281 lines
6.2 KiB
C
281 lines
6.2 KiB
C
/*
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* Copyright 2004, Instant802 Networks, Inc.
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* Copyright 2013-2014 Intel Mobile Communications GmbH
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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] = {
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IEEE80211_AC_BE,
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IEEE80211_AC_BK,
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IEEE80211_AC_BK,
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IEEE80211_AC_BE,
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IEEE80211_AC_VI,
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IEEE80211_AC_VI,
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IEEE80211_AC_VO,
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IEEE80211_AC_VO
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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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/**
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* ieee80211_fix_reserved_tid - return the TID to use if this one is reserved
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* @tid: the assumed-reserved TID
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*
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* Returns: the alternative TID to use, or 0 on error
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*/
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static inline u8 ieee80211_fix_reserved_tid(u8 tid)
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{
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switch (tid) {
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case 0:
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return 3;
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case 1:
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return 2;
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case 2:
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return 1;
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case 3:
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return 0;
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case 4:
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return 5;
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case 5:
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return 4;
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case 6:
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return 7;
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case 7:
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return 6;
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}
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return 0;
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}
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static u16 ieee80211_downgrade_queue(struct ieee80211_sub_if_data *sdata,
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struct sta_info *sta, struct sk_buff *skb)
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{
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struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
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/* in case we are a client verify acm is not set for this ac */
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while (sdata->wmm_acm & BIT(skb->priority)) {
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int ac = ieee802_1d_to_ac[skb->priority];
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if (ifmgd->tx_tspec[ac].admitted_time &&
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skb->priority == ifmgd->tx_tspec[ac].up)
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return ac;
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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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/* Check to see if this is a reserved TID */
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if (sta && sta->reserved_tid == skb->priority)
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skb->priority = ieee80211_fix_reserved_tid(skb->priority);
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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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/* Indicate which queue to use for this fully formed 802.11 frame */
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u16 ieee80211_select_queue_80211(struct ieee80211_sub_if_data *sdata,
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struct sk_buff *skb,
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struct ieee80211_hdr *hdr)
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{
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struct ieee80211_local *local = sdata->local;
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u8 *p;
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if (local->hw.queues < IEEE80211_NUM_ACS)
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return 0;
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if (!ieee80211_is_data(hdr->frame_control)) {
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skb->priority = 7;
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return ieee802_1d_to_ac[skb->priority];
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}
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if (!ieee80211_is_data_qos(hdr->frame_control)) {
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skb->priority = 0;
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return ieee802_1d_to_ac[skb->priority];
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}
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p = ieee80211_get_qos_ctl(hdr);
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skb->priority = *p & IEEE80211_QOS_CTL_TAG1D_MASK;
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return ieee80211_downgrade_queue(sdata, NULL, skb);
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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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const u8 *ra = NULL;
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bool qos = false;
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struct mac80211_qos_map *qos_map;
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u16 ret;
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if (local->hw.queues < IEEE80211_NUM_ACS || skb->len < 6) {
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skb->priority = 0; /* required for correct WPA/11i MIC */
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return 0;
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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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sta = rcu_dereference(sdata->u.vlan.sta);
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if (sta) {
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qos = sta->sta.wme;
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break;
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}
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/* fall through */
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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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qos = true;
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break;
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#endif
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case NL80211_IFTYPE_STATION:
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/* might be a TDLS station */
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sta = sta_info_get(sdata, skb->data);
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if (sta)
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qos = sta->sta.wme;
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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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case NL80211_IFTYPE_OCB:
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/* all stations are required to support WME */
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qos = true;
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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(sdata, ra);
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if (sta)
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qos = sta->sta.wme;
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}
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if (!qos) {
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skb->priority = 0; /* required for correct WPA/11i MIC */
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ret = IEEE80211_AC_BE;
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goto out;
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}
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if (skb->protocol == sdata->control_port_protocol) {
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skb->priority = 7;
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goto downgrade;
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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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qos_map = rcu_dereference(sdata->qos_map);
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skb->priority = cfg80211_classify8021d(skb, qos_map ?
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&qos_map->qos_map : NULL);
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downgrade:
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ret = ieee80211_downgrade_queue(sdata, sta, skb);
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out:
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rcu_read_unlock();
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return ret;
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}
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/**
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* ieee80211_set_qos_hdr - Fill in the QoS header if there is one.
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*
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* @sdata: local subif
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* @skb: packet to be updated
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*/
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void ieee80211_set_qos_hdr(struct ieee80211_sub_if_data *sdata,
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struct sk_buff *skb)
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{
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struct ieee80211_hdr *hdr = (void *)skb->data;
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struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
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u8 tid = skb->priority & IEEE80211_QOS_CTL_TAG1D_MASK;
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u8 flags;
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u8 *p;
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if (!ieee80211_is_data_qos(hdr->frame_control))
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return;
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p = ieee80211_get_qos_ctl(hdr);
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/* set up the first byte */
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/*
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* preserve everything but the TID and ACK policy
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* (which we both write here)
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*/
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flags = *p & ~(IEEE80211_QOS_CTL_TID_MASK |
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IEEE80211_QOS_CTL_ACK_POLICY_MASK);
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if (is_multicast_ether_addr(hdr->addr1) ||
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sdata->noack_map & BIT(tid)) {
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flags |= IEEE80211_QOS_CTL_ACK_POLICY_NOACK;
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info->flags |= IEEE80211_TX_CTL_NO_ACK;
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}
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*p = flags | tid;
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/* set up the second byte */
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p++;
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if (ieee80211_vif_is_mesh(&sdata->vif)) {
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/* preserve RSPI and Mesh PS Level bit */
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*p &= ((IEEE80211_QOS_CTL_RSPI |
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IEEE80211_QOS_CTL_MESH_PS_LEVEL) >> 8);
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/* Nulls don't have a mesh header (frame body) */
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if (!ieee80211_is_qos_nullfunc(hdr->frame_control))
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*p |= (IEEE80211_QOS_CTL_MESH_CONTROL_PRESENT >> 8);
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} else {
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*p = 0;
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}
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}
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