Annotation of embedaddon/bird/nest/iface.h, revision 1.1.1.1
1.1 misho 1: /*
2: * BIRD Internet Routing Daemon -- Network Interfaces
3: *
4: * (c) 1998--2000 Martin Mares <mj@ucw.cz>
5: *
6: * Can be freely distributed and used under the terms of the GNU GPL.
7: */
8:
9: #ifndef _BIRD_IFACE_H_
10: #define _BIRD_IFACE_H_
11:
12: #include "lib/lists.h"
13:
14: extern list iface_list;
15:
16: struct proto;
17: struct pool;
18:
19: struct ifa { /* Interface address */
20: node n;
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 */
29: };
30:
31: struct iface {
32: node n;
33: char name[16];
34: unsigned flags;
35: unsigned mtu;
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 */
40: };
41:
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) */
51:
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
57:
58: /*
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.
65: *
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.
68: */
69:
70:
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 */
74:
75: /* Interface change events */
76:
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 */
83:
84: void if_init(void);
85: void if_dump(struct iface *);
86: void if_dump_all(void);
87: void ifa_dump(struct ifa *);
88: void if_show(void);
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);
103:
104:
105: /* The Neighbor Cache */
106:
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 */
116: unsigned flags;
117: int scope; /* Address scope, -1 for unreachable sticky neighbors,
118: SCOPE_HOST when it's our own address */
119: } neighbor;
120:
121: #define NEF_STICKY 1
122: #define NEF_ONLINK 2
123: #define NEF_BIND 4 /* Used internally for neighbors bound to an iface */
124:
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);
127:
128: static inline int neigh_connected_to(struct proto *p, ip_addr *a, struct iface *i)
129: {
130: neighbor *n = neigh_find(p, a, 0);
131: return n && n->iface == i;
132: }
133:
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 *);
142:
143: /*
144: * Interface Pattern Lists
145: */
146:
147: struct iface_patt_node {
148: node n;
149: int positive;
150: byte *pattern;
151: ip_addr prefix;
152: int pxlen;
153: };
154:
155: struct iface_patt {
156: node n;
157: list ipn_list; /* A list of struct iface_patt_node */
158:
159: /* Protocol-specific data follow after this structure */
160: };
161:
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 *));
165:
166:
167: u32 if_choose_router_id(struct iface_patt *mask, u32 old_id);
168:
169: #endif
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