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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
Johannes Berg29cbe682010-12-03 09:20:44 +010021
22/*
23 * Minimum interval between two consecutive PREQs originated by the same
24 * interface
25 */
26#define MESH_PREQ_MIN_INT 10
Thomas Pedersendca7e942011-11-24 17:15:24 -080027#define MESH_PERR_MIN_INT 100
Johannes Berg29cbe682010-12-03 09:20:44 +010028#define MESH_DIAM_TRAVERSAL_TIME 50
29
Ashok Nagarajan55335132012-02-28 17:04:08 -080030#define MESH_RSSI_THRESHOLD 0
31
Johannes Berg29cbe682010-12-03 09:20:44 +010032/*
33 * A path will be refreshed if it is used PATH_REFRESH_TIME milliseconds
34 * before timing out. This way it will remain ACTIVE and no data frames
35 * will be unnecessarily held in the pending queue.
36 */
37#define MESH_PATH_REFRESH_TIME 1000
38#define MESH_MIN_DISCOVERY_TIMEOUT (2 * MESH_DIAM_TRAVERSAL_TIME)
39
40/* Default maximum number of established plinks per interface */
41#define MESH_MAX_ESTAB_PLINKS 32
42
43#define MESH_MAX_PREQ_RETRIES 4
44
Javier Cardonad299a1f2012-03-31 11:31:33 -070045#define MESH_SYNC_NEIGHBOR_OFFSET_MAX 50
Johannes Berg29cbe682010-12-03 09:20:44 +010046
47const struct mesh_config default_mesh_config = {
48 .dot11MeshRetryTimeout = MESH_RET_T,
49 .dot11MeshConfirmTimeout = MESH_CONF_T,
50 .dot11MeshHoldingTimeout = MESH_HOLD_T,
51 .dot11MeshMaxRetries = MESH_MAX_RETR,
52 .dot11MeshTTL = MESH_TTL,
53 .element_ttl = MESH_DEFAULT_ELEMENT_TTL,
54 .auto_open_plinks = true,
55 .dot11MeshMaxPeerLinks = MESH_MAX_ESTAB_PLINKS,
Javier Cardonad299a1f2012-03-31 11:31:33 -070056 .dot11MeshNbrOffsetMaxNeighbor = MESH_SYNC_NEIGHBOR_OFFSET_MAX,
Johannes Berg29cbe682010-12-03 09:20:44 +010057 .dot11MeshHWMPactivePathTimeout = MESH_PATH_TIMEOUT,
58 .dot11MeshHWMPpreqMinInterval = MESH_PREQ_MIN_INT,
Thomas Pedersendca7e942011-11-24 17:15:24 -080059 .dot11MeshHWMPperrMinInterval = MESH_PERR_MIN_INT,
Johannes Berg29cbe682010-12-03 09:20:44 +010060 .dot11MeshHWMPnetDiameterTraversalTime = MESH_DIAM_TRAVERSAL_TIME,
61 .dot11MeshHWMPmaxPREQretries = MESH_MAX_PREQ_RETRIES,
62 .path_refresh_time = MESH_PATH_REFRESH_TIME,
63 .min_discovery_timeout = MESH_MIN_DISCOVERY_TIMEOUT,
Javier Cardona0507e152011-08-09 16:45:10 -070064 .dot11MeshHWMPRannInterval = MESH_RANN_INTERVAL,
Javier Cardona16dd7262011-08-09 16:45:11 -070065 .dot11MeshGateAnnouncementProtocol = false,
Chun-Yeow Yeoh94f90652012-01-21 01:02:16 +080066 .dot11MeshForwarding = true,
Ashok Nagarajan55335132012-02-28 17:04:08 -080067 .rssi_threshold = MESH_RSSI_THRESHOLD,
Ashok Nagarajan70c33ea2012-04-30 14:20:32 -070068 .ht_opmode = IEEE80211_HT_OP_MODE_PROTECTION_NONHT_MIXED,
Chun-Yeow Yeohac1073a2012-06-14 02:06:06 +080069 .dot11MeshHWMPactivePathToRootTimeout = MESH_PATH_TO_ROOT_TIMEOUT,
70 .dot11MeshHWMProotInterval = MESH_ROOT_INTERVAL,
Chun-Yeow Yeoh728b19e2012-06-14 02:06:10 +080071 .dot11MeshHWMPconfirmationInterval = MESH_ROOT_CONFIRMATION_INTERVAL,
Johannes Berg29cbe682010-12-03 09:20:44 +010072};
73
Javier Cardonac80d5452010-12-16 17:37:49 -080074const struct mesh_setup default_mesh_setup = {
Johannes Bergcc1d2802012-05-16 23:50:20 +020075 /* cfg80211_join_mesh() will pick a channel if needed */
Javier Cardonad299a1f2012-03-31 11:31:33 -070076 .sync_method = IEEE80211_SYNC_METHOD_NEIGHBOR_OFFSET,
Javier Cardonac80d5452010-12-16 17:37:49 -080077 .path_sel_proto = IEEE80211_PATH_PROTOCOL_HWMP,
78 .path_metric = IEEE80211_PATH_METRIC_AIRTIME,
Javier Cardona581a8b02011-04-07 15:08:27 -070079 .ie = NULL,
80 .ie_len = 0,
Javier Cardona5cff5e02011-04-07 15:08:29 -070081 .is_secure = false,
Javier Cardonac80d5452010-12-16 17:37:49 -080082};
Johannes Berg29cbe682010-12-03 09:20:44 +010083
84int __cfg80211_join_mesh(struct cfg80211_registered_device *rdev,
85 struct net_device *dev,
Johannes Bergcc1d2802012-05-16 23:50:20 +020086 struct mesh_setup *setup,
Johannes Berg29cbe682010-12-03 09:20:44 +010087 const struct mesh_config *conf)
88{
89 struct wireless_dev *wdev = dev->ieee80211_ptr;
Johannes Berg29cbe682010-12-03 09:20:44 +010090 int err;
91
92 BUILD_BUG_ON(IEEE80211_MAX_SSID_LEN != IEEE80211_MAX_MESH_ID_LEN);
93
94 ASSERT_WDEV_LOCK(wdev);
95
96 if (dev->ieee80211_ptr->iftype != NL80211_IFTYPE_MESH_POINT)
97 return -EOPNOTSUPP;
98
Javier Cardona15d5dda2011-04-07 15:08:28 -070099 if (!(rdev->wiphy.flags & WIPHY_FLAG_MESH_AUTH) &&
100 setup->is_secure)
101 return -EOPNOTSUPP;
102
Johannes Berg29cbe682010-12-03 09:20:44 +0100103 if (wdev->mesh_id_len)
104 return -EALREADY;
105
Javier Cardonac80d5452010-12-16 17:37:49 -0800106 if (!setup->mesh_id_len)
Johannes Berg29cbe682010-12-03 09:20:44 +0100107 return -EINVAL;
108
109 if (!rdev->ops->join_mesh)
110 return -EOPNOTSUPP;
111
Johannes Berg683b6d32012-11-08 21:25:48 +0100112 if (!setup->chandef.chan) {
Johannes Bergcc1d2802012-05-16 23:50:20 +0200113 /* if no channel explicitly given, use preset channel */
Johannes Berg683b6d32012-11-08 21:25:48 +0100114 setup->chandef = wdev->preset_chandef;
Johannes Bergcc1d2802012-05-16 23:50:20 +0200115 }
116
Johannes Berg683b6d32012-11-08 21:25:48 +0100117 if (!setup->chandef.chan) {
Johannes Bergcc1d2802012-05-16 23:50:20 +0200118 /* if we don't have that either, use the first usable channel */
119 enum ieee80211_band band;
120
121 for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
122 struct ieee80211_supported_band *sband;
123 struct ieee80211_channel *chan;
124 int i;
125
126 sband = rdev->wiphy.bands[band];
127 if (!sband)
128 continue;
129
130 for (i = 0; i < sband->n_channels; i++) {
131 chan = &sband->channels[i];
132 if (chan->flags & (IEEE80211_CHAN_NO_IBSS |
133 IEEE80211_CHAN_PASSIVE_SCAN |
134 IEEE80211_CHAN_DISABLED |
135 IEEE80211_CHAN_RADAR))
136 continue;
Johannes Berg683b6d32012-11-08 21:25:48 +0100137 setup->chandef.chan = chan;
Johannes Bergcc1d2802012-05-16 23:50:20 +0200138 break;
139 }
140
Johannes Berg683b6d32012-11-08 21:25:48 +0100141 if (setup->chandef.chan)
Johannes Bergcc1d2802012-05-16 23:50:20 +0200142 break;
143 }
144
145 /* no usable channel ... */
Johannes Berg683b6d32012-11-08 21:25:48 +0100146 if (!setup->chandef.chan)
Johannes Bergcc1d2802012-05-16 23:50:20 +0200147 return -EINVAL;
148
Marco Porschda29d2a2012-12-03 11:23:37 +0100149 setup->chandef.width = NL80211_CHAN_WIDTH_20_NOHT;
150 setup->chandef.center_freq1 = setup->chandef.chan->center_freq;
Johannes Bergcc1d2802012-05-16 23:50:20 +0200151 }
152
Johannes Berg683b6d32012-11-08 21:25:48 +0100153 if (!cfg80211_reg_can_beacon(&rdev->wiphy, &setup->chandef))
Johannes Bergcc1d2802012-05-16 23:50:20 +0200154 return -EINVAL;
155
Johannes Berg683b6d32012-11-08 21:25:48 +0100156 err = cfg80211_can_use_chan(rdev, wdev, setup->chandef.chan,
Michal Kaziore4e32452012-06-29 12:47:08 +0200157 CHAN_MODE_SHARED);
158 if (err)
159 return err;
160
Hila Gonene35e4d22012-06-27 17:19:42 +0300161 err = rdev_join_mesh(rdev, dev, conf, setup);
Johannes Berg29cbe682010-12-03 09:20:44 +0100162 if (!err) {
Javier Cardonac80d5452010-12-16 17:37:49 -0800163 memcpy(wdev->ssid, setup->mesh_id, setup->mesh_id_len);
164 wdev->mesh_id_len = setup->mesh_id_len;
Johannes Berg683b6d32012-11-08 21:25:48 +0100165 wdev->channel = setup->chandef.chan;
Johannes Berg29cbe682010-12-03 09:20:44 +0100166 }
167
168 return err;
169}
170
171int cfg80211_join_mesh(struct cfg80211_registered_device *rdev,
172 struct net_device *dev,
Johannes Bergcc1d2802012-05-16 23:50:20 +0200173 struct mesh_setup *setup,
Johannes Berg29cbe682010-12-03 09:20:44 +0100174 const struct mesh_config *conf)
175{
176 struct wireless_dev *wdev = dev->ieee80211_ptr;
177 int err;
178
Michal Kaziore4e32452012-06-29 12:47:08 +0200179 mutex_lock(&rdev->devlist_mtx);
Johannes Berg29cbe682010-12-03 09:20:44 +0100180 wdev_lock(wdev);
Javier Cardonac80d5452010-12-16 17:37:49 -0800181 err = __cfg80211_join_mesh(rdev, dev, setup, conf);
Johannes Berg29cbe682010-12-03 09:20:44 +0100182 wdev_unlock(wdev);
Michal Kaziore4e32452012-06-29 12:47:08 +0200183 mutex_unlock(&rdev->devlist_mtx);
Johannes Berg29cbe682010-12-03 09:20:44 +0100184
185 return err;
186}
187
Johannes Berg683b6d32012-11-08 21:25:48 +0100188int cfg80211_set_mesh_channel(struct cfg80211_registered_device *rdev,
189 struct wireless_dev *wdev,
190 struct cfg80211_chan_def *chandef)
Johannes Bergcc1d2802012-05-16 23:50:20 +0200191{
Michal Kaziorf4489eb2012-06-29 12:46:58 +0200192 int err;
Johannes Bergcc1d2802012-05-16 23:50:20 +0200193
194 /*
195 * Workaround for libertas (only!), it puts the interface
196 * into mesh mode but doesn't implement join_mesh. Instead,
197 * it is configured via sysfs and then joins the mesh when
198 * you set the channel. Note that the libertas mesh isn't
199 * compatible with 802.11 mesh.
200 */
Johannes Berge8c9bd52012-06-06 08:18:22 +0200201 if (rdev->ops->libertas_set_mesh_channel) {
Johannes Berg3d9d1d62012-11-08 23:14:50 +0100202 if (chandef->width != NL80211_CHAN_WIDTH_20_NOHT)
Johannes Berge8c9bd52012-06-06 08:18:22 +0200203 return -EINVAL;
Johannes Bergcc1d2802012-05-16 23:50:20 +0200204
205 if (!netif_running(wdev->netdev))
206 return -ENETDOWN;
Michal Kaziorf4489eb2012-06-29 12:46:58 +0200207
Johannes Berg683b6d32012-11-08 21:25:48 +0100208 err = cfg80211_can_use_chan(rdev, wdev, chandef->chan,
Michal Kaziore4e32452012-06-29 12:47:08 +0200209 CHAN_MODE_SHARED);
210 if (err)
211 return err;
212
Hila Gonene35e4d22012-06-27 17:19:42 +0300213 err = rdev_libertas_set_mesh_channel(rdev, wdev->netdev,
Johannes Berg683b6d32012-11-08 21:25:48 +0100214 chandef->chan);
Michal Kaziorf4489eb2012-06-29 12:46:58 +0200215 if (!err)
Johannes Berg683b6d32012-11-08 21:25:48 +0100216 wdev->channel = chandef->chan;
Michal Kaziorf4489eb2012-06-29 12:46:58 +0200217
218 return err;
Johannes Bergcc1d2802012-05-16 23:50:20 +0200219 }
220
221 if (wdev->mesh_id_len)
222 return -EBUSY;
223
Johannes Berg683b6d32012-11-08 21:25:48 +0100224 wdev->preset_chandef = *chandef;
Johannes Bergcc1d2802012-05-16 23:50:20 +0200225 return 0;
226}
227
Javier Cardonac93b5e72011-04-07 15:08:34 -0700228void cfg80211_notify_new_peer_candidate(struct net_device *dev,
229 const u8 *macaddr, const u8* ie, u8 ie_len, gfp_t gfp)
230{
231 struct wireless_dev *wdev = dev->ieee80211_ptr;
232
Beni Lev4ee3e062012-08-27 12:49:39 +0300233 trace_cfg80211_notify_new_peer_candidate(dev, macaddr);
Javier Cardonac93b5e72011-04-07 15:08:34 -0700234 if (WARN_ON(wdev->iftype != NL80211_IFTYPE_MESH_POINT))
235 return;
236
237 nl80211_send_new_peer_candidate(wiphy_to_dev(wdev->wiphy), dev,
238 macaddr, ie, ie_len, gfp);
239}
240EXPORT_SYMBOL(cfg80211_notify_new_peer_candidate);
241
Johannes Berg29cbe682010-12-03 09:20:44 +0100242static int __cfg80211_leave_mesh(struct cfg80211_registered_device *rdev,
243 struct net_device *dev)
244{
245 struct wireless_dev *wdev = dev->ieee80211_ptr;
246 int err;
247
248 ASSERT_WDEV_LOCK(wdev);
249
250 if (dev->ieee80211_ptr->iftype != NL80211_IFTYPE_MESH_POINT)
251 return -EOPNOTSUPP;
252
253 if (!rdev->ops->leave_mesh)
254 return -EOPNOTSUPP;
255
256 if (!wdev->mesh_id_len)
257 return -ENOTCONN;
258
Hila Gonene35e4d22012-06-27 17:19:42 +0300259 err = rdev_leave_mesh(rdev, dev);
Michal Kaziorf4489eb2012-06-29 12:46:58 +0200260 if (!err) {
Johannes Berg29cbe682010-12-03 09:20:44 +0100261 wdev->mesh_id_len = 0;
Michal Kaziorf4489eb2012-06-29 12:46:58 +0200262 wdev->channel = NULL;
263 }
264
Johannes Berg29cbe682010-12-03 09:20:44 +0100265 return err;
266}
267
268int cfg80211_leave_mesh(struct cfg80211_registered_device *rdev,
269 struct net_device *dev)
270{
271 struct wireless_dev *wdev = dev->ieee80211_ptr;
272 int err;
273
274 wdev_lock(wdev);
275 err = __cfg80211_leave_mesh(rdev, dev);
276 wdev_unlock(wdev);
277
278 return err;
279}