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
  42 const struct mesh_config default_mesh_config = {
  43         .dot11MeshRetryTimeout = MESH_RET_T,
  44         .dot11MeshConfirmTimeout = MESH_CONF_T,
  45         .dot11MeshHoldingTimeout = MESH_HOLD_T,
  46         .dot11MeshMaxRetries = MESH_MAX_RETR,
  47         .dot11MeshTTL = MESH_TTL,
  48         .element_ttl = MESH_DEFAULT_ELEMENT_TTL,
  49         .auto_open_plinks = true,
  50         .dot11MeshMaxPeerLinks = MESH_MAX_ESTAB_PLINKS,
  51         .dot11MeshHWMPactivePathTimeout = MESH_PATH_TIMEOUT,
  52         .dot11MeshHWMPpreqMinInterval = MESH_PREQ_MIN_INT,
  53         .dot11MeshHWMPperrMinInterval = MESH_PERR_MIN_INT,
  54         .dot11MeshHWMPnetDiameterTraversalTime = MESH_DIAM_TRAVERSAL_TIME,
  55         .dot11MeshHWMPmaxPREQretries = MESH_MAX_PREQ_RETRIES,
  56         .path_refresh_time = MESH_PATH_REFRESH_TIME,
  57         .min_discovery_timeout = MESH_MIN_DISCOVERY_TIMEOUT,
  58         .dot11MeshHWMPRannInterval = MESH_RANN_INTERVAL,
  59         .dot11MeshGateAnnouncementProtocol = false,
  60         .dot11MeshForwarding = true,
  61         .rssi_threshold = MESH_RSSI_THRESHOLD,
  62 };
  63
  64 const struct mesh_setup default_mesh_setup = {
  65         .path_sel_proto = IEEE80211_PATH_PROTOCOL_HWMP,
  66         .path_metric = IEEE80211_PATH_METRIC_AIRTIME,
  67         .ie = NULL,
  68         .ie_len = 0,
  69         .is_secure = false,
  70 };
  71
  72 int __cfg80211_join_mesh(struct cfg80211_registered_device *rdev,
  73                          struct net_device *dev,
  74                          const struct mesh_setup *setup,
  75                          const struct mesh_config *conf)
  76 {
  77         struct wireless_dev *wdev = dev->ieee80211_ptr;
  78         int err;
  79
  80         BUILD_BUG_ON(IEEE80211_MAX_SSID_LEN != IEEE80211_MAX_MESH_ID_LEN);
  81
  82         ASSERT_WDEV_LOCK(wdev);
  83
  84         if (dev->ieee80211_ptr->iftype != NL80211_IFTYPE_MESH_POINT)
  85                 return -EOPNOTSUPP;
  86
  87         if (!(rdev->wiphy.flags & WIPHY_FLAG_MESH_AUTH) &&
  88               setup->is_secure)
  89                 return -EOPNOTSUPP;
  90
  91         if (wdev->mesh_id_len)
  92                 return -EALREADY;
  93
  94         if (!setup->mesh_id_len)
  95                 return -EINVAL;
  96
  97         if (!rdev->ops->join_mesh)
  98                 return -EOPNOTSUPP;
  99
 100         err = rdev->ops->join_mesh(&rdev->wiphy, dev, conf, setup);
 101         if (!err) {
 102                 memcpy(wdev->ssid, setup->mesh_id, setup->mesh_id_len);
 103                 wdev->mesh_id_len = setup->mesh_id_len;
 104         }
 105
 106         return err;
 107 }
 108
 109 int cfg80211_join_mesh(struct cfg80211_registered_device *rdev,
 110                        struct net_device *dev,
 111                        const struct mesh_setup *setup,
 112                        const struct mesh_config *conf)
 113 {
 114         struct wireless_dev *wdev = dev->ieee80211_ptr;
 115         int err;
 116
 117         wdev_lock(wdev);
 118         err = __cfg80211_join_mesh(rdev, dev, setup, conf);
 119         wdev_unlock(wdev);
 120
 121         return err;
 122 }
 123
 124 void cfg80211_notify_new_peer_candidate(struct net_device *dev,
 125                 const u8 *macaddr, const u8* ie, u8 ie_len, gfp_t gfp)
 126 {
 127         struct wireless_dev *wdev = dev->ieee80211_ptr;
 128
 129         if (WARN_ON(wdev->iftype != NL80211_IFTYPE_MESH_POINT))
 130                 return;
 131
 132         nl80211_send_new_peer_candidate(wiphy_to_dev(wdev->wiphy), dev,
 133                         macaddr, ie, ie_len, gfp);
 134 }
 135 EXPORT_SYMBOL(cfg80211_notify_new_peer_candidate);
 136
 137 static int __cfg80211_leave_mesh(struct cfg80211_registered_device *rdev,
 138                                  struct net_device *dev)
 139 {
 140         struct wireless_dev *wdev = dev->ieee80211_ptr;
 141         int err;
 142
 143         ASSERT_WDEV_LOCK(wdev);
 144
 145         if (dev->ieee80211_ptr->iftype != NL80211_IFTYPE_MESH_POINT)
 146                 return -EOPNOTSUPP;
 147
 148         if (!rdev->ops->leave_mesh)
 149                 return -EOPNOTSUPP;
 150
 151         if (!wdev->mesh_id_len)
 152                 return -ENOTCONN;
 153
 154         err = rdev->ops->leave_mesh(&rdev->wiphy, dev);
 155         if (!err)
 156                 wdev->mesh_id_len = 0;
 157         return err;
 158 }
 159
 160 int cfg80211_leave_mesh(struct cfg80211_registered_device *rdev,
 161                         struct net_device *dev)
 162 {
 163         struct wireless_dev *wdev = dev->ieee80211_ptr;
 164         int err;
 165
 166         wdev_lock(wdev);
 167         err = __cfg80211_leave_mesh(rdev, dev);
 168         wdev_unlock(wdev);
 169
 170         return err;
 171 }