525 lines
16 KiB
Diff
525 lines
16 KiB
Diff
From: John Crispin <john@phrozen.org>
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Date: Fri, 2 Jul 2021 19:44:08 +0200
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Subject: [PATCH] mac80211: add support for BSS color change
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The color change announcement is very similar to how CSA works where
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we have an IE that includes a counter. When the counter hits 0, the new
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color is applied via an updated beacon.
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This patch makes the CSA counter functionality reusable, rather than
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implementing it again. This also allows for future reuse incase support
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for other counter IEs gets added.
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Co-developed-by: Lorenzo Bianconi <lorenzo@kernel.org>
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Signed-off-by: Lorenzo Bianconi <lorenzo@kernel.org>
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Signed-off-by: John Crispin <john@phrozen.org>
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Link: https://lore.kernel.org/r/057c1e67b82bee561ea44ce6a45a8462d3da6995.1625247619.git.lorenzo@kernel.org
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Signed-off-by: Johannes Berg <johannes.berg@intel.com>
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---
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--- a/include/net/mac80211.h
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+++ b/include/net/mac80211.h
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@@ -1715,6 +1715,10 @@ enum ieee80211_offload_flags {
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* protected by fq->lock.
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* @offload_flags: 802.3 -> 802.11 enapsulation offload flags, see
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* &enum ieee80211_offload_flags.
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+ * @color_change_active: marks whether a color change is ongoing. Internally it is
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+ * write-protected by sdata_lock and local->mtx so holding either is fine
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+ * for read access.
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+ * @color_change_color: the bss color that will be used after the change.
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*/
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struct ieee80211_vif {
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enum nl80211_iftype type;
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@@ -1743,6 +1747,9 @@ struct ieee80211_vif {
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bool txqs_stopped[IEEE80211_NUM_ACS];
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+ bool color_change_active;
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+ u8 color_change_color;
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+
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/* must be last */
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u8 drv_priv[] __aligned(sizeof(void *));
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};
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@@ -5016,6 +5023,16 @@ void ieee80211_csa_finish(struct ieee802
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bool ieee80211_beacon_cntdwn_is_complete(struct ieee80211_vif *vif);
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/**
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+ * ieee80211_color_change_finish - notify mac80211 about color change
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+ * @vif: &struct ieee80211_vif pointer from the add_interface callback.
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+ *
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+ * After a color change announcement was scheduled and the counter in this
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+ * announcement hits 1, this function must be called by the driver to
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+ * notify mac80211 that the color can be changed
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+ */
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+void ieee80211_color_change_finish(struct ieee80211_vif *vif);
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+
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+/**
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* ieee80211_proberesp_get - retrieve a Probe Response template
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* @hw: pointer obtained from ieee80211_alloc_hw().
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* @vif: &struct ieee80211_vif pointer from the add_interface callback.
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@@ -6780,6 +6797,18 @@ ieee80211_get_unsol_bcast_probe_resp_tmp
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struct ieee80211_vif *vif);
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/**
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+ * ieeee80211_obss_color_collision_notify - notify userland about a BSS color
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+ * collision.
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+ *
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+ * @vif: &struct ieee80211_vif pointer from the add_interface callback.
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+ * @color_bitmap: a 64 bit bitmap representing the colors that the local BSS is
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+ * aware of.
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+ */
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+void
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+ieeee80211_obss_color_collision_notify(struct ieee80211_vif *vif,
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+ u64 color_bitmap);
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+
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+/**
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* ieee80211_is_tx_data - check if frame is a data frame
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*
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* The function is used to check if a frame is a data frame. Frames with
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--- a/net/mac80211/cfg.c
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+++ b/net/mac80211/cfg.c
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@@ -828,9 +828,11 @@ static int ieee80211_set_monitor_channel
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return ret;
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}
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-static int ieee80211_set_probe_resp(struct ieee80211_sub_if_data *sdata,
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- const u8 *resp, size_t resp_len,
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- const struct ieee80211_csa_settings *csa)
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+static int
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+ieee80211_set_probe_resp(struct ieee80211_sub_if_data *sdata,
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+ const u8 *resp, size_t resp_len,
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+ const struct ieee80211_csa_settings *csa,
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+ const struct ieee80211_color_change_settings *cca)
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{
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struct probe_resp *new, *old;
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@@ -850,6 +852,8 @@ static int ieee80211_set_probe_resp(stru
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memcpy(new->cntdwn_counter_offsets, csa->counter_offsets_presp,
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csa->n_counter_offsets_presp *
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sizeof(new->cntdwn_counter_offsets[0]));
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+ else if (cca)
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+ new->cntdwn_counter_offsets[0] = cca->counter_offset_presp;
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rcu_assign_pointer(sdata->u.ap.probe_resp, new);
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if (old)
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@@ -955,7 +959,8 @@ static int ieee80211_set_ftm_responder_p
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static int ieee80211_assign_beacon(struct ieee80211_sub_if_data *sdata,
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struct cfg80211_beacon_data *params,
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- const struct ieee80211_csa_settings *csa)
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+ const struct ieee80211_csa_settings *csa,
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+ const struct ieee80211_color_change_settings *cca)
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{
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struct beacon_data *new, *old;
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int new_head_len, new_tail_len;
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@@ -1004,6 +1009,9 @@ static int ieee80211_assign_beacon(struc
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memcpy(new->cntdwn_counter_offsets, csa->counter_offsets_beacon,
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csa->n_counter_offsets_beacon *
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sizeof(new->cntdwn_counter_offsets[0]));
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+ } else if (cca) {
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+ new->cntdwn_current_counter = cca->count;
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+ new->cntdwn_counter_offsets[0] = cca->counter_offset_beacon;
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}
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/* copy in head */
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@@ -1020,7 +1028,7 @@ static int ieee80211_assign_beacon(struc
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memcpy(new->tail, old->tail, new_tail_len);
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err = ieee80211_set_probe_resp(sdata, params->probe_resp,
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- params->probe_resp_len, csa);
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+ params->probe_resp_len, csa, cca);
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if (err < 0) {
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kfree(new);
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return err;
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@@ -1175,7 +1183,7 @@ static int ieee80211_start_ap(struct wip
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if (ieee80211_hw_check(&local->hw, HAS_RATE_CONTROL))
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sdata->vif.bss_conf.beacon_tx_rate = params->beacon_rate;
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- err = ieee80211_assign_beacon(sdata, ¶ms->beacon, NULL);
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+ err = ieee80211_assign_beacon(sdata, ¶ms->beacon, NULL, NULL);
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if (err < 0)
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goto error;
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changed |= err;
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@@ -1230,17 +1238,17 @@ static int ieee80211_change_beacon(struc
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sdata = IEEE80211_DEV_TO_SUB_IF(dev);
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sdata_assert_lock(sdata);
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- /* don't allow changing the beacon while CSA is in place - offset
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+ /* don't allow changing the beacon while a countdown is in place - offset
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* of channel switch counter may change
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*/
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- if (sdata->vif.csa_active)
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+ if (sdata->vif.csa_active || sdata->vif.color_change_active)
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return -EBUSY;
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old = sdata_dereference(sdata->u.ap.beacon, sdata);
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if (!old)
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return -ENOENT;
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- err = ieee80211_assign_beacon(sdata, params, NULL);
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+ err = ieee80211_assign_beacon(sdata, params, NULL, NULL);
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if (err < 0)
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return err;
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ieee80211_bss_info_change_notify(sdata, err);
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@@ -3155,7 +3163,7 @@ static int ieee80211_set_after_csa_beaco
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switch (sdata->vif.type) {
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case NL80211_IFTYPE_AP:
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err = ieee80211_assign_beacon(sdata, sdata->u.ap.next_beacon,
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- NULL);
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+ NULL, NULL);
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kfree(sdata->u.ap.next_beacon);
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sdata->u.ap.next_beacon = NULL;
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@@ -3321,7 +3329,7 @@ static int ieee80211_set_csa_beacon(stru
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csa.n_counter_offsets_presp = params->n_counter_offsets_presp;
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csa.count = params->count;
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- err = ieee80211_assign_beacon(sdata, ¶ms->beacon_csa, &csa);
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+ err = ieee80211_assign_beacon(sdata, ¶ms->beacon_csa, &csa, NULL);
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if (err < 0) {
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kfree(sdata->u.ap.next_beacon);
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return err;
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@@ -3410,6 +3418,15 @@ static int ieee80211_set_csa_beacon(stru
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return 0;
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}
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+static void ieee80211_color_change_abort(struct ieee80211_sub_if_data *sdata)
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+{
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+ sdata->vif.color_change_active = false;
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+ kfree(sdata->u.ap.next_beacon);
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+ sdata->u.ap.next_beacon = NULL;
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+
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+ cfg80211_color_change_aborted_notify(sdata->dev);
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+}
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+
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static int
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__ieee80211_channel_switch(struct wiphy *wiphy, struct net_device *dev,
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struct cfg80211_csa_settings *params)
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@@ -3478,6 +3495,10 @@ __ieee80211_channel_switch(struct wiphy
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goto out;
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}
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+ /* if there is a color change in progress, abort it */
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+ if (sdata->vif.color_change_active)
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+ ieee80211_color_change_abort(sdata);
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+
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err = ieee80211_set_csa_beacon(sdata, params, &changed);
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if (err) {
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ieee80211_vif_unreserve_chanctx(sdata);
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@@ -4129,6 +4150,196 @@ static int ieee80211_set_sar_specs(struc
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return local->ops->set_sar_specs(&local->hw, sar);
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}
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+static int
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+ieee80211_set_after_color_change_beacon(struct ieee80211_sub_if_data *sdata,
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+ u32 *changed)
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+{
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+ switch (sdata->vif.type) {
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+ case NL80211_IFTYPE_AP: {
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+ int ret;
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+
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+ ret = ieee80211_assign_beacon(sdata, sdata->u.ap.next_beacon,
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+ NULL, NULL);
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+ kfree(sdata->u.ap.next_beacon);
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+ sdata->u.ap.next_beacon = NULL;
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+
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+ if (ret < 0)
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+ return ret;
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+
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+ *changed |= ret;
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+ break;
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+ }
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+ default:
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+ WARN_ON_ONCE(1);
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+ return -EINVAL;
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+ }
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+
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+ return 0;
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+}
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+
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+static int
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+ieee80211_set_color_change_beacon(struct ieee80211_sub_if_data *sdata,
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+ struct cfg80211_color_change_settings *params,
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+ u32 *changed)
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+{
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+ struct ieee80211_color_change_settings color_change = {};
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+ int err;
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+
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+ switch (sdata->vif.type) {
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+ case NL80211_IFTYPE_AP:
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+ sdata->u.ap.next_beacon =
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+ cfg80211_beacon_dup(¶ms->beacon_next);
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+ if (!sdata->u.ap.next_beacon)
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+ return -ENOMEM;
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+
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+ if (params->count <= 1)
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+ break;
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+
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+ color_change.counter_offset_beacon =
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+ params->counter_offset_beacon;
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+ color_change.counter_offset_presp =
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+ params->counter_offset_presp;
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+ color_change.count = params->count;
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+
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+ err = ieee80211_assign_beacon(sdata, ¶ms->beacon_color_change,
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+ NULL, &color_change);
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+ if (err < 0) {
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+ kfree(sdata->u.ap.next_beacon);
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+ return err;
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+ }
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+ *changed |= err;
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+ break;
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+ default:
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+ return -EOPNOTSUPP;
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+ }
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+
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+ return 0;
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+}
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+
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+static void
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+ieee80211_color_change_bss_config_notify(struct ieee80211_sub_if_data *sdata,
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+ u8 color, int enable, u32 changed)
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+{
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+ sdata->vif.bss_conf.he_bss_color.color = color;
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+ sdata->vif.bss_conf.he_bss_color.enabled = enable;
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+ changed |= BSS_CHANGED_HE_BSS_COLOR;
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+
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+ ieee80211_bss_info_change_notify(sdata, changed);
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+}
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+
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+static int ieee80211_color_change_finalize(struct ieee80211_sub_if_data *sdata)
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+{
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+ struct ieee80211_local *local = sdata->local;
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+ u32 changed = 0;
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+ int err;
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+
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+ sdata_assert_lock(sdata);
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+ lockdep_assert_held(&local->mtx);
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+
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+ sdata->vif.color_change_active = false;
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+
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+ err = ieee80211_set_after_color_change_beacon(sdata, &changed);
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+ if (err) {
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+ cfg80211_color_change_aborted_notify(sdata->dev);
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+ return err;
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+ }
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+
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+ ieee80211_color_change_bss_config_notify(sdata,
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+ sdata->vif.color_change_color,
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+ 1, changed);
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+ cfg80211_color_change_notify(sdata->dev);
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+
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+ return 0;
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+}
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+
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+void ieee80211_color_change_finalize_work(struct work_struct *work)
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+{
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+ struct ieee80211_sub_if_data *sdata =
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+ container_of(work, struct ieee80211_sub_if_data,
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+ color_change_finalize_work);
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+ struct ieee80211_local *local = sdata->local;
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+
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+ sdata_lock(sdata);
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+ mutex_lock(&local->mtx);
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+
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+ /* AP might have been stopped while waiting for the lock. */
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+ if (!sdata->vif.color_change_active)
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+ goto unlock;
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+
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+ if (!ieee80211_sdata_running(sdata))
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+ goto unlock;
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+
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+ ieee80211_color_change_finalize(sdata);
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+
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+unlock:
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+ mutex_unlock(&local->mtx);
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+ sdata_unlock(sdata);
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+}
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+
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+void ieee80211_color_change_finish(struct ieee80211_vif *vif)
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+{
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+ struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
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+
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+ ieee80211_queue_work(&sdata->local->hw,
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+ &sdata->color_change_finalize_work);
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+}
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+EXPORT_SYMBOL_GPL(ieee80211_color_change_finish);
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+
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+void
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+ieeee80211_obss_color_collision_notify(struct ieee80211_vif *vif,
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+ u64 color_bitmap)
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+{
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+ struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
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+
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+ if (sdata->vif.color_change_active || sdata->vif.csa_active)
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+ return;
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+
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+ cfg80211_obss_color_collision_notify(sdata->dev, color_bitmap);
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+}
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+EXPORT_SYMBOL_GPL(ieeee80211_obss_color_collision_notify);
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+
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+static int
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+ieee80211_color_change(struct wiphy *wiphy, struct net_device *dev,
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+ struct cfg80211_color_change_settings *params)
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+{
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+ struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
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+ struct ieee80211_local *local = sdata->local;
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+ u32 changed = 0;
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+ int err;
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+
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+ sdata_assert_lock(sdata);
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+
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+ mutex_lock(&local->mtx);
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+
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+ /* don't allow another color change if one is already active or if csa
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+ * is active
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+ */
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+ if (sdata->vif.color_change_active || sdata->vif.csa_active) {
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+ err = -EBUSY;
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+ goto out;
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+ }
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+
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+ err = ieee80211_set_color_change_beacon(sdata, params, &changed);
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+ if (err)
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+ goto out;
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+
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+ sdata->vif.color_change_active = true;
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+ sdata->vif.color_change_color = params->color;
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+
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+ cfg80211_color_change_started_notify(sdata->dev, params->count);
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+
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+ if (changed)
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+ ieee80211_color_change_bss_config_notify(sdata, 0, 0, changed);
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+ else
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+ /* if the beacon didn't change, we can finalize immediately */
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+ ieee80211_color_change_finalize(sdata);
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+
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+out:
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+ mutex_unlock(&local->mtx);
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+
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+ return err;
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+}
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+
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const struct cfg80211_ops mac80211_config_ops = {
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.add_virtual_intf = ieee80211_add_iface,
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.del_virtual_intf = ieee80211_del_iface,
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@@ -4232,4 +4443,5 @@ const struct cfg80211_ops mac80211_confi
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.set_tid_config = ieee80211_set_tid_config,
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.reset_tid_config = ieee80211_reset_tid_config,
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.set_sar_specs = ieee80211_set_sar_specs,
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+ .color_change = ieee80211_color_change,
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};
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--- a/net/mac80211/ieee80211_i.h
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+++ b/net/mac80211/ieee80211_i.h
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@@ -248,6 +248,12 @@ struct ieee80211_csa_settings {
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u8 count;
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};
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+struct ieee80211_color_change_settings {
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+ u16 counter_offset_beacon;
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+ u16 counter_offset_presp;
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+ u8 count;
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+};
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+
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struct beacon_data {
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u8 *head, *tail;
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int head_len, tail_len;
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@@ -927,6 +933,8 @@ struct ieee80211_sub_if_data {
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bool csa_block_tx; /* write-protected by sdata_lock and local->mtx */
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struct cfg80211_chan_def csa_chandef;
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+ struct work_struct color_change_finalize_work;
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+
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struct list_head assigned_chanctx_list; /* protected by chanctx_mtx */
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struct list_head reserved_chanctx_list; /* protected by chanctx_mtx */
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@@ -1891,6 +1899,9 @@ void ieee80211_csa_finalize_work(struct
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int ieee80211_channel_switch(struct wiphy *wiphy, struct net_device *dev,
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struct cfg80211_csa_settings *params);
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+/* color change handling */
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+void ieee80211_color_change_finalize_work(struct work_struct *work);
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+
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/* interface handling */
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#define MAC80211_SUPPORTED_FEATURES_TX (NETIF_F_IP_CSUM | NETIF_F_IPV6_CSUM | \
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NETIF_F_HW_CSUM | NETIF_F_SG | \
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--- a/net/mac80211/iface.c
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+++ b/net/mac80211/iface.c
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@@ -462,6 +462,7 @@ static void ieee80211_do_stop(struct iee
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sdata_unlock(sdata);
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cancel_work_sync(&sdata->csa_finalize_work);
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+ cancel_work_sync(&sdata->color_change_finalize_work);
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cancel_delayed_work_sync(&sdata->dfs_cac_timer_work);
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@@ -1608,6 +1609,7 @@ static void ieee80211_setup_sdata(struct
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INIT_WORK(&sdata->work, ieee80211_iface_work);
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INIT_WORK(&sdata->recalc_smps, ieee80211_recalc_smps_work);
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INIT_WORK(&sdata->csa_finalize_work, ieee80211_csa_finalize_work);
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+ INIT_WORK(&sdata->color_change_finalize_work, ieee80211_color_change_finalize_work);
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INIT_LIST_HEAD(&sdata->assigned_chanctx_list);
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INIT_LIST_HEAD(&sdata->reserved_chanctx_list);
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--- a/net/mac80211/tx.c
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+++ b/net/mac80211/tx.c
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@@ -4796,11 +4796,11 @@ static int ieee80211_beacon_add_tim(stru
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static void ieee80211_set_beacon_cntdwn(struct ieee80211_sub_if_data *sdata,
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struct beacon_data *beacon)
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{
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+ u8 *beacon_data, count, max_count = 1;
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struct probe_resp *resp;
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- u8 *beacon_data;
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size_t beacon_data_len;
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+ u16 *bcn_offsets;
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int i;
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- u8 count = beacon->cntdwn_current_counter;
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switch (sdata->vif.type) {
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case NL80211_IFTYPE_AP:
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@@ -4820,21 +4820,27 @@ static void ieee80211_set_beacon_cntdwn(
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}
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rcu_read_lock();
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- for (i = 0; i < IEEE80211_MAX_CNTDWN_COUNTERS_NUM; ++i) {
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- resp = rcu_dereference(sdata->u.ap.probe_resp);
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+ resp = rcu_dereference(sdata->u.ap.probe_resp);
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- if (beacon->cntdwn_counter_offsets[i]) {
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- if (WARN_ON_ONCE(beacon->cntdwn_counter_offsets[i] >=
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- beacon_data_len)) {
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+ bcn_offsets = beacon->cntdwn_counter_offsets;
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+ count = beacon->cntdwn_current_counter;
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+ if (sdata->vif.csa_active)
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+ max_count = IEEE80211_MAX_CNTDWN_COUNTERS_NUM;
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+
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+ for (i = 0; i < max_count; ++i) {
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+ if (bcn_offsets[i]) {
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+ if (WARN_ON_ONCE(bcn_offsets[i] >= beacon_data_len)) {
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rcu_read_unlock();
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return;
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}
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-
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- beacon_data[beacon->cntdwn_counter_offsets[i]] = count;
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+ beacon_data[bcn_offsets[i]] = count;
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}
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- if (sdata->vif.type == NL80211_IFTYPE_AP && resp)
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- resp->data[resp->cntdwn_counter_offsets[i]] = count;
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+ if (sdata->vif.type == NL80211_IFTYPE_AP && resp) {
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+ u16 *resp_offsets = resp->cntdwn_counter_offsets;
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+
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+ resp->data[resp_offsets[i]] = count;
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+ }
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}
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rcu_read_unlock();
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}
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@@ -5044,6 +5050,7 @@ __ieee80211_beacon_get(struct ieee80211_
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if (offs) {
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offs->tim_offset = beacon->head_len;
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offs->tim_length = skb->len - beacon->head_len;
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+ offs->cntdwn_counter_offs[0] = beacon->cntdwn_counter_offsets[0];
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/* for AP the csa offsets are from tail */
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csa_off_base = skb->len;
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