LXR linux/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
  40const 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};
  59
  60const struct mesh_setup default_mesh_setup = {
  61        .path_sel_proto = IEEE80211_PATH_PROTOCOL_HWMP,
  62        .path_metric = IEEE80211_PATH_METRIC_AIRTIME,
  63        .ie = NULL,
  64        .ie_len = 0,
  65        .is_secure = false,
  66};
  67
  68int __cfg80211_join_mesh(struct cfg80211_registered_device *rdev,
  69                         struct net_device *dev,
  70                         const struct mesh_setup *setup,
  71                         const struct mesh_config *conf)
  72{
  73        struct wireless_dev *wdev = dev->ieee80211_ptr;
  74        int err;
  75
  76        BUILD_BUG_ON(IEEE80211_MAX_SSID_LEN != IEEE80211_MAX_MESH_ID_LEN);
  77
  78        ASSERT_WDEV_LOCK(wdev);
  79
  80        if (dev->ieee80211_ptr->iftype != NL80211_IFTYPE_MESH_POINT)
  81                return -EOPNOTSUPP;
  82
  83        if (!(rdev->wiphy.flags & WIPHY_FLAG_MESH_AUTH) &&
  84              setup->is_secure)
  85                return -EOPNOTSUPP;
  86
  87        if (wdev->mesh_id_len)
  88                return -EALREADY;
  89
  90        if (!setup->mesh_id_len)
  91                return -EINVAL;
  92
  93        if (!rdev->ops->join_mesh)
  94                return -EOPNOTSUPP;
  95
  96        err = rdev->ops->join_mesh(&rdev->wiphy, dev, conf, setup);
  97        if (!err) {
  98                memcpy(wdev->ssid, setup->mesh_id, setup->mesh_id_len);
  99                wdev->mesh_id_len = setup->mesh_id_len;
 100        }
 101
 102        return err;
 103}
 104
 105int cfg80211_join_mesh(struct cfg80211_registered_device *rdev,
 106                       struct net_device *dev,
 107                       const struct mesh_setup *setup,
 108                       const struct mesh_config *conf)
 109{
 110        struct wireless_dev *wdev = dev->ieee80211_ptr;
 111        int err;
 112
 113        wdev_lock(wdev);
 114        err = __cfg80211_join_mesh(rdev, dev, setup, conf);
 115        wdev_unlock(wdev);
 116
 117        return err;
 118}
 119
 120void cfg80211_notify_new_peer_candidate(struct net_device *dev,
 121                const u8 *macaddr, const u8* ie, u8 ie_len, gfp_t gfp)
 122{
 123        struct wireless_dev *wdev = dev->ieee80211_ptr;
 124
 125        if (WARN_ON(wdev->iftype != NL80211_IFTYPE_MESH_POINT))
 126                return;
 127
 128        nl80211_send_new_peer_candidate(wiphy_to_dev(wdev->wiphy), dev,
 129                        macaddr, ie, ie_len, gfp);
 130}
 131EXPORT_SYMBOL(cfg80211_notify_new_peer_candidate);
 132
 133static int __cfg80211_leave_mesh(struct cfg80211_registered_device *rdev,
 134                                 struct net_device *dev)
 135{
 136        struct wireless_dev *wdev = dev->ieee80211_ptr;
 137        int err;
 138
 139        ASSERT_WDEV_LOCK(wdev);
 140
 141        if (dev->ieee80211_ptr->iftype != NL80211_IFTYPE_MESH_POINT)
 142                return -EOPNOTSUPP;
 143
 144        if (!rdev->ops->leave_mesh)
 145                return -EOPNOTSUPP;
 146
 147        if (!wdev->mesh_id_len)
 148                return -ENOTCONN;
 149
 150        err = rdev->ops->leave_mesh(&rdev->wiphy, dev);
 151        if (!err)
 152                wdev->mesh_id_len = 0;
 153        return err;
 154}
 155
 156int cfg80211_leave_mesh(struct cfg80211_registered_device *rdev,
 157                        struct net_device *dev)
 158{
 159        struct wireless_dev *wdev = dev->ieee80211_ptr;
 160        int err;
 161
 162        wdev_lock(wdev);
 163        err = __cfg80211_leave_mesh(rdev, dev);
 164        wdev_unlock(wdev);
 165
 166        return err;
 167}
 168