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linux/net/mac80211/work.c
Johannes Berg e5b900d228 mac80211: allow drivers to request DTIM period 
Some features require knowing the DTIM period
before associating. This implements the ability
to wait for a beacon in mac80211 before assoc
to provide this value. It is optional since
most likely not all drivers will need this.

Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
2010-07-29 12:55:00 -04:00

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/*
* 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 <linux/slab.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_MISMATCH,
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_add_ht_ie(struct sk_buff *skb, const u8 *ht_info_ie,
struct ieee80211_supported_band *sband,
struct ieee80211_channel *channel,
enum ieee80211_smps_mode smps)
{
struct ieee80211_ht_info *ht_info;
u8 *pos;
u32 flags = channel->flags;
u16 cap = sband->ht_cap.cap;
__le16 tmp;
if (!sband->ht_cap.ht_supported)
return;
if (!ht_info_ie)
return;
if (ht_info_ie[1] < sizeof(struct ieee80211_ht_info))
return;
ht_info = (struct ieee80211_ht_info *)(ht_info_ie + 2);
/* 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 (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);
}
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, qos_info;
const u8 *ies;
size_t offset = 0, noffset;
int i, len, count, rates_len, supp_rates_len;
u16 capab;
struct ieee80211_supported_band *sband;
u32 rates = 0;
sband = local->hw.wiphy->bands[wk->chan->band];
if (wk->assoc.supp_rates_len) {
/*
* 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);
} else {
/*
* In case AP not provide any supported rates information
* before association, we send information element(s) with
* all rates that we support.
*/
rates = ~0;
rates_len = sband->n_bitrates;
}
skb = alloc_skb(local->hw.extra_tx_headroom +
sizeof(*mgmt) + /* bit too much but doesn't matter */
2 + wk->assoc.ssid_len + /* SSID */
4 + rates_len + /* (extended) rates */
4 + /* power capability */
2 + 2 * sband->n_channels + /* supported channels */
2 + sizeof(struct ieee80211_ht_cap) + /* HT */
wk->ie_len + /* extra IEs */
9, /* WMM */
GFP_KERNEL);
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);
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;
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++ = wk->chan->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 present, add any custom IEs that go before HT */
if (wk->ie_len && wk->ie) {
static const u8 before_ht[] = {
WLAN_EID_SSID,
WLAN_EID_SUPP_RATES,
WLAN_EID_EXT_SUPP_RATES,
WLAN_EID_PWR_CAPABILITY,
WLAN_EID_SUPPORTED_CHANNELS,
WLAN_EID_RSN,
WLAN_EID_QOS_CAPA,
WLAN_EID_RRM_ENABLED_CAPABILITIES,
WLAN_EID_MOBILITY_DOMAIN,
WLAN_EID_SUPPORTED_REGULATORY_CLASSES,
};
noffset = ieee80211_ie_split(wk->ie, wk->ie_len,
before_ht, ARRAY_SIZE(before_ht),
offset);
pos = skb_put(skb, noffset - offset);
memcpy(pos, wk->ie + offset, noffset - offset);
offset = noffset;
}
if (wk->assoc.use_11n && wk->assoc.wmm_used &&
local->hw.queues >= 4)
ieee80211_add_ht_ie(skb, wk->assoc.ht_information_ie,
sband, wk->chan, wk->assoc.smps);
/* if present, add any custom non-vendor IEs that go after HT */
if (wk->ie_len && wk->ie) {
noffset = ieee80211_ie_split_vendor(wk->ie, wk->ie_len,
offset);
pos = skb_put(skb, noffset - offset);
memcpy(pos, wk->ie + offset, noffset - offset);
offset = noffset;
}
if (wk->assoc.wmm_used && local->hw.queues >= 4) {
if (wk->assoc.uapsd_used) {
qos_info = local->uapsd_queues;
qos_info |= (local->uapsd_max_sp_len <<
IEEE80211_WMM_IE_STA_QOSINFO_SP_SHIFT);
} else {
qos_info = 0;
}
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++ = qos_info;
}
/* add any remaining custom (i.e. vendor specific here) IEs */
if (wk->ie_len && wk->ie) {
noffset = wk->ie_len;
pos = skb_put(skb, noffset - offset);
memcpy(pos, wk->ie + offset, noffset - offset);
}
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 %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);
return WORK_ACT_TIMEOUT;
}
printk(KERN_DEBUG "%s: direct probe to %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 %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);
return WORK_ACT_TIMEOUT;
}
printk(KERN_DEBUG "%s: authenticate with %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 %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);
return WORK_ACT_TIMEOUT;
}
printk(KERN_DEBUG "%s: associate with %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 enum work_action __must_check
ieee80211_remain_on_channel_timeout(struct ieee80211_work *wk)
{
/*
* First time we run, do nothing -- the generic code will
* have switched to the right channel etc.
*/
if (!wk->started) {
wk->timeout = jiffies + msecs_to_jiffies(wk->remain.duration);
cfg80211_ready_on_channel(wk->sdata->dev, (unsigned long) wk,
wk->chan, wk->chan_type,
wk->remain.duration, GFP_KERNEL);
return WORK_ACT_NONE;
}
return WORK_ACT_TIMEOUT;
}
static enum work_action __must_check
ieee80211_assoc_beacon_wait(struct ieee80211_work *wk)
{
if (wk->started)
return WORK_ACT_TIMEOUT;
/*
* Wait up to one beacon interval ...
* should this be more if we miss one?
*/
printk(KERN_DEBUG "%s: waiting for beacon from %pM\n",
wk->sdata->name, wk->filter_ta);
wk->timeout = TU_TO_EXP_TIME(wk->assoc.bss->beacon_interval);
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_MISMATCH;
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;
if (wk->type != IEEE80211_WORK_ASSOC)
return WORK_ACT_MISMATCH;
/*
* 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: %pM rejected association temporarily; "
"comeback duration %u TU (%u ms)\n",
sdata->name, mgmt->sa, 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: %pM denied association (code=%d)\n",
sdata->name, mgmt->sa, 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);
if (wk->type != IEEE80211_WORK_DIRECT_PROBE)
return WORK_ACT_MISMATCH;
if (len < 24 + 12)
return WORK_ACT_NONE;
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 enum work_action __must_check
ieee80211_rx_mgmt_beacon(struct ieee80211_work *wk,
struct ieee80211_mgmt *mgmt, size_t len)
{
struct ieee80211_sub_if_data *sdata = wk->sdata;
struct ieee80211_local *local = sdata->local;
ASSERT_WORK_MTX(local);
if (wk->type != IEEE80211_WORK_ASSOC_BEACON_WAIT)
return WORK_ACT_MISMATCH;
if (len < 24 + 12)
return WORK_ACT_NONE;
printk(KERN_DEBUG "%s: beacon received\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:
case IEEE80211_WORK_ASSOC_BEACON_WAIT:
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_BEACON:
rma = ieee80211_rx_mgmt_beacon(wk, mgmt, skb->len);
break;
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);
rma = WORK_ACT_NONE;
}
/*
* We've either received an unexpected frame, or we have
* multiple work items and need to match the frame to the
* right one.
*/
if (rma == WORK_ACT_MISMATCH)
continue;
/*
* 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_MISMATCH:
/* ignore this unmatched frame */
break;
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->started = false; /* restart */
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;
bool remain_off_channel = false;
if (local->scanning)
return;
/*
* ieee80211_queue_work() should have picked up most cases,
* here we'll pick 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) {
bool started = wk->started;
/* mark work as started if it's on the current off-channel */
if (!started && local->tmp_channel &&
wk->chan == local->tmp_channel &&
wk->chan_type == local->tmp_channel_type) {
started = true;
wk->timeout = jiffies;
}
if (!started && !local->tmp_channel) {
/*
* TODO: could optimize this by leaving the
* station vifs in awake mode if they
* happen to be on the same channel as
* the requested channel
*/
ieee80211_offchannel_stop_beaconing(local);
ieee80211_offchannel_stop_station(local);
local->tmp_channel = wk->chan;
local->tmp_channel_type = wk->chan_type;
ieee80211_hw_config(local, 0);
started = true;
wk->timeout = jiffies;
}
/* don't try to work with items that aren't started */
if (!started)
continue;
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_ABORT:
rma = WORK_ACT_TIMEOUT;
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;
case IEEE80211_WORK_REMAIN_ON_CHANNEL:
rma = ieee80211_remain_on_channel_timeout(wk);
break;
case IEEE80211_WORK_ASSOC_BEACON_WAIT:
rma = ieee80211_assoc_beacon_wait(wk);
break;
}
wk->started = started;
switch (rma) {
case WORK_ACT_NONE:
/* might have changed the timeout */
run_again(local, wk->timeout);
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);
}
}
list_for_each_entry(wk, &local->work_list, list) {
if (!wk->started)
continue;
if (wk->chan != local->tmp_channel)
continue;
if (wk->chan_type != local->tmp_channel_type)
continue;
remain_off_channel = true;
}
if (!remain_off_channel && local->tmp_channel) {
local->tmp_channel = NULL;
ieee80211_hw_config(local, 0);
ieee80211_offchannel_return(local, true);
/* give connection some time to breathe */
run_again(local, jiffies + HZ/2);
}
mutex_lock(&local->scan_mtx);
if (list_empty(&local->work_list) && local->scan_req &&
!local->scanning)
ieee80211_queue_delayed_work(&local->hw,
&local->scan_work,
round_jiffies_relative(0));
mutex_unlock(&local->scan_mtx);
mutex_unlock(&local->work_mtx);
ieee80211_recalc_idle(local);
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;
if (WARN_ON(!ieee80211_sdata_running(wk->sdata)))
return;
wk->started = false;
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;
mutex_lock(&local->work_mtx);
list_for_each_entry(wk, &local->work_list, list) {
if (wk->sdata != sdata)
continue;
wk->type = IEEE80211_WORK_ABORT;
wk->started = true;
wk->timeout = jiffies;
}
mutex_unlock(&local->work_mtx);
/* run cleanups etc. */
ieee80211_work_work(&local->work_work);
mutex_lock(&local->work_mtx);
list_for_each_entry(wk, &local->work_list, list) {
if (wk->sdata != sdata)
continue;
WARN_ON(1);
break;
}
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_BEACON:
skb_queue_tail(&local->work_skb_queue, skb);
ieee80211_queue_work(&local->hw, &local->work_work);
return RX_QUEUED;
}
}
return RX_CONTINUE;
}
static enum work_done_result ieee80211_remain_done(struct ieee80211_work *wk,
struct sk_buff *skb)
{
/*
* We are done serving the remain-on-channel command.
*/
cfg80211_remain_on_channel_expired(wk->sdata->dev, (unsigned long) wk,
wk->chan, wk->chan_type,
GFP_KERNEL);
return WORK_DONE_DESTROY;
}
int ieee80211_wk_remain_on_channel(struct ieee80211_sub_if_data *sdata,
struct ieee80211_channel *chan,
enum nl80211_channel_type channel_type,
unsigned int duration, u64 *cookie)
{
struct ieee80211_work *wk;
wk = kzalloc(sizeof(*wk), GFP_KERNEL);
if (!wk)
return -ENOMEM;
wk->type = IEEE80211_WORK_REMAIN_ON_CHANNEL;
wk->chan = chan;
wk->chan_type = channel_type;
wk->sdata = sdata;
wk->done = ieee80211_remain_done;
wk->remain.duration = duration;
*cookie = (unsigned long) wk;
ieee80211_add_work(wk);
return 0;
}
int ieee80211_wk_cancel_remain_on_channel(struct ieee80211_sub_if_data *sdata,
u64 cookie)
{
struct ieee80211_local *local = sdata->local;
struct ieee80211_work *wk, *tmp;
bool found = false;
mutex_lock(&local->work_mtx);
list_for_each_entry_safe(wk, tmp, &local->work_list, list) {
if ((unsigned long) wk == cookie) {
wk->timeout = jiffies;
found = true;
break;
}
}
mutex_unlock(&local->work_mtx);
if (!found)
return -ENOENT;
ieee80211_queue_work(&local->hw, &local->work_work);
return 0;
}
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