| /* |
| * IBSS mode implementation |
| * Copyright 2003-2008, Jouni Malinen <j@w1.fi> |
| * Copyright 2004, Instant802 Networks, Inc. |
| * Copyright 2005, Devicescape Software, Inc. |
| * Copyright 2006-2007 Jiri Benc <jbenc@suse.cz> |
| * Copyright 2007, Michael Wu <flamingice@sourmilk.net> |
| * Copyright 2009, Johannes Berg <johannes@sipsolutions.net> |
| * |
| * 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 <linux/delay.h> |
| #include <linux/if_ether.h> |
| #include <linux/skbuff.h> |
| #include <linux/if_arp.h> |
| #include <linux/etherdevice.h> |
| #include <linux/rtnetlink.h> |
| #include <net/mac80211.h> |
| #include <asm/unaligned.h> |
| |
| #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_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 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) |
| { |
| struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; |
| struct ieee80211_local *local = sdata->local; |
| int res = 0, 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 = 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); |
| } |
| |
| 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); |
| |
| if (res) |
| return res; |
| |
| sband = local->hw.wiphy->bands[local->hw.conf.channel->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)); |
| 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.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(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); |
| } |
| |
| ifibss->probe_resp = 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->flags |= IEEE80211_IBSS_PREV_BSSID_SET; |
| ifibss->state = IEEE80211_IBSS_MLME_JOINED; |
| mod_timer(&ifibss->timer, 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; |
| } |
| |
| static int 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); |
| } |
| |
| 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.flags & IEEE80211_IBSS_BSSID_SET) |
| 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; |
| |
| 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 |
| |
| 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; |
| |
| /* TODO: Could 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, 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))) |
| return; |
| |
| printk(KERN_DEBUG "%s: No active IBSS STAs - trying to scan for other " |
| "IBSS networks with same SSID (merge)\n", sdata->dev->name); |
| |
| /* XXX maybe racy? */ |
| if (sdata->local->scan_req) |
| return; |
| |
| memcpy(sdata->local->int_scan_req.ssids[0].ssid, |
| ifibss->ssid, IEEE80211_MAX_SSID_LEN); |
| sdata->local->int_scan_req.ssids[0].ssid_len = ifibss->ssid_len; |
| ieee80211_request_scan(sdata, &sdata->local->int_scan_req); |
| } |
| |
| static int 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->flags & IEEE80211_IBSS_BSSID_SET) { |
| 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[local->hw.conf.channel->band]; |
| |
| if (local->hw.conf.beacon_int == 0) |
| local->hw.conf.beacon_int = 100; |
| |
| 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); |
| } |
| |
| return __ieee80211_sta_join_ibss(sdata, |
| bssid, local->hw.conf.beacon_int, |
| local->hw.conf.channel->center_freq, |
| sband->n_bitrates, supp_rates, |
| capability); |
| } |
| |
| static int 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; |
| 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", |
| sdata->dev->name, active_ibss); |
| #endif /* CONFIG_MAC80211_IBSS_DEBUG */ |
| |
| if (active_ibss) |
| return 0; |
| |
| if (ifibss->flags & IEEE80211_IBSS_BSSID_SET) |
| bssid = ifibss->bssid; |
| bss = (void *)cfg80211_get_bss(local->hw.wiphy, NULL, 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 && |
| (!(ifibss->flags & IEEE80211_IBSS_PREV_BSSID_SET) || |
| memcmp(ifibss->bssid, bss->cbss.bssid, ETH_ALEN))) { |
| int ret; |
| |
| 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_rx_bss_put(local, bss); |
| return ret; |
| } 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, jiffies + |
| IEEE80211_IBSS_MERGE_INTERVAL); |
| } else if (time_after(jiffies, local->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; |
| |
| 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); |
| } 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); |
| 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, jiffies + interval); |
| return 0; |
| } |
| |
| return 0; |
| } |
| |
| 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->probe_resp) |
| 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) != 0)) { |
| /* Ignore ProbeReq for foreign SSID */ |
| return; |
| } |
| |
| /* Reply with ProbeResp */ |
| skb = skb_copy(ifibss->probe_resp, 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); |
| |
| ifibss->flags |= IEEE80211_IBSS_AUTO_BSSID_SEL | |
| IEEE80211_IBSS_AUTO_CHANNEL_SEL; |
| } |
| |
| 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; |
| } |
| |
| ifibss->flags &= ~IEEE80211_IBSS_PREV_BSSID_SET; |
| |
| if (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; |
| return ieee80211_sta_find_ibss(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_set_ssid(sdata, ifibss->ssid, ifibss->ssid_len); |
| } |
| |
| /* 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; |
| |
| 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); |
| } |
| } |
| |
| 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; |
| } |