xref: /linux/net/wireless/mesh.c (revision 800c5eb7b5eba6cb2a32738d763fd59f0fbcdde4)
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 /*
27  * A path will be refreshed if it is used PATH_REFRESH_TIME milliseconds
28  * before timing out.  This way it will remain ACTIVE and no data frames
29  * will be unnecessarily held in the pending queue.
30  */
31 #define MESH_PATH_REFRESH_TIME			1000
32 #define MESH_MIN_DISCOVERY_TIMEOUT (2 * MESH_DIAM_TRAVERSAL_TIME)
33 
34 /* Default maximum number of established plinks per interface */
35 #define MESH_MAX_ESTAB_PLINKS	32
36 
37 #define MESH_MAX_PREQ_RETRIES	4
38 
39 
40 const struct mesh_config default_mesh_config = {
41 	.dot11MeshRetryTimeout = MESH_RET_T,
42 	.dot11MeshConfirmTimeout = MESH_CONF_T,
43 	.dot11MeshHoldingTimeout = MESH_HOLD_T,
44 	.dot11MeshMaxRetries = MESH_MAX_RETR,
45 	.dot11MeshTTL = MESH_TTL,
46 	.element_ttl = MESH_DEFAULT_ELEMENT_TTL,
47 	.auto_open_plinks = true,
48 	.dot11MeshMaxPeerLinks = MESH_MAX_ESTAB_PLINKS,
49 	.dot11MeshHWMPactivePathTimeout = MESH_PATH_TIMEOUT,
50 	.dot11MeshHWMPpreqMinInterval = MESH_PREQ_MIN_INT,
51 	.dot11MeshHWMPperrMinInterval = MESH_PERR_MIN_INT,
52 	.dot11MeshHWMPnetDiameterTraversalTime = MESH_DIAM_TRAVERSAL_TIME,
53 	.dot11MeshHWMPmaxPREQretries = MESH_MAX_PREQ_RETRIES,
54 	.path_refresh_time = MESH_PATH_REFRESH_TIME,
55 	.min_discovery_timeout = MESH_MIN_DISCOVERY_TIMEOUT,
56 	.dot11MeshHWMPRannInterval = MESH_RANN_INTERVAL,
57 	.dot11MeshGateAnnouncementProtocol = false,
58 	.dot11MeshForwarding = true,
59 };
60 
61 const struct mesh_setup default_mesh_setup = {
62 	.path_sel_proto = IEEE80211_PATH_PROTOCOL_HWMP,
63 	.path_metric = IEEE80211_PATH_METRIC_AIRTIME,
64 	.ie = NULL,
65 	.ie_len = 0,
66 	.is_secure = false,
67 };
68 
69 int __cfg80211_join_mesh(struct cfg80211_registered_device *rdev,
70 			 struct net_device *dev,
71 			 const struct mesh_setup *setup,
72 			 const struct mesh_config *conf)
73 {
74 	struct wireless_dev *wdev = dev->ieee80211_ptr;
75 	int err;
76 
77 	BUILD_BUG_ON(IEEE80211_MAX_SSID_LEN != IEEE80211_MAX_MESH_ID_LEN);
78 
79 	ASSERT_WDEV_LOCK(wdev);
80 
81 	if (dev->ieee80211_ptr->iftype != NL80211_IFTYPE_MESH_POINT)
82 		return -EOPNOTSUPP;
83 
84 	if (!(rdev->wiphy.flags & WIPHY_FLAG_MESH_AUTH) &&
85 	      setup->is_secure)
86 		return -EOPNOTSUPP;
87 
88 	if (wdev->mesh_id_len)
89 		return -EALREADY;
90 
91 	if (!setup->mesh_id_len)
92 		return -EINVAL;
93 
94 	if (!rdev->ops->join_mesh)
95 		return -EOPNOTSUPP;
96 
97 	err = rdev->ops->join_mesh(&rdev->wiphy, dev, conf, setup);
98 	if (!err) {
99 		memcpy(wdev->ssid, setup->mesh_id, setup->mesh_id_len);
100 		wdev->mesh_id_len = setup->mesh_id_len;
101 	}
102 
103 	return err;
104 }
105 
106 int cfg80211_join_mesh(struct cfg80211_registered_device *rdev,
107 		       struct net_device *dev,
108 		       const struct mesh_setup *setup,
109 		       const struct mesh_config *conf)
110 {
111 	struct wireless_dev *wdev = dev->ieee80211_ptr;
112 	int err;
113 
114 	wdev_lock(wdev);
115 	err = __cfg80211_join_mesh(rdev, dev, setup, conf);
116 	wdev_unlock(wdev);
117 
118 	return err;
119 }
120 
121 void cfg80211_notify_new_peer_candidate(struct net_device *dev,
122 		const u8 *macaddr, const u8* ie, u8 ie_len, gfp_t gfp)
123 {
124 	struct wireless_dev *wdev = dev->ieee80211_ptr;
125 
126 	if (WARN_ON(wdev->iftype != NL80211_IFTYPE_MESH_POINT))
127 		return;
128 
129 	nl80211_send_new_peer_candidate(wiphy_to_dev(wdev->wiphy), dev,
130 			macaddr, ie, ie_len, gfp);
131 }
132 EXPORT_SYMBOL(cfg80211_notify_new_peer_candidate);
133 
134 static int __cfg80211_leave_mesh(struct cfg80211_registered_device *rdev,
135 				 struct net_device *dev)
136 {
137 	struct wireless_dev *wdev = dev->ieee80211_ptr;
138 	int err;
139 
140 	ASSERT_WDEV_LOCK(wdev);
141 
142 	if (dev->ieee80211_ptr->iftype != NL80211_IFTYPE_MESH_POINT)
143 		return -EOPNOTSUPP;
144 
145 	if (!rdev->ops->leave_mesh)
146 		return -EOPNOTSUPP;
147 
148 	if (!wdev->mesh_id_len)
149 		return -ENOTCONN;
150 
151 	err = rdev->ops->leave_mesh(&rdev->wiphy, dev);
152 	if (!err)
153 		wdev->mesh_id_len = 0;
154 	return err;
155 }
156 
157 int cfg80211_leave_mesh(struct cfg80211_registered_device *rdev,
158 			struct net_device *dev)
159 {
160 	struct wireless_dev *wdev = dev->ieee80211_ptr;
161 	int err;
162 
163 	wdev_lock(wdev);
164 	err = __cfg80211_leave_mesh(rdev, dev);
165 	wdev_unlock(wdev);
166 
167 	return err;
168 }
169