[mirror_frr.git] / ospfd / ospf_network.c

/*
 * 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"

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,
			      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
		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
		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));

	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));

	return ret;
}

int ospf_sock_init(void)
{
	int ospf_sock;
	int ret, hincl = 1;
	int bufsize = (8 * 1024 * 1024);

	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"
	ret = setsockopt_ipv4_tos(ospf_sock, IPTOS_PREC_INTERNETCONTROL);
	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));
	}

	setsockopt_so_sendbuf(ospf_sock, bufsize);
	setsockopt_so_recvbuf(ospf_sock, bufsize);

	return ospf_sock;
}
Commit	Line	Data
718e3744	1	/*
	2	* OSPF network related functions
	3	* Copyright (C) 1999 Toshiaki Takada
	4	*
	5	* This file is part of GNU Zebra.
	6	*
	7	* GNU Zebra is free software; you can redistribute it and/or modify it
	8	* under the terms of the GNU General Public License as published by the
	9	* Free Software Foundation; either version 2, or (at your option) any
	10	* later version.
	11	*
	12	* GNU Zebra is distributed in the hope that it will be useful, but
	13	* WITHOUT ANY WARRANTY; without even the implied warranty of
	14	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
	15	* General Public License for more details.
	16	*
896014f4 DL	17	* You should have received a copy of the GNU General Public License along
	18	* with this program; see the file COPYING; if not, write to the Free Software
	19	* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
718e3744	20	*/
	21
	22	#include <zebra.h>
	23
	24	#include "thread.h"
	25	#include "linklist.h"
	26	#include "prefix.h"
	27	#include "if.h"
	28	#include "sockunion.h"
	29	#include "log.h"
	30	#include "sockopt.h"
edd7c245	31	#include "privs.h"
	32
	33	extern struct zebra_privs_t ospfd_privs;
718e3744	34
	35	#include "ospfd/ospfd.h"
	36	#include "ospfd/ospf_network.h"
	37	#include "ospfd/ospf_interface.h"
	38	#include "ospfd/ospf_asbr.h"
	39	#include "ospfd/ospf_lsa.h"
	40	#include "ospfd/ospf_lsdb.h"
	41	#include "ospfd/ospf_neighbor.h"
	42	#include "ospfd/ospf_packet.h"
	43
edd7c245	44
718e3744	45	/* Join to the OSPF ALL SPF ROUTERS multicast group. */
d62a17ae	46	int ospf_if_add_allspfrouters(struct ospf top, struct prefix p,
d62a17ae	47	ifindex_t ifindex)
718e3744	48	{
d62a17ae	49	int ret;
	50
	51	ret = setsockopt_ipv4_multicast(top->fd, IP_ADD_MEMBERSHIP,
	52	p->u.prefix4, htonl(OSPF_ALLSPFROUTERS),
	53	ifindex);
	54	if (ret < 0)
	55	zlog_warn(
	56	"can't setsockopt IP_ADD_MEMBERSHIP (fd %d, addr %s, "
	57	"ifindex %u, AllSPFRouters): %s; perhaps a kernel limit "
	58	"on # of multicast group memberships has been exceeded?",
	59	top->fd, inet_ntoa(p->u.prefix4), ifindex,
	60	safe_strerror(errno));
	61	else
	62	zlog_debug(
	63	"interface %s [%u] join AllSPFRouters Multicast group.",
	64	inet_ntoa(p->u.prefix4), ifindex);
	65
	66	return ret;
718e3744	67	}
718e3744	68
d62a17ae	69	int ospf_if_drop_allspfrouters(struct ospf top, struct prefix p,
d62a17ae	70	ifindex_t ifindex)
718e3744	71	{
d62a17ae	72	int ret;
	73
	74	ret = setsockopt_ipv4_multicast(top->fd, IP_DROP_MEMBERSHIP,
	75	p->u.prefix4, htonl(OSPF_ALLSPFROUTERS),
	76	ifindex);
	77	if (ret < 0)
	78	zlog_warn(
	79	"can't setsockopt IP_DROP_MEMBERSHIP (fd %d, addr %s, "
	80	"ifindex %u, AllSPFRouters): %s",
	81	top->fd, inet_ntoa(p->u.prefix4), ifindex,
	82	safe_strerror(errno));
	83	else
	84	zlog_debug(
	85	"interface %s [%u] leave AllSPFRouters Multicast group.",
	86	inet_ntoa(p->u.prefix4), ifindex);
	87
	88	return ret;
718e3744	89	}
	90
	91	/* Join to the OSPF ALL Designated ROUTERS multicast group. */
d62a17ae	92	int ospf_if_add_alldrouters(struct ospf top, struct prefix p,
d62a17ae	93	ifindex_t ifindex)
718e3744	94	{
d62a17ae	95	int ret;
	96
	97	ret = setsockopt_ipv4_multicast(top->fd, IP_ADD_MEMBERSHIP,
	98	p->u.prefix4, htonl(OSPF_ALLDROUTERS),
	99	ifindex);
	100	if (ret < 0)
	101	zlog_warn(
	102	"can't setsockopt IP_ADD_MEMBERSHIP (fd %d, addr %s, "
	103	"ifindex %u, AllDRouters): %s; perhaps a kernel limit "
	104	"on # of multicast group memberships has been exceeded?",
	105	top->fd, inet_ntoa(p->u.prefix4), ifindex,
	106	safe_strerror(errno));
	107	else
	108	zlog_debug(
	109	"interface %s [%u] join AllDRouters Multicast group.",
	110	inet_ntoa(p->u.prefix4), ifindex);
	111
	112	return ret;
718e3744	113	}
718e3744	114
d62a17ae	115	int ospf_if_drop_alldrouters(struct ospf top, struct prefix p,
d62a17ae	116	ifindex_t ifindex)
718e3744	117	{
d62a17ae	118	int ret;
	119
	120	ret = setsockopt_ipv4_multicast(top->fd, IP_DROP_MEMBERSHIP,
	121	p->u.prefix4, htonl(OSPF_ALLDROUTERS),
	122	ifindex);
	123	if (ret < 0)
	124	zlog_warn(
	125	"can't setsockopt IP_DROP_MEMBERSHIP (fd %d, addr %s, "
	126	"ifindex %u, AllDRouters): %s",
	127	top->fd, inet_ntoa(p->u.prefix4), ifindex,
	128	safe_strerror(errno));
	129	else
	130	zlog_debug(
	131	"interface %s [%u] leave AllDRouters Multicast group.",
	132	inet_ntoa(p->u.prefix4), ifindex);
	133
	134	return ret;
718e3744	135	}
718e3744	136
d62a17ae	137	int ospf_if_ipmulticast(struct ospf top, struct prefix p, ifindex_t ifindex)
718e3744	138	{
d62a17ae	139	u_char val;
	140	int ret, len;
	141
	142	/* Prevent receiving self-origined multicast packets. */
	143	ret = setsockopt_ipv4_multicast_loop(top->fd, 0);
	144	if (ret < 0)
	145	zlog_warn("can't setsockopt IP_MULTICAST_LOOP(0) for fd %d: %s",
	146	top->fd, safe_strerror(errno));
	147
	148	/* Explicitly set multicast ttl to 1 -- endo. */
	149	val = 1;
	150	len = sizeof(val);
	151	ret = setsockopt(top->fd, IPPROTO_IP, IP_MULTICAST_TTL, (void *)&val,
	152	len);
	153	if (ret < 0)
	154	zlog_warn("can't setsockopt IP_MULTICAST_TTL(1) for fd %d: %s",
	155	top->fd, safe_strerror(errno));
	156
	157	ret = setsockopt_ipv4_multicast_if(top->fd, p->u.prefix4, ifindex);
	158	if (ret < 0)
	159	zlog_warn(
	160	"can't setsockopt IP_MULTICAST_IF(fd %d, addr %s, "
	161	"ifindex %u): %s",
	162	top->fd, inet_ntoa(p->u.prefix4), ifindex,
	163	safe_strerror(errno));
	164
	165	return ret;
718e3744	166	}
718e3744	167
d62a17ae	168	int ospf_sock_init(void)
718e3744	169	{
d62a17ae	170	int ospf_sock;
	171	int ret, hincl = 1;
	172	int bufsize = (8 * 1024 * 1024);
	173
	174	if (ospfd_privs.change(ZPRIVS_RAISE))
	175	zlog_err("ospf_sock_init: could not raise privs, %s",
	176	safe_strerror(errno));
	177
	178	ospf_sock = socket(AF_INET, SOCK_RAW, IPPROTO_OSPFIGP);
	179	if (ospf_sock < 0) {
	180	int save_errno = errno;
	181	if (ospfd_privs.change(ZPRIVS_LOWER))
	182	zlog_err("ospf_sock_init: could not lower privs, %s",
	183	safe_strerror(errno));
	184	zlog_err("ospf_read_sock_init: socket: %s",
	185	safe_strerror(save_errno));
	186	exit(1);
	187	}
	188
5bd4189c	189	#ifdef IP_HDRINCL
d62a17ae	190	/* we will include IP header with packet */
	191	ret = setsockopt(ospf_sock, IPPROTO_IP, IP_HDRINCL, &hincl,
	192	sizeof(hincl));
	193	if (ret < 0) {
	194	int save_errno = errno;
	195	if (ospfd_privs.change(ZPRIVS_LOWER))
	196	zlog_err("ospf_sock_init: could not lower privs, %s",
	197	safe_strerror(errno));
	198	zlog_warn("Can't set IP_HDRINCL option for fd %d: %s",
	199	ospf_sock, safe_strerror(save_errno));
	200	}
	201	#elif defined(IPTOS_PREC_INTERNETCONTROL)
5bd4189c	202	#warning "IP_HDRINCL not available on this system"
5bd4189c	203	#warning "using IPTOS_PREC_INTERNETCONTROL"
d62a17ae	204	ret = setsockopt_ipv4_tos(ospf_sock, IPTOS_PREC_INTERNETCONTROL);
	205	if (ret < 0) {
	206	int save_errno = errno;
	207	if (ospfd_privs.change(ZPRIVS_LOWER))
	208	zlog_err("ospf_sock_init: could not lower privs, %s",
	209	safe_strerror(errno));
	210	zlog_warn("can't set sockopt IP_TOS %d to socket %d: %s", tos,
	211	ospf_sock, safe_strerror(save_errno));
	212	close(ospf_sock); /* Prevent sd leak. */
	213	return ret;
	214	}
5bd4189c	215	#else /* !IPTOS_PREC_INTERNETCONTROL */
5bd4189c	216	#warning "IP_HDRINCL not available, nor is IPTOS_PREC_INTERNETCONTROL"
d62a17ae	217	zlog_warn("IP_HDRINCL option not available");
5bd4189c	218	#endif /* IP_HDRINCL */
718e3744	219
d62a17ae	220	ret = setsockopt_ifindex(AF_INET, ospf_sock, 1);
ac191232	221
d62a17ae	222	if (ret < 0)
d62a17ae	223	zlog_warn("Can't set pktinfo option for fd %d", ospf_sock);
edd7c245	224
d62a17ae	225	if (ospfd_privs.change(ZPRIVS_LOWER)) {
	226	zlog_err("ospf_sock_init: could not lower privs, %s",
	227	safe_strerror(errno));
	228	}
a78d75b0	229
d62a17ae	230	setsockopt_so_sendbuf(ospf_sock, bufsize);
d62a17ae	231	setsockopt_so_recvbuf(ospf_sock, bufsize);
a78d75b0	232
d62a17ae	233	return ospf_sock;
718e3744	234	}