1/* 2 * OSPF network related functions 3 * Copyright (C) 1999 Toshiaki Takada 4 * 5 * This file is part of GNU Zebra. 6 * 7 * GNU Zebra is free software; you can redistribute it and/or modify it 8 * under the terms of the GNU General Public License as published by the 9 * Free Software Foundation; either version 2, or (at your option) any 10 * later version. 11 * 12 * GNU Zebra is distributed in the hope that it will be useful, but 13 * WITHOUT ANY WARRANTY; without even the implied warranty of 14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 15 * General Public License for more details. 16 * 17 * You should have received a copy of the GNU General Public License 18 * along with GNU Zebra; see the file COPYING. If not, write to the Free 19 * Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 20 * 02111-1307, USA. 21 */ 22 23#include <zebra.h> 24 25#include "thread.h" 26#include "linklist.h" 27#include "prefix.h" 28#include "if.h" 29#include "sockunion.h" 30#include "log.h" 31#include "sockopt.h" 32 33#include "ospfd/ospfd.h" 34#include "ospfd/ospf_network.h" 35#include "ospfd/ospf_interface.h" 36#include "ospfd/ospf_asbr.h" 37#include "ospfd/ospf_lsa.h" 38#include "ospfd/ospf_lsdb.h" 39#include "ospfd/ospf_neighbor.h" 40#include "ospfd/ospf_packet.h" 41 42/* Join to the OSPF ALL SPF ROUTERS multicast group. */ 43int 44ospf_if_add_allspfrouters (struct ospf *top, struct prefix *p, 45 unsigned int ifindex) 46{ 47 int ret; 48 49 ret = setsockopt_multicast_ipv4 (top->fd, IP_ADD_MEMBERSHIP, 50 p->u.prefix4, htonl (OSPF_ALLSPFROUTERS), 51 ifindex); 52 if (ret < 0) 53 zlog_warn ("can't setsockopt IP_ADD_MEMBERSHIP (AllSPFRouters): %s", 54 strerror (errno)); 55 else 56 zlog_info ("interface %s join AllSPFRouters Multicast group.", 57 inet_ntoa (p->u.prefix4)); 58 59 return ret; 60} 61 62int 63ospf_if_drop_allspfrouters (struct ospf *top, struct prefix *p, 64 unsigned int ifindex) 65{ 66 int ret; 67 68 ret = setsockopt_multicast_ipv4 (top->fd, IP_DROP_MEMBERSHIP, 69 p->u.prefix4, htonl (OSPF_ALLSPFROUTERS), 70 ifindex); 71 if (ret < 0) 72 zlog_warn("can't setsockopt IP_DROP_MEMBERSHIP (AllSPFRouters): %s", 73 strerror (errno)); 74 else 75 zlog_info ("interface %s leave AllSPFRouters Multicast group.", 76 inet_ntoa (p->u.prefix4)); 77 78 return ret; 79} 80 81/* Join to the OSPF ALL Designated ROUTERS multicast group. */ 82int 83ospf_if_add_alldrouters (struct ospf *top, struct prefix *p, unsigned int 84 ifindex) 85{ 86 int ret; 87 88 ret = setsockopt_multicast_ipv4 (top->fd, IP_ADD_MEMBERSHIP, 89 p->u.prefix4, htonl (OSPF_ALLDROUTERS), 90 ifindex); 91 if (ret < 0) 92 zlog_warn ("can't setsockopt IP_ADD_MEMBERSHIP (AllDRouters): %s", 93 strerror (errno)); 94 else 95 zlog_info ("interface %s join AllDRouters Multicast group.", 96 inet_ntoa (p->u.prefix4)); 97 98 return ret; 99} 100 101int 102ospf_if_drop_alldrouters (struct ospf *top, struct prefix *p, unsigned int 103 ifindex) 104{ 105 int ret; 106 107 ret = setsockopt_multicast_ipv4 (top->fd, IP_DROP_MEMBERSHIP, 108 p->u.prefix4, htonl (OSPF_ALLDROUTERS), 109 ifindex); 110 if (ret < 0) 111 zlog_warn ("can't setsockopt IP_DROP_MEMBERSHIP (AllDRouters): %s", 112 strerror (errno)); 113 else 114 zlog_info ("interface %s leave AllDRouters Multicast group.", 115 inet_ntoa (p->u.prefix4)); 116 117 return ret; 118} 119 120int 121ospf_if_ipmulticast (struct ospf *top, struct prefix *p, unsigned int ifindex) 122{ 123 u_char val; 124 int ret, len; 125 126 val = 0; 127 len = sizeof (val); 128 129 /* Prevent receiving self-origined multicast packets. */ 130 ret = setsockopt (top->fd, IPPROTO_IP, IP_MULTICAST_LOOP, (void *)&val, len); 131 if (ret < 0) 132 zlog_warn ("can't setsockopt IP_MULTICAST_LOOP(0): %s", strerror (errno)); 133 134 /* Explicitly set multicast ttl to 1 -- endo. */ 135 val = 1; 136 ret = setsockopt (top->fd, IPPROTO_IP, IP_MULTICAST_TTL, (void *)&val, len); 137 if (ret < 0) 138 zlog_warn ("can't setsockopt IP_MULTICAST_TTL(1): %s", strerror (errno)); 139 140 ret = setsockopt_multicast_ipv4 (top->fd, IP_MULTICAST_IF, 141 p->u.prefix4, 0, ifindex); 142 if (ret < 0) 143 zlog_warn ("can't setsockopt IP_MULTICAST_IF: %s", strerror (errno)); 144 145 return ret; 146} 147 148int 149ospf_sock_init (void) 150{ 151 int ospf_sock; 152 int ret, tos, hincl = 1; 153 154 ospf_sock = socket (AF_INET, SOCK_RAW, IPPROTO_OSPFIGP); 155 if (ospf_sock < 0) 156 { 157 zlog_warn ("ospf_read_sock_init: socket: %s", strerror (errno)); 158 return -1; 159 } 160 161 /* Set precedence field. */ 162#ifdef IPTOS_PREC_INTERNETCONTROL 163 tos = IPTOS_PREC_INTERNETCONTROL; 164 ret = setsockopt (ospf_sock, IPPROTO_IP, IP_TOS, 165 (char *) &tos, sizeof (int)); 166 if (ret < 0) 167 { 168 zlog_warn ("can't set sockopt IP_TOS %d to socket %d", tos, ospf_sock); 169 close (ospf_sock); /* Prevent sd leak. */ 170 return ret; 171 } 172#endif /* IPTOS_PREC_INTERNETCONTROL */ 173 174 /* we will include IP header with packet */ 175 ret = setsockopt (ospf_sock, IPPROTO_IP, IP_HDRINCL, &hincl, sizeof (hincl)); 176 if (ret < 0) 177 zlog_warn ("Can't set IP_HDRINCL option"); 178 179#if defined (IP_PKTINFO) 180 ret = setsockopt (ospf_sock, IPPROTO_IP, IP_PKTINFO, &hincl, sizeof (hincl)); 181 if (ret < 0) 182 zlog_warn ("Can't set IP_PKTINFO option"); 183#elif defined (IP_RECVIF) 184 ret = setsockopt (ospf_sock, IPPROTO_IP, IP_RECVIF, &hincl, sizeof (hincl)); 185 if (ret < 0) 186 zlog_warn ("Can't set IP_RECVIF option"); 187#else 188#warning "cannot be able to receive link information on this OS" 189#endif 190 191 return ospf_sock; 192} 193