Annotation of embedaddon/bird2/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: #include "lib/ip.h"
14:
15: extern list iface_list;
16:
17: struct proto;
18: struct pool;
19:
20: struct ifa { /* Interface address */
21: node n;
22: struct iface *iface; /* Interface this address belongs to */
23: net_addr prefix; /* Network prefix */
24: ip_addr ip; /* IP address of this host */
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: unsigned master_index; /* Interface index of master iface */
38: struct iface *master; /* Master iface (e.g. for VRF) */
39: list addrs; /* Addresses assigned to this interface */
40: struct ifa *addr4; /* Primary address for IPv4 */
41: struct ifa *addr6; /* Primary address for IPv6 */
42: struct ifa *llv6; /* Primary link-local address for IPv6 */
43: ip4_addr sysdep; /* Arbitrary IPv4 address for internal sysdep use */
44: list neighbors; /* All neighbors on this interface */
45: };
46:
47: #define IF_UP 1 /* Currently just IF_ADMIN_UP */
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 /* Iface touched in last scan */
79: #define IF_NEEDS_RECALC 0x80000000 /* Preferred address recalculation is needed */
80: #define IF_LOST_ADDR4 0x01000000 /* Preferred address was deleted, notification needed */
81: #define IF_LOST_ADDR6 0x02000000
82: #define IF_LOST_LLV6 0x04000000
83:
84: #define IA_UPDATED IF_UPDATED /* Address touched in last scan */
85:
86: /* Interface change events */
87:
88: #define IF_CHANGE_UP 1
89: #define IF_CHANGE_DOWN 2
90: #define IF_CHANGE_MTU 4
91: #define IF_CHANGE_CREATE 8 /* Seen this interface for the first time */
92: #define IF_CHANGE_LINK 0x10
93: #define IF_CHANGE_ADDR4 0x100 /* Change of iface->addr4 */
94: #define IF_CHANGE_ADDR6 0x200 /* ... */
95: #define IF_CHANGE_LLV6 0x400
96: #define IF_CHANGE_SYSDEP 0x800
97: #define IF_CHANGE_TOO_MUCH 0x40000000 /* Used internally */
98:
99: #define IF_CHANGE_UPDOWN (IF_CHANGE_UP | IF_CHANGE_DOWN)
100: #define IF_CHANGE_PREFERRED (IF_CHANGE_ADDR4 | IF_CHANGE_ADDR6 | IF_CHANGE_LLV6)
101:
102: void if_init(void);
103: void if_dump(struct iface *);
104: void if_dump_all(void);
105: void ifa_dump(struct ifa *);
106: void if_show(void);
107: void if_show_summary(void);
108: struct iface *if_update(struct iface *);
109: void if_delete(struct iface *old);
110: struct ifa *ifa_update(struct ifa *);
111: void ifa_delete(struct ifa *);
112: void if_start_update(void);
113: void if_end_partial_update(struct iface *);
114: void if_end_update(void);
115: void if_flush_ifaces(struct proto *p);
116: void if_feed_baby(struct proto *);
117: struct iface *if_find_by_index(unsigned);
118: struct iface *if_find_by_name(char *);
119: struct iface *if_get_by_name(char *);
120: void if_recalc_all_preferred_addresses(void);
121:
122:
123: /* The Neighbor Cache */
124:
125: typedef struct neighbor {
126: node n; /* Node in global neighbor list */
127: node if_n; /* Node in per-interface neighbor list */
128: ip_addr addr; /* Address of the neighbor */
129: struct ifa *ifa; /* Ifa on related iface */
130: struct iface *iface; /* Interface it's connected to */
131: struct iface *ifreq; /* Requested iface, NULL for any */
132: struct proto *proto; /* Protocol this belongs to */
133: void *data; /* Protocol-specific data */
134: uint aux; /* Protocol-specific data */
135: u16 flags; /* NEF_* flags */
136: s16 scope; /* Address scope, -1 for unreachable neighbors,
137: SCOPE_HOST when it's our own address */
138: } neighbor;
139:
140: #define NEF_STICKY 1
141: #define NEF_ONLINK 2
142: #define NEF_IFACE 4 /* Entry for whole iface */
143:
144:
145: neighbor *neigh_find(struct proto *p, ip_addr a, struct iface *ifa, uint flags);
146:
147: void neigh_dump(neighbor *);
148: void neigh_dump_all(void);
149: void neigh_prune(void);
150: void neigh_if_up(struct iface *);
151: void neigh_if_down(struct iface *);
152: void neigh_if_link(struct iface *);
153: void neigh_ifa_update(struct ifa *);
154: void neigh_init(struct pool *);
155:
156: /*
157: * Interface Pattern Lists
158: */
159:
160: struct iface_patt_node {
161: node n;
162: int positive;
163: byte *pattern;
164: net_addr prefix;
165: };
166:
167: struct iface_patt {
168: node n;
169: list ipn_list; /* A list of struct iface_patt_node */
170:
171: /* Protocol-specific data follow after this structure */
172: };
173:
174: int iface_patt_match(struct iface_patt *ifp, struct iface *i, struct ifa *a);
175: struct iface_patt *iface_patt_find(list *l, struct iface *i, struct ifa *a);
176: int iface_patts_equal(list *, list *, int (*)(struct iface_patt *, struct iface_patt *));
177:
178:
179: u32 if_choose_router_id(struct iface_patt *mask, u32 old_id);
180:
181: #endif
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