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 22 /* 23 * Minimum interval between two consecutive PREQs originated by the same 24 * interface 25 */ 26 #define MESH_PREQ_MIN_INT 10 27 #define MESH_PERR_MIN_INT 100 28 #define MESH_DIAM_TRAVERSAL_TIME 50 29 30 #define MESH_RSSI_THRESHOLD 0 31 32 /* 33 * A path will be refreshed if it is used PATH_REFRESH_TIME milliseconds 34 * before timing out. This way it will remain ACTIVE and no data frames 35 * will be unnecessarily held in the pending queue. 36 */ 37 #define MESH_PATH_REFRESH_TIME 1000 38 #define MESH_MIN_DISCOVERY_TIMEOUT (2 * MESH_DIAM_TRAVERSAL_TIME) 39 40 /* Default maximum number of established plinks per interface */ 41 #define MESH_MAX_ESTAB_PLINKS 32 42 43 #define MESH_MAX_PREQ_RETRIES 4 44 45 #define MESH_SYNC_NEIGHBOR_OFFSET_MAX 50 46 47 #define MESH_DEFAULT_BEACON_INTERVAL 1000 /* in 1024 us units (=TUs) */ 48 #define MESH_DEFAULT_DTIM_PERIOD 2 49 #define MESH_DEFAULT_AWAKE_WINDOW 10 /* in 1024 us units (=TUs) */ 50 51 const struct mesh_config default_mesh_config = { 52 .dot11MeshRetryTimeout = MESH_RET_T, 53 .dot11MeshConfirmTimeout = MESH_CONF_T, 54 .dot11MeshHoldingTimeout = MESH_HOLD_T, 55 .dot11MeshMaxRetries = MESH_MAX_RETR, 56 .dot11MeshTTL = MESH_TTL, 57 .element_ttl = MESH_DEFAULT_ELEMENT_TTL, 58 .auto_open_plinks = true, 59 .dot11MeshMaxPeerLinks = MESH_MAX_ESTAB_PLINKS, 60 .dot11MeshNbrOffsetMaxNeighbor = MESH_SYNC_NEIGHBOR_OFFSET_MAX, 61 .dot11MeshHWMPactivePathTimeout = MESH_PATH_TIMEOUT, 62 .dot11MeshHWMPpreqMinInterval = MESH_PREQ_MIN_INT, 63 .dot11MeshHWMPperrMinInterval = MESH_PERR_MIN_INT, 64 .dot11MeshHWMPnetDiameterTraversalTime = MESH_DIAM_TRAVERSAL_TIME, 65 .dot11MeshHWMPmaxPREQretries = MESH_MAX_PREQ_RETRIES, 66 .path_refresh_time = MESH_PATH_REFRESH_TIME, 67 .min_discovery_timeout = MESH_MIN_DISCOVERY_TIMEOUT, 68 .dot11MeshHWMPRannInterval = MESH_RANN_INTERVAL, 69 .dot11MeshGateAnnouncementProtocol = false, 70 .dot11MeshForwarding = true, 71 .rssi_threshold = MESH_RSSI_THRESHOLD, 72 .ht_opmode = IEEE80211_HT_OP_MODE_PROTECTION_NONHT_MIXED, 73 .dot11MeshHWMPactivePathToRootTimeout = MESH_PATH_TO_ROOT_TIMEOUT, 74 .dot11MeshHWMProotInterval = MESH_ROOT_INTERVAL, 75 .dot11MeshHWMPconfirmationInterval = MESH_ROOT_CONFIRMATION_INTERVAL, 76 .power_mode = NL80211_MESH_POWER_ACTIVE, 77 .dot11MeshAwakeWindowDuration = MESH_DEFAULT_AWAKE_WINDOW, 78 }; 79 80 const struct mesh_setup default_mesh_setup = { 81 /* cfg80211_join_mesh() will pick a channel if needed */ 82 .sync_method = IEEE80211_SYNC_METHOD_NEIGHBOR_OFFSET, 83 .path_sel_proto = IEEE80211_PATH_PROTOCOL_HWMP, 84 .path_metric = IEEE80211_PATH_METRIC_AIRTIME, 85 .ie = NULL, 86 .ie_len = 0, 87 .is_secure = false, 88 .user_mpm = false, 89 .beacon_interval = MESH_DEFAULT_BEACON_INTERVAL, 90 .dtim_period = MESH_DEFAULT_DTIM_PERIOD, 91 }; 92 93 int __cfg80211_join_mesh(struct cfg80211_registered_device *rdev, 94 struct net_device *dev, 95 struct mesh_setup *setup, 96 const struct mesh_config *conf) 97 { 98 struct wireless_dev *wdev = dev->ieee80211_ptr; 99 int err; 100 101 BUILD_BUG_ON(IEEE80211_MAX_SSID_LEN != IEEE80211_MAX_MESH_ID_LEN); 102 103 ASSERT_WDEV_LOCK(wdev); 104 105 if (dev->ieee80211_ptr->iftype != NL80211_IFTYPE_MESH_POINT) 106 return -EOPNOTSUPP; 107 108 if (!(rdev->wiphy.flags & WIPHY_FLAG_MESH_AUTH) && 109 setup->is_secure) 110 return -EOPNOTSUPP; 111 112 if (wdev->mesh_id_len) 113 return -EALREADY; 114 115 if (!setup->mesh_id_len) 116 return -EINVAL; 117 118 if (!rdev->ops->join_mesh) 119 return -EOPNOTSUPP; 120 121 if (!setup->chandef.chan) { 122 /* if no channel explicitly given, use preset channel */ 123 setup->chandef = wdev->preset_chandef; 124 } 125 126 if (!setup->chandef.chan) { 127 /* if we don't have that either, use the first usable channel */ 128 enum ieee80211_band band; 129 130 for (band = 0; band < IEEE80211_NUM_BANDS; band++) { 131 struct ieee80211_supported_band *sband; 132 struct ieee80211_channel *chan; 133 int i; 134 135 sband = rdev->wiphy.bands[band]; 136 if (!sband) 137 continue; 138 139 for (i = 0; i < sband->n_channels; i++) { 140 chan = &sband->channels[i]; 141 if (chan->flags & (IEEE80211_CHAN_NO_IBSS | 142 IEEE80211_CHAN_PASSIVE_SCAN | 143 IEEE80211_CHAN_DISABLED | 144 IEEE80211_CHAN_RADAR)) 145 continue; 146 setup->chandef.chan = chan; 147 break; 148 } 149 150 if (setup->chandef.chan) 151 break; 152 } 153 154 /* no usable channel ... */ 155 if (!setup->chandef.chan) 156 return -EINVAL; 157 158 setup->chandef.width = NL80211_CHAN_WIDTH_20_NOHT; 159 setup->chandef.center_freq1 = setup->chandef.chan->center_freq; 160 } 161 162 if (!cfg80211_reg_can_beacon(&rdev->wiphy, &setup->chandef)) 163 return -EINVAL; 164 165 err = cfg80211_can_use_chan(rdev, wdev, setup->chandef.chan, 166 CHAN_MODE_SHARED); 167 if (err) 168 return err; 169 170 err = rdev_join_mesh(rdev, dev, conf, setup); 171 if (!err) { 172 memcpy(wdev->ssid, setup->mesh_id, setup->mesh_id_len); 173 wdev->mesh_id_len = setup->mesh_id_len; 174 wdev->channel = setup->chandef.chan; 175 } 176 177 return err; 178 } 179 180 int cfg80211_join_mesh(struct cfg80211_registered_device *rdev, 181 struct net_device *dev, 182 struct mesh_setup *setup, 183 const struct mesh_config *conf) 184 { 185 struct wireless_dev *wdev = dev->ieee80211_ptr; 186 int err; 187 188 mutex_lock(&rdev->devlist_mtx); 189 wdev_lock(wdev); 190 err = __cfg80211_join_mesh(rdev, dev, setup, conf); 191 wdev_unlock(wdev); 192 mutex_unlock(&rdev->devlist_mtx); 193 194 return err; 195 } 196 197 int cfg80211_set_mesh_channel(struct cfg80211_registered_device *rdev, 198 struct wireless_dev *wdev, 199 struct cfg80211_chan_def *chandef) 200 { 201 int err; 202 203 /* 204 * Workaround for libertas (only!), it puts the interface 205 * into mesh mode but doesn't implement join_mesh. Instead, 206 * it is configured via sysfs and then joins the mesh when 207 * you set the channel. Note that the libertas mesh isn't 208 * compatible with 802.11 mesh. 209 */ 210 if (rdev->ops->libertas_set_mesh_channel) { 211 if (chandef->width != NL80211_CHAN_WIDTH_20_NOHT) 212 return -EINVAL; 213 214 if (!netif_running(wdev->netdev)) 215 return -ENETDOWN; 216 217 err = cfg80211_can_use_chan(rdev, wdev, chandef->chan, 218 CHAN_MODE_SHARED); 219 if (err) 220 return err; 221 222 err = rdev_libertas_set_mesh_channel(rdev, wdev->netdev, 223 chandef->chan); 224 if (!err) 225 wdev->channel = chandef->chan; 226 227 return err; 228 } 229 230 if (wdev->mesh_id_len) 231 return -EBUSY; 232 233 wdev->preset_chandef = *chandef; 234 return 0; 235 } 236 237 static int __cfg80211_leave_mesh(struct cfg80211_registered_device *rdev, 238 struct net_device *dev) 239 { 240 struct wireless_dev *wdev = dev->ieee80211_ptr; 241 int err; 242 243 ASSERT_WDEV_LOCK(wdev); 244 245 if (dev->ieee80211_ptr->iftype != NL80211_IFTYPE_MESH_POINT) 246 return -EOPNOTSUPP; 247 248 if (!rdev->ops->leave_mesh) 249 return -EOPNOTSUPP; 250 251 if (!wdev->mesh_id_len) 252 return -ENOTCONN; 253 254 err = rdev_leave_mesh(rdev, dev); 255 if (!err) { 256 wdev->mesh_id_len = 0; 257 wdev->channel = NULL; 258 } 259 260 return err; 261 } 262 263 int cfg80211_leave_mesh(struct cfg80211_registered_device *rdev, 264 struct net_device *dev) 265 { 266 struct wireless_dev *wdev = dev->ieee80211_ptr; 267 int err; 268 269 wdev_lock(wdev); 270 err = __cfg80211_leave_mesh(rdev, dev); 271 wdev_unlock(wdev); 272 273 return err; 274 } 275