Holger Hans Peter Freyther | 9e2c5f5 | 2010-06-15 18:44:42 +0800 | [diff] [blame] | 1 | /* BSC Multiplexer/NAT */ |
| 2 | |
| 3 | /* |
| 4 | * (C) 2010 by Holger Hans Peter Freyther <zecke@selfish.org> |
Holger Hans Peter Freyther | df6143a | 2010-06-15 18:46:56 +0800 | [diff] [blame] | 5 | * (C) 2010 by On-Waves |
Holger Hans Peter Freyther | 49d8068 | 2010-01-12 21:34:54 +0100 | [diff] [blame] | 6 | * (C) 2009 by Harald Welte <laforge@gnumonks.org> |
Holger Hans Peter Freyther | 9e2c5f5 | 2010-06-15 18:44:42 +0800 | [diff] [blame] | 7 | * All Rights Reserved |
| 8 | * |
| 9 | * This program is free software; you can redistribute it and/or modify |
| 10 | * it under the terms of the GNU General Public License as published by |
| 11 | * the Free Software Foundation; either version 2 of the License, or |
| 12 | * (at your option) any later version. |
| 13 | * |
| 14 | * This program is distributed in the hope that it will be useful, |
| 15 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 16 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 17 | * GNU General Public License for more details. |
| 18 | * |
| 19 | * You should have received a copy of the GNU General Public License along |
| 20 | * with this program; if not, write to the Free Software Foundation, Inc., |
| 21 | * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. |
| 22 | * |
| 23 | */ |
| 24 | #include <sys/socket.h> |
| 25 | #include <netinet/in.h> |
Holger Hans Peter Freyther | 9e938c6 | 2010-05-05 18:58:13 +0800 | [diff] [blame] | 26 | #include <netinet/tcp.h> |
Holger Hans Peter Freyther | 9e2c5f5 | 2010-06-15 18:44:42 +0800 | [diff] [blame] | 27 | #include <arpa/inet.h> |
| 28 | |
Holger Hans Peter Freyther | 49d8068 | 2010-01-12 21:34:54 +0100 | [diff] [blame] | 29 | #include <errno.h> |
Holger Hans Peter Freyther | 6ace522 | 2010-01-12 21:15:08 +0100 | [diff] [blame] | 30 | #include <signal.h> |
Holger Hans Peter Freyther | 9e2c5f5 | 2010-06-15 18:44:42 +0800 | [diff] [blame] | 31 | #include <stdio.h> |
| 32 | #include <stdlib.h> |
Holger Hans Peter Freyther | 5aa25ae | 2010-01-12 21:36:08 +0100 | [diff] [blame] | 33 | #include <time.h> |
Holger Hans Peter Freyther | 9e2c5f5 | 2010-06-15 18:44:42 +0800 | [diff] [blame] | 34 | #include <unistd.h> |
| 35 | |
| 36 | #define _GNU_SOURCE |
| 37 | #include <getopt.h> |
| 38 | |
| 39 | #include <openbsc/debug.h> |
Holger Hans Peter Freyther | 6ace522 | 2010-01-12 21:15:08 +0100 | [diff] [blame] | 40 | #include <openbsc/bsc_msc.h> |
Holger Hans Peter Freyther | 6a97b8d | 2010-06-15 18:45:26 +0800 | [diff] [blame] | 41 | #include <openbsc/bsc_nat.h> |
Holger Hans Peter Freyther | 38a77d0 | 2010-01-30 12:45:10 +0100 | [diff] [blame] | 42 | #include <openbsc/bssap.h> |
Holger Hans Peter Freyther | 6ace522 | 2010-01-12 21:15:08 +0100 | [diff] [blame] | 43 | #include <openbsc/ipaccess.h> |
| 44 | #include <openbsc/abis_nm.h> |
Holger Hans Peter Freyther | 9a85ef3 | 2010-06-15 18:46:11 +0800 | [diff] [blame] | 45 | #include <openbsc/telnet_interface.h> |
| 46 | |
Holger Hans Peter Freyther | 6c45f2e | 2010-06-15 19:06:18 +0800 | [diff] [blame] | 47 | #include <osmocore/talloc.h> |
| 48 | |
Holger Hans Peter Freyther | 9a85ef3 | 2010-06-15 18:46:11 +0800 | [diff] [blame] | 49 | #include <vty/vty.h> |
Holger Hans Peter Freyther | 9e2c5f5 | 2010-06-15 18:44:42 +0800 | [diff] [blame] | 50 | |
Holger Hans Peter Freyther | 6a97b8d | 2010-06-15 18:45:26 +0800 | [diff] [blame] | 51 | #include <sccp/sccp.h> |
| 52 | |
Holger Hans Peter Freyther | fb7a934 | 2010-06-15 19:14:12 +0800 | [diff] [blame] | 53 | struct log_target *stderr_target; |
Holger Hans Peter Freyther | 9a85ef3 | 2010-06-15 18:46:11 +0800 | [diff] [blame] | 54 | static const char *config_file = "bsc-nat.cfg"; |
Holger Hans Peter Freyther | 9e2c5f5 | 2010-06-15 18:44:42 +0800 | [diff] [blame] | 55 | static struct in_addr local_addr; |
Holger Hans Peter Freyther | baf2abe | 2010-06-15 18:47:29 +0800 | [diff] [blame] | 56 | static struct bsc_msc_connection *msc_con; |
Holger Hans Peter Freyther | 2d677c6 | 2010-03-26 06:51:04 +0100 | [diff] [blame] | 57 | static struct bsc_fd bsc_listen; |
Holger Hans Peter Freyther | a88742c | 2010-06-15 18:51:04 +0800 | [diff] [blame] | 58 | static const char *msc_ip = NULL; |
Holger Hans Peter Freyther | 6ace522 | 2010-01-12 21:15:08 +0100 | [diff] [blame] | 59 | |
Holger Hans Peter Freyther | 24614ad | 2010-01-13 09:28:12 +0100 | [diff] [blame] | 60 | |
Holger Hans Peter Freyther | 9a85ef3 | 2010-06-15 18:46:11 +0800 | [diff] [blame] | 61 | static struct bsc_nat *nat; |
Holger Hans Peter Freyther | 2896df7 | 2010-04-08 10:24:57 +0200 | [diff] [blame] | 62 | static void bsc_send_data(struct bsc_connection *bsc, const u_int8_t *data, unsigned int length, int); |
Holger Hans Peter Freyther | b752761 | 2010-04-07 11:20:36 +0200 | [diff] [blame] | 63 | static void msc_send_reset(struct bsc_msc_connection *con); |
Holger Hans Peter Freyther | 9a85ef3 | 2010-06-15 18:46:11 +0800 | [diff] [blame] | 64 | |
Holger Hans Peter Freyther | 9a85ef3 | 2010-06-15 18:46:11 +0800 | [diff] [blame] | 65 | struct bsc_config *bsc_config_num(struct bsc_nat *nat, int num) |
| 66 | { |
| 67 | struct bsc_config *conf; |
| 68 | |
| 69 | llist_for_each_entry(conf, &nat->bsc_configs, entry) |
| 70 | if (conf->nr == num) |
| 71 | return conf; |
| 72 | |
| 73 | return NULL; |
| 74 | } |
Holger Hans Peter Freyther | 24614ad | 2010-01-13 09:28:12 +0100 | [diff] [blame] | 75 | |
Holger Hans Peter Freyther | 6ace522 | 2010-01-12 21:15:08 +0100 | [diff] [blame] | 76 | /* |
| 77 | * below are stubs we need to link |
| 78 | */ |
| 79 | int nm_state_event(enum nm_evt evt, u_int8_t obj_class, void *obj, |
| 80 | struct gsm_nm_state *old_state, struct gsm_nm_state *new_state) |
| 81 | { |
| 82 | return -1; |
| 83 | } |
| 84 | |
| 85 | void input_event(int event, enum e1inp_sign_type type, struct gsm_bts_trx *trx) |
| 86 | {} |
| 87 | |
| 88 | int gsm0408_rcvmsg(struct msgb *msg, u_int8_t link_id) |
| 89 | { |
| 90 | return -1; |
| 91 | } |
| 92 | |
Holger Hans Peter Freyther | 9d56d0c | 2010-04-22 19:11:37 +0800 | [diff] [blame] | 93 | static void queue_for_msc(struct bsc_msc_connection *con, struct msgb *msg) |
| 94 | { |
| 95 | if (write_queue_enqueue(&msc_con->write_queue, msg) != 0) { |
| 96 | LOGP(DINP, LOGL_ERROR, "Failed to enqueue the write.\n"); |
| 97 | msgb_free(msg); |
| 98 | } |
| 99 | } |
| 100 | |
Holger Hans Peter Freyther | 3025e19 | 2010-03-26 09:18:02 +0100 | [diff] [blame] | 101 | static void send_reset_ack(struct bsc_connection *bsc) |
Holger Hans Peter Freyther | 38a77d0 | 2010-01-30 12:45:10 +0100 | [diff] [blame] | 102 | { |
| 103 | static const u_int8_t gsm_reset_ack[] = { |
Holger Hans Peter Freyther | 38a77d0 | 2010-01-30 12:45:10 +0100 | [diff] [blame] | 104 | 0x09, 0x00, 0x03, 0x07, 0x0b, 0x04, 0x43, 0x01, |
| 105 | 0x00, 0xfe, 0x04, 0x43, 0x5c, 0x00, 0xfe, 0x03, |
| 106 | 0x00, 0x01, 0x31, |
| 107 | }; |
| 108 | |
Holger Hans Peter Freyther | 2896df7 | 2010-04-08 10:24:57 +0200 | [diff] [blame] | 109 | bsc_send_data(bsc, gsm_reset_ack, sizeof(gsm_reset_ack), IPAC_PROTO_SCCP); |
Holger Hans Peter Freyther | 38a77d0 | 2010-01-30 12:45:10 +0100 | [diff] [blame] | 110 | } |
| 111 | |
Holger Hans Peter Freyther | 906c15e | 2010-05-02 19:28:59 +0800 | [diff] [blame] | 112 | static void send_ping(struct bsc_connection *bsc) |
| 113 | { |
| 114 | static const u_int8_t id_ping[] = { |
| 115 | IPAC_MSGT_PING, |
| 116 | }; |
| 117 | |
| 118 | bsc_send_data(bsc, id_ping, sizeof(id_ping), IPAC_PROTO_IPACCESS); |
| 119 | } |
| 120 | |
Holger Hans Peter Freyther | 5078871 | 2010-06-15 18:51:33 +0800 | [diff] [blame] | 121 | static void send_pong(struct bsc_connection *bsc) |
| 122 | { |
| 123 | static const u_int8_t id_pong[] = { |
| 124 | IPAC_MSGT_PONG, |
| 125 | }; |
| 126 | |
| 127 | bsc_send_data(bsc, id_pong, sizeof(id_pong), IPAC_PROTO_IPACCESS); |
| 128 | } |
| 129 | |
Holger Hans Peter Freyther | 906c15e | 2010-05-02 19:28:59 +0800 | [diff] [blame] | 130 | static void bsc_pong_timeout(void *_bsc) |
| 131 | { |
| 132 | struct bsc_connection *bsc = _bsc; |
| 133 | |
| 134 | LOGP(DNAT, LOGL_ERROR, "BSC Nr: %d PONG timeout.\n", bsc->cfg->nr); |
| 135 | bsc_close_connection(bsc); |
| 136 | } |
| 137 | |
| 138 | static void bsc_ping_timeout(void *_bsc) |
| 139 | { |
| 140 | struct bsc_connection *bsc = _bsc; |
| 141 | |
Holger Hans Peter Freyther | da35a8d | 2010-05-05 16:57:38 +0800 | [diff] [blame] | 142 | if (bsc->nat->ping_timeout < 0) |
| 143 | return; |
| 144 | |
Holger Hans Peter Freyther | 906c15e | 2010-05-02 19:28:59 +0800 | [diff] [blame] | 145 | send_ping(bsc); |
| 146 | |
| 147 | /* send another ping in 20 seconds */ |
Holger Hans Peter Freyther | da35a8d | 2010-05-05 16:57:38 +0800 | [diff] [blame] | 148 | bsc_schedule_timer(&bsc->ping_timeout, bsc->nat->ping_timeout, 0); |
Holger Hans Peter Freyther | 906c15e | 2010-05-02 19:28:59 +0800 | [diff] [blame] | 149 | |
| 150 | /* also start a pong timer */ |
Holger Hans Peter Freyther | da35a8d | 2010-05-05 16:57:38 +0800 | [diff] [blame] | 151 | bsc_schedule_timer(&bsc->pong_timeout, bsc->nat->pong_timeout, 0); |
Holger Hans Peter Freyther | 906c15e | 2010-05-02 19:28:59 +0800 | [diff] [blame] | 152 | } |
| 153 | |
| 154 | static void start_ping_pong(struct bsc_connection *bsc) |
| 155 | { |
| 156 | bsc->pong_timeout.data = bsc; |
| 157 | bsc->pong_timeout.cb = bsc_pong_timeout; |
| 158 | bsc->ping_timeout.data = bsc; |
| 159 | bsc->ping_timeout.cb = bsc_ping_timeout; |
| 160 | |
| 161 | bsc_ping_timeout(bsc); |
| 162 | } |
| 163 | |
Holger Hans Peter Freyther | 3025e19 | 2010-03-26 09:18:02 +0100 | [diff] [blame] | 164 | static void send_id_ack(struct bsc_connection *bsc) |
Holger Hans Peter Freyther | db7ba7d | 2010-03-26 07:41:54 +0100 | [diff] [blame] | 165 | { |
| 166 | static const u_int8_t id_ack[] = { |
Holger Hans Peter Freyther | 2896df7 | 2010-04-08 10:24:57 +0200 | [diff] [blame] | 167 | IPAC_MSGT_ID_ACK |
Holger Hans Peter Freyther | db7ba7d | 2010-03-26 07:41:54 +0100 | [diff] [blame] | 168 | }; |
| 169 | |
Holger Hans Peter Freyther | 2896df7 | 2010-04-08 10:24:57 +0200 | [diff] [blame] | 170 | bsc_send_data(bsc, id_ack, sizeof(id_ack), IPAC_PROTO_IPACCESS); |
Holger Hans Peter Freyther | db7ba7d | 2010-03-26 07:41:54 +0100 | [diff] [blame] | 171 | } |
| 172 | |
Holger Hans Peter Freyther | 3025e19 | 2010-03-26 09:18:02 +0100 | [diff] [blame] | 173 | static void send_id_req(struct bsc_connection *bsc) |
Holger Hans Peter Freyther | db7ba7d | 2010-03-26 07:41:54 +0100 | [diff] [blame] | 174 | { |
| 175 | static const u_int8_t id_req[] = { |
Holger Hans Peter Freyther | 2896df7 | 2010-04-08 10:24:57 +0200 | [diff] [blame] | 176 | IPAC_MSGT_ID_GET, |
Holger Hans Peter Freyther | db7ba7d | 2010-03-26 07:41:54 +0100 | [diff] [blame] | 177 | 0x01, IPAC_IDTAG_UNIT, |
| 178 | 0x01, IPAC_IDTAG_MACADDR, |
| 179 | 0x01, IPAC_IDTAG_LOCATION1, |
| 180 | 0x01, IPAC_IDTAG_LOCATION2, |
| 181 | 0x01, IPAC_IDTAG_EQUIPVERS, |
| 182 | 0x01, IPAC_IDTAG_SWVERSION, |
| 183 | 0x01, IPAC_IDTAG_UNITNAME, |
| 184 | 0x01, IPAC_IDTAG_SERNR, |
| 185 | }; |
| 186 | |
Holger Hans Peter Freyther | 2896df7 | 2010-04-08 10:24:57 +0200 | [diff] [blame] | 187 | bsc_send_data(bsc, id_req, sizeof(id_req), IPAC_PROTO_IPACCESS); |
Holger Hans Peter Freyther | db7ba7d | 2010-03-26 07:41:54 +0100 | [diff] [blame] | 188 | } |
| 189 | |
Holger Hans Peter Freyther | 6b087d1 | 2010-04-06 17:32:58 +0200 | [diff] [blame] | 190 | static void nat_send_rlsd(struct sccp_connections *conn) |
| 191 | { |
| 192 | struct sccp_connection_released *rel; |
| 193 | struct msgb *msg; |
| 194 | |
| 195 | msg = msgb_alloc_headroom(4096, 128, "rlsd"); |
| 196 | if (!msg) { |
| 197 | LOGP(DNAT, LOGL_ERROR, "Failed to allocate clear command.\n"); |
| 198 | return; |
| 199 | } |
| 200 | |
| 201 | msg->l2h = msgb_put(msg, sizeof(*rel)); |
| 202 | rel = (struct sccp_connection_released *) msg->l2h; |
| 203 | rel->type = SCCP_MSG_TYPE_RLSD; |
| 204 | rel->release_cause = SCCP_RELEASE_CAUSE_SCCP_FAILURE; |
| 205 | rel->destination_local_reference = conn->remote_ref; |
| 206 | rel->source_local_reference = conn->patched_ref; |
| 207 | |
| 208 | ipaccess_prepend_header(msg, IPAC_PROTO_SCCP); |
| 209 | |
Holger Hans Peter Freyther | 9d56d0c | 2010-04-22 19:11:37 +0800 | [diff] [blame] | 210 | queue_for_msc(msc_con, msg); |
Holger Hans Peter Freyther | 6b087d1 | 2010-04-06 17:32:58 +0200 | [diff] [blame] | 211 | } |
| 212 | |
Holger Hans Peter Freyther | b8a3373 | 2010-04-08 11:28:12 +0200 | [diff] [blame] | 213 | static void nat_send_rlc(struct sccp_source_reference *src, |
| 214 | struct sccp_source_reference *dst) |
| 215 | { |
| 216 | struct sccp_connection_release_complete *rlc; |
| 217 | struct msgb *msg; |
| 218 | |
| 219 | msg = msgb_alloc_headroom(4096, 128, "rlc"); |
| 220 | if (!msg) { |
| 221 | LOGP(DNAT, LOGL_ERROR, "Failed to allocate clear command.\n"); |
| 222 | return; |
| 223 | } |
| 224 | |
| 225 | msg->l2h = msgb_put(msg, sizeof(*rlc)); |
| 226 | rlc = (struct sccp_connection_release_complete *) msg->l2h; |
| 227 | rlc->type = SCCP_MSG_TYPE_RLC; |
| 228 | rlc->destination_local_reference = *dst; |
| 229 | rlc->source_local_reference = *src; |
| 230 | |
| 231 | ipaccess_prepend_header(msg, IPAC_PROTO_SCCP); |
| 232 | |
Holger Hans Peter Freyther | 9d56d0c | 2010-04-22 19:11:37 +0800 | [diff] [blame] | 233 | queue_for_msc(msc_con, msg); |
Holger Hans Peter Freyther | b8a3373 | 2010-04-08 11:28:12 +0200 | [diff] [blame] | 234 | } |
| 235 | |
Holger Hans Peter Freyther | d131b79 | 2010-03-31 07:30:58 +0200 | [diff] [blame] | 236 | static void send_mgcp_reset(struct bsc_connection *bsc) |
| 237 | { |
| 238 | static const u_int8_t mgcp_reset[] = { |
| 239 | "RSIP 1 13@mgw MGCP 1.0\r\n" |
| 240 | }; |
| 241 | |
| 242 | bsc_write_mgcp(bsc, mgcp_reset, sizeof mgcp_reset - 1); |
| 243 | } |
| 244 | |
Holger Hans Peter Freyther | 6ace522 | 2010-01-12 21:15:08 +0100 | [diff] [blame] | 245 | /* |
| 246 | * Below is the handling of messages coming |
| 247 | * from the MSC and need to be forwarded to |
| 248 | * a real BSC. |
| 249 | */ |
| 250 | static void initialize_msc_if_needed() |
| 251 | { |
Holger Hans Peter Freyther | b752761 | 2010-04-07 11:20:36 +0200 | [diff] [blame] | 252 | if (nat->first_contact) |
| 253 | return; |
Holger Hans Peter Freyther | 6ace522 | 2010-01-12 21:15:08 +0100 | [diff] [blame] | 254 | |
Holger Hans Peter Freyther | b752761 | 2010-04-07 11:20:36 +0200 | [diff] [blame] | 255 | nat->first_contact = 1; |
| 256 | msc_send_reset(msc_con); |
Holger Hans Peter Freyther | 6ace522 | 2010-01-12 21:15:08 +0100 | [diff] [blame] | 257 | } |
| 258 | |
Holger Hans Peter Freyther | 3025e19 | 2010-03-26 09:18:02 +0100 | [diff] [blame] | 259 | /* |
| 260 | * Currently we are lacking refcounting so we need to copy each message. |
| 261 | */ |
Holger Hans Peter Freyther | 2896df7 | 2010-04-08 10:24:57 +0200 | [diff] [blame] | 262 | static void bsc_send_data(struct bsc_connection *bsc, const u_int8_t *data, unsigned int length, int proto) |
Holger Hans Peter Freyther | f7cb33c | 2010-03-26 07:20:59 +0100 | [diff] [blame] | 263 | { |
Holger Hans Peter Freyther | 3025e19 | 2010-03-26 09:18:02 +0100 | [diff] [blame] | 264 | struct msgb *msg; |
| 265 | |
Holger Hans Peter Freyther | 2896df7 | 2010-04-08 10:24:57 +0200 | [diff] [blame] | 266 | if (length > 4096 - 128) { |
Holger Hans Peter Freyther | 3025e19 | 2010-03-26 09:18:02 +0100 | [diff] [blame] | 267 | LOGP(DINP, LOGL_ERROR, "Can not send message of that size.\n"); |
| 268 | return; |
| 269 | } |
| 270 | |
Holger Hans Peter Freyther | 2896df7 | 2010-04-08 10:24:57 +0200 | [diff] [blame] | 271 | msg = msgb_alloc_headroom(4096, 128, "to-bsc"); |
Holger Hans Peter Freyther | 3025e19 | 2010-03-26 09:18:02 +0100 | [diff] [blame] | 272 | if (!msg) { |
| 273 | LOGP(DINP, LOGL_ERROR, "Failed to allocate memory for BSC msg.\n"); |
| 274 | return; |
| 275 | } |
| 276 | |
Holger Hans Peter Freyther | 2896df7 | 2010-04-08 10:24:57 +0200 | [diff] [blame] | 277 | msg->l2h = msgb_put(msg, length); |
Holger Hans Peter Freyther | 3025e19 | 2010-03-26 09:18:02 +0100 | [diff] [blame] | 278 | memcpy(msg->data, data, length); |
Holger Hans Peter Freyther | 2896df7 | 2010-04-08 10:24:57 +0200 | [diff] [blame] | 279 | |
| 280 | bsc_write(bsc, msg, proto); |
Holger Hans Peter Freyther | f7cb33c | 2010-03-26 07:20:59 +0100 | [diff] [blame] | 281 | } |
| 282 | |
Holger Hans Peter Freyther | 058eeb7 | 2010-01-31 09:46:21 +0100 | [diff] [blame] | 283 | static int forward_sccp_to_bts(struct msgb *msg) |
Holger Hans Peter Freyther | 6ace522 | 2010-01-12 21:15:08 +0100 | [diff] [blame] | 284 | { |
Holger Hans Peter Freyther | 49c7fb5 | 2010-06-15 18:48:55 +0800 | [diff] [blame] | 285 | struct sccp_connections *con; |
| 286 | struct bsc_connection *bsc; |
Holger Hans Peter Freyther | 0b8f69d | 2010-06-15 18:45:38 +0800 | [diff] [blame] | 287 | struct bsc_nat_parsed *parsed; |
Holger Hans Peter Freyther | 2896df7 | 2010-04-08 10:24:57 +0200 | [diff] [blame] | 288 | int proto; |
Holger Hans Peter Freyther | 24614ad | 2010-01-13 09:28:12 +0100 | [diff] [blame] | 289 | |
Holger Hans Peter Freyther | 6ace522 | 2010-01-12 21:15:08 +0100 | [diff] [blame] | 290 | /* filter, drop, patch the message? */ |
Holger Hans Peter Freyther | 0b8f69d | 2010-06-15 18:45:38 +0800 | [diff] [blame] | 291 | parsed = bsc_nat_parse(msg); |
| 292 | if (!parsed) { |
| 293 | LOGP(DNAT, LOGL_ERROR, "Can not parse msg from BSC.\n"); |
Holger Hans Peter Freyther | 058eeb7 | 2010-01-31 09:46:21 +0100 | [diff] [blame] | 294 | return -1; |
Holger Hans Peter Freyther | 0b8f69d | 2010-06-15 18:45:38 +0800 | [diff] [blame] | 295 | } |
| 296 | |
Holger Hans Peter Freyther | 1d6fb18 | 2010-01-30 11:53:30 +0100 | [diff] [blame] | 297 | if (bsc_nat_filter_ipa(DIR_BSC, msg, parsed)) |
Holger Hans Peter Freyther | 0b8f69d | 2010-06-15 18:45:38 +0800 | [diff] [blame] | 298 | goto exit; |
Holger Hans Peter Freyther | 6a97b8d | 2010-06-15 18:45:26 +0800 | [diff] [blame] | 299 | |
Holger Hans Peter Freyther | 2896df7 | 2010-04-08 10:24:57 +0200 | [diff] [blame] | 300 | proto = parsed->ipa_proto; |
| 301 | |
Holger Hans Peter Freyther | 058eeb7 | 2010-01-31 09:46:21 +0100 | [diff] [blame] | 302 | /* Route and modify the SCCP packet */ |
Holger Hans Peter Freyther | 2896df7 | 2010-04-08 10:24:57 +0200 | [diff] [blame] | 303 | if (proto == IPAC_PROTO_SCCP) { |
Holger Hans Peter Freyther | 058eeb7 | 2010-01-31 09:46:21 +0100 | [diff] [blame] | 304 | switch (parsed->sccp_type) { |
| 305 | case SCCP_MSG_TYPE_UDT: |
| 306 | /* forward UDT messages to every BSC */ |
| 307 | goto send_to_all; |
| 308 | break; |
| 309 | case SCCP_MSG_TYPE_RLSD: |
| 310 | case SCCP_MSG_TYPE_CREF: |
| 311 | case SCCP_MSG_TYPE_DT1: |
Holger Hans Peter Freyther | f46ce53 | 2010-04-06 10:22:34 +0200 | [diff] [blame] | 312 | case SCCP_MSG_TYPE_IT: |
Holger Hans Peter Freyther | 49c7fb5 | 2010-06-15 18:48:55 +0800 | [diff] [blame] | 313 | con = patch_sccp_src_ref_to_bsc(msg, parsed, nat); |
Holger Hans Peter Freyther | 465313e | 2010-06-15 18:49:53 +0800 | [diff] [blame] | 314 | if (parsed->gsm_type == BSS_MAP_MSG_ASSIGMENT_RQST) { |
Holger Hans Peter Freyther | d470286 | 2010-04-12 12:17:09 +0200 | [diff] [blame] | 315 | counter_inc(nat->stats.sccp.calls); |
| 316 | |
Holger Hans Peter Freyther | 465313e | 2010-06-15 18:49:53 +0800 | [diff] [blame] | 317 | if (con) { |
Holger Hans Peter Freyther | 3d0049f | 2010-04-18 01:35:41 +0800 | [diff] [blame] | 318 | counter_inc(con->bsc->cfg->stats.sccp.calls); |
Holger Hans Peter Freyther | 465313e | 2010-06-15 18:49:53 +0800 | [diff] [blame] | 319 | if (bsc_mgcp_assign(con, msg) != 0) |
| 320 | LOGP(DNAT, LOGL_ERROR, "Failed to assign...\n"); |
| 321 | } else |
| 322 | LOGP(DNAT, LOGL_ERROR, "Assignment command but no BSC.\n"); |
| 323 | } |
Holger Hans Peter Freyther | 16a6f70 | 2010-03-29 17:18:42 +0200 | [diff] [blame] | 324 | break; |
Holger Hans Peter Freyther | 058eeb7 | 2010-01-31 09:46:21 +0100 | [diff] [blame] | 325 | case SCCP_MSG_TYPE_CC: |
Holger Hans Peter Freyther | 49c7fb5 | 2010-06-15 18:48:55 +0800 | [diff] [blame] | 326 | con = patch_sccp_src_ref_to_bsc(msg, parsed, nat); |
| 327 | if (!con || update_sccp_src_ref(con, parsed) != 0) |
Holger Hans Peter Freyther | 16a6f70 | 2010-03-29 17:18:42 +0200 | [diff] [blame] | 328 | goto exit; |
Holger Hans Peter Freyther | 0ab6bab | 2010-06-15 18:47:49 +0800 | [diff] [blame] | 329 | break; |
| 330 | case SCCP_MSG_TYPE_RLC: |
| 331 | LOGP(DNAT, LOGL_ERROR, "Unexpected release complete from MSC.\n"); |
| 332 | goto exit; |
Holger Hans Peter Freyther | 058eeb7 | 2010-01-31 09:46:21 +0100 | [diff] [blame] | 333 | break; |
| 334 | case SCCP_MSG_TYPE_CR: |
Holger Hans Peter Freyther | 058eeb7 | 2010-01-31 09:46:21 +0100 | [diff] [blame] | 335 | /* MSC never opens a SCCP connection, fall through */ |
| 336 | default: |
| 337 | goto exit; |
| 338 | } |
Holger Hans Peter Freyther | f464ea5 | 2010-04-06 16:07:44 +0200 | [diff] [blame] | 339 | |
Holger Hans Peter Freyther | b8a3373 | 2010-04-08 11:28:12 +0200 | [diff] [blame] | 340 | if (!con && parsed->sccp_type == SCCP_MSG_TYPE_RLSD) { |
| 341 | LOGP(DNAT, LOGL_NOTICE, "Sending fake RLC on RLSD message to network.\n"); |
| 342 | /* Exchange src/dest for the reply */ |
| 343 | nat_send_rlc(parsed->dest_local_ref, parsed->src_local_ref); |
| 344 | } else if (!con) |
Holger Hans Peter Freyther | f464ea5 | 2010-04-06 16:07:44 +0200 | [diff] [blame] | 345 | LOGP(DNAT, LOGL_ERROR, "Unknown connection for msg type: 0x%x.\n", parsed->sccp_type); |
Holger Hans Peter Freyther | 058eeb7 | 2010-01-31 09:46:21 +0100 | [diff] [blame] | 346 | } |
| 347 | |
| 348 | talloc_free(parsed); |
Holger Hans Peter Freyther | 49c7fb5 | 2010-06-15 18:48:55 +0800 | [diff] [blame] | 349 | if (!con) |
Holger Hans Peter Freyther | 058eeb7 | 2010-01-31 09:46:21 +0100 | [diff] [blame] | 350 | return -1; |
Holger Hans Peter Freyther | 49c7fb5 | 2010-06-15 18:48:55 +0800 | [diff] [blame] | 351 | if (!con->bsc->authenticated) { |
Holger Hans Peter Freyther | 6c45f2e | 2010-06-15 19:06:18 +0800 | [diff] [blame] | 352 | LOGP(DNAT, LOGL_ERROR, "Selected BSC not authenticated.\n"); |
Holger Hans Peter Freyther | 3f37b8f | 2010-02-08 23:24:32 +0100 | [diff] [blame] | 353 | return -1; |
| 354 | } |
| 355 | |
Holger Hans Peter Freyther | 2896df7 | 2010-04-08 10:24:57 +0200 | [diff] [blame] | 356 | bsc_send_data(con->bsc, msg->l2h, msgb_l2len(msg), proto); |
Holger Hans Peter Freyther | 3025e19 | 2010-03-26 09:18:02 +0100 | [diff] [blame] | 357 | return 0; |
Holger Hans Peter Freyther | 058eeb7 | 2010-01-31 09:46:21 +0100 | [diff] [blame] | 358 | |
| 359 | send_to_all: |
Holger Hans Peter Freyther | 45d1181 | 2010-06-15 18:46:36 +0800 | [diff] [blame] | 360 | /* |
| 361 | * Filter Paging from the network. We do not want to send a PAGING |
| 362 | * Command to every BSC in our network. We will analys the PAGING |
| 363 | * message and then send it to the authenticated messages... |
| 364 | */ |
| 365 | if (parsed->ipa_proto == IPAC_PROTO_SCCP && parsed->gsm_type == BSS_MAP_MSG_PAGING) { |
Holger Hans Peter Freyther | 979a309 | 2010-04-17 08:07:19 +0200 | [diff] [blame] | 366 | int lac; |
| 367 | bsc = bsc_nat_find_bsc(nat, msg, &lac); |
Holger Hans Peter Freyther | 62e5843 | 2010-04-21 19:05:14 +0800 | [diff] [blame] | 368 | if (bsc && bsc->cfg->forbid_paging) |
Holger Hans Peter Freyther | a34585e | 2010-04-21 20:17:18 +0800 | [diff] [blame] | 369 | LOGP(DNAT, LOGL_DEBUG, "Paging forbidden for BTS: %d\n", bsc->cfg->nr); |
Holger Hans Peter Freyther | 62e5843 | 2010-04-21 19:05:14 +0800 | [diff] [blame] | 370 | else if (bsc) |
Holger Hans Peter Freyther | 2896df7 | 2010-04-08 10:24:57 +0200 | [diff] [blame] | 371 | bsc_send_data(bsc, msg->l2h, msgb_l2len(msg), parsed->ipa_proto); |
Holger Hans Peter Freyther | bae9da4 | 2010-03-30 05:57:42 +0200 | [diff] [blame] | 372 | else |
Holger Hans Peter Freyther | 979a309 | 2010-04-17 08:07:19 +0200 | [diff] [blame] | 373 | LOGP(DNAT, LOGL_ERROR, "Could not determine BSC for paging on lac: %d/0x%x\n", |
| 374 | lac, lac); |
Holger Hans Peter Freyther | 45d1181 | 2010-06-15 18:46:36 +0800 | [diff] [blame] | 375 | |
| 376 | goto exit; |
| 377 | } |
Holger Hans Peter Freyther | 24614ad | 2010-01-13 09:28:12 +0100 | [diff] [blame] | 378 | /* currently send this to every BSC connected */ |
Holger Hans Peter Freyther | 9a85ef3 | 2010-06-15 18:46:11 +0800 | [diff] [blame] | 379 | llist_for_each_entry(bsc, &nat->bsc_connections, list_entry) { |
Holger Hans Peter Freyther | 3f37b8f | 2010-02-08 23:24:32 +0100 | [diff] [blame] | 380 | if (!bsc->authenticated) |
| 381 | continue; |
| 382 | |
Holger Hans Peter Freyther | 2896df7 | 2010-04-08 10:24:57 +0200 | [diff] [blame] | 383 | bsc_send_data(bsc, msg->l2h, msgb_l2len(msg), parsed->ipa_proto); |
Holger Hans Peter Freyther | 24614ad | 2010-01-13 09:28:12 +0100 | [diff] [blame] | 384 | } |
Holger Hans Peter Freyther | 0b8f69d | 2010-06-15 18:45:38 +0800 | [diff] [blame] | 385 | |
| 386 | exit: |
| 387 | talloc_free(parsed); |
Holger Hans Peter Freyther | 058eeb7 | 2010-01-31 09:46:21 +0100 | [diff] [blame] | 388 | return 0; |
Holger Hans Peter Freyther | 6ace522 | 2010-01-12 21:15:08 +0100 | [diff] [blame] | 389 | } |
| 390 | |
Holger Hans Peter Freyther | baf2abe | 2010-06-15 18:47:29 +0800 | [diff] [blame] | 391 | static void msc_connection_was_lost(struct bsc_msc_connection *con) |
| 392 | { |
Holger Hans Peter Freyther | cd89537 | 2010-03-29 08:04:09 +0200 | [diff] [blame] | 393 | struct bsc_connection *bsc, *tmp; |
| 394 | |
Holger Hans Peter Freyther | a4ed81c | 2010-04-12 12:35:02 +0200 | [diff] [blame] | 395 | counter_inc(nat->stats.msc.reconn); |
| 396 | |
Holger Hans Peter Freyther | cd89537 | 2010-03-29 08:04:09 +0200 | [diff] [blame] | 397 | LOGP(DMSC, LOGL_ERROR, "Closing all connections downstream.\n"); |
| 398 | llist_for_each_entry_safe(bsc, tmp, &nat->bsc_connections, list_entry) |
Holger Hans Peter Freyther | 2f9dcf0 | 2010-04-27 13:21:39 +0800 | [diff] [blame] | 399 | bsc_close_connection(bsc); |
Holger Hans Peter Freyther | cd89537 | 2010-03-29 08:04:09 +0200 | [diff] [blame] | 400 | |
Holger Hans Peter Freyther | b752761 | 2010-04-07 11:20:36 +0200 | [diff] [blame] | 401 | nat->first_contact = 0; |
Holger Hans Peter Freyther | 241e130 | 2010-03-31 09:16:56 +0200 | [diff] [blame] | 402 | bsc_mgcp_free_endpoints(nat); |
Holger Hans Peter Freyther | cd89537 | 2010-03-29 08:04:09 +0200 | [diff] [blame] | 403 | bsc_msc_schedule_connect(con); |
Holger Hans Peter Freyther | baf2abe | 2010-06-15 18:47:29 +0800 | [diff] [blame] | 404 | } |
| 405 | |
Holger Hans Peter Freyther | 02aee14 | 2010-04-08 10:31:07 +0200 | [diff] [blame] | 406 | static void msc_send_reset(struct bsc_msc_connection *msc_con) |
Holger Hans Peter Freyther | af0ff6c | 2010-04-07 10:46:30 +0200 | [diff] [blame] | 407 | { |
| 408 | static const u_int8_t reset[] = { |
Holger Hans Peter Freyther | 7cab166 | 2010-04-07 11:11:11 +0200 | [diff] [blame] | 409 | 0x00, 0x12, 0xfd, |
Holger Hans Peter Freyther | af0ff6c | 2010-04-07 10:46:30 +0200 | [diff] [blame] | 410 | 0x09, 0x00, 0x03, 0x05, 0x07, 0x02, 0x42, 0xfe, |
| 411 | 0x02, 0x42, 0xfe, 0x06, 0x00, 0x04, 0x30, 0x04, |
| 412 | 0x01, 0x20 |
| 413 | }; |
| 414 | |
| 415 | struct msgb *msg; |
| 416 | |
| 417 | msg = msgb_alloc_headroom(4096, 128, "08.08 reset"); |
| 418 | if (!msg) { |
| 419 | LOGP(DMSC, LOGL_ERROR, "Failed to allocate reset msg.\n"); |
| 420 | return; |
| 421 | } |
| 422 | |
| 423 | msg->l2h = msgb_put(msg, sizeof(reset)); |
| 424 | memcpy(msg->l2h, reset, msgb_l2len(msg)); |
| 425 | |
Holger Hans Peter Freyther | 9d56d0c | 2010-04-22 19:11:37 +0800 | [diff] [blame] | 426 | queue_for_msc(msc_con, msg); |
Holger Hans Peter Freyther | af0ff6c | 2010-04-07 10:46:30 +0200 | [diff] [blame] | 427 | |
| 428 | LOGP(DMSC, LOGL_NOTICE, "Scheduled GSM0808 reset msg for the MSC.\n"); |
| 429 | } |
| 430 | |
Holger Hans Peter Freyther | 6f5fbfd | 2010-06-15 18:47:02 +0800 | [diff] [blame] | 431 | static int ipaccess_msc_read_cb(struct bsc_fd *bfd) |
Holger Hans Peter Freyther | 6ace522 | 2010-01-12 21:15:08 +0100 | [diff] [blame] | 432 | { |
| 433 | int error; |
| 434 | struct msgb *msg = ipaccess_read_msg(bfd, &error); |
| 435 | struct ipaccess_head *hh; |
| 436 | |
| 437 | if (!msg) { |
Holger Hans Peter Freyther | 9db7843 | 2010-04-23 00:23:03 +0800 | [diff] [blame] | 438 | if (error == 0) |
Holger Hans Peter Freyther | 418f394 | 2010-01-29 05:58:43 +0100 | [diff] [blame] | 439 | LOGP(DNAT, LOGL_FATAL, "The connection the MSC was lost, exiting\n"); |
Holger Hans Peter Freyther | 9db7843 | 2010-04-23 00:23:03 +0800 | [diff] [blame] | 440 | else |
| 441 | LOGP(DNAT, LOGL_ERROR, "Failed to parse ip access message: %d\n", error); |
Holger Hans Peter Freyther | 6ace522 | 2010-01-12 21:15:08 +0100 | [diff] [blame] | 442 | |
Holger Hans Peter Freyther | 9db7843 | 2010-04-23 00:23:03 +0800 | [diff] [blame] | 443 | bsc_msc_lost(msc_con); |
Holger Hans Peter Freyther | 6ace522 | 2010-01-12 21:15:08 +0100 | [diff] [blame] | 444 | return -1; |
| 445 | } |
| 446 | |
Holger Hans Peter Freyther | 418f394 | 2010-01-29 05:58:43 +0100 | [diff] [blame] | 447 | LOGP(DNAT, LOGL_DEBUG, "MSG from MSC: %s proto: %d\n", hexdump(msg->data, msg->len), msg->l2h[0]); |
Holger Hans Peter Freyther | 6ace522 | 2010-01-12 21:15:08 +0100 | [diff] [blame] | 448 | |
| 449 | /* handle base message handling */ |
| 450 | hh = (struct ipaccess_head *) msg->data; |
| 451 | ipaccess_rcvmsg_base(msg, bfd); |
| 452 | |
| 453 | /* initialize the networking. This includes sending a GSM08.08 message */ |
| 454 | if (hh->proto == IPAC_PROTO_IPACCESS && msg->l2h[0] == IPAC_MSGT_ID_ACK) |
| 455 | initialize_msc_if_needed(); |
| 456 | else if (hh->proto == IPAC_PROTO_SCCP) |
| 457 | forward_sccp_to_bts(msg); |
| 458 | |
Holger Hans Peter Freyther | aad68b5 | 2010-06-15 18:46:48 +0800 | [diff] [blame] | 459 | msgb_free(msg); |
Holger Hans Peter Freyther | 6ace522 | 2010-01-12 21:15:08 +0100 | [diff] [blame] | 460 | return 0; |
| 461 | } |
Holger Hans Peter Freyther | 9e2c5f5 | 2010-06-15 18:44:42 +0800 | [diff] [blame] | 462 | |
Holger Hans Peter Freyther | 6f5fbfd | 2010-06-15 18:47:02 +0800 | [diff] [blame] | 463 | static int ipaccess_msc_write_cb(struct bsc_fd *bfd, struct msgb *msg) |
| 464 | { |
| 465 | int rc; |
| 466 | rc = write(bfd->fd, msg->data, msg->len); |
| 467 | |
| 468 | if (rc != msg->len) { |
| 469 | LOGP(DNAT, LOGL_ERROR, "Failed to write MSG to MSC.\n"); |
| 470 | return -1; |
| 471 | } |
| 472 | |
| 473 | return rc; |
| 474 | } |
| 475 | |
Holger Hans Peter Freyther | 49d8068 | 2010-01-12 21:34:54 +0100 | [diff] [blame] | 476 | /* |
| 477 | * Below is the handling of messages coming |
| 478 | * from the BSC and need to be forwarded to |
| 479 | * a real BSC. |
| 480 | */ |
Holger Hans Peter Freyther | 24614ad | 2010-01-13 09:28:12 +0100 | [diff] [blame] | 481 | |
| 482 | /* |
| 483 | * Remove the connection from the connections list, |
| 484 | * remove it from the patching of SCCP header lists |
| 485 | * as well. Maybe in the future even close connection.. |
| 486 | */ |
Holger Hans Peter Freyther | 2f9dcf0 | 2010-04-27 13:21:39 +0800 | [diff] [blame] | 487 | void bsc_close_connection(struct bsc_connection *connection) |
Holger Hans Peter Freyther | 24614ad | 2010-01-13 09:28:12 +0100 | [diff] [blame] | 488 | { |
Holger Hans Peter Freyther | 058eeb7 | 2010-01-31 09:46:21 +0100 | [diff] [blame] | 489 | struct sccp_connections *sccp_patch, *tmp; |
Holger Hans Peter Freyther | 058eeb7 | 2010-01-31 09:46:21 +0100 | [diff] [blame] | 490 | |
Holger Hans Peter Freyther | aa69824 | 2010-06-15 18:46:19 +0800 | [diff] [blame] | 491 | /* stop the timeout timer */ |
| 492 | bsc_del_timer(&connection->id_timeout); |
Holger Hans Peter Freyther | 906c15e | 2010-05-02 19:28:59 +0800 | [diff] [blame] | 493 | bsc_del_timer(&connection->ping_timeout); |
| 494 | bsc_del_timer(&connection->pong_timeout); |
Holger Hans Peter Freyther | aa69824 | 2010-06-15 18:46:19 +0800 | [diff] [blame] | 495 | |
Holger Hans Peter Freyther | 058eeb7 | 2010-01-31 09:46:21 +0100 | [diff] [blame] | 496 | /* remove all SCCP connections */ |
Holger Hans Peter Freyther | 9a85ef3 | 2010-06-15 18:46:11 +0800 | [diff] [blame] | 497 | llist_for_each_entry_safe(sccp_patch, tmp, &nat->sccp_connections, list_entry) { |
Holger Hans Peter Freyther | 058eeb7 | 2010-01-31 09:46:21 +0100 | [diff] [blame] | 498 | if (sccp_patch->bsc != connection) |
| 499 | continue; |
| 500 | |
Holger Hans Peter Freyther | 4c683d1 | 2010-04-23 14:13:27 +0800 | [diff] [blame] | 501 | if (sccp_patch->has_remote_ref) |
| 502 | nat_send_rlsd(sccp_patch); |
Holger Hans Peter Freyther | 23fe7be | 2010-03-30 10:45:48 +0200 | [diff] [blame] | 503 | sccp_connection_destroy(sccp_patch); |
Holger Hans Peter Freyther | 058eeb7 | 2010-01-31 09:46:21 +0100 | [diff] [blame] | 504 | } |
| 505 | |
Holger Hans Peter Freyther | 26a4389 | 2010-04-05 23:09:27 +0200 | [diff] [blame] | 506 | /* close endpoints allocated by this BSC */ |
| 507 | bsc_mgcp_clear_endpoints_for(connection); |
| 508 | |
Holger Hans Peter Freyther | e464ed4 | 2010-04-22 12:04:36 +0800 | [diff] [blame] | 509 | bsc_unregister_fd(&connection->write_queue.bfd); |
| 510 | close(connection->write_queue.bfd.fd); |
| 511 | write_queue_clear(&connection->write_queue); |
| 512 | llist_del(&connection->list_entry); |
| 513 | |
Holger Hans Peter Freyther | 24614ad | 2010-01-13 09:28:12 +0100 | [diff] [blame] | 514 | talloc_free(connection); |
| 515 | } |
| 516 | |
Holger Hans Peter Freyther | aa69824 | 2010-06-15 18:46:19 +0800 | [diff] [blame] | 517 | static void ipaccess_close_bsc(void *data) |
| 518 | { |
Holger Hans Peter Freyther | 6d5a600 | 2010-04-17 07:58:17 +0200 | [diff] [blame] | 519 | struct sockaddr_in sock; |
| 520 | socklen_t len = sizeof(sock); |
Holger Hans Peter Freyther | aa69824 | 2010-06-15 18:46:19 +0800 | [diff] [blame] | 521 | struct bsc_connection *conn = data; |
| 522 | |
Holger Hans Peter Freyther | 6d5a600 | 2010-04-17 07:58:17 +0200 | [diff] [blame] | 523 | |
| 524 | getpeername(conn->write_queue.bfd.fd, (struct sockaddr *) &sock, &len); |
| 525 | LOGP(DNAT, LOGL_ERROR, "BSC on %s didn't respond to identity request. Closing.\n", |
| 526 | inet_ntoa(sock.sin_addr)); |
Holger Hans Peter Freyther | 2f9dcf0 | 2010-04-27 13:21:39 +0800 | [diff] [blame] | 527 | bsc_close_connection(conn); |
Holger Hans Peter Freyther | aa69824 | 2010-06-15 18:46:19 +0800 | [diff] [blame] | 528 | } |
| 529 | |
| 530 | static void ipaccess_auth_bsc(struct tlv_parsed *tvp, struct bsc_connection *bsc) |
| 531 | { |
| 532 | struct bsc_config *conf; |
| 533 | const char* token = (const char *) TLVP_VAL(tvp, IPAC_IDTAG_UNITNAME); |
| 534 | |
Holger Hans Peter Freyther | 5cdcfa6 | 2010-05-02 18:58:10 +0800 | [diff] [blame] | 535 | if (bsc->cfg) { |
| 536 | LOGP(DNAT, LOGL_ERROR, "Reauth on fd %d bsc nr %d\n", |
| 537 | bsc->write_queue.bfd.fd, bsc->cfg->nr); |
| 538 | return; |
| 539 | } |
| 540 | |
Holger Hans Peter Freyther | aa69824 | 2010-06-15 18:46:19 +0800 | [diff] [blame] | 541 | llist_for_each_entry(conf, &bsc->nat->bsc_configs, entry) { |
| 542 | if (strcmp(conf->token, token) == 0) { |
Holger Hans Peter Freyther | d470286 | 2010-04-12 12:17:09 +0200 | [diff] [blame] | 543 | counter_inc(conf->stats.net.reconn); |
Holger Hans Peter Freyther | aa69824 | 2010-06-15 18:46:19 +0800 | [diff] [blame] | 544 | bsc->authenticated = 1; |
Holger Hans Peter Freyther | 47dd494 | 2010-04-06 15:11:34 +0200 | [diff] [blame] | 545 | bsc->cfg = conf; |
Holger Hans Peter Freyther | aa69824 | 2010-06-15 18:46:19 +0800 | [diff] [blame] | 546 | bsc_del_timer(&bsc->id_timeout); |
Holger Hans Peter Freyther | 74cfab7 | 2010-05-05 17:03:44 +0800 | [diff] [blame] | 547 | LOGP(DNAT, LOGL_NOTICE, "Authenticated bsc nr: %d lac: %d on fd %d\n", |
| 548 | conf->nr, conf->lac, bsc->write_queue.bfd.fd); |
Holger Hans Peter Freyther | 906c15e | 2010-05-02 19:28:59 +0800 | [diff] [blame] | 549 | start_ping_pong(bsc); |
Holger Hans Peter Freyther | c615c26 | 2010-04-17 07:59:57 +0200 | [diff] [blame] | 550 | return; |
Holger Hans Peter Freyther | aa69824 | 2010-06-15 18:46:19 +0800 | [diff] [blame] | 551 | } |
| 552 | } |
Holger Hans Peter Freyther | c615c26 | 2010-04-17 07:59:57 +0200 | [diff] [blame] | 553 | |
Holger Hans Peter Freyther | 74cfab7 | 2010-05-05 17:03:44 +0800 | [diff] [blame] | 554 | LOGP(DNAT, LOGL_ERROR, "No bsc found for token %s on fd: %d.\n", token, |
| 555 | bsc->write_queue.bfd.fd); |
Holger Hans Peter Freyther | aa69824 | 2010-06-15 18:46:19 +0800 | [diff] [blame] | 556 | } |
| 557 | |
Holger Hans Peter Freyther | 747d654 | 2010-03-26 07:24:34 +0100 | [diff] [blame] | 558 | static int forward_sccp_to_msc(struct bsc_connection *bsc, struct msgb *msg) |
Holger Hans Peter Freyther | 24614ad | 2010-01-13 09:28:12 +0100 | [diff] [blame] | 559 | { |
Holger Hans Peter Freyther | 49c7fb5 | 2010-06-15 18:48:55 +0800 | [diff] [blame] | 560 | struct sccp_connections *con; |
Holger Hans Peter Freyther | 0b8f69d | 2010-06-15 18:45:38 +0800 | [diff] [blame] | 561 | struct bsc_nat_parsed *parsed; |
Holger Hans Peter Freyther | 24614ad | 2010-01-13 09:28:12 +0100 | [diff] [blame] | 562 | |
Holger Hans Peter Freyther | 0b8f69d | 2010-06-15 18:45:38 +0800 | [diff] [blame] | 563 | /* Parse and filter messages */ |
| 564 | parsed = bsc_nat_parse(msg); |
| 565 | if (!parsed) { |
| 566 | LOGP(DNAT, LOGL_ERROR, "Can not parse msg from BSC.\n"); |
Holger Hans Peter Freyther | d7657ff | 2010-03-30 07:35:46 +0200 | [diff] [blame] | 567 | msgb_free(msg); |
Holger Hans Peter Freyther | 0b8f69d | 2010-06-15 18:45:38 +0800 | [diff] [blame] | 568 | return -1; |
| 569 | } |
| 570 | |
Holger Hans Peter Freyther | 1d6fb18 | 2010-01-30 11:53:30 +0100 | [diff] [blame] | 571 | if (bsc_nat_filter_ipa(DIR_MSC, msg, parsed)) |
Holger Hans Peter Freyther | 0b8f69d | 2010-06-15 18:45:38 +0800 | [diff] [blame] | 572 | goto exit; |
Holger Hans Peter Freyther | 6a97b8d | 2010-06-15 18:45:26 +0800 | [diff] [blame] | 573 | |
Holger Hans Peter Freyther | bbb9d39 | 2010-04-02 03:42:44 +0200 | [diff] [blame] | 574 | /* |
| 575 | * check authentication after filtering to not reject auth |
| 576 | * responses coming from the BSC. We have to make sure that |
| 577 | * nothing from the exit path will forward things to the MSC |
| 578 | */ |
| 579 | if (!bsc->authenticated) { |
| 580 | LOGP(DNAT, LOGL_ERROR, "BSC is not authenticated.\n"); |
| 581 | msgb_free(msg); |
| 582 | return -1; |
| 583 | } |
| 584 | |
| 585 | |
Holger Hans Peter Freyther | 058eeb7 | 2010-01-31 09:46:21 +0100 | [diff] [blame] | 586 | /* modify the SCCP entries */ |
| 587 | if (parsed->ipa_proto == IPAC_PROTO_SCCP) { |
| 588 | switch (parsed->sccp_type) { |
| 589 | case SCCP_MSG_TYPE_CR: |
| 590 | if (create_sccp_src_ref(bsc, msg, parsed) != 0) |
| 591 | goto exit2; |
Holger Hans Peter Freyther | b5513ca | 2010-04-21 18:56:12 +0800 | [diff] [blame] | 592 | con = patch_sccp_src_ref_to_msc(msg, parsed, bsc); |
Holger Hans Peter Freyther | 058eeb7 | 2010-01-31 09:46:21 +0100 | [diff] [blame] | 593 | break; |
| 594 | case SCCP_MSG_TYPE_RLSD: |
| 595 | case SCCP_MSG_TYPE_CREF: |
| 596 | case SCCP_MSG_TYPE_DT1: |
| 597 | case SCCP_MSG_TYPE_CC: |
Holger Hans Peter Freyther | f46ce53 | 2010-04-06 10:22:34 +0200 | [diff] [blame] | 598 | case SCCP_MSG_TYPE_IT: |
Holger Hans Peter Freyther | b5513ca | 2010-04-21 18:56:12 +0800 | [diff] [blame] | 599 | con = patch_sccp_src_ref_to_msc(msg, parsed, bsc); |
Holger Hans Peter Freyther | 058eeb7 | 2010-01-31 09:46:21 +0100 | [diff] [blame] | 600 | break; |
| 601 | case SCCP_MSG_TYPE_RLC: |
Holger Hans Peter Freyther | b5513ca | 2010-04-21 18:56:12 +0800 | [diff] [blame] | 602 | con = patch_sccp_src_ref_to_msc(msg, parsed, bsc); |
Holger Hans Peter Freyther | f4cfc4f | 2010-03-31 09:15:05 +0200 | [diff] [blame] | 603 | remove_sccp_src_ref(bsc, msg, parsed); |
Holger Hans Peter Freyther | 058eeb7 | 2010-01-31 09:46:21 +0100 | [diff] [blame] | 604 | break; |
| 605 | case SCCP_MSG_TYPE_UDT: |
| 606 | /* simply forward everything */ |
Holger Hans Peter Freyther | 49c7fb5 | 2010-06-15 18:48:55 +0800 | [diff] [blame] | 607 | con = NULL; |
Holger Hans Peter Freyther | 058eeb7 | 2010-01-31 09:46:21 +0100 | [diff] [blame] | 608 | break; |
| 609 | default: |
Holger Hans Peter Freyther | 0ab6bab | 2010-06-15 18:47:49 +0800 | [diff] [blame] | 610 | LOGP(DNAT, LOGL_ERROR, "Not forwarding to msc sccp type: 0x%x\n", parsed->sccp_type); |
Holger Hans Peter Freyther | 49c7fb5 | 2010-06-15 18:48:55 +0800 | [diff] [blame] | 611 | con = NULL; |
Holger Hans Peter Freyther | 058eeb7 | 2010-01-31 09:46:21 +0100 | [diff] [blame] | 612 | goto exit2; |
| 613 | break; |
| 614 | } |
Holger Hans Peter Freyther | 3c3bce1 | 2010-04-01 10:16:28 +0200 | [diff] [blame] | 615 | } else if (parsed->ipa_proto == NAT_IPAC_PROTO_MGCP) { |
| 616 | bsc_mgcp_forward(bsc, msg); |
| 617 | goto exit2; |
Holger Hans Peter Freyther | 49c7fb5 | 2010-06-15 18:48:55 +0800 | [diff] [blame] | 618 | } else { |
| 619 | LOGP(DNAT, LOGL_ERROR, "Not forwarding unknown stream id: 0x%x\n", parsed->ipa_proto); |
| 620 | goto exit2; |
Holger Hans Peter Freyther | 058eeb7 | 2010-01-31 09:46:21 +0100 | [diff] [blame] | 621 | } |
| 622 | |
Holger Hans Peter Freyther | 49c7fb5 | 2010-06-15 18:48:55 +0800 | [diff] [blame] | 623 | if (con && con->bsc != bsc) { |
Holger Hans Peter Freyther | ca0c2f9 | 2010-04-21 18:49:55 +0800 | [diff] [blame] | 624 | LOGP(DNAT, LOGL_ERROR, "The connection belongs to a different BTS: input: %d con: %d\n", |
| 625 | bsc->cfg->nr, con->bsc->cfg->nr); |
Holger Hans Peter Freyther | 058eeb7 | 2010-01-31 09:46:21 +0100 | [diff] [blame] | 626 | goto exit2; |
| 627 | } |
| 628 | |
Holger Hans Peter Freyther | 24614ad | 2010-01-13 09:28:12 +0100 | [diff] [blame] | 629 | /* send the non-filtered but maybe modified msg */ |
Holger Hans Peter Freyther | 9d56d0c | 2010-04-22 19:11:37 +0800 | [diff] [blame] | 630 | queue_for_msc(msc_con, msg); |
Holger Hans Peter Freyther | 38a77d0 | 2010-01-30 12:45:10 +0100 | [diff] [blame] | 631 | talloc_free(parsed); |
Holger Hans Peter Freyther | 6f5fbfd | 2010-06-15 18:47:02 +0800 | [diff] [blame] | 632 | return 0; |
Holger Hans Peter Freyther | 0b8f69d | 2010-06-15 18:45:38 +0800 | [diff] [blame] | 633 | |
| 634 | exit: |
Holger Hans Peter Freyther | 38a77d0 | 2010-01-30 12:45:10 +0100 | [diff] [blame] | 635 | /* if we filter out the reset send an ack to the BSC */ |
| 636 | if (parsed->bssap == 0 && parsed->gsm_type == BSS_MAP_MSG_RESET) { |
Holger Hans Peter Freyther | 747d654 | 2010-03-26 07:24:34 +0100 | [diff] [blame] | 637 | send_reset_ack(bsc); |
| 638 | send_reset_ack(bsc); |
Holger Hans Peter Freyther | aa69824 | 2010-06-15 18:46:19 +0800 | [diff] [blame] | 639 | } else if (parsed->ipa_proto == IPAC_PROTO_IPACCESS) { |
| 640 | /* do we know who is handling this? */ |
| 641 | if (msg->l2h[0] == IPAC_MSGT_ID_RESP) { |
| 642 | struct tlv_parsed tvp; |
| 643 | ipaccess_idtag_parse(&tvp, |
| 644 | (unsigned char *) msg->l2h + 2, |
| 645 | msgb_l2len(msg) - 2); |
| 646 | if (TLVP_PRESENT(&tvp, IPAC_IDTAG_UNITNAME)) |
| 647 | ipaccess_auth_bsc(&tvp, bsc); |
| 648 | } |
| 649 | |
| 650 | goto exit2; |
Holger Hans Peter Freyther | 38a77d0 | 2010-01-30 12:45:10 +0100 | [diff] [blame] | 651 | } |
| 652 | |
Holger Hans Peter Freyther | 058eeb7 | 2010-01-31 09:46:21 +0100 | [diff] [blame] | 653 | exit2: |
Holger Hans Peter Freyther | 0b8f69d | 2010-06-15 18:45:38 +0800 | [diff] [blame] | 654 | talloc_free(parsed); |
Holger Hans Peter Freyther | 6f5fbfd | 2010-06-15 18:47:02 +0800 | [diff] [blame] | 655 | msgb_free(msg); |
| 656 | return -1; |
Holger Hans Peter Freyther | 24614ad | 2010-01-13 09:28:12 +0100 | [diff] [blame] | 657 | } |
| 658 | |
Holger Hans Peter Freyther | ed07a3f | 2010-06-15 18:47:10 +0800 | [diff] [blame] | 659 | static int ipaccess_bsc_read_cb(struct bsc_fd *bfd) |
Holger Hans Peter Freyther | 24614ad | 2010-01-13 09:28:12 +0100 | [diff] [blame] | 660 | { |
| 661 | int error; |
Holger Hans Peter Freyther | 747d654 | 2010-03-26 07:24:34 +0100 | [diff] [blame] | 662 | struct bsc_connection *bsc = bfd->data; |
Holger Hans Peter Freyther | 24614ad | 2010-01-13 09:28:12 +0100 | [diff] [blame] | 663 | struct msgb *msg = ipaccess_read_msg(bfd, &error); |
Holger Hans Peter Freyther | 5078871 | 2010-06-15 18:51:33 +0800 | [diff] [blame] | 664 | struct ipaccess_head *hh; |
Holger Hans Peter Freyther | 24614ad | 2010-01-13 09:28:12 +0100 | [diff] [blame] | 665 | |
| 666 | if (!msg) { |
Holger Hans Peter Freyther | 9db7843 | 2010-04-23 00:23:03 +0800 | [diff] [blame] | 667 | if (error == 0) |
Holger Hans Peter Freyther | 19c3544 | 2010-05-01 10:37:15 +0800 | [diff] [blame] | 668 | LOGP(DNAT, LOGL_ERROR, |
| 669 | "The connection to the BSC Nr: %d was lost. Cleaning it\n", |
| 670 | bsc->cfg ? bsc->cfg->nr : -1); |
Holger Hans Peter Freyther | 9db7843 | 2010-04-23 00:23:03 +0800 | [diff] [blame] | 671 | else |
Holger Hans Peter Freyther | 19c3544 | 2010-05-01 10:37:15 +0800 | [diff] [blame] | 672 | LOGP(DNAT, LOGL_ERROR, |
| 673 | "Stream error on BSC Nr: %d. Failed to parse ip access message: %d\n", |
| 674 | bsc->cfg ? bsc->cfg->nr : -1, error); |
Holger Hans Peter Freyther | 9db7843 | 2010-04-23 00:23:03 +0800 | [diff] [blame] | 675 | |
Holger Hans Peter Freyther | 2f9dcf0 | 2010-04-27 13:21:39 +0800 | [diff] [blame] | 676 | bsc_close_connection(bsc); |
Holger Hans Peter Freyther | 24614ad | 2010-01-13 09:28:12 +0100 | [diff] [blame] | 677 | return -1; |
| 678 | } |
| 679 | |
Holger Hans Peter Freyther | 24614ad | 2010-01-13 09:28:12 +0100 | [diff] [blame] | 680 | |
Holger Hans Peter Freyther | 418f394 | 2010-01-29 05:58:43 +0100 | [diff] [blame] | 681 | LOGP(DNAT, LOGL_DEBUG, "MSG from BSC: %s proto: %d\n", hexdump(msg->data, msg->len), msg->l2h[0]); |
Holger Hans Peter Freyther | 24614ad | 2010-01-13 09:28:12 +0100 | [diff] [blame] | 682 | |
| 683 | /* Handle messages from the BSC */ |
Holger Hans Peter Freyther | 5078871 | 2010-06-15 18:51:33 +0800 | [diff] [blame] | 684 | hh = (struct ipaccess_head *) msg->data; |
Holger Hans Peter Freyther | 906c15e | 2010-05-02 19:28:59 +0800 | [diff] [blame] | 685 | |
Holger Hans Peter Freyther | 5078871 | 2010-06-15 18:51:33 +0800 | [diff] [blame] | 686 | /* stop the pong timeout */ |
| 687 | if (hh->proto == IPAC_PROTO_IPACCESS) { |
| 688 | if (msg->l2h[0] == IPAC_MSGT_PONG) { |
Holger Hans Peter Freyther | 906c15e | 2010-05-02 19:28:59 +0800 | [diff] [blame] | 689 | bsc_del_timer(&bsc->pong_timeout); |
| 690 | msgb_free(msg); |
| 691 | return 0; |
Holger Hans Peter Freyther | 5078871 | 2010-06-15 18:51:33 +0800 | [diff] [blame] | 692 | } else if (msg->l2h[0] == IPAC_MSGT_PING) { |
| 693 | send_pong(bsc); |
| 694 | msgb_free(msg); |
| 695 | return 0; |
Holger Hans Peter Freyther | 906c15e | 2010-05-02 19:28:59 +0800 | [diff] [blame] | 696 | } |
| 697 | } |
| 698 | |
Holger Hans Peter Freyther | 24614ad | 2010-01-13 09:28:12 +0100 | [diff] [blame] | 699 | /* FIXME: Currently no PONG is sent to the BSC */ |
| 700 | /* FIXME: Currently no ID ACK is sent to the BSC */ |
Holger Hans Peter Freyther | 747d654 | 2010-03-26 07:24:34 +0100 | [diff] [blame] | 701 | forward_sccp_to_msc(bsc, msg); |
Holger Hans Peter Freyther | 24614ad | 2010-01-13 09:28:12 +0100 | [diff] [blame] | 702 | |
| 703 | return 0; |
| 704 | } |
| 705 | |
Holger Hans Peter Freyther | 3025e19 | 2010-03-26 09:18:02 +0100 | [diff] [blame] | 706 | static int ipaccess_bsc_write_cb(struct bsc_fd *bfd, struct msgb *msg) |
| 707 | { |
| 708 | int rc; |
| 709 | |
| 710 | rc = write(bfd->fd, msg->data, msg->len); |
| 711 | if (rc != msg->len) |
| 712 | LOGP(DNAT, LOGL_ERROR, "Failed to write message to the BSC.\n"); |
| 713 | |
| 714 | return rc; |
| 715 | } |
| 716 | |
Holger Hans Peter Freyther | 49d8068 | 2010-01-12 21:34:54 +0100 | [diff] [blame] | 717 | static int ipaccess_listen_bsc_cb(struct bsc_fd *bfd, unsigned int what) |
| 718 | { |
Holger Hans Peter Freyther | 24614ad | 2010-01-13 09:28:12 +0100 | [diff] [blame] | 719 | struct bsc_connection *bsc; |
Holger Hans Peter Freyther | 872d768 | 2010-05-05 20:33:34 +0800 | [diff] [blame^] | 720 | int fd, rc, on; |
Holger Hans Peter Freyther | 49d8068 | 2010-01-12 21:34:54 +0100 | [diff] [blame] | 721 | struct sockaddr_in sa; |
| 722 | socklen_t sa_len = sizeof(sa); |
| 723 | |
| 724 | if (!(what & BSC_FD_READ)) |
| 725 | return 0; |
| 726 | |
Holger Hans Peter Freyther | 872d768 | 2010-05-05 20:33:34 +0800 | [diff] [blame^] | 727 | fd = accept(bfd->fd, (struct sockaddr *) &sa, &sa_len); |
| 728 | if (fd < 0) { |
Holger Hans Peter Freyther | 49d8068 | 2010-01-12 21:34:54 +0100 | [diff] [blame] | 729 | perror("accept"); |
Holger Hans Peter Freyther | 872d768 | 2010-05-05 20:33:34 +0800 | [diff] [blame^] | 730 | return fd; |
Holger Hans Peter Freyther | 49d8068 | 2010-01-12 21:34:54 +0100 | [diff] [blame] | 731 | } |
| 732 | |
Holger Hans Peter Freyther | d470286 | 2010-04-12 12:17:09 +0200 | [diff] [blame] | 733 | /* count the reconnect */ |
| 734 | counter_inc(nat->stats.bsc.reconn); |
| 735 | |
Holger Hans Peter Freyther | cd89537 | 2010-03-29 08:04:09 +0200 | [diff] [blame] | 736 | /* |
| 737 | * if we are not connected to a msc... just close the socket |
| 738 | */ |
| 739 | if (!msc_con->is_connected) { |
| 740 | LOGP(DNAT, LOGL_NOTICE, "Disconnecting BSC due lack of MSC connection.\n"); |
Holger Hans Peter Freyther | 872d768 | 2010-05-05 20:33:34 +0800 | [diff] [blame^] | 741 | close(fd); |
Holger Hans Peter Freyther | cd89537 | 2010-03-29 08:04:09 +0200 | [diff] [blame] | 742 | return 0; |
| 743 | } |
| 744 | |
Holger Hans Peter Freyther | 9e938c6 | 2010-05-05 18:58:13 +0800 | [diff] [blame] | 745 | on = 1; |
Holger Hans Peter Freyther | 872d768 | 2010-05-05 20:33:34 +0800 | [diff] [blame^] | 746 | rc = setsockopt(bfd->fd, IPPROTO_TCP, TCP_NODELAY, &on, sizeof(on)); |
| 747 | if (rc != 0) |
Holger Hans Peter Freyther | 9e938c6 | 2010-05-05 18:58:13 +0800 | [diff] [blame] | 748 | LOGP(DNAT, LOGL_ERROR, "Failed to set TCP_NODELAY: %s\n", strerror(errno)); |
| 749 | |
Holger Hans Peter Freyther | 49d8068 | 2010-01-12 21:34:54 +0100 | [diff] [blame] | 750 | /* todo... do something with the connection */ |
Holger Hans Peter Freyther | da86c0a | 2010-01-12 21:35:32 +0100 | [diff] [blame] | 751 | /* todo... use GNUtls to see if we want to trust this as a BTS */ |
Holger Hans Peter Freyther | 49d8068 | 2010-01-12 21:34:54 +0100 | [diff] [blame] | 752 | |
Holger Hans Peter Freyther | 24614ad | 2010-01-13 09:28:12 +0100 | [diff] [blame] | 753 | /* |
| 754 | * |
| 755 | */ |
Holger Hans Peter Freyther | dcf8a7d | 2010-06-15 18:48:01 +0800 | [diff] [blame] | 756 | bsc = bsc_connection_alloc(nat); |
Holger Hans Peter Freyther | 24614ad | 2010-01-13 09:28:12 +0100 | [diff] [blame] | 757 | if (!bsc) { |
Holger Hans Peter Freyther | 418f394 | 2010-01-29 05:58:43 +0100 | [diff] [blame] | 758 | LOGP(DNAT, LOGL_ERROR, "Failed to allocate BSC struct.\n"); |
Holger Hans Peter Freyther | 872d768 | 2010-05-05 20:33:34 +0800 | [diff] [blame^] | 759 | close(fd); |
Holger Hans Peter Freyther | 24614ad | 2010-01-13 09:28:12 +0100 | [diff] [blame] | 760 | return -1; |
| 761 | } |
| 762 | |
Holger Hans Peter Freyther | ed07a3f | 2010-06-15 18:47:10 +0800 | [diff] [blame] | 763 | bsc->write_queue.bfd.data = bsc; |
Holger Hans Peter Freyther | 872d768 | 2010-05-05 20:33:34 +0800 | [diff] [blame^] | 764 | bsc->write_queue.bfd.fd = fd; |
Holger Hans Peter Freyther | ed07a3f | 2010-06-15 18:47:10 +0800 | [diff] [blame] | 765 | bsc->write_queue.read_cb = ipaccess_bsc_read_cb; |
Holger Hans Peter Freyther | 3025e19 | 2010-03-26 09:18:02 +0100 | [diff] [blame] | 766 | bsc->write_queue.write_cb = ipaccess_bsc_write_cb; |
Holger Hans Peter Freyther | ed07a3f | 2010-06-15 18:47:10 +0800 | [diff] [blame] | 767 | bsc->write_queue.bfd.when = BSC_FD_READ; |
| 768 | if (bsc_register_fd(&bsc->write_queue.bfd) < 0) { |
Holger Hans Peter Freyther | 418f394 | 2010-01-29 05:58:43 +0100 | [diff] [blame] | 769 | LOGP(DNAT, LOGL_ERROR, "Failed to register BSC fd.\n"); |
Holger Hans Peter Freyther | 872d768 | 2010-05-05 20:33:34 +0800 | [diff] [blame^] | 770 | close(fd); |
Holger Hans Peter Freyther | 24614ad | 2010-01-13 09:28:12 +0100 | [diff] [blame] | 771 | talloc_free(bsc); |
| 772 | return -2; |
| 773 | } |
| 774 | |
Holger Hans Peter Freyther | 74cfab7 | 2010-05-05 17:03:44 +0800 | [diff] [blame] | 775 | LOGP(DNAT, LOGL_NOTICE, "BSC connection on %d with IP: %s\n", |
Holger Hans Peter Freyther | 872d768 | 2010-05-05 20:33:34 +0800 | [diff] [blame^] | 776 | fd, inet_ntoa(sa.sin_addr)); |
Holger Hans Peter Freyther | 9a85ef3 | 2010-06-15 18:46:11 +0800 | [diff] [blame] | 777 | llist_add(&bsc->list_entry, &nat->bsc_connections); |
Holger Hans Peter Freyther | db7ba7d | 2010-03-26 07:41:54 +0100 | [diff] [blame] | 778 | send_id_ack(bsc); |
| 779 | send_id_req(bsc); |
Holger Hans Peter Freyther | d131b79 | 2010-03-31 07:30:58 +0200 | [diff] [blame] | 780 | send_mgcp_reset(bsc); |
Holger Hans Peter Freyther | aa69824 | 2010-06-15 18:46:19 +0800 | [diff] [blame] | 781 | |
| 782 | /* |
| 783 | * start the hangup timer |
| 784 | */ |
| 785 | bsc->id_timeout.data = bsc; |
| 786 | bsc->id_timeout.cb = ipaccess_close_bsc; |
Holger Hans Peter Freyther | da35a8d | 2010-05-05 16:57:38 +0800 | [diff] [blame] | 787 | bsc_schedule_timer(&bsc->id_timeout, nat->auth_timeout, 0); |
Holger Hans Peter Freyther | 49d8068 | 2010-01-12 21:34:54 +0100 | [diff] [blame] | 788 | return 0; |
| 789 | } |
| 790 | |
| 791 | static int listen_for_bsc(struct bsc_fd *bfd, struct in_addr *in_addr, int port) |
| 792 | { |
| 793 | struct sockaddr_in addr; |
| 794 | int ret, on = 1; |
| 795 | |
| 796 | bfd->fd = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP); |
| 797 | bfd->cb = ipaccess_listen_bsc_cb; |
| 798 | bfd->when = BSC_FD_READ; |
| 799 | |
| 800 | memset(&addr, 0, sizeof(addr)); |
| 801 | addr.sin_family = AF_INET; |
| 802 | addr.sin_port = htons(port); |
| 803 | addr.sin_addr.s_addr = in_addr->s_addr; |
| 804 | |
| 805 | setsockopt(bfd->fd, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on)); |
| 806 | |
| 807 | ret = bind(bfd->fd, (struct sockaddr *) &addr, sizeof(addr)); |
| 808 | if (ret < 0) { |
| 809 | fprintf(stderr, "Could not bind the BSC socket %s\n", |
| 810 | strerror(errno)); |
| 811 | return -EIO; |
| 812 | } |
| 813 | |
| 814 | ret = listen(bfd->fd, 1); |
| 815 | if (ret < 0) { |
| 816 | perror("listen"); |
| 817 | return ret; |
| 818 | } |
| 819 | |
| 820 | ret = bsc_register_fd(bfd); |
| 821 | if (ret < 0) { |
| 822 | perror("register_listen_fd"); |
| 823 | return ret; |
| 824 | } |
| 825 | return 0; |
| 826 | } |
| 827 | |
Holger Hans Peter Freyther | 9e2c5f5 | 2010-06-15 18:44:42 +0800 | [diff] [blame] | 828 | static void print_usage() |
| 829 | { |
| 830 | printf("Usage: bsc_nat\n"); |
| 831 | } |
| 832 | |
| 833 | static void print_help() |
| 834 | { |
| 835 | printf(" Some useful help...\n"); |
| 836 | printf(" -h --help this text\n"); |
| 837 | printf(" -d option --debug=DRLL:DCC:DMM:DRR:DRSL:DNM enable debugging\n"); |
| 838 | printf(" -s --disable-color\n"); |
| 839 | printf(" -c --config-file filename The config file to use.\n"); |
| 840 | printf(" -m --msc=IP. The address of the MSC.\n"); |
Holger Hans Peter Freyther | 49d8068 | 2010-01-12 21:34:54 +0100 | [diff] [blame] | 841 | printf(" -l --local=IP. The local address of this BSC.\n"); |
Holger Hans Peter Freyther | 9e2c5f5 | 2010-06-15 18:44:42 +0800 | [diff] [blame] | 842 | } |
| 843 | |
| 844 | static void handle_options(int argc, char** argv) |
| 845 | { |
| 846 | while (1) { |
| 847 | int option_index = 0, c; |
| 848 | static struct option long_options[] = { |
| 849 | {"help", 0, 0, 'h'}, |
| 850 | {"debug", 1, 0, 'd'}, |
| 851 | {"config-file", 1, 0, 'c'}, |
| 852 | {"disable-color", 0, 0, 's'}, |
| 853 | {"timestamp", 0, 0, 'T'}, |
| 854 | {"msc", 1, 0, 'm'}, |
| 855 | {"local", 1, 0, 'l'}, |
| 856 | {0, 0, 0, 0} |
| 857 | }; |
| 858 | |
| 859 | c = getopt_long(argc, argv, "hd:sTPc:m:l:", |
| 860 | long_options, &option_index); |
| 861 | if (c == -1) |
| 862 | break; |
| 863 | |
| 864 | switch (c) { |
| 865 | case 'h': |
| 866 | print_usage(); |
| 867 | print_help(); |
| 868 | exit(0); |
| 869 | case 's': |
Holger Hans Peter Freyther | fb7a934 | 2010-06-15 19:14:12 +0800 | [diff] [blame] | 870 | log_set_use_color(stderr_target, 0); |
Holger Hans Peter Freyther | 9e2c5f5 | 2010-06-15 18:44:42 +0800 | [diff] [blame] | 871 | break; |
| 872 | case 'd': |
Holger Hans Peter Freyther | fb7a934 | 2010-06-15 19:14:12 +0800 | [diff] [blame] | 873 | log_parse_category_mask(stderr_target, optarg); |
Holger Hans Peter Freyther | 9e2c5f5 | 2010-06-15 18:44:42 +0800 | [diff] [blame] | 874 | break; |
| 875 | case 'c': |
| 876 | config_file = strdup(optarg); |
| 877 | break; |
| 878 | case 'T': |
Holger Hans Peter Freyther | fb7a934 | 2010-06-15 19:14:12 +0800 | [diff] [blame] | 879 | log_set_print_timestamp(stderr_target, 1); |
Holger Hans Peter Freyther | 9e2c5f5 | 2010-06-15 18:44:42 +0800 | [diff] [blame] | 880 | break; |
| 881 | case 'm': |
Holger Hans Peter Freyther | a88742c | 2010-06-15 18:51:04 +0800 | [diff] [blame] | 882 | msc_ip = optarg; |
Holger Hans Peter Freyther | 9e2c5f5 | 2010-06-15 18:44:42 +0800 | [diff] [blame] | 883 | break; |
| 884 | case 'l': |
| 885 | inet_aton(optarg, &local_addr); |
| 886 | break; |
| 887 | default: |
| 888 | /* ignore */ |
| 889 | break; |
| 890 | } |
| 891 | } |
| 892 | } |
| 893 | |
Holger Hans Peter Freyther | 6ace522 | 2010-01-12 21:15:08 +0100 | [diff] [blame] | 894 | static void signal_handler(int signal) |
| 895 | { |
Holger Hans Peter Freyther | 6ace522 | 2010-01-12 21:15:08 +0100 | [diff] [blame] | 896 | switch (signal) { |
| 897 | case SIGABRT: |
| 898 | /* in case of abort, we want to obtain a talloc report |
| 899 | * and then return to the caller, who will abort the process */ |
| 900 | case SIGUSR1: |
| 901 | talloc_report_full(tall_bsc_ctx, stderr); |
| 902 | break; |
| 903 | default: |
| 904 | break; |
| 905 | } |
| 906 | } |
| 907 | |
Holger Hans Peter Freyther | 0b0b31c | 2010-06-15 18:51:25 +0800 | [diff] [blame] | 908 | extern void *tall_msgb_ctx; |
| 909 | extern void *tall_ctr_ctx; |
| 910 | static void talloc_init_ctx() |
| 911 | { |
| 912 | tall_bsc_ctx = talloc_named_const(NULL, 0, "nat"); |
| 913 | tall_msgb_ctx = talloc_named_const(tall_bsc_ctx, 0, "msgb"); |
| 914 | tall_ctr_ctx = talloc_named_const(tall_bsc_ctx, 0, "counter"); |
| 915 | } |
| 916 | |
Holger Hans Peter Freyther | 9e2c5f5 | 2010-06-15 18:44:42 +0800 | [diff] [blame] | 917 | int main(int argc, char** argv) |
| 918 | { |
Holger Hans Peter Freyther | 0b0b31c | 2010-06-15 18:51:25 +0800 | [diff] [blame] | 919 | talloc_init_ctx(); |
| 920 | |
Holger Hans Peter Freyther | a1597f1 | 2010-06-15 18:51:18 +0800 | [diff] [blame] | 921 | |
Holger Hans Peter Freyther | fb7a934 | 2010-06-15 19:14:12 +0800 | [diff] [blame] | 922 | log_init(&log_info); |
| 923 | stderr_target = log_target_create_stderr(); |
| 924 | log_add_target(stderr_target); |
| 925 | log_set_all_filter(stderr_target, 1); |
Holger Hans Peter Freyther | 6c45f2e | 2010-06-15 19:06:18 +0800 | [diff] [blame] | 926 | |
Holger Hans Peter Freyther | 9a85ef3 | 2010-06-15 18:46:11 +0800 | [diff] [blame] | 927 | nat = bsc_nat_alloc(); |
| 928 | if (!nat) { |
| 929 | fprintf(stderr, "Failed to allocate the BSC nat.\n"); |
| 930 | return -4; |
| 931 | } |
| 932 | |
Holger Hans Peter Freyther | f7d3335 | 2010-06-15 18:50:26 +0800 | [diff] [blame] | 933 | nat->mgcp_cfg = talloc_zero(nat, struct mgcp_config); |
Holger Hans Peter Freyther | a88742c | 2010-06-15 18:51:04 +0800 | [diff] [blame] | 934 | if (!nat->mgcp_cfg) { |
| 935 | fprintf(stderr, "Failed to allocate MGCP cfg.\n"); |
| 936 | return -5; |
| 937 | } |
| 938 | |
| 939 | /* parse options */ |
| 940 | local_addr.s_addr = INADDR_ANY; |
| 941 | handle_options(argc, argv); |
Holger Hans Peter Freyther | f7d3335 | 2010-06-15 18:50:26 +0800 | [diff] [blame] | 942 | |
Holger Hans Peter Freyther | 9a85ef3 | 2010-06-15 18:46:11 +0800 | [diff] [blame] | 943 | /* init vty and parse */ |
| 944 | bsc_nat_vty_init(nat); |
| 945 | telnet_init(NULL, 4244); |
Holger Hans Peter Freyther | f7d3335 | 2010-06-15 18:50:26 +0800 | [diff] [blame] | 946 | if (mgcp_parse_config(config_file, nat->mgcp_cfg) < 0) { |
Holger Hans Peter Freyther | 9a85ef3 | 2010-06-15 18:46:11 +0800 | [diff] [blame] | 947 | fprintf(stderr, "Failed to parse the config file: '%s'\n", config_file); |
| 948 | return -3; |
| 949 | } |
| 950 | |
Holger Hans Peter Freyther | a88742c | 2010-06-15 18:51:04 +0800 | [diff] [blame] | 951 | /* over rule the VTY config */ |
| 952 | if (msc_ip) |
| 953 | bsc_nat_set_msc_ip(nat, msc_ip); |
| 954 | |
Holger Hans Peter Freyther | 9e2c5f5 | 2010-06-15 18:44:42 +0800 | [diff] [blame] | 955 | /* seed the PRNG */ |
| 956 | srand(time(NULL)); |
| 957 | |
Holger Hans Peter Freyther | a7f8018 | 2010-03-31 13:02:22 +0200 | [diff] [blame] | 958 | /* |
| 959 | * Setup the MGCP code.. |
| 960 | */ |
Holger Hans Peter Freyther | 7b7eef6 | 2010-04-22 12:08:17 +0800 | [diff] [blame] | 961 | if (bsc_mgcp_nat_init(nat) != 0) |
Holger Hans Peter Freyther | a7f8018 | 2010-03-31 13:02:22 +0200 | [diff] [blame] | 962 | return -4; |
| 963 | |
Holger Hans Peter Freyther | 49d8068 | 2010-01-12 21:34:54 +0100 | [diff] [blame] | 964 | /* connect to the MSC */ |
Holger Hans Peter Freyther | 8139553 | 2010-04-17 07:48:45 +0200 | [diff] [blame] | 965 | msc_con = bsc_msc_create(nat->msc_ip, nat->msc_port); |
Holger Hans Peter Freyther | baf2abe | 2010-06-15 18:47:29 +0800 | [diff] [blame] | 966 | if (!msc_con) { |
| 967 | fprintf(stderr, "Creating a bsc_msc_connection failed.\n"); |
Holger Hans Peter Freyther | 6ace522 | 2010-01-12 21:15:08 +0100 | [diff] [blame] | 968 | exit(1); |
| 969 | } |
| 970 | |
Holger Hans Peter Freyther | baf2abe | 2010-06-15 18:47:29 +0800 | [diff] [blame] | 971 | msc_con->connection_loss = msc_connection_was_lost; |
| 972 | msc_con->write_queue.read_cb = ipaccess_msc_read_cb; |
| 973 | msc_con->write_queue.write_cb = ipaccess_msc_write_cb;; |
| 974 | bsc_msc_connect(msc_con); |
| 975 | |
Holger Hans Peter Freyther | 49d8068 | 2010-01-12 21:34:54 +0100 | [diff] [blame] | 976 | /* wait for the BSC */ |
Holger Hans Peter Freyther | 2d677c6 | 2010-03-26 06:51:04 +0100 | [diff] [blame] | 977 | if (listen_for_bsc(&bsc_listen, &local_addr, 5000) < 0) { |
Holger Hans Peter Freyther | 49d8068 | 2010-01-12 21:34:54 +0100 | [diff] [blame] | 978 | fprintf(stderr, "Failed to listen for BSC.\n"); |
| 979 | exit(1); |
| 980 | } |
| 981 | |
Holger Hans Peter Freyther | 6ace522 | 2010-01-12 21:15:08 +0100 | [diff] [blame] | 982 | signal(SIGABRT, &signal_handler); |
| 983 | signal(SIGUSR1, &signal_handler); |
| 984 | signal(SIGPIPE, SIG_IGN); |
| 985 | |
| 986 | while (1) { |
| 987 | bsc_select_main(0); |
| 988 | } |
| 989 | |
Holger Hans Peter Freyther | 9e2c5f5 | 2010-06-15 18:44:42 +0800 | [diff] [blame] | 990 | return 0; |
| 991 | } |