Commit | Line | Data |
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f0706e82 JB |
1 | /* |
2 | * Copyright 2002-2005, Instant802 Networks, Inc. | |
3 | * Copyright 2005-2006, Devicescape Software, Inc. | |
4 | * Copyright (c) 2006 Jiri Benc <jbenc@suse.cz> | |
75636525 | 5 | * Copyright 2008, Johannes Berg <johannes@sipsolutions.net> |
f0706e82 JB |
6 | * |
7 | * This program is free software; you can redistribute it and/or modify | |
8 | * it under the terms of the GNU General Public License version 2 as | |
9 | * published by the Free Software Foundation. | |
10 | */ | |
11 | #include <linux/kernel.h> | |
12 | #include <linux/if_arp.h> | |
13 | #include <linux/netdevice.h> | |
14 | #include <linux/rtnetlink.h> | |
15 | #include <net/mac80211.h> | |
16 | #include "ieee80211_i.h" | |
17 | #include "sta_info.h" | |
e9f207f0 | 18 | #include "debugfs_netdev.h" |
ee385855 | 19 | #include "mesh.h" |
f0706e82 | 20 | |
75636525 JB |
21 | /* |
22 | * Called when the netdev is removed or, by the code below, before | |
23 | * the interface type changes. | |
24 | */ | |
25 | static void ieee80211_teardown_sdata(struct net_device *dev) | |
f0706e82 | 26 | { |
75636525 JB |
27 | struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); |
28 | struct ieee80211_local *local = sdata->local; | |
29 | struct beacon_data *beacon; | |
30 | struct sk_buff *skb; | |
31 | int flushed; | |
f0706e82 JB |
32 | int i; |
33 | ||
75636525 JB |
34 | /* free extra data */ |
35 | ieee80211_free_keys(sdata); | |
36 | ||
aee14ceb JM |
37 | ieee80211_debugfs_remove_netdev(sdata); |
38 | ||
f0706e82 | 39 | for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++) |
75636525 JB |
40 | __skb_queue_purge(&sdata->fragments[i].skb_list); |
41 | sdata->fragment_next = 0; | |
11a843b7 | 42 | |
75636525 | 43 | switch (sdata->vif.type) { |
05c914fe | 44 | case NL80211_IFTYPE_AP: |
75636525 JB |
45 | beacon = sdata->u.ap.beacon; |
46 | rcu_assign_pointer(sdata->u.ap.beacon, NULL); | |
47 | synchronize_rcu(); | |
48 | kfree(beacon); | |
3e122be0 | 49 | |
75636525 JB |
50 | while ((skb = skb_dequeue(&sdata->u.ap.ps_bc_buf))) { |
51 | local->total_ps_buffered--; | |
52 | dev_kfree_skb(skb); | |
53 | } | |
54 | ||
55 | break; | |
05c914fe | 56 | case NL80211_IFTYPE_MESH_POINT: |
75636525 | 57 | if (ieee80211_vif_is_mesh(&sdata->vif)) |
f698d856 | 58 | mesh_rmc_free(sdata); |
472dbc45 | 59 | break; |
05c914fe JB |
60 | case NL80211_IFTYPE_STATION: |
61 | case NL80211_IFTYPE_ADHOC: | |
75636525 JB |
62 | kfree(sdata->u.sta.extra_ie); |
63 | kfree(sdata->u.sta.assocreq_ies); | |
64 | kfree(sdata->u.sta.assocresp_ies); | |
65 | kfree_skb(sdata->u.sta.probe_resp); | |
66 | break; | |
05c914fe JB |
67 | case NL80211_IFTYPE_WDS: |
68 | case NL80211_IFTYPE_AP_VLAN: | |
69 | case NL80211_IFTYPE_MONITOR: | |
75636525 | 70 | break; |
05c914fe JB |
71 | case NL80211_IFTYPE_UNSPECIFIED: |
72 | case __NL80211_IFTYPE_AFTER_LAST: | |
75636525 JB |
73 | BUG(); |
74 | break; | |
75 | } | |
76 | ||
77 | flushed = sta_info_flush(local, sdata); | |
78 | WARN_ON(flushed); | |
f0706e82 JB |
79 | } |
80 | ||
75636525 JB |
81 | /* |
82 | * Helper function to initialise an interface to a specific type. | |
83 | */ | |
84 | static void ieee80211_setup_sdata(struct ieee80211_sub_if_data *sdata, | |
05c914fe | 85 | enum nl80211_iftype type) |
f0706e82 | 86 | { |
75636525 JB |
87 | /* clear type-dependent union */ |
88 | memset(&sdata->u, 0, sizeof(sdata->u)); | |
89 | ||
90 | /* and set some type-dependent values */ | |
91 | sdata->vif.type = type; | |
92 | ||
93 | /* only monitor differs */ | |
94 | sdata->dev->type = ARPHRD_ETHER; | |
95 | ||
96 | switch (type) { | |
05c914fe | 97 | case NL80211_IFTYPE_AP: |
75636525 JB |
98 | skb_queue_head_init(&sdata->u.ap.ps_bc_buf); |
99 | INIT_LIST_HEAD(&sdata->u.ap.vlans); | |
100 | break; | |
05c914fe JB |
101 | case NL80211_IFTYPE_STATION: |
102 | case NL80211_IFTYPE_ADHOC: | |
9c6bd790 | 103 | ieee80211_sta_setup_sdata(sdata); |
472dbc45 | 104 | break; |
05c914fe | 105 | case NL80211_IFTYPE_MESH_POINT: |
75636525 JB |
106 | if (ieee80211_vif_is_mesh(&sdata->vif)) |
107 | ieee80211_mesh_init_sdata(sdata); | |
108 | break; | |
05c914fe | 109 | case NL80211_IFTYPE_MONITOR: |
75636525 JB |
110 | sdata->dev->type = ARPHRD_IEEE80211_RADIOTAP; |
111 | sdata->dev->hard_start_xmit = ieee80211_monitor_start_xmit; | |
112 | sdata->u.mntr_flags = MONITOR_FLAG_CONTROL | | |
113 | MONITOR_FLAG_OTHER_BSS; | |
114 | break; | |
05c914fe JB |
115 | case NL80211_IFTYPE_WDS: |
116 | case NL80211_IFTYPE_AP_VLAN: | |
75636525 | 117 | break; |
05c914fe JB |
118 | case NL80211_IFTYPE_UNSPECIFIED: |
119 | case __NL80211_IFTYPE_AFTER_LAST: | |
75636525 JB |
120 | BUG(); |
121 | break; | |
122 | } | |
123 | ||
124 | ieee80211_debugfs_add_netdev(sdata); | |
125 | } | |
126 | ||
f3947e2d | 127 | int ieee80211_if_change_type(struct ieee80211_sub_if_data *sdata, |
05c914fe | 128 | enum nl80211_iftype type) |
75636525 | 129 | { |
f3947e2d JB |
130 | ASSERT_RTNL(); |
131 | ||
132 | if (type == sdata->vif.type) | |
133 | return 0; | |
134 | ||
135 | /* | |
136 | * We could, here, on changes between IBSS/STA/MESH modes, | |
137 | * invoke an MLME function instead that disassociates etc. | |
138 | * and goes into the requested mode. | |
139 | */ | |
140 | ||
141 | if (netif_running(sdata->dev)) | |
142 | return -EBUSY; | |
143 | ||
75636525 JB |
144 | /* Purge and reset type-dependent state. */ |
145 | ieee80211_teardown_sdata(sdata->dev); | |
146 | ieee80211_setup_sdata(sdata, type); | |
147 | ||
148 | /* reset some values that shouldn't be kept across type changes */ | |
96dd22ac JB |
149 | sdata->bss_conf.basic_rates = |
150 | ieee80211_mandatory_rates(sdata->local, | |
151 | sdata->local->hw.conf.channel->band); | |
75636525 | 152 | sdata->drop_unencrypted = 0; |
f3947e2d JB |
153 | |
154 | return 0; | |
f0706e82 JB |
155 | } |
156 | ||
3e122be0 | 157 | int ieee80211_if_add(struct ieee80211_local *local, const char *name, |
05c914fe | 158 | struct net_device **new_dev, enum nl80211_iftype type, |
ee385855 | 159 | struct vif_params *params) |
f0706e82 JB |
160 | { |
161 | struct net_device *ndev; | |
f0706e82 | 162 | struct ieee80211_sub_if_data *sdata = NULL; |
75636525 | 163 | int ret, i; |
f0706e82 JB |
164 | |
165 | ASSERT_RTNL(); | |
75636525 | 166 | |
32bfd35d | 167 | ndev = alloc_netdev(sizeof(*sdata) + local->hw.vif_data_size, |
f0706e82 JB |
168 | name, ieee80211_if_setup); |
169 | if (!ndev) | |
170 | return -ENOMEM; | |
171 | ||
f3994ece JB |
172 | ndev->needed_headroom = local->tx_headroom + |
173 | 4*6 /* four MAC addresses */ | |
174 | + 2 + 2 + 2 + 2 /* ctl, dur, seq, qos */ | |
175 | + 6 /* mesh */ | |
176 | + 8 /* rfc1042/bridge tunnel */ | |
177 | - ETH_HLEN /* ethernet hard_header_len */ | |
178 | + IEEE80211_ENCRYPT_HEADROOM; | |
179 | ndev->needed_tailroom = IEEE80211_ENCRYPT_TAILROOM; | |
180 | ||
f0706e82 JB |
181 | ret = dev_alloc_name(ndev, ndev->name); |
182 | if (ret < 0) | |
183 | goto fail; | |
184 | ||
185 | memcpy(ndev->dev_addr, local->hw.wiphy->perm_addr, ETH_ALEN); | |
f0706e82 JB |
186 | SET_NETDEV_DEV(ndev, wiphy_dev(local->hw.wiphy)); |
187 | ||
3e122be0 JB |
188 | /* don't use IEEE80211_DEV_TO_SUB_IF because it checks too much */ |
189 | sdata = netdev_priv(ndev); | |
f0706e82 | 190 | ndev->ieee80211_ptr = &sdata->wdev; |
75636525 JB |
191 | |
192 | /* initialise type-independent data */ | |
f0706e82 | 193 | sdata->wdev.wiphy = local->hw.wiphy; |
f0706e82 | 194 | sdata->local = local; |
75636525 JB |
195 | sdata->dev = ndev; |
196 | ||
197 | for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++) | |
198 | skb_queue_head_init(&sdata->fragments[i].skb_list); | |
199 | ||
200 | INIT_LIST_HEAD(&sdata->key_list); | |
201 | ||
202 | sdata->force_unicast_rateidx = -1; | |
203 | sdata->max_ratectrl_rateidx = -1; | |
204 | ||
205 | /* setup type-dependent data */ | |
206 | ieee80211_setup_sdata(sdata, type); | |
f0706e82 JB |
207 | |
208 | ret = register_netdevice(ndev); | |
209 | if (ret) | |
210 | goto fail; | |
211 | ||
75636525 | 212 | ndev->uninit = ieee80211_teardown_sdata; |
f0706e82 | 213 | |
902acc78 JB |
214 | if (ieee80211_vif_is_mesh(&sdata->vif) && |
215 | params && params->mesh_id_len) | |
472dbc45 JB |
216 | ieee80211_sdata_set_mesh_id(sdata, |
217 | params->mesh_id_len, | |
218 | params->mesh_id); | |
ee385855 | 219 | |
79010420 JB |
220 | list_add_tail_rcu(&sdata->list, &local->interfaces); |
221 | ||
f0706e82 JB |
222 | if (new_dev) |
223 | *new_dev = ndev; | |
f0706e82 | 224 | |
f0706e82 JB |
225 | return 0; |
226 | ||
75636525 | 227 | fail: |
f0706e82 JB |
228 | free_netdev(ndev); |
229 | return ret; | |
230 | } | |
231 | ||
f698d856 | 232 | void ieee80211_if_remove(struct ieee80211_sub_if_data *sdata) |
f0706e82 | 233 | { |
f0706e82 | 234 | ASSERT_RTNL(); |
11a843b7 | 235 | |
75636525 JB |
236 | list_del_rcu(&sdata->list); |
237 | synchronize_rcu(); | |
f698d856 | 238 | unregister_netdevice(sdata->dev); |
f0706e82 JB |
239 | } |
240 | ||
75636525 JB |
241 | /* |
242 | * Remove all interfaces, may only be called at hardware unregistration | |
243 | * time because it doesn't do RCU-safe list removals. | |
244 | */ | |
245 | void ieee80211_remove_interfaces(struct ieee80211_local *local) | |
f0706e82 | 246 | { |
75636525 | 247 | struct ieee80211_sub_if_data *sdata, *tmp; |
f0706e82 JB |
248 | |
249 | ASSERT_RTNL(); | |
250 | ||
75636525 JB |
251 | list_for_each_entry_safe(sdata, tmp, &local->interfaces, list) { |
252 | list_del(&sdata->list); | |
253 | unregister_netdevice(sdata->dev); | |
f0706e82 | 254 | } |
f0706e82 | 255 | } |