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mac80211_hwsim: Add support for client PS mode

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This introduces a debugfs file (ieee80211/phy#/hwsim/ps) that can be
used to force a simulated radio into power save mode. Following values
can be written into this file to change PS mode:
0 = power save disabled (constantly awake)
1 = power save enabled (drop all frames; do not send PS-Poll)
2 = power save enabled (send PS-Poll frames automatically to receive
    buffered unicast frames); not yet fully implemented
3 = manual PS-Poll trigger (send a single PS-Poll frame)

Two different behavior for power save mode processing can be tested:
- move between modes 1 and 0 (i.e., receive all buffered frames at a
  time)
- move to mode 1 and use manual PS-Poll frames (write 3 to the 'ps'
  debugfs file) to fetch power save buffered frames one at a time

Mode 2 (automatic PS-Poll) does not yet parse Beacon frames, but
eventually, it should take a look at TIM IE and send PS-Poll if a
traffic bit is set for our AID.

Signed-off-by: Jouni Malinen <jouni.malinen@atheros.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
This commit is contained in:
Jouni Malinen 2008-10-30 19:59:05 +02:00 committed by John W. Linville
parent fbf1892739
commit fc6971d491
2 changed files with 191 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

184
drivers/net/wireless/mac80211_hwsim.c
View File

@ -21,6 +21,7 @@
#include <linux/if_arp.h>
#include <linux/rtnetlink.h>
#include <linux/etherdevice.h>
#include <linux/debugfs.h>
MODULE_AUTHOR("Jouni Malinen");
MODULE_DESCRIPTION("Software simulator of 802.11 radio(s) for mac80211");
@ -32,6 +33,9 @@ MODULE_PARM_DESC(radios, "Number of simulated radios");
struct hwsim_vif_priv {
u32 magic;
u8 bssid[ETH_ALEN];
bool assoc;
u16 aid;
};
#define HWSIM_VIF_MAGIC 0x69537748
@ -132,6 +136,12 @@ struct mac80211_hwsim_data {
unsigned int rx_filter;
int started;
struct timer_list beacon_timer;
enum ps_mode {
PS_DISABLED, PS_ENABLED, PS_AUTO_POLL, PS_MANUAL_POLL
} ps;
bool ps_poll_pending;
struct dentry *debugfs;
struct dentry *debugfs_ps;
};
@ -196,6 +206,34 @@ static void mac80211_hwsim_monitor_rx(struct ieee80211_hw *hw,
}
static bool hwsim_ps_rx_ok(struct mac80211_hwsim_data *data,
struct sk_buff *skb)
{
switch (data->ps) {
case PS_DISABLED:
return true;
case PS_ENABLED:
return false;
case PS_AUTO_POLL:
/* TODO: accept (some) Beacons by default and other frames only
* if pending PS-Poll has been sent */
return true;
case PS_MANUAL_POLL:
/* Allow unicast frames to own address if there is a pending
* PS-Poll */
if (data->ps_poll_pending &&
memcmp(data->hw->wiphy->perm_addr, skb->data + 4,
ETH_ALEN) == 0) {
data->ps_poll_pending = false;
return true;
}
return false;
}
return true;
}
static bool mac80211_hwsim_tx_frame(struct ieee80211_hw *hw,
struct sk_buff *skb)
{
@ -212,6 +250,9 @@ static bool mac80211_hwsim_tx_frame(struct ieee80211_hw *hw,
rx_status.rate_idx = info->control.rates[0].idx;
/* TODO: simulate signal strength (and optional packet drop) */
if (data->ps != PS_DISABLED)
hdr->frame_control |= cpu_to_le16(IEEE80211_FCTL_PM);
/* Copy skb to all enabled radios that are on the current frequency */
spin_lock(&hwsim_radio_lock);
list_for_each_entry(data2, &hwsim_radios, list) {
@ -221,6 +262,7 @@ static bool mac80211_hwsim_tx_frame(struct ieee80211_hw *hw,
continue;
if (!data2->started || !data2->radio_enabled ||
!hwsim_ps_rx_ok(data2, skb) ||
data->channel->center_freq != data2->channel->center_freq)
continue;
@ -404,7 +446,16 @@ static int mac80211_hwsim_config_interface(struct ieee80211_hw *hw,
struct ieee80211_vif *vif,
struct ieee80211_if_conf *conf)
{
struct hwsim_vif_priv *vp = (void *)vif->drv_priv;
hwsim_check_magic(vif);
if (conf->changed & IEEE80211_IFCC_BSSID) {
DECLARE_MAC_BUF(mac);
printk(KERN_DEBUG "%s:%s: BSSID changed: %s\n",
wiphy_name(hw->wiphy), __func__,
print_mac(mac, conf->bssid));
memcpy(vp->bssid, conf->bssid, ETH_ALEN);
}
return 0;
}
@ -413,6 +464,8 @@ static void mac80211_hwsim_bss_info_changed(struct ieee80211_hw *hw,
struct ieee80211_bss_conf *info,
u32 changed)
{
struct hwsim_vif_priv *vp = (void *)vif->drv_priv;
hwsim_check_magic(vif);
printk(KERN_DEBUG "%s:%s(changed=0x%x)\n",
@ -421,6 +474,8 @@ static void mac80211_hwsim_bss_info_changed(struct ieee80211_hw *hw,
if (changed & BSS_CHANGED_ASSOC) {
printk(KERN_DEBUG " %s: ASSOC: assoc=%d aid=%d\n",
wiphy_name(hw->wiphy), info->assoc, info->aid);
vp->assoc = info->assoc;
vp->aid = info->aid;
}
if (changed & BSS_CHANGED_ERP_CTS_PROT) {
@ -518,6 +573,8 @@ static void mac80211_hwsim_free(void)
spin_unlock_bh(&hwsim_radio_lock);
list_for_each_entry(data, &tmplist, list) {
debugfs_remove(data->debugfs_ps);
debugfs_remove(data->debugfs);
ieee80211_unregister_hw(data->hw);
device_unregister(data->dev);
ieee80211_free_hw(data->hw);
@ -543,6 +600,127 @@ static void hwsim_mon_setup(struct net_device *dev)
}
static void hwsim_send_ps_poll(void *dat, u8 *mac, struct ieee80211_vif *vif)
{
struct mac80211_hwsim_data *data = dat;
struct hwsim_vif_priv *vp = (void *)vif->drv_priv;
DECLARE_MAC_BUF(buf);
struct sk_buff *skb;
struct ieee80211_pspoll *pspoll;
if (!vp->assoc)
return;
printk(KERN_DEBUG "%s:%s: send PS-Poll to %s for aid %d\n",
wiphy_name(data->hw->wiphy), __func__,
print_mac(buf, vp->bssid), vp->aid);
skb = dev_alloc_skb(sizeof(*pspoll));
if (!skb)
return;
pspoll = (void *) skb_put(skb, sizeof(*pspoll));
pspoll->frame_control = cpu_to_le16(IEEE80211_FTYPE_CTL |
IEEE80211_STYPE_PSPOLL |
IEEE80211_FCTL_PM);
pspoll->aid = cpu_to_le16(0xc000 | vp->aid);
memcpy(pspoll->bssid, vp->bssid, ETH_ALEN);
memcpy(pspoll->ta, mac, ETH_ALEN);
if (data->radio_enabled &&
!mac80211_hwsim_tx_frame(data->hw, skb))
printk(KERN_DEBUG "%s: PS-Poll frame not ack'ed\n", __func__);
dev_kfree_skb(skb);
}
static void hwsim_send_nullfunc(struct mac80211_hwsim_data *data, u8 *mac,
struct ieee80211_vif *vif, int ps)
{
struct hwsim_vif_priv *vp = (void *)vif->drv_priv;
DECLARE_MAC_BUF(buf);
struct sk_buff *skb;
struct ieee80211_hdr *hdr;
if (!vp->assoc)
return;
printk(KERN_DEBUG "%s:%s: send data::nullfunc to %s ps=%d\n",
wiphy_name(data->hw->wiphy), __func__,
print_mac(buf, vp->bssid), ps);
skb = dev_alloc_skb(sizeof(*hdr));
if (!skb)
return;
hdr = (void *) skb_put(skb, sizeof(*hdr) - ETH_ALEN);
hdr->frame_control = cpu_to_le16(IEEE80211_FTYPE_DATA |
IEEE80211_STYPE_NULLFUNC |
(ps ? IEEE80211_FCTL_PM : 0));
hdr->duration_id = cpu_to_le16(0);
memcpy(hdr->addr1, vp->bssid, ETH_ALEN);
memcpy(hdr->addr2, mac, ETH_ALEN);
memcpy(hdr->addr3, vp->bssid, ETH_ALEN);
if (data->radio_enabled &&
!mac80211_hwsim_tx_frame(data->hw, skb))
printk(KERN_DEBUG "%s: nullfunc frame not ack'ed\n", __func__);
dev_kfree_skb(skb);
}
static void hwsim_send_nullfunc_ps(void *dat, u8 *mac,
struct ieee80211_vif *vif)
{
struct mac80211_hwsim_data *data = dat;
hwsim_send_nullfunc(data, mac, vif, 1);
}
static void hwsim_send_nullfunc_no_ps(void *dat, u8 *mac,
struct ieee80211_vif *vif)
{
struct mac80211_hwsim_data *data = dat;
hwsim_send_nullfunc(data, mac, vif, 0);
}
static int hwsim_fops_ps_read(void *dat, u64 *val)
{
struct mac80211_hwsim_data *data = dat;
*val = data->ps;
return 0;
}
static int hwsim_fops_ps_write(void *dat, u64 val)
{
struct mac80211_hwsim_data *data = dat;
enum ps_mode old_ps;
if (val != PS_DISABLED && val != PS_ENABLED && val != PS_AUTO_POLL &&
val != PS_MANUAL_POLL)
return -EINVAL;
old_ps = data->ps;
data->ps = val;
if (val == PS_MANUAL_POLL) {
ieee80211_iterate_active_interfaces(data->hw,
hwsim_send_ps_poll, data);
data->ps_poll_pending = true;
} else if (old_ps == PS_DISABLED && val != PS_DISABLED) {
ieee80211_iterate_active_interfaces(data->hw,
hwsim_send_nullfunc_ps,
data);
} else if (old_ps != PS_DISABLED && val == PS_DISABLED) {
ieee80211_iterate_active_interfaces(data->hw,
hwsim_send_nullfunc_no_ps,
data);
}
return 0;
}
DEFINE_SIMPLE_ATTRIBUTE(hwsim_fops_ps, hwsim_fops_ps_read, hwsim_fops_ps_write,
"%llu\n");
static int __init init_mac80211_hwsim(void)
{
int i, err = 0;
@ -634,6 +812,12 @@ static int __init init_mac80211_hwsim(void)
wiphy_name(hw->wiphy),
hw->wiphy->perm_addr);
data->debugfs = debugfs_create_dir("hwsim",
hw->wiphy->debugfsdir);
data->debugfs_ps = debugfs_create_file("ps", 0666,
data->debugfs, data,
&hwsim_fops_ps);
setup_timer(&data->beacon_timer, mac80211_hwsim_beacon,
(unsigned long) hw);

7
include/linux/ieee80211.h
View File

@ -669,6 +669,13 @@ struct ieee80211_cts {
u8 ra[6];
} __attribute__ ((packed));
struct ieee80211_pspoll {
__le16 frame_control;
__le16 aid;
u8 bssid[6];
u8 ta[6];
} __attribute__ ((packed));
/**
* struct ieee80211_bar - HT Block Ack Request
*