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 /* Indicate which queue to use for this fully formed 802.11 frame */ 56 u16 ieee80211_select_queue_80211(struct ieee80211_local *local, 57 struct sk_buff *skb, 58 struct ieee80211_hdr *hdr) 59 { 60 u8 *p; 61 62 if (local->hw.queues < 4) 63 return 0; 64 65 if (!ieee80211_is_data(hdr->frame_control)) { 66 skb->priority = 7; 67 return ieee802_1d_to_ac[skb->priority]; 68 } 69 if (!ieee80211_is_data_qos(hdr->frame_control)) { 70 skb->priority = 0; 71 return ieee802_1d_to_ac[skb->priority]; 72 } 73 74 p = ieee80211_get_qos_ctl(hdr); 75 skb->priority = *p & IEEE80211_QOS_CTL_TAG1D_MASK; 76 77 return ieee80211_downgrade_queue(local, skb); 78 } 79 80 /* Indicate which queue to use. */ 81 u16 ieee80211_select_queue(struct ieee80211_sub_if_data *sdata, 82 struct sk_buff *skb) 83 { 84 struct ieee80211_local *local = sdata->local; 85 struct sta_info *sta = NULL; 86 const u8 *ra = NULL; 87 bool qos = false; 88 89 if (local->hw.queues < 4 || skb->len < 6) { 90 skb->priority = 0; /* required for correct WPA/11i MIC */ 91 return min_t(u16, local->hw.queues - 1, IEEE80211_AC_BE); 92 } 93 94 rcu_read_lock(); 95 switch (sdata->vif.type) { 96 case NL80211_IFTYPE_AP_VLAN: 97 sta = rcu_dereference(sdata->u.vlan.sta); 98 if (sta) { 99 qos = test_sta_flag(sta, WLAN_STA_WME); 100 break; 101 } 102 case NL80211_IFTYPE_AP: 103 ra = skb->data; 104 break; 105 case NL80211_IFTYPE_WDS: 106 ra = sdata->u.wds.remote_addr; 107 break; 108 #ifdef CONFIG_MAC80211_MESH 109 case NL80211_IFTYPE_MESH_POINT: 110 qos = true; 111 break; 112 #endif 113 case NL80211_IFTYPE_STATION: 114 ra = sdata->u.mgd.bssid; 115 break; 116 case NL80211_IFTYPE_ADHOC: 117 ra = skb->data; 118 break; 119 default: 120 break; 121 } 122 123 if (!sta && ra && !is_multicast_ether_addr(ra)) { 124 sta = sta_info_get(sdata, ra); 125 if (sta) 126 qos = test_sta_flag(sta, WLAN_STA_WME); 127 } 128 rcu_read_unlock(); 129 130 if (!qos) { 131 skb->priority = 0; /* required for correct WPA/11i MIC */ 132 return IEEE80211_AC_BE; 133 } 134 135 /* use the data classifier to determine what 802.1d tag the 136 * data frame has */ 137 skb->priority = cfg80211_classify8021d(skb); 138 139 return ieee80211_downgrade_queue(local, skb); 140 } 141 142 u16 ieee80211_downgrade_queue(struct ieee80211_local *local, 143 struct sk_buff *skb) 144 { 145 /* in case we are a client verify acm is not set for this ac */ 146 while (unlikely(local->wmm_acm & BIT(skb->priority))) { 147 if (wme_downgrade_ac(skb)) { 148 /* 149 * This should not really happen. The AP has marked all 150 * lower ACs to require admission control which is not 151 * a reasonable configuration. Allow the frame to be 152 * transmitted using AC_BK as a workaround. 153 */ 154 break; 155 } 156 } 157 158 /* look up which queue to use for frames with this 1d tag */ 159 return ieee802_1d_to_ac[skb->priority]; 160 } 161 162 void ieee80211_set_qos_hdr(struct ieee80211_sub_if_data *sdata, 163 struct sk_buff *skb) 164 { 165 struct ieee80211_hdr *hdr = (void *)skb->data; 166 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 167 168 /* Fill in the QoS header if there is one. */ 169 if (ieee80211_is_data_qos(hdr->frame_control)) { 170 u8 *p = ieee80211_get_qos_ctl(hdr); 171 u8 ack_policy, tid; 172 173 tid = skb->priority & IEEE80211_QOS_CTL_TAG1D_MASK; 174 175 /* preserve EOSP bit */ 176 ack_policy = *p & IEEE80211_QOS_CTL_EOSP; 177 178 if (is_multicast_ether_addr(hdr->addr1) || 179 sdata->noack_map & BIT(tid)) { 180 ack_policy |= IEEE80211_QOS_CTL_ACK_POLICY_NOACK; 181 info->flags |= IEEE80211_TX_CTL_NO_ACK; 182 } 183 184 /* qos header is 2 bytes */ 185 *p++ = ack_policy | tid; 186 *p = ieee80211_vif_is_mesh(&sdata->vif) ? 187 (IEEE80211_QOS_CTL_MESH_CONTROL_PRESENT >> 8) : 0; 188 } 189 } 190