1/* 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 21/* Default mapping in classifier to work with default 22 * queue setup. 23 */ 24const int ieee802_1d_to_ac[8] = { 2, 3, 3, 2, 1, 1, 0, 0 }; 25 26static int wme_downgrade_ac(struct sk_buff *skb) 27{ 28 switch (skb->priority) { 29 case 6: 30 case 7: 31 skb->priority = 5; /* VO -> VI */ 32 return 0; 33 case 4: 34 case 5: 35 skb->priority = 3; /* VI -> BE */ 36 return 0; 37 case 0: 38 case 3: 39 skb->priority = 2; /* BE -> BK */ 40 return 0; 41 default: 42 return -1; 43 } 44} 45 46 47/* Indicate which queue to use. */ 48u16 ieee80211_select_queue(struct ieee80211_sub_if_data *sdata, 49 struct sk_buff *skb) 50{ 51 struct ieee80211_local *local = sdata->local; 52 struct sta_info *sta = NULL; 53 u32 sta_flags = 0; 54 const u8 *ra = NULL; 55 bool qos = false; 56 57 if (local->hw.queues < 4 || skb->len < 6) { 58 skb->priority = 0; /* required for correct WPA/11i MIC */ 59 return min_t(u16, local->hw.queues - 1, 60 ieee802_1d_to_ac[skb->priority]); 61 } 62 63 rcu_read_lock(); 64 switch (sdata->vif.type) { 65 case NL80211_IFTYPE_AP_VLAN: 66 rcu_read_lock(); 67 sta = rcu_dereference(sdata->u.vlan.sta); 68 if (sta) 69 sta_flags = get_sta_flags(sta); 70 rcu_read_unlock(); 71 if (sta) 72 break; 73 case NL80211_IFTYPE_AP: 74 ra = skb->data; 75 break; 76 case NL80211_IFTYPE_WDS: 77 ra = sdata->u.wds.remote_addr; 78 break; 79#ifdef CONFIG_MAC80211_MESH 80 case NL80211_IFTYPE_MESH_POINT: 81 break; 82#endif 83 case NL80211_IFTYPE_STATION: 84 ra = sdata->u.mgd.bssid; 85 break; 86 case NL80211_IFTYPE_ADHOC: 87 ra = skb->data; 88 break; 89 default: 90 break; 91 } 92 93 if (!sta && ra && !is_multicast_ether_addr(ra)) { 94 sta = sta_info_get(sdata, ra); 95 if (sta) 96 sta_flags = get_sta_flags(sta); 97 } 98 99 if (sta_flags & WLAN_STA_WME) 100 qos = true; 101 102 rcu_read_unlock(); 103 104 if (!qos) { 105 skb->priority = 0; /* required for correct WPA/11i MIC */ 106 return ieee802_1d_to_ac[skb->priority]; 107 } 108 109 /* use the data classifier to determine what 802.1d tag the 110 * data frame has */ 111 skb->priority = cfg80211_classify8021d(skb); 112 113 return ieee80211_downgrade_queue(local, skb); 114} 115 116u16 ieee80211_downgrade_queue(struct ieee80211_local *local, 117 struct sk_buff *skb) 118{ 119 /* in case we are a client verify acm is not set for this ac */ 120 while (unlikely(local->wmm_acm & BIT(skb->priority))) { 121 if (wme_downgrade_ac(skb)) { 122 break; 123 } 124 } 125 126 /* look up which queue to use for frames with this 1d tag */ 127 return ieee802_1d_to_ac[skb->priority]; 128} 129 130void ieee80211_set_qos_hdr(struct ieee80211_local *local, struct sk_buff *skb) 131{ 132 struct ieee80211_hdr *hdr = (void *)skb->data; 133 134 /* Fill in the QoS header if there is one. */ 135 if (ieee80211_is_data_qos(hdr->frame_control)) { 136 u8 *p = ieee80211_get_qos_ctl(hdr); 137 u8 ack_policy = 0, tid; 138 139 tid = skb->priority & IEEE80211_QOS_CTL_TAG1D_MASK; 140 141 if (unlikely(local->wifi_wme_noack_test)) 142 ack_policy |= QOS_CONTROL_ACK_POLICY_NOACK << 143 QOS_CONTROL_ACK_POLICY_SHIFT; 144 /* qos header is 2 bytes, second reserved */ 145 *p++ = ack_policy | tid; 146 *p = 0; 147 } 148} 149