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