Holger Hans Peter Freyther | b01b533 | 2010-06-30 14:29:53 +0800 | [diff] [blame] | 1 | /* RF Ctl handling socket */ |
| 2 | |
| 3 | /* (C) 2010 by Harald Welte <laforge@gnumonks.org> |
| 4 | * (C) 2010 by Holger Hans Peter Freyther <zecke@selfish.org> |
| 5 | * (C) 2010 by On-Waves |
| 6 | * All Rights Reserved |
| 7 | * |
| 8 | * This program is free software; you can redistribute it and/or modify |
| 9 | * it under the terms of the GNU General Public License as published by |
| 10 | * the Free Software Foundation; either version 2 of the License, or |
| 11 | * (at your option) any later version. |
| 12 | * |
| 13 | * This program is distributed in the hope that it will be useful, |
| 14 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 15 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 16 | * GNU General Public License for more details. |
| 17 | * |
| 18 | * You should have received a copy of the GNU General Public License along |
| 19 | * with this program; if not, write to the Free Software Foundation, Inc., |
| 20 | * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. |
| 21 | * |
| 22 | */ |
| 23 | |
| 24 | #include <openbsc/osmo_bsc_rf.h> |
| 25 | #include <openbsc/debug.h> |
| 26 | #include <openbsc/gsm_data.h> |
Holger Hans Peter Freyther | 9bf4cec | 2010-07-29 02:27:27 +0800 | [diff] [blame] | 27 | #include <openbsc/signal.h> |
Holger Hans Peter Freyther | d8bcaed | 2010-11-22 19:09:38 +0100 | [diff] [blame] | 28 | #include <openbsc/osmo_msc_data.h> |
Holger Hans Peter Freyther | b01b533 | 2010-06-30 14:29:53 +0800 | [diff] [blame] | 29 | |
| 30 | #include <osmocore/talloc.h> |
| 31 | #include <osmocore/protocol/gsm_12_21.h> |
| 32 | |
| 33 | #include <sys/socket.h> |
| 34 | #include <sys/un.h> |
| 35 | |
| 36 | #include <errno.h> |
| 37 | #include <unistd.h> |
| 38 | |
| 39 | #define RF_CMD_QUERY '?' |
| 40 | #define RF_CMD_OFF '0' |
| 41 | #define RF_CMD_ON '1' |
Holger Hans Peter Freyther | 77fdd3d | 2010-11-22 19:32:13 +0100 | [diff] [blame] | 42 | #define RF_CMD_D_OFF 'd' |
| 43 | #define RF_CMD_ON_G 'g' |
Holger Hans Peter Freyther | b01b533 | 2010-06-30 14:29:53 +0800 | [diff] [blame] | 44 | |
| 45 | static int lock_each_trx(struct gsm_network *net, int lock) |
| 46 | { |
| 47 | struct gsm_bts *bts; |
| 48 | |
| 49 | llist_for_each_entry(bts, &net->bts_list, list) { |
| 50 | struct gsm_bts_trx *trx; |
| 51 | llist_for_each_entry(trx, &bts->trx_list, list) { |
| 52 | gsm_trx_lock_rf(trx, lock); |
| 53 | } |
| 54 | } |
| 55 | |
| 56 | return 0; |
| 57 | } |
| 58 | |
Holger Hans Peter Freyther | 77fdd3d | 2010-11-22 19:32:13 +0100 | [diff] [blame] | 59 | static void send_resp(struct osmo_bsc_rf_conn *conn, char send) |
Holger Hans Peter Freyther | b01b533 | 2010-06-30 14:29:53 +0800 | [diff] [blame] | 60 | { |
| 61 | struct msgb *msg; |
Holger Hans Peter Freyther | b01b533 | 2010-06-30 14:29:53 +0800 | [diff] [blame] | 62 | |
| 63 | msg = msgb_alloc(10, "RF Query"); |
| 64 | if (!msg) { |
| 65 | LOGP(DINP, LOGL_ERROR, "Failed to allocate response msg.\n"); |
| 66 | return; |
| 67 | } |
| 68 | |
| 69 | msg->l2h = msgb_put(msg, 1); |
| 70 | msg->l2h[0] = send; |
| 71 | |
| 72 | if (write_queue_enqueue(&conn->queue, msg) != 0) { |
| 73 | LOGP(DINP, LOGL_ERROR, "Failed to enqueue the answer.\n"); |
| 74 | msgb_free(msg); |
| 75 | return; |
| 76 | } |
| 77 | |
| 78 | return; |
| 79 | } |
| 80 | |
Holger Hans Peter Freyther | 77fdd3d | 2010-11-22 19:32:13 +0100 | [diff] [blame] | 81 | |
| 82 | /* |
| 83 | * Send a |
| 84 | * 'g' when we are in grace mode |
| 85 | * '1' when one TRX is online, |
| 86 | * '0' otherwise |
| 87 | */ |
| 88 | static void handle_query(struct osmo_bsc_rf_conn *conn) |
| 89 | { |
| 90 | struct gsm_bts *bts; |
| 91 | char send = RF_CMD_OFF; |
| 92 | |
| 93 | if (conn->rf->policy == S_RF_GRACE) |
| 94 | return send_resp(conn, RF_CMD_ON_G); |
| 95 | |
| 96 | llist_for_each_entry(bts, &conn->rf->gsm_network->bts_list, list) { |
| 97 | struct gsm_bts_trx *trx; |
| 98 | llist_for_each_entry(trx, &bts->trx_list, list) { |
| 99 | if (trx->nm_state.availability == NM_AVSTATE_OK && |
| 100 | trx->nm_state.operational != NM_STATE_LOCKED) { |
| 101 | send = RF_CMD_ON; |
| 102 | break; |
| 103 | } |
| 104 | } |
| 105 | } |
| 106 | |
| 107 | send_resp(conn, send); |
| 108 | } |
| 109 | |
Holger Hans Peter Freyther | d8bcaed | 2010-11-22 19:09:38 +0100 | [diff] [blame] | 110 | static void send_signal(struct osmo_bsc_rf *rf, int val) |
Holger Hans Peter Freyther | 9bf4cec | 2010-07-29 02:27:27 +0800 | [diff] [blame] | 111 | { |
| 112 | struct rf_signal_data sig; |
Holger Hans Peter Freyther | d8bcaed | 2010-11-22 19:09:38 +0100 | [diff] [blame] | 113 | sig.net = rf->gsm_network; |
Holger Hans Peter Freyther | 9bf4cec | 2010-07-29 02:27:27 +0800 | [diff] [blame] | 114 | |
Holger Hans Peter Freyther | d8bcaed | 2010-11-22 19:09:38 +0100 | [diff] [blame] | 115 | rf->policy = val; |
Holger Hans Peter Freyther | 9bf4cec | 2010-07-29 02:27:27 +0800 | [diff] [blame] | 116 | dispatch_signal(SS_RF, val, &sig); |
| 117 | } |
| 118 | |
Holger Hans Peter Freyther | d8bcaed | 2010-11-22 19:09:38 +0100 | [diff] [blame] | 119 | static int switch_rf_off(struct osmo_bsc_rf *rf) |
| 120 | { |
| 121 | lock_each_trx(rf->gsm_network, 1); |
| 122 | send_signal(rf, S_RF_OFF); |
| 123 | |
| 124 | return 0; |
| 125 | } |
| 126 | |
| 127 | static void grace_timeout(void *_data) |
| 128 | { |
| 129 | struct osmo_bsc_rf *rf = (struct osmo_bsc_rf *) _data; |
| 130 | |
| 131 | LOGP(DINP, LOGL_NOTICE, "Grace timeout. Disabling the TRX.\n"); |
| 132 | switch_rf_off(rf); |
| 133 | } |
| 134 | |
| 135 | static int enter_grace(struct osmo_bsc_rf_conn *conn) |
| 136 | { |
| 137 | struct osmo_bsc_rf *rf = conn->rf; |
| 138 | |
| 139 | rf->grace_timeout.cb = grace_timeout; |
| 140 | rf->grace_timeout.data = rf; |
| 141 | bsc_schedule_timer(&rf->grace_timeout, rf->gsm_network->msc_data->mid_call_timeout, 0); |
| 142 | LOGP(DINP, LOGL_NOTICE, "Going to switch RF off in %d seconds.\n", |
| 143 | rf->gsm_network->msc_data->mid_call_timeout); |
| 144 | |
| 145 | send_signal(conn->rf, S_RF_GRACE); |
| 146 | return 0; |
| 147 | } |
| 148 | |
Holger Hans Peter Freyther | b01b533 | 2010-06-30 14:29:53 +0800 | [diff] [blame] | 149 | static int rf_read_cmd(struct bsc_fd *fd) |
| 150 | { |
| 151 | struct osmo_bsc_rf_conn *conn = fd->data; |
| 152 | char buf[1]; |
| 153 | int rc; |
| 154 | |
| 155 | rc = read(fd->fd, buf, sizeof(buf)); |
| 156 | if (rc != sizeof(buf)) { |
| 157 | LOGP(DINP, LOGL_ERROR, "Short read %d/%s\n", errno, strerror(errno)); |
| 158 | bsc_unregister_fd(fd); |
| 159 | close(fd->fd); |
| 160 | write_queue_clear(&conn->queue); |
| 161 | talloc_free(conn); |
| 162 | return -1; |
| 163 | } |
| 164 | |
| 165 | switch (buf[0]) { |
| 166 | case RF_CMD_QUERY: |
| 167 | handle_query(conn); |
| 168 | break; |
Holger Hans Peter Freyther | 77fdd3d | 2010-11-22 19:32:13 +0100 | [diff] [blame] | 169 | case RF_CMD_D_OFF: |
Holger Hans Peter Freyther | d8bcaed | 2010-11-22 19:09:38 +0100 | [diff] [blame] | 170 | bsc_del_timer(&conn->rf->grace_timeout); |
| 171 | switch_rf_off(conn->rf); |
Holger Hans Peter Freyther | b01b533 | 2010-06-30 14:29:53 +0800 | [diff] [blame] | 172 | break; |
| 173 | case RF_CMD_ON: |
Holger Hans Peter Freyther | d8bcaed | 2010-11-22 19:09:38 +0100 | [diff] [blame] | 174 | bsc_del_timer(&conn->rf->grace_timeout); |
Holger Hans Peter Freyther | db60d0a | 2010-09-16 00:10:18 +0800 | [diff] [blame] | 175 | lock_each_trx(conn->rf->gsm_network, 0); |
Holger Hans Peter Freyther | d8bcaed | 2010-11-22 19:09:38 +0100 | [diff] [blame] | 176 | send_signal(conn->rf, S_RF_ON); |
Holger Hans Peter Freyther | 9bf4cec | 2010-07-29 02:27:27 +0800 | [diff] [blame] | 177 | break; |
Holger Hans Peter Freyther | 77fdd3d | 2010-11-22 19:32:13 +0100 | [diff] [blame] | 178 | case RF_CMD_OFF: |
Holger Hans Peter Freyther | d8bcaed | 2010-11-22 19:09:38 +0100 | [diff] [blame] | 179 | enter_grace(conn); |
Holger Hans Peter Freyther | b01b533 | 2010-06-30 14:29:53 +0800 | [diff] [blame] | 180 | break; |
| 181 | default: |
| 182 | LOGP(DINP, LOGL_ERROR, "Unknown command %d\n", buf[0]); |
| 183 | break; |
| 184 | } |
| 185 | |
| 186 | return 0; |
| 187 | } |
| 188 | |
| 189 | static int rf_write_cmd(struct bsc_fd *fd, struct msgb *msg) |
| 190 | { |
| 191 | int rc; |
| 192 | |
| 193 | rc = write(fd->fd, msg->data, msg->len); |
| 194 | if (rc != msg->len) { |
| 195 | LOGP(DINP, LOGL_ERROR, "Short write %d/%s\n", errno, strerror(errno)); |
| 196 | return -1; |
| 197 | } |
| 198 | |
| 199 | return 0; |
| 200 | } |
| 201 | |
| 202 | static int rf_ctl_accept(struct bsc_fd *bfd, unsigned int what) |
| 203 | { |
| 204 | struct osmo_bsc_rf_conn *conn; |
| 205 | struct osmo_bsc_rf *rf = bfd->data; |
| 206 | struct sockaddr_un addr; |
| 207 | socklen_t len = sizeof(addr); |
| 208 | int fd; |
| 209 | |
| 210 | fd = accept(bfd->fd, (struct sockaddr *) &addr, &len); |
| 211 | if (fd < 0) { |
| 212 | LOGP(DINP, LOGL_ERROR, "Failed to accept. errno: %d/%s\n", |
| 213 | errno, strerror(errno)); |
| 214 | return -1; |
| 215 | } |
| 216 | |
| 217 | conn = talloc_zero(rf, struct osmo_bsc_rf_conn); |
| 218 | if (!conn) { |
| 219 | LOGP(DINP, LOGL_ERROR, "Failed to allocate mem.\n"); |
| 220 | close(fd); |
| 221 | return -1; |
| 222 | } |
| 223 | |
| 224 | write_queue_init(&conn->queue, 10); |
| 225 | conn->queue.bfd.data = conn; |
| 226 | conn->queue.bfd.fd = fd; |
| 227 | conn->queue.bfd.when = BSC_FD_READ | BSC_FD_WRITE; |
| 228 | conn->queue.read_cb = rf_read_cmd; |
| 229 | conn->queue.write_cb = rf_write_cmd; |
Holger Hans Peter Freyther | db60d0a | 2010-09-16 00:10:18 +0800 | [diff] [blame] | 230 | conn->rf = rf; |
Holger Hans Peter Freyther | b01b533 | 2010-06-30 14:29:53 +0800 | [diff] [blame] | 231 | |
| 232 | if (bsc_register_fd(&conn->queue.bfd) != 0) { |
| 233 | close(fd); |
| 234 | talloc_free(conn); |
| 235 | return -1; |
| 236 | } |
| 237 | |
| 238 | return 0; |
| 239 | } |
| 240 | |
| 241 | struct osmo_bsc_rf *osmo_bsc_rf_create(const char *path, struct gsm_network *net) |
| 242 | { |
| 243 | unsigned int namelen; |
| 244 | struct sockaddr_un local; |
| 245 | struct bsc_fd *bfd; |
| 246 | struct osmo_bsc_rf *rf; |
| 247 | int rc; |
| 248 | |
| 249 | rf = talloc_zero(NULL, struct osmo_bsc_rf); |
| 250 | if (!rf) { |
| 251 | LOGP(DINP, LOGL_ERROR, "Failed to create osmo_bsc_rf.\n"); |
| 252 | return NULL; |
| 253 | } |
| 254 | |
| 255 | bfd = &rf->listen; |
| 256 | bfd->fd = socket(AF_UNIX, SOCK_STREAM, 0); |
| 257 | if (bfd->fd < 0) { |
| 258 | LOGP(DINP, LOGL_ERROR, "Can not create socket. %d/%s\n", |
| 259 | errno, strerror(errno)); |
| 260 | return NULL; |
| 261 | } |
| 262 | |
| 263 | local.sun_family = AF_UNIX; |
| 264 | strncpy(local.sun_path, path, sizeof(local.sun_path)); |
| 265 | local.sun_path[sizeof(local.sun_path) - 1] = '\0'; |
| 266 | unlink(local.sun_path); |
| 267 | |
| 268 | /* we use the same magic that X11 uses in Xtranssock.c for |
| 269 | * calculating the proper length of the sockaddr */ |
| 270 | #if defined(BSD44SOCKETS) || defined(__UNIXWARE__) |
| 271 | local.sun_len = strlen(local.sun_path); |
| 272 | #endif |
| 273 | #if defined(BSD44SOCKETS) || defined(SUN_LEN) |
| 274 | namelen = SUN_LEN(&local); |
| 275 | #else |
| 276 | namelen = strlen(local.sun_path) + |
| 277 | offsetof(struct sockaddr_un, sun_path); |
| 278 | #endif |
| 279 | |
| 280 | rc = bind(bfd->fd, (struct sockaddr *) &local, namelen); |
| 281 | if (rc != 0) { |
| 282 | LOGP(DINP, LOGL_ERROR, "Failed to bind '%s' errno: %d/%s\n", |
| 283 | local.sun_path, errno, strerror(errno)); |
| 284 | close(bfd->fd); |
| 285 | talloc_free(rf); |
| 286 | return NULL; |
| 287 | } |
| 288 | |
| 289 | if (listen(bfd->fd, 0) != 0) { |
| 290 | LOGP(DINP, LOGL_ERROR, "Failed to listen: %d/%s\n", errno, strerror(errno)); |
| 291 | close(bfd->fd); |
| 292 | talloc_free(rf); |
| 293 | return NULL; |
| 294 | } |
| 295 | |
| 296 | bfd->when = BSC_FD_READ; |
| 297 | bfd->cb = rf_ctl_accept; |
| 298 | bfd->data = rf; |
| 299 | |
| 300 | if (bsc_register_fd(bfd) != 0) { |
| 301 | LOGP(DINP, LOGL_ERROR, "Failed to register bfd.\n"); |
| 302 | close(bfd->fd); |
| 303 | talloc_free(rf); |
| 304 | return NULL; |
| 305 | } |
| 306 | |
| 307 | rf->gsm_network = net; |
Holger Hans Peter Freyther | db60d0a | 2010-09-16 00:10:18 +0800 | [diff] [blame] | 308 | rf->policy = S_RF_ON; |
Holger Hans Peter Freyther | b01b533 | 2010-06-30 14:29:53 +0800 | [diff] [blame] | 309 | |
| 310 | return rf; |
| 311 | } |
| 312 | |