commit 2e0ba2d689cbf0abbd8df4408956bcb8a46d50a4
Author: Romain Francoise <rfrancoise@debian.org>
Date:   Sun Aug 14 14:43:23 2011 -0700

    Make sure ppi.h is in the release tarball.
    
    Reviewed-By: Guy Harris <guy@alum.mit.edu>

diff --git a/Makefile.in b/Makefile.in
index 265b47e..04a58dc 100644
--- a/Makefile.in
+++ b/Makefile.in
@@ -168,6 +168,7 @@ HDR = \
 	oui.h \
 	pcap-missing.h \
 	pmap_prot.h \
+	ppi.h \
 	ppp.h \
 	route6d.h \
 	rpc_auth.h \
commit 5b0329a9e755e860c3ac8cd6cf383f58261e445d
Author: Michael Richardson <mcr@sandelman.ca>
Date:   Tue May 3 18:58:32 2011 -0400

    From: Darren Reed <darren.reed@oracle.com>
    To: tcpdump-workers@lists.tcpdump.org
    Date: Sat, 09 Apr 2011 12:51:14 +1000
    Subject: [tcpdump-workers] Printing PPI packets
    
    Printing PPI packets with tcpdump does not turn out
    to be that hard.
    
    My simple tests have produced the output as below.
    
    It would be worthwhile having some changes made into
    the tcpdump code base that were similar to the attached
    that print them out.

diff --git a/ppi.h b/ppi.h
new file mode 100644
index 0000000..733eb95
--- /dev/null
+++ b/ppi.h
@@ -0,0 +1,9 @@
+typedef struct ppi_header {
+	uint8_t		ppi_ver;
+	uint8_t		ppi_flags;
+	uint16_t	ppi_len;
+	uint32_t	ppi_dlt;
+} ppi_header_t;
+
+#define	PPI_HDRLEN	8
+