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 53 const 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 }; 82 83 const struct mesh_setup default_mesh_setup = { 84 /* cfg80211_join_mesh() will pick a channel if needed */ 85 .sync_method = IEEE80211_SYNC_METHOD_NEIGHBOR_OFFSET, 86 .path_sel_proto = IEEE80211_PATH_PROTOCOL_HWMP, 87 .path_metric = IEEE80211_PATH_METRIC_AIRTIME, 88 .auth_id = 0, /* open */ 89 .ie = NULL, 90 .ie_len = 0, 91 .is_secure = false, 92 .user_mpm = false, 93 .beacon_interval = MESH_DEFAULT_BEACON_INTERVAL, 94 .dtim_period = MESH_DEFAULT_DTIM_PERIOD, 95 }; 96 97 int __cfg80211_join_mesh(struct cfg80211_registered_device *rdev, 98 struct net_device *dev, 99 struct mesh_setup *setup, 100 const struct mesh_config *conf) 101 { 102 struct wireless_dev *wdev = dev->ieee80211_ptr; 103 int err; 104 105 BUILD_BUG_ON(IEEE80211_MAX_SSID_LEN != IEEE80211_MAX_MESH_ID_LEN); 106 107 ASSERT_WDEV_LOCK(wdev); 108 109 if (dev->ieee80211_ptr->iftype != NL80211_IFTYPE_MESH_POINT) 110 return -EOPNOTSUPP; 111 112 if (!(rdev->wiphy.flags & WIPHY_FLAG_MESH_AUTH) && 113 setup->is_secure) 114 return -EOPNOTSUPP; 115 116 if (wdev->mesh_id_len) 117 return -EALREADY; 118 119 if (!setup->mesh_id_len) 120 return -EINVAL; 121 122 if (!rdev->ops->join_mesh) 123 return -EOPNOTSUPP; 124 125 if (!setup->chandef.chan) { 126 /* if no channel explicitly given, use preset channel */ 127 setup->chandef = wdev->preset_chandef; 128 } 129 130 if (!setup->chandef.chan) { 131 /* if we don't have that either, use the first usable channel */ 132 enum nl80211_band band; 133 134 for (band = 0; band < NUM_NL80211_BANDS; band++) { 135 struct ieee80211_supported_band *sband; 136 struct ieee80211_channel *chan; 137 int i; 138 139 sband = rdev->wiphy.bands[band]; 140 if (!sband) 141 continue; 142 143 for (i = 0; i < sband->n_channels; i++) { 144 chan = &sband->channels[i]; 145 if (chan->flags & (IEEE80211_CHAN_NO_IR | 146 IEEE80211_CHAN_DISABLED | 147 IEEE80211_CHAN_RADAR)) 148 continue; 149 setup->chandef.chan = chan; 150 break; 151 } 152 153 if (setup->chandef.chan) 154 break; 155 } 156 157 /* no usable channel ... */ 158 if (!setup->chandef.chan) 159 return -EINVAL; 160 161 setup->chandef.width = NL80211_CHAN_WIDTH_20_NOHT; 162 setup->chandef.center_freq1 = setup->chandef.chan->center_freq; 163 } 164 165 /* 166 * check if basic rates are available otherwise use mandatory rates as 167 * basic rates 168 */ 169 if (!setup->basic_rates) { 170 enum nl80211_bss_scan_width scan_width; 171 struct ieee80211_supported_band *sband = 172 rdev->wiphy.bands[setup->chandef.chan->band]; 173 174 if (setup->chandef.chan->band == NL80211_BAND_2GHZ) { 175 int i; 176 177 /* 178 * Older versions selected the mandatory rates for 179 * 2.4 GHz as well, but were broken in that only 180 * 1 Mbps was regarded as a mandatory rate. Keep 181 * using just 1 Mbps as the default basic rate for 182 * mesh to be interoperable with older versions. 183 */ 184 for (i = 0; i < sband->n_bitrates; i++) { 185 if (sband->bitrates[i].bitrate == 10) { 186 setup->basic_rates = BIT(i); 187 break; 188 } 189 } 190 } else { 191 scan_width = cfg80211_chandef_to_scan_width(&setup->chandef); 192 setup->basic_rates = ieee80211_mandatory_rates(sband, 193 scan_width); 194 } 195 } 196 197 err = cfg80211_chandef_dfs_required(&rdev->wiphy, 198 &setup->chandef, 199 NL80211_IFTYPE_MESH_POINT); 200 if (err < 0) 201 return err; 202 if (err > 0 && !setup->userspace_handles_dfs) 203 return -EINVAL; 204 205 if (!cfg80211_reg_can_beacon(&rdev->wiphy, &setup->chandef, 206 NL80211_IFTYPE_MESH_POINT)) 207 return -EINVAL; 208 209 err = rdev_join_mesh(rdev, dev, conf, setup); 210 if (!err) { 211 memcpy(wdev->ssid, setup->mesh_id, setup->mesh_id_len); 212 wdev->mesh_id_len = setup->mesh_id_len; 213 wdev->chandef = setup->chandef; 214 wdev->beacon_interval = setup->beacon_interval; 215 } 216 217 return err; 218 } 219 220 int cfg80211_set_mesh_channel(struct cfg80211_registered_device *rdev, 221 struct wireless_dev *wdev, 222 struct cfg80211_chan_def *chandef) 223 { 224 int err; 225 226 /* 227 * Workaround for libertas (only!), it puts the interface 228 * into mesh mode but doesn't implement join_mesh. Instead, 229 * it is configured via sysfs and then joins the mesh when 230 * you set the channel. Note that the libertas mesh isn't 231 * compatible with 802.11 mesh. 232 */ 233 if (rdev->ops->libertas_set_mesh_channel) { 234 if (chandef->width != NL80211_CHAN_WIDTH_20_NOHT) 235 return -EINVAL; 236 237 if (!netif_running(wdev->netdev)) 238 return -ENETDOWN; 239 240 err = rdev_libertas_set_mesh_channel(rdev, wdev->netdev, 241 chandef->chan); 242 if (!err) 243 wdev->chandef = *chandef; 244 245 return err; 246 } 247 248 if (wdev->mesh_id_len) 249 return -EBUSY; 250 251 wdev->preset_chandef = *chandef; 252 return 0; 253 } 254 255 int __cfg80211_leave_mesh(struct cfg80211_registered_device *rdev, 256 struct net_device *dev) 257 { 258 struct wireless_dev *wdev = dev->ieee80211_ptr; 259 int err; 260 261 ASSERT_WDEV_LOCK(wdev); 262 263 if (dev->ieee80211_ptr->iftype != NL80211_IFTYPE_MESH_POINT) 264 return -EOPNOTSUPP; 265 266 if (!rdev->ops->leave_mesh) 267 return -EOPNOTSUPP; 268 269 if (!wdev->mesh_id_len) 270 return -ENOTCONN; 271 272 err = rdev_leave_mesh(rdev, dev); 273 if (!err) { 274 wdev->conn_owner_nlportid = 0; 275 wdev->mesh_id_len = 0; 276 wdev->beacon_interval = 0; 277 memset(&wdev->chandef, 0, sizeof(wdev->chandef)); 278 rdev_set_qos_map(rdev, dev, NULL); 279 cfg80211_sched_dfs_chan_update(rdev); 280 } 281 282 return err; 283 } 284 285 int cfg80211_leave_mesh(struct cfg80211_registered_device *rdev, 286 struct net_device *dev) 287 { 288 struct wireless_dev *wdev = dev->ieee80211_ptr; 289 int err; 290 291 wdev_lock(wdev); 292 err = __cfg80211_leave_mesh(rdev, dev); 293 wdev_unlock(wdev); 294 295 return err; 296 } 297