1 files changed, 235 insertions, 0 deletions
diff --git a/ospfd/ospf_network.c b/ospfd/ospf_network.c
new file mode 100644
index 0000000..be06afe
--- /dev/null
+++ b/ospfd/ospf_network.c
@@ -0,0 +1,235 @@
+/*
+ * 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 "lib_errors.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)
+		flog_err(
+			EC_LIB_SOCKET,
+			"can't setsockopt IP_ADD_MEMBERSHIP (fd %d, addr %pI4, ifindex %u, AllSPFRouters): %s; perhaps a kernel limit on # of multicast group memberships has been exceeded?",
+			top->fd, &p->u.prefix4, ifindex,
+			safe_strerror(errno));
+	else {
+		if (IS_DEBUG_OSPF_EVENT)
+			zlog_debug(
+				"interface %pI4 [%u] join AllSPFRouters Multicast group.",
+				&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)
+		flog_err(EC_LIB_SOCKET,
+			 "can't setsockopt IP_DROP_MEMBERSHIP (fd %d, addr %pI4, ifindex %u, AllSPFRouters): %s",
+			 top->fd, &p->u.prefix4, ifindex,
+			 safe_strerror(errno));
+	else {
+		if (IS_DEBUG_OSPF_EVENT)
+			zlog_debug(
+				"interface %pI4 [%u] leave AllSPFRouters Multicast group.",
+				&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)
+		flog_err(
+			EC_LIB_SOCKET,
+			"can't setsockopt IP_ADD_MEMBERSHIP (fd %d, addr %pI4, ifindex %u, AllDRouters): %s; perhaps a kernel limit on # of multicast group memberships has been exceeded?",
+			top->fd, &p->u.prefix4, ifindex,
+			safe_strerror(errno));
+	else
+		zlog_debug(
+			"interface %pI4 [%u] join AllDRouters Multicast group.",
+			&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)
+		flog_err(EC_LIB_SOCKET,
+			 "can't setsockopt IP_DROP_MEMBERSHIP (fd %d, addr %pI4, ifindex %u, AllDRouters): %s",
+			 top->fd, &p->u.prefix4, ifindex,
+			 safe_strerror(errno));
+	else
+		zlog_debug(
+			"interface %pI4 [%u] leave AllDRouters Multicast group.",
+			&p->u.prefix4, ifindex);
+
+	return ret;
+}
+
+int ospf_if_ipmulticast(struct ospf *top, struct prefix *p, ifindex_t ifindex)
+{
+	uint8_t val;
+	int ret, len;
+
+	/* Prevent receiving self-origined multicast packets. */
+	ret = setsockopt_ipv4_multicast_loop(top->fd, 0);
+	if (ret < 0)
+		flog_err(EC_LIB_SOCKET,
+			 "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)
+		flog_err(EC_LIB_SOCKET,
+			 "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)
+		flog_err(EC_LIB_SOCKET,
+			 "can't setsockopt IP_MULTICAST_IF(fd %d, addr %pI4, ifindex %u): %s",
+			 top->fd, &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;
+	}
+	frr_with_privs(&ospfd_privs) {
+		ospf_sock = vrf_socket(AF_INET, SOCK_RAW, IPPROTO_OSPFIGP,
+				       ospf->vrf_id, ospf->name);
+		if (ospf_sock < 0) {
+			flog_err(EC_LIB_SOCKET,
+				 "ospf_read_sock_init: socket: %s",
+				 safe_strerror(errno));
+			return -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) {
+			flog_err(EC_LIB_SOCKET,
+				 "Can't set IP_HDRINCL option for fd %d: %s",
+				 ospf_sock, safe_strerror(errno));
+			break;
+		}
+#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) {
+			flog_err(EC_LIB_SOCKET,
+				 "can't set sockopt IP_TOS %d to socket %d: %s",
+				 tos, ospf_sock, safe_strerror(errno));
+			break;
+		}
+#else /* !IPTOS_PREC_INTERNETCONTROL */
+#warning "IP_HDRINCL not available, nor is IPTOS_PREC_INTERNETCONTROL"
+		flog_err(EC_LIB_UNAVAILABLE, "IP_HDRINCL option not available");
+#endif /* IP_HDRINCL */
+
+		ret = setsockopt_ifindex(AF_INET, ospf_sock, 1);
+
+		if (ret < 0)
+			flog_err(EC_LIB_SOCKET,
+				 "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;
+	return ret;
+}