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alistair23-linux/net/mac80211/work.c
Johannes Berg b2abb6e2bc mac80211: sync driver before TX 
In P2P client mode, the GO (AP) to connect to might
have periods of time where it is not available due
to powersave. To allow the driver to sync with it
and send frames to the GO only when it is available
add a new callback tx_sync (and the corresponding
finish_tx_sync). These callbacks can sleep unlike
the actual TX.

Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
2011-07-20 15:04:35 -04:00

1304 lines
33 KiB
C
Raw Blame History

/*
* 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"
#include "driver-ops.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
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)
{
lockdep_assert_held(&local->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);
}
void free_work(struct ieee80211_work *wk)
{
kfree_rcu(wk, rcu_head);
}
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 */
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;
size_t offset = 0, noffset;
int i, 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 */
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;
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;
if (!wk->probe_auth.synced) {
int ret = drv_tx_sync(local, sdata, wk->filter_ta,
IEEE80211_TX_SYNC_AUTH);
if (ret)
return WORK_ACT_TIMEOUT;
}
wk->probe_auth.synced = true;
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/%i)\n",
sdata->name, wk->filter_ta, wk->probe_auth.tries,
IEEE80211_AUTH_MAX_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,
(u32) -1, true);
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;
if (!wk->probe_auth.synced) {
int ret = drv_tx_sync(local, sdata, wk->filter_ta,
IEEE80211_TX_SYNC_AUTH);
if (ret)
return WORK_ACT_TIMEOUT;
}
wk->probe_auth.synced = true;
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;
if (!wk->assoc.synced) {
int ret = drv_tx_sync(local, sdata, wk->filter_ta,
IEEE80211_TX_SYNC_ASSOC);
if (ret)
return WORK_ACT_TIMEOUT;
}
wk->assoc.synced = true;
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_offchannel_tx(struct ieee80211_work *wk)
{
if (!wk->started) {
wk->timeout = jiffies + msecs_to_jiffies(wk->offchan_tx.wait);
/*
* After this, offchan_tx.frame remains but now is no
* longer a valid pointer -- we still need it as the
* cookie for canceling this work.
*/
ieee80211_tx_skb(wk->sdata, wk->offchan_tx.frame);
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->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->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->mtx);
list_add_tail(&wk->list, &local->work_list);
mutex_unlock(&local->mtx);
}
out:
kfree_skb(skb);
}
static bool ieee80211_work_ct_coexists(enum nl80211_channel_type wk_ct,
enum nl80211_channel_type oper_ct)
{
switch (wk_ct) {
case NL80211_CHAN_NO_HT:
return true;
case NL80211_CHAN_HT20:
if (oper_ct != NL80211_CHAN_NO_HT)
return true;
return false;
case NL80211_CHAN_HT40MINUS:
case NL80211_CHAN_HT40PLUS:
return (wk_ct == oper_ct);
}
WARN_ON(1); /* shouldn't get here */
return false;
}
static enum nl80211_channel_type
ieee80211_calc_ct(enum nl80211_channel_type wk_ct,
enum nl80211_channel_type oper_ct)
{
switch (wk_ct) {
case NL80211_CHAN_NO_HT:
return oper_ct;
case NL80211_CHAN_HT20:
if (oper_ct != NL80211_CHAN_NO_HT)
return oper_ct;
return wk_ct;
case NL80211_CHAN_HT40MINUS:
case NL80211_CHAN_HT40PLUS:
return wk_ct;
}
WARN_ON(1); /* shouldn't get here */
return wk_ct;
}
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);
mutex_lock(&local->mtx);
ieee80211_recalc_idle(local);
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) {
bool on_oper_chan;
bool tmp_chan_changed = false;
bool on_oper_chan2;
enum nl80211_channel_type wk_ct;
on_oper_chan = ieee80211_cfg_on_oper_channel(local);
/* Work with existing channel type if possible. */
wk_ct = wk->chan_type;
if (wk->chan == local->hw.conf.channel)
wk_ct = ieee80211_calc_ct(wk->chan_type,
local->hw.conf.channel_type);
if (local->tmp_channel)
if ((local->tmp_channel != wk->chan) ||
(local->tmp_channel_type != wk_ct))
tmp_chan_changed = true;
local->tmp_channel = wk->chan;
local->tmp_channel_type = wk_ct;
/*
* Leave the station vifs in awake mode if they
* happen to be on the same channel as
* the requested channel.
*/
on_oper_chan2 = ieee80211_cfg_on_oper_channel(local);
if (on_oper_chan != on_oper_chan2) {
if (on_oper_chan2) {
/* going off oper channel, PS too */
ieee80211_offchannel_stop_vifs(local,
true);
ieee80211_hw_config(local, 0);
} else {
/* going on channel, but leave PS
* off-channel. */
ieee80211_hw_config(local, 0);
ieee80211_offchannel_return(local,
true,
false);
}
} else if (tmp_chan_changed)
/* Still off-channel, but on some other
* channel, so update hardware.
* PS should already be off-channel.
*/
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_OFFCHANNEL_TX:
rma = ieee80211_offchannel_tx(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 (ieee80211_work_ct_coexists(wk->chan_type,
local->tmp_channel_type))
continue;
remain_off_channel = true;
}
if (!remain_off_channel && local->tmp_channel) {
bool on_oper_chan = ieee80211_cfg_on_oper_channel(local);
local->tmp_channel = NULL;
/* If tmp_channel wasn't operating channel, then
* we need to go back on-channel.
* NOTE: If we can ever be here while scannning,
* or if the hw_config() channel config logic changes,
* then we may need to do a more thorough check to see if
* we still need to do a hardware config. Currently,
* we cannot be here while scanning, however.
*/
if (ieee80211_cfg_on_oper_channel(local) && !on_oper_chan)
ieee80211_hw_config(local, 0);
/* At the least, we need to disable offchannel_ps,
* so just go ahead and run the entire offchannel
* return logic here. We *could* skip enabling
* beaconing if we were already on-oper-channel
* as a future optimization.
*/
ieee80211_offchannel_return(local, true, true);
/* give connection some time to breathe */
run_again(local, jiffies + HZ/2);
}
if (list_empty(&local->work_list) && local->scan_req &&
!local->scanning)
ieee80211_queue_delayed_work(&local->hw,
&local->scan_work,
round_jiffies_relative(0));
ieee80211_recalc_idle(local);
mutex_unlock(&local->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;
if (WARN_ON(!ieee80211_sdata_running(wk->sdata)))
return;
wk->started = false;
local = wk->sdata->local;
mutex_lock(&local->mtx);
list_add_tail(&wk->list, &local->work_list);
mutex_unlock(&local->mtx);
ieee80211_queue_work(&local->hw, &local->work_work);
}
void ieee80211_work_init(struct ieee80211_local *local)
{
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;
bool cleanup = false;
mutex_lock(&local->mtx);
list_for_each_entry(wk, &local->work_list, list) {
if (wk->sdata != sdata)
continue;
cleanup = true;
wk->type = IEEE80211_WORK_ABORT;
wk->started = true;
wk->timeout = jiffies;
}
mutex_unlock(&local->mtx);
/* run cleanups etc. */
if (cleanup)
ieee80211_work_work(&local->work_work);
mutex_lock(&local->mtx);
list_for_each_entry(wk, &local->work_list, list) {
if (wk->sdata != sdata)
continue;
WARN_ON(1);
break;
}
mutex_unlock(&local->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->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->mtx);
if (!found)
return -ENOENT;
ieee80211_queue_work(&local->hw, &local->work_work);
return 0;
}
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