Gitweb:
http://git.kernel.org/git/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=c49e5ea322c2fb43f430abb3c4a49eae1394287e
Commit: c49e5ea322c2fb43f430abb3c4a49eae1394287e
Parent: a07a5a86d091699fd5e791765b8a79e6b1ef96cb
Author: Johannes Berg <[EMAIL PROTECTED]>
AuthorDate: Tue Dec 11 21:33:42 2007 +0100
Committer: David S. Miller <[EMAIL PROTECTED]>
CommitDate: Mon Jan 28 14:58:25 2008 -0800
mac80211: conditionally include timestamp in radiotap information
This makes mac80211 include the low-level MAC timestamp
in the radiotap header if the driver indicated (by a new
RX flag) that the timestamp is valid.
Signed-off-by: Johannes Berg <[EMAIL PROTECTED]>
Signed-off-by: John W. Linville <[EMAIL PROTECTED]>
Signed-off-by: David S. Miller <[EMAIL PROTECTED]>
---
include/net/mac80211.h | 3 +++
net/mac80211/rx.c | 48 ++++++++++++++++++++++++++++++++----------------
2 files changed, 35 insertions(+), 16 deletions(-)
diff --git a/include/net/mac80211.h b/include/net/mac80211.h
index 0d67b33..3bd970f 100644
--- a/include/net/mac80211.h
+++ b/include/net/mac80211.h
@@ -350,6 +350,8 @@ struct ieee80211_tx_control {
* the frame.
* @RX_FLAG_FAILED_PLCP_CRC: Set this flag if the PCLP check failed on
* the frame.
+ * @RX_FLAG_TSFT: The timestamp passed in the RX status (@mactime field)
+ * is valid.
*/
enum mac80211_rx_flags {
RX_FLAG_MMIC_ERROR = 1<<0,
@@ -359,6 +361,7 @@ enum mac80211_rx_flags {
RX_FLAG_IV_STRIPPED = 1<<4,
RX_FLAG_FAILED_FCS_CRC = 1<<5,
RX_FLAG_FAILED_PLCP_CRC = 1<<6,
+ RX_FLAG_TSFT = 1<<7,
};
/**
diff --git a/net/mac80211/rx.c b/net/mac80211/rx.c
index c542fc1..9cd59ec 100644
--- a/net/mac80211/rx.c
+++ b/net/mac80211/rx.c
@@ -79,8 +79,9 @@ ieee80211_rx_monitor(struct ieee80211_local *local, struct
sk_buff *origskb,
struct ieee80211_sub_if_data *sdata;
struct ieee80211_rate *rate;
int needed_headroom = 0;
- struct ieee80211_rtap_hdr {
- struct ieee80211_radiotap_header hdr;
+ struct ieee80211_radiotap_header *rthdr;
+ __le64 *rttsft = NULL;
+ struct ieee80211_rtap_fixed_data {
u8 flags;
u8 rate;
__le16 chan_freq;
@@ -88,7 +89,7 @@ ieee80211_rx_monitor(struct ieee80211_local *local, struct
sk_buff *origskb,
u8 antsignal;
u8 padding_for_rxflags;
__le16 rx_flags;
- } __attribute__ ((packed)) *rthdr;
+ } __attribute__ ((packed)) *rtfixed;
struct sk_buff *skb, *skb2;
struct net_device *prev_dev = NULL;
int present_fcs_len = 0;
@@ -105,7 +106,8 @@ ieee80211_rx_monitor(struct ieee80211_local *local, struct
sk_buff *origskb,
if (status->flag & RX_FLAG_RADIOTAP)
rtap_len = ieee80211_get_radiotap_len(origskb->data);
else
- needed_headroom = sizeof(*rthdr);
+ /* room for radiotap header, always present fields and TSFT */
+ needed_headroom = sizeof(*rthdr) + sizeof(*rtfixed) + 8;
if (local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS)
present_fcs_len = FCS_LEN;
@@ -133,7 +135,7 @@ ieee80211_rx_monitor(struct ieee80211_local *local, struct
sk_buff *origskb,
* them allocate enough headroom to start with.
*/
if (skb_headroom(skb) < needed_headroom &&
- pskb_expand_head(skb, sizeof(*rthdr), 0, GFP_ATOMIC)) {
+ pskb_expand_head(skb, needed_headroom, 0, GFP_ATOMIC)) {
dev_kfree_skb(skb);
return NULL;
}
@@ -152,42 +154,56 @@ ieee80211_rx_monitor(struct ieee80211_local *local,
struct sk_buff *origskb,
/* if necessary, prepend radiotap information */
if (!(status->flag & RX_FLAG_RADIOTAP)) {
+ rtfixed = (void *) skb_push(skb, sizeof(*rtfixed));
+ rtap_len = sizeof(*rthdr) + sizeof(*rtfixed);
+ if (status->flag & RX_FLAG_TSFT) {
+ rttsft = (void *) skb_push(skb, sizeof(*rttsft));
+ rtap_len += 8;
+ }
rthdr = (void *) skb_push(skb, sizeof(*rthdr));
memset(rthdr, 0, sizeof(*rthdr));
- rthdr->hdr.it_len = cpu_to_le16(sizeof(*rthdr));
- rthdr->hdr.it_present =
+ memset(rtfixed, 0, sizeof(*rtfixed));
+ rthdr->it_present =
cpu_to_le32((1 << IEEE80211_RADIOTAP_FLAGS) |
(1 << IEEE80211_RADIOTAP_RATE) |
(1 << IEEE80211_RADIOTAP_CHANNEL) |
(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;
+ rtfixed->flags = 0;
+ if (local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS)
+ rtfixed->flags |= IEEE80211_RADIOTAP_F_FCS;
+
+ if (rttsft) {
+ *rttsft = cpu_to_le64(status->mactime);
+ rthdr->it_present |=
+ cpu_to_le32(1 << IEEE80211_RADIOTAP_TSFT);
+ }
/* FIXME: when radiotap gets a 'bad PLCP' flag use it here */
- rthdr->rx_flags = 0;
+ rtfixed->rx_flags = 0;
if (status->flag &
(RX_FLAG_FAILED_FCS_CRC | RX_FLAG_FAILED_PLCP_CRC))
- rthdr->rx_flags |=
+ rtfixed->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;
+ rtfixed->rate = rate->rate / 5;
- rthdr->chan_freq = cpu_to_le16(status->freq);
+ rtfixed->chan_freq = cpu_to_le16(status->freq);
if (status->phymode == MODE_IEEE80211A)
- rthdr->chan_flags =
+ rtfixed->chan_flags =
cpu_to_le16(IEEE80211_CHAN_OFDM |
IEEE80211_CHAN_5GHZ);
else
- rthdr->chan_flags =
+ rtfixed->chan_flags =
cpu_to_le16(IEEE80211_CHAN_DYN |
IEEE80211_CHAN_2GHZ);
- rthdr->antsignal = status->ssi;
+ rtfixed->antsignal = status->ssi;
+ rthdr->it_len = cpu_to_le16(rtap_len);
}
skb_set_mac_header(skb, 0);
-
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