/* * 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] = { 2, 3, 3, 2, 1, 1, 0, 0 }; 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. */ static u16 classify80211(struct ieee80211_local *local, struct sk_buff *skb) { struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; if (!ieee80211_is_data(hdr->frame_control)) { /* management frames go on AC_VO queue, but are sent * without QoS control fields */ return 0; } if (0 /* injected */) { /* use AC from radiotap */ } if (!ieee80211_is_data_qos(hdr->frame_control)) { skb->priority = 0; /* required for correct WPA/11i MIC */ return ieee802_1d_to_ac[skb->priority]; } /* use the data classifier to determine what 802.1d tag the * data frame has */ skb->priority = cfg80211_classify8021d(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_select_queue(struct ieee80211_local *local, struct sk_buff *skb) { struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; u16 queue; u8 tid; queue = classify80211(local, skb); if (unlikely(queue >= local->hw.queues)) queue = local->hw.queues - 1; /* * Now we know the 1d priority, fill in the QoS header if * there is one (and we haven't done this before). */ if (ieee80211_is_data_qos(hdr->frame_control)) { u8 *p = ieee80211_get_qos_ctl(hdr); u8 ack_policy = 0; 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; } skb_set_queue_mapping(skb, queue); }