/* * 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" /* Default mapping in classifier to work with default * queue setup. */ 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 }; static int wme_downgrade_ac(struct sk_buff *skb) { 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; } } /* Indicate which queue to use. */ u16 ieee80211_select_queue(struct ieee80211_sub_if_data *sdata, struct sk_buff *skb) { struct ieee80211_local *local = sdata->local; struct sta_info *sta = NULL; const u8 *ra = NULL; bool qos = false; if (local->hw.queues < 4 || skb->len < 6) { skb->priority = 0; /* required for correct WPA/11i MIC */ return min_t(u16, local->hw.queues - 1, IEEE80211_AC_BE); } rcu_read_lock(); switch (sdata->vif.type) { case NL80211_IFTYPE_AP_VLAN: sta = rcu_dereference(sdata->u.vlan.sta); if (sta) { qos = get_sta_flags(sta) & WLAN_STA_WME; break; } 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: /* * XXX: This is clearly broken ... but already was before, * because ieee80211_fill_mesh_addresses() would clear A1 * except for multicast addresses. */ break; #endif case NL80211_IFTYPE_STATION: ra = sdata->u.mgd.bssid; break; case NL80211_IFTYPE_ADHOC: ra = skb->data; break; default: break; } if (!sta && ra && !is_multicast_ether_addr(ra)) { sta = sta_info_get(sdata, ra); if (sta) qos = get_sta_flags(sta) & WLAN_STA_WME; } rcu_read_unlock(); if (!qos) { skb->priority = 0; /* required for correct WPA/11i MIC */ return IEEE80211_AC_BE; } /* use the data classifier to determine what 802.1d tag the * data frame has */ skb->priority = cfg80211_classify8021d(skb); return ieee80211_downgrade_queue(local, skb); } u16 ieee80211_downgrade_queue(struct ieee80211_local *local, struct sk_buff *skb) { /* in case we are a client verify acm is not set for this ac */ while (unlikely(local->wmm_acm & BIT(skb->priority))) { if (wme_downgrade_ac(skb)) { /* * 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. */ break; } } /* look up which queue to use for frames with this 1d tag */ return ieee802_1d_to_ac[skb->priority]; } void ieee80211_set_qos_hdr(struct ieee80211_local *local, struct sk_buff *skb) { struct ieee80211_hdr *hdr = (void *)skb->data; /* Fill in the QoS header if there is one. */ if (ieee80211_is_data_qos(hdr->frame_control)) { u8 *p = ieee80211_get_qos_ctl(hdr); u8 ack_policy = 0, tid; tid = skb->priority & IEEE80211_QOS_CTL_TAG1D_MASK; if (unlikely(local->wifi_wme_noack_test)) ack_policy |= QOS_CONTROL_ACK_POLICY_NOACK << QOS_CONTROL_ACK_POLICY_SHIFT; /* qos header is 2 bytes, second reserved */ *p++ = ack_policy | tid; *p = 0; } }