Merge branch 'next/soc2' into HEAD
[firefly-linux-kernel-4.4.55.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
7 /* Default values, timeouts in ms */
8 #define MESH_TTL                31
9 #define MESH_DEFAULT_ELEMENT_TTL 31
10 #define MESH_MAX_RETR           3
11 #define MESH_RET_T              100
12 #define MESH_CONF_T             100
13 #define MESH_HOLD_T             100
14
15 #define MESH_PATH_TIMEOUT       5000
16 #define MESH_RANN_INTERVAL      5000
17 #define MESH_PATH_TO_ROOT_TIMEOUT      6000
18 #define MESH_ROOT_INTERVAL     5000
19 #define MESH_ROOT_CONFIRMATION_INTERVAL 2000
20
21 /*
22  * Minimum interval between two consecutive PREQs originated by the same
23  * interface
24  */
25 #define MESH_PREQ_MIN_INT       10
26 #define MESH_PERR_MIN_INT       100
27 #define MESH_DIAM_TRAVERSAL_TIME 50
28
29 #define MESH_RSSI_THRESHOLD     0
30
31 /*
32  * A path will be refreshed if it is used PATH_REFRESH_TIME milliseconds
33  * before timing out.  This way it will remain ACTIVE and no data frames
34  * will be unnecessarily held in the pending queue.
35  */
36 #define MESH_PATH_REFRESH_TIME                  1000
37 #define MESH_MIN_DISCOVERY_TIMEOUT (2 * MESH_DIAM_TRAVERSAL_TIME)
38
39 /* Default maximum number of established plinks per interface */
40 #define MESH_MAX_ESTAB_PLINKS   32
41
42 #define MESH_MAX_PREQ_RETRIES   4
43
44 #define MESH_SYNC_NEIGHBOR_OFFSET_MAX 50
45
46 const struct mesh_config default_mesh_config = {
47         .dot11MeshRetryTimeout = MESH_RET_T,
48         .dot11MeshConfirmTimeout = MESH_CONF_T,
49         .dot11MeshHoldingTimeout = MESH_HOLD_T,
50         .dot11MeshMaxRetries = MESH_MAX_RETR,
51         .dot11MeshTTL = MESH_TTL,
52         .element_ttl = MESH_DEFAULT_ELEMENT_TTL,
53         .auto_open_plinks = true,
54         .dot11MeshMaxPeerLinks = MESH_MAX_ESTAB_PLINKS,
55         .dot11MeshNbrOffsetMaxNeighbor = MESH_SYNC_NEIGHBOR_OFFSET_MAX,
56         .dot11MeshHWMPactivePathTimeout = MESH_PATH_TIMEOUT,
57         .dot11MeshHWMPpreqMinInterval = MESH_PREQ_MIN_INT,
58         .dot11MeshHWMPperrMinInterval = MESH_PERR_MIN_INT,
59         .dot11MeshHWMPnetDiameterTraversalTime = MESH_DIAM_TRAVERSAL_TIME,
60         .dot11MeshHWMPmaxPREQretries = MESH_MAX_PREQ_RETRIES,
61         .path_refresh_time = MESH_PATH_REFRESH_TIME,
62         .min_discovery_timeout = MESH_MIN_DISCOVERY_TIMEOUT,
63         .dot11MeshHWMPRannInterval = MESH_RANN_INTERVAL,
64         .dot11MeshGateAnnouncementProtocol = false,
65         .dot11MeshForwarding = true,
66         .rssi_threshold = MESH_RSSI_THRESHOLD,
67         .ht_opmode = IEEE80211_HT_OP_MODE_PROTECTION_NONHT_MIXED,
68         .dot11MeshHWMPactivePathToRootTimeout = MESH_PATH_TO_ROOT_TIMEOUT,
69         .dot11MeshHWMProotInterval = MESH_ROOT_INTERVAL,
70         .dot11MeshHWMPconfirmationInterval = MESH_ROOT_CONFIRMATION_INTERVAL,
71 };
72
73 const struct mesh_setup default_mesh_setup = {
74         /* cfg80211_join_mesh() will pick a channel if needed */
75         .channel = NULL,
76         .channel_type = NL80211_CHAN_NO_HT,
77         .sync_method = IEEE80211_SYNC_METHOD_NEIGHBOR_OFFSET,
78         .path_sel_proto = IEEE80211_PATH_PROTOCOL_HWMP,
79         .path_metric = IEEE80211_PATH_METRIC_AIRTIME,
80         .ie = NULL,
81         .ie_len = 0,
82         .is_secure = false,
83 };
84
85 int __cfg80211_join_mesh(struct cfg80211_registered_device *rdev,
86                          struct net_device *dev,
87                          struct mesh_setup *setup,
88                          const struct mesh_config *conf)
89 {
90         struct wireless_dev *wdev = dev->ieee80211_ptr;
91         int err;
92
93         BUILD_BUG_ON(IEEE80211_MAX_SSID_LEN != IEEE80211_MAX_MESH_ID_LEN);
94
95         ASSERT_WDEV_LOCK(wdev);
96
97         if (dev->ieee80211_ptr->iftype != NL80211_IFTYPE_MESH_POINT)
98                 return -EOPNOTSUPP;
99
100         if (!(rdev->wiphy.flags & WIPHY_FLAG_MESH_AUTH) &&
101               setup->is_secure)
102                 return -EOPNOTSUPP;
103
104         if (wdev->mesh_id_len)
105                 return -EALREADY;
106
107         if (!setup->mesh_id_len)
108                 return -EINVAL;
109
110         if (!rdev->ops->join_mesh)
111                 return -EOPNOTSUPP;
112
113         if (!setup->channel) {
114                 /* if no channel explicitly given, use preset channel */
115                 setup->channel = wdev->preset_chan;
116                 setup->channel_type = wdev->preset_chantype;
117         }
118
119         if (!setup->channel) {
120                 /* if we don't have that either, use the first usable channel */
121                 enum ieee80211_band band;
122
123                 for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
124                         struct ieee80211_supported_band *sband;
125                         struct ieee80211_channel *chan;
126                         int i;
127
128                         sband = rdev->wiphy.bands[band];
129                         if (!sband)
130                                 continue;
131
132                         for (i = 0; i < sband->n_channels; i++) {
133                                 chan = &sband->channels[i];
134                                 if (chan->flags & (IEEE80211_CHAN_NO_IBSS |
135                                                    IEEE80211_CHAN_PASSIVE_SCAN |
136                                                    IEEE80211_CHAN_DISABLED |
137                                                    IEEE80211_CHAN_RADAR))
138                                         continue;
139                                 setup->channel = chan;
140                                 break;
141                         }
142
143                         if (setup->channel)
144                                 break;
145                 }
146
147                 /* no usable channel ... */
148                 if (!setup->channel)
149                         return -EINVAL;
150
151                 setup->channel_type = NL80211_CHAN_NO_HT;
152         }
153
154         if (!cfg80211_can_beacon_sec_chan(&rdev->wiphy, setup->channel,
155                                           setup->channel_type))
156                 return -EINVAL;
157
158         err = cfg80211_can_use_chan(rdev, wdev, setup->channel,
159                                     CHAN_MODE_SHARED);
160         if (err)
161                 return err;
162
163         err = rdev->ops->join_mesh(&rdev->wiphy, dev, conf, setup);
164         if (!err) {
165                 memcpy(wdev->ssid, setup->mesh_id, setup->mesh_id_len);
166                 wdev->mesh_id_len = setup->mesh_id_len;
167                 wdev->channel = setup->channel;
168         }
169
170         return err;
171 }
172
173 int cfg80211_join_mesh(struct cfg80211_registered_device *rdev,
174                        struct net_device *dev,
175                        struct mesh_setup *setup,
176                        const struct mesh_config *conf)
177 {
178         struct wireless_dev *wdev = dev->ieee80211_ptr;
179         int err;
180
181         mutex_lock(&rdev->devlist_mtx);
182         wdev_lock(wdev);
183         err = __cfg80211_join_mesh(rdev, dev, setup, conf);
184         wdev_unlock(wdev);
185         mutex_unlock(&rdev->devlist_mtx);
186
187         return err;
188 }
189
190 int cfg80211_set_mesh_freq(struct cfg80211_registered_device *rdev,
191                            struct wireless_dev *wdev, int freq,
192                            enum nl80211_channel_type channel_type)
193 {
194         struct ieee80211_channel *channel;
195         int err;
196
197         channel = rdev_freq_to_chan(rdev, freq, channel_type);
198         if (!channel || !cfg80211_can_beacon_sec_chan(&rdev->wiphy,
199                                                       channel,
200                                                       channel_type)) {
201                 return -EINVAL;
202         }
203
204         /*
205          * Workaround for libertas (only!), it puts the interface
206          * into mesh mode but doesn't implement join_mesh. Instead,
207          * it is configured via sysfs and then joins the mesh when
208          * you set the channel. Note that the libertas mesh isn't
209          * compatible with 802.11 mesh.
210          */
211         if (rdev->ops->libertas_set_mesh_channel) {
212                 if (channel_type != NL80211_CHAN_NO_HT)
213                         return -EINVAL;
214
215                 if (!netif_running(wdev->netdev))
216                         return -ENETDOWN;
217
218                 err = cfg80211_can_use_chan(rdev, wdev, channel,
219                                             CHAN_MODE_SHARED);
220                 if (err)
221                         return err;
222
223                 err = rdev->ops->libertas_set_mesh_channel(&rdev->wiphy,
224                                                            wdev->netdev,
225                                                            channel);
226                 if (!err)
227                         wdev->channel = channel;
228
229                 return err;
230         }
231
232         if (wdev->mesh_id_len)
233                 return -EBUSY;
234
235         wdev->preset_chan = channel;
236         wdev->preset_chantype = channel_type;
237         return 0;
238 }
239
240 void cfg80211_notify_new_peer_candidate(struct net_device *dev,
241                 const u8 *macaddr, const u8* ie, u8 ie_len, gfp_t gfp)
242 {
243         struct wireless_dev *wdev = dev->ieee80211_ptr;
244
245         if (WARN_ON(wdev->iftype != NL80211_IFTYPE_MESH_POINT))
246                 return;
247
248         nl80211_send_new_peer_candidate(wiphy_to_dev(wdev->wiphy), dev,
249                         macaddr, ie, ie_len, gfp);
250 }
251 EXPORT_SYMBOL(cfg80211_notify_new_peer_candidate);
252
253 static int __cfg80211_leave_mesh(struct cfg80211_registered_device *rdev,
254                                  struct net_device *dev)
255 {
256         struct wireless_dev *wdev = dev->ieee80211_ptr;
257         int err;
258
259         ASSERT_WDEV_LOCK(wdev);
260
261         if (dev->ieee80211_ptr->iftype != NL80211_IFTYPE_MESH_POINT)
262                 return -EOPNOTSUPP;
263
264         if (!rdev->ops->leave_mesh)
265                 return -EOPNOTSUPP;
266
267         if (!wdev->mesh_id_len)
268                 return -ENOTCONN;
269
270         err = rdev->ops->leave_mesh(&rdev->wiphy, dev);
271         if (!err) {
272                 wdev->mesh_id_len = 0;
273                 wdev->channel = NULL;
274         }
275
276         return err;
277 }
278
279 int cfg80211_leave_mesh(struct cfg80211_registered_device *rdev,
280                         struct net_device *dev)
281 {
282         struct wireless_dev *wdev = dev->ieee80211_ptr;
283         int err;
284
285         wdev_lock(wdev);
286         err = __cfg80211_leave_mesh(rdev, dev);
287         wdev_unlock(wdev);
288
289         return err;
290 }