[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_errors.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) {
		flog_err_sys(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) {
			flog_err_sys(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) {
		flog_err(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) {
		flog_err_sys(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) {
			flog_err(EC_PIM_MSDP_PACKET,
				  "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) {
		flog_err_sys(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) {
			flog_err(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)) {
			flog_err_sys(LIB_ERR_SOCKET,
				     "%s: Unable to bind to socket: %s",
				     __PRETTY_FUNCTION__, safe_strerror(errno));
			close(sock);
			return -1;
		}
	}

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

	if (rc < 0) {
		flog_err_sys(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) {
		flog_err_sys(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) {
		flog_err_sys(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) {
			flog_err(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)) {
			flog_err_sys(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) {
		flog_err_sys(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"
d9ff4302	33	#include "pim_errors.h"
2a333e0f	34
	35	#include "pim_msdp.h"
	36	#include "pim_msdp_socket.h"
	37
2a333e0f	38	/* increase socket send buffer size */
d62a17ae	39	static void pim_msdp_update_sock_send_buffer_size(int fd)
2a333e0f	40	{
d62a17ae	41	int size = PIM_MSDP_SOCKET_SNDBUF_SIZE;
	42	int optval;
	43	socklen_t optlen = sizeof(optval);
	44
	45	if (getsockopt(fd, SOL_SOCKET, SO_SNDBUF, &optval, &optlen) < 0) {
09c866e3 QY	46	flog_err_sys(LIB_ERR_SOCKET,
	47	"getsockopt of SO_SNDBUF failed %s\n",
	48	safe_strerror(errno));
d62a17ae	49	return;
	50	}
	51
	52	if (optval < size) {
	53	if (setsockopt(fd, SOL_SOCKET, SO_SNDBUF, &size, sizeof(size))
	54	< 0) {
09c866e3 QY	55	flog_err_sys(LIB_ERR_SOCKET,
	56	"Couldn't increase send buffer: %s\n",
	57	safe_strerror(errno));
d62a17ae	58	}
d62a17ae	59	}
2a333e0f	60	}
	61
	62	/* passive peer socket accept */
d62a17ae	63	static int pim_msdp_sock_accept(struct thread *thread)
2a333e0f	64	{
d62a17ae	65	union sockunion su;
472ad383	66	struct pim_instance *pim = THREAD_ARG(thread);
d62a17ae	67	int accept_sock;
	68	int msdp_sock;
	69	struct pim_msdp_peer *mp;
	70	char buf[SU_ADDRSTRLEN];
	71
	72	sockunion_init(&su);
	73
	74	/* re-register accept thread */
	75	accept_sock = THREAD_FD(thread);
	76	if (accept_sock < 0) {
af4c2728	77	flog_err(LIB_ERR_DEVELOPMENT,
3613d898	78	"accept_sock is negative value %d", accept_sock);
d62a17ae	79	return -1;
d62a17ae	80	}
472ad383 DS	81	pim->msdp.listener.thread = NULL;
	82	thread_add_read(master, pim_msdp_sock_accept, pim, accept_sock,
	83	&pim->msdp.listener.thread);
d62a17ae	84
	85	/* accept client connection. */
	86	msdp_sock = sockunion_accept(accept_sock, &su);
	87	if (msdp_sock < 0) {
09c866e3 QY	88	flog_err_sys(LIB_ERR_SOCKET, "pim_msdp_sock_accept failed (%s)",
09c866e3 QY	89	safe_strerror(errno));
d62a17ae	90	return -1;
	91	}
	92
	93	/* see if have peer config for this */
472ad383	94	mp = pim_msdp_peer_find(pim, su.sin.sin_addr);
d62a17ae	95	if (!mp \|\| !PIM_MSDP_PEER_IS_LISTENER(mp)) {
472ad383	96	++pim->msdp.rejected_accepts;
d62a17ae	97	if (PIM_DEBUG_MSDP_EVENTS) {
298004a1	98	flog_err(EC_PIM_MSDP_PACKET,
d9ff4302 DS	99	"msdp peer connection refused from %s",
d9ff4302 DS	100	sockunion2str(&su, buf, SU_ADDRSTRLEN));
d62a17ae	101	}
	102	close(msdp_sock);
	103	return -1;
	104	}
	105
	106	if (PIM_DEBUG_MSDP_INTERNAL) {
	107	zlog_debug("MSDP peer %s accept success%s", mp->key_str,
	108	mp->fd >= 0 ? "(dup)" : "");
	109	}
	110
	111	/* if we have an existing connection we need to kill that one
	112	* with this one */
	113	if (mp->fd >= 0) {
	114	if (PIM_DEBUG_MSDP_EVENTS) {
3613d898	115	zlog_notice(
d62a17ae	116	"msdp peer new connection from %s stop old connection",
	117	sockunion2str(&su, buf, SU_ADDRSTRLEN));
	118	}
	119	pim_msdp_peer_stop_tcp_conn(mp, true /* chg_state */);
	120	}
	121	mp->fd = msdp_sock;
	122	set_nonblocking(mp->fd);
	123	pim_msdp_update_sock_send_buffer_size(mp->fd);
	124	pim_msdp_peer_established(mp);
	125	return 0;
2a333e0f	126	}
	127
	128	/* global listener for the MSDP well know TCP port */
472ad383	129	int pim_msdp_sock_listen(struct pim_instance *pim)
2a333e0f	130	{
d62a17ae	131	int sock;
	132	int socklen;
	133	struct sockaddr_in sin;
	134	int rc;
472ad383	135	struct pim_msdp_listener *listener = &pim->msdp.listener;
d62a17ae	136
472ad383	137	if (pim->msdp.flags & PIM_MSDPF_LISTENER) {
d62a17ae	138	/* listener already setup */
	139	return 0;
	140	}
	141
	142	sock = socket(AF_INET, SOCK_STREAM, 0);
	143	if (sock < 0) {
09c866e3 QY	144	flog_err_sys(LIB_ERR_SOCKET, "socket: %s",
09c866e3 QY	145	safe_strerror(errno));
d62a17ae	146	return sock;
	147	}
	148
	149	memset(&sin, 0, sizeof(struct sockaddr_in));
	150	sin.sin_family = AF_INET;
	151	sin.sin_port = htons(PIM_MSDP_TCP_PORT);
	152	socklen = sizeof(struct sockaddr_in);
2a333e0f	153	#ifdef HAVE_STRUCT_SOCKADDR_IN_SIN_LEN
d62a17ae	154	sin.sin_len = socklen;
2a333e0f	155	#endif /* HAVE_STRUCT_SOCKADDR_IN_SIN_LEN */
2a333e0f	156
d62a17ae	157	sockopt_reuseaddr(sock);
	158	sockopt_reuseport(sock);
	159
2267994c DS	160	if (pim->vrf_id != VRF_DEFAULT) {
	161	struct interface *ifp =
	162	if_lookup_by_name(pim->vrf->name, pim->vrf_id);
449a3f5b	163	if (!ifp) {
af4c2728	164	flog_err(LIB_ERR_INTERFACE,
3613d898 DS	165	"%s: Unable to lookup vrf interface: %s",
3613d898 DS	166	__PRETTY_FUNCTION__, pim->vrf->name);
e691f179 DS	167	close(sock);
	168	return -1;
	169	}
	170	if (pim_socket_bind(sock, ifp)) {
09c866e3 QY	171	flog_err_sys(LIB_ERR_SOCKET,
	172	"%s: Unable to bind to socket: %s",
	173	__PRETTY_FUNCTION__, safe_strerror(errno));
e691f179	174	close(sock);
449a3f5b DS	175	return -1;
449a3f5b DS	176	}
2267994c DS	177	}
2267994c DS	178
6bb30c2c DL	179	frr_elevate_privs(&pimd_privs) {
	180	/* bind to well known TCP port */
	181	rc = bind(sock, (struct sockaddr *)&sin, socklen);
d62a17ae	182	}
	183
	184	if (rc < 0) {
09c866e3 QY	185	flog_err_sys(LIB_ERR_SOCKET,
	186	"pim_msdp_socket bind to port %d: %s",
	187	ntohs(sin.sin_port), safe_strerror(errno));
d62a17ae	188	close(sock);
	189	return rc;
	190	}
	191
	192	rc = listen(sock, 3 /* backlog */);
	193	if (rc < 0) {
09c866e3 QY	194	flog_err_sys(LIB_ERR_SOCKET, "pim_msdp_socket listen: %s",
09c866e3 QY	195	safe_strerror(errno));
d62a17ae	196	close(sock);
	197	return rc;
	198	}
	199
	200	/* add accept thread */
	201	listener->fd = sock;
	202	memcpy(&listener->su, &sin, socklen);
	203	listener->thread = NULL;
472ad383	204	thread_add_read(pim->msdp.master, pim_msdp_sock_accept, pim, sock,
d62a17ae	205	&listener->thread);
d62a17ae	206
472ad383	207	pim->msdp.flags \|= PIM_MSDPF_LISTENER;
d62a17ae	208	return 0;
2a333e0f	209	}
	210
	211	/* active peer socket setup */
d62a17ae	212	int pim_msdp_sock_connect(struct pim_msdp_peer *mp)
2a333e0f	213	{
d62a17ae	214	int rc;
	215
	216	if (PIM_DEBUG_MSDP_INTERNAL) {
	217	zlog_debug("MSDP peer %s attempt connect%s", mp->key_str,
	218	mp->fd < 0 ? "" : "(dup)");
	219	}
	220
	221	/* if we have an existing connection we need to kill that one
	222	* with this one */
	223	if (mp->fd >= 0) {
	224	if (PIM_DEBUG_MSDP_EVENTS) {
3613d898	225	zlog_notice(
d62a17ae	226	"msdp duplicate connect to %s nuke old connection",
	227	mp->key_str);
	228	}
	229	pim_msdp_peer_stop_tcp_conn(mp, false /* chg_state */);
	230	}
	231
	232	/* Make socket for the peer. */
	233	mp->fd = sockunion_socket(&mp->su_peer);
	234	if (mp->fd < 0) {
09c866e3 QY	235	flog_err_sys(LIB_ERR_SOCKET,
	236	"pim_msdp_socket socket failure: %s",
	237	safe_strerror(errno));
d62a17ae	238	return -1;
	239	}
	240
62fde409 DS	241	if (mp->pim->vrf_id != VRF_DEFAULT) {
	242	struct interface *ifp =
	243	if_lookup_by_name(mp->pim->vrf->name, mp->pim->vrf_id);
449a3f5b	244	if (!ifp) {
af4c2728	245	flog_err(LIB_ERR_INTERFACE,
3613d898 DS	246	"%s: Unable to lookup vrf interface: %s",
3613d898 DS	247	__PRETTY_FUNCTION__, mp->pim->vrf->name);
449a3f5b DS	248	return -1;
449a3f5b DS	249	}
e691f179	250	if (pim_socket_bind(mp->fd, ifp)) {
09c866e3 QY	251	flog_err_sys(LIB_ERR_SOCKET,
	252	"%s: Unable to bind to socket: %s",
	253	__PRETTY_FUNCTION__, safe_strerror(errno));
e691f179 DS	254	close(mp->fd);
	255	mp->fd = -1;
	256	return -1;
	257	}
62fde409 DS	258	}
62fde409 DS	259
d62a17ae	260	set_nonblocking(mp->fd);
	261
	262	/* Set socket send buffer size */
	263	pim_msdp_update_sock_send_buffer_size(mp->fd);
	264	sockopt_reuseaddr(mp->fd);
	265	sockopt_reuseport(mp->fd);
	266
	267	/* source bind */
	268	rc = sockunion_bind(mp->fd, &mp->su_local, 0, &mp->su_local);
	269	if (rc < 0) {
09c866e3 QY	270	flog_err_sys(LIB_ERR_SOCKET,
	271	"pim_msdp_socket connect bind failure: %s",
	272	safe_strerror(errno));
d62a17ae	273	close(mp->fd);
	274	mp->fd = -1;
	275	return rc;
	276	}
	277
	278	/* Connect to the remote mp. */
	279	return (sockunion_connect(mp->fd, &mp->su_peer,
	280	htons(PIM_MSDP_TCP_PORT), 0));
2a333e0f	281	}