6693be7124
Take a __le16 directly rather than a host-endian value. Signed-off-by: Harvey Harrison <harvey.harrison@gmail.com> Signed-off-by: John W. Linville <linville@tuxdriver.com>
479 lines
12 KiB
C
479 lines
12 KiB
C
/*
|
|
* Copyright 2002-2005, Instant802 Networks, Inc.
|
|
* Copyright 2005-2006, Devicescape Software, Inc.
|
|
* Copyright 2006-2007 Jiri Benc <jbenc@suse.cz>
|
|
* Copyright 2007 Johannes Berg <johannes@sipsolutions.net>
|
|
*
|
|
* 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.
|
|
*
|
|
* utilities for mac80211
|
|
*/
|
|
|
|
#include <net/mac80211.h>
|
|
#include <linux/netdevice.h>
|
|
#include <linux/types.h>
|
|
#include <linux/slab.h>
|
|
#include <linux/skbuff.h>
|
|
#include <linux/etherdevice.h>
|
|
#include <linux/if_arp.h>
|
|
#include <linux/wireless.h>
|
|
#include <linux/bitmap.h>
|
|
#include <net/net_namespace.h>
|
|
#include <net/cfg80211.h>
|
|
#include <net/rtnetlink.h>
|
|
|
|
#include "ieee80211_i.h"
|
|
#include "rate.h"
|
|
#include "mesh.h"
|
|
#include "wme.h"
|
|
|
|
/* privid for wiphys to determine whether they belong to us or not */
|
|
void *mac80211_wiphy_privid = &mac80211_wiphy_privid;
|
|
|
|
/* See IEEE 802.1H for LLC/SNAP encapsulation/decapsulation */
|
|
/* Ethernet-II snap header (RFC1042 for most EtherTypes) */
|
|
const unsigned char rfc1042_header[] __aligned(2) =
|
|
{ 0xaa, 0xaa, 0x03, 0x00, 0x00, 0x00 };
|
|
|
|
/* Bridge-Tunnel header (for EtherTypes ETH_P_AARP and ETH_P_IPX) */
|
|
const unsigned char bridge_tunnel_header[] __aligned(2) =
|
|
{ 0xaa, 0xaa, 0x03, 0x00, 0x00, 0xf8 };
|
|
|
|
|
|
u8 *ieee80211_get_bssid(struct ieee80211_hdr *hdr, size_t len,
|
|
enum ieee80211_if_types type)
|
|
{
|
|
u16 fc;
|
|
|
|
/* drop ACK/CTS frames and incorrect hdr len (ctrl) */
|
|
if (len < 16)
|
|
return NULL;
|
|
|
|
fc = le16_to_cpu(hdr->frame_control);
|
|
|
|
switch (fc & IEEE80211_FCTL_FTYPE) {
|
|
case IEEE80211_FTYPE_DATA:
|
|
if (len < 24) /* drop incorrect hdr len (data) */
|
|
return NULL;
|
|
switch (fc & (IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS)) {
|
|
case IEEE80211_FCTL_TODS:
|
|
return hdr->addr1;
|
|
case (IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS):
|
|
return NULL;
|
|
case IEEE80211_FCTL_FROMDS:
|
|
return hdr->addr2;
|
|
case 0:
|
|
return hdr->addr3;
|
|
}
|
|
break;
|
|
case IEEE80211_FTYPE_MGMT:
|
|
if (len < 24) /* drop incorrect hdr len (mgmt) */
|
|
return NULL;
|
|
return hdr->addr3;
|
|
case IEEE80211_FTYPE_CTL:
|
|
if ((fc & IEEE80211_FCTL_STYPE) == IEEE80211_STYPE_PSPOLL)
|
|
return hdr->addr1;
|
|
else if ((fc & IEEE80211_FCTL_STYPE) ==
|
|
IEEE80211_STYPE_BACK_REQ) {
|
|
switch (type) {
|
|
case IEEE80211_IF_TYPE_STA:
|
|
return hdr->addr2;
|
|
case IEEE80211_IF_TYPE_AP:
|
|
case IEEE80211_IF_TYPE_VLAN:
|
|
return hdr->addr1;
|
|
default:
|
|
return NULL;
|
|
}
|
|
}
|
|
else
|
|
return NULL;
|
|
}
|
|
|
|
return NULL;
|
|
}
|
|
|
|
int ieee80211_get_hdrlen(u16 fc)
|
|
{
|
|
int hdrlen = 24;
|
|
|
|
switch (fc & IEEE80211_FCTL_FTYPE) {
|
|
case IEEE80211_FTYPE_DATA:
|
|
if ((fc & IEEE80211_FCTL_FROMDS) && (fc & IEEE80211_FCTL_TODS))
|
|
hdrlen = 30; /* Addr4 */
|
|
/*
|
|
* The QoS Control field is two bytes and its presence is
|
|
* indicated by the IEEE80211_STYPE_QOS_DATA bit. Add 2 to
|
|
* hdrlen if that bit is set.
|
|
* This works by masking out the bit and shifting it to
|
|
* bit position 1 so the result has the value 0 or 2.
|
|
*/
|
|
hdrlen += (fc & IEEE80211_STYPE_QOS_DATA)
|
|
>> (ilog2(IEEE80211_STYPE_QOS_DATA)-1);
|
|
break;
|
|
case IEEE80211_FTYPE_CTL:
|
|
/*
|
|
* ACK and CTS are 10 bytes, all others 16. To see how
|
|
* to get this condition consider
|
|
* subtype mask: 0b0000000011110000 (0x00F0)
|
|
* ACK subtype: 0b0000000011010000 (0x00D0)
|
|
* CTS subtype: 0b0000000011000000 (0x00C0)
|
|
* bits that matter: ^^^ (0x00E0)
|
|
* value of those: 0b0000000011000000 (0x00C0)
|
|
*/
|
|
if ((fc & 0xE0) == 0xC0)
|
|
hdrlen = 10;
|
|
else
|
|
hdrlen = 16;
|
|
break;
|
|
}
|
|
|
|
return hdrlen;
|
|
}
|
|
EXPORT_SYMBOL(ieee80211_get_hdrlen);
|
|
|
|
unsigned int ieee80211_hdrlen(__le16 fc)
|
|
{
|
|
unsigned int hdrlen = 24;
|
|
|
|
if (ieee80211_is_data(fc)) {
|
|
if (ieee80211_has_a4(fc))
|
|
hdrlen = 30;
|
|
if (ieee80211_is_data_qos(fc))
|
|
hdrlen += IEEE80211_QOS_CTL_LEN;
|
|
goto out;
|
|
}
|
|
|
|
if (ieee80211_is_ctl(fc)) {
|
|
/*
|
|
* ACK and CTS are 10 bytes, all others 16. To see how
|
|
* to get this condition consider
|
|
* subtype mask: 0b0000000011110000 (0x00F0)
|
|
* ACK subtype: 0b0000000011010000 (0x00D0)
|
|
* CTS subtype: 0b0000000011000000 (0x00C0)
|
|
* bits that matter: ^^^ (0x00E0)
|
|
* value of those: 0b0000000011000000 (0x00C0)
|
|
*/
|
|
if ((fc & cpu_to_le16(0x00E0)) == cpu_to_le16(0x00C0))
|
|
hdrlen = 10;
|
|
else
|
|
hdrlen = 16;
|
|
}
|
|
out:
|
|
return hdrlen;
|
|
}
|
|
EXPORT_SYMBOL(ieee80211_hdrlen);
|
|
|
|
unsigned int ieee80211_get_hdrlen_from_skb(const struct sk_buff *skb)
|
|
{
|
|
const struct ieee80211_hdr *hdr = (const struct ieee80211_hdr *)skb->data;
|
|
unsigned int hdrlen;
|
|
|
|
if (unlikely(skb->len < 10))
|
|
return 0;
|
|
hdrlen = ieee80211_hdrlen(hdr->frame_control);
|
|
if (unlikely(hdrlen > skb->len))
|
|
return 0;
|
|
return hdrlen;
|
|
}
|
|
EXPORT_SYMBOL(ieee80211_get_hdrlen_from_skb);
|
|
|
|
int ieee80211_get_mesh_hdrlen(struct ieee80211s_hdr *meshhdr)
|
|
{
|
|
int ae = meshhdr->flags & IEEE80211S_FLAGS_AE;
|
|
/* 7.1.3.5a.2 */
|
|
switch (ae) {
|
|
case 0:
|
|
return 6;
|
|
case 1:
|
|
return 12;
|
|
case 2:
|
|
return 18;
|
|
case 3:
|
|
return 24;
|
|
default:
|
|
return 6;
|
|
}
|
|
}
|
|
|
|
void ieee80211_tx_set_protected(struct ieee80211_tx_data *tx)
|
|
{
|
|
struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) tx->skb->data;
|
|
|
|
hdr->frame_control |= cpu_to_le16(IEEE80211_FCTL_PROTECTED);
|
|
if (tx->extra_frag) {
|
|
struct ieee80211_hdr *fhdr;
|
|
int i;
|
|
for (i = 0; i < tx->num_extra_frag; i++) {
|
|
fhdr = (struct ieee80211_hdr *)
|
|
tx->extra_frag[i]->data;
|
|
fhdr->frame_control |= cpu_to_le16(IEEE80211_FCTL_PROTECTED);
|
|
}
|
|
}
|
|
}
|
|
|
|
int ieee80211_frame_duration(struct ieee80211_local *local, size_t len,
|
|
int rate, int erp, int short_preamble)
|
|
{
|
|
int dur;
|
|
|
|
/* calculate duration (in microseconds, rounded up to next higher
|
|
* integer if it includes a fractional microsecond) to send frame of
|
|
* len bytes (does not include FCS) at the given rate. Duration will
|
|
* also include SIFS.
|
|
*
|
|
* rate is in 100 kbps, so divident is multiplied by 10 in the
|
|
* DIV_ROUND_UP() operations.
|
|
*/
|
|
|
|
if (local->hw.conf.channel->band == IEEE80211_BAND_5GHZ || erp) {
|
|
/*
|
|
* OFDM:
|
|
*
|
|
* N_DBPS = DATARATE x 4
|
|
* N_SYM = Ceiling((16+8xLENGTH+6) / N_DBPS)
|
|
* (16 = SIGNAL time, 6 = tail bits)
|
|
* TXTIME = T_PREAMBLE + T_SIGNAL + T_SYM x N_SYM + Signal Ext
|
|
*
|
|
* T_SYM = 4 usec
|
|
* 802.11a - 17.5.2: aSIFSTime = 16 usec
|
|
* 802.11g - 19.8.4: aSIFSTime = 10 usec +
|
|
* signal ext = 6 usec
|
|
*/
|
|
dur = 16; /* SIFS + signal ext */
|
|
dur += 16; /* 17.3.2.3: T_PREAMBLE = 16 usec */
|
|
dur += 4; /* 17.3.2.3: T_SIGNAL = 4 usec */
|
|
dur += 4 * DIV_ROUND_UP((16 + 8 * (len + 4) + 6) * 10,
|
|
4 * rate); /* T_SYM x N_SYM */
|
|
} else {
|
|
/*
|
|
* 802.11b or 802.11g with 802.11b compatibility:
|
|
* 18.3.4: TXTIME = PreambleLength + PLCPHeaderTime +
|
|
* Ceiling(((LENGTH+PBCC)x8)/DATARATE). PBCC=0.
|
|
*
|
|
* 802.11 (DS): 15.3.3, 802.11b: 18.3.4
|
|
* aSIFSTime = 10 usec
|
|
* aPreambleLength = 144 usec or 72 usec with short preamble
|
|
* aPLCPHeaderLength = 48 usec or 24 usec with short preamble
|
|
*/
|
|
dur = 10; /* aSIFSTime = 10 usec */
|
|
dur += short_preamble ? (72 + 24) : (144 + 48);
|
|
|
|
dur += DIV_ROUND_UP(8 * (len + 4) * 10, rate);
|
|
}
|
|
|
|
return dur;
|
|
}
|
|
|
|
/* Exported duration function for driver use */
|
|
__le16 ieee80211_generic_frame_duration(struct ieee80211_hw *hw,
|
|
struct ieee80211_vif *vif,
|
|
size_t frame_len,
|
|
struct ieee80211_rate *rate)
|
|
{
|
|
struct ieee80211_local *local = hw_to_local(hw);
|
|
struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
|
|
u16 dur;
|
|
int erp;
|
|
|
|
erp = 0;
|
|
if (sdata->flags & IEEE80211_SDATA_OPERATING_GMODE)
|
|
erp = rate->flags & IEEE80211_RATE_ERP_G;
|
|
|
|
dur = ieee80211_frame_duration(local, frame_len, rate->bitrate, erp,
|
|
sdata->bss_conf.use_short_preamble);
|
|
|
|
return cpu_to_le16(dur);
|
|
}
|
|
EXPORT_SYMBOL(ieee80211_generic_frame_duration);
|
|
|
|
__le16 ieee80211_rts_duration(struct ieee80211_hw *hw,
|
|
struct ieee80211_vif *vif, size_t frame_len,
|
|
const struct ieee80211_tx_info *frame_txctl)
|
|
{
|
|
struct ieee80211_local *local = hw_to_local(hw);
|
|
struct ieee80211_rate *rate;
|
|
struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
|
|
bool short_preamble;
|
|
int erp;
|
|
u16 dur;
|
|
struct ieee80211_supported_band *sband;
|
|
|
|
sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
|
|
|
|
short_preamble = sdata->bss_conf.use_short_preamble;
|
|
|
|
rate = &sband->bitrates[frame_txctl->control.rts_cts_rate_idx];
|
|
|
|
erp = 0;
|
|
if (sdata->flags & IEEE80211_SDATA_OPERATING_GMODE)
|
|
erp = rate->flags & IEEE80211_RATE_ERP_G;
|
|
|
|
/* CTS duration */
|
|
dur = ieee80211_frame_duration(local, 10, rate->bitrate,
|
|
erp, short_preamble);
|
|
/* Data frame duration */
|
|
dur += ieee80211_frame_duration(local, frame_len, rate->bitrate,
|
|
erp, short_preamble);
|
|
/* ACK duration */
|
|
dur += ieee80211_frame_duration(local, 10, rate->bitrate,
|
|
erp, short_preamble);
|
|
|
|
return cpu_to_le16(dur);
|
|
}
|
|
EXPORT_SYMBOL(ieee80211_rts_duration);
|
|
|
|
__le16 ieee80211_ctstoself_duration(struct ieee80211_hw *hw,
|
|
struct ieee80211_vif *vif,
|
|
size_t frame_len,
|
|
const struct ieee80211_tx_info *frame_txctl)
|
|
{
|
|
struct ieee80211_local *local = hw_to_local(hw);
|
|
struct ieee80211_rate *rate;
|
|
struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
|
|
bool short_preamble;
|
|
int erp;
|
|
u16 dur;
|
|
struct ieee80211_supported_band *sband;
|
|
|
|
sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
|
|
|
|
short_preamble = sdata->bss_conf.use_short_preamble;
|
|
|
|
rate = &sband->bitrates[frame_txctl->control.rts_cts_rate_idx];
|
|
erp = 0;
|
|
if (sdata->flags & IEEE80211_SDATA_OPERATING_GMODE)
|
|
erp = rate->flags & IEEE80211_RATE_ERP_G;
|
|
|
|
/* Data frame duration */
|
|
dur = ieee80211_frame_duration(local, frame_len, rate->bitrate,
|
|
erp, short_preamble);
|
|
if (!(frame_txctl->flags & IEEE80211_TX_CTL_NO_ACK)) {
|
|
/* ACK duration */
|
|
dur += ieee80211_frame_duration(local, 10, rate->bitrate,
|
|
erp, short_preamble);
|
|
}
|
|
|
|
return cpu_to_le16(dur);
|
|
}
|
|
EXPORT_SYMBOL(ieee80211_ctstoself_duration);
|
|
|
|
void ieee80211_wake_queue(struct ieee80211_hw *hw, int queue)
|
|
{
|
|
struct ieee80211_local *local = hw_to_local(hw);
|
|
|
|
if (test_bit(queue, local->queues_pending)) {
|
|
tasklet_schedule(&local->tx_pending_tasklet);
|
|
} else {
|
|
if (ieee80211_is_multiqueue(local)) {
|
|
netif_wake_subqueue(local->mdev, queue);
|
|
} else {
|
|
WARN_ON(queue != 0);
|
|
netif_wake_queue(local->mdev);
|
|
}
|
|
}
|
|
}
|
|
EXPORT_SYMBOL(ieee80211_wake_queue);
|
|
|
|
void ieee80211_stop_queue(struct ieee80211_hw *hw, int queue)
|
|
{
|
|
struct ieee80211_local *local = hw_to_local(hw);
|
|
|
|
if (ieee80211_is_multiqueue(local)) {
|
|
netif_stop_subqueue(local->mdev, queue);
|
|
} else {
|
|
WARN_ON(queue != 0);
|
|
netif_stop_queue(local->mdev);
|
|
}
|
|
}
|
|
EXPORT_SYMBOL(ieee80211_stop_queue);
|
|
|
|
void ieee80211_stop_queues(struct ieee80211_hw *hw)
|
|
{
|
|
int i;
|
|
|
|
for (i = 0; i < ieee80211_num_queues(hw); i++)
|
|
ieee80211_stop_queue(hw, i);
|
|
}
|
|
EXPORT_SYMBOL(ieee80211_stop_queues);
|
|
|
|
void ieee80211_wake_queues(struct ieee80211_hw *hw)
|
|
{
|
|
int i;
|
|
|
|
for (i = 0; i < hw->queues + hw->ampdu_queues; i++)
|
|
ieee80211_wake_queue(hw, i);
|
|
}
|
|
EXPORT_SYMBOL(ieee80211_wake_queues);
|
|
|
|
void ieee80211_iterate_active_interfaces(
|
|
struct ieee80211_hw *hw,
|
|
void (*iterator)(void *data, u8 *mac,
|
|
struct ieee80211_vif *vif),
|
|
void *data)
|
|
{
|
|
struct ieee80211_local *local = hw_to_local(hw);
|
|
struct ieee80211_sub_if_data *sdata;
|
|
|
|
rtnl_lock();
|
|
|
|
list_for_each_entry(sdata, &local->interfaces, list) {
|
|
switch (sdata->vif.type) {
|
|
case IEEE80211_IF_TYPE_INVALID:
|
|
case IEEE80211_IF_TYPE_MNTR:
|
|
case IEEE80211_IF_TYPE_VLAN:
|
|
continue;
|
|
case IEEE80211_IF_TYPE_AP:
|
|
case IEEE80211_IF_TYPE_STA:
|
|
case IEEE80211_IF_TYPE_IBSS:
|
|
case IEEE80211_IF_TYPE_WDS:
|
|
case IEEE80211_IF_TYPE_MESH_POINT:
|
|
break;
|
|
}
|
|
if (sdata->dev == local->mdev)
|
|
continue;
|
|
if (netif_running(sdata->dev))
|
|
iterator(data, sdata->dev->dev_addr,
|
|
&sdata->vif);
|
|
}
|
|
|
|
rtnl_unlock();
|
|
}
|
|
EXPORT_SYMBOL_GPL(ieee80211_iterate_active_interfaces);
|
|
|
|
void ieee80211_iterate_active_interfaces_atomic(
|
|
struct ieee80211_hw *hw,
|
|
void (*iterator)(void *data, u8 *mac,
|
|
struct ieee80211_vif *vif),
|
|
void *data)
|
|
{
|
|
struct ieee80211_local *local = hw_to_local(hw);
|
|
struct ieee80211_sub_if_data *sdata;
|
|
|
|
rcu_read_lock();
|
|
|
|
list_for_each_entry_rcu(sdata, &local->interfaces, list) {
|
|
switch (sdata->vif.type) {
|
|
case IEEE80211_IF_TYPE_INVALID:
|
|
case IEEE80211_IF_TYPE_MNTR:
|
|
case IEEE80211_IF_TYPE_VLAN:
|
|
continue;
|
|
case IEEE80211_IF_TYPE_AP:
|
|
case IEEE80211_IF_TYPE_STA:
|
|
case IEEE80211_IF_TYPE_IBSS:
|
|
case IEEE80211_IF_TYPE_WDS:
|
|
case IEEE80211_IF_TYPE_MESH_POINT:
|
|
break;
|
|
}
|
|
if (sdata->dev == local->mdev)
|
|
continue;
|
|
if (netif_running(sdata->dev))
|
|
iterator(data, sdata->dev->dev_addr,
|
|
&sdata->vif);
|
|
}
|
|
|
|
rcu_read_unlock();
|
|
}
|
|
EXPORT_SYMBOL_GPL(ieee80211_iterate_active_interfaces_atomic);
|