rx + IEEE80211_MONITORING_INTERVAL)) {
931 if (ifsta->flags & IEEE80211_STA_PROBEREQ_POLL) {
932 printk(KERN_DEBUG "%s: No ProbeResp from "
933 "current AP %s - assume out of "
935 sdata->dev->name, print_mac(mac, ifsta->bssid));
938 ieee80211_send_probe_req(sdata, ifsta->bssid,
940 local->scan_ssid_len);
941 ifsta->flags ^= IEEE80211_STA_PROBEREQ_POLL;
943 ifsta->flags &= ~IEEE80211_STA_PROBEREQ_POLL;
944 if (time_after(jiffies, ifsta->last_probe +
945 IEEE80211_PROBE_INTERVAL)) {
946 ifsta->last_probe = jiffies;
947 ieee80211_send_probe_req(sdata, ifsta->bssid,
957 ieee80211_set_disassoc(sdata, ifsta, true, true,
958 WLAN_REASON_PREV_AUTH_NOT_VALID);
960 mod_timer(&ifsta->timer, jiffies +
961 IEEE80211_MONITORING_INTERVAL);
965 static void ieee80211_auth_completed(struct ieee80211_sub_if_data *sdata,
966 struct ieee80211_if_sta *ifsta)
968 printk(KERN_DEBUG "%s: authenticated\n", sdata->dev->name);
969 ifsta->flags |= IEEE80211_STA_AUTHENTICATED;
970 ieee80211_associate(sdata, ifsta);
974 static void ieee80211_auth_challenge(struct ieee80211_sub_if_data *sdata,
975 struct ieee80211_if_sta *ifsta,
976 struct ieee80211_mgmt *mgmt,
980 struct ieee802_11_elems elems;
982 pos = mgmt->u.auth.variable;
983 ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), &elems);
984 if (!elems.challenge)
986 ieee80211_send_auth(sdata, ifsta, 3, elems.challenge - 2,
987 elems.challenge_len + 2, 1);
990 static void ieee80211_rx_mgmt_auth(struct ieee80211_sub_if_data *sdata,
991 struct ieee80211_if_sta *ifsta,
992 struct ieee80211_mgmt *mgmt,
995 u16 auth_alg, auth_transaction, status_code;
996 DECLARE_MAC_BUF(mac);
998 if (ifsta->state != IEEE80211_STA_MLME_AUTHENTICATE &&
999 sdata->vif.type != IEEE80211_IF_TYPE_IBSS)
1005 if (sdata->vif.type != IEEE80211_IF_TYPE_IBSS &&
1006 memcmp(ifsta->bssid, mgmt->sa, ETH_ALEN) != 0)
1009 if (sdata->vif.type != IEEE80211_IF_TYPE_IBSS &&
1010 memcmp(ifsta->bssid, mgmt->bssid, ETH_ALEN) != 0)
1013 auth_alg = le16_to_cpu(mgmt->u.auth.auth_alg);
1014 auth_transaction = le16_to_cpu(mgmt->u.auth.auth_transaction);
1015 status_code = le16_to_cpu(mgmt->u.auth.status_code);
1017 if (sdata->vif.type == IEEE80211_IF_TYPE_IBSS) {
1019 * IEEE 802.11 standard does not require authentication in IBSS
1020 * networks and most implementations do not seem to use it.
1021 * However, try to reply to authentication attempts if someone
1022 * has actually implemented this.
1024 if (auth_alg != WLAN_AUTH_OPEN || auth_transaction != 1)
1026 ieee80211_send_auth(sdata, ifsta, 2, NULL, 0, 0);
1029 if (auth_alg != ifsta->auth_alg ||
1030 auth_transaction != ifsta->auth_transaction)
1033 if (status_code != WLAN_STATUS_SUCCESS) {
1034 if (status_code == WLAN_STATUS_NOT_SUPPORTED_AUTH_ALG) {
1036 const int num_algs = ARRAY_SIZE(algs);
1038 algs[0] = algs[1] = algs[2] = 0xff;
1039 if (ifsta->auth_algs & IEEE80211_AUTH_ALG_OPEN)
1040 algs[0] = WLAN_AUTH_OPEN;
1041 if (ifsta->auth_algs & IEEE80211_AUTH_ALG_SHARED_KEY)
1042 algs[1] = WLAN_AUTH_SHARED_KEY;
1043 if (ifsta->auth_algs & IEEE80211_AUTH_ALG_LEAP)
1044 algs[2] = WLAN_AUTH_LEAP;
1045 if (ifsta->auth_alg == WLAN_AUTH_OPEN)
1047 else if (ifsta->auth_alg == WLAN_AUTH_SHARED_KEY)
1051 for (i = 0; i < num_algs; i++) {
1053 if (pos >= num_algs)
1055 if (algs[pos] == ifsta->auth_alg ||
1058 if (algs[pos] == WLAN_AUTH_SHARED_KEY &&
1059 !ieee80211_sta_wep_configured(sdata))
1061 ifsta->auth_alg = algs[pos];
1068 switch (ifsta->auth_alg) {
1069 case WLAN_AUTH_OPEN:
1070 case WLAN_AUTH_LEAP:
1071 ieee80211_auth_completed(sdata, ifsta);
1073 case WLAN_AUTH_SHARED_KEY:
1074 if (ifsta->auth_transaction == 4)
1075 ieee80211_auth_completed(sdata, ifsta);
1077 ieee80211_auth_challenge(sdata, ifsta, mgmt, len);
1083 static void ieee80211_rx_mgmt_deauth(struct ieee80211_sub_if_data *sdata,
1084 struct ieee80211_if_sta *ifsta,
1085 struct ieee80211_mgmt *mgmt,
1089 DECLARE_MAC_BUF(mac);
1094 if (memcmp(ifsta->bssid, mgmt->sa, ETH_ALEN))
1097 reason_code = le16_to_cpu(mgmt->u.deauth.reason_code);
1099 if (ifsta->flags & IEEE80211_STA_AUTHENTICATED)
1100 printk(KERN_DEBUG "%s: deauthenticated\n", sdata->dev->name);
1102 if (ifsta->state == IEEE80211_STA_MLME_AUTHENTICATE ||
1103 ifsta->state == IEEE80211_STA_MLME_ASSOCIATE ||
1104 ifsta->state == IEEE80211_STA_MLME_ASSOCIATED) {
1105 ifsta->state = IEEE80211_STA_MLME_DIRECT_PROBE;
1106 mod_timer(&ifsta->timer, jiffies +
1107 IEEE80211_RETRY_AUTH_INTERVAL);
1110 ieee80211_set_disassoc(sdata, ifsta, true, false, 0);
1111 ifsta->flags &= ~IEEE80211_STA_AUTHENTICATED;
1115 static void ieee80211_rx_mgmt_disassoc(struct ieee80211_sub_if_data *sdata,
1116 struct ieee80211_if_sta *ifsta,
1117 struct ieee80211_mgmt *mgmt,
1121 DECLARE_MAC_BUF(mac);
1126 if (memcmp(ifsta->bssid, mgmt->sa, ETH_ALEN))
1129 reason_code = le16_to_cpu(mgmt->u.disassoc.reason_code);
1131 if (ifsta->flags & IEEE80211_STA_ASSOCIATED)
1132 printk(KERN_DEBUG "%s: disassociated\n", sdata->dev->name);
1134 if (ifsta->state == IEEE80211_STA_MLME_ASSOCIATED) {
1135 ifsta->state = IEEE80211_STA_MLME_ASSOCIATE;
1136 mod_timer(&ifsta->timer, jiffies +
1137 IEEE80211_RETRY_AUTH_INTERVAL);
1140 ieee80211_set_disassoc(sdata, ifsta, false, false, 0);
1144 static void ieee80211_rx_mgmt_assoc_resp(struct ieee80211_sub_if_data *sdata,
1145 struct ieee80211_if_sta *ifsta,
1146 struct ieee80211_mgmt *mgmt,
1150 struct ieee80211_local *local = sdata->local;
1151 struct ieee80211_supported_band *sband;
1152 struct sta_info *sta;
1153 u64 rates, basic_rates;
1154 u16 capab_info, status_code, aid;
1155 struct ieee802_11_elems elems;
1156 struct ieee80211_bss_conf *bss_conf = &sdata->bss_conf;
1159 DECLARE_MAC_BUF(mac);
1160 bool have_higher_than_11mbit = false;
1162 /* AssocResp and ReassocResp have identical structure, so process both
1163 * of them in this function. */
1165 if (ifsta->state != IEEE80211_STA_MLME_ASSOCIATE)
1171 if (memcmp(ifsta->bssid, mgmt->sa, ETH_ALEN) != 0)
1174 capab_info = le16_to_cpu(mgmt->u.assoc_resp.capab_info);
1175 status_code = le16_to_cpu(mgmt->u.assoc_resp.status_code);
1176 aid = le16_to_cpu(mgmt->u.assoc_resp.aid);
1178 printk(KERN_DEBUG "%s: RX %sssocResp from %s (capab=0x%x "
1179 "status=%d aid=%d)\n",
1180 sdata->dev->name, reassoc ? "Rea" : "A", print_mac(mac, mgmt->sa),
1181 capab_info, status_code, (u16)(aid & ~(BIT(15) | BIT(14))));
1183 if (status_code != WLAN_STATUS_SUCCESS) {
1184 printk(KERN_DEBUG "%s: AP denied association (code=%d)\n",
1185 sdata->dev->name, status_code);
1186 /* if this was a reassociation, ensure we try a "full"
1187 * association next time. This works around some broken APs
1188 * which do not correctly reject reassociation requests. */
1189 ifsta->flags &= ~IEEE80211_STA_PREV_BSSID_SET;
1193 if ((aid & (BIT(15) | BIT(14))) != (BIT(15) | BIT(14)))
1194 printk(KERN_DEBUG "%s: invalid aid value %d; bits 15:14 not "
1195 "set\n", sdata->dev->name, aid);
1196 aid &= ~(BIT(15) | BIT(14));
1198 pos = mgmt->u.assoc_resp.variable;
1199 ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), &elems);
1201 if (!elems.supp_rates) {
1202 printk(KERN_DEBUG "%s: no SuppRates element in AssocResp\n",
1207 printk(KERN_DEBUG "%s: associated\n", sdata->dev->name);
1209 ifsta->ap_capab = capab_info;
1211 kfree(ifsta->assocresp_ies);
1212 ifsta->assocresp_ies_len = len - (pos - (u8 *) mgmt);
1213 ifsta->assocresp_ies = kmalloc(ifsta->assocresp_ies_len, GFP_KERNEL);
1214 if (ifsta->assocresp_ies)
1215 memcpy(ifsta->assocresp_ies, pos, ifsta->assocresp_ies_len);
1219 /* Add STA entry for the AP */
1220 sta = sta_info_get(local, ifsta->bssid);
1222 struct ieee80211_bss *bss;
1225 sta = sta_info_alloc(sdata, ifsta->bssid, GFP_ATOMIC);
1227 printk(KERN_DEBUG "%s: failed to alloc STA entry for"
1228 " the AP\n", sdata->dev->name);
1232 bss = ieee80211_rx_bss_get(local, ifsta->bssid,
1233 local->hw.conf.channel->center_freq,
1234 ifsta->ssid, ifsta->ssid_len);
1236 sta->last_signal = bss->signal;
1237 sta->last_qual = bss->qual;
1238 sta->last_noise = bss->noise;
1239 ieee80211_rx_bss_put(local, bss);
1242 err = sta_info_insert(sta);
1244 printk(KERN_DEBUG "%s: failed to insert STA entry for"
1245 " the AP (error %d)\n", sdata->dev->name, err);
1249 /* update new sta with its last rx activity */
1250 sta->last_rx = jiffies;
1254 * FIXME: Do we really need to update the sta_info's information here?
1255 * We already know about the AP (we found it in our list) so it
1256 * should already be filled with the right info, no?
1257 * As is stands, all this is racy because typically we assume
1258 * the information that is filled in here (except flags) doesn't
1259 * change while a STA structure is alive. As such, it should move
1260 * to between the sta_info_alloc() and sta_info_insert() above.
1263 set_sta_flags(sta, WLAN_STA_AUTH | WLAN_STA_ASSOC | WLAN_STA_ASSOC_AP |
1264 WLAN_STA_AUTHORIZED);
1268 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
1270 for (i = 0; i < elems.supp_rates_len; i++) {
1271 int rate = (elems.supp_rates[i] & 0x7f) * 5;
1274 have_higher_than_11mbit = true;
1276 for (j = 0; j < sband->n_bitrates; j++) {
1277 if (sband->bitrates[j].bitrate == rate)
1279 if (elems.supp_rates[i] & 0x80)
1280 basic_rates |= BIT(j);
1284 for (i = 0; i < elems.ext_supp_rates_len; i++) {
1285 int rate = (elems.ext_supp_rates[i] & 0x7f) * 5;
1288 have_higher_than_11mbit = true;
1290 for (j = 0; j < sband->n_bitrates; j++) {
1291 if (sband->bitrates[j].bitrate == rate)
1293 if (elems.ext_supp_rates[i] & 0x80)
1294 basic_rates |= BIT(j);
1298 sta->supp_rates[local->hw.conf.channel->band] = rates;
1299 sdata->basic_rates = basic_rates;
1301 /* cf. IEEE 802.11 9.2.12 */
1302 if (local->hw.conf.channel->band == IEEE80211_BAND_2GHZ &&
1303 have_higher_than_11mbit)
1304 sdata->flags |= IEEE80211_SDATA_OPERATING_GMODE;
1306 sdata->flags &= ~IEEE80211_SDATA_OPERATING_GMODE;
1308 if (elems.ht_cap_elem && elems.ht_info_elem && elems.wmm_param &&
1309 (ifsta->flags & IEEE80211_STA_WMM_ENABLED)) {
1310 struct ieee80211_ht_bss_info bss_info;
1311 ieee80211_ht_cap_ie_to_ht_info(
1312 (struct ieee80211_ht_cap *)
1313 elems.ht_cap_elem, &sta->ht_info);
1314 ieee80211_ht_addt_info_ie_to_ht_bss_info(
1315 (struct ieee80211_ht_addt_info *)
1316 elems.ht_info_elem, &bss_info);
1317 ieee80211_handle_ht(local, 1, &sta->ht_info, &bss_info);
1320 rate_control_rate_init(sta, local);
1322 if (elems.wmm_param) {
1323 set_sta_flags(sta, WLAN_STA_WME);
1325 ieee80211_sta_wmm_params(local, ifsta, elems.wmm_param,
1326 elems.wmm_param_len);
1330 /* set AID and assoc capability,
1331 * ieee80211_set_associated() will tell the driver */
1332 bss_conf->aid = aid;
1333 bss_conf->assoc_capability = capab_info;
1334 ieee80211_set_associated(sdata, ifsta);
1336 ieee80211_associated(sdata, ifsta);
1340 static int ieee80211_sta_join_ibss(struct ieee80211_sub_if_data *sdata,
1341 struct ieee80211_if_sta *ifsta,
1342 struct ieee80211_bss *bss)
1344 struct ieee80211_local *local = sdata->local;
1345 int res, rates, i, j;
1346 struct sk_buff *skb;
1347 struct ieee80211_mgmt *mgmt;
1349 struct ieee80211_supported_band *sband;
1350 union iwreq_data wrqu;
1352 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
1354 /* Remove possible STA entries from other IBSS networks. */
1355 sta_info_flush_delayed(sdata);
1357 if (local->ops->reset_tsf) {
1358 /* Reset own TSF to allow time synchronization work. */
1359 local->ops->reset_tsf(local_to_hw(local));
1361 memcpy(ifsta->bssid, bss->bssid, ETH_ALEN);
1362 res = ieee80211_if_config(sdata, IEEE80211_IFCC_BSSID);
1366 local->hw.conf.beacon_int = bss->beacon_int >= 10 ? bss->beacon_int : 10;
1368 sdata->drop_unencrypted = bss->capability &
1369 WLAN_CAPABILITY_PRIVACY ? 1 : 0;
1371 res = ieee80211_set_freq(sdata, bss->freq);
1376 /* Build IBSS probe response */
1377 skb = dev_alloc_skb(local->hw.extra_tx_headroom + 400);
1379 skb_reserve(skb, local->hw.extra_tx_headroom);
1381 mgmt = (struct ieee80211_mgmt *)
1382 skb_put(skb, 24 + sizeof(mgmt->u.beacon));
1383 memset(mgmt, 0, 24 + sizeof(mgmt->u.beacon));
1384 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
1385 IEEE80211_STYPE_PROBE_RESP);
1386 memset(mgmt->da, 0xff, ETH_ALEN);
1387 memcpy(mgmt->sa, sdata->dev->dev_addr, ETH_ALEN);
1388 memcpy(mgmt->bssid, ifsta->bssid, ETH_ALEN);
1389 mgmt->u.beacon.beacon_int =
1390 cpu_to_le16(local->hw.conf.beacon_int);
1391 mgmt->u.beacon.timestamp = cpu_to_le64(bss->timestamp);
1392 mgmt->u.beacon.capab_info = cpu_to_le16(bss->capability);
1394 pos = skb_put(skb, 2 + ifsta->ssid_len);
1395 *pos++ = WLAN_EID_SSID;
1396 *pos++ = ifsta->ssid_len;
1397 memcpy(pos, ifsta->ssid, ifsta->ssid_len);
1399 rates = bss->supp_rates_len;
1402 pos = skb_put(skb, 2 + rates);
1403 *pos++ = WLAN_EID_SUPP_RATES;
1405 memcpy(pos, bss->supp_rates, rates);
1407 if (bss->band == IEEE80211_BAND_2GHZ) {
1408 pos = skb_put(skb, 2 + 1);
1409 *pos++ = WLAN_EID_DS_PARAMS;
1411 *pos++ = ieee80211_frequency_to_channel(bss->freq);
1414 pos = skb_put(skb, 2 + 2);
1415 *pos++ = WLAN_EID_IBSS_PARAMS;
1417 /* FIX: set ATIM window based on scan results */
1421 if (bss->supp_rates_len > 8) {
1422 rates = bss->supp_rates_len - 8;
1423 pos = skb_put(skb, 2 + rates);
1424 *pos++ = WLAN_EID_EXT_SUPP_RATES;
1426 memcpy(pos, &bss->supp_rates[8], rates);
1429 ifsta->probe_resp = skb;
1431 ieee80211_if_config(sdata, IEEE80211_IFCC_BEACON);
1435 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
1436 for (i = 0; i < bss->supp_rates_len; i++) {
1437 int bitrate = (bss->supp_rates[i] & 0x7f) * 5;
1438 for (j = 0; j < sband->n_bitrates; j++)
1439 if (sband->bitrates[j].bitrate == bitrate)
1442 ifsta->supp_rates_bits[local->hw.conf.channel->band] = rates;
1444 ieee80211_sta_def_wmm_params(sdata, bss);
1446 ifsta->state = IEEE80211_STA_MLME_IBSS_JOINED;
1447 mod_timer(&ifsta->timer, jiffies + IEEE80211_IBSS_MERGE_INTERVAL);
1449 memset(&wrqu, 0, sizeof(wrqu));
1450 memcpy(wrqu.ap_addr.sa_data, bss->bssid, ETH_ALEN);
1451 wireless_send_event(sdata->dev, SIOCGIWAP, &wrqu, NULL);
1456 static u64 ieee80211_sta_get_mandatory_rates(struct ieee80211_local *local,
1457 enum ieee80211_band band)
1459 struct ieee80211_supported_band *sband;
1460 struct ieee80211_rate *bitrates;
1461 u64 mandatory_rates;
1462 enum ieee80211_rate_flags mandatory_flag;
1465 sband = local->hw.wiphy->bands[band];
1468 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
1471 if (band == IEEE80211_BAND_2GHZ)
1472 mandatory_flag = IEEE80211_RATE_MANDATORY_B;
1474 mandatory_flag = IEEE80211_RATE_MANDATORY_A;
1476 bitrates = sband->bitrates;
1477 mandatory_rates = 0;
1478 for (i = 0; i < sband->n_bitrates; i++)
1479 if (bitrates[i].flags & mandatory_flag)
1480 mandatory_rates |= BIT(i);
1481 return mandatory_rates;
1484 static void ieee80211_rx_bss_info(struct ieee80211_sub_if_data *sdata,
1485 struct ieee80211_mgmt *mgmt,
1487 struct ieee80211_rx_status *rx_status,
1488 struct ieee802_11_elems *elems,
1491 struct ieee80211_local *local = sdata->local;
1493 struct ieee80211_bss *bss;
1494 struct sta_info *sta;
1495 struct ieee80211_channel *channel;
1496 u64 beacon_timestamp, rx_timestamp;
1498 enum ieee80211_band band = rx_status->band;
1499 DECLARE_MAC_BUF(mac);
1500 DECLARE_MAC_BUF(mac2);
1502 if (elems->ds_params && elems->ds_params_len == 1)
1503 freq = ieee80211_channel_to_frequency(elems->ds_params[0]);
1505 freq = rx_status->freq;
1507 channel = ieee80211_get_channel(local->hw.wiphy, freq);
1509 if (!channel || channel->flags & IEEE80211_CHAN_DISABLED)
1512 if (sdata->vif.type == IEEE80211_IF_TYPE_IBSS && elems->supp_rates &&
1513 memcmp(mgmt->bssid, sdata->u.sta.bssid, ETH_ALEN) == 0) {
1514 supp_rates = ieee80211_sta_get_rates(local, elems, band);
1518 sta = sta_info_get(local, mgmt->sa);
1522 prev_rates = sta->supp_rates[band];
1523 /* make sure mandatory rates are always added */
1524 sta->supp_rates[band] = supp_rates |
1525 ieee80211_sta_get_mandatory_rates(local, band);
1527 #ifdef CONFIG_MAC80211_IBSS_DEBUG
1528 if (sta->supp_rates[band] != prev_rates)
1529 printk(KERN_DEBUG "%s: updated supp_rates set "
1530 "for %s based on beacon info (0x%llx | "
1531 "0x%llx -> 0x%llx)\n",
1532 sdata->dev->name, print_mac(mac, sta->addr),
1533 (unsigned long long) prev_rates,
1534 (unsigned long long) supp_rates,
1535 (unsigned long long) sta->supp_rates[band]);
1538 ieee80211_ibss_add_sta(sdata, NULL, mgmt->bssid,
1539 mgmt->sa, supp_rates);
1545 bss = ieee80211_bss_info_update(local, rx_status, mgmt, len, elems,
1550 /* was just updated in ieee80211_bss_info_update */
1551 beacon_timestamp = bss->timestamp;
1554 * In STA mode, the remaining parameters should not be overridden
1555 * by beacons because they're not necessarily accurate there.
1557 if (sdata->vif.type != IEEE80211_IF_TYPE_IBSS &&
1558 bss->last_probe_resp && beacon) {
1559 ieee80211_rx_bss_put(local, bss);
1563 /* check if we need to merge IBSS */
1564 if (sdata->vif.type == IEEE80211_IF_TYPE_IBSS && beacon &&
1565 bss->capability & WLAN_CAPABILITY_IBSS &&
1566 bss->freq == local->oper_channel->center_freq &&
1567 elems->ssid_len == sdata->u.sta.ssid_len &&
1568 memcmp(elems->ssid, sdata->u.sta.ssid,
1569 sdata->u.sta.ssid_len) == 0) {
1570 if (rx_status->flag & RX_FLAG_TSFT) {
1571 /* in order for correct IBSS merging we need mactime
1573 * since mactime is defined as the time the first data
1574 * symbol of the frame hits the PHY, and the timestamp
1575 * of the beacon is defined as "the time that the data
1576 * symbol containing the first bit of the timestamp is
1577 * transmitted to the PHY plus the transmitting STA’s
1578 * delays through its local PHY from the MAC-PHY
1579 * interface to its interface with the WM"
1580 * (802.11 11.1.2) - equals the time this bit arrives at
1581 * the receiver - we have to take into account the
1582 * offset between the two.
1583 * e.g: at 1 MBit that means mactime is 192 usec earlier
1584 * (=24 bytes * 8 usecs/byte) than the beacon timestamp.
1586 int rate = local->hw.wiphy->bands[band]->
1587 bitrates[rx_status->rate_idx].bitrate;
1588 rx_timestamp = rx_status->mactime + (24 * 8 * 10 / rate);
1589 } else if (local && local->ops && local->ops->get_tsf)
1590 /* second best option: get current TSF */
1591 rx_timestamp = local->ops->get_tsf(local_to_hw(local));
1593 /* can't merge without knowing the TSF */
1594 rx_timestamp = -1LLU;
1595 #ifdef CONFIG_MAC80211_IBSS_DEBUG
1596 printk(KERN_DEBUG "RX beacon SA=%s BSSID="
1597 "%s TSF=0x%llx BCN=0x%llx diff=%lld @%lu\n",
1598 print_mac(mac, mgmt->sa),
1599 print_mac(mac2, mgmt->bssid),
1600 (unsigned long long)rx_timestamp,
1601 (unsigned long long)beacon_timestamp,
1602 (unsigned long long)(rx_timestamp - beacon_timestamp),
1604 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
1605 if (beacon_timestamp > rx_timestamp) {
1606 #ifdef CONFIG_MAC80211_IBSS_DEBUG
1607 printk(KERN_DEBUG "%s: beacon TSF higher than "
1608 "local TSF - IBSS merge with BSSID %s\n",
1609 sdata->dev->name, print_mac(mac, mgmt->bssid));
1611 ieee80211_sta_join_ibss(sdata, &sdata->u.sta, bss);
1612 ieee80211_ibss_add_sta(sdata, NULL,
1613 mgmt->bssid, mgmt->sa,
1618 ieee80211_rx_bss_put(local, bss);
1622 static void ieee80211_rx_mgmt_probe_resp(struct ieee80211_sub_if_data *sdata,
1623 struct ieee80211_mgmt *mgmt,
1625 struct ieee80211_rx_status *rx_status)
1628 struct ieee802_11_elems elems;
1629 struct ieee80211_if_sta *ifsta = &sdata->u.sta;
1631 if (memcmp(mgmt->da, sdata->dev->dev_addr, ETH_ALEN))
1632 return; /* ignore ProbeResp to foreign address */
1634 baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt;
1638 ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen,
1641 ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems, false);
1643 /* direct probe may be part of the association flow */
1644 if (test_and_clear_bit(IEEE80211_STA_REQ_DIRECT_PROBE,
1646 printk(KERN_DEBUG "%s direct probe responded\n",
1648 ieee80211_authenticate(sdata, ifsta);
1653 static void ieee80211_rx_mgmt_beacon(struct ieee80211_sub_if_data *sdata,
1654 struct ieee80211_mgmt *mgmt,
1656 struct ieee80211_rx_status *rx_status)
1658 struct ieee80211_if_sta *ifsta;
1660 struct ieee802_11_elems elems;
1661 struct ieee80211_local *local = sdata->local;
1662 struct ieee80211_conf *conf = &local->hw.conf;
1665 /* Process beacon from the current BSS */
1666 baselen = (u8 *) mgmt->u.beacon.variable - (u8 *) mgmt;
1670 ieee802_11_parse_elems(mgmt->u.beacon.variable, len - baselen, &elems);
1672 ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems, true);
1674 if (sdata->vif.type != IEEE80211_IF_TYPE_STA)
1676 ifsta = &sdata->u.sta;
1678 if (!(ifsta->flags & IEEE80211_STA_ASSOCIATED) ||
1679 memcmp(ifsta->bssid, mgmt->bssid, ETH_ALEN) != 0)
1682 ieee80211_sta_wmm_params(local, ifsta, elems.wmm_param,
1683 elems.wmm_param_len);
1685 if (elems.erp_info && elems.erp_info_len >= 1)
1686 changed |= ieee80211_handle_erp_ie(sdata, elems.erp_info[0]);
1688 u16 capab = le16_to_cpu(mgmt->u.beacon.capab_info);
1689 changed |= ieee80211_handle_protect_preamb(sdata, false,
1690 (capab & WLAN_CAPABILITY_SHORT_PREAMBLE) != 0);
1693 if (elems.ht_cap_elem && elems.ht_info_elem &&
1694 elems.wmm_param && conf->flags & IEEE80211_CONF_SUPPORT_HT_MODE) {
1695 struct ieee80211_ht_bss_info bss_info;
1697 ieee80211_ht_addt_info_ie_to_ht_bss_info(
1698 (struct ieee80211_ht_addt_info *)
1699 elems.ht_info_elem, &bss_info);
1700 changed |= ieee80211_handle_ht(local, 1, &conf->ht_conf,
1704 ieee80211_bss_info_change_notify(sdata, changed);
1708 static void ieee80211_rx_mgmt_probe_req(struct ieee80211_sub_if_data *sdata,
1709 struct ieee80211_if_sta *ifsta,
1710 struct ieee80211_mgmt *mgmt,
1712 struct ieee80211_rx_status *rx_status)
1714 struct ieee80211_local *local = sdata->local;
1716 struct sk_buff *skb;
1717 struct ieee80211_mgmt *resp;
1719 DECLARE_MAC_BUF(mac);
1720 #ifdef CONFIG_MAC80211_IBSS_DEBUG
1721 DECLARE_MAC_BUF(mac2);
1722 DECLARE_MAC_BUF(mac3);
1725 if (sdata->vif.type != IEEE80211_IF_TYPE_IBSS ||
1726 ifsta->state != IEEE80211_STA_MLME_IBSS_JOINED ||
1727 len < 24 + 2 || !ifsta->probe_resp)
1730 if (local->ops->tx_last_beacon)
1731 tx_last_beacon = local->ops->tx_last_beacon(local_to_hw(local));
1735 #ifdef CONFIG_MAC80211_IBSS_DEBUG
1736 printk(KERN_DEBUG "%s: RX ProbeReq SA=%s DA=%s BSSID="
1737 "%s (tx_last_beacon=%d)\n",
1738 sdata->dev->name, print_mac(mac, mgmt->sa), print_mac(mac2, mgmt->da),
1739 print_mac(mac3, mgmt->bssid), tx_last_beacon);
1740 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
1742 if (!tx_last_beacon)
1745 if (memcmp(mgmt->bssid, ifsta->bssid, ETH_ALEN) != 0 &&
1746 memcmp(mgmt->bssid, "\xff\xff\xff\xff\xff\xff", ETH_ALEN) != 0)
1749 end = ((u8 *) mgmt) + len;
1750 pos = mgmt->u.probe_req.variable;
1751 if (pos[0] != WLAN_EID_SSID ||
1752 pos + 2 + pos[1] > end) {
1753 #ifdef CONFIG_MAC80211_IBSS_DEBUG
1754 printk(KERN_DEBUG "%s: Invalid SSID IE in ProbeReq "
1756 sdata->dev->name, print_mac(mac, mgmt->sa));
1761 (pos[1] != ifsta->ssid_len ||
1762 memcmp(pos + 2, ifsta->ssid, ifsta->ssid_len) != 0)) {
1763 /* Ignore ProbeReq for foreign SSID */
1767 /* Reply with ProbeResp */
1768 skb = skb_copy(ifsta->probe_resp, GFP_KERNEL);
1772 resp = (struct ieee80211_mgmt *) skb->data;
1773 memcpy(resp->da, mgmt->sa, ETH_ALEN);
1774 #ifdef CONFIG_MAC80211_IBSS_DEBUG
1775 printk(KERN_DEBUG "%s: Sending ProbeResp to %s\n",
1776 sdata->dev->name, print_mac(mac, resp->da));
1777 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
1778 ieee80211_tx_skb(sdata, skb, 0);
1781 void ieee80211_sta_rx_mgmt(struct ieee80211_sub_if_data *sdata, struct sk_buff *skb,
1782 struct ieee80211_rx_status *rx_status)
1784 struct ieee80211_local *local = sdata->local;
1785 struct ieee80211_if_sta *ifsta;
1786 struct ieee80211_mgmt *mgmt;
1792 ifsta = &sdata->u.sta;
1794 mgmt = (struct ieee80211_mgmt *) skb->data;
1795 fc = le16_to_cpu(mgmt->frame_control);
1797 switch (fc & IEEE80211_FCTL_STYPE) {
1798 case IEEE80211_STYPE_PROBE_REQ:
1799 case IEEE80211_STYPE_PROBE_RESP:
1800 case IEEE80211_STYPE_BEACON:
1801 memcpy(skb->cb, rx_status, sizeof(*rx_status));
1802 case IEEE80211_STYPE_AUTH:
1803 case IEEE80211_STYPE_ASSOC_RESP:
1804 case IEEE80211_STYPE_REASSOC_RESP:
1805 case IEEE80211_STYPE_DEAUTH:
1806 case IEEE80211_STYPE_DISASSOC:
1807 skb_queue_tail(&ifsta->skb_queue, skb);
1808 queue_work(local->hw.workqueue, &ifsta->work);
1816 static void ieee80211_sta_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata,
1817 struct sk_buff *skb)
1819 struct ieee80211_rx_status *rx_status;
1820 struct ieee80211_if_sta *ifsta;
1821 struct ieee80211_mgmt *mgmt;
1824 ifsta = &sdata->u.sta;
1826 rx_status = (struct ieee80211_rx_status *) skb->cb;
1827 mgmt = (struct ieee80211_mgmt *) skb->data;
1828 fc = le16_to_cpu(mgmt->frame_control);
1830 switch (fc & IEEE80211_FCTL_STYPE) {
1831 case IEEE80211_STYPE_PROBE_REQ:
1832 ieee80211_rx_mgmt_probe_req(sdata, ifsta, mgmt, skb->len,
1835 case IEEE80211_STYPE_PROBE_RESP:
1836 ieee80211_rx_mgmt_probe_resp(sdata, mgmt, skb->len, rx_status);
1838 case IEEE80211_STYPE_BEACON:
1839 ieee80211_rx_mgmt_beacon(sdata, mgmt, skb->len, rx_status);
1841 case IEEE80211_STYPE_AUTH:
1842 ieee80211_rx_mgmt_auth(sdata, ifsta, mgmt, skb->len);
1844 case IEEE80211_STYPE_ASSOC_RESP:
1845 ieee80211_rx_mgmt_assoc_resp(sdata, ifsta, mgmt, skb->len, 0);
1847 case IEEE80211_STYPE_REASSOC_RESP:
1848 ieee80211_rx_mgmt_assoc_resp(sdata, ifsta, mgmt, skb->len, 1);
1850 case IEEE80211_STYPE_DEAUTH:
1851 ieee80211_rx_mgmt_deauth(sdata, ifsta, mgmt, skb->len);
1853 case IEEE80211_STYPE_DISASSOC:
1854 ieee80211_rx_mgmt_disassoc(sdata, ifsta, mgmt, skb->len);
1862 static int ieee80211_sta_active_ibss(struct ieee80211_sub_if_data *sdata)
1864 struct ieee80211_local *local = sdata->local;
1866 struct sta_info *sta;
1870 list_for_each_entry_rcu(sta, &local->sta_list, list) {
1871 if (sta->sdata == sdata &&
1872 time_after(sta->last_rx + IEEE80211_IBSS_MERGE_INTERVAL,
1885 static void ieee80211_sta_merge_ibss(struct ieee80211_sub_if_data *sdata,
1886 struct ieee80211_if_sta *ifsta)
1888 mod_timer(&ifsta->timer, jiffies + IEEE80211_IBSS_MERGE_INTERVAL);
1890 ieee80211_sta_expire(sdata, IEEE80211_IBSS_INACTIVITY_LIMIT);
1891 if (ieee80211_sta_active_ibss(sdata))
1894 printk(KERN_DEBUG "%s: No active IBSS STAs - trying to scan for other "
1895 "IBSS networks with same SSID (merge)\n", sdata->dev->name);
1896 ieee80211_request_scan(sdata, ifsta->ssid, ifsta->ssid_len);
1900 static void ieee80211_sta_timer(unsigned long data)
1902 struct ieee80211_sub_if_data *sdata =
1903 (struct ieee80211_sub_if_data *) data;
1904 struct ieee80211_if_sta *ifsta = &sdata->u.sta;
1905 struct ieee80211_local *local = sdata->local;
1907 set_bit(IEEE80211_STA_REQ_RUN, &ifsta->request);
1908 queue_work(local->hw.workqueue, &ifsta->work);
1911 static void ieee80211_sta_reset_auth(struct ieee80211_sub_if_data *sdata,
1912 struct ieee80211_if_sta *ifsta)
1914 struct ieee80211_local *local = sdata->local;
1916 if (local->ops->reset_tsf) {
1917 /* Reset own TSF to allow time synchronization work. */
1918 local->ops->reset_tsf(local_to_hw(local));
1921 ifsta->wmm_last_param_set = -1; /* allow any WMM update */
1924 if (ifsta->auth_algs & IEEE80211_AUTH_ALG_OPEN)
1925 ifsta->auth_alg = WLAN_AUTH_OPEN;
1926 else if (ifsta->auth_algs & IEEE80211_AUTH_ALG_SHARED_KEY)
1927 ifsta->auth_alg = WLAN_AUTH_SHARED_KEY;
1928 else if (ifsta->auth_algs & IEEE80211_AUTH_ALG_LEAP)
1929 ifsta->auth_alg = WLAN_AUTH_LEAP;
1931 ifsta->auth_alg = WLAN_AUTH_OPEN;
1932 ifsta->auth_transaction = -1;
1933 ifsta->flags &= ~IEEE80211_STA_ASSOCIATED;
1934 ifsta->assoc_scan_tries = 0;
1935 ifsta->direct_probe_tries = 0;
1936 ifsta->auth_tries = 0;
1937 ifsta->assoc_tries = 0;
1938 netif_tx_stop_all_queues(sdata->dev);
1939 netif_carrier_off(sdata->dev);
1943 static int ieee80211_sta_match_ssid(struct ieee80211_if_sta *ifsta,
1944 const char *ssid, int ssid_len)
1946 int tmp, hidden_ssid;
1948 if (ssid_len == ifsta->ssid_len &&
1949 !memcmp(ifsta->ssid, ssid, ssid_len))
1952 if (ifsta->flags & IEEE80211_STA_AUTO_BSSID_SEL)
1958 if (ssid[tmp] != '\0') {
1964 if (hidden_ssid && ifsta->ssid_len == ssid_len)
1967 if (ssid_len == 1 && ssid[0] == ' ')
1973 static int ieee80211_sta_create_ibss(struct ieee80211_sub_if_data *sdata,
1974 struct ieee80211_if_sta *ifsta)
1976 struct ieee80211_local *local = sdata->local;
1977 struct ieee80211_bss *bss;
1978 struct ieee80211_supported_band *sband;
1979 u8 bssid[ETH_ALEN], *pos;
1982 DECLARE_MAC_BUF(mac);
1985 /* Easier testing, use fixed BSSID. */
1986 memset(bssid, 0xfe, ETH_ALEN);
1988 /* Generate random, not broadcast, locally administered BSSID. Mix in
1989 * own MAC address to make sure that devices that do not have proper
1990 * random number generator get different BSSID. */
1991 get_random_bytes(bssid, ETH_ALEN);
1992 for (i = 0; i < ETH_ALEN; i++)
1993 bssid[i] ^= sdata->dev->dev_addr[i];
1998 printk(KERN_DEBUG "%s: Creating new IBSS network, BSSID %s\n",
1999 sdata->dev->name, print_mac(mac, bssid));
2001 bss = ieee80211_rx_bss_add(local, bssid,
2002 local->hw.conf.channel->center_freq,
2003 sdata->u.sta.ssid, sdata->u.sta.ssid_len);
2007 bss->band = local->hw.conf.channel->band;
2008 sband = local->hw.wiphy->bands[bss->band];
2010 if (local->hw.conf.beacon_int == 0)
2011 local->hw.conf.beacon_int = 100;
2012 bss->beacon_int = local->hw.conf.beacon_int;
2013 bss->last_update = jiffies;
2014 bss->capability = WLAN_CAPABILITY_IBSS;
2016 if (sdata->default_key)
2017 bss->capability |= WLAN_CAPABILITY_PRIVACY;
2019 sdata->drop_unencrypted = 0;
2021 bss->supp_rates_len = sband->n_bitrates;
2022 pos = bss->supp_rates;
2023 for (i = 0; i < sband->n_bitrates; i++) {
2024 int rate = sband->bitrates[i].bitrate;
2025 *pos++ = (u8) (rate / 5);
2028 ret = ieee80211_sta_join_ibss(sdata, ifsta, bss);
2029 ieee80211_rx_bss_put(local, bss);
2034 static int ieee80211_sta_find_ibss(struct ieee80211_sub_if_data *sdata,
2035 struct ieee80211_if_sta *ifsta)
2037 struct ieee80211_local *local = sdata->local;
2038 struct ieee80211_bss *bss;
2042 DECLARE_MAC_BUF(mac);
2043 DECLARE_MAC_BUF(mac2);
2045 if (ifsta->ssid_len == 0)
2048 active_ibss = ieee80211_sta_active_ibss(sdata);
2049 #ifdef CONFIG_MAC80211_IBSS_DEBUG
2050 printk(KERN_DEBUG "%s: sta_find_ibss (active_ibss=%d)\n",
2051 sdata->dev->name, active_ibss);
2052 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
2053 spin_lock_bh(&local->bss_lock);
2054 list_for_each_entry(bss, &local->bss_list, list) {
2055 if (ifsta->ssid_len != bss->ssid_len ||
2056 memcmp(ifsta->ssid, bss->ssid, bss->ssid_len) != 0
2057 || !(bss->capability & WLAN_CAPABILITY_IBSS))
2059 #ifdef CONFIG_MAC80211_IBSS_DEBUG
2060 printk(KERN_DEBUG " bssid=%s found\n",
2061 print_mac(mac, bss->bssid));
2062 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
2063 memcpy(bssid, bss->bssid, ETH_ALEN);
2065 if (active_ibss || memcmp(bssid, ifsta->bssid, ETH_ALEN) != 0)
2068 spin_unlock_bh(&local->bss_lock);
2070 #ifdef CONFIG_MAC80211_IBSS_DEBUG
2072 printk(KERN_DEBUG " sta_find_ibss: selected %s current "
2073 "%s\n", print_mac(mac, bssid),
2074 print_mac(mac2, ifsta->bssid));
2075 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
2077 if (found && memcmp(ifsta->bssid, bssid, ETH_ALEN) != 0) {
2081 if (ifsta->flags & IEEE80211_STA_AUTO_CHANNEL_SEL)
2082 search_freq = bss->freq;
2084 search_freq = local->hw.conf.channel->center_freq;
2086 bss = ieee80211_rx_bss_get(local, bssid, search_freq,
2087 ifsta->ssid, ifsta->ssid_len);
2091 printk(KERN_DEBUG "%s: Selected IBSS BSSID %s"
2092 " based on configured SSID\n",
2093 sdata->dev->name, print_mac(mac, bssid));
2094 ret = ieee80211_sta_join_ibss(sdata, ifsta, bss);
2095 ieee80211_rx_bss_put(local, bss);
2100 #ifdef CONFIG_MAC80211_IBSS_DEBUG
2101 printk(KERN_DEBUG " did not try to join ibss\n");
2102 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
2104 /* Selected IBSS not found in current scan results - try to scan */
2105 if (ifsta->state == IEEE80211_STA_MLME_IBSS_JOINED &&
2106 !ieee80211_sta_active_ibss(sdata)) {
2107 mod_timer(&ifsta->timer, jiffies +
2108 IEEE80211_IBSS_MERGE_INTERVAL);
2109 } else if (time_after(jiffies, local->last_scan_completed +
2110 IEEE80211_SCAN_INTERVAL)) {
2111 printk(KERN_DEBUG "%s: Trigger new scan to find an IBSS to "
2112 "join\n", sdata->dev->name);
2113 return ieee80211_request_scan(sdata, ifsta->ssid,
2115 } else if (ifsta->state != IEEE80211_STA_MLME_IBSS_JOINED) {
2116 int interval = IEEE80211_SCAN_INTERVAL;
2118 if (time_after(jiffies, ifsta->ibss_join_req +
2119 IEEE80211_IBSS_JOIN_TIMEOUT)) {
2120 if ((ifsta->flags & IEEE80211_STA_CREATE_IBSS) &&
2121 (!(local->oper_channel->flags &
2122 IEEE80211_CHAN_NO_IBSS)))
2123 return ieee80211_sta_create_ibss(sdata, ifsta);
2124 if (ifsta->flags & IEEE80211_STA_CREATE_IBSS) {
2125 printk(KERN_DEBUG "%s: IBSS not allowed on"
2126 " %d MHz\n", sdata->dev->name,
2127 local->hw.conf.channel->center_freq);
2130 /* No IBSS found - decrease scan interval and continue
2132 interval = IEEE80211_SCAN_INTERVAL_SLOW;
2135 ifsta->state = IEEE80211_STA_MLME_IBSS_SEARCH;
2136 mod_timer(&ifsta->timer, jiffies + interval);
2144 static int ieee80211_sta_config_auth(struct ieee80211_sub_if_data *sdata,
2145 struct ieee80211_if_sta *ifsta)
2147 struct ieee80211_local *local = sdata->local;
2148 struct ieee80211_bss *bss, *selected = NULL;
2149 int top_rssi = 0, freq;
2151 spin_lock_bh(&local->bss_lock);
2152 freq = local->oper_channel->center_freq;
2153 list_for_each_entry(bss, &local->bss_list, list) {
2154 if (!(bss->capability & WLAN_CAPABILITY_ESS))
2157 if ((ifsta->flags & (IEEE80211_STA_AUTO_SSID_SEL |
2158 IEEE80211_STA_AUTO_BSSID_SEL |
2159 IEEE80211_STA_AUTO_CHANNEL_SEL)) &&
2160 (!!(bss->capability & WLAN_CAPABILITY_PRIVACY) ^
2161 !!sdata->default_key))
2164 if (!(ifsta->flags & IEEE80211_STA_AUTO_CHANNEL_SEL) &&
2168 if (!(ifsta->flags & IEEE80211_STA_AUTO_BSSID_SEL) &&
2169 memcmp(bss->bssid, ifsta->bssid, ETH_ALEN))
2172 if (!(ifsta->flags & IEEE80211_STA_AUTO_SSID_SEL) &&
2173 !ieee80211_sta_match_ssid(ifsta, bss->ssid, bss->ssid_len))
2176 if (!selected || top_rssi < bss->signal) {
2178 top_rssi = bss->signal;
2182 atomic_inc(&selected->users);
2183 spin_unlock_bh(&local->bss_lock);
2186 ieee80211_set_freq(sdata, selected->freq);
2187 if (!(ifsta->flags & IEEE80211_STA_SSID_SET))
2188 ieee80211_sta_set_ssid(sdata, selected->ssid,
2189 selected->ssid_len);
2190 ieee80211_sta_set_bssid(sdata, selected->bssid);
2191 ieee80211_sta_def_wmm_params(sdata, selected);
2193 /* Send out direct probe if no probe resp was received or
2194 * the one we have is outdated
2196 if (!selected->last_probe_resp ||
2197 time_after(jiffies, selected->last_probe_resp
2198 + IEEE80211_SCAN_RESULT_EXPIRE))
2199 ifsta->state = IEEE80211_STA_MLME_DIRECT_PROBE;
2201 ifsta->state = IEEE80211_STA_MLME_AUTHENTICATE;
2203 ieee80211_rx_bss_put(local, selected);
2204 ieee80211_sta_reset_auth(sdata, ifsta);
2207 if (ifsta->assoc_scan_tries < IEEE80211_ASSOC_SCANS_MAX_TRIES) {
2208 ifsta->assoc_scan_tries++;
2209 if (ifsta->flags & IEEE80211_STA_AUTO_SSID_SEL)
2210 ieee80211_start_scan(sdata, NULL, 0);
2212 ieee80211_start_scan(sdata, ifsta->ssid,
2214 ifsta->state = IEEE80211_STA_MLME_AUTHENTICATE;
2215 set_bit(IEEE80211_STA_REQ_AUTH, &ifsta->request);
2217 ifsta->state = IEEE80211_STA_MLME_DISABLED;
2223 static void ieee80211_sta_work(struct work_struct *work)
2225 struct ieee80211_sub_if_data *sdata =
2226 container_of(work, struct ieee80211_sub_if_data, u.sta.work);
2227 struct ieee80211_local *local = sdata->local;
2228 struct ieee80211_if_sta *ifsta;
2229 struct sk_buff *skb;
2231 if (!netif_running(sdata->dev))
2234 if (local->sw_scanning || local->hw_scanning)
2237 if (WARN_ON(sdata->vif.type != IEEE80211_IF_TYPE_STA &&
2238 sdata->vif.type != IEEE80211_IF_TYPE_IBSS))
2240 ifsta = &sdata->u.sta;
2242 while ((skb = skb_dequeue(&ifsta->skb_queue)))
2243 ieee80211_sta_rx_queued_mgmt(sdata, skb);
2245 if (ifsta->state != IEEE80211_STA_MLME_DIRECT_PROBE &&
2246 ifsta->state != IEEE80211_STA_MLME_AUTHENTICATE &&
2247 ifsta->state != IEEE80211_STA_MLME_ASSOCIATE &&
2248 test_and_clear_bit(IEEE80211_STA_REQ_SCAN, &ifsta->request)) {
2249 ieee80211_start_scan(sdata, ifsta->scan_ssid,
2250 ifsta->scan_ssid_len);
2254 if (test_and_clear_bit(IEEE80211_STA_REQ_AUTH, &ifsta->request)) {
2255 if (ieee80211_sta_config_auth(sdata, ifsta))
2257 clear_bit(IEEE80211_STA_REQ_RUN, &ifsta->request);
2258 } else if (!test_and_clear_bit(IEEE80211_STA_REQ_RUN, &ifsta->request))
2261 switch (ifsta->state) {
2262 case IEEE80211_STA_MLME_DISABLED:
2264 case IEEE80211_STA_MLME_DIRECT_PROBE:
2265 ieee80211_direct_probe(sdata, ifsta);
2267 case IEEE80211_STA_MLME_AUTHENTICATE:
2268 ieee80211_authenticate(sdata, ifsta);
2270 case IEEE80211_STA_MLME_ASSOCIATE:
2271 ieee80211_associate(sdata, ifsta);
2273 case IEEE80211_STA_MLME_ASSOCIATED:
2274 ieee80211_associated(sdata, ifsta);
2276 case IEEE80211_STA_MLME_IBSS_SEARCH:
2277 ieee80211_sta_find_ibss(sdata, ifsta);
2279 case IEEE80211_STA_MLME_IBSS_JOINED:
2280 ieee80211_sta_merge_ibss(sdata, ifsta);
2287 if (ieee80211_privacy_mismatch(sdata, ifsta)) {
2288 printk(KERN_DEBUG "%s: privacy configuration mismatch and "
2289 "mixed-cell disabled - disassociate\n", sdata->dev->name);
2291 ieee80211_set_disassoc(sdata, ifsta, false, true,
2292 WLAN_REASON_UNSPECIFIED);
2296 static void ieee80211_restart_sta_timer(struct ieee80211_sub_if_data *sdata)
2298 if (sdata->vif.type == IEEE80211_IF_TYPE_STA)
2299 queue_work(sdata->local->hw.workqueue,
2300 &sdata->u.sta.work);
2303 /* interface setup */
2304 void ieee80211_sta_setup_sdata(struct ieee80211_sub_if_data *sdata)
2306 struct ieee80211_if_sta *ifsta;
2308 ifsta = &sdata->u.sta;
2309 INIT_WORK(&ifsta->work, ieee80211_sta_work);
2310 setup_timer(&ifsta->timer, ieee80211_sta_timer,
2311 (unsigned long) sdata);
2312 skb_queue_head_init(&ifsta->skb_queue);
2314 ifsta->capab = WLAN_CAPABILITY_ESS;
2315 ifsta->auth_algs = IEEE80211_AUTH_ALG_OPEN |
2316 IEEE80211_AUTH_ALG_SHARED_KEY;
2317 ifsta->flags |= IEEE80211_STA_CREATE_IBSS |
2318 IEEE80211_STA_AUTO_BSSID_SEL |
2319 IEEE80211_STA_AUTO_CHANNEL_SEL;
2320 if (ieee80211_num_regular_queues(&sdata->local->hw) >= 4)
2321 ifsta->flags |= IEEE80211_STA_WMM_ENABLED;
2325 * Add a new IBSS station, will also be called by the RX code when,
2326 * in IBSS mode, receiving a frame from a yet-unknown station, hence
2327 * must be callable in atomic context.
2329 struct sta_info *ieee80211_ibss_add_sta(struct ieee80211_sub_if_data *sdata,
2330 struct sk_buff *skb, u8 *bssid,
2331 u8 *addr, u64 supp_rates)
2333 struct ieee80211_local *local = sdata->local;
2334 struct sta_info *sta;
2335 DECLARE_MAC_BUF(mac);
2336 int band = local->hw.conf.channel->band;
2338 /* TODO: Could consider removing the least recently used entry and
2339 * allow new one to be added. */
2340 if (local->num_sta >= IEEE80211_IBSS_MAX_STA_ENTRIES) {
2341 if (net_ratelimit()) {
2342 printk(KERN_DEBUG "%s: No room for a new IBSS STA "
2343 "entry %s\n", sdata->dev->name, print_mac(mac, addr));
2348 if (compare_ether_addr(bssid, sdata->u.sta.bssid))
2351 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
2352 printk(KERN_DEBUG "%s: Adding new IBSS station %s (dev=%s)\n",
2353 wiphy_name(local->hw.wiphy), print_mac(mac, addr), sdata->dev->name);
2356 sta = sta_info_alloc(sdata, addr, GFP_ATOMIC);
2360 set_sta_flags(sta, WLAN_STA_AUTHORIZED);
2362 /* make sure mandatory rates are always added */
2363 sta->supp_rates[band] = supp_rates |
2364 ieee80211_sta_get_mandatory_rates(local, band);
2366 rate_control_rate_init(sta, local);
2368 if (sta_info_insert(sta))
2374 /* configuration hooks */
2375 void ieee80211_sta_req_auth(struct ieee80211_sub_if_data *sdata,
2376 struct ieee80211_if_sta *ifsta)
2378 struct ieee80211_local *local = sdata->local;
2380 if (sdata->vif.type != IEEE80211_IF_TYPE_STA)
2383 if ((ifsta->flags & (IEEE80211_STA_BSSID_SET |
2384 IEEE80211_STA_AUTO_BSSID_SEL)) &&
2385 (ifsta->flags & (IEEE80211_STA_SSID_SET |
2386 IEEE80211_STA_AUTO_SSID_SEL))) {
2388 if (ifsta->state == IEEE80211_STA_MLME_ASSOCIATED)
2389 ieee80211_set_disassoc(sdata, ifsta, true, true,
2390 WLAN_REASON_DEAUTH_LEAVING);
2392 set_bit(IEEE80211_STA_REQ_AUTH, &ifsta->request);
2393 queue_work(local->hw.workqueue, &ifsta->work);
2397 int ieee80211_sta_set_ssid(struct ieee80211_sub_if_data *sdata, char *ssid, size_t len)
2399 struct ieee80211_if_sta *ifsta;
2402 if (len > IEEE80211_MAX_SSID_LEN)
2405 ifsta = &sdata->u.sta;
2407 if (ifsta->ssid_len != len || memcmp(ifsta->ssid, ssid, len) != 0) {
2408 memset(ifsta->ssid, 0, sizeof(ifsta->ssid));
2409 memcpy(ifsta->ssid, ssid, len);
2410 ifsta->ssid_len = len;
2411 ifsta->flags &= ~IEEE80211_STA_PREV_BSSID_SET;
2415 * Hack! MLME code needs to be cleaned up to have different
2416 * entry points for configuration and internal selection change
2418 if (netif_running(sdata->dev))
2419 res = ieee80211_if_config(sdata, IEEE80211_IFCC_SSID);
2421 printk(KERN_DEBUG "%s: Failed to config new SSID to "
2422 "the low-level driver\n", sdata->dev->name);
2428 ifsta->flags |= IEEE80211_STA_SSID_SET;
2430 ifsta->flags &= ~IEEE80211_STA_SSID_SET;
2432 if (sdata->vif.type == IEEE80211_IF_TYPE_IBSS &&
2433 !(ifsta->flags & IEEE80211_STA_BSSID_SET)) {
2434 ifsta->ibss_join_req = jiffies;
2435 ifsta->state = IEEE80211_STA_MLME_IBSS_SEARCH;
2436 return ieee80211_sta_find_ibss(sdata, ifsta);
2442 int ieee80211_sta_get_ssid(struct ieee80211_sub_if_data *sdata, char *ssid, size_t *len)
2444 struct ieee80211_if_sta *ifsta = &sdata->u.sta;
2445 memcpy(ssid, ifsta->ssid, ifsta->ssid_len);
2446 *len = ifsta->ssid_len;
2450 int ieee80211_sta_set_bssid(struct ieee80211_sub_if_data *sdata, u8 *bssid)
2452 struct ieee80211_if_sta *ifsta;
2455 ifsta = &sdata->u.sta;
2457 if (memcmp(ifsta->bssid, bssid, ETH_ALEN) != 0) {
2458 memcpy(ifsta->bssid, bssid, ETH_ALEN);
2461 * Hack! See also ieee80211_sta_set_ssid.
2463 if (netif_running(sdata->dev))
2464 res = ieee80211_if_config(sdata, IEEE80211_IFCC_BSSID);
2466 printk(KERN_DEBUG "%s: Failed to config new BSSID to "
2467 "the low-level driver\n", sdata->dev->name);
2472 if (is_valid_ether_addr(bssid))
2473 ifsta->flags |= IEEE80211_STA_BSSID_SET;
2475 ifsta->flags &= ~IEEE80211_STA_BSSID_SET;
2480 int ieee80211_sta_set_extra_ie(struct ieee80211_sub_if_data *sdata, char *ie, size_t len)
2482 struct ieee80211_if_sta *ifsta = &sdata->u.sta;
2484 kfree(ifsta->extra_ie);
2486 ifsta->extra_ie = NULL;
2487 ifsta->extra_ie_len = 0;
2490 ifsta->extra_ie = kmalloc(len, GFP_KERNEL);
2491 if (!ifsta->extra_ie) {
2492 ifsta->extra_ie_len = 0;
2495 memcpy(ifsta->extra_ie, ie, len);
2496 ifsta->extra_ie_len = len;
2500 int ieee80211_sta_deauthenticate(struct ieee80211_sub_if_data *sdata, u16 reason)
2502 struct ieee80211_if_sta *ifsta = &sdata->u.sta;
2504 printk(KERN_DEBUG "%s: deauthenticating by local choice (reason=%d)\n",
2505 sdata->dev->name, reason);
2507 if (sdata->vif.type != IEEE80211_IF_TYPE_STA &&
2508 sdata->vif.type != IEEE80211_IF_TYPE_IBSS)
2511 ieee80211_set_disassoc(sdata, ifsta, true, true, reason);
2515 int ieee80211_sta_disassociate(struct ieee80211_sub_if_data *sdata, u16 reason)
2517 struct ieee80211_if_sta *ifsta = &sdata->u.sta;
2519 printk(KERN_DEBUG "%s: disassociating by local choice (reason=%d)\n",
2520 sdata->dev->name, reason);
2522 if (sdata->vif.type != IEEE80211_IF_TYPE_STA)
2525 if (!(ifsta->flags & IEEE80211_STA_ASSOCIATED))
2528 ieee80211_set_disassoc(sdata, ifsta, false, true, reason);
2532 /* scan finished notification */
2533 void ieee80211_mlme_notify_scan_completed(struct ieee80211_local *local)
2535 struct ieee80211_sub_if_data *sdata = local->scan_sdata;
2536 struct ieee80211_if_sta *ifsta;
2538 if (sdata && sdata->vif.type == IEEE80211_IF_TYPE_IBSS) {
2539 ifsta = &sdata->u.sta;
2540 if (!(ifsta->flags & IEEE80211_STA_BSSID_SET) ||
2541 (!(ifsta->state == IEEE80211_STA_MLME_IBSS_JOINED) &&
2542 !ieee80211_sta_active_ibss(sdata)))
2543 ieee80211_sta_find_ibss(sdata, ifsta);
2546 /* Restart STA timers */
2548 list_for_each_entry_rcu(sdata, &local->interfaces, list)
2549 ieee80211_restart_sta_timer(sdata);
2553 /* driver notification call */
2554 void ieee80211_notify_mac(struct ieee80211_hw *hw,
2555 enum ieee80211_notification_types notif_type)
2557 struct ieee80211_local *local = hw_to_local(hw);
2558 struct ieee80211_sub_if_data *sdata;
2560 switch (notif_type) {
2561 case IEEE80211_NOTIFY_RE_ASSOC:
2563 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
2564 if (sdata->vif.type != IEEE80211_IF_TYPE_STA)
2567 ieee80211_sta_req_auth(sdata, &sdata->u.sta);
2573 EXPORT_SYMBOL(ieee80211_notify_mac);