From 293702a3fb75832613e2af097bdc3ac8ef775b33 Mon Sep 17 00:00:00 2001 From: Johannes Berg Date: Fri, 2 Mar 2012 13:18:19 +0100 Subject: [PATCH] mac80211: use common radiotap code for cooked monitors There's no need to hardcode a subset of the radiotap header for cooked monitor receive, we can just reuse the normal monitor mode radiotap code. This simplifies the code and extends the information available on cooked monitor interfaces. Signed-off-by: Johannes Berg Signed-off-by: John W. Linville --- net/mac80211/rx.c | 39 +++++++++------------------------------ 1 file changed, 9 insertions(+), 30 deletions(-) diff --git a/net/mac80211/rx.c b/net/mac80211/rx.c index c8166adcd600..10bbbd33b314 100644 --- a/net/mac80211/rx.c +++ b/net/mac80211/rx.c @@ -228,7 +228,7 @@ ieee80211_rx_monitor(struct ieee80211_local *local, struct sk_buff *origskb, { struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(origskb); struct ieee80211_sub_if_data *sdata; - int needed_headroom = 0; + int needed_headroom; struct sk_buff *skb, *skb2; struct net_device *prev_dev = NULL; int present_fcs_len = 0; @@ -2544,16 +2544,10 @@ static void ieee80211_rx_cooked_monitor(struct ieee80211_rx_data *rx, { struct ieee80211_sub_if_data *sdata; struct ieee80211_local *local = rx->local; - struct ieee80211_rtap_hdr { - struct ieee80211_radiotap_header hdr; - u8 flags; - u8 rate_or_pad; - __le16 chan_freq; - __le16 chan_flags; - } __packed *rthdr; struct sk_buff *skb = rx->skb, *skb2; struct net_device *prev_dev = NULL; struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb); + int needed_headroom; /* * If cooked monitor has been processed already, then @@ -2567,30 +2561,15 @@ static void ieee80211_rx_cooked_monitor(struct ieee80211_rx_data *rx, if (!local->cooked_mntrs) goto out_free_skb; - if (skb_headroom(skb) < sizeof(*rthdr) && - pskb_expand_head(skb, sizeof(*rthdr), 0, GFP_ATOMIC)) - goto out_free_skb; - - 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 = - cpu_to_le32((1 << IEEE80211_RADIOTAP_FLAGS) | - (1 << IEEE80211_RADIOTAP_CHANNEL)); + /* room for the radiotap header based on driver features */ + needed_headroom = ieee80211_rx_radiotap_len(local, status); - if (rate) { - rthdr->rate_or_pad = rate->bitrate / 5; - rthdr->hdr.it_present |= - cpu_to_le32(1 << IEEE80211_RADIOTAP_RATE); - } - rthdr->chan_freq = cpu_to_le16(status->freq); + if (skb_headroom(skb) < needed_headroom && + pskb_expand_head(skb, needed_headroom, 0, GFP_ATOMIC)) + goto out_free_skb; - if (status->band == IEEE80211_BAND_5GHZ) - rthdr->chan_flags = cpu_to_le16(IEEE80211_CHAN_OFDM | - IEEE80211_CHAN_5GHZ); - else - rthdr->chan_flags = cpu_to_le16(IEEE80211_CHAN_DYN | - IEEE80211_CHAN_2GHZ); + /* prepend radiotap information */ + ieee80211_add_rx_radiotap_header(local, skb, rate, needed_headroom); skb_set_mac_header(skb, 0); skb->ip_summed = CHECKSUM_UNNECESSARY; -- 2.20.1