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TOMOYO Linux Cross Reference
Linux/net/wireless/mesh.c

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  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 

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