freewtp/openwrt/mac80211_patchs/922-mac80211_packet_tunnel.patch
Andreas Schultz 58741d302f update CAPWAP support kernel patch
reduce debug output, only report ono-IPv4 packets.
2016-03-04 17:08:37 +01:00

660 lines
20 KiB
Diff

From 03b6aa026d60cd49931934338d8ca82d05acc818 Mon Sep 17 00:00:00 2001
From: Andreas Schultz <aschultz@tpip.net>
Date: Thu, 4 Feb 2016 15:57:11 +0100
Subject: [PATCH] support patch for smartcapwap
Allows for kernel side interception and injection of IEEE 802.11 frames.
---
include/net/mac80211.h | 25 ++++
net/mac80211/ieee80211_i.h | 6 +
net/mac80211/iface.c | 56 +++++++++
net/mac80211/rx.c | 81 ++++++++++--
net/mac80211/tx.c | 306 +++++++++++++++++++++++++++++++++++++++++++++
5 files changed, 462 insertions(+), 12 deletions(-)
diff --git a/include/net/mac80211.h b/include/net/mac80211.h
index 760bc4d..6722da6 100644
--- a/include/net/mac80211.h
+++ b/include/net/mac80211.h
@@ -2200,6 +2200,31 @@ ieee80211_get_alt_retry_rate(const struct ieee80211_hw *hw,
void ieee80211_free_txskb(struct ieee80211_hw *hw, struct sk_buff *skb);
/**
+ *
+ */
+struct ieee80211_pcktunnel {
+ u16 subtype_mask[3]; /* 0: MGMT, 1: CTLR, 2: DATA */
+
+ int (*handler)(u32 ifindex, struct sk_buff *skb, int sig_dbm, unsigned char rate, void *data);
+ void *data;
+};
+
+/**
+ *
+ */
+int ieee80211_pcktunnel_register(struct net_device *dev, struct ieee80211_pcktunnel *handler);
+
+/**
+ *
+ */
+int ieee80211_pcktunnel_deregister(struct net_device *dev, struct ieee80211_pcktunnel *handler);
+
+/**
+ *
+ */
+netdev_tx_t ieee80211_inject_xmit(struct sk_buff* skb, struct net_device* dev);
+
+/**
* DOC: Hardware crypto acceleration
*
* mac80211 is capable of taking advantage of many hardware
diff --git a/net/mac80211/ieee80211_i.h b/net/mac80211/ieee80211_i.h
index 5322b4c..667c9ff 100644
--- a/net/mac80211/ieee80211_i.h
+++ b/net/mac80211/ieee80211_i.h
@@ -180,6 +180,7 @@ typedef unsigned __bitwise__ ieee80211_rx_result;
#define RX_DROP_UNUSABLE ((__force ieee80211_rx_result) 1u)
#define RX_DROP_MONITOR ((__force ieee80211_rx_result) 2u)
#define RX_QUEUED ((__force ieee80211_rx_result) 3u)
+#define RX_IGNORE_MONITOR ((__force ieee80211_rx_result) 4u)
/**
* enum ieee80211_packet_rx_flags - packet RX flags
@@ -835,6 +836,9 @@ struct ieee80211_sub_if_data {
char name[IFNAMSIZ];
+ /* Packet tunnel handlers */
+ struct ieee80211_pcktunnel __rcu *pcktunnel_handlers;
+
/* Fragment table for host-based reassembly */
struct ieee80211_fragment_entry fragments[IEEE80211_FRAGMENT_MAX];
unsigned int fragment_next;
@@ -1632,6 +1636,8 @@ netdev_tx_t ieee80211_subif_start_xmit(struct sk_buff *skb,
void __ieee80211_subif_start_xmit(struct sk_buff *skb,
struct net_device *dev,
u32 info_flags);
+netdev_tx_t ieee80211_capwap_subif_start_xmit(struct sk_buff *skb,
+ struct net_device *dev);
void ieee80211_purge_tx_queue(struct ieee80211_hw *hw,
struct sk_buff_head *skbs);
struct sk_buff *
diff --git a/net/mac80211/iface.c b/net/mac80211/iface.c
index c9e325d..15ce6e3 100644
--- a/net/mac80211/iface.c
+++ b/net/mac80211/iface.c
@@ -1952,3 +1952,59 @@ void ieee80211_iface_exit(void)
{
unregister_netdevice_notifier(&mac80211_netdev_notifier);
}
+
+static const struct net_device_ops ieee80211_capwapif_ops = {
+ .ndo_open = ieee80211_open,
+ .ndo_stop = ieee80211_stop,
+ .ndo_uninit = ieee80211_uninit,
+ .ndo_start_xmit = ieee80211_capwap_subif_start_xmit,
+ .ndo_set_rx_mode = ieee80211_set_multicast_list,
+ .ndo_change_mtu = ieee80211_change_mtu,
+ .ndo_set_mac_address = ieee80211_change_mac,
+ .ndo_select_queue = ieee80211_netdev_select_queue,
+ .ndo_get_stats64 = ieee80211_get_stats64,
+};
+
+int ieee80211_pcktunnel_register(struct net_device *dev, struct ieee80211_pcktunnel *handler)
+{
+ int ret = 0;
+ struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
+
+ dev->netdev_ops = &ieee80211_capwapif_ops;
+
+ mutex_lock(&sdata->local->iflist_mtx);
+
+ if (rcu_dereference_protected(sdata->pcktunnel_handlers, lockdep_is_held(&sdata->local->iflist_mtx))) {
+ ret = -EBUSY;
+ } else {
+ rcu_assign_pointer(sdata->pcktunnel_handlers, handler);
+ }
+
+ mutex_unlock(&sdata->local->iflist_mtx);
+ synchronize_net();
+
+ return ret;
+}
+EXPORT_SYMBOL(ieee80211_pcktunnel_register);
+
+int ieee80211_pcktunnel_deregister(struct net_device *dev, struct ieee80211_pcktunnel *handler)
+{
+ int ret = -ENODEV;
+ struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
+ struct ieee80211_pcktunnel *h;
+
+ mutex_lock(&sdata->local->iflist_mtx);
+
+ h = rcu_dereference_protected(sdata->pcktunnel_handlers, lockdep_is_held(&sdata->local->iflist_mtx));
+ if (h == handler) {
+ ret = 0;
+ rcu_assign_pointer(sdata->pcktunnel_handlers, NULL);
+ }
+
+ mutex_unlock(&sdata->local->iflist_mtx);
+ synchronize_net();
+
+ return ret;
+}
+EXPORT_SYMBOL(ieee80211_pcktunnel_deregister);
+
diff --git a/net/mac80211/rx.c b/net/mac80211/rx.c
index 82af407..29cc59b 100644
--- a/net/mac80211/rx.c
+++ b/net/mac80211/rx.c
@@ -3039,6 +3039,51 @@ ieee80211_rx_h_mgmt(struct ieee80211_rx_data *rx)
return RX_QUEUED;
}
+static ieee80211_rx_result debug_noinline
+ieee80211_rx_h_pcktunnel(struct ieee80211_rx_data *rx, struct ieee80211_rate *rate)
+{
+ struct ieee80211_pcktunnel *handler;
+
+ handler = rcu_dereference(rx->sdata->pcktunnel_handlers);
+ if (handler) {
+ u16 fc;
+ u16 fc_type;
+ int sig_dbm = 0;
+ unsigned char pckrate = 0;
+ struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
+ struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
+
+ if (ieee80211_hw_check(&rx->local->hw, SIGNAL_DBM))
+ sig_dbm = status->signal;
+
+ if (rate && !(status->flag & (RX_FLAG_HT | RX_FLAG_VHT))) {
+ int shift = 0;
+ if (status->flag & RX_FLAG_10MHZ)
+ shift = 1;
+ else if (status->flag & RX_FLAG_5MHZ)
+ shift = 2;
+ pckrate = DIV_ROUND_UP(rate->bitrate, 5 * (1 << shift));
+ }
+
+ /* Retrieve type and subtype packet */
+ fc = le16_to_cpu(hdr->frame_control);
+ fc_type = ((fc & IEEE80211_FCTL_FTYPE) >> 2);
+ if (fc_type < 3) {
+ u16 bitmask = 1 << ((fc & IEEE80211_FCTL_STYPE) >> 4);
+
+ /* Delegate packet to external handler */
+ if (handler->subtype_mask[fc_type] & bitmask) {
+ if (handler->handler(rx->sdata->dev->ifindex, rx->skb, sig_dbm, pckrate, handler->data)) {
+ return RX_IGNORE_MONITOR;
+ }
+ }
+ }
+ }
+
+ return RX_CONTINUE;
+}
+
+/* TODO: use IEEE80211_RX_FRAGMENTED */
static void ieee80211_rx_cooked_monitor(struct ieee80211_rx_data *rx,
struct ieee80211_rate *rate)
{
@@ -3118,6 +3163,7 @@ static void ieee80211_rx_handlers_result(struct ieee80211_rx_data *rx,
if (rx->sta)
rx->sta->rx_stats.dropped++;
/* fall through */
+ case RX_IGNORE_MONITOR:
case RX_CONTINUE: {
struct ieee80211_rate *rate = NULL;
struct ieee80211_supported_band *sband;
@@ -3146,7 +3192,9 @@ static void ieee80211_rx_handlers_result(struct ieee80211_rx_data *rx,
}
static void ieee80211_rx_handlers(struct ieee80211_rx_data *rx,
- struct sk_buff_head *frames)
+ struct sk_buff_head *frames,
+ struct ieee80211_rate *rate)
+
{
ieee80211_rx_result res = RX_DROP_MONITOR;
struct sk_buff *skb;
@@ -3185,6 +3233,11 @@ static void ieee80211_rx_handlers(struct ieee80211_rx_data *rx,
if (ieee80211_vif_is_mesh(&rx->sdata->vif))
CALL_RXH(ieee80211_rx_h_mesh_fwding);
#endif
+ /* special treatment */
+ res = ieee80211_rx_h_pcktunnel(rx, rate);
+ if (res != RX_CONTINUE)
+ goto rxh_next;
+
CALL_RXH(ieee80211_rx_h_amsdu)
CALL_RXH(ieee80211_rx_h_data)
@@ -3208,7 +3261,8 @@ static void ieee80211_rx_handlers(struct ieee80211_rx_data *rx,
spin_unlock_bh(&rx->local->rx_path_lock);
}
-static void ieee80211_invoke_rx_handlers(struct ieee80211_rx_data *rx)
+static void ieee80211_invoke_rx_handlers(struct ieee80211_rx_data *rx,
+ struct ieee80211_rate *rate)
{
struct sk_buff_head reorder_release;
ieee80211_rx_result res = RX_DROP_MONITOR;
@@ -3227,7 +3281,7 @@ static void ieee80211_invoke_rx_handlers(struct ieee80211_rx_data *rx)
ieee80211_rx_reorder_ampdu(rx, &reorder_release);
- ieee80211_rx_handlers(rx, &reorder_release);
+ ieee80211_rx_handlers(rx, &reorder_release, rate);
return;
rxh_next:
@@ -3273,7 +3327,7 @@ void ieee80211_release_reorder_timeout(struct sta_info *sta, int tid)
drv_event_callback(rx.local, rx.sdata, &event);
}
- ieee80211_rx_handlers(&rx, &frames);
+ ieee80211_rx_handlers(&rx, &frames, NULL);
}
/* main receive path */
@@ -3395,7 +3449,9 @@ static bool ieee80211_accept_frame(struct ieee80211_rx_data *rx)
* or not the skb was consumed.
*/
static bool ieee80211_prepare_and_rx_handle(struct ieee80211_rx_data *rx,
- struct sk_buff *skb, bool consume)
+ struct sk_buff *skb,
+ struct ieee80211_rate *rate,
+ bool consume)
{
struct ieee80211_local *local = rx->local;
struct ieee80211_sub_if_data *sdata = rx->sdata;
@@ -3418,7 +3474,7 @@ static bool ieee80211_prepare_and_rx_handle(struct ieee80211_rx_data *rx,
rx->skb = skb;
}
- ieee80211_invoke_rx_handlers(rx);
+ ieee80211_invoke_rx_handlers(rx, rate);
return true;
}
@@ -3428,7 +3484,8 @@ static bool ieee80211_prepare_and_rx_handle(struct ieee80211_rx_data *rx,
*/
static void __ieee80211_rx_handle_packet(struct ieee80211_hw *hw,
struct sk_buff *skb,
- struct napi_struct *napi)
+ struct napi_struct *napi,
+ struct ieee80211_rate *rate)
{
struct ieee80211_local *local = hw_to_local(hw);
struct ieee80211_sub_if_data *sdata;
@@ -3487,7 +3544,7 @@ static void __ieee80211_rx_handle_packet(struct ieee80211_hw *hw,
rx.sta = prev_sta;
rx.sdata = prev_sta->sdata;
- ieee80211_prepare_and_rx_handle(&rx, skb, false);
+ ieee80211_prepare_and_rx_handle(&rx, skb, rate, false);
prev_sta = sta;
}
@@ -3496,7 +3553,7 @@ static void __ieee80211_rx_handle_packet(struct ieee80211_hw *hw,
rx.sta = prev_sta;
rx.sdata = prev_sta->sdata;
- if (ieee80211_prepare_and_rx_handle(&rx, skb, true))
+ if (ieee80211_prepare_and_rx_handle(&rx, skb, rate, true))
return;
goto out;
}
@@ -3525,7 +3582,7 @@ static void __ieee80211_rx_handle_packet(struct ieee80211_hw *hw,
rx.sta = sta_info_get_bss(prev, hdr->addr2);
rx.sdata = prev;
- ieee80211_prepare_and_rx_handle(&rx, skb, false);
+ ieee80211_prepare_and_rx_handle(&rx, skb, rate, false);
prev = sdata;
}
@@ -3534,7 +3591,7 @@ static void __ieee80211_rx_handle_packet(struct ieee80211_hw *hw,
rx.sta = sta_info_get_bss(prev, hdr->addr2);
rx.sdata = prev;
- if (ieee80211_prepare_and_rx_handle(&rx, skb, true))
+ if (ieee80211_prepare_and_rx_handle(&rx, skb, rate, true))
return;
}
@@ -3646,7 +3703,7 @@ void ieee80211_rx_napi(struct ieee80211_hw *hw, struct sk_buff *skb,
ieee80211_tpt_led_trig_rx(local,
((struct ieee80211_hdr *)skb->data)->frame_control,
skb->len);
- __ieee80211_rx_handle_packet(hw, skb, napi);
+ __ieee80211_rx_handle_packet(hw, skb, napi, rate);
rcu_read_unlock();
diff --git a/net/mac80211/tx.c b/net/mac80211/tx.c
index bdc224d..3769c33 100644
--- a/net/mac80211/tx.c
+++ b/net/mac80211/tx.c
@@ -2939,6 +2939,138 @@ netdev_tx_t ieee80211_subif_start_xmit(struct sk_buff *skb,
return NETDEV_TX_OK;
}
+/*
+ * inject raw 802.11 frame, processing is mostly identical
+ * to ieee80211_monitor_start_xmit, except for the different
+ * headers
+ */
+static void __ieee80211_capwap_inject_start_xmit(struct sk_buff *skb,
+ struct net_device *dev)
+{
+ struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
+ struct ieee80211_chanctx_conf *chanctx_conf;
+ struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
+ struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
+ struct ieee80211_sub_if_data *tmp_sdata, *sdata;
+ struct cfg80211_chan_def *chandef;
+ int hdrlen;
+
+ /* check for not even having the fixed 802.11 header */
+ if (unlikely(skb->len < sizeof(struct ieee80211_hdr)))
+ goto fail; /* too short to be possibly valid */
+
+ hdrlen = ieee80211_hdrlen(hdr->frame_control);
+
+ /* does the skb contain enough to deliver on the alleged length? */
+ if (unlikely(skb->len < hdrlen))
+ goto fail; /* skb too short for claimed header length */
+
+ skb_reset_mac_header(skb);
+ /*
+ * these are just fixed to the end of the rt area since we
+ * don't have any better information and at this point, nobody cares
+ */
+ skb_reset_network_header(skb);
+ skb_reset_transport_header(skb);
+
+ /*
+ * Initialize skb->protocol if the injected frame is a data frame
+ * carrying a rfc1042 header
+ */
+ if (ieee80211_is_data(hdr->frame_control) &&
+ skb->len >= hdrlen + sizeof(rfc1042_header) + 2) {
+ u8 *payload = (u8 *)hdr + hdrlen;
+
+ if (ether_addr_equal(payload, rfc1042_header))
+ skb->protocol = cpu_to_be16((payload[6] << 8) |
+ payload[7]);
+ }
+
+ memset(info, 0, sizeof(*info));
+
+ info->flags = IEEE80211_TX_CTL_REQ_TX_STATUS |
+ IEEE80211_TX_CTL_INJECTED;
+
+
+ /*
+ * we might have set these flags later.....
+ * info->flags &= ~IEEE80211_TX_INTFL_DONT_ENCRYPT;
+ * info->flags &= ~IEEE80211_TX_CTL_DONTFRAG;
+ */
+
+ rcu_read_lock();
+
+ sdata = IEEE80211_DEV_TO_SUB_IF(dev);
+
+ chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
+ if (!chanctx_conf) {
+ tmp_sdata = rcu_dereference(local->monitor_sdata);
+ if (tmp_sdata)
+ chanctx_conf =
+ rcu_dereference(tmp_sdata->vif.chanctx_conf);
+ }
+
+ if (chanctx_conf)
+ chandef = &chanctx_conf->def;
+ else if (!local->use_chanctx)
+ chandef = &local->_oper_chandef;
+ else
+ goto fail_rcu;
+
+ /*
+ * Frame injection is not allowed if beaconing is not allowed
+ * or if we need radar detection. Beaconing is usually not allowed when
+ * the mode or operation (Adhoc, AP, Mesh) does not support DFS.
+ * Passive scan is also used in world regulatory domains where
+ * your country is not known and as such it should be treated as
+ * NO TX unless the channel is explicitly allowed in which case
+ * your current regulatory domain would not have the passive scan
+ * flag.
+ *
+ * Since AP mode uses monitor interfaces to inject/TX management
+ * frames we can make AP mode the exception to this rule once it
+ * supports radar detection as its implementation can deal with
+ * radar detection by itself. We can do that later by adding a
+ * monitor flag interfaces used for AP support.
+ */
+ if (!cfg80211_reg_can_beacon(local->hw.wiphy, chandef,
+ sdata->vif.type))
+ goto fail_rcu;
+
+ info->band = chandef->chan->band;
+ ieee80211_xmit(sdata, NULL, skb);
+ rcu_read_unlock();
+
+ return;
+
+fail_rcu:
+ rcu_read_unlock();
+fail:
+ dev_kfree_skb(skb);
+}
+
+/**
+ * ieee80211_capwap_subif_start_xmit - netif start_xmit function for 802.3 vifs
+ * @skb: packet to be sent
+ * @dev: incoming interface
+ *
+ * On failure skb will be freed.
+ */
+netdev_tx_t ieee80211_capwap_subif_start_xmit(struct sk_buff *skb,
+ struct net_device *dev)
+{
+ if (skb->protocol != htons(ETH_P_IP))
+ printk(KERN_DEBUG "capwap xmit %s: protocol: %04X, data: %p, MAC: %p\n",
+ dev->name, ntohs(skb->protocol), skb->data, skb_mac_header(skb));
+
+ if (skb->protocol == htons(ETH_P_CONTROL)) {
+ __ieee80211_capwap_inject_start_xmit(skb, dev);
+ } else
+ __ieee80211_subif_start_xmit(skb, dev, 0);
+
+ return NETDEV_TX_OK;
+}
+
struct sk_buff *
ieee80211_build_data_template(struct ieee80211_sub_if_data *sdata,
struct sk_buff *skb, u32 info_flags)
@@ -3914,3 +4046,177 @@ void __ieee80211_tx_skb_tid_band(struct ieee80211_sub_if_data *sdata,
ieee80211_xmit(sdata, NULL, skb);
local_bh_enable();
}
+
+netdev_tx_t ieee80211_inject_xmit(struct sk_buff* skb, struct net_device* dev) {
+ int multicast;
+ struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
+ struct ieee80211_chanctx_conf *chanctx_conf;
+ struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
+ struct ieee80211_sub_if_data *sdata;
+ struct cfg80211_chan_def *chandef;
+ struct ieee80211_hdr *hdr;
+ int hdrlen;
+ int queue_index;
+
+ /* */
+ if (skb->len < hdrlen) {
+ goto error;
+ }
+
+ /* */
+ skb->dev = dev;
+ skb_reset_mac_header(skb);
+ skb_reset_network_header(skb);
+ skb_reset_transport_header(skb);
+
+ hdr = (struct ieee80211_hdr *)skb->data;
+ hdrlen = ieee80211_hdrlen(hdr->frame_control);
+
+ if (skb->len < hdrlen) {
+ printk(KERN_WARNING, "droping packet for TO SMALL");
+ goto error;
+ }
+
+ /*
+ * Initialize skb->protocol if the injected frame is a data frame
+ * carrying a rfc1042 header
+ */
+ if (ieee80211_is_data(hdr->frame_control) &&
+ skb->len >= hdrlen + sizeof(rfc1042_header) + 2) {
+ u8 *payload = (u8 *)hdr + hdrlen;
+
+ if (ether_addr_equal(payload, rfc1042_header))
+ skb->protocol = cpu_to_be16((payload[6] << 8) |
+ payload[7]);
+ }
+
+ memset(info, 0, sizeof(struct ieee80211_tx_info));
+
+ rcu_read_lock();
+
+ sdata = IEEE80211_DEV_TO_SUB_IF(dev);
+
+ if (sdata->vif.type != NL80211_IFTYPE_AP) {
+ printk(KERN_WARNING, "droping packet for NOT AP");
+ goto error_rcu;
+ }
+
+ chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
+ if (!chanctx_conf) {
+ printk(KERN_WARNING, "droping packet for NO CHANTX");
+ goto error_rcu;
+ }
+
+ chandef = &chanctx_conf->def;
+
+ queue_index = ieee80211_select_queue_80211(sdata, skb, hdr);
+ skb_set_queue_mapping(skb, queue_index);
+
+ info->band = chandef->chan->band;
+ info->hw_queue =
+ sdata->vif.hw_queue[queue_index];
+
+ /*
+ * Frame injection is not allowed if beaconing is not allowed
+ * or if we need radar detection. Beaconing is usually not allowed when
+ * the mode or operation (Adhoc, AP, Mesh) does not support DFS.
+ * Passive scan is also used in world regulatory domains where
+ * your country is not known and as such it should be treated as
+ * NO TX unless the channel is explicitly allowed in which case
+ * your current regulatory domain would not have the passive scan
+ * flag.
+ *
+ * Since AP mode uses monitor interfaces to inject/TX management
+ * frames we can make AP mode the exception to this rule once it
+ * supports radar detection as its implementation can deal with
+ * radar detection by itself. We can do that later by adding a
+ * monitor flag interfaces used for AP support.
+ */
+ if (!cfg80211_reg_can_beacon(local->hw.wiphy, chandef,
+ sdata->vif.type)) {
+ printk(KERN_WARNING, "droping packet for CAN NOT BEACON");
+ goto error_rcu;
+ }
+ /* */
+ multicast = is_multicast_ether_addr(hdr->addr1);
+ if (!multicast) {
+ struct sta_info* sta = sta_info_get(sdata, hdr->addr1);
+ if (sta && test_sta_flag(sta, WLAN_STA_AUTHORIZED)) {
+ skb->pkt_type = PACKET_OTHERHOST;
+ } else {
+ printk(KERN_WARNING, "droping packet for STA not AUTHORIZED");
+ goto error_rcu;
+ }
+ } else {
+ if (ether_addr_equal_64bits(hdr->addr1, dev->broadcast)) {
+ skb->pkt_type = PACKET_BROADCAST;
+ } else {
+ skb->pkt_type = PACKET_MULTICAST;
+ }
+ }
+
+ /* */
+ if (unlikely(!multicast && skb->sk &&
+ skb_shinfo(skb)->tx_flags & SKBTX_WIFI_STATUS)) {
+ struct sk_buff *ack_skb = skb_clone_sk(skb);
+
+ if (ack_skb) {
+ unsigned long flags;
+ int id;
+ struct ieee80211_local* local = sdata->local;
+
+ spin_lock_irqsave(&local->ack_status_lock, flags);
+ id = idr_alloc(&local->ack_status_frames, ack_skb,
+ 1, 0x10000, GFP_ATOMIC);
+ spin_unlock_irqrestore(&local->ack_status_lock, flags);
+
+ if (id >= 0) {
+ info->ack_frame_id = id;
+ info->flags |= IEEE80211_TX_CTL_REQ_TX_STATUS;
+ } else {
+ kfree_skb(ack_skb);
+ }
+ }
+ }
+
+#if 0
+ /* If the skb is shared we need to obtain our own copy. */
+ if (skb_shared(skb)) {
+ struct sk_buff *tmp_skb = skb;
+
+ /* can't happen -- skb is a clone if info_id != 0 */
+ WARN_ON(info->ack_frame_id);
+
+ skb = skb_clone(skb, GFP_ATOMIC);
+ kfree_skb(tmp_skb);
+
+ if (!skb)
+ goto error_rcu;
+ }
+#endif
+
+ /* */
+ hdr->duration_id = 0;
+ hdr->seq_ctrl = 0;
+
+ /* */
+ ieee80211_tx_stats(dev, skb->len);
+
+ /* */
+/* dev->trans_start = jiffies; */
+
+ /* */
+ ieee80211_xmit(sdata, NULL, skb);
+ rcu_read_unlock();
+
+ return NETDEV_TX_OK;
+
+error_rcu:
+ rcu_read_unlock();
+
+error:
+ dev_kfree_skb(skb);
+ return NETDEV_TX_OK;
+}
+EXPORT_SYMBOL(ieee80211_inject_xmit);
+
--
2.7.0