| // SPDX-License-Identifier: GPL-2.0 |
| /* |
| * Portions |
| * Copyright (C) 2022-2024 Intel Corporation |
| */ |
| #include <linux/ieee80211.h> |
| #include <linux/export.h> |
| #include <net/cfg80211.h> |
| #include "nl80211.h" |
| #include "core.h" |
| #include "rdev-ops.h" |
| |
| /* Default values, timeouts in ms */ |
| #define MESH_TTL 31 |
| #define MESH_DEFAULT_ELEMENT_TTL 31 |
| #define MESH_MAX_RETR 3 |
| #define MESH_RET_T 100 |
| #define MESH_CONF_T 100 |
| #define MESH_HOLD_T 100 |
| |
| #define MESH_PATH_TIMEOUT 5000 |
| #define MESH_RANN_INTERVAL 5000 |
| #define MESH_PATH_TO_ROOT_TIMEOUT 6000 |
| #define MESH_ROOT_INTERVAL 5000 |
| #define MESH_ROOT_CONFIRMATION_INTERVAL 2000 |
| #define MESH_DEFAULT_PLINK_TIMEOUT 1800 /* timeout in seconds */ |
| |
| /* |
| * Minimum interval between two consecutive PREQs originated by the same |
| * interface |
| */ |
| #define MESH_PREQ_MIN_INT 10 |
| #define MESH_PERR_MIN_INT 100 |
| #define MESH_DIAM_TRAVERSAL_TIME 50 |
| |
| #define MESH_RSSI_THRESHOLD 0 |
| |
| /* |
| * A path will be refreshed if it is used PATH_REFRESH_TIME milliseconds |
| * before timing out. This way it will remain ACTIVE and no data frames |
| * will be unnecessarily held in the pending queue. |
| */ |
| #define MESH_PATH_REFRESH_TIME 1000 |
| #define MESH_MIN_DISCOVERY_TIMEOUT (2 * MESH_DIAM_TRAVERSAL_TIME) |
| |
| /* Default maximum number of established plinks per interface */ |
| #define MESH_MAX_ESTAB_PLINKS 32 |
| |
| #define MESH_MAX_PREQ_RETRIES 4 |
| |
| #define MESH_SYNC_NEIGHBOR_OFFSET_MAX 50 |
| |
| #define MESH_DEFAULT_BEACON_INTERVAL 1000 /* in 1024 us units (=TUs) */ |
| #define MESH_DEFAULT_DTIM_PERIOD 2 |
| #define MESH_DEFAULT_AWAKE_WINDOW 10 /* in 1024 us units (=TUs) */ |
| |
| const struct mesh_config default_mesh_config = { |
| .dot11MeshRetryTimeout = MESH_RET_T, |
| .dot11MeshConfirmTimeout = MESH_CONF_T, |
| .dot11MeshHoldingTimeout = MESH_HOLD_T, |
| .dot11MeshMaxRetries = MESH_MAX_RETR, |
| .dot11MeshTTL = MESH_TTL, |
| .element_ttl = MESH_DEFAULT_ELEMENT_TTL, |
| .auto_open_plinks = true, |
| .dot11MeshMaxPeerLinks = MESH_MAX_ESTAB_PLINKS, |
| .dot11MeshNbrOffsetMaxNeighbor = MESH_SYNC_NEIGHBOR_OFFSET_MAX, |
| .dot11MeshHWMPactivePathTimeout = MESH_PATH_TIMEOUT, |
| .dot11MeshHWMPpreqMinInterval = MESH_PREQ_MIN_INT, |
| .dot11MeshHWMPperrMinInterval = MESH_PERR_MIN_INT, |
| .dot11MeshHWMPnetDiameterTraversalTime = MESH_DIAM_TRAVERSAL_TIME, |
| .dot11MeshHWMPmaxPREQretries = MESH_MAX_PREQ_RETRIES, |
| .path_refresh_time = MESH_PATH_REFRESH_TIME, |
| .min_discovery_timeout = MESH_MIN_DISCOVERY_TIMEOUT, |
| .dot11MeshHWMPRannInterval = MESH_RANN_INTERVAL, |
| .dot11MeshGateAnnouncementProtocol = false, |
| .dot11MeshForwarding = true, |
| .rssi_threshold = MESH_RSSI_THRESHOLD, |
| .ht_opmode = IEEE80211_HT_OP_MODE_PROTECTION_NONHT_MIXED, |
| .dot11MeshHWMPactivePathToRootTimeout = MESH_PATH_TO_ROOT_TIMEOUT, |
| .dot11MeshHWMProotInterval = MESH_ROOT_INTERVAL, |
| .dot11MeshHWMPconfirmationInterval = MESH_ROOT_CONFIRMATION_INTERVAL, |
| .power_mode = NL80211_MESH_POWER_ACTIVE, |
| .dot11MeshAwakeWindowDuration = MESH_DEFAULT_AWAKE_WINDOW, |
| .plink_timeout = MESH_DEFAULT_PLINK_TIMEOUT, |
| .dot11MeshNolearn = false, |
| }; |
| |
| const struct mesh_setup default_mesh_setup = { |
| /* cfg80211_join_mesh() will pick a channel if needed */ |
| .sync_method = IEEE80211_SYNC_METHOD_NEIGHBOR_OFFSET, |
| .path_sel_proto = IEEE80211_PATH_PROTOCOL_HWMP, |
| .path_metric = IEEE80211_PATH_METRIC_AIRTIME, |
| .auth_id = 0, /* open */ |
| .ie = NULL, |
| .ie_len = 0, |
| .is_secure = false, |
| .user_mpm = false, |
| .beacon_interval = MESH_DEFAULT_BEACON_INTERVAL, |
| .dtim_period = MESH_DEFAULT_DTIM_PERIOD, |
| }; |
| |
| int __cfg80211_join_mesh(struct cfg80211_registered_device *rdev, |
| struct net_device *dev, |
| struct mesh_setup *setup, |
| const struct mesh_config *conf) |
| { |
| struct wireless_dev *wdev = dev->ieee80211_ptr; |
| int err; |
| |
| BUILD_BUG_ON(IEEE80211_MAX_SSID_LEN != IEEE80211_MAX_MESH_ID_LEN); |
| |
| lockdep_assert_wiphy(wdev->wiphy); |
| |
| if (dev->ieee80211_ptr->iftype != NL80211_IFTYPE_MESH_POINT) |
| return -EOPNOTSUPP; |
| |
| if (!(rdev->wiphy.flags & WIPHY_FLAG_MESH_AUTH) && |
| setup->is_secure) |
| return -EOPNOTSUPP; |
| |
| if (wdev->u.mesh.id_len) |
| return -EALREADY; |
| |
| if (!setup->mesh_id_len) |
| return -EINVAL; |
| |
| if (!rdev->ops->join_mesh) |
| return -EOPNOTSUPP; |
| |
| if (wdev->cac_started) |
| return -EBUSY; |
| |
| if (!setup->chandef.chan) { |
| /* if no channel explicitly given, use preset channel */ |
| setup->chandef = wdev->u.mesh.preset_chandef; |
| } |
| |
| if (!setup->chandef.chan) { |
| /* if we don't have that either, use the first usable channel */ |
| enum nl80211_band band; |
| |
| for (band = 0; band < NUM_NL80211_BANDS; band++) { |
| struct ieee80211_supported_band *sband; |
| struct ieee80211_channel *chan; |
| int i; |
| |
| sband = rdev->wiphy.bands[band]; |
| if (!sband) |
| continue; |
| |
| for (i = 0; i < sband->n_channels; i++) { |
| chan = &sband->channels[i]; |
| if (chan->flags & (IEEE80211_CHAN_NO_IR | |
| IEEE80211_CHAN_DISABLED | |
| IEEE80211_CHAN_RADAR)) |
| continue; |
| setup->chandef.chan = chan; |
| break; |
| } |
| |
| if (setup->chandef.chan) |
| break; |
| } |
| |
| /* no usable channel ... */ |
| if (!setup->chandef.chan) |
| return -EINVAL; |
| |
| setup->chandef.width = NL80211_CHAN_WIDTH_20_NOHT; |
| setup->chandef.center_freq1 = setup->chandef.chan->center_freq; |
| } |
| |
| /* |
| * check if basic rates are available otherwise use mandatory rates as |
| * basic rates |
| */ |
| if (!setup->basic_rates) { |
| struct ieee80211_supported_band *sband = |
| rdev->wiphy.bands[setup->chandef.chan->band]; |
| |
| if (setup->chandef.chan->band == NL80211_BAND_2GHZ) { |
| int i; |
| |
| /* |
| * Older versions selected the mandatory rates for |
| * 2.4 GHz as well, but were broken in that only |
| * 1 Mbps was regarded as a mandatory rate. Keep |
| * using just 1 Mbps as the default basic rate for |
| * mesh to be interoperable with older versions. |
| */ |
| for (i = 0; i < sband->n_bitrates; i++) { |
| if (sband->bitrates[i].bitrate == 10) { |
| setup->basic_rates = BIT(i); |
| break; |
| } |
| } |
| } else { |
| setup->basic_rates = ieee80211_mandatory_rates(sband); |
| } |
| } |
| |
| err = cfg80211_chandef_dfs_required(&rdev->wiphy, |
| &setup->chandef, |
| NL80211_IFTYPE_MESH_POINT); |
| if (err < 0) |
| return err; |
| if (err > 0 && !setup->userspace_handles_dfs) |
| return -EINVAL; |
| |
| if (!cfg80211_reg_can_beacon(&rdev->wiphy, &setup->chandef, |
| NL80211_IFTYPE_MESH_POINT)) |
| return -EINVAL; |
| |
| err = rdev_join_mesh(rdev, dev, conf, setup); |
| if (!err) { |
| memcpy(wdev->u.mesh.id, setup->mesh_id, setup->mesh_id_len); |
| wdev->u.mesh.id_len = setup->mesh_id_len; |
| wdev->u.mesh.chandef = setup->chandef; |
| wdev->u.mesh.beacon_interval = setup->beacon_interval; |
| } |
| |
| return err; |
| } |
| |
| int cfg80211_set_mesh_channel(struct cfg80211_registered_device *rdev, |
| struct wireless_dev *wdev, |
| struct cfg80211_chan_def *chandef) |
| { |
| int err; |
| |
| /* |
| * Workaround for libertas (only!), it puts the interface |
| * into mesh mode but doesn't implement join_mesh. Instead, |
| * it is configured via sysfs and then joins the mesh when |
| * you set the channel. Note that the libertas mesh isn't |
| * compatible with 802.11 mesh. |
| */ |
| if (rdev->ops->libertas_set_mesh_channel) { |
| if (chandef->width != NL80211_CHAN_WIDTH_20_NOHT) |
| return -EINVAL; |
| |
| if (!netif_running(wdev->netdev)) |
| return -ENETDOWN; |
| |
| err = rdev_libertas_set_mesh_channel(rdev, wdev->netdev, |
| chandef->chan); |
| if (!err) |
| wdev->u.mesh.chandef = *chandef; |
| |
| return err; |
| } |
| |
| if (wdev->u.mesh.id_len) |
| return -EBUSY; |
| |
| wdev->u.mesh.preset_chandef = *chandef; |
| return 0; |
| } |
| |
| int cfg80211_leave_mesh(struct cfg80211_registered_device *rdev, |
| struct net_device *dev) |
| { |
| struct wireless_dev *wdev = dev->ieee80211_ptr; |
| int err; |
| |
| lockdep_assert_wiphy(wdev->wiphy); |
| |
| if (dev->ieee80211_ptr->iftype != NL80211_IFTYPE_MESH_POINT) |
| return -EOPNOTSUPP; |
| |
| if (!rdev->ops->leave_mesh) |
| return -EOPNOTSUPP; |
| |
| if (!wdev->u.mesh.id_len) |
| return -ENOTCONN; |
| |
| err = rdev_leave_mesh(rdev, dev); |
| if (!err) { |
| wdev->conn_owner_nlportid = 0; |
| wdev->u.mesh.id_len = 0; |
| wdev->u.mesh.beacon_interval = 0; |
| memset(&wdev->u.mesh.chandef, 0, |
| sizeof(wdev->u.mesh.chandef)); |
| rdev_set_qos_map(rdev, dev, NULL); |
| cfg80211_sched_dfs_chan_update(rdev); |
| } |
| |
| return err; |
| } |