1 #include <linux/ieee80211.h>
2 #include <linux/export.h>
3 #include <net/cfg80211.h>
4 #include "nl80211.h"
5 #include "core.h"
6 #include "rdev-ops.h"
7
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
17 #define MESH_RANN_INTERVAL 5000
18 #define MESH_PATH_TO_ROOT_TIMEOUT 6000
19 #define MESH_ROOT_INTERVAL 5000
20 #define MESH_ROOT_CONFIRMATION_INTERVAL 2000
21
22 /*
23 * Minimum interval between two consecutive PREQs originated by the same
24 * interface
25 */
26 #define MESH_PREQ_MIN_INT 10
27 #define MESH_PERR_MIN_INT 100
28 #define MESH_DIAM_TRAVERSAL_TIME 50
29
30 #define MESH_RSSI_THRESHOLD 0
31
32 /*
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
45 #define MESH_SYNC_NEIGHBOR_OFFSET_MAX 50
46
47 #define MESH_DEFAULT_BEACON_INTERVAL 1000 /* in 1024 us units (=TUs) */
48 #define MESH_DEFAULT_DTIM_PERIOD 2
49 #define MESH_DEFAULT_AWAKE_WINDOW 10 /* in 1024 us units (=TUs) */
50
51 const struct mesh_config default_mesh_config = {
52 .dot11MeshRetryTimeout = MESH_RET_T,
53 .dot11MeshConfirmTimeout = MESH_CONF_T,
54 .dot11MeshHoldingTimeout = MESH_HOLD_T,
55 .dot11MeshMaxRetries = MESH_MAX_RETR,
56 .dot11MeshTTL = MESH_TTL,
57 .element_ttl = MESH_DEFAULT_ELEMENT_TTL,
58 .auto_open_plinks = true,
59 .dot11MeshMaxPeerLinks = MESH_MAX_ESTAB_PLINKS,
60 .dot11MeshNbrOffsetMaxNeighbor = MESH_SYNC_NEIGHBOR_OFFSET_MAX,
61 .dot11MeshHWMPactivePathTimeout = MESH_PATH_TIMEOUT,
62 .dot11MeshHWMPpreqMinInterval = MESH_PREQ_MIN_INT,
63 .dot11MeshHWMPperrMinInterval = MESH_PERR_MIN_INT,
64 .dot11MeshHWMPnetDiameterTraversalTime = MESH_DIAM_TRAVERSAL_TIME,
65 .dot11MeshHWMPmaxPREQretries = MESH_MAX_PREQ_RETRIES,
66 .path_refresh_time = MESH_PATH_REFRESH_TIME,
67 .min_discovery_timeout = MESH_MIN_DISCOVERY_TIMEOUT,
68 .dot11MeshHWMPRannInterval = MESH_RANN_INTERVAL,
69 .dot11MeshGateAnnouncementProtocol = false,
70 .dot11MeshForwarding = true,
71 .rssi_threshold = MESH_RSSI_THRESHOLD,
72 .ht_opmode = IEEE80211_HT_OP_MODE_PROTECTION_NONHT_MIXED,
73 .dot11MeshHWMPactivePathToRootTimeout = MESH_PATH_TO_ROOT_TIMEOUT,
74 .dot11MeshHWMProotInterval = MESH_ROOT_INTERVAL,
75 .dot11MeshHWMPconfirmationInterval = MESH_ROOT_CONFIRMATION_INTERVAL,
76 .power_mode = NL80211_MESH_POWER_ACTIVE,
77 .dot11MeshAwakeWindowDuration = MESH_DEFAULT_AWAKE_WINDOW,
78 };
79
80 const struct mesh_setup default_mesh_setup = {
81 /* cfg80211_join_mesh() will pick a channel if needed */
82 .sync_method = IEEE80211_SYNC_METHOD_NEIGHBOR_OFFSET,
83 .path_sel_proto = IEEE80211_PATH_PROTOCOL_HWMP,
84 .path_metric = IEEE80211_PATH_METRIC_AIRTIME,
85 .ie = NULL,
86 .ie_len = 0,
87 .is_secure = false,
88 .user_mpm = false,
89 .beacon_interval = MESH_DEFAULT_BEACON_INTERVAL,
90 .dtim_period = MESH_DEFAULT_DTIM_PERIOD,
91 };
92
__cfg80211_join_mesh(struct cfg80211_registered_device * rdev,struct net_device * dev,struct mesh_setup * setup,const struct mesh_config * conf)93 int __cfg80211_join_mesh(struct cfg80211_registered_device *rdev,
94 struct net_device *dev,
95 struct mesh_setup *setup,
96 const struct mesh_config *conf)
97 {
98 struct wireless_dev *wdev = dev->ieee80211_ptr;
99 int err;
100
101 BUILD_BUG_ON(IEEE80211_MAX_SSID_LEN != IEEE80211_MAX_MESH_ID_LEN);
102
103 ASSERT_WDEV_LOCK(wdev);
104
105 if (dev->ieee80211_ptr->iftype != NL80211_IFTYPE_MESH_POINT)
106 return -EOPNOTSUPP;
107
108 if (!(rdev->wiphy.flags & WIPHY_FLAG_MESH_AUTH) &&
109 setup->is_secure)
110 return -EOPNOTSUPP;
111
112 if (wdev->mesh_id_len)
113 return -EALREADY;
114
115 if (!setup->mesh_id_len)
116 return -EINVAL;
117
118 if (!rdev->ops->join_mesh)
119 return -EOPNOTSUPP;
120
121 if (!setup->chandef.chan) {
122 /* if no channel explicitly given, use preset channel */
123 setup->chandef = wdev->preset_chandef;
124 }
125
126 if (!setup->chandef.chan) {
127 /* if we don't have that either, use the first usable channel */
128 enum ieee80211_band band;
129
130 for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
131 struct ieee80211_supported_band *sband;
132 struct ieee80211_channel *chan;
133 int i;
134
135 sband = rdev->wiphy.bands[band];
136 if (!sband)
137 continue;
138
139 for (i = 0; i < sband->n_channels; i++) {
140 chan = &sband->channels[i];
141 if (chan->flags & (IEEE80211_CHAN_NO_IBSS |
142 IEEE80211_CHAN_PASSIVE_SCAN |
143 IEEE80211_CHAN_DISABLED |
144 IEEE80211_CHAN_RADAR))
145 continue;
146 setup->chandef.chan = chan;
147 break;
148 }
149
150 if (setup->chandef.chan)
151 break;
152 }
153
154 /* no usable channel ... */
155 if (!setup->chandef.chan)
156 return -EINVAL;
157
158 setup->chandef.width = NL80211_CHAN_WIDTH_20_NOHT;
159 setup->chandef.center_freq1 = setup->chandef.chan->center_freq;
160 }
161
162 if (!cfg80211_reg_can_beacon(&rdev->wiphy, &setup->chandef))
163 return -EINVAL;
164
165 err = cfg80211_can_use_chan(rdev, wdev, setup->chandef.chan,
166 CHAN_MODE_SHARED);
167 if (err)
168 return err;
169
170 err = rdev_join_mesh(rdev, dev, conf, setup);
171 if (!err) {
172 memcpy(wdev->ssid, setup->mesh_id, setup->mesh_id_len);
173 wdev->mesh_id_len = setup->mesh_id_len;
174 wdev->channel = setup->chandef.chan;
175 }
176
177 return err;
178 }
179
cfg80211_join_mesh(struct cfg80211_registered_device * rdev,struct net_device * dev,struct mesh_setup * setup,const struct mesh_config * conf)180 int cfg80211_join_mesh(struct cfg80211_registered_device *rdev,
181 struct net_device *dev,
182 struct mesh_setup *setup,
183 const struct mesh_config *conf)
184 {
185 struct wireless_dev *wdev = dev->ieee80211_ptr;
186 int err;
187
188 mutex_lock(&rdev->devlist_mtx);
189 wdev_lock(wdev);
190 err = __cfg80211_join_mesh(rdev, dev, setup, conf);
191 wdev_unlock(wdev);
192 mutex_unlock(&rdev->devlist_mtx);
193
194 return err;
195 }
196
cfg80211_set_mesh_channel(struct cfg80211_registered_device * rdev,struct wireless_dev * wdev,struct cfg80211_chan_def * chandef)197 int cfg80211_set_mesh_channel(struct cfg80211_registered_device *rdev,
198 struct wireless_dev *wdev,
199 struct cfg80211_chan_def *chandef)
200 {
201 int err;
202
203 /*
204 * Workaround for libertas (only!), it puts the interface
205 * into mesh mode but doesn't implement join_mesh. Instead,
206 * it is configured via sysfs and then joins the mesh when
207 * you set the channel. Note that the libertas mesh isn't
208 * compatible with 802.11 mesh.
209 */
210 if (rdev->ops->libertas_set_mesh_channel) {
211 if (chandef->width != NL80211_CHAN_WIDTH_20_NOHT)
212 return -EINVAL;
213
214 if (!netif_running(wdev->netdev))
215 return -ENETDOWN;
216
217 err = cfg80211_can_use_chan(rdev, wdev, chandef->chan,
218 CHAN_MODE_SHARED);
219 if (err)
220 return err;
221
222 err = rdev_libertas_set_mesh_channel(rdev, wdev->netdev,
223 chandef->chan);
224 if (!err)
225 wdev->channel = chandef->chan;
226
227 return err;
228 }
229
230 if (wdev->mesh_id_len)
231 return -EBUSY;
232
233 wdev->preset_chandef = *chandef;
234 return 0;
235 }
236
__cfg80211_leave_mesh(struct cfg80211_registered_device * rdev,struct net_device * dev)237 static int __cfg80211_leave_mesh(struct cfg80211_registered_device *rdev,
238 struct net_device *dev)
239 {
240 struct wireless_dev *wdev = dev->ieee80211_ptr;
241 int err;
242
243 ASSERT_WDEV_LOCK(wdev);
244
245 if (dev->ieee80211_ptr->iftype != NL80211_IFTYPE_MESH_POINT)
246 return -EOPNOTSUPP;
247
248 if (!rdev->ops->leave_mesh)
249 return -EOPNOTSUPP;
250
251 if (!wdev->mesh_id_len)
252 return -ENOTCONN;
253
254 err = rdev_leave_mesh(rdev, dev);
255 if (!err) {
256 wdev->mesh_id_len = 0;
257 wdev->channel = NULL;
258 }
259
260 return err;
261 }
262
cfg80211_leave_mesh(struct cfg80211_registered_device * rdev,struct net_device * dev)263 int cfg80211_leave_mesh(struct cfg80211_registered_device *rdev,
264 struct net_device *dev)
265 {
266 struct wireless_dev *wdev = dev->ieee80211_ptr;
267 int err;
268
269 wdev_lock(wdev);
270 err = __cfg80211_leave_mesh(rdev, dev);
271 wdev_unlock(wdev);
272
273 return err;
274 }
275