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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
Johannes Berg29cbe682010-12-03 09:20:44 +010017
18/*
19 * Minimum interval between two consecutive PREQs originated by the same
20 * interface
21 */
22#define MESH_PREQ_MIN_INT 10
Thomas Pedersendca7e942011-11-24 17:15:24 -080023#define MESH_PERR_MIN_INT 100
Johannes Berg29cbe682010-12-03 09:20:44 +010024#define MESH_DIAM_TRAVERSAL_TIME 50
25
Ashok Nagarajan55335132012-02-28 17:04:08 -080026#define MESH_RSSI_THRESHOLD 0
27
Johannes Berg29cbe682010-12-03 09:20:44 +010028/*
29 * A path will be refreshed if it is used PATH_REFRESH_TIME milliseconds
30 * before timing out. This way it will remain ACTIVE and no data frames
31 * will be unnecessarily held in the pending queue.
32 */
33#define MESH_PATH_REFRESH_TIME 1000
34#define MESH_MIN_DISCOVERY_TIMEOUT (2 * MESH_DIAM_TRAVERSAL_TIME)
35
36/* Default maximum number of established plinks per interface */
37#define MESH_MAX_ESTAB_PLINKS 32
38
39#define MESH_MAX_PREQ_RETRIES 4
40
Javier Cardonad299a1f2012-03-31 11:31:33 -070041#define MESH_SYNC_NEIGHBOR_OFFSET_MAX 50
Johannes Berg29cbe682010-12-03 09:20:44 +010042
43const struct mesh_config default_mesh_config = {
44 .dot11MeshRetryTimeout = MESH_RET_T,
45 .dot11MeshConfirmTimeout = MESH_CONF_T,
46 .dot11MeshHoldingTimeout = MESH_HOLD_T,
47 .dot11MeshMaxRetries = MESH_MAX_RETR,
48 .dot11MeshTTL = MESH_TTL,
49 .element_ttl = MESH_DEFAULT_ELEMENT_TTL,
50 .auto_open_plinks = true,
51 .dot11MeshMaxPeerLinks = MESH_MAX_ESTAB_PLINKS,
Javier Cardonad299a1f2012-03-31 11:31:33 -070052 .dot11MeshNbrOffsetMaxNeighbor = MESH_SYNC_NEIGHBOR_OFFSET_MAX,
Johannes Berg29cbe682010-12-03 09:20:44 +010053 .dot11MeshHWMPactivePathTimeout = MESH_PATH_TIMEOUT,
54 .dot11MeshHWMPpreqMinInterval = MESH_PREQ_MIN_INT,
Thomas Pedersendca7e942011-11-24 17:15:24 -080055 .dot11MeshHWMPperrMinInterval = MESH_PERR_MIN_INT,
Johannes Berg29cbe682010-12-03 09:20:44 +010056 .dot11MeshHWMPnetDiameterTraversalTime = MESH_DIAM_TRAVERSAL_TIME,
57 .dot11MeshHWMPmaxPREQretries = MESH_MAX_PREQ_RETRIES,
58 .path_refresh_time = MESH_PATH_REFRESH_TIME,
59 .min_discovery_timeout = MESH_MIN_DISCOVERY_TIMEOUT,
Javier Cardona0507e152011-08-09 16:45:10 -070060 .dot11MeshHWMPRannInterval = MESH_RANN_INTERVAL,
Javier Cardona16dd7262011-08-09 16:45:11 -070061 .dot11MeshGateAnnouncementProtocol = false,
Chun-Yeow Yeoh94f90652012-01-21 01:02:16 +080062 .dot11MeshForwarding = true,
Ashok Nagarajan55335132012-02-28 17:04:08 -080063 .rssi_threshold = MESH_RSSI_THRESHOLD,
Ashok Nagarajan70c33ea2012-04-30 14:20:32 -070064 .ht_opmode = IEEE80211_HT_OP_MODE_PROTECTION_NONHT_MIXED,
Johannes Berg29cbe682010-12-03 09:20:44 +010065};
66
Javier Cardonac80d5452010-12-16 17:37:49 -080067const struct mesh_setup default_mesh_setup = {
Johannes Bergcc1d2802012-05-16 23:50:20 +020068 /* cfg80211_join_mesh() will pick a channel if needed */
69 .channel = NULL,
70 .channel_type = NL80211_CHAN_NO_HT,
Javier Cardonad299a1f2012-03-31 11:31:33 -070071 .sync_method = IEEE80211_SYNC_METHOD_NEIGHBOR_OFFSET,
Javier Cardonac80d5452010-12-16 17:37:49 -080072 .path_sel_proto = IEEE80211_PATH_PROTOCOL_HWMP,
73 .path_metric = IEEE80211_PATH_METRIC_AIRTIME,
Javier Cardona581a8b02011-04-07 15:08:27 -070074 .ie = NULL,
75 .ie_len = 0,
Javier Cardona5cff5e02011-04-07 15:08:29 -070076 .is_secure = false,
Javier Cardonac80d5452010-12-16 17:37:49 -080077};
Johannes Berg29cbe682010-12-03 09:20:44 +010078
79int __cfg80211_join_mesh(struct cfg80211_registered_device *rdev,
80 struct net_device *dev,
Johannes Bergcc1d2802012-05-16 23:50:20 +020081 struct mesh_setup *setup,
Johannes Berg29cbe682010-12-03 09:20:44 +010082 const struct mesh_config *conf)
83{
84 struct wireless_dev *wdev = dev->ieee80211_ptr;
Johannes Berg29cbe682010-12-03 09:20:44 +010085 int err;
86
87 BUILD_BUG_ON(IEEE80211_MAX_SSID_LEN != IEEE80211_MAX_MESH_ID_LEN);
88
89 ASSERT_WDEV_LOCK(wdev);
90
91 if (dev->ieee80211_ptr->iftype != NL80211_IFTYPE_MESH_POINT)
92 return -EOPNOTSUPP;
93
Javier Cardona15d5dda2011-04-07 15:08:28 -070094 if (!(rdev->wiphy.flags & WIPHY_FLAG_MESH_AUTH) &&
95 setup->is_secure)
96 return -EOPNOTSUPP;
97
Johannes Berg29cbe682010-12-03 09:20:44 +010098 if (wdev->mesh_id_len)
99 return -EALREADY;
100
Javier Cardonac80d5452010-12-16 17:37:49 -0800101 if (!setup->mesh_id_len)
Johannes Berg29cbe682010-12-03 09:20:44 +0100102 return -EINVAL;
103
104 if (!rdev->ops->join_mesh)
105 return -EOPNOTSUPP;
106
Johannes Bergcc1d2802012-05-16 23:50:20 +0200107 if (!setup->channel) {
108 /* if no channel explicitly given, use preset channel */
109 setup->channel = wdev->preset_chan;
110 setup->channel_type = wdev->preset_chantype;
111 }
112
113 if (!setup->channel) {
114 /* if we don't have that either, use the first usable channel */
115 enum ieee80211_band band;
116
117 for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
118 struct ieee80211_supported_band *sband;
119 struct ieee80211_channel *chan;
120 int i;
121
122 sband = rdev->wiphy.bands[band];
123 if (!sband)
124 continue;
125
126 for (i = 0; i < sband->n_channels; i++) {
127 chan = &sband->channels[i];
128 if (chan->flags & (IEEE80211_CHAN_NO_IBSS |
129 IEEE80211_CHAN_PASSIVE_SCAN |
130 IEEE80211_CHAN_DISABLED |
131 IEEE80211_CHAN_RADAR))
132 continue;
133 setup->channel = chan;
134 break;
135 }
136
137 if (setup->channel)
138 break;
139 }
140
141 /* no usable channel ... */
142 if (!setup->channel)
143 return -EINVAL;
144
145 setup->channel_type = NL80211_CHAN_NO_HT;
146 }
147
148 if (!cfg80211_can_beacon_sec_chan(&rdev->wiphy, setup->channel,
149 setup->channel_type))
150 return -EINVAL;
151
Javier Cardonac80d5452010-12-16 17:37:49 -0800152 err = rdev->ops->join_mesh(&rdev->wiphy, dev, conf, setup);
Johannes Berg29cbe682010-12-03 09:20:44 +0100153 if (!err) {
Javier Cardonac80d5452010-12-16 17:37:49 -0800154 memcpy(wdev->ssid, setup->mesh_id, setup->mesh_id_len);
155 wdev->mesh_id_len = setup->mesh_id_len;
Johannes Berg29cbe682010-12-03 09:20:44 +0100156 }
157
158 return err;
159}
160
161int cfg80211_join_mesh(struct cfg80211_registered_device *rdev,
162 struct net_device *dev,
Johannes Bergcc1d2802012-05-16 23:50:20 +0200163 struct mesh_setup *setup,
Johannes Berg29cbe682010-12-03 09:20:44 +0100164 const struct mesh_config *conf)
165{
166 struct wireless_dev *wdev = dev->ieee80211_ptr;
167 int err;
168
169 wdev_lock(wdev);
Javier Cardonac80d5452010-12-16 17:37:49 -0800170 err = __cfg80211_join_mesh(rdev, dev, setup, conf);
Johannes Berg29cbe682010-12-03 09:20:44 +0100171 wdev_unlock(wdev);
172
173 return err;
174}
175
Johannes Bergcc1d2802012-05-16 23:50:20 +0200176int cfg80211_set_mesh_freq(struct cfg80211_registered_device *rdev,
177 struct wireless_dev *wdev, int freq,
178 enum nl80211_channel_type channel_type)
179{
180 struct ieee80211_channel *channel;
181
Johannes Berge8c9bd52012-06-06 08:18:22 +0200182 channel = rdev_freq_to_chan(rdev, freq, channel_type);
183 if (!channel || !cfg80211_can_beacon_sec_chan(&rdev->wiphy,
184 channel,
185 channel_type)) {
186 return -EINVAL;
187 }
188
Johannes Bergcc1d2802012-05-16 23:50:20 +0200189 /*
190 * Workaround for libertas (only!), it puts the interface
191 * into mesh mode but doesn't implement join_mesh. Instead,
192 * it is configured via sysfs and then joins the mesh when
193 * you set the channel. Note that the libertas mesh isn't
194 * compatible with 802.11 mesh.
195 */
Johannes Berge8c9bd52012-06-06 08:18:22 +0200196 if (rdev->ops->libertas_set_mesh_channel) {
197 if (channel_type != NL80211_CHAN_NO_HT)
198 return -EINVAL;
Johannes Bergcc1d2802012-05-16 23:50:20 +0200199
200 if (!netif_running(wdev->netdev))
201 return -ENETDOWN;
Johannes Berge8c9bd52012-06-06 08:18:22 +0200202 return rdev->ops->libertas_set_mesh_channel(&rdev->wiphy,
203 wdev->netdev,
204 channel);
Johannes Bergcc1d2802012-05-16 23:50:20 +0200205 }
206
207 if (wdev->mesh_id_len)
208 return -EBUSY;
209
Johannes Bergcc1d2802012-05-16 23:50:20 +0200210 wdev->preset_chan = channel;
211 wdev->preset_chantype = channel_type;
212 return 0;
213}
214
Javier Cardonac93b5e72011-04-07 15:08:34 -0700215void cfg80211_notify_new_peer_candidate(struct net_device *dev,
216 const u8 *macaddr, const u8* ie, u8 ie_len, gfp_t gfp)
217{
218 struct wireless_dev *wdev = dev->ieee80211_ptr;
219
220 if (WARN_ON(wdev->iftype != NL80211_IFTYPE_MESH_POINT))
221 return;
222
223 nl80211_send_new_peer_candidate(wiphy_to_dev(wdev->wiphy), dev,
224 macaddr, ie, ie_len, gfp);
225}
226EXPORT_SYMBOL(cfg80211_notify_new_peer_candidate);
227
Johannes Berg29cbe682010-12-03 09:20:44 +0100228static int __cfg80211_leave_mesh(struct cfg80211_registered_device *rdev,
229 struct net_device *dev)
230{
231 struct wireless_dev *wdev = dev->ieee80211_ptr;
232 int err;
233
234 ASSERT_WDEV_LOCK(wdev);
235
236 if (dev->ieee80211_ptr->iftype != NL80211_IFTYPE_MESH_POINT)
237 return -EOPNOTSUPP;
238
239 if (!rdev->ops->leave_mesh)
240 return -EOPNOTSUPP;
241
242 if (!wdev->mesh_id_len)
243 return -ENOTCONN;
244
245 err = rdev->ops->leave_mesh(&rdev->wiphy, dev);
246 if (!err)
247 wdev->mesh_id_len = 0;
248 return err;
249}
250
251int cfg80211_leave_mesh(struct cfg80211_registered_device *rdev,
252 struct net_device *dev)
253{
254 struct wireless_dev *wdev = dev->ieee80211_ptr;
255 int err;
256
257 wdev_lock(wdev);
258 err = __cfg80211_leave_mesh(rdev, dev);
259 wdev_unlock(wdev);
260
261 return err;
262}