[deliverable/linux.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;
	}
}

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;
	struct mac80211_qos_map *qos_map;

	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:
		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 = sta->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 */
	rcu_read_lock();
	qos_map = rcu_dereference(sdata->qos_map);
	skb->priority = cfg80211_classify8021d(skb, qos_map ?
					       &qos_map->qos_map : NULL);
	rcu_read_unlock();

	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	/*
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
00e96dec	56	static u16 ieee80211_downgrade_queue(struct ieee80211_sub_if_data *sdata,
4670cf7a JB	57	struct sk_buff *skb)
	58	{
	59	/* in case we are a client verify acm is not set for this ac */
00e96dec	60	while (unlikely(sdata->wmm_acm & BIT(skb->priority))) {
4670cf7a JB	61	if (wme_downgrade_ac(skb)) {
	62	/*
	63	* This should not really happen. The AP has marked all
	64	* lower ACs to require admission control which is not
	65	* a reasonable configuration. Allow the frame to be
	66	* transmitted using AC_BK as a workaround.
	67	*/
	68	break;
	69	}
	70	}
	71
	72	/* look up which queue to use for frames with this 1d tag */
	73	return ieee802_1d_to_ac[skb->priority];
	74	}
	75
d3c1597b	76	/* Indicate which queue to use for this fully formed 802.11 frame */
00e96dec	77	u16 ieee80211_select_queue_80211(struct ieee80211_sub_if_data *sdata,
d3c1597b TP	78	struct sk_buff *skb,
	79	struct ieee80211_hdr *hdr)
	80	{
00e96dec	81	struct ieee80211_local *local = sdata->local;
d3c1597b TP	82	u8 *p;
d3c1597b TP	83
32c5057b	84	if (local->hw.queues < IEEE80211_NUM_ACS)
d3c1597b TP	85	return 0;
	86
	87	if (!ieee80211_is_data(hdr->frame_control)) {
	88	skb->priority = 7;
	89	return ieee802_1d_to_ac[skb->priority];
	90	}
	91	if (!ieee80211_is_data_qos(hdr->frame_control)) {
	92	skb->priority = 0;
	93	return ieee802_1d_to_ac[skb->priority];
	94	}
	95
	96	p = ieee80211_get_qos_ctl(hdr);
	97	skb->priority = *p & IEEE80211_QOS_CTL_TAG1D_MASK;
	98
00e96dec	99	return ieee80211_downgrade_queue(sdata, skb);
d3c1597b	100	}
f0706e82	101
cf0277e7 JB	102	/* Indicate which queue to use. */
	103	u16 ieee80211_select_queue(struct ieee80211_sub_if_data *sdata,
	104	struct sk_buff *skb)
f0706e82	105	{
cf0277e7 JB	106	struct ieee80211_local *local = sdata->local;
cf0277e7 JB	107	struct sta_info *sta = NULL;
cf0277e7 JB	108	const u8 *ra = NULL;
cf0277e7 JB	109	bool qos = false;
32db6b54	110	struct mac80211_qos_map *qos_map;
f0706e82	111
32c5057b	112	if (local->hw.queues < IEEE80211_NUM_ACS \|\| skb->len < 6) {
cf0277e7	113	skb->priority = 0; /* required for correct WPA/11i MIC */
ded81f6b	114	return 0;
cf0277e7 JB	115	}
	116
	117	rcu_read_lock();
	118	switch (sdata->vif.type) {
	119	case NL80211_IFTYPE_AP_VLAN:
cf0277e7	120	sta = rcu_dereference(sdata->u.vlan.sta);
17212846	121	if (sta) {
a74a8c84	122	qos = sta->sta.wme;
cf0277e7	123	break;
17212846	124	}
cf0277e7 JB	125	case NL80211_IFTYPE_AP:
	126	ra = skb->data;
	127	break;
	128	case NL80211_IFTYPE_WDS:
	129	ra = sdata->u.wds.remote_addr;
	130	break;
	131	#ifdef CONFIG_MAC80211_MESH
	132	case NL80211_IFTYPE_MESH_POINT:
d0ce1855	133	qos = true;
cf0277e7 JB	134	break;
	135	#endif
	136	case NL80211_IFTYPE_STATION:
	137	ra = sdata->u.mgd.bssid;
	138	break;
	139	case NL80211_IFTYPE_ADHOC:
	140	ra = skb->data;
	141	break;
	142	default:
	143	break;
f0706e82 JB	144	}
f0706e82 JB	145
cf0277e7 JB	146	if (!sta && ra && !is_multicast_ether_addr(ra)) {
	147	sta = sta_info_get(sdata, ra);
	148	if (sta)
a74a8c84	149	qos = sta->sta.wme;
f0706e82	150	}
cf0277e7 JB	151	rcu_read_unlock();
	152
	153	if (!qos) {
f0706e82	154	skb->priority = 0; /* required for correct WPA/11i MIC */
17212846	155	return IEEE80211_AC_BE;
f0706e82 JB	156	}
f0706e82 JB	157
1bf4bbb4 FF	158	if (skb->protocol == sdata->control_port_protocol) {
	159	skb->priority = 7;
	160	return ieee80211_downgrade_queue(sdata, skb);
	161	}
	162
f0706e82	163	/* use the data classifier to determine what 802.1d tag the
3c3b00ca	164	* data frame has */
32db6b54 KP	165	rcu_read_lock();
	166	qos_map = rcu_dereference(sdata->qos_map);
	167	skb->priority = cfg80211_classify8021d(skb, qos_map ?
	168	&qos_map->qos_map : NULL);
	169	rcu_read_unlock();
f0706e82	170
00e96dec	171	return ieee80211_downgrade_queue(sdata, skb);
cf0277e7 JB	172	}
cf0277e7 JB	173
40aefedc MP	174	/**
	175	* ieee80211_set_qos_hdr - Fill in the QoS header if there is one.
	176	*
	177	* @sdata: local subif
	178	* @skb: packet to be updated
	179	*/
2154c81c JC	180	void ieee80211_set_qos_hdr(struct ieee80211_sub_if_data *sdata,
2154c81c JC	181	struct sk_buff *skb)
f0706e82	182	{
cf0277e7	183	struct ieee80211_hdr hdr = (void )skb->data;
b53be792	184	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
40aefedc MP	185	u8 *p;
40aefedc MP	186	u8 ack_policy, tid;
cf0277e7	187
40aefedc MP	188	if (!ieee80211_is_data_qos(hdr->frame_control))
40aefedc MP	189	return;
cf0277e7	190
40aefedc MP	191	p = ieee80211_get_qos_ctl(hdr);
40aefedc MP	192	tid = skb->priority & IEEE80211_QOS_CTL_TAG1D_MASK;
68629c61	193
40aefedc MP	194	/* preserve EOSP bit */
40aefedc MP	195	ack_policy = *p & IEEE80211_QOS_CTL_EOSP;
b53be792	196
40aefedc MP	197	if (is_multicast_ether_addr(hdr->addr1) \|\|
	198	sdata->noack_map & BIT(tid)) {
	199	ack_policy \|= IEEE80211_QOS_CTL_ACK_POLICY_NOACK;
	200	info->flags \|= IEEE80211_TX_CTL_NO_ACK;
f0706e82	201	}
40aefedc MP	202
	203	/* qos header is 2 bytes */
	204	*p++ = ack_policy \| tid;
3f52b7e3 MP	205	if (ieee80211_vif_is_mesh(&sdata->vif)) {
	206	/* preserve RSPI and Mesh PS Level bit */
	207	*p &= ((IEEE80211_QOS_CTL_RSPI \|
	208	IEEE80211_QOS_CTL_MESH_PS_LEVEL) >> 8);
	209
	210	/* Nulls don't have a mesh header (frame body) */
	211	if (!ieee80211_is_qos_nullfunc(hdr->frame_control))
	212	*p \|= (IEEE80211_QOS_CTL_MESH_CONTROL_PRESENT >> 8);
	213	} else {
	214	*p = 0;
	215	}
f0706e82	216	}