Neels Hofmeyr | c4628a3 | 2018-12-07 14:47:34 +0100 | [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/sigtran/sccp_helpers.h> |
| 27 | |
| 28 | #include <osmocom/msc/ran_peer.h> |
| 29 | #include <osmocom/msc/sccp_ran.h> |
| 30 | #include <osmocom/msc/msub.h> |
| 31 | #include <osmocom/msc/msc_i.h> |
| 32 | #include <osmocom/msc/msc_a.h> |
| 33 | #include <osmocom/msc/vlr.h> |
| 34 | #include <osmocom/msc/ran_conn.h> |
| 35 | #include <osmocom/msc/cell_id_list.h> |
| 36 | |
| 37 | static struct osmo_fsm ran_peer_fsm; |
| 38 | |
| 39 | static __attribute__((constructor)) void ran_peer_init() |
| 40 | { |
| 41 | OSMO_ASSERT( osmo_fsm_register(&ran_peer_fsm) == 0); |
| 42 | } |
| 43 | |
| 44 | /* Allocate a RAN peer with FSM instance. To deallocate, call osmo_fsm_inst_term(ran_peer->fi). */ |
| 45 | static struct ran_peer *ran_peer_alloc(struct sccp_ran_inst *sri, const struct osmo_sccp_addr *peer_addr) |
| 46 | { |
| 47 | struct ran_peer *rp; |
| 48 | struct osmo_fsm_inst *fi; |
| 49 | char *sccp_addr; |
| 50 | char *pos; |
| 51 | |
| 52 | fi = osmo_fsm_inst_alloc(&ran_peer_fsm, sri, NULL, LOGL_DEBUG, NULL); |
| 53 | OSMO_ASSERT(fi); |
| 54 | |
| 55 | /* Unfortunately, osmo_sccp_inst_addr_name() returns "RI=SSN_PC,PC=0.24.1,SSN=BSSAP" but neither commas nor |
| 56 | * full-stops are allowed as FSM inst id. Make it "RI=SSN_PC:PC-0-24-1:SSN-BSSAP". */ |
| 57 | sccp_addr = osmo_sccp_inst_addr_name(sri->sccp, peer_addr); |
| 58 | for (pos = sccp_addr; *pos; pos++) { |
| 59 | if (*pos == ',') |
| 60 | *pos = ':'; |
| 61 | else if (*pos == '.' || *pos == '=') |
| 62 | *pos = '-'; |
| 63 | } |
| 64 | osmo_fsm_inst_update_id_f(fi, "%s:%s", osmo_rat_type_name(sri->ran->type), sccp_addr); |
| 65 | |
| 66 | rp = talloc_zero(fi, struct ran_peer); |
| 67 | OSMO_ASSERT(rp); |
| 68 | *rp = (struct ran_peer){ |
| 69 | .sri = sri, |
| 70 | .peer_addr = *peer_addr, |
| 71 | .fi = fi, |
| 72 | }; |
| 73 | INIT_LLIST_HEAD(&rp->cells_seen); |
| 74 | fi->priv = rp; |
| 75 | |
| 76 | llist_add(&rp->entry, &sri->ran_peers); |
| 77 | |
| 78 | return rp; |
| 79 | } |
| 80 | |
| 81 | struct ran_peer *ran_peer_find_or_create(struct sccp_ran_inst *sri, const struct osmo_sccp_addr *peer_addr) |
| 82 | { |
Neels Hofmeyr | cbcfe99 | 2020-09-23 01:32:11 +0200 | [diff] [blame] | 83 | struct ran_peer *rp = ran_peer_find_by_addr(sri, peer_addr); |
Neels Hofmeyr | c4628a3 | 2018-12-07 14:47:34 +0100 | [diff] [blame] | 84 | if (rp) |
| 85 | return rp; |
| 86 | return ran_peer_alloc(sri, peer_addr); |
| 87 | } |
| 88 | |
Neels Hofmeyr | cbcfe99 | 2020-09-23 01:32:11 +0200 | [diff] [blame] | 89 | struct ran_peer *ran_peer_find_by_addr(struct sccp_ran_inst *sri, const struct osmo_sccp_addr *peer_addr) |
Neels Hofmeyr | c4628a3 | 2018-12-07 14:47:34 +0100 | [diff] [blame] | 90 | { |
| 91 | struct ran_peer *rp; |
| 92 | llist_for_each_entry(rp, &sri->ran_peers, entry) { |
| 93 | if (osmo_sccp_addr_ri_cmp(peer_addr, &rp->peer_addr)) |
| 94 | continue; |
| 95 | return rp; |
| 96 | } |
| 97 | return NULL; |
| 98 | } |
| 99 | |
| 100 | void ran_peer_cells_seen_add(struct ran_peer *ran_peer, const struct gsm0808_cell_id *cid) |
| 101 | { |
| 102 | if (!cell_id_list_add_cell(ran_peer, &ran_peer->cells_seen, cid)) |
| 103 | return; |
| 104 | LOG_RAN_PEER_CAT(ran_peer, DPAG, LOGL_NOTICE, "Added seen cell to this RAN peer: %s\n", |
| 105 | gsm0808_cell_id_name(cid)); |
| 106 | } |
| 107 | |
| 108 | static const struct osmo_tdef_state_timeout ran_peer_fsm_timeouts[32] = { |
| 109 | [RAN_PEER_ST_WAIT_RX_RESET_ACK] = { .T = -1 }, |
| 110 | [RAN_PEER_ST_DISCARDING] = { .T = -2 }, |
| 111 | }; |
| 112 | |
| 113 | #define ran_peer_state_chg(RAN_PEER, NEXT_STATE) \ |
| 114 | osmo_tdef_fsm_inst_state_chg((RAN_PEER)->fi, NEXT_STATE, ran_peer_fsm_timeouts, g_sccp_tdefs, 5) |
| 115 | |
| 116 | void ran_peer_discard_all_conns(struct ran_peer *rp) |
| 117 | { |
| 118 | struct ran_conn *conn, *next; |
| 119 | |
| 120 | ran_peer_for_each_ran_conn_safe(conn, next, rp) { |
| 121 | ran_conn_discard(conn); |
| 122 | } |
| 123 | } |
| 124 | |
Neels Hofmeyr | b697274 | 2020-06-26 15:20:51 +0200 | [diff] [blame] | 125 | static void ran_peer_update_osmux_support(struct ran_peer *rp, int supports_osmux) |
Pau Espin Pedrol | f9f38b5 | 2019-05-07 11:48:16 +0200 | [diff] [blame] | 126 | { |
Pau Espin Pedrol | f9f38b5 | 2019-05-07 11:48:16 +0200 | [diff] [blame] | 127 | bool old_value = rp->remote_supports_osmux; |
| 128 | |
Neels Hofmeyr | b697274 | 2020-06-26 15:20:51 +0200 | [diff] [blame] | 129 | switch (supports_osmux) { |
| 130 | case 1: |
Pau Espin Pedrol | f9f38b5 | 2019-05-07 11:48:16 +0200 | [diff] [blame] | 131 | rp->remote_supports_osmux = true; |
Neels Hofmeyr | b697274 | 2020-06-26 15:20:51 +0200 | [diff] [blame] | 132 | break; |
| 133 | case -1: |
Pau Espin Pedrol | f9f38b5 | 2019-05-07 11:48:16 +0200 | [diff] [blame] | 134 | rp->remote_supports_osmux = false; |
Neels Hofmeyr | b697274 | 2020-06-26 15:20:51 +0200 | [diff] [blame] | 135 | break; |
| 136 | default: |
| 137 | return; |
Pau Espin Pedrol | f9f38b5 | 2019-05-07 11:48:16 +0200 | [diff] [blame] | 138 | } |
| 139 | |
| 140 | if (old_value != rp->remote_supports_osmux) |
| 141 | LOG_RAN_PEER(rp, LOGL_INFO, "BSC detected AoIP Osmux support changed: %d->%d\n", |
| 142 | old_value, rp->remote_supports_osmux); |
| 143 | } |
| 144 | |
Neels Hofmeyr | c4628a3 | 2018-12-07 14:47:34 +0100 | [diff] [blame] | 145 | /* Drop all SCCP connections for this ran_peer, respond with RESET ACKNOWLEDGE and move to READY state. */ |
Pau Espin Pedrol | f9f38b5 | 2019-05-07 11:48:16 +0200 | [diff] [blame] | 146 | static void ran_peer_rx_reset(struct ran_peer *rp, struct msgb* msg) |
Neels Hofmeyr | c4628a3 | 2018-12-07 14:47:34 +0100 | [diff] [blame] | 147 | { |
| 148 | struct msgb *reset_ack; |
| 149 | |
| 150 | ran_peer_discard_all_conns(rp); |
| 151 | |
| 152 | reset_ack = rp->sri->ran->sccp_ran_ops.make_reset_msg(rp->sri, SCCP_RAN_MSG_RESET_ACK); |
| 153 | |
| 154 | if (!reset_ack) { |
| 155 | LOG_RAN_PEER(rp, LOGL_ERROR, "Failed to compose RESET ACKNOWLEDGE message\n"); |
| 156 | ran_peer_state_chg(rp, RAN_PEER_ST_WAIT_RX_RESET); |
| 157 | return; |
| 158 | } |
| 159 | |
| 160 | if (sccp_ran_down_l2_cl(rp->sri, &rp->peer_addr, reset_ack)) { |
| 161 | LOG_RAN_PEER(rp, LOGL_ERROR, "Failed to send RESET ACKNOWLEDGE message\n"); |
| 162 | ran_peer_state_chg(rp, RAN_PEER_ST_WAIT_RX_RESET); |
Vadim Yanitskiy | 53d3e0e | 2019-05-10 02:44:57 +0700 | [diff] [blame] | 163 | msgb_free(reset_ack); |
Neels Hofmeyr | c4628a3 | 2018-12-07 14:47:34 +0100 | [diff] [blame] | 164 | return; |
| 165 | } |
| 166 | |
| 167 | LOG_RAN_PEER(rp, LOGL_INFO, "Sent RESET ACKNOWLEDGE\n"); |
| 168 | |
Vadim Yanitskiy | 53d3e0e | 2019-05-10 02:44:57 +0700 | [diff] [blame] | 169 | /* sccp_ran_down_l2_cl() doesn't free msgb */ |
| 170 | msgb_free(reset_ack); |
| 171 | |
Neels Hofmeyr | c4628a3 | 2018-12-07 14:47:34 +0100 | [diff] [blame] | 172 | ran_peer_state_chg(rp, RAN_PEER_ST_READY); |
| 173 | } |
| 174 | |
Pau Espin Pedrol | f9f38b5 | 2019-05-07 11:48:16 +0200 | [diff] [blame] | 175 | static void ran_peer_rx_reset_ack(struct ran_peer *rp, struct msgb* msg) |
Pau Espin Pedrol | f15852b | 2019-05-13 19:54:02 +0200 | [diff] [blame] | 176 | { |
| 177 | ran_peer_state_chg(rp, RAN_PEER_ST_READY); |
| 178 | } |
| 179 | |
Neels Hofmeyr | c4628a3 | 2018-12-07 14:47:34 +0100 | [diff] [blame] | 180 | void ran_peer_reset(struct ran_peer *rp) |
| 181 | { |
| 182 | struct msgb *reset; |
| 183 | |
| 184 | ran_peer_state_chg(rp, RAN_PEER_ST_WAIT_RX_RESET_ACK); |
| 185 | ran_peer_discard_all_conns(rp); |
| 186 | |
| 187 | reset = rp->sri->ran->sccp_ran_ops.make_reset_msg(rp->sri, SCCP_RAN_MSG_RESET); |
| 188 | |
| 189 | if (!reset) { |
| 190 | LOG_RAN_PEER(rp, LOGL_ERROR, "Failed to compose RESET message\n"); |
| 191 | ran_peer_state_chg(rp, RAN_PEER_ST_WAIT_RX_RESET); |
| 192 | return; |
| 193 | } |
| 194 | |
| 195 | if (sccp_ran_down_l2_cl(rp->sri, &rp->peer_addr, reset)) { |
| 196 | LOG_RAN_PEER(rp, LOGL_ERROR, "Failed to send RESET message\n"); |
| 197 | ran_peer_state_chg(rp, RAN_PEER_ST_WAIT_RX_RESET); |
| 198 | return; |
| 199 | } |
| 200 | } |
| 201 | |
| 202 | void ran_peer_allstate_action(struct osmo_fsm_inst *fi, uint32_t event, void *data) |
| 203 | { |
| 204 | struct ran_peer *rp = fi->priv; |
| 205 | struct ran_peer_ev_ctx *ctx = data; |
| 206 | struct msgb *msg = ctx->msg; |
Neels Hofmeyr | 59de156 | 2020-07-04 01:49:10 +0200 | [diff] [blame] | 207 | enum reset_msg_type is_reset; |
Neels Hofmeyr | b697274 | 2020-06-26 15:20:51 +0200 | [diff] [blame] | 208 | int supports_osmux; |
Neels Hofmeyr | c4628a3 | 2018-12-07 14:47:34 +0100 | [diff] [blame] | 209 | |
| 210 | switch (event) { |
| 211 | case RAN_PEER_EV_MSG_UP_CL: |
Neels Hofmeyr | 59de156 | 2020-07-04 01:49:10 +0200 | [diff] [blame] | 212 | is_reset = rp->sri->ran->sccp_ran_ops.is_reset_msg(rp->sri, fi, msg, &supports_osmux); |
Neels Hofmeyr | b697274 | 2020-06-26 15:20:51 +0200 | [diff] [blame] | 213 | ran_peer_update_osmux_support(rp, supports_osmux); |
Neels Hofmeyr | 59de156 | 2020-07-04 01:49:10 +0200 | [diff] [blame] | 214 | switch (is_reset) { |
| 215 | case SCCP_RAN_MSG_RESET: |
Neels Hofmeyr | c4628a3 | 2018-12-07 14:47:34 +0100 | [diff] [blame] | 216 | osmo_fsm_inst_dispatch(fi, RAN_PEER_EV_RX_RESET, msg); |
| 217 | return; |
Neels Hofmeyr | 59de156 | 2020-07-04 01:49:10 +0200 | [diff] [blame] | 218 | case SCCP_RAN_MSG_RESET_ACK: |
Neels Hofmeyr | c4628a3 | 2018-12-07 14:47:34 +0100 | [diff] [blame] | 219 | osmo_fsm_inst_dispatch(fi, RAN_PEER_EV_RX_RESET_ACK, msg); |
| 220 | return; |
| 221 | default: |
| 222 | LOG_RAN_PEER(rp, LOGL_ERROR, "Unhandled ConnectionLess message received: %s\n", |
| 223 | rp->sri->ran->sccp_ran_ops.msg_name(rp->sri, msg)); |
| 224 | return; |
| 225 | } |
| 226 | |
| 227 | default: |
| 228 | LOG_RAN_PEER(rp, LOGL_ERROR, "Unhandled event: %s\n", osmo_fsm_event_name(&ran_peer_fsm, event)); |
| 229 | return; |
| 230 | } |
| 231 | } |
| 232 | |
| 233 | void clear_and_disconnect(struct ran_peer *rp, uint32_t conn_id) |
| 234 | { |
| 235 | struct msgb *clear; |
| 236 | struct ran_msg ran_enc_msg = { |
| 237 | .msg_type = RAN_MSG_CLEAR_COMMAND, |
| 238 | .clear_command = { |
| 239 | .gsm0808_cause = GSM0808_CAUSE_EQUIPMENT_FAILURE, |
| 240 | }, |
| 241 | }; |
| 242 | |
| 243 | clear = rp->sri->ran->ran_encode(rp->fi, &ran_enc_msg); |
| 244 | if (!clear |
| 245 | || sccp_ran_down_l2_co(rp->sri, conn_id, clear)) |
| 246 | LOG_RAN_PEER(rp, LOGL_ERROR, "Cannot sent Clear command\n"); |
| 247 | |
| 248 | sccp_ran_disconnect(rp->sri, conn_id, 0); |
| 249 | } |
| 250 | |
| 251 | void ran_peer_st_wait_rx_reset(struct osmo_fsm_inst *fi, uint32_t event, void *data) |
| 252 | { |
| 253 | struct ran_peer *rp = fi->priv; |
| 254 | struct ran_peer_ev_ctx *ctx; |
Pau Espin Pedrol | f9f38b5 | 2019-05-07 11:48:16 +0200 | [diff] [blame] | 255 | struct msgb *msg; |
Neels Hofmeyr | c4628a3 | 2018-12-07 14:47:34 +0100 | [diff] [blame] | 256 | |
| 257 | switch (event) { |
| 258 | |
| 259 | case RAN_PEER_EV_MSG_UP_CO: |
| 260 | case RAN_PEER_EV_MSG_UP_CO_INITIAL: |
| 261 | ctx = data; |
| 262 | OSMO_ASSERT(ctx); |
| 263 | |
| 264 | if (rp->sri->ignore_missing_reset) { |
| 265 | LOG_RAN_PEER(rp, LOGL_ERROR, "Receiving CO message on RAN peer that has not done a proper RESET yet." |
| 266 | " Accepting RAN peer implicitly (legacy compat)\n"); |
| 267 | ran_peer_state_chg(rp, RAN_PEER_ST_READY); |
| 268 | osmo_fsm_inst_dispatch(rp->fi, event, data); |
| 269 | return; |
| 270 | } |
| 271 | |
| 272 | LOG_RAN_PEER(rp, LOGL_ERROR, "Receiving CO message on RAN peer that has not done a proper RESET yet." |
| 273 | " Disconnecting on incoming message, sending RESET to RAN peer.\n"); |
| 274 | /* No valid RESET procedure has happened here yet. Usually, we're expecting the RAN peer (BSC, |
| 275 | * RNC) to first send a RESET message before sending Connection Oriented messages. So if we're |
| 276 | * getting a CO message, likely we've just restarted or something. Send a RESET to the peer. */ |
| 277 | |
| 278 | /* Make sure the MS / UE properly disconnects. */ |
| 279 | clear_and_disconnect(rp, ctx->conn_id); |
| 280 | |
| 281 | ran_peer_reset(rp); |
| 282 | return; |
| 283 | |
| 284 | case RAN_PEER_EV_RX_RESET: |
Pau Espin Pedrol | f9f38b5 | 2019-05-07 11:48:16 +0200 | [diff] [blame] | 285 | msg = (struct msgb*)data; |
| 286 | ran_peer_rx_reset(rp, msg); |
Neels Hofmeyr | c4628a3 | 2018-12-07 14:47:34 +0100 | [diff] [blame] | 287 | return; |
| 288 | |
| 289 | default: |
| 290 | LOG_RAN_PEER(rp, LOGL_ERROR, "Unhandled event: %s\n", osmo_fsm_event_name(&ran_peer_fsm, event)); |
| 291 | return; |
| 292 | } |
| 293 | } |
| 294 | |
| 295 | void ran_peer_st_wait_rx_reset_ack(struct osmo_fsm_inst *fi, uint32_t event, void *data) |
| 296 | { |
| 297 | struct ran_peer *rp = fi->priv; |
| 298 | struct ran_peer_ev_ctx *ctx; |
Pau Espin Pedrol | f9f38b5 | 2019-05-07 11:48:16 +0200 | [diff] [blame] | 299 | struct msgb *msg; |
Neels Hofmeyr | c4628a3 | 2018-12-07 14:47:34 +0100 | [diff] [blame] | 300 | |
| 301 | switch (event) { |
| 302 | |
| 303 | case RAN_PEER_EV_RX_RESET_ACK: |
Pau Espin Pedrol | f9f38b5 | 2019-05-07 11:48:16 +0200 | [diff] [blame] | 304 | msg = (struct msgb*)data; |
| 305 | ran_peer_rx_reset_ack(rp, msg); |
Neels Hofmeyr | c4628a3 | 2018-12-07 14:47:34 +0100 | [diff] [blame] | 306 | return; |
| 307 | |
| 308 | case RAN_PEER_EV_MSG_UP_CO: |
| 309 | case RAN_PEER_EV_MSG_UP_CO_INITIAL: |
| 310 | ctx = data; |
| 311 | OSMO_ASSERT(ctx); |
| 312 | LOG_RAN_PEER(rp, LOGL_ERROR, "Receiving CO message on RAN peer that has not done a proper RESET yet." |
| 313 | " Disconnecting on incoming message, sending RESET to RAN peer.\n"); |
| 314 | sccp_ran_disconnect(rp->sri, ctx->conn_id, 0); |
| 315 | /* No valid RESET procedure has happened here yet. */ |
| 316 | ran_peer_reset(rp); |
| 317 | return; |
| 318 | |
| 319 | case RAN_PEER_EV_RX_RESET: |
Pau Espin Pedrol | f9f38b5 | 2019-05-07 11:48:16 +0200 | [diff] [blame] | 320 | msg = (struct msgb*)data; |
| 321 | ran_peer_rx_reset(rp, msg); |
Neels Hofmeyr | c4628a3 | 2018-12-07 14:47:34 +0100 | [diff] [blame] | 322 | return; |
| 323 | |
| 324 | default: |
| 325 | LOG_RAN_PEER(rp, LOGL_ERROR, "Unhandled event: %s\n", osmo_fsm_event_name(&ran_peer_fsm, event)); |
| 326 | return; |
| 327 | } |
| 328 | } |
| 329 | |
| 330 | static struct ran_conn *new_incoming_conn(struct ran_peer *rp, uint32_t conn_id) |
| 331 | { |
| 332 | struct gsm_network *net = rp->sri->user_data; |
| 333 | struct msub *msub; |
| 334 | struct msc_i *msc_i; |
| 335 | struct msc_a *msc_a; |
| 336 | struct ran_conn *ran_conn; |
| 337 | |
| 338 | msub = msub_alloc(net); |
| 339 | OSMO_ASSERT(msub); |
| 340 | msc_i = msc_i_alloc(msub, rp->sri->ran); |
| 341 | OSMO_ASSERT(msc_i); |
| 342 | |
| 343 | ran_conn = ran_conn_create_incoming(rp, conn_id); |
| 344 | if (!ran_conn) { |
| 345 | LOG_RAN_PEER(rp, LOGL_ERROR, "Cannot allocate ran_conn\n"); |
| 346 | return NULL; |
| 347 | } |
| 348 | msc_i_set_ran_conn(msc_i, ran_conn); |
| 349 | |
| 350 | msc_a = msc_a_alloc(msub, rp->sri->ran); |
| 351 | OSMO_ASSERT(msc_a); |
| 352 | |
| 353 | return msc_i->ran_conn; |
| 354 | } |
| 355 | |
| 356 | void ran_peer_st_ready(struct osmo_fsm_inst *fi, uint32_t event, void *data) |
| 357 | { |
| 358 | struct ran_peer *rp = fi->priv; |
| 359 | struct ran_peer_ev_ctx *ctx; |
| 360 | struct ran_conn *conn; |
| 361 | struct an_apdu an_apdu; |
Pau Espin Pedrol | f9f38b5 | 2019-05-07 11:48:16 +0200 | [diff] [blame] | 362 | struct msgb *msg; |
Neels Hofmeyr | c4628a3 | 2018-12-07 14:47:34 +0100 | [diff] [blame] | 363 | |
| 364 | switch (event) { |
| 365 | |
| 366 | case RAN_PEER_EV_MSG_UP_CO_INITIAL: |
| 367 | ctx = data; |
Vadim Yanitskiy | d14422a | 2019-07-09 00:37:49 +0700 | [diff] [blame] | 368 | OSMO_ASSERT(ctx); |
Neels Hofmeyr | c4628a3 | 2018-12-07 14:47:34 +0100 | [diff] [blame] | 369 | OSMO_ASSERT(!ctx->conn); |
| 370 | OSMO_ASSERT(ctx->msg); |
| 371 | |
| 372 | conn = new_incoming_conn(rp, ctx->conn_id); |
| 373 | if (!conn) |
| 374 | return; |
| 375 | if (!conn->msc_role) { |
| 376 | LOG_RAN_PEER(rp, LOGL_ERROR, |
| 377 | "Rx CO Initial message on conn that is not associated with any MSC role\n"); |
| 378 | return; |
| 379 | } |
| 380 | |
| 381 | |
| 382 | an_apdu = (struct an_apdu){ |
| 383 | .an_proto = rp->sri->ran->an_proto, |
| 384 | .msg = ctx->msg, |
| 385 | }; |
| 386 | |
| 387 | osmo_fsm_inst_dispatch(conn->msc_role, MSC_EV_FROM_RAN_COMPLETE_LAYER_3, &an_apdu); |
| 388 | return; |
| 389 | |
| 390 | case RAN_PEER_EV_MSG_UP_CO: |
| 391 | ctx = data; |
| 392 | OSMO_ASSERT(ctx); |
| 393 | OSMO_ASSERT(ctx->conn); |
| 394 | OSMO_ASSERT(ctx->msg); |
| 395 | |
| 396 | if (!ctx->conn->msc_role) { |
| 397 | LOG_RAN_PEER(rp, LOGL_ERROR, |
| 398 | "Rx CO message on conn that is not associated with any MSC role\n"); |
| 399 | return; |
| 400 | } |
| 401 | |
| 402 | an_apdu = (struct an_apdu){ |
| 403 | .an_proto = rp->sri->ran->an_proto, |
| 404 | .msg = ctx->msg, |
| 405 | }; |
| 406 | |
| 407 | osmo_fsm_inst_dispatch(ctx->conn->msc_role, MSC_EV_FROM_RAN_UP_L2, &an_apdu); |
| 408 | return; |
| 409 | |
| 410 | case RAN_PEER_EV_MSG_DOWN_CO_INITIAL: |
| 411 | ctx = data; |
| 412 | OSMO_ASSERT(ctx); |
| 413 | OSMO_ASSERT(ctx->msg); |
| 414 | sccp_ran_down_l2_co_initial(rp->sri, &rp->peer_addr, ctx->conn_id, ctx->msg); |
| 415 | return; |
| 416 | |
| 417 | case RAN_PEER_EV_MSG_DOWN_CO: |
| 418 | ctx = data; |
| 419 | OSMO_ASSERT(ctx); |
| 420 | OSMO_ASSERT(ctx->msg); |
| 421 | sccp_ran_down_l2_co(rp->sri, ctx->conn_id, ctx->msg); |
| 422 | return; |
| 423 | |
| 424 | case RAN_PEER_EV_MSG_DOWN_CL: |
| 425 | OSMO_ASSERT(data); |
| 426 | sccp_ran_down_l2_cl(rp->sri, &rp->peer_addr, (struct msgb*)data); |
| 427 | return; |
| 428 | |
| 429 | case RAN_PEER_EV_RX_RESET: |
Pau Espin Pedrol | f9f38b5 | 2019-05-07 11:48:16 +0200 | [diff] [blame] | 430 | msg = (struct msgb*)data; |
| 431 | ran_peer_rx_reset(rp, msg); |
Neels Hofmeyr | c4628a3 | 2018-12-07 14:47:34 +0100 | [diff] [blame] | 432 | return; |
| 433 | |
| 434 | default: |
| 435 | LOG_RAN_PEER(rp, LOGL_ERROR, "Unhandled event: %s\n", osmo_fsm_event_name(&ran_peer_fsm, event)); |
| 436 | return; |
| 437 | } |
| 438 | } |
| 439 | |
| 440 | static int ran_peer_fsm_timer_cb(struct osmo_fsm_inst *fi) |
| 441 | { |
| 442 | struct ran_peer *rp = fi->priv; |
| 443 | ran_peer_state_chg(rp, RAN_PEER_ST_WAIT_RX_RESET); |
| 444 | return 0; |
| 445 | } |
| 446 | |
| 447 | void ran_peer_fsm_cleanup(struct osmo_fsm_inst *fi, enum osmo_fsm_term_cause cause) |
| 448 | { |
| 449 | struct ran_peer *rp = fi->priv; |
| 450 | ran_peer_discard_all_conns(rp); |
| 451 | llist_del(&rp->entry); |
| 452 | } |
| 453 | |
| 454 | static const struct value_string ran_peer_fsm_event_names[] = { |
| 455 | OSMO_VALUE_STRING(RAN_PEER_EV_MSG_UP_CL), |
| 456 | OSMO_VALUE_STRING(RAN_PEER_EV_MSG_UP_CO_INITIAL), |
| 457 | OSMO_VALUE_STRING(RAN_PEER_EV_MSG_UP_CO), |
| 458 | OSMO_VALUE_STRING(RAN_PEER_EV_MSG_DOWN_CL), |
| 459 | OSMO_VALUE_STRING(RAN_PEER_EV_MSG_DOWN_CO_INITIAL), |
| 460 | OSMO_VALUE_STRING(RAN_PEER_EV_MSG_DOWN_CO), |
| 461 | OSMO_VALUE_STRING(RAN_PEER_EV_RX_RESET), |
| 462 | OSMO_VALUE_STRING(RAN_PEER_EV_RX_RESET_ACK), |
| 463 | OSMO_VALUE_STRING(RAN_PEER_EV_CONNECTION_SUCCESS), |
| 464 | OSMO_VALUE_STRING(RAN_PEER_EV_CONNECTION_TIMEOUT), |
| 465 | {} |
| 466 | }; |
| 467 | |
| 468 | #define S(x) (1 << (x)) |
| 469 | |
| 470 | static const struct osmo_fsm_state ran_peer_fsm_states[] = { |
| 471 | [RAN_PEER_ST_WAIT_RX_RESET] = { |
| 472 | .name = "WAIT_RX_RESET", |
| 473 | .action = ran_peer_st_wait_rx_reset, |
| 474 | .in_event_mask = 0 |
| 475 | | S(RAN_PEER_EV_RX_RESET) |
| 476 | | S(RAN_PEER_EV_MSG_UP_CO_INITIAL) |
| 477 | | S(RAN_PEER_EV_MSG_UP_CO) |
| 478 | | S(RAN_PEER_EV_CONNECTION_TIMEOUT) |
| 479 | , |
| 480 | .out_state_mask = 0 |
| 481 | | S(RAN_PEER_ST_WAIT_RX_RESET) |
| 482 | | S(RAN_PEER_ST_WAIT_RX_RESET_ACK) |
| 483 | | S(RAN_PEER_ST_READY) |
| 484 | | S(RAN_PEER_ST_DISCARDING) |
| 485 | , |
| 486 | }, |
| 487 | [RAN_PEER_ST_WAIT_RX_RESET_ACK] = { |
| 488 | .name = "WAIT_RX_RESET_ACK", |
| 489 | .action = ran_peer_st_wait_rx_reset_ack, |
| 490 | .in_event_mask = 0 |
| 491 | | S(RAN_PEER_EV_RX_RESET) |
| 492 | | S(RAN_PEER_EV_RX_RESET_ACK) |
| 493 | | S(RAN_PEER_EV_MSG_UP_CO_INITIAL) |
| 494 | | S(RAN_PEER_EV_MSG_UP_CO) |
| 495 | | S(RAN_PEER_EV_CONNECTION_TIMEOUT) |
| 496 | , |
| 497 | .out_state_mask = 0 |
| 498 | | S(RAN_PEER_ST_WAIT_RX_RESET) |
| 499 | | S(RAN_PEER_ST_WAIT_RX_RESET_ACK) |
| 500 | | S(RAN_PEER_ST_READY) |
| 501 | | S(RAN_PEER_ST_DISCARDING) |
| 502 | , |
| 503 | }, |
| 504 | [RAN_PEER_ST_READY] = { |
| 505 | .name = "READY", |
| 506 | .action = ran_peer_st_ready, |
| 507 | .in_event_mask = 0 |
| 508 | | S(RAN_PEER_EV_RX_RESET) |
| 509 | | S(RAN_PEER_EV_MSG_UP_CO_INITIAL) |
| 510 | | S(RAN_PEER_EV_MSG_UP_CO) |
| 511 | | S(RAN_PEER_EV_MSG_DOWN_CO_INITIAL) |
| 512 | | S(RAN_PEER_EV_MSG_DOWN_CO) |
| 513 | | S(RAN_PEER_EV_MSG_DOWN_CL) |
| 514 | , |
| 515 | .out_state_mask = 0 |
| 516 | | S(RAN_PEER_ST_WAIT_RX_RESET) |
| 517 | | S(RAN_PEER_ST_WAIT_RX_RESET_ACK) |
| 518 | | S(RAN_PEER_ST_READY) |
| 519 | | S(RAN_PEER_ST_DISCARDING) |
| 520 | , |
| 521 | }, |
| 522 | [RAN_PEER_ST_DISCARDING] = { |
| 523 | .name = "DISCARDING", |
| 524 | }, |
| 525 | }; |
| 526 | |
| 527 | static struct osmo_fsm ran_peer_fsm = { |
| 528 | .name = "ran_peer", |
| 529 | .states = ran_peer_fsm_states, |
| 530 | .num_states = ARRAY_SIZE(ran_peer_fsm_states), |
| 531 | .log_subsys = DRR, |
| 532 | .event_names = ran_peer_fsm_event_names, |
| 533 | .timer_cb = ran_peer_fsm_timer_cb, |
| 534 | .cleanup = ran_peer_fsm_cleanup, |
| 535 | .allstate_action = ran_peer_allstate_action, |
| 536 | .allstate_event_mask = 0 |
| 537 | | S(RAN_PEER_EV_MSG_UP_CL) |
| 538 | , |
| 539 | }; |
| 540 | |
| 541 | int ran_peer_up_l2(struct sccp_ran_inst *sri, const struct osmo_sccp_addr *calling_addr, bool co, uint32_t conn_id, |
| 542 | struct msgb *l2) |
| 543 | { |
| 544 | struct ran_peer *ran_peer = NULL; |
| 545 | uint32_t event; |
| 546 | struct ran_peer_ev_ctx ctx = { |
| 547 | .conn_id = conn_id, |
| 548 | .msg = l2, |
| 549 | }; |
| 550 | |
| 551 | if (co) { |
| 552 | struct ran_conn *conn; |
| 553 | llist_for_each_entry(conn, &sri->ran_conns, entry) { |
| 554 | if (conn->sccp_conn_id == conn_id) { |
| 555 | ran_peer = conn->ran_peer; |
| 556 | ctx.conn = conn; |
| 557 | break; |
| 558 | } |
| 559 | } |
| 560 | |
| 561 | if (ran_peer && calling_addr) { |
| 562 | LOG_SCCP_RAN_CO(sri, calling_addr, conn_id, LOGL_ERROR, |
| 563 | "Connection-Oriented Initial message for already existing conn_id." |
| 564 | " Dropping message.\n"); |
| 565 | return -EINVAL; |
| 566 | } |
| 567 | |
| 568 | if (!ran_peer && !calling_addr) { |
| 569 | LOG_SCCP_RAN_CO(sri, calling_addr, conn_id, LOGL_ERROR, |
| 570 | "Connection-Oriented non-Initial message for unknown conn_id %u." |
| 571 | " Dropping message.\n", conn_id); |
| 572 | return -EINVAL; |
| 573 | } |
| 574 | } |
| 575 | |
| 576 | if (calling_addr) { |
| 577 | ran_peer = ran_peer_find_or_create(sri, calling_addr); |
| 578 | if (!ran_peer) { |
| 579 | LOG_SCCP_RAN_CL(sri, calling_addr, LOGL_ERROR, "Cannot register RAN peer\n"); |
| 580 | return -EIO; |
| 581 | } |
| 582 | } |
| 583 | |
| 584 | OSMO_ASSERT(ran_peer && ran_peer->fi); |
| 585 | |
| 586 | if (co) |
| 587 | event = calling_addr ? RAN_PEER_EV_MSG_UP_CO_INITIAL : RAN_PEER_EV_MSG_UP_CO; |
| 588 | else |
| 589 | event = RAN_PEER_EV_MSG_UP_CL; |
| 590 | |
| 591 | return osmo_fsm_inst_dispatch(ran_peer->fi, event, &ctx); |
| 592 | } |
| 593 | |
| 594 | void ran_peer_disconnect(struct sccp_ran_inst *sri, uint32_t conn_id) |
| 595 | { |
| 596 | struct ran_conn *conn; |
| 597 | llist_for_each_entry(conn, &sri->ran_conns, entry) { |
| 598 | if (conn->sccp_conn_id == conn_id) { |
| 599 | ran_conn_discard(conn); |
| 600 | return; |
| 601 | } |
| 602 | } |
| 603 | } |
| 604 | |
| 605 | struct ran_peer *ran_peer_find_by_cell_id(struct sccp_ran_inst *sri, const struct gsm0808_cell_id *cid, |
| 606 | bool expecting_single_match) |
| 607 | { |
| 608 | struct ran_peer *rp; |
| 609 | struct ran_peer *found = NULL; |
| 610 | |
| 611 | llist_for_each_entry(rp, &sri->ran_peers, entry) { |
| 612 | if (cell_id_list_find(&rp->cells_seen, cid, 0, false)) { |
| 613 | if (!expecting_single_match) |
| 614 | return rp; |
| 615 | /* Otherwise continue iterating and log errors for multiple matches... */ |
| 616 | if (found) { |
| 617 | LOG_RAN_PEER(found, LOGL_ERROR, "Cell appears in more than one RAN peer:" |
| 618 | " %s also appears in %s\n", |
| 619 | gsm0808_cell_id_name(cid), rp->fi->id); |
| 620 | } else |
| 621 | found = rp; |
| 622 | } |
| 623 | } |
| 624 | return found; |
| 625 | } |
| 626 | |
Neels Hofmeyr | c4628a3 | 2018-12-07 14:47:34 +0100 | [diff] [blame] | 627 | int ran_peers_down_paging(struct sccp_ran_inst *sri, enum CELL_IDENT page_where, struct vlr_subscr *vsub, |
| 628 | enum paging_cause cause) |
| 629 | { |
| 630 | struct ran_peer *rp; |
| 631 | int ret = 0; |
| 632 | struct gsm0808_cell_id page_id; |
| 633 | gsm0808_cell_id_from_cgi(&page_id, page_where, &vsub->cgi); |
| 634 | |
| 635 | switch (page_where) { |
| 636 | case CELL_IDENT_NO_CELL: |
Martin Hauke | 3f07dac | 2019-11-14 17:49:08 +0100 | [diff] [blame] | 637 | LOG_SCCP_RAN_CAT(sri, DPAG, LOGL_ERROR, "Asked to page on NO_CELL, which doesn't make sense.\n"); |
Neels Hofmeyr | c4628a3 | 2018-12-07 14:47:34 +0100 | [diff] [blame] | 638 | return 0; |
| 639 | |
| 640 | case CELL_IDENT_UTRAN_PLMN_LAC_RNC: |
| 641 | case CELL_IDENT_UTRAN_RNC: |
| 642 | case CELL_IDENT_UTRAN_LAC_RNC: |
| 643 | LOG_SCCP_RAN_CAT(sri, DPAG, LOGL_ERROR, "Don't know how to page on %s\n", |
| 644 | gsm0808_cell_id_name(&page_id)); |
| 645 | return 0; |
| 646 | |
| 647 | default: |
| 648 | break; |
| 649 | }; |
| 650 | |
| 651 | llist_for_each_entry(rp, &sri->ran_peers, entry) { |
| 652 | ret += ran_peer_down_paging(rp, &page_id, vsub, cause); |
| 653 | } |
| 654 | |
| 655 | if (!ret) |
| 656 | LOG_SCCP_RAN_CAT(sri, DPAG, LOGL_ERROR, "Paging failed, no RAN peers found for %s\n", |
| 657 | gsm0808_cell_id_name(&page_id)); |
| 658 | return ret; |
| 659 | } |
| 660 | |
| 661 | /* If the given vsub->cgi matches this ran_peer with respect to page_where, page and return 1. |
| 662 | * Otherwise return 0. (Return value: number of pagings sent) */ |
| 663 | int ran_peer_down_paging(struct ran_peer *rp, const struct gsm0808_cell_id *page_id, struct vlr_subscr *vsub, |
| 664 | enum paging_cause cause) |
| 665 | { |
| 666 | struct msgb *l2; |
| 667 | |
Neels Hofmeyr | c4628a3 | 2018-12-07 14:47:34 +0100 | [diff] [blame] | 668 | /* There are also the RAN peers that are configured in the neighbor ident for Handover, but if those aren't |
| 669 | * connected, then we can't Page there. */ |
Vadim Yanitskiy | d24c46a | 2019-05-14 21:49:47 +0700 | [diff] [blame] | 670 | if (!cell_id_list_find(&rp->cells_seen, page_id, 0, false)) |
| 671 | return 0; |
Neels Hofmeyr | c4628a3 | 2018-12-07 14:47:34 +0100 | [diff] [blame] | 672 | |
Neels Hofmeyr | c4628a3 | 2018-12-07 14:47:34 +0100 | [diff] [blame] | 673 | LOG_RAN_PEER_CAT(rp, DPAG, LOGL_DEBUG, "Paging for %s on %s\n", vlr_subscr_name(vsub), |
| 674 | gsm0808_cell_id_name(page_id)); |
| 675 | l2 = rp->sri->ran->sccp_ran_ops.make_paging_msg(rp->sri, page_id, vsub->imsi, vsub->tmsi, cause); |
| 676 | if (osmo_fsm_inst_dispatch(rp->fi, RAN_PEER_EV_MSG_DOWN_CL, l2)) { |
| 677 | /* Not allowed to send messages, the peer is not properly connected yet/anymore */ |
| 678 | LOG_RAN_PEER_CAT(rp, DPAG, LOGL_ERROR, |
| 679 | "Paging for %s matched this RAN peer, but emitting a Paging failed\n", |
| 680 | gsm0808_cell_id_name(page_id)); |
Vadim Yanitskiy | ede95d1 | 2019-05-14 21:41:06 +0700 | [diff] [blame] | 681 | msgb_free(l2); |
Neels Hofmeyr | c4628a3 | 2018-12-07 14:47:34 +0100 | [diff] [blame] | 682 | return 0; |
| 683 | } |
Vadim Yanitskiy | ede95d1 | 2019-05-14 21:41:06 +0700 | [diff] [blame] | 684 | |
| 685 | /* The RAN_PEER_EV_MSG_DOWN_CL handler calls sccp_ran_down_l2_cl(), |
| 686 | * which doesn't free msgb. We have to do this ourselves. */ |
| 687 | msgb_free(l2); |
| 688 | |
Neels Hofmeyr | c4628a3 | 2018-12-07 14:47:34 +0100 | [diff] [blame] | 689 | return 1; |
| 690 | } |