[mirror_frr.git] / pimd / pim_msdp_socket.c

/*
 * IP MSDP socket management
 * Copyright (C) 2016 Cumulus Networks, Inc.
 *
 * 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 <lib/log.h>
#include <lib/network.h>
#include <lib/sockunion.h>
#include <lib/thread.h>
#include <lib/vty.h>
#include <lib/if.h>
#include <lib/vrf.h>
#include <lib/lib_errors.h>

#include "pimd.h"
#include "pim_sock.h"

#include "pim_msdp.h"
#include "pim_msdp_socket.h"

/* increase socket send buffer size */
static void pim_msdp_update_sock_send_buffer_size(int fd)
{
	int size = PIM_MSDP_SOCKET_SNDBUF_SIZE;
	int optval;
	socklen_t optlen = sizeof(optval);

	if (getsockopt(fd, SOL_SOCKET, SO_SNDBUF, &optval, &optlen) < 0) {
		zlog_ferr(LIB_ERR_SOCKET, "getsockopt of SO_SNDBUF failed %s\n",
			  safe_strerror(errno));
		return;
	}

	if (optval < size) {
		if (setsockopt(fd, SOL_SOCKET, SO_SNDBUF, &size, sizeof(size))
		    < 0) {
			zlog_ferr(LIB_ERR_SOCKET,
				  "Couldn't increase send buffer: %s\n",
				  safe_strerror(errno));
		}
	}
}

/* passive peer socket accept */
static int pim_msdp_sock_accept(struct thread *thread)
{
	union sockunion su;
	struct pim_instance *pim = THREAD_ARG(thread);
	int accept_sock;
	int msdp_sock;
	struct pim_msdp_peer *mp;
	char buf[SU_ADDRSTRLEN];

	sockunion_init(&su);

	/* re-register accept thread */
	accept_sock = THREAD_FD(thread);
	if (accept_sock < 0) {
		zlog_ferr(LIB_ERR_DEVELOPMENT,
			  "accept_sock is negative value %d", accept_sock);
		return -1;
	}
	pim->msdp.listener.thread = NULL;
	thread_add_read(master, pim_msdp_sock_accept, pim, accept_sock,
			&pim->msdp.listener.thread);

	/* accept client connection. */
	msdp_sock = sockunion_accept(accept_sock, &su);
	if (msdp_sock < 0) {
		zlog_ferr(LIB_ERR_SOCKET, "pim_msdp_sock_accept failed (%s)",
			  safe_strerror(errno));
		return -1;
	}

	/* see if have peer config for this */
	mp = pim_msdp_peer_find(pim, su.sin.sin_addr);
	if (!mp || !PIM_MSDP_PEER_IS_LISTENER(mp)) {
		++pim->msdp.rejected_accepts;
		if (PIM_DEBUG_MSDP_EVENTS) {
			zlog_err("msdp peer connection refused from %s",
				 sockunion2str(&su, buf, SU_ADDRSTRLEN));
		}
		close(msdp_sock);
		return -1;
	}

	if (PIM_DEBUG_MSDP_INTERNAL) {
		zlog_debug("MSDP peer %s accept success%s", mp->key_str,
			   mp->fd >= 0 ? "(dup)" : "");
	}

	/* if we have an existing connection we need to kill that one
	 * with this one */
	if (mp->fd >= 0) {
		if (PIM_DEBUG_MSDP_EVENTS) {
			zlog_notice(
				"msdp peer new connection from %s stop old connection",
				sockunion2str(&su, buf, SU_ADDRSTRLEN));
		}
		pim_msdp_peer_stop_tcp_conn(mp, true /* chg_state */);
	}
	mp->fd = msdp_sock;
	set_nonblocking(mp->fd);
	pim_msdp_update_sock_send_buffer_size(mp->fd);
	pim_msdp_peer_established(mp);
	return 0;
}

/* global listener for the MSDP well know TCP port */
int pim_msdp_sock_listen(struct pim_instance *pim)
{
	int sock;
	int socklen;
	struct sockaddr_in sin;
	int rc;
	struct pim_msdp_listener *listener = &pim->msdp.listener;

	if (pim->msdp.flags & PIM_MSDPF_LISTENER) {
		/* listener already setup */
		return 0;
	}

	sock = socket(AF_INET, SOCK_STREAM, 0);
	if (sock < 0) {
		zlog_ferr(LIB_ERR_SOCKET, "socket: %s", safe_strerror(errno));
		return sock;
	}

	memset(&sin, 0, sizeof(struct sockaddr_in));
	sin.sin_family = AF_INET;
	sin.sin_port = htons(PIM_MSDP_TCP_PORT);
	socklen = sizeof(struct sockaddr_in);
#ifdef HAVE_STRUCT_SOCKADDR_IN_SIN_LEN
	sin.sin_len = socklen;
#endif /* HAVE_STRUCT_SOCKADDR_IN_SIN_LEN */

	sockopt_reuseaddr(sock);
	sockopt_reuseport(sock);

	if (pim->vrf_id != VRF_DEFAULT) {
		struct interface *ifp =
			if_lookup_by_name(pim->vrf->name, pim->vrf_id);
		if (!ifp) {
			zlog_ferr(LIB_ERR_INTERFACE,
				  "%s: Unable to lookup vrf interface: %s",
				  __PRETTY_FUNCTION__, pim->vrf->name);
			close(sock);
			return -1;
		}
		if (pim_socket_bind(sock, ifp)) {
			zlog_ferr(LIB_ERR_SOCKET,
				  "%s: Unable to bind to socket: %s",
				  __PRETTY_FUNCTION__, safe_strerror(errno));
			close(sock);
			return -1;
		}
	}

	if (pimd_privs.change(ZPRIVS_RAISE)) {
		zlog_ferr(LIB_ERR_PRIVILEGES,
			  "pim_msdp_socket: could not raise privs, %s",
			  safe_strerror(errno));
	}

	/* bind to well known TCP port */
	rc = bind(sock, (struct sockaddr *)&sin, socklen);

	if (pimd_privs.change(ZPRIVS_LOWER)) {
		zlog_ferr(LIB_ERR_PRIVILEGES,
			  "pim_msdp_socket: could not lower privs, %s",
			  safe_strerror(errno));
	}

	if (rc < 0) {
		zlog_ferr(LIB_ERR_SOCKET, "pim_msdp_socket bind to port %d: %s",
			  ntohs(sin.sin_port), safe_strerror(errno));
		close(sock);
		return rc;
	}

	rc = listen(sock, 3 /* backlog */);
	if (rc < 0) {
		zlog_ferr(LIB_ERR_SOCKET, "pim_msdp_socket listen: %s",
			  safe_strerror(errno));
		close(sock);
		return rc;
	}

	/* add accept thread */
	listener->fd = sock;
	memcpy(&listener->su, &sin, socklen);
	listener->thread = NULL;
	thread_add_read(pim->msdp.master, pim_msdp_sock_accept, pim, sock,
			&listener->thread);

	pim->msdp.flags |= PIM_MSDPF_LISTENER;
	return 0;
}

/* active peer socket setup */
int pim_msdp_sock_connect(struct pim_msdp_peer *mp)
{
	int rc;

	if (PIM_DEBUG_MSDP_INTERNAL) {
		zlog_debug("MSDP peer %s attempt connect%s", mp->key_str,
			   mp->fd < 0 ? "" : "(dup)");
	}

	/* if we have an existing connection we need to kill that one
	 * with this one */
	if (mp->fd >= 0) {
		if (PIM_DEBUG_MSDP_EVENTS) {
			zlog_notice(
				"msdp duplicate connect to %s nuke old connection",
				mp->key_str);
		}
		pim_msdp_peer_stop_tcp_conn(mp, false /* chg_state */);
	}

	/* Make socket for the peer. */
	mp->fd = sockunion_socket(&mp->su_peer);
	if (mp->fd < 0) {
		zlog_ferr(LIB_ERR_SOCKET, "pim_msdp_socket socket failure: %s",
			  safe_strerror(errno));
		return -1;
	}

	if (mp->pim->vrf_id != VRF_DEFAULT) {
		struct interface *ifp =
			if_lookup_by_name(mp->pim->vrf->name, mp->pim->vrf_id);
		if (!ifp) {
			zlog_ferr(LIB_ERR_INTERFACE,
				  "%s: Unable to lookup vrf interface: %s",
				  __PRETTY_FUNCTION__, mp->pim->vrf->name);
			return -1;
		}
		if (pim_socket_bind(mp->fd, ifp)) {
			zlog_ferr(LIB_ERR_SOCKET,
				  "%s: Unable to bind to socket: %s",
				  __PRETTY_FUNCTION__, safe_strerror(errno));
			close(mp->fd);
			mp->fd = -1;
			return -1;
		}
	}

	set_nonblocking(mp->fd);

	/* Set socket send buffer size */
	pim_msdp_update_sock_send_buffer_size(mp->fd);
	sockopt_reuseaddr(mp->fd);
	sockopt_reuseport(mp->fd);

	/* source bind */
	rc = sockunion_bind(mp->fd, &mp->su_local, 0, &mp->su_local);
	if (rc < 0) {
		zlog_ferr(LIB_ERR_SOCKET,
			  "pim_msdp_socket connect bind failure: %s",
			  safe_strerror(errno));
		close(mp->fd);
		mp->fd = -1;
		return rc;
	}

	/* Connect to the remote mp. */
	return (sockunion_connect(mp->fd, &mp->su_peer,
				  htons(PIM_MSDP_TCP_PORT), 0));
}
Commit	Line	Data
2a333e0f	1	/*
	2	* IP MSDP socket management
	3	* Copyright (C) 2016 Cumulus Networks, Inc.
	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	*
896014f4 DL	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
2a333e0f	18	*/
	19
	20	#include <zebra.h>
	21
	22	#include <lib/log.h>
	23	#include <lib/network.h>
2a333e0f	24	#include <lib/sockunion.h>
3c72d654	25	#include <lib/thread.h>
3c72d654	26	#include <lib/vty.h>
62fde409 DS	27	#include <lib/if.h>
62fde409 DS	28	#include <lib/vrf.h>
3613d898	29	#include <lib/lib_errors.h>
2a333e0f	30
2a333e0f	31	#include "pimd.h"
62fde409	32	#include "pim_sock.h"
2a333e0f	33
	34	#include "pim_msdp.h"
	35	#include "pim_msdp_socket.h"
	36
2a333e0f	37	/* increase socket send buffer size */
d62a17ae	38	static void pim_msdp_update_sock_send_buffer_size(int fd)
2a333e0f	39	{
d62a17ae	40	int size = PIM_MSDP_SOCKET_SNDBUF_SIZE;
	41	int optval;
	42	socklen_t optlen = sizeof(optval);
	43
	44	if (getsockopt(fd, SOL_SOCKET, SO_SNDBUF, &optval, &optlen) < 0) {
3613d898 DS	45	zlog_ferr(LIB_ERR_SOCKET, "getsockopt of SO_SNDBUF failed %s\n",
3613d898 DS	46	safe_strerror(errno));
d62a17ae	47	return;
	48	}
	49
	50	if (optval < size) {
	51	if (setsockopt(fd, SOL_SOCKET, SO_SNDBUF, &size, sizeof(size))
	52	< 0) {
3613d898 DS	53	zlog_ferr(LIB_ERR_SOCKET,
	54	"Couldn't increase send buffer: %s\n",
	55	safe_strerror(errno));
d62a17ae	56	}
d62a17ae	57	}
2a333e0f	58	}
	59
	60	/* passive peer socket accept */
d62a17ae	61	static int pim_msdp_sock_accept(struct thread *thread)
2a333e0f	62	{
d62a17ae	63	union sockunion su;
472ad383	64	struct pim_instance *pim = THREAD_ARG(thread);
d62a17ae	65	int accept_sock;
	66	int msdp_sock;
	67	struct pim_msdp_peer *mp;
	68	char buf[SU_ADDRSTRLEN];
	69
	70	sockunion_init(&su);
	71
	72	/* re-register accept thread */
	73	accept_sock = THREAD_FD(thread);
	74	if (accept_sock < 0) {
3613d898 DS	75	zlog_ferr(LIB_ERR_DEVELOPMENT,
3613d898 DS	76	"accept_sock is negative value %d", accept_sock);
d62a17ae	77	return -1;
d62a17ae	78	}
472ad383 DS	79	pim->msdp.listener.thread = NULL;
	80	thread_add_read(master, pim_msdp_sock_accept, pim, accept_sock,
	81	&pim->msdp.listener.thread);
d62a17ae	82
	83	/* accept client connection. */
	84	msdp_sock = sockunion_accept(accept_sock, &su);
	85	if (msdp_sock < 0) {
3613d898 DS	86	zlog_ferr(LIB_ERR_SOCKET, "pim_msdp_sock_accept failed (%s)",
3613d898 DS	87	safe_strerror(errno));
d62a17ae	88	return -1;
	89	}
	90
	91	/* see if have peer config for this */
472ad383	92	mp = pim_msdp_peer_find(pim, su.sin.sin_addr);
d62a17ae	93	if (!mp \|\| !PIM_MSDP_PEER_IS_LISTENER(mp)) {
472ad383	94	++pim->msdp.rejected_accepts;
d62a17ae	95	if (PIM_DEBUG_MSDP_EVENTS) {
	96	zlog_err("msdp peer connection refused from %s",
	97	sockunion2str(&su, buf, SU_ADDRSTRLEN));
	98	}
	99	close(msdp_sock);
	100	return -1;
	101	}
	102
	103	if (PIM_DEBUG_MSDP_INTERNAL) {
	104	zlog_debug("MSDP peer %s accept success%s", mp->key_str,
	105	mp->fd >= 0 ? "(dup)" : "");
	106	}
	107
	108	/* if we have an existing connection we need to kill that one
	109	* with this one */
	110	if (mp->fd >= 0) {
	111	if (PIM_DEBUG_MSDP_EVENTS) {
3613d898	112	zlog_notice(
d62a17ae	113	"msdp peer new connection from %s stop old connection",
	114	sockunion2str(&su, buf, SU_ADDRSTRLEN));
	115	}
	116	pim_msdp_peer_stop_tcp_conn(mp, true /* chg_state */);
	117	}
	118	mp->fd = msdp_sock;
	119	set_nonblocking(mp->fd);
	120	pim_msdp_update_sock_send_buffer_size(mp->fd);
	121	pim_msdp_peer_established(mp);
	122	return 0;
2a333e0f	123	}
	124
	125	/* global listener for the MSDP well know TCP port */
472ad383	126	int pim_msdp_sock_listen(struct pim_instance *pim)
2a333e0f	127	{
d62a17ae	128	int sock;
	129	int socklen;
	130	struct sockaddr_in sin;
	131	int rc;
472ad383	132	struct pim_msdp_listener *listener = &pim->msdp.listener;
d62a17ae	133
472ad383	134	if (pim->msdp.flags & PIM_MSDPF_LISTENER) {
d62a17ae	135	/* listener already setup */
	136	return 0;
	137	}
	138
	139	sock = socket(AF_INET, SOCK_STREAM, 0);
	140	if (sock < 0) {
3613d898	141	zlog_ferr(LIB_ERR_SOCKET, "socket: %s", safe_strerror(errno));
d62a17ae	142	return sock;
	143	}
	144
	145	memset(&sin, 0, sizeof(struct sockaddr_in));
	146	sin.sin_family = AF_INET;
	147	sin.sin_port = htons(PIM_MSDP_TCP_PORT);
	148	socklen = sizeof(struct sockaddr_in);
2a333e0f	149	#ifdef HAVE_STRUCT_SOCKADDR_IN_SIN_LEN
d62a17ae	150	sin.sin_len = socklen;
2a333e0f	151	#endif /* HAVE_STRUCT_SOCKADDR_IN_SIN_LEN */
2a333e0f	152
d62a17ae	153	sockopt_reuseaddr(sock);
	154	sockopt_reuseport(sock);
	155
2267994c DS	156	if (pim->vrf_id != VRF_DEFAULT) {
	157	struct interface *ifp =
	158	if_lookup_by_name(pim->vrf->name, pim->vrf_id);
449a3f5b	159	if (!ifp) {
3613d898 DS	160	zlog_ferr(LIB_ERR_INTERFACE,
	161	"%s: Unable to lookup vrf interface: %s",
	162	__PRETTY_FUNCTION__, pim->vrf->name);
e691f179 DS	163	close(sock);
	164	return -1;
	165	}
	166	if (pim_socket_bind(sock, ifp)) {
3613d898 DS	167	zlog_ferr(LIB_ERR_SOCKET,
	168	"%s: Unable to bind to socket: %s",
	169	__PRETTY_FUNCTION__, safe_strerror(errno));
e691f179	170	close(sock);
449a3f5b DS	171	return -1;
449a3f5b DS	172	}
2267994c DS	173	}
2267994c DS	174
d62a17ae	175	if (pimd_privs.change(ZPRIVS_RAISE)) {
3613d898 DS	176	zlog_ferr(LIB_ERR_PRIVILEGES,
	177	"pim_msdp_socket: could not raise privs, %s",
	178	safe_strerror(errno));
d62a17ae	179	}
	180
	181	/* bind to well known TCP port */
	182	rc = bind(sock, (struct sockaddr *)&sin, socklen);
	183
	184	if (pimd_privs.change(ZPRIVS_LOWER)) {
3613d898 DS	185	zlog_ferr(LIB_ERR_PRIVILEGES,
	186	"pim_msdp_socket: could not lower privs, %s",
	187	safe_strerror(errno));
d62a17ae	188	}
	189
	190	if (rc < 0) {
3613d898 DS	191	zlog_ferr(LIB_ERR_SOCKET, "pim_msdp_socket bind to port %d: %s",
3613d898 DS	192	ntohs(sin.sin_port), safe_strerror(errno));
d62a17ae	193	close(sock);
	194	return rc;
	195	}
	196
	197	rc = listen(sock, 3 /* backlog */);
	198	if (rc < 0) {
3613d898 DS	199	zlog_ferr(LIB_ERR_SOCKET, "pim_msdp_socket listen: %s",
3613d898 DS	200	safe_strerror(errno));
d62a17ae	201	close(sock);
	202	return rc;
	203	}
	204
	205	/* add accept thread */
	206	listener->fd = sock;
	207	memcpy(&listener->su, &sin, socklen);
	208	listener->thread = NULL;
472ad383	209	thread_add_read(pim->msdp.master, pim_msdp_sock_accept, pim, sock,
d62a17ae	210	&listener->thread);
d62a17ae	211
472ad383	212	pim->msdp.flags \|= PIM_MSDPF_LISTENER;
d62a17ae	213	return 0;
2a333e0f	214	}
	215
	216	/* active peer socket setup */
d62a17ae	217	int pim_msdp_sock_connect(struct pim_msdp_peer *mp)
2a333e0f	218	{
d62a17ae	219	int rc;
	220
	221	if (PIM_DEBUG_MSDP_INTERNAL) {
	222	zlog_debug("MSDP peer %s attempt connect%s", mp->key_str,
	223	mp->fd < 0 ? "" : "(dup)");
	224	}
	225
	226	/* if we have an existing connection we need to kill that one
	227	* with this one */
	228	if (mp->fd >= 0) {
	229	if (PIM_DEBUG_MSDP_EVENTS) {
3613d898	230	zlog_notice(
d62a17ae	231	"msdp duplicate connect to %s nuke old connection",
	232	mp->key_str);
	233	}
	234	pim_msdp_peer_stop_tcp_conn(mp, false /* chg_state */);
	235	}
	236
	237	/* Make socket for the peer. */
	238	mp->fd = sockunion_socket(&mp->su_peer);
	239	if (mp->fd < 0) {
3613d898 DS	240	zlog_ferr(LIB_ERR_SOCKET, "pim_msdp_socket socket failure: %s",
3613d898 DS	241	safe_strerror(errno));
d62a17ae	242	return -1;
	243	}
	244
62fde409 DS	245	if (mp->pim->vrf_id != VRF_DEFAULT) {
	246	struct interface *ifp =
	247	if_lookup_by_name(mp->pim->vrf->name, mp->pim->vrf_id);
449a3f5b	248	if (!ifp) {
3613d898 DS	249	zlog_ferr(LIB_ERR_INTERFACE,
	250	"%s: Unable to lookup vrf interface: %s",
	251	__PRETTY_FUNCTION__, mp->pim->vrf->name);
449a3f5b DS	252	return -1;
449a3f5b DS	253	}
e691f179	254	if (pim_socket_bind(mp->fd, ifp)) {
3613d898 DS	255	zlog_ferr(LIB_ERR_SOCKET,
	256	"%s: Unable to bind to socket: %s",
	257	__PRETTY_FUNCTION__, safe_strerror(errno));
e691f179 DS	258	close(mp->fd);
	259	mp->fd = -1;
	260	return -1;
	261	}
62fde409 DS	262	}
62fde409 DS	263
d62a17ae	264	set_nonblocking(mp->fd);
	265
	266	/* Set socket send buffer size */
	267	pim_msdp_update_sock_send_buffer_size(mp->fd);
	268	sockopt_reuseaddr(mp->fd);
	269	sockopt_reuseport(mp->fd);
	270
	271	/* source bind */
	272	rc = sockunion_bind(mp->fd, &mp->su_local, 0, &mp->su_local);
	273	if (rc < 0) {
3613d898 DS	274	zlog_ferr(LIB_ERR_SOCKET,
	275	"pim_msdp_socket connect bind failure: %s",
	276	safe_strerror(errno));
d62a17ae	277	close(mp->fd);
	278	mp->fd = -1;
	279	return rc;
	280	}
	281
	282	/* Connect to the remote mp. */
	283	return (sockunion_connect(mp->fd, &mp->su_peer,
	284	htons(PIM_MSDP_TCP_PORT), 0));
2a333e0f	285	}