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osmo-msc/openbsc/src/gprs/gtphub_vty.c

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/* (C) 2015 by sysmocom s.f.m.c. GmbH
* All Rights Reserved
*
* Author: Neels Hofmeyr
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License as published by
* the Free Software Foundation; either version 3 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 Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
*/
#include <string.h>
#include <inttypes.h>
#include <ares.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <osmocom/core/talloc.h>
#include <osmocom/vty/command.h>
#include <osmocom/vty/misc.h>
#include <openbsc/vty.h>
#include <openbsc/gtphub.h>
/* TODO split GRX ares from sgsn into a separate struct and allow use without
* globals. */
#include <openbsc/sgsn.h>
extern struct sgsn_instance *sgsn;
static struct gtphub *g_hub = 0;
static struct gtphub_cfg *g_cfg = 0;
static struct cmd_node gtphub_node = {
GTPHUB_NODE,
"%s(config-gtphub)# ",
1,
};
#define GTPH_DEFAULT_CONTROL_PORT 2123
#define GTPH_DEFAULT_USER_PORT 2152
static void write_addrs(struct vty *vty, const char *name,
struct gtphub_cfg_addr *c, struct gtphub_cfg_addr *u)
{
if ((c->port == GTPH_DEFAULT_CONTROL_PORT)
&& (u->port == GTPH_DEFAULT_USER_PORT)
&& (strcmp(c->addr_str, u->addr_str) == 0)) {
/* Default port numbers and same IP address: write "short"
* variant. */
vty_out(vty, " %s %s%s",
name,
c->addr_str,
VTY_NEWLINE);
return;
}
vty_out(vty, " %s ctrl %s %d user %s %d%s",
name,
c->addr_str, (int)c->port,
u->addr_str, (int)u->port,
VTY_NEWLINE);
struct ares_addr_node *server;
for (server = sgsn->ares_servers; server; server = server->next)
vty_out(vty, " grx-dns-add %s%s", inet_ntoa(server->addr.addr4), VTY_NEWLINE);
}
static int config_write_gtphub(struct vty *vty)
{
vty_out(vty, "gtphub%s", VTY_NEWLINE);
write_addrs(vty, "bind-to-sgsns",
&g_cfg->to_gsns[GTPH_SIDE_SGSN][GTPH_PLANE_CTRL].bind,
&g_cfg->to_gsns[GTPH_SIDE_SGSN][GTPH_PLANE_USER].bind);
write_addrs(vty, "bind-to-ggsns",
&g_cfg->to_gsns[GTPH_SIDE_GGSN][GTPH_PLANE_CTRL].bind,
&g_cfg->to_gsns[GTPH_SIDE_GGSN][GTPH_PLANE_USER].bind);
if (g_cfg->sgsn_use_sender) {
vty_out(vty, "sgsn-use-sender%s", VTY_NEWLINE);
}
if (g_cfg->proxy[GTPH_SIDE_SGSN][GTPH_PLANE_CTRL].addr_str) {
write_addrs(vty, "sgsn-proxy",
&g_cfg->proxy[GTPH_SIDE_SGSN][GTPH_PLANE_CTRL],
&g_cfg->proxy[GTPH_SIDE_SGSN][GTPH_PLANE_USER]);
}
if (g_cfg->proxy[GTPH_SIDE_GGSN][GTPH_PLANE_CTRL].addr_str) {
write_addrs(vty, "ggsn-proxy",
&g_cfg->proxy[GTPH_SIDE_GGSN][GTPH_PLANE_CTRL],
&g_cfg->proxy[GTPH_SIDE_GGSN][GTPH_PLANE_USER]);
}
return CMD_SUCCESS;
}
DEFUN(cfg_gtphub, cfg_gtphub_cmd,
"gtphub",
"Configure the GTP hub\n")
{
vty->node = GTPHUB_NODE;
return CMD_SUCCESS;
}
#define BIND_ARGS "ctrl ADDR <0-65535> user ADDR <0-65535>"
#define BIND_DOCS \
"Set GTP-C bind\n" \
"GTP-C local IP address (v4 or v6)\n" \
"GTP-C local port\n" \
"Set GTP-U bind\n" \
"GTP-U local IP address (v4 or v6)\n" \
"GTP-U local port\n"
DEFUN(cfg_gtphub_bind_to_sgsns_short, cfg_gtphub_bind_to_sgsns_short_cmd,
"bind-to-sgsns ADDR",
"GTP Hub Parameters\n"
"Set the local bind address to listen for SGSNs, for both GTP-C and GTP-U\n"
"Local IP address (v4 or v6)\n"
)
{
int i;
for_each_plane(i)
g_cfg->to_gsns[GTPH_SIDE_SGSN][i].bind.addr_str = talloc_strdup(tall_vty_ctx, argv[0]);
g_cfg->to_gsns[GTPH_SIDE_SGSN][GTPH_PLANE_CTRL].bind.port = GTPH_DEFAULT_CONTROL_PORT;
g_cfg->to_gsns[GTPH_SIDE_SGSN][GTPH_PLANE_USER].bind.port = GTPH_DEFAULT_USER_PORT;
return CMD_SUCCESS;
}
DEFUN(cfg_gtphub_bind_to_ggsns_short, cfg_gtphub_bind_to_ggsns_short_cmd,
"bind-to-ggsns ADDR",
"GTP Hub Parameters\n"
"Set the local bind address to listen for GGSNs, for both GTP-C and GTP-U\n"
"Local IP address (v4 or v6)\n"
)
{
int i;
for_each_plane(i)
g_cfg->to_gsns[GTPH_SIDE_GGSN][i].bind.addr_str = talloc_strdup(tall_vty_ctx, argv[0]);
g_cfg->to_gsns[GTPH_SIDE_GGSN][GTPH_PLANE_CTRL].bind.port = GTPH_DEFAULT_CONTROL_PORT;
g_cfg->to_gsns[GTPH_SIDE_GGSN][GTPH_PLANE_USER].bind.port = GTPH_DEFAULT_USER_PORT;
return CMD_SUCCESS;
}
static int handle_binds(struct gtphub_cfg_bind *b, const char **argv)
{
b[GTPH_PLANE_CTRL].bind.addr_str = talloc_strdup(tall_vty_ctx, argv[0]);
b[GTPH_PLANE_CTRL].bind.port = atoi(argv[1]);
b[GTPH_PLANE_USER].bind.addr_str = talloc_strdup(tall_vty_ctx, argv[2]);
b[GTPH_PLANE_USER].bind.port = atoi(argv[3]);
return CMD_SUCCESS;
}
DEFUN(cfg_gtphub_bind_to_sgsns, cfg_gtphub_bind_to_sgsns_cmd,
"bind-to-sgsns " BIND_ARGS,
"GTP Hub Parameters\n"
"Set the local bind addresses and ports to listen for SGSNs\n"
BIND_DOCS
)
{
return handle_binds(g_cfg->to_gsns[GTPH_SIDE_SGSN], argv);
}
DEFUN(cfg_gtphub_bind_to_ggsns, cfg_gtphub_bind_to_ggsns_cmd,
"bind-to-ggsns " BIND_ARGS,
"GTP Hub Parameters\n"
"Set the local bind addresses and ports to listen for GGSNs\n"
BIND_DOCS
)
{
return handle_binds(g_cfg->to_gsns[GTPH_SIDE_GGSN], argv);
}
DEFUN(cfg_gtphub_ggsn_proxy_short, cfg_gtphub_ggsn_proxy_short_cmd,
"ggsn-proxy ADDR",
"GTP Hub Parameters\n"
"Redirect all GGSN bound traffic to default ports on this address (another gtphub)\n"
"Remote IP address (v4 or v6)\n"
)
{
g_cfg->proxy[GTPH_SIDE_GGSN][GTPH_PLANE_CTRL].addr_str = talloc_strdup(tall_vty_ctx, argv[0]);
g_cfg->proxy[GTPH_SIDE_GGSN][GTPH_PLANE_CTRL].port = GTPH_DEFAULT_CONTROL_PORT;
g_cfg->proxy[GTPH_SIDE_GGSN][GTPH_PLANE_USER].addr_str = talloc_strdup(tall_vty_ctx, argv[0]);
g_cfg->proxy[GTPH_SIDE_GGSN][GTPH_PLANE_USER].port = GTPH_DEFAULT_USER_PORT;
return CMD_SUCCESS;
}
DEFUN(cfg_gtphub_ggsn_proxy, cfg_gtphub_ggsn_proxy_cmd,
"ggsn-proxy " BIND_ARGS,
"GTP Hub Parameters\n"
"Redirect all GGSN bound traffic to these addresses and ports (another gtphub)\n"
BIND_DOCS
)
{
g_cfg->proxy[GTPH_SIDE_GGSN][GTPH_PLANE_CTRL].addr_str = talloc_strdup(tall_vty_ctx, argv[0]);
g_cfg->proxy[GTPH_SIDE_GGSN][GTPH_PLANE_CTRL].port = atoi(argv[1]);
g_cfg->proxy[GTPH_SIDE_GGSN][GTPH_PLANE_USER].addr_str = talloc_strdup(tall_vty_ctx, argv[2]);
g_cfg->proxy[GTPH_SIDE_GGSN][GTPH_PLANE_USER].port = atoi(argv[3]);
return CMD_SUCCESS;
}
DEFUN(cfg_gtphub_sgsn_proxy_short, cfg_gtphub_sgsn_proxy_short_cmd,
"sgsn-proxy ADDR",
"GTP Hub Parameters\n"
"Redirect all SGSN bound traffic to default ports on this address (another gtphub)\n"
"Remote IP address (v4 or v6)\n"
)
{
g_cfg->proxy[GTPH_SIDE_SGSN][GTPH_PLANE_CTRL].addr_str = talloc_strdup(tall_vty_ctx, argv[0]);
g_cfg->proxy[GTPH_SIDE_SGSN][GTPH_PLANE_CTRL].port = GTPH_DEFAULT_CONTROL_PORT;
g_cfg->proxy[GTPH_SIDE_SGSN][GTPH_PLANE_USER].addr_str = talloc_strdup(tall_vty_ctx, argv[0]);
g_cfg->proxy[GTPH_SIDE_SGSN][GTPH_PLANE_USER].port = GTPH_DEFAULT_USER_PORT;
return CMD_SUCCESS;
}
DEFUN(cfg_gtphub_sgsn_proxy, cfg_gtphub_sgsn_proxy_cmd,
"sgsn-proxy " BIND_ARGS,
"GTP Hub Parameters\n"
"Redirect all SGSN bound traffic to these addresses and ports (another gtphub)\n"
BIND_DOCS
)
{
g_cfg->proxy[GTPH_SIDE_SGSN][GTPH_PLANE_CTRL].addr_str = talloc_strdup(tall_vty_ctx, argv[0]);
g_cfg->proxy[GTPH_SIDE_SGSN][GTPH_PLANE_CTRL].port = atoi(argv[1]);
g_cfg->proxy[GTPH_SIDE_SGSN][GTPH_PLANE_USER].addr_str = talloc_strdup(tall_vty_ctx, argv[2]);
g_cfg->proxy[GTPH_SIDE_SGSN][GTPH_PLANE_USER].port = atoi(argv[3]);
return CMD_SUCCESS;
}
#define SGSN_USE_SENDER_STR \
"Ignore SGSN's Address IEs, use sender address and port (useful over NAT)\n"
DEFUN(cfg_gtphub_sgsn_use_sender,
cfg_gtphub_sgsn_use_sender_cmd,
"sgsn-use-sender",
SGSN_USE_SENDER_STR)
{
g_cfg->sgsn_use_sender = 1;
return CMD_SUCCESS;
}
DEFUN(cfg_gtphub_no_sgsn_use_sender,
cfg_gtphub_no_sgsn_use_sender_cmd,
"no sgsn-use-sender",
NO_STR SGSN_USE_SENDER_STR)
{
g_cfg->sgsn_use_sender = 0;
return CMD_SUCCESS;
}
/* Copied from sgsn_vty.h */
DEFUN(cfg_grx_ggsn, cfg_grx_ggsn_cmd,
"grx-dns-add A.B.C.D",
"Add DNS server\nIPv4 address\n")
{
struct ares_addr_node *node = talloc_zero(tall_bsc_ctx, struct ares_addr_node);
node->family = AF_INET;
inet_aton(argv[0], &node->addr.addr4);
node->next = sgsn->ares_servers;
sgsn->ares_servers = node;
return CMD_SUCCESS;
}
static void show_bind_stats_all(struct vty *vty)
{
int plane_idx;
for_each_plane(plane_idx) {
vty_out(vty, "- %s Plane:%s",
gtphub_plane_idx_names[plane_idx], VTY_NEWLINE);
int side_idx;
for_each_side(side_idx) {
struct gtphub_bind *b = &g_hub->to_gsns[side_idx][plane_idx];
vty_out(vty, " - local addr to/from %ss: %s port %d%s",
gtphub_side_idx_names[side_idx],
gsn_addr_to_str(&b->local_addr), (int)b->local_port,
VTY_NEWLINE);
vty_out_rate_ctr_group(vty, " ", b->counters_io);
}
}
}
static void show_tunnel_stats(struct vty *vty, struct gtphub_tunnel *tun)
{
int plane_idx;
for_each_plane(plane_idx) {
vty_out(vty, "- %s Plane:%s",
gtphub_plane_idx_names[plane_idx], VTY_NEWLINE);
int side_idx;
for_each_side(side_idx) {
struct gtphub_tunnel_endpoint *te = &tun->endpoint[side_idx][plane_idx];
vty_out(vty, " - to/from %s:%s",
gtphub_side_idx_names[side_idx],
VTY_NEWLINE);
vty_out_rate_ctr_group(vty, " ", te->counters_io);
}
}
}
static void show_peer_summary(struct vty *vty, const char *prefix,
int side_idx, int plane_idx,
struct gtphub_peer *p, int with_io_stats)
{
struct gtphub_peer_addr *pa;
int p2l = strlen(prefix) + 4 + 1;
char prefix2[p2l];
memset(prefix2, ' ', p2l - 1);
prefix2[p2l - 1] = '\0';
if (with_io_stats) {
llist_for_each_entry(pa, &p->addresses, entry) {
vty_out(vty, "%s- %s %s %s%s", prefix,
gtphub_side_idx_names[side_idx],
gtphub_plane_idx_names[plane_idx],
gsn_addr_to_str(&pa->addr),
VTY_NEWLINE);
struct gtphub_peer_port *pp;
llist_for_each_entry(pp, &pa->ports, entry) {
vty_out(vty, "%s Port %" PRIu16 "%s", prefix, pp->port, VTY_NEWLINE);
vty_out_rate_ctr_group(vty, prefix2, pp->counters_io);
}
}
} else {
llist_for_each_entry(pa, &p->addresses, entry) {
vty_out(vty, "%s- %s %s %s", prefix,
gtphub_side_idx_names[side_idx],
gtphub_plane_idx_names[plane_idx],
gsn_addr_to_str(&pa->addr));
struct gtphub_peer_port *pp;
llist_for_each_entry(pp, &pa->ports, entry) {
vty_out(vty, ":%" PRIu16, pp->port);
}
vty_out(vty, VTY_NEWLINE);
}
}
}
static void show_peers_summary(struct vty *vty)
{
int side_idx;
int plane_idx;
int count[GTPH_SIDE_N][GTPH_PLANE_N] = {{0}};
for_each_side(side_idx) {
for_each_plane(plane_idx) {
struct gtphub_peer *p;
llist_for_each_entry(p, &g_hub->to_gsns[side_idx][plane_idx].peers, entry) {
count[side_idx][plane_idx] ++;
}
}
}
vty_out(vty, "Peers Count:%s", VTY_NEWLINE);
for_each_side_and_plane(side_idx, plane_idx) {
vty_out(vty, " %s %s peers: %d%s",
gtphub_side_idx_names[side_idx],
gtphub_plane_idx_names[plane_idx],
count[side_idx][plane_idx],
VTY_NEWLINE);
}
}
static void show_peers_all(struct vty *vty, int with_io_stats)
{
int side_idx;
int plane_idx;
int count[GTPH_SIDE_N][GTPH_PLANE_N] = {{0}};
vty_out(vty, "All Peers%s%s",
with_io_stats? " with I/O stats" : "",
VTY_NEWLINE);
for_each_side(side_idx) {
vty_out(vty, "- %s%s", gtphub_side_idx_names[side_idx], VTY_NEWLINE);
for_each_plane(plane_idx) {
struct gtphub_peer *p;
llist_for_each_entry(p, &g_hub->to_gsns[side_idx][plane_idx].peers, entry) {
count[side_idx][plane_idx] ++;
show_peer_summary(vty, " ", side_idx, plane_idx, p, with_io_stats);
}
}
}
for_each_side_and_plane(side_idx, plane_idx) {
vty_out(vty, "%s %s peers: %d%s",
gtphub_side_idx_names[side_idx],
gtphub_plane_idx_names[plane_idx],
count[side_idx][plane_idx],
VTY_NEWLINE);
}
}
static void show_tunnels_summary(struct vty *vty)
{
time_t now = gtphub_now();
const int w = 36;
int max_expiry = g_hub->expire_slowly.expiry_in_seconds;
float seconds_per_step = ((float)max_expiry) / w;
/* Print TEI mapping expiry in an ASCII histogram, like:
TEI map summary
Legend: '_'=0 '.'<=1% ':'<=2% '|'<=10% '#'>10% (10.0 m/step)
CTRL: 30 mappings, valid for 360m[# :. | . : . ]1m
USER: 30 mappings, valid for 360m[# :. | . : . ]1m
4 TEI mappings in total, last expiry in 359.4 min
*/
vty_out(vty,
"Tunnels summary%s"
" Legend: ' '=0 '.'<=1%% ':'<=2%% '|'<=10%% '#'>10%% (%.1f m/step)%s",
VTY_NEWLINE,
seconds_per_step / 60.,
VTY_NEWLINE);
int last_expiry = 0;
unsigned int count = 0;
int histogram[w];
memset(histogram, 0, sizeof(histogram));
struct gtphub_tunnel *t;
llist_for_each_entry(t, &g_hub->tunnels, entry) {
count ++;
int expiry = t->expiry_entry.expiry - now;
last_expiry = (last_expiry > expiry) ? last_expiry : expiry;
int hi = ((float)expiry) / seconds_per_step;
if (hi < 0)
hi = 0;
if (hi > (w - 1))
hi = w - 1;
histogram[hi] ++;
}
vty_out(vty,
" %u tunnels, valid for %dm[",
count, max_expiry / 60);
int i;
for (i = w - 1; i >= 0; i--) {
char c;
int val = histogram[i];
int percent = 100. * val / count;
if (!val)
c = ' ';
else if (percent <= 1)
c = '.';
else if (percent <= 2)
c = ':';
else if (percent <= 10)
c = '|';
else c = '#';
vty_out(vty, "%c", c);
}
vty_out(vty, "]1m%s", VTY_NEWLINE);
vty_out(vty, " last expiry in %.1f min%s",
((float)last_expiry) / 60.,
VTY_NEWLINE);
}
static void show_tunnels_all(struct vty *vty, int with_io_stats)
{
time_t now = gtphub_now();
vty_out(vty, "All tunnels%s:%s"
"Legend: TEI=<hex>: SGSN <-> GGSN (expiry in minutes), with each:%s"
" <IP-Ctrl>[/<IP-User>] (TEI C=<TEI-Ctrl-hex> U=<TEI-User-hex>)%s",
with_io_stats? "with I/O stats" : "",
VTY_NEWLINE, VTY_NEWLINE, VTY_NEWLINE);
unsigned int count = 0;
unsigned int incomplete = 0;
struct gtphub_tunnel *tun;
llist_for_each_entry(tun, &g_hub->tunnels, entry) {
vty_out(vty,
"%s (expiry in %dm)%s",
gtphub_tunnel_str(tun),
(int)((tun->expiry_entry.expiry - now) / 60),
VTY_NEWLINE);
count ++;
if (!gtphub_tunnel_complete(tun))
incomplete ++;
if (with_io_stats)
show_tunnel_stats(vty, tun);
}
vty_out(vty, "Total: %u tunnels (of which %u incomplete)%s",
count, incomplete, VTY_NEWLINE);
}
#define SHOW_GTPHUB_STRS SHOW_STR "Show info on running GTP hub\n"
#define SHOW_GTPHUB_PEERS_STRS SHOW_GTPHUB_STRS "Active peers\n"
#define SHOW_GTPHUB_TUNS_STRS SHOW_GTPHUB_STRS "Active tunnels\n"
DEFUN(show_gtphub_peers_summary, show_gtphub_peers_summary_cmd, "show gtphub peers summary",
SHOW_GTPHUB_PEERS_STRS "Summary of all peers\n")
{
show_peers_summary(vty);
return CMD_SUCCESS;
}
DEFUN(show_gtphub_peers_list, show_gtphub_peers_list_cmd, "show gtphub peers list",
SHOW_GTPHUB_PEERS_STRS "List all peers\n")
{
show_peers_all(vty, 0);
return CMD_SUCCESS;
}
DEFUN(show_gtphub_peers_stats, show_gtphub_peers_stats_cmd, "show gtphub peers stats",
SHOW_GTPHUB_PEERS_STRS "List all peers with I/O stats\n")
{
show_peers_all(vty, 1);
return CMD_SUCCESS;
}
DEFUN(show_gtphub_tunnels_summary, show_gtphub_tunnels_summary_cmd, "show gtphub tunnels summary",
SHOW_GTPHUB_TUNS_STRS "Summary of all tunnels\n")
{
show_tunnels_summary(vty);
return CMD_SUCCESS;
}
DEFUN(show_gtphub_tunnels_list, show_gtphub_tunnels_list_cmd, "show gtphub tunnels list",
SHOW_GTPHUB_TUNS_STRS "List all tunnels\n")
{
show_tunnels_all(vty, 0);
return CMD_SUCCESS;
}
DEFUN(show_gtphub_tunnels_stats, show_gtphub_tunnels_stats_cmd, "show gtphub tunnels stats",
SHOW_GTPHUB_TUNS_STRS "List all tunnels with I/O stats\n")
{
show_tunnels_all(vty, 1);
return CMD_SUCCESS;
}
DEFUN(show_gtphub, show_gtphub_cmd, "show gtphub all",
SHOW_GTPHUB_STRS "Summarize everything about the GTP hub\n")
{
show_bind_stats_all(vty);
show_peers_summary(vty);
show_tunnels_summary(vty);
return CMD_SUCCESS;
}
int gtphub_vty_init(struct gtphub *global_hub, struct gtphub_cfg *global_cfg)
{
g_hub = global_hub;
g_cfg = global_cfg;
install_element_ve(&show_gtphub_cmd);
install_element_ve(&show_gtphub_peers_summary_cmd);
install_element_ve(&show_gtphub_peers_list_cmd);
install_element_ve(&show_gtphub_peers_stats_cmd);
install_element_ve(&show_gtphub_tunnels_summary_cmd);
install_element_ve(&show_gtphub_tunnels_list_cmd);
install_element_ve(&show_gtphub_tunnels_stats_cmd);
install_element(CONFIG_NODE, &cfg_gtphub_cmd);
install_node(&gtphub_node, config_write_gtphub);
vty_install_default(GTPHUB_NODE);
install_element(GTPHUB_NODE, &cfg_gtphub_bind_to_sgsns_short_cmd);
install_element(GTPHUB_NODE, &cfg_gtphub_bind_to_sgsns_cmd);
install_element(GTPHUB_NODE, &cfg_gtphub_bind_to_ggsns_short_cmd);
install_element(GTPHUB_NODE, &cfg_gtphub_bind_to_ggsns_cmd);
install_element(GTPHUB_NODE, &cfg_gtphub_ggsn_proxy_short_cmd);
install_element(GTPHUB_NODE, &cfg_gtphub_ggsn_proxy_cmd);
install_element(GTPHUB_NODE, &cfg_gtphub_sgsn_proxy_short_cmd);
install_element(GTPHUB_NODE, &cfg_gtphub_sgsn_proxy_cmd);
install_element(GTPHUB_NODE, &cfg_gtphub_sgsn_use_sender_cmd);
install_element(GTPHUB_NODE, &cfg_gtphub_no_sgsn_use_sender_cmd);
install_element(GTPHUB_NODE, &cfg_grx_ggsn_cmd);
return 0;
}
int gtphub_cfg_read(struct gtphub_cfg *cfg, const char *config_file)
{
int rc;
rc = vty_read_config_file(config_file, NULL);
if (rc < 0) {
fprintf(stderr, "Failed to parse the config file: '%s'\n", config_file);
return rc;
}
return 0;
}
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