linux/net/wireless/mesh.c
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   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#define MESH_PATH_TO_ROOT_TIMEOUT      6000
  18#define MESH_ROOT_INTERVAL     5000
  19#define MESH_ROOT_CONFIRMATION_INTERVAL 2000
  20
  21/*
  22 * Minimum interval between two consecutive PREQs originated by the same
  23 * interface
  24 */
  25#define MESH_PREQ_MIN_INT       10
  26#define MESH_PERR_MIN_INT       100
  27#define MESH_DIAM_TRAVERSAL_TIME 50
  28
  29#define MESH_RSSI_THRESHOLD     0
  30
  31/*
  32 * A path will be refreshed if it is used PATH_REFRESH_TIME milliseconds
  33 * before timing out.  This way it will remain ACTIVE and no data frames
  34 * will be unnecessarily held in the pending queue.
  35 */
  36#define MESH_PATH_REFRESH_TIME                  1000
  37#define MESH_MIN_DISCOVERY_TIMEOUT (2 * MESH_DIAM_TRAVERSAL_TIME)
  38
  39/* Default maximum number of established plinks per interface */
  40#define MESH_MAX_ESTAB_PLINKS   32
  41
  42#define MESH_MAX_PREQ_RETRIES   4
  43
  44#define MESH_SYNC_NEIGHBOR_OFFSET_MAX 50
  45
  46const struct mesh_config default_mesh_config = {
  47        .dot11MeshRetryTimeout = MESH_RET_T,
  48        .dot11MeshConfirmTimeout = MESH_CONF_T,
  49        .dot11MeshHoldingTimeout = MESH_HOLD_T,
  50        .dot11MeshMaxRetries = MESH_MAX_RETR,
  51        .dot11MeshTTL = MESH_TTL,
  52        .element_ttl = MESH_DEFAULT_ELEMENT_TTL,
  53        .auto_open_plinks = true,
  54        .dot11MeshMaxPeerLinks = MESH_MAX_ESTAB_PLINKS,
  55        .dot11MeshNbrOffsetMaxNeighbor = MESH_SYNC_NEIGHBOR_OFFSET_MAX,
  56        .dot11MeshHWMPactivePathTimeout = MESH_PATH_TIMEOUT,
  57        .dot11MeshHWMPpreqMinInterval = MESH_PREQ_MIN_INT,
  58        .dot11MeshHWMPperrMinInterval = MESH_PERR_MIN_INT,
  59        .dot11MeshHWMPnetDiameterTraversalTime = MESH_DIAM_TRAVERSAL_TIME,
  60        .dot11MeshHWMPmaxPREQretries = MESH_MAX_PREQ_RETRIES,
  61        .path_refresh_time = MESH_PATH_REFRESH_TIME,
  62        .min_discovery_timeout = MESH_MIN_DISCOVERY_TIMEOUT,
  63        .dot11MeshHWMPRannInterval = MESH_RANN_INTERVAL,
  64        .dot11MeshGateAnnouncementProtocol = false,
  65        .dot11MeshForwarding = true,
  66        .rssi_threshold = MESH_RSSI_THRESHOLD,
  67        .ht_opmode = IEEE80211_HT_OP_MODE_PROTECTION_NONHT_MIXED,
  68        .dot11MeshHWMPactivePathToRootTimeout = MESH_PATH_TO_ROOT_TIMEOUT,
  69        .dot11MeshHWMProotInterval = MESH_ROOT_INTERVAL,
  70        .dot11MeshHWMPconfirmationInterval = MESH_ROOT_CONFIRMATION_INTERVAL,
  71};
  72
  73const struct mesh_setup default_mesh_setup = {
  74        /* cfg80211_join_mesh() will pick a channel if needed */
  75        .channel = NULL,
  76        .channel_type = NL80211_CHAN_NO_HT,
  77        .sync_method = IEEE80211_SYNC_METHOD_NEIGHBOR_OFFSET,
  78        .path_sel_proto = IEEE80211_PATH_PROTOCOL_HWMP,
  79        .path_metric = IEEE80211_PATH_METRIC_AIRTIME,
  80        .ie = NULL,
  81        .ie_len = 0,
  82        .is_secure = false,
  83};
  84
  85int __cfg80211_join_mesh(struct cfg80211_registered_device *rdev,
  86                         struct net_device *dev,
  87                         struct mesh_setup *setup,
  88                         const struct mesh_config *conf)
  89{
  90        struct wireless_dev *wdev = dev->ieee80211_ptr;
  91        int err;
  92
  93        BUILD_BUG_ON(IEEE80211_MAX_SSID_LEN != IEEE80211_MAX_MESH_ID_LEN);
  94
  95        ASSERT_WDEV_LOCK(wdev);
  96
  97        if (dev->ieee80211_ptr->iftype != NL80211_IFTYPE_MESH_POINT)
  98                return -EOPNOTSUPP;
  99
 100        if (!(rdev->wiphy.flags & WIPHY_FLAG_MESH_AUTH) &&
 101              setup->is_secure)
 102                return -EOPNOTSUPP;
 103
 104        if (wdev->mesh_id_len)
 105                return -EALREADY;
 106
 107        if (!setup->mesh_id_len)
 108                return -EINVAL;
 109
 110        if (!rdev->ops->join_mesh)
 111                return -EOPNOTSUPP;
 112
 113        if (!setup->channel) {
 114                /* if no channel explicitly given, use preset channel */
 115                setup->channel = wdev->preset_chan;
 116                setup->channel_type = wdev->preset_chantype;
 117        }
 118
 119        if (!setup->channel) {
 120                /* if we don't have that either, use the first usable channel */
 121                enum ieee80211_band band;
 122
 123                for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
 124                        struct ieee80211_supported_band *sband;
 125                        struct ieee80211_channel *chan;
 126                        int i;
 127
 128                        sband = rdev->wiphy.bands[band];
 129                        if (!sband)
 130                                continue;
 131
 132                        for (i = 0; i < sband->n_channels; i++) {
 133                                chan = &sband->channels[i];
 134                                if (chan->flags & (IEEE80211_CHAN_NO_IBSS |
 135                                                   IEEE80211_CHAN_PASSIVE_SCAN |
 136                                                   IEEE80211_CHAN_DISABLED |
 137                                                   IEEE80211_CHAN_RADAR))
 138                                        continue;
 139                                setup->channel = chan;
 140                                break;
 141                        }
 142
 143                        if (setup->channel)
 144                                break;
 145                }
 146
 147                /* no usable channel ... */
 148                if (!setup->channel)
 149                        return -EINVAL;
 150
 151                setup->channel_type = NL80211_CHAN_NO_HT;
 152        }
 153
 154        if (!cfg80211_can_beacon_sec_chan(&rdev->wiphy, setup->channel,
 155                                          setup->channel_type))
 156                return -EINVAL;
 157
 158        err = cfg80211_can_use_chan(rdev, wdev, setup->channel,
 159                                    CHAN_MODE_SHARED);
 160        if (err)
 161                return err;
 162
 163        err = rdev->ops->join_mesh(&rdev->wiphy, dev, conf, setup);
 164        if (!err) {
 165                memcpy(wdev->ssid, setup->mesh_id, setup->mesh_id_len);
 166                wdev->mesh_id_len = setup->mesh_id_len;
 167                wdev->channel = setup->channel;
 168        }
 169
 170        return err;
 171}
 172
 173int cfg80211_join_mesh(struct cfg80211_registered_device *rdev,
 174                       struct net_device *dev,
 175                       struct mesh_setup *setup,
 176                       const struct mesh_config *conf)
 177{
 178        struct wireless_dev *wdev = dev->ieee80211_ptr;
 179        int err;
 180
 181        mutex_lock(&rdev->devlist_mtx);
 182        wdev_lock(wdev);
 183        err = __cfg80211_join_mesh(rdev, dev, setup, conf);
 184        wdev_unlock(wdev);
 185        mutex_unlock(&rdev->devlist_mtx);
 186
 187        return err;
 188}
 189
 190int cfg80211_set_mesh_freq(struct cfg80211_registered_device *rdev,
 191                           struct wireless_dev *wdev, int freq,
 192                           enum nl80211_channel_type channel_type)
 193{
 194        struct ieee80211_channel *channel;
 195        int err;
 196
 197        channel = rdev_freq_to_chan(rdev, freq, channel_type);
 198        if (!channel || !cfg80211_can_beacon_sec_chan(&rdev->wiphy,
 199                                                      channel,
 200                                                      channel_type)) {
 201                return -EINVAL;
 202        }
 203
 204        /*
 205         * Workaround for libertas (only!), it puts the interface
 206         * into mesh mode but doesn't implement join_mesh. Instead,
 207         * it is configured via sysfs and then joins the mesh when
 208         * you set the channel. Note that the libertas mesh isn't
 209         * compatible with 802.11 mesh.
 210         */
 211        if (rdev->ops->libertas_set_mesh_channel) {
 212                if (channel_type != NL80211_CHAN_NO_HT)
 213                        return -EINVAL;
 214
 215                if (!netif_running(wdev->netdev))
 216                        return -ENETDOWN;
 217
 218                err = cfg80211_can_use_chan(rdev, wdev, channel,
 219                                            CHAN_MODE_SHARED);
 220                if (err)
 221                        return err;
 222
 223                err = rdev->ops->libertas_set_mesh_channel(&rdev->wiphy,
 224                                                           wdev->netdev,
 225                                                           channel);
 226                if (!err)
 227                        wdev->channel = channel;
 228
 229                return err;
 230        }
 231
 232        if (wdev->mesh_id_len)
 233                return -EBUSY;
 234
 235        wdev->preset_chan = channel;
 236        wdev->preset_chantype = channel_type;
 237        return 0;
 238}
 239
 240void cfg80211_notify_new_peer_candidate(struct net_device *dev,
 241                const u8 *macaddr, const u8* ie, u8 ie_len, gfp_t gfp)
 242{
 243        struct wireless_dev *wdev = dev->ieee80211_ptr;
 244
 245        if (WARN_ON(wdev->iftype != NL80211_IFTYPE_MESH_POINT))
 246                return;
 247
 248        nl80211_send_new_peer_candidate(wiphy_to_dev(wdev->wiphy), dev,
 249                        macaddr, ie, ie_len, gfp);
 250}
 251EXPORT_SYMBOL(cfg80211_notify_new_peer_candidate);
 252
 253static int __cfg80211_leave_mesh(struct cfg80211_registered_device *rdev,
 254                                 struct net_device *dev)
 255{
 256        struct wireless_dev *wdev = dev->ieee80211_ptr;
 257        int err;
 258
 259        ASSERT_WDEV_LOCK(wdev);
 260
 261        if (dev->ieee80211_ptr->iftype != NL80211_IFTYPE_MESH_POINT)
 262                return -EOPNOTSUPP;
 263
 264        if (!rdev->ops->leave_mesh)
 265                return -EOPNOTSUPP;
 266
 267        if (!wdev->mesh_id_len)
 268                return -ENOTCONN;
 269
 270        err = rdev->ops->leave_mesh(&rdev->wiphy, dev);
 271        if (!err) {
 272                wdev->mesh_id_len = 0;
 273                wdev->channel = NULL;
 274        }
 275
 276        return err;
 277}
 278
 279int cfg80211_leave_mesh(struct cfg80211_registered_device *rdev,
 280                        struct net_device *dev)
 281{
 282        struct wireless_dev *wdev = dev->ieee80211_ptr;
 283        int err;
 284
 285        wdev_lock(wdev);
 286        err = __cfg80211_leave_mesh(rdev, dev);
 287        wdev_unlock(wdev);
 288
 289        return err;
 290}
 291
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