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159 lines
4.8 KiB
C
159 lines
4.8 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 along
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* with this program; see the file COPYING; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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/*
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* This file is modified and completed for the Zebra IRDP implementation
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* by Robert Olsson, Swedish University of Agricultural Sciences
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*/
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#ifndef _IRDP_H
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#define _IRDP_H
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#include "lib/vty.h"
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#ifdef __cplusplus
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extern "C" {
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#endif
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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 0xe0000001U /* 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 0xe0000002U /* 224.0.0.2 */
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#endif /* INADDR_ALLRTRS_GROUP */
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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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#define IRDP_MAXADVERTINTERVAL 600
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#define IRDP_MINADVERTINTERVAL 450 /* 0.75*600 */
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#define IRDP_LIFETIME 1350 /* 3*450 */
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#define IRDP_PREFERENCE 0
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#define ICMP_MINLEN 8
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#define IRDP_LAST_ADVERT_MESSAGES 2 /* The last adverts with Holdtime 0 */
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#define IRDP_RX_BUF 1500
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/*
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Comments comes from RFC1256 ICMP Router Discovery Messages.
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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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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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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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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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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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*/
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struct irdp_interface {
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bool started;
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unsigned long MaxAdvertInterval;
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unsigned long MinAdvertInterval;
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unsigned long Preference;
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uint32_t flags;
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#define IF_ACTIVE (1<<0) /* ICMP Active */
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#define IF_BROADCAST (1<<1) /* 255.255.255.255 */
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#define IF_SOLICIT (1<<2) /* Solicit active */
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#define IF_DEBUG_MESSAGES (1<<3)
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#define IF_DEBUG_PACKET (1<<4)
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#define IF_DEBUG_MISC (1<<5)
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#define IF_SHUTDOWN (1<<6)
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struct interface *ifp;
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struct thread *t_advertise;
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unsigned long irdp_sent;
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uint16_t Lifetime;
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struct list *AdvPrefList;
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};
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struct Adv {
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struct in_addr ip;
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int pref;
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};
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extern void irdp_if_init(void);
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extern int irdp_sock_init(void);
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extern int irdp_config_write(struct vty *, struct interface *);
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extern int irdp_send_thread(struct thread *t_advert);
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extern void irdp_advert_off(struct interface *ifp);
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extern void process_solicit(struct interface *ifp);
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extern int irdp_read_raw(struct thread *r);
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extern void send_packet(struct interface *ifp, struct stream *s, uint32_t dst,
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struct prefix *p, uint32_t ttl);
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#ifdef __cplusplus
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}
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#endif
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#endif /* _IRDP_H */
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