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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;
Johannes Berg29cbe682010-12-03 09:20:44 +0100102 int err;
103
104 BUILD_BUG_ON(IEEE80211_MAX_SSID_LEN != IEEE80211_MAX_MESH_ID_LEN);
105
106 ASSERT_WDEV_LOCK(wdev);
107
108 if (dev->ieee80211_ptr->iftype != NL80211_IFTYPE_MESH_POINT)
109 return -EOPNOTSUPP;
110
Javier Cardona15d5dda2011-04-07 15:08:28 -0700111 if (!(rdev->wiphy.flags & WIPHY_FLAG_MESH_AUTH) &&
112 setup->is_secure)
113 return -EOPNOTSUPP;
114
Johannes Berg29cbe682010-12-03 09:20:44 +0100115 if (wdev->mesh_id_len)
116 return -EALREADY;
117
Javier Cardonac80d5452010-12-16 17:37:49 -0800118 if (!setup->mesh_id_len)
Johannes Berg29cbe682010-12-03 09:20:44 +0100119 return -EINVAL;
120
121 if (!rdev->ops->join_mesh)
122 return -EOPNOTSUPP;
123
Johannes Berg683b6d32012-11-08 21:25:48 +0100124 if (!setup->chandef.chan) {
Johannes Bergcc1d2802012-05-16 23:50:20 +0200125 /* if no channel explicitly given, use preset channel */
Johannes Berg683b6d32012-11-08 21:25:48 +0100126 setup->chandef = wdev->preset_chandef;
Johannes Bergcc1d2802012-05-16 23:50:20 +0200127 }
128
Johannes Berg683b6d32012-11-08 21:25:48 +0100129 if (!setup->chandef.chan) {
Johannes Bergcc1d2802012-05-16 23:50:20 +0200130 /* if we don't have that either, use the first usable channel */
131 enum ieee80211_band band;
132
133 for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
134 struct ieee80211_supported_band *sband;
135 struct ieee80211_channel *chan;
136 int i;
137
138 sband = rdev->wiphy.bands[band];
139 if (!sband)
140 continue;
141
142 for (i = 0; i < sband->n_channels; i++) {
143 chan = &sband->channels[i];
144 if (chan->flags & (IEEE80211_CHAN_NO_IBSS |
145 IEEE80211_CHAN_PASSIVE_SCAN |
146 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) {
170 struct ieee80211_supported_band *sband =
171 rdev->wiphy.bands[setup->chandef.chan->band];
172 setup->basic_rates = ieee80211_mandatory_rates(sband);
173 }
174
Johannes Berg683b6d32012-11-08 21:25:48 +0100175 if (!cfg80211_reg_can_beacon(&rdev->wiphy, &setup->chandef))
Johannes Bergcc1d2802012-05-16 23:50:20 +0200176 return -EINVAL;
177
Johannes Berg683b6d32012-11-08 21:25:48 +0100178 err = cfg80211_can_use_chan(rdev, wdev, setup->chandef.chan,
Michal Kaziore4e32452012-06-29 12:47:08 +0200179 CHAN_MODE_SHARED);
180 if (err)
181 return err;
182
Hila Gonene35e4d22012-06-27 17:19:42 +0300183 err = rdev_join_mesh(rdev, dev, conf, setup);
Johannes Berg29cbe682010-12-03 09:20:44 +0100184 if (!err) {
Javier Cardonac80d5452010-12-16 17:37:49 -0800185 memcpy(wdev->ssid, setup->mesh_id, setup->mesh_id_len);
186 wdev->mesh_id_len = setup->mesh_id_len;
Johannes Berg683b6d32012-11-08 21:25:48 +0100187 wdev->channel = setup->chandef.chan;
Johannes Berg29cbe682010-12-03 09:20:44 +0100188 }
189
190 return err;
191}
192
193int cfg80211_join_mesh(struct cfg80211_registered_device *rdev,
194 struct net_device *dev,
Johannes Bergcc1d2802012-05-16 23:50:20 +0200195 struct mesh_setup *setup,
Johannes Berg29cbe682010-12-03 09:20:44 +0100196 const struct mesh_config *conf)
197{
198 struct wireless_dev *wdev = dev->ieee80211_ptr;
199 int err;
200
201 wdev_lock(wdev);
Javier Cardonac80d5452010-12-16 17:37:49 -0800202 err = __cfg80211_join_mesh(rdev, dev, setup, conf);
Johannes Berg29cbe682010-12-03 09:20:44 +0100203 wdev_unlock(wdev);
204
205 return err;
206}
207
Johannes Berg683b6d32012-11-08 21:25:48 +0100208int cfg80211_set_mesh_channel(struct cfg80211_registered_device *rdev,
209 struct wireless_dev *wdev,
210 struct cfg80211_chan_def *chandef)
Johannes Bergcc1d2802012-05-16 23:50:20 +0200211{
Michal Kaziorf4489eb2012-06-29 12:46:58 +0200212 int err;
Johannes Bergcc1d2802012-05-16 23:50:20 +0200213
214 /*
215 * Workaround for libertas (only!), it puts the interface
216 * into mesh mode but doesn't implement join_mesh. Instead,
217 * it is configured via sysfs and then joins the mesh when
218 * you set the channel. Note that the libertas mesh isn't
219 * compatible with 802.11 mesh.
220 */
Johannes Berge8c9bd52012-06-06 08:18:22 +0200221 if (rdev->ops->libertas_set_mesh_channel) {
Johannes Berg3d9d1d62012-11-08 23:14:50 +0100222 if (chandef->width != NL80211_CHAN_WIDTH_20_NOHT)
Johannes Berge8c9bd52012-06-06 08:18:22 +0200223 return -EINVAL;
Johannes Bergcc1d2802012-05-16 23:50:20 +0200224
225 if (!netif_running(wdev->netdev))
226 return -ENETDOWN;
Michal Kaziorf4489eb2012-06-29 12:46:58 +0200227
Johannes Berg683b6d32012-11-08 21:25:48 +0100228 err = cfg80211_can_use_chan(rdev, wdev, chandef->chan,
Michal Kaziore4e32452012-06-29 12:47:08 +0200229 CHAN_MODE_SHARED);
230 if (err)
231 return err;
232
Hila Gonene35e4d22012-06-27 17:19:42 +0300233 err = rdev_libertas_set_mesh_channel(rdev, wdev->netdev,
Johannes Berg683b6d32012-11-08 21:25:48 +0100234 chandef->chan);
Michal Kaziorf4489eb2012-06-29 12:46:58 +0200235 if (!err)
Johannes Berg683b6d32012-11-08 21:25:48 +0100236 wdev->channel = chandef->chan;
Michal Kaziorf4489eb2012-06-29 12:46:58 +0200237
238 return err;
Johannes Bergcc1d2802012-05-16 23:50:20 +0200239 }
240
241 if (wdev->mesh_id_len)
242 return -EBUSY;
243
Johannes Berg683b6d32012-11-08 21:25:48 +0100244 wdev->preset_chandef = *chandef;
Johannes Bergcc1d2802012-05-16 23:50:20 +0200245 return 0;
246}
247
Johannes Berg29cbe682010-12-03 09:20:44 +0100248static int __cfg80211_leave_mesh(struct cfg80211_registered_device *rdev,
249 struct net_device *dev)
250{
251 struct wireless_dev *wdev = dev->ieee80211_ptr;
252 int err;
253
254 ASSERT_WDEV_LOCK(wdev);
255
256 if (dev->ieee80211_ptr->iftype != NL80211_IFTYPE_MESH_POINT)
257 return -EOPNOTSUPP;
258
259 if (!rdev->ops->leave_mesh)
260 return -EOPNOTSUPP;
261
262 if (!wdev->mesh_id_len)
263 return -ENOTCONN;
264
Hila Gonene35e4d22012-06-27 17:19:42 +0300265 err = rdev_leave_mesh(rdev, dev);
Michal Kaziorf4489eb2012-06-29 12:46:58 +0200266 if (!err) {
Johannes Berg29cbe682010-12-03 09:20:44 +0100267 wdev->mesh_id_len = 0;
Michal Kaziorf4489eb2012-06-29 12:46:58 +0200268 wdev->channel = NULL;
269 }
270
Johannes Berg29cbe682010-12-03 09:20:44 +0100271 return err;
272}
273
274int cfg80211_leave_mesh(struct cfg80211_registered_device *rdev,
275 struct net_device *dev)
276{
277 struct wireless_dev *wdev = dev->ieee80211_ptr;
278 int err;
279
280 wdev_lock(wdev);
281 err = __cfg80211_leave_mesh(rdev, dev);
282 wdev_unlock(wdev);
283
284 return err;
285}