[linux-2.6-block.git] / net / mac80211 / wme.c

/*
 * Copyright 2004, Instant802 Networks, Inc.
 * Copyright 2013-2014  Intel Mobile Communications GmbH
 *
 * 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;
	}
}

/**
 * ieee80211_fix_reserved_tid - return the TID to use if this one is reserved
 * @tid: the assumed-reserved TID
 *
 * Returns: the alternative TID to use, or 0 on error
 */
static inline u8 ieee80211_fix_reserved_tid(u8 tid)
{
	switch (tid) {
	case 0:
		return 3;
	case 1:
		return 2;
	case 2:
		return 1;
	case 3:
		return 0;
	case 4:
		return 5;
	case 5:
		return 4;
	case 6:
		return 7;
	case 7:
		return 6;
	}

	return 0;
}

static u16 ieee80211_downgrade_queue(struct ieee80211_sub_if_data *sdata,
				     struct sta_info *sta, struct sk_buff *skb)
{
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;

	/* in case we are a client verify acm is not set for this ac */
	while (sdata->wmm_acm & BIT(skb->priority)) {
		int ac = ieee802_1d_to_ac[skb->priority];

		if (ifmgd->tx_tspec[ac].admitted_time &&
		    skb->priority == ifmgd->tx_tspec[ac].up)
			return ac;

		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;
		}
	}

	/* Check to see if this is a reserved TID */
	if (sta && sta->reserved_tid == skb->priority)
		skb->priority = ieee80211_fix_reserved_tid(skb->priority);

	/* 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, NULL, skb);
}

u16 __ieee80211_select_queue(struct ieee80211_sub_if_data *sdata,
			     struct sta_info *sta, struct sk_buff *skb)
{
	struct mac80211_qos_map *qos_map;
	bool qos;

	/* all mesh/ocb stations are required to support WME */
	if (sdata->vif.type == NL80211_IFTYPE_MESH_POINT ||
	    sdata->vif.type == NL80211_IFTYPE_OCB)
		qos = true;
	else if (sta)
		qos = sta->sta.wme;
	else
		qos = false;

	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;
		goto downgrade;
	}

	/* use the data classifier to determine what 802.1d tag the
	 * data frame has */
	qos_map = rcu_dereference(sdata->qos_map);
	skb->priority = cfg80211_classify8021d(skb, qos_map ?
					       &qos_map->qos_map : NULL);

 downgrade:
	return ieee80211_downgrade_queue(sdata, sta, 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;
	u16 ret;

	/* when using iTXQ, we can do this later */
	if (local->ops->wake_tx_queue)
		return 0;

	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)
			break;
		/* fall through */
	case NL80211_IFTYPE_AP:
		ra = skb->data;
		break;
	case NL80211_IFTYPE_WDS:
		ra = sdata->u.wds.remote_addr;
		break;
	case NL80211_IFTYPE_STATION:
		/* might be a TDLS station */
		sta = sta_info_get(sdata, skb->data);
		if (sta)
			break;

		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);

	ret = __ieee80211_select_queue(sdata, sta, skb);

	rcu_read_unlock();
	return ret;
}

/**
 * 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 tid = skb->priority & IEEE80211_QOS_CTL_TAG1D_MASK;
	u8 flags;
	u8 *p;

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

	p = ieee80211_get_qos_ctl(hdr);

	/* set up the first byte */

	/*
	 * preserve everything but the TID and ACK policy
	 * (which we both write here)
	 */
	flags = *p & ~(IEEE80211_QOS_CTL_TID_MASK |
		       IEEE80211_QOS_CTL_ACK_POLICY_MASK);

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

	*p = flags | tid;

	/* set up the second byte */
	p++;

	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	/*
f0706e82 JB	2	* Copyright 2004, Instant802 Networks, Inc.
d98ad83e	3	* Copyright 2013-2014 Intel Mobile Communications GmbH
f0706e82 JB	4	*
	5	* This program is free software; you can redistribute it and/or modify
	6	* it under the terms of the GNU General Public License version 2 as
	7	* published by the Free Software Foundation.
	8	*/
	9
	10	#include <linux/netdevice.h>
	11	#include <linux/skbuff.h>
	12	#include <linux/module.h>
	13	#include <linux/if_arp.h>
	14	#include <linux/types.h>
	15	#include <net/ip.h>
	16	#include <net/pkt_sched.h>
	17
	18	#include <net/mac80211.h>
	19	#include "ieee80211_i.h"
	20	#include "wme.h"
	21
51cb6db0	22	/* Default mapping in classifier to work with default
e100bb64 JB	23	* queue setup.
e100bb64 JB	24	*/
4bce22b9 JB	25	const int ieee802_1d_to_ac[8] = {
	26	IEEE80211_AC_BE,
	27	IEEE80211_AC_BK,
	28	IEEE80211_AC_BK,
	29	IEEE80211_AC_BE,
	30	IEEE80211_AC_VI,
	31	IEEE80211_AC_VI,
	32	IEEE80211_AC_VO,
	33	IEEE80211_AC_VO
	34	};
f0706e82	35
51cb6db0	36	static int wme_downgrade_ac(struct sk_buff *skb)
f0706e82 JB	37	{
	38	switch (skb->priority) {
	39	case 6:
	40	case 7:
	41	skb->priority = 5; /* VO -> VI */
	42	return 0;
	43	case 4:
	44	case 5:
	45	skb->priority = 3; /* VI -> BE */
	46	return 0;
	47	case 0:
	48	case 3:
	49	skb->priority = 2; /* BE -> BK */
	50	return 0;
	51	default:
	52	return -1;
	53	}
	54	}
	55
b6da911b LK	56	/**
	57	* ieee80211_fix_reserved_tid - return the TID to use if this one is reserved
	58	* @tid: the assumed-reserved TID
	59	*
	60	* Returns: the alternative TID to use, or 0 on error
	61	*/
	62	static inline u8 ieee80211_fix_reserved_tid(u8 tid)
	63	{
	64	switch (tid) {
	65	case 0:
	66	return 3;
	67	case 1:
	68	return 2;
	69	case 2:
	70	return 1;
	71	case 3:
	72	return 0;
	73	case 4:
	74	return 5;
	75	case 5:
	76	return 4;
	77	case 6:
	78	return 7;
	79	case 7:
	80	return 6;
	81	}
	82
	83	return 0;
	84	}
	85
00e96dec	86	static u16 ieee80211_downgrade_queue(struct ieee80211_sub_if_data *sdata,
02219b3a	87	struct sta_info sta, struct sk_buff skb)
4670cf7a	88	{
02219b3a JB	89	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
02219b3a JB	90
4670cf7a	91	/* in case we are a client verify acm is not set for this ac */
02219b3a JB	92	while (sdata->wmm_acm & BIT(skb->priority)) {
	93	int ac = ieee802_1d_to_ac[skb->priority];
	94
	95	if (ifmgd->tx_tspec[ac].admitted_time &&
	96	skb->priority == ifmgd->tx_tspec[ac].up)
	97	return ac;
	98
4670cf7a JB	99	if (wme_downgrade_ac(skb)) {
	100	/*
	101	* This should not really happen. The AP has marked all
	102	* lower ACs to require admission control which is not
	103	* a reasonable configuration. Allow the frame to be
	104	* transmitted using AC_BK as a workaround.
	105	*/
	106	break;
	107	}
	108	}
	109
b6da911b LK	110	/* Check to see if this is a reserved TID */
	111	if (sta && sta->reserved_tid == skb->priority)
	112	skb->priority = ieee80211_fix_reserved_tid(skb->priority);
	113
4670cf7a JB	114	/* look up which queue to use for frames with this 1d tag */
	115	return ieee802_1d_to_ac[skb->priority];
	116	}
	117
d3c1597b	118	/* Indicate which queue to use for this fully formed 802.11 frame */
00e96dec	119	u16 ieee80211_select_queue_80211(struct ieee80211_sub_if_data *sdata,
d3c1597b TP	120	struct sk_buff *skb,
	121	struct ieee80211_hdr *hdr)
	122	{
00e96dec	123	struct ieee80211_local *local = sdata->local;
d3c1597b TP	124	u8 *p;
d3c1597b TP	125
32c5057b	126	if (local->hw.queues < IEEE80211_NUM_ACS)
d3c1597b TP	127	return 0;
	128
	129	if (!ieee80211_is_data(hdr->frame_control)) {
	130	skb->priority = 7;
	131	return ieee802_1d_to_ac[skb->priority];
	132	}
	133	if (!ieee80211_is_data_qos(hdr->frame_control)) {
	134	skb->priority = 0;
	135	return ieee802_1d_to_ac[skb->priority];
	136	}
	137
	138	p = ieee80211_get_qos_ctl(hdr);
	139	skb->priority = *p & IEEE80211_QOS_CTL_TAG1D_MASK;
	140
02219b3a	141	return ieee80211_downgrade_queue(sdata, NULL, skb);
d3c1597b	142	}
f0706e82	143
1974da8b FF	144	u16 __ieee80211_select_queue(struct ieee80211_sub_if_data *sdata,
	145	struct sta_info sta, struct sk_buff skb)
	146	{
	147	struct mac80211_qos_map *qos_map;
	148	bool qos;
	149
	150	/* all mesh/ocb stations are required to support WME */
	151	if (sdata->vif.type == NL80211_IFTYPE_MESH_POINT \|\|
	152	sdata->vif.type == NL80211_IFTYPE_OCB)
	153	qos = true;
	154	else if (sta)
	155	qos = sta->sta.wme;
	156	else
	157	qos = false;
	158
	159	if (!qos) {
	160	skb->priority = 0; /* required for correct WPA/11i MIC */
	161	return IEEE80211_AC_BE;
	162	}
	163
	164	if (skb->protocol == sdata->control_port_protocol) {
	165	skb->priority = 7;
	166	goto downgrade;
	167	}
	168
	169	/* use the data classifier to determine what 802.1d tag the
	170	* data frame has */
	171	qos_map = rcu_dereference(sdata->qos_map);
	172	skb->priority = cfg80211_classify8021d(skb, qos_map ?
	173	&qos_map->qos_map : NULL);
	174
	175	downgrade:
	176	return ieee80211_downgrade_queue(sdata, sta, skb);
	177	}
	178
	179
cf0277e7 JB	180	/* Indicate which queue to use. */
	181	u16 ieee80211_select_queue(struct ieee80211_sub_if_data *sdata,
	182	struct sk_buff *skb)
f0706e82	183	{
cf0277e7 JB	184	struct ieee80211_local *local = sdata->local;
cf0277e7 JB	185	struct sta_info *sta = NULL;
cf0277e7	186	const u8 *ra = NULL;
02219b3a	187	u16 ret;
f0706e82	188
1974da8b FF	189	/* when using iTXQ, we can do this later */
	190	if (local->ops->wake_tx_queue)
	191	return 0;
	192
32c5057b	193	if (local->hw.queues < IEEE80211_NUM_ACS \|\| skb->len < 6) {
cf0277e7	194	skb->priority = 0; /* required for correct WPA/11i MIC */
ded81f6b	195	return 0;
cf0277e7 JB	196	}
	197
	198	rcu_read_lock();
	199	switch (sdata->vif.type) {
	200	case NL80211_IFTYPE_AP_VLAN:
cf0277e7	201	sta = rcu_dereference(sdata->u.vlan.sta);
1974da8b	202	if (sta)
cf0277e7	203	break;
02049ce2	204	/* fall through */
cf0277e7 JB	205	case NL80211_IFTYPE_AP:
	206	ra = skb->data;
	207	break;
	208	case NL80211_IFTYPE_WDS:
	209	ra = sdata->u.wds.remote_addr;
	210	break;
cf0277e7	211	case NL80211_IFTYPE_STATION:
b6da911b LK	212	/* might be a TDLS station */
	213	sta = sta_info_get(sdata, skb->data);
	214	if (sta)
1974da8b	215	break;
b6da911b	216
cf0277e7 JB	217	ra = sdata->u.mgd.bssid;
	218	break;
	219	case NL80211_IFTYPE_ADHOC:
	220	ra = skb->data;
	221	break;
	222	default:
	223	break;
f0706e82 JB	224	}
f0706e82 JB	225
1974da8b	226	if (!sta && ra && !is_multicast_ether_addr(ra))
cf0277e7	227	sta = sta_info_get(sdata, ra);
cf0277e7	228
1974da8b	229	ret = __ieee80211_select_queue(sdata, sta, skb);
f0706e82	230
02219b3a JB	231	rcu_read_unlock();
02219b3a JB	232	return ret;
cf0277e7 JB	233	}
cf0277e7 JB	234
40aefedc MP	235	/**
	236	* ieee80211_set_qos_hdr - Fill in the QoS header if there is one.
	237	*
	238	* @sdata: local subif
	239	* @skb: packet to be updated
	240	*/
2154c81c JC	241	void ieee80211_set_qos_hdr(struct ieee80211_sub_if_data *sdata,
2154c81c JC	242	struct sk_buff *skb)
f0706e82	243	{
cf0277e7	244	struct ieee80211_hdr hdr = (void )skb->data;
b53be792	245	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
32910bb9 JB	246	u8 tid = skb->priority & IEEE80211_QOS_CTL_TAG1D_MASK;
32910bb9 JB	247	u8 flags;
40aefedc	248	u8 *p;
cf0277e7	249
40aefedc MP	250	if (!ieee80211_is_data_qos(hdr->frame_control))
40aefedc MP	251	return;
cf0277e7	252
40aefedc	253	p = ieee80211_get_qos_ctl(hdr);
68629c61	254
32910bb9 JB	255	/* set up the first byte */
	256
	257	/*
	258	* preserve everything but the TID and ACK policy
	259	* (which we both write here)
	260	*/
	261	flags = *p & ~(IEEE80211_QOS_CTL_TID_MASK \|
	262	IEEE80211_QOS_CTL_ACK_POLICY_MASK);
b53be792	263
40aefedc MP	264	if (is_multicast_ether_addr(hdr->addr1) \|\|
40aefedc MP	265	sdata->noack_map & BIT(tid)) {
32910bb9	266	flags \|= IEEE80211_QOS_CTL_ACK_POLICY_NOACK;
40aefedc	267	info->flags \|= IEEE80211_TX_CTL_NO_ACK;
f0706e82	268	}
40aefedc	269
32910bb9 JB	270	*p = flags \| tid;
	271
	272	/* set up the second byte */
	273	p++;
	274
3f52b7e3 MP	275	if (ieee80211_vif_is_mesh(&sdata->vif)) {
	276	/* preserve RSPI and Mesh PS Level bit */
	277	*p &= ((IEEE80211_QOS_CTL_RSPI \|
	278	IEEE80211_QOS_CTL_MESH_PS_LEVEL) >> 8);
	279
	280	/* Nulls don't have a mesh header (frame body) */
	281	if (!ieee80211_is_qos_nullfunc(hdr->frame_control))
	282	*p \|= (IEEE80211_QOS_CTL_MESH_CONTROL_PRESENT >> 8);
	283	} else {
	284	*p = 0;
	285	}
f0706e82	286	}