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/*
* OSPF network related functions
* Copyright (C) 1999 Toshiaki Takada
*
* This file is part of GNU Zebra.
*
* GNU Zebra is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the
* Free Software Foundation; either version 2, or (at your option) any
* later version.
*
* GNU Zebra is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with GNU Zebra; see the file COPYING. If not, write to the Free
* Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
* 02111-1307, USA.
*/
#include <zebra.h>
#include "thread.h"
#include "linklist.h"
#include "prefix.h"
#include "if.h"
#include "sockunion.h"
#include "log.h"
#include "sockopt.h"
#include "privs.h"
extern struct zebra_privs_t ospfd_privs;
#include "ospfd/ospfd.h"
#include "ospfd/ospf_network.h"
#include "ospfd/ospf_interface.h"
#include "ospfd/ospf_asbr.h"
#include "ospfd/ospf_lsa.h"
#include "ospfd/ospf_lsdb.h"
#include "ospfd/ospf_neighbor.h"
#include "ospfd/ospf_packet.h"
/* Join to the OSPF ALL SPF ROUTERS multicast group. */
int
ospf_if_add_allspfrouters (struct ospf *top, struct prefix *p,
unsigned int ifindex)
{
int ret;
ret = setsockopt_multicast_ipv4 (top->fd, IP_ADD_MEMBERSHIP,
p->u.prefix4, htonl (OSPF_ALLSPFROUTERS),
ifindex);
if (ret < 0)
zlog_warn ("can't setsockopt IP_ADD_MEMBERSHIP (fd %d, addr %s, "
"ifindex %u, AllSPFRouters): %s; perhaps a kernel limit "
"on # of multicast group memberships has been exceeded?",
top->fd, inet_ntoa(p->u.prefix4), ifindex, safe_strerror(errno));
else
zlog_info ("interface %s [%u] join AllSPFRouters Multicast group.",
inet_ntoa (p->u.prefix4), ifindex);
return ret;
}
int
ospf_if_drop_allspfrouters (struct ospf *top, struct prefix *p,
unsigned int ifindex)
{
int ret;
ret = setsockopt_multicast_ipv4 (top->fd, IP_DROP_MEMBERSHIP,
p->u.prefix4, htonl (OSPF_ALLSPFROUTERS),
ifindex);
if (ret < 0)
zlog_warn ("can't setsockopt IP_DROP_MEMBERSHIP (fd %d, addr %s, "
"ifindex %u, AllSPFRouters): %s",
top->fd, inet_ntoa(p->u.prefix4), ifindex, safe_strerror(errno));
else
zlog_info ("interface %s [%u] leave AllSPFRouters Multicast group.",
inet_ntoa (p->u.prefix4), ifindex);
return ret;
}
/* Join to the OSPF ALL Designated ROUTERS multicast group. */
int
ospf_if_add_alldrouters (struct ospf *top, struct prefix *p, unsigned int
ifindex)
{
int ret;
ret = setsockopt_multicast_ipv4 (top->fd, IP_ADD_MEMBERSHIP,
p->u.prefix4, htonl (OSPF_ALLDROUTERS),
ifindex);
if (ret < 0)
zlog_warn ("can't setsockopt IP_ADD_MEMBERSHIP (fd %d, addr %s, "
"ifindex %u, AllDRouters): %s; perhaps a kernel limit "
"on # of multicast group memberships has been exceeded?",
top->fd, inet_ntoa(p->u.prefix4), ifindex, safe_strerror(errno));
else
zlog_info ("interface %s [%u] join AllDRouters Multicast group.",
inet_ntoa (p->u.prefix4), ifindex);
return ret;
}
int
ospf_if_drop_alldrouters (struct ospf *top, struct prefix *p, unsigned int
ifindex)
{
int ret;
ret = setsockopt_multicast_ipv4 (top->fd, IP_DROP_MEMBERSHIP,
p->u.prefix4, htonl (OSPF_ALLDROUTERS),
ifindex);
if (ret < 0)
zlog_warn ("can't setsockopt IP_DROP_MEMBERSHIP (fd %d, addr %s, "
"ifindex %u, AllDRouters): %s",
top->fd, inet_ntoa(p->u.prefix4), ifindex, safe_strerror(errno));
else
zlog_info ("interface %s [%u] leave AllDRouters Multicast group.",
inet_ntoa (p->u.prefix4), ifindex);
return ret;
}
int
ospf_if_ipmulticast (struct ospf *top, struct prefix *p, unsigned int ifindex)
{
u_char val;
int ret, len;
val = 0;
len = sizeof (val);
/* Prevent receiving self-origined multicast packets. */
ret = setsockopt (top->fd, IPPROTO_IP, IP_MULTICAST_LOOP, (void *)&val, len);
if (ret < 0)
zlog_warn ("can't setsockopt IP_MULTICAST_LOOP(0) for fd %d: %s",
top->fd, safe_strerror(errno));
/* Explicitly set multicast ttl to 1 -- endo. */
val = 1;
ret = setsockopt (top->fd, IPPROTO_IP, IP_MULTICAST_TTL, (void *)&val, len);
if (ret < 0)
zlog_warn ("can't setsockopt IP_MULTICAST_TTL(1) for fd %d: %s",
top->fd, safe_strerror (errno));
ret = setsockopt_multicast_ipv4 (top->fd, IP_MULTICAST_IF,
p->u.prefix4, 0, ifindex);
if (ret < 0)
zlog_warn("can't setsockopt IP_MULTICAST_IF(fd %d, addr %s, "
"ifindex %u): %s",
top->fd, inet_ntoa(p->u.prefix4), ifindex, safe_strerror(errno));
return ret;
}
int
ospf_sock_init (void)
{
int ospf_sock;
/*
* XXX warning: unused variable `tos'
* tos should be ifdefed similarly to usage
*/
int ret, tos, hincl = 1;
if ( ospfd_privs.change (ZPRIVS_RAISE) )
zlog_err ("ospf_sock_init: could not raise privs, %s",
safe_strerror (errno) );
ospf_sock = socket (AF_INET, SOCK_RAW, IPPROTO_OSPFIGP);
if (ospf_sock < 0)
{
int save_errno = errno;
if ( ospfd_privs.change (ZPRIVS_LOWER) )
zlog_err ("ospf_sock_init: could not lower privs, %s",
safe_strerror (errno) );
zlog_err ("ospf_read_sock_init: socket: %s", safe_strerror (save_errno));
exit(1);
}
#ifdef IP_HDRINCL
/* we will include IP header with packet */
ret = setsockopt (ospf_sock, IPPROTO_IP, IP_HDRINCL, &hincl, sizeof (hincl));
if (ret < 0)
{
int save_errno = errno;
if ( ospfd_privs.change (ZPRIVS_LOWER) )
zlog_err ("ospf_sock_init: could not lower privs, %s",
safe_strerror (errno) );
zlog_warn ("Can't set IP_HDRINCL option for fd %d: %s",
ospf_sock, safe_strerror(save_errno));
}
#elif defined (IPTOS_PREC_INTERNETCONTROL)
#warning "IP_HDRINCL not available on this system"
#warning "using IPTOS_PREC_INTERNETCONTROL"
/* Set precedence field. */
tos = IPTOS_PREC_INTERNETCONTROL;
ret = setsockopt (ospf_sock, IPPROTO_IP, IP_TOS,
(char *) &tos, sizeof (int));
if (ret < 0)
{
int save_errno = errno;
if ( ospfd_privs.change (ZPRIVS_LOWER) )
zlog_err ("ospf_sock_init: could not lower privs, %s",
safe_strerror (errno) );
zlog_warn ("can't set sockopt IP_TOS %d to socket %d: %s",
tos, ospf_sock, safe_strerror(save_errno));
close (ospf_sock); /* Prevent sd leak. */
return ret;
}
#else /* !IPTOS_PREC_INTERNETCONTROL */
#warning "IP_HDRINCL not available, nor is IPTOS_PREC_INTERNETCONTROL"
zlog_warn ("IP_HDRINCL option not available");
#endif /* IP_HDRINCL */
ret = setsockopt_ifindex (AF_INET, ospf_sock, 1);
if (ret < 0)
zlog_warn ("Can't set pktinfo option for fd %d", ospf_sock);
if (ospfd_privs.change (ZPRIVS_LOWER))
{
zlog_err ("ospf_sock_init: could not lower privs, %s",
safe_strerror (errno) );
}
return ospf_sock;
}
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