release/src/router/pptpd/pqueue.h

   1 #ifndef PQUEUE_H
   2 #define PQUEUE_H
   3
   4 #include <time.h>
   5 #include <sys/time.h>
   6
   7 /* wait this many seconds for missing packets before forgetting about them */
   8 #define DEFAULT_PACKET_TIMEOUT 0.3
   9 extern int packet_timeout_usecs;
  10
  11 /* assume packet is bad/spoofed if it's more than this many seqs ahead */
  12 #define MISSING_WINDOW 300
  13
  14 /* Packet queue structure: linked list of packets received out-of-order */
  15 typedef struct pqueue {
  16   struct pqueue *next;
  17   struct pqueue *prev;
  18   int seq;
  19   struct timeval expires;
  20   unsigned char *packet;
  21   int packlen;
  22   int capacity;
  23 } pqueue_t;
  24
  25 int       pqueue_add  (int seq, unsigned char *packet, int packlen);
  26 int       pqueue_del  (pqueue_t *point);
  27 pqueue_t *pqueue_head ();
  28 int       pqueue_expiry_time (pqueue_t *entry);
  29
  30 #endif /* PQUEUE_H */