net/wireless/mesh.c

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