xref: /linux/net/wireless/mesh.c (revision 26b0d14106954ae46d2f4f7eec3481828a210f7d)
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 
18 /*
19  * Minimum interval between two consecutive PREQs originated by the same
20  * interface
21  */
22 #define MESH_PREQ_MIN_INT	10
23 #define MESH_PERR_MIN_INT	100
24 #define MESH_DIAM_TRAVERSAL_TIME 50
25 
26 #define MESH_RSSI_THRESHOLD	0
27 
28 /*
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 
41 #define MESH_SYNC_NEIGHBOR_OFFSET_MAX 50
42 
43 const 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,
52 	.dot11MeshNbrOffsetMaxNeighbor = MESH_SYNC_NEIGHBOR_OFFSET_MAX,
53 	.dot11MeshHWMPactivePathTimeout = MESH_PATH_TIMEOUT,
54 	.dot11MeshHWMPpreqMinInterval = MESH_PREQ_MIN_INT,
55 	.dot11MeshHWMPperrMinInterval = MESH_PERR_MIN_INT,
56 	.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,
60 	.dot11MeshHWMPRannInterval = MESH_RANN_INTERVAL,
61 	.dot11MeshGateAnnouncementProtocol = false,
62 	.dot11MeshForwarding = true,
63 	.rssi_threshold = MESH_RSSI_THRESHOLD,
64 	.ht_opmode = IEEE80211_HT_OP_MODE_PROTECTION_NONHT_MIXED,
65 };
66 
67 const struct mesh_setup default_mesh_setup = {
68 	.sync_method = IEEE80211_SYNC_METHOD_NEIGHBOR_OFFSET,
69 	.path_sel_proto = IEEE80211_PATH_PROTOCOL_HWMP,
70 	.path_metric = IEEE80211_PATH_METRIC_AIRTIME,
71 	.ie = NULL,
72 	.ie_len = 0,
73 	.is_secure = false,
74 };
75 
76 int __cfg80211_join_mesh(struct cfg80211_registered_device *rdev,
77 			 struct net_device *dev,
78 			 const struct mesh_setup *setup,
79 			 const struct mesh_config *conf)
80 {
81 	struct wireless_dev *wdev = dev->ieee80211_ptr;
82 	int err;
83 
84 	BUILD_BUG_ON(IEEE80211_MAX_SSID_LEN != IEEE80211_MAX_MESH_ID_LEN);
85 
86 	ASSERT_WDEV_LOCK(wdev);
87 
88 	if (dev->ieee80211_ptr->iftype != NL80211_IFTYPE_MESH_POINT)
89 		return -EOPNOTSUPP;
90 
91 	if (!(rdev->wiphy.flags & WIPHY_FLAG_MESH_AUTH) &&
92 	      setup->is_secure)
93 		return -EOPNOTSUPP;
94 
95 	if (wdev->mesh_id_len)
96 		return -EALREADY;
97 
98 	if (!setup->mesh_id_len)
99 		return -EINVAL;
100 
101 	if (!rdev->ops->join_mesh)
102 		return -EOPNOTSUPP;
103 
104 	err = rdev->ops->join_mesh(&rdev->wiphy, dev, conf, setup);
105 	if (!err) {
106 		memcpy(wdev->ssid, setup->mesh_id, setup->mesh_id_len);
107 		wdev->mesh_id_len = setup->mesh_id_len;
108 	}
109 
110 	return err;
111 }
112 
113 int cfg80211_join_mesh(struct cfg80211_registered_device *rdev,
114 		       struct net_device *dev,
115 		       const struct mesh_setup *setup,
116 		       const struct mesh_config *conf)
117 {
118 	struct wireless_dev *wdev = dev->ieee80211_ptr;
119 	int err;
120 
121 	wdev_lock(wdev);
122 	err = __cfg80211_join_mesh(rdev, dev, setup, conf);
123 	wdev_unlock(wdev);
124 
125 	return err;
126 }
127 
128 void cfg80211_notify_new_peer_candidate(struct net_device *dev,
129 		const u8 *macaddr, const u8* ie, u8 ie_len, gfp_t gfp)
130 {
131 	struct wireless_dev *wdev = dev->ieee80211_ptr;
132 
133 	if (WARN_ON(wdev->iftype != NL80211_IFTYPE_MESH_POINT))
134 		return;
135 
136 	nl80211_send_new_peer_candidate(wiphy_to_dev(wdev->wiphy), dev,
137 			macaddr, ie, ie_len, gfp);
138 }
139 EXPORT_SYMBOL(cfg80211_notify_new_peer_candidate);
140 
141 static int __cfg80211_leave_mesh(struct cfg80211_registered_device *rdev,
142 				 struct net_device *dev)
143 {
144 	struct wireless_dev *wdev = dev->ieee80211_ptr;
145 	int err;
146 
147 	ASSERT_WDEV_LOCK(wdev);
148 
149 	if (dev->ieee80211_ptr->iftype != NL80211_IFTYPE_MESH_POINT)
150 		return -EOPNOTSUPP;
151 
152 	if (!rdev->ops->leave_mesh)
153 		return -EOPNOTSUPP;
154 
155 	if (!wdev->mesh_id_len)
156 		return -ENOTCONN;
157 
158 	err = rdev->ops->leave_mesh(&rdev->wiphy, dev);
159 	if (!err)
160 		wdev->mesh_id_len = 0;
161 	return err;
162 }
163 
164 int cfg80211_leave_mesh(struct cfg80211_registered_device *rdev,
165 			struct net_device *dev)
166 {
167 	struct wireless_dev *wdev = dev->ieee80211_ptr;
168 	int err;
169 
170 	wdev_lock(wdev);
171 	err = __cfg80211_leave_mesh(rdev, dev);
172 	wdev_unlock(wdev);
173 
174 	return err;
175 }
176