[linux.git] / net / mac80211 / wme.c

// SPDX-License-Identifier: GPL-2.0-only
/*
 * Copyright 2004, Instant802 Networks, Inc.
 * Copyright 2013-2014  Intel Mobile Communications GmbH
 */

#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
d2912cb1	1	// SPDX-License-Identifier: GPL-2.0-only
f0706e82 JB	2	/*
f0706e82 JB	3	* Copyright 2004, Instant802 Networks, Inc.
d98ad83e	4	* Copyright 2013-2014 Intel Mobile Communications GmbH
f0706e82 JB	5	*/
	6
	7	#include <linux/netdevice.h>
	8	#include <linux/skbuff.h>
	9	#include <linux/module.h>
	10	#include <linux/if_arp.h>
	11	#include <linux/types.h>
	12	#include <net/ip.h>
	13	#include <net/pkt_sched.h>
	14
	15	#include <net/mac80211.h>
	16	#include "ieee80211_i.h"
	17	#include "wme.h"
	18
51cb6db0	19	/* Default mapping in classifier to work with default
e100bb64 JB	20	* queue setup.
e100bb64 JB	21	*/
4bce22b9 JB	22	const int ieee802_1d_to_ac[8] = {
	23	IEEE80211_AC_BE,
	24	IEEE80211_AC_BK,
	25	IEEE80211_AC_BK,
	26	IEEE80211_AC_BE,
	27	IEEE80211_AC_VI,
	28	IEEE80211_AC_VI,
	29	IEEE80211_AC_VO,
	30	IEEE80211_AC_VO
	31	};
f0706e82	32
51cb6db0	33	static int wme_downgrade_ac(struct sk_buff *skb)
f0706e82 JB	34	{
	35	switch (skb->priority) {
	36	case 6:
	37	case 7:
	38	skb->priority = 5; /* VO -> VI */
	39	return 0;
	40	case 4:
	41	case 5:
	42	skb->priority = 3; /* VI -> BE */
	43	return 0;
	44	case 0:
	45	case 3:
	46	skb->priority = 2; /* BE -> BK */
	47	return 0;
	48	default:
	49	return -1;
	50	}
	51	}
	52
b6da911b LK	53	/**
	54	* ieee80211_fix_reserved_tid - return the TID to use if this one is reserved
	55	* @tid: the assumed-reserved TID
	56	*
	57	* Returns: the alternative TID to use, or 0 on error
	58	*/
	59	static inline u8 ieee80211_fix_reserved_tid(u8 tid)
	60	{
	61	switch (tid) {
	62	case 0:
	63	return 3;
	64	case 1:
	65	return 2;
	66	case 2:
	67	return 1;
	68	case 3:
	69	return 0;
	70	case 4:
	71	return 5;
	72	case 5:
	73	return 4;
	74	case 6:
	75	return 7;
	76	case 7:
	77	return 6;
	78	}
	79
	80	return 0;
	81	}
	82
00e96dec	83	static u16 ieee80211_downgrade_queue(struct ieee80211_sub_if_data *sdata,
02219b3a	84	struct sta_info sta, struct sk_buff skb)
4670cf7a	85	{
02219b3a JB	86	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
02219b3a JB	87
4670cf7a	88	/* in case we are a client verify acm is not set for this ac */
02219b3a JB	89	while (sdata->wmm_acm & BIT(skb->priority)) {
	90	int ac = ieee802_1d_to_ac[skb->priority];
	91
	92	if (ifmgd->tx_tspec[ac].admitted_time &&
	93	skb->priority == ifmgd->tx_tspec[ac].up)
	94	return ac;
	95
4670cf7a JB	96	if (wme_downgrade_ac(skb)) {
	97	/*
	98	* This should not really happen. The AP has marked all
	99	* lower ACs to require admission control which is not
	100	* a reasonable configuration. Allow the frame to be
	101	* transmitted using AC_BK as a workaround.
	102	*/
	103	break;
	104	}
	105	}
	106
b6da911b LK	107	/* Check to see if this is a reserved TID */
	108	if (sta && sta->reserved_tid == skb->priority)
	109	skb->priority = ieee80211_fix_reserved_tid(skb->priority);
	110
4670cf7a JB	111	/* look up which queue to use for frames with this 1d tag */
	112	return ieee802_1d_to_ac[skb->priority];
	113	}
	114
d3c1597b	115	/* Indicate which queue to use for this fully formed 802.11 frame */
00e96dec	116	u16 ieee80211_select_queue_80211(struct ieee80211_sub_if_data *sdata,
d3c1597b TP	117	struct sk_buff *skb,
	118	struct ieee80211_hdr *hdr)
	119	{
00e96dec	120	struct ieee80211_local *local = sdata->local;
d3c1597b TP	121	u8 *p;
d3c1597b TP	122
32c5057b	123	if (local->hw.queues < IEEE80211_NUM_ACS)
d3c1597b TP	124	return 0;
	125
	126	if (!ieee80211_is_data(hdr->frame_control)) {
	127	skb->priority = 7;
	128	return ieee802_1d_to_ac[skb->priority];
	129	}
	130	if (!ieee80211_is_data_qos(hdr->frame_control)) {
	131	skb->priority = 0;
	132	return ieee802_1d_to_ac[skb->priority];
	133	}
	134
	135	p = ieee80211_get_qos_ctl(hdr);
	136	skb->priority = *p & IEEE80211_QOS_CTL_TAG1D_MASK;
	137
02219b3a	138	return ieee80211_downgrade_queue(sdata, NULL, skb);
d3c1597b	139	}
f0706e82	140
1974da8b FF	141	u16 __ieee80211_select_queue(struct ieee80211_sub_if_data *sdata,
	142	struct sta_info sta, struct sk_buff skb)
	143	{
	144	struct mac80211_qos_map *qos_map;
	145	bool qos;
	146
	147	/* all mesh/ocb stations are required to support WME */
	148	if (sdata->vif.type == NL80211_IFTYPE_MESH_POINT \|\|
	149	sdata->vif.type == NL80211_IFTYPE_OCB)
	150	qos = true;
	151	else if (sta)
	152	qos = sta->sta.wme;
	153	else
	154	qos = false;
	155
	156	if (!qos) {
	157	skb->priority = 0; /* required for correct WPA/11i MIC */
	158	return IEEE80211_AC_BE;
	159	}
	160
	161	if (skb->protocol == sdata->control_port_protocol) {
	162	skb->priority = 7;
	163	goto downgrade;
	164	}
	165
	166	/* use the data classifier to determine what 802.1d tag the
	167	* data frame has */
	168	qos_map = rcu_dereference(sdata->qos_map);
	169	skb->priority = cfg80211_classify8021d(skb, qos_map ?
	170	&qos_map->qos_map : NULL);
	171
	172	downgrade:
	173	return ieee80211_downgrade_queue(sdata, sta, skb);
	174	}
	175
	176
cf0277e7 JB	177	/* Indicate which queue to use. */
	178	u16 ieee80211_select_queue(struct ieee80211_sub_if_data *sdata,
	179	struct sk_buff *skb)
f0706e82	180	{
cf0277e7 JB	181	struct ieee80211_local *local = sdata->local;
cf0277e7 JB	182	struct sta_info *sta = NULL;
cf0277e7	183	const u8 *ra = NULL;
02219b3a	184	u16 ret;
f0706e82	185
1974da8b FF	186	/* when using iTXQ, we can do this later */
	187	if (local->ops->wake_tx_queue)
	188	return 0;
	189
32c5057b	190	if (local->hw.queues < IEEE80211_NUM_ACS \|\| skb->len < 6) {
cf0277e7	191	skb->priority = 0; /* required for correct WPA/11i MIC */
ded81f6b	192	return 0;
cf0277e7 JB	193	}
	194
	195	rcu_read_lock();
	196	switch (sdata->vif.type) {
	197	case NL80211_IFTYPE_AP_VLAN:
cf0277e7	198	sta = rcu_dereference(sdata->u.vlan.sta);
1974da8b	199	if (sta)
cf0277e7	200	break;
02049ce2	201	/* fall through */
cf0277e7 JB	202	case NL80211_IFTYPE_AP:
	203	ra = skb->data;
	204	break;
	205	case NL80211_IFTYPE_WDS:
	206	ra = sdata->u.wds.remote_addr;
	207	break;
cf0277e7	208	case NL80211_IFTYPE_STATION:
b6da911b LK	209	/* might be a TDLS station */
	210	sta = sta_info_get(sdata, skb->data);
	211	if (sta)
1974da8b	212	break;
b6da911b	213
cf0277e7 JB	214	ra = sdata->u.mgd.bssid;
	215	break;
	216	case NL80211_IFTYPE_ADHOC:
	217	ra = skb->data;
	218	break;
	219	default:
	220	break;
f0706e82 JB	221	}
f0706e82 JB	222
1974da8b	223	if (!sta && ra && !is_multicast_ether_addr(ra))
cf0277e7	224	sta = sta_info_get(sdata, ra);
cf0277e7	225
1974da8b	226	ret = __ieee80211_select_queue(sdata, sta, skb);
f0706e82	227
02219b3a JB	228	rcu_read_unlock();
02219b3a JB	229	return ret;
cf0277e7 JB	230	}
cf0277e7 JB	231
40aefedc MP	232	/**
	233	* ieee80211_set_qos_hdr - Fill in the QoS header if there is one.
	234	*
	235	* @sdata: local subif
	236	* @skb: packet to be updated
	237	*/
2154c81c JC	238	void ieee80211_set_qos_hdr(struct ieee80211_sub_if_data *sdata,
2154c81c JC	239	struct sk_buff *skb)
f0706e82	240	{
cf0277e7	241	struct ieee80211_hdr hdr = (void )skb->data;
b53be792	242	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
32910bb9 JB	243	u8 tid = skb->priority & IEEE80211_QOS_CTL_TAG1D_MASK;
32910bb9 JB	244	u8 flags;
40aefedc	245	u8 *p;
cf0277e7	246
40aefedc MP	247	if (!ieee80211_is_data_qos(hdr->frame_control))
40aefedc MP	248	return;
cf0277e7	249
40aefedc	250	p = ieee80211_get_qos_ctl(hdr);
68629c61	251
32910bb9 JB	252	/* set up the first byte */
	253
	254	/*
	255	* preserve everything but the TID and ACK policy
	256	* (which we both write here)
	257	*/
	258	flags = *p & ~(IEEE80211_QOS_CTL_TID_MASK \|
	259	IEEE80211_QOS_CTL_ACK_POLICY_MASK);
b53be792	260
40aefedc MP	261	if (is_multicast_ether_addr(hdr->addr1) \|\|
40aefedc MP	262	sdata->noack_map & BIT(tid)) {
32910bb9	263	flags \|= IEEE80211_QOS_CTL_ACK_POLICY_NOACK;
40aefedc	264	info->flags \|= IEEE80211_TX_CTL_NO_ACK;
f0706e82	265	}
40aefedc	266
32910bb9 JB	267	*p = flags \| tid;
	268
	269	/* set up the second byte */
	270	p++;
	271
3f52b7e3 MP	272	if (ieee80211_vif_is_mesh(&sdata->vif)) {
	273	/* preserve RSPI and Mesh PS Level bit */
	274	*p &= ((IEEE80211_QOS_CTL_RSPI \|
	275	IEEE80211_QOS_CTL_MESH_PS_LEVEL) >> 8);
	276
	277	/* Nulls don't have a mesh header (frame body) */
	278	if (!ieee80211_is_qos_nullfunc(hdr->frame_control))
	279	*p \|= (IEEE80211_QOS_CTL_MESH_CONTROL_PRESENT >> 8);
	280	} else {
	281	*p = 0;
	282	}
f0706e82	283	}