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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 this program; see the file COPYING; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 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"
#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"
#include "ospfd/ospf_dump.h"
/* Join to the OSPF ALL SPF ROUTERS multicast group. */
int ospf_if_add_allspfrouters(struct ospf *top, struct prefix *p,
ifindex_t ifindex)
{
int ret;
ret = setsockopt_ipv4_multicast(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 {
if (IS_DEBUG_OSPF_EVENT)
zlog_debug(
"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,
ifindex_t ifindex)
{
int ret;
ret = setsockopt_ipv4_multicast(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 {
if (IS_DEBUG_OSPF_EVENT)
zlog_debug(
"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,
ifindex_t ifindex)
{
int ret;
ret = setsockopt_ipv4_multicast(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_debug(
"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,
ifindex_t ifindex)
{
int ret;
ret = setsockopt_ipv4_multicast(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_debug(
"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, ifindex_t ifindex)
{
u_char val;
int ret, len;
/* Prevent receiving self-origined multicast packets. */
ret = setsockopt_ipv4_multicast_loop(top->fd, 0);
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;
len = sizeof(val);
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));
#ifndef GNU_LINUX
/* For GNU LINUX ospf_write uses IP_PKTINFO, in_pktinfo to send
* packet out of ifindex. Below would be used Non Linux system.
*/
ret = setsockopt_ipv4_multicast_if(top->fd, p->u.prefix4, 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));
#endif
return ret;
}
int ospf_sock_init(struct ospf *ospf)
{
int ospf_sock;
int ret, hincl = 1;
int bufsize = (8 * 1024 * 1024);
/* silently ignore. already done */
if (ospf->fd > 0)
return -1;
if (ospf->vrf_id == VRF_UNKNOWN) {
/* silently return since VRF is not ready */
return -1;
}
if (ospfd_privs.change(ZPRIVS_RAISE)) {
zlog_err("ospf_sock_init: could not raise privs, %s",
safe_strerror(errno));
}
ospf_sock = vrf_socket(AF_INET, SOCK_RAW, IPPROTO_OSPFIGP, ospf->vrf_id,
ospf->name);
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;
zlog_warn("Can't set IP_HDRINCL option for fd %d: %s",
ospf_sock, safe_strerror(save_errno));
close(ospf_sock);
goto out;
}
#elif defined(IPTOS_PREC_INTERNETCONTROL)
#warning "IP_HDRINCL not available on this system"
#warning "using IPTOS_PREC_INTERNETCONTROL"
ret = setsockopt_ipv4_tos(ospf_sock, IPTOS_PREC_INTERNETCONTROL);
if (ret < 0) {
int save_errno = 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. */
goto out;
}
#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);
setsockopt_so_sendbuf(ospf_sock, bufsize);
setsockopt_so_recvbuf(ospf_sock, bufsize);
ospf->fd = ospf_sock;
out:
if (ospfd_privs.change(ZPRIVS_LOWER)) {
zlog_err("ospf_sock_init: could not lower privs, %s",
safe_strerror(errno));
}
return ret;
}
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