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-rw-r--r--net/mac80211/link.c476
1 files changed, 476 insertions, 0 deletions
diff --git a/net/mac80211/link.c b/net/mac80211/link.c
new file mode 100644
index 000000000..a85b44c1b
--- /dev/null
+++ b/net/mac80211/link.c
@@ -0,0 +1,476 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * MLO link handling
+ *
+ * Copyright (C) 2022-2023 Intel Corporation
+ */
+#include <linux/slab.h>
+#include <linux/kernel.h>
+#include <net/mac80211.h>
+#include "ieee80211_i.h"
+#include "driver-ops.h"
+#include "key.h"
+
+void ieee80211_link_setup(struct ieee80211_link_data *link)
+{
+ if (link->sdata->vif.type == NL80211_IFTYPE_STATION)
+ ieee80211_mgd_setup_link(link);
+}
+
+void ieee80211_link_init(struct ieee80211_sub_if_data *sdata,
+ int link_id,
+ struct ieee80211_link_data *link,
+ struct ieee80211_bss_conf *link_conf)
+{
+ bool deflink = link_id < 0;
+
+ if (link_id < 0)
+ link_id = 0;
+
+ rcu_assign_pointer(sdata->vif.link_conf[link_id], link_conf);
+ rcu_assign_pointer(sdata->link[link_id], link);
+
+ link->sdata = sdata;
+ link->link_id = link_id;
+ link->conf = link_conf;
+ link_conf->link_id = link_id;
+
+ INIT_WORK(&link->csa_finalize_work,
+ ieee80211_csa_finalize_work);
+ INIT_WORK(&link->color_change_finalize_work,
+ ieee80211_color_change_finalize_work);
+ INIT_DELAYED_WORK(&link->color_collision_detect_work,
+ ieee80211_color_collision_detection_work);
+ INIT_LIST_HEAD(&link->assigned_chanctx_list);
+ INIT_LIST_HEAD(&link->reserved_chanctx_list);
+ INIT_DELAYED_WORK(&link->dfs_cac_timer_work,
+ ieee80211_dfs_cac_timer_work);
+
+ if (!deflink) {
+ switch (sdata->vif.type) {
+ case NL80211_IFTYPE_AP:
+ ether_addr_copy(link_conf->addr,
+ sdata->wdev.links[link_id].addr);
+ link_conf->bssid = link_conf->addr;
+ WARN_ON(!(sdata->wdev.valid_links & BIT(link_id)));
+ break;
+ case NL80211_IFTYPE_STATION:
+ /* station sets the bssid in ieee80211_mgd_setup_link */
+ break;
+ default:
+ WARN_ON(1);
+ }
+ }
+}
+
+void ieee80211_link_stop(struct ieee80211_link_data *link)
+{
+ if (link->sdata->vif.type == NL80211_IFTYPE_STATION)
+ ieee80211_mgd_stop_link(link);
+
+ cancel_delayed_work_sync(&link->color_collision_detect_work);
+ ieee80211_link_release_channel(link);
+}
+
+struct link_container {
+ struct ieee80211_link_data data;
+ struct ieee80211_bss_conf conf;
+};
+
+static void ieee80211_tear_down_links(struct ieee80211_sub_if_data *sdata,
+ struct link_container **links, u16 mask)
+{
+ struct ieee80211_link_data *link;
+ LIST_HEAD(keys);
+ unsigned int link_id;
+
+ for (link_id = 0; link_id < IEEE80211_MLD_MAX_NUM_LINKS; link_id++) {
+ if (!(mask & BIT(link_id)))
+ continue;
+ link = &links[link_id]->data;
+ if (link_id == 0 && !link)
+ link = &sdata->deflink;
+ if (WARN_ON(!link))
+ continue;
+ ieee80211_remove_link_keys(link, &keys);
+ ieee80211_link_stop(link);
+ }
+
+ synchronize_rcu();
+
+ ieee80211_free_key_list(sdata->local, &keys);
+}
+
+static void ieee80211_free_links(struct ieee80211_sub_if_data *sdata,
+ struct link_container **links)
+{
+ unsigned int link_id;
+
+ for (link_id = 0; link_id < IEEE80211_MLD_MAX_NUM_LINKS; link_id++)
+ kfree(links[link_id]);
+}
+
+static int ieee80211_check_dup_link_addrs(struct ieee80211_sub_if_data *sdata)
+{
+ unsigned int i, j;
+
+ for (i = 0; i < IEEE80211_MLD_MAX_NUM_LINKS; i++) {
+ struct ieee80211_link_data *link1;
+
+ link1 = sdata_dereference(sdata->link[i], sdata);
+ if (!link1)
+ continue;
+ for (j = i + 1; j < IEEE80211_MLD_MAX_NUM_LINKS; j++) {
+ struct ieee80211_link_data *link2;
+
+ link2 = sdata_dereference(sdata->link[j], sdata);
+ if (!link2)
+ continue;
+
+ if (ether_addr_equal(link1->conf->addr,
+ link2->conf->addr))
+ return -EALREADY;
+ }
+ }
+
+ return 0;
+}
+
+static void ieee80211_set_vif_links_bitmaps(struct ieee80211_sub_if_data *sdata,
+ u16 links)
+{
+ sdata->vif.valid_links = links;
+
+ if (!links) {
+ sdata->vif.active_links = 0;
+ return;
+ }
+
+ switch (sdata->vif.type) {
+ case NL80211_IFTYPE_AP:
+ /* in an AP all links are always active */
+ sdata->vif.active_links = links;
+ break;
+ case NL80211_IFTYPE_STATION:
+ if (sdata->vif.active_links)
+ break;
+ WARN_ON(hweight16(links) > 1);
+ sdata->vif.active_links = links;
+ break;
+ default:
+ WARN_ON(1);
+ }
+}
+
+static int ieee80211_vif_update_links(struct ieee80211_sub_if_data *sdata,
+ struct link_container **to_free,
+ u16 new_links)
+{
+ u16 old_links = sdata->vif.valid_links;
+ u16 old_active = sdata->vif.active_links;
+ unsigned long add = new_links & ~old_links;
+ unsigned long rem = old_links & ~new_links;
+ unsigned int link_id;
+ int ret;
+ struct link_container *links[IEEE80211_MLD_MAX_NUM_LINKS] = {}, *link;
+ struct ieee80211_bss_conf *old[IEEE80211_MLD_MAX_NUM_LINKS];
+ struct ieee80211_link_data *old_data[IEEE80211_MLD_MAX_NUM_LINKS];
+ bool use_deflink = old_links == 0; /* set for error case */
+
+ sdata_assert_lock(sdata);
+
+ memset(to_free, 0, sizeof(links));
+
+ if (old_links == new_links)
+ return 0;
+
+ /* if there were no old links, need to clear the pointers to deflink */
+ if (!old_links)
+ rem |= BIT(0);
+
+ /* allocate new link structures first */
+ for_each_set_bit(link_id, &add, IEEE80211_MLD_MAX_NUM_LINKS) {
+ link = kzalloc(sizeof(*link), GFP_KERNEL);
+ if (!link) {
+ ret = -ENOMEM;
+ goto free;
+ }
+ links[link_id] = link;
+ }
+
+ /* keep track of the old pointers for the driver */
+ BUILD_BUG_ON(sizeof(old) != sizeof(sdata->vif.link_conf));
+ memcpy(old, sdata->vif.link_conf, sizeof(old));
+ /* and for us in error cases */
+ BUILD_BUG_ON(sizeof(old_data) != sizeof(sdata->link));
+ memcpy(old_data, sdata->link, sizeof(old_data));
+
+ /* grab old links to free later */
+ for_each_set_bit(link_id, &rem, IEEE80211_MLD_MAX_NUM_LINKS) {
+ if (rcu_access_pointer(sdata->link[link_id]) != &sdata->deflink) {
+ /*
+ * we must have allocated the data through this path so
+ * we know we can free both at the same time
+ */
+ to_free[link_id] = container_of(rcu_access_pointer(sdata->link[link_id]),
+ typeof(*links[link_id]),
+ data);
+ }
+
+ RCU_INIT_POINTER(sdata->link[link_id], NULL);
+ RCU_INIT_POINTER(sdata->vif.link_conf[link_id], NULL);
+ }
+
+ /* link them into data structures */
+ for_each_set_bit(link_id, &add, IEEE80211_MLD_MAX_NUM_LINKS) {
+ WARN_ON(!use_deflink &&
+ rcu_access_pointer(sdata->link[link_id]) == &sdata->deflink);
+
+ link = links[link_id];
+ ieee80211_link_init(sdata, link_id, &link->data, &link->conf);
+ ieee80211_link_setup(&link->data);
+ }
+
+ if (new_links == 0)
+ ieee80211_link_init(sdata, -1, &sdata->deflink,
+ &sdata->vif.bss_conf);
+
+ ret = ieee80211_check_dup_link_addrs(sdata);
+ if (!ret) {
+ /* for keys we will not be able to undo this */
+ ieee80211_tear_down_links(sdata, to_free, rem);
+
+ ieee80211_set_vif_links_bitmaps(sdata, new_links);
+
+ /* tell the driver */
+ ret = drv_change_vif_links(sdata->local, sdata,
+ old_links & old_active,
+ new_links & sdata->vif.active_links,
+ old);
+ }
+
+ if (ret) {
+ /* restore config */
+ memcpy(sdata->link, old_data, sizeof(old_data));
+ memcpy(sdata->vif.link_conf, old, sizeof(old));
+ ieee80211_set_vif_links_bitmaps(sdata, old_links);
+ /* and free (only) the newly allocated links */
+ memset(to_free, 0, sizeof(links));
+ goto free;
+ }
+
+ /* use deflink/bss_conf again if and only if there are no more links */
+ use_deflink = new_links == 0;
+
+ goto deinit;
+free:
+ /* if we failed during allocation, only free all */
+ for (link_id = 0; link_id < IEEE80211_MLD_MAX_NUM_LINKS; link_id++) {
+ kfree(links[link_id]);
+ links[link_id] = NULL;
+ }
+deinit:
+ if (use_deflink)
+ ieee80211_link_init(sdata, -1, &sdata->deflink,
+ &sdata->vif.bss_conf);
+ return ret;
+}
+
+int ieee80211_vif_set_links(struct ieee80211_sub_if_data *sdata,
+ u16 new_links)
+{
+ struct link_container *links[IEEE80211_MLD_MAX_NUM_LINKS];
+ int ret;
+
+ ret = ieee80211_vif_update_links(sdata, links, new_links);
+ ieee80211_free_links(sdata, links);
+
+ return ret;
+}
+
+void ieee80211_vif_clear_links(struct ieee80211_sub_if_data *sdata)
+{
+ struct link_container *links[IEEE80211_MLD_MAX_NUM_LINKS];
+
+ /*
+ * The locking here is different because when we free links
+ * in the station case we need to be able to cancel_work_sync()
+ * something that also takes the lock.
+ */
+
+ sdata_lock(sdata);
+ ieee80211_vif_update_links(sdata, links, 0);
+ sdata_unlock(sdata);
+
+ ieee80211_free_links(sdata, links);
+}
+
+static int _ieee80211_set_active_links(struct ieee80211_sub_if_data *sdata,
+ u16 active_links)
+{
+ struct ieee80211_bss_conf *link_confs[IEEE80211_MLD_MAX_NUM_LINKS];
+ struct ieee80211_local *local = sdata->local;
+ u16 old_active = sdata->vif.active_links;
+ unsigned long rem = old_active & ~active_links;
+ unsigned long add = active_links & ~old_active;
+ struct sta_info *sta;
+ unsigned int link_id;
+ int ret, i;
+
+ if (!ieee80211_sdata_running(sdata))
+ return -ENETDOWN;
+
+ if (sdata->vif.type != NL80211_IFTYPE_STATION)
+ return -EINVAL;
+
+ /* cannot activate links that don't exist */
+ if (active_links & ~sdata->vif.valid_links)
+ return -EINVAL;
+
+ /* nothing to do */
+ if (old_active == active_links)
+ return 0;
+
+ for (i = 0; i < IEEE80211_MLD_MAX_NUM_LINKS; i++)
+ link_confs[i] = sdata_dereference(sdata->vif.link_conf[i],
+ sdata);
+
+ if (add) {
+ sdata->vif.active_links |= active_links;
+ ret = drv_change_vif_links(local, sdata,
+ old_active,
+ sdata->vif.active_links,
+ link_confs);
+ if (ret) {
+ sdata->vif.active_links = old_active;
+ return ret;
+ }
+ }
+
+ for_each_set_bit(link_id, &rem, IEEE80211_MLD_MAX_NUM_LINKS) {
+ struct ieee80211_link_data *link;
+
+ link = sdata_dereference(sdata->link[link_id], sdata);
+
+ /* FIXME: kill TDLS connections on the link */
+
+ ieee80211_link_release_channel(link);
+ }
+
+ list_for_each_entry(sta, &local->sta_list, list) {
+ if (sdata != sta->sdata)
+ continue;
+ ret = drv_change_sta_links(local, sdata, &sta->sta,
+ old_active,
+ old_active | active_links);
+ WARN_ON_ONCE(ret);
+ }
+
+ ret = ieee80211_key_switch_links(sdata, rem, add);
+ WARN_ON_ONCE(ret);
+
+ list_for_each_entry(sta, &local->sta_list, list) {
+ if (sdata != sta->sdata)
+ continue;
+ ret = drv_change_sta_links(local, sdata, &sta->sta,
+ old_active | active_links,
+ active_links);
+ WARN_ON_ONCE(ret);
+ }
+
+ for_each_set_bit(link_id, &add, IEEE80211_MLD_MAX_NUM_LINKS) {
+ struct ieee80211_link_data *link;
+
+ link = sdata_dereference(sdata->link[link_id], sdata);
+
+ ret = ieee80211_link_use_channel(link, &link->conf->chandef,
+ IEEE80211_CHANCTX_SHARED);
+ WARN_ON_ONCE(ret);
+
+ ieee80211_mgd_set_link_qos_params(link);
+ ieee80211_link_info_change_notify(sdata, link,
+ BSS_CHANGED_ERP_CTS_PROT |
+ BSS_CHANGED_ERP_PREAMBLE |
+ BSS_CHANGED_ERP_SLOT |
+ BSS_CHANGED_HT |
+ BSS_CHANGED_BASIC_RATES |
+ BSS_CHANGED_BSSID |
+ BSS_CHANGED_CQM |
+ BSS_CHANGED_QOS |
+ BSS_CHANGED_TXPOWER |
+ BSS_CHANGED_BANDWIDTH |
+ BSS_CHANGED_TWT |
+ BSS_CHANGED_HE_OBSS_PD |
+ BSS_CHANGED_HE_BSS_COLOR);
+ }
+
+ old_active = sdata->vif.active_links;
+ sdata->vif.active_links = active_links;
+
+ if (rem) {
+ ret = drv_change_vif_links(local, sdata, old_active,
+ active_links, link_confs);
+ WARN_ON_ONCE(ret);
+ }
+
+ return 0;
+}
+
+int ieee80211_set_active_links(struct ieee80211_vif *vif, u16 active_links)
+{
+ struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
+ struct ieee80211_local *local = sdata->local;
+ u16 old_active;
+ int ret;
+
+ sdata_lock(sdata);
+ mutex_lock(&local->sta_mtx);
+ mutex_lock(&local->mtx);
+ mutex_lock(&local->key_mtx);
+ old_active = sdata->vif.active_links;
+ if (old_active & active_links) {
+ /*
+ * if there's at least one link that stays active across
+ * the change then switch to it (to those) first, and
+ * then enable the additional links
+ */
+ ret = _ieee80211_set_active_links(sdata,
+ old_active & active_links);
+ if (!ret)
+ ret = _ieee80211_set_active_links(sdata, active_links);
+ } else {
+ /* otherwise switch directly */
+ ret = _ieee80211_set_active_links(sdata, active_links);
+ }
+ mutex_unlock(&local->key_mtx);
+ mutex_unlock(&local->mtx);
+ mutex_unlock(&local->sta_mtx);
+ sdata_unlock(sdata);
+
+ return ret;
+}
+EXPORT_SYMBOL_GPL(ieee80211_set_active_links);
+
+void ieee80211_set_active_links_async(struct ieee80211_vif *vif,
+ u16 active_links)
+{
+ struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
+
+ if (!ieee80211_sdata_running(sdata))
+ return;
+
+ if (sdata->vif.type != NL80211_IFTYPE_STATION)
+ return;
+
+ /* cannot activate links that don't exist */
+ if (active_links & ~sdata->vif.valid_links)
+ return;
+
+ /* nothing to do */
+ if (sdata->vif.active_links == active_links)
+ return;
+
+ sdata->desired_active_links = active_links;
+ schedule_work(&sdata->activate_links_work);
+}
+EXPORT_SYMBOL_GPL(ieee80211_set_active_links_async);