summaryrefslogtreecommitdiff
path: root/net/mac80211/tx.c
diff options
context:
space:
mode:
authorDavid S. Miller <davem@davemloft.net>2015-03-31 16:39:04 -0400
committerDavid S. Miller <davem@davemloft.net>2015-03-31 16:39:04 -0400
commit7b6249bba940f57c20cdde793b306ca3831778c7 (patch)
tree24caf2ec9ea6fca08fe225228614807d0919b4b2 /net/mac80211/tx.c
parentfbcb21705930f2930f506149d0b8d36dfbe45107 (diff)
parent2c44be81f0fc147eed9dc63e2601318b2c007aeb (diff)
Merge tag 'mac80211-next-for-davem-2015-03-30' of git://git.kernel.org/pub/scm/linux/kernel/git/jberg/mac80211-next
Johannes Berg says: ==================== Lots of updates for net-next; along with the usual flurry of small fixes, cleanups and internal features we have: * VHT support for TDLS and IBSS (conditional on drivers though) * first TX performance improvements (the biggest will come later) * many suspend/resume (race) fixes * name_assign_type support from Tom Gundersen ==================== Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/mac80211/tx.c')
-rw-r--r--net/mac80211/tx.c266
1 files changed, 156 insertions, 110 deletions
diff --git a/net/mac80211/tx.c b/net/mac80211/tx.c
index 07bd8db00af8..9f7fb4eec37b 100644
--- a/net/mac80211/tx.c
+++ b/net/mac80211/tx.c
@@ -20,7 +20,6 @@
#include <linux/bitmap.h>
#include <linux/rcupdate.h>
#include <linux/export.h>
-#include <linux/time.h>
#include <net/net_namespace.h>
#include <net/ieee80211_radiotap.h>
#include <net/cfg80211.h>
@@ -595,23 +594,8 @@ ieee80211_tx_h_select_key(struct ieee80211_tx_data *tx)
else if (!is_multicast_ether_addr(hdr->addr1) &&
(key = rcu_dereference(tx->sdata->default_unicast_key)))
tx->key = key;
- else if (info->flags & IEEE80211_TX_CTL_INJECTED)
- tx->key = NULL;
- else if (!tx->sdata->drop_unencrypted)
- tx->key = NULL;
- else if (tx->skb->protocol == tx->sdata->control_port_protocol)
- tx->key = NULL;
- else if (ieee80211_is_robust_mgmt_frame(tx->skb) &&
- !(ieee80211_is_action(hdr->frame_control) &&
- tx->sta && test_sta_flag(tx->sta, WLAN_STA_MFP)))
- tx->key = NULL;
- else if (ieee80211_is_mgmt(hdr->frame_control) &&
- !ieee80211_is_robust_mgmt_frame(tx->skb))
+ else
tx->key = NULL;
- else {
- I802_DEBUG_INC(tx->local->tx_handlers_drop_unencrypted);
- return TX_DROP;
- }
if (tx->key) {
bool skip_hw = false;
@@ -1137,11 +1121,13 @@ static bool ieee80211_tx_prep_agg(struct ieee80211_tx_data *tx,
/*
* initialises @tx
+ * pass %NULL for the station if unknown, a valid pointer if known
+ * or an ERR_PTR() if the station is known not to exist
*/
static ieee80211_tx_result
ieee80211_tx_prepare(struct ieee80211_sub_if_data *sdata,
struct ieee80211_tx_data *tx,
- struct sk_buff *skb)
+ struct sta_info *sta, struct sk_buff *skb)
{
struct ieee80211_local *local = sdata->local;
struct ieee80211_hdr *hdr;
@@ -1164,17 +1150,22 @@ ieee80211_tx_prepare(struct ieee80211_sub_if_data *sdata,
hdr = (struct ieee80211_hdr *) skb->data;
- if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
- tx->sta = rcu_dereference(sdata->u.vlan.sta);
- if (!tx->sta && sdata->dev->ieee80211_ptr->use_4addr)
- return TX_DROP;
- } else if (info->flags & (IEEE80211_TX_CTL_INJECTED |
- IEEE80211_TX_INTFL_NL80211_FRAME_TX) ||
- tx->sdata->control_port_protocol == tx->skb->protocol) {
- tx->sta = sta_info_get_bss(sdata, hdr->addr1);
+ if (likely(sta)) {
+ if (!IS_ERR(sta))
+ tx->sta = sta;
+ } else {
+ if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
+ tx->sta = rcu_dereference(sdata->u.vlan.sta);
+ if (!tx->sta && sdata->wdev.use_4addr)
+ return TX_DROP;
+ } else if (info->flags & (IEEE80211_TX_INTFL_NL80211_FRAME_TX |
+ IEEE80211_TX_CTL_INJECTED) ||
+ tx->sdata->control_port_protocol == tx->skb->protocol) {
+ tx->sta = sta_info_get_bss(sdata, hdr->addr1);
+ }
+ if (!tx->sta && !is_multicast_ether_addr(hdr->addr1))
+ tx->sta = sta_info_get(sdata, hdr->addr1);
}
- if (!tx->sta)
- tx->sta = sta_info_get(sdata, hdr->addr1);
if (tx->sta && ieee80211_is_data_qos(hdr->frame_control) &&
!ieee80211_is_qos_nullfunc(hdr->frame_control) &&
@@ -1422,8 +1413,9 @@ bool ieee80211_tx_prepare_skb(struct ieee80211_hw *hw,
struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
struct ieee80211_tx_data tx;
+ struct sk_buff *skb2;
- if (ieee80211_tx_prepare(sdata, &tx, skb) == TX_DROP)
+ if (ieee80211_tx_prepare(sdata, &tx, NULL, skb) == TX_DROP)
return false;
info->band = band;
@@ -1440,6 +1432,14 @@ bool ieee80211_tx_prepare_skb(struct ieee80211_hw *hw,
*sta = NULL;
}
+ /* this function isn't suitable for fragmented data frames */
+ skb2 = __skb_dequeue(&tx.skbs);
+ if (WARN_ON(skb2 != skb || !skb_queue_empty(&tx.skbs))) {
+ ieee80211_free_txskb(hw, skb2);
+ ieee80211_purge_tx_queue(hw, &tx.skbs);
+ return false;
+ }
+
return true;
}
EXPORT_SYMBOL(ieee80211_tx_prepare_skb);
@@ -1448,7 +1448,8 @@ EXPORT_SYMBOL(ieee80211_tx_prepare_skb);
* Returns false if the frame couldn't be transmitted but was queued instead.
*/
static bool ieee80211_tx(struct ieee80211_sub_if_data *sdata,
- struct sk_buff *skb, bool txpending)
+ struct sta_info *sta, struct sk_buff *skb,
+ bool txpending)
{
struct ieee80211_local *local = sdata->local;
struct ieee80211_tx_data tx;
@@ -1464,7 +1465,7 @@ static bool ieee80211_tx(struct ieee80211_sub_if_data *sdata,
/* initialises tx */
led_len = skb->len;
- res_prepare = ieee80211_tx_prepare(sdata, &tx, skb);
+ res_prepare = ieee80211_tx_prepare(sdata, &tx, sta, skb);
if (unlikely(res_prepare == TX_DROP)) {
ieee80211_free_txskb(&local->hw, skb);
@@ -1520,7 +1521,8 @@ static int ieee80211_skb_resize(struct ieee80211_sub_if_data *sdata,
return 0;
}
-void ieee80211_xmit(struct ieee80211_sub_if_data *sdata, struct sk_buff *skb)
+void ieee80211_xmit(struct ieee80211_sub_if_data *sdata,
+ struct sta_info *sta, struct sk_buff *skb)
{
struct ieee80211_local *local = sdata->local;
struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
@@ -1555,7 +1557,7 @@ void ieee80211_xmit(struct ieee80211_sub_if_data *sdata, struct sk_buff *skb)
}
ieee80211_set_qos_hdr(sdata, skb);
- ieee80211_tx(sdata, skb, false);
+ ieee80211_tx(sdata, sta, skb, false);
}
static bool ieee80211_parse_tx_radiotap(struct sk_buff *skb)
@@ -1776,7 +1778,7 @@ netdev_tx_t ieee80211_monitor_start_xmit(struct sk_buff *skb,
goto fail_rcu;
info->band = chandef->chan->band;
- ieee80211_xmit(sdata, skb);
+ ieee80211_xmit(sdata, NULL, skb);
rcu_read_unlock();
return NETDEV_TX_OK;
@@ -1788,21 +1790,89 @@ fail:
return NETDEV_TX_OK; /* meaning, we dealt with the skb */
}
-/*
- * Measure Tx frame arrival time for Tx latency statistics calculation
- * A single Tx frame latency should be measured from when it is entering the
- * Kernel until we receive Tx complete confirmation indication and the skb is
- * freed.
- */
-static void ieee80211_tx_latency_start_msrmnt(struct ieee80211_local *local,
- struct sk_buff *skb)
+static inline bool ieee80211_is_tdls_setup(struct sk_buff *skb)
{
- struct ieee80211_tx_latency_bin_ranges *tx_latency;
+ u16 ethertype = (skb->data[12] << 8) | skb->data[13];
- tx_latency = rcu_dereference(local->tx_latency);
- if (!tx_latency)
- return;
- skb->tstamp = ktime_get();
+ return ethertype == ETH_P_TDLS &&
+ skb->len > 14 &&
+ skb->data[14] == WLAN_TDLS_SNAP_RFTYPE;
+}
+
+static int ieee80211_lookup_ra_sta(struct ieee80211_sub_if_data *sdata,
+ struct sk_buff *skb,
+ struct sta_info **sta_out)
+{
+ struct sta_info *sta;
+
+ switch (sdata->vif.type) {
+ case NL80211_IFTYPE_AP_VLAN:
+ sta = rcu_dereference(sdata->u.vlan.sta);
+ if (sta) {
+ *sta_out = sta;
+ return 0;
+ } else if (sdata->wdev.use_4addr) {
+ return -ENOLINK;
+ }
+ /* fall through */
+ case NL80211_IFTYPE_AP:
+ case NL80211_IFTYPE_OCB:
+ case NL80211_IFTYPE_ADHOC:
+ if (is_multicast_ether_addr(skb->data)) {
+ *sta_out = ERR_PTR(-ENOENT);
+ return 0;
+ }
+ sta = sta_info_get_bss(sdata, skb->data);
+ break;
+ case NL80211_IFTYPE_WDS:
+ sta = sta_info_get(sdata, sdata->u.wds.remote_addr);
+ break;
+#ifdef CONFIG_MAC80211_MESH
+ case NL80211_IFTYPE_MESH_POINT:
+ /* determined much later */
+ *sta_out = NULL;
+ return 0;
+#endif
+ case NL80211_IFTYPE_STATION:
+ if (sdata->wdev.wiphy->flags & WIPHY_FLAG_SUPPORTS_TDLS) {
+ sta = sta_info_get(sdata, skb->data);
+ if (sta) {
+ bool tdls_peer, tdls_auth;
+
+ tdls_peer = test_sta_flag(sta,
+ WLAN_STA_TDLS_PEER);
+ tdls_auth = test_sta_flag(sta,
+ WLAN_STA_TDLS_PEER_AUTH);
+
+ if (tdls_peer && tdls_auth) {
+ *sta_out = sta;
+ return 0;
+ }
+
+ /*
+ * TDLS link during setup - throw out frames to
+ * peer. Allow TDLS-setup frames to unauthorized
+ * peers for the special case of a link teardown
+ * after a TDLS sta is removed due to being
+ * unreachable.
+ */
+ if (tdls_peer && !tdls_auth &&
+ !ieee80211_is_tdls_setup(skb))
+ return -EINVAL;
+ }
+
+ }
+
+ sta = sta_info_get(sdata, sdata->u.mgd.bssid);
+ if (!sta)
+ return -ENOLINK;
+ break;
+ default:
+ return -EINVAL;
+ }
+
+ *sta_out = sta ?: ERR_PTR(-ENOENT);
+ return 0;
}
/**
@@ -1824,7 +1894,8 @@ static void ieee80211_tx_latency_start_msrmnt(struct ieee80211_local *local,
* Returns: the (possibly reallocated) skb or an ERR_PTR() code
*/
static struct sk_buff *ieee80211_build_hdr(struct ieee80211_sub_if_data *sdata,
- struct sk_buff *skb, u32 info_flags)
+ struct sk_buff *skb, u32 info_flags,
+ struct sta_info *sta)
{
struct ieee80211_local *local = sdata->local;
struct ieee80211_tx_info *info;
@@ -1837,9 +1908,8 @@ static struct sk_buff *ieee80211_build_hdr(struct ieee80211_sub_if_data *sdata,
const u8 *encaps_data;
int encaps_len, skip_header_bytes;
int nh_pos, h_pos;
- struct sta_info *sta = NULL;
- bool wme_sta = false, authorized = false, tdls_auth = false;
- bool tdls_peer = false, tdls_setup_frame = false;
+ bool wme_sta = false, authorized = false;
+ bool tdls_peer;
bool multicast;
u16 info_id = 0;
struct ieee80211_chanctx_conf *chanctx_conf;
@@ -1847,6 +1917,9 @@ static struct sk_buff *ieee80211_build_hdr(struct ieee80211_sub_if_data *sdata,
enum ieee80211_band band;
int ret;
+ if (IS_ERR(sta))
+ sta = NULL;
+
/* convert Ethernet header to proper 802.11 header (based on
* operation mode) */
ethertype = (skb->data[12] << 8) | skb->data[13];
@@ -1854,8 +1927,7 @@ static struct sk_buff *ieee80211_build_hdr(struct ieee80211_sub_if_data *sdata,
switch (sdata->vif.type) {
case NL80211_IFTYPE_AP_VLAN:
- sta = rcu_dereference(sdata->u.vlan.sta);
- if (sta) {
+ if (sdata->wdev.use_4addr) {
fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS);
/* RA TA DA SA */
memcpy(hdr.addr1, sta->sta.addr, ETH_ALEN);
@@ -1874,7 +1946,7 @@ static struct sk_buff *ieee80211_build_hdr(struct ieee80211_sub_if_data *sdata,
goto free;
}
band = chanctx_conf->def.chan->band;
- if (sta)
+ if (sdata->wdev.use_4addr)
break;
/* fall through */
case NL80211_IFTYPE_AP:
@@ -1978,38 +2050,10 @@ static struct sk_buff *ieee80211_build_hdr(struct ieee80211_sub_if_data *sdata,
break;
#endif
case NL80211_IFTYPE_STATION:
- if (sdata->wdev.wiphy->flags & WIPHY_FLAG_SUPPORTS_TDLS) {
- sta = sta_info_get(sdata, skb->data);
- if (sta) {
- authorized = test_sta_flag(sta,
- WLAN_STA_AUTHORIZED);
- wme_sta = sta->sta.wme;
- tdls_peer = test_sta_flag(sta,
- WLAN_STA_TDLS_PEER);
- tdls_auth = test_sta_flag(sta,
- WLAN_STA_TDLS_PEER_AUTH);
- }
-
- if (tdls_peer)
- tdls_setup_frame =
- ethertype == ETH_P_TDLS &&
- skb->len > 14 &&
- skb->data[14] == WLAN_TDLS_SNAP_RFTYPE;
- }
+ /* we already did checks when looking up the RA STA */
+ tdls_peer = test_sta_flag(sta, WLAN_STA_TDLS_PEER);
- /*
- * TDLS link during setup - throw out frames to peer. We allow
- * TDLS-setup frames to unauthorized peers for the special case
- * of a link teardown after a TDLS sta is removed due to being
- * unreachable.
- */
- if (tdls_peer && !tdls_auth && !tdls_setup_frame) {
- ret = -EINVAL;
- goto free;
- }
-
- /* send direct packets to authorized TDLS peers */
- if (tdls_peer && tdls_auth) {
+ if (tdls_peer) {
/* DA SA BSSID */
memcpy(hdr.addr1, skb->data, ETH_ALEN);
memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
@@ -2071,26 +2115,19 @@ static struct sk_buff *ieee80211_build_hdr(struct ieee80211_sub_if_data *sdata,
goto free;
}
- /*
- * There's no need to try to look up the destination
- * if it is a multicast address (which can only happen
- * in AP mode)
- */
multicast = is_multicast_ether_addr(hdr.addr1);
- if (!multicast) {
- sta = sta_info_get(sdata, hdr.addr1);
- if (sta) {
- authorized = test_sta_flag(sta, WLAN_STA_AUTHORIZED);
- wme_sta = sta->sta.wme;
- }
- }
- /* For mesh, the use of the QoS header is mandatory */
- if (ieee80211_vif_is_mesh(&sdata->vif))
+ /* sta is always NULL for mesh */
+ if (sta) {
+ authorized = test_sta_flag(sta, WLAN_STA_AUTHORIZED);
+ wme_sta = sta->sta.wme;
+ } else if (ieee80211_vif_is_mesh(&sdata->vif)) {
+ /* For mesh, the use of the QoS header is mandatory */
wme_sta = true;
+ }
- /* receiver and we are QoS enabled, use a QoS type frame */
- if (wme_sta && local->hw.queues >= IEEE80211_NUM_ACS) {
+ /* receiver does QoS (which also means we do) use it */
+ if (wme_sta) {
fc |= cpu_to_le16(IEEE80211_STYPE_QOS_DATA);
hdrlen += 2;
}
@@ -2260,7 +2297,7 @@ void __ieee80211_subif_start_xmit(struct sk_buff *skb,
u32 info_flags)
{
struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
- struct ieee80211_local *local = sdata->local;
+ struct sta_info *sta;
if (unlikely(skb->len < ETH_HLEN)) {
kfree_skb(skb);
@@ -2269,10 +2306,12 @@ void __ieee80211_subif_start_xmit(struct sk_buff *skb,
rcu_read_lock();
- /* Measure frame arrival for Tx latency statistics calculation */
- ieee80211_tx_latency_start_msrmnt(local, skb);
+ if (ieee80211_lookup_ra_sta(sdata, skb, &sta)) {
+ kfree_skb(skb);
+ goto out;
+ }
- skb = ieee80211_build_hdr(sdata, skb, info_flags);
+ skb = ieee80211_build_hdr(sdata, skb, info_flags, sta);
if (IS_ERR(skb))
goto out;
@@ -2280,7 +2319,7 @@ void __ieee80211_subif_start_xmit(struct sk_buff *skb,
dev->stats.tx_bytes += skb->len;
dev->trans_start = jiffies;
- ieee80211_xmit(sdata, skb);
+ ieee80211_xmit(sdata, sta, skb);
out:
rcu_read_unlock();
}
@@ -2308,10 +2347,17 @@ ieee80211_build_data_template(struct ieee80211_sub_if_data *sdata,
.local = sdata->local,
.sdata = sdata,
};
+ struct sta_info *sta;
rcu_read_lock();
- skb = ieee80211_build_hdr(sdata, skb, info_flags);
+ if (ieee80211_lookup_ra_sta(sdata, skb, &sta)) {
+ kfree_skb(skb);
+ skb = ERR_PTR(-EINVAL);
+ goto out;
+ }
+
+ skb = ieee80211_build_hdr(sdata, skb, info_flags, sta);
if (IS_ERR(skb))
goto out;
@@ -2369,7 +2415,7 @@ static bool ieee80211_tx_pending_skb(struct ieee80211_local *local,
return true;
}
info->band = chanctx_conf->def.chan->band;
- result = ieee80211_tx(sdata, skb, true);
+ result = ieee80211_tx(sdata, NULL, skb, true);
} else {
struct sk_buff_head skbs;
@@ -3107,7 +3153,7 @@ ieee80211_get_buffered_bc(struct ieee80211_hw *hw,
if (sdata->vif.type == NL80211_IFTYPE_AP)
sdata = IEEE80211_DEV_TO_SUB_IF(skb->dev);
- if (!ieee80211_tx_prepare(sdata, &tx, skb))
+ if (!ieee80211_tx_prepare(sdata, &tx, NULL, skb))
break;
dev_kfree_skb_any(skb);
}
@@ -3239,6 +3285,6 @@ void __ieee80211_tx_skb_tid_band(struct ieee80211_sub_if_data *sdata,
*/
local_bh_disable();
IEEE80211_SKB_CB(skb)->band = band;
- ieee80211_xmit(sdata, skb);
+ ieee80211_xmit(sdata, NULL, skb);
local_bh_enable();
}