1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
|
// SPDX-License-Identifier: GPL-2.0-only
/*
* Copyright 2004, Instant802 Networks, Inc.
* Copyright 2013-2014 Intel Mobile Communications GmbH
*/
#include <linux/netdevice.h>
#include <linux/skbuff.h>
#include <linux/module.h>
#include <linux/if_arp.h>
#include <linux/types.h>
#include <net/ip.h>
#include <net/pkt_sched.h>
#include <net/mac80211.h>
#include "ieee80211_i.h"
#include "wme.h"
/* Default mapping in classifier to work with default
* queue setup.
*/
const int ieee802_1d_to_ac[8] = {
IEEE80211_AC_BE,
IEEE80211_AC_BK,
IEEE80211_AC_BK,
IEEE80211_AC_BE,
IEEE80211_AC_VI,
IEEE80211_AC_VI,
IEEE80211_AC_VO,
IEEE80211_AC_VO
};
static int wme_downgrade_ac(struct sk_buff *skb)
{
switch (skb->priority) {
case 6:
case 7:
skb->priority = 5; /* VO -> VI */
return 0;
case 4:
case 5:
skb->priority = 3; /* VI -> BE */
return 0;
case 0:
case 3:
skb->priority = 2; /* BE -> BK */
return 0;
default:
return -1;
}
}
/**
* ieee80211_fix_reserved_tid - return the TID to use if this one is reserved
* @tid: the assumed-reserved TID
*
* Returns: the alternative TID to use, or 0 on error
*/
static inline u8 ieee80211_fix_reserved_tid(u8 tid)
{
switch (tid) {
case 0:
return 3;
case 1:
return 2;
case 2:
return 1;
case 3:
return 0;
case 4:
return 5;
case 5:
return 4;
case 6:
return 7;
case 7:
return 6;
}
return 0;
}
static u16 ieee80211_downgrade_queue(struct ieee80211_sub_if_data *sdata,
struct sta_info *sta, struct sk_buff *skb)
{
struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
/* in case we are a client verify acm is not set for this ac */
while (sdata->wmm_acm & BIT(skb->priority)) {
int ac = ieee802_1d_to_ac[skb->priority];
if (ifmgd->tx_tspec[ac].admitted_time &&
skb->priority == ifmgd->tx_tspec[ac].up)
return ac;
if (wme_downgrade_ac(skb)) {
/*
* This should not really happen. The AP has marked all
* lower ACs to require admission control which is not
* a reasonable configuration. Allow the frame to be
* transmitted using AC_BK as a workaround.
*/
break;
}
}
/* Check to see if this is a reserved TID */
if (sta && sta->reserved_tid == skb->priority)
skb->priority = ieee80211_fix_reserved_tid(skb->priority);
/* look up which queue to use for frames with this 1d tag */
return ieee802_1d_to_ac[skb->priority];
}
/* Indicate which queue to use for this fully formed 802.11 frame */
u16 ieee80211_select_queue_80211(struct ieee80211_sub_if_data *sdata,
struct sk_buff *skb,
struct ieee80211_hdr *hdr)
{
struct ieee80211_local *local = sdata->local;
struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
u8 *p;
if ((info->control.flags & IEEE80211_TX_CTRL_DONT_REORDER) ||
local->hw.queues < IEEE80211_NUM_ACS)
return 0;
if (!ieee80211_is_data(hdr->frame_control)) {
skb->priority = 7;
return ieee802_1d_to_ac[skb->priority];
}
if (!ieee80211_is_data_qos(hdr->frame_control)) {
skb->priority = 0;
return ieee802_1d_to_ac[skb->priority];
}
p = ieee80211_get_qos_ctl(hdr);
skb->priority = *p & IEEE80211_QOS_CTL_TAG1D_MASK;
return ieee80211_downgrade_queue(sdata, NULL, skb);
}
u16 __ieee80211_select_queue(struct ieee80211_sub_if_data *sdata,
struct sta_info *sta, struct sk_buff *skb)
{
struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
struct mac80211_qos_map *qos_map;
bool qos;
/* all mesh/ocb stations are required to support WME */
if (sdata->vif.type == NL80211_IFTYPE_MESH_POINT ||
sdata->vif.type == NL80211_IFTYPE_OCB)
qos = true;
else if (sta)
qos = sta->sta.wme;
else
qos = false;
if (!qos || (info->control.flags & IEEE80211_TX_CTRL_DONT_REORDER)) {
skb->priority = 0; /* required for correct WPA/11i MIC */
return IEEE80211_AC_BE;
}
if (skb->protocol == sdata->control_port_protocol) {
skb->priority = 7;
goto downgrade;
}
/* use the data classifier to determine what 802.1d tag the
* data frame has */
qos_map = rcu_dereference(sdata->qos_map);
skb->priority = cfg80211_classify8021d(skb, qos_map ?
&qos_map->qos_map : NULL);
downgrade:
return ieee80211_downgrade_queue(sdata, sta, skb);
}
/* Indicate which queue to use. */
u16 ieee80211_select_queue(struct ieee80211_sub_if_data *sdata,
struct sk_buff *skb)
{
struct ieee80211_local *local = sdata->local;
struct sta_info *sta = NULL;
const u8 *ra = NULL;
u16 ret;
/* when using iTXQ, we can do this later */
if (local->ops->wake_tx_queue)
return 0;
if (local->hw.queues < IEEE80211_NUM_ACS || skb->len < 6) {
skb->priority = 0; /* required for correct WPA/11i MIC */
return 0;
}
rcu_read_lock();
switch (sdata->vif.type) {
case NL80211_IFTYPE_AP_VLAN:
sta = rcu_dereference(sdata->u.vlan.sta);
if (sta)
break;
fallthrough;
case NL80211_IFTYPE_AP:
ra = skb->data;
break;
case NL80211_IFTYPE_WDS:
ra = sdata->u.wds.remote_addr;
break;
case NL80211_IFTYPE_STATION:
/* might be a TDLS station */
sta = sta_info_get(sdata, skb->data);
if (sta)
break;
ra = sdata->u.mgd.bssid;
break;
case NL80211_IFTYPE_ADHOC:
ra = skb->data;
break;
default:
break;
}
if (!sta && ra && !is_multicast_ether_addr(ra))
sta = sta_info_get(sdata, ra);
ret = __ieee80211_select_queue(sdata, sta, skb);
rcu_read_unlock();
return ret;
}
/**
* ieee80211_set_qos_hdr - Fill in the QoS header if there is one.
*
* @sdata: local subif
* @skb: packet to be updated
*/
void ieee80211_set_qos_hdr(struct ieee80211_sub_if_data *sdata,
struct sk_buff *skb)
{
struct ieee80211_hdr *hdr = (void *)skb->data;
struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
u8 tid = skb->priority & IEEE80211_QOS_CTL_TAG1D_MASK;
u8 flags;
u8 *p;
if (!ieee80211_is_data_qos(hdr->frame_control))
return;
p = ieee80211_get_qos_ctl(hdr);
/* set up the first byte */
/*
* preserve everything but the TID and ACK policy
* (which we both write here)
*/
flags = *p & ~(IEEE80211_QOS_CTL_TID_MASK |
IEEE80211_QOS_CTL_ACK_POLICY_MASK);
if (is_multicast_ether_addr(hdr->addr1) ||
sdata->noack_map & BIT(tid)) {
flags |= IEEE80211_QOS_CTL_ACK_POLICY_NOACK;
info->flags |= IEEE80211_TX_CTL_NO_ACK;
}
*p = flags | tid;
/* set up the second byte */
p++;
if (ieee80211_vif_is_mesh(&sdata->vif)) {
/* preserve RSPI and Mesh PS Level bit */
*p &= ((IEEE80211_QOS_CTL_RSPI |
IEEE80211_QOS_CTL_MESH_PS_LEVEL) >> 8);
/* Nulls don't have a mesh header (frame body) */
if (!ieee80211_is_qos_nullfunc(hdr->frame_control))
*p |= (IEEE80211_QOS_CTL_MESH_CONTROL_PRESENT >> 8);
} else {
*p = 0;
}
}
|
