1 // SPDX-License-Identifier: GPL-2.0-only
3 * Copyright 2004, Instant802 Networks, Inc.
4 * Copyright 2013-2014 Intel Mobile Communications GmbH
5 * Copyright (C) 2022 Intel Corporation
8 #include <linux/netdevice.h>
9 #include <linux/skbuff.h>
10 #include <linux/module.h>
11 #include <linux/if_arp.h>
12 #include <linux/types.h>
14 #include <net/pkt_sched.h>
16 #include <net/mac80211.h>
17 #include "ieee80211_i.h"
20 /* Default mapping in classifier to work with default
23 const int ieee802_1d_to_ac[8] = {
34 static int wme_downgrade_ac(struct sk_buff *skb)
36 switch (skb->priority) {
39 skb->priority = 5; /* VO -> VI */
43 skb->priority = 3; /* VI -> BE */
47 skb->priority = 2; /* BE -> BK */
55 * ieee80211_fix_reserved_tid - return the TID to use if this one is reserved
56 * @tid: the assumed-reserved TID
58 * Returns: the alternative TID to use, or 0 on error
60 static inline u8 ieee80211_fix_reserved_tid(u8 tid)
84 static u16 ieee80211_downgrade_queue(struct ieee80211_sub_if_data *sdata,
85 struct sta_info *sta, struct sk_buff *skb)
87 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
89 /* in case we are a client verify acm is not set for this ac */
90 while (sdata->wmm_acm & BIT(skb->priority)) {
91 int ac = ieee802_1d_to_ac[skb->priority];
93 if (ifmgd->tx_tspec[ac].admitted_time &&
94 skb->priority == ifmgd->tx_tspec[ac].up)
97 if (wme_downgrade_ac(skb)) {
99 * This should not really happen. The AP has marked all
100 * lower ACs to require admission control which is not
101 * a reasonable configuration. Allow the frame to be
102 * transmitted using AC_BK as a workaround.
108 /* Check to see if this is a reserved TID */
109 if (sta && sta->reserved_tid == skb->priority)
110 skb->priority = ieee80211_fix_reserved_tid(skb->priority);
112 /* look up which queue to use for frames with this 1d tag */
113 return ieee802_1d_to_ac[skb->priority];
116 /* Indicate which queue to use for this fully formed 802.11 frame */
117 u16 ieee80211_select_queue_80211(struct ieee80211_sub_if_data *sdata,
119 struct ieee80211_hdr *hdr)
121 struct ieee80211_local *local = sdata->local;
122 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
125 if ((info->control.flags & IEEE80211_TX_CTRL_DONT_REORDER) ||
126 local->hw.queues < IEEE80211_NUM_ACS)
129 if (!ieee80211_is_data(hdr->frame_control)) {
131 return ieee802_1d_to_ac[skb->priority];
133 if (!ieee80211_is_data_qos(hdr->frame_control)) {
135 return ieee802_1d_to_ac[skb->priority];
138 p = ieee80211_get_qos_ctl(hdr);
139 skb->priority = *p & IEEE80211_QOS_CTL_TAG1D_MASK;
141 return ieee80211_downgrade_queue(sdata, NULL, skb);
144 u16 __ieee80211_select_queue(struct ieee80211_sub_if_data *sdata,
145 struct sta_info *sta, struct sk_buff *skb)
147 const struct ethhdr *eth = (void *)skb->data;
148 struct mac80211_qos_map *qos_map;
151 /* all mesh/ocb stations are required to support WME */
152 if ((sdata->vif.type == NL80211_IFTYPE_MESH_POINT &&
153 !is_multicast_ether_addr(eth->h_dest)) ||
154 (sdata->vif.type == NL80211_IFTYPE_OCB && sta))
162 skb->priority = 0; /* required for correct WPA/11i MIC */
163 return IEEE80211_AC_BE;
166 if (skb->protocol == sdata->control_port_protocol) {
171 /* use the data classifier to determine what 802.1d tag the
173 qos_map = rcu_dereference(sdata->qos_map);
174 skb->priority = cfg80211_classify8021d(skb, qos_map ?
175 &qos_map->qos_map : NULL);
178 return ieee80211_downgrade_queue(sdata, sta, skb);
182 /* Indicate which queue to use. */
183 u16 ieee80211_select_queue(struct ieee80211_sub_if_data *sdata,
186 struct ieee80211_local *local = sdata->local;
187 struct sta_info *sta = NULL;
191 /* when using iTXQ, we can do this later */
192 if (local->ops->wake_tx_queue)
195 if (local->hw.queues < IEEE80211_NUM_ACS || skb->len < 6) {
196 skb->priority = 0; /* required for correct WPA/11i MIC */
201 switch (sdata->vif.type) {
202 case NL80211_IFTYPE_AP_VLAN:
203 sta = rcu_dereference(sdata->u.vlan.sta);
207 case NL80211_IFTYPE_AP:
210 case NL80211_IFTYPE_STATION:
211 /* might be a TDLS station */
212 sta = sta_info_get(sdata, skb->data);
216 ra = sdata->deflink.u.mgd.bssid;
218 case NL80211_IFTYPE_ADHOC:
225 if (!sta && ra && !is_multicast_ether_addr(ra))
226 sta = sta_info_get(sdata, ra);
228 ret = __ieee80211_select_queue(sdata, sta, skb);
235 * ieee80211_set_qos_hdr - Fill in the QoS header if there is one.
237 * @sdata: local subif
238 * @skb: packet to be updated
240 void ieee80211_set_qos_hdr(struct ieee80211_sub_if_data *sdata,
243 struct ieee80211_hdr *hdr = (void *)skb->data;
244 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
245 u8 tid = skb->priority & IEEE80211_QOS_CTL_TAG1D_MASK;
249 if (!ieee80211_is_data_qos(hdr->frame_control))
252 p = ieee80211_get_qos_ctl(hdr);
254 /* don't overwrite the QoS field of injected frames */
255 if (info->flags & IEEE80211_TX_CTL_INJECTED) {
256 /* do take into account Ack policy of injected frames */
257 if (*p & IEEE80211_QOS_CTL_ACK_POLICY_NOACK)
258 info->flags |= IEEE80211_TX_CTL_NO_ACK;
262 /* set up the first byte */
265 * preserve everything but the TID and ACK policy
266 * (which we both write here)
268 flags = *p & ~(IEEE80211_QOS_CTL_TID_MASK |
269 IEEE80211_QOS_CTL_ACK_POLICY_MASK);
271 if (is_multicast_ether_addr(hdr->addr1) ||
272 sdata->noack_map & BIT(tid)) {
273 flags |= IEEE80211_QOS_CTL_ACK_POLICY_NOACK;
274 info->flags |= IEEE80211_TX_CTL_NO_ACK;
279 /* set up the second byte */
282 if (ieee80211_vif_is_mesh(&sdata->vif)) {
283 /* preserve RSPI and Mesh PS Level bit */
284 *p &= ((IEEE80211_QOS_CTL_RSPI |
285 IEEE80211_QOS_CTL_MESH_PS_LEVEL) >> 8);
287 /* Nulls don't have a mesh header (frame body) */
288 if (!ieee80211_is_qos_nullfunc(hdr->frame_control))
289 *p |= (IEEE80211_QOS_CTL_MESH_CONTROL_PRESENT >> 8);