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 int err; 103 104 BUILD_BUG_ON(IEEE80211_MAX_SSID_LEN != IEEE80211_MAX_MESH_ID_LEN); 105 106 ASSERT_WDEV_LOCK(wdev); 107 108 if (dev->ieee80211_ptr->iftype != NL80211_IFTYPE_MESH_POINT) 109 return -EOPNOTSUPP; 110 111 if (!(rdev->wiphy.flags & WIPHY_FLAG_MESH_AUTH) && 112 setup->is_secure) 113 return -EOPNOTSUPP; 114 115 if (wdev->mesh_id_len) 116 return -EALREADY; 117 118 if (!setup->mesh_id_len) 119 return -EINVAL; 120 121 if (!rdev->ops->join_mesh) 122 return -EOPNOTSUPP; 123 124 if (!setup->chandef.chan) { 125 /* if no channel explicitly given, use preset channel */ 126 setup->chandef = wdev->preset_chandef; 127 } 128 129 if (!setup->chandef.chan) { 130 /* if we don't have that either, use the first usable channel */ 131 enum ieee80211_band band; 132 133 for (band = 0; band < IEEE80211_NUM_BANDS; band++) { 134 struct ieee80211_supported_band *sband; 135 struct ieee80211_channel *chan; 136 int i; 137 138 sband = rdev->wiphy.bands[band]; 139 if (!sband) 140 continue; 141 142 for (i = 0; i < sband->n_channels; i++) { 143 chan = &sband->channels[i]; 144 if (chan->flags & (IEEE80211_CHAN_NO_IBSS | 145 IEEE80211_CHAN_PASSIVE_SCAN | 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_can_use_chan(rdev, wdev, setup->chandef.chan, 182 CHAN_MODE_SHARED); 183 if (err) 184 return err; 185 186 err = rdev_join_mesh(rdev, dev, conf, setup); 187 if (!err) { 188 memcpy(wdev->ssid, setup->mesh_id, setup->mesh_id_len); 189 wdev->mesh_id_len = setup->mesh_id_len; 190 wdev->channel = setup->chandef.chan; 191 } 192 193 return err; 194 } 195 196 int cfg80211_join_mesh(struct cfg80211_registered_device *rdev, 197 struct net_device *dev, 198 struct mesh_setup *setup, 199 const struct mesh_config *conf) 200 { 201 struct wireless_dev *wdev = dev->ieee80211_ptr; 202 int err; 203 204 wdev_lock(wdev); 205 err = __cfg80211_join_mesh(rdev, dev, setup, conf); 206 wdev_unlock(wdev); 207 208 return err; 209 } 210 211 int cfg80211_set_mesh_channel(struct cfg80211_registered_device *rdev, 212 struct wireless_dev *wdev, 213 struct cfg80211_chan_def *chandef) 214 { 215 int err; 216 217 /* 218 * Workaround for libertas (only!), it puts the interface 219 * into mesh mode but doesn't implement join_mesh. Instead, 220 * it is configured via sysfs and then joins the mesh when 221 * you set the channel. Note that the libertas mesh isn't 222 * compatible with 802.11 mesh. 223 */ 224 if (rdev->ops->libertas_set_mesh_channel) { 225 if (chandef->width != NL80211_CHAN_WIDTH_20_NOHT) 226 return -EINVAL; 227 228 if (!netif_running(wdev->netdev)) 229 return -ENETDOWN; 230 231 err = cfg80211_can_use_chan(rdev, wdev, chandef->chan, 232 CHAN_MODE_SHARED); 233 if (err) 234 return err; 235 236 err = rdev_libertas_set_mesh_channel(rdev, wdev->netdev, 237 chandef->chan); 238 if (!err) 239 wdev->channel = chandef->chan; 240 241 return err; 242 } 243 244 if (wdev->mesh_id_len) 245 return -EBUSY; 246 247 wdev->preset_chandef = *chandef; 248 return 0; 249 } 250 251 static int __cfg80211_leave_mesh(struct cfg80211_registered_device *rdev, 252 struct net_device *dev) 253 { 254 struct wireless_dev *wdev = dev->ieee80211_ptr; 255 int err; 256 257 ASSERT_WDEV_LOCK(wdev); 258 259 if (dev->ieee80211_ptr->iftype != NL80211_IFTYPE_MESH_POINT) 260 return -EOPNOTSUPP; 261 262 if (!rdev->ops->leave_mesh) 263 return -EOPNOTSUPP; 264 265 if (!wdev->mesh_id_len) 266 return -ENOTCONN; 267 268 err = rdev_leave_mesh(rdev, dev); 269 if (!err) { 270 wdev->mesh_id_len = 0; 271 wdev->channel = NULL; 272 } 273 274 return err; 275 } 276 277 int cfg80211_leave_mesh(struct cfg80211_registered_device *rdev, 278 struct net_device *dev) 279 { 280 struct wireless_dev *wdev = dev->ieee80211_ptr; 281 int err; 282 283 wdev_lock(wdev); 284 err = __cfg80211_leave_mesh(rdev, dev); 285 wdev_unlock(wdev); 286 287 return err; 288 } 289