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mac80211: generalise work handling 

In order to use auth/assoc for different purposes
other than MLME, it needs to be split up. For other
purposes, a generic work handling (potentially on
another channel) will be useful.

To achieve that, this patch moves much of the MLME
work handling out of mlme into a new work API. The
API can currently handle probing a specific AP,
authentication and association. The MLME previously
handled probe/authentication as one step and will
continue to do so, but they are separate in the new
work handling.

Work items are RCU-managed to be able to check for
existence of an item for a specific frame in the RX
path, but they can be re-used which the MLME right
now will do for its combined probe/auth step.

Signed-off-by: Johannes Berg <johannes@sipsolutions.net>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
This commit is contained in:
Johannes Berg 2009-12-23 13:15:35 +01:00 коммит произвёл John W. Linville
Родитель f679f65d41
Коммит af6b63741c
9 изменённых файлов: 1113 добавлений и 836 удалений
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2
net/mac80211/Makefile
Просмотреть файл

@ -9,7 +9,7 @@ mac80211-y := \
scan.o \
ht.o agg-tx.o agg-rx.o \
ibss.o \
mlme.o \
mlme.o work.o \
iface.o \
rate.o \
michael.o \

2
net/mac80211/debugfs_netdev.c
Просмотреть файл

@ -133,7 +133,6 @@ IEEE80211_IF_FILE(max_ratectrl_rateidx, max_ratectrl_rateidx, DEC);
/* STA attributes */
IEEE80211_IF_FILE(bssid, u.mgd.bssid, MAC);
IEEE80211_IF_FILE(aid, u.mgd.aid, DEC);
IEEE80211_IF_FILE(capab, u.mgd.capab, HEX);
static int ieee80211_set_smps(struct ieee80211_sub_if_data *sdata,
enum ieee80211_smps_mode smps_mode)
@ -270,7 +269,6 @@ static void add_sta_files(struct ieee80211_sub_if_data *sdata)
DEBUGFS_ADD(bssid, sta);
DEBUGFS_ADD(aid, sta);
DEBUGFS_ADD(capab, sta);
DEBUGFS_ADD_MODE(smps, 0600);
}

59
net/mac80211/ieee80211_i.h
Просмотреть файл

@ -228,41 +228,63 @@ struct mesh_preq_queue {
};
enum ieee80211_work_type {
IEEE80211_WORK_AUTH_PROBE,
IEEE80211_WORK_DIRECT_PROBE,
IEEE80211_WORK_AUTH,
IEEE80211_WORK_ASSOC,
};
/**
* enum work_done_result - indicates what to do after work was done
*
* @WORK_DONE_DESTROY: This work item is no longer needed, destroy.
* @WORK_DONE_REQUEUE: This work item was reset to be reused, and
* should be requeued.
*/
enum work_done_result {
WORK_DONE_DESTROY,
WORK_DONE_REQUEUE,
};
struct ieee80211_work {
struct list_head list;
struct rcu_head rcu_head;
struct ieee80211_sub_if_data *sdata;
enum work_done_result (*done)(struct ieee80211_work *wk,
struct sk_buff *skb);
struct ieee80211_channel *chan;
/* XXX: chan type? -- right now not really needed */
unsigned long timeout;
enum ieee80211_work_type type;
u8 filter_ta[ETH_ALEN];
union {
struct {
int tries;
u16 algorithm, transaction;
u8 ssid[IEEE80211_MAX_SSID_LEN];
u8 ssid_len;
u8 bssid[ETH_ALEN];
u8 key[WLAN_KEY_LEN_WEP104];
u8 key_len, key_idx;
bool privacy;
} auth;
} probe_auth;
struct {
struct ieee80211_bss *bss;
const u8 *supp_rates;
const u8 *ht_information_ie;
enum ieee80211_smps_mode smps;
int tries;
u16 capability;
u8 bssid[ETH_ALEN], prev_bssid[ETH_ALEN];
u8 prev_bssid[ETH_ALEN];
u8 ssid[IEEE80211_MAX_SSID_LEN];
u8 ssid_len;
u8 supp_rates_len;
bool wmm_used;
bool wmm_used, use_11n;
} assoc;
};
@ -276,17 +298,11 @@ enum ieee80211_sta_flags {
IEEE80211_STA_BEACON_POLL = BIT(0),
IEEE80211_STA_CONNECTION_POLL = BIT(1),
IEEE80211_STA_CONTROL_PORT = BIT(2),
IEEE80211_STA_WMM_ENABLED = BIT(3),
IEEE80211_STA_DISABLE_11N = BIT(4),
IEEE80211_STA_CSA_RECEIVED = BIT(5),
IEEE80211_STA_MFP_ENABLED = BIT(6),
};
/* flags for MLME request */
enum ieee80211_sta_request {
IEEE80211_STA_REQ_SCAN,
};
struct ieee80211_if_managed {
struct timer_list timer;
struct timer_list conn_mon_timer;
@ -302,12 +318,10 @@ struct ieee80211_if_managed {
struct mutex mtx;
struct ieee80211_bss *associated;
struct list_head work_list;
u8 bssid[ETH_ALEN];
u16 aid;
u16 capab;
struct sk_buff_head skb_queue;
@ -316,8 +330,6 @@ struct ieee80211_if_managed {
enum ieee80211_smps_mode req_smps, /* requested smps mode */
ap_smps; /* smps mode AP thinks we're in */
unsigned long request;
unsigned int flags;
u32 beacon_crc;
@ -583,6 +595,15 @@ struct ieee80211_local {
const struct ieee80211_ops *ops;
/*
* work stuff, potentially off-channel (in the future)
*/
struct mutex work_mtx;
struct list_head work_list;
struct timer_list work_timer;
struct work_struct work_work;
struct sk_buff_head work_skb_queue;
/*
* private workqueue to mac80211. mac80211 makes this accessible
* via ieee80211_queue_work()
@ -1127,6 +1148,14 @@ int __ieee80211_request_smps(struct ieee80211_sub_if_data *sdata,
void ieee80211_recalc_smps(struct ieee80211_local *local,
struct ieee80211_sub_if_data *forsdata);
/* internal work items */
void ieee80211_work_init(struct ieee80211_local *local);
void ieee80211_add_work(struct ieee80211_work *wk);
void free_work(struct ieee80211_work *wk);
void ieee80211_work_purge(struct ieee80211_sub_if_data *sdata);
ieee80211_rx_result ieee80211_work_rx_mgmt(struct ieee80211_sub_if_data *sdata,
struct sk_buff *skb);
#ifdef CONFIG_MAC80211_NOINLINE
#define debug_noinline noinline
#else

11
net/mac80211/iface.c
Просмотреть файл

@ -361,6 +361,11 @@ static int ieee80211_stop(struct net_device *dev)
*/
netif_stop_queue(dev);
/*
* Purge work for this interface.
*/
ieee80211_work_purge(sdata);
/*
* Now delete all active aggregation sessions.
*/
@ -928,6 +933,9 @@ u32 __ieee80211_recalc_idle(struct ieee80211_local *local)
struct ieee80211_sub_if_data *sdata;
int count = 0;
if (!list_empty(&local->work_list))
return ieee80211_idle_off(local, "working");
if (local->scanning)
return ieee80211_idle_off(local, "scanning");
@ -936,8 +944,7 @@ u32 __ieee80211_recalc_idle(struct ieee80211_local *local)
continue;
/* do not count disabled managed interfaces */
if (sdata->vif.type == NL80211_IFTYPE_STATION &&
!sdata->u.mgd.associated &&
list_empty(&sdata->u.mgd.work_list))
!sdata->u.mgd.associated)
continue;
/* do not count unused IBSS interfaces */
if (sdata->vif.type == NL80211_IFTYPE_ADHOC &&

2
net/mac80211/main.c
Просмотреть файл

@ -395,6 +395,8 @@ struct ieee80211_hw *ieee80211_alloc_hw(size_t priv_data_len,
INIT_DELAYED_WORK(&local->scan_work, ieee80211_scan_work);
ieee80211_work_init(local);
INIT_WORK(&local->restart_work, ieee80211_restart_work);
INIT_WORK(&local->reconfig_filter, ieee80211_reconfig_filter);

958
net/mac80211/mlme.c
Просмотреть файл

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5
net/mac80211/rx.c
Просмотреть файл

@ -1945,6 +1945,7 @@ ieee80211_rx_h_mgmt(struct ieee80211_rx_data *rx)
{
struct ieee80211_sub_if_data *sdata = rx->sdata;
struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
ieee80211_rx_result rxs;
if (!(rx->flags & IEEE80211_RX_RA_MATCH))
return RX_DROP_MONITOR;
@ -1952,6 +1953,10 @@ ieee80211_rx_h_mgmt(struct ieee80211_rx_data *rx)
if (ieee80211_drop_unencrypted(rx, mgmt->frame_control))
return RX_DROP_MONITOR;
rxs = ieee80211_work_rx_mgmt(rx->sdata, rx->skb);
if (rxs != RX_CONTINUE)
return rxs;
if (ieee80211_vif_is_mesh(&sdata->vif))
return ieee80211_mesh_rx_mgmt(sdata, rx->skb);

8
net/mac80211/scan.c
Просмотреть файл

@ -434,7 +434,6 @@ static int __ieee80211_start_scan(struct ieee80211_sub_if_data *sdata,
struct cfg80211_scan_request *req)
{
struct ieee80211_local *local = sdata->local;
struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
int rc;
if (local->scan_req)
@ -464,11 +463,8 @@ static int __ieee80211_start_scan(struct ieee80211_sub_if_data *sdata,
local->scan_req = req;
local->scan_sdata = sdata;
if (req != local->int_scan_req &&
sdata->vif.type == NL80211_IFTYPE_STATION &&
!list_empty(&ifmgd->work_list)) {
/* actually wait for the work it's doing to finish/time out */
set_bit(IEEE80211_STA_REQ_SCAN, &ifmgd->request);
if (!list_empty(&local->work_list)) {
/* wait for the work to finish/time out */
return 0;
}

902
net/mac80211/work.c Normal file
Просмотреть файл

@ -0,0 +1,902 @@
/*
* mac80211 work implementation
*
* Copyright 2003-2008, Jouni Malinen <j@w1.fi>
* Copyright 2004, Instant802 Networks, Inc.
* Copyright 2005, Devicescape Software, Inc.
* Copyright 2006-2007 Jiri Benc <jbenc@suse.cz>
* Copyright 2007, Michael Wu <flamingice@sourmilk.net>
* Copyright 2009, 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.
*/
#include <linux/delay.h>
#include <linux/if_ether.h>
#include <linux/skbuff.h>
#include <linux/if_arp.h>
#include <linux/etherdevice.h>
#include <linux/crc32.h>
#include <net/mac80211.h>
#include <asm/unaligned.h>
#include "ieee80211_i.h"
#include "rate.h"
#define IEEE80211_AUTH_TIMEOUT (HZ / 5)
#define IEEE80211_AUTH_MAX_TRIES 3
#define IEEE80211_ASSOC_TIMEOUT (HZ / 5)
#define IEEE80211_ASSOC_MAX_TRIES 3
#define IEEE80211_MAX_PROBE_TRIES 5
enum work_action {
WORK_ACT_NONE,
WORK_ACT_TIMEOUT,
WORK_ACT_DONE,
};
/* utils */
static inline void ASSERT_WORK_MTX(struct ieee80211_local *local)
{
WARN_ON(!mutex_is_locked(&local->work_mtx));
}
/*
* We can have multiple work items (and connection probing)
* scheduling this timer, but we need to take care to only
* reschedule it when it should fire _earlier_ than it was
* asked for before, or if it's not pending right now. This
* function ensures that. Note that it then is required to
* run this function for all timeouts after the first one
* has happened -- the work that runs from this timer will
* do that.
*/
static void run_again(struct ieee80211_local *local,
unsigned long timeout)
{
ASSERT_WORK_MTX(local);
if (!timer_pending(&local->work_timer) ||
time_before(timeout, local->work_timer.expires))
mod_timer(&local->work_timer, timeout);
}
static void work_free_rcu(struct rcu_head *head)
{
struct ieee80211_work *wk =
container_of(head, struct ieee80211_work, rcu_head);
kfree(wk);
}
void free_work(struct ieee80211_work *wk)
{
call_rcu(&wk->rcu_head, work_free_rcu);
}
static int ieee80211_compatible_rates(const u8 *supp_rates, int supp_rates_len,
struct ieee80211_supported_band *sband,
u32 *rates)
{
int i, j, count;
*rates = 0;
count = 0;
for (i = 0; i < supp_rates_len; i++) {
int rate = (supp_rates[i] & 0x7F) * 5;
for (j = 0; j < sband->n_bitrates; j++)
if (sband->bitrates[j].bitrate == rate) {
*rates |= BIT(j);
count++;
break;
}
}
return count;
}
/* frame sending functions */
static void ieee80211_send_assoc(struct ieee80211_sub_if_data *sdata,
struct ieee80211_work *wk)
{
struct ieee80211_local *local = sdata->local;
struct sk_buff *skb;
struct ieee80211_mgmt *mgmt;
u8 *pos;
const u8 *ies, *ht_ie;
int i, len, count, rates_len, supp_rates_len;
u16 capab;
struct ieee80211_supported_band *sband;
u32 rates = 0;
skb = dev_alloc_skb(local->hw.extra_tx_headroom +
sizeof(*mgmt) + 200 + wk->ie_len +
wk->assoc.ssid_len);
if (!skb) {
printk(KERN_DEBUG "%s: failed to allocate buffer for assoc "
"frame\n", sdata->name);
return;
}
skb_reserve(skb, local->hw.extra_tx_headroom);
sband = local->hw.wiphy->bands[wk->chan->band];
capab = WLAN_CAPABILITY_ESS;
if (sband->band == IEEE80211_BAND_2GHZ) {
if (!(local->hw.flags & IEEE80211_HW_2GHZ_SHORT_SLOT_INCAPABLE))
capab |= WLAN_CAPABILITY_SHORT_SLOT_TIME;
if (!(local->hw.flags & IEEE80211_HW_2GHZ_SHORT_PREAMBLE_INCAPABLE))
capab |= WLAN_CAPABILITY_SHORT_PREAMBLE;
}
if (wk->assoc.capability & WLAN_CAPABILITY_PRIVACY)
capab |= WLAN_CAPABILITY_PRIVACY;
/*
* Get all rates supported by the device and the AP as
* some APs don't like getting a superset of their rates
* in the association request (e.g. D-Link DAP 1353 in
* b-only mode)...
*/
rates_len = ieee80211_compatible_rates(wk->assoc.supp_rates,
wk->assoc.supp_rates_len,
sband, &rates);
if ((wk->assoc.capability & WLAN_CAPABILITY_SPECTRUM_MGMT) &&
(local->hw.flags & IEEE80211_HW_SPECTRUM_MGMT))
capab |= WLAN_CAPABILITY_SPECTRUM_MGMT;
mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
memset(mgmt, 0, 24);
memcpy(mgmt->da, wk->filter_ta, ETH_ALEN);
memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
memcpy(mgmt->bssid, wk->filter_ta, ETH_ALEN);
if (!is_zero_ether_addr(wk->assoc.prev_bssid)) {
skb_put(skb, 10);
mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
IEEE80211_STYPE_REASSOC_REQ);
mgmt->u.reassoc_req.capab_info = cpu_to_le16(capab);
mgmt->u.reassoc_req.listen_interval =
cpu_to_le16(local->hw.conf.listen_interval);
memcpy(mgmt->u.reassoc_req.current_ap, wk->assoc.prev_bssid,
ETH_ALEN);
} else {
skb_put(skb, 4);
mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
IEEE80211_STYPE_ASSOC_REQ);
mgmt->u.assoc_req.capab_info = cpu_to_le16(capab);
mgmt->u.assoc_req.listen_interval =
cpu_to_le16(local->hw.conf.listen_interval);
}
/* SSID */
ies = pos = skb_put(skb, 2 + wk->assoc.ssid_len);
*pos++ = WLAN_EID_SSID;
*pos++ = wk->assoc.ssid_len;
memcpy(pos, wk->assoc.ssid, wk->assoc.ssid_len);
/* add all rates which were marked to be used above */
supp_rates_len = rates_len;
if (supp_rates_len > 8)
supp_rates_len = 8;
len = sband->n_bitrates;
pos = skb_put(skb, supp_rates_len + 2);
*pos++ = WLAN_EID_SUPP_RATES;
*pos++ = supp_rates_len;
count = 0;
for (i = 0; i < sband->n_bitrates; i++) {
if (BIT(i) & rates) {
int rate = sband->bitrates[i].bitrate;
*pos++ = (u8) (rate / 5);
if (++count == 8)
break;
}
}
if (rates_len > count) {
pos = skb_put(skb, rates_len - count + 2);
*pos++ = WLAN_EID_EXT_SUPP_RATES;
*pos++ = rates_len - count;
for (i++; i < sband->n_bitrates; i++) {
if (BIT(i) & rates) {
int rate = sband->bitrates[i].bitrate;
*pos++ = (u8) (rate / 5);
}
}
}
if (capab & WLAN_CAPABILITY_SPECTRUM_MGMT) {
/* 1. power capabilities */
pos = skb_put(skb, 4);
*pos++ = WLAN_EID_PWR_CAPABILITY;
*pos++ = 2;
*pos++ = 0; /* min tx power */
*pos++ = local->hw.conf.channel->max_power; /* max tx power */
/* 2. supported channels */
/* TODO: get this in reg domain format */
pos = skb_put(skb, 2 * sband->n_channels + 2);
*pos++ = WLAN_EID_SUPPORTED_CHANNELS;
*pos++ = 2 * sband->n_channels;
for (i = 0; i < sband->n_channels; i++) {
*pos++ = ieee80211_frequency_to_channel(
sband->channels[i].center_freq);
*pos++ = 1; /* one channel in the subband*/
}
}
if (wk->ie_len && wk->ie) {
pos = skb_put(skb, wk->ie_len);
memcpy(pos, wk->ie, wk->ie_len);
}
if (wk->assoc.wmm_used && local->hw.queues >= 4) {
pos = skb_put(skb, 9);
*pos++ = WLAN_EID_VENDOR_SPECIFIC;
*pos++ = 7; /* len */
*pos++ = 0x00; /* Microsoft OUI 00:50:F2 */
*pos++ = 0x50;
*pos++ = 0xf2;
*pos++ = 2; /* WME */
*pos++ = 0; /* WME info */
*pos++ = 1; /* WME ver */
*pos++ = 0;
}
/* wmm support is a must to HT */
/*
* IEEE802.11n does not allow TKIP/WEP as pairwise
* ciphers in HT mode. We still associate in non-ht
* mode (11a/b/g) if any one of these ciphers is
* configured as pairwise.
*/
if (wk->assoc.use_11n && wk->assoc.wmm_used &&
(local->hw.queues >= 4) &&
sband->ht_cap.ht_supported &&
(ht_ie = wk->assoc.ht_information_ie) &&
ht_ie[1] >= sizeof(struct ieee80211_ht_info)) {
struct ieee80211_ht_info *ht_info =
(struct ieee80211_ht_info *)(ht_ie + 2);
u16 cap = sband->ht_cap.cap;
__le16 tmp;
u32 flags = local->hw.conf.channel->flags;
/* determine capability flags */
if (ieee80211_disable_40mhz_24ghz &&
sband->band == IEEE80211_BAND_2GHZ) {
cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
cap &= ~IEEE80211_HT_CAP_SGI_40;
}
switch (ht_info->ht_param & IEEE80211_HT_PARAM_CHA_SEC_OFFSET) {
case IEEE80211_HT_PARAM_CHA_SEC_ABOVE:
if (flags & IEEE80211_CHAN_NO_HT40PLUS) {
cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
cap &= ~IEEE80211_HT_CAP_SGI_40;
}
break;
case IEEE80211_HT_PARAM_CHA_SEC_BELOW:
if (flags & IEEE80211_CHAN_NO_HT40MINUS) {
cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
cap &= ~IEEE80211_HT_CAP_SGI_40;
}
break;
}
/* set SM PS mode properly */
cap &= ~IEEE80211_HT_CAP_SM_PS;
switch (wk->assoc.smps) {
case IEEE80211_SMPS_AUTOMATIC:
case IEEE80211_SMPS_NUM_MODES:
WARN_ON(1);
case IEEE80211_SMPS_OFF:
cap |= WLAN_HT_CAP_SM_PS_DISABLED <<
IEEE80211_HT_CAP_SM_PS_SHIFT;
break;
case IEEE80211_SMPS_STATIC:
cap |= WLAN_HT_CAP_SM_PS_STATIC <<
IEEE80211_HT_CAP_SM_PS_SHIFT;
break;
case IEEE80211_SMPS_DYNAMIC:
cap |= WLAN_HT_CAP_SM_PS_DYNAMIC <<
IEEE80211_HT_CAP_SM_PS_SHIFT;
break;
}
/* reserve and fill IE */
pos = skb_put(skb, sizeof(struct ieee80211_ht_cap) + 2);
*pos++ = WLAN_EID_HT_CAPABILITY;
*pos++ = sizeof(struct ieee80211_ht_cap);
memset(pos, 0, sizeof(struct ieee80211_ht_cap));
/* capability flags */
tmp = cpu_to_le16(cap);
memcpy(pos, &tmp, sizeof(u16));
pos += sizeof(u16);
/* AMPDU parameters */
*pos++ = sband->ht_cap.ampdu_factor |
(sband->ht_cap.ampdu_density <<
IEEE80211_HT_AMPDU_PARM_DENSITY_SHIFT);
/* MCS set */
memcpy(pos, &sband->ht_cap.mcs, sizeof(sband->ht_cap.mcs));
pos += sizeof(sband->ht_cap.mcs);
/* extended capabilities */
pos += sizeof(__le16);
/* BF capabilities */
pos += sizeof(__le32);
/* antenna selection */
pos += sizeof(u8);
}
IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
ieee80211_tx_skb(sdata, skb);
}
static void ieee80211_remove_auth_bss(struct ieee80211_local *local,
struct ieee80211_work *wk)
{
struct cfg80211_bss *cbss;
u16 capa_val = WLAN_CAPABILITY_ESS;
if (wk->probe_auth.privacy)
capa_val |= WLAN_CAPABILITY_PRIVACY;
cbss = cfg80211_get_bss(local->hw.wiphy, wk->chan, wk->filter_ta,
wk->probe_auth.ssid, wk->probe_auth.ssid_len,
WLAN_CAPABILITY_ESS | WLAN_CAPABILITY_PRIVACY,
capa_val);
if (!cbss)
return;
cfg80211_unlink_bss(local->hw.wiphy, cbss);
cfg80211_put_bss(cbss);
}
static enum work_action __must_check
ieee80211_direct_probe(struct ieee80211_work *wk)
{
struct ieee80211_sub_if_data *sdata = wk->sdata;
struct ieee80211_local *local = sdata->local;
wk->probe_auth.tries++;
if (wk->probe_auth.tries > IEEE80211_AUTH_MAX_TRIES) {
printk(KERN_DEBUG "%s: direct probe to AP %pM timed out\n",
sdata->name, wk->filter_ta);
/*
* Most likely AP is not in the range so remove the
* bss struct for that AP.
*/
ieee80211_remove_auth_bss(local, wk);
/*
* We might have a pending scan which had no chance to run yet
* due to work needing to be done. Hence, queue the STAs work
* again for that.
*/
ieee80211_queue_work(&local->hw, &local->work_work);
return WORK_ACT_TIMEOUT;
}
printk(KERN_DEBUG "%s: direct probe to AP %pM (try %d)\n",
sdata->name, wk->filter_ta, wk->probe_auth.tries);
/*
* Direct probe is sent to broadcast address as some APs
* will not answer to direct packet in unassociated state.
*/
ieee80211_send_probe_req(sdata, NULL, wk->probe_auth.ssid,
wk->probe_auth.ssid_len, NULL, 0);
wk->timeout = jiffies + IEEE80211_AUTH_TIMEOUT;
run_again(local, wk->timeout);
return WORK_ACT_NONE;
}
static enum work_action __must_check
ieee80211_authenticate(struct ieee80211_work *wk)
{
struct ieee80211_sub_if_data *sdata = wk->sdata;
struct ieee80211_local *local = sdata->local;
wk->probe_auth.tries++;
if (wk->probe_auth.tries > IEEE80211_AUTH_MAX_TRIES) {
printk(KERN_DEBUG "%s: authentication with AP %pM"
" timed out\n", sdata->name, wk->filter_ta);
/*
* Most likely AP is not in the range so remove the
* bss struct for that AP.
*/
ieee80211_remove_auth_bss(local, wk);
/*
* We might have a pending scan which had no chance to run yet
* due to work needing to be done. Hence, queue the STAs work
* again for that.
*/
ieee80211_queue_work(&local->hw, &local->work_work);
return WORK_ACT_TIMEOUT;
}
printk(KERN_DEBUG "%s: authenticate with AP %pM (try %d)\n",
sdata->name, wk->filter_ta, wk->probe_auth.tries);
ieee80211_send_auth(sdata, 1, wk->probe_auth.algorithm, wk->ie,
wk->ie_len, wk->filter_ta, NULL, 0, 0);
wk->probe_auth.transaction = 2;
wk->timeout = jiffies + IEEE80211_AUTH_TIMEOUT;
run_again(local, wk->timeout);
return WORK_ACT_NONE;
}
static enum work_action __must_check
ieee80211_associate(struct ieee80211_work *wk)
{
struct ieee80211_sub_if_data *sdata = wk->sdata;
struct ieee80211_local *local = sdata->local;
wk->assoc.tries++;
if (wk->assoc.tries > IEEE80211_ASSOC_MAX_TRIES) {
printk(KERN_DEBUG "%s: association with AP %pM"
" timed out\n",
sdata->name, wk->filter_ta);
/*
* Most likely AP is not in the range so remove the
* bss struct for that AP.
*/
if (wk->assoc.bss)
cfg80211_unlink_bss(local->hw.wiphy,
&wk->assoc.bss->cbss);
/*
* We might have a pending scan which had no chance to run yet
* due to work needing to be done. Hence, queue the STAs work
* again for that.
*/
ieee80211_queue_work(&local->hw, &local->work_work);
return WORK_ACT_TIMEOUT;
}
printk(KERN_DEBUG "%s: associate with AP %pM (try %d)\n",
sdata->name, wk->filter_ta, wk->assoc.tries);
ieee80211_send_assoc(sdata, wk);
wk->timeout = jiffies + IEEE80211_ASSOC_TIMEOUT;
run_again(local, wk->timeout);
return WORK_ACT_NONE;
}
static void ieee80211_auth_challenge(struct ieee80211_work *wk,
struct ieee80211_mgmt *mgmt,
size_t len)
{
struct ieee80211_sub_if_data *sdata = wk->sdata;
u8 *pos;
struct ieee802_11_elems elems;
pos = mgmt->u.auth.variable;
ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), &elems);
if (!elems.challenge)
return;
ieee80211_send_auth(sdata, 3, wk->probe_auth.algorithm,
elems.challenge - 2, elems.challenge_len + 2,
wk->filter_ta, wk->probe_auth.key,
wk->probe_auth.key_len, wk->probe_auth.key_idx);
wk->probe_auth.transaction = 4;
}
static enum work_action __must_check
ieee80211_rx_mgmt_auth(struct ieee80211_work *wk,
struct ieee80211_mgmt *mgmt, size_t len)
{
u16 auth_alg, auth_transaction, status_code;
if (wk->type != IEEE80211_WORK_AUTH)
return WORK_ACT_NONE;
if (len < 24 + 6)
return WORK_ACT_NONE;
auth_alg = le16_to_cpu(mgmt->u.auth.auth_alg);
auth_transaction = le16_to_cpu(mgmt->u.auth.auth_transaction);
status_code = le16_to_cpu(mgmt->u.auth.status_code);
if (auth_alg != wk->probe_auth.algorithm ||
auth_transaction != wk->probe_auth.transaction)
return WORK_ACT_NONE;
if (status_code != WLAN_STATUS_SUCCESS) {
printk(KERN_DEBUG "%s: %pM denied authentication (status %d)\n",
wk->sdata->name, mgmt->sa, status_code);
return WORK_ACT_DONE;
}
switch (wk->probe_auth.algorithm) {
case WLAN_AUTH_OPEN:
case WLAN_AUTH_LEAP:
case WLAN_AUTH_FT:
break;
case WLAN_AUTH_SHARED_KEY:
if (wk->probe_auth.transaction != 4) {
ieee80211_auth_challenge(wk, mgmt, len);
/* need another frame */
return WORK_ACT_NONE;
}
break;
default:
WARN_ON(1);
return WORK_ACT_NONE;
}
printk(KERN_DEBUG "%s: authenticated\n", wk->sdata->name);
return WORK_ACT_DONE;
}
static enum work_action __must_check
ieee80211_rx_mgmt_assoc_resp(struct ieee80211_work *wk,
struct ieee80211_mgmt *mgmt, size_t len,
bool reassoc)
{
struct ieee80211_sub_if_data *sdata = wk->sdata;
struct ieee80211_local *local = sdata->local;
u16 capab_info, status_code, aid;
struct ieee802_11_elems elems;
u8 *pos;
/*
* AssocResp and ReassocResp have identical structure, so process both
* of them in this function.
*/
if (len < 24 + 6)
return WORK_ACT_NONE;
capab_info = le16_to_cpu(mgmt->u.assoc_resp.capab_info);
status_code = le16_to_cpu(mgmt->u.assoc_resp.status_code);
aid = le16_to_cpu(mgmt->u.assoc_resp.aid);
printk(KERN_DEBUG "%s: RX %sssocResp from %pM (capab=0x%x "
"status=%d aid=%d)\n",
sdata->name, reassoc ? "Rea" : "A", mgmt->sa,
capab_info, status_code, (u16)(aid & ~(BIT(15) | BIT(14))));
pos = mgmt->u.assoc_resp.variable;
ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), &elems);
if (status_code == WLAN_STATUS_ASSOC_REJECTED_TEMPORARILY &&
elems.timeout_int && elems.timeout_int_len == 5 &&
elems.timeout_int[0] == WLAN_TIMEOUT_ASSOC_COMEBACK) {
u32 tu, ms;
tu = get_unaligned_le32(elems.timeout_int + 1);
ms = tu * 1024 / 1000;
printk(KERN_DEBUG "%s: AP rejected association temporarily; "
"comeback duration %u TU (%u ms)\n",
sdata->name, tu, ms);
wk->timeout = jiffies + msecs_to_jiffies(ms);
if (ms > IEEE80211_ASSOC_TIMEOUT)
run_again(local, wk->timeout);
return WORK_ACT_NONE;
}
if (status_code != WLAN_STATUS_SUCCESS)
printk(KERN_DEBUG "%s: AP denied association (code=%d)\n",
sdata->name, status_code);
else
printk(KERN_DEBUG "%s: associated\n", sdata->name);
return WORK_ACT_DONE;
}
static enum work_action __must_check
ieee80211_rx_mgmt_probe_resp(struct ieee80211_work *wk,
struct ieee80211_mgmt *mgmt, size_t len,
struct ieee80211_rx_status *rx_status)
{
struct ieee80211_sub_if_data *sdata = wk->sdata;
struct ieee80211_local *local = sdata->local;
size_t baselen;
ASSERT_WORK_MTX(local);
baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt;
if (baselen > len)
return WORK_ACT_NONE;
printk(KERN_DEBUG "%s: direct probe responded\n", sdata->name);
return WORK_ACT_DONE;
}
static void ieee80211_work_rx_queued_mgmt(struct ieee80211_local *local,
struct sk_buff *skb)
{
struct ieee80211_rx_status *rx_status;
struct ieee80211_mgmt *mgmt;
struct ieee80211_work *wk;
enum work_action rma = WORK_ACT_NONE;
u16 fc;
rx_status = (struct ieee80211_rx_status *) skb->cb;
mgmt = (struct ieee80211_mgmt *) skb->data;
fc = le16_to_cpu(mgmt->frame_control);
mutex_lock(&local->work_mtx);
list_for_each_entry(wk, &local->work_list, list) {
const u8 *bssid = NULL;
switch (wk->type) {
case IEEE80211_WORK_DIRECT_PROBE:
case IEEE80211_WORK_AUTH:
case IEEE80211_WORK_ASSOC:
bssid = wk->filter_ta;
break;
default:
continue;
}
/*
* Before queuing, we already verified mgmt->sa,
* so this is needed just for matching.
*/
if (compare_ether_addr(bssid, mgmt->bssid))
continue;
switch (fc & IEEE80211_FCTL_STYPE) {
case IEEE80211_STYPE_PROBE_RESP:
rma = ieee80211_rx_mgmt_probe_resp(wk, mgmt, skb->len,
rx_status);
break;
case IEEE80211_STYPE_AUTH:
rma = ieee80211_rx_mgmt_auth(wk, mgmt, skb->len);
break;
case IEEE80211_STYPE_ASSOC_RESP:
rma = ieee80211_rx_mgmt_assoc_resp(wk, mgmt,
skb->len, false);
break;
case IEEE80211_STYPE_REASSOC_RESP:
rma = ieee80211_rx_mgmt_assoc_resp(wk, mgmt,
skb->len, true);
break;
default:
WARN_ON(1);
}
/*
* We've processed this frame for that work, so it can't
* belong to another work struct.
* NB: this is also required for correctness for 'rma'!
*/
break;
}
switch (rma) {
case WORK_ACT_NONE:
break;
case WORK_ACT_DONE:
list_del_rcu(&wk->list);
break;
default:
WARN(1, "unexpected: %d", rma);
}
mutex_unlock(&local->work_mtx);
if (rma != WORK_ACT_DONE)
goto out;
switch (wk->done(wk, skb)) {
case WORK_DONE_DESTROY:
free_work(wk);
break;
case WORK_DONE_REQUEUE:
synchronize_rcu();
wk->timeout = jiffies; /* run again directly */
mutex_lock(&local->work_mtx);
list_add_tail(&wk->list, &local->work_list);
mutex_unlock(&local->work_mtx);
}
out:
kfree_skb(skb);
}
static void ieee80211_work_timer(unsigned long data)
{
struct ieee80211_local *local = (void *) data;
if (local->quiescing)
return;
ieee80211_queue_work(&local->hw, &local->work_work);
}
static void ieee80211_work_work(struct work_struct *work)
{
struct ieee80211_local *local =
container_of(work, struct ieee80211_local, work_work);
struct sk_buff *skb;
struct ieee80211_work *wk, *tmp;
LIST_HEAD(free_work);
enum work_action rma;
if (local->scanning)
return;
/*
* ieee80211_queue_work() should have picked up most cases,
* here we'll pick the the rest.
*/
if (WARN(local->suspended, "work scheduled while going to suspend\n"))
return;
/* first process frames to avoid timing out while a frame is pending */
while ((skb = skb_dequeue(&local->work_skb_queue)))
ieee80211_work_rx_queued_mgmt(local, skb);
ieee80211_recalc_idle(local);
mutex_lock(&local->work_mtx);
list_for_each_entry_safe(wk, tmp, &local->work_list, list) {
if (time_is_after_jiffies(wk->timeout)) {
/*
* This work item isn't supposed to be worked on
* right now, but take care to adjust the timer
* properly.
*/
run_again(local, wk->timeout);
continue;
}
switch (wk->type) {
default:
WARN_ON(1);
/* nothing */
rma = WORK_ACT_NONE;
break;
case IEEE80211_WORK_DIRECT_PROBE:
rma = ieee80211_direct_probe(wk);
break;
case IEEE80211_WORK_AUTH:
rma = ieee80211_authenticate(wk);
break;
case IEEE80211_WORK_ASSOC:
rma = ieee80211_associate(wk);
break;
}
switch (rma) {
case WORK_ACT_NONE:
/* no action required */
break;
case WORK_ACT_TIMEOUT:
list_del_rcu(&wk->list);
synchronize_rcu();
list_add(&wk->list, &free_work);
break;
default:
WARN(1, "unexpected: %d", rma);
}
}
if (list_empty(&local->work_list) && local->scan_req)
ieee80211_queue_delayed_work(&local->hw,
&local->scan_work,
round_jiffies_relative(0));
mutex_unlock(&local->work_mtx);
list_for_each_entry_safe(wk, tmp, &free_work, list) {
wk->done(wk, NULL);
list_del(&wk->list);
kfree(wk);
}
}
void ieee80211_add_work(struct ieee80211_work *wk)
{
struct ieee80211_local *local;
if (WARN_ON(!wk->chan))
return;
if (WARN_ON(!wk->sdata))
return;
if (WARN_ON(!wk->done))
return;
wk->timeout = jiffies;
local = wk->sdata->local;
mutex_lock(&local->work_mtx);
list_add_tail(&wk->list, &local->work_list);
mutex_unlock(&local->work_mtx);
ieee80211_queue_work(&local->hw, &local->work_work);
}
void ieee80211_work_init(struct ieee80211_local *local)
{
mutex_init(&local->work_mtx);
INIT_LIST_HEAD(&local->work_list);
setup_timer(&local->work_timer, ieee80211_work_timer,
(unsigned long)local);
INIT_WORK(&local->work_work, ieee80211_work_work);
skb_queue_head_init(&local->work_skb_queue);
}
void ieee80211_work_purge(struct ieee80211_sub_if_data *sdata)
{
struct ieee80211_local *local = sdata->local;
struct ieee80211_work *wk, *tmp;
mutex_lock(&local->work_mtx);
list_for_each_entry_safe(wk, tmp, &local->work_list, list) {
if (wk->sdata != sdata)
continue;
list_del(&wk->list);
free_work(wk);
}
mutex_unlock(&local->work_mtx);
}
ieee80211_rx_result ieee80211_work_rx_mgmt(struct ieee80211_sub_if_data *sdata,
struct sk_buff *skb)
{
struct ieee80211_local *local = sdata->local;
struct ieee80211_mgmt *mgmt;
struct ieee80211_work *wk;
u16 fc;
if (skb->len < 24)
return RX_DROP_MONITOR;
mgmt = (struct ieee80211_mgmt *) skb->data;
fc = le16_to_cpu(mgmt->frame_control);
list_for_each_entry_rcu(wk, &local->work_list, list) {
if (sdata != wk->sdata)
continue;
if (compare_ether_addr(wk->filter_ta, mgmt->sa))
continue;
if (compare_ether_addr(wk->filter_ta, mgmt->bssid))
continue;
switch (fc & IEEE80211_FCTL_STYPE) {
case IEEE80211_STYPE_AUTH:
case IEEE80211_STYPE_PROBE_RESP:
case IEEE80211_STYPE_ASSOC_RESP:
case IEEE80211_STYPE_REASSOC_RESP:
case IEEE80211_STYPE_DEAUTH:
case IEEE80211_STYPE_DISASSOC:
skb_queue_tail(&local->work_skb_queue, skb);
ieee80211_queue_work(&local->hw, &local->work_work);
return RX_QUEUED;
}
}
return RX_CONTINUE;
}