![Johannes Berg](/assets/img/avatar_default.png)
For bluetooth 3, we will most likely not have a netdev for a virtual interface (sdata), so prepare for that by reducing the reliance on having a netdev. This patch moves the name and address fields into the sdata struct and uses them from there all over. Some work is needed to keep them sync'ed, but that's not a lot of work and in slow paths anyway. In doing so, this also reduces the number of pointer dereferences in many places, because of things like sdata->dev->dev_addr becoming sdata->vif.addr. Signed-off-by: Johannes Berg <johannes@sipsolutions.net> Signed-off-by: John W. Linville <linville@tuxdriver.com>
952 lines
26 KiB
C
952 lines
26 KiB
C
/*
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* IBSS mode implementation
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* Copyright 2003-2008, Jouni Malinen <j@w1.fi>
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* Copyright 2004, Instant802 Networks, Inc.
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* Copyright 2005, Devicescape Software, Inc.
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* Copyright 2006-2007 Jiri Benc <jbenc@suse.cz>
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* Copyright 2007, Michael Wu <flamingice@sourmilk.net>
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* Copyright 2009, Johannes Berg <johannes@sipsolutions.net>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#include <linux/delay.h>
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#include <linux/if_ether.h>
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#include <linux/skbuff.h>
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#include <linux/if_arp.h>
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#include <linux/etherdevice.h>
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#include <linux/rtnetlink.h>
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#include <net/mac80211.h>
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#include <asm/unaligned.h>
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#include "ieee80211_i.h"
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#include "driver-ops.h"
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#include "rate.h"
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#define IEEE80211_SCAN_INTERVAL (2 * HZ)
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#define IEEE80211_SCAN_INTERVAL_SLOW (15 * HZ)
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#define IEEE80211_IBSS_JOIN_TIMEOUT (7 * HZ)
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#define IEEE80211_IBSS_MERGE_INTERVAL (30 * HZ)
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#define IEEE80211_IBSS_MERGE_DELAY 0x400000
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#define IEEE80211_IBSS_INACTIVITY_LIMIT (60 * HZ)
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#define IEEE80211_IBSS_MAX_STA_ENTRIES 128
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static void ieee80211_rx_mgmt_auth_ibss(struct ieee80211_sub_if_data *sdata,
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struct ieee80211_mgmt *mgmt,
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size_t len)
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{
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u16 auth_alg, auth_transaction, status_code;
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if (len < 24 + 6)
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return;
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auth_alg = le16_to_cpu(mgmt->u.auth.auth_alg);
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auth_transaction = le16_to_cpu(mgmt->u.auth.auth_transaction);
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status_code = le16_to_cpu(mgmt->u.auth.status_code);
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/*
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* IEEE 802.11 standard does not require authentication in IBSS
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* networks and most implementations do not seem to use it.
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* However, try to reply to authentication attempts if someone
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* has actually implemented this.
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*/
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if (auth_alg == WLAN_AUTH_OPEN && auth_transaction == 1)
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ieee80211_send_auth(sdata, 2, WLAN_AUTH_OPEN, NULL, 0,
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sdata->u.ibss.bssid, NULL, 0, 0);
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}
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static void __ieee80211_sta_join_ibss(struct ieee80211_sub_if_data *sdata,
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const u8 *bssid, const int beacon_int,
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struct ieee80211_channel *chan,
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const u32 basic_rates,
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const u16 capability, u64 tsf)
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{
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struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
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struct ieee80211_local *local = sdata->local;
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int rates, i;
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struct sk_buff *skb;
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struct ieee80211_mgmt *mgmt;
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u8 *pos;
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struct ieee80211_supported_band *sband;
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struct cfg80211_bss *bss;
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u32 bss_change;
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u8 supp_rates[IEEE80211_MAX_SUPP_RATES];
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/* Reset own TSF to allow time synchronization work. */
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drv_reset_tsf(local);
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skb = ifibss->skb;
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rcu_assign_pointer(ifibss->presp, NULL);
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synchronize_rcu();
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skb->data = skb->head;
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skb->len = 0;
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skb_reset_tail_pointer(skb);
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skb_reserve(skb, sdata->local->hw.extra_tx_headroom);
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if (memcmp(ifibss->bssid, bssid, ETH_ALEN))
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sta_info_flush(sdata->local, sdata);
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memcpy(ifibss->bssid, bssid, ETH_ALEN);
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sdata->drop_unencrypted = capability & WLAN_CAPABILITY_PRIVACY ? 1 : 0;
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local->oper_channel = chan;
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local->oper_channel_type = NL80211_CHAN_NO_HT;
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ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_CHANNEL);
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sband = local->hw.wiphy->bands[chan->band];
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/* build supported rates array */
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pos = supp_rates;
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for (i = 0; i < sband->n_bitrates; i++) {
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int rate = sband->bitrates[i].bitrate;
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u8 basic = 0;
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if (basic_rates & BIT(i))
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basic = 0x80;
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*pos++ = basic | (u8) (rate / 5);
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}
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/* Build IBSS probe response */
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mgmt = (void *) skb_put(skb, 24 + sizeof(mgmt->u.beacon));
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memset(mgmt, 0, 24 + sizeof(mgmt->u.beacon));
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mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
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IEEE80211_STYPE_PROBE_RESP);
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memset(mgmt->da, 0xff, ETH_ALEN);
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memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
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memcpy(mgmt->bssid, ifibss->bssid, ETH_ALEN);
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mgmt->u.beacon.beacon_int = cpu_to_le16(beacon_int);
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mgmt->u.beacon.timestamp = cpu_to_le64(tsf);
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mgmt->u.beacon.capab_info = cpu_to_le16(capability);
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pos = skb_put(skb, 2 + ifibss->ssid_len);
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*pos++ = WLAN_EID_SSID;
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*pos++ = ifibss->ssid_len;
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memcpy(pos, ifibss->ssid, ifibss->ssid_len);
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rates = sband->n_bitrates;
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if (rates > 8)
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rates = 8;
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pos = skb_put(skb, 2 + rates);
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*pos++ = WLAN_EID_SUPP_RATES;
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*pos++ = rates;
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memcpy(pos, supp_rates, rates);
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if (sband->band == IEEE80211_BAND_2GHZ) {
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pos = skb_put(skb, 2 + 1);
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*pos++ = WLAN_EID_DS_PARAMS;
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*pos++ = 1;
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*pos++ = ieee80211_frequency_to_channel(chan->center_freq);
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}
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pos = skb_put(skb, 2 + 2);
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*pos++ = WLAN_EID_IBSS_PARAMS;
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*pos++ = 2;
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/* FIX: set ATIM window based on scan results */
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*pos++ = 0;
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*pos++ = 0;
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if (sband->n_bitrates > 8) {
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rates = sband->n_bitrates - 8;
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pos = skb_put(skb, 2 + rates);
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*pos++ = WLAN_EID_EXT_SUPP_RATES;
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*pos++ = rates;
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memcpy(pos, &supp_rates[8], rates);
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}
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if (ifibss->ie_len)
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memcpy(skb_put(skb, ifibss->ie_len),
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ifibss->ie, ifibss->ie_len);
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rcu_assign_pointer(ifibss->presp, skb);
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sdata->vif.bss_conf.beacon_int = beacon_int;
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bss_change = BSS_CHANGED_BEACON_INT;
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bss_change |= ieee80211_reset_erp_info(sdata);
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bss_change |= BSS_CHANGED_BSSID;
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bss_change |= BSS_CHANGED_BEACON;
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bss_change |= BSS_CHANGED_BEACON_ENABLED;
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ieee80211_bss_info_change_notify(sdata, bss_change);
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ieee80211_sta_def_wmm_params(sdata, sband->n_bitrates, supp_rates);
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ifibss->state = IEEE80211_IBSS_MLME_JOINED;
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mod_timer(&ifibss->timer,
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round_jiffies(jiffies + IEEE80211_IBSS_MERGE_INTERVAL));
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bss = cfg80211_inform_bss_frame(local->hw.wiphy, local->hw.conf.channel,
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mgmt, skb->len, 0, GFP_KERNEL);
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cfg80211_put_bss(bss);
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cfg80211_ibss_joined(sdata->dev, ifibss->bssid, GFP_KERNEL);
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}
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static void ieee80211_sta_join_ibss(struct ieee80211_sub_if_data *sdata,
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struct ieee80211_bss *bss)
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{
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struct ieee80211_supported_band *sband;
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u32 basic_rates;
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int i, j;
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u16 beacon_int = bss->cbss.beacon_interval;
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if (beacon_int < 10)
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beacon_int = 10;
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sband = sdata->local->hw.wiphy->bands[bss->cbss.channel->band];
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basic_rates = 0;
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for (i = 0; i < bss->supp_rates_len; i++) {
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int rate = (bss->supp_rates[i] & 0x7f) * 5;
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bool is_basic = !!(bss->supp_rates[i] & 0x80);
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for (j = 0; j < sband->n_bitrates; j++) {
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if (sband->bitrates[j].bitrate == rate) {
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if (is_basic)
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basic_rates |= BIT(j);
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break;
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}
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}
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}
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__ieee80211_sta_join_ibss(sdata, bss->cbss.bssid,
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beacon_int,
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bss->cbss.channel,
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basic_rates,
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bss->cbss.capability,
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bss->cbss.tsf);
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}
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static void ieee80211_rx_bss_info(struct ieee80211_sub_if_data *sdata,
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struct ieee80211_mgmt *mgmt,
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size_t len,
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struct ieee80211_rx_status *rx_status,
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struct ieee802_11_elems *elems,
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bool beacon)
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{
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struct ieee80211_local *local = sdata->local;
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int freq;
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struct ieee80211_bss *bss;
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struct sta_info *sta;
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struct ieee80211_channel *channel;
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u64 beacon_timestamp, rx_timestamp;
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u32 supp_rates = 0;
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enum ieee80211_band band = rx_status->band;
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if (elems->ds_params && elems->ds_params_len == 1)
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freq = ieee80211_channel_to_frequency(elems->ds_params[0]);
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else
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freq = rx_status->freq;
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channel = ieee80211_get_channel(local->hw.wiphy, freq);
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if (!channel || channel->flags & IEEE80211_CHAN_DISABLED)
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return;
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if (sdata->vif.type == NL80211_IFTYPE_ADHOC && elems->supp_rates &&
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memcmp(mgmt->bssid, sdata->u.ibss.bssid, ETH_ALEN) == 0) {
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supp_rates = ieee80211_sta_get_rates(local, elems, band);
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rcu_read_lock();
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sta = sta_info_get(sdata, mgmt->sa);
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if (sta) {
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u32 prev_rates;
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prev_rates = sta->sta.supp_rates[band];
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/* make sure mandatory rates are always added */
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sta->sta.supp_rates[band] = supp_rates |
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ieee80211_mandatory_rates(local, band);
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#ifdef CONFIG_MAC80211_IBSS_DEBUG
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if (sta->sta.supp_rates[band] != prev_rates)
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printk(KERN_DEBUG "%s: updated supp_rates set "
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"for %pM based on beacon info (0x%llx | "
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"0x%llx -> 0x%llx)\n",
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sdata->name,
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sta->sta.addr,
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(unsigned long long) prev_rates,
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(unsigned long long) supp_rates,
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(unsigned long long) sta->sta.supp_rates[band]);
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#endif
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} else
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ieee80211_ibss_add_sta(sdata, mgmt->bssid, mgmt->sa, supp_rates);
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rcu_read_unlock();
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}
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bss = ieee80211_bss_info_update(local, rx_status, mgmt, len, elems,
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channel, beacon);
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if (!bss)
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return;
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/* was just updated in ieee80211_bss_info_update */
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beacon_timestamp = bss->cbss.tsf;
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/* check if we need to merge IBSS */
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/* merge only on beacons (???) */
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if (!beacon)
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goto put_bss;
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/* we use a fixed BSSID */
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if (sdata->u.ibss.bssid)
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goto put_bss;
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/* not an IBSS */
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if (!(bss->cbss.capability & WLAN_CAPABILITY_IBSS))
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goto put_bss;
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/* different channel */
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if (bss->cbss.channel != local->oper_channel)
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goto put_bss;
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/* different SSID */
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if (elems->ssid_len != sdata->u.ibss.ssid_len ||
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memcmp(elems->ssid, sdata->u.ibss.ssid,
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sdata->u.ibss.ssid_len))
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goto put_bss;
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/* same BSSID */
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if (memcmp(bss->cbss.bssid, sdata->u.ibss.bssid, ETH_ALEN) == 0)
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goto put_bss;
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if (rx_status->flag & RX_FLAG_TSFT) {
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/*
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* For correct IBSS merging we need mactime; since mactime is
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* defined as the time the first data symbol of the frame hits
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* the PHY, and the timestamp of the beacon is defined as "the
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* time that the data symbol containing the first bit of the
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* timestamp is transmitted to the PHY plus the transmitting
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* STA's delays through its local PHY from the MAC-PHY
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* interface to its interface with the WM" (802.11 11.1.2)
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* - equals the time this bit arrives at the receiver - we have
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* to take into account the offset between the two.
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*
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* E.g. at 1 MBit that means mactime is 192 usec earlier
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* (=24 bytes * 8 usecs/byte) than the beacon timestamp.
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*/
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int rate;
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if (rx_status->flag & RX_FLAG_HT)
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rate = 65; /* TODO: HT rates */
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else
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rate = local->hw.wiphy->bands[band]->
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bitrates[rx_status->rate_idx].bitrate;
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rx_timestamp = rx_status->mactime + (24 * 8 * 10 / rate);
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} else {
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/*
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* second best option: get current TSF
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* (will return -1 if not supported)
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*/
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rx_timestamp = drv_get_tsf(local);
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}
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#ifdef CONFIG_MAC80211_IBSS_DEBUG
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printk(KERN_DEBUG "RX beacon SA=%pM BSSID="
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"%pM TSF=0x%llx BCN=0x%llx diff=%lld @%lu\n",
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mgmt->sa, mgmt->bssid,
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(unsigned long long)rx_timestamp,
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(unsigned long long)beacon_timestamp,
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(unsigned long long)(rx_timestamp - beacon_timestamp),
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jiffies);
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#endif
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/* give slow hardware some time to do the TSF sync */
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if (rx_timestamp < IEEE80211_IBSS_MERGE_DELAY)
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goto put_bss;
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if (beacon_timestamp > rx_timestamp) {
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#ifdef CONFIG_MAC80211_IBSS_DEBUG
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printk(KERN_DEBUG "%s: beacon TSF higher than "
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"local TSF - IBSS merge with BSSID %pM\n",
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sdata->name, mgmt->bssid);
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#endif
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ieee80211_sta_join_ibss(sdata, bss);
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ieee80211_ibss_add_sta(sdata, mgmt->bssid, mgmt->sa, supp_rates);
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}
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put_bss:
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ieee80211_rx_bss_put(local, bss);
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}
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/*
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* Add a new IBSS station, will also be called by the RX code when,
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* in IBSS mode, receiving a frame from a yet-unknown station, hence
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* must be callable in atomic context.
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*/
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struct sta_info *ieee80211_ibss_add_sta(struct ieee80211_sub_if_data *sdata,
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u8 *bssid,u8 *addr, u32 supp_rates)
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{
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struct ieee80211_local *local = sdata->local;
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struct sta_info *sta;
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int band = local->hw.conf.channel->band;
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/*
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* XXX: Consider removing the least recently used entry and
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* allow new one to be added.
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*/
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if (local->num_sta >= IEEE80211_IBSS_MAX_STA_ENTRIES) {
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if (net_ratelimit())
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printk(KERN_DEBUG "%s: No room for a new IBSS STA entry %pM\n",
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sdata->name, addr);
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return NULL;
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}
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if (compare_ether_addr(bssid, sdata->u.ibss.bssid))
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return NULL;
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#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
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printk(KERN_DEBUG "%s: Adding new IBSS station %pM (dev=%s)\n",
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wiphy_name(local->hw.wiphy), addr, sdata->name);
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#endif
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sta = sta_info_alloc(sdata, addr, GFP_ATOMIC);
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if (!sta)
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return NULL;
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set_sta_flags(sta, WLAN_STA_AUTHORIZED);
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/* make sure mandatory rates are always added */
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sta->sta.supp_rates[band] = supp_rates |
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ieee80211_mandatory_rates(local, band);
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rate_control_rate_init(sta);
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if (sta_info_insert(sta))
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return NULL;
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return sta;
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}
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static int ieee80211_sta_active_ibss(struct ieee80211_sub_if_data *sdata)
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{
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struct ieee80211_local *local = sdata->local;
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int active = 0;
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struct sta_info *sta;
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rcu_read_lock();
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list_for_each_entry_rcu(sta, &local->sta_list, list) {
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if (sta->sdata == sdata &&
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time_after(sta->last_rx + IEEE80211_IBSS_MERGE_INTERVAL,
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jiffies)) {
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active++;
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break;
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}
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}
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rcu_read_unlock();
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return active;
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}
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static void ieee80211_sta_merge_ibss(struct ieee80211_sub_if_data *sdata)
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{
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struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
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mod_timer(&ifibss->timer,
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round_jiffies(jiffies + IEEE80211_IBSS_MERGE_INTERVAL));
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ieee80211_sta_expire(sdata, IEEE80211_IBSS_INACTIVITY_LIMIT);
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if (time_before(jiffies, ifibss->last_scan_completed +
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IEEE80211_IBSS_MERGE_INTERVAL))
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return;
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|
|
|
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->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 bssid[ETH_ALEN];
|
|
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->vif.addr[i];
|
|
bssid[0] &= ~0x01;
|
|
bssid[0] |= 0x02;
|
|
}
|
|
|
|
printk(KERN_DEBUG "%s: Creating new IBSS network, BSSID %pM\n",
|
|
sdata->name, bssid);
|
|
|
|
sband = local->hw.wiphy->bands[ifibss->channel->band];
|
|
|
|
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->channel, 3, /* first two are basic */
|
|
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;
|
|
u16 capability;
|
|
|
|
active_ibss = ieee80211_sta_active_ibss(sdata);
|
|
#ifdef CONFIG_MAC80211_IBSS_DEBUG
|
|
printk(KERN_DEBUG "%s: sta_find_ibss (active_ibss=%d)\n",
|
|
sdata->name, active_ibss);
|
|
#endif /* CONFIG_MAC80211_IBSS_DEBUG */
|
|
|
|
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->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_PRIVACY,
|
|
capability);
|
|
|
|
if (bss) {
|
|
#ifdef CONFIG_MAC80211_IBSS_DEBUG
|
|
printk(KERN_DEBUG " sta_find_ibss: selected %pM current "
|
|
"%pM\n", bss->cbss.bssid, ifibss->bssid);
|
|
#endif /* CONFIG_MAC80211_IBSS_DEBUG */
|
|
|
|
printk(KERN_DEBUG "%s: Selected IBSS BSSID %pM"
|
|
" based on configured SSID\n",
|
|
sdata->name, bss->cbss.bssid);
|
|
|
|
ieee80211_sta_join_ibss(sdata, bss);
|
|
ieee80211_rx_bss_put(local, bss);
|
|
return;
|
|
}
|
|
|
|
#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->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->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;
|
|
|
|
tx_last_beacon = drv_tx_last_beacon(local);
|
|
|
|
#ifdef CONFIG_MAC80211_IBSS_DEBUG
|
|
printk(KERN_DEBUG "%s: RX ProbeReq SA=%pM DA=%pM BSSID=%pM"
|
|
" (tx_last_beacon=%d)\n",
|
|
sdata->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->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->name, resp->da);
|
|
#endif /* CONFIG_MAC80211_IBSS_DEBUG */
|
|
IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
|
|
ieee80211_tx_skb(sdata, skb);
|
|
}
|
|
|
|
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->vif.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 = IEEE80211_SKB_RXCB(skb);
|
|
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 (WARN_ON(local->suspended))
|
|
return;
|
|
|
|
if (!netif_running(sdata->dev))
|
|
return;
|
|
|
|
if (local->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;
|
|
|
|
if (local->quiescing) {
|
|
ifibss->timer_running = true;
|
|
return;
|
|
}
|
|
|
|
set_bit(IEEE80211_IBSS_REQ_RUN, &ifibss->request);
|
|
ieee80211_queue_work(&local->hw, &ifibss->work);
|
|
}
|
|
|
|
#ifdef CONFIG_PM
|
|
void ieee80211_ibss_quiesce(struct ieee80211_sub_if_data *sdata)
|
|
{
|
|
struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
|
|
|
|
cancel_work_sync(&ifibss->work);
|
|
if (del_timer_sync(&ifibss->timer))
|
|
ifibss->timer_running = true;
|
|
}
|
|
|
|
void ieee80211_ibss_restart(struct ieee80211_sub_if_data *sdata)
|
|
{
|
|
struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
|
|
|
|
if (ifibss->timer_running) {
|
|
add_timer(&ifibss->timer);
|
|
ifibss->timer_running = false;
|
|
}
|
|
}
|
|
#endif
|
|
|
|
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;
|
|
mod_timer(&sdata->u.ibss.timer, 0);
|
|
}
|
|
mutex_unlock(&local->iflist_mtx);
|
|
}
|
|
|
|
ieee80211_rx_result
|
|
ieee80211_ibss_rx_mgmt(struct ieee80211_sub_if_data *sdata, struct sk_buff *skb)
|
|
{
|
|
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:
|
|
case IEEE80211_STYPE_PROBE_REQ:
|
|
case IEEE80211_STYPE_AUTH:
|
|
skb_queue_tail(&sdata->u.ibss.skb_queue, skb);
|
|
ieee80211_queue_work(&local->hw, &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->u.ibss.privacy = params->privacy;
|
|
|
|
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;
|
|
|
|
ieee80211_recalc_idle(sdata->local);
|
|
|
|
set_bit(IEEE80211_IBSS_REQ_RUN, &sdata->u.ibss.request);
|
|
ieee80211_queue_work(&sdata->local->hw, &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_bss_info_change_notify(sdata, BSS_CHANGED_BEACON_ENABLED);
|
|
synchronize_rcu();
|
|
kfree_skb(skb);
|
|
|
|
skb_queue_purge(&sdata->u.ibss.skb_queue);
|
|
memset(sdata->u.ibss.bssid, 0, ETH_ALEN);
|
|
sdata->u.ibss.ssid_len = 0;
|
|
|
|
ieee80211_recalc_idle(sdata->local);
|
|
|
|
return 0;
|
|
}
|