1 #include <linux/ieee80211.h> 2 #include <linux/export.h> 3 #include <net/cfg80211.h> 4 #include "nl80211.h" 5 #include "core.h" 6 #include "rdev-ops.h" 7 8 /* Default values, timeouts in ms */ 9 #define MESH_TTL 31 10 #define MESH_DEFAULT_ELEMENT_TTL 31 11 #define MESH_MAX_RETR 3 12 #define MESH_RET_T 100 13 #define MESH_CONF_T 100 14 #define MESH_HOLD_T 100 15 16 #define MESH_PATH_TIMEOUT 5000 17 #define MESH_RANN_INTERVAL 5000 18 #define MESH_PATH_TO_ROOT_TIMEOUT 6000 19 #define MESH_ROOT_INTERVAL 5000 20 #define MESH_ROOT_CONFIRMATION_INTERVAL 2000 21 #define MESH_DEFAULT_PLINK_TIMEOUT 1800 /* timeout in seconds */ 22 23 /* 24 * Minimum interval between two consecutive PREQs originated by the same 25 * interface 26 */ 27 #define MESH_PREQ_MIN_INT 10 28 #define MESH_PERR_MIN_INT 100 29 #define MESH_DIAM_TRAVERSAL_TIME 50 30 31 #define MESH_RSSI_THRESHOLD 0 32 33 /* 34 * A path will be refreshed if it is used PATH_REFRESH_TIME milliseconds 35 * before timing out. This way it will remain ACTIVE and no data frames 36 * will be unnecessarily held in the pending queue. 37 */ 38 #define MESH_PATH_REFRESH_TIME 1000 39 #define MESH_MIN_DISCOVERY_TIMEOUT (2 * MESH_DIAM_TRAVERSAL_TIME) 40 41 /* Default maximum number of established plinks per interface */ 42 #define MESH_MAX_ESTAB_PLINKS 32 43 44 #define MESH_MAX_PREQ_RETRIES 4 45 46 #define MESH_SYNC_NEIGHBOR_OFFSET_MAX 50 47 48 #define MESH_DEFAULT_BEACON_INTERVAL 1000 /* in 1024 us units (=TUs) */ 49 #define MESH_DEFAULT_DTIM_PERIOD 2 50 #define MESH_DEFAULT_AWAKE_WINDOW 10 /* in 1024 us units (=TUs) */ 51 52 const struct mesh_config default_mesh_config = { 53 .dot11MeshRetryTimeout = MESH_RET_T, 54 .dot11MeshConfirmTimeout = MESH_CONF_T, 55 .dot11MeshHoldingTimeout = MESH_HOLD_T, 56 .dot11MeshMaxRetries = MESH_MAX_RETR, 57 .dot11MeshTTL = MESH_TTL, 58 .element_ttl = MESH_DEFAULT_ELEMENT_TTL, 59 .auto_open_plinks = true, 60 .dot11MeshMaxPeerLinks = MESH_MAX_ESTAB_PLINKS, 61 .dot11MeshNbrOffsetMaxNeighbor = MESH_SYNC_NEIGHBOR_OFFSET_MAX, 62 .dot11MeshHWMPactivePathTimeout = MESH_PATH_TIMEOUT, 63 .dot11MeshHWMPpreqMinInterval = MESH_PREQ_MIN_INT, 64 .dot11MeshHWMPperrMinInterval = MESH_PERR_MIN_INT, 65 .dot11MeshHWMPnetDiameterTraversalTime = MESH_DIAM_TRAVERSAL_TIME, 66 .dot11MeshHWMPmaxPREQretries = MESH_MAX_PREQ_RETRIES, 67 .path_refresh_time = MESH_PATH_REFRESH_TIME, 68 .min_discovery_timeout = MESH_MIN_DISCOVERY_TIMEOUT, 69 .dot11MeshHWMPRannInterval = MESH_RANN_INTERVAL, 70 .dot11MeshGateAnnouncementProtocol = false, 71 .dot11MeshForwarding = true, 72 .rssi_threshold = MESH_RSSI_THRESHOLD, 73 .ht_opmode = IEEE80211_HT_OP_MODE_PROTECTION_NONHT_MIXED, 74 .dot11MeshHWMPactivePathToRootTimeout = MESH_PATH_TO_ROOT_TIMEOUT, 75 .dot11MeshHWMProotInterval = MESH_ROOT_INTERVAL, 76 .dot11MeshHWMPconfirmationInterval = MESH_ROOT_CONFIRMATION_INTERVAL, 77 .power_mode = NL80211_MESH_POWER_ACTIVE, 78 .dot11MeshAwakeWindowDuration = MESH_DEFAULT_AWAKE_WINDOW, 79 .plink_timeout = MESH_DEFAULT_PLINK_TIMEOUT, 80 }; 81 82 const struct mesh_setup default_mesh_setup = { 83 /* cfg80211_join_mesh() will pick a channel if needed */ 84 .sync_method = IEEE80211_SYNC_METHOD_NEIGHBOR_OFFSET, 85 .path_sel_proto = IEEE80211_PATH_PROTOCOL_HWMP, 86 .path_metric = IEEE80211_PATH_METRIC_AIRTIME, 87 .auth_id = 0, /* open */ 88 .ie = NULL, 89 .ie_len = 0, 90 .is_secure = false, 91 .user_mpm = false, 92 .beacon_interval = MESH_DEFAULT_BEACON_INTERVAL, 93 .dtim_period = MESH_DEFAULT_DTIM_PERIOD, 94 }; 95 96 int __cfg80211_join_mesh(struct cfg80211_registered_device *rdev, 97 struct net_device *dev, 98 struct mesh_setup *setup, 99 const struct mesh_config *conf) 100 { 101 struct wireless_dev *wdev = dev->ieee80211_ptr; 102 u8 radar_detect_width = 0; 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 ieee80211_band band; 133 134 for (band = 0; band < IEEE80211_NUM_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 scan_width = cfg80211_chandef_to_scan_width(&setup->chandef); 174 setup->basic_rates = ieee80211_mandatory_rates(sband, 175 scan_width); 176 } 177 178 if (!cfg80211_reg_can_beacon(&rdev->wiphy, &setup->chandef)) 179 return -EINVAL; 180 181 err = cfg80211_chandef_dfs_required(wdev->wiphy, &setup->chandef); 182 if (err < 0) 183 return err; 184 if (err) 185 radar_detect_width = BIT(setup->chandef.width); 186 187 err = cfg80211_can_use_iftype_chan(rdev, wdev, wdev->iftype, 188 setup->chandef.chan, 189 CHAN_MODE_SHARED, 190 radar_detect_width); 191 if (err) 192 return err; 193 194 err = rdev_join_mesh(rdev, dev, conf, setup); 195 if (!err) { 196 memcpy(wdev->ssid, setup->mesh_id, setup->mesh_id_len); 197 wdev->mesh_id_len = setup->mesh_id_len; 198 wdev->channel = setup->chandef.chan; 199 } 200 201 return err; 202 } 203 204 int cfg80211_join_mesh(struct cfg80211_registered_device *rdev, 205 struct net_device *dev, 206 struct mesh_setup *setup, 207 const struct mesh_config *conf) 208 { 209 struct wireless_dev *wdev = dev->ieee80211_ptr; 210 int err; 211 212 wdev_lock(wdev); 213 err = __cfg80211_join_mesh(rdev, dev, setup, conf); 214 wdev_unlock(wdev); 215 216 return err; 217 } 218 219 int cfg80211_set_mesh_channel(struct cfg80211_registered_device *rdev, 220 struct wireless_dev *wdev, 221 struct cfg80211_chan_def *chandef) 222 { 223 int err; 224 225 /* 226 * Workaround for libertas (only!), it puts the interface 227 * into mesh mode but doesn't implement join_mesh. Instead, 228 * it is configured via sysfs and then joins the mesh when 229 * you set the channel. Note that the libertas mesh isn't 230 * compatible with 802.11 mesh. 231 */ 232 if (rdev->ops->libertas_set_mesh_channel) { 233 if (chandef->width != NL80211_CHAN_WIDTH_20_NOHT) 234 return -EINVAL; 235 236 if (!netif_running(wdev->netdev)) 237 return -ENETDOWN; 238 239 err = cfg80211_can_use_chan(rdev, wdev, chandef->chan, 240 CHAN_MODE_SHARED); 241 if (err) 242 return err; 243 244 err = rdev_libertas_set_mesh_channel(rdev, wdev->netdev, 245 chandef->chan); 246 if (!err) 247 wdev->channel = chandef->chan; 248 249 return err; 250 } 251 252 if (wdev->mesh_id_len) 253 return -EBUSY; 254 255 wdev->preset_chandef = *chandef; 256 return 0; 257 } 258 259 static int __cfg80211_leave_mesh(struct cfg80211_registered_device *rdev, 260 struct net_device *dev) 261 { 262 struct wireless_dev *wdev = dev->ieee80211_ptr; 263 int err; 264 265 ASSERT_WDEV_LOCK(wdev); 266 267 if (dev->ieee80211_ptr->iftype != NL80211_IFTYPE_MESH_POINT) 268 return -EOPNOTSUPP; 269 270 if (!rdev->ops->leave_mesh) 271 return -EOPNOTSUPP; 272 273 if (!wdev->mesh_id_len) 274 return -ENOTCONN; 275 276 err = rdev_leave_mesh(rdev, dev); 277 if (!err) { 278 wdev->mesh_id_len = 0; 279 wdev->channel = NULL; 280 rdev_set_qos_map(rdev, dev, NULL); 281 } 282 283 return err; 284 } 285 286 int 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 } 298