1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * Portions 4 * Copyright (C) 2022 Intel Corporation 5 */ 6 #include <linux/ieee80211.h> 7 #include <linux/export.h> 8 #include <net/cfg80211.h> 9 #include "nl80211.h" 10 #include "core.h" 11 #include "rdev-ops.h" 12 13 /* Default values, timeouts in ms */ 14 #define MESH_TTL 31 15 #define MESH_DEFAULT_ELEMENT_TTL 31 16 #define MESH_MAX_RETR 3 17 #define MESH_RET_T 100 18 #define MESH_CONF_T 100 19 #define MESH_HOLD_T 100 20 21 #define MESH_PATH_TIMEOUT 5000 22 #define MESH_RANN_INTERVAL 5000 23 #define MESH_PATH_TO_ROOT_TIMEOUT 6000 24 #define MESH_ROOT_INTERVAL 5000 25 #define MESH_ROOT_CONFIRMATION_INTERVAL 2000 26 #define MESH_DEFAULT_PLINK_TIMEOUT 1800 /* timeout in seconds */ 27 28 /* 29 * Minimum interval between two consecutive PREQs originated by the same 30 * interface 31 */ 32 #define MESH_PREQ_MIN_INT 10 33 #define MESH_PERR_MIN_INT 100 34 #define MESH_DIAM_TRAVERSAL_TIME 50 35 36 #define MESH_RSSI_THRESHOLD 0 37 38 /* 39 * A path will be refreshed if it is used PATH_REFRESH_TIME milliseconds 40 * before timing out. This way it will remain ACTIVE and no data frames 41 * will be unnecessarily held in the pending queue. 42 */ 43 #define MESH_PATH_REFRESH_TIME 1000 44 #define MESH_MIN_DISCOVERY_TIMEOUT (2 * MESH_DIAM_TRAVERSAL_TIME) 45 46 /* Default maximum number of established plinks per interface */ 47 #define MESH_MAX_ESTAB_PLINKS 32 48 49 #define MESH_MAX_PREQ_RETRIES 4 50 51 #define MESH_SYNC_NEIGHBOR_OFFSET_MAX 50 52 53 #define MESH_DEFAULT_BEACON_INTERVAL 1000 /* in 1024 us units (=TUs) */ 54 #define MESH_DEFAULT_DTIM_PERIOD 2 55 #define MESH_DEFAULT_AWAKE_WINDOW 10 /* in 1024 us units (=TUs) */ 56 57 const struct mesh_config default_mesh_config = { 58 .dot11MeshRetryTimeout = MESH_RET_T, 59 .dot11MeshConfirmTimeout = MESH_CONF_T, 60 .dot11MeshHoldingTimeout = MESH_HOLD_T, 61 .dot11MeshMaxRetries = MESH_MAX_RETR, 62 .dot11MeshTTL = MESH_TTL, 63 .element_ttl = MESH_DEFAULT_ELEMENT_TTL, 64 .auto_open_plinks = true, 65 .dot11MeshMaxPeerLinks = MESH_MAX_ESTAB_PLINKS, 66 .dot11MeshNbrOffsetMaxNeighbor = MESH_SYNC_NEIGHBOR_OFFSET_MAX, 67 .dot11MeshHWMPactivePathTimeout = MESH_PATH_TIMEOUT, 68 .dot11MeshHWMPpreqMinInterval = MESH_PREQ_MIN_INT, 69 .dot11MeshHWMPperrMinInterval = MESH_PERR_MIN_INT, 70 .dot11MeshHWMPnetDiameterTraversalTime = MESH_DIAM_TRAVERSAL_TIME, 71 .dot11MeshHWMPmaxPREQretries = MESH_MAX_PREQ_RETRIES, 72 .path_refresh_time = MESH_PATH_REFRESH_TIME, 73 .min_discovery_timeout = MESH_MIN_DISCOVERY_TIMEOUT, 74 .dot11MeshHWMPRannInterval = MESH_RANN_INTERVAL, 75 .dot11MeshGateAnnouncementProtocol = false, 76 .dot11MeshForwarding = true, 77 .rssi_threshold = MESH_RSSI_THRESHOLD, 78 .ht_opmode = IEEE80211_HT_OP_MODE_PROTECTION_NONHT_MIXED, 79 .dot11MeshHWMPactivePathToRootTimeout = MESH_PATH_TO_ROOT_TIMEOUT, 80 .dot11MeshHWMProotInterval = MESH_ROOT_INTERVAL, 81 .dot11MeshHWMPconfirmationInterval = MESH_ROOT_CONFIRMATION_INTERVAL, 82 .power_mode = NL80211_MESH_POWER_ACTIVE, 83 .dot11MeshAwakeWindowDuration = MESH_DEFAULT_AWAKE_WINDOW, 84 .plink_timeout = MESH_DEFAULT_PLINK_TIMEOUT, 85 .dot11MeshNolearn = false, 86 }; 87 88 const struct mesh_setup default_mesh_setup = { 89 /* cfg80211_join_mesh() will pick a channel if needed */ 90 .sync_method = IEEE80211_SYNC_METHOD_NEIGHBOR_OFFSET, 91 .path_sel_proto = IEEE80211_PATH_PROTOCOL_HWMP, 92 .path_metric = IEEE80211_PATH_METRIC_AIRTIME, 93 .auth_id = 0, /* open */ 94 .ie = NULL, 95 .ie_len = 0, 96 .is_secure = false, 97 .user_mpm = false, 98 .beacon_interval = MESH_DEFAULT_BEACON_INTERVAL, 99 .dtim_period = MESH_DEFAULT_DTIM_PERIOD, 100 }; 101 102 int __cfg80211_join_mesh(struct cfg80211_registered_device *rdev, 103 struct net_device *dev, 104 struct mesh_setup *setup, 105 const struct mesh_config *conf) 106 { 107 struct wireless_dev *wdev = dev->ieee80211_ptr; 108 int err; 109 110 BUILD_BUG_ON(IEEE80211_MAX_SSID_LEN != IEEE80211_MAX_MESH_ID_LEN); 111 112 ASSERT_WDEV_LOCK(wdev); 113 114 if (dev->ieee80211_ptr->iftype != NL80211_IFTYPE_MESH_POINT) 115 return -EOPNOTSUPP; 116 117 if (!(rdev->wiphy.flags & WIPHY_FLAG_MESH_AUTH) && 118 setup->is_secure) 119 return -EOPNOTSUPP; 120 121 if (wdev->u.mesh.id_len) 122 return -EALREADY; 123 124 if (!setup->mesh_id_len) 125 return -EINVAL; 126 127 if (!rdev->ops->join_mesh) 128 return -EOPNOTSUPP; 129 130 if (!setup->chandef.chan) { 131 /* if no channel explicitly given, use preset channel */ 132 setup->chandef = wdev->u.mesh.preset_chandef; 133 } 134 135 if (!setup->chandef.chan) { 136 /* if we don't have that either, use the first usable channel */ 137 enum nl80211_band band; 138 139 for (band = 0; band < NUM_NL80211_BANDS; band++) { 140 struct ieee80211_supported_band *sband; 141 struct ieee80211_channel *chan; 142 int i; 143 144 sband = rdev->wiphy.bands[band]; 145 if (!sband) 146 continue; 147 148 for (i = 0; i < sband->n_channels; i++) { 149 chan = &sband->channels[i]; 150 if (chan->flags & (IEEE80211_CHAN_NO_IR | 151 IEEE80211_CHAN_DISABLED | 152 IEEE80211_CHAN_RADAR)) 153 continue; 154 setup->chandef.chan = chan; 155 break; 156 } 157 158 if (setup->chandef.chan) 159 break; 160 } 161 162 /* no usable channel ... */ 163 if (!setup->chandef.chan) 164 return -EINVAL; 165 166 setup->chandef.width = NL80211_CHAN_WIDTH_20_NOHT; 167 setup->chandef.center_freq1 = setup->chandef.chan->center_freq; 168 } 169 170 /* 171 * check if basic rates are available otherwise use mandatory rates as 172 * basic rates 173 */ 174 if (!setup->basic_rates) { 175 enum nl80211_bss_scan_width scan_width; 176 struct ieee80211_supported_band *sband = 177 rdev->wiphy.bands[setup->chandef.chan->band]; 178 179 if (setup->chandef.chan->band == NL80211_BAND_2GHZ) { 180 int i; 181 182 /* 183 * Older versions selected the mandatory rates for 184 * 2.4 GHz as well, but were broken in that only 185 * 1 Mbps was regarded as a mandatory rate. Keep 186 * using just 1 Mbps as the default basic rate for 187 * mesh to be interoperable with older versions. 188 */ 189 for (i = 0; i < sband->n_bitrates; i++) { 190 if (sband->bitrates[i].bitrate == 10) { 191 setup->basic_rates = BIT(i); 192 break; 193 } 194 } 195 } else { 196 scan_width = cfg80211_chandef_to_scan_width(&setup->chandef); 197 setup->basic_rates = ieee80211_mandatory_rates(sband, 198 scan_width); 199 } 200 } 201 202 err = cfg80211_chandef_dfs_required(&rdev->wiphy, 203 &setup->chandef, 204 NL80211_IFTYPE_MESH_POINT); 205 if (err < 0) 206 return err; 207 if (err > 0 && !setup->userspace_handles_dfs) 208 return -EINVAL; 209 210 if (!cfg80211_reg_can_beacon(&rdev->wiphy, &setup->chandef, 211 NL80211_IFTYPE_MESH_POINT)) 212 return -EINVAL; 213 214 err = rdev_join_mesh(rdev, dev, conf, setup); 215 if (!err) { 216 memcpy(wdev->u.mesh.id, setup->mesh_id, setup->mesh_id_len); 217 wdev->u.mesh.id_len = setup->mesh_id_len; 218 wdev->u.mesh.chandef = setup->chandef; 219 wdev->u.mesh.beacon_interval = setup->beacon_interval; 220 } 221 222 return err; 223 } 224 225 int cfg80211_set_mesh_channel(struct cfg80211_registered_device *rdev, 226 struct wireless_dev *wdev, 227 struct cfg80211_chan_def *chandef) 228 { 229 int err; 230 231 /* 232 * Workaround for libertas (only!), it puts the interface 233 * into mesh mode but doesn't implement join_mesh. Instead, 234 * it is configured via sysfs and then joins the mesh when 235 * you set the channel. Note that the libertas mesh isn't 236 * compatible with 802.11 mesh. 237 */ 238 if (rdev->ops->libertas_set_mesh_channel) { 239 if (chandef->width != NL80211_CHAN_WIDTH_20_NOHT) 240 return -EINVAL; 241 242 if (!netif_running(wdev->netdev)) 243 return -ENETDOWN; 244 245 err = rdev_libertas_set_mesh_channel(rdev, wdev->netdev, 246 chandef->chan); 247 if (!err) 248 wdev->u.mesh.chandef = *chandef; 249 250 return err; 251 } 252 253 if (wdev->u.mesh.id_len) 254 return -EBUSY; 255 256 wdev->u.mesh.preset_chandef = *chandef; 257 return 0; 258 } 259 260 int __cfg80211_leave_mesh(struct cfg80211_registered_device *rdev, 261 struct net_device *dev) 262 { 263 struct wireless_dev *wdev = dev->ieee80211_ptr; 264 int err; 265 266 ASSERT_WDEV_LOCK(wdev); 267 268 if (dev->ieee80211_ptr->iftype != NL80211_IFTYPE_MESH_POINT) 269 return -EOPNOTSUPP; 270 271 if (!rdev->ops->leave_mesh) 272 return -EOPNOTSUPP; 273 274 if (!wdev->u.mesh.id_len) 275 return -ENOTCONN; 276 277 err = rdev_leave_mesh(rdev, dev); 278 if (!err) { 279 wdev->conn_owner_nlportid = 0; 280 wdev->u.mesh.id_len = 0; 281 wdev->u.mesh.beacon_interval = 0; 282 memset(&wdev->u.mesh.chandef, 0, 283 sizeof(wdev->u.mesh.chandef)); 284 rdev_set_qos_map(rdev, dev, NULL); 285 cfg80211_sched_dfs_chan_update(rdev); 286 } 287 288 return err; 289 } 290 291 int cfg80211_leave_mesh(struct cfg80211_registered_device *rdev, 292 struct net_device *dev) 293 { 294 struct wireless_dev *wdev = dev->ieee80211_ptr; 295 int err; 296 297 wdev_lock(wdev); 298 err = __cfg80211_leave_mesh(rdev, dev); 299 wdev_unlock(wdev); 300 301 return err; 302 } 303