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b2441318 | 1 | // SPDX-License-Identifier: GPL-2.0 |
29cbe68c | 2 | #include <linux/ieee80211.h> |
bc3b2d7f | 3 | #include <linux/export.h> |
29cbe68c | 4 | #include <net/cfg80211.h> |
c93b5e71 | 5 | #include "nl80211.h" |
29cbe68c | 6 | #include "core.h" |
e35e4d28 | 7 | #include "rdev-ops.h" |
29cbe68c JB |
8 | |
9 | /* Default values, timeouts in ms */ | |
10 | #define MESH_TTL 31 | |
11 | #define MESH_DEFAULT_ELEMENT_TTL 31 | |
12 | #define MESH_MAX_RETR 3 | |
13 | #define MESH_RET_T 100 | |
14 | #define MESH_CONF_T 100 | |
15 | #define MESH_HOLD_T 100 | |
16 | ||
17 | #define MESH_PATH_TIMEOUT 5000 | |
0507e159 | 18 | #define MESH_RANN_INTERVAL 5000 |
ac1073a6 CYY |
19 | #define MESH_PATH_TO_ROOT_TIMEOUT 6000 |
20 | #define MESH_ROOT_INTERVAL 5000 | |
728b19e5 | 21 | #define MESH_ROOT_CONFIRMATION_INTERVAL 2000 |
8e7c0538 | 22 | #define MESH_DEFAULT_PLINK_TIMEOUT 1800 /* timeout in seconds */ |
29cbe68c JB |
23 | |
24 | /* | |
25 | * Minimum interval between two consecutive PREQs originated by the same | |
26 | * interface | |
27 | */ | |
28 | #define MESH_PREQ_MIN_INT 10 | |
dca7e943 | 29 | #define MESH_PERR_MIN_INT 100 |
29cbe68c JB |
30 | #define MESH_DIAM_TRAVERSAL_TIME 50 |
31 | ||
55335137 AN |
32 | #define MESH_RSSI_THRESHOLD 0 |
33 | ||
29cbe68c JB |
34 | /* |
35 | * A path will be refreshed if it is used PATH_REFRESH_TIME milliseconds | |
36 | * before timing out. This way it will remain ACTIVE and no data frames | |
37 | * will be unnecessarily held in the pending queue. | |
38 | */ | |
39 | #define MESH_PATH_REFRESH_TIME 1000 | |
40 | #define MESH_MIN_DISCOVERY_TIMEOUT (2 * MESH_DIAM_TRAVERSAL_TIME) | |
41 | ||
42 | /* Default maximum number of established plinks per interface */ | |
43 | #define MESH_MAX_ESTAB_PLINKS 32 | |
44 | ||
45 | #define MESH_MAX_PREQ_RETRIES 4 | |
46 | ||
d299a1f2 | 47 | #define MESH_SYNC_NEIGHBOR_OFFSET_MAX 50 |
29cbe68c | 48 | |
9bdbf04d MP |
49 | #define MESH_DEFAULT_BEACON_INTERVAL 1000 /* in 1024 us units (=TUs) */ |
50 | #define MESH_DEFAULT_DTIM_PERIOD 2 | |
3b1c5a53 | 51 | #define MESH_DEFAULT_AWAKE_WINDOW 10 /* in 1024 us units (=TUs) */ |
9bdbf04d | 52 | |
29cbe68c JB |
53 | const struct mesh_config default_mesh_config = { |
54 | .dot11MeshRetryTimeout = MESH_RET_T, | |
55 | .dot11MeshConfirmTimeout = MESH_CONF_T, | |
56 | .dot11MeshHoldingTimeout = MESH_HOLD_T, | |
57 | .dot11MeshMaxRetries = MESH_MAX_RETR, | |
58 | .dot11MeshTTL = MESH_TTL, | |
59 | .element_ttl = MESH_DEFAULT_ELEMENT_TTL, | |
60 | .auto_open_plinks = true, | |
61 | .dot11MeshMaxPeerLinks = MESH_MAX_ESTAB_PLINKS, | |
d299a1f2 | 62 | .dot11MeshNbrOffsetMaxNeighbor = MESH_SYNC_NEIGHBOR_OFFSET_MAX, |
29cbe68c JB |
63 | .dot11MeshHWMPactivePathTimeout = MESH_PATH_TIMEOUT, |
64 | .dot11MeshHWMPpreqMinInterval = MESH_PREQ_MIN_INT, | |
dca7e943 | 65 | .dot11MeshHWMPperrMinInterval = MESH_PERR_MIN_INT, |
29cbe68c JB |
66 | .dot11MeshHWMPnetDiameterTraversalTime = MESH_DIAM_TRAVERSAL_TIME, |
67 | .dot11MeshHWMPmaxPREQretries = MESH_MAX_PREQ_RETRIES, | |
68 | .path_refresh_time = MESH_PATH_REFRESH_TIME, | |
69 | .min_discovery_timeout = MESH_MIN_DISCOVERY_TIMEOUT, | |
0507e159 | 70 | .dot11MeshHWMPRannInterval = MESH_RANN_INTERVAL, |
16dd7267 | 71 | .dot11MeshGateAnnouncementProtocol = false, |
94f90656 | 72 | .dot11MeshForwarding = true, |
55335137 | 73 | .rssi_threshold = MESH_RSSI_THRESHOLD, |
70c33eaa | 74 | .ht_opmode = IEEE80211_HT_OP_MODE_PROTECTION_NONHT_MIXED, |
ac1073a6 CYY |
75 | .dot11MeshHWMPactivePathToRootTimeout = MESH_PATH_TO_ROOT_TIMEOUT, |
76 | .dot11MeshHWMProotInterval = MESH_ROOT_INTERVAL, | |
728b19e5 | 77 | .dot11MeshHWMPconfirmationInterval = MESH_ROOT_CONFIRMATION_INTERVAL, |
3b1c5a53 MP |
78 | .power_mode = NL80211_MESH_POWER_ACTIVE, |
79 | .dot11MeshAwakeWindowDuration = MESH_DEFAULT_AWAKE_WINDOW, | |
8e7c0538 | 80 | .plink_timeout = MESH_DEFAULT_PLINK_TIMEOUT, |
29cbe68c JB |
81 | }; |
82 | ||
c80d545d | 83 | const struct mesh_setup default_mesh_setup = { |
cc1d2806 | 84 | /* cfg80211_join_mesh() will pick a channel if needed */ |
d299a1f2 | 85 | .sync_method = IEEE80211_SYNC_METHOD_NEIGHBOR_OFFSET, |
c80d545d JC |
86 | .path_sel_proto = IEEE80211_PATH_PROTOCOL_HWMP, |
87 | .path_metric = IEEE80211_PATH_METRIC_AIRTIME, | |
6e16d90b | 88 | .auth_id = 0, /* open */ |
581a8b0f JC |
89 | .ie = NULL, |
90 | .ie_len = 0, | |
5cff5e01 | 91 | .is_secure = false, |
bb2798d4 | 92 | .user_mpm = false, |
9bdbf04d MP |
93 | .beacon_interval = MESH_DEFAULT_BEACON_INTERVAL, |
94 | .dtim_period = MESH_DEFAULT_DTIM_PERIOD, | |
c80d545d | 95 | }; |
29cbe68c JB |
96 | |
97 | int __cfg80211_join_mesh(struct cfg80211_registered_device *rdev, | |
98 | struct net_device *dev, | |
cc1d2806 | 99 | struct mesh_setup *setup, |
29cbe68c JB |
100 | const struct mesh_config *conf) |
101 | { | |
102 | struct wireless_dev *wdev = dev->ieee80211_ptr; | |
29cbe68c JB |
103 | 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 | ||
15d5dda6 JC |
112 | if (!(rdev->wiphy.flags & WIPHY_FLAG_MESH_AUTH) && |
113 | setup->is_secure) | |
114 | return -EOPNOTSUPP; | |
115 | ||
29cbe68c JB |
116 | if (wdev->mesh_id_len) |
117 | return -EALREADY; | |
118 | ||
c80d545d | 119 | if (!setup->mesh_id_len) |
29cbe68c JB |
120 | return -EINVAL; |
121 | ||
122 | if (!rdev->ops->join_mesh) | |
123 | return -EOPNOTSUPP; | |
124 | ||
683b6d3b | 125 | if (!setup->chandef.chan) { |
cc1d2806 | 126 | /* if no channel explicitly given, use preset channel */ |
683b6d3b | 127 | setup->chandef = wdev->preset_chandef; |
cc1d2806 JB |
128 | } |
129 | ||
683b6d3b | 130 | if (!setup->chandef.chan) { |
cc1d2806 | 131 | /* if we don't have that either, use the first usable channel */ |
57fbcce3 | 132 | enum nl80211_band band; |
cc1d2806 | 133 | |
57fbcce3 | 134 | for (band = 0; band < NUM_NL80211_BANDS; band++) { |
cc1d2806 JB |
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]; | |
8fe02e16 | 145 | if (chan->flags & (IEEE80211_CHAN_NO_IR | |
cc1d2806 JB |
146 | IEEE80211_CHAN_DISABLED | |
147 | IEEE80211_CHAN_RADAR)) | |
148 | continue; | |
683b6d3b | 149 | setup->chandef.chan = chan; |
cc1d2806 JB |
150 | break; |
151 | } | |
152 | ||
683b6d3b | 153 | if (setup->chandef.chan) |
cc1d2806 JB |
154 | break; |
155 | } | |
156 | ||
157 | /* no usable channel ... */ | |
683b6d3b | 158 | if (!setup->chandef.chan) |
cc1d2806 JB |
159 | return -EINVAL; |
160 | ||
da29d2a5 MP |
161 | setup->chandef.width = NL80211_CHAN_WIDTH_20_NOHT; |
162 | setup->chandef.center_freq1 = setup->chandef.chan->center_freq; | |
cc1d2806 JB |
163 | } |
164 | ||
ffb3cf30 AN |
165 | /* |
166 | * check if basic rates are available otherwise use mandatory rates as | |
167 | * basic rates | |
168 | */ | |
169 | if (!setup->basic_rates) { | |
74608aca | 170 | enum nl80211_bss_scan_width scan_width; |
ffb3cf30 AN |
171 | struct ieee80211_supported_band *sband = |
172 | rdev->wiphy.bands[setup->chandef.chan->band]; | |
c028c630 JB |
173 | |
174 | if (setup->chandef.chan->band == NL80211_BAND_2GHZ) { | |
175 | int i; | |
176 | ||
177 | /* | |
178 | * Older versions selected the mandatory rates for | |
179 | * 2.4 GHz as well, but were broken in that only | |
180 | * 1 Mbps was regarded as a mandatory rate. Keep | |
181 | * using just 1 Mbps as the default basic rate for | |
182 | * mesh to be interoperable with older versions. | |
183 | */ | |
184 | for (i = 0; i < sband->n_bitrates; i++) { | |
185 | if (sband->bitrates[i].bitrate == 10) { | |
186 | setup->basic_rates = BIT(i); | |
187 | break; | |
188 | } | |
189 | } | |
190 | } else { | |
191 | scan_width = cfg80211_chandef_to_scan_width(&setup->chandef); | |
192 | setup->basic_rates = ieee80211_mandatory_rates(sband, | |
193 | scan_width); | |
194 | } | |
ffb3cf30 AN |
195 | } |
196 | ||
d37d49c2 BB |
197 | err = cfg80211_chandef_dfs_required(&rdev->wiphy, |
198 | &setup->chandef, | |
199 | NL80211_IFTYPE_MESH_POINT); | |
200 | if (err < 0) | |
201 | return err; | |
202 | if (err > 0 && !setup->userspace_handles_dfs) | |
203 | return -EINVAL; | |
204 | ||
174e0cd2 IP |
205 | if (!cfg80211_reg_can_beacon(&rdev->wiphy, &setup->chandef, |
206 | NL80211_IFTYPE_MESH_POINT)) | |
cc1d2806 JB |
207 | return -EINVAL; |
208 | ||
e35e4d28 | 209 | err = rdev_join_mesh(rdev, dev, conf, setup); |
29cbe68c | 210 | if (!err) { |
c80d545d JC |
211 | memcpy(wdev->ssid, setup->mesh_id, setup->mesh_id_len); |
212 | wdev->mesh_id_len = setup->mesh_id_len; | |
9e0e2961 | 213 | wdev->chandef = setup->chandef; |
275fcf62 | 214 | wdev->beacon_interval = setup->beacon_interval; |
29cbe68c JB |
215 | } |
216 | ||
217 | return err; | |
218 | } | |
219 | ||
683b6d3b JB |
220 | int cfg80211_set_mesh_channel(struct cfg80211_registered_device *rdev, |
221 | struct wireless_dev *wdev, | |
222 | struct cfg80211_chan_def *chandef) | |
cc1d2806 | 223 | { |
f4489ebe | 224 | int err; |
cc1d2806 JB |
225 | |
226 | /* | |
227 | * Workaround for libertas (only!), it puts the interface | |
228 | * into mesh mode but doesn't implement join_mesh. Instead, | |
229 | * it is configured via sysfs and then joins the mesh when | |
230 | * you set the channel. Note that the libertas mesh isn't | |
231 | * compatible with 802.11 mesh. | |
232 | */ | |
e8c9bd5b | 233 | if (rdev->ops->libertas_set_mesh_channel) { |
3d9d1d66 | 234 | if (chandef->width != NL80211_CHAN_WIDTH_20_NOHT) |
e8c9bd5b | 235 | return -EINVAL; |
cc1d2806 JB |
236 | |
237 | if (!netif_running(wdev->netdev)) | |
238 | return -ENETDOWN; | |
f4489ebe | 239 | |
e35e4d28 | 240 | err = rdev_libertas_set_mesh_channel(rdev, wdev->netdev, |
683b6d3b | 241 | chandef->chan); |
f4489ebe | 242 | if (!err) |
9e0e2961 | 243 | wdev->chandef = *chandef; |
f4489ebe MK |
244 | |
245 | return err; | |
cc1d2806 JB |
246 | } |
247 | ||
248 | if (wdev->mesh_id_len) | |
249 | return -EBUSY; | |
250 | ||
683b6d3b | 251 | wdev->preset_chandef = *chandef; |
cc1d2806 JB |
252 | return 0; |
253 | } | |
254 | ||
f04c2203 MK |
255 | int __cfg80211_leave_mesh(struct cfg80211_registered_device *rdev, |
256 | struct net_device *dev) | |
29cbe68c JB |
257 | { |
258 | struct wireless_dev *wdev = dev->ieee80211_ptr; | |
259 | int err; | |
260 | ||
261 | ASSERT_WDEV_LOCK(wdev); | |
262 | ||
263 | if (dev->ieee80211_ptr->iftype != NL80211_IFTYPE_MESH_POINT) | |
264 | return -EOPNOTSUPP; | |
265 | ||
266 | if (!rdev->ops->leave_mesh) | |
267 | return -EOPNOTSUPP; | |
268 | ||
269 | if (!wdev->mesh_id_len) | |
270 | return -ENOTCONN; | |
271 | ||
e35e4d28 | 272 | err = rdev_leave_mesh(rdev, dev); |
f4489ebe | 273 | if (!err) { |
188c1b3c | 274 | wdev->conn_owner_nlportid = 0; |
29cbe68c | 275 | wdev->mesh_id_len = 0; |
275fcf62 | 276 | wdev->beacon_interval = 0; |
9e0e2961 | 277 | memset(&wdev->chandef, 0, sizeof(wdev->chandef)); |
fa9ffc74 | 278 | rdev_set_qos_map(rdev, dev, NULL); |
b35a51c7 | 279 | cfg80211_sched_dfs_chan_update(rdev); |
f4489ebe MK |
280 | } |
281 | ||
29cbe68c JB |
282 | return err; |
283 | } | |
284 | ||
285 | int cfg80211_leave_mesh(struct cfg80211_registered_device *rdev, | |
286 | struct net_device *dev) | |
287 | { | |
288 | struct wireless_dev *wdev = dev->ieee80211_ptr; | |
289 | int err; | |
290 | ||
291 | wdev_lock(wdev); | |
292 | err = __cfg80211_leave_mesh(rdev, dev); | |
293 | wdev_unlock(wdev); | |
294 | ||
295 | return err; | |
296 | } |