LXR linux/net/mac80211/wme.c

   1// SPDX-License-Identifier: GPL-2.0-only
   2/*
   3 * Copyright 2004, Instant802 Networks, Inc.
   4 * Copyright 2013-2014  Intel Mobile Communications GmbH
   5 */
   6
   7#include <linux/netdevice.h>
   8#include <linux/skbuff.h>
   9#include <linux/module.h>
  10#include <linux/if_arp.h>
  11#include <linux/types.h>
  12#include <net/ip.h>
  13#include <net/pkt_sched.h>
  14
  15#include <net/mac80211.h>
  16#include "ieee80211_i.h"
  17#include "wme.h"
  18
  19/* Default mapping in classifier to work with default
  20 * queue setup.
  21 */
  22const int ieee802_1d_to_ac[8] = {
  23        IEEE80211_AC_BE,
  24        IEEE80211_AC_BK,
  25        IEEE80211_AC_BK,
  26        IEEE80211_AC_BE,
  27        IEEE80211_AC_VI,
  28        IEEE80211_AC_VI,
  29        IEEE80211_AC_VO,
  30        IEEE80211_AC_VO
  31};
  32
  33static int wme_downgrade_ac(struct sk_buff *skb)
  34{
  35        switch (skb->priority) {
  36        case 6:
  37        case 7:
  38                skb->priority = 5; /* VO -> VI */
  39                return 0;
  40        case 4:
  41        case 5:
  42                skb->priority = 3; /* VI -> BE */
  43                return 0;
  44        case 0:
  45        case 3:
  46                skb->priority = 2; /* BE -> BK */
  47                return 0;
  48        default:
  49                return -1;
  50        }
  51}
  52
  53/**
  54 * ieee80211_fix_reserved_tid - return the TID to use if this one is reserved
  55 * @tid: the assumed-reserved TID
  56 *
  57 * Returns: the alternative TID to use, or 0 on error
  58 */
  59static inline u8 ieee80211_fix_reserved_tid(u8 tid)
  60{
  61        switch (tid) {
  62        case 0:
  63                return 3;
  64        case 1:
  65                return 2;
  66        case 2:
  67                return 1;
  68        case 3:
  69                return 0;
  70        case 4:
  71                return 5;
  72        case 5:
  73                return 4;
  74        case 6:
  75                return 7;
  76        case 7:
  77                return 6;
  78        }
  79
  80        return 0;
  81}
  82
  83static u16 ieee80211_downgrade_queue(struct ieee80211_sub_if_data *sdata,
  84                                     struct sta_info *sta, struct sk_buff *skb)
  85{
  86        struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
  87
  88        /* in case we are a client verify acm is not set for this ac */
  89        while (sdata->wmm_acm & BIT(skb->priority)) {
  90                int ac = ieee802_1d_to_ac[skb->priority];
  91
  92                if (ifmgd->tx_tspec[ac].admitted_time &&
  93                    skb->priority == ifmgd->tx_tspec[ac].up)
  94                        return ac;
  95
  96                if (wme_downgrade_ac(skb)) {
  97                        /*
  98                         * This should not really happen. The AP has marked all
  99                         * lower ACs to require admission control which is not
 100                         * a reasonable configuration. Allow the frame to be
 101                         * transmitted using AC_BK as a workaround.
 102                         */
 103                        break;
 104                }
 105        }
 106
 107        /* Check to see if this is a reserved TID */
 108        if (sta && sta->reserved_tid == skb->priority)
 109                skb->priority = ieee80211_fix_reserved_tid(skb->priority);
 110
 111        /* look up which queue to use for frames with this 1d tag */
 112        return ieee802_1d_to_ac[skb->priority];
 113}
 114
 115/* Indicate which queue to use for this fully formed 802.11 frame */
 116u16 ieee80211_select_queue_80211(struct ieee80211_sub_if_data *sdata,
 117                                 struct sk_buff *skb,
 118                                 struct ieee80211_hdr *hdr)
 119{
 120        struct ieee80211_local *local = sdata->local;
 121        u8 *p;
 122
 123        if (local->hw.queues < IEEE80211_NUM_ACS)
 124                return 0;
 125
 126        if (!ieee80211_is_data(hdr->frame_control)) {
 127                skb->priority = 7;
 128                return ieee802_1d_to_ac[skb->priority];
 129        }
 130        if (!ieee80211_is_data_qos(hdr->frame_control)) {
 131                skb->priority = 0;
 132                return ieee802_1d_to_ac[skb->priority];
 133        }
 134
 135        p = ieee80211_get_qos_ctl(hdr);
 136        skb->priority = *p & IEEE80211_QOS_CTL_TAG1D_MASK;
 137
 138        return ieee80211_downgrade_queue(sdata, NULL, skb);
 139}
 140
 141u16 __ieee80211_select_queue(struct ieee80211_sub_if_data *sdata,
 142                             struct sta_info *sta, struct sk_buff *skb)
 143{
 144        struct mac80211_qos_map *qos_map;
 145        bool qos;
 146
 147        /* all mesh/ocb stations are required to support WME */
 148        if (sdata->vif.type == NL80211_IFTYPE_MESH_POINT ||
 149            sdata->vif.type == NL80211_IFTYPE_OCB)
 150                qos = true;
 151        else if (sta)
 152                qos = sta->sta.wme;
 153        else
 154                qos = false;
 155
 156        if (!qos) {
 157                skb->priority = 0; /* required for correct WPA/11i MIC */
 158                return IEEE80211_AC_BE;
 159        }
 160
 161        if (skb->protocol == sdata->control_port_protocol) {
 162                skb->priority = 7;
 163                goto downgrade;
 164        }
 165
 166        /* use the data classifier to determine what 802.1d tag the
 167         * data frame has */
 168        qos_map = rcu_dereference(sdata->qos_map);
 169        skb->priority = cfg80211_classify8021d(skb, qos_map ?
 170                                               &qos_map->qos_map : NULL);
 171
 172 downgrade:
 173        return ieee80211_downgrade_queue(sdata, sta, skb);
 174}
 175
 176
 177/* Indicate which queue to use. */
 178u16 ieee80211_select_queue(struct ieee80211_sub_if_data *sdata,
 179                           struct sk_buff *skb)
 180{
 181        struct ieee80211_local *local = sdata->local;
 182        struct sta_info *sta = NULL;
 183        const u8 *ra = NULL;
 184        u16 ret;
 185
 186        /* when using iTXQ, we can do this later */
 187        if (local->ops->wake_tx_queue)
 188                return 0;
 189
 190        if (local->hw.queues < IEEE80211_NUM_ACS || skb->len < 6) {
 191                skb->priority = 0; /* required for correct WPA/11i MIC */
 192                return 0;
 193        }
 194
 195        rcu_read_lock();
 196        switch (sdata->vif.type) {
 197        case NL80211_IFTYPE_AP_VLAN:
 198                sta = rcu_dereference(sdata->u.vlan.sta);
 199                if (sta)
 200                        break;
 201                /* fall through */
 202        case NL80211_IFTYPE_AP:
 203                ra = skb->data;
 204                break;
 205        case NL80211_IFTYPE_WDS:
 206                ra = sdata->u.wds.remote_addr;
 207                break;
 208        case NL80211_IFTYPE_STATION:
 209                /* might be a TDLS station */
 210                sta = sta_info_get(sdata, skb->data);
 211                if (sta)
 212                        break;
 213
 214                ra = sdata->u.mgd.bssid;
 215                break;
 216        case NL80211_IFTYPE_ADHOC:
 217                ra = skb->data;
 218                break;
 219        default:
 220                break;
 221        }
 222
 223        if (!sta && ra && !is_multicast_ether_addr(ra))
 224                sta = sta_info_get(sdata, ra);
 225
 226        ret = __ieee80211_select_queue(sdata, sta, skb);
 227
 228        rcu_read_unlock();
 229        return ret;
 230}
 231
 232/**
 233 * ieee80211_set_qos_hdr - Fill in the QoS header if there is one.
 234 *
 235 * @sdata: local subif
 236 * @skb: packet to be updated
 237 */
 238void ieee80211_set_qos_hdr(struct ieee80211_sub_if_data *sdata,
 239                           struct sk_buff *skb)
 240{
 241        struct ieee80211_hdr *hdr = (void *)skb->data;
 242        struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
 243        u8 tid = skb->priority & IEEE80211_QOS_CTL_TAG1D_MASK;
 244        u8 flags;
 245        u8 *p;
 246
 247        if (!ieee80211_is_data_qos(hdr->frame_control))
 248                return;
 249
 250        p = ieee80211_get_qos_ctl(hdr);
 251
 252        /* set up the first byte */
 253
 254        /*
 255         * preserve everything but the TID and ACK policy
 256         * (which we both write here)
 257         */
 258        flags = *p & ~(IEEE80211_QOS_CTL_TID_MASK |
 259                       IEEE80211_QOS_CTL_ACK_POLICY_MASK);
 260
 261        if (is_multicast_ether_addr(hdr->addr1) ||
 262            sdata->noack_map & BIT(tid)) {
 263                flags |= IEEE80211_QOS_CTL_ACK_POLICY_NOACK;
 264                info->flags |= IEEE80211_TX_CTL_NO_ACK;
 265        }
 266
 267        *p = flags | tid;
 268
 269        /* set up the second byte */
 270        p++;
 271
 272        if (ieee80211_vif_is_mesh(&sdata->vif)) {
 273                /* preserve RSPI and Mesh PS Level bit */
 274                *p &= ((IEEE80211_QOS_CTL_RSPI |
 275                        IEEE80211_QOS_CTL_MESH_PS_LEVEL) >> 8);
 276
 277                /* Nulls don't have a mesh header (frame body) */
 278                if (!ieee80211_is_qos_nullfunc(hdr->frame_control))
 279                        *p |= (IEEE80211_QOS_CTL_MESH_CONTROL_PRESENT >> 8);
 280        } else {
 281                *p = 0;
 282        }
 283}
 284