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mac80211: Add cooked monitor mode support 

This adds "cooked" monitor mode to mac80211. A monitor interface
in "cooked" mode will see all frames that mac80211 has not used
internally.

Signed-off-by: Michael Wu <flamingice@sourmilk.net>
Signed-off-by: Johannes Berg <johannes@sipsolutions.net>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
This commit is contained in:
Michael Wu 2008-01-31 19:48:27 +01:00 committed by John W. Linville
parent 8944b79fe9
commit 3d30d949cf
3 changed files with 128 additions and 33 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

69
net/mac80211/ieee80211.c
View File

@ -239,6 +239,11 @@ static int ieee80211_open(struct net_device *dev)
/* no need to tell driver */
break;
case IEEE80211_IF_TYPE_MNTR:
if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) {
local->cooked_mntrs++;
break;
}
/* must be before the call to ieee80211_configure_filter */
local->monitors++;
if (local->monitors == 1)
@ -370,6 +375,11 @@ static int ieee80211_stop(struct net_device *dev)
/* no need to tell driver */
break;
case IEEE80211_IF_TYPE_MNTR:
if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) {
local->cooked_mntrs--;
break;
}
local->monitors--;
if (local->monitors == 0)
local->hw.conf.flags &= ~IEEE80211_CONF_RADIOTAP;
@ -1177,7 +1187,7 @@ void ieee80211_tx_status(struct ieee80211_hw *hw, struct sk_buff *skb,
u16 frag, type;
struct ieee80211_tx_status_rtap_hdr *rthdr;
struct ieee80211_sub_if_data *sdata;
int monitors;
struct net_device *prev_dev = NULL;
if (!status) {
printk(KERN_ERR
@ -1290,7 +1300,11 @@ void ieee80211_tx_status(struct ieee80211_hw *hw, struct sk_buff *skb,
/* this was a transmitted frame, but now we want to reuse it */
skb_orphan(skb);
if (!local->monitors) {
/*
* This is a bit racy but we can avoid a lot of work
* with this test...
*/
if (!local->monitors && !local->cooked_mntrs) {
dev_kfree_skb(skb);
return;
}
@ -1324,42 +1338,37 @@ void ieee80211_tx_status(struct ieee80211_hw *hw, struct sk_buff *skb,
rthdr->data_retries = status->retry_count;
rcu_read_lock();
monitors = local->monitors;
list_for_each_entry_rcu(sdata, &local->interfaces, list) {
/*
* Using the monitors counter is possibly racy, but
* if the value is wrong we simply either clone the skb
* once too much or forget sending it to one monitor iface
* The latter case isn't nice but fixing the race is much
* more complicated.
*/
if (!monitors || !skb)
goto out;
/* XXX: is this sufficient for BPF? */
skb_set_mac_header(skb, 0);
skb->ip_summed = CHECKSUM_UNNECESSARY;
skb->pkt_type = PACKET_OTHERHOST;
skb->protocol = htons(ETH_P_802_2);
memset(skb->cb, 0, sizeof(skb->cb));
rcu_read_lock();
list_for_each_entry_rcu(sdata, &local->interfaces, list) {
if (sdata->vif.type == IEEE80211_IF_TYPE_MNTR) {
if (!netif_running(sdata->dev))
continue;
monitors--;
if (monitors)
if (prev_dev) {
skb2 = skb_clone(skb, GFP_ATOMIC);
else
skb2 = NULL;
skb->dev = sdata->dev;
/* XXX: is this sufficient for BPF? */
skb_set_mac_header(skb, 0);
skb->ip_summed = CHECKSUM_UNNECESSARY;
skb->pkt_type = PACKET_OTHERHOST;
skb->protocol = htons(ETH_P_802_2);
memset(skb->cb, 0, sizeof(skb->cb));
netif_rx(skb);
skb = skb2;
if (skb2) {
skb2->dev = prev_dev;
netif_rx(skb2);
}
}
prev_dev = sdata->dev;
}
}
out:
if (prev_dev) {
skb->dev = prev_dev;
netif_rx(skb);
skb = NULL;
}
rcu_read_unlock();
if (skb)
dev_kfree_skb(skb);
dev_kfree_skb(skb);
}
EXPORT_SYMBOL(ieee80211_tx_status);

3
net/mac80211/ieee80211_i.h
View File

@ -131,6 +131,7 @@ typedef unsigned __bitwise__ ieee80211_rx_result;
#define IEEE80211_TXRXD_RXRA_MATCH BIT(5)
#define IEEE80211_TXRXD_TX_INJECTED BIT(6)
#define IEEE80211_TXRXD_RX_AMSDU BIT(7)
#define IEEE80211_TXRXD_RX_CMNTR_REPORTED BIT(8)
struct ieee80211_txrx_data {
struct sk_buff *skb;
struct net_device *dev;
@ -419,7 +420,7 @@ struct ieee80211_local {
struct net_device *mdev; /* wmaster# - "master" 802.11 device */
int open_count;
int monitors;
int monitors, cooked_mntrs;
/* number of interfaces with corresponding FIF_ flags */
int fif_fcsfail, fif_plcpfail, fif_control, fif_other_bss;
unsigned int filter_flags; /* FIF_* */

89
net/mac80211/rx.c
View File

@ -223,6 +223,9 @@ ieee80211_rx_monitor(struct ieee80211_local *local, struct sk_buff *origskb,
if (sdata->vif.type != IEEE80211_IF_TYPE_MNTR)
continue;
if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES)
continue;
if (prev_dev) {
skb2 = skb_clone(skb, GFP_ATOMIC);
if (skb2) {
@ -1520,6 +1523,86 @@ static void ieee80211_rx_michael_mic_report(struct net_device *dev,
rx->skb = NULL;
}
static void ieee80211_rx_cooked_monitor(struct ieee80211_txrx_data *rx)
{
struct ieee80211_sub_if_data *sdata;
struct ieee80211_local *local = rx->local;
struct ieee80211_rtap_hdr {
struct ieee80211_radiotap_header hdr;
u8 flags;
u8 rate;
__le16 chan_freq;
__le16 chan_flags;
} __attribute__ ((packed)) *rthdr;
struct sk_buff *skb = rx->skb, *skb2;
struct net_device *prev_dev = NULL;
struct ieee80211_rx_status *status = rx->u.rx.status;
if (rx->flags & IEEE80211_TXRXD_RX_CMNTR_REPORTED)
goto out_free_skb;
if (skb_headroom(skb) < sizeof(*rthdr) &&
pskb_expand_head(skb, sizeof(*rthdr), 0, GFP_ATOMIC))
goto out_free_skb;
rthdr = (void *)skb_push(skb, sizeof(*rthdr));
memset(rthdr, 0, sizeof(*rthdr));
rthdr->hdr.it_len = cpu_to_le16(sizeof(*rthdr));
rthdr->hdr.it_present =
cpu_to_le32((1 << IEEE80211_RADIOTAP_FLAGS) |
(1 << IEEE80211_RADIOTAP_RATE) |
(1 << IEEE80211_RADIOTAP_CHANNEL));
rthdr->rate = rx->u.rx.rate->bitrate / 5;
rthdr->chan_freq = cpu_to_le16(status->freq);
if (status->band == IEEE80211_BAND_5GHZ)
rthdr->chan_flags = cpu_to_le16(IEEE80211_CHAN_OFDM |
IEEE80211_CHAN_5GHZ);
else
rthdr->chan_flags = cpu_to_le16(IEEE80211_CHAN_DYN |
IEEE80211_CHAN_2GHZ);
skb_set_mac_header(skb, 0);
skb->ip_summed = CHECKSUM_UNNECESSARY;
skb->pkt_type = PACKET_OTHERHOST;
skb->protocol = htons(ETH_P_802_2);
list_for_each_entry_rcu(sdata, &local->interfaces, list) {
if (!netif_running(sdata->dev))
continue;
if (sdata->vif.type != IEEE80211_IF_TYPE_MNTR ||
!(sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES))
continue;
if (prev_dev) {
skb2 = skb_clone(skb, GFP_ATOMIC);
if (skb2) {
skb2->dev = prev_dev;
netif_rx(skb2);
}
}
prev_dev = sdata->dev;
sdata->dev->stats.rx_packets++;
sdata->dev->stats.rx_bytes += skb->len;
}
if (prev_dev) {
skb->dev = prev_dev;
netif_rx(skb);
skb = NULL;
} else
goto out_free_skb;
rx->flags |= IEEE80211_TXRXD_RX_CMNTR_REPORTED;
return;
out_free_skb:
dev_kfree_skb(skb);
}
typedef ieee80211_rx_result (*ieee80211_rx_handler)(struct ieee80211_txrx_data *);
static ieee80211_rx_handler ieee80211_rx_handlers[] =
{
@ -1574,9 +1657,11 @@ static void ieee80211_invoke_rx_handlers(struct ieee80211_sub_if_data *sdata,
}
switch (res) {
case RX_DROP_MONITOR:
case RX_DROP_UNUSABLE:
case RX_CONTINUE:
case RX_DROP_MONITOR:
ieee80211_rx_cooked_monitor(rx);
break;
case RX_DROP_UNUSABLE:
dev_kfree_skb(rx->skb);
break;
}