net/wireless/mesh.c

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