mac80211: Let userspace enable and configure vendor specific path selection.
[linux-2.6.git] / net / wireless / mesh.c
1 #include <linux/ieee80211.h>
2 #include <net/cfg80211.h>
3 #include "core.h"
4
5 /* Default values, timeouts in ms */
6 #define MESH_TTL                31
7 #define MESH_DEFAULT_ELEMENT_TTL 31
8 #define MESH_MAX_RETR           3
9 #define MESH_RET_T              100
10 #define MESH_CONF_T             100
11 #define MESH_HOLD_T             100
12
13 #define MESH_PATH_TIMEOUT       5000
14
15 /*
16  * Minimum interval between two consecutive PREQs originated by the same
17  * interface
18  */
19 #define MESH_PREQ_MIN_INT       10
20 #define MESH_DIAM_TRAVERSAL_TIME 50
21
22 /*
23  * A path will be refreshed if it is used PATH_REFRESH_TIME milliseconds
24  * before timing out.  This way it will remain ACTIVE and no data frames
25  * will be unnecessarily held in the pending queue.
26  */
27 #define MESH_PATH_REFRESH_TIME                  1000
28 #define MESH_MIN_DISCOVERY_TIMEOUT (2 * MESH_DIAM_TRAVERSAL_TIME)
29
30 /* Default maximum number of established plinks per interface */
31 #define MESH_MAX_ESTAB_PLINKS   32
32
33 #define MESH_MAX_PREQ_RETRIES   4
34
35
36 const struct mesh_config default_mesh_config = {
37         .dot11MeshRetryTimeout = MESH_RET_T,
38         .dot11MeshConfirmTimeout = MESH_CONF_T,
39         .dot11MeshHoldingTimeout = MESH_HOLD_T,
40         .dot11MeshMaxRetries = MESH_MAX_RETR,
41         .dot11MeshTTL = MESH_TTL,
42         .element_ttl = MESH_DEFAULT_ELEMENT_TTL,
43         .auto_open_plinks = true,
44         .dot11MeshMaxPeerLinks = MESH_MAX_ESTAB_PLINKS,
45         .dot11MeshHWMPactivePathTimeout = MESH_PATH_TIMEOUT,
46         .dot11MeshHWMPpreqMinInterval = MESH_PREQ_MIN_INT,
47         .dot11MeshHWMPnetDiameterTraversalTime = MESH_DIAM_TRAVERSAL_TIME,
48         .dot11MeshHWMPmaxPREQretries = MESH_MAX_PREQ_RETRIES,
49         .path_refresh_time = MESH_PATH_REFRESH_TIME,
50         .min_discovery_timeout = MESH_MIN_DISCOVERY_TIMEOUT,
51 };
52
53 const struct mesh_setup default_mesh_setup = {
54         .path_sel_proto = IEEE80211_PATH_PROTOCOL_HWMP,
55         .path_metric = IEEE80211_PATH_METRIC_AIRTIME,
56         .vendor_ie = NULL,
57         .vendor_ie_len = 0,
58 };
59
60 int __cfg80211_join_mesh(struct cfg80211_registered_device *rdev,
61                          struct net_device *dev,
62                          const struct mesh_setup *setup,
63                          const struct mesh_config *conf)
64 {
65         struct wireless_dev *wdev = dev->ieee80211_ptr;
66         int err;
67
68         BUILD_BUG_ON(IEEE80211_MAX_SSID_LEN != IEEE80211_MAX_MESH_ID_LEN);
69
70         ASSERT_WDEV_LOCK(wdev);
71
72         if (dev->ieee80211_ptr->iftype != NL80211_IFTYPE_MESH_POINT)
73                 return -EOPNOTSUPP;
74
75         if (wdev->mesh_id_len)
76                 return -EALREADY;
77
78         if (!setup->mesh_id_len)
79                 return -EINVAL;
80
81         if (!rdev->ops->join_mesh)
82                 return -EOPNOTSUPP;
83
84         err = rdev->ops->join_mesh(&rdev->wiphy, dev, conf, setup);
85         if (!err) {
86                 memcpy(wdev->ssid, setup->mesh_id, setup->mesh_id_len);
87                 wdev->mesh_id_len = setup->mesh_id_len;
88         }
89
90         return err;
91 }
92
93 int cfg80211_join_mesh(struct cfg80211_registered_device *rdev,
94                        struct net_device *dev,
95                        const struct mesh_setup *setup,
96                        const struct mesh_config *conf)
97 {
98         struct wireless_dev *wdev = dev->ieee80211_ptr;
99         int err;
100
101         wdev_lock(wdev);
102         err = __cfg80211_join_mesh(rdev, dev, setup, conf);
103         wdev_unlock(wdev);
104
105         return err;
106 }
107
108 static int __cfg80211_leave_mesh(struct cfg80211_registered_device *rdev,
109                                  struct net_device *dev)
110 {
111         struct wireless_dev *wdev = dev->ieee80211_ptr;
112         int err;
113
114         ASSERT_WDEV_LOCK(wdev);
115
116         if (dev->ieee80211_ptr->iftype != NL80211_IFTYPE_MESH_POINT)
117                 return -EOPNOTSUPP;
118
119         if (!rdev->ops->leave_mesh)
120                 return -EOPNOTSUPP;
121
122         if (!wdev->mesh_id_len)
123                 return -ENOTCONN;
124
125         err = rdev->ops->leave_mesh(&rdev->wiphy, dev);
126         if (!err)
127                 wdev->mesh_id_len = 0;
128         return err;
129 }
130
131 int cfg80211_leave_mesh(struct cfg80211_registered_device *rdev,
132                         struct net_device *dev)
133 {
134         struct wireless_dev *wdev = dev->ieee80211_ptr;
135         int err;
136
137         wdev_lock(wdev);
138         err = __cfg80211_leave_mesh(rdev, dev);
139         wdev_unlock(wdev);
140
141         return err;
142 }