[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)
{
	const int on = 1;

	frr_with_privs(&pimd_privs) {
#if PIM_IPV == 4
		if (setsockopt(fd, IPPROTO_IP, IP_HDRINCL, &on, sizeof(on)))
			zlog_err("%s: Could not turn on IP_HDRINCL option: %m",
				 __func__);
#else
		if (setsockopt(fd, IPPROTO_IPV6, IPV6_HDRINCL, &on, sizeof(on)))
			zlog_err(
				"%s: Could not turn on IPV6_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	{
d62a17ae	73	const int on = 1;
31c680fc	74
0cf6db21	75	frr_with_privs(&pimd_privs) {
023d3e4a	76	#if PIM_IPV == 4
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",
	79	__func__);
	80	#else
	81	if (setsockopt(fd, IPPROTO_IPV6, IPV6_HDRINCL, &on, sizeof(on)))
	82	zlog_err(
	83	"%s: Could not turn on IPV6_HDRINCL option: %m",
	84	__func__);
	85	#endif
01b9e3fd	86	}
31c680fc DS	87	}
31c680fc DS	88
728cd663 DS	89	/*
	90	* Given a socket and a interface,
	91	* Bind that socket to that interface
	92	*/
d62a17ae	93	int pim_socket_bind(int fd, struct interface *ifp)
728cd663	94	{
d62a17ae	95	int ret = 0;
728cd663	96
023d3e4a	97	#ifdef SO_BINDTODEVICE
0cf6db21	98	frr_with_privs(&pimd_privs) {
01b9e3fd DL	99	ret = setsockopt(fd, SOL_SOCKET, SO_BINDTODEVICE, ifp->name,
01b9e3fd DL	100	strlen(ifp->name));
01b9e3fd	101	}
f15bf553	102	#endif
d62a17ae	103	return ret;
728cd663 DS	104	}
728cd663 DS	105
023d3e4a BG	106	#if PIM_IPV == 4
023d3e4a BG	107	static inline int pim_setsockopt(int protocol, int fd, struct interface *ifp)
12e41d03	108	{
023d3e4a BG	109	int one = 1;
023d3e4a BG	110	int ttl = 1;
12e41d03	111
12e41d03	112	#if defined(HAVE_IP_PKTINFO)
023d3e4a BG	113	/* Linux and Solaris IP_PKTINFO */
	114	if (setsockopt(fd, IPPROTO_IP, IP_PKTINFO, &one, sizeof(one)))
	115	zlog_warn("Could not set PKTINFO on socket fd=%d: %m", fd);
12e41d03	116	#elif defined(HAVE_IP_RECVDSTADDR)
023d3e4a BG	117	/* BSD IP_RECVDSTADDR */
	118	if (setsockopt(fd, IPPROTO_IP, IP_RECVDSTADDR, &one, sizeof(one)))
	119	zlog_warn("Could not set IP_RECVDSTADDR on socket fd=%d: %m",
	120	fd);
12e41d03	121	#else
023d3e4a BG	122	flog_err(
	123	EC_LIB_DEVELOPMENT,
	124	"Missing IP_PKTINFO and IP_RECVDSTADDR: unable to get dst addr from recvmsg()");
	125	close(fd);
	126	return PIM_SOCK_ERR_DSTADDR;
12e41d03	127	#endif
d62a17ae	128
023d3e4a BG	129	/* Set router alert (RFC 2113) for all IGMP messages (RFC
023d3e4a BG	130	* 3376 4. Message Formats)*/
d62a17ae	131	if (protocol == IPPROTO_IGMP) {
d62a17ae	132	uint8_t ra[4];
023d3e4a	133
d62a17ae	134	ra[0] = 148;
	135	ra[1] = 4;
	136	ra[2] = 0;
	137	ra[3] = 0;
	138	if (setsockopt(fd, IPPROTO_IP, IP_OPTIONS, ra, 4)) {
	139	zlog_warn(
023d3e4a BG	140	"Could not set Router Alert Option on socket fd=%d: %m",
023d3e4a BG	141	fd);
d62a17ae	142	close(fd);
	143	return PIM_SOCK_ERR_RA;
	144	}
	145	}
	146
023d3e4a BG	147	if (setsockopt(fd, IPPROTO_IP, IP_MULTICAST_TTL, &ttl, sizeof(ttl))) {
	148	zlog_warn("Could not set multicast TTL=%d on socket fd=%d: %m",
	149	ttl, fd);
	150	close(fd);
	151	return PIM_SOCK_ERR_TTL;
d62a17ae	152	}
d62a17ae	153
023d3e4a	154	if (setsockopt_ipv4_multicast_if(fd, PIMADDR_ANY, ifp->ifindex)) {
d62a17ae	155	zlog_warn(
023d3e4a BG	156	"Could not set Outgoing Interface Option on socket fd=%d: %m",
023d3e4a BG	157	fd);
d62a17ae	158	close(fd);
023d3e4a	159	return PIM_SOCK_ERR_IFACE;
d62a17ae	160	}
d62a17ae	161
023d3e4a BG	162	return 0;
	163	}
	164	#else /* PIM_IPV != 4 */
	165	static inline int pim_setsockopt(int protocol, int fd, struct interface *ifp)
	166	{
	167	int ttl = 1;
	168	struct ipv6_mreq mreq = {};
	169
	170	setsockopt_ipv6_pktinfo(fd, 1);
	171	setsockopt_ipv6_multicast_hops(fd, ttl);
c2403b25	172
023d3e4a BG	173	mreq.ipv6mr_interface = ifp->ifindex;
023d3e4a BG	174	if (setsockopt(fd, IPPROTO_IPV6, IPV6_MULTICAST_IF, &mreq,
d62a17ae	175	sizeof(mreq))) {
d62a17ae	176	zlog_warn(
023d3e4a BG	177	"Could not set Outgoing Interface Option on socket fd=%d: %m",
023d3e4a BG	178	fd);
d62a17ae	179	close(fd);
	180	return PIM_SOCK_ERR_IFACE;
	181	}
	182
023d3e4a BG	183	return 0;
	184	}
	185	#endif
d62a17ae	186
023d3e4a BG	187	int pim_socket_mcast(int protocol, pim_addr ifaddr, struct interface *ifp,
	188	uint8_t loop)
	189	{
	190	int fd;
	191	int ret;
d62a17ae	192
023d3e4a BG	193	fd = pim_socket_raw(protocol);
	194	if (fd < 0) {
	195	zlog_warn("Could not create multicast socket: errno=%d: %s",
	196	errno, safe_strerror(errno));
	197	return PIM_SOCK_ERR_SOCKET;
	198	}
d62a17ae	199
023d3e4a BG	200	/* XXX: if SO_BINDTODEVICE isn't available, use IP_PKTINFO / IP_RECVIF
	201	* to emulate behaviour? Or change to only use 1 socket for all
	202	* interfaces? */
	203	ret = pim_socket_bind(fd, ifp);
	204	if (ret) {
	205	close(fd);
	206	zlog_warn("Could not set fd: %d for interface: %s to device",
	207	fd, ifp->name);
	208	return PIM_SOCK_ERR_BIND;
d62a17ae	209	}
d62a17ae	210
023d3e4a BG	211	set_nonblocking(fd);
	212	sockopt_reuseaddr(fd);
	213	setsockopt_so_recvbuf(fd, 8 * 1024 * 1024);
	214
	215	ret = pim_setsockopt(protocol, fd, ifp);
	216	if (ret) {
	217	zlog_warn("pim_setsockopt failed for interface: %s to device ",
	218	ifp->name);
	219	return ret;
9036d0ef SK	220	}
9036d0ef SK	221
023d3e4a BG	222	/* leftover common sockopts */
	223	if (setsockopt_multicast_loop(fd, loop)) {
	224	zlog_warn(
	225	"Could not %s Multicast Loopback Option on socket fd=%d: %m",
	226	loop ? "enable" : "disable", fd);
	227	close(fd);
	228	return PIM_SOCK_ERR_LOOP;
	229	}
	230
	231	/* Set Tx socket DSCP byte */
	232	if (setsockopt_iptos(fd, IPTOS_PREC_INTERNETCONTROL))
	233	zlog_warn("can't set sockopt IP[V6]_TOS to socket %d: %m", fd);
	234
d62a17ae	235	return fd;
12e41d03 DL	236	}
12e41d03 DL	237
f2058cb4 DA	238	int pim_socket_join(int fd, pim_addr group, pim_addr ifaddr, ifindex_t ifindex,
f2058cb4 DA	239	struct pim_interface *pim_ifp)
12e41d03	240	{
d62a17ae	241	int ret;
12e41d03	242
023d3e4a BG	243	#if PIM_IPV == 4
	244	ret = setsockopt_ipv4_multicast(fd, IP_ADD_MEMBERSHIP, ifaddr,
	245	group.s_addr, ifindex);
12e41d03	246	#else
023d3e4a	247	struct ipv6_mreq opt;
12e41d03	248
023d3e4a BG	249	memcpy(&opt.ipv6mr_multiaddr, &group, 16);
	250	opt.ipv6mr_interface = ifindex;
	251	ret = setsockopt(fd, IPPROTO_IPV6, IPV6_JOIN_GROUP, &opt, sizeof(opt));
12e41d03 DL	252	#endif
12e41d03 DL	253
f2058cb4 DA	254	pim_ifp->igmp_ifstat_joins_sent++;
f2058cb4 DA	255
d62a17ae	256	if (ret) {
af4c2728	257	flog_err(
450971aa	258	EC_LIB_SOCKET,
023d3e4a BG	259	"Failure socket joining fd=%d group %pPAs on interface address %pPAs: %m",
023d3e4a BG	260	fd, &group, &ifaddr);
f2058cb4	261	pim_ifp->igmp_ifstat_joins_failed++;
d62a17ae	262	return ret;
	263	}
	264
023d3e4a	265	if (PIM_DEBUG_TRACE)
d62a17ae	266	zlog_debug(
023d3e4a BG	267	"Socket fd=%d joined group %pPAs on interface address %pPAs",
	268	fd, &group, &ifaddr);
	269	return ret;
	270	}
	271
	272	#if PIM_IPV == 4
	273	static void cmsg_getdstaddr(struct msghdr mh, struct sockaddr_storage dst,
	274	ifindex_t *ifindex)
	275	{
	276	struct cmsghdr *cmsg;
	277	struct sockaddr_in dst4 = (struct sockaddr_in )dst;
	278
	279	for (cmsg = CMSG_FIRSTHDR(mh); cmsg != NULL;
	280	cmsg = CMSG_NXTHDR(mh, cmsg)) {
	281	#ifdef HAVE_IP_PKTINFO
	282	if ((cmsg->cmsg_level == IPPROTO_IP) &&
	283	(cmsg->cmsg_type == IP_PKTINFO)) {
	284	struct in_pktinfo *i;
	285
	286	i = (struct in_pktinfo *)CMSG_DATA(cmsg);
	287	if (dst4)
	288	dst4->sin_addr = i->ipi_addr;
	289	if (ifindex)
	290	*ifindex = i->ipi_ifindex;
	291
	292	break;
	293	}
	294	#endif
	295
	296	#ifdef HAVE_IP_RECVDSTADDR
	297	if ((cmsg->cmsg_level == IPPROTO_IP) &&
	298	(cmsg->cmsg_type == IP_RECVDSTADDR)) {
	299	struct in_addr i = (struct in_addr )CMSG_DATA(cmsg);
	300
	301	if (dst4)
	302	dst4->sin_addr = *i;
	303
	304	break;
	305	}
	306	#endif
	307
	308	#if defined(HAVE_IP_RECVIF) && defined(CMSG_IFINDEX)
	309	if (cmsg->cmsg_type == IP_RECVIF)
	310	if (ifindex)
	311	*ifindex = CMSG_IFINDEX(cmsg);
	312	#endif
d62a17ae	313	}
023d3e4a BG	314	}
	315	#else /* PIM_IPV != 4 */
	316	static void cmsg_getdstaddr(struct msghdr mh, struct sockaddr_storage dst,
	317	ifindex_t *ifindex)
	318	{
	319	struct cmsghdr *cmsg;
	320	struct sockaddr_in6 dst6 = (struct sockaddr_in6 )dst;
d62a17ae	321
023d3e4a BG	322	for (cmsg = CMSG_FIRSTHDR(mh); cmsg != NULL;
	323	cmsg = CMSG_NXTHDR(mh, cmsg)) {
	324	if ((cmsg->cmsg_level == IPPROTO_IPV6) &&
	325	(cmsg->cmsg_type == IPV6_PKTINFO)) {
	326	struct in6_pktinfo *i;
	327
	328	i = (struct in6_pktinfo *)CMSG_DATA(cmsg);
	329
	330	if (dst6)
	331	dst6->sin6_addr = i->ipi6_addr;
	332	if (ifindex)
	333	*ifindex = i->ipi6_ifindex;
	334	break;
	335	}
	336	}
12e41d03	337	}
023d3e4a	338	#endif /* PIM_IPV != 4 */
12e41d03	339
12e41d03	340	int pim_socket_recvfromto(int fd, uint8_t *buf, size_t len,
023d3e4a BG	341	struct sockaddr_storage from, socklen_t fromlen,
023d3e4a BG	342	struct sockaddr_storage to, socklen_t tolen,
b892f1dd	343	ifindex_t *ifindex)
12e41d03	344	{
d62a17ae	345	struct msghdr msgh;
d62a17ae	346	struct iovec iov;
	347	char cbuf[1000];
	348	int err;
	349
	350	/*
	351	* IP_PKTINFO / IP_RECVDSTADDR don't yield sin_port.
	352	* Use getsockname() to get sin_port.
	353	*/
	354	if (to) {
023d3e4a	355	socklen_t to_len = sizeof(*to);
d62a17ae	356
023d3e4a	357	pim_socket_getsockname(fd, (struct sockaddr *)to, &to_len);
d62a17ae	358
d62a17ae	359	if (tolen)
023d3e4a	360	tolen = sizeof(to);
d62a17ae	361	}
d62a17ae	362
6006b807	363	memset(&msgh, 0, sizeof(msgh));
d62a17ae	364	iov.iov_base = buf;
	365	iov.iov_len = len;
	366	msgh.msg_control = cbuf;
	367	msgh.msg_controllen = sizeof(cbuf);
	368	msgh.msg_name = from;
	369	msgh.msg_namelen = fromlen ? *fromlen : 0;
	370	msgh.msg_iov = &iov;
	371	msgh.msg_iovlen = 1;
	372	msgh.msg_flags = 0;
	373
	374	err = recvmsg(fd, &msgh, 0);
	375	if (err < 0)
	376	return err;
	377
	378	if (fromlen)
	379	*fromlen = msgh.msg_namelen;
	380
023d3e4a	381	cmsg_getdstaddr(&msgh, to, ifindex);
12e41d03	382
d62a17ae	383	return err; /* len */
12e41d03 DL	384	}
12e41d03 DL	385
12e41d03 DL	386	int pim_socket_getsockname(int fd, struct sockaddr name, socklen_t namelen)
12e41d03 DL	387	{
d62a17ae	388	if (getsockname(fd, name, namelen)) {
	389	int e = errno;
	390	zlog_warn(
	391	"Could not get Socket Name for socket fd=%d: errno=%d: %s",
	392	fd, errno, safe_strerror(errno));
	393	errno = e;
	394	return PIM_SOCK_ERR_NAME;
	395	}
	396
	397	return PIM_SOCK_ERR_NONE;
12e41d03	398	}