Annotation of embedaddon/bird/nest/iface.h, revision 1.1.1.2
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 */
1.1.1.2 ! misho 37: unsigned master_index; /* Interface index of master iface */
1.1 misho 38: list addrs; /* Addresses assigned to this interface */
39: struct ifa *addr; /* Primary address */
1.1.1.2 ! misho 40: #ifdef IPV6
! 41: struct ifa *llv6; /* Selected IPv6 link-local address */
! 42: #endif
! 43: struct iface *master; /* Master iface (e.g. for VRF) */
1.1 misho 44: list neighbors; /* All neighbors on this interface */
45: };
46:
47: #define IF_UP 1 /* IF_ADMIN_UP and IP address known */
48: #define IF_MULTIACCESS 2
49: #define IF_BROADCAST 4
50: #define IF_MULTICAST 8
51: #define IF_SHUTDOWN 0x10 /* Interface disappeared */
52: #define IF_LOOPBACK 0x20
53: #define IF_IGNORE 0x40 /* Not to be used by routing protocols (loopbacks etc.) */
54: #define IF_ADMIN_UP 0x80 /* Administrative up (e.g. IFF_UP in Linux) */
55: #define IF_LINK_UP 0x100 /* Link available (e.g. IFF_LOWER_UP in Linux) */
56:
57: #define IA_PRIMARY 0x10000 /* This address is primary */
58: #define IA_SECONDARY 0x20000 /* This address has been reported as secondary by the kernel */
59: #define IA_PEER 0x40000 /* A peer/ptp address */
60: #define IA_HOST 0x80000 /* A host/loopback address */
61: #define IA_FLAGS 0xff0000
62:
63: /*
64: * There are three kinds of addresses in BIRD:
65: * - Standard (prefix-based) addresses, these may define ifa.opposite (for /30 or /31).
66: * - Peer/ptp addresses, without common prefix for ifa.ip and ifa.opposite.
67: * ifa.opposite is defined and ifa.prefix/pxlen == ifa.opposite/32 (for simplicity).
68: * - Host addresses, with ifa.prefix/pxlen == ifa.ip/32 (or /128).
69: * May be considered a special case of standard addresses.
70: *
71: * Peer addresses (AFAIK) do not exist in IPv6. Linux also supports generalized peer
72: * addresses (with pxlen < 32 and ifa.ip outside prefix), we do not support that.
73: */
74:
75:
76: #define IF_JUST_CREATED 0x10000000 /* Send creation event as soon as possible */
77: #define IF_TMP_DOWN 0x20000000 /* Temporary shutdown due to interface reconfiguration */
78: #define IF_UPDATED 0x40000000 /* Touched in last scan */
79:
80: /* Interface change events */
81:
82: #define IF_CHANGE_UP 1
83: #define IF_CHANGE_DOWN 2
84: #define IF_CHANGE_MTU 4
85: #define IF_CHANGE_CREATE 8 /* Seen this interface for the first time */
86: #define IF_CHANGE_LINK 0x10
87: #define IF_CHANGE_TOO_MUCH 0x40000000 /* Used internally */
88:
89: void if_init(void);
90: void if_dump(struct iface *);
91: void if_dump_all(void);
92: void ifa_dump(struct ifa *);
93: void if_show(void);
94: void if_show_summary(void);
95: struct iface *if_update(struct iface *);
96: void if_delete(struct iface *old);
97: struct ifa *ifa_update(struct ifa *);
98: void ifa_delete(struct ifa *);
99: void if_start_update(void);
100: void if_end_partial_update(struct iface *);
101: void if_end_update(void);
102: void if_flush_ifaces(struct proto *p);
103: void if_feed_baby(struct proto *);
104: struct iface *if_find_by_index(unsigned);
105: struct iface *if_find_by_name(char *);
106: struct iface *if_get_by_name(char *);
107: void ifa_recalc_all_primary_addresses(void);
108:
1.1.1.2 ! misho 109: static inline struct ifa *
! 110: ifa_llv6(struct iface *i UNUSED4)
! 111: {
! 112: #ifdef IPV6
! 113: return i->llv6;
! 114: #else
! 115: return NULL;
! 116: #endif
! 117: }
! 118:
1.1 misho 119:
120: /* The Neighbor Cache */
121:
122: typedef struct neighbor {
123: node n; /* Node in global neighbor list */
124: node if_n; /* Node in per-interface neighbor list */
125: ip_addr addr; /* Address of the neighbor */
126: struct ifa *ifa; /* Ifa on related iface */
127: struct iface *iface; /* Interface it's connected to */
128: struct proto *proto; /* Protocol this belongs to */
129: void *data; /* Protocol-specific data */
130: unsigned aux; /* Protocol-specific data */
131: unsigned flags;
132: int scope; /* Address scope, -1 for unreachable sticky neighbors,
133: SCOPE_HOST when it's our own address */
134: } neighbor;
135:
136: #define NEF_STICKY 1
137: #define NEF_ONLINK 2
138: #define NEF_BIND 4 /* Used internally for neighbors bound to an iface */
139:
140: neighbor *neigh_find(struct proto *, ip_addr *, unsigned flags);
141: neighbor *neigh_find2(struct proto *p, ip_addr *a, struct iface *ifa, unsigned flags);
142:
143: static inline int neigh_connected_to(struct proto *p, ip_addr *a, struct iface *i)
144: {
145: neighbor *n = neigh_find(p, a, 0);
146: return n && n->iface == i;
147: }
148:
149: void neigh_dump(neighbor *);
150: void neigh_dump_all(void);
151: void neigh_prune(void);
152: void neigh_if_up(struct iface *);
153: void neigh_if_down(struct iface *);
154: void neigh_if_link(struct iface *);
155: void neigh_ifa_update(struct ifa *);
156: void neigh_init(struct pool *);
157:
158: /*
159: * Interface Pattern Lists
160: */
161:
162: struct iface_patt_node {
163: node n;
164: int positive;
165: byte *pattern;
166: ip_addr prefix;
167: int pxlen;
168: };
169:
170: struct iface_patt {
171: node n;
172: list ipn_list; /* A list of struct iface_patt_node */
173:
174: /* Protocol-specific data follow after this structure */
175: };
176:
177: int iface_patt_match(struct iface_patt *ifp, struct iface *i, struct ifa *a);
178: struct iface_patt *iface_patt_find(list *l, struct iface *i, struct ifa *a);
179: int iface_patts_equal(list *, list *, int (*)(struct iface_patt *, struct iface_patt *));
180:
181:
182: u32 if_choose_router_id(struct iface_patt *mask, u32 old_id);
183:
184: #endif
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