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/*
* BIRD Internet Routing Daemon -- Network Interfaces
*
* (c) 1998--2000 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 pool;
struct ifa { /* Interface address */
node n;
struct iface *iface; /* Interface this address belongs to */
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 */
unsigned scope; /* Interface address scope */
unsigned flags; /* Analogous to iface->flags */
};
struct iface {
node n;
char name[16];
unsigned flags;
unsigned mtu;
unsigned index; /* OS-dependent interface index */
unsigned master_index; /* Interface index of master iface */
list addrs; /* Addresses assigned to this interface */
struct ifa *addr; /* Primary address */
#ifdef IPV6
struct ifa *llv6; /* Selected IPv6 link-local address */
#endif
struct iface *master; /* Master iface (e.g. for VRF) */
list neighbors; /* All neighbors on this interface */
};
#define IF_UP 1 /* IF_ADMIN_UP and IP address known */
#define IF_MULTIACCESS 2
#define IF_BROADCAST 4
#define IF_MULTICAST 8
#define IF_SHUTDOWN 0x10 /* Interface disappeared */
#define IF_LOOPBACK 0x20
#define IF_IGNORE 0x40 /* Not to be used by routing protocols (loopbacks etc.) */
#define IF_ADMIN_UP 0x80 /* Administrative up (e.g. IFF_UP in Linux) */
#define IF_LINK_UP 0x100 /* Link available (e.g. IFF_LOWER_UP in Linux) */
#define IA_PRIMARY 0x10000 /* This address is primary */
#define IA_SECONDARY 0x20000 /* This address has been reported as secondary by the kernel */
#define IA_PEER 0x40000 /* A peer/ptp address */
#define IA_HOST 0x80000 /* A host/loopback address */
#define IA_FLAGS 0xff0000
/*
* There are three kinds of addresses in BIRD:
* - Standard (prefix-based) addresses, these may define ifa.opposite (for /30 or /31).
* - Peer/ptp addresses, without common prefix for ifa.ip and ifa.opposite.
* ifa.opposite is defined and ifa.prefix/pxlen == ifa.opposite/32 (for simplicity).
* - Host addresses, with ifa.prefix/pxlen == ifa.ip/32 (or /128).
* May be considered a special case of standard addresses.
*
* Peer addresses (AFAIK) do not exist in IPv6. Linux also supports generalized peer
* addresses (with pxlen < 32 and ifa.ip outside prefix), we do not support that.
*/
#define IF_JUST_CREATED 0x10000000 /* Send creation event as soon as possible */
#define IF_TMP_DOWN 0x20000000 /* Temporary shutdown due to interface reconfiguration */
#define IF_UPDATED 0x40000000 /* Touched in last scan */
/* Interface change events */
#define IF_CHANGE_UP 1
#define IF_CHANGE_DOWN 2
#define IF_CHANGE_MTU 4
#define IF_CHANGE_CREATE 8 /* Seen this interface for the first time */
#define IF_CHANGE_LINK 0x10
#define IF_CHANGE_TOO_MUCH 0x40000000 /* Used internally */
void if_init(void);
void if_dump(struct iface *);
void if_dump_all(void);
void ifa_dump(struct ifa *);
void if_show(void);
void if_show_summary(void);
struct iface *if_update(struct iface *);
void if_delete(struct iface *old);
struct ifa *ifa_update(struct ifa *);
void ifa_delete(struct ifa *);
void if_start_update(void);
void if_end_partial_update(struct iface *);
void if_end_update(void);
void if_flush_ifaces(struct proto *p);
void if_feed_baby(struct proto *);
struct iface *if_find_by_index(unsigned);
struct iface *if_find_by_name(char *);
struct iface *if_get_by_name(char *);
void ifa_recalc_all_primary_addresses(void);
static inline struct ifa *
ifa_llv6(struct iface *i UNUSED4)
{
#ifdef IPV6
return i->llv6;
#else
return NULL;
#endif
}
/* The Neighbor Cache */
typedef struct neighbor {
node n; /* Node in global neighbor list */
node if_n; /* Node in per-interface neighbor list */
ip_addr addr; /* Address of the neighbor */
struct ifa *ifa; /* Ifa on related iface */
struct iface *iface; /* Interface it's connected to */
struct proto *proto; /* Protocol this belongs to */
void *data; /* Protocol-specific data */
unsigned aux; /* Protocol-specific data */
unsigned flags;
int scope; /* Address scope, -1 for unreachable sticky neighbors,
SCOPE_HOST when it's our own address */
} neighbor;
#define NEF_STICKY 1
#define NEF_ONLINK 2
#define NEF_BIND 4 /* Used internally for neighbors bound to an iface */
neighbor *neigh_find(struct proto *, ip_addr *, unsigned flags);
neighbor *neigh_find2(struct proto *p, ip_addr *a, struct iface *ifa, unsigned flags);
static inline int neigh_connected_to(struct proto *p, ip_addr *a, struct iface *i)
{
neighbor *n = neigh_find(p, a, 0);
return n && n->iface == i;
}
void neigh_dump(neighbor *);
void neigh_dump_all(void);
void neigh_prune(void);
void neigh_if_up(struct iface *);
void neigh_if_down(struct iface *);
void neigh_if_link(struct iface *);
void neigh_ifa_update(struct ifa *);
void neigh_init(struct pool *);
/*
* Interface Pattern Lists
*/
struct iface_patt_node {
node n;
int positive;
byte *pattern;
ip_addr prefix;
int pxlen;
};
struct iface_patt {
node n;
list ipn_list; /* A list of struct iface_patt_node */
/* Protocol-specific data follow after this structure */
};
int iface_patt_match(struct iface_patt *ifp, struct iface *i, struct ifa *a);
struct iface_patt *iface_patt_find(list *l, struct iface *i, struct ifa *a);
int iface_patts_equal(list *, list *, int (*)(struct iface_patt *, struct iface_patt *));
u32 if_choose_router_id(struct iface_patt *mask, u32 old_id);
#endif
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