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 /* if merging, indicate to driver that we leave the old IBSS */
95 if (sdata->vif.bss_conf.ibss_joined) {
96 sdata->vif.bss_conf.ibss_joined = false;
97 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_IBSS);
100 memcpy(ifibss->bssid, bssid, ETH_ALEN);
102 sdata->drop_unencrypted = capability & WLAN_CAPABILITY_PRIVACY ? 1 : 0;
104 local->oper_channel = chan;
105 local->oper_channel_type = NL80211_CHAN_NO_HT;
106 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_CHANNEL);
108 sband = local->hw.wiphy->bands[chan->band];
110 /* build supported rates array */
112 for (i = 0; i < sband->n_bitrates; i++) {
113 int rate = sband->bitrates[i].bitrate;
115 if (basic_rates & BIT(i))
117 *pos++ = basic | (u8) (rate / 5);
120 /* Build IBSS probe response */
121 mgmt = (void *) skb_put(skb, 24 + sizeof(mgmt->u.beacon));
122 memset(mgmt, 0, 24 + sizeof(mgmt->u.beacon));
123 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
124 IEEE80211_STYPE_PROBE_RESP);
125 memset(mgmt->da, 0xff, ETH_ALEN);
126 memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
127 memcpy(mgmt->bssid, ifibss->bssid, ETH_ALEN);
128 mgmt->u.beacon.beacon_int = cpu_to_le16(beacon_int);
129 mgmt->u.beacon.timestamp = cpu_to_le64(tsf);
130 mgmt->u.beacon.capab_info = cpu_to_le16(capability);
132 pos = skb_put(skb, 2 + ifibss->ssid_len);
133 *pos++ = WLAN_EID_SSID;
134 *pos++ = ifibss->ssid_len;
135 memcpy(pos, ifibss->ssid, ifibss->ssid_len);
137 rates = sband->n_bitrates;
140 pos = skb_put(skb, 2 + rates);
141 *pos++ = WLAN_EID_SUPP_RATES;
143 memcpy(pos, supp_rates, rates);
145 if (sband->band == IEEE80211_BAND_2GHZ) {
146 pos = skb_put(skb, 2 + 1);
147 *pos++ = WLAN_EID_DS_PARAMS;
149 *pos++ = ieee80211_frequency_to_channel(chan->center_freq);
152 pos = skb_put(skb, 2 + 2);
153 *pos++ = WLAN_EID_IBSS_PARAMS;
155 /* FIX: set ATIM window based on scan results */
159 if (sband->n_bitrates > 8) {
160 rates = sband->n_bitrates - 8;
161 pos = skb_put(skb, 2 + rates);
162 *pos++ = WLAN_EID_EXT_SUPP_RATES;
164 memcpy(pos, &supp_rates[8], rates);
168 memcpy(skb_put(skb, ifibss->ie_len),
169 ifibss->ie, ifibss->ie_len);
171 rcu_assign_pointer(ifibss->presp, skb);
173 sdata->vif.bss_conf.beacon_int = beacon_int;
174 bss_change = BSS_CHANGED_BEACON_INT;
175 bss_change |= ieee80211_reset_erp_info(sdata);
176 bss_change |= BSS_CHANGED_BSSID;
177 bss_change |= BSS_CHANGED_BEACON;
178 bss_change |= BSS_CHANGED_BEACON_ENABLED;
179 bss_change |= BSS_CHANGED_IBSS;
180 sdata->vif.bss_conf.ibss_joined = true;
181 ieee80211_bss_info_change_notify(sdata, bss_change);
183 ieee80211_sta_def_wmm_params(sdata, sband->n_bitrates, supp_rates);
185 ifibss->state = IEEE80211_IBSS_MLME_JOINED;
186 mod_timer(&ifibss->timer,
187 round_jiffies(jiffies + IEEE80211_IBSS_MERGE_INTERVAL));
189 bss = cfg80211_inform_bss_frame(local->hw.wiphy, local->hw.conf.channel,
190 mgmt, skb->len, 0, GFP_KERNEL);
191 cfg80211_put_bss(bss);
192 cfg80211_ibss_joined(sdata->dev, ifibss->bssid, GFP_KERNEL);
195 static void ieee80211_sta_join_ibss(struct ieee80211_sub_if_data *sdata,
196 struct ieee80211_bss *bss)
198 struct cfg80211_bss *cbss =
199 container_of((void *)bss, struct cfg80211_bss, priv);
200 struct ieee80211_supported_band *sband;
203 u16 beacon_int = cbss->beacon_interval;
208 sband = sdata->local->hw.wiphy->bands[cbss->channel->band];
212 for (i = 0; i < bss->supp_rates_len; i++) {
213 int rate = (bss->supp_rates[i] & 0x7f) * 5;
214 bool is_basic = !!(bss->supp_rates[i] & 0x80);
216 for (j = 0; j < sband->n_bitrates; j++) {
217 if (sband->bitrates[j].bitrate == rate) {
219 basic_rates |= BIT(j);
225 __ieee80211_sta_join_ibss(sdata, cbss->bssid,
233 static void ieee80211_rx_bss_info(struct ieee80211_sub_if_data *sdata,
234 struct ieee80211_mgmt *mgmt,
236 struct ieee80211_rx_status *rx_status,
237 struct ieee802_11_elems *elems,
240 struct ieee80211_local *local = sdata->local;
242 struct cfg80211_bss *cbss;
243 struct ieee80211_bss *bss;
244 struct sta_info *sta;
245 struct ieee80211_channel *channel;
246 u64 beacon_timestamp, rx_timestamp;
248 enum ieee80211_band band = rx_status->band;
250 if (elems->ds_params && elems->ds_params_len == 1)
251 freq = ieee80211_channel_to_frequency(elems->ds_params[0]);
253 freq = rx_status->freq;
255 channel = ieee80211_get_channel(local->hw.wiphy, freq);
257 if (!channel || channel->flags & IEEE80211_CHAN_DISABLED)
260 if (sdata->vif.type == NL80211_IFTYPE_ADHOC && elems->supp_rates &&
261 memcmp(mgmt->bssid, sdata->u.ibss.bssid, ETH_ALEN) == 0) {
262 supp_rates = ieee80211_sta_get_rates(local, elems, band);
266 sta = sta_info_get(sdata, mgmt->sa);
270 prev_rates = sta->sta.supp_rates[band];
271 /* make sure mandatory rates are always added */
272 sta->sta.supp_rates[band] = supp_rates |
273 ieee80211_mandatory_rates(local, band);
275 if (sta->sta.supp_rates[band] != prev_rates) {
276 #ifdef CONFIG_MAC80211_IBSS_DEBUG
277 printk(KERN_DEBUG "%s: updated supp_rates set "
278 "for %pM based on beacon/probe_response "
280 sdata->name, sta->sta.addr,
281 prev_rates, sta->sta.supp_rates[band]);
283 rate_control_rate_init(sta);
288 ieee80211_ibss_add_sta(sdata, mgmt->bssid, mgmt->sa,
289 supp_rates, GFP_KERNEL);
293 bss = ieee80211_bss_info_update(local, rx_status, mgmt, len, elems,
298 cbss = container_of((void *)bss, struct cfg80211_bss, priv);
300 /* was just updated in ieee80211_bss_info_update */
301 beacon_timestamp = cbss->tsf;
303 /* check if we need to merge IBSS */
305 /* we use a fixed BSSID */
306 if (sdata->u.ibss.fixed_bssid)
310 if (!(cbss->capability & WLAN_CAPABILITY_IBSS))
313 /* different channel */
314 if (cbss->channel != local->oper_channel)
318 if (elems->ssid_len != sdata->u.ibss.ssid_len ||
319 memcmp(elems->ssid, sdata->u.ibss.ssid,
320 sdata->u.ibss.ssid_len))
324 if (memcmp(cbss->bssid, sdata->u.ibss.bssid, ETH_ALEN) == 0)
327 if (rx_status->flag & RX_FLAG_TSFT) {
329 * For correct IBSS merging we need mactime; since mactime is
330 * defined as the time the first data symbol of the frame hits
331 * the PHY, and the timestamp of the beacon is defined as "the
332 * time that the data symbol containing the first bit of the
333 * timestamp is transmitted to the PHY plus the transmitting
334 * STA's delays through its local PHY from the MAC-PHY
335 * interface to its interface with the WM" (802.11 11.1.2)
336 * - equals the time this bit arrives at the receiver - we have
337 * to take into account the offset between the two.
339 * E.g. at 1 MBit that means mactime is 192 usec earlier
340 * (=24 bytes * 8 usecs/byte) than the beacon timestamp.
344 if (rx_status->flag & RX_FLAG_HT)
345 rate = 65; /* TODO: HT rates */
347 rate = local->hw.wiphy->bands[band]->
348 bitrates[rx_status->rate_idx].bitrate;
350 rx_timestamp = rx_status->mactime + (24 * 8 * 10 / rate);
353 * second best option: get current TSF
354 * (will return -1 if not supported)
356 rx_timestamp = drv_get_tsf(local);
359 #ifdef CONFIG_MAC80211_IBSS_DEBUG
360 printk(KERN_DEBUG "RX beacon SA=%pM BSSID="
361 "%pM TSF=0x%llx BCN=0x%llx diff=%lld @%lu\n",
362 mgmt->sa, mgmt->bssid,
363 (unsigned long long)rx_timestamp,
364 (unsigned long long)beacon_timestamp,
365 (unsigned long long)(rx_timestamp - beacon_timestamp),
369 /* give slow hardware some time to do the TSF sync */
370 if (rx_timestamp < IEEE80211_IBSS_MERGE_DELAY)
373 if (beacon_timestamp > rx_timestamp) {
374 #ifdef CONFIG_MAC80211_IBSS_DEBUG
375 printk(KERN_DEBUG "%s: beacon TSF higher than "
376 "local TSF - IBSS merge with BSSID %pM\n",
377 sdata->name, mgmt->bssid);
379 ieee80211_sta_join_ibss(sdata, bss);
380 supp_rates = ieee80211_sta_get_rates(local, elems, band);
381 ieee80211_ibss_add_sta(sdata, mgmt->bssid, mgmt->sa,
382 supp_rates, GFP_KERNEL);
386 ieee80211_rx_bss_put(local, bss);
390 * Add a new IBSS station, will also be called by the RX code when,
391 * in IBSS mode, receiving a frame from a yet-unknown station, hence
392 * must be callable in atomic context.
394 struct sta_info *ieee80211_ibss_add_sta(struct ieee80211_sub_if_data *sdata,
395 u8 *bssid,u8 *addr, u32 supp_rates,
398 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
399 struct ieee80211_local *local = sdata->local;
400 struct sta_info *sta;
401 int band = local->hw.conf.channel->band;
404 * XXX: Consider removing the least recently used entry and
405 * allow new one to be added.
407 if (local->num_sta >= IEEE80211_IBSS_MAX_STA_ENTRIES) {
409 printk(KERN_DEBUG "%s: No room for a new IBSS STA entry %pM\n",
414 if (ifibss->state == IEEE80211_IBSS_MLME_SEARCH)
417 if (compare_ether_addr(bssid, sdata->u.ibss.bssid))
420 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
421 printk(KERN_DEBUG "%s: Adding new IBSS station %pM (dev=%s)\n",
422 wiphy_name(local->hw.wiphy), addr, sdata->name);
425 sta = sta_info_alloc(sdata, addr, gfp);
429 set_sta_flags(sta, WLAN_STA_AUTHORIZED);
431 /* make sure mandatory rates are always added */
432 sta->sta.supp_rates[band] = supp_rates |
433 ieee80211_mandatory_rates(local, band);
435 rate_control_rate_init(sta);
437 /* If it fails, maybe we raced another insertion? */
438 if (sta_info_insert(sta))
439 return sta_info_get(sdata, addr);
443 static int ieee80211_sta_active_ibss(struct ieee80211_sub_if_data *sdata)
445 struct ieee80211_local *local = sdata->local;
447 struct sta_info *sta;
451 list_for_each_entry_rcu(sta, &local->sta_list, list) {
452 if (sta->sdata == sdata &&
453 time_after(sta->last_rx + IEEE80211_IBSS_MERGE_INTERVAL,
466 * This function is called with state == IEEE80211_IBSS_MLME_JOINED
469 static void ieee80211_sta_merge_ibss(struct ieee80211_sub_if_data *sdata)
471 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
473 mod_timer(&ifibss->timer,
474 round_jiffies(jiffies + IEEE80211_IBSS_MERGE_INTERVAL));
476 ieee80211_sta_expire(sdata, IEEE80211_IBSS_INACTIVITY_LIMIT);
478 if (time_before(jiffies, ifibss->last_scan_completed +
479 IEEE80211_IBSS_MERGE_INTERVAL))
482 if (ieee80211_sta_active_ibss(sdata))
485 if (ifibss->fixed_channel)
488 printk(KERN_DEBUG "%s: No active IBSS STAs - trying to scan for other "
489 "IBSS networks with same SSID (merge)\n", sdata->name);
491 ieee80211_request_internal_scan(sdata,
492 ifibss->ssid, ifibss->ssid_len,
493 ifibss->fixed_channel ? ifibss->channel : NULL);
496 static void ieee80211_sta_create_ibss(struct ieee80211_sub_if_data *sdata)
498 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
499 struct ieee80211_local *local = sdata->local;
500 struct ieee80211_supported_band *sband;
505 if (ifibss->fixed_bssid) {
506 memcpy(bssid, ifibss->bssid, ETH_ALEN);
508 /* Generate random, not broadcast, locally administered BSSID. Mix in
509 * own MAC address to make sure that devices that do not have proper
510 * random number generator get different BSSID. */
511 get_random_bytes(bssid, ETH_ALEN);
512 for (i = 0; i < ETH_ALEN; i++)
513 bssid[i] ^= sdata->vif.addr[i];
518 printk(KERN_DEBUG "%s: Creating new IBSS network, BSSID %pM\n",
521 sband = local->hw.wiphy->bands[ifibss->channel->band];
523 capability = WLAN_CAPABILITY_IBSS;
526 capability |= WLAN_CAPABILITY_PRIVACY;
528 sdata->drop_unencrypted = 0;
530 __ieee80211_sta_join_ibss(sdata, bssid, sdata->vif.bss_conf.beacon_int,
531 ifibss->channel, 3, /* first two are basic */
536 * This function is called with state == IEEE80211_IBSS_MLME_SEARCH
539 static void ieee80211_sta_find_ibss(struct ieee80211_sub_if_data *sdata)
541 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
542 struct ieee80211_local *local = sdata->local;
543 struct cfg80211_bss *cbss;
544 struct ieee80211_channel *chan = NULL;
545 const u8 *bssid = NULL;
549 active_ibss = ieee80211_sta_active_ibss(sdata);
550 #ifdef CONFIG_MAC80211_IBSS_DEBUG
551 printk(KERN_DEBUG "%s: sta_find_ibss (active_ibss=%d)\n",
552 sdata->name, active_ibss);
553 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
558 capability = WLAN_CAPABILITY_IBSS;
560 capability |= WLAN_CAPABILITY_PRIVACY;
561 if (ifibss->fixed_bssid)
562 bssid = ifibss->bssid;
563 if (ifibss->fixed_channel)
564 chan = ifibss->channel;
565 if (!is_zero_ether_addr(ifibss->bssid))
566 bssid = ifibss->bssid;
567 cbss = cfg80211_get_bss(local->hw.wiphy, chan, bssid,
568 ifibss->ssid, ifibss->ssid_len,
569 WLAN_CAPABILITY_IBSS | WLAN_CAPABILITY_PRIVACY,
573 struct ieee80211_bss *bss;
575 bss = (void *)cbss->priv;
576 #ifdef CONFIG_MAC80211_IBSS_DEBUG
577 printk(KERN_DEBUG " sta_find_ibss: selected %pM current "
578 "%pM\n", cbss->bssid, ifibss->bssid);
579 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
581 printk(KERN_DEBUG "%s: Selected IBSS BSSID %pM"
582 " based on configured SSID\n",
583 sdata->name, cbss->bssid);
585 ieee80211_sta_join_ibss(sdata, bss);
586 ieee80211_rx_bss_put(local, bss);
590 #ifdef CONFIG_MAC80211_IBSS_DEBUG
591 printk(KERN_DEBUG " did not try to join ibss\n");
592 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
594 /* Selected IBSS not found in current scan results - try to scan */
595 if (time_after(jiffies, ifibss->last_scan_completed +
596 IEEE80211_SCAN_INTERVAL)) {
597 printk(KERN_DEBUG "%s: Trigger new scan to find an IBSS to "
598 "join\n", sdata->name);
600 ieee80211_request_internal_scan(sdata,
601 ifibss->ssid, ifibss->ssid_len,
602 ifibss->fixed_channel ? ifibss->channel : NULL);
604 int interval = IEEE80211_SCAN_INTERVAL;
606 if (time_after(jiffies, ifibss->ibss_join_req +
607 IEEE80211_IBSS_JOIN_TIMEOUT)) {
608 if (!(local->oper_channel->flags & IEEE80211_CHAN_NO_IBSS)) {
609 ieee80211_sta_create_ibss(sdata);
612 printk(KERN_DEBUG "%s: IBSS not allowed on"
613 " %d MHz\n", sdata->name,
614 local->hw.conf.channel->center_freq);
616 /* No IBSS found - decrease scan interval and continue
618 interval = IEEE80211_SCAN_INTERVAL_SLOW;
621 mod_timer(&ifibss->timer,
622 round_jiffies(jiffies + interval));
626 static void ieee80211_rx_mgmt_probe_req(struct ieee80211_sub_if_data *sdata,
627 struct ieee80211_mgmt *mgmt,
630 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
631 struct ieee80211_local *local = sdata->local;
634 struct ieee80211_mgmt *resp;
637 if (ifibss->state != IEEE80211_IBSS_MLME_JOINED ||
638 len < 24 + 2 || !ifibss->presp)
641 tx_last_beacon = drv_tx_last_beacon(local);
643 #ifdef CONFIG_MAC80211_IBSS_DEBUG
644 printk(KERN_DEBUG "%s: RX ProbeReq SA=%pM DA=%pM BSSID=%pM"
645 " (tx_last_beacon=%d)\n",
646 sdata->name, mgmt->sa, mgmt->da,
647 mgmt->bssid, tx_last_beacon);
648 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
653 if (memcmp(mgmt->bssid, ifibss->bssid, ETH_ALEN) != 0 &&
654 memcmp(mgmt->bssid, "\xff\xff\xff\xff\xff\xff", ETH_ALEN) != 0)
657 end = ((u8 *) mgmt) + len;
658 pos = mgmt->u.probe_req.variable;
659 if (pos[0] != WLAN_EID_SSID ||
660 pos + 2 + pos[1] > end) {
661 #ifdef CONFIG_MAC80211_IBSS_DEBUG
662 printk(KERN_DEBUG "%s: Invalid SSID IE in ProbeReq "
664 sdata->name, mgmt->sa);
669 (pos[1] != ifibss->ssid_len ||
670 memcmp(pos + 2, ifibss->ssid, ifibss->ssid_len))) {
671 /* Ignore ProbeReq for foreign SSID */
675 /* Reply with ProbeResp */
676 skb = skb_copy(ifibss->presp, GFP_KERNEL);
680 resp = (struct ieee80211_mgmt *) skb->data;
681 memcpy(resp->da, mgmt->sa, ETH_ALEN);
682 #ifdef CONFIG_MAC80211_IBSS_DEBUG
683 printk(KERN_DEBUG "%s: Sending ProbeResp to %pM\n",
684 sdata->name, resp->da);
685 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
686 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
687 ieee80211_tx_skb(sdata, skb);
690 static void ieee80211_rx_mgmt_probe_resp(struct ieee80211_sub_if_data *sdata,
691 struct ieee80211_mgmt *mgmt,
693 struct ieee80211_rx_status *rx_status)
696 struct ieee802_11_elems elems;
698 if (memcmp(mgmt->da, sdata->vif.addr, ETH_ALEN))
699 return; /* ignore ProbeResp to foreign address */
701 baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt;
705 ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen,
708 ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems, false);
711 static void ieee80211_rx_mgmt_beacon(struct ieee80211_sub_if_data *sdata,
712 struct ieee80211_mgmt *mgmt,
714 struct ieee80211_rx_status *rx_status)
717 struct ieee802_11_elems elems;
719 /* Process beacon from the current BSS */
720 baselen = (u8 *) mgmt->u.beacon.variable - (u8 *) mgmt;
724 ieee802_11_parse_elems(mgmt->u.beacon.variable, len - baselen, &elems);
726 ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems, true);
729 static void ieee80211_ibss_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata,
732 struct ieee80211_rx_status *rx_status;
733 struct ieee80211_mgmt *mgmt;
736 rx_status = IEEE80211_SKB_RXCB(skb);
737 mgmt = (struct ieee80211_mgmt *) skb->data;
738 fc = le16_to_cpu(mgmt->frame_control);
740 switch (fc & IEEE80211_FCTL_STYPE) {
741 case IEEE80211_STYPE_PROBE_REQ:
742 ieee80211_rx_mgmt_probe_req(sdata, mgmt, skb->len);
744 case IEEE80211_STYPE_PROBE_RESP:
745 ieee80211_rx_mgmt_probe_resp(sdata, mgmt, skb->len,
748 case IEEE80211_STYPE_BEACON:
749 ieee80211_rx_mgmt_beacon(sdata, mgmt, skb->len,
752 case IEEE80211_STYPE_AUTH:
753 ieee80211_rx_mgmt_auth_ibss(sdata, mgmt, skb->len);
760 static void ieee80211_ibss_work(struct work_struct *work)
762 struct ieee80211_sub_if_data *sdata =
763 container_of(work, struct ieee80211_sub_if_data, u.ibss.work);
764 struct ieee80211_local *local = sdata->local;
765 struct ieee80211_if_ibss *ifibss;
768 if (WARN_ON(local->suspended))
771 if (!ieee80211_sdata_running(sdata))
777 if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_ADHOC))
779 ifibss = &sdata->u.ibss;
781 while ((skb = skb_dequeue(&ifibss->skb_queue)))
782 ieee80211_ibss_rx_queued_mgmt(sdata, skb);
784 if (!test_and_clear_bit(IEEE80211_IBSS_REQ_RUN, &ifibss->request))
787 switch (ifibss->state) {
788 case IEEE80211_IBSS_MLME_SEARCH:
789 ieee80211_sta_find_ibss(sdata);
791 case IEEE80211_IBSS_MLME_JOINED:
792 ieee80211_sta_merge_ibss(sdata);
800 static void ieee80211_ibss_timer(unsigned long data)
802 struct ieee80211_sub_if_data *sdata =
803 (struct ieee80211_sub_if_data *) data;
804 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
805 struct ieee80211_local *local = sdata->local;
807 if (local->quiescing) {
808 ifibss->timer_running = true;
812 set_bit(IEEE80211_IBSS_REQ_RUN, &ifibss->request);
813 ieee80211_queue_work(&local->hw, &ifibss->work);
817 void ieee80211_ibss_quiesce(struct ieee80211_sub_if_data *sdata)
819 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
821 cancel_work_sync(&ifibss->work);
822 if (del_timer_sync(&ifibss->timer))
823 ifibss->timer_running = true;
826 void ieee80211_ibss_restart(struct ieee80211_sub_if_data *sdata)
828 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
830 if (ifibss->timer_running) {
831 add_timer(&ifibss->timer);
832 ifibss->timer_running = false;
837 void ieee80211_ibss_setup_sdata(struct ieee80211_sub_if_data *sdata)
839 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
841 INIT_WORK(&ifibss->work, ieee80211_ibss_work);
842 setup_timer(&ifibss->timer, ieee80211_ibss_timer,
843 (unsigned long) sdata);
844 skb_queue_head_init(&ifibss->skb_queue);
847 /* scan finished notification */
848 void ieee80211_ibss_notify_scan_completed(struct ieee80211_local *local)
850 struct ieee80211_sub_if_data *sdata;
852 mutex_lock(&local->iflist_mtx);
853 list_for_each_entry(sdata, &local->interfaces, list) {
854 if (!ieee80211_sdata_running(sdata))
856 if (sdata->vif.type != NL80211_IFTYPE_ADHOC)
858 if (!sdata->u.ibss.ssid_len)
860 sdata->u.ibss.last_scan_completed = jiffies;
861 mod_timer(&sdata->u.ibss.timer, 0);
863 mutex_unlock(&local->iflist_mtx);
867 ieee80211_ibss_rx_mgmt(struct ieee80211_sub_if_data *sdata, struct sk_buff *skb)
869 struct ieee80211_local *local = sdata->local;
870 struct ieee80211_mgmt *mgmt;
874 return RX_DROP_MONITOR;
876 mgmt = (struct ieee80211_mgmt *) skb->data;
877 fc = le16_to_cpu(mgmt->frame_control);
879 switch (fc & IEEE80211_FCTL_STYPE) {
880 case IEEE80211_STYPE_PROBE_RESP:
881 case IEEE80211_STYPE_BEACON:
882 case IEEE80211_STYPE_PROBE_REQ:
883 case IEEE80211_STYPE_AUTH:
884 skb_queue_tail(&sdata->u.ibss.skb_queue, skb);
885 ieee80211_queue_work(&local->hw, &sdata->u.ibss.work);
889 return RX_DROP_MONITOR;
892 int ieee80211_ibss_join(struct ieee80211_sub_if_data *sdata,
893 struct cfg80211_ibss_params *params)
898 memcpy(sdata->u.ibss.bssid, params->bssid, ETH_ALEN);
899 sdata->u.ibss.fixed_bssid = true;
901 sdata->u.ibss.fixed_bssid = false;
903 sdata->u.ibss.privacy = params->privacy;
905 sdata->vif.bss_conf.beacon_int = params->beacon_interval;
907 sdata->u.ibss.channel = params->channel;
908 sdata->u.ibss.fixed_channel = params->channel_fixed;
910 /* fix ourselves to that channel now already */
911 if (params->channel_fixed) {
912 sdata->local->oper_channel = params->channel;
913 sdata->local->oper_channel_type = NL80211_CHAN_NO_HT;
917 sdata->u.ibss.ie = kmemdup(params->ie, params->ie_len,
919 if (sdata->u.ibss.ie)
920 sdata->u.ibss.ie_len = params->ie_len;
923 skb = dev_alloc_skb(sdata->local->hw.extra_tx_headroom +
927 4 /* IBSS params */ +
932 sdata->u.ibss.skb = skb;
933 sdata->u.ibss.state = IEEE80211_IBSS_MLME_SEARCH;
934 sdata->u.ibss.ibss_join_req = jiffies;
936 memcpy(sdata->u.ibss.ssid, params->ssid, IEEE80211_MAX_SSID_LEN);
939 * The ssid_len setting below is used to see whether
940 * we are active, and we need all other settings
941 * before that may get visible.
945 sdata->u.ibss.ssid_len = params->ssid_len;
947 ieee80211_recalc_idle(sdata->local);
949 set_bit(IEEE80211_IBSS_REQ_RUN, &sdata->u.ibss.request);
950 ieee80211_queue_work(&sdata->local->hw, &sdata->u.ibss.work);
955 int ieee80211_ibss_leave(struct ieee80211_sub_if_data *sdata)
959 del_timer_sync(&sdata->u.ibss.timer);
960 clear_bit(IEEE80211_IBSS_REQ_RUN, &sdata->u.ibss.request);
961 cancel_work_sync(&sdata->u.ibss.work);
962 clear_bit(IEEE80211_IBSS_REQ_RUN, &sdata->u.ibss.request);
964 sta_info_flush(sdata->local, sdata);
967 kfree(sdata->u.ibss.ie);
968 skb = sdata->u.ibss.presp;
969 rcu_assign_pointer(sdata->u.ibss.presp, NULL);
970 sdata->vif.bss_conf.ibss_joined = false;
971 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BEACON_ENABLED |
976 skb_queue_purge(&sdata->u.ibss.skb_queue);
977 memset(sdata->u.ibss.bssid, 0, ETH_ALEN);
978 sdata->u.ibss.ssid_len = 0;
980 ieee80211_recalc_idle(sdata->local);