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
52const 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
82const 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
96int __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 ieee80211_band band;
132
133		for (band = 0; band < IEEE80211_NUM_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
191int 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
206int 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
241int __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
268int 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}
280