Merge branch 'master' of git://git.kernel.org/pub/scm/linux/kernel/git/linville/wirel...
[linux-2.6.git] / net / wireless / mesh.c
1 #include <linux/ieee80211.h>
2 #include <net/cfg80211.h>
3 #include "nl80211.h"
4 #include "core.h"
5
6 /* Default values, timeouts in ms */
7 #define MESH_TTL                31
8 #define MESH_DEFAULT_ELEMENT_TTL 31
9 #define MESH_MAX_RETR           3
10 #define MESH_RET_T              100
11 #define MESH_CONF_T             100
12 #define MESH_HOLD_T             100
13
14 #define MESH_PATH_TIMEOUT       5000
15
16 /*
17  * Minimum interval between two consecutive PREQs originated by the same
18  * interface
19  */
20 #define MESH_PREQ_MIN_INT       10
21 #define MESH_DIAM_TRAVERSAL_TIME 50
22
23 /*
24  * A path will be refreshed if it is used PATH_REFRESH_TIME milliseconds
25  * before timing out.  This way it will remain ACTIVE and no data frames
26  * will be unnecessarily held in the pending queue.
27  */
28 #define MESH_PATH_REFRESH_TIME                  1000
29 #define MESH_MIN_DISCOVERY_TIMEOUT (2 * MESH_DIAM_TRAVERSAL_TIME)
30
31 /* Default maximum number of established plinks per interface */
32 #define MESH_MAX_ESTAB_PLINKS   32
33
34 #define MESH_MAX_PREQ_RETRIES   4
35
36
37 const struct mesh_config default_mesh_config = {
38         .dot11MeshRetryTimeout = MESH_RET_T,
39         .dot11MeshConfirmTimeout = MESH_CONF_T,
40         .dot11MeshHoldingTimeout = MESH_HOLD_T,
41         .dot11MeshMaxRetries = MESH_MAX_RETR,
42         .dot11MeshTTL = MESH_TTL,
43         .element_ttl = MESH_DEFAULT_ELEMENT_TTL,
44         .auto_open_plinks = true,
45         .dot11MeshMaxPeerLinks = MESH_MAX_ESTAB_PLINKS,
46         .dot11MeshHWMPactivePathTimeout = MESH_PATH_TIMEOUT,
47         .dot11MeshHWMPpreqMinInterval = MESH_PREQ_MIN_INT,
48         .dot11MeshHWMPnetDiameterTraversalTime = MESH_DIAM_TRAVERSAL_TIME,
49         .dot11MeshHWMPmaxPREQretries = MESH_MAX_PREQ_RETRIES,
50         .path_refresh_time = MESH_PATH_REFRESH_TIME,
51         .min_discovery_timeout = MESH_MIN_DISCOVERY_TIMEOUT,
52 };
53
54 const struct mesh_setup default_mesh_setup = {
55         .path_sel_proto = IEEE80211_PATH_PROTOCOL_HWMP,
56         .path_metric = IEEE80211_PATH_METRIC_AIRTIME,
57         .ie = NULL,
58         .ie_len = 0,
59         .is_secure = false,
60 };
61
62 int __cfg80211_join_mesh(struct cfg80211_registered_device *rdev,
63                          struct net_device *dev,
64                          const struct mesh_setup *setup,
65                          const struct mesh_config *conf)
66 {
67         struct wireless_dev *wdev = dev->ieee80211_ptr;
68         int err;
69
70         BUILD_BUG_ON(IEEE80211_MAX_SSID_LEN != IEEE80211_MAX_MESH_ID_LEN);
71
72         ASSERT_WDEV_LOCK(wdev);
73
74         if (dev->ieee80211_ptr->iftype != NL80211_IFTYPE_MESH_POINT)
75                 return -EOPNOTSUPP;
76
77         if (!(rdev->wiphy.flags & WIPHY_FLAG_MESH_AUTH) &&
78               setup->is_secure)
79                 return -EOPNOTSUPP;
80
81         if (wdev->mesh_id_len)
82                 return -EALREADY;
83
84         if (!setup->mesh_id_len)
85                 return -EINVAL;
86
87         if (!rdev->ops->join_mesh)
88                 return -EOPNOTSUPP;
89
90         err = rdev->ops->join_mesh(&rdev->wiphy, dev, conf, setup);
91         if (!err) {
92                 memcpy(wdev->ssid, setup->mesh_id, setup->mesh_id_len);
93                 wdev->mesh_id_len = setup->mesh_id_len;
94         }
95
96         return err;
97 }
98
99 int cfg80211_join_mesh(struct cfg80211_registered_device *rdev,
100                        struct net_device *dev,
101                        const struct mesh_setup *setup,
102                        const struct mesh_config *conf)
103 {
104         struct wireless_dev *wdev = dev->ieee80211_ptr;
105         int err;
106
107         wdev_lock(wdev);
108         err = __cfg80211_join_mesh(rdev, dev, setup, conf);
109         wdev_unlock(wdev);
110
111         return err;
112 }
113
114 void cfg80211_notify_new_peer_candidate(struct net_device *dev,
115                 const u8 *macaddr, const u8* ie, u8 ie_len, gfp_t gfp)
116 {
117         struct wireless_dev *wdev = dev->ieee80211_ptr;
118
119         if (WARN_ON(wdev->iftype != NL80211_IFTYPE_MESH_POINT))
120                 return;
121
122         nl80211_send_new_peer_candidate(wiphy_to_dev(wdev->wiphy), dev,
123                         macaddr, ie, ie_len, gfp);
124 }
125 EXPORT_SYMBOL(cfg80211_notify_new_peer_candidate);
126
127 static int __cfg80211_leave_mesh(struct cfg80211_registered_device *rdev,
128                                  struct net_device *dev)
129 {
130         struct wireless_dev *wdev = dev->ieee80211_ptr;
131         int err;
132
133         ASSERT_WDEV_LOCK(wdev);
134
135         if (dev->ieee80211_ptr->iftype != NL80211_IFTYPE_MESH_POINT)
136                 return -EOPNOTSUPP;
137
138         if (!rdev->ops->leave_mesh)
139                 return -EOPNOTSUPP;
140
141         if (!wdev->mesh_id_len)
142                 return -ENOTCONN;
143
144         err = rdev->ops->leave_mesh(&rdev->wiphy, dev);
145         if (!err)
146                 wdev->mesh_id_len = 0;
147         return err;
148 }
149
150 int cfg80211_leave_mesh(struct cfg80211_registered_device *rdev,
151                         struct net_device *dev)
152 {
153         struct wireless_dev *wdev = dev->ieee80211_ptr;
154         int err;
155
156         wdev_lock(wdev);
157         err = __cfg80211_leave_mesh(rdev, dev);
158         wdev_unlock(wdev);
159
160         return err;
161 }