+#include <netinet/in.h>
+
+#include <stdio.h>
+#include <netdb.h>
+
+#include "rip.h"
+
+/*
+ * Trace record format.
+ */
+struct iftrace {
+ time_t ift_stamp; /* time stamp */
+ struct sockaddr ift_who; /* from/to */
+ char *ift_packet; /* pointer to packet */
+ short ift_size; /* size of packet */
+ short ift_metric; /* metric on associated metric */
+};
+
+/*
+ * Per interface packet tracing buffers. An incoming and
+ * outgoing circular buffer of packets is maintained, per
+ * interface, for debugging. Buffers are dumped whenever
+ * an interface is marked down.
+ */
+struct ifdebug {
+ struct iftrace *ifd_records; /* array of trace records */
+ struct iftrace *ifd_front; /* next empty trace record */
+ struct interface *ifd_if; /* for locating stuff */
+};
+
+/*
+ * An ``interface'' is similar to an ifnet structure,
+ * except it doesn't contain q'ing info, and it also
+ * handles ``logical'' interfaces (remote gateways
+ * that we want to keep polling even if they go down).
+ * The list of interfaces which we maintain is used
+ * in supplying the gratuitous routing table updates.
+ */
+struct interface {
+ struct interface *int_next;
+ struct sockaddr int_addr; /* address on this host */
+ union {
+ struct sockaddr intu_broadaddr;
+ struct sockaddr intu_dstaddr;
+ } int_intu;
+#define int_broadaddr int_intu.intu_broadaddr /* broadcast address */
+#define int_dstaddr int_intu.intu_dstaddr /* other end of p-to-p link */
+ int int_metric; /* init's routing entry */
+ int int_flags; /* see below */
+ int int_net; /* network # */
+ struct ifdebug int_input, int_output; /* packet tracing stuff */
+ int int_ipackets; /* input packets received */
+ int int_opackets; /* output packets sent */
+ char *int_name; /* from kernel if structure */
+ u_short int_transitions; /* times gone up-down */
+};
+
+/*
+ * 0x1 to 0x10 are reused from the kernel's ifnet definitions,
+ * the others agree with the RTS_ flags defined below
+ */
+#define IFF_UP 0x1 /* interface is up */
+#define IFF_BROADCAST 0x2 /* broadcast address valid */
+#define IFF_DEBUG 0x4 /* turn on debugging */
+#define IFF_ROUTE 0x8 /* routing entry installed */
+#define IFF_POINTOPOINT 0x10 /* interface is point-to-point link */
+#define IFF_PASSIVE 0x20 /* can't tell if up/down */
+#define IFF_INTERFACE 0x40 /* hardware interface */
+#define IFF_REMOTE 0x80 /* interface isn't on this machine */