1 files changed, 165 insertions, 182 deletions

diff --git a/net/mac80211/ibss.c b/net/mac80211/ibss.c
index 3201e1f96365..4f7a54518be4 100644
--- a/net/mac80211/ibss.c
+++ b/net/mac80211/ibss.c
@@ -59,74 +59,59 @@ static void ieee80211_rx_mgmt_auth_ibss(struct ieee80211_sub_if_data *sdata,
                                     sdata->u.ibss.bssid, 0);
 }
 
-static int __ieee80211_sta_join_ibss(struct ieee80211_sub_if_data *sdata,
-                                     const u8 *bssid, const int beacon_int,
-                                     const int freq,
-                                     const size_t supp_rates_len,
-                                     const u8 *supp_rates,
-                                     const u16 capability, u64 tsf)
+static void __ieee80211_sta_join_ibss(struct ieee80211_sub_if_data *sdata,
+                                      const u8 *bssid, const int beacon_int,
+                                      struct ieee80211_channel *chan,
+                                      const size_t supp_rates_len,
+                                      const u8 *supp_rates,
+                                      const u16 capability, u64 tsf)
 {
         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
         struct ieee80211_local *local = sdata->local;
-        int res = 0, rates, i, j;
+        int rates, i, j;
         struct sk_buff *skb;
         struct ieee80211_mgmt *mgmt;
         u8 *pos;
         struct ieee80211_supported_band *sband;
-        union iwreq_data wrqu;
 
         if (local->ops->reset_tsf) {
                 /* Reset own TSF to allow time synchronization work. */
                 local->ops->reset_tsf(local_to_hw(local));
         }
 
-        if ((ifibss->flags & IEEE80211_IBSS_PREV_BSSID_SET) &&
-           memcmp(ifibss->bssid, bssid, ETH_ALEN) == 0)
-                return res;
+        skb = ifibss->skb;
+        rcu_assign_pointer(ifibss->presp, NULL);
+        synchronize_rcu();
+        skb->data = skb->head;
+        skb->len = 0;
+        skb_reset_tail_pointer(skb);
+        skb_reserve(skb, sdata->local->hw.extra_tx_headroom);
 
-        skb = dev_alloc_skb(local->hw.extra_tx_headroom + 400);
-        if (!skb) {
-                printk(KERN_DEBUG "%s: failed to allocate buffer for probe "
-                       "response\n", sdata->dev->name);
-                return -ENOMEM;
-        }
-
-        if (!(ifibss->flags & IEEE80211_IBSS_PREV_BSSID_SET)) {
-                /* Remove possible STA entries from other IBSS networks. */
-                sta_info_flush_delayed(sdata);
-        }
+        if (memcmp(ifibss->bssid, bssid, ETH_ALEN))
+                sta_info_flush(sdata->local, sdata);
 
         memcpy(ifibss->bssid, bssid, ETH_ALEN);
-        res = ieee80211_if_config(sdata, IEEE80211_IFCC_BSSID);
-        if (res)
-                return res;
 
         local->hw.conf.beacon_int = beacon_int >= 10 ? beacon_int : 10;
 
-        sdata->drop_unencrypted = capability &
-                WLAN_CAPABILITY_PRIVACY ? 1 : 0;
-
-        res = ieee80211_set_freq(sdata, freq);
+        sdata->drop_unencrypted = capability & WLAN_CAPABILITY_PRIVACY ? 1 : 0;
 
-        if (res)
-                return res;
+        ieee80211_if_config(sdata, IEEE80211_IFCC_BSSID);
 
-        sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
+        local->oper_channel = chan;
+        local->oper_channel_type = NL80211_CHAN_NO_HT;
+        ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_CHANNEL);
+        sband = local->hw.wiphy->bands[chan->band];
 
         /* Build IBSS probe response */
-
-        skb_reserve(skb, local->hw.extra_tx_headroom);
-
-        mgmt = (struct ieee80211_mgmt *)
-                skb_put(skb, 24 + sizeof(mgmt->u.beacon));
+        mgmt = (void *) skb_put(skb, 24 + sizeof(mgmt->u.beacon));
         memset(mgmt, 0, 24 + sizeof(mgmt->u.beacon));
         mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
                                           IEEE80211_STYPE_PROBE_RESP);
         memset(mgmt->da, 0xff, ETH_ALEN);
         memcpy(mgmt->sa, sdata->dev->dev_addr, ETH_ALEN);
         memcpy(mgmt->bssid, ifibss->bssid, ETH_ALEN);
-        mgmt->u.beacon.beacon_int =
-                cpu_to_le16(local->hw.conf.beacon_int);
+        mgmt->u.beacon.beacon_int = cpu_to_le16(local->hw.conf.beacon_int);
         mgmt->u.beacon.timestamp = cpu_to_le64(tsf);
         mgmt->u.beacon.capab_info = cpu_to_le16(capability);
 
@@ -147,7 +132,7 @@ static int __ieee80211_sta_join_ibss(struct ieee80211_sub_if_data *sdata,
                 pos = skb_put(skb, 2 + 1);
                 *pos++ = WLAN_EID_DS_PARAMS;
                 *pos++ = 1;
-                *pos++ = ieee80211_frequency_to_channel(freq);
+                *pos++ = ieee80211_frequency_to_channel(chan->center_freq);
         }
 
         pos = skb_put(skb, 2 + 2);
@@ -165,12 +150,15 @@ static int __ieee80211_sta_join_ibss(struct ieee80211_sub_if_data *sdata,
                 memcpy(pos, &supp_rates[8], rates);
         }
 
-        ifibss->probe_resp = skb;
+        if (ifibss->ie_len)
+                memcpy(skb_put(skb, ifibss->ie_len),
+                       ifibss->ie, ifibss->ie_len);
+
+        rcu_assign_pointer(ifibss->presp, skb);
 
         ieee80211_if_config(sdata, IEEE80211_IFCC_BEACON |
                                    IEEE80211_IFCC_BEACON_ENABLED);
 
-
         rates = 0;
         for (i = 0; i < supp_rates_len; i++) {
                 int bitrate = (supp_rates[i] & 0x7f) * 5;
@@ -181,27 +169,24 @@ static int __ieee80211_sta_join_ibss(struct ieee80211_sub_if_data *sdata,
 
         ieee80211_sta_def_wmm_params(sdata, supp_rates_len, supp_rates);
 
-        ifibss->flags |= IEEE80211_IBSS_PREV_BSSID_SET;
         ifibss->state = IEEE80211_IBSS_MLME_JOINED;
-        mod_timer(&ifibss->timer, jiffies + IEEE80211_IBSS_MERGE_INTERVAL);
+        mod_timer(&ifibss->timer,
+                  round_jiffies(jiffies + IEEE80211_IBSS_MERGE_INTERVAL));
 
-        memset(&wrqu, 0, sizeof(wrqu));
-        memcpy(wrqu.ap_addr.sa_data, bssid, ETH_ALEN);
-        wireless_send_event(sdata->dev, SIOCGIWAP, &wrqu, NULL);
-
-        return res;
+        cfg80211_inform_bss_frame(local->hw.wiphy, local->hw.conf.channel,
+                                  mgmt, skb->len, 0, GFP_KERNEL);
+        cfg80211_ibss_joined(sdata->dev, ifibss->bssid, GFP_KERNEL);
 }
 
-static int ieee80211_sta_join_ibss(struct ieee80211_sub_if_data *sdata,
-                                   struct ieee80211_bss *bss)
+static void ieee80211_sta_join_ibss(struct ieee80211_sub_if_data *sdata,
+                                    struct ieee80211_bss *bss)
 {
-        return __ieee80211_sta_join_ibss(sdata,
-                                         bss->cbss.bssid,
-                                         bss->cbss.beacon_interval,
-                                         bss->cbss.channel->center_freq,
-                                         bss->supp_rates_len, bss->supp_rates,
-                                         bss->cbss.capability,
-                                         bss->cbss.tsf);
+        __ieee80211_sta_join_ibss(sdata, bss->cbss.bssid,
+                                  bss->cbss.beacon_interval,
+                                  bss->cbss.channel,
+                                  bss->supp_rates_len, bss->supp_rates,
+                                  bss->cbss.capability,
+                                  bss->cbss.tsf);
 }
 
 static void ieee80211_rx_bss_info(struct ieee80211_sub_if_data *sdata,
@@ -277,7 +262,7 @@ static void ieee80211_rx_bss_info(struct ieee80211_sub_if_data *sdata,
                 goto put_bss;
 
         /* we use a fixed BSSID */
-        if (sdata->u.ibss.flags & IEEE80211_IBSS_BSSID_SET)
+        if (sdata->u.ibss.bssid)
                 goto put_bss;
 
         /* not an IBSS */
@@ -369,13 +354,14 @@ struct sta_info *ieee80211_ibss_add_sta(struct ieee80211_sub_if_data *sdata,
         struct sta_info *sta;
         int band = local->hw.conf.channel->band;
 
-        /* TODO: Could consider removing the least recently used entry and
-         * allow new one to be added. */
+        /*
+         * XXX: Consider removing the least recently used entry and
+         *      allow new one to be added.
+         */
         if (local->num_sta >= IEEE80211_IBSS_MAX_STA_ENTRIES) {
-                if (net_ratelimit()) {
-                        printk(KERN_DEBUG "%s: No room for a new IBSS STA "
-                               "entry %pM\n", sdata->dev->name, addr);
-                }
+                if (net_ratelimit())
+                        printk(KERN_DEBUG "%s: No room for a new IBSS STA entry %pM\n",
+                               sdata->dev->name, addr);
                 return NULL;
         }
 
@@ -432,14 +418,15 @@ static void ieee80211_sta_merge_ibss(struct ieee80211_sub_if_data *sdata)
 {
         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
 
-        mod_timer(&ifibss->timer, jiffies + IEEE80211_IBSS_MERGE_INTERVAL);
+        mod_timer(&ifibss->timer,
+                  round_jiffies(jiffies + IEEE80211_IBSS_MERGE_INTERVAL));
 
         ieee80211_sta_expire(sdata, IEEE80211_IBSS_INACTIVITY_LIMIT);
+
         if (ieee80211_sta_active_ibss(sdata))
                 return;
 
-        if ((ifibss->flags & IEEE80211_IBSS_BSSID_SET) &&
-            (!(ifibss->flags & IEEE80211_IBSS_AUTO_CHANNEL_SEL)))
+        if (ifibss->fixed_channel)
                 return;
 
         printk(KERN_DEBUG "%s: No active IBSS STAs - trying to scan for other "
@@ -455,7 +442,7 @@ static void ieee80211_sta_merge_ibss(struct ieee80211_sub_if_data *sdata)
         ieee80211_request_scan(sdata, &sdata->local->int_scan_req);
 }
 
-static int ieee80211_sta_create_ibss(struct ieee80211_sub_if_data *sdata)
+static void ieee80211_sta_create_ibss(struct ieee80211_sub_if_data *sdata)
 {
         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
         struct ieee80211_local *local = sdata->local;
@@ -466,7 +453,7 @@ static int ieee80211_sta_create_ibss(struct ieee80211_sub_if_data *sdata)
         u16 capability;
         int i;
 
-        if (ifibss->flags & IEEE80211_IBSS_BSSID_SET) {
+        if (ifibss->fixed_bssid) {
                 memcpy(bssid, ifibss->bssid, ETH_ALEN);
         } else {
                 /* Generate random, not broadcast, locally administered BSSID. Mix in
@@ -482,7 +469,7 @@ static int ieee80211_sta_create_ibss(struct ieee80211_sub_if_data *sdata)
         printk(KERN_DEBUG "%s: Creating new IBSS network, BSSID %pM\n",
                sdata->dev->name, bssid);
 
-        sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
+        sband = local->hw.wiphy->bands[ifibss->channel->band];
 
         if (local->hw.conf.beacon_int == 0)
                 local->hw.conf.beacon_int = 100;
@@ -500,24 +487,20 @@ static int ieee80211_sta_create_ibss(struct ieee80211_sub_if_data *sdata)
                 *pos++ = (u8) (rate / 5);
         }
 
-        return __ieee80211_sta_join_ibss(sdata,
-                                         bssid, local->hw.conf.beacon_int,
-                                         local->hw.conf.channel->center_freq,
-                                         sband->n_bitrates, supp_rates,
-                                         capability, 0);
+        __ieee80211_sta_join_ibss(sdata, bssid, local->hw.conf.beacon_int,
+                                  ifibss->channel, sband->n_bitrates,
+                                  supp_rates, capability, 0);
 }
 
-static int ieee80211_sta_find_ibss(struct ieee80211_sub_if_data *sdata)
+static void ieee80211_sta_find_ibss(struct ieee80211_sub_if_data *sdata)
 {
         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
         struct ieee80211_local *local = sdata->local;
         struct ieee80211_bss *bss;
+        struct ieee80211_channel *chan = NULL;
         const u8 *bssid = NULL;
         int active_ibss;
 
-        if (ifibss->ssid_len == 0)
-                return -EINVAL;
-
         active_ibss = ieee80211_sta_active_ibss(sdata);
 #ifdef CONFIG_MAC80211_IBSS_DEBUG
         printk(KERN_DEBUG "%s: sta_find_ibss (active_ibss=%d)\n",
@@ -525,11 +508,15 @@ static int ieee80211_sta_find_ibss(struct ieee80211_sub_if_data *sdata)
 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
 
         if (active_ibss)
-                return 0;
+                return;
 
-        if (ifibss->flags & IEEE80211_IBSS_BSSID_SET)
+        if (ifibss->fixed_bssid)
+                bssid = ifibss->bssid;
+        if (ifibss->fixed_channel)
+                chan = ifibss->channel;
+        if (!is_zero_ether_addr(ifibss->bssid))
                 bssid = ifibss->bssid;
-        bss = (void *)cfg80211_get_bss(local->hw.wiphy, NULL, bssid,
+        bss = (void *)cfg80211_get_bss(local->hw.wiphy, chan, bssid,
                                        ifibss->ssid, ifibss->ssid_len,
                                        WLAN_CAPABILITY_IBSS,
                                        WLAN_CAPABILITY_IBSS);
@@ -540,18 +527,14 @@ static int ieee80211_sta_find_ibss(struct ieee80211_sub_if_data *sdata)
                        "%pM\n", bss->cbss.bssid, ifibss->bssid);
 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
 
-        if (bss &&
-            (!(ifibss->flags & IEEE80211_IBSS_PREV_BSSID_SET) ||
-             memcmp(ifibss->bssid, bss->cbss.bssid, ETH_ALEN))) {
-                int ret;
-
+        if (bss && memcmp(ifibss->bssid, bss->cbss.bssid, ETH_ALEN)) {
                 printk(KERN_DEBUG "%s: Selected IBSS BSSID %pM"
                        " based on configured SSID\n",
                        sdata->dev->name, bss->cbss.bssid);
 
-                ret = ieee80211_sta_join_ibss(sdata, bss);
+                ieee80211_sta_join_ibss(sdata, bss);
                 ieee80211_rx_bss_put(local, bss);
-                return ret;
+                return;
         } else if (bss)
                 ieee80211_rx_bss_put(local, bss);
 
@@ -562,29 +545,31 @@ static int ieee80211_sta_find_ibss(struct ieee80211_sub_if_data *sdata)
         /* Selected IBSS not found in current scan results - try to scan */
         if (ifibss->state == IEEE80211_IBSS_MLME_JOINED &&
             !ieee80211_sta_active_ibss(sdata)) {
-                mod_timer(&ifibss->timer, jiffies +
-                                          IEEE80211_IBSS_MERGE_INTERVAL);
-        } else if (time_after(jiffies, local->last_scan_completed +
+                mod_timer(&ifibss->timer,
+                          round_jiffies(jiffies + IEEE80211_IBSS_MERGE_INTERVAL));
+        } else if (time_after(jiffies, ifibss->last_scan_completed +
                                         IEEE80211_SCAN_INTERVAL)) {
                 printk(KERN_DEBUG "%s: Trigger new scan to find an IBSS to "
                        "join\n", sdata->dev->name);
 
                 /* XXX maybe racy? */
                 if (local->scan_req)
-                        return -EBUSY;
+                        return;
 
                 memcpy(local->int_scan_req.ssids[0].ssid,
                        ifibss->ssid, IEEE80211_MAX_SSID_LEN);
-                local->int_scan_req.ssids[0].ssid_len = ifibss->ssid_len;
-                return ieee80211_request_scan(sdata, &local->int_scan_req);
+                local->int_scan_req.ssids[0].ssid_len =
+                        ifibss->ssid_len;
+                ieee80211_request_scan(sdata, &local->int_scan_req);
         } else if (ifibss->state != IEEE80211_IBSS_MLME_JOINED) {
                 int interval = IEEE80211_SCAN_INTERVAL;
 
                 if (time_after(jiffies, ifibss->ibss_join_req +
                                IEEE80211_IBSS_JOIN_TIMEOUT)) {
-                        if (!(local->oper_channel->flags &
-                                                IEEE80211_CHAN_NO_IBSS))
-                                return ieee80211_sta_create_ibss(sdata);
+                        if (!(local->oper_channel->flags & IEEE80211_CHAN_NO_IBSS)) {
+                                ieee80211_sta_create_ibss(sdata);
+                                return;
+                        }
                         printk(KERN_DEBUG "%s: IBSS not allowed on"
                                " %d MHz\n", sdata->dev->name,
                                local->hw.conf.channel->center_freq);
@@ -595,11 +580,9 @@ static int ieee80211_sta_find_ibss(struct ieee80211_sub_if_data *sdata)
                 }
 
                 ifibss->state = IEEE80211_IBSS_MLME_SEARCH;
-                mod_timer(&ifibss->timer, jiffies + interval);
-                return 0;
+                mod_timer(&ifibss->timer,
+                          round_jiffies(jiffies + interval));
         }
-
-        return 0;
 }
 
 static void ieee80211_rx_mgmt_probe_req(struct ieee80211_sub_if_data *sdata,
@@ -614,7 +597,7 @@ static void ieee80211_rx_mgmt_probe_req(struct ieee80211_sub_if_data *sdata,
         u8 *pos, *end;
 
         if (ifibss->state != IEEE80211_IBSS_MLME_JOINED ||
-            len < 24 + 2 || !ifibss->probe_resp)
+            len < 24 + 2 || !ifibss->presp)
                 return;
 
         if (local->ops->tx_last_beacon)
@@ -649,13 +632,13 @@ static void ieee80211_rx_mgmt_probe_req(struct ieee80211_sub_if_data *sdata,
         }
         if (pos[1] != 0 &&
             (pos[1] != ifibss->ssid_len ||
-             memcmp(pos + 2, ifibss->ssid, ifibss->ssid_len) != 0)) {
+             !memcmp(pos + 2, ifibss->ssid, ifibss->ssid_len))) {
                 /* Ignore ProbeReq for foreign SSID */
                 return;
         }
 
         /* Reply with ProbeResp */
-        skb = skb_copy(ifibss->probe_resp, GFP_KERNEL);
+        skb = skb_copy(ifibss->presp, GFP_KERNEL);
         if (!skb)
                 return;
 
@@ -794,89 +777,21 @@ void ieee80211_ibss_setup_sdata(struct ieee80211_sub_if_data *sdata)
         setup_timer(&ifibss->timer, ieee80211_ibss_timer,
                     (unsigned long) sdata);
         skb_queue_head_init(&ifibss->skb_queue);
-
-        ifibss->flags |= IEEE80211_IBSS_AUTO_BSSID_SEL |
-                        IEEE80211_IBSS_AUTO_CHANNEL_SEL;
-}
-
-int ieee80211_ibss_commit(struct ieee80211_sub_if_data *sdata)
-{
-        struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
-
-        ifibss->flags &= ~IEEE80211_IBSS_PREV_BSSID_SET;
-
-        if (ifibss->ssid_len)
-                ifibss->flags |= IEEE80211_IBSS_SSID_SET;
-        else
-                ifibss->flags &= ~IEEE80211_IBSS_SSID_SET;
-
-        ifibss->ibss_join_req = jiffies;
-        ifibss->state = IEEE80211_IBSS_MLME_SEARCH;
-        set_bit(IEEE80211_IBSS_REQ_RUN, &ifibss->request);
-
-        return 0;
-}
-
-int ieee80211_ibss_set_ssid(struct ieee80211_sub_if_data *sdata, char *ssid, size_t len)
-{
-        struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
-
-        if (len > IEEE80211_MAX_SSID_LEN)
-                return -EINVAL;
-
-        if (ifibss->ssid_len != len || memcmp(ifibss->ssid, ssid, len) != 0) {
-                memset(ifibss->ssid, 0, sizeof(ifibss->ssid));
-                memcpy(ifibss->ssid, ssid, len);
-                ifibss->ssid_len = len;
-        }
-
-        return ieee80211_ibss_commit(sdata);
-}
-
-int ieee80211_ibss_get_ssid(struct ieee80211_sub_if_data *sdata, char *ssid, size_t *len)
-{
-        struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
-
-        memcpy(ssid, ifibss->ssid, ifibss->ssid_len);
-        *len = ifibss->ssid_len;
-
-        return 0;
-}
-
-int ieee80211_ibss_set_bssid(struct ieee80211_sub_if_data *sdata, u8 *bssid)
-{
-        struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
-
-        if (is_valid_ether_addr(bssid)) {
-                memcpy(ifibss->bssid, bssid, ETH_ALEN);
-                ifibss->flags |= IEEE80211_IBSS_BSSID_SET;
-        } else {
-                memset(ifibss->bssid, 0, ETH_ALEN);
-                ifibss->flags &= ~IEEE80211_IBSS_BSSID_SET;
-        }
-
-        if (netif_running(sdata->dev)) {
-                if (ieee80211_if_config(sdata, IEEE80211_IFCC_BSSID)) {
-                        printk(KERN_DEBUG "%s: Failed to config new BSSID to "
-                               "the low-level driver\n", sdata->dev->name);
-                }
-        }
-
-        return ieee80211_ibss_commit(sdata);
 }
 
 /* scan finished notification */
 void ieee80211_ibss_notify_scan_completed(struct ieee80211_local *local)
 {
-        struct ieee80211_sub_if_data *sdata = local->scan_sdata;
-        struct ieee80211_if_ibss *ifibss;
+        struct ieee80211_sub_if_data *sdata;
 
-        if (sdata && sdata->vif.type == NL80211_IFTYPE_ADHOC) {
-                ifibss = &sdata->u.ibss;
-                if ((!(ifibss->flags & IEEE80211_IBSS_PREV_BSSID_SET)) ||
-                    !ieee80211_sta_active_ibss(sdata))
-                        ieee80211_sta_find_ibss(sdata);
+        rcu_read_lock();
+        list_for_each_entry_rcu(sdata, &local->interfaces, list) {
+                if (sdata->vif.type != NL80211_IFTYPE_ADHOC)
+                        continue;
+                sdata->u.ibss.last_scan_completed = jiffies;
+                ieee80211_sta_find_ibss(sdata);
         }
+        rcu_read_unlock();
 }
 
 ieee80211_rx_result
@@ -906,3 +821,71 @@ ieee80211_ibss_rx_mgmt(struct ieee80211_sub_if_data *sdata, struct sk_buff *skb,
 
         return RX_DROP_MONITOR;
 }
+
+int ieee80211_ibss_join(struct ieee80211_sub_if_data *sdata,
+                        struct cfg80211_ibss_params *params)
+{
+        struct sk_buff *skb;
+
+        memcpy(sdata->u.ibss.ssid, params->ssid, IEEE80211_MAX_SSID_LEN);
+        sdata->u.ibss.ssid_len = params->ssid_len;
+
+        if (params->bssid) {
+                memcpy(sdata->u.ibss.bssid, params->bssid, ETH_ALEN);
+                sdata->u.ibss.fixed_bssid = true;
+        } else
+                sdata->u.ibss.fixed_bssid = false;
+
+        sdata->u.ibss.channel = params->channel;
+        sdata->u.ibss.fixed_channel = params->channel_fixed;
+
+        if (params->ie) {
+                sdata->u.ibss.ie = kmemdup(params->ie, params->ie_len,
+                                           GFP_KERNEL);
+                if (sdata->u.ibss.ie)
+                        sdata->u.ibss.ie_len = params->ie_len;
+        }
+
+        skb = dev_alloc_skb(sdata->local->hw.extra_tx_headroom +
+                            36 /* bitrates */ +
+                            34 /* SSID */ +
+                            3  /* DS params */ +
+                            4  /* IBSS params */ +
+                            params->ie_len);
+        if (!skb)
+                return -ENOMEM;
+
+        sdata->u.ibss.skb = skb;
+        sdata->u.ibss.state = IEEE80211_IBSS_MLME_SEARCH;
+        sdata->u.ibss.ibss_join_req = jiffies;
+
+        set_bit(IEEE80211_IBSS_REQ_RUN, &sdata->u.ibss.request);
+        queue_work(sdata->local->hw.workqueue, &sdata->u.ibss.work);
+
+        return 0;
+}
+
+int ieee80211_ibss_leave(struct ieee80211_sub_if_data *sdata)
+{
+        struct sk_buff *skb;
+
+        del_timer_sync(&sdata->u.ibss.timer);
+        clear_bit(IEEE80211_IBSS_REQ_RUN, &sdata->u.ibss.request);
+        cancel_work_sync(&sdata->u.ibss.work);
+        clear_bit(IEEE80211_IBSS_REQ_RUN, &sdata->u.ibss.request);
+
+        sta_info_flush(sdata->local, sdata);
+
+        /* remove beacon */
+        kfree(sdata->u.ibss.ie);
+        skb = sdata->u.ibss.presp;
+        rcu_assign_pointer(sdata->u.ibss.presp, NULL);
+        ieee80211_if_config(sdata, IEEE80211_IFCC_BEACON_ENABLED);
+        synchronize_rcu();
+        kfree_skb(skb);
+
+        skb_queue_purge(&sdata->u.ibss.skb_queue);
+        memset(sdata->u.ibss.bssid, 0, ETH_ALEN);
+
+        return 0;
+}