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 .beacon_interval = MESH_DEFAULT_BEACON_INTERVAL, 89 .dtim_period = MESH_DEFAULT_DTIM_PERIOD, 90 }; 91 92 int __cfg80211_join_mesh(struct cfg80211_registered_device *rdev, 93 struct net_device *dev, 94 struct mesh_setup *setup, 95 const struct mesh_config *conf) 96 { 97 struct wireless_dev *wdev = dev->ieee80211_ptr; 98 int err; 99 100 BUILD_BUG_ON(IEEE80211_MAX_SSID_LEN != IEEE80211_MAX_MESH_ID_LEN); 101 102 ASSERT_WDEV_LOCK(wdev); 103 104 if (dev->ieee80211_ptr->iftype != NL80211_IFTYPE_MESH_POINT) 105 return -EOPNOTSUPP; 106 107 if (!(rdev->wiphy.flags & WIPHY_FLAG_MESH_AUTH) && 108 setup->is_secure) 109 return -EOPNOTSUPP; 110 111 if (wdev->mesh_id_len) 112 return -EALREADY; 113 114 if (!setup->mesh_id_len) 115 return -EINVAL; 116 117 if (!rdev->ops->join_mesh) 118 return -EOPNOTSUPP; 119 120 if (!setup->chandef.chan) { 121 /* if no channel explicitly given, use preset channel */ 122 setup->chandef = wdev->preset_chandef; 123 } 124 125 if (!setup->chandef.chan) { 126 /* if we don't have that either, use the first usable channel */ 127 enum ieee80211_band band; 128 129 for (band = 0; band < IEEE80211_NUM_BANDS; band++) { 130 struct ieee80211_supported_band *sband; 131 struct ieee80211_channel *chan; 132 int i; 133 134 sband = rdev->wiphy.bands[band]; 135 if (!sband) 136 continue; 137 138 for (i = 0; i < sband->n_channels; i++) { 139 chan = &sband->channels[i]; 140 if (chan->flags & (IEEE80211_CHAN_NO_IBSS | 141 IEEE80211_CHAN_PASSIVE_SCAN | 142 IEEE80211_CHAN_DISABLED | 143 IEEE80211_CHAN_RADAR)) 144 continue; 145 setup->chandef.chan = chan; 146 break; 147 } 148 149 if (setup->chandef.chan) 150 break; 151 } 152 153 /* no usable channel ... */ 154 if (!setup->chandef.chan) 155 return -EINVAL; 156 157 setup->chandef.width = NL80211_CHAN_WIDTH_20_NOHT; 158 setup->chandef.center_freq1 = setup->chandef.chan->center_freq; 159 } 160 161 if (!cfg80211_reg_can_beacon(&rdev->wiphy, &setup->chandef)) 162 return -EINVAL; 163 164 err = cfg80211_can_use_chan(rdev, wdev, setup->chandef.chan, 165 CHAN_MODE_SHARED); 166 if (err) 167 return err; 168 169 err = rdev_join_mesh(rdev, dev, conf, setup); 170 if (!err) { 171 memcpy(wdev->ssid, setup->mesh_id, setup->mesh_id_len); 172 wdev->mesh_id_len = setup->mesh_id_len; 173 wdev->channel = setup->chandef.chan; 174 } 175 176 return err; 177 } 178 179 int cfg80211_join_mesh(struct cfg80211_registered_device *rdev, 180 struct net_device *dev, 181 struct mesh_setup *setup, 182 const struct mesh_config *conf) 183 { 184 struct wireless_dev *wdev = dev->ieee80211_ptr; 185 int err; 186 187 mutex_lock(&rdev->devlist_mtx); 188 wdev_lock(wdev); 189 err = __cfg80211_join_mesh(rdev, dev, setup, conf); 190 wdev_unlock(wdev); 191 mutex_unlock(&rdev->devlist_mtx); 192 193 return err; 194 } 195 196 int cfg80211_set_mesh_channel(struct cfg80211_registered_device *rdev, 197 struct wireless_dev *wdev, 198 struct cfg80211_chan_def *chandef) 199 { 200 int err; 201 202 /* 203 * Workaround for libertas (only!), it puts the interface 204 * into mesh mode but doesn't implement join_mesh. Instead, 205 * it is configured via sysfs and then joins the mesh when 206 * you set the channel. Note that the libertas mesh isn't 207 * compatible with 802.11 mesh. 208 */ 209 if (rdev->ops->libertas_set_mesh_channel) { 210 if (chandef->width != NL80211_CHAN_WIDTH_20_NOHT) 211 return -EINVAL; 212 213 if (!netif_running(wdev->netdev)) 214 return -ENETDOWN; 215 216 err = cfg80211_can_use_chan(rdev, wdev, chandef->chan, 217 CHAN_MODE_SHARED); 218 if (err) 219 return err; 220 221 err = rdev_libertas_set_mesh_channel(rdev, wdev->netdev, 222 chandef->chan); 223 if (!err) 224 wdev->channel = chandef->chan; 225 226 return err; 227 } 228 229 if (wdev->mesh_id_len) 230 return -EBUSY; 231 232 wdev->preset_chandef = *chandef; 233 return 0; 234 } 235 236 void cfg80211_notify_new_peer_candidate(struct net_device *dev, 237 const u8 *macaddr, const u8* ie, u8 ie_len, gfp_t gfp) 238 { 239 struct wireless_dev *wdev = dev->ieee80211_ptr; 240 241 trace_cfg80211_notify_new_peer_candidate(dev, macaddr); 242 if (WARN_ON(wdev->iftype != NL80211_IFTYPE_MESH_POINT)) 243 return; 244 245 nl80211_send_new_peer_candidate(wiphy_to_dev(wdev->wiphy), dev, 246 macaddr, ie, ie_len, gfp); 247 } 248 EXPORT_SYMBOL(cfg80211_notify_new_peer_candidate); 249 250 static int __cfg80211_leave_mesh(struct cfg80211_registered_device *rdev, 251 struct net_device *dev) 252 { 253 struct wireless_dev *wdev = dev->ieee80211_ptr; 254 int err; 255 256 ASSERT_WDEV_LOCK(wdev); 257 258 if (dev->ieee80211_ptr->iftype != NL80211_IFTYPE_MESH_POINT) 259 return -EOPNOTSUPP; 260 261 if (!rdev->ops->leave_mesh) 262 return -EOPNOTSUPP; 263 264 if (!wdev->mesh_id_len) 265 return -ENOTCONN; 266 267 err = rdev_leave_mesh(rdev, dev); 268 if (!err) { 269 wdev->mesh_id_len = 0; 270 wdev->channel = NULL; 271 } 272 273 return err; 274 } 275 276 int cfg80211_leave_mesh(struct cfg80211_registered_device *rdev, 277 struct net_device *dev) 278 { 279 struct wireless_dev *wdev = dev->ieee80211_ptr; 280 int err; 281 282 wdev_lock(wdev); 283 err = __cfg80211_leave_mesh(rdev, dev); 284 wdev_unlock(wdev); 285 286 return err; 287 } 288