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linux/net/mac80211/rx.c
Paul Stewart 3117bbdb78 mac80211: Don't let regulatory make us deaf 
When regulatory information changes our HT behavior (e.g,
when we get a country code from the AP we have just associated
with), we should use this information to change the power with
which we transmit, and what channels we transmit.  Sometimes
the channel parameters we derive from regulatory information
contradicts the parameters we used in association.  For example,
we could have associated specifying HT40, but the regulatory
rules we apply may forbid HT40 operation.

In the situation above, we should reconfigure ourselves to
transmit in HT20 only, however it makes no sense for us to
disable receive in HT40, since if we associated with these
parameters, the AP has every reason to expect we can and
will receive packets this way.  The code in mac80211 does
not have the capability of sending the appropriate action
frames to signal a change in HT behaviour so the AP has
no clue we can no longer receive frames encoded this way.
In some broken AP implementations, this can leave us
effectively deaf if the AP never retries in lower HT rates.

This change breaks up the channel_type parameter in the
ieee80211_enable_ht function into a separate receive and
transmit part.  It honors the channel flags set by regulatory
in order to configure the rate control algorithm, but uses
the capability flags to configure the channel on the radio,
since these were used in association to set the AP's transmit
rate.

Signed-off-by: Paul Stewart <pstew@chromium.org>
Cc: Sam Leffler <sleffler@chromium.org>
Cc: Johannes Berg <johannes@sipsolutions.net>
Reviewed-by: Luis R Rodriguez <mcgrof@frijolero.org>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
2012-03-13 14:55:53 -04:00

3123 lines
86 KiB
C
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/*
* Copyright 2002-2005, Instant802 Networks, Inc.
* Copyright 2005-2006, Devicescape Software, Inc.
* Copyright 2006-2007 Jiri Benc <jbenc@suse.cz>
* Copyright 2007-2010 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/jiffies.h>
#include <linux/slab.h>
#include <linux/kernel.h>
#include <linux/skbuff.h>
#include <linux/netdevice.h>
#include <linux/etherdevice.h>
#include <linux/rcupdate.h>
#include <linux/export.h>
#include <net/mac80211.h>
#include <net/ieee80211_radiotap.h>
#include <asm/unaligned.h>
#include "ieee80211_i.h"
#include "driver-ops.h"
#include "led.h"
#include "mesh.h"
#include "wep.h"
#include "wpa.h"
#include "tkip.h"
#include "wme.h"
#include "rate.h"
/*
* monitor mode reception
*
* This function cleans up the SKB, i.e. it removes all the stuff
* only useful for monitoring.
*/
static struct sk_buff *remove_monitor_info(struct ieee80211_local *local,
struct sk_buff *skb)
{
if (local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS) {
if (likely(skb->len > FCS_LEN))
__pskb_trim(skb, skb->len - FCS_LEN);
else {
/* driver bug */
WARN_ON(1);
dev_kfree_skb(skb);
skb = NULL;
}
}
return skb;
}
static inline int should_drop_frame(struct sk_buff *skb,
int present_fcs_len)
{
struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
if (status->flag & (RX_FLAG_FAILED_FCS_CRC | RX_FLAG_FAILED_PLCP_CRC))
return 1;
if (unlikely(skb->len < 16 + present_fcs_len))
return 1;
if (ieee80211_is_ctl(hdr->frame_control) &&
!ieee80211_is_pspoll(hdr->frame_control) &&
!ieee80211_is_back_req(hdr->frame_control))
return 1;
return 0;
}
static int
ieee80211_rx_radiotap_len(struct ieee80211_local *local,
struct ieee80211_rx_status *status)
{
int len;
/* always present fields */
len = sizeof(struct ieee80211_radiotap_header) + 9;
if (status->flag & RX_FLAG_MACTIME_MPDU)
len += 8;
if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM)
len += 1;
if (len & 1) /* padding for RX_FLAGS if necessary */
len++;
if (status->flag & RX_FLAG_HT) /* HT info */
len += 3;
return len;
}
/*
* ieee80211_add_rx_radiotap_header - add radiotap header
*
* add a radiotap header containing all the fields which the hardware provided.
*/
static void
ieee80211_add_rx_radiotap_header(struct ieee80211_local *local,
struct sk_buff *skb,
struct ieee80211_rate *rate,
int rtap_len)
{
struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
struct ieee80211_radiotap_header *rthdr;
unsigned char *pos;
u16 rx_flags = 0;
rthdr = (struct ieee80211_radiotap_header *)skb_push(skb, rtap_len);
memset(rthdr, 0, rtap_len);
/* radiotap header, set always present flags */
rthdr->it_present =
cpu_to_le32((1 << IEEE80211_RADIOTAP_FLAGS) |
(1 << IEEE80211_RADIOTAP_CHANNEL) |
(1 << IEEE80211_RADIOTAP_ANTENNA) |
(1 << IEEE80211_RADIOTAP_RX_FLAGS));
rthdr->it_len = cpu_to_le16(rtap_len);
pos = (unsigned char *)(rthdr+1);
/* the order of the following fields is important */
/* IEEE80211_RADIOTAP_TSFT */
if (status->flag & RX_FLAG_MACTIME_MPDU) {
put_unaligned_le64(status->mactime, pos);
rthdr->it_present |=
cpu_to_le32(1 << IEEE80211_RADIOTAP_TSFT);
pos += 8;
}
/* IEEE80211_RADIOTAP_FLAGS */
if (local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS)
*pos |= IEEE80211_RADIOTAP_F_FCS;
if (status->flag & (RX_FLAG_FAILED_FCS_CRC | RX_FLAG_FAILED_PLCP_CRC))
*pos |= IEEE80211_RADIOTAP_F_BADFCS;
if (status->flag & RX_FLAG_SHORTPRE)
*pos |= IEEE80211_RADIOTAP_F_SHORTPRE;
pos++;
/* IEEE80211_RADIOTAP_RATE */
if (!rate || status->flag & RX_FLAG_HT) {
/*
* Without rate information don't add it. If we have,
* MCS information is a separate field in radiotap,
* added below. The byte here is needed as padding
* for the channel though, so initialise it to 0.
*/
*pos = 0;
} else {
rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_RATE);
*pos = rate->bitrate / 5;
}
pos++;
/* IEEE80211_RADIOTAP_CHANNEL */
put_unaligned_le16(status->freq, pos);
pos += 2;
if (status->band == IEEE80211_BAND_5GHZ)
put_unaligned_le16(IEEE80211_CHAN_OFDM | IEEE80211_CHAN_5GHZ,
pos);
else if (status->flag & RX_FLAG_HT)
put_unaligned_le16(IEEE80211_CHAN_DYN | IEEE80211_CHAN_2GHZ,
pos);
else if (rate && rate->flags & IEEE80211_RATE_ERP_G)
put_unaligned_le16(IEEE80211_CHAN_OFDM | IEEE80211_CHAN_2GHZ,
pos);
else if (rate)
put_unaligned_le16(IEEE80211_CHAN_CCK | IEEE80211_CHAN_2GHZ,
pos);
else
put_unaligned_le16(IEEE80211_CHAN_2GHZ, pos);
pos += 2;
/* IEEE80211_RADIOTAP_DBM_ANTSIGNAL */
if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM &&
!(status->flag & RX_FLAG_NO_SIGNAL_VAL)) {
*pos = status->signal;
rthdr->it_present |=
cpu_to_le32(1 << IEEE80211_RADIOTAP_DBM_ANTSIGNAL);
pos++;
}
/* IEEE80211_RADIOTAP_LOCK_QUALITY is missing */
/* IEEE80211_RADIOTAP_ANTENNA */
*pos = status->antenna;
pos++;
/* IEEE80211_RADIOTAP_DB_ANTNOISE is not used */
/* IEEE80211_RADIOTAP_RX_FLAGS */
/* ensure 2 byte alignment for the 2 byte field as required */
if ((pos - (u8 *)rthdr) & 1)
pos++;
if (status->flag & RX_FLAG_FAILED_PLCP_CRC)
rx_flags |= IEEE80211_RADIOTAP_F_RX_BADPLCP;
put_unaligned_le16(rx_flags, pos);
pos += 2;
if (status->flag & RX_FLAG_HT) {
rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_MCS);
*pos++ = IEEE80211_RADIOTAP_MCS_HAVE_MCS |
IEEE80211_RADIOTAP_MCS_HAVE_GI |
IEEE80211_RADIOTAP_MCS_HAVE_BW;
*pos = 0;
if (status->flag & RX_FLAG_SHORT_GI)
*pos |= IEEE80211_RADIOTAP_MCS_SGI;
if (status->flag & RX_FLAG_40MHZ)
*pos |= IEEE80211_RADIOTAP_MCS_BW_40;
pos++;
*pos++ = status->rate_idx;
}
}
/*
* This function copies a received frame to all monitor interfaces and
* returns a cleaned-up SKB that no longer includes the FCS nor the
* radiotap header the driver might have added.
*/
static struct sk_buff *
ieee80211_rx_monitor(struct ieee80211_local *local, struct sk_buff *origskb,
struct ieee80211_rate *rate)
{
struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(origskb);
struct ieee80211_sub_if_data *sdata;
int needed_headroom;
struct sk_buff *skb, *skb2;
struct net_device *prev_dev = NULL;
int present_fcs_len = 0;
/*
* First, we may need to make a copy of the skb because
* (1) we need to modify it for radiotap (if not present), and
* (2) the other RX handlers will modify the skb we got.
*
* We don't need to, of course, if we aren't going to return
* the SKB because it has a bad FCS/PLCP checksum.
*/
/* room for the radiotap header based on driver features */
needed_headroom = ieee80211_rx_radiotap_len(local, status);
if (local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS)
present_fcs_len = FCS_LEN;
/* make sure hdr->frame_control is on the linear part */
if (!pskb_may_pull(origskb, 2)) {
dev_kfree_skb(origskb);
return NULL;
}
if (!local->monitors) {
if (should_drop_frame(origskb, present_fcs_len)) {
dev_kfree_skb(origskb);
return NULL;
}
return remove_monitor_info(local, origskb);
}
if (should_drop_frame(origskb, present_fcs_len)) {
/* only need to expand headroom if necessary */
skb = origskb;
origskb = NULL;
/*
* This shouldn't trigger often because most devices have an
* RX header they pull before we get here, and that should
* be big enough for our radiotap information. We should
* probably export the length to drivers so that we can have
* them allocate enough headroom to start with.
*/
if (skb_headroom(skb) < needed_headroom &&
pskb_expand_head(skb, needed_headroom, 0, GFP_ATOMIC)) {
dev_kfree_skb(skb);
return NULL;
}
} else {
/*
* Need to make a copy and possibly remove radiotap header
* and FCS from the original.
*/
skb = skb_copy_expand(origskb, needed_headroom, 0, GFP_ATOMIC);
origskb = remove_monitor_info(local, origskb);
if (!skb)
return origskb;
}
/* prepend radiotap information */
ieee80211_add_rx_radiotap_header(local, skb, rate, needed_headroom);
skb_reset_mac_header(skb);
skb->ip_summed = CHECKSUM_UNNECESSARY;
skb->pkt_type = PACKET_OTHERHOST;
skb->protocol = htons(ETH_P_802_2);
list_for_each_entry_rcu(sdata, &local->interfaces, list) {
if (sdata->vif.type != NL80211_IFTYPE_MONITOR)
continue;
if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES)
continue;
if (!ieee80211_sdata_running(sdata))
continue;
if (prev_dev) {
skb2 = skb_clone(skb, GFP_ATOMIC);
if (skb2) {
skb2->dev = prev_dev;
netif_receive_skb(skb2);
}
}
prev_dev = sdata->dev;
sdata->dev->stats.rx_packets++;
sdata->dev->stats.rx_bytes += skb->len;
}
if (prev_dev) {
skb->dev = prev_dev;
netif_receive_skb(skb);
} else
dev_kfree_skb(skb);
return origskb;
}
static void ieee80211_parse_qos(struct ieee80211_rx_data *rx)
{
struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
int tid, seqno_idx, security_idx;
/* does the frame have a qos control field? */
if (ieee80211_is_data_qos(hdr->frame_control)) {
u8 *qc = ieee80211_get_qos_ctl(hdr);
/* frame has qos control */
tid = *qc & IEEE80211_QOS_CTL_TID_MASK;
if (*qc & IEEE80211_QOS_CTL_A_MSDU_PRESENT)
status->rx_flags |= IEEE80211_RX_AMSDU;
seqno_idx = tid;
security_idx = tid;
} else {
/*
* IEEE 802.11-2007, 7.1.3.4.1 ("Sequence Number field"):
*
* Sequence numbers for management frames, QoS data
* frames with a broadcast/multicast address in the
* Address 1 field, and all non-QoS data frames sent
* by QoS STAs are assigned using an additional single
* modulo-4096 counter, [...]
*
* We also use that counter for non-QoS STAs.
*/
seqno_idx = NUM_RX_DATA_QUEUES;
security_idx = 0;
if (ieee80211_is_mgmt(hdr->frame_control))
security_idx = NUM_RX_DATA_QUEUES;
tid = 0;
}
rx->seqno_idx = seqno_idx;
rx->security_idx = security_idx;
/* Set skb->priority to 1d tag if highest order bit of TID is not set.
* For now, set skb->priority to 0 for other cases. */
rx->skb->priority = (tid > 7) ? 0 : tid;
}
/**
* DOC: Packet alignment
*
* Drivers always need to pass packets that are aligned to two-byte boundaries
* to the stack.
*
* Additionally, should, if possible, align the payload data in a way that
* guarantees that the contained IP header is aligned to a four-byte
* boundary. In the case of regular frames, this simply means aligning the
* payload to a four-byte boundary (because either the IP header is directly
* contained, or IV/RFC1042 headers that have a length divisible by four are
* in front of it). If the payload data is not properly aligned and the
* architecture doesn't support efficient unaligned operations, mac80211
* will align the data.
*
* With A-MSDU frames, however, the payload data address must yield two modulo
* four because there are 14-byte 802.3 headers within the A-MSDU frames that
* push the IP header further back to a multiple of four again. Thankfully, the
* specs were sane enough this time around to require padding each A-MSDU
* subframe to a length that is a multiple of four.
*
* Padding like Atheros hardware adds which is between the 802.11 header and
* the payload is not supported, the driver is required to move the 802.11
* header to be directly in front of the payload in that case.
*/
static void ieee80211_verify_alignment(struct ieee80211_rx_data *rx)
{
#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
WARN_ONCE((unsigned long)rx->skb->data & 1,
"unaligned packet at 0x%p\n", rx->skb->data);
#endif
}
/* rx handlers */
static ieee80211_rx_result debug_noinline
ieee80211_rx_h_passive_scan(struct ieee80211_rx_data *rx)
{
struct ieee80211_local *local = rx->local;
struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
struct sk_buff *skb = rx->skb;
if (likely(!(status->rx_flags & IEEE80211_RX_IN_SCAN) &&
!local->sched_scanning))
return RX_CONTINUE;
if (test_bit(SCAN_HW_SCANNING, &local->scanning) ||
test_bit(SCAN_SW_SCANNING, &local->scanning) ||
local->sched_scanning)
return ieee80211_scan_rx(rx->sdata, skb);
/* scanning finished during invoking of handlers */
I802_DEBUG_INC(local->rx_handlers_drop_passive_scan);
return RX_DROP_UNUSABLE;
}
static int ieee80211_is_unicast_robust_mgmt_frame(struct sk_buff *skb)
{
struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
if (skb->len < 24 || is_multicast_ether_addr(hdr->addr1))
return 0;
return ieee80211_is_robust_mgmt_frame(hdr);
}
static int ieee80211_is_multicast_robust_mgmt_frame(struct sk_buff *skb)
{
struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
if (skb->len < 24 || !is_multicast_ether_addr(hdr->addr1))
return 0;
return ieee80211_is_robust_mgmt_frame(hdr);
}
/* Get the BIP key index from MMIE; return -1 if this is not a BIP frame */
static int ieee80211_get_mmie_keyidx(struct sk_buff *skb)
{
struct ieee80211_mgmt *hdr = (struct ieee80211_mgmt *) skb->data;
struct ieee80211_mmie *mmie;
if (skb->len < 24 + sizeof(*mmie) ||
!is_multicast_ether_addr(hdr->da))
return -1;
if (!ieee80211_is_robust_mgmt_frame((struct ieee80211_hdr *) hdr))
return -1; /* not a robust management frame */
mmie = (struct ieee80211_mmie *)
(skb->data + skb->len - sizeof(*mmie));
if (mmie->element_id != WLAN_EID_MMIE ||
mmie->length != sizeof(*mmie) - 2)
return -1;
return le16_to_cpu(mmie->key_id);
}
static ieee80211_rx_result
ieee80211_rx_mesh_check(struct ieee80211_rx_data *rx)
{
struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
char *dev_addr = rx->sdata->vif.addr;
if (ieee80211_is_data(hdr->frame_control)) {
if (is_multicast_ether_addr(hdr->addr1)) {
if (ieee80211_has_tods(hdr->frame_control) ||
!ieee80211_has_fromds(hdr->frame_control))
return RX_DROP_MONITOR;
if (compare_ether_addr(hdr->addr3, dev_addr) == 0)
return RX_DROP_MONITOR;
} else {
if (!ieee80211_has_a4(hdr->frame_control))
return RX_DROP_MONITOR;
if (compare_ether_addr(hdr->addr4, dev_addr) == 0)
return RX_DROP_MONITOR;
}
}
/* If there is not an established peer link and this is not a peer link
* establisment frame, beacon or probe, drop the frame.
*/
if (!rx->sta || sta_plink_state(rx->sta) != NL80211_PLINK_ESTAB) {
struct ieee80211_mgmt *mgmt;
if (!ieee80211_is_mgmt(hdr->frame_control))
return RX_DROP_MONITOR;
if (ieee80211_is_action(hdr->frame_control)) {
u8 category;
mgmt = (struct ieee80211_mgmt *)hdr;
category = mgmt->u.action.category;
if (category != WLAN_CATEGORY_MESH_ACTION &&
category != WLAN_CATEGORY_SELF_PROTECTED)
return RX_DROP_MONITOR;
return RX_CONTINUE;
}
if (ieee80211_is_probe_req(hdr->frame_control) ||
ieee80211_is_probe_resp(hdr->frame_control) ||
ieee80211_is_beacon(hdr->frame_control) ||
ieee80211_is_auth(hdr->frame_control))
return RX_CONTINUE;
return RX_DROP_MONITOR;
}
return RX_CONTINUE;
}
#define SEQ_MODULO 0x1000
#define SEQ_MASK 0xfff
static inline int seq_less(u16 sq1, u16 sq2)
{
return ((sq1 - sq2) & SEQ_MASK) > (SEQ_MODULO >> 1);
}
static inline u16 seq_inc(u16 sq)
{
return (sq + 1) & SEQ_MASK;
}
static inline u16 seq_sub(u16 sq1, u16 sq2)
{
return (sq1 - sq2) & SEQ_MASK;
}
static void ieee80211_release_reorder_frame(struct ieee80211_hw *hw,
struct tid_ampdu_rx *tid_agg_rx,
int index)
{
struct ieee80211_local *local = hw_to_local(hw);
struct sk_buff *skb = tid_agg_rx->reorder_buf[index];
struct ieee80211_rx_status *status;
lockdep_assert_held(&tid_agg_rx->reorder_lock);
if (!skb)
goto no_frame;
/* release the frame from the reorder ring buffer */
tid_agg_rx->stored_mpdu_num--;
tid_agg_rx->reorder_buf[index] = NULL;
status = IEEE80211_SKB_RXCB(skb);
status->rx_flags |= IEEE80211_RX_DEFERRED_RELEASE;
skb_queue_tail(&local->rx_skb_queue, skb);
no_frame:
tid_agg_rx->head_seq_num = seq_inc(tid_agg_rx->head_seq_num);
}
static void ieee80211_release_reorder_frames(struct ieee80211_hw *hw,
struct tid_ampdu_rx *tid_agg_rx,
u16 head_seq_num)
{
int index;
lockdep_assert_held(&tid_agg_rx->reorder_lock);
while (seq_less(tid_agg_rx->head_seq_num, head_seq_num)) {
index = seq_sub(tid_agg_rx->head_seq_num, tid_agg_rx->ssn) %
tid_agg_rx->buf_size;
ieee80211_release_reorder_frame(hw, tid_agg_rx, index);
}
}
/*
* Timeout (in jiffies) for skb's that are waiting in the RX reorder buffer. If
* the skb was added to the buffer longer than this time ago, the earlier
* frames that have not yet been received are assumed to be lost and the skb
* can be released for processing. This may also release other skb's from the
* reorder buffer if there are no additional gaps between the frames.
*
* Callers must hold tid_agg_rx->reorder_lock.
*/
#define HT_RX_REORDER_BUF_TIMEOUT (HZ / 10)
static void ieee80211_sta_reorder_release(struct ieee80211_hw *hw,
struct tid_ampdu_rx *tid_agg_rx)
{
int index, j;
lockdep_assert_held(&tid_agg_rx->reorder_lock);
/* release the buffer until next missing frame */
index = seq_sub(tid_agg_rx->head_seq_num, tid_agg_rx->ssn) %
tid_agg_rx->buf_size;
if (!tid_agg_rx->reorder_buf[index] &&
tid_agg_rx->stored_mpdu_num) {
/*
* No buffers ready to be released, but check whether any
* frames in the reorder buffer have timed out.
*/
int skipped = 1;
for (j = (index + 1) % tid_agg_rx->buf_size; j != index;
j = (j + 1) % tid_agg_rx->buf_size) {
if (!tid_agg_rx->reorder_buf[j]) {
skipped++;
continue;
}
if (skipped &&
!time_after(jiffies, tid_agg_rx->reorder_time[j] +
HT_RX_REORDER_BUF_TIMEOUT))
goto set_release_timer;
#ifdef CONFIG_MAC80211_HT_DEBUG
if (net_ratelimit())
wiphy_debug(hw->wiphy,
"release an RX reorder frame due to timeout on earlier frames\n");
#endif
ieee80211_release_reorder_frame(hw, tid_agg_rx, j);
/*
* Increment the head seq# also for the skipped slots.
*/
tid_agg_rx->head_seq_num =
(tid_agg_rx->head_seq_num + skipped) & SEQ_MASK;
skipped = 0;
}
} else while (tid_agg_rx->reorder_buf[index]) {
ieee80211_release_reorder_frame(hw, tid_agg_rx, index);
index = seq_sub(tid_agg_rx->head_seq_num, tid_agg_rx->ssn) %
tid_agg_rx->buf_size;
}
if (tid_agg_rx->stored_mpdu_num) {
j = index = seq_sub(tid_agg_rx->head_seq_num,
tid_agg_rx->ssn) % tid_agg_rx->buf_size;
for (; j != (index - 1) % tid_agg_rx->buf_size;
j = (j + 1) % tid_agg_rx->buf_size) {
if (tid_agg_rx->reorder_buf[j])
break;
}
set_release_timer:
mod_timer(&tid_agg_rx->reorder_timer,
tid_agg_rx->reorder_time[j] + 1 +
HT_RX_REORDER_BUF_TIMEOUT);
} else {
del_timer(&tid_agg_rx->reorder_timer);
}
}
/*
* As this function belongs to the RX path it must be under
* rcu_read_lock protection. It returns false if the frame
* can be processed immediately, true if it was consumed.
*/
static bool ieee80211_sta_manage_reorder_buf(struct ieee80211_hw *hw,
struct tid_ampdu_rx *tid_agg_rx,
struct sk_buff *skb)
{
struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
u16 sc = le16_to_cpu(hdr->seq_ctrl);
u16 mpdu_seq_num = (sc & IEEE80211_SCTL_SEQ) >> 4;
u16 head_seq_num, buf_size;
int index;
bool ret = true;
spin_lock(&tid_agg_rx->reorder_lock);
buf_size = tid_agg_rx->buf_size;
head_seq_num = tid_agg_rx->head_seq_num;
/* frame with out of date sequence number */
if (seq_less(mpdu_seq_num, head_seq_num)) {
dev_kfree_skb(skb);
goto out;
}
/*
* If frame the sequence number exceeds our buffering window
* size release some previous frames to make room for this one.
*/
if (!seq_less(mpdu_seq_num, head_seq_num + buf_size)) {
head_seq_num = seq_inc(seq_sub(mpdu_seq_num, buf_size));
/* release stored frames up to new head to stack */
ieee80211_release_reorder_frames(hw, tid_agg_rx, head_seq_num);
}
/* Now the new frame is always in the range of the reordering buffer */
index = seq_sub(mpdu_seq_num, tid_agg_rx->ssn) % tid_agg_rx->buf_size;
/* check if we already stored this frame */
if (tid_agg_rx->reorder_buf[index]) {
dev_kfree_skb(skb);
goto out;
}
/*
* If the current MPDU is in the right order and nothing else
* is stored we can process it directly, no need to buffer it.
* If it is first but there's something stored, we may be able
* to release frames after this one.
*/
if (mpdu_seq_num == tid_agg_rx->head_seq_num &&
tid_agg_rx->stored_mpdu_num == 0) {
tid_agg_rx->head_seq_num = seq_inc(tid_agg_rx->head_seq_num);
ret = false;
goto out;
}
/* put the frame in the reordering buffer */
tid_agg_rx->reorder_buf[index] = skb;
tid_agg_rx->reorder_time[index] = jiffies;
tid_agg_rx->stored_mpdu_num++;
ieee80211_sta_reorder_release(hw, tid_agg_rx);
out:
spin_unlock(&tid_agg_rx->reorder_lock);
return ret;
}
/*
* Reorder MPDUs from A-MPDUs, keeping them on a buffer. Returns
* true if the MPDU was buffered, false if it should be processed.
*/
static void ieee80211_rx_reorder_ampdu(struct ieee80211_rx_data *rx)
{
struct sk_buff *skb = rx->skb;
struct ieee80211_local *local = rx->local;
struct ieee80211_hw *hw = &local->hw;
struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
struct sta_info *sta = rx->sta;
struct tid_ampdu_rx *tid_agg_rx;
u16 sc;
u8 tid, ack_policy;
if (!ieee80211_is_data_qos(hdr->frame_control))
goto dont_reorder;
/*
* filter the QoS data rx stream according to
* STA/TID and check if this STA/TID is on aggregation
*/
if (!sta)
goto dont_reorder;
ack_policy = *ieee80211_get_qos_ctl(hdr) &
IEEE80211_QOS_CTL_ACK_POLICY_MASK;
tid = *ieee80211_get_qos_ctl(hdr) & IEEE80211_QOS_CTL_TID_MASK;
tid_agg_rx = rcu_dereference(sta->ampdu_mlme.tid_rx[tid]);
if (!tid_agg_rx)
goto dont_reorder;
/* qos null data frames are excluded */
if (unlikely(hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_NULLFUNC)))
goto dont_reorder;
/* not part of a BA session */
if (ack_policy != IEEE80211_QOS_CTL_ACK_POLICY_BLOCKACK &&
ack_policy != IEEE80211_QOS_CTL_ACK_POLICY_NORMAL)
goto dont_reorder;
/* not actually part of this BA session */
if (!(status->rx_flags & IEEE80211_RX_RA_MATCH))
goto dont_reorder;
/* new, potentially un-ordered, ampdu frame - process it */
/* reset session timer */
if (tid_agg_rx->timeout)
mod_timer(&tid_agg_rx->session_timer,
TU_TO_EXP_TIME(tid_agg_rx->timeout));
/* if this mpdu is fragmented - terminate rx aggregation session */
sc = le16_to_cpu(hdr->seq_ctrl);
if (sc & IEEE80211_SCTL_FRAG) {
skb->pkt_type = IEEE80211_SDATA_QUEUE_TYPE_FRAME;
skb_queue_tail(&rx->sdata->skb_queue, skb);
ieee80211_queue_work(&local->hw, &rx->sdata->work);
return;
}
/*
* No locking needed -- we will only ever process one
* RX packet at a time, and thus own tid_agg_rx. All
* other code manipulating it needs to (and does) make
* sure that we cannot get to it any more before doing
* anything with it.
*/
if (ieee80211_sta_manage_reorder_buf(hw, tid_agg_rx, skb))
return;
dont_reorder:
skb_queue_tail(&local->rx_skb_queue, skb);
}
static ieee80211_rx_result debug_noinline
ieee80211_rx_h_check(struct ieee80211_rx_data *rx)
{
struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
/* Drop duplicate 802.11 retransmissions (IEEE 802.11 Chap. 9.2.9) */
if (rx->sta && !is_multicast_ether_addr(hdr->addr1)) {
if (unlikely(ieee80211_has_retry(hdr->frame_control) &&
rx->sta->last_seq_ctrl[rx->seqno_idx] ==
hdr->seq_ctrl)) {
if (status->rx_flags & IEEE80211_RX_RA_MATCH) {
rx->local->dot11FrameDuplicateCount++;
rx->sta->num_duplicates++;
}
return RX_DROP_UNUSABLE;
} else
rx->sta->last_seq_ctrl[rx->seqno_idx] = hdr->seq_ctrl;
}
if (unlikely(rx->skb->len < 16)) {
I802_DEBUG_INC(rx->local->rx_handlers_drop_short);
return RX_DROP_MONITOR;
}
/* Drop disallowed frame classes based on STA auth/assoc state;
* IEEE 802.11, Chap 5.5.
*
* mac80211 filters only based on association state, i.e. it drops
* Class 3 frames from not associated stations. hostapd sends
* deauth/disassoc frames when needed. In addition, hostapd is
* responsible for filtering on both auth and assoc states.
*/
if (ieee80211_vif_is_mesh(&rx->sdata->vif))
return ieee80211_rx_mesh_check(rx);
if (unlikely((ieee80211_is_data(hdr->frame_control) ||
ieee80211_is_pspoll(hdr->frame_control)) &&
rx->sdata->vif.type != NL80211_IFTYPE_ADHOC &&
rx->sdata->vif.type != NL80211_IFTYPE_WDS &&
(!rx->sta || !test_sta_flag(rx->sta, WLAN_STA_ASSOC)))) {
/*
* accept port control frames from the AP even when it's not
* yet marked ASSOC to prevent a race where we don't set the
* assoc bit quickly enough before it sends the first frame
*/
if (rx->sta && rx->sdata->vif.type == NL80211_IFTYPE_STATION &&
ieee80211_is_data_present(hdr->frame_control)) {
u16 ethertype;
u8 *payload;
payload = rx->skb->data +
ieee80211_hdrlen(hdr->frame_control);
ethertype = (payload[6] << 8) | payload[7];
if (cpu_to_be16(ethertype) ==
rx->sdata->control_port_protocol)
return RX_CONTINUE;
}
if (rx->sdata->vif.type == NL80211_IFTYPE_AP &&
cfg80211_rx_spurious_frame(rx->sdata->dev,
hdr->addr2,
GFP_ATOMIC))
return RX_DROP_UNUSABLE;
return RX_DROP_MONITOR;
}
return RX_CONTINUE;
}
static ieee80211_rx_result debug_noinline
ieee80211_rx_h_decrypt(struct ieee80211_rx_data *rx)
{
struct sk_buff *skb = rx->skb;
struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
int keyidx;
int hdrlen;
ieee80211_rx_result result = RX_DROP_UNUSABLE;
struct ieee80211_key *sta_ptk = NULL;
int mmie_keyidx = -1;
__le16 fc;
/*
* Key selection 101
*
* There are four types of keys:
* - GTK (group keys)
* - IGTK (group keys for management frames)
* - PTK (pairwise keys)
* - STK (station-to-station pairwise keys)
*
* When selecting a key, we have to distinguish between multicast
* (including broadcast) and unicast frames, the latter can only
* use PTKs and STKs while the former always use GTKs and IGTKs.
* Unless, of course, actual WEP keys ("pre-RSNA") are used, then
* unicast frames can also use key indices like GTKs. Hence, if we
* don't have a PTK/STK we check the key index for a WEP key.
*
* Note that in a regular BSS, multicast frames are sent by the
* AP only, associated stations unicast the frame to the AP first
* which then multicasts it on their behalf.
*
* There is also a slight problem in IBSS mode: GTKs are negotiated
* with each station, that is something we don't currently handle.
* The spec seems to expect that one negotiates the same key with
* every station but there's no such requirement; VLANs could be
* possible.
*/
/*
* No point in finding a key and decrypting if the frame is neither
* addressed to us nor a multicast frame.
*/
if (!(status->rx_flags & IEEE80211_RX_RA_MATCH))
return RX_CONTINUE;
/* start without a key */
rx->key = NULL;
if (rx->sta)
sta_ptk = rcu_dereference(rx->sta->ptk);
fc = hdr->frame_control;
if (!ieee80211_has_protected(fc))
mmie_keyidx = ieee80211_get_mmie_keyidx(rx->skb);
if (!is_multicast_ether_addr(hdr->addr1) && sta_ptk) {
rx->key = sta_ptk;
if ((status->flag & RX_FLAG_DECRYPTED) &&
(status->flag & RX_FLAG_IV_STRIPPED))
return RX_CONTINUE;
/* Skip decryption if the frame is not protected. */
if (!ieee80211_has_protected(fc))
return RX_CONTINUE;
} else if (mmie_keyidx >= 0) {
/* Broadcast/multicast robust management frame / BIP */
if ((status->flag & RX_FLAG_DECRYPTED) &&
(status->flag & RX_FLAG_IV_STRIPPED))
return RX_CONTINUE;
if (mmie_keyidx < NUM_DEFAULT_KEYS ||
mmie_keyidx >= NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS)
return RX_DROP_MONITOR; /* unexpected BIP keyidx */
if (rx->sta)
rx->key = rcu_dereference(rx->sta->gtk[mmie_keyidx]);
if (!rx->key)
rx->key = rcu_dereference(rx->sdata->keys[mmie_keyidx]);
} else if (!ieee80211_has_protected(fc)) {
/*
* The frame was not protected, so skip decryption. However, we
* need to set rx->key if there is a key that could have been
* used so that the frame may be dropped if encryption would
* have been expected.
*/
struct ieee80211_key *key = NULL;
struct ieee80211_sub_if_data *sdata = rx->sdata;
int i;
if (ieee80211_is_mgmt(fc) &&
is_multicast_ether_addr(hdr->addr1) &&
(key = rcu_dereference(rx->sdata->default_mgmt_key)))
rx->key = key;
else {
if (rx->sta) {
for (i = 0; i < NUM_DEFAULT_KEYS; i++) {
key = rcu_dereference(rx->sta->gtk[i]);
if (key)
break;
}
}
if (!key) {
for (i = 0; i < NUM_DEFAULT_KEYS; i++) {
key = rcu_dereference(sdata->keys[i]);
if (key)
break;
}
}
if (key)
rx->key = key;
}
return RX_CONTINUE;
} else {
u8 keyid;
/*
* The device doesn't give us the IV so we won't be
* able to look up the key. That's ok though, we
* don't need to decrypt the frame, we just won't
* be able to keep statistics accurate.
* Except for key threshold notifications, should
* we somehow allow the driver to tell us which key
* the hardware used if this flag is set?
*/
if ((status->flag & RX_FLAG_DECRYPTED) &&
(status->flag & RX_FLAG_IV_STRIPPED))
return RX_CONTINUE;
hdrlen = ieee80211_hdrlen(fc);
if (rx->skb->len < 8 + hdrlen)
return RX_DROP_UNUSABLE; /* TODO: count this? */
/*
* no need to call ieee80211_wep_get_keyidx,
* it verifies a bunch of things we've done already
*/
skb_copy_bits(rx->skb, hdrlen + 3, &keyid, 1);
keyidx = keyid >> 6;
/* check per-station GTK first, if multicast packet */
if (is_multicast_ether_addr(hdr->addr1) && rx->sta)
rx->key = rcu_dereference(rx->sta->gtk[keyidx]);
/* if not found, try default key */
if (!rx->key) {
rx->key = rcu_dereference(rx->sdata->keys[keyidx]);
/*
* RSNA-protected unicast frames should always be
* sent with pairwise or station-to-station keys,
* but for WEP we allow using a key index as well.
*/
if (rx->key &&
rx->key->conf.cipher != WLAN_CIPHER_SUITE_WEP40 &&
rx->key->conf.cipher != WLAN_CIPHER_SUITE_WEP104 &&
!is_multicast_ether_addr(hdr->addr1))
rx->key = NULL;
}
}
if (rx->key) {
if (unlikely(rx->key->flags & KEY_FLAG_TAINTED))
return RX_DROP_MONITOR;
rx->key->tx_rx_count++;
/* TODO: add threshold stuff again */
} else {
return RX_DROP_MONITOR;
}
switch (rx->key->conf.cipher) {
case WLAN_CIPHER_SUITE_WEP40:
case WLAN_CIPHER_SUITE_WEP104:
result = ieee80211_crypto_wep_decrypt(rx);
break;
case WLAN_CIPHER_SUITE_TKIP:
result = ieee80211_crypto_tkip_decrypt(rx);
break;
case WLAN_CIPHER_SUITE_CCMP:
result = ieee80211_crypto_ccmp_decrypt(rx);
break;
case WLAN_CIPHER_SUITE_AES_CMAC:
result = ieee80211_crypto_aes_cmac_decrypt(rx);
break;
default:
/*
* We can reach here only with HW-only algorithms
* but why didn't it decrypt the frame?!
*/
return RX_DROP_UNUSABLE;
}
/* the hdr variable is invalid after the decrypt handlers */
/* either the frame has been decrypted or will be dropped */
status->flag |= RX_FLAG_DECRYPTED;
return result;
}
static ieee80211_rx_result debug_noinline
ieee80211_rx_h_check_more_data(struct ieee80211_rx_data *rx)
{
struct ieee80211_local *local;
struct ieee80211_hdr *hdr;
struct sk_buff *skb;
local = rx->local;
skb = rx->skb;
hdr = (struct ieee80211_hdr *) skb->data;
if (!local->pspolling)
return RX_CONTINUE;
if (!ieee80211_has_fromds(hdr->frame_control))
/* this is not from AP */
return RX_CONTINUE;
if (!ieee80211_is_data(hdr->frame_control))
return RX_CONTINUE;
if (!ieee80211_has_moredata(hdr->frame_control)) {
/* AP has no more frames buffered for us */
local->pspolling = false;
return RX_CONTINUE;
}
/* more data bit is set, let's request a new frame from the AP */
ieee80211_send_pspoll(local, rx->sdata);
return RX_CONTINUE;
}
static void ap_sta_ps_start(struct sta_info *sta)
{
struct ieee80211_sub_if_data *sdata = sta->sdata;
struct ieee80211_local *local = sdata->local;
atomic_inc(&sdata->bss->num_sta_ps);
set_sta_flag(sta, WLAN_STA_PS_STA);
if (!(local->hw.flags & IEEE80211_HW_AP_LINK_PS))
drv_sta_notify(local, sdata, STA_NOTIFY_SLEEP, &sta->sta);
#ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
printk(KERN_DEBUG "%s: STA %pM aid %d enters power save mode\n",
sdata->name, sta->sta.addr, sta->sta.aid);
#endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
}
static void ap_sta_ps_end(struct sta_info *sta)
{
#ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
printk(KERN_DEBUG "%s: STA %pM aid %d exits power save mode\n",
sta->sdata->name, sta->sta.addr, sta->sta.aid);
#endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
if (test_sta_flag(sta, WLAN_STA_PS_DRIVER)) {
#ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
printk(KERN_DEBUG "%s: STA %pM aid %d driver-ps-blocked\n",
sta->sdata->name, sta->sta.addr, sta->sta.aid);
#endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
return;
}
ieee80211_sta_ps_deliver_wakeup(sta);
}
int ieee80211_sta_ps_transition(struct ieee80211_sta *sta, bool start)
{
struct sta_info *sta_inf = container_of(sta, struct sta_info, sta);
bool in_ps;
WARN_ON(!(sta_inf->local->hw.flags & IEEE80211_HW_AP_LINK_PS));
/* Don't let the same PS state be set twice */
in_ps = test_sta_flag(sta_inf, WLAN_STA_PS_STA);
if ((start && in_ps) || (!start && !in_ps))
return -EINVAL;
if (start)
ap_sta_ps_start(sta_inf);
else
ap_sta_ps_end(sta_inf);
return 0;
}
EXPORT_SYMBOL(ieee80211_sta_ps_transition);
static ieee80211_rx_result debug_noinline
ieee80211_rx_h_uapsd_and_pspoll(struct ieee80211_rx_data *rx)
{
struct ieee80211_sub_if_data *sdata = rx->sdata;
struct ieee80211_hdr *hdr = (void *)rx->skb->data;
struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
int tid, ac;
if (!rx->sta || !(status->rx_flags & IEEE80211_RX_RA_MATCH))
return RX_CONTINUE;
if (sdata->vif.type != NL80211_IFTYPE_AP &&
sdata->vif.type != NL80211_IFTYPE_AP_VLAN)
return RX_CONTINUE;
/*
* The device handles station powersave, so don't do anything about
* uAPSD and PS-Poll frames (the latter shouldn't even come up from
* it to mac80211 since they're handled.)
*/
if (sdata->local->hw.flags & IEEE80211_HW_AP_LINK_PS)
return RX_CONTINUE;
/*
* Don't do anything if the station isn't already asleep. In
* the uAPSD case, the station will probably be marked asleep,
* in the PS-Poll case the station must be confused ...
*/
if (!test_sta_flag(rx->sta, WLAN_STA_PS_STA))
return RX_CONTINUE;
if (unlikely(ieee80211_is_pspoll(hdr->frame_control))) {
if (!test_sta_flag(rx->sta, WLAN_STA_SP)) {
if (!test_sta_flag(rx->sta, WLAN_STA_PS_DRIVER))
ieee80211_sta_ps_deliver_poll_response(rx->sta);
else
set_sta_flag(rx->sta, WLAN_STA_PSPOLL);
}
/* Free PS Poll skb here instead of returning RX_DROP that would
* count as an dropped frame. */
dev_kfree_skb(rx->skb);
return RX_QUEUED;
} else if (!ieee80211_has_morefrags(hdr->frame_control) &&
!(status->rx_flags & IEEE80211_RX_DEFERRED_RELEASE) &&
ieee80211_has_pm(hdr->frame_control) &&
(ieee80211_is_data_qos(hdr->frame_control) ||
ieee80211_is_qos_nullfunc(hdr->frame_control))) {
tid = *ieee80211_get_qos_ctl(hdr) & IEEE80211_QOS_CTL_TID_MASK;
ac = ieee802_1d_to_ac[tid & 7];
/*
* If this AC is not trigger-enabled do nothing.
*
* NB: This could/should check a separate bitmap of trigger-
* enabled queues, but for now we only implement uAPSD w/o
* TSPEC changes to the ACs, so they're always the same.
*/
if (!(rx->sta->sta.uapsd_queues & BIT(ac)))
return RX_CONTINUE;
/* if we are in a service period, do nothing */
if (test_sta_flag(rx->sta, WLAN_STA_SP))
return RX_CONTINUE;
if (!test_sta_flag(rx->sta, WLAN_STA_PS_DRIVER))
ieee80211_sta_ps_deliver_uapsd(rx->sta);
else
set_sta_flag(rx->sta, WLAN_STA_UAPSD);
}
return RX_CONTINUE;
}
static ieee80211_rx_result debug_noinline
ieee80211_rx_h_sta_process(struct ieee80211_rx_data *rx)
{
struct sta_info *sta = rx->sta;
struct sk_buff *skb = rx->skb;
struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
if (!sta)
return RX_CONTINUE;
/*
* Update last_rx only for IBSS packets which are for the current
* BSSID to avoid keeping the current IBSS network alive in cases
* where other STAs start using different BSSID.
*/
if (rx->sdata->vif.type == NL80211_IFTYPE_ADHOC) {
u8 *bssid = ieee80211_get_bssid(hdr, rx->skb->len,
NL80211_IFTYPE_ADHOC);
if (compare_ether_addr(bssid, rx->sdata->u.ibss.bssid) == 0) {
sta->last_rx = jiffies;
if (ieee80211_is_data(hdr->frame_control)) {
sta->last_rx_rate_idx = status->rate_idx;
sta->last_rx_rate_flag = status->flag;
}
}
} else if (!is_multicast_ether_addr(hdr->addr1)) {
/*
* Mesh beacons will update last_rx when if they are found to
* match the current local configuration when processed.
*/
sta->last_rx = jiffies;
if (ieee80211_is_data(hdr->frame_control)) {
sta->last_rx_rate_idx = status->rate_idx;
sta->last_rx_rate_flag = status->flag;
}
}
if (!(status->rx_flags & IEEE80211_RX_RA_MATCH))
return RX_CONTINUE;
if (rx->sdata->vif.type == NL80211_IFTYPE_STATION)
ieee80211_sta_rx_notify(rx->sdata, hdr);
sta->rx_fragments++;
sta->rx_bytes += rx->skb->len;
if (!(status->flag & RX_FLAG_NO_SIGNAL_VAL)) {
sta->last_signal = status->signal;
ewma_add(&sta->avg_signal, -status->signal);
}
/*
* Change STA power saving mode only at the end of a frame
* exchange sequence.
*/
if (!(sta->local->hw.flags & IEEE80211_HW_AP_LINK_PS) &&
!ieee80211_has_morefrags(hdr->frame_control) &&
!(status->rx_flags & IEEE80211_RX_DEFERRED_RELEASE) &&
(rx->sdata->vif.type == NL80211_IFTYPE_AP ||
rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN)) {
if (test_sta_flag(sta, WLAN_STA_PS_STA)) {
/*
* Ignore doze->wake transitions that are
* indicated by non-data frames, the standard
* is unclear here, but for example going to
* PS mode and then scanning would cause a
* doze->wake transition for the probe request,
* and that is clearly undesirable.
*/
if (ieee80211_is_data(hdr->frame_control) &&
!ieee80211_has_pm(hdr->frame_control))
ap_sta_ps_end(sta);
} else {
if (ieee80211_has_pm(hdr->frame_control))
ap_sta_ps_start(sta);
}
}
/*
* Drop (qos-)data::nullfunc frames silently, since they
* are used only to control station power saving mode.
*/
if (ieee80211_is_nullfunc(hdr->frame_control) ||
ieee80211_is_qos_nullfunc(hdr->frame_control)) {
I802_DEBUG_INC(rx->local->rx_handlers_drop_nullfunc);
/*
* If we receive a 4-addr nullfunc frame from a STA
* that was not moved to a 4-addr STA vlan yet send
* the event to userspace and for older hostapd drop
* the frame to the monitor interface.
*/
if (ieee80211_has_a4(hdr->frame_control) &&
(rx->sdata->vif.type == NL80211_IFTYPE_AP ||
(rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
!rx->sdata->u.vlan.sta))) {
if (!test_and_set_sta_flag(sta, WLAN_STA_4ADDR_EVENT))
cfg80211_rx_unexpected_4addr_frame(
rx->sdata->dev, sta->sta.addr,
GFP_ATOMIC);
return RX_DROP_MONITOR;
}
/*
* Update counter and free packet here to avoid
* counting this as a dropped packed.
*/
sta->rx_packets++;
dev_kfree_skb(rx->skb);
return RX_QUEUED;
}
return RX_CONTINUE;
} /* ieee80211_rx_h_sta_process */
static inline struct ieee80211_fragment_entry *
ieee80211_reassemble_add(struct ieee80211_sub_if_data *sdata,
unsigned int frag, unsigned int seq, int rx_queue,
struct sk_buff **skb)
{
struct ieee80211_fragment_entry *entry;
int idx;
idx = sdata->fragment_next;
entry = &sdata->fragments[sdata->fragment_next++];
if (sdata->fragment_next >= IEEE80211_FRAGMENT_MAX)
sdata->fragment_next = 0;
if (!skb_queue_empty(&entry->skb_list)) {
#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
struct ieee80211_hdr *hdr =
(struct ieee80211_hdr *) entry->skb_list.next->data;
printk(KERN_DEBUG "%s: RX reassembly removed oldest "
"fragment entry (idx=%d age=%lu seq=%d last_frag=%d "
"addr1=%pM addr2=%pM\n",
sdata->name, idx,
jiffies - entry->first_frag_time, entry->seq,
entry->last_frag, hdr->addr1, hdr->addr2);
#endif
__skb_queue_purge(&entry->skb_list);
}
__skb_queue_tail(&entry->skb_list, *skb); /* no need for locking */
*skb = NULL;
entry->first_frag_time = jiffies;
entry->seq = seq;
entry->rx_queue = rx_queue;
entry->last_frag = frag;
entry->ccmp = 0;
entry->extra_len = 0;
return entry;
}
static inline struct ieee80211_fragment_entry *
ieee80211_reassemble_find(struct ieee80211_sub_if_data *sdata,
unsigned int frag, unsigned int seq,
int rx_queue, struct ieee80211_hdr *hdr)
{
struct ieee80211_fragment_entry *entry;
int i, idx;
idx = sdata->fragment_next;
for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++) {
struct ieee80211_hdr *f_hdr;
idx--;
if (idx < 0)
idx = IEEE80211_FRAGMENT_MAX - 1;
entry = &sdata->fragments[idx];
if (skb_queue_empty(&entry->skb_list) || entry->seq != seq ||
entry->rx_queue != rx_queue ||
entry->last_frag + 1 != frag)
continue;
f_hdr = (struct ieee80211_hdr *)entry->skb_list.next->data;
/*
* Check ftype and addresses are equal, else check next fragment
*/
if (((hdr->frame_control ^ f_hdr->frame_control) &
cpu_to_le16(IEEE80211_FCTL_FTYPE)) ||
compare_ether_addr(hdr->addr1, f_hdr->addr1) != 0 ||
compare_ether_addr(hdr->addr2, f_hdr->addr2) != 0)
continue;
if (time_after(jiffies, entry->first_frag_time + 2 * HZ)) {
__skb_queue_purge(&entry->skb_list);
continue;
}
return entry;
}
return NULL;
}
static ieee80211_rx_result debug_noinline
ieee80211_rx_h_defragment(struct ieee80211_rx_data *rx)
{
struct ieee80211_hdr *hdr;
u16 sc;
__le16 fc;
unsigned int frag, seq;
struct ieee80211_fragment_entry *entry;
struct sk_buff *skb;
struct ieee80211_rx_status *status;
hdr = (struct ieee80211_hdr *)rx->skb->data;
fc = hdr->frame_control;
sc = le16_to_cpu(hdr->seq_ctrl);
frag = sc & IEEE80211_SCTL_FRAG;
if (likely((!ieee80211_has_morefrags(fc) && frag == 0) ||
(rx->skb)->len < 24 ||
is_multicast_ether_addr(hdr->addr1))) {
/* not fragmented */
goto out;
}
I802_DEBUG_INC(rx->local->rx_handlers_fragments);
if (skb_linearize(rx->skb))
return RX_DROP_UNUSABLE;
/*
* skb_linearize() might change the skb->data and
* previously cached variables (in this case, hdr) need to
* be refreshed with the new data.
*/
hdr = (struct ieee80211_hdr *)rx->skb->data;
seq = (sc & IEEE80211_SCTL_SEQ) >> 4;
if (frag == 0) {
/* This is the first fragment of a new frame. */
entry = ieee80211_reassemble_add(rx->sdata, frag, seq,
rx->seqno_idx, &(rx->skb));
if (rx->key && rx->key->conf.cipher == WLAN_CIPHER_SUITE_CCMP &&
ieee80211_has_protected(fc)) {
int queue = rx->security_idx;
/* Store CCMP PN so that we can verify that the next
* fragment has a sequential PN value. */
entry->ccmp = 1;
memcpy(entry->last_pn,
rx->key->u.ccmp.rx_pn[queue],
CCMP_PN_LEN);
}
return RX_QUEUED;
}
/* This is a fragment for a frame that should already be pending in
* fragment cache. Add this fragment to the end of the pending entry.
*/
entry = ieee80211_reassemble_find(rx->sdata, frag, seq,
rx->seqno_idx, hdr);
if (!entry) {
I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag);
return RX_DROP_MONITOR;
}
/* Verify that MPDUs within one MSDU have sequential PN values.
* (IEEE 802.11i, 8.3.3.4.5) */
if (entry->ccmp) {
int i;
u8 pn[CCMP_PN_LEN], *rpn;
int queue;
if (!rx->key || rx->key->conf.cipher != WLAN_CIPHER_SUITE_CCMP)
return RX_DROP_UNUSABLE;
memcpy(pn, entry->last_pn, CCMP_PN_LEN);
for (i = CCMP_PN_LEN - 1; i >= 0; i--) {
pn[i]++;
if (pn[i])
break;
}
queue = rx->security_idx;
rpn = rx->key->u.ccmp.rx_pn[queue];
if (memcmp(pn, rpn, CCMP_PN_LEN))
return RX_DROP_UNUSABLE;
memcpy(entry->last_pn, pn, CCMP_PN_LEN);
}
skb_pull(rx->skb, ieee80211_hdrlen(fc));
__skb_queue_tail(&entry->skb_list, rx->skb);
entry->last_frag = frag;
entry->extra_len += rx->skb->len;
if (ieee80211_has_morefrags(fc)) {
rx->skb = NULL;
return RX_QUEUED;
}
rx->skb = __skb_dequeue(&entry->skb_list);
if (skb_tailroom(rx->skb) < entry->extra_len) {
I802_DEBUG_INC(rx->local->rx_expand_skb_head2);
if (unlikely(pskb_expand_head(rx->skb, 0, entry->extra_len,
GFP_ATOMIC))) {
I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag);
__skb_queue_purge(&entry->skb_list);
return RX_DROP_UNUSABLE;
}
}
while ((skb = __skb_dequeue(&entry->skb_list))) {
memcpy(skb_put(rx->skb, skb->len), skb->data, skb->len);
dev_kfree_skb(skb);
}
/* Complete frame has been reassembled - process it now */
status = IEEE80211_SKB_RXCB(rx->skb);
status->rx_flags |= IEEE80211_RX_FRAGMENTED;
out:
if (rx->sta)
rx->sta->rx_packets++;
if (is_multicast_ether_addr(hdr->addr1))
rx->local->dot11MulticastReceivedFrameCount++;
else
ieee80211_led_rx(rx->local);
return RX_CONTINUE;
}
static int
ieee80211_802_1x_port_control(struct ieee80211_rx_data *rx)
{
if (unlikely(!rx->sta ||
!test_sta_flag(rx->sta, WLAN_STA_AUTHORIZED)))
return -EACCES;
return 0;
}
static int
ieee80211_drop_unencrypted(struct ieee80211_rx_data *rx, __le16 fc)
{
struct sk_buff *skb = rx->skb;
struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
/*
* Pass through unencrypted frames if the hardware has
* decrypted them already.
*/
if (status->flag & RX_FLAG_DECRYPTED)
return 0;
/* Drop unencrypted frames if key is set. */
if (unlikely(!ieee80211_has_protected(fc) &&
!ieee80211_is_nullfunc(fc) &&
ieee80211_is_data(fc) &&
(rx->key || rx->sdata->drop_unencrypted)))
return -EACCES;
return 0;
}
static int
ieee80211_drop_unencrypted_mgmt(struct ieee80211_rx_data *rx)
{
struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
__le16 fc = hdr->frame_control;
/*
* Pass through unencrypted frames if the hardware has
* decrypted them already.
*/
if (status->flag & RX_FLAG_DECRYPTED)
return 0;
if (rx->sta && test_sta_flag(rx->sta, WLAN_STA_MFP)) {
if (unlikely(!ieee80211_has_protected(fc) &&
ieee80211_is_unicast_robust_mgmt_frame(rx->skb) &&
rx->key)) {
if (ieee80211_is_deauth(fc))
cfg80211_send_unprot_deauth(rx->sdata->dev,
rx->skb->data,
rx->skb->len);
else if (ieee80211_is_disassoc(fc))
cfg80211_send_unprot_disassoc(rx->sdata->dev,
rx->skb->data,
rx->skb->len);
return -EACCES;
}
/* BIP does not use Protected field, so need to check MMIE */
if (unlikely(ieee80211_is_multicast_robust_mgmt_frame(rx->skb) &&
ieee80211_get_mmie_keyidx(rx->skb) < 0)) {
if (ieee80211_is_deauth(fc))
cfg80211_send_unprot_deauth(rx->sdata->dev,
rx->skb->data,
rx->skb->len);
else if (ieee80211_is_disassoc(fc))
cfg80211_send_unprot_disassoc(rx->sdata->dev,
rx->skb->data,
rx->skb->len);
return -EACCES;
}
/*
* When using MFP, Action frames are not allowed prior to
* having configured keys.
*/
if (unlikely(ieee80211_is_action(fc) && !rx->key &&
ieee80211_is_robust_mgmt_frame(
(struct ieee80211_hdr *) rx->skb->data)))
return -EACCES;
}
return 0;
}
static int
__ieee80211_data_to_8023(struct ieee80211_rx_data *rx, bool *port_control)
{
struct ieee80211_sub_if_data *sdata = rx->sdata;
struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
bool check_port_control = false;
struct ethhdr *ehdr;
int ret;
*port_control = false;
if (ieee80211_has_a4(hdr->frame_control) &&
sdata->vif.type == NL80211_IFTYPE_AP_VLAN && !sdata->u.vlan.sta)
return -1;
if (sdata->vif.type == NL80211_IFTYPE_STATION &&
!!sdata->u.mgd.use_4addr != !!ieee80211_has_a4(hdr->frame_control)) {
if (!sdata->u.mgd.use_4addr)
return -1;
else
check_port_control = true;
}
if (is_multicast_ether_addr(hdr->addr1) &&
sdata->vif.type == NL80211_IFTYPE_AP_VLAN && sdata->u.vlan.sta)
return -1;
ret = ieee80211_data_to_8023(rx->skb, sdata->vif.addr, sdata->vif.type);
if (ret < 0)
return ret;
ehdr = (struct ethhdr *) rx->skb->data;
if (ehdr->h_proto == rx->sdata->control_port_protocol)
*port_control = true;
else if (check_port_control)
return -1;
return 0;
}
/*
* requires that rx->skb is a frame with ethernet header
*/
static bool ieee80211_frame_allowed(struct ieee80211_rx_data *rx, __le16 fc)
{
static const u8 pae_group_addr[ETH_ALEN] __aligned(2)
= { 0x01, 0x80, 0xC2, 0x00, 0x00, 0x03 };
struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data;
/*
* Allow EAPOL frames to us/the PAE group address regardless
* of whether the frame was encrypted or not.
*/
if (ehdr->h_proto == rx->sdata->control_port_protocol &&
(compare_ether_addr(ehdr->h_dest, rx->sdata->vif.addr) == 0 ||
compare_ether_addr(ehdr->h_dest, pae_group_addr) == 0))
return true;
if (ieee80211_802_1x_port_control(rx) ||
ieee80211_drop_unencrypted(rx, fc))
return false;
return true;
}
/*
* requires that rx->skb is a frame with ethernet header
*/
static void
ieee80211_deliver_skb(struct ieee80211_rx_data *rx)
{
struct ieee80211_sub_if_data *sdata = rx->sdata;
struct net_device *dev = sdata->dev;
struct sk_buff *skb, *xmit_skb;
struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data;
struct sta_info *dsta;
struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
skb = rx->skb;
xmit_skb = NULL;
if ((sdata->vif.type == NL80211_IFTYPE_AP ||
sdata->vif.type == NL80211_IFTYPE_AP_VLAN) &&
!(sdata->flags & IEEE80211_SDATA_DONT_BRIDGE_PACKETS) &&
(status->rx_flags & IEEE80211_RX_RA_MATCH) &&
(sdata->vif.type != NL80211_IFTYPE_AP_VLAN || !sdata->u.vlan.sta)) {
if (is_multicast_ether_addr(ehdr->h_dest)) {
/*
* send multicast frames both to higher layers in
* local net stack and back to the wireless medium
*/
xmit_skb = skb_copy(skb, GFP_ATOMIC);
if (!xmit_skb && net_ratelimit())
printk(KERN_DEBUG "%s: failed to clone "
"multicast frame\n", dev->name);
} else {
dsta = sta_info_get(sdata, skb->data);
if (dsta) {
/*
* The destination station is associated to
* this AP (in this VLAN), so send the frame
* directly to it and do not pass it to local
* net stack.
*/
xmit_skb = skb;
skb = NULL;
}
}
}
if (skb) {
int align __maybe_unused;
#ifndef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS
/*
* 'align' will only take the values 0 or 2 here
* since all frames are required to be aligned
* to 2-byte boundaries when being passed to
* mac80211. That also explains the __skb_push()
* below.
*/
align = ((unsigned long)(skb->data + sizeof(struct ethhdr))) & 3;
if (align) {
if (WARN_ON(skb_headroom(skb) < 3)) {
dev_kfree_skb(skb);
skb = NULL;
} else {
u8 *data = skb->data;
size_t len = skb_headlen(skb);
skb->data -= align;
memmove(skb->data, data, len);
skb_set_tail_pointer(skb, len);
}
}
#endif
if (skb) {
/* deliver to local stack */
skb->protocol = eth_type_trans(skb, dev);
memset(skb->cb, 0, sizeof(skb->cb));
netif_receive_skb(skb);
}
}
if (xmit_skb) {
/*
* Send to wireless media and increase priority by 256 to
* keep the received priority instead of reclassifying
* the frame (see cfg80211_classify8021d).
*/
xmit_skb->priority += 256;
xmit_skb->protocol = htons(ETH_P_802_3);
skb_reset_network_header(xmit_skb);
skb_reset_mac_header(xmit_skb);
dev_queue_xmit(xmit_skb);
}
}
static ieee80211_rx_result debug_noinline
ieee80211_rx_h_amsdu(struct ieee80211_rx_data *rx)
{
struct net_device *dev = rx->sdata->dev;
struct sk_buff *skb = rx->skb;
struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
__le16 fc = hdr->frame_control;
struct sk_buff_head frame_list;
struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
if (unlikely(!ieee80211_is_data(fc)))
return RX_CONTINUE;
if (unlikely(!ieee80211_is_data_present(fc)))
return RX_DROP_MONITOR;
if (!(status->rx_flags & IEEE80211_RX_AMSDU))
return RX_CONTINUE;
if (ieee80211_has_a4(hdr->frame_control) &&
rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
!rx->sdata->u.vlan.sta)
return RX_DROP_UNUSABLE;
if (is_multicast_ether_addr(hdr->addr1) &&
((rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
rx->sdata->u.vlan.sta) ||
(rx->sdata->vif.type == NL80211_IFTYPE_STATION &&
rx->sdata->u.mgd.use_4addr)))
return RX_DROP_UNUSABLE;
skb->dev = dev;
__skb_queue_head_init(&frame_list);
if (skb_linearize(skb))
return RX_DROP_UNUSABLE;
ieee80211_amsdu_to_8023s(skb, &frame_list, dev->dev_addr,
rx->sdata->vif.type,
rx->local->hw.extra_tx_headroom, true);
while (!skb_queue_empty(&frame_list)) {
rx->skb = __skb_dequeue(&frame_list);
if (!ieee80211_frame_allowed(rx, fc)) {
dev_kfree_skb(rx->skb);
continue;
}
dev->stats.rx_packets++;
dev->stats.rx_bytes += rx->skb->len;
ieee80211_deliver_skb(rx);
}
return RX_QUEUED;
}
#ifdef CONFIG_MAC80211_MESH
static ieee80211_rx_result
ieee80211_rx_h_mesh_fwding(struct ieee80211_rx_data *rx)
{
struct ieee80211_hdr *fwd_hdr, *hdr;
struct ieee80211_tx_info *info;
struct ieee80211s_hdr *mesh_hdr;
struct sk_buff *skb = rx->skb, *fwd_skb;
struct ieee80211_local *local = rx->local;
struct ieee80211_sub_if_data *sdata = rx->sdata;
struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
__le16 reason = cpu_to_le16(WLAN_REASON_MESH_PATH_NOFORWARD);
u16 q, hdrlen;
hdr = (struct ieee80211_hdr *) skb->data;
hdrlen = ieee80211_hdrlen(hdr->frame_control);
mesh_hdr = (struct ieee80211s_hdr *) (skb->data + hdrlen);
/* frame is in RMC, don't forward */
if (ieee80211_is_data(hdr->frame_control) &&
is_multicast_ether_addr(hdr->addr1) &&
mesh_rmc_check(hdr->addr3, mesh_hdr, rx->sdata))
return RX_DROP_MONITOR;
if (!ieee80211_is_data(hdr->frame_control))
return RX_CONTINUE;
if (!mesh_hdr->ttl)
return RX_DROP_MONITOR;
if (mesh_hdr->flags & MESH_FLAGS_AE) {
struct mesh_path *mppath;
char *proxied_addr;
char *mpp_addr;
if (is_multicast_ether_addr(hdr->addr1)) {
mpp_addr = hdr->addr3;
proxied_addr = mesh_hdr->eaddr1;
} else {
mpp_addr = hdr->addr4;
proxied_addr = mesh_hdr->eaddr2;
}
rcu_read_lock();
mppath = mpp_path_lookup(proxied_addr, sdata);
if (!mppath) {
mpp_path_add(proxied_addr, mpp_addr, sdata);
} else {
spin_lock_bh(&mppath->state_lock);
if (compare_ether_addr(mppath->mpp, mpp_addr) != 0)
memcpy(mppath->mpp, mpp_addr, ETH_ALEN);
spin_unlock_bh(&mppath->state_lock);
}
rcu_read_unlock();
}
/* Frame has reached destination. Don't forward */
if (!is_multicast_ether_addr(hdr->addr1) &&
compare_ether_addr(sdata->vif.addr, hdr->addr3) == 0)
return RX_CONTINUE;
q = ieee80211_select_queue_80211(local, skb, hdr);
if (ieee80211_queue_stopped(&local->hw, q)) {
IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, dropped_frames_congestion);
return RX_DROP_MONITOR;
}
skb_set_queue_mapping(skb, q);
if (!(status->rx_flags & IEEE80211_RX_RA_MATCH))
goto out;
if (!--mesh_hdr->ttl) {
IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, dropped_frames_ttl);
return RX_DROP_MONITOR;
}
if (!ifmsh->mshcfg.dot11MeshForwarding)
goto out;
fwd_skb = skb_copy(skb, GFP_ATOMIC);
if (!fwd_skb) {
if (net_ratelimit())
printk(KERN_DEBUG "%s: failed to clone mesh frame\n",
sdata->name);
goto out;
}
fwd_hdr = (struct ieee80211_hdr *) fwd_skb->data;
info = IEEE80211_SKB_CB(fwd_skb);
memset(info, 0, sizeof(*info));
info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING;
info->control.vif = &rx->sdata->vif;
info->control.jiffies = jiffies;
if (is_multicast_ether_addr(fwd_hdr->addr1)) {
IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, fwded_mcast);
memcpy(fwd_hdr->addr2, sdata->vif.addr, ETH_ALEN);
} else if (!mesh_nexthop_lookup(fwd_skb, sdata)) {
IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, fwded_unicast);
} else {
/* unable to resolve next hop */
mesh_path_error_tx(ifmsh->mshcfg.element_ttl, fwd_hdr->addr3,
0, reason, fwd_hdr->addr2, sdata);
IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, dropped_frames_no_route);
kfree_skb(fwd_skb);
return RX_DROP_MONITOR;
}
IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, fwded_frames);
ieee80211_add_pending_skb(local, fwd_skb);
out:
if (is_multicast_ether_addr(hdr->addr1) ||
sdata->dev->flags & IFF_PROMISC)
return RX_CONTINUE;
else
return RX_DROP_MONITOR;
}
#endif
static ieee80211_rx_result debug_noinline
ieee80211_rx_h_data(struct ieee80211_rx_data *rx)
{
struct ieee80211_sub_if_data *sdata = rx->sdata;
struct ieee80211_local *local = rx->local;
struct net_device *dev = sdata->dev;
struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
__le16 fc = hdr->frame_control;
bool port_control;
int err;
if (unlikely(!ieee80211_is_data(hdr->frame_control)))
return RX_CONTINUE;
if (unlikely(!ieee80211_is_data_present(hdr->frame_control)))
return RX_DROP_MONITOR;
/*
* Send unexpected-4addr-frame event to hostapd. For older versions,
* also drop the frame to cooked monitor interfaces.
*/
if (ieee80211_has_a4(hdr->frame_control) &&
sdata->vif.type == NL80211_IFTYPE_AP) {
if (rx->sta &&
!test_and_set_sta_flag(rx->sta, WLAN_STA_4ADDR_EVENT))
cfg80211_rx_unexpected_4addr_frame(
rx->sdata->dev, rx->sta->sta.addr, GFP_ATOMIC);
return RX_DROP_MONITOR;
}
err = __ieee80211_data_to_8023(rx, &port_control);
if (unlikely(err))
return RX_DROP_UNUSABLE;
if (!ieee80211_frame_allowed(rx, fc))
return RX_DROP_MONITOR;
if (rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
unlikely(port_control) && sdata->bss) {
sdata = container_of(sdata->bss, struct ieee80211_sub_if_data,
u.ap);
dev = sdata->dev;
rx->sdata = sdata;
}
rx->skb->dev = dev;
dev->stats.rx_packets++;
dev->stats.rx_bytes += rx->skb->len;
if (local->ps_sdata && local->hw.conf.dynamic_ps_timeout > 0 &&
!is_multicast_ether_addr(
((struct ethhdr *)rx->skb->data)->h_dest) &&
(!local->scanning &&
!test_bit(SDATA_STATE_OFFCHANNEL, &sdata->state))) {
mod_timer(&local->dynamic_ps_timer, jiffies +
msecs_to_jiffies(local->hw.conf.dynamic_ps_timeout));
}
ieee80211_deliver_skb(rx);
return RX_QUEUED;
}
static ieee80211_rx_result debug_noinline
ieee80211_rx_h_ctrl(struct ieee80211_rx_data *rx)
{
struct ieee80211_local *local = rx->local;
struct ieee80211_hw *hw = &local->hw;
struct sk_buff *skb = rx->skb;
struct ieee80211_bar *bar = (struct ieee80211_bar *)skb->data;
struct tid_ampdu_rx *tid_agg_rx;
u16 start_seq_num;
u16 tid;
if (likely(!ieee80211_is_ctl(bar->frame_control)))
return RX_CONTINUE;
if (ieee80211_is_back_req(bar->frame_control)) {
struct {
__le16 control, start_seq_num;
} __packed bar_data;
if (!rx->sta)
return RX_DROP_MONITOR;
if (skb_copy_bits(skb, offsetof(struct ieee80211_bar, control),
&bar_data, sizeof(bar_data)))
return RX_DROP_MONITOR;
tid = le16_to_cpu(bar_data.control) >> 12;
tid_agg_rx = rcu_dereference(rx->sta->ampdu_mlme.tid_rx[tid]);
if (!tid_agg_rx)
return RX_DROP_MONITOR;
start_seq_num = le16_to_cpu(bar_data.start_seq_num) >> 4;
/* reset session timer */
if (tid_agg_rx->timeout)
mod_timer(&tid_agg_rx->session_timer,
TU_TO_EXP_TIME(tid_agg_rx->timeout));
spin_lock(&tid_agg_rx->reorder_lock);
/* release stored frames up to start of BAR */
ieee80211_release_reorder_frames(hw, tid_agg_rx, start_seq_num);
spin_unlock(&tid_agg_rx->reorder_lock);
kfree_skb(skb);
return RX_QUEUED;
}
/*
* After this point, we only want management frames,
* so we can drop all remaining control frames to
* cooked monitor interfaces.
*/
return RX_DROP_MONITOR;
}
static void ieee80211_process_sa_query_req(struct ieee80211_sub_if_data *sdata,
struct ieee80211_mgmt *mgmt,
size_t len)
{
struct ieee80211_local *local = sdata->local;
struct sk_buff *skb;
struct ieee80211_mgmt *resp;
if (compare_ether_addr(mgmt->da, sdata->vif.addr) != 0) {
/* Not to own unicast address */
return;
}
if (compare_ether_addr(mgmt->sa, sdata->u.mgd.bssid) != 0 ||
compare_ether_addr(mgmt->bssid, sdata->u.mgd.bssid) != 0) {
/* Not from the current AP or not associated yet. */
return;
}
if (len < 24 + 1 + sizeof(resp->u.action.u.sa_query)) {
/* Too short SA Query request frame */
return;
}
skb = dev_alloc_skb(sizeof(*resp) + local->hw.extra_tx_headroom);
if (skb == NULL)
return;
skb_reserve(skb, local->hw.extra_tx_headroom);
resp = (struct ieee80211_mgmt *) skb_put(skb, 24);
memset(resp, 0, 24);
memcpy(resp->da, mgmt->sa, ETH_ALEN);
memcpy(resp->sa, sdata->vif.addr, ETH_ALEN);
memcpy(resp->bssid, sdata->u.mgd.bssid, ETH_ALEN);
resp->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
IEEE80211_STYPE_ACTION);
skb_put(skb, 1 + sizeof(resp->u.action.u.sa_query));
resp->u.action.category = WLAN_CATEGORY_SA_QUERY;
resp->u.action.u.sa_query.action = WLAN_ACTION_SA_QUERY_RESPONSE;
memcpy(resp->u.action.u.sa_query.trans_id,
mgmt->u.action.u.sa_query.trans_id,
WLAN_SA_QUERY_TR_ID_LEN);
ieee80211_tx_skb(sdata, skb);
}
static ieee80211_rx_result debug_noinline
ieee80211_rx_h_mgmt_check(struct ieee80211_rx_data *rx)
{
struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
/*
* From here on, look only at management frames.
* Data and control frames are already handled,
* and unknown (reserved) frames are useless.
*/
if (rx->skb->len < 24)
return RX_DROP_MONITOR;
if (!ieee80211_is_mgmt(mgmt->frame_control))
return RX_DROP_MONITOR;
if (rx->sdata->vif.type == NL80211_IFTYPE_AP &&
ieee80211_is_beacon(mgmt->frame_control) &&
!(rx->flags & IEEE80211_RX_BEACON_REPORTED)) {
int sig = 0;
if (rx->local->hw.flags & IEEE80211_HW_SIGNAL_DBM)
sig = status->signal;
cfg80211_report_obss_beacon(rx->local->hw.wiphy,
rx->skb->data, rx->skb->len,
status->freq, sig, GFP_ATOMIC);
rx->flags |= IEEE80211_RX_BEACON_REPORTED;
}
if (!(status->rx_flags & IEEE80211_RX_RA_MATCH))
return RX_DROP_MONITOR;
if (ieee80211_drop_unencrypted_mgmt(rx))
return RX_DROP_UNUSABLE;
return RX_CONTINUE;
}
static ieee80211_rx_result debug_noinline
ieee80211_rx_h_action(struct ieee80211_rx_data *rx)
{
struct ieee80211_local *local = rx->local;
struct ieee80211_sub_if_data *sdata = rx->sdata;
struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
int len = rx->skb->len;
if (!ieee80211_is_action(mgmt->frame_control))
return RX_CONTINUE;
/* drop too small frames */
if (len < IEEE80211_MIN_ACTION_SIZE)
return RX_DROP_UNUSABLE;
if (!rx->sta && mgmt->u.action.category != WLAN_CATEGORY_PUBLIC)
return RX_DROP_UNUSABLE;
if (!(status->rx_flags & IEEE80211_RX_RA_MATCH))
return RX_DROP_UNUSABLE;
switch (mgmt->u.action.category) {
case WLAN_CATEGORY_HT:
/* reject HT action frames from stations not supporting HT */
if (!rx->sta->sta.ht_cap.ht_supported)
goto invalid;
if (sdata->vif.type != NL80211_IFTYPE_STATION &&
sdata->vif.type != NL80211_IFTYPE_MESH_POINT &&
sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
sdata->vif.type != NL80211_IFTYPE_AP &&
sdata->vif.type != NL80211_IFTYPE_ADHOC)
break;
/* verify action & smps_control are present */
if (len < IEEE80211_MIN_ACTION_SIZE + 2)
goto invalid;
switch (mgmt->u.action.u.ht_smps.action) {
case WLAN_HT_ACTION_SMPS: {
struct ieee80211_supported_band *sband;
u8 smps;
/* convert to HT capability */
switch (mgmt->u.action.u.ht_smps.smps_control) {
case WLAN_HT_SMPS_CONTROL_DISABLED:
smps = WLAN_HT_CAP_SM_PS_DISABLED;
break;
case WLAN_HT_SMPS_CONTROL_STATIC:
smps = WLAN_HT_CAP_SM_PS_STATIC;
break;
case WLAN_HT_SMPS_CONTROL_DYNAMIC:
smps = WLAN_HT_CAP_SM_PS_DYNAMIC;
break;
default:
goto invalid;
}
smps <<= IEEE80211_HT_CAP_SM_PS_SHIFT;
/* if no change do nothing */
if ((rx->sta->sta.ht_cap.cap &
IEEE80211_HT_CAP_SM_PS) == smps)
goto handled;
rx->sta->sta.ht_cap.cap &= ~IEEE80211_HT_CAP_SM_PS;
rx->sta->sta.ht_cap.cap |= smps;
sband = rx->local->hw.wiphy->bands[status->band];
rate_control_rate_update(
local, sband, rx->sta,
IEEE80211_RC_SMPS_CHANGED,
ieee80211_get_tx_channel_type(
local, local->_oper_channel_type));
goto handled;
}
default:
goto invalid;
}
break;
case WLAN_CATEGORY_BACK:
if (sdata->vif.type != NL80211_IFTYPE_STATION &&
sdata->vif.type != NL80211_IFTYPE_MESH_POINT &&
sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
sdata->vif.type != NL80211_IFTYPE_AP &&
sdata->vif.type != NL80211_IFTYPE_ADHOC)
break;
/* verify action_code is present */
if (len < IEEE80211_MIN_ACTION_SIZE + 1)
break;
switch (mgmt->u.action.u.addba_req.action_code) {
case WLAN_ACTION_ADDBA_REQ:
if (len < (IEEE80211_MIN_ACTION_SIZE +
sizeof(mgmt->u.action.u.addba_req)))
goto invalid;
break;
case WLAN_ACTION_ADDBA_RESP:
if (len < (IEEE80211_MIN_ACTION_SIZE +
sizeof(mgmt->u.action.u.addba_resp)))
goto invalid;
break;
case WLAN_ACTION_DELBA:
if (len < (IEEE80211_MIN_ACTION_SIZE +
sizeof(mgmt->u.action.u.delba)))
goto invalid;
break;
default:
goto invalid;
}
goto queue;
case WLAN_CATEGORY_SPECTRUM_MGMT:
if (local->hw.conf.channel->band != IEEE80211_BAND_5GHZ)
break;
if (sdata->vif.type != NL80211_IFTYPE_STATION)
break;
/* verify action_code is present */
if (len < IEEE80211_MIN_ACTION_SIZE + 1)
break;
switch (mgmt->u.action.u.measurement.action_code) {
case WLAN_ACTION_SPCT_MSR_REQ:
if (len < (IEEE80211_MIN_ACTION_SIZE +
sizeof(mgmt->u.action.u.measurement)))
break;
ieee80211_process_measurement_req(sdata, mgmt, len);
goto handled;
case WLAN_ACTION_SPCT_CHL_SWITCH:
if (len < (IEEE80211_MIN_ACTION_SIZE +
sizeof(mgmt->u.action.u.chan_switch)))
break;
if (sdata->vif.type != NL80211_IFTYPE_STATION)
break;
if (compare_ether_addr(mgmt->bssid, sdata->u.mgd.bssid))
break;
goto queue;
}
break;
case WLAN_CATEGORY_SA_QUERY:
if (len < (IEEE80211_MIN_ACTION_SIZE +
sizeof(mgmt->u.action.u.sa_query)))
break;
switch (mgmt->u.action.u.sa_query.action) {
case WLAN_ACTION_SA_QUERY_REQUEST:
if (sdata->vif.type != NL80211_IFTYPE_STATION)
break;
ieee80211_process_sa_query_req(sdata, mgmt, len);
goto handled;
}
break;
case WLAN_CATEGORY_SELF_PROTECTED:
switch (mgmt->u.action.u.self_prot.action_code) {
case WLAN_SP_MESH_PEERING_OPEN:
case WLAN_SP_MESH_PEERING_CLOSE:
case WLAN_SP_MESH_PEERING_CONFIRM:
if (!ieee80211_vif_is_mesh(&sdata->vif))
goto invalid;
if (sdata->u.mesh.security != IEEE80211_MESH_SEC_NONE)
/* userspace handles this frame */
break;
goto queue;
case WLAN_SP_MGK_INFORM:
case WLAN_SP_MGK_ACK:
if (!ieee80211_vif_is_mesh(&sdata->vif))
goto invalid;
break;
}
break;
case WLAN_CATEGORY_MESH_ACTION:
if (!ieee80211_vif_is_mesh(&sdata->vif))
break;
if (mesh_action_is_path_sel(mgmt) &&
(!mesh_path_sel_is_hwmp(sdata)))
break;
goto queue;
}
return RX_CONTINUE;
invalid:
status->rx_flags |= IEEE80211_RX_MALFORMED_ACTION_FRM;
/* will return in the next handlers */
return RX_CONTINUE;
handled:
if (rx->sta)
rx->sta->rx_packets++;
dev_kfree_skb(rx->skb);
return RX_QUEUED;
queue:
rx->skb->pkt_type = IEEE80211_SDATA_QUEUE_TYPE_FRAME;
skb_queue_tail(&sdata->skb_queue, rx->skb);
ieee80211_queue_work(&local->hw, &sdata->work);
if (rx->sta)
rx->sta->rx_packets++;
return RX_QUEUED;
}
static ieee80211_rx_result debug_noinline
ieee80211_rx_h_userspace_mgmt(struct ieee80211_rx_data *rx)
{
struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
int sig = 0;
/* skip known-bad action frames and return them in the next handler */
if (status->rx_flags & IEEE80211_RX_MALFORMED_ACTION_FRM)
return RX_CONTINUE;
/*
* Getting here means the kernel doesn't know how to handle
* it, but maybe userspace does ... include returned frames
* so userspace can register for those to know whether ones
* it transmitted were processed or returned.
*/
if (rx->local->hw.flags & IEEE80211_HW_SIGNAL_DBM)
sig = status->signal;
if (cfg80211_rx_mgmt(rx->sdata->dev, status->freq, sig,
rx->skb->data, rx->skb->len,
GFP_ATOMIC)) {
if (rx->sta)
rx->sta->rx_packets++;
dev_kfree_skb(rx->skb);
return RX_QUEUED;
}
return RX_CONTINUE;
}
static ieee80211_rx_result debug_noinline
ieee80211_rx_h_action_return(struct ieee80211_rx_data *rx)
{
struct ieee80211_local *local = rx->local;
struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
struct sk_buff *nskb;
struct ieee80211_sub_if_data *sdata = rx->sdata;
struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
if (!ieee80211_is_action(mgmt->frame_control))
return RX_CONTINUE;
/*
* For AP mode, hostapd is responsible for handling any action
* frames that we didn't handle, including returning unknown
* ones. For all other modes we will return them to the sender,
* setting the 0x80 bit in the action category, as required by
* 802.11-2007 7.3.1.11.
* Newer versions of hostapd shall also use the management frame
* registration mechanisms, but older ones still use cooked
* monitor interfaces so push all frames there.
*/
if (!(status->rx_flags & IEEE80211_RX_MALFORMED_ACTION_FRM) &&
(sdata->vif.type == NL80211_IFTYPE_AP ||
sdata->vif.type == NL80211_IFTYPE_AP_VLAN))
return RX_DROP_MONITOR;
/* do not return rejected action frames */
if (mgmt->u.action.category & 0x80)
return RX_DROP_UNUSABLE;
nskb = skb_copy_expand(rx->skb, local->hw.extra_tx_headroom, 0,
GFP_ATOMIC);
if (nskb) {
struct ieee80211_mgmt *nmgmt = (void *)nskb->data;
nmgmt->u.action.category |= 0x80;
memcpy(nmgmt->da, nmgmt->sa, ETH_ALEN);
memcpy(nmgmt->sa, rx->sdata->vif.addr, ETH_ALEN);
memset(nskb->cb, 0, sizeof(nskb->cb));
ieee80211_tx_skb(rx->sdata, nskb);
}
dev_kfree_skb(rx->skb);
return RX_QUEUED;
}
static ieee80211_rx_result debug_noinline
ieee80211_rx_h_mgmt(struct ieee80211_rx_data *rx)
{
struct ieee80211_sub_if_data *sdata = rx->sdata;
struct ieee80211_mgmt *mgmt = (void *)rx->skb->data;
__le16 stype;
stype = mgmt->frame_control & cpu_to_le16(IEEE80211_FCTL_STYPE);
if (!ieee80211_vif_is_mesh(&sdata->vif) &&
sdata->vif.type != NL80211_IFTYPE_ADHOC &&
sdata->vif.type != NL80211_IFTYPE_STATION)
return RX_DROP_MONITOR;
switch (stype) {
case cpu_to_le16(IEEE80211_STYPE_AUTH):
case cpu_to_le16(IEEE80211_STYPE_BEACON):
case cpu_to_le16(IEEE80211_STYPE_PROBE_RESP):
/* process for all: mesh, mlme, ibss */
break;
case cpu_to_le16(IEEE80211_STYPE_ASSOC_RESP):
case cpu_to_le16(IEEE80211_STYPE_REASSOC_RESP):
case cpu_to_le16(IEEE80211_STYPE_DEAUTH):
case cpu_to_le16(IEEE80211_STYPE_DISASSOC):
if (is_multicast_ether_addr(mgmt->da) &&
!is_broadcast_ether_addr(mgmt->da))
return RX_DROP_MONITOR;
/* process only for station */
if (sdata->vif.type != NL80211_IFTYPE_STATION)
return RX_DROP_MONITOR;
break;
case cpu_to_le16(IEEE80211_STYPE_PROBE_REQ):
/* process only for ibss */
if (sdata->vif.type != NL80211_IFTYPE_ADHOC)
return RX_DROP_MONITOR;
break;
default:
return RX_DROP_MONITOR;
}
/* queue up frame and kick off work to process it */
rx->skb->pkt_type = IEEE80211_SDATA_QUEUE_TYPE_FRAME;
skb_queue_tail(&sdata->skb_queue, rx->skb);
ieee80211_queue_work(&rx->local->hw, &sdata->work);
if (rx->sta)
rx->sta->rx_packets++;
return RX_QUEUED;
}
/* TODO: use IEEE80211_RX_FRAGMENTED */
static void ieee80211_rx_cooked_monitor(struct ieee80211_rx_data *rx,
struct ieee80211_rate *rate)
{
struct ieee80211_sub_if_data *sdata;
struct ieee80211_local *local = rx->local;
struct sk_buff *skb = rx->skb, *skb2;
struct net_device *prev_dev = NULL;
struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
int needed_headroom;
/*
* If cooked monitor has been processed already, then
* don't do it again. If not, set the flag.
*/
if (rx->flags & IEEE80211_RX_CMNTR)
goto out_free_skb;
rx->flags |= IEEE80211_RX_CMNTR;
/* If there are no cooked monitor interfaces, just free the SKB */
if (!local->cooked_mntrs)
goto out_free_skb;
/* room for the radiotap header based on driver features */
needed_headroom = ieee80211_rx_radiotap_len(local, status);
if (skb_headroom(skb) < needed_headroom &&
pskb_expand_head(skb, needed_headroom, 0, GFP_ATOMIC))
goto out_free_skb;
/* prepend radiotap information */
ieee80211_add_rx_radiotap_header(local, skb, rate, needed_headroom);
skb_set_mac_header(skb, 0);
skb->ip_summed = CHECKSUM_UNNECESSARY;
skb->pkt_type = PACKET_OTHERHOST;
skb->protocol = htons(ETH_P_802_2);
list_for_each_entry_rcu(sdata, &local->interfaces, list) {
if (!ieee80211_sdata_running(sdata))
continue;
if (sdata->vif.type != NL80211_IFTYPE_MONITOR ||
!(sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES))
continue;
if (prev_dev) {
skb2 = skb_clone(skb, GFP_ATOMIC);
if (skb2) {
skb2->dev = prev_dev;
netif_receive_skb(skb2);
}
}
prev_dev = sdata->dev;
sdata->dev->stats.rx_packets++;
sdata->dev->stats.rx_bytes += skb->len;
}
if (prev_dev) {
skb->dev = prev_dev;
netif_receive_skb(skb);
return;
}
out_free_skb:
dev_kfree_skb(skb);
}
static void ieee80211_rx_handlers_result(struct ieee80211_rx_data *rx,
ieee80211_rx_result res)
{
switch (res) {
case RX_DROP_MONITOR:
I802_DEBUG_INC(rx->sdata->local->rx_handlers_drop);
if (rx->sta)
rx->sta->rx_dropped++;
/* fall through */
case RX_CONTINUE: {
struct ieee80211_rate *rate = NULL;
struct ieee80211_supported_band *sband;
struct ieee80211_rx_status *status;
status = IEEE80211_SKB_RXCB((rx->skb));
sband = rx->local->hw.wiphy->bands[status->band];
if (!(status->flag & RX_FLAG_HT))
rate = &sband->bitrates[status->rate_idx];
ieee80211_rx_cooked_monitor(rx, rate);
break;
}
case RX_DROP_UNUSABLE:
I802_DEBUG_INC(rx->sdata->local->rx_handlers_drop);
if (rx->sta)
rx->sta->rx_dropped++;
dev_kfree_skb(rx->skb);
break;
case RX_QUEUED:
I802_DEBUG_INC(rx->sdata->local->rx_handlers_queued);
break;
}
}
static void ieee80211_rx_handlers(struct ieee80211_rx_data *rx)
{
ieee80211_rx_result res = RX_DROP_MONITOR;
struct sk_buff *skb;
#define CALL_RXH(rxh) \
do { \
res = rxh(rx); \
if (res != RX_CONTINUE) \
goto rxh_next; \
} while (0);
spin_lock(&rx->local->rx_skb_queue.lock);
if (rx->local->running_rx_handler)
goto unlock;
rx->local->running_rx_handler = true;
while ((skb = __skb_dequeue(&rx->local->rx_skb_queue))) {
spin_unlock(&rx->local->rx_skb_queue.lock);
/*
* all the other fields are valid across frames
* that belong to an aMPDU since they are on the
* same TID from the same station
*/
rx->skb = skb;
CALL_RXH(ieee80211_rx_h_decrypt)
CALL_RXH(ieee80211_rx_h_check_more_data)
CALL_RXH(ieee80211_rx_h_uapsd_and_pspoll)
CALL_RXH(ieee80211_rx_h_sta_process)
CALL_RXH(ieee80211_rx_h_defragment)
CALL_RXH(ieee80211_rx_h_michael_mic_verify)
/* must be after MMIC verify so header is counted in MPDU mic */
#ifdef CONFIG_MAC80211_MESH
if (ieee80211_vif_is_mesh(&rx->sdata->vif))
CALL_RXH(ieee80211_rx_h_mesh_fwding);
#endif
CALL_RXH(ieee80211_rx_h_amsdu)
CALL_RXH(ieee80211_rx_h_data)
CALL_RXH(ieee80211_rx_h_ctrl);
CALL_RXH(ieee80211_rx_h_mgmt_check)
CALL_RXH(ieee80211_rx_h_action)
CALL_RXH(ieee80211_rx_h_userspace_mgmt)
CALL_RXH(ieee80211_rx_h_action_return)
CALL_RXH(ieee80211_rx_h_mgmt)
rxh_next:
ieee80211_rx_handlers_result(rx, res);
spin_lock(&rx->local->rx_skb_queue.lock);
#undef CALL_RXH
}
rx->local->running_rx_handler = false;
unlock:
spin_unlock(&rx->local->rx_skb_queue.lock);
}
static void ieee80211_invoke_rx_handlers(struct ieee80211_rx_data *rx)
{
ieee80211_rx_result res = RX_DROP_MONITOR;
#define CALL_RXH(rxh) \
do { \
res = rxh(rx); \
if (res != RX_CONTINUE) \
goto rxh_next; \
} while (0);
CALL_RXH(ieee80211_rx_h_passive_scan)
CALL_RXH(ieee80211_rx_h_check)
ieee80211_rx_reorder_ampdu(rx);
ieee80211_rx_handlers(rx);
return;
rxh_next:
ieee80211_rx_handlers_result(rx, res);
#undef CALL_RXH
}
/*
* This function makes calls into the RX path, therefore
* it has to be invoked under RCU read lock.
*/
void ieee80211_release_reorder_timeout(struct sta_info *sta, int tid)
{
struct ieee80211_rx_data rx = {
.sta = sta,
.sdata = sta->sdata,
.local = sta->local,
/* This is OK -- must be QoS data frame */
.security_idx = tid,
.seqno_idx = tid,
.flags = 0,
};
struct tid_ampdu_rx *tid_agg_rx;
tid_agg_rx = rcu_dereference(sta->ampdu_mlme.tid_rx[tid]);
if (!tid_agg_rx)
return;
spin_lock(&tid_agg_rx->reorder_lock);
ieee80211_sta_reorder_release(&sta->local->hw, tid_agg_rx);
spin_unlock(&tid_agg_rx->reorder_lock);
ieee80211_rx_handlers(&rx);
}
/* main receive path */
static int prepare_for_handlers(struct ieee80211_rx_data *rx,
struct ieee80211_hdr *hdr)
{
struct ieee80211_sub_if_data *sdata = rx->sdata;
struct sk_buff *skb = rx->skb;
struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
u8 *bssid = ieee80211_get_bssid(hdr, skb->len, sdata->vif.type);
int multicast = is_multicast_ether_addr(hdr->addr1);
switch (sdata->vif.type) {
case NL80211_IFTYPE_STATION:
if (!bssid && !sdata->u.mgd.use_4addr)
return 0;
if (!multicast &&
compare_ether_addr(sdata->vif.addr, hdr->addr1) != 0) {
if (!(sdata->dev->flags & IFF_PROMISC) ||
sdata->u.mgd.use_4addr)
return 0;
status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
}
break;
case NL80211_IFTYPE_ADHOC:
if (!bssid)
return 0;
if (ieee80211_is_beacon(hdr->frame_control)) {
return 1;
}
else if (!ieee80211_bssid_match(bssid, sdata->u.ibss.bssid)) {
if (!(status->rx_flags & IEEE80211_RX_IN_SCAN))
return 0;
status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
} else if (!multicast &&
compare_ether_addr(sdata->vif.addr,
hdr->addr1) != 0) {
if (!(sdata->dev->flags & IFF_PROMISC))
return 0;
status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
} else if (!rx->sta) {
int rate_idx;
if (status->flag & RX_FLAG_HT)
rate_idx = 0; /* TODO: HT rates */
else
rate_idx = status->rate_idx;
ieee80211_ibss_rx_no_sta(sdata, bssid, hdr->addr2,
BIT(rate_idx));
}
break;
case NL80211_IFTYPE_MESH_POINT:
if (!multicast &&
compare_ether_addr(sdata->vif.addr,
hdr->addr1) != 0) {
if (!(sdata->dev->flags & IFF_PROMISC))
return 0;
status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
}
break;
case NL80211_IFTYPE_AP_VLAN:
case NL80211_IFTYPE_AP:
if (!bssid) {
if (compare_ether_addr(sdata->vif.addr,
hdr->addr1))
return 0;
} else if (!ieee80211_bssid_match(bssid,
sdata->vif.addr)) {
/*
* Accept public action frames even when the
* BSSID doesn't match, this is used for P2P
* and location updates. Note that mac80211
* itself never looks at these frames.
*/
if (!(status->rx_flags & IEEE80211_RX_IN_SCAN) &&
ieee80211_is_public_action(hdr, skb->len))
return 1;
if (!(status->rx_flags & IEEE80211_RX_IN_SCAN) &&
!ieee80211_is_beacon(hdr->frame_control))
return 0;
status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
}
break;
case NL80211_IFTYPE_WDS:
if (bssid || !ieee80211_is_data(hdr->frame_control))
return 0;
if (compare_ether_addr(sdata->u.wds.remote_addr, hdr->addr2))
return 0;
break;
default:
/* should never get here */
WARN_ON(1);
break;
}
return 1;
}
/*
* This function returns whether or not the SKB
* was destined for RX processing or not, which,
* if consume is true, is equivalent to whether
* or not the skb was consumed.
*/
static bool ieee80211_prepare_and_rx_handle(struct ieee80211_rx_data *rx,
struct sk_buff *skb, bool consume)
{
struct ieee80211_local *local = rx->local;
struct ieee80211_sub_if_data *sdata = rx->sdata;
struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
struct ieee80211_hdr *hdr = (void *)skb->data;
int prepares;
rx->skb = skb;
status->rx_flags |= IEEE80211_RX_RA_MATCH;
prepares = prepare_for_handlers(rx, hdr);
if (!prepares)
return false;
if (!consume) {
skb = skb_copy(skb, GFP_ATOMIC);
if (!skb) {
if (net_ratelimit())
wiphy_debug(local->hw.wiphy,
"failed to copy skb for %s\n",
sdata->name);
return true;
}
rx->skb = skb;
}
ieee80211_invoke_rx_handlers(rx);
return true;
}
/*
* This is the actual Rx frames handler. as it blongs to Rx path it must
* be called with rcu_read_lock protection.
*/
static void __ieee80211_rx_handle_packet(struct ieee80211_hw *hw,
struct sk_buff *skb)
{
struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
struct ieee80211_local *local = hw_to_local(hw);
struct ieee80211_sub_if_data *sdata;
struct ieee80211_hdr *hdr;
__le16 fc;
struct ieee80211_rx_data rx;
struct ieee80211_sub_if_data *prev;
struct sta_info *sta, *tmp, *prev_sta;
int err = 0;
fc = ((struct ieee80211_hdr *)skb->data)->frame_control;
memset(&rx, 0, sizeof(rx));
rx.skb = skb;
rx.local = local;
if (ieee80211_is_data(fc) || ieee80211_is_mgmt(fc))
local->dot11ReceivedFragmentCount++;
if (unlikely(test_bit(SCAN_HW_SCANNING, &local->scanning) ||
test_bit(SCAN_SW_SCANNING, &local->scanning)))
status->rx_flags |= IEEE80211_RX_IN_SCAN;
if (ieee80211_is_mgmt(fc))
err = skb_linearize(skb);
else
err = !pskb_may_pull(skb, ieee80211_hdrlen(fc));
if (err) {
dev_kfree_skb(skb);
return;
}
hdr = (struct ieee80211_hdr *)skb->data;
ieee80211_parse_qos(&rx);
ieee80211_verify_alignment(&rx);
if (ieee80211_is_data(fc)) {
prev_sta = NULL;
for_each_sta_info(local, hdr->addr2, sta, tmp) {
if (!prev_sta) {
prev_sta = sta;
continue;
}
rx.sta = prev_sta;
rx.sdata = prev_sta->sdata;
ieee80211_prepare_and_rx_handle(&rx, skb, false);
prev_sta = sta;
}
if (prev_sta) {
rx.sta = prev_sta;
rx.sdata = prev_sta->sdata;
if (ieee80211_prepare_and_rx_handle(&rx, skb, true))
return;
goto out;
}
}
prev = NULL;
list_for_each_entry_rcu(sdata, &local->interfaces, list) {
if (!ieee80211_sdata_running(sdata))
continue;
if (sdata->vif.type == NL80211_IFTYPE_MONITOR ||
sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
continue;
/*
* frame is destined for this interface, but if it's
* not also for the previous one we handle that after
* the loop to avoid copying the SKB once too much
*/
if (!prev) {
prev = sdata;
continue;
}
rx.sta = sta_info_get_bss(prev, hdr->addr2);
rx.sdata = prev;
ieee80211_prepare_and_rx_handle(&rx, skb, false);
prev = sdata;
}
if (prev) {
rx.sta = sta_info_get_bss(prev, hdr->addr2);
rx.sdata = prev;
if (ieee80211_prepare_and_rx_handle(&rx, skb, true))
return;
}
out:
dev_kfree_skb(skb);
}
/*
* This is the receive path handler. It is called by a low level driver when an
* 802.11 MPDU is received from the hardware.
*/
void ieee80211_rx(struct ieee80211_hw *hw, struct sk_buff *skb)
{
struct ieee80211_local *local = hw_to_local(hw);
struct ieee80211_rate *rate = NULL;
struct ieee80211_supported_band *sband;
struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
WARN_ON_ONCE(softirq_count() == 0);
if (WARN_ON(status->band < 0 ||
status->band >= IEEE80211_NUM_BANDS))
goto drop;
sband = local->hw.wiphy->bands[status->band];
if (WARN_ON(!sband))
goto drop;
/*
* If we're suspending, it is possible although not too likely
* that we'd be receiving frames after having already partially
* quiesced the stack. We can't process such frames then since
* that might, for example, cause stations to be added or other
* driver callbacks be invoked.
*/
if (unlikely(local->quiescing || local->suspended))
goto drop;
/*
* The same happens when we're not even started,
* but that's worth a warning.
*/
if (WARN_ON(!local->started))
goto drop;
if (likely(!(status->flag & RX_FLAG_FAILED_PLCP_CRC))) {
/*
* Validate the rate, unless a PLCP error means that
* we probably can't have a valid rate here anyway.
*/
if (status->flag & RX_FLAG_HT) {
/*
* rate_idx is MCS index, which can be [0-76]
* as documented on:
*
* http://wireless.kernel.org/en/developers/Documentation/ieee80211/802.11n
*
* Anything else would be some sort of driver or
* hardware error. The driver should catch hardware
* errors.
*/
if (WARN((status->rate_idx < 0 ||
status->rate_idx > 76),
"Rate marked as an HT rate but passed "
"status->rate_idx is not "
"an MCS index [0-76]: %d (0x%02x)\n",
status->rate_idx,
status->rate_idx))
goto drop;
} else {
if (WARN_ON(status->rate_idx < 0 ||
status->rate_idx >= sband->n_bitrates))
goto drop;
rate = &sband->bitrates[status->rate_idx];
}
}
status->rx_flags = 0;
/*
* key references and virtual interfaces are protected using RCU
* and this requires that we are in a read-side RCU section during
* receive processing
*/
rcu_read_lock();
/*
* Frames with failed FCS/PLCP checksum are not returned,
* all other frames are returned without radiotap header
* if it was previously present.
* Also, frames with less than 16 bytes are dropped.
*/
skb = ieee80211_rx_monitor(local, skb, rate);
if (!skb) {
rcu_read_unlock();
return;
}
ieee80211_tpt_led_trig_rx(local,
((struct ieee80211_hdr *)skb->data)->frame_control,
skb->len);
__ieee80211_rx_handle_packet(hw, skb);
rcu_read_unlock();
return;
drop:
kfree_skb(skb);
}
EXPORT_SYMBOL(ieee80211_rx);
/* This is a version of the rx handler that can be called from hard irq
* context. Post the skb on the queue and schedule the tasklet */
void ieee80211_rx_irqsafe(struct ieee80211_hw *hw, struct sk_buff *skb)
{
struct ieee80211_local *local = hw_to_local(hw);
BUILD_BUG_ON(sizeof(struct ieee80211_rx_status) > sizeof(skb->cb));
skb->pkt_type = IEEE80211_RX_MSG;
skb_queue_tail(&local->skb_queue, skb);
tasklet_schedule(&local->tasklet);
}
EXPORT_SYMBOL(ieee80211_rx_irqsafe);
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