Holger Hans Peter Freyther | 97f66e2 | 2010-07-28 03:32:52 +0800 | [diff] [blame] | 1 | /* MSC related stuff... */ |
| 2 | /* |
| 3 | * (C) 2010 by Holger Hans Peter Freyther <zecke@selfish.org> |
| 4 | * (C) 2010 by On-Waves |
| 5 | * All Rights Reserved |
| 6 | * |
Holger Hans Peter Freyther | de56c22 | 2011-01-16 17:45:14 +0100 | [diff] [blame] | 7 | * This program is free software: you can redistribute it and/or modify |
| 8 | * it under the terms of the GNU Affero General Public License as published by |
| 9 | * the Free Software Foundation, either version 3 of the License, or |
Holger Hans Peter Freyther | 97f66e2 | 2010-07-28 03:32:52 +0800 | [diff] [blame] | 10 | * (at your option) any later version. |
| 11 | * |
| 12 | * This program is distributed in the hope that it will be useful, |
| 13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
Holger Hans Peter Freyther | de56c22 | 2011-01-16 17:45:14 +0100 | [diff] [blame] | 15 | * GNU Affero General Public License for more details. |
Holger Hans Peter Freyther | 97f66e2 | 2010-07-28 03:32:52 +0800 | [diff] [blame] | 16 | * |
Holger Hans Peter Freyther | de56c22 | 2011-01-16 17:45:14 +0100 | [diff] [blame] | 17 | * You should have received a copy of the GNU Affero General Public License |
| 18 | * along with this program. If not, see <http://www.gnu.org/licenses/>. |
Holger Hans Peter Freyther | 97f66e2 | 2010-07-28 03:32:52 +0800 | [diff] [blame] | 19 | * |
| 20 | */ |
| 21 | |
| 22 | #include <bsc_data.h> |
Holger Hans Peter Freyther | 0f349f2 | 2010-10-06 04:39:08 +0800 | [diff] [blame] | 23 | #include <bsc_ussd.h> |
Holger Hans Peter Freyther | 97f66e2 | 2010-07-28 03:32:52 +0800 | [diff] [blame] | 24 | #include <bss_patch.h> |
| 25 | #include <bssap_sccp.h> |
| 26 | #include <ipaccess.h> |
| 27 | #include <mtp_data.h> |
Holger Hans Peter Freyther | cbf7d18 | 2010-07-31 05:25:35 +0800 | [diff] [blame] | 28 | #include <cellmgr_debug.h> |
Holger Hans Peter Freyther | 97f66e2 | 2010-07-28 03:32:52 +0800 | [diff] [blame] | 29 | |
Holger Hans Peter Freyther | cbf7d18 | 2010-07-31 05:25:35 +0800 | [diff] [blame] | 30 | #include <osmocore/tlv.h> |
| 31 | #include <osmocore/utils.h> |
Holger Hans Peter Freyther | 97f66e2 | 2010-07-28 03:32:52 +0800 | [diff] [blame] | 32 | |
| 33 | #include <arpa/inet.h> |
| 34 | #include <sys/socket.h> |
| 35 | #include <netinet/tcp.h> |
| 36 | |
| 37 | #include <fcntl.h> |
| 38 | #include <unistd.h> |
| 39 | #include <errno.h> |
| 40 | #include <string.h> |
| 41 | |
| 42 | #define RECONNECT_TIME 10, 0 |
| 43 | #define NAT_MUX 0xfc |
| 44 | |
| 45 | static void msc_send_id_response(struct bsc_data *bsc); |
| 46 | static void msc_send(struct bsc_data *bsc, struct msgb *msg, int proto); |
Holger Hans Peter Freyther | 7b7c297 | 2010-08-07 05:41:06 +0800 | [diff] [blame] | 47 | static void msc_schedule_reconnect(struct bsc_data *bsc); |
Holger Hans Peter Freyther | 97f66e2 | 2010-07-28 03:32:52 +0800 | [diff] [blame] | 48 | |
Holger Hans Peter Freyther | 569f1e1 | 2011-01-02 18:47:49 +0100 | [diff] [blame] | 49 | int send_or_queue_bsc_msg(struct mtp_link_set *link, int sls, struct msgb *msg) |
Holger Hans Peter Freyther | a4ca6d3 | 2010-10-06 04:51:44 +0800 | [diff] [blame] | 50 | { |
Holger Hans Peter Freyther | 569f1e1 | 2011-01-02 18:47:49 +0100 | [diff] [blame] | 51 | if (mtp_link_set_submit_sccp_data(link, sls, msg->l2h, msgb_l2len(msg)) != 0) |
Holger Hans Peter Freyther | a4ca6d3 | 2010-10-06 04:51:44 +0800 | [diff] [blame] | 52 | LOGP(DMSC, LOGL_ERROR, "Could not forward SCCP message.\n"); |
| 53 | return 0; |
| 54 | } |
| 55 | |
Holger Hans Peter Freyther | 43d9eec | 2010-08-07 01:54:19 +0800 | [diff] [blame] | 56 | void msc_close_connection(struct bsc_data *bsc) |
Holger Hans Peter Freyther | 97f66e2 | 2010-07-28 03:32:52 +0800 | [diff] [blame] | 57 | { |
| 58 | struct bsc_fd *bfd = &bsc->msc_connection.bfd; |
| 59 | |
| 60 | close(bfd->fd); |
| 61 | bsc_unregister_fd(bfd); |
| 62 | bfd->fd = -1; |
Holger Hans Peter Freyther | e33d93c | 2010-08-07 02:40:35 +0800 | [diff] [blame] | 63 | bsc->msc_link_down = 1; |
Holger Hans Peter Freyther | 97f66e2 | 2010-07-28 03:32:52 +0800 | [diff] [blame] | 64 | release_bsc_resources(bsc); |
| 65 | bsc_del_timer(&bsc->ping_timeout); |
| 66 | bsc_del_timer(&bsc->pong_timeout); |
Holger Hans Peter Freyther | 98f6dd5 | 2010-10-01 20:30:53 +0800 | [diff] [blame] | 67 | bsc_del_timer(&bsc->msc_timeout); |
Holger Hans Peter Freyther | 7b7c297 | 2010-08-07 05:41:06 +0800 | [diff] [blame] | 68 | msc_schedule_reconnect(bsc); |
Holger Hans Peter Freyther | 97f66e2 | 2010-07-28 03:32:52 +0800 | [diff] [blame] | 69 | } |
| 70 | |
| 71 | static void msc_connect_timeout(void *_bsc_data) |
| 72 | { |
| 73 | struct bsc_data *bsc_data = _bsc_data; |
| 74 | |
| 75 | LOGP(DMSC, LOGL_ERROR, "Timeout on the MSC connection.\n"); |
Holger Hans Peter Freyther | 43d9eec | 2010-08-07 01:54:19 +0800 | [diff] [blame] | 76 | msc_close_connection(bsc_data); |
Holger Hans Peter Freyther | 97f66e2 | 2010-07-28 03:32:52 +0800 | [diff] [blame] | 77 | } |
| 78 | |
| 79 | static void msc_pong_timeout(void *_bsc_data) |
| 80 | { |
| 81 | struct bsc_data *bsc_data = _bsc_data; |
| 82 | LOGP(DMSC, LOGL_ERROR, "MSC didn't respond to ping. Closing.\n"); |
Holger Hans Peter Freyther | 43d9eec | 2010-08-07 01:54:19 +0800 | [diff] [blame] | 83 | msc_close_connection(bsc_data); |
Holger Hans Peter Freyther | 97f66e2 | 2010-07-28 03:32:52 +0800 | [diff] [blame] | 84 | } |
| 85 | |
| 86 | static void send_ping(struct bsc_data *bsc) |
| 87 | { |
| 88 | struct msgb *msg; |
| 89 | |
| 90 | msg = msgb_alloc_headroom(4096, 128, "ping"); |
| 91 | if (!msg) { |
| 92 | LOGP(DMSC, LOGL_ERROR, "Failed to create PING.\n"); |
| 93 | return; |
| 94 | } |
| 95 | |
| 96 | msg->l2h = msgb_put(msg, 1); |
| 97 | msg->l2h[0] = IPAC_MSGT_PING; |
| 98 | |
| 99 | msc_send(bsc, msg, IPAC_PROTO_IPACCESS); |
| 100 | } |
| 101 | |
| 102 | static void msc_ping_timeout(void *_bsc_data) |
| 103 | { |
| 104 | struct bsc_data *bsc_data = _bsc_data; |
| 105 | |
| 106 | if (bsc_data->ping_time < 0) |
| 107 | return; |
| 108 | |
| 109 | send_ping(bsc_data); |
| 110 | |
| 111 | /* send another ping in 20 seconds */ |
| 112 | bsc_schedule_timer(&bsc_data->ping_timeout, bsc_data->ping_time, 0); |
| 113 | |
| 114 | /* also start a pong timer */ |
| 115 | bsc_schedule_timer(&bsc_data->pong_timeout, bsc_data->pong_time, 0); |
| 116 | } |
| 117 | |
| 118 | /* |
| 119 | * callback with IP access data |
| 120 | */ |
| 121 | static int ipaccess_a_fd_cb(struct bsc_fd *bfd) |
| 122 | { |
| 123 | int error; |
| 124 | struct ipaccess_head *hh; |
Holger Hans Peter Freyther | 569f1e1 | 2011-01-02 18:47:49 +0100 | [diff] [blame] | 125 | struct mtp_link_set *link; |
Holger Hans Peter Freyther | 97f66e2 | 2010-07-28 03:32:52 +0800 | [diff] [blame] | 126 | struct bsc_data *bsc; |
| 127 | struct msgb *msg; |
| 128 | |
| 129 | msg = ipaccess_read_msg(bfd, &error); |
| 130 | |
| 131 | bsc = (struct bsc_data *) bfd->data; |
| 132 | |
| 133 | if (!msg) { |
| 134 | if (error == 0) |
| 135 | fprintf(stderr, "The connection to the MSC was lost, exiting\n"); |
| 136 | else |
| 137 | fprintf(stderr, "Error in the IPA stream.\n"); |
| 138 | |
Holger Hans Peter Freyther | 43d9eec | 2010-08-07 01:54:19 +0800 | [diff] [blame] | 139 | msc_close_connection(bsc); |
Holger Hans Peter Freyther | 97f66e2 | 2010-07-28 03:32:52 +0800 | [diff] [blame] | 140 | return -1; |
| 141 | } |
| 142 | |
| 143 | LOGP(DMSC, LOGL_DEBUG, "From MSC: %s proto: %d\n", hexdump(msg->data, msg->len), msg->l2h[0]); |
| 144 | |
| 145 | /* handle base message handling */ |
| 146 | hh = (struct ipaccess_head *) msg->data; |
| 147 | ipaccess_rcvmsg_base(msg, bfd); |
| 148 | |
Holger Hans Peter Freyther | 644aafb | 2011-01-03 23:51:07 +0100 | [diff] [blame] | 149 | link = bsc->link_set; |
Holger Hans Peter Freyther | 97f66e2 | 2010-07-28 03:32:52 +0800 | [diff] [blame] | 150 | |
| 151 | /* initialize the networking. This includes sending a GSM08.08 message */ |
| 152 | if (hh->proto == IPAC_PROTO_IPACCESS) { |
| 153 | if (bsc->first_contact) { |
| 154 | LOGP(DMSC, LOGL_NOTICE, "Connected to MSC. Sending reset.\n"); |
| 155 | bsc_del_timer(&bsc->msc_timeout); |
| 156 | bsc->first_contact = 0; |
Holger Hans Peter Freyther | 0c95c6a | 2010-08-07 02:37:43 +0800 | [diff] [blame] | 157 | bsc->msc_link_down = 0; |
Holger Hans Peter Freyther | 97f66e2 | 2010-07-28 03:32:52 +0800 | [diff] [blame] | 158 | msc_send_reset(bsc); |
| 159 | } |
| 160 | if (msg->l2h[0] == IPAC_MSGT_ID_GET && bsc->token) { |
| 161 | msc_send_id_response(bsc); |
| 162 | } else if (msg->l2h[0] == IPAC_MSGT_PONG) { |
| 163 | bsc_del_timer(&bsc->pong_timeout); |
| 164 | } |
| 165 | } else if (hh->proto == IPAC_PROTO_SCCP) { |
| 166 | struct sccp_parse_result result; |
| 167 | int rc; |
Holger Hans Peter Freyther | 7694381 | 2010-11-16 11:14:34 +0100 | [diff] [blame] | 168 | |
| 169 | /* we can not forward it right now */ |
| 170 | if (bsc->forward_only && link->sccp_up) { |
Holger Hans Peter Freyther | 346e1c4 | 2011-01-02 18:11:37 +0100 | [diff] [blame] | 171 | if (send_or_queue_bsc_msg(link, -1, msg) != 1) |
Holger Hans Peter Freyther | 7694381 | 2010-11-16 11:14:34 +0100 | [diff] [blame] | 172 | msgb_free(msg); |
| 173 | return 0; |
| 174 | } |
| 175 | |
| 176 | |
Holger Hans Peter Freyther | 97f66e2 | 2010-07-28 03:32:52 +0800 | [diff] [blame] | 177 | rc = bss_patch_filter_msg(msg, &result); |
| 178 | |
| 179 | if (rc == BSS_FILTER_RESET_ACK) { |
| 180 | LOGP(DMSC, LOGL_NOTICE, "Filtering reset ack from the MSC\n"); |
| 181 | } else if (rc == BSS_FILTER_RLSD) { |
| 182 | LOGP(DMSC, LOGL_DEBUG, "Filtering RLSD from the MSC\n"); |
Holger Hans Peter Freyther | 5d930f8 | 2010-10-08 23:18:15 +0800 | [diff] [blame] | 183 | update_con_state(NULL, rc, &result, msg, 1, 0); |
Holger Hans Peter Freyther | 97f66e2 | 2010-07-28 03:32:52 +0800 | [diff] [blame] | 184 | } else if (rc == BSS_FILTER_RLC) { |
| 185 | /* if we receive this we have forwarded a RLSD to the network */ |
| 186 | LOGP(DMSC, LOGL_ERROR, "RLC from the network. BAD!\n"); |
| 187 | } else if (rc == BSS_FILTER_CLEAR_COMPL) { |
| 188 | LOGP(DMSC, LOGL_ERROR, "Clear Complete from the network.\n"); |
| 189 | } else if (link->sccp_up) { |
| 190 | unsigned int sls; |
| 191 | |
Holger Hans Peter Freyther | 5d930f8 | 2010-10-08 23:18:15 +0800 | [diff] [blame] | 192 | update_con_state(NULL, rc, &result, msg, 1, 0); |
Holger Hans Peter Freyther | 97f66e2 | 2010-07-28 03:32:52 +0800 | [diff] [blame] | 193 | sls = sls_for_src_ref(result.destination_local_reference); |
| 194 | |
Holger Hans Peter Freyther | 0f349f2 | 2010-10-06 04:39:08 +0800 | [diff] [blame] | 195 | /* Check for Location Update Accept */ |
Holger Hans Peter Freyther | 5228069 | 2010-10-06 16:09:25 +0800 | [diff] [blame] | 196 | bsc_ussd_handle_in_msg(bsc, &result, msg); |
Holger Hans Peter Freyther | 0f349f2 | 2010-10-06 04:39:08 +0800 | [diff] [blame] | 197 | |
Holger Hans Peter Freyther | 97f66e2 | 2010-07-28 03:32:52 +0800 | [diff] [blame] | 198 | /* patch a possible PC */ |
| 199 | bss_rewrite_header_to_bsc(msg, link->opc, link->dpc); |
| 200 | |
| 201 | /* we can not forward it right now */ |
Holger Hans Peter Freyther | a4ca6d3 | 2010-10-06 04:51:44 +0800 | [diff] [blame] | 202 | if (send_or_queue_bsc_msg(link, sls, msg) == 1) |
Holger Hans Peter Freyther | 97f66e2 | 2010-07-28 03:32:52 +0800 | [diff] [blame] | 203 | return 0; |
Holger Hans Peter Freyther | 97f66e2 | 2010-07-28 03:32:52 +0800 | [diff] [blame] | 204 | |
Holger Hans Peter Freyther | 97f66e2 | 2010-07-28 03:32:52 +0800 | [diff] [blame] | 205 | } |
| 206 | } else if (hh->proto == NAT_MUX) { |
| 207 | mgcp_forward(bsc, msg->l2h, msgb_l2len(msg)); |
| 208 | } else { |
| 209 | LOGP(DMSC, LOGL_ERROR, "Unknown IPA proto 0x%x\n", hh->proto); |
| 210 | } |
| 211 | |
| 212 | msgb_free(msg); |
| 213 | return 0; |
| 214 | } |
| 215 | |
| 216 | static int ipaccess_write_cb(struct bsc_fd *fd, struct msgb *msg) |
| 217 | { |
| 218 | int rc; |
| 219 | |
| 220 | LOGP(DMSC, LOGL_DEBUG, "Sending to MSC: %s\n", hexdump(msg->data, msg->len)); |
| 221 | rc = write(fd->fd, msg->data, msg->len); |
| 222 | if (rc != msg->len) |
| 223 | LOGP(DMSC, LOGL_ERROR, "Could not write to MSC.\n"); |
| 224 | |
| 225 | return rc; |
| 226 | } |
| 227 | |
| 228 | /* called in the case of a non blocking connect */ |
| 229 | static int msc_connection_connect(struct bsc_fd *fd, unsigned int what) |
| 230 | { |
| 231 | int rc; |
| 232 | int val; |
| 233 | socklen_t len = sizeof(val); |
| 234 | struct bsc_data *bsc; |
| 235 | |
| 236 | bsc = (struct bsc_data *) fd->data; |
| 237 | |
| 238 | if (fd != &bsc->msc_connection.bfd) { |
| 239 | LOGP(DMSC, LOGL_ERROR, "This is only working with the MSC connection.\n"); |
| 240 | return -1; |
| 241 | } |
| 242 | |
| 243 | if ((what & BSC_FD_WRITE) == 0) |
| 244 | return -1; |
| 245 | |
| 246 | /* check the socket state */ |
| 247 | rc = getsockopt(fd->fd, SOL_SOCKET, SO_ERROR, &val, &len); |
| 248 | if (rc != 0) { |
| 249 | LOGP(DMSC, LOGL_ERROR, "getsockopt for the MSC socket failed.\n"); |
| 250 | goto error; |
| 251 | } |
| 252 | if (val != 0) { |
| 253 | LOGP(DMSC, LOGL_ERROR, "Not connected to the MSC.\n"); |
| 254 | goto error; |
| 255 | } |
| 256 | |
| 257 | |
| 258 | /* go to full operation */ |
| 259 | fd->cb = write_queue_bfd_cb; |
| 260 | fd->when = BSC_FD_READ; |
| 261 | if (!llist_empty(&bsc->msc_connection.msg_queue)) |
| 262 | fd->when |= BSC_FD_WRITE; |
| 263 | return 0; |
| 264 | |
| 265 | error: |
Holger Hans Peter Freyther | 6258539 | 2010-08-07 02:26:47 +0800 | [diff] [blame] | 266 | msc_close_connection(bsc); |
Holger Hans Peter Freyther | 97f66e2 | 2010-07-28 03:32:52 +0800 | [diff] [blame] | 267 | return -1; |
| 268 | } |
| 269 | |
Holger Hans Peter Freyther | 377ba42 | 2010-10-01 20:37:40 +0800 | [diff] [blame] | 270 | static int setnonblocking(struct bsc_fd *fd) |
Holger Hans Peter Freyther | 97f66e2 | 2010-07-28 03:32:52 +0800 | [diff] [blame] | 271 | { |
| 272 | int flags; |
| 273 | |
| 274 | flags = fcntl(fd->fd, F_GETFL); |
| 275 | if (flags < 0) { |
| 276 | perror("fcntl get failed"); |
| 277 | close(fd->fd); |
| 278 | fd->fd = -1; |
Holger Hans Peter Freyther | 377ba42 | 2010-10-01 20:37:40 +0800 | [diff] [blame] | 279 | return -1; |
Holger Hans Peter Freyther | 97f66e2 | 2010-07-28 03:32:52 +0800 | [diff] [blame] | 280 | } |
| 281 | |
| 282 | flags |= O_NONBLOCK; |
| 283 | flags = fcntl(fd->fd, F_SETFL, flags); |
| 284 | if (flags < 0) { |
| 285 | perror("fcntl get failed"); |
| 286 | close(fd->fd); |
| 287 | fd->fd = -1; |
Holger Hans Peter Freyther | 377ba42 | 2010-10-01 20:37:40 +0800 | [diff] [blame] | 288 | return -1; |
Holger Hans Peter Freyther | 97f66e2 | 2010-07-28 03:32:52 +0800 | [diff] [blame] | 289 | } |
Holger Hans Peter Freyther | 377ba42 | 2010-10-01 20:37:40 +0800 | [diff] [blame] | 290 | |
| 291 | return 0; |
Holger Hans Peter Freyther | 97f66e2 | 2010-07-28 03:32:52 +0800 | [diff] [blame] | 292 | } |
| 293 | |
| 294 | static int connect_to_msc(struct bsc_fd *fd, const char *ip, int port, int tos) |
| 295 | { |
| 296 | struct sockaddr_in sin; |
| 297 | int on = 1, ret; |
| 298 | |
| 299 | LOGP(DMSC, LOGL_NOTICE, "Attempting to connect MSC at %s:%d\n", ip, port); |
| 300 | |
| 301 | fd->fd = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP); |
| 302 | |
| 303 | if (fd->fd < 0) { |
| 304 | perror("Creating TCP socket failed"); |
| 305 | return fd->fd; |
| 306 | } |
| 307 | |
| 308 | /* make it non blocking */ |
Holger Hans Peter Freyther | 377ba42 | 2010-10-01 20:37:40 +0800 | [diff] [blame] | 309 | if (setnonblocking(fd) != 0) |
| 310 | return -1; |
Holger Hans Peter Freyther | 97f66e2 | 2010-07-28 03:32:52 +0800 | [diff] [blame] | 311 | |
| 312 | memset(&sin, 0, sizeof(sin)); |
| 313 | sin.sin_family = AF_INET; |
| 314 | sin.sin_port = htons(port); |
| 315 | inet_aton(ip, &sin.sin_addr); |
| 316 | |
| 317 | setsockopt(fd->fd, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on)); |
| 318 | ret = setsockopt(fd->fd, IPPROTO_TCP, TCP_NODELAY, &on, sizeof(on)); |
| 319 | if (ret != 0) |
| 320 | LOGP(DMSC, LOGL_ERROR, "Failed to set TCP_NODELAY: %s\n", strerror(errno)); |
| 321 | ret = setsockopt(fd->fd, IPPROTO_IP, IP_TOS, &tos, sizeof(tos)); |
| 322 | if (ret != 0) |
| 323 | LOGP(DMSC, LOGL_ERROR, "Failed to set IP_TOS: %s\n", strerror(errno)); |
| 324 | |
| 325 | ret = connect(fd->fd, (struct sockaddr *) &sin, sizeof(sin)); |
| 326 | |
| 327 | if (ret == -1 && errno == EINPROGRESS) { |
| 328 | LOGP(DMSC, LOGL_ERROR, "MSC Connection in progress\n"); |
| 329 | fd->when = BSC_FD_WRITE; |
| 330 | fd->cb = msc_connection_connect; |
| 331 | } else if (ret < 0) { |
| 332 | perror("Connection failed"); |
| 333 | close(fd->fd); |
| 334 | fd->fd = -1; |
| 335 | return ret; |
| 336 | } else { |
| 337 | fd->when = BSC_FD_READ; |
| 338 | fd->cb = write_queue_bfd_cb; |
| 339 | } |
| 340 | |
| 341 | ret = bsc_register_fd(fd); |
| 342 | if (ret < 0) { |
| 343 | perror("Registering the fd failed"); |
| 344 | close(fd->fd); |
| 345 | fd->fd = -1; |
| 346 | return ret; |
| 347 | } |
| 348 | |
| 349 | return ret; |
| 350 | } |
| 351 | |
| 352 | static void msc_reconnect(void *_data) |
| 353 | { |
| 354 | int rc; |
| 355 | struct bsc_data *bsc = (struct bsc_data *) _data; |
| 356 | |
| 357 | bsc_del_timer(&bsc->reconnect_timer); |
| 358 | bsc->first_contact = 1; |
| 359 | |
| 360 | rc = connect_to_msc(&bsc->msc_connection.bfd, bsc->msc_address, 5000, bsc->msc_ip_dscp); |
| 361 | if (rc < 0) { |
| 362 | fprintf(stderr, "Opening the MSC connection failed. Trying again\n"); |
| 363 | bsc_schedule_timer(&bsc->reconnect_timer, RECONNECT_TIME); |
| 364 | return; |
| 365 | } |
| 366 | |
| 367 | bsc->msc_timeout.cb = msc_connect_timeout; |
| 368 | bsc->msc_timeout.data = bsc; |
| 369 | bsc_schedule_timer(&bsc->msc_timeout, bsc->msc_time, 0); |
| 370 | } |
| 371 | |
Holger Hans Peter Freyther | 7b7c297 | 2010-08-07 05:41:06 +0800 | [diff] [blame] | 372 | static void msc_schedule_reconnect(struct bsc_data *bsc) |
Holger Hans Peter Freyther | 97f66e2 | 2010-07-28 03:32:52 +0800 | [diff] [blame] | 373 | { |
| 374 | bsc_schedule_timer(&bsc->reconnect_timer, RECONNECT_TIME); |
| 375 | } |
| 376 | |
| 377 | /* |
| 378 | * mgcp forwarding is below |
| 379 | */ |
| 380 | static int mgcp_do_write(struct bsc_fd *fd, struct msgb *msg) |
| 381 | { |
| 382 | int ret; |
| 383 | |
| 384 | LOGP(DMGCP, LOGL_DEBUG, "Sending msg to MGCP GW size: %u\n", msg->len); |
| 385 | |
| 386 | ret = write(fd->fd, msg->data, msg->len); |
| 387 | if (ret != msg->len) |
| 388 | LOGP(DMGCP, LOGL_ERROR, "Failed to forward message to MGCP GW (%s).\n", strerror(errno)); |
| 389 | |
| 390 | return ret; |
| 391 | } |
| 392 | |
| 393 | static int mgcp_do_read(struct bsc_fd *fd) |
| 394 | { |
| 395 | struct msgb *mgcp; |
| 396 | int ret; |
| 397 | |
| 398 | mgcp = msgb_alloc_headroom(4096, 128, "mgcp_from_gw"); |
| 399 | if (!mgcp) { |
| 400 | LOGP(DMGCP, LOGL_ERROR, "Failed to allocate MGCP message.\n"); |
| 401 | return -1; |
| 402 | } |
| 403 | |
| 404 | ret = read(fd->fd, mgcp->data, 4096 - 128); |
| 405 | if (ret <= 0) { |
| 406 | LOGP(DMGCP, LOGL_ERROR, "Failed to read: %d/%s\n", errno, strerror(errno)); |
| 407 | msgb_free(mgcp); |
| 408 | return -1; |
| 409 | } else if (ret > 4096 - 128) { |
| 410 | LOGP(DMGCP, LOGL_ERROR, "Too much data: %d\n", ret); |
| 411 | msgb_free(mgcp); |
| 412 | return -1; |
| 413 | } |
| 414 | |
| 415 | mgcp->l2h = msgb_put(mgcp, ret); |
| 416 | msc_send(fd->data, mgcp, NAT_MUX); |
| 417 | return 0; |
| 418 | } |
| 419 | |
Holger Hans Peter Freyther | 5aa1701 | 2010-07-31 04:37:26 +0800 | [diff] [blame] | 420 | void mgcp_forward(struct bsc_data *bsc, const uint8_t *data, unsigned int length) |
Holger Hans Peter Freyther | 97f66e2 | 2010-07-28 03:32:52 +0800 | [diff] [blame] | 421 | { |
| 422 | struct msgb *mgcp; |
| 423 | |
| 424 | if (length > 4096) { |
| 425 | LOGP(DMGCP, LOGL_ERROR, "Can not forward too big message.\n"); |
| 426 | return; |
| 427 | } |
| 428 | |
| 429 | mgcp = msgb_alloc(4096, "mgcp_to_gw"); |
| 430 | if (!mgcp) { |
| 431 | LOGP(DMGCP, LOGL_ERROR, "Failed to send message.\n"); |
| 432 | return; |
| 433 | } |
| 434 | |
| 435 | msgb_put(mgcp, length); |
| 436 | memcpy(mgcp->data, data, mgcp->len); |
| 437 | if (write_queue_enqueue(&bsc->mgcp_agent, mgcp) != 0) { |
| 438 | LOGP(DMGCP, LOGL_FATAL, "Could not queue message to MGCP GW.\n"); |
| 439 | msgb_free(mgcp); |
| 440 | } |
| 441 | } |
| 442 | |
| 443 | static int mgcp_create_port(struct bsc_data *bsc) |
| 444 | { |
| 445 | int on; |
| 446 | struct sockaddr_in addr; |
| 447 | |
| 448 | bsc->mgcp_agent.bfd.fd = socket(AF_INET, SOCK_DGRAM, 0); |
| 449 | if (bsc->mgcp_agent.bfd.fd < 0) { |
| 450 | LOGP(DMGCP, LOGL_FATAL, "Failed to create UDP socket errno: %d\n", errno); |
| 451 | return -1; |
| 452 | } |
| 453 | |
| 454 | on = 1; |
| 455 | setsockopt(bsc->mgcp_agent.bfd.fd, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on)); |
| 456 | |
| 457 | /* try to bind the socket */ |
| 458 | memset(&addr, 0, sizeof(addr)); |
| 459 | addr.sin_family = AF_INET; |
| 460 | addr.sin_addr.s_addr = htonl(INADDR_LOOPBACK); |
| 461 | addr.sin_port = 0; |
| 462 | |
| 463 | if (bind(bsc->mgcp_agent.bfd.fd, (struct sockaddr *) &addr, sizeof(addr)) < 0) { |
| 464 | LOGP(DMGCP, LOGL_FATAL, "Failed to bind to any port.\n"); |
| 465 | close(bsc->mgcp_agent.bfd.fd); |
| 466 | bsc->mgcp_agent.bfd.fd = -1; |
| 467 | return -1; |
| 468 | } |
| 469 | |
| 470 | /* connect to the remote */ |
| 471 | addr.sin_port = htons(2427); |
| 472 | if (connect(bsc->mgcp_agent.bfd.fd, (struct sockaddr *) & addr, sizeof(addr)) < 0) { |
| 473 | LOGP(DMGCP, LOGL_FATAL, "Failed to connect to local MGCP GW. %s\n", strerror(errno)); |
| 474 | close(bsc->mgcp_agent.bfd.fd); |
| 475 | bsc->mgcp_agent.bfd.fd = -1; |
| 476 | return -1; |
| 477 | } |
| 478 | |
| 479 | write_queue_init(&bsc->mgcp_agent, 10); |
| 480 | bsc->mgcp_agent.bfd.data = bsc; |
| 481 | bsc->mgcp_agent.bfd.when = BSC_FD_READ; |
| 482 | bsc->mgcp_agent.read_cb = mgcp_do_read; |
| 483 | bsc->mgcp_agent.write_cb = mgcp_do_write; |
| 484 | |
| 485 | if (bsc_register_fd(&bsc->mgcp_agent.bfd) != 0) { |
| 486 | LOGP(DMGCP, LOGL_FATAL, "Failed to register BFD\n"); |
| 487 | close(bsc->mgcp_agent.bfd.fd); |
| 488 | bsc->mgcp_agent.bfd.fd = -1; |
| 489 | return -1; |
| 490 | } |
| 491 | |
| 492 | return 0; |
| 493 | } |
| 494 | |
Holger Hans Peter Freyther | 594ee9a | 2010-11-16 11:03:19 +0100 | [diff] [blame] | 495 | int msc_init(struct bsc_data *bsc, int mgcp) |
Holger Hans Peter Freyther | 97f66e2 | 2010-07-28 03:32:52 +0800 | [diff] [blame] | 496 | { |
| 497 | write_queue_init(&bsc->msc_connection, 100); |
| 498 | bsc->reconnect_timer.cb = msc_reconnect; |
| 499 | bsc->reconnect_timer.data = bsc; |
| 500 | bsc->msc_connection.read_cb = ipaccess_a_fd_cb; |
| 501 | bsc->msc_connection.write_cb = ipaccess_write_cb; |
| 502 | bsc->msc_connection.bfd.data = bsc; |
Holger Hans Peter Freyther | 0c95c6a | 2010-08-07 02:37:43 +0800 | [diff] [blame] | 503 | bsc->msc_link_down = 1; |
Holger Hans Peter Freyther | 97f66e2 | 2010-07-28 03:32:52 +0800 | [diff] [blame] | 504 | |
| 505 | /* handle the timeout */ |
| 506 | bsc->ping_timeout.cb = msc_ping_timeout; |
| 507 | bsc->ping_timeout.data = bsc; |
| 508 | bsc->pong_timeout.cb = msc_pong_timeout; |
| 509 | bsc->pong_timeout.data = bsc; |
| 510 | |
| 511 | /* create MGCP port */ |
Holger Hans Peter Freyther | 594ee9a | 2010-11-16 11:03:19 +0100 | [diff] [blame] | 512 | if (mgcp && mgcp_create_port(bsc) != 0) |
Holger Hans Peter Freyther | 97f66e2 | 2010-07-28 03:32:52 +0800 | [diff] [blame] | 513 | return -1; |
Holger Hans Peter Freyther | 7b7c297 | 2010-08-07 05:41:06 +0800 | [diff] [blame] | 514 | |
| 515 | /* now connect to the BSC */ |
| 516 | msc_schedule_reconnect(bsc); |
Holger Hans Peter Freyther | 97f66e2 | 2010-07-28 03:32:52 +0800 | [diff] [blame] | 517 | return 0; |
| 518 | } |
| 519 | |
| 520 | static void msc_send(struct bsc_data *bsc, struct msgb *msg, int proto) |
| 521 | { |
Holger Hans Peter Freyther | 7b7c297 | 2010-08-07 05:41:06 +0800 | [diff] [blame] | 522 | if (bsc->msc_link_down) { |
| 523 | LOGP(DMSC, LOGL_NOTICE, "Dropping data due lack of MSC connection.\n"); |
| 524 | msgb_free(msg); |
| 525 | return; |
| 526 | } |
| 527 | |
Holger Hans Peter Freyther | 97f66e2 | 2010-07-28 03:32:52 +0800 | [diff] [blame] | 528 | ipaccess_prepend_header(msg, proto); |
| 529 | |
| 530 | if (write_queue_enqueue(&bsc->msc_connection, msg) != 0) { |
| 531 | LOGP(DMSC, LOGL_FATAL, "Failed to queue MSG for the MSC.\n"); |
| 532 | msgb_free(msg); |
| 533 | return; |
| 534 | } |
| 535 | } |
| 536 | |
| 537 | void msc_send_rlc(struct bsc_data *bsc, |
| 538 | struct sccp_source_reference *src, struct sccp_source_reference *dst) |
| 539 | { |
| 540 | struct msgb *msg; |
| 541 | |
Holger Hans Peter Freyther | e250ac3 | 2011-01-21 12:50:02 +0100 | [diff] [blame^] | 542 | if (bsc->msc_link_down) { |
| 543 | LOGP(DMSC, LOGL_NOTICE, "Not releasing connection due lack of connection.\n"); |
| 544 | return; |
| 545 | } |
| 546 | |
Holger Hans Peter Freyther | 97f66e2 | 2010-07-28 03:32:52 +0800 | [diff] [blame] | 547 | msg = create_sccp_rlc(src, dst); |
| 548 | if (!msg) |
| 549 | return; |
| 550 | |
| 551 | msc_send(bsc, msg, IPAC_PROTO_SCCP); |
| 552 | } |
| 553 | |
| 554 | void msc_send_reset(struct bsc_data *bsc) |
| 555 | { |
| 556 | struct msgb *msg; |
| 557 | |
Holger Hans Peter Freyther | e250ac3 | 2011-01-21 12:50:02 +0100 | [diff] [blame^] | 558 | if (bsc->msc_link_down) { |
| 559 | LOGP(DMSC, LOGL_NOTICE, "Not sending reset due lack of connection.\n"); |
| 560 | return; |
| 561 | } |
| 562 | |
Holger Hans Peter Freyther | 97f66e2 | 2010-07-28 03:32:52 +0800 | [diff] [blame] | 563 | msg = create_reset(); |
| 564 | if (!msg) |
| 565 | return; |
| 566 | |
| 567 | msc_send(bsc, msg, IPAC_PROTO_SCCP); |
| 568 | msc_ping_timeout(bsc); |
| 569 | } |
| 570 | |
| 571 | static void msc_send_id_response(struct bsc_data *bsc) |
| 572 | { |
| 573 | struct msgb *msg; |
| 574 | |
| 575 | msg = msgb_alloc_headroom(4096, 128, "id resp"); |
| 576 | msg->l2h = msgb_v_put(msg, IPAC_MSGT_ID_RESP); |
| 577 | msgb_l16tv_put(msg, strlen(bsc->token) + 1, |
Holger Hans Peter Freyther | 5aa1701 | 2010-07-31 04:37:26 +0800 | [diff] [blame] | 578 | IPAC_IDTAG_UNITNAME, (uint8_t *) bsc->token); |
Holger Hans Peter Freyther | 97f66e2 | 2010-07-28 03:32:52 +0800 | [diff] [blame] | 579 | |
| 580 | msc_send(bsc, msg, IPAC_PROTO_IPACCESS); |
| 581 | } |
| 582 | |
Holger Hans Peter Freyther | 594ee9a | 2010-11-16 11:03:19 +0100 | [diff] [blame] | 583 | void msc_send_direct(struct bsc_data *bsc, struct msgb *msg) |
| 584 | { |
| 585 | return msc_send(bsc, msg, IPAC_PROTO_SCCP); |
| 586 | } |
| 587 | |
Holger Hans Peter Freyther | 97f66e2 | 2010-07-28 03:32:52 +0800 | [diff] [blame] | 588 | void msc_send_msg(struct bsc_data *bsc, int rc, struct sccp_parse_result *result, struct msgb *_msg) |
| 589 | { |
| 590 | struct msgb *msg; |
| 591 | |
| 592 | if (bsc->msc_connection.bfd.fd < 0) { |
| 593 | LOGP(DMSC, LOGL_ERROR, "No connection to the MSC. dropping\n"); |
| 594 | return; |
| 595 | } |
| 596 | |
Holger Hans Peter Freyther | 0f349f2 | 2010-10-06 04:39:08 +0800 | [diff] [blame] | 597 | bsc_ussd_handle_out_msg(bsc, result, _msg); |
| 598 | |
Holger Hans Peter Freyther | 97f66e2 | 2010-07-28 03:32:52 +0800 | [diff] [blame] | 599 | msg = msgb_alloc_headroom(4096, 128, "SCCP to MSC"); |
| 600 | if (!msg) { |
| 601 | LOGP(DMSC, LOGL_ERROR, "Failed to alloc MSC msg.\n"); |
| 602 | return; |
| 603 | } |
| 604 | |
| 605 | bss_rewrite_header_for_msc(rc, msg, _msg, result); |
| 606 | msc_send(bsc, msg, IPAC_PROTO_SCCP); |
| 607 | } |