![Johannes Berg](/assets/img/avatar_default.png)
VHT introduces multiple IEs that need to be parsed for a wide bandwidth channel switch. Two are (currently) needed in mac80211: * wide bandwidth channel switch element * channel switch wrapper element The former is contained in the latter for beacons and probe responses, but not for the spectrum management action frames so the IE parser needs a new argument to differentiate them. Signed-off-by: Johannes Berg <johannes.berg@intel.com>
1180 lines
32 KiB
C
1180 lines
32 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/slab.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 "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_IBSS_JOIN_TIMEOUT (7 * HZ)
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#define IEEE80211_IBSS_MERGE_INTERVAL (30 * HZ)
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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_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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bool creator)
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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 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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struct cfg80211_chan_def chandef;
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struct beacon_data *presp;
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int frame_len;
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lockdep_assert_held(&ifibss->mtx);
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/* Reset own TSF to allow time synchronization work. */
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drv_reset_tsf(local, sdata);
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if (!ether_addr_equal(ifibss->bssid, bssid))
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sta_info_flush(sdata);
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/* if merging, indicate to driver that we leave the old IBSS */
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if (sdata->vif.bss_conf.ibss_joined) {
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sdata->vif.bss_conf.ibss_joined = false;
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sdata->vif.bss_conf.ibss_creator = false;
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sdata->vif.bss_conf.enable_beacon = false;
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netif_carrier_off(sdata->dev);
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ieee80211_bss_info_change_notify(sdata,
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BSS_CHANGED_IBSS |
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BSS_CHANGED_BEACON_ENABLED);
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}
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presp = rcu_dereference_protected(ifibss->presp,
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lockdep_is_held(&ifibss->mtx));
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rcu_assign_pointer(ifibss->presp, NULL);
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if (presp)
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kfree_rcu(presp, rcu_head);
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sdata->drop_unencrypted = capability & WLAN_CAPABILITY_PRIVACY ? 1 : 0;
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cfg80211_chandef_create(&chandef, chan, ifibss->channel_type);
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if (!cfg80211_reg_can_beacon(local->hw.wiphy, &chandef)) {
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chandef.width = NL80211_CHAN_WIDTH_20;
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chandef.center_freq1 = chan->center_freq;
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}
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ieee80211_vif_release_channel(sdata);
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if (ieee80211_vif_use_channel(sdata, &chandef,
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ifibss->fixed_channel ?
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IEEE80211_CHANCTX_SHARED :
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IEEE80211_CHANCTX_EXCLUSIVE)) {
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sdata_info(sdata, "Failed to join IBSS, no channel context\n");
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return;
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}
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memcpy(ifibss->bssid, bssid, ETH_ALEN);
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sband = local->hw.wiphy->bands[chan->band];
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/* Build IBSS probe response */
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frame_len = sizeof(struct ieee80211_hdr_3addr) +
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12 /* struct ieee80211_mgmt.u.beacon */ +
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2 + IEEE80211_MAX_SSID_LEN /* max SSID */ +
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2 + 8 /* max Supported Rates */ +
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3 /* max DS params */ +
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4 /* IBSS params */ +
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2 + (IEEE80211_MAX_SUPP_RATES - 8) +
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2 + sizeof(struct ieee80211_ht_cap) +
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2 + sizeof(struct ieee80211_ht_operation) +
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ifibss->ie_len;
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presp = kzalloc(sizeof(*presp) + frame_len, GFP_KERNEL);
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if (!presp)
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return;
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presp->head = (void *)(presp + 1);
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mgmt = (void *) presp->head;
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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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eth_broadcast_addr(mgmt->da);
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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 = (u8 *)mgmt + offsetof(struct ieee80211_mgmt, u.beacon.variable);
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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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pos += ifibss->ssid_len;
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rates = min_t(int, 8, sband->n_bitrates);
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*pos++ = WLAN_EID_SUPP_RATES;
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*pos++ = rates;
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for (i = 0; i < rates; 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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if (sband->band == IEEE80211_BAND_2GHZ) {
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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++ = 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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*pos++ = WLAN_EID_EXT_SUPP_RATES;
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*pos++ = sband->n_bitrates - 8;
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for (i = 8; 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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}
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if (ifibss->ie_len) {
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memcpy(pos, ifibss->ie, ifibss->ie_len);
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pos += ifibss->ie_len;
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}
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/* add HT capability and information IEs */
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if (chandef.width != NL80211_CHAN_WIDTH_20_NOHT &&
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sband->ht_cap.ht_supported) {
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pos = ieee80211_ie_build_ht_cap(pos, &sband->ht_cap,
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sband->ht_cap.cap);
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/*
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* Note: According to 802.11n-2009 9.13.3.1, HT Protection
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* field and RIFS Mode are reserved in IBSS mode, therefore
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* keep them at 0
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*/
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pos = ieee80211_ie_build_ht_oper(pos, &sband->ht_cap,
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&chandef, 0);
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}
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if (local->hw.queues >= IEEE80211_NUM_ACS) {
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*pos++ = WLAN_EID_VENDOR_SPECIFIC;
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*pos++ = 7; /* len */
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*pos++ = 0x00; /* Microsoft OUI 00:50:F2 */
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*pos++ = 0x50;
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*pos++ = 0xf2;
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*pos++ = 2; /* WME */
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*pos++ = 0; /* WME info */
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*pos++ = 1; /* WME ver */
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*pos++ = 0; /* U-APSD no in use */
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}
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presp->head_len = pos - presp->head;
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if (WARN_ON(presp->head_len > frame_len))
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return;
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rcu_assign_pointer(ifibss->presp, presp);
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sdata->vif.bss_conf.enable_beacon = true;
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sdata->vif.bss_conf.beacon_int = beacon_int;
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sdata->vif.bss_conf.basic_rates = basic_rates;
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sdata->vif.bss_conf.ssid_len = ifibss->ssid_len;
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memcpy(sdata->vif.bss_conf.ssid, ifibss->ssid, ifibss->ssid_len);
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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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bss_change |= BSS_CHANGED_BASIC_RATES;
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bss_change |= BSS_CHANGED_HT;
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bss_change |= BSS_CHANGED_IBSS;
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bss_change |= BSS_CHANGED_SSID;
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/*
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* In 5 GHz/802.11a, we can always use short slot time.
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* (IEEE 802.11-2012 18.3.8.7)
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*
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* In 2.4GHz, we must always use long slots in IBSS for compatibility
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* reasons.
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* (IEEE 802.11-2012 19.4.5)
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*
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* HT follows these specifications (IEEE 802.11-2012 20.3.18)
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*/
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sdata->vif.bss_conf.use_short_slot = chan->band == IEEE80211_BAND_5GHZ;
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bss_change |= BSS_CHANGED_ERP_SLOT;
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sdata->vif.bss_conf.ibss_joined = true;
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sdata->vif.bss_conf.ibss_creator = creator;
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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, chan,
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mgmt, presp->head_len, 0, GFP_KERNEL);
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cfg80211_put_bss(local->hw.wiphy, bss);
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netif_carrier_on(sdata->dev);
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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 cfg80211_bss *cbss =
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container_of((void *)bss, struct cfg80211_bss, priv);
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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 = cbss->beacon_interval;
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const struct cfg80211_bss_ies *ies;
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u64 tsf;
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lockdep_assert_held(&sdata->u.ibss.mtx);
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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[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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rcu_read_lock();
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ies = rcu_dereference(cbss->ies);
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tsf = ies->tsf;
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rcu_read_unlock();
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__ieee80211_sta_join_ibss(sdata, cbss->bssid,
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beacon_int,
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cbss->channel,
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basic_rates,
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cbss->capability,
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tsf, false);
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}
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static struct sta_info *ieee80211_ibss_finish_sta(struct sta_info *sta,
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bool auth)
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__acquires(RCU)
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{
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struct ieee80211_sub_if_data *sdata = sta->sdata;
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u8 addr[ETH_ALEN];
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memcpy(addr, sta->sta.addr, ETH_ALEN);
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ibss_dbg(sdata, "Adding new IBSS station %pM\n", addr);
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sta_info_pre_move_state(sta, IEEE80211_STA_AUTH);
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sta_info_pre_move_state(sta, IEEE80211_STA_ASSOC);
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/* authorize the station only if the network is not RSN protected. If
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* not wait for the userspace to authorize it */
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if (!sta->sdata->u.ibss.control_port)
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sta_info_pre_move_state(sta, IEEE80211_STA_AUTHORIZED);
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rate_control_rate_init(sta);
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/* If it fails, maybe we raced another insertion? */
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if (sta_info_insert_rcu(sta))
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return sta_info_get(sdata, addr);
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if (auth && !sdata->u.ibss.auth_frame_registrations) {
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ibss_dbg(sdata,
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"TX Auth SA=%pM DA=%pM BSSID=%pM (auth_transaction=1)\n",
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sdata->vif.addr, addr, sdata->u.ibss.bssid);
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ieee80211_send_auth(sdata, 1, WLAN_AUTH_OPEN, 0, NULL, 0,
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addr, sdata->u.ibss.bssid, NULL, 0, 0, 0);
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}
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return sta;
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}
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static struct sta_info *
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ieee80211_ibss_add_sta(struct ieee80211_sub_if_data *sdata,
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const u8 *bssid, const u8 *addr,
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u32 supp_rates, bool auth)
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__acquires(RCU)
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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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struct sta_info *sta;
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struct ieee80211_chanctx_conf *chanctx_conf;
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int 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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net_info_ratelimited("%s: No room for a new IBSS STA entry %pM\n",
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sdata->name, addr);
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rcu_read_lock();
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return NULL;
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}
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if (ifibss->state == IEEE80211_IBSS_MLME_SEARCH) {
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rcu_read_lock();
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return NULL;
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}
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if (!ether_addr_equal(bssid, sdata->u.ibss.bssid)) {
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rcu_read_lock();
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return NULL;
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}
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rcu_read_lock();
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chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
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if (WARN_ON_ONCE(!chanctx_conf))
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return NULL;
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band = chanctx_conf->def.chan->band;
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rcu_read_unlock();
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sta = sta_info_alloc(sdata, addr, GFP_KERNEL);
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if (!sta) {
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rcu_read_lock();
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return NULL;
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}
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sta->last_rx = jiffies;
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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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return ieee80211_ibss_finish_sta(sta, auth);
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}
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static void ieee80211_rx_mgmt_deauth_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 reason = le16_to_cpu(mgmt->u.deauth.reason_code);
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if (len < IEEE80211_DEAUTH_FRAME_LEN)
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return;
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ibss_dbg(sdata, "RX DeAuth SA=%pM DA=%pM BSSID=%pM (reason: %d)\n",
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mgmt->sa, mgmt->da, mgmt->bssid, reason);
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sta_info_destroy_addr(sdata, mgmt->sa);
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}
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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;
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struct sta_info *sta;
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u8 deauth_frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
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lockdep_assert_held(&sdata->u.ibss.mtx);
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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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ibss_dbg(sdata,
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"RX Auth SA=%pM DA=%pM BSSID=%pM (auth_transaction=%d)\n",
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mgmt->sa, mgmt->da, mgmt->bssid, auth_transaction);
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if (auth_alg != WLAN_AUTH_OPEN || auth_transaction != 1)
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return;
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sta_info_destroy_addr(sdata, mgmt->sa);
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sta = ieee80211_ibss_add_sta(sdata, mgmt->bssid, mgmt->sa, 0, false);
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rcu_read_unlock();
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/*
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* if we have any problem in allocating the new station, we reply with a
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* DEAUTH frame to tell the other end that we had a problem
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*/
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if (!sta) {
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ieee80211_send_deauth_disassoc(sdata, sdata->u.ibss.bssid,
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IEEE80211_STYPE_DEAUTH,
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WLAN_REASON_UNSPECIFIED, true,
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deauth_frame_buf);
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return;
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}
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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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*/
|
|
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(local, 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(local, band);
|
|
|
|
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, true);
|
|
}
|
|
}
|
|
|
|
if (sta && elems->wmm_info)
|
|
set_sta_flag(sta, WLAN_STA_WME);
|
|
|
|
if (sta && elems->ht_operation && elems->ht_cap_elem &&
|
|
sdata->u.ibss.channel_type != NL80211_CHAN_NO_HT) {
|
|
/* 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 (cfg80211_get_chandef_type(&chandef) !=
|
|
sdata->u.ibss.channel_type)
|
|
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.channel != 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(local, elems, band, NULL);
|
|
ieee80211_ibss_add_sta(sdata, mgmt->bssid, mgmt->sa,
|
|
supp_rates, true);
|
|
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;
|
|
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 */
|
|
sta->sta.supp_rates[band] = supp_rates |
|
|
ieee80211_mandatory_rates(local, band);
|
|
|
|
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;
|
|
|
|
lockdep_assert_held(&sdata->u.ibss.mtx);
|
|
|
|
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;
|
|
|
|
lockdep_assert_held(&ifibss->mtx);
|
|
|
|
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;
|
|
|
|
lockdep_assert_held(&ifibss->mtx);
|
|
|
|
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->channel, 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;
|
|
|
|
lockdep_assert_held(&ifibss->mtx);
|
|
|
|
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->channel;
|
|
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;
|
|
|
|
lockdep_assert_held(&ifibss->mtx);
|
|
|
|
presp = rcu_dereference_protected(ifibss->presp,
|
|
lockdep_is_held(&ifibss->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);
|
|
|
|
mutex_lock(&sdata->u.ibss.mtx);
|
|
|
|
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:
|
|
mutex_unlock(&sdata->u.ibss.mtx);
|
|
}
|
|
|
|
void ieee80211_ibss_work(struct ieee80211_sub_if_data *sdata)
|
|
{
|
|
struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
|
|
struct sta_info *sta;
|
|
|
|
mutex_lock(&ifibss->mtx);
|
|
|
|
/*
|
|
* 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, true);
|
|
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:
|
|
mutex_unlock(&ifibss->mtx);
|
|
}
|
|
|
|
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);
|
|
mutex_init(&ifibss->mtx);
|
|
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;
|
|
|
|
mutex_lock(&sdata->u.ibss.mtx);
|
|
|
|
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;
|
|
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.channel = params->chandef.chan;
|
|
sdata->u.ibss.channel_type =
|
|
cfg80211_get_chandef_type(¶ms->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;
|
|
|
|
mutex_unlock(&sdata->u.ibss.mtx);
|
|
|
|
/*
|
|
* 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;
|
|
|
|
mutex_lock(&sdata->u.ibss.mtx);
|
|
|
|
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->channel,
|
|
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->u.ibss.mtx));
|
|
RCU_INIT_POINTER(sdata->u.ibss.presp, NULL);
|
|
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);
|
|
|
|
mutex_unlock(&sdata->u.ibss.mtx);
|
|
|
|
return 0;
|
|
}
|