1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * Copyright 2004, Instant802 Networks, Inc.
4 * Copyright 2013-2014 Intel Mobile Communications GmbH
5 * Copyright (C) 2022 Intel Corporation
6 */
7
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>
13 #include <net/ip.h>
14 #include <net/pkt_sched.h>
15
16 #include <net/mac80211.h>
17 #include "ieee80211_i.h"
18 #include "wme.h"
19
20 /* Default mapping in classifier to work with default
21 * queue setup.
22 */
23 const int ieee802_1d_to_ac[8] = {
24 IEEE80211_AC_BE,
25 IEEE80211_AC_BK,
26 IEEE80211_AC_BK,
27 IEEE80211_AC_BE,
28 IEEE80211_AC_VI,
29 IEEE80211_AC_VI,
30 IEEE80211_AC_VO,
31 IEEE80211_AC_VO
32 };
33
wme_downgrade_ac(struct sk_buff * skb)34 static int wme_downgrade_ac(struct sk_buff *skb)
35 {
36 switch (skb->priority) {
37 case 6:
38 case 7:
39 skb->priority = 5; /* VO -> VI */
40 return 0;
41 case 4:
42 case 5:
43 skb->priority = 3; /* VI -> BE */
44 return 0;
45 case 0:
46 case 3:
47 skb->priority = 2; /* BE -> BK */
48 return 0;
49 default:
50 return -1;
51 }
52 }
53
54 /**
55 * ieee80211_fix_reserved_tid - return the TID to use if this one is reserved
56 * @tid: the assumed-reserved TID
57 *
58 * Returns: the alternative TID to use, or 0 on error
59 */
ieee80211_fix_reserved_tid(u8 tid)60 static inline u8 ieee80211_fix_reserved_tid(u8 tid)
61 {
62 switch (tid) {
63 case 0:
64 return 3;
65 case 1:
66 return 2;
67 case 2:
68 return 1;
69 case 3:
70 return 0;
71 case 4:
72 return 5;
73 case 5:
74 return 4;
75 case 6:
76 return 7;
77 case 7:
78 return 6;
79 }
80
81 return 0;
82 }
83
ieee80211_downgrade_queue(struct ieee80211_sub_if_data * sdata,struct sta_info * sta,struct sk_buff * skb)84 static u16 ieee80211_downgrade_queue(struct ieee80211_sub_if_data *sdata,
85 struct sta_info *sta, struct sk_buff *skb)
86 {
87 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
88
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];
92
93 if (ifmgd->tx_tspec[ac].admitted_time &&
94 skb->priority == ifmgd->tx_tspec[ac].up)
95 return ac;
96
97 if (wme_downgrade_ac(skb)) {
98 /*
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.
103 */
104 break;
105 }
106 }
107
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);
111
112 /* look up which queue to use for frames with this 1d tag */
113 return ieee802_1d_to_ac[skb->priority];
114 }
115
116 /* Indicate which queue to use for this fully formed 802.11 frame */
ieee80211_select_queue_80211(struct ieee80211_sub_if_data * sdata,struct sk_buff * skb,struct ieee80211_hdr * hdr)117 u16 ieee80211_select_queue_80211(struct ieee80211_sub_if_data *sdata,
118 struct sk_buff *skb,
119 struct ieee80211_hdr *hdr)
120 {
121 struct ieee80211_local *local = sdata->local;
122 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
123 u8 *p;
124
125 if ((info->control.flags & IEEE80211_TX_CTRL_DONT_REORDER) ||
126 local->hw.queues < IEEE80211_NUM_ACS)
127 return 0;
128
129 if (!ieee80211_is_data(hdr->frame_control)) {
130 skb->priority = 7;
131 return ieee802_1d_to_ac[skb->priority];
132 }
133 if (!ieee80211_is_data_qos(hdr->frame_control)) {
134 skb->priority = 0;
135 return ieee802_1d_to_ac[skb->priority];
136 }
137
138 p = ieee80211_get_qos_ctl(hdr);
139 skb->priority = *p & IEEE80211_QOS_CTL_TAG1D_MASK;
140
141 return ieee80211_downgrade_queue(sdata, NULL, skb);
142 }
143
__ieee80211_select_queue(struct ieee80211_sub_if_data * sdata,struct sta_info * sta,struct sk_buff * skb)144 u16 __ieee80211_select_queue(struct ieee80211_sub_if_data *sdata,
145 struct sta_info *sta, struct sk_buff *skb)
146 {
147 struct mac80211_qos_map *qos_map;
148 bool qos;
149
150 /* all mesh/ocb stations are required to support WME */
151 if (sta && (sdata->vif.type == NL80211_IFTYPE_MESH_POINT ||
152 sdata->vif.type == NL80211_IFTYPE_OCB))
153 qos = true;
154 else if (sta)
155 qos = sta->sta.wme;
156 else
157 qos = false;
158
159 if (!qos) {
160 skb->priority = 0; /* required for correct WPA/11i MIC */
161 return IEEE80211_AC_BE;
162 }
163
164 if (skb->protocol == sdata->control_port_protocol) {
165 skb->priority = 7;
166 goto downgrade;
167 }
168
169 /* use the data classifier to determine what 802.1d tag the
170 * data frame has */
171 qos_map = rcu_dereference(sdata->qos_map);
172 skb->priority = cfg80211_classify8021d(skb, qos_map ?
173 &qos_map->qos_map : NULL);
174
175 downgrade:
176 return ieee80211_downgrade_queue(sdata, sta, skb);
177 }
178
179
180 /* Indicate which queue to use. */
ieee80211_select_queue(struct ieee80211_sub_if_data * sdata,struct sk_buff * skb)181 u16 ieee80211_select_queue(struct ieee80211_sub_if_data *sdata,
182 struct sk_buff *skb)
183 {
184 struct ieee80211_local *local = sdata->local;
185 struct sta_info *sta = NULL;
186 const u8 *ra = NULL;
187 u16 ret;
188
189 /* when using iTXQ, we can do this later */
190 if (local->ops->wake_tx_queue)
191 return 0;
192
193 if (local->hw.queues < IEEE80211_NUM_ACS || skb->len < 6) {
194 skb->priority = 0; /* required for correct WPA/11i MIC */
195 return 0;
196 }
197
198 rcu_read_lock();
199 switch (sdata->vif.type) {
200 case NL80211_IFTYPE_AP_VLAN:
201 sta = rcu_dereference(sdata->u.vlan.sta);
202 if (sta)
203 break;
204 fallthrough;
205 case NL80211_IFTYPE_AP:
206 ra = skb->data;
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->deflink.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 */
ieee80211_set_qos_hdr(struct ieee80211_sub_if_data * sdata,struct sk_buff * skb)238 void 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 /* don't overwrite the QoS field of injected frames */
253 if (info->flags & IEEE80211_TX_CTL_INJECTED) {
254 /* do take into account Ack policy of injected frames */
255 if (*p & IEEE80211_QOS_CTL_ACK_POLICY_NOACK)
256 info->flags |= IEEE80211_TX_CTL_NO_ACK;
257 return;
258 }
259
260 /* set up the first byte */
261
262 /*
263 * preserve everything but the TID and ACK policy
264 * (which we both write here)
265 */
266 flags = *p & ~(IEEE80211_QOS_CTL_TID_MASK |
267 IEEE80211_QOS_CTL_ACK_POLICY_MASK);
268
269 if (is_multicast_ether_addr(hdr->addr1) ||
270 sdata->noack_map & BIT(tid)) {
271 flags |= IEEE80211_QOS_CTL_ACK_POLICY_NOACK;
272 info->flags |= IEEE80211_TX_CTL_NO_ACK;
273 }
274
275 *p = flags | tid;
276
277 /* set up the second byte */
278 p++;
279
280 if (ieee80211_vif_is_mesh(&sdata->vif)) {
281 /* preserve RSPI and Mesh PS Level bit */
282 *p &= ((IEEE80211_QOS_CTL_RSPI |
283 IEEE80211_QOS_CTL_MESH_PS_LEVEL) >> 8);
284
285 /* Nulls don't have a mesh header (frame body) */
286 if (!ieee80211_is_qos_nullfunc(hdr->frame_control))
287 *p |= (IEEE80211_QOS_CTL_MESH_CONTROL_PRESENT >> 8);
288 } else {
289 *p = 0;
290 }
291 }
292