Harald Welte | 51b00a6 | 2014-04-03 09:37:38 -0400 | [diff] [blame] | 1 | /* Command line utility to create GTP link */ |
| 2 | |
| 3 | /* (C) 2014 by sysmocom - s.f.m.c. GmbH |
Pablo Neira Ayuso | 448bce4 | 2016-05-08 21:43:40 +0200 | [diff] [blame] | 4 | * (C) 2016 by Pablo Neira Ayuso <pablo@netfilter.org> |
| 5 | * |
Harald Welte | 51b00a6 | 2014-04-03 09:37:38 -0400 | [diff] [blame] | 6 | * Author: Pablo Neira Ayuso <pablo@gnumonks.org> |
| 7 | * |
| 8 | * All Rights Reserved |
| 9 | * |
| 10 | * This program is free software; you can redistribute it and/or modify |
| 11 | * it under the terms of the GNU General Public License as published by |
| 12 | * the Free Software Foundation; either version 2 of the License, or |
| 13 | * (at your option) any later version. |
| 14 | * |
| 15 | * This program is distributed in the hope that it will be useful, |
| 16 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 17 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 18 | * GNU Affero General Public License for more details. |
| 19 | * |
| 20 | * You should have received a copy of the GNU General Public License |
| 21 | * along with this program. If not, see <http://www.gnu.org/licenses/>. |
| 22 | * |
| 23 | */ |
| 24 | |
Pablo Neira Ayuso | 1450666 | 2014-02-20 18:43:15 +0100 | [diff] [blame] | 25 | #include <stdio.h> |
| 26 | #include <stdlib.h> |
| 27 | #include <unistd.h> |
| 28 | #include <string.h> |
| 29 | #include <time.h> |
Pablo Neira Ayuso | 50826a5 | 2016-05-10 18:00:51 +0200 | [diff] [blame] | 30 | #include <netinet/in.h> |
| 31 | #include <arpa/inet.h> |
Pablo Neira Ayuso | 1450666 | 2014-02-20 18:43:15 +0100 | [diff] [blame] | 32 | |
| 33 | #include <libmnl/libmnl.h> |
| 34 | #include <linux/if.h> |
| 35 | #include <linux/if_link.h> |
| 36 | #include <linux/rtnetlink.h> |
| 37 | |
Pablo Neira Ayuso | b9f6ffe | 2016-05-08 18:27:55 +0200 | [diff] [blame] | 38 | #include <linux/gtp.h> |
| 39 | #include <linux/if_link.h> |
Pablo Neira Ayuso | 1450666 | 2014-02-20 18:43:15 +0100 | [diff] [blame] | 40 | |
Pablo Neira Ayuso | 448bce4 | 2016-05-08 21:43:40 +0200 | [diff] [blame] | 41 | #include <libgtpnl/gtpnl.h> |
Pablo Neira Ayuso | d489488 | 2024-02-15 21:08:26 +0100 | [diff] [blame] | 42 | #include <errno.h> |
Pablo Neira Ayuso | 448bce4 | 2016-05-08 21:43:40 +0200 | [diff] [blame] | 43 | |
Pablo Neira Ayuso | 38b5e23 | 2023-11-03 17:58:43 +0100 | [diff] [blame] | 44 | struct gtp_server_sock { |
| 45 | int family; |
| 46 | int fd1; |
| 47 | int fd2; |
| 48 | socklen_t len; |
| 49 | struct { |
| 50 | union { |
| 51 | struct sockaddr_in in; |
| 52 | struct sockaddr_in6 in6; |
| 53 | } fd1; |
| 54 | union { |
| 55 | struct sockaddr_in in; |
| 56 | struct sockaddr_in6 in6; |
| 57 | } fd2; |
| 58 | } sockaddr; |
Pablo Neira Ayuso | d489488 | 2024-02-15 21:08:26 +0100 | [diff] [blame] | 59 | union { |
| 60 | struct in_addr v4; |
| 61 | struct in6_addr v6; |
| 62 | } addr; |
Pablo Neira Ayuso | 38b5e23 | 2023-11-03 17:58:43 +0100 | [diff] [blame] | 63 | }; |
| 64 | |
Pablo Neira Ayuso | d489488 | 2024-02-15 21:08:26 +0100 | [diff] [blame] | 65 | static void setup_sockaddr_in(struct sockaddr_in *sockaddr, struct in_addr *in, |
| 66 | uint16_t port) |
Pablo Neira Ayuso | 38b5e23 | 2023-11-03 17:58:43 +0100 | [diff] [blame] | 67 | { |
| 68 | sockaddr->sin_family = AF_INET; |
| 69 | sockaddr->sin_port = htons(port); |
Pablo Neira Ayuso | d489488 | 2024-02-15 21:08:26 +0100 | [diff] [blame] | 70 | sockaddr->sin_addr = *in; |
Pablo Neira Ayuso | 38b5e23 | 2023-11-03 17:58:43 +0100 | [diff] [blame] | 71 | } |
| 72 | |
Pablo Neira Ayuso | d489488 | 2024-02-15 21:08:26 +0100 | [diff] [blame] | 73 | static void setup_sockaddr_in6(struct sockaddr_in6 *sockaddr, struct in6_addr *in6, |
| 74 | uint16_t port) |
Pablo Neira Ayuso | 38b5e23 | 2023-11-03 17:58:43 +0100 | [diff] [blame] | 75 | { |
| 76 | sockaddr->sin6_family = AF_INET6; |
| 77 | sockaddr->sin6_port = htons(port); |
Pablo Neira Ayuso | d489488 | 2024-02-15 21:08:26 +0100 | [diff] [blame] | 78 | sockaddr->sin6_addr = *in6; |
Pablo Neira Ayuso | 38b5e23 | 2023-11-03 17:58:43 +0100 | [diff] [blame] | 79 | } |
| 80 | |
| 81 | static int setup_socket(struct gtp_server_sock *gtp_sock, int family) |
| 82 | { |
Pablo Neira Ayuso | 9911f6b | 2024-01-31 18:17:51 +0100 | [diff] [blame] | 83 | int one = 1; |
Pablo Neira Ayuso | 38b5e23 | 2023-11-03 17:58:43 +0100 | [diff] [blame] | 84 | |
Oliver Smith | 7928152 | 2024-02-19 12:15:40 +0100 | [diff] [blame^] | 85 | gtp_sock->fd1 = socket(family, SOCK_DGRAM, 0); |
| 86 | gtp_sock->fd2 = socket(family, SOCK_DGRAM, 0); |
| 87 | |
| 88 | if (gtp_sock->fd1 < 0 || gtp_sock->fd2 < 0) |
Pablo Neira Ayuso | 38b5e23 | 2023-11-03 17:58:43 +0100 | [diff] [blame] | 89 | return -1; |
| 90 | |
Pablo Neira Ayuso | 38b5e23 | 2023-11-03 17:58:43 +0100 | [diff] [blame] | 91 | gtp_sock->family = family; |
Pablo Neira Ayuso | 38b5e23 | 2023-11-03 17:58:43 +0100 | [diff] [blame] | 92 | |
| 93 | switch (family) { |
| 94 | case AF_INET: |
| 95 | gtp_sock->len = sizeof(struct sockaddr_in); |
Pablo Neira Ayuso | d489488 | 2024-02-15 21:08:26 +0100 | [diff] [blame] | 96 | setup_sockaddr_in(>p_sock->sockaddr.fd1.in, |
| 97 | >p_sock->addr.v4, 3386); |
| 98 | setup_sockaddr_in(>p_sock->sockaddr.fd2.in, |
| 99 | >p_sock->addr.v4, 2152); |
Pablo Neira Ayuso | 38b5e23 | 2023-11-03 17:58:43 +0100 | [diff] [blame] | 100 | break; |
| 101 | case AF_INET6: |
| 102 | gtp_sock->len = sizeof(struct sockaddr_in6); |
Pablo Neira Ayuso | d489488 | 2024-02-15 21:08:26 +0100 | [diff] [blame] | 103 | setup_sockaddr_in6(>p_sock->sockaddr.fd1.in6, |
| 104 | >p_sock->addr.v6, 3386); |
| 105 | setup_sockaddr_in6(>p_sock->sockaddr.fd2.in6, |
| 106 | >p_sock->addr.v6, 2152); |
Oliver Smith | 7928152 | 2024-02-19 12:15:40 +0100 | [diff] [blame^] | 107 | if (setsockopt(gtp_sock->fd1, IPPROTO_IPV6, IPV6_V6ONLY, &one, sizeof(one)) < 0) |
Pablo Neira Ayuso | 9911f6b | 2024-01-31 18:17:51 +0100 | [diff] [blame] | 108 | perror("setsockopt IPV6_V6ONLY: "); |
Oliver Smith | 7928152 | 2024-02-19 12:15:40 +0100 | [diff] [blame^] | 109 | if (setsockopt(gtp_sock->fd2, IPPROTO_IPV6, IPV6_V6ONLY, &one, sizeof(one)) < 0) |
Pablo Neira Ayuso | 9911f6b | 2024-01-31 18:17:51 +0100 | [diff] [blame] | 110 | perror("setsockopt IPV6_V6ONLY: "); |
Pablo Neira Ayuso | 38b5e23 | 2023-11-03 17:58:43 +0100 | [diff] [blame] | 111 | break; |
| 112 | } |
| 113 | |
| 114 | return 0; |
| 115 | } |
| 116 | |
Oliver Smith | 7928152 | 2024-02-19 12:15:40 +0100 | [diff] [blame^] | 117 | static void close_socket(struct gtp_server_sock *gtp_sock) |
| 118 | { |
| 119 | if (gtp_sock->fd1 != -1) { |
| 120 | close(gtp_sock->fd1); |
| 121 | gtp_sock->fd1 = -1; |
| 122 | } |
| 123 | |
| 124 | if (gtp_sock->fd2 != -1) { |
| 125 | close(gtp_sock->fd2); |
| 126 | gtp_sock->fd2 = -1; |
| 127 | } |
| 128 | } |
| 129 | |
Pablo Neira Ayuso | 1450666 | 2014-02-20 18:43:15 +0100 | [diff] [blame] | 130 | int main(int argc, char *argv[]) |
| 131 | { |
Pablo Neira Ayuso | 1450666 | 2014-02-20 18:43:15 +0100 | [diff] [blame] | 132 | char buf[MNL_SOCKET_BUFFER_SIZE]; |
Pablo Neira Ayuso | 38b5e23 | 2023-11-03 17:58:43 +0100 | [diff] [blame] | 133 | struct gtp_server_sock gtp_sock; |
| 134 | int ret, sgsn_mode = 0, family; |
Pablo Neira Ayuso | d489488 | 2024-02-15 21:08:26 +0100 | [diff] [blame] | 135 | const char *addr = NULL; |
| 136 | |
| 137 | memset(>p_sock, 0, sizeof(gtp_sock)); |
Pablo Neira Ayuso | 1450666 | 2014-02-20 18:43:15 +0100 | [diff] [blame] | 138 | |
Harald Welte | 3bf55c3 | 2017-03-15 18:03:42 +0100 | [diff] [blame] | 139 | if (argc < 3) { |
Pablo Neira Ayuso | d489488 | 2024-02-15 21:08:26 +0100 | [diff] [blame] | 140 | printf("Usage: %s add <device> <family> [--sgsn] [<address>]\n", argv[0]); |
Oliver Smith | 6954da7 | 2022-09-07 15:48:16 +0200 | [diff] [blame] | 141 | printf(" %s del <device>\n", argv[0]); |
Pablo Neira Ayuso | 1450666 | 2014-02-20 18:43:15 +0100 | [diff] [blame] | 142 | exit(EXIT_FAILURE); |
| 143 | } |
| 144 | |
Pablo Neira Ayuso | 448bce4 | 2016-05-08 21:43:40 +0200 | [diff] [blame] | 145 | if (!strcmp(argv[1], "del")) { |
| 146 | printf("destroying gtp interface...\n"); |
| 147 | if (gtp_dev_destroy(argv[2]) < 0) |
| 148 | perror("gtp_dev_destroy"); |
| 149 | |
| 150 | return 0; |
Pablo Neira Ayuso | 38b5e23 | 2023-11-03 17:58:43 +0100 | [diff] [blame] | 151 | } else if (!strcmp(argv[1], "add")) { |
| 152 | if (argc < 4) { |
Pablo Neira Ayuso | d489488 | 2024-02-15 21:08:26 +0100 | [diff] [blame] | 153 | printf("Usage: %s add <device> <family> [--sgsn] [<address>]\n", argv[0]); |
Pablo Neira Ayuso | 38b5e23 | 2023-11-03 17:58:43 +0100 | [diff] [blame] | 154 | exit(EXIT_FAILURE); |
| 155 | } |
| 156 | |
Pablo Neira Ayuso | d489488 | 2024-02-15 21:08:26 +0100 | [diff] [blame] | 157 | if (argc == 5) { |
| 158 | if (!strcmp(argv[4], "--sgsn")) |
| 159 | sgsn_mode = 1; |
| 160 | else |
| 161 | addr = argv[4]; |
| 162 | } |
| 163 | |
| 164 | if (argc == 6) { |
| 165 | if (!strcmp(argv[4], "--sgsn")) |
| 166 | sgsn_mode = 1; |
| 167 | |
| 168 | addr = argv[5]; |
| 169 | } |
Pablo Neira Ayuso | 448bce4 | 2016-05-08 21:43:40 +0200 | [diff] [blame] | 170 | } |
| 171 | |
Pablo Neira Ayuso | 38b5e23 | 2023-11-03 17:58:43 +0100 | [diff] [blame] | 172 | if (!strcmp(argv[3], "ip")) |
| 173 | family = AF_INET; |
| 174 | else if (!strcmp(argv[3], "ip6")) |
| 175 | family = AF_INET6; |
| 176 | else { |
| 177 | fprintf(stderr, "unsupport family `%s', expecting `ip' or `ip6'\n", |
| 178 | argv[3]); |
| 179 | exit(EXIT_FAILURE); |
| 180 | } |
Harald Welte | 3bf55c3 | 2017-03-15 18:03:42 +0100 | [diff] [blame] | 181 | |
Pablo Neira Ayuso | d489488 | 2024-02-15 21:08:26 +0100 | [diff] [blame] | 182 | if (addr) { |
| 183 | if (!inet_pton(family, addr, >p_sock.addr)) { |
| 184 | fprintf(stderr, "invalid listener address: %s\n", |
| 185 | strerror(errno)); |
| 186 | exit(EXIT_FAILURE); |
| 187 | } |
| 188 | } else { |
| 189 | switch (family) { |
| 190 | case AF_INET: |
| 191 | gtp_sock.addr.v4.s_addr = INADDR_ANY; |
| 192 | break; |
| 193 | case AF_INET6: |
| 194 | gtp_sock.addr.v6 = in6addr_any; |
| 195 | break; |
| 196 | } |
| 197 | } |
| 198 | |
Pablo Neira Ayuso | 38b5e23 | 2023-11-03 17:58:43 +0100 | [diff] [blame] | 199 | if (setup_socket(>p_sock, family) < 0) { |
| 200 | perror("socket"); |
Oliver Smith | 7928152 | 2024-02-19 12:15:40 +0100 | [diff] [blame^] | 201 | close_socket(>p_sock); |
Pablo Neira Ayuso | 38b5e23 | 2023-11-03 17:58:43 +0100 | [diff] [blame] | 202 | exit(EXIT_FAILURE); |
| 203 | } |
Pablo Neira Ayuso | 50826a5 | 2016-05-10 18:00:51 +0200 | [diff] [blame] | 204 | |
Pablo Neira Ayuso | 38b5e23 | 2023-11-03 17:58:43 +0100 | [diff] [blame] | 205 | if (bind(gtp_sock.fd1, (struct sockaddr *) >p_sock.sockaddr.fd1, gtp_sock.len) < 0) { |
Pablo Neira Ayuso | 50826a5 | 2016-05-10 18:00:51 +0200 | [diff] [blame] | 206 | perror("bind"); |
Oliver Smith | 7928152 | 2024-02-19 12:15:40 +0100 | [diff] [blame^] | 207 | close_socket(>p_sock); |
Pablo Neira Ayuso | 50826a5 | 2016-05-10 18:00:51 +0200 | [diff] [blame] | 208 | exit(EXIT_FAILURE); |
| 209 | } |
Pablo Neira Ayuso | 38b5e23 | 2023-11-03 17:58:43 +0100 | [diff] [blame] | 210 | if (bind(gtp_sock.fd2, (struct sockaddr *) >p_sock.sockaddr.fd2, gtp_sock.len) < 0) { |
Pablo Neira Ayuso | 50826a5 | 2016-05-10 18:00:51 +0200 | [diff] [blame] | 211 | perror("bind"); |
Oliver Smith | 7928152 | 2024-02-19 12:15:40 +0100 | [diff] [blame^] | 212 | close_socket(>p_sock); |
Pablo Neira Ayuso | 50826a5 | 2016-05-10 18:00:51 +0200 | [diff] [blame] | 213 | exit(EXIT_FAILURE); |
| 214 | } |
Pablo Neira Ayuso | 7aa2087 | 2014-02-24 11:38:52 +0100 | [diff] [blame] | 215 | |
Harald Welte | 3bf55c3 | 2017-03-15 18:03:42 +0100 | [diff] [blame] | 216 | if (sgsn_mode) |
Pablo Neira Ayuso | 38b5e23 | 2023-11-03 17:58:43 +0100 | [diff] [blame] | 217 | ret = gtp_dev_create_sgsn(-1, argv[2], gtp_sock.fd1, gtp_sock.fd2); |
Harald Welte | 3bf55c3 | 2017-03-15 18:03:42 +0100 | [diff] [blame] | 218 | else |
Pablo Neira Ayuso | 38b5e23 | 2023-11-03 17:58:43 +0100 | [diff] [blame] | 219 | ret = gtp_dev_create(-1, argv[2], gtp_sock.fd1, gtp_sock.fd2); |
Harald Welte | a7a4df3 | 2017-03-15 20:53:08 +0100 | [diff] [blame] | 220 | if (ret < 0) { |
| 221 | perror("cannot create GTP device\n"); |
Oliver Smith | 7928152 | 2024-02-19 12:15:40 +0100 | [diff] [blame^] | 222 | close_socket(>p_sock); |
Pablo Neira Ayuso | 1450666 | 2014-02-20 18:43:15 +0100 | [diff] [blame] | 223 | exit(EXIT_FAILURE); |
| 224 | } |
| 225 | |
Pablo Neira Ayuso | 448bce4 | 2016-05-08 21:43:40 +0200 | [diff] [blame] | 226 | fprintf(stderr, "WARNING: attaching dummy socket descriptors. Keep " |
| 227 | "this process running for testing purposes.\n"); |
Pablo Neira Ayuso | 50826a5 | 2016-05-10 18:00:51 +0200 | [diff] [blame] | 228 | |
| 229 | while (1) { |
Pablo Neira Ayuso | 38b5e23 | 2023-11-03 17:58:43 +0100 | [diff] [blame] | 230 | union { |
| 231 | struct sockaddr_in addr; |
| 232 | struct sockaddr_in6 addr6; |
| 233 | } sock; |
Pablo Neira Ayuso | 50826a5 | 2016-05-10 18:00:51 +0200 | [diff] [blame] | 234 | |
Pablo Neira Ayuso | 38b5e23 | 2023-11-03 17:58:43 +0100 | [diff] [blame] | 235 | ret = recvfrom(gtp_sock.fd1, buf, sizeof(buf), 0, |
| 236 | (struct sockaddr *)&sock, >p_sock.len); |
Pablo Neira Ayuso | 50826a5 | 2016-05-10 18:00:51 +0200 | [diff] [blame] | 237 | printf("received %d bytes via UDP socket\n", ret); |
| 238 | } |
Pablo Neira Ayuso | 448bce4 | 2016-05-08 21:43:40 +0200 | [diff] [blame] | 239 | |
Pablo Neira Ayuso | 1450666 | 2014-02-20 18:43:15 +0100 | [diff] [blame] | 240 | return 0; |
| 241 | } |