ospf6d/ospf6_network.c

   1 /*
   2  * Copyright (C) 2003 Yasuhiro Ohara
   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
  18  * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  19  * Boston, MA 02111-1307, USA.
  20  */
  21
  22 #include <zebra.h>
  23
  24 #include "log.h"
  25 #include "memory.h"
  26 #include "sockunion.h"
  27 #include "sockopt.h"
  28 #include "privs.h"
  29
  30 #include "libospf.h"
  31 #include "ospf6_proto.h"
  32 #include "ospf6_network.h"
  33
  34 extern struct zebra_privs_t ospf6d_privs;
  35
  36 int  ospf6_sock;
  37 struct in6_addr allspfrouters6;
  38 struct in6_addr alldrouters6;
  39
  40 /* setsockopt ReUseAddr to on */
  41 void
  42 ospf6_set_reuseaddr (void)
  43 {
  44   u_int on = 0;
  45   if (setsockopt (ospf6_sock, SOL_SOCKET, SO_REUSEADDR, &on,
  46                   sizeof (u_int)) < 0)
  47     zlog_warn ("Network: set SO_REUSEADDR failed: %s", safe_strerror (errno));
  48 }
  49
  50 /* setsockopt MulticastLoop to off */
  51 void
  52 ospf6_reset_mcastloop (void)
  53 {
  54   u_int off = 0;
  55   if (setsockopt (ospf6_sock, IPPROTO_IPV6, IPV6_MULTICAST_LOOP,
  56                   &off, sizeof (u_int)) < 0)
  57     zlog_warn ("Network: reset IPV6_MULTICAST_LOOP failed: %s",
  58                safe_strerror (errno));
  59 }
  60
  61 void
  62 ospf6_set_pktinfo (void)
  63 {
  64   setsockopt_ipv6_pktinfo (ospf6_sock, 1);
  65 }
  66
  67 void
  68 ospf6_set_transport_class (void)
  69 {
  70 #ifdef IPTOS_PREC_INTERNETCONTROL
  71   setsockopt_ipv6_tclass (ospf6_sock, IPTOS_PREC_INTERNETCONTROL);
  72 #endif
  73 }
  74
  75 void
  76 ospf6_set_checksum (void)
  77 {
  78   int offset = 12;
  79 #ifndef DISABLE_IPV6_CHECKSUM
  80   if (setsockopt (ospf6_sock, IPPROTO_IPV6, IPV6_CHECKSUM,
  81                   &offset, sizeof (offset)) < 0)
  82     zlog_warn ("Network: set IPV6_CHECKSUM failed: %s", safe_strerror (errno));
  83 #else
  84   zlog_warn ("Network: Don't set IPV6_CHECKSUM");
  85 #endif /* DISABLE_IPV6_CHECKSUM */
  86 }
  87
  88 /* Make ospf6d's server socket. */
  89 int
  90 ospf6_serv_sock (void)
  91 {
  92   if (ospf6d_privs.change (ZPRIVS_RAISE))
  93     zlog_err ("ospf6_serv_sock: could not raise privs");
  94
  95   ospf6_sock = socket (AF_INET6, SOCK_RAW, IPPROTO_OSPFIGP);
  96   if (ospf6_sock < 0)
  97     {
  98       zlog_warn ("Network: can't create OSPF6 socket.");
  99       if (ospf6d_privs.change (ZPRIVS_LOWER))
 100         zlog_err ("ospf_sock_init: could not lower privs");
 101       return -1;
 102     }
 103   if (ospf6d_privs.change (ZPRIVS_LOWER))
 104       zlog_err ("ospf_sock_init: could not lower privs");
 105
 106   /* set socket options */
 107 #if 1
 108   sockopt_reuseaddr (ospf6_sock);
 109 #else
 110   ospf6_set_reuseaddr ();
 111 #endif /*1*/
 112   ospf6_reset_mcastloop ();
 113   ospf6_set_pktinfo ();
 114   ospf6_set_transport_class ();
 115   ospf6_set_checksum ();
 116
 117   /* setup global in6_addr, allspf6 and alldr6 for later use */
 118   inet_pton (AF_INET6, ALLSPFROUTERS6, &allspfrouters6);
 119   inet_pton (AF_INET6, ALLDROUTERS6, &alldrouters6);
 120
 121   return 0;
 122 }
 123
 124 /* ospf6 set socket option */
 125 void
 126 ospf6_sso (u_int ifindex, struct in6_addr *group, int option)
 127 {
 128   struct ipv6_mreq mreq6;
 129   int ret;
 130
 131   assert (ifindex);
 132   mreq6.ipv6mr_interface = ifindex;
 133   memcpy (&mreq6.ipv6mr_multiaddr, group, sizeof (struct in6_addr));
 134
 135   ret = setsockopt (ospf6_sock, IPPROTO_IPV6, option,
 136                     &mreq6, sizeof (mreq6));
 137   if (ret < 0)
 138     zlog_err ("Network: setsockopt (%d) on ifindex %d failed: %s",
 139               option, ifindex, safe_strerror (errno));
 140 }
 141
 142 static int
 143 iov_count (struct iovec *iov)
 144 {
 145   int i;
 146   for (i = 0; iov[i].iov_base; i++)
 147     ;
 148   return i;
 149 }
 150
 151 static int
 152 iov_totallen (struct iovec *iov)
 153 {
 154   int i;
 155   int totallen = 0;
 156   for (i = 0; iov[i].iov_base; i++)
 157     totallen += iov[i].iov_len;
 158   return totallen;
 159 }
 160
 161 int
 162 ospf6_sendmsg (struct in6_addr *src, struct in6_addr *dst,
 163                unsigned int *ifindex, struct iovec *message)
 164 {
 165   int retval;
 166   struct msghdr smsghdr;
 167   struct cmsghdr *scmsgp;
 168   u_char cmsgbuf[CMSG_SPACE(sizeof (struct in6_pktinfo))];
 169   struct in6_pktinfo *pktinfo;
 170   struct sockaddr_in6 dst_sin6;
 171
 172   assert (dst);
 173   assert (*ifindex);
 174
 175   scmsgp = (struct cmsghdr *)cmsgbuf;
 176   pktinfo = (struct in6_pktinfo *)(CMSG_DATA(scmsgp));
 177   memset (&dst_sin6, 0, sizeof (struct sockaddr_in6));
 178
 179   /* source address */
 180   pktinfo->ipi6_ifindex = *ifindex;
 181   if (src)
 182     memcpy (&pktinfo->ipi6_addr, src, sizeof (struct in6_addr));
 183   else
 184     memset (&pktinfo->ipi6_addr, 0, sizeof (struct in6_addr));
 185
 186   /* destination address */
 187   dst_sin6.sin6_family = AF_INET6;
 188 #ifdef SIN6_LEN
 189   dst_sin6.sin6_len = sizeof (struct sockaddr_in6);
 190 #endif /*SIN6_LEN*/
 191   memcpy (&dst_sin6.sin6_addr, dst, sizeof (struct in6_addr));
 192 #ifdef HAVE_SIN6_SCOPE_ID
 193   dst_sin6.sin6_scope_id = *ifindex;
 194 #endif
 195
 196   /* send control msg */
 197   scmsgp->cmsg_level = IPPROTO_IPV6;
 198   scmsgp->cmsg_type = IPV6_PKTINFO;
 199   scmsgp->cmsg_len = CMSG_LEN (sizeof (struct in6_pktinfo));
 200   /* scmsgp = CMSG_NXTHDR (&smsghdr, scmsgp); */
 201
 202   /* send msg hdr */
 203   memset (&smsghdr, 0, sizeof (smsghdr));
 204   smsghdr.msg_iov = message;
 205   smsghdr.msg_iovlen = iov_count (message);
 206   smsghdr.msg_name = (caddr_t) &dst_sin6;
 207   smsghdr.msg_namelen = sizeof (struct sockaddr_in6);
 208   smsghdr.msg_control = (caddr_t) cmsgbuf;
 209   smsghdr.msg_controllen = sizeof (cmsgbuf);
 210
 211   retval = sendmsg (ospf6_sock, &smsghdr, 0);
 212   if (retval != iov_totallen (message))
 213     zlog_warn ("sendmsg failed: ifindex: %d: %s (%d)",
 214                *ifindex, safe_strerror (errno), errno);
 215
 216   return retval;
 217 }
 218
 219 int
 220 ospf6_recvmsg (struct in6_addr *src, struct in6_addr *dst,
 221                unsigned int *ifindex, struct iovec *message)
 222 {
 223   int retval;
 224   struct msghdr rmsghdr;
 225   struct cmsghdr *rcmsgp;
 226   u_char cmsgbuf[CMSG_SPACE(sizeof (struct in6_pktinfo))];
 227   struct in6_pktinfo *pktinfo;
 228   struct sockaddr_in6 src_sin6;
 229
 230   rcmsgp = (struct cmsghdr *)cmsgbuf;
 231   pktinfo = (struct in6_pktinfo *)(CMSG_DATA(rcmsgp));
 232   memset (&src_sin6, 0, sizeof (struct sockaddr_in6));
 233
 234   /* receive control msg */
 235   rcmsgp->cmsg_level = IPPROTO_IPV6;
 236   rcmsgp->cmsg_type = IPV6_PKTINFO;
 237   rcmsgp->cmsg_len = CMSG_LEN (sizeof (struct in6_pktinfo));
 238   /* rcmsgp = CMSG_NXTHDR (&rmsghdr, rcmsgp); */
 239
 240   /* receive msg hdr */
 241   memset (&rmsghdr, 0, sizeof (rmsghdr));
 242   rmsghdr.msg_iov = message;
 243   rmsghdr.msg_iovlen = iov_count (message);
 244   rmsghdr.msg_name = (caddr_t) &src_sin6;
 245   rmsghdr.msg_namelen = sizeof (struct sockaddr_in6);
 246   rmsghdr.msg_control = (caddr_t) cmsgbuf;
 247   rmsghdr.msg_controllen = sizeof (cmsgbuf);
 248
 249   retval = recvmsg (ospf6_sock, &rmsghdr, 0);
 250   if (retval < 0)
 251     zlog_warn ("recvmsg failed: %s", safe_strerror (errno));
 252   else if (retval == iov_totallen (message))
 253     zlog_warn ("recvmsg read full buffer size: %d", retval);
 254
 255   /* source address */
 256   assert (src);
 257   memcpy (src, &src_sin6.sin6_addr, sizeof (struct in6_addr));
 258
 259   /* destination address */
 260   if (ifindex)
 261     *ifindex = pktinfo->ipi6_ifindex;
 262   if (dst)
 263     memcpy (dst, &pktinfo->ipi6_addr, sizeof (struct in6_addr));
 264
 265   return retval;
 266 }
 267
 268