[PATCH] mac80211: show transmitted frames on monitor interfaces
This patch makes mac80211 show transmitted frames on monitor interfaces,
including radiotap headers that indicate some transmission parameters.
The shown parameters will need to be expanded, but this should work as
a basis to work from.
Signed-off-by: Johannes Berg <johannes@sipsolutions.net>
Signed-off-by: Jiri Benc <jbenc@suse.cz>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
diff --git a/net/mac80211/ieee80211.c b/net/mac80211/ieee80211.c
index 8b57eaa..85f23fd 100644
--- a/net/mac80211/ieee80211.c
+++ b/net/mac80211/ieee80211.c
@@ -57,6 +57,17 @@
{ 0xaa, 0xaa, 0x03, 0x00, 0x00, 0x00, 0x88, 0x8e };
+/*
+ * For seeing transmitted packets on monitor interfaces
+ * we have a radiotap header too.
+ */
+struct ieee80211_tx_status_rtap_hdr {
+ struct ieee80211_radiotap_header hdr;
+ __le16 tx_flags;
+ u8 data_retries;
+} __attribute__ ((packed));
+
+
static inline void ieee80211_include_sequence(struct ieee80211_sub_if_data *sdata,
struct ieee80211_hdr *hdr)
{
@@ -529,7 +540,7 @@
/* reserve enough extra head and tail room for possible
* encryption */
frag = frags[i] =
- dev_alloc_skb(tx->local->hw.extra_tx_headroom +
+ dev_alloc_skb(tx->local->tx_headroom +
frag_threshold +
IEEE80211_ENCRYPT_HEADROOM +
IEEE80211_ENCRYPT_TAILROOM);
@@ -538,8 +549,8 @@
/* Make sure that all fragments use the same priority so
* that they end up using the same TX queue */
frag->priority = first->priority;
- skb_reserve(frag, tx->local->hw.extra_tx_headroom +
- IEEE80211_ENCRYPT_HEADROOM);
+ skb_reserve(frag, tx->local->tx_headroom +
+ IEEE80211_ENCRYPT_HEADROOM);
fhdr = (struct ieee80211_hdr *) skb_put(frag, hdrlen);
memcpy(fhdr, first->data, hdrlen);
if (i == num_fragm - 2)
@@ -1636,8 +1647,7 @@
}
osdata = IEEE80211_DEV_TO_SUB_IF(odev);
- headroom = osdata->local->hw.extra_tx_headroom +
- IEEE80211_ENCRYPT_HEADROOM;
+ headroom = osdata->local->tx_headroom + IEEE80211_ENCRYPT_HEADROOM;
if (skb_headroom(skb) < headroom) {
if (pskb_expand_head(skb, headroom, 0, GFP_ATOMIC)) {
dev_kfree_skb(skb);
@@ -1833,7 +1843,7 @@
* build in headroom in __dev_alloc_skb() (linux/skbuff.h) and
* alloc_skb() (net/core/skbuff.c)
*/
- head_need = hdrlen + encaps_len + local->hw.extra_tx_headroom;
+ head_need = hdrlen + encaps_len + local->tx_headroom;
head_need -= skb_headroom(skb);
/* We are going to modify skb data, so make a copy of it if happens to
@@ -1920,9 +1930,9 @@
return 0;
}
- if (skb_headroom(skb) < sdata->local->hw.extra_tx_headroom) {
- if (pskb_expand_head(skb,
- sdata->local->hw.extra_tx_headroom, 0, GFP_ATOMIC)) {
+ if (skb_headroom(skb) < sdata->local->tx_headroom) {
+ if (pskb_expand_head(skb, sdata->local->tx_headroom,
+ 0, GFP_ATOMIC)) {
dev_kfree_skb(skb);
return 0;
}
@@ -2061,12 +2071,12 @@
bh_len = ap->beacon_head_len;
bt_len = ap->beacon_tail_len;
- skb = dev_alloc_skb(local->hw.extra_tx_headroom +
+ skb = dev_alloc_skb(local->tx_headroom +
bh_len + bt_len + 256 /* maximum TIM len */);
if (!skb)
return NULL;
- skb_reserve(skb, local->hw.extra_tx_headroom);
+ skb_reserve(skb, local->tx_headroom);
memcpy(skb_put(skb, bh_len), b_head, bh_len);
ieee80211_include_sequence(sdata, (struct ieee80211_hdr *)skb->data);
@@ -4498,6 +4508,9 @@
struct ieee80211_local *local = hw_to_local(hw);
u16 frag, type;
u32 msg_type;
+ struct ieee80211_tx_status_rtap_hdr *rthdr;
+ struct ieee80211_sub_if_data *sdata;
+ int monitors;
if (!status) {
printk(KERN_ERR
@@ -4609,27 +4622,100 @@
local->dot11FailedCount++;
}
- if (!(status->control.flags & IEEE80211_TXCTL_REQ_TX_STATUS)
- || unlikely(!local->apdev)) {
- dev_kfree_skb(skb);
- return;
- }
-
msg_type = (status->flags & IEEE80211_TX_STATUS_ACK) ?
ieee80211_msg_tx_callback_ack : ieee80211_msg_tx_callback_fail;
- /* skb was the original skb used for TX. Clone it and give the clone
- * to netif_rx(). Free original skb. */
- skb2 = skb_copy(skb, GFP_ATOMIC);
- if (!skb2) {
+ /* this was a transmitted frame, but now we want to reuse it */
+ skb_orphan(skb);
+
+ if ((status->control.flags & IEEE80211_TXCTL_REQ_TX_STATUS) &&
+ local->apdev) {
+ if (local->monitors) {
+ skb2 = skb_clone(skb, GFP_ATOMIC);
+ } else {
+ skb2 = skb;
+ skb = NULL;
+ }
+
+ if (skb2)
+ /* Send frame to hostapd */
+ ieee80211_rx_mgmt(local, skb2, NULL, msg_type);
+
+ if (!skb)
+ return;
+ }
+
+ if (!local->monitors) {
dev_kfree_skb(skb);
return;
}
- dev_kfree_skb(skb);
- skb = skb2;
- /* Send frame to hostapd */
- ieee80211_rx_mgmt(local, skb, NULL, msg_type);
+ /* send frame to monitor interfaces now */
+
+ if (skb_headroom(skb) < sizeof(*rthdr)) {
+ printk(KERN_ERR "ieee80211_tx_status: headroom too small\n");
+ dev_kfree_skb(skb);
+ return;
+ }
+
+ rthdr = (struct ieee80211_tx_status_rtap_hdr*)
+ 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_TX_FLAGS) |
+ (1 << IEEE80211_RADIOTAP_DATA_RETRIES));
+
+ if (!(status->flags & IEEE80211_TX_STATUS_ACK) &&
+ !is_multicast_ether_addr(hdr->addr1))
+ rthdr->tx_flags |= cpu_to_le16(IEEE80211_RADIOTAP_F_TX_FAIL);
+
+ if ((status->control.flags & IEEE80211_TXCTL_USE_RTS_CTS) &&
+ (status->control.flags & IEEE80211_TXCTL_USE_CTS_PROTECT))
+ rthdr->tx_flags |= cpu_to_le16(IEEE80211_RADIOTAP_F_TX_CTS);
+ else if (status->control.flags & IEEE80211_TXCTL_USE_RTS_CTS)
+ rthdr->tx_flags |= cpu_to_le16(IEEE80211_RADIOTAP_F_TX_RTS);
+
+ rthdr->data_retries = status->retry_count;
+
+ read_lock(&local->sub_if_lock);
+ monitors = local->monitors;
+ list_for_each_entry(sdata, &local->sub_if_list, 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;
+
+ if (sdata->type == IEEE80211_IF_TYPE_MNTR) {
+ if (!netif_running(sdata->dev))
+ continue;
+ monitors--;
+ if (monitors)
+ skb2 = skb_clone(skb, GFP_KERNEL);
+ 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;
+ break;
+ }
+ }
+ out:
+ read_unlock(&local->sub_if_lock);
+ if (skb)
+ dev_kfree_skb(skb);
}
EXPORT_SYMBOL(ieee80211_tx_status);
@@ -4926,6 +5012,14 @@
goto fail_workqueue;
}
+ /*
+ * The hardware needs headroom for sending the frame,
+ * and we need some headroom for passing the frame to monitor
+ * interfaces, but never both at the same time.
+ */
+ local->tx_headroom = max(local->hw.extra_tx_headroom,
+ sizeof(struct ieee80211_tx_status_rtap_hdr));
+
debugfs_hw_add(local);
local->hw.conf.beacon_int = 1000;