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/*
* BFD daemon code
* Copyright (C) 2018 Network Device Education Foundation, Inc. ("NetDEF")
*
* FRR 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, or (at your option) any
* later version.
*
* FRR 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 FRR; see the file COPYING. If not, write to the Free
* Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
* 02111-1307, USA.
*/
#include <zebra.h>
#include "bfd.h"
#include "lib/version.h"
/*
* FRR related code.
*/
DEFINE_MGROUP(BFDD, "Bidirectional Forwarding Detection Daemon");
DEFINE_MTYPE(BFDD, BFDD_TMP, "short-lived temporary memory");
DEFINE_MTYPE(BFDD, BFDD_CONFIG, "long-lived configuration memory");
DEFINE_MTYPE(BFDD, BFDD_LABEL, "long-lived label memory");
DEFINE_MTYPE(BFDD, BFDD_CONTROL, "long-lived control socket memory");
DEFINE_MTYPE(BFDD, BFDD_SESSION_OBSERVER, "Session observer");
DEFINE_MTYPE(BFDD, BFDD_NOTIFICATION, "short-lived control notification data");
/* Master of threads. */
struct thread_master *master;
/* BFDd privileges */
static zebra_capabilities_t _caps_p[] = {ZCAP_BIND};
struct zebra_privs_t bfdd_privs = {
#if defined(FRR_USER) && defined(FRR_GROUP)
.user = FRR_USER,
.group = FRR_GROUP,
#endif
#if defined(VTY_GROUP)
.vty_group = VTY_GROUP,
#endif
.caps_p = _caps_p,
.cap_num_p = array_size(_caps_p),
.cap_num_i = 0,
};
void socket_close(int *s)
{
if (*s <= 0)
return;
if (close(*s) != 0)
log_error("%s: close(%d): (%d) %s", __func__, *s, errno,
strerror(errno));
*s = -1;
}
static void sigusr1_handler(void)
{
zlog_rotate();
}
static void sigterm_handler(void)
{
/* Signalize shutdown. */
frr_early_fini();
/* Stop receiving message from zebra. */
bfdd_zclient_stop();
/* Shutdown controller to avoid receiving anymore commands. */
control_shutdown();
/* Shutdown and free all protocol related memory. */
bfd_shutdown();
/* Close all descriptors. */
socket_close(&bglobal.bg_echo);
socket_close(&bglobal.bg_shop);
socket_close(&bglobal.bg_mhop);
socket_close(&bglobal.bg_shop6);
socket_close(&bglobal.bg_mhop6);
/* Terminate and free() FRR related memory. */
frr_fini();
exit(0);
}
static struct quagga_signal_t bfd_signals[] = {
{
.signal = SIGUSR1,
.handler = &sigusr1_handler,
},
{
.signal = SIGTERM,
.handler = &sigterm_handler,
},
{
.signal = SIGINT,
.handler = &sigterm_handler,
},
};
FRR_DAEMON_INFO(bfdd, BFD, .vty_port = 2617,
.proghelp = "Implementation of the BFD protocol.",
.signals = bfd_signals, .n_signals = array_size(bfd_signals),
.privs = &bfdd_privs)
#define OPTION_CTLSOCK 1001
static struct option longopts[] = {
{"bfdctl", required_argument, NULL, OPTION_CTLSOCK},
{0}
};
/*
* BFD daemon related code.
*/
struct bfd_global bglobal;
struct bfd_diag_str_list diag_list[] = {
{.str = "control-expired", .type = BD_CONTROL_EXPIRED},
{.str = "echo-failed", .type = BD_ECHO_FAILED},
{.str = "neighbor-down", .type = BD_NEIGHBOR_DOWN},
{.str = "forwarding-reset", .type = BD_FORWARDING_RESET},
{.str = "path-down", .type = BD_PATH_DOWN},
{.str = "concatenated-path-down", .type = BD_CONCATPATH_DOWN},
{.str = "administratively-down", .type = BD_ADMIN_DOWN},
{.str = "reverse-concat-path-down", .type = BD_REVCONCATPATH_DOWN},
{.str = NULL},
};
struct bfd_state_str_list state_list[] = {
{.str = "admin-down", .type = PTM_BFD_ADM_DOWN},
{.str = "down", .type = PTM_BFD_DOWN},
{.str = "init", .type = PTM_BFD_INIT},
{.str = "up", .type = PTM_BFD_UP},
{.str = NULL},
};
static void bg_init(void)
{
TAILQ_INIT(&bglobal.bg_bcslist);
TAILQ_INIT(&bglobal.bg_obslist);
bglobal.bg_shop = bp_udp_shop();
bglobal.bg_mhop = bp_udp_mhop();
bglobal.bg_shop6 = bp_udp6_shop();
bglobal.bg_mhop6 = bp_udp6_mhop();
bglobal.bg_echo = bp_echo_socket();
bglobal.bg_echov6 = bp_echov6_socket();
}
int main(int argc, char *argv[])
{
const char *ctl_path = BFDD_CONTROL_SOCKET;
int opt;
frr_preinit(&bfdd_di, argc, argv);
frr_opt_add("", longopts,
" --bfdctl Specify bfdd control socket\n");
while (true) {
opt = frr_getopt(argc, argv, NULL);
if (opt == EOF)
break;
switch (opt) {
case OPTION_CTLSOCK:
ctl_path = optarg;
break;
default:
frr_help_exit(1);
break;
}
}
#if 0 /* TODO add support for JSON configuration files. */
parse_config(conf);
#endif
/* Initialize logging API. */
log_init(1, BLOG_DEBUG, &bfdd_di);
/* Initialize system sockets. */
bg_init();
/* Initialize control socket. */
control_init(ctl_path);
/* Initialize FRR infrastructure. */
master = frr_init();
/* Initialize BFD data structures. */
bfd_initialize();
/* Initialize zebra connection. */
bfdd_zclient_init(&bfdd_privs);
/* Add descriptors to the event loop. */
thread_add_read(master, bfd_recv_cb, NULL, bglobal.bg_shop,
&bglobal.bg_ev[0]);
thread_add_read(master, bfd_recv_cb, NULL, bglobal.bg_mhop,
&bglobal.bg_ev[1]);
thread_add_read(master, bfd_recv_cb, NULL, bglobal.bg_shop6,
&bglobal.bg_ev[2]);
thread_add_read(master, bfd_recv_cb, NULL, bglobal.bg_mhop6,
&bglobal.bg_ev[3]);
thread_add_read(master, bfd_recv_cb, NULL, bglobal.bg_echo,
&bglobal.bg_ev[4]);
thread_add_read(master, bfd_recv_cb, NULL, bglobal.bg_echov6,
&bglobal.bg_ev[5]);
thread_add_read(master, control_accept, NULL, bglobal.bg_csock,
&bglobal.bg_csockev);
/* Install commands. */
bfdd_vty_init();
/* read configuration file and daemonize */
frr_config_fork();
frr_run(master);
/* NOTREACHED */
return 0;
}
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