ifdebug
struct ifdebug int_input, int_output; /* packet tracing stuff */
trace(struct ifdebug *ifd, struct sockaddr_in6 *who, char *p, int len, int m)
dumptrace(FILE *fp, char *dir, struct ifdebug *ifd)
static int iftraceinit(struct interface *ifp, struct ifdebug *ifd);
static void dumptrace(FILE *fp, char *dir, struct ifdebug *ifd);
iftraceinit(struct interface *ifp, struct ifdebug *ifd)
extern void trace(struct ifdebug *, struct sockaddr_in6 *, char *, int,