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149 lines
4.6 KiB
C
149 lines
4.6 KiB
C
/* ICMP Router Discovery Messages
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* Copyright (C) 1997, 2000 Kunihiro Ishiguro
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*
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* This file is part of GNU Zebra.
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*
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* GNU Zebra is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation; either version 2, or (at your option) any
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* later version.
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*
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* GNU Zebra is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with GNU Zebra; see the file COPYING. If not, write to the Free
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* Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
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* 02111-1307, USA.
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*/
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/* ICMP Messages */
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#ifndef ICMP_ROUTERADVERT
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#define ICMP_ROUTERADVERT 9
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#endif /* ICMP_ROUTERADVERT */
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#ifndef ICMP_ROUTERSOLICIT
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#define ICMP_ROUTERSOLICIT 10
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#endif /* ICMP_ROUTERSOLICT */
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/* Multicast groups */
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#ifndef INADDR_ALLHOSTS_GROUP
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#define INADDR_ALLHOSTS_GROUP 0xe0000001 /* 224.0.0.1 */
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#endif /* INADDR_ALLHOSTS_GROUP */
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#ifndef INADDR_ALLRTRS_GROUP
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#define INADDR_ALLRTRS_GROUP 0xe0000002 /* 224.0.0.2 */
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#endif /* INADDR_ALLRTRS_GROUP */
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/* Comments comes from RFC1256 ICMP Router Discovery Messages. */
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struct irdp_router_interface
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{
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/* The IP destination address to be used for multicast Router
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Advertisements sent from the interface. The only permissible
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values are the all-systems multicast address, 224.0.0.1, or the
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limited-broadcast address, 255.255.255.255. (The all-systems
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address is preferred wherever possible, i.e., on any link where
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all listening hosts support IP multicast.)
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Default: 224.0.0.1 if the router supports IP multicast on the
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interface, else 255.255.255.255 */
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struct in_addr AdvertisementAddress;
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/* The maximum time allowed between sending multicast Router
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Advertisements from the interface, in seconds. Must be no less
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than 4 seconds and no greater than 1800 seconds.
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Default: 600 seconds */
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unsigned long MaxAdvertisementInterval;
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/* The minimum time allowed between sending unsolicited multicast
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Router Advertisements from the interface, in seconds. Must be no
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less than 3 seconds and no greater than MaxAdvertisementInterval.
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Default: 0.75 * MaxAdvertisementInterval */
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unsigned long MinAdvertisementInterval;
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/* The value to be placed in the Lifetime field of Router
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Advertisements sent from the interface, in seconds. Must be no
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less than MaxAdvertisementInterval and no greater than 9000
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seconds.
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Default: 3 * MaxAdvertisementInterval */
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unsigned long AdvertisementLifetime;
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/* A flag indicating whether or not the address is to be advertised.
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Default: TRUE */
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int Advertise;
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/* The preferability of the address as a default router address,
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relative to other router addresses on the same subnet. A 32-bit,
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signed, twos-complement integer, with higher values meaning more
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preferable. The minimum value (hex 80000000) is used to indicate
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that the address, even though it may be advertised, is not to be
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used by neighboring hosts as a default router address.
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Default: 0 */
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unsigned long PreferenceLevel;
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};
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struct irdp_host_interface
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{
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/* A flag indicating whether or not the host is to perform ICMP router
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discovery on the interface. */
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int PerformRouerDiscovery;
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/* The IP destination address to be used for sending Router
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Solicitations from the interface. The only permissible values
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are the all-routers multicast address, 224.0.0.2, or the
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limited-broadcast address, 255.255.255.255. (The all-routers
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address is preferred wherever possible, i.e., on any link where
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all advertising routers support IP multicast.) */
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unsigned long SolicitationAddress;
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};
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/* Route preference structure */
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struct irdp
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{
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struct in_addr prefix;
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long pref; /* preference level */
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long timer; /* lifetime timer */
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struct irdp *next; /* doubly linked list */
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struct irdp *prev; /* doubly linked list */
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};
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/* Default irdp packet interval */
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#define IRDP_DEFAULT_INTERVAL 300
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/* Router constants from RFC1256 */
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#define MAX_INITIAL_ADVERT_INTERVAL 16
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#define MAX_INITIAL_ADVERTISEMENTS 3
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#define MAX_RESPONSE_DELAY 2
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/* Host constants from RFC1256 */
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#define MAX_SOLICITATION_DELAY 1
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#define SOLICITATION_INTERVAL 3
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#define MAX_SOLICITATIONS 3
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enum
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{
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IRDP_NONE,
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IRDP_ROUTER,
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IRDP_HOST,
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};
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/* default is host mode */
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extern int irdp_mode;
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