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/*
* 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 "pimd.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_err("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_err("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_msdp_listener *listener = 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_err ("accept_sock is negative value %d", accept_sock);
return -1;
}
listener->thread = NULL;
thread_add_read(master, pim_msdp_sock_accept, listener, accept_sock,
&listener->thread);
/* accept client connection. */
msdp_sock = sockunion_accept(accept_sock, &su);
if (msdp_sock < 0) {
zlog_err ("pim_msdp_sock_accept failed (%s)", safe_strerror (errno));
return -1;
}
/* see if have peer config for this */
mp = pim_msdp_peer_find(su.sin.sin_addr);
if (!mp || !PIM_MSDP_PEER_IS_LISTENER(mp)) {
++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_err("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(void)
{
int sock;
int socklen;
struct sockaddr_in sin;
int rc;
struct pim_msdp_listener *listener = &msdp->listener;
if (msdp->flags & PIM_MSDPF_LISTENER) {
/* listener already setup */
return 0;
}
sock = socket(AF_INET, SOCK_STREAM, 0);
if (sock < 0) {
zlog_err ("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 (pimd_privs.change(ZPRIVS_RAISE)) {
zlog_err ("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_err ("pim_msdp_socket: could not lower privs, %s",
safe_strerror (errno));
}
if (rc < 0) {
zlog_err ("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_err ("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(msdp->master, pim_msdp_sock_accept, listener, sock,
&listener->thread);
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_err("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_err ("pim_msdp_socket socket failure: %s", safe_strerror (errno));
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_err ("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));
}
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