Neels Hofmeyr | 7299215 | 2020-09-19 02:36:08 +0200 | [diff] [blame] | 1 | /* |
| 2 | * (C) 2019 by sysmocom - s.m.f.c. GmbH <info@sysmocom.de> |
| 3 | * All Rights Reserved |
| 4 | * |
| 5 | * SPDX-License-Identifier: AGPL-3.0+ |
| 6 | * |
| 7 | * Author: Neels Hofmeyr |
| 8 | * |
| 9 | * This program is free software; you can redistribute it and/or modify |
| 10 | * it under the terms of the GNU Affero General Public License as published by |
| 11 | * the Free Software Foundation; either version 3 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 Affero General Public License for more details. |
| 18 | * |
| 19 | * You should have received a copy of the GNU Affero General Public License |
| 20 | * along with this program. If not, see <http://www.gnu.org/licenses/>. |
| 21 | */ |
| 22 | |
| 23 | #include <osmocom/core/linuxlist.h> |
| 24 | #include <osmocom/core/logging.h> |
| 25 | #include <osmocom/core/fsm.h> |
| 26 | #include <osmocom/gsm/bssmap_le.h> |
| 27 | #include <osmocom/sigtran/sccp_helpers.h> |
| 28 | |
| 29 | #include <osmocom/smlc/smlc_data.h> |
| 30 | #include <osmocom/smlc/sccp_lb_inst.h> |
| 31 | #include <osmocom/smlc/lb_peer.h> |
| 32 | |
| 33 | static struct osmo_fsm lb_peer_fsm; |
| 34 | |
| 35 | static __attribute__((constructor)) void lb_peer_init() |
| 36 | { |
| 37 | OSMO_ASSERT( osmo_fsm_register(&lb_peer_fsm) == 0); |
| 38 | } |
| 39 | |
| 40 | static struct lb_peer *lb_peer_alloc(struct sccp_lb_inst *sli, const struct osmo_sccp_addr *peer_addr) |
| 41 | { |
| 42 | struct lb_peer *lbp; |
| 43 | struct osmo_fsm_inst *fi; |
| 44 | |
| 45 | fi = osmo_fsm_inst_alloc(&lb_peer_fsm, sli, NULL, LOGL_DEBUG, NULL); |
| 46 | OSMO_ASSERT(fi); |
| 47 | |
| 48 | osmo_fsm_inst_update_id(fi, osmo_sccp_addr_to_id_c(OTC_SELECT, osmo_sccp_get_ss7(sli->sccp), peer_addr)); |
| 49 | |
| 50 | lbp = talloc_zero(fi, struct lb_peer); |
| 51 | OSMO_ASSERT(lbp); |
| 52 | *lbp = (struct lb_peer){ |
| 53 | .fi = fi, |
| 54 | .sli = sli, |
| 55 | .peer_addr = *peer_addr, |
| 56 | }; |
| 57 | fi->priv = lbp; |
| 58 | |
| 59 | llist_add(&lbp->entry, &sli->lb_peers); |
| 60 | |
| 61 | return lbp; |
| 62 | } |
| 63 | |
| 64 | struct lb_peer *lb_peer_find_or_create(struct sccp_lb_inst *sli, const struct osmo_sccp_addr *peer_addr) |
| 65 | { |
| 66 | struct lb_peer *lbp = lb_peer_find(sli, peer_addr); |
| 67 | if (lbp) |
| 68 | return lbp; |
| 69 | return lb_peer_alloc(sli, peer_addr); |
| 70 | } |
| 71 | |
| 72 | struct lb_peer *lb_peer_find(struct sccp_lb_inst *sli, const struct osmo_sccp_addr *peer_addr) |
| 73 | { |
| 74 | struct lb_peer *lbp; |
| 75 | llist_for_each_entry(lbp, &sli->lb_peers, entry) { |
| 76 | if (osmo_sccp_addr_ri_cmp(peer_addr, &lbp->peer_addr)) |
| 77 | continue; |
| 78 | return lbp; |
| 79 | } |
| 80 | return NULL; |
| 81 | } |
| 82 | |
| 83 | static const struct osmo_tdef_state_timeout lb_peer_fsm_timeouts[32] = { |
| 84 | [LB_PEER_ST_WAIT_RX_RESET_ACK] = { .T = -13 }, |
| 85 | [LB_PEER_ST_DISCARDING] = { .T = -14 }, |
| 86 | }; |
| 87 | |
| 88 | #define lb_peer_state_chg(LB_PEER, NEXT_STATE) \ |
| 89 | osmo_tdef_fsm_inst_state_chg((LB_PEER)->fi, NEXT_STATE, lb_peer_fsm_timeouts, g_smlc_tdefs, 5) |
| 90 | |
| 91 | void lb_peer_discard_all_conns(struct lb_peer *lbp) |
| 92 | { |
| 93 | struct lb_conn *lb_conn, *next; |
| 94 | |
| 95 | lb_peer_for_each_lb_conn_safe(lb_conn, next, lbp) { |
| 96 | lb_conn_discard(lb_conn); |
| 97 | } |
| 98 | } |
| 99 | |
| 100 | /* Drop all SCCP connections for this lb_peer, respond with RESET ACKNOWLEDGE and move to READY state. */ |
| 101 | static void lb_peer_rx_reset(struct lb_peer *lbp, struct msgb *msg) |
| 102 | { |
| 103 | struct msgb *resp; |
| 104 | struct bssap_le_pdu reset_ack = { |
| 105 | .discr = BSSAP_LE_MSG_DISCR_BSSMAP_LE, |
| 106 | .bssmap_le = { |
| 107 | .msg_type = BSSMAP_LE_MSGT_RESET_ACK, |
| 108 | }, |
| 109 | }; |
| 110 | |
| 111 | lb_peer_discard_all_conns(lbp); |
| 112 | |
| 113 | resp = osmo_bssap_le_enc(&reset_ack); |
| 114 | if (!resp) { |
| 115 | LOG_LB_PEER(lbp, LOGL_ERROR, "Failed to compose RESET ACKNOWLEDGE message\n"); |
| 116 | lb_peer_state_chg(lbp, LB_PEER_ST_WAIT_RX_RESET); |
| 117 | return; |
| 118 | } |
| 119 | |
| 120 | if (sccp_lb_down_l2_cl(lbp->sli, &lbp->peer_addr, resp)) { |
| 121 | LOG_LB_PEER(lbp, LOGL_ERROR, "Failed to send RESET ACKNOWLEDGE message\n"); |
| 122 | lb_peer_state_chg(lbp, LB_PEER_ST_WAIT_RX_RESET); |
| 123 | msgb_free(msg); |
| 124 | return; |
| 125 | } |
| 126 | |
| 127 | LOG_LB_PEER(lbp, LOGL_INFO, "Sent RESET ACKNOWLEDGE\n"); |
| 128 | |
| 129 | /* sccp_lb_down_l2_cl() doesn't free msgb */ |
| 130 | msgb_free(resp); |
| 131 | |
| 132 | lb_peer_state_chg(lbp, LB_PEER_ST_READY); |
| 133 | } |
| 134 | |
| 135 | static void lb_peer_rx_reset_ack(struct lb_peer *lbp, struct msgb* msg) |
| 136 | { |
| 137 | lb_peer_state_chg(lbp, LB_PEER_ST_READY); |
| 138 | } |
| 139 | |
| 140 | void lb_peer_reset(struct lb_peer *lbp) |
| 141 | { |
| 142 | struct bssap_le_pdu reset = { |
| 143 | .discr = BSSAP_LE_MSG_DISCR_BSSMAP_LE, |
| 144 | .bssmap_le = { |
| 145 | .msg_type = BSSMAP_LE_MSGT_RESET, |
| 146 | .reset = GSM0808_CAUSE_EQUIPMENT_FAILURE, |
| 147 | }, |
| 148 | }; |
| 149 | struct msgb *msg; |
| 150 | int rc; |
| 151 | |
| 152 | lb_peer_state_chg(lbp, LB_PEER_ST_WAIT_RX_RESET_ACK); |
| 153 | lb_peer_discard_all_conns(lbp); |
| 154 | |
| 155 | msg = osmo_bssap_le_enc(&reset); |
| 156 | if (!msg) { |
| 157 | LOG_LB_PEER(lbp, LOGL_ERROR, "Failed to compose RESET message\n"); |
| 158 | lb_peer_state_chg(lbp, LB_PEER_ST_WAIT_RX_RESET); |
| 159 | return; |
| 160 | } |
| 161 | |
| 162 | rc = sccp_lb_down_l2_cl(lbp->sli, &lbp->peer_addr, msg); |
| 163 | msgb_free(msg); |
| 164 | if (rc) { |
| 165 | LOG_LB_PEER(lbp, LOGL_ERROR, "Failed to send RESET message\n"); |
| 166 | lb_peer_state_chg(lbp, LB_PEER_ST_WAIT_RX_RESET); |
| 167 | } |
| 168 | } |
| 169 | |
| 170 | void lb_peer_allstate_action(struct osmo_fsm_inst *fi, uint32_t event, void *data) |
| 171 | { |
| 172 | struct lb_peer *lbp = fi->priv; |
| 173 | struct lb_peer_ev_ctx *ctx = data; |
| 174 | struct msgb *msg = ctx->msg; |
| 175 | enum bssmap_le_msgt msg_type; |
| 176 | |
| 177 | switch (event) { |
| 178 | case LB_PEER_EV_MSG_UP_CL: |
| 179 | msg_type = osmo_bssmap_le_msgt(msgb_l2(msg), msgb_l2len(msg)); |
| 180 | switch (msg_type) { |
| 181 | case BSSMAP_LE_MSGT_RESET: |
| 182 | osmo_fsm_inst_dispatch(fi, LB_PEER_EV_RX_RESET, msg); |
| 183 | return; |
| 184 | case BSSMAP_LE_MSGT_RESET_ACK: |
| 185 | osmo_fsm_inst_dispatch(fi, LB_PEER_EV_RX_RESET_ACK, msg); |
| 186 | return; |
| 187 | default: |
| 188 | LOG_LB_PEER(lbp, LOGL_ERROR, "Unhandled ConnectionLess message received: %s\n", |
| 189 | osmo_bssmap_le_msgt_name(msg_type)); |
| 190 | return; |
| 191 | } |
| 192 | |
| 193 | default: |
| 194 | LOG_LB_PEER(lbp, LOGL_ERROR, "Unhandled event: %s\n", osmo_fsm_event_name(&lb_peer_fsm, event)); |
| 195 | return; |
| 196 | } |
| 197 | } |
| 198 | |
| 199 | void lb_peer_st_wait_rx_reset(struct osmo_fsm_inst *fi, uint32_t event, void *data) |
| 200 | { |
| 201 | struct lb_peer *lbp = fi->priv; |
| 202 | struct lb_peer_ev_ctx *ctx; |
| 203 | struct msgb *msg; |
| 204 | |
| 205 | switch (event) { |
| 206 | |
| 207 | case LB_PEER_EV_MSG_UP_CO: |
| 208 | case LB_PEER_EV_MSG_UP_CO_INITIAL: |
| 209 | ctx = data; |
| 210 | OSMO_ASSERT(ctx); |
| 211 | LOG_LB_PEER(lbp, LOGL_ERROR, "Receiving CO message on Lb peer that has not done a proper RESET yet." |
| 212 | " Disconnecting on incoming message, sending RESET to Lb peer.\n"); |
| 213 | /* No valid RESET procedure has happened here yet. Usually, we're expecting the Lb peer (BSC, |
| 214 | * RNC) to first send a RESET message before sending Connection Oriented messages. So if we're |
| 215 | * getting a CO message, likely we've just restarted or something. Send a RESET to the peer. */ |
| 216 | |
| 217 | lb_peer_disconnect(lbp->sli, ctx->conn_id); |
| 218 | |
| 219 | lb_peer_reset(lbp); |
| 220 | return; |
| 221 | |
| 222 | case LB_PEER_EV_RX_RESET: |
| 223 | msg = (struct msgb*)data; |
| 224 | lb_peer_rx_reset(lbp, msg); |
| 225 | return; |
| 226 | |
| 227 | default: |
| 228 | LOG_LB_PEER(lbp, LOGL_ERROR, "Unhandled event: %s\n", osmo_fsm_event_name(&lb_peer_fsm, event)); |
| 229 | return; |
| 230 | } |
| 231 | } |
| 232 | |
| 233 | void lb_peer_st_wait_rx_reset_ack(struct osmo_fsm_inst *fi, uint32_t event, void *data) |
| 234 | { |
| 235 | struct lb_peer *lbp = fi->priv; |
| 236 | struct lb_peer_ev_ctx *ctx; |
| 237 | struct msgb *msg; |
| 238 | |
| 239 | switch (event) { |
| 240 | |
| 241 | case LB_PEER_EV_RX_RESET_ACK: |
| 242 | msg = (struct msgb*)data; |
| 243 | lb_peer_rx_reset_ack(lbp, msg); |
| 244 | return; |
| 245 | |
| 246 | case LB_PEER_EV_MSG_UP_CO: |
| 247 | case LB_PEER_EV_MSG_UP_CO_INITIAL: |
| 248 | ctx = data; |
| 249 | OSMO_ASSERT(ctx); |
| 250 | LOG_LB_PEER(lbp, LOGL_ERROR, "Receiving CO message on Lb peer that has not done a proper RESET yet." |
| 251 | " Disconnecting on incoming message, sending RESET to Lb peer.\n"); |
| 252 | sccp_lb_disconnect(lbp->sli, ctx->conn_id, 0); |
| 253 | /* No valid RESET procedure has happened here yet. */ |
| 254 | lb_peer_reset(lbp); |
| 255 | return; |
| 256 | |
| 257 | case LB_PEER_EV_RX_RESET: |
| 258 | msg = (struct msgb*)data; |
| 259 | lb_peer_rx_reset(lbp, msg); |
| 260 | return; |
| 261 | |
| 262 | default: |
| 263 | LOG_LB_PEER(lbp, LOGL_ERROR, "Unhandled event: %s\n", osmo_fsm_event_name(&lb_peer_fsm, event)); |
| 264 | return; |
| 265 | } |
| 266 | } |
| 267 | |
| 268 | void lb_peer_st_ready(struct osmo_fsm_inst *fi, uint32_t event, void *data) |
| 269 | { |
| 270 | struct lb_peer *lbp = fi->priv; |
| 271 | struct lb_peer_ev_ctx *ctx; |
| 272 | struct lb_conn *lb_conn; |
| 273 | struct msgb *msg; |
| 274 | |
| 275 | switch (event) { |
| 276 | |
| 277 | case LB_PEER_EV_MSG_UP_CO_INITIAL: |
| 278 | ctx = data; |
| 279 | OSMO_ASSERT(ctx); |
| 280 | OSMO_ASSERT(!ctx->lb_conn); |
| 281 | OSMO_ASSERT(ctx->msg); |
| 282 | |
| 283 | lb_conn = lb_conn_create_incoming(lbp, ctx->conn_id, __func__); |
| 284 | if (!lb_conn) { |
| 285 | LOG_LB_PEER(lbp, LOGL_ERROR, "Cannot allocate lb_conn\n"); |
| 286 | return; |
| 287 | } |
| 288 | |
| 289 | lb_conn_rx(lb_conn, ctx->msg, true); |
| 290 | lb_conn_put(lb_conn, __func__); |
| 291 | return; |
| 292 | |
| 293 | case LB_PEER_EV_MSG_UP_CO: |
| 294 | ctx = data; |
| 295 | OSMO_ASSERT(ctx); |
| 296 | OSMO_ASSERT(ctx->lb_conn); |
| 297 | OSMO_ASSERT(ctx->msg); |
| 298 | |
| 299 | lb_conn_rx(ctx->lb_conn, ctx->msg, false); |
| 300 | return; |
| 301 | |
| 302 | case LB_PEER_EV_MSG_DOWN_CO_INITIAL: |
| 303 | ctx = data; |
| 304 | OSMO_ASSERT(ctx); |
| 305 | OSMO_ASSERT(ctx->msg); |
| 306 | sccp_lb_down_l2_co_initial(lbp->sli, &lbp->peer_addr, ctx->conn_id, ctx->msg); |
| 307 | return; |
| 308 | |
| 309 | case LB_PEER_EV_MSG_DOWN_CO: |
| 310 | ctx = data; |
| 311 | OSMO_ASSERT(ctx); |
| 312 | OSMO_ASSERT(ctx->msg); |
| 313 | sccp_lb_down_l2_co(lbp->sli, ctx->conn_id, ctx->msg); |
| 314 | return; |
| 315 | |
| 316 | case LB_PEER_EV_MSG_DOWN_CL: |
| 317 | OSMO_ASSERT(data); |
| 318 | sccp_lb_down_l2_cl(lbp->sli, &lbp->peer_addr, (struct msgb*)data); |
| 319 | return; |
| 320 | |
| 321 | case LB_PEER_EV_RX_RESET: |
| 322 | msg = (struct msgb*)data; |
| 323 | lb_peer_rx_reset(lbp, msg); |
| 324 | return; |
| 325 | |
| 326 | default: |
| 327 | LOG_LB_PEER(lbp, LOGL_ERROR, "Unhandled event: %s\n", osmo_fsm_event_name(&lb_peer_fsm, event)); |
| 328 | return; |
| 329 | } |
| 330 | } |
| 331 | |
| 332 | static int lb_peer_fsm_timer_cb(struct osmo_fsm_inst *fi) |
| 333 | { |
| 334 | struct lb_peer *lbp = fi->priv; |
| 335 | lb_peer_state_chg(lbp, LB_PEER_ST_WAIT_RX_RESET); |
| 336 | return 0; |
| 337 | } |
| 338 | |
| 339 | void lb_peer_fsm_cleanup(struct osmo_fsm_inst *fi, enum osmo_fsm_term_cause cause) |
| 340 | { |
| 341 | struct lb_peer *lbp = fi->priv; |
| 342 | lb_peer_discard_all_conns(lbp); |
| 343 | llist_del(&lbp->entry); |
| 344 | } |
| 345 | |
| 346 | static const struct value_string lb_peer_fsm_event_names[] = { |
| 347 | OSMO_VALUE_STRING(LB_PEER_EV_MSG_UP_CL), |
| 348 | OSMO_VALUE_STRING(LB_PEER_EV_MSG_UP_CO_INITIAL), |
| 349 | OSMO_VALUE_STRING(LB_PEER_EV_MSG_UP_CO), |
| 350 | OSMO_VALUE_STRING(LB_PEER_EV_MSG_DOWN_CL), |
| 351 | OSMO_VALUE_STRING(LB_PEER_EV_MSG_DOWN_CO_INITIAL), |
| 352 | OSMO_VALUE_STRING(LB_PEER_EV_MSG_DOWN_CO), |
| 353 | OSMO_VALUE_STRING(LB_PEER_EV_RX_RESET), |
| 354 | OSMO_VALUE_STRING(LB_PEER_EV_RX_RESET_ACK), |
| 355 | OSMO_VALUE_STRING(LB_PEER_EV_CONNECTION_SUCCESS), |
| 356 | OSMO_VALUE_STRING(LB_PEER_EV_CONNECTION_TIMEOUT), |
| 357 | {} |
| 358 | }; |
| 359 | |
| 360 | #define S(x) (1 << (x)) |
| 361 | |
| 362 | static const struct osmo_fsm_state lb_peer_fsm_states[] = { |
| 363 | [LB_PEER_ST_WAIT_RX_RESET] = { |
| 364 | .name = "WAIT_RX_RESET", |
| 365 | .action = lb_peer_st_wait_rx_reset, |
| 366 | .in_event_mask = 0 |
| 367 | | S(LB_PEER_EV_RX_RESET) |
| 368 | | S(LB_PEER_EV_MSG_UP_CO_INITIAL) |
| 369 | | S(LB_PEER_EV_MSG_UP_CO) |
| 370 | | S(LB_PEER_EV_CONNECTION_TIMEOUT) |
| 371 | , |
| 372 | .out_state_mask = 0 |
| 373 | | S(LB_PEER_ST_WAIT_RX_RESET) |
| 374 | | S(LB_PEER_ST_WAIT_RX_RESET_ACK) |
| 375 | | S(LB_PEER_ST_READY) |
| 376 | | S(LB_PEER_ST_DISCARDING) |
| 377 | , |
| 378 | }, |
| 379 | [LB_PEER_ST_WAIT_RX_RESET_ACK] = { |
| 380 | .name = "WAIT_RX_RESET_ACK", |
| 381 | .action = lb_peer_st_wait_rx_reset_ack, |
| 382 | .in_event_mask = 0 |
| 383 | | S(LB_PEER_EV_RX_RESET) |
| 384 | | S(LB_PEER_EV_RX_RESET_ACK) |
| 385 | | S(LB_PEER_EV_MSG_UP_CO_INITIAL) |
| 386 | | S(LB_PEER_EV_MSG_UP_CO) |
| 387 | | S(LB_PEER_EV_CONNECTION_TIMEOUT) |
| 388 | , |
| 389 | .out_state_mask = 0 |
| 390 | | S(LB_PEER_ST_WAIT_RX_RESET) |
| 391 | | S(LB_PEER_ST_WAIT_RX_RESET_ACK) |
| 392 | | S(LB_PEER_ST_READY) |
| 393 | | S(LB_PEER_ST_DISCARDING) |
| 394 | , |
| 395 | }, |
| 396 | [LB_PEER_ST_READY] = { |
| 397 | .name = "READY", |
| 398 | .action = lb_peer_st_ready, |
| 399 | .in_event_mask = 0 |
| 400 | | S(LB_PEER_EV_RX_RESET) |
| 401 | | S(LB_PEER_EV_MSG_UP_CO_INITIAL) |
| 402 | | S(LB_PEER_EV_MSG_UP_CO) |
| 403 | | S(LB_PEER_EV_MSG_DOWN_CO_INITIAL) |
| 404 | | S(LB_PEER_EV_MSG_DOWN_CO) |
| 405 | | S(LB_PEER_EV_MSG_DOWN_CL) |
| 406 | , |
| 407 | .out_state_mask = 0 |
| 408 | | S(LB_PEER_ST_WAIT_RX_RESET) |
| 409 | | S(LB_PEER_ST_WAIT_RX_RESET_ACK) |
| 410 | | S(LB_PEER_ST_READY) |
| 411 | | S(LB_PEER_ST_DISCARDING) |
| 412 | , |
| 413 | }, |
| 414 | [LB_PEER_ST_DISCARDING] = { |
| 415 | .name = "DISCARDING", |
| 416 | }, |
| 417 | }; |
| 418 | |
| 419 | static struct osmo_fsm lb_peer_fsm = { |
| 420 | .name = "lb_peer", |
| 421 | .states = lb_peer_fsm_states, |
| 422 | .num_states = ARRAY_SIZE(lb_peer_fsm_states), |
| 423 | .log_subsys = DLB, |
| 424 | .event_names = lb_peer_fsm_event_names, |
| 425 | .timer_cb = lb_peer_fsm_timer_cb, |
| 426 | .cleanup = lb_peer_fsm_cleanup, |
| 427 | .allstate_action = lb_peer_allstate_action, |
| 428 | .allstate_event_mask = 0 |
| 429 | | S(LB_PEER_EV_MSG_UP_CL) |
| 430 | , |
| 431 | }; |
| 432 | |
| 433 | int lb_peer_up_l2(struct sccp_lb_inst *sli, const struct osmo_sccp_addr *calling_addr, bool co, uint32_t conn_id, |
| 434 | struct msgb *l2) |
| 435 | { |
| 436 | struct lb_peer *lb_peer = NULL; |
| 437 | uint32_t event; |
| 438 | struct lb_peer_ev_ctx ctx = { |
| 439 | .conn_id = conn_id, |
| 440 | .msg = l2, |
| 441 | }; |
| 442 | |
| 443 | if (co) { |
| 444 | struct lb_conn *lb_conn; |
| 445 | llist_for_each_entry(lb_conn, &sli->lb_conns, entry) { |
| 446 | if (lb_conn->sccp_conn_id == conn_id) { |
| 447 | lb_peer = lb_conn->lb_peer; |
| 448 | ctx.lb_conn = lb_conn; |
| 449 | break; |
| 450 | } |
| 451 | } |
| 452 | |
| 453 | if (lb_peer && calling_addr) { |
| 454 | LOG_SCCP_LB_CO(sli, calling_addr, conn_id, LOGL_ERROR, |
| 455 | "Connection-Oriented Initial message for already existing conn_id." |
| 456 | " Dropping message.\n"); |
| 457 | return -EINVAL; |
| 458 | } |
| 459 | |
| 460 | if (!lb_peer && !calling_addr) { |
| 461 | LOG_SCCP_LB_CO(sli, calling_addr, conn_id, LOGL_ERROR, |
| 462 | "Connection-Oriented non-Initial message for unknown conn_id %u." |
| 463 | " Dropping message.\n", conn_id); |
| 464 | return -EINVAL; |
| 465 | } |
| 466 | } |
| 467 | |
| 468 | if (calling_addr) { |
| 469 | lb_peer = lb_peer_find_or_create(sli, calling_addr); |
| 470 | if (!lb_peer) { |
| 471 | LOG_SCCP_LB_CL(sli, calling_addr, LOGL_ERROR, "Cannot register Lb peer\n"); |
| 472 | return -EIO; |
| 473 | } |
| 474 | } |
| 475 | |
| 476 | OSMO_ASSERT(lb_peer && lb_peer->fi); |
| 477 | |
| 478 | if (co) |
| 479 | event = calling_addr ? LB_PEER_EV_MSG_UP_CO_INITIAL : LB_PEER_EV_MSG_UP_CO; |
| 480 | else |
| 481 | event = LB_PEER_EV_MSG_UP_CL; |
| 482 | |
| 483 | return osmo_fsm_inst_dispatch(lb_peer->fi, event, &ctx); |
| 484 | } |
| 485 | |
| 486 | void lb_peer_disconnect(struct sccp_lb_inst *sli, uint32_t conn_id) |
| 487 | { |
| 488 | struct lb_conn *lb_conn; |
| 489 | llist_for_each_entry(lb_conn, &sli->lb_conns, entry) { |
| 490 | if (lb_conn->sccp_conn_id == conn_id) { |
| 491 | lb_conn_discard(lb_conn); |
| 492 | return; |
| 493 | } |
| 494 | } |
| 495 | } |