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/*
* BIRD Internet Routing Daemon -- Network Interfaces
*
* (c) 1998 Martin Mares <mj@ucw.cz>
*
* Can be freely distributed and used under the terms of the GNU GPL.
*/
#ifndef _BIRD_IFACE_H_
#define _BIRD_IFACE_H_
#include "lib/lists.h"
extern list iface_list;
struct proto;
struct iface {
node n;
char name[16];
unsigned flags;
unsigned mtu;
unsigned index; /* OS-dependent interface index */
ip_addr ip; /* IP address of this host */
ip_addr prefix; /* Network prefix */
unsigned pxlen; /* Prefix length */
ip_addr brd; /* Broadcast address */
ip_addr opposite; /* Opposite end of a point-to-point link */
struct neighbor *neigh; /* List of neighbors on this interface */
};
#define IF_UP 1
#define IF_MULTIACCESS 2
#define IF_UNNUMBERED 4
#define IF_BROADCAST 8
#define IF_MULTICAST 16
#define IF_TUNNEL 32
#define IF_ADMIN_DOWN 64
#define IF_LOOPBACK 128
#define IF_IGNORE 256
#define IF_UPDATED 0x1000 /* Touched in last scan */
/* Interface change events */
#define IF_CHANGE_UP 1
#define IF_CHANGE_DOWN 2
#define IF_CHANGE_FLAGS 4 /* Can be converted to down/up internally */
#define IF_CHANGE_MTU 8
#define IF_CHANGE_CREATE 16 /* Seen this interface for the first time */
void if_init(void);
void if_dump(struct iface *);
void if_dump_all(void);
void if_update(struct iface *);
void if_end_update(void);
void if_feed_baby(struct proto *);
/*
* Neighbor Cache. We hold (direct neighbor, protocol) pairs we've seen
* along with pointer to protocol-specific data.
*
* The primary goal of this cache is to quickly validate all incoming
* packets if their have been sent by our neighbors and to notify
* protocols about lost neighbors when an interface goes down.
*
* Anyway, it can also contain `sticky' entries for currently unreachable
* addresses which cause notification when the address becomes a neighbor.
*/
typedef struct neighbor {
node n; /* Node in global neighbor list */
ip_addr addr; /* Address of the neighbor */
struct iface *iface; /* Interface address it's connected to */
struct neighbor *sibling; /* Next in per-device chain */
struct proto *proto; /* Protocol this belongs to */
void *data; /* Protocol-specific data */
unsigned flags;
} neighbor;
#define NEF_STICKY 1
/*
* Find neighbor or return NULL if it doesn't exist.
* If you specify flags == NEF_STICKY, a sticky entry is created if the
* address is not a neighbor, but NULL can still be returned if the address
* given is invalid.
*/
neighbor *neigh_find(struct proto *, ip_addr *, unsigned flags);
void neigh_dump(neighbor *);
void neigh_dump_all(void);
#endif
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