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 */ 24 const 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 }; 34 35 static int wme_downgrade_ac(struct sk_buff *skb) 36 { 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 55 static u16 ieee80211_downgrade_queue(struct ieee80211_sub_if_data *sdata, 56 struct sk_buff *skb) 57 { 58 /* in case we are a client verify acm is not set for this ac */ 59 while (unlikely(sdata->wmm_acm & BIT(skb->priority))) { 60 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 75 /* Indicate which queue to use for this fully formed 802.11 frame */ 76 u16 ieee80211_select_queue_80211(struct ieee80211_sub_if_data *sdata, 77 struct sk_buff *skb, 78 struct ieee80211_hdr *hdr) 79 { 80 struct ieee80211_local *local = sdata->local; 81 u8 *p; 82 83 if (local->hw.queues < IEEE80211_NUM_ACS) 84 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 98 return ieee80211_downgrade_queue(sdata, skb); 99 } 100 101 /* Indicate which queue to use. */ 102 u16 ieee80211_select_queue(struct ieee80211_sub_if_data *sdata, 103 struct sk_buff *skb) 104 { 105 struct ieee80211_local *local = sdata->local; 106 struct sta_info *sta = NULL; 107 const u8 *ra = NULL; 108 bool qos = false; 109 110 if (local->hw.queues < IEEE80211_NUM_ACS || skb->len < 6) { 111 skb->priority = 0; /* required for correct WPA/11i MIC */ 112 return 0; 113 } 114 115 rcu_read_lock(); 116 switch (sdata->vif.type) { 117 case NL80211_IFTYPE_AP_VLAN: 118 sta = rcu_dereference(sdata->u.vlan.sta); 119 if (sta) { 120 qos = test_sta_flag(sta, WLAN_STA_WME); 121 break; 122 } 123 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: 131 qos = true; 132 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; 142 } 143 144 if (!sta && ra && !is_multicast_ether_addr(ra)) { 145 sta = sta_info_get(sdata, ra); 146 if (sta) 147 qos = test_sta_flag(sta, WLAN_STA_WME); 148 } 149 rcu_read_unlock(); 150 151 if (!qos) { 152 skb->priority = 0; /* required for correct WPA/11i MIC */ 153 return IEEE80211_AC_BE; 154 } 155 156 /* use the data classifier to determine what 802.1d tag the 157 * data frame has */ 158 skb->priority = cfg80211_classify8021d(skb); 159 160 return ieee80211_downgrade_queue(sdata, skb); 161 } 162 163 /** 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 */ 169 void ieee80211_set_qos_hdr(struct ieee80211_sub_if_data *sdata, 170 struct sk_buff *skb) 171 { 172 struct ieee80211_hdr *hdr = (void *)skb->data; 173 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 174 u8 *p; 175 u8 ack_policy, tid; 176 177 if (!ieee80211_is_data_qos(hdr->frame_control)) 178 return; 179 180 p = ieee80211_get_qos_ctl(hdr); 181 tid = skb->priority & IEEE80211_QOS_CTL_TAG1D_MASK; 182 183 /* preserve EOSP bit */ 184 ack_policy = *p & IEEE80211_QOS_CTL_EOSP; 185 186 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; 190 } 191 192 /* qos header is 2 bytes */ 193 *p++ = ack_policy | tid; 194 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 } 205 } 206