From: Johannes Berg <johannes@sipsolutions.net>
To: John Linville <linville@tuxdriver.com>
Cc: linux-wireless@vger.kernel.org
Subject: [PATCH 4/4] mac80211: parse radiotap header earlier
Date: Fri, 07 Oct 2011 14:01:26 +0200 [thread overview]
Message-ID: <20111007120217.591455761@sipsolutions.net> (raw)
In-Reply-To: 20111007120122.982757001@sipsolutions.net
From: Johannes Berg <johannes.berg@intel.com>
We can now move the radiotap header parsing into
ieee80211_monitor_start_xmit(). This moves it out of
the hotpath, and also helps the code since now the
radiotap header will no longer be present in
ieee80211_xmit() etc. which is easier to understand.
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
---
include/net/mac80211.h | 4
net/mac80211/tx.c | 201 +++++++++++++++++++++----------------------------
2 files changed, 89 insertions(+), 116 deletions(-)
--- a/net/mac80211/tx.c 2011-10-07 11:05:26.000000000 +0200
+++ b/net/mac80211/tx.c 2011-10-07 11:11:52.000000000 +0200
@@ -1035,103 +1035,6 @@ ieee80211_tx_h_calculate_duration(struct
/* actual transmit path */
-/*
- * deal with packet injection down monitor interface
- * with Radiotap Header -- only called for monitor mode interface
- */
-static bool __ieee80211_parse_tx_radiotap(struct ieee80211_tx_data *tx,
- struct sk_buff *skb)
-{
- /*
- * this is the moment to interpret and discard the radiotap header that
- * must be at the start of the packet injected in Monitor mode
- *
- * Need to take some care with endian-ness since radiotap
- * args are little-endian
- */
-
- struct ieee80211_radiotap_iterator iterator;
- struct ieee80211_radiotap_header *rthdr =
- (struct ieee80211_radiotap_header *) skb->data;
- struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
- int ret = ieee80211_radiotap_iterator_init(&iterator, rthdr, skb->len,
- NULL);
- u16 txflags;
-
- info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT |
- IEEE80211_TX_CTL_DONTFRAG;
-
- /*
- * for every radiotap entry that is present
- * (ieee80211_radiotap_iterator_next returns -ENOENT when no more
- * entries present, or -EINVAL on error)
- */
-
- while (!ret) {
- ret = ieee80211_radiotap_iterator_next(&iterator);
-
- if (ret)
- continue;
-
- /* see if this argument is something we can use */
- switch (iterator.this_arg_index) {
- /*
- * You must take care when dereferencing iterator.this_arg
- * for multibyte types... the pointer is not aligned. Use
- * get_unaligned((type *)iterator.this_arg) to dereference
- * iterator.this_arg for type "type" safely on all arches.
- */
- case IEEE80211_RADIOTAP_FLAGS:
- if (*iterator.this_arg & IEEE80211_RADIOTAP_F_FCS) {
- /*
- * this indicates that the skb we have been
- * handed has the 32-bit FCS CRC at the end...
- * we should react to that by snipping it off
- * because it will be recomputed and added
- * on transmission
- */
- if (skb->len < (iterator._max_length + FCS_LEN))
- return false;
-
- skb_trim(skb, skb->len - FCS_LEN);
- }
- if (*iterator.this_arg & IEEE80211_RADIOTAP_F_WEP)
- info->flags &= ~IEEE80211_TX_INTFL_DONT_ENCRYPT;
- if (*iterator.this_arg & IEEE80211_RADIOTAP_F_FRAG)
- info->flags &= ~IEEE80211_TX_CTL_DONTFRAG;
- break;
-
- case IEEE80211_RADIOTAP_TX_FLAGS:
- txflags = le16_to_cpu(get_unaligned((__le16*)
- iterator.this_arg));
- if (txflags & IEEE80211_RADIOTAP_F_TX_NOACK)
- info->flags |= IEEE80211_TX_CTL_NO_ACK;
- break;
-
- /*
- * Please update the file
- * Documentation/networking/mac80211-injection.txt
- * when parsing new fields here.
- */
-
- default:
- break;
- }
- }
-
- if (ret != -ENOENT) /* ie, if we didn't simply run out of fields */
- return false;
-
- /*
- * remove the radiotap header
- * iterator->_max_length was sanity-checked against
- * skb->len by iterator init
- */
- skb_pull(skb, iterator._max_length);
-
- return true;
-}
-
static bool ieee80211_tx_prep_agg(struct ieee80211_tx_data *tx,
struct sk_buff *skb,
struct ieee80211_tx_info *info,
@@ -1205,19 +1108,6 @@ ieee80211_tx_prepare(struct ieee80211_su
tx->sdata = sdata;
tx->channel = local->hw.conf.channel;
- /* process and remove the injection radiotap header */
- if (unlikely(info->flags & IEEE80211_TX_INTFL_HAS_RADIOTAP)) {
- if (!__ieee80211_parse_tx_radiotap(tx, skb))
- return TX_DROP;
-
- /*
- * __ieee80211_parse_tx_radiotap has now removed
- * the radiotap header that was present and pre-filled
- * 'tx' with tx control information.
- */
- info->flags &= ~IEEE80211_TX_INTFL_HAS_RADIOTAP;
- }
-
/*
* If this flag is set to true anywhere, and we get here,
* we are doing the needed processing, so remove the flag
@@ -1559,6 +1449,89 @@ void ieee80211_xmit(struct ieee80211_sub
rcu_read_unlock();
}
+static bool ieee80211_parse_tx_radiotap(struct sk_buff *skb)
+{
+ struct ieee80211_radiotap_iterator iterator;
+ struct ieee80211_radiotap_header *rthdr =
+ (struct ieee80211_radiotap_header *) skb->data;
+ struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
+ int ret = ieee80211_radiotap_iterator_init(&iterator, rthdr, skb->len,
+ NULL);
+ u16 txflags;
+
+ info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT |
+ IEEE80211_TX_CTL_DONTFRAG;
+
+ /*
+ * for every radiotap entry that is present
+ * (ieee80211_radiotap_iterator_next returns -ENOENT when no more
+ * entries present, or -EINVAL on error)
+ */
+
+ while (!ret) {
+ ret = ieee80211_radiotap_iterator_next(&iterator);
+
+ if (ret)
+ continue;
+
+ /* see if this argument is something we can use */
+ switch (iterator.this_arg_index) {
+ /*
+ * You must take care when dereferencing iterator.this_arg
+ * for multibyte types... the pointer is not aligned. Use
+ * get_unaligned((type *)iterator.this_arg) to dereference
+ * iterator.this_arg for type "type" safely on all arches.
+ */
+ case IEEE80211_RADIOTAP_FLAGS:
+ if (*iterator.this_arg & IEEE80211_RADIOTAP_F_FCS) {
+ /*
+ * this indicates that the skb we have been
+ * handed has the 32-bit FCS CRC at the end...
+ * we should react to that by snipping it off
+ * because it will be recomputed and added
+ * on transmission
+ */
+ if (skb->len < (iterator._max_length + FCS_LEN))
+ return false;
+
+ skb_trim(skb, skb->len - FCS_LEN);
+ }
+ if (*iterator.this_arg & IEEE80211_RADIOTAP_F_WEP)
+ info->flags &= ~IEEE80211_TX_INTFL_DONT_ENCRYPT;
+ if (*iterator.this_arg & IEEE80211_RADIOTAP_F_FRAG)
+ info->flags &= ~IEEE80211_TX_CTL_DONTFRAG;
+ break;
+
+ case IEEE80211_RADIOTAP_TX_FLAGS:
+ txflags = get_unaligned_le16(iterator.this_arg);
+ if (txflags & IEEE80211_RADIOTAP_F_TX_NOACK)
+ info->flags |= IEEE80211_TX_CTL_NO_ACK;
+ break;
+
+ /*
+ * Please update the file
+ * Documentation/networking/mac80211-injection.txt
+ * when parsing new fields here.
+ */
+
+ default:
+ break;
+ }
+ }
+
+ if (ret != -ENOENT) /* ie, if we didn't simply run out of fields */
+ return false;
+
+ /*
+ * remove the radiotap header
+ * iterator->_max_length was sanity-checked against
+ * skb->len by iterator init
+ */
+ skb_pull(skb, iterator._max_length);
+
+ return true;
+}
+
netdev_tx_t ieee80211_monitor_start_xmit(struct sk_buff *skb,
struct net_device *dev)
{
@@ -1646,8 +1619,11 @@ netdev_tx_t ieee80211_monitor_start_xmit
memset(info, 0, sizeof(*info));
info->flags = IEEE80211_TX_CTL_REQ_TX_STATUS |
- IEEE80211_TX_CTL_INJECTED |
- IEEE80211_TX_INTFL_HAS_RADIOTAP;
+ IEEE80211_TX_CTL_INJECTED;
+
+ /* process and remove the injection radiotap header */
+ if (!ieee80211_parse_tx_radiotap(skb))
+ goto fail;
rcu_read_lock();
@@ -1674,7 +1650,6 @@ netdev_tx_t ieee80211_monitor_start_xmit
}
}
- /* pass the radiotap header up to xmit */
ieee80211_xmit(sdata, skb);
rcu_read_unlock();
--- a/include/net/mac80211.h 2011-10-07 11:01:03.000000000 +0200
+++ b/include/net/mac80211.h 2011-10-07 11:09:41.000000000 +0200
@@ -349,8 +349,6 @@ struct ieee80211_bss_conf {
* @IEEE80211_TX_INTFL_RETRANSMISSION: This frame is being retransmitted
* after TX status because the destination was asleep, it must not
* be modified again (no seqno assignment, crypto, etc.)
- * @IEEE80211_TX_INTFL_HAS_RADIOTAP: This frame was injected and still
- * has a radiotap header at skb->data.
* @IEEE80211_TX_INTFL_NL80211_FRAME_TX: Frame was requested through nl80211
* MLME command (internal to mac80211 to figure out whether to send TX
* status to user space)
@@ -402,7 +400,7 @@ enum mac80211_tx_control_flags {
IEEE80211_TX_CTL_POLL_RESPONSE = BIT(17),
IEEE80211_TX_CTL_MORE_FRAMES = BIT(18),
IEEE80211_TX_INTFL_RETRANSMISSION = BIT(19),
- IEEE80211_TX_INTFL_HAS_RADIOTAP = BIT(20),
+ /* hole at 20, use later */
IEEE80211_TX_INTFL_NL80211_FRAME_TX = BIT(21),
IEEE80211_TX_CTL_LDPC = BIT(22),
IEEE80211_TX_CTL_STBC = BIT(23) | BIT(24),
prev parent reply other threads:[~2011-10-07 12:05 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-10-07 12:01 [PATCH 0/4] mac80211 radiotap TX cleanup Johannes Berg
2011-10-07 12:01 ` [PATCH 1/4] mac80211: optimise monitor xmit Johannes Berg
2011-10-07 12:01 ` [PATCH 2/4] mac80211: remove tx_data ethertype Johannes Berg
2011-10-07 12:01 ` [PATCH 3/4] mac80211: move fragment flag to info flag as dont-fragment Johannes Berg
2011-10-07 12:01 ` Johannes Berg [this message]
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20111007120217.591455761@sipsolutions.net \
--to=johannes@sipsolutions.net \
--cc=linux-wireless@vger.kernel.org \
--cc=linville@tuxdriver.com \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).