| /* |
| * 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/slab.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 "ieee80211_i.h" |
| #include "driver-ops.h" |
| #include "rate.h" |
| |
| #define IEEE80211_SCAN_INTERVAL (2 * 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_sta_join_ibss(struct ieee80211_sub_if_data *sdata, |
| const u8 *bssid, const int beacon_int, |
| struct ieee80211_channel *chan, |
| const u32 basic_rates, |
| const u16 capability, u64 tsf, |
| bool creator) |
| { |
| struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; |
| struct ieee80211_local *local = sdata->local; |
| int rates_n = 0, i, ri; |
| struct ieee80211_mgmt *mgmt; |
| u8 *pos; |
| struct ieee80211_supported_band *sband; |
| struct cfg80211_bss *bss; |
| u32 bss_change, rate_flags, rates = 0, rates_added = 0; |
| u8 supp_rates[IEEE80211_MAX_SUPP_RATES]; |
| struct cfg80211_chan_def chandef; |
| struct beacon_data *presp; |
| int frame_len; |
| int shift; |
| |
| sdata_assert_lock(sdata); |
| |
| /* Reset own TSF to allow time synchronization work. */ |
| drv_reset_tsf(local, sdata); |
| |
| if (!ether_addr_equal(ifibss->bssid, bssid)) |
| sta_info_flush(sdata); |
| |
| /* if merging, indicate to driver that we leave the old IBSS */ |
| if (sdata->vif.bss_conf.ibss_joined) { |
| sdata->vif.bss_conf.ibss_joined = false; |
| sdata->vif.bss_conf.ibss_creator = false; |
| sdata->vif.bss_conf.enable_beacon = false; |
| netif_carrier_off(sdata->dev); |
| ieee80211_bss_info_change_notify(sdata, |
| BSS_CHANGED_IBSS | |
| BSS_CHANGED_BEACON_ENABLED); |
| } |
| |
| presp = rcu_dereference_protected(ifibss->presp, |
| lockdep_is_held(&sdata->wdev.mtx)); |
| rcu_assign_pointer(ifibss->presp, NULL); |
| if (presp) |
| kfree_rcu(presp, rcu_head); |
| |
| sdata->drop_unencrypted = capability & WLAN_CAPABILITY_PRIVACY ? 1 : 0; |
| |
| chandef = ifibss->chandef; |
| if (!cfg80211_reg_can_beacon(local->hw.wiphy, &chandef)) { |
| chandef.width = NL80211_CHAN_WIDTH_20; |
| chandef.center_freq1 = chan->center_freq; |
| } |
| |
| ieee80211_vif_release_channel(sdata); |
| if (ieee80211_vif_use_channel(sdata, &chandef, |
| ifibss->fixed_channel ? |
| IEEE80211_CHANCTX_SHARED : |
| IEEE80211_CHANCTX_EXCLUSIVE)) { |
| sdata_info(sdata, "Failed to join IBSS, no channel context\n"); |
| return; |
| } |
| |
| memcpy(ifibss->bssid, bssid, ETH_ALEN); |
| |
| sband = local->hw.wiphy->bands[chan->band]; |
| shift = ieee80211_vif_get_shift(&sdata->vif); |
| |
| /* Build IBSS probe response */ |
| frame_len = sizeof(struct ieee80211_hdr_3addr) + |
| 12 /* struct ieee80211_mgmt.u.beacon */ + |
| 2 + IEEE80211_MAX_SSID_LEN /* max SSID */ + |
| 2 + 8 /* max Supported Rates */ + |
| 3 /* max DS params */ + |
| 4 /* IBSS params */ + |
| 2 + (IEEE80211_MAX_SUPP_RATES - 8) + |
| 2 + sizeof(struct ieee80211_ht_cap) + |
| 2 + sizeof(struct ieee80211_ht_operation) + |
| ifibss->ie_len; |
| presp = kzalloc(sizeof(*presp) + frame_len, GFP_KERNEL); |
| if (!presp) |
| return; |
| |
| presp->head = (void *)(presp + 1); |
| |
| mgmt = (void *) presp->head; |
| mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | |
| IEEE80211_STYPE_PROBE_RESP); |
| eth_broadcast_addr(mgmt->da); |
| memcpy(mgmt->sa, sdata->vif.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 = (u8 *)mgmt + offsetof(struct ieee80211_mgmt, u.beacon.variable); |
| |
| *pos++ = WLAN_EID_SSID; |
| *pos++ = ifibss->ssid_len; |
| memcpy(pos, ifibss->ssid, ifibss->ssid_len); |
| pos += ifibss->ssid_len; |
| |
| rate_flags = ieee80211_chandef_rate_flags(&chandef); |
| for (i = 0; i < sband->n_bitrates; i++) { |
| if ((rate_flags & sband->bitrates[i].flags) != rate_flags) |
| continue; |
| |
| rates |= BIT(i); |
| rates_n++; |
| } |
| |
| *pos++ = WLAN_EID_SUPP_RATES; |
| *pos++ = min_t(int, 8, rates_n); |
| for (ri = 0; ri < sband->n_bitrates; ri++) { |
| int rate = DIV_ROUND_UP(sband->bitrates[ri].bitrate, |
| 5 * (1 << shift)); |
| u8 basic = 0; |
| if (!(rates & BIT(ri))) |
| continue; |
| |
| if (basic_rates & BIT(ri)) |
| basic = 0x80; |
| *pos++ = basic | (u8) rate; |
| if (++rates_added == 8) |
| break; |
| } |
| |
| if (sband->band == IEEE80211_BAND_2GHZ) { |
| *pos++ = WLAN_EID_DS_PARAMS; |
| *pos++ = 1; |
| *pos++ = ieee80211_frequency_to_channel(chan->center_freq); |
| } |
| |
| *pos++ = WLAN_EID_IBSS_PARAMS; |
| *pos++ = 2; |
| /* FIX: set ATIM window based on scan results */ |
| *pos++ = 0; |
| *pos++ = 0; |
| |
| /* put the remaining rates in WLAN_EID_EXT_SUPP_RATES */ |
| if (rates_n > 8) { |
| *pos++ = WLAN_EID_EXT_SUPP_RATES; |
| *pos++ = rates_n - 8; |
| for (; ri < sband->n_bitrates; ri++) { |
| int rate = DIV_ROUND_UP(sband->bitrates[ri].bitrate, |
| 5 * (1 << shift)); |
| u8 basic = 0; |
| if (!(rates & BIT(ri))) |
| continue; |
| |
| if (basic_rates & BIT(ri)) |
| basic = 0x80; |
| *pos++ = basic | (u8) rate; |
| } |
| } |
| |
| if (ifibss->ie_len) { |
| memcpy(pos, ifibss->ie, ifibss->ie_len); |
| pos += ifibss->ie_len; |
| } |
| |
| /* add HT capability and information IEs */ |
| if (chandef.width != NL80211_CHAN_WIDTH_20_NOHT && |
| chandef.width != NL80211_CHAN_WIDTH_5 && |
| chandef.width != NL80211_CHAN_WIDTH_10 && |
| sband->ht_cap.ht_supported) { |
| struct ieee80211_sta_ht_cap ht_cap; |
| |
| memcpy(&ht_cap, &sband->ht_cap, sizeof(ht_cap)); |
| ieee80211_apply_htcap_overrides(sdata, &ht_cap); |
| |
| pos = ieee80211_ie_build_ht_cap(pos, &ht_cap, ht_cap.cap); |
| /* |
| * Note: According to 802.11n-2009 9.13.3.1, HT Protection |
| * field and RIFS Mode are reserved in IBSS mode, therefore |
| * keep them at 0 |
| */ |
| pos = ieee80211_ie_build_ht_oper(pos, &sband->ht_cap, |
| &chandef, 0); |
| } |
| |
| if (local->hw.queues >= IEEE80211_NUM_ACS) { |
| *pos++ = WLAN_EID_VENDOR_SPECIFIC; |
| *pos++ = 7; /* len */ |
| *pos++ = 0x00; /* Microsoft OUI 00:50:F2 */ |
| *pos++ = 0x50; |
| *pos++ = 0xf2; |
| *pos++ = 2; /* WME */ |
| *pos++ = 0; /* WME info */ |
| *pos++ = 1; /* WME ver */ |
| *pos++ = 0; /* U-APSD no in use */ |
| } |
| |
| presp->head_len = pos - presp->head; |
| if (WARN_ON(presp->head_len > frame_len)) |
| return; |
| |
| rcu_assign_pointer(ifibss->presp, presp); |
| |
| sdata->vif.bss_conf.enable_beacon = true; |
| sdata->vif.bss_conf.beacon_int = beacon_int; |
| sdata->vif.bss_conf.basic_rates = basic_rates; |
| sdata->vif.bss_conf.ssid_len = ifibss->ssid_len; |
| memcpy(sdata->vif.bss_conf.ssid, ifibss->ssid, ifibss->ssid_len); |
| bss_change = BSS_CHANGED_BEACON_INT; |
| bss_change |= ieee80211_reset_erp_info(sdata); |
| bss_change |= BSS_CHANGED_BSSID; |
| bss_change |= BSS_CHANGED_BEACON; |
| bss_change |= BSS_CHANGED_BEACON_ENABLED; |
| bss_change |= BSS_CHANGED_BASIC_RATES; |
| bss_change |= BSS_CHANGED_HT; |
| bss_change |= BSS_CHANGED_IBSS; |
| bss_change |= BSS_CHANGED_SSID; |
| |
| /* |
| * In 5 GHz/802.11a, we can always use short slot time. |
| * (IEEE 802.11-2012 18.3.8.7) |
| * |
| * In 2.4GHz, we must always use long slots in IBSS for compatibility |
| * reasons. |
| * (IEEE 802.11-2012 19.4.5) |
| * |
| * HT follows these specifications (IEEE 802.11-2012 20.3.18) |
| */ |
| sdata->vif.bss_conf.use_short_slot = chan->band == IEEE80211_BAND_5GHZ; |
| bss_change |= BSS_CHANGED_ERP_SLOT; |
| |
| sdata->vif.bss_conf.ibss_joined = true; |
| sdata->vif.bss_conf.ibss_creator = creator; |
| ieee80211_bss_info_change_notify(sdata, bss_change); |
| |
| ieee80211_sta_def_wmm_params(sdata, rates, supp_rates); |
| |
| ifibss->state = IEEE80211_IBSS_MLME_JOINED; |
| mod_timer(&ifibss->timer, |
| round_jiffies(jiffies + IEEE80211_IBSS_MERGE_INTERVAL)); |
| |
| bss = cfg80211_inform_bss_frame(local->hw.wiphy, chan, |
| mgmt, presp->head_len, 0, GFP_KERNEL); |
| cfg80211_put_bss(local->hw.wiphy, bss); |
| netif_carrier_on(sdata->dev); |
| 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) |
| { |
| struct cfg80211_bss *cbss = |
| container_of((void *)bss, struct cfg80211_bss, priv); |
| struct ieee80211_supported_band *sband; |
| u32 basic_rates; |
| int i, j; |
| u16 beacon_int = cbss->beacon_interval; |
| const struct cfg80211_bss_ies *ies; |
| u64 tsf; |
| u32 rate_flags; |
| int shift; |
| |
| sdata_assert_lock(sdata); |
| |
| if (beacon_int < 10) |
| beacon_int = 10; |
| |
| sband = sdata->local->hw.wiphy->bands[cbss->channel->band]; |
| rate_flags = ieee80211_chandef_rate_flags(&sdata->u.ibss.chandef); |
| shift = ieee80211_vif_get_shift(&sdata->vif); |
| |
| basic_rates = 0; |
| |
| for (i = 0; i < bss->supp_rates_len; i++) { |
| int rate = bss->supp_rates[i] & 0x7f; |
| bool is_basic = !!(bss->supp_rates[i] & 0x80); |
| |
| for (j = 0; j < sband->n_bitrates; j++) { |
| int brate; |
| if ((rate_flags & sband->bitrates[j].flags) |
| != rate_flags) |
| continue; |
| |
| brate = DIV_ROUND_UP(sband->bitrates[j].bitrate, |
| 5 * (1 << shift)); |
| if (brate == rate) { |
| if (is_basic) |
| basic_rates |= BIT(j); |
| break; |
| } |
| } |
| } |
| |
| rcu_read_lock(); |
| ies = rcu_dereference(cbss->ies); |
| tsf = ies->tsf; |
| rcu_read_unlock(); |
| |
| __ieee80211_sta_join_ibss(sdata, cbss->bssid, |
| beacon_int, |
| cbss->channel, |
| basic_rates, |
| cbss->capability, |
| tsf, false); |
| } |
| |
| static struct sta_info *ieee80211_ibss_finish_sta(struct sta_info *sta) |
| __acquires(RCU) |
| { |
| struct ieee80211_sub_if_data *sdata = sta->sdata; |
| u8 addr[ETH_ALEN]; |
| |
| memcpy(addr, sta->sta.addr, ETH_ALEN); |
| |
| ibss_dbg(sdata, "Adding new IBSS station %pM\n", addr); |
| |
| sta_info_pre_move_state(sta, IEEE80211_STA_AUTH); |
| sta_info_pre_move_state(sta, IEEE80211_STA_ASSOC); |
| /* authorize the station only if the network is not RSN protected. If |
| * not wait for the userspace to authorize it */ |
| if (!sta->sdata->u.ibss.control_port) |
| sta_info_pre_move_state(sta, IEEE80211_STA_AUTHORIZED); |
| |
| rate_control_rate_init(sta); |
| |
| /* If it fails, maybe we raced another insertion? */ |
| if (sta_info_insert_rcu(sta)) |
| return sta_info_get(sdata, addr); |
| return sta; |
| } |
| |
| static struct sta_info * |
| ieee80211_ibss_add_sta(struct ieee80211_sub_if_data *sdata, const u8 *bssid, |
| const u8 *addr, u32 supp_rates) |
| __acquires(RCU) |
| { |
| struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; |
| struct ieee80211_local *local = sdata->local; |
| struct sta_info *sta; |
| struct ieee80211_chanctx_conf *chanctx_conf; |
| struct ieee80211_supported_band *sband; |
| int 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) { |
| net_info_ratelimited("%s: No room for a new IBSS STA entry %pM\n", |
| sdata->name, addr); |
| rcu_read_lock(); |
| return NULL; |
| } |
| |
| if (ifibss->state == IEEE80211_IBSS_MLME_SEARCH) { |
| rcu_read_lock(); |
| return NULL; |
| } |
| |
| if (!ether_addr_equal(bssid, sdata->u.ibss.bssid)) { |
| rcu_read_lock(); |
| return NULL; |
| } |
| |
| rcu_read_lock(); |
| chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); |
| if (WARN_ON_ONCE(!chanctx_conf)) |
| return NULL; |
| band = chanctx_conf->def.chan->band; |
| rcu_read_unlock(); |
| |
| sta = sta_info_alloc(sdata, addr, GFP_KERNEL); |
| if (!sta) { |
| rcu_read_lock(); |
| return NULL; |
| } |
| |
| sta->last_rx = jiffies; |
| |
| /* make sure mandatory rates are always added */ |
| sband = local->hw.wiphy->bands[band]; |
| sta->sta.supp_rates[band] = supp_rates | |
| ieee80211_mandatory_rates(sband); |
| |
| return ieee80211_ibss_finish_sta(sta); |
| } |
| |
| static void ieee80211_rx_mgmt_deauth_ibss(struct ieee80211_sub_if_data *sdata, |
| struct ieee80211_mgmt *mgmt, |
| size_t len) |
| { |
| u16 reason = le16_to_cpu(mgmt->u.deauth.reason_code); |
| |
| if (len < IEEE80211_DEAUTH_FRAME_LEN) |
| return; |
| |
| ibss_dbg(sdata, "RX DeAuth SA=%pM DA=%pM BSSID=%pM (reason: %d)\n", |
| mgmt->sa, mgmt->da, mgmt->bssid, reason); |
| sta_info_destroy_addr(sdata, mgmt->sa); |
| } |
| |
| 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; |
| |
| sdata_assert_lock(sdata); |
| |
| 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); |
| |
| ibss_dbg(sdata, |
| "RX Auth SA=%pM DA=%pM BSSID=%pM (auth_transaction=%d)\n", |
| mgmt->sa, mgmt->da, mgmt->bssid, auth_transaction); |
| |
| if (auth_alg != WLAN_AUTH_OPEN || auth_transaction != 1) |
| return; |
| |
| /* |
| * 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. |
| */ |
| ieee80211_send_auth(sdata, 2, WLAN_AUTH_OPEN, 0, NULL, 0, |
| mgmt->sa, sdata->u.ibss.bssid, NULL, 0, 0, 0); |
| } |
| |
| 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) |
| { |
| struct ieee80211_local *local = sdata->local; |
| int freq; |
| struct cfg80211_bss *cbss; |
| 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; |
| struct ieee80211_supported_band *sband = local->hw.wiphy->bands[band]; |
| bool rates_updated = false; |
| |
| if (elems->ds_params) |
| freq = ieee80211_channel_to_frequency(elems->ds_params[0], |
| band); |
| 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 && |
| ether_addr_equal(mgmt->bssid, sdata->u.ibss.bssid)) { |
| |
| rcu_read_lock(); |
| sta = sta_info_get(sdata, mgmt->sa); |
| |
| if (elems->supp_rates) { |
| supp_rates = ieee80211_sta_get_rates(sdata, elems, |
| band, NULL); |
| 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(sband); |
| |
| if (sta->sta.supp_rates[band] != prev_rates) { |
| ibss_dbg(sdata, |
| "updated supp_rates set for %pM based on beacon/probe_resp (0x%x -> 0x%x)\n", |
| sta->sta.addr, prev_rates, |
| sta->sta.supp_rates[band]); |
| rates_updated = true; |
| } |
| } else { |
| rcu_read_unlock(); |
| sta = ieee80211_ibss_add_sta(sdata, mgmt->bssid, |
| mgmt->sa, supp_rates); |
| } |
| } |
| |
| if (sta && elems->wmm_info) |
| set_sta_flag(sta, WLAN_STA_WME); |
| |
| if (sta && elems->ht_operation && elems->ht_cap_elem && |
| sdata->u.ibss.chandef.width != NL80211_CHAN_WIDTH_20_NOHT && |
| sdata->u.ibss.chandef.width != NL80211_CHAN_WIDTH_5 && |
| sdata->u.ibss.chandef.width != NL80211_CHAN_WIDTH_10) { |
| /* we both use HT */ |
| struct ieee80211_ht_cap htcap_ie; |
| struct cfg80211_chan_def chandef; |
| |
| ieee80211_ht_oper_to_chandef(channel, |
| elems->ht_operation, |
| &chandef); |
| |
| memcpy(&htcap_ie, elems->ht_cap_elem, sizeof(htcap_ie)); |
| |
| /* |
| * fall back to HT20 if we don't use or use |
| * the other extension channel |
| */ |
| if (chandef.center_freq1 != |
| sdata->u.ibss.chandef.center_freq1) |
| htcap_ie.cap_info &= |
| cpu_to_le16(~IEEE80211_HT_CAP_SUP_WIDTH_20_40); |
| |
| rates_updated |= ieee80211_ht_cap_ie_to_sta_ht_cap( |
| sdata, sband, &htcap_ie, sta); |
| } |
| |
| if (sta && rates_updated) { |
| drv_sta_rc_update(local, sdata, &sta->sta, |
| IEEE80211_RC_SUPP_RATES_CHANGED); |
| rate_control_rate_init(sta); |
| } |
| |
| rcu_read_unlock(); |
| } |
| |
| bss = ieee80211_bss_info_update(local, rx_status, mgmt, len, elems, |
| channel); |
| if (!bss) |
| return; |
| |
| cbss = container_of((void *)bss, struct cfg80211_bss, priv); |
| |
| /* same for beacon and probe response */ |
| beacon_timestamp = le64_to_cpu(mgmt->u.beacon.timestamp); |
| |
| /* check if we need to merge IBSS */ |
| |
| /* we use a fixed BSSID */ |
| if (sdata->u.ibss.fixed_bssid) |
| goto put_bss; |
| |
| /* not an IBSS */ |
| if (!(cbss->capability & WLAN_CAPABILITY_IBSS)) |
| goto put_bss; |
| |
| /* different channel */ |
| if (sdata->u.ibss.fixed_channel && |
| sdata->u.ibss.chandef.chan != cbss->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 (ether_addr_equal(cbss->bssid, sdata->u.ibss.bssid)) |
| goto put_bss; |
| |
| if (ieee80211_have_rx_timestamp(rx_status)) { |
| /* time when timestamp field was received */ |
| rx_timestamp = |
| ieee80211_calculate_rx_timestamp(local, rx_status, |
| len + FCS_LEN, 24); |
| } else { |
| /* |
| * second best option: get current TSF |
| * (will return -1 if not supported) |
| */ |
| rx_timestamp = drv_get_tsf(local, sdata); |
| } |
| |
| ibss_dbg(sdata, |
| "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); |
| |
| if (beacon_timestamp > rx_timestamp) { |
| ibss_dbg(sdata, |
| "beacon TSF higher than local TSF - IBSS merge with BSSID %pM\n", |
| mgmt->bssid); |
| ieee80211_sta_join_ibss(sdata, bss); |
| supp_rates = ieee80211_sta_get_rates(sdata, elems, band, NULL); |
| ieee80211_ibss_add_sta(sdata, mgmt->bssid, mgmt->sa, |
| supp_rates); |
| rcu_read_unlock(); |
| } |
| |
| put_bss: |
| ieee80211_rx_bss_put(local, bss); |
| } |
| |
| void ieee80211_ibss_rx_no_sta(struct ieee80211_sub_if_data *sdata, |
| const u8 *bssid, const u8 *addr, |
| u32 supp_rates) |
| { |
| struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; |
| struct ieee80211_local *local = sdata->local; |
| struct sta_info *sta; |
| struct ieee80211_chanctx_conf *chanctx_conf; |
| struct ieee80211_supported_band *sband; |
| int 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) { |
| net_info_ratelimited("%s: No room for a new IBSS STA entry %pM\n", |
| sdata->name, addr); |
| return; |
| } |
| |
| if (ifibss->state == IEEE80211_IBSS_MLME_SEARCH) |
| return; |
| |
| if (!ether_addr_equal(bssid, sdata->u.ibss.bssid)) |
| return; |
| |
| rcu_read_lock(); |
| chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); |
| if (WARN_ON_ONCE(!chanctx_conf)) { |
| rcu_read_unlock(); |
| return; |
| } |
| band = chanctx_conf->def.chan->band; |
| rcu_read_unlock(); |
| |
| sta = sta_info_alloc(sdata, addr, GFP_ATOMIC); |
| if (!sta) |
| return; |
| |
| sta->last_rx = jiffies; |
| |
| /* make sure mandatory rates are always added */ |
| sband = local->hw.wiphy->bands[band]; |
| sta->sta.supp_rates[band] = supp_rates | |
| ieee80211_mandatory_rates(sband); |
| |
| spin_lock(&ifibss->incomplete_lock); |
| list_add(&sta->list, &ifibss->incomplete_stations); |
| spin_unlock(&ifibss->incomplete_lock); |
| ieee80211_queue_work(&local->hw, &sdata->work); |
| } |
| |
| 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; |
| |
| sdata_assert_lock(sdata); |
| |
| 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; |
| } |
| |
| /* |
| * This function is called with state == IEEE80211_IBSS_MLME_JOINED |
| */ |
| |
| static void ieee80211_sta_merge_ibss(struct ieee80211_sub_if_data *sdata) |
| { |
| struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; |
| |
| sdata_assert_lock(sdata); |
| |
| mod_timer(&ifibss->timer, |
| round_jiffies(jiffies + IEEE80211_IBSS_MERGE_INTERVAL)); |
| |
| ieee80211_sta_expire(sdata, IEEE80211_IBSS_INACTIVITY_LIMIT); |
| |
| if (time_before(jiffies, ifibss->last_scan_completed + |
| IEEE80211_IBSS_MERGE_INTERVAL)) |
| return; |
| |
| if (ieee80211_sta_active_ibss(sdata)) |
| return; |
| |
| if (ifibss->fixed_channel) |
| return; |
| |
| sdata_info(sdata, |
| "No active IBSS STAs - trying to scan for other IBSS networks with same SSID (merge)\n"); |
| |
| ieee80211_request_ibss_scan(sdata, ifibss->ssid, ifibss->ssid_len, |
| NULL); |
| } |
| |
| static void ieee80211_sta_create_ibss(struct ieee80211_sub_if_data *sdata) |
| { |
| struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; |
| u8 bssid[ETH_ALEN]; |
| u16 capability; |
| int i; |
| |
| sdata_assert_lock(sdata); |
| |
| 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->vif.addr[i]; |
| bssid[0] &= ~0x01; |
| bssid[0] |= 0x02; |
| } |
| |
| sdata_info(sdata, "Creating new IBSS network, BSSID %pM\n", bssid); |
| |
| capability = WLAN_CAPABILITY_IBSS; |
| |
| if (ifibss->privacy) |
| capability |= WLAN_CAPABILITY_PRIVACY; |
| else |
| sdata->drop_unencrypted = 0; |
| |
| __ieee80211_sta_join_ibss(sdata, bssid, sdata->vif.bss_conf.beacon_int, |
| ifibss->chandef.chan, ifibss->basic_rates, |
| capability, 0, true); |
| } |
| |
| /* |
| * This function is called with state == IEEE80211_IBSS_MLME_SEARCH |
| */ |
| |
| 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 cfg80211_bss *cbss; |
| struct ieee80211_channel *chan = NULL; |
| const u8 *bssid = NULL; |
| int active_ibss; |
| u16 capability; |
| |
| sdata_assert_lock(sdata); |
| |
| active_ibss = ieee80211_sta_active_ibss(sdata); |
| ibss_dbg(sdata, "sta_find_ibss (active_ibss=%d)\n", active_ibss); |
| |
| if (active_ibss) |
| return; |
| |
| capability = WLAN_CAPABILITY_IBSS; |
| if (ifibss->privacy) |
| capability |= WLAN_CAPABILITY_PRIVACY; |
| if (ifibss->fixed_bssid) |
| bssid = ifibss->bssid; |
| if (ifibss->fixed_channel) |
| chan = ifibss->chandef.chan; |
| if (!is_zero_ether_addr(ifibss->bssid)) |
| bssid = ifibss->bssid; |
| cbss = cfg80211_get_bss(local->hw.wiphy, chan, bssid, |
| ifibss->ssid, ifibss->ssid_len, |
| WLAN_CAPABILITY_IBSS | WLAN_CAPABILITY_PRIVACY, |
| capability); |
| |
| if (cbss) { |
| struct ieee80211_bss *bss; |
| |
| bss = (void *)cbss->priv; |
| ibss_dbg(sdata, |
| "sta_find_ibss: selected %pM current %pM\n", |
| cbss->bssid, ifibss->bssid); |
| sdata_info(sdata, |
| "Selected IBSS BSSID %pM based on configured SSID\n", |
| cbss->bssid); |
| |
| ieee80211_sta_join_ibss(sdata, bss); |
| ieee80211_rx_bss_put(local, bss); |
| return; |
| } |
| |
| ibss_dbg(sdata, "sta_find_ibss: did not try to join ibss\n"); |
| |
| /* Selected IBSS not found in current scan results - try to scan */ |
| if (time_after(jiffies, ifibss->last_scan_completed + |
| IEEE80211_SCAN_INTERVAL)) { |
| sdata_info(sdata, "Trigger new scan to find an IBSS to join\n"); |
| |
| ieee80211_request_ibss_scan(sdata, ifibss->ssid, |
| ifibss->ssid_len, chan); |
| } else { |
| int interval = IEEE80211_SCAN_INTERVAL; |
| |
| if (time_after(jiffies, ifibss->ibss_join_req + |
| IEEE80211_IBSS_JOIN_TIMEOUT)) |
| ieee80211_sta_create_ibss(sdata); |
| |
| mod_timer(&ifibss->timer, |
| round_jiffies(jiffies + interval)); |
| } |
| } |
| |
| static void ieee80211_rx_mgmt_probe_req(struct ieee80211_sub_if_data *sdata, |
| struct sk_buff *req) |
| { |
| struct ieee80211_mgmt *mgmt = (void *)req->data; |
| struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; |
| struct ieee80211_local *local = sdata->local; |
| int tx_last_beacon, len = req->len; |
| struct sk_buff *skb; |
| struct beacon_data *presp; |
| u8 *pos, *end; |
| |
| sdata_assert_lock(sdata); |
| |
| presp = rcu_dereference_protected(ifibss->presp, |
| lockdep_is_held(&sdata->wdev.mtx)); |
| |
| if (ifibss->state != IEEE80211_IBSS_MLME_JOINED || |
| len < 24 + 2 || !presp) |
| return; |
| |
| tx_last_beacon = drv_tx_last_beacon(local); |
| |
| ibss_dbg(sdata, |
| "RX ProbeReq SA=%pM DA=%pM BSSID=%pM (tx_last_beacon=%d)\n", |
| mgmt->sa, mgmt->da, mgmt->bssid, tx_last_beacon); |
| |
| if (!tx_last_beacon && is_multicast_ether_addr(mgmt->da)) |
| return; |
| |
| if (!ether_addr_equal(mgmt->bssid, ifibss->bssid) && |
| !is_broadcast_ether_addr(mgmt->bssid)) |
| return; |
| |
| end = ((u8 *) mgmt) + len; |
| pos = mgmt->u.probe_req.variable; |
| if (pos[0] != WLAN_EID_SSID || |
| pos + 2 + pos[1] > end) { |
| ibss_dbg(sdata, "Invalid SSID IE in ProbeReq from %pM\n", |
| mgmt->sa); |
| 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 = dev_alloc_skb(local->tx_headroom + presp->head_len); |
| if (!skb) |
| return; |
| |
| skb_reserve(skb, local->tx_headroom); |
| memcpy(skb_put(skb, presp->head_len), presp->head, presp->head_len); |
| |
| memcpy(((struct ieee80211_mgmt *) skb->data)->da, mgmt->sa, ETH_ALEN); |
| ibss_dbg(sdata, "Sending ProbeResp to %pM\n", mgmt->sa); |
| IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT; |
| ieee80211_tx_skb(sdata, skb); |
| } |
| |
| static |
| void ieee80211_rx_mgmt_probe_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; |
| |
| BUILD_BUG_ON(offsetof(typeof(mgmt->u.probe_resp), variable) != |
| offsetof(typeof(mgmt->u.beacon), variable)); |
| |
| /* |
| * either beacon or probe_resp but the variable field is at the |
| * same offset |
| */ |
| baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt; |
| if (baselen > len) |
| return; |
| |
| ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen, |
| false, &elems); |
| |
| ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems); |
| } |
| |
| 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 = IEEE80211_SKB_RXCB(skb); |
| mgmt = (struct ieee80211_mgmt *) skb->data; |
| fc = le16_to_cpu(mgmt->frame_control); |
| |
| sdata_lock(sdata); |
| |
| if (!sdata->u.ibss.ssid_len) |
| goto mgmt_out; /* not ready to merge yet */ |
| |
| switch (fc & IEEE80211_FCTL_STYPE) { |
| case IEEE80211_STYPE_PROBE_REQ: |
| ieee80211_rx_mgmt_probe_req(sdata, skb); |
| break; |
| case IEEE80211_STYPE_PROBE_RESP: |
| case IEEE80211_STYPE_BEACON: |
| ieee80211_rx_mgmt_probe_beacon(sdata, mgmt, skb->len, |
| rx_status); |
| break; |
| case IEEE80211_STYPE_AUTH: |
| ieee80211_rx_mgmt_auth_ibss(sdata, mgmt, skb->len); |
| break; |
| case IEEE80211_STYPE_DEAUTH: |
| ieee80211_rx_mgmt_deauth_ibss(sdata, mgmt, skb->len); |
| break; |
| } |
| |
| mgmt_out: |
| sdata_unlock(sdata); |
| } |
| |
| void ieee80211_ibss_work(struct ieee80211_sub_if_data *sdata) |
| { |
| struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; |
| struct sta_info *sta; |
| |
| sdata_lock(sdata); |
| |
| /* |
| * Work could be scheduled after scan or similar |
| * when we aren't even joined (or trying) with a |
| * network. |
| */ |
| if (!ifibss->ssid_len) |
| goto out; |
| |
| spin_lock_bh(&ifibss->incomplete_lock); |
| while (!list_empty(&ifibss->incomplete_stations)) { |
| sta = list_first_entry(&ifibss->incomplete_stations, |
| struct sta_info, list); |
| list_del(&sta->list); |
| spin_unlock_bh(&ifibss->incomplete_lock); |
| |
| ieee80211_ibss_finish_sta(sta); |
| rcu_read_unlock(); |
| spin_lock_bh(&ifibss->incomplete_lock); |
| } |
| spin_unlock_bh(&ifibss->incomplete_lock); |
| |
| 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; |
| } |
| |
| out: |
| sdata_unlock(sdata); |
| } |
| |
| static void ieee80211_ibss_timer(unsigned long data) |
| { |
| struct ieee80211_sub_if_data *sdata = |
| (struct ieee80211_sub_if_data *) data; |
| |
| ieee80211_queue_work(&sdata->local->hw, &sdata->work); |
| } |
| |
| void ieee80211_ibss_setup_sdata(struct ieee80211_sub_if_data *sdata) |
| { |
| struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; |
| |
| setup_timer(&ifibss->timer, ieee80211_ibss_timer, |
| (unsigned long) sdata); |
| INIT_LIST_HEAD(&ifibss->incomplete_stations); |
| spin_lock_init(&ifibss->incomplete_lock); |
| } |
| |
| /* 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 (!ieee80211_sdata_running(sdata)) |
| continue; |
| if (sdata->vif.type != NL80211_IFTYPE_ADHOC) |
| continue; |
| sdata->u.ibss.last_scan_completed = jiffies; |
| ieee80211_queue_work(&local->hw, &sdata->work); |
| } |
| mutex_unlock(&local->iflist_mtx); |
| } |
| |
| int ieee80211_ibss_join(struct ieee80211_sub_if_data *sdata, |
| struct cfg80211_ibss_params *params) |
| { |
| u32 changed = 0; |
| u32 rate_flags; |
| struct ieee80211_supported_band *sband; |
| int i; |
| |
| 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.privacy = params->privacy; |
| sdata->u.ibss.control_port = params->control_port; |
| sdata->u.ibss.basic_rates = params->basic_rates; |
| |
| /* fix basic_rates if channel does not support these rates */ |
| rate_flags = ieee80211_chandef_rate_flags(¶ms->chandef); |
| sband = sdata->local->hw.wiphy->bands[params->chandef.chan->band]; |
| for (i = 0; i < sband->n_bitrates; i++) { |
| if ((rate_flags & sband->bitrates[i].flags) != rate_flags) |
| sdata->u.ibss.basic_rates &= ~BIT(i); |
| } |
| memcpy(sdata->vif.bss_conf.mcast_rate, params->mcast_rate, |
| sizeof(params->mcast_rate)); |
| |
| sdata->vif.bss_conf.beacon_int = params->beacon_interval; |
| |
| sdata->u.ibss.chandef = params->chandef; |
| 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; |
| } |
| |
| sdata->u.ibss.state = IEEE80211_IBSS_MLME_SEARCH; |
| sdata->u.ibss.ibss_join_req = jiffies; |
| |
| memcpy(sdata->u.ibss.ssid, params->ssid, params->ssid_len); |
| sdata->u.ibss.ssid_len = params->ssid_len; |
| |
| memcpy(&sdata->u.ibss.ht_capa, ¶ms->ht_capa, |
| sizeof(sdata->u.ibss.ht_capa)); |
| memcpy(&sdata->u.ibss.ht_capa_mask, ¶ms->ht_capa_mask, |
| sizeof(sdata->u.ibss.ht_capa_mask)); |
| |
| /* |
| * 802.11n-2009 9.13.3.1: In an IBSS, the HT Protection field is |
| * reserved, but an HT STA shall protect HT transmissions as though |
| * the HT Protection field were set to non-HT mixed mode. |
| * |
| * In an IBSS, the RIFS Mode field of the HT Operation element is |
| * also reserved, but an HT STA shall operate as though this field |
| * were set to 1. |
| */ |
| |
| sdata->vif.bss_conf.ht_operation_mode |= |
| IEEE80211_HT_OP_MODE_PROTECTION_NONHT_MIXED |
| | IEEE80211_HT_PARAM_RIFS_MODE; |
| |
| changed |= BSS_CHANGED_HT; |
| ieee80211_bss_info_change_notify(sdata, changed); |
| |
| sdata->smps_mode = IEEE80211_SMPS_OFF; |
| sdata->needed_rx_chains = sdata->local->rx_chains; |
| |
| ieee80211_queue_work(&sdata->local->hw, &sdata->work); |
| |
| return 0; |
| } |
| |
| int ieee80211_ibss_leave(struct ieee80211_sub_if_data *sdata) |
| { |
| struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; |
| struct ieee80211_local *local = sdata->local; |
| struct cfg80211_bss *cbss; |
| u16 capability; |
| int active_ibss; |
| struct sta_info *sta; |
| struct beacon_data *presp; |
| |
| active_ibss = ieee80211_sta_active_ibss(sdata); |
| |
| if (!active_ibss && !is_zero_ether_addr(ifibss->bssid)) { |
| capability = WLAN_CAPABILITY_IBSS; |
| |
| if (ifibss->privacy) |
| capability |= WLAN_CAPABILITY_PRIVACY; |
| |
| cbss = cfg80211_get_bss(local->hw.wiphy, ifibss->chandef.chan, |
| ifibss->bssid, ifibss->ssid, |
| ifibss->ssid_len, WLAN_CAPABILITY_IBSS | |
| WLAN_CAPABILITY_PRIVACY, |
| capability); |
| |
| if (cbss) { |
| cfg80211_unlink_bss(local->hw.wiphy, cbss); |
| cfg80211_put_bss(local->hw.wiphy, cbss); |
| } |
| } |
| |
| ifibss->state = IEEE80211_IBSS_MLME_SEARCH; |
| memset(ifibss->bssid, 0, ETH_ALEN); |
| ifibss->ssid_len = 0; |
| |
| sta_info_flush(sdata); |
| |
| spin_lock_bh(&ifibss->incomplete_lock); |
| while (!list_empty(&ifibss->incomplete_stations)) { |
| sta = list_first_entry(&ifibss->incomplete_stations, |
| struct sta_info, list); |
| list_del(&sta->list); |
| spin_unlock_bh(&ifibss->incomplete_lock); |
| |
| sta_info_free(local, sta); |
| spin_lock_bh(&ifibss->incomplete_lock); |
| } |
| spin_unlock_bh(&ifibss->incomplete_lock); |
| |
| netif_carrier_off(sdata->dev); |
| |
| /* remove beacon */ |
| kfree(sdata->u.ibss.ie); |
| presp = rcu_dereference_protected(ifibss->presp, |
| lockdep_is_held(&sdata->wdev.mtx)); |
| RCU_INIT_POINTER(sdata->u.ibss.presp, NULL); |
| |
| /* on the next join, re-program HT parameters */ |
| memset(&ifibss->ht_capa, 0, sizeof(ifibss->ht_capa)); |
| memset(&ifibss->ht_capa_mask, 0, sizeof(ifibss->ht_capa_mask)); |
| |
| sdata->vif.bss_conf.ibss_joined = false; |
| sdata->vif.bss_conf.ibss_creator = false; |
| sdata->vif.bss_conf.enable_beacon = false; |
| sdata->vif.bss_conf.ssid_len = 0; |
| clear_bit(SDATA_STATE_OFFCHANNEL_BEACON_STOPPED, &sdata->state); |
| ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BEACON_ENABLED | |
| BSS_CHANGED_IBSS); |
| synchronize_rcu(); |
| kfree(presp); |
| |
| skb_queue_purge(&sdata->skb_queue); |
| |
| del_timer_sync(&sdata->u.ibss.timer); |
| |
| return 0; |
| } |