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xianfeng |
/*
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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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/*
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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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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_rtap_hdr {
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struct ieee80211_radiotap_header hdr;
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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)) *rthdr;
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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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needed_headroom = sizeof(*rthdr);
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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, sizeof(*rthdr), 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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rthdr = (void *) skb_push(skb, sizeof(*rthdr));
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memset(rthdr, 0, sizeof(*rthdr));
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rthdr->hdr.it_len = cpu_to_le16(sizeof(*rthdr));
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rthdr->hdr.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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rthdr->flags = local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS ?
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IEEE80211_RADIOTAP_F_FCS : 0;
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/* FIXME: when radiotap gets a 'bad PLCP' flag use it here */
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rthdr->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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rthdr->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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rthdr->rate = rate->rate / 5;
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rthdr->chan_freq = cpu_to_le16(status->freq);
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if (status->phymode == MODE_IEEE80211A)
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rthdr->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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rthdr->chan_flags =
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cpu_to_le16(IEEE80211_CHAN_DYN |
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IEEE80211_CHAN_2GHZ);
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rthdr->antsignal = status->ssi;
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}
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skb_set_mac_header(skb, 0);
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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->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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} 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 ieee80211_txrx_result
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ieee80211_rx_h_load_stats(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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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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279 |
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280 |
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/* Estimate total channel use caused by this frame */
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281 |
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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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286 |
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for (i = 0; i < mode->num_rates; i++) {
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287 |
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if (mode->rates[i].val == rx->u.rx.status->rate) {
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rate = &mode->rates[i];
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break;
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290 |
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}
|
291 |
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}
|
292 |
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293 |
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/* 1 bit at 1 Mbit/s takes 1 usec; in channel_use values,
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294 |
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* 1 usec = 1/8 * (1080 / 10) = 13.5 */
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295 |
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|
296 |
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if (mode->mode == MODE_IEEE80211A ||
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297 |
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(mode->mode == MODE_IEEE80211G &&
|
298 |
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rate->flags & IEEE80211_RATE_ERP))
|
299 |
|
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hdrtime = CHAN_UTIL_HDR_SHORT;
|
300 |
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else
|
301 |
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hdrtime = CHAN_UTIL_HDR_LONG;
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302 |
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|
303 |
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load = hdrtime;
|
304 |
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if (!is_multicast_ether_addr(hdr->addr1))
|
305 |
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load += hdrtime;
|
306 |
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|
307 |
|
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load += skb->len * rate->rate_inv;
|
308 |
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|
309 |
|
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/* Divide channel_use by 8 to avoid wrapping around the counter */
|
310 |
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load >>= CHAN_UTIL_SHIFT;
|
311 |
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local->channel_use_raw += load;
|
312 |
|
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rx->u.rx.load = load;
|
313 |
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|
314 |
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return TXRX_CONTINUE;
|
315 |
|
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}
|
316 |
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|
|
317 |
|
|
ieee80211_rx_handler ieee80211_rx_pre_handlers[] =
|
318 |
|
|
{
|
319 |
|
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ieee80211_rx_h_parse_qos,
|
320 |
|
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ieee80211_rx_h_load_stats,
|
321 |
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NULL
|
322 |
|
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};
|
323 |
|
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|
324 |
|
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/* rx handlers */
|
325 |
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|
326 |
|
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static ieee80211_txrx_result
|
327 |
|
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ieee80211_rx_h_if_stats(struct ieee80211_txrx_data *rx)
|
328 |
|
|
{
|
329 |
|
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if (rx->sta)
|
330 |
|
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rx->sta->channel_use_raw += rx->u.rx.load;
|
331 |
|
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rx->sdata->channel_use_raw += rx->u.rx.load;
|
332 |
|
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return TXRX_CONTINUE;
|
333 |
|
|
}
|
334 |
|
|
|
335 |
|
|
static ieee80211_txrx_result
|
336 |
|
|
ieee80211_rx_h_passive_scan(struct ieee80211_txrx_data *rx)
|
337 |
|
|
{
|
338 |
|
|
struct ieee80211_local *local = rx->local;
|
339 |
|
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struct sk_buff *skb = rx->skb;
|
340 |
|
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|
341 |
|
|
if (unlikely(local->sta_scanning != 0)) {
|
342 |
|
|
ieee80211_sta_rx_scan(rx->dev, skb, rx->u.rx.status);
|
343 |
|
|
return TXRX_QUEUED;
|
344 |
|
|
}
|
345 |
|
|
|
346 |
|
|
if (unlikely(rx->flags & IEEE80211_TXRXD_RXIN_SCAN)) {
|
347 |
|
|
/* scanning finished during invoking of handlers */
|
348 |
|
|
I802_DEBUG_INC(local->rx_handlers_drop_passive_scan);
|
349 |
|
|
return TXRX_DROP;
|
350 |
|
|
}
|
351 |
|
|
|
352 |
|
|
return TXRX_CONTINUE;
|
353 |
|
|
}
|
354 |
|
|
|
355 |
|
|
static ieee80211_txrx_result
|
356 |
|
|
ieee80211_rx_h_check(struct ieee80211_txrx_data *rx)
|
357 |
|
|
{
|
358 |
|
|
struct ieee80211_hdr *hdr;
|
359 |
|
|
hdr = (struct ieee80211_hdr *) rx->skb->data;
|
360 |
|
|
|
361 |
|
|
/* Drop duplicate 802.11 retransmissions (IEEE 802.11 Chap. 9.2.9) */
|
362 |
|
|
if (rx->sta && !is_multicast_ether_addr(hdr->addr1)) {
|
363 |
|
|
if (unlikely(rx->fc & IEEE80211_FCTL_RETRY &&
|
364 |
|
|
rx->sta->last_seq_ctrl[rx->u.rx.queue] ==
|
365 |
|
|
hdr->seq_ctrl)) {
|
366 |
|
|
if (rx->flags & IEEE80211_TXRXD_RXRA_MATCH) {
|
367 |
|
|
rx->local->dot11FrameDuplicateCount++;
|
368 |
|
|
rx->sta->num_duplicates++;
|
369 |
|
|
}
|
370 |
|
|
return TXRX_DROP;
|
371 |
|
|
} else
|
372 |
|
|
rx->sta->last_seq_ctrl[rx->u.rx.queue] = hdr->seq_ctrl;
|
373 |
|
|
}
|
374 |
|
|
|
375 |
|
|
if (unlikely(rx->skb->len < 16)) {
|
376 |
|
|
I802_DEBUG_INC(rx->local->rx_handlers_drop_short);
|
377 |
|
|
return TXRX_DROP;
|
378 |
|
|
}
|
379 |
|
|
|
380 |
|
|
if (!(rx->flags & IEEE80211_TXRXD_RXRA_MATCH))
|
381 |
|
|
rx->skb->pkt_type = PACKET_OTHERHOST;
|
382 |
|
|
else if (compare_ether_addr(rx->dev->dev_addr, hdr->addr1) == 0)
|
383 |
|
|
rx->skb->pkt_type = PACKET_HOST;
|
384 |
|
|
else if (is_multicast_ether_addr(hdr->addr1)) {
|
385 |
|
|
if (is_broadcast_ether_addr(hdr->addr1))
|
386 |
|
|
rx->skb->pkt_type = PACKET_BROADCAST;
|
387 |
|
|
else
|
388 |
|
|
rx->skb->pkt_type = PACKET_MULTICAST;
|
389 |
|
|
} else
|
390 |
|
|
rx->skb->pkt_type = PACKET_OTHERHOST;
|
391 |
|
|
|
392 |
|
|
/* Drop disallowed frame classes based on STA auth/assoc state;
|
393 |
|
|
* IEEE 802.11, Chap 5.5.
|
394 |
|
|
*
|
395 |
|
|
* 80211.o does filtering only based on association state, i.e., it
|
396 |
|
|
* drops Class 3 frames from not associated stations. hostapd sends
|
397 |
|
|
* deauth/disassoc frames when needed. In addition, hostapd is
|
398 |
|
|
* responsible for filtering on both auth and assoc states.
|
399 |
|
|
*/
|
400 |
|
|
if (unlikely(((rx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_DATA ||
|
401 |
|
|
((rx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_CTL &&
|
402 |
|
|
(rx->fc & IEEE80211_FCTL_STYPE) == IEEE80211_STYPE_PSPOLL)) &&
|
403 |
|
|
rx->sdata->type != IEEE80211_IF_TYPE_IBSS &&
|
404 |
|
|
(!rx->sta || !(rx->sta->flags & WLAN_STA_ASSOC)))) {
|
405 |
|
|
if ((!(rx->fc & IEEE80211_FCTL_FROMDS) &&
|
406 |
|
|
!(rx->fc & IEEE80211_FCTL_TODS) &&
|
407 |
|
|
(rx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_DATA)
|
408 |
|
|
|| !(rx->flags & IEEE80211_TXRXD_RXRA_MATCH)) {
|
409 |
|
|
/* Drop IBSS frames and frames for other hosts
|
410 |
|
|
* silently. */
|
411 |
|
|
return TXRX_DROP;
|
412 |
|
|
}
|
413 |
|
|
|
414 |
|
|
return TXRX_DROP;
|
415 |
|
|
}
|
416 |
|
|
|
417 |
|
|
return TXRX_CONTINUE;
|
418 |
|
|
}
|
419 |
|
|
|
420 |
|
|
|
421 |
|
|
static ieee80211_txrx_result
|
422 |
|
|
ieee80211_rx_h_decrypt(struct ieee80211_txrx_data *rx)
|
423 |
|
|
{
|
424 |
|
|
struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) rx->skb->data;
|
425 |
|
|
int keyidx;
|
426 |
|
|
int hdrlen;
|
427 |
|
|
ieee80211_txrx_result result = TXRX_DROP;
|
428 |
|
|
struct ieee80211_key *stakey = NULL;
|
429 |
|
|
|
430 |
|
|
/*
|
431 |
|
|
* Key selection 101
|
432 |
|
|
*
|
433 |
|
|
* There are three types of keys:
|
434 |
|
|
* - GTK (group keys)
|
435 |
|
|
* - PTK (pairwise keys)
|
436 |
|
|
* - STK (station-to-station pairwise keys)
|
437 |
|
|
*
|
438 |
|
|
* When selecting a key, we have to distinguish between multicast
|
439 |
|
|
* (including broadcast) and unicast frames, the latter can only
|
440 |
|
|
* use PTKs and STKs while the former always use GTKs. Unless, of
|
441 |
|
|
* course, actual WEP keys ("pre-RSNA") are used, then unicast
|
442 |
|
|
* frames can also use key indizes like GTKs. Hence, if we don't
|
443 |
|
|
* have a PTK/STK we check the key index for a WEP key.
|
444 |
|
|
*
|
445 |
|
|
* Note that in a regular BSS, multicast frames are sent by the
|
446 |
|
|
* AP only, associated stations unicast the frame to the AP first
|
447 |
|
|
* which then multicasts it on their behalf.
|
448 |
|
|
*
|
449 |
|
|
* There is also a slight problem in IBSS mode: GTKs are negotiated
|
450 |
|
|
* with each station, that is something we don't currently handle.
|
451 |
|
|
* The spec seems to expect that one negotiates the same key with
|
452 |
|
|
* every station but there's no such requirement; VLANs could be
|
453 |
|
|
* possible.
|
454 |
|
|
*/
|
455 |
|
|
|
456 |
|
|
if (!(rx->fc & IEEE80211_FCTL_PROTECTED))
|
457 |
|
|
return TXRX_CONTINUE;
|
458 |
|
|
|
459 |
|
|
/*
|
460 |
|
|
* No point in finding a key and decrypting if the frame is neither
|
461 |
|
|
* addressed to us nor a multicast frame.
|
462 |
|
|
*/
|
463 |
|
|
if (!(rx->flags & IEEE80211_TXRXD_RXRA_MATCH))
|
464 |
|
|
return TXRX_CONTINUE;
|
465 |
|
|
|
466 |
|
|
if (rx->sta)
|
467 |
|
|
stakey = rcu_dereference(rx->sta->key);
|
468 |
|
|
|
469 |
|
|
if (!is_multicast_ether_addr(hdr->addr1) && stakey) {
|
470 |
|
|
rx->key = stakey;
|
471 |
|
|
} else {
|
472 |
|
|
/*
|
473 |
|
|
* The device doesn't give us the IV so we won't be
|
474 |
|
|
* able to look up the key. That's ok though, we
|
475 |
|
|
* don't need to decrypt the frame, we just won't
|
476 |
|
|
* be able to keep statistics accurate.
|
477 |
|
|
* Except for key threshold notifications, should
|
478 |
|
|
* we somehow allow the driver to tell us which key
|
479 |
|
|
* the hardware used if this flag is set?
|
480 |
|
|
*/
|
481 |
|
|
if ((rx->u.rx.status->flag & RX_FLAG_DECRYPTED) &&
|
482 |
|
|
(rx->u.rx.status->flag & RX_FLAG_IV_STRIPPED))
|
483 |
|
|
return TXRX_CONTINUE;
|
484 |
|
|
|
485 |
|
|
hdrlen = ieee80211_get_hdrlen(rx->fc);
|
486 |
|
|
|
487 |
|
|
if (rx->skb->len < 8 + hdrlen)
|
488 |
|
|
return TXRX_DROP; /* TODO: count this? */
|
489 |
|
|
|
490 |
|
|
/*
|
491 |
|
|
* no need to call ieee80211_wep_get_keyidx,
|
492 |
|
|
* it verifies a bunch of things we've done already
|
493 |
|
|
*/
|
494 |
|
|
keyidx = rx->skb->data[hdrlen + 3] >> 6;
|
495 |
|
|
|
496 |
|
|
rx->key = rcu_dereference(rx->sdata->keys[keyidx]);
|
497 |
|
|
|
498 |
|
|
/*
|
499 |
|
|
* RSNA-protected unicast frames should always be sent with
|
500 |
|
|
* pairwise or station-to-station keys, but for WEP we allow
|
501 |
|
|
* using a key index as well.
|
502 |
|
|
*/
|
503 |
|
|
if (rx->key && rx->key->conf.alg != ALG_WEP &&
|
504 |
|
|
!is_multicast_ether_addr(hdr->addr1))
|
505 |
|
|
rx->key = NULL;
|
506 |
|
|
}
|
507 |
|
|
|
508 |
|
|
if (rx->key) {
|
509 |
|
|
rx->key->tx_rx_count++;
|
510 |
|
|
/* TODO: add threshold stuff again */
|
511 |
|
|
} else {
|
512 |
|
|
#ifdef CONFIG_MAC80211_DEBUG
|
513 |
|
|
if (net_ratelimit())
|
514 |
|
|
printk(KERN_DEBUG "%s: RX protected frame,"
|
515 |
|
|
" but have no key\n", rx->dev->name);
|
516 |
|
|
#endif /* CONFIG_MAC80211_DEBUG */
|
517 |
|
|
return TXRX_DROP;
|
518 |
|
|
}
|
519 |
|
|
|
520 |
|
|
/* Check for weak IVs if possible */
|
521 |
|
|
if (rx->sta && rx->key->conf.alg == ALG_WEP &&
|
522 |
|
|
((rx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_DATA) &&
|
523 |
|
|
(!(rx->u.rx.status->flag & RX_FLAG_IV_STRIPPED) ||
|
524 |
|
|
!(rx->u.rx.status->flag & RX_FLAG_DECRYPTED)) &&
|
525 |
|
|
ieee80211_wep_is_weak_iv(rx->skb, rx->key))
|
526 |
|
|
rx->sta->wep_weak_iv_count++;
|
527 |
|
|
|
528 |
|
|
switch (rx->key->conf.alg) {
|
529 |
|
|
case ALG_WEP:
|
530 |
|
|
result = ieee80211_crypto_wep_decrypt(rx);
|
531 |
|
|
break;
|
532 |
|
|
case ALG_TKIP:
|
533 |
|
|
result = ieee80211_crypto_tkip_decrypt(rx);
|
534 |
|
|
break;
|
535 |
|
|
case ALG_CCMP:
|
536 |
|
|
result = ieee80211_crypto_ccmp_decrypt(rx);
|
537 |
|
|
break;
|
538 |
|
|
}
|
539 |
|
|
|
540 |
|
|
/* either the frame has been decrypted or will be dropped */
|
541 |
|
|
rx->u.rx.status->flag |= RX_FLAG_DECRYPTED;
|
542 |
|
|
|
543 |
|
|
return result;
|
544 |
|
|
}
|
545 |
|
|
|
546 |
|
|
static void ap_sta_ps_start(struct net_device *dev, struct sta_info *sta)
|
547 |
|
|
{
|
548 |
|
|
struct ieee80211_sub_if_data *sdata;
|
549 |
|
|
DECLARE_MAC_BUF(mac);
|
550 |
|
|
|
551 |
|
|
sdata = IEEE80211_DEV_TO_SUB_IF(sta->dev);
|
552 |
|
|
|
553 |
|
|
if (sdata->bss)
|
554 |
|
|
atomic_inc(&sdata->bss->num_sta_ps);
|
555 |
|
|
sta->flags |= WLAN_STA_PS;
|
556 |
|
|
sta->pspoll = 0;
|
557 |
|
|
#ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
|
558 |
|
|
printk(KERN_DEBUG "%s: STA %s aid %d enters power save mode\n",
|
559 |
|
|
dev->name, print_mac(mac, sta->addr), sta->aid);
|
560 |
|
|
#endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
|
561 |
|
|
}
|
562 |
|
|
|
563 |
|
|
static int ap_sta_ps_end(struct net_device *dev, struct sta_info *sta)
|
564 |
|
|
{
|
565 |
|
|
struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
|
566 |
|
|
struct sk_buff *skb;
|
567 |
|
|
int sent = 0;
|
568 |
|
|
struct ieee80211_sub_if_data *sdata;
|
569 |
|
|
struct ieee80211_tx_packet_data *pkt_data;
|
570 |
|
|
DECLARE_MAC_BUF(mac);
|
571 |
|
|
|
572 |
|
|
sdata = IEEE80211_DEV_TO_SUB_IF(sta->dev);
|
573 |
|
|
if (sdata->bss)
|
574 |
|
|
atomic_dec(&sdata->bss->num_sta_ps);
|
575 |
|
|
sta->flags &= ~(WLAN_STA_PS | WLAN_STA_TIM);
|
576 |
|
|
sta->pspoll = 0;
|
577 |
|
|
if (!skb_queue_empty(&sta->ps_tx_buf)) {
|
578 |
|
|
if (local->ops->set_tim)
|
579 |
|
|
local->ops->set_tim(local_to_hw(local), sta->aid, 0);
|
580 |
|
|
if (sdata->bss)
|
581 |
|
|
bss_tim_clear(local, sdata->bss, sta->aid);
|
582 |
|
|
}
|
583 |
|
|
#ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
|
584 |
|
|
printk(KERN_DEBUG "%s: STA %s aid %d exits power save mode\n",
|
585 |
|
|
dev->name, print_mac(mac, sta->addr), sta->aid);
|
586 |
|
|
#endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
|
587 |
|
|
/* Send all buffered frames to the station */
|
588 |
|
|
while ((skb = skb_dequeue(&sta->tx_filtered)) != NULL) {
|
589 |
|
|
pkt_data = (struct ieee80211_tx_packet_data *) skb->cb;
|
590 |
|
|
sent++;
|
591 |
|
|
pkt_data->flags |= IEEE80211_TXPD_REQUEUE;
|
592 |
|
|
dev_queue_xmit(skb);
|
593 |
|
|
}
|
594 |
|
|
while ((skb = skb_dequeue(&sta->ps_tx_buf)) != NULL) {
|
595 |
|
|
pkt_data = (struct ieee80211_tx_packet_data *) skb->cb;
|
596 |
|
|
local->total_ps_buffered--;
|
597 |
|
|
sent++;
|
598 |
|
|
#ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
|
599 |
|
|
printk(KERN_DEBUG "%s: STA %s aid %d send PS frame "
|
600 |
|
|
"since STA not sleeping anymore\n", dev->name,
|
601 |
|
|
print_mac(mac, sta->addr), sta->aid);
|
602 |
|
|
#endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
|
603 |
|
|
pkt_data->flags |= IEEE80211_TXPD_REQUEUE;
|
604 |
|
|
dev_queue_xmit(skb);
|
605 |
|
|
}
|
606 |
|
|
|
607 |
|
|
return sent;
|
608 |
|
|
}
|
609 |
|
|
|
610 |
|
|
static ieee80211_txrx_result
|
611 |
|
|
ieee80211_rx_h_sta_process(struct ieee80211_txrx_data *rx)
|
612 |
|
|
{
|
613 |
|
|
struct sta_info *sta = rx->sta;
|
614 |
|
|
struct net_device *dev = rx->dev;
|
615 |
|
|
struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) rx->skb->data;
|
616 |
|
|
|
617 |
|
|
if (!sta)
|
618 |
|
|
return TXRX_CONTINUE;
|
619 |
|
|
|
620 |
|
|
/* Update last_rx only for IBSS packets which are for the current
|
621 |
|
|
* BSSID to avoid keeping the current IBSS network alive in cases where
|
622 |
|
|
* other STAs are using different BSSID. */
|
623 |
|
|
if (rx->sdata->type == IEEE80211_IF_TYPE_IBSS) {
|
624 |
|
|
u8 *bssid = ieee80211_get_bssid(hdr, rx->skb->len);
|
625 |
|
|
if (compare_ether_addr(bssid, rx->sdata->u.sta.bssid) == 0)
|
626 |
|
|
sta->last_rx = jiffies;
|
627 |
|
|
} else
|
628 |
|
|
if (!is_multicast_ether_addr(hdr->addr1) ||
|
629 |
|
|
rx->sdata->type == IEEE80211_IF_TYPE_STA) {
|
630 |
|
|
/* Update last_rx only for unicast frames in order to prevent
|
631 |
|
|
* the Probe Request frames (the only broadcast frames from a
|
632 |
|
|
* STA in infrastructure mode) from keeping a connection alive.
|
633 |
|
|
*/
|
634 |
|
|
sta->last_rx = jiffies;
|
635 |
|
|
}
|
636 |
|
|
|
637 |
|
|
if (!(rx->flags & IEEE80211_TXRXD_RXRA_MATCH))
|
638 |
|
|
return TXRX_CONTINUE;
|
639 |
|
|
|
640 |
|
|
sta->rx_fragments++;
|
641 |
|
|
sta->rx_bytes += rx->skb->len;
|
642 |
|
|
sta->last_rssi = rx->u.rx.status->ssi;
|
643 |
|
|
sta->last_signal = rx->u.rx.status->signal;
|
644 |
|
|
sta->last_noise = rx->u.rx.status->noise;
|
645 |
|
|
|
646 |
|
|
if (!(rx->fc & IEEE80211_FCTL_MOREFRAGS)) {
|
647 |
|
|
/* Change STA power saving mode only in the end of a frame
|
648 |
|
|
* exchange sequence */
|
649 |
|
|
if ((sta->flags & WLAN_STA_PS) && !(rx->fc & IEEE80211_FCTL_PM))
|
650 |
|
|
rx->u.rx.sent_ps_buffered += ap_sta_ps_end(dev, sta);
|
651 |
|
|
else if (!(sta->flags & WLAN_STA_PS) &&
|
652 |
|
|
(rx->fc & IEEE80211_FCTL_PM))
|
653 |
|
|
ap_sta_ps_start(dev, sta);
|
654 |
|
|
}
|
655 |
|
|
|
656 |
|
|
/* Drop data::nullfunc frames silently, since they are used only to
|
657 |
|
|
* control station power saving mode. */
|
658 |
|
|
if ((rx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_DATA &&
|
659 |
|
|
(rx->fc & IEEE80211_FCTL_STYPE) == IEEE80211_STYPE_NULLFUNC) {
|
660 |
|
|
I802_DEBUG_INC(rx->local->rx_handlers_drop_nullfunc);
|
661 |
|
|
/* Update counter and free packet here to avoid counting this
|
662 |
|
|
* as a dropped packed. */
|
663 |
|
|
sta->rx_packets++;
|
664 |
|
|
dev_kfree_skb(rx->skb);
|
665 |
|
|
return TXRX_QUEUED;
|
666 |
|
|
}
|
667 |
|
|
|
668 |
|
|
return TXRX_CONTINUE;
|
669 |
|
|
} /* ieee80211_rx_h_sta_process */
|
670 |
|
|
|
671 |
|
|
static inline struct ieee80211_fragment_entry *
|
672 |
|
|
ieee80211_reassemble_add(struct ieee80211_sub_if_data *sdata,
|
673 |
|
|
unsigned int frag, unsigned int seq, int rx_queue,
|
674 |
|
|
struct sk_buff **skb)
|
675 |
|
|
{
|
676 |
|
|
struct ieee80211_fragment_entry *entry;
|
677 |
|
|
int idx;
|
678 |
|
|
|
679 |
|
|
idx = sdata->fragment_next;
|
680 |
|
|
entry = &sdata->fragments[sdata->fragment_next++];
|
681 |
|
|
if (sdata->fragment_next >= IEEE80211_FRAGMENT_MAX)
|
682 |
|
|
sdata->fragment_next = 0;
|
683 |
|
|
|
684 |
|
|
if (!skb_queue_empty(&entry->skb_list)) {
|
685 |
|
|
#ifdef CONFIG_MAC80211_DEBUG
|
686 |
|
|
struct ieee80211_hdr *hdr =
|
687 |
|
|
(struct ieee80211_hdr *) entry->skb_list.next->data;
|
688 |
|
|
DECLARE_MAC_BUF(mac);
|
689 |
|
|
DECLARE_MAC_BUF(mac2);
|
690 |
|
|
printk(KERN_DEBUG "%s: RX reassembly removed oldest "
|
691 |
|
|
"fragment entry (idx=%d age=%lu seq=%d last_frag=%d "
|
692 |
|
|
"addr1=%s addr2=%s\n",
|
693 |
|
|
sdata->dev->name, idx,
|
694 |
|
|
jiffies - entry->first_frag_time, entry->seq,
|
695 |
|
|
entry->last_frag, print_mac(mac, hdr->addr1),
|
696 |
|
|
print_mac(mac2, hdr->addr2));
|
697 |
|
|
#endif /* CONFIG_MAC80211_DEBUG */
|
698 |
|
|
__skb_queue_purge(&entry->skb_list);
|
699 |
|
|
}
|
700 |
|
|
|
701 |
|
|
__skb_queue_tail(&entry->skb_list, *skb); /* no need for locking */
|
702 |
|
|
*skb = NULL;
|
703 |
|
|
entry->first_frag_time = jiffies;
|
704 |
|
|
entry->seq = seq;
|
705 |
|
|
entry->rx_queue = rx_queue;
|
706 |
|
|
entry->last_frag = frag;
|
707 |
|
|
entry->ccmp = 0;
|
708 |
|
|
entry->extra_len = 0;
|
709 |
|
|
|
710 |
|
|
return entry;
|
711 |
|
|
}
|
712 |
|
|
|
713 |
|
|
static inline struct ieee80211_fragment_entry *
|
714 |
|
|
ieee80211_reassemble_find(struct ieee80211_sub_if_data *sdata,
|
715 |
|
|
u16 fc, unsigned int frag, unsigned int seq,
|
716 |
|
|
int rx_queue, struct ieee80211_hdr *hdr)
|
717 |
|
|
{
|
718 |
|
|
struct ieee80211_fragment_entry *entry;
|
719 |
|
|
int i, idx;
|
720 |
|
|
|
721 |
|
|
idx = sdata->fragment_next;
|
722 |
|
|
for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++) {
|
723 |
|
|
struct ieee80211_hdr *f_hdr;
|
724 |
|
|
u16 f_fc;
|
725 |
|
|
|
726 |
|
|
idx--;
|
727 |
|
|
if (idx < 0)
|
728 |
|
|
idx = IEEE80211_FRAGMENT_MAX - 1;
|
729 |
|
|
|
730 |
|
|
entry = &sdata->fragments[idx];
|
731 |
|
|
if (skb_queue_empty(&entry->skb_list) || entry->seq != seq ||
|
732 |
|
|
entry->rx_queue != rx_queue ||
|
733 |
|
|
entry->last_frag + 1 != frag)
|
734 |
|
|
continue;
|
735 |
|
|
|
736 |
|
|
f_hdr = (struct ieee80211_hdr *) entry->skb_list.next->data;
|
737 |
|
|
f_fc = le16_to_cpu(f_hdr->frame_control);
|
738 |
|
|
|
739 |
|
|
if ((fc & IEEE80211_FCTL_FTYPE) != (f_fc & IEEE80211_FCTL_FTYPE) ||
|
740 |
|
|
compare_ether_addr(hdr->addr1, f_hdr->addr1) != 0 ||
|
741 |
|
|
compare_ether_addr(hdr->addr2, f_hdr->addr2) != 0)
|
742 |
|
|
continue;
|
743 |
|
|
|
744 |
|
|
if (entry->first_frag_time + 2 * HZ < jiffies) {
|
745 |
|
|
__skb_queue_purge(&entry->skb_list);
|
746 |
|
|
continue;
|
747 |
|
|
}
|
748 |
|
|
return entry;
|
749 |
|
|
}
|
750 |
|
|
|
751 |
|
|
return NULL;
|
752 |
|
|
}
|
753 |
|
|
|
754 |
|
|
static ieee80211_txrx_result
|
755 |
|
|
ieee80211_rx_h_defragment(struct ieee80211_txrx_data *rx)
|
756 |
|
|
{
|
757 |
|
|
struct ieee80211_hdr *hdr;
|
758 |
|
|
u16 sc;
|
759 |
|
|
unsigned int frag, seq;
|
760 |
|
|
struct ieee80211_fragment_entry *entry;
|
761 |
|
|
struct sk_buff *skb;
|
762 |
|
|
DECLARE_MAC_BUF(mac);
|
763 |
|
|
|
764 |
|
|
hdr = (struct ieee80211_hdr *) rx->skb->data;
|
765 |
|
|
sc = le16_to_cpu(hdr->seq_ctrl);
|
766 |
|
|
frag = sc & IEEE80211_SCTL_FRAG;
|
767 |
|
|
|
768 |
|
|
if (likely((!(rx->fc & IEEE80211_FCTL_MOREFRAGS) && frag == 0) ||
|
769 |
|
|
(rx->skb)->len < 24 ||
|
770 |
|
|
is_multicast_ether_addr(hdr->addr1))) {
|
771 |
|
|
/* not fragmented */
|
772 |
|
|
goto out;
|
773 |
|
|
}
|
774 |
|
|
I802_DEBUG_INC(rx->local->rx_handlers_fragments);
|
775 |
|
|
|
776 |
|
|
seq = (sc & IEEE80211_SCTL_SEQ) >> 4;
|
777 |
|
|
|
778 |
|
|
if (frag == 0) {
|
779 |
|
|
/* This is the first fragment of a new frame. */
|
780 |
|
|
entry = ieee80211_reassemble_add(rx->sdata, frag, seq,
|
781 |
|
|
rx->u.rx.queue, &(rx->skb));
|
782 |
|
|
if (rx->key && rx->key->conf.alg == ALG_CCMP &&
|
783 |
|
|
(rx->fc & IEEE80211_FCTL_PROTECTED)) {
|
784 |
|
|
/* Store CCMP PN so that we can verify that the next
|
785 |
|
|
* fragment has a sequential PN value. */
|
786 |
|
|
entry->ccmp = 1;
|
787 |
|
|
memcpy(entry->last_pn,
|
788 |
|
|
rx->key->u.ccmp.rx_pn[rx->u.rx.queue],
|
789 |
|
|
CCMP_PN_LEN);
|
790 |
|
|
}
|
791 |
|
|
return TXRX_QUEUED;
|
792 |
|
|
}
|
793 |
|
|
|
794 |
|
|
/* This is a fragment for a frame that should already be pending in
|
795 |
|
|
* fragment cache. Add this fragment to the end of the pending entry.
|
796 |
|
|
*/
|
797 |
|
|
entry = ieee80211_reassemble_find(rx->sdata, rx->fc, frag, seq,
|
798 |
|
|
rx->u.rx.queue, hdr);
|
799 |
|
|
if (!entry) {
|
800 |
|
|
I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag);
|
801 |
|
|
return TXRX_DROP;
|
802 |
|
|
}
|
803 |
|
|
|
804 |
|
|
/* Verify that MPDUs within one MSDU have sequential PN values.
|
805 |
|
|
* (IEEE 802.11i, 8.3.3.4.5) */
|
806 |
|
|
if (entry->ccmp) {
|
807 |
|
|
int i;
|
808 |
|
|
u8 pn[CCMP_PN_LEN], *rpn;
|
809 |
|
|
if (!rx->key || rx->key->conf.alg != ALG_CCMP)
|
810 |
|
|
return TXRX_DROP;
|
811 |
|
|
memcpy(pn, entry->last_pn, CCMP_PN_LEN);
|
812 |
|
|
for (i = CCMP_PN_LEN - 1; i >= 0; i--) {
|
813 |
|
|
pn[i]++;
|
814 |
|
|
if (pn[i])
|
815 |
|
|
break;
|
816 |
|
|
}
|
817 |
|
|
rpn = rx->key->u.ccmp.rx_pn[rx->u.rx.queue];
|
818 |
|
|
if (memcmp(pn, rpn, CCMP_PN_LEN) != 0) {
|
819 |
|
|
if (net_ratelimit())
|
820 |
|
|
printk(KERN_DEBUG "%s: defrag: CCMP PN not "
|
821 |
|
|
"sequential A2=%s"
|
822 |
|
|
" PN=%02x%02x%02x%02x%02x%02x "
|
823 |
|
|
"(expected %02x%02x%02x%02x%02x%02x)\n",
|
824 |
|
|
rx->dev->name, print_mac(mac, hdr->addr2),
|
825 |
|
|
rpn[0], rpn[1], rpn[2], rpn[3], rpn[4],
|
826 |
|
|
rpn[5], pn[0], pn[1], pn[2], pn[3],
|
827 |
|
|
pn[4], pn[5]);
|
828 |
|
|
return TXRX_DROP;
|
829 |
|
|
}
|
830 |
|
|
memcpy(entry->last_pn, pn, CCMP_PN_LEN);
|
831 |
|
|
}
|
832 |
|
|
|
833 |
|
|
skb_pull(rx->skb, ieee80211_get_hdrlen(rx->fc));
|
834 |
|
|
__skb_queue_tail(&entry->skb_list, rx->skb);
|
835 |
|
|
entry->last_frag = frag;
|
836 |
|
|
entry->extra_len += rx->skb->len;
|
837 |
|
|
if (rx->fc & IEEE80211_FCTL_MOREFRAGS) {
|
838 |
|
|
rx->skb = NULL;
|
839 |
|
|
return TXRX_QUEUED;
|
840 |
|
|
}
|
841 |
|
|
|
842 |
|
|
rx->skb = __skb_dequeue(&entry->skb_list);
|
843 |
|
|
if (skb_tailroom(rx->skb) < entry->extra_len) {
|
844 |
|
|
I802_DEBUG_INC(rx->local->rx_expand_skb_head2);
|
845 |
|
|
if (unlikely(pskb_expand_head(rx->skb, 0, entry->extra_len,
|
846 |
|
|
GFP_ATOMIC))) {
|
847 |
|
|
I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag);
|
848 |
|
|
__skb_queue_purge(&entry->skb_list);
|
849 |
|
|
return TXRX_DROP;
|
850 |
|
|
}
|
851 |
|
|
}
|
852 |
|
|
while ((skb = __skb_dequeue(&entry->skb_list))) {
|
853 |
|
|
memcpy(skb_put(rx->skb, skb->len), skb->data, skb->len);
|
854 |
|
|
dev_kfree_skb(skb);
|
855 |
|
|
}
|
856 |
|
|
|
857 |
|
|
/* Complete frame has been reassembled - process it now */
|
858 |
|
|
rx->flags |= IEEE80211_TXRXD_FRAGMENTED;
|
859 |
|
|
|
860 |
|
|
out:
|
861 |
|
|
if (rx->sta)
|
862 |
|
|
rx->sta->rx_packets++;
|
863 |
|
|
if (is_multicast_ether_addr(hdr->addr1))
|
864 |
|
|
rx->local->dot11MulticastReceivedFrameCount++;
|
865 |
|
|
else
|
866 |
|
|
ieee80211_led_rx(rx->local);
|
867 |
|
|
return TXRX_CONTINUE;
|
868 |
|
|
}
|
869 |
|
|
|
870 |
|
|
static ieee80211_txrx_result
|
871 |
|
|
ieee80211_rx_h_ps_poll(struct ieee80211_txrx_data *rx)
|
872 |
|
|
{
|
873 |
|
|
struct sk_buff *skb;
|
874 |
|
|
int no_pending_pkts;
|
875 |
|
|
DECLARE_MAC_BUF(mac);
|
876 |
|
|
|
877 |
|
|
if (likely(!rx->sta ||
|
878 |
|
|
(rx->fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_CTL ||
|
879 |
|
|
(rx->fc & IEEE80211_FCTL_STYPE) != IEEE80211_STYPE_PSPOLL ||
|
880 |
|
|
!(rx->flags & IEEE80211_TXRXD_RXRA_MATCH)))
|
881 |
|
|
return TXRX_CONTINUE;
|
882 |
|
|
|
883 |
|
|
skb = skb_dequeue(&rx->sta->tx_filtered);
|
884 |
|
|
if (!skb) {
|
885 |
|
|
skb = skb_dequeue(&rx->sta->ps_tx_buf);
|
886 |
|
|
if (skb)
|
887 |
|
|
rx->local->total_ps_buffered--;
|
888 |
|
|
}
|
889 |
|
|
no_pending_pkts = skb_queue_empty(&rx->sta->tx_filtered) &&
|
890 |
|
|
skb_queue_empty(&rx->sta->ps_tx_buf);
|
891 |
|
|
|
892 |
|
|
if (skb) {
|
893 |
|
|
struct ieee80211_hdr *hdr =
|
894 |
|
|
(struct ieee80211_hdr *) skb->data;
|
895 |
|
|
|
896 |
|
|
/* tell TX path to send one frame even though the STA may
|
897 |
|
|
* still remain is PS mode after this frame exchange */
|
898 |
|
|
rx->sta->pspoll = 1;
|
899 |
|
|
|
900 |
|
|
#ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
|
901 |
|
|
printk(KERN_DEBUG "STA %s aid %d: PS Poll (entries after %d)\n",
|
902 |
|
|
print_mac(mac, rx->sta->addr), rx->sta->aid,
|
903 |
|
|
skb_queue_len(&rx->sta->ps_tx_buf));
|
904 |
|
|
#endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
|
905 |
|
|
|
906 |
|
|
/* Use MoreData flag to indicate whether there are more
|
907 |
|
|
* buffered frames for this STA */
|
908 |
|
|
if (no_pending_pkts) {
|
909 |
|
|
hdr->frame_control &= cpu_to_le16(~IEEE80211_FCTL_MOREDATA);
|
910 |
|
|
rx->sta->flags &= ~WLAN_STA_TIM;
|
911 |
|
|
} else
|
912 |
|
|
hdr->frame_control |= cpu_to_le16(IEEE80211_FCTL_MOREDATA);
|
913 |
|
|
|
914 |
|
|
dev_queue_xmit(skb);
|
915 |
|
|
|
916 |
|
|
if (no_pending_pkts) {
|
917 |
|
|
if (rx->local->ops->set_tim)
|
918 |
|
|
rx->local->ops->set_tim(local_to_hw(rx->local),
|
919 |
|
|
rx->sta->aid, 0);
|
920 |
|
|
if (rx->sdata->bss)
|
921 |
|
|
bss_tim_clear(rx->local, rx->sdata->bss, rx->sta->aid);
|
922 |
|
|
}
|
923 |
|
|
#ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
|
924 |
|
|
} else if (!rx->u.rx.sent_ps_buffered) {
|
925 |
|
|
printk(KERN_DEBUG "%s: STA %s sent PS Poll even "
|
926 |
|
|
"though there is no buffered frames for it\n",
|
927 |
|
|
rx->dev->name, print_mac(mac, rx->sta->addr));
|
928 |
|
|
#endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
|
929 |
|
|
|
930 |
|
|
}
|
931 |
|
|
|
932 |
|
|
/* Free PS Poll skb here instead of returning TXRX_DROP that would
|
933 |
|
|
* count as an dropped frame. */
|
934 |
|
|
dev_kfree_skb(rx->skb);
|
935 |
|
|
|
936 |
|
|
return TXRX_QUEUED;
|
937 |
|
|
}
|
938 |
|
|
|
939 |
|
|
static ieee80211_txrx_result
|
940 |
|
|
ieee80211_rx_h_remove_qos_control(struct ieee80211_txrx_data *rx)
|
941 |
|
|
{
|
942 |
|
|
u16 fc = rx->fc;
|
943 |
|
|
u8 *data = rx->skb->data;
|
944 |
|
|
struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) data;
|
945 |
|
|
|
946 |
|
|
if (!WLAN_FC_IS_QOS_DATA(fc))
|
947 |
|
|
return TXRX_CONTINUE;
|
948 |
|
|
|
949 |
|
|
/* remove the qos control field, update frame type and meta-data */
|
950 |
|
|
memmove(data + 2, data, ieee80211_get_hdrlen(fc) - 2);
|
951 |
|
|
hdr = (struct ieee80211_hdr *) skb_pull(rx->skb, 2);
|
952 |
|
|
/* change frame type to non QOS */
|
953 |
|
|
rx->fc = fc &= ~IEEE80211_STYPE_QOS_DATA;
|
954 |
|
|
hdr->frame_control = cpu_to_le16(fc);
|
955 |
|
|
|
956 |
|
|
return TXRX_CONTINUE;
|
957 |
|
|
}
|
958 |
|
|
|
959 |
|
|
static ieee80211_txrx_result
|
960 |
|
|
ieee80211_rx_h_802_1x_pae(struct ieee80211_txrx_data *rx)
|
961 |
|
|
{
|
962 |
|
|
if (rx->sdata->eapol && ieee80211_is_eapol(rx->skb) &&
|
963 |
|
|
rx->sdata->type != IEEE80211_IF_TYPE_STA &&
|
964 |
|
|
(rx->flags & IEEE80211_TXRXD_RXRA_MATCH))
|
965 |
|
|
return TXRX_CONTINUE;
|
966 |
|
|
|
967 |
|
|
if (unlikely(rx->sdata->ieee802_1x &&
|
968 |
|
|
(rx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_DATA &&
|
969 |
|
|
(rx->fc & IEEE80211_FCTL_STYPE) != IEEE80211_STYPE_NULLFUNC &&
|
970 |
|
|
(!rx->sta || !(rx->sta->flags & WLAN_STA_AUTHORIZED)) &&
|
971 |
|
|
!ieee80211_is_eapol(rx->skb))) {
|
972 |
|
|
#ifdef CONFIG_MAC80211_DEBUG
|
973 |
|
|
struct ieee80211_hdr *hdr =
|
974 |
|
|
(struct ieee80211_hdr *) rx->skb->data;
|
975 |
|
|
DECLARE_MAC_BUF(mac);
|
976 |
|
|
printk(KERN_DEBUG "%s: dropped frame from %s"
|
977 |
|
|
" (unauthorized port)\n", rx->dev->name,
|
978 |
|
|
print_mac(mac, hdr->addr2));
|
979 |
|
|
#endif /* CONFIG_MAC80211_DEBUG */
|
980 |
|
|
return TXRX_DROP;
|
981 |
|
|
}
|
982 |
|
|
|
983 |
|
|
return TXRX_CONTINUE;
|
984 |
|
|
}
|
985 |
|
|
|
986 |
|
|
static ieee80211_txrx_result
|
987 |
|
|
ieee80211_rx_h_drop_unencrypted(struct ieee80211_txrx_data *rx)
|
988 |
|
|
{
|
989 |
|
|
/*
|
990 |
|
|
* Pass through unencrypted frames if the hardware has
|
991 |
|
|
* decrypted them already.
|
992 |
|
|
*/
|
993 |
|
|
if (rx->u.rx.status->flag & RX_FLAG_DECRYPTED)
|
994 |
|
|
return TXRX_CONTINUE;
|
995 |
|
|
|
996 |
|
|
/* Drop unencrypted frames if key is set. */
|
997 |
|
|
if (unlikely(!(rx->fc & IEEE80211_FCTL_PROTECTED) &&
|
998 |
|
|
(rx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_DATA &&
|
999 |
|
|
(rx->fc & IEEE80211_FCTL_STYPE) != IEEE80211_STYPE_NULLFUNC &&
|
1000 |
|
|
(rx->key || rx->sdata->drop_unencrypted) &&
|
1001 |
|
|
(rx->sdata->eapol == 0 || !ieee80211_is_eapol(rx->skb)))) {
|
1002 |
|
|
if (net_ratelimit())
|
1003 |
|
|
printk(KERN_DEBUG "%s: RX non-WEP frame, but expected "
|
1004 |
|
|
"encryption\n", rx->dev->name);
|
1005 |
|
|
return TXRX_DROP;
|
1006 |
|
|
}
|
1007 |
|
|
return TXRX_CONTINUE;
|
1008 |
|
|
}
|
1009 |
|
|
|
1010 |
|
|
static ieee80211_txrx_result
|
1011 |
|
|
ieee80211_rx_h_data(struct ieee80211_txrx_data *rx)
|
1012 |
|
|
{
|
1013 |
|
|
struct net_device *dev = rx->dev;
|
1014 |
|
|
struct ieee80211_local *local = rx->local;
|
1015 |
|
|
struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) rx->skb->data;
|
1016 |
|
|
u16 fc, hdrlen, ethertype;
|
1017 |
|
|
u8 *payload;
|
1018 |
|
|
u8 dst[ETH_ALEN];
|
1019 |
|
|
u8 src[ETH_ALEN];
|
1020 |
|
|
struct sk_buff *skb = rx->skb, *skb2;
|
1021 |
|
|
struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
|
1022 |
|
|
DECLARE_MAC_BUF(mac);
|
1023 |
|
|
DECLARE_MAC_BUF(mac2);
|
1024 |
|
|
DECLARE_MAC_BUF(mac3);
|
1025 |
|
|
DECLARE_MAC_BUF(mac4);
|
1026 |
|
|
|
1027 |
|
|
fc = rx->fc;
|
1028 |
|
|
if (unlikely((fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_DATA))
|
1029 |
|
|
return TXRX_CONTINUE;
|
1030 |
|
|
|
1031 |
|
|
if (unlikely(!WLAN_FC_DATA_PRESENT(fc)))
|
1032 |
|
|
return TXRX_DROP;
|
1033 |
|
|
|
1034 |
|
|
hdrlen = ieee80211_get_hdrlen(fc);
|
1035 |
|
|
|
1036 |
|
|
/* convert IEEE 802.11 header + possible LLC headers into Ethernet
|
1037 |
|
|
* header
|
1038 |
|
|
* IEEE 802.11 address fields:
|
1039 |
|
|
* ToDS FromDS Addr1 Addr2 Addr3 Addr4
|
1040 |
|
|
* 0 0 DA SA BSSID n/a
|
1041 |
|
|
* 0 1 DA BSSID SA n/a
|
1042 |
|
|
* 1 0 BSSID SA DA n/a
|
1043 |
|
|
* 1 1 RA TA DA SA
|
1044 |
|
|
*/
|
1045 |
|
|
|
1046 |
|
|
switch (fc & (IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS)) {
|
1047 |
|
|
case IEEE80211_FCTL_TODS:
|
1048 |
|
|
/* BSSID SA DA */
|
1049 |
|
|
memcpy(dst, hdr->addr3, ETH_ALEN);
|
1050 |
|
|
memcpy(src, hdr->addr2, ETH_ALEN);
|
1051 |
|
|
|
1052 |
|
|
if (unlikely(sdata->type != IEEE80211_IF_TYPE_AP &&
|
1053 |
|
|
sdata->type != IEEE80211_IF_TYPE_VLAN)) {
|
1054 |
|
|
if (net_ratelimit())
|
1055 |
|
|
printk(KERN_DEBUG "%s: dropped ToDS frame "
|
1056 |
|
|
"(BSSID=%s SA=%s DA=%s)\n",
|
1057 |
|
|
dev->name,
|
1058 |
|
|
print_mac(mac, hdr->addr1),
|
1059 |
|
|
print_mac(mac2, hdr->addr2),
|
1060 |
|
|
print_mac(mac3, hdr->addr3));
|
1061 |
|
|
return TXRX_DROP;
|
1062 |
|
|
}
|
1063 |
|
|
break;
|
1064 |
|
|
case (IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS):
|
1065 |
|
|
/* RA TA DA SA */
|
1066 |
|
|
memcpy(dst, hdr->addr3, ETH_ALEN);
|
1067 |
|
|
memcpy(src, hdr->addr4, ETH_ALEN);
|
1068 |
|
|
|
1069 |
|
|
if (unlikely(sdata->type != IEEE80211_IF_TYPE_WDS)) {
|
1070 |
|
|
if (net_ratelimit())
|
1071 |
|
|
printk(KERN_DEBUG "%s: dropped FromDS&ToDS "
|
1072 |
|
|
"frame (RA=%s TA=%s DA=%s SA=%s)\n",
|
1073 |
|
|
rx->dev->name,
|
1074 |
|
|
print_mac(mac, hdr->addr1),
|
1075 |
|
|
print_mac(mac2, hdr->addr2),
|
1076 |
|
|
print_mac(mac3, hdr->addr3),
|
1077 |
|
|
print_mac(mac4, hdr->addr4));
|
1078 |
|
|
return TXRX_DROP;
|
1079 |
|
|
}
|
1080 |
|
|
break;
|
1081 |
|
|
case IEEE80211_FCTL_FROMDS:
|
1082 |
|
|
/* DA BSSID SA */
|
1083 |
|
|
memcpy(dst, hdr->addr1, ETH_ALEN);
|
1084 |
|
|
memcpy(src, hdr->addr3, ETH_ALEN);
|
1085 |
|
|
|
1086 |
|
|
if (sdata->type != IEEE80211_IF_TYPE_STA ||
|
1087 |
|
|
(is_multicast_ether_addr(dst) &&
|
1088 |
|
|
!compare_ether_addr(src, dev->dev_addr)))
|
1089 |
|
|
return TXRX_DROP;
|
1090 |
|
|
break;
|
1091 |
|
|
case 0:
|
1092 |
|
|
/* DA SA BSSID */
|
1093 |
|
|
memcpy(dst, hdr->addr1, ETH_ALEN);
|
1094 |
|
|
memcpy(src, hdr->addr2, ETH_ALEN);
|
1095 |
|
|
|
1096 |
|
|
if (sdata->type != IEEE80211_IF_TYPE_IBSS) {
|
1097 |
|
|
if (net_ratelimit()) {
|
1098 |
|
|
printk(KERN_DEBUG "%s: dropped IBSS frame "
|
1099 |
|
|
"(DA=%s SA=%s BSSID=%s)\n",
|
1100 |
|
|
dev->name,
|
1101 |
|
|
print_mac(mac, hdr->addr1),
|
1102 |
|
|
print_mac(mac2, hdr->addr2),
|
1103 |
|
|
print_mac(mac3, hdr->addr3));
|
1104 |
|
|
}
|
1105 |
|
|
return TXRX_DROP;
|
1106 |
|
|
}
|
1107 |
|
|
break;
|
1108 |
|
|
}
|
1109 |
|
|
|
1110 |
|
|
payload = skb->data + hdrlen;
|
1111 |
|
|
|
1112 |
|
|
if (unlikely(skb->len - hdrlen < 8)) {
|
1113 |
|
|
if (net_ratelimit()) {
|
1114 |
|
|
printk(KERN_DEBUG "%s: RX too short data frame "
|
1115 |
|
|
"payload\n", dev->name);
|
1116 |
|
|
}
|
1117 |
|
|
return TXRX_DROP;
|
1118 |
|
|
}
|
1119 |
|
|
|
1120 |
|
|
ethertype = (payload[6] << 8) | payload[7];
|
1121 |
|
|
|
1122 |
|
|
if (likely((compare_ether_addr(payload, rfc1042_header) == 0 &&
|
1123 |
|
|
ethertype != ETH_P_AARP && ethertype != ETH_P_IPX) ||
|
1124 |
|
|
compare_ether_addr(payload, bridge_tunnel_header) == 0)) {
|
1125 |
|
|
/* remove RFC1042 or Bridge-Tunnel encapsulation and
|
1126 |
|
|
* replace EtherType */
|
1127 |
|
|
skb_pull(skb, hdrlen + 6);
|
1128 |
|
|
memcpy(skb_push(skb, ETH_ALEN), src, ETH_ALEN);
|
1129 |
|
|
memcpy(skb_push(skb, ETH_ALEN), dst, ETH_ALEN);
|
1130 |
|
|
} else {
|
1131 |
|
|
struct ethhdr *ehdr;
|
1132 |
|
|
__be16 len;
|
1133 |
|
|
skb_pull(skb, hdrlen);
|
1134 |
|
|
len = htons(skb->len);
|
1135 |
|
|
ehdr = (struct ethhdr *) skb_push(skb, sizeof(struct ethhdr));
|
1136 |
|
|
memcpy(ehdr->h_dest, dst, ETH_ALEN);
|
1137 |
|
|
memcpy(ehdr->h_source, src, ETH_ALEN);
|
1138 |
|
|
ehdr->h_proto = len;
|
1139 |
|
|
}
|
1140 |
|
|
skb->dev = dev;
|
1141 |
|
|
|
1142 |
|
|
skb2 = NULL;
|
1143 |
|
|
|
1144 |
|
|
dev->stats.rx_packets++;
|
1145 |
|
|
dev->stats.rx_bytes += skb->len;
|
1146 |
|
|
|
1147 |
|
|
if (local->bridge_packets && (sdata->type == IEEE80211_IF_TYPE_AP
|
1148 |
|
|
|| sdata->type == IEEE80211_IF_TYPE_VLAN) &&
|
1149 |
|
|
(rx->flags & IEEE80211_TXRXD_RXRA_MATCH)) {
|
1150 |
|
|
if (is_multicast_ether_addr(skb->data)) {
|
1151 |
|
|
/* send multicast frames both to higher layers in
|
1152 |
|
|
* local net stack and back to the wireless media */
|
1153 |
|
|
skb2 = skb_copy(skb, GFP_ATOMIC);
|
1154 |
|
|
if (!skb2 && net_ratelimit())
|
1155 |
|
|
printk(KERN_DEBUG "%s: failed to clone "
|
1156 |
|
|
"multicast frame\n", dev->name);
|
1157 |
|
|
} else {
|
1158 |
|
|
struct sta_info *dsta;
|
1159 |
|
|
dsta = sta_info_get(local, skb->data);
|
1160 |
|
|
if (dsta && !dsta->dev) {
|
1161 |
|
|
if (net_ratelimit())
|
1162 |
|
|
printk(KERN_DEBUG "Station with null "
|
1163 |
|
|
"dev structure!\n");
|
1164 |
|
|
} else if (dsta && dsta->dev == dev) {
|
1165 |
|
|
/* Destination station is associated to this
|
1166 |
|
|
* AP, so send the frame directly to it and
|
1167 |
|
|
* do not pass the frame to local net stack.
|
1168 |
|
|
*/
|
1169 |
|
|
skb2 = skb;
|
1170 |
|
|
skb = NULL;
|
1171 |
|
|
}
|
1172 |
|
|
if (dsta)
|
1173 |
|
|
sta_info_put(dsta);
|
1174 |
|
|
}
|
1175 |
|
|
}
|
1176 |
|
|
|
1177 |
|
|
if (skb) {
|
1178 |
|
|
/* deliver to local stack */
|
1179 |
|
|
skb->protocol = eth_type_trans(skb, dev);
|
1180 |
|
|
memset(skb->cb, 0, sizeof(skb->cb));
|
1181 |
|
|
netif_rx(skb);
|
1182 |
|
|
}
|
1183 |
|
|
|
1184 |
|
|
if (skb2) {
|
1185 |
|
|
/* send to wireless media */
|
1186 |
|
|
skb2->protocol = __constant_htons(ETH_P_802_3);
|
1187 |
|
|
skb_set_network_header(skb2, 0);
|
1188 |
|
|
skb_set_mac_header(skb2, 0);
|
1189 |
|
|
dev_queue_xmit(skb2);
|
1190 |
|
|
}
|
1191 |
|
|
|
1192 |
|
|
return TXRX_QUEUED;
|
1193 |
|
|
}
|
1194 |
|
|
|
1195 |
|
|
static ieee80211_txrx_result
|
1196 |
|
|
ieee80211_rx_h_mgmt(struct ieee80211_txrx_data *rx)
|
1197 |
|
|
{
|
1198 |
|
|
struct ieee80211_sub_if_data *sdata;
|
1199 |
|
|
|
1200 |
|
|
if (!(rx->flags & IEEE80211_TXRXD_RXRA_MATCH))
|
1201 |
|
|
return TXRX_DROP;
|
1202 |
|
|
|
1203 |
|
|
sdata = IEEE80211_DEV_TO_SUB_IF(rx->dev);
|
1204 |
|
|
if ((sdata->type == IEEE80211_IF_TYPE_STA ||
|
1205 |
|
|
sdata->type == IEEE80211_IF_TYPE_IBSS) &&
|
1206 |
|
|
!(sdata->flags & IEEE80211_SDATA_USERSPACE_MLME))
|
1207 |
|
|
ieee80211_sta_rx_mgmt(rx->dev, rx->skb, rx->u.rx.status);
|
1208 |
|
|
else
|
1209 |
|
|
return TXRX_DROP;
|
1210 |
|
|
|
1211 |
|
|
return TXRX_QUEUED;
|
1212 |
|
|
}
|
1213 |
|
|
|
1214 |
|
|
static inline ieee80211_txrx_result __ieee80211_invoke_rx_handlers(
|
1215 |
|
|
struct ieee80211_local *local,
|
1216 |
|
|
ieee80211_rx_handler *handlers,
|
1217 |
|
|
struct ieee80211_txrx_data *rx,
|
1218 |
|
|
struct sta_info *sta)
|
1219 |
|
|
{
|
1220 |
|
|
ieee80211_rx_handler *handler;
|
1221 |
|
|
ieee80211_txrx_result res = TXRX_DROP;
|
1222 |
|
|
|
1223 |
|
|
for (handler = handlers; *handler != NULL; handler++) {
|
1224 |
|
|
res = (*handler)(rx);
|
1225 |
|
|
|
1226 |
|
|
switch (res) {
|
1227 |
|
|
case TXRX_CONTINUE:
|
1228 |
|
|
continue;
|
1229 |
|
|
case TXRX_DROP:
|
1230 |
|
|
I802_DEBUG_INC(local->rx_handlers_drop);
|
1231 |
|
|
if (sta)
|
1232 |
|
|
sta->rx_dropped++;
|
1233 |
|
|
break;
|
1234 |
|
|
case TXRX_QUEUED:
|
1235 |
|
|
I802_DEBUG_INC(local->rx_handlers_queued);
|
1236 |
|
|
break;
|
1237 |
|
|
}
|
1238 |
|
|
break;
|
1239 |
|
|
}
|
1240 |
|
|
|
1241 |
|
|
if (res == TXRX_DROP)
|
1242 |
|
|
dev_kfree_skb(rx->skb);
|
1243 |
|
|
return res;
|
1244 |
|
|
}
|
1245 |
|
|
|
1246 |
|
|
static inline void ieee80211_invoke_rx_handlers(struct ieee80211_local *local,
|
1247 |
|
|
ieee80211_rx_handler *handlers,
|
1248 |
|
|
struct ieee80211_txrx_data *rx,
|
1249 |
|
|
struct sta_info *sta)
|
1250 |
|
|
{
|
1251 |
|
|
if (__ieee80211_invoke_rx_handlers(local, handlers, rx, sta) ==
|
1252 |
|
|
TXRX_CONTINUE)
|
1253 |
|
|
dev_kfree_skb(rx->skb);
|
1254 |
|
|
}
|
1255 |
|
|
|
1256 |
|
|
static void ieee80211_rx_michael_mic_report(struct net_device *dev,
|
1257 |
|
|
struct ieee80211_hdr *hdr,
|
1258 |
|
|
struct sta_info *sta,
|
1259 |
|
|
struct ieee80211_txrx_data *rx)
|
1260 |
|
|
{
|
1261 |
|
|
int keyidx, hdrlen;
|
1262 |
|
|
DECLARE_MAC_BUF(mac);
|
1263 |
|
|
DECLARE_MAC_BUF(mac2);
|
1264 |
|
|
|
1265 |
|
|
hdrlen = ieee80211_get_hdrlen_from_skb(rx->skb);
|
1266 |
|
|
if (rx->skb->len >= hdrlen + 4)
|
1267 |
|
|
keyidx = rx->skb->data[hdrlen + 3] >> 6;
|
1268 |
|
|
else
|
1269 |
|
|
keyidx = -1;
|
1270 |
|
|
|
1271 |
|
|
if (net_ratelimit())
|
1272 |
|
|
printk(KERN_DEBUG "%s: TKIP hwaccel reported Michael MIC "
|
1273 |
|
|
"failure from %s to %s keyidx=%d\n",
|
1274 |
|
|
dev->name, print_mac(mac, hdr->addr2),
|
1275 |
|
|
print_mac(mac2, hdr->addr1), keyidx);
|
1276 |
|
|
|
1277 |
|
|
if (!sta) {
|
1278 |
|
|
/*
|
1279 |
|
|
* Some hardware seem to generate incorrect Michael MIC
|
1280 |
|
|
* reports; ignore them to avoid triggering countermeasures.
|
1281 |
|
|
*/
|
1282 |
|
|
if (net_ratelimit())
|
1283 |
|
|
printk(KERN_DEBUG "%s: ignored spurious Michael MIC "
|
1284 |
|
|
"error for unknown address %s\n",
|
1285 |
|
|
dev->name, print_mac(mac, hdr->addr2));
|
1286 |
|
|
goto ignore;
|
1287 |
|
|
}
|
1288 |
|
|
|
1289 |
|
|
if (!(rx->fc & IEEE80211_FCTL_PROTECTED)) {
|
1290 |
|
|
if (net_ratelimit())
|
1291 |
|
|
printk(KERN_DEBUG "%s: ignored spurious Michael MIC "
|
1292 |
|
|
"error for a frame with no PROTECTED flag (src "
|
1293 |
|
|
"%s)\n", dev->name, print_mac(mac, hdr->addr2));
|
1294 |
|
|
goto ignore;
|
1295 |
|
|
}
|
1296 |
|
|
|
1297 |
|
|
if (rx->sdata->type == IEEE80211_IF_TYPE_AP && keyidx) {
|
1298 |
|
|
/*
|
1299 |
|
|
* APs with pairwise keys should never receive Michael MIC
|
1300 |
|
|
* errors for non-zero keyidx because these are reserved for
|
1301 |
|
|
* group keys and only the AP is sending real multicast
|
1302 |
|
|
* frames in the BSS.
|
1303 |
|
|
*/
|
1304 |
|
|
if (net_ratelimit())
|
1305 |
|
|
printk(KERN_DEBUG "%s: ignored Michael MIC error for "
|
1306 |
|
|
"a frame with non-zero keyidx (%d)"
|
1307 |
|
|
" (src %s)\n", dev->name, keyidx,
|
1308 |
|
|
print_mac(mac, hdr->addr2));
|
1309 |
|
|
goto ignore;
|
1310 |
|
|
}
|
1311 |
|
|
|
1312 |
|
|
if ((rx->fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_DATA &&
|
1313 |
|
|
((rx->fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_MGMT ||
|
1314 |
|
|
(rx->fc & IEEE80211_FCTL_STYPE) != IEEE80211_STYPE_AUTH)) {
|
1315 |
|
|
if (net_ratelimit())
|
1316 |
|
|
printk(KERN_DEBUG "%s: ignored spurious Michael MIC "
|
1317 |
|
|
"error for a frame that cannot be encrypted "
|
1318 |
|
|
"(fc=0x%04x) (src %s)\n",
|
1319 |
|
|
dev->name, rx->fc, print_mac(mac, hdr->addr2));
|
1320 |
|
|
goto ignore;
|
1321 |
|
|
}
|
1322 |
|
|
|
1323 |
|
|
mac80211_ev_michael_mic_failure(rx->dev, keyidx, hdr);
|
1324 |
|
|
ignore:
|
1325 |
|
|
dev_kfree_skb(rx->skb);
|
1326 |
|
|
rx->skb = NULL;
|
1327 |
|
|
}
|
1328 |
|
|
|
1329 |
|
|
ieee80211_rx_handler ieee80211_rx_handlers[] =
|
1330 |
|
|
{
|
1331 |
|
|
ieee80211_rx_h_if_stats,
|
1332 |
|
|
ieee80211_rx_h_passive_scan,
|
1333 |
|
|
ieee80211_rx_h_check,
|
1334 |
|
|
ieee80211_rx_h_decrypt,
|
1335 |
|
|
ieee80211_rx_h_sta_process,
|
1336 |
|
|
ieee80211_rx_h_defragment,
|
1337 |
|
|
ieee80211_rx_h_ps_poll,
|
1338 |
|
|
ieee80211_rx_h_michael_mic_verify,
|
1339 |
|
|
/* this must be after decryption - so header is counted in MPDU mic
|
1340 |
|
|
* must be before pae and data, so QOS_DATA format frames
|
1341 |
|
|
* are not passed to user space by these functions
|
1342 |
|
|
*/
|
1343 |
|
|
ieee80211_rx_h_remove_qos_control,
|
1344 |
|
|
ieee80211_rx_h_802_1x_pae,
|
1345 |
|
|
ieee80211_rx_h_drop_unencrypted,
|
1346 |
|
|
ieee80211_rx_h_data,
|
1347 |
|
|
ieee80211_rx_h_mgmt,
|
1348 |
|
|
NULL
|
1349 |
|
|
};
|
1350 |
|
|
|
1351 |
|
|
/* main receive path */
|
1352 |
|
|
|
1353 |
|
|
static int prepare_for_handlers(struct ieee80211_sub_if_data *sdata,
|
1354 |
|
|
u8 *bssid, struct ieee80211_txrx_data *rx,
|
1355 |
|
|
struct ieee80211_hdr *hdr)
|
1356 |
|
|
{
|
1357 |
|
|
int multicast = is_multicast_ether_addr(hdr->addr1);
|
1358 |
|
|
|
1359 |
|
|
switch (sdata->type) {
|
1360 |
|
|
case IEEE80211_IF_TYPE_STA:
|
1361 |
|
|
if (!bssid)
|
1362 |
|
|
return 0;
|
1363 |
|
|
if (!ieee80211_bssid_match(bssid, sdata->u.sta.bssid)) {
|
1364 |
|
|
if (!(rx->flags & IEEE80211_TXRXD_RXIN_SCAN))
|
1365 |
|
|
return 0;
|
1366 |
|
|
rx->flags &= ~IEEE80211_TXRXD_RXRA_MATCH;
|
1367 |
|
|
} else if (!multicast &&
|
1368 |
|
|
compare_ether_addr(sdata->dev->dev_addr,
|
1369 |
|
|
hdr->addr1) != 0) {
|
1370 |
|
|
if (!(sdata->dev->flags & IFF_PROMISC))
|
1371 |
|
|
return 0;
|
1372 |
|
|
rx->flags &= ~IEEE80211_TXRXD_RXRA_MATCH;
|
1373 |
|
|
}
|
1374 |
|
|
break;
|
1375 |
|
|
case IEEE80211_IF_TYPE_IBSS:
|
1376 |
|
|
if (!bssid)
|
1377 |
|
|
return 0;
|
1378 |
|
|
if (!ieee80211_bssid_match(bssid, sdata->u.sta.bssid)) {
|
1379 |
|
|
if (!(rx->flags & IEEE80211_TXRXD_RXIN_SCAN))
|
1380 |
|
|
return 0;
|
1381 |
|
|
rx->flags &= ~IEEE80211_TXRXD_RXRA_MATCH;
|
1382 |
|
|
} else if (!multicast &&
|
1383 |
|
|
compare_ether_addr(sdata->dev->dev_addr,
|
1384 |
|
|
hdr->addr1) != 0) {
|
1385 |
|
|
if (!(sdata->dev->flags & IFF_PROMISC))
|
1386 |
|
|
return 0;
|
1387 |
|
|
rx->flags &= ~IEEE80211_TXRXD_RXRA_MATCH;
|
1388 |
|
|
} else if (!rx->sta)
|
1389 |
|
|
rx->sta = ieee80211_ibss_add_sta(sdata->dev, rx->skb,
|
1390 |
|
|
bssid, hdr->addr2);
|
1391 |
|
|
break;
|
1392 |
|
|
case IEEE80211_IF_TYPE_VLAN:
|
1393 |
|
|
case IEEE80211_IF_TYPE_AP:
|
1394 |
|
|
if (!bssid) {
|
1395 |
|
|
if (compare_ether_addr(sdata->dev->dev_addr,
|
1396 |
|
|
hdr->addr1))
|
1397 |
|
|
return 0;
|
1398 |
|
|
} else if (!ieee80211_bssid_match(bssid,
|
1399 |
|
|
sdata->dev->dev_addr)) {
|
1400 |
|
|
if (!(rx->flags & IEEE80211_TXRXD_RXIN_SCAN))
|
1401 |
|
|
return 0;
|
1402 |
|
|
rx->flags &= ~IEEE80211_TXRXD_RXRA_MATCH;
|
1403 |
|
|
}
|
1404 |
|
|
if (sdata->dev == sdata->local->mdev &&
|
1405 |
|
|
!(rx->flags & IEEE80211_TXRXD_RXIN_SCAN))
|
1406 |
|
|
/* do not receive anything via
|
1407 |
|
|
* master device when not scanning */
|
1408 |
|
|
return 0;
|
1409 |
|
|
break;
|
1410 |
|
|
case IEEE80211_IF_TYPE_WDS:
|
1411 |
|
|
if (bssid ||
|
1412 |
|
|
(rx->fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_DATA)
|
1413 |
|
|
return 0;
|
1414 |
|
|
if (compare_ether_addr(sdata->u.wds.remote_addr, hdr->addr2))
|
1415 |
|
|
return 0;
|
1416 |
|
|
break;
|
1417 |
|
|
case IEEE80211_IF_TYPE_MNTR:
|
1418 |
|
|
/* take everything */
|
1419 |
|
|
break;
|
1420 |
|
|
case IEEE80211_IF_TYPE_INVALID:
|
1421 |
|
|
/* should never get here */
|
1422 |
|
|
WARN_ON(1);
|
1423 |
|
|
break;
|
1424 |
|
|
}
|
1425 |
|
|
|
1426 |
|
|
return 1;
|
1427 |
|
|
}
|
1428 |
|
|
|
1429 |
|
|
/*
|
1430 |
|
|
* This is the receive path handler. It is called by a low level driver when an
|
1431 |
|
|
* 802.11 MPDU is received from the hardware.
|
1432 |
|
|
*/
|
1433 |
|
|
void __ieee80211_rx(struct ieee80211_hw *hw, struct sk_buff *skb,
|
1434 |
|
|
struct ieee80211_rx_status *status)
|
1435 |
|
|
{
|
1436 |
|
|
struct ieee80211_local *local = hw_to_local(hw);
|
1437 |
|
|
struct ieee80211_sub_if_data *sdata;
|
1438 |
|
|
struct sta_info *sta;
|
1439 |
|
|
struct ieee80211_hdr *hdr;
|
1440 |
|
|
struct ieee80211_txrx_data rx;
|
1441 |
|
|
u16 type;
|
1442 |
|
|
int prepres;
|
1443 |
|
|
struct ieee80211_sub_if_data *prev = NULL;
|
1444 |
|
|
struct sk_buff *skb_new;
|
1445 |
|
|
u8 *bssid;
|
1446 |
|
|
|
1447 |
|
|
/*
|
1448 |
|
|
* key references and virtual interfaces are protected using RCU
|
1449 |
|
|
* and this requires that we are in a read-side RCU section during
|
1450 |
|
|
* receive processing
|
1451 |
|
|
*/
|
1452 |
|
|
rcu_read_lock();
|
1453 |
|
|
|
1454 |
|
|
/*
|
1455 |
|
|
* Frames with failed FCS/PLCP checksum are not returned,
|
1456 |
|
|
* all other frames are returned without radiotap header
|
1457 |
|
|
* if it was previously present.
|
1458 |
|
|
* Also, frames with less than 16 bytes are dropped.
|
1459 |
|
|
*/
|
1460 |
|
|
skb = ieee80211_rx_monitor(local, skb, status);
|
1461 |
|
|
if (!skb) {
|
1462 |
|
|
rcu_read_unlock();
|
1463 |
|
|
return;
|
1464 |
|
|
}
|
1465 |
|
|
|
1466 |
|
|
hdr = (struct ieee80211_hdr *) skb->data;
|
1467 |
|
|
memset(&rx, 0, sizeof(rx));
|
1468 |
|
|
rx.skb = skb;
|
1469 |
|
|
rx.local = local;
|
1470 |
|
|
|
1471 |
|
|
rx.u.rx.status = status;
|
1472 |
|
|
rx.fc = le16_to_cpu(hdr->frame_control);
|
1473 |
|
|
type = rx.fc & IEEE80211_FCTL_FTYPE;
|
1474 |
|
|
|
1475 |
|
|
if (type == IEEE80211_FTYPE_DATA || type == IEEE80211_FTYPE_MGMT)
|
1476 |
|
|
local->dot11ReceivedFragmentCount++;
|
1477 |
|
|
|
1478 |
|
|
sta = rx.sta = sta_info_get(local, hdr->addr2);
|
1479 |
|
|
if (sta) {
|
1480 |
|
|
rx.dev = rx.sta->dev;
|
1481 |
|
|
rx.sdata = IEEE80211_DEV_TO_SUB_IF(rx.dev);
|
1482 |
|
|
}
|
1483 |
|
|
|
1484 |
|
|
if ((status->flag & RX_FLAG_MMIC_ERROR)) {
|
1485 |
|
|
ieee80211_rx_michael_mic_report(local->mdev, hdr, sta, &rx);
|
1486 |
|
|
goto end;
|
1487 |
|
|
}
|
1488 |
|
|
|
1489 |
|
|
if (unlikely(local->sta_scanning))
|
1490 |
|
|
rx.flags |= IEEE80211_TXRXD_RXIN_SCAN;
|
1491 |
|
|
|
1492 |
|
|
if (__ieee80211_invoke_rx_handlers(local, local->rx_pre_handlers, &rx,
|
1493 |
|
|
sta) != TXRX_CONTINUE)
|
1494 |
|
|
goto end;
|
1495 |
|
|
skb = rx.skb;
|
1496 |
|
|
|
1497 |
|
|
if (sta && !(sta->flags & (WLAN_STA_WDS | WLAN_STA_ASSOC_AP)) &&
|
1498 |
|
|
!atomic_read(&local->iff_promiscs) &&
|
1499 |
|
|
!is_multicast_ether_addr(hdr->addr1)) {
|
1500 |
|
|
rx.flags |= IEEE80211_TXRXD_RXRA_MATCH;
|
1501 |
|
|
ieee80211_invoke_rx_handlers(local, local->rx_handlers, &rx,
|
1502 |
|
|
rx.sta);
|
1503 |
|
|
sta_info_put(sta);
|
1504 |
|
|
rcu_read_unlock();
|
1505 |
|
|
return;
|
1506 |
|
|
}
|
1507 |
|
|
|
1508 |
|
|
bssid = ieee80211_get_bssid(hdr, skb->len);
|
1509 |
|
|
|
1510 |
|
|
list_for_each_entry_rcu(sdata, &local->interfaces, list) {
|
1511 |
|
|
if (!netif_running(sdata->dev))
|
1512 |
|
|
continue;
|
1513 |
|
|
|
1514 |
|
|
if (sdata->type == IEEE80211_IF_TYPE_MNTR)
|
1515 |
|
|
continue;
|
1516 |
|
|
|
1517 |
|
|
rx.flags |= IEEE80211_TXRXD_RXRA_MATCH;
|
1518 |
|
|
prepres = prepare_for_handlers(sdata, bssid, &rx, hdr);
|
1519 |
|
|
/* prepare_for_handlers can change sta */
|
1520 |
|
|
sta = rx.sta;
|
1521 |
|
|
|
1522 |
|
|
if (!prepres)
|
1523 |
|
|
continue;
|
1524 |
|
|
|
1525 |
|
|
/*
|
1526 |
|
|
* frame is destined for this interface, but if it's not
|
1527 |
|
|
* also for the previous one we handle that after the
|
1528 |
|
|
* loop to avoid copying the SKB once too much
|
1529 |
|
|
*/
|
1530 |
|
|
|
1531 |
|
|
if (!prev) {
|
1532 |
|
|
prev = sdata;
|
1533 |
|
|
continue;
|
1534 |
|
|
}
|
1535 |
|
|
|
1536 |
|
|
/*
|
1537 |
|
|
* frame was destined for the previous interface
|
1538 |
|
|
* so invoke RX handlers for it
|
1539 |
|
|
*/
|
1540 |
|
|
|
1541 |
|
|
skb_new = skb_copy(skb, GFP_ATOMIC);
|
1542 |
|
|
if (!skb_new) {
|
1543 |
|
|
if (net_ratelimit())
|
1544 |
|
|
printk(KERN_DEBUG "%s: failed to copy "
|
1545 |
|
|
"multicast frame for %s",
|
1546 |
|
|
wiphy_name(local->hw.wiphy),
|
1547 |
|
|
prev->dev->name);
|
1548 |
|
|
continue;
|
1549 |
|
|
}
|
1550 |
|
|
rx.skb = skb_new;
|
1551 |
|
|
rx.dev = prev->dev;
|
1552 |
|
|
rx.sdata = prev;
|
1553 |
|
|
ieee80211_invoke_rx_handlers(local, local->rx_handlers,
|
1554 |
|
|
&rx, sta);
|
1555 |
|
|
prev = sdata;
|
1556 |
|
|
}
|
1557 |
|
|
if (prev) {
|
1558 |
|
|
rx.skb = skb;
|
1559 |
|
|
rx.dev = prev->dev;
|
1560 |
|
|
rx.sdata = prev;
|
1561 |
|
|
ieee80211_invoke_rx_handlers(local, local->rx_handlers,
|
1562 |
|
|
&rx, sta);
|
1563 |
|
|
} else
|
1564 |
|
|
dev_kfree_skb(skb);
|
1565 |
|
|
|
1566 |
|
|
end:
|
1567 |
|
|
rcu_read_unlock();
|
1568 |
|
|
|
1569 |
|
|
if (sta)
|
1570 |
|
|
sta_info_put(sta);
|
1571 |
|
|
}
|
1572 |
|
|
EXPORT_SYMBOL(__ieee80211_rx);
|
1573 |
|
|
|
1574 |
|
|
/* This is a version of the rx handler that can be called from hard irq
|
1575 |
|
|
* context. Post the skb on the queue and schedule the tasklet */
|
1576 |
|
|
void ieee80211_rx_irqsafe(struct ieee80211_hw *hw, struct sk_buff *skb,
|
1577 |
|
|
struct ieee80211_rx_status *status)
|
1578 |
|
|
{
|
1579 |
|
|
struct ieee80211_local *local = hw_to_local(hw);
|
1580 |
|
|
|
1581 |
|
|
BUILD_BUG_ON(sizeof(struct ieee80211_rx_status) > sizeof(skb->cb));
|
1582 |
|
|
|
1583 |
|
|
skb->dev = local->mdev;
|
1584 |
|
|
/* copy status into skb->cb for use by tasklet */
|
1585 |
|
|
memcpy(skb->cb, status, sizeof(*status));
|
1586 |
|
|
skb->pkt_type = IEEE80211_RX_MSG;
|
1587 |
|
|
skb_queue_tail(&local->skb_queue, skb);
|
1588 |
|
|
tasklet_schedule(&local->tasklet);
|
1589 |
|
|
}
|
1590 |
|
|
EXPORT_SYMBOL(ieee80211_rx_irqsafe);
|