net/wireless/mesh.c

   1 #include <linux/ieee80211.h>
   2 #include <linux/export.h>
   3 #include <net/cfg80211.h>
   4 #include "nl80211.h"
   5 #include "core.h"
   6
   7 /* Default values, timeouts in ms */
   8 #define MESH_TTL                31
   9 #define MESH_DEFAULT_ELEMENT_TTL 31
  10 #define MESH_MAX_RETR           3
  11 #define MESH_RET_T              100
  12 #define MESH_CONF_T             100
  13 #define MESH_HOLD_T             100
  14
  15 #define MESH_PATH_TIMEOUT       5000
  16 #define MESH_RANN_INTERVAL      5000
  17
  18 /*
  19  * Minimum interval between two consecutive PREQs originated by the same
  20  * interface
  21  */
  22 #define MESH_PREQ_MIN_INT       10
  23 #define MESH_PERR_MIN_INT       100
  24 #define MESH_DIAM_TRAVERSAL_TIME 50
  25
  26 #define MESH_RSSI_THRESHOLD     0
  27
  28 /*
  29  * A path will be refreshed if it is used PATH_REFRESH_TIME milliseconds
  30  * before timing out.  This way it will remain ACTIVE and no data frames
  31  * will be unnecessarily held in the pending queue.
  32  */
  33 #define MESH_PATH_REFRESH_TIME                  1000
  34 #define MESH_MIN_DISCOVERY_TIMEOUT (2 * MESH_DIAM_TRAVERSAL_TIME)
  35
  36 /* Default maximum number of established plinks per interface */
  37 #define MESH_MAX_ESTAB_PLINKS   32
  38
  39 #define MESH_MAX_PREQ_RETRIES   4
  40
  41 #define MESH_SYNC_NEIGHBOR_OFFSET_MAX 50
  42
  43 const struct mesh_config default_mesh_config = {
  44         .dot11MeshRetryTimeout = MESH_RET_T,
  45         .dot11MeshConfirmTimeout = MESH_CONF_T,
  46         .dot11MeshHoldingTimeout = MESH_HOLD_T,
  47         .dot11MeshMaxRetries = MESH_MAX_RETR,
  48         .dot11MeshTTL = MESH_TTL,
  49         .element_ttl = MESH_DEFAULT_ELEMENT_TTL,
  50         .auto_open_plinks = true,
  51         .dot11MeshMaxPeerLinks = MESH_MAX_ESTAB_PLINKS,
  52         .dot11MeshNbrOffsetMaxNeighbor = MESH_SYNC_NEIGHBOR_OFFSET_MAX,
  53         .dot11MeshHWMPactivePathTimeout = MESH_PATH_TIMEOUT,
  54         .dot11MeshHWMPpreqMinInterval = MESH_PREQ_MIN_INT,
  55         .dot11MeshHWMPperrMinInterval = MESH_PERR_MIN_INT,
  56         .dot11MeshHWMPnetDiameterTraversalTime = MESH_DIAM_TRAVERSAL_TIME,
  57         .dot11MeshHWMPmaxPREQretries = MESH_MAX_PREQ_RETRIES,
  58         .path_refresh_time = MESH_PATH_REFRESH_TIME,
  59         .min_discovery_timeout = MESH_MIN_DISCOVERY_TIMEOUT,
  60         .dot11MeshHWMPRannInterval = MESH_RANN_INTERVAL,
  61         .dot11MeshGateAnnouncementProtocol = false,
  62         .dot11MeshForwarding = true,
  63         .rssi_threshold = MESH_RSSI_THRESHOLD,
  64 };
  65
  66 const struct mesh_setup default_mesh_setup = {
  67         .sync_method = IEEE80211_SYNC_METHOD_NEIGHBOR_OFFSET,
  68         .path_sel_proto = IEEE80211_PATH_PROTOCOL_HWMP,
  69         .path_metric = IEEE80211_PATH_METRIC_AIRTIME,
  70         .ie = NULL,
  71         .ie_len = 0,
  72         .is_secure = false,
  73 };
  74
  75 int __cfg80211_join_mesh(struct cfg80211_registered_device *rdev,
  76                          struct net_device *dev,
  77                          const struct mesh_setup *setup,
  78                          const struct mesh_config *conf)
  79 {
  80         struct wireless_dev *wdev = dev->ieee80211_ptr;
  81         int err;
  82
  83         BUILD_BUG_ON(IEEE80211_MAX_SSID_LEN != IEEE80211_MAX_MESH_ID_LEN);
  84
  85         ASSERT_WDEV_LOCK(wdev);
  86
  87         if (dev->ieee80211_ptr->iftype != NL80211_IFTYPE_MESH_POINT)
  88                 return -EOPNOTSUPP;
  89
  90         if (!(rdev->wiphy.flags & WIPHY_FLAG_MESH_AUTH) &&
  91               setup->is_secure)
  92                 return -EOPNOTSUPP;
  93
  94         if (wdev->mesh_id_len)
  95                 return -EALREADY;
  96
  97         if (!setup->mesh_id_len)
  98                 return -EINVAL;
  99
 100         if (!rdev->ops->join_mesh)
 101                 return -EOPNOTSUPP;
 102
 103         err = rdev->ops->join_mesh(&rdev->wiphy, dev, conf, setup);
 104         if (!err) {
 105                 memcpy(wdev->ssid, setup->mesh_id, setup->mesh_id_len);
 106                 wdev->mesh_id_len = setup->mesh_id_len;
 107         }
 108
 109         return err;
 110 }
 111
 112 int cfg80211_join_mesh(struct cfg80211_registered_device *rdev,
 113                        struct net_device *dev,
 114                        const struct mesh_setup *setup,
 115                        const struct mesh_config *conf)
 116 {
 117         struct wireless_dev *wdev = dev->ieee80211_ptr;
 118         int err;
 119
 120         wdev_lock(wdev);
 121         err = __cfg80211_join_mesh(rdev, dev, setup, conf);
 122         wdev_unlock(wdev);
 123
 124         return err;
 125 }
 126
 127 void cfg80211_notify_new_peer_candidate(struct net_device *dev,
 128                 const u8 *macaddr, const u8* ie, u8 ie_len, gfp_t gfp)
 129 {
 130         struct wireless_dev *wdev = dev->ieee80211_ptr;
 131
 132         if (WARN_ON(wdev->iftype != NL80211_IFTYPE_MESH_POINT))
 133                 return;
 134
 135         nl80211_send_new_peer_candidate(wiphy_to_dev(wdev->wiphy), dev,
 136                         macaddr, ie, ie_len, gfp);
 137 }
 138 EXPORT_SYMBOL(cfg80211_notify_new_peer_candidate);
 139
 140 static int __cfg80211_leave_mesh(struct cfg80211_registered_device *rdev,
 141                                  struct net_device *dev)
 142 {
 143         struct wireless_dev *wdev = dev->ieee80211_ptr;
 144         int err;
 145
 146         ASSERT_WDEV_LOCK(wdev);
 147
 148         if (dev->ieee80211_ptr->iftype != NL80211_IFTYPE_MESH_POINT)
 149                 return -EOPNOTSUPP;
 150
 151         if (!rdev->ops->leave_mesh)
 152                 return -EOPNOTSUPP;
 153
 154         if (!wdev->mesh_id_len)
 155                 return -ENOTCONN;
 156
 157         err = rdev->ops->leave_mesh(&rdev->wiphy, dev);
 158         if (!err)
 159                 wdev->mesh_id_len = 0;
 160         return err;
 161 }
 162
 163 int cfg80211_leave_mesh(struct cfg80211_registered_device *rdev,
 164                         struct net_device *dev)
 165 {
 166         struct wireless_dev *wdev = dev->ieee80211_ptr;
 167         int err;
 168
 169         wdev_lock(wdev);
 170         err = __cfg80211_leave_mesh(rdev, dev);
 171         wdev_unlock(wdev);
 172
 173         return err;
 174 }