[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(EC_LIB_SOCKET,
			     "getsockopt of SO_SNDBUF failed %s",
			     safe_strerror(errno));
		return;
	}

	if (optval < size) {
		if (setsockopt(fd, SOL_SOCKET, SO_SNDBUF, &size, sizeof(size))
		    < 0) {
			flog_err_sys(EC_LIB_SOCKET,
				     "Couldn't increase send buffer: %s",
				     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;

	sockunion_init(&su);

	/* re-register accept thread */
	accept_sock = THREAD_FD(thread);
	if (accept_sock < 0) {
		flog_err(EC_LIB_DEVELOPMENT, "accept_sock is negative value %d",
			 accept_sock);
		return -1;
	}
	pim->msdp.listener.thread = NULL;
	thread_add_read(router->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(EC_LIB_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 %pSU", &su);
		}
		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 %pSU stop old connection",
				&su);
		}
		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(EC_LIB_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(EC_LIB_INTERFACE,
				 "%s: Unable to lookup vrf interface: %s",
				 __func__, pim->vrf->name);
			close(sock);
			return -1;
		}
		if (pim_socket_bind(sock, ifp)) {
			flog_err_sys(EC_LIB_SOCKET,
				     "%s: Unable to bind to socket: %s",
				     __func__, safe_strerror(errno));
			close(sock);
			return -1;
		}
	}

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

	if (rc < 0) {
		flog_err_sys(EC_LIB_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(EC_LIB_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(EC_LIB_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(EC_LIB_INTERFACE,
				 "%s: Unable to lookup vrf interface: %s",
				 __func__, mp->pim->vrf->name);
			return -1;
		}
		if (pim_socket_bind(mp->fd, ifp)) {
			flog_err_sys(EC_LIB_SOCKET,
				     "%s: Unable to bind to socket: %s",
				     __func__, 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(EC_LIB_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) {
450971aa	46	flog_err_sys(EC_LIB_SOCKET,
1d5453d6	47	"getsockopt of SO_SNDBUF failed %s",
09c866e3	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) {
450971aa	55	flog_err_sys(EC_LIB_SOCKET,
1d5453d6	56	"Couldn't increase send buffer: %s",
09c866e3	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;
d62a17ae	70
	71	sockunion_init(&su);
	72
	73	/* re-register accept thread */
	74	accept_sock = THREAD_FD(thread);
	75	if (accept_sock < 0) {
1c50c1c0 QY	76	flog_err(EC_LIB_DEVELOPMENT, "accept_sock is negative value %d",
1c50c1c0 QY	77	accept_sock);
d62a17ae	78	return -1;
d62a17ae	79	}
472ad383	80	pim->msdp.listener.thread = NULL;
36417fcc	81	thread_add_read(router->master, pim_msdp_sock_accept, pim, accept_sock,
472ad383	82	&pim->msdp.listener.thread);
d62a17ae	83
	84	/* accept client connection. */
	85	msdp_sock = sockunion_accept(accept_sock, &su);
	86	if (msdp_sock < 0) {
450971aa	87	flog_err_sys(EC_LIB_SOCKET, "pim_msdp_sock_accept failed (%s)",
09c866e3	88	safe_strerror(errno));
d62a17ae	89	return -1;
	90	}
	91
	92	/* see if have peer config for this */
472ad383	93	mp = pim_msdp_peer_find(pim, su.sin.sin_addr);
d62a17ae	94	if (!mp \|\| !PIM_MSDP_PEER_IS_LISTENER(mp)) {
472ad383	95	++pim->msdp.rejected_accepts;
d62a17ae	96	if (PIM_DEBUG_MSDP_EVENTS) {
298004a1	97	flog_err(EC_PIM_MSDP_PACKET,
6b73800b	98	"msdp peer connection refused from %pSU", &su);
d62a17ae	99	}
	100	close(msdp_sock);
	101	return -1;
	102	}
	103
	104	if (PIM_DEBUG_MSDP_INTERNAL) {
	105	zlog_debug("MSDP peer %s accept success%s", mp->key_str,
	106	mp->fd >= 0 ? "(dup)" : "");
	107	}
	108
	109	/* if we have an existing connection we need to kill that one
	110	* with this one */
	111	if (mp->fd >= 0) {
	112	if (PIM_DEBUG_MSDP_EVENTS) {
3613d898	113	zlog_notice(
6b73800b DS	114	"msdp peer new connection from %pSU stop old connection",
6b73800b DS	115	&su);
d62a17ae	116	}
	117	pim_msdp_peer_stop_tcp_conn(mp, true /* chg_state */);
	118	}
	119	mp->fd = msdp_sock;
	120	set_nonblocking(mp->fd);
	121	pim_msdp_update_sock_send_buffer_size(mp->fd);
	122	pim_msdp_peer_established(mp);
	123	return 0;
2a333e0f	124	}
	125
	126	/* global listener for the MSDP well know TCP port */
472ad383	127	int pim_msdp_sock_listen(struct pim_instance *pim)
2a333e0f	128	{
d62a17ae	129	int sock;
	130	int socklen;
	131	struct sockaddr_in sin;
	132	int rc;
472ad383	133	struct pim_msdp_listener *listener = &pim->msdp.listener;
d62a17ae	134
472ad383	135	if (pim->msdp.flags & PIM_MSDPF_LISTENER) {
d62a17ae	136	/* listener already setup */
	137	return 0;
	138	}
	139
	140	sock = socket(AF_INET, SOCK_STREAM, 0);
	141	if (sock < 0) {
1c50c1c0	142	flog_err_sys(EC_LIB_SOCKET, "socket: %s", safe_strerror(errno));
d62a17ae	143	return sock;
	144	}
	145
	146	memset(&sin, 0, sizeof(struct sockaddr_in));
	147	sin.sin_family = AF_INET;
	148	sin.sin_port = htons(PIM_MSDP_TCP_PORT);
	149	socklen = sizeof(struct sockaddr_in);
2a333e0f	150	#ifdef HAVE_STRUCT_SOCKADDR_IN_SIN_LEN
d62a17ae	151	sin.sin_len = socklen;
2a333e0f	152	#endif /* HAVE_STRUCT_SOCKADDR_IN_SIN_LEN */
2a333e0f	153
d62a17ae	154	sockopt_reuseaddr(sock);
	155	sockopt_reuseport(sock);
	156
2267994c DS	157	if (pim->vrf_id != VRF_DEFAULT) {
2267994c DS	158	struct interface *ifp =
a36898e7	159	if_lookup_by_name(pim->vrf->name, pim->vrf_id);
449a3f5b	160	if (!ifp) {
450971aa	161	flog_err(EC_LIB_INTERFACE,
1c50c1c0	162	"%s: Unable to lookup vrf interface: %s",
5e81f5dd	163	__func__, pim->vrf->name);
e691f179 DS	164	close(sock);
	165	return -1;
	166	}
	167	if (pim_socket_bind(sock, ifp)) {
450971aa	168	flog_err_sys(EC_LIB_SOCKET,
09c866e3	169	"%s: Unable to bind to socket: %s",
5e81f5dd	170	__func__, safe_strerror(errno));
e691f179	171	close(sock);
449a3f5b DS	172	return -1;
449a3f5b DS	173	}
2267994c DS	174	}
2267994c DS	175
0cf6db21	176	frr_with_privs(&pimd_privs) {
6bb30c2c DL	177	/* bind to well known TCP port */
6bb30c2c DL	178	rc = bind(sock, (struct sockaddr *)&sin, socklen);
d62a17ae	179	}
	180
	181	if (rc < 0) {
450971aa	182	flog_err_sys(EC_LIB_SOCKET,
09c866e3 QY	183	"pim_msdp_socket bind to port %d: %s",
09c866e3 QY	184	ntohs(sin.sin_port), safe_strerror(errno));
d62a17ae	185	close(sock);
	186	return rc;
	187	}
	188
	189	rc = listen(sock, 3 /* backlog */);
	190	if (rc < 0) {
450971aa	191	flog_err_sys(EC_LIB_SOCKET, "pim_msdp_socket listen: %s",
09c866e3	192	safe_strerror(errno));
d62a17ae	193	close(sock);
	194	return rc;
	195	}
	196
	197	/* add accept thread */
	198	listener->fd = sock;
	199	memcpy(&listener->su, &sin, socklen);
	200	listener->thread = NULL;
472ad383	201	thread_add_read(pim->msdp.master, pim_msdp_sock_accept, pim, sock,
d62a17ae	202	&listener->thread);
d62a17ae	203
472ad383	204	pim->msdp.flags \|= PIM_MSDPF_LISTENER;
d62a17ae	205	return 0;
2a333e0f	206	}
	207
	208	/* active peer socket setup */
d62a17ae	209	int pim_msdp_sock_connect(struct pim_msdp_peer *mp)
2a333e0f	210	{
d62a17ae	211	int rc;
	212
	213	if (PIM_DEBUG_MSDP_INTERNAL) {
	214	zlog_debug("MSDP peer %s attempt connect%s", mp->key_str,
	215	mp->fd < 0 ? "" : "(dup)");
	216	}
	217
	218	/* if we have an existing connection we need to kill that one
	219	* with this one */
	220	if (mp->fd >= 0) {
	221	if (PIM_DEBUG_MSDP_EVENTS) {
3613d898	222	zlog_notice(
d62a17ae	223	"msdp duplicate connect to %s nuke old connection",
	224	mp->key_str);
	225	}
	226	pim_msdp_peer_stop_tcp_conn(mp, false /* chg_state */);
	227	}
	228
	229	/* Make socket for the peer. */
	230	mp->fd = sockunion_socket(&mp->su_peer);
	231	if (mp->fd < 0) {
450971aa	232	flog_err_sys(EC_LIB_SOCKET,
09c866e3 QY	233	"pim_msdp_socket socket failure: %s",
09c866e3 QY	234	safe_strerror(errno));
d62a17ae	235	return -1;
	236	}
	237
62fde409 DS	238	if (mp->pim->vrf_id != VRF_DEFAULT) {
62fde409 DS	239	struct interface *ifp =
a36898e7	240	if_lookup_by_name(mp->pim->vrf->name, mp->pim->vrf_id);
449a3f5b	241	if (!ifp) {
450971aa	242	flog_err(EC_LIB_INTERFACE,
1c50c1c0	243	"%s: Unable to lookup vrf interface: %s",
15569c58	244	__func__, mp->pim->vrf->name);
449a3f5b DS	245	return -1;
449a3f5b DS	246	}
e691f179	247	if (pim_socket_bind(mp->fd, ifp)) {
450971aa	248	flog_err_sys(EC_LIB_SOCKET,
09c866e3	249	"%s: Unable to bind to socket: %s",
15569c58	250	__func__, safe_strerror(errno));
e691f179 DS	251	close(mp->fd);
	252	mp->fd = -1;
	253	return -1;
	254	}
62fde409 DS	255	}
62fde409 DS	256
d62a17ae	257	set_nonblocking(mp->fd);
	258
	259	/* Set socket send buffer size */
	260	pim_msdp_update_sock_send_buffer_size(mp->fd);
	261	sockopt_reuseaddr(mp->fd);
	262	sockopt_reuseport(mp->fd);
	263
	264	/* source bind */
	265	rc = sockunion_bind(mp->fd, &mp->su_local, 0, &mp->su_local);
	266	if (rc < 0) {
450971aa	267	flog_err_sys(EC_LIB_SOCKET,
09c866e3 QY	268	"pim_msdp_socket connect bind failure: %s",
09c866e3 QY	269	safe_strerror(errno));
d62a17ae	270	close(mp->fd);
	271	mp->fd = -1;
	272	return rc;
	273	}
	274
	275	/* Connect to the remote mp. */
	276	return (sockunion_connect(mp->fd, &mp->su_peer,
	277	htons(PIM_MSDP_TCP_PORT), 0));
2a333e0f	278	}