cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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mesh.c (8225B)


      1// SPDX-License-Identifier: GPL-2.0
      2#include <linux/ieee80211.h>
      3#include <linux/export.h>
      4#include <net/cfg80211.h>
      5#include "nl80211.h"
      6#include "core.h"
      7#include "rdev-ops.h"
      8
      9/* Default values, timeouts in ms */
     10#define MESH_TTL 		31
     11#define MESH_DEFAULT_ELEMENT_TTL 31
     12#define MESH_MAX_RETR	 	3
     13#define MESH_RET_T 		100
     14#define MESH_CONF_T 		100
     15#define MESH_HOLD_T 		100
     16
     17#define MESH_PATH_TIMEOUT	5000
     18#define MESH_RANN_INTERVAL      5000
     19#define MESH_PATH_TO_ROOT_TIMEOUT      6000
     20#define MESH_ROOT_INTERVAL     5000
     21#define MESH_ROOT_CONFIRMATION_INTERVAL 2000
     22#define MESH_DEFAULT_PLINK_TIMEOUT	1800 /* timeout in seconds */
     23
     24/*
     25 * Minimum interval between two consecutive PREQs originated by the same
     26 * interface
     27 */
     28#define MESH_PREQ_MIN_INT	10
     29#define MESH_PERR_MIN_INT	100
     30#define MESH_DIAM_TRAVERSAL_TIME 50
     31
     32#define MESH_RSSI_THRESHOLD	0
     33
     34/*
     35 * A path will be refreshed if it is used PATH_REFRESH_TIME milliseconds
     36 * before timing out.  This way it will remain ACTIVE and no data frames
     37 * will be unnecessarily held in the pending queue.
     38 */
     39#define MESH_PATH_REFRESH_TIME			1000
     40#define MESH_MIN_DISCOVERY_TIMEOUT (2 * MESH_DIAM_TRAVERSAL_TIME)
     41
     42/* Default maximum number of established plinks per interface */
     43#define MESH_MAX_ESTAB_PLINKS	32
     44
     45#define MESH_MAX_PREQ_RETRIES	4
     46
     47#define MESH_SYNC_NEIGHBOR_OFFSET_MAX 50
     48
     49#define MESH_DEFAULT_BEACON_INTERVAL	1000	/* in 1024 us units (=TUs) */
     50#define MESH_DEFAULT_DTIM_PERIOD	2
     51#define MESH_DEFAULT_AWAKE_WINDOW	10	/* in 1024 us units (=TUs) */
     52
     53const struct mesh_config default_mesh_config = {
     54	.dot11MeshRetryTimeout = MESH_RET_T,
     55	.dot11MeshConfirmTimeout = MESH_CONF_T,
     56	.dot11MeshHoldingTimeout = MESH_HOLD_T,
     57	.dot11MeshMaxRetries = MESH_MAX_RETR,
     58	.dot11MeshTTL = MESH_TTL,
     59	.element_ttl = MESH_DEFAULT_ELEMENT_TTL,
     60	.auto_open_plinks = true,
     61	.dot11MeshMaxPeerLinks = MESH_MAX_ESTAB_PLINKS,
     62	.dot11MeshNbrOffsetMaxNeighbor = MESH_SYNC_NEIGHBOR_OFFSET_MAX,
     63	.dot11MeshHWMPactivePathTimeout = MESH_PATH_TIMEOUT,
     64	.dot11MeshHWMPpreqMinInterval = MESH_PREQ_MIN_INT,
     65	.dot11MeshHWMPperrMinInterval = MESH_PERR_MIN_INT,
     66	.dot11MeshHWMPnetDiameterTraversalTime = MESH_DIAM_TRAVERSAL_TIME,
     67	.dot11MeshHWMPmaxPREQretries = MESH_MAX_PREQ_RETRIES,
     68	.path_refresh_time = MESH_PATH_REFRESH_TIME,
     69	.min_discovery_timeout = MESH_MIN_DISCOVERY_TIMEOUT,
     70	.dot11MeshHWMPRannInterval = MESH_RANN_INTERVAL,
     71	.dot11MeshGateAnnouncementProtocol = false,
     72	.dot11MeshForwarding = true,
     73	.rssi_threshold = MESH_RSSI_THRESHOLD,
     74	.ht_opmode = IEEE80211_HT_OP_MODE_PROTECTION_NONHT_MIXED,
     75	.dot11MeshHWMPactivePathToRootTimeout = MESH_PATH_TO_ROOT_TIMEOUT,
     76	.dot11MeshHWMProotInterval = MESH_ROOT_INTERVAL,
     77	.dot11MeshHWMPconfirmationInterval = MESH_ROOT_CONFIRMATION_INTERVAL,
     78	.power_mode = NL80211_MESH_POWER_ACTIVE,
     79	.dot11MeshAwakeWindowDuration = MESH_DEFAULT_AWAKE_WINDOW,
     80	.plink_timeout = MESH_DEFAULT_PLINK_TIMEOUT,
     81	.dot11MeshNolearn = false,
     82};
     83
     84const struct mesh_setup default_mesh_setup = {
     85	/* cfg80211_join_mesh() will pick a channel if needed */
     86	.sync_method = IEEE80211_SYNC_METHOD_NEIGHBOR_OFFSET,
     87	.path_sel_proto = IEEE80211_PATH_PROTOCOL_HWMP,
     88	.path_metric = IEEE80211_PATH_METRIC_AIRTIME,
     89	.auth_id = 0, /* open */
     90	.ie = NULL,
     91	.ie_len = 0,
     92	.is_secure = false,
     93	.user_mpm = false,
     94	.beacon_interval = MESH_DEFAULT_BEACON_INTERVAL,
     95	.dtim_period = MESH_DEFAULT_DTIM_PERIOD,
     96};
     97
     98int __cfg80211_join_mesh(struct cfg80211_registered_device *rdev,
     99			 struct net_device *dev,
    100			 struct mesh_setup *setup,
    101			 const struct mesh_config *conf)
    102{
    103	struct wireless_dev *wdev = dev->ieee80211_ptr;
    104	int err;
    105
    106	BUILD_BUG_ON(IEEE80211_MAX_SSID_LEN != IEEE80211_MAX_MESH_ID_LEN);
    107
    108	ASSERT_WDEV_LOCK(wdev);
    109
    110	if (dev->ieee80211_ptr->iftype != NL80211_IFTYPE_MESH_POINT)
    111		return -EOPNOTSUPP;
    112
    113	if (!(rdev->wiphy.flags & WIPHY_FLAG_MESH_AUTH) &&
    114	      setup->is_secure)
    115		return -EOPNOTSUPP;
    116
    117	if (wdev->mesh_id_len)
    118		return -EALREADY;
    119
    120	if (!setup->mesh_id_len)
    121		return -EINVAL;
    122
    123	if (!rdev->ops->join_mesh)
    124		return -EOPNOTSUPP;
    125
    126	if (!setup->chandef.chan) {
    127		/* if no channel explicitly given, use preset channel */
    128		setup->chandef = wdev->preset_chandef;
    129	}
    130
    131	if (!setup->chandef.chan) {
    132		/* if we don't have that either, use the first usable channel */
    133		enum nl80211_band band;
    134
    135		for (band = 0; band < NUM_NL80211_BANDS; band++) {
    136			struct ieee80211_supported_band *sband;
    137			struct ieee80211_channel *chan;
    138			int i;
    139
    140			sband = rdev->wiphy.bands[band];
    141			if (!sband)
    142				continue;
    143
    144			for (i = 0; i < sband->n_channels; i++) {
    145				chan = &sband->channels[i];
    146				if (chan->flags & (IEEE80211_CHAN_NO_IR |
    147						   IEEE80211_CHAN_DISABLED |
    148						   IEEE80211_CHAN_RADAR))
    149					continue;
    150				setup->chandef.chan = chan;
    151				break;
    152			}
    153
    154			if (setup->chandef.chan)
    155				break;
    156		}
    157
    158		/* no usable channel ... */
    159		if (!setup->chandef.chan)
    160			return -EINVAL;
    161
    162		setup->chandef.width = NL80211_CHAN_WIDTH_20_NOHT;
    163		setup->chandef.center_freq1 = setup->chandef.chan->center_freq;
    164	}
    165
    166	/*
    167	 * check if basic rates are available otherwise use mandatory rates as
    168	 * basic rates
    169	 */
    170	if (!setup->basic_rates) {
    171		enum nl80211_bss_scan_width scan_width;
    172		struct ieee80211_supported_band *sband =
    173				rdev->wiphy.bands[setup->chandef.chan->band];
    174
    175		if (setup->chandef.chan->band == NL80211_BAND_2GHZ) {
    176			int i;
    177
    178			/*
    179			 * Older versions selected the mandatory rates for
    180			 * 2.4 GHz as well, but were broken in that only
    181			 * 1 Mbps was regarded as a mandatory rate. Keep
    182			 * using just 1 Mbps as the default basic rate for
    183			 * mesh to be interoperable with older versions.
    184			 */
    185			for (i = 0; i < sband->n_bitrates; i++) {
    186				if (sband->bitrates[i].bitrate == 10) {
    187					setup->basic_rates = BIT(i);
    188					break;
    189				}
    190			}
    191		} else {
    192			scan_width = cfg80211_chandef_to_scan_width(&setup->chandef);
    193			setup->basic_rates = ieee80211_mandatory_rates(sband,
    194								       scan_width);
    195		}
    196	}
    197
    198	err = cfg80211_chandef_dfs_required(&rdev->wiphy,
    199					    &setup->chandef,
    200					    NL80211_IFTYPE_MESH_POINT);
    201	if (err < 0)
    202		return err;
    203	if (err > 0 && !setup->userspace_handles_dfs)
    204		return -EINVAL;
    205
    206	if (!cfg80211_reg_can_beacon(&rdev->wiphy, &setup->chandef,
    207				     NL80211_IFTYPE_MESH_POINT))
    208		return -EINVAL;
    209
    210	err = rdev_join_mesh(rdev, dev, conf, setup);
    211	if (!err) {
    212		memcpy(wdev->ssid, setup->mesh_id, setup->mesh_id_len);
    213		wdev->mesh_id_len = setup->mesh_id_len;
    214		wdev->chandef = setup->chandef;
    215		wdev->beacon_interval = setup->beacon_interval;
    216	}
    217
    218	return err;
    219}
    220
    221int cfg80211_set_mesh_channel(struct cfg80211_registered_device *rdev,
    222			      struct wireless_dev *wdev,
    223			      struct cfg80211_chan_def *chandef)
    224{
    225	int err;
    226
    227	/*
    228	 * Workaround for libertas (only!), it puts the interface
    229	 * into mesh mode but doesn't implement join_mesh. Instead,
    230	 * it is configured via sysfs and then joins the mesh when
    231	 * you set the channel. Note that the libertas mesh isn't
    232	 * compatible with 802.11 mesh.
    233	 */
    234	if (rdev->ops->libertas_set_mesh_channel) {
    235		if (chandef->width != NL80211_CHAN_WIDTH_20_NOHT)
    236			return -EINVAL;
    237
    238		if (!netif_running(wdev->netdev))
    239			return -ENETDOWN;
    240
    241		err = rdev_libertas_set_mesh_channel(rdev, wdev->netdev,
    242						     chandef->chan);
    243		if (!err)
    244			wdev->chandef = *chandef;
    245
    246		return err;
    247	}
    248
    249	if (wdev->mesh_id_len)
    250		return -EBUSY;
    251
    252	wdev->preset_chandef = *chandef;
    253	return 0;
    254}
    255
    256int __cfg80211_leave_mesh(struct cfg80211_registered_device *rdev,
    257			  struct net_device *dev)
    258{
    259	struct wireless_dev *wdev = dev->ieee80211_ptr;
    260	int err;
    261
    262	ASSERT_WDEV_LOCK(wdev);
    263
    264	if (dev->ieee80211_ptr->iftype != NL80211_IFTYPE_MESH_POINT)
    265		return -EOPNOTSUPP;
    266
    267	if (!rdev->ops->leave_mesh)
    268		return -EOPNOTSUPP;
    269
    270	if (!wdev->mesh_id_len)
    271		return -ENOTCONN;
    272
    273	err = rdev_leave_mesh(rdev, dev);
    274	if (!err) {
    275		wdev->conn_owner_nlportid = 0;
    276		wdev->mesh_id_len = 0;
    277		wdev->beacon_interval = 0;
    278		memset(&wdev->chandef, 0, sizeof(wdev->chandef));
    279		rdev_set_qos_map(rdev, dev, NULL);
    280		cfg80211_sched_dfs_chan_update(rdev);
    281	}
    282
    283	return err;
    284}
    285
    286int cfg80211_leave_mesh(struct cfg80211_registered_device *rdev,
    287			struct net_device *dev)
    288{
    289	struct wireless_dev *wdev = dev->ieee80211_ptr;
    290	int err;
    291
    292	wdev_lock(wdev);
    293	err = __cfg80211_leave_mesh(rdev, dev);
    294	wdev_unlock(wdev);
    295
    296	return err;
    297}