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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 <arpa/inet.h>
#include <netinet/in.h>
#include <sys/socket.h>
#include <sys/un.h>
#include <err.h>
#include "filter.h"
#include "if.h"
#include "vrf.h"
#include "bfd.h"
#include "bfdd_nb.h"
#include "bfddp_packet.h"
#include "lib/version.h"
#include "lib/command.h"
/*
* FRR related code.
*/
DEFINE_MGROUP(BFDD, "Bidirectional Forwarding Detection Daemon");
DEFINE_MTYPE(BFDD, BFDD_CONTROL, "long-lived control socket memory");
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, ZCAP_SYS_ADMIN, ZCAP_NET_RAW};
/* BFD daemon information. */
static struct frr_daemon_info bfdd_di;
void socket_close(int *s)
{
if (*s <= 0)
return;
if (close(*s) != 0)
zlog_err("%s: close(%d): (%d) %s", __func__, *s, errno,
strerror(errno));
*s = -1;
}
static void sigusr1_handler(void)
{
zlog_rotate();
}
static void sigterm_handler(void)
{
bglobal.bg_shutdown = true;
/* 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();
bfd_vrf_terminate();
/* Terminate and free() FRR related memory. */
frr_fini();
exit(0);
}
static void sighup_handler(void)
{
zlog_info("SIGHUP received");
/* Reload config file. */
vty_read_config(NULL, bfdd_di.config_file, config_default);
}
static struct quagga_signal_t bfd_signals[] = {
{
.signal = SIGUSR1,
.handler = &sigusr1_handler,
},
{
.signal = SIGTERM,
.handler = &sigterm_handler,
},
{
.signal = SIGINT,
.handler = &sigterm_handler,
},
{
.signal = SIGHUP,
.handler = &sighup_handler,
},
};
static const struct frr_yang_module_info *const bfdd_yang_modules[] = {
&frr_filter_info,
&frr_interface_info,
&frr_bfdd_info,
&frr_vrf_info,
};
FRR_DAEMON_INFO(bfdd, BFD, .vty_port = 2617,
.proghelp = "Implementation of the BFD protocol.",
.signals = bfd_signals, .n_signals = array_size(bfd_signals),
.privs = &bglobal.bfdd_privs,
.yang_modules = bfdd_yang_modules,
.n_yang_modules = array_size(bfdd_yang_modules),
);
#define OPTION_CTLSOCK 1001
#define OPTION_DPLANEADDR 2000
static const struct option longopts[] = {
{"bfdctl", required_argument, NULL, OPTION_CTLSOCK},
{"dplaneaddr", required_argument, NULL, OPTION_DPLANEADDR},
{0}
};
/*
* BFD daemon related code.
*/
struct bfd_global bglobal;
const 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},
};
const 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 uint16_t
parse_port(const char *str)
{
char *nulbyte;
long rv;
errno = 0;
rv = strtol(str, &nulbyte, 10);
/* No conversion performed. */
if (rv == 0 && errno == EINVAL) {
fprintf(stderr, "invalid BFD data plane address port: %s\n",
str);
exit(0);
}
/* Invalid number range. */
if ((rv <= 0 || rv >= 65535) || errno == ERANGE) {
fprintf(stderr, "invalid BFD data plane port range: %s\n",
str);
exit(0);
}
/* There was garbage at the end of the string. */
if (*nulbyte != 0) {
fprintf(stderr, "invalid BFD data plane port: %s\n",
str);
exit(0);
}
return (uint16_t)rv;
}
static void
distributed_bfd_init(const char *arg)
{
char *sptr, *saux;
bool is_client = false;
size_t slen;
socklen_t salen;
char addr[64];
char type[64];
union {
struct sockaddr_in sin;
struct sockaddr_in6 sin6;
struct sockaddr_un sun;
} sa;
/* Basic parsing: find ':' to figure out type part and address part. */
sptr = strchr(arg, ':');
if (sptr == NULL) {
fprintf(stderr, "invalid BFD data plane socket: %s\n", arg);
exit(1);
}
/* Calculate type string length. */
slen = (size_t)(sptr - arg);
/* Copy the address part. */
sptr++;
strlcpy(addr, sptr, sizeof(addr));
/* Copy type part. */
strlcpy(type, arg, slen + 1);
/* Reset address data. */
memset(&sa, 0, sizeof(sa));
/* Fill the address information. */
if (strcmp(type, "unix") == 0 || strcmp(type, "unixc") == 0) {
if (strcmp(type, "unixc") == 0)
is_client = true;
salen = sizeof(sa.sun);
sa.sun.sun_family = AF_UNIX;
strlcpy(sa.sun.sun_path, addr, sizeof(sa.sun.sun_path));
} else if (strcmp(type, "ipv4") == 0 || strcmp(type, "ipv4c") == 0) {
if (strcmp(type, "ipv4c") == 0)
is_client = true;
salen = sizeof(sa.sin);
sa.sin.sin_family = AF_INET;
/* Parse port if any. */
sptr = strchr(addr, ':');
if (sptr == NULL) {
sa.sin.sin_port = htons(BFD_DATA_PLANE_DEFAULT_PORT);
} else {
*sptr = 0;
sa.sin.sin_port = htons(parse_port(sptr + 1));
}
if (inet_pton(AF_INET, addr, &sa.sin.sin_addr) != 1)
errx(1, "%s: inet_pton: invalid address %s", __func__,
addr);
} else if (strcmp(type, "ipv6") == 0 || strcmp(type, "ipv6c") == 0) {
if (strcmp(type, "ipv6c") == 0)
is_client = true;
salen = sizeof(sa.sin6);
sa.sin6.sin6_family = AF_INET6;
/* Check for IPv6 enclosures '[]' */
sptr = &addr[0];
if (*sptr != '[')
errx(1, "%s: invalid IPv6 address format: %s", __func__,
addr);
saux = strrchr(addr, ']');
if (saux == NULL)
errx(1, "%s: invalid IPv6 address format: %s", __func__,
addr);
/* Consume the '[]:' part. */
slen = saux - sptr;
memmove(addr, addr + 1, slen);
addr[slen - 1] = 0;
/* Parse port if any. */
saux++;
sptr = strrchr(saux, ':');
if (sptr == NULL) {
sa.sin6.sin6_port = htons(BFD_DATA_PLANE_DEFAULT_PORT);
} else {
*sptr = 0;
sa.sin6.sin6_port = htons(parse_port(sptr + 1));
}
if (inet_pton(AF_INET6, addr, &sa.sin6.sin6_addr) != 1)
errx(1, "%s: inet_pton: invalid address %s", __func__,
addr);
} else {
fprintf(stderr, "invalid BFD data plane socket type: %s\n",
type);
exit(1);
}
/* Initialize BFD data plane listening socket. */
bfd_dplane_init((struct sockaddr *)&sa, salen, is_client);
}
static void bg_init(void)
{
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,
};
TAILQ_INIT(&bglobal.bg_bcslist);
TAILQ_INIT(&bglobal.bg_obslist);
memcpy(&bglobal.bfdd_privs, &bfdd_privs,
sizeof(bfdd_privs));
}
int main(int argc, char *argv[])
{
char ctl_path[512], dplane_addr[512];
bool ctlsockused = false;
int opt;
/* Initialize system sockets. */
bg_init();
frr_preinit(&bfdd_di, argc, argv);
frr_opt_add("", longopts,
" --bfdctl Specify bfdd control socket\n"
" --dplaneaddr Specify BFD data plane address\n");
snprintf(ctl_path, sizeof(ctl_path), BFDD_CONTROL_SOCKET,
"", "");
while (true) {
opt = frr_getopt(argc, argv, NULL);
if (opt == EOF)
break;
switch (opt) {
case OPTION_CTLSOCK:
strlcpy(ctl_path, optarg, sizeof(ctl_path));
ctlsockused = true;
break;
case OPTION_DPLANEADDR:
strlcpy(dplane_addr, optarg, sizeof(dplane_addr));
bglobal.bg_use_dplane = true;
break;
default:
frr_help_exit(1);
}
}
if (bfdd_di.pathspace && !ctlsockused)
snprintf(ctl_path, sizeof(ctl_path), BFDD_CONTROL_SOCKET,
"/", bfdd_di.pathspace);
/* Initialize FRR infrastructure. */
master = frr_init();
/* Initialize control socket. */
control_init(ctl_path);
/* Initialize BFD data structures. */
bfd_initialize();
bfd_vrf_init();
access_list_init();
/* Initialize zebra connection. */
bfdd_zclient_init(&bglobal.bfdd_privs);
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();
/* Initialize BFD data plane listening socket. */
if (bglobal.bg_use_dplane)
distributed_bfd_init(dplane_addr);
frr_run(master);
/* NOTREACHED */
return 0;
}
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