Return-path: Received: from mail.atheros.com ([12.36.123.2]:11469 "EHLO mail.atheros.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752702AbZAFEBw (ORCPT ); Mon, 5 Jan 2009 23:01:52 -0500 Received: from mail.atheros.com ([10.10.20.108]) by sidewinder.atheros.com for ; Mon, 05 Jan 2009 20:01:52 -0800 From: Sujith MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Message-ID: <18786.55021.734826.472061@gargle.gargle.HOWL> (sfid-20090106_050157_991854_97BB764D) Date: Tue, 6 Jan 2009 09:28:37 +0530 To: CC: , , Subject: [PATCH] mac80211: Add 802.11h CSA support Sender: linux-wireless-owner@vger.kernel.org List-ID: Move to the advertised channel on reception of a CSA element. This is needed for 802.11h compliance. Signed-off-by: Sujith --- v2 -- * Add a new variable to hold the CSA channel * Use msecs_to_jiffies for calculating expiration time * Add a check to drop beacons in case of a frequency mismatch v3 -- * Add a BSSID check when handling CSA action frame net/mac80211/ieee80211_i.h | 11 ++++++- net/mac80211/iface.c | 2 + net/mac80211/mlme.c | 13 +++++++ net/mac80211/rx.c | 20 +++++++++++ net/mac80211/spectmgmt.c | 77 ++++++++++++++++++++++++++++++++++++++++++++ 5 files changed, 122 insertions(+), 1 deletions(-) diff --git a/net/mac80211/ieee80211_i.h b/net/mac80211/ieee80211_i.h index 117718b..d2a007a 100644 --- a/net/mac80211/ieee80211_i.h +++ b/net/mac80211/ieee80211_i.h @@ -259,6 +259,7 @@ struct mesh_preq_queue { #define IEEE80211_STA_AUTO_CHANNEL_SEL BIT(12) #define IEEE80211_STA_PRIVACY_INVOKED BIT(13) #define IEEE80211_STA_TKIP_WEP_USED BIT(14) +#define IEEE80211_STA_CSA_RECEIVED BIT(15) /* flags for MLME request */ #define IEEE80211_STA_REQ_SCAN 0 #define IEEE80211_STA_REQ_DIRECT_PROBE 1 @@ -283,7 +284,9 @@ enum ieee80211_sta_mlme_state { struct ieee80211_if_sta { struct timer_list timer; + struct timer_list chswitch_timer; struct work_struct work; + struct work_struct chswitch_work; u8 bssid[ETH_ALEN], prev_bssid[ETH_ALEN]; u8 ssid[IEEE80211_MAX_SSID_LEN]; enum ieee80211_sta_mlme_state state; @@ -542,6 +545,7 @@ enum { enum queue_stop_reason { IEEE80211_QUEUE_STOP_REASON_DRIVER, IEEE80211_QUEUE_STOP_REASON_PS, + IEEE80211_QUEUE_STOP_REASON_CSA }; /* maximum number of hardware queues we support. */ @@ -631,7 +635,7 @@ struct ieee80211_local { unsigned long last_scan_completed; struct delayed_work scan_work; struct ieee80211_sub_if_data *scan_sdata; - struct ieee80211_channel *oper_channel, *scan_channel; + struct ieee80211_channel *oper_channel, *scan_channel, *csa_channel; enum nl80211_channel_type oper_channel_type; u8 scan_ssid[IEEE80211_MAX_SSID_LEN]; size_t scan_ssid_len; @@ -964,6 +968,11 @@ void ieee80211_process_addba_request(struct ieee80211_local *local, void ieee80211_process_measurement_req(struct ieee80211_sub_if_data *sdata, struct ieee80211_mgmt *mgmt, size_t len); +void ieee80211_chswitch_timer(unsigned long data); +void ieee80211_chswitch_work(struct work_struct *work); +void ieee80211_process_chanswitch(struct ieee80211_sub_if_data *sdata, + struct ieee80211_channel_sw_ie *sw_elem, + struct ieee80211_bss *bss); /* utility functions/constants */ extern void *mac80211_wiphy_privid; /* for wiphy privid */ diff --git a/net/mac80211/iface.c b/net/mac80211/iface.c index 2c7a87d..f927641 100644 --- a/net/mac80211/iface.c +++ b/net/mac80211/iface.c @@ -443,6 +443,7 @@ static int ieee80211_stop(struct net_device *dev) WLAN_REASON_DEAUTH_LEAVING); memset(sdata->u.sta.bssid, 0, ETH_ALEN); + del_timer_sync(&sdata->u.sta.chswitch_timer); del_timer_sync(&sdata->u.sta.timer); /* * If the timer fired while we waited for it, it will have @@ -452,6 +453,7 @@ static int ieee80211_stop(struct net_device *dev) * it no longer is. */ cancel_work_sync(&sdata->u.sta.work); + cancel_work_sync(&sdata->u.sta.chswitch_work); /* * When we get here, the interface is marked down. * Call synchronize_rcu() to wait for the RX path diff --git a/net/mac80211/mlme.c b/net/mac80211/mlme.c index e317c6d..4d25cf9 100644 --- a/net/mac80211/mlme.c +++ b/net/mac80211/mlme.c @@ -1645,6 +1645,13 @@ static void ieee80211_rx_bss_info(struct ieee80211_sub_if_data *sdata, if (!bss) return; + if (elems->ch_switch_elem && (elems->ch_switch_elem_len == 3) && + (memcmp(mgmt->bssid, sdata->u.sta.bssid, ETH_ALEN) == 0)) { + struct ieee80211_channel_sw_ie *sw_elem = + (struct ieee80211_channel_sw_ie *)elems->ch_switch_elem; + ieee80211_process_chanswitch(sdata, sw_elem, bss); + } + /* was just updated in ieee80211_bss_info_update */ beacon_timestamp = bss->timestamp; @@ -1781,6 +1788,9 @@ static void ieee80211_rx_mgmt_beacon(struct ieee80211_sub_if_data *sdata, memcmp(ifsta->bssid, mgmt->bssid, ETH_ALEN) != 0) return; + if (rx_status->freq != local->hw.conf.channel->center_freq) + return; + ieee80211_sta_wmm_params(local, ifsta, elems.wmm_param, elems.wmm_param_len); @@ -2447,8 +2457,11 @@ void ieee80211_sta_setup_sdata(struct ieee80211_sub_if_data *sdata) ifsta = &sdata->u.sta; INIT_WORK(&ifsta->work, ieee80211_sta_work); + INIT_WORK(&ifsta->chswitch_work, ieee80211_chswitch_work); setup_timer(&ifsta->timer, ieee80211_sta_timer, (unsigned long) sdata); + setup_timer(&ifsta->chswitch_timer, ieee80211_chswitch_timer, + (unsigned long) sdata); skb_queue_head_init(&ifsta->skb_queue); ifsta->capab = WLAN_CAPABILITY_ESS; diff --git a/net/mac80211/rx.c b/net/mac80211/rx.c index 384cb3b..4b7bc3d 100644 --- a/net/mac80211/rx.c +++ b/net/mac80211/rx.c @@ -1564,7 +1564,9 @@ ieee80211_rx_h_action(struct ieee80211_rx_data *rx) { struct ieee80211_local *local = rx->local; struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(rx->dev); + struct ieee80211_if_sta *ifsta = &sdata->u.sta; struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data; + struct ieee80211_bss *bss; int len = rx->skb->len; if (!ieee80211_is_action(mgmt->frame_control)) @@ -1613,6 +1615,24 @@ ieee80211_rx_h_action(struct ieee80211_rx_data *rx) return RX_DROP_MONITOR; ieee80211_process_measurement_req(sdata, mgmt, len); break; + case WLAN_ACTION_SPCT_CHL_SWITCH: + if (len < (IEEE80211_MIN_ACTION_SIZE + + sizeof(mgmt->u.action.u.chan_switch))) + return RX_DROP_MONITOR; + + if (memcmp(mgmt->bssid, ifsta->bssid, ETH_ALEN) != 0) + return RX_DROP_MONITOR; + + bss = ieee80211_rx_bss_get(local, ifsta->bssid, + local->hw.conf.channel->center_freq, + ifsta->ssid, ifsta->ssid_len); + if (!bss) + return RX_DROP_MONITOR; + + ieee80211_process_chanswitch(sdata, + &mgmt->u.action.u.chan_switch.sw_elem, bss); + ieee80211_rx_bss_put(local, bss); + break; } break; default: diff --git a/net/mac80211/spectmgmt.c b/net/mac80211/spectmgmt.c index f72bad6..22ad480 100644 --- a/net/mac80211/spectmgmt.c +++ b/net/mac80211/spectmgmt.c @@ -84,3 +84,80 @@ void ieee80211_process_measurement_req(struct ieee80211_sub_if_data *sdata, mgmt->sa, mgmt->bssid, mgmt->u.action.u.measurement.dialog_token); } + +void ieee80211_chswitch_work(struct work_struct *work) +{ + struct ieee80211_sub_if_data *sdata = + container_of(work, struct ieee80211_sub_if_data, u.sta.chswitch_work); + struct ieee80211_bss *bss; + struct ieee80211_if_sta *ifsta = &sdata->u.sta; + + if (!netif_running(sdata->dev)) + return; + + bss = ieee80211_rx_bss_get(sdata->local, ifsta->bssid, + sdata->local->hw.conf.channel->center_freq, + ifsta->ssid, ifsta->ssid_len); + if (!bss) + goto exit; + + sdata->local->oper_channel = sdata->local->csa_channel; + if (!ieee80211_hw_config(sdata->local, IEEE80211_CONF_CHANGE_CHANNEL)) + bss->freq = sdata->local->oper_channel->center_freq; + + ieee80211_rx_bss_put(sdata->local, bss); +exit: + ifsta->flags &= ~IEEE80211_STA_CSA_RECEIVED; + ieee80211_wake_queues_by_reason(&sdata->local->hw, + IEEE80211_QUEUE_STOP_REASON_CSA); +} + +void ieee80211_chswitch_timer(unsigned long data) +{ + struct ieee80211_sub_if_data *sdata = + (struct ieee80211_sub_if_data *) data; + struct ieee80211_if_sta *ifsta = &sdata->u.sta; + + queue_work(sdata->local->hw.workqueue, &ifsta->chswitch_work); +} + +void ieee80211_process_chanswitch(struct ieee80211_sub_if_data *sdata, + struct ieee80211_channel_sw_ie *sw_elem, + struct ieee80211_bss *bss) +{ + struct ieee80211_channel *new_ch; + struct ieee80211_if_sta *ifsta = &sdata->u.sta; + int new_freq = ieee80211_channel_to_frequency(sw_elem->new_ch_num); + + /* FIXME: Handle ADHOC later */ + if (sdata->vif.type != NL80211_IFTYPE_STATION) + return; + + if (ifsta->state != IEEE80211_STA_MLME_ASSOCIATED) + return; + + if (sdata->local->sw_scanning || sdata->local->hw_scanning) + return; + + /* Disregard subsequent beacons if we are already running a timer + processing a CSA */ + + if (ifsta->flags & IEEE80211_STA_CSA_RECEIVED) + return; + + new_ch = ieee80211_get_channel(sdata->local->hw.wiphy, new_freq); + if (!new_ch || new_ch->flags & IEEE80211_CHAN_DISABLED) + return; + + sdata->local->csa_channel = new_ch; + + if (sw_elem->count <= 1) { + queue_work(sdata->local->hw.workqueue, &ifsta->chswitch_work); + } else { + ieee80211_stop_queues_by_reason(&sdata->local->hw, + IEEE80211_QUEUE_STOP_REASON_CSA); + ifsta->flags |= IEEE80211_STA_CSA_RECEIVED; + mod_timer(&ifsta->chswitch_timer, + jiffies + msecs_to_jiffies(sw_elem->count * bss->beacon_int)); + } +} -- 1.6.0.3