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linux-next/net/mac80211/rx.c
Denis Kenzior 018f6fbf54 mac80211: Send control port frames over nl80211 
If userspace requested control port frames to go over 80211, then do so.
The control packets are intercepted just prior to delivery of the packet
to the underlying network device.

Pre-authentication type frames (protocol: 0x88c7) are also forwarded
over nl80211.

Signed-off-by: Denis Kenzior <denkenz@gmail.com>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
2018-03-29 14:08:30 +02:00

4449 lines
123 KiB
C
Raw Blame History

/*
* Copyright 2002-2005, Instant802 Networks, Inc.
* Copyright 2005-2006, Devicescape Software, Inc.
* Copyright 2006-2007 Jiri Benc <jbenc@suse.cz>
* Copyright 2007-2010 Johannes Berg <johannes@sipsolutions.net>
* Copyright 2013-2014 Intel Mobile Communications GmbH
* Copyright(c) 2015 - 2017 Intel Deutschland GmbH
*
* 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 <linux/bitops.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"
static inline void ieee80211_rx_stats(struct net_device *dev, u32 len)
{
struct pcpu_sw_netstats *tstats = this_cpu_ptr(dev->tstats);
u64_stats_update_begin(&tstats->syncp);
tstats->rx_packets++;
tstats->rx_bytes += len;
u64_stats_update_end(&tstats->syncp);
}
static u8 *ieee80211_get_bssid(struct ieee80211_hdr *hdr, size_t len,
enum nl80211_iftype type)
{
__le16 fc = hdr->frame_control;
if (ieee80211_is_data(fc)) {
if (len < 24) /* drop incorrect hdr len (data) */
return NULL;
if (ieee80211_has_a4(fc))
return NULL;
if (ieee80211_has_tods(fc))
return hdr->addr1;
if (ieee80211_has_fromds(fc))
return hdr->addr2;
return hdr->addr3;
}
if (ieee80211_is_mgmt(fc)) {
if (len < 24) /* drop incorrect hdr len (mgmt) */
return NULL;
return hdr->addr3;
}
if (ieee80211_is_ctl(fc)) {
if (ieee80211_is_pspoll(fc))
return hdr->addr1;
if (ieee80211_is_back_req(fc)) {
switch (type) {
case NL80211_IFTYPE_STATION:
return hdr->addr2;
case NL80211_IFTYPE_AP:
case NL80211_IFTYPE_AP_VLAN:
return hdr->addr1;
default:
break; /* fall through to the return */
}
}
}
return NULL;
}
/*
* monitor mode reception
*
* This function cleans up the SKB, i.e. it removes all the stuff
* only useful for monitoring.
*/
static void remove_monitor_info(struct sk_buff *skb,
unsigned int present_fcs_len,
unsigned int rtap_vendor_space)
{
if (present_fcs_len)
__pskb_trim(skb, skb->len - present_fcs_len);
__pskb_pull(skb, rtap_vendor_space);
}
static inline bool should_drop_frame(struct sk_buff *skb, int present_fcs_len,
unsigned int rtap_vendor_space)
{
struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
struct ieee80211_hdr *hdr;
hdr = (void *)(skb->data + rtap_vendor_space);
if (status->flag & (RX_FLAG_FAILED_FCS_CRC |
RX_FLAG_FAILED_PLCP_CRC |
RX_FLAG_ONLY_MONITOR))
return true;
if (unlikely(skb->len < 16 + present_fcs_len + rtap_vendor_space))
return true;
if (ieee80211_is_ctl(hdr->frame_control) &&
!ieee80211_is_pspoll(hdr->frame_control) &&
!ieee80211_is_back_req(hdr->frame_control))
return true;
return false;
}
static int
ieee80211_rx_radiotap_hdrlen(struct ieee80211_local *local,
struct ieee80211_rx_status *status,
struct sk_buff *skb)
{
int len;
/* always present fields */
len = sizeof(struct ieee80211_radiotap_header) + 8;
/* allocate extra bitmaps */
if (status->chains)
len += 4 * hweight8(status->chains);
if (ieee80211_have_rx_timestamp(status)) {
len = ALIGN(len, 8);
len += 8;
}
if (ieee80211_hw_check(&local->hw, SIGNAL_DBM))
len += 1;
/* antenna field, if we don't have per-chain info */
if (!status->chains)
len += 1;
/* padding for RX_FLAGS if necessary */
len = ALIGN(len, 2);
if (status->encoding == RX_ENC_HT) /* HT info */
len += 3;
if (status->flag & RX_FLAG_AMPDU_DETAILS) {
len = ALIGN(len, 4);
len += 8;
}
if (status->encoding == RX_ENC_VHT) {
len = ALIGN(len, 2);
len += 12;
}
if (local->hw.radiotap_timestamp.units_pos >= 0) {
len = ALIGN(len, 8);
len += 12;
}
if (status->chains) {
/* antenna and antenna signal fields */
len += 2 * hweight8(status->chains);
}
if (status->flag & RX_FLAG_RADIOTAP_VENDOR_DATA) {
struct ieee80211_vendor_radiotap *rtap = (void *)skb->data;
/* vendor presence bitmap */
len += 4;
/* alignment for fixed 6-byte vendor data header */
len = ALIGN(len, 2);
/* vendor data header */
len += 6;
if (WARN_ON(rtap->align == 0))
rtap->align = 1;
len = ALIGN(len, rtap->align);
len += rtap->len + rtap->pad;
}
return len;
}
static void ieee80211_handle_mu_mimo_mon(struct ieee80211_sub_if_data *sdata,
struct sk_buff *skb,
int rtap_vendor_space)
{
struct {
struct ieee80211_hdr_3addr hdr;
u8 category;
u8 action_code;
} __packed action;
if (!sdata)
return;
BUILD_BUG_ON(sizeof(action) != IEEE80211_MIN_ACTION_SIZE + 1);
if (skb->len < rtap_vendor_space + sizeof(action) +
VHT_MUMIMO_GROUPS_DATA_LEN)
return;
if (!is_valid_ether_addr(sdata->u.mntr.mu_follow_addr))
return;
skb_copy_bits(skb, rtap_vendor_space, &action, sizeof(action));
if (!ieee80211_is_action(action.hdr.frame_control))
return;
if (action.category != WLAN_CATEGORY_VHT)
return;
if (action.action_code != WLAN_VHT_ACTION_GROUPID_MGMT)
return;
if (!ether_addr_equal(action.hdr.addr1, sdata->u.mntr.mu_follow_addr))
return;
skb = skb_copy(skb, GFP_ATOMIC);
if (!skb)
return;
skb_queue_tail(&sdata->skb_queue, skb);
ieee80211_queue_work(&sdata->local->hw, &sdata->work);
}
/*
* 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, bool has_fcs)
{
struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
struct ieee80211_radiotap_header *rthdr;
unsigned char *pos;
__le32 *it_present;
u32 it_present_val;
u16 rx_flags = 0;
u16 channel_flags = 0;
int mpdulen, chain;
unsigned long chains = status->chains;
struct ieee80211_vendor_radiotap rtap = {};
if (status->flag & RX_FLAG_RADIOTAP_VENDOR_DATA) {
rtap = *(struct ieee80211_vendor_radiotap *)skb->data;
/* rtap.len and rtap.pad are undone immediately */
skb_pull(skb, sizeof(rtap) + rtap.len + rtap.pad);
}
mpdulen = skb->len;
if (!(has_fcs && ieee80211_hw_check(&local->hw, RX_INCLUDES_FCS)))
mpdulen += FCS_LEN;
rthdr = skb_push(skb, rtap_len);
memset(rthdr, 0, rtap_len - rtap.len - rtap.pad);
it_present = &rthdr->it_present;
/* radiotap header, set always present flags */
rthdr->it_len = cpu_to_le16(rtap_len);
it_present_val = BIT(IEEE80211_RADIOTAP_FLAGS) |
BIT(IEEE80211_RADIOTAP_CHANNEL) |
BIT(IEEE80211_RADIOTAP_RX_FLAGS);
if (!status->chains)
it_present_val |= BIT(IEEE80211_RADIOTAP_ANTENNA);
for_each_set_bit(chain, &chains, IEEE80211_MAX_CHAINS) {
it_present_val |=
BIT(IEEE80211_RADIOTAP_EXT) |
BIT(IEEE80211_RADIOTAP_RADIOTAP_NAMESPACE);
put_unaligned_le32(it_present_val, it_present);
it_present++;
it_present_val = BIT(IEEE80211_RADIOTAP_ANTENNA) |
BIT(IEEE80211_RADIOTAP_DBM_ANTSIGNAL);
}
if (status->flag & RX_FLAG_RADIOTAP_VENDOR_DATA) {
it_present_val |= BIT(IEEE80211_RADIOTAP_VENDOR_NAMESPACE) |
BIT(IEEE80211_RADIOTAP_EXT);
put_unaligned_le32(it_present_val, it_present);
it_present++;
it_present_val = rtap.present;
}
put_unaligned_le32(it_present_val, it_present);
pos = (void *)(it_present + 1);
/* the order of the following fields is important */
/* IEEE80211_RADIOTAP_TSFT */
if (ieee80211_have_rx_timestamp(status)) {
/* padding */
while ((pos - (u8 *)rthdr) & 7)
*pos++ = 0;
put_unaligned_le64(
ieee80211_calculate_rx_timestamp(local, status,
mpdulen, 0),
pos);
rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_TSFT);
pos += 8;
}
/* IEEE80211_RADIOTAP_FLAGS */
if (has_fcs && ieee80211_hw_check(&local->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->enc_flags & RX_ENC_FLAG_SHORTPRE)
*pos |= IEEE80211_RADIOTAP_F_SHORTPRE;
pos++;
/* IEEE80211_RADIOTAP_RATE */
if (!rate || status->encoding != RX_ENC_LEGACY) {
/*
* 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 {
int shift = 0;
rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_RATE);
if (status->bw == RATE_INFO_BW_10)
shift = 1;
else if (status->bw == RATE_INFO_BW_5)
shift = 2;
*pos = DIV_ROUND_UP(rate->bitrate, 5 * (1 << shift));
}
pos++;
/* IEEE80211_RADIOTAP_CHANNEL */
put_unaligned_le16(status->freq, pos);
pos += 2;
if (status->bw == RATE_INFO_BW_10)
channel_flags |= IEEE80211_CHAN_HALF;
else if (status->bw == RATE_INFO_BW_5)
channel_flags |= IEEE80211_CHAN_QUARTER;
if (status->band == NL80211_BAND_5GHZ)
channel_flags |= IEEE80211_CHAN_OFDM | IEEE80211_CHAN_5GHZ;
else if (status->encoding != RX_ENC_LEGACY)
channel_flags |= IEEE80211_CHAN_DYN | IEEE80211_CHAN_2GHZ;
else if (rate && rate->flags & IEEE80211_RATE_ERP_G)
channel_flags |= IEEE80211_CHAN_OFDM | IEEE80211_CHAN_2GHZ;
else if (rate)
channel_flags |= IEEE80211_CHAN_CCK | IEEE80211_CHAN_2GHZ;
else
channel_flags |= IEEE80211_CHAN_2GHZ;
put_unaligned_le16(channel_flags, pos);
pos += 2;
/* IEEE80211_RADIOTAP_DBM_ANTSIGNAL */
if (ieee80211_hw_check(&local->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 */
if (!status->chains) {
/* 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++ = 0;
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->encoding == RX_ENC_HT) {
unsigned int stbc;
rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_MCS);
*pos++ = local->hw.radiotap_mcs_details;
*pos = 0;
if (status->enc_flags & RX_ENC_FLAG_SHORT_GI)
*pos |= IEEE80211_RADIOTAP_MCS_SGI;
if (status->bw == RATE_INFO_BW_40)
*pos |= IEEE80211_RADIOTAP_MCS_BW_40;
if (status->enc_flags & RX_ENC_FLAG_HT_GF)
*pos |= IEEE80211_RADIOTAP_MCS_FMT_GF;
if (status->enc_flags & RX_ENC_FLAG_LDPC)
*pos |= IEEE80211_RADIOTAP_MCS_FEC_LDPC;
stbc = (status->enc_flags & RX_ENC_FLAG_STBC_MASK) >> RX_ENC_FLAG_STBC_SHIFT;
*pos |= stbc << IEEE80211_RADIOTAP_MCS_STBC_SHIFT;
pos++;
*pos++ = status->rate_idx;
}
if (status->flag & RX_FLAG_AMPDU_DETAILS) {
u16 flags = 0;
/* ensure 4 byte alignment */
while ((pos - (u8 *)rthdr) & 3)
pos++;
rthdr->it_present |=
cpu_to_le32(1 << IEEE80211_RADIOTAP_AMPDU_STATUS);
put_unaligned_le32(status->ampdu_reference, pos);
pos += 4;
if (status->flag & RX_FLAG_AMPDU_LAST_KNOWN)
flags |= IEEE80211_RADIOTAP_AMPDU_LAST_KNOWN;
if (status->flag & RX_FLAG_AMPDU_IS_LAST)
flags |= IEEE80211_RADIOTAP_AMPDU_IS_LAST;
if (status->flag & RX_FLAG_AMPDU_DELIM_CRC_ERROR)
flags |= IEEE80211_RADIOTAP_AMPDU_DELIM_CRC_ERR;
if (status->flag & RX_FLAG_AMPDU_DELIM_CRC_KNOWN)
flags |= IEEE80211_RADIOTAP_AMPDU_DELIM_CRC_KNOWN;
if (status->flag & RX_FLAG_AMPDU_EOF_BIT_KNOWN)
flags |= IEEE80211_RADIOTAP_AMPDU_EOF_KNOWN;
if (status->flag & RX_FLAG_AMPDU_EOF_BIT)
flags |= IEEE80211_RADIOTAP_AMPDU_EOF;
put_unaligned_le16(flags, pos);
pos += 2;
if (status->flag & RX_FLAG_AMPDU_DELIM_CRC_KNOWN)
*pos++ = status->ampdu_delimiter_crc;
else
*pos++ = 0;
*pos++ = 0;
}
if (status->encoding == RX_ENC_VHT) {
u16 known = local->hw.radiotap_vht_details;
rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_VHT);
put_unaligned_le16(known, pos);
pos += 2;
/* flags */
if (status->enc_flags & RX_ENC_FLAG_SHORT_GI)
*pos |= IEEE80211_RADIOTAP_VHT_FLAG_SGI;
/* in VHT, STBC is binary */
if (status->enc_flags & RX_ENC_FLAG_STBC_MASK)
*pos |= IEEE80211_RADIOTAP_VHT_FLAG_STBC;
if (status->enc_flags & RX_ENC_FLAG_BF)
*pos |= IEEE80211_RADIOTAP_VHT_FLAG_BEAMFORMED;
pos++;
/* bandwidth */
switch (status->bw) {
case RATE_INFO_BW_80:
*pos++ = 4;
break;
case RATE_INFO_BW_160:
*pos++ = 11;
break;
case RATE_INFO_BW_40:
*pos++ = 1;
break;
default:
*pos++ = 0;
}
/* MCS/NSS */
*pos = (status->rate_idx << 4) | status->nss;
pos += 4;
/* coding field */
if (status->enc_flags & RX_ENC_FLAG_LDPC)
*pos |= IEEE80211_RADIOTAP_CODING_LDPC_USER0;
pos++;
/* group ID */
pos++;
/* partial_aid */
pos += 2;
}
if (local->hw.radiotap_timestamp.units_pos >= 0) {
u16 accuracy = 0;
u8 flags = IEEE80211_RADIOTAP_TIMESTAMP_FLAG_32BIT;
rthdr->it_present |=
cpu_to_le32(1 << IEEE80211_RADIOTAP_TIMESTAMP);
/* ensure 8 byte alignment */
while ((pos - (u8 *)rthdr) & 7)
pos++;
put_unaligned_le64(status->device_timestamp, pos);
pos += sizeof(u64);
if (local->hw.radiotap_timestamp.accuracy >= 0) {
accuracy = local->hw.radiotap_timestamp.accuracy;
flags |= IEEE80211_RADIOTAP_TIMESTAMP_FLAG_ACCURACY;
}
put_unaligned_le16(accuracy, pos);
pos += sizeof(u16);
*pos++ = local->hw.radiotap_timestamp.units_pos;
*pos++ = flags;
}
for_each_set_bit(chain, &chains, IEEE80211_MAX_CHAINS) {
*pos++ = status->chain_signal[chain];
*pos++ = chain;
}
if (status->flag & RX_FLAG_RADIOTAP_VENDOR_DATA) {
/* ensure 2 byte alignment for the vendor field as required */
if ((pos - (u8 *)rthdr) & 1)
*pos++ = 0;
*pos++ = rtap.oui[0];
*pos++ = rtap.oui[1];
*pos++ = rtap.oui[2];
*pos++ = rtap.subns;
put_unaligned_le16(rtap.len, pos);
pos += 2;
/* align the actual payload as requested */
while ((pos - (u8 *)rthdr) & (rtap.align - 1))
*pos++ = 0;
/* data (and possible padding) already follows */
}
}
static struct sk_buff *
ieee80211_make_monitor_skb(struct ieee80211_local *local,
struct sk_buff **origskb,
struct ieee80211_rate *rate,
int rtap_vendor_space, bool use_origskb)
{
struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(*origskb);
int rt_hdrlen, needed_headroom;
struct sk_buff *skb;
/* room for the radiotap header based on driver features */
rt_hdrlen = ieee80211_rx_radiotap_hdrlen(local, status, *origskb);
needed_headroom = rt_hdrlen - rtap_vendor_space;
if (use_origskb) {
/* 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);
if (!skb)
return NULL;
}
/* prepend radiotap information */
ieee80211_add_rx_radiotap_header(local, skb, rate, rt_hdrlen, true);
skb_reset_mac_header(skb);
skb->ip_summed = CHECKSUM_UNNECESSARY;
skb->pkt_type = PACKET_OTHERHOST;
skb->protocol = htons(ETH_P_802_2);
return skb;
}
/*
* 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;
struct sk_buff *monskb = NULL;
int present_fcs_len = 0;
unsigned int rtap_vendor_space = 0;
struct ieee80211_sub_if_data *monitor_sdata =
rcu_dereference(local->monitor_sdata);
bool only_monitor = false;
if (unlikely(status->flag & RX_FLAG_RADIOTAP_VENDOR_DATA)) {
struct ieee80211_vendor_radiotap *rtap = (void *)origskb->data;
rtap_vendor_space = sizeof(*rtap) + rtap->len + rtap->pad;
}
/*
* 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.
*/
if (ieee80211_hw_check(&local->hw, RX_INCLUDES_FCS)) {
if (unlikely(origskb->len <= FCS_LEN)) {
/* driver bug */
WARN_ON(1);
dev_kfree_skb(origskb);
return NULL;
}
present_fcs_len = FCS_LEN;
}
/* ensure hdr->frame_control and vendor radiotap data are in skb head */
if (!pskb_may_pull(origskb, 2 + rtap_vendor_space)) {
dev_kfree_skb(origskb);
return NULL;
}
only_monitor = should_drop_frame(origskb, present_fcs_len,
rtap_vendor_space);
if (!local->monitors || (status->flag & RX_FLAG_SKIP_MONITOR)) {
if (only_monitor) {
dev_kfree_skb(origskb);
return NULL;
}
remove_monitor_info(origskb, present_fcs_len,
rtap_vendor_space);
return origskb;
}
ieee80211_handle_mu_mimo_mon(monitor_sdata, origskb, rtap_vendor_space);
list_for_each_entry_rcu(sdata, &local->mon_list, u.mntr.list) {
bool last_monitor = list_is_last(&sdata->u.mntr.list,
&local->mon_list);
if (!monskb)
monskb = ieee80211_make_monitor_skb(local, &origskb,
rate,
rtap_vendor_space,
only_monitor &&
last_monitor);
if (monskb) {
struct sk_buff *skb;
if (last_monitor) {
skb = monskb;
monskb = NULL;
} else {
skb = skb_clone(monskb, GFP_ATOMIC);
}
if (skb) {
skb->dev = sdata->dev;
ieee80211_rx_stats(skb->dev, skb->len);
netif_receive_skb(skb);
}
}
if (last_monitor)
break;
}
/* this happens if last_monitor was erroneously false */
dev_kfree_skb(monskb);
/* ditto */
if (!origskb)
return NULL;
remove_monitor_info(origskb, present_fcs_len, rtap_vendor_space);
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 = IEEE80211_NUM_TIDS;
security_idx = 0;
if (ieee80211_is_mgmt(hdr->frame_control))
security_idx = IEEE80211_NUM_TIDS;
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_ON_ONCE((unsigned long)rx->skb->data & 1);
#endif
}
/* rx handlers */
static int ieee80211_is_unicast_robust_mgmt_frame(struct sk_buff *skb)
{
struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
if (is_multicast_ether_addr(hdr->addr1))
return 0;
return ieee80211_is_robust_mgmt_frame(skb);
}
static int ieee80211_is_multicast_robust_mgmt_frame(struct sk_buff *skb)
{
struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
if (!is_multicast_ether_addr(hdr->addr1))
return 0;
return ieee80211_is_robust_mgmt_frame(skb);
}
/* 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;
struct ieee80211_mmie_16 *mmie16;
if (skb->len < 24 + sizeof(*mmie) || !is_multicast_ether_addr(hdr->da))
return -1;
if (!ieee80211_is_robust_mgmt_frame(skb))
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 le16_to_cpu(mmie->key_id);
mmie16 = (struct ieee80211_mmie_16 *)
(skb->data + skb->len - sizeof(*mmie16));
if (skb->len >= 24 + sizeof(*mmie16) &&
mmie16->element_id == WLAN_EID_MMIE &&
mmie16->length == sizeof(*mmie16) - 2)
return le16_to_cpu(mmie16->key_id);
return -1;
}
static int ieee80211_get_cs_keyid(const struct ieee80211_cipher_scheme *cs,
struct sk_buff *skb)
{
struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
__le16 fc;
int hdrlen;
u8 keyid;
fc = hdr->frame_control;
hdrlen = ieee80211_hdrlen(fc);
if (skb->len < hdrlen + cs->hdr_len)
return -EINVAL;
skb_copy_bits(skb, hdrlen + cs->key_idx_off, &keyid, 1);
keyid &= cs->key_idx_mask;
keyid >>= cs->key_idx_shift;
return keyid;
}
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 (ether_addr_equal(hdr->addr3, dev_addr))
return RX_DROP_MONITOR;
} else {
if (!ieee80211_has_a4(hdr->frame_control))
return RX_DROP_MONITOR;
if (ether_addr_equal(hdr->addr4, dev_addr))
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;
/* make sure category field is present */
if (rx->skb->len < IEEE80211_MIN_ACTION_SIZE)
return RX_DROP_MONITOR;
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;
}
static inline bool ieee80211_rx_reorder_ready(struct tid_ampdu_rx *tid_agg_rx,
int index)
{
struct sk_buff_head *frames = &tid_agg_rx->reorder_buf[index];
struct sk_buff *tail = skb_peek_tail(frames);
struct ieee80211_rx_status *status;
if (tid_agg_rx->reorder_buf_filtered & BIT_ULL(index))
return true;
if (!tail)
return false;
status = IEEE80211_SKB_RXCB(tail);
if (status->flag & RX_FLAG_AMSDU_MORE)
return false;
return true;
}
static void ieee80211_release_reorder_frame(struct ieee80211_sub_if_data *sdata,
struct tid_ampdu_rx *tid_agg_rx,
int index,
struct sk_buff_head *frames)
{
struct sk_buff_head *skb_list = &tid_agg_rx->reorder_buf[index];
struct sk_buff *skb;
struct ieee80211_rx_status *status;
lockdep_assert_held(&tid_agg_rx->reorder_lock);
if (skb_queue_empty(skb_list))
goto no_frame;
if (!ieee80211_rx_reorder_ready(tid_agg_rx, index)) {
__skb_queue_purge(skb_list);
goto no_frame;
}
/* release frames from the reorder ring buffer */
tid_agg_rx->stored_mpdu_num--;
while ((skb = __skb_dequeue(skb_list))) {
status = IEEE80211_SKB_RXCB(skb);
status->rx_flags |= IEEE80211_RX_DEFERRED_RELEASE;
__skb_queue_tail(frames, skb);
}
no_frame:
tid_agg_rx->reorder_buf_filtered &= ~BIT_ULL(index);
tid_agg_rx->head_seq_num = ieee80211_sn_inc(tid_agg_rx->head_seq_num);
}
static void ieee80211_release_reorder_frames(struct ieee80211_sub_if_data *sdata,
struct tid_ampdu_rx *tid_agg_rx,
u16 head_seq_num,
struct sk_buff_head *frames)
{
int index;
lockdep_assert_held(&tid_agg_rx->reorder_lock);
while (ieee80211_sn_less(tid_agg_rx->head_seq_num, head_seq_num)) {
index = tid_agg_rx->head_seq_num % tid_agg_rx->buf_size;
ieee80211_release_reorder_frame(sdata, tid_agg_rx, index,
frames);
}
}
/*
* 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_sub_if_data *sdata,
struct tid_ampdu_rx *tid_agg_rx,
struct sk_buff_head *frames)
{
int index, i, j;
lockdep_assert_held(&tid_agg_rx->reorder_lock);
/* release the buffer until next missing frame */
index = tid_agg_rx->head_seq_num % tid_agg_rx->buf_size;
if (!ieee80211_rx_reorder_ready(tid_agg_rx, 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 (!ieee80211_rx_reorder_ready(tid_agg_rx, j)) {
skipped++;
continue;
}
if (skipped &&
!time_after(jiffies, tid_agg_rx->reorder_time[j] +
HT_RX_REORDER_BUF_TIMEOUT))
goto set_release_timer;
/* don't leave incomplete A-MSDUs around */
for (i = (index + 1) % tid_agg_rx->buf_size; i != j;
i = (i + 1) % tid_agg_rx->buf_size)
__skb_queue_purge(&tid_agg_rx->reorder_buf[i]);
ht_dbg_ratelimited(sdata,
"release an RX reorder frame due to timeout on earlier frames\n");
ieee80211_release_reorder_frame(sdata, tid_agg_rx, j,
frames);
/*
* Increment the head seq# also for the skipped slots.
*/
tid_agg_rx->head_seq_num =
(tid_agg_rx->head_seq_num +
skipped) & IEEE80211_SN_MASK;
skipped = 0;
}
} else while (ieee80211_rx_reorder_ready(tid_agg_rx, index)) {
ieee80211_release_reorder_frame(sdata, tid_agg_rx, index,
frames);
index = tid_agg_rx->head_seq_num % tid_agg_rx->buf_size;
}
if (tid_agg_rx->stored_mpdu_num) {
j = index = tid_agg_rx->head_seq_num % tid_agg_rx->buf_size;
for (; j != (index - 1) % tid_agg_rx->buf_size;
j = (j + 1) % tid_agg_rx->buf_size) {
if (ieee80211_rx_reorder_ready(tid_agg_rx, j))
break;
}
set_release_timer:
if (!tid_agg_rx->removed)
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_sub_if_data *sdata,
struct tid_ampdu_rx *tid_agg_rx,
struct sk_buff *skb,
struct sk_buff_head *frames)
{
struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
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);
/*
* Offloaded BA sessions have no known starting sequence number so pick
* one from first Rxed frame for this tid after BA was started.
*/
if (unlikely(tid_agg_rx->auto_seq)) {
tid_agg_rx->auto_seq = false;
tid_agg_rx->ssn = mpdu_seq_num;
tid_agg_rx->head_seq_num = mpdu_seq_num;
}
buf_size = tid_agg_rx->buf_size;
head_seq_num = tid_agg_rx->head_seq_num;
/*
* If the current MPDU's SN is smaller than the SSN, it shouldn't
* be reordered.
*/
if (unlikely(!tid_agg_rx->started)) {
if (ieee80211_sn_less(mpdu_seq_num, head_seq_num)) {
ret = false;
goto out;
}
tid_agg_rx->started = true;
}
/* frame with out of date sequence number */
if (ieee80211_sn_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 (!ieee80211_sn_less(mpdu_seq_num, head_seq_num + buf_size)) {
head_seq_num = ieee80211_sn_inc(
ieee80211_sn_sub(mpdu_seq_num, buf_size));
/* release stored frames up to new head to stack */
ieee80211_release_reorder_frames(sdata, tid_agg_rx,
head_seq_num, frames);
}
/* Now the new frame is always in the range of the reordering buffer */
index = mpdu_seq_num % tid_agg_rx->buf_size;
/* check if we already stored this frame */
if (ieee80211_rx_reorder_ready(tid_agg_rx, 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) {
if (!(status->flag & RX_FLAG_AMSDU_MORE))
tid_agg_rx->head_seq_num =
ieee80211_sn_inc(tid_agg_rx->head_seq_num);
ret = false;
goto out;
}
/* put the frame in the reordering buffer */
__skb_queue_tail(&tid_agg_rx->reorder_buf[index], skb);
if (!(status->flag & RX_FLAG_AMSDU_MORE)) {
tid_agg_rx->reorder_time[index] = jiffies;
tid_agg_rx->stored_mpdu_num++;
ieee80211_sta_reorder_release(sdata, tid_agg_rx, frames);
}
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_head *frames)
{
struct sk_buff *skb = rx->skb;
struct ieee80211_local *local = rx->local;
struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
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) ||
is_multicast_ether_addr(hdr->addr1))
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_tid(hdr);
tid_agg_rx = rcu_dereference(sta->ampdu_mlme.tid_rx[tid]);
if (!tid_agg_rx) {
if (ack_policy == IEEE80211_QOS_CTL_ACK_POLICY_BLOCKACK &&
!test_bit(tid, rx->sta->ampdu_mlme.agg_session_valid) &&
!test_and_set_bit(tid, rx->sta->ampdu_mlme.unexpected_agg))
ieee80211_send_delba(rx->sdata, rx->sta->sta.addr, tid,
WLAN_BACK_RECIPIENT,
WLAN_REASON_QSTA_REQUIRE_SETUP);
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;
/* new, potentially un-ordered, ampdu frame - process it */
/* reset session timer */
if (tid_agg_rx->timeout)
tid_agg_rx->last_rx = jiffies;
/* if this mpdu is fragmented - terminate rx aggregation session */
sc = le16_to_cpu(hdr->seq_ctrl);
if (sc & IEEE80211_SCTL_FRAG) {
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(rx->sdata, tid_agg_rx, skb,
frames))
return;
dont_reorder:
__skb_queue_tail(frames, skb);
}
static ieee80211_rx_result debug_noinline
ieee80211_rx_h_check_dup(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);
if (status->flag & RX_FLAG_DUP_VALIDATED)
return RX_CONTINUE;
/*
* Drop duplicate 802.11 retransmissions
* (IEEE 802.11-2012: 9.3.2.10 "Duplicate detection and recovery")
*/
if (rx->skb->len < 24)
return RX_CONTINUE;
if (ieee80211_is_ctl(hdr->frame_control) ||
ieee80211_is_qos_nullfunc(hdr->frame_control) ||
is_multicast_ether_addr(hdr->addr1))
return RX_CONTINUE;
if (!rx->sta)
return RX_CONTINUE;
if (unlikely(ieee80211_has_retry(hdr->frame_control) &&
rx->sta->last_seq_ctrl[rx->seqno_idx] == hdr->seq_ctrl)) {
I802_DEBUG_INC(rx->local->dot11FrameDuplicateCount);
rx->sta->rx_stats.num_duplicates++;
return RX_DROP_UNUSABLE;
} else if (!(status->flag & RX_FLAG_AMSDU_MORE)) {
rx->sta->last_seq_ctrl[rx->seqno_idx] = hdr->seq_ctrl;
}
return RX_CONTINUE;
}
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;
/* 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->sdata->vif.type != NL80211_IFTYPE_OCB &&
(!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)) {
unsigned int hdrlen;
__be16 ethertype;
hdrlen = ieee80211_hdrlen(hdr->frame_control);
if (rx->skb->len < hdrlen + 8)
return RX_DROP_MONITOR;
skb_copy_bits(rx->skb, hdrlen + 6, &ethertype, 2);
if (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_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 sta_ps_start(struct sta_info *sta)
{
struct ieee80211_sub_if_data *sdata = sta->sdata;
struct ieee80211_local *local = sdata->local;
struct ps_data *ps;
int tid;
if (sta->sdata->vif.type == NL80211_IFTYPE_AP ||
sta->sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
ps = &sdata->bss->ps;
else
return;
atomic_inc(&ps->num_sta_ps);
set_sta_flag(sta, WLAN_STA_PS_STA);
if (!ieee80211_hw_check(&local->hw, AP_LINK_PS))
drv_sta_notify(local, sdata, STA_NOTIFY_SLEEP, &sta->sta);
ps_dbg(sdata, "STA %pM aid %d enters power save mode\n",
sta->sta.addr, sta->sta.aid);
ieee80211_clear_fast_xmit(sta);
if (!sta->sta.txq[0])
return;
for (tid = 0; tid < ARRAY_SIZE(sta->sta.txq); tid++) {
if (txq_has_queue(sta->sta.txq[tid]))
set_bit(tid, &sta->txq_buffered_tids);
else
clear_bit(tid, &sta->txq_buffered_tids);
}
}
static void sta_ps_end(struct sta_info *sta)
{
ps_dbg(sta->sdata, "STA %pM aid %d exits power save mode\n",
sta->sta.addr, sta->sta.aid);
if (test_sta_flag(sta, WLAN_STA_PS_DRIVER)) {
/*
* Clear the flag only if the other one is still set
* so that the TX path won't start TX'ing new frames
* directly ... In the case that the driver flag isn't
* set ieee80211_sta_ps_deliver_wakeup() will clear it.
*/
clear_sta_flag(sta, WLAN_STA_PS_STA);
ps_dbg(sta->sdata, "STA %pM aid %d driver-ps-blocked\n",
sta->sta.addr, sta->sta.aid);
return;
}
set_sta_flag(sta, WLAN_STA_PS_DELIVER);
clear_sta_flag(sta, WLAN_STA_PS_STA);
ieee80211_sta_ps_deliver_wakeup(sta);
}
int ieee80211_sta_ps_transition(struct ieee80211_sta *pubsta, bool start)
{
struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
bool in_ps;
WARN_ON(!ieee80211_hw_check(&sta->local->hw, AP_LINK_PS));
/* Don't let the same PS state be set twice */
in_ps = test_sta_flag(sta, WLAN_STA_PS_STA);
if ((start && in_ps) || (!start && !in_ps))
return -EINVAL;
if (start)
sta_ps_start(sta);
else
sta_ps_end(sta);
return 0;
}
EXPORT_SYMBOL(ieee80211_sta_ps_transition);
void ieee80211_sta_pspoll(struct ieee80211_sta *pubsta)
{
struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
if (test_sta_flag(sta, WLAN_STA_SP))
return;
if (!test_sta_flag(sta, WLAN_STA_PS_DRIVER))
ieee80211_sta_ps_deliver_poll_response(sta);
else
set_sta_flag(sta, WLAN_STA_PSPOLL);
}
EXPORT_SYMBOL(ieee80211_sta_pspoll);
void ieee80211_sta_uapsd_trigger(struct ieee80211_sta *pubsta, u8 tid)
{
struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
int ac = ieee80211_ac_from_tid(tid);
/*
* If this AC is not trigger-enabled do nothing unless the
* driver is calling us after it already checked.
*
* 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 (!(sta->sta.uapsd_queues & ieee80211_ac_to_qos_mask[ac]) &&
tid != IEEE80211_NUM_TIDS)
return;
/* if we are in a service period, do nothing */
if (test_sta_flag(sta, WLAN_STA_SP))
return;
if (!test_sta_flag(sta, WLAN_STA_PS_DRIVER))
ieee80211_sta_ps_deliver_uapsd(sta);
else
set_sta_flag(sta, WLAN_STA_UAPSD);
}
EXPORT_SYMBOL(ieee80211_sta_uapsd_trigger);
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);
if (!rx->sta)
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 (ieee80211_hw_check(&sdata->local->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))) {
ieee80211_sta_pspoll(&rx->sta->sta);
/* 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))) {
u8 tid = ieee80211_get_tid(hdr);
ieee80211_sta_uapsd_trigger(&rx->sta->sta, tid);
}
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;
int i;
if (!sta)
return RX_CONTINUE;
/*
* Update last_rx only for IBSS packets which are for the current
* BSSID and for station already AUTHORIZED to avoid keeping the
* current IBSS network alive in cases where other STAs start
* using different BSSID. This will also give the station another
* chance to restart the authentication/authorization in case
* something went wrong the first time.
*/
if (rx->sdata->vif.type == NL80211_IFTYPE_ADHOC) {
u8 *bssid = ieee80211_get_bssid(hdr, rx->skb->len,
NL80211_IFTYPE_ADHOC);
if (ether_addr_equal(bssid, rx->sdata->u.ibss.bssid) &&
test_sta_flag(sta, WLAN_STA_AUTHORIZED)) {
sta->rx_stats.last_rx = jiffies;
if (ieee80211_is_data(hdr->frame_control) &&
!is_multicast_ether_addr(hdr->addr1))
sta->rx_stats.last_rate =
sta_stats_encode_rate(status);
}
} else if (rx->sdata->vif.type == NL80211_IFTYPE_OCB) {
sta->rx_stats.last_rx = jiffies;
} 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->rx_stats.last_rx = jiffies;
if (ieee80211_is_data(hdr->frame_control))
sta->rx_stats.last_rate = sta_stats_encode_rate(status);
}
if (rx->sdata->vif.type == NL80211_IFTYPE_STATION)
ieee80211_sta_rx_notify(rx->sdata, hdr);
sta->rx_stats.fragments++;
u64_stats_update_begin(&rx->sta->rx_stats.syncp);
sta->rx_stats.bytes += rx->skb->len;
u64_stats_update_end(&rx->sta->rx_stats.syncp);
if (!(status->flag & RX_FLAG_NO_SIGNAL_VAL)) {
sta->rx_stats.last_signal = status->signal;
ewma_signal_add(&sta->rx_stats_avg.signal, -status->signal);
}
if (status->chains) {
sta->rx_stats.chains = status->chains;
for (i = 0; i < ARRAY_SIZE(status->chain_signal); i++) {
int signal = status->chain_signal[i];
if (!(status->chains & BIT(i)))
continue;
sta->rx_stats.chain_signal_last[i] = signal;
ewma_signal_add(&sta->rx_stats_avg.chain_signal[i],
-signal);
}
}
/*
* Change STA power saving mode only at the end of a frame
* exchange sequence, and only for a data or management
* frame as specified in IEEE 802.11-2016 11.2.3.2
*/
if (!ieee80211_hw_check(&sta->local->hw, AP_LINK_PS) &&
!ieee80211_has_morefrags(hdr->frame_control) &&
(ieee80211_is_mgmt(hdr->frame_control) ||
ieee80211_is_data(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)) {
if (!ieee80211_has_pm(hdr->frame_control))
sta_ps_end(sta);
} else {
if (ieee80211_has_pm(hdr->frame_control))
sta_ps_start(sta);
}
}
/* mesh power save support */
if (ieee80211_vif_is_mesh(&rx->sdata->vif))
ieee80211_mps_rx_h_sta_process(sta, hdr);
/*
* 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_stats.packets++;
dev_kfree_skb(rx->skb);
return RX_QUEUED;
}
return RX_CONTINUE;
} /* ieee80211_rx_h_sta_process */
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;
const struct ieee80211_cipher_scheme *cs = NULL;
/*
* 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.
*/
/* start without a key */
rx->key = NULL;
fc = hdr->frame_control;
if (rx->sta) {
int keyid = rx->sta->ptk_idx;
if (ieee80211_has_protected(fc) && rx->sta->cipher_scheme) {
cs = rx->sta->cipher_scheme;
keyid = ieee80211_get_cs_keyid(cs, rx->skb);
if (unlikely(keyid < 0))
return RX_DROP_UNUSABLE;
}
sta_ptk = rcu_dereference(rx->sta->ptk[keyid]);
}
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) {
if (ieee80211_is_group_privacy_action(skb) &&
test_sta_flag(rx->sta, WLAN_STA_MFP))
return RX_DROP_MONITOR;
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 (cs) {
keyidx = ieee80211_get_cs_keyid(cs, rx->skb);
if (unlikely(keyidx < 0))
return RX_DROP_UNUSABLE;
} else {
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;
/* 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, IEEE80211_CCMP_MIC_LEN);
break;
case WLAN_CIPHER_SUITE_CCMP_256:
result = ieee80211_crypto_ccmp_decrypt(
rx, IEEE80211_CCMP_256_MIC_LEN);
break;
case WLAN_CIPHER_SUITE_AES_CMAC:
result = ieee80211_crypto_aes_cmac_decrypt(rx);
break;
case WLAN_CIPHER_SUITE_BIP_CMAC_256:
result = ieee80211_crypto_aes_cmac_256_decrypt(rx);
break;
case WLAN_CIPHER_SUITE_BIP_GMAC_128:
case WLAN_CIPHER_SUITE_BIP_GMAC_256:
result = ieee80211_crypto_aes_gmac_decrypt(rx);
break;
case WLAN_CIPHER_SUITE_GCMP:
case WLAN_CIPHER_SUITE_GCMP_256:
result = ieee80211_crypto_gcmp_decrypt(rx);
break;
default:
result = ieee80211_crypto_hw_decrypt(rx);
}
/* 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 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;
entry = &sdata->fragments[sdata->fragment_next++];
if (sdata->fragment_next >= IEEE80211_FRAGMENT_MAX)
sdata->fragment_next = 0;
if (!skb_queue_empty(&entry->skb_list))
__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->check_sequential_pn = false;
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)) ||
!ether_addr_equal(hdr->addr1, f_hdr->addr1) ||
!ether_addr_equal(hdr->addr2, f_hdr->addr2))
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;
hdr = (struct ieee80211_hdr *)rx->skb->data;
fc = hdr->frame_control;
if (ieee80211_is_ctl(fc))
return RX_CONTINUE;
sc = le16_to_cpu(hdr->seq_ctrl);
frag = sc & IEEE80211_SCTL_FRAG;
if (is_multicast_ether_addr(hdr->addr1)) {
I802_DEBUG_INC(rx->local->dot11MulticastReceivedFrameCount);
goto out_no_led;
}
if (likely(!ieee80211_has_morefrags(fc) && frag == 0))
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 ||
rx->key->conf.cipher == WLAN_CIPHER_SUITE_CCMP_256 ||
rx->key->conf.cipher == WLAN_CIPHER_SUITE_GCMP ||
rx->key->conf.cipher == WLAN_CIPHER_SUITE_GCMP_256) &&
ieee80211_has_protected(fc)) {
int queue = rx->security_idx;
/* Store CCMP/GCMP PN so that we can verify that the
* next fragment has a sequential PN value.
*/
entry->check_sequential_pn = true;
memcpy(entry->last_pn,
rx->key->u.ccmp.rx_pn[queue],
IEEE80211_CCMP_PN_LEN);
BUILD_BUG_ON(offsetof(struct ieee80211_key,
u.ccmp.rx_pn) !=
offsetof(struct ieee80211_key,
u.gcmp.rx_pn));
BUILD_BUG_ON(sizeof(rx->key->u.ccmp.rx_pn[queue]) !=
sizeof(rx->key->u.gcmp.rx_pn[queue]));
BUILD_BUG_ON(IEEE80211_CCMP_PN_LEN !=
IEEE80211_GCMP_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;
}
/* "The receiver shall discard MSDUs and MMPDUs whose constituent
* MPDU PN values are not incrementing in steps of 1."
* see IEEE P802.11-REVmc/D5.0, 12.5.3.4.4, item d (for CCMP)
* and IEEE P802.11-REVmc/D5.0, 12.5.5.4.4, item d (for GCMP)
*/
if (entry->check_sequential_pn) {
int i;
u8 pn[IEEE80211_CCMP_PN_LEN], *rpn;
int queue;
if (!rx->key ||
(rx->key->conf.cipher != WLAN_CIPHER_SUITE_CCMP &&
rx->key->conf.cipher != WLAN_CIPHER_SUITE_CCMP_256 &&
rx->key->conf.cipher != WLAN_CIPHER_SUITE_GCMP &&
rx->key->conf.cipher != WLAN_CIPHER_SUITE_GCMP_256))
return RX_DROP_UNUSABLE;
memcpy(pn, entry->last_pn, IEEE80211_CCMP_PN_LEN);
for (i = IEEE80211_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, IEEE80211_CCMP_PN_LEN))
return RX_DROP_UNUSABLE;
memcpy(entry->last_pn, pn, IEEE80211_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_head_defrag);
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))) {
skb_put_data(rx->skb, skb->data, skb->len);
dev_kfree_skb(skb);
}
out:
ieee80211_led_rx(rx->local);
out_no_led:
if (rx->sta)
rx->sta->rx_stats.packets++;
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))
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) ||
ieee80211_is_disassoc(fc))
cfg80211_rx_unprot_mlme_mgmt(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) ||
ieee80211_is_disassoc(fc))
cfg80211_rx_unprot_mlme_mgmt(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(rx->skb)))
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 &&
(ether_addr_equal(ehdr->h_dest, rx->sdata->vif.addr) ||
ether_addr_equal(ehdr->h_dest, pae_group_addr)))
return true;
if (ieee80211_802_1x_port_control(rx) ||
ieee80211_drop_unencrypted(rx, fc))
return false;
return true;
}
static void ieee80211_deliver_skb_to_local_stack(struct sk_buff *skb,
struct ieee80211_rx_data *rx)
{
struct ieee80211_sub_if_data *sdata = rx->sdata;
struct net_device *dev = sdata->dev;
if (unlikely((skb->protocol == sdata->control_port_protocol ||
skb->protocol == cpu_to_be16(ETH_P_PREAUTH)) &&
sdata->control_port_over_nl80211)) {
struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
bool noencrypt = status->flag & RX_FLAG_DECRYPTED;
struct ethhdr *ehdr = eth_hdr(skb);
cfg80211_rx_control_port(dev, skb->data, skb->len,
ehdr->h_source,
be16_to_cpu(skb->protocol), noencrypt);
dev_kfree_skb(skb);
} else {
/* deliver to local stack */
if (rx->napi)
napi_gro_receive(rx->napi, skb);
else
netif_receive_skb(skb);
}
}
/*
* 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;
skb = rx->skb;
xmit_skb = NULL;
ieee80211_rx_stats(dev, skb->len);
if (rx->sta) {
/* The seqno index has the same property as needed
* for the rx_msdu field, i.e. it is IEEE80211_NUM_TIDS
* for non-QoS-data frames. Here we know it's a data
* frame, so count MSDUs.
*/
u64_stats_update_begin(&rx->sta->rx_stats.syncp);
rx->sta->rx_stats.msdu[rx->seqno_idx]++;
u64_stats_update_end(&rx->sta->rx_stats.syncp);
}
if ((sdata->vif.type == NL80211_IFTYPE_AP ||
sdata->vif.type == NL80211_IFTYPE_AP_VLAN) &&
!(sdata->flags & IEEE80211_SDATA_DONT_BRIDGE_PACKETS) &&
(sdata->vif.type != NL80211_IFTYPE_AP_VLAN || !sdata->u.vlan.sta)) {
if (is_multicast_ether_addr(ehdr->h_dest) &&
ieee80211_vif_get_num_mcast_if(sdata) != 0) {
/*
* 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_info_ratelimited("%s: failed to clone multicast frame\n",
dev->name);
} else if (!is_multicast_ether_addr(ehdr->h_dest)) {
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;
}
}
}
#ifndef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS
if (skb) {
/* '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; the code here works just
* as well if that isn't true, but mac80211 assumes it can
* access fields as 2-byte aligned (e.g. for ether_addr_equal)
*/
int align;
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) {
skb->protocol = eth_type_trans(skb, dev);
memset(skb->cb, 0, sizeof(skb->cb));
ieee80211_deliver_skb_to_local_stack(skb, rx);
}
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, u8 data_offset)
{
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 ethhdr ethhdr;
const u8 *check_da = ethhdr.h_dest, *check_sa = ethhdr.h_source;
if (unlikely(ieee80211_has_a4(hdr->frame_control))) {
check_da = NULL;
check_sa = NULL;
} else switch (rx->sdata->vif.type) {
case NL80211_IFTYPE_AP:
case NL80211_IFTYPE_AP_VLAN:
check_da = NULL;
break;
case NL80211_IFTYPE_STATION:
if (!rx->sta ||
!test_sta_flag(rx->sta, WLAN_STA_TDLS_PEER))
check_sa = NULL;
break;
case NL80211_IFTYPE_MESH_POINT:
check_sa = NULL;
break;
default:
break;
}
skb->dev = dev;
__skb_queue_head_init(&frame_list);
if (ieee80211_data_to_8023_exthdr(skb, &ethhdr,
rx->sdata->vif.addr,
rx->sdata->vif.type,
data_offset))
return RX_DROP_UNUSABLE;
ieee80211_amsdu_to_8023s(skb, &frame_list, dev->dev_addr,
rx->sdata->vif.type,
rx->local->hw.extra_tx_headroom,
check_da, check_sa);
while (!skb_queue_empty(&frame_list)) {
rx->skb = __skb_dequeue(&frame_list);
if (!ieee80211_frame_allowed(rx, fc)) {
dev_kfree_skb(rx->skb);
continue;
}
ieee80211_deliver_skb(rx);
}
return RX_QUEUED;
}
static ieee80211_rx_result debug_noinline
ieee80211_rx_h_amsdu(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;
__le16 fc = hdr->frame_control;
if (!(status->rx_flags & IEEE80211_RX_AMSDU))
return RX_CONTINUE;
if (unlikely(!ieee80211_is_data(fc)))
return RX_CONTINUE;
if (unlikely(!ieee80211_is_data_present(fc)))
return RX_DROP_MONITOR;
if (unlikely(ieee80211_has_a4(hdr->frame_control))) {
switch (rx->sdata->vif.type) {
case NL80211_IFTYPE_AP_VLAN:
if (!rx->sdata->u.vlan.sta)
return RX_DROP_UNUSABLE;
break;
case NL80211_IFTYPE_STATION:
if (!rx->sdata->u.mgd.use_4addr)
return RX_DROP_UNUSABLE;
break;
default:
return RX_DROP_UNUSABLE;
}
}
if (is_multicast_ether_addr(hdr->addr1))
return RX_DROP_UNUSABLE;
return __ieee80211_rx_h_amsdu(rx, 0);
}
#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_if_mesh *ifmsh = &sdata->u.mesh;
u16 ac, q, hdrlen;
hdr = (struct ieee80211_hdr *) skb->data;
hdrlen = ieee80211_hdrlen(hdr->frame_control);
/* make sure fixed part of mesh header is there, also checks skb len */
if (!pskb_may_pull(rx->skb, hdrlen + 6))
return RX_DROP_MONITOR;
mesh_hdr = (struct ieee80211s_hdr *) (skb->data + hdrlen);
/* make sure full mesh header is there, also checks skb len */
if (!pskb_may_pull(rx->skb,
hdrlen + ieee80211_get_mesh_hdrlen(mesh_hdr)))
return RX_DROP_MONITOR;
/* reload pointers */
hdr = (struct ieee80211_hdr *) skb->data;
mesh_hdr = (struct ieee80211s_hdr *) (skb->data + hdrlen);
if (ieee80211_drop_unencrypted(rx, hdr->frame_control))
return RX_DROP_MONITOR;
/* frame is in RMC, don't forward */
if (ieee80211_is_data(hdr->frame_control) &&
is_multicast_ether_addr(hdr->addr1) &&
mesh_rmc_check(rx->sdata, hdr->addr3, mesh_hdr))
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 if ((mesh_hdr->flags & MESH_FLAGS_AE) ==
MESH_FLAGS_AE_A5_A6) {
/* has_a4 already checked in ieee80211_rx_mesh_check */
mpp_addr = hdr->addr4;
proxied_addr = mesh_hdr->eaddr2;
} else {
return RX_DROP_MONITOR;
}
rcu_read_lock();
mppath = mpp_path_lookup(sdata, proxied_addr);
if (!mppath) {
mpp_path_add(sdata, proxied_addr, mpp_addr);
} else {
spin_lock_bh(&mppath->state_lock);
if (!ether_addr_equal(mppath->mpp, mpp_addr))
memcpy(mppath->mpp, mpp_addr, ETH_ALEN);
mppath->exp_time = jiffies;
spin_unlock_bh(&mppath->state_lock);
}
rcu_read_unlock();
}
/* Frame has reached destination. Don't forward */
if (!is_multicast_ether_addr(hdr->addr1) &&
ether_addr_equal(sdata->vif.addr, hdr->addr3))
return RX_CONTINUE;
ac = ieee80211_select_queue_80211(sdata, skb, hdr);
q = sdata->vif.hw_queue[ac];
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 (!--mesh_hdr->ttl) {
IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, dropped_frames_ttl);
goto out;
}
if (!ifmsh->mshcfg.dot11MeshForwarding)
goto out;
fwd_skb = skb_copy_expand(skb, local->tx_headroom +
sdata->encrypt_headroom, 0, GFP_ATOMIC);
if (!fwd_skb)
goto out;
fwd_hdr = (struct ieee80211_hdr *) fwd_skb->data;
fwd_hdr->frame_control &= ~cpu_to_le16(IEEE80211_FCTL_RETRY);
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);
/* update power mode indication when forwarding */
ieee80211_mps_set_frame_flags(sdata, NULL, fwd_hdr);
} else if (!mesh_nexthop_lookup(sdata, fwd_skb)) {
/* mesh power mode flags updated in mesh_nexthop_lookup */
IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, fwded_unicast);
} else {
/* unable to resolve next hop */
mesh_path_error_tx(sdata, ifmsh->mshcfg.element_ttl,
fwd_hdr->addr3, 0,
WLAN_REASON_MESH_PATH_NOFORWARD,
fwd_hdr->addr2);
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))
return RX_CONTINUE;
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;
/* directly handle TDLS channel switch requests/responses */
if (unlikely(((struct ethhdr *)rx->skb->data)->h_proto ==
cpu_to_be16(ETH_P_TDLS))) {
struct ieee80211_tdls_data *tf = (void *)rx->skb->data;
if (pskb_may_pull(rx->skb,
offsetof(struct ieee80211_tdls_data, u)) &&
tf->payload_type == WLAN_TDLS_SNAP_RFTYPE &&
tf->category == WLAN_CATEGORY_TDLS &&
(tf->action_code == WLAN_TDLS_CHANNEL_SWITCH_REQUEST ||
tf->action_code == WLAN_TDLS_CHANNEL_SWITCH_RESPONSE)) {
skb_queue_tail(&local->skb_queue_tdls_chsw, rx->skb);
schedule_work(&local->tdls_chsw_work);
if (rx->sta)
rx->sta->rx_stats.packets++;
return RX_QUEUED;
}
}
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;
if (!ieee80211_hw_check(&local->hw, SUPPORTS_DYNAMIC_PS) &&
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 sk_buff_head *frames)
{
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;
struct ieee80211_event event = {
.type = BAR_RX_EVENT,
};
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;
if (!test_bit(tid, rx->sta->ampdu_mlme.agg_session_valid) &&
!test_and_set_bit(tid, rx->sta->ampdu_mlme.unexpected_agg))
ieee80211_send_delba(rx->sdata, rx->sta->sta.addr, tid,
WLAN_BACK_RECIPIENT,
WLAN_REASON_QSTA_REQUIRE_SETUP);
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;
event.u.ba.tid = tid;
event.u.ba.ssn = start_seq_num;
event.u.ba.sta = &rx->sta->sta;
/* 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(rx->sdata, tid_agg_rx,
start_seq_num, frames);
spin_unlock(&tid_agg_rx->reorder_lock);
drv_event_callback(rx->local, rx->sdata, &event);
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 (!ether_addr_equal(mgmt->da, sdata->vif.addr)) {
/* Not to own unicast address */
return;
}
if (!ether_addr_equal(mgmt->sa, sdata->u.mgd.bssid) ||
!ether_addr_equal(mgmt->bssid, sdata->u.mgd.bssid)) {
/* 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 = skb_put_zero(skb, 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 (ieee80211_hw_check(&rx->local->hw, SIGNAL_DBM) &&
!(status->flag & RX_FLAG_NO_SIGNAL_VAL))
sig = status->signal;
cfg80211_report_obss_beacon(rx->local->hw.wiphy,
rx->skb->data, rx->skb->len,
status->freq, sig);
rx->flags |= IEEE80211_RX_BEACON_REPORTED;
}
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 &&
mgmt->u.action.category != WLAN_CATEGORY_SELF_PROTECTED &&
mgmt->u.action.category != WLAN_CATEGORY_SPECTRUM_MGMT)
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/chanwidth 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;
enum ieee80211_smps_mode smps_mode;
struct sta_opmode_info sta_opmode = {};
/* convert to HT capability */
switch (mgmt->u.action.u.ht_smps.smps_control) {
case WLAN_HT_SMPS_CONTROL_DISABLED:
smps_mode = IEEE80211_SMPS_OFF;
break;
case WLAN_HT_SMPS_CONTROL_STATIC:
smps_mode = IEEE80211_SMPS_STATIC;
break;
case WLAN_HT_SMPS_CONTROL_DYNAMIC:
smps_mode = IEEE80211_SMPS_DYNAMIC;
break;
default:
goto invalid;
}
/* if no change do nothing */
if (rx->sta->sta.smps_mode == smps_mode)
goto handled;
rx->sta->sta.smps_mode = smps_mode;
sta_opmode.smps_mode =
ieee80211_smps_mode_to_smps_mode(smps_mode);
sta_opmode.changed = STA_OPMODE_SMPS_MODE_CHANGED;
sband = rx->local->hw.wiphy->bands[status->band];
rate_control_rate_update(local, sband, rx->sta,
IEEE80211_RC_SMPS_CHANGED);
cfg80211_sta_opmode_change_notify(sdata->dev,
rx->sta->addr,
&sta_opmode,
GFP_KERNEL);
goto handled;
}
case WLAN_HT_ACTION_NOTIFY_CHANWIDTH: {
struct ieee80211_supported_band *sband;
u8 chanwidth = mgmt->u.action.u.ht_notify_cw.chanwidth;
enum ieee80211_sta_rx_bandwidth max_bw, new_bw;
struct sta_opmode_info sta_opmode = {};
/* If it doesn't support 40 MHz it can't change ... */
if (!(rx->sta->sta.ht_cap.cap &
IEEE80211_HT_CAP_SUP_WIDTH_20_40))
goto handled;
if (chanwidth == IEEE80211_HT_CHANWIDTH_20MHZ)
max_bw = IEEE80211_STA_RX_BW_20;
else
max_bw = ieee80211_sta_cap_rx_bw(rx->sta);
/* set cur_max_bandwidth and recalc sta bw */
rx->sta->cur_max_bandwidth = max_bw;
new_bw = ieee80211_sta_cur_vht_bw(rx->sta);
if (rx->sta->sta.bandwidth == new_bw)
goto handled;
rx->sta->sta.bandwidth = new_bw;
sband = rx->local->hw.wiphy->bands[status->band];
sta_opmode.bw =
ieee80211_sta_rx_bw_to_chan_width(rx->sta);
sta_opmode.changed = STA_OPMODE_MAX_BW_CHANGED;
rate_control_rate_update(local, sband, rx->sta,
IEEE80211_RC_BW_CHANGED);
cfg80211_sta_opmode_change_notify(sdata->dev,
rx->sta->addr,
&sta_opmode,
GFP_KERNEL);
goto handled;
}
default:
goto invalid;
}
break;
case WLAN_CATEGORY_PUBLIC:
if (len < IEEE80211_MIN_ACTION_SIZE + 1)
goto invalid;
if (sdata->vif.type != NL80211_IFTYPE_STATION)
break;
if (!rx->sta)
break;
if (!ether_addr_equal(mgmt->bssid, sdata->u.mgd.bssid))
break;
if (mgmt->u.action.u.ext_chan_switch.action_code !=
WLAN_PUB_ACTION_EXT_CHANSW_ANN)
break;
if (len < offsetof(struct ieee80211_mgmt,
u.action.u.ext_chan_switch.variable))
goto invalid;
goto queue;
case WLAN_CATEGORY_VHT:
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)
goto invalid;
switch (mgmt->u.action.u.vht_opmode_notif.action_code) {
case WLAN_VHT_ACTION_OPMODE_NOTIF: {
/* verify opmode is present */
if (len < IEEE80211_MIN_ACTION_SIZE + 2)
goto invalid;
goto queue;
}
case WLAN_VHT_ACTION_GROUPID_MGMT: {
if (len < IEEE80211_MIN_ACTION_SIZE + 25)
goto invalid;
goto queue;
}
default:
break;
}
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:
/* 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 (status->band != NL80211_BAND_5GHZ)
break;
if (len < (IEEE80211_MIN_ACTION_SIZE +
sizeof(mgmt->u.action.u.measurement)))
break;
if (sdata->vif.type != NL80211_IFTYPE_STATION)
break;
ieee80211_process_measurement_req(sdata, mgmt, len);
goto handled;
case WLAN_ACTION_SPCT_CHL_SWITCH: {
u8 *bssid;
if (len < (IEEE80211_MIN_ACTION_SIZE +
sizeof(mgmt->u.action.u.chan_switch)))
break;
if (sdata->vif.type != NL80211_IFTYPE_STATION &&
sdata->vif.type != NL80211_IFTYPE_ADHOC &&
sdata->vif.type != NL80211_IFTYPE_MESH_POINT)
break;
if (sdata->vif.type == NL80211_IFTYPE_STATION)
bssid = sdata->u.mgd.bssid;
else if (sdata->vif.type == NL80211_IFTYPE_ADHOC)
bssid = sdata->u.ibss.bssid;
else if (sdata->vif.type == NL80211_IFTYPE_MESH_POINT)
bssid = mgmt->sa;
else
break;
if (!ether_addr_equal(mgmt->bssid, 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:
if (len < (IEEE80211_MIN_ACTION_SIZE +
sizeof(mgmt->u.action.u.self_prot.action_code)))
break;
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.user_mpm)
/* 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 (len < (IEEE80211_MIN_ACTION_SIZE +
sizeof(mgmt->u.action.u.mesh_action.action_code)))
break;
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_stats.packets++;
dev_kfree_skb(rx->skb);
return RX_QUEUED;
queue:
skb_queue_tail(&sdata->skb_queue, rx->skb);
ieee80211_queue_work(&local->hw, &sdata->work);
if (rx->sta)
rx->sta->rx_stats.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 (ieee80211_hw_check(&rx->local->hw, SIGNAL_DBM) &&
!(status->flag & RX_FLAG_NO_SIGNAL_VAL))
sig = status->signal;
if (cfg80211_rx_mgmt(&rx->sdata->wdev, status->freq, sig,
rx->skb->data, rx->skb->len, 0)) {
if (rx->sta)
rx->sta->rx_stats.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
* 802.11-2012 9.24.4.
* 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;
if (is_multicast_ether_addr(mgmt->da))
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));
if (rx->sdata->vif.type == NL80211_IFTYPE_P2P_DEVICE) {
struct ieee80211_tx_info *info = IEEE80211_SKB_CB(nskb);
info->flags = IEEE80211_TX_CTL_TX_OFFCHAN |
IEEE80211_TX_INTFL_OFFCHAN_TX_OK |
IEEE80211_TX_CTL_NO_CCK_RATE;
if (ieee80211_hw_check(&local->hw, QUEUE_CONTROL))
info->hw_queue =
local->hw.offchannel_tx_hw_queue;
}
__ieee80211_tx_skb_tid_band(rx->sdata, nskb, 7,
status->band);
}
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_OCB &&
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 and mesh */
if (sdata->vif.type != NL80211_IFTYPE_ADHOC &&
sdata->vif.type != NL80211_IFTYPE_MESH_POINT)
return RX_DROP_MONITOR;
break;
default:
return RX_DROP_MONITOR;
}
/* queue up frame and kick off work to process it */
skb_queue_tail(&sdata->skb_queue, rx->skb);
ieee80211_queue_work(&rx->local->hw, &sdata->work);
if (rx->sta)
rx->sta->rx_stats.packets++;
return RX_QUEUED;
}
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;
/* vendor data is long removed here */
status->flag &= ~RX_FLAG_RADIOTAP_VENDOR_DATA;
/* room for the radiotap header based on driver features */
needed_headroom = ieee80211_rx_radiotap_hdrlen(local, status, skb);
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,
false);
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 (!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;
ieee80211_rx_stats(sdata->dev, 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_stats.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->encoding == RX_ENC_HT) &&
!(status->encoding == RX_ENC_VHT))
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_stats.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,
struct sk_buff_head *frames)
{
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)
/* Lock here to avoid hitting all of the data used in the RX
* path (e.g. key data, station data, ...) concurrently when
* a frame is released from the reorder buffer due to timeout
* from the timer, potentially concurrently with RX from the
* driver.
*/
spin_lock_bh(&rx->local->rx_path_lock);
while ((skb = __skb_dequeue(frames))) {
/*
* 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_check_more_data);
CALL_RXH(ieee80211_rx_h_uapsd_and_pspoll);
CALL_RXH(ieee80211_rx_h_sta_process);
CALL_RXH(ieee80211_rx_h_decrypt);
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);
/* special treatment -- needs the queue */
res = ieee80211_rx_h_ctrl(rx, frames);
if (res != RX_CONTINUE)
goto rxh_next;
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);
#undef CALL_RXH
}
spin_unlock_bh(&rx->local->rx_path_lock);
}
static void ieee80211_invoke_rx_handlers(struct ieee80211_rx_data *rx)
{
struct sk_buff_head reorder_release;
ieee80211_rx_result res = RX_DROP_MONITOR;
__skb_queue_head_init(&reorder_release);
#define CALL_RXH(rxh) \
do { \
res = rxh(rx); \
if (res != RX_CONTINUE) \
goto rxh_next; \
} while (0)
CALL_RXH(ieee80211_rx_h_check_dup);
CALL_RXH(ieee80211_rx_h_check);
ieee80211_rx_reorder_ampdu(rx, &reorder_release);
ieee80211_rx_handlers(rx, &reorder_release);
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 sk_buff_head frames;
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,
.napi = NULL, /* must be NULL to not have races */
};
struct tid_ampdu_rx *tid_agg_rx;
tid_agg_rx = rcu_dereference(sta->ampdu_mlme.tid_rx[tid]);
if (!tid_agg_rx)
return;
__skb_queue_head_init(&frames);
spin_lock(&tid_agg_rx->reorder_lock);
ieee80211_sta_reorder_release(sta->sdata, tid_agg_rx, &frames);
spin_unlock(&tid_agg_rx->reorder_lock);
if (!skb_queue_empty(&frames)) {
struct ieee80211_event event = {
.type = BA_FRAME_TIMEOUT,
.u.ba.tid = tid,
.u.ba.sta = &sta->sta,
};
drv_event_callback(rx.local, rx.sdata, &event);
}
ieee80211_rx_handlers(&rx, &frames);
}
void ieee80211_mark_rx_ba_filtered_frames(struct ieee80211_sta *pubsta, u8 tid,
u16 ssn, u64 filtered,
u16 received_mpdus)
{
struct sta_info *sta;
struct tid_ampdu_rx *tid_agg_rx;
struct sk_buff_head frames;
struct ieee80211_rx_data rx = {
/* This is OK -- must be QoS data frame */
.security_idx = tid,
.seqno_idx = tid,
};
int i, diff;
if (WARN_ON(!pubsta || tid >= IEEE80211_NUM_TIDS))
return;
__skb_queue_head_init(&frames);
sta = container_of(pubsta, struct sta_info, sta);
rx.sta = sta;
rx.sdata = sta->sdata;
rx.local = sta->local;
rcu_read_lock();
tid_agg_rx = rcu_dereference(sta->ampdu_mlme.tid_rx[tid]);
if (!tid_agg_rx)
goto out;
spin_lock_bh(&tid_agg_rx->reorder_lock);
if (received_mpdus >= IEEE80211_SN_MODULO >> 1) {
int release;
/* release all frames in the reorder buffer */
release = (tid_agg_rx->head_seq_num + tid_agg_rx->buf_size) %
IEEE80211_SN_MODULO;
ieee80211_release_reorder_frames(sta->sdata, tid_agg_rx,
release, &frames);
/* update ssn to match received ssn */
tid_agg_rx->head_seq_num = ssn;
} else {
ieee80211_release_reorder_frames(sta->sdata, tid_agg_rx, ssn,
&frames);
}
/* handle the case that received ssn is behind the mac ssn.
* it can be tid_agg_rx->buf_size behind and still be valid */
diff = (tid_agg_rx->head_seq_num - ssn) & IEEE80211_SN_MASK;
if (diff >= tid_agg_rx->buf_size) {
tid_agg_rx->reorder_buf_filtered = 0;
goto release;
}
filtered = filtered >> diff;
ssn += diff;
/* update bitmap */
for (i = 0; i < tid_agg_rx->buf_size; i++) {
int index = (ssn + i) % tid_agg_rx->buf_size;
tid_agg_rx->reorder_buf_filtered &= ~BIT_ULL(index);
if (filtered & BIT_ULL(i))
tid_agg_rx->reorder_buf_filtered |= BIT_ULL(index);
}
/* now process also frames that the filter marking released */
ieee80211_sta_reorder_release(sta->sdata, tid_agg_rx, &frames);
release:
spin_unlock_bh(&tid_agg_rx->reorder_lock);
ieee80211_rx_handlers(&rx, &frames);
out:
rcu_read_unlock();
}
EXPORT_SYMBOL(ieee80211_mark_rx_ba_filtered_frames);
/* main receive path */
static bool ieee80211_accept_frame(struct ieee80211_rx_data *rx)
{
struct ieee80211_sub_if_data *sdata = rx->sdata;
struct sk_buff *skb = rx->skb;
struct ieee80211_hdr *hdr = (void *)skb->data;
struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
u8 *bssid = ieee80211_get_bssid(hdr, skb->len, sdata->vif.type);
bool multicast = is_multicast_ether_addr(hdr->addr1);
switch (sdata->vif.type) {
case NL80211_IFTYPE_STATION:
if (!bssid && !sdata->u.mgd.use_4addr)
return false;
if (multicast)
return true;
return ether_addr_equal(sdata->vif.addr, hdr->addr1);
case NL80211_IFTYPE_ADHOC:
if (!bssid)
return false;
if (ether_addr_equal(sdata->vif.addr, hdr->addr2) ||
ether_addr_equal(sdata->u.ibss.bssid, hdr->addr2))
return false;
if (ieee80211_is_beacon(hdr->frame_control))
return true;
if (!ieee80211_bssid_match(bssid, sdata->u.ibss.bssid))
return false;
if (!multicast &&
!ether_addr_equal(sdata->vif.addr, hdr->addr1))
return false;
if (!rx->sta) {
int rate_idx;
if (status->encoding != RX_ENC_LEGACY)
rate_idx = 0; /* TODO: HT/VHT rates */
else
rate_idx = status->rate_idx;
ieee80211_ibss_rx_no_sta(sdata, bssid, hdr->addr2,
BIT(rate_idx));
}
return true;
case NL80211_IFTYPE_OCB:
if (!bssid)
return false;
if (!ieee80211_is_data_present(hdr->frame_control))
return false;
if (!is_broadcast_ether_addr(bssid))
return false;
if (!multicast &&
!ether_addr_equal(sdata->dev->dev_addr, hdr->addr1))
return false;
if (!rx->sta) {
int rate_idx;
if (status->encoding != RX_ENC_LEGACY)
rate_idx = 0; /* TODO: HT rates */
else
rate_idx = status->rate_idx;
ieee80211_ocb_rx_no_sta(sdata, bssid, hdr->addr2,
BIT(rate_idx));
}
return true;
case NL80211_IFTYPE_MESH_POINT:
if (ether_addr_equal(sdata->vif.addr, hdr->addr2))
return false;
if (multicast)
return true;
return ether_addr_equal(sdata->vif.addr, hdr->addr1);
case NL80211_IFTYPE_AP_VLAN:
case NL80211_IFTYPE_AP:
if (!bssid)
return ether_addr_equal(sdata->vif.addr, hdr->addr1);
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 (!multicast &&
!ether_addr_equal(sdata->vif.addr, hdr->addr1))
return false;
if (ieee80211_is_public_action(hdr, skb->len))
return true;
return ieee80211_is_beacon(hdr->frame_control);
}
if (!ieee80211_has_tods(hdr->frame_control)) {
/* ignore data frames to TDLS-peers */
if (ieee80211_is_data(hdr->frame_control))
return false;
/* ignore action frames to TDLS-peers */
if (ieee80211_is_action(hdr->frame_control) &&
!is_broadcast_ether_addr(bssid) &&
!ether_addr_equal(bssid, hdr->addr1))
return false;
}
/*
* 802.11-2016 Table 9-26 says that for data frames, A1 must be
* the BSSID - we've checked that already but may have accepted
* the wildcard (ff:ff:ff:ff:ff:ff).
*
* It also says:
* The BSSID of the Data frame is determined as follows:
* a) If the STA is contained within an AP or is associated
* with an AP, the BSSID is the address currently in use
* by the STA contained in the AP.
*
* So we should not accept data frames with an address that's
* multicast.
*
* Accepting it also opens a security problem because stations
* could encrypt it with the GTK and inject traffic that way.
*/
if (ieee80211_is_data(hdr->frame_control) && multicast)
return false;
return true;
case NL80211_IFTYPE_WDS:
if (bssid || !ieee80211_is_data(hdr->frame_control))
return false;
return ether_addr_equal(sdata->u.wds.remote_addr, hdr->addr2);
case NL80211_IFTYPE_P2P_DEVICE:
return ieee80211_is_public_action(hdr, skb->len) ||
ieee80211_is_probe_req(hdr->frame_control) ||
ieee80211_is_probe_resp(hdr->frame_control) ||
ieee80211_is_beacon(hdr->frame_control);
case NL80211_IFTYPE_NAN:
/* Currently no frames on NAN interface are allowed */
return false;
default:
break;
}
WARN_ON_ONCE(1);
return false;
}
void ieee80211_check_fast_rx(struct sta_info *sta)
{
struct ieee80211_sub_if_data *sdata = sta->sdata;
struct ieee80211_local *local = sdata->local;
struct ieee80211_key *key;
struct ieee80211_fast_rx fastrx = {
.dev = sdata->dev,
.vif_type = sdata->vif.type,
.control_port_protocol = sdata->control_port_protocol,
}, *old, *new = NULL;
bool assign = false;
/* use sparse to check that we don't return without updating */
__acquire(check_fast_rx);
BUILD_BUG_ON(sizeof(fastrx.rfc1042_hdr) != sizeof(rfc1042_header));
BUILD_BUG_ON(sizeof(fastrx.rfc1042_hdr) != ETH_ALEN);
ether_addr_copy(fastrx.rfc1042_hdr, rfc1042_header);
ether_addr_copy(fastrx.vif_addr, sdata->vif.addr);
fastrx.uses_rss = ieee80211_hw_check(&local->hw, USES_RSS);
/* fast-rx doesn't do reordering */
if (ieee80211_hw_check(&local->hw, AMPDU_AGGREGATION) &&
!ieee80211_hw_check(&local->hw, SUPPORTS_REORDERING_BUFFER))
goto clear;
switch (sdata->vif.type) {
case NL80211_IFTYPE_STATION:
if (sta->sta.tdls) {
fastrx.da_offs = offsetof(struct ieee80211_hdr, addr1);
fastrx.sa_offs = offsetof(struct ieee80211_hdr, addr2);
fastrx.expected_ds_bits = 0;
} else {
fastrx.sta_notify = sdata->u.mgd.probe_send_count > 0;
fastrx.da_offs = offsetof(struct ieee80211_hdr, addr1);
fastrx.sa_offs = offsetof(struct ieee80211_hdr, addr3);
fastrx.expected_ds_bits =
cpu_to_le16(IEEE80211_FCTL_FROMDS);
}
if (sdata->u.mgd.use_4addr && !sta->sta.tdls) {
fastrx.expected_ds_bits |=
cpu_to_le16(IEEE80211_FCTL_TODS);
fastrx.da_offs = offsetof(struct ieee80211_hdr, addr3);
fastrx.sa_offs = offsetof(struct ieee80211_hdr, addr4);
}
if (!sdata->u.mgd.powersave)
break;
/* software powersave is a huge mess, avoid all of it */
if (ieee80211_hw_check(&local->hw, PS_NULLFUNC_STACK))
goto clear;
if (ieee80211_hw_check(&local->hw, SUPPORTS_PS) &&
!ieee80211_hw_check(&local->hw, SUPPORTS_DYNAMIC_PS))
goto clear;
break;
case NL80211_IFTYPE_AP_VLAN:
case NL80211_IFTYPE_AP:
/* parallel-rx requires this, at least with calls to
* ieee80211_sta_ps_transition()
*/
if (!ieee80211_hw_check(&local->hw, AP_LINK_PS))
goto clear;
fastrx.da_offs = offsetof(struct ieee80211_hdr, addr3);
fastrx.sa_offs = offsetof(struct ieee80211_hdr, addr2);
fastrx.expected_ds_bits = cpu_to_le16(IEEE80211_FCTL_TODS);
fastrx.internal_forward =
!(sdata->flags & IEEE80211_SDATA_DONT_BRIDGE_PACKETS) &&
(sdata->vif.type != NL80211_IFTYPE_AP_VLAN ||
!sdata->u.vlan.sta);
if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
sdata->u.vlan.sta) {
fastrx.expected_ds_bits |=
cpu_to_le16(IEEE80211_FCTL_FROMDS);
fastrx.sa_offs = offsetof(struct ieee80211_hdr, addr4);
fastrx.internal_forward = 0;
}
break;
default:
goto clear;
}
if (!test_sta_flag(sta, WLAN_STA_AUTHORIZED))
goto clear;
rcu_read_lock();
key = rcu_dereference(sta->ptk[sta->ptk_idx]);
if (key) {
switch (key->conf.cipher) {
case WLAN_CIPHER_SUITE_TKIP:
/* we don't want to deal with MMIC in fast-rx */
goto clear_rcu;
case WLAN_CIPHER_SUITE_CCMP:
case WLAN_CIPHER_SUITE_CCMP_256:
case WLAN_CIPHER_SUITE_GCMP:
case WLAN_CIPHER_SUITE_GCMP_256:
break;
default:
/* we also don't want to deal with WEP or cipher scheme
* since those require looking up the key idx in the
* frame, rather than assuming the PTK is used
* (we need to revisit this once we implement the real
* PTK index, which is now valid in the spec, but we
* haven't implemented that part yet)
*/
goto clear_rcu;
}
fastrx.key = true;
fastrx.icv_len = key->conf.icv_len;
}
assign = true;
clear_rcu:
rcu_read_unlock();
clear:
__release(check_fast_rx);
if (assign)
new = kmemdup(&fastrx, sizeof(fastrx), GFP_KERNEL);
spin_lock_bh(&sta->lock);
old = rcu_dereference_protected(sta->fast_rx, true);
rcu_assign_pointer(sta->fast_rx, new);
spin_unlock_bh(&sta->lock);
if (old)
kfree_rcu(old, rcu_head);
}
void ieee80211_clear_fast_rx(struct sta_info *sta)
{
struct ieee80211_fast_rx *old;
spin_lock_bh(&sta->lock);
old = rcu_dereference_protected(sta->fast_rx, true);
RCU_INIT_POINTER(sta->fast_rx, NULL);
spin_unlock_bh(&sta->lock);
if (old)
kfree_rcu(old, rcu_head);
}
void __ieee80211_check_fast_rx_iface(struct ieee80211_sub_if_data *sdata)
{
struct ieee80211_local *local = sdata->local;
struct sta_info *sta;
lockdep_assert_held(&local->sta_mtx);
list_for_each_entry_rcu(sta, &local->sta_list, list) {
if (sdata != sta->sdata &&
(!sta->sdata->bss || sta->sdata->bss != sdata->bss))
continue;
ieee80211_check_fast_rx(sta);
}
}
void ieee80211_check_fast_rx_iface(struct ieee80211_sub_if_data *sdata)
{
struct ieee80211_local *local = sdata->local;
mutex_lock(&local->sta_mtx);
__ieee80211_check_fast_rx_iface(sdata);
mutex_unlock(&local->sta_mtx);
}
static bool ieee80211_invoke_fast_rx(struct ieee80211_rx_data *rx,
struct ieee80211_fast_rx *fast_rx)
{
struct sk_buff *skb = rx->skb;
struct ieee80211_hdr *hdr = (void *)skb->data;
struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
struct sta_info *sta = rx->sta;
int orig_len = skb->len;
int hdrlen = ieee80211_hdrlen(hdr->frame_control);
int snap_offs = hdrlen;
struct {
u8 snap[sizeof(rfc1042_header)];
__be16 proto;
} *payload __aligned(2);
struct {
u8 da[ETH_ALEN];
u8 sa[ETH_ALEN];
} addrs __aligned(2);
struct ieee80211_sta_rx_stats *stats = &sta->rx_stats;
if (fast_rx->uses_rss)
stats = this_cpu_ptr(sta->pcpu_rx_stats);
/* for parallel-rx, we need to have DUP_VALIDATED, otherwise we write
* to a common data structure; drivers can implement that per queue
* but we don't have that information in mac80211
*/
if (!(status->flag & RX_FLAG_DUP_VALIDATED))
return false;
#define FAST_RX_CRYPT_FLAGS (RX_FLAG_PN_VALIDATED | RX_FLAG_DECRYPTED)
/* If using encryption, we also need to have:
* - PN_VALIDATED: similar, but the implementation is tricky
* - DECRYPTED: necessary for PN_VALIDATED
*/
if (fast_rx->key &&
(status->flag & FAST_RX_CRYPT_FLAGS) != FAST_RX_CRYPT_FLAGS)
return false;
if (unlikely(!ieee80211_is_data_present(hdr->frame_control)))
return false;
if (unlikely(ieee80211_is_frag(hdr)))
return false;
/* Since our interface address cannot be multicast, this
* implicitly also rejects multicast frames without the
* explicit check.
*
* We shouldn't get any *data* frames not addressed to us
* (AP mode will accept multicast *management* frames), but
* punting here will make it go through the full checks in
* ieee80211_accept_frame().
*/
if (!ether_addr_equal(fast_rx->vif_addr, hdr->addr1))
return false;
if ((hdr->frame_control & cpu_to_le16(IEEE80211_FCTL_FROMDS |
IEEE80211_FCTL_TODS)) !=
fast_rx->expected_ds_bits)
return false;
/* assign the key to drop unencrypted frames (later)
* and strip the IV/MIC if necessary
*/
if (fast_rx->key && !(status->flag & RX_FLAG_IV_STRIPPED)) {
/* GCMP header length is the same */
snap_offs += IEEE80211_CCMP_HDR_LEN;
}
if (!(status->rx_flags & IEEE80211_RX_AMSDU)) {
if (!pskb_may_pull(skb, snap_offs + sizeof(*payload)))
goto drop;
payload = (void *)(skb->data + snap_offs);
if (!ether_addr_equal(payload->snap, fast_rx->rfc1042_hdr))
return false;
/* Don't handle these here since they require special code.
* Accept AARP and IPX even though they should come with a
* bridge-tunnel header - but if we get them this way then
* there's little point in discarding them.
*/
if (unlikely(payload->proto == cpu_to_be16(ETH_P_TDLS) ||
payload->proto == fast_rx->control_port_protocol))
return false;
}
/* after this point, don't punt to the slowpath! */
if (rx->key && !(status->flag & RX_FLAG_MIC_STRIPPED) &&
pskb_trim(skb, skb->len - fast_rx->icv_len))
goto drop;
if (unlikely(fast_rx->sta_notify)) {
ieee80211_sta_rx_notify(rx->sdata, hdr);
fast_rx->sta_notify = false;
}
/* statistics part of ieee80211_rx_h_sta_process() */
if (!(status->flag & RX_FLAG_NO_SIGNAL_VAL)) {
stats->last_signal = status->signal;
if (!fast_rx->uses_rss)
ewma_signal_add(&sta->rx_stats_avg.signal,
-status->signal);
}
if (status->chains) {
int i;
stats->chains = status->chains;
for (i = 0; i < ARRAY_SIZE(status->chain_signal); i++) {
int signal = status->chain_signal[i];
if (!(status->chains & BIT(i)))
continue;
stats->chain_signal_last[i] = signal;
if (!fast_rx->uses_rss)
ewma_signal_add(&sta->rx_stats_avg.chain_signal[i],
-signal);
}
}
/* end of statistics */
if (rx->key && !ieee80211_has_protected(hdr->frame_control))
goto drop;
if (status->rx_flags & IEEE80211_RX_AMSDU) {
if (__ieee80211_rx_h_amsdu(rx, snap_offs - hdrlen) !=
RX_QUEUED)
goto drop;
return true;
}
stats->last_rx = jiffies;
stats->last_rate = sta_stats_encode_rate(status);
stats->fragments++;
stats->packets++;
/* do the header conversion - first grab the addresses */
ether_addr_copy(addrs.da, skb->data + fast_rx->da_offs);
ether_addr_copy(addrs.sa, skb->data + fast_rx->sa_offs);
/* remove the SNAP but leave the ethertype */
skb_pull(skb, snap_offs + sizeof(rfc1042_header));
/* push the addresses in front */
memcpy(skb_push(skb, sizeof(addrs)), &addrs, sizeof(addrs));
skb->dev = fast_rx->dev;
ieee80211_rx_stats(fast_rx->dev, skb->len);
/* The seqno index has the same property as needed
* for the rx_msdu field, i.e. it is IEEE80211_NUM_TIDS
* for non-QoS-data frames. Here we know it's a data
* frame, so count MSDUs.
*/
u64_stats_update_begin(&stats->syncp);
stats->msdu[rx->seqno_idx]++;
stats->bytes += orig_len;
u64_stats_update_end(&stats->syncp);
if (fast_rx->internal_forward) {
struct sk_buff *xmit_skb = NULL;
bool multicast = is_multicast_ether_addr(skb->data);
if (multicast) {
xmit_skb = skb_copy(skb, GFP_ATOMIC);
} else if (sta_info_get(rx->sdata, skb->data)) {
xmit_skb = skb;
skb = NULL;
}
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);
}
if (!skb)
return true;
}
/* deliver to local stack */
skb->protocol = eth_type_trans(skb, fast_rx->dev);
memset(skb->cb, 0, sizeof(skb->cb));
if (rx->napi)
napi_gro_receive(rx->napi, skb);
else
netif_receive_skb(skb);
return true;
drop:
dev_kfree_skb(skb);
stats->dropped++;
return true;
}
/*
* 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;
rx->skb = skb;
/* See if we can do fast-rx; if we have to copy we already lost,
* so punt in that case. We should never have to deliver a data
* frame to multiple interfaces anyway.
*
* We skip the ieee80211_accept_frame() call and do the necessary
* checking inside ieee80211_invoke_fast_rx().
*/
if (consume && rx->sta) {
struct ieee80211_fast_rx *fast_rx;
fast_rx = rcu_dereference(rx->sta->fast_rx);
if (fast_rx && ieee80211_invoke_fast_rx(rx, fast_rx))
return true;
}
if (!ieee80211_accept_frame(rx))
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 belongs to Rx path it must
* be called with rcu_read_lock protection.
*/
static void __ieee80211_rx_handle_packet(struct ieee80211_hw *hw,
struct ieee80211_sta *pubsta,
struct sk_buff *skb,
struct napi_struct *napi)
{
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 rhlist_head *tmp;
int err = 0;
fc = ((struct ieee80211_hdr *)skb->data)->frame_control;
memset(&rx, 0, sizeof(rx));
rx.skb = skb;
rx.local = local;
rx.napi = napi;
if (ieee80211_is_data(fc) || ieee80211_is_mgmt(fc))
I802_DEBUG_INC(local->dot11ReceivedFragmentCount);
if (ieee80211_is_mgmt(fc)) {
/* drop frame if too short for header */
if (skb->len < ieee80211_hdrlen(fc))
err = -ENOBUFS;
else
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 (unlikely(ieee80211_is_probe_resp(hdr->frame_control) ||
ieee80211_is_beacon(hdr->frame_control)))
ieee80211_scan_rx(local, skb);
if (ieee80211_is_data(fc)) {
struct sta_info *sta, *prev_sta;
if (pubsta) {
rx.sta = container_of(pubsta, struct sta_info, sta);
rx.sdata = rx.sta->sdata;
if (ieee80211_prepare_and_rx_handle(&rx, skb, true))
return;
goto out;
}
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_napi(struct ieee80211_hw *hw, struct ieee80211_sta *pubsta,
struct sk_buff *skb, struct napi_struct *napi)
{
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 >= NUM_NL80211_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;
/* We might be during a HW reconfig, prevent Rx for the same reason */
if (unlikely(local->in_reconfig))
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.
*/
switch (status->encoding) {
case RX_ENC_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 > 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;
break;
case RX_ENC_VHT:
if (WARN_ONCE(status->rate_idx > 9 ||
!status->nss ||
status->nss > 8,
"Rate marked as a VHT rate but data is invalid: MCS: %d, NSS: %d\n",
status->rate_idx, status->nss))
goto drop;
break;
default:
WARN_ON_ONCE(1);
/* fall through */
case RX_ENC_LEGACY:
if (WARN_ON(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, pubsta, skb, napi);
rcu_read_unlock();
return;
drop:
kfree_skb(skb);
}
EXPORT_SYMBOL(ieee80211_rx_napi);
/* 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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