1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
|
/*
* 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"
#include "lib/ip.h"
extern list global_iface_list;
struct proto;
struct pool;
struct ifa { /* Interface address */
node n;
struct iface *iface; /* Interface this address belongs to */
net_addr prefix; /* Network prefix */
ip_addr ip; /* IP address of this host */
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 */
};
extern struct iface default_vrf;
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 */
struct iface *master; /* Master iface (e.g. for VRF) */
list addrs; /* Addresses assigned to this interface */
struct ifa *addr4; /* Primary address for IPv4 */
struct ifa *addr6; /* Primary address for IPv6 */
struct ifa *llv6; /* Primary link-local address for IPv6 */
ip4_addr sysdep; /* Arbitrary IPv4 address for internal sysdep use */
list neighbors; /* All neighbors on this interface */
};
#define IF_UP 1 /* Currently just IF_ADMIN_UP */
#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 /* Iface touched in last scan */
#define IF_NEEDS_RECALC 0x80000000 /* Preferred address recalculation is needed */
#define IF_LOST_ADDR4 0x01000000 /* Preferred address was deleted, notification needed */
#define IF_LOST_ADDR6 0x02000000
#define IF_LOST_LLV6 0x04000000
#define IA_UPDATED IF_UPDATED /* Address 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_ADDR4 0x100 /* Change of iface->addr4 */
#define IF_CHANGE_ADDR6 0x200 /* ... */
#define IF_CHANGE_LLV6 0x400
#define IF_CHANGE_SYSDEP 0x800
#define IF_CHANGE_TOO_MUCH 0x40000000 /* Used internally */
#define IF_CHANGE_UPDOWN (IF_CHANGE_UP | IF_CHANGE_DOWN)
#define IF_CHANGE_PREFERRED (IF_CHANGE_ADDR4 | IF_CHANGE_ADDR6 | IF_CHANGE_LLV6)
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(const char *);
struct iface *if_get_by_name(const char *);
void if_recalc_all_preferred_addresses(void);
/* The Neighbor Cache */
typedef struct neighbor {
node n; /* Node in neighbor hash table chain */
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 iface *ifreq; /* Requested iface, NULL for any */
struct proto *proto; /* Protocol this belongs to */
void *data; /* Protocol-specific data */
uint aux; /* Protocol-specific data */
u16 flags; /* NEF_* flags */
s16 scope; /* Address scope, -1 for unreachable neighbors,
SCOPE_HOST when it's our own address */
} neighbor;
#define NEF_STICKY 1
#define NEF_ONLINK 2
#define NEF_IFACE 4 /* Entry for whole iface */
neighbor *neigh_find(struct proto *p, ip_addr a, struct iface *ifa, uint flags);
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_up(struct ifa *a);
void neigh_ifa_down(struct ifa *a);
void neigh_init(struct pool *);
/*
* Interface Pattern Lists
*/
struct iface_patt_node {
node n;
int positive;
const byte *pattern;
net_addr prefix;
};
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
|
