[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);
}

/* 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;
	struct mac80211_qos_map *qos_map;
	u16 ret;

	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 = sta->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:
		/* might be a TDLS station */
		sta = sta_info_get(sdata, skb->data);
		if (sta)
			qos = sta->sta.wme;

		ra = sdata->u.mgd.bssid;
		break;
	case NL80211_IFTYPE_ADHOC:
		ra = skb->data;
		break;
	case NL80211_IFTYPE_OCB:
		/* all stations are required to support WME */
		qos = true;
		break;
	default:
		break;
	}

	if (!sta && ra && !is_multicast_ether_addr(ra)) {
		sta = sta_info_get(sdata, ra);
		if (sta)
			qos = sta->sta.wme;
	}

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

	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:
	ret = ieee80211_downgrade_queue(sdata, sta, skb);
 out:
	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 *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	/*
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
cf0277e7 JB	144	/* Indicate which queue to use. */
	145	u16 ieee80211_select_queue(struct ieee80211_sub_if_data *sdata,
	146	struct sk_buff *skb)
f0706e82	147	{
cf0277e7 JB	148	struct ieee80211_local *local = sdata->local;
cf0277e7 JB	149	struct sta_info *sta = NULL;
cf0277e7 JB	150	const u8 *ra = NULL;
cf0277e7 JB	151	bool qos = false;
32db6b54	152	struct mac80211_qos_map *qos_map;
02219b3a	153	u16 ret;
f0706e82	154
32c5057b	155	if (local->hw.queues < IEEE80211_NUM_ACS \|\| skb->len < 6) {
cf0277e7	156	skb->priority = 0; /* required for correct WPA/11i MIC */
ded81f6b	157	return 0;
cf0277e7 JB	158	}
	159
	160	rcu_read_lock();
	161	switch (sdata->vif.type) {
	162	case NL80211_IFTYPE_AP_VLAN:
cf0277e7	163	sta = rcu_dereference(sdata->u.vlan.sta);
17212846	164	if (sta) {
a74a8c84	165	qos = sta->sta.wme;
cf0277e7	166	break;
17212846	167	}
cf0277e7 JB	168	case NL80211_IFTYPE_AP:
	169	ra = skb->data;
	170	break;
	171	case NL80211_IFTYPE_WDS:
	172	ra = sdata->u.wds.remote_addr;
	173	break;
	174	#ifdef CONFIG_MAC80211_MESH
	175	case NL80211_IFTYPE_MESH_POINT:
d0ce1855	176	qos = true;
cf0277e7 JB	177	break;
	178	#endif
	179	case NL80211_IFTYPE_STATION:
b6da911b LK	180	/* might be a TDLS station */
	181	sta = sta_info_get(sdata, skb->data);
	182	if (sta)
	183	qos = sta->sta.wme;
	184
cf0277e7 JB	185	ra = sdata->u.mgd.bssid;
	186	break;
	187	case NL80211_IFTYPE_ADHOC:
	188	ra = skb->data;
	189	break;
239281f8 RL	190	case NL80211_IFTYPE_OCB:
	191	/* all stations are required to support WME */
	192	qos = true;
	193	break;
cf0277e7 JB	194	default:
cf0277e7 JB	195	break;
f0706e82 JB	196	}
f0706e82 JB	197
cf0277e7 JB	198	if (!sta && ra && !is_multicast_ether_addr(ra)) {
	199	sta = sta_info_get(sdata, ra);
	200	if (sta)
a74a8c84	201	qos = sta->sta.wme;
f0706e82	202	}
cf0277e7 JB	203
cf0277e7 JB	204	if (!qos) {
f0706e82	205	skb->priority = 0; /* required for correct WPA/11i MIC */
02219b3a JB	206	ret = IEEE80211_AC_BE;
02219b3a JB	207	goto out;
f0706e82 JB	208	}
f0706e82 JB	209
1bf4bbb4 FF	210	if (skb->protocol == sdata->control_port_protocol) {
1bf4bbb4 FF	211	skb->priority = 7;
02219b3a	212	goto downgrade;
1bf4bbb4 FF	213	}
1bf4bbb4 FF	214
f0706e82	215	/* use the data classifier to determine what 802.1d tag the
3c3b00ca	216	* data frame has */
32db6b54 KP	217	qos_map = rcu_dereference(sdata->qos_map);
	218	skb->priority = cfg80211_classify8021d(skb, qos_map ?
	219	&qos_map->qos_map : NULL);
f0706e82	220
02219b3a JB	221	downgrade:
	222	ret = ieee80211_downgrade_queue(sdata, sta, skb);
	223	out:
	224	rcu_read_unlock();
	225	return ret;
cf0277e7 JB	226	}
cf0277e7 JB	227
40aefedc MP	228	/**
	229	* ieee80211_set_qos_hdr - Fill in the QoS header if there is one.
	230	*
	231	* @sdata: local subif
	232	* @skb: packet to be updated
	233	*/
2154c81c JC	234	void ieee80211_set_qos_hdr(struct ieee80211_sub_if_data *sdata,
2154c81c JC	235	struct sk_buff *skb)
f0706e82	236	{
cf0277e7	237	struct ieee80211_hdr hdr = (void )skb->data;
b53be792	238	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
40aefedc MP	239	u8 *p;
40aefedc MP	240	u8 ack_policy, tid;
cf0277e7	241
40aefedc MP	242	if (!ieee80211_is_data_qos(hdr->frame_control))
40aefedc MP	243	return;
cf0277e7	244
40aefedc MP	245	p = ieee80211_get_qos_ctl(hdr);
40aefedc MP	246	tid = skb->priority & IEEE80211_QOS_CTL_TAG1D_MASK;
68629c61	247
40aefedc MP	248	/* preserve EOSP bit */
40aefedc MP	249	ack_policy = *p & IEEE80211_QOS_CTL_EOSP;
b53be792	250
40aefedc MP	251	if (is_multicast_ether_addr(hdr->addr1) \|\|
	252	sdata->noack_map & BIT(tid)) {
	253	ack_policy \|= IEEE80211_QOS_CTL_ACK_POLICY_NOACK;
	254	info->flags \|= IEEE80211_TX_CTL_NO_ACK;
f0706e82	255	}
40aefedc MP	256
	257	/* qos header is 2 bytes */
	258	*p++ = ack_policy \| tid;
3f52b7e3 MP	259	if (ieee80211_vif_is_mesh(&sdata->vif)) {
	260	/* preserve RSPI and Mesh PS Level bit */
	261	*p &= ((IEEE80211_QOS_CTL_RSPI \|
	262	IEEE80211_QOS_CTL_MESH_PS_LEVEL) >> 8);
	263
	264	/* Nulls don't have a mesh header (frame body) */
	265	if (!ieee80211_is_qos_nullfunc(hdr->frame_control))
	266	*p \|= (IEEE80211_QOS_CTL_MESH_CONTROL_PRESENT >> 8);
	267	} else {
	268	*p = 0;
	269	}
f0706e82	270	}