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-rw-r--r--net/mac80211/spectmgmt.c249
1 files changed, 249 insertions, 0 deletions
diff --git a/net/mac80211/spectmgmt.c b/net/mac80211/spectmgmt.c
new file mode 100644
index 000000000..76747bfda
--- /dev/null
+++ b/net/mac80211/spectmgmt.c
@@ -0,0 +1,249 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * spectrum management
+ *
+ * Copyright 2003, Jouni Malinen <jkmaline@cc.hut.fi>
+ * Copyright 2002-2005, Instant802 Networks, Inc.
+ * Copyright 2005-2006, Devicescape Software, Inc.
+ * Copyright 2006-2007 Jiri Benc <jbenc@suse.cz>
+ * Copyright 2007, Michael Wu <flamingice@sourmilk.net>
+ * Copyright 2007-2008, Intel Corporation
+ * Copyright 2008, Johannes Berg <johannes@sipsolutions.net>
+ * Copyright (C) 2018, 2020 Intel Corporation
+ */
+
+#include <linux/ieee80211.h>
+#include <net/cfg80211.h>
+#include <net/mac80211.h>
+#include "ieee80211_i.h"
+#include "sta_info.h"
+#include "wme.h"
+
+int ieee80211_parse_ch_switch_ie(struct ieee80211_sub_if_data *sdata,
+ struct ieee802_11_elems *elems,
+ enum nl80211_band current_band,
+ u32 vht_cap_info,
+ u32 sta_flags, u8 *bssid,
+ struct ieee80211_csa_ie *csa_ie)
+{
+ enum nl80211_band new_band = current_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;
+ int secondary_channel_offset = -1;
+
+ memset(csa_ie, 0, sizeof(*csa_ie));
+
+ sec_chan_offs = elems->sec_chan_offs;
+ wide_bw_chansw_ie = elems->wide_bw_chansw_ie;
+
+ if (sta_flags & (IEEE80211_STA_DISABLE_HT |
+ IEEE80211_STA_DISABLE_40MHZ)) {
+ sec_chan_offs = NULL;
+ wide_bw_chansw_ie = 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, ignoring\n",
+ elems->ext_chansw_ie->new_operating_class);
+ }
+ new_chan_no = elems->ext_chansw_ie->new_ch_num;
+ csa_ie->count = elems->ext_chansw_ie->count;
+ csa_ie->mode = elems->ext_chansw_ie->mode;
+ } else if (elems->ch_switch_ie) {
+ new_chan_no = elems->ch_switch_ie->new_ch_num;
+ csa_ie->count = elems->ch_switch_ie->count;
+ csa_ie->mode = elems->ch_switch_ie->mode;
+ } else {
+ /* nothing here we understand */
+ return 1;
+ }
+
+ /* Mesh Channel Switch Parameters Element */
+ if (elems->mesh_chansw_params_ie) {
+ csa_ie->ttl = elems->mesh_chansw_params_ie->mesh_ttl;
+ csa_ie->mode = elems->mesh_chansw_params_ie->mesh_flags;
+ csa_ie->pre_value = le16_to_cpu(
+ elems->mesh_chansw_params_ie->mesh_pre_value);
+
+ if (elems->mesh_chansw_params_ie->mesh_flags &
+ WLAN_EID_CHAN_SWITCH_PARAM_REASON)
+ csa_ie->reason_code = le16_to_cpu(
+ elems->mesh_chansw_params_ie->mesh_reason);
+ }
+
+ 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 (sec_chan_offs) {
+ secondary_channel_offset = sec_chan_offs->sec_chan_offs;
+ } else if (!(sta_flags & IEEE80211_STA_DISABLE_HT)) {
+ /* If the secondary channel offset IE is not present,
+ * we can't know what's the post-CSA offset, so the
+ * best we can do is use 20MHz.
+ */
+ 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(&csa_ie->chandef, new_chan,
+ NL80211_CHAN_HT20);
+ break;
+ case IEEE80211_HT_PARAM_CHA_SEC_ABOVE:
+ cfg80211_chandef_create(&csa_ie->chandef, new_chan,
+ NL80211_CHAN_HT40PLUS);
+ break;
+ case IEEE80211_HT_PARAM_CHA_SEC_BELOW:
+ cfg80211_chandef_create(&csa_ie->chandef, new_chan,
+ NL80211_CHAN_HT40MINUS);
+ break;
+ case -1:
+ cfg80211_chandef_create(&csa_ie->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:
+ csa_ie->chandef.width =
+ sdata->vif.bss_conf.chandef.width;
+ break;
+ default:
+ break;
+ }
+ break;
+ }
+
+ if (wide_bw_chansw_ie) {
+ u8 new_seg1 = wide_bw_chansw_ie->new_center_freq_seg1;
+ struct ieee80211_vht_operation vht_oper = {
+ .chan_width =
+ wide_bw_chansw_ie->new_channel_width,
+ .center_freq_seg0_idx =
+ wide_bw_chansw_ie->new_center_freq_seg0,
+ .center_freq_seg1_idx = new_seg1,
+ /* .basic_mcs_set doesn't matter */
+ };
+ struct ieee80211_ht_operation ht_oper = {
+ .operation_mode =
+ cpu_to_le16(new_seg1 <<
+ IEEE80211_HT_OP_MODE_CCFS2_SHIFT),
+ };
+
+ /* default, for the case of IEEE80211_VHT_CHANWIDTH_USE_HT,
+ * to the previously parsed chandef
+ */
+ new_vht_chandef = csa_ie->chandef;
+
+ /* ignore if parsing fails */
+ if (!ieee80211_chandef_vht_oper(&sdata->local->hw,
+ vht_cap_info,
+ &vht_oper, &ht_oper,
+ &new_vht_chandef))
+ new_vht_chandef.chan = NULL;
+
+ if (sta_flags & IEEE80211_STA_DISABLE_80P80MHZ &&
+ new_vht_chandef.width == NL80211_CHAN_WIDTH_80P80)
+ ieee80211_chandef_downgrade(&new_vht_chandef);
+ if (sta_flags & IEEE80211_STA_DISABLE_160MHZ &&
+ new_vht_chandef.width == NL80211_CHAN_WIDTH_160)
+ ieee80211_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,
+ &csa_ie->chandef)) {
+ sdata_info(sdata,
+ "BSS %pM: CSA has inconsistent channel data, disconnecting\n",
+ bssid);
+ return -EINVAL;
+ }
+ csa_ie->chandef = new_vht_chandef;
+ }
+
+ if (elems->max_channel_switch_time)
+ csa_ie->max_switch_time =
+ (elems->max_channel_switch_time[0] << 0) |
+ (elems->max_channel_switch_time[1] << 8) |
+ (elems->max_channel_switch_time[2] << 16);
+
+ 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,
+ u8 dialog_token)
+{
+ struct ieee80211_local *local = sdata->local;
+ struct sk_buff *skb;
+ struct ieee80211_mgmt *msr_report;
+
+ skb = dev_alloc_skb(sizeof(*msr_report) + local->hw.extra_tx_headroom +
+ sizeof(struct ieee80211_msrment_ie));
+ if (!skb)
+ return;
+
+ skb_reserve(skb, local->hw.extra_tx_headroom);
+ msr_report = skb_put_zero(skb, 24);
+ memcpy(msr_report->da, da, ETH_ALEN);
+ memcpy(msr_report->sa, sdata->vif.addr, ETH_ALEN);
+ memcpy(msr_report->bssid, bssid, ETH_ALEN);
+ msr_report->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
+ IEEE80211_STYPE_ACTION);
+
+ skb_put(skb, 1 + sizeof(msr_report->u.action.u.measurement));
+ msr_report->u.action.category = WLAN_CATEGORY_SPECTRUM_MGMT;
+ msr_report->u.action.u.measurement.action_code =
+ WLAN_ACTION_SPCT_MSR_RPRT;
+ msr_report->u.action.u.measurement.dialog_token = dialog_token;
+
+ msr_report->u.action.u.measurement.element_id = WLAN_EID_MEASURE_REPORT;
+ msr_report->u.action.u.measurement.length =
+ sizeof(struct ieee80211_msrment_ie);
+
+ memset(&msr_report->u.action.u.measurement.msr_elem, 0,
+ sizeof(struct ieee80211_msrment_ie));
+ msr_report->u.action.u.measurement.msr_elem.token = request_ie->token;
+ msr_report->u.action.u.measurement.msr_elem.mode |=
+ IEEE80211_SPCT_MSR_RPRT_MODE_REFUSED;
+ msr_report->u.action.u.measurement.msr_elem.type = request_ie->type;
+
+ ieee80211_tx_skb(sdata, skb);
+}
+
+void ieee80211_process_measurement_req(struct ieee80211_sub_if_data *sdata,
+ struct ieee80211_mgmt *mgmt,
+ size_t len)
+{
+ /*
+ * Ignoring measurement request is spec violation.
+ * Mandatory measurements must be reported optional
+ * measurements might be refused or reported incapable
+ * For now just refuse
+ * TODO: Answer basic measurement as unmeasured
+ */
+ ieee80211_send_refuse_measurement_request(sdata,
+ &mgmt->u.action.u.measurement.msr_elem,
+ mgmt->sa, mgmt->bssid,
+ mgmt->u.action.u.measurement.dialog_token);
+}
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-22 20:37:39 +0000