297 lines
8 KiB
C
Executable file
297 lines
8 KiB
C
Executable file
// SPDX-License-Identifier: GPL-2.0
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#include <linux/ieee80211.h>
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#include <linux/export.h>
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#include <net/cfg80211.h>
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#include "nl80211.h"
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#include "core.h"
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#include "rdev-ops.h"
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/* Default values, timeouts in ms */
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#define MESH_TTL 31
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#define MESH_DEFAULT_ELEMENT_TTL 31
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#define MESH_MAX_RETR 3
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#define MESH_RET_T 100
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#define MESH_CONF_T 100
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#define MESH_HOLD_T 100
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#define MESH_PATH_TIMEOUT 5000
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#define MESH_RANN_INTERVAL 5000
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#define MESH_PATH_TO_ROOT_TIMEOUT 6000
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#define MESH_ROOT_INTERVAL 5000
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#define MESH_ROOT_CONFIRMATION_INTERVAL 2000
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#define MESH_DEFAULT_PLINK_TIMEOUT 1800 /* timeout in seconds */
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/*
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* Minimum interval between two consecutive PREQs originated by the same
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* interface
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*/
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#define MESH_PREQ_MIN_INT 10
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#define MESH_PERR_MIN_INT 100
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#define MESH_DIAM_TRAVERSAL_TIME 50
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#define MESH_RSSI_THRESHOLD 0
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/*
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* A path will be refreshed if it is used PATH_REFRESH_TIME milliseconds
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* before timing out. This way it will remain ACTIVE and no data frames
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* will be unnecessarily held in the pending queue.
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*/
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#define MESH_PATH_REFRESH_TIME 1000
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#define MESH_MIN_DISCOVERY_TIMEOUT (2 * MESH_DIAM_TRAVERSAL_TIME)
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/* Default maximum number of established plinks per interface */
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#define MESH_MAX_ESTAB_PLINKS 32
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#define MESH_MAX_PREQ_RETRIES 4
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#define MESH_SYNC_NEIGHBOR_OFFSET_MAX 50
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#define MESH_DEFAULT_BEACON_INTERVAL 1000 /* in 1024 us units (=TUs) */
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#define MESH_DEFAULT_DTIM_PERIOD 2
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#define MESH_DEFAULT_AWAKE_WINDOW 10 /* in 1024 us units (=TUs) */
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const struct mesh_config default_mesh_config = {
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.dot11MeshRetryTimeout = MESH_RET_T,
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.dot11MeshConfirmTimeout = MESH_CONF_T,
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.dot11MeshHoldingTimeout = MESH_HOLD_T,
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.dot11MeshMaxRetries = MESH_MAX_RETR,
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.dot11MeshTTL = MESH_TTL,
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.element_ttl = MESH_DEFAULT_ELEMENT_TTL,
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.auto_open_plinks = true,
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.dot11MeshMaxPeerLinks = MESH_MAX_ESTAB_PLINKS,
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.dot11MeshNbrOffsetMaxNeighbor = MESH_SYNC_NEIGHBOR_OFFSET_MAX,
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.dot11MeshHWMPactivePathTimeout = MESH_PATH_TIMEOUT,
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.dot11MeshHWMPpreqMinInterval = MESH_PREQ_MIN_INT,
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.dot11MeshHWMPperrMinInterval = MESH_PERR_MIN_INT,
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.dot11MeshHWMPnetDiameterTraversalTime = MESH_DIAM_TRAVERSAL_TIME,
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.dot11MeshHWMPmaxPREQretries = MESH_MAX_PREQ_RETRIES,
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.path_refresh_time = MESH_PATH_REFRESH_TIME,
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.min_discovery_timeout = MESH_MIN_DISCOVERY_TIMEOUT,
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.dot11MeshHWMPRannInterval = MESH_RANN_INTERVAL,
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.dot11MeshGateAnnouncementProtocol = false,
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.dot11MeshForwarding = true,
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.rssi_threshold = MESH_RSSI_THRESHOLD,
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.ht_opmode = IEEE80211_HT_OP_MODE_PROTECTION_NONHT_MIXED,
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.dot11MeshHWMPactivePathToRootTimeout = MESH_PATH_TO_ROOT_TIMEOUT,
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.dot11MeshHWMProotInterval = MESH_ROOT_INTERVAL,
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.dot11MeshHWMPconfirmationInterval = MESH_ROOT_CONFIRMATION_INTERVAL,
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.power_mode = NL80211_MESH_POWER_ACTIVE,
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.dot11MeshAwakeWindowDuration = MESH_DEFAULT_AWAKE_WINDOW,
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.plink_timeout = MESH_DEFAULT_PLINK_TIMEOUT,
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};
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const struct mesh_setup default_mesh_setup = {
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/* cfg80211_join_mesh() will pick a channel if needed */
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.sync_method = IEEE80211_SYNC_METHOD_NEIGHBOR_OFFSET,
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.path_sel_proto = IEEE80211_PATH_PROTOCOL_HWMP,
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.path_metric = IEEE80211_PATH_METRIC_AIRTIME,
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.auth_id = 0, /* open */
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.ie = NULL,
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.ie_len = 0,
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.is_secure = false,
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.user_mpm = false,
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.beacon_interval = MESH_DEFAULT_BEACON_INTERVAL,
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.dtim_period = MESH_DEFAULT_DTIM_PERIOD,
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};
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int __cfg80211_join_mesh(struct cfg80211_registered_device *rdev,
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struct net_device *dev,
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struct mesh_setup *setup,
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const struct mesh_config *conf)
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{
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struct wireless_dev *wdev = dev->ieee80211_ptr;
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int err;
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BUILD_BUG_ON(IEEE80211_MAX_SSID_LEN != IEEE80211_MAX_MESH_ID_LEN);
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ASSERT_WDEV_LOCK(wdev);
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if (dev->ieee80211_ptr->iftype != NL80211_IFTYPE_MESH_POINT)
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return -EOPNOTSUPP;
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if (!(rdev->wiphy.flags & WIPHY_FLAG_MESH_AUTH) &&
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setup->is_secure)
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return -EOPNOTSUPP;
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if (wdev->mesh_id_len)
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return -EALREADY;
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if (!setup->mesh_id_len)
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return -EINVAL;
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if (!rdev->ops->join_mesh)
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return -EOPNOTSUPP;
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if (!setup->chandef.chan) {
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/* if no channel explicitly given, use preset channel */
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setup->chandef = wdev->preset_chandef;
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}
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if (!setup->chandef.chan) {
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/* if we don't have that either, use the first usable channel */
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enum nl80211_band band;
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for (band = 0; band < NUM_NL80211_BANDS; band++) {
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struct ieee80211_supported_band *sband;
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struct ieee80211_channel *chan;
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int i;
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sband = rdev->wiphy.bands[band];
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if (!sband)
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continue;
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for (i = 0; i < sband->n_channels; i++) {
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chan = &sband->channels[i];
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if (chan->flags & (IEEE80211_CHAN_NO_IR |
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IEEE80211_CHAN_DISABLED |
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IEEE80211_CHAN_RADAR))
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continue;
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setup->chandef.chan = chan;
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break;
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}
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if (setup->chandef.chan)
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break;
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}
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/* no usable channel ... */
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if (!setup->chandef.chan)
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return -EINVAL;
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setup->chandef.width = NL80211_CHAN_WIDTH_20_NOHT;
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setup->chandef.center_freq1 = setup->chandef.chan->center_freq;
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}
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/*
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* check if basic rates are available otherwise use mandatory rates as
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* basic rates
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*/
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if (!setup->basic_rates) {
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enum nl80211_bss_scan_width scan_width;
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struct ieee80211_supported_band *sband =
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rdev->wiphy.bands[setup->chandef.chan->band];
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if (setup->chandef.chan->band == NL80211_BAND_2GHZ) {
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int i;
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/*
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* Older versions selected the mandatory rates for
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* 2.4 GHz as well, but were broken in that only
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* 1 Mbps was regarded as a mandatory rate. Keep
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* using just 1 Mbps as the default basic rate for
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* mesh to be interoperable with older versions.
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*/
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for (i = 0; i < sband->n_bitrates; i++) {
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if (sband->bitrates[i].bitrate == 10) {
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setup->basic_rates = BIT(i);
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break;
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}
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}
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} else {
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scan_width = cfg80211_chandef_to_scan_width(&setup->chandef);
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setup->basic_rates = ieee80211_mandatory_rates(sband,
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scan_width);
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}
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}
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err = cfg80211_chandef_dfs_required(&rdev->wiphy,
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&setup->chandef,
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NL80211_IFTYPE_MESH_POINT);
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if (err < 0)
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return err;
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if (err > 0 && !setup->userspace_handles_dfs)
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return -EINVAL;
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if (!cfg80211_reg_can_beacon(&rdev->wiphy, &setup->chandef,
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NL80211_IFTYPE_MESH_POINT))
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return -EINVAL;
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err = rdev_join_mesh(rdev, dev, conf, setup);
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if (!err) {
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memcpy(wdev->ssid, setup->mesh_id, setup->mesh_id_len);
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wdev->mesh_id_len = setup->mesh_id_len;
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wdev->chandef = setup->chandef;
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wdev->beacon_interval = setup->beacon_interval;
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}
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return err;
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}
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int cfg80211_set_mesh_channel(struct cfg80211_registered_device *rdev,
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struct wireless_dev *wdev,
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struct cfg80211_chan_def *chandef)
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{
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int err;
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/*
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* Workaround for libertas (only!), it puts the interface
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* into mesh mode but doesn't implement join_mesh. Instead,
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* it is configured via sysfs and then joins the mesh when
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* you set the channel. Note that the libertas mesh isn't
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* compatible with 802.11 mesh.
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*/
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if (rdev->ops->libertas_set_mesh_channel) {
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if (chandef->width != NL80211_CHAN_WIDTH_20_NOHT)
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return -EINVAL;
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if (!netif_running(wdev->netdev))
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return -ENETDOWN;
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err = rdev_libertas_set_mesh_channel(rdev, wdev->netdev,
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chandef->chan);
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if (!err)
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wdev->chandef = *chandef;
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return err;
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}
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if (wdev->mesh_id_len)
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return -EBUSY;
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wdev->preset_chandef = *chandef;
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return 0;
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}
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int __cfg80211_leave_mesh(struct cfg80211_registered_device *rdev,
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struct net_device *dev)
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{
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struct wireless_dev *wdev = dev->ieee80211_ptr;
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int err;
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ASSERT_WDEV_LOCK(wdev);
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if (dev->ieee80211_ptr->iftype != NL80211_IFTYPE_MESH_POINT)
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return -EOPNOTSUPP;
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if (!rdev->ops->leave_mesh)
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return -EOPNOTSUPP;
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if (!wdev->mesh_id_len)
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return -ENOTCONN;
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err = rdev_leave_mesh(rdev, dev);
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if (!err) {
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wdev->conn_owner_nlportid = 0;
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wdev->mesh_id_len = 0;
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wdev->beacon_interval = 0;
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memset(&wdev->chandef, 0, sizeof(wdev->chandef));
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rdev_set_qos_map(rdev, dev, NULL);
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cfg80211_sched_dfs_chan_update(rdev);
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}
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return err;
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}
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int cfg80211_leave_mesh(struct cfg80211_registered_device *rdev,
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struct net_device *dev)
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{
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struct wireless_dev *wdev = dev->ieee80211_ptr;
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int err;
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wdev_lock(wdev);
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err = __cfg80211_leave_mesh(rdev, dev);
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wdev_unlock(wdev);
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return err;
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}
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