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/*
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 *        BIRD Internet Routing Daemon -- Network Interfaces
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 *
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 *        (c) 1998--2000 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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#include "lib/ip.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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  net_addr prefix;                        /* Network prefix */
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  ip_addr ip;                                /* IP address of this host */
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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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  unsigned master_index;                /* Interface index of master iface */
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  struct iface *master;                        /* Master iface (e.g. for VRF) */
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  list addrs;                                /* Addresses assigned to this interface */
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  struct ifa *addr4;                        /* Primary address for IPv4 */
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  struct ifa *addr6;                        /* Primary address for IPv6 */
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  struct ifa *llv6;                        /* Primary link-local address for IPv6 */
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  ip4_addr sysdep;                        /* Arbitrary IPv4 address for internal sysdep use */
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  list neighbors;                        /* All neighbors on this interface */
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};
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#define IF_UP 1                                /* Currently just IF_ADMIN_UP */
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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_SHUTDOWN 0x10                /* Interface disappeared */
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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_ADMIN_UP 0x80                /* Administrative up (e.g. IFF_UP in Linux) */
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#define IF_LINK_UP 0x100                /* Link available (e.g. IFF_LOWER_UP in Linux) */
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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_PEER 0x40000                        /* A peer/ptp address */
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#define IA_HOST 0x80000                        /* A host/loopback address */
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#define IA_FLAGS 0xff0000
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/*
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 * There are three kinds of addresses in BIRD:
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 *  - Standard (prefix-based) addresses, these may define ifa.opposite (for /30 or /31).
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 *  - Peer/ptp addresses, without common prefix for ifa.ip and ifa.opposite.
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 *    ifa.opposite is defined and ifa.prefix/pxlen == ifa.opposite/32 (for simplicity).
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 *  - Host addresses, with ifa.prefix/pxlen == ifa.ip/32 (or /128).
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 *    May be considered a special case of standard addresses.
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 *
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 * Peer addresses (AFAIK) do not exist in IPv6. Linux also supports generalized peer
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 * addresses (with pxlen < 32 and ifa.ip outside prefix), we do not support that.
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 */
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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                /* Iface touched in last scan */
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#define IF_NEEDS_RECALC        0x80000000        /* Preferred address recalculation is needed */
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#define IA_UPDATED IF_UPDATED                /* Address 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_LINK 0x10
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#define IF_CHANGE_ADDR4        0x100                /* Change of iface->addr4 */
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#define IF_CHANGE_ADDR6        0x200                /* ... */
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#define IF_CHANGE_LLV6 0x400
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#define IF_CHANGE_SYSDEP 0x800
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#define IF_CHANGE_TOO_MUCH 0x40000000        /* Used internally */
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#define IF_CHANGE_PREFERRED (IF_CHANGE_ADDR4 | IF_CHANGE_ADDR6 | IF_CHANGE_LLV6)
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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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void if_delete(struct iface *old);
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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_partial_update(struct iface *);
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void if_end_update(void);
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void if_flush_ifaces(struct proto *p);
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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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struct iface *if_get_by_name(char *);
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void if_recalc_all_preferred_addresses(void);
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/* The Neighbor Cache */
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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 ifa *ifa;                        /* Ifa on related iface */
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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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  int scope;                                /* Address scope, -1 for unreachable sticky neighbors,
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                                           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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#define NEF_ONLINK        2
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#define NEF_BIND        4                /* Used internally for neighbors bound to an iface */
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#define NEF_IFACE        8                /* Neighbors bound to iface */
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neighbor *neigh_find(struct proto *, ip_addr *, unsigned flags);
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neighbor *neigh_find2(struct proto *p, ip_addr *a, struct iface *ifa, unsigned flags);
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neighbor *neigh_find_iface(struct proto *p, struct iface *ifa);
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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_if_link(struct iface *);
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void neigh_ifa_update(struct ifa *);
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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_node {
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  node n;
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  int positive;
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  byte *pattern;
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  net_addr prefix;
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};
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struct iface_patt {
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  node n;
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  list ipn_list;                        /* A list of struct iface_patt_node */
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  /* Protocol-specific data follow after this structure */
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};
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int iface_patt_match(struct iface_patt *ifp, struct iface *i, struct ifa *a);
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struct iface_patt *iface_patt_find(list *l, struct iface *i, struct ifa *a);
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int iface_patts_equal(list *, list *, int (*)(struct iface_patt *, struct iface_patt *));
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u32 if_choose_router_id(struct iface_patt *mask, u32 old_id);
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#endif