[thirdparty/linux.git] / net / mac80211 / link.c

// 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"
#include "debugfs_netdev.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;
	link_conf->vif = &sdata->vif;

	wiphy_work_init(&link->csa_finalize_work,
			ieee80211_csa_finalize_work);
	wiphy_work_init(&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);
	wiphy_delayed_work_init(&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);
		}

		ieee80211_link_debugfs_add(link);
	}
}

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_debugfs_remove(link);
		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 valid_links, u16 dormant_links)
{
	sdata->vif.valid_links = valid_links;
	sdata->vif.dormant_links = dormant_links;

	if (!valid_links ||
	    WARN((~valid_links & dormant_links) ||
		 !(valid_links & ~dormant_links),
		 "Invalid links: valid=0x%x, dormant=0x%x",
		 valid_links, dormant_links)) {
		sdata->vif.active_links = 0;
		sdata->vif.dormant_links = 0;
		return;
	}

	switch (sdata->vif.type) {
	case NL80211_IFTYPE_AP:
		/* in an AP all links are always active */
		sdata->vif.active_links = valid_links;

		/* AP links are not expected to be disabled */
		WARN_ON(dormant_links);
		break;
	case NL80211_IFTYPE_STATION:
		if (sdata->vif.active_links)
			break;
		sdata->vif.active_links = valid_links & ~dormant_links;
		WARN_ON(hweight16(sdata->vif.active_links) > 1);
		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 dormant_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 */

	lockdep_assert_wiphy(sdata->local->hw.wiphy);

	memset(to_free, 0, sizeof(links));

	if (old_links == new_links && dormant_links == sdata->vif.dormant_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);
	}

	if (!old_links)
		ieee80211_debugfs_recreate_netdev(sdata, true);

	/* 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, dormant_links);

		/* tell the driver */
		ret = drv_change_vif_links(sdata->local, sdata,
					   old_links & old_active,
					   new_links & sdata->vif.active_links,
					   old);
		if (!new_links)
			ieee80211_debugfs_recreate_netdev(sdata, false);
	}

	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, dormant_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, u16 dormant_links)
{
	struct link_container *links[IEEE80211_MLD_MAX_NUM_LINKS];
	int ret;

	ret = ieee80211_vif_update_links(sdata, links, new_links,
					 dormant_links);
	ieee80211_free_links(sdata, links);

	return ret;
}

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;

	if (active_links & ~ieee80211_vif_usable_links(&sdata->vif))
		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;

		/* this is very temporary, but do it anyway */
		__ieee80211_sta_recalc_aggregates(sta,
						  old_active | active_links);

		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;

		__ieee80211_sta_recalc_aggregates(sta, active_links);

		ret = drv_change_sta_links(local, sdata, &sta->sta,
					   old_active | active_links,
					   active_links);
		WARN_ON_ONCE(ret);

		/*
		 * Do it again, just in case - the driver might very
		 * well have called ieee80211_sta_recalc_aggregates()
		 * from there when filling in the new links, which
		 * would set it wrong since the vif's active links are
		 * not switched yet...
		 */
		__ieee80211_sta_recalc_aggregates(sta, active_links);
	}

	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;

	lockdep_assert_wiphy(local->hw.wiphy);

	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);
	}

	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;

	if (active_links & ~ieee80211_vif_usable_links(&sdata->vif))
		return;

	/* nothing to do */
	if (sdata->vif.active_links == active_links)
		return;

	sdata->desired_active_links = active_links;
	wiphy_work_queue(sdata->local->hw.wiphy, &sdata->activate_links_work);
}
EXPORT_SYMBOL_GPL(ieee80211_set_active_links_async);
Commit	Line	Data
e73b5e51 JB	1	// SPDX-License-Identifier: GPL-2.0-only
	2	/*
	3	* MLO link handling
	4	*
01605ad6	5	* Copyright (C) 2022-2023 Intel Corporation
e73b5e51 JB	6	*/
	7	#include <linux/slab.h>
	8	#include <linux/kernel.h>
	9	#include <net/mac80211.h>
	10	#include "ieee80211_i.h"
	11	#include "driver-ops.h"
3d901102	12	#include "key.h"
170cd6a6	13	#include "debugfs_netdev.h"
e73b5e51 JB	14
	15	void ieee80211_link_setup(struct ieee80211_link_data *link)
	16	{
	17	if (link->sdata->vif.type == NL80211_IFTYPE_STATION)
	18	ieee80211_mgd_setup_link(link);
	19	}
	20
	21	void ieee80211_link_init(struct ieee80211_sub_if_data *sdata,
	22	int link_id,
	23	struct ieee80211_link_data *link,
	24	struct ieee80211_bss_conf *link_conf)
	25	{
	26	bool deflink = link_id < 0;
	27
	28	if (link_id < 0)
	29	link_id = 0;
	30
	31	rcu_assign_pointer(sdata->vif.link_conf[link_id], link_conf);
	32	rcu_assign_pointer(sdata->link[link_id], link);
	33
	34	link->sdata = sdata;
	35	link->link_id = link_id;
	36	link->conf = link_conf;
	37	link_conf->link_id = link_id;
e1f113cc	38	link_conf->vif = &sdata->vif;
e73b5e51	39
d7074be6 JB	40	wiphy_work_init(&link->csa_finalize_work,
d7074be6 JB	41	ieee80211_csa_finalize_work);
b38579ae JB	42	wiphy_work_init(&link->color_change_finalize_work,
b38579ae JB	43	ieee80211_color_change_finalize_work);
92881884 LB	44	INIT_DELAYED_WORK(&link->color_collision_detect_work,
92881884 LB	45	ieee80211_color_collision_detection_work);
e73b5e51 JB	46	INIT_LIST_HEAD(&link->assigned_chanctx_list);
e73b5e51 JB	47	INIT_LIST_HEAD(&link->reserved_chanctx_list);
766d2601 JB	48	wiphy_delayed_work_init(&link->dfs_cac_timer_work,
766d2601 JB	49	ieee80211_dfs_cac_timer_work);
e73b5e51 JB	50
	51	if (!deflink) {
	52	switch (sdata->vif.type) {
	53	case NL80211_IFTYPE_AP:
	54	ether_addr_copy(link_conf->addr,
	55	sdata->wdev.links[link_id].addr);
	56	link_conf->bssid = link_conf->addr;
	57	WARN_ON(!(sdata->wdev.valid_links & BIT(link_id)));
	58	break;
	59	case NL80211_IFTYPE_STATION:
	60	/* station sets the bssid in ieee80211_mgd_setup_link */
	61	break;
	62	default:
	63	WARN_ON(1);
	64	}
170cd6a6 BB	65
170cd6a6 BB	66	ieee80211_link_debugfs_add(link);
e73b5e51 JB	67	}
	68	}
	69
	70	void ieee80211_link_stop(struct ieee80211_link_data *link)
	71	{
	72	if (link->sdata->vif.type == NL80211_IFTYPE_STATION)
	73	ieee80211_mgd_stop_link(link);
	74
92881884	75	cancel_delayed_work_sync(&link->color_collision_detect_work);
e73b5e51 JB	76	ieee80211_link_release_channel(link);
	77	}
	78
	79	struct link_container {
	80	struct ieee80211_link_data data;
	81	struct ieee80211_bss_conf conf;
	82	};
	83
efe9c2bf JB	84	static void ieee80211_tear_down_links(struct ieee80211_sub_if_data *sdata,
efe9c2bf JB	85	struct link_container **links, u16 mask)
e73b5e51	86	{
efe9c2bf	87	struct ieee80211_link_data *link;
e73b5e51 JB	88	LIST_HEAD(keys);
	89	unsigned int link_id;
	90
	91	for (link_id = 0; link_id < IEEE80211_MLD_MAX_NUM_LINKS; link_id++) {
efe9c2bf JB	92	if (!(mask & BIT(link_id)))
	93	continue;
	94	link = &links[link_id]->data;
	95	if (link_id == 0 && !link)
	96	link = &sdata->deflink;
	97	if (WARN_ON(!link))
e73b5e51	98	continue;
efe9c2bf	99	ieee80211_remove_link_keys(link, &keys);
170cd6a6	100	ieee80211_link_debugfs_remove(link);
efe9c2bf	101	ieee80211_link_stop(link);
e73b5e51 JB	102	}
	103
	104	synchronize_rcu();
	105
	106	ieee80211_free_key_list(sdata->local, &keys);
efe9c2bf	107	}
e73b5e51	108
efe9c2bf JB	109	static void ieee80211_free_links(struct ieee80211_sub_if_data *sdata,
	110	struct link_container **links)
	111	{
	112	unsigned int link_id;
	113
	114	for (link_id = 0; link_id < IEEE80211_MLD_MAX_NUM_LINKS; link_id++)
e73b5e51	115	kfree(links[link_id]);
e73b5e51 JB	116	}
	117
	118	static int ieee80211_check_dup_link_addrs(struct ieee80211_sub_if_data *sdata)
	119	{
	120	unsigned int i, j;
	121
	122	for (i = 0; i < IEEE80211_MLD_MAX_NUM_LINKS; i++) {
	123	struct ieee80211_link_data *link1;
	124
	125	link1 = sdata_dereference(sdata->link[i], sdata);
	126	if (!link1)
	127	continue;
	128	for (j = i + 1; j < IEEE80211_MLD_MAX_NUM_LINKS; j++) {
	129	struct ieee80211_link_data *link2;
	130
	131	link2 = sdata_dereference(sdata->link[j], sdata);
	132	if (!link2)
	133	continue;
	134
	135	if (ether_addr_equal(link1->conf->addr,
	136	link2->conf->addr))
	137	return -EALREADY;
	138	}
	139	}
	140
	141	return 0;
	142	}
	143
efe9c2bf	144	static void ieee80211_set_vif_links_bitmaps(struct ieee80211_sub_if_data *sdata,
6d543b34	145	u16 valid_links, u16 dormant_links)
efe9c2bf	146	{
6d543b34 IP	147	sdata->vif.valid_links = valid_links;
	148	sdata->vif.dormant_links = dormant_links;
	149
	150	if (!valid_links \|\|
	151	WARN((~valid_links & dormant_links) \|\|
	152	!(valid_links & ~dormant_links),
	153	"Invalid links: valid=0x%x, dormant=0x%x",
	154	valid_links, dormant_links)) {
efe9c2bf	155	sdata->vif.active_links = 0;
6d543b34	156	sdata->vif.dormant_links = 0;
efe9c2bf JB	157	return;
	158	}
	159
	160	switch (sdata->vif.type) {
	161	case NL80211_IFTYPE_AP:
	162	/* in an AP all links are always active */
6d543b34 IP	163	sdata->vif.active_links = valid_links;
	164
	165	/* AP links are not expected to be disabled */
	166	WARN_ON(dormant_links);
efe9c2bf JB	167	break;
	168	case NL80211_IFTYPE_STATION:
	169	if (sdata->vif.active_links)
	170	break;
6d543b34 IP	171	sdata->vif.active_links = valid_links & ~dormant_links;
6d543b34 IP	172	WARN_ON(hweight16(sdata->vif.active_links) > 1);
efe9c2bf JB	173	break;
	174	default:
	175	WARN_ON(1);
	176	}
	177	}
	178
e73b5e51 JB	179	static int ieee80211_vif_update_links(struct ieee80211_sub_if_data *sdata,
e73b5e51 JB	180	struct link_container **to_free,
6d543b34	181	u16 new_links, u16 dormant_links)
e73b5e51 JB	182	{
e73b5e51 JB	183	u16 old_links = sdata->vif.valid_links;
efe9c2bf	184	u16 old_active = sdata->vif.active_links;
e73b5e51 JB	185	unsigned long add = new_links & ~old_links;
	186	unsigned long rem = old_links & ~new_links;
	187	unsigned int link_id;
	188	int ret;
	189	struct link_container links[IEEE80211_MLD_MAX_NUM_LINKS] = {}, link;
	190	struct ieee80211_bss_conf *old[IEEE80211_MLD_MAX_NUM_LINKS];
	191	struct ieee80211_link_data *old_data[IEEE80211_MLD_MAX_NUM_LINKS];
	192	bool use_deflink = old_links == 0; /* set for error case */
	193
076fc877	194	lockdep_assert_wiphy(sdata->local->hw.wiphy);
e73b5e51 JB	195
	196	memset(to_free, 0, sizeof(links));
	197
e7182c4e	198	if (old_links == new_links && dormant_links == sdata->vif.dormant_links)
e73b5e51 JB	199	return 0;
	200
	201	/* if there were no old links, need to clear the pointers to deflink */
	202	if (!old_links)
	203	rem \|= BIT(0);
	204
	205	/* allocate new link structures first */
	206	for_each_set_bit(link_id, &add, IEEE80211_MLD_MAX_NUM_LINKS) {
	207	link = kzalloc(sizeof(*link), GFP_KERNEL);
	208	if (!link) {
	209	ret = -ENOMEM;
	210	goto free;
	211	}
	212	links[link_id] = link;
	213	}
	214
	215	/* keep track of the old pointers for the driver */
	216	BUILD_BUG_ON(sizeof(old) != sizeof(sdata->vif.link_conf));
	217	memcpy(old, sdata->vif.link_conf, sizeof(old));
	218	/* and for us in error cases */
	219	BUILD_BUG_ON(sizeof(old_data) != sizeof(sdata->link));
	220	memcpy(old_data, sdata->link, sizeof(old_data));
	221
	222	/* grab old links to free later */
	223	for_each_set_bit(link_id, &rem, IEEE80211_MLD_MAX_NUM_LINKS) {
	224	if (rcu_access_pointer(sdata->link[link_id]) != &sdata->deflink) {
	225	/*
	226	* we must have allocated the data through this path so
	227	* we know we can free both at the same time
	228	*/
	229	to_free[link_id] = container_of(rcu_access_pointer(sdata->link[link_id]),
	230	typeof(*links[link_id]),
	231	data);
	232	}
	233
	234	RCU_INIT_POINTER(sdata->link[link_id], NULL);
	235	RCU_INIT_POINTER(sdata->vif.link_conf[link_id], NULL);
	236	}
	237
c942398f MK	238	if (!old_links)
	239	ieee80211_debugfs_recreate_netdev(sdata, true);
	240
e73b5e51 JB	241	/* link them into data structures */
	242	for_each_set_bit(link_id, &add, IEEE80211_MLD_MAX_NUM_LINKS) {
	243	WARN_ON(!use_deflink &&
	244	rcu_access_pointer(sdata->link[link_id]) == &sdata->deflink);
	245
	246	link = links[link_id];
	247	ieee80211_link_init(sdata, link_id, &link->data, &link->conf);
	248	ieee80211_link_setup(&link->data);
	249	}
	250
	251	if (new_links == 0)
	252	ieee80211_link_init(sdata, -1, &sdata->deflink,
	253	&sdata->vif.bss_conf);
	254
e73b5e51 JB	255	ret = ieee80211_check_dup_link_addrs(sdata);
e73b5e51 JB	256	if (!ret) {
efe9c2bf JB	257	/* for keys we will not be able to undo this */
	258	ieee80211_tear_down_links(sdata, to_free, rem);
	259
6d543b34	260	ieee80211_set_vif_links_bitmaps(sdata, new_links, dormant_links);
efe9c2bf	261
e73b5e51 JB	262	/* tell the driver */
e73b5e51 JB	263	ret = drv_change_vif_links(sdata->local, sdata,
efe9c2bf JB	264	old_links & old_active,
efe9c2bf JB	265	new_links & sdata->vif.active_links,
e73b5e51	266	old);
c942398f MK	267	if (!new_links)
c942398f MK	268	ieee80211_debugfs_recreate_netdev(sdata, false);
e73b5e51 JB	269	}
	270
	271	if (ret) {
	272	/* restore config */
	273	memcpy(sdata->link, old_data, sizeof(old_data));
	274	memcpy(sdata->vif.link_conf, old, sizeof(old));
6d543b34	275	ieee80211_set_vif_links_bitmaps(sdata, old_links, dormant_links);
e73b5e51 JB	276	/* and free (only) the newly allocated links */
	277	memset(to_free, 0, sizeof(links));
	278	goto free;
	279	}
	280
	281	/* use deflink/bss_conf again if and only if there are no more links */
	282	use_deflink = new_links == 0;
	283
	284	goto deinit;
	285	free:
	286	/* if we failed during allocation, only free all */
	287	for (link_id = 0; link_id < IEEE80211_MLD_MAX_NUM_LINKS; link_id++) {
	288	kfree(links[link_id]);
	289	links[link_id] = NULL;
	290	}
	291	deinit:
	292	if (use_deflink)
	293	ieee80211_link_init(sdata, -1, &sdata->deflink,
	294	&sdata->vif.bss_conf);
	295	return ret;
	296	}
	297
	298	int ieee80211_vif_set_links(struct ieee80211_sub_if_data *sdata,
6d543b34	299	u16 new_links, u16 dormant_links)
e73b5e51 JB	300	{
	301	struct link_container *links[IEEE80211_MLD_MAX_NUM_LINKS];
	302	int ret;
	303
6d543b34 IP	304	ret = ieee80211_vif_update_links(sdata, links, new_links,
6d543b34 IP	305	dormant_links);
e73b5e51 JB	306	ieee80211_free_links(sdata, links);
	307
	308	return ret;
	309	}
	310
3d901102 JB	311	static int _ieee80211_set_active_links(struct ieee80211_sub_if_data *sdata,
	312	u16 active_links)
	313	{
	314	struct ieee80211_bss_conf *link_confs[IEEE80211_MLD_MAX_NUM_LINKS];
	315	struct ieee80211_local *local = sdata->local;
	316	u16 old_active = sdata->vif.active_links;
	317	unsigned long rem = old_active & ~active_links;
	318	unsigned long add = active_links & ~old_active;
	319	struct sta_info *sta;
	320	unsigned int link_id;
	321	int ret, i;
	322
	323	if (!ieee80211_sdata_running(sdata))
	324	return -ENETDOWN;
	325
	326	if (sdata->vif.type != NL80211_IFTYPE_STATION)
	327	return -EINVAL;
	328
f1871abd	329	if (active_links & ~ieee80211_vif_usable_links(&sdata->vif))
3d901102 JB	330	return -EINVAL;
	331
	332	/* nothing to do */
	333	if (old_active == active_links)
	334	return 0;
	335
	336	for (i = 0; i < IEEE80211_MLD_MAX_NUM_LINKS; i++)
	337	link_confs[i] = sdata_dereference(sdata->vif.link_conf[i],
	338	sdata);
	339
	340	if (add) {
	341	sdata->vif.active_links \|= active_links;
	342	ret = drv_change_vif_links(local, sdata,
	343	old_active,
	344	sdata->vif.active_links,
	345	link_confs);
	346	if (ret) {
	347	sdata->vif.active_links = old_active;
	348	return ret;
	349	}
	350	}
	351
	352	for_each_set_bit(link_id, &rem, IEEE80211_MLD_MAX_NUM_LINKS) {
	353	struct ieee80211_link_data *link;
	354
	355	link = sdata_dereference(sdata->link[link_id], sdata);
	356
	357	/* FIXME: kill TDLS connections on the link */
	358
	359	ieee80211_link_release_channel(link);
	360	}
	361
	362	list_for_each_entry(sta, &local->sta_list, list) {
	363	if (sdata != sta->sdata)
	364	continue;
9b41a9d7 JB	365
	366	/* this is very temporary, but do it anyway */
	367	__ieee80211_sta_recalc_aggregates(sta,
	368	old_active \| active_links);
	369
3d901102 JB	370	ret = drv_change_sta_links(local, sdata, &sta->sta,
	371	old_active,
	372	old_active \| active_links);
	373	WARN_ON_ONCE(ret);
	374	}
	375
	376	ret = ieee80211_key_switch_links(sdata, rem, add);
	377	WARN_ON_ONCE(ret);
	378
	379	list_for_each_entry(sta, &local->sta_list, list) {
	380	if (sdata != sta->sdata)
	381	continue;
9b41a9d7 JB	382
	383	__ieee80211_sta_recalc_aggregates(sta, active_links);
	384
3d901102 JB	385	ret = drv_change_sta_links(local, sdata, &sta->sta,
	386	old_active \| active_links,
	387	active_links);
	388	WARN_ON_ONCE(ret);
9b41a9d7 JB	389
	390	/*
	391	* Do it again, just in case - the driver might very
	392	* well have called ieee80211_sta_recalc_aggregates()
	393	* from there when filling in the new links, which
	394	* would set it wrong since the vif's active links are
	395	* not switched yet...
	396	*/
	397	__ieee80211_sta_recalc_aggregates(sta, active_links);
3d901102 JB	398	}
	399
	400	for_each_set_bit(link_id, &add, IEEE80211_MLD_MAX_NUM_LINKS) {
	401	struct ieee80211_link_data *link;
	402
	403	link = sdata_dereference(sdata->link[link_id], sdata);
	404
	405	ret = ieee80211_link_use_channel(link, &link->conf->chandef,
	406	IEEE80211_CHANCTX_SHARED);
	407	WARN_ON_ONCE(ret);
	408
01605ad6	409	ieee80211_mgd_set_link_qos_params(link);
3d901102 JB	410	ieee80211_link_info_change_notify(sdata, link,
	411	BSS_CHANGED_ERP_CTS_PROT \|
	412	BSS_CHANGED_ERP_PREAMBLE \|
	413	BSS_CHANGED_ERP_SLOT \|
	414	BSS_CHANGED_HT \|
	415	BSS_CHANGED_BASIC_RATES \|
	416	BSS_CHANGED_BSSID \|
	417	BSS_CHANGED_CQM \|
	418	BSS_CHANGED_QOS \|
	419	BSS_CHANGED_TXPOWER \|
	420	BSS_CHANGED_BANDWIDTH \|
	421	BSS_CHANGED_TWT \|
	422	BSS_CHANGED_HE_OBSS_PD \|
	423	BSS_CHANGED_HE_BSS_COLOR);
3d901102 JB	424	}
	425
	426	old_active = sdata->vif.active_links;
	427	sdata->vif.active_links = active_links;
	428
	429	if (rem) {
	430	ret = drv_change_vif_links(local, sdata, old_active,
	431	active_links, link_confs);
	432	WARN_ON_ONCE(ret);
	433	}
	434
	435	return 0;
	436	}
	437
076fc877	438	int ieee80211_set_active_links(struct ieee80211_vif *vif, u16 active_links)
3d901102 JB	439	{
	440	struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
	441	struct ieee80211_local *local = sdata->local;
	442	u16 old_active;
	443	int ret;
	444
4d3acf43	445	lockdep_assert_wiphy(local->hw.wiphy);
2a8b665e	446
3d901102 JB	447	old_active = sdata->vif.active_links;
	448	if (old_active & active_links) {
	449	/*
	450	* if there's at least one link that stays active across
	451	* the change then switch to it (to those) first, and
	452	* then enable the additional links
	453	*/
	454	ret = _ieee80211_set_active_links(sdata,
	455	old_active & active_links);
	456	if (!ret)
	457	ret = _ieee80211_set_active_links(sdata, active_links);
	458	} else {
	459	/* otherwise switch directly */
	460	ret = _ieee80211_set_active_links(sdata, active_links);
	461	}
79973d5c BB	462
	463	return ret;
	464	}
3d901102 JB	465	EXPORT_SYMBOL_GPL(ieee80211_set_active_links);
	466
	467	void ieee80211_set_active_links_async(struct ieee80211_vif *vif,
	468	u16 active_links)
	469	{
	470	struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
	471
	472	if (!ieee80211_sdata_running(sdata))
	473	return;
	474
	475	if (sdata->vif.type != NL80211_IFTYPE_STATION)
	476	return;
	477
f1871abd	478	if (active_links & ~ieee80211_vif_usable_links(&sdata->vif))
3d901102 JB	479	return;
	480
	481	/* nothing to do */
	482	if (sdata->vif.active_links == active_links)
	483	return;
	484
	485	sdata->desired_active_links = active_links;
7206a948	486	wiphy_work_queue(sdata->local->hw.wiphy, &sdata->activate_links_work);
3d901102 JB	487	}
3d901102 JB	488	EXPORT_SYMBOL_GPL(ieee80211_set_active_links_async);