1 files changed, 26 insertions, 27 deletions

diff --git a/pcap.c b/pcap.c
index 3d623cf..46d11a2 100644
--- a/pcap.c
+++ b/pcap.c
@@ -33,33 +33,12 @@
 #include "log.h"
 #include "pcap.h"
 #include "iov.h"
+#include "tap.h"
 
 #define PCAP_VERSION_MINOR 4
 
 static int pcap_fd = -1;
 
-/* See pcap.h from libpcap, or pcap-savefile(5) */
-static const struct {
-	uint32_t magic;
-#define PCAP_MAGIC		0xa1b2c3d4
-
-	uint16_t major;
-#define PCAP_VERSION_MAJOR	2
-
-	uint16_t minor;
-#define PCAP_VERSION_MINOR	4
-
-	int32_t thiszone;
-	uint32_t sigfigs;
-	uint32_t snaplen;
-
-	uint32_t linktype;
-#define PCAP_LINKTYPE_ETHERNET	1
-} pcap_hdr = {
-	PCAP_MAGIC, PCAP_VERSION_MAJOR, PCAP_VERSION_MINOR, 0, 0, ETH_MAX_MTU,
-	PCAP_LINKTYPE_ETHERNET
-};
-
 struct pcap_pkthdr {
 	uint32_t tv_sec;
 	uint32_t tv_usec;
@@ -73,8 +52,6 @@ struct pcap_pkthdr {
  * @iovcnt:	Number of buffers (@iov entries) in frame
  * @offset:	Byte offset of the L2 headers within @iov
  * @now:	Timestamp
- *
- * Returns: 0 on success, -errno on error writing to the file
  */
 static void pcap_frame(const struct iovec *iov, size_t iovcnt,
 		       size_t offset, const struct timespec *now)
@@ -134,10 +111,9 @@ void pcap_multiple(const struct iovec *iov, size_t frame_parts, unsigned int n,
 		pcap_frame(iov + i * frame_parts, frame_parts, offset, &now);
 }
 
-/*
- * pcap_iov - Write packet data described by an I/O vector
+/**
+ * pcap_iov() - Write packet data described by an I/O vector
  *		to a pcap file descriptor.
- *
  * @iov:	Pointer to the array of struct iovec describing the I/O vector
  *		containing packet data to write, including L2 header
  * @iovcnt:	Number of buffers (@iov entries)
@@ -162,6 +138,29 @@ void pcap_iov(const struct iovec *iov, size_t iovcnt, size_t offset)
  */
 void pcap_init(struct ctx *c)
 {
+	/* See pcap.h from libpcap, or pcap-savefile(5) */
+#define PCAP_MAGIC		0xa1b2c3d4
+#define PCAP_VERSION_MAJOR	2
+#define PCAP_VERSION_MINOR	4
+#define PCAP_LINKTYPE_ETHERNET	1
+	const struct {
+		uint32_t magic;
+		uint16_t major;
+		uint16_t minor;
+
+		int32_t thiszone;
+		uint32_t sigfigs;
+		uint32_t snaplen;
+
+		uint32_t linktype;
+	} pcap_hdr = {
+		.magic = PCAP_MAGIC,
+		.major = PCAP_VERSION_MAJOR,
+		.minor = PCAP_VERSION_MINOR,
+		.snaplen = tap_l2_max_len(c),
+		.linktype = PCAP_LINKTYPE_ETHERNET
+	};
+
 	if (pcap_fd != -1)
 		return;