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ieee80211.c
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ieee80211.c
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/*
* Copyright 2002-2005, Instant802 Networks, Inc.
* Copyright 2005-2006, Devicescape Software, Inc.
* Copyright 2006-2007 Jiri Benc <[email protected]>
*
* 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 <net/mac80211.h>
#include <net/ieee80211_radiotap.h>
#include <linux/module.h>
#include <linux/init.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/rtnetlink.h>
#include <net/iw_handler.h>
#include <linux/compiler.h>
#include <linux/bitmap.h>
#include <net/cfg80211.h>
#include <asm/unaligned.h>
#include "ieee80211_common.h"
#include "ieee80211_i.h"
#include "ieee80211_rate.h"
#include "wep.h"
#include "wpa.h"
#include "tkip.h"
#include "wme.h"
#include "aes_ccm.h"
#include "ieee80211_led.h"
#include "ieee80211_cfg.h"
#include "debugfs.h"
#include "debugfs_netdev.h"
#include "debugfs_key.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) */
static const unsigned char rfc1042_header[] =
{ 0xaa, 0xaa, 0x03, 0x00, 0x00, 0x00 };
/* Bridge-Tunnel header (for EtherTypes ETH_P_AARP and ETH_P_IPX) */
static const unsigned char bridge_tunnel_header[] =
{ 0xaa, 0xaa, 0x03, 0x00, 0x00, 0xf8 };
/* No encapsulation header if EtherType < 0x600 (=length) */
static const unsigned char eapol_header[] =
{ 0xaa, 0xaa, 0x03, 0x00, 0x00, 0x00, 0x88, 0x8e };
/*
* For seeing transmitted packets on monitor interfaces
* we have a radiotap header too.
*/
struct ieee80211_tx_status_rtap_hdr {
struct ieee80211_radiotap_header hdr;
__le16 tx_flags;
u8 data_retries;
} __attribute__ ((packed));
static inline void ieee80211_include_sequence(struct ieee80211_sub_if_data *sdata,
struct ieee80211_hdr *hdr)
{
/* Set the sequence number for this frame. */
hdr->seq_ctrl = cpu_to_le16(sdata->sequence);
/* Increase the sequence number. */
sdata->sequence = (sdata->sequence + 0x10) & IEEE80211_SCTL_SEQ;
}
struct ieee80211_key_conf *
ieee80211_key_data2conf(struct ieee80211_local *local,
const struct ieee80211_key *data)
{
struct ieee80211_key_conf *conf;
conf = kmalloc(sizeof(*conf) + data->keylen, GFP_ATOMIC);
if (!conf)
return NULL;
conf->hw_key_idx = data->hw_key_idx;
conf->alg = data->alg;
conf->keylen = data->keylen;
conf->flags = 0;
if (data->force_sw_encrypt)
conf->flags |= IEEE80211_KEY_FORCE_SW_ENCRYPT;
conf->keyidx = data->keyidx;
if (data->default_tx_key)
conf->flags |= IEEE80211_KEY_DEFAULT_TX_KEY;
if (local->default_wep_only)
conf->flags |= IEEE80211_KEY_DEFAULT_WEP_ONLY;
memcpy(conf->key, data->key, data->keylen);
return conf;
}
struct ieee80211_key *ieee80211_key_alloc(struct ieee80211_sub_if_data *sdata,
int idx, size_t key_len, gfp_t flags)
{
struct ieee80211_key *key;
key = kzalloc(sizeof(struct ieee80211_key) + key_len, flags);
if (!key)
return NULL;
kref_init(&key->kref);
return key;
}
static void ieee80211_key_release(struct kref *kref)
{
struct ieee80211_key *key;
key = container_of(kref, struct ieee80211_key, kref);
if (key->alg == ALG_CCMP)
ieee80211_aes_key_free(key->u.ccmp.tfm);
ieee80211_debugfs_key_remove(key);
kfree(key);
}
void ieee80211_key_free(struct ieee80211_key *key)
{
if (key)
kref_put(&key->kref, ieee80211_key_release);
}
static int rate_list_match(const int *rate_list, int rate)
{
int i;
if (!rate_list)
return 0;
for (i = 0; rate_list[i] >= 0; i++)
if (rate_list[i] == rate)
return 1;
return 0;
}
void ieee80211_prepare_rates(struct ieee80211_local *local,
struct ieee80211_hw_mode *mode)
{
int i;
for (i = 0; i < mode->num_rates; i++) {
struct ieee80211_rate *rate = &mode->rates[i];
rate->flags &= ~(IEEE80211_RATE_SUPPORTED |
IEEE80211_RATE_BASIC);
if (local->supp_rates[mode->mode]) {
if (!rate_list_match(local->supp_rates[mode->mode],
rate->rate))
continue;
}
rate->flags |= IEEE80211_RATE_SUPPORTED;
/* Use configured basic rate set if it is available. If not,
* use defaults that are sane for most cases. */
if (local->basic_rates[mode->mode]) {
if (rate_list_match(local->basic_rates[mode->mode],
rate->rate))
rate->flags |= IEEE80211_RATE_BASIC;
} else switch (mode->mode) {
case MODE_IEEE80211A:
if (rate->rate == 60 || rate->rate == 120 ||
rate->rate == 240)
rate->flags |= IEEE80211_RATE_BASIC;
break;
case MODE_IEEE80211B:
if (rate->rate == 10 || rate->rate == 20)
rate->flags |= IEEE80211_RATE_BASIC;
break;
case MODE_ATHEROS_TURBO:
if (rate->rate == 120 || rate->rate == 240 ||
rate->rate == 480)
rate->flags |= IEEE80211_RATE_BASIC;
break;
case MODE_IEEE80211G:
if (rate->rate == 10 || rate->rate == 20 ||
rate->rate == 55 || rate->rate == 110)
rate->flags |= IEEE80211_RATE_BASIC;
break;
}
/* Set ERP and MANDATORY flags based on phymode */
switch (mode->mode) {
case MODE_IEEE80211A:
if (rate->rate == 60 || rate->rate == 120 ||
rate->rate == 240)
rate->flags |= IEEE80211_RATE_MANDATORY;
break;
case MODE_IEEE80211B:
if (rate->rate == 10)
rate->flags |= IEEE80211_RATE_MANDATORY;
break;
case MODE_ATHEROS_TURBO:
break;
case MODE_IEEE80211G:
if (rate->rate == 10 || rate->rate == 20 ||
rate->rate == 55 || rate->rate == 110 ||
rate->rate == 60 || rate->rate == 120 ||
rate->rate == 240)
rate->flags |= IEEE80211_RATE_MANDATORY;
break;
}
if (ieee80211_is_erp_rate(mode->mode, rate->rate))
rate->flags |= IEEE80211_RATE_ERP;
}
}
static void ieee80211_key_threshold_notify(struct net_device *dev,
struct ieee80211_key *key,
struct sta_info *sta)
{
struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
struct sk_buff *skb;
struct ieee80211_msg_key_notification *msg;
/* if no one will get it anyway, don't even allocate it.
* unlikely because this is only relevant for APs
* where the device must be open... */
if (unlikely(!local->apdev))
return;
skb = dev_alloc_skb(sizeof(struct ieee80211_frame_info) +
sizeof(struct ieee80211_msg_key_notification));
if (!skb)
return;
skb_reserve(skb, sizeof(struct ieee80211_frame_info));
msg = (struct ieee80211_msg_key_notification *)
skb_put(skb, sizeof(struct ieee80211_msg_key_notification));
msg->tx_rx_count = key->tx_rx_count;
memcpy(msg->ifname, dev->name, IFNAMSIZ);
if (sta)
memcpy(msg->addr, sta->addr, ETH_ALEN);
else
memset(msg->addr, 0xff, ETH_ALEN);
key->tx_rx_count = 0;
ieee80211_rx_mgmt(local, skb, NULL,
ieee80211_msg_key_threshold_notification);
}
static u8 * ieee80211_get_bssid(struct ieee80211_hdr *hdr, size_t len)
{
u16 fc;
if (len < 24)
return NULL;
fc = le16_to_cpu(hdr->frame_control);
switch (fc & IEEE80211_FCTL_FTYPE) {
case IEEE80211_FTYPE_DATA:
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:
return hdr->addr3;
case IEEE80211_FTYPE_CTL:
if ((fc & IEEE80211_FCTL_STYPE) == IEEE80211_STYPE_PSPOLL)
return hdr->addr1;
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);
int ieee80211_get_hdrlen_from_skb(const struct sk_buff *skb)
{
const struct ieee80211_hdr *hdr = (const struct ieee80211_hdr *) skb->data;
int hdrlen;
if (unlikely(skb->len < 10))
return 0;
hdrlen = ieee80211_get_hdrlen(le16_to_cpu(hdr->frame_control));
if (unlikely(hdrlen > skb->len))
return 0;
return hdrlen;
}
EXPORT_SYMBOL(ieee80211_get_hdrlen_from_skb);
static int ieee80211_get_radiotap_len(struct sk_buff *skb)
{
struct ieee80211_radiotap_header *hdr =
(struct ieee80211_radiotap_header *) skb->data;
return le16_to_cpu(hdr->it_len);
}
#ifdef CONFIG_MAC80211_LOWTX_FRAME_DUMP
static void ieee80211_dump_frame(const char *ifname, const char *title,
const struct sk_buff *skb)
{
const struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
u16 fc;
int hdrlen;
printk(KERN_DEBUG "%s: %s (len=%d)", ifname, title, skb->len);
if (skb->len < 4) {
printk("\n");
return;
}
fc = le16_to_cpu(hdr->frame_control);
hdrlen = ieee80211_get_hdrlen(fc);
if (hdrlen > skb->len)
hdrlen = skb->len;
if (hdrlen >= 4)
printk(" FC=0x%04x DUR=0x%04x",
fc, le16_to_cpu(hdr->duration_id));
if (hdrlen >= 10)
printk(" A1=" MAC_FMT, MAC_ARG(hdr->addr1));
if (hdrlen >= 16)
printk(" A2=" MAC_FMT, MAC_ARG(hdr->addr2));
if (hdrlen >= 24)
printk(" A3=" MAC_FMT, MAC_ARG(hdr->addr3));
if (hdrlen >= 30)
printk(" A4=" MAC_FMT, MAC_ARG(hdr->addr4));
printk("\n");
}
#else /* CONFIG_MAC80211_LOWTX_FRAME_DUMP */
static inline void ieee80211_dump_frame(const char *ifname, const char *title,
struct sk_buff *skb)
{
}
#endif /* CONFIG_MAC80211_LOWTX_FRAME_DUMP */
static int ieee80211_is_eapol(const struct sk_buff *skb)
{
const struct ieee80211_hdr *hdr;
u16 fc;
int hdrlen;
if (unlikely(skb->len < 10))
return 0;
hdr = (const struct ieee80211_hdr *) skb->data;
fc = le16_to_cpu(hdr->frame_control);
if (unlikely(!WLAN_FC_DATA_PRESENT(fc)))
return 0;
hdrlen = ieee80211_get_hdrlen(fc);
if (unlikely(skb->len >= hdrlen + sizeof(eapol_header) &&
memcmp(skb->data + hdrlen, eapol_header,
sizeof(eapol_header)) == 0))
return 1;
return 0;
}
static ieee80211_txrx_result
ieee80211_tx_h_rate_ctrl(struct ieee80211_txrx_data *tx)
{
struct rate_control_extra extra;
memset(&extra, 0, sizeof(extra));
extra.mode = tx->u.tx.mode;
extra.mgmt_data = tx->sdata &&
tx->sdata->type == IEEE80211_IF_TYPE_MGMT;
extra.ethertype = tx->ethertype;
tx->u.tx.rate = rate_control_get_rate(tx->local, tx->dev, tx->skb,
&extra);
if (unlikely(extra.probe != NULL)) {
tx->u.tx.control->flags |= IEEE80211_TXCTL_RATE_CTRL_PROBE;
tx->u.tx.probe_last_frag = 1;
tx->u.tx.control->alt_retry_rate = tx->u.tx.rate->val;
tx->u.tx.rate = extra.probe;
} else {
tx->u.tx.control->alt_retry_rate = -1;
}
if (!tx->u.tx.rate)
return TXRX_DROP;
if (tx->u.tx.mode->mode == MODE_IEEE80211G &&
tx->sdata->use_protection && tx->fragmented &&
extra.nonerp) {
tx->u.tx.last_frag_rate = tx->u.tx.rate;
tx->u.tx.probe_last_frag = extra.probe ? 1 : 0;
tx->u.tx.rate = extra.nonerp;
tx->u.tx.control->rate = extra.nonerp;
tx->u.tx.control->flags &= ~IEEE80211_TXCTL_RATE_CTRL_PROBE;
} else {
tx->u.tx.last_frag_rate = tx->u.tx.rate;
tx->u.tx.control->rate = tx->u.tx.rate;
}
tx->u.tx.control->tx_rate = tx->u.tx.rate->val;
if ((tx->u.tx.rate->flags & IEEE80211_RATE_PREAMBLE2) &&
tx->local->short_preamble &&
(!tx->sta || (tx->sta->flags & WLAN_STA_SHORT_PREAMBLE))) {
tx->u.tx.short_preamble = 1;
tx->u.tx.control->tx_rate = tx->u.tx.rate->val2;
}
return TXRX_CONTINUE;
}
static ieee80211_txrx_result
ieee80211_tx_h_select_key(struct ieee80211_txrx_data *tx)
{
if (tx->sta)
tx->u.tx.control->key_idx = tx->sta->key_idx_compression;
else
tx->u.tx.control->key_idx = HW_KEY_IDX_INVALID;
if (unlikely(tx->u.tx.control->flags & IEEE80211_TXCTL_DO_NOT_ENCRYPT))
tx->key = NULL;
else if (tx->sta && tx->sta->key)
tx->key = tx->sta->key;
else if (tx->sdata->default_key)
tx->key = tx->sdata->default_key;
else if (tx->sdata->drop_unencrypted &&
!(tx->sdata->eapol && ieee80211_is_eapol(tx->skb))) {
I802_DEBUG_INC(tx->local->tx_handlers_drop_unencrypted);
return TXRX_DROP;
} else
tx->key = NULL;
if (tx->key) {
tx->key->tx_rx_count++;
if (unlikely(tx->local->key_tx_rx_threshold &&
tx->key->tx_rx_count >
tx->local->key_tx_rx_threshold)) {
ieee80211_key_threshold_notify(tx->dev, tx->key,
tx->sta);
}
}
return TXRX_CONTINUE;
}
static ieee80211_txrx_result
ieee80211_tx_h_fragment(struct ieee80211_txrx_data *tx)
{
struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) tx->skb->data;
size_t hdrlen, per_fragm, num_fragm, payload_len, left;
struct sk_buff **frags, *first, *frag;
int i;
u16 seq;
u8 *pos;
int frag_threshold = tx->local->fragmentation_threshold;
if (!tx->fragmented)
return TXRX_CONTINUE;
first = tx->skb;
hdrlen = ieee80211_get_hdrlen(tx->fc);
payload_len = first->len - hdrlen;
per_fragm = frag_threshold - hdrlen - FCS_LEN;
num_fragm = (payload_len + per_fragm - 1) / per_fragm;
frags = kzalloc(num_fragm * sizeof(struct sk_buff *), GFP_ATOMIC);
if (!frags)
goto fail;
hdr->frame_control |= cpu_to_le16(IEEE80211_FCTL_MOREFRAGS);
seq = le16_to_cpu(hdr->seq_ctrl) & IEEE80211_SCTL_SEQ;
pos = first->data + hdrlen + per_fragm;
left = payload_len - per_fragm;
for (i = 0; i < num_fragm - 1; i++) {
struct ieee80211_hdr *fhdr;
size_t copylen;
if (left <= 0)
goto fail;
/* reserve enough extra head and tail room for possible
* encryption */
frag = frags[i] =
dev_alloc_skb(tx->local->tx_headroom +
frag_threshold +
IEEE80211_ENCRYPT_HEADROOM +
IEEE80211_ENCRYPT_TAILROOM);
if (!frag)
goto fail;
/* Make sure that all fragments use the same priority so
* that they end up using the same TX queue */
frag->priority = first->priority;
skb_reserve(frag, tx->local->tx_headroom +
IEEE80211_ENCRYPT_HEADROOM);
fhdr = (struct ieee80211_hdr *) skb_put(frag, hdrlen);
memcpy(fhdr, first->data, hdrlen);
if (i == num_fragm - 2)
fhdr->frame_control &= cpu_to_le16(~IEEE80211_FCTL_MOREFRAGS);
fhdr->seq_ctrl = cpu_to_le16(seq | ((i + 1) & IEEE80211_SCTL_FRAG));
copylen = left > per_fragm ? per_fragm : left;
memcpy(skb_put(frag, copylen), pos, copylen);
pos += copylen;
left -= copylen;
}
skb_trim(first, hdrlen + per_fragm);
tx->u.tx.num_extra_frag = num_fragm - 1;
tx->u.tx.extra_frag = frags;
return TXRX_CONTINUE;
fail:
printk(KERN_DEBUG "%s: failed to fragment frame\n", tx->dev->name);
if (frags) {
for (i = 0; i < num_fragm - 1; i++)
if (frags[i])
dev_kfree_skb(frags[i]);
kfree(frags);
}
I802_DEBUG_INC(tx->local->tx_handlers_drop_fragment);
return TXRX_DROP;
}
static int wep_encrypt_skb(struct ieee80211_txrx_data *tx, struct sk_buff *skb)
{
if (tx->key->force_sw_encrypt) {
if (ieee80211_wep_encrypt(tx->local, skb, tx->key))
return -1;
} else {
tx->u.tx.control->key_idx = tx->key->hw_key_idx;
if (tx->local->hw.flags & IEEE80211_HW_WEP_INCLUDE_IV) {
if (ieee80211_wep_add_iv(tx->local, skb, tx->key) ==
NULL)
return -1;
}
}
return 0;
}
void ieee80211_tx_set_iswep(struct ieee80211_txrx_data *tx)
{
struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) tx->skb->data;
hdr->frame_control |= cpu_to_le16(IEEE80211_FCTL_PROTECTED);
if (tx->u.tx.extra_frag) {
struct ieee80211_hdr *fhdr;
int i;
for (i = 0; i < tx->u.tx.num_extra_frag; i++) {
fhdr = (struct ieee80211_hdr *)
tx->u.tx.extra_frag[i]->data;
fhdr->frame_control |= cpu_to_le16(IEEE80211_FCTL_PROTECTED);
}
}
}
static ieee80211_txrx_result
ieee80211_tx_h_wep_encrypt(struct ieee80211_txrx_data *tx)
{
struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) tx->skb->data;
u16 fc;
fc = le16_to_cpu(hdr->frame_control);
if (!tx->key || tx->key->alg != ALG_WEP ||
((fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_DATA &&
((fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_MGMT ||
(fc & IEEE80211_FCTL_STYPE) != IEEE80211_STYPE_AUTH)))
return TXRX_CONTINUE;
tx->u.tx.control->iv_len = WEP_IV_LEN;
tx->u.tx.control->icv_len = WEP_ICV_LEN;
ieee80211_tx_set_iswep(tx);
if (wep_encrypt_skb(tx, tx->skb) < 0) {
I802_DEBUG_INC(tx->local->tx_handlers_drop_wep);
return TXRX_DROP;
}
if (tx->u.tx.extra_frag) {
int i;
for (i = 0; i < tx->u.tx.num_extra_frag; i++) {
if (wep_encrypt_skb(tx, tx->u.tx.extra_frag[i]) < 0) {
I802_DEBUG_INC(tx->local->
tx_handlers_drop_wep);
return TXRX_DROP;
}
}
}
return TXRX_CONTINUE;
}
static 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.phymode == MODE_IEEE80211A || erp ||
local->hw.conf.phymode == MODE_ATHEROS_TURBO) {
/*
* 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
*/
/* FIX: Atheros Turbo may have different (shorter) duration? */
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,
size_t frame_len, int rate)
{
struct ieee80211_local *local = hw_to_local(hw);
u16 dur;
int erp;
erp = ieee80211_is_erp_rate(hw->conf.phymode, rate);
dur = ieee80211_frame_duration(local, frame_len, rate,
erp, local->short_preamble);
return cpu_to_le16(dur);
}
EXPORT_SYMBOL(ieee80211_generic_frame_duration);
static u16 ieee80211_duration(struct ieee80211_txrx_data *tx, int group_addr,
int next_frag_len)
{
int rate, mrate, erp, dur, i;
struct ieee80211_rate *txrate = tx->u.tx.rate;
struct ieee80211_local *local = tx->local;
struct ieee80211_hw_mode *mode = tx->u.tx.mode;
erp = txrate->flags & IEEE80211_RATE_ERP;
/*
* data and mgmt (except PS Poll):
* - during CFP: 32768
* - during contention period:
* if addr1 is group address: 0
* if more fragments = 0 and addr1 is individual address: time to
* transmit one ACK plus SIFS
* if more fragments = 1 and addr1 is individual address: time to
* transmit next fragment plus 2 x ACK plus 3 x SIFS
*
* IEEE 802.11, 9.6:
* - control response frame (CTS or ACK) shall be transmitted using the
* same rate as the immediately previous frame in the frame exchange
* sequence, if this rate belongs to the PHY mandatory rates, or else
* at the highest possible rate belonging to the PHY rates in the
* BSSBasicRateSet
*/
if ((tx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_CTL) {
/* TODO: These control frames are not currently sent by
* 80211.o, but should they be implemented, this function
* needs to be updated to support duration field calculation.
*
* RTS: time needed to transmit pending data/mgmt frame plus
* one CTS frame plus one ACK frame plus 3 x SIFS
* CTS: duration of immediately previous RTS minus time
* required to transmit CTS and its SIFS
* ACK: 0 if immediately previous directed data/mgmt had
* more=0, with more=1 duration in ACK frame is duration
* from previous frame minus time needed to transmit ACK
* and its SIFS
* PS Poll: BIT(15) | BIT(14) | aid
*/
return 0;
}
/* data/mgmt */
if (0 /* FIX: data/mgmt during CFP */)
return 32768;
if (group_addr) /* Group address as the destination - no ACK */
return 0;
/* Individual destination address:
* IEEE 802.11, Ch. 9.6 (after IEEE 802.11g changes)
* CTS and ACK frames shall be transmitted using the highest rate in
* basic rate set that is less than or equal to the rate of the
* immediately previous frame and that is using the same modulation
* (CCK or OFDM). If no basic rate set matches with these requirements,
* the highest mandatory rate of the PHY that is less than or equal to
* the rate of the previous frame is used.
* Mandatory rates for IEEE 802.11g PHY: 1, 2, 5.5, 11, 6, 12, 24 Mbps
*/
rate = -1;
mrate = 10; /* use 1 Mbps if everything fails */
for (i = 0; i < mode->num_rates; i++) {
struct ieee80211_rate *r = &mode->rates[i];
if (r->rate > txrate->rate)
break;
if (IEEE80211_RATE_MODULATION(txrate->flags) !=
IEEE80211_RATE_MODULATION(r->flags))
continue;
if (r->flags & IEEE80211_RATE_BASIC)
rate = r->rate;
else if (r->flags & IEEE80211_RATE_MANDATORY)
mrate = r->rate;
}
if (rate == -1) {
/* No matching basic rate found; use highest suitable mandatory
* PHY rate */
rate = mrate;
}
/* Time needed to transmit ACK
* (10 bytes + 4-byte FCS = 112 bits) plus SIFS; rounded up
* to closest integer */
dur = ieee80211_frame_duration(local, 10, rate, erp,
local->short_preamble);
if (next_frag_len) {
/* Frame is fragmented: duration increases with time needed to
* transmit next fragment plus ACK and 2 x SIFS. */
dur *= 2; /* ACK + SIFS */
/* next fragment */
dur += ieee80211_frame_duration(local, next_frag_len,
txrate->rate, erp,
local->short_preamble);
}
return dur;
}
static ieee80211_txrx_result
ieee80211_tx_h_misc(struct ieee80211_txrx_data *tx)
{
struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) tx->skb->data;
u16 dur;
struct ieee80211_tx_control *control = tx->u.tx.control;
struct ieee80211_hw_mode *mode = tx->u.tx.mode;
if (!is_multicast_ether_addr(hdr->addr1)) {
if (tx->skb->len + FCS_LEN > tx->local->rts_threshold &&
tx->local->rts_threshold < IEEE80211_MAX_RTS_THRESHOLD) {
control->flags |= IEEE80211_TXCTL_USE_RTS_CTS;
control->retry_limit =
tx->local->long_retry_limit;
} else {
control->retry_limit =
tx->local->short_retry_limit;
}
} else {
control->retry_limit = 1;
}
if (tx->fragmented) {
/* Do not use multiple retry rates when sending fragmented
* frames.
* TODO: The last fragment could still use multiple retry
* rates. */
control->alt_retry_rate = -1;
}
/* Use CTS protection for unicast frames sent using extended rates if
* there are associated non-ERP stations and RTS/CTS is not configured
* for the frame. */
if (mode->mode == MODE_IEEE80211G &&
(tx->u.tx.rate->flags & IEEE80211_RATE_ERP) &&
tx->u.tx.unicast && tx->sdata->use_protection &&
!(control->flags & IEEE80211_TXCTL_USE_RTS_CTS))
control->flags |= IEEE80211_TXCTL_USE_CTS_PROTECT;
/* Setup duration field for the first fragment of the frame. Duration
* for remaining fragments will be updated when they are being sent
* to low-level driver in ieee80211_tx(). */
dur = ieee80211_duration(tx, is_multicast_ether_addr(hdr->addr1),
tx->fragmented ? tx->u.tx.extra_frag[0]->len :
0);
hdr->duration_id = cpu_to_le16(dur);
if ((control->flags & IEEE80211_TXCTL_USE_RTS_CTS) ||
(control->flags & IEEE80211_TXCTL_USE_CTS_PROTECT)) {
struct ieee80211_rate *rate;
/* Do not use multiple retry rates when using RTS/CTS */
control->alt_retry_rate = -1;
/* Use min(data rate, max base rate) as CTS/RTS rate */
rate = tx->u.tx.rate;
while (rate > mode->rates &&
!(rate->flags & IEEE80211_RATE_BASIC))
rate--;
control->rts_cts_rate = rate->val;
control->rts_rate = rate;
}
if (tx->sta) {
tx->sta->tx_packets++;
tx->sta->tx_fragments++;
tx->sta->tx_bytes += tx->skb->len;
if (tx->u.tx.extra_frag) {
int i;
tx->sta->tx_fragments += tx->u.tx.num_extra_frag;
for (i = 0; i < tx->u.tx.num_extra_frag; i++) {
tx->sta->tx_bytes +=
tx->u.tx.extra_frag[i]->len;
}
}
}
return TXRX_CONTINUE;
}
static ieee80211_txrx_result
ieee80211_tx_h_check_assoc(struct ieee80211_txrx_data *tx)
{
#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
struct sk_buff *skb = tx->skb;
struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
#endif /* CONFIG_MAC80211_VERBOSE_DEBUG */
u32 sta_flags;
if (unlikely(tx->local->sta_scanning != 0) &&
((tx->fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_MGMT ||
(tx->fc & IEEE80211_FCTL_STYPE) != IEEE80211_STYPE_PROBE_REQ))
return TXRX_DROP;
if (tx->u.tx.ps_buffered)
return TXRX_CONTINUE;
sta_flags = tx->sta ? tx->sta->flags : 0;
if (likely(tx->u.tx.unicast)) {
if (unlikely(!(sta_flags & WLAN_STA_ASSOC) &&
tx->sdata->type != IEEE80211_IF_TYPE_IBSS &&
(tx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_DATA)) {
#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
printk(KERN_DEBUG "%s: dropped data frame to not "
"associated station " MAC_FMT "\n",
tx->dev->name, MAC_ARG(hdr->addr1));
#endif /* CONFIG_MAC80211_VERBOSE_DEBUG */
I802_DEBUG_INC(tx->local->tx_handlers_drop_not_assoc);
return TXRX_DROP;
}
} else {
if (unlikely((tx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_DATA &&
tx->local->num_sta == 0 &&
!tx->local->allow_broadcast_always &&
tx->sdata->type != IEEE80211_IF_TYPE_IBSS)) {
/*
* No associated STAs - no need to send multicast
* frames.
*/
return TXRX_DROP;
}
return TXRX_CONTINUE;
}
if (unlikely(!tx->u.tx.mgmt_interface && tx->sdata->ieee802_1x &&
!(sta_flags & WLAN_STA_AUTHORIZED))) {
#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
printk(KERN_DEBUG "%s: dropped frame to " MAC_FMT
" (unauthorized port)\n", tx->dev->name,
MAC_ARG(hdr->addr1));
#endif
I802_DEBUG_INC(tx->local->tx_handlers_drop_unauth_port);
return TXRX_DROP;
}
return TXRX_CONTINUE;
}
static ieee80211_txrx_result
ieee80211_tx_h_sequence(struct ieee80211_txrx_data *tx)
{
struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
if (ieee80211_get_hdrlen(le16_to_cpu(hdr->frame_control)) >= 24)
ieee80211_include_sequence(tx->sdata, hdr);
return TXRX_CONTINUE;
}
/* This function is called whenever the AP is about to exceed the maximum limit
* of buffered frames for power saving STAs. This situation should not really
* happen often during normal operation, so dropping the oldest buffered packet
* from each queue should be OK to make some room for new frames. */
static void purge_old_ps_buffers(struct ieee80211_local *local)
{
int total = 0, purged = 0;
struct sk_buff *skb;
struct ieee80211_sub_if_data *sdata;
struct sta_info *sta;
read_lock(&local->sub_if_lock);
list_for_each_entry(sdata, &local->sub_if_list, list) {