146 lines
3.6 KiB
C
146 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 const char llc_ip_hdr[8] = {0xAA, 0xAA, 0x3, 0, 0, 0, 0x08, 0};
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/* Given a data frame determine the 802.1p/1d tag to use. */
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static unsigned int classify_1d(struct sk_buff *skb)
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{
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unsigned int dscp;
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/* skb->priority values from 256->263 are magic values to
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* directly indicate a specific 802.1d priority. This is used
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* to allow 802.1d priority to be passed directly in from VLAN
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* tags, etc.
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*/
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if (skb->priority >= 256 && skb->priority <= 263)
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return skb->priority - 256;
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switch (skb->protocol) {
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case htons(ETH_P_IP):
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dscp = ip_hdr(skb)->tos & 0xfc;
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break;
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default:
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return 0;
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}
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return dscp >> 5;
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}
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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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static u16 classify80211(struct ieee80211_local *local, struct sk_buff *skb)
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{
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struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
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if (!ieee80211_is_data(hdr->frame_control)) {
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/* management frames go on AC_VO queue, but are sent
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* without QoS control fields */
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return 0;
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}
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if (0 /* injected */) {
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/* use AC from radiotap */
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}
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if (!ieee80211_is_data_qos(hdr->frame_control)) {
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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 = classify_1d(skb);
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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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u16 ieee80211_select_queue(struct net_device *dev, struct sk_buff *skb)
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{
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struct ieee80211_master_priv *mpriv = netdev_priv(dev);
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struct ieee80211_local *local = mpriv->local;
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struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
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u16 queue;
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u8 tid;
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queue = classify80211(local, skb);
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if (unlikely(queue >= local->hw.queues))
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queue = local->hw.queues - 1;
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/*
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* Now we know the 1d priority, fill in the QoS header if
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* there is one (and we haven't done this before).
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*/
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if (!skb->requeue && 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;
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tid = skb->priority & IEEE80211_QOS_CTL_TAG1D_MASK;
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if (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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return queue;
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}
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