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Merge tag 'v4.9-rc3' into xtensa-for-next
[mirror_ubuntu-bionic-kernel.git] / net / wireless / mesh.c
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 #define MESH_DEFAULT_PLINK_TIMEOUT 1800 /* timeout in seconds */
22
23 /*
24 * Minimum interval between two consecutive PREQs originated by the same
25 * interface
26 */
27 #define MESH_PREQ_MIN_INT 10
28 #define MESH_PERR_MIN_INT 100
29 #define MESH_DIAM_TRAVERSAL_TIME 50
30
31 #define MESH_RSSI_THRESHOLD 0
32
33 /*
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
46 #define MESH_SYNC_NEIGHBOR_OFFSET_MAX 50
47
48 #define MESH_DEFAULT_BEACON_INTERVAL 1000 /* in 1024 us units (=TUs) */
49 #define MESH_DEFAULT_DTIM_PERIOD 2
50 #define MESH_DEFAULT_AWAKE_WINDOW 10 /* in 1024 us units (=TUs) */
51
52 const 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,
61 .dot11MeshNbrOffsetMaxNeighbor = MESH_SYNC_NEIGHBOR_OFFSET_MAX,
62 .dot11MeshHWMPactivePathTimeout = MESH_PATH_TIMEOUT,
63 .dot11MeshHWMPpreqMinInterval = MESH_PREQ_MIN_INT,
64 .dot11MeshHWMPperrMinInterval = MESH_PERR_MIN_INT,
65 .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,
69 .dot11MeshHWMPRannInterval = MESH_RANN_INTERVAL,
70 .dot11MeshGateAnnouncementProtocol = false,
71 .dot11MeshForwarding = true,
72 .rssi_threshold = MESH_RSSI_THRESHOLD,
73 .ht_opmode = IEEE80211_HT_OP_MODE_PROTECTION_NONHT_MIXED,
74 .dot11MeshHWMPactivePathToRootTimeout = MESH_PATH_TO_ROOT_TIMEOUT,
75 .dot11MeshHWMProotInterval = MESH_ROOT_INTERVAL,
76 .dot11MeshHWMPconfirmationInterval = MESH_ROOT_CONFIRMATION_INTERVAL,
77 .power_mode = NL80211_MESH_POWER_ACTIVE,
78 .dot11MeshAwakeWindowDuration = MESH_DEFAULT_AWAKE_WINDOW,
79 .plink_timeout = MESH_DEFAULT_PLINK_TIMEOUT,
80 };
81
82 const struct mesh_setup default_mesh_setup = {
83 /* cfg80211_join_mesh() will pick a channel if needed */
84 .sync_method = IEEE80211_SYNC_METHOD_NEIGHBOR_OFFSET,
85 .path_sel_proto = IEEE80211_PATH_PROTOCOL_HWMP,
86 .path_metric = IEEE80211_PATH_METRIC_AIRTIME,
87 .auth_id = 0, /* open */
88 .ie = NULL,
89 .ie_len = 0,
90 .is_secure = false,
91 .user_mpm = false,
92 .beacon_interval = MESH_DEFAULT_BEACON_INTERVAL,
93 .dtim_period = MESH_DEFAULT_DTIM_PERIOD,
94 };
95
96 int __cfg80211_join_mesh(struct cfg80211_registered_device *rdev,
97 struct net_device *dev,
98 struct mesh_setup *setup,
99 const struct mesh_config *conf)
100 {
101 struct wireless_dev *wdev = dev->ieee80211_ptr;
102 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
111 if (!(rdev->wiphy.flags & WIPHY_FLAG_MESH_AUTH) &&
112 setup->is_secure)
113 return -EOPNOTSUPP;
114
115 if (wdev->mesh_id_len)
116 return -EALREADY;
117
118 if (!setup->mesh_id_len)
119 return -EINVAL;
120
121 if (!rdev->ops->join_mesh)
122 return -EOPNOTSUPP;
123
124 if (!setup->chandef.chan) {
125 /* if no channel explicitly given, use preset channel */
126 setup->chandef = wdev->preset_chandef;
127 }
128
129 if (!setup->chandef.chan) {
130 /* if we don't have that either, use the first usable channel */
131 enum nl80211_band band;
132
133 for (band = 0; band < NUM_NL80211_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_IR |
145 IEEE80211_CHAN_DISABLED |
146 IEEE80211_CHAN_RADAR))
147 continue;
148 setup->chandef.chan = chan;
149 break;
150 }
151
152 if (setup->chandef.chan)
153 break;
154 }
155
156 /* no usable channel ... */
157 if (!setup->chandef.chan)
158 return -EINVAL;
159
160 setup->chandef.width = NL80211_CHAN_WIDTH_20_NOHT;
161 setup->chandef.center_freq1 = setup->chandef.chan->center_freq;
162 }
163
164 /*
165 * check if basic rates are available otherwise use mandatory rates as
166 * basic rates
167 */
168 if (!setup->basic_rates) {
169 enum nl80211_bss_scan_width scan_width;
170 struct ieee80211_supported_band *sband =
171 rdev->wiphy.bands[setup->chandef.chan->band];
172 scan_width = cfg80211_chandef_to_scan_width(&setup->chandef);
173 setup->basic_rates = ieee80211_mandatory_rates(sband,
174 scan_width);
175 }
176
177 if (!cfg80211_reg_can_beacon(&rdev->wiphy, &setup->chandef,
178 NL80211_IFTYPE_MESH_POINT))
179 return -EINVAL;
180
181 err = rdev_join_mesh(rdev, dev, conf, setup);
182 if (!err) {
183 memcpy(wdev->ssid, setup->mesh_id, setup->mesh_id_len);
184 wdev->mesh_id_len = setup->mesh_id_len;
185 wdev->chandef = setup->chandef;
186 }
187
188 return err;
189 }
190
191 int cfg80211_join_mesh(struct cfg80211_registered_device *rdev,
192 struct net_device *dev,
193 struct mesh_setup *setup,
194 const struct mesh_config *conf)
195 {
196 struct wireless_dev *wdev = dev->ieee80211_ptr;
197 int err;
198
199 wdev_lock(wdev);
200 err = __cfg80211_join_mesh(rdev, dev, setup, conf);
201 wdev_unlock(wdev);
202
203 return err;
204 }
205
206 int cfg80211_set_mesh_channel(struct cfg80211_registered_device *rdev,
207 struct wireless_dev *wdev,
208 struct cfg80211_chan_def *chandef)
209 {
210 int err;
211
212 /*
213 * Workaround for libertas (only!), it puts the interface
214 * into mesh mode but doesn't implement join_mesh. Instead,
215 * it is configured via sysfs and then joins the mesh when
216 * you set the channel. Note that the libertas mesh isn't
217 * compatible with 802.11 mesh.
218 */
219 if (rdev->ops->libertas_set_mesh_channel) {
220 if (chandef->width != NL80211_CHAN_WIDTH_20_NOHT)
221 return -EINVAL;
222
223 if (!netif_running(wdev->netdev))
224 return -ENETDOWN;
225
226 err = rdev_libertas_set_mesh_channel(rdev, wdev->netdev,
227 chandef->chan);
228 if (!err)
229 wdev->chandef = *chandef;
230
231 return err;
232 }
233
234 if (wdev->mesh_id_len)
235 return -EBUSY;
236
237 wdev->preset_chandef = *chandef;
238 return 0;
239 }
240
241 int __cfg80211_leave_mesh(struct cfg80211_registered_device *rdev,
242 struct net_device *dev)
243 {
244 struct wireless_dev *wdev = dev->ieee80211_ptr;
245 int err;
246
247 ASSERT_WDEV_LOCK(wdev);
248
249 if (dev->ieee80211_ptr->iftype != NL80211_IFTYPE_MESH_POINT)
250 return -EOPNOTSUPP;
251
252 if (!rdev->ops->leave_mesh)
253 return -EOPNOTSUPP;
254
255 if (!wdev->mesh_id_len)
256 return -ENOTCONN;
257
258 err = rdev_leave_mesh(rdev, dev);
259 if (!err) {
260 wdev->mesh_id_len = 0;
261 memset(&wdev->chandef, 0, sizeof(wdev->chandef));
262 rdev_set_qos_map(rdev, dev, NULL);
263 }
264
265 return err;
266 }
267
268 int 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 }