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 | |
Holger Hans Peter Freyther | 84ec871 | 2011-02-15 20:01:47 +0100 | [diff] [blame] | 22 | #include <msc_connection.h> |
Holger Hans Peter Freyther | 97f66e2 | 2010-07-28 03:32:52 +0800 | [diff] [blame] | 23 | #include <bsc_data.h> |
Holger Hans Peter Freyther | e86c02e | 2011-02-10 15:32:14 +0100 | [diff] [blame] | 24 | #include <bsc_sccp.h> |
Holger Hans Peter Freyther | 97f66e2 | 2010-07-28 03:32:52 +0800 | [diff] [blame] | 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 | 84ec871 | 2011-02-15 20:01:47 +0100 | [diff] [blame] | 30 | #include <osmocore/talloc.h> |
Holger Hans Peter Freyther | cbf7d18 | 2010-07-31 05:25:35 +0800 | [diff] [blame] | 31 | #include <osmocore/tlv.h> |
| 32 | #include <osmocore/utils.h> |
Holger Hans Peter Freyther | 97f66e2 | 2010-07-28 03:32:52 +0800 | [diff] [blame] | 33 | |
| 34 | #include <arpa/inet.h> |
| 35 | #include <sys/socket.h> |
| 36 | #include <netinet/tcp.h> |
| 37 | |
| 38 | #include <fcntl.h> |
| 39 | #include <unistd.h> |
| 40 | #include <errno.h> |
| 41 | #include <string.h> |
| 42 | |
| 43 | #define RECONNECT_TIME 10, 0 |
| 44 | #define NAT_MUX 0xfc |
| 45 | |
Holger Hans Peter Freyther | 84ec871 | 2011-02-15 20:01:47 +0100 | [diff] [blame] | 46 | static void msc_send_id_response(struct msc_connection *bsc); |
| 47 | static void msc_send(struct msc_connection *bsc, struct msgb *msg, int proto); |
| 48 | static void msc_schedule_reconnect(struct msc_connection *bsc); |
Holger Hans Peter Freyther | c5200fc | 2011-02-16 22:35:30 +0100 | [diff] [blame] | 49 | static void mgcp_forward(struct msc_connection *fw, const uint8_t *data, unsigned int length); |
Holger Hans Peter Freyther | 97f66e2 | 2010-07-28 03:32:52 +0800 | [diff] [blame] | 50 | |
Holger Hans Peter Freyther | 569f1e1 | 2011-01-02 18:47:49 +0100 | [diff] [blame] | 51 | 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] | 52 | { |
Holger Hans Peter Freyther | 569f1e1 | 2011-01-02 18:47:49 +0100 | [diff] [blame] | 53 | 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] | 54 | LOGP(DMSC, LOGL_ERROR, "Could not forward SCCP message.\n"); |
| 55 | return 0; |
| 56 | } |
| 57 | |
Holger Hans Peter Freyther | 84ec871 | 2011-02-15 20:01:47 +0100 | [diff] [blame] | 58 | void msc_close_connection(struct msc_connection *fw) |
Holger Hans Peter Freyther | 97f66e2 | 2010-07-28 03:32:52 +0800 | [diff] [blame] | 59 | { |
Holger Hans Peter Freyther | e86c02e | 2011-02-10 15:32:14 +0100 | [diff] [blame] | 60 | struct bsc_fd *bfd = &fw->msc_connection.bfd; |
Holger Hans Peter Freyther | 97f66e2 | 2010-07-28 03:32:52 +0800 | [diff] [blame] | 61 | |
| 62 | close(bfd->fd); |
| 63 | bsc_unregister_fd(bfd); |
| 64 | bfd->fd = -1; |
Holger Hans Peter Freyther | e86c02e | 2011-02-10 15:32:14 +0100 | [diff] [blame] | 65 | fw->msc_link_down = 1; |
| 66 | release_bsc_resources(fw); |
| 67 | bsc_del_timer(&fw->ping_timeout); |
| 68 | bsc_del_timer(&fw->pong_timeout); |
| 69 | bsc_del_timer(&fw->msc_timeout); |
| 70 | msc_schedule_reconnect(fw); |
Holger Hans Peter Freyther | 97f66e2 | 2010-07-28 03:32:52 +0800 | [diff] [blame] | 71 | } |
| 72 | |
Holger Hans Peter Freyther | e86c02e | 2011-02-10 15:32:14 +0100 | [diff] [blame] | 73 | static void msc_connect_timeout(void *_fw_data) |
Holger Hans Peter Freyther | 97f66e2 | 2010-07-28 03:32:52 +0800 | [diff] [blame] | 74 | { |
Holger Hans Peter Freyther | 84ec871 | 2011-02-15 20:01:47 +0100 | [diff] [blame] | 75 | struct msc_connection *fw = _fw_data; |
Holger Hans Peter Freyther | 97f66e2 | 2010-07-28 03:32:52 +0800 | [diff] [blame] | 76 | |
| 77 | LOGP(DMSC, LOGL_ERROR, "Timeout on the MSC connection.\n"); |
Holger Hans Peter Freyther | e86c02e | 2011-02-10 15:32:14 +0100 | [diff] [blame] | 78 | msc_close_connection(fw); |
Holger Hans Peter Freyther | 97f66e2 | 2010-07-28 03:32:52 +0800 | [diff] [blame] | 79 | } |
| 80 | |
Holger Hans Peter Freyther | e86c02e | 2011-02-10 15:32:14 +0100 | [diff] [blame] | 81 | static void msc_pong_timeout(void *_fw_data) |
Holger Hans Peter Freyther | 97f66e2 | 2010-07-28 03:32:52 +0800 | [diff] [blame] | 82 | { |
Holger Hans Peter Freyther | 84ec871 | 2011-02-15 20:01:47 +0100 | [diff] [blame] | 83 | struct msc_connection *fw = _fw_data; |
Holger Hans Peter Freyther | 97f66e2 | 2010-07-28 03:32:52 +0800 | [diff] [blame] | 84 | LOGP(DMSC, LOGL_ERROR, "MSC didn't respond to ping. Closing.\n"); |
Holger Hans Peter Freyther | e86c02e | 2011-02-10 15:32:14 +0100 | [diff] [blame] | 85 | msc_close_connection(fw); |
Holger Hans Peter Freyther | 97f66e2 | 2010-07-28 03:32:52 +0800 | [diff] [blame] | 86 | } |
| 87 | |
Holger Hans Peter Freyther | 84ec871 | 2011-02-15 20:01:47 +0100 | [diff] [blame] | 88 | static void send_ping(struct msc_connection *fw) |
Holger Hans Peter Freyther | 97f66e2 | 2010-07-28 03:32:52 +0800 | [diff] [blame] | 89 | { |
| 90 | struct msgb *msg; |
| 91 | |
| 92 | msg = msgb_alloc_headroom(4096, 128, "ping"); |
| 93 | if (!msg) { |
| 94 | LOGP(DMSC, LOGL_ERROR, "Failed to create PING.\n"); |
| 95 | return; |
| 96 | } |
| 97 | |
| 98 | msg->l2h = msgb_put(msg, 1); |
| 99 | msg->l2h[0] = IPAC_MSGT_PING; |
| 100 | |
Holger Hans Peter Freyther | e86c02e | 2011-02-10 15:32:14 +0100 | [diff] [blame] | 101 | msc_send(fw, msg, IPAC_PROTO_IPACCESS); |
Holger Hans Peter Freyther | 97f66e2 | 2010-07-28 03:32:52 +0800 | [diff] [blame] | 102 | } |
| 103 | |
Holger Hans Peter Freyther | e86c02e | 2011-02-10 15:32:14 +0100 | [diff] [blame] | 104 | static void msc_ping_timeout(void *_fw_data) |
Holger Hans Peter Freyther | 97f66e2 | 2010-07-28 03:32:52 +0800 | [diff] [blame] | 105 | { |
Holger Hans Peter Freyther | 84ec871 | 2011-02-15 20:01:47 +0100 | [diff] [blame] | 106 | struct msc_connection *fw = _fw_data; |
Holger Hans Peter Freyther | 97f66e2 | 2010-07-28 03:32:52 +0800 | [diff] [blame] | 107 | |
Holger Hans Peter Freyther | e86c02e | 2011-02-10 15:32:14 +0100 | [diff] [blame] | 108 | if (fw->ping_time < 0) |
Holger Hans Peter Freyther | 97f66e2 | 2010-07-28 03:32:52 +0800 | [diff] [blame] | 109 | return; |
| 110 | |
Holger Hans Peter Freyther | e86c02e | 2011-02-10 15:32:14 +0100 | [diff] [blame] | 111 | send_ping(fw); |
Holger Hans Peter Freyther | 97f66e2 | 2010-07-28 03:32:52 +0800 | [diff] [blame] | 112 | |
| 113 | /* send another ping in 20 seconds */ |
Holger Hans Peter Freyther | e86c02e | 2011-02-10 15:32:14 +0100 | [diff] [blame] | 114 | bsc_schedule_timer(&fw->ping_timeout, fw->ping_time, 0); |
Holger Hans Peter Freyther | 97f66e2 | 2010-07-28 03:32:52 +0800 | [diff] [blame] | 115 | |
| 116 | /* also start a pong timer */ |
Holger Hans Peter Freyther | e86c02e | 2011-02-10 15:32:14 +0100 | [diff] [blame] | 117 | bsc_schedule_timer(&fw->pong_timeout, fw->pong_time, 0); |
Holger Hans Peter Freyther | 97f66e2 | 2010-07-28 03:32:52 +0800 | [diff] [blame] | 118 | } |
| 119 | |
| 120 | /* |
| 121 | * callback with IP access data |
| 122 | */ |
| 123 | static int ipaccess_a_fd_cb(struct bsc_fd *bfd) |
| 124 | { |
| 125 | int error; |
| 126 | struct ipaccess_head *hh; |
Holger Hans Peter Freyther | 84ec871 | 2011-02-15 20:01:47 +0100 | [diff] [blame] | 127 | struct msc_connection *fw; |
Holger Hans Peter Freyther | 97f66e2 | 2010-07-28 03:32:52 +0800 | [diff] [blame] | 128 | struct msgb *msg; |
| 129 | |
Holger Hans Peter Freyther | e86c02e | 2011-02-10 15:32:14 +0100 | [diff] [blame] | 130 | fw = bfd->data; |
Holger Hans Peter Freyther | 97f66e2 | 2010-07-28 03:32:52 +0800 | [diff] [blame] | 131 | msg = ipaccess_read_msg(bfd, &error); |
| 132 | |
Holger Hans Peter Freyther | 97f66e2 | 2010-07-28 03:32:52 +0800 | [diff] [blame] | 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 | e86c02e | 2011-02-10 15:32:14 +0100 | [diff] [blame] | 139 | msc_close_connection(fw); |
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 | 97f66e2 | 2010-07-28 03:32:52 +0800 | [diff] [blame] | 149 | /* initialize the networking. This includes sending a GSM08.08 message */ |
| 150 | if (hh->proto == IPAC_PROTO_IPACCESS) { |
Holger Hans Peter Freyther | e86c02e | 2011-02-10 15:32:14 +0100 | [diff] [blame] | 151 | if (fw->first_contact) { |
Holger Hans Peter Freyther | 97f66e2 | 2010-07-28 03:32:52 +0800 | [diff] [blame] | 152 | LOGP(DMSC, LOGL_NOTICE, "Connected to MSC. Sending reset.\n"); |
Holger Hans Peter Freyther | e86c02e | 2011-02-10 15:32:14 +0100 | [diff] [blame] | 153 | bsc_del_timer(&fw->msc_timeout); |
| 154 | fw->first_contact = 0; |
| 155 | fw->msc_link_down = 0; |
| 156 | msc_send_reset(fw); |
Holger Hans Peter Freyther | 97f66e2 | 2010-07-28 03:32:52 +0800 | [diff] [blame] | 157 | } |
Holger Hans Peter Freyther | e86c02e | 2011-02-10 15:32:14 +0100 | [diff] [blame] | 158 | if (msg->l2h[0] == IPAC_MSGT_ID_GET && fw->token) { |
| 159 | msc_send_id_response(fw); |
Holger Hans Peter Freyther | 97f66e2 | 2010-07-28 03:32:52 +0800 | [diff] [blame] | 160 | } else if (msg->l2h[0] == IPAC_MSGT_PONG) { |
Holger Hans Peter Freyther | e86c02e | 2011-02-10 15:32:14 +0100 | [diff] [blame] | 161 | bsc_del_timer(&fw->pong_timeout); |
Holger Hans Peter Freyther | 97f66e2 | 2010-07-28 03:32:52 +0800 | [diff] [blame] | 162 | } |
| 163 | } else if (hh->proto == IPAC_PROTO_SCCP) { |
Holger Hans Peter Freyther | 3d4d8c7 | 2011-02-15 21:14:09 +0100 | [diff] [blame] | 164 | msc_dispatch_sccp(fw, msg); |
Holger Hans Peter Freyther | 97f66e2 | 2010-07-28 03:32:52 +0800 | [diff] [blame] | 165 | } else if (hh->proto == NAT_MUX) { |
Holger Hans Peter Freyther | e86c02e | 2011-02-10 15:32:14 +0100 | [diff] [blame] | 166 | mgcp_forward(fw, msg->l2h, msgb_l2len(msg)); |
Holger Hans Peter Freyther | 97f66e2 | 2010-07-28 03:32:52 +0800 | [diff] [blame] | 167 | } else { |
| 168 | LOGP(DMSC, LOGL_ERROR, "Unknown IPA proto 0x%x\n", hh->proto); |
| 169 | } |
| 170 | |
| 171 | msgb_free(msg); |
| 172 | return 0; |
| 173 | } |
| 174 | |
| 175 | static int ipaccess_write_cb(struct bsc_fd *fd, struct msgb *msg) |
| 176 | { |
| 177 | int rc; |
| 178 | |
| 179 | LOGP(DMSC, LOGL_DEBUG, "Sending to MSC: %s\n", hexdump(msg->data, msg->len)); |
| 180 | rc = write(fd->fd, msg->data, msg->len); |
| 181 | if (rc != msg->len) |
| 182 | LOGP(DMSC, LOGL_ERROR, "Could not write to MSC.\n"); |
| 183 | |
| 184 | return rc; |
| 185 | } |
| 186 | |
| 187 | /* called in the case of a non blocking connect */ |
| 188 | static int msc_connection_connect(struct bsc_fd *fd, unsigned int what) |
| 189 | { |
| 190 | int rc; |
| 191 | int val; |
| 192 | socklen_t len = sizeof(val); |
Holger Hans Peter Freyther | 84ec871 | 2011-02-15 20:01:47 +0100 | [diff] [blame] | 193 | struct msc_connection *fw; |
Holger Hans Peter Freyther | 97f66e2 | 2010-07-28 03:32:52 +0800 | [diff] [blame] | 194 | |
Holger Hans Peter Freyther | e86c02e | 2011-02-10 15:32:14 +0100 | [diff] [blame] | 195 | fw = fd->data; |
Holger Hans Peter Freyther | 97f66e2 | 2010-07-28 03:32:52 +0800 | [diff] [blame] | 196 | |
Holger Hans Peter Freyther | e86c02e | 2011-02-10 15:32:14 +0100 | [diff] [blame] | 197 | if (fd != &fw->msc_connection.bfd) { |
Holger Hans Peter Freyther | 97f66e2 | 2010-07-28 03:32:52 +0800 | [diff] [blame] | 198 | LOGP(DMSC, LOGL_ERROR, "This is only working with the MSC connection.\n"); |
| 199 | return -1; |
| 200 | } |
| 201 | |
| 202 | if ((what & BSC_FD_WRITE) == 0) |
| 203 | return -1; |
| 204 | |
| 205 | /* check the socket state */ |
| 206 | rc = getsockopt(fd->fd, SOL_SOCKET, SO_ERROR, &val, &len); |
| 207 | if (rc != 0) { |
| 208 | LOGP(DMSC, LOGL_ERROR, "getsockopt for the MSC socket failed.\n"); |
| 209 | goto error; |
| 210 | } |
| 211 | if (val != 0) { |
| 212 | LOGP(DMSC, LOGL_ERROR, "Not connected to the MSC.\n"); |
| 213 | goto error; |
| 214 | } |
| 215 | |
| 216 | |
| 217 | /* go to full operation */ |
| 218 | fd->cb = write_queue_bfd_cb; |
| 219 | fd->when = BSC_FD_READ; |
Holger Hans Peter Freyther | e86c02e | 2011-02-10 15:32:14 +0100 | [diff] [blame] | 220 | if (!llist_empty(&fw->msc_connection.msg_queue)) |
Holger Hans Peter Freyther | 97f66e2 | 2010-07-28 03:32:52 +0800 | [diff] [blame] | 221 | fd->when |= BSC_FD_WRITE; |
| 222 | return 0; |
| 223 | |
| 224 | error: |
Holger Hans Peter Freyther | e86c02e | 2011-02-10 15:32:14 +0100 | [diff] [blame] | 225 | msc_close_connection(fw); |
Holger Hans Peter Freyther | 97f66e2 | 2010-07-28 03:32:52 +0800 | [diff] [blame] | 226 | return -1; |
| 227 | } |
| 228 | |
Holger Hans Peter Freyther | 377ba42 | 2010-10-01 20:37:40 +0800 | [diff] [blame] | 229 | static int setnonblocking(struct bsc_fd *fd) |
Holger Hans Peter Freyther | 97f66e2 | 2010-07-28 03:32:52 +0800 | [diff] [blame] | 230 | { |
| 231 | int flags; |
| 232 | |
| 233 | flags = fcntl(fd->fd, F_GETFL); |
| 234 | if (flags < 0) { |
| 235 | perror("fcntl get failed"); |
| 236 | close(fd->fd); |
| 237 | fd->fd = -1; |
Holger Hans Peter Freyther | 377ba42 | 2010-10-01 20:37:40 +0800 | [diff] [blame] | 238 | return -1; |
Holger Hans Peter Freyther | 97f66e2 | 2010-07-28 03:32:52 +0800 | [diff] [blame] | 239 | } |
| 240 | |
| 241 | flags |= O_NONBLOCK; |
| 242 | flags = fcntl(fd->fd, F_SETFL, flags); |
| 243 | if (flags < 0) { |
| 244 | perror("fcntl get failed"); |
| 245 | close(fd->fd); |
| 246 | fd->fd = -1; |
Holger Hans Peter Freyther | 377ba42 | 2010-10-01 20:37:40 +0800 | [diff] [blame] | 247 | return -1; |
Holger Hans Peter Freyther | 97f66e2 | 2010-07-28 03:32:52 +0800 | [diff] [blame] | 248 | } |
Holger Hans Peter Freyther | 377ba42 | 2010-10-01 20:37:40 +0800 | [diff] [blame] | 249 | |
| 250 | return 0; |
Holger Hans Peter Freyther | 97f66e2 | 2010-07-28 03:32:52 +0800 | [diff] [blame] | 251 | } |
| 252 | |
| 253 | static int connect_to_msc(struct bsc_fd *fd, const char *ip, int port, int tos) |
| 254 | { |
| 255 | struct sockaddr_in sin; |
| 256 | int on = 1, ret; |
| 257 | |
| 258 | LOGP(DMSC, LOGL_NOTICE, "Attempting to connect MSC at %s:%d\n", ip, port); |
| 259 | |
| 260 | fd->fd = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP); |
| 261 | |
| 262 | if (fd->fd < 0) { |
| 263 | perror("Creating TCP socket failed"); |
| 264 | return fd->fd; |
| 265 | } |
| 266 | |
| 267 | /* make it non blocking */ |
Holger Hans Peter Freyther | 377ba42 | 2010-10-01 20:37:40 +0800 | [diff] [blame] | 268 | if (setnonblocking(fd) != 0) |
| 269 | return -1; |
Holger Hans Peter Freyther | 97f66e2 | 2010-07-28 03:32:52 +0800 | [diff] [blame] | 270 | |
| 271 | memset(&sin, 0, sizeof(sin)); |
| 272 | sin.sin_family = AF_INET; |
| 273 | sin.sin_port = htons(port); |
| 274 | inet_aton(ip, &sin.sin_addr); |
| 275 | |
| 276 | setsockopt(fd->fd, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on)); |
| 277 | ret = setsockopt(fd->fd, IPPROTO_TCP, TCP_NODELAY, &on, sizeof(on)); |
| 278 | if (ret != 0) |
| 279 | LOGP(DMSC, LOGL_ERROR, "Failed to set TCP_NODELAY: %s\n", strerror(errno)); |
| 280 | ret = setsockopt(fd->fd, IPPROTO_IP, IP_TOS, &tos, sizeof(tos)); |
| 281 | if (ret != 0) |
| 282 | LOGP(DMSC, LOGL_ERROR, "Failed to set IP_TOS: %s\n", strerror(errno)); |
| 283 | |
| 284 | ret = connect(fd->fd, (struct sockaddr *) &sin, sizeof(sin)); |
| 285 | |
| 286 | if (ret == -1 && errno == EINPROGRESS) { |
| 287 | LOGP(DMSC, LOGL_ERROR, "MSC Connection in progress\n"); |
| 288 | fd->when = BSC_FD_WRITE; |
| 289 | fd->cb = msc_connection_connect; |
| 290 | } else if (ret < 0) { |
| 291 | perror("Connection failed"); |
| 292 | close(fd->fd); |
| 293 | fd->fd = -1; |
| 294 | return ret; |
| 295 | } else { |
| 296 | fd->when = BSC_FD_READ; |
| 297 | fd->cb = write_queue_bfd_cb; |
| 298 | } |
| 299 | |
| 300 | ret = bsc_register_fd(fd); |
| 301 | if (ret < 0) { |
| 302 | perror("Registering the fd failed"); |
| 303 | close(fd->fd); |
| 304 | fd->fd = -1; |
| 305 | return ret; |
| 306 | } |
| 307 | |
| 308 | return ret; |
| 309 | } |
| 310 | |
| 311 | static void msc_reconnect(void *_data) |
| 312 | { |
| 313 | int rc; |
Holger Hans Peter Freyther | 84ec871 | 2011-02-15 20:01:47 +0100 | [diff] [blame] | 314 | struct msc_connection *fw = _data; |
Holger Hans Peter Freyther | 97f66e2 | 2010-07-28 03:32:52 +0800 | [diff] [blame] | 315 | |
Holger Hans Peter Freyther | e86c02e | 2011-02-10 15:32:14 +0100 | [diff] [blame] | 316 | bsc_del_timer(&fw->reconnect_timer); |
| 317 | fw->first_contact = 1; |
Holger Hans Peter Freyther | 97f66e2 | 2010-07-28 03:32:52 +0800 | [diff] [blame] | 318 | |
Holger Hans Peter Freyther | 84ec871 | 2011-02-15 20:01:47 +0100 | [diff] [blame] | 319 | rc = connect_to_msc(&fw->msc_connection.bfd, fw->ip, 5000, fw->dscp); |
Holger Hans Peter Freyther | 97f66e2 | 2010-07-28 03:32:52 +0800 | [diff] [blame] | 320 | if (rc < 0) { |
| 321 | fprintf(stderr, "Opening the MSC connection failed. Trying again\n"); |
Holger Hans Peter Freyther | e86c02e | 2011-02-10 15:32:14 +0100 | [diff] [blame] | 322 | bsc_schedule_timer(&fw->reconnect_timer, RECONNECT_TIME); |
Holger Hans Peter Freyther | 97f66e2 | 2010-07-28 03:32:52 +0800 | [diff] [blame] | 323 | return; |
| 324 | } |
| 325 | |
Holger Hans Peter Freyther | e86c02e | 2011-02-10 15:32:14 +0100 | [diff] [blame] | 326 | fw->msc_timeout.cb = msc_connect_timeout; |
| 327 | fw->msc_timeout.data = fw; |
| 328 | bsc_schedule_timer(&fw->msc_timeout, fw->msc_time, 0); |
Holger Hans Peter Freyther | 97f66e2 | 2010-07-28 03:32:52 +0800 | [diff] [blame] | 329 | } |
| 330 | |
Holger Hans Peter Freyther | 84ec871 | 2011-02-15 20:01:47 +0100 | [diff] [blame] | 331 | static void msc_schedule_reconnect(struct msc_connection *fw) |
Holger Hans Peter Freyther | 97f66e2 | 2010-07-28 03:32:52 +0800 | [diff] [blame] | 332 | { |
Holger Hans Peter Freyther | e86c02e | 2011-02-10 15:32:14 +0100 | [diff] [blame] | 333 | bsc_schedule_timer(&fw->reconnect_timer, RECONNECT_TIME); |
Holger Hans Peter Freyther | 97f66e2 | 2010-07-28 03:32:52 +0800 | [diff] [blame] | 334 | } |
| 335 | |
| 336 | /* |
| 337 | * mgcp forwarding is below |
| 338 | */ |
Holger Hans Peter Freyther | c5200fc | 2011-02-16 22:35:30 +0100 | [diff] [blame] | 339 | /* send a RSIP to the MGCP GW */ |
| 340 | void msc_mgcp_reset(struct msc_connection *msc) |
| 341 | { |
| 342 | static const char mgcp_reset[] = { |
| 343 | "RSIP 1 13@mgw MGCP 1.0\r\n" |
| 344 | }; |
| 345 | |
| 346 | mgcp_forward(msc, (const uint8_t *) mgcp_reset, strlen(mgcp_reset)); |
| 347 | } |
| 348 | |
Holger Hans Peter Freyther | 97f66e2 | 2010-07-28 03:32:52 +0800 | [diff] [blame] | 349 | static int mgcp_do_write(struct bsc_fd *fd, struct msgb *msg) |
| 350 | { |
| 351 | int ret; |
| 352 | |
| 353 | LOGP(DMGCP, LOGL_DEBUG, "Sending msg to MGCP GW size: %u\n", msg->len); |
| 354 | |
| 355 | ret = write(fd->fd, msg->data, msg->len); |
| 356 | if (ret != msg->len) |
| 357 | LOGP(DMGCP, LOGL_ERROR, "Failed to forward message to MGCP GW (%s).\n", strerror(errno)); |
| 358 | |
| 359 | return ret; |
| 360 | } |
| 361 | |
| 362 | static int mgcp_do_read(struct bsc_fd *fd) |
| 363 | { |
| 364 | struct msgb *mgcp; |
| 365 | int ret; |
| 366 | |
| 367 | mgcp = msgb_alloc_headroom(4096, 128, "mgcp_from_gw"); |
| 368 | if (!mgcp) { |
| 369 | LOGP(DMGCP, LOGL_ERROR, "Failed to allocate MGCP message.\n"); |
| 370 | return -1; |
| 371 | } |
| 372 | |
| 373 | ret = read(fd->fd, mgcp->data, 4096 - 128); |
| 374 | if (ret <= 0) { |
| 375 | LOGP(DMGCP, LOGL_ERROR, "Failed to read: %d/%s\n", errno, strerror(errno)); |
| 376 | msgb_free(mgcp); |
| 377 | return -1; |
| 378 | } else if (ret > 4096 - 128) { |
| 379 | LOGP(DMGCP, LOGL_ERROR, "Too much data: %d\n", ret); |
| 380 | msgb_free(mgcp); |
| 381 | return -1; |
| 382 | } |
| 383 | |
| 384 | mgcp->l2h = msgb_put(mgcp, ret); |
| 385 | msc_send(fd->data, mgcp, NAT_MUX); |
| 386 | return 0; |
| 387 | } |
| 388 | |
Holger Hans Peter Freyther | c5200fc | 2011-02-16 22:35:30 +0100 | [diff] [blame] | 389 | static void mgcp_forward(struct msc_connection *fw, const uint8_t *data, unsigned int length) |
Holger Hans Peter Freyther | 97f66e2 | 2010-07-28 03:32:52 +0800 | [diff] [blame] | 390 | { |
| 391 | struct msgb *mgcp; |
| 392 | |
| 393 | if (length > 4096) { |
| 394 | LOGP(DMGCP, LOGL_ERROR, "Can not forward too big message.\n"); |
| 395 | return; |
| 396 | } |
| 397 | |
| 398 | mgcp = msgb_alloc(4096, "mgcp_to_gw"); |
| 399 | if (!mgcp) { |
| 400 | LOGP(DMGCP, LOGL_ERROR, "Failed to send message.\n"); |
| 401 | return; |
| 402 | } |
| 403 | |
| 404 | msgb_put(mgcp, length); |
| 405 | memcpy(mgcp->data, data, mgcp->len); |
Holger Hans Peter Freyther | e86c02e | 2011-02-10 15:32:14 +0100 | [diff] [blame] | 406 | if (write_queue_enqueue(&fw->mgcp_agent, mgcp) != 0) { |
Holger Hans Peter Freyther | 97f66e2 | 2010-07-28 03:32:52 +0800 | [diff] [blame] | 407 | LOGP(DMGCP, LOGL_FATAL, "Could not queue message to MGCP GW.\n"); |
| 408 | msgb_free(mgcp); |
| 409 | } |
| 410 | } |
| 411 | |
Holger Hans Peter Freyther | 84ec871 | 2011-02-15 20:01:47 +0100 | [diff] [blame] | 412 | static int mgcp_create_port(struct msc_connection *fw) |
Holger Hans Peter Freyther | 97f66e2 | 2010-07-28 03:32:52 +0800 | [diff] [blame] | 413 | { |
| 414 | int on; |
| 415 | struct sockaddr_in addr; |
| 416 | |
Holger Hans Peter Freyther | e86c02e | 2011-02-10 15:32:14 +0100 | [diff] [blame] | 417 | fw->mgcp_agent.bfd.fd = socket(AF_INET, SOCK_DGRAM, 0); |
| 418 | if (fw->mgcp_agent.bfd.fd < 0) { |
Holger Hans Peter Freyther | 97f66e2 | 2010-07-28 03:32:52 +0800 | [diff] [blame] | 419 | LOGP(DMGCP, LOGL_FATAL, "Failed to create UDP socket errno: %d\n", errno); |
| 420 | return -1; |
| 421 | } |
| 422 | |
| 423 | on = 1; |
Holger Hans Peter Freyther | e86c02e | 2011-02-10 15:32:14 +0100 | [diff] [blame] | 424 | setsockopt(fw->mgcp_agent.bfd.fd, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on)); |
Holger Hans Peter Freyther | 97f66e2 | 2010-07-28 03:32:52 +0800 | [diff] [blame] | 425 | |
| 426 | /* try to bind the socket */ |
| 427 | memset(&addr, 0, sizeof(addr)); |
| 428 | addr.sin_family = AF_INET; |
| 429 | addr.sin_addr.s_addr = htonl(INADDR_LOOPBACK); |
| 430 | addr.sin_port = 0; |
| 431 | |
Holger Hans Peter Freyther | e86c02e | 2011-02-10 15:32:14 +0100 | [diff] [blame] | 432 | if (bind(fw->mgcp_agent.bfd.fd, (struct sockaddr *) &addr, sizeof(addr)) < 0) { |
Holger Hans Peter Freyther | 97f66e2 | 2010-07-28 03:32:52 +0800 | [diff] [blame] | 433 | LOGP(DMGCP, LOGL_FATAL, "Failed to bind to any port.\n"); |
Holger Hans Peter Freyther | e86c02e | 2011-02-10 15:32:14 +0100 | [diff] [blame] | 434 | close(fw->mgcp_agent.bfd.fd); |
| 435 | fw->mgcp_agent.bfd.fd = -1; |
Holger Hans Peter Freyther | 97f66e2 | 2010-07-28 03:32:52 +0800 | [diff] [blame] | 436 | return -1; |
| 437 | } |
| 438 | |
| 439 | /* connect to the remote */ |
| 440 | addr.sin_port = htons(2427); |
Holger Hans Peter Freyther | e86c02e | 2011-02-10 15:32:14 +0100 | [diff] [blame] | 441 | if (connect(fw->mgcp_agent.bfd.fd, (struct sockaddr *) & addr, sizeof(addr)) < 0) { |
Holger Hans Peter Freyther | 97f66e2 | 2010-07-28 03:32:52 +0800 | [diff] [blame] | 442 | LOGP(DMGCP, LOGL_FATAL, "Failed to connect to local MGCP GW. %s\n", strerror(errno)); |
Holger Hans Peter Freyther | e86c02e | 2011-02-10 15:32:14 +0100 | [diff] [blame] | 443 | close(fw->mgcp_agent.bfd.fd); |
| 444 | fw->mgcp_agent.bfd.fd = -1; |
Holger Hans Peter Freyther | 97f66e2 | 2010-07-28 03:32:52 +0800 | [diff] [blame] | 445 | return -1; |
| 446 | } |
| 447 | |
Holger Hans Peter Freyther | e86c02e | 2011-02-10 15:32:14 +0100 | [diff] [blame] | 448 | write_queue_init(&fw->mgcp_agent, 10); |
| 449 | fw->mgcp_agent.bfd.data = fw; |
| 450 | fw->mgcp_agent.bfd.when = BSC_FD_READ; |
| 451 | fw->mgcp_agent.read_cb = mgcp_do_read; |
| 452 | fw->mgcp_agent.write_cb = mgcp_do_write; |
Holger Hans Peter Freyther | 97f66e2 | 2010-07-28 03:32:52 +0800 | [diff] [blame] | 453 | |
Holger Hans Peter Freyther | e86c02e | 2011-02-10 15:32:14 +0100 | [diff] [blame] | 454 | if (bsc_register_fd(&fw->mgcp_agent.bfd) != 0) { |
Holger Hans Peter Freyther | 97f66e2 | 2010-07-28 03:32:52 +0800 | [diff] [blame] | 455 | LOGP(DMGCP, LOGL_FATAL, "Failed to register BFD\n"); |
Holger Hans Peter Freyther | e86c02e | 2011-02-10 15:32:14 +0100 | [diff] [blame] | 456 | close(fw->mgcp_agent.bfd.fd); |
| 457 | fw->mgcp_agent.bfd.fd = -1; |
Holger Hans Peter Freyther | 97f66e2 | 2010-07-28 03:32:52 +0800 | [diff] [blame] | 458 | return -1; |
| 459 | } |
| 460 | |
| 461 | return 0; |
| 462 | } |
| 463 | |
Holger Hans Peter Freyther | 84ec871 | 2011-02-15 20:01:47 +0100 | [diff] [blame] | 464 | static void msc_send(struct msc_connection *fw, struct msgb *msg, int proto) |
Holger Hans Peter Freyther | 97f66e2 | 2010-07-28 03:32:52 +0800 | [diff] [blame] | 465 | { |
Holger Hans Peter Freyther | e86c02e | 2011-02-10 15:32:14 +0100 | [diff] [blame] | 466 | if (fw->msc_link_down) { |
Holger Hans Peter Freyther | 7b7c297 | 2010-08-07 05:41:06 +0800 | [diff] [blame] | 467 | LOGP(DMSC, LOGL_NOTICE, "Dropping data due lack of MSC connection.\n"); |
| 468 | msgb_free(msg); |
| 469 | return; |
| 470 | } |
| 471 | |
Holger Hans Peter Freyther | 97f66e2 | 2010-07-28 03:32:52 +0800 | [diff] [blame] | 472 | ipaccess_prepend_header(msg, proto); |
| 473 | |
Holger Hans Peter Freyther | e86c02e | 2011-02-10 15:32:14 +0100 | [diff] [blame] | 474 | if (write_queue_enqueue(&fw->msc_connection, msg) != 0) { |
Holger Hans Peter Freyther | 97f66e2 | 2010-07-28 03:32:52 +0800 | [diff] [blame] | 475 | LOGP(DMSC, LOGL_FATAL, "Failed to queue MSG for the MSC.\n"); |
| 476 | msgb_free(msg); |
| 477 | return; |
| 478 | } |
| 479 | } |
| 480 | |
Holger Hans Peter Freyther | 84ec871 | 2011-02-15 20:01:47 +0100 | [diff] [blame] | 481 | void msc_send_rlc(struct msc_connection *fw, |
Holger Hans Peter Freyther | 97f66e2 | 2010-07-28 03:32:52 +0800 | [diff] [blame] | 482 | struct sccp_source_reference *src, struct sccp_source_reference *dst) |
| 483 | { |
| 484 | struct msgb *msg; |
| 485 | |
Holger Hans Peter Freyther | e86c02e | 2011-02-10 15:32:14 +0100 | [diff] [blame] | 486 | if (fw->msc_link_down) { |
Holger Hans Peter Freyther | e250ac3 | 2011-01-21 12:50:02 +0100 | [diff] [blame] | 487 | LOGP(DMSC, LOGL_NOTICE, "Not releasing connection due lack of connection.\n"); |
| 488 | return; |
| 489 | } |
| 490 | |
Holger Hans Peter Freyther | 97f66e2 | 2010-07-28 03:32:52 +0800 | [diff] [blame] | 491 | msg = create_sccp_rlc(src, dst); |
| 492 | if (!msg) |
| 493 | return; |
| 494 | |
Holger Hans Peter Freyther | e86c02e | 2011-02-10 15:32:14 +0100 | [diff] [blame] | 495 | msc_send(fw, msg, IPAC_PROTO_SCCP); |
Holger Hans Peter Freyther | 97f66e2 | 2010-07-28 03:32:52 +0800 | [diff] [blame] | 496 | } |
| 497 | |
Holger Hans Peter Freyther | 84ec871 | 2011-02-15 20:01:47 +0100 | [diff] [blame] | 498 | void msc_send_reset(struct msc_connection *fw) |
Holger Hans Peter Freyther | 97f66e2 | 2010-07-28 03:32:52 +0800 | [diff] [blame] | 499 | { |
| 500 | struct msgb *msg; |
| 501 | |
Holger Hans Peter Freyther | e86c02e | 2011-02-10 15:32:14 +0100 | [diff] [blame] | 502 | if (fw->msc_link_down) { |
Holger Hans Peter Freyther | e250ac3 | 2011-01-21 12:50:02 +0100 | [diff] [blame] | 503 | LOGP(DMSC, LOGL_NOTICE, "Not sending reset due lack of connection.\n"); |
| 504 | return; |
| 505 | } |
| 506 | |
Holger Hans Peter Freyther | 97f66e2 | 2010-07-28 03:32:52 +0800 | [diff] [blame] | 507 | msg = create_reset(); |
| 508 | if (!msg) |
| 509 | return; |
| 510 | |
Holger Hans Peter Freyther | e86c02e | 2011-02-10 15:32:14 +0100 | [diff] [blame] | 511 | msc_send(fw, msg, IPAC_PROTO_SCCP); |
| 512 | msc_ping_timeout(fw); |
Holger Hans Peter Freyther | 97f66e2 | 2010-07-28 03:32:52 +0800 | [diff] [blame] | 513 | } |
| 514 | |
Holger Hans Peter Freyther | 84ec871 | 2011-02-15 20:01:47 +0100 | [diff] [blame] | 515 | static void msc_send_id_response(struct msc_connection *fw) |
Holger Hans Peter Freyther | 97f66e2 | 2010-07-28 03:32:52 +0800 | [diff] [blame] | 516 | { |
| 517 | struct msgb *msg; |
| 518 | |
| 519 | msg = msgb_alloc_headroom(4096, 128, "id resp"); |
| 520 | msg->l2h = msgb_v_put(msg, IPAC_MSGT_ID_RESP); |
Holger Hans Peter Freyther | e86c02e | 2011-02-10 15:32:14 +0100 | [diff] [blame] | 521 | msgb_l16tv_put(msg, strlen(fw->token) + 1, |
| 522 | IPAC_IDTAG_UNITNAME, (uint8_t *) fw->token); |
Holger Hans Peter Freyther | 97f66e2 | 2010-07-28 03:32:52 +0800 | [diff] [blame] | 523 | |
Holger Hans Peter Freyther | e86c02e | 2011-02-10 15:32:14 +0100 | [diff] [blame] | 524 | msc_send(fw, msg, IPAC_PROTO_IPACCESS); |
Holger Hans Peter Freyther | 97f66e2 | 2010-07-28 03:32:52 +0800 | [diff] [blame] | 525 | } |
| 526 | |
Holger Hans Peter Freyther | 84ec871 | 2011-02-15 20:01:47 +0100 | [diff] [blame] | 527 | void msc_send_direct(struct msc_connection *fw, struct msgb *msg) |
Holger Hans Peter Freyther | 594ee9a | 2010-11-16 11:03:19 +0100 | [diff] [blame] | 528 | { |
Holger Hans Peter Freyther | e86c02e | 2011-02-10 15:32:14 +0100 | [diff] [blame] | 529 | return msc_send(fw, msg, IPAC_PROTO_SCCP); |
Holger Hans Peter Freyther | 594ee9a | 2010-11-16 11:03:19 +0100 | [diff] [blame] | 530 | } |
| 531 | |
Holger Hans Peter Freyther | 84ec871 | 2011-02-15 20:01:47 +0100 | [diff] [blame] | 532 | struct msc_connection *msc_connection_create(struct bsc_data *bsc, int mgcp) |
| 533 | { |
| 534 | struct msc_connection *msc; |
| 535 | |
| 536 | msc = talloc_zero(NULL, struct msc_connection); |
| 537 | if (!msc) { |
| 538 | LOGP(DMSC, LOGL_ERROR, "Failed to allocate the MSC Connection.\n"); |
| 539 | return NULL; |
| 540 | } |
| 541 | |
| 542 | write_queue_init(&msc->msc_connection, 100); |
| 543 | msc->reconnect_timer.cb = msc_reconnect; |
| 544 | msc->reconnect_timer.data = msc; |
| 545 | msc->msc_connection.read_cb = ipaccess_a_fd_cb; |
| 546 | msc->msc_connection.write_cb = ipaccess_write_cb; |
| 547 | msc->msc_connection.bfd.data = msc; |
| 548 | msc->msc_link_down = 1; |
| 549 | |
| 550 | /* handle the timeout */ |
| 551 | msc->ping_timeout.cb = msc_ping_timeout; |
| 552 | msc->ping_timeout.data = msc; |
| 553 | msc->pong_timeout.cb = msc_pong_timeout; |
| 554 | msc->pong_timeout.data = msc; |
| 555 | |
| 556 | /* create MGCP port */ |
| 557 | if (mgcp && mgcp_create_port(msc) != 0) { |
| 558 | LOGP(DMSC, LOGL_ERROR, "Failed to bind for the MGCP port.\n"); |
| 559 | talloc_free(msc); |
| 560 | return NULL; |
| 561 | } |
| 562 | |
Holger Hans Peter Freyther | 84ec871 | 2011-02-15 20:01:47 +0100 | [diff] [blame] | 563 | llist_add(&msc->entry, &bsc->mscs); |
| 564 | msc->nr = bsc->num_mscs++; |
| 565 | |
| 566 | return msc; |
| 567 | } |
| 568 | |
| 569 | struct msc_connection *msc_connection_num(struct bsc_data *bsc, int num) |
| 570 | { |
| 571 | struct msc_connection *msc; |
| 572 | |
| 573 | llist_for_each_entry(msc, &bsc->mscs, entry) |
| 574 | if (msc->nr == num) |
| 575 | return msc; |
| 576 | return NULL; |
| 577 | } |
| 578 | |
| 579 | int msc_connection_start(struct msc_connection *msc) |
| 580 | { |
| 581 | if (msc->msc_connection.bfd.fd > 0) { |
| 582 | LOGP(DMSC, LOGL_ERROR, |
| 583 | "Function should not be called with active connection.\n"); |
| 584 | return -1; |
| 585 | } |
| 586 | |
| 587 | msc_schedule_reconnect(msc); |
| 588 | return 0; |
| 589 | } |