2 * IBSS mode implementation
3 * Copyright 2003-2008, Jouni Malinen <j@w1.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>
8 * Copyright 2009, Johannes Berg <johannes@sipsolutions.net>
10 * This program is free software; you can redistribute it and/or modify
11 * it under the terms of the GNU General Public License version 2 as
12 * published by the Free Software Foundation.
15 #include <linux/delay.h>
16 #include <linux/if_ether.h>
17 #include <linux/skbuff.h>
18 #include <linux/if_arp.h>
19 #include <linux/etherdevice.h>
20 #include <linux/rtnetlink.h>
21 #include <net/mac80211.h>
22 #include <asm/unaligned.h>
24 #include "ieee80211_i.h"
25 #include "driver-ops.h"
28 #define IEEE80211_SCAN_INTERVAL (2 * HZ)
29 #define IEEE80211_SCAN_INTERVAL_SLOW (15 * HZ)
30 #define IEEE80211_IBSS_JOIN_TIMEOUT (7 * HZ)
32 #define IEEE80211_IBSS_MERGE_INTERVAL (30 * HZ)
33 #define IEEE80211_IBSS_MERGE_DELAY 0x400000
34 #define IEEE80211_IBSS_INACTIVITY_LIMIT (60 * HZ)
36 #define IEEE80211_IBSS_MAX_STA_ENTRIES 128
39 static void ieee80211_rx_mgmt_auth_ibss(struct ieee80211_sub_if_data *sdata,
40 struct ieee80211_mgmt *mgmt,
43 u16 auth_alg, auth_transaction, status_code;
48 auth_alg = le16_to_cpu(mgmt->u.auth.auth_alg);
49 auth_transaction = le16_to_cpu(mgmt->u.auth.auth_transaction);
50 status_code = le16_to_cpu(mgmt->u.auth.status_code);
53 * IEEE 802.11 standard does not require authentication in IBSS
54 * networks and most implementations do not seem to use it.
55 * However, try to reply to authentication attempts if someone
56 * has actually implemented this.
58 if (auth_alg == WLAN_AUTH_OPEN && auth_transaction == 1)
59 ieee80211_send_auth(sdata, 2, WLAN_AUTH_OPEN, NULL, 0,
60 sdata->u.ibss.bssid, NULL, 0, 0);
63 static void __ieee80211_sta_join_ibss(struct ieee80211_sub_if_data *sdata,
64 const u8 *bssid, const int beacon_int,
65 struct ieee80211_channel *chan,
66 const u32 basic_rates,
67 const u16 capability, u64 tsf)
69 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
70 struct ieee80211_local *local = sdata->local;
73 struct ieee80211_mgmt *mgmt;
75 struct ieee80211_supported_band *sband;
76 struct cfg80211_bss *bss;
78 u8 supp_rates[IEEE80211_MAX_SUPP_RATES];
80 /* Reset own TSF to allow time synchronization work. */
84 rcu_assign_pointer(ifibss->presp, NULL);
86 skb->data = skb->head;
88 skb_reset_tail_pointer(skb);
89 skb_reserve(skb, sdata->local->hw.extra_tx_headroom);
91 if (memcmp(ifibss->bssid, bssid, ETH_ALEN))
92 sta_info_flush(sdata->local, sdata);
94 memcpy(ifibss->bssid, bssid, ETH_ALEN);
96 sdata->drop_unencrypted = capability & WLAN_CAPABILITY_PRIVACY ? 1 : 0;
98 local->oper_channel = chan;
99 local->oper_channel_type = NL80211_CHAN_NO_HT;
100 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_CHANNEL);
102 sband = local->hw.wiphy->bands[chan->band];
104 /* build supported rates array */
106 for (i = 0; i < sband->n_bitrates; i++) {
107 int rate = sband->bitrates[i].bitrate;
109 if (basic_rates & BIT(i))
111 *pos++ = basic | (u8) (rate / 5);
114 /* Build IBSS probe response */
115 mgmt = (void *) skb_put(skb, 24 + sizeof(mgmt->u.beacon));
116 memset(mgmt, 0, 24 + sizeof(mgmt->u.beacon));
117 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
118 IEEE80211_STYPE_PROBE_RESP);
119 memset(mgmt->da, 0xff, ETH_ALEN);
120 memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
121 memcpy(mgmt->bssid, ifibss->bssid, ETH_ALEN);
122 mgmt->u.beacon.beacon_int = cpu_to_le16(beacon_int);
123 mgmt->u.beacon.timestamp = cpu_to_le64(tsf);
124 mgmt->u.beacon.capab_info = cpu_to_le16(capability);
126 pos = skb_put(skb, 2 + ifibss->ssid_len);
127 *pos++ = WLAN_EID_SSID;
128 *pos++ = ifibss->ssid_len;
129 memcpy(pos, ifibss->ssid, ifibss->ssid_len);
131 rates = sband->n_bitrates;
134 pos = skb_put(skb, 2 + rates);
135 *pos++ = WLAN_EID_SUPP_RATES;
137 memcpy(pos, supp_rates, rates);
139 if (sband->band == IEEE80211_BAND_2GHZ) {
140 pos = skb_put(skb, 2 + 1);
141 *pos++ = WLAN_EID_DS_PARAMS;
143 *pos++ = ieee80211_frequency_to_channel(chan->center_freq);
146 pos = skb_put(skb, 2 + 2);
147 *pos++ = WLAN_EID_IBSS_PARAMS;
149 /* FIX: set ATIM window based on scan results */
153 if (sband->n_bitrates > 8) {
154 rates = sband->n_bitrates - 8;
155 pos = skb_put(skb, 2 + rates);
156 *pos++ = WLAN_EID_EXT_SUPP_RATES;
158 memcpy(pos, &supp_rates[8], rates);
162 memcpy(skb_put(skb, ifibss->ie_len),
163 ifibss->ie, ifibss->ie_len);
165 rcu_assign_pointer(ifibss->presp, skb);
167 sdata->vif.bss_conf.beacon_int = beacon_int;
168 bss_change = BSS_CHANGED_BEACON_INT;
169 bss_change |= ieee80211_reset_erp_info(sdata);
170 bss_change |= BSS_CHANGED_BSSID;
171 bss_change |= BSS_CHANGED_BEACON;
172 bss_change |= BSS_CHANGED_BEACON_ENABLED;
173 ieee80211_bss_info_change_notify(sdata, bss_change);
175 ieee80211_sta_def_wmm_params(sdata, sband->n_bitrates, supp_rates);
177 ifibss->state = IEEE80211_IBSS_MLME_JOINED;
178 mod_timer(&ifibss->timer,
179 round_jiffies(jiffies + IEEE80211_IBSS_MERGE_INTERVAL));
181 bss = cfg80211_inform_bss_frame(local->hw.wiphy, local->hw.conf.channel,
182 mgmt, skb->len, 0, GFP_KERNEL);
183 cfg80211_put_bss(bss);
184 cfg80211_ibss_joined(sdata->dev, ifibss->bssid, GFP_KERNEL);
187 static void ieee80211_sta_join_ibss(struct ieee80211_sub_if_data *sdata,
188 struct ieee80211_bss *bss)
190 struct cfg80211_bss *cbss =
191 container_of((void *)bss, struct cfg80211_bss, priv);
192 struct ieee80211_supported_band *sband;
195 u16 beacon_int = cbss->beacon_interval;
200 sband = sdata->local->hw.wiphy->bands[cbss->channel->band];
204 for (i = 0; i < bss->supp_rates_len; i++) {
205 int rate = (bss->supp_rates[i] & 0x7f) * 5;
206 bool is_basic = !!(bss->supp_rates[i] & 0x80);
208 for (j = 0; j < sband->n_bitrates; j++) {
209 if (sband->bitrates[j].bitrate == rate) {
211 basic_rates |= BIT(j);
217 __ieee80211_sta_join_ibss(sdata, cbss->bssid,
225 static void ieee80211_rx_bss_info(struct ieee80211_sub_if_data *sdata,
226 struct ieee80211_mgmt *mgmt,
228 struct ieee80211_rx_status *rx_status,
229 struct ieee802_11_elems *elems,
232 struct ieee80211_local *local = sdata->local;
234 struct cfg80211_bss *cbss;
235 struct ieee80211_bss *bss;
236 struct sta_info *sta;
237 struct ieee80211_channel *channel;
238 u64 beacon_timestamp, rx_timestamp;
240 enum ieee80211_band band = rx_status->band;
242 if (elems->ds_params && elems->ds_params_len == 1)
243 freq = ieee80211_channel_to_frequency(elems->ds_params[0]);
245 freq = rx_status->freq;
247 channel = ieee80211_get_channel(local->hw.wiphy, freq);
249 if (!channel || channel->flags & IEEE80211_CHAN_DISABLED)
252 if (sdata->vif.type == NL80211_IFTYPE_ADHOC && elems->supp_rates &&
253 memcmp(mgmt->bssid, sdata->u.ibss.bssid, ETH_ALEN) == 0) {
254 supp_rates = ieee80211_sta_get_rates(local, elems, band);
258 sta = sta_info_get(sdata, mgmt->sa);
262 prev_rates = sta->sta.supp_rates[band];
263 /* make sure mandatory rates are always added */
264 sta->sta.supp_rates[band] = supp_rates |
265 ieee80211_mandatory_rates(local, band);
267 #ifdef CONFIG_MAC80211_IBSS_DEBUG
268 if (sta->sta.supp_rates[band] != prev_rates)
269 printk(KERN_DEBUG "%s: updated supp_rates set "
270 "for %pM based on beacon info (0x%llx | "
271 "0x%llx -> 0x%llx)\n",
274 (unsigned long long) prev_rates,
275 (unsigned long long) supp_rates,
276 (unsigned long long) sta->sta.supp_rates[band]);
279 ieee80211_ibss_add_sta(sdata, mgmt->bssid, mgmt->sa, supp_rates);
284 bss = ieee80211_bss_info_update(local, rx_status, mgmt, len, elems,
289 cbss = container_of((void *)bss, struct cfg80211_bss, priv);
291 /* was just updated in ieee80211_bss_info_update */
292 beacon_timestamp = cbss->tsf;
294 /* check if we need to merge IBSS */
296 /* we use a fixed BSSID */
297 if (sdata->u.ibss.fixed_bssid)
301 if (!(cbss->capability & WLAN_CAPABILITY_IBSS))
304 /* different channel */
305 if (cbss->channel != local->oper_channel)
309 if (elems->ssid_len != sdata->u.ibss.ssid_len ||
310 memcmp(elems->ssid, sdata->u.ibss.ssid,
311 sdata->u.ibss.ssid_len))
315 if (memcmp(cbss->bssid, sdata->u.ibss.bssid, ETH_ALEN) == 0)
318 if (rx_status->flag & RX_FLAG_TSFT) {
320 * For correct IBSS merging we need mactime; since mactime is
321 * defined as the time the first data symbol of the frame hits
322 * the PHY, and the timestamp of the beacon is defined as "the
323 * time that the data symbol containing the first bit of the
324 * timestamp is transmitted to the PHY plus the transmitting
325 * STA's delays through its local PHY from the MAC-PHY
326 * interface to its interface with the WM" (802.11 11.1.2)
327 * - equals the time this bit arrives at the receiver - we have
328 * to take into account the offset between the two.
330 * E.g. at 1 MBit that means mactime is 192 usec earlier
331 * (=24 bytes * 8 usecs/byte) than the beacon timestamp.
335 if (rx_status->flag & RX_FLAG_HT)
336 rate = 65; /* TODO: HT rates */
338 rate = local->hw.wiphy->bands[band]->
339 bitrates[rx_status->rate_idx].bitrate;
341 rx_timestamp = rx_status->mactime + (24 * 8 * 10 / rate);
344 * second best option: get current TSF
345 * (will return -1 if not supported)
347 rx_timestamp = drv_get_tsf(local);
350 #ifdef CONFIG_MAC80211_IBSS_DEBUG
351 printk(KERN_DEBUG "RX beacon SA=%pM BSSID="
352 "%pM TSF=0x%llx BCN=0x%llx diff=%lld @%lu\n",
353 mgmt->sa, mgmt->bssid,
354 (unsigned long long)rx_timestamp,
355 (unsigned long long)beacon_timestamp,
356 (unsigned long long)(rx_timestamp - beacon_timestamp),
360 /* give slow hardware some time to do the TSF sync */
361 if (rx_timestamp < IEEE80211_IBSS_MERGE_DELAY)
364 if (beacon_timestamp > rx_timestamp) {
365 #ifdef CONFIG_MAC80211_IBSS_DEBUG
366 printk(KERN_DEBUG "%s: beacon TSF higher than "
367 "local TSF - IBSS merge with BSSID %pM\n",
368 sdata->name, mgmt->bssid);
370 ieee80211_sta_join_ibss(sdata, bss);
371 ieee80211_ibss_add_sta(sdata, mgmt->bssid, mgmt->sa, supp_rates);
375 ieee80211_rx_bss_put(local, bss);
379 * Add a new IBSS station, will also be called by the RX code when,
380 * in IBSS mode, receiving a frame from a yet-unknown station, hence
381 * must be callable in atomic context.
383 struct sta_info *ieee80211_ibss_add_sta(struct ieee80211_sub_if_data *sdata,
384 u8 *bssid,u8 *addr, u32 supp_rates)
386 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
387 struct ieee80211_local *local = sdata->local;
388 struct sta_info *sta;
389 int band = local->hw.conf.channel->band;
392 * XXX: Consider removing the least recently used entry and
393 * allow new one to be added.
395 if (local->num_sta >= IEEE80211_IBSS_MAX_STA_ENTRIES) {
397 printk(KERN_DEBUG "%s: No room for a new IBSS STA entry %pM\n",
402 if (ifibss->state == IEEE80211_IBSS_MLME_SEARCH)
405 if (compare_ether_addr(bssid, sdata->u.ibss.bssid))
408 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
409 printk(KERN_DEBUG "%s: Adding new IBSS station %pM (dev=%s)\n",
410 wiphy_name(local->hw.wiphy), addr, sdata->name);
413 sta = sta_info_alloc(sdata, addr, GFP_ATOMIC);
417 set_sta_flags(sta, WLAN_STA_AUTHORIZED);
419 /* make sure mandatory rates are always added */
420 sta->sta.supp_rates[band] = supp_rates |
421 ieee80211_mandatory_rates(local, band);
423 rate_control_rate_init(sta);
425 if (sta_info_insert(sta))
431 static int ieee80211_sta_active_ibss(struct ieee80211_sub_if_data *sdata)
433 struct ieee80211_local *local = sdata->local;
435 struct sta_info *sta;
439 list_for_each_entry_rcu(sta, &local->sta_list, list) {
440 if (sta->sdata == sdata &&
441 time_after(sta->last_rx + IEEE80211_IBSS_MERGE_INTERVAL,
454 * This function is called with state == IEEE80211_IBSS_MLME_JOINED
457 static void ieee80211_sta_merge_ibss(struct ieee80211_sub_if_data *sdata)
459 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
461 mod_timer(&ifibss->timer,
462 round_jiffies(jiffies + IEEE80211_IBSS_MERGE_INTERVAL));
464 ieee80211_sta_expire(sdata, IEEE80211_IBSS_INACTIVITY_LIMIT);
466 if (time_before(jiffies, ifibss->last_scan_completed +
467 IEEE80211_IBSS_MERGE_INTERVAL))
470 if (ieee80211_sta_active_ibss(sdata))
473 if (ifibss->fixed_channel)
476 printk(KERN_DEBUG "%s: No active IBSS STAs - trying to scan for other "
477 "IBSS networks with same SSID (merge)\n", sdata->name);
479 ieee80211_request_internal_scan(sdata, ifibss->ssid, ifibss->ssid_len);
482 static void ieee80211_sta_create_ibss(struct ieee80211_sub_if_data *sdata)
484 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
485 struct ieee80211_local *local = sdata->local;
486 struct ieee80211_supported_band *sband;
491 if (ifibss->fixed_bssid) {
492 memcpy(bssid, ifibss->bssid, ETH_ALEN);
494 /* Generate random, not broadcast, locally administered BSSID. Mix in
495 * own MAC address to make sure that devices that do not have proper
496 * random number generator get different BSSID. */
497 get_random_bytes(bssid, ETH_ALEN);
498 for (i = 0; i < ETH_ALEN; i++)
499 bssid[i] ^= sdata->vif.addr[i];
504 printk(KERN_DEBUG "%s: Creating new IBSS network, BSSID %pM\n",
507 sband = local->hw.wiphy->bands[ifibss->channel->band];
509 capability = WLAN_CAPABILITY_IBSS;
512 capability |= WLAN_CAPABILITY_PRIVACY;
514 sdata->drop_unencrypted = 0;
516 __ieee80211_sta_join_ibss(sdata, bssid, sdata->vif.bss_conf.beacon_int,
517 ifibss->channel, 3, /* first two are basic */
522 * This function is called with state == IEEE80211_IBSS_MLME_SEARCH
525 static void ieee80211_sta_find_ibss(struct ieee80211_sub_if_data *sdata)
527 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
528 struct ieee80211_local *local = sdata->local;
529 struct cfg80211_bss *cbss;
530 struct ieee80211_channel *chan = NULL;
531 const u8 *bssid = NULL;
535 active_ibss = ieee80211_sta_active_ibss(sdata);
536 #ifdef CONFIG_MAC80211_IBSS_DEBUG
537 printk(KERN_DEBUG "%s: sta_find_ibss (active_ibss=%d)\n",
538 sdata->name, active_ibss);
539 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
544 capability = WLAN_CAPABILITY_IBSS;
546 capability |= WLAN_CAPABILITY_PRIVACY;
547 if (ifibss->fixed_bssid)
548 bssid = ifibss->bssid;
549 if (ifibss->fixed_channel)
550 chan = ifibss->channel;
551 if (!is_zero_ether_addr(ifibss->bssid))
552 bssid = ifibss->bssid;
553 cbss = cfg80211_get_bss(local->hw.wiphy, chan, bssid,
554 ifibss->ssid, ifibss->ssid_len,
555 WLAN_CAPABILITY_IBSS | WLAN_CAPABILITY_PRIVACY,
559 struct ieee80211_bss *bss;
561 bss = (void *)cbss->priv;
562 #ifdef CONFIG_MAC80211_IBSS_DEBUG
563 printk(KERN_DEBUG " sta_find_ibss: selected %pM current "
564 "%pM\n", cbss->bssid, ifibss->bssid);
565 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
567 printk(KERN_DEBUG "%s: Selected IBSS BSSID %pM"
568 " based on configured SSID\n",
569 sdata->name, cbss->bssid);
571 ieee80211_sta_join_ibss(sdata, bss);
572 ieee80211_rx_bss_put(local, bss);
576 #ifdef CONFIG_MAC80211_IBSS_DEBUG
577 printk(KERN_DEBUG " did not try to join ibss\n");
578 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
580 /* Selected IBSS not found in current scan results - try to scan */
581 if (time_after(jiffies, ifibss->last_scan_completed +
582 IEEE80211_SCAN_INTERVAL)) {
583 printk(KERN_DEBUG "%s: Trigger new scan to find an IBSS to "
584 "join\n", sdata->name);
586 ieee80211_request_internal_scan(sdata, ifibss->ssid,
589 int interval = IEEE80211_SCAN_INTERVAL;
591 if (time_after(jiffies, ifibss->ibss_join_req +
592 IEEE80211_IBSS_JOIN_TIMEOUT)) {
593 if (!(local->oper_channel->flags & IEEE80211_CHAN_NO_IBSS)) {
594 ieee80211_sta_create_ibss(sdata);
597 printk(KERN_DEBUG "%s: IBSS not allowed on"
598 " %d MHz\n", sdata->name,
599 local->hw.conf.channel->center_freq);
601 /* No IBSS found - decrease scan interval and continue
603 interval = IEEE80211_SCAN_INTERVAL_SLOW;
606 mod_timer(&ifibss->timer,
607 round_jiffies(jiffies + interval));
611 static void ieee80211_rx_mgmt_probe_req(struct ieee80211_sub_if_data *sdata,
612 struct ieee80211_mgmt *mgmt,
615 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
616 struct ieee80211_local *local = sdata->local;
619 struct ieee80211_mgmt *resp;
622 if (ifibss->state != IEEE80211_IBSS_MLME_JOINED ||
623 len < 24 + 2 || !ifibss->presp)
626 tx_last_beacon = drv_tx_last_beacon(local);
628 #ifdef CONFIG_MAC80211_IBSS_DEBUG
629 printk(KERN_DEBUG "%s: RX ProbeReq SA=%pM DA=%pM BSSID=%pM"
630 " (tx_last_beacon=%d)\n",
631 sdata->name, mgmt->sa, mgmt->da,
632 mgmt->bssid, tx_last_beacon);
633 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
638 if (memcmp(mgmt->bssid, ifibss->bssid, ETH_ALEN) != 0 &&
639 memcmp(mgmt->bssid, "\xff\xff\xff\xff\xff\xff", ETH_ALEN) != 0)
642 end = ((u8 *) mgmt) + len;
643 pos = mgmt->u.probe_req.variable;
644 if (pos[0] != WLAN_EID_SSID ||
645 pos + 2 + pos[1] > end) {
646 #ifdef CONFIG_MAC80211_IBSS_DEBUG
647 printk(KERN_DEBUG "%s: Invalid SSID IE in ProbeReq "
649 sdata->name, mgmt->sa);
654 (pos[1] != ifibss->ssid_len ||
655 !memcmp(pos + 2, ifibss->ssid, ifibss->ssid_len))) {
656 /* Ignore ProbeReq for foreign SSID */
660 /* Reply with ProbeResp */
661 skb = skb_copy(ifibss->presp, GFP_KERNEL);
665 resp = (struct ieee80211_mgmt *) skb->data;
666 memcpy(resp->da, mgmt->sa, ETH_ALEN);
667 #ifdef CONFIG_MAC80211_IBSS_DEBUG
668 printk(KERN_DEBUG "%s: Sending ProbeResp to %pM\n",
669 sdata->name, resp->da);
670 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
671 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
672 ieee80211_tx_skb(sdata, skb);
675 static void ieee80211_rx_mgmt_probe_resp(struct ieee80211_sub_if_data *sdata,
676 struct ieee80211_mgmt *mgmt,
678 struct ieee80211_rx_status *rx_status)
681 struct ieee802_11_elems elems;
683 if (memcmp(mgmt->da, sdata->vif.addr, ETH_ALEN))
684 return; /* ignore ProbeResp to foreign address */
686 baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt;
690 ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen,
693 ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems, false);
696 static void ieee80211_rx_mgmt_beacon(struct ieee80211_sub_if_data *sdata,
697 struct ieee80211_mgmt *mgmt,
699 struct ieee80211_rx_status *rx_status)
702 struct ieee802_11_elems elems;
704 /* Process beacon from the current BSS */
705 baselen = (u8 *) mgmt->u.beacon.variable - (u8 *) mgmt;
709 ieee802_11_parse_elems(mgmt->u.beacon.variable, len - baselen, &elems);
711 ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems, true);
714 static void ieee80211_ibss_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata,
717 struct ieee80211_rx_status *rx_status;
718 struct ieee80211_mgmt *mgmt;
721 rx_status = IEEE80211_SKB_RXCB(skb);
722 mgmt = (struct ieee80211_mgmt *) skb->data;
723 fc = le16_to_cpu(mgmt->frame_control);
725 switch (fc & IEEE80211_FCTL_STYPE) {
726 case IEEE80211_STYPE_PROBE_REQ:
727 ieee80211_rx_mgmt_probe_req(sdata, mgmt, skb->len);
729 case IEEE80211_STYPE_PROBE_RESP:
730 ieee80211_rx_mgmt_probe_resp(sdata, mgmt, skb->len,
733 case IEEE80211_STYPE_BEACON:
734 ieee80211_rx_mgmt_beacon(sdata, mgmt, skb->len,
737 case IEEE80211_STYPE_AUTH:
738 ieee80211_rx_mgmt_auth_ibss(sdata, mgmt, skb->len);
745 static void ieee80211_ibss_work(struct work_struct *work)
747 struct ieee80211_sub_if_data *sdata =
748 container_of(work, struct ieee80211_sub_if_data, u.ibss.work);
749 struct ieee80211_local *local = sdata->local;
750 struct ieee80211_if_ibss *ifibss;
753 if (WARN_ON(local->suspended))
756 if (!ieee80211_sdata_running(sdata))
762 if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_ADHOC))
764 ifibss = &sdata->u.ibss;
766 while ((skb = skb_dequeue(&ifibss->skb_queue)))
767 ieee80211_ibss_rx_queued_mgmt(sdata, skb);
769 if (!test_and_clear_bit(IEEE80211_IBSS_REQ_RUN, &ifibss->request))
772 switch (ifibss->state) {
773 case IEEE80211_IBSS_MLME_SEARCH:
774 ieee80211_sta_find_ibss(sdata);
776 case IEEE80211_IBSS_MLME_JOINED:
777 ieee80211_sta_merge_ibss(sdata);
785 static void ieee80211_ibss_timer(unsigned long data)
787 struct ieee80211_sub_if_data *sdata =
788 (struct ieee80211_sub_if_data *) data;
789 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
790 struct ieee80211_local *local = sdata->local;
792 if (local->quiescing) {
793 ifibss->timer_running = true;
797 set_bit(IEEE80211_IBSS_REQ_RUN, &ifibss->request);
798 ieee80211_queue_work(&local->hw, &ifibss->work);
802 void ieee80211_ibss_quiesce(struct ieee80211_sub_if_data *sdata)
804 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
806 cancel_work_sync(&ifibss->work);
807 if (del_timer_sync(&ifibss->timer))
808 ifibss->timer_running = true;
811 void ieee80211_ibss_restart(struct ieee80211_sub_if_data *sdata)
813 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
815 if (ifibss->timer_running) {
816 add_timer(&ifibss->timer);
817 ifibss->timer_running = false;
822 void ieee80211_ibss_setup_sdata(struct ieee80211_sub_if_data *sdata)
824 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
826 INIT_WORK(&ifibss->work, ieee80211_ibss_work);
827 setup_timer(&ifibss->timer, ieee80211_ibss_timer,
828 (unsigned long) sdata);
829 skb_queue_head_init(&ifibss->skb_queue);
832 /* scan finished notification */
833 void ieee80211_ibss_notify_scan_completed(struct ieee80211_local *local)
835 struct ieee80211_sub_if_data *sdata;
837 mutex_lock(&local->iflist_mtx);
838 list_for_each_entry(sdata, &local->interfaces, list) {
839 if (!ieee80211_sdata_running(sdata))
841 if (sdata->vif.type != NL80211_IFTYPE_ADHOC)
843 if (!sdata->u.ibss.ssid_len)
845 sdata->u.ibss.last_scan_completed = jiffies;
846 mod_timer(&sdata->u.ibss.timer, 0);
848 mutex_unlock(&local->iflist_mtx);
852 ieee80211_ibss_rx_mgmt(struct ieee80211_sub_if_data *sdata, struct sk_buff *skb)
854 struct ieee80211_local *local = sdata->local;
855 struct ieee80211_mgmt *mgmt;
859 return RX_DROP_MONITOR;
861 mgmt = (struct ieee80211_mgmt *) skb->data;
862 fc = le16_to_cpu(mgmt->frame_control);
864 switch (fc & IEEE80211_FCTL_STYPE) {
865 case IEEE80211_STYPE_PROBE_RESP:
866 case IEEE80211_STYPE_BEACON:
867 case IEEE80211_STYPE_PROBE_REQ:
868 case IEEE80211_STYPE_AUTH:
869 skb_queue_tail(&sdata->u.ibss.skb_queue, skb);
870 ieee80211_queue_work(&local->hw, &sdata->u.ibss.work);
874 return RX_DROP_MONITOR;
877 int ieee80211_ibss_join(struct ieee80211_sub_if_data *sdata,
878 struct cfg80211_ibss_params *params)
883 memcpy(sdata->u.ibss.bssid, params->bssid, ETH_ALEN);
884 sdata->u.ibss.fixed_bssid = true;
886 sdata->u.ibss.fixed_bssid = false;
888 sdata->u.ibss.privacy = params->privacy;
890 sdata->vif.bss_conf.beacon_int = params->beacon_interval;
892 sdata->u.ibss.channel = params->channel;
893 sdata->u.ibss.fixed_channel = params->channel_fixed;
896 sdata->u.ibss.ie = kmemdup(params->ie, params->ie_len,
898 if (sdata->u.ibss.ie)
899 sdata->u.ibss.ie_len = params->ie_len;
902 skb = dev_alloc_skb(sdata->local->hw.extra_tx_headroom +
906 4 /* IBSS params */ +
911 sdata->u.ibss.skb = skb;
912 sdata->u.ibss.state = IEEE80211_IBSS_MLME_SEARCH;
913 sdata->u.ibss.ibss_join_req = jiffies;
915 memcpy(sdata->u.ibss.ssid, params->ssid, IEEE80211_MAX_SSID_LEN);
918 * The ssid_len setting below is used to see whether
919 * we are active, and we need all other settings
920 * before that may get visible.
924 sdata->u.ibss.ssid_len = params->ssid_len;
926 ieee80211_recalc_idle(sdata->local);
928 set_bit(IEEE80211_IBSS_REQ_RUN, &sdata->u.ibss.request);
929 ieee80211_queue_work(&sdata->local->hw, &sdata->u.ibss.work);
934 int ieee80211_ibss_leave(struct ieee80211_sub_if_data *sdata)
938 del_timer_sync(&sdata->u.ibss.timer);
939 clear_bit(IEEE80211_IBSS_REQ_RUN, &sdata->u.ibss.request);
940 cancel_work_sync(&sdata->u.ibss.work);
941 clear_bit(IEEE80211_IBSS_REQ_RUN, &sdata->u.ibss.request);
943 sta_info_flush(sdata->local, sdata);
946 kfree(sdata->u.ibss.ie);
947 skb = sdata->u.ibss.presp;
948 rcu_assign_pointer(sdata->u.ibss.presp, NULL);
949 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BEACON_ENABLED);
953 skb_queue_purge(&sdata->u.ibss.skb_queue);
954 memset(sdata->u.ibss.bssid, 0, ETH_ALEN);
955 sdata->u.ibss.ssid_len = 0;
957 ieee80211_recalc_idle(sdata->local);