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gerrit.opencord.org / quagga / 5b8c1b0d6af736b0633309b4b3490298b9a20742 / . / zebra / irdp.h
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paul718e3742002-12-13 20:15:29 +0000[diff] [blame]1/* ICMP Router Discovery Messages
2 * Copyright (C) 1997, 2000 Kunihiro Ishiguro
3 *
4 * This file is part of GNU Zebra.
5 *
6 * GNU Zebra is free software; you can redistribute it and/or modify it
7 * under the terms of the GNU General Public License as published by the
8 * Free Software Foundation; either version 2, or (at your option) any
9 * later version.
10 *
11 * GNU Zebra is distributed in the hope that it will be useful, but
12 * WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 * General Public License for more details.
15 *
16 * You should have received a copy of the GNU General Public License
17 * along with GNU Zebra; see the file COPYING. If not, write to the Free
18 * Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
19 * 02111-1307, USA.
20 */
21
22/* ICMP Messages */
23#ifndef ICMP_ROUTERADVERT
24#define ICMP_ROUTERADVERT 9
25#endif /* ICMP_ROUTERADVERT */
26
27#ifndef ICMP_ROUTERSOLICIT
28#define ICMP_ROUTERSOLICIT 10
29#endif /* ICMP_ROUTERSOLICT */
30
31/* Multicast groups */
32#ifndef INADDR_ALLHOSTS_GROUP
33#define INADDR_ALLHOSTS_GROUP 0xe0000001 /* 224.0.0.1 */
34#endif /* INADDR_ALLHOSTS_GROUP */
35
36#ifndef INADDR_ALLRTRS_GROUP
37#define INADDR_ALLRTRS_GROUP 0xe0000002 /* 224.0.0.2 */
38#endif /* INADDR_ALLRTRS_GROUP */
39
40/* Comments comes from RFC1256 ICMP Router Discovery Messages. */
41struct irdp_router_interface
42{
43 /* The IP destination address to be used for multicast Router
44 Advertisements sent from the interface. The only permissible
45 values are the all-systems multicast address, 224.0.0.1, or the
46 limited-broadcast address, 255.255.255.255. (The all-systems
47 address is preferred wherever possible, i.e., on any link where
48 all listening hosts support IP multicast.)
49
50 Default: 224.0.0.1 if the router supports IP multicast on the
51 interface, else 255.255.255.255 */
52
53 struct in_addr AdvertisementAddress;
54
55 /* The maximum time allowed between sending multicast Router
56 Advertisements from the interface, in seconds. Must be no less
57 than 4 seconds and no greater than 1800 seconds.
58
59 Default: 600 seconds */
60
61 unsigned long MaxAdvertisementInterval;
62
63 /* The minimum time allowed between sending unsolicited multicast
64 Router Advertisements from the interface, in seconds. Must be no
65 less than 3 seconds and no greater than MaxAdvertisementInterval.
66
67 Default: 0.75 * MaxAdvertisementInterval */
68
69 unsigned long MinAdvertisementInterval;
70
71
72 /* The value to be placed in the Lifetime field of Router
73 Advertisements sent from the interface, in seconds. Must be no
74 less than MaxAdvertisementInterval and no greater than 9000
75 seconds.
76
77 Default: 3 * MaxAdvertisementInterval */
78
79 unsigned long AdvertisementLifetime;
80
81 /* A flag indicating whether or not the address is to be advertised.
82
83 Default: TRUE */
84
85 int Advertise;
86
87
88 /* The preferability of the address as a default router address,
89 relative to other router addresses on the same subnet. A 32-bit,
90 signed, twos-complement integer, with higher values meaning more
91 preferable. The minimum value (hex 80000000) is used to indicate
92 that the address, even though it may be advertised, is not to be
93 used by neighboring hosts as a default router address.
94
95 Default: 0 */
96
97 unsigned long PreferenceLevel;
98};
99
100struct irdp_host_interface
101{
102 /* A flag indicating whether or not the host is to perform ICMP router
103 discovery on the interface. */
104 int PerformRouerDiscovery;
105
106 /* The IP destination address to be used for sending Router
107 Solicitations from the interface. The only permissible values
108 are the all-routers multicast address, 224.0.0.2, or the
109 limited-broadcast address, 255.255.255.255. (The all-routers
110 address is preferred wherever possible, i.e., on any link where
111 all advertising routers support IP multicast.) */
112 unsigned long SolicitationAddress;
113};
114
115
116/* Route preference structure */
117struct irdp
118{
119 struct in_addr prefix;
120 long pref; /* preference level */
121 long timer; /* lifetime timer */
122
123 struct irdp *next; /* doubly linked list */
124 struct irdp *prev; /* doubly linked list */
125};
126
127/* Default irdp packet interval */
128#define IRDP_DEFAULT_INTERVAL 300
129
130/* Router constants from RFC1256 */
131#define MAX_INITIAL_ADVERT_INTERVAL 16
132#define MAX_INITIAL_ADVERTISEMENTS 3
133#define MAX_RESPONSE_DELAY 2
134
135/* Host constants from RFC1256 */
136#define MAX_SOLICITATION_DELAY 1
137#define SOLICITATION_INTERVAL 3
138#define MAX_SOLICITATIONS 3
139
140enum
141{
142 IRDP_NONE,
143 IRDP_ROUTER,
144 IRDP_HOST,
145};
146
147/* default is host mode */
148extern int irdp_mode;