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linux-sg2042/net/mac80211/iface.c

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/*
* Copyright 2002-2005, Instant802 Networks, Inc.
* Copyright 2005-2006, Devicescape Software, Inc.
* Copyright (c) 2006 Jiri Benc <jbenc@suse.cz>
*
* 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"
void ieee80211_if_sdata_init(struct ieee80211_sub_if_data *sdata)
{
int i;
/* Default values for sub-interface parameters */
sdata->drop_unencrypted = 0;
for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++)
skb_queue_head_init(&sdata->fragments[i].skb_list);
INIT_LIST_HEAD(&sdata->key_list);
}
static void ieee80211_if_sdata_deinit(struct ieee80211_sub_if_data *sdata)
{
int i;
for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++) {
__skb_queue_purge(&sdata->fragments[i].skb_list);
}
}
/* Must be called with rtnl lock held. */
int ieee80211_if_add(struct net_device *dev, const char *name,
struct net_device **new_dev, int type,
struct vif_params *params)
{
struct net_device *ndev;
struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
struct ieee80211_sub_if_data *sdata = NULL;
int ret;
ASSERT_RTNL();
ndev = alloc_netdev(sizeof(*sdata) + local->hw.vif_data_size,
name, ieee80211_if_setup);
if (!ndev)
return -ENOMEM;
ret = dev_alloc_name(ndev, ndev->name);
if (ret < 0)
goto fail;
memcpy(ndev->dev_addr, local->hw.wiphy->perm_addr, ETH_ALEN);
ndev->base_addr = dev->base_addr;
ndev->irq = dev->irq;
ndev->mem_start = dev->mem_start;
ndev->mem_end = dev->mem_end;
SET_NETDEV_DEV(ndev, wiphy_dev(local->hw.wiphy));
sdata = IEEE80211_DEV_TO_SUB_IF(ndev);
ndev->ieee80211_ptr = &sdata->wdev;
sdata->wdev.wiphy = local->hw.wiphy;
sdata->vif.type = IEEE80211_IF_TYPE_AP;
sdata->dev = ndev;
sdata->local = local;
ieee80211_if_sdata_init(sdata);
ret = register_netdevice(ndev);
if (ret)
goto fail;
ieee80211_debugfs_add_netdev(sdata);
ieee80211_if_set_type(ndev, type);
if (ieee80211_vif_is_mesh(&sdata->vif) &&
params && params->mesh_id_len)
ieee80211_if_sta_set_mesh_id(&sdata->u.sta,
params->mesh_id_len,
params->mesh_id);
/* we're under RTNL so all this is fine */
if (unlikely(local->reg_state == IEEE80211_DEV_UNREGISTERED)) {
__ieee80211_if_del(local, sdata);
return -ENODEV;
}
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_set_type(struct net_device *dev, int type)
{
struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
int oldtype = sdata->vif.type;
/*
* We need to call this function on the master interface
* which already has a hard_start_xmit routine assigned
* which must not be changed.
*/
if (dev != sdata->local->mdev)
dev->hard_start_xmit = ieee80211_subif_start_xmit;
/*
* Called even when register_netdevice fails, it would
* oops if assigned before initialising the rest.
*/
dev->uninit = ieee80211_if_reinit;
/* most have no BSS pointer */
sdata->bss = NULL;
sdata->vif.type = type;
sdata->basic_rates = 0;
switch (type) {
case IEEE80211_IF_TYPE_WDS:
/* nothing special */
break;
case IEEE80211_IF_TYPE_VLAN:
sdata->u.vlan.ap = NULL;
break;
case IEEE80211_IF_TYPE_AP:
sdata->u.ap.force_unicast_rateidx = -1;
sdata->u.ap.max_ratectrl_rateidx = -1;
skb_queue_head_init(&sdata->u.ap.ps_bc_buf);
sdata->bss = &sdata->u.ap;
INIT_LIST_HEAD(&sdata->u.ap.vlans);
break;
case IEEE80211_IF_TYPE_MESH_POINT:
case IEEE80211_IF_TYPE_STA:
case IEEE80211_IF_TYPE_IBSS: {
struct ieee80211_sub_if_data *msdata;
struct ieee80211_if_sta *ifsta;
ifsta = &sdata->u.sta;
INIT_WORK(&ifsta->work, ieee80211_sta_work);
setup_timer(&ifsta->timer, ieee80211_sta_timer,
(unsigned long) sdata);
skb_queue_head_init(&ifsta->skb_queue);
ifsta->capab = WLAN_CAPABILITY_ESS;
ifsta->auth_algs = IEEE80211_AUTH_ALG_OPEN |
IEEE80211_AUTH_ALG_SHARED_KEY;
ifsta->flags |= IEEE80211_STA_CREATE_IBSS |
IEEE80211_STA_WMM_ENABLED |
IEEE80211_STA_AUTO_BSSID_SEL |
IEEE80211_STA_AUTO_CHANNEL_SEL;
msdata = IEEE80211_DEV_TO_SUB_IF(sdata->local->mdev);
sdata->bss = &msdata->u.ap;
if (ieee80211_vif_is_mesh(&sdata->vif))
ieee80211_mesh_init_sdata(sdata);
break;
}
case IEEE80211_IF_TYPE_MNTR:
dev->type = ARPHRD_IEEE80211_RADIOTAP;
dev->hard_start_xmit = ieee80211_monitor_start_xmit;
sdata->u.mntr_flags = MONITOR_FLAG_CONTROL |
MONITOR_FLAG_OTHER_BSS;
break;
default:
printk(KERN_WARNING "%s: %s: Unknown interface type 0x%x",
dev->name, __func__, type);
}
ieee80211_debugfs_change_if_type(sdata, oldtype);
}
/* Must be called with rtnl lock held. */
void ieee80211_if_reinit(struct net_device *dev)
{
struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
struct sk_buff *skb;
int flushed;
ASSERT_RTNL();
ieee80211_free_keys(sdata);
ieee80211_if_sdata_deinit(sdata);
/* Need to handle mesh specially to allow eliding the function call */
if (ieee80211_vif_is_mesh(&sdata->vif))
mesh_rmc_free(dev);
switch (sdata->vif.type) {
case IEEE80211_IF_TYPE_INVALID:
/* cannot happen */
WARN_ON(1);
break;
case IEEE80211_IF_TYPE_AP: {
/* Remove all virtual interfaces that use this BSS
* as their sdata->bss */
struct ieee80211_sub_if_data *tsdata, *n;
struct beacon_data *beacon;
list_for_each_entry_safe(tsdata, n, &local->interfaces, list) {
if (tsdata != sdata && tsdata->bss == &sdata->u.ap) {
printk(KERN_DEBUG "%s: removing virtual "
"interface %s because its BSS interface"
" is being removed\n",
sdata->dev->name, tsdata->dev->name);
list_del_rcu(&tsdata->list);
/*
* We have lots of time and can afford
* to sync for each interface
*/
synchronize_rcu();
__ieee80211_if_del(local, tsdata);
}
}
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 IEEE80211_IF_TYPE_WDS:
/* nothing to do */
break;
case IEEE80211_IF_TYPE_MESH_POINT:
case IEEE80211_IF_TYPE_STA:
case IEEE80211_IF_TYPE_IBSS:
kfree(sdata->u.sta.extra_ie);
sdata->u.sta.extra_ie = NULL;
kfree(sdata->u.sta.assocreq_ies);
sdata->u.sta.assocreq_ies = NULL;
kfree(sdata->u.sta.assocresp_ies);
sdata->u.sta.assocresp_ies = NULL;
if (sdata->u.sta.probe_resp) {
dev_kfree_skb(sdata->u.sta.probe_resp);
sdata->u.sta.probe_resp = NULL;
}
break;
case IEEE80211_IF_TYPE_MNTR:
dev->type = ARPHRD_ETHER;
break;
case IEEE80211_IF_TYPE_VLAN:
sdata->u.vlan.ap = NULL;
break;
}
flushed = sta_info_flush(local, sdata);
WARN_ON(flushed);
memset(&sdata->u, 0, sizeof(sdata->u));
ieee80211_if_sdata_init(sdata);
}
/* Must be called with rtnl lock held. */
void __ieee80211_if_del(struct ieee80211_local *local,
struct ieee80211_sub_if_data *sdata)
{
struct net_device *dev = sdata->dev;
ieee80211_debugfs_remove_netdev(sdata);
unregister_netdevice(dev);
/* Except master interface, the net_device will be freed by
* net_device->destructor (i. e. ieee80211_if_free). */
}
/* Must be called with rtnl lock held. */
int ieee80211_if_remove(struct net_device *dev, const char *name, int id)
{
struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
struct ieee80211_sub_if_data *sdata, *n;
ASSERT_RTNL();
list_for_each_entry_safe(sdata, n, &local->interfaces, list) {
if ((sdata->vif.type == id || id == -1) &&
strcmp(name, sdata->dev->name) == 0 &&
sdata->dev != local->mdev) {
list_del_rcu(&sdata->list);
synchronize_rcu();
__ieee80211_if_del(local, sdata);
return 0;
}
}
return -ENODEV;
}
void ieee80211_if_free(struct net_device *dev)
{
struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
ieee80211_if_sdata_deinit(sdata);
free_netdev(dev);
}
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