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 */
22 const 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
wme_downgrade_ac(struct sk_buff * skb)33 static 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 */
ieee80211_fix_reserved_tid(u8 tid)59 static 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
ieee80211_downgrade_queue(struct ieee80211_sub_if_data * sdata,struct sta_info * sta,struct sk_buff * skb)83 static 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 */
ieee80211_select_queue_80211(struct ieee80211_sub_if_data * sdata,struct sk_buff * skb,struct ieee80211_hdr * hdr)116 u16 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
__ieee80211_select_queue(struct ieee80211_sub_if_data * sdata,struct sta_info * sta,struct sk_buff * skb)141 u16 __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. */
ieee80211_select_queue(struct ieee80211_sub_if_data * sdata,struct sk_buff * skb)178 u16 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 */
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 /* 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
