![Johannes Berg](/assets/img/avatar_default.png)
Driver authors should be aware of the alignment requirements, but not everybody cares about the warning. This patch makes it depend on a new Kconfig symbol MAC80211_DEBUG_PACKET_ALIGNMENT which can be enabled regardless of MAC80211_DEBUG and is recommended for driver authors (only). This also restricts the warning to data packets so other packets need not be realigned to not trigger the warning. Signed-off-by: Johannes Berg <johannes@sipsolutions.net> Signed-off-by: John W. Linville <linville@tuxdriver.com>
2069 lines
57 KiB
C
2069 lines
57 KiB
C
/*
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* Copyright 2002-2005, Instant802 Networks, Inc.
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* Copyright 2005-2006, Devicescape Software, Inc.
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* Copyright 2006-2007 Jiri Benc <jbenc@suse.cz>
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* Copyright 2007 Johannes Berg <johannes@sipsolutions.net>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#include <linux/kernel.h>
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#include <linux/skbuff.h>
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#include <linux/netdevice.h>
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#include <linux/etherdevice.h>
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#include <linux/rcupdate.h>
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#include <net/mac80211.h>
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#include <net/ieee80211_radiotap.h>
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#include "ieee80211_i.h"
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#include "ieee80211_led.h"
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#include "wep.h"
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#include "wpa.h"
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#include "tkip.h"
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#include "wme.h"
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u8 ieee80211_sta_manage_reorder_buf(struct ieee80211_hw *hw,
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struct tid_ampdu_rx *tid_agg_rx,
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struct sk_buff *skb, u16 mpdu_seq_num,
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int bar_req);
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/*
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* monitor mode reception
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*
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* This function cleans up the SKB, i.e. it removes all the stuff
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* only useful for monitoring.
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*/
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static struct sk_buff *remove_monitor_info(struct ieee80211_local *local,
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struct sk_buff *skb,
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int rtap_len)
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{
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skb_pull(skb, rtap_len);
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if (local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS) {
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if (likely(skb->len > FCS_LEN))
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skb_trim(skb, skb->len - FCS_LEN);
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else {
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/* driver bug */
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WARN_ON(1);
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dev_kfree_skb(skb);
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skb = NULL;
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}
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}
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return skb;
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}
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static inline int should_drop_frame(struct ieee80211_rx_status *status,
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struct sk_buff *skb,
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int present_fcs_len,
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int radiotap_len)
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{
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struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
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if (status->flag & (RX_FLAG_FAILED_FCS_CRC | RX_FLAG_FAILED_PLCP_CRC))
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return 1;
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if (unlikely(skb->len < 16 + present_fcs_len + radiotap_len))
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return 1;
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if (((hdr->frame_control & cpu_to_le16(IEEE80211_FCTL_FTYPE)) ==
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cpu_to_le16(IEEE80211_FTYPE_CTL)) &&
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((hdr->frame_control & cpu_to_le16(IEEE80211_FCTL_STYPE)) !=
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cpu_to_le16(IEEE80211_STYPE_PSPOLL)) &&
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((hdr->frame_control & cpu_to_le16(IEEE80211_FCTL_STYPE)) !=
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cpu_to_le16(IEEE80211_STYPE_BACK_REQ)))
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return 1;
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return 0;
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}
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/*
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* This function copies a received frame to all monitor interfaces and
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* returns a cleaned-up SKB that no longer includes the FCS nor the
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* radiotap header the driver might have added.
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*/
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static struct sk_buff *
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ieee80211_rx_monitor(struct ieee80211_local *local, struct sk_buff *origskb,
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struct ieee80211_rx_status *status)
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{
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struct ieee80211_sub_if_data *sdata;
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struct ieee80211_rate *rate;
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int needed_headroom = 0;
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struct ieee80211_radiotap_header *rthdr;
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__le64 *rttsft = NULL;
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struct ieee80211_rtap_fixed_data {
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u8 flags;
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u8 rate;
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__le16 chan_freq;
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__le16 chan_flags;
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u8 antsignal;
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u8 padding_for_rxflags;
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__le16 rx_flags;
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} __attribute__ ((packed)) *rtfixed;
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struct sk_buff *skb, *skb2;
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struct net_device *prev_dev = NULL;
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int present_fcs_len = 0;
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int rtap_len = 0;
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/*
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* First, we may need to make a copy of the skb because
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* (1) we need to modify it for radiotap (if not present), and
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* (2) the other RX handlers will modify the skb we got.
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*
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* We don't need to, of course, if we aren't going to return
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* the SKB because it has a bad FCS/PLCP checksum.
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*/
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if (status->flag & RX_FLAG_RADIOTAP)
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rtap_len = ieee80211_get_radiotap_len(origskb->data);
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else
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/* room for radiotap header, always present fields and TSFT */
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needed_headroom = sizeof(*rthdr) + sizeof(*rtfixed) + 8;
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if (local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS)
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present_fcs_len = FCS_LEN;
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if (!local->monitors) {
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if (should_drop_frame(status, origskb, present_fcs_len,
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rtap_len)) {
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dev_kfree_skb(origskb);
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return NULL;
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}
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return remove_monitor_info(local, origskb, rtap_len);
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}
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if (should_drop_frame(status, origskb, present_fcs_len, rtap_len)) {
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/* only need to expand headroom if necessary */
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skb = origskb;
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origskb = NULL;
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/*
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* This shouldn't trigger often because most devices have an
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* RX header they pull before we get here, and that should
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* be big enough for our radiotap information. We should
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* probably export the length to drivers so that we can have
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* them allocate enough headroom to start with.
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*/
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if (skb_headroom(skb) < needed_headroom &&
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pskb_expand_head(skb, needed_headroom, 0, GFP_ATOMIC)) {
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dev_kfree_skb(skb);
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return NULL;
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}
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} else {
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/*
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* Need to make a copy and possibly remove radiotap header
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* and FCS from the original.
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*/
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skb = skb_copy_expand(origskb, needed_headroom, 0, GFP_ATOMIC);
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origskb = remove_monitor_info(local, origskb, rtap_len);
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if (!skb)
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return origskb;
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}
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/* if necessary, prepend radiotap information */
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if (!(status->flag & RX_FLAG_RADIOTAP)) {
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rtfixed = (void *) skb_push(skb, sizeof(*rtfixed));
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rtap_len = sizeof(*rthdr) + sizeof(*rtfixed);
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if (status->flag & RX_FLAG_TSFT) {
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rttsft = (void *) skb_push(skb, sizeof(*rttsft));
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rtap_len += 8;
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}
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rthdr = (void *) skb_push(skb, sizeof(*rthdr));
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memset(rthdr, 0, sizeof(*rthdr));
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memset(rtfixed, 0, sizeof(*rtfixed));
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rthdr->it_present =
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cpu_to_le32((1 << IEEE80211_RADIOTAP_FLAGS) |
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(1 << IEEE80211_RADIOTAP_RATE) |
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(1 << IEEE80211_RADIOTAP_CHANNEL) |
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(1 << IEEE80211_RADIOTAP_DB_ANTSIGNAL) |
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(1 << IEEE80211_RADIOTAP_RX_FLAGS));
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rtfixed->flags = 0;
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if (local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS)
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rtfixed->flags |= IEEE80211_RADIOTAP_F_FCS;
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if (rttsft) {
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*rttsft = cpu_to_le64(status->mactime);
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rthdr->it_present |=
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cpu_to_le32(1 << IEEE80211_RADIOTAP_TSFT);
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}
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/* FIXME: when radiotap gets a 'bad PLCP' flag use it here */
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rtfixed->rx_flags = 0;
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if (status->flag &
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(RX_FLAG_FAILED_FCS_CRC | RX_FLAG_FAILED_PLCP_CRC))
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rtfixed->rx_flags |=
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cpu_to_le16(IEEE80211_RADIOTAP_F_RX_BADFCS);
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rate = ieee80211_get_rate(local, status->phymode,
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status->rate);
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if (rate)
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rtfixed->rate = rate->rate / 5;
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rtfixed->chan_freq = cpu_to_le16(status->freq);
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if (status->phymode == MODE_IEEE80211A)
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rtfixed->chan_flags =
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cpu_to_le16(IEEE80211_CHAN_OFDM |
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IEEE80211_CHAN_5GHZ);
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else
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rtfixed->chan_flags =
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cpu_to_le16(IEEE80211_CHAN_DYN |
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IEEE80211_CHAN_2GHZ);
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rtfixed->antsignal = status->ssi;
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rthdr->it_len = cpu_to_le16(rtap_len);
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}
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skb_reset_mac_header(skb);
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skb->ip_summed = CHECKSUM_UNNECESSARY;
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skb->pkt_type = PACKET_OTHERHOST;
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skb->protocol = htons(ETH_P_802_2);
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list_for_each_entry_rcu(sdata, &local->interfaces, list) {
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if (!netif_running(sdata->dev))
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continue;
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if (sdata->vif.type != IEEE80211_IF_TYPE_MNTR)
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continue;
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if (prev_dev) {
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skb2 = skb_clone(skb, GFP_ATOMIC);
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if (skb2) {
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skb2->dev = prev_dev;
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netif_rx(skb2);
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}
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}
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prev_dev = sdata->dev;
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sdata->dev->stats.rx_packets++;
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sdata->dev->stats.rx_bytes += skb->len;
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}
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if (prev_dev) {
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skb->dev = prev_dev;
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netif_rx(skb);
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} else
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dev_kfree_skb(skb);
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return origskb;
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}
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/* pre-rx handlers
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*
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* these don't have dev/sdata fields in the rx data
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* The sta value should also not be used because it may
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* be NULL even though a STA (in IBSS mode) will be added.
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*/
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static ieee80211_txrx_result
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ieee80211_rx_h_parse_qos(struct ieee80211_txrx_data *rx)
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{
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u8 *data = rx->skb->data;
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int tid;
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/* does the frame have a qos control field? */
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if (WLAN_FC_IS_QOS_DATA(rx->fc)) {
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u8 *qc = data + ieee80211_get_hdrlen(rx->fc) - QOS_CONTROL_LEN;
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/* frame has qos control */
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tid = qc[0] & QOS_CONTROL_TID_MASK;
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if (qc[0] & IEEE80211_QOS_CONTROL_A_MSDU_PRESENT)
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rx->flags |= IEEE80211_TXRXD_RX_AMSDU;
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else
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rx->flags &= ~IEEE80211_TXRXD_RX_AMSDU;
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} else {
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if (unlikely((rx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_MGMT)) {
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/* Separate TID for management frames */
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tid = NUM_RX_DATA_QUEUES - 1;
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} else {
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/* no qos control present */
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tid = 0; /* 802.1d - Best Effort */
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}
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}
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I802_DEBUG_INC(rx->local->wme_rx_queue[tid]);
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/* only a debug counter, sta might not be assigned properly yet */
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if (rx->sta)
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I802_DEBUG_INC(rx->sta->wme_rx_queue[tid]);
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rx->u.rx.queue = tid;
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/* Set skb->priority to 1d tag if highest order bit of TID is not set.
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* For now, set skb->priority to 0 for other cases. */
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rx->skb->priority = (tid > 7) ? 0 : tid;
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return TXRX_CONTINUE;
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}
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static u32 ieee80211_rx_load_stats(struct ieee80211_local *local,
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struct sk_buff *skb,
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struct ieee80211_rx_status *status)
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{
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struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
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u32 load = 0, hdrtime;
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struct ieee80211_rate *rate;
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struct ieee80211_hw_mode *mode = local->hw.conf.mode;
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int i;
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/* Estimate total channel use caused by this frame */
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if (unlikely(mode->num_rates < 0))
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return TXRX_CONTINUE;
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rate = &mode->rates[0];
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for (i = 0; i < mode->num_rates; i++) {
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if (mode->rates[i].val == status->rate) {
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rate = &mode->rates[i];
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break;
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}
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}
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/* 1 bit at 1 Mbit/s takes 1 usec; in channel_use values,
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* 1 usec = 1/8 * (1080 / 10) = 13.5 */
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if (mode->mode == MODE_IEEE80211A ||
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(mode->mode == MODE_IEEE80211G &&
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rate->flags & IEEE80211_RATE_ERP))
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hdrtime = CHAN_UTIL_HDR_SHORT;
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else
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hdrtime = CHAN_UTIL_HDR_LONG;
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load = hdrtime;
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if (!is_multicast_ether_addr(hdr->addr1))
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load += hdrtime;
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load += skb->len * rate->rate_inv;
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/* Divide channel_use by 8 to avoid wrapping around the counter */
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load >>= CHAN_UTIL_SHIFT;
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return load;
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}
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#ifdef CONFIG_MAC80211_DEBUG_PACKET_ALIGNMENT
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static ieee80211_txrx_result
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ieee80211_rx_h_verify_ip_alignment(struct ieee80211_txrx_data *rx)
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{
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int hdrlen;
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if (!WLAN_FC_DATA_PRESENT(rx->fc))
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return TXRX_CONTINUE;
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/*
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* Drivers are required to align the payload data in a way that
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* guarantees that the contained IP header is aligned to a four-
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* byte boundary. In the case of regular frames, this simply means
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* aligning the payload to a four-byte boundary (because either
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* the IP header is directly contained, or IV/RFC1042 headers that
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* have a length divisible by four are in front of it.
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*
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* With A-MSDU frames, however, the payload data address must
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* yield two modulo four because there are 14-byte 802.3 headers
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* within the A-MSDU frames that push the IP header further back
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* to a multiple of four again. Thankfully, the specs were sane
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* enough this time around to require padding each A-MSDU subframe
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* to a length that is a multiple of four.
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*
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* Padding like atheros hardware adds which is inbetween the 802.11
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* header and the payload is not supported, the driver is required
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* to move the 802.11 header further back in that case.
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*/
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hdrlen = ieee80211_get_hdrlen(rx->fc);
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if (rx->flags & IEEE80211_TXRXD_RX_AMSDU)
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hdrlen += ETH_HLEN;
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WARN_ON_ONCE(((unsigned long)(rx->skb->data + hdrlen)) & 3);
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return TXRX_CONTINUE;
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}
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#endif
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ieee80211_rx_handler ieee80211_rx_pre_handlers[] =
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{
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ieee80211_rx_h_parse_qos,
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#ifdef CONFIG_MAC80211_DEBUG_PACKET_ALIGNMENT
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ieee80211_rx_h_verify_ip_alignment,
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#endif
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NULL
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};
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/* rx handlers */
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static ieee80211_txrx_result
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ieee80211_rx_h_if_stats(struct ieee80211_txrx_data *rx)
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{
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if (rx->sta)
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rx->sta->channel_use_raw += rx->u.rx.load;
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rx->sdata->channel_use_raw += rx->u.rx.load;
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return TXRX_CONTINUE;
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}
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static ieee80211_txrx_result
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ieee80211_rx_h_passive_scan(struct ieee80211_txrx_data *rx)
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{
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struct ieee80211_local *local = rx->local;
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struct sk_buff *skb = rx->skb;
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if (unlikely(local->sta_hw_scanning))
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return ieee80211_sta_rx_scan(rx->dev, skb, rx->u.rx.status);
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if (unlikely(local->sta_sw_scanning)) {
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/* drop all the other packets during a software scan anyway */
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if (ieee80211_sta_rx_scan(rx->dev, skb, rx->u.rx.status)
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!= TXRX_QUEUED)
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dev_kfree_skb(skb);
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return TXRX_QUEUED;
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}
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if (unlikely(rx->flags & IEEE80211_TXRXD_RXIN_SCAN)) {
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/* scanning finished during invoking of handlers */
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I802_DEBUG_INC(local->rx_handlers_drop_passive_scan);
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return TXRX_DROP;
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}
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return TXRX_CONTINUE;
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}
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static ieee80211_txrx_result
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ieee80211_rx_h_check(struct ieee80211_txrx_data *rx)
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{
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struct ieee80211_hdr *hdr;
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hdr = (struct ieee80211_hdr *) rx->skb->data;
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/* Drop duplicate 802.11 retransmissions (IEEE 802.11 Chap. 9.2.9) */
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if (rx->sta && !is_multicast_ether_addr(hdr->addr1)) {
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if (unlikely(rx->fc & IEEE80211_FCTL_RETRY &&
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rx->sta->last_seq_ctrl[rx->u.rx.queue] ==
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hdr->seq_ctrl)) {
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if (rx->flags & IEEE80211_TXRXD_RXRA_MATCH) {
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rx->local->dot11FrameDuplicateCount++;
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rx->sta->num_duplicates++;
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}
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return TXRX_DROP;
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} else
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rx->sta->last_seq_ctrl[rx->u.rx.queue] = hdr->seq_ctrl;
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}
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if (unlikely(rx->skb->len < 16)) {
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I802_DEBUG_INC(rx->local->rx_handlers_drop_short);
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return TXRX_DROP;
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}
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|
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/* Drop disallowed frame classes based on STA auth/assoc state;
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* IEEE 802.11, Chap 5.5.
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*
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* 80211.o does filtering only based on association state, i.e., it
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* drops Class 3 frames from not associated stations. hostapd sends
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* deauth/disassoc frames when needed. In addition, hostapd is
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* responsible for filtering on both auth and assoc states.
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*/
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if (unlikely(((rx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_DATA ||
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((rx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_CTL &&
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(rx->fc & IEEE80211_FCTL_STYPE) == IEEE80211_STYPE_PSPOLL)) &&
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rx->sdata->vif.type != IEEE80211_IF_TYPE_IBSS &&
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(!rx->sta || !(rx->sta->flags & WLAN_STA_ASSOC)))) {
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if ((!(rx->fc & IEEE80211_FCTL_FROMDS) &&
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!(rx->fc & IEEE80211_FCTL_TODS) &&
|
|
(rx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_DATA)
|
|
|| !(rx->flags & IEEE80211_TXRXD_RXRA_MATCH)) {
|
|
/* Drop IBSS frames and frames for other hosts
|
|
* silently. */
|
|
return TXRX_DROP;
|
|
}
|
|
|
|
return TXRX_DROP;
|
|
}
|
|
|
|
return TXRX_CONTINUE;
|
|
}
|
|
|
|
|
|
static ieee80211_txrx_result
|
|
ieee80211_rx_h_decrypt(struct ieee80211_txrx_data *rx)
|
|
{
|
|
struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) rx->skb->data;
|
|
int keyidx;
|
|
int hdrlen;
|
|
ieee80211_txrx_result result = TXRX_DROP;
|
|
struct ieee80211_key *stakey = NULL;
|
|
|
|
/*
|
|
* Key selection 101
|
|
*
|
|
* There are three types of keys:
|
|
* - GTK (group keys)
|
|
* - 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. Unless, of
|
|
* course, actual WEP keys ("pre-RSNA") are used, then unicast
|
|
* frames can also use key indizes 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.
|
|
*/
|
|
|
|
if (!(rx->fc & IEEE80211_FCTL_PROTECTED))
|
|
return TXRX_CONTINUE;
|
|
|
|
/*
|
|
* No point in finding a key and decrypting if the frame is neither
|
|
* addressed to us nor a multicast frame.
|
|
*/
|
|
if (!(rx->flags & IEEE80211_TXRXD_RXRA_MATCH))
|
|
return TXRX_CONTINUE;
|
|
|
|
if (rx->sta)
|
|
stakey = rcu_dereference(rx->sta->key);
|
|
|
|
if (!is_multicast_ether_addr(hdr->addr1) && stakey) {
|
|
rx->key = stakey;
|
|
} else {
|
|
/*
|
|
* 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 ((rx->u.rx.status->flag & RX_FLAG_DECRYPTED) &&
|
|
(rx->u.rx.status->flag & RX_FLAG_IV_STRIPPED))
|
|
return TXRX_CONTINUE;
|
|
|
|
hdrlen = ieee80211_get_hdrlen(rx->fc);
|
|
|
|
if (rx->skb->len < 8 + hdrlen)
|
|
return TXRX_DROP; /* TODO: count this? */
|
|
|
|
/*
|
|
* no need to call ieee80211_wep_get_keyidx,
|
|
* it verifies a bunch of things we've done already
|
|
*/
|
|
keyidx = rx->skb->data[hdrlen + 3] >> 6;
|
|
|
|
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.alg != ALG_WEP &&
|
|
!is_multicast_ether_addr(hdr->addr1))
|
|
rx->key = NULL;
|
|
}
|
|
|
|
if (rx->key) {
|
|
rx->key->tx_rx_count++;
|
|
/* TODO: add threshold stuff again */
|
|
} else {
|
|
#ifdef CONFIG_MAC80211_DEBUG
|
|
if (net_ratelimit())
|
|
printk(KERN_DEBUG "%s: RX protected frame,"
|
|
" but have no key\n", rx->dev->name);
|
|
#endif /* CONFIG_MAC80211_DEBUG */
|
|
return TXRX_DROP;
|
|
}
|
|
|
|
/* Check for weak IVs if possible */
|
|
if (rx->sta && rx->key->conf.alg == ALG_WEP &&
|
|
((rx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_DATA) &&
|
|
(!(rx->u.rx.status->flag & RX_FLAG_IV_STRIPPED) ||
|
|
!(rx->u.rx.status->flag & RX_FLAG_DECRYPTED)) &&
|
|
ieee80211_wep_is_weak_iv(rx->skb, rx->key))
|
|
rx->sta->wep_weak_iv_count++;
|
|
|
|
switch (rx->key->conf.alg) {
|
|
case ALG_WEP:
|
|
result = ieee80211_crypto_wep_decrypt(rx);
|
|
break;
|
|
case ALG_TKIP:
|
|
result = ieee80211_crypto_tkip_decrypt(rx);
|
|
break;
|
|
case ALG_CCMP:
|
|
result = ieee80211_crypto_ccmp_decrypt(rx);
|
|
break;
|
|
}
|
|
|
|
/* either the frame has been decrypted or will be dropped */
|
|
rx->u.rx.status->flag |= RX_FLAG_DECRYPTED;
|
|
|
|
return result;
|
|
}
|
|
|
|
static void ap_sta_ps_start(struct net_device *dev, struct sta_info *sta)
|
|
{
|
|
struct ieee80211_sub_if_data *sdata;
|
|
DECLARE_MAC_BUF(mac);
|
|
|
|
sdata = IEEE80211_DEV_TO_SUB_IF(sta->dev);
|
|
|
|
if (sdata->bss)
|
|
atomic_inc(&sdata->bss->num_sta_ps);
|
|
sta->flags |= WLAN_STA_PS;
|
|
sta->pspoll = 0;
|
|
#ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
|
|
printk(KERN_DEBUG "%s: STA %s aid %d enters power save mode\n",
|
|
dev->name, print_mac(mac, sta->addr), sta->aid);
|
|
#endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
|
|
}
|
|
|
|
static int ap_sta_ps_end(struct net_device *dev, struct sta_info *sta)
|
|
{
|
|
struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
|
|
struct sk_buff *skb;
|
|
int sent = 0;
|
|
struct ieee80211_sub_if_data *sdata;
|
|
struct ieee80211_tx_packet_data *pkt_data;
|
|
DECLARE_MAC_BUF(mac);
|
|
|
|
sdata = IEEE80211_DEV_TO_SUB_IF(sta->dev);
|
|
if (sdata->bss)
|
|
atomic_dec(&sdata->bss->num_sta_ps);
|
|
sta->flags &= ~(WLAN_STA_PS | WLAN_STA_TIM);
|
|
sta->pspoll = 0;
|
|
if (!skb_queue_empty(&sta->ps_tx_buf)) {
|
|
if (local->ops->set_tim)
|
|
local->ops->set_tim(local_to_hw(local), sta->aid, 0);
|
|
if (sdata->bss)
|
|
bss_tim_clear(local, sdata->bss, sta->aid);
|
|
}
|
|
#ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
|
|
printk(KERN_DEBUG "%s: STA %s aid %d exits power save mode\n",
|
|
dev->name, print_mac(mac, sta->addr), sta->aid);
|
|
#endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
|
|
/* Send all buffered frames to the station */
|
|
while ((skb = skb_dequeue(&sta->tx_filtered)) != NULL) {
|
|
pkt_data = (struct ieee80211_tx_packet_data *) skb->cb;
|
|
sent++;
|
|
pkt_data->flags |= IEEE80211_TXPD_REQUEUE;
|
|
dev_queue_xmit(skb);
|
|
}
|
|
while ((skb = skb_dequeue(&sta->ps_tx_buf)) != NULL) {
|
|
pkt_data = (struct ieee80211_tx_packet_data *) skb->cb;
|
|
local->total_ps_buffered--;
|
|
sent++;
|
|
#ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
|
|
printk(KERN_DEBUG "%s: STA %s aid %d send PS frame "
|
|
"since STA not sleeping anymore\n", dev->name,
|
|
print_mac(mac, sta->addr), sta->aid);
|
|
#endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
|
|
pkt_data->flags |= IEEE80211_TXPD_REQUEUE;
|
|
dev_queue_xmit(skb);
|
|
}
|
|
|
|
return sent;
|
|
}
|
|
|
|
static ieee80211_txrx_result
|
|
ieee80211_rx_h_sta_process(struct ieee80211_txrx_data *rx)
|
|
{
|
|
struct sta_info *sta = rx->sta;
|
|
struct net_device *dev = rx->dev;
|
|
struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) rx->skb->data;
|
|
|
|
if (!sta)
|
|
return TXRX_CONTINUE;
|
|
|
|
/* Update last_rx only for IBSS packets which are for the current
|
|
* BSSID to avoid keeping the current IBSS network alive in cases where
|
|
* other STAs are using different BSSID. */
|
|
if (rx->sdata->vif.type == IEEE80211_IF_TYPE_IBSS) {
|
|
u8 *bssid = ieee80211_get_bssid(hdr, rx->skb->len,
|
|
IEEE80211_IF_TYPE_IBSS);
|
|
if (compare_ether_addr(bssid, rx->sdata->u.sta.bssid) == 0)
|
|
sta->last_rx = jiffies;
|
|
} else
|
|
if (!is_multicast_ether_addr(hdr->addr1) ||
|
|
rx->sdata->vif.type == IEEE80211_IF_TYPE_STA) {
|
|
/* Update last_rx only for unicast frames in order to prevent
|
|
* the Probe Request frames (the only broadcast frames from a
|
|
* STA in infrastructure mode) from keeping a connection alive.
|
|
*/
|
|
sta->last_rx = jiffies;
|
|
}
|
|
|
|
if (!(rx->flags & IEEE80211_TXRXD_RXRA_MATCH))
|
|
return TXRX_CONTINUE;
|
|
|
|
sta->rx_fragments++;
|
|
sta->rx_bytes += rx->skb->len;
|
|
sta->last_rssi = rx->u.rx.status->ssi;
|
|
sta->last_signal = rx->u.rx.status->signal;
|
|
sta->last_noise = rx->u.rx.status->noise;
|
|
|
|
if (!(rx->fc & IEEE80211_FCTL_MOREFRAGS)) {
|
|
/* Change STA power saving mode only in the end of a frame
|
|
* exchange sequence */
|
|
if ((sta->flags & WLAN_STA_PS) && !(rx->fc & IEEE80211_FCTL_PM))
|
|
rx->u.rx.sent_ps_buffered += ap_sta_ps_end(dev, sta);
|
|
else if (!(sta->flags & WLAN_STA_PS) &&
|
|
(rx->fc & IEEE80211_FCTL_PM))
|
|
ap_sta_ps_start(dev, sta);
|
|
}
|
|
|
|
/* Drop data::nullfunc frames silently, since they are used only to
|
|
* control station power saving mode. */
|
|
if ((rx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_DATA &&
|
|
(rx->fc & IEEE80211_FCTL_STYPE) == IEEE80211_STYPE_NULLFUNC) {
|
|
I802_DEBUG_INC(rx->local->rx_handlers_drop_nullfunc);
|
|
/* Update counter and free packet here to avoid counting this
|
|
* as a dropped packed. */
|
|
sta->rx_packets++;
|
|
dev_kfree_skb(rx->skb);
|
|
return TXRX_QUEUED;
|
|
}
|
|
|
|
return TXRX_CONTINUE;
|
|
} /* ieee80211_rx_h_sta_process */
|
|
|
|
static inline struct ieee80211_fragment_entry *
|
|
ieee80211_reassemble_add(struct ieee80211_sub_if_data *sdata,
|
|
unsigned int frag, unsigned int seq, int rx_queue,
|
|
struct sk_buff **skb)
|
|
{
|
|
struct ieee80211_fragment_entry *entry;
|
|
int idx;
|
|
|
|
idx = sdata->fragment_next;
|
|
entry = &sdata->fragments[sdata->fragment_next++];
|
|
if (sdata->fragment_next >= IEEE80211_FRAGMENT_MAX)
|
|
sdata->fragment_next = 0;
|
|
|
|
if (!skb_queue_empty(&entry->skb_list)) {
|
|
#ifdef CONFIG_MAC80211_DEBUG
|
|
struct ieee80211_hdr *hdr =
|
|
(struct ieee80211_hdr *) entry->skb_list.next->data;
|
|
DECLARE_MAC_BUF(mac);
|
|
DECLARE_MAC_BUF(mac2);
|
|
printk(KERN_DEBUG "%s: RX reassembly removed oldest "
|
|
"fragment entry (idx=%d age=%lu seq=%d last_frag=%d "
|
|
"addr1=%s addr2=%s\n",
|
|
sdata->dev->name, idx,
|
|
jiffies - entry->first_frag_time, entry->seq,
|
|
entry->last_frag, print_mac(mac, hdr->addr1),
|
|
print_mac(mac2, hdr->addr2));
|
|
#endif /* CONFIG_MAC80211_DEBUG */
|
|
__skb_queue_purge(&entry->skb_list);
|
|
}
|
|
|
|
__skb_queue_tail(&entry->skb_list, *skb); /* no need for locking */
|
|
*skb = NULL;
|
|
entry->first_frag_time = jiffies;
|
|
entry->seq = seq;
|
|
entry->rx_queue = rx_queue;
|
|
entry->last_frag = frag;
|
|
entry->ccmp = 0;
|
|
entry->extra_len = 0;
|
|
|
|
return entry;
|
|
}
|
|
|
|
static inline struct ieee80211_fragment_entry *
|
|
ieee80211_reassemble_find(struct ieee80211_sub_if_data *sdata,
|
|
u16 fc, 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;
|
|
u16 f_fc;
|
|
|
|
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;
|
|
f_fc = le16_to_cpu(f_hdr->frame_control);
|
|
|
|
if ((fc & IEEE80211_FCTL_FTYPE) != (f_fc & IEEE80211_FCTL_FTYPE) ||
|
|
compare_ether_addr(hdr->addr1, f_hdr->addr1) != 0 ||
|
|
compare_ether_addr(hdr->addr2, f_hdr->addr2) != 0)
|
|
continue;
|
|
|
|
if (entry->first_frag_time + 2 * HZ < jiffies) {
|
|
__skb_queue_purge(&entry->skb_list);
|
|
continue;
|
|
}
|
|
return entry;
|
|
}
|
|
|
|
return NULL;
|
|
}
|
|
|
|
static ieee80211_txrx_result
|
|
ieee80211_rx_h_defragment(struct ieee80211_txrx_data *rx)
|
|
{
|
|
struct ieee80211_hdr *hdr;
|
|
u16 sc;
|
|
unsigned int frag, seq;
|
|
struct ieee80211_fragment_entry *entry;
|
|
struct sk_buff *skb;
|
|
DECLARE_MAC_BUF(mac);
|
|
|
|
hdr = (struct ieee80211_hdr *) rx->skb->data;
|
|
sc = le16_to_cpu(hdr->seq_ctrl);
|
|
frag = sc & IEEE80211_SCTL_FRAG;
|
|
|
|
if (likely((!(rx->fc & IEEE80211_FCTL_MOREFRAGS) && frag == 0) ||
|
|
(rx->skb)->len < 24 ||
|
|
is_multicast_ether_addr(hdr->addr1))) {
|
|
/* not fragmented */
|
|
goto out;
|
|
}
|
|
I802_DEBUG_INC(rx->local->rx_handlers_fragments);
|
|
|
|
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->u.rx.queue, &(rx->skb));
|
|
if (rx->key && rx->key->conf.alg == ALG_CCMP &&
|
|
(rx->fc & IEEE80211_FCTL_PROTECTED)) {
|
|
/* Store CCMP PN so that we can verify that the next
|
|
* fragment has a sequential PN value. */
|
|
entry->ccmp = 1;
|
|
memcpy(entry->last_pn,
|
|
rx->key->u.ccmp.rx_pn[rx->u.rx.queue],
|
|
CCMP_PN_LEN);
|
|
}
|
|
return TXRX_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, rx->fc, frag, seq,
|
|
rx->u.rx.queue, hdr);
|
|
if (!entry) {
|
|
I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag);
|
|
return TXRX_DROP;
|
|
}
|
|
|
|
/* Verify that MPDUs within one MSDU have sequential PN values.
|
|
* (IEEE 802.11i, 8.3.3.4.5) */
|
|
if (entry->ccmp) {
|
|
int i;
|
|
u8 pn[CCMP_PN_LEN], *rpn;
|
|
if (!rx->key || rx->key->conf.alg != ALG_CCMP)
|
|
return TXRX_DROP;
|
|
memcpy(pn, entry->last_pn, CCMP_PN_LEN);
|
|
for (i = CCMP_PN_LEN - 1; i >= 0; i--) {
|
|
pn[i]++;
|
|
if (pn[i])
|
|
break;
|
|
}
|
|
rpn = rx->key->u.ccmp.rx_pn[rx->u.rx.queue];
|
|
if (memcmp(pn, rpn, CCMP_PN_LEN) != 0) {
|
|
if (net_ratelimit())
|
|
printk(KERN_DEBUG "%s: defrag: CCMP PN not "
|
|
"sequential A2=%s"
|
|
" PN=%02x%02x%02x%02x%02x%02x "
|
|
"(expected %02x%02x%02x%02x%02x%02x)\n",
|
|
rx->dev->name, print_mac(mac, hdr->addr2),
|
|
rpn[0], rpn[1], rpn[2], rpn[3], rpn[4],
|
|
rpn[5], pn[0], pn[1], pn[2], pn[3],
|
|
pn[4], pn[5]);
|
|
return TXRX_DROP;
|
|
}
|
|
memcpy(entry->last_pn, pn, CCMP_PN_LEN);
|
|
}
|
|
|
|
skb_pull(rx->skb, ieee80211_get_hdrlen(rx->fc));
|
|
__skb_queue_tail(&entry->skb_list, rx->skb);
|
|
entry->last_frag = frag;
|
|
entry->extra_len += rx->skb->len;
|
|
if (rx->fc & IEEE80211_FCTL_MOREFRAGS) {
|
|
rx->skb = NULL;
|
|
return TXRX_QUEUED;
|
|
}
|
|
|
|
rx->skb = __skb_dequeue(&entry->skb_list);
|
|
if (skb_tailroom(rx->skb) < entry->extra_len) {
|
|
I802_DEBUG_INC(rx->local->rx_expand_skb_head2);
|
|
if (unlikely(pskb_expand_head(rx->skb, 0, entry->extra_len,
|
|
GFP_ATOMIC))) {
|
|
I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag);
|
|
__skb_queue_purge(&entry->skb_list);
|
|
return TXRX_DROP;
|
|
}
|
|
}
|
|
while ((skb = __skb_dequeue(&entry->skb_list))) {
|
|
memcpy(skb_put(rx->skb, skb->len), skb->data, skb->len);
|
|
dev_kfree_skb(skb);
|
|
}
|
|
|
|
/* Complete frame has been reassembled - process it now */
|
|
rx->flags |= IEEE80211_TXRXD_FRAGMENTED;
|
|
|
|
out:
|
|
if (rx->sta)
|
|
rx->sta->rx_packets++;
|
|
if (is_multicast_ether_addr(hdr->addr1))
|
|
rx->local->dot11MulticastReceivedFrameCount++;
|
|
else
|
|
ieee80211_led_rx(rx->local);
|
|
return TXRX_CONTINUE;
|
|
}
|
|
|
|
static ieee80211_txrx_result
|
|
ieee80211_rx_h_ps_poll(struct ieee80211_txrx_data *rx)
|
|
{
|
|
struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(rx->dev);
|
|
struct sk_buff *skb;
|
|
int no_pending_pkts;
|
|
DECLARE_MAC_BUF(mac);
|
|
|
|
if (likely(!rx->sta ||
|
|
(rx->fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_CTL ||
|
|
(rx->fc & IEEE80211_FCTL_STYPE) != IEEE80211_STYPE_PSPOLL ||
|
|
!(rx->flags & IEEE80211_TXRXD_RXRA_MATCH)))
|
|
return TXRX_CONTINUE;
|
|
|
|
if ((sdata->vif.type != IEEE80211_IF_TYPE_AP) &&
|
|
(sdata->vif.type != IEEE80211_IF_TYPE_VLAN))
|
|
return TXRX_DROP;
|
|
|
|
skb = skb_dequeue(&rx->sta->tx_filtered);
|
|
if (!skb) {
|
|
skb = skb_dequeue(&rx->sta->ps_tx_buf);
|
|
if (skb)
|
|
rx->local->total_ps_buffered--;
|
|
}
|
|
no_pending_pkts = skb_queue_empty(&rx->sta->tx_filtered) &&
|
|
skb_queue_empty(&rx->sta->ps_tx_buf);
|
|
|
|
if (skb) {
|
|
struct ieee80211_hdr *hdr =
|
|
(struct ieee80211_hdr *) skb->data;
|
|
|
|
/* tell TX path to send one frame even though the STA may
|
|
* still remain is PS mode after this frame exchange */
|
|
rx->sta->pspoll = 1;
|
|
|
|
#ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
|
|
printk(KERN_DEBUG "STA %s aid %d: PS Poll (entries after %d)\n",
|
|
print_mac(mac, rx->sta->addr), rx->sta->aid,
|
|
skb_queue_len(&rx->sta->ps_tx_buf));
|
|
#endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
|
|
|
|
/* Use MoreData flag to indicate whether there are more
|
|
* buffered frames for this STA */
|
|
if (no_pending_pkts) {
|
|
hdr->frame_control &= cpu_to_le16(~IEEE80211_FCTL_MOREDATA);
|
|
rx->sta->flags &= ~WLAN_STA_TIM;
|
|
} else
|
|
hdr->frame_control |= cpu_to_le16(IEEE80211_FCTL_MOREDATA);
|
|
|
|
dev_queue_xmit(skb);
|
|
|
|
if (no_pending_pkts) {
|
|
if (rx->local->ops->set_tim)
|
|
rx->local->ops->set_tim(local_to_hw(rx->local),
|
|
rx->sta->aid, 0);
|
|
if (rx->sdata->bss)
|
|
bss_tim_clear(rx->local, rx->sdata->bss, rx->sta->aid);
|
|
}
|
|
#ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
|
|
} else if (!rx->u.rx.sent_ps_buffered) {
|
|
printk(KERN_DEBUG "%s: STA %s sent PS Poll even "
|
|
"though there is no buffered frames for it\n",
|
|
rx->dev->name, print_mac(mac, rx->sta->addr));
|
|
#endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
|
|
|
|
}
|
|
|
|
/* Free PS Poll skb here instead of returning TXRX_DROP that would
|
|
* count as an dropped frame. */
|
|
dev_kfree_skb(rx->skb);
|
|
|
|
return TXRX_QUEUED;
|
|
}
|
|
|
|
static ieee80211_txrx_result
|
|
ieee80211_rx_h_remove_qos_control(struct ieee80211_txrx_data *rx)
|
|
{
|
|
u16 fc = rx->fc;
|
|
u8 *data = rx->skb->data;
|
|
struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) data;
|
|
|
|
if (!WLAN_FC_IS_QOS_DATA(fc))
|
|
return TXRX_CONTINUE;
|
|
|
|
/* remove the qos control field, update frame type and meta-data */
|
|
memmove(data + 2, data, ieee80211_get_hdrlen(fc) - 2);
|
|
hdr = (struct ieee80211_hdr *) skb_pull(rx->skb, 2);
|
|
/* change frame type to non QOS */
|
|
rx->fc = fc &= ~IEEE80211_STYPE_QOS_DATA;
|
|
hdr->frame_control = cpu_to_le16(fc);
|
|
|
|
return TXRX_CONTINUE;
|
|
}
|
|
|
|
static int
|
|
ieee80211_802_1x_port_control(struct ieee80211_txrx_data *rx)
|
|
{
|
|
if (unlikely(rx->sdata->ieee802_1x_pac &&
|
|
(!rx->sta || !(rx->sta->flags & WLAN_STA_AUTHORIZED)))) {
|
|
#ifdef CONFIG_MAC80211_DEBUG
|
|
printk(KERN_DEBUG "%s: dropped frame "
|
|
"(unauthorized port)\n", rx->dev->name);
|
|
#endif /* CONFIG_MAC80211_DEBUG */
|
|
return -EACCES;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int
|
|
ieee80211_drop_unencrypted(struct ieee80211_txrx_data *rx)
|
|
{
|
|
/*
|
|
* Pass through unencrypted frames if the hardware has
|
|
* decrypted them already.
|
|
*/
|
|
if (rx->u.rx.status->flag & RX_FLAG_DECRYPTED)
|
|
return 0;
|
|
|
|
/* Drop unencrypted frames if key is set. */
|
|
if (unlikely(!(rx->fc & IEEE80211_FCTL_PROTECTED) &&
|
|
(rx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_DATA &&
|
|
(rx->fc & IEEE80211_FCTL_STYPE) != IEEE80211_STYPE_NULLFUNC &&
|
|
(rx->key || rx->sdata->drop_unencrypted))) {
|
|
if (net_ratelimit())
|
|
printk(KERN_DEBUG "%s: RX non-WEP frame, but expected "
|
|
"encryption\n", rx->dev->name);
|
|
return -EACCES;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static int
|
|
ieee80211_data_to_8023(struct ieee80211_txrx_data *rx)
|
|
{
|
|
struct net_device *dev = rx->dev;
|
|
struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) rx->skb->data;
|
|
u16 fc, hdrlen, ethertype;
|
|
u8 *payload;
|
|
u8 dst[ETH_ALEN];
|
|
u8 src[ETH_ALEN];
|
|
struct sk_buff *skb = rx->skb;
|
|
struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
|
|
DECLARE_MAC_BUF(mac);
|
|
DECLARE_MAC_BUF(mac2);
|
|
DECLARE_MAC_BUF(mac3);
|
|
DECLARE_MAC_BUF(mac4);
|
|
|
|
fc = rx->fc;
|
|
|
|
if (unlikely(!WLAN_FC_DATA_PRESENT(fc)))
|
|
return -1;
|
|
|
|
hdrlen = ieee80211_get_hdrlen(fc);
|
|
|
|
/* convert IEEE 802.11 header + possible LLC headers into Ethernet
|
|
* header
|
|
* IEEE 802.11 address fields:
|
|
* ToDS FromDS Addr1 Addr2 Addr3 Addr4
|
|
* 0 0 DA SA BSSID n/a
|
|
* 0 1 DA BSSID SA n/a
|
|
* 1 0 BSSID SA DA n/a
|
|
* 1 1 RA TA DA SA
|
|
*/
|
|
|
|
switch (fc & (IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS)) {
|
|
case IEEE80211_FCTL_TODS:
|
|
/* BSSID SA DA */
|
|
memcpy(dst, hdr->addr3, ETH_ALEN);
|
|
memcpy(src, hdr->addr2, ETH_ALEN);
|
|
|
|
if (unlikely(sdata->vif.type != IEEE80211_IF_TYPE_AP &&
|
|
sdata->vif.type != IEEE80211_IF_TYPE_VLAN)) {
|
|
if (net_ratelimit())
|
|
printk(KERN_DEBUG "%s: dropped ToDS frame "
|
|
"(BSSID=%s SA=%s DA=%s)\n",
|
|
dev->name,
|
|
print_mac(mac, hdr->addr1),
|
|
print_mac(mac2, hdr->addr2),
|
|
print_mac(mac3, hdr->addr3));
|
|
return -1;
|
|
}
|
|
break;
|
|
case (IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS):
|
|
/* RA TA DA SA */
|
|
memcpy(dst, hdr->addr3, ETH_ALEN);
|
|
memcpy(src, hdr->addr4, ETH_ALEN);
|
|
|
|
if (unlikely(sdata->vif.type != IEEE80211_IF_TYPE_WDS)) {
|
|
if (net_ratelimit())
|
|
printk(KERN_DEBUG "%s: dropped FromDS&ToDS "
|
|
"frame (RA=%s TA=%s DA=%s SA=%s)\n",
|
|
rx->dev->name,
|
|
print_mac(mac, hdr->addr1),
|
|
print_mac(mac2, hdr->addr2),
|
|
print_mac(mac3, hdr->addr3),
|
|
print_mac(mac4, hdr->addr4));
|
|
return -1;
|
|
}
|
|
break;
|
|
case IEEE80211_FCTL_FROMDS:
|
|
/* DA BSSID SA */
|
|
memcpy(dst, hdr->addr1, ETH_ALEN);
|
|
memcpy(src, hdr->addr3, ETH_ALEN);
|
|
|
|
if (sdata->vif.type != IEEE80211_IF_TYPE_STA ||
|
|
(is_multicast_ether_addr(dst) &&
|
|
!compare_ether_addr(src, dev->dev_addr)))
|
|
return -1;
|
|
break;
|
|
case 0:
|
|
/* DA SA BSSID */
|
|
memcpy(dst, hdr->addr1, ETH_ALEN);
|
|
memcpy(src, hdr->addr2, ETH_ALEN);
|
|
|
|
if (sdata->vif.type != IEEE80211_IF_TYPE_IBSS) {
|
|
if (net_ratelimit()) {
|
|
printk(KERN_DEBUG "%s: dropped IBSS frame "
|
|
"(DA=%s SA=%s BSSID=%s)\n",
|
|
dev->name,
|
|
print_mac(mac, hdr->addr1),
|
|
print_mac(mac2, hdr->addr2),
|
|
print_mac(mac3, hdr->addr3));
|
|
}
|
|
return -1;
|
|
}
|
|
break;
|
|
}
|
|
|
|
if (unlikely(skb->len - hdrlen < 8)) {
|
|
if (net_ratelimit()) {
|
|
printk(KERN_DEBUG "%s: RX too short data frame "
|
|
"payload\n", dev->name);
|
|
}
|
|
return -1;
|
|
}
|
|
|
|
payload = skb->data + hdrlen;
|
|
ethertype = (payload[6] << 8) | payload[7];
|
|
|
|
if (likely((compare_ether_addr(payload, rfc1042_header) == 0 &&
|
|
ethertype != ETH_P_AARP && ethertype != ETH_P_IPX) ||
|
|
compare_ether_addr(payload, bridge_tunnel_header) == 0)) {
|
|
/* remove RFC1042 or Bridge-Tunnel encapsulation and
|
|
* replace EtherType */
|
|
skb_pull(skb, hdrlen + 6);
|
|
memcpy(skb_push(skb, ETH_ALEN), src, ETH_ALEN);
|
|
memcpy(skb_push(skb, ETH_ALEN), dst, ETH_ALEN);
|
|
} else {
|
|
struct ethhdr *ehdr;
|
|
__be16 len;
|
|
|
|
skb_pull(skb, hdrlen);
|
|
len = htons(skb->len);
|
|
ehdr = (struct ethhdr *) skb_push(skb, sizeof(struct ethhdr));
|
|
memcpy(ehdr->h_dest, dst, ETH_ALEN);
|
|
memcpy(ehdr->h_source, src, ETH_ALEN);
|
|
ehdr->h_proto = len;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* requires that rx->skb is a frame with ethernet header
|
|
*/
|
|
static bool ieee80211_frame_allowed(struct ieee80211_txrx_data *rx)
|
|
{
|
|
static const u8 pae_group_addr[ETH_ALEN]
|
|
= { 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 == htons(ETH_P_PAE) &&
|
|
(compare_ether_addr(ehdr->h_dest, rx->dev->dev_addr) == 0 ||
|
|
compare_ether_addr(ehdr->h_dest, pae_group_addr) == 0))
|
|
return true;
|
|
|
|
if (ieee80211_802_1x_port_control(rx) ||
|
|
ieee80211_drop_unencrypted(rx))
|
|
return false;
|
|
|
|
return true;
|
|
}
|
|
|
|
/*
|
|
* requires that rx->skb is a frame with ethernet header
|
|
*/
|
|
static void
|
|
ieee80211_deliver_skb(struct ieee80211_txrx_data *rx)
|
|
{
|
|
struct net_device *dev = rx->dev;
|
|
struct ieee80211_local *local = rx->local;
|
|
struct sk_buff *skb, *xmit_skb;
|
|
struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
|
|
struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data;
|
|
struct sta_info *dsta;
|
|
|
|
skb = rx->skb;
|
|
xmit_skb = NULL;
|
|
|
|
if (local->bridge_packets && (sdata->vif.type == IEEE80211_IF_TYPE_AP ||
|
|
sdata->vif.type == IEEE80211_IF_TYPE_VLAN) &&
|
|
(rx->flags & IEEE80211_TXRXD_RXRA_MATCH)) {
|
|
if (is_multicast_ether_addr(ehdr->h_dest)) {
|
|
/*
|
|
* send multicast frames both to higher layers in
|
|
* local net stack and back to the wireless medium
|
|
*/
|
|
xmit_skb = skb_copy(skb, GFP_ATOMIC);
|
|
if (!xmit_skb && net_ratelimit())
|
|
printk(KERN_DEBUG "%s: failed to clone "
|
|
"multicast frame\n", dev->name);
|
|
} else {
|
|
dsta = sta_info_get(local, skb->data);
|
|
if (dsta && dsta->dev == dev) {
|
|
/*
|
|
* The destination station is associated to
|
|
* this AP (in this VLAN), so send the frame
|
|
* directly to it and do not pass it to local
|
|
* net stack.
|
|
*/
|
|
xmit_skb = skb;
|
|
skb = NULL;
|
|
}
|
|
if (dsta)
|
|
sta_info_put(dsta);
|
|
}
|
|
}
|
|
|
|
if (skb) {
|
|
/* deliver to local stack */
|
|
skb->protocol = eth_type_trans(skb, dev);
|
|
memset(skb->cb, 0, sizeof(skb->cb));
|
|
netif_rx(skb);
|
|
}
|
|
|
|
if (xmit_skb) {
|
|
/* send to wireless media */
|
|
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_txrx_result
|
|
ieee80211_rx_h_amsdu(struct ieee80211_txrx_data *rx)
|
|
{
|
|
struct net_device *dev = rx->dev;
|
|
struct ieee80211_local *local = rx->local;
|
|
u16 fc, ethertype;
|
|
u8 *payload;
|
|
struct sk_buff *skb = rx->skb, *frame = NULL;
|
|
const struct ethhdr *eth;
|
|
int remaining, err;
|
|
u8 dst[ETH_ALEN];
|
|
u8 src[ETH_ALEN];
|
|
DECLARE_MAC_BUF(mac);
|
|
|
|
fc = rx->fc;
|
|
if (unlikely((fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_DATA))
|
|
return TXRX_CONTINUE;
|
|
|
|
if (unlikely(!WLAN_FC_DATA_PRESENT(fc)))
|
|
return TXRX_DROP;
|
|
|
|
if (!(rx->flags & IEEE80211_TXRXD_RX_AMSDU))
|
|
return TXRX_CONTINUE;
|
|
|
|
err = ieee80211_data_to_8023(rx);
|
|
if (unlikely(err))
|
|
return TXRX_DROP;
|
|
|
|
skb->dev = dev;
|
|
|
|
dev->stats.rx_packets++;
|
|
dev->stats.rx_bytes += skb->len;
|
|
|
|
/* skip the wrapping header */
|
|
eth = (struct ethhdr *) skb_pull(skb, sizeof(struct ethhdr));
|
|
if (!eth)
|
|
return TXRX_DROP;
|
|
|
|
while (skb != frame) {
|
|
u8 padding;
|
|
__be16 len = eth->h_proto;
|
|
unsigned int subframe_len = sizeof(struct ethhdr) + ntohs(len);
|
|
|
|
remaining = skb->len;
|
|
memcpy(dst, eth->h_dest, ETH_ALEN);
|
|
memcpy(src, eth->h_source, ETH_ALEN);
|
|
|
|
padding = ((4 - subframe_len) & 0x3);
|
|
/* the last MSDU has no padding */
|
|
if (subframe_len > remaining) {
|
|
printk(KERN_DEBUG "%s: wrong buffer size", dev->name);
|
|
return TXRX_DROP;
|
|
}
|
|
|
|
skb_pull(skb, sizeof(struct ethhdr));
|
|
/* if last subframe reuse skb */
|
|
if (remaining <= subframe_len + padding)
|
|
frame = skb;
|
|
else {
|
|
frame = dev_alloc_skb(local->hw.extra_tx_headroom +
|
|
subframe_len);
|
|
|
|
if (frame == NULL)
|
|
return TXRX_DROP;
|
|
|
|
skb_reserve(frame, local->hw.extra_tx_headroom +
|
|
sizeof(struct ethhdr));
|
|
memcpy(skb_put(frame, ntohs(len)), skb->data,
|
|
ntohs(len));
|
|
|
|
eth = (struct ethhdr *) skb_pull(skb, ntohs(len) +
|
|
padding);
|
|
if (!eth) {
|
|
printk(KERN_DEBUG "%s: wrong buffer size ",
|
|
dev->name);
|
|
dev_kfree_skb(frame);
|
|
return TXRX_DROP;
|
|
}
|
|
}
|
|
|
|
skb_reset_network_header(frame);
|
|
frame->dev = dev;
|
|
frame->priority = skb->priority;
|
|
rx->skb = frame;
|
|
|
|
payload = frame->data;
|
|
ethertype = (payload[6] << 8) | payload[7];
|
|
|
|
if (likely((compare_ether_addr(payload, rfc1042_header) == 0 &&
|
|
ethertype != ETH_P_AARP && ethertype != ETH_P_IPX) ||
|
|
compare_ether_addr(payload,
|
|
bridge_tunnel_header) == 0)) {
|
|
/* remove RFC1042 or Bridge-Tunnel
|
|
* encapsulation and replace EtherType */
|
|
skb_pull(frame, 6);
|
|
memcpy(skb_push(frame, ETH_ALEN), src, ETH_ALEN);
|
|
memcpy(skb_push(frame, ETH_ALEN), dst, ETH_ALEN);
|
|
} else {
|
|
memcpy(skb_push(frame, sizeof(__be16)),
|
|
&len, sizeof(__be16));
|
|
memcpy(skb_push(frame, ETH_ALEN), src, ETH_ALEN);
|
|
memcpy(skb_push(frame, ETH_ALEN), dst, ETH_ALEN);
|
|
}
|
|
|
|
if (!ieee80211_frame_allowed(rx)) {
|
|
if (skb == frame) /* last frame */
|
|
return TXRX_DROP;
|
|
dev_kfree_skb(frame);
|
|
continue;
|
|
}
|
|
|
|
ieee80211_deliver_skb(rx);
|
|
}
|
|
|
|
return TXRX_QUEUED;
|
|
}
|
|
|
|
static ieee80211_txrx_result
|
|
ieee80211_rx_h_data(struct ieee80211_txrx_data *rx)
|
|
{
|
|
struct net_device *dev = rx->dev;
|
|
u16 fc;
|
|
int err;
|
|
|
|
fc = rx->fc;
|
|
if (unlikely((fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_DATA))
|
|
return TXRX_CONTINUE;
|
|
|
|
if (unlikely(!WLAN_FC_DATA_PRESENT(fc)))
|
|
return TXRX_DROP;
|
|
|
|
err = ieee80211_data_to_8023(rx);
|
|
if (unlikely(err))
|
|
return TXRX_DROP;
|
|
|
|
if (!ieee80211_frame_allowed(rx))
|
|
return TXRX_DROP;
|
|
|
|
rx->skb->dev = dev;
|
|
|
|
dev->stats.rx_packets++;
|
|
dev->stats.rx_bytes += rx->skb->len;
|
|
|
|
ieee80211_deliver_skb(rx);
|
|
|
|
return TXRX_QUEUED;
|
|
}
|
|
|
|
static ieee80211_txrx_result
|
|
ieee80211_rx_h_ctrl(struct ieee80211_txrx_data *rx)
|
|
{
|
|
struct ieee80211_local *local = rx->local;
|
|
struct ieee80211_hw *hw = &local->hw;
|
|
struct sk_buff *skb = rx->skb;
|
|
struct ieee80211_bar *bar = (struct ieee80211_bar *) skb->data;
|
|
struct tid_ampdu_rx *tid_agg_rx;
|
|
u16 start_seq_num;
|
|
u16 tid;
|
|
|
|
if (likely((rx->fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_CTL))
|
|
return TXRX_CONTINUE;
|
|
|
|
if ((rx->fc & IEEE80211_FCTL_STYPE) == IEEE80211_STYPE_BACK_REQ) {
|
|
if (!rx->sta)
|
|
return TXRX_CONTINUE;
|
|
tid = le16_to_cpu(bar->control) >> 12;
|
|
tid_agg_rx = &(rx->sta->ampdu_mlme.tid_rx[tid]);
|
|
if (tid_agg_rx->state != HT_AGG_STATE_OPERATIONAL)
|
|
return TXRX_CONTINUE;
|
|
|
|
start_seq_num = le16_to_cpu(bar->start_seq_num) >> 4;
|
|
|
|
/* reset session timer */
|
|
if (tid_agg_rx->timeout) {
|
|
unsigned long expires =
|
|
jiffies + (tid_agg_rx->timeout / 1000) * HZ;
|
|
mod_timer(&tid_agg_rx->session_timer, expires);
|
|
}
|
|
|
|
/* manage reordering buffer according to requested */
|
|
/* sequence number */
|
|
rcu_read_lock();
|
|
ieee80211_sta_manage_reorder_buf(hw, tid_agg_rx, NULL,
|
|
start_seq_num, 1);
|
|
rcu_read_unlock();
|
|
return TXRX_DROP;
|
|
}
|
|
|
|
return TXRX_CONTINUE;
|
|
}
|
|
|
|
static ieee80211_txrx_result
|
|
ieee80211_rx_h_mgmt(struct ieee80211_txrx_data *rx)
|
|
{
|
|
struct ieee80211_sub_if_data *sdata;
|
|
|
|
if (!(rx->flags & IEEE80211_TXRXD_RXRA_MATCH))
|
|
return TXRX_DROP;
|
|
|
|
sdata = IEEE80211_DEV_TO_SUB_IF(rx->dev);
|
|
if ((sdata->vif.type == IEEE80211_IF_TYPE_STA ||
|
|
sdata->vif.type == IEEE80211_IF_TYPE_IBSS) &&
|
|
!(sdata->flags & IEEE80211_SDATA_USERSPACE_MLME))
|
|
ieee80211_sta_rx_mgmt(rx->dev, rx->skb, rx->u.rx.status);
|
|
else
|
|
return TXRX_DROP;
|
|
|
|
return TXRX_QUEUED;
|
|
}
|
|
|
|
static inline ieee80211_txrx_result __ieee80211_invoke_rx_handlers(
|
|
struct ieee80211_local *local,
|
|
ieee80211_rx_handler *handlers,
|
|
struct ieee80211_txrx_data *rx,
|
|
struct sta_info *sta)
|
|
{
|
|
ieee80211_rx_handler *handler;
|
|
ieee80211_txrx_result res = TXRX_DROP;
|
|
|
|
for (handler = handlers; *handler != NULL; handler++) {
|
|
res = (*handler)(rx);
|
|
|
|
switch (res) {
|
|
case TXRX_CONTINUE:
|
|
continue;
|
|
case TXRX_DROP:
|
|
I802_DEBUG_INC(local->rx_handlers_drop);
|
|
if (sta)
|
|
sta->rx_dropped++;
|
|
break;
|
|
case TXRX_QUEUED:
|
|
I802_DEBUG_INC(local->rx_handlers_queued);
|
|
break;
|
|
}
|
|
break;
|
|
}
|
|
|
|
if (res == TXRX_DROP)
|
|
dev_kfree_skb(rx->skb);
|
|
return res;
|
|
}
|
|
|
|
static inline void ieee80211_invoke_rx_handlers(struct ieee80211_local *local,
|
|
ieee80211_rx_handler *handlers,
|
|
struct ieee80211_txrx_data *rx,
|
|
struct sta_info *sta)
|
|
{
|
|
if (__ieee80211_invoke_rx_handlers(local, handlers, rx, sta) ==
|
|
TXRX_CONTINUE)
|
|
dev_kfree_skb(rx->skb);
|
|
}
|
|
|
|
static void ieee80211_rx_michael_mic_report(struct net_device *dev,
|
|
struct ieee80211_hdr *hdr,
|
|
struct sta_info *sta,
|
|
struct ieee80211_txrx_data *rx)
|
|
{
|
|
int keyidx, hdrlen;
|
|
DECLARE_MAC_BUF(mac);
|
|
DECLARE_MAC_BUF(mac2);
|
|
|
|
hdrlen = ieee80211_get_hdrlen_from_skb(rx->skb);
|
|
if (rx->skb->len >= hdrlen + 4)
|
|
keyidx = rx->skb->data[hdrlen + 3] >> 6;
|
|
else
|
|
keyidx = -1;
|
|
|
|
if (net_ratelimit())
|
|
printk(KERN_DEBUG "%s: TKIP hwaccel reported Michael MIC "
|
|
"failure from %s to %s keyidx=%d\n",
|
|
dev->name, print_mac(mac, hdr->addr2),
|
|
print_mac(mac2, hdr->addr1), keyidx);
|
|
|
|
if (!sta) {
|
|
/*
|
|
* Some hardware seem to generate incorrect Michael MIC
|
|
* reports; ignore them to avoid triggering countermeasures.
|
|
*/
|
|
if (net_ratelimit())
|
|
printk(KERN_DEBUG "%s: ignored spurious Michael MIC "
|
|
"error for unknown address %s\n",
|
|
dev->name, print_mac(mac, hdr->addr2));
|
|
goto ignore;
|
|
}
|
|
|
|
if (!(rx->fc & IEEE80211_FCTL_PROTECTED)) {
|
|
if (net_ratelimit())
|
|
printk(KERN_DEBUG "%s: ignored spurious Michael MIC "
|
|
"error for a frame with no PROTECTED flag (src "
|
|
"%s)\n", dev->name, print_mac(mac, hdr->addr2));
|
|
goto ignore;
|
|
}
|
|
|
|
if (rx->sdata->vif.type == IEEE80211_IF_TYPE_AP && keyidx) {
|
|
/*
|
|
* APs with pairwise keys should never receive Michael MIC
|
|
* errors for non-zero keyidx because these are reserved for
|
|
* group keys and only the AP is sending real multicast
|
|
* frames in the BSS.
|
|
*/
|
|
if (net_ratelimit())
|
|
printk(KERN_DEBUG "%s: ignored Michael MIC error for "
|
|
"a frame with non-zero keyidx (%d)"
|
|
" (src %s)\n", dev->name, keyidx,
|
|
print_mac(mac, hdr->addr2));
|
|
goto ignore;
|
|
}
|
|
|
|
if ((rx->fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_DATA &&
|
|
((rx->fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_MGMT ||
|
|
(rx->fc & IEEE80211_FCTL_STYPE) != IEEE80211_STYPE_AUTH)) {
|
|
if (net_ratelimit())
|
|
printk(KERN_DEBUG "%s: ignored spurious Michael MIC "
|
|
"error for a frame that cannot be encrypted "
|
|
"(fc=0x%04x) (src %s)\n",
|
|
dev->name, rx->fc, print_mac(mac, hdr->addr2));
|
|
goto ignore;
|
|
}
|
|
|
|
mac80211_ev_michael_mic_failure(rx->dev, keyidx, hdr);
|
|
ignore:
|
|
dev_kfree_skb(rx->skb);
|
|
rx->skb = NULL;
|
|
}
|
|
|
|
ieee80211_rx_handler ieee80211_rx_handlers[] =
|
|
{
|
|
ieee80211_rx_h_if_stats,
|
|
ieee80211_rx_h_passive_scan,
|
|
ieee80211_rx_h_check,
|
|
ieee80211_rx_h_decrypt,
|
|
ieee80211_rx_h_sta_process,
|
|
ieee80211_rx_h_defragment,
|
|
ieee80211_rx_h_ps_poll,
|
|
ieee80211_rx_h_michael_mic_verify,
|
|
/* this must be after decryption - so header is counted in MPDU mic
|
|
* must be before pae and data, so QOS_DATA format frames
|
|
* are not passed to user space by these functions
|
|
*/
|
|
ieee80211_rx_h_remove_qos_control,
|
|
ieee80211_rx_h_amsdu,
|
|
ieee80211_rx_h_data,
|
|
ieee80211_rx_h_ctrl,
|
|
ieee80211_rx_h_mgmt,
|
|
NULL
|
|
};
|
|
|
|
/* main receive path */
|
|
|
|
static int prepare_for_handlers(struct ieee80211_sub_if_data *sdata,
|
|
u8 *bssid, struct ieee80211_txrx_data *rx,
|
|
struct ieee80211_hdr *hdr)
|
|
{
|
|
int multicast = is_multicast_ether_addr(hdr->addr1);
|
|
|
|
switch (sdata->vif.type) {
|
|
case IEEE80211_IF_TYPE_STA:
|
|
if (!bssid)
|
|
return 0;
|
|
if (!ieee80211_bssid_match(bssid, sdata->u.sta.bssid)) {
|
|
if (!(rx->flags & IEEE80211_TXRXD_RXIN_SCAN))
|
|
return 0;
|
|
rx->flags &= ~IEEE80211_TXRXD_RXRA_MATCH;
|
|
} else if (!multicast &&
|
|
compare_ether_addr(sdata->dev->dev_addr,
|
|
hdr->addr1) != 0) {
|
|
if (!(sdata->dev->flags & IFF_PROMISC))
|
|
return 0;
|
|
rx->flags &= ~IEEE80211_TXRXD_RXRA_MATCH;
|
|
}
|
|
break;
|
|
case IEEE80211_IF_TYPE_IBSS:
|
|
if (!bssid)
|
|
return 0;
|
|
if (!ieee80211_bssid_match(bssid, sdata->u.sta.bssid)) {
|
|
if (!(rx->flags & IEEE80211_TXRXD_RXIN_SCAN))
|
|
return 0;
|
|
rx->flags &= ~IEEE80211_TXRXD_RXRA_MATCH;
|
|
} else if (!multicast &&
|
|
compare_ether_addr(sdata->dev->dev_addr,
|
|
hdr->addr1) != 0) {
|
|
if (!(sdata->dev->flags & IFF_PROMISC))
|
|
return 0;
|
|
rx->flags &= ~IEEE80211_TXRXD_RXRA_MATCH;
|
|
} else if (!rx->sta)
|
|
rx->sta = ieee80211_ibss_add_sta(sdata->dev, rx->skb,
|
|
bssid, hdr->addr2);
|
|
break;
|
|
case IEEE80211_IF_TYPE_VLAN:
|
|
case IEEE80211_IF_TYPE_AP:
|
|
if (!bssid) {
|
|
if (compare_ether_addr(sdata->dev->dev_addr,
|
|
hdr->addr1))
|
|
return 0;
|
|
} else if (!ieee80211_bssid_match(bssid,
|
|
sdata->dev->dev_addr)) {
|
|
if (!(rx->flags & IEEE80211_TXRXD_RXIN_SCAN))
|
|
return 0;
|
|
rx->flags &= ~IEEE80211_TXRXD_RXRA_MATCH;
|
|
}
|
|
if (sdata->dev == sdata->local->mdev &&
|
|
!(rx->flags & IEEE80211_TXRXD_RXIN_SCAN))
|
|
/* do not receive anything via
|
|
* master device when not scanning */
|
|
return 0;
|
|
break;
|
|
case IEEE80211_IF_TYPE_WDS:
|
|
if (bssid ||
|
|
(rx->fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_DATA)
|
|
return 0;
|
|
if (compare_ether_addr(sdata->u.wds.remote_addr, hdr->addr2))
|
|
return 0;
|
|
break;
|
|
case IEEE80211_IF_TYPE_MNTR:
|
|
/* take everything */
|
|
break;
|
|
case IEEE80211_IF_TYPE_INVALID:
|
|
/* should never get here */
|
|
WARN_ON(1);
|
|
break;
|
|
}
|
|
|
|
return 1;
|
|
}
|
|
|
|
/*
|
|
* This is the actual Rx frames handler. as it blongs to Rx path it must
|
|
* be called with rcu_read_lock protection.
|
|
*/
|
|
static void __ieee80211_rx_handle_packet(struct ieee80211_hw *hw,
|
|
struct sk_buff *skb,
|
|
struct ieee80211_rx_status *status,
|
|
u32 load)
|
|
{
|
|
struct ieee80211_local *local = hw_to_local(hw);
|
|
struct ieee80211_sub_if_data *sdata;
|
|
struct sta_info *sta;
|
|
struct ieee80211_hdr *hdr;
|
|
struct ieee80211_txrx_data rx;
|
|
u16 type;
|
|
int prepares;
|
|
struct ieee80211_sub_if_data *prev = NULL;
|
|
struct sk_buff *skb_new;
|
|
u8 *bssid;
|
|
|
|
hdr = (struct ieee80211_hdr *) skb->data;
|
|
memset(&rx, 0, sizeof(rx));
|
|
rx.skb = skb;
|
|
rx.local = local;
|
|
|
|
rx.u.rx.status = status;
|
|
rx.u.rx.load = load;
|
|
rx.fc = le16_to_cpu(hdr->frame_control);
|
|
type = rx.fc & IEEE80211_FCTL_FTYPE;
|
|
|
|
if (type == IEEE80211_FTYPE_DATA || type == IEEE80211_FTYPE_MGMT)
|
|
local->dot11ReceivedFragmentCount++;
|
|
|
|
sta = rx.sta = sta_info_get(local, hdr->addr2);
|
|
if (sta) {
|
|
rx.dev = rx.sta->dev;
|
|
rx.sdata = IEEE80211_DEV_TO_SUB_IF(rx.dev);
|
|
}
|
|
|
|
if ((status->flag & RX_FLAG_MMIC_ERROR)) {
|
|
ieee80211_rx_michael_mic_report(local->mdev, hdr, sta, &rx);
|
|
goto end;
|
|
}
|
|
|
|
if (unlikely(local->sta_sw_scanning || local->sta_hw_scanning))
|
|
rx.flags |= IEEE80211_TXRXD_RXIN_SCAN;
|
|
|
|
if (__ieee80211_invoke_rx_handlers(local, local->rx_pre_handlers, &rx,
|
|
sta) != TXRX_CONTINUE)
|
|
goto end;
|
|
skb = rx.skb;
|
|
|
|
if (sta && !(sta->flags & (WLAN_STA_WDS | WLAN_STA_ASSOC_AP)) &&
|
|
!atomic_read(&local->iff_promiscs) &&
|
|
!is_multicast_ether_addr(hdr->addr1)) {
|
|
rx.flags |= IEEE80211_TXRXD_RXRA_MATCH;
|
|
ieee80211_invoke_rx_handlers(local, local->rx_handlers, &rx,
|
|
rx.sta);
|
|
sta_info_put(sta);
|
|
return;
|
|
}
|
|
|
|
list_for_each_entry_rcu(sdata, &local->interfaces, list) {
|
|
if (!netif_running(sdata->dev))
|
|
continue;
|
|
|
|
if (sdata->vif.type == IEEE80211_IF_TYPE_MNTR)
|
|
continue;
|
|
|
|
bssid = ieee80211_get_bssid(hdr, skb->len, sdata->vif.type);
|
|
rx.flags |= IEEE80211_TXRXD_RXRA_MATCH;
|
|
prepares = prepare_for_handlers(sdata, bssid, &rx, hdr);
|
|
/* prepare_for_handlers can change sta */
|
|
sta = rx.sta;
|
|
|
|
if (!prepares)
|
|
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;
|
|
}
|
|
|
|
/*
|
|
* frame was destined for the previous interface
|
|
* so invoke RX handlers for it
|
|
*/
|
|
|
|
skb_new = skb_copy(skb, GFP_ATOMIC);
|
|
if (!skb_new) {
|
|
if (net_ratelimit())
|
|
printk(KERN_DEBUG "%s: failed to copy "
|
|
"multicast frame for %s",
|
|
wiphy_name(local->hw.wiphy),
|
|
prev->dev->name);
|
|
continue;
|
|
}
|
|
rx.fc = le16_to_cpu(hdr->frame_control);
|
|
rx.skb = skb_new;
|
|
rx.dev = prev->dev;
|
|
rx.sdata = prev;
|
|
ieee80211_invoke_rx_handlers(local, local->rx_handlers,
|
|
&rx, sta);
|
|
prev = sdata;
|
|
}
|
|
if (prev) {
|
|
rx.fc = le16_to_cpu(hdr->frame_control);
|
|
rx.skb = skb;
|
|
rx.dev = prev->dev;
|
|
rx.sdata = prev;
|
|
ieee80211_invoke_rx_handlers(local, local->rx_handlers,
|
|
&rx, sta);
|
|
} else
|
|
dev_kfree_skb(skb);
|
|
|
|
end:
|
|
if (sta)
|
|
sta_info_put(sta);
|
|
}
|
|
|
|
#define SEQ_MODULO 0x1000
|
|
#define SEQ_MASK 0xfff
|
|
|
|
static inline int seq_less(u16 sq1, u16 sq2)
|
|
{
|
|
return (((sq1 - sq2) & SEQ_MASK) > (SEQ_MODULO >> 1));
|
|
}
|
|
|
|
static inline u16 seq_inc(u16 sq)
|
|
{
|
|
return ((sq + 1) & SEQ_MASK);
|
|
}
|
|
|
|
static inline u16 seq_sub(u16 sq1, u16 sq2)
|
|
{
|
|
return ((sq1 - sq2) & SEQ_MASK);
|
|
}
|
|
|
|
|
|
/*
|
|
* As it function blongs to Rx path it must be called with
|
|
* the proper rcu_read_lock protection for its flow.
|
|
*/
|
|
u8 ieee80211_sta_manage_reorder_buf(struct ieee80211_hw *hw,
|
|
struct tid_ampdu_rx *tid_agg_rx,
|
|
struct sk_buff *skb, u16 mpdu_seq_num,
|
|
int bar_req)
|
|
{
|
|
struct ieee80211_local *local = hw_to_local(hw);
|
|
struct ieee80211_rx_status status;
|
|
u16 head_seq_num, buf_size;
|
|
int index;
|
|
u32 pkt_load;
|
|
|
|
buf_size = tid_agg_rx->buf_size;
|
|
head_seq_num = tid_agg_rx->head_seq_num;
|
|
|
|
/* frame with out of date sequence number */
|
|
if (seq_less(mpdu_seq_num, head_seq_num)) {
|
|
dev_kfree_skb(skb);
|
|
return 1;
|
|
}
|
|
|
|
/* if frame sequence number exceeds our buffering window size or
|
|
* block Ack Request arrived - release stored frames */
|
|
if ((!seq_less(mpdu_seq_num, head_seq_num + buf_size)) || (bar_req)) {
|
|
/* new head to the ordering buffer */
|
|
if (bar_req)
|
|
head_seq_num = mpdu_seq_num;
|
|
else
|
|
head_seq_num =
|
|
seq_inc(seq_sub(mpdu_seq_num, buf_size));
|
|
/* release stored frames up to new head to stack */
|
|
while (seq_less(tid_agg_rx->head_seq_num, head_seq_num)) {
|
|
index = seq_sub(tid_agg_rx->head_seq_num,
|
|
tid_agg_rx->ssn)
|
|
% tid_agg_rx->buf_size;
|
|
|
|
if (tid_agg_rx->reorder_buf[index]) {
|
|
/* release the reordered frames to stack */
|
|
memcpy(&status,
|
|
tid_agg_rx->reorder_buf[index]->cb,
|
|
sizeof(status));
|
|
pkt_load = ieee80211_rx_load_stats(local,
|
|
tid_agg_rx->reorder_buf[index],
|
|
&status);
|
|
__ieee80211_rx_handle_packet(hw,
|
|
tid_agg_rx->reorder_buf[index],
|
|
&status, pkt_load);
|
|
tid_agg_rx->stored_mpdu_num--;
|
|
tid_agg_rx->reorder_buf[index] = NULL;
|
|
}
|
|
tid_agg_rx->head_seq_num =
|
|
seq_inc(tid_agg_rx->head_seq_num);
|
|
}
|
|
if (bar_req)
|
|
return 1;
|
|
}
|
|
|
|
/* now the new frame is always in the range of the reordering */
|
|
/* buffer window */
|
|
index = seq_sub(mpdu_seq_num, tid_agg_rx->ssn)
|
|
% tid_agg_rx->buf_size;
|
|
/* check if we already stored this frame */
|
|
if (tid_agg_rx->reorder_buf[index]) {
|
|
dev_kfree_skb(skb);
|
|
return 1;
|
|
}
|
|
|
|
/* if arrived mpdu is in the right order and nothing else stored */
|
|
/* release it immediately */
|
|
if (mpdu_seq_num == tid_agg_rx->head_seq_num &&
|
|
tid_agg_rx->stored_mpdu_num == 0) {
|
|
tid_agg_rx->head_seq_num =
|
|
seq_inc(tid_agg_rx->head_seq_num);
|
|
return 0;
|
|
}
|
|
|
|
/* put the frame in the reordering buffer */
|
|
tid_agg_rx->reorder_buf[index] = skb;
|
|
tid_agg_rx->stored_mpdu_num++;
|
|
/* release the buffer until next missing frame */
|
|
index = seq_sub(tid_agg_rx->head_seq_num, tid_agg_rx->ssn)
|
|
% tid_agg_rx->buf_size;
|
|
while (tid_agg_rx->reorder_buf[index]) {
|
|
/* release the reordered frame back to stack */
|
|
memcpy(&status, tid_agg_rx->reorder_buf[index]->cb,
|
|
sizeof(status));
|
|
pkt_load = ieee80211_rx_load_stats(local,
|
|
tid_agg_rx->reorder_buf[index],
|
|
&status);
|
|
__ieee80211_rx_handle_packet(hw, tid_agg_rx->reorder_buf[index],
|
|
&status, pkt_load);
|
|
tid_agg_rx->stored_mpdu_num--;
|
|
tid_agg_rx->reorder_buf[index] = NULL;
|
|
tid_agg_rx->head_seq_num = seq_inc(tid_agg_rx->head_seq_num);
|
|
index = seq_sub(tid_agg_rx->head_seq_num,
|
|
tid_agg_rx->ssn) % tid_agg_rx->buf_size;
|
|
}
|
|
return 1;
|
|
}
|
|
|
|
static u8 ieee80211_rx_reorder_ampdu(struct ieee80211_local *local,
|
|
struct sk_buff *skb)
|
|
{
|
|
struct ieee80211_hw *hw = &local->hw;
|
|
struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
|
|
struct sta_info *sta;
|
|
struct tid_ampdu_rx *tid_agg_rx;
|
|
u16 fc, sc;
|
|
u16 mpdu_seq_num;
|
|
u8 ret = 0, *qc;
|
|
int tid;
|
|
|
|
sta = sta_info_get(local, hdr->addr2);
|
|
if (!sta)
|
|
return ret;
|
|
|
|
fc = le16_to_cpu(hdr->frame_control);
|
|
|
|
/* filter the QoS data rx stream according to
|
|
* STA/TID and check if this STA/TID is on aggregation */
|
|
if (!WLAN_FC_IS_QOS_DATA(fc))
|
|
goto end_reorder;
|
|
|
|
qc = skb->data + ieee80211_get_hdrlen(fc) - QOS_CONTROL_LEN;
|
|
tid = qc[0] & QOS_CONTROL_TID_MASK;
|
|
tid_agg_rx = &(sta->ampdu_mlme.tid_rx[tid]);
|
|
|
|
if (tid_agg_rx->state != HT_AGG_STATE_OPERATIONAL)
|
|
goto end_reorder;
|
|
|
|
/* null data frames are excluded */
|
|
if (unlikely(fc & IEEE80211_STYPE_NULLFUNC))
|
|
goto end_reorder;
|
|
|
|
/* new un-ordered ampdu frame - process it */
|
|
|
|
/* reset session timer */
|
|
if (tid_agg_rx->timeout) {
|
|
unsigned long expires =
|
|
jiffies + (tid_agg_rx->timeout / 1000) * HZ;
|
|
mod_timer(&tid_agg_rx->session_timer, expires);
|
|
}
|
|
|
|
/* if this mpdu is fragmented - terminate rx aggregation session */
|
|
sc = le16_to_cpu(hdr->seq_ctrl);
|
|
if (sc & IEEE80211_SCTL_FRAG) {
|
|
ieee80211_sta_stop_rx_ba_session(sta->dev, sta->addr,
|
|
tid, 0, WLAN_REASON_QSTA_REQUIRE_SETUP);
|
|
ret = 1;
|
|
goto end_reorder;
|
|
}
|
|
|
|
/* according to mpdu sequence number deal with reordering buffer */
|
|
mpdu_seq_num = (sc & IEEE80211_SCTL_SEQ) >> 4;
|
|
ret = ieee80211_sta_manage_reorder_buf(hw, tid_agg_rx, skb,
|
|
mpdu_seq_num, 0);
|
|
end_reorder:
|
|
if (sta)
|
|
sta_info_put(sta);
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* This is the receive path handler. It is called by a low level driver when an
|
|
* 802.11 MPDU is received from the hardware.
|
|
*/
|
|
void __ieee80211_rx(struct ieee80211_hw *hw, struct sk_buff *skb,
|
|
struct ieee80211_rx_status *status)
|
|
{
|
|
struct ieee80211_local *local = hw_to_local(hw);
|
|
u32 pkt_load;
|
|
|
|
/*
|
|
* 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, status);
|
|
if (!skb) {
|
|
rcu_read_unlock();
|
|
return;
|
|
}
|
|
|
|
pkt_load = ieee80211_rx_load_stats(local, skb, status);
|
|
local->channel_use_raw += pkt_load;
|
|
|
|
if (!ieee80211_rx_reorder_ampdu(local, skb))
|
|
__ieee80211_rx_handle_packet(hw, skb, status, pkt_load);
|
|
|
|
rcu_read_unlock();
|
|
}
|
|
EXPORT_SYMBOL(__ieee80211_rx);
|
|
|
|
/* This is a version of the rx handler that can be called from hard irq
|
|
* context. Post the skb on the queue and schedule the tasklet */
|
|
void ieee80211_rx_irqsafe(struct ieee80211_hw *hw, struct sk_buff *skb,
|
|
struct ieee80211_rx_status *status)
|
|
{
|
|
struct ieee80211_local *local = hw_to_local(hw);
|
|
|
|
BUILD_BUG_ON(sizeof(struct ieee80211_rx_status) > sizeof(skb->cb));
|
|
|
|
skb->dev = local->mdev;
|
|
/* copy status into skb->cb for use by tasklet */
|
|
memcpy(skb->cb, status, sizeof(*status));
|
|
skb->pkt_type = IEEE80211_RX_MSG;
|
|
skb_queue_tail(&local->skb_queue, skb);
|
|
tasklet_schedule(&local->tasklet);
|
|
}
|
|
EXPORT_SYMBOL(ieee80211_rx_irqsafe);
|