![Johannes Berg](/assets/img/avatar_default.png)
For bluetooth 3, we will most likely not have a netdev for a virtual interface (sdata), so prepare for that by reducing the reliance on having a netdev. This patch moves the name and address fields into the sdata struct and uses them from there all over. Some work is needed to keep them sync'ed, but that's not a lot of work and in slow paths anyway. In doing so, this also reduces the number of pointer dereferences in many places, because of things like sdata->dev->dev_addr becoming sdata->vif.addr. Signed-off-by: Johannes Berg <johannes@sipsolutions.net> Signed-off-by: John W. Linville <linville@tuxdriver.com>
1004 lines
26 KiB
C
1004 lines
26 KiB
C
/*
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* Interface handling (except master interface)
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*
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* Copyright 2002-2005, Instant802 Networks, Inc.
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* Copyright 2005-2006, Devicescape Software, Inc.
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* Copyright (c) 2006 Jiri Benc <jbenc@suse.cz>
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* Copyright 2008, Johannes Berg <johannes@sipsolutions.net>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#include <linux/kernel.h>
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#include <linux/if_arp.h>
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#include <linux/netdevice.h>
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#include <linux/rtnetlink.h>
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#include <net/mac80211.h>
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#include "ieee80211_i.h"
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#include "sta_info.h"
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#include "debugfs_netdev.h"
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#include "mesh.h"
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#include "led.h"
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#include "driver-ops.h"
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/**
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* DOC: Interface list locking
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*
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* The interface list in each struct ieee80211_local is protected
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* three-fold:
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*
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* (1) modifications may only be done under the RTNL
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* (2) modifications and readers are protected against each other by
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* the iflist_mtx.
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* (3) modifications are done in an RCU manner so atomic readers
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* can traverse the list in RCU-safe blocks.
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*
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* As a consequence, reads (traversals) of the list can be protected
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* by either the RTNL, the iflist_mtx or RCU.
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*/
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static int ieee80211_change_mtu(struct net_device *dev, int new_mtu)
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{
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int meshhdrlen;
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struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
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meshhdrlen = (sdata->vif.type == NL80211_IFTYPE_MESH_POINT) ? 5 : 0;
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/* FIX: what would be proper limits for MTU?
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* This interface uses 802.3 frames. */
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if (new_mtu < 256 ||
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new_mtu > IEEE80211_MAX_DATA_LEN - 24 - 6 - meshhdrlen) {
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return -EINVAL;
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}
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#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
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printk(KERN_DEBUG "%s: setting MTU %d\n", dev->name, new_mtu);
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#endif /* CONFIG_MAC80211_VERBOSE_DEBUG */
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dev->mtu = new_mtu;
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return 0;
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}
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static int ieee80211_change_mac(struct net_device *dev, void *addr)
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{
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struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
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int ret;
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if (netif_running(dev))
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return -EBUSY;
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ret = eth_mac_addr(dev, addr);
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if (ret == 0)
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memcpy(sdata->vif.addr, addr, ETH_ALEN);
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return ret;
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}
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static inline int identical_mac_addr_allowed(int type1, int type2)
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{
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return type1 == NL80211_IFTYPE_MONITOR ||
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type2 == NL80211_IFTYPE_MONITOR ||
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(type1 == NL80211_IFTYPE_AP && type2 == NL80211_IFTYPE_WDS) ||
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(type1 == NL80211_IFTYPE_WDS &&
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(type2 == NL80211_IFTYPE_WDS ||
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type2 == NL80211_IFTYPE_AP)) ||
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(type1 == NL80211_IFTYPE_AP && type2 == NL80211_IFTYPE_AP_VLAN) ||
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(type1 == NL80211_IFTYPE_AP_VLAN &&
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(type2 == NL80211_IFTYPE_AP ||
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type2 == NL80211_IFTYPE_AP_VLAN));
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}
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static int ieee80211_open(struct net_device *dev)
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{
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struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
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struct ieee80211_sub_if_data *nsdata;
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struct ieee80211_local *local = sdata->local;
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struct sta_info *sta;
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struct ieee80211_if_init_conf conf;
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u32 changed = 0;
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int res;
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u32 hw_reconf_flags = 0;
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u8 null_addr[ETH_ALEN] = {0};
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/* fail early if user set an invalid address */
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if (compare_ether_addr(dev->dev_addr, null_addr) &&
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!is_valid_ether_addr(dev->dev_addr))
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return -EADDRNOTAVAIL;
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/* we hold the RTNL here so can safely walk the list */
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list_for_each_entry(nsdata, &local->interfaces, list) {
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struct net_device *ndev = nsdata->dev;
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if (ndev != dev && netif_running(ndev)) {
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/*
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* Allow only a single IBSS interface to be up at any
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* time. This is restricted because beacon distribution
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* cannot work properly if both are in the same IBSS.
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*
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* To remove this restriction we'd have to disallow them
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* from setting the same SSID on different IBSS interfaces
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* belonging to the same hardware. Then, however, we're
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* faced with having to adopt two different TSF timers...
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*/
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if (sdata->vif.type == NL80211_IFTYPE_ADHOC &&
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nsdata->vif.type == NL80211_IFTYPE_ADHOC)
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return -EBUSY;
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/*
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* The remaining checks are only performed for interfaces
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* with the same MAC address.
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*/
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if (compare_ether_addr(dev->dev_addr, ndev->dev_addr))
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continue;
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/*
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* check whether it may have the same address
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*/
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if (!identical_mac_addr_allowed(sdata->vif.type,
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nsdata->vif.type))
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return -ENOTUNIQ;
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/*
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* can only add VLANs to enabled APs
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*/
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if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
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nsdata->vif.type == NL80211_IFTYPE_AP)
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sdata->bss = &nsdata->u.ap;
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}
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}
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switch (sdata->vif.type) {
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case NL80211_IFTYPE_WDS:
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if (!is_valid_ether_addr(sdata->u.wds.remote_addr))
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return -ENOLINK;
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break;
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case NL80211_IFTYPE_AP_VLAN:
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if (!sdata->bss)
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return -ENOLINK;
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list_add(&sdata->u.vlan.list, &sdata->bss->vlans);
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break;
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case NL80211_IFTYPE_AP:
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sdata->bss = &sdata->u.ap;
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break;
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case NL80211_IFTYPE_MESH_POINT:
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if (!ieee80211_vif_is_mesh(&sdata->vif))
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break;
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/* mesh ifaces must set allmulti to forward mcast traffic */
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atomic_inc(&local->iff_allmultis);
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break;
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case NL80211_IFTYPE_STATION:
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case NL80211_IFTYPE_MONITOR:
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case NL80211_IFTYPE_ADHOC:
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/* no special treatment */
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break;
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case NL80211_IFTYPE_UNSPECIFIED:
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case __NL80211_IFTYPE_AFTER_LAST:
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/* cannot happen */
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WARN_ON(1);
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break;
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}
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if (local->open_count == 0) {
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res = drv_start(local);
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if (res)
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goto err_del_bss;
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/* we're brought up, everything changes */
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hw_reconf_flags = ~0;
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ieee80211_led_radio(local, true);
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}
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/*
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* Check all interfaces and copy the hopefully now-present
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* MAC address to those that have the special null one.
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*/
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list_for_each_entry(nsdata, &local->interfaces, list) {
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struct net_device *ndev = nsdata->dev;
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/*
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* No need to check netif_running since we do not allow
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* it to start up with this invalid address.
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*/
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if (compare_ether_addr(null_addr, ndev->dev_addr) == 0) {
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memcpy(ndev->dev_addr,
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local->hw.wiphy->perm_addr,
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ETH_ALEN);
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memcpy(ndev->perm_addr, ndev->dev_addr, ETH_ALEN);
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}
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}
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/*
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* Validate the MAC address for this device.
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*/
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if (!is_valid_ether_addr(dev->dev_addr)) {
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if (!local->open_count)
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drv_stop(local);
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return -EADDRNOTAVAIL;
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}
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switch (sdata->vif.type) {
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case NL80211_IFTYPE_AP_VLAN:
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/* no need to tell driver */
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break;
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case NL80211_IFTYPE_MONITOR:
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if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) {
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local->cooked_mntrs++;
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break;
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}
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/* must be before the call to ieee80211_configure_filter */
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local->monitors++;
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if (local->monitors == 1) {
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local->hw.conf.flags |= IEEE80211_CONF_MONITOR;
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hw_reconf_flags |= IEEE80211_CONF_CHANGE_MONITOR;
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}
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if (sdata->u.mntr_flags & MONITOR_FLAG_FCSFAIL)
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local->fif_fcsfail++;
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if (sdata->u.mntr_flags & MONITOR_FLAG_PLCPFAIL)
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local->fif_plcpfail++;
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if (sdata->u.mntr_flags & MONITOR_FLAG_CONTROL) {
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local->fif_control++;
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local->fif_pspoll++;
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}
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if (sdata->u.mntr_flags & MONITOR_FLAG_OTHER_BSS)
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local->fif_other_bss++;
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ieee80211_configure_filter(local);
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break;
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default:
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conf.vif = &sdata->vif;
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conf.type = sdata->vif.type;
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conf.mac_addr = sdata->vif.addr;
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res = drv_add_interface(local, &conf);
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if (res)
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goto err_stop;
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if (ieee80211_vif_is_mesh(&sdata->vif)) {
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local->fif_other_bss++;
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ieee80211_configure_filter(local);
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ieee80211_start_mesh(sdata);
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} else if (sdata->vif.type == NL80211_IFTYPE_AP) {
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local->fif_pspoll++;
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ieee80211_configure_filter(local);
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}
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changed |= ieee80211_reset_erp_info(sdata);
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ieee80211_bss_info_change_notify(sdata, changed);
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ieee80211_enable_keys(sdata);
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if (sdata->vif.type == NL80211_IFTYPE_STATION)
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netif_carrier_off(dev);
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else
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netif_carrier_on(dev);
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}
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if (sdata->vif.type == NL80211_IFTYPE_WDS) {
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/* Create STA entry for the WDS peer */
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sta = sta_info_alloc(sdata, sdata->u.wds.remote_addr,
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GFP_KERNEL);
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if (!sta) {
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res = -ENOMEM;
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goto err_del_interface;
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}
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/* no locking required since STA is not live yet */
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sta->flags |= WLAN_STA_AUTHORIZED;
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res = sta_info_insert(sta);
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if (res) {
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/* STA has been freed */
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goto err_del_interface;
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}
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}
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/*
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* set_multicast_list will be invoked by the networking core
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* which will check whether any increments here were done in
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* error and sync them down to the hardware as filter flags.
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*/
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if (sdata->flags & IEEE80211_SDATA_ALLMULTI)
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atomic_inc(&local->iff_allmultis);
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if (sdata->flags & IEEE80211_SDATA_PROMISC)
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atomic_inc(&local->iff_promiscs);
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hw_reconf_flags |= __ieee80211_recalc_idle(local);
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local->open_count++;
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if (hw_reconf_flags) {
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ieee80211_hw_config(local, hw_reconf_flags);
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/*
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* set default queue parameters so drivers don't
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* need to initialise the hardware if the hardware
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* doesn't start up with sane defaults
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*/
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ieee80211_set_wmm_default(sdata);
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}
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ieee80211_recalc_ps(local, -1);
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/*
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* ieee80211_sta_work is disabled while network interface
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* is down. Therefore, some configuration changes may not
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* yet be effective. Trigger execution of ieee80211_sta_work
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* to fix this.
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*/
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if (sdata->vif.type == NL80211_IFTYPE_STATION)
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ieee80211_queue_work(&local->hw, &sdata->u.mgd.work);
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netif_start_queue(dev);
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return 0;
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err_del_interface:
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drv_remove_interface(local, &conf);
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err_stop:
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if (!local->open_count)
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drv_stop(local);
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err_del_bss:
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sdata->bss = NULL;
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if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
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list_del(&sdata->u.vlan.list);
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return res;
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}
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static int ieee80211_stop(struct net_device *dev)
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{
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struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
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struct ieee80211_local *local = sdata->local;
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struct ieee80211_if_init_conf conf;
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struct sta_info *sta;
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unsigned long flags;
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struct sk_buff *skb, *tmp;
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u32 hw_reconf_flags = 0;
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int i;
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/*
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* Stop TX on this interface first.
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*/
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netif_stop_queue(dev);
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/*
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* Now delete all active aggregation sessions.
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*/
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rcu_read_lock();
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list_for_each_entry_rcu(sta, &local->sta_list, list) {
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if (sta->sdata == sdata)
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ieee80211_sta_tear_down_BA_sessions(sta);
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}
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rcu_read_unlock();
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/*
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* Remove all stations associated with this interface.
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*
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* This must be done before calling ops->remove_interface()
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* because otherwise we can later invoke ops->sta_notify()
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* whenever the STAs are removed, and that invalidates driver
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* assumptions about always getting a vif pointer that is valid
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* (because if we remove a STA after ops->remove_interface()
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* the driver will have removed the vif info already!)
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*
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* We could relax this and only unlink the stations from the
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* hash table and list but keep them on a per-sdata list that
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* will be inserted back again when the interface is brought
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* up again, but I don't currently see a use case for that,
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* except with WDS which gets a STA entry created when it is
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* brought up.
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*/
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sta_info_flush(local, sdata);
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/*
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* Don't count this interface for promisc/allmulti while it
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* is down. dev_mc_unsync() will invoke set_multicast_list
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* on the master interface which will sync these down to the
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* hardware as filter flags.
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*/
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if (sdata->flags & IEEE80211_SDATA_ALLMULTI)
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atomic_dec(&local->iff_allmultis);
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if (sdata->flags & IEEE80211_SDATA_PROMISC)
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atomic_dec(&local->iff_promiscs);
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if (sdata->vif.type == NL80211_IFTYPE_AP)
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local->fif_pspoll--;
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netif_addr_lock_bh(dev);
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spin_lock_bh(&local->filter_lock);
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__dev_addr_unsync(&local->mc_list, &local->mc_count,
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&dev->mc_list, &dev->mc_count);
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spin_unlock_bh(&local->filter_lock);
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netif_addr_unlock_bh(dev);
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ieee80211_configure_filter(local);
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del_timer_sync(&local->dynamic_ps_timer);
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cancel_work_sync(&local->dynamic_ps_enable_work);
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/* APs need special treatment */
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if (sdata->vif.type == NL80211_IFTYPE_AP) {
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struct ieee80211_sub_if_data *vlan, *tmpsdata;
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struct beacon_data *old_beacon = sdata->u.ap.beacon;
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/* remove beacon */
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rcu_assign_pointer(sdata->u.ap.beacon, NULL);
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synchronize_rcu();
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kfree(old_beacon);
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/* down all dependent devices, that is VLANs */
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list_for_each_entry_safe(vlan, tmpsdata, &sdata->u.ap.vlans,
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u.vlan.list)
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dev_close(vlan->dev);
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WARN_ON(!list_empty(&sdata->u.ap.vlans));
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}
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local->open_count--;
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switch (sdata->vif.type) {
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case NL80211_IFTYPE_AP_VLAN:
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list_del(&sdata->u.vlan.list);
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/* no need to tell driver */
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break;
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case NL80211_IFTYPE_MONITOR:
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if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) {
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local->cooked_mntrs--;
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break;
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}
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local->monitors--;
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if (local->monitors == 0) {
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local->hw.conf.flags &= ~IEEE80211_CONF_MONITOR;
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hw_reconf_flags |= IEEE80211_CONF_CHANGE_MONITOR;
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}
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if (sdata->u.mntr_flags & MONITOR_FLAG_FCSFAIL)
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local->fif_fcsfail--;
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if (sdata->u.mntr_flags & MONITOR_FLAG_PLCPFAIL)
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local->fif_plcpfail--;
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if (sdata->u.mntr_flags & MONITOR_FLAG_CONTROL) {
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local->fif_pspoll--;
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local->fif_control--;
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}
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if (sdata->u.mntr_flags & MONITOR_FLAG_OTHER_BSS)
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local->fif_other_bss--;
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ieee80211_configure_filter(local);
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break;
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case NL80211_IFTYPE_STATION:
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del_timer_sync(&sdata->u.mgd.chswitch_timer);
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del_timer_sync(&sdata->u.mgd.timer);
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del_timer_sync(&sdata->u.mgd.conn_mon_timer);
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del_timer_sync(&sdata->u.mgd.bcn_mon_timer);
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/*
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* If any of the timers fired while we waited for it, it will
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* have queued its work. Now the work will be running again
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* but will not rearm the timer again because it checks
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* whether the interface is running, which, at this point,
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* it no longer is.
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*/
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cancel_work_sync(&sdata->u.mgd.work);
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|
cancel_work_sync(&sdata->u.mgd.chswitch_work);
|
|
cancel_work_sync(&sdata->u.mgd.monitor_work);
|
|
cancel_work_sync(&sdata->u.mgd.beacon_loss_work);
|
|
|
|
/*
|
|
* When we get here, the interface is marked down.
|
|
* Call synchronize_rcu() to wait for the RX path
|
|
* should it be using the interface and enqueuing
|
|
* frames at this very time on another CPU.
|
|
*/
|
|
synchronize_rcu();
|
|
skb_queue_purge(&sdata->u.mgd.skb_queue);
|
|
/* fall through */
|
|
case NL80211_IFTYPE_ADHOC:
|
|
if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
|
|
del_timer_sync(&sdata->u.ibss.timer);
|
|
cancel_work_sync(&sdata->u.ibss.work);
|
|
synchronize_rcu();
|
|
skb_queue_purge(&sdata->u.ibss.skb_queue);
|
|
}
|
|
/* fall through */
|
|
case NL80211_IFTYPE_MESH_POINT:
|
|
if (ieee80211_vif_is_mesh(&sdata->vif)) {
|
|
/* other_bss and allmulti are always set on mesh
|
|
* ifaces */
|
|
local->fif_other_bss--;
|
|
atomic_dec(&local->iff_allmultis);
|
|
|
|
ieee80211_configure_filter(local);
|
|
|
|
ieee80211_stop_mesh(sdata);
|
|
}
|
|
/* fall through */
|
|
default:
|
|
if (local->scan_sdata == sdata)
|
|
ieee80211_scan_cancel(local);
|
|
|
|
/*
|
|
* Disable beaconing for AP and mesh, IBSS can't
|
|
* still be joined to a network at this point.
|
|
*/
|
|
if (sdata->vif.type == NL80211_IFTYPE_AP ||
|
|
sdata->vif.type == NL80211_IFTYPE_MESH_POINT) {
|
|
ieee80211_bss_info_change_notify(sdata,
|
|
BSS_CHANGED_BEACON_ENABLED);
|
|
}
|
|
|
|
conf.vif = &sdata->vif;
|
|
conf.type = sdata->vif.type;
|
|
conf.mac_addr = sdata->vif.addr;
|
|
/* disable all keys for as long as this netdev is down */
|
|
ieee80211_disable_keys(sdata);
|
|
drv_remove_interface(local, &conf);
|
|
}
|
|
|
|
sdata->bss = NULL;
|
|
|
|
hw_reconf_flags |= __ieee80211_recalc_idle(local);
|
|
|
|
ieee80211_recalc_ps(local, -1);
|
|
|
|
if (local->open_count == 0) {
|
|
ieee80211_clear_tx_pending(local);
|
|
ieee80211_stop_device(local);
|
|
|
|
/* no reconfiguring after stop! */
|
|
hw_reconf_flags = 0;
|
|
}
|
|
|
|
/* do after stop to avoid reconfiguring when we stop anyway */
|
|
if (hw_reconf_flags)
|
|
ieee80211_hw_config(local, hw_reconf_flags);
|
|
|
|
spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
|
|
for (i = 0; i < IEEE80211_MAX_QUEUES; i++) {
|
|
skb_queue_walk_safe(&local->pending[i], skb, tmp) {
|
|
struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
|
|
if (info->control.vif == &sdata->vif) {
|
|
__skb_unlink(skb, &local->pending[i]);
|
|
dev_kfree_skb_irq(skb);
|
|
}
|
|
}
|
|
}
|
|
spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void ieee80211_set_multicast_list(struct net_device *dev)
|
|
{
|
|
struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
|
|
struct ieee80211_local *local = sdata->local;
|
|
int allmulti, promisc, sdata_allmulti, sdata_promisc;
|
|
|
|
allmulti = !!(dev->flags & IFF_ALLMULTI);
|
|
promisc = !!(dev->flags & IFF_PROMISC);
|
|
sdata_allmulti = !!(sdata->flags & IEEE80211_SDATA_ALLMULTI);
|
|
sdata_promisc = !!(sdata->flags & IEEE80211_SDATA_PROMISC);
|
|
|
|
if (allmulti != sdata_allmulti) {
|
|
if (dev->flags & IFF_ALLMULTI)
|
|
atomic_inc(&local->iff_allmultis);
|
|
else
|
|
atomic_dec(&local->iff_allmultis);
|
|
sdata->flags ^= IEEE80211_SDATA_ALLMULTI;
|
|
}
|
|
|
|
if (promisc != sdata_promisc) {
|
|
if (dev->flags & IFF_PROMISC)
|
|
atomic_inc(&local->iff_promiscs);
|
|
else
|
|
atomic_dec(&local->iff_promiscs);
|
|
sdata->flags ^= IEEE80211_SDATA_PROMISC;
|
|
}
|
|
spin_lock_bh(&local->filter_lock);
|
|
__dev_addr_sync(&local->mc_list, &local->mc_count,
|
|
&dev->mc_list, &dev->mc_count);
|
|
spin_unlock_bh(&local->filter_lock);
|
|
ieee80211_queue_work(&local->hw, &local->reconfig_filter);
|
|
}
|
|
|
|
/*
|
|
* 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_ADHOC:
|
|
if (WARN_ON(sdata->u.ibss.presp))
|
|
kfree_skb(sdata->u.ibss.presp);
|
|
break;
|
|
case NL80211_IFTYPE_STATION:
|
|
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);
|
|
}
|
|
|
|
static const struct net_device_ops ieee80211_dataif_ops = {
|
|
.ndo_open = ieee80211_open,
|
|
.ndo_stop = ieee80211_stop,
|
|
.ndo_uninit = ieee80211_teardown_sdata,
|
|
.ndo_start_xmit = ieee80211_subif_start_xmit,
|
|
.ndo_set_multicast_list = ieee80211_set_multicast_list,
|
|
.ndo_change_mtu = ieee80211_change_mtu,
|
|
.ndo_set_mac_address = ieee80211_change_mac,
|
|
};
|
|
|
|
static const struct net_device_ops ieee80211_monitorif_ops = {
|
|
.ndo_open = ieee80211_open,
|
|
.ndo_stop = ieee80211_stop,
|
|
.ndo_uninit = ieee80211_teardown_sdata,
|
|
.ndo_start_xmit = ieee80211_monitor_start_xmit,
|
|
.ndo_set_multicast_list = ieee80211_set_multicast_list,
|
|
.ndo_change_mtu = ieee80211_change_mtu,
|
|
.ndo_set_mac_address = eth_mac_addr,
|
|
};
|
|
|
|
static void ieee80211_if_setup(struct net_device *dev)
|
|
{
|
|
ether_setup(dev);
|
|
dev->netdev_ops = &ieee80211_dataif_ops;
|
|
dev->destructor = free_netdev;
|
|
}
|
|
|
|
/*
|
|
* 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;
|
|
sdata->dev->netdev_ops = &ieee80211_dataif_ops;
|
|
sdata->wdev.iftype = 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:
|
|
ieee80211_sta_setup_sdata(sdata);
|
|
break;
|
|
case NL80211_IFTYPE_ADHOC:
|
|
ieee80211_ibss_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->netdev_ops = &ieee80211_monitorif_ops;
|
|
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;
|
|
|
|
/* Setting ad-hoc mode on non-IBSS channel is not supported. */
|
|
if (sdata->local->oper_channel->flags & IEEE80211_CHAN_NO_IBSS &&
|
|
type == NL80211_IFTYPE_ADHOC)
|
|
return -EOPNOTSUPP;
|
|
|
|
/*
|
|
* 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->vif.bss_conf.basic_rates =
|
|
ieee80211_mandatory_rates(sdata->local,
|
|
sdata->local->hw.conf.channel->band);
|
|
sdata->drop_unencrypted = 0;
|
|
if (type == NL80211_IFTYPE_STATION)
|
|
sdata->u.mgd.use_4addr = false;
|
|
|
|
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;
|
|
dev_net_set(ndev, wiphy_net(local->hw.wiphy));
|
|
|
|
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);
|
|
memcpy(ndev->perm_addr, ndev->dev_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;
|
|
memcpy(sdata->vif.addr, ndev->dev_addr, ETH_ALEN);
|
|
memcpy(sdata->name, ndev->name, IFNAMSIZ);
|
|
|
|
/* 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);
|
|
|
|
if (params) {
|
|
ndev->ieee80211_ptr->use_4addr = params->use_4addr;
|
|
if (type == NL80211_IFTYPE_STATION)
|
|
sdata->u.mgd.use_4addr = params->use_4addr;
|
|
}
|
|
|
|
ret = register_netdevice(ndev);
|
|
if (ret)
|
|
goto fail;
|
|
|
|
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);
|
|
|
|
mutex_lock(&local->iflist_mtx);
|
|
list_add_tail_rcu(&sdata->list, &local->interfaces);
|
|
mutex_unlock(&local->iflist_mtx);
|
|
|
|
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();
|
|
|
|
mutex_lock(&sdata->local->iflist_mtx);
|
|
list_del_rcu(&sdata->list);
|
|
mutex_unlock(&sdata->local->iflist_mtx);
|
|
|
|
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;
|
|
LIST_HEAD(unreg_list);
|
|
|
|
ASSERT_RTNL();
|
|
|
|
mutex_lock(&local->iflist_mtx);
|
|
list_for_each_entry_safe(sdata, tmp, &local->interfaces, list) {
|
|
list_del(&sdata->list);
|
|
|
|
unregister_netdevice_queue(sdata->dev, &unreg_list);
|
|
}
|
|
mutex_unlock(&local->iflist_mtx);
|
|
unregister_netdevice_many(&unreg_list);
|
|
}
|
|
|
|
static u32 ieee80211_idle_off(struct ieee80211_local *local,
|
|
const char *reason)
|
|
{
|
|
if (!(local->hw.conf.flags & IEEE80211_CONF_IDLE))
|
|
return 0;
|
|
|
|
#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
|
|
printk(KERN_DEBUG "%s: device no longer idle - %s\n",
|
|
wiphy_name(local->hw.wiphy), reason);
|
|
#endif
|
|
|
|
local->hw.conf.flags &= ~IEEE80211_CONF_IDLE;
|
|
return IEEE80211_CONF_CHANGE_IDLE;
|
|
}
|
|
|
|
static u32 ieee80211_idle_on(struct ieee80211_local *local)
|
|
{
|
|
if (local->hw.conf.flags & IEEE80211_CONF_IDLE)
|
|
return 0;
|
|
|
|
#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
|
|
printk(KERN_DEBUG "%s: device now idle\n",
|
|
wiphy_name(local->hw.wiphy));
|
|
#endif
|
|
|
|
local->hw.conf.flags |= IEEE80211_CONF_IDLE;
|
|
return IEEE80211_CONF_CHANGE_IDLE;
|
|
}
|
|
|
|
u32 __ieee80211_recalc_idle(struct ieee80211_local *local)
|
|
{
|
|
struct ieee80211_sub_if_data *sdata;
|
|
int count = 0;
|
|
|
|
if (local->scanning)
|
|
return ieee80211_idle_off(local, "scanning");
|
|
|
|
list_for_each_entry(sdata, &local->interfaces, list) {
|
|
if (!netif_running(sdata->dev))
|
|
continue;
|
|
/* do not count disabled managed interfaces */
|
|
if (sdata->vif.type == NL80211_IFTYPE_STATION &&
|
|
!sdata->u.mgd.associated &&
|
|
list_empty(&sdata->u.mgd.work_list))
|
|
continue;
|
|
/* do not count unused IBSS interfaces */
|
|
if (sdata->vif.type == NL80211_IFTYPE_ADHOC &&
|
|
!sdata->u.ibss.ssid_len)
|
|
continue;
|
|
/* count everything else */
|
|
count++;
|
|
}
|
|
|
|
if (!count)
|
|
return ieee80211_idle_on(local);
|
|
else
|
|
return ieee80211_idle_off(local, "in use");
|
|
|
|
return 0;
|
|
}
|
|
|
|
void ieee80211_recalc_idle(struct ieee80211_local *local)
|
|
{
|
|
u32 chg;
|
|
|
|
mutex_lock(&local->iflist_mtx);
|
|
chg = __ieee80211_recalc_idle(local);
|
|
mutex_unlock(&local->iflist_mtx);
|
|
if (chg)
|
|
ieee80211_hw_config(local, chg);
|
|
}
|
|
|
|
static int netdev_notify(struct notifier_block *nb,
|
|
unsigned long state,
|
|
void *ndev)
|
|
{
|
|
struct net_device *dev = ndev;
|
|
struct ieee80211_sub_if_data *sdata;
|
|
|
|
if (state != NETDEV_CHANGENAME)
|
|
return 0;
|
|
|
|
if (!dev->ieee80211_ptr || !dev->ieee80211_ptr->wiphy)
|
|
return 0;
|
|
|
|
if (dev->ieee80211_ptr->wiphy->privid != mac80211_wiphy_privid)
|
|
return 0;
|
|
|
|
sdata = IEEE80211_DEV_TO_SUB_IF(dev);
|
|
|
|
memcpy(sdata->name, sdata->name, IFNAMSIZ);
|
|
|
|
ieee80211_debugfs_rename_netdev(sdata);
|
|
return 0;
|
|
}
|
|
|
|
static struct notifier_block mac80211_netdev_notifier = {
|
|
.notifier_call = netdev_notify,
|
|
};
|
|
|
|
int ieee80211_iface_init(void)
|
|
{
|
|
return register_netdevice_notifier(&mac80211_netdev_notifier);
|
|
}
|
|
|
|
void ieee80211_iface_exit(void)
|
|
{
|
|
unregister_netdevice_notifier(&mac80211_netdev_notifier);
|
|
}
|