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Jiri Bencf0706e82007-05-05 11:45:53 -07001/*
2 * Copyright 2004, Instant802 Networks, Inc.
3 *
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License version 2 as
6 * published by the Free Software Foundation.
7 */
8
9#include <linux/netdevice.h>
10#include <linux/skbuff.h>
11#include <linux/module.h>
12#include <linux/if_arp.h>
13#include <linux/types.h>
14#include <net/ip.h>
15#include <net/pkt_sched.h>
16
17#include <net/mac80211.h>
18#include "ieee80211_i.h"
19#include "wme.h"
20
David S. Miller51cb6db2008-07-15 03:34:57 -070021/* Default mapping in classifier to work with default
Johannes Berge100bb62008-04-30 18:51:21 +020022 * queue setup.
23 */
Johannes Berg4bce22b2010-11-16 11:49:58 -080024const int ieee802_1d_to_ac[8] = {
25 IEEE80211_AC_BE,
26 IEEE80211_AC_BK,
27 IEEE80211_AC_BK,
28 IEEE80211_AC_BE,
29 IEEE80211_AC_VI,
30 IEEE80211_AC_VI,
31 IEEE80211_AC_VO,
32 IEEE80211_AC_VO
33};
Jiri Bencf0706e82007-05-05 11:45:53 -070034
David S. Miller51cb6db2008-07-15 03:34:57 -070035static int wme_downgrade_ac(struct sk_buff *skb)
Jiri Bencf0706e82007-05-05 11:45:53 -070036{
37 switch (skb->priority) {
38 case 6:
39 case 7:
40 skb->priority = 5; /* VO -> VI */
41 return 0;
42 case 4:
43 case 5:
44 skb->priority = 3; /* VI -> BE */
45 return 0;
46 case 0:
47 case 3:
48 skb->priority = 2; /* BE -> BK */
49 return 0;
50 default:
51 return -1;
52 }
53}
54
Yoni Divinsky00e96de2012-06-20 15:39:13 +030055static u16 ieee80211_downgrade_queue(struct ieee80211_sub_if_data *sdata,
Johannes Berg4670cf72012-03-27 14:18:38 +020056 struct sk_buff *skb)
57{
58 /* in case we are a client verify acm is not set for this ac */
Yoni Divinsky00e96de2012-06-20 15:39:13 +030059 while (unlikely(sdata->wmm_acm & BIT(skb->priority))) {
Johannes Berg4670cf72012-03-27 14:18:38 +020060 if (wme_downgrade_ac(skb)) {
61 /*
62 * This should not really happen. The AP has marked all
63 * lower ACs to require admission control which is not
64 * a reasonable configuration. Allow the frame to be
65 * transmitted using AC_BK as a workaround.
66 */
67 break;
68 }
69 }
70
71 /* look up which queue to use for frames with this 1d tag */
72 return ieee802_1d_to_ac[skb->priority];
73}
74
Thomas Pedersend3c15972011-11-24 17:15:23 -080075/* Indicate which queue to use for this fully formed 802.11 frame */
Yoni Divinsky00e96de2012-06-20 15:39:13 +030076u16 ieee80211_select_queue_80211(struct ieee80211_sub_if_data *sdata,
Thomas Pedersend3c15972011-11-24 17:15:23 -080077 struct sk_buff *skb,
78 struct ieee80211_hdr *hdr)
79{
Yoni Divinsky00e96de2012-06-20 15:39:13 +030080 struct ieee80211_local *local = sdata->local;
Thomas Pedersend3c15972011-11-24 17:15:23 -080081 u8 *p;
82
Johannes Berg32c50572012-03-28 11:04:29 +020083 if (local->hw.queues < IEEE80211_NUM_ACS)
Thomas Pedersend3c15972011-11-24 17:15:23 -080084 return 0;
85
86 if (!ieee80211_is_data(hdr->frame_control)) {
87 skb->priority = 7;
88 return ieee802_1d_to_ac[skb->priority];
89 }
90 if (!ieee80211_is_data_qos(hdr->frame_control)) {
91 skb->priority = 0;
92 return ieee802_1d_to_ac[skb->priority];
93 }
94
95 p = ieee80211_get_qos_ctl(hdr);
96 skb->priority = *p & IEEE80211_QOS_CTL_TAG1D_MASK;
97
Yoni Divinsky00e96de2012-06-20 15:39:13 +030098 return ieee80211_downgrade_queue(sdata, skb);
Thomas Pedersend3c15972011-11-24 17:15:23 -080099}
Jiri Bencf0706e82007-05-05 11:45:53 -0700100
Johannes Bergcf0277e2010-01-05 18:00:58 +0100101/* Indicate which queue to use. */
102u16 ieee80211_select_queue(struct ieee80211_sub_if_data *sdata,
103 struct sk_buff *skb)
Jiri Bencf0706e82007-05-05 11:45:53 -0700104{
Johannes Bergcf0277e2010-01-05 18:00:58 +0100105 struct ieee80211_local *local = sdata->local;
106 struct sta_info *sta = NULL;
Johannes Bergcf0277e2010-01-05 18:00:58 +0100107 const u8 *ra = NULL;
108 bool qos = false;
Jiri Bencf0706e82007-05-05 11:45:53 -0700109
Johannes Berg32c50572012-03-28 11:04:29 +0200110 if (local->hw.queues < IEEE80211_NUM_ACS || skb->len < 6) {
Johannes Bergcf0277e2010-01-05 18:00:58 +0100111 skb->priority = 0; /* required for correct WPA/11i MIC */
Johannes Bergded81f62012-03-28 11:04:26 +0200112 return 0;
Jiri Bencf0706e82007-05-05 11:45:53 -0700113 }
114
Johannes Bergcf0277e2010-01-05 18:00:58 +0100115 rcu_read_lock();
116 switch (sdata->vif.type) {
117 case NL80211_IFTYPE_AP_VLAN:
Johannes Bergcf0277e2010-01-05 18:00:58 +0100118 sta = rcu_dereference(sdata->u.vlan.sta);
Johannes Berg17212842010-12-22 10:15:30 +0100119 if (sta) {
Johannes Bergc2c98fd2011-09-29 16:04:36 +0200120 qos = test_sta_flag(sta, WLAN_STA_WME);
Johannes Bergcf0277e2010-01-05 18:00:58 +0100121 break;
Johannes Berg17212842010-12-22 10:15:30 +0100122 }
Johannes Bergcf0277e2010-01-05 18:00:58 +0100123 case NL80211_IFTYPE_AP:
124 ra = skb->data;
125 break;
126 case NL80211_IFTYPE_WDS:
127 ra = sdata->u.wds.remote_addr;
128 break;
129#ifdef CONFIG_MAC80211_MESH
130 case NL80211_IFTYPE_MESH_POINT:
Javier Cardonad0ce1852011-11-03 21:11:13 -0700131 qos = true;
Johannes Bergcf0277e2010-01-05 18:00:58 +0100132 break;
133#endif
134 case NL80211_IFTYPE_STATION:
135 ra = sdata->u.mgd.bssid;
136 break;
137 case NL80211_IFTYPE_ADHOC:
138 ra = skb->data;
139 break;
140 default:
141 break;
Jiri Bencf0706e82007-05-05 11:45:53 -0700142 }
143
Johannes Bergcf0277e2010-01-05 18:00:58 +0100144 if (!sta && ra && !is_multicast_ether_addr(ra)) {
145 sta = sta_info_get(sdata, ra);
146 if (sta)
Johannes Bergc2c98fd2011-09-29 16:04:36 +0200147 qos = test_sta_flag(sta, WLAN_STA_WME);
Johannes Bergcf0277e2010-01-05 18:00:58 +0100148 }
Johannes Bergcf0277e2010-01-05 18:00:58 +0100149 rcu_read_unlock();
150
151 if (!qos) {
Jiri Bencf0706e82007-05-05 11:45:53 -0700152 skb->priority = 0; /* required for correct WPA/11i MIC */
Johannes Berg17212842010-12-22 10:15:30 +0100153 return IEEE80211_AC_BE;
Jiri Bencf0706e82007-05-05 11:45:53 -0700154 }
155
156 /* use the data classifier to determine what 802.1d tag the
Johannes Berg3c3b00c2007-08-28 17:01:55 -0400157 * data frame has */
Zhu Yie31a16d2009-05-21 21:47:03 +0800158 skb->priority = cfg80211_classify8021d(skb);
Jiri Bencf0706e82007-05-05 11:45:53 -0700159
Yoni Divinsky00e96de2012-06-20 15:39:13 +0300160 return ieee80211_downgrade_queue(sdata, skb);
Johannes Bergcf0277e2010-01-05 18:00:58 +0100161}
162
Marco Porsch40aefed2012-11-21 18:40:31 -0800163/**
164 * ieee80211_set_qos_hdr - Fill in the QoS header if there is one.
165 *
166 * @sdata: local subif
167 * @skb: packet to be updated
168 */
Javier Cardona2154c812011-09-07 17:49:53 -0700169void ieee80211_set_qos_hdr(struct ieee80211_sub_if_data *sdata,
170 struct sk_buff *skb)
Jiri Bencf0706e82007-05-05 11:45:53 -0700171{
Johannes Bergcf0277e2010-01-05 18:00:58 +0100172 struct ieee80211_hdr *hdr = (void *)skb->data;
Simon Wunderlichb53be792011-11-18 14:20:44 +0100173 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
Marco Porsch40aefed2012-11-21 18:40:31 -0800174 u8 *p;
175 u8 ack_policy, tid;
Jiri Bencf0706e82007-05-05 11:45:53 -0700176
Marco Porsch40aefed2012-11-21 18:40:31 -0800177 if (!ieee80211_is_data_qos(hdr->frame_control))
178 return;
Johannes Bergcf0277e2010-01-05 18:00:58 +0100179
Marco Porsch40aefed2012-11-21 18:40:31 -0800180 p = ieee80211_get_qos_ctl(hdr);
181 tid = skb->priority & IEEE80211_QOS_CTL_TAG1D_MASK;
Johannes Bergcf0277e2010-01-05 18:00:58 +0100182
Marco Porsch40aefed2012-11-21 18:40:31 -0800183 /* preserve EOSP bit */
184 ack_policy = *p & IEEE80211_QOS_CTL_EOSP;
Johannes Berg68629c612011-11-03 09:59:39 +0100185
Marco Porsch40aefed2012-11-21 18:40:31 -0800186 if (is_multicast_ether_addr(hdr->addr1) ||
187 sdata->noack_map & BIT(tid)) {
188 ack_policy |= IEEE80211_QOS_CTL_ACK_POLICY_NOACK;
189 info->flags |= IEEE80211_TX_CTL_NO_ACK;
Jiri Bencf0706e82007-05-05 11:45:53 -0700190 }
Marco Porsch40aefed2012-11-21 18:40:31 -0800191
192 /* qos header is 2 bytes */
193 *p++ = ack_policy | tid;
Marco Porsch3f52b7e2013-01-30 18:14:08 +0100194 if (ieee80211_vif_is_mesh(&sdata->vif)) {
195 /* preserve RSPI and Mesh PS Level bit */
196 *p &= ((IEEE80211_QOS_CTL_RSPI |
197 IEEE80211_QOS_CTL_MESH_PS_LEVEL) >> 8);
198
199 /* Nulls don't have a mesh header (frame body) */
200 if (!ieee80211_is_qos_nullfunc(hdr->frame_control))
201 *p |= (IEEE80211_QOS_CTL_MESH_CONTROL_PRESENT >> 8);
202 } else {
203 *p = 0;
204 }
Jiri Bencf0706e82007-05-05 11:45:53 -0700205}