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iof-bird-daemon / nest / iface.h @ 0f32f2a6

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/*
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 *        BIRD Internet Routing Daemon -- Network Interfaces
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 *
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 *        (c) 1998--1999 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 proto;
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struct pool;
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struct ifa {                                /* Interface address */
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  node n;
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  struct iface *iface;                        /* Interface this address belongs to */
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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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  unsigned scope;                        /* Interface address scope */
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  unsigned flags;                        /* Analogous to iface->flags */
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};
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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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  list addrs;                                /* Addresses assigned to this interface */
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  struct ifa *addr;                        /* Primary address */
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  list neighbors;                        /* All neighbors on this interface */
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};
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#define IF_UP 1                                /* IF_LINK_UP and IP address known */
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#define IF_MULTIACCESS 2
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#define IF_BROADCAST 4
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#define IF_MULTICAST 8
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#define IF_ADMIN_DOWN 0x10
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#define IF_LOOPBACK 0x20
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#define IF_IGNORE 0x40                        /* Not to be used by routing protocols (loopbacks etc.) */
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#define IF_LINK_UP 0x80
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#define IA_PRIMARY 0x10000                /* This address is primary */
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#define IA_SECONDARY 0x20000                /* This address has been reported as secondary by the kernel */
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#define IA_UNNUMBERED 0x40000                /* This address belongs to an unnumbered device */
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#define IA_FLAGS 0xff0000
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#define IF_JUST_CREATED 0x10000000        /* Send creation event as soon as possible */
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#define IF_TMP_DOWN 0x20000000                /* Temporary shutdown due to interface reconfiguration */
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#define IF_UPDATED 0x40000000                /* 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_MTU 4
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#define IF_CHANGE_CREATE 8                /* Seen this interface for the first time */
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#define IF_CHANGE_TOO_MUCH 0x40000000        /* Used internally */
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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 ifa_dump(struct ifa *);
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void if_show(void);
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void if_show_summary(void);
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struct iface *if_update(struct iface *);
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struct ifa *ifa_update(struct ifa *);
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void ifa_delete(struct ifa *);
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void if_start_update(void);
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void if_end_update(void);
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void if_end_partial_update(struct iface *);
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void if_feed_baby(struct proto *);
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struct iface *if_find_by_index(unsigned);
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struct iface *if_find_by_name(char *);
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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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  node if_n;                                /* Node in per-interface neighbor list */
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  ip_addr addr;                                /* Address of the neighbor */
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  struct iface *iface;                        /* Interface it's connected to */
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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 aux;                                /* Protocol-specific data */
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  unsigned flags;
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  unsigned scope;                        /* Address scope, SCOPE_HOST when it's our own address */
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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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static inline int neigh_connected_to(struct proto *p, ip_addr *a, struct iface *i)
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{
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  neighbor *n = neigh_find(p, a, 0);
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  return n && n->iface == i;
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}
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void neigh_dump(neighbor *);
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void neigh_dump_all(void);
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void neigh_prune(void);
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void neigh_if_up(struct iface *);
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void neigh_if_down(struct iface *);
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void neigh_init(struct pool *);
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/*
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 *        Interface Pattern Lists
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 */
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struct iface_patt {
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  node n;
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  byte *pattern;                        /* Interface name pattern */
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  ip_addr prefix;                        /* Interface prefix */
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  int pxlen;
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  /* Protocol-specific data follow after this structure */
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};
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struct iface_patt *iface_patt_match(list *, struct iface *);
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int iface_patts_equal(list *, list *, int (*)(struct iface_patt *, struct iface_patt *));
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#endif