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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 <johannes@sipsolutions.net>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Johannes Berg 2007-12-11 21:33:42 +01:00 committed by David S. Miller
parent a07a5a86d0
commit c49e5ea322
2 changed files with 35 additions and 16 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

3
include/net/mac80211.h
View File

@ -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,
};
/**

48
net/mac80211/rx.c
View File

@ -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);