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net/mac80211/wme.c
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/* * Copyright 2004, Instant802 Networks, Inc. * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License version 2 as * published by the Free Software Foundation. */ #include <linux/netdevice.h> #include <linux/skbuff.h> #include <linux/module.h> #include <linux/if_arp.h> #include <linux/types.h> #include <net/ip.h> #include <net/pkt_sched.h> #include <net/mac80211.h> #include "ieee80211_i.h" #include "wme.h" |
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/* Default mapping in classifier to work with default |
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* queue setup. */ |
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const int ieee802_1d_to_ac[8] = { IEEE80211_AC_BE, IEEE80211_AC_BK, IEEE80211_AC_BK, IEEE80211_AC_BE, IEEE80211_AC_VI, IEEE80211_AC_VI, IEEE80211_AC_VO, IEEE80211_AC_VO }; |
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static int wme_downgrade_ac(struct sk_buff *skb) |
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{ switch (skb->priority) { case 6: case 7: skb->priority = 5; /* VO -> VI */ return 0; case 4: case 5: skb->priority = 3; /* VI -> BE */ return 0; case 0: case 3: skb->priority = 2; /* BE -> BK */ return 0; default: return -1; } } |
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/* Indicate which queue to use. */ u16 ieee80211_select_queue(struct ieee80211_sub_if_data *sdata, struct sk_buff *skb) |
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{ |
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struct ieee80211_local *local = sdata->local; struct sta_info *sta = NULL; |
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const u8 *ra = NULL; bool qos = false; |
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if (local->hw.queues < 4 || skb->len < 6) { skb->priority = 0; /* required for correct WPA/11i MIC */ |
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return min_t(u16, local->hw.queues - 1, IEEE80211_AC_BE); |
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} rcu_read_lock(); switch (sdata->vif.type) { case NL80211_IFTYPE_AP_VLAN: |
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sta = rcu_dereference(sdata->u.vlan.sta); |
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if (sta) { |
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qos = test_sta_flag(sta, WLAN_STA_WME); |
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break; |
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} |
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case NL80211_IFTYPE_AP: ra = skb->data; break; case NL80211_IFTYPE_WDS: ra = sdata->u.wds.remote_addr; break; #ifdef CONFIG_MAC80211_MESH case NL80211_IFTYPE_MESH_POINT: |
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ra = skb->data; |
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break; #endif case NL80211_IFTYPE_STATION: ra = sdata->u.mgd.bssid; break; case NL80211_IFTYPE_ADHOC: ra = skb->data; break; default: break; |
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} |
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if (!sta && ra && !is_multicast_ether_addr(ra)) { sta = sta_info_get(sdata, ra); if (sta) |
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qos = test_sta_flag(sta, WLAN_STA_WME); |
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} |
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rcu_read_unlock(); if (!qos) { |
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skb->priority = 0; /* required for correct WPA/11i MIC */ |
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return IEEE80211_AC_BE; |
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} /* use the data classifier to determine what 802.1d tag the |
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* data frame has */ |
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skb->priority = cfg80211_classify8021d(skb); |
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return ieee80211_downgrade_queue(local, skb); } u16 ieee80211_downgrade_queue(struct ieee80211_local *local, struct sk_buff *skb) { |
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/* in case we are a client verify acm is not set for this ac */ |
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while (unlikely(local->wmm_acm & BIT(skb->priority))) { if (wme_downgrade_ac(skb)) { |
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/* * This should not really happen. The AP has marked all * lower ACs to require admission control which is not * a reasonable configuration. Allow the frame to be * transmitted using AC_BK as a workaround. |
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*/ |
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break; |
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} } /* look up which queue to use for frames with this 1d tag */ return ieee802_1d_to_ac[skb->priority]; } |
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void ieee80211_set_qos_hdr(struct ieee80211_sub_if_data *sdata, struct sk_buff *skb) |
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{ |
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struct ieee80211_hdr *hdr = (void *)skb->data; /* Fill in the QoS header if there is one. */ |
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if (ieee80211_is_data_qos(hdr->frame_control)) { |
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u8 *p = ieee80211_get_qos_ctl(hdr); |
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u8 ack_policy = 0, tid; |
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tid = skb->priority & IEEE80211_QOS_CTL_TAG1D_MASK; |
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if (unlikely(sdata->local->wifi_wme_noack_test)) |
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ack_policy |= IEEE80211_QOS_CTL_ACK_POLICY_NOACK; |
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/* qos header is 2 bytes */ |
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*p++ = ack_policy | tid; |
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*p = ieee80211_vif_is_mesh(&sdata->vif) ? (IEEE80211_QOS_CTL_MESH_CONTROL_PRESENT >> 8) : 0; |
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} |
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} |