ospfd/ospf_network.c

   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. */
  43 int
  44 ospf_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
  62 int
  63 ospf_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. */
  82 int
  83 ospf_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
 101 int
 102 ospf_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
 120 int
 121 ospf_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
 148 int
 149 ospf_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 }