[mirror_frr.git] / pimd / pim_sock.c

/*
 * PIM for Quagga
 * Copyright (C) 2008  Everton da Silva Marques
 *
 * This program 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 of the License, or
 * (at your option) any later version.
 *
 * This program 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 <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <netinet/igmp.h>
#include <arpa/inet.h>
#include <unistd.h>
#include <netdb.h>
#include <errno.h>

#include "log.h"
#include "privs.h"
#include "if.h"
#include "vrf.h"
#include "sockopt.h"
#include "lib_errors.h"
#include "network.h"

#include "pimd.h"
#include "pim_instance.h"
#include "pim_mroute.h"
#include "pim_iface.h"
#include "pim_sock.h"
#include "pim_str.h"

#if PIM_IPV == 4
#define setsockopt_iptos setsockopt_ipv4_tos
#define setsockopt_multicast_loop setsockopt_ipv4_multicast_loop
#else
#define setsockopt_iptos setsockopt_ipv6_tclass
#define setsockopt_multicast_loop setsockopt_ipv6_multicast_loop
#endif

int pim_socket_raw(int protocol)
{
	int fd;

	frr_with_privs(&pimd_privs) {
		fd = socket(PIM_AF, SOCK_RAW, protocol);
	}

	if (fd < 0) {
		zlog_warn("Could not create raw socket: errno=%d: %s", errno,
			  safe_strerror(errno));
		return PIM_SOCK_ERR_SOCKET;
	}

	return fd;
}

void pim_socket_ip_hdr(int fd)
{
	frr_with_privs(&pimd_privs) {
#if PIM_IPV == 4
		const int on = 1;

		if (setsockopt(fd, IPPROTO_IP, IP_HDRINCL, &on, sizeof(on)))
			zlog_err("%s: Could not turn on IP_HDRINCL option: %m",
				 __func__);
#endif
	}
}

/*
 * Given a socket and a interface,
 * Bind that socket to that interface
 */
int pim_socket_bind(int fd, struct interface *ifp)
{
	int ret = 0;

#ifdef SO_BINDTODEVICE
	frr_with_privs(&pimd_privs) {
		ret = setsockopt(fd, SOL_SOCKET, SO_BINDTODEVICE, ifp->name,
				 strlen(ifp->name));
	}
#endif
	return ret;
}

#if PIM_IPV == 4
static inline int pim_setsockopt(int protocol, int fd, struct interface *ifp)
{
	int one = 1;
	int ttl = 1;

#if defined(HAVE_IP_PKTINFO)
	/* Linux and Solaris IP_PKTINFO */
	if (setsockopt(fd, IPPROTO_IP, IP_PKTINFO, &one, sizeof(one)))
		zlog_warn("Could not set PKTINFO on socket fd=%d: %m", fd);
#elif defined(HAVE_IP_RECVDSTADDR)
	/* BSD IP_RECVDSTADDR */
	if (setsockopt(fd, IPPROTO_IP, IP_RECVDSTADDR, &one, sizeof(one)))
		zlog_warn("Could not set IP_RECVDSTADDR on socket fd=%d: %m",
			  fd);
#else
	flog_err(
		EC_LIB_DEVELOPMENT,
		"Missing IP_PKTINFO and IP_RECVDSTADDR: unable to get dst addr from recvmsg()");
	close(fd);
	return PIM_SOCK_ERR_DSTADDR;
#endif

	/* Set router alert (RFC 2113) for all IGMP messages (RFC
	 * 3376 4. Message Formats)*/
	if (protocol == IPPROTO_IGMP) {
		uint8_t ra[4];

		ra[0] = 148;
		ra[1] = 4;
		ra[2] = 0;
		ra[3] = 0;
		if (setsockopt(fd, IPPROTO_IP, IP_OPTIONS, ra, 4)) {
			zlog_warn(
				"Could not set Router Alert Option on socket fd=%d: %m",
				fd);
			close(fd);
			return PIM_SOCK_ERR_RA;
		}
	}

	if (setsockopt(fd, IPPROTO_IP, IP_MULTICAST_TTL, &ttl, sizeof(ttl))) {
		zlog_warn("Could not set multicast TTL=%d on socket fd=%d: %m",
			  ttl, fd);
		close(fd);
		return PIM_SOCK_ERR_TTL;
	}

	if (setsockopt_ipv4_multicast_if(fd, PIMADDR_ANY, ifp->ifindex)) {
		zlog_warn(
			"Could not set Outgoing Interface Option on socket fd=%d: %m",
			fd);
		close(fd);
		return PIM_SOCK_ERR_IFACE;
	}

	return 0;
}
#else /* PIM_IPV != 4 */
static inline int pim_setsockopt(int protocol, int fd, struct interface *ifp)
{
	int ttl = 1;
	struct ipv6_mreq mreq = {};

	setsockopt_ipv6_pktinfo(fd, 1);
	setsockopt_ipv6_multicast_hops(fd, ttl);

	mreq.ipv6mr_interface = ifp->ifindex;
	if (setsockopt(fd, IPPROTO_IPV6, IPV6_MULTICAST_IF, &mreq,
		       sizeof(mreq))) {
		zlog_warn(
			"Could not set Outgoing Interface Option on socket fd=%d: %m",
			fd);
		close(fd);
		return PIM_SOCK_ERR_IFACE;
	}

	return 0;
}
#endif

int pim_socket_mcast(int protocol, pim_addr ifaddr, struct interface *ifp,
		     uint8_t loop)
{
	int fd;
	int ret;

	fd = pim_socket_raw(protocol);
	if (fd < 0) {
		zlog_warn("Could not create multicast socket: errno=%d: %s",
			  errno, safe_strerror(errno));
		return PIM_SOCK_ERR_SOCKET;
	}

	/* XXX: if SO_BINDTODEVICE isn't available, use IP_PKTINFO / IP_RECVIF
	 * to emulate behaviour?  Or change to only use 1 socket for all
	 * interfaces? */
	ret = pim_socket_bind(fd, ifp);
	if (ret) {
		close(fd);
		zlog_warn("Could not set fd: %d for interface: %s to device",
			  fd, ifp->name);
		return PIM_SOCK_ERR_BIND;
	}

	set_nonblocking(fd);
	sockopt_reuseaddr(fd);
	setsockopt_so_recvbuf(fd, 8 * 1024 * 1024);

	ret = pim_setsockopt(protocol, fd, ifp);
	if (ret) {
		zlog_warn("pim_setsockopt failed for interface: %s to device ",
			  ifp->name);
		return ret;
	}

	/* leftover common sockopts */
	if (setsockopt_multicast_loop(fd, loop)) {
		zlog_warn(
			"Could not %s Multicast Loopback Option on socket fd=%d: %m",
			loop ? "enable" : "disable", fd);
		close(fd);
		return PIM_SOCK_ERR_LOOP;
	}

	/* Set Tx socket DSCP byte */
	if (setsockopt_iptos(fd, IPTOS_PREC_INTERNETCONTROL))
		zlog_warn("can't set sockopt IP[V6]_TOS to socket %d: %m", fd);

	return fd;
}

int pim_socket_join(int fd, pim_addr group, pim_addr ifaddr, ifindex_t ifindex,
		    struct pim_interface *pim_ifp)
{
	int ret;

#if PIM_IPV == 4
	ret = setsockopt_ipv4_multicast(fd, IP_ADD_MEMBERSHIP, ifaddr,
					group.s_addr, ifindex);
#else
	struct ipv6_mreq opt;

	memcpy(&opt.ipv6mr_multiaddr, &group, 16);
	opt.ipv6mr_interface = ifindex;
	ret = setsockopt(fd, IPPROTO_IPV6, IPV6_JOIN_GROUP, &opt, sizeof(opt));
#endif

	pim_ifp->igmp_ifstat_joins_sent++;

	if (ret) {
		flog_err(
			EC_LIB_SOCKET,
			"Failure socket joining fd=%d group %pPAs on interface address %pPAs: %m",
			fd, &group, &ifaddr);
		pim_ifp->igmp_ifstat_joins_failed++;
		return ret;
	}

	if (PIM_DEBUG_TRACE)
		zlog_debug(
			"Socket fd=%d joined group %pPAs on interface address %pPAs",
			fd, &group, &ifaddr);
	return ret;
}

#if PIM_IPV == 4
static void cmsg_getdstaddr(struct msghdr *mh, struct sockaddr_storage *dst,
			    ifindex_t *ifindex)
{
	struct cmsghdr *cmsg;
	struct sockaddr_in *dst4 = (struct sockaddr_in *)dst;

	for (cmsg = CMSG_FIRSTHDR(mh); cmsg != NULL;
	     cmsg = CMSG_NXTHDR(mh, cmsg)) {
#ifdef HAVE_IP_PKTINFO
		if ((cmsg->cmsg_level == IPPROTO_IP) &&
		    (cmsg->cmsg_type == IP_PKTINFO)) {
			struct in_pktinfo *i;

			i = (struct in_pktinfo *)CMSG_DATA(cmsg);
			if (dst4)
				dst4->sin_addr = i->ipi_addr;
			if (ifindex)
				*ifindex = i->ipi_ifindex;

			break;
		}
#endif

#ifdef HAVE_IP_RECVDSTADDR
		if ((cmsg->cmsg_level == IPPROTO_IP) &&
		    (cmsg->cmsg_type == IP_RECVDSTADDR)) {
			struct in_addr *i = (struct in_addr *)CMSG_DATA(cmsg);

			if (dst4)
				dst4->sin_addr = *i;

			break;
		}
#endif

#if defined(HAVE_IP_RECVIF) && defined(CMSG_IFINDEX)
		if (cmsg->cmsg_type == IP_RECVIF)
			if (ifindex)
				*ifindex = CMSG_IFINDEX(cmsg);
#endif
	}
}
#else  /* PIM_IPV != 4 */
static void cmsg_getdstaddr(struct msghdr *mh, struct sockaddr_storage *dst,
			    ifindex_t *ifindex)
{
	struct cmsghdr *cmsg;
	struct sockaddr_in6 *dst6 = (struct sockaddr_in6 *)dst;

	for (cmsg = CMSG_FIRSTHDR(mh); cmsg != NULL;
	     cmsg = CMSG_NXTHDR(mh, cmsg)) {
		if ((cmsg->cmsg_level == IPPROTO_IPV6) &&
		    (cmsg->cmsg_type == IPV6_PKTINFO)) {
			struct in6_pktinfo *i;

			i = (struct in6_pktinfo *)CMSG_DATA(cmsg);

			if (dst6)
				dst6->sin6_addr = i->ipi6_addr;
			if (ifindex)
				*ifindex = i->ipi6_ifindex;
			break;
		}
	}
}
#endif /* PIM_IPV != 4 */

int pim_socket_recvfromto(int fd, uint8_t *buf, size_t len,
			  struct sockaddr_storage *from, socklen_t *fromlen,
			  struct sockaddr_storage *to, socklen_t *tolen,
			  ifindex_t *ifindex)
{
	struct msghdr msgh;
	struct iovec iov;
	char cbuf[1000];
	int err;

	/*
	 * IP_PKTINFO / IP_RECVDSTADDR don't yield sin_port.
	 * Use getsockname() to get sin_port.
	 */
	if (to) {
		socklen_t to_len = sizeof(*to);

		pim_socket_getsockname(fd, (struct sockaddr *)to, &to_len);

		if (tolen)
			*tolen = sizeof(*to);
	}

	memset(&msgh, 0, sizeof(msgh));
	iov.iov_base = buf;
	iov.iov_len = len;
	msgh.msg_control = cbuf;
	msgh.msg_controllen = sizeof(cbuf);
	msgh.msg_name = from;
	msgh.msg_namelen = fromlen ? *fromlen : 0;
	msgh.msg_iov = &iov;
	msgh.msg_iovlen = 1;
	msgh.msg_flags = 0;

	err = recvmsg(fd, &msgh, 0);
	if (err < 0)
		return err;

	if (fromlen)
		*fromlen = msgh.msg_namelen;

	cmsg_getdstaddr(&msgh, to, ifindex);

	return err; /* len */
}

int pim_socket_getsockname(int fd, struct sockaddr *name, socklen_t *namelen)
{
	if (getsockname(fd, name, namelen)) {
		int e = errno;
		zlog_warn(
			"Could not get Socket Name for socket fd=%d: errno=%d: %s",
			fd, errno, safe_strerror(errno));
		errno = e;
		return PIM_SOCK_ERR_NAME;
	}

	return PIM_SOCK_ERR_NONE;
}
Commit	Line	Data
12e41d03	1	/*
896014f4 DL	2	* PIM for Quagga
	3	* Copyright (C) 2008 Everton da Silva Marques
	4	*
	5	* This program is free software; you can redistribute it and/or modify
	6	* it under the terms of the GNU General Public License as published by
	7	* the Free Software Foundation; either version 2 of the License, or
	8	* (at your option) any later version.
	9	*
	10	* This program is distributed in the hope that it will be useful, but
	11	* WITHOUT ANY WARRANTY; without even the implied warranty of
	12	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
	13	* General Public License for more details.
	14	*
	15	* You should have received a copy of the GNU General Public License along
	16	* with this program; see the file COPYING; if not, write to the Free Software
	17	* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
	18	*/
12e41d03	19
7a2fbbf0	20	#include <zebra.h>
12e41d03 DL	21
	22	#include <sys/types.h>
	23	#include <sys/socket.h>
	24	#include <netinet/in.h>
	25	#include <netinet/igmp.h>
	26	#include <arpa/inet.h>
	27	#include <unistd.h>
	28	#include <netdb.h>
	29	#include <errno.h>
	30
12e41d03 DL	31	#include "log.h"
12e41d03 DL	32	#include "privs.h"
9df99407	33	#include "if.h"
61ea3951	34	#include "vrf.h"
c5bdb09f	35	#include "sockopt.h"
3613d898	36	#include "lib_errors.h"
023d3e4a	37	#include "network.h"
12e41d03 DL	38
12e41d03 DL	39	#include "pimd.h"
993e3d8e	40	#include "pim_instance.h"
9df99407	41	#include "pim_mroute.h"
f2058cb4	42	#include "pim_iface.h"
12e41d03 DL	43	#include "pim_sock.h"
12e41d03 DL	44	#include "pim_str.h"
12e41d03	45
023d3e4a BG	46	#if PIM_IPV == 4
	47	#define setsockopt_iptos setsockopt_ipv4_tos
	48	#define setsockopt_multicast_loop setsockopt_ipv4_multicast_loop
	49	#else
	50	#define setsockopt_iptos setsockopt_ipv6_tclass
	51	#define setsockopt_multicast_loop setsockopt_ipv6_multicast_loop
	52	#endif
12e41d03	53
d62a17ae	54	int pim_socket_raw(int protocol)
12e41d03	55	{
d62a17ae	56	int fd;
12e41d03	57
0cf6db21	58	frr_with_privs(&pimd_privs) {
023d3e4a	59	fd = socket(PIM_AF, SOCK_RAW, protocol);
01b9e3fd	60	}
12e41d03	61
d62a17ae	62	if (fd < 0) {
	63	zlog_warn("Could not create raw socket: errno=%d: %s", errno,
	64	safe_strerror(errno));
	65	return PIM_SOCK_ERR_SOCKET;
	66	}
	67
	68	return fd;
12e41d03 DL	69	}
12e41d03 DL	70
e691f179	71	void pim_socket_ip_hdr(int fd)
31c680fc	72	{
0cf6db21	73	frr_with_privs(&pimd_privs) {
023d3e4a	74	#if PIM_IPV == 4
529f5225 BG	75	const int on = 1;
529f5225 BG	76
01b9e3fd	77	if (setsockopt(fd, IPPROTO_IP, IP_HDRINCL, &on, sizeof(on)))
023d3e4a BG	78	zlog_err("%s: Could not turn on IP_HDRINCL option: %m",
023d3e4a BG	79	__func__);
023d3e4a	80	#endif
01b9e3fd	81	}
31c680fc DS	82	}
31c680fc DS	83
728cd663 DS	84	/*
	85	* Given a socket and a interface,
	86	* Bind that socket to that interface
	87	*/
d62a17ae	88	int pim_socket_bind(int fd, struct interface *ifp)
728cd663	89	{
d62a17ae	90	int ret = 0;
728cd663	91
023d3e4a	92	#ifdef SO_BINDTODEVICE
0cf6db21	93	frr_with_privs(&pimd_privs) {
01b9e3fd DL	94	ret = setsockopt(fd, SOL_SOCKET, SO_BINDTODEVICE, ifp->name,
01b9e3fd DL	95	strlen(ifp->name));
01b9e3fd	96	}
f15bf553	97	#endif
d62a17ae	98	return ret;
728cd663 DS	99	}
728cd663 DS	100
023d3e4a BG	101	#if PIM_IPV == 4
023d3e4a BG	102	static inline int pim_setsockopt(int protocol, int fd, struct interface *ifp)
12e41d03	103	{
023d3e4a BG	104	int one = 1;
023d3e4a BG	105	int ttl = 1;
12e41d03	106
12e41d03	107	#if defined(HAVE_IP_PKTINFO)
023d3e4a BG	108	/* Linux and Solaris IP_PKTINFO */
	109	if (setsockopt(fd, IPPROTO_IP, IP_PKTINFO, &one, sizeof(one)))
	110	zlog_warn("Could not set PKTINFO on socket fd=%d: %m", fd);
12e41d03	111	#elif defined(HAVE_IP_RECVDSTADDR)
023d3e4a BG	112	/* BSD IP_RECVDSTADDR */
	113	if (setsockopt(fd, IPPROTO_IP, IP_RECVDSTADDR, &one, sizeof(one)))
	114	zlog_warn("Could not set IP_RECVDSTADDR on socket fd=%d: %m",
	115	fd);
12e41d03	116	#else
023d3e4a BG	117	flog_err(
	118	EC_LIB_DEVELOPMENT,
	119	"Missing IP_PKTINFO and IP_RECVDSTADDR: unable to get dst addr from recvmsg()");
	120	close(fd);
	121	return PIM_SOCK_ERR_DSTADDR;
12e41d03	122	#endif
d62a17ae	123
023d3e4a BG	124	/* Set router alert (RFC 2113) for all IGMP messages (RFC
023d3e4a BG	125	* 3376 4. Message Formats)*/
d62a17ae	126	if (protocol == IPPROTO_IGMP) {
d62a17ae	127	uint8_t ra[4];
023d3e4a	128
d62a17ae	129	ra[0] = 148;
	130	ra[1] = 4;
	131	ra[2] = 0;
	132	ra[3] = 0;
	133	if (setsockopt(fd, IPPROTO_IP, IP_OPTIONS, ra, 4)) {
	134	zlog_warn(
023d3e4a BG	135	"Could not set Router Alert Option on socket fd=%d: %m",
023d3e4a BG	136	fd);
d62a17ae	137	close(fd);
	138	return PIM_SOCK_ERR_RA;
	139	}
	140	}
	141
023d3e4a BG	142	if (setsockopt(fd, IPPROTO_IP, IP_MULTICAST_TTL, &ttl, sizeof(ttl))) {
	143	zlog_warn("Could not set multicast TTL=%d on socket fd=%d: %m",
	144	ttl, fd);
	145	close(fd);
	146	return PIM_SOCK_ERR_TTL;
d62a17ae	147	}
d62a17ae	148
023d3e4a	149	if (setsockopt_ipv4_multicast_if(fd, PIMADDR_ANY, ifp->ifindex)) {
d62a17ae	150	zlog_warn(
023d3e4a BG	151	"Could not set Outgoing Interface Option on socket fd=%d: %m",
023d3e4a BG	152	fd);
d62a17ae	153	close(fd);
023d3e4a	154	return PIM_SOCK_ERR_IFACE;
d62a17ae	155	}
d62a17ae	156
023d3e4a BG	157	return 0;
	158	}
	159	#else /* PIM_IPV != 4 */
	160	static inline int pim_setsockopt(int protocol, int fd, struct interface *ifp)
	161	{
	162	int ttl = 1;
	163	struct ipv6_mreq mreq = {};
	164
	165	setsockopt_ipv6_pktinfo(fd, 1);
	166	setsockopt_ipv6_multicast_hops(fd, ttl);
c2403b25	167
023d3e4a BG	168	mreq.ipv6mr_interface = ifp->ifindex;
023d3e4a BG	169	if (setsockopt(fd, IPPROTO_IPV6, IPV6_MULTICAST_IF, &mreq,
d62a17ae	170	sizeof(mreq))) {
d62a17ae	171	zlog_warn(
023d3e4a BG	172	"Could not set Outgoing Interface Option on socket fd=%d: %m",
023d3e4a BG	173	fd);
d62a17ae	174	close(fd);
	175	return PIM_SOCK_ERR_IFACE;
	176	}
	177
023d3e4a BG	178	return 0;
	179	}
	180	#endif
d62a17ae	181
023d3e4a BG	182	int pim_socket_mcast(int protocol, pim_addr ifaddr, struct interface *ifp,
	183	uint8_t loop)
	184	{
	185	int fd;
	186	int ret;
d62a17ae	187
023d3e4a BG	188	fd = pim_socket_raw(protocol);
	189	if (fd < 0) {
	190	zlog_warn("Could not create multicast socket: errno=%d: %s",
	191	errno, safe_strerror(errno));
	192	return PIM_SOCK_ERR_SOCKET;
	193	}
d62a17ae	194
023d3e4a BG	195	/* XXX: if SO_BINDTODEVICE isn't available, use IP_PKTINFO / IP_RECVIF
	196	* to emulate behaviour? Or change to only use 1 socket for all
	197	* interfaces? */
	198	ret = pim_socket_bind(fd, ifp);
	199	if (ret) {
	200	close(fd);
	201	zlog_warn("Could not set fd: %d for interface: %s to device",
	202	fd, ifp->name);
	203	return PIM_SOCK_ERR_BIND;
d62a17ae	204	}
d62a17ae	205
023d3e4a BG	206	set_nonblocking(fd);
	207	sockopt_reuseaddr(fd);
	208	setsockopt_so_recvbuf(fd, 8 * 1024 * 1024);
	209
	210	ret = pim_setsockopt(protocol, fd, ifp);
	211	if (ret) {
	212	zlog_warn("pim_setsockopt failed for interface: %s to device ",
	213	ifp->name);
	214	return ret;
9036d0ef SK	215	}
9036d0ef SK	216
023d3e4a BG	217	/* leftover common sockopts */
	218	if (setsockopt_multicast_loop(fd, loop)) {
	219	zlog_warn(
	220	"Could not %s Multicast Loopback Option on socket fd=%d: %m",
	221	loop ? "enable" : "disable", fd);
	222	close(fd);
	223	return PIM_SOCK_ERR_LOOP;
	224	}
	225
	226	/* Set Tx socket DSCP byte */
	227	if (setsockopt_iptos(fd, IPTOS_PREC_INTERNETCONTROL))
	228	zlog_warn("can't set sockopt IP[V6]_TOS to socket %d: %m", fd);
	229
d62a17ae	230	return fd;
12e41d03 DL	231	}
12e41d03 DL	232
f2058cb4 DA	233	int pim_socket_join(int fd, pim_addr group, pim_addr ifaddr, ifindex_t ifindex,
f2058cb4 DA	234	struct pim_interface *pim_ifp)
12e41d03	235	{
d62a17ae	236	int ret;
12e41d03	237
023d3e4a BG	238	#if PIM_IPV == 4
	239	ret = setsockopt_ipv4_multicast(fd, IP_ADD_MEMBERSHIP, ifaddr,
	240	group.s_addr, ifindex);
12e41d03	241	#else
023d3e4a	242	struct ipv6_mreq opt;
12e41d03	243
023d3e4a BG	244	memcpy(&opt.ipv6mr_multiaddr, &group, 16);
	245	opt.ipv6mr_interface = ifindex;
	246	ret = setsockopt(fd, IPPROTO_IPV6, IPV6_JOIN_GROUP, &opt, sizeof(opt));
12e41d03 DL	247	#endif
12e41d03 DL	248
f2058cb4 DA	249	pim_ifp->igmp_ifstat_joins_sent++;
f2058cb4 DA	250
d62a17ae	251	if (ret) {
af4c2728	252	flog_err(
450971aa	253	EC_LIB_SOCKET,
023d3e4a BG	254	"Failure socket joining fd=%d group %pPAs on interface address %pPAs: %m",
023d3e4a BG	255	fd, &group, &ifaddr);
f2058cb4	256	pim_ifp->igmp_ifstat_joins_failed++;
d62a17ae	257	return ret;
	258	}
	259
023d3e4a	260	if (PIM_DEBUG_TRACE)
d62a17ae	261	zlog_debug(
023d3e4a BG	262	"Socket fd=%d joined group %pPAs on interface address %pPAs",
	263	fd, &group, &ifaddr);
	264	return ret;
	265	}
	266
	267	#if PIM_IPV == 4
	268	static void cmsg_getdstaddr(struct msghdr mh, struct sockaddr_storage dst,
	269	ifindex_t *ifindex)
	270	{
	271	struct cmsghdr *cmsg;
	272	struct sockaddr_in dst4 = (struct sockaddr_in )dst;
	273
	274	for (cmsg = CMSG_FIRSTHDR(mh); cmsg != NULL;
	275	cmsg = CMSG_NXTHDR(mh, cmsg)) {
	276	#ifdef HAVE_IP_PKTINFO
	277	if ((cmsg->cmsg_level == IPPROTO_IP) &&
	278	(cmsg->cmsg_type == IP_PKTINFO)) {
	279	struct in_pktinfo *i;
	280
	281	i = (struct in_pktinfo *)CMSG_DATA(cmsg);
	282	if (dst4)
	283	dst4->sin_addr = i->ipi_addr;
	284	if (ifindex)
	285	*ifindex = i->ipi_ifindex;
	286
	287	break;
	288	}
	289	#endif
	290
	291	#ifdef HAVE_IP_RECVDSTADDR
	292	if ((cmsg->cmsg_level == IPPROTO_IP) &&
	293	(cmsg->cmsg_type == IP_RECVDSTADDR)) {
	294	struct in_addr i = (struct in_addr )CMSG_DATA(cmsg);
	295
	296	if (dst4)
	297	dst4->sin_addr = *i;
	298
	299	break;
	300	}
	301	#endif
	302
	303	#if defined(HAVE_IP_RECVIF) && defined(CMSG_IFINDEX)
	304	if (cmsg->cmsg_type == IP_RECVIF)
	305	if (ifindex)
	306	*ifindex = CMSG_IFINDEX(cmsg);
	307	#endif
d62a17ae	308	}
023d3e4a BG	309	}
	310	#else /* PIM_IPV != 4 */
	311	static void cmsg_getdstaddr(struct msghdr mh, struct sockaddr_storage dst,
	312	ifindex_t *ifindex)
	313	{
	314	struct cmsghdr *cmsg;
	315	struct sockaddr_in6 dst6 = (struct sockaddr_in6 )dst;
d62a17ae	316
023d3e4a BG	317	for (cmsg = CMSG_FIRSTHDR(mh); cmsg != NULL;
	318	cmsg = CMSG_NXTHDR(mh, cmsg)) {
	319	if ((cmsg->cmsg_level == IPPROTO_IPV6) &&
	320	(cmsg->cmsg_type == IPV6_PKTINFO)) {
	321	struct in6_pktinfo *i;
	322
	323	i = (struct in6_pktinfo *)CMSG_DATA(cmsg);
	324
	325	if (dst6)
	326	dst6->sin6_addr = i->ipi6_addr;
	327	if (ifindex)
	328	*ifindex = i->ipi6_ifindex;
	329	break;
	330	}
	331	}
12e41d03	332	}
023d3e4a	333	#endif /* PIM_IPV != 4 */
12e41d03	334
12e41d03	335	int pim_socket_recvfromto(int fd, uint8_t *buf, size_t len,
023d3e4a BG	336	struct sockaddr_storage from, socklen_t fromlen,
023d3e4a BG	337	struct sockaddr_storage to, socklen_t tolen,
b892f1dd	338	ifindex_t *ifindex)
12e41d03	339	{
d62a17ae	340	struct msghdr msgh;
d62a17ae	341	struct iovec iov;
	342	char cbuf[1000];
	343	int err;
	344
	345	/*
	346	* IP_PKTINFO / IP_RECVDSTADDR don't yield sin_port.
	347	* Use getsockname() to get sin_port.
	348	*/
	349	if (to) {
023d3e4a	350	socklen_t to_len = sizeof(*to);
d62a17ae	351
023d3e4a	352	pim_socket_getsockname(fd, (struct sockaddr *)to, &to_len);
d62a17ae	353
d62a17ae	354	if (tolen)
023d3e4a	355	tolen = sizeof(to);
d62a17ae	356	}
d62a17ae	357
6006b807	358	memset(&msgh, 0, sizeof(msgh));
d62a17ae	359	iov.iov_base = buf;
	360	iov.iov_len = len;
	361	msgh.msg_control = cbuf;
	362	msgh.msg_controllen = sizeof(cbuf);
	363	msgh.msg_name = from;
	364	msgh.msg_namelen = fromlen ? *fromlen : 0;
	365	msgh.msg_iov = &iov;
	366	msgh.msg_iovlen = 1;
	367	msgh.msg_flags = 0;
	368
	369	err = recvmsg(fd, &msgh, 0);
	370	if (err < 0)
	371	return err;
	372
	373	if (fromlen)
	374	*fromlen = msgh.msg_namelen;
	375
023d3e4a	376	cmsg_getdstaddr(&msgh, to, ifindex);
12e41d03	377
d62a17ae	378	return err; /* len */
12e41d03 DL	379	}
12e41d03 DL	380
12e41d03 DL	381	int pim_socket_getsockname(int fd, struct sockaddr name, socklen_t namelen)
12e41d03 DL	382	{
d62a17ae	383	if (getsockname(fd, name, namelen)) {
	384	int e = errno;
	385	zlog_warn(
	386	"Could not get Socket Name for socket fd=%d: errno=%d: %s",
	387	fd, errno, safe_strerror(errno));
	388	errno = e;
	389	return PIM_SOCK_ERR_NAME;
	390	}
	391
	392	return PIM_SOCK_ERR_NONE;
12e41d03	393	}