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Johannes Berg29cbe682010-12-03 09:20:44 +01001#include <linux/ieee80211.h>
Paul Gortmakerbc3b2d72011-07-15 11:47:34 -04002#include <linux/export.h>
Johannes Berg29cbe682010-12-03 09:20:44 +01003#include <net/cfg80211.h>
Javier Cardonac93b5e72011-04-07 15:08:34 -07004#include "nl80211.h"
Johannes Berg29cbe682010-12-03 09:20:44 +01005#include "core.h"
Hila Gonene35e4d22012-06-27 17:19:42 +03006#include "rdev-ops.h"
Johannes Berg29cbe682010-12-03 09:20:44 +01007
8/* Default values, timeouts in ms */
9#define MESH_TTL 31
10#define MESH_DEFAULT_ELEMENT_TTL 31
11#define MESH_MAX_RETR 3
12#define MESH_RET_T 100
13#define MESH_CONF_T 100
14#define MESH_HOLD_T 100
15
16#define MESH_PATH_TIMEOUT 5000
Javier Cardona0507e152011-08-09 16:45:10 -070017#define MESH_RANN_INTERVAL 5000
Chun-Yeow Yeohac1073a2012-06-14 02:06:06 +080018#define MESH_PATH_TO_ROOT_TIMEOUT 6000
19#define MESH_ROOT_INTERVAL 5000
Chun-Yeow Yeoh728b19e2012-06-14 02:06:10 +080020#define MESH_ROOT_CONFIRMATION_INTERVAL 2000
Colleen Twitty8e7c0532013-06-03 09:53:39 -070021#define MESH_DEFAULT_PLINK_TIMEOUT 1800 /* timeout in seconds */
Johannes Berg29cbe682010-12-03 09:20:44 +010022
23/*
24 * Minimum interval between two consecutive PREQs originated by the same
25 * interface
26 */
27#define MESH_PREQ_MIN_INT 10
Thomas Pedersendca7e942011-11-24 17:15:24 -080028#define MESH_PERR_MIN_INT 100
Johannes Berg29cbe682010-12-03 09:20:44 +010029#define MESH_DIAM_TRAVERSAL_TIME 50
30
Ashok Nagarajan55335132012-02-28 17:04:08 -080031#define MESH_RSSI_THRESHOLD 0
32
Johannes Berg29cbe682010-12-03 09:20:44 +010033/*
34 * A path will be refreshed if it is used PATH_REFRESH_TIME milliseconds
35 * before timing out. This way it will remain ACTIVE and no data frames
36 * will be unnecessarily held in the pending queue.
37 */
38#define MESH_PATH_REFRESH_TIME 1000
39#define MESH_MIN_DISCOVERY_TIMEOUT (2 * MESH_DIAM_TRAVERSAL_TIME)
40
41/* Default maximum number of established plinks per interface */
42#define MESH_MAX_ESTAB_PLINKS 32
43
44#define MESH_MAX_PREQ_RETRIES 4
45
Javier Cardonad299a1f2012-03-31 11:31:33 -070046#define MESH_SYNC_NEIGHBOR_OFFSET_MAX 50
Johannes Berg29cbe682010-12-03 09:20:44 +010047
Marco Porsch9bdbf042013-01-07 16:04:51 +010048#define MESH_DEFAULT_BEACON_INTERVAL 1000 /* in 1024 us units (=TUs) */
49#define MESH_DEFAULT_DTIM_PERIOD 2
Marco Porsch3b1c5a52013-01-07 16:04:52 +010050#define MESH_DEFAULT_AWAKE_WINDOW 10 /* in 1024 us units (=TUs) */
Marco Porsch9bdbf042013-01-07 16:04:51 +010051
Johannes Berg29cbe682010-12-03 09:20:44 +010052const struct mesh_config default_mesh_config = {
53 .dot11MeshRetryTimeout = MESH_RET_T,
54 .dot11MeshConfirmTimeout = MESH_CONF_T,
55 .dot11MeshHoldingTimeout = MESH_HOLD_T,
56 .dot11MeshMaxRetries = MESH_MAX_RETR,
57 .dot11MeshTTL = MESH_TTL,
58 .element_ttl = MESH_DEFAULT_ELEMENT_TTL,
59 .auto_open_plinks = true,
60 .dot11MeshMaxPeerLinks = MESH_MAX_ESTAB_PLINKS,
Javier Cardonad299a1f2012-03-31 11:31:33 -070061 .dot11MeshNbrOffsetMaxNeighbor = MESH_SYNC_NEIGHBOR_OFFSET_MAX,
Johannes Berg29cbe682010-12-03 09:20:44 +010062 .dot11MeshHWMPactivePathTimeout = MESH_PATH_TIMEOUT,
63 .dot11MeshHWMPpreqMinInterval = MESH_PREQ_MIN_INT,
Thomas Pedersendca7e942011-11-24 17:15:24 -080064 .dot11MeshHWMPperrMinInterval = MESH_PERR_MIN_INT,
Johannes Berg29cbe682010-12-03 09:20:44 +010065 .dot11MeshHWMPnetDiameterTraversalTime = MESH_DIAM_TRAVERSAL_TIME,
66 .dot11MeshHWMPmaxPREQretries = MESH_MAX_PREQ_RETRIES,
67 .path_refresh_time = MESH_PATH_REFRESH_TIME,
68 .min_discovery_timeout = MESH_MIN_DISCOVERY_TIMEOUT,
Javier Cardona0507e152011-08-09 16:45:10 -070069 .dot11MeshHWMPRannInterval = MESH_RANN_INTERVAL,
Javier Cardona16dd7262011-08-09 16:45:11 -070070 .dot11MeshGateAnnouncementProtocol = false,
Chun-Yeow Yeoh94f90652012-01-21 01:02:16 +080071 .dot11MeshForwarding = true,
Ashok Nagarajan55335132012-02-28 17:04:08 -080072 .rssi_threshold = MESH_RSSI_THRESHOLD,
Ashok Nagarajan70c33ea2012-04-30 14:20:32 -070073 .ht_opmode = IEEE80211_HT_OP_MODE_PROTECTION_NONHT_MIXED,
Chun-Yeow Yeohac1073a2012-06-14 02:06:06 +080074 .dot11MeshHWMPactivePathToRootTimeout = MESH_PATH_TO_ROOT_TIMEOUT,
75 .dot11MeshHWMProotInterval = MESH_ROOT_INTERVAL,
Chun-Yeow Yeoh728b19e2012-06-14 02:06:10 +080076 .dot11MeshHWMPconfirmationInterval = MESH_ROOT_CONFIRMATION_INTERVAL,
Marco Porsch3b1c5a52013-01-07 16:04:52 +010077 .power_mode = NL80211_MESH_POWER_ACTIVE,
78 .dot11MeshAwakeWindowDuration = MESH_DEFAULT_AWAKE_WINDOW,
Colleen Twitty8e7c0532013-06-03 09:53:39 -070079 .plink_timeout = MESH_DEFAULT_PLINK_TIMEOUT,
Johannes Berg29cbe682010-12-03 09:20:44 +010080};
81
Javier Cardonac80d5452010-12-16 17:37:49 -080082const struct mesh_setup default_mesh_setup = {
Johannes Bergcc1d2802012-05-16 23:50:20 +020083 /* cfg80211_join_mesh() will pick a channel if needed */
Javier Cardonad299a1f2012-03-31 11:31:33 -070084 .sync_method = IEEE80211_SYNC_METHOD_NEIGHBOR_OFFSET,
Javier Cardonac80d5452010-12-16 17:37:49 -080085 .path_sel_proto = IEEE80211_PATH_PROTOCOL_HWMP,
86 .path_metric = IEEE80211_PATH_METRIC_AIRTIME,
Colleen Twitty6e16d902013-05-08 11:45:59 -070087 .auth_id = 0, /* open */
Javier Cardona581a8b02011-04-07 15:08:27 -070088 .ie = NULL,
89 .ie_len = 0,
Javier Cardona5cff5e02011-04-07 15:08:29 -070090 .is_secure = false,
Thomas Pedersenbb2798d2013-03-04 13:06:10 -080091 .user_mpm = false,
Marco Porsch9bdbf042013-01-07 16:04:51 +010092 .beacon_interval = MESH_DEFAULT_BEACON_INTERVAL,
93 .dtim_period = MESH_DEFAULT_DTIM_PERIOD,
Javier Cardonac80d5452010-12-16 17:37:49 -080094};
Johannes Berg29cbe682010-12-03 09:20:44 +010095
96int __cfg80211_join_mesh(struct cfg80211_registered_device *rdev,
97 struct net_device *dev,
Johannes Bergcc1d2802012-05-16 23:50:20 +020098 struct mesh_setup *setup,
Johannes Berg29cbe682010-12-03 09:20:44 +010099 const struct mesh_config *conf)
100{
101 struct wireless_dev *wdev = dev->ieee80211_ptr;
Chun-Yeow Yeoh33dde2b2013-12-02 16:05:49 +0800102 u8 radar_detect_width = 0;
Johannes Berg29cbe682010-12-03 09:20:44 +0100103 int err;
104
105 BUILD_BUG_ON(IEEE80211_MAX_SSID_LEN != IEEE80211_MAX_MESH_ID_LEN);
106
107 ASSERT_WDEV_LOCK(wdev);
108
109 if (dev->ieee80211_ptr->iftype != NL80211_IFTYPE_MESH_POINT)
110 return -EOPNOTSUPP;
111
Javier Cardona15d5dda2011-04-07 15:08:28 -0700112 if (!(rdev->wiphy.flags & WIPHY_FLAG_MESH_AUTH) &&
113 setup->is_secure)
114 return -EOPNOTSUPP;
115
Johannes Berg29cbe682010-12-03 09:20:44 +0100116 if (wdev->mesh_id_len)
117 return -EALREADY;
118
Javier Cardonac80d5452010-12-16 17:37:49 -0800119 if (!setup->mesh_id_len)
Johannes Berg29cbe682010-12-03 09:20:44 +0100120 return -EINVAL;
121
122 if (!rdev->ops->join_mesh)
123 return -EOPNOTSUPP;
124
Johannes Berg683b6d32012-11-08 21:25:48 +0100125 if (!setup->chandef.chan) {
Johannes Bergcc1d2802012-05-16 23:50:20 +0200126 /* if no channel explicitly given, use preset channel */
Johannes Berg683b6d32012-11-08 21:25:48 +0100127 setup->chandef = wdev->preset_chandef;
Johannes Bergcc1d2802012-05-16 23:50:20 +0200128 }
129
Johannes Berg683b6d32012-11-08 21:25:48 +0100130 if (!setup->chandef.chan) {
Johannes Bergcc1d2802012-05-16 23:50:20 +0200131 /* if we don't have that either, use the first usable channel */
132 enum ieee80211_band band;
133
134 for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
135 struct ieee80211_supported_band *sband;
136 struct ieee80211_channel *chan;
137 int i;
138
139 sband = rdev->wiphy.bands[band];
140 if (!sband)
141 continue;
142
143 for (i = 0; i < sband->n_channels; i++) {
144 chan = &sband->channels[i];
Luis R. Rodriguez8fe02e12013-10-21 19:22:25 +0200145 if (chan->flags & (IEEE80211_CHAN_NO_IR |
Johannes Bergcc1d2802012-05-16 23:50:20 +0200146 IEEE80211_CHAN_DISABLED |
147 IEEE80211_CHAN_RADAR))
148 continue;
Johannes Berg683b6d32012-11-08 21:25:48 +0100149 setup->chandef.chan = chan;
Johannes Bergcc1d2802012-05-16 23:50:20 +0200150 break;
151 }
152
Johannes Berg683b6d32012-11-08 21:25:48 +0100153 if (setup->chandef.chan)
Johannes Bergcc1d2802012-05-16 23:50:20 +0200154 break;
155 }
156
157 /* no usable channel ... */
Johannes Berg683b6d32012-11-08 21:25:48 +0100158 if (!setup->chandef.chan)
Johannes Bergcc1d2802012-05-16 23:50:20 +0200159 return -EINVAL;
160
Marco Porschda29d2a2012-12-03 11:23:37 +0100161 setup->chandef.width = NL80211_CHAN_WIDTH_20_NOHT;
162 setup->chandef.center_freq1 = setup->chandef.chan->center_freq;
Johannes Bergcc1d2802012-05-16 23:50:20 +0200163 }
164
Ashok Nagarajanffb3cf32013-06-03 10:33:36 -0700165 /*
166 * check if basic rates are available otherwise use mandatory rates as
167 * basic rates
168 */
169 if (!setup->basic_rates) {
Simon Wunderlich74608ac2013-07-08 16:55:54 +0200170 enum nl80211_bss_scan_width scan_width;
Ashok Nagarajanffb3cf32013-06-03 10:33:36 -0700171 struct ieee80211_supported_band *sband =
172 rdev->wiphy.bands[setup->chandef.chan->band];
Simon Wunderlich74608ac2013-07-08 16:55:54 +0200173 scan_width = cfg80211_chandef_to_scan_width(&setup->chandef);
174 setup->basic_rates = ieee80211_mandatory_rates(sband,
175 scan_width);
Ashok Nagarajanffb3cf32013-06-03 10:33:36 -0700176 }
177
Johannes Berg683b6d32012-11-08 21:25:48 +0100178 if (!cfg80211_reg_can_beacon(&rdev->wiphy, &setup->chandef))
Johannes Bergcc1d2802012-05-16 23:50:20 +0200179 return -EINVAL;
180
Chun-Yeow Yeoh33dde2b2013-12-02 16:05:49 +0800181 err = cfg80211_chandef_dfs_required(wdev->wiphy, &setup->chandef);
182 if (err < 0)
183 return err;
184 if (err)
185 radar_detect_width = BIT(setup->chandef.width);
186
187 err = cfg80211_can_use_iftype_chan(rdev, wdev, wdev->iftype,
188 setup->chandef.chan,
189 CHAN_MODE_SHARED,
190 radar_detect_width);
Michal Kaziore4e32452012-06-29 12:47:08 +0200191 if (err)
192 return err;
193
Hila Gonene35e4d22012-06-27 17:19:42 +0300194 err = rdev_join_mesh(rdev, dev, conf, setup);
Johannes Berg29cbe682010-12-03 09:20:44 +0100195 if (!err) {
Javier Cardonac80d5452010-12-16 17:37:49 -0800196 memcpy(wdev->ssid, setup->mesh_id, setup->mesh_id_len);
197 wdev->mesh_id_len = setup->mesh_id_len;
Johannes Berg683b6d32012-11-08 21:25:48 +0100198 wdev->channel = setup->chandef.chan;
Johannes Berg29cbe682010-12-03 09:20:44 +0100199 }
200
201 return err;
202}
203
204int cfg80211_join_mesh(struct cfg80211_registered_device *rdev,
205 struct net_device *dev,
Johannes Bergcc1d2802012-05-16 23:50:20 +0200206 struct mesh_setup *setup,
Johannes Berg29cbe682010-12-03 09:20:44 +0100207 const struct mesh_config *conf)
208{
209 struct wireless_dev *wdev = dev->ieee80211_ptr;
210 int err;
211
212 wdev_lock(wdev);
Javier Cardonac80d5452010-12-16 17:37:49 -0800213 err = __cfg80211_join_mesh(rdev, dev, setup, conf);
Johannes Berg29cbe682010-12-03 09:20:44 +0100214 wdev_unlock(wdev);
215
216 return err;
217}
218
Johannes Berg683b6d32012-11-08 21:25:48 +0100219int cfg80211_set_mesh_channel(struct cfg80211_registered_device *rdev,
220 struct wireless_dev *wdev,
221 struct cfg80211_chan_def *chandef)
Johannes Bergcc1d2802012-05-16 23:50:20 +0200222{
Michal Kaziorf4489eb2012-06-29 12:46:58 +0200223 int err;
Johannes Bergcc1d2802012-05-16 23:50:20 +0200224
225 /*
226 * Workaround for libertas (only!), it puts the interface
227 * into mesh mode but doesn't implement join_mesh. Instead,
228 * it is configured via sysfs and then joins the mesh when
229 * you set the channel. Note that the libertas mesh isn't
230 * compatible with 802.11 mesh.
231 */
Johannes Berge8c9bd52012-06-06 08:18:22 +0200232 if (rdev->ops->libertas_set_mesh_channel) {
Johannes Berg3d9d1d62012-11-08 23:14:50 +0100233 if (chandef->width != NL80211_CHAN_WIDTH_20_NOHT)
Johannes Berge8c9bd52012-06-06 08:18:22 +0200234 return -EINVAL;
Johannes Bergcc1d2802012-05-16 23:50:20 +0200235
236 if (!netif_running(wdev->netdev))
237 return -ENETDOWN;
Michal Kaziorf4489eb2012-06-29 12:46:58 +0200238
Johannes Berg683b6d32012-11-08 21:25:48 +0100239 err = cfg80211_can_use_chan(rdev, wdev, chandef->chan,
Michal Kaziore4e32452012-06-29 12:47:08 +0200240 CHAN_MODE_SHARED);
241 if (err)
242 return err;
243
Hila Gonene35e4d22012-06-27 17:19:42 +0300244 err = rdev_libertas_set_mesh_channel(rdev, wdev->netdev,
Johannes Berg683b6d32012-11-08 21:25:48 +0100245 chandef->chan);
Michal Kaziorf4489eb2012-06-29 12:46:58 +0200246 if (!err)
Johannes Berg683b6d32012-11-08 21:25:48 +0100247 wdev->channel = chandef->chan;
Michal Kaziorf4489eb2012-06-29 12:46:58 +0200248
249 return err;
Johannes Bergcc1d2802012-05-16 23:50:20 +0200250 }
251
252 if (wdev->mesh_id_len)
253 return -EBUSY;
254
Johannes Berg683b6d32012-11-08 21:25:48 +0100255 wdev->preset_chandef = *chandef;
Johannes Bergcc1d2802012-05-16 23:50:20 +0200256 return 0;
257}
258
Johannes Berg29cbe682010-12-03 09:20:44 +0100259static int __cfg80211_leave_mesh(struct cfg80211_registered_device *rdev,
260 struct net_device *dev)
261{
262 struct wireless_dev *wdev = dev->ieee80211_ptr;
263 int err;
264
265 ASSERT_WDEV_LOCK(wdev);
266
267 if (dev->ieee80211_ptr->iftype != NL80211_IFTYPE_MESH_POINT)
268 return -EOPNOTSUPP;
269
270 if (!rdev->ops->leave_mesh)
271 return -EOPNOTSUPP;
272
273 if (!wdev->mesh_id_len)
274 return -ENOTCONN;
275
Hila Gonene35e4d22012-06-27 17:19:42 +0300276 err = rdev_leave_mesh(rdev, dev);
Michal Kaziorf4489eb2012-06-29 12:46:58 +0200277 if (!err) {
Johannes Berg29cbe682010-12-03 09:20:44 +0100278 wdev->mesh_id_len = 0;
Michal Kaziorf4489eb2012-06-29 12:46:58 +0200279 wdev->channel = NULL;
Kyeyoon Parkfa9ffc72013-12-16 23:01:30 -0800280 rdev_set_qos_map(rdev, dev, NULL);
Michal Kaziorf4489eb2012-06-29 12:46:58 +0200281 }
282
Johannes Berg29cbe682010-12-03 09:20:44 +0100283 return err;
284}
285
286int cfg80211_leave_mesh(struct cfg80211_registered_device *rdev,
287 struct net_device *dev)
288{
289 struct wireless_dev *wdev = dev->ieee80211_ptr;
290 int err;
291
292 wdev_lock(wdev);
293 err = __cfg80211_leave_mesh(rdev, dev);
294 wdev_unlock(wdev);
295
296 return err;
297}