[mirror_frr.git] / ldpd / socket.c

/*	$OpenBSD$ */

/*
 * Copyright (c) 2016 Renato Westphal <renato@openbsd.org>
 * Copyright (c) 2009 Michele Marchetto <michele@openbsd.org>
 * Copyright (c) 2005 Claudio Jeker <claudio@openbsd.org>
 * Copyright (c) 2003, 2004 Henning Brauer <henning@openbsd.org>
 *
 * Permission to use, copy, modify, and distribute this software for any
 * purpose with or without fee is hereby granted, provided that the above
 * copyright notice and this permission notice appear in all copies.
 *
 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 */

#include <zebra.h>

#include "ldpd.h"
#include "ldpe.h"
#include "log.h"

#include "lib/log.h"
#include "privs.h"
#include "sockopt.h"

extern struct zebra_privs_t	 ldpd_privs;
extern struct zebra_privs_t	 ldpe_privs;

int
ldp_create_socket(int af, enum socket_type type)
{
	int			 fd, domain, proto;
	union ldpd_addr		 addr;
	union sockunion		 local_su;
#ifdef __OpenBSD__
	int			 opt;
#endif

	/* create socket */
	switch (type) {
	case LDP_SOCKET_DISC:
	case LDP_SOCKET_EDISC:
		domain = SOCK_DGRAM;
		proto = IPPROTO_UDP;
		break;
	case LDP_SOCKET_SESSION:
		domain = SOCK_STREAM;
		proto = IPPROTO_TCP;
		break;
	default:
		fatalx("ldp_create_socket: unknown socket type");
	}
	fd = socket(af, domain, proto);
	if (fd == -1) {
		log_warn("%s: error creating socket", __func__);
		return (-1);
	}
	sock_set_nonblock(fd);
	sockopt_v6only(af, fd);

	/* bind to a local address/port */
	switch (type) {
	case LDP_SOCKET_DISC:
		/* listen on all addresses */
		memset(&addr, 0, sizeof(addr));
		addr2sa(af, &addr, LDP_PORT, &local_su);
		break;
	case LDP_SOCKET_EDISC:
	case LDP_SOCKET_SESSION:
		addr = (ldp_af_conf_get(ldpd_conf, af))->trans_addr;
		addr2sa(af, &addr, LDP_PORT, &local_su);
		/* ignore any possible error */
		sock_set_bindany(fd, 1);
		break;
	}
	frr_elevate_privs(&ldpd_privs) {
		if (sock_set_reuse(fd, 1) == -1) {
			close(fd);
			return (-1);
		}
		if (bind(fd, &local_su.sa, sockaddr_len(&local_su.sa)) == -1) {
			log_warnx("%s: error binding socket: %s", __func__,
			    safe_strerror(errno));
			close(fd);
			return (-1);
		}
	}

	/* set options */
	switch (af) {
	case AF_INET:
		if (sock_set_ipv4_tos(fd, IPTOS_PREC_INTERNETCONTROL) == -1) {
			close(fd);
			return (-1);
		}
		if (type == LDP_SOCKET_DISC) {
			if (sock_set_ipv4_mcast_ttl(fd,
			    IP_DEFAULT_MULTICAST_TTL) == -1) {
				close(fd);
				return (-1);
			}
			if (sock_set_ipv4_mcast_loop(fd) == -1) {
				close(fd);
				return (-1);
			}
		}
		if (type == LDP_SOCKET_DISC || type == LDP_SOCKET_EDISC) {
			if (sock_set_ipv4_recvif(fd, 1) == -1) {
				close(fd);
				return (-1);
			}
#ifndef MSG_MCAST
#if defined(HAVE_IP_PKTINFO)
			if (sock_set_ipv4_pktinfo(fd, 1) == -1) {
				close(fd);
				return (-1);
			}
#elif defined(HAVE_IP_RECVDSTADDR)
			if (sock_set_ipv4_recvdstaddr(fd, 1) == -1) {
				close(fd);
				return (-1);
			}
#else
#error "Unsupported socket API"
#endif
#endif /* MSG_MCAST */
		}
		if (type == LDP_SOCKET_SESSION) {
			if (sock_set_ipv4_ucast_ttl(fd, 255) == -1) {
				close(fd);
				return (-1);
			}
		}
		break;
	case AF_INET6:
		if (sock_set_ipv6_dscp(fd, IPTOS_PREC_INTERNETCONTROL) == -1) {
			close(fd);
			return (-1);
		}
		if (type == LDP_SOCKET_DISC) {
			if (sock_set_ipv6_mcast_loop(fd) == -1) {
				close(fd);
				return (-1);
			}
			if (sock_set_ipv6_mcast_hops(fd, 255) == -1) {
				close(fd);
				return (-1);
			}
			if (!(ldpd_conf->ipv6.flags & F_LDPD_AF_NO_GTSM)) {
				/* ignore any possible error */
				sock_set_ipv6_minhopcount(fd, 255);
			}
		}
		if (type == LDP_SOCKET_DISC || type == LDP_SOCKET_EDISC) {
			if (sock_set_ipv6_pktinfo(fd, 1) == -1) {
				close(fd);
				return (-1);
			}
		}
		if (type == LDP_SOCKET_SESSION) {
			if (sock_set_ipv6_ucast_hops(fd, 255) == -1) {
				close(fd);
				return (-1);
			}
		}
		break;
	}
	switch (type) {
	case LDP_SOCKET_DISC:
	case LDP_SOCKET_EDISC:
		sock_set_recvbuf(fd);
		break;
	case LDP_SOCKET_SESSION:
		if (listen(fd, LDP_BACKLOG) == -1)
			log_warn("%s: error listening on socket", __func__);

#ifdef __OpenBSD__
		opt = 1;
		if (setsockopt(fd, IPPROTO_TCP, TCP_MD5SIG, &opt,
		    sizeof(opt)) == -1) {
			if (errno == ENOPROTOOPT) {	/* system w/o md5sig */
				log_warnx("md5sig not available, disabling");
				sysdep.no_md5sig = 1;
			} else {
				close(fd);
				return (-1);
			}
		}
#endif
		break;
	}

	return (fd);
}

void
sock_set_nonblock(int fd)
{
	int	flags;

	if ((flags = fcntl(fd, F_GETFL, 0)) == -1)
		fatal("fcntl F_GETFL");

	flags |= O_NONBLOCK;

	if ((flags = fcntl(fd, F_SETFL, flags)) == -1)
		fatal("fcntl F_SETFL");
}

void
sock_set_cloexec(int fd)
{
	int	flags;

	if ((flags = fcntl(fd, F_GETFD, 0)) == -1)
		fatal("fcntl F_GETFD");

	flags |= FD_CLOEXEC;

	if ((flags = fcntl(fd, F_SETFD, flags)) == -1)
		fatal("fcntl F_SETFD");
}

void
sock_set_recvbuf(int fd)
{
	int	bsize;

	bsize = 65535;
	while (setsockopt(fd, SOL_SOCKET, SO_RCVBUF, &bsize,
	    sizeof(bsize)) == -1)
		bsize /= 2;
}

int
sock_set_reuse(int fd, int enable)
{
	if (setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, &enable,
	    sizeof(int)) < 0) {
		log_warn("%s: error setting SO_REUSEADDR", __func__);
		return (-1);
	}

	return (0);
}

int
sock_set_bindany(int fd, int enable)
{
#ifdef HAVE_SO_BINDANY
	frr_elevate_privs(&ldpd_privs) {
		if (setsockopt(fd, SOL_SOCKET, SO_BINDANY, &enable,
			       sizeof(int)) < 0) {
			log_warn("%s: error setting SO_BINDANY", __func__);
			return (-1);
		}
	}
	return (0);
#elif defined(HAVE_IP_FREEBIND)
	if (setsockopt(fd, IPPROTO_IP, IP_FREEBIND, &enable, sizeof(int)) < 0) {
		log_warn("%s: error setting IP_FREEBIND", __func__);
		return (-1);
	}
	return (0);
#elif defined(IP_BINDANY)
	frr_elevate_privs(&ldpd_privs) {
		if (setsockopt(fd, IPPROTO_IP, IP_BINDANY, &enable, sizeof(int))
		    < 0) {
			log_warn("%s: error setting IP_BINDANY", __func__);
			return (-1);
		}
	}
#else
	log_warnx(
		"%s: missing SO_BINDANY, IP_FREEBIND and IP_BINDANY, unable to bind to a nonlocal IP address",
		__func__);
	return (-1);
#endif /* HAVE_SO_BINDANY */
}

#ifndef __OpenBSD__
/*
 * Set MD5 key for the socket, for the given peer address. If the password
 * is NULL or zero-length, the option will be disabled.
 */
int
sock_set_md5sig(int fd, int af, union ldpd_addr *addr, const char *password)
{
	int		 ret = -1;
	int		 save_errno = ENOSYS;
#if HAVE_DECL_TCP_MD5SIG
	union sockunion	 su;
#endif

	if (fd == -1)
		return (0);
#if HAVE_DECL_TCP_MD5SIG
	addr2sa(af, addr, 0, &su);

	frr_elevate_privs(&ldpe_privs) {
		ret = sockopt_tcp_signature(fd, &su, password);
		save_errno = errno;
	}
#endif /* HAVE_TCP_MD5SIG */
	if (ret < 0)
		log_warnx("%s: can't set TCP_MD5SIG option on fd %d: %s",
		    __func__, fd, safe_strerror(save_errno));

	return (ret);
}
#endif

int
sock_set_ipv4_tos(int fd, int tos)
{
	if (setsockopt(fd, IPPROTO_IP, IP_TOS, (int *)&tos, sizeof(tos)) < 0) {
		log_warn("%s: error setting IP_TOS to 0x%x", __func__, tos);
		return (-1);
	}

	return (0);
}

int
sock_set_ipv4_recvif(int fd, int enable)
{
	return (setsockopt_ifindex(AF_INET, fd, enable));
}

int
sock_set_ipv4_minttl(int fd, int ttl)
{
	return (sockopt_minttl(AF_INET, fd, ttl));
}

int
sock_set_ipv4_ucast_ttl(int fd, int ttl)
{
	if (setsockopt(fd, IPPROTO_IP, IP_TTL, &ttl, sizeof(ttl)) < 0) {
		log_warn("%s: error setting IP_TTL", __func__);
		return (-1);
	}

	return (0);
}

int
sock_set_ipv4_mcast_ttl(int fd, uint8_t ttl)
{
	if (setsockopt(fd, IPPROTO_IP, IP_MULTICAST_TTL,
	    (char *)&ttl, sizeof(ttl)) < 0) {
		log_warn("%s: error setting IP_MULTICAST_TTL to %d",
		    __func__, ttl);
		return (-1);
	}

	return (0);
}

#ifndef MSG_MCAST
#if defined(HAVE_IP_PKTINFO)
int
sock_set_ipv4_pktinfo(int fd, int enable)
{
	if (setsockopt(fd, IPPROTO_IP, IP_PKTINFO, &enable,
	    sizeof(enable)) < 0) {
		log_warn("%s: error setting IP_PKTINFO", __func__);
		return (-1);
	}

	return (0);
}
#elif defined(HAVE_IP_RECVDSTADDR)
int
sock_set_ipv4_recvdstaddr(int fd, int enable)
{
	if (setsockopt(fd, IPPROTO_IP, IP_RECVDSTADDR, &enable,
	    sizeof(enable)) < 0) {
		log_warn("%s: error setting IP_RECVDSTADDR", __func__);
		return (-1);
	}

	return (0);
}
#else
#error "Unsupported socket API"
#endif
#endif /* MSG_MCAST */

int
sock_set_ipv4_mcast(struct iface *iface)
{
	struct in_addr		 if_addr;

	if_addr.s_addr = if_get_ipv4_addr(iface);

	if (setsockopt_ipv4_multicast_if(global.ipv4.ldp_disc_socket,
	    if_addr, iface->ifindex) < 0) {
		log_warn("%s: error setting IP_MULTICAST_IF, interface %s",
		    __func__, iface->name);
		return (-1);
	}

	return (0);
}

int
sock_set_ipv4_mcast_loop(int fd)
{
	return (setsockopt_ipv4_multicast_loop(fd, 0));
}

int
sock_set_ipv6_dscp(int fd, int dscp)
{
	if (setsockopt(fd, IPPROTO_IPV6, IPV6_TCLASS, &dscp,
	    sizeof(dscp)) < 0) {
		log_warn("%s: error setting IPV6_TCLASS", __func__);
		return (-1);
	}

	return (0);
}

int
sock_set_ipv6_pktinfo(int fd, int enable)
{
	if (setsockopt(fd, IPPROTO_IPV6, IPV6_RECVPKTINFO, &enable,
	    sizeof(enable)) < 0) {
		log_warn("%s: error setting IPV6_RECVPKTINFO", __func__);
		return (-1);
	}

	return (0);
}

int
sock_set_ipv6_minhopcount(int fd, int hoplimit)
{
	return (sockopt_minttl(AF_INET6, fd, hoplimit));
}

int
sock_set_ipv6_ucast_hops(int fd, int hoplimit)
{
	if (setsockopt(fd, IPPROTO_IPV6, IPV6_UNICAST_HOPS,
	    &hoplimit, sizeof(hoplimit)) < 0) {
		log_warn("%s: error setting IPV6_UNICAST_HOPS", __func__);
		return (-1);
	}

	return (0);
}

int
sock_set_ipv6_mcast_hops(int fd, int hoplimit)
{
	if (setsockopt(fd, IPPROTO_IPV6, IPV6_MULTICAST_HOPS,
	    &hoplimit, sizeof(hoplimit)) < 0) {
		log_warn("%s: error setting IPV6_MULTICAST_HOPS", __func__);
		return (-1);
	}

	return (0);
}

int
sock_set_ipv6_mcast(struct iface *iface)
{
	if (setsockopt(global.ipv6.ldp_disc_socket, IPPROTO_IPV6,
	    IPV6_MULTICAST_IF, &iface->ifindex, sizeof(iface->ifindex)) < 0) {
		log_warn("%s: error setting IPV6_MULTICAST_IF, interface %s",
		    __func__, iface->name);
		return (-1);
	}

	return (0);
}

int
sock_set_ipv6_mcast_loop(int fd)
{
	unsigned int	loop = 0;

	if (setsockopt(fd, IPPROTO_IPV6, IPV6_MULTICAST_LOOP,
	    &loop, sizeof(loop)) < 0) {
		log_warn("%s: error setting IPV6_MULTICAST_LOOP", __func__);
		return (-1);
	}

	return (0);
}
Commit	Line	Data
8429abe0 RW	1	/* $OpenBSD$ */
	2
	3	/*
	4	* Copyright (c) 2016 Renato Westphal <renato@openbsd.org>
	5	* Copyright (c) 2009 Michele Marchetto <michele@openbsd.org>
	6	* Copyright (c) 2005 Claudio Jeker <claudio@openbsd.org>
	7	* Copyright (c) 2003, 2004 Henning Brauer <henning@openbsd.org>
	8	*
	9	* Permission to use, copy, modify, and distribute this software for any
	10	* purpose with or without fee is hereby granted, provided that the above
	11	* copyright notice and this permission notice appear in all copies.
	12	*
	13	* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
	14	* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
	15	* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
	16	* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
	17	* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
	18	* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
	19	* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
	20	*/
	21
eac6e3f0	22	#include <zebra.h>
8429abe0 RW	23
	24	#include "ldpd.h"
	25	#include "ldpe.h"
	26	#include "log.h"
	27
eac6e3f0 RW	28	#include "lib/log.h"
	29	#include "privs.h"
	30	#include "sockopt.h"
	31
	32	extern struct zebra_privs_t ldpd_privs;
	33	extern struct zebra_privs_t ldpe_privs;
	34
8429abe0 RW	35	int
	36	ldp_create_socket(int af, enum socket_type type)
	37	{
	38	int fd, domain, proto;
	39	union ldpd_addr addr;
4149ef7c	40	union sockunion local_su;
eac6e3f0	41	#ifdef __OpenBSD__
8429abe0	42	int opt;
eac6e3f0	43	#endif
8429abe0 RW	44
	45	/* create socket */
	46	switch (type) {
	47	case LDP_SOCKET_DISC:
	48	case LDP_SOCKET_EDISC:
	49	domain = SOCK_DGRAM;
	50	proto = IPPROTO_UDP;
	51	break;
	52	case LDP_SOCKET_SESSION:
	53	domain = SOCK_STREAM;
	54	proto = IPPROTO_TCP;
	55	break;
	56	default:
	57	fatalx("ldp_create_socket: unknown socket type");
	58	}
eac6e3f0	59	fd = socket(af, domain, proto);
8429abe0 RW	60	if (fd == -1) {
	61	log_warn("%s: error creating socket", __func__);
	62	return (-1);
	63	}
eac6e3f0 RW	64	sock_set_nonblock(fd);
eac6e3f0 RW	65	sockopt_v6only(af, fd);
8429abe0 RW	66
	67	/* bind to a local address/port */
	68	switch (type) {
	69	case LDP_SOCKET_DISC:
	70	/* listen on all addresses */
	71	memset(&addr, 0, sizeof(addr));
4149ef7c	72	addr2sa(af, &addr, LDP_PORT, &local_su);
8429abe0 RW	73	break;
	74	case LDP_SOCKET_EDISC:
	75	case LDP_SOCKET_SESSION:
	76	addr = (ldp_af_conf_get(ldpd_conf, af))->trans_addr;
4149ef7c	77	addr2sa(af, &addr, LDP_PORT, &local_su);
eac6e3f0 RW	78	/* ignore any possible error */
eac6e3f0 RW	79	sock_set_bindany(fd, 1);
8429abe0 RW	80	break;
8429abe0 RW	81	}
6bb30c2c DL	82	frr_elevate_privs(&ldpd_privs) {
	83	if (sock_set_reuse(fd, 1) == -1) {
	84	close(fd);
	85	return (-1);
	86	}
	87	if (bind(fd, &local_su.sa, sockaddr_len(&local_su.sa)) == -1) {
	88	log_warnx("%s: error binding socket: %s", __func__,
	89	safe_strerror(errno));
	90	close(fd);
	91	return (-1);
	92	}
8429abe0 RW	93	}
	94
	95	/* set options */
	96	switch (af) {
	97	case AF_INET:
	98	if (sock_set_ipv4_tos(fd, IPTOS_PREC_INTERNETCONTROL) == -1) {
	99	close(fd);
	100	return (-1);
	101	}
	102	if (type == LDP_SOCKET_DISC) {
	103	if (sock_set_ipv4_mcast_ttl(fd,
	104	IP_DEFAULT_MULTICAST_TTL) == -1) {
	105	close(fd);
	106	return (-1);
	107	}
	108	if (sock_set_ipv4_mcast_loop(fd) == -1) {
	109	close(fd);
	110	return (-1);
	111	}
	112	}
	113	if (type == LDP_SOCKET_DISC \|\| type == LDP_SOCKET_EDISC) {
	114	if (sock_set_ipv4_recvif(fd, 1) == -1) {
	115	close(fd);
	116	return (-1);
	117	}
eac6e3f0 RW	118	#ifndef MSG_MCAST
	119	#if defined(HAVE_IP_PKTINFO)
	120	if (sock_set_ipv4_pktinfo(fd, 1) == -1) {
	121	close(fd);
	122	return (-1);
	123	}
	124	#elif defined(HAVE_IP_RECVDSTADDR)
	125	if (sock_set_ipv4_recvdstaddr(fd, 1) == -1) {
	126	close(fd);
	127	return (-1);
	128	}
	129	#else
	130	#error "Unsupported socket API"
	131	#endif
	132	#endif /* MSG_MCAST */
8429abe0 RW	133	}
	134	if (type == LDP_SOCKET_SESSION) {
	135	if (sock_set_ipv4_ucast_ttl(fd, 255) == -1) {
	136	close(fd);
	137	return (-1);
	138	}
	139	}
	140	break;
	141	case AF_INET6:
	142	if (sock_set_ipv6_dscp(fd, IPTOS_PREC_INTERNETCONTROL) == -1) {
	143	close(fd);
	144	return (-1);
	145	}
	146	if (type == LDP_SOCKET_DISC) {
	147	if (sock_set_ipv6_mcast_loop(fd) == -1) {
	148	close(fd);
	149	return (-1);
	150	}
	151	if (sock_set_ipv6_mcast_hops(fd, 255) == -1) {
	152	close(fd);
	153	return (-1);
	154	}
	155	if (!(ldpd_conf->ipv6.flags & F_LDPD_AF_NO_GTSM)) {
eac6e3f0 RW	156	/* ignore any possible error */
eac6e3f0 RW	157	sock_set_ipv6_minhopcount(fd, 255);
8429abe0 RW	158	}
	159	}
	160	if (type == LDP_SOCKET_DISC \|\| type == LDP_SOCKET_EDISC) {
	161	if (sock_set_ipv6_pktinfo(fd, 1) == -1) {
	162	close(fd);
	163	return (-1);
	164	}
	165	}
	166	if (type == LDP_SOCKET_SESSION) {
	167	if (sock_set_ipv6_ucast_hops(fd, 255) == -1) {
	168	close(fd);
	169	return (-1);
	170	}
	171	}
	172	break;
	173	}
	174	switch (type) {
	175	case LDP_SOCKET_DISC:
	176	case LDP_SOCKET_EDISC:
	177	sock_set_recvbuf(fd);
	178	break;
	179	case LDP_SOCKET_SESSION:
	180	if (listen(fd, LDP_BACKLOG) == -1)
	181	log_warn("%s: error listening on socket", __func__);
	182
eac6e3f0	183	#ifdef __OpenBSD__
8429abe0 RW	184	opt = 1;
	185	if (setsockopt(fd, IPPROTO_TCP, TCP_MD5SIG, &opt,
	186	sizeof(opt)) == -1) {
	187	if (errno == ENOPROTOOPT) { /* system w/o md5sig */
	188	log_warnx("md5sig not available, disabling");
	189	sysdep.no_md5sig = 1;
	190	} else {
	191	close(fd);
	192	return (-1);
	193	}
	194	}
eac6e3f0	195	#endif
8429abe0 RW	196	break;
	197	}
	198
	199	return (fd);
	200	}
	201
eac6e3f0 RW	202	void
	203	sock_set_nonblock(int fd)
	204	{
	205	int flags;
	206
	207	if ((flags = fcntl(fd, F_GETFL, 0)) == -1)
	208	fatal("fcntl F_GETFL");
	209
	210	flags \|= O_NONBLOCK;
	211
	212	if ((flags = fcntl(fd, F_SETFL, flags)) == -1)
	213	fatal("fcntl F_SETFL");
	214	}
	215
	216	void
	217	sock_set_cloexec(int fd)
	218	{
	219	int flags;
	220
	221	if ((flags = fcntl(fd, F_GETFD, 0)) == -1)
	222	fatal("fcntl F_GETFD");
	223
	224	flags \|= FD_CLOEXEC;
	225
	226	if ((flags = fcntl(fd, F_SETFD, flags)) == -1)
	227	fatal("fcntl F_SETFD");
	228	}
	229
8429abe0 RW	230	void
	231	sock_set_recvbuf(int fd)
	232	{
	233	int bsize;
	234
	235	bsize = 65535;
	236	while (setsockopt(fd, SOL_SOCKET, SO_RCVBUF, &bsize,
	237	sizeof(bsize)) == -1)
	238	bsize /= 2;
	239	}
	240
	241	int
	242	sock_set_reuse(int fd, int enable)
	243	{
	244	if (setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, &enable,
	245	sizeof(int)) < 0) {
	246	log_warn("%s: error setting SO_REUSEADDR", __func__);
	247	return (-1);
	248	}
	249
	250	return (0);
	251	}
	252
	253	int
	254	sock_set_bindany(int fd, int enable)
	255	{
eac6e3f0	256	#ifdef HAVE_SO_BINDANY
01b9e3fd DL	257	frr_elevate_privs(&ldpd_privs) {
	258	if (setsockopt(fd, SOL_SOCKET, SO_BINDANY, &enable,
	259	sizeof(int)) < 0) {
	260	log_warn("%s: error setting SO_BINDANY", __func__);
	261	return (-1);
	262	}
8429abe0	263	}
eac6e3f0 RW	264	return (0);
	265	#elif defined(HAVE_IP_FREEBIND)
	266	if (setsockopt(fd, IPPROTO_IP, IP_FREEBIND, &enable, sizeof(int)) < 0) {
	267	log_warn("%s: error setting IP_FREEBIND", __func__);
	268	return (-1);
	269	}
8429abe0	270	return (0);
1ef00571 RZ	271	#elif defined(IP_BINDANY)
	272	frr_elevate_privs(&ldpd_privs) {
	273	if (setsockopt(fd, IPPROTO_IP, IP_BINDANY, &enable, sizeof(int))
	274	< 0) {
	275	log_warn("%s: error setting IP_BINDANY", __func__);
	276	return (-1);
	277	}
	278	}
eac6e3f0	279	#else
1ef00571 RZ	280	log_warnx(
	281	"%s: missing SO_BINDANY, IP_FREEBIND and IP_BINDANY, unable to bind to a nonlocal IP address",
	282	__func__);
eac6e3f0 RW	283	return (-1);
	284	#endif /* HAVE_SO_BINDANY */
	285	}
	286
	287	#ifndef __OpenBSD__
	288	/*
	289	* Set MD5 key for the socket, for the given peer address. If the password
	290	* is NULL or zero-length, the option will be disabled.
	291	*/
	292	int
	293	sock_set_md5sig(int fd, int af, union ldpd_addr addr, const char password)
	294	{
	295	int ret = -1;
	296	int save_errno = ENOSYS;
	297	#if HAVE_DECL_TCP_MD5SIG
	298	union sockunion su;
	299	#endif
	300
	301	if (fd == -1)
	302	return (0);
	303	#if HAVE_DECL_TCP_MD5SIG
4149ef7c	304	addr2sa(af, addr, 0, &su);
eac6e3f0	305
6bb30c2c DL	306	frr_elevate_privs(&ldpe_privs) {
	307	ret = sockopt_tcp_signature(fd, &su, password);
	308	save_errno = errno;
eac6e3f0	309	}
eac6e3f0 RW	310	#endif /* HAVE_TCP_MD5SIG */
	311	if (ret < 0)
	312	log_warnx("%s: can't set TCP_MD5SIG option on fd %d: %s",
	313	__func__, fd, safe_strerror(save_errno));
	314
	315	return (ret);
8429abe0	316	}
eac6e3f0	317	#endif
8429abe0 RW	318
	319	int
	320	sock_set_ipv4_tos(int fd, int tos)
	321	{
	322	if (setsockopt(fd, IPPROTO_IP, IP_TOS, (int *)&tos, sizeof(tos)) < 0) {
	323	log_warn("%s: error setting IP_TOS to 0x%x", __func__, tos);
	324	return (-1);
	325	}
	326
	327	return (0);
	328	}
	329
	330	int
	331	sock_set_ipv4_recvif(int fd, int enable)
	332	{
eac6e3f0	333	return (setsockopt_ifindex(AF_INET, fd, enable));
8429abe0 RW	334	}
	335
	336	int
	337	sock_set_ipv4_minttl(int fd, int ttl)
	338	{
eac6e3f0	339	return (sockopt_minttl(AF_INET, fd, ttl));
8429abe0 RW	340	}
	341
	342	int
	343	sock_set_ipv4_ucast_ttl(int fd, int ttl)
	344	{
	345	if (setsockopt(fd, IPPROTO_IP, IP_TTL, &ttl, sizeof(ttl)) < 0) {
	346	log_warn("%s: error setting IP_TTL", __func__);
	347	return (-1);
	348	}
	349
	350	return (0);
	351	}
	352
	353	int
	354	sock_set_ipv4_mcast_ttl(int fd, uint8_t ttl)
	355	{
	356	if (setsockopt(fd, IPPROTO_IP, IP_MULTICAST_TTL,
	357	(char *)&ttl, sizeof(ttl)) < 0) {
	358	log_warn("%s: error setting IP_MULTICAST_TTL to %d",
	359	__func__, ttl);
	360	return (-1);
	361	}
	362
	363	return (0);
	364	}
	365
eac6e3f0 RW	366	#ifndef MSG_MCAST
	367	#if defined(HAVE_IP_PKTINFO)
	368	int
	369	sock_set_ipv4_pktinfo(int fd, int enable)
	370	{
	371	if (setsockopt(fd, IPPROTO_IP, IP_PKTINFO, &enable,
	372	sizeof(enable)) < 0) {
	373	log_warn("%s: error setting IP_PKTINFO", __func__);
	374	return (-1);
	375	}
	376
	377	return (0);
	378	}
	379	#elif defined(HAVE_IP_RECVDSTADDR)
	380	int
	381	sock_set_ipv4_recvdstaddr(int fd, int enable)
	382	{
	383	if (setsockopt(fd, IPPROTO_IP, IP_RECVDSTADDR, &enable,
	384	sizeof(enable)) < 0) {
	385	log_warn("%s: error setting IP_RECVDSTADDR", __func__);
	386	return (-1);
	387	}
	388
	389	return (0);
	390	}
	391	#else
	392	#error "Unsupported socket API"
	393	#endif
	394	#endif /* MSG_MCAST */
	395
8429abe0 RW	396	int
	397	sock_set_ipv4_mcast(struct iface *iface)
	398	{
eac6e3f0	399	struct in_addr if_addr;
8429abe0	400
eac6e3f0	401	if_addr.s_addr = if_get_ipv4_addr(iface);
8429abe0	402
eac6e3f0 RW	403	if (setsockopt_ipv4_multicast_if(global.ipv4.ldp_disc_socket,
eac6e3f0 RW	404	if_addr, iface->ifindex) < 0) {
8429abe0 RW	405	log_warn("%s: error setting IP_MULTICAST_IF, interface %s",
	406	__func__, iface->name);
	407	return (-1);
	408	}
	409
	410	return (0);
	411	}
	412
	413	int
	414	sock_set_ipv4_mcast_loop(int fd)
	415	{
c5bdb09f	416	return (setsockopt_ipv4_multicast_loop(fd, 0));
8429abe0 RW	417	}
	418
	419	int
	420	sock_set_ipv6_dscp(int fd, int dscp)
	421	{
	422	if (setsockopt(fd, IPPROTO_IPV6, IPV6_TCLASS, &dscp,
	423	sizeof(dscp)) < 0) {
	424	log_warn("%s: error setting IPV6_TCLASS", __func__);
	425	return (-1);
	426	}
	427
	428	return (0);
	429	}
	430
	431	int
	432	sock_set_ipv6_pktinfo(int fd, int enable)
	433	{
	434	if (setsockopt(fd, IPPROTO_IPV6, IPV6_RECVPKTINFO, &enable,
	435	sizeof(enable)) < 0) {
	436	log_warn("%s: error setting IPV6_RECVPKTINFO", __func__);
	437	return (-1);
	438	}
	439
	440	return (0);
	441	}
	442
	443	int
	444	sock_set_ipv6_minhopcount(int fd, int hoplimit)
	445	{
eac6e3f0	446	return (sockopt_minttl(AF_INET6, fd, hoplimit));
8429abe0 RW	447	}
	448
	449	int
	450	sock_set_ipv6_ucast_hops(int fd, int hoplimit)
	451	{
	452	if (setsockopt(fd, IPPROTO_IPV6, IPV6_UNICAST_HOPS,
	453	&hoplimit, sizeof(hoplimit)) < 0) {
	454	log_warn("%s: error setting IPV6_UNICAST_HOPS", __func__);
	455	return (-1);
	456	}
	457
	458	return (0);
	459	}
	460
	461	int
	462	sock_set_ipv6_mcast_hops(int fd, int hoplimit)
	463	{
	464	if (setsockopt(fd, IPPROTO_IPV6, IPV6_MULTICAST_HOPS,
	465	&hoplimit, sizeof(hoplimit)) < 0) {
	466	log_warn("%s: error setting IPV6_MULTICAST_HOPS", __func__);
	467	return (-1);
	468	}
	469
	470	return (0);
	471	}
	472
	473	int
	474	sock_set_ipv6_mcast(struct iface *iface)
	475	{
	476	if (setsockopt(global.ipv6.ldp_disc_socket, IPPROTO_IPV6,
	477	IPV6_MULTICAST_IF, &iface->ifindex, sizeof(iface->ifindex)) < 0) {
	478	log_warn("%s: error setting IPV6_MULTICAST_IF, interface %s",
	479	__func__, iface->name);
	480	return (-1);
	481	}
	482
	483	return (0);
	484	}
	485
	486	int
	487	sock_set_ipv6_mcast_loop(int fd)
	488	{
	489	unsigned int loop = 0;
	490
	491	if (setsockopt(fd, IPPROTO_IPV6, IPV6_MULTICAST_LOOP,
	492	&loop, sizeof(loop)) < 0) {
	493	log_warn("%s: error setting IPV6_MULTICAST_LOOP", __func__);
	494	return (-1);
	495	}
	496
	497	return (0);
	498	}