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266 lines
8.1 KiB
C
266 lines
8.1 KiB
C
/*
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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/locking.h"
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#include "lib/event.h"
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#include "lib/lists.h"
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#include "lib/tlists.h"
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#include "lib/ip.h"
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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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unsigned uc; /* Use (link) count */
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};
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extern struct iface default_vrf;
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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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unsigned uc; /* Use (link) count */
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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 IF_LOST_ADDR4 0x01000000 /* Preferred address was deleted, notification needed */
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#define IF_LOST_ADDR6 0x02000000
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#define IF_LOST_LLV6 0x04000000
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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_UPDOWN (IF_CHANGE_UP | IF_CHANGE_DOWN)
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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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struct iface *if_update_locked(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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struct iface *if_find_by_index(unsigned);
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struct iface *if_find_by_index_locked(unsigned);
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struct iface *if_find_by_name(const char *);
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struct iface *if_get_by_name(const char *);
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void if_recalc_all_preferred_addresses(void);
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struct iface *if_walk_first(void);
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struct iface *if_walk_next(struct iface *);
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void if_walk_done(void);
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#define IFACE_WALK(_i) for (struct iface *_i = if_walk_first(); _i || (if_walk_done(), 0); _i = if_walk_next(_i))
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/* The Neighbor Cache */
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typedef struct neighbor {
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node n; /* Node in neighbor hash table chain */
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node if_n; /* Node in per-interface neighbor list */
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TLIST_NODE(proto_neigh, struct neighbor) proto_n;
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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 iface *ifreq; /* Requested iface, NULL for any */
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struct proto *proto; /* Protocol this belongs to */
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void *data; /* Protocol-specific data */
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uint aux; /* Protocol-specific data */
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u16 flags; /* NEF_* flags */
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s16 scope; /* Address scope, -1 for unreachable neighbors,
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SCOPE_HOST when it's our own address */
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uint uc; /* Use (link) count */
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} neighbor;
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#define TLIST_PREFIX proto_neigh
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#define TLIST_TYPE struct neighbor
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#define TLIST_ITEM proto_n
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#define TLIST_WANT_WALK
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#define TLIST_WANT_ADD_TAIL
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#include "lib/tlists.h"
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#define NEF_STICKY 1
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#define NEF_ONLINK 2
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#define NEF_IFACE 4 /* Entry for whole iface */
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neighbor *neigh_find(struct proto *p, ip_addr a, struct iface *ifa, uint flags);
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void neigh_dump_all(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_up(struct ifa *a);
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void neigh_ifa_down(struct ifa *a);
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void neigh_init(struct pool *);
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void neigh_link(neighbor *);
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void neigh_unlink(neighbor *);
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/*
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* Notification mechanism
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*/
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#define TLIST_PREFIX ifnot
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#define TLIST_TYPE struct iface_notification
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#define TLIST_ITEM nn
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#define TLIST_WANT_WALK
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#define TLIST_WANT_ADD_TAIL
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struct iface_notification {
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TLIST_DEFAULT_NODE;
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enum {
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IFNOT_INVALID,
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IFNOT_ADDRESS,
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IFNOT_INTERFACE,
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IFNOT_NEIGHBOR,
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} type;
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unsigned flags;
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union {
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struct ifa *a;
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struct iface *i;
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neighbor *n;
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};
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};
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#include "lib/tlists.h"
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#define TLIST_PREFIX ifsub
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#define TLIST_TYPE struct iface_subscription
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#define TLIST_ITEM n
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#define TLIST_WANT_WALK
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#define TLIST_WANT_ADD_TAIL
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struct iface_subscription {
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TLIST_DEFAULT_NODE;
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event event;
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event_list *target;
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TLIST_LIST(ifnot) queue;
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void (*if_notify)(struct proto *, unsigned flags, struct iface *i);
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void (*ifa_notify)(struct proto *, unsigned flags, struct ifa *a);
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void (*neigh_notify)(struct neighbor *neigh);
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const char *name;
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int debug;
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};
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#include "lib/tlists.h"
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void if_enqueue_notify(struct iface_notification);
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void if_enqueue_notify_to(struct iface_notification x, struct iface_subscription *s);
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void iface_flush_notifications(struct iface_subscription *);
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void iface_subscribe(struct iface_subscription *);
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void iface_unsubscribe(struct iface_subscription *);
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#define iface_trace(s, fmt, args...) do { \
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if (s->debug) \
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log(L_TRACE "%s: " fmt, s->name, ##args); \
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} while (0)
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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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const 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
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