[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"

#include "sockopt.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;
	}

	/* Set socket DSCP byte */
	if (setsockopt_ipv4_tos(sock, IPTOS_PREC_INTERNETCONTROL)) {
		zlog_warn("can't set sockopt IP_TOS to MSDP socket %d: %s",
				sock, safe_strerror(errno));
	}

	/* 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;
	}

	/* Set socket DSCP byte */
	if (setsockopt_ipv4_tos(mp->fd, IPTOS_PREC_INTERNETCONTROL)) {
		zlog_warn("can't set sockopt IP_TOS to MSDP socket %d: %s",
				mp->fd, safe_strerror(errno));
	}

	/* 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
b069b568 AMR	38	#include "sockopt.h"
b069b568 AMR	39
2a333e0f	40	/* increase socket send buffer size */
d62a17ae	41	static void pim_msdp_update_sock_send_buffer_size(int fd)
2a333e0f	42	{
d62a17ae	43	int size = PIM_MSDP_SOCKET_SNDBUF_SIZE;
	44	int optval;
	45	socklen_t optlen = sizeof(optval);
	46
	47	if (getsockopt(fd, SOL_SOCKET, SO_SNDBUF, &optval, &optlen) < 0) {
450971aa	48	flog_err_sys(EC_LIB_SOCKET,
1d5453d6	49	"getsockopt of SO_SNDBUF failed %s",
09c866e3	50	safe_strerror(errno));
d62a17ae	51	return;
	52	}
	53
	54	if (optval < size) {
	55	if (setsockopt(fd, SOL_SOCKET, SO_SNDBUF, &size, sizeof(size))
	56	< 0) {
450971aa	57	flog_err_sys(EC_LIB_SOCKET,
1d5453d6	58	"Couldn't increase send buffer: %s",
09c866e3	59	safe_strerror(errno));
d62a17ae	60	}
d62a17ae	61	}
2a333e0f	62	}
	63
	64	/* passive peer socket accept */
d62a17ae	65	static int pim_msdp_sock_accept(struct thread *thread)
2a333e0f	66	{
d62a17ae	67	union sockunion su;
472ad383	68	struct pim_instance *pim = THREAD_ARG(thread);
d62a17ae	69	int accept_sock;
	70	int msdp_sock;
	71	struct pim_msdp_peer *mp;
d62a17ae	72
	73	sockunion_init(&su);
	74
	75	/* re-register accept thread */
	76	accept_sock = THREAD_FD(thread);
	77	if (accept_sock < 0) {
1c50c1c0 QY	78	flog_err(EC_LIB_DEVELOPMENT, "accept_sock is negative value %d",
1c50c1c0 QY	79	accept_sock);
d62a17ae	80	return -1;
d62a17ae	81	}
472ad383	82	pim->msdp.listener.thread = NULL;
36417fcc	83	thread_add_read(router->master, pim_msdp_sock_accept, pim, accept_sock,
472ad383	84	&pim->msdp.listener.thread);
d62a17ae	85
	86	/* accept client connection. */
	87	msdp_sock = sockunion_accept(accept_sock, &su);
	88	if (msdp_sock < 0) {
450971aa	89	flog_err_sys(EC_LIB_SOCKET, "pim_msdp_sock_accept failed (%s)",
09c866e3	90	safe_strerror(errno));
d62a17ae	91	return -1;
	92	}
	93
	94	/* see if have peer config for this */
472ad383	95	mp = pim_msdp_peer_find(pim, su.sin.sin_addr);
d62a17ae	96	if (!mp \|\| !PIM_MSDP_PEER_IS_LISTENER(mp)) {
472ad383	97	++pim->msdp.rejected_accepts;
d62a17ae	98	if (PIM_DEBUG_MSDP_EVENTS) {
298004a1	99	flog_err(EC_PIM_MSDP_PACKET,
6b73800b	100	"msdp peer connection refused from %pSU", &su);
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(
6b73800b DS	116	"msdp peer new connection from %pSU stop old connection",
6b73800b DS	117	&su);
d62a17ae	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) {
1c50c1c0	144	flog_err_sys(EC_LIB_SOCKET, "socket: %s", safe_strerror(errno));
d62a17ae	145	return sock;
	146	}
	147
	148	memset(&sin, 0, sizeof(struct sockaddr_in));
	149	sin.sin_family = AF_INET;
	150	sin.sin_port = htons(PIM_MSDP_TCP_PORT);
	151	socklen = sizeof(struct sockaddr_in);
2a333e0f	152	#ifdef HAVE_STRUCT_SOCKADDR_IN_SIN_LEN
d62a17ae	153	sin.sin_len = socklen;
2a333e0f	154	#endif /* HAVE_STRUCT_SOCKADDR_IN_SIN_LEN */
2a333e0f	155
d62a17ae	156	sockopt_reuseaddr(sock);
	157	sockopt_reuseport(sock);
	158
2267994c DS	159	if (pim->vrf_id != VRF_DEFAULT) {
2267994c DS	160	struct interface *ifp =
a36898e7	161	if_lookup_by_name(pim->vrf->name, pim->vrf_id);
449a3f5b	162	if (!ifp) {
450971aa	163	flog_err(EC_LIB_INTERFACE,
1c50c1c0	164	"%s: Unable to lookup vrf interface: %s",
5e81f5dd	165	__func__, pim->vrf->name);
e691f179 DS	166	close(sock);
	167	return -1;
	168	}
	169	if (pim_socket_bind(sock, ifp)) {
450971aa	170	flog_err_sys(EC_LIB_SOCKET,
09c866e3	171	"%s: Unable to bind to socket: %s",
5e81f5dd	172	__func__, safe_strerror(errno));
e691f179	173	close(sock);
449a3f5b DS	174	return -1;
449a3f5b DS	175	}
2267994c DS	176	}
2267994c DS	177
0cf6db21	178	frr_with_privs(&pimd_privs) {
6bb30c2c DL	179	/* bind to well known TCP port */
6bb30c2c DL	180	rc = bind(sock, (struct sockaddr *)&sin, socklen);
d62a17ae	181	}
	182
	183	if (rc < 0) {
450971aa	184	flog_err_sys(EC_LIB_SOCKET,
09c866e3 QY	185	"pim_msdp_socket bind to port %d: %s",
09c866e3 QY	186	ntohs(sin.sin_port), safe_strerror(errno));
d62a17ae	187	close(sock);
	188	return rc;
	189	}
	190
	191	rc = listen(sock, 3 /* backlog */);
	192	if (rc < 0) {
450971aa	193	flog_err_sys(EC_LIB_SOCKET, "pim_msdp_socket listen: %s",
09c866e3	194	safe_strerror(errno));
d62a17ae	195	close(sock);
	196	return rc;
	197	}
	198
b069b568 AMR	199	/* Set socket DSCP byte */
	200	if (setsockopt_ipv4_tos(sock, IPTOS_PREC_INTERNETCONTROL)) {
	201	zlog_warn("can't set sockopt IP_TOS to MSDP socket %d: %s",
	202	sock, safe_strerror(errno));
	203	}
	204
d62a17ae	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) {
450971aa	240	flog_err_sys(EC_LIB_SOCKET,
09c866e3 QY	241	"pim_msdp_socket socket failure: %s",
09c866e3 QY	242	safe_strerror(errno));
d62a17ae	243	return -1;
	244	}
	245
62fde409 DS	246	if (mp->pim->vrf_id != VRF_DEFAULT) {
62fde409 DS	247	struct interface *ifp =
a36898e7	248	if_lookup_by_name(mp->pim->vrf->name, mp->pim->vrf_id);
449a3f5b	249	if (!ifp) {
450971aa	250	flog_err(EC_LIB_INTERFACE,
1c50c1c0	251	"%s: Unable to lookup vrf interface: %s",
15569c58	252	__func__, mp->pim->vrf->name);
449a3f5b DS	253	return -1;
449a3f5b DS	254	}
e691f179	255	if (pim_socket_bind(mp->fd, ifp)) {
450971aa	256	flog_err_sys(EC_LIB_SOCKET,
09c866e3	257	"%s: Unable to bind to socket: %s",
15569c58	258	__func__, safe_strerror(errno));
e691f179 DS	259	close(mp->fd);
	260	mp->fd = -1;
	261	return -1;
	262	}
62fde409 DS	263	}
62fde409 DS	264
d62a17ae	265	set_nonblocking(mp->fd);
	266
	267	/* Set socket send buffer size */
	268	pim_msdp_update_sock_send_buffer_size(mp->fd);
	269	sockopt_reuseaddr(mp->fd);
	270	sockopt_reuseport(mp->fd);
	271
	272	/* source bind */
	273	rc = sockunion_bind(mp->fd, &mp->su_local, 0, &mp->su_local);
	274	if (rc < 0) {
450971aa	275	flog_err_sys(EC_LIB_SOCKET,
09c866e3 QY	276	"pim_msdp_socket connect bind failure: %s",
09c866e3 QY	277	safe_strerror(errno));
d62a17ae	278	close(mp->fd);
	279	mp->fd = -1;
	280	return rc;
	281	}
	282
b069b568 AMR	283	/* Set socket DSCP byte */
	284	if (setsockopt_ipv4_tos(mp->fd, IPTOS_PREC_INTERNETCONTROL)) {
	285	zlog_warn("can't set sockopt IP_TOS to MSDP socket %d: %s",
	286	mp->fd, safe_strerror(errno));
	287	}
	288
d62a17ae	289	/* Connect to the remote mp. */
	290	return (sockunion_connect(mp->fd, &mp->su_peer,
	291	htons(PIM_MSDP_TCP_PORT), 0));
2a333e0f	292	}