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 nl80211_band band; 132 133 for (band = 0; band < NUM_NL80211_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_IR | 145 IEEE80211_CHAN_DISABLED | 146 IEEE80211_CHAN_RADAR)) 147 continue; 148 setup->chandef.chan = chan; 149 break; 150 } 151 152 if (setup->chandef.chan) 153 break; 154 } 155 156 /* no usable channel ... */ 157 if (!setup->chandef.chan) 158 return -EINVAL; 159 160 setup->chandef.width = NL80211_CHAN_WIDTH_20_NOHT; 161 setup->chandef.center_freq1 = setup->chandef.chan->center_freq; 162 } 163 164 /* 165 * check if basic rates are available otherwise use mandatory rates as 166 * basic rates 167 */ 168 if (!setup->basic_rates) { 169 enum nl80211_bss_scan_width scan_width; 170 struct ieee80211_supported_band *sband = 171 rdev->wiphy.bands[setup->chandef.chan->band]; 172 scan_width = cfg80211_chandef_to_scan_width(&setup->chandef); 173 setup->basic_rates = ieee80211_mandatory_rates(sband, 174 scan_width); 175 } 176 177 if (!cfg80211_reg_can_beacon(&rdev->wiphy, &setup->chandef, 178 NL80211_IFTYPE_MESH_POINT)) 179 return -EINVAL; 180 181 err = rdev_join_mesh(rdev, dev, conf, setup); 182 if (!err) { 183 memcpy(wdev->ssid, setup->mesh_id, setup->mesh_id_len); 184 wdev->mesh_id_len = setup->mesh_id_len; 185 wdev->chandef = setup->chandef; 186 } 187 188 return err; 189 } 190 191 int cfg80211_join_mesh(struct cfg80211_registered_device *rdev, 192 struct net_device *dev, 193 struct mesh_setup *setup, 194 const struct mesh_config *conf) 195 { 196 struct wireless_dev *wdev = dev->ieee80211_ptr; 197 int err; 198 199 wdev_lock(wdev); 200 err = __cfg80211_join_mesh(rdev, dev, setup, conf); 201 wdev_unlock(wdev); 202 203 return err; 204 } 205 206 int cfg80211_set_mesh_channel(struct cfg80211_registered_device *rdev, 207 struct wireless_dev *wdev, 208 struct cfg80211_chan_def *chandef) 209 { 210 int err; 211 212 /* 213 * Workaround for libertas (only!), it puts the interface 214 * into mesh mode but doesn't implement join_mesh. Instead, 215 * it is configured via sysfs and then joins the mesh when 216 * you set the channel. Note that the libertas mesh isn't 217 * compatible with 802.11 mesh. 218 */ 219 if (rdev->ops->libertas_set_mesh_channel) { 220 if (chandef->width != NL80211_CHAN_WIDTH_20_NOHT) 221 return -EINVAL; 222 223 if (!netif_running(wdev->netdev)) 224 return -ENETDOWN; 225 226 err = rdev_libertas_set_mesh_channel(rdev, wdev->netdev, 227 chandef->chan); 228 if (!err) 229 wdev->chandef = *chandef; 230 231 return err; 232 } 233 234 if (wdev->mesh_id_len) 235 return -EBUSY; 236 237 wdev->preset_chandef = *chandef; 238 return 0; 239 } 240 241 int __cfg80211_leave_mesh(struct cfg80211_registered_device *rdev, 242 struct net_device *dev) 243 { 244 struct wireless_dev *wdev = dev->ieee80211_ptr; 245 int err; 246 247 ASSERT_WDEV_LOCK(wdev); 248 249 if (dev->ieee80211_ptr->iftype != NL80211_IFTYPE_MESH_POINT) 250 return -EOPNOTSUPP; 251 252 if (!rdev->ops->leave_mesh) 253 return -EOPNOTSUPP; 254 255 if (!wdev->mesh_id_len) 256 return -ENOTCONN; 257 258 err = rdev_leave_mesh(rdev, dev); 259 if (!err) { 260 wdev->mesh_id_len = 0; 261 memset(&wdev->chandef, 0, sizeof(wdev->chandef)); 262 rdev_set_qos_map(rdev, dev, NULL); 263 } 264 265 return err; 266 } 267 268 int cfg80211_leave_mesh(struct cfg80211_registered_device *rdev, 269 struct net_device *dev) 270 { 271 struct wireless_dev *wdev = dev->ieee80211_ptr; 272 int err; 273 274 wdev_lock(wdev); 275 err = __cfg80211_leave_mesh(rdev, dev); 276 wdev_unlock(wdev); 277 278 return err; 279 } 280