Add three new ioctl(2) commands for bpf(4).

- BIOCGDIRECTION and BIOCSDIRECTION get or set the setting determining
whether incoming, outgoing, or all packets on the interface should be
returned by BPF.  Set to BPF_D_IN to see only incoming packets on the
interface.  Set to BPF_D_INOUT to see packets originating locally and
remotely on the interface.  Set to BPF_D_OUT to see only outgoing
packets on the interface.  This setting is initialized to BPF_D_INOUT
by default.  BIOCGSEESENT and BIOCSSEESENT are obsoleted by these but
kept for backward compatibility.

- BIOCFEEDBACK sets packet feedback mode.  This allows injected packets
to be fed back as input to the interface when output via the interface is
successful.  When BPF_D_INOUT direction is set, injected outgoing packet
is not returned by BPF to avoid duplication.  This flag is initialized to
zero by default.

Note that libpcap has been modified to support BPF_D_OUT direction for
pcap_setdirection(3) and PCAP_D_OUT direction is functional now.

Reviewed by:	rwatson

1 files changed, 4 insertions, 2 deletions

diff --git a/sys/net/bpfdesc.h b/sys/net/bpfdesc.h
index 0edcaf6..7db0e12 100644
--- a/sys/net/bpfdesc.h
+++ b/sys/net/bpfdesc.h
@@ -81,7 +81,8 @@ struct bpf_d {
 	u_char		bd_state;	/* idle, waiting, or timed out */
 	u_char		bd_immediate;	/* true to return on packet arrival */
 	int		bd_hdrcmplt;	/* false to fill in src lladdr automatically */
-	int		bd_seesent;	/* true if bpf should see sent packets */
+	int		bd_direction;	/* select packet direction */
+	int		bd_feedback;	/* true to feed back sent packets */
 	int		bd_async;	/* non-zero if packet reception should generate signal */
 	int		bd_sig;		/* signal to send upon packet reception */
 	struct sigio *	bd_sigio;	/* information for async I/O */
@@ -119,7 +120,8 @@ struct xbpf_d {
 	u_char		bd_promisc;
 	u_char		bd_immediate;
 	int		bd_hdrcmplt;
-	int		bd_seesent;
+	int		bd_direction;
+	int		bd_feedback;
 	int		bd_async;
 	u_long		bd_rcount;
 	u_long		bd_dcount;