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1f5a7e47ae
linux/net/mac80211/ieee80211.c
Johannes Berg 1f5a7e47ae [MAC80211]: split out some key functions from ieee80211.c 
into a new file key.c which doesn't have much code right now but
it makes ieee80211.c easier to read.

Signed-off-by: Johannes Berg <johannes@sipsolutions.net>
Signed-off-by: Jiri Benc <jbenc@suse.cz>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
2007-10-10 16:47:34 -07:00

2005 lines
54 KiB
C
Raw Blame History

/*
* Copyright 2002-2005, Instant802 Networks, Inc.
* Copyright 2005-2006, Devicescape Software, Inc.
* Copyright 2006-2007 Jiri Benc <jbenc@suse.cz>
*
* 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 <linux/bitmap.h>
#include <net/cfg80211.h>
#include "ieee80211_common.h"
#include "ieee80211_i.h"
#include "ieee80211_rate.h"
#include "wep.h"
#include "wme.h"
#include "aes_ccm.h"
#include "ieee80211_led.h"
#include "ieee80211_cfg.h"
#include "debugfs.h"
#include "debugfs_netdev.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[] =
{ 0xaa, 0xaa, 0x03, 0x00, 0x00, 0x00 };
/* Bridge-Tunnel header (for EtherTypes ETH_P_AARP and ETH_P_IPX) */
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 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;
}
}
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);
}
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);
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;
}
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 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);
__le16 ieee80211_rts_duration(struct ieee80211_hw *hw,
size_t frame_len,
const struct ieee80211_tx_control *frame_txctl)
{
struct ieee80211_local *local = hw_to_local(hw);
struct ieee80211_rate *rate;
int short_preamble = local->short_preamble;
int erp;
u16 dur;
rate = frame_txctl->rts_rate;
erp = !!(rate->flags & IEEE80211_RATE_ERP);
/* CTS duration */
dur = ieee80211_frame_duration(local, 10, rate->rate,
erp, short_preamble);
/* Data frame duration */
dur += ieee80211_frame_duration(local, frame_len, rate->rate,
erp, short_preamble);
/* ACK duration */
dur += ieee80211_frame_duration(local, 10, rate->rate,
erp, short_preamble);
return cpu_to_le16(dur);
}
EXPORT_SYMBOL(ieee80211_rts_duration);
__le16 ieee80211_ctstoself_duration(struct ieee80211_hw *hw,
size_t frame_len,
const struct ieee80211_tx_control *frame_txctl)
{
struct ieee80211_local *local = hw_to_local(hw);
struct ieee80211_rate *rate;
int short_preamble = local->short_preamble;
int erp;
u16 dur;
rate = frame_txctl->rts_rate;
erp = !!(rate->flags & IEEE80211_RATE_ERP);
/* Data frame duration */
dur = ieee80211_frame_duration(local, frame_len, rate->rate,
erp, short_preamble);
if (!(frame_txctl->flags & IEEE80211_TXCTL_NO_ACK)) {
/* ACK duration */
dur += ieee80211_frame_duration(local, 10, rate->rate,
erp, short_preamble);
}
return cpu_to_le16(dur);
}
EXPORT_SYMBOL(ieee80211_ctstoself_duration);
static int __ieee80211_if_config(struct net_device *dev,
struct sk_buff *beacon,
struct ieee80211_tx_control *control)
{
struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
struct ieee80211_if_conf conf;
static u8 scan_bssid[] = { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff };
if (!local->ops->config_interface || !netif_running(dev))
return 0;
memset(&conf, 0, sizeof(conf));
conf.type = sdata->type;
if (sdata->type == IEEE80211_IF_TYPE_STA ||
sdata->type == IEEE80211_IF_TYPE_IBSS) {
if (local->sta_scanning &&
local->scan_dev == dev)
conf.bssid = scan_bssid;
else
conf.bssid = sdata->u.sta.bssid;
conf.ssid = sdata->u.sta.ssid;
conf.ssid_len = sdata->u.sta.ssid_len;
conf.generic_elem = sdata->u.sta.extra_ie;
conf.generic_elem_len = sdata->u.sta.extra_ie_len;
} else if (sdata->type == IEEE80211_IF_TYPE_AP) {
conf.ssid = sdata->u.ap.ssid;
conf.ssid_len = sdata->u.ap.ssid_len;
conf.generic_elem = sdata->u.ap.generic_elem;
conf.generic_elem_len = sdata->u.ap.generic_elem_len;
conf.beacon = beacon;
conf.beacon_control = control;
}
return local->ops->config_interface(local_to_hw(local),
dev->ifindex, &conf);
}
int ieee80211_if_config(struct net_device *dev)
{
return __ieee80211_if_config(dev, NULL, NULL);
}
int ieee80211_if_config_beacon(struct net_device *dev)
{
struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
struct ieee80211_tx_control control;
struct sk_buff *skb;
if (!(local->hw.flags & IEEE80211_HW_HOST_GEN_BEACON_TEMPLATE))
return 0;
skb = ieee80211_beacon_get(local_to_hw(local), dev->ifindex, &control);
if (!skb)
return -ENOMEM;
return __ieee80211_if_config(dev, skb, &control);
}
int ieee80211_hw_config(struct ieee80211_local *local)
{
struct ieee80211_hw_mode *mode;
struct ieee80211_channel *chan;
int ret = 0;
if (local->sta_scanning) {
chan = local->scan_channel;
mode = local->scan_hw_mode;
} else {
chan = local->oper_channel;
mode = local->oper_hw_mode;
}
local->hw.conf.channel = chan->chan;
local->hw.conf.channel_val = chan->val;
local->hw.conf.power_level = chan->power_level;
local->hw.conf.freq = chan->freq;
local->hw.conf.phymode = mode->mode;
local->hw.conf.antenna_max = chan->antenna_max;
local->hw.conf.chan = chan;
local->hw.conf.mode = mode;
#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
printk(KERN_DEBUG "HW CONFIG: channel=%d freq=%d "
"phymode=%d\n", local->hw.conf.channel, local->hw.conf.freq,
local->hw.conf.phymode);
#endif /* CONFIG_MAC80211_VERBOSE_DEBUG */
if (local->ops->config)
ret = local->ops->config(local_to_hw(local), &local->hw.conf);
return ret;
}
static int ieee80211_change_mtu(struct net_device *dev, int new_mtu)
{
/* FIX: what would be proper limits for MTU?
* This interface uses 802.3 frames. */
if (new_mtu < 256 || new_mtu > IEEE80211_MAX_DATA_LEN - 24 - 6) {
printk(KERN_WARNING "%s: invalid MTU %d\n",
dev->name, new_mtu);
return -EINVAL;
}
#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
printk(KERN_DEBUG "%s: setting MTU %d\n", dev->name, new_mtu);
#endif /* CONFIG_MAC80211_VERBOSE_DEBUG */
dev->mtu = new_mtu;
return 0;
}
static int ieee80211_change_mtu_apdev(struct net_device *dev, int new_mtu)
{
/* FIX: what would be proper limits for MTU?
* This interface uses 802.11 frames. */
if (new_mtu < 256 || new_mtu > IEEE80211_MAX_DATA_LEN) {
printk(KERN_WARNING "%s: invalid MTU %d\n",
dev->name, new_mtu);
return -EINVAL;
}
#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
printk(KERN_DEBUG "%s: setting MTU %d\n", dev->name, new_mtu);
#endif /* CONFIG_MAC80211_VERBOSE_DEBUG */
dev->mtu = new_mtu;
return 0;
}
enum netif_tx_lock_class {
TX_LOCK_NORMAL,
TX_LOCK_MASTER,
};
static inline void netif_tx_lock_nested(struct net_device *dev, int subclass)
{
spin_lock_nested(&dev->_xmit_lock, subclass);
dev->xmit_lock_owner = smp_processor_id();
}
static void ieee80211_set_multicast_list(struct net_device *dev)
{
struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
unsigned short flags;
netif_tx_lock_nested(local->mdev, TX_LOCK_MASTER);
if (((dev->flags & IFF_ALLMULTI) != 0) ^ (sdata->allmulti != 0)) {
if (sdata->allmulti) {
sdata->allmulti = 0;
local->iff_allmultis--;
} else {
sdata->allmulti = 1;
local->iff_allmultis++;
}
}
if (((dev->flags & IFF_PROMISC) != 0) ^ (sdata->promisc != 0)) {
if (sdata->promisc) {
sdata->promisc = 0;
local->iff_promiscs--;
} else {
sdata->promisc = 1;
local->iff_promiscs++;
}
}
if (dev->mc_count != sdata->mc_count) {
local->mc_count = local->mc_count - sdata->mc_count +
dev->mc_count;
sdata->mc_count = dev->mc_count;
}
if (local->ops->set_multicast_list) {
flags = local->mdev->flags;
if (local->iff_allmultis)
flags |= IFF_ALLMULTI;
if (local->iff_promiscs)
flags |= IFF_PROMISC;
read_lock(&local->sub_if_lock);
local->ops->set_multicast_list(local_to_hw(local), flags,
local->mc_count);
read_unlock(&local->sub_if_lock);
}
netif_tx_unlock(local->mdev);
}
struct dev_mc_list *ieee80211_get_mc_list_item(struct ieee80211_hw *hw,
struct dev_mc_list *prev,
void **ptr)
{
struct ieee80211_local *local = hw_to_local(hw);
struct ieee80211_sub_if_data *sdata = *ptr;
struct dev_mc_list *mc;
if (!prev) {
WARN_ON(sdata);
sdata = NULL;
}
if (!prev || !prev->next) {
if (sdata)
sdata = list_entry(sdata->list.next,
struct ieee80211_sub_if_data, list);
else
sdata = list_entry(local->sub_if_list.next,
struct ieee80211_sub_if_data, list);
if (&sdata->list != &local->sub_if_list)
mc = sdata->dev->mc_list;
else
mc = NULL;
} else
mc = prev->next;
*ptr = sdata;
return mc;
}
EXPORT_SYMBOL(ieee80211_get_mc_list_item);
static struct net_device_stats *ieee80211_get_stats(struct net_device *dev)
{
struct ieee80211_sub_if_data *sdata;
sdata = IEEE80211_DEV_TO_SUB_IF(dev);
return &(sdata->stats);
}
static void ieee80211_if_shutdown(struct net_device *dev)
{
struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
ASSERT_RTNL();
switch (sdata->type) {
case IEEE80211_IF_TYPE_STA:
case IEEE80211_IF_TYPE_IBSS:
sdata->u.sta.state = IEEE80211_DISABLED;
del_timer_sync(&sdata->u.sta.timer);
skb_queue_purge(&sdata->u.sta.skb_queue);
if (!local->ops->hw_scan &&
local->scan_dev == sdata->dev) {
local->sta_scanning = 0;
cancel_delayed_work(&local->scan_work);
}
flush_workqueue(local->hw.workqueue);
break;
}
}
static inline int identical_mac_addr_allowed(int type1, int type2)
{
return (type1 == IEEE80211_IF_TYPE_MNTR ||
type2 == IEEE80211_IF_TYPE_MNTR ||
(type1 == IEEE80211_IF_TYPE_AP &&
type2 == IEEE80211_IF_TYPE_WDS) ||
(type1 == IEEE80211_IF_TYPE_WDS &&
(type2 == IEEE80211_IF_TYPE_WDS ||
type2 == IEEE80211_IF_TYPE_AP)) ||
(type1 == IEEE80211_IF_TYPE_AP &&
type2 == IEEE80211_IF_TYPE_VLAN) ||
(type1 == IEEE80211_IF_TYPE_VLAN &&
(type2 == IEEE80211_IF_TYPE_AP ||
type2 == IEEE80211_IF_TYPE_VLAN)));
}
static int ieee80211_master_open(struct net_device *dev)
{
struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
struct ieee80211_sub_if_data *sdata;
int res = -EOPNOTSUPP;
read_lock(&local->sub_if_lock);
list_for_each_entry(sdata, &local->sub_if_list, list) {
if (sdata->dev != dev && netif_running(sdata->dev)) {
res = 0;
break;
}
}
read_unlock(&local->sub_if_lock);
return res;
}
static int ieee80211_master_stop(struct net_device *dev)
{
struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
struct ieee80211_sub_if_data *sdata;
read_lock(&local->sub_if_lock);
list_for_each_entry(sdata, &local->sub_if_list, list)
if (sdata->dev != dev && netif_running(sdata->dev))
dev_close(sdata->dev);
read_unlock(&local->sub_if_lock);
return 0;
}
static int ieee80211_mgmt_open(struct net_device *dev)
{
struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
if (!netif_running(local->mdev))
return -EOPNOTSUPP;
return 0;
}
static int ieee80211_mgmt_stop(struct net_device *dev)
{
return 0;
}
/* Check if running monitor interfaces should go to a "soft monitor" mode
* and switch them if necessary. */
static inline void ieee80211_start_soft_monitor(struct ieee80211_local *local)
{
struct ieee80211_if_init_conf conf;
if (local->open_count && local->open_count == local->monitors &&
!(local->hw.flags & IEEE80211_HW_MONITOR_DURING_OPER) &&
local->ops->remove_interface) {
conf.if_id = -1;
conf.type = IEEE80211_IF_TYPE_MNTR;
conf.mac_addr = NULL;
local->ops->remove_interface(local_to_hw(local), &conf);
}
}
/* Check if running monitor interfaces should go to a "hard monitor" mode
* and switch them if necessary. */
static void ieee80211_start_hard_monitor(struct ieee80211_local *local)
{
struct ieee80211_if_init_conf conf;
if (local->open_count && local->open_count == local->monitors &&
!(local->hw.flags & IEEE80211_HW_MONITOR_DURING_OPER)) {
conf.if_id = -1;
conf.type = IEEE80211_IF_TYPE_MNTR;
conf.mac_addr = NULL;
local->ops->add_interface(local_to_hw(local), &conf);
}
}
static int ieee80211_open(struct net_device *dev)
{
struct ieee80211_sub_if_data *sdata, *nsdata;
struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
struct ieee80211_if_init_conf conf;
int res;
sdata = IEEE80211_DEV_TO_SUB_IF(dev);
read_lock(&local->sub_if_lock);
list_for_each_entry(nsdata, &local->sub_if_list, list) {
struct net_device *ndev = nsdata->dev;
if (ndev != dev && ndev != local->mdev && netif_running(ndev) &&
compare_ether_addr(dev->dev_addr, ndev->dev_addr) == 0 &&
!identical_mac_addr_allowed(sdata->type, nsdata->type)) {
read_unlock(&local->sub_if_lock);
return -ENOTUNIQ;
}
}
read_unlock(&local->sub_if_lock);
if (sdata->type == IEEE80211_IF_TYPE_WDS &&
is_zero_ether_addr(sdata->u.wds.remote_addr))
return -ENOLINK;
if (sdata->type == IEEE80211_IF_TYPE_MNTR && local->open_count &&
!(local->hw.flags & IEEE80211_HW_MONITOR_DURING_OPER)) {
/* run the interface in a "soft monitor" mode */
local->monitors++;
local->open_count++;
local->hw.conf.flags |= IEEE80211_CONF_RADIOTAP;
return 0;
}
ieee80211_start_soft_monitor(local);
conf.if_id = dev->ifindex;
conf.type = sdata->type;
conf.mac_addr = dev->dev_addr;
res = local->ops->add_interface(local_to_hw(local), &conf);
if (res) {
if (sdata->type == IEEE80211_IF_TYPE_MNTR)
ieee80211_start_hard_monitor(local);
return res;
}
if (local->open_count == 0) {
res = 0;
tasklet_enable(&local->tx_pending_tasklet);
tasklet_enable(&local->tasklet);
if (local->ops->open)
res = local->ops->open(local_to_hw(local));
if (res == 0) {
res = dev_open(local->mdev);
if (res) {
if (local->ops->stop)
local->ops->stop(local_to_hw(local));
} else {
res = ieee80211_hw_config(local);
if (res && local->ops->stop)
local->ops->stop(local_to_hw(local));
else if (!res && local->apdev)
dev_open(local->apdev);
}
}
if (res) {
if (local->ops->remove_interface)
local->ops->remove_interface(local_to_hw(local),
&conf);
return res;
}
}
local->open_count++;
if (sdata->type == IEEE80211_IF_TYPE_MNTR) {
local->monitors++;
local->hw.conf.flags |= IEEE80211_CONF_RADIOTAP;
} else
ieee80211_if_config(dev);
if (sdata->type == IEEE80211_IF_TYPE_STA &&
!local->user_space_mlme)
netif_carrier_off(dev);
else
netif_carrier_on(dev);
netif_start_queue(dev);
return 0;
}
static int ieee80211_stop(struct net_device *dev)
{
struct ieee80211_sub_if_data *sdata;
struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
sdata = IEEE80211_DEV_TO_SUB_IF(dev);
if (sdata->type == IEEE80211_IF_TYPE_MNTR &&
local->open_count > 1 &&
!(local->hw.flags & IEEE80211_HW_MONITOR_DURING_OPER)) {
/* remove "soft monitor" interface */
local->open_count--;
local->monitors--;
if (!local->monitors)
local->hw.conf.flags &= ~IEEE80211_CONF_RADIOTAP;
return 0;
}
netif_stop_queue(dev);
ieee80211_if_shutdown(dev);
if (sdata->type == IEEE80211_IF_TYPE_MNTR) {
local->monitors--;
if (!local->monitors)
local->hw.conf.flags &= ~IEEE80211_CONF_RADIOTAP;
}
local->open_count--;
if (local->open_count == 0) {
if (netif_running(local->mdev))
dev_close(local->mdev);
if (local->apdev)
dev_close(local->apdev);
if (local->ops->stop)
local->ops->stop(local_to_hw(local));
tasklet_disable(&local->tx_pending_tasklet);
tasklet_disable(&local->tasklet);
}
if (local->ops->remove_interface) {
struct ieee80211_if_init_conf conf;
conf.if_id = dev->ifindex;
conf.type = sdata->type;
conf.mac_addr = dev->dev_addr;
local->ops->remove_interface(local_to_hw(local), &conf);
}
ieee80211_start_hard_monitor(local);
return 0;
}
static int header_parse_80211(struct sk_buff *skb, unsigned char *haddr)
{
memcpy(haddr, skb_mac_header(skb) + 10, ETH_ALEN); /* addr2 */
return ETH_ALEN;
}
struct ieee80211_rate *
ieee80211_get_rate(struct ieee80211_local *local, int phymode, int hw_rate)
{
struct ieee80211_hw_mode *mode;
int r;
list_for_each_entry(mode, &local->modes_list, list) {
if (mode->mode != phymode)
continue;
for (r = 0; r < mode->num_rates; r++) {
struct ieee80211_rate *rate = &mode->rates[r];
if (rate->val == hw_rate ||
(rate->flags & IEEE80211_RATE_PREAMBLE2 &&
rate->val2 == hw_rate))
return rate;
}
}
return NULL;
}
static void
ieee80211_fill_frame_info(struct ieee80211_local *local,
struct ieee80211_frame_info *fi,
struct ieee80211_rx_status *status)
{
if (status) {
struct timespec ts;
struct ieee80211_rate *rate;
jiffies_to_timespec(jiffies, &ts);
fi->hosttime = cpu_to_be64((u64) ts.tv_sec * 1000000 +
ts.tv_nsec / 1000);
fi->mactime = cpu_to_be64(status->mactime);
switch (status->phymode) {
case MODE_IEEE80211A:
fi->phytype = htonl(ieee80211_phytype_ofdm_dot11_a);
break;
case MODE_IEEE80211B:
fi->phytype = htonl(ieee80211_phytype_dsss_dot11_b);
break;
case MODE_IEEE80211G:
fi->phytype = htonl(ieee80211_phytype_pbcc_dot11_g);
break;
case MODE_ATHEROS_TURBO:
fi->phytype =
htonl(ieee80211_phytype_dsss_dot11_turbo);
break;
default:
fi->phytype = htonl(0xAAAAAAAA);
break;
}
fi->channel = htonl(status->channel);
rate = ieee80211_get_rate(local, status->phymode,
status->rate);
if (rate) {
fi->datarate = htonl(rate->rate);
if (rate->flags & IEEE80211_RATE_PREAMBLE2) {
if (status->rate == rate->val)
fi->preamble = htonl(2); /* long */
else if (status->rate == rate->val2)
fi->preamble = htonl(1); /* short */
} else
fi->preamble = htonl(0);
} else {
fi->datarate = htonl(0);
fi->preamble = htonl(0);
}
fi->antenna = htonl(status->antenna);
fi->priority = htonl(0xffffffff); /* no clue */
fi->ssi_type = htonl(ieee80211_ssi_raw);
fi->ssi_signal = htonl(status->ssi);
fi->ssi_noise = 0x00000000;
fi->encoding = 0;
} else {
/* clear everything because we really don't know.
* the msg_type field isn't present on monitor frames
* so we don't know whether it will be present or not,
* but it's ok to not clear it since it'll be assigned
* anyway */
memset(fi, 0, sizeof(*fi) - sizeof(fi->msg_type));
fi->ssi_type = htonl(ieee80211_ssi_none);
}
fi->version = htonl(IEEE80211_FI_VERSION);
fi->length = cpu_to_be32(sizeof(*fi) - sizeof(fi->msg_type));
}
/* this routine is actually not just for this, but also
* for pushing fake 'management' frames into userspace.
* it shall be replaced by a netlink-based system. */
void
ieee80211_rx_mgmt(struct ieee80211_local *local, struct sk_buff *skb,
struct ieee80211_rx_status *status, u32 msg_type)
{
struct ieee80211_frame_info *fi;
const size_t hlen = sizeof(struct ieee80211_frame_info);
struct ieee80211_sub_if_data *sdata;
skb->dev = local->apdev;
sdata = IEEE80211_DEV_TO_SUB_IF(local->apdev);
if (skb_headroom(skb) < hlen) {
I802_DEBUG_INC(local->rx_expand_skb_head);
if (pskb_expand_head(skb, hlen, 0, GFP_ATOMIC)) {
dev_kfree_skb(skb);
return;
}
}
fi = (struct ieee80211_frame_info *) skb_push(skb, hlen);
ieee80211_fill_frame_info(local, fi, status);
fi->msg_type = htonl(msg_type);
sdata->stats.rx_packets++;
sdata->stats.rx_bytes += skb->len;
skb_set_mac_header(skb, 0);
skb->ip_summed = CHECKSUM_UNNECESSARY;
skb->pkt_type = PACKET_OTHERHOST;
skb->protocol = htons(ETH_P_802_2);
memset(skb->cb, 0, sizeof(skb->cb));
netif_rx(skb);
}
int ieee80211_radar_status(struct ieee80211_hw *hw, int channel,
int radar, int radar_type)
{
struct sk_buff *skb;
struct ieee80211_radar_info *msg;
struct ieee80211_local *local = hw_to_local(hw);
if (!local->apdev)
return 0;
skb = dev_alloc_skb(sizeof(struct ieee80211_frame_info) +
sizeof(struct ieee80211_radar_info));
if (!skb)
return -ENOMEM;
skb_reserve(skb, sizeof(struct ieee80211_frame_info));
msg = (struct ieee80211_radar_info *)
skb_put(skb, sizeof(struct ieee80211_radar_info));
msg->channel = channel;
msg->radar = radar;
msg->radar_type = radar_type;
ieee80211_rx_mgmt(local, skb, NULL, ieee80211_msg_radar);
return 0;
}
EXPORT_SYMBOL(ieee80211_radar_status);
static void ieee80211_stat_refresh(unsigned long data)
{
struct ieee80211_local *local = (struct ieee80211_local *) data;
struct sta_info *sta;
struct ieee80211_sub_if_data *sdata;
if (!local->stat_time)
return;
/* go through all stations */
spin_lock_bh(&local->sta_lock);
list_for_each_entry(sta, &local->sta_list, list) {
sta->channel_use = (sta->channel_use_raw / local->stat_time) /
CHAN_UTIL_PER_10MS;
sta->channel_use_raw = 0;
}
spin_unlock_bh(&local->sta_lock);
/* go through all subinterfaces */
read_lock(&local->sub_if_lock);
list_for_each_entry(sdata, &local->sub_if_list, list) {
sdata->channel_use = (sdata->channel_use_raw /
local->stat_time) / CHAN_UTIL_PER_10MS;
sdata->channel_use_raw = 0;
}
read_unlock(&local->sub_if_lock);
/* hardware interface */
local->channel_use = (local->channel_use_raw /
local->stat_time) / CHAN_UTIL_PER_10MS;
local->channel_use_raw = 0;
local->stat_timer.expires = jiffies + HZ * local->stat_time / 100;
add_timer(&local->stat_timer);
}
void ieee80211_tx_status_irqsafe(struct ieee80211_hw *hw,
struct sk_buff *skb,
struct ieee80211_tx_status *status)
{
struct ieee80211_local *local = hw_to_local(hw);
struct ieee80211_tx_status *saved;
int tmp;
skb->dev = local->mdev;
saved = kmalloc(sizeof(struct ieee80211_tx_status), GFP_ATOMIC);
if (unlikely(!saved)) {
if (net_ratelimit())
printk(KERN_WARNING "%s: Not enough memory, "
"dropping tx status", skb->dev->name);
/* should be dev_kfree_skb_irq, but due to this function being
* named _irqsafe instead of just _irq we can't be sure that
* people won't call it from non-irq contexts */
dev_kfree_skb_any(skb);
return;
}
memcpy(saved, status, sizeof(struct ieee80211_tx_status));
/* copy pointer to saved status into skb->cb for use by tasklet */
memcpy(skb->cb, &saved, sizeof(saved));
skb->pkt_type = IEEE80211_TX_STATUS_MSG;
skb_queue_tail(status->control.flags & IEEE80211_TXCTL_REQ_TX_STATUS ?
&local->skb_queue : &local->skb_queue_unreliable, skb);
tmp = skb_queue_len(&local->skb_queue) +
skb_queue_len(&local->skb_queue_unreliable);
while (tmp > IEEE80211_IRQSAFE_QUEUE_LIMIT &&
(skb = skb_dequeue(&local->skb_queue_unreliable))) {
memcpy(&saved, skb->cb, sizeof(saved));
kfree(saved);
dev_kfree_skb_irq(skb);
tmp--;
I802_DEBUG_INC(local->tx_status_drop);
}
tasklet_schedule(&local->tasklet);
}
EXPORT_SYMBOL(ieee80211_tx_status_irqsafe);
static void ieee80211_tasklet_handler(unsigned long data)
{
struct ieee80211_local *local = (struct ieee80211_local *) data;
struct sk_buff *skb;
struct ieee80211_rx_status rx_status;
struct ieee80211_tx_status *tx_status;
while ((skb = skb_dequeue(&local->skb_queue)) ||
(skb = skb_dequeue(&local->skb_queue_unreliable))) {
switch (skb->pkt_type) {
case IEEE80211_RX_MSG:
/* status is in skb->cb */
memcpy(&rx_status, skb->cb, sizeof(rx_status));
/* Clear skb->type in order to not confuse kernel
* netstack. */
skb->pkt_type = 0;
__ieee80211_rx(local_to_hw(local), skb, &rx_status);
break;
case IEEE80211_TX_STATUS_MSG:
/* get pointer to saved status out of skb->cb */
memcpy(&tx_status, skb->cb, sizeof(tx_status));
skb->pkt_type = 0;
ieee80211_tx_status(local_to_hw(local),
skb, tx_status);
kfree(tx_status);
break;
default: /* should never get here! */
printk(KERN_ERR "%s: Unknown message type (%d)\n",
local->mdev->name, skb->pkt_type);
dev_kfree_skb(skb);
break;
}
}
}
/* Remove added headers (e.g., QoS control), encryption header/MIC, etc. to
* make a prepared TX frame (one that has been given to hw) to look like brand
* new IEEE 802.11 frame that is ready to go through TX processing again.
* Also, tx_packet_data in cb is restored from tx_control. */
static void ieee80211_remove_tx_extra(struct ieee80211_local *local,
struct ieee80211_key *key,
struct sk_buff *skb,
struct ieee80211_tx_control *control)
{
int hdrlen, iv_len, mic_len;
struct ieee80211_tx_packet_data *pkt_data;
pkt_data = (struct ieee80211_tx_packet_data *)skb->cb;
pkt_data->ifindex = control->ifindex;
pkt_data->mgmt_iface = (control->type == IEEE80211_IF_TYPE_MGMT);
pkt_data->req_tx_status = !!(control->flags & IEEE80211_TXCTL_REQ_TX_STATUS);
pkt_data->do_not_encrypt = !!(control->flags & IEEE80211_TXCTL_DO_NOT_ENCRYPT);
pkt_data->requeue = !!(control->flags & IEEE80211_TXCTL_REQUEUE);
pkt_data->queue = control->queue;
hdrlen = ieee80211_get_hdrlen_from_skb(skb);
if (!key)
goto no_key;
switch (key->alg) {
case ALG_WEP:
iv_len = WEP_IV_LEN;
mic_len = WEP_ICV_LEN;
break;
case ALG_TKIP:
iv_len = TKIP_IV_LEN;
mic_len = TKIP_ICV_LEN;
break;
case ALG_CCMP:
iv_len = CCMP_HDR_LEN;
mic_len = CCMP_MIC_LEN;
break;
default:
goto no_key;
}
if (skb->len >= mic_len && key->force_sw_encrypt)
skb_trim(skb, skb->len - mic_len);
if (skb->len >= iv_len && skb->len > hdrlen) {
memmove(skb->data + iv_len, skb->data, hdrlen);
skb_pull(skb, iv_len);
}
no_key:
{
struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
u16 fc = le16_to_cpu(hdr->frame_control);
if ((fc & 0x8C) == 0x88) /* QoS Control Field */ {
fc &= ~IEEE80211_STYPE_QOS_DATA;
hdr->frame_control = cpu_to_le16(fc);
memmove(skb->data + 2, skb->data, hdrlen - 2);
skb_pull(skb, 2);
}
}
}
void ieee80211_tx_status(struct ieee80211_hw *hw, struct sk_buff *skb,
struct ieee80211_tx_status *status)
{
struct sk_buff *skb2;
struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
struct ieee80211_local *local = hw_to_local(hw);
u16 frag, type;
u32 msg_type;
struct ieee80211_tx_status_rtap_hdr *rthdr;
struct ieee80211_sub_if_data *sdata;
int monitors;
if (!status) {
printk(KERN_ERR
"%s: ieee80211_tx_status called with NULL status\n",
local->mdev->name);
dev_kfree_skb(skb);
return;
}
if (status->excessive_retries) {
struct sta_info *sta;
sta = sta_info_get(local, hdr->addr1);
if (sta) {
if (sta->flags & WLAN_STA_PS) {
/* The STA is in power save mode, so assume
* that this TX packet failed because of that.
*/
status->excessive_retries = 0;
status->flags |= IEEE80211_TX_STATUS_TX_FILTERED;
}
sta_info_put(sta);
}
}
if (status->flags & IEEE80211_TX_STATUS_TX_FILTERED) {
struct sta_info *sta;
sta = sta_info_get(local, hdr->addr1);
if (sta) {
sta->tx_filtered_count++;
/* Clear the TX filter mask for this STA when sending
* the next packet. If the STA went to power save mode,
* this will happen when it is waking up for the next
* time. */
sta->clear_dst_mask = 1;
/* TODO: Is the WLAN_STA_PS flag always set here or is
* the race between RX and TX status causing some
* packets to be filtered out before 80211.o gets an
* update for PS status? This seems to be the case, so
* no changes are likely to be needed. */
if (sta->flags & WLAN_STA_PS &&
skb_queue_len(&sta->tx_filtered) <
STA_MAX_TX_BUFFER) {
ieee80211_remove_tx_extra(local, sta->key,
skb,
&status->control);
skb_queue_tail(&sta->tx_filtered, skb);
} else if (!(sta->flags & WLAN_STA_PS) &&
!(status->control.flags & IEEE80211_TXCTL_REQUEUE)) {
/* Software retry the packet once */
status->control.flags |= IEEE80211_TXCTL_REQUEUE;
ieee80211_remove_tx_extra(local, sta->key,
skb,
&status->control);
dev_queue_xmit(skb);
} else {
if (net_ratelimit()) {
printk(KERN_DEBUG "%s: dropped TX "
"filtered frame queue_len=%d "
"PS=%d @%lu\n",
local->mdev->name,
skb_queue_len(
&sta->tx_filtered),
!!(sta->flags & WLAN_STA_PS),
jiffies);
}
dev_kfree_skb(skb);
}
sta_info_put(sta);
return;
}
} else {
/* FIXME: STUPID to call this with both local and local->mdev */
rate_control_tx_status(local, local->mdev, skb, status);
}
ieee80211_led_tx(local, 0);
/* SNMP counters
* Fragments are passed to low-level drivers as separate skbs, so these
* are actually fragments, not frames. Update frame counters only for
* the first fragment of the frame. */
frag = le16_to_cpu(hdr->seq_ctrl) & IEEE80211_SCTL_FRAG;
type = le16_to_cpu(hdr->frame_control) & IEEE80211_FCTL_FTYPE;
if (status->flags & IEEE80211_TX_STATUS_ACK) {
if (frag == 0) {
local->dot11TransmittedFrameCount++;
if (is_multicast_ether_addr(hdr->addr1))
local->dot11MulticastTransmittedFrameCount++;
if (status->retry_count > 0)
local->dot11RetryCount++;
if (status->retry_count > 1)
local->dot11MultipleRetryCount++;
}
/* This counter shall be incremented for an acknowledged MPDU
* with an individual address in the address 1 field or an MPDU
* with a multicast address in the address 1 field of type Data
* or Management. */
if (!is_multicast_ether_addr(hdr->addr1) ||
type == IEEE80211_FTYPE_DATA ||
type == IEEE80211_FTYPE_MGMT)
local->dot11TransmittedFragmentCount++;
} else {
if (frag == 0)
local->dot11FailedCount++;
}
msg_type = (status->flags & IEEE80211_TX_STATUS_ACK) ?
ieee80211_msg_tx_callback_ack : ieee80211_msg_tx_callback_fail;
/* this was a transmitted frame, but now we want to reuse it */
skb_orphan(skb);
if ((status->control.flags & IEEE80211_TXCTL_REQ_TX_STATUS) &&
local->apdev) {
if (local->monitors) {
skb2 = skb_clone(skb, GFP_ATOMIC);
} else {
skb2 = skb;
skb = NULL;
}
if (skb2)
/* Send frame to hostapd */
ieee80211_rx_mgmt(local, skb2, NULL, msg_type);
if (!skb)
return;
}
if (!local->monitors) {
dev_kfree_skb(skb);
return;
}
/* send frame to monitor interfaces now */
if (skb_headroom(skb) < sizeof(*rthdr)) {
printk(KERN_ERR "ieee80211_tx_status: headroom too small\n");
dev_kfree_skb(skb);
return;
}
rthdr = (struct ieee80211_tx_status_rtap_hdr*)
skb_push(skb, sizeof(*rthdr));
memset(rthdr, 0, sizeof(*rthdr));
rthdr->hdr.it_len = cpu_to_le16(sizeof(*rthdr));
rthdr->hdr.it_present =
cpu_to_le32((1 << IEEE80211_RADIOTAP_TX_FLAGS) |
(1 << IEEE80211_RADIOTAP_DATA_RETRIES));
if (!(status->flags & IEEE80211_TX_STATUS_ACK) &&
!is_multicast_ether_addr(hdr->addr1))
rthdr->tx_flags |= cpu_to_le16(IEEE80211_RADIOTAP_F_TX_FAIL);
if ((status->control.flags & IEEE80211_TXCTL_USE_RTS_CTS) &&
(status->control.flags & IEEE80211_TXCTL_USE_CTS_PROTECT))
rthdr->tx_flags |= cpu_to_le16(IEEE80211_RADIOTAP_F_TX_CTS);
else if (status->control.flags & IEEE80211_TXCTL_USE_RTS_CTS)
rthdr->tx_flags |= cpu_to_le16(IEEE80211_RADIOTAP_F_TX_RTS);
rthdr->data_retries = status->retry_count;
read_lock(&local->sub_if_lock);
monitors = local->monitors;
list_for_each_entry(sdata, &local->sub_if_list, list) {
/*
* Using the monitors counter is possibly racy, but
* if the value is wrong we simply either clone the skb
* once too much or forget sending it to one monitor iface
* The latter case isn't nice but fixing the race is much
* more complicated.
*/
if (!monitors || !skb)
goto out;
if (sdata->type == IEEE80211_IF_TYPE_MNTR) {
if (!netif_running(sdata->dev))
continue;
monitors--;
if (monitors)
skb2 = skb_clone(skb, GFP_KERNEL);
else
skb2 = NULL;
skb->dev = sdata->dev;
/* XXX: is this sufficient for BPF? */
skb_set_mac_header(skb, 0);
skb->ip_summed = CHECKSUM_UNNECESSARY;
skb->pkt_type = PACKET_OTHERHOST;
skb->protocol = htons(ETH_P_802_2);
memset(skb->cb, 0, sizeof(skb->cb));
netif_rx(skb);
skb = skb2;
}
}
out:
read_unlock(&local->sub_if_lock);
if (skb)
dev_kfree_skb(skb);
}
EXPORT_SYMBOL(ieee80211_tx_status);
int ieee80211_if_update_wds(struct net_device *dev, u8 *remote_addr)
{
struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
struct sta_info *sta;
if (compare_ether_addr(remote_addr, sdata->u.wds.remote_addr) == 0)
return 0;
/* Create STA entry for the new peer */
sta = sta_info_add(local, dev, remote_addr, GFP_KERNEL);
if (!sta)
return -ENOMEM;
sta_info_put(sta);
/* Remove STA entry for the old peer */
sta = sta_info_get(local, sdata->u.wds.remote_addr);
if (sta) {
sta_info_put(sta);
sta_info_free(sta, 0);
} else {
printk(KERN_DEBUG "%s: could not find STA entry for WDS link "
"peer " MAC_FMT "\n",
dev->name, MAC_ARG(sdata->u.wds.remote_addr));
}
/* Update WDS link data */
memcpy(&sdata->u.wds.remote_addr, remote_addr, ETH_ALEN);
return 0;
}
/* Must not be called for mdev and apdev */
void ieee80211_if_setup(struct net_device *dev)
{
ether_setup(dev);
dev->hard_start_xmit = ieee80211_subif_start_xmit;
dev->wireless_handlers = &ieee80211_iw_handler_def;
dev->set_multicast_list = ieee80211_set_multicast_list;
dev->change_mtu = ieee80211_change_mtu;
dev->get_stats = ieee80211_get_stats;
dev->open = ieee80211_open;
dev->stop = ieee80211_stop;
dev->uninit = ieee80211_if_reinit;
dev->destructor = ieee80211_if_free;
}
void ieee80211_if_mgmt_setup(struct net_device *dev)
{
ether_setup(dev);
dev->hard_start_xmit = ieee80211_mgmt_start_xmit;
dev->change_mtu = ieee80211_change_mtu_apdev;
dev->get_stats = ieee80211_get_stats;
dev->open = ieee80211_mgmt_open;
dev->stop = ieee80211_mgmt_stop;
dev->type = ARPHRD_IEEE80211_PRISM;
dev->hard_header_parse = header_parse_80211;
dev->uninit = ieee80211_if_reinit;
dev->destructor = ieee80211_if_free;
}
int ieee80211_init_rate_ctrl_alg(struct ieee80211_local *local,
const char *name)
{
struct rate_control_ref *ref, *old;
ASSERT_RTNL();
if (local->open_count || netif_running(local->mdev) ||
(local->apdev && netif_running(local->apdev)))
return -EBUSY;
ref = rate_control_alloc(name, local);
if (!ref) {
printk(KERN_WARNING "%s: Failed to select rate control "
"algorithm\n", local->mdev->name);
return -ENOENT;
}
old = local->rate_ctrl;
local->rate_ctrl = ref;
if (old) {
rate_control_put(old);
sta_info_flush(local, NULL);
}
printk(KERN_DEBUG "%s: Selected rate control "
"algorithm '%s'\n", local->mdev->name,
ref->ops->name);
return 0;
}
static void rate_control_deinitialize(struct ieee80211_local *local)
{
struct rate_control_ref *ref;
ref = local->rate_ctrl;
local->rate_ctrl = NULL;
rate_control_put(ref);
}
struct ieee80211_hw *ieee80211_alloc_hw(size_t priv_data_len,
const struct ieee80211_ops *ops)
{
struct net_device *mdev;
struct ieee80211_local *local;
struct ieee80211_sub_if_data *sdata;
int priv_size;
struct wiphy *wiphy;
/* Ensure 32-byte alignment of our private data and hw private data.
* We use the wiphy priv data for both our ieee80211_local and for
* the driver's private data
*
* In memory it'll be like this:
*
* +-------------------------+
* | struct wiphy |
* +-------------------------+
* | struct ieee80211_local |
* +-------------------------+
* | driver's private data |
* +-------------------------+
*
*/
priv_size = ((sizeof(struct ieee80211_local) +
NETDEV_ALIGN_CONST) & ~NETDEV_ALIGN_CONST) +
priv_data_len;
wiphy = wiphy_new(&mac80211_config_ops, priv_size);
if (!wiphy)
return NULL;
wiphy->privid = mac80211_wiphy_privid;
local = wiphy_priv(wiphy);
local->hw.wiphy = wiphy;
local->hw.priv = (char *)local +
((sizeof(struct ieee80211_local) +
NETDEV_ALIGN_CONST) & ~NETDEV_ALIGN_CONST);
BUG_ON(!ops->tx);
BUG_ON(!ops->config);
BUG_ON(!ops->add_interface);
local->ops = ops;
/* for now, mdev needs sub_if_data :/ */
mdev = alloc_netdev(sizeof(struct ieee80211_sub_if_data),
"wmaster%d", ether_setup);
if (!mdev) {
wiphy_free(wiphy);
return NULL;
}
sdata = IEEE80211_DEV_TO_SUB_IF(mdev);
mdev->ieee80211_ptr = &sdata->wdev;
sdata->wdev.wiphy = wiphy;
local->hw.queues = 1; /* default */
local->mdev = mdev;
local->rx_pre_handlers = ieee80211_rx_pre_handlers;
local->rx_handlers = ieee80211_rx_handlers;
local->tx_handlers = ieee80211_tx_handlers;
local->bridge_packets = 1;
local->rts_threshold = IEEE80211_MAX_RTS_THRESHOLD;
local->fragmentation_threshold = IEEE80211_MAX_FRAG_THRESHOLD;
local->short_retry_limit = 7;
local->long_retry_limit = 4;
local->hw.conf.radio_enabled = 1;
local->enabled_modes = (unsigned int) -1;
INIT_LIST_HEAD(&local->modes_list);
rwlock_init(&local->sub_if_lock);
INIT_LIST_HEAD(&local->sub_if_list);
INIT_DELAYED_WORK(&local->scan_work, ieee80211_sta_scan_work);
init_timer(&local->stat_timer);
local->stat_timer.function = ieee80211_stat_refresh;
local->stat_timer.data = (unsigned long) local;
ieee80211_rx_bss_list_init(mdev);
sta_info_init(local);
mdev->hard_start_xmit = ieee80211_master_start_xmit;
mdev->open = ieee80211_master_open;
mdev->stop = ieee80211_master_stop;
mdev->type = ARPHRD_IEEE80211;
mdev->hard_header_parse = header_parse_80211;
sdata->type = IEEE80211_IF_TYPE_AP;
sdata->dev = mdev;
sdata->local = local;
sdata->u.ap.force_unicast_rateidx = -1;
sdata->u.ap.max_ratectrl_rateidx = -1;
ieee80211_if_sdata_init(sdata);
list_add_tail(&sdata->list, &local->sub_if_list);
tasklet_init(&local->tx_pending_tasklet, ieee80211_tx_pending,
(unsigned long)local);
tasklet_disable(&local->tx_pending_tasklet);
tasklet_init(&local->tasklet,
ieee80211_tasklet_handler,
(unsigned long) local);
tasklet_disable(&local->tasklet);
skb_queue_head_init(&local->skb_queue);
skb_queue_head_init(&local->skb_queue_unreliable);
return local_to_hw(local);
}
EXPORT_SYMBOL(ieee80211_alloc_hw);
int ieee80211_register_hw(struct ieee80211_hw *hw)
{
struct ieee80211_local *local = hw_to_local(hw);
const char *name;
int result;
result = wiphy_register(local->hw.wiphy);
if (result < 0)
return result;
name = wiphy_dev(local->hw.wiphy)->driver->name;
local->hw.workqueue = create_singlethread_workqueue(name);
if (!local->hw.workqueue) {
result = -ENOMEM;
goto fail_workqueue;
}
/*
* The hardware needs headroom for sending the frame,
* and we need some headroom for passing the frame to monitor
* interfaces, but never both at the same time.
*/
local->tx_headroom = max_t(unsigned int , local->hw.extra_tx_headroom,
sizeof(struct ieee80211_tx_status_rtap_hdr));
debugfs_hw_add(local);
local->hw.conf.beacon_int = 1000;
local->wstats_flags |= local->hw.max_rssi ?
IW_QUAL_LEVEL_UPDATED : IW_QUAL_LEVEL_INVALID;
local->wstats_flags |= local->hw.max_signal ?
IW_QUAL_QUAL_UPDATED : IW_QUAL_QUAL_INVALID;
local->wstats_flags |= local->hw.max_noise ?
IW_QUAL_NOISE_UPDATED : IW_QUAL_NOISE_INVALID;
if (local->hw.max_rssi < 0 || local->hw.max_noise < 0)
local->wstats_flags |= IW_QUAL_DBM;
result = sta_info_start(local);
if (result < 0)
goto fail_sta_info;
rtnl_lock();
result = dev_alloc_name(local->mdev, local->mdev->name);
if (result < 0)
goto fail_dev;
memcpy(local->mdev->dev_addr, local->hw.wiphy->perm_addr, ETH_ALEN);
SET_NETDEV_DEV(local->mdev, wiphy_dev(local->hw.wiphy));
result = register_netdevice(local->mdev);
if (result < 0)
goto fail_dev;
ieee80211_debugfs_add_netdev(IEEE80211_DEV_TO_SUB_IF(local->mdev));
result = ieee80211_init_rate_ctrl_alg(local, NULL);
if (result < 0) {
printk(KERN_DEBUG "%s: Failed to initialize rate control "
"algorithm\n", local->mdev->name);
goto fail_rate;
}
result = ieee80211_wep_init(local);
if (result < 0) {
printk(KERN_DEBUG "%s: Failed to initialize wep\n",
local->mdev->name);
goto fail_wep;
}
ieee80211_install_qdisc(local->mdev);
/* add one default STA interface */
result = ieee80211_if_add(local->mdev, "wlan%d", NULL,
IEEE80211_IF_TYPE_STA);
if (result)
printk(KERN_WARNING "%s: Failed to add default virtual iface\n",
local->mdev->name);
local->reg_state = IEEE80211_DEV_REGISTERED;
rtnl_unlock();
ieee80211_led_init(local);
return 0;
fail_wep:
rate_control_deinitialize(local);
fail_rate:
ieee80211_debugfs_remove_netdev(IEEE80211_DEV_TO_SUB_IF(local->mdev));
unregister_netdevice(local->mdev);
fail_dev:
rtnl_unlock();
sta_info_stop(local);
fail_sta_info:
debugfs_hw_del(local);
destroy_workqueue(local->hw.workqueue);
fail_workqueue:
wiphy_unregister(local->hw.wiphy);
return result;
}
EXPORT_SYMBOL(ieee80211_register_hw);
int ieee80211_register_hwmode(struct ieee80211_hw *hw,
struct ieee80211_hw_mode *mode)
{
struct ieee80211_local *local = hw_to_local(hw);
struct ieee80211_rate *rate;
int i;
INIT_LIST_HEAD(&mode->list);
list_add_tail(&mode->list, &local->modes_list);
local->hw_modes |= (1 << mode->mode);
for (i = 0; i < mode->num_rates; i++) {
rate = &(mode->rates[i]);
rate->rate_inv = CHAN_UTIL_RATE_LCM / rate->rate;
}
ieee80211_prepare_rates(local, mode);
if (!local->oper_hw_mode) {
/* Default to this mode */
local->hw.conf.phymode = mode->mode;
local->oper_hw_mode = local->scan_hw_mode = mode;
local->oper_channel = local->scan_channel = &mode->channels[0];
local->hw.conf.mode = local->oper_hw_mode;
local->hw.conf.chan = local->oper_channel;
}
if (!(hw->flags & IEEE80211_HW_DEFAULT_REG_DOMAIN_CONFIGURED))
ieee80211_set_default_regdomain(mode);
return 0;
}
EXPORT_SYMBOL(ieee80211_register_hwmode);
void ieee80211_unregister_hw(struct ieee80211_hw *hw)
{
struct ieee80211_local *local = hw_to_local(hw);
struct ieee80211_sub_if_data *sdata, *tmp;
struct list_head tmp_list;
int i;
tasklet_kill(&local->tx_pending_tasklet);
tasklet_kill(&local->tasklet);
rtnl_lock();
BUG_ON(local->reg_state != IEEE80211_DEV_REGISTERED);
local->reg_state = IEEE80211_DEV_UNREGISTERED;
if (local->apdev)
ieee80211_if_del_mgmt(local);
write_lock_bh(&local->sub_if_lock);
list_replace_init(&local->sub_if_list, &tmp_list);
write_unlock_bh(&local->sub_if_lock);
list_for_each_entry_safe(sdata, tmp, &tmp_list, list)
__ieee80211_if_del(local, sdata);
rtnl_unlock();
if (local->stat_time)
del_timer_sync(&local->stat_timer);
ieee80211_rx_bss_list_deinit(local->mdev);
ieee80211_clear_tx_pending(local);
sta_info_stop(local);
rate_control_deinitialize(local);
debugfs_hw_del(local);
for (i = 0; i < NUM_IEEE80211_MODES; i++) {
kfree(local->supp_rates[i]);
kfree(local->basic_rates[i]);
}
if (skb_queue_len(&local->skb_queue)
|| skb_queue_len(&local->skb_queue_unreliable))
printk(KERN_WARNING "%s: skb_queue not empty\n",
local->mdev->name);
skb_queue_purge(&local->skb_queue);
skb_queue_purge(&local->skb_queue_unreliable);
destroy_workqueue(local->hw.workqueue);
wiphy_unregister(local->hw.wiphy);
ieee80211_wep_free(local);
ieee80211_led_exit(local);
}
EXPORT_SYMBOL(ieee80211_unregister_hw);
void ieee80211_free_hw(struct ieee80211_hw *hw)
{
struct ieee80211_local *local = hw_to_local(hw);
ieee80211_if_free(local->mdev);
wiphy_free(local->hw.wiphy);
}
EXPORT_SYMBOL(ieee80211_free_hw);
void ieee80211_wake_queue(struct ieee80211_hw *hw, int queue)
{
struct ieee80211_local *local = hw_to_local(hw);
if (test_and_clear_bit(IEEE80211_LINK_STATE_XOFF,
&local->state[queue])) {
if (test_bit(IEEE80211_LINK_STATE_PENDING,
&local->state[queue]))
tasklet_schedule(&local->tx_pending_tasklet);
else
if (!ieee80211_qdisc_installed(local->mdev)) {
if (queue == 0)
netif_wake_queue(local->mdev);
} else
__netif_schedule(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_qdisc_installed(local->mdev) && queue == 0)
netif_stop_queue(local->mdev);
set_bit(IEEE80211_LINK_STATE_XOFF, &local->state[queue]);
}
EXPORT_SYMBOL(ieee80211_stop_queue);
void ieee80211_start_queues(struct ieee80211_hw *hw)
{
struct ieee80211_local *local = hw_to_local(hw);
int i;
for (i = 0; i < local->hw.queues; i++)
clear_bit(IEEE80211_LINK_STATE_XOFF, &local->state[i]);
if (!ieee80211_qdisc_installed(local->mdev))
netif_start_queue(local->mdev);
}
EXPORT_SYMBOL(ieee80211_start_queues);
void ieee80211_stop_queues(struct ieee80211_hw *hw)
{
int i;
for (i = 0; i < hw->queues; 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; i++)
ieee80211_wake_queue(hw, i);
}
EXPORT_SYMBOL(ieee80211_wake_queues);
struct net_device_stats *ieee80211_dev_stats(struct net_device *dev)
{
struct ieee80211_sub_if_data *sdata;
sdata = IEEE80211_DEV_TO_SUB_IF(dev);
return &sdata->stats;
}
static int __init ieee80211_init(void)
{
struct sk_buff *skb;
int ret;
BUILD_BUG_ON(sizeof(struct ieee80211_tx_packet_data) > sizeof(skb->cb));
ret = ieee80211_wme_register();
if (ret) {
printk(KERN_DEBUG "ieee80211_init: failed to "
"initialize WME (err=%d)\n", ret);
return ret;
}
ieee80211_debugfs_netdev_init();
ieee80211_regdomain_init();
return 0;
}
static void __exit ieee80211_exit(void)
{
ieee80211_wme_unregister();
ieee80211_debugfs_netdev_exit();
}
subsys_initcall(ieee80211_init);
module_exit(ieee80211_exit);
MODULE_DESCRIPTION("IEEE 802.11 subsystem");
MODULE_LICENSE("GPL");
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