1 // SPDX-License-Identifier: GPL-2.0-only
3 * Copyright 2004, Instant802 Networks, Inc.
4 * Copyright 2013-2014 Intel Mobile Communications GmbH
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>
13 #include <net/pkt_sched.h>
15 #include <net/mac80211.h>
16 #include "ieee80211_i.h"
19 /* Default mapping in classifier to work with default
22 const int ieee802_1d_to_ac[8] = {
33 static int wme_downgrade_ac(struct sk_buff *skb)
35 switch (skb->priority) {
38 skb->priority = 5; /* VO -> VI */
42 skb->priority = 3; /* VI -> BE */
46 skb->priority = 2; /* BE -> BK */
54 * ieee80211_fix_reserved_tid - return the TID to use if this one is reserved
55 * @tid: the assumed-reserved TID
57 * Returns: the alternative TID to use, or 0 on error
59 static inline u8 ieee80211_fix_reserved_tid(u8 tid)
83 static u16 ieee80211_downgrade_queue(struct ieee80211_sub_if_data *sdata,
84 struct sta_info *sta, struct sk_buff *skb)
86 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
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];
92 if (ifmgd->tx_tspec[ac].admitted_time &&
93 skb->priority == ifmgd->tx_tspec[ac].up)
96 if (wme_downgrade_ac(skb)) {
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.
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);
111 /* look up which queue to use for frames with this 1d tag */
112 return ieee802_1d_to_ac[skb->priority];
115 /* Indicate which queue to use for this fully formed 802.11 frame */
116 u16 ieee80211_select_queue_80211(struct ieee80211_sub_if_data *sdata,
118 struct ieee80211_hdr *hdr)
120 struct ieee80211_local *local = sdata->local;
121 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
124 if ((info->control.flags & IEEE80211_TX_CTRL_DONT_REORDER) ||
125 local->hw.queues < IEEE80211_NUM_ACS)
128 if (!ieee80211_is_data(hdr->frame_control)) {
130 return ieee802_1d_to_ac[skb->priority];
132 if (!ieee80211_is_data_qos(hdr->frame_control)) {
134 return ieee802_1d_to_ac[skb->priority];
137 p = ieee80211_get_qos_ctl(hdr);
138 skb->priority = *p & IEEE80211_QOS_CTL_TAG1D_MASK;
140 return ieee80211_downgrade_queue(sdata, NULL, skb);
143 u16 __ieee80211_select_queue(struct ieee80211_sub_if_data *sdata,
144 struct sta_info *sta, struct sk_buff *skb)
146 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
147 struct mac80211_qos_map *qos_map;
150 /* all mesh/ocb stations are required to support WME */
151 if (sdata->vif.type == NL80211_IFTYPE_MESH_POINT ||
152 sdata->vif.type == NL80211_IFTYPE_OCB)
159 if (!qos || (info->control.flags & IEEE80211_TX_CTRL_DONT_REORDER)) {
160 skb->priority = 0; /* required for correct WPA/11i MIC */
161 return IEEE80211_AC_BE;
164 if (skb->protocol == sdata->control_port_protocol) {
169 /* use the data classifier to determine what 802.1d tag the
171 qos_map = rcu_dereference(sdata->qos_map);
172 skb->priority = cfg80211_classify8021d(skb, qos_map ?
173 &qos_map->qos_map : NULL);
176 return ieee80211_downgrade_queue(sdata, sta, skb);
180 /* Indicate which queue to use. */
181 u16 ieee80211_select_queue(struct ieee80211_sub_if_data *sdata,
184 struct ieee80211_local *local = sdata->local;
185 struct sta_info *sta = NULL;
189 /* when using iTXQ, we can do this later */
190 if (local->ops->wake_tx_queue)
193 if (local->hw.queues < IEEE80211_NUM_ACS || skb->len < 6) {
194 skb->priority = 0; /* required for correct WPA/11i MIC */
199 switch (sdata->vif.type) {
200 case NL80211_IFTYPE_AP_VLAN:
201 sta = rcu_dereference(sdata->u.vlan.sta);
205 case NL80211_IFTYPE_AP:
208 case NL80211_IFTYPE_WDS:
209 ra = sdata->u.wds.remote_addr;
211 case NL80211_IFTYPE_STATION:
212 /* might be a TDLS station */
213 sta = sta_info_get(sdata, skb->data);
217 ra = sdata->u.mgd.bssid;
219 case NL80211_IFTYPE_ADHOC:
226 if (!sta && ra && !is_multicast_ether_addr(ra))
227 sta = sta_info_get(sdata, ra);
229 ret = __ieee80211_select_queue(sdata, sta, skb);
236 * ieee80211_set_qos_hdr - Fill in the QoS header if there is one.
238 * @sdata: local subif
239 * @skb: packet to be updated
241 void ieee80211_set_qos_hdr(struct ieee80211_sub_if_data *sdata,
244 struct ieee80211_hdr *hdr = (void *)skb->data;
245 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
246 u8 tid = skb->priority & IEEE80211_QOS_CTL_TAG1D_MASK;
250 if (!ieee80211_is_data_qos(hdr->frame_control))
253 p = ieee80211_get_qos_ctl(hdr);
255 /* set up the first byte */
258 * preserve everything but the TID and ACK policy
259 * (which we both write here)
261 flags = *p & ~(IEEE80211_QOS_CTL_TID_MASK |
262 IEEE80211_QOS_CTL_ACK_POLICY_MASK);
264 if (is_multicast_ether_addr(hdr->addr1) ||
265 sdata->noack_map & BIT(tid)) {
266 flags |= IEEE80211_QOS_CTL_ACK_POLICY_NOACK;
267 info->flags |= IEEE80211_TX_CTL_NO_ACK;
272 /* set up the second byte */
275 if (ieee80211_vif_is_mesh(&sdata->vif)) {
276 /* preserve RSPI and Mesh PS Level bit */
277 *p &= ((IEEE80211_QOS_CTL_RSPI |
278 IEEE80211_QOS_CTL_MESH_PS_LEVEL) >> 8);
280 /* Nulls don't have a mesh header (frame body) */
281 if (!ieee80211_is_qos_nullfunc(hdr->frame_control))
282 *p |= (IEEE80211_QOS_CTL_MESH_CONTROL_PRESENT >> 8);