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