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 /*
  27  * A path will be refreshed if it is used PATH_REFRESH_TIME milliseconds
  28  * before timing out.  This way it will remain ACTIVE and no data frames
  29  * will be unnecessarily held in the pending queue.
  30  */
  31 #define MESH_PATH_REFRESH_TIME                  1000
  32 #define MESH_MIN_DISCOVERY_TIMEOUT (2 * MESH_DIAM_TRAVERSAL_TIME)
  33
  34 /* Default maximum number of established plinks per interface */
  35 #define MESH_MAX_ESTAB_PLINKS   32
  36
  37 #define MESH_MAX_PREQ_RETRIES   4
  38
  39
  40 const struct mesh_config default_mesh_config = {
  41         .dot11MeshRetryTimeout = MESH_RET_T,
  42         .dot11MeshConfirmTimeout = MESH_CONF_T,
  43         .dot11MeshHoldingTimeout = MESH_HOLD_T,
  44         .dot11MeshMaxRetries = MESH_MAX_RETR,
  45         .dot11MeshTTL = MESH_TTL,
  46         .element_ttl = MESH_DEFAULT_ELEMENT_TTL,
  47         .auto_open_plinks = true,
  48         .dot11MeshMaxPeerLinks = MESH_MAX_ESTAB_PLINKS,
  49         .dot11MeshHWMPactivePathTimeout = MESH_PATH_TIMEOUT,
  50         .dot11MeshHWMPpreqMinInterval = MESH_PREQ_MIN_INT,
  51         .dot11MeshHWMPperrMinInterval = MESH_PERR_MIN_INT,
  52         .dot11MeshHWMPnetDiameterTraversalTime = MESH_DIAM_TRAVERSAL_TIME,
  53         .dot11MeshHWMPmaxPREQretries = MESH_MAX_PREQ_RETRIES,
  54         .path_refresh_time = MESH_PATH_REFRESH_TIME,
  55         .min_discovery_timeout = MESH_MIN_DISCOVERY_TIMEOUT,
  56         .dot11MeshHWMPRannInterval = MESH_RANN_INTERVAL,
  57         .dot11MeshGateAnnouncementProtocol = false,
  58         .dot11MeshForwarding = true,
  59 };
  60
  61 const struct mesh_setup default_mesh_setup = {
  62         .path_sel_proto = IEEE80211_PATH_PROTOCOL_HWMP,
  63         .path_metric = IEEE80211_PATH_METRIC_AIRTIME,
  64         .ie = NULL,
  65         .ie_len = 0,
  66         .is_secure = false,
  67 };
  68
  69 int __cfg80211_join_mesh(struct cfg80211_registered_device *rdev,
  70                          struct net_device *dev,
  71                          const struct mesh_setup *setup,
  72                          const struct mesh_config *conf)
  73 {
  74         struct wireless_dev *wdev = dev->ieee80211_ptr;
  75         int err;
  76
  77         BUILD_BUG_ON(IEEE80211_MAX_SSID_LEN != IEEE80211_MAX_MESH_ID_LEN);
  78
  79         ASSERT_WDEV_LOCK(wdev);
  80
  81         if (dev->ieee80211_ptr->iftype != NL80211_IFTYPE_MESH_POINT)
  82                 return -EOPNOTSUPP;
  83
  84         if (!(rdev->wiphy.flags & WIPHY_FLAG_MESH_AUTH) &&
  85               setup->is_secure)
  86                 return -EOPNOTSUPP;
  87
  88         if (wdev->mesh_id_len)
  89                 return -EALREADY;
  90
  91         if (!setup->mesh_id_len)
  92                 return -EINVAL;
  93
  94         if (!rdev->ops->join_mesh)
  95                 return -EOPNOTSUPP;
  96
  97         err = rdev->ops->join_mesh(&rdev->wiphy, dev, conf, setup);
  98         if (!err) {
  99                 memcpy(wdev->ssid, setup->mesh_id, setup->mesh_id_len);
 100                 wdev->mesh_id_len = setup->mesh_id_len;
 101         }
 102
 103         return err;
 104 }
 105
 106 int cfg80211_join_mesh(struct cfg80211_registered_device *rdev,
 107                        struct net_device *dev,
 108                        const struct mesh_setup *setup,
 109                        const struct mesh_config *conf)
 110 {
 111         struct wireless_dev *wdev = dev->ieee80211_ptr;
 112         int err;
 113
 114         wdev_lock(wdev);
 115         err = __cfg80211_join_mesh(rdev, dev, setup, conf);
 116         wdev_unlock(wdev);
 117
 118         return err;
 119 }
 120
 121 void cfg80211_notify_new_peer_candidate(struct net_device *dev,
 122                 const u8 *macaddr, const u8* ie, u8 ie_len, gfp_t gfp)
 123 {
 124         struct wireless_dev *wdev = dev->ieee80211_ptr;
 125
 126         if (WARN_ON(wdev->iftype != NL80211_IFTYPE_MESH_POINT))
 127                 return;
 128
 129         nl80211_send_new_peer_candidate(wiphy_to_dev(wdev->wiphy), dev,
 130                         macaddr, ie, ie_len, gfp);
 131 }
 132 EXPORT_SYMBOL(cfg80211_notify_new_peer_candidate);
 133
 134 static int __cfg80211_leave_mesh(struct cfg80211_registered_device *rdev,
 135                                  struct net_device *dev)
 136 {
 137         struct wireless_dev *wdev = dev->ieee80211_ptr;
 138         int err;
 139
 140         ASSERT_WDEV_LOCK(wdev);
 141
 142         if (dev->ieee80211_ptr->iftype != NL80211_IFTYPE_MESH_POINT)
 143                 return -EOPNOTSUPP;
 144
 145         if (!rdev->ops->leave_mesh)
 146                 return -EOPNOTSUPP;
 147
 148         if (!wdev->mesh_id_len)
 149                 return -ENOTCONN;
 150
 151         err = rdev->ops->leave_mesh(&rdev->wiphy, dev);
 152         if (!err)
 153                 wdev->mesh_id_len = 0;
 154         return err;
 155 }
 156
 157 int cfg80211_leave_mesh(struct cfg80211_registered_device *rdev,
 158                         struct net_device *dev)
 159 {
 160         struct wireless_dev *wdev = dev->ieee80211_ptr;
 161         int err;
 162
 163         wdev_lock(wdev);
 164         err = __cfg80211_leave_mesh(rdev, dev);
 165         wdev_unlock(wdev);
 166
 167         return err;
 168 }