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-rw-r--r--net/mac80211/ieee80211.c140
-rw-r--r--net/mac80211/ieee80211_i.h1
2 files changed, 118 insertions, 23 deletions
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 @@ static const unsigned char eapol_header[] =
{ 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 @@ ieee80211_tx_h_fragment(struct ieee80211_txrx_data *tx)
/* 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 @@ ieee80211_tx_h_fragment(struct ieee80211_txrx_data *tx)
/* 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 @@ static int ieee80211_master_start_xmit(struct sk_buff *skb,
}
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 @@ static int ieee80211_subif_start_xmit(struct sk_buff *skb,
* 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 @@ ieee80211_mgmt_start_xmit(struct sk_buff *skb, struct net_device *dev)
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 @@ struct sk_buff * ieee80211_beacon_get(struct ieee80211_hw *hw, int if_id,
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 @@ void ieee80211_tx_status(struct ieee80211_hw *hw, struct sk_buff *skb,
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 @@ void ieee80211_tx_status(struct ieee80211_hw *hw, struct sk_buff *skb,
local->dot11FailedCount++;
}
- if (!(status->control.flags & IEEE80211_TXCTL_REQ_TX_STATUS)
- || unlikely(!local->apdev)) {
+ msg_type = (status->flags & IEEE80211_TX_STATUS_ACK) ?
+ ieee80211_msg_tx_callback_ack : ieee80211_msg_tx_callback_fail;
+
+ /* 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;
}
- msg_type = (status->flags & IEEE80211_TX_STATUS_ACK) ?
- ieee80211_msg_tx_callback_ack : ieee80211_msg_tx_callback_fail;
+ /* send frame to monitor interfaces now */
- /* 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) {
+ if (skb_headroom(skb) < sizeof(*rthdr)) {
+ printk(KERN_ERR "ieee80211_tx_status: headroom too small\n");
dev_kfree_skb(skb);
return;
}
- dev_kfree_skb(skb);
- skb = skb2;
- /* Send frame to hostapd */
- ieee80211_rx_mgmt(local, skb, NULL, msg_type);
+ 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 @@ int ieee80211_register_hw(struct ieee80211_hw *hw)
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;
diff --git a/net/mac80211/ieee80211_i.h b/net/mac80211/ieee80211_i.h
index af4d14d..5a91e17 100644
--- a/net/mac80211/ieee80211_i.h
+++ b/net/mac80211/ieee80211_i.h
@@ -392,6 +392,7 @@ struct ieee80211_local {
int monitors;
struct iw_statistics wstats;
u8 wstats_flags;
+ int tx_headroom; /* required headroom for hardware/radiotap */
enum {
IEEE80211_DEV_UNINITIALIZED = 0,
generated by cgit v1.1 at 2024-12-25 09:13:56 +0000