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// SPDX-License-Identifier: GPL-2.0-or-later
/*
* IP MSDP socket management
* Copyright (C) 2016 Cumulus Networks, Inc.
*/
#include <zebra.h>
#include <lib/log.h>
#include <lib/network.h>
#include <lib/sockunion.h>
#include "event.h"
#include <lib/vty.h>
#include <lib/if.h>
#include <lib/vrf.h>
#include <lib/lib_errors.h>
#include "pimd.h"
#include "pim_instance.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 void 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;
}
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;
}
/* 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;
}
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);
}
/* 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->vrf_id != VRF_DEFAULT) {
struct interface *ifp =
if_lookup_by_name(pim->vrf->name, pim->vrf->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);
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->vrf_id != VRF_DEFAULT) {
struct interface *ifp = if_lookup_by_name(mp->pim->vrf->name,
mp->pim->vrf->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));
}
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