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