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/* Command line utility to create GTP tunnels (PDP contexts) */
/* (C) 2014 by sysmocom - s.f.m.c. GmbH
* (C) 2016 by Pablo Neira Ayuso <pablo@netfilter.org>
*
* Author: Pablo Neira Ayuso <pablo@gnumonks.org>
*
* All Rights Reserved
*
* 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 Affero General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <time.h>
#include <arpa/inet.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <net/if.h>
#include <inttypes.h>
#include <libmnl/libmnl.h>
#include <linux/genetlink.h>
#include <linux/gtp.h>
#include <linux/if_link.h>
#include <libgtpnl/gtp.h>
#include <libgtpnl/gtpnl.h>
static void add_usage(const char *name)
{
printf("%s add <gtp device> <v0> <tid> <ms-addr> <sgsn-addr>\n",
name);
printf("%s add <gtp device> <v1> <i_tei> <o_tei> <ms-addr> <sgsn-addr>\n",
name);
}
static void set_addr(const char *addr, bool is_ms, struct gtp_tunnel *t)
{
struct in_addr ip4;
struct in6_addr ip6;
if (inet_pton(AF_INET, addr, &ip4) == 1) {
if (is_ms)
return gtp_tunnel_set_ms_ip4(t, &ip4);
return gtp_tunnel_set_sgsn_ip4(t, &ip4);
}
if (inet_pton(AF_INET6, addr, &ip6) == 1) {
if (is_ms)
return gtp_tunnel_set_ms_ip6(t, &ip6);
return gtp_tunnel_set_sgsn_ip6(t, &ip6);
}
fprintf(stderr, "bad address: %s\n", addr);
exit(EXIT_FAILURE);
}
static int
add_tunnel(int argc, char *argv[], int genl_id, struct mnl_socket *nl)
{
struct gtp_tunnel *t;
uint32_t gtp_ifidx;
uint32_t gtp_version;
int optidx;
int ret;
if (argc < 7 || argc > 8) {
add_usage(argv[0]);
return EXIT_FAILURE;
}
t = gtp_tunnel_alloc();
optidx = 2;
gtp_ifidx = if_nametoindex(argv[optidx]);
if (gtp_ifidx == 0) {
fprintf(stderr, "wrong GTP interface %s\n", argv[optidx]);
return EXIT_FAILURE;
}
gtp_tunnel_set_ifidx(t, gtp_ifidx);
optidx++;
if (strcmp(argv[optidx], "v0") == 0)
gtp_version = GTP_V0;
else if (strcmp(argv[optidx], "v1") == 0)
gtp_version = GTP_V1;
else {
fprintf(stderr, "wrong GTP version %s, use v0 or v1\n",
argv[optidx]);
return EXIT_FAILURE;
}
gtp_tunnel_set_version(t, gtp_version);
optidx++;
if (gtp_version == GTP_V0) {
gtp_tunnel_set_tid(t, atoi(argv[optidx++]));
gtp_tunnel_set_flowid(t, 0);
} else if (gtp_version == GTP_V1) {
gtp_tunnel_set_i_tei(t, atoi(argv[optidx++]));
gtp_tunnel_set_o_tei(t, atoi(argv[optidx++]));
}
set_addr(argv[optidx++], true, t);
set_addr(argv[optidx++], false, t);
ret = gtp_add_tunnel(genl_id, nl, t);
gtp_tunnel_free(t);
return ret;
}
static int
del_tunnel(int argc, char *argv[], int genl_id, struct mnl_socket *nl)
{
struct gtp_tunnel *t;
uint32_t gtp_ifidx;
int ret;
if (argc != 6) {
printf("%s del <gtp device> <version> <tid|i_tei> <family>\n",
argv[0]);
return EXIT_FAILURE;
}
t = gtp_tunnel_alloc();
gtp_ifidx = if_nametoindex(argv[2]);
if (gtp_ifidx == 0) {
fprintf(stderr, "wrong GTP interface %s\n", argv[2]);
gtp_tunnel_free(t);
return EXIT_FAILURE;
}
gtp_tunnel_set_ifidx(t, gtp_ifidx);
if (strcmp(argv[3], "v0") == 0) {
gtp_tunnel_set_version(t, GTP_V0);
gtp_tunnel_set_tid(t, atoi(argv[4]));
} else if (strcmp(argv[3], "v1") == 0) {
gtp_tunnel_set_version(t, GTP_V1);
gtp_tunnel_set_i_tei(t, atoi(argv[4]));
} else {
fprintf(stderr, "wrong GTP version %s, use v0 or v1\n",
argv[3]);
gtp_tunnel_free(t);
return EXIT_FAILURE;
}
if (strcmp(argv[5], "ip") == 0) {
gtp_tunnel_set_family(t, AF_INET);
} else if (strcmp(argv[5], "ip6") == 0) {
gtp_tunnel_set_family(t, AF_INET6);
} else {
fprintf(stderr, "wrong family %s, use ip or ip6\n", argv[5]);
gtp_tunnel_free(t);
return EXIT_FAILURE;
}
ret = gtp_del_tunnel(genl_id, nl, t);
gtp_tunnel_free(t);
return ret;
}
struct gtp_pdp {
uint32_t version;
union {
struct {
uint64_t tid;
} v0;
struct {
uint32_t i_tei;
uint32_t o_tei;
} v1;
} u;
struct in_addr sgsn_addr;
struct in_addr ms_addr;
};
static int
list_tunnel(int argc, char *argv[], int genl_id, struct mnl_socket *nl)
{
return gtp_list_tunnel(genl_id, nl);
}
int main(int argc, char *argv[])
{
struct mnl_socket *nl;
int32_t genl_id;
int ret;
if (argc < 2) {
printf("%s <add|delete|list> [<options,...>]\n", argv[0]);
exit(EXIT_FAILURE);
}
nl = genl_socket_open();
if (nl == NULL) {
perror("mnl_socket_open");
exit(EXIT_FAILURE);
}
genl_id = genl_lookup_family(nl, "gtp");
if (genl_id < 0) {
printf("not found gtp genl family\n");
exit(EXIT_FAILURE);
}
if (strncmp(argv[1], "add", strlen(argv[1])) == 0)
ret = add_tunnel(argc, argv, genl_id, nl);
else if (strncmp(argv[1], "delete", strlen(argv[1])) == 0)
ret = del_tunnel(argc, argv, genl_id, nl);
else if (strncmp(argv[1], "list", strlen(argv[1])) == 0)
ret = list_tunnel(argc, argv, genl_id, nl);
else {
printf("Unknown command `%s'\n", argv[1]);
exit(EXIT_FAILURE);
}
mnl_socket_close(nl);
return ret;
}
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