ring_tx: user_may_pull_from_tx: fix check for user frame

TP_STATUS_AVAILABLE is 0, thus the condition will always be
successful. Fix this bug by properly checking kernel flags.

Signed-off-by: Daniel Borkmann <dborkman@redhat.com>

1 files changed, 1 insertions, 1 deletions

diff --git a/ring_tx.h b/ring_tx.h
index 769f27e..eff7235 100644
--- a/ring_tx.h
+++ b/ring_tx.h
@@ -24,7 +24,7 @@ extern void set_packet_loss_discard(int sock);
 
 static inline int user_may_pull_from_tx(struct tpacket2_hdr *hdr)
 {
-	return ((hdr->tp_status & TP_STATUS_AVAILABLE) == TP_STATUS_AVAILABLE);
+	return !(hdr->tp_status & (TP_STATUS_SEND_REQUEST | TP_STATUS_SENDING));
 }
 
 static inline void kernel_may_pull_from_tx(struct tpacket2_hdr *hdr)