diff options
| author | Johannes Berg <johannes@sipsolutions.net> | 2007-09-17 01:29:22 -0400 |
|---|---|---|
| committer | David S. Miller <davem@sunset.davemloft.net> | 2007-10-10 16:52:28 -0700 |
| commit | 72abd81b980ef7ffb83ecb4ac4a7627d9d575f50 (patch) | |
| tree | 82bed7bb728c862bce54883102703d5aea1a8f8f /net | |
| parent | ac630c2b1933e79ff32e3653ae656620cf4b4c79 (diff) | |
[MAC80211]: allow drivers to indicate failed FCS/PLCP checksum
This patch allows drivers to indicate bad FCS/PLCP CRC to the stack and
have the stack drop packets like that except for monitor interfaces.
Signed-off-by: Johannes Berg <johannes@sipsolutions.net>
Signed-off-by: Michael Wu <flamingice@sourmilk.net>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net')
| -rw-r--r-- | net/mac80211/rx.c | 32 |
1 files changed, 29 insertions, 3 deletions
diff --git a/net/mac80211/rx.c b/net/mac80211/rx.c index e9dcc6229c3..cf2a72f89d6 100644 --- a/net/mac80211/rx.c +++ b/net/mac80211/rx.c @@ -145,6 +145,8 @@ ieee80211_rx_monitor(struct net_device *dev, struct sk_buff *skb, __le16 chan_freq; __le16 chan_flags; u8 antsignal; + u8 padding_for_rxflags; + __le16 rx_flags; } __attribute__ ((packed)) *rthdr; skb->dev = dev; @@ -167,12 +169,21 @@ ieee80211_rx_monitor(struct net_device *dev, struct sk_buff *skb, cpu_to_le32((1 << IEEE80211_RADIOTAP_FLAGS) | (1 << IEEE80211_RADIOTAP_RATE) | (1 << IEEE80211_RADIOTAP_CHANNEL) | - (1 << IEEE80211_RADIOTAP_DB_ANTSIGNAL)); + (1 << IEEE80211_RADIOTAP_DB_ANTSIGNAL) | + (1 << IEEE80211_RADIOTAP_RX_FLAGS)); rthdr->flags = local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS ? IEEE80211_RADIOTAP_F_FCS : 0; + + /* FIXME: when radiotap gets a 'bad PLCP' flag use it here */ + rthdr->rx_flags = 0; + if (status->flag & + (RX_FLAG_FAILED_FCS_CRC | RX_FLAG_FAILED_PLCP_CRC)) + rthdr->rx_flags |= cpu_to_le16(IEEE80211_RADIOTAP_F_RX_BADFCS); + rate = ieee80211_get_rate(local, status->phymode, status->rate); if (rate) rthdr->rate = rate->rate / 5; + rthdr->chan_freq = cpu_to_le16(status->freq); rthdr->chan_flags = status->phymode == MODE_IEEE80211A ? @@ -200,6 +211,15 @@ ieee80211_rx_h_monitor(struct ieee80211_txrx_data *rx) return TXRX_QUEUED; } + /* + * Drop frames with failed FCS/PLCP checksums here, they are only + * relevant for monitor mode, the rest of the stack should never + * see them. + */ + if (rx->u.rx.status->flag & + (RX_FLAG_FAILED_FCS_CRC | RX_FLAG_FAILED_PLCP_CRC)) + return TXRX_DROP; + if (rx->u.rx.status->flag & RX_FLAG_RADIOTAP) skb_pull(rx->skb, ieee80211_get_radiotap_len(rx->skb->data)); @@ -1360,6 +1380,7 @@ void __ieee80211_rx(struct ieee80211_hw *hw, struct sk_buff *skb, struct ieee80211_sub_if_data *prev = NULL; struct sk_buff *skb_new; u8 *bssid; + int bogon; if (status->flag & RX_FLAG_RADIOTAP) { radiotap_len = ieee80211_get_radiotap_len(skb->data); @@ -1380,10 +1401,15 @@ void __ieee80211_rx(struct ieee80211_hw *hw, struct sk_buff *skb, rx.u.rx.status = status; rx.fc = skb->len >= 2 ? le16_to_cpu(hdr->frame_control) : 0; type = rx.fc & IEEE80211_FCTL_FTYPE; - if (type == IEEE80211_FTYPE_DATA || type == IEEE80211_FTYPE_MGMT) + + bogon = status->flag & (RX_FLAG_FAILED_FCS_CRC | + RX_FLAG_FAILED_PLCP_CRC); + + if (!bogon && (type == IEEE80211_FTYPE_DATA || + type == IEEE80211_FTYPE_MGMT)) local->dot11ReceivedFragmentCount++; - if (skb->len >= 16) { + if (!bogon && skb->len >= 16) { sta = rx.sta = sta_info_get(local, hdr->addr2); if (sta) { rx.dev = rx.sta->dev; |