Holger Hans Peter Freyther | 98da544 | 2012-11-05 16:04:10 +0100 | [diff] [blame] | 1 | /* |
| 2 | * (C) 2011-2012 by Holger Hans Peter Freyther |
| 3 | * (C) 2011-2012 by On-Waves |
| 4 | * (C) 2011 by Daniel Willmann |
| 5 | * All Rights Reserved |
| 6 | * |
| 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 |
| 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 |
| 15 | * GNU Affero General Public License for more details. |
| 16 | * |
| 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/>. |
| 19 | * |
| 20 | */ |
| 21 | |
| 22 | #include <osmocom/core/talloc.h> |
| 23 | |
| 24 | #include <openbsc/control_cmd.h> |
| 25 | #include <openbsc/control_if.h> |
| 26 | |
| 27 | #include <openbsc/bsc_nat.h> |
| 28 | |
| 29 | #include <unistd.h> |
| 30 | |
| 31 | |
| 32 | #define NAT_MAX_CTRL_ID 65535 |
| 33 | |
| 34 | static struct bsc_nat *g_nat; |
| 35 | |
| 36 | static int bsc_id_unused(int id, struct bsc_connection *bsc) |
| 37 | { |
| 38 | struct bsc_cmd_list *pending; |
| 39 | |
| 40 | llist_for_each_entry(pending, &bsc->cmd_pending, list_entry) { |
| 41 | if (pending->nat_id == id) |
| 42 | return 0; |
| 43 | } |
| 44 | return 1; |
| 45 | } |
| 46 | |
| 47 | static int get_next_free_bsc_id(struct bsc_connection *bsc) |
| 48 | { |
| 49 | int new_id, overflow = 0; |
| 50 | |
| 51 | new_id = bsc->last_id; |
| 52 | |
| 53 | do { |
| 54 | new_id++; |
| 55 | if (new_id == NAT_MAX_CTRL_ID) { |
| 56 | new_id = 1; |
| 57 | overflow++; |
| 58 | } |
| 59 | |
| 60 | if (bsc_id_unused(new_id, bsc)) { |
| 61 | bsc->last_id = new_id; |
| 62 | return new_id; |
| 63 | } |
| 64 | } while (overflow != 2); |
| 65 | |
| 66 | return -1; |
| 67 | } |
| 68 | |
| 69 | void bsc_nat_ctrl_del_pending(struct bsc_cmd_list *pending) |
| 70 | { |
| 71 | llist_del(&pending->list_entry); |
| 72 | osmo_timer_del(&pending->timeout); |
| 73 | talloc_free(pending->cmd); |
| 74 | talloc_free(pending); |
| 75 | } |
| 76 | |
| 77 | static struct bsc_cmd_list *bsc_get_pending(struct bsc_connection *bsc, char *id_str) |
| 78 | { |
| 79 | struct bsc_cmd_list *cmd_entry; |
| 80 | int id = atoi(id_str); |
| 81 | if (id == 0) |
| 82 | return NULL; |
| 83 | |
| 84 | llist_for_each_entry(cmd_entry, &bsc->cmd_pending, list_entry) { |
| 85 | if (cmd_entry->nat_id == id) { |
| 86 | return cmd_entry; |
| 87 | } |
| 88 | } |
| 89 | return NULL; |
| 90 | } |
| 91 | |
| 92 | int bsc_nat_handle_ctrlif_msg(struct bsc_connection *bsc, struct msgb *msg) |
| 93 | { |
| 94 | struct ctrl_cmd *cmd; |
| 95 | struct bsc_cmd_list *pending; |
| 96 | char *var, *id; |
| 97 | |
| 98 | cmd = ctrl_cmd_parse(bsc, msg); |
| 99 | msgb_free(msg); |
| 100 | |
| 101 | if (!cmd) { |
| 102 | cmd = talloc_zero(bsc, struct ctrl_cmd); |
| 103 | if (!cmd) { |
| 104 | LOGP(DNAT, LOGL_ERROR, "OOM!\n"); |
| 105 | return -ENOMEM; |
| 106 | } |
| 107 | cmd->type = CTRL_TYPE_ERROR; |
| 108 | cmd->id = "err"; |
| 109 | cmd->reply = "Failed to parse command."; |
| 110 | goto err; |
| 111 | } |
| 112 | |
| 113 | if (bsc->cfg && !llist_empty(&bsc->cfg->lac_list)) { |
| 114 | if (cmd->variable) { |
| 115 | var = talloc_asprintf(cmd, "net.0.bsc.%i.%s", bsc->cfg->nr, |
| 116 | cmd->variable); |
| 117 | if (!var) { |
| 118 | cmd->type = CTRL_TYPE_ERROR; |
| 119 | cmd->reply = "OOM"; |
| 120 | goto err; |
| 121 | } |
| 122 | talloc_free(cmd->variable); |
| 123 | cmd->variable = var; |
| 124 | } |
| 125 | |
| 126 | /* We have to handle TRAPs before matching pending */ |
| 127 | if (cmd->type == CTRL_TYPE_TRAP) { |
| 128 | ctrl_cmd_send_to_all(bsc->nat->ctrl, cmd); |
| 129 | talloc_free(cmd); |
| 130 | return 0; |
| 131 | } |
| 132 | |
| 133 | /* Find the pending command */ |
| 134 | pending = bsc_get_pending(bsc, cmd->id); |
| 135 | if (pending) { |
| 136 | id = talloc_strdup(cmd, pending->cmd->id); |
| 137 | if (!id) { |
| 138 | cmd->type = CTRL_TYPE_ERROR; |
| 139 | cmd->reply = "OOM"; |
| 140 | goto err; |
| 141 | } |
| 142 | cmd->id = id; |
| 143 | ctrl_cmd_send(&pending->ccon->write_queue, cmd); |
| 144 | bsc_nat_ctrl_del_pending(pending); |
| 145 | } else { |
| 146 | /* We need to handle TRAPS here */ |
| 147 | if ((cmd->type != CTRL_TYPE_ERROR) && |
| 148 | (cmd->type != CTRL_TYPE_TRAP)) { |
| 149 | LOGP(DNAT, LOGL_NOTICE, "Got control message " |
| 150 | "from BSC without pending entry\n"); |
| 151 | cmd->type = CTRL_TYPE_ERROR; |
| 152 | cmd->reply = "No request outstanding"; |
| 153 | goto err; |
| 154 | } |
| 155 | } |
| 156 | } |
| 157 | talloc_free(cmd); |
| 158 | return 0; |
| 159 | err: |
| 160 | ctrl_cmd_send(&bsc->write_queue, cmd); |
| 161 | talloc_free(cmd); |
| 162 | return 0; |
| 163 | } |
| 164 | |
| 165 | static void pending_timeout_cb(void *data) |
| 166 | { |
| 167 | struct bsc_cmd_list *pending = data; |
| 168 | LOGP(DNAT, LOGL_ERROR, "Command timed out\n"); |
| 169 | pending->cmd->type = CTRL_TYPE_ERROR; |
| 170 | pending->cmd->reply = "Command timed out"; |
| 171 | ctrl_cmd_send(&pending->ccon->write_queue, pending->cmd); |
| 172 | |
| 173 | bsc_nat_ctrl_del_pending(pending); |
| 174 | } |
| 175 | |
| 176 | static void ctrl_conn_closed_cb(struct ctrl_connection *connection) |
| 177 | { |
| 178 | struct bsc_connection *bsc; |
| 179 | struct bsc_cmd_list *pending, *tmp; |
| 180 | |
| 181 | llist_for_each_entry(bsc, &g_nat->bsc_connections, list_entry) { |
| 182 | llist_for_each_entry_safe(pending, tmp, &bsc->cmd_pending, list_entry) { |
| 183 | if (pending->ccon == connection) |
| 184 | bsc_nat_ctrl_del_pending(pending); |
| 185 | } |
| 186 | } |
| 187 | } |
| 188 | |
| 189 | static int forward_to_bsc(struct ctrl_cmd *cmd) |
| 190 | { |
| 191 | int ret = CTRL_CMD_HANDLED; |
| 192 | struct ctrl_cmd *bsc_cmd = NULL; |
| 193 | struct bsc_connection *bsc; |
| 194 | struct bsc_cmd_list *pending; |
| 195 | unsigned int nr; |
Holger Hans Peter Freyther | b0b8a34 | 2013-07-05 07:45:08 +0200 | [diff] [blame] | 196 | char *nr_str, *tmp, *saveptr = NULL; |
Holger Hans Peter Freyther | 98da544 | 2012-11-05 16:04:10 +0100 | [diff] [blame] | 197 | |
| 198 | /* Skip over the beginning (bsc.) */ |
| 199 | tmp = strtok_r(cmd->variable, ".", &saveptr); |
| 200 | tmp = strtok_r(NULL, ".", &saveptr); |
| 201 | tmp = strtok_r(NULL, ".", &saveptr); |
| 202 | nr_str = strtok_r(NULL, ".", &saveptr); |
| 203 | if (!nr_str) { |
| 204 | cmd->reply = "command incomplete"; |
| 205 | goto err; |
| 206 | } |
| 207 | nr = atoi(nr_str); |
| 208 | |
| 209 | tmp = strtok_r(NULL, "\0", &saveptr); |
| 210 | if (!tmp) { |
| 211 | cmd->reply = "command incomplete"; |
| 212 | goto err; |
| 213 | } |
| 214 | |
| 215 | llist_for_each_entry(bsc, &g_nat->bsc_connections, list_entry) { |
| 216 | if (!bsc->cfg) |
| 217 | continue; |
| 218 | if (!bsc->authenticated) |
| 219 | continue; |
| 220 | if (bsc->cfg->nr == nr) { |
| 221 | /* Add pending command to list */ |
| 222 | pending = talloc_zero(bsc, struct bsc_cmd_list); |
| 223 | if (!pending) { |
| 224 | cmd->reply = "OOM"; |
| 225 | goto err; |
| 226 | } |
| 227 | |
| 228 | pending->nat_id = get_next_free_bsc_id(bsc); |
| 229 | if (pending->nat_id < 0) { |
| 230 | cmd->reply = "No free ID found"; |
| 231 | goto err; |
| 232 | } |
| 233 | |
| 234 | bsc_cmd = ctrl_cmd_cpy(bsc, cmd); |
| 235 | if (!bsc_cmd) { |
| 236 | cmd->reply = "Could not forward command"; |
| 237 | goto err; |
| 238 | } |
| 239 | |
| 240 | talloc_free(bsc_cmd->id); |
| 241 | bsc_cmd->id = talloc_asprintf(bsc_cmd, "%i", pending->nat_id); |
| 242 | if (!bsc_cmd->id) { |
| 243 | cmd->reply = "OOM"; |
| 244 | goto err; |
| 245 | } |
| 246 | |
| 247 | talloc_free(bsc_cmd->variable); |
| 248 | bsc_cmd->variable = talloc_strdup(bsc_cmd, tmp); |
| 249 | if (!bsc_cmd->variable) { |
| 250 | cmd->reply = "OOM"; |
| 251 | goto err; |
| 252 | } |
| 253 | |
| 254 | if (ctrl_cmd_send(&bsc->write_queue, bsc_cmd)) { |
| 255 | cmd->reply = "Sending failed"; |
| 256 | goto err; |
| 257 | } |
| 258 | pending->ccon = cmd->ccon; |
| 259 | pending->ccon->closed_cb = ctrl_conn_closed_cb; |
| 260 | pending->cmd = cmd; |
| 261 | |
| 262 | /* Setup the timeout */ |
| 263 | pending->timeout.data = pending; |
| 264 | pending->timeout.cb = pending_timeout_cb; |
| 265 | /* TODO: Make timeout configurable */ |
| 266 | osmo_timer_schedule(&pending->timeout, 10, 0); |
| 267 | llist_add_tail(&pending->list_entry, &bsc->cmd_pending); |
| 268 | |
| 269 | goto done; |
| 270 | } |
| 271 | } |
| 272 | /* We end up here if there's no bsc to handle our LAC */ |
| 273 | cmd->reply = "no BSC with this nr"; |
| 274 | err: |
| 275 | ret = CTRL_CMD_ERROR; |
| 276 | done: |
| 277 | if (bsc_cmd) |
| 278 | talloc_free(bsc_cmd); |
| 279 | return ret; |
| 280 | |
| 281 | } |
| 282 | |
| 283 | |
| 284 | CTRL_CMD_DEFINE(fwd_cmd, "net 0 bsc *"); |
| 285 | static int get_fwd_cmd(struct ctrl_cmd *cmd, void *data) |
| 286 | { |
| 287 | return forward_to_bsc(cmd); |
| 288 | } |
| 289 | |
| 290 | static int set_fwd_cmd(struct ctrl_cmd *cmd, void *data) |
| 291 | { |
| 292 | return forward_to_bsc(cmd); |
| 293 | } |
| 294 | |
| 295 | static int verify_fwd_cmd(struct ctrl_cmd *cmd, const char *value, void *data) |
| 296 | { |
| 297 | return 0; |
| 298 | } |
| 299 | |
| 300 | struct ctrl_handle *bsc_nat_controlif_setup(struct bsc_nat *nat, int port) |
| 301 | { |
| 302 | struct ctrl_handle *ctrl; |
| 303 | int rc; |
| 304 | |
| 305 | |
| 306 | ctrl = controlif_setup(NULL, 4250); |
| 307 | if (!ctrl) { |
| 308 | fprintf(stderr, "Failed to initialize the control interface. Exiting.\n"); |
| 309 | return NULL; |
| 310 | } |
| 311 | |
| 312 | rc = ctrl_cmd_install(CTRL_NODE_ROOT, &cmd_fwd_cmd); |
| 313 | if (rc) { |
| 314 | fprintf(stderr, "Failed to install the control command. Exiting.\n"); |
| 315 | osmo_fd_unregister(&ctrl->listen_fd); |
| 316 | close(ctrl->listen_fd.fd); |
| 317 | talloc_free(ctrl); |
| 318 | return NULL; |
| 319 | } |
| 320 | |
| 321 | g_nat = nat; |
| 322 | return ctrl; |
| 323 | } |
| 324 | |