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/*
* Copyright 2002-2005, Instant802 Networks, Inc.
* Copyright 2005-2006, Devicescape Software, Inc.
* Copyright (c) 2006 Jiri Benc <jbenc@suse.cz>
* Copyright 2008, Johannes Berg <johannes@sipsolutions.net>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*/
#include <linux/kernel.h>
#include <linux/if_arp.h>
#include <linux/netdevice.h>
#include <linux/rtnetlink.h>
#include <net/mac80211.h>
#include "ieee80211_i.h"
#include "sta_info.h"
#include "debugfs_netdev.h"
#include "mesh.h"
/*
* Called when the netdev is removed or, by the code below, before
* the interface type changes.
*/
static void ieee80211_teardown_sdata(struct net_device *dev)
{
struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
struct ieee80211_local *local = sdata->local;
struct beacon_data *beacon;
struct sk_buff *skb;
int flushed;
int i;
/* free extra data */
ieee80211_free_keys(sdata);
ieee80211_debugfs_remove_netdev(sdata);
for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++)
__skb_queue_purge(&sdata->fragments[i].skb_list);
sdata->fragment_next = 0;
switch (sdata->vif.type) {
case NL80211_IFTYPE_AP:
beacon = sdata->u.ap.beacon;
rcu_assign_pointer(sdata->u.ap.beacon, NULL);
synchronize_rcu();
kfree(beacon);
while ((skb = skb_dequeue(&sdata->u.ap.ps_bc_buf))) {
local->total_ps_buffered--;
dev_kfree_skb(skb);
}
break;
case NL80211_IFTYPE_MESH_POINT:
if (ieee80211_vif_is_mesh(&sdata->vif))
mesh_rmc_free(sdata);
break;
case NL80211_IFTYPE_STATION:
case NL80211_IFTYPE_ADHOC:
kfree(sdata->u.sta.extra_ie);
kfree(sdata->u.sta.assocreq_ies);
kfree(sdata->u.sta.assocresp_ies);
kfree_skb(sdata->u.sta.probe_resp);
break;
case NL80211_IFTYPE_WDS:
case NL80211_IFTYPE_AP_VLAN:
case NL80211_IFTYPE_MONITOR:
break;
case NL80211_IFTYPE_UNSPECIFIED:
case __NL80211_IFTYPE_AFTER_LAST:
BUG();
break;
}
flushed = sta_info_flush(local, sdata);
WARN_ON(flushed);
}
/*
* Helper function to initialise an interface to a specific type.
*/
static void ieee80211_setup_sdata(struct ieee80211_sub_if_data *sdata,
enum nl80211_iftype type)
{
/* clear type-dependent union */
memset(&sdata->u, 0, sizeof(sdata->u));
/* and set some type-dependent values */
sdata->vif.type = type;
/* only monitor differs */
sdata->dev->type = ARPHRD_ETHER;
switch (type) {
case NL80211_IFTYPE_AP:
skb_queue_head_init(&sdata->u.ap.ps_bc_buf);
INIT_LIST_HEAD(&sdata->u.ap.vlans);
break;
case NL80211_IFTYPE_STATION:
case NL80211_IFTYPE_ADHOC:
ieee80211_sta_setup_sdata(sdata);
break;
case NL80211_IFTYPE_MESH_POINT:
if (ieee80211_vif_is_mesh(&sdata->vif))
ieee80211_mesh_init_sdata(sdata);
break;
case NL80211_IFTYPE_MONITOR:
sdata->dev->type = ARPHRD_IEEE80211_RADIOTAP;
sdata->dev->hard_start_xmit = ieee80211_monitor_start_xmit;
sdata->u.mntr_flags = MONITOR_FLAG_CONTROL |
MONITOR_FLAG_OTHER_BSS;
break;
case NL80211_IFTYPE_WDS:
case NL80211_IFTYPE_AP_VLAN:
break;
case NL80211_IFTYPE_UNSPECIFIED:
case __NL80211_IFTYPE_AFTER_LAST:
BUG();
break;
}
ieee80211_debugfs_add_netdev(sdata);
}
int ieee80211_if_change_type(struct ieee80211_sub_if_data *sdata,
enum nl80211_iftype type)
{
ASSERT_RTNL();
if (type == sdata->vif.type)
return 0;
/*
* We could, here, on changes between IBSS/STA/MESH modes,
* invoke an MLME function instead that disassociates etc.
* and goes into the requested mode.
*/
if (netif_running(sdata->dev))
return -EBUSY;
/* Purge and reset type-dependent state. */
ieee80211_teardown_sdata(sdata->dev);
ieee80211_setup_sdata(sdata, type);
/* reset some values that shouldn't be kept across type changes */
sdata->bss_conf.basic_rates =
ieee80211_mandatory_rates(sdata->local,
sdata->local->hw.conf.channel->band);
sdata->drop_unencrypted = 0;
return 0;
}
int ieee80211_if_add(struct ieee80211_local *local, const char *name,
struct net_device **new_dev, enum nl80211_iftype type,
struct vif_params *params)
{
struct net_device *ndev;
struct ieee80211_sub_if_data *sdata = NULL;
int ret, i;
ASSERT_RTNL();
ndev = alloc_netdev(sizeof(*sdata) + local->hw.vif_data_size,
name, ieee80211_if_setup);
if (!ndev)
return -ENOMEM;
ndev->needed_headroom = local->tx_headroom +
4*6 /* four MAC addresses */
+ 2 + 2 + 2 + 2 /* ctl, dur, seq, qos */
+ 6 /* mesh */
+ 8 /* rfc1042/bridge tunnel */
- ETH_HLEN /* ethernet hard_header_len */
+ IEEE80211_ENCRYPT_HEADROOM;
ndev->needed_tailroom = IEEE80211_ENCRYPT_TAILROOM;
ret = dev_alloc_name(ndev, ndev->name);
if (ret < 0)
goto fail;
memcpy(ndev->dev_addr, local->hw.wiphy->perm_addr, ETH_ALEN);
SET_NETDEV_DEV(ndev, wiphy_dev(local->hw.wiphy));
/* don't use IEEE80211_DEV_TO_SUB_IF because it checks too much */
sdata = netdev_priv(ndev);
ndev->ieee80211_ptr = &sdata->wdev;
/* initialise type-independent data */
sdata->wdev.wiphy = local->hw.wiphy;
sdata->local = local;
sdata->dev = ndev;
for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++)
skb_queue_head_init(&sdata->fragments[i].skb_list);
INIT_LIST_HEAD(&sdata->key_list);
sdata->force_unicast_rateidx = -1;
sdata->max_ratectrl_rateidx = -1;
/* setup type-dependent data */
ieee80211_setup_sdata(sdata, type);
ret = register_netdevice(ndev);
if (ret)
goto fail;
ndev->uninit = ieee80211_teardown_sdata;
if (ieee80211_vif_is_mesh(&sdata->vif) &&
params && params->mesh_id_len)
ieee80211_sdata_set_mesh_id(sdata,
params->mesh_id_len,
params->mesh_id);
list_add_tail_rcu(&sdata->list, &local->interfaces);
if (new_dev)
*new_dev = ndev;
return 0;
fail:
free_netdev(ndev);
return ret;
}
void ieee80211_if_remove(struct ieee80211_sub_if_data *sdata)
{
ASSERT_RTNL();
list_del_rcu(&sdata->list);
synchronize_rcu();
unregister_netdevice(sdata->dev);
}
/*
* Remove all interfaces, may only be called at hardware unregistration
* time because it doesn't do RCU-safe list removals.
*/
void ieee80211_remove_interfaces(struct ieee80211_local *local)
{
struct ieee80211_sub_if_data *sdata, *tmp;
ASSERT_RTNL();
list_for_each_entry_safe(sdata, tmp, &local->interfaces, list) {
list_del(&sdata->list);
unregister_netdevice(sdata->dev);
}
}
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