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-rw-r--r--net/mac80211/wme.c280
1 files changed, 280 insertions, 0 deletions
diff --git a/net/mac80211/wme.c b/net/mac80211/wme.c
new file mode 100644
index 000000000..5f7c96368
--- /dev/null
+++ b/net/mac80211/wme.c
@@ -0,0 +1,280 @@
+/*
+ * Copyright 2004, Instant802 Networks, Inc.
+ * Copyright 2013-2014 Intel Mobile Communications GmbH
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#include <linux/netdevice.h>
+#include <linux/skbuff.h>
+#include <linux/module.h>
+#include <linux/if_arp.h>
+#include <linux/types.h>
+#include <net/ip.h>
+#include <net/pkt_sched.h>
+
+#include <net/mac80211.h>
+#include "ieee80211_i.h"
+#include "wme.h"
+
+/* Default mapping in classifier to work with default
+ * queue setup.
+ */
+const int ieee802_1d_to_ac[8] = {
+ IEEE80211_AC_BE,
+ IEEE80211_AC_BK,
+ IEEE80211_AC_BK,
+ IEEE80211_AC_BE,
+ IEEE80211_AC_VI,
+ IEEE80211_AC_VI,
+ IEEE80211_AC_VO,
+ IEEE80211_AC_VO
+};
+
+static int wme_downgrade_ac(struct sk_buff *skb)
+{
+ switch (skb->priority) {
+ case 6:
+ case 7:
+ skb->priority = 5; /* VO -> VI */
+ return 0;
+ case 4:
+ case 5:
+ skb->priority = 3; /* VI -> BE */
+ return 0;
+ case 0:
+ case 3:
+ skb->priority = 2; /* BE -> BK */
+ return 0;
+ default:
+ return -1;
+ }
+}
+
+/**
+ * ieee80211_fix_reserved_tid - return the TID to use if this one is reserved
+ * @tid: the assumed-reserved TID
+ *
+ * Returns: the alternative TID to use, or 0 on error
+ */
+static inline u8 ieee80211_fix_reserved_tid(u8 tid)
+{
+ switch (tid) {
+ case 0:
+ return 3;
+ case 1:
+ return 2;
+ case 2:
+ return 1;
+ case 3:
+ return 0;
+ case 4:
+ return 5;
+ case 5:
+ return 4;
+ case 6:
+ return 7;
+ case 7:
+ return 6;
+ }
+
+ return 0;
+}
+
+static u16 ieee80211_downgrade_queue(struct ieee80211_sub_if_data *sdata,
+ struct sta_info *sta, struct sk_buff *skb)
+{
+ struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
+
+ /* in case we are a client verify acm is not set for this ac */
+ while (sdata->wmm_acm & BIT(skb->priority)) {
+ int ac = ieee802_1d_to_ac[skb->priority];
+
+ if (ifmgd->tx_tspec[ac].admitted_time &&
+ skb->priority == ifmgd->tx_tspec[ac].up)
+ return ac;
+
+ if (wme_downgrade_ac(skb)) {
+ /*
+ * This should not really happen. The AP has marked all
+ * lower ACs to require admission control which is not
+ * a reasonable configuration. Allow the frame to be
+ * transmitted using AC_BK as a workaround.
+ */
+ break;
+ }
+ }
+
+ /* Check to see if this is a reserved TID */
+ if (sta && sta->reserved_tid == skb->priority)
+ skb->priority = ieee80211_fix_reserved_tid(skb->priority);
+
+ /* look up which queue to use for frames with this 1d tag */
+ return ieee802_1d_to_ac[skb->priority];
+}
+
+/* Indicate which queue to use for this fully formed 802.11 frame */
+u16 ieee80211_select_queue_80211(struct ieee80211_sub_if_data *sdata,
+ struct sk_buff *skb,
+ struct ieee80211_hdr *hdr)
+{
+ struct ieee80211_local *local = sdata->local;
+ u8 *p;
+
+ if (local->hw.queues < IEEE80211_NUM_ACS)
+ return 0;
+
+ if (!ieee80211_is_data(hdr->frame_control)) {
+ skb->priority = 7;
+ return ieee802_1d_to_ac[skb->priority];
+ }
+ if (!ieee80211_is_data_qos(hdr->frame_control)) {
+ skb->priority = 0;
+ return ieee802_1d_to_ac[skb->priority];
+ }
+
+ p = ieee80211_get_qos_ctl(hdr);
+ skb->priority = *p & IEEE80211_QOS_CTL_TAG1D_MASK;
+
+ return ieee80211_downgrade_queue(sdata, NULL, skb);
+}
+
+/* Indicate which queue to use. */
+u16 ieee80211_select_queue(struct ieee80211_sub_if_data *sdata,
+ struct sk_buff *skb)
+{
+ struct ieee80211_local *local = sdata->local;
+ struct sta_info *sta = NULL;
+ const u8 *ra = NULL;
+ bool qos = false;
+ struct mac80211_qos_map *qos_map;
+ u16 ret;
+
+ if (local->hw.queues < IEEE80211_NUM_ACS || skb->len < 6) {
+ skb->priority = 0; /* required for correct WPA/11i MIC */
+ return 0;
+ }
+
+ rcu_read_lock();
+ switch (sdata->vif.type) {
+ case NL80211_IFTYPE_AP_VLAN:
+ sta = rcu_dereference(sdata->u.vlan.sta);
+ if (sta) {
+ qos = sta->sta.wme;
+ break;
+ }
+ /* fall through */
+ case NL80211_IFTYPE_AP:
+ ra = skb->data;
+ break;
+ case NL80211_IFTYPE_WDS:
+ ra = sdata->u.wds.remote_addr;
+ break;
+#ifdef CONFIG_MAC80211_MESH
+ case NL80211_IFTYPE_MESH_POINT:
+ qos = true;
+ break;
+#endif
+ case NL80211_IFTYPE_STATION:
+ /* might be a TDLS station */
+ sta = sta_info_get(sdata, skb->data);
+ if (sta)
+ qos = sta->sta.wme;
+
+ ra = sdata->u.mgd.bssid;
+ break;
+ case NL80211_IFTYPE_ADHOC:
+ ra = skb->data;
+ break;
+ case NL80211_IFTYPE_OCB:
+ /* all stations are required to support WME */
+ qos = true;
+ break;
+ default:
+ break;
+ }
+
+ if (!sta && ra && !is_multicast_ether_addr(ra)) {
+ sta = sta_info_get(sdata, ra);
+ if (sta)
+ qos = sta->sta.wme;
+ }
+
+ if (!qos) {
+ skb->priority = 0; /* required for correct WPA/11i MIC */
+ ret = IEEE80211_AC_BE;
+ goto out;
+ }
+
+ if (skb->protocol == sdata->control_port_protocol) {
+ skb->priority = 7;
+ goto downgrade;
+ }
+
+ /* use the data classifier to determine what 802.1d tag the
+ * data frame has */
+ qos_map = rcu_dereference(sdata->qos_map);
+ skb->priority = cfg80211_classify8021d(skb, qos_map ?
+ &qos_map->qos_map : NULL);
+
+ downgrade:
+ ret = ieee80211_downgrade_queue(sdata, sta, skb);
+ out:
+ rcu_read_unlock();
+ return ret;
+}
+
+/**
+ * ieee80211_set_qos_hdr - Fill in the QoS header if there is one.
+ *
+ * @sdata: local subif
+ * @skb: packet to be updated
+ */
+void ieee80211_set_qos_hdr(struct ieee80211_sub_if_data *sdata,
+ struct sk_buff *skb)
+{
+ struct ieee80211_hdr *hdr = (void *)skb->data;
+ struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
+ u8 tid = skb->priority & IEEE80211_QOS_CTL_TAG1D_MASK;
+ u8 flags;
+ u8 *p;
+
+ if (!ieee80211_is_data_qos(hdr->frame_control))
+ return;
+
+ p = ieee80211_get_qos_ctl(hdr);
+
+ /* set up the first byte */
+
+ /*
+ * preserve everything but the TID and ACK policy
+ * (which we both write here)
+ */
+ flags = *p & ~(IEEE80211_QOS_CTL_TID_MASK |
+ IEEE80211_QOS_CTL_ACK_POLICY_MASK);
+
+ if (is_multicast_ether_addr(hdr->addr1) ||
+ sdata->noack_map & BIT(tid)) {
+ flags |= IEEE80211_QOS_CTL_ACK_POLICY_NOACK;
+ info->flags |= IEEE80211_TX_CTL_NO_ACK;
+ }
+
+ *p = flags | tid;
+
+ /* set up the second byte */
+ p++;
+
+ if (ieee80211_vif_is_mesh(&sdata->vif)) {
+ /* preserve RSPI and Mesh PS Level bit */
+ *p &= ((IEEE80211_QOS_CTL_RSPI |
+ IEEE80211_QOS_CTL_MESH_PS_LEVEL) >> 8);
+
+ /* Nulls don't have a mesh header (frame body) */
+ if (!ieee80211_is_qos_nullfunc(hdr->frame_control))
+ *p |= (IEEE80211_QOS_CTL_MESH_CONTROL_PRESENT >> 8);
+ } else {
+ *p = 0;
+ }
+}
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