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