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; 149