[GitHub/mt8127/android_kernel_alcatel_ttab.git] / net / mac80211 / wme.c

/*
 * 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;
	}
}

static u16 ieee80211_downgrade_queue(struct ieee80211_sub_if_data *sdata,
				     struct sk_buff *skb)
{
	/* in case we are a client verify acm is not set for this ac */
	while (unlikely(sdata->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];
}

/* Indicate which queue to use for this fully formed 802.11 frame */
u16 ieee80211_select_queue_80211(struct ieee80211_sub_if_data *sdata,
				 struct sk_buff *skb,
				 struct ieee80211_hdr *hdr)
{
	struct ieee80211_local *local = sdata->local;
	u8 *p;

	if (local->hw.queues < IEEE80211_NUM_ACS)
		return 0;

	if (!ieee80211_is_data(hdr->frame_control)) {
		skb->priority = 7;
		return ieee802_1d_to_ac[skb->priority];
	}
	if (!ieee80211_is_data_qos(hdr->frame_control)) {
		skb->priority = 0;
		return ieee802_1d_to_ac[skb->priority];
	}

	p = ieee80211_get_qos_ctl(hdr);
	skb->priority = *p & IEEE80211_QOS_CTL_TAG1D_MASK;

	return ieee80211_downgrade_queue(sdata, skb);
}

/* 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 < IEEE80211_NUM_ACS || skb->len < 6) {
		skb->priority = 0; /* required for correct WPA/11i MIC */
		return 0;
	}

	rcu_read_lock();
	switch (sdata->vif.type) {
	case NL80211_IFTYPE_AP_VLAN:
		sta = rcu_dereference(sdata->u.vlan.sta);
		if (sta) {
			qos = test_sta_flag(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:
		qos = true;
		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 = test_sta_flag(sta, WLAN_STA_WME);
	}
	rcu_read_unlock();

	if (!qos) {
		skb->priority = 0; /* required for correct WPA/11i MIC */
		return IEEE80211_AC_BE;
	}

	if (skb->protocol == sdata->control_port_protocol) {
		skb->priority = 7;
		return ieee80211_downgrade_queue(sdata, skb);
	}

	/* use the data classifier to determine what 802.1d tag the
	 * data frame has */
	skb->priority = cfg80211_classify8021d(skb);

	return ieee80211_downgrade_queue(sdata, skb);
}

/**
 * ieee80211_set_qos_hdr - Fill in the QoS header if there is one.
 *
 * @sdata: local subif
 * @skb: packet to be updated
 */
void ieee80211_set_qos_hdr(struct ieee80211_sub_if_data *sdata,
			   struct sk_buff *skb)
{
	struct ieee80211_hdr *hdr = (void *)skb->data;
	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
	u8 *p;
	u8 ack_policy, tid;

	if (!ieee80211_is_data_qos(hdr->frame_control))
		return;

	p = ieee80211_get_qos_ctl(hdr);
	tid = skb->priority & IEEE80211_QOS_CTL_TAG1D_MASK;

	/* preserve EOSP bit */
	ack_policy = *p & IEEE80211_QOS_CTL_EOSP;

	if (is_multicast_ether_addr(hdr->addr1) ||
	    sdata->noack_map & BIT(tid)) {
		ack_policy |= IEEE80211_QOS_CTL_ACK_POLICY_NOACK;
		info->flags |= IEEE80211_TX_CTL_NO_ACK;
	}

	/* qos header is 2 bytes */
	*p++ = ack_policy | tid;
	if (ieee80211_vif_is_mesh(&sdata->vif)) {
		/* preserve RSPI and Mesh PS Level bit */
		*p &= ((IEEE80211_QOS_CTL_RSPI |
			IEEE80211_QOS_CTL_MESH_PS_LEVEL) >> 8);

		/* Nulls don't have a mesh header (frame body) */
		if (!ieee80211_is_qos_nullfunc(hdr->frame_control))
			*p |= (IEEE80211_QOS_CTL_MESH_CONTROL_PRESENT >> 8);
	} else {
		*p = 0;
	}
}
Commit	Line	Data
f0706e82 JB	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
51cb6db0	21	/* Default mapping in classifier to work with default
e100bb64 JB	22	* queue setup.
e100bb64 JB	23	*/
4bce22b9 JB	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	};
f0706e82	34
51cb6db0	35	static int wme_downgrade_ac(struct sk_buff *skb)
f0706e82 JB	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
00e96dec	55	static u16 ieee80211_downgrade_queue(struct ieee80211_sub_if_data *sdata,
4670cf7a JB	56	struct sk_buff *skb)
	57	{
	58	/* in case we are a client verify acm is not set for this ac */
00e96dec	59	while (unlikely(sdata->wmm_acm & BIT(skb->priority))) {
4670cf7a JB	60	if (wme_downgrade_ac(skb)) {
	61	/*
	62	* This should not really happen. The AP has marked all
	63	* lower ACs to require admission control which is not
	64	* a reasonable configuration. Allow the frame to be
	65	* transmitted using AC_BK as a workaround.
	66	*/
	67	break;
	68	}
	69	}
	70
	71	/* look up which queue to use for frames with this 1d tag */
	72	return ieee802_1d_to_ac[skb->priority];
	73	}
	74
d3c1597b	75	/* Indicate which queue to use for this fully formed 802.11 frame */
00e96dec	76	u16 ieee80211_select_queue_80211(struct ieee80211_sub_if_data *sdata,
d3c1597b TP	77	struct sk_buff *skb,
	78	struct ieee80211_hdr *hdr)
	79	{
00e96dec	80	struct ieee80211_local *local = sdata->local;
d3c1597b TP	81	u8 *p;
d3c1597b TP	82
32c5057b	83	if (local->hw.queues < IEEE80211_NUM_ACS)
d3c1597b TP	84	return 0;
	85
	86	if (!ieee80211_is_data(hdr->frame_control)) {
	87	skb->priority = 7;
	88	return ieee802_1d_to_ac[skb->priority];
	89	}
	90	if (!ieee80211_is_data_qos(hdr->frame_control)) {
	91	skb->priority = 0;
	92	return ieee802_1d_to_ac[skb->priority];
	93	}
	94
	95	p = ieee80211_get_qos_ctl(hdr);
	96	skb->priority = *p & IEEE80211_QOS_CTL_TAG1D_MASK;
	97
00e96dec	98	return ieee80211_downgrade_queue(sdata, skb);
d3c1597b	99	}
f0706e82	100
cf0277e7 JB	101	/* Indicate which queue to use. */
	102	u16 ieee80211_select_queue(struct ieee80211_sub_if_data *sdata,
	103	struct sk_buff *skb)
f0706e82	104	{
cf0277e7 JB	105	struct ieee80211_local *local = sdata->local;
cf0277e7 JB	106	struct sta_info *sta = NULL;
cf0277e7 JB	107	const u8 *ra = NULL;
cf0277e7 JB	108	bool qos = false;
f0706e82	109
32c5057b	110	if (local->hw.queues < IEEE80211_NUM_ACS \|\| skb->len < 6) {
cf0277e7	111	skb->priority = 0; /* required for correct WPA/11i MIC */
ded81f6b	112	return 0;
cf0277e7 JB	113	}
	114
	115	rcu_read_lock();
	116	switch (sdata->vif.type) {
	117	case NL80211_IFTYPE_AP_VLAN:
cf0277e7	118	sta = rcu_dereference(sdata->u.vlan.sta);
17212846	119	if (sta) {
c2c98fde	120	qos = test_sta_flag(sta, WLAN_STA_WME);
cf0277e7	121	break;
17212846	122	}
cf0277e7 JB	123	case NL80211_IFTYPE_AP:
	124	ra = skb->data;
	125	break;
	126	case NL80211_IFTYPE_WDS:
	127	ra = sdata->u.wds.remote_addr;
	128	break;
	129	#ifdef CONFIG_MAC80211_MESH
	130	case NL80211_IFTYPE_MESH_POINT:
d0ce1855	131	qos = true;
cf0277e7 JB	132	break;
	133	#endif
	134	case NL80211_IFTYPE_STATION:
	135	ra = sdata->u.mgd.bssid;
	136	break;
	137	case NL80211_IFTYPE_ADHOC:
	138	ra = skb->data;
	139	break;
	140	default:
	141	break;
f0706e82 JB	142	}
f0706e82 JB	143
cf0277e7 JB	144	if (!sta && ra && !is_multicast_ether_addr(ra)) {
	145	sta = sta_info_get(sdata, ra);
	146	if (sta)
c2c98fde	147	qos = test_sta_flag(sta, WLAN_STA_WME);
f0706e82	148	}
cf0277e7 JB	149	rcu_read_unlock();
	150
	151	if (!qos) {
f0706e82	152	skb->priority = 0; /* required for correct WPA/11i MIC */
17212846	153	return IEEE80211_AC_BE;
f0706e82 JB	154	}
f0706e82 JB	155
b59ed9d7 FF	156	if (skb->protocol == sdata->control_port_protocol) {
	157	skb->priority = 7;
	158	return ieee80211_downgrade_queue(sdata, skb);
	159	}
	160
f0706e82	161	/* use the data classifier to determine what 802.1d tag the
3c3b00ca	162	* data frame has */
e31a16d6	163	skb->priority = cfg80211_classify8021d(skb);
f0706e82	164
00e96dec	165	return ieee80211_downgrade_queue(sdata, skb);
cf0277e7 JB	166	}
cf0277e7 JB	167
40aefedc MP	168	/**
	169	* ieee80211_set_qos_hdr - Fill in the QoS header if there is one.
	170	*
	171	* @sdata: local subif
	172	* @skb: packet to be updated
	173	*/
2154c81c JC	174	void ieee80211_set_qos_hdr(struct ieee80211_sub_if_data *sdata,
2154c81c JC	175	struct sk_buff *skb)
f0706e82	176	{
cf0277e7	177	struct ieee80211_hdr hdr = (void )skb->data;
b53be792	178	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
40aefedc MP	179	u8 *p;
40aefedc MP	180	u8 ack_policy, tid;
cf0277e7	181
40aefedc MP	182	if (!ieee80211_is_data_qos(hdr->frame_control))
40aefedc MP	183	return;
cf0277e7	184
40aefedc MP	185	p = ieee80211_get_qos_ctl(hdr);
40aefedc MP	186	tid = skb->priority & IEEE80211_QOS_CTL_TAG1D_MASK;
68629c61	187
40aefedc MP	188	/* preserve EOSP bit */
40aefedc MP	189	ack_policy = *p & IEEE80211_QOS_CTL_EOSP;
b53be792	190
40aefedc MP	191	if (is_multicast_ether_addr(hdr->addr1) \|\|
	192	sdata->noack_map & BIT(tid)) {
	193	ack_policy \|= IEEE80211_QOS_CTL_ACK_POLICY_NOACK;
	194	info->flags \|= IEEE80211_TX_CTL_NO_ACK;
f0706e82	195	}
40aefedc MP	196
	197	/* qos header is 2 bytes */
	198	*p++ = ack_policy \| tid;
3f52b7e3 MP	199	if (ieee80211_vif_is_mesh(&sdata->vif)) {
	200	/* preserve RSPI and Mesh PS Level bit */
	201	*p &= ((IEEE80211_QOS_CTL_RSPI \|
	202	IEEE80211_QOS_CTL_MESH_PS_LEVEL) >> 8);
	203
	204	/* Nulls don't have a mesh header (frame body) */
	205	if (!ieee80211_is_qos_nullfunc(hdr->frame_control))
	206	*p \|= (IEEE80211_QOS_CTL_MESH_CONTROL_PRESENT >> 8);
	207	} else {
	208	*p = 0;
	209	}
f0706e82	210	}