// SPDX-License-Identifier: GPL-2.0/* * Portions * Copyright (C) 2022-2024 Intel Corporation */#include <linux/ieee80211.h>#include <linux/export.h>#include <net/cfg80211.h>#include "nl80211.h"#include "core.h"#include "rdev-ops.h" /* Default values, timeouts in ms */#define MESH_TTL 		31#define MESH_DEFAULT_ELEMENT_TTL 31#define MESH_MAX_RETR	 	3#define MESH_RET_T 		100#define MESH_CONF_T 		100#define MESH_HOLD_T 		100 #define MESH_PATH_TIMEOUT	5000#define MESH_RANN_INTERVAL      5000#define MESH_PATH_TO_ROOT_TIMEOUT      6000#define MESH_ROOT_INTERVAL     5000#define MESH_ROOT_CONFIRMATION_INTERVAL 2000#define MESH_DEFAULT_PLINK_TIMEOUT	1800 /* timeout in seconds */ /* * Minimum interval between two consecutive PREQs originated by the same * interface */#define MESH_PREQ_MIN_INT	10#define MESH_PERR_MIN_INT	100#define MESH_DIAM_TRAVERSAL_TIME 50 #define MESH_RSSI_THRESHOLD	0 /* * A path will be refreshed if it is used PATH_REFRESH_TIME milliseconds * before timing out.  This way it will remain ACTIVE and no data frames * will be unnecessarily held in the pending queue. */#define MESH_PATH_REFRESH_TIME			1000#define MESH_MIN_DISCOVERY_TIMEOUT (2 * MESH_DIAM_TRAVERSAL_TIME) /* Default maximum number of established plinks per interface */#define MESH_MAX_ESTAB_PLINKS	32 #define MESH_MAX_PREQ_RETRIES	4 #define MESH_SYNC_NEIGHBOR_OFFSET_MAX 50 #define MESH_DEFAULT_BEACON_INTERVAL	1000	/* in 1024 us units (=TUs) */#define MESH_DEFAULT_DTIM_PERIOD	2#define MESH_DEFAULT_AWAKE_WINDOW	10	/* in 1024 us units (=TUs) */ const struct mesh_config default_mesh_config = {	.dot11MeshRetryTimeout = MESH_RET_T,	.dot11MeshConfirmTimeout = MESH_CONF_T,	.dot11MeshHoldingTimeout = MESH_HOLD_T,	.dot11MeshMaxRetries = MESH_MAX_RETR,	.dot11MeshTTL = MESH_TTL,	.element_ttl = MESH_DEFAULT_ELEMENT_TTL,	.auto_open_plinks = true,	.dot11MeshMaxPeerLinks = MESH_MAX_ESTAB_PLINKS,	.dot11MeshNbrOffsetMaxNeighbor = MESH_SYNC_NEIGHBOR_OFFSET_MAX,	.dot11MeshHWMPactivePathTimeout = MESH_PATH_TIMEOUT,	.dot11MeshHWMPpreqMinInterval = MESH_PREQ_MIN_INT,	.dot11MeshHWMPperrMinInterval = MESH_PERR_MIN_INT,	.dot11MeshHWMPnetDiameterTraversalTime = MESH_DIAM_TRAVERSAL_TIME,	.dot11MeshHWMPmaxPREQretries = MESH_MAX_PREQ_RETRIES,	.path_refresh_time = MESH_PATH_REFRESH_TIME,	.min_discovery_timeout = MESH_MIN_DISCOVERY_TIMEOUT,	.dot11MeshHWMPRannInterval = MESH_RANN_INTERVAL,	.dot11MeshGateAnnouncementProtocol = false,	.dot11MeshForwarding = true,	.rssi_threshold = MESH_RSSI_THRESHOLD,	.ht_opmode = IEEE80211_HT_OP_MODE_PROTECTION_NONHT_MIXED,	.dot11MeshHWMPactivePathToRootTimeout = MESH_PATH_TO_ROOT_TIMEOUT,	.dot11MeshHWMProotInterval = MESH_ROOT_INTERVAL,	.dot11MeshHWMPconfirmationInterval = MESH_ROOT_CONFIRMATION_INTERVAL,	.power_mode = NL80211_MESH_POWER_ACTIVE,	.dot11MeshAwakeWindowDuration = MESH_DEFAULT_AWAKE_WINDOW,	.plink_timeout = MESH_DEFAULT_PLINK_TIMEOUT,	.dot11MeshNolearn = false,}; const struct mesh_setup default_mesh_setup = {	/* cfg80211_join_mesh() will pick a channel if needed */	.sync_method = IEEE80211_SYNC_METHOD_NEIGHBOR_OFFSET,	.path_sel_proto = IEEE80211_PATH_PROTOCOL_HWMP,	.path_metric = IEEE80211_PATH_METRIC_AIRTIME,	.auth_id = 0, /* open */	.ie = NULL,	.ie_len = 0,	.is_secure = false,	.user_mpm = false,	.beacon_interval = MESH_DEFAULT_BEACON_INTERVAL,	.dtim_period = MESH_DEFAULT_DTIM_PERIOD,}; int __cfg80211_join_mesh(struct cfg80211_registered_device *rdev,			 struct net_device *dev,			 struct mesh_setup *setup,			 const struct mesh_config *conf){	struct wireless_dev *wdev = dev->ieee80211_ptr;	int err; 	BUILD_BUG_ON(IEEE80211_MAX_SSID_LEN != IEEE80211_MAX_MESH_ID_LEN); 	lockdep_assert_wiphy(wdev->wiphy); 	if (dev->ieee80211_ptr->iftype != NL80211_IFTYPE_MESH_POINT)		return -EOPNOTSUPP; 	if (!(rdev->wiphy.flags & WIPHY_FLAG_MESH_AUTH) &&	      setup->is_secure)		return -EOPNOTSUPP; 	if (wdev->u.mesh.id_len)		return -EALREADY; 	if (!setup->mesh_id_len)		return -EINVAL; 	if (!rdev->ops->join_mesh)		return -EOPNOTSUPP; 	if (wdev->links[0].cac_started)		return -EBUSY; 	if (!setup->chandef.chan) {		/* if no channel explicitly given, use preset channel */		setup->chandef = wdev->u.mesh.preset_chandef;	} 	if (!setup->chandef.chan) {		/* if we don't have that either, use the first usable channel */		enum nl80211_band band; 		for (band = 0; band < NUM_NL80211_BANDS; band++) {			struct ieee80211_supported_band *sband;			struct ieee80211_channel *chan;			int i; 			sband = rdev->wiphy.bands[band];			if (!sband)				continue; 			for (i = 0; i < sband->n_channels; i++) {				chan = &sband->channels[i];				if (chan->flags & (IEEE80211_CHAN_NO_IR |						   IEEE80211_CHAN_DISABLED |						   IEEE80211_CHAN_RADAR))					continue;				setup->chandef.chan = chan;				break;			} 			if (setup->chandef.chan)				break;		} 		/* no usable channel ... */		if (!setup->chandef.chan)			return -EINVAL; 		setup->chandef.width = NL80211_CHAN_WIDTH_20_NOHT;		setup->chandef.center_freq1 = setup->chandef.chan->center_freq;	} 	/*	 * check if basic rates are available otherwise use mandatory rates as	 * basic rates	 */	if (!setup->basic_rates) {		struct ieee80211_supported_band *sband =				rdev->wiphy.bands[setup->chandef.chan->band]; 		if (setup->chandef.chan->band == NL80211_BAND_2GHZ) {			int i; 			/*			 * Older versions selected the mandatory rates for			 * 2.4 GHz as well, but were broken in that only			 * 1 Mbps was regarded as a mandatory rate. Keep			 * using just 1 Mbps as the default basic rate for			 * mesh to be interoperable with older versions.			 */			for (i = 0; i < sband->n_bitrates; i++) {				if (sband->bitrates[i].bitrate == 10) {					setup->basic_rates = BIT(i);					break;				}			}		} else {			setup->basic_rates = ieee80211_mandatory_rates(sband);		}	} 	err = cfg80211_chandef_dfs_required(&rdev->wiphy,					    &setup->chandef,					    NL80211_IFTYPE_MESH_POINT);	if (err < 0)		return err;	if (err > 0 && !setup->userspace_handles_dfs)		return -EINVAL; 	if (!cfg80211_reg_can_beacon(&rdev->wiphy, &setup->chandef,				     NL80211_IFTYPE_MESH_POINT))		return -EINVAL; 	err = rdev_join_mesh(rdev, dev, conf, setup);	if (!err) {		memcpy(wdev->u.mesh.id, setup->mesh_id, setup->mesh_id_len);		wdev->u.mesh.id_len = setup->mesh_id_len;		wdev->u.mesh.chandef = setup->chandef;		wdev->u.mesh.beacon_interval = setup->beacon_interval;	} 	return err;} int cfg80211_set_mesh_channel(struct cfg80211_registered_device *rdev,			      struct wireless_dev *wdev,			      struct cfg80211_chan_def *chandef){	int err; 	/*	 * Workaround for libertas (only!), it puts the interface	 * into mesh mode but doesn't implement join_mesh. Instead,	 * it is configured via sysfs and then joins the mesh when	 * you set the channel. Note that the libertas mesh isn't	 * compatible with 802.11 mesh.	 */	if (rdev->ops->libertas_set_mesh_channel) {		if (chandef->width != NL80211_CHAN_WIDTH_20_NOHT)			return -EINVAL; 		if (!netif_running(wdev->netdev))			return -ENETDOWN; 		err = rdev_libertas_set_mesh_channel(rdev, wdev->netdev,						     chandef->chan);		if (!err)			wdev->u.mesh.chandef = *chandef; 		return err;	} 	if (wdev->u.mesh.id_len)		return -EBUSY; 	wdev->u.mesh.preset_chandef = *chandef;	return 0;} int cfg80211_leave_mesh(struct cfg80211_registered_device *rdev,			struct net_device *dev){	struct wireless_dev *wdev = dev->ieee80211_ptr;	int err; 	lockdep_assert_wiphy(wdev->wiphy); 	if (dev->ieee80211_ptr->iftype != NL80211_IFTYPE_MESH_POINT)		return -EOPNOTSUPP; 	if (!rdev->ops->leave_mesh)		return -EOPNOTSUPP; 	if (!wdev->u.mesh.id_len)		return -ENOTCONN; 	err = rdev_leave_mesh(rdev, dev);	if (!err) {		wdev->conn_owner_nlportid = 0;		wdev->u.mesh.id_len = 0;		wdev->u.mesh.beacon_interval = 0;		memset(&wdev->u.mesh.chandef, 0,		       sizeof(wdev->u.mesh.chandef));		rdev_set_qos_map(rdev, dev, NULL);		cfg80211_sched_dfs_chan_update(rdev);	} 	return err;}