Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net
[linux-2.6.git] / net / wireless / mesh.c
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 };
59
60 const struct mesh_setup default_mesh_setup = {
61         .path_sel_proto = IEEE80211_PATH_PROTOCOL_HWMP,
62         .path_metric = IEEE80211_PATH_METRIC_AIRTIME,
63         .ie = NULL,
64         .ie_len = 0,
65         .is_secure = false,
66 };
67
68 int __cfg80211_join_mesh(struct cfg80211_registered_device *rdev,
69                          struct net_device *dev,
70                          const struct mesh_setup *setup,
71                          const struct mesh_config *conf)
72 {
73         struct wireless_dev *wdev = dev->ieee80211_ptr;
74         int err;
75
76         BUILD_BUG_ON(IEEE80211_MAX_SSID_LEN != IEEE80211_MAX_MESH_ID_LEN);
77
78         ASSERT_WDEV_LOCK(wdev);
79
80         if (dev->ieee80211_ptr->iftype != NL80211_IFTYPE_MESH_POINT)
81                 return -EOPNOTSUPP;
82
83         if (!(rdev->wiphy.flags & WIPHY_FLAG_MESH_AUTH) &&
84               setup->is_secure)
85                 return -EOPNOTSUPP;
86
87         if (wdev->mesh_id_len)
88                 return -EALREADY;
89
90         if (!setup->mesh_id_len)
91                 return -EINVAL;
92
93         if (!rdev->ops->join_mesh)
94                 return -EOPNOTSUPP;
95
96         err = rdev->ops->join_mesh(&rdev->wiphy, dev, conf, setup);
97         if (!err) {
98                 memcpy(wdev->ssid, setup->mesh_id, setup->mesh_id_len);
99                 wdev->mesh_id_len = setup->mesh_id_len;
100         }
101
102         return err;
103 }
104
105 int cfg80211_join_mesh(struct cfg80211_registered_device *rdev,
106                        struct net_device *dev,
107                        const struct mesh_setup *setup,
108                        const struct mesh_config *conf)
109 {
110         struct wireless_dev *wdev = dev->ieee80211_ptr;
111         int err;
112
113         wdev_lock(wdev);
114         err = __cfg80211_join_mesh(rdev, dev, setup, conf);
115         wdev_unlock(wdev);
116
117         return err;
118 }
119
120 void cfg80211_notify_new_peer_candidate(struct net_device *dev,
121                 const u8 *macaddr, const u8* ie, u8 ie_len, gfp_t gfp)
122 {
123         struct wireless_dev *wdev = dev->ieee80211_ptr;
124
125         if (WARN_ON(wdev->iftype != NL80211_IFTYPE_MESH_POINT))
126                 return;
127
128         nl80211_send_new_peer_candidate(wiphy_to_dev(wdev->wiphy), dev,
129                         macaddr, ie, ie_len, gfp);
130 }
131 EXPORT_SYMBOL(cfg80211_notify_new_peer_candidate);
132
133 static int __cfg80211_leave_mesh(struct cfg80211_registered_device *rdev,
134                                  struct net_device *dev)
135 {
136         struct wireless_dev *wdev = dev->ieee80211_ptr;
137         int err;
138
139         ASSERT_WDEV_LOCK(wdev);
140
141         if (dev->ieee80211_ptr->iftype != NL80211_IFTYPE_MESH_POINT)
142                 return -EOPNOTSUPP;
143
144         if (!rdev->ops->leave_mesh)
145                 return -EOPNOTSUPP;
146
147         if (!wdev->mesh_id_len)
148                 return -ENOTCONN;
149
150         err = rdev->ops->leave_mesh(&rdev->wiphy, dev);
151         if (!err)
152                 wdev->mesh_id_len = 0;
153         return err;
154 }
155
156 int cfg80211_leave_mesh(struct cfg80211_registered_device *rdev,
157                         struct net_device *dev)
158 {
159         struct wireless_dev *wdev = dev->ieee80211_ptr;
160         int err;
161
162         wdev_lock(wdev);
163         err = __cfg80211_leave_mesh(rdev, dev);
164         wdev_unlock(wdev);
165
166         return err;
167 }