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git.ipfire.org Git - thirdparty/bird.git/blob - nest/iface.h
2 * BIRD Internet Routing Daemon -- Network Interfaces
4 * (c) 1998--2000 Martin Mares <mj@ucw.cz>
6 * Can be freely distributed and used under the terms of the GNU GPL.
10 #define _BIRD_IFACE_H_
12 #include "lib/lists.h"
14 extern list iface_list
;
19 struct ifa
{ /* Interface address */
21 struct iface
*iface
; /* Interface this address belongs to */
22 ip_addr ip
; /* IP address of this host */
23 ip_addr prefix
; /* Network prefix */
24 unsigned pxlen
; /* Prefix length */
25 ip_addr brd
; /* Broadcast address */
26 ip_addr opposite
; /* Opposite end of a point-to-point link */
27 unsigned scope
; /* Interface address scope */
28 unsigned flags
; /* Analogous to iface->flags */
36 unsigned index
; /* OS-dependent interface index */
37 list addrs
; /* Addresses assigned to this interface */
38 struct ifa
*addr
; /* Primary address */
39 list neighbors
; /* All neighbors on this interface */
42 #define IF_UP 1 /* IF_ADMIN_UP and IP address known */
43 #define IF_MULTIACCESS 2
44 #define IF_BROADCAST 4
45 #define IF_MULTICAST 8
46 #define IF_SHUTDOWN 0x10 /* Interface disappeared */
47 #define IF_LOOPBACK 0x20
48 #define IF_IGNORE 0x40 /* Not to be used by routing protocols (loopbacks etc.) */
49 #define IF_ADMIN_UP 0x80 /* Administrative up (e.g. IFF_UP in Linux) */
50 #define IF_LINK_UP 0x100 /* Link available (e.g. IFF_LOWER_UP in Linux) */
52 #define IA_PRIMARY 0x10000 /* This address is primary */
53 #define IA_SECONDARY 0x20000 /* This address has been reported as secondary by the kernel */
54 #define IA_PEER 0x40000 /* A peer/ptp address */
55 #define IA_HOST 0x80000 /* A host/loopback address */
56 #define IA_FLAGS 0xff0000
59 * There are three kinds of addresses in BIRD:
60 * - Standard (prefix-based) addresses, these may define ifa.opposite (for /30 or /31).
61 * - Peer/ptp addresses, without common prefix for ifa.ip and ifa.opposite.
62 * ifa.opposite is defined and ifa.prefix/pxlen == ifa.opposite/32 (for simplicity).
63 * - Host addresses, with ifa.prefix/pxlen == ifa.ip/32 (or /128).
64 * May be considered a special case of standard addresses.
66 * Peer addresses (AFAIK) do not exist in IPv6. Linux also supports generalized peer
67 * addresses (with pxlen < 32 and ifa.ip outside prefix), we do not support that.
71 #define IF_JUST_CREATED 0x10000000 /* Send creation event as soon as possible */
72 #define IF_TMP_DOWN 0x20000000 /* Temporary shutdown due to interface reconfiguration */
73 #define IF_UPDATED 0x40000000 /* Touched in last scan */
75 /* Interface change events */
77 #define IF_CHANGE_UP 1
78 #define IF_CHANGE_DOWN 2
79 #define IF_CHANGE_MTU 4
80 #define IF_CHANGE_CREATE 8 /* Seen this interface for the first time */
81 #define IF_CHANGE_LINK 0x10
82 #define IF_CHANGE_TOO_MUCH 0x40000000 /* Used internally */
85 void if_dump(struct iface
*);
86 void if_dump_all(void);
87 void ifa_dump(struct ifa
*);
89 void if_show_summary(void);
90 struct iface
*if_update(struct iface
*);
91 void if_delete(struct iface
*old
);
92 struct ifa
*ifa_update(struct ifa
*);
93 void ifa_delete(struct ifa
*);
94 void if_start_update(void);
95 void if_end_partial_update(struct iface
*);
96 void if_end_update(void);
97 void if_flush_ifaces(struct proto
*p
);
98 void if_feed_baby(struct proto
*);
99 struct iface
*if_find_by_index(unsigned);
100 struct iface
*if_find_by_name(char *);
101 struct iface
*if_get_by_name(char *);
102 void ifa_recalc_all_primary_addresses(void);
105 /* The Neighbor Cache */
107 typedef struct neighbor
{
108 node n
; /* Node in global neighbor list */
109 node if_n
; /* Node in per-interface neighbor list */
110 ip_addr addr
; /* Address of the neighbor */
111 struct ifa
*ifa
; /* Ifa on related iface */
112 struct iface
*iface
; /* Interface it's connected to */
113 struct proto
*proto
; /* Protocol this belongs to */
114 void *data
; /* Protocol-specific data */
115 unsigned aux
; /* Protocol-specific data */
117 int scope
; /* Address scope, -1 for unreachable sticky neighbors,
118 SCOPE_HOST when it's our own address */
123 #define NEF_BIND 4 /* Used internally for neighbors bound to an iface */
125 neighbor
*neigh_find(struct proto
*, ip_addr
*, unsigned flags
);
126 neighbor
*neigh_find2(struct proto
*p
, ip_addr
*a
, struct iface
*ifa
, unsigned flags
);
128 static inline int neigh_connected_to(struct proto
*p
, ip_addr
*a
, struct iface
*i
)
130 neighbor
*n
= neigh_find(p
, a
, 0);
131 return n
&& n
->iface
== i
;
134 void neigh_dump(neighbor
*);
135 void neigh_dump_all(void);
136 void neigh_prune(void);
137 void neigh_if_up(struct iface
*);
138 void neigh_if_down(struct iface
*);
139 void neigh_if_link(struct iface
*);
140 void neigh_ifa_update(struct ifa
*);
141 void neigh_init(struct pool
*);
144 * Interface Pattern Lists
147 struct iface_patt_node
{
157 list ipn_list
; /* A list of struct iface_patt_node */
159 /* Protocol-specific data follow after this structure */
162 int iface_patt_match(struct iface_patt
*ifp
, struct iface
*i
, struct ifa
*a
);
163 struct iface_patt
*iface_patt_find(list
*l
, struct iface
*i
, struct ifa
*a
);
164 int iface_patts_equal(list
*, list
*, int (*)(struct iface_patt
*, struct iface_patt
*));
167 u32
if_choose_router_id(struct iface_patt
*mask
, u32 old_id
);