nest/iface.h

   1 /*
   2  *      BIRD Internet Routing Daemon -- Network Interfaces
   3  *
   4  *      (c) 1998 Martin Mares <mj@ucw.cz>
   5  *
   6  *      Can be freely distributed and used under the terms of the GNU GPL.
   7  */
   8
   9 #ifndef _BIRD_IFACE_H_
  10 #define _BIRD_IFACE_H_
  11
  12 #include "lib/lists.h"
  13
  14 extern list iface_list;
  15
  16 struct iface {
  17   node n;
  18   char name[16];
  19   unsigned flags;
  20   unsigned mtu;
  21   unsigned index;                       /* OS-dependent interface index */
  22   ip_addr ip;                           /* IP address of this host */
  23   ip_addr prefix;                       /* Network prefix */
  24   unsigned pxlen;                       /* Prefix length */
  25   ip_addr brd;                          /* Broadcast address */
  26   ip_addr opposite;                     /* Opposite end of a point-to-point link */
  27   struct neighbor *neigh;               /* List of neighbors on this interface */
  28 };
  29
  30 #define IF_UP 1
  31 #define IF_MULTIACCESS 2
  32 #define IF_UNNUMBERED 4
  33 #define IF_BROADCAST 8
  34 #define IF_MULTICAST 16
  35 #define IF_TUNNEL 32
  36 #define IF_ADMIN_DOWN 64
  37 #define IF_LOOPBACK 128
  38 #define IF_IGNORE 256
  39 #define IF_UPDATED 0x1000               /* Touched in last scan */
  40
  41 /* Interface change events */
  42
  43 #define IF_CHANGE_UP 1
  44 #define IF_CHANGE_DOWN 2
  45 #define IF_CHANGE_FLAGS 4               /* Can be converted to down/up internally */
  46 #define IF_CHANGE_MTU 8
  47 #define IF_CHANGE_CREATE 16             /* Seen this interface for the first time */
  48
  49 void if_init(void);
  50 void if_dump(struct iface *);
  51 void if_dump_all(void);
  52 void if_update(struct iface *);
  53 void if_end_update(void);
  54
  55 /*
  56  *      Neighbor Cache. We hold (direct neighbor, protocol) pairs we've seen
  57  *      along with pointer to protocol-specific data.
  58  *
  59  *      The primary goal of this cache is to quickly validate all incoming
  60  *      packets if their have been sent by our neighbors and to notify
  61  *      protocols about lost neighbors when an interface goes down.
  62  *
  63  *      Anyway, it can also contain `sticky' entries for currently unreachable
  64  *      addresses which cause notification when the address becomes a neighbor.
  65  */
  66
  67 typedef struct neighbor {
  68   node n;                               /* Node in global neighbor list */
  69   ip_addr addr;                         /* Address of the neighbor */
  70   struct iface *iface;                  /* Interface address it's connected to */
  71   struct neighbor *sibling;             /* Next in per-device chain */
  72   struct proto *proto;                  /* Protocol this belongs to */
  73   void *data;                           /* Protocol-specific data */
  74   unsigned flags;
  75 } neighbor;
  76
  77 #define NEF_STICKY 1
  78
  79 /*
  80  * Find neighbor or return NULL if it doesn't exist.
  81  * If you specify flags == NEF_STICKY, a sticky entry is created if the
  82  * address is not a neighbor, but NULL can still be returned if the address
  83  * given is invalid.
  84  */
  85 neighbor *neigh_find(struct proto *, ip_addr *, unsigned flags);
  86
  87 void neigh_dump(neighbor *);
  88 void neigh_dump_all(void);
  89
  90 #endif