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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"
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
Javier Cardona0507e152011-08-09 16:45:10 -070016#define MESH_RANN_INTERVAL 5000
Chun-Yeow Yeohac1073a2012-06-14 02:06:06 +080017#define MESH_PATH_TO_ROOT_TIMEOUT 6000
18#define MESH_ROOT_INTERVAL 5000
Chun-Yeow Yeoh728b19e2012-06-14 02:06:10 +080019#define MESH_ROOT_CONFIRMATION_INTERVAL 2000
Johannes Berg29cbe682010-12-03 09:20:44 +010020
21/*
22 * Minimum interval between two consecutive PREQs originated by the same
23 * interface
24 */
25#define MESH_PREQ_MIN_INT 10
Thomas Pedersendca7e942011-11-24 17:15:24 -080026#define MESH_PERR_MIN_INT 100
Johannes Berg29cbe682010-12-03 09:20:44 +010027#define MESH_DIAM_TRAVERSAL_TIME 50
28
Ashok Nagarajan55335132012-02-28 17:04:08 -080029#define MESH_RSSI_THRESHOLD 0
30
Johannes Berg29cbe682010-12-03 09:20:44 +010031/*
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
Javier Cardonad299a1f2012-03-31 11:31:33 -070044#define MESH_SYNC_NEIGHBOR_OFFSET_MAX 50
Johannes Berg29cbe682010-12-03 09:20:44 +010045
46const 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,
Javier Cardonad299a1f2012-03-31 11:31:33 -070055 .dot11MeshNbrOffsetMaxNeighbor = MESH_SYNC_NEIGHBOR_OFFSET_MAX,
Johannes Berg29cbe682010-12-03 09:20:44 +010056 .dot11MeshHWMPactivePathTimeout = MESH_PATH_TIMEOUT,
57 .dot11MeshHWMPpreqMinInterval = MESH_PREQ_MIN_INT,
Thomas Pedersendca7e942011-11-24 17:15:24 -080058 .dot11MeshHWMPperrMinInterval = MESH_PERR_MIN_INT,
Johannes Berg29cbe682010-12-03 09:20:44 +010059 .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,
Javier Cardona0507e152011-08-09 16:45:10 -070063 .dot11MeshHWMPRannInterval = MESH_RANN_INTERVAL,
Javier Cardona16dd7262011-08-09 16:45:11 -070064 .dot11MeshGateAnnouncementProtocol = false,
Chun-Yeow Yeoh94f90652012-01-21 01:02:16 +080065 .dot11MeshForwarding = true,
Ashok Nagarajan55335132012-02-28 17:04:08 -080066 .rssi_threshold = MESH_RSSI_THRESHOLD,
Ashok Nagarajan70c33ea2012-04-30 14:20:32 -070067 .ht_opmode = IEEE80211_HT_OP_MODE_PROTECTION_NONHT_MIXED,
Chun-Yeow Yeohac1073a2012-06-14 02:06:06 +080068 .dot11MeshHWMPactivePathToRootTimeout = MESH_PATH_TO_ROOT_TIMEOUT,
69 .dot11MeshHWMProotInterval = MESH_ROOT_INTERVAL,
Chun-Yeow Yeoh728b19e2012-06-14 02:06:10 +080070 .dot11MeshHWMPconfirmationInterval = MESH_ROOT_CONFIRMATION_INTERVAL,
Johannes Berg29cbe682010-12-03 09:20:44 +010071};
72
Javier Cardonac80d5452010-12-16 17:37:49 -080073const struct mesh_setup default_mesh_setup = {
Johannes Bergcc1d2802012-05-16 23:50:20 +020074 /* cfg80211_join_mesh() will pick a channel if needed */
75 .channel = NULL,
76 .channel_type = NL80211_CHAN_NO_HT,
Javier Cardonad299a1f2012-03-31 11:31:33 -070077 .sync_method = IEEE80211_SYNC_METHOD_NEIGHBOR_OFFSET,
Javier Cardonac80d5452010-12-16 17:37:49 -080078 .path_sel_proto = IEEE80211_PATH_PROTOCOL_HWMP,
79 .path_metric = IEEE80211_PATH_METRIC_AIRTIME,
Javier Cardona581a8b02011-04-07 15:08:27 -070080 .ie = NULL,
81 .ie_len = 0,
Javier Cardona5cff5e02011-04-07 15:08:29 -070082 .is_secure = false,
Javier Cardonac80d5452010-12-16 17:37:49 -080083};
Johannes Berg29cbe682010-12-03 09:20:44 +010084
85int __cfg80211_join_mesh(struct cfg80211_registered_device *rdev,
86 struct net_device *dev,
Johannes Bergcc1d2802012-05-16 23:50:20 +020087 struct mesh_setup *setup,
Johannes Berg29cbe682010-12-03 09:20:44 +010088 const struct mesh_config *conf)
89{
90 struct wireless_dev *wdev = dev->ieee80211_ptr;
Johannes Berg29cbe682010-12-03 09:20:44 +010091 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
Javier Cardona15d5dda2011-04-07 15:08:28 -0700100 if (!(rdev->wiphy.flags & WIPHY_FLAG_MESH_AUTH) &&
101 setup->is_secure)
102 return -EOPNOTSUPP;
103
Johannes Berg29cbe682010-12-03 09:20:44 +0100104 if (wdev->mesh_id_len)
105 return -EALREADY;
106
Javier Cardonac80d5452010-12-16 17:37:49 -0800107 if (!setup->mesh_id_len)
Johannes Berg29cbe682010-12-03 09:20:44 +0100108 return -EINVAL;
109
110 if (!rdev->ops->join_mesh)
111 return -EOPNOTSUPP;
112
Johannes Bergcc1d2802012-05-16 23:50:20 +0200113 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
Javier Cardonac80d5452010-12-16 17:37:49 -0800158 err = rdev->ops->join_mesh(&rdev->wiphy, dev, conf, setup);
Johannes Berg29cbe682010-12-03 09:20:44 +0100159 if (!err) {
Javier Cardonac80d5452010-12-16 17:37:49 -0800160 memcpy(wdev->ssid, setup->mesh_id, setup->mesh_id_len);
161 wdev->mesh_id_len = setup->mesh_id_len;
Michal Kaziorf4489eb2012-06-29 12:46:58 +0200162 wdev->channel = setup->channel;
Johannes Berg29cbe682010-12-03 09:20:44 +0100163 }
164
165 return err;
166}
167
168int cfg80211_join_mesh(struct cfg80211_registered_device *rdev,
169 struct net_device *dev,
Johannes Bergcc1d2802012-05-16 23:50:20 +0200170 struct mesh_setup *setup,
Johannes Berg29cbe682010-12-03 09:20:44 +0100171 const struct mesh_config *conf)
172{
173 struct wireless_dev *wdev = dev->ieee80211_ptr;
174 int err;
175
176 wdev_lock(wdev);
Javier Cardonac80d5452010-12-16 17:37:49 -0800177 err = __cfg80211_join_mesh(rdev, dev, setup, conf);
Johannes Berg29cbe682010-12-03 09:20:44 +0100178 wdev_unlock(wdev);
179
180 return err;
181}
182
Johannes Bergcc1d2802012-05-16 23:50:20 +0200183int cfg80211_set_mesh_freq(struct cfg80211_registered_device *rdev,
184 struct wireless_dev *wdev, int freq,
185 enum nl80211_channel_type channel_type)
186{
187 struct ieee80211_channel *channel;
Michal Kaziorf4489eb2012-06-29 12:46:58 +0200188 int err;
Johannes Bergcc1d2802012-05-16 23:50:20 +0200189
Johannes Berge8c9bd52012-06-06 08:18:22 +0200190 channel = rdev_freq_to_chan(rdev, freq, channel_type);
191 if (!channel || !cfg80211_can_beacon_sec_chan(&rdev->wiphy,
192 channel,
193 channel_type)) {
194 return -EINVAL;
195 }
196
Johannes Bergcc1d2802012-05-16 23:50:20 +0200197 /*
198 * Workaround for libertas (only!), it puts the interface
199 * into mesh mode but doesn't implement join_mesh. Instead,
200 * it is configured via sysfs and then joins the mesh when
201 * you set the channel. Note that the libertas mesh isn't
202 * compatible with 802.11 mesh.
203 */
Johannes Berge8c9bd52012-06-06 08:18:22 +0200204 if (rdev->ops->libertas_set_mesh_channel) {
205 if (channel_type != NL80211_CHAN_NO_HT)
206 return -EINVAL;
Johannes Bergcc1d2802012-05-16 23:50:20 +0200207
208 if (!netif_running(wdev->netdev))
209 return -ENETDOWN;
Michal Kaziorf4489eb2012-06-29 12:46:58 +0200210
211 err = rdev->ops->libertas_set_mesh_channel(&rdev->wiphy,
212 wdev->netdev,
213 channel);
214 if (!err)
215 wdev->channel = channel;
216
217 return err;
Johannes Bergcc1d2802012-05-16 23:50:20 +0200218 }
219
220 if (wdev->mesh_id_len)
221 return -EBUSY;
222
Johannes Bergcc1d2802012-05-16 23:50:20 +0200223 wdev->preset_chan = channel;
224 wdev->preset_chantype = channel_type;
225 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
233 if (WARN_ON(wdev->iftype != NL80211_IFTYPE_MESH_POINT))
234 return;
235
236 nl80211_send_new_peer_candidate(wiphy_to_dev(wdev->wiphy), dev,
237 macaddr, ie, ie_len, gfp);
238}
239EXPORT_SYMBOL(cfg80211_notify_new_peer_candidate);
240
Johannes Berg29cbe682010-12-03 09:20:44 +0100241static 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->ops->leave_mesh(&rdev->wiphy, dev);
Michal Kaziorf4489eb2012-06-29 12:46:58 +0200259 if (!err) {
Johannes Berg29cbe682010-12-03 09:20:44 +0100260 wdev->mesh_id_len = 0;
Michal Kaziorf4489eb2012-06-29 12:46:58 +0200261 wdev->channel = NULL;
262 }
263
Johannes Berg29cbe682010-12-03 09:20:44 +0100264 return err;
265}
266
267int cfg80211_leave_mesh(struct cfg80211_registered_device *rdev,
268 struct net_device *dev)
269{
270 struct wireless_dev *wdev = dev->ieee80211_ptr;
271 int err;
272
273 wdev_lock(wdev);
274 err = __cfg80211_leave_mesh(rdev, dev);
275 wdev_unlock(wdev);
276
277 return err;
278}