[mirror_frr.git] / ospf6d / ospf6_network.c

/*
 * Copyright (C) 2003 Yasuhiro Ohara
 *
 * 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 "log.h"
#include "memory.h"
#include "sockunion.h"
#include "sockopt.h"
#include "privs.h"

#include "libospf.h"
#include "ospf6_proto.h"
#include "ospf6_network.h"

extern struct zebra_privs_t ospf6d_privs;

int ospf6_sock;
struct in6_addr allspfrouters6;
struct in6_addr alldrouters6;

/* setsockopt MulticastLoop to off */
static void ospf6_reset_mcastloop(void)
{
	u_int off = 0;
	if (setsockopt(ospf6_sock, IPPROTO_IPV6, IPV6_MULTICAST_LOOP, &off,
		       sizeof(u_int))
	    < 0)
		zlog_warn("Network: reset IPV6_MULTICAST_LOOP failed: %s",
			  safe_strerror(errno));
}

static void ospf6_set_pktinfo(void)
{
	setsockopt_ipv6_pktinfo(ospf6_sock, 1);
}

static void ospf6_set_transport_class(void)
{
#ifdef IPTOS_PREC_INTERNETCONTROL
	setsockopt_ipv6_tclass(ospf6_sock, IPTOS_PREC_INTERNETCONTROL);
#endif
}

static void ospf6_set_checksum(void)
{
	int offset = 12;
#ifndef DISABLE_IPV6_CHECKSUM
	if (setsockopt(ospf6_sock, IPPROTO_IPV6, IPV6_CHECKSUM, &offset,
		       sizeof(offset))
	    < 0)
		zlog_warn("Network: set IPV6_CHECKSUM failed: %s",
			  safe_strerror(errno));
#else
	zlog_warn("Network: Don't set IPV6_CHECKSUM");
#endif /* DISABLE_IPV6_CHECKSUM */
}

/* Make ospf6d's server socket. */
int ospf6_serv_sock(void)
{
	if (ospf6d_privs.change(ZPRIVS_RAISE))
		zlog_err("ospf6_serv_sock: could not raise privs");

	ospf6_sock = socket(AF_INET6, SOCK_RAW, IPPROTO_OSPFIGP);
	if (ospf6_sock < 0) {
		zlog_warn("Network: can't create OSPF6 socket.");
		if (ospf6d_privs.change(ZPRIVS_LOWER))
			zlog_err("ospf_sock_init: could not lower privs");
		return -1;
	}
	if (ospf6d_privs.change(ZPRIVS_LOWER))
		zlog_err("ospf_sock_init: could not lower privs");

/* set socket options */
#if 1
	sockopt_reuseaddr(ospf6_sock);
#else
	ospf6_set_reuseaddr();
#endif /*1*/
	ospf6_reset_mcastloop();
	ospf6_set_pktinfo();
	ospf6_set_transport_class();
	ospf6_set_checksum();

	/* setup global in6_addr, allspf6 and alldr6 for later use */
	inet_pton(AF_INET6, ALLSPFROUTERS6, &allspfrouters6);
	inet_pton(AF_INET6, ALLDROUTERS6, &alldrouters6);

	return 0;
}

/* ospf6 set socket option */
int ospf6_sso(ifindex_t ifindex, struct in6_addr *group, int option)
{
	struct ipv6_mreq mreq6;
	int ret;
	int bufsize = (8 * 1024 * 1024);

	assert(ifindex);
	mreq6.ipv6mr_interface = ifindex;
	memcpy(&mreq6.ipv6mr_multiaddr, group, sizeof(struct in6_addr));

	ret = setsockopt(ospf6_sock, IPPROTO_IPV6, option, &mreq6,
			 sizeof(mreq6));
	if (ret < 0) {
		zlog_err("Network: setsockopt (%d) on ifindex %d failed: %s",
			 option, ifindex, safe_strerror(errno));
		return ret;
	}

	setsockopt_so_sendbuf(ospf6_sock, bufsize);
	setsockopt_so_recvbuf(ospf6_sock, bufsize);

	return 0;
}

static int iov_count(struct iovec *iov)
{
	int i;
	for (i = 0; iov[i].iov_base; i++)
		;
	return i;
}

static int iov_totallen(struct iovec *iov)
{
	int i;
	int totallen = 0;
	for (i = 0; iov[i].iov_base; i++)
		totallen += iov[i].iov_len;
	return totallen;
}

int ospf6_sendmsg(struct in6_addr *src, struct in6_addr *dst,
		  ifindex_t *ifindex, struct iovec *message)
{
	int retval;
	struct msghdr smsghdr;
	struct cmsghdr *scmsgp;
	union {
		struct cmsghdr hdr;
		u_char buf[CMSG_SPACE(sizeof(struct in6_pktinfo))];
	} cmsgbuf;
	struct in6_pktinfo *pktinfo;
	struct sockaddr_in6 dst_sin6;

	assert(dst);
	assert(*ifindex);

	scmsgp = (struct cmsghdr *)&cmsgbuf;
	pktinfo = (struct in6_pktinfo *)(CMSG_DATA(scmsgp));
	memset(&dst_sin6, 0, sizeof(struct sockaddr_in6));

	/* source address */
	pktinfo->ipi6_ifindex = *ifindex;
	if (src)
		memcpy(&pktinfo->ipi6_addr, src, sizeof(struct in6_addr));
	else
		memset(&pktinfo->ipi6_addr, 0, sizeof(struct in6_addr));

	/* destination address */
	dst_sin6.sin6_family = AF_INET6;
#ifdef SIN6_LEN
	dst_sin6.sin6_len = sizeof(struct sockaddr_in6);
#endif /*SIN6_LEN*/
	memcpy(&dst_sin6.sin6_addr, dst, sizeof(struct in6_addr));
	dst_sin6.sin6_scope_id = *ifindex;

	/* send control msg */
	scmsgp->cmsg_level = IPPROTO_IPV6;
	scmsgp->cmsg_type = IPV6_PKTINFO;
	scmsgp->cmsg_len = CMSG_LEN(sizeof(struct in6_pktinfo));
	/* scmsgp = CMSG_NXTHDR (&smsghdr, scmsgp); */

	/* send msg hdr */
	memset(&smsghdr, 0, sizeof(smsghdr));
	smsghdr.msg_iov = message;
	smsghdr.msg_iovlen = iov_count(message);
	smsghdr.msg_name = (caddr_t)&dst_sin6;
	smsghdr.msg_namelen = sizeof(struct sockaddr_in6);
	smsghdr.msg_control = (caddr_t)&cmsgbuf.buf;
	smsghdr.msg_controllen = sizeof(cmsgbuf.buf);

	retval = sendmsg(ospf6_sock, &smsghdr, 0);
	if (retval != iov_totallen(message))
		zlog_warn("sendmsg failed: ifindex: %d: %s (%d)", *ifindex,
			  safe_strerror(errno), errno);

	return retval;
}

int ospf6_recvmsg(struct in6_addr *src, struct in6_addr *dst,
		  ifindex_t *ifindex, struct iovec *message)
{
	int retval;
	struct msghdr rmsghdr;
	struct cmsghdr *rcmsgp;
	u_char cmsgbuf[CMSG_SPACE(sizeof(struct in6_pktinfo))];
	struct in6_pktinfo *pktinfo;
	struct sockaddr_in6 src_sin6;

	rcmsgp = (struct cmsghdr *)cmsgbuf;
	pktinfo = (struct in6_pktinfo *)(CMSG_DATA(rcmsgp));
	memset(&src_sin6, 0, sizeof(struct sockaddr_in6));

	/* receive control msg */
	rcmsgp->cmsg_level = IPPROTO_IPV6;
	rcmsgp->cmsg_type = IPV6_PKTINFO;
	rcmsgp->cmsg_len = CMSG_LEN(sizeof(struct in6_pktinfo));
	/* rcmsgp = CMSG_NXTHDR (&rmsghdr, rcmsgp); */

	/* receive msg hdr */
	memset(&rmsghdr, 0, sizeof(rmsghdr));
	rmsghdr.msg_iov = message;
	rmsghdr.msg_iovlen = iov_count(message);
	rmsghdr.msg_name = (caddr_t)&src_sin6;
	rmsghdr.msg_namelen = sizeof(struct sockaddr_in6);
	rmsghdr.msg_control = (caddr_t)cmsgbuf;
	rmsghdr.msg_controllen = sizeof(cmsgbuf);

	retval = recvmsg(ospf6_sock, &rmsghdr, 0);
	if (retval < 0)
		zlog_warn("recvmsg failed: %s", safe_strerror(errno));
	else if (retval == iov_totallen(message))
		zlog_warn("recvmsg read full buffer size: %d", retval);

	/* source address */
	assert(src);
	memcpy(src, &src_sin6.sin6_addr, sizeof(struct in6_addr));

	/* destination address */
	if (ifindex)
		*ifindex = pktinfo->ipi6_ifindex;
	if (dst)
		memcpy(dst, &pktinfo->ipi6_addr, sizeof(struct in6_addr));

	return retval;
}
Commit	Line	Data
718e3744	1	/*
508e53e2	2	* Copyright (C) 2003 Yasuhiro Ohara
718e3744	3	*
	4	* This file is part of GNU Zebra.
	5	*
	6	* GNU Zebra is free software; you can redistribute it and/or modify it
	7	* under the terms of the GNU General Public License as published by the
	8	* Free Software Foundation; either version 2, or (at your option) any
	9	* later version.
	10	*
	11	* GNU Zebra is distributed in the hope that it will be useful, but
	12	* WITHOUT ANY WARRANTY; without even the implied warranty of
	13	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
	14	* General Public License for more details.
	15	*
896014f4 DL	16	* You should have received a copy of the GNU General Public License along
	17	* with this program; see the file COPYING; if not, write to the Free Software
	18	* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
718e3744	19	*/
	20
	21	#include <zebra.h>
508e53e2	22
718e3744	23	#include "log.h"
508e53e2	24	#include "memory.h"
718e3744	25	#include "sockunion.h"
03d52f8d	26	#include "sockopt.h"
edd7c245	27	#include "privs.h"
718e3744	28
8551e6da	29	#include "libospf.h"
718e3744	30	#include "ospf6_proto.h"
508e53e2	31	#include "ospf6_network.h"
718e3744	32
edd7c245	33	extern struct zebra_privs_t ospf6d_privs;
718e3744	34
d62a17ae	35	int ospf6_sock;
508e53e2	36	struct in6_addr allspfrouters6;
508e53e2	37	struct in6_addr alldrouters6;
718e3744	38
508e53e2	39	/* setsockopt MulticastLoop to off */
d62a17ae	40	static void ospf6_reset_mcastloop(void)
718e3744	41	{
d62a17ae	42	u_int off = 0;
	43	if (setsockopt(ospf6_sock, IPPROTO_IPV6, IPV6_MULTICAST_LOOP, &off,
	44	sizeof(u_int))
	45	< 0)
	46	zlog_warn("Network: reset IPV6_MULTICAST_LOOP failed: %s",
	47	safe_strerror(errno));
718e3744	48	}
718e3744	49
d62a17ae	50	static void ospf6_set_pktinfo(void)
718e3744	51	{
d62a17ae	52	setsockopt_ipv6_pktinfo(ospf6_sock, 1);
718e3744	53	}
718e3744	54
d62a17ae	55	static void ospf6_set_transport_class(void)
6d0732c8 SH	56	{
6d0732c8 SH	57	#ifdef IPTOS_PREC_INTERNETCONTROL
d62a17ae	58	setsockopt_ipv6_tclass(ospf6_sock, IPTOS_PREC_INTERNETCONTROL);
6d0732c8 SH	59	#endif
	60	}
	61
d62a17ae	62	static void ospf6_set_checksum(void)
718e3744	63	{
d62a17ae	64	int offset = 12;
508e53e2	65	#ifndef DISABLE_IPV6_CHECKSUM
d62a17ae	66	if (setsockopt(ospf6_sock, IPPROTO_IPV6, IPV6_CHECKSUM, &offset,
	67	sizeof(offset))
	68	< 0)
	69	zlog_warn("Network: set IPV6_CHECKSUM failed: %s",
	70	safe_strerror(errno));
508e53e2	71	#else
d62a17ae	72	zlog_warn("Network: Don't set IPV6_CHECKSUM");
508e53e2	73	#endif /* DISABLE_IPV6_CHECKSUM */
718e3744	74	}
718e3744	75
718e3744	76	/* Make ospf6d's server socket. */
d62a17ae	77	int ospf6_serv_sock(void)
718e3744	78	{
d62a17ae	79	if (ospf6d_privs.change(ZPRIVS_RAISE))
	80	zlog_err("ospf6_serv_sock: could not raise privs");
	81
	82	ospf6_sock = socket(AF_INET6, SOCK_RAW, IPPROTO_OSPFIGP);
	83	if (ospf6_sock < 0) {
	84	zlog_warn("Network: can't create OSPF6 socket.");
	85	if (ospf6d_privs.change(ZPRIVS_LOWER))
	86	zlog_err("ospf_sock_init: could not lower privs");
	87	return -1;
	88	}
	89	if (ospf6d_privs.change(ZPRIVS_LOWER))
	90	zlog_err("ospf_sock_init: could not lower privs");
	91
	92	/* set socket options */
508e53e2	93	#if 1
d62a17ae	94	sockopt_reuseaddr(ospf6_sock);
508e53e2	95	#else
d62a17ae	96	ospf6_set_reuseaddr();
508e53e2	97	#endif /1/
d62a17ae	98	ospf6_reset_mcastloop();
	99	ospf6_set_pktinfo();
	100	ospf6_set_transport_class();
	101	ospf6_set_checksum();
508e53e2	102
d62a17ae	103	/* setup global in6_addr, allspf6 and alldr6 for later use */
	104	inet_pton(AF_INET6, ALLSPFROUTERS6, &allspfrouters6);
	105	inet_pton(AF_INET6, ALLDROUTERS6, &alldrouters6);
718e3744	106
d62a17ae	107	return 0;
718e3744	108	}
718e3744	109
9a9446ea	110	/* ospf6 set socket option */
d62a17ae	111	int ospf6_sso(ifindex_t ifindex, struct in6_addr *group, int option)
718e3744	112	{
d62a17ae	113	struct ipv6_mreq mreq6;
	114	int ret;
	115	int bufsize = (8 * 1024 * 1024);
	116
	117	assert(ifindex);
	118	mreq6.ipv6mr_interface = ifindex;
	119	memcpy(&mreq6.ipv6mr_multiaddr, group, sizeof(struct in6_addr));
	120
	121	ret = setsockopt(ospf6_sock, IPPROTO_IPV6, option, &mreq6,
	122	sizeof(mreq6));
	123	if (ret < 0) {
	124	zlog_err("Network: setsockopt (%d) on ifindex %d failed: %s",
	125	option, ifindex, safe_strerror(errno));
	126	return ret;
	127	}
	128
	129	setsockopt_so_sendbuf(ospf6_sock, bufsize);
	130	setsockopt_so_recvbuf(ospf6_sock, bufsize);
	131
	132	return 0;
718e3744	133	}
718e3744	134
d62a17ae	135	static int iov_count(struct iovec *iov)
718e3744	136	{
d62a17ae	137	int i;
	138	for (i = 0; iov[i].iov_base; i++)
	139	;
	140	return i;
718e3744	141	}
718e3744	142
d62a17ae	143	static int iov_totallen(struct iovec *iov)
718e3744	144	{
d62a17ae	145	int i;
	146	int totallen = 0;
	147	for (i = 0; iov[i].iov_base; i++)
	148	totallen += iov[i].iov_len;
	149	return totallen;
718e3744	150	}
718e3744	151
d62a17ae	152	int ospf6_sendmsg(struct in6_addr src, struct in6_addr dst,
d62a17ae	153	ifindex_t ifindex, struct iovec message)
718e3744	154	{
d62a17ae	155	int retval;
	156	struct msghdr smsghdr;
	157	struct cmsghdr *scmsgp;
	158	union {
	159	struct cmsghdr hdr;
	160	u_char buf[CMSG_SPACE(sizeof(struct in6_pktinfo))];
	161	} cmsgbuf;
	162	struct in6_pktinfo *pktinfo;
	163	struct sockaddr_in6 dst_sin6;
	164
	165	assert(dst);
	166	assert(*ifindex);
	167
	168	scmsgp = (struct cmsghdr *)&cmsgbuf;
	169	pktinfo = (struct in6_pktinfo *)(CMSG_DATA(scmsgp));
	170	memset(&dst_sin6, 0, sizeof(struct sockaddr_in6));
	171
	172	/* source address */
	173	pktinfo->ipi6_ifindex = *ifindex;
	174	if (src)
	175	memcpy(&pktinfo->ipi6_addr, src, sizeof(struct in6_addr));
	176	else
	177	memset(&pktinfo->ipi6_addr, 0, sizeof(struct in6_addr));
	178
	179	/* destination address */
	180	dst_sin6.sin6_family = AF_INET6;
718e3744	181	#ifdef SIN6_LEN
d62a17ae	182	dst_sin6.sin6_len = sizeof(struct sockaddr_in6);
718e3744	183	#endif /SIN6_LEN/
d62a17ae	184	memcpy(&dst_sin6.sin6_addr, dst, sizeof(struct in6_addr));
	185	dst_sin6.sin6_scope_id = *ifindex;
	186
	187	/* send control msg */
	188	scmsgp->cmsg_level = IPPROTO_IPV6;
	189	scmsgp->cmsg_type = IPV6_PKTINFO;
	190	scmsgp->cmsg_len = CMSG_LEN(sizeof(struct in6_pktinfo));
	191	/* scmsgp = CMSG_NXTHDR (&smsghdr, scmsgp); */
	192
	193	/* send msg hdr */
	194	memset(&smsghdr, 0, sizeof(smsghdr));
	195	smsghdr.msg_iov = message;
	196	smsghdr.msg_iovlen = iov_count(message);
	197	smsghdr.msg_name = (caddr_t)&dst_sin6;
	198	smsghdr.msg_namelen = sizeof(struct sockaddr_in6);
	199	smsghdr.msg_control = (caddr_t)&cmsgbuf.buf;
	200	smsghdr.msg_controllen = sizeof(cmsgbuf.buf);
	201
	202	retval = sendmsg(ospf6_sock, &smsghdr, 0);
	203	if (retval != iov_totallen(message))
	204	zlog_warn("sendmsg failed: ifindex: %d: %s (%d)", *ifindex,
	205	safe_strerror(errno), errno);
	206
	207	return retval;
718e3744	208	}
718e3744	209
d62a17ae	210	int ospf6_recvmsg(struct in6_addr src, struct in6_addr dst,
d62a17ae	211	ifindex_t ifindex, struct iovec message)
718e3744	212	{
d62a17ae	213	int retval;
	214	struct msghdr rmsghdr;
	215	struct cmsghdr *rcmsgp;
	216	u_char cmsgbuf[CMSG_SPACE(sizeof(struct in6_pktinfo))];
	217	struct in6_pktinfo *pktinfo;
	218	struct sockaddr_in6 src_sin6;
	219
	220	rcmsgp = (struct cmsghdr *)cmsgbuf;
	221	pktinfo = (struct in6_pktinfo *)(CMSG_DATA(rcmsgp));
	222	memset(&src_sin6, 0, sizeof(struct sockaddr_in6));
	223
	224	/* receive control msg */
	225	rcmsgp->cmsg_level = IPPROTO_IPV6;
	226	rcmsgp->cmsg_type = IPV6_PKTINFO;
	227	rcmsgp->cmsg_len = CMSG_LEN(sizeof(struct in6_pktinfo));
	228	/* rcmsgp = CMSG_NXTHDR (&rmsghdr, rcmsgp); */
	229
	230	/* receive msg hdr */
	231	memset(&rmsghdr, 0, sizeof(rmsghdr));
	232	rmsghdr.msg_iov = message;
	233	rmsghdr.msg_iovlen = iov_count(message);
	234	rmsghdr.msg_name = (caddr_t)&src_sin6;
	235	rmsghdr.msg_namelen = sizeof(struct sockaddr_in6);
	236	rmsghdr.msg_control = (caddr_t)cmsgbuf;
	237	rmsghdr.msg_controllen = sizeof(cmsgbuf);
	238
	239	retval = recvmsg(ospf6_sock, &rmsghdr, 0);
	240	if (retval < 0)
	241	zlog_warn("recvmsg failed: %s", safe_strerror(errno));
	242	else if (retval == iov_totallen(message))
	243	zlog_warn("recvmsg read full buffer size: %d", retval);
	244
	245	/* source address */
	246	assert(src);
	247	memcpy(src, &src_sin6.sin6_addr, sizeof(struct in6_addr));
	248
	249	/* destination address */
	250	if (ifindex)
	251	*ifindex = pktinfo->ipi6_ifindex;
	252	if (dst)
	253	memcpy(dst, &pktinfo->ipi6_addr, sizeof(struct in6_addr));
	254
	255	return retval;
718e3744	256	}