/* * IBSS mode implementation * Copyright 2003-2008, Jouni Malinen * Copyright 2004, Instant802 Networks, Inc. * Copyright 2005, Devicescape Software, Inc. * Copyright 2006-2007 Jiri Benc * Copyright 2007, Michael Wu * Copyright 2009, Johannes Berg * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License version 2 as * published by the Free Software Foundation. */ #include #include #include #include #include #include #include #include #include "ieee80211_i.h" #include "rate.h" #define IEEE80211_SCAN_INTERVAL (2 * HZ) #define IEEE80211_SCAN_INTERVAL_SLOW (15 * HZ) #define IEEE80211_IBSS_JOIN_TIMEOUT (7 * HZ) #define IEEE80211_IBSS_MERGE_INTERVAL (30 * HZ) #define IEEE80211_IBSS_MERGE_DELAY 0x400000 #define IEEE80211_IBSS_INACTIVITY_LIMIT (60 * HZ) #define IEEE80211_IBSS_MAX_STA_ENTRIES 128 static void ieee80211_rx_mgmt_auth_ibss(struct ieee80211_sub_if_data *sdata, struct ieee80211_mgmt *mgmt, size_t len) { u16 auth_alg, auth_transaction, status_code; if (len < 24 + 6) return; auth_alg = le16_to_cpu(mgmt->u.auth.auth_alg); auth_transaction = le16_to_cpu(mgmt->u.auth.auth_transaction); status_code = le16_to_cpu(mgmt->u.auth.status_code); /* * IEEE 802.11 standard does not require authentication in IBSS * networks and most implementations do not seem to use it. * However, try to reply to authentication attempts if someone * has actually implemented this. */ if (auth_alg == WLAN_AUTH_OPEN && auth_transaction == 1) ieee80211_send_auth(sdata, 2, WLAN_AUTH_OPEN, NULL, 0, sdata->u.ibss.bssid, 0); } 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 rates, i, j; struct sk_buff *skb; struct ieee80211_mgmt *mgmt; u8 *pos; struct ieee80211_supported_band *sband; u32 bss_change; if (local->ops->reset_tsf) { /* Reset own TSF to allow time synchronization work. */ local->ops->reset_tsf(local_to_hw(local)); } 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); if (memcmp(ifibss->bssid, bssid, ETH_ALEN)) sta_info_flush(sdata->local, sdata); memcpy(ifibss->bssid, bssid, ETH_ALEN); sdata->drop_unencrypted = capability & WLAN_CAPABILITY_PRIVACY ? 1 : 0; ieee80211_if_config(sdata, IEEE80211_IFCC_BSSID); local->oper_channel = chan; local->oper_channel_type = NL80211_CHAN_NO_HT; ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_CHANNEL); sdata->vif.bss_conf.beacon_int = beacon_int; bss_change = BSS_CHANGED_BEACON_INT; bss_change |= ieee80211_reset_erp_info(sdata); ieee80211_bss_info_change_notify(sdata, bss_change); sband = local->hw.wiphy->bands[chan->band]; /* Build IBSS probe response */ 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(beacon_int); mgmt->u.beacon.timestamp = cpu_to_le64(tsf); mgmt->u.beacon.capab_info = cpu_to_le16(capability); pos = skb_put(skb, 2 + ifibss->ssid_len); *pos++ = WLAN_EID_SSID; *pos++ = ifibss->ssid_len; memcpy(pos, ifibss->ssid, ifibss->ssid_len); rates = supp_rates_len; if (rates > 8) rates = 8; pos = skb_put(skb, 2 + rates); *pos++ = WLAN_EID_SUPP_RATES; *pos++ = rates; memcpy(pos, supp_rates, rates); if (sband->band == IEEE80211_BAND_2GHZ) { pos = skb_put(skb, 2 + 1); *pos++ = WLAN_EID_DS_PARAMS; *pos++ = 1; *pos++ = ieee80211_frequency_to_channel(chan->center_freq); } pos = skb_put(skb, 2 + 2); *pos++ = WLAN_EID_IBSS_PARAMS; *pos++ = 2; /* FIX: set ATIM window based on scan results */ *pos++ = 0; *pos++ = 0; if (supp_rates_len > 8) { rates = supp_rates_len - 8; pos = skb_put(skb, 2 + rates); *pos++ = WLAN_EID_EXT_SUPP_RATES; *pos++ = rates; memcpy(pos, &supp_rates[8], rates); } 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; for (j = 0; j < sband->n_bitrates; j++) if (sband->bitrates[j].bitrate == bitrate) rates |= BIT(j); } ieee80211_sta_def_wmm_params(sdata, supp_rates_len, supp_rates); ifibss->state = IEEE80211_IBSS_MLME_JOINED; mod_timer(&ifibss->timer, round_jiffies(jiffies + IEEE80211_IBSS_MERGE_INTERVAL)); 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 void ieee80211_sta_join_ibss(struct ieee80211_sub_if_data *sdata, struct ieee80211_bss *bss) { u16 beacon_int = bss->cbss.beacon_interval; if (beacon_int < 10) beacon_int = 10; __ieee80211_sta_join_ibss(sdata, bss->cbss.bssid, beacon_int, 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, struct ieee80211_mgmt *mgmt, size_t len, struct ieee80211_rx_status *rx_status, struct ieee802_11_elems *elems, bool beacon) { struct ieee80211_local *local = sdata->local; int freq; struct ieee80211_bss *bss; struct sta_info *sta; struct ieee80211_channel *channel; u64 beacon_timestamp, rx_timestamp; u32 supp_rates = 0; enum ieee80211_band band = rx_status->band; if (elems->ds_params && elems->ds_params_len == 1) freq = ieee80211_channel_to_frequency(elems->ds_params[0]); else freq = rx_status->freq; channel = ieee80211_get_channel(local->hw.wiphy, freq); if (!channel || channel->flags & IEEE80211_CHAN_DISABLED) return; if (sdata->vif.type == NL80211_IFTYPE_ADHOC && elems->supp_rates && memcmp(mgmt->bssid, sdata->u.ibss.bssid, ETH_ALEN) == 0) { supp_rates = ieee80211_sta_get_rates(local, elems, band); rcu_read_lock(); sta = sta_info_get(local, mgmt->sa); if (sta) { u32 prev_rates; prev_rates = sta->sta.supp_rates[band]; /* make sure mandatory rates are always added */ sta->sta.supp_rates[band] = supp_rates | ieee80211_mandatory_rates(local, band); #ifdef CONFIG_MAC80211_IBSS_DEBUG if (sta->sta.supp_rates[band] != prev_rates) printk(KERN_DEBUG "%s: updated supp_rates set " "for %pM based on beacon info (0x%llx | " "0x%llx -> 0x%llx)\n", sdata->dev->name, sta->sta.addr, (unsigned long long) prev_rates, (unsigned long long) supp_rates, (unsigned long long) sta->sta.supp_rates[band]); #endif } else ieee80211_ibss_add_sta(sdata, mgmt->bssid, mgmt->sa, supp_rates); rcu_read_unlock(); } bss = ieee80211_bss_info_update(local, rx_status, mgmt, len, elems, channel, beacon); if (!bss) return; /* was just updated in ieee80211_bss_info_update */ beacon_timestamp = bss->cbss.tsf; /* check if we need to merge IBSS */ /* merge only on beacons (???) */ if (!beacon) goto put_bss; /* we use a fixed BSSID */ if (sdata->u.ibss.bssid) goto put_bss; /* not an IBSS */ if (!(bss->cbss.capability & WLAN_CAPABILITY_IBSS)) goto put_bss; /* different channel */ if (bss->cbss.channel != local->oper_channel) goto put_bss; /* different SSID */ if (elems->ssid_len != sdata->u.ibss.ssid_len || memcmp(elems->ssid, sdata->u.ibss.ssid, sdata->u.ibss.ssid_len)) goto put_bss; /* same BSSID */ if (memcmp(bss->cbss.bssid, sdata->u.ibss.bssid, ETH_ALEN) == 0) goto put_bss; if (rx_status->flag & RX_FLAG_TSFT) { /* * For correct IBSS merging we need mactime; since mactime is * defined as the time the first data symbol of the frame hits * the PHY, and the timestamp of the beacon is defined as "the * time that the data symbol containing the first bit of the * timestamp is transmitted to the PHY plus the transmitting * STA's delays through its local PHY from the MAC-PHY * interface to its interface with the WM" (802.11 11.1.2) * - equals the time this bit arrives at the receiver - we have * to take into account the offset between the two. * * E.g. at 1 MBit that means mactime is 192 usec earlier * (=24 bytes * 8 usecs/byte) than the beacon timestamp. */ int rate; if (rx_status->flag & RX_FLAG_HT) rate = 65; /* TODO: HT rates */ else rate = local->hw.wiphy->bands[band]-> bitrates[rx_status->rate_idx].bitrate; rx_timestamp = rx_status->mactime + (24 * 8 * 10 / rate); } else if (local && local->ops && local->ops->get_tsf) /* second best option: get current TSF */ rx_timestamp = local->ops->get_tsf(local_to_hw(local)); else /* can't merge without knowing the TSF */ rx_timestamp = -1LLU; #ifdef CONFIG_MAC80211_IBSS_DEBUG printk(KERN_DEBUG "RX beacon SA=%pM BSSID=" "%pM TSF=0x%llx BCN=0x%llx diff=%lld @%lu\n", mgmt->sa, mgmt->bssid, (unsigned long long)rx_timestamp, (unsigned long long)beacon_timestamp, (unsigned long long)(rx_timestamp - beacon_timestamp), jiffies); #endif /* give slow hardware some time to do the TSF sync */ if (rx_timestamp < IEEE80211_IBSS_MERGE_DELAY) goto put_bss; if (beacon_timestamp > rx_timestamp) { #ifdef CONFIG_MAC80211_IBSS_DEBUG printk(KERN_DEBUG "%s: beacon TSF higher than " "local TSF - IBSS merge with BSSID %pM\n", sdata->dev->name, mgmt->bssid); #endif ieee80211_sta_join_ibss(sdata, bss); ieee80211_ibss_add_sta(sdata, mgmt->bssid, mgmt->sa, supp_rates); } put_bss: ieee80211_rx_bss_put(local, bss); } /* * Add a new IBSS station, will also be called by the RX code when, * in IBSS mode, receiving a frame from a yet-unknown station, hence * must be callable in atomic context. */ struct sta_info *ieee80211_ibss_add_sta(struct ieee80211_sub_if_data *sdata, u8 *bssid,u8 *addr, u32 supp_rates) { struct ieee80211_local *local = sdata->local; struct sta_info *sta; int band = local->hw.conf.channel->band; /* * 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); return NULL; } if (compare_ether_addr(bssid, sdata->u.ibss.bssid)) return NULL; #ifdef CONFIG_MAC80211_VERBOSE_DEBUG printk(KERN_DEBUG "%s: Adding new IBSS station %pM (dev=%s)\n", wiphy_name(local->hw.wiphy), addr, sdata->dev->name); #endif sta = sta_info_alloc(sdata, addr, GFP_ATOMIC); if (!sta) return NULL; set_sta_flags(sta, WLAN_STA_AUTHORIZED); /* make sure mandatory rates are always added */ sta->sta.supp_rates[band] = supp_rates | ieee80211_mandatory_rates(local, band); rate_control_rate_init(sta); if (sta_info_insert(sta)) return NULL; return sta; } static int ieee80211_sta_active_ibss(struct ieee80211_sub_if_data *sdata) { struct ieee80211_local *local = sdata->local; int active = 0; struct sta_info *sta; rcu_read_lock(); list_for_each_entry_rcu(sta, &local->sta_list, list) { if (sta->sdata == sdata && time_after(sta->last_rx + IEEE80211_IBSS_MERGE_INTERVAL, jiffies)) { active++; break; } } rcu_read_unlock(); return active; } static void ieee80211_sta_merge_ibss(struct ieee80211_sub_if_data *sdata) { struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 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->fixed_channel) return; printk(KERN_DEBUG "%s: No active IBSS STAs - trying to scan for other " "IBSS networks with same SSID (merge)\n", sdata->dev->name); ieee80211_request_internal_scan(sdata, ifibss->ssid, ifibss->ssid_len); } 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; struct ieee80211_supported_band *sband; u8 *pos; u8 bssid[ETH_ALEN]; u8 supp_rates[IEEE80211_MAX_SUPP_RATES]; u16 capability; int i; if (ifibss->fixed_bssid) { memcpy(bssid, ifibss->bssid, ETH_ALEN); } else { /* Generate random, not broadcast, locally administered BSSID. Mix in * own MAC address to make sure that devices that do not have proper * random number generator get different BSSID. */ get_random_bytes(bssid, ETH_ALEN); for (i = 0; i < ETH_ALEN; i++) bssid[i] ^= sdata->dev->dev_addr[i]; bssid[0] &= ~0x01; bssid[0] |= 0x02; } printk(KERN_DEBUG "%s: Creating new IBSS network, BSSID %pM\n", sdata->dev->name, bssid); sband = local->hw.wiphy->bands[ifibss->channel->band]; capability = WLAN_CAPABILITY_IBSS; if (sdata->default_key) capability |= WLAN_CAPABILITY_PRIVACY; else sdata->drop_unencrypted = 0; pos = supp_rates; for (i = 0; i < sband->n_bitrates; i++) { int rate = sband->bitrates[i].bitrate; *pos++ = (u8) (rate / 5); } __ieee80211_sta_join_ibss(sdata, bssid, sdata->vif.bss_conf.beacon_int, ifibss->channel, sband->n_bitrates, supp_rates, capability, 0); } 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; active_ibss = ieee80211_sta_active_ibss(sdata); #ifdef CONFIG_MAC80211_IBSS_DEBUG printk(KERN_DEBUG "%s: sta_find_ibss (active_ibss=%d)\n", sdata->dev->name, active_ibss); #endif /* CONFIG_MAC80211_IBSS_DEBUG */ if (active_ibss) return; 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, chan, bssid, ifibss->ssid, ifibss->ssid_len, WLAN_CAPABILITY_IBSS, WLAN_CAPABILITY_IBSS); #ifdef CONFIG_MAC80211_IBSS_DEBUG if (bss) printk(KERN_DEBUG " sta_find_ibss: selected %pM current " "%pM\n", bss->cbss.bssid, ifibss->bssid); #endif /* CONFIG_MAC80211_IBSS_DEBUG */ 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); ieee80211_sta_join_ibss(sdata, bss); ieee80211_rx_bss_put(local, bss); return; } else if (bss) ieee80211_rx_bss_put(local, bss); #ifdef CONFIG_MAC80211_IBSS_DEBUG printk(KERN_DEBUG " did not try to join ibss\n"); #endif /* CONFIG_MAC80211_IBSS_DEBUG */ /* 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, 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); ieee80211_request_internal_scan(sdata, ifibss->ssid, ifibss->ssid_len); } 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)) { 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); /* No IBSS found - decrease scan interval and continue * scanning. */ interval = IEEE80211_SCAN_INTERVAL_SLOW; } ifibss->state = IEEE80211_IBSS_MLME_SEARCH; mod_timer(&ifibss->timer, round_jiffies(jiffies + interval)); } } static void ieee80211_rx_mgmt_probe_req(struct ieee80211_sub_if_data *sdata, struct ieee80211_mgmt *mgmt, size_t len) { struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; struct ieee80211_local *local = sdata->local; int tx_last_beacon; struct sk_buff *skb; struct ieee80211_mgmt *resp; u8 *pos, *end; if (ifibss->state != IEEE80211_IBSS_MLME_JOINED || len < 24 + 2 || !ifibss->presp) return; if (local->ops->tx_last_beacon) tx_last_beacon = local->ops->tx_last_beacon(local_to_hw(local)); else tx_last_beacon = 1; #ifdef CONFIG_MAC80211_IBSS_DEBUG printk(KERN_DEBUG "%s: RX ProbeReq SA=%pM DA=%pM BSSID=%pM" " (tx_last_beacon=%d)\n", sdata->dev->name, mgmt->sa, mgmt->da, mgmt->bssid, tx_last_beacon); #endif /* CONFIG_MAC80211_IBSS_DEBUG */ if (!tx_last_beacon) return; if (memcmp(mgmt->bssid, ifibss->bssid, ETH_ALEN) != 0 && memcmp(mgmt->bssid, "\xff\xff\xff\xff\xff\xff", ETH_ALEN) != 0) return; end = ((u8 *) mgmt) + len; pos = mgmt->u.probe_req.variable; if (pos[0] != WLAN_EID_SSID || pos + 2 + pos[1] > end) { #ifdef CONFIG_MAC80211_IBSS_DEBUG printk(KERN_DEBUG "%s: Invalid SSID IE in ProbeReq " "from %pM\n", sdata->dev->name, mgmt->sa); #endif return; } if (pos[1] != 0 && (pos[1] != ifibss->ssid_len || !memcmp(pos + 2, ifibss->ssid, ifibss->ssid_len))) { /* Ignore ProbeReq for foreign SSID */ return; } /* Reply with ProbeResp */ skb = skb_copy(ifibss->presp, GFP_KERNEL); if (!skb) return; resp = (struct ieee80211_mgmt *) skb->data; memcpy(resp->da, mgmt->sa, ETH_ALEN); #ifdef CONFIG_MAC80211_IBSS_DEBUG printk(KERN_DEBUG "%s: Sending ProbeResp to %pM\n", sdata->dev->name, resp->da); #endif /* CONFIG_MAC80211_IBSS_DEBUG */ ieee80211_tx_skb(sdata, skb, 0); } static void ieee80211_rx_mgmt_probe_resp(struct ieee80211_sub_if_data *sdata, struct ieee80211_mgmt *mgmt, size_t len, struct ieee80211_rx_status *rx_status) { size_t baselen; struct ieee802_11_elems elems; if (memcmp(mgmt->da, sdata->dev->dev_addr, ETH_ALEN)) return; /* ignore ProbeResp to foreign address */ baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt; if (baselen > len) return; ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen, &elems); ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems, false); } static void ieee80211_rx_mgmt_beacon(struct ieee80211_sub_if_data *sdata, struct ieee80211_mgmt *mgmt, size_t len, struct ieee80211_rx_status *rx_status) { size_t baselen; struct ieee802_11_elems elems; /* Process beacon from the current BSS */ baselen = (u8 *) mgmt->u.beacon.variable - (u8 *) mgmt; if (baselen > len) return; ieee802_11_parse_elems(mgmt->u.beacon.variable, len - baselen, &elems); ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems, true); } static void ieee80211_ibss_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata, struct sk_buff *skb) { struct ieee80211_rx_status *rx_status; struct ieee80211_mgmt *mgmt; u16 fc; rx_status = (struct ieee80211_rx_status *) skb->cb; mgmt = (struct ieee80211_mgmt *) skb->data; fc = le16_to_cpu(mgmt->frame_control); switch (fc & IEEE80211_FCTL_STYPE) { case IEEE80211_STYPE_PROBE_REQ: ieee80211_rx_mgmt_probe_req(sdata, mgmt, skb->len); break; case IEEE80211_STYPE_PROBE_RESP: ieee80211_rx_mgmt_probe_resp(sdata, mgmt, skb->len, rx_status); break; case IEEE80211_STYPE_BEACON: ieee80211_rx_mgmt_beacon(sdata, mgmt, skb->len, rx_status); break; case IEEE80211_STYPE_AUTH: ieee80211_rx_mgmt_auth_ibss(sdata, mgmt, skb->len); break; } kfree_skb(skb); } static void ieee80211_ibss_work(struct work_struct *work) { struct ieee80211_sub_if_data *sdata = container_of(work, struct ieee80211_sub_if_data, u.ibss.work); struct ieee80211_local *local = sdata->local; struct ieee80211_if_ibss *ifibss; struct sk_buff *skb; if (!netif_running(sdata->dev)) return; if (local->sw_scanning || local->hw_scanning) return; if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_ADHOC)) return; ifibss = &sdata->u.ibss; while ((skb = skb_dequeue(&ifibss->skb_queue))) ieee80211_ibss_rx_queued_mgmt(sdata, skb); if (!test_and_clear_bit(IEEE80211_IBSS_REQ_RUN, &ifibss->request)) return; switch (ifibss->state) { case IEEE80211_IBSS_MLME_SEARCH: ieee80211_sta_find_ibss(sdata); break; case IEEE80211_IBSS_MLME_JOINED: ieee80211_sta_merge_ibss(sdata); break; default: WARN_ON(1); break; } } static void ieee80211_ibss_timer(unsigned long data) { struct ieee80211_sub_if_data *sdata = (struct ieee80211_sub_if_data *) data; struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; struct ieee80211_local *local = sdata->local; set_bit(IEEE80211_IBSS_REQ_RUN, &ifibss->request); queue_work(local->hw.workqueue, &ifibss->work); } void ieee80211_ibss_setup_sdata(struct ieee80211_sub_if_data *sdata) { struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; INIT_WORK(&ifibss->work, ieee80211_ibss_work); setup_timer(&ifibss->timer, ieee80211_ibss_timer, (unsigned long) sdata); skb_queue_head_init(&ifibss->skb_queue); } /* scan finished notification */ void ieee80211_ibss_notify_scan_completed(struct ieee80211_local *local) { struct ieee80211_sub_if_data *sdata; mutex_lock(&local->iflist_mtx); list_for_each_entry(sdata, &local->interfaces, list) { if (!netif_running(sdata->dev)) continue; if (sdata->vif.type != NL80211_IFTYPE_ADHOC) continue; if (!sdata->u.ibss.ssid_len) continue; sdata->u.ibss.last_scan_completed = jiffies; ieee80211_sta_find_ibss(sdata); } mutex_unlock(&local->iflist_mtx); } ieee80211_rx_result ieee80211_ibss_rx_mgmt(struct ieee80211_sub_if_data *sdata, struct sk_buff *skb, struct ieee80211_rx_status *rx_status) { struct ieee80211_local *local = sdata->local; struct ieee80211_mgmt *mgmt; u16 fc; if (skb->len < 24) return RX_DROP_MONITOR; mgmt = (struct ieee80211_mgmt *) skb->data; fc = le16_to_cpu(mgmt->frame_control); switch (fc & IEEE80211_FCTL_STYPE) { case IEEE80211_STYPE_PROBE_RESP: case IEEE80211_STYPE_BEACON: memcpy(skb->cb, rx_status, sizeof(*rx_status)); case IEEE80211_STYPE_PROBE_REQ: case IEEE80211_STYPE_AUTH: skb_queue_tail(&sdata->u.ibss.skb_queue, skb); queue_work(local->hw.workqueue, &sdata->u.ibss.work); return RX_QUEUED; } return RX_DROP_MONITOR; } int ieee80211_ibss_join(struct ieee80211_sub_if_data *sdata, struct cfg80211_ibss_params *params) { struct sk_buff *skb; 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->vif.bss_conf.beacon_int = params->beacon_interval; 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; memcpy(sdata->u.ibss.ssid, params->ssid, IEEE80211_MAX_SSID_LEN); /* * The ssid_len setting below is used to see whether * we are active, and we need all other settings * before that may get visible. */ mb(); sdata->u.ibss.ssid_len = params->ssid_len; 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; }