Return-path: Received: from nick.hrz.tu-chemnitz.de ([134.109.228.11]:37740 "EHLO nick.hrz.tu-chemnitz.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753612Ab3H1Lln (ORCPT ); Wed, 28 Aug 2013 07:41:43 -0400 From: Simon Wunderlich To: linux-wireless@vger.kernel.org Cc: Johannes Berg , Mathias Kretschmer , Simon Wunderlich Subject: [PATCHv4 2/6] mac80211: split off channel switch parsing function Date: Wed, 28 Aug 2013 13:41:29 +0200 Message-Id: <1377690093-27024-3-git-send-email-siwu@hrz.tu-chemnitz.de> (sfid-20130828_134151_589290_CA96A320) In-Reply-To: <1377690093-27024-1-git-send-email-siwu@hrz.tu-chemnitz.de> References: <1377690093-27024-1-git-send-email-siwu@hrz.tu-chemnitz.de> Sender: linux-wireless-owner@vger.kernel.org List-ID: The channel switch parsing function can be re-used for the IBSS code, put the common part into an extra function. Signed-off-by: Simon Wunderlich Signed-off-by: Mathias Kretschmer --- Changes to PATCHv2: * move ieee80211_parse_ch_switch_ie() to mlme.c * document used sta_flags Changes to PATCHv1: * keep reporting the BSSID, this is still important debug output * remove a function declaration which are added in a later patch --- net/mac80211/ieee80211_i.h | 24 +++++++ net/mac80211/mlme.c | 171 ++++---------------------------------------- net/mac80211/spectmgmt.c | 162 +++++++++++++++++++++++++++++++++++++++++ 3 files changed, 198 insertions(+), 159 deletions(-) diff --git a/net/mac80211/ieee80211_i.h b/net/mac80211/ieee80211_i.h index b618651..63b7c9c 100644 --- a/net/mac80211/ieee80211_i.h +++ b/net/mac80211/ieee80211_i.h @@ -1318,6 +1318,7 @@ void ieee80211_mgd_stop(struct ieee80211_sub_if_data *sdata); void ieee80211_mgd_conn_tx_status(struct ieee80211_sub_if_data *sdata, __le16 fc, bool acked); void ieee80211_sta_restart(struct ieee80211_sub_if_data *sdata); +u32 chandef_downgrade(struct cfg80211_chan_def *c); /* IBSS code */ void ieee80211_ibss_notify_scan_completed(struct ieee80211_local *local); @@ -1481,6 +1482,29 @@ void ieee80211_apply_vhtcap_overrides(struct ieee80211_sub_if_data *sdata, void ieee80211_process_measurement_req(struct ieee80211_sub_if_data *sdata, struct ieee80211_mgmt *mgmt, size_t len); +/** + * ieee80211_parse_ch_switch_ie - parses channel switch IEs + * @sdata: the sdata of the interface which has received the frame + * @elems: parsed 802.11 elements received with the frame + * @beacon: indicates if the frame was a beacon or probe response + * @current_band: indicates the current band + * @sta_flags: contains information about own capabilities and restrictions + * to decide which channel switch announcements can be accepted. Only the + * following subset of &enum ieee80211_sta_flags are evaluated: + * %IEEE80211_STA_DISABLE_HT, %IEEE80211_STA_DISABLE_VHT, + * %IEEE80211_STA_DISABLE_40MHZ, %IEEE80211_STA_DISABLE_80P80MHZ, + * %IEEE80211_STA_DISABLE_160MHZ. + * @count: to be filled with the counter until the switch (on success only) + * @bssid: the currently connected bssid (for reporting) + * @mode: to be filled with CSA mode (on success only) + * @new_chandef: to be filled with destination chandef (on success only) + * Return: 0 on success, <0 on error and >0 if there is nothing to parse. + */ +int ieee80211_parse_ch_switch_ie(struct ieee80211_sub_if_data *sdata, + struct ieee802_11_elems *elems, bool beacon, + enum ieee80211_band current_band, + u32 sta_flags, u8 *bssid, u8 *count, u8 *mode, + struct cfg80211_chan_def *new_chandef); /* Suspend/resume and hw reconfiguration */ int ieee80211_reconfig(struct ieee80211_local *local); diff --git a/net/mac80211/mlme.c b/net/mac80211/mlme.c index 2aab130..aa26db4 100644 --- a/net/mac80211/mlme.c +++ b/net/mac80211/mlme.c @@ -145,7 +145,7 @@ static int ecw2cw(int ecw) return (1 << ecw) - 1; } -static u32 chandef_downgrade(struct cfg80211_chan_def *c) +u32 chandef_downgrade(struct cfg80211_chan_def *c) { u32 ret; int tmp; @@ -1000,20 +1000,12 @@ ieee80211_sta_process_chanswitch(struct ieee80211_sub_if_data *sdata, struct ieee80211_local *local = sdata->local; struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; struct cfg80211_bss *cbss = ifmgd->associated; - struct ieee80211_bss *bss; struct ieee80211_chanctx *chanctx; - enum ieee80211_band new_band; - int new_freq; - u8 new_chan_no; + enum ieee80211_band current_band; u8 count; u8 mode; - struct ieee80211_channel *new_chan; struct cfg80211_chan_def new_chandef = {}; - struct cfg80211_chan_def new_vht_chandef = {}; - const struct ieee80211_sec_chan_offs_ie *sec_chan_offs; - const struct ieee80211_wide_bw_chansw_ie *wide_bw_chansw_ie; - const struct ieee80211_ht_operation *ht_oper; - int secondary_channel_offset = -1; + int res; sdata_assert_lock(sdata); @@ -1027,162 +1019,23 @@ ieee80211_sta_process_chanswitch(struct ieee80211_sub_if_data *sdata, if (ifmgd->flags & IEEE80211_STA_CSA_RECEIVED) return; - sec_chan_offs = elems->sec_chan_offs; - wide_bw_chansw_ie = elems->wide_bw_chansw_ie; - ht_oper = elems->ht_operation; - - if (ifmgd->flags & (IEEE80211_STA_DISABLE_HT | - IEEE80211_STA_DISABLE_40MHZ)) { - sec_chan_offs = NULL; - wide_bw_chansw_ie = NULL; - /* only used for bandwidth here */ - ht_oper = NULL; - } - - if (ifmgd->flags & IEEE80211_STA_DISABLE_VHT) - wide_bw_chansw_ie = NULL; - - if (elems->ext_chansw_ie) { - if (!ieee80211_operating_class_to_band( - elems->ext_chansw_ie->new_operating_class, - &new_band)) { - sdata_info(sdata, - "cannot understand ECSA IE operating class %d, disconnecting\n", - elems->ext_chansw_ie->new_operating_class); - ieee80211_queue_work(&local->hw, - &ifmgd->csa_connection_drop_work); - } - new_chan_no = elems->ext_chansw_ie->new_ch_num; - count = elems->ext_chansw_ie->count; - mode = elems->ext_chansw_ie->mode; - } else if (elems->ch_switch_ie) { - new_band = cbss->channel->band; - new_chan_no = elems->ch_switch_ie->new_ch_num; - count = elems->ch_switch_ie->count; - mode = elems->ch_switch_ie->mode; - } else { - /* nothing here we understand */ - return; - } - - bss = (void *)cbss->priv; - - new_freq = ieee80211_channel_to_frequency(new_chan_no, new_band); - new_chan = ieee80211_get_channel(sdata->local->hw.wiphy, new_freq); - if (!new_chan || new_chan->flags & IEEE80211_CHAN_DISABLED) { - sdata_info(sdata, - "AP %pM switches to unsupported channel (%d MHz), disconnecting\n", - ifmgd->associated->bssid, new_freq); + current_band = cbss->channel->band; + res = ieee80211_parse_ch_switch_ie(sdata, elems, beacon, current_band, + ifmgd->flags, + ifmgd->associated->bssid, &count, + &mode, &new_chandef); + if (res < 0) ieee80211_queue_work(&local->hw, &ifmgd->csa_connection_drop_work); + if (res) return; - } - - if (!beacon && sec_chan_offs) { - secondary_channel_offset = sec_chan_offs->sec_chan_offs; - } else if (beacon && ht_oper) { - secondary_channel_offset = - ht_oper->ht_param & IEEE80211_HT_PARAM_CHA_SEC_OFFSET; - } else if (!(ifmgd->flags & IEEE80211_STA_DISABLE_HT)) { - /* - * If it's not a beacon, HT is enabled and the IE not present, - * it's 20 MHz, 802.11-2012 8.5.2.6: - * This element [the Secondary Channel Offset Element] is - * present when switching to a 40 MHz channel. It may be - * present when switching to a 20 MHz channel (in which - * case the secondary channel offset is set to SCN). - */ - secondary_channel_offset = IEEE80211_HT_PARAM_CHA_SEC_NONE; - } - - switch (secondary_channel_offset) { - default: - /* secondary_channel_offset was present but is invalid */ - case IEEE80211_HT_PARAM_CHA_SEC_NONE: - cfg80211_chandef_create(&new_chandef, new_chan, - NL80211_CHAN_HT20); - break; - case IEEE80211_HT_PARAM_CHA_SEC_ABOVE: - cfg80211_chandef_create(&new_chandef, new_chan, - NL80211_CHAN_HT40PLUS); - break; - case IEEE80211_HT_PARAM_CHA_SEC_BELOW: - cfg80211_chandef_create(&new_chandef, new_chan, - NL80211_CHAN_HT40MINUS); - break; - case -1: - cfg80211_chandef_create(&new_chandef, new_chan, - NL80211_CHAN_NO_HT); - /* keep width for 5/10 MHz channels */ - switch (sdata->vif.bss_conf.chandef.width) { - case NL80211_CHAN_WIDTH_5: - case NL80211_CHAN_WIDTH_10: - new_chandef.width = sdata->vif.bss_conf.chandef.width; - break; - default: - break; - } - break; - } - - if (wide_bw_chansw_ie) { - new_vht_chandef.chan = new_chan; - new_vht_chandef.center_freq1 = - ieee80211_channel_to_frequency( - wide_bw_chansw_ie->new_center_freq_seg0, - new_band); - - switch (wide_bw_chansw_ie->new_channel_width) { - default: - /* hmmm, ignore VHT and use HT if present */ - case IEEE80211_VHT_CHANWIDTH_USE_HT: - new_vht_chandef.chan = NULL; - break; - case IEEE80211_VHT_CHANWIDTH_80MHZ: - new_vht_chandef.width = NL80211_CHAN_WIDTH_80; - break; - case IEEE80211_VHT_CHANWIDTH_160MHZ: - new_vht_chandef.width = NL80211_CHAN_WIDTH_160; - break; - case IEEE80211_VHT_CHANWIDTH_80P80MHZ: - /* field is otherwise reserved */ - new_vht_chandef.center_freq2 = - ieee80211_channel_to_frequency( - wide_bw_chansw_ie->new_center_freq_seg1, - new_band); - new_vht_chandef.width = NL80211_CHAN_WIDTH_80P80; - break; - } - if (ifmgd->flags & IEEE80211_STA_DISABLE_80P80MHZ && - new_vht_chandef.width == NL80211_CHAN_WIDTH_80P80) - chandef_downgrade(&new_vht_chandef); - if (ifmgd->flags & IEEE80211_STA_DISABLE_160MHZ && - new_vht_chandef.width == NL80211_CHAN_WIDTH_160) - chandef_downgrade(&new_vht_chandef); - if (ifmgd->flags & IEEE80211_STA_DISABLE_40MHZ && - new_vht_chandef.width > NL80211_CHAN_WIDTH_20) - chandef_downgrade(&new_vht_chandef); - } - - /* if VHT data is there validate & use it */ - if (new_vht_chandef.chan) { - if (!cfg80211_chandef_compatible(&new_vht_chandef, - &new_chandef)) { - sdata_info(sdata, - "AP %pM CSA has inconsistent channel data, disconnecting\n", - ifmgd->associated->bssid); - ieee80211_queue_work(&local->hw, - &ifmgd->csa_connection_drop_work); - return; - } - new_chandef = new_vht_chandef; - } if (!cfg80211_chandef_usable(local->hw.wiphy, &new_chandef, IEEE80211_CHAN_DISABLED)) { sdata_info(sdata, "AP %pM switches to unsupported channel (%d MHz, width:%d, CF1/2: %d/%d MHz), disconnecting\n", - ifmgd->associated->bssid, new_freq, + ifmgd->associated->bssid, + new_chandef.chan->center_freq, new_chandef.width, new_chandef.center_freq1, new_chandef.center_freq2); ieee80211_queue_work(&local->hw, diff --git a/net/mac80211/spectmgmt.c b/net/mac80211/spectmgmt.c index 578eea3..4f2c873 100644 --- a/net/mac80211/spectmgmt.c +++ b/net/mac80211/spectmgmt.c @@ -21,6 +21,168 @@ #include "sta_info.h" #include "wme.h" +int ieee80211_parse_ch_switch_ie(struct ieee80211_sub_if_data *sdata, + struct ieee802_11_elems *elems, bool beacon, + enum ieee80211_band current_band, + u32 sta_flags, u8 *bssid, u8 *count, u8 *mode, + struct cfg80211_chan_def *new_chandef) +{ + enum ieee80211_band new_band; + int new_freq; + u8 new_chan_no; + struct ieee80211_channel *new_chan; + struct cfg80211_chan_def new_vht_chandef = {}; + const struct ieee80211_sec_chan_offs_ie *sec_chan_offs; + const struct ieee80211_wide_bw_chansw_ie *wide_bw_chansw_ie; + const struct ieee80211_ht_operation *ht_oper; + int secondary_channel_offset = -1; + + sec_chan_offs = elems->sec_chan_offs; + wide_bw_chansw_ie = elems->wide_bw_chansw_ie; + ht_oper = elems->ht_operation; + + if (sta_flags & (IEEE80211_STA_DISABLE_HT | + IEEE80211_STA_DISABLE_40MHZ)) { + sec_chan_offs = NULL; + wide_bw_chansw_ie = NULL; + /* only used for bandwidth here */ + ht_oper = NULL; + } + + if (sta_flags & IEEE80211_STA_DISABLE_VHT) + wide_bw_chansw_ie = NULL; + + if (elems->ext_chansw_ie) { + if (!ieee80211_operating_class_to_band( + elems->ext_chansw_ie->new_operating_class, + &new_band)) { + sdata_info(sdata, + "cannot understand ECSA IE operating class %d, disconnecting\n", + elems->ext_chansw_ie->new_operating_class); + return -EINVAL; + } + new_chan_no = elems->ext_chansw_ie->new_ch_num; + *count = elems->ext_chansw_ie->count; + *mode = elems->ext_chansw_ie->mode; + } else if (elems->ch_switch_ie) { + new_band = current_band; + new_chan_no = elems->ch_switch_ie->new_ch_num; + *count = elems->ch_switch_ie->count; + *mode = elems->ch_switch_ie->mode; + } else { + /* nothing here we understand */ + return 1; + } + + new_freq = ieee80211_channel_to_frequency(new_chan_no, new_band); + new_chan = ieee80211_get_channel(sdata->local->hw.wiphy, new_freq); + if (!new_chan || new_chan->flags & IEEE80211_CHAN_DISABLED) { + sdata_info(sdata, + "BSS %pM switches to unsupported channel (%d MHz), disconnecting\n", + bssid, new_freq); + return -EINVAL; + } + + if (!beacon && sec_chan_offs) { + secondary_channel_offset = sec_chan_offs->sec_chan_offs; + } else if (beacon && ht_oper) { + secondary_channel_offset = + ht_oper->ht_param & IEEE80211_HT_PARAM_CHA_SEC_OFFSET; + } else if (!(sta_flags & IEEE80211_STA_DISABLE_HT)) { + /* If it's not a beacon, HT is enabled and the IE not present, + * it's 20 MHz, 802.11-2012 8.5.2.6: + * This element [the Secondary Channel Offset Element] is + * present when switching to a 40 MHz channel. It may be + * present when switching to a 20 MHz channel (in which + * case the secondary channel offset is set to SCN). + */ + secondary_channel_offset = IEEE80211_HT_PARAM_CHA_SEC_NONE; + } + + switch (secondary_channel_offset) { + default: + /* secondary_channel_offset was present but is invalid */ + case IEEE80211_HT_PARAM_CHA_SEC_NONE: + cfg80211_chandef_create(new_chandef, new_chan, + NL80211_CHAN_HT20); + break; + case IEEE80211_HT_PARAM_CHA_SEC_ABOVE: + cfg80211_chandef_create(new_chandef, new_chan, + NL80211_CHAN_HT40PLUS); + break; + case IEEE80211_HT_PARAM_CHA_SEC_BELOW: + cfg80211_chandef_create(new_chandef, new_chan, + NL80211_CHAN_HT40MINUS); + break; + case -1: + cfg80211_chandef_create(new_chandef, new_chan, + NL80211_CHAN_NO_HT); + /* keep width for 5/10 MHz channels */ + switch (sdata->vif.bss_conf.chandef.width) { + case NL80211_CHAN_WIDTH_5: + case NL80211_CHAN_WIDTH_10: + new_chandef->width = sdata->vif.bss_conf.chandef.width; + break; + default: + break; + } + break; + } + + if (wide_bw_chansw_ie) { + new_vht_chandef.chan = new_chan; + new_vht_chandef.center_freq1 = + ieee80211_channel_to_frequency( + wide_bw_chansw_ie->new_center_freq_seg0, + new_band); + + switch (wide_bw_chansw_ie->new_channel_width) { + default: + /* hmmm, ignore VHT and use HT if present */ + case IEEE80211_VHT_CHANWIDTH_USE_HT: + new_vht_chandef.chan = NULL; + break; + case IEEE80211_VHT_CHANWIDTH_80MHZ: + new_vht_chandef.width = NL80211_CHAN_WIDTH_80; + break; + case IEEE80211_VHT_CHANWIDTH_160MHZ: + new_vht_chandef.width = NL80211_CHAN_WIDTH_160; + break; + case IEEE80211_VHT_CHANWIDTH_80P80MHZ: + /* field is otherwise reserved */ + new_vht_chandef.center_freq2 = + ieee80211_channel_to_frequency( + wide_bw_chansw_ie->new_center_freq_seg1, + new_band); + new_vht_chandef.width = NL80211_CHAN_WIDTH_80P80; + break; + } + if (sta_flags & IEEE80211_STA_DISABLE_80P80MHZ && + new_vht_chandef.width == NL80211_CHAN_WIDTH_80P80) + chandef_downgrade(&new_vht_chandef); + if (sta_flags & IEEE80211_STA_DISABLE_160MHZ && + new_vht_chandef.width == NL80211_CHAN_WIDTH_160) + chandef_downgrade(&new_vht_chandef); + if (sta_flags & IEEE80211_STA_DISABLE_40MHZ && + new_vht_chandef.width > NL80211_CHAN_WIDTH_20) + chandef_downgrade(&new_vht_chandef); + } + + /* if VHT data is there validate & use it */ + if (new_vht_chandef.chan) { + if (!cfg80211_chandef_compatible(&new_vht_chandef, + new_chandef)) { + sdata_info(sdata, + "BSS %pM: CSA has inconsistent channel data, disconnecting\n", + bssid); + return -EINVAL; + } + *new_chandef = new_vht_chandef; + } + + return 0; +} + static void ieee80211_send_refuse_measurement_request(struct ieee80211_sub_if_data *sdata, struct ieee80211_msrment_ie *request_ie, const u8 *da, const u8 *bssid, -- 1.7.10.4