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