forked from Mirror/frr
8ced966f39
Instead of closing the socket, just note the failure and continue on. If we actually failed here so many other things would not be working at all, that actually closing the fd won't matter. Signed-off-by: Donald Sharp <sharpd@nvidia.com>
236 lines
6.5 KiB
C
236 lines
6.5 KiB
C
/*
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* OSPF network related functions
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* Copyright (C) 1999 Toshiaki Takada
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*
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* This file is part of GNU Zebra.
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*
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* GNU Zebra is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation; either version 2, or (at your option) any
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* later version.
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*
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* GNU Zebra is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; see the file COPYING; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include <zebra.h>
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#include "thread.h"
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#include "linklist.h"
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#include "prefix.h"
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#include "if.h"
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#include "sockunion.h"
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#include "log.h"
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#include "sockopt.h"
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#include "privs.h"
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#include "lib_errors.h"
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#include "ospfd/ospfd.h"
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#include "ospfd/ospf_network.h"
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#include "ospfd/ospf_interface.h"
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#include "ospfd/ospf_asbr.h"
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#include "ospfd/ospf_lsa.h"
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#include "ospfd/ospf_lsdb.h"
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#include "ospfd/ospf_neighbor.h"
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#include "ospfd/ospf_packet.h"
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#include "ospfd/ospf_dump.h"
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/* Join to the OSPF ALL SPF ROUTERS multicast group. */
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int ospf_if_add_allspfrouters(struct ospf *top, struct prefix *p,
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ifindex_t ifindex)
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{
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int ret;
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ret = setsockopt_ipv4_multicast(top->fd, IP_ADD_MEMBERSHIP,
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p->u.prefix4, htonl(OSPF_ALLSPFROUTERS),
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ifindex);
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if (ret < 0)
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flog_err(
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EC_LIB_SOCKET,
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"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?",
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top->fd, inet_ntoa(p->u.prefix4), ifindex,
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safe_strerror(errno));
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else {
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if (IS_DEBUG_OSPF_EVENT)
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zlog_debug(
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"interface %s [%u] join AllSPFRouters Multicast group.",
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inet_ntoa(p->u.prefix4), ifindex);
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}
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return ret;
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}
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int ospf_if_drop_allspfrouters(struct ospf *top, struct prefix *p,
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ifindex_t ifindex)
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{
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int ret;
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ret = setsockopt_ipv4_multicast(top->fd, IP_DROP_MEMBERSHIP,
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p->u.prefix4, htonl(OSPF_ALLSPFROUTERS),
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ifindex);
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if (ret < 0)
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flog_err(EC_LIB_SOCKET,
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"can't setsockopt IP_DROP_MEMBERSHIP (fd %d, addr %s, ifindex %u, AllSPFRouters): %s",
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top->fd, inet_ntoa(p->u.prefix4), ifindex,
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safe_strerror(errno));
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else {
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if (IS_DEBUG_OSPF_EVENT)
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zlog_debug(
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"interface %s [%u] leave AllSPFRouters Multicast group.",
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inet_ntoa(p->u.prefix4), ifindex);
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}
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return ret;
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}
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/* Join to the OSPF ALL Designated ROUTERS multicast group. */
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int ospf_if_add_alldrouters(struct ospf *top, struct prefix *p,
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ifindex_t ifindex)
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{
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int ret;
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ret = setsockopt_ipv4_multicast(top->fd, IP_ADD_MEMBERSHIP,
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p->u.prefix4, htonl(OSPF_ALLDROUTERS),
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ifindex);
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if (ret < 0)
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flog_err(
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EC_LIB_SOCKET,
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"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?",
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top->fd, inet_ntoa(p->u.prefix4), ifindex,
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safe_strerror(errno));
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else
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zlog_debug(
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"interface %s [%u] join AllDRouters Multicast group.",
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inet_ntoa(p->u.prefix4), ifindex);
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return ret;
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}
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int ospf_if_drop_alldrouters(struct ospf *top, struct prefix *p,
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ifindex_t ifindex)
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{
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int ret;
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ret = setsockopt_ipv4_multicast(top->fd, IP_DROP_MEMBERSHIP,
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p->u.prefix4, htonl(OSPF_ALLDROUTERS),
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ifindex);
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if (ret < 0)
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flog_err(EC_LIB_SOCKET,
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"can't setsockopt IP_DROP_MEMBERSHIP (fd %d, addr %s, ifindex %u, AllDRouters): %s",
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top->fd, inet_ntoa(p->u.prefix4), ifindex,
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safe_strerror(errno));
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else
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zlog_debug(
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"interface %s [%u] leave AllDRouters Multicast group.",
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inet_ntoa(p->u.prefix4), ifindex);
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return ret;
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}
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int ospf_if_ipmulticast(struct ospf *top, struct prefix *p, ifindex_t ifindex)
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{
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uint8_t val;
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int ret, len;
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/* Prevent receiving self-origined multicast packets. */
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ret = setsockopt_ipv4_multicast_loop(top->fd, 0);
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if (ret < 0)
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flog_err(EC_LIB_SOCKET,
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"can't setsockopt IP_MULTICAST_LOOP(0) for fd %d: %s",
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top->fd, safe_strerror(errno));
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/* Explicitly set multicast ttl to 1 -- endo. */
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val = 1;
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len = sizeof(val);
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ret = setsockopt(top->fd, IPPROTO_IP, IP_MULTICAST_TTL, (void *)&val,
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len);
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if (ret < 0)
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flog_err(EC_LIB_SOCKET,
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"can't setsockopt IP_MULTICAST_TTL(1) for fd %d: %s",
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top->fd, safe_strerror(errno));
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#ifndef GNU_LINUX
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/* For GNU LINUX ospf_write uses IP_PKTINFO, in_pktinfo to send
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* packet out of ifindex. Below would be used Non Linux system.
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*/
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ret = setsockopt_ipv4_multicast_if(top->fd, p->u.prefix4, ifindex);
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if (ret < 0)
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flog_err(EC_LIB_SOCKET,
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"can't setsockopt IP_MULTICAST_IF(fd %d, addr %s, ifindex %u): %s",
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top->fd, inet_ntoa(p->u.prefix4), ifindex,
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safe_strerror(errno));
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#endif
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return ret;
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}
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int ospf_sock_init(struct ospf *ospf)
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{
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int ospf_sock;
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int ret, hincl = 1;
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int bufsize = (8 * 1024 * 1024);
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/* silently ignore. already done */
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if (ospf->fd > 0)
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return -1;
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if (ospf->vrf_id == VRF_UNKNOWN) {
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/* silently return since VRF is not ready */
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return -1;
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}
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frr_with_privs(&ospfd_privs) {
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ospf_sock = vrf_socket(AF_INET, SOCK_RAW, IPPROTO_OSPFIGP,
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ospf->vrf_id, ospf->name);
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if (ospf_sock < 0) {
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flog_err(EC_LIB_SOCKET,
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"ospf_read_sock_init: socket: %s",
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safe_strerror(errno));
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exit(1);
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}
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#ifdef IP_HDRINCL
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/* we will include IP header with packet */
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ret = setsockopt(ospf_sock, IPPROTO_IP, IP_HDRINCL, &hincl,
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sizeof(hincl));
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if (ret < 0) {
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flog_err(EC_LIB_SOCKET,
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"Can't set IP_HDRINCL option for fd %d: %s",
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ospf_sock, safe_strerror(errno));
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break;
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}
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#elif defined(IPTOS_PREC_INTERNETCONTROL)
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#warning "IP_HDRINCL not available on this system"
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#warning "using IPTOS_PREC_INTERNETCONTROL"
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ret = setsockopt_ipv4_tos(ospf_sock,
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IPTOS_PREC_INTERNETCONTROL);
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if (ret < 0) {
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flog_err(EC_LIB_SOCKET,
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"can't set sockopt IP_TOS %d to socket %d: %s",
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tos, ospf_sock, safe_strerror(errno));
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break;
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}
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#else /* !IPTOS_PREC_INTERNETCONTROL */
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#warning "IP_HDRINCL not available, nor is IPTOS_PREC_INTERNETCONTROL"
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flog_err(EC_LIB_UNAVAILABLE, "IP_HDRINCL option not available");
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#endif /* IP_HDRINCL */
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ret = setsockopt_ifindex(AF_INET, ospf_sock, 1);
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if (ret < 0)
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flog_err(EC_LIB_SOCKET,
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"Can't set pktinfo option for fd %d",
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ospf_sock);
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}
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setsockopt_so_sendbuf(ospf_sock, bufsize);
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setsockopt_so_recvbuf(ospf_sock, bufsize);
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ospf->fd = ospf_sock;
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return ret;
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}
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