153 lines
3.6 KiB
C
153 lines
3.6 KiB
C
/*
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* Copyright 2004, Instant802 Networks, Inc.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#include <linux/netdevice.h>
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#include <linux/skbuff.h>
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#include <linux/module.h>
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#include <linux/if_arp.h>
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#include <linux/types.h>
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#include <net/ip.h>
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#include <net/pkt_sched.h>
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#include <net/mac80211.h>
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#include "ieee80211_i.h"
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#include "wme.h"
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/* Default mapping in classifier to work with default
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* queue setup.
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*/
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const int ieee802_1d_to_ac[8] = { 2, 3, 3, 2, 1, 1, 0, 0 };
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static int wme_downgrade_ac(struct sk_buff *skb)
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{
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switch (skb->priority) {
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case 6:
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case 7:
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skb->priority = 5; /* VO -> VI */
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return 0;
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case 4:
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case 5:
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skb->priority = 3; /* VI -> BE */
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return 0;
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case 0:
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case 3:
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skb->priority = 2; /* BE -> BK */
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return 0;
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default:
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return -1;
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}
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}
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/* Indicate which queue to use. */
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u16 ieee80211_select_queue(struct ieee80211_sub_if_data *sdata,
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struct sk_buff *skb)
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{
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struct ieee80211_local *local = sdata->local;
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struct sta_info *sta = NULL;
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u32 sta_flags = 0;
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const u8 *ra = NULL;
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bool qos = false;
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if (local->hw.queues < 4 || skb->len < 6) {
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skb->priority = 0; /* required for correct WPA/11i MIC */
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return min_t(u16, local->hw.queues - 1,
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ieee802_1d_to_ac[skb->priority]);
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}
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rcu_read_lock();
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switch (sdata->vif.type) {
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case NL80211_IFTYPE_AP_VLAN:
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case NL80211_IFTYPE_AP:
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ra = skb->data;
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break;
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case NL80211_IFTYPE_WDS:
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ra = sdata->u.wds.remote_addr;
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break;
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#ifdef CONFIG_MAC80211_MESH
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case NL80211_IFTYPE_MESH_POINT:
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/*
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* XXX: This is clearly broken ... but already was before,
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* because ieee80211_fill_mesh_addresses() would clear A1
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* except for multicast addresses.
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*/
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break;
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#endif
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case NL80211_IFTYPE_STATION:
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ra = sdata->u.mgd.bssid;
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break;
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case NL80211_IFTYPE_ADHOC:
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ra = skb->data;
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break;
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default:
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break;
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}
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if (!sta && ra && !is_multicast_ether_addr(ra)) {
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sta = sta_info_get(local, ra);
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if (sta)
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sta_flags = get_sta_flags(sta);
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}
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if (sta_flags & WLAN_STA_WME)
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qos = true;
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rcu_read_unlock();
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if (!qos) {
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skb->priority = 0; /* required for correct WPA/11i MIC */
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return ieee802_1d_to_ac[skb->priority];
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}
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/* use the data classifier to determine what 802.1d tag the
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* data frame has */
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skb->priority = cfg80211_classify8021d(skb);
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return ieee80211_downgrade_queue(local, skb);
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}
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u16 ieee80211_downgrade_queue(struct ieee80211_local *local,
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struct sk_buff *skb)
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{
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/* in case we are a client verify acm is not set for this ac */
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while (unlikely(local->wmm_acm & BIT(skb->priority))) {
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if (wme_downgrade_ac(skb)) {
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/*
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* This should not really happen. The AP has marked all
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* lower ACs to require admission control which is not
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* a reasonable configuration. Allow the frame to be
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* transmitted using AC_BK as a workaround.
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*/
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break;
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}
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}
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/* look up which queue to use for frames with this 1d tag */
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return ieee802_1d_to_ac[skb->priority];
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}
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void ieee80211_set_qos_hdr(struct ieee80211_local *local, struct sk_buff *skb)
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{
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struct ieee80211_hdr *hdr = (void *)skb->data;
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/* Fill in the QoS header if there is one. */
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if (ieee80211_is_data_qos(hdr->frame_control)) {
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u8 *p = ieee80211_get_qos_ctl(hdr);
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u8 ack_policy = 0, tid;
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tid = skb->priority & IEEE80211_QOS_CTL_TAG1D_MASK;
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if (unlikely(local->wifi_wme_noack_test))
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ack_policy |= QOS_CONTROL_ACK_POLICY_NOACK <<
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QOS_CONTROL_ACK_POLICY_SHIFT;
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/* qos header is 2 bytes, second reserved */
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*p++ = ack_policy | tid;
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*p = 0;
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}
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}
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